2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "glsl_symbol_table.h"
53 #include "glsl_parser_extras.h"
55 #include "compiler/glsl_types.h"
56 #include "program/hash_table.h"
57 #include "main/macros.h"
58 #include "main/shaderobj.h"
60 #include "ir_builder.h"
62 using namespace ir_builder
;
65 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
66 exec_list
*instructions
);
68 remove_per_vertex_blocks(exec_list
*instructions
,
69 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
72 * Visitor class that finds the first instance of any write-only variable that
73 * is ever read, if any
75 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
78 read_from_write_only_variable_visitor() : found(NULL
)
82 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
84 if (this->in_assignee
)
85 return visit_continue
;
87 ir_variable
*var
= ir
->variable_referenced();
88 /* We can have image_write_only set on both images and buffer variables,
89 * but in the former there is a distinction between reads from
90 * the variable itself (write_only) and from the memory they point to
91 * (image_write_only), while in the case of buffer variables there is
92 * no such distinction, that is why this check here is limited to
93 * buffer variables alone.
95 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
96 return visit_continue
;
98 if (var
->data
.image_write_only
) {
103 return visit_continue
;
106 ir_variable
*get_variable() {
110 virtual ir_visitor_status
visit_enter(ir_expression
*ir
)
112 /* .length() doesn't actually read anything */
113 if (ir
->operation
== ir_unop_ssbo_unsized_array_length
)
114 return visit_continue_with_parent
;
116 return visit_continue
;
124 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
126 _mesa_glsl_initialize_variables(instructions
, state
);
128 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
130 state
->current_function
= NULL
;
132 state
->toplevel_ir
= instructions
;
134 state
->gs_input_prim_type_specified
= false;
135 state
->tcs_output_vertices_specified
= false;
136 state
->cs_input_local_size_specified
= false;
138 /* Section 4.2 of the GLSL 1.20 specification states:
139 * "The built-in functions are scoped in a scope outside the global scope
140 * users declare global variables in. That is, a shader's global scope,
141 * available for user-defined functions and global variables, is nested
142 * inside the scope containing the built-in functions."
144 * Since built-in functions like ftransform() access built-in variables,
145 * it follows that those must be in the outer scope as well.
147 * We push scope here to create this nesting effect...but don't pop.
148 * This way, a shader's globals are still in the symbol table for use
151 state
->symbols
->push_scope();
153 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
154 ast
->hir(instructions
, state
);
156 detect_recursion_unlinked(state
, instructions
);
157 detect_conflicting_assignments(state
, instructions
);
159 state
->toplevel_ir
= NULL
;
161 /* Move all of the variable declarations to the front of the IR list, and
162 * reverse the order. This has the (intended!) side effect that vertex
163 * shader inputs and fragment shader outputs will appear in the IR in the
164 * same order that they appeared in the shader code. This results in the
165 * locations being assigned in the declared order. Many (arguably buggy)
166 * applications depend on this behavior, and it matches what nearly all
169 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
170 ir_variable
*const var
= node
->as_variable();
176 instructions
->push_head(var
);
179 /* Figure out if gl_FragCoord is actually used in fragment shader */
180 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
182 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
184 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
186 * If multiple shaders using members of a built-in block belonging to
187 * the same interface are linked together in the same program, they
188 * must all redeclare the built-in block in the same way, as described
189 * in section 4.3.7 "Interface Blocks" for interface block matching, or
190 * a link error will result.
192 * The phrase "using members of a built-in block" implies that if two
193 * shaders are linked together and one of them *does not use* any members
194 * of the built-in block, then that shader does not need to have a matching
195 * redeclaration of the built-in block.
197 * This appears to be a clarification to the behaviour established for
198 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
201 * The definition of "interface" in section 4.3.7 that applies here is as
204 * The boundary between adjacent programmable pipeline stages: This
205 * spans all the outputs in all compilation units of the first stage
206 * and all the inputs in all compilation units of the second stage.
208 * Therefore this rule applies to both inter- and intra-stage linking.
210 * The easiest way to implement this is to check whether the shader uses
211 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
212 * remove all the relevant variable declaration from the IR, so that the
213 * linker won't see them and complain about mismatches.
215 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
216 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
218 /* Check that we don't have reads from write-only variables */
219 read_from_write_only_variable_visitor v
;
221 ir_variable
*error_var
= v
.get_variable();
223 /* It would be nice to have proper location information, but for that
224 * we would need to check this as we process each kind of AST node
227 memset(&loc
, 0, sizeof(loc
));
228 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
234 static ir_expression_operation
235 get_implicit_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
236 struct _mesa_glsl_parse_state
*state
)
238 switch (to
->base_type
) {
239 case GLSL_TYPE_FLOAT
:
240 switch (from
->base_type
) {
241 case GLSL_TYPE_INT
: return ir_unop_i2f
;
242 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
243 default: return (ir_expression_operation
)0;
247 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
248 && !state
->MESA_shader_integer_functions_enable
)
249 return (ir_expression_operation
)0;
250 switch (from
->base_type
) {
251 case GLSL_TYPE_INT
: return ir_unop_i2u
;
252 default: return (ir_expression_operation
)0;
255 case GLSL_TYPE_DOUBLE
:
256 if (!state
->has_double())
257 return (ir_expression_operation
)0;
258 switch (from
->base_type
) {
259 case GLSL_TYPE_INT
: return ir_unop_i2d
;
260 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
261 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
262 default: return (ir_expression_operation
)0;
265 default: return (ir_expression_operation
)0;
271 * If a conversion is available, convert one operand to a different type
273 * The \c from \c ir_rvalue is converted "in place".
275 * \param to Type that the operand it to be converted to
276 * \param from Operand that is being converted
277 * \param state GLSL compiler state
280 * If a conversion is possible (or unnecessary), \c true is returned.
281 * Otherwise \c false is returned.
284 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
285 struct _mesa_glsl_parse_state
*state
)
288 if (to
->base_type
== from
->type
->base_type
)
291 /* Prior to GLSL 1.20, there are no implicit conversions */
292 if (!state
->is_version(120, 0))
295 /* ESSL does not allow implicit conversions */
296 if (state
->es_shader
)
299 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
301 * "There are no implicit array or structure conversions. For
302 * example, an array of int cannot be implicitly converted to an
305 if (!to
->is_numeric() || !from
->type
->is_numeric())
308 /* We don't actually want the specific type `to`, we want a type
309 * with the same base type as `to`, but the same vector width as
312 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
313 from
->type
->matrix_columns
);
315 ir_expression_operation op
= get_implicit_conversion_operation(to
, from
->type
, state
);
317 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
325 static const struct glsl_type
*
326 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
328 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
330 const glsl_type
*type_a
= value_a
->type
;
331 const glsl_type
*type_b
= value_b
->type
;
333 /* From GLSL 1.50 spec, page 56:
335 * "The arithmetic binary operators add (+), subtract (-),
336 * multiply (*), and divide (/) operate on integer and
337 * floating-point scalars, vectors, and matrices."
339 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
340 _mesa_glsl_error(loc
, state
,
341 "operands to arithmetic operators must be numeric");
342 return glsl_type::error_type
;
346 /* "If one operand is floating-point based and the other is
347 * not, then the conversions from Section 4.1.10 "Implicit
348 * Conversions" are applied to the non-floating-point-based operand."
350 if (!apply_implicit_conversion(type_a
, value_b
, state
)
351 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
352 _mesa_glsl_error(loc
, state
,
353 "could not implicitly convert operands to "
354 "arithmetic operator");
355 return glsl_type::error_type
;
357 type_a
= value_a
->type
;
358 type_b
= value_b
->type
;
360 /* "If the operands are integer types, they must both be signed or
363 * From this rule and the preceeding conversion it can be inferred that
364 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
365 * The is_numeric check above already filtered out the case where either
366 * type is not one of these, so now the base types need only be tested for
369 if (type_a
->base_type
!= type_b
->base_type
) {
370 _mesa_glsl_error(loc
, state
,
371 "base type mismatch for arithmetic operator");
372 return glsl_type::error_type
;
375 /* "All arithmetic binary operators result in the same fundamental type
376 * (signed integer, unsigned integer, or floating-point) as the
377 * operands they operate on, after operand type conversion. After
378 * conversion, the following cases are valid
380 * * The two operands are scalars. In this case the operation is
381 * applied, resulting in a scalar."
383 if (type_a
->is_scalar() && type_b
->is_scalar())
386 /* "* One operand is a scalar, and the other is a vector or matrix.
387 * In this case, the scalar operation is applied independently to each
388 * component of the vector or matrix, resulting in the same size
391 if (type_a
->is_scalar()) {
392 if (!type_b
->is_scalar())
394 } else if (type_b
->is_scalar()) {
398 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
399 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
402 assert(!type_a
->is_scalar());
403 assert(!type_b
->is_scalar());
405 /* "* The two operands are vectors of the same size. In this case, the
406 * operation is done component-wise resulting in the same size
409 if (type_a
->is_vector() && type_b
->is_vector()) {
410 if (type_a
== type_b
) {
413 _mesa_glsl_error(loc
, state
,
414 "vector size mismatch for arithmetic operator");
415 return glsl_type::error_type
;
419 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
420 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
421 * <vector, vector> have been handled. At least one of the operands must
422 * be matrix. Further, since there are no integer matrix types, the base
423 * type of both operands must be float.
425 assert(type_a
->is_matrix() || type_b
->is_matrix());
426 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
||
427 type_a
->base_type
== GLSL_TYPE_DOUBLE
);
428 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
||
429 type_b
->base_type
== GLSL_TYPE_DOUBLE
);
431 /* "* The operator is add (+), subtract (-), or divide (/), and the
432 * operands are matrices with the same number of rows and the same
433 * number of columns. In this case, the operation is done component-
434 * wise resulting in the same size matrix."
435 * * The operator is multiply (*), where both operands are matrices or
436 * one operand is a vector and the other a matrix. A right vector
437 * operand is treated as a column vector and a left vector operand as a
438 * row vector. In all these cases, it is required that the number of
439 * columns of the left operand is equal to the number of rows of the
440 * right operand. Then, the multiply (*) operation does a linear
441 * algebraic multiply, yielding an object that has the same number of
442 * rows as the left operand and the same number of columns as the right
443 * operand. Section 5.10 "Vector and Matrix Operations" explains in
444 * more detail how vectors and matrices are operated on."
447 if (type_a
== type_b
)
450 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
452 if (type
== glsl_type::error_type
) {
453 _mesa_glsl_error(loc
, state
,
454 "size mismatch for matrix multiplication");
461 /* "All other cases are illegal."
463 _mesa_glsl_error(loc
, state
, "type mismatch");
464 return glsl_type::error_type
;
468 static const struct glsl_type
*
469 unary_arithmetic_result_type(const struct glsl_type
*type
,
470 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
472 /* From GLSL 1.50 spec, page 57:
474 * "The arithmetic unary operators negate (-), post- and pre-increment
475 * and decrement (-- and ++) operate on integer or floating-point
476 * values (including vectors and matrices). All unary operators work
477 * component-wise on their operands. These result with the same type
480 if (!type
->is_numeric()) {
481 _mesa_glsl_error(loc
, state
,
482 "operands to arithmetic operators must be numeric");
483 return glsl_type::error_type
;
490 * \brief Return the result type of a bit-logic operation.
492 * If the given types to the bit-logic operator are invalid, return
493 * glsl_type::error_type.
495 * \param value_a LHS of bit-logic op
496 * \param value_b RHS of bit-logic op
498 static const struct glsl_type
*
499 bit_logic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
501 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
503 const glsl_type
*type_a
= value_a
->type
;
504 const glsl_type
*type_b
= value_b
->type
;
506 if (!state
->check_bitwise_operations_allowed(loc
)) {
507 return glsl_type::error_type
;
510 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
512 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
513 * (|). The operands must be of type signed or unsigned integers or
516 if (!type_a
->is_integer()) {
517 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
518 ast_expression::operator_string(op
));
519 return glsl_type::error_type
;
521 if (!type_b
->is_integer()) {
522 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
523 ast_expression::operator_string(op
));
524 return glsl_type::error_type
;
527 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
528 * make sense for bitwise operations, as they don't operate on floats.
530 * GLSL 4.0 added implicit int -> uint conversions, which are relevant
531 * here. It wasn't clear whether or not we should apply them to bitwise
532 * operations. However, Khronos has decided that they should in future
533 * language revisions. Applications also rely on this behavior. We opt
534 * to apply them in general, but issue a portability warning.
536 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
538 if (type_a
->base_type
!= type_b
->base_type
) {
539 if (!apply_implicit_conversion(type_a
, value_b
, state
)
540 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
541 _mesa_glsl_error(loc
, state
,
542 "could not implicitly convert operands to "
544 ast_expression::operator_string(op
));
545 return glsl_type::error_type
;
547 _mesa_glsl_warning(loc
, state
,
548 "some implementations may not support implicit "
549 "int -> uint conversions for `%s' operators; "
550 "consider casting explicitly for portability",
551 ast_expression::operator_string(op
));
553 type_a
= value_a
->type
;
554 type_b
= value_b
->type
;
557 /* "The fundamental types of the operands (signed or unsigned) must
560 if (type_a
->base_type
!= type_b
->base_type
) {
561 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
562 "base type", ast_expression::operator_string(op
));
563 return glsl_type::error_type
;
566 /* "The operands cannot be vectors of differing size." */
567 if (type_a
->is_vector() &&
568 type_b
->is_vector() &&
569 type_a
->vector_elements
!= type_b
->vector_elements
) {
570 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
571 "different sizes", ast_expression::operator_string(op
));
572 return glsl_type::error_type
;
575 /* "If one operand is a scalar and the other a vector, the scalar is
576 * applied component-wise to the vector, resulting in the same type as
577 * the vector. The fundamental types of the operands [...] will be the
578 * resulting fundamental type."
580 if (type_a
->is_scalar())
586 static const struct glsl_type
*
587 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
588 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
590 const glsl_type
*type_a
= value_a
->type
;
591 const glsl_type
*type_b
= value_b
->type
;
593 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
594 return glsl_type::error_type
;
597 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
599 * "The operator modulus (%) operates on signed or unsigned integers or
602 if (!type_a
->is_integer()) {
603 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
604 return glsl_type::error_type
;
606 if (!type_b
->is_integer()) {
607 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
608 return glsl_type::error_type
;
611 /* "If the fundamental types in the operands do not match, then the
612 * conversions from section 4.1.10 "Implicit Conversions" are applied
613 * to create matching types."
615 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
616 * int -> uint conversion rules. Prior to that, there were no implicit
617 * conversions. So it's harmless to apply them universally - no implicit
618 * conversions will exist. If the types don't match, we'll receive false,
619 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
621 * "The operand types must both be signed or unsigned."
623 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
624 !apply_implicit_conversion(type_b
, value_a
, state
)) {
625 _mesa_glsl_error(loc
, state
,
626 "could not implicitly convert operands to "
627 "modulus (%%) operator");
628 return glsl_type::error_type
;
630 type_a
= value_a
->type
;
631 type_b
= value_b
->type
;
633 /* "The operands cannot be vectors of differing size. If one operand is
634 * a scalar and the other vector, then the scalar is applied component-
635 * wise to the vector, resulting in the same type as the vector. If both
636 * are vectors of the same size, the result is computed component-wise."
638 if (type_a
->is_vector()) {
639 if (!type_b
->is_vector()
640 || (type_a
->vector_elements
== type_b
->vector_elements
))
645 /* "The operator modulus (%) is not defined for any other data types
646 * (non-integer types)."
648 _mesa_glsl_error(loc
, state
, "type mismatch");
649 return glsl_type::error_type
;
653 static const struct glsl_type
*
654 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
655 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
657 const glsl_type
*type_a
= value_a
->type
;
658 const glsl_type
*type_b
= value_b
->type
;
660 /* From GLSL 1.50 spec, page 56:
661 * "The relational operators greater than (>), less than (<), greater
662 * than or equal (>=), and less than or equal (<=) operate only on
663 * scalar integer and scalar floating-point expressions."
665 if (!type_a
->is_numeric()
666 || !type_b
->is_numeric()
667 || !type_a
->is_scalar()
668 || !type_b
->is_scalar()) {
669 _mesa_glsl_error(loc
, state
,
670 "operands to relational operators must be scalar and "
672 return glsl_type::error_type
;
675 /* "Either the operands' types must match, or the conversions from
676 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
677 * operand, after which the types must match."
679 if (!apply_implicit_conversion(type_a
, value_b
, state
)
680 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
681 _mesa_glsl_error(loc
, state
,
682 "could not implicitly convert operands to "
683 "relational operator");
684 return glsl_type::error_type
;
686 type_a
= value_a
->type
;
687 type_b
= value_b
->type
;
689 if (type_a
->base_type
!= type_b
->base_type
) {
690 _mesa_glsl_error(loc
, state
, "base type mismatch");
691 return glsl_type::error_type
;
694 /* "The result is scalar Boolean."
696 return glsl_type::bool_type
;
700 * \brief Return the result type of a bit-shift operation.
702 * If the given types to the bit-shift operator are invalid, return
703 * glsl_type::error_type.
705 * \param type_a Type of LHS of bit-shift op
706 * \param type_b Type of RHS of bit-shift op
708 static const struct glsl_type
*
709 shift_result_type(const struct glsl_type
*type_a
,
710 const struct glsl_type
*type_b
,
712 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
714 if (!state
->check_bitwise_operations_allowed(loc
)) {
715 return glsl_type::error_type
;
718 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
720 * "The shift operators (<<) and (>>). For both operators, the operands
721 * must be signed or unsigned integers or integer vectors. One operand
722 * can be signed while the other is unsigned."
724 if (!type_a
->is_integer()) {
725 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
726 "integer vector", ast_expression::operator_string(op
));
727 return glsl_type::error_type
;
730 if (!type_b
->is_integer()) {
731 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
732 "integer vector", ast_expression::operator_string(op
));
733 return glsl_type::error_type
;
736 /* "If the first operand is a scalar, the second operand has to be
739 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
740 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
741 "second must be scalar as well",
742 ast_expression::operator_string(op
));
743 return glsl_type::error_type
;
746 /* If both operands are vectors, check that they have same number of
749 if (type_a
->is_vector() &&
750 type_b
->is_vector() &&
751 type_a
->vector_elements
!= type_b
->vector_elements
) {
752 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
753 "have same number of elements",
754 ast_expression::operator_string(op
));
755 return glsl_type::error_type
;
758 /* "In all cases, the resulting type will be the same type as the left
765 * Returns the innermost array index expression in an rvalue tree.
766 * This is the largest indexing level -- if an array of blocks, then
767 * it is the block index rather than an indexing expression for an
768 * array-typed member of an array of blocks.
771 find_innermost_array_index(ir_rvalue
*rv
)
773 ir_dereference_array
*last
= NULL
;
775 if (rv
->as_dereference_array()) {
776 last
= rv
->as_dereference_array();
778 } else if (rv
->as_dereference_record())
779 rv
= rv
->as_dereference_record()->record
;
780 else if (rv
->as_swizzle())
781 rv
= rv
->as_swizzle()->val
;
787 return last
->array_index
;
793 * Validates that a value can be assigned to a location with a specified type
795 * Validates that \c rhs can be assigned to some location. If the types are
796 * not an exact match but an automatic conversion is possible, \c rhs will be
800 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
801 * Otherwise the actual RHS to be assigned will be returned. This may be
802 * \c rhs, or it may be \c rhs after some type conversion.
805 * In addition to being used for assignments, this function is used to
806 * type-check return values.
809 validate_assignment(struct _mesa_glsl_parse_state
*state
,
810 YYLTYPE loc
, ir_rvalue
*lhs
,
811 ir_rvalue
*rhs
, bool is_initializer
)
813 /* If there is already some error in the RHS, just return it. Anything
814 * else will lead to an avalanche of error message back to the user.
816 if (rhs
->type
->is_error())
819 /* In the Tessellation Control Shader:
820 * If a per-vertex output variable is used as an l-value, it is an error
821 * if the expression indicating the vertex number is not the identifier
824 if (state
->stage
== MESA_SHADER_TESS_CTRL
&& !lhs
->type
->is_error()) {
825 ir_variable
*var
= lhs
->variable_referenced();
826 if (var
&& var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
827 ir_rvalue
*index
= find_innermost_array_index(lhs
);
828 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
829 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
830 _mesa_glsl_error(&loc
, state
,
831 "Tessellation control shader outputs can only "
832 "be indexed by gl_InvocationID");
838 /* If the types are identical, the assignment can trivially proceed.
840 if (rhs
->type
== lhs
->type
)
843 /* If the array element types are the same and the LHS is unsized,
844 * the assignment is okay for initializers embedded in variable
847 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
848 * is handled by ir_dereference::is_lvalue.
850 const glsl_type
*lhs_t
= lhs
->type
;
851 const glsl_type
*rhs_t
= rhs
->type
;
852 bool unsized_array
= false;
853 while(lhs_t
->is_array()) {
855 break; /* the rest of the inner arrays match so break out early */
856 if (!rhs_t
->is_array()) {
857 unsized_array
= false;
858 break; /* number of dimensions mismatch */
860 if (lhs_t
->length
== rhs_t
->length
) {
861 lhs_t
= lhs_t
->fields
.array
;
862 rhs_t
= rhs_t
->fields
.array
;
864 } else if (lhs_t
->is_unsized_array()) {
865 unsized_array
= true;
867 unsized_array
= false;
868 break; /* sized array mismatch */
870 lhs_t
= lhs_t
->fields
.array
;
871 rhs_t
= rhs_t
->fields
.array
;
874 if (is_initializer
) {
877 _mesa_glsl_error(&loc
, state
,
878 "implicitly sized arrays cannot be assigned");
883 /* Check for implicit conversion in GLSL 1.20 */
884 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
885 if (rhs
->type
== lhs
->type
)
889 _mesa_glsl_error(&loc
, state
,
890 "%s of type %s cannot be assigned to "
891 "variable of type %s",
892 is_initializer
? "initializer" : "value",
893 rhs
->type
->name
, lhs
->type
->name
);
899 mark_whole_array_access(ir_rvalue
*access
)
901 ir_dereference_variable
*deref
= access
->as_dereference_variable();
903 if (deref
&& deref
->var
) {
904 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
909 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
910 const char *non_lvalue_description
,
911 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
912 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
917 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
919 ir_variable
*lhs_var
= lhs
->variable_referenced();
921 lhs_var
->data
.assigned
= true;
923 if (!error_emitted
) {
924 if (non_lvalue_description
!= NULL
) {
925 _mesa_glsl_error(&lhs_loc
, state
,
927 non_lvalue_description
);
928 error_emitted
= true;
929 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
930 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
931 lhs_var
->data
.image_read_only
))) {
932 /* We can have image_read_only set on both images and buffer variables,
933 * but in the former there is a distinction between assignments to
934 * the variable itself (read_only) and to the memory they point to
935 * (image_read_only), while in the case of buffer variables there is
936 * no such distinction, that is why this check here is limited to
937 * buffer variables alone.
939 _mesa_glsl_error(&lhs_loc
, state
,
940 "assignment to read-only variable '%s'",
942 error_emitted
= true;
943 } else if (lhs
->type
->is_array() &&
944 !state
->check_version(120, 300, &lhs_loc
,
945 "whole array assignment forbidden")) {
946 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
948 * "Other binary or unary expressions, non-dereferenced
949 * arrays, function names, swizzles with repeated fields,
950 * and constants cannot be l-values."
952 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
954 error_emitted
= true;
955 } else if (!lhs
->is_lvalue()) {
956 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
957 error_emitted
= true;
962 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
963 if (new_rhs
!= NULL
) {
966 /* If the LHS array was not declared with a size, it takes it size from
967 * the RHS. If the LHS is an l-value and a whole array, it must be a
968 * dereference of a variable. Any other case would require that the LHS
969 * is either not an l-value or not a whole array.
971 if (lhs
->type
->is_unsized_array()) {
972 ir_dereference
*const d
= lhs
->as_dereference();
976 ir_variable
*const var
= d
->variable_referenced();
980 if (var
->data
.max_array_access
>= rhs
->type
->array_size()) {
981 /* FINISHME: This should actually log the location of the RHS. */
982 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
984 var
->data
.max_array_access
);
987 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
988 rhs
->type
->array_size());
991 if (lhs
->type
->is_array()) {
992 mark_whole_array_access(rhs
);
993 mark_whole_array_access(lhs
);
997 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
998 * but not post_inc) need the converted assigned value as an rvalue
999 * to handle things like:
1004 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1006 instructions
->push_tail(var
);
1007 instructions
->push_tail(assign(var
, rhs
));
1009 if (!error_emitted
) {
1010 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
1011 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1013 ir_rvalue
*rvalue
= new(ctx
) ir_dereference_variable(var
);
1015 *out_rvalue
= rvalue
;
1018 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1022 return error_emitted
;
1026 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1028 void *ctx
= ralloc_parent(lvalue
);
1031 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1033 instructions
->push_tail(var
);
1035 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1038 return new(ctx
) ir_dereference_variable(var
);
1043 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1045 (void) instructions
;
1052 ast_node::has_sequence_subexpression() const
1058 ast_node::set_is_lhs(bool /* new_value */)
1063 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1064 struct _mesa_glsl_parse_state
*state
)
1066 (void)hir(instructions
, state
);
1070 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1071 struct _mesa_glsl_parse_state
*state
)
1073 (void)hir(instructions
, state
);
1077 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1080 ir_rvalue
*cmp
= NULL
;
1082 if (operation
== ir_binop_all_equal
)
1083 join_op
= ir_binop_logic_and
;
1085 join_op
= ir_binop_logic_or
;
1087 switch (op0
->type
->base_type
) {
1088 case GLSL_TYPE_FLOAT
:
1089 case GLSL_TYPE_UINT
:
1091 case GLSL_TYPE_BOOL
:
1092 case GLSL_TYPE_DOUBLE
:
1093 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1095 case GLSL_TYPE_ARRAY
: {
1096 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1097 ir_rvalue
*e0
, *e1
, *result
;
1099 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1100 new(mem_ctx
) ir_constant(i
));
1101 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1102 new(mem_ctx
) ir_constant(i
));
1103 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1106 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1112 mark_whole_array_access(op0
);
1113 mark_whole_array_access(op1
);
1117 case GLSL_TYPE_STRUCT
: {
1118 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1119 ir_rvalue
*e0
, *e1
, *result
;
1120 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1122 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1124 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1126 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1129 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1137 case GLSL_TYPE_ERROR
:
1138 case GLSL_TYPE_VOID
:
1139 case GLSL_TYPE_SAMPLER
:
1140 case GLSL_TYPE_IMAGE
:
1141 case GLSL_TYPE_INTERFACE
:
1142 case GLSL_TYPE_ATOMIC_UINT
:
1143 case GLSL_TYPE_SUBROUTINE
:
1144 case GLSL_TYPE_FUNCTION
:
1145 /* I assume a comparison of a struct containing a sampler just
1146 * ignores the sampler present in the type.
1152 cmp
= new(mem_ctx
) ir_constant(true);
1157 /* For logical operations, we want to ensure that the operands are
1158 * scalar booleans. If it isn't, emit an error and return a constant
1159 * boolean to avoid triggering cascading error messages.
1162 get_scalar_boolean_operand(exec_list
*instructions
,
1163 struct _mesa_glsl_parse_state
*state
,
1164 ast_expression
*parent_expr
,
1166 const char *operand_name
,
1167 bool *error_emitted
)
1169 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1171 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1173 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1176 if (!*error_emitted
) {
1177 YYLTYPE loc
= expr
->get_location();
1178 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1180 parent_expr
->operator_string(parent_expr
->oper
));
1181 *error_emitted
= true;
1184 return new(ctx
) ir_constant(true);
1188 * If name refers to a builtin array whose maximum allowed size is less than
1189 * size, report an error and return true. Otherwise return false.
1192 check_builtin_array_max_size(const char *name
, unsigned size
,
1193 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1195 if ((strcmp("gl_TexCoord", name
) == 0)
1196 && (size
> state
->Const
.MaxTextureCoords
)) {
1197 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1199 * "The size [of gl_TexCoord] can be at most
1200 * gl_MaxTextureCoords."
1202 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1203 "be larger than gl_MaxTextureCoords (%u)",
1204 state
->Const
.MaxTextureCoords
);
1205 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1206 state
->clip_dist_size
= size
;
1207 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1208 /* From section 7.1 (Vertex Shader Special Variables) of the
1211 * "The gl_ClipDistance array is predeclared as unsized and
1212 * must be sized by the shader either redeclaring it with a
1213 * size or indexing it only with integral constant
1214 * expressions. ... The size can be at most
1215 * gl_MaxClipDistances."
1217 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1218 "be larger than gl_MaxClipDistances (%u)",
1219 state
->Const
.MaxClipPlanes
);
1221 } else if (strcmp("gl_CullDistance", name
) == 0) {
1222 state
->cull_dist_size
= size
;
1223 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1224 /* From the ARB_cull_distance spec:
1226 * "The gl_CullDistance array is predeclared as unsized and
1227 * must be sized by the shader either redeclaring it with
1228 * a size or indexing it only with integral constant
1229 * expressions. The size determines the number and set of
1230 * enabled cull distances and can be at most
1231 * gl_MaxCullDistances."
1233 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1234 "be larger than gl_MaxCullDistances (%u)",
1235 state
->Const
.MaxClipPlanes
);
1241 * Create the constant 1, of a which is appropriate for incrementing and
1242 * decrementing values of the given GLSL type. For example, if type is vec4,
1243 * this creates a constant value of 1.0 having type float.
1245 * If the given type is invalid for increment and decrement operators, return
1246 * a floating point 1--the error will be detected later.
1249 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1251 switch (type
->base_type
) {
1252 case GLSL_TYPE_UINT
:
1253 return new(ctx
) ir_constant((unsigned) 1);
1255 return new(ctx
) ir_constant(1);
1257 case GLSL_TYPE_FLOAT
:
1258 return new(ctx
) ir_constant(1.0f
);
1263 ast_expression::hir(exec_list
*instructions
,
1264 struct _mesa_glsl_parse_state
*state
)
1266 return do_hir(instructions
, state
, true);
1270 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1271 struct _mesa_glsl_parse_state
*state
)
1273 do_hir(instructions
, state
, false);
1277 ast_expression::set_is_lhs(bool new_value
)
1279 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1280 * if we lack an identifier we can just skip it.
1282 if (this->primary_expression
.identifier
== NULL
)
1285 this->is_lhs
= new_value
;
1287 /* We need to go through the subexpressions tree to cover cases like
1288 * ast_field_selection
1290 if (this->subexpressions
[0] != NULL
)
1291 this->subexpressions
[0]->set_is_lhs(new_value
);
1295 ast_expression::do_hir(exec_list
*instructions
,
1296 struct _mesa_glsl_parse_state
*state
,
1300 static const int operations
[AST_NUM_OPERATORS
] = {
1301 -1, /* ast_assign doesn't convert to ir_expression. */
1302 -1, /* ast_plus doesn't convert to ir_expression. */
1316 ir_binop_any_nequal
,
1326 /* Note: The following block of expression types actually convert
1327 * to multiple IR instructions.
1329 ir_binop_mul
, /* ast_mul_assign */
1330 ir_binop_div
, /* ast_div_assign */
1331 ir_binop_mod
, /* ast_mod_assign */
1332 ir_binop_add
, /* ast_add_assign */
1333 ir_binop_sub
, /* ast_sub_assign */
1334 ir_binop_lshift
, /* ast_ls_assign */
1335 ir_binop_rshift
, /* ast_rs_assign */
1336 ir_binop_bit_and
, /* ast_and_assign */
1337 ir_binop_bit_xor
, /* ast_xor_assign */
1338 ir_binop_bit_or
, /* ast_or_assign */
1340 -1, /* ast_conditional doesn't convert to ir_expression. */
1341 ir_binop_add
, /* ast_pre_inc. */
1342 ir_binop_sub
, /* ast_pre_dec. */
1343 ir_binop_add
, /* ast_post_inc. */
1344 ir_binop_sub
, /* ast_post_dec. */
1345 -1, /* ast_field_selection doesn't conv to ir_expression. */
1346 -1, /* ast_array_index doesn't convert to ir_expression. */
1347 -1, /* ast_function_call doesn't conv to ir_expression. */
1348 -1, /* ast_identifier doesn't convert to ir_expression. */
1349 -1, /* ast_int_constant doesn't convert to ir_expression. */
1350 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1351 -1, /* ast_float_constant doesn't conv to ir_expression. */
1352 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1353 -1, /* ast_sequence doesn't convert to ir_expression. */
1355 ir_rvalue
*result
= NULL
;
1357 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1358 bool error_emitted
= false;
1361 loc
= this->get_location();
1363 switch (this->oper
) {
1365 assert(!"ast_aggregate: Should never get here.");
1369 this->subexpressions
[0]->set_is_lhs(true);
1370 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1371 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1374 do_assignment(instructions
, state
,
1375 this->subexpressions
[0]->non_lvalue_description
,
1376 op
[0], op
[1], &result
, needs_rvalue
, false,
1377 this->subexpressions
[0]->get_location());
1382 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1384 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1386 error_emitted
= type
->is_error();
1392 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1394 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1396 error_emitted
= type
->is_error();
1398 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1406 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1407 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1409 type
= arithmetic_result_type(op
[0], op
[1],
1410 (this->oper
== ast_mul
),
1412 error_emitted
= type
->is_error();
1414 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1419 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1420 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1422 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1424 assert(operations
[this->oper
] == ir_binop_mod
);
1426 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1428 error_emitted
= type
->is_error();
1433 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1434 error_emitted
= true;
1437 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1438 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1439 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1441 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1443 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1450 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1451 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1453 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1455 /* The relational operators must either generate an error or result
1456 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1458 assert(type
->is_error()
1459 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1460 && type
->is_scalar()));
1462 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1464 error_emitted
= type
->is_error();
1469 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1470 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1472 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1474 * "The equality operators equal (==), and not equal (!=)
1475 * operate on all types. They result in a scalar Boolean. If
1476 * the operand types do not match, then there must be a
1477 * conversion from Section 4.1.10 "Implicit Conversions"
1478 * applied to one operand that can make them match, in which
1479 * case this conversion is done."
1482 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1483 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1484 "no operation `%1$s' exists that takes a left-hand "
1485 "operand of type 'void' or a right operand of type "
1486 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1487 error_emitted
= true;
1488 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1489 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1490 || (op
[0]->type
!= op
[1]->type
)) {
1491 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1492 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1493 error_emitted
= true;
1494 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1495 !state
->check_version(120, 300, &loc
,
1496 "array comparisons forbidden")) {
1497 error_emitted
= true;
1498 } else if ((op
[0]->type
->contains_opaque() ||
1499 op
[1]->type
->contains_opaque())) {
1500 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1501 error_emitted
= true;
1504 if (error_emitted
) {
1505 result
= new(ctx
) ir_constant(false);
1507 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1508 assert(result
->type
== glsl_type::bool_type
);
1515 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1516 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1517 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1518 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1520 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1524 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1526 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1527 error_emitted
= true;
1530 if (!op
[0]->type
->is_integer()) {
1531 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1532 error_emitted
= true;
1535 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1536 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1539 case ast_logic_and
: {
1540 exec_list rhs_instructions
;
1541 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1542 "LHS", &error_emitted
);
1543 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1544 "RHS", &error_emitted
);
1546 if (rhs_instructions
.is_empty()) {
1547 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1548 type
= result
->type
;
1550 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1553 instructions
->push_tail(tmp
);
1555 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1556 instructions
->push_tail(stmt
);
1558 stmt
->then_instructions
.append_list(&rhs_instructions
);
1559 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1560 ir_assignment
*const then_assign
=
1561 new(ctx
) ir_assignment(then_deref
, op
[1]);
1562 stmt
->then_instructions
.push_tail(then_assign
);
1564 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1565 ir_assignment
*const else_assign
=
1566 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1567 stmt
->else_instructions
.push_tail(else_assign
);
1569 result
= new(ctx
) ir_dereference_variable(tmp
);
1575 case ast_logic_or
: {
1576 exec_list rhs_instructions
;
1577 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1578 "LHS", &error_emitted
);
1579 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1580 "RHS", &error_emitted
);
1582 if (rhs_instructions
.is_empty()) {
1583 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1584 type
= result
->type
;
1586 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1589 instructions
->push_tail(tmp
);
1591 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1592 instructions
->push_tail(stmt
);
1594 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1595 ir_assignment
*const then_assign
=
1596 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1597 stmt
->then_instructions
.push_tail(then_assign
);
1599 stmt
->else_instructions
.append_list(&rhs_instructions
);
1600 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1601 ir_assignment
*const else_assign
=
1602 new(ctx
) ir_assignment(else_deref
, op
[1]);
1603 stmt
->else_instructions
.push_tail(else_assign
);
1605 result
= new(ctx
) ir_dereference_variable(tmp
);
1612 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1614 * "The logical binary operators and (&&), or ( | | ), and
1615 * exclusive or (^^). They operate only on two Boolean
1616 * expressions and result in a Boolean expression."
1618 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1620 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1623 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1628 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1629 "operand", &error_emitted
);
1631 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1635 case ast_mul_assign
:
1636 case ast_div_assign
:
1637 case ast_add_assign
:
1638 case ast_sub_assign
: {
1639 this->subexpressions
[0]->set_is_lhs(true);
1640 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1641 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1643 type
= arithmetic_result_type(op
[0], op
[1],
1644 (this->oper
== ast_mul_assign
),
1647 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1651 do_assignment(instructions
, state
,
1652 this->subexpressions
[0]->non_lvalue_description
,
1653 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1654 &result
, needs_rvalue
, false,
1655 this->subexpressions
[0]->get_location());
1657 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1658 * explicitly test for this because none of the binary expression
1659 * operators allow array operands either.
1665 case ast_mod_assign
: {
1666 this->subexpressions
[0]->set_is_lhs(true);
1667 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1668 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1670 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1672 assert(operations
[this->oper
] == ir_binop_mod
);
1674 ir_rvalue
*temp_rhs
;
1675 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1679 do_assignment(instructions
, state
,
1680 this->subexpressions
[0]->non_lvalue_description
,
1681 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1682 &result
, needs_rvalue
, false,
1683 this->subexpressions
[0]->get_location());
1688 case ast_rs_assign
: {
1689 this->subexpressions
[0]->set_is_lhs(true);
1690 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1691 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1692 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1694 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1695 type
, op
[0], op
[1]);
1697 do_assignment(instructions
, state
,
1698 this->subexpressions
[0]->non_lvalue_description
,
1699 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1700 &result
, needs_rvalue
, false,
1701 this->subexpressions
[0]->get_location());
1705 case ast_and_assign
:
1706 case ast_xor_assign
:
1707 case ast_or_assign
: {
1708 this->subexpressions
[0]->set_is_lhs(true);
1709 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1710 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1711 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1712 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1713 type
, op
[0], op
[1]);
1715 do_assignment(instructions
, state
,
1716 this->subexpressions
[0]->non_lvalue_description
,
1717 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1718 &result
, needs_rvalue
, false,
1719 this->subexpressions
[0]->get_location());
1723 case ast_conditional
: {
1724 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1726 * "The ternary selection operator (?:). It operates on three
1727 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1728 * first expression, which must result in a scalar Boolean."
1730 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1731 "condition", &error_emitted
);
1733 /* The :? operator is implemented by generating an anonymous temporary
1734 * followed by an if-statement. The last instruction in each branch of
1735 * the if-statement assigns a value to the anonymous temporary. This
1736 * temporary is the r-value of the expression.
1738 exec_list then_instructions
;
1739 exec_list else_instructions
;
1741 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1742 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1744 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1746 * "The second and third expressions can be any type, as
1747 * long their types match, or there is a conversion in
1748 * Section 4.1.10 "Implicit Conversions" that can be applied
1749 * to one of the expressions to make their types match. This
1750 * resulting matching type is the type of the entire
1753 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1754 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1755 || (op
[1]->type
!= op
[2]->type
)) {
1756 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1758 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1759 "operator must have matching types");
1760 error_emitted
= true;
1761 type
= glsl_type::error_type
;
1766 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1768 * "The second and third expressions must be the same type, but can
1769 * be of any type other than an array."
1771 if (type
->is_array() &&
1772 !state
->check_version(120, 300, &loc
,
1773 "second and third operands of ?: operator "
1774 "cannot be arrays")) {
1775 error_emitted
= true;
1778 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1780 * "Except for array indexing, structure member selection, and
1781 * parentheses, opaque variables are not allowed to be operands in
1782 * expressions; such use results in a compile-time error."
1784 if (type
->contains_opaque()) {
1785 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1786 "of the ?: operator");
1787 error_emitted
= true;
1790 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1792 if (then_instructions
.is_empty()
1793 && else_instructions
.is_empty()
1794 && cond_val
!= NULL
) {
1795 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1797 /* The copy to conditional_tmp reads the whole array. */
1798 if (type
->is_array()) {
1799 mark_whole_array_access(op
[1]);
1800 mark_whole_array_access(op
[2]);
1803 ir_variable
*const tmp
=
1804 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1805 instructions
->push_tail(tmp
);
1807 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1808 instructions
->push_tail(stmt
);
1810 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1811 ir_dereference
*const then_deref
=
1812 new(ctx
) ir_dereference_variable(tmp
);
1813 ir_assignment
*const then_assign
=
1814 new(ctx
) ir_assignment(then_deref
, op
[1]);
1815 stmt
->then_instructions
.push_tail(then_assign
);
1817 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1818 ir_dereference
*const else_deref
=
1819 new(ctx
) ir_dereference_variable(tmp
);
1820 ir_assignment
*const else_assign
=
1821 new(ctx
) ir_assignment(else_deref
, op
[2]);
1822 stmt
->else_instructions
.push_tail(else_assign
);
1824 result
= new(ctx
) ir_dereference_variable(tmp
);
1831 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1832 ? "pre-increment operation" : "pre-decrement operation";
1834 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1835 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1837 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1839 ir_rvalue
*temp_rhs
;
1840 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1844 do_assignment(instructions
, state
,
1845 this->subexpressions
[0]->non_lvalue_description
,
1846 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1847 &result
, needs_rvalue
, false,
1848 this->subexpressions
[0]->get_location());
1853 case ast_post_dec
: {
1854 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1855 ? "post-increment operation" : "post-decrement operation";
1856 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1857 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1859 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1861 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1863 ir_rvalue
*temp_rhs
;
1864 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1867 /* Get a temporary of a copy of the lvalue before it's modified.
1868 * This may get thrown away later.
1870 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1872 ir_rvalue
*junk_rvalue
;
1874 do_assignment(instructions
, state
,
1875 this->subexpressions
[0]->non_lvalue_description
,
1876 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1877 &junk_rvalue
, false, false,
1878 this->subexpressions
[0]->get_location());
1883 case ast_field_selection
:
1884 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1887 case ast_array_index
: {
1888 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1890 /* Getting if an array is being used uninitialized is beyond what we get
1891 * from ir_value.data.assigned. Setting is_lhs as true would force to
1892 * not raise a uninitialized warning when using an array
1894 subexpressions
[0]->set_is_lhs(true);
1895 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1896 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1898 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1901 if (result
->type
->is_error())
1902 error_emitted
= true;
1907 case ast_unsized_array_dim
:
1908 assert(!"ast_unsized_array_dim: Should never get here.");
1911 case ast_function_call
:
1912 /* Should *NEVER* get here. ast_function_call should always be handled
1913 * by ast_function_expression::hir.
1918 case ast_identifier
: {
1919 /* ast_identifier can appear several places in a full abstract syntax
1920 * tree. This particular use must be at location specified in the grammar
1921 * as 'variable_identifier'.
1924 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1927 /* the identifier might be a subroutine name */
1929 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
1930 var
= state
->symbols
->get_variable(sub_name
);
1931 ralloc_free(sub_name
);
1935 var
->data
.used
= true;
1936 result
= new(ctx
) ir_dereference_variable(var
);
1938 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
1940 && result
->variable_referenced()->data
.assigned
!= true
1941 && !is_gl_identifier(var
->name
)) {
1942 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
1943 this->primary_expression
.identifier
);
1946 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1947 this->primary_expression
.identifier
);
1949 result
= ir_rvalue::error_value(ctx
);
1950 error_emitted
= true;
1955 case ast_int_constant
:
1956 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1959 case ast_uint_constant
:
1960 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1963 case ast_float_constant
:
1964 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1967 case ast_bool_constant
:
1968 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1971 case ast_double_constant
:
1972 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1975 case ast_sequence
: {
1976 /* It should not be possible to generate a sequence in the AST without
1977 * any expressions in it.
1979 assert(!this->expressions
.is_empty());
1981 /* The r-value of a sequence is the last expression in the sequence. If
1982 * the other expressions in the sequence do not have side-effects (and
1983 * therefore add instructions to the instruction list), they get dropped
1986 exec_node
*previous_tail_pred
= NULL
;
1987 YYLTYPE previous_operand_loc
= loc
;
1989 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1990 /* If one of the operands of comma operator does not generate any
1991 * code, we want to emit a warning. At each pass through the loop
1992 * previous_tail_pred will point to the last instruction in the
1993 * stream *before* processing the previous operand. Naturally,
1994 * instructions->tail_pred will point to the last instruction in the
1995 * stream *after* processing the previous operand. If the two
1996 * pointers match, then the previous operand had no effect.
1998 * The warning behavior here differs slightly from GCC. GCC will
1999 * only emit a warning if none of the left-hand operands have an
2000 * effect. However, it will emit a warning for each. I believe that
2001 * there are some cases in C (especially with GCC extensions) where
2002 * it is useful to have an intermediate step in a sequence have no
2003 * effect, but I don't think these cases exist in GLSL. Either way,
2004 * it would be a giant hassle to replicate that behavior.
2006 if (previous_tail_pred
== instructions
->tail_pred
) {
2007 _mesa_glsl_warning(&previous_operand_loc
, state
,
2008 "left-hand operand of comma expression has "
2012 /* tail_pred is directly accessed instead of using the get_tail()
2013 * method for performance reasons. get_tail() has extra code to
2014 * return NULL when the list is empty. We don't care about that
2015 * here, so using tail_pred directly is fine.
2017 previous_tail_pred
= instructions
->tail_pred
;
2018 previous_operand_loc
= ast
->get_location();
2020 result
= ast
->hir(instructions
, state
);
2023 /* Any errors should have already been emitted in the loop above.
2025 error_emitted
= true;
2029 type
= NULL
; /* use result->type, not type. */
2030 assert(result
!= NULL
|| !needs_rvalue
);
2032 if (result
&& result
->type
->is_error() && !error_emitted
)
2033 _mesa_glsl_error(& loc
, state
, "type mismatch");
2039 ast_expression::has_sequence_subexpression() const
2041 switch (this->oper
) {
2050 return this->subexpressions
[0]->has_sequence_subexpression();
2072 case ast_array_index
:
2073 case ast_mul_assign
:
2074 case ast_div_assign
:
2075 case ast_add_assign
:
2076 case ast_sub_assign
:
2077 case ast_mod_assign
:
2080 case ast_and_assign
:
2081 case ast_xor_assign
:
2083 return this->subexpressions
[0]->has_sequence_subexpression() ||
2084 this->subexpressions
[1]->has_sequence_subexpression();
2086 case ast_conditional
:
2087 return this->subexpressions
[0]->has_sequence_subexpression() ||
2088 this->subexpressions
[1]->has_sequence_subexpression() ||
2089 this->subexpressions
[2]->has_sequence_subexpression();
2094 case ast_field_selection
:
2095 case ast_identifier
:
2096 case ast_int_constant
:
2097 case ast_uint_constant
:
2098 case ast_float_constant
:
2099 case ast_bool_constant
:
2100 case ast_double_constant
:
2106 case ast_function_call
:
2107 unreachable("should be handled by ast_function_expression::hir");
2109 case ast_unsized_array_dim
:
2110 unreachable("ast_unsized_array_dim: Should never get here.");
2117 ast_expression_statement::hir(exec_list
*instructions
,
2118 struct _mesa_glsl_parse_state
*state
)
2120 /* It is possible to have expression statements that don't have an
2121 * expression. This is the solitary semicolon:
2123 * for (i = 0; i < 5; i++)
2126 * In this case the expression will be NULL. Test for NULL and don't do
2127 * anything in that case.
2129 if (expression
!= NULL
)
2130 expression
->hir_no_rvalue(instructions
, state
);
2132 /* Statements do not have r-values.
2139 ast_compound_statement::hir(exec_list
*instructions
,
2140 struct _mesa_glsl_parse_state
*state
)
2143 state
->symbols
->push_scope();
2145 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2146 ast
->hir(instructions
, state
);
2149 state
->symbols
->pop_scope();
2151 /* Compound statements do not have r-values.
2157 * Evaluate the given exec_node (which should be an ast_node representing
2158 * a single array dimension) and return its integer value.
2161 process_array_size(exec_node
*node
,
2162 struct _mesa_glsl_parse_state
*state
)
2164 exec_list dummy_instructions
;
2166 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2169 * Dimensions other than the outermost dimension can by unsized if they
2170 * are immediately sized by a constructor or initializer.
2172 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2175 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2176 YYLTYPE loc
= array_size
->get_location();
2179 _mesa_glsl_error(& loc
, state
,
2180 "array size could not be resolved");
2184 if (!ir
->type
->is_integer()) {
2185 _mesa_glsl_error(& loc
, state
,
2186 "array size must be integer type");
2190 if (!ir
->type
->is_scalar()) {
2191 _mesa_glsl_error(& loc
, state
,
2192 "array size must be scalar type");
2196 ir_constant
*const size
= ir
->constant_expression_value();
2198 (state
->is_version(120, 300) &&
2199 array_size
->has_sequence_subexpression())) {
2200 _mesa_glsl_error(& loc
, state
, "array size must be a "
2201 "constant valued expression");
2205 if (size
->value
.i
[0] <= 0) {
2206 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2210 assert(size
->type
== ir
->type
);
2212 /* If the array size is const (and we've verified that
2213 * it is) then no instructions should have been emitted
2214 * when we converted it to HIR. If they were emitted,
2215 * then either the array size isn't const after all, or
2216 * we are emitting unnecessary instructions.
2218 assert(dummy_instructions
.is_empty());
2220 return size
->value
.u
[0];
2223 static const glsl_type
*
2224 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2225 ast_array_specifier
*array_specifier
,
2226 struct _mesa_glsl_parse_state
*state
)
2228 const glsl_type
*array_type
= base
;
2230 if (array_specifier
!= NULL
) {
2231 if (base
->is_array()) {
2233 /* From page 19 (page 25) of the GLSL 1.20 spec:
2235 * "Only one-dimensional arrays may be declared."
2237 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2238 return glsl_type::error_type
;
2242 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2243 !node
->is_head_sentinel(); node
= node
->prev
) {
2244 unsigned array_size
= process_array_size(node
, state
);
2245 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2253 precision_qualifier_allowed(const glsl_type
*type
)
2255 /* Precision qualifiers apply to floating point, integer and opaque
2258 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2259 * "Any floating point or any integer declaration can have the type
2260 * preceded by one of these precision qualifiers [...] Literal
2261 * constants do not have precision qualifiers. Neither do Boolean
2264 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2267 * "Precision qualifiers are added for code portability with OpenGL
2268 * ES, not for functionality. They have the same syntax as in OpenGL
2271 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2273 * "uniform lowp sampler2D sampler;
2276 * lowp vec4 col = texture2D (sampler, coord);
2277 * // texture2D returns lowp"
2279 * From this, we infer that GLSL 1.30 (and later) should allow precision
2280 * qualifiers on sampler types just like float and integer types.
2282 const glsl_type
*const t
= type
->without_array();
2284 return (t
->is_float() || t
->is_integer() || t
->contains_opaque()) &&
2289 ast_type_specifier::glsl_type(const char **name
,
2290 struct _mesa_glsl_parse_state
*state
) const
2292 const struct glsl_type
*type
;
2294 type
= state
->symbols
->get_type(this->type_name
);
2295 *name
= this->type_name
;
2297 YYLTYPE loc
= this->get_location();
2298 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2304 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2306 * "The precision statement
2308 * precision precision-qualifier type;
2310 * can be used to establish a default precision qualifier. The type field can
2311 * be either int or float or any of the sampler types, (...) If type is float,
2312 * the directive applies to non-precision-qualified floating point type
2313 * (scalar, vector, and matrix) declarations. If type is int, the directive
2314 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2315 * and unsigned) declarations."
2317 * We use the symbol table to keep the values of the default precisions for
2318 * each 'type' in each scope and we use the 'type' string from the precision
2319 * statement as key in the symbol table. When we want to retrieve the default
2320 * precision associated with a given glsl_type we need to know the type string
2321 * associated with it. This is what this function returns.
2324 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2326 switch (type
->base_type
) {
2327 case GLSL_TYPE_FLOAT
:
2329 case GLSL_TYPE_UINT
:
2332 case GLSL_TYPE_ATOMIC_UINT
:
2333 return "atomic_uint";
2334 case GLSL_TYPE_IMAGE
:
2336 case GLSL_TYPE_SAMPLER
: {
2337 const unsigned type_idx
=
2338 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2339 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2340 assert(type_idx
< 4);
2341 switch (type
->sampled_type
) {
2342 case GLSL_TYPE_FLOAT
:
2343 switch (type
->sampler_dimensionality
) {
2344 case GLSL_SAMPLER_DIM_1D
: {
2345 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2346 static const char *const names
[4] = {
2347 "sampler1D", "sampler1DArray",
2348 "sampler1DShadow", "sampler1DArrayShadow"
2350 return names
[type_idx
];
2352 case GLSL_SAMPLER_DIM_2D
: {
2353 static const char *const names
[8] = {
2354 "sampler2D", "sampler2DArray",
2355 "sampler2DShadow", "sampler2DArrayShadow",
2356 "image2D", "image2DArray", NULL
, NULL
2358 return names
[offset
+ type_idx
];
2360 case GLSL_SAMPLER_DIM_3D
: {
2361 static const char *const names
[8] = {
2362 "sampler3D", NULL
, NULL
, NULL
,
2363 "image3D", NULL
, NULL
, NULL
2365 return names
[offset
+ type_idx
];
2367 case GLSL_SAMPLER_DIM_CUBE
: {
2368 static const char *const names
[8] = {
2369 "samplerCube", "samplerCubeArray",
2370 "samplerCubeShadow", "samplerCubeArrayShadow",
2371 "imageCube", NULL
, NULL
, NULL
2373 return names
[offset
+ type_idx
];
2375 case GLSL_SAMPLER_DIM_MS
: {
2376 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2377 static const char *const names
[4] = {
2378 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2380 return names
[type_idx
];
2382 case GLSL_SAMPLER_DIM_RECT
: {
2383 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2384 static const char *const names
[4] = {
2385 "samplerRect", NULL
, "samplerRectShadow", NULL
2387 return names
[type_idx
];
2389 case GLSL_SAMPLER_DIM_BUF
: {
2390 static const char *const names
[8] = {
2391 "samplerBuffer", NULL
, NULL
, NULL
,
2392 "imageBuffer", NULL
, NULL
, NULL
2394 return names
[offset
+ type_idx
];
2396 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2397 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2398 static const char *const names
[4] = {
2399 "samplerExternalOES", NULL
, NULL
, NULL
2401 return names
[type_idx
];
2404 unreachable("Unsupported sampler/image dimensionality");
2405 } /* sampler/image float dimensionality */
2408 switch (type
->sampler_dimensionality
) {
2409 case GLSL_SAMPLER_DIM_1D
: {
2410 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2411 static const char *const names
[4] = {
2412 "isampler1D", "isampler1DArray", NULL
, NULL
2414 return names
[type_idx
];
2416 case GLSL_SAMPLER_DIM_2D
: {
2417 static const char *const names
[8] = {
2418 "isampler2D", "isampler2DArray", NULL
, NULL
,
2419 "iimage2D", "iimage2DArray", NULL
, NULL
2421 return names
[offset
+ type_idx
];
2423 case GLSL_SAMPLER_DIM_3D
: {
2424 static const char *const names
[8] = {
2425 "isampler3D", NULL
, NULL
, NULL
,
2426 "iimage3D", NULL
, NULL
, NULL
2428 return names
[offset
+ type_idx
];
2430 case GLSL_SAMPLER_DIM_CUBE
: {
2431 static const char *const names
[8] = {
2432 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2433 "iimageCube", NULL
, NULL
, NULL
2435 return names
[offset
+ type_idx
];
2437 case GLSL_SAMPLER_DIM_MS
: {
2438 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2439 static const char *const names
[4] = {
2440 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2442 return names
[type_idx
];
2444 case GLSL_SAMPLER_DIM_RECT
: {
2445 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2446 static const char *const names
[4] = {
2447 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2449 return names
[type_idx
];
2451 case GLSL_SAMPLER_DIM_BUF
: {
2452 static const char *const names
[8] = {
2453 "isamplerBuffer", NULL
, NULL
, NULL
,
2454 "iimageBuffer", NULL
, NULL
, NULL
2456 return names
[offset
+ type_idx
];
2459 unreachable("Unsupported isampler/iimage dimensionality");
2460 } /* sampler/image int dimensionality */
2462 case GLSL_TYPE_UINT
:
2463 switch (type
->sampler_dimensionality
) {
2464 case GLSL_SAMPLER_DIM_1D
: {
2465 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2466 static const char *const names
[4] = {
2467 "usampler1D", "usampler1DArray", NULL
, NULL
2469 return names
[type_idx
];
2471 case GLSL_SAMPLER_DIM_2D
: {
2472 static const char *const names
[8] = {
2473 "usampler2D", "usampler2DArray", NULL
, NULL
,
2474 "uimage2D", "uimage2DArray", NULL
, NULL
2476 return names
[offset
+ type_idx
];
2478 case GLSL_SAMPLER_DIM_3D
: {
2479 static const char *const names
[8] = {
2480 "usampler3D", NULL
, NULL
, NULL
,
2481 "uimage3D", NULL
, NULL
, NULL
2483 return names
[offset
+ type_idx
];
2485 case GLSL_SAMPLER_DIM_CUBE
: {
2486 static const char *const names
[8] = {
2487 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2488 "uimageCube", NULL
, NULL
, NULL
2490 return names
[offset
+ type_idx
];
2492 case GLSL_SAMPLER_DIM_MS
: {
2493 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2494 static const char *const names
[4] = {
2495 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2497 return names
[type_idx
];
2499 case GLSL_SAMPLER_DIM_RECT
: {
2500 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2501 static const char *const names
[4] = {
2502 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2504 return names
[type_idx
];
2506 case GLSL_SAMPLER_DIM_BUF
: {
2507 static const char *const names
[8] = {
2508 "usamplerBuffer", NULL
, NULL
, NULL
,
2509 "uimageBuffer", NULL
, NULL
, NULL
2511 return names
[offset
+ type_idx
];
2514 unreachable("Unsupported usampler/uimage dimensionality");
2515 } /* sampler/image uint dimensionality */
2518 unreachable("Unsupported sampler/image type");
2519 } /* sampler/image type */
2521 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2524 unreachable("Unsupported type");
2529 select_gles_precision(unsigned qual_precision
,
2530 const glsl_type
*type
,
2531 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2533 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2534 * In GLES we take the precision from the type qualifier if present,
2535 * otherwise, if the type of the variable allows precision qualifiers at
2536 * all, we look for the default precision qualifier for that type in the
2539 assert(state
->es_shader
);
2541 unsigned precision
= GLSL_PRECISION_NONE
;
2542 if (qual_precision
) {
2543 precision
= qual_precision
;
2544 } else if (precision_qualifier_allowed(type
)) {
2545 const char *type_name
=
2546 get_type_name_for_precision_qualifier(type
->without_array());
2547 assert(type_name
!= NULL
);
2550 state
->symbols
->get_default_precision_qualifier(type_name
);
2551 if (precision
== ast_precision_none
) {
2552 _mesa_glsl_error(loc
, state
,
2553 "No precision specified in this scope for type `%s'",
2561 ast_fully_specified_type::glsl_type(const char **name
,
2562 struct _mesa_glsl_parse_state
*state
) const
2564 return this->specifier
->glsl_type(name
, state
);
2568 * Determine whether a toplevel variable declaration declares a varying. This
2569 * function operates by examining the variable's mode and the shader target,
2570 * so it correctly identifies linkage variables regardless of whether they are
2571 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2573 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2574 * this function will produce undefined results.
2577 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2580 case MESA_SHADER_VERTEX
:
2581 return var
->data
.mode
== ir_var_shader_out
;
2582 case MESA_SHADER_FRAGMENT
:
2583 return var
->data
.mode
== ir_var_shader_in
;
2585 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2591 * Matrix layout qualifiers are only allowed on certain types
2594 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2596 const glsl_type
*type
,
2599 if (var
&& !var
->is_in_buffer_block()) {
2600 /* Layout qualifiers may only apply to interface blocks and fields in
2603 _mesa_glsl_error(loc
, state
,
2604 "uniform block layout qualifiers row_major and "
2605 "column_major may not be applied to variables "
2606 "outside of uniform blocks");
2607 } else if (!type
->without_array()->is_matrix()) {
2608 /* The OpenGL ES 3.0 conformance tests did not originally allow
2609 * matrix layout qualifiers on non-matrices. However, the OpenGL
2610 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2611 * amended to specifically allow these layouts on all types. Emit
2612 * a warning so that people know their code may not be portable.
2614 _mesa_glsl_warning(loc
, state
,
2615 "uniform block layout qualifiers row_major and "
2616 "column_major applied to non-matrix types may "
2617 "be rejected by older compilers");
2622 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2623 struct _mesa_glsl_parse_state
*state
,
2624 unsigned xfb_buffer
) {
2625 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2626 _mesa_glsl_error(loc
, state
,
2627 "invalid xfb_buffer specified %d is larger than "
2628 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2630 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2637 /* From the ARB_enhanced_layouts spec:
2639 * "Variables and block members qualified with *xfb_offset* can be
2640 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2641 * The offset must be a multiple of the size of the first component of
2642 * the first qualified variable or block member, or a compile-time error
2643 * results. Further, if applied to an aggregate containing a double,
2644 * the offset must also be a multiple of 8, and the space taken in the
2645 * buffer will be a multiple of 8.
2648 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2649 struct _mesa_glsl_parse_state
*state
,
2650 int xfb_offset
, const glsl_type
*type
,
2651 unsigned component_size
) {
2652 const glsl_type
*t_without_array
= type
->without_array();
2654 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2655 _mesa_glsl_error(loc
, state
,
2656 "xfb_offset can't be used with unsized arrays.");
2660 /* Make sure nested structs don't contain unsized arrays, and validate
2661 * any xfb_offsets on interface members.
2663 if (t_without_array
->is_record() || t_without_array
->is_interface())
2664 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2665 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2667 /* When the interface block doesn't have an xfb_offset qualifier then
2668 * we apply the component size rules at the member level.
2670 if (xfb_offset
== -1)
2671 component_size
= member_t
->contains_double() ? 8 : 4;
2673 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2674 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2678 /* Nested structs or interface block without offset may not have had an
2679 * offset applied yet so return.
2681 if (xfb_offset
== -1) {
2685 if (xfb_offset
% component_size
) {
2686 _mesa_glsl_error(loc
, state
,
2687 "invalid qualifier xfb_offset=%d must be a multiple "
2688 "of the first component size of the first qualified "
2689 "variable or block member. Or double if an aggregate "
2690 "that contains a double (%d).",
2691 xfb_offset
, component_size
);
2699 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2702 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2703 _mesa_glsl_error(loc
, state
,
2704 "invalid stream specified %d is larger than "
2705 "MAX_VERTEX_STREAMS - 1 (%d).",
2706 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2714 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2717 const glsl_type
*type
,
2718 const ast_type_qualifier
*qual
)
2720 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2721 _mesa_glsl_error(loc
, state
,
2722 "the \"binding\" qualifier only applies to uniforms and "
2723 "shader storage buffer objects");
2727 unsigned qual_binding
;
2728 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2733 const struct gl_context
*const ctx
= state
->ctx
;
2734 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2735 unsigned max_index
= qual_binding
+ elements
- 1;
2736 const glsl_type
*base_type
= type
->without_array();
2738 if (base_type
->is_interface()) {
2739 /* UBOs. From page 60 of the GLSL 4.20 specification:
2740 * "If the binding point for any uniform block instance is less than zero,
2741 * or greater than or equal to the implementation-dependent maximum
2742 * number of uniform buffer bindings, a compilation error will occur.
2743 * When the binding identifier is used with a uniform block instanced as
2744 * an array of size N, all elements of the array from binding through
2745 * binding + N – 1 must be within this range."
2747 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2749 if (qual
->flags
.q
.uniform
&&
2750 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2751 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2752 "the maximum number of UBO binding points (%d)",
2753 qual_binding
, elements
,
2754 ctx
->Const
.MaxUniformBufferBindings
);
2758 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2759 * "If the binding point for any uniform or shader storage block instance
2760 * is less than zero, or greater than or equal to the
2761 * implementation-dependent maximum number of uniform buffer bindings, a
2762 * compile-time error will occur. When the binding identifier is used
2763 * with a uniform or shader storage block instanced as an array of size
2764 * N, all elements of the array from binding through binding + N – 1 must
2765 * be within this range."
2767 if (qual
->flags
.q
.buffer
&&
2768 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2769 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2770 "the maximum number of SSBO binding points (%d)",
2771 qual_binding
, elements
,
2772 ctx
->Const
.MaxShaderStorageBufferBindings
);
2775 } else if (base_type
->is_sampler()) {
2776 /* Samplers. From page 63 of the GLSL 4.20 specification:
2777 * "If the binding is less than zero, or greater than or equal to the
2778 * implementation-dependent maximum supported number of units, a
2779 * compilation error will occur. When the binding identifier is used
2780 * with an array of size N, all elements of the array from binding
2781 * through binding + N - 1 must be within this range."
2783 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2785 if (max_index
>= limit
) {
2786 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2787 "exceeds the maximum number of texture image units "
2788 "(%u)", qual_binding
, elements
, limit
);
2792 } else if (base_type
->contains_atomic()) {
2793 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2794 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2795 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2796 " maximum number of atomic counter buffer bindings"
2797 "(%u)", qual_binding
,
2798 ctx
->Const
.MaxAtomicBufferBindings
);
2802 } else if ((state
->is_version(420, 310) ||
2803 state
->ARB_shading_language_420pack_enable
) &&
2804 base_type
->is_image()) {
2805 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2806 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2807 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2808 " maximum number of image units (%d)", max_index
,
2809 ctx
->Const
.MaxImageUnits
);
2814 _mesa_glsl_error(loc
, state
,
2815 "the \"binding\" qualifier only applies to uniform "
2816 "blocks, opaque variables, or arrays thereof");
2820 var
->data
.explicit_binding
= true;
2821 var
->data
.binding
= qual_binding
;
2828 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
2830 const glsl_interp_mode interpolation
,
2831 const struct ast_type_qualifier
*qual
,
2832 const struct glsl_type
*var_type
,
2833 ir_variable_mode mode
)
2835 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
2836 * not to vertex shader inputs nor fragment shader outputs.
2838 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2839 * "Outputs from a vertex shader (out) and inputs to a fragment
2840 * shader (in) can be further qualified with one or more of these
2841 * interpolation qualifiers"
2843 * "These interpolation qualifiers may only precede the qualifiers in,
2844 * centroid in, out, or centroid out in a declaration. They do not apply
2845 * to the deprecated storage qualifiers varying or centroid
2846 * varying. They also do not apply to inputs into a vertex shader or
2847 * outputs from a fragment shader."
2849 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
2850 * "Outputs from a shader (out) and inputs to a shader (in) can be
2851 * further qualified with one of these interpolation qualifiers."
2853 * "These interpolation qualifiers may only precede the qualifiers
2854 * in, centroid in, out, or centroid out in a declaration. They do
2855 * not apply to inputs into a vertex shader or outputs from a
2858 if (state
->is_version(130, 300)
2859 && interpolation
!= INTERP_MODE_NONE
) {
2860 const char *i
= interpolation_string(interpolation
);
2861 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
2862 _mesa_glsl_error(loc
, state
,
2863 "interpolation qualifier `%s' can only be applied to "
2864 "shader inputs or outputs.", i
);
2866 switch (state
->stage
) {
2867 case MESA_SHADER_VERTEX
:
2868 if (mode
== ir_var_shader_in
) {
2869 _mesa_glsl_error(loc
, state
,
2870 "interpolation qualifier '%s' cannot be applied to "
2871 "vertex shader inputs", i
);
2874 case MESA_SHADER_FRAGMENT
:
2875 if (mode
== ir_var_shader_out
) {
2876 _mesa_glsl_error(loc
, state
,
2877 "interpolation qualifier '%s' cannot be applied to "
2878 "fragment shader outputs", i
);
2886 /* Interpolation qualifiers cannot be applied to 'centroid' and
2887 * 'centroid varying'.
2889 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2890 * "interpolation qualifiers may only precede the qualifiers in,
2891 * centroid in, out, or centroid out in a declaration. They do not apply
2892 * to the deprecated storage qualifiers varying or centroid varying."
2894 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2896 if (state
->is_version(130, 0)
2897 && interpolation
!= INTERP_MODE_NONE
2898 && qual
->flags
.q
.varying
) {
2900 const char *i
= interpolation_string(interpolation
);
2902 if (qual
->flags
.q
.centroid
)
2903 s
= "centroid varying";
2907 _mesa_glsl_error(loc
, state
,
2908 "qualifier '%s' cannot be applied to the "
2909 "deprecated storage qualifier '%s'", i
, s
);
2912 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2913 * so must integer vertex outputs.
2915 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2916 * "Fragment shader inputs that are signed or unsigned integers or
2917 * integer vectors must be qualified with the interpolation qualifier
2920 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2921 * "Fragment shader inputs that are, or contain, signed or unsigned
2922 * integers or integer vectors must be qualified with the
2923 * interpolation qualifier flat."
2925 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2926 * "Vertex shader outputs that are, or contain, signed or unsigned
2927 * integers or integer vectors must be qualified with the
2928 * interpolation qualifier flat."
2930 * Note that prior to GLSL 1.50, this requirement applied to vertex
2931 * outputs rather than fragment inputs. That creates problems in the
2932 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2933 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2934 * apply the restriction to both vertex outputs and fragment inputs.
2936 * Note also that the desktop GLSL specs are missing the text "or
2937 * contain"; this is presumably an oversight, since there is no
2938 * reasonable way to interpolate a fragment shader input that contains
2939 * an integer. See Khronos bug #15671.
2941 if (state
->is_version(130, 300)
2942 && var_type
->contains_integer()
2943 && interpolation
!= INTERP_MODE_FLAT
2944 && ((state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_in
)
2945 || (state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_out
2946 && state
->es_shader
))) {
2947 const char *shader_var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
2948 "vertex output" : "fragment input";
2949 _mesa_glsl_error(loc
, state
, "if a %s is (or contains) "
2950 "an integer, then it must be qualified with 'flat'",
2954 /* Double fragment inputs must be qualified with 'flat'.
2956 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
2957 * "This extension does not support interpolation of double-precision
2958 * values; doubles used as fragment shader inputs must be qualified as
2961 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
2962 * "Fragment shader inputs that are signed or unsigned integers, integer
2963 * vectors, or any double-precision floating-point type must be
2964 * qualified with the interpolation qualifier flat."
2966 * Note that the GLSL specs are missing the text "or contain"; this is
2967 * presumably an oversight. See Khronos bug #15671.
2969 * The 'double' type does not exist in GLSL ES so far.
2971 if (state
->has_double()
2972 && var_type
->contains_double()
2973 && interpolation
!= INTERP_MODE_FLAT
2974 && state
->stage
== MESA_SHADER_FRAGMENT
2975 && mode
== ir_var_shader_in
) {
2976 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
2977 "a double, then it must be qualified with 'flat'");
2981 static glsl_interp_mode
2982 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2983 const struct glsl_type
*var_type
,
2984 ir_variable_mode mode
,
2985 struct _mesa_glsl_parse_state
*state
,
2988 glsl_interp_mode interpolation
;
2989 if (qual
->flags
.q
.flat
)
2990 interpolation
= INTERP_MODE_FLAT
;
2991 else if (qual
->flags
.q
.noperspective
)
2992 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
2993 else if (qual
->flags
.q
.smooth
)
2994 interpolation
= INTERP_MODE_SMOOTH
;
2995 else if (state
->es_shader
&&
2996 ((mode
== ir_var_shader_in
&&
2997 state
->stage
!= MESA_SHADER_VERTEX
) ||
2998 (mode
== ir_var_shader_out
&&
2999 state
->stage
!= MESA_SHADER_FRAGMENT
)))
3000 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
3002 * "When no interpolation qualifier is present, smooth interpolation
3005 interpolation
= INTERP_MODE_SMOOTH
;
3007 interpolation
= INTERP_MODE_NONE
;
3009 validate_interpolation_qualifier(state
, loc
,
3011 qual
, var_type
, mode
);
3013 return interpolation
;
3018 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3020 struct _mesa_glsl_parse_state
*state
,
3025 unsigned qual_location
;
3026 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3031 /* Checks for GL_ARB_explicit_uniform_location. */
3032 if (qual
->flags
.q
.uniform
) {
3033 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3036 const struct gl_context
*const ctx
= state
->ctx
;
3037 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3039 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3040 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3041 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3042 ctx
->Const
.MaxUserAssignableUniformLocations
);
3046 var
->data
.explicit_location
= true;
3047 var
->data
.location
= qual_location
;
3051 /* Between GL_ARB_explicit_attrib_location an
3052 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3053 * stage can be assigned explicit locations. The checking here associates
3054 * the correct extension with the correct stage's input / output:
3058 * vertex explicit_loc sso
3059 * tess control sso sso
3062 * fragment sso explicit_loc
3064 switch (state
->stage
) {
3065 case MESA_SHADER_VERTEX
:
3066 if (var
->data
.mode
== ir_var_shader_in
) {
3067 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3073 if (var
->data
.mode
== ir_var_shader_out
) {
3074 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3083 case MESA_SHADER_TESS_CTRL
:
3084 case MESA_SHADER_TESS_EVAL
:
3085 case MESA_SHADER_GEOMETRY
:
3086 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3087 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3096 case MESA_SHADER_FRAGMENT
:
3097 if (var
->data
.mode
== ir_var_shader_in
) {
3098 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3104 if (var
->data
.mode
== ir_var_shader_out
) {
3105 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3114 case MESA_SHADER_COMPUTE
:
3115 _mesa_glsl_error(loc
, state
,
3116 "compute shader variables cannot be given "
3117 "explicit locations");
3122 _mesa_glsl_error(loc
, state
,
3123 "%s cannot be given an explicit location in %s shader",
3125 _mesa_shader_stage_to_string(state
->stage
));
3127 var
->data
.explicit_location
= true;
3129 switch (state
->stage
) {
3130 case MESA_SHADER_VERTEX
:
3131 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3132 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3133 : (qual_location
+ VARYING_SLOT_VAR0
);
3136 case MESA_SHADER_TESS_CTRL
:
3137 case MESA_SHADER_TESS_EVAL
:
3138 case MESA_SHADER_GEOMETRY
:
3139 if (var
->data
.patch
)
3140 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3142 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3145 case MESA_SHADER_FRAGMENT
:
3146 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3147 ? (qual_location
+ FRAG_RESULT_DATA0
)
3148 : (qual_location
+ VARYING_SLOT_VAR0
);
3150 case MESA_SHADER_COMPUTE
:
3151 assert(!"Unexpected shader type");
3155 /* Check if index was set for the uniform instead of the function */
3156 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
3157 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3158 "used with subroutine functions");
3162 unsigned qual_index
;
3163 if (qual
->flags
.q
.explicit_index
&&
3164 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3166 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3167 * Layout Qualifiers):
3169 * "It is also a compile-time error if a fragment shader
3170 * sets a layout index to less than 0 or greater than 1."
3172 * Older specifications don't mandate a behavior; we take
3173 * this as a clarification and always generate the error.
3175 if (qual_index
> 1) {
3176 _mesa_glsl_error(loc
, state
,
3177 "explicit index may only be 0 or 1");
3179 var
->data
.explicit_index
= true;
3180 var
->data
.index
= qual_index
;
3187 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3189 struct _mesa_glsl_parse_state
*state
,
3192 const glsl_type
*base_type
= var
->type
->without_array();
3194 if (base_type
->is_image()) {
3195 if (var
->data
.mode
!= ir_var_uniform
&&
3196 var
->data
.mode
!= ir_var_function_in
) {
3197 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
3198 "function parameters or uniform-qualified "
3199 "global variables");
3202 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
3203 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
3204 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
3205 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
3206 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
3207 var
->data
.read_only
= true;
3209 if (qual
->flags
.q
.explicit_image_format
) {
3210 if (var
->data
.mode
== ir_var_function_in
) {
3211 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
3212 "used on image function parameters");
3215 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3216 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
3217 "base data type of the image");
3220 var
->data
.image_format
= qual
->image_format
;
3222 if (var
->data
.mode
== ir_var_uniform
) {
3223 if (state
->es_shader
) {
3224 _mesa_glsl_error(loc
, state
, "all image uniforms "
3225 "must have a format layout qualifier");
3227 } else if (!qual
->flags
.q
.write_only
) {
3228 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3229 "`writeonly' must have a format layout "
3234 var
->data
.image_format
= GL_NONE
;
3237 /* From page 70 of the GLSL ES 3.1 specification:
3239 * "Except for image variables qualified with the format qualifiers
3240 * r32f, r32i, and r32ui, image variables must specify either memory
3241 * qualifier readonly or the memory qualifier writeonly."
3243 if (state
->es_shader
&&
3244 var
->data
.image_format
!= GL_R32F
&&
3245 var
->data
.image_format
!= GL_R32I
&&
3246 var
->data
.image_format
!= GL_R32UI
&&
3247 !var
->data
.image_read_only
&&
3248 !var
->data
.image_write_only
) {
3249 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3250 "r32f, r32i or r32ui must be qualified `readonly' or "
3254 } else if (qual
->flags
.q
.read_only
||
3255 qual
->flags
.q
.write_only
||
3256 qual
->flags
.q
.coherent
||
3257 qual
->flags
.q
._volatile
||
3258 qual
->flags
.q
.restrict_flag
||
3259 qual
->flags
.q
.explicit_image_format
) {
3260 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3265 static inline const char*
3266 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3268 if (origin_upper_left
&& pixel_center_integer
)
3269 return "origin_upper_left, pixel_center_integer";
3270 else if (origin_upper_left
)
3271 return "origin_upper_left";
3272 else if (pixel_center_integer
)
3273 return "pixel_center_integer";
3279 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3280 const struct ast_type_qualifier
*qual
)
3282 /* If gl_FragCoord was previously declared, and the qualifiers were
3283 * different in any way, return true.
3285 if (state
->fs_redeclares_gl_fragcoord
) {
3286 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3287 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3294 validate_array_dimensions(const glsl_type
*t
,
3295 struct _mesa_glsl_parse_state
*state
,
3297 if (t
->is_array()) {
3298 t
= t
->fields
.array
;
3299 while (t
->is_array()) {
3300 if (t
->is_unsized_array()) {
3301 _mesa_glsl_error(loc
, state
,
3302 "only the outermost array dimension can "
3307 t
= t
->fields
.array
;
3313 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3315 struct _mesa_glsl_parse_state
*state
,
3318 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3320 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3322 * "Within any shader, the first redeclarations of gl_FragCoord
3323 * must appear before any use of gl_FragCoord."
3325 * Generate a compiler error if above condition is not met by the
3328 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3329 if (earlier
!= NULL
&&
3330 earlier
->data
.used
&&
3331 !state
->fs_redeclares_gl_fragcoord
) {
3332 _mesa_glsl_error(loc
, state
,
3333 "gl_FragCoord used before its first redeclaration "
3334 "in fragment shader");
3337 /* Make sure all gl_FragCoord redeclarations specify the same layout
3340 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3341 const char *const qual_string
=
3342 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3343 qual
->flags
.q
.pixel_center_integer
);
3345 const char *const state_string
=
3346 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3347 state
->fs_pixel_center_integer
);
3349 _mesa_glsl_error(loc
, state
,
3350 "gl_FragCoord redeclared with different layout "
3351 "qualifiers (%s) and (%s) ",
3355 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3356 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3357 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3358 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3359 state
->fs_redeclares_gl_fragcoord
=
3360 state
->fs_origin_upper_left
||
3361 state
->fs_pixel_center_integer
||
3362 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3365 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3366 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3367 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3368 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3369 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3370 ? "origin_upper_left" : "pixel_center_integer";
3372 _mesa_glsl_error(loc
, state
,
3373 "layout qualifier `%s' can only be applied to "
3374 "fragment shader input `gl_FragCoord'",
3378 if (qual
->flags
.q
.explicit_location
) {
3379 apply_explicit_location(qual
, var
, state
, loc
);
3381 if (qual
->flags
.q
.explicit_component
) {
3382 unsigned qual_component
;
3383 if (process_qualifier_constant(state
, loc
, "component",
3384 qual
->component
, &qual_component
)) {
3385 const glsl_type
*type
= var
->type
->without_array();
3386 unsigned components
= type
->component_slots();
3388 if (type
->is_matrix() || type
->is_record()) {
3389 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3390 "cannot be applied to a matrix, a structure, "
3391 "a block, or an array containing any of "
3393 } else if (qual_component
!= 0 &&
3394 (qual_component
+ components
- 1) > 3) {
3395 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3396 (qual_component
+ components
- 1));
3397 } else if (qual_component
== 1 && type
->is_64bit()) {
3398 /* We don't bother checking for 3 as it should be caught by the
3399 * overflow check above.
3401 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3402 "component 1 or 3");
3404 var
->data
.explicit_component
= true;
3405 var
->data
.location_frac
= qual_component
;
3409 } else if (qual
->flags
.q
.explicit_index
) {
3410 if (!qual
->flags
.q
.subroutine_def
)
3411 _mesa_glsl_error(loc
, state
,
3412 "explicit index requires explicit location");
3413 } else if (qual
->flags
.q
.explicit_component
) {
3414 _mesa_glsl_error(loc
, state
,
3415 "explicit component requires explicit location");
3418 if (qual
->flags
.q
.explicit_binding
) {
3419 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3422 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3423 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3424 unsigned qual_stream
;
3425 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3427 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3428 var
->data
.stream
= qual_stream
;
3432 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3433 unsigned qual_xfb_buffer
;
3434 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3435 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3436 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3437 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3438 if (qual
->flags
.q
.explicit_xfb_buffer
)
3439 var
->data
.explicit_xfb_buffer
= true;
3443 if (qual
->flags
.q
.explicit_xfb_offset
) {
3444 unsigned qual_xfb_offset
;
3445 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3447 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3448 qual
->offset
, &qual_xfb_offset
) &&
3449 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3450 var
->type
, component_size
)) {
3451 var
->data
.offset
= qual_xfb_offset
;
3452 var
->data
.explicit_xfb_offset
= true;
3456 if (qual
->flags
.q
.explicit_xfb_stride
) {
3457 unsigned qual_xfb_stride
;
3458 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3459 qual
->xfb_stride
, &qual_xfb_stride
)) {
3460 var
->data
.xfb_stride
= qual_xfb_stride
;
3461 var
->data
.explicit_xfb_stride
= true;
3465 if (var
->type
->contains_atomic()) {
3466 if (var
->data
.mode
== ir_var_uniform
) {
3467 if (var
->data
.explicit_binding
) {
3469 &state
->atomic_counter_offsets
[var
->data
.binding
];
3471 if (*offset
% ATOMIC_COUNTER_SIZE
)
3472 _mesa_glsl_error(loc
, state
,
3473 "misaligned atomic counter offset");
3475 var
->data
.offset
= *offset
;
3476 *offset
+= var
->type
->atomic_size();
3479 _mesa_glsl_error(loc
, state
,
3480 "atomic counters require explicit binding point");
3482 } else if (var
->data
.mode
!= ir_var_function_in
) {
3483 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3484 "function parameters or uniform-qualified "
3485 "global variables");
3489 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3490 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3491 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3492 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3493 * These extensions and all following extensions that add the 'layout'
3494 * keyword have been modified to require the use of 'in' or 'out'.
3496 * The following extension do not allow the deprecated keywords:
3498 * GL_AMD_conservative_depth
3499 * GL_ARB_conservative_depth
3500 * GL_ARB_gpu_shader5
3501 * GL_ARB_separate_shader_objects
3502 * GL_ARB_tessellation_shader
3503 * GL_ARB_transform_feedback3
3504 * GL_ARB_uniform_buffer_object
3506 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3507 * allow layout with the deprecated keywords.
3509 const bool relaxed_layout_qualifier_checking
=
3510 state
->ARB_fragment_coord_conventions_enable
;
3512 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3513 || qual
->flags
.q
.varying
;
3514 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3515 if (relaxed_layout_qualifier_checking
) {
3516 _mesa_glsl_warning(loc
, state
,
3517 "`layout' qualifier may not be used with "
3518 "`attribute' or `varying'");
3520 _mesa_glsl_error(loc
, state
,
3521 "`layout' qualifier may not be used with "
3522 "`attribute' or `varying'");
3526 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3527 * AMD_conservative_depth.
3529 int depth_layout_count
= qual
->flags
.q
.depth_any
3530 + qual
->flags
.q
.depth_greater
3531 + qual
->flags
.q
.depth_less
3532 + qual
->flags
.q
.depth_unchanged
;
3533 if (depth_layout_count
> 0
3534 && !state
->is_version(420, 0)
3535 && !state
->AMD_conservative_depth_enable
3536 && !state
->ARB_conservative_depth_enable
) {
3537 _mesa_glsl_error(loc
, state
,
3538 "extension GL_AMD_conservative_depth or "
3539 "GL_ARB_conservative_depth must be enabled "
3540 "to use depth layout qualifiers");
3541 } else if (depth_layout_count
> 0
3542 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3543 _mesa_glsl_error(loc
, state
,
3544 "depth layout qualifiers can be applied only to "
3546 } else if (depth_layout_count
> 1
3547 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3548 _mesa_glsl_error(loc
, state
,
3549 "at most one depth layout qualifier can be applied to "
3552 if (qual
->flags
.q
.depth_any
)
3553 var
->data
.depth_layout
= ir_depth_layout_any
;
3554 else if (qual
->flags
.q
.depth_greater
)
3555 var
->data
.depth_layout
= ir_depth_layout_greater
;
3556 else if (qual
->flags
.q
.depth_less
)
3557 var
->data
.depth_layout
= ir_depth_layout_less
;
3558 else if (qual
->flags
.q
.depth_unchanged
)
3559 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3561 var
->data
.depth_layout
= ir_depth_layout_none
;
3563 if (qual
->flags
.q
.std140
||
3564 qual
->flags
.q
.std430
||
3565 qual
->flags
.q
.packed
||
3566 qual
->flags
.q
.shared
) {
3567 _mesa_glsl_error(loc
, state
,
3568 "uniform and shader storage block layout qualifiers "
3569 "std140, std430, packed, and shared can only be "
3570 "applied to uniform or shader storage blocks, not "
3574 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3575 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3578 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3581 * "Fragment shaders also allow the following layout qualifier on in only
3582 * (not with variable declarations)
3583 * layout-qualifier-id
3584 * early_fragment_tests
3587 if (qual
->flags
.q
.early_fragment_tests
) {
3588 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3589 "valid in fragment shader input layout declaration.");
3594 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3596 struct _mesa_glsl_parse_state
*state
,
3600 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3602 if (qual
->flags
.q
.invariant
) {
3603 if (var
->data
.used
) {
3604 _mesa_glsl_error(loc
, state
,
3605 "variable `%s' may not be redeclared "
3606 "`invariant' after being used",
3609 var
->data
.invariant
= 1;
3613 if (qual
->flags
.q
.precise
) {
3614 if (var
->data
.used
) {
3615 _mesa_glsl_error(loc
, state
,
3616 "variable `%s' may not be redeclared "
3617 "`precise' after being used",
3620 var
->data
.precise
= 1;
3624 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3625 _mesa_glsl_error(loc
, state
,
3626 "`subroutine' may only be applied to uniforms, "
3627 "subroutine type declarations, or function definitions");
3630 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3631 || qual
->flags
.q
.uniform
3632 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3633 var
->data
.read_only
= 1;
3635 if (qual
->flags
.q
.centroid
)
3636 var
->data
.centroid
= 1;
3638 if (qual
->flags
.q
.sample
)
3639 var
->data
.sample
= 1;
3641 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3642 if (state
->es_shader
) {
3643 var
->data
.precision
=
3644 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3647 if (qual
->flags
.q
.patch
)
3648 var
->data
.patch
= 1;
3650 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3651 var
->type
= glsl_type::error_type
;
3652 _mesa_glsl_error(loc
, state
,
3653 "`attribute' variables may not be declared in the "
3655 _mesa_shader_stage_to_string(state
->stage
));
3658 /* Disallow layout qualifiers which may only appear on layout declarations. */
3659 if (qual
->flags
.q
.prim_type
) {
3660 _mesa_glsl_error(loc
, state
,
3661 "Primitive type may only be specified on GS input or output "
3662 "layout declaration, not on variables.");
3665 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3667 * "However, the const qualifier cannot be used with out or inout."
3669 * The same section of the GLSL 4.40 spec further clarifies this saying:
3671 * "The const qualifier cannot be used with out or inout, or a
3672 * compile-time error results."
3674 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3675 _mesa_glsl_error(loc
, state
,
3676 "`const' may not be applied to `out' or `inout' "
3677 "function parameters");
3680 /* If there is no qualifier that changes the mode of the variable, leave
3681 * the setting alone.
3683 assert(var
->data
.mode
!= ir_var_temporary
);
3684 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3685 var
->data
.mode
= ir_var_function_inout
;
3686 else if (qual
->flags
.q
.in
)
3687 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3688 else if (qual
->flags
.q
.attribute
3689 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3690 var
->data
.mode
= ir_var_shader_in
;
3691 else if (qual
->flags
.q
.out
)
3692 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3693 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3694 var
->data
.mode
= ir_var_shader_out
;
3695 else if (qual
->flags
.q
.uniform
)
3696 var
->data
.mode
= ir_var_uniform
;
3697 else if (qual
->flags
.q
.buffer
)
3698 var
->data
.mode
= ir_var_shader_storage
;
3699 else if (qual
->flags
.q
.shared_storage
)
3700 var
->data
.mode
= ir_var_shader_shared
;
3702 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3703 /* User-defined ins/outs are not permitted in compute shaders. */
3704 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3705 _mesa_glsl_error(loc
, state
,
3706 "user-defined input and output variables are not "
3707 "permitted in compute shaders");
3710 /* This variable is being used to link data between shader stages (in
3711 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3712 * that is allowed for such purposes.
3714 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3716 * "The varying qualifier can be used only with the data types
3717 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3720 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3721 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3723 * "Fragment inputs can only be signed and unsigned integers and
3724 * integer vectors, float, floating-point vectors, matrices, or
3725 * arrays of these. Structures cannot be input.
3727 * Similar text exists in the section on vertex shader outputs.
3729 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3730 * 3.00 spec allows structs as well. Varying structs are also allowed
3733 switch (var
->type
->get_scalar_type()->base_type
) {
3734 case GLSL_TYPE_FLOAT
:
3735 /* Ok in all GLSL versions */
3737 case GLSL_TYPE_UINT
:
3739 if (state
->is_version(130, 300))
3741 _mesa_glsl_error(loc
, state
,
3742 "varying variables must be of base type float in %s",
3743 state
->get_version_string());
3745 case GLSL_TYPE_STRUCT
:
3746 if (state
->is_version(150, 300))
3748 _mesa_glsl_error(loc
, state
,
3749 "varying variables may not be of type struct");
3751 case GLSL_TYPE_DOUBLE
:
3754 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3759 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3760 switch (state
->stage
) {
3761 case MESA_SHADER_VERTEX
:
3762 if (var
->data
.mode
== ir_var_shader_out
)
3763 var
->data
.invariant
= true;
3765 case MESA_SHADER_TESS_CTRL
:
3766 case MESA_SHADER_TESS_EVAL
:
3767 case MESA_SHADER_GEOMETRY
:
3768 if ((var
->data
.mode
== ir_var_shader_in
)
3769 || (var
->data
.mode
== ir_var_shader_out
))
3770 var
->data
.invariant
= true;
3772 case MESA_SHADER_FRAGMENT
:
3773 if (var
->data
.mode
== ir_var_shader_in
)
3774 var
->data
.invariant
= true;
3776 case MESA_SHADER_COMPUTE
:
3777 /* Invariance isn't meaningful in compute shaders. */
3782 var
->data
.interpolation
=
3783 interpret_interpolation_qualifier(qual
, var
->type
,
3784 (ir_variable_mode
) var
->data
.mode
,
3787 /* Does the declaration use the deprecated 'attribute' or 'varying'
3790 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3791 || qual
->flags
.q
.varying
;
3794 /* Validate auxiliary storage qualifiers */
3796 /* From section 4.3.4 of the GLSL 1.30 spec:
3797 * "It is an error to use centroid in in a vertex shader."
3799 * From section 4.3.4 of the GLSL ES 3.00 spec:
3800 * "It is an error to use centroid in or interpolation qualifiers in
3801 * a vertex shader input."
3804 /* Section 4.3.6 of the GLSL 1.30 specification states:
3805 * "It is an error to use centroid out in a fragment shader."
3807 * The GL_ARB_shading_language_420pack extension specification states:
3808 * "It is an error to use auxiliary storage qualifiers or interpolation
3809 * qualifiers on an output in a fragment shader."
3811 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3812 _mesa_glsl_error(loc
, state
,
3813 "sample qualifier may only be used on `in` or `out` "
3814 "variables between shader stages");
3816 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3817 _mesa_glsl_error(loc
, state
,
3818 "centroid qualifier may only be used with `in', "
3819 "`out' or `varying' variables between shader stages");
3822 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3823 _mesa_glsl_error(loc
, state
,
3824 "the shared storage qualifiers can only be used with "
3828 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3832 * Get the variable that is being redeclared by this declaration
3834 * Semantic checks to verify the validity of the redeclaration are also
3835 * performed. If semantic checks fail, compilation error will be emitted via
3836 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3839 * A pointer to an existing variable in the current scope if the declaration
3840 * is a redeclaration, \c NULL otherwise.
3842 static ir_variable
*
3843 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3844 struct _mesa_glsl_parse_state
*state
,
3845 bool allow_all_redeclarations
)
3847 /* Check if this declaration is actually a re-declaration, either to
3848 * resize an array or add qualifiers to an existing variable.
3850 * This is allowed for variables in the current scope, or when at
3851 * global scope (for built-ins in the implicit outer scope).
3853 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3854 if (earlier
== NULL
||
3855 (state
->current_function
!= NULL
&&
3856 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3861 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3863 * "It is legal to declare an array without a size and then
3864 * later re-declare the same name as an array of the same
3865 * type and specify a size."
3867 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3868 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3869 /* FINISHME: This doesn't match the qualifiers on the two
3870 * FINISHME: declarations. It's not 100% clear whether this is
3871 * FINISHME: required or not.
3874 const int size
= var
->type
->array_size();
3875 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3876 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3877 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3879 earlier
->data
.max_array_access
);
3882 earlier
->type
= var
->type
;
3885 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3886 state
->is_version(150, 0))
3887 && strcmp(var
->name
, "gl_FragCoord") == 0
3888 && earlier
->type
== var
->type
3889 && var
->data
.mode
== ir_var_shader_in
) {
3890 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3893 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3894 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3896 /* According to section 4.3.7 of the GLSL 1.30 spec,
3897 * the following built-in varaibles can be redeclared with an
3898 * interpolation qualifier:
3901 * * gl_FrontSecondaryColor
3902 * * gl_BackSecondaryColor
3904 * * gl_SecondaryColor
3906 } else if (state
->is_version(130, 0)
3907 && (strcmp(var
->name
, "gl_FrontColor") == 0
3908 || strcmp(var
->name
, "gl_BackColor") == 0
3909 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3910 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3911 || strcmp(var
->name
, "gl_Color") == 0
3912 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3913 && earlier
->type
== var
->type
3914 && earlier
->data
.mode
== var
->data
.mode
) {
3915 earlier
->data
.interpolation
= var
->data
.interpolation
;
3917 /* Layout qualifiers for gl_FragDepth. */
3918 } else if ((state
->is_version(420, 0) ||
3919 state
->AMD_conservative_depth_enable
||
3920 state
->ARB_conservative_depth_enable
)
3921 && strcmp(var
->name
, "gl_FragDepth") == 0
3922 && earlier
->type
== var
->type
3923 && earlier
->data
.mode
== var
->data
.mode
) {
3925 /** From the AMD_conservative_depth spec:
3926 * Within any shader, the first redeclarations of gl_FragDepth
3927 * must appear before any use of gl_FragDepth.
3929 if (earlier
->data
.used
) {
3930 _mesa_glsl_error(&loc
, state
,
3931 "the first redeclaration of gl_FragDepth "
3932 "must appear before any use of gl_FragDepth");
3935 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3936 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3937 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3938 _mesa_glsl_error(&loc
, state
,
3939 "gl_FragDepth: depth layout is declared here "
3940 "as '%s, but it was previously declared as "
3942 depth_layout_string(var
->data
.depth_layout
),
3943 depth_layout_string(earlier
->data
.depth_layout
));
3946 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3948 } else if (allow_all_redeclarations
) {
3949 if (earlier
->data
.mode
!= var
->data
.mode
) {
3950 _mesa_glsl_error(&loc
, state
,
3951 "redeclaration of `%s' with incorrect qualifiers",
3953 } else if (earlier
->type
!= var
->type
) {
3954 _mesa_glsl_error(&loc
, state
,
3955 "redeclaration of `%s' has incorrect type",
3959 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3966 * Generate the IR for an initializer in a variable declaration
3969 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3970 ast_fully_specified_type
*type
,
3971 exec_list
*initializer_instructions
,
3972 struct _mesa_glsl_parse_state
*state
)
3974 ir_rvalue
*result
= NULL
;
3976 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3978 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3980 * "All uniform variables are read-only and are initialized either
3981 * directly by an application via API commands, or indirectly by
3984 if (var
->data
.mode
== ir_var_uniform
) {
3985 state
->check_version(120, 0, &initializer_loc
,
3986 "cannot initialize uniform %s",
3990 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3992 * "Buffer variables cannot have initializers."
3994 if (var
->data
.mode
== ir_var_shader_storage
) {
3995 _mesa_glsl_error(&initializer_loc
, state
,
3996 "cannot initialize buffer variable %s",
4000 /* From section 4.1.7 of the GLSL 4.40 spec:
4002 * "Opaque variables [...] are initialized only through the
4003 * OpenGL API; they cannot be declared with an initializer in a
4006 if (var
->type
->contains_opaque()) {
4007 _mesa_glsl_error(&initializer_loc
, state
,
4008 "cannot initialize opaque variable %s",
4012 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4013 _mesa_glsl_error(&initializer_loc
, state
,
4014 "cannot initialize %s shader input / %s %s",
4015 _mesa_shader_stage_to_string(state
->stage
),
4016 (state
->stage
== MESA_SHADER_VERTEX
)
4017 ? "attribute" : "varying",
4021 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4022 _mesa_glsl_error(&initializer_loc
, state
,
4023 "cannot initialize %s shader output %s",
4024 _mesa_shader_stage_to_string(state
->stage
),
4028 /* If the initializer is an ast_aggregate_initializer, recursively store
4029 * type information from the LHS into it, so that its hir() function can do
4032 if (decl
->initializer
->oper
== ast_aggregate
)
4033 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4035 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4036 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4038 /* Calculate the constant value if this is a const or uniform
4041 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4043 * "Declarations of globals without a storage qualifier, or with
4044 * just the const qualifier, may include initializers, in which case
4045 * they will be initialized before the first line of main() is
4046 * executed. Such initializers must be a constant expression."
4048 * The same section of the GLSL ES 3.00.4 spec has similar language.
4050 if (type
->qualifier
.flags
.q
.constant
4051 || type
->qualifier
.flags
.q
.uniform
4052 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4053 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4055 if (new_rhs
!= NULL
) {
4058 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4061 * "A constant expression is one of
4065 * - an expression formed by an operator on operands that are
4066 * all constant expressions, including getting an element of
4067 * a constant array, or a field of a constant structure, or
4068 * components of a constant vector. However, the sequence
4069 * operator ( , ) and the assignment operators ( =, +=, ...)
4070 * are not included in the operators that can create a
4071 * constant expression."
4073 * Section 12.43 (Sequence operator and constant expressions) says:
4075 * "Should the following construct be allowed?
4079 * The expression within the brackets uses the sequence operator
4080 * (',') and returns the integer 3 so the construct is declaring
4081 * a single-dimensional array of size 3. In some languages, the
4082 * construct declares a two-dimensional array. It would be
4083 * preferable to make this construct illegal to avoid confusion.
4085 * One possibility is to change the definition of the sequence
4086 * operator so that it does not return a constant-expression and
4087 * hence cannot be used to declare an array size.
4089 * RESOLUTION: The result of a sequence operator is not a
4090 * constant-expression."
4092 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4093 * contains language almost identical to the section 4.3.3 in the
4094 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4097 ir_constant
*constant_value
= rhs
->constant_expression_value();
4098 if (!constant_value
||
4099 (state
->is_version(430, 300) &&
4100 decl
->initializer
->has_sequence_subexpression())) {
4101 const char *const variable_mode
=
4102 (type
->qualifier
.flags
.q
.constant
)
4104 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4106 /* If ARB_shading_language_420pack is enabled, initializers of
4107 * const-qualified local variables do not have to be constant
4108 * expressions. Const-qualified global variables must still be
4109 * initialized with constant expressions.
4111 if (!state
->has_420pack()
4112 || state
->current_function
== NULL
) {
4113 _mesa_glsl_error(& initializer_loc
, state
,
4114 "initializer of %s variable `%s' must be a "
4115 "constant expression",
4118 if (var
->type
->is_numeric()) {
4119 /* Reduce cascading errors. */
4120 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4121 ? ir_constant::zero(state
, var
->type
) : NULL
;
4125 rhs
= constant_value
;
4126 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4127 ? constant_value
: NULL
;
4130 if (var
->type
->is_numeric()) {
4131 /* Reduce cascading errors. */
4132 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4133 ? ir_constant::zero(state
, var
->type
) : NULL
;
4138 if (rhs
&& !rhs
->type
->is_error()) {
4139 bool temp
= var
->data
.read_only
;
4140 if (type
->qualifier
.flags
.q
.constant
)
4141 var
->data
.read_only
= false;
4143 /* Never emit code to initialize a uniform.
4145 const glsl_type
*initializer_type
;
4146 if (!type
->qualifier
.flags
.q
.uniform
) {
4147 do_assignment(initializer_instructions
, state
,
4152 type
->get_location());
4153 initializer_type
= result
->type
;
4155 initializer_type
= rhs
->type
;
4157 var
->constant_initializer
= rhs
->constant_expression_value();
4158 var
->data
.has_initializer
= true;
4160 /* If the declared variable is an unsized array, it must inherrit
4161 * its full type from the initializer. A declaration such as
4163 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4167 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4169 * The assignment generated in the if-statement (below) will also
4170 * automatically handle this case for non-uniforms.
4172 * If the declared variable is not an array, the types must
4173 * already match exactly. As a result, the type assignment
4174 * here can be done unconditionally. For non-uniforms the call
4175 * to do_assignment can change the type of the initializer (via
4176 * the implicit conversion rules). For uniforms the initializer
4177 * must be a constant expression, and the type of that expression
4178 * was validated above.
4180 var
->type
= initializer_type
;
4182 var
->data
.read_only
= temp
;
4189 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4190 YYLTYPE loc
, ir_variable
*var
,
4191 unsigned num_vertices
,
4193 const char *var_category
)
4195 if (var
->type
->is_unsized_array()) {
4196 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4198 * All geometry shader input unsized array declarations will be
4199 * sized by an earlier input layout qualifier, when present, as per
4200 * the following table.
4202 * Followed by a table mapping each allowed input layout qualifier to
4203 * the corresponding input length.
4205 * Similarly for tessellation control shader outputs.
4207 if (num_vertices
!= 0)
4208 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4211 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4212 * includes the following examples of compile-time errors:
4214 * // code sequence within one shader...
4215 * in vec4 Color1[]; // size unknown
4216 * ...Color1.length()...// illegal, length() unknown
4217 * in vec4 Color2[2]; // size is 2
4218 * ...Color1.length()...// illegal, Color1 still has no size
4219 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4220 * layout(lines) in; // legal, input size is 2, matching
4221 * in vec4 Color4[3]; // illegal, contradicts layout
4224 * To detect the case illustrated by Color3, we verify that the size of
4225 * an explicitly-sized array matches the size of any previously declared
4226 * explicitly-sized array. To detect the case illustrated by Color4, we
4227 * verify that the size of an explicitly-sized array is consistent with
4228 * any previously declared input layout.
4230 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4231 _mesa_glsl_error(&loc
, state
,
4232 "%s size contradicts previously declared layout "
4233 "(size is %u, but layout requires a size of %u)",
4234 var_category
, var
->type
->length
, num_vertices
);
4235 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4236 _mesa_glsl_error(&loc
, state
,
4237 "%s sizes are inconsistent (size is %u, but a "
4238 "previous declaration has size %u)",
4239 var_category
, var
->type
->length
, *size
);
4241 *size
= var
->type
->length
;
4247 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4248 YYLTYPE loc
, ir_variable
*var
)
4250 unsigned num_vertices
= 0;
4252 if (state
->tcs_output_vertices_specified
) {
4253 if (!state
->out_qualifier
->vertices
->
4254 process_qualifier_constant(state
, "vertices",
4255 &num_vertices
, false)) {
4259 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4260 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4261 "GL_MAX_PATCH_VERTICES", num_vertices
);
4266 if (!var
->type
->is_array() && !var
->data
.patch
) {
4267 _mesa_glsl_error(&loc
, state
,
4268 "tessellation control shader outputs must be arrays");
4270 /* To avoid cascading failures, short circuit the checks below. */
4274 if (var
->data
.patch
)
4277 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4278 &state
->tcs_output_size
,
4279 "tessellation control shader output");
4283 * Do additional processing necessary for tessellation control/evaluation shader
4284 * input declarations. This covers both interface block arrays and bare input
4288 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4289 YYLTYPE loc
, ir_variable
*var
)
4291 if (!var
->type
->is_array() && !var
->data
.patch
) {
4292 _mesa_glsl_error(&loc
, state
,
4293 "per-vertex tessellation shader inputs must be arrays");
4294 /* Avoid cascading failures. */
4298 if (var
->data
.patch
)
4301 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
4302 if (var
->type
->is_unsized_array()) {
4303 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4304 state
->Const
.MaxPatchVertices
);
4310 * Do additional processing necessary for geometry shader input declarations
4311 * (this covers both interface blocks arrays and bare input variables).
4314 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4315 YYLTYPE loc
, ir_variable
*var
)
4317 unsigned num_vertices
= 0;
4319 if (state
->gs_input_prim_type_specified
) {
4320 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4323 /* Geometry shader input variables must be arrays. Caller should have
4324 * reported an error for this.
4326 if (!var
->type
->is_array()) {
4327 assert(state
->error
);
4329 /* To avoid cascading failures, short circuit the checks below. */
4333 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4334 &state
->gs_input_size
,
4335 "geometry shader input");
4339 validate_identifier(const char *identifier
, YYLTYPE loc
,
4340 struct _mesa_glsl_parse_state
*state
)
4342 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4344 * "Identifiers starting with "gl_" are reserved for use by
4345 * OpenGL, and may not be declared in a shader as either a
4346 * variable or a function."
4348 if (is_gl_identifier(identifier
)) {
4349 _mesa_glsl_error(&loc
, state
,
4350 "identifier `%s' uses reserved `gl_' prefix",
4352 } else if (strstr(identifier
, "__")) {
4353 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4356 * "In addition, all identifiers containing two
4357 * consecutive underscores (__) are reserved as
4358 * possible future keywords."
4360 * The intention is that names containing __ are reserved for internal
4361 * use by the implementation, and names prefixed with GL_ are reserved
4362 * for use by Khronos. Names simply containing __ are dangerous to use,
4363 * but should be allowed.
4365 * A future version of the GLSL specification will clarify this.
4367 _mesa_glsl_warning(&loc
, state
,
4368 "identifier `%s' uses reserved `__' string",
4374 ast_declarator_list::hir(exec_list
*instructions
,
4375 struct _mesa_glsl_parse_state
*state
)
4378 const struct glsl_type
*decl_type
;
4379 const char *type_name
= NULL
;
4380 ir_rvalue
*result
= NULL
;
4381 YYLTYPE loc
= this->get_location();
4383 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4385 * "To ensure that a particular output variable is invariant, it is
4386 * necessary to use the invariant qualifier. It can either be used to
4387 * qualify a previously declared variable as being invariant
4389 * invariant gl_Position; // make existing gl_Position be invariant"
4391 * In these cases the parser will set the 'invariant' flag in the declarator
4392 * list, and the type will be NULL.
4394 if (this->invariant
) {
4395 assert(this->type
== NULL
);
4397 if (state
->current_function
!= NULL
) {
4398 _mesa_glsl_error(& loc
, state
,
4399 "all uses of `invariant' keyword must be at global "
4403 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4404 assert(decl
->array_specifier
== NULL
);
4405 assert(decl
->initializer
== NULL
);
4407 ir_variable
*const earlier
=
4408 state
->symbols
->get_variable(decl
->identifier
);
4409 if (earlier
== NULL
) {
4410 _mesa_glsl_error(& loc
, state
,
4411 "undeclared variable `%s' cannot be marked "
4412 "invariant", decl
->identifier
);
4413 } else if (!is_varying_var(earlier
, state
->stage
)) {
4414 _mesa_glsl_error(&loc
, state
,
4415 "`%s' cannot be marked invariant; interfaces between "
4416 "shader stages only.", decl
->identifier
);
4417 } else if (earlier
->data
.used
) {
4418 _mesa_glsl_error(& loc
, state
,
4419 "variable `%s' may not be redeclared "
4420 "`invariant' after being used",
4423 earlier
->data
.invariant
= true;
4427 /* Invariant redeclarations do not have r-values.
4432 if (this->precise
) {
4433 assert(this->type
== NULL
);
4435 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4436 assert(decl
->array_specifier
== NULL
);
4437 assert(decl
->initializer
== NULL
);
4439 ir_variable
*const earlier
=
4440 state
->symbols
->get_variable(decl
->identifier
);
4441 if (earlier
== NULL
) {
4442 _mesa_glsl_error(& loc
, state
,
4443 "undeclared variable `%s' cannot be marked "
4444 "precise", decl
->identifier
);
4445 } else if (state
->current_function
!= NULL
&&
4446 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4447 /* Note: we have to check if we're in a function, since
4448 * builtins are treated as having come from another scope.
4450 _mesa_glsl_error(& loc
, state
,
4451 "variable `%s' from an outer scope may not be "
4452 "redeclared `precise' in this scope",
4454 } else if (earlier
->data
.used
) {
4455 _mesa_glsl_error(& loc
, state
,
4456 "variable `%s' may not be redeclared "
4457 "`precise' after being used",
4460 earlier
->data
.precise
= true;
4464 /* Precise redeclarations do not have r-values either. */
4468 assert(this->type
!= NULL
);
4469 assert(!this->invariant
);
4470 assert(!this->precise
);
4472 /* The type specifier may contain a structure definition. Process that
4473 * before any of the variable declarations.
4475 (void) this->type
->specifier
->hir(instructions
, state
);
4477 decl_type
= this->type
->glsl_type(& type_name
, state
);
4479 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4480 * "Buffer variables may only be declared inside interface blocks
4481 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4482 * shader storage blocks. It is a compile-time error to declare buffer
4483 * variables at global scope (outside a block)."
4485 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4486 _mesa_glsl_error(&loc
, state
,
4487 "buffer variables cannot be declared outside "
4488 "interface blocks");
4491 /* An offset-qualified atomic counter declaration sets the default
4492 * offset for the next declaration within the same atomic counter
4495 if (decl_type
&& decl_type
->contains_atomic()) {
4496 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4497 type
->qualifier
.flags
.q
.explicit_offset
) {
4498 unsigned qual_binding
;
4499 unsigned qual_offset
;
4500 if (process_qualifier_constant(state
, &loc
, "binding",
4501 type
->qualifier
.binding
,
4503 && process_qualifier_constant(state
, &loc
, "offset",
4504 type
->qualifier
.offset
,
4506 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4510 ast_type_qualifier allowed_atomic_qual_mask
;
4511 allowed_atomic_qual_mask
.flags
.i
= 0;
4512 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4513 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4514 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4516 type
->qualifier
.validate_flags(&loc
, state
,
4517 "invalid layout qualifier for "
4519 allowed_atomic_qual_mask
);
4522 if (this->declarations
.is_empty()) {
4523 /* If there is no structure involved in the program text, there are two
4524 * possible scenarios:
4526 * - The program text contained something like 'vec4;'. This is an
4527 * empty declaration. It is valid but weird. Emit a warning.
4529 * - The program text contained something like 'S;' and 'S' is not the
4530 * name of a known structure type. This is both invalid and weird.
4533 * - The program text contained something like 'mediump float;'
4534 * when the programmer probably meant 'precision mediump
4535 * float;' Emit a warning with a description of what they
4536 * probably meant to do.
4538 * Note that if decl_type is NULL and there is a structure involved,
4539 * there must have been some sort of error with the structure. In this
4540 * case we assume that an error was already generated on this line of
4541 * code for the structure. There is no need to generate an additional,
4544 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4547 if (decl_type
== NULL
) {
4548 _mesa_glsl_error(&loc
, state
,
4549 "invalid type `%s' in empty declaration",
4552 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4553 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4556 * "... any declaration that leaves the size undefined is
4557 * disallowed as this would add complexity and there are no
4560 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4561 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4562 "or implicitly defined");
4565 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4567 * "The combinations of types and qualifiers that cause
4568 * compile-time or link-time errors are the same whether or not
4569 * the declaration is empty."
4571 validate_array_dimensions(decl_type
, state
, &loc
);
4574 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4575 /* Empty atomic counter declarations are allowed and useful
4576 * to set the default offset qualifier.
4579 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4580 if (this->type
->specifier
->structure
!= NULL
) {
4581 _mesa_glsl_error(&loc
, state
,
4582 "precision qualifiers can't be applied "
4585 static const char *const precision_names
[] = {
4592 _mesa_glsl_warning(&loc
, state
,
4593 "empty declaration with precision "
4594 "qualifier, to set the default precision, "
4595 "use `precision %s %s;'",
4596 precision_names
[this->type
->
4597 qualifier
.precision
],
4600 } else if (this->type
->specifier
->structure
== NULL
) {
4601 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4606 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4607 const struct glsl_type
*var_type
;
4609 const char *identifier
= decl
->identifier
;
4610 /* FINISHME: Emit a warning if a variable declaration shadows a
4611 * FINISHME: declaration at a higher scope.
4614 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4615 if (type_name
!= NULL
) {
4616 _mesa_glsl_error(& loc
, state
,
4617 "invalid type `%s' in declaration of `%s'",
4618 type_name
, decl
->identifier
);
4620 _mesa_glsl_error(& loc
, state
,
4621 "invalid type in declaration of `%s'",
4627 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4631 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4633 _mesa_glsl_error(& loc
, state
,
4634 "invalid type in declaration of `%s'",
4636 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4641 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4644 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4646 /* The 'varying in' and 'varying out' qualifiers can only be used with
4647 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4650 if (this->type
->qualifier
.flags
.q
.varying
) {
4651 if (this->type
->qualifier
.flags
.q
.in
) {
4652 _mesa_glsl_error(& loc
, state
,
4653 "`varying in' qualifier in declaration of "
4654 "`%s' only valid for geometry shaders using "
4655 "ARB_geometry_shader4 or EXT_geometry_shader4",
4657 } else if (this->type
->qualifier
.flags
.q
.out
) {
4658 _mesa_glsl_error(& loc
, state
,
4659 "`varying out' qualifier in declaration of "
4660 "`%s' only valid for geometry shaders using "
4661 "ARB_geometry_shader4 or EXT_geometry_shader4",
4666 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4668 * "Global variables can only use the qualifiers const,
4669 * attribute, uniform, or varying. Only one may be
4672 * Local variables can only use the qualifier const."
4674 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4675 * any extension that adds the 'layout' keyword.
4677 if (!state
->is_version(130, 300)
4678 && !state
->has_explicit_attrib_location()
4679 && !state
->has_separate_shader_objects()
4680 && !state
->ARB_fragment_coord_conventions_enable
) {
4681 if (this->type
->qualifier
.flags
.q
.out
) {
4682 _mesa_glsl_error(& loc
, state
,
4683 "`out' qualifier in declaration of `%s' "
4684 "only valid for function parameters in %s",
4685 decl
->identifier
, state
->get_version_string());
4687 if (this->type
->qualifier
.flags
.q
.in
) {
4688 _mesa_glsl_error(& loc
, state
,
4689 "`in' qualifier in declaration of `%s' "
4690 "only valid for function parameters in %s",
4691 decl
->identifier
, state
->get_version_string());
4693 /* FINISHME: Test for other invalid qualifiers. */
4696 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4698 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4701 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
4702 && (var
->type
->is_numeric() || var
->type
->is_boolean())
4703 && state
->zero_init
) {
4704 const ir_constant_data data
= {0};
4705 var
->data
.has_initializer
= true;
4706 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
4709 if (this->type
->qualifier
.flags
.q
.invariant
) {
4710 if (!is_varying_var(var
, state
->stage
)) {
4711 _mesa_glsl_error(&loc
, state
,
4712 "`%s' cannot be marked invariant; interfaces between "
4713 "shader stages only", var
->name
);
4717 if (state
->current_function
!= NULL
) {
4718 const char *mode
= NULL
;
4719 const char *extra
= "";
4721 /* There is no need to check for 'inout' here because the parser will
4722 * only allow that in function parameter lists.
4724 if (this->type
->qualifier
.flags
.q
.attribute
) {
4726 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4727 mode
= "subroutine uniform";
4728 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4730 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4732 } else if (this->type
->qualifier
.flags
.q
.in
) {
4734 extra
= " or in function parameter list";
4735 } else if (this->type
->qualifier
.flags
.q
.out
) {
4737 extra
= " or in function parameter list";
4741 _mesa_glsl_error(& loc
, state
,
4742 "%s variable `%s' must be declared at "
4744 mode
, var
->name
, extra
);
4746 } else if (var
->data
.mode
== ir_var_shader_in
) {
4747 var
->data
.read_only
= true;
4749 if (state
->stage
== MESA_SHADER_VERTEX
) {
4750 bool error_emitted
= false;
4752 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4754 * "Vertex shader inputs can only be float, floating-point
4755 * vectors, matrices, signed and unsigned integers and integer
4756 * vectors. Vertex shader inputs can also form arrays of these
4757 * types, but not structures."
4759 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4761 * "Vertex shader inputs can only be float, floating-point
4762 * vectors, matrices, signed and unsigned integers and integer
4763 * vectors. They cannot be arrays or structures."
4765 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4767 * "The attribute qualifier can be used only with float,
4768 * floating-point vectors, and matrices. Attribute variables
4769 * cannot be declared as arrays or structures."
4771 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4773 * "Vertex shader inputs can only be float, floating-point
4774 * vectors, matrices, signed and unsigned integers and integer
4775 * vectors. Vertex shader inputs cannot be arrays or
4778 const glsl_type
*check_type
= var
->type
->without_array();
4780 switch (check_type
->base_type
) {
4781 case GLSL_TYPE_FLOAT
:
4783 case GLSL_TYPE_UINT
:
4785 if (state
->is_version(120, 300))
4787 case GLSL_TYPE_DOUBLE
:
4788 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4792 _mesa_glsl_error(& loc
, state
,
4793 "vertex shader input / attribute cannot have "
4795 var
->type
->is_array() ? "array of " : "",
4797 error_emitted
= true;
4800 if (!error_emitted
&& var
->type
->is_array() &&
4801 !state
->check_version(150, 0, &loc
,
4802 "vertex shader input / attribute "
4803 "cannot have array type")) {
4804 error_emitted
= true;
4806 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4807 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4809 * Geometry shader input variables get the per-vertex values
4810 * written out by vertex shader output variables of the same
4811 * names. Since a geometry shader operates on a set of
4812 * vertices, each input varying variable (or input block, see
4813 * interface blocks below) needs to be declared as an array.
4815 if (!var
->type
->is_array()) {
4816 _mesa_glsl_error(&loc
, state
,
4817 "geometry shader inputs must be arrays");
4820 handle_geometry_shader_input_decl(state
, loc
, var
);
4821 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4822 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4824 * It is a compile-time error to declare a fragment shader
4825 * input with, or that contains, any of the following types:
4829 * * An array of arrays
4830 * * An array of structures
4831 * * A structure containing an array
4832 * * A structure containing a structure
4834 if (state
->es_shader
) {
4835 const glsl_type
*check_type
= var
->type
->without_array();
4836 if (check_type
->is_boolean() ||
4837 check_type
->contains_opaque()) {
4838 _mesa_glsl_error(&loc
, state
,
4839 "fragment shader input cannot have type %s",
4842 if (var
->type
->is_array() &&
4843 var
->type
->fields
.array
->is_array()) {
4844 _mesa_glsl_error(&loc
, state
,
4846 "cannot have an array of arrays",
4847 _mesa_shader_stage_to_string(state
->stage
));
4849 if (var
->type
->is_array() &&
4850 var
->type
->fields
.array
->is_record()) {
4851 _mesa_glsl_error(&loc
, state
,
4852 "fragment shader input "
4853 "cannot have an array of structs");
4855 if (var
->type
->is_record()) {
4856 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4857 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4858 var
->type
->fields
.structure
[i
].type
->is_record())
4859 _mesa_glsl_error(&loc
, state
,
4860 "fragement shader input cannot have "
4861 "a struct that contains an "
4866 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4867 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4868 handle_tess_shader_input_decl(state
, loc
, var
);
4870 } else if (var
->data
.mode
== ir_var_shader_out
) {
4871 const glsl_type
*check_type
= var
->type
->without_array();
4873 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4875 * It is a compile-time error to declare a vertex, tessellation
4876 * evaluation, tessellation control, or geometry shader output
4877 * that contains any of the following:
4879 * * A Boolean type (bool, bvec2 ...)
4882 if (check_type
->is_boolean() || check_type
->contains_opaque())
4883 _mesa_glsl_error(&loc
, state
,
4884 "%s shader output cannot have type %s",
4885 _mesa_shader_stage_to_string(state
->stage
),
4888 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4890 * It is a compile-time error to declare a fragment shader output
4891 * that contains any of the following:
4893 * * A Boolean type (bool, bvec2 ...)
4894 * * A double-precision scalar or vector (double, dvec2 ...)
4899 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4900 if (check_type
->is_record() || check_type
->is_matrix())
4901 _mesa_glsl_error(&loc
, state
,
4902 "fragment shader output "
4903 "cannot have struct or matrix type");
4904 switch (check_type
->base_type
) {
4905 case GLSL_TYPE_UINT
:
4907 case GLSL_TYPE_FLOAT
:
4910 _mesa_glsl_error(&loc
, state
,
4911 "fragment shader output cannot have "
4912 "type %s", check_type
->name
);
4916 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4918 * It is a compile-time error to declare a vertex shader output
4919 * with, or that contains, any of the following types:
4923 * * An array of arrays
4924 * * An array of structures
4925 * * A structure containing an array
4926 * * A structure containing a structure
4928 * It is a compile-time error to declare a fragment shader output
4929 * with, or that contains, any of the following types:
4935 * * An array of array
4937 if (state
->es_shader
) {
4938 if (var
->type
->is_array() &&
4939 var
->type
->fields
.array
->is_array()) {
4940 _mesa_glsl_error(&loc
, state
,
4942 "cannot have an array of arrays",
4943 _mesa_shader_stage_to_string(state
->stage
));
4945 if (state
->stage
== MESA_SHADER_VERTEX
) {
4946 if (var
->type
->is_array() &&
4947 var
->type
->fields
.array
->is_record()) {
4948 _mesa_glsl_error(&loc
, state
,
4949 "vertex shader output "
4950 "cannot have an array of structs");
4952 if (var
->type
->is_record()) {
4953 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4954 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4955 var
->type
->fields
.structure
[i
].type
->is_record())
4956 _mesa_glsl_error(&loc
, state
,
4957 "vertex shader output cannot have a "
4958 "struct that contains an "
4965 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4966 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4968 } else if (var
->type
->contains_subroutine()) {
4969 /* declare subroutine uniforms as hidden */
4970 var
->data
.how_declared
= ir_var_hidden
;
4973 /* From section 4.3.4 of the GLSL 4.00 spec:
4974 * "Input variables may not be declared using the patch in qualifier
4975 * in tessellation control or geometry shaders."
4977 * From section 4.3.6 of the GLSL 4.00 spec:
4978 * "It is an error to use patch out in a vertex, tessellation
4979 * evaluation, or geometry shader."
4981 * This doesn't explicitly forbid using them in a fragment shader, but
4982 * that's probably just an oversight.
4984 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4985 && this->type
->qualifier
.flags
.q
.patch
4986 && this->type
->qualifier
.flags
.q
.in
) {
4988 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4989 "tessellation evaluation shader");
4992 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4993 && this->type
->qualifier
.flags
.q
.patch
4994 && this->type
->qualifier
.flags
.q
.out
) {
4996 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4997 "tessellation control shader");
5000 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5002 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5003 state
->check_precision_qualifiers_allowed(&loc
);
5006 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5007 !precision_qualifier_allowed(var
->type
)) {
5008 _mesa_glsl_error(&loc
, state
,
5009 "precision qualifiers apply only to floating point"
5010 ", integer and opaque types");
5013 /* From section 4.1.7 of the GLSL 4.40 spec:
5015 * "[Opaque types] can only be declared as function
5016 * parameters or uniform-qualified variables."
5018 if (var_type
->contains_opaque() &&
5019 !this->type
->qualifier
.flags
.q
.uniform
) {
5020 _mesa_glsl_error(&loc
, state
,
5021 "opaque variables must be declared uniform");
5024 /* Process the initializer and add its instructions to a temporary
5025 * list. This list will be added to the instruction stream (below) after
5026 * the declaration is added. This is done because in some cases (such as
5027 * redeclarations) the declaration may not actually be added to the
5028 * instruction stream.
5030 exec_list initializer_instructions
;
5032 /* Examine var name here since var may get deleted in the next call */
5033 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5035 ir_variable
*earlier
=
5036 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5037 false /* allow_all_redeclarations */);
5038 if (earlier
!= NULL
) {
5040 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
5041 _mesa_glsl_error(&loc
, state
,
5042 "`%s' has already been redeclared using "
5043 "gl_PerVertex", earlier
->name
);
5045 earlier
->data
.how_declared
= ir_var_declared_normally
;
5048 if (decl
->initializer
!= NULL
) {
5049 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
5051 &initializer_instructions
, state
);
5053 validate_array_dimensions(var_type
, state
, &loc
);
5056 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5058 * "It is an error to write to a const variable outside of
5059 * its declaration, so they must be initialized when
5062 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5063 _mesa_glsl_error(& loc
, state
,
5064 "const declaration of `%s' must be initialized",
5068 if (state
->es_shader
) {
5069 const glsl_type
*const t
= (earlier
== NULL
)
5070 ? var
->type
: earlier
->type
;
5072 if (t
->is_unsized_array())
5073 /* Section 10.17 of the GLSL ES 1.00 specification states that
5074 * unsized array declarations have been removed from the language.
5075 * Arrays that are sized using an initializer are still explicitly
5076 * sized. However, GLSL ES 1.00 does not allow array
5077 * initializers. That is only allowed in GLSL ES 3.00.
5079 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5081 * "An array type can also be formed without specifying a size
5082 * if the definition includes an initializer:
5084 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5085 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5090 _mesa_glsl_error(& loc
, state
,
5091 "unsized array declarations are not allowed in "
5095 /* If the declaration is not a redeclaration, there are a few additional
5096 * semantic checks that must be applied. In addition, variable that was
5097 * created for the declaration should be added to the IR stream.
5099 if (earlier
== NULL
) {
5100 validate_identifier(decl
->identifier
, loc
, state
);
5102 /* Add the variable to the symbol table. Note that the initializer's
5103 * IR was already processed earlier (though it hasn't been emitted
5104 * yet), without the variable in scope.
5106 * This differs from most C-like languages, but it follows the GLSL
5107 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5110 * "Within a declaration, the scope of a name starts immediately
5111 * after the initializer if present or immediately after the name
5112 * being declared if not."
5114 if (!state
->symbols
->add_variable(var
)) {
5115 YYLTYPE loc
= this->get_location();
5116 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5117 "current scope", decl
->identifier
);
5121 /* Push the variable declaration to the top. It means that all the
5122 * variable declarations will appear in a funny last-to-first order,
5123 * but otherwise we run into trouble if a function is prototyped, a
5124 * global var is decled, then the function is defined with usage of
5125 * the global var. See glslparsertest's CorrectModule.frag.
5127 instructions
->push_head(var
);
5130 instructions
->append_list(&initializer_instructions
);
5134 /* Generally, variable declarations do not have r-values. However,
5135 * one is used for the declaration in
5137 * while (bool b = some_condition()) {
5141 * so we return the rvalue from the last seen declaration here.
5148 ast_parameter_declarator::hir(exec_list
*instructions
,
5149 struct _mesa_glsl_parse_state
*state
)
5152 const struct glsl_type
*type
;
5153 const char *name
= NULL
;
5154 YYLTYPE loc
= this->get_location();
5156 type
= this->type
->glsl_type(& name
, state
);
5160 _mesa_glsl_error(& loc
, state
,
5161 "invalid type `%s' in declaration of `%s'",
5162 name
, this->identifier
);
5164 _mesa_glsl_error(& loc
, state
,
5165 "invalid type in declaration of `%s'",
5169 type
= glsl_type::error_type
;
5172 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5174 * "Functions that accept no input arguments need not use void in the
5175 * argument list because prototypes (or definitions) are required and
5176 * therefore there is no ambiguity when an empty argument list "( )" is
5177 * declared. The idiom "(void)" as a parameter list is provided for
5180 * Placing this check here prevents a void parameter being set up
5181 * for a function, which avoids tripping up checks for main taking
5182 * parameters and lookups of an unnamed symbol.
5184 if (type
->is_void()) {
5185 if (this->identifier
!= NULL
)
5186 _mesa_glsl_error(& loc
, state
,
5187 "named parameter cannot have type `void'");
5193 if (formal_parameter
&& (this->identifier
== NULL
)) {
5194 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5198 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5199 * call already handled the "vec4[..] foo" case.
5201 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5203 if (!type
->is_error() && type
->is_unsized_array()) {
5204 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5206 type
= glsl_type::error_type
;
5210 ir_variable
*var
= new(ctx
)
5211 ir_variable(type
, this->identifier
, ir_var_function_in
);
5213 /* Apply any specified qualifiers to the parameter declaration. Note that
5214 * for function parameters the default mode is 'in'.
5216 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5219 /* From section 4.1.7 of the GLSL 4.40 spec:
5221 * "Opaque variables cannot be treated as l-values; hence cannot
5222 * be used as out or inout function parameters, nor can they be
5225 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5226 && type
->contains_opaque()) {
5227 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5228 "contain opaque variables");
5229 type
= glsl_type::error_type
;
5232 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5234 * "When calling a function, expressions that do not evaluate to
5235 * l-values cannot be passed to parameters declared as out or inout."
5237 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5239 * "Other binary or unary expressions, non-dereferenced arrays,
5240 * function names, swizzles with repeated fields, and constants
5241 * cannot be l-values."
5243 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5244 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5246 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5248 && !state
->check_version(120, 100, &loc
,
5249 "arrays cannot be out or inout parameters")) {
5250 type
= glsl_type::error_type
;
5253 instructions
->push_tail(var
);
5255 /* Parameter declarations do not have r-values.
5262 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5264 exec_list
*ir_parameters
,
5265 _mesa_glsl_parse_state
*state
)
5267 ast_parameter_declarator
*void_param
= NULL
;
5270 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5271 param
->formal_parameter
= formal
;
5272 param
->hir(ir_parameters
, state
);
5280 if ((void_param
!= NULL
) && (count
> 1)) {
5281 YYLTYPE loc
= void_param
->get_location();
5283 _mesa_glsl_error(& loc
, state
,
5284 "`void' parameter must be only parameter");
5290 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5292 /* IR invariants disallow function declarations or definitions
5293 * nested within other function definitions. But there is no
5294 * requirement about the relative order of function declarations
5295 * and definitions with respect to one another. So simply insert
5296 * the new ir_function block at the end of the toplevel instruction
5299 state
->toplevel_ir
->push_tail(f
);
5304 ast_function::hir(exec_list
*instructions
,
5305 struct _mesa_glsl_parse_state
*state
)
5308 ir_function
*f
= NULL
;
5309 ir_function_signature
*sig
= NULL
;
5310 exec_list hir_parameters
;
5311 YYLTYPE loc
= this->get_location();
5313 const char *const name
= identifier
;
5315 /* New functions are always added to the top-level IR instruction stream,
5316 * so this instruction list pointer is ignored. See also emit_function
5319 (void) instructions
;
5321 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5323 * "Function declarations (prototypes) cannot occur inside of functions;
5324 * they must be at global scope, or for the built-in functions, outside
5325 * the global scope."
5327 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5329 * "User defined functions may only be defined within the global scope."
5331 * Note that this language does not appear in GLSL 1.10.
5333 if ((state
->current_function
!= NULL
) &&
5334 state
->is_version(120, 100)) {
5335 YYLTYPE loc
= this->get_location();
5336 _mesa_glsl_error(&loc
, state
,
5337 "declaration of function `%s' not allowed within "
5338 "function body", name
);
5341 validate_identifier(name
, this->get_location(), state
);
5343 /* Convert the list of function parameters to HIR now so that they can be
5344 * used below to compare this function's signature with previously seen
5345 * signatures for functions with the same name.
5347 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5349 & hir_parameters
, state
);
5351 const char *return_type_name
;
5352 const glsl_type
*return_type
=
5353 this->return_type
->glsl_type(& return_type_name
, state
);
5356 YYLTYPE loc
= this->get_location();
5357 _mesa_glsl_error(&loc
, state
,
5358 "function `%s' has undeclared return type `%s'",
5359 name
, return_type_name
);
5360 return_type
= glsl_type::error_type
;
5363 /* ARB_shader_subroutine states:
5364 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5365 * subroutine(...) to a function declaration."
5367 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5368 YYLTYPE loc
= this->get_location();
5369 _mesa_glsl_error(&loc
, state
,
5370 "function declaration `%s' cannot have subroutine prepended",
5374 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5375 * "No qualifier is allowed on the return type of a function."
5377 if (this->return_type
->has_qualifiers(state
)) {
5378 YYLTYPE loc
= this->get_location();
5379 _mesa_glsl_error(& loc
, state
,
5380 "function `%s' return type has qualifiers", name
);
5383 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5385 * "Arrays are allowed as arguments and as the return type. In both
5386 * cases, the array must be explicitly sized."
5388 if (return_type
->is_unsized_array()) {
5389 YYLTYPE loc
= this->get_location();
5390 _mesa_glsl_error(& loc
, state
,
5391 "function `%s' return type array must be explicitly "
5395 /* From section 4.1.7 of the GLSL 4.40 spec:
5397 * "[Opaque types] can only be declared as function parameters
5398 * or uniform-qualified variables."
5400 if (return_type
->contains_opaque()) {
5401 YYLTYPE loc
= this->get_location();
5402 _mesa_glsl_error(&loc
, state
,
5403 "function `%s' return type can't contain an opaque type",
5408 if (return_type
->is_subroutine()) {
5409 YYLTYPE loc
= this->get_location();
5410 _mesa_glsl_error(&loc
, state
,
5411 "function `%s' return type can't be a subroutine type",
5416 /* Create an ir_function if one doesn't already exist. */
5417 f
= state
->symbols
->get_function(name
);
5419 f
= new(ctx
) ir_function(name
);
5420 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5421 if (!state
->symbols
->add_function(f
)) {
5422 /* This function name shadows a non-function use of the same name. */
5423 YYLTYPE loc
= this->get_location();
5424 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5425 "non-function", name
);
5429 emit_function(state
, f
);
5432 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5434 * "A shader cannot redefine or overload built-in functions."
5436 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5438 * "User code can overload the built-in functions but cannot redefine
5441 if (state
->es_shader
&& state
->language_version
>= 300) {
5442 /* Local shader has no exact candidates; check the built-ins. */
5443 _mesa_glsl_initialize_builtin_functions();
5444 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5445 YYLTYPE loc
= this->get_location();
5446 _mesa_glsl_error(& loc
, state
,
5447 "A shader cannot redefine or overload built-in "
5448 "function `%s' in GLSL ES 3.00", name
);
5453 /* Verify that this function's signature either doesn't match a previously
5454 * seen signature for a function with the same name, or, if a match is found,
5455 * that the previously seen signature does not have an associated definition.
5457 if (state
->es_shader
|| f
->has_user_signature()) {
5458 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5460 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5461 if (badvar
!= NULL
) {
5462 YYLTYPE loc
= this->get_location();
5464 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5465 "qualifiers don't match prototype", name
, badvar
);
5468 if (sig
->return_type
!= return_type
) {
5469 YYLTYPE loc
= this->get_location();
5471 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5472 "match prototype", name
);
5475 if (sig
->is_defined
) {
5476 if (is_definition
) {
5477 YYLTYPE loc
= this->get_location();
5478 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5480 /* We just encountered a prototype that exactly matches a
5481 * function that's already been defined. This is redundant,
5482 * and we should ignore it.
5490 /* Verify the return type of main() */
5491 if (strcmp(name
, "main") == 0) {
5492 if (! return_type
->is_void()) {
5493 YYLTYPE loc
= this->get_location();
5495 _mesa_glsl_error(& loc
, state
, "main() must return void");
5498 if (!hir_parameters
.is_empty()) {
5499 YYLTYPE loc
= this->get_location();
5501 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5505 /* Finish storing the information about this new function in its signature.
5508 sig
= new(ctx
) ir_function_signature(return_type
);
5509 f
->add_signature(sig
);
5512 sig
->replace_parameters(&hir_parameters
);
5515 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5518 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5519 unsigned qual_index
;
5520 if (process_qualifier_constant(state
, &loc
, "index",
5521 this->return_type
->qualifier
.index
,
5523 if (!state
->has_explicit_uniform_location()) {
5524 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5525 "GL_ARB_explicit_uniform_location or "
5527 } else if (qual_index
>= MAX_SUBROUTINES
) {
5528 _mesa_glsl_error(&loc
, state
,
5529 "invalid subroutine index (%d) index must "
5530 "be a number between 0 and "
5531 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5532 MAX_SUBROUTINES
- 1);
5534 f
->subroutine_index
= qual_index
;
5539 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5540 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5541 f
->num_subroutine_types
);
5543 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5544 const struct glsl_type
*type
;
5545 /* the subroutine type must be already declared */
5546 type
= state
->symbols
->get_type(decl
->identifier
);
5548 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5551 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5552 ir_function
*fn
= state
->subroutine_types
[i
];
5553 ir_function_signature
*tsig
= NULL
;
5555 if (strcmp(fn
->name
, decl
->identifier
))
5558 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5561 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5563 if (tsig
->return_type
!= sig
->return_type
) {
5564 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5568 f
->subroutine_types
[idx
++] = type
;
5570 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5572 state
->num_subroutines
+ 1);
5573 state
->subroutines
[state
->num_subroutines
] = f
;
5574 state
->num_subroutines
++;
5578 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5579 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5580 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5583 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5585 state
->num_subroutine_types
+ 1);
5586 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5587 state
->num_subroutine_types
++;
5589 f
->is_subroutine
= true;
5592 /* Function declarations (prototypes) do not have r-values.
5599 ast_function_definition::hir(exec_list
*instructions
,
5600 struct _mesa_glsl_parse_state
*state
)
5602 prototype
->is_definition
= true;
5603 prototype
->hir(instructions
, state
);
5605 ir_function_signature
*signature
= prototype
->signature
;
5606 if (signature
== NULL
)
5609 assert(state
->current_function
== NULL
);
5610 state
->current_function
= signature
;
5611 state
->found_return
= false;
5613 /* Duplicate parameters declared in the prototype as concrete variables.
5614 * Add these to the symbol table.
5616 state
->symbols
->push_scope();
5617 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5618 assert(var
->as_variable() != NULL
);
5620 /* The only way a parameter would "exist" is if two parameters have
5623 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5624 YYLTYPE loc
= this->get_location();
5626 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5628 state
->symbols
->add_variable(var
);
5632 /* Convert the body of the function to HIR. */
5633 this->body
->hir(&signature
->body
, state
);
5634 signature
->is_defined
= true;
5636 state
->symbols
->pop_scope();
5638 assert(state
->current_function
== signature
);
5639 state
->current_function
= NULL
;
5641 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5642 YYLTYPE loc
= this->get_location();
5643 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5644 "%s, but no return statement",
5645 signature
->function_name(),
5646 signature
->return_type
->name
);
5649 /* Function definitions do not have r-values.
5656 ast_jump_statement::hir(exec_list
*instructions
,
5657 struct _mesa_glsl_parse_state
*state
)
5664 assert(state
->current_function
);
5666 if (opt_return_value
) {
5667 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5669 /* The value of the return type can be NULL if the shader says
5670 * 'return foo();' and foo() is a function that returns void.
5672 * NOTE: The GLSL spec doesn't say that this is an error. The type
5673 * of the return value is void. If the return type of the function is
5674 * also void, then this should compile without error. Seriously.
5676 const glsl_type
*const ret_type
=
5677 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5679 /* Implicit conversions are not allowed for return values prior to
5680 * ARB_shading_language_420pack.
5682 if (state
->current_function
->return_type
!= ret_type
) {
5683 YYLTYPE loc
= this->get_location();
5685 if (state
->has_420pack()) {
5686 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5688 _mesa_glsl_error(& loc
, state
,
5689 "could not implicitly convert return value "
5690 "to %s, in function `%s'",
5691 state
->current_function
->return_type
->name
,
5692 state
->current_function
->function_name());
5695 _mesa_glsl_error(& loc
, state
,
5696 "`return' with wrong type %s, in function `%s' "
5699 state
->current_function
->function_name(),
5700 state
->current_function
->return_type
->name
);
5702 } else if (state
->current_function
->return_type
->base_type
==
5704 YYLTYPE loc
= this->get_location();
5706 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5707 * specs add a clarification:
5709 * "A void function can only use return without a return argument, even if
5710 * the return argument has void type. Return statements only accept values:
5713 * void func2() { return func1(); } // illegal return statement"
5715 _mesa_glsl_error(& loc
, state
,
5716 "void functions can only use `return' without a "
5720 inst
= new(ctx
) ir_return(ret
);
5722 if (state
->current_function
->return_type
->base_type
!=
5724 YYLTYPE loc
= this->get_location();
5726 _mesa_glsl_error(& loc
, state
,
5727 "`return' with no value, in function %s returning "
5729 state
->current_function
->function_name());
5731 inst
= new(ctx
) ir_return
;
5734 state
->found_return
= true;
5735 instructions
->push_tail(inst
);
5740 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5741 YYLTYPE loc
= this->get_location();
5743 _mesa_glsl_error(& loc
, state
,
5744 "`discard' may only appear in a fragment shader");
5746 instructions
->push_tail(new(ctx
) ir_discard
);
5751 if (mode
== ast_continue
&&
5752 state
->loop_nesting_ast
== NULL
) {
5753 YYLTYPE loc
= this->get_location();
5755 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5756 } else if (mode
== ast_break
&&
5757 state
->loop_nesting_ast
== NULL
&&
5758 state
->switch_state
.switch_nesting_ast
== NULL
) {
5759 YYLTYPE loc
= this->get_location();
5761 _mesa_glsl_error(& loc
, state
,
5762 "break may only appear in a loop or a switch");
5764 /* For a loop, inline the for loop expression again, since we don't
5765 * know where near the end of the loop body the normal copy of it is
5766 * going to be placed. Same goes for the condition for a do-while
5769 if (state
->loop_nesting_ast
!= NULL
&&
5770 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5771 if (state
->loop_nesting_ast
->rest_expression
) {
5772 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5775 if (state
->loop_nesting_ast
->mode
==
5776 ast_iteration_statement::ast_do_while
) {
5777 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5781 if (state
->switch_state
.is_switch_innermost
&&
5782 mode
== ast_continue
) {
5783 /* Set 'continue_inside' to true. */
5784 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5785 ir_dereference_variable
*deref_continue_inside_var
=
5786 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5787 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5790 /* Break out from the switch, continue for the loop will
5791 * be called right after switch. */
5792 ir_loop_jump
*const jump
=
5793 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5794 instructions
->push_tail(jump
);
5796 } else if (state
->switch_state
.is_switch_innermost
&&
5797 mode
== ast_break
) {
5798 /* Force break out of switch by inserting a break. */
5799 ir_loop_jump
*const jump
=
5800 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5801 instructions
->push_tail(jump
);
5803 ir_loop_jump
*const jump
=
5804 new(ctx
) ir_loop_jump((mode
== ast_break
)
5805 ? ir_loop_jump::jump_break
5806 : ir_loop_jump::jump_continue
);
5807 instructions
->push_tail(jump
);
5814 /* Jump instructions do not have r-values.
5821 ast_selection_statement::hir(exec_list
*instructions
,
5822 struct _mesa_glsl_parse_state
*state
)
5826 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5828 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5830 * "Any expression whose type evaluates to a Boolean can be used as the
5831 * conditional expression bool-expression. Vector types are not accepted
5832 * as the expression to if."
5834 * The checks are separated so that higher quality diagnostics can be
5835 * generated for cases where both rules are violated.
5837 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5838 YYLTYPE loc
= this->condition
->get_location();
5840 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5844 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5846 if (then_statement
!= NULL
) {
5847 state
->symbols
->push_scope();
5848 then_statement
->hir(& stmt
->then_instructions
, state
);
5849 state
->symbols
->pop_scope();
5852 if (else_statement
!= NULL
) {
5853 state
->symbols
->push_scope();
5854 else_statement
->hir(& stmt
->else_instructions
, state
);
5855 state
->symbols
->pop_scope();
5858 instructions
->push_tail(stmt
);
5860 /* if-statements do not have r-values.
5867 ast_switch_statement::hir(exec_list
*instructions
,
5868 struct _mesa_glsl_parse_state
*state
)
5872 ir_rvalue
*const test_expression
=
5873 this->test_expression
->hir(instructions
, state
);
5875 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5877 * "The type of init-expression in a switch statement must be a
5880 if (!test_expression
->type
->is_scalar() ||
5881 !test_expression
->type
->is_integer()) {
5882 YYLTYPE loc
= this->test_expression
->get_location();
5884 _mesa_glsl_error(& loc
,
5886 "switch-statement expression must be scalar "
5890 /* Track the switch-statement nesting in a stack-like manner.
5892 struct glsl_switch_state saved
= state
->switch_state
;
5894 state
->switch_state
.is_switch_innermost
= true;
5895 state
->switch_state
.switch_nesting_ast
= this;
5896 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5897 hash_table_pointer_compare
);
5898 state
->switch_state
.previous_default
= NULL
;
5900 /* Initalize is_fallthru state to false.
5902 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5903 state
->switch_state
.is_fallthru_var
=
5904 new(ctx
) ir_variable(glsl_type::bool_type
,
5905 "switch_is_fallthru_tmp",
5907 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5909 ir_dereference_variable
*deref_is_fallthru_var
=
5910 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5911 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5914 /* Initialize continue_inside state to false.
5916 state
->switch_state
.continue_inside
=
5917 new(ctx
) ir_variable(glsl_type::bool_type
,
5918 "continue_inside_tmp",
5920 instructions
->push_tail(state
->switch_state
.continue_inside
);
5922 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5923 ir_dereference_variable
*deref_continue_inside_var
=
5924 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5925 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5928 state
->switch_state
.run_default
=
5929 new(ctx
) ir_variable(glsl_type::bool_type
,
5932 instructions
->push_tail(state
->switch_state
.run_default
);
5934 /* Loop around the switch is used for flow control. */
5935 ir_loop
* loop
= new(ctx
) ir_loop();
5936 instructions
->push_tail(loop
);
5938 /* Cache test expression.
5940 test_to_hir(&loop
->body_instructions
, state
);
5942 /* Emit code for body of switch stmt.
5944 body
->hir(&loop
->body_instructions
, state
);
5946 /* Insert a break at the end to exit loop. */
5947 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5948 loop
->body_instructions
.push_tail(jump
);
5950 /* If we are inside loop, check if continue got called inside switch. */
5951 if (state
->loop_nesting_ast
!= NULL
) {
5952 ir_dereference_variable
*deref_continue_inside
=
5953 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5954 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5955 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5957 if (state
->loop_nesting_ast
!= NULL
) {
5958 if (state
->loop_nesting_ast
->rest_expression
) {
5959 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5962 if (state
->loop_nesting_ast
->mode
==
5963 ast_iteration_statement::ast_do_while
) {
5964 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5967 irif
->then_instructions
.push_tail(jump
);
5968 instructions
->push_tail(irif
);
5971 hash_table_dtor(state
->switch_state
.labels_ht
);
5973 state
->switch_state
= saved
;
5975 /* Switch statements do not have r-values. */
5981 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5982 struct _mesa_glsl_parse_state
*state
)
5986 /* set to true to avoid a duplicate "use of uninitialized variable" warning
5987 * on the switch test case. The first one would be already raised when
5988 * getting the test_expression at ast_switch_statement::hir
5990 test_expression
->set_is_lhs(true);
5991 /* Cache value of test expression. */
5992 ir_rvalue
*const test_val
=
5993 test_expression
->hir(instructions
,
5996 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5999 ir_dereference_variable
*deref_test_var
=
6000 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6002 instructions
->push_tail(state
->switch_state
.test_var
);
6003 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6008 ast_switch_body::hir(exec_list
*instructions
,
6009 struct _mesa_glsl_parse_state
*state
)
6012 stmts
->hir(instructions
, state
);
6014 /* Switch bodies do not have r-values. */
6019 ast_case_statement_list::hir(exec_list
*instructions
,
6020 struct _mesa_glsl_parse_state
*state
)
6022 exec_list default_case
, after_default
, tmp
;
6024 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6025 case_stmt
->hir(&tmp
, state
);
6028 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6029 default_case
.append_list(&tmp
);
6033 /* If default case found, append 'after_default' list. */
6034 if (!default_case
.is_empty())
6035 after_default
.append_list(&tmp
);
6037 instructions
->append_list(&tmp
);
6040 /* Handle the default case. This is done here because default might not be
6041 * the last case. We need to add checks against following cases first to see
6042 * if default should be chosen or not.
6044 if (!default_case
.is_empty()) {
6046 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6047 ir_dereference_variable
*deref_run_default_var
=
6048 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6050 /* Choose to run default case initially, following conditional
6051 * assignments might change this.
6053 ir_assignment
*const init_var
=
6054 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6055 instructions
->push_tail(init_var
);
6057 /* Default case was the last one, no checks required. */
6058 if (after_default
.is_empty()) {
6059 instructions
->append_list(&default_case
);
6063 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6064 ir_assignment
*assign
= ir
->as_assignment();
6069 /* Clone the check between case label and init expression. */
6070 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6071 ir_expression
*clone
= exp
->clone(state
, NULL
);
6073 ir_dereference_variable
*deref_var
=
6074 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6075 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6077 ir_assignment
*const set_false
=
6078 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6080 instructions
->push_tail(set_false
);
6083 /* Append default case and all cases after it. */
6084 instructions
->append_list(&default_case
);
6085 instructions
->append_list(&after_default
);
6088 /* Case statements do not have r-values. */
6093 ast_case_statement::hir(exec_list
*instructions
,
6094 struct _mesa_glsl_parse_state
*state
)
6096 labels
->hir(instructions
, state
);
6098 /* Guard case statements depending on fallthru state. */
6099 ir_dereference_variable
*const deref_fallthru_guard
=
6100 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6101 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6103 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6104 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6106 instructions
->push_tail(test_fallthru
);
6108 /* Case statements do not have r-values. */
6114 ast_case_label_list::hir(exec_list
*instructions
,
6115 struct _mesa_glsl_parse_state
*state
)
6117 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6118 label
->hir(instructions
, state
);
6120 /* Case labels do not have r-values. */
6125 ast_case_label::hir(exec_list
*instructions
,
6126 struct _mesa_glsl_parse_state
*state
)
6130 ir_dereference_variable
*deref_fallthru_var
=
6131 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6133 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6135 /* If not default case, ... */
6136 if (this->test_value
!= NULL
) {
6137 /* Conditionally set fallthru state based on
6138 * comparison of cached test expression value to case label.
6140 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6141 ir_constant
*label_const
= label_rval
->constant_expression_value();
6144 YYLTYPE loc
= this->test_value
->get_location();
6146 _mesa_glsl_error(& loc
, state
,
6147 "switch statement case label must be a "
6148 "constant expression");
6150 /* Stuff a dummy value in to allow processing to continue. */
6151 label_const
= new(ctx
) ir_constant(0);
6153 ast_expression
*previous_label
= (ast_expression
*)
6154 hash_table_find(state
->switch_state
.labels_ht
,
6155 (void *)(uintptr_t)label_const
->value
.u
[0]);
6157 if (previous_label
) {
6158 YYLTYPE loc
= this->test_value
->get_location();
6159 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6161 loc
= previous_label
->get_location();
6162 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6164 hash_table_insert(state
->switch_state
.labels_ht
,
6166 (void *)(uintptr_t)label_const
->value
.u
[0]);
6170 ir_dereference_variable
*deref_test_var
=
6171 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6173 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6178 * From GLSL 4.40 specification section 6.2 ("Selection"):
6180 * "The type of the init-expression value in a switch statement must
6181 * be a scalar int or uint. The type of the constant-expression value
6182 * in a case label also must be a scalar int or uint. When any pair
6183 * of these values is tested for "equal value" and the types do not
6184 * match, an implicit conversion will be done to convert the int to a
6185 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6188 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6189 YYLTYPE loc
= this->test_value
->get_location();
6191 const glsl_type
*type_a
= label_const
->type
;
6192 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6194 /* Check if int->uint implicit conversion is supported. */
6195 bool integer_conversion_supported
=
6196 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6199 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6200 !integer_conversion_supported
) {
6201 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6202 "init-expression and case label (%s != %s)",
6203 type_a
->name
, type_b
->name
);
6205 /* Conversion of the case label. */
6206 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6207 if (!apply_implicit_conversion(glsl_type::uint_type
,
6208 test_cond
->operands
[0], state
))
6209 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6211 /* Conversion of the init-expression value. */
6212 if (!apply_implicit_conversion(glsl_type::uint_type
,
6213 test_cond
->operands
[1], state
))
6214 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6219 ir_assignment
*set_fallthru_on_test
=
6220 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6222 instructions
->push_tail(set_fallthru_on_test
);
6223 } else { /* default case */
6224 if (state
->switch_state
.previous_default
) {
6225 YYLTYPE loc
= this->get_location();
6226 _mesa_glsl_error(& loc
, state
,
6227 "multiple default labels in one switch");
6229 loc
= state
->switch_state
.previous_default
->get_location();
6230 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6232 state
->switch_state
.previous_default
= this;
6234 /* Set fallthru condition on 'run_default' bool. */
6235 ir_dereference_variable
*deref_run_default
=
6236 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6237 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6238 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6242 /* Set falltrhu state. */
6243 ir_assignment
*set_fallthru
=
6244 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6246 instructions
->push_tail(set_fallthru
);
6249 /* Case statements do not have r-values. */
6254 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6255 struct _mesa_glsl_parse_state
*state
)
6259 if (condition
!= NULL
) {
6260 ir_rvalue
*const cond
=
6261 condition
->hir(instructions
, state
);
6264 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6265 YYLTYPE loc
= condition
->get_location();
6267 _mesa_glsl_error(& loc
, state
,
6268 "loop condition must be scalar boolean");
6270 /* As the first code in the loop body, generate a block that looks
6271 * like 'if (!condition) break;' as the loop termination condition.
6273 ir_rvalue
*const not_cond
=
6274 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6276 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6278 ir_jump
*const break_stmt
=
6279 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6281 if_stmt
->then_instructions
.push_tail(break_stmt
);
6282 instructions
->push_tail(if_stmt
);
6289 ast_iteration_statement::hir(exec_list
*instructions
,
6290 struct _mesa_glsl_parse_state
*state
)
6294 /* For-loops and while-loops start a new scope, but do-while loops do not.
6296 if (mode
!= ast_do_while
)
6297 state
->symbols
->push_scope();
6299 if (init_statement
!= NULL
)
6300 init_statement
->hir(instructions
, state
);
6302 ir_loop
*const stmt
= new(ctx
) ir_loop();
6303 instructions
->push_tail(stmt
);
6305 /* Track the current loop nesting. */
6306 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6308 state
->loop_nesting_ast
= this;
6310 /* Likewise, indicate that following code is closest to a loop,
6311 * NOT closest to a switch.
6313 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6314 state
->switch_state
.is_switch_innermost
= false;
6316 if (mode
!= ast_do_while
)
6317 condition_to_hir(&stmt
->body_instructions
, state
);
6320 body
->hir(& stmt
->body_instructions
, state
);
6322 if (rest_expression
!= NULL
)
6323 rest_expression
->hir(& stmt
->body_instructions
, state
);
6325 if (mode
== ast_do_while
)
6326 condition_to_hir(&stmt
->body_instructions
, state
);
6328 if (mode
!= ast_do_while
)
6329 state
->symbols
->pop_scope();
6331 /* Restore previous nesting before returning. */
6332 state
->loop_nesting_ast
= nesting_ast
;
6333 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6335 /* Loops do not have r-values.
6342 * Determine if the given type is valid for establishing a default precision
6345 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6347 * "The precision statement
6349 * precision precision-qualifier type;
6351 * can be used to establish a default precision qualifier. The type field
6352 * can be either int or float or any of the sampler types, and the
6353 * precision-qualifier can be lowp, mediump, or highp."
6355 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6356 * qualifiers on sampler types, but this seems like an oversight (since the
6357 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6358 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6362 is_valid_default_precision_type(const struct glsl_type
*const type
)
6367 switch (type
->base_type
) {
6369 case GLSL_TYPE_FLOAT
:
6370 /* "int" and "float" are valid, but vectors and matrices are not. */
6371 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6372 case GLSL_TYPE_SAMPLER
:
6373 case GLSL_TYPE_IMAGE
:
6374 case GLSL_TYPE_ATOMIC_UINT
:
6383 ast_type_specifier::hir(exec_list
*instructions
,
6384 struct _mesa_glsl_parse_state
*state
)
6386 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6389 YYLTYPE loc
= this->get_location();
6391 /* If this is a precision statement, check that the type to which it is
6392 * applied is either float or int.
6394 * From section 4.5.3 of the GLSL 1.30 spec:
6395 * "The precision statement
6396 * precision precision-qualifier type;
6397 * can be used to establish a default precision qualifier. The type
6398 * field can be either int or float [...]. Any other types or
6399 * qualifiers will result in an error.
6401 if (this->default_precision
!= ast_precision_none
) {
6402 if (!state
->check_precision_qualifiers_allowed(&loc
))
6405 if (this->structure
!= NULL
) {
6406 _mesa_glsl_error(&loc
, state
,
6407 "precision qualifiers do not apply to structures");
6411 if (this->array_specifier
!= NULL
) {
6412 _mesa_glsl_error(&loc
, state
,
6413 "default precision statements do not apply to "
6418 const struct glsl_type
*const type
=
6419 state
->symbols
->get_type(this->type_name
);
6420 if (!is_valid_default_precision_type(type
)) {
6421 _mesa_glsl_error(&loc
, state
,
6422 "default precision statements apply only to "
6423 "float, int, and opaque types");
6427 if (state
->es_shader
) {
6428 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6431 * "Non-precision qualified declarations will use the precision
6432 * qualifier specified in the most recent precision statement
6433 * that is still in scope. The precision statement has the same
6434 * scoping rules as variable declarations. If it is declared
6435 * inside a compound statement, its effect stops at the end of
6436 * the innermost statement it was declared in. Precision
6437 * statements in nested scopes override precision statements in
6438 * outer scopes. Multiple precision statements for the same basic
6439 * type can appear inside the same scope, with later statements
6440 * overriding earlier statements within that scope."
6442 * Default precision specifications follow the same scope rules as
6443 * variables. So, we can track the state of the default precision
6444 * qualifiers in the symbol table, and the rules will just work. This
6445 * is a slight abuse of the symbol table, but it has the semantics
6448 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6449 this->default_precision
);
6452 /* FINISHME: Translate precision statements into IR. */
6456 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6457 * process_record_constructor() can do type-checking on C-style initializer
6458 * expressions of structs, but ast_struct_specifier should only be translated
6459 * to HIR if it is declaring the type of a structure.
6461 * The ->is_declaration field is false for initializers of variables
6462 * declared separately from the struct's type definition.
6464 * struct S { ... }; (is_declaration = true)
6465 * struct T { ... } t = { ... }; (is_declaration = true)
6466 * S s = { ... }; (is_declaration = false)
6468 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6469 return this->structure
->hir(instructions
, state
);
6476 * Process a structure or interface block tree into an array of structure fields
6478 * After parsing, where there are some syntax differnces, structures and
6479 * interface blocks are almost identical. They are similar enough that the
6480 * AST for each can be processed the same way into a set of
6481 * \c glsl_struct_field to describe the members.
6483 * If we're processing an interface block, var_mode should be the type of the
6484 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6485 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6489 * The number of fields processed. A pointer to the array structure fields is
6490 * stored in \c *fields_ret.
6493 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6494 struct _mesa_glsl_parse_state
*state
,
6495 exec_list
*declarations
,
6496 glsl_struct_field
**fields_ret
,
6498 enum glsl_matrix_layout matrix_layout
,
6499 bool allow_reserved_names
,
6500 ir_variable_mode var_mode
,
6501 ast_type_qualifier
*layout
,
6502 unsigned block_stream
,
6503 unsigned block_xfb_buffer
,
6504 unsigned block_xfb_offset
,
6505 unsigned expl_location
,
6506 unsigned expl_align
)
6508 unsigned decl_count
= 0;
6509 unsigned next_offset
= 0;
6511 /* Make an initial pass over the list of fields to determine how
6512 * many there are. Each element in this list is an ast_declarator_list.
6513 * This means that we actually need to count the number of elements in the
6514 * 'declarations' list in each of the elements.
6516 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6517 decl_count
+= decl_list
->declarations
.length();
6520 /* Allocate storage for the fields and process the field
6521 * declarations. As the declarations are processed, try to also convert
6522 * the types to HIR. This ensures that structure definitions embedded in
6523 * other structure definitions or in interface blocks are processed.
6525 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6528 bool first_member
= true;
6529 bool first_member_has_explicit_location
= false;
6532 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6533 const char *type_name
;
6534 YYLTYPE loc
= decl_list
->get_location();
6536 decl_list
->type
->specifier
->hir(instructions
, state
);
6538 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6540 * "Anonymous structures are not supported; so embedded structures
6541 * must have a declarator. A name given to an embedded struct is
6542 * scoped at the same level as the struct it is embedded in."
6544 * The same section of the GLSL 1.20 spec says:
6546 * "Anonymous structures are not supported. Embedded structures are
6549 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6550 * embedded structures in 1.10 only.
6552 if (state
->language_version
!= 110 &&
6553 decl_list
->type
->specifier
->structure
!= NULL
)
6554 _mesa_glsl_error(&loc
, state
,
6555 "embedded structure declarations are not allowed");
6557 const glsl_type
*decl_type
=
6558 decl_list
->type
->glsl_type(& type_name
, state
);
6560 const struct ast_type_qualifier
*const qual
=
6561 &decl_list
->type
->qualifier
;
6563 /* From section 4.3.9 of the GLSL 4.40 spec:
6565 * "[In interface blocks] opaque types are not allowed."
6567 * It should be impossible for decl_type to be NULL here. Cases that
6568 * might naturally lead to decl_type being NULL, especially for the
6569 * is_interface case, will have resulted in compilation having
6570 * already halted due to a syntax error.
6575 if (decl_type
->contains_opaque()) {
6576 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6577 "interface block contains opaque variable");
6580 if (decl_type
->contains_atomic()) {
6581 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6583 * "Members of structures cannot be declared as atomic counter
6586 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6589 if (decl_type
->contains_image()) {
6590 /* FINISHME: Same problem as with atomic counters.
6591 * FINISHME: Request clarification from Khronos and add
6592 * FINISHME: spec quotation here.
6594 _mesa_glsl_error(&loc
, state
, "image in structure");
6598 if (qual
->flags
.q
.explicit_binding
) {
6599 _mesa_glsl_error(&loc
, state
,
6600 "binding layout qualifier cannot be applied "
6601 "to struct or interface block members");
6605 if (!first_member
) {
6606 if (!layout
->flags
.q
.explicit_location
&&
6607 ((first_member_has_explicit_location
&&
6608 !qual
->flags
.q
.explicit_location
) ||
6609 (!first_member_has_explicit_location
&&
6610 qual
->flags
.q
.explicit_location
))) {
6611 _mesa_glsl_error(&loc
, state
,
6612 "when block-level location layout qualifier "
6613 "is not supplied either all members must "
6614 "have a location layout qualifier or all "
6615 "members must not have a location layout "
6619 first_member
= false;
6620 first_member_has_explicit_location
=
6621 qual
->flags
.q
.explicit_location
;
6625 if (qual
->flags
.q
.std140
||
6626 qual
->flags
.q
.std430
||
6627 qual
->flags
.q
.packed
||
6628 qual
->flags
.q
.shared
) {
6629 _mesa_glsl_error(&loc
, state
,
6630 "uniform/shader storage block layout qualifiers "
6631 "std140, std430, packed, and shared can only be "
6632 "applied to uniform/shader storage blocks, not "
6636 if (qual
->flags
.q
.constant
) {
6637 _mesa_glsl_error(&loc
, state
,
6638 "const storage qualifier cannot be applied "
6639 "to struct or interface block members");
6642 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6644 * "A block member may be declared with a stream identifier, but
6645 * the specified stream must match the stream associated with the
6646 * containing block."
6648 if (qual
->flags
.q
.explicit_stream
) {
6649 unsigned qual_stream
;
6650 if (process_qualifier_constant(state
, &loc
, "stream",
6651 qual
->stream
, &qual_stream
) &&
6652 qual_stream
!= block_stream
) {
6653 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6654 "interface block member does not match "
6655 "the interface block (%u vs %u)", qual_stream
,
6661 unsigned explicit_xfb_buffer
= 0;
6662 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6663 unsigned qual_xfb_buffer
;
6664 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6665 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6666 explicit_xfb_buffer
= 1;
6667 if (qual_xfb_buffer
!= block_xfb_buffer
)
6668 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6669 "interface block member does not match "
6670 "the interface block (%u vs %u)",
6671 qual_xfb_buffer
, block_xfb_buffer
);
6673 xfb_buffer
= (int) qual_xfb_buffer
;
6676 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
6677 xfb_buffer
= (int) block_xfb_buffer
;
6680 int xfb_stride
= -1;
6681 if (qual
->flags
.q
.explicit_xfb_stride
) {
6682 unsigned qual_xfb_stride
;
6683 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6684 qual
->xfb_stride
, &qual_xfb_stride
)) {
6685 xfb_stride
= (int) qual_xfb_stride
;
6689 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6690 _mesa_glsl_error(&loc
, state
,
6691 "interpolation qualifiers cannot be used "
6692 "with uniform interface blocks");
6695 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6696 qual
->has_auxiliary_storage()) {
6697 _mesa_glsl_error(&loc
, state
,
6698 "auxiliary storage qualifiers cannot be used "
6699 "in uniform blocks or structures.");
6702 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6703 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6704 _mesa_glsl_error(&loc
, state
,
6705 "row_major and column_major can only be "
6706 "applied to interface blocks");
6708 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6711 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6712 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6713 "readonly and writeonly.");
6716 foreach_list_typed (ast_declaration
, decl
, link
,
6717 &decl_list
->declarations
) {
6718 YYLTYPE loc
= decl
->get_location();
6720 if (!allow_reserved_names
)
6721 validate_identifier(decl
->identifier
, loc
, state
);
6723 const struct glsl_type
*field_type
=
6724 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6725 validate_array_dimensions(field_type
, state
, &loc
);
6726 fields
[i
].type
= field_type
;
6727 fields
[i
].name
= decl
->identifier
;
6728 fields
[i
].interpolation
=
6729 interpret_interpolation_qualifier(qual
, field_type
,
6730 var_mode
, state
, &loc
);
6731 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6732 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6733 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6734 fields
[i
].precision
= qual
->precision
;
6735 fields
[i
].offset
= -1;
6736 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6737 fields
[i
].xfb_buffer
= xfb_buffer
;
6738 fields
[i
].xfb_stride
= xfb_stride
;
6740 if (qual
->flags
.q
.explicit_location
) {
6741 unsigned qual_location
;
6742 if (process_qualifier_constant(state
, &loc
, "location",
6743 qual
->location
, &qual_location
)) {
6744 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6745 expl_location
= fields
[i
].location
+
6746 fields
[i
].type
->count_attribute_slots(false);
6749 if (layout
&& layout
->flags
.q
.explicit_location
) {
6750 fields
[i
].location
= expl_location
;
6751 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6753 fields
[i
].location
= -1;
6757 /* Offset can only be used with std430 and std140 layouts an initial
6758 * value of 0 is used for error detection.
6764 if (qual
->flags
.q
.row_major
||
6765 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6771 if(layout
->flags
.q
.std140
) {
6772 align
= field_type
->std140_base_alignment(row_major
);
6773 size
= field_type
->std140_size(row_major
);
6774 } else if (layout
->flags
.q
.std430
) {
6775 align
= field_type
->std430_base_alignment(row_major
);
6776 size
= field_type
->std430_size(row_major
);
6780 if (qual
->flags
.q
.explicit_offset
) {
6781 unsigned qual_offset
;
6782 if (process_qualifier_constant(state
, &loc
, "offset",
6783 qual
->offset
, &qual_offset
)) {
6784 if (align
!= 0 && size
!= 0) {
6785 if (next_offset
> qual_offset
)
6786 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6787 "offset overlaps previous member");
6789 if (qual_offset
% align
) {
6790 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6791 "must be a multiple of the base "
6792 "alignment of %s", field_type
->name
);
6794 fields
[i
].offset
= qual_offset
;
6795 next_offset
= glsl_align(qual_offset
+ size
, align
);
6797 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6798 "with std430 and std140 layouts");
6803 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6804 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6806 if (align
== 0 || size
== 0) {
6807 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6808 "std430 and std140 layouts");
6809 } else if (qual
->flags
.q
.explicit_align
) {
6810 unsigned member_align
;
6811 if (process_qualifier_constant(state
, &loc
, "align",
6812 qual
->align
, &member_align
)) {
6813 if (member_align
== 0 ||
6814 member_align
& (member_align
- 1)) {
6815 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6816 "in not a power of 2");
6818 fields
[i
].offset
= glsl_align(offset
, member_align
);
6819 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6823 fields
[i
].offset
= glsl_align(offset
, expl_align
);
6824 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6826 } else if (!qual
->flags
.q
.explicit_offset
) {
6827 if (align
!= 0 && size
!= 0)
6828 next_offset
= glsl_align(next_offset
+ size
, align
);
6831 /* From the ARB_enhanced_layouts spec:
6833 * "The given offset applies to the first component of the first
6834 * member of the qualified entity. Then, within the qualified
6835 * entity, subsequent components are each assigned, in order, to
6836 * the next available offset aligned to a multiple of that
6837 * component's size. Aggregate types are flattened down to the
6838 * component level to get this sequence of components."
6840 if (qual
->flags
.q
.explicit_xfb_offset
) {
6841 unsigned xfb_offset
;
6842 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
6843 qual
->offset
, &xfb_offset
)) {
6844 fields
[i
].offset
= xfb_offset
;
6845 block_xfb_offset
= fields
[i
].offset
+
6846 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6849 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
6850 unsigned align
= field_type
->is_64bit() ? 8 : 4;
6851 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
6853 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6857 /* Propogate row- / column-major information down the fields of the
6858 * structure or interface block. Structures need this data because
6859 * the structure may contain a structure that contains ... a matrix
6860 * that need the proper layout.
6862 if (is_interface
&& layout
&&
6863 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
6864 (field_type
->without_array()->is_matrix()
6865 || field_type
->without_array()->is_record())) {
6866 /* If no layout is specified for the field, inherit the layout
6869 fields
[i
].matrix_layout
= matrix_layout
;
6871 if (qual
->flags
.q
.row_major
)
6872 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6873 else if (qual
->flags
.q
.column_major
)
6874 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6876 /* If we're processing an uniform or buffer block, the matrix
6877 * layout must be decided by this point.
6879 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6880 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6883 /* Image qualifiers are allowed on buffer variables, which can only
6884 * be defined inside shader storage buffer objects
6886 if (layout
&& var_mode
== ir_var_shader_storage
) {
6887 /* For readonly and writeonly qualifiers the field definition,
6888 * if set, overwrites the layout qualifier.
6890 if (qual
->flags
.q
.read_only
) {
6891 fields
[i
].image_read_only
= true;
6892 fields
[i
].image_write_only
= false;
6893 } else if (qual
->flags
.q
.write_only
) {
6894 fields
[i
].image_read_only
= false;
6895 fields
[i
].image_write_only
= true;
6897 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6898 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6901 /* For other qualifiers, we set the flag if either the layout
6902 * qualifier or the field qualifier are set
6904 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6905 layout
->flags
.q
.coherent
;
6906 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6907 layout
->flags
.q
._volatile
;
6908 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6909 layout
->flags
.q
.restrict_flag
;
6916 assert(i
== decl_count
);
6918 *fields_ret
= fields
;
6924 ast_struct_specifier::hir(exec_list
*instructions
,
6925 struct _mesa_glsl_parse_state
*state
)
6927 YYLTYPE loc
= this->get_location();
6929 unsigned expl_location
= 0;
6930 if (layout
&& layout
->flags
.q
.explicit_location
) {
6931 if (!process_qualifier_constant(state
, &loc
, "location",
6932 layout
->location
, &expl_location
)) {
6935 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6939 glsl_struct_field
*fields
;
6940 unsigned decl_count
=
6941 ast_process_struct_or_iface_block_members(instructions
,
6943 &this->declarations
,
6946 GLSL_MATRIX_LAYOUT_INHERITED
,
6947 false /* allow_reserved_names */,
6950 0, /* for interface only */
6951 0, /* for interface only */
6952 0, /* for interface only */
6954 0 /* for interface only */);
6956 validate_identifier(this->name
, loc
, state
);
6958 const glsl_type
*t
=
6959 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6961 if (!state
->symbols
->add_type(name
, t
)) {
6962 const glsl_type
*match
= state
->symbols
->get_type(name
);
6963 /* allow struct matching for desktop GL - older UE4 does this */
6964 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
6965 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
6967 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6969 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6971 state
->num_user_structures
+ 1);
6973 s
[state
->num_user_structures
] = t
;
6974 state
->user_structures
= s
;
6975 state
->num_user_structures
++;
6979 /* Structure type definitions do not have r-values.
6986 * Visitor class which detects whether a given interface block has been used.
6988 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6991 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6992 : mode(mode
), block(block
), found(false)
6996 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6998 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7002 return visit_continue
;
7005 bool usage_found() const
7011 ir_variable_mode mode
;
7012 const glsl_type
*block
;
7017 is_unsized_array_last_element(ir_variable
*v
)
7019 const glsl_type
*interface_type
= v
->get_interface_type();
7020 int length
= interface_type
->length
;
7022 assert(v
->type
->is_unsized_array());
7024 /* Check if it is the last element of the interface */
7025 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7031 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7033 var
->data
.image_read_only
= field
.image_read_only
;
7034 var
->data
.image_write_only
= field
.image_write_only
;
7035 var
->data
.image_coherent
= field
.image_coherent
;
7036 var
->data
.image_volatile
= field
.image_volatile
;
7037 var
->data
.image_restrict
= field
.image_restrict
;
7041 ast_interface_block::hir(exec_list
*instructions
,
7042 struct _mesa_glsl_parse_state
*state
)
7044 YYLTYPE loc
= this->get_location();
7046 /* Interface blocks must be declared at global scope */
7047 if (state
->current_function
!= NULL
) {
7048 _mesa_glsl_error(&loc
, state
,
7049 "Interface block `%s' must be declared "
7054 if (!this->layout
.flags
.q
.buffer
&&
7055 this->layout
.flags
.q
.std430
) {
7056 _mesa_glsl_error(&loc
, state
,
7057 "std430 storage block layout qualifier is supported "
7058 "only for shader storage blocks");
7061 /* The ast_interface_block has a list of ast_declarator_lists. We
7062 * need to turn those into ir_variables with an association
7063 * with this uniform block.
7065 enum glsl_interface_packing packing
;
7066 if (this->layout
.flags
.q
.shared
) {
7067 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7068 } else if (this->layout
.flags
.q
.packed
) {
7069 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7070 } else if (this->layout
.flags
.q
.std430
) {
7071 packing
= GLSL_INTERFACE_PACKING_STD430
;
7073 /* The default layout is std140.
7075 packing
= GLSL_INTERFACE_PACKING_STD140
;
7078 ir_variable_mode var_mode
;
7079 const char *iface_type_name
;
7080 if (this->layout
.flags
.q
.in
) {
7081 var_mode
= ir_var_shader_in
;
7082 iface_type_name
= "in";
7083 } else if (this->layout
.flags
.q
.out
) {
7084 var_mode
= ir_var_shader_out
;
7085 iface_type_name
= "out";
7086 } else if (this->layout
.flags
.q
.uniform
) {
7087 var_mode
= ir_var_uniform
;
7088 iface_type_name
= "uniform";
7089 } else if (this->layout
.flags
.q
.buffer
) {
7090 var_mode
= ir_var_shader_storage
;
7091 iface_type_name
= "buffer";
7093 var_mode
= ir_var_auto
;
7094 iface_type_name
= "UNKNOWN";
7095 assert(!"interface block layout qualifier not found!");
7098 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7099 if (this->layout
.flags
.q
.row_major
)
7100 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7101 else if (this->layout
.flags
.q
.column_major
)
7102 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7104 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7105 exec_list declared_variables
;
7106 glsl_struct_field
*fields
;
7108 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7109 * that we don't have incompatible qualifiers
7111 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7112 _mesa_glsl_error(&loc
, state
,
7113 "Interface block sets both readonly and writeonly");
7116 if (this->layout
.flags
.q
.explicit_component
) {
7117 _mesa_glsl_error(&loc
, state
, "component layout qualifier cannot be "
7118 "applied to a matrix, a structure, a block, or an "
7119 "array containing any of these.");
7122 unsigned qual_stream
;
7123 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7125 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7126 /* If the stream qualifier is invalid it doesn't make sense to continue
7127 * on and try to compare stream layouts on member variables against it
7128 * so just return early.
7133 unsigned qual_xfb_buffer
;
7134 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7135 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7136 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7140 unsigned qual_xfb_offset
;
7141 if (layout
.flags
.q
.explicit_xfb_offset
) {
7142 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7143 layout
.offset
, &qual_xfb_offset
)) {
7148 unsigned qual_xfb_stride
;
7149 if (layout
.flags
.q
.explicit_xfb_stride
) {
7150 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7151 layout
.xfb_stride
, &qual_xfb_stride
)) {
7156 unsigned expl_location
= 0;
7157 if (layout
.flags
.q
.explicit_location
) {
7158 if (!process_qualifier_constant(state
, &loc
, "location",
7159 layout
.location
, &expl_location
)) {
7162 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7166 unsigned expl_align
= 0;
7167 if (layout
.flags
.q
.explicit_align
) {
7168 if (!process_qualifier_constant(state
, &loc
, "align",
7169 layout
.align
, &expl_align
)) {
7172 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7173 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
7180 unsigned int num_variables
=
7181 ast_process_struct_or_iface_block_members(&declared_variables
,
7183 &this->declarations
,
7187 redeclaring_per_vertex
,
7196 if (!redeclaring_per_vertex
) {
7197 validate_identifier(this->block_name
, loc
, state
);
7199 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7201 * "Block names have no other use within a shader beyond interface
7202 * matching; it is a compile-time error to use a block name at global
7203 * scope for anything other than as a block name."
7205 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7206 if (var
&& !var
->type
->is_interface()) {
7207 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7208 "already used in the scope.",
7213 const glsl_type
*earlier_per_vertex
= NULL
;
7214 if (redeclaring_per_vertex
) {
7215 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7216 * the named interface block gl_in, we can find it by looking at the
7217 * previous declaration of gl_in. Otherwise we can find it by looking
7218 * at the previous decalartion of any of the built-in outputs,
7221 * Also check that the instance name and array-ness of the redeclaration
7225 case ir_var_shader_in
:
7226 if (ir_variable
*earlier_gl_in
=
7227 state
->symbols
->get_variable("gl_in")) {
7228 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7230 _mesa_glsl_error(&loc
, state
,
7231 "redeclaration of gl_PerVertex input not allowed "
7233 _mesa_shader_stage_to_string(state
->stage
));
7235 if (this->instance_name
== NULL
||
7236 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7237 !this->array_specifier
->is_single_dimension()) {
7238 _mesa_glsl_error(&loc
, state
,
7239 "gl_PerVertex input must be redeclared as "
7243 case ir_var_shader_out
:
7244 if (ir_variable
*earlier_gl_Position
=
7245 state
->symbols
->get_variable("gl_Position")) {
7246 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7247 } else if (ir_variable
*earlier_gl_out
=
7248 state
->symbols
->get_variable("gl_out")) {
7249 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7251 _mesa_glsl_error(&loc
, state
,
7252 "redeclaration of gl_PerVertex output not "
7253 "allowed in the %s shader",
7254 _mesa_shader_stage_to_string(state
->stage
));
7256 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7257 if (this->instance_name
== NULL
||
7258 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7259 _mesa_glsl_error(&loc
, state
,
7260 "gl_PerVertex output must be redeclared as "
7264 if (this->instance_name
!= NULL
) {
7265 _mesa_glsl_error(&loc
, state
,
7266 "gl_PerVertex output may not be redeclared with "
7267 "an instance name");
7272 _mesa_glsl_error(&loc
, state
,
7273 "gl_PerVertex must be declared as an input or an "
7278 if (earlier_per_vertex
== NULL
) {
7279 /* An error has already been reported. Bail out to avoid null
7280 * dereferences later in this function.
7285 /* Copy locations from the old gl_PerVertex interface block. */
7286 for (unsigned i
= 0; i
< num_variables
; i
++) {
7287 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7289 _mesa_glsl_error(&loc
, state
,
7290 "redeclaration of gl_PerVertex must be a subset "
7291 "of the built-in members of gl_PerVertex");
7293 fields
[i
].location
=
7294 earlier_per_vertex
->fields
.structure
[j
].location
;
7296 earlier_per_vertex
->fields
.structure
[j
].offset
;
7297 fields
[i
].interpolation
=
7298 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7299 fields
[i
].centroid
=
7300 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7302 earlier_per_vertex
->fields
.structure
[j
].sample
;
7304 earlier_per_vertex
->fields
.structure
[j
].patch
;
7305 fields
[i
].precision
=
7306 earlier_per_vertex
->fields
.structure
[j
].precision
;
7307 fields
[i
].explicit_xfb_buffer
=
7308 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7309 fields
[i
].xfb_buffer
=
7310 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7311 fields
[i
].xfb_stride
=
7312 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7316 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7319 * If a built-in interface block is redeclared, it must appear in
7320 * the shader before any use of any member included in the built-in
7321 * declaration, or a compilation error will result.
7323 * This appears to be a clarification to the behaviour established for
7324 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7325 * regardless of GLSL version.
7327 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7328 v
.run(instructions
);
7329 if (v
.usage_found()) {
7330 _mesa_glsl_error(&loc
, state
,
7331 "redeclaration of a built-in interface block must "
7332 "appear before any use of any member of the "
7337 const glsl_type
*block_type
=
7338 glsl_type::get_interface_instance(fields
,
7343 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7345 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7346 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7349 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7350 YYLTYPE loc
= this->get_location();
7351 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7352 "already taken in the current scope",
7353 this->block_name
, iface_type_name
);
7356 /* Since interface blocks cannot contain statements, it should be
7357 * impossible for the block to generate any instructions.
7359 assert(declared_variables
.is_empty());
7361 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7363 * Geometry shader input variables get the per-vertex values written
7364 * out by vertex shader output variables of the same names. Since a
7365 * geometry shader operates on a set of vertices, each input varying
7366 * variable (or input block, see interface blocks below) needs to be
7367 * declared as an array.
7369 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7370 var_mode
== ir_var_shader_in
) {
7371 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7372 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7373 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7374 this->array_specifier
== NULL
&&
7375 var_mode
== ir_var_shader_in
) {
7376 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7377 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7378 this->array_specifier
== NULL
&&
7379 var_mode
== ir_var_shader_out
) {
7380 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7384 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7387 * "If an instance name (instance-name) is used, then it puts all the
7388 * members inside a scope within its own name space, accessed with the
7389 * field selector ( . ) operator (analogously to structures)."
7391 if (this->instance_name
) {
7392 if (redeclaring_per_vertex
) {
7393 /* When a built-in in an unnamed interface block is redeclared,
7394 * get_variable_being_redeclared() calls
7395 * check_builtin_array_max_size() to make sure that built-in array
7396 * variables aren't redeclared to illegal sizes. But we're looking
7397 * at a redeclaration of a named built-in interface block. So we
7398 * have to manually call check_builtin_array_max_size() for all parts
7399 * of the interface that are arrays.
7401 for (unsigned i
= 0; i
< num_variables
; i
++) {
7402 if (fields
[i
].type
->is_array()) {
7403 const unsigned size
= fields
[i
].type
->array_size();
7404 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7408 validate_identifier(this->instance_name
, loc
, state
);
7413 if (this->array_specifier
!= NULL
) {
7414 const glsl_type
*block_array_type
=
7415 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7417 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7419 * For uniform blocks declared an array, each individual array
7420 * element corresponds to a separate buffer object backing one
7421 * instance of the block. As the array size indicates the number
7422 * of buffer objects needed, uniform block array declarations
7423 * must specify an array size.
7425 * And a few paragraphs later:
7427 * Geometry shader input blocks must be declared as arrays and
7428 * follow the array declaration and linking rules for all
7429 * geometry shader inputs. All other input and output block
7430 * arrays must specify an array size.
7432 * The same applies to tessellation shaders.
7434 * The upshot of this is that the only circumstance where an
7435 * interface array size *doesn't* need to be specified is on a
7436 * geometry shader input, tessellation control shader input,
7437 * tessellation control shader output, and tessellation evaluation
7440 if (block_array_type
->is_unsized_array()) {
7441 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7442 state
->stage
== MESA_SHADER_TESS_CTRL
||
7443 state
->stage
== MESA_SHADER_TESS_EVAL
;
7444 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7446 if (this->layout
.flags
.q
.in
) {
7448 _mesa_glsl_error(&loc
, state
,
7449 "unsized input block arrays not allowed in "
7451 _mesa_shader_stage_to_string(state
->stage
));
7452 } else if (this->layout
.flags
.q
.out
) {
7454 _mesa_glsl_error(&loc
, state
,
7455 "unsized output block arrays not allowed in "
7457 _mesa_shader_stage_to_string(state
->stage
));
7459 /* by elimination, this is a uniform block array */
7460 _mesa_glsl_error(&loc
, state
,
7461 "unsized uniform block arrays not allowed in "
7463 _mesa_shader_stage_to_string(state
->stage
));
7467 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7469 * * Arrays of arrays of blocks are not allowed
7471 if (state
->es_shader
&& block_array_type
->is_array() &&
7472 block_array_type
->fields
.array
->is_array()) {
7473 _mesa_glsl_error(&loc
, state
,
7474 "arrays of arrays interface blocks are "
7478 var
= new(state
) ir_variable(block_array_type
,
7479 this->instance_name
,
7482 var
= new(state
) ir_variable(block_type
,
7483 this->instance_name
,
7487 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7488 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7490 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7491 var
->data
.read_only
= true;
7493 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7494 handle_geometry_shader_input_decl(state
, loc
, var
);
7495 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7496 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7497 handle_tess_shader_input_decl(state
, loc
, var
);
7498 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7499 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7501 for (unsigned i
= 0; i
< num_variables
; i
++) {
7502 if (var
->data
.mode
== ir_var_shader_storage
)
7503 apply_memory_qualifiers(var
, fields
[i
]);
7506 if (ir_variable
*earlier
=
7507 state
->symbols
->get_variable(this->instance_name
)) {
7508 if (!redeclaring_per_vertex
) {
7509 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7510 this->instance_name
);
7512 earlier
->data
.how_declared
= ir_var_declared_normally
;
7513 earlier
->type
= var
->type
;
7514 earlier
->reinit_interface_type(block_type
);
7517 if (this->layout
.flags
.q
.explicit_binding
) {
7518 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7522 var
->data
.stream
= qual_stream
;
7523 if (layout
.flags
.q
.explicit_location
) {
7524 var
->data
.location
= expl_location
;
7525 var
->data
.explicit_location
= true;
7528 state
->symbols
->add_variable(var
);
7529 instructions
->push_tail(var
);
7532 /* In order to have an array size, the block must also be declared with
7535 assert(this->array_specifier
== NULL
);
7537 for (unsigned i
= 0; i
< num_variables
; i
++) {
7539 new(state
) ir_variable(fields
[i
].type
,
7540 ralloc_strdup(state
, fields
[i
].name
),
7542 var
->data
.interpolation
= fields
[i
].interpolation
;
7543 var
->data
.centroid
= fields
[i
].centroid
;
7544 var
->data
.sample
= fields
[i
].sample
;
7545 var
->data
.patch
= fields
[i
].patch
;
7546 var
->data
.stream
= qual_stream
;
7547 var
->data
.location
= fields
[i
].location
;
7549 if (fields
[i
].location
!= -1)
7550 var
->data
.explicit_location
= true;
7552 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7553 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7555 if (fields
[i
].offset
!= -1)
7556 var
->data
.explicit_xfb_offset
= true;
7557 var
->data
.offset
= fields
[i
].offset
;
7559 var
->init_interface_type(block_type
);
7561 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7562 var
->data
.read_only
= true;
7564 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7565 if (state
->es_shader
) {
7566 var
->data
.precision
=
7567 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7571 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7572 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7573 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7575 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7578 if (var
->data
.mode
== ir_var_shader_storage
)
7579 apply_memory_qualifiers(var
, fields
[i
]);
7581 /* Examine var name here since var may get deleted in the next call */
7582 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7584 if (redeclaring_per_vertex
) {
7585 ir_variable
*earlier
=
7586 get_variable_being_redeclared(var
, loc
, state
,
7587 true /* allow_all_redeclarations */);
7588 if (!var_is_gl_id
|| earlier
== NULL
) {
7589 _mesa_glsl_error(&loc
, state
,
7590 "redeclaration of gl_PerVertex can only "
7591 "include built-in variables");
7592 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7593 _mesa_glsl_error(&loc
, state
,
7594 "`%s' has already been redeclared",
7597 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7598 earlier
->reinit_interface_type(block_type
);
7603 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7604 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7606 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7607 * The UBO declaration itself doesn't get an ir_variable unless it
7608 * has an instance name. This is ugly.
7610 if (this->layout
.flags
.q
.explicit_binding
) {
7611 apply_explicit_binding(state
, &loc
, var
,
7612 var
->get_interface_type(), &this->layout
);
7615 if (var
->type
->is_unsized_array()) {
7616 if (var
->is_in_shader_storage_block()) {
7617 if (is_unsized_array_last_element(var
)) {
7618 var
->data
.from_ssbo_unsized_array
= true;
7621 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7623 * "If an array is declared as the last member of a shader storage
7624 * block and the size is not specified at compile-time, it is
7625 * sized at run-time. In all other cases, arrays are sized only
7628 if (state
->es_shader
) {
7629 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
7630 "definition: only last member of a shader "
7631 "storage block can be defined as unsized "
7632 "array", fields
[i
].name
);
7637 state
->symbols
->add_variable(var
);
7638 instructions
->push_tail(var
);
7641 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7642 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7644 * It is also a compilation error ... to redeclare a built-in
7645 * block and then use a member from that built-in block that was
7646 * not included in the redeclaration.
7648 * This appears to be a clarification to the behaviour established
7649 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7650 * behaviour regardless of GLSL version.
7652 * To prevent the shader from using a member that was not included in
7653 * the redeclaration, we disable any ir_variables that are still
7654 * associated with the old declaration of gl_PerVertex (since we've
7655 * already updated all of the variables contained in the new
7656 * gl_PerVertex to point to it).
7658 * As a side effect this will prevent
7659 * validate_intrastage_interface_blocks() from getting confused and
7660 * thinking there are conflicting definitions of gl_PerVertex in the
7663 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7664 ir_variable
*const var
= node
->as_variable();
7666 var
->get_interface_type() == earlier_per_vertex
&&
7667 var
->data
.mode
== var_mode
) {
7668 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7669 _mesa_glsl_error(&loc
, state
,
7670 "redeclaration of gl_PerVertex cannot "
7671 "follow a redeclaration of `%s'",
7674 state
->symbols
->disable_variable(var
->name
);
7686 ast_tcs_output_layout::hir(exec_list
*instructions
,
7687 struct _mesa_glsl_parse_state
*state
)
7689 YYLTYPE loc
= this->get_location();
7691 unsigned num_vertices
;
7692 if (!state
->out_qualifier
->vertices
->
7693 process_qualifier_constant(state
, "vertices", &num_vertices
,
7695 /* return here to stop cascading incorrect error messages */
7699 /* If any shader outputs occurred before this declaration and specified an
7700 * array size, make sure the size they specified is consistent with the
7703 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7704 _mesa_glsl_error(&loc
, state
,
7705 "this tessellation control shader output layout "
7706 "specifies %u vertices, but a previous output "
7707 "is declared with size %u",
7708 num_vertices
, state
->tcs_output_size
);
7712 state
->tcs_output_vertices_specified
= true;
7714 /* If any shader outputs occurred before this declaration and did not
7715 * specify an array size, their size is determined now.
7717 foreach_in_list (ir_instruction
, node
, instructions
) {
7718 ir_variable
*var
= node
->as_variable();
7719 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7722 /* Note: Not all tessellation control shader output are arrays. */
7723 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7726 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7727 _mesa_glsl_error(&loc
, state
,
7728 "this tessellation control shader output layout "
7729 "specifies %u vertices, but an access to element "
7730 "%u of output `%s' already exists", num_vertices
,
7731 var
->data
.max_array_access
, var
->name
);
7733 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7743 ast_gs_input_layout::hir(exec_list
*instructions
,
7744 struct _mesa_glsl_parse_state
*state
)
7746 YYLTYPE loc
= this->get_location();
7748 /* If any geometry input layout declaration preceded this one, make sure it
7749 * was consistent with this one.
7751 if (state
->gs_input_prim_type_specified
&&
7752 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7753 _mesa_glsl_error(&loc
, state
,
7754 "geometry shader input layout does not match"
7755 " previous declaration");
7759 /* If any shader inputs occurred before this declaration and specified an
7760 * array size, make sure the size they specified is consistent with the
7763 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7764 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7765 _mesa_glsl_error(&loc
, state
,
7766 "this geometry shader input layout implies %u vertices"
7767 " per primitive, but a previous input is declared"
7768 " with size %u", num_vertices
, state
->gs_input_size
);
7772 state
->gs_input_prim_type_specified
= true;
7774 /* If any shader inputs occurred before this declaration and did not
7775 * specify an array size, their size is determined now.
7777 foreach_in_list(ir_instruction
, node
, instructions
) {
7778 ir_variable
*var
= node
->as_variable();
7779 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7782 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7786 if (var
->type
->is_unsized_array()) {
7787 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7788 _mesa_glsl_error(&loc
, state
,
7789 "this geometry shader input layout implies %u"
7790 " vertices, but an access to element %u of input"
7791 " `%s' already exists", num_vertices
,
7792 var
->data
.max_array_access
, var
->name
);
7794 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7805 ast_cs_input_layout::hir(exec_list
*instructions
,
7806 struct _mesa_glsl_parse_state
*state
)
7808 YYLTYPE loc
= this->get_location();
7810 /* From the ARB_compute_shader specification:
7812 * If the local size of the shader in any dimension is greater
7813 * than the maximum size supported by the implementation for that
7814 * dimension, a compile-time error results.
7816 * It is not clear from the spec how the error should be reported if
7817 * the total size of the work group exceeds
7818 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7819 * report it at compile time as well.
7821 GLuint64 total_invocations
= 1;
7822 unsigned qual_local_size
[3];
7823 for (int i
= 0; i
< 3; i
++) {
7825 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7827 /* Infer a local_size of 1 for unspecified dimensions */
7828 if (this->local_size
[i
] == NULL
) {
7829 qual_local_size
[i
] = 1;
7830 } else if (!this->local_size
[i
]->
7831 process_qualifier_constant(state
, local_size_str
,
7832 &qual_local_size
[i
], false)) {
7833 ralloc_free(local_size_str
);
7836 ralloc_free(local_size_str
);
7838 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7839 _mesa_glsl_error(&loc
, state
,
7840 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7842 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7845 total_invocations
*= qual_local_size
[i
];
7846 if (total_invocations
>
7847 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7848 _mesa_glsl_error(&loc
, state
,
7849 "product of local_sizes exceeds "
7850 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7851 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7856 /* If any compute input layout declaration preceded this one, make sure it
7857 * was consistent with this one.
7859 if (state
->cs_input_local_size_specified
) {
7860 for (int i
= 0; i
< 3; i
++) {
7861 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7862 _mesa_glsl_error(&loc
, state
,
7863 "compute shader input layout does not match"
7864 " previous declaration");
7870 state
->cs_input_local_size_specified
= true;
7871 for (int i
= 0; i
< 3; i
++)
7872 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7874 /* We may now declare the built-in constant gl_WorkGroupSize (see
7875 * builtin_variable_generator::generate_constants() for why we didn't
7876 * declare it earlier).
7878 ir_variable
*var
= new(state
->symbols
)
7879 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7880 var
->data
.how_declared
= ir_var_declared_implicitly
;
7881 var
->data
.read_only
= true;
7882 instructions
->push_tail(var
);
7883 state
->symbols
->add_variable(var
);
7884 ir_constant_data data
;
7885 memset(&data
, 0, sizeof(data
));
7886 for (int i
= 0; i
< 3; i
++)
7887 data
.u
[i
] = qual_local_size
[i
];
7888 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7889 var
->constant_initializer
=
7890 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7891 var
->data
.has_initializer
= true;
7898 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7899 exec_list
*instructions
)
7901 bool gl_FragColor_assigned
= false;
7902 bool gl_FragData_assigned
= false;
7903 bool gl_FragSecondaryColor_assigned
= false;
7904 bool gl_FragSecondaryData_assigned
= false;
7905 bool user_defined_fs_output_assigned
= false;
7906 ir_variable
*user_defined_fs_output
= NULL
;
7908 /* It would be nice to have proper location information. */
7910 memset(&loc
, 0, sizeof(loc
));
7912 foreach_in_list(ir_instruction
, node
, instructions
) {
7913 ir_variable
*var
= node
->as_variable();
7915 if (!var
|| !var
->data
.assigned
)
7918 if (strcmp(var
->name
, "gl_FragColor") == 0)
7919 gl_FragColor_assigned
= true;
7920 else if (strcmp(var
->name
, "gl_FragData") == 0)
7921 gl_FragData_assigned
= true;
7922 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7923 gl_FragSecondaryColor_assigned
= true;
7924 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7925 gl_FragSecondaryData_assigned
= true;
7926 else if (!is_gl_identifier(var
->name
)) {
7927 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7928 var
->data
.mode
== ir_var_shader_out
) {
7929 user_defined_fs_output_assigned
= true;
7930 user_defined_fs_output
= var
;
7935 /* From the GLSL 1.30 spec:
7937 * "If a shader statically assigns a value to gl_FragColor, it
7938 * may not assign a value to any element of gl_FragData. If a
7939 * shader statically writes a value to any element of
7940 * gl_FragData, it may not assign a value to
7941 * gl_FragColor. That is, a shader may assign values to either
7942 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7943 * linked together must also consistently write just one of
7944 * these variables. Similarly, if user declared output
7945 * variables are in use (statically assigned to), then the
7946 * built-in variables gl_FragColor and gl_FragData may not be
7947 * assigned to. These incorrect usages all generate compile
7950 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7951 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7952 "`gl_FragColor' and `gl_FragData'");
7953 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7954 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7955 "`gl_FragColor' and `%s'",
7956 user_defined_fs_output
->name
);
7957 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7958 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7959 "`gl_FragSecondaryColorEXT' and"
7960 " `gl_FragSecondaryDataEXT'");
7961 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7962 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7963 "`gl_FragColor' and"
7964 " `gl_FragSecondaryDataEXT'");
7965 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7966 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7968 " `gl_FragSecondaryColorEXT'");
7969 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7970 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7971 "`gl_FragData' and `%s'",
7972 user_defined_fs_output
->name
);
7975 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7976 !state
->EXT_blend_func_extended_enable
) {
7977 _mesa_glsl_error(&loc
, state
,
7978 "Dual source blending requires EXT_blend_func_extended");
7984 remove_per_vertex_blocks(exec_list
*instructions
,
7985 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7987 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7988 * if it exists in this shader type.
7990 const glsl_type
*per_vertex
= NULL
;
7992 case ir_var_shader_in
:
7993 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7994 per_vertex
= gl_in
->get_interface_type();
7996 case ir_var_shader_out
:
7997 if (ir_variable
*gl_Position
=
7998 state
->symbols
->get_variable("gl_Position")) {
7999 per_vertex
= gl_Position
->get_interface_type();
8003 assert(!"Unexpected mode");
8007 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8008 * need to do anything.
8010 if (per_vertex
== NULL
)
8013 /* If the interface block is used by the shader, then we don't need to do
8016 interface_block_usage_visitor
v(mode
, per_vertex
);
8017 v
.run(instructions
);
8018 if (v
.usage_found())
8021 /* Remove any ir_variable declarations that refer to the interface block
8024 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8025 ir_variable
*const var
= node
->as_variable();
8026 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8027 var
->data
.mode
== mode
) {
8028 state
->symbols
->disable_variable(var
->name
);