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_subroutine() ||
1499 op
[1]->type
->contains_subroutine())) {
1500 _mesa_glsl_error(&loc
, state
, "subroutine comparisons forbidden");
1501 error_emitted
= true;
1502 } else if ((op
[0]->type
->contains_opaque() ||
1503 op
[1]->type
->contains_opaque())) {
1504 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1505 error_emitted
= true;
1508 if (error_emitted
) {
1509 result
= new(ctx
) ir_constant(false);
1511 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1512 assert(result
->type
== glsl_type::bool_type
);
1519 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1520 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1521 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1522 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1524 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1528 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1530 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1531 error_emitted
= true;
1534 if (!op
[0]->type
->is_integer()) {
1535 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1536 error_emitted
= true;
1539 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1540 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1543 case ast_logic_and
: {
1544 exec_list rhs_instructions
;
1545 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1546 "LHS", &error_emitted
);
1547 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1548 "RHS", &error_emitted
);
1550 if (rhs_instructions
.is_empty()) {
1551 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1552 type
= result
->type
;
1554 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1557 instructions
->push_tail(tmp
);
1559 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1560 instructions
->push_tail(stmt
);
1562 stmt
->then_instructions
.append_list(&rhs_instructions
);
1563 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1564 ir_assignment
*const then_assign
=
1565 new(ctx
) ir_assignment(then_deref
, op
[1]);
1566 stmt
->then_instructions
.push_tail(then_assign
);
1568 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1569 ir_assignment
*const else_assign
=
1570 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1571 stmt
->else_instructions
.push_tail(else_assign
);
1573 result
= new(ctx
) ir_dereference_variable(tmp
);
1579 case ast_logic_or
: {
1580 exec_list rhs_instructions
;
1581 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1582 "LHS", &error_emitted
);
1583 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1584 "RHS", &error_emitted
);
1586 if (rhs_instructions
.is_empty()) {
1587 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1588 type
= result
->type
;
1590 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1593 instructions
->push_tail(tmp
);
1595 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1596 instructions
->push_tail(stmt
);
1598 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1599 ir_assignment
*const then_assign
=
1600 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1601 stmt
->then_instructions
.push_tail(then_assign
);
1603 stmt
->else_instructions
.append_list(&rhs_instructions
);
1604 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1605 ir_assignment
*const else_assign
=
1606 new(ctx
) ir_assignment(else_deref
, op
[1]);
1607 stmt
->else_instructions
.push_tail(else_assign
);
1609 result
= new(ctx
) ir_dereference_variable(tmp
);
1616 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1618 * "The logical binary operators and (&&), or ( | | ), and
1619 * exclusive or (^^). They operate only on two Boolean
1620 * expressions and result in a Boolean expression."
1622 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1624 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1627 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1632 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1633 "operand", &error_emitted
);
1635 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1639 case ast_mul_assign
:
1640 case ast_div_assign
:
1641 case ast_add_assign
:
1642 case ast_sub_assign
: {
1643 this->subexpressions
[0]->set_is_lhs(true);
1644 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1645 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1647 type
= arithmetic_result_type(op
[0], op
[1],
1648 (this->oper
== ast_mul_assign
),
1651 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1655 do_assignment(instructions
, state
,
1656 this->subexpressions
[0]->non_lvalue_description
,
1657 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1658 &result
, needs_rvalue
, false,
1659 this->subexpressions
[0]->get_location());
1661 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1662 * explicitly test for this because none of the binary expression
1663 * operators allow array operands either.
1669 case ast_mod_assign
: {
1670 this->subexpressions
[0]->set_is_lhs(true);
1671 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1672 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1674 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1676 assert(operations
[this->oper
] == ir_binop_mod
);
1678 ir_rvalue
*temp_rhs
;
1679 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1683 do_assignment(instructions
, state
,
1684 this->subexpressions
[0]->non_lvalue_description
,
1685 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1686 &result
, needs_rvalue
, false,
1687 this->subexpressions
[0]->get_location());
1692 case ast_rs_assign
: {
1693 this->subexpressions
[0]->set_is_lhs(true);
1694 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1695 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1696 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1698 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1699 type
, op
[0], op
[1]);
1701 do_assignment(instructions
, state
,
1702 this->subexpressions
[0]->non_lvalue_description
,
1703 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1704 &result
, needs_rvalue
, false,
1705 this->subexpressions
[0]->get_location());
1709 case ast_and_assign
:
1710 case ast_xor_assign
:
1711 case ast_or_assign
: {
1712 this->subexpressions
[0]->set_is_lhs(true);
1713 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1714 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1715 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1716 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1717 type
, op
[0], op
[1]);
1719 do_assignment(instructions
, state
,
1720 this->subexpressions
[0]->non_lvalue_description
,
1721 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1722 &result
, needs_rvalue
, false,
1723 this->subexpressions
[0]->get_location());
1727 case ast_conditional
: {
1728 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1730 * "The ternary selection operator (?:). It operates on three
1731 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1732 * first expression, which must result in a scalar Boolean."
1734 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1735 "condition", &error_emitted
);
1737 /* The :? operator is implemented by generating an anonymous temporary
1738 * followed by an if-statement. The last instruction in each branch of
1739 * the if-statement assigns a value to the anonymous temporary. This
1740 * temporary is the r-value of the expression.
1742 exec_list then_instructions
;
1743 exec_list else_instructions
;
1745 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1746 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1748 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1750 * "The second and third expressions can be any type, as
1751 * long their types match, or there is a conversion in
1752 * Section 4.1.10 "Implicit Conversions" that can be applied
1753 * to one of the expressions to make their types match. This
1754 * resulting matching type is the type of the entire
1757 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1758 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1759 || (op
[1]->type
!= op
[2]->type
)) {
1760 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1762 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1763 "operator must have matching types");
1764 error_emitted
= true;
1765 type
= glsl_type::error_type
;
1770 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1772 * "The second and third expressions must be the same type, but can
1773 * be of any type other than an array."
1775 if (type
->is_array() &&
1776 !state
->check_version(120, 300, &loc
,
1777 "second and third operands of ?: operator "
1778 "cannot be arrays")) {
1779 error_emitted
= true;
1782 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1784 * "Except for array indexing, structure member selection, and
1785 * parentheses, opaque variables are not allowed to be operands in
1786 * expressions; such use results in a compile-time error."
1788 if (type
->contains_opaque()) {
1789 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1790 "of the ?: operator");
1791 error_emitted
= true;
1794 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1796 if (then_instructions
.is_empty()
1797 && else_instructions
.is_empty()
1798 && cond_val
!= NULL
) {
1799 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1801 /* The copy to conditional_tmp reads the whole array. */
1802 if (type
->is_array()) {
1803 mark_whole_array_access(op
[1]);
1804 mark_whole_array_access(op
[2]);
1807 ir_variable
*const tmp
=
1808 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1809 instructions
->push_tail(tmp
);
1811 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1812 instructions
->push_tail(stmt
);
1814 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1815 ir_dereference
*const then_deref
=
1816 new(ctx
) ir_dereference_variable(tmp
);
1817 ir_assignment
*const then_assign
=
1818 new(ctx
) ir_assignment(then_deref
, op
[1]);
1819 stmt
->then_instructions
.push_tail(then_assign
);
1821 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1822 ir_dereference
*const else_deref
=
1823 new(ctx
) ir_dereference_variable(tmp
);
1824 ir_assignment
*const else_assign
=
1825 new(ctx
) ir_assignment(else_deref
, op
[2]);
1826 stmt
->else_instructions
.push_tail(else_assign
);
1828 result
= new(ctx
) ir_dereference_variable(tmp
);
1835 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1836 ? "pre-increment operation" : "pre-decrement operation";
1838 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1839 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1841 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1843 ir_rvalue
*temp_rhs
;
1844 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1848 do_assignment(instructions
, state
,
1849 this->subexpressions
[0]->non_lvalue_description
,
1850 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1851 &result
, needs_rvalue
, false,
1852 this->subexpressions
[0]->get_location());
1857 case ast_post_dec
: {
1858 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1859 ? "post-increment operation" : "post-decrement operation";
1860 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1861 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1863 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1865 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1867 ir_rvalue
*temp_rhs
;
1868 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1871 /* Get a temporary of a copy of the lvalue before it's modified.
1872 * This may get thrown away later.
1874 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1876 ir_rvalue
*junk_rvalue
;
1878 do_assignment(instructions
, state
,
1879 this->subexpressions
[0]->non_lvalue_description
,
1880 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1881 &junk_rvalue
, false, false,
1882 this->subexpressions
[0]->get_location());
1887 case ast_field_selection
:
1888 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1891 case ast_array_index
: {
1892 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1894 /* Getting if an array is being used uninitialized is beyond what we get
1895 * from ir_value.data.assigned. Setting is_lhs as true would force to
1896 * not raise a uninitialized warning when using an array
1898 subexpressions
[0]->set_is_lhs(true);
1899 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1900 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1902 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1905 if (result
->type
->is_error())
1906 error_emitted
= true;
1911 case ast_unsized_array_dim
:
1912 assert(!"ast_unsized_array_dim: Should never get here.");
1915 case ast_function_call
:
1916 /* Should *NEVER* get here. ast_function_call should always be handled
1917 * by ast_function_expression::hir.
1922 case ast_identifier
: {
1923 /* ast_identifier can appear several places in a full abstract syntax
1924 * tree. This particular use must be at location specified in the grammar
1925 * as 'variable_identifier'.
1928 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1931 /* the identifier might be a subroutine name */
1933 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
1934 var
= state
->symbols
->get_variable(sub_name
);
1935 ralloc_free(sub_name
);
1939 var
->data
.used
= true;
1940 result
= new(ctx
) ir_dereference_variable(var
);
1942 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
1944 && result
->variable_referenced()->data
.assigned
!= true
1945 && !is_gl_identifier(var
->name
)) {
1946 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
1947 this->primary_expression
.identifier
);
1950 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1951 this->primary_expression
.identifier
);
1953 result
= ir_rvalue::error_value(ctx
);
1954 error_emitted
= true;
1959 case ast_int_constant
:
1960 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1963 case ast_uint_constant
:
1964 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1967 case ast_float_constant
:
1968 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1971 case ast_bool_constant
:
1972 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1975 case ast_double_constant
:
1976 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1979 case ast_sequence
: {
1980 /* It should not be possible to generate a sequence in the AST without
1981 * any expressions in it.
1983 assert(!this->expressions
.is_empty());
1985 /* The r-value of a sequence is the last expression in the sequence. If
1986 * the other expressions in the sequence do not have side-effects (and
1987 * therefore add instructions to the instruction list), they get dropped
1990 exec_node
*previous_tail_pred
= NULL
;
1991 YYLTYPE previous_operand_loc
= loc
;
1993 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1994 /* If one of the operands of comma operator does not generate any
1995 * code, we want to emit a warning. At each pass through the loop
1996 * previous_tail_pred will point to the last instruction in the
1997 * stream *before* processing the previous operand. Naturally,
1998 * instructions->tail_pred will point to the last instruction in the
1999 * stream *after* processing the previous operand. If the two
2000 * pointers match, then the previous operand had no effect.
2002 * The warning behavior here differs slightly from GCC. GCC will
2003 * only emit a warning if none of the left-hand operands have an
2004 * effect. However, it will emit a warning for each. I believe that
2005 * there are some cases in C (especially with GCC extensions) where
2006 * it is useful to have an intermediate step in a sequence have no
2007 * effect, but I don't think these cases exist in GLSL. Either way,
2008 * it would be a giant hassle to replicate that behavior.
2010 if (previous_tail_pred
== instructions
->get_tail_raw()) {
2011 _mesa_glsl_warning(&previous_operand_loc
, state
,
2012 "left-hand operand of comma expression has "
2016 /* tail_pred is directly accessed instead of using the get_tail()
2017 * method for performance reasons. get_tail() has extra code to
2018 * return NULL when the list is empty. We don't care about that
2019 * here, so using tail_pred directly is fine.
2021 previous_tail_pred
= instructions
->get_tail_raw();
2022 previous_operand_loc
= ast
->get_location();
2024 result
= ast
->hir(instructions
, state
);
2027 /* Any errors should have already been emitted in the loop above.
2029 error_emitted
= true;
2033 type
= NULL
; /* use result->type, not type. */
2034 assert(result
!= NULL
|| !needs_rvalue
);
2036 if (result
&& result
->type
->is_error() && !error_emitted
)
2037 _mesa_glsl_error(& loc
, state
, "type mismatch");
2043 ast_expression::has_sequence_subexpression() const
2045 switch (this->oper
) {
2054 return this->subexpressions
[0]->has_sequence_subexpression();
2076 case ast_array_index
:
2077 case ast_mul_assign
:
2078 case ast_div_assign
:
2079 case ast_add_assign
:
2080 case ast_sub_assign
:
2081 case ast_mod_assign
:
2084 case ast_and_assign
:
2085 case ast_xor_assign
:
2087 return this->subexpressions
[0]->has_sequence_subexpression() ||
2088 this->subexpressions
[1]->has_sequence_subexpression();
2090 case ast_conditional
:
2091 return this->subexpressions
[0]->has_sequence_subexpression() ||
2092 this->subexpressions
[1]->has_sequence_subexpression() ||
2093 this->subexpressions
[2]->has_sequence_subexpression();
2098 case ast_field_selection
:
2099 case ast_identifier
:
2100 case ast_int_constant
:
2101 case ast_uint_constant
:
2102 case ast_float_constant
:
2103 case ast_bool_constant
:
2104 case ast_double_constant
:
2110 case ast_function_call
:
2111 unreachable("should be handled by ast_function_expression::hir");
2113 case ast_unsized_array_dim
:
2114 unreachable("ast_unsized_array_dim: Should never get here.");
2121 ast_expression_statement::hir(exec_list
*instructions
,
2122 struct _mesa_glsl_parse_state
*state
)
2124 /* It is possible to have expression statements that don't have an
2125 * expression. This is the solitary semicolon:
2127 * for (i = 0; i < 5; i++)
2130 * In this case the expression will be NULL. Test for NULL and don't do
2131 * anything in that case.
2133 if (expression
!= NULL
)
2134 expression
->hir_no_rvalue(instructions
, state
);
2136 /* Statements do not have r-values.
2143 ast_compound_statement::hir(exec_list
*instructions
,
2144 struct _mesa_glsl_parse_state
*state
)
2147 state
->symbols
->push_scope();
2149 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2150 ast
->hir(instructions
, state
);
2153 state
->symbols
->pop_scope();
2155 /* Compound statements do not have r-values.
2161 * Evaluate the given exec_node (which should be an ast_node representing
2162 * a single array dimension) and return its integer value.
2165 process_array_size(exec_node
*node
,
2166 struct _mesa_glsl_parse_state
*state
)
2168 exec_list dummy_instructions
;
2170 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2173 * Dimensions other than the outermost dimension can by unsized if they
2174 * are immediately sized by a constructor or initializer.
2176 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2179 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2180 YYLTYPE loc
= array_size
->get_location();
2183 _mesa_glsl_error(& loc
, state
,
2184 "array size could not be resolved");
2188 if (!ir
->type
->is_integer()) {
2189 _mesa_glsl_error(& loc
, state
,
2190 "array size must be integer type");
2194 if (!ir
->type
->is_scalar()) {
2195 _mesa_glsl_error(& loc
, state
,
2196 "array size must be scalar type");
2200 ir_constant
*const size
= ir
->constant_expression_value();
2202 (state
->is_version(120, 300) &&
2203 array_size
->has_sequence_subexpression())) {
2204 _mesa_glsl_error(& loc
, state
, "array size must be a "
2205 "constant valued expression");
2209 if (size
->value
.i
[0] <= 0) {
2210 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2214 assert(size
->type
== ir
->type
);
2216 /* If the array size is const (and we've verified that
2217 * it is) then no instructions should have been emitted
2218 * when we converted it to HIR. If they were emitted,
2219 * then either the array size isn't const after all, or
2220 * we are emitting unnecessary instructions.
2222 assert(dummy_instructions
.is_empty());
2224 return size
->value
.u
[0];
2227 static const glsl_type
*
2228 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2229 ast_array_specifier
*array_specifier
,
2230 struct _mesa_glsl_parse_state
*state
)
2232 const glsl_type
*array_type
= base
;
2234 if (array_specifier
!= NULL
) {
2235 if (base
->is_array()) {
2237 /* From page 19 (page 25) of the GLSL 1.20 spec:
2239 * "Only one-dimensional arrays may be declared."
2241 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2242 return glsl_type::error_type
;
2246 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2247 !node
->is_head_sentinel(); node
= node
->prev
) {
2248 unsigned array_size
= process_array_size(node
, state
);
2249 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2257 precision_qualifier_allowed(const glsl_type
*type
)
2259 /* Precision qualifiers apply to floating point, integer and opaque
2262 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2263 * "Any floating point or any integer declaration can have the type
2264 * preceded by one of these precision qualifiers [...] Literal
2265 * constants do not have precision qualifiers. Neither do Boolean
2268 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2271 * "Precision qualifiers are added for code portability with OpenGL
2272 * ES, not for functionality. They have the same syntax as in OpenGL
2275 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2277 * "uniform lowp sampler2D sampler;
2280 * lowp vec4 col = texture2D (sampler, coord);
2281 * // texture2D returns lowp"
2283 * From this, we infer that GLSL 1.30 (and later) should allow precision
2284 * qualifiers on sampler types just like float and integer types.
2286 const glsl_type
*const t
= type
->without_array();
2288 return (t
->is_float() || t
->is_integer() || t
->contains_opaque()) &&
2293 ast_type_specifier::glsl_type(const char **name
,
2294 struct _mesa_glsl_parse_state
*state
) const
2296 const struct glsl_type
*type
;
2298 type
= state
->symbols
->get_type(this->type_name
);
2299 *name
= this->type_name
;
2301 YYLTYPE loc
= this->get_location();
2302 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2308 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2310 * "The precision statement
2312 * precision precision-qualifier type;
2314 * can be used to establish a default precision qualifier. The type field can
2315 * be either int or float or any of the sampler types, (...) If type is float,
2316 * the directive applies to non-precision-qualified floating point type
2317 * (scalar, vector, and matrix) declarations. If type is int, the directive
2318 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2319 * and unsigned) declarations."
2321 * We use the symbol table to keep the values of the default precisions for
2322 * each 'type' in each scope and we use the 'type' string from the precision
2323 * statement as key in the symbol table. When we want to retrieve the default
2324 * precision associated with a given glsl_type we need to know the type string
2325 * associated with it. This is what this function returns.
2328 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2330 switch (type
->base_type
) {
2331 case GLSL_TYPE_FLOAT
:
2333 case GLSL_TYPE_UINT
:
2336 case GLSL_TYPE_ATOMIC_UINT
:
2337 return "atomic_uint";
2338 case GLSL_TYPE_IMAGE
:
2340 case GLSL_TYPE_SAMPLER
: {
2341 const unsigned type_idx
=
2342 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2343 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2344 assert(type_idx
< 4);
2345 switch (type
->sampled_type
) {
2346 case GLSL_TYPE_FLOAT
:
2347 switch (type
->sampler_dimensionality
) {
2348 case GLSL_SAMPLER_DIM_1D
: {
2349 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2350 static const char *const names
[4] = {
2351 "sampler1D", "sampler1DArray",
2352 "sampler1DShadow", "sampler1DArrayShadow"
2354 return names
[type_idx
];
2356 case GLSL_SAMPLER_DIM_2D
: {
2357 static const char *const names
[8] = {
2358 "sampler2D", "sampler2DArray",
2359 "sampler2DShadow", "sampler2DArrayShadow",
2360 "image2D", "image2DArray", NULL
, NULL
2362 return names
[offset
+ type_idx
];
2364 case GLSL_SAMPLER_DIM_3D
: {
2365 static const char *const names
[8] = {
2366 "sampler3D", NULL
, NULL
, NULL
,
2367 "image3D", NULL
, NULL
, NULL
2369 return names
[offset
+ type_idx
];
2371 case GLSL_SAMPLER_DIM_CUBE
: {
2372 static const char *const names
[8] = {
2373 "samplerCube", "samplerCubeArray",
2374 "samplerCubeShadow", "samplerCubeArrayShadow",
2375 "imageCube", NULL
, NULL
, NULL
2377 return names
[offset
+ type_idx
];
2379 case GLSL_SAMPLER_DIM_MS
: {
2380 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2381 static const char *const names
[4] = {
2382 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2384 return names
[type_idx
];
2386 case GLSL_SAMPLER_DIM_RECT
: {
2387 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2388 static const char *const names
[4] = {
2389 "samplerRect", NULL
, "samplerRectShadow", NULL
2391 return names
[type_idx
];
2393 case GLSL_SAMPLER_DIM_BUF
: {
2394 static const char *const names
[8] = {
2395 "samplerBuffer", NULL
, NULL
, NULL
,
2396 "imageBuffer", NULL
, NULL
, NULL
2398 return names
[offset
+ type_idx
];
2400 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2401 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2402 static const char *const names
[4] = {
2403 "samplerExternalOES", NULL
, NULL
, NULL
2405 return names
[type_idx
];
2408 unreachable("Unsupported sampler/image dimensionality");
2409 } /* sampler/image float dimensionality */
2412 switch (type
->sampler_dimensionality
) {
2413 case GLSL_SAMPLER_DIM_1D
: {
2414 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2415 static const char *const names
[4] = {
2416 "isampler1D", "isampler1DArray", NULL
, NULL
2418 return names
[type_idx
];
2420 case GLSL_SAMPLER_DIM_2D
: {
2421 static const char *const names
[8] = {
2422 "isampler2D", "isampler2DArray", NULL
, NULL
,
2423 "iimage2D", "iimage2DArray", NULL
, NULL
2425 return names
[offset
+ type_idx
];
2427 case GLSL_SAMPLER_DIM_3D
: {
2428 static const char *const names
[8] = {
2429 "isampler3D", NULL
, NULL
, NULL
,
2430 "iimage3D", NULL
, NULL
, NULL
2432 return names
[offset
+ type_idx
];
2434 case GLSL_SAMPLER_DIM_CUBE
: {
2435 static const char *const names
[8] = {
2436 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2437 "iimageCube", NULL
, NULL
, NULL
2439 return names
[offset
+ type_idx
];
2441 case GLSL_SAMPLER_DIM_MS
: {
2442 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2443 static const char *const names
[4] = {
2444 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2446 return names
[type_idx
];
2448 case GLSL_SAMPLER_DIM_RECT
: {
2449 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2450 static const char *const names
[4] = {
2451 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2453 return names
[type_idx
];
2455 case GLSL_SAMPLER_DIM_BUF
: {
2456 static const char *const names
[8] = {
2457 "isamplerBuffer", NULL
, NULL
, NULL
,
2458 "iimageBuffer", NULL
, NULL
, NULL
2460 return names
[offset
+ type_idx
];
2463 unreachable("Unsupported isampler/iimage dimensionality");
2464 } /* sampler/image int dimensionality */
2466 case GLSL_TYPE_UINT
:
2467 switch (type
->sampler_dimensionality
) {
2468 case GLSL_SAMPLER_DIM_1D
: {
2469 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2470 static const char *const names
[4] = {
2471 "usampler1D", "usampler1DArray", NULL
, NULL
2473 return names
[type_idx
];
2475 case GLSL_SAMPLER_DIM_2D
: {
2476 static const char *const names
[8] = {
2477 "usampler2D", "usampler2DArray", NULL
, NULL
,
2478 "uimage2D", "uimage2DArray", NULL
, NULL
2480 return names
[offset
+ type_idx
];
2482 case GLSL_SAMPLER_DIM_3D
: {
2483 static const char *const names
[8] = {
2484 "usampler3D", NULL
, NULL
, NULL
,
2485 "uimage3D", NULL
, NULL
, NULL
2487 return names
[offset
+ type_idx
];
2489 case GLSL_SAMPLER_DIM_CUBE
: {
2490 static const char *const names
[8] = {
2491 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2492 "uimageCube", NULL
, NULL
, NULL
2494 return names
[offset
+ type_idx
];
2496 case GLSL_SAMPLER_DIM_MS
: {
2497 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2498 static const char *const names
[4] = {
2499 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2501 return names
[type_idx
];
2503 case GLSL_SAMPLER_DIM_RECT
: {
2504 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2505 static const char *const names
[4] = {
2506 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2508 return names
[type_idx
];
2510 case GLSL_SAMPLER_DIM_BUF
: {
2511 static const char *const names
[8] = {
2512 "usamplerBuffer", NULL
, NULL
, NULL
,
2513 "uimageBuffer", NULL
, NULL
, NULL
2515 return names
[offset
+ type_idx
];
2518 unreachable("Unsupported usampler/uimage dimensionality");
2519 } /* sampler/image uint dimensionality */
2522 unreachable("Unsupported sampler/image type");
2523 } /* sampler/image type */
2525 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2528 unreachable("Unsupported type");
2533 select_gles_precision(unsigned qual_precision
,
2534 const glsl_type
*type
,
2535 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2537 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2538 * In GLES we take the precision from the type qualifier if present,
2539 * otherwise, if the type of the variable allows precision qualifiers at
2540 * all, we look for the default precision qualifier for that type in the
2543 assert(state
->es_shader
);
2545 unsigned precision
= GLSL_PRECISION_NONE
;
2546 if (qual_precision
) {
2547 precision
= qual_precision
;
2548 } else if (precision_qualifier_allowed(type
)) {
2549 const char *type_name
=
2550 get_type_name_for_precision_qualifier(type
->without_array());
2551 assert(type_name
!= NULL
);
2554 state
->symbols
->get_default_precision_qualifier(type_name
);
2555 if (precision
== ast_precision_none
) {
2556 _mesa_glsl_error(loc
, state
,
2557 "No precision specified in this scope for type `%s'",
2565 ast_fully_specified_type::glsl_type(const char **name
,
2566 struct _mesa_glsl_parse_state
*state
) const
2568 return this->specifier
->glsl_type(name
, state
);
2572 * Determine whether a toplevel variable declaration declares a varying. This
2573 * function operates by examining the variable's mode and the shader target,
2574 * so it correctly identifies linkage variables regardless of whether they are
2575 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2577 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2578 * this function will produce undefined results.
2581 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2584 case MESA_SHADER_VERTEX
:
2585 return var
->data
.mode
== ir_var_shader_out
;
2586 case MESA_SHADER_FRAGMENT
:
2587 return var
->data
.mode
== ir_var_shader_in
;
2589 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2595 * Matrix layout qualifiers are only allowed on certain types
2598 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2600 const glsl_type
*type
,
2603 if (var
&& !var
->is_in_buffer_block()) {
2604 /* Layout qualifiers may only apply to interface blocks and fields in
2607 _mesa_glsl_error(loc
, state
,
2608 "uniform block layout qualifiers row_major and "
2609 "column_major may not be applied to variables "
2610 "outside of uniform blocks");
2611 } else if (!type
->without_array()->is_matrix()) {
2612 /* The OpenGL ES 3.0 conformance tests did not originally allow
2613 * matrix layout qualifiers on non-matrices. However, the OpenGL
2614 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2615 * amended to specifically allow these layouts on all types. Emit
2616 * a warning so that people know their code may not be portable.
2618 _mesa_glsl_warning(loc
, state
,
2619 "uniform block layout qualifiers row_major and "
2620 "column_major applied to non-matrix types may "
2621 "be rejected by older compilers");
2626 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2627 struct _mesa_glsl_parse_state
*state
,
2628 unsigned xfb_buffer
) {
2629 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2630 _mesa_glsl_error(loc
, state
,
2631 "invalid xfb_buffer specified %d is larger than "
2632 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2634 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2641 /* From the ARB_enhanced_layouts spec:
2643 * "Variables and block members qualified with *xfb_offset* can be
2644 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2645 * The offset must be a multiple of the size of the first component of
2646 * the first qualified variable or block member, or a compile-time error
2647 * results. Further, if applied to an aggregate containing a double,
2648 * the offset must also be a multiple of 8, and the space taken in the
2649 * buffer will be a multiple of 8.
2652 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2653 struct _mesa_glsl_parse_state
*state
,
2654 int xfb_offset
, const glsl_type
*type
,
2655 unsigned component_size
) {
2656 const glsl_type
*t_without_array
= type
->without_array();
2658 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2659 _mesa_glsl_error(loc
, state
,
2660 "xfb_offset can't be used with unsized arrays.");
2664 /* Make sure nested structs don't contain unsized arrays, and validate
2665 * any xfb_offsets on interface members.
2667 if (t_without_array
->is_record() || t_without_array
->is_interface())
2668 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2669 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2671 /* When the interface block doesn't have an xfb_offset qualifier then
2672 * we apply the component size rules at the member level.
2674 if (xfb_offset
== -1)
2675 component_size
= member_t
->contains_double() ? 8 : 4;
2677 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2678 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2682 /* Nested structs or interface block without offset may not have had an
2683 * offset applied yet so return.
2685 if (xfb_offset
== -1) {
2689 if (xfb_offset
% component_size
) {
2690 _mesa_glsl_error(loc
, state
,
2691 "invalid qualifier xfb_offset=%d must be a multiple "
2692 "of the first component size of the first qualified "
2693 "variable or block member. Or double if an aggregate "
2694 "that contains a double (%d).",
2695 xfb_offset
, component_size
);
2703 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2706 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2707 _mesa_glsl_error(loc
, state
,
2708 "invalid stream specified %d is larger than "
2709 "MAX_VERTEX_STREAMS - 1 (%d).",
2710 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2718 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2721 const glsl_type
*type
,
2722 const ast_type_qualifier
*qual
)
2724 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2725 _mesa_glsl_error(loc
, state
,
2726 "the \"binding\" qualifier only applies to uniforms and "
2727 "shader storage buffer objects");
2731 unsigned qual_binding
;
2732 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2737 const struct gl_context
*const ctx
= state
->ctx
;
2738 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2739 unsigned max_index
= qual_binding
+ elements
- 1;
2740 const glsl_type
*base_type
= type
->without_array();
2742 if (base_type
->is_interface()) {
2743 /* UBOs. From page 60 of the GLSL 4.20 specification:
2744 * "If the binding point for any uniform block instance is less than zero,
2745 * or greater than or equal to the implementation-dependent maximum
2746 * number of uniform buffer bindings, a compilation error will occur.
2747 * When the binding identifier is used with a uniform block instanced as
2748 * an array of size N, all elements of the array from binding through
2749 * binding + N – 1 must be within this range."
2751 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2753 if (qual
->flags
.q
.uniform
&&
2754 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2755 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2756 "the maximum number of UBO binding points (%d)",
2757 qual_binding
, elements
,
2758 ctx
->Const
.MaxUniformBufferBindings
);
2762 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2763 * "If the binding point for any uniform or shader storage block instance
2764 * is less than zero, or greater than or equal to the
2765 * implementation-dependent maximum number of uniform buffer bindings, a
2766 * compile-time error will occur. When the binding identifier is used
2767 * with a uniform or shader storage block instanced as an array of size
2768 * N, all elements of the array from binding through binding + N – 1 must
2769 * be within this range."
2771 if (qual
->flags
.q
.buffer
&&
2772 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2773 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2774 "the maximum number of SSBO binding points (%d)",
2775 qual_binding
, elements
,
2776 ctx
->Const
.MaxShaderStorageBufferBindings
);
2779 } else if (base_type
->is_sampler()) {
2780 /* Samplers. From page 63 of the GLSL 4.20 specification:
2781 * "If the binding is less than zero, or greater than or equal to the
2782 * implementation-dependent maximum supported number of units, a
2783 * compilation error will occur. When the binding identifier is used
2784 * with an array of size N, all elements of the array from binding
2785 * through binding + N - 1 must be within this range."
2787 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2789 if (max_index
>= limit
) {
2790 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2791 "exceeds the maximum number of texture image units "
2792 "(%u)", qual_binding
, elements
, limit
);
2796 } else if (base_type
->contains_atomic()) {
2797 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2798 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2799 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2800 " maximum number of atomic counter buffer bindings"
2801 "(%u)", qual_binding
,
2802 ctx
->Const
.MaxAtomicBufferBindings
);
2806 } else if ((state
->is_version(420, 310) ||
2807 state
->ARB_shading_language_420pack_enable
) &&
2808 base_type
->is_image()) {
2809 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2810 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2811 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2812 " maximum number of image units (%d)", max_index
,
2813 ctx
->Const
.MaxImageUnits
);
2818 _mesa_glsl_error(loc
, state
,
2819 "the \"binding\" qualifier only applies to uniform "
2820 "blocks, opaque variables, or arrays thereof");
2824 var
->data
.explicit_binding
= true;
2825 var
->data
.binding
= qual_binding
;
2832 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
2834 const glsl_interp_mode interpolation
,
2835 const struct ast_type_qualifier
*qual
,
2836 const struct glsl_type
*var_type
,
2837 ir_variable_mode mode
)
2839 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
2840 * not to vertex shader inputs nor fragment shader outputs.
2842 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2843 * "Outputs from a vertex shader (out) and inputs to a fragment
2844 * shader (in) can be further qualified with one or more of these
2845 * interpolation qualifiers"
2847 * "These interpolation qualifiers may only precede the qualifiers in,
2848 * centroid in, out, or centroid out in a declaration. They do not apply
2849 * to the deprecated storage qualifiers varying or centroid
2850 * varying. They also do not apply to inputs into a vertex shader or
2851 * outputs from a fragment shader."
2853 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
2854 * "Outputs from a shader (out) and inputs to a shader (in) can be
2855 * further qualified with one of these interpolation qualifiers."
2857 * "These interpolation qualifiers may only precede the qualifiers
2858 * in, centroid in, out, or centroid out in a declaration. They do
2859 * not apply to inputs into a vertex shader or outputs from a
2862 if (state
->is_version(130, 300)
2863 && interpolation
!= INTERP_MODE_NONE
) {
2864 const char *i
= interpolation_string(interpolation
);
2865 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
2866 _mesa_glsl_error(loc
, state
,
2867 "interpolation qualifier `%s' can only be applied to "
2868 "shader inputs or outputs.", i
);
2870 switch (state
->stage
) {
2871 case MESA_SHADER_VERTEX
:
2872 if (mode
== ir_var_shader_in
) {
2873 _mesa_glsl_error(loc
, state
,
2874 "interpolation qualifier '%s' cannot be applied to "
2875 "vertex shader inputs", i
);
2878 case MESA_SHADER_FRAGMENT
:
2879 if (mode
== ir_var_shader_out
) {
2880 _mesa_glsl_error(loc
, state
,
2881 "interpolation qualifier '%s' cannot be applied to "
2882 "fragment shader outputs", i
);
2890 /* Interpolation qualifiers cannot be applied to 'centroid' and
2891 * 'centroid varying'.
2893 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2894 * "interpolation qualifiers may only precede the qualifiers in,
2895 * centroid in, out, or centroid out in a declaration. They do not apply
2896 * to the deprecated storage qualifiers varying or centroid varying."
2898 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
2900 if (state
->is_version(130, 0)
2901 && interpolation
!= INTERP_MODE_NONE
2902 && qual
->flags
.q
.varying
) {
2904 const char *i
= interpolation_string(interpolation
);
2906 if (qual
->flags
.q
.centroid
)
2907 s
= "centroid varying";
2911 _mesa_glsl_error(loc
, state
,
2912 "qualifier '%s' cannot be applied to the "
2913 "deprecated storage qualifier '%s'", i
, s
);
2916 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2917 * so must integer vertex outputs.
2919 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2920 * "Fragment shader inputs that are signed or unsigned integers or
2921 * integer vectors must be qualified with the interpolation qualifier
2924 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2925 * "Fragment shader inputs that are, or contain, signed or unsigned
2926 * integers or integer vectors must be qualified with the
2927 * interpolation qualifier flat."
2929 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2930 * "Vertex shader outputs that are, or contain, signed or unsigned
2931 * integers or integer vectors must be qualified with the
2932 * interpolation qualifier flat."
2934 * Note that prior to GLSL 1.50, this requirement applied to vertex
2935 * outputs rather than fragment inputs. That creates problems in the
2936 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2937 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2938 * apply the restriction to both vertex outputs and fragment inputs.
2940 * Note also that the desktop GLSL specs are missing the text "or
2941 * contain"; this is presumably an oversight, since there is no
2942 * reasonable way to interpolate a fragment shader input that contains
2943 * an integer. See Khronos bug #15671.
2945 if (state
->is_version(130, 300)
2946 && var_type
->contains_integer()
2947 && interpolation
!= INTERP_MODE_FLAT
2948 && ((state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_in
)
2949 || (state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_out
2950 && state
->es_shader
))) {
2951 const char *shader_var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
2952 "vertex output" : "fragment input";
2953 _mesa_glsl_error(loc
, state
, "if a %s is (or contains) "
2954 "an integer, then it must be qualified with 'flat'",
2958 /* Double fragment inputs must be qualified with 'flat'.
2960 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
2961 * "This extension does not support interpolation of double-precision
2962 * values; doubles used as fragment shader inputs must be qualified as
2965 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
2966 * "Fragment shader inputs that are signed or unsigned integers, integer
2967 * vectors, or any double-precision floating-point type must be
2968 * qualified with the interpolation qualifier flat."
2970 * Note that the GLSL specs are missing the text "or contain"; this is
2971 * presumably an oversight. See Khronos bug #15671.
2973 * The 'double' type does not exist in GLSL ES so far.
2975 if (state
->has_double()
2976 && var_type
->contains_double()
2977 && interpolation
!= INTERP_MODE_FLAT
2978 && state
->stage
== MESA_SHADER_FRAGMENT
2979 && mode
== ir_var_shader_in
) {
2980 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
2981 "a double, then it must be qualified with 'flat'");
2985 static glsl_interp_mode
2986 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2987 const struct glsl_type
*var_type
,
2988 ir_variable_mode mode
,
2989 struct _mesa_glsl_parse_state
*state
,
2992 glsl_interp_mode interpolation
;
2993 if (qual
->flags
.q
.flat
)
2994 interpolation
= INTERP_MODE_FLAT
;
2995 else if (qual
->flags
.q
.noperspective
)
2996 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
2997 else if (qual
->flags
.q
.smooth
)
2998 interpolation
= INTERP_MODE_SMOOTH
;
2999 else if (state
->es_shader
&&
3000 ((mode
== ir_var_shader_in
&&
3001 state
->stage
!= MESA_SHADER_VERTEX
) ||
3002 (mode
== ir_var_shader_out
&&
3003 state
->stage
!= MESA_SHADER_FRAGMENT
)))
3004 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
3006 * "When no interpolation qualifier is present, smooth interpolation
3009 interpolation
= INTERP_MODE_SMOOTH
;
3011 interpolation
= INTERP_MODE_NONE
;
3013 validate_interpolation_qualifier(state
, loc
,
3015 qual
, var_type
, mode
);
3017 return interpolation
;
3022 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3024 struct _mesa_glsl_parse_state
*state
,
3029 unsigned qual_location
;
3030 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3035 /* Checks for GL_ARB_explicit_uniform_location. */
3036 if (qual
->flags
.q
.uniform
) {
3037 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3040 const struct gl_context
*const ctx
= state
->ctx
;
3041 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3043 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3044 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3045 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3046 ctx
->Const
.MaxUserAssignableUniformLocations
);
3050 var
->data
.explicit_location
= true;
3051 var
->data
.location
= qual_location
;
3055 /* Between GL_ARB_explicit_attrib_location an
3056 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3057 * stage can be assigned explicit locations. The checking here associates
3058 * the correct extension with the correct stage's input / output:
3062 * vertex explicit_loc sso
3063 * tess control sso sso
3066 * fragment sso explicit_loc
3068 switch (state
->stage
) {
3069 case MESA_SHADER_VERTEX
:
3070 if (var
->data
.mode
== ir_var_shader_in
) {
3071 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3077 if (var
->data
.mode
== ir_var_shader_out
) {
3078 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3087 case MESA_SHADER_TESS_CTRL
:
3088 case MESA_SHADER_TESS_EVAL
:
3089 case MESA_SHADER_GEOMETRY
:
3090 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3091 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3100 case MESA_SHADER_FRAGMENT
:
3101 if (var
->data
.mode
== ir_var_shader_in
) {
3102 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3108 if (var
->data
.mode
== ir_var_shader_out
) {
3109 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3118 case MESA_SHADER_COMPUTE
:
3119 _mesa_glsl_error(loc
, state
,
3120 "compute shader variables cannot be given "
3121 "explicit locations");
3126 _mesa_glsl_error(loc
, state
,
3127 "%s cannot be given an explicit location in %s shader",
3129 _mesa_shader_stage_to_string(state
->stage
));
3131 var
->data
.explicit_location
= true;
3133 switch (state
->stage
) {
3134 case MESA_SHADER_VERTEX
:
3135 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3136 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3137 : (qual_location
+ VARYING_SLOT_VAR0
);
3140 case MESA_SHADER_TESS_CTRL
:
3141 case MESA_SHADER_TESS_EVAL
:
3142 case MESA_SHADER_GEOMETRY
:
3143 if (var
->data
.patch
)
3144 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3146 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3149 case MESA_SHADER_FRAGMENT
:
3150 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3151 ? (qual_location
+ FRAG_RESULT_DATA0
)
3152 : (qual_location
+ VARYING_SLOT_VAR0
);
3154 case MESA_SHADER_COMPUTE
:
3155 assert(!"Unexpected shader type");
3159 /* Check if index was set for the uniform instead of the function */
3160 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
3161 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3162 "used with subroutine functions");
3166 unsigned qual_index
;
3167 if (qual
->flags
.q
.explicit_index
&&
3168 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3170 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3171 * Layout Qualifiers):
3173 * "It is also a compile-time error if a fragment shader
3174 * sets a layout index to less than 0 or greater than 1."
3176 * Older specifications don't mandate a behavior; we take
3177 * this as a clarification and always generate the error.
3179 if (qual_index
> 1) {
3180 _mesa_glsl_error(loc
, state
,
3181 "explicit index may only be 0 or 1");
3183 var
->data
.explicit_index
= true;
3184 var
->data
.index
= qual_index
;
3191 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3193 struct _mesa_glsl_parse_state
*state
,
3196 const glsl_type
*base_type
= var
->type
->without_array();
3198 if (base_type
->is_image()) {
3199 if (var
->data
.mode
!= ir_var_uniform
&&
3200 var
->data
.mode
!= ir_var_function_in
) {
3201 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
3202 "function parameters or uniform-qualified "
3203 "global variables");
3206 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
3207 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
3208 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
3209 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
3210 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
3211 var
->data
.read_only
= true;
3213 if (qual
->flags
.q
.explicit_image_format
) {
3214 if (var
->data
.mode
== ir_var_function_in
) {
3215 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
3216 "used on image function parameters");
3219 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3220 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
3221 "base data type of the image");
3224 var
->data
.image_format
= qual
->image_format
;
3226 if (var
->data
.mode
== ir_var_uniform
) {
3227 if (state
->es_shader
) {
3228 _mesa_glsl_error(loc
, state
, "all image uniforms "
3229 "must have a format layout qualifier");
3231 } else if (!qual
->flags
.q
.write_only
) {
3232 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3233 "`writeonly' must have a format layout "
3238 var
->data
.image_format
= GL_NONE
;
3241 /* From page 70 of the GLSL ES 3.1 specification:
3243 * "Except for image variables qualified with the format qualifiers
3244 * r32f, r32i, and r32ui, image variables must specify either memory
3245 * qualifier readonly or the memory qualifier writeonly."
3247 if (state
->es_shader
&&
3248 var
->data
.image_format
!= GL_R32F
&&
3249 var
->data
.image_format
!= GL_R32I
&&
3250 var
->data
.image_format
!= GL_R32UI
&&
3251 !var
->data
.image_read_only
&&
3252 !var
->data
.image_write_only
) {
3253 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3254 "r32f, r32i or r32ui must be qualified `readonly' or "
3258 } else if (qual
->flags
.q
.read_only
||
3259 qual
->flags
.q
.write_only
||
3260 qual
->flags
.q
.coherent
||
3261 qual
->flags
.q
._volatile
||
3262 qual
->flags
.q
.restrict_flag
||
3263 qual
->flags
.q
.explicit_image_format
) {
3264 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3269 static inline const char*
3270 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3272 if (origin_upper_left
&& pixel_center_integer
)
3273 return "origin_upper_left, pixel_center_integer";
3274 else if (origin_upper_left
)
3275 return "origin_upper_left";
3276 else if (pixel_center_integer
)
3277 return "pixel_center_integer";
3283 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3284 const struct ast_type_qualifier
*qual
)
3286 /* If gl_FragCoord was previously declared, and the qualifiers were
3287 * different in any way, return true.
3289 if (state
->fs_redeclares_gl_fragcoord
) {
3290 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3291 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3298 validate_array_dimensions(const glsl_type
*t
,
3299 struct _mesa_glsl_parse_state
*state
,
3301 if (t
->is_array()) {
3302 t
= t
->fields
.array
;
3303 while (t
->is_array()) {
3304 if (t
->is_unsized_array()) {
3305 _mesa_glsl_error(loc
, state
,
3306 "only the outermost array dimension can "
3311 t
= t
->fields
.array
;
3317 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3319 struct _mesa_glsl_parse_state
*state
,
3322 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3324 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3326 * "Within any shader, the first redeclarations of gl_FragCoord
3327 * must appear before any use of gl_FragCoord."
3329 * Generate a compiler error if above condition is not met by the
3332 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3333 if (earlier
!= NULL
&&
3334 earlier
->data
.used
&&
3335 !state
->fs_redeclares_gl_fragcoord
) {
3336 _mesa_glsl_error(loc
, state
,
3337 "gl_FragCoord used before its first redeclaration "
3338 "in fragment shader");
3341 /* Make sure all gl_FragCoord redeclarations specify the same layout
3344 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3345 const char *const qual_string
=
3346 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3347 qual
->flags
.q
.pixel_center_integer
);
3349 const char *const state_string
=
3350 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3351 state
->fs_pixel_center_integer
);
3353 _mesa_glsl_error(loc
, state
,
3354 "gl_FragCoord redeclared with different layout "
3355 "qualifiers (%s) and (%s) ",
3359 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3360 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3361 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3362 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3363 state
->fs_redeclares_gl_fragcoord
=
3364 state
->fs_origin_upper_left
||
3365 state
->fs_pixel_center_integer
||
3366 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3369 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3370 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3371 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3372 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3373 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3374 ? "origin_upper_left" : "pixel_center_integer";
3376 _mesa_glsl_error(loc
, state
,
3377 "layout qualifier `%s' can only be applied to "
3378 "fragment shader input `gl_FragCoord'",
3382 if (qual
->flags
.q
.explicit_location
) {
3383 apply_explicit_location(qual
, var
, state
, loc
);
3385 if (qual
->flags
.q
.explicit_component
) {
3386 unsigned qual_component
;
3387 if (process_qualifier_constant(state
, loc
, "component",
3388 qual
->component
, &qual_component
)) {
3389 const glsl_type
*type
= var
->type
->without_array();
3390 unsigned components
= type
->component_slots();
3392 if (type
->is_matrix() || type
->is_record()) {
3393 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3394 "cannot be applied to a matrix, a structure, "
3395 "a block, or an array containing any of "
3397 } else if (qual_component
!= 0 &&
3398 (qual_component
+ components
- 1) > 3) {
3399 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3400 (qual_component
+ components
- 1));
3401 } else if (qual_component
== 1 && type
->is_64bit()) {
3402 /* We don't bother checking for 3 as it should be caught by the
3403 * overflow check above.
3405 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3406 "component 1 or 3");
3408 var
->data
.explicit_component
= true;
3409 var
->data
.location_frac
= qual_component
;
3413 } else if (qual
->flags
.q
.explicit_index
) {
3414 if (!qual
->flags
.q
.subroutine_def
)
3415 _mesa_glsl_error(loc
, state
,
3416 "explicit index requires explicit location");
3417 } else if (qual
->flags
.q
.explicit_component
) {
3418 _mesa_glsl_error(loc
, state
,
3419 "explicit component requires explicit location");
3422 if (qual
->flags
.q
.explicit_binding
) {
3423 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3426 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3427 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3428 unsigned qual_stream
;
3429 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3431 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3432 var
->data
.stream
= qual_stream
;
3436 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3437 unsigned qual_xfb_buffer
;
3438 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3439 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3440 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3441 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3442 if (qual
->flags
.q
.explicit_xfb_buffer
)
3443 var
->data
.explicit_xfb_buffer
= true;
3447 if (qual
->flags
.q
.explicit_xfb_offset
) {
3448 unsigned qual_xfb_offset
;
3449 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3451 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3452 qual
->offset
, &qual_xfb_offset
) &&
3453 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3454 var
->type
, component_size
)) {
3455 var
->data
.offset
= qual_xfb_offset
;
3456 var
->data
.explicit_xfb_offset
= true;
3460 if (qual
->flags
.q
.explicit_xfb_stride
) {
3461 unsigned qual_xfb_stride
;
3462 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3463 qual
->xfb_stride
, &qual_xfb_stride
)) {
3464 var
->data
.xfb_stride
= qual_xfb_stride
;
3465 var
->data
.explicit_xfb_stride
= true;
3469 if (var
->type
->contains_atomic()) {
3470 if (var
->data
.mode
== ir_var_uniform
) {
3471 if (var
->data
.explicit_binding
) {
3473 &state
->atomic_counter_offsets
[var
->data
.binding
];
3475 if (*offset
% ATOMIC_COUNTER_SIZE
)
3476 _mesa_glsl_error(loc
, state
,
3477 "misaligned atomic counter offset");
3479 var
->data
.offset
= *offset
;
3480 *offset
+= var
->type
->atomic_size();
3483 _mesa_glsl_error(loc
, state
,
3484 "atomic counters require explicit binding point");
3486 } else if (var
->data
.mode
!= ir_var_function_in
) {
3487 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3488 "function parameters or uniform-qualified "
3489 "global variables");
3493 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3494 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3495 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3496 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3497 * These extensions and all following extensions that add the 'layout'
3498 * keyword have been modified to require the use of 'in' or 'out'.
3500 * The following extension do not allow the deprecated keywords:
3502 * GL_AMD_conservative_depth
3503 * GL_ARB_conservative_depth
3504 * GL_ARB_gpu_shader5
3505 * GL_ARB_separate_shader_objects
3506 * GL_ARB_tessellation_shader
3507 * GL_ARB_transform_feedback3
3508 * GL_ARB_uniform_buffer_object
3510 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3511 * allow layout with the deprecated keywords.
3513 const bool relaxed_layout_qualifier_checking
=
3514 state
->ARB_fragment_coord_conventions_enable
;
3516 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3517 || qual
->flags
.q
.varying
;
3518 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3519 if (relaxed_layout_qualifier_checking
) {
3520 _mesa_glsl_warning(loc
, state
,
3521 "`layout' qualifier may not be used with "
3522 "`attribute' or `varying'");
3524 _mesa_glsl_error(loc
, state
,
3525 "`layout' qualifier may not be used with "
3526 "`attribute' or `varying'");
3530 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3531 * AMD_conservative_depth.
3533 int depth_layout_count
= qual
->flags
.q
.depth_any
3534 + qual
->flags
.q
.depth_greater
3535 + qual
->flags
.q
.depth_less
3536 + qual
->flags
.q
.depth_unchanged
;
3537 if (depth_layout_count
> 0
3538 && !state
->is_version(420, 0)
3539 && !state
->AMD_conservative_depth_enable
3540 && !state
->ARB_conservative_depth_enable
) {
3541 _mesa_glsl_error(loc
, state
,
3542 "extension GL_AMD_conservative_depth or "
3543 "GL_ARB_conservative_depth must be enabled "
3544 "to use depth layout qualifiers");
3545 } else if (depth_layout_count
> 0
3546 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3547 _mesa_glsl_error(loc
, state
,
3548 "depth layout qualifiers can be applied only to "
3550 } else if (depth_layout_count
> 1
3551 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3552 _mesa_glsl_error(loc
, state
,
3553 "at most one depth layout qualifier can be applied to "
3556 if (qual
->flags
.q
.depth_any
)
3557 var
->data
.depth_layout
= ir_depth_layout_any
;
3558 else if (qual
->flags
.q
.depth_greater
)
3559 var
->data
.depth_layout
= ir_depth_layout_greater
;
3560 else if (qual
->flags
.q
.depth_less
)
3561 var
->data
.depth_layout
= ir_depth_layout_less
;
3562 else if (qual
->flags
.q
.depth_unchanged
)
3563 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3565 var
->data
.depth_layout
= ir_depth_layout_none
;
3567 if (qual
->flags
.q
.std140
||
3568 qual
->flags
.q
.std430
||
3569 qual
->flags
.q
.packed
||
3570 qual
->flags
.q
.shared
) {
3571 _mesa_glsl_error(loc
, state
,
3572 "uniform and shader storage block layout qualifiers "
3573 "std140, std430, packed, and shared can only be "
3574 "applied to uniform or shader storage blocks, not "
3578 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3579 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3582 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3585 * "Fragment shaders also allow the following layout qualifier on in only
3586 * (not with variable declarations)
3587 * layout-qualifier-id
3588 * early_fragment_tests
3591 if (qual
->flags
.q
.early_fragment_tests
) {
3592 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3593 "valid in fragment shader input layout declaration.");
3598 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3600 struct _mesa_glsl_parse_state
*state
,
3604 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3606 if (qual
->flags
.q
.invariant
) {
3607 if (var
->data
.used
) {
3608 _mesa_glsl_error(loc
, state
,
3609 "variable `%s' may not be redeclared "
3610 "`invariant' after being used",
3613 var
->data
.invariant
= 1;
3617 if (qual
->flags
.q
.precise
) {
3618 if (var
->data
.used
) {
3619 _mesa_glsl_error(loc
, state
,
3620 "variable `%s' may not be redeclared "
3621 "`precise' after being used",
3624 var
->data
.precise
= 1;
3628 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3629 _mesa_glsl_error(loc
, state
,
3630 "`subroutine' may only be applied to uniforms, "
3631 "subroutine type declarations, or function definitions");
3634 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3635 || qual
->flags
.q
.uniform
3636 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3637 var
->data
.read_only
= 1;
3639 if (qual
->flags
.q
.centroid
)
3640 var
->data
.centroid
= 1;
3642 if (qual
->flags
.q
.sample
)
3643 var
->data
.sample
= 1;
3645 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3646 if (state
->es_shader
) {
3647 var
->data
.precision
=
3648 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3651 if (qual
->flags
.q
.patch
)
3652 var
->data
.patch
= 1;
3654 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3655 var
->type
= glsl_type::error_type
;
3656 _mesa_glsl_error(loc
, state
,
3657 "`attribute' variables may not be declared in the "
3659 _mesa_shader_stage_to_string(state
->stage
));
3662 /* Disallow layout qualifiers which may only appear on layout declarations. */
3663 if (qual
->flags
.q
.prim_type
) {
3664 _mesa_glsl_error(loc
, state
,
3665 "Primitive type may only be specified on GS input or output "
3666 "layout declaration, not on variables.");
3669 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3671 * "However, the const qualifier cannot be used with out or inout."
3673 * The same section of the GLSL 4.40 spec further clarifies this saying:
3675 * "The const qualifier cannot be used with out or inout, or a
3676 * compile-time error results."
3678 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3679 _mesa_glsl_error(loc
, state
,
3680 "`const' may not be applied to `out' or `inout' "
3681 "function parameters");
3684 /* If there is no qualifier that changes the mode of the variable, leave
3685 * the setting alone.
3687 assert(var
->data
.mode
!= ir_var_temporary
);
3688 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3689 var
->data
.mode
= ir_var_function_inout
;
3690 else if (qual
->flags
.q
.in
)
3691 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3692 else if (qual
->flags
.q
.attribute
3693 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3694 var
->data
.mode
= ir_var_shader_in
;
3695 else if (qual
->flags
.q
.out
)
3696 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3697 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3698 var
->data
.mode
= ir_var_shader_out
;
3699 else if (qual
->flags
.q
.uniform
)
3700 var
->data
.mode
= ir_var_uniform
;
3701 else if (qual
->flags
.q
.buffer
)
3702 var
->data
.mode
= ir_var_shader_storage
;
3703 else if (qual
->flags
.q
.shared_storage
)
3704 var
->data
.mode
= ir_var_shader_shared
;
3706 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3707 /* User-defined ins/outs are not permitted in compute shaders. */
3708 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3709 _mesa_glsl_error(loc
, state
,
3710 "user-defined input and output variables are not "
3711 "permitted in compute shaders");
3714 /* This variable is being used to link data between shader stages (in
3715 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3716 * that is allowed for such purposes.
3718 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3720 * "The varying qualifier can be used only with the data types
3721 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3724 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3725 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3727 * "Fragment inputs can only be signed and unsigned integers and
3728 * integer vectors, float, floating-point vectors, matrices, or
3729 * arrays of these. Structures cannot be input.
3731 * Similar text exists in the section on vertex shader outputs.
3733 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3734 * 3.00 spec allows structs as well. Varying structs are also allowed
3737 switch (var
->type
->get_scalar_type()->base_type
) {
3738 case GLSL_TYPE_FLOAT
:
3739 /* Ok in all GLSL versions */
3741 case GLSL_TYPE_UINT
:
3743 if (state
->is_version(130, 300))
3745 _mesa_glsl_error(loc
, state
,
3746 "varying variables must be of base type float in %s",
3747 state
->get_version_string());
3749 case GLSL_TYPE_STRUCT
:
3750 if (state
->is_version(150, 300))
3752 _mesa_glsl_error(loc
, state
,
3753 "varying variables may not be of type struct");
3755 case GLSL_TYPE_DOUBLE
:
3758 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3763 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3764 switch (state
->stage
) {
3765 case MESA_SHADER_VERTEX
:
3766 if (var
->data
.mode
== ir_var_shader_out
)
3767 var
->data
.invariant
= true;
3769 case MESA_SHADER_TESS_CTRL
:
3770 case MESA_SHADER_TESS_EVAL
:
3771 case MESA_SHADER_GEOMETRY
:
3772 if ((var
->data
.mode
== ir_var_shader_in
)
3773 || (var
->data
.mode
== ir_var_shader_out
))
3774 var
->data
.invariant
= true;
3776 case MESA_SHADER_FRAGMENT
:
3777 if (var
->data
.mode
== ir_var_shader_in
)
3778 var
->data
.invariant
= true;
3780 case MESA_SHADER_COMPUTE
:
3781 /* Invariance isn't meaningful in compute shaders. */
3786 var
->data
.interpolation
=
3787 interpret_interpolation_qualifier(qual
, var
->type
,
3788 (ir_variable_mode
) var
->data
.mode
,
3791 /* Does the declaration use the deprecated 'attribute' or 'varying'
3794 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3795 || qual
->flags
.q
.varying
;
3798 /* Validate auxiliary storage qualifiers */
3800 /* From section 4.3.4 of the GLSL 1.30 spec:
3801 * "It is an error to use centroid in in a vertex shader."
3803 * From section 4.3.4 of the GLSL ES 3.00 spec:
3804 * "It is an error to use centroid in or interpolation qualifiers in
3805 * a vertex shader input."
3808 /* Section 4.3.6 of the GLSL 1.30 specification states:
3809 * "It is an error to use centroid out in a fragment shader."
3811 * The GL_ARB_shading_language_420pack extension specification states:
3812 * "It is an error to use auxiliary storage qualifiers or interpolation
3813 * qualifiers on an output in a fragment shader."
3815 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3816 _mesa_glsl_error(loc
, state
,
3817 "sample qualifier may only be used on `in` or `out` "
3818 "variables between shader stages");
3820 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3821 _mesa_glsl_error(loc
, state
,
3822 "centroid qualifier may only be used with `in', "
3823 "`out' or `varying' variables between shader stages");
3826 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3827 _mesa_glsl_error(loc
, state
,
3828 "the shared storage qualifiers can only be used with "
3832 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3836 * Get the variable that is being redeclared by this declaration
3838 * Semantic checks to verify the validity of the redeclaration are also
3839 * performed. If semantic checks fail, compilation error will be emitted via
3840 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3843 * A pointer to an existing variable in the current scope if the declaration
3844 * is a redeclaration, \c NULL otherwise.
3846 static ir_variable
*
3847 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3848 struct _mesa_glsl_parse_state
*state
,
3849 bool allow_all_redeclarations
)
3851 /* Check if this declaration is actually a re-declaration, either to
3852 * resize an array or add qualifiers to an existing variable.
3854 * This is allowed for variables in the current scope, or when at
3855 * global scope (for built-ins in the implicit outer scope).
3857 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3858 if (earlier
== NULL
||
3859 (state
->current_function
!= NULL
&&
3860 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3865 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3867 * "It is legal to declare an array without a size and then
3868 * later re-declare the same name as an array of the same
3869 * type and specify a size."
3871 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3872 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3873 /* FINISHME: This doesn't match the qualifiers on the two
3874 * FINISHME: declarations. It's not 100% clear whether this is
3875 * FINISHME: required or not.
3878 const int size
= var
->type
->array_size();
3879 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3880 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3881 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3883 earlier
->data
.max_array_access
);
3886 earlier
->type
= var
->type
;
3889 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3890 state
->is_version(150, 0))
3891 && strcmp(var
->name
, "gl_FragCoord") == 0
3892 && earlier
->type
== var
->type
3893 && var
->data
.mode
== ir_var_shader_in
) {
3894 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3897 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3898 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3900 /* According to section 4.3.7 of the GLSL 1.30 spec,
3901 * the following built-in varaibles can be redeclared with an
3902 * interpolation qualifier:
3905 * * gl_FrontSecondaryColor
3906 * * gl_BackSecondaryColor
3908 * * gl_SecondaryColor
3910 } else if (state
->is_version(130, 0)
3911 && (strcmp(var
->name
, "gl_FrontColor") == 0
3912 || strcmp(var
->name
, "gl_BackColor") == 0
3913 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3914 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3915 || strcmp(var
->name
, "gl_Color") == 0
3916 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3917 && earlier
->type
== var
->type
3918 && earlier
->data
.mode
== var
->data
.mode
) {
3919 earlier
->data
.interpolation
= var
->data
.interpolation
;
3921 /* Layout qualifiers for gl_FragDepth. */
3922 } else if ((state
->is_version(420, 0) ||
3923 state
->AMD_conservative_depth_enable
||
3924 state
->ARB_conservative_depth_enable
)
3925 && strcmp(var
->name
, "gl_FragDepth") == 0
3926 && earlier
->type
== var
->type
3927 && earlier
->data
.mode
== var
->data
.mode
) {
3929 /** From the AMD_conservative_depth spec:
3930 * Within any shader, the first redeclarations of gl_FragDepth
3931 * must appear before any use of gl_FragDepth.
3933 if (earlier
->data
.used
) {
3934 _mesa_glsl_error(&loc
, state
,
3935 "the first redeclaration of gl_FragDepth "
3936 "must appear before any use of gl_FragDepth");
3939 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3940 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3941 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3942 _mesa_glsl_error(&loc
, state
,
3943 "gl_FragDepth: depth layout is declared here "
3944 "as '%s, but it was previously declared as "
3946 depth_layout_string(var
->data
.depth_layout
),
3947 depth_layout_string(earlier
->data
.depth_layout
));
3950 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3952 } else if (allow_all_redeclarations
) {
3953 if (earlier
->data
.mode
!= var
->data
.mode
) {
3954 _mesa_glsl_error(&loc
, state
,
3955 "redeclaration of `%s' with incorrect qualifiers",
3957 } else if (earlier
->type
!= var
->type
) {
3958 _mesa_glsl_error(&loc
, state
,
3959 "redeclaration of `%s' has incorrect type",
3963 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3970 * Generate the IR for an initializer in a variable declaration
3973 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3974 ast_fully_specified_type
*type
,
3975 exec_list
*initializer_instructions
,
3976 struct _mesa_glsl_parse_state
*state
)
3978 ir_rvalue
*result
= NULL
;
3980 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3982 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3984 * "All uniform variables are read-only and are initialized either
3985 * directly by an application via API commands, or indirectly by
3988 if (var
->data
.mode
== ir_var_uniform
) {
3989 state
->check_version(120, 0, &initializer_loc
,
3990 "cannot initialize uniform %s",
3994 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3996 * "Buffer variables cannot have initializers."
3998 if (var
->data
.mode
== ir_var_shader_storage
) {
3999 _mesa_glsl_error(&initializer_loc
, state
,
4000 "cannot initialize buffer variable %s",
4004 /* From section 4.1.7 of the GLSL 4.40 spec:
4006 * "Opaque variables [...] are initialized only through the
4007 * OpenGL API; they cannot be declared with an initializer in a
4010 if (var
->type
->contains_opaque()) {
4011 _mesa_glsl_error(&initializer_loc
, state
,
4012 "cannot initialize opaque variable %s",
4016 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4017 _mesa_glsl_error(&initializer_loc
, state
,
4018 "cannot initialize %s shader input / %s %s",
4019 _mesa_shader_stage_to_string(state
->stage
),
4020 (state
->stage
== MESA_SHADER_VERTEX
)
4021 ? "attribute" : "varying",
4025 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4026 _mesa_glsl_error(&initializer_loc
, state
,
4027 "cannot initialize %s shader output %s",
4028 _mesa_shader_stage_to_string(state
->stage
),
4032 /* If the initializer is an ast_aggregate_initializer, recursively store
4033 * type information from the LHS into it, so that its hir() function can do
4036 if (decl
->initializer
->oper
== ast_aggregate
)
4037 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4039 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4040 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4042 /* Calculate the constant value if this is a const or uniform
4045 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4047 * "Declarations of globals without a storage qualifier, or with
4048 * just the const qualifier, may include initializers, in which case
4049 * they will be initialized before the first line of main() is
4050 * executed. Such initializers must be a constant expression."
4052 * The same section of the GLSL ES 3.00.4 spec has similar language.
4054 if (type
->qualifier
.flags
.q
.constant
4055 || type
->qualifier
.flags
.q
.uniform
4056 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4057 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4059 if (new_rhs
!= NULL
) {
4062 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4065 * "A constant expression is one of
4069 * - an expression formed by an operator on operands that are
4070 * all constant expressions, including getting an element of
4071 * a constant array, or a field of a constant structure, or
4072 * components of a constant vector. However, the sequence
4073 * operator ( , ) and the assignment operators ( =, +=, ...)
4074 * are not included in the operators that can create a
4075 * constant expression."
4077 * Section 12.43 (Sequence operator and constant expressions) says:
4079 * "Should the following construct be allowed?
4083 * The expression within the brackets uses the sequence operator
4084 * (',') and returns the integer 3 so the construct is declaring
4085 * a single-dimensional array of size 3. In some languages, the
4086 * construct declares a two-dimensional array. It would be
4087 * preferable to make this construct illegal to avoid confusion.
4089 * One possibility is to change the definition of the sequence
4090 * operator so that it does not return a constant-expression and
4091 * hence cannot be used to declare an array size.
4093 * RESOLUTION: The result of a sequence operator is not a
4094 * constant-expression."
4096 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4097 * contains language almost identical to the section 4.3.3 in the
4098 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4101 ir_constant
*constant_value
= rhs
->constant_expression_value();
4102 if (!constant_value
||
4103 (state
->is_version(430, 300) &&
4104 decl
->initializer
->has_sequence_subexpression())) {
4105 const char *const variable_mode
=
4106 (type
->qualifier
.flags
.q
.constant
)
4108 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4110 /* If ARB_shading_language_420pack is enabled, initializers of
4111 * const-qualified local variables do not have to be constant
4112 * expressions. Const-qualified global variables must still be
4113 * initialized with constant expressions.
4115 if (!state
->has_420pack()
4116 || state
->current_function
== NULL
) {
4117 _mesa_glsl_error(& initializer_loc
, state
,
4118 "initializer of %s variable `%s' must be a "
4119 "constant expression",
4122 if (var
->type
->is_numeric()) {
4123 /* Reduce cascading errors. */
4124 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4125 ? ir_constant::zero(state
, var
->type
) : NULL
;
4129 rhs
= constant_value
;
4130 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4131 ? constant_value
: NULL
;
4134 if (var
->type
->is_numeric()) {
4135 /* Reduce cascading errors. */
4136 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4137 ? ir_constant::zero(state
, var
->type
) : NULL
;
4142 if (rhs
&& !rhs
->type
->is_error()) {
4143 bool temp
= var
->data
.read_only
;
4144 if (type
->qualifier
.flags
.q
.constant
)
4145 var
->data
.read_only
= false;
4147 /* Never emit code to initialize a uniform.
4149 const glsl_type
*initializer_type
;
4150 if (!type
->qualifier
.flags
.q
.uniform
) {
4151 do_assignment(initializer_instructions
, state
,
4156 type
->get_location());
4157 initializer_type
= result
->type
;
4159 initializer_type
= rhs
->type
;
4161 var
->constant_initializer
= rhs
->constant_expression_value();
4162 var
->data
.has_initializer
= true;
4164 /* If the declared variable is an unsized array, it must inherrit
4165 * its full type from the initializer. A declaration such as
4167 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4171 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4173 * The assignment generated in the if-statement (below) will also
4174 * automatically handle this case for non-uniforms.
4176 * If the declared variable is not an array, the types must
4177 * already match exactly. As a result, the type assignment
4178 * here can be done unconditionally. For non-uniforms the call
4179 * to do_assignment can change the type of the initializer (via
4180 * the implicit conversion rules). For uniforms the initializer
4181 * must be a constant expression, and the type of that expression
4182 * was validated above.
4184 var
->type
= initializer_type
;
4186 var
->data
.read_only
= temp
;
4193 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4194 YYLTYPE loc
, ir_variable
*var
,
4195 unsigned num_vertices
,
4197 const char *var_category
)
4199 if (var
->type
->is_unsized_array()) {
4200 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4202 * All geometry shader input unsized array declarations will be
4203 * sized by an earlier input layout qualifier, when present, as per
4204 * the following table.
4206 * Followed by a table mapping each allowed input layout qualifier to
4207 * the corresponding input length.
4209 * Similarly for tessellation control shader outputs.
4211 if (num_vertices
!= 0)
4212 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4215 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4216 * includes the following examples of compile-time errors:
4218 * // code sequence within one shader...
4219 * in vec4 Color1[]; // size unknown
4220 * ...Color1.length()...// illegal, length() unknown
4221 * in vec4 Color2[2]; // size is 2
4222 * ...Color1.length()...// illegal, Color1 still has no size
4223 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4224 * layout(lines) in; // legal, input size is 2, matching
4225 * in vec4 Color4[3]; // illegal, contradicts layout
4228 * To detect the case illustrated by Color3, we verify that the size of
4229 * an explicitly-sized array matches the size of any previously declared
4230 * explicitly-sized array. To detect the case illustrated by Color4, we
4231 * verify that the size of an explicitly-sized array is consistent with
4232 * any previously declared input layout.
4234 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4235 _mesa_glsl_error(&loc
, state
,
4236 "%s size contradicts previously declared layout "
4237 "(size is %u, but layout requires a size of %u)",
4238 var_category
, var
->type
->length
, num_vertices
);
4239 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4240 _mesa_glsl_error(&loc
, state
,
4241 "%s sizes are inconsistent (size is %u, but a "
4242 "previous declaration has size %u)",
4243 var_category
, var
->type
->length
, *size
);
4245 *size
= var
->type
->length
;
4251 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4252 YYLTYPE loc
, ir_variable
*var
)
4254 unsigned num_vertices
= 0;
4256 if (state
->tcs_output_vertices_specified
) {
4257 if (!state
->out_qualifier
->vertices
->
4258 process_qualifier_constant(state
, "vertices",
4259 &num_vertices
, false)) {
4263 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4264 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4265 "GL_MAX_PATCH_VERTICES", num_vertices
);
4270 if (!var
->type
->is_array() && !var
->data
.patch
) {
4271 _mesa_glsl_error(&loc
, state
,
4272 "tessellation control shader outputs must be arrays");
4274 /* To avoid cascading failures, short circuit the checks below. */
4278 if (var
->data
.patch
)
4281 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4282 &state
->tcs_output_size
,
4283 "tessellation control shader output");
4287 * Do additional processing necessary for tessellation control/evaluation shader
4288 * input declarations. This covers both interface block arrays and bare input
4292 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4293 YYLTYPE loc
, ir_variable
*var
)
4295 if (!var
->type
->is_array() && !var
->data
.patch
) {
4296 _mesa_glsl_error(&loc
, state
,
4297 "per-vertex tessellation shader inputs must be arrays");
4298 /* Avoid cascading failures. */
4302 if (var
->data
.patch
)
4305 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
4306 if (var
->type
->is_unsized_array()) {
4307 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4308 state
->Const
.MaxPatchVertices
);
4314 * Do additional processing necessary for geometry shader input declarations
4315 * (this covers both interface blocks arrays and bare input variables).
4318 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4319 YYLTYPE loc
, ir_variable
*var
)
4321 unsigned num_vertices
= 0;
4323 if (state
->gs_input_prim_type_specified
) {
4324 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4327 /* Geometry shader input variables must be arrays. Caller should have
4328 * reported an error for this.
4330 if (!var
->type
->is_array()) {
4331 assert(state
->error
);
4333 /* To avoid cascading failures, short circuit the checks below. */
4337 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4338 &state
->gs_input_size
,
4339 "geometry shader input");
4343 validate_identifier(const char *identifier
, YYLTYPE loc
,
4344 struct _mesa_glsl_parse_state
*state
)
4346 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4348 * "Identifiers starting with "gl_" are reserved for use by
4349 * OpenGL, and may not be declared in a shader as either a
4350 * variable or a function."
4352 if (is_gl_identifier(identifier
)) {
4353 _mesa_glsl_error(&loc
, state
,
4354 "identifier `%s' uses reserved `gl_' prefix",
4356 } else if (strstr(identifier
, "__")) {
4357 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4360 * "In addition, all identifiers containing two
4361 * consecutive underscores (__) are reserved as
4362 * possible future keywords."
4364 * The intention is that names containing __ are reserved for internal
4365 * use by the implementation, and names prefixed with GL_ are reserved
4366 * for use by Khronos. Names simply containing __ are dangerous to use,
4367 * but should be allowed.
4369 * A future version of the GLSL specification will clarify this.
4371 _mesa_glsl_warning(&loc
, state
,
4372 "identifier `%s' uses reserved `__' string",
4378 ast_declarator_list::hir(exec_list
*instructions
,
4379 struct _mesa_glsl_parse_state
*state
)
4382 const struct glsl_type
*decl_type
;
4383 const char *type_name
= NULL
;
4384 ir_rvalue
*result
= NULL
;
4385 YYLTYPE loc
= this->get_location();
4387 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4389 * "To ensure that a particular output variable is invariant, it is
4390 * necessary to use the invariant qualifier. It can either be used to
4391 * qualify a previously declared variable as being invariant
4393 * invariant gl_Position; // make existing gl_Position be invariant"
4395 * In these cases the parser will set the 'invariant' flag in the declarator
4396 * list, and the type will be NULL.
4398 if (this->invariant
) {
4399 assert(this->type
== NULL
);
4401 if (state
->current_function
!= NULL
) {
4402 _mesa_glsl_error(& loc
, state
,
4403 "all uses of `invariant' keyword must be at global "
4407 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4408 assert(decl
->array_specifier
== NULL
);
4409 assert(decl
->initializer
== NULL
);
4411 ir_variable
*const earlier
=
4412 state
->symbols
->get_variable(decl
->identifier
);
4413 if (earlier
== NULL
) {
4414 _mesa_glsl_error(& loc
, state
,
4415 "undeclared variable `%s' cannot be marked "
4416 "invariant", decl
->identifier
);
4417 } else if (!is_varying_var(earlier
, state
->stage
)) {
4418 _mesa_glsl_error(&loc
, state
,
4419 "`%s' cannot be marked invariant; interfaces between "
4420 "shader stages only.", decl
->identifier
);
4421 } else if (earlier
->data
.used
) {
4422 _mesa_glsl_error(& loc
, state
,
4423 "variable `%s' may not be redeclared "
4424 "`invariant' after being used",
4427 earlier
->data
.invariant
= true;
4431 /* Invariant redeclarations do not have r-values.
4436 if (this->precise
) {
4437 assert(this->type
== NULL
);
4439 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4440 assert(decl
->array_specifier
== NULL
);
4441 assert(decl
->initializer
== NULL
);
4443 ir_variable
*const earlier
=
4444 state
->symbols
->get_variable(decl
->identifier
);
4445 if (earlier
== NULL
) {
4446 _mesa_glsl_error(& loc
, state
,
4447 "undeclared variable `%s' cannot be marked "
4448 "precise", decl
->identifier
);
4449 } else if (state
->current_function
!= NULL
&&
4450 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4451 /* Note: we have to check if we're in a function, since
4452 * builtins are treated as having come from another scope.
4454 _mesa_glsl_error(& loc
, state
,
4455 "variable `%s' from an outer scope may not be "
4456 "redeclared `precise' in this scope",
4458 } else if (earlier
->data
.used
) {
4459 _mesa_glsl_error(& loc
, state
,
4460 "variable `%s' may not be redeclared "
4461 "`precise' after being used",
4464 earlier
->data
.precise
= true;
4468 /* Precise redeclarations do not have r-values either. */
4472 assert(this->type
!= NULL
);
4473 assert(!this->invariant
);
4474 assert(!this->precise
);
4476 /* The type specifier may contain a structure definition. Process that
4477 * before any of the variable declarations.
4479 (void) this->type
->specifier
->hir(instructions
, state
);
4481 decl_type
= this->type
->glsl_type(& type_name
, state
);
4483 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4484 * "Buffer variables may only be declared inside interface blocks
4485 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4486 * shader storage blocks. It is a compile-time error to declare buffer
4487 * variables at global scope (outside a block)."
4489 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4490 _mesa_glsl_error(&loc
, state
,
4491 "buffer variables cannot be declared outside "
4492 "interface blocks");
4495 /* An offset-qualified atomic counter declaration sets the default
4496 * offset for the next declaration within the same atomic counter
4499 if (decl_type
&& decl_type
->contains_atomic()) {
4500 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4501 type
->qualifier
.flags
.q
.explicit_offset
) {
4502 unsigned qual_binding
;
4503 unsigned qual_offset
;
4504 if (process_qualifier_constant(state
, &loc
, "binding",
4505 type
->qualifier
.binding
,
4507 && process_qualifier_constant(state
, &loc
, "offset",
4508 type
->qualifier
.offset
,
4510 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4514 ast_type_qualifier allowed_atomic_qual_mask
;
4515 allowed_atomic_qual_mask
.flags
.i
= 0;
4516 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4517 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4518 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4520 type
->qualifier
.validate_flags(&loc
, state
,
4521 "invalid layout qualifier for "
4523 allowed_atomic_qual_mask
);
4526 if (this->declarations
.is_empty()) {
4527 /* If there is no structure involved in the program text, there are two
4528 * possible scenarios:
4530 * - The program text contained something like 'vec4;'. This is an
4531 * empty declaration. It is valid but weird. Emit a warning.
4533 * - The program text contained something like 'S;' and 'S' is not the
4534 * name of a known structure type. This is both invalid and weird.
4537 * - The program text contained something like 'mediump float;'
4538 * when the programmer probably meant 'precision mediump
4539 * float;' Emit a warning with a description of what they
4540 * probably meant to do.
4542 * Note that if decl_type is NULL and there is a structure involved,
4543 * there must have been some sort of error with the structure. In this
4544 * case we assume that an error was already generated on this line of
4545 * code for the structure. There is no need to generate an additional,
4548 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4551 if (decl_type
== NULL
) {
4552 _mesa_glsl_error(&loc
, state
,
4553 "invalid type `%s' in empty declaration",
4556 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4557 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4560 * "... any declaration that leaves the size undefined is
4561 * disallowed as this would add complexity and there are no
4564 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4565 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4566 "or implicitly defined");
4569 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4571 * "The combinations of types and qualifiers that cause
4572 * compile-time or link-time errors are the same whether or not
4573 * the declaration is empty."
4575 validate_array_dimensions(decl_type
, state
, &loc
);
4578 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4579 /* Empty atomic counter declarations are allowed and useful
4580 * to set the default offset qualifier.
4583 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4584 if (this->type
->specifier
->structure
!= NULL
) {
4585 _mesa_glsl_error(&loc
, state
,
4586 "precision qualifiers can't be applied "
4589 static const char *const precision_names
[] = {
4596 _mesa_glsl_warning(&loc
, state
,
4597 "empty declaration with precision "
4598 "qualifier, to set the default precision, "
4599 "use `precision %s %s;'",
4600 precision_names
[this->type
->
4601 qualifier
.precision
],
4604 } else if (this->type
->specifier
->structure
== NULL
) {
4605 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4610 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4611 const struct glsl_type
*var_type
;
4613 const char *identifier
= decl
->identifier
;
4614 /* FINISHME: Emit a warning if a variable declaration shadows a
4615 * FINISHME: declaration at a higher scope.
4618 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4619 if (type_name
!= NULL
) {
4620 _mesa_glsl_error(& loc
, state
,
4621 "invalid type `%s' in declaration of `%s'",
4622 type_name
, decl
->identifier
);
4624 _mesa_glsl_error(& loc
, state
,
4625 "invalid type in declaration of `%s'",
4631 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4635 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4637 _mesa_glsl_error(& loc
, state
,
4638 "invalid type in declaration of `%s'",
4640 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4645 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4648 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4650 /* The 'varying in' and 'varying out' qualifiers can only be used with
4651 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4654 if (this->type
->qualifier
.flags
.q
.varying
) {
4655 if (this->type
->qualifier
.flags
.q
.in
) {
4656 _mesa_glsl_error(& loc
, state
,
4657 "`varying in' qualifier in declaration of "
4658 "`%s' only valid for geometry shaders using "
4659 "ARB_geometry_shader4 or EXT_geometry_shader4",
4661 } else if (this->type
->qualifier
.flags
.q
.out
) {
4662 _mesa_glsl_error(& loc
, state
,
4663 "`varying out' qualifier in declaration of "
4664 "`%s' only valid for geometry shaders using "
4665 "ARB_geometry_shader4 or EXT_geometry_shader4",
4670 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4672 * "Global variables can only use the qualifiers const,
4673 * attribute, uniform, or varying. Only one may be
4676 * Local variables can only use the qualifier const."
4678 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4679 * any extension that adds the 'layout' keyword.
4681 if (!state
->is_version(130, 300)
4682 && !state
->has_explicit_attrib_location()
4683 && !state
->has_separate_shader_objects()
4684 && !state
->ARB_fragment_coord_conventions_enable
) {
4685 if (this->type
->qualifier
.flags
.q
.out
) {
4686 _mesa_glsl_error(& loc
, state
,
4687 "`out' qualifier in declaration of `%s' "
4688 "only valid for function parameters in %s",
4689 decl
->identifier
, state
->get_version_string());
4691 if (this->type
->qualifier
.flags
.q
.in
) {
4692 _mesa_glsl_error(& loc
, state
,
4693 "`in' qualifier in declaration of `%s' "
4694 "only valid for function parameters in %s",
4695 decl
->identifier
, state
->get_version_string());
4697 /* FINISHME: Test for other invalid qualifiers. */
4700 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4702 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4705 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
4706 && (var
->type
->is_numeric() || var
->type
->is_boolean())
4707 && state
->zero_init
) {
4708 const ir_constant_data data
= {0};
4709 var
->data
.has_initializer
= true;
4710 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
4713 if (this->type
->qualifier
.flags
.q
.invariant
) {
4714 if (!is_varying_var(var
, state
->stage
)) {
4715 _mesa_glsl_error(&loc
, state
,
4716 "`%s' cannot be marked invariant; interfaces between "
4717 "shader stages only", var
->name
);
4721 if (state
->current_function
!= NULL
) {
4722 const char *mode
= NULL
;
4723 const char *extra
= "";
4725 /* There is no need to check for 'inout' here because the parser will
4726 * only allow that in function parameter lists.
4728 if (this->type
->qualifier
.flags
.q
.attribute
) {
4730 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4731 mode
= "subroutine uniform";
4732 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4734 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4736 } else if (this->type
->qualifier
.flags
.q
.in
) {
4738 extra
= " or in function parameter list";
4739 } else if (this->type
->qualifier
.flags
.q
.out
) {
4741 extra
= " or in function parameter list";
4745 _mesa_glsl_error(& loc
, state
,
4746 "%s variable `%s' must be declared at "
4748 mode
, var
->name
, extra
);
4750 } else if (var
->data
.mode
== ir_var_shader_in
) {
4751 var
->data
.read_only
= true;
4753 if (state
->stage
== MESA_SHADER_VERTEX
) {
4754 bool error_emitted
= false;
4756 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4758 * "Vertex shader inputs can only be float, floating-point
4759 * vectors, matrices, signed and unsigned integers and integer
4760 * vectors. Vertex shader inputs can also form arrays of these
4761 * types, but not structures."
4763 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4765 * "Vertex shader inputs can only be float, floating-point
4766 * vectors, matrices, signed and unsigned integers and integer
4767 * vectors. They cannot be arrays or structures."
4769 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4771 * "The attribute qualifier can be used only with float,
4772 * floating-point vectors, and matrices. Attribute variables
4773 * cannot be declared as arrays or structures."
4775 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4777 * "Vertex shader inputs can only be float, floating-point
4778 * vectors, matrices, signed and unsigned integers and integer
4779 * vectors. Vertex shader inputs cannot be arrays or
4782 const glsl_type
*check_type
= var
->type
->without_array();
4784 switch (check_type
->base_type
) {
4785 case GLSL_TYPE_FLOAT
:
4787 case GLSL_TYPE_UINT
:
4789 if (state
->is_version(120, 300))
4791 case GLSL_TYPE_DOUBLE
:
4792 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4796 _mesa_glsl_error(& loc
, state
,
4797 "vertex shader input / attribute cannot have "
4799 var
->type
->is_array() ? "array of " : "",
4801 error_emitted
= true;
4804 if (!error_emitted
&& var
->type
->is_array() &&
4805 !state
->check_version(150, 0, &loc
,
4806 "vertex shader input / attribute "
4807 "cannot have array type")) {
4808 error_emitted
= true;
4810 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4811 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4813 * Geometry shader input variables get the per-vertex values
4814 * written out by vertex shader output variables of the same
4815 * names. Since a geometry shader operates on a set of
4816 * vertices, each input varying variable (or input block, see
4817 * interface blocks below) needs to be declared as an array.
4819 if (!var
->type
->is_array()) {
4820 _mesa_glsl_error(&loc
, state
,
4821 "geometry shader inputs must be arrays");
4824 handle_geometry_shader_input_decl(state
, loc
, var
);
4825 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4826 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4828 * It is a compile-time error to declare a fragment shader
4829 * input with, or that contains, any of the following types:
4833 * * An array of arrays
4834 * * An array of structures
4835 * * A structure containing an array
4836 * * A structure containing a structure
4838 if (state
->es_shader
) {
4839 const glsl_type
*check_type
= var
->type
->without_array();
4840 if (check_type
->is_boolean() ||
4841 check_type
->contains_opaque()) {
4842 _mesa_glsl_error(&loc
, state
,
4843 "fragment shader input cannot have type %s",
4846 if (var
->type
->is_array() &&
4847 var
->type
->fields
.array
->is_array()) {
4848 _mesa_glsl_error(&loc
, state
,
4850 "cannot have an array of arrays",
4851 _mesa_shader_stage_to_string(state
->stage
));
4853 if (var
->type
->is_array() &&
4854 var
->type
->fields
.array
->is_record()) {
4855 _mesa_glsl_error(&loc
, state
,
4856 "fragment shader input "
4857 "cannot have an array of structs");
4859 if (var
->type
->is_record()) {
4860 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4861 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4862 var
->type
->fields
.structure
[i
].type
->is_record())
4863 _mesa_glsl_error(&loc
, state
,
4864 "fragement shader input cannot have "
4865 "a struct that contains an "
4870 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4871 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4872 handle_tess_shader_input_decl(state
, loc
, var
);
4874 } else if (var
->data
.mode
== ir_var_shader_out
) {
4875 const glsl_type
*check_type
= var
->type
->without_array();
4877 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4879 * It is a compile-time error to declare a vertex, tessellation
4880 * evaluation, tessellation control, or geometry shader output
4881 * that contains any of the following:
4883 * * A Boolean type (bool, bvec2 ...)
4886 if (check_type
->is_boolean() || check_type
->contains_opaque())
4887 _mesa_glsl_error(&loc
, state
,
4888 "%s shader output cannot have type %s",
4889 _mesa_shader_stage_to_string(state
->stage
),
4892 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4894 * It is a compile-time error to declare a fragment shader output
4895 * that contains any of the following:
4897 * * A Boolean type (bool, bvec2 ...)
4898 * * A double-precision scalar or vector (double, dvec2 ...)
4903 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4904 if (check_type
->is_record() || check_type
->is_matrix())
4905 _mesa_glsl_error(&loc
, state
,
4906 "fragment shader output "
4907 "cannot have struct or matrix type");
4908 switch (check_type
->base_type
) {
4909 case GLSL_TYPE_UINT
:
4911 case GLSL_TYPE_FLOAT
:
4914 _mesa_glsl_error(&loc
, state
,
4915 "fragment shader output cannot have "
4916 "type %s", check_type
->name
);
4920 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4922 * It is a compile-time error to declare a vertex shader output
4923 * with, or that contains, any of the following types:
4927 * * An array of arrays
4928 * * An array of structures
4929 * * A structure containing an array
4930 * * A structure containing a structure
4932 * It is a compile-time error to declare a fragment shader output
4933 * with, or that contains, any of the following types:
4939 * * An array of array
4941 if (state
->es_shader
) {
4942 if (var
->type
->is_array() &&
4943 var
->type
->fields
.array
->is_array()) {
4944 _mesa_glsl_error(&loc
, state
,
4946 "cannot have an array of arrays",
4947 _mesa_shader_stage_to_string(state
->stage
));
4949 if (state
->stage
== MESA_SHADER_VERTEX
) {
4950 if (var
->type
->is_array() &&
4951 var
->type
->fields
.array
->is_record()) {
4952 _mesa_glsl_error(&loc
, state
,
4953 "vertex shader output "
4954 "cannot have an array of structs");
4956 if (var
->type
->is_record()) {
4957 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4958 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4959 var
->type
->fields
.structure
[i
].type
->is_record())
4960 _mesa_glsl_error(&loc
, state
,
4961 "vertex shader output cannot have a "
4962 "struct that contains an "
4969 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4970 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4972 } else if (var
->type
->contains_subroutine()) {
4973 /* declare subroutine uniforms as hidden */
4974 var
->data
.how_declared
= ir_var_hidden
;
4977 /* From section 4.3.4 of the GLSL 4.00 spec:
4978 * "Input variables may not be declared using the patch in qualifier
4979 * in tessellation control or geometry shaders."
4981 * From section 4.3.6 of the GLSL 4.00 spec:
4982 * "It is an error to use patch out in a vertex, tessellation
4983 * evaluation, or geometry shader."
4985 * This doesn't explicitly forbid using them in a fragment shader, but
4986 * that's probably just an oversight.
4988 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4989 && this->type
->qualifier
.flags
.q
.patch
4990 && this->type
->qualifier
.flags
.q
.in
) {
4992 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4993 "tessellation evaluation shader");
4996 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4997 && this->type
->qualifier
.flags
.q
.patch
4998 && this->type
->qualifier
.flags
.q
.out
) {
5000 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5001 "tessellation control shader");
5004 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5006 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5007 state
->check_precision_qualifiers_allowed(&loc
);
5010 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5011 !precision_qualifier_allowed(var
->type
)) {
5012 _mesa_glsl_error(&loc
, state
,
5013 "precision qualifiers apply only to floating point"
5014 ", integer and opaque types");
5017 /* From section 4.1.7 of the GLSL 4.40 spec:
5019 * "[Opaque types] can only be declared as function
5020 * parameters or uniform-qualified variables."
5022 if (var_type
->contains_opaque() &&
5023 !this->type
->qualifier
.flags
.q
.uniform
) {
5024 _mesa_glsl_error(&loc
, state
,
5025 "opaque variables must be declared uniform");
5028 /* Process the initializer and add its instructions to a temporary
5029 * list. This list will be added to the instruction stream (below) after
5030 * the declaration is added. This is done because in some cases (such as
5031 * redeclarations) the declaration may not actually be added to the
5032 * instruction stream.
5034 exec_list initializer_instructions
;
5036 /* Examine var name here since var may get deleted in the next call */
5037 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5039 ir_variable
*earlier
=
5040 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5041 false /* allow_all_redeclarations */);
5042 if (earlier
!= NULL
) {
5044 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
5045 _mesa_glsl_error(&loc
, state
,
5046 "`%s' has already been redeclared using "
5047 "gl_PerVertex", earlier
->name
);
5049 earlier
->data
.how_declared
= ir_var_declared_normally
;
5052 if (decl
->initializer
!= NULL
) {
5053 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
5055 &initializer_instructions
, state
);
5057 validate_array_dimensions(var_type
, state
, &loc
);
5060 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5062 * "It is an error to write to a const variable outside of
5063 * its declaration, so they must be initialized when
5066 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5067 _mesa_glsl_error(& loc
, state
,
5068 "const declaration of `%s' must be initialized",
5072 if (state
->es_shader
) {
5073 const glsl_type
*const t
= (earlier
== NULL
)
5074 ? var
->type
: earlier
->type
;
5076 if (t
->is_unsized_array())
5077 /* Section 10.17 of the GLSL ES 1.00 specification states that
5078 * unsized array declarations have been removed from the language.
5079 * Arrays that are sized using an initializer are still explicitly
5080 * sized. However, GLSL ES 1.00 does not allow array
5081 * initializers. That is only allowed in GLSL ES 3.00.
5083 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5085 * "An array type can also be formed without specifying a size
5086 * if the definition includes an initializer:
5088 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5089 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5094 _mesa_glsl_error(& loc
, state
,
5095 "unsized array declarations are not allowed in "
5099 /* If the declaration is not a redeclaration, there are a few additional
5100 * semantic checks that must be applied. In addition, variable that was
5101 * created for the declaration should be added to the IR stream.
5103 if (earlier
== NULL
) {
5104 validate_identifier(decl
->identifier
, loc
, state
);
5106 /* Add the variable to the symbol table. Note that the initializer's
5107 * IR was already processed earlier (though it hasn't been emitted
5108 * yet), without the variable in scope.
5110 * This differs from most C-like languages, but it follows the GLSL
5111 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5114 * "Within a declaration, the scope of a name starts immediately
5115 * after the initializer if present or immediately after the name
5116 * being declared if not."
5118 if (!state
->symbols
->add_variable(var
)) {
5119 YYLTYPE loc
= this->get_location();
5120 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5121 "current scope", decl
->identifier
);
5125 /* Push the variable declaration to the top. It means that all the
5126 * variable declarations will appear in a funny last-to-first order,
5127 * but otherwise we run into trouble if a function is prototyped, a
5128 * global var is decled, then the function is defined with usage of
5129 * the global var. See glslparsertest's CorrectModule.frag.
5131 instructions
->push_head(var
);
5134 instructions
->append_list(&initializer_instructions
);
5138 /* Generally, variable declarations do not have r-values. However,
5139 * one is used for the declaration in
5141 * while (bool b = some_condition()) {
5145 * so we return the rvalue from the last seen declaration here.
5152 ast_parameter_declarator::hir(exec_list
*instructions
,
5153 struct _mesa_glsl_parse_state
*state
)
5156 const struct glsl_type
*type
;
5157 const char *name
= NULL
;
5158 YYLTYPE loc
= this->get_location();
5160 type
= this->type
->glsl_type(& name
, state
);
5164 _mesa_glsl_error(& loc
, state
,
5165 "invalid type `%s' in declaration of `%s'",
5166 name
, this->identifier
);
5168 _mesa_glsl_error(& loc
, state
,
5169 "invalid type in declaration of `%s'",
5173 type
= glsl_type::error_type
;
5176 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5178 * "Functions that accept no input arguments need not use void in the
5179 * argument list because prototypes (or definitions) are required and
5180 * therefore there is no ambiguity when an empty argument list "( )" is
5181 * declared. The idiom "(void)" as a parameter list is provided for
5184 * Placing this check here prevents a void parameter being set up
5185 * for a function, which avoids tripping up checks for main taking
5186 * parameters and lookups of an unnamed symbol.
5188 if (type
->is_void()) {
5189 if (this->identifier
!= NULL
)
5190 _mesa_glsl_error(& loc
, state
,
5191 "named parameter cannot have type `void'");
5197 if (formal_parameter
&& (this->identifier
== NULL
)) {
5198 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5202 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5203 * call already handled the "vec4[..] foo" case.
5205 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5207 if (!type
->is_error() && type
->is_unsized_array()) {
5208 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5210 type
= glsl_type::error_type
;
5214 ir_variable
*var
= new(ctx
)
5215 ir_variable(type
, this->identifier
, ir_var_function_in
);
5217 /* Apply any specified qualifiers to the parameter declaration. Note that
5218 * for function parameters the default mode is 'in'.
5220 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5223 /* From section 4.1.7 of the GLSL 4.40 spec:
5225 * "Opaque variables cannot be treated as l-values; hence cannot
5226 * be used as out or inout function parameters, nor can they be
5229 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5230 && type
->contains_opaque()) {
5231 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5232 "contain opaque variables");
5233 type
= glsl_type::error_type
;
5236 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5238 * "When calling a function, expressions that do not evaluate to
5239 * l-values cannot be passed to parameters declared as out or inout."
5241 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5243 * "Other binary or unary expressions, non-dereferenced arrays,
5244 * function names, swizzles with repeated fields, and constants
5245 * cannot be l-values."
5247 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5248 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5250 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5252 && !state
->check_version(120, 100, &loc
,
5253 "arrays cannot be out or inout parameters")) {
5254 type
= glsl_type::error_type
;
5257 instructions
->push_tail(var
);
5259 /* Parameter declarations do not have r-values.
5266 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5268 exec_list
*ir_parameters
,
5269 _mesa_glsl_parse_state
*state
)
5271 ast_parameter_declarator
*void_param
= NULL
;
5274 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5275 param
->formal_parameter
= formal
;
5276 param
->hir(ir_parameters
, state
);
5284 if ((void_param
!= NULL
) && (count
> 1)) {
5285 YYLTYPE loc
= void_param
->get_location();
5287 _mesa_glsl_error(& loc
, state
,
5288 "`void' parameter must be only parameter");
5294 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5296 /* IR invariants disallow function declarations or definitions
5297 * nested within other function definitions. But there is no
5298 * requirement about the relative order of function declarations
5299 * and definitions with respect to one another. So simply insert
5300 * the new ir_function block at the end of the toplevel instruction
5303 state
->toplevel_ir
->push_tail(f
);
5308 ast_function::hir(exec_list
*instructions
,
5309 struct _mesa_glsl_parse_state
*state
)
5312 ir_function
*f
= NULL
;
5313 ir_function_signature
*sig
= NULL
;
5314 exec_list hir_parameters
;
5315 YYLTYPE loc
= this->get_location();
5317 const char *const name
= identifier
;
5319 /* New functions are always added to the top-level IR instruction stream,
5320 * so this instruction list pointer is ignored. See also emit_function
5323 (void) instructions
;
5325 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5327 * "Function declarations (prototypes) cannot occur inside of functions;
5328 * they must be at global scope, or for the built-in functions, outside
5329 * the global scope."
5331 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5333 * "User defined functions may only be defined within the global scope."
5335 * Note that this language does not appear in GLSL 1.10.
5337 if ((state
->current_function
!= NULL
) &&
5338 state
->is_version(120, 100)) {
5339 YYLTYPE loc
= this->get_location();
5340 _mesa_glsl_error(&loc
, state
,
5341 "declaration of function `%s' not allowed within "
5342 "function body", name
);
5345 validate_identifier(name
, this->get_location(), state
);
5347 /* Convert the list of function parameters to HIR now so that they can be
5348 * used below to compare this function's signature with previously seen
5349 * signatures for functions with the same name.
5351 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5353 & hir_parameters
, state
);
5355 const char *return_type_name
;
5356 const glsl_type
*return_type
=
5357 this->return_type
->glsl_type(& return_type_name
, state
);
5360 YYLTYPE loc
= this->get_location();
5361 _mesa_glsl_error(&loc
, state
,
5362 "function `%s' has undeclared return type `%s'",
5363 name
, return_type_name
);
5364 return_type
= glsl_type::error_type
;
5367 /* ARB_shader_subroutine states:
5368 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5369 * subroutine(...) to a function declaration."
5371 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5372 YYLTYPE loc
= this->get_location();
5373 _mesa_glsl_error(&loc
, state
,
5374 "function declaration `%s' cannot have subroutine prepended",
5378 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5379 * "No qualifier is allowed on the return type of a function."
5381 if (this->return_type
->has_qualifiers(state
)) {
5382 YYLTYPE loc
= this->get_location();
5383 _mesa_glsl_error(& loc
, state
,
5384 "function `%s' return type has qualifiers", name
);
5387 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5389 * "Arrays are allowed as arguments and as the return type. In both
5390 * cases, the array must be explicitly sized."
5392 if (return_type
->is_unsized_array()) {
5393 YYLTYPE loc
= this->get_location();
5394 _mesa_glsl_error(& loc
, state
,
5395 "function `%s' return type array must be explicitly "
5399 /* From section 4.1.7 of the GLSL 4.40 spec:
5401 * "[Opaque types] can only be declared as function parameters
5402 * or uniform-qualified variables."
5404 if (return_type
->contains_opaque()) {
5405 YYLTYPE loc
= this->get_location();
5406 _mesa_glsl_error(&loc
, state
,
5407 "function `%s' return type can't contain an opaque type",
5412 if (return_type
->is_subroutine()) {
5413 YYLTYPE loc
= this->get_location();
5414 _mesa_glsl_error(&loc
, state
,
5415 "function `%s' return type can't be a subroutine type",
5420 /* Create an ir_function if one doesn't already exist. */
5421 f
= state
->symbols
->get_function(name
);
5423 f
= new(ctx
) ir_function(name
);
5424 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5425 if (!state
->symbols
->add_function(f
)) {
5426 /* This function name shadows a non-function use of the same name. */
5427 YYLTYPE loc
= this->get_location();
5428 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5429 "non-function", name
);
5433 emit_function(state
, f
);
5436 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5438 * "A shader cannot redefine or overload built-in functions."
5440 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5442 * "User code can overload the built-in functions but cannot redefine
5445 if (state
->es_shader
&& state
->language_version
>= 300) {
5446 /* Local shader has no exact candidates; check the built-ins. */
5447 _mesa_glsl_initialize_builtin_functions();
5448 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5449 YYLTYPE loc
= this->get_location();
5450 _mesa_glsl_error(& loc
, state
,
5451 "A shader cannot redefine or overload built-in "
5452 "function `%s' in GLSL ES 3.00", name
);
5457 /* Verify that this function's signature either doesn't match a previously
5458 * seen signature for a function with the same name, or, if a match is found,
5459 * that the previously seen signature does not have an associated definition.
5461 if (state
->es_shader
|| f
->has_user_signature()) {
5462 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5464 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5465 if (badvar
!= NULL
) {
5466 YYLTYPE loc
= this->get_location();
5468 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5469 "qualifiers don't match prototype", name
, badvar
);
5472 if (sig
->return_type
!= return_type
) {
5473 YYLTYPE loc
= this->get_location();
5475 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5476 "match prototype", name
);
5479 if (sig
->is_defined
) {
5480 if (is_definition
) {
5481 YYLTYPE loc
= this->get_location();
5482 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5484 /* We just encountered a prototype that exactly matches a
5485 * function that's already been defined. This is redundant,
5486 * and we should ignore it.
5494 /* Verify the return type of main() */
5495 if (strcmp(name
, "main") == 0) {
5496 if (! return_type
->is_void()) {
5497 YYLTYPE loc
= this->get_location();
5499 _mesa_glsl_error(& loc
, state
, "main() must return void");
5502 if (!hir_parameters
.is_empty()) {
5503 YYLTYPE loc
= this->get_location();
5505 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5509 /* Finish storing the information about this new function in its signature.
5512 sig
= new(ctx
) ir_function_signature(return_type
);
5513 f
->add_signature(sig
);
5516 sig
->replace_parameters(&hir_parameters
);
5519 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5522 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5523 unsigned qual_index
;
5524 if (process_qualifier_constant(state
, &loc
, "index",
5525 this->return_type
->qualifier
.index
,
5527 if (!state
->has_explicit_uniform_location()) {
5528 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5529 "GL_ARB_explicit_uniform_location or "
5531 } else if (qual_index
>= MAX_SUBROUTINES
) {
5532 _mesa_glsl_error(&loc
, state
,
5533 "invalid subroutine index (%d) index must "
5534 "be a number between 0 and "
5535 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5536 MAX_SUBROUTINES
- 1);
5538 f
->subroutine_index
= qual_index
;
5543 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5544 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5545 f
->num_subroutine_types
);
5547 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5548 const struct glsl_type
*type
;
5549 /* the subroutine type must be already declared */
5550 type
= state
->symbols
->get_type(decl
->identifier
);
5552 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5555 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5556 ir_function
*fn
= state
->subroutine_types
[i
];
5557 ir_function_signature
*tsig
= NULL
;
5559 if (strcmp(fn
->name
, decl
->identifier
))
5562 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5565 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5567 if (tsig
->return_type
!= sig
->return_type
) {
5568 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5572 f
->subroutine_types
[idx
++] = type
;
5574 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5576 state
->num_subroutines
+ 1);
5577 state
->subroutines
[state
->num_subroutines
] = f
;
5578 state
->num_subroutines
++;
5582 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5583 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5584 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5587 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5589 state
->num_subroutine_types
+ 1);
5590 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5591 state
->num_subroutine_types
++;
5593 f
->is_subroutine
= true;
5596 /* Function declarations (prototypes) do not have r-values.
5603 ast_function_definition::hir(exec_list
*instructions
,
5604 struct _mesa_glsl_parse_state
*state
)
5606 prototype
->is_definition
= true;
5607 prototype
->hir(instructions
, state
);
5609 ir_function_signature
*signature
= prototype
->signature
;
5610 if (signature
== NULL
)
5613 assert(state
->current_function
== NULL
);
5614 state
->current_function
= signature
;
5615 state
->found_return
= false;
5617 /* Duplicate parameters declared in the prototype as concrete variables.
5618 * Add these to the symbol table.
5620 state
->symbols
->push_scope();
5621 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5622 assert(var
->as_variable() != NULL
);
5624 /* The only way a parameter would "exist" is if two parameters have
5627 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5628 YYLTYPE loc
= this->get_location();
5630 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5632 state
->symbols
->add_variable(var
);
5636 /* Convert the body of the function to HIR. */
5637 this->body
->hir(&signature
->body
, state
);
5638 signature
->is_defined
= true;
5640 state
->symbols
->pop_scope();
5642 assert(state
->current_function
== signature
);
5643 state
->current_function
= NULL
;
5645 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5646 YYLTYPE loc
= this->get_location();
5647 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5648 "%s, but no return statement",
5649 signature
->function_name(),
5650 signature
->return_type
->name
);
5653 /* Function definitions do not have r-values.
5660 ast_jump_statement::hir(exec_list
*instructions
,
5661 struct _mesa_glsl_parse_state
*state
)
5668 assert(state
->current_function
);
5670 if (opt_return_value
) {
5671 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5673 /* The value of the return type can be NULL if the shader says
5674 * 'return foo();' and foo() is a function that returns void.
5676 * NOTE: The GLSL spec doesn't say that this is an error. The type
5677 * of the return value is void. If the return type of the function is
5678 * also void, then this should compile without error. Seriously.
5680 const glsl_type
*const ret_type
=
5681 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5683 /* Implicit conversions are not allowed for return values prior to
5684 * ARB_shading_language_420pack.
5686 if (state
->current_function
->return_type
!= ret_type
) {
5687 YYLTYPE loc
= this->get_location();
5689 if (state
->has_420pack()) {
5690 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5692 _mesa_glsl_error(& loc
, state
,
5693 "could not implicitly convert return value "
5694 "to %s, in function `%s'",
5695 state
->current_function
->return_type
->name
,
5696 state
->current_function
->function_name());
5699 _mesa_glsl_error(& loc
, state
,
5700 "`return' with wrong type %s, in function `%s' "
5703 state
->current_function
->function_name(),
5704 state
->current_function
->return_type
->name
);
5706 } else if (state
->current_function
->return_type
->base_type
==
5708 YYLTYPE loc
= this->get_location();
5710 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5711 * specs add a clarification:
5713 * "A void function can only use return without a return argument, even if
5714 * the return argument has void type. Return statements only accept values:
5717 * void func2() { return func1(); } // illegal return statement"
5719 _mesa_glsl_error(& loc
, state
,
5720 "void functions can only use `return' without a "
5724 inst
= new(ctx
) ir_return(ret
);
5726 if (state
->current_function
->return_type
->base_type
!=
5728 YYLTYPE loc
= this->get_location();
5730 _mesa_glsl_error(& loc
, state
,
5731 "`return' with no value, in function %s returning "
5733 state
->current_function
->function_name());
5735 inst
= new(ctx
) ir_return
;
5738 state
->found_return
= true;
5739 instructions
->push_tail(inst
);
5744 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5745 YYLTYPE loc
= this->get_location();
5747 _mesa_glsl_error(& loc
, state
,
5748 "`discard' may only appear in a fragment shader");
5750 instructions
->push_tail(new(ctx
) ir_discard
);
5755 if (mode
== ast_continue
&&
5756 state
->loop_nesting_ast
== NULL
) {
5757 YYLTYPE loc
= this->get_location();
5759 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5760 } else if (mode
== ast_break
&&
5761 state
->loop_nesting_ast
== NULL
&&
5762 state
->switch_state
.switch_nesting_ast
== NULL
) {
5763 YYLTYPE loc
= this->get_location();
5765 _mesa_glsl_error(& loc
, state
,
5766 "break may only appear in a loop or a switch");
5768 /* For a loop, inline the for loop expression again, since we don't
5769 * know where near the end of the loop body the normal copy of it is
5770 * going to be placed. Same goes for the condition for a do-while
5773 if (state
->loop_nesting_ast
!= NULL
&&
5774 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5775 if (state
->loop_nesting_ast
->rest_expression
) {
5776 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5779 if (state
->loop_nesting_ast
->mode
==
5780 ast_iteration_statement::ast_do_while
) {
5781 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5785 if (state
->switch_state
.is_switch_innermost
&&
5786 mode
== ast_continue
) {
5787 /* Set 'continue_inside' to true. */
5788 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5789 ir_dereference_variable
*deref_continue_inside_var
=
5790 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5791 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5794 /* Break out from the switch, continue for the loop will
5795 * be called right after switch. */
5796 ir_loop_jump
*const jump
=
5797 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5798 instructions
->push_tail(jump
);
5800 } else if (state
->switch_state
.is_switch_innermost
&&
5801 mode
== ast_break
) {
5802 /* Force break out of switch by inserting a break. */
5803 ir_loop_jump
*const jump
=
5804 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5805 instructions
->push_tail(jump
);
5807 ir_loop_jump
*const jump
=
5808 new(ctx
) ir_loop_jump((mode
== ast_break
)
5809 ? ir_loop_jump::jump_break
5810 : ir_loop_jump::jump_continue
);
5811 instructions
->push_tail(jump
);
5818 /* Jump instructions do not have r-values.
5825 ast_selection_statement::hir(exec_list
*instructions
,
5826 struct _mesa_glsl_parse_state
*state
)
5830 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5832 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5834 * "Any expression whose type evaluates to a Boolean can be used as the
5835 * conditional expression bool-expression. Vector types are not accepted
5836 * as the expression to if."
5838 * The checks are separated so that higher quality diagnostics can be
5839 * generated for cases where both rules are violated.
5841 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5842 YYLTYPE loc
= this->condition
->get_location();
5844 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5848 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5850 if (then_statement
!= NULL
) {
5851 state
->symbols
->push_scope();
5852 then_statement
->hir(& stmt
->then_instructions
, state
);
5853 state
->symbols
->pop_scope();
5856 if (else_statement
!= NULL
) {
5857 state
->symbols
->push_scope();
5858 else_statement
->hir(& stmt
->else_instructions
, state
);
5859 state
->symbols
->pop_scope();
5862 instructions
->push_tail(stmt
);
5864 /* if-statements do not have r-values.
5871 ast_switch_statement::hir(exec_list
*instructions
,
5872 struct _mesa_glsl_parse_state
*state
)
5876 ir_rvalue
*const test_expression
=
5877 this->test_expression
->hir(instructions
, state
);
5879 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5881 * "The type of init-expression in a switch statement must be a
5884 if (!test_expression
->type
->is_scalar() ||
5885 !test_expression
->type
->is_integer()) {
5886 YYLTYPE loc
= this->test_expression
->get_location();
5888 _mesa_glsl_error(& loc
,
5890 "switch-statement expression must be scalar "
5894 /* Track the switch-statement nesting in a stack-like manner.
5896 struct glsl_switch_state saved
= state
->switch_state
;
5898 state
->switch_state
.is_switch_innermost
= true;
5899 state
->switch_state
.switch_nesting_ast
= this;
5900 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5901 hash_table_pointer_compare
);
5902 state
->switch_state
.previous_default
= NULL
;
5904 /* Initalize is_fallthru state to false.
5906 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5907 state
->switch_state
.is_fallthru_var
=
5908 new(ctx
) ir_variable(glsl_type::bool_type
,
5909 "switch_is_fallthru_tmp",
5911 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5913 ir_dereference_variable
*deref_is_fallthru_var
=
5914 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5915 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5918 /* Initialize continue_inside state to false.
5920 state
->switch_state
.continue_inside
=
5921 new(ctx
) ir_variable(glsl_type::bool_type
,
5922 "continue_inside_tmp",
5924 instructions
->push_tail(state
->switch_state
.continue_inside
);
5926 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5927 ir_dereference_variable
*deref_continue_inside_var
=
5928 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5929 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5932 state
->switch_state
.run_default
=
5933 new(ctx
) ir_variable(glsl_type::bool_type
,
5936 instructions
->push_tail(state
->switch_state
.run_default
);
5938 /* Loop around the switch is used for flow control. */
5939 ir_loop
* loop
= new(ctx
) ir_loop();
5940 instructions
->push_tail(loop
);
5942 /* Cache test expression.
5944 test_to_hir(&loop
->body_instructions
, state
);
5946 /* Emit code for body of switch stmt.
5948 body
->hir(&loop
->body_instructions
, state
);
5950 /* Insert a break at the end to exit loop. */
5951 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5952 loop
->body_instructions
.push_tail(jump
);
5954 /* If we are inside loop, check if continue got called inside switch. */
5955 if (state
->loop_nesting_ast
!= NULL
) {
5956 ir_dereference_variable
*deref_continue_inside
=
5957 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5958 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5959 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5961 if (state
->loop_nesting_ast
!= NULL
) {
5962 if (state
->loop_nesting_ast
->rest_expression
) {
5963 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5966 if (state
->loop_nesting_ast
->mode
==
5967 ast_iteration_statement::ast_do_while
) {
5968 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5971 irif
->then_instructions
.push_tail(jump
);
5972 instructions
->push_tail(irif
);
5975 hash_table_dtor(state
->switch_state
.labels_ht
);
5977 state
->switch_state
= saved
;
5979 /* Switch statements do not have r-values. */
5985 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5986 struct _mesa_glsl_parse_state
*state
)
5990 /* set to true to avoid a duplicate "use of uninitialized variable" warning
5991 * on the switch test case. The first one would be already raised when
5992 * getting the test_expression at ast_switch_statement::hir
5994 test_expression
->set_is_lhs(true);
5995 /* Cache value of test expression. */
5996 ir_rvalue
*const test_val
=
5997 test_expression
->hir(instructions
,
6000 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6003 ir_dereference_variable
*deref_test_var
=
6004 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6006 instructions
->push_tail(state
->switch_state
.test_var
);
6007 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6012 ast_switch_body::hir(exec_list
*instructions
,
6013 struct _mesa_glsl_parse_state
*state
)
6016 stmts
->hir(instructions
, state
);
6018 /* Switch bodies do not have r-values. */
6023 ast_case_statement_list::hir(exec_list
*instructions
,
6024 struct _mesa_glsl_parse_state
*state
)
6026 exec_list default_case
, after_default
, tmp
;
6028 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6029 case_stmt
->hir(&tmp
, state
);
6032 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6033 default_case
.append_list(&tmp
);
6037 /* If default case found, append 'after_default' list. */
6038 if (!default_case
.is_empty())
6039 after_default
.append_list(&tmp
);
6041 instructions
->append_list(&tmp
);
6044 /* Handle the default case. This is done here because default might not be
6045 * the last case. We need to add checks against following cases first to see
6046 * if default should be chosen or not.
6048 if (!default_case
.is_empty()) {
6050 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6051 ir_dereference_variable
*deref_run_default_var
=
6052 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6054 /* Choose to run default case initially, following conditional
6055 * assignments might change this.
6057 ir_assignment
*const init_var
=
6058 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6059 instructions
->push_tail(init_var
);
6061 /* Default case was the last one, no checks required. */
6062 if (after_default
.is_empty()) {
6063 instructions
->append_list(&default_case
);
6067 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6068 ir_assignment
*assign
= ir
->as_assignment();
6073 /* Clone the check between case label and init expression. */
6074 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6075 ir_expression
*clone
= exp
->clone(state
, NULL
);
6077 ir_dereference_variable
*deref_var
=
6078 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6079 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6081 ir_assignment
*const set_false
=
6082 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6084 instructions
->push_tail(set_false
);
6087 /* Append default case and all cases after it. */
6088 instructions
->append_list(&default_case
);
6089 instructions
->append_list(&after_default
);
6092 /* Case statements do not have r-values. */
6097 ast_case_statement::hir(exec_list
*instructions
,
6098 struct _mesa_glsl_parse_state
*state
)
6100 labels
->hir(instructions
, state
);
6102 /* Guard case statements depending on fallthru state. */
6103 ir_dereference_variable
*const deref_fallthru_guard
=
6104 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6105 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6107 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6108 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6110 instructions
->push_tail(test_fallthru
);
6112 /* Case statements do not have r-values. */
6118 ast_case_label_list::hir(exec_list
*instructions
,
6119 struct _mesa_glsl_parse_state
*state
)
6121 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6122 label
->hir(instructions
, state
);
6124 /* Case labels do not have r-values. */
6129 ast_case_label::hir(exec_list
*instructions
,
6130 struct _mesa_glsl_parse_state
*state
)
6134 ir_dereference_variable
*deref_fallthru_var
=
6135 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6137 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6139 /* If not default case, ... */
6140 if (this->test_value
!= NULL
) {
6141 /* Conditionally set fallthru state based on
6142 * comparison of cached test expression value to case label.
6144 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6145 ir_constant
*label_const
= label_rval
->constant_expression_value();
6148 YYLTYPE loc
= this->test_value
->get_location();
6150 _mesa_glsl_error(& loc
, state
,
6151 "switch statement case label must be a "
6152 "constant expression");
6154 /* Stuff a dummy value in to allow processing to continue. */
6155 label_const
= new(ctx
) ir_constant(0);
6157 ast_expression
*previous_label
= (ast_expression
*)
6158 hash_table_find(state
->switch_state
.labels_ht
,
6159 (void *)(uintptr_t)label_const
->value
.u
[0]);
6161 if (previous_label
) {
6162 YYLTYPE loc
= this->test_value
->get_location();
6163 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6165 loc
= previous_label
->get_location();
6166 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6168 hash_table_insert(state
->switch_state
.labels_ht
,
6170 (void *)(uintptr_t)label_const
->value
.u
[0]);
6174 ir_dereference_variable
*deref_test_var
=
6175 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6177 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6182 * From GLSL 4.40 specification section 6.2 ("Selection"):
6184 * "The type of the init-expression value in a switch statement must
6185 * be a scalar int or uint. The type of the constant-expression value
6186 * in a case label also must be a scalar int or uint. When any pair
6187 * of these values is tested for "equal value" and the types do not
6188 * match, an implicit conversion will be done to convert the int to a
6189 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6192 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6193 YYLTYPE loc
= this->test_value
->get_location();
6195 const glsl_type
*type_a
= label_const
->type
;
6196 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6198 /* Check if int->uint implicit conversion is supported. */
6199 bool integer_conversion_supported
=
6200 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6203 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6204 !integer_conversion_supported
) {
6205 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6206 "init-expression and case label (%s != %s)",
6207 type_a
->name
, type_b
->name
);
6209 /* Conversion of the case label. */
6210 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6211 if (!apply_implicit_conversion(glsl_type::uint_type
,
6212 test_cond
->operands
[0], state
))
6213 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6215 /* Conversion of the init-expression value. */
6216 if (!apply_implicit_conversion(glsl_type::uint_type
,
6217 test_cond
->operands
[1], state
))
6218 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6223 ir_assignment
*set_fallthru_on_test
=
6224 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6226 instructions
->push_tail(set_fallthru_on_test
);
6227 } else { /* default case */
6228 if (state
->switch_state
.previous_default
) {
6229 YYLTYPE loc
= this->get_location();
6230 _mesa_glsl_error(& loc
, state
,
6231 "multiple default labels in one switch");
6233 loc
= state
->switch_state
.previous_default
->get_location();
6234 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6236 state
->switch_state
.previous_default
= this;
6238 /* Set fallthru condition on 'run_default' bool. */
6239 ir_dereference_variable
*deref_run_default
=
6240 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6241 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6242 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6246 /* Set falltrhu state. */
6247 ir_assignment
*set_fallthru
=
6248 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6250 instructions
->push_tail(set_fallthru
);
6253 /* Case statements do not have r-values. */
6258 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6259 struct _mesa_glsl_parse_state
*state
)
6263 if (condition
!= NULL
) {
6264 ir_rvalue
*const cond
=
6265 condition
->hir(instructions
, state
);
6268 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6269 YYLTYPE loc
= condition
->get_location();
6271 _mesa_glsl_error(& loc
, state
,
6272 "loop condition must be scalar boolean");
6274 /* As the first code in the loop body, generate a block that looks
6275 * like 'if (!condition) break;' as the loop termination condition.
6277 ir_rvalue
*const not_cond
=
6278 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6280 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6282 ir_jump
*const break_stmt
=
6283 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6285 if_stmt
->then_instructions
.push_tail(break_stmt
);
6286 instructions
->push_tail(if_stmt
);
6293 ast_iteration_statement::hir(exec_list
*instructions
,
6294 struct _mesa_glsl_parse_state
*state
)
6298 /* For-loops and while-loops start a new scope, but do-while loops do not.
6300 if (mode
!= ast_do_while
)
6301 state
->symbols
->push_scope();
6303 if (init_statement
!= NULL
)
6304 init_statement
->hir(instructions
, state
);
6306 ir_loop
*const stmt
= new(ctx
) ir_loop();
6307 instructions
->push_tail(stmt
);
6309 /* Track the current loop nesting. */
6310 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6312 state
->loop_nesting_ast
= this;
6314 /* Likewise, indicate that following code is closest to a loop,
6315 * NOT closest to a switch.
6317 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6318 state
->switch_state
.is_switch_innermost
= false;
6320 if (mode
!= ast_do_while
)
6321 condition_to_hir(&stmt
->body_instructions
, state
);
6324 body
->hir(& stmt
->body_instructions
, state
);
6326 if (rest_expression
!= NULL
)
6327 rest_expression
->hir(& stmt
->body_instructions
, state
);
6329 if (mode
== ast_do_while
)
6330 condition_to_hir(&stmt
->body_instructions
, state
);
6332 if (mode
!= ast_do_while
)
6333 state
->symbols
->pop_scope();
6335 /* Restore previous nesting before returning. */
6336 state
->loop_nesting_ast
= nesting_ast
;
6337 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6339 /* Loops do not have r-values.
6346 * Determine if the given type is valid for establishing a default precision
6349 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6351 * "The precision statement
6353 * precision precision-qualifier type;
6355 * can be used to establish a default precision qualifier. The type field
6356 * can be either int or float or any of the sampler types, and the
6357 * precision-qualifier can be lowp, mediump, or highp."
6359 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6360 * qualifiers on sampler types, but this seems like an oversight (since the
6361 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6362 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6366 is_valid_default_precision_type(const struct glsl_type
*const type
)
6371 switch (type
->base_type
) {
6373 case GLSL_TYPE_FLOAT
:
6374 /* "int" and "float" are valid, but vectors and matrices are not. */
6375 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6376 case GLSL_TYPE_SAMPLER
:
6377 case GLSL_TYPE_IMAGE
:
6378 case GLSL_TYPE_ATOMIC_UINT
:
6387 ast_type_specifier::hir(exec_list
*instructions
,
6388 struct _mesa_glsl_parse_state
*state
)
6390 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6393 YYLTYPE loc
= this->get_location();
6395 /* If this is a precision statement, check that the type to which it is
6396 * applied is either float or int.
6398 * From section 4.5.3 of the GLSL 1.30 spec:
6399 * "The precision statement
6400 * precision precision-qualifier type;
6401 * can be used to establish a default precision qualifier. The type
6402 * field can be either int or float [...]. Any other types or
6403 * qualifiers will result in an error.
6405 if (this->default_precision
!= ast_precision_none
) {
6406 if (!state
->check_precision_qualifiers_allowed(&loc
))
6409 if (this->structure
!= NULL
) {
6410 _mesa_glsl_error(&loc
, state
,
6411 "precision qualifiers do not apply to structures");
6415 if (this->array_specifier
!= NULL
) {
6416 _mesa_glsl_error(&loc
, state
,
6417 "default precision statements do not apply to "
6422 const struct glsl_type
*const type
=
6423 state
->symbols
->get_type(this->type_name
);
6424 if (!is_valid_default_precision_type(type
)) {
6425 _mesa_glsl_error(&loc
, state
,
6426 "default precision statements apply only to "
6427 "float, int, and opaque types");
6431 if (state
->es_shader
) {
6432 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6435 * "Non-precision qualified declarations will use the precision
6436 * qualifier specified in the most recent precision statement
6437 * that is still in scope. The precision statement has the same
6438 * scoping rules as variable declarations. If it is declared
6439 * inside a compound statement, its effect stops at the end of
6440 * the innermost statement it was declared in. Precision
6441 * statements in nested scopes override precision statements in
6442 * outer scopes. Multiple precision statements for the same basic
6443 * type can appear inside the same scope, with later statements
6444 * overriding earlier statements within that scope."
6446 * Default precision specifications follow the same scope rules as
6447 * variables. So, we can track the state of the default precision
6448 * qualifiers in the symbol table, and the rules will just work. This
6449 * is a slight abuse of the symbol table, but it has the semantics
6452 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6453 this->default_precision
);
6456 /* FINISHME: Translate precision statements into IR. */
6460 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6461 * process_record_constructor() can do type-checking on C-style initializer
6462 * expressions of structs, but ast_struct_specifier should only be translated
6463 * to HIR if it is declaring the type of a structure.
6465 * The ->is_declaration field is false for initializers of variables
6466 * declared separately from the struct's type definition.
6468 * struct S { ... }; (is_declaration = true)
6469 * struct T { ... } t = { ... }; (is_declaration = true)
6470 * S s = { ... }; (is_declaration = false)
6472 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6473 return this->structure
->hir(instructions
, state
);
6480 * Process a structure or interface block tree into an array of structure fields
6482 * After parsing, where there are some syntax differnces, structures and
6483 * interface blocks are almost identical. They are similar enough that the
6484 * AST for each can be processed the same way into a set of
6485 * \c glsl_struct_field to describe the members.
6487 * If we're processing an interface block, var_mode should be the type of the
6488 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6489 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6493 * The number of fields processed. A pointer to the array structure fields is
6494 * stored in \c *fields_ret.
6497 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6498 struct _mesa_glsl_parse_state
*state
,
6499 exec_list
*declarations
,
6500 glsl_struct_field
**fields_ret
,
6502 enum glsl_matrix_layout matrix_layout
,
6503 bool allow_reserved_names
,
6504 ir_variable_mode var_mode
,
6505 ast_type_qualifier
*layout
,
6506 unsigned block_stream
,
6507 unsigned block_xfb_buffer
,
6508 unsigned block_xfb_offset
,
6509 unsigned expl_location
,
6510 unsigned expl_align
)
6512 unsigned decl_count
= 0;
6513 unsigned next_offset
= 0;
6515 /* Make an initial pass over the list of fields to determine how
6516 * many there are. Each element in this list is an ast_declarator_list.
6517 * This means that we actually need to count the number of elements in the
6518 * 'declarations' list in each of the elements.
6520 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6521 decl_count
+= decl_list
->declarations
.length();
6524 /* Allocate storage for the fields and process the field
6525 * declarations. As the declarations are processed, try to also convert
6526 * the types to HIR. This ensures that structure definitions embedded in
6527 * other structure definitions or in interface blocks are processed.
6529 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6532 bool first_member
= true;
6533 bool first_member_has_explicit_location
= false;
6536 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6537 const char *type_name
;
6538 YYLTYPE loc
= decl_list
->get_location();
6540 decl_list
->type
->specifier
->hir(instructions
, state
);
6542 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6544 * "Anonymous structures are not supported; so embedded structures
6545 * must have a declarator. A name given to an embedded struct is
6546 * scoped at the same level as the struct it is embedded in."
6548 * The same section of the GLSL 1.20 spec says:
6550 * "Anonymous structures are not supported. Embedded structures are
6553 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6554 * embedded structures in 1.10 only.
6556 if (state
->language_version
!= 110 &&
6557 decl_list
->type
->specifier
->structure
!= NULL
)
6558 _mesa_glsl_error(&loc
, state
,
6559 "embedded structure declarations are not allowed");
6561 const glsl_type
*decl_type
=
6562 decl_list
->type
->glsl_type(& type_name
, state
);
6564 const struct ast_type_qualifier
*const qual
=
6565 &decl_list
->type
->qualifier
;
6567 /* From section 4.3.9 of the GLSL 4.40 spec:
6569 * "[In interface blocks] opaque types are not allowed."
6571 * It should be impossible for decl_type to be NULL here. Cases that
6572 * might naturally lead to decl_type being NULL, especially for the
6573 * is_interface case, will have resulted in compilation having
6574 * already halted due to a syntax error.
6579 if (decl_type
->contains_opaque()) {
6580 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6581 "interface block contains opaque variable");
6584 if (decl_type
->contains_atomic()) {
6585 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6587 * "Members of structures cannot be declared as atomic counter
6590 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6593 if (decl_type
->contains_image()) {
6594 /* FINISHME: Same problem as with atomic counters.
6595 * FINISHME: Request clarification from Khronos and add
6596 * FINISHME: spec quotation here.
6598 _mesa_glsl_error(&loc
, state
, "image in structure");
6602 if (qual
->flags
.q
.explicit_binding
) {
6603 _mesa_glsl_error(&loc
, state
,
6604 "binding layout qualifier cannot be applied "
6605 "to struct or interface block members");
6609 if (!first_member
) {
6610 if (!layout
->flags
.q
.explicit_location
&&
6611 ((first_member_has_explicit_location
&&
6612 !qual
->flags
.q
.explicit_location
) ||
6613 (!first_member_has_explicit_location
&&
6614 qual
->flags
.q
.explicit_location
))) {
6615 _mesa_glsl_error(&loc
, state
,
6616 "when block-level location layout qualifier "
6617 "is not supplied either all members must "
6618 "have a location layout qualifier or all "
6619 "members must not have a location layout "
6623 first_member
= false;
6624 first_member_has_explicit_location
=
6625 qual
->flags
.q
.explicit_location
;
6629 if (qual
->flags
.q
.std140
||
6630 qual
->flags
.q
.std430
||
6631 qual
->flags
.q
.packed
||
6632 qual
->flags
.q
.shared
) {
6633 _mesa_glsl_error(&loc
, state
,
6634 "uniform/shader storage block layout qualifiers "
6635 "std140, std430, packed, and shared can only be "
6636 "applied to uniform/shader storage blocks, not "
6640 if (qual
->flags
.q
.constant
) {
6641 _mesa_glsl_error(&loc
, state
,
6642 "const storage qualifier cannot be applied "
6643 "to struct or interface block members");
6646 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6648 * "A block member may be declared with a stream identifier, but
6649 * the specified stream must match the stream associated with the
6650 * containing block."
6652 if (qual
->flags
.q
.explicit_stream
) {
6653 unsigned qual_stream
;
6654 if (process_qualifier_constant(state
, &loc
, "stream",
6655 qual
->stream
, &qual_stream
) &&
6656 qual_stream
!= block_stream
) {
6657 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6658 "interface block member does not match "
6659 "the interface block (%u vs %u)", qual_stream
,
6665 unsigned explicit_xfb_buffer
= 0;
6666 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6667 unsigned qual_xfb_buffer
;
6668 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6669 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6670 explicit_xfb_buffer
= 1;
6671 if (qual_xfb_buffer
!= block_xfb_buffer
)
6672 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6673 "interface block member does not match "
6674 "the interface block (%u vs %u)",
6675 qual_xfb_buffer
, block_xfb_buffer
);
6677 xfb_buffer
= (int) qual_xfb_buffer
;
6680 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
6681 xfb_buffer
= (int) block_xfb_buffer
;
6684 int xfb_stride
= -1;
6685 if (qual
->flags
.q
.explicit_xfb_stride
) {
6686 unsigned qual_xfb_stride
;
6687 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6688 qual
->xfb_stride
, &qual_xfb_stride
)) {
6689 xfb_stride
= (int) qual_xfb_stride
;
6693 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6694 _mesa_glsl_error(&loc
, state
,
6695 "interpolation qualifiers cannot be used "
6696 "with uniform interface blocks");
6699 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6700 qual
->has_auxiliary_storage()) {
6701 _mesa_glsl_error(&loc
, state
,
6702 "auxiliary storage qualifiers cannot be used "
6703 "in uniform blocks or structures.");
6706 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6707 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6708 _mesa_glsl_error(&loc
, state
,
6709 "row_major and column_major can only be "
6710 "applied to interface blocks");
6712 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6715 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6716 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6717 "readonly and writeonly.");
6720 foreach_list_typed (ast_declaration
, decl
, link
,
6721 &decl_list
->declarations
) {
6722 YYLTYPE loc
= decl
->get_location();
6724 if (!allow_reserved_names
)
6725 validate_identifier(decl
->identifier
, loc
, state
);
6727 const struct glsl_type
*field_type
=
6728 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6729 validate_array_dimensions(field_type
, state
, &loc
);
6730 fields
[i
].type
= field_type
;
6731 fields
[i
].name
= decl
->identifier
;
6732 fields
[i
].interpolation
=
6733 interpret_interpolation_qualifier(qual
, field_type
,
6734 var_mode
, state
, &loc
);
6735 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6736 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6737 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6738 fields
[i
].precision
= qual
->precision
;
6739 fields
[i
].offset
= -1;
6740 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6741 fields
[i
].xfb_buffer
= xfb_buffer
;
6742 fields
[i
].xfb_stride
= xfb_stride
;
6744 if (qual
->flags
.q
.explicit_location
) {
6745 unsigned qual_location
;
6746 if (process_qualifier_constant(state
, &loc
, "location",
6747 qual
->location
, &qual_location
)) {
6748 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6749 expl_location
= fields
[i
].location
+
6750 fields
[i
].type
->count_attribute_slots(false);
6753 if (layout
&& layout
->flags
.q
.explicit_location
) {
6754 fields
[i
].location
= expl_location
;
6755 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6757 fields
[i
].location
= -1;
6761 /* Offset can only be used with std430 and std140 layouts an initial
6762 * value of 0 is used for error detection.
6768 if (qual
->flags
.q
.row_major
||
6769 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6775 if(layout
->flags
.q
.std140
) {
6776 align
= field_type
->std140_base_alignment(row_major
);
6777 size
= field_type
->std140_size(row_major
);
6778 } else if (layout
->flags
.q
.std430
) {
6779 align
= field_type
->std430_base_alignment(row_major
);
6780 size
= field_type
->std430_size(row_major
);
6784 if (qual
->flags
.q
.explicit_offset
) {
6785 unsigned qual_offset
;
6786 if (process_qualifier_constant(state
, &loc
, "offset",
6787 qual
->offset
, &qual_offset
)) {
6788 if (align
!= 0 && size
!= 0) {
6789 if (next_offset
> qual_offset
)
6790 _mesa_glsl_error(&loc
, state
, "layout qualifier "
6791 "offset overlaps previous member");
6793 if (qual_offset
% align
) {
6794 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
6795 "must be a multiple of the base "
6796 "alignment of %s", field_type
->name
);
6798 fields
[i
].offset
= qual_offset
;
6799 next_offset
= glsl_align(qual_offset
+ size
, align
);
6801 _mesa_glsl_error(&loc
, state
, "offset can only be used "
6802 "with std430 and std140 layouts");
6807 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
6808 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
6810 if (align
== 0 || size
== 0) {
6811 _mesa_glsl_error(&loc
, state
, "align can only be used with "
6812 "std430 and std140 layouts");
6813 } else if (qual
->flags
.q
.explicit_align
) {
6814 unsigned member_align
;
6815 if (process_qualifier_constant(state
, &loc
, "align",
6816 qual
->align
, &member_align
)) {
6817 if (member_align
== 0 ||
6818 member_align
& (member_align
- 1)) {
6819 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
6820 "in not a power of 2");
6822 fields
[i
].offset
= glsl_align(offset
, member_align
);
6823 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6827 fields
[i
].offset
= glsl_align(offset
, expl_align
);
6828 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
6830 } else if (!qual
->flags
.q
.explicit_offset
) {
6831 if (align
!= 0 && size
!= 0)
6832 next_offset
= glsl_align(next_offset
+ size
, align
);
6835 /* From the ARB_enhanced_layouts spec:
6837 * "The given offset applies to the first component of the first
6838 * member of the qualified entity. Then, within the qualified
6839 * entity, subsequent components are each assigned, in order, to
6840 * the next available offset aligned to a multiple of that
6841 * component's size. Aggregate types are flattened down to the
6842 * component level to get this sequence of components."
6844 if (qual
->flags
.q
.explicit_xfb_offset
) {
6845 unsigned xfb_offset
;
6846 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
6847 qual
->offset
, &xfb_offset
)) {
6848 fields
[i
].offset
= xfb_offset
;
6849 block_xfb_offset
= fields
[i
].offset
+
6850 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6853 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
6854 unsigned align
= field_type
->is_64bit() ? 8 : 4;
6855 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
6857 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
6861 /* Propogate row- / column-major information down the fields of the
6862 * structure or interface block. Structures need this data because
6863 * the structure may contain a structure that contains ... a matrix
6864 * that need the proper layout.
6866 if (is_interface
&& layout
&&
6867 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
6868 (field_type
->without_array()->is_matrix()
6869 || field_type
->without_array()->is_record())) {
6870 /* If no layout is specified for the field, inherit the layout
6873 fields
[i
].matrix_layout
= matrix_layout
;
6875 if (qual
->flags
.q
.row_major
)
6876 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6877 else if (qual
->flags
.q
.column_major
)
6878 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6880 /* If we're processing an uniform or buffer block, the matrix
6881 * layout must be decided by this point.
6883 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6884 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6887 /* Image qualifiers are allowed on buffer variables, which can only
6888 * be defined inside shader storage buffer objects
6890 if (layout
&& var_mode
== ir_var_shader_storage
) {
6891 /* For readonly and writeonly qualifiers the field definition,
6892 * if set, overwrites the layout qualifier.
6894 if (qual
->flags
.q
.read_only
) {
6895 fields
[i
].image_read_only
= true;
6896 fields
[i
].image_write_only
= false;
6897 } else if (qual
->flags
.q
.write_only
) {
6898 fields
[i
].image_read_only
= false;
6899 fields
[i
].image_write_only
= true;
6901 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6902 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6905 /* For other qualifiers, we set the flag if either the layout
6906 * qualifier or the field qualifier are set
6908 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6909 layout
->flags
.q
.coherent
;
6910 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6911 layout
->flags
.q
._volatile
;
6912 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6913 layout
->flags
.q
.restrict_flag
;
6920 assert(i
== decl_count
);
6922 *fields_ret
= fields
;
6928 ast_struct_specifier::hir(exec_list
*instructions
,
6929 struct _mesa_glsl_parse_state
*state
)
6931 YYLTYPE loc
= this->get_location();
6933 unsigned expl_location
= 0;
6934 if (layout
&& layout
->flags
.q
.explicit_location
) {
6935 if (!process_qualifier_constant(state
, &loc
, "location",
6936 layout
->location
, &expl_location
)) {
6939 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6943 glsl_struct_field
*fields
;
6944 unsigned decl_count
=
6945 ast_process_struct_or_iface_block_members(instructions
,
6947 &this->declarations
,
6950 GLSL_MATRIX_LAYOUT_INHERITED
,
6951 false /* allow_reserved_names */,
6954 0, /* for interface only */
6955 0, /* for interface only */
6956 0, /* for interface only */
6958 0 /* for interface only */);
6960 validate_identifier(this->name
, loc
, state
);
6962 const glsl_type
*t
=
6963 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6965 if (!state
->symbols
->add_type(name
, t
)) {
6966 const glsl_type
*match
= state
->symbols
->get_type(name
);
6967 /* allow struct matching for desktop GL - older UE4 does this */
6968 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
6969 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
6971 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6973 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6975 state
->num_user_structures
+ 1);
6977 s
[state
->num_user_structures
] = t
;
6978 state
->user_structures
= s
;
6979 state
->num_user_structures
++;
6983 /* Structure type definitions do not have r-values.
6990 * Visitor class which detects whether a given interface block has been used.
6992 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6995 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6996 : mode(mode
), block(block
), found(false)
7000 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7002 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7006 return visit_continue
;
7009 bool usage_found() const
7015 ir_variable_mode mode
;
7016 const glsl_type
*block
;
7021 is_unsized_array_last_element(ir_variable
*v
)
7023 const glsl_type
*interface_type
= v
->get_interface_type();
7024 int length
= interface_type
->length
;
7026 assert(v
->type
->is_unsized_array());
7028 /* Check if it is the last element of the interface */
7029 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7035 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7037 var
->data
.image_read_only
= field
.image_read_only
;
7038 var
->data
.image_write_only
= field
.image_write_only
;
7039 var
->data
.image_coherent
= field
.image_coherent
;
7040 var
->data
.image_volatile
= field
.image_volatile
;
7041 var
->data
.image_restrict
= field
.image_restrict
;
7045 ast_interface_block::hir(exec_list
*instructions
,
7046 struct _mesa_glsl_parse_state
*state
)
7048 YYLTYPE loc
= this->get_location();
7050 /* Interface blocks must be declared at global scope */
7051 if (state
->current_function
!= NULL
) {
7052 _mesa_glsl_error(&loc
, state
,
7053 "Interface block `%s' must be declared "
7058 if (!this->layout
.flags
.q
.buffer
&&
7059 this->layout
.flags
.q
.std430
) {
7060 _mesa_glsl_error(&loc
, state
,
7061 "std430 storage block layout qualifier is supported "
7062 "only for shader storage blocks");
7065 /* The ast_interface_block has a list of ast_declarator_lists. We
7066 * need to turn those into ir_variables with an association
7067 * with this uniform block.
7069 enum glsl_interface_packing packing
;
7070 if (this->layout
.flags
.q
.shared
) {
7071 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7072 } else if (this->layout
.flags
.q
.packed
) {
7073 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7074 } else if (this->layout
.flags
.q
.std430
) {
7075 packing
= GLSL_INTERFACE_PACKING_STD430
;
7077 /* The default layout is std140.
7079 packing
= GLSL_INTERFACE_PACKING_STD140
;
7082 ir_variable_mode var_mode
;
7083 const char *iface_type_name
;
7084 if (this->layout
.flags
.q
.in
) {
7085 var_mode
= ir_var_shader_in
;
7086 iface_type_name
= "in";
7087 } else if (this->layout
.flags
.q
.out
) {
7088 var_mode
= ir_var_shader_out
;
7089 iface_type_name
= "out";
7090 } else if (this->layout
.flags
.q
.uniform
) {
7091 var_mode
= ir_var_uniform
;
7092 iface_type_name
= "uniform";
7093 } else if (this->layout
.flags
.q
.buffer
) {
7094 var_mode
= ir_var_shader_storage
;
7095 iface_type_name
= "buffer";
7097 var_mode
= ir_var_auto
;
7098 iface_type_name
= "UNKNOWN";
7099 assert(!"interface block layout qualifier not found!");
7102 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7103 if (this->layout
.flags
.q
.row_major
)
7104 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7105 else if (this->layout
.flags
.q
.column_major
)
7106 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7108 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7109 exec_list declared_variables
;
7110 glsl_struct_field
*fields
;
7112 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7113 * that we don't have incompatible qualifiers
7115 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7116 _mesa_glsl_error(&loc
, state
,
7117 "Interface block sets both readonly and writeonly");
7120 if (this->layout
.flags
.q
.explicit_component
) {
7121 _mesa_glsl_error(&loc
, state
, "component layout qualifier cannot be "
7122 "applied to a matrix, a structure, a block, or an "
7123 "array containing any of these.");
7126 unsigned qual_stream
;
7127 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7129 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7130 /* If the stream qualifier is invalid it doesn't make sense to continue
7131 * on and try to compare stream layouts on member variables against it
7132 * so just return early.
7137 unsigned qual_xfb_buffer
;
7138 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7139 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7140 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7144 unsigned qual_xfb_offset
;
7145 if (layout
.flags
.q
.explicit_xfb_offset
) {
7146 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7147 layout
.offset
, &qual_xfb_offset
)) {
7152 unsigned qual_xfb_stride
;
7153 if (layout
.flags
.q
.explicit_xfb_stride
) {
7154 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7155 layout
.xfb_stride
, &qual_xfb_stride
)) {
7160 unsigned expl_location
= 0;
7161 if (layout
.flags
.q
.explicit_location
) {
7162 if (!process_qualifier_constant(state
, &loc
, "location",
7163 layout
.location
, &expl_location
)) {
7166 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7170 unsigned expl_align
= 0;
7171 if (layout
.flags
.q
.explicit_align
) {
7172 if (!process_qualifier_constant(state
, &loc
, "align",
7173 layout
.align
, &expl_align
)) {
7176 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7177 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
7184 unsigned int num_variables
=
7185 ast_process_struct_or_iface_block_members(&declared_variables
,
7187 &this->declarations
,
7191 redeclaring_per_vertex
,
7200 if (!redeclaring_per_vertex
) {
7201 validate_identifier(this->block_name
, loc
, state
);
7203 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7205 * "Block names have no other use within a shader beyond interface
7206 * matching; it is a compile-time error to use a block name at global
7207 * scope for anything other than as a block name."
7209 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7210 if (var
&& !var
->type
->is_interface()) {
7211 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7212 "already used in the scope.",
7217 const glsl_type
*earlier_per_vertex
= NULL
;
7218 if (redeclaring_per_vertex
) {
7219 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7220 * the named interface block gl_in, we can find it by looking at the
7221 * previous declaration of gl_in. Otherwise we can find it by looking
7222 * at the previous decalartion of any of the built-in outputs,
7225 * Also check that the instance name and array-ness of the redeclaration
7229 case ir_var_shader_in
:
7230 if (ir_variable
*earlier_gl_in
=
7231 state
->symbols
->get_variable("gl_in")) {
7232 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7234 _mesa_glsl_error(&loc
, state
,
7235 "redeclaration of gl_PerVertex input not allowed "
7237 _mesa_shader_stage_to_string(state
->stage
));
7239 if (this->instance_name
== NULL
||
7240 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7241 !this->array_specifier
->is_single_dimension()) {
7242 _mesa_glsl_error(&loc
, state
,
7243 "gl_PerVertex input must be redeclared as "
7247 case ir_var_shader_out
:
7248 if (ir_variable
*earlier_gl_Position
=
7249 state
->symbols
->get_variable("gl_Position")) {
7250 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7251 } else if (ir_variable
*earlier_gl_out
=
7252 state
->symbols
->get_variable("gl_out")) {
7253 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7255 _mesa_glsl_error(&loc
, state
,
7256 "redeclaration of gl_PerVertex output not "
7257 "allowed in the %s shader",
7258 _mesa_shader_stage_to_string(state
->stage
));
7260 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7261 if (this->instance_name
== NULL
||
7262 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7263 _mesa_glsl_error(&loc
, state
,
7264 "gl_PerVertex output must be redeclared as "
7268 if (this->instance_name
!= NULL
) {
7269 _mesa_glsl_error(&loc
, state
,
7270 "gl_PerVertex output may not be redeclared with "
7271 "an instance name");
7276 _mesa_glsl_error(&loc
, state
,
7277 "gl_PerVertex must be declared as an input or an "
7282 if (earlier_per_vertex
== NULL
) {
7283 /* An error has already been reported. Bail out to avoid null
7284 * dereferences later in this function.
7289 /* Copy locations from the old gl_PerVertex interface block. */
7290 for (unsigned i
= 0; i
< num_variables
; i
++) {
7291 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7293 _mesa_glsl_error(&loc
, state
,
7294 "redeclaration of gl_PerVertex must be a subset "
7295 "of the built-in members of gl_PerVertex");
7297 fields
[i
].location
=
7298 earlier_per_vertex
->fields
.structure
[j
].location
;
7300 earlier_per_vertex
->fields
.structure
[j
].offset
;
7301 fields
[i
].interpolation
=
7302 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7303 fields
[i
].centroid
=
7304 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7306 earlier_per_vertex
->fields
.structure
[j
].sample
;
7308 earlier_per_vertex
->fields
.structure
[j
].patch
;
7309 fields
[i
].precision
=
7310 earlier_per_vertex
->fields
.structure
[j
].precision
;
7311 fields
[i
].explicit_xfb_buffer
=
7312 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7313 fields
[i
].xfb_buffer
=
7314 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7315 fields
[i
].xfb_stride
=
7316 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7320 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7323 * If a built-in interface block is redeclared, it must appear in
7324 * the shader before any use of any member included in the built-in
7325 * declaration, or a compilation error will result.
7327 * This appears to be a clarification to the behaviour established for
7328 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7329 * regardless of GLSL version.
7331 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7332 v
.run(instructions
);
7333 if (v
.usage_found()) {
7334 _mesa_glsl_error(&loc
, state
,
7335 "redeclaration of a built-in interface block must "
7336 "appear before any use of any member of the "
7341 const glsl_type
*block_type
=
7342 glsl_type::get_interface_instance(fields
,
7347 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7349 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7350 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7353 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7354 YYLTYPE loc
= this->get_location();
7355 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7356 "already taken in the current scope",
7357 this->block_name
, iface_type_name
);
7360 /* Since interface blocks cannot contain statements, it should be
7361 * impossible for the block to generate any instructions.
7363 assert(declared_variables
.is_empty());
7365 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7367 * Geometry shader input variables get the per-vertex values written
7368 * out by vertex shader output variables of the same names. Since a
7369 * geometry shader operates on a set of vertices, each input varying
7370 * variable (or input block, see interface blocks below) needs to be
7371 * declared as an array.
7373 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7374 var_mode
== ir_var_shader_in
) {
7375 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7376 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7377 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7378 this->array_specifier
== NULL
&&
7379 var_mode
== ir_var_shader_in
) {
7380 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7381 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7382 this->array_specifier
== NULL
&&
7383 var_mode
== ir_var_shader_out
) {
7384 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7388 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7391 * "If an instance name (instance-name) is used, then it puts all the
7392 * members inside a scope within its own name space, accessed with the
7393 * field selector ( . ) operator (analogously to structures)."
7395 if (this->instance_name
) {
7396 if (redeclaring_per_vertex
) {
7397 /* When a built-in in an unnamed interface block is redeclared,
7398 * get_variable_being_redeclared() calls
7399 * check_builtin_array_max_size() to make sure that built-in array
7400 * variables aren't redeclared to illegal sizes. But we're looking
7401 * at a redeclaration of a named built-in interface block. So we
7402 * have to manually call check_builtin_array_max_size() for all parts
7403 * of the interface that are arrays.
7405 for (unsigned i
= 0; i
< num_variables
; i
++) {
7406 if (fields
[i
].type
->is_array()) {
7407 const unsigned size
= fields
[i
].type
->array_size();
7408 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7412 validate_identifier(this->instance_name
, loc
, state
);
7417 if (this->array_specifier
!= NULL
) {
7418 const glsl_type
*block_array_type
=
7419 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7421 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7423 * For uniform blocks declared an array, each individual array
7424 * element corresponds to a separate buffer object backing one
7425 * instance of the block. As the array size indicates the number
7426 * of buffer objects needed, uniform block array declarations
7427 * must specify an array size.
7429 * And a few paragraphs later:
7431 * Geometry shader input blocks must be declared as arrays and
7432 * follow the array declaration and linking rules for all
7433 * geometry shader inputs. All other input and output block
7434 * arrays must specify an array size.
7436 * The same applies to tessellation shaders.
7438 * The upshot of this is that the only circumstance where an
7439 * interface array size *doesn't* need to be specified is on a
7440 * geometry shader input, tessellation control shader input,
7441 * tessellation control shader output, and tessellation evaluation
7444 if (block_array_type
->is_unsized_array()) {
7445 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7446 state
->stage
== MESA_SHADER_TESS_CTRL
||
7447 state
->stage
== MESA_SHADER_TESS_EVAL
;
7448 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7450 if (this->layout
.flags
.q
.in
) {
7452 _mesa_glsl_error(&loc
, state
,
7453 "unsized input block arrays not allowed in "
7455 _mesa_shader_stage_to_string(state
->stage
));
7456 } else if (this->layout
.flags
.q
.out
) {
7458 _mesa_glsl_error(&loc
, state
,
7459 "unsized output block arrays not allowed in "
7461 _mesa_shader_stage_to_string(state
->stage
));
7463 /* by elimination, this is a uniform block array */
7464 _mesa_glsl_error(&loc
, state
,
7465 "unsized uniform block arrays not allowed in "
7467 _mesa_shader_stage_to_string(state
->stage
));
7471 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7473 * * Arrays of arrays of blocks are not allowed
7475 if (state
->es_shader
&& block_array_type
->is_array() &&
7476 block_array_type
->fields
.array
->is_array()) {
7477 _mesa_glsl_error(&loc
, state
,
7478 "arrays of arrays interface blocks are "
7482 var
= new(state
) ir_variable(block_array_type
,
7483 this->instance_name
,
7486 var
= new(state
) ir_variable(block_type
,
7487 this->instance_name
,
7491 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7492 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7494 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7495 var
->data
.read_only
= true;
7497 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7498 handle_geometry_shader_input_decl(state
, loc
, var
);
7499 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7500 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7501 handle_tess_shader_input_decl(state
, loc
, var
);
7502 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7503 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7505 for (unsigned i
= 0; i
< num_variables
; i
++) {
7506 if (var
->data
.mode
== ir_var_shader_storage
)
7507 apply_memory_qualifiers(var
, fields
[i
]);
7510 if (ir_variable
*earlier
=
7511 state
->symbols
->get_variable(this->instance_name
)) {
7512 if (!redeclaring_per_vertex
) {
7513 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7514 this->instance_name
);
7516 earlier
->data
.how_declared
= ir_var_declared_normally
;
7517 earlier
->type
= var
->type
;
7518 earlier
->reinit_interface_type(block_type
);
7521 if (this->layout
.flags
.q
.explicit_binding
) {
7522 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7526 var
->data
.stream
= qual_stream
;
7527 if (layout
.flags
.q
.explicit_location
) {
7528 var
->data
.location
= expl_location
;
7529 var
->data
.explicit_location
= true;
7532 state
->symbols
->add_variable(var
);
7533 instructions
->push_tail(var
);
7536 /* In order to have an array size, the block must also be declared with
7539 assert(this->array_specifier
== NULL
);
7541 for (unsigned i
= 0; i
< num_variables
; i
++) {
7543 new(state
) ir_variable(fields
[i
].type
,
7544 ralloc_strdup(state
, fields
[i
].name
),
7546 var
->data
.interpolation
= fields
[i
].interpolation
;
7547 var
->data
.centroid
= fields
[i
].centroid
;
7548 var
->data
.sample
= fields
[i
].sample
;
7549 var
->data
.patch
= fields
[i
].patch
;
7550 var
->data
.stream
= qual_stream
;
7551 var
->data
.location
= fields
[i
].location
;
7553 if (fields
[i
].location
!= -1)
7554 var
->data
.explicit_location
= true;
7556 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7557 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7559 if (fields
[i
].offset
!= -1)
7560 var
->data
.explicit_xfb_offset
= true;
7561 var
->data
.offset
= fields
[i
].offset
;
7563 var
->init_interface_type(block_type
);
7565 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7566 var
->data
.read_only
= true;
7568 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7569 if (state
->es_shader
) {
7570 var
->data
.precision
=
7571 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7575 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7576 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7577 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7579 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7582 if (var
->data
.mode
== ir_var_shader_storage
)
7583 apply_memory_qualifiers(var
, fields
[i
]);
7585 /* Examine var name here since var may get deleted in the next call */
7586 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7588 if (redeclaring_per_vertex
) {
7589 ir_variable
*earlier
=
7590 get_variable_being_redeclared(var
, loc
, state
,
7591 true /* allow_all_redeclarations */);
7592 if (!var_is_gl_id
|| earlier
== NULL
) {
7593 _mesa_glsl_error(&loc
, state
,
7594 "redeclaration of gl_PerVertex can only "
7595 "include built-in variables");
7596 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7597 _mesa_glsl_error(&loc
, state
,
7598 "`%s' has already been redeclared",
7601 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7602 earlier
->reinit_interface_type(block_type
);
7607 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7608 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7610 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7611 * The UBO declaration itself doesn't get an ir_variable unless it
7612 * has an instance name. This is ugly.
7614 if (this->layout
.flags
.q
.explicit_binding
) {
7615 apply_explicit_binding(state
, &loc
, var
,
7616 var
->get_interface_type(), &this->layout
);
7619 if (var
->type
->is_unsized_array()) {
7620 if (var
->is_in_shader_storage_block()) {
7621 if (is_unsized_array_last_element(var
)) {
7622 var
->data
.from_ssbo_unsized_array
= true;
7625 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7627 * "If an array is declared as the last member of a shader storage
7628 * block and the size is not specified at compile-time, it is
7629 * sized at run-time. In all other cases, arrays are sized only
7632 if (state
->es_shader
) {
7633 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
7634 "definition: only last member of a shader "
7635 "storage block can be defined as unsized "
7636 "array", fields
[i
].name
);
7641 state
->symbols
->add_variable(var
);
7642 instructions
->push_tail(var
);
7645 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7646 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7648 * It is also a compilation error ... to redeclare a built-in
7649 * block and then use a member from that built-in block that was
7650 * not included in the redeclaration.
7652 * This appears to be a clarification to the behaviour established
7653 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7654 * behaviour regardless of GLSL version.
7656 * To prevent the shader from using a member that was not included in
7657 * the redeclaration, we disable any ir_variables that are still
7658 * associated with the old declaration of gl_PerVertex (since we've
7659 * already updated all of the variables contained in the new
7660 * gl_PerVertex to point to it).
7662 * As a side effect this will prevent
7663 * validate_intrastage_interface_blocks() from getting confused and
7664 * thinking there are conflicting definitions of gl_PerVertex in the
7667 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7668 ir_variable
*const var
= node
->as_variable();
7670 var
->get_interface_type() == earlier_per_vertex
&&
7671 var
->data
.mode
== var_mode
) {
7672 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7673 _mesa_glsl_error(&loc
, state
,
7674 "redeclaration of gl_PerVertex cannot "
7675 "follow a redeclaration of `%s'",
7678 state
->symbols
->disable_variable(var
->name
);
7690 ast_tcs_output_layout::hir(exec_list
*instructions
,
7691 struct _mesa_glsl_parse_state
*state
)
7693 YYLTYPE loc
= this->get_location();
7695 unsigned num_vertices
;
7696 if (!state
->out_qualifier
->vertices
->
7697 process_qualifier_constant(state
, "vertices", &num_vertices
,
7699 /* return here to stop cascading incorrect error messages */
7703 /* If any shader outputs occurred before this declaration and specified an
7704 * array size, make sure the size they specified is consistent with the
7707 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7708 _mesa_glsl_error(&loc
, state
,
7709 "this tessellation control shader output layout "
7710 "specifies %u vertices, but a previous output "
7711 "is declared with size %u",
7712 num_vertices
, state
->tcs_output_size
);
7716 state
->tcs_output_vertices_specified
= true;
7718 /* If any shader outputs occurred before this declaration and did not
7719 * specify an array size, their size is determined now.
7721 foreach_in_list (ir_instruction
, node
, instructions
) {
7722 ir_variable
*var
= node
->as_variable();
7723 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7726 /* Note: Not all tessellation control shader output are arrays. */
7727 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7730 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7731 _mesa_glsl_error(&loc
, state
,
7732 "this tessellation control shader output layout "
7733 "specifies %u vertices, but an access to element "
7734 "%u of output `%s' already exists", num_vertices
,
7735 var
->data
.max_array_access
, var
->name
);
7737 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7747 ast_gs_input_layout::hir(exec_list
*instructions
,
7748 struct _mesa_glsl_parse_state
*state
)
7750 YYLTYPE loc
= this->get_location();
7752 /* If any geometry input layout declaration preceded this one, make sure it
7753 * was consistent with this one.
7755 if (state
->gs_input_prim_type_specified
&&
7756 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7757 _mesa_glsl_error(&loc
, state
,
7758 "geometry shader input layout does not match"
7759 " previous declaration");
7763 /* If any shader inputs occurred before this declaration and specified an
7764 * array size, make sure the size they specified is consistent with the
7767 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7768 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7769 _mesa_glsl_error(&loc
, state
,
7770 "this geometry shader input layout implies %u vertices"
7771 " per primitive, but a previous input is declared"
7772 " with size %u", num_vertices
, state
->gs_input_size
);
7776 state
->gs_input_prim_type_specified
= true;
7778 /* If any shader inputs occurred before this declaration and did not
7779 * specify an array size, their size is determined now.
7781 foreach_in_list(ir_instruction
, node
, instructions
) {
7782 ir_variable
*var
= node
->as_variable();
7783 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7786 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7790 if (var
->type
->is_unsized_array()) {
7791 if (var
->data
.max_array_access
>= (int)num_vertices
) {
7792 _mesa_glsl_error(&loc
, state
,
7793 "this geometry shader input layout implies %u"
7794 " vertices, but an access to element %u of input"
7795 " `%s' already exists", num_vertices
,
7796 var
->data
.max_array_access
, var
->name
);
7798 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7809 ast_cs_input_layout::hir(exec_list
*instructions
,
7810 struct _mesa_glsl_parse_state
*state
)
7812 YYLTYPE loc
= this->get_location();
7814 /* From the ARB_compute_shader specification:
7816 * If the local size of the shader in any dimension is greater
7817 * than the maximum size supported by the implementation for that
7818 * dimension, a compile-time error results.
7820 * It is not clear from the spec how the error should be reported if
7821 * the total size of the work group exceeds
7822 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7823 * report it at compile time as well.
7825 GLuint64 total_invocations
= 1;
7826 unsigned qual_local_size
[3];
7827 for (int i
= 0; i
< 3; i
++) {
7829 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7831 /* Infer a local_size of 1 for unspecified dimensions */
7832 if (this->local_size
[i
] == NULL
) {
7833 qual_local_size
[i
] = 1;
7834 } else if (!this->local_size
[i
]->
7835 process_qualifier_constant(state
, local_size_str
,
7836 &qual_local_size
[i
], false)) {
7837 ralloc_free(local_size_str
);
7840 ralloc_free(local_size_str
);
7842 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7843 _mesa_glsl_error(&loc
, state
,
7844 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7846 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7849 total_invocations
*= qual_local_size
[i
];
7850 if (total_invocations
>
7851 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7852 _mesa_glsl_error(&loc
, state
,
7853 "product of local_sizes exceeds "
7854 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7855 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7860 /* If any compute input layout declaration preceded this one, make sure it
7861 * was consistent with this one.
7863 if (state
->cs_input_local_size_specified
) {
7864 for (int i
= 0; i
< 3; i
++) {
7865 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7866 _mesa_glsl_error(&loc
, state
,
7867 "compute shader input layout does not match"
7868 " previous declaration");
7874 state
->cs_input_local_size_specified
= true;
7875 for (int i
= 0; i
< 3; i
++)
7876 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7878 /* We may now declare the built-in constant gl_WorkGroupSize (see
7879 * builtin_variable_generator::generate_constants() for why we didn't
7880 * declare it earlier).
7882 ir_variable
*var
= new(state
->symbols
)
7883 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7884 var
->data
.how_declared
= ir_var_declared_implicitly
;
7885 var
->data
.read_only
= true;
7886 instructions
->push_tail(var
);
7887 state
->symbols
->add_variable(var
);
7888 ir_constant_data data
;
7889 memset(&data
, 0, sizeof(data
));
7890 for (int i
= 0; i
< 3; i
++)
7891 data
.u
[i
] = qual_local_size
[i
];
7892 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7893 var
->constant_initializer
=
7894 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7895 var
->data
.has_initializer
= true;
7902 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7903 exec_list
*instructions
)
7905 bool gl_FragColor_assigned
= false;
7906 bool gl_FragData_assigned
= false;
7907 bool gl_FragSecondaryColor_assigned
= false;
7908 bool gl_FragSecondaryData_assigned
= false;
7909 bool user_defined_fs_output_assigned
= false;
7910 ir_variable
*user_defined_fs_output
= NULL
;
7912 /* It would be nice to have proper location information. */
7914 memset(&loc
, 0, sizeof(loc
));
7916 foreach_in_list(ir_instruction
, node
, instructions
) {
7917 ir_variable
*var
= node
->as_variable();
7919 if (!var
|| !var
->data
.assigned
)
7922 if (strcmp(var
->name
, "gl_FragColor") == 0)
7923 gl_FragColor_assigned
= true;
7924 else if (strcmp(var
->name
, "gl_FragData") == 0)
7925 gl_FragData_assigned
= true;
7926 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7927 gl_FragSecondaryColor_assigned
= true;
7928 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7929 gl_FragSecondaryData_assigned
= true;
7930 else if (!is_gl_identifier(var
->name
)) {
7931 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7932 var
->data
.mode
== ir_var_shader_out
) {
7933 user_defined_fs_output_assigned
= true;
7934 user_defined_fs_output
= var
;
7939 /* From the GLSL 1.30 spec:
7941 * "If a shader statically assigns a value to gl_FragColor, it
7942 * may not assign a value to any element of gl_FragData. If a
7943 * shader statically writes a value to any element of
7944 * gl_FragData, it may not assign a value to
7945 * gl_FragColor. That is, a shader may assign values to either
7946 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7947 * linked together must also consistently write just one of
7948 * these variables. Similarly, if user declared output
7949 * variables are in use (statically assigned to), then the
7950 * built-in variables gl_FragColor and gl_FragData may not be
7951 * assigned to. These incorrect usages all generate compile
7954 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7955 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7956 "`gl_FragColor' and `gl_FragData'");
7957 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7958 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7959 "`gl_FragColor' and `%s'",
7960 user_defined_fs_output
->name
);
7961 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7962 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7963 "`gl_FragSecondaryColorEXT' and"
7964 " `gl_FragSecondaryDataEXT'");
7965 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7966 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7967 "`gl_FragColor' and"
7968 " `gl_FragSecondaryDataEXT'");
7969 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7970 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7972 " `gl_FragSecondaryColorEXT'");
7973 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7974 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7975 "`gl_FragData' and `%s'",
7976 user_defined_fs_output
->name
);
7979 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7980 !state
->EXT_blend_func_extended_enable
) {
7981 _mesa_glsl_error(&loc
, state
,
7982 "Dual source blending requires EXT_blend_func_extended");
7988 remove_per_vertex_blocks(exec_list
*instructions
,
7989 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7991 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7992 * if it exists in this shader type.
7994 const glsl_type
*per_vertex
= NULL
;
7996 case ir_var_shader_in
:
7997 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7998 per_vertex
= gl_in
->get_interface_type();
8000 case ir_var_shader_out
:
8001 if (ir_variable
*gl_Position
=
8002 state
->symbols
->get_variable("gl_Position")) {
8003 per_vertex
= gl_Position
->get_interface_type();
8007 assert(!"Unexpected mode");
8011 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8012 * need to do anything.
8014 if (per_vertex
== NULL
)
8017 /* If the interface block is used by the shader, then we don't need to do
8020 interface_block_usage_visitor
v(mode
, per_vertex
);
8021 v
.run(instructions
);
8022 if (v
.usage_found())
8025 /* Remove any ir_variable declarations that refer to the interface block
8028 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8029 ir_variable
*const var
= node
->as_variable();
8030 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8031 var
->data
.mode
== mode
) {
8032 state
->symbols
->disable_variable(var
->name
);