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 "glsl_types.h"
56 #include "program/hash_table.h"
57 #include "main/shaderobj.h"
59 #include "ir_builder.h"
61 using namespace ir_builder
;
64 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
65 exec_list
*instructions
);
67 remove_per_vertex_blocks(exec_list
*instructions
,
68 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
71 * Visitor class that finds the first instance of any write-only variable that
72 * is ever read, if any
74 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
77 read_from_write_only_variable_visitor() : found(NULL
)
81 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
83 if (this->in_assignee
)
84 return visit_continue
;
86 ir_variable
*var
= ir
->variable_referenced();
87 /* We can have image_write_only set on both images and buffer variables,
88 * but in the former there is a distinction between reads from
89 * the variable itself (write_only) and from the memory they point to
90 * (image_write_only), while in the case of buffer variables there is
91 * no such distinction, that is why this check here is limited to
92 * buffer variables alone.
94 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
95 return visit_continue
;
97 if (var
->data
.image_write_only
) {
102 return visit_continue
;
105 ir_variable
*get_variable() {
114 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
116 _mesa_glsl_initialize_variables(instructions
, state
);
118 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
120 state
->current_function
= NULL
;
122 state
->toplevel_ir
= instructions
;
124 state
->gs_input_prim_type_specified
= false;
125 state
->tcs_output_vertices_specified
= false;
126 state
->cs_input_local_size_specified
= false;
128 /* Section 4.2 of the GLSL 1.20 specification states:
129 * "The built-in functions are scoped in a scope outside the global scope
130 * users declare global variables in. That is, a shader's global scope,
131 * available for user-defined functions and global variables, is nested
132 * inside the scope containing the built-in functions."
134 * Since built-in functions like ftransform() access built-in variables,
135 * it follows that those must be in the outer scope as well.
137 * We push scope here to create this nesting effect...but don't pop.
138 * This way, a shader's globals are still in the symbol table for use
141 state
->symbols
->push_scope();
143 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
144 ast
->hir(instructions
, state
);
146 detect_recursion_unlinked(state
, instructions
);
147 detect_conflicting_assignments(state
, instructions
);
149 state
->toplevel_ir
= NULL
;
151 /* Move all of the variable declarations to the front of the IR list, and
152 * reverse the order. This has the (intended!) side effect that vertex
153 * shader inputs and fragment shader outputs will appear in the IR in the
154 * same order that they appeared in the shader code. This results in the
155 * locations being assigned in the declared order. Many (arguably buggy)
156 * applications depend on this behavior, and it matches what nearly all
159 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
160 ir_variable
*const var
= node
->as_variable();
166 instructions
->push_head(var
);
169 /* Figure out if gl_FragCoord is actually used in fragment shader */
170 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
172 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
174 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
176 * If multiple shaders using members of a built-in block belonging to
177 * the same interface are linked together in the same program, they
178 * must all redeclare the built-in block in the same way, as described
179 * in section 4.3.7 "Interface Blocks" for interface block matching, or
180 * a link error will result.
182 * The phrase "using members of a built-in block" implies that if two
183 * shaders are linked together and one of them *does not use* any members
184 * of the built-in block, then that shader does not need to have a matching
185 * redeclaration of the built-in block.
187 * This appears to be a clarification to the behaviour established for
188 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
191 * The definition of "interface" in section 4.3.7 that applies here is as
194 * The boundary between adjacent programmable pipeline stages: This
195 * spans all the outputs in all compilation units of the first stage
196 * and all the inputs in all compilation units of the second stage.
198 * Therefore this rule applies to both inter- and intra-stage linking.
200 * The easiest way to implement this is to check whether the shader uses
201 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
202 * remove all the relevant variable declaration from the IR, so that the
203 * linker won't see them and complain about mismatches.
205 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
206 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
208 /* Check that we don't have reads from write-only variables */
209 read_from_write_only_variable_visitor v
;
211 ir_variable
*error_var
= v
.get_variable();
213 /* It would be nice to have proper location information, but for that
214 * we would need to check this as we process each kind of AST node
217 memset(&loc
, 0, sizeof(loc
));
218 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
224 static ir_expression_operation
225 get_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
226 struct _mesa_glsl_parse_state
*state
)
228 switch (to
->base_type
) {
229 case GLSL_TYPE_FLOAT
:
230 switch (from
->base_type
) {
231 case GLSL_TYPE_INT
: return ir_unop_i2f
;
232 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
233 case GLSL_TYPE_DOUBLE
: return ir_unop_d2f
;
234 default: return (ir_expression_operation
)0;
238 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
)
239 return (ir_expression_operation
)0;
240 switch (from
->base_type
) {
241 case GLSL_TYPE_INT
: return ir_unop_i2u
;
242 default: return (ir_expression_operation
)0;
245 case GLSL_TYPE_DOUBLE
:
246 if (!state
->has_double())
247 return (ir_expression_operation
)0;
248 switch (from
->base_type
) {
249 case GLSL_TYPE_INT
: return ir_unop_i2d
;
250 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
251 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
252 default: return (ir_expression_operation
)0;
255 default: return (ir_expression_operation
)0;
261 * If a conversion is available, convert one operand to a different type
263 * The \c from \c ir_rvalue is converted "in place".
265 * \param to Type that the operand it to be converted to
266 * \param from Operand that is being converted
267 * \param state GLSL compiler state
270 * If a conversion is possible (or unnecessary), \c true is returned.
271 * Otherwise \c false is returned.
274 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
275 struct _mesa_glsl_parse_state
*state
)
278 if (to
->base_type
== from
->type
->base_type
)
281 /* Prior to GLSL 1.20, there are no implicit conversions */
282 if (!state
->is_version(120, 0))
285 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
287 * "There are no implicit array or structure conversions. For
288 * example, an array of int cannot be implicitly converted to an
291 if (!to
->is_numeric() || !from
->type
->is_numeric())
294 /* We don't actually want the specific type `to`, we want a type
295 * with the same base type as `to`, but the same vector width as
298 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
299 from
->type
->matrix_columns
);
301 ir_expression_operation op
= get_conversion_operation(to
, from
->type
, state
);
303 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
311 static const struct glsl_type
*
312 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
314 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
316 const glsl_type
*type_a
= value_a
->type
;
317 const glsl_type
*type_b
= value_b
->type
;
319 /* From GLSL 1.50 spec, page 56:
321 * "The arithmetic binary operators add (+), subtract (-),
322 * multiply (*), and divide (/) operate on integer and
323 * floating-point scalars, vectors, and matrices."
325 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
326 _mesa_glsl_error(loc
, state
,
327 "operands to arithmetic operators must be numeric");
328 return glsl_type::error_type
;
332 /* "If one operand is floating-point based and the other is
333 * not, then the conversions from Section 4.1.10 "Implicit
334 * Conversions" are applied to the non-floating-point-based operand."
336 if (!apply_implicit_conversion(type_a
, value_b
, state
)
337 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
338 _mesa_glsl_error(loc
, state
,
339 "could not implicitly convert operands to "
340 "arithmetic operator");
341 return glsl_type::error_type
;
343 type_a
= value_a
->type
;
344 type_b
= value_b
->type
;
346 /* "If the operands are integer types, they must both be signed or
349 * From this rule and the preceeding conversion it can be inferred that
350 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
351 * The is_numeric check above already filtered out the case where either
352 * type is not one of these, so now the base types need only be tested for
355 if (type_a
->base_type
!= type_b
->base_type
) {
356 _mesa_glsl_error(loc
, state
,
357 "base type mismatch for arithmetic operator");
358 return glsl_type::error_type
;
361 /* "All arithmetic binary operators result in the same fundamental type
362 * (signed integer, unsigned integer, or floating-point) as the
363 * operands they operate on, after operand type conversion. After
364 * conversion, the following cases are valid
366 * * The two operands are scalars. In this case the operation is
367 * applied, resulting in a scalar."
369 if (type_a
->is_scalar() && type_b
->is_scalar())
372 /* "* One operand is a scalar, and the other is a vector or matrix.
373 * In this case, the scalar operation is applied independently to each
374 * component of the vector or matrix, resulting in the same size
377 if (type_a
->is_scalar()) {
378 if (!type_b
->is_scalar())
380 } else if (type_b
->is_scalar()) {
384 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
385 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
388 assert(!type_a
->is_scalar());
389 assert(!type_b
->is_scalar());
391 /* "* The two operands are vectors of the same size. In this case, the
392 * operation is done component-wise resulting in the same size
395 if (type_a
->is_vector() && type_b
->is_vector()) {
396 if (type_a
== type_b
) {
399 _mesa_glsl_error(loc
, state
,
400 "vector size mismatch for arithmetic operator");
401 return glsl_type::error_type
;
405 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
406 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
407 * <vector, vector> have been handled. At least one of the operands must
408 * be matrix. Further, since there are no integer matrix types, the base
409 * type of both operands must be float.
411 assert(type_a
->is_matrix() || type_b
->is_matrix());
412 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
||
413 type_a
->base_type
== GLSL_TYPE_DOUBLE
);
414 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
||
415 type_b
->base_type
== GLSL_TYPE_DOUBLE
);
417 /* "* The operator is add (+), subtract (-), or divide (/), and the
418 * operands are matrices with the same number of rows and the same
419 * number of columns. In this case, the operation is done component-
420 * wise resulting in the same size matrix."
421 * * The operator is multiply (*), where both operands are matrices or
422 * one operand is a vector and the other a matrix. A right vector
423 * operand is treated as a column vector and a left vector operand as a
424 * row vector. In all these cases, it is required that the number of
425 * columns of the left operand is equal to the number of rows of the
426 * right operand. Then, the multiply (*) operation does a linear
427 * algebraic multiply, yielding an object that has the same number of
428 * rows as the left operand and the same number of columns as the right
429 * operand. Section 5.10 "Vector and Matrix Operations" explains in
430 * more detail how vectors and matrices are operated on."
433 if (type_a
== type_b
)
436 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
438 if (type
== glsl_type::error_type
) {
439 _mesa_glsl_error(loc
, state
,
440 "size mismatch for matrix multiplication");
447 /* "All other cases are illegal."
449 _mesa_glsl_error(loc
, state
, "type mismatch");
450 return glsl_type::error_type
;
454 static const struct glsl_type
*
455 unary_arithmetic_result_type(const struct glsl_type
*type
,
456 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
458 /* From GLSL 1.50 spec, page 57:
460 * "The arithmetic unary operators negate (-), post- and pre-increment
461 * and decrement (-- and ++) operate on integer or floating-point
462 * values (including vectors and matrices). All unary operators work
463 * component-wise on their operands. These result with the same type
466 if (!type
->is_numeric()) {
467 _mesa_glsl_error(loc
, state
,
468 "operands to arithmetic operators must be numeric");
469 return glsl_type::error_type
;
476 * \brief Return the result type of a bit-logic operation.
478 * If the given types to the bit-logic operator are invalid, return
479 * glsl_type::error_type.
481 * \param type_a Type of LHS of bit-logic op
482 * \param type_b Type of RHS of bit-logic op
484 static const struct glsl_type
*
485 bit_logic_result_type(const struct glsl_type
*type_a
,
486 const struct glsl_type
*type_b
,
488 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
490 if (!state
->check_bitwise_operations_allowed(loc
)) {
491 return glsl_type::error_type
;
494 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
496 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
497 * (|). The operands must be of type signed or unsigned integers or
500 if (!type_a
->is_integer()) {
501 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
502 ast_expression::operator_string(op
));
503 return glsl_type::error_type
;
505 if (!type_b
->is_integer()) {
506 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
507 ast_expression::operator_string(op
));
508 return glsl_type::error_type
;
511 /* "The fundamental types of the operands (signed or unsigned) must
514 if (type_a
->base_type
!= type_b
->base_type
) {
515 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
516 "base type", ast_expression::operator_string(op
));
517 return glsl_type::error_type
;
520 /* "The operands cannot be vectors of differing size." */
521 if (type_a
->is_vector() &&
522 type_b
->is_vector() &&
523 type_a
->vector_elements
!= type_b
->vector_elements
) {
524 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
525 "different sizes", ast_expression::operator_string(op
));
526 return glsl_type::error_type
;
529 /* "If one operand is a scalar and the other a vector, the scalar is
530 * applied component-wise to the vector, resulting in the same type as
531 * the vector. The fundamental types of the operands [...] will be the
532 * resulting fundamental type."
534 if (type_a
->is_scalar())
540 static const struct glsl_type
*
541 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
542 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
544 const glsl_type
*type_a
= value_a
->type
;
545 const glsl_type
*type_b
= value_b
->type
;
547 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
548 return glsl_type::error_type
;
551 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
553 * "The operator modulus (%) operates on signed or unsigned integers or
556 if (!type_a
->is_integer()) {
557 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
558 return glsl_type::error_type
;
560 if (!type_b
->is_integer()) {
561 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
562 return glsl_type::error_type
;
565 /* "If the fundamental types in the operands do not match, then the
566 * conversions from section 4.1.10 "Implicit Conversions" are applied
567 * to create matching types."
569 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
570 * int -> uint conversion rules. Prior to that, there were no implicit
571 * conversions. So it's harmless to apply them universally - no implicit
572 * conversions will exist. If the types don't match, we'll receive false,
573 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
575 * "The operand types must both be signed or unsigned."
577 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
578 !apply_implicit_conversion(type_b
, value_a
, state
)) {
579 _mesa_glsl_error(loc
, state
,
580 "could not implicitly convert operands to "
581 "modulus (%%) operator");
582 return glsl_type::error_type
;
584 type_a
= value_a
->type
;
585 type_b
= value_b
->type
;
587 /* "The operands cannot be vectors of differing size. If one operand is
588 * a scalar and the other vector, then the scalar is applied component-
589 * wise to the vector, resulting in the same type as the vector. If both
590 * are vectors of the same size, the result is computed component-wise."
592 if (type_a
->is_vector()) {
593 if (!type_b
->is_vector()
594 || (type_a
->vector_elements
== type_b
->vector_elements
))
599 /* "The operator modulus (%) is not defined for any other data types
600 * (non-integer types)."
602 _mesa_glsl_error(loc
, state
, "type mismatch");
603 return glsl_type::error_type
;
607 static const struct glsl_type
*
608 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
609 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
611 const glsl_type
*type_a
= value_a
->type
;
612 const glsl_type
*type_b
= value_b
->type
;
614 /* From GLSL 1.50 spec, page 56:
615 * "The relational operators greater than (>), less than (<), greater
616 * than or equal (>=), and less than or equal (<=) operate only on
617 * scalar integer and scalar floating-point expressions."
619 if (!type_a
->is_numeric()
620 || !type_b
->is_numeric()
621 || !type_a
->is_scalar()
622 || !type_b
->is_scalar()) {
623 _mesa_glsl_error(loc
, state
,
624 "operands to relational operators must be scalar and "
626 return glsl_type::error_type
;
629 /* "Either the operands' types must match, or the conversions from
630 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
631 * operand, after which the types must match."
633 if (!apply_implicit_conversion(type_a
, value_b
, state
)
634 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
635 _mesa_glsl_error(loc
, state
,
636 "could not implicitly convert operands to "
637 "relational operator");
638 return glsl_type::error_type
;
640 type_a
= value_a
->type
;
641 type_b
= value_b
->type
;
643 if (type_a
->base_type
!= type_b
->base_type
) {
644 _mesa_glsl_error(loc
, state
, "base type mismatch");
645 return glsl_type::error_type
;
648 /* "The result is scalar Boolean."
650 return glsl_type::bool_type
;
654 * \brief Return the result type of a bit-shift operation.
656 * If the given types to the bit-shift operator are invalid, return
657 * glsl_type::error_type.
659 * \param type_a Type of LHS of bit-shift op
660 * \param type_b Type of RHS of bit-shift op
662 static const struct glsl_type
*
663 shift_result_type(const struct glsl_type
*type_a
,
664 const struct glsl_type
*type_b
,
666 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
668 if (!state
->check_bitwise_operations_allowed(loc
)) {
669 return glsl_type::error_type
;
672 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
674 * "The shift operators (<<) and (>>). For both operators, the operands
675 * must be signed or unsigned integers or integer vectors. One operand
676 * can be signed while the other is unsigned."
678 if (!type_a
->is_integer()) {
679 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
680 "integer vector", ast_expression::operator_string(op
));
681 return glsl_type::error_type
;
684 if (!type_b
->is_integer()) {
685 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
686 "integer vector", ast_expression::operator_string(op
));
687 return glsl_type::error_type
;
690 /* "If the first operand is a scalar, the second operand has to be
693 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
694 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
695 "second must be scalar as well",
696 ast_expression::operator_string(op
));
697 return glsl_type::error_type
;
700 /* If both operands are vectors, check that they have same number of
703 if (type_a
->is_vector() &&
704 type_b
->is_vector() &&
705 type_a
->vector_elements
!= type_b
->vector_elements
) {
706 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
707 "have same number of elements",
708 ast_expression::operator_string(op
));
709 return glsl_type::error_type
;
712 /* "In all cases, the resulting type will be the same type as the left
719 * Returns the innermost array index expression in an rvalue tree.
720 * This is the largest indexing level -- if an array of blocks, then
721 * it is the block index rather than an indexing expression for an
722 * array-typed member of an array of blocks.
725 find_innermost_array_index(ir_rvalue
*rv
)
727 ir_dereference_array
*last
= NULL
;
729 if (rv
->as_dereference_array()) {
730 last
= rv
->as_dereference_array();
732 } else if (rv
->as_dereference_record())
733 rv
= rv
->as_dereference_record()->record
;
734 else if (rv
->as_swizzle())
735 rv
= rv
->as_swizzle()->val
;
741 return last
->array_index
;
747 * Validates that a value can be assigned to a location with a specified type
749 * Validates that \c rhs can be assigned to some location. If the types are
750 * not an exact match but an automatic conversion is possible, \c rhs will be
754 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
755 * Otherwise the actual RHS to be assigned will be returned. This may be
756 * \c rhs, or it may be \c rhs after some type conversion.
759 * In addition to being used for assignments, this function is used to
760 * type-check return values.
763 validate_assignment(struct _mesa_glsl_parse_state
*state
,
764 YYLTYPE loc
, ir_rvalue
*lhs
,
765 ir_rvalue
*rhs
, bool is_initializer
)
767 /* If there is already some error in the RHS, just return it. Anything
768 * else will lead to an avalanche of error message back to the user.
770 if (rhs
->type
->is_error())
773 /* In the Tessellation Control Shader:
774 * If a per-vertex output variable is used as an l-value, it is an error
775 * if the expression indicating the vertex number is not the identifier
778 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
779 ir_variable
*var
= lhs
->variable_referenced();
780 if (var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
781 ir_rvalue
*index
= find_innermost_array_index(lhs
);
782 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
783 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
784 _mesa_glsl_error(&loc
, state
,
785 "Tessellation control shader outputs can only "
786 "be indexed by gl_InvocationID");
792 /* If the types are identical, the assignment can trivially proceed.
794 if (rhs
->type
== lhs
->type
)
797 /* If the array element types are the same and the LHS is unsized,
798 * the assignment is okay for initializers embedded in variable
801 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
802 * is handled by ir_dereference::is_lvalue.
804 const glsl_type
*lhs_t
= lhs
->type
;
805 const glsl_type
*rhs_t
= rhs
->type
;
806 bool unsized_array
= false;
807 while(lhs_t
->is_array()) {
809 break; /* the rest of the inner arrays match so break out early */
810 if (!rhs_t
->is_array()) {
811 unsized_array
= false;
812 break; /* number of dimensions mismatch */
814 if (lhs_t
->length
== rhs_t
->length
) {
815 lhs_t
= lhs_t
->fields
.array
;
816 rhs_t
= rhs_t
->fields
.array
;
818 } else if (lhs_t
->is_unsized_array()) {
819 unsized_array
= true;
821 unsized_array
= false;
822 break; /* sized array mismatch */
824 lhs_t
= lhs_t
->fields
.array
;
825 rhs_t
= rhs_t
->fields
.array
;
828 if (is_initializer
) {
831 _mesa_glsl_error(&loc
, state
,
832 "implicitly sized arrays cannot be assigned");
837 /* Check for implicit conversion in GLSL 1.20 */
838 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
839 if (rhs
->type
== lhs
->type
)
843 _mesa_glsl_error(&loc
, state
,
844 "%s of type %s cannot be assigned to "
845 "variable of type %s",
846 is_initializer
? "initializer" : "value",
847 rhs
->type
->name
, lhs
->type
->name
);
853 mark_whole_array_access(ir_rvalue
*access
)
855 ir_dereference_variable
*deref
= access
->as_dereference_variable();
857 if (deref
&& deref
->var
) {
858 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
863 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
864 const char *non_lvalue_description
,
865 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
866 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
871 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
873 ir_variable
*lhs_var
= lhs
->variable_referenced();
875 lhs_var
->data
.assigned
= true;
877 if (!error_emitted
) {
878 if (non_lvalue_description
!= NULL
) {
879 _mesa_glsl_error(&lhs_loc
, state
,
881 non_lvalue_description
);
882 error_emitted
= true;
883 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
884 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
885 lhs_var
->data
.image_read_only
))) {
886 /* We can have image_read_only set on both images and buffer variables,
887 * but in the former there is a distinction between assignments to
888 * the variable itself (read_only) and to the memory they point to
889 * (image_read_only), while in the case of buffer variables there is
890 * no such distinction, that is why this check here is limited to
891 * buffer variables alone.
893 _mesa_glsl_error(&lhs_loc
, state
,
894 "assignment to read-only variable '%s'",
896 error_emitted
= true;
897 } else if (lhs
->type
->is_array() &&
898 !state
->check_version(120, 300, &lhs_loc
,
899 "whole array assignment forbidden")) {
900 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
902 * "Other binary or unary expressions, non-dereferenced
903 * arrays, function names, swizzles with repeated fields,
904 * and constants cannot be l-values."
906 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
908 error_emitted
= true;
909 } else if (!lhs
->is_lvalue()) {
910 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
911 error_emitted
= true;
916 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
917 if (new_rhs
!= NULL
) {
920 /* If the LHS array was not declared with a size, it takes it size from
921 * the RHS. If the LHS is an l-value and a whole array, it must be a
922 * dereference of a variable. Any other case would require that the LHS
923 * is either not an l-value or not a whole array.
925 if (lhs
->type
->is_unsized_array()) {
926 ir_dereference
*const d
= lhs
->as_dereference();
930 ir_variable
*const var
= d
->variable_referenced();
934 if (var
->data
.max_array_access
>= unsigned(rhs
->type
->array_size())) {
935 /* FINISHME: This should actually log the location of the RHS. */
936 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
938 var
->data
.max_array_access
);
941 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
942 rhs
->type
->array_size());
945 if (lhs
->type
->is_array()) {
946 mark_whole_array_access(rhs
);
947 mark_whole_array_access(lhs
);
951 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
952 * but not post_inc) need the converted assigned value as an rvalue
953 * to handle things like:
958 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
960 instructions
->push_tail(var
);
961 instructions
->push_tail(assign(var
, rhs
));
963 if (!error_emitted
) {
964 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
965 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
967 ir_rvalue
*rvalue
= new(ctx
) ir_dereference_variable(var
);
969 *out_rvalue
= rvalue
;
972 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
976 return error_emitted
;
980 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
982 void *ctx
= ralloc_parent(lvalue
);
985 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
987 instructions
->push_tail(var
);
989 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
992 return new(ctx
) ir_dereference_variable(var
);
997 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1006 ast_node::has_sequence_subexpression() const
1012 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1013 struct _mesa_glsl_parse_state
*state
)
1015 (void)hir(instructions
, state
);
1019 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1020 struct _mesa_glsl_parse_state
*state
)
1022 (void)hir(instructions
, state
);
1026 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1029 ir_rvalue
*cmp
= NULL
;
1031 if (operation
== ir_binop_all_equal
)
1032 join_op
= ir_binop_logic_and
;
1034 join_op
= ir_binop_logic_or
;
1036 switch (op0
->type
->base_type
) {
1037 case GLSL_TYPE_FLOAT
:
1038 case GLSL_TYPE_UINT
:
1040 case GLSL_TYPE_BOOL
:
1041 case GLSL_TYPE_DOUBLE
:
1042 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1044 case GLSL_TYPE_ARRAY
: {
1045 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1046 ir_rvalue
*e0
, *e1
, *result
;
1048 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1049 new(mem_ctx
) ir_constant(i
));
1050 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1051 new(mem_ctx
) ir_constant(i
));
1052 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1055 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1061 mark_whole_array_access(op0
);
1062 mark_whole_array_access(op1
);
1066 case GLSL_TYPE_STRUCT
: {
1067 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1068 ir_rvalue
*e0
, *e1
, *result
;
1069 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1071 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1073 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1075 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1078 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1086 case GLSL_TYPE_ERROR
:
1087 case GLSL_TYPE_VOID
:
1088 case GLSL_TYPE_SAMPLER
:
1089 case GLSL_TYPE_IMAGE
:
1090 case GLSL_TYPE_INTERFACE
:
1091 case GLSL_TYPE_ATOMIC_UINT
:
1092 case GLSL_TYPE_SUBROUTINE
:
1093 /* I assume a comparison of a struct containing a sampler just
1094 * ignores the sampler present in the type.
1100 cmp
= new(mem_ctx
) ir_constant(true);
1105 /* For logical operations, we want to ensure that the operands are
1106 * scalar booleans. If it isn't, emit an error and return a constant
1107 * boolean to avoid triggering cascading error messages.
1110 get_scalar_boolean_operand(exec_list
*instructions
,
1111 struct _mesa_glsl_parse_state
*state
,
1112 ast_expression
*parent_expr
,
1114 const char *operand_name
,
1115 bool *error_emitted
)
1117 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1119 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1121 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1124 if (!*error_emitted
) {
1125 YYLTYPE loc
= expr
->get_location();
1126 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1128 parent_expr
->operator_string(parent_expr
->oper
));
1129 *error_emitted
= true;
1132 return new(ctx
) ir_constant(true);
1136 * If name refers to a builtin array whose maximum allowed size is less than
1137 * size, report an error and return true. Otherwise return false.
1140 check_builtin_array_max_size(const char *name
, unsigned size
,
1141 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1143 if ((strcmp("gl_TexCoord", name
) == 0)
1144 && (size
> state
->Const
.MaxTextureCoords
)) {
1145 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1147 * "The size [of gl_TexCoord] can be at most
1148 * gl_MaxTextureCoords."
1150 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1151 "be larger than gl_MaxTextureCoords (%u)",
1152 state
->Const
.MaxTextureCoords
);
1153 } else if (strcmp("gl_ClipDistance", name
) == 0
1154 && size
> state
->Const
.MaxClipPlanes
) {
1155 /* From section 7.1 (Vertex Shader Special Variables) of the
1158 * "The gl_ClipDistance array is predeclared as unsized and
1159 * must be sized by the shader either redeclaring it with a
1160 * size or indexing it only with integral constant
1161 * expressions. ... The size can be at most
1162 * gl_MaxClipDistances."
1164 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1165 "be larger than gl_MaxClipDistances (%u)",
1166 state
->Const
.MaxClipPlanes
);
1171 * Create the constant 1, of a which is appropriate for incrementing and
1172 * decrementing values of the given GLSL type. For example, if type is vec4,
1173 * this creates a constant value of 1.0 having type float.
1175 * If the given type is invalid for increment and decrement operators, return
1176 * a floating point 1--the error will be detected later.
1179 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1181 switch (type
->base_type
) {
1182 case GLSL_TYPE_UINT
:
1183 return new(ctx
) ir_constant((unsigned) 1);
1185 return new(ctx
) ir_constant(1);
1187 case GLSL_TYPE_FLOAT
:
1188 return new(ctx
) ir_constant(1.0f
);
1193 ast_expression::hir(exec_list
*instructions
,
1194 struct _mesa_glsl_parse_state
*state
)
1196 return do_hir(instructions
, state
, true);
1200 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1201 struct _mesa_glsl_parse_state
*state
)
1203 do_hir(instructions
, state
, false);
1207 ast_expression::do_hir(exec_list
*instructions
,
1208 struct _mesa_glsl_parse_state
*state
,
1212 static const int operations
[AST_NUM_OPERATORS
] = {
1213 -1, /* ast_assign doesn't convert to ir_expression. */
1214 -1, /* ast_plus doesn't convert to ir_expression. */
1228 ir_binop_any_nequal
,
1238 /* Note: The following block of expression types actually convert
1239 * to multiple IR instructions.
1241 ir_binop_mul
, /* ast_mul_assign */
1242 ir_binop_div
, /* ast_div_assign */
1243 ir_binop_mod
, /* ast_mod_assign */
1244 ir_binop_add
, /* ast_add_assign */
1245 ir_binop_sub
, /* ast_sub_assign */
1246 ir_binop_lshift
, /* ast_ls_assign */
1247 ir_binop_rshift
, /* ast_rs_assign */
1248 ir_binop_bit_and
, /* ast_and_assign */
1249 ir_binop_bit_xor
, /* ast_xor_assign */
1250 ir_binop_bit_or
, /* ast_or_assign */
1252 -1, /* ast_conditional doesn't convert to ir_expression. */
1253 ir_binop_add
, /* ast_pre_inc. */
1254 ir_binop_sub
, /* ast_pre_dec. */
1255 ir_binop_add
, /* ast_post_inc. */
1256 ir_binop_sub
, /* ast_post_dec. */
1257 -1, /* ast_field_selection doesn't conv to ir_expression. */
1258 -1, /* ast_array_index doesn't convert to ir_expression. */
1259 -1, /* ast_function_call doesn't conv to ir_expression. */
1260 -1, /* ast_identifier doesn't convert to ir_expression. */
1261 -1, /* ast_int_constant doesn't convert to ir_expression. */
1262 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1263 -1, /* ast_float_constant doesn't conv to ir_expression. */
1264 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1265 -1, /* ast_sequence doesn't convert to ir_expression. */
1267 ir_rvalue
*result
= NULL
;
1269 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1270 bool error_emitted
= false;
1273 loc
= this->get_location();
1275 switch (this->oper
) {
1277 assert(!"ast_aggregate: Should never get here.");
1281 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1282 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1285 do_assignment(instructions
, state
,
1286 this->subexpressions
[0]->non_lvalue_description
,
1287 op
[0], op
[1], &result
, needs_rvalue
, false,
1288 this->subexpressions
[0]->get_location());
1293 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1295 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1297 error_emitted
= type
->is_error();
1303 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1305 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1307 error_emitted
= type
->is_error();
1309 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1317 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1318 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1320 type
= arithmetic_result_type(op
[0], op
[1],
1321 (this->oper
== ast_mul
),
1323 error_emitted
= type
->is_error();
1325 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1330 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1331 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1333 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1335 assert(operations
[this->oper
] == ir_binop_mod
);
1337 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1339 error_emitted
= type
->is_error();
1344 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1345 error_emitted
= true;
1348 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1349 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1350 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1352 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1354 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1361 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1362 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1364 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1366 /* The relational operators must either generate an error or result
1367 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1369 assert(type
->is_error()
1370 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1371 && type
->is_scalar()));
1373 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1375 error_emitted
= type
->is_error();
1380 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1381 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1383 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1385 * "The equality operators equal (==), and not equal (!=)
1386 * operate on all types. They result in a scalar Boolean. If
1387 * the operand types do not match, then there must be a
1388 * conversion from Section 4.1.10 "Implicit Conversions"
1389 * applied to one operand that can make them match, in which
1390 * case this conversion is done."
1393 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1394 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1395 "no operation `%1$s' exists that takes a left-hand "
1396 "operand of type 'void' or a right operand of type "
1397 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1398 error_emitted
= true;
1399 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1400 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1401 || (op
[0]->type
!= op
[1]->type
)) {
1402 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1403 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1404 error_emitted
= true;
1405 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1406 !state
->check_version(120, 300, &loc
,
1407 "array comparisons forbidden")) {
1408 error_emitted
= true;
1409 } else if ((op
[0]->type
->contains_opaque() ||
1410 op
[1]->type
->contains_opaque())) {
1411 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1412 error_emitted
= true;
1415 if (error_emitted
) {
1416 result
= new(ctx
) ir_constant(false);
1418 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1419 assert(result
->type
== glsl_type::bool_type
);
1426 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1427 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1428 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1430 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1432 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1436 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1438 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1439 error_emitted
= true;
1442 if (!op
[0]->type
->is_integer()) {
1443 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1444 error_emitted
= true;
1447 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1448 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1451 case ast_logic_and
: {
1452 exec_list rhs_instructions
;
1453 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1454 "LHS", &error_emitted
);
1455 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1456 "RHS", &error_emitted
);
1458 if (rhs_instructions
.is_empty()) {
1459 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1460 type
= result
->type
;
1462 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1465 instructions
->push_tail(tmp
);
1467 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1468 instructions
->push_tail(stmt
);
1470 stmt
->then_instructions
.append_list(&rhs_instructions
);
1471 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1472 ir_assignment
*const then_assign
=
1473 new(ctx
) ir_assignment(then_deref
, op
[1]);
1474 stmt
->then_instructions
.push_tail(then_assign
);
1476 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1477 ir_assignment
*const else_assign
=
1478 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1479 stmt
->else_instructions
.push_tail(else_assign
);
1481 result
= new(ctx
) ir_dereference_variable(tmp
);
1487 case ast_logic_or
: {
1488 exec_list rhs_instructions
;
1489 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1490 "LHS", &error_emitted
);
1491 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1492 "RHS", &error_emitted
);
1494 if (rhs_instructions
.is_empty()) {
1495 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1496 type
= result
->type
;
1498 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1501 instructions
->push_tail(tmp
);
1503 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1504 instructions
->push_tail(stmt
);
1506 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1507 ir_assignment
*const then_assign
=
1508 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1509 stmt
->then_instructions
.push_tail(then_assign
);
1511 stmt
->else_instructions
.append_list(&rhs_instructions
);
1512 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1513 ir_assignment
*const else_assign
=
1514 new(ctx
) ir_assignment(else_deref
, op
[1]);
1515 stmt
->else_instructions
.push_tail(else_assign
);
1517 result
= new(ctx
) ir_dereference_variable(tmp
);
1524 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1526 * "The logical binary operators and (&&), or ( | | ), and
1527 * exclusive or (^^). They operate only on two Boolean
1528 * expressions and result in a Boolean expression."
1530 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1532 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1535 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1540 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1541 "operand", &error_emitted
);
1543 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1547 case ast_mul_assign
:
1548 case ast_div_assign
:
1549 case ast_add_assign
:
1550 case ast_sub_assign
: {
1551 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1552 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1554 type
= arithmetic_result_type(op
[0], op
[1],
1555 (this->oper
== ast_mul_assign
),
1558 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1562 do_assignment(instructions
, state
,
1563 this->subexpressions
[0]->non_lvalue_description
,
1564 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1565 &result
, needs_rvalue
, false,
1566 this->subexpressions
[0]->get_location());
1568 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1569 * explicitly test for this because none of the binary expression
1570 * operators allow array operands either.
1576 case ast_mod_assign
: {
1577 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1578 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1580 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1582 assert(operations
[this->oper
] == ir_binop_mod
);
1584 ir_rvalue
*temp_rhs
;
1585 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1589 do_assignment(instructions
, state
,
1590 this->subexpressions
[0]->non_lvalue_description
,
1591 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1592 &result
, needs_rvalue
, false,
1593 this->subexpressions
[0]->get_location());
1598 case ast_rs_assign
: {
1599 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1600 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1601 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1603 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1604 type
, op
[0], op
[1]);
1606 do_assignment(instructions
, state
,
1607 this->subexpressions
[0]->non_lvalue_description
,
1608 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1609 &result
, needs_rvalue
, false,
1610 this->subexpressions
[0]->get_location());
1614 case ast_and_assign
:
1615 case ast_xor_assign
:
1616 case ast_or_assign
: {
1617 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1618 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1619 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1621 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1622 type
, op
[0], op
[1]);
1624 do_assignment(instructions
, state
,
1625 this->subexpressions
[0]->non_lvalue_description
,
1626 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1627 &result
, needs_rvalue
, false,
1628 this->subexpressions
[0]->get_location());
1632 case ast_conditional
: {
1633 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1635 * "The ternary selection operator (?:). It operates on three
1636 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1637 * first expression, which must result in a scalar Boolean."
1639 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1640 "condition", &error_emitted
);
1642 /* The :? operator is implemented by generating an anonymous temporary
1643 * followed by an if-statement. The last instruction in each branch of
1644 * the if-statement assigns a value to the anonymous temporary. This
1645 * temporary is the r-value of the expression.
1647 exec_list then_instructions
;
1648 exec_list else_instructions
;
1650 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1651 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1653 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1655 * "The second and third expressions can be any type, as
1656 * long their types match, or there is a conversion in
1657 * Section 4.1.10 "Implicit Conversions" that can be applied
1658 * to one of the expressions to make their types match. This
1659 * resulting matching type is the type of the entire
1662 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1663 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1664 || (op
[1]->type
!= op
[2]->type
)) {
1665 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1667 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1668 "operator must have matching types");
1669 error_emitted
= true;
1670 type
= glsl_type::error_type
;
1675 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1677 * "The second and third expressions must be the same type, but can
1678 * be of any type other than an array."
1680 if (type
->is_array() &&
1681 !state
->check_version(120, 300, &loc
,
1682 "second and third operands of ?: operator "
1683 "cannot be arrays")) {
1684 error_emitted
= true;
1687 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1689 * "Except for array indexing, structure member selection, and
1690 * parentheses, opaque variables are not allowed to be operands in
1691 * expressions; such use results in a compile-time error."
1693 if (type
->contains_opaque()) {
1694 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1695 "of the ?: operator");
1696 error_emitted
= true;
1699 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1701 if (then_instructions
.is_empty()
1702 && else_instructions
.is_empty()
1703 && cond_val
!= NULL
) {
1704 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1706 /* The copy to conditional_tmp reads the whole array. */
1707 if (type
->is_array()) {
1708 mark_whole_array_access(op
[1]);
1709 mark_whole_array_access(op
[2]);
1712 ir_variable
*const tmp
=
1713 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1714 instructions
->push_tail(tmp
);
1716 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1717 instructions
->push_tail(stmt
);
1719 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1720 ir_dereference
*const then_deref
=
1721 new(ctx
) ir_dereference_variable(tmp
);
1722 ir_assignment
*const then_assign
=
1723 new(ctx
) ir_assignment(then_deref
, op
[1]);
1724 stmt
->then_instructions
.push_tail(then_assign
);
1726 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1727 ir_dereference
*const else_deref
=
1728 new(ctx
) ir_dereference_variable(tmp
);
1729 ir_assignment
*const else_assign
=
1730 new(ctx
) ir_assignment(else_deref
, op
[2]);
1731 stmt
->else_instructions
.push_tail(else_assign
);
1733 result
= new(ctx
) ir_dereference_variable(tmp
);
1740 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1741 ? "pre-increment operation" : "pre-decrement operation";
1743 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1744 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1746 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1748 ir_rvalue
*temp_rhs
;
1749 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1753 do_assignment(instructions
, state
,
1754 this->subexpressions
[0]->non_lvalue_description
,
1755 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1756 &result
, needs_rvalue
, false,
1757 this->subexpressions
[0]->get_location());
1762 case ast_post_dec
: {
1763 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1764 ? "post-increment operation" : "post-decrement operation";
1765 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1766 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1768 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1770 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1772 ir_rvalue
*temp_rhs
;
1773 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1776 /* Get a temporary of a copy of the lvalue before it's modified.
1777 * This may get thrown away later.
1779 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1781 ir_rvalue
*junk_rvalue
;
1783 do_assignment(instructions
, state
,
1784 this->subexpressions
[0]->non_lvalue_description
,
1785 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1786 &junk_rvalue
, false, false,
1787 this->subexpressions
[0]->get_location());
1792 case ast_field_selection
:
1793 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1796 case ast_array_index
: {
1797 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1799 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1800 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1802 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1805 if (result
->type
->is_error())
1806 error_emitted
= true;
1811 case ast_unsized_array_dim
:
1812 assert(!"ast_unsized_array_dim: Should never get here.");
1815 case ast_function_call
:
1816 /* Should *NEVER* get here. ast_function_call should always be handled
1817 * by ast_function_expression::hir.
1822 case ast_identifier
: {
1823 /* ast_identifier can appear several places in a full abstract syntax
1824 * tree. This particular use must be at location specified in the grammar
1825 * as 'variable_identifier'.
1828 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1831 var
->data
.used
= true;
1832 result
= new(ctx
) ir_dereference_variable(var
);
1834 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1835 this->primary_expression
.identifier
);
1837 result
= ir_rvalue::error_value(ctx
);
1838 error_emitted
= true;
1843 case ast_int_constant
:
1844 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1847 case ast_uint_constant
:
1848 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1851 case ast_float_constant
:
1852 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1855 case ast_bool_constant
:
1856 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1859 case ast_double_constant
:
1860 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1863 case ast_sequence
: {
1864 /* It should not be possible to generate a sequence in the AST without
1865 * any expressions in it.
1867 assert(!this->expressions
.is_empty());
1869 /* The r-value of a sequence is the last expression in the sequence. If
1870 * the other expressions in the sequence do not have side-effects (and
1871 * therefore add instructions to the instruction list), they get dropped
1874 exec_node
*previous_tail_pred
= NULL
;
1875 YYLTYPE previous_operand_loc
= loc
;
1877 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1878 /* If one of the operands of comma operator does not generate any
1879 * code, we want to emit a warning. At each pass through the loop
1880 * previous_tail_pred will point to the last instruction in the
1881 * stream *before* processing the previous operand. Naturally,
1882 * instructions->tail_pred will point to the last instruction in the
1883 * stream *after* processing the previous operand. If the two
1884 * pointers match, then the previous operand had no effect.
1886 * The warning behavior here differs slightly from GCC. GCC will
1887 * only emit a warning if none of the left-hand operands have an
1888 * effect. However, it will emit a warning for each. I believe that
1889 * there are some cases in C (especially with GCC extensions) where
1890 * it is useful to have an intermediate step in a sequence have no
1891 * effect, but I don't think these cases exist in GLSL. Either way,
1892 * it would be a giant hassle to replicate that behavior.
1894 if (previous_tail_pred
== instructions
->tail_pred
) {
1895 _mesa_glsl_warning(&previous_operand_loc
, state
,
1896 "left-hand operand of comma expression has "
1900 /* tail_pred is directly accessed instead of using the get_tail()
1901 * method for performance reasons. get_tail() has extra code to
1902 * return NULL when the list is empty. We don't care about that
1903 * here, so using tail_pred directly is fine.
1905 previous_tail_pred
= instructions
->tail_pred
;
1906 previous_operand_loc
= ast
->get_location();
1908 result
= ast
->hir(instructions
, state
);
1911 /* Any errors should have already been emitted in the loop above.
1913 error_emitted
= true;
1917 type
= NULL
; /* use result->type, not type. */
1918 assert(result
!= NULL
|| !needs_rvalue
);
1920 if (result
&& result
->type
->is_error() && !error_emitted
)
1921 _mesa_glsl_error(& loc
, state
, "type mismatch");
1927 ast_expression::has_sequence_subexpression() const
1929 switch (this->oper
) {
1938 return this->subexpressions
[0]->has_sequence_subexpression();
1960 case ast_array_index
:
1961 case ast_mul_assign
:
1962 case ast_div_assign
:
1963 case ast_add_assign
:
1964 case ast_sub_assign
:
1965 case ast_mod_assign
:
1968 case ast_and_assign
:
1969 case ast_xor_assign
:
1971 return this->subexpressions
[0]->has_sequence_subexpression() ||
1972 this->subexpressions
[1]->has_sequence_subexpression();
1974 case ast_conditional
:
1975 return this->subexpressions
[0]->has_sequence_subexpression() ||
1976 this->subexpressions
[1]->has_sequence_subexpression() ||
1977 this->subexpressions
[2]->has_sequence_subexpression();
1982 case ast_field_selection
:
1983 case ast_identifier
:
1984 case ast_int_constant
:
1985 case ast_uint_constant
:
1986 case ast_float_constant
:
1987 case ast_bool_constant
:
1988 case ast_double_constant
:
1992 unreachable("ast_aggregate: Should never get here.");
1994 case ast_function_call
:
1995 unreachable("should be handled by ast_function_expression::hir");
1997 case ast_unsized_array_dim
:
1998 unreachable("ast_unsized_array_dim: Should never get here.");
2005 ast_expression_statement::hir(exec_list
*instructions
,
2006 struct _mesa_glsl_parse_state
*state
)
2008 /* It is possible to have expression statements that don't have an
2009 * expression. This is the solitary semicolon:
2011 * for (i = 0; i < 5; i++)
2014 * In this case the expression will be NULL. Test for NULL and don't do
2015 * anything in that case.
2017 if (expression
!= NULL
)
2018 expression
->hir_no_rvalue(instructions
, state
);
2020 /* Statements do not have r-values.
2027 ast_compound_statement::hir(exec_list
*instructions
,
2028 struct _mesa_glsl_parse_state
*state
)
2031 state
->symbols
->push_scope();
2033 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2034 ast
->hir(instructions
, state
);
2037 state
->symbols
->pop_scope();
2039 /* Compound statements do not have r-values.
2045 * Evaluate the given exec_node (which should be an ast_node representing
2046 * a single array dimension) and return its integer value.
2049 process_array_size(exec_node
*node
,
2050 struct _mesa_glsl_parse_state
*state
)
2052 exec_list dummy_instructions
;
2054 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2057 * Dimensions other than the outermost dimension can by unsized if they
2058 * are immediately sized by a constructor or initializer.
2060 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2063 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2064 YYLTYPE loc
= array_size
->get_location();
2067 _mesa_glsl_error(& loc
, state
,
2068 "array size could not be resolved");
2072 if (!ir
->type
->is_integer()) {
2073 _mesa_glsl_error(& loc
, state
,
2074 "array size must be integer type");
2078 if (!ir
->type
->is_scalar()) {
2079 _mesa_glsl_error(& loc
, state
,
2080 "array size must be scalar type");
2084 ir_constant
*const size
= ir
->constant_expression_value();
2085 if (size
== NULL
|| array_size
->has_sequence_subexpression()) {
2086 _mesa_glsl_error(& loc
, state
, "array size must be a "
2087 "constant valued expression");
2091 if (size
->value
.i
[0] <= 0) {
2092 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2096 assert(size
->type
== ir
->type
);
2098 /* If the array size is const (and we've verified that
2099 * it is) then no instructions should have been emitted
2100 * when we converted it to HIR. If they were emitted,
2101 * then either the array size isn't const after all, or
2102 * we are emitting unnecessary instructions.
2104 assert(dummy_instructions
.is_empty());
2106 return size
->value
.u
[0];
2109 static const glsl_type
*
2110 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2111 ast_array_specifier
*array_specifier
,
2112 struct _mesa_glsl_parse_state
*state
)
2114 const glsl_type
*array_type
= base
;
2116 if (array_specifier
!= NULL
) {
2117 if (base
->is_array()) {
2119 /* From page 19 (page 25) of the GLSL 1.20 spec:
2121 * "Only one-dimensional arrays may be declared."
2123 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2124 return glsl_type::error_type
;
2128 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2129 !node
->is_head_sentinel(); node
= node
->prev
) {
2130 unsigned array_size
= process_array_size(node
, state
);
2131 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2139 precision_qualifier_allowed(const glsl_type
*type
)
2141 /* Precision qualifiers apply to floating point, integer and opaque
2144 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2145 * "Any floating point or any integer declaration can have the type
2146 * preceded by one of these precision qualifiers [...] Literal
2147 * constants do not have precision qualifiers. Neither do Boolean
2150 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2153 * "Precision qualifiers are added for code portability with OpenGL
2154 * ES, not for functionality. They have the same syntax as in OpenGL
2157 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2159 * "uniform lowp sampler2D sampler;
2162 * lowp vec4 col = texture2D (sampler, coord);
2163 * // texture2D returns lowp"
2165 * From this, we infer that GLSL 1.30 (and later) should allow precision
2166 * qualifiers on sampler types just like float and integer types.
2168 return (type
->is_float()
2169 || type
->is_integer()
2170 || type
->contains_opaque())
2171 && !type
->without_array()->is_record();
2175 ast_type_specifier::glsl_type(const char **name
,
2176 struct _mesa_glsl_parse_state
*state
) const
2178 const struct glsl_type
*type
;
2180 type
= state
->symbols
->get_type(this->type_name
);
2181 *name
= this->type_name
;
2183 YYLTYPE loc
= this->get_location();
2184 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2190 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2192 * "The precision statement
2194 * precision precision-qualifier type;
2196 * can be used to establish a default precision qualifier. The type field can
2197 * be either int or float or any of the sampler types, (...) If type is float,
2198 * the directive applies to non-precision-qualified floating point type
2199 * (scalar, vector, and matrix) declarations. If type is int, the directive
2200 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2201 * and unsigned) declarations."
2203 * We use the symbol table to keep the values of the default precisions for
2204 * each 'type' in each scope and we use the 'type' string from the precision
2205 * statement as key in the symbol table. When we want to retrieve the default
2206 * precision associated with a given glsl_type we need to know the type string
2207 * associated with it. This is what this function returns.
2210 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2212 switch (type
->base_type
) {
2213 case GLSL_TYPE_FLOAT
:
2215 case GLSL_TYPE_UINT
:
2218 case GLSL_TYPE_ATOMIC_UINT
:
2219 return "atomic_uint";
2220 case GLSL_TYPE_IMAGE
:
2222 case GLSL_TYPE_SAMPLER
: {
2223 const unsigned type_idx
=
2224 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2225 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2226 assert(type_idx
< 4);
2227 switch (type
->sampler_type
) {
2228 case GLSL_TYPE_FLOAT
:
2229 switch (type
->sampler_dimensionality
) {
2230 case GLSL_SAMPLER_DIM_1D
: {
2231 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2232 static const char *const names
[4] = {
2233 "sampler1D", "sampler1DArray",
2234 "sampler1DShadow", "sampler1DArrayShadow"
2236 return names
[type_idx
];
2238 case GLSL_SAMPLER_DIM_2D
: {
2239 static const char *const names
[8] = {
2240 "sampler2D", "sampler2DArray",
2241 "sampler2DShadow", "sampler2DArrayShadow",
2242 "image2D", "image2DArray", NULL
, NULL
2244 return names
[offset
+ type_idx
];
2246 case GLSL_SAMPLER_DIM_3D
: {
2247 static const char *const names
[8] = {
2248 "sampler3D", NULL
, NULL
, NULL
,
2249 "image3D", NULL
, NULL
, NULL
2251 return names
[offset
+ type_idx
];
2253 case GLSL_SAMPLER_DIM_CUBE
: {
2254 static const char *const names
[8] = {
2255 "samplerCube", "samplerCubeArray",
2256 "samplerCubeShadow", "samplerCubeArrayShadow",
2257 "imageCube", NULL
, NULL
, NULL
2259 return names
[offset
+ type_idx
];
2261 case GLSL_SAMPLER_DIM_MS
: {
2262 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2263 static const char *const names
[4] = {
2264 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2266 return names
[type_idx
];
2268 case GLSL_SAMPLER_DIM_RECT
: {
2269 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2270 static const char *const names
[4] = {
2271 "samplerRect", NULL
, "samplerRectShadow", NULL
2273 return names
[type_idx
];
2275 case GLSL_SAMPLER_DIM_BUF
: {
2276 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2277 static const char *const names
[4] = {
2278 "samplerBuffer", NULL
, NULL
, NULL
2280 return names
[type_idx
];
2282 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2283 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2284 static const char *const names
[4] = {
2285 "samplerExternalOES", NULL
, NULL
, NULL
2287 return names
[type_idx
];
2290 unreachable("Unsupported sampler/image dimensionality");
2291 } /* sampler/image float dimensionality */
2294 switch (type
->sampler_dimensionality
) {
2295 case GLSL_SAMPLER_DIM_1D
: {
2296 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2297 static const char *const names
[4] = {
2298 "isampler1D", "isampler1DArray", NULL
, NULL
2300 return names
[type_idx
];
2302 case GLSL_SAMPLER_DIM_2D
: {
2303 static const char *const names
[8] = {
2304 "isampler2D", "isampler2DArray", NULL
, NULL
,
2305 "iimage2D", "iimage2DArray", NULL
, NULL
2307 return names
[offset
+ type_idx
];
2309 case GLSL_SAMPLER_DIM_3D
: {
2310 static const char *const names
[8] = {
2311 "isampler3D", NULL
, NULL
, NULL
,
2312 "iimage3D", NULL
, NULL
, NULL
2314 return names
[offset
+ type_idx
];
2316 case GLSL_SAMPLER_DIM_CUBE
: {
2317 static const char *const names
[8] = {
2318 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2319 "iimageCube", NULL
, NULL
, NULL
2321 return names
[offset
+ type_idx
];
2323 case GLSL_SAMPLER_DIM_MS
: {
2324 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2325 static const char *const names
[4] = {
2326 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2328 return names
[type_idx
];
2330 case GLSL_SAMPLER_DIM_RECT
: {
2331 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2332 static const char *const names
[4] = {
2333 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2335 return names
[type_idx
];
2337 case GLSL_SAMPLER_DIM_BUF
: {
2338 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2339 static const char *const names
[4] = {
2340 "isamplerBuffer", NULL
, NULL
, NULL
2342 return names
[type_idx
];
2345 unreachable("Unsupported isampler/iimage dimensionality");
2346 } /* sampler/image int dimensionality */
2348 case GLSL_TYPE_UINT
:
2349 switch (type
->sampler_dimensionality
) {
2350 case GLSL_SAMPLER_DIM_1D
: {
2351 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2352 static const char *const names
[4] = {
2353 "usampler1D", "usampler1DArray", NULL
, NULL
2355 return names
[type_idx
];
2357 case GLSL_SAMPLER_DIM_2D
: {
2358 static const char *const names
[8] = {
2359 "usampler2D", "usampler2DArray", NULL
, NULL
,
2360 "uimage2D", "uimage2DArray", NULL
, NULL
2362 return names
[offset
+ type_idx
];
2364 case GLSL_SAMPLER_DIM_3D
: {
2365 static const char *const names
[8] = {
2366 "usampler3D", NULL
, NULL
, NULL
,
2367 "uimage3D", NULL
, NULL
, NULL
2369 return names
[offset
+ type_idx
];
2371 case GLSL_SAMPLER_DIM_CUBE
: {
2372 static const char *const names
[8] = {
2373 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2374 "uimageCube", NULL
, NULL
, NULL
2376 return names
[offset
+ type_idx
];
2378 case GLSL_SAMPLER_DIM_MS
: {
2379 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2380 static const char *const names
[4] = {
2381 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2383 return names
[type_idx
];
2385 case GLSL_SAMPLER_DIM_RECT
: {
2386 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2387 static const char *const names
[4] = {
2388 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2390 return names
[type_idx
];
2392 case GLSL_SAMPLER_DIM_BUF
: {
2393 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2394 static const char *const names
[4] = {
2395 "usamplerBuffer", NULL
, NULL
, NULL
2397 return names
[type_idx
];
2400 unreachable("Unsupported usampler/uimage dimensionality");
2401 } /* sampler/image uint dimensionality */
2404 unreachable("Unsupported sampler/image type");
2405 } /* sampler/image type */
2407 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2410 unreachable("Unsupported type");
2415 select_gles_precision(unsigned qual_precision
,
2416 const glsl_type
*type
,
2417 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2419 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2420 * In GLES we take the precision from the type qualifier if present,
2421 * otherwise, if the type of the variable allows precision qualifiers at
2422 * all, we look for the default precision qualifier for that type in the
2425 assert(state
->es_shader
);
2427 unsigned precision
= GLSL_PRECISION_NONE
;
2428 if (qual_precision
) {
2429 precision
= qual_precision
;
2430 } else if (precision_qualifier_allowed(type
)) {
2431 const char *type_name
=
2432 get_type_name_for_precision_qualifier(type
->without_array());
2433 assert(type_name
!= NULL
);
2436 state
->symbols
->get_default_precision_qualifier(type_name
);
2437 if (precision
== ast_precision_none
) {
2438 _mesa_glsl_error(loc
, state
,
2439 "No precision specified in this scope for type `%s'",
2447 ast_fully_specified_type::glsl_type(const char **name
,
2448 struct _mesa_glsl_parse_state
*state
) const
2450 return this->specifier
->glsl_type(name
, state
);
2454 * Determine whether a toplevel variable declaration declares a varying. This
2455 * function operates by examining the variable's mode and the shader target,
2456 * so it correctly identifies linkage variables regardless of whether they are
2457 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2459 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2460 * this function will produce undefined results.
2463 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2466 case MESA_SHADER_VERTEX
:
2467 return var
->data
.mode
== ir_var_shader_out
;
2468 case MESA_SHADER_FRAGMENT
:
2469 return var
->data
.mode
== ir_var_shader_in
;
2471 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2477 * Matrix layout qualifiers are only allowed on certain types
2480 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2482 const glsl_type
*type
,
2485 if (var
&& !var
->is_in_buffer_block()) {
2486 /* Layout qualifiers may only apply to interface blocks and fields in
2489 _mesa_glsl_error(loc
, state
,
2490 "uniform block layout qualifiers row_major and "
2491 "column_major may not be applied to variables "
2492 "outside of uniform blocks");
2493 } else if (!type
->without_array()->is_matrix()) {
2494 /* The OpenGL ES 3.0 conformance tests did not originally allow
2495 * matrix layout qualifiers on non-matrices. However, the OpenGL
2496 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2497 * amended to specifically allow these layouts on all types. Emit
2498 * a warning so that people know their code may not be portable.
2500 _mesa_glsl_warning(loc
, state
,
2501 "uniform block layout qualifiers row_major and "
2502 "column_major applied to non-matrix types may "
2503 "be rejected by older compilers");
2508 process_qualifier_constant(struct _mesa_glsl_parse_state
*state
,
2510 const char *qual_indentifier
,
2511 ast_expression
*const_expression
,
2514 exec_list dummy_instructions
;
2516 if (const_expression
== NULL
) {
2521 ir_rvalue
*const ir
= const_expression
->hir(&dummy_instructions
, state
);
2523 ir_constant
*const const_int
= ir
->constant_expression_value();
2524 if (const_int
== NULL
|| !const_int
->type
->is_integer()) {
2525 _mesa_glsl_error(loc
, state
, "%s must be an integral constant "
2526 "expression", qual_indentifier
);
2530 if (const_int
->value
.i
[0] < 0) {
2531 _mesa_glsl_error(loc
, state
, "%s layout qualifier is invalid (%d < 0)",
2532 qual_indentifier
, const_int
->value
.u
[0]);
2536 /* If the location is const (and we've verified that
2537 * it is) then no instructions should have been emitted
2538 * when we converted it to HIR. If they were emitted,
2539 * then either the location isn't const after all, or
2540 * we are emitting unnecessary instructions.
2542 assert(dummy_instructions
.is_empty());
2544 *value
= const_int
->value
.u
[0];
2549 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2552 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2553 _mesa_glsl_error(loc
, state
,
2554 "invalid stream specified %d is larger than "
2555 "MAX_VERTEX_STREAMS - 1 (%d).",
2556 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2564 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2567 const glsl_type
*type
,
2568 const ast_type_qualifier
*qual
)
2570 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2571 _mesa_glsl_error(loc
, state
,
2572 "the \"binding\" qualifier only applies to uniforms and "
2573 "shader storage buffer objects");
2577 unsigned qual_binding
;
2578 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2583 const struct gl_context
*const ctx
= state
->ctx
;
2584 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2585 unsigned max_index
= qual_binding
+ elements
- 1;
2586 const glsl_type
*base_type
= type
->without_array();
2588 if (base_type
->is_interface()) {
2589 /* UBOs. From page 60 of the GLSL 4.20 specification:
2590 * "If the binding point for any uniform block instance is less than zero,
2591 * or greater than or equal to the implementation-dependent maximum
2592 * number of uniform buffer bindings, a compilation error will occur.
2593 * When the binding identifier is used with a uniform block instanced as
2594 * an array of size N, all elements of the array from binding through
2595 * binding + N – 1 must be within this range."
2597 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2599 if (qual
->flags
.q
.uniform
&&
2600 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2601 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2602 "the maximum number of UBO binding points (%d)",
2603 qual_binding
, elements
,
2604 ctx
->Const
.MaxUniformBufferBindings
);
2608 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2609 * "If the binding point for any uniform or shader storage block instance
2610 * is less than zero, or greater than or equal to the
2611 * implementation-dependent maximum number of uniform buffer bindings, a
2612 * compile-time error will occur. When the binding identifier is used
2613 * with a uniform or shader storage block instanced as an array of size
2614 * N, all elements of the array from binding through binding + N – 1 must
2615 * be within this range."
2617 if (qual
->flags
.q
.buffer
&&
2618 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2619 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2620 "the maximum number of SSBO binding points (%d)",
2621 qual_binding
, elements
,
2622 ctx
->Const
.MaxShaderStorageBufferBindings
);
2625 } else if (base_type
->is_sampler()) {
2626 /* Samplers. From page 63 of the GLSL 4.20 specification:
2627 * "If the binding is less than zero, or greater than or equal to the
2628 * implementation-dependent maximum supported number of units, a
2629 * compilation error will occur. When the binding identifier is used
2630 * with an array of size N, all elements of the array from binding
2631 * through binding + N - 1 must be within this range."
2633 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2635 if (max_index
>= limit
) {
2636 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2637 "exceeds the maximum number of texture image units "
2638 "(%u)", qual_binding
, elements
, limit
);
2642 } else if (base_type
->contains_atomic()) {
2643 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2644 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2645 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2646 " maximum number of atomic counter buffer bindings"
2647 "(%u)", qual_binding
,
2648 ctx
->Const
.MaxAtomicBufferBindings
);
2652 } else if (state
->is_version(420, 310) && base_type
->is_image()) {
2653 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2654 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2655 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2656 " maximum number of image units (%d)", max_index
,
2657 ctx
->Const
.MaxImageUnits
);
2662 _mesa_glsl_error(loc
, state
,
2663 "the \"binding\" qualifier only applies to uniform "
2664 "blocks, opaque variables, or arrays thereof");
2668 var
->data
.explicit_binding
= true;
2669 var
->data
.binding
= qual_binding
;
2675 static glsl_interp_qualifier
2676 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2677 ir_variable_mode mode
,
2678 struct _mesa_glsl_parse_state
*state
,
2681 glsl_interp_qualifier interpolation
;
2682 if (qual
->flags
.q
.flat
)
2683 interpolation
= INTERP_QUALIFIER_FLAT
;
2684 else if (qual
->flags
.q
.noperspective
)
2685 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2686 else if (qual
->flags
.q
.smooth
)
2687 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2689 interpolation
= INTERP_QUALIFIER_NONE
;
2691 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2692 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2693 _mesa_glsl_error(loc
, state
,
2694 "interpolation qualifier `%s' can only be applied to "
2695 "shader inputs or outputs.",
2696 interpolation_string(interpolation
));
2700 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2701 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2702 _mesa_glsl_error(loc
, state
,
2703 "interpolation qualifier `%s' cannot be applied to "
2704 "vertex shader inputs or fragment shader outputs",
2705 interpolation_string(interpolation
));
2709 return interpolation
;
2714 apply_explicit_location(const struct ast_type_qualifier
*qual
,
2716 struct _mesa_glsl_parse_state
*state
,
2721 unsigned qual_location
;
2722 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
2727 /* Checks for GL_ARB_explicit_uniform_location. */
2728 if (qual
->flags
.q
.uniform
) {
2729 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2732 const struct gl_context
*const ctx
= state
->ctx
;
2733 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
2735 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2736 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2737 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2738 ctx
->Const
.MaxUserAssignableUniformLocations
);
2742 var
->data
.explicit_location
= true;
2743 var
->data
.location
= qual_location
;
2747 /* Between GL_ARB_explicit_attrib_location an
2748 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2749 * stage can be assigned explicit locations. The checking here associates
2750 * the correct extension with the correct stage's input / output:
2754 * vertex explicit_loc sso
2755 * tess control sso sso
2758 * fragment sso explicit_loc
2760 switch (state
->stage
) {
2761 case MESA_SHADER_VERTEX
:
2762 if (var
->data
.mode
== ir_var_shader_in
) {
2763 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2769 if (var
->data
.mode
== ir_var_shader_out
) {
2770 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2779 case MESA_SHADER_TESS_CTRL
:
2780 case MESA_SHADER_TESS_EVAL
:
2781 case MESA_SHADER_GEOMETRY
:
2782 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2783 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2792 case MESA_SHADER_FRAGMENT
:
2793 if (var
->data
.mode
== ir_var_shader_in
) {
2794 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2800 if (var
->data
.mode
== ir_var_shader_out
) {
2801 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2810 case MESA_SHADER_COMPUTE
:
2811 _mesa_glsl_error(loc
, state
,
2812 "compute shader variables cannot be given "
2813 "explicit locations");
2818 _mesa_glsl_error(loc
, state
,
2819 "%s cannot be given an explicit location in %s shader",
2821 _mesa_shader_stage_to_string(state
->stage
));
2823 var
->data
.explicit_location
= true;
2825 switch (state
->stage
) {
2826 case MESA_SHADER_VERTEX
:
2827 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2828 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
2829 : (qual_location
+ VARYING_SLOT_VAR0
);
2832 case MESA_SHADER_TESS_CTRL
:
2833 case MESA_SHADER_TESS_EVAL
:
2834 case MESA_SHADER_GEOMETRY
:
2835 if (var
->data
.patch
)
2836 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
2838 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
2841 case MESA_SHADER_FRAGMENT
:
2842 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2843 ? (qual_location
+ FRAG_RESULT_DATA0
)
2844 : (qual_location
+ VARYING_SLOT_VAR0
);
2846 case MESA_SHADER_COMPUTE
:
2847 assert(!"Unexpected shader type");
2851 /* Check if index was set for the uniform instead of the function */
2852 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
2853 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
2854 "used with subroutine functions");
2858 unsigned qual_index
;
2859 if (qual
->flags
.q
.explicit_index
&&
2860 process_qualifier_constant(state
, loc
, "index", qual
->index
,
2862 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2863 * Layout Qualifiers):
2865 * "It is also a compile-time error if a fragment shader
2866 * sets a layout index to less than 0 or greater than 1."
2868 * Older specifications don't mandate a behavior; we take
2869 * this as a clarification and always generate the error.
2871 if (qual_index
> 1) {
2872 _mesa_glsl_error(loc
, state
,
2873 "explicit index may only be 0 or 1");
2875 var
->data
.explicit_index
= true;
2876 var
->data
.index
= qual_index
;
2883 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2885 struct _mesa_glsl_parse_state
*state
,
2888 const glsl_type
*base_type
= var
->type
->without_array();
2890 if (base_type
->is_image()) {
2891 if (var
->data
.mode
!= ir_var_uniform
&&
2892 var
->data
.mode
!= ir_var_function_in
) {
2893 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2894 "function parameters or uniform-qualified "
2895 "global variables");
2898 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2899 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2900 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2901 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2902 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2903 var
->data
.read_only
= true;
2905 if (qual
->flags
.q
.explicit_image_format
) {
2906 if (var
->data
.mode
== ir_var_function_in
) {
2907 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2908 "used on image function parameters");
2911 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2912 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2913 "base data type of the image");
2916 var
->data
.image_format
= qual
->image_format
;
2918 if (var
->data
.mode
== ir_var_uniform
) {
2919 if (state
->es_shader
) {
2920 _mesa_glsl_error(loc
, state
, "all image uniforms "
2921 "must have a format layout qualifier");
2923 } else if (!qual
->flags
.q
.write_only
) {
2924 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
2925 "`writeonly' must have a format layout "
2930 var
->data
.image_format
= GL_NONE
;
2933 /* From page 70 of the GLSL ES 3.1 specification:
2935 * "Except for image variables qualified with the format qualifiers
2936 * r32f, r32i, and r32ui, image variables must specify either memory
2937 * qualifier readonly or the memory qualifier writeonly."
2939 if (state
->es_shader
&&
2940 var
->data
.image_format
!= GL_R32F
&&
2941 var
->data
.image_format
!= GL_R32I
&&
2942 var
->data
.image_format
!= GL_R32UI
&&
2943 !var
->data
.image_read_only
&&
2944 !var
->data
.image_write_only
) {
2945 _mesa_glsl_error(loc
, state
, "image variables of format other than "
2946 "r32f, r32i or r32ui must be qualified `readonly' or "
2950 } else if (qual
->flags
.q
.read_only
||
2951 qual
->flags
.q
.write_only
||
2952 qual
->flags
.q
.coherent
||
2953 qual
->flags
.q
._volatile
||
2954 qual
->flags
.q
.restrict_flag
||
2955 qual
->flags
.q
.explicit_image_format
) {
2956 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
2961 static inline const char*
2962 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
2964 if (origin_upper_left
&& pixel_center_integer
)
2965 return "origin_upper_left, pixel_center_integer";
2966 else if (origin_upper_left
)
2967 return "origin_upper_left";
2968 else if (pixel_center_integer
)
2969 return "pixel_center_integer";
2975 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
2976 const struct ast_type_qualifier
*qual
)
2978 /* If gl_FragCoord was previously declared, and the qualifiers were
2979 * different in any way, return true.
2981 if (state
->fs_redeclares_gl_fragcoord
) {
2982 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
2983 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
2990 validate_array_dimensions(const glsl_type
*t
,
2991 struct _mesa_glsl_parse_state
*state
,
2993 if (t
->is_array()) {
2994 t
= t
->fields
.array
;
2995 while (t
->is_array()) {
2996 if (t
->is_unsized_array()) {
2997 _mesa_glsl_error(loc
, state
,
2998 "only the outermost array dimension can "
3003 t
= t
->fields
.array
;
3009 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3011 struct _mesa_glsl_parse_state
*state
,
3014 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3016 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3018 * "Within any shader, the first redeclarations of gl_FragCoord
3019 * must appear before any use of gl_FragCoord."
3021 * Generate a compiler error if above condition is not met by the
3024 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3025 if (earlier
!= NULL
&&
3026 earlier
->data
.used
&&
3027 !state
->fs_redeclares_gl_fragcoord
) {
3028 _mesa_glsl_error(loc
, state
,
3029 "gl_FragCoord used before its first redeclaration "
3030 "in fragment shader");
3033 /* Make sure all gl_FragCoord redeclarations specify the same layout
3036 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3037 const char *const qual_string
=
3038 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3039 qual
->flags
.q
.pixel_center_integer
);
3041 const char *const state_string
=
3042 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3043 state
->fs_pixel_center_integer
);
3045 _mesa_glsl_error(loc
, state
,
3046 "gl_FragCoord redeclared with different layout "
3047 "qualifiers (%s) and (%s) ",
3051 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3052 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3053 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3054 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3055 state
->fs_redeclares_gl_fragcoord
=
3056 state
->fs_origin_upper_left
||
3057 state
->fs_pixel_center_integer
||
3058 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3061 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3062 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3063 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3064 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3065 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3066 ? "origin_upper_left" : "pixel_center_integer";
3068 _mesa_glsl_error(loc
, state
,
3069 "layout qualifier `%s' can only be applied to "
3070 "fragment shader input `gl_FragCoord'",
3074 if (qual
->flags
.q
.explicit_location
) {
3075 apply_explicit_location(qual
, var
, state
, loc
);
3076 } else if (qual
->flags
.q
.explicit_index
) {
3077 if (!qual
->flags
.q
.subroutine_def
)
3078 _mesa_glsl_error(loc
, state
,
3079 "explicit index requires explicit location");
3082 if (qual
->flags
.q
.explicit_binding
) {
3083 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3086 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3087 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3088 unsigned qual_stream
;
3089 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3091 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3092 var
->data
.stream
= qual_stream
;
3096 if (var
->type
->contains_atomic()) {
3097 if (var
->data
.mode
== ir_var_uniform
) {
3098 if (var
->data
.explicit_binding
) {
3100 &state
->atomic_counter_offsets
[var
->data
.binding
];
3102 if (*offset
% ATOMIC_COUNTER_SIZE
)
3103 _mesa_glsl_error(loc
, state
,
3104 "misaligned atomic counter offset");
3106 var
->data
.atomic
.offset
= *offset
;
3107 *offset
+= var
->type
->atomic_size();
3110 _mesa_glsl_error(loc
, state
,
3111 "atomic counters require explicit binding point");
3113 } else if (var
->data
.mode
!= ir_var_function_in
) {
3114 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3115 "function parameters or uniform-qualified "
3116 "global variables");
3120 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3121 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3122 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3123 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3124 * These extensions and all following extensions that add the 'layout'
3125 * keyword have been modified to require the use of 'in' or 'out'.
3127 * The following extension do not allow the deprecated keywords:
3129 * GL_AMD_conservative_depth
3130 * GL_ARB_conservative_depth
3131 * GL_ARB_gpu_shader5
3132 * GL_ARB_separate_shader_objects
3133 * GL_ARB_tessellation_shader
3134 * GL_ARB_transform_feedback3
3135 * GL_ARB_uniform_buffer_object
3137 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3138 * allow layout with the deprecated keywords.
3140 const bool relaxed_layout_qualifier_checking
=
3141 state
->ARB_fragment_coord_conventions_enable
;
3143 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3144 || qual
->flags
.q
.varying
;
3145 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3146 if (relaxed_layout_qualifier_checking
) {
3147 _mesa_glsl_warning(loc
, state
,
3148 "`layout' qualifier may not be used with "
3149 "`attribute' or `varying'");
3151 _mesa_glsl_error(loc
, state
,
3152 "`layout' qualifier may not be used with "
3153 "`attribute' or `varying'");
3157 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3158 * AMD_conservative_depth.
3160 int depth_layout_count
= qual
->flags
.q
.depth_any
3161 + qual
->flags
.q
.depth_greater
3162 + qual
->flags
.q
.depth_less
3163 + qual
->flags
.q
.depth_unchanged
;
3164 if (depth_layout_count
> 0
3165 && !state
->AMD_conservative_depth_enable
3166 && !state
->ARB_conservative_depth_enable
) {
3167 _mesa_glsl_error(loc
, state
,
3168 "extension GL_AMD_conservative_depth or "
3169 "GL_ARB_conservative_depth must be enabled "
3170 "to use depth layout qualifiers");
3171 } else if (depth_layout_count
> 0
3172 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3173 _mesa_glsl_error(loc
, state
,
3174 "depth layout qualifiers can be applied only to "
3176 } else if (depth_layout_count
> 1
3177 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3178 _mesa_glsl_error(loc
, state
,
3179 "at most one depth layout qualifier can be applied to "
3182 if (qual
->flags
.q
.depth_any
)
3183 var
->data
.depth_layout
= ir_depth_layout_any
;
3184 else if (qual
->flags
.q
.depth_greater
)
3185 var
->data
.depth_layout
= ir_depth_layout_greater
;
3186 else if (qual
->flags
.q
.depth_less
)
3187 var
->data
.depth_layout
= ir_depth_layout_less
;
3188 else if (qual
->flags
.q
.depth_unchanged
)
3189 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3191 var
->data
.depth_layout
= ir_depth_layout_none
;
3193 if (qual
->flags
.q
.std140
||
3194 qual
->flags
.q
.std430
||
3195 qual
->flags
.q
.packed
||
3196 qual
->flags
.q
.shared
) {
3197 _mesa_glsl_error(loc
, state
,
3198 "uniform and shader storage block layout qualifiers "
3199 "std140, std430, packed, and shared can only be "
3200 "applied to uniform or shader storage blocks, not "
3204 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3205 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3208 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3211 * "Fragment shaders also allow the following layout qualifier on in only
3212 * (not with variable declarations)
3213 * layout-qualifier-id
3214 * early_fragment_tests
3217 if (qual
->flags
.q
.early_fragment_tests
) {
3218 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3219 "valid in fragment shader input layout declaration.");
3224 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3226 struct _mesa_glsl_parse_state
*state
,
3230 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3232 if (qual
->flags
.q
.invariant
) {
3233 if (var
->data
.used
) {
3234 _mesa_glsl_error(loc
, state
,
3235 "variable `%s' may not be redeclared "
3236 "`invariant' after being used",
3239 var
->data
.invariant
= 1;
3243 if (qual
->flags
.q
.precise
) {
3244 if (var
->data
.used
) {
3245 _mesa_glsl_error(loc
, state
,
3246 "variable `%s' may not be redeclared "
3247 "`precise' after being used",
3250 var
->data
.precise
= 1;
3254 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3255 _mesa_glsl_error(loc
, state
,
3256 "`subroutine' may only be applied to uniforms, "
3257 "subroutine type declarations, or function definitions");
3260 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3261 || qual
->flags
.q
.uniform
3262 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3263 var
->data
.read_only
= 1;
3265 if (qual
->flags
.q
.centroid
)
3266 var
->data
.centroid
= 1;
3268 if (qual
->flags
.q
.sample
)
3269 var
->data
.sample
= 1;
3271 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3272 if (state
->es_shader
) {
3273 var
->data
.precision
=
3274 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3277 if (qual
->flags
.q
.patch
)
3278 var
->data
.patch
= 1;
3280 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3281 var
->type
= glsl_type::error_type
;
3282 _mesa_glsl_error(loc
, state
,
3283 "`attribute' variables may not be declared in the "
3285 _mesa_shader_stage_to_string(state
->stage
));
3288 /* Disallow layout qualifiers which may only appear on layout declarations. */
3289 if (qual
->flags
.q
.prim_type
) {
3290 _mesa_glsl_error(loc
, state
,
3291 "Primitive type may only be specified on GS input or output "
3292 "layout declaration, not on variables.");
3295 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3297 * "However, the const qualifier cannot be used with out or inout."
3299 * The same section of the GLSL 4.40 spec further clarifies this saying:
3301 * "The const qualifier cannot be used with out or inout, or a
3302 * compile-time error results."
3304 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3305 _mesa_glsl_error(loc
, state
,
3306 "`const' may not be applied to `out' or `inout' "
3307 "function parameters");
3310 /* If there is no qualifier that changes the mode of the variable, leave
3311 * the setting alone.
3313 assert(var
->data
.mode
!= ir_var_temporary
);
3314 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3315 var
->data
.mode
= ir_var_function_inout
;
3316 else if (qual
->flags
.q
.in
)
3317 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3318 else if (qual
->flags
.q
.attribute
3319 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3320 var
->data
.mode
= ir_var_shader_in
;
3321 else if (qual
->flags
.q
.out
)
3322 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3323 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3324 var
->data
.mode
= ir_var_shader_out
;
3325 else if (qual
->flags
.q
.uniform
)
3326 var
->data
.mode
= ir_var_uniform
;
3327 else if (qual
->flags
.q
.buffer
)
3328 var
->data
.mode
= ir_var_shader_storage
;
3329 else if (qual
->flags
.q
.shared_storage
)
3330 var
->data
.mode
= ir_var_shader_shared
;
3332 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3333 /* User-defined ins/outs are not permitted in compute shaders. */
3334 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3335 _mesa_glsl_error(loc
, state
,
3336 "user-defined input and output variables are not "
3337 "permitted in compute shaders");
3340 /* This variable is being used to link data between shader stages (in
3341 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3342 * that is allowed for such purposes.
3344 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3346 * "The varying qualifier can be used only with the data types
3347 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3350 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3351 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3353 * "Fragment inputs can only be signed and unsigned integers and
3354 * integer vectors, float, floating-point vectors, matrices, or
3355 * arrays of these. Structures cannot be input.
3357 * Similar text exists in the section on vertex shader outputs.
3359 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3360 * 3.00 spec allows structs as well. Varying structs are also allowed
3363 switch (var
->type
->get_scalar_type()->base_type
) {
3364 case GLSL_TYPE_FLOAT
:
3365 /* Ok in all GLSL versions */
3367 case GLSL_TYPE_UINT
:
3369 if (state
->is_version(130, 300))
3371 _mesa_glsl_error(loc
, state
,
3372 "varying variables must be of base type float in %s",
3373 state
->get_version_string());
3375 case GLSL_TYPE_STRUCT
:
3376 if (state
->is_version(150, 300))
3378 _mesa_glsl_error(loc
, state
,
3379 "varying variables may not be of type struct");
3381 case GLSL_TYPE_DOUBLE
:
3384 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3389 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3390 switch (state
->stage
) {
3391 case MESA_SHADER_VERTEX
:
3392 if (var
->data
.mode
== ir_var_shader_out
)
3393 var
->data
.invariant
= true;
3395 case MESA_SHADER_TESS_CTRL
:
3396 case MESA_SHADER_TESS_EVAL
:
3397 case MESA_SHADER_GEOMETRY
:
3398 if ((var
->data
.mode
== ir_var_shader_in
)
3399 || (var
->data
.mode
== ir_var_shader_out
))
3400 var
->data
.invariant
= true;
3402 case MESA_SHADER_FRAGMENT
:
3403 if (var
->data
.mode
== ir_var_shader_in
)
3404 var
->data
.invariant
= true;
3406 case MESA_SHADER_COMPUTE
:
3407 /* Invariance isn't meaningful in compute shaders. */
3412 var
->data
.interpolation
=
3413 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
3416 /* Does the declaration use the deprecated 'attribute' or 'varying'
3419 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3420 || qual
->flags
.q
.varying
;
3423 /* Validate auxiliary storage qualifiers */
3425 /* From section 4.3.4 of the GLSL 1.30 spec:
3426 * "It is an error to use centroid in in a vertex shader."
3428 * From section 4.3.4 of the GLSL ES 3.00 spec:
3429 * "It is an error to use centroid in or interpolation qualifiers in
3430 * a vertex shader input."
3433 /* Section 4.3.6 of the GLSL 1.30 specification states:
3434 * "It is an error to use centroid out in a fragment shader."
3436 * The GL_ARB_shading_language_420pack extension specification states:
3437 * "It is an error to use auxiliary storage qualifiers or interpolation
3438 * qualifiers on an output in a fragment shader."
3440 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3441 _mesa_glsl_error(loc
, state
,
3442 "sample qualifier may only be used on `in` or `out` "
3443 "variables between shader stages");
3445 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3446 _mesa_glsl_error(loc
, state
,
3447 "centroid qualifier may only be used with `in', "
3448 "`out' or `varying' variables between shader stages");
3451 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3452 _mesa_glsl_error(loc
, state
,
3453 "the shared storage qualifiers can only be used with "
3457 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3461 * Get the variable that is being redeclared by this declaration
3463 * Semantic checks to verify the validity of the redeclaration are also
3464 * performed. If semantic checks fail, compilation error will be emitted via
3465 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3468 * A pointer to an existing variable in the current scope if the declaration
3469 * is a redeclaration, \c NULL otherwise.
3471 static ir_variable
*
3472 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3473 struct _mesa_glsl_parse_state
*state
,
3474 bool allow_all_redeclarations
)
3476 /* Check if this declaration is actually a re-declaration, either to
3477 * resize an array or add qualifiers to an existing variable.
3479 * This is allowed for variables in the current scope, or when at
3480 * global scope (for built-ins in the implicit outer scope).
3482 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3483 if (earlier
== NULL
||
3484 (state
->current_function
!= NULL
&&
3485 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3490 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3492 * "It is legal to declare an array without a size and then
3493 * later re-declare the same name as an array of the same
3494 * type and specify a size."
3496 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3497 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3498 /* FINISHME: This doesn't match the qualifiers on the two
3499 * FINISHME: declarations. It's not 100% clear whether this is
3500 * FINISHME: required or not.
3503 const unsigned size
= unsigned(var
->type
->array_size());
3504 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3505 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3506 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3508 earlier
->data
.max_array_access
);
3511 earlier
->type
= var
->type
;
3514 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3515 state
->is_version(150, 0))
3516 && strcmp(var
->name
, "gl_FragCoord") == 0
3517 && earlier
->type
== var
->type
3518 && earlier
->data
.mode
== var
->data
.mode
) {
3519 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3522 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3523 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3525 /* According to section 4.3.7 of the GLSL 1.30 spec,
3526 * the following built-in varaibles can be redeclared with an
3527 * interpolation qualifier:
3530 * * gl_FrontSecondaryColor
3531 * * gl_BackSecondaryColor
3533 * * gl_SecondaryColor
3535 } else if (state
->is_version(130, 0)
3536 && (strcmp(var
->name
, "gl_FrontColor") == 0
3537 || strcmp(var
->name
, "gl_BackColor") == 0
3538 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3539 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3540 || strcmp(var
->name
, "gl_Color") == 0
3541 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3542 && earlier
->type
== var
->type
3543 && earlier
->data
.mode
== var
->data
.mode
) {
3544 earlier
->data
.interpolation
= var
->data
.interpolation
;
3546 /* Layout qualifiers for gl_FragDepth. */
3547 } else if ((state
->AMD_conservative_depth_enable
||
3548 state
->ARB_conservative_depth_enable
)
3549 && strcmp(var
->name
, "gl_FragDepth") == 0
3550 && earlier
->type
== var
->type
3551 && earlier
->data
.mode
== var
->data
.mode
) {
3553 /** From the AMD_conservative_depth spec:
3554 * Within any shader, the first redeclarations of gl_FragDepth
3555 * must appear before any use of gl_FragDepth.
3557 if (earlier
->data
.used
) {
3558 _mesa_glsl_error(&loc
, state
,
3559 "the first redeclaration of gl_FragDepth "
3560 "must appear before any use of gl_FragDepth");
3563 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3564 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3565 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3566 _mesa_glsl_error(&loc
, state
,
3567 "gl_FragDepth: depth layout is declared here "
3568 "as '%s, but it was previously declared as "
3570 depth_layout_string(var
->data
.depth_layout
),
3571 depth_layout_string(earlier
->data
.depth_layout
));
3574 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3576 } else if (allow_all_redeclarations
) {
3577 if (earlier
->data
.mode
!= var
->data
.mode
) {
3578 _mesa_glsl_error(&loc
, state
,
3579 "redeclaration of `%s' with incorrect qualifiers",
3581 } else if (earlier
->type
!= var
->type
) {
3582 _mesa_glsl_error(&loc
, state
,
3583 "redeclaration of `%s' has incorrect type",
3587 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3594 * Generate the IR for an initializer in a variable declaration
3597 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3598 ast_fully_specified_type
*type
,
3599 exec_list
*initializer_instructions
,
3600 struct _mesa_glsl_parse_state
*state
)
3602 ir_rvalue
*result
= NULL
;
3604 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3606 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3608 * "All uniform variables are read-only and are initialized either
3609 * directly by an application via API commands, or indirectly by
3612 if (var
->data
.mode
== ir_var_uniform
) {
3613 state
->check_version(120, 0, &initializer_loc
,
3614 "cannot initialize uniform %s",
3618 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3620 * "Buffer variables cannot have initializers."
3622 if (var
->data
.mode
== ir_var_shader_storage
) {
3623 _mesa_glsl_error(&initializer_loc
, state
,
3624 "cannot initialize buffer variable %s",
3628 /* From section 4.1.7 of the GLSL 4.40 spec:
3630 * "Opaque variables [...] are initialized only through the
3631 * OpenGL API; they cannot be declared with an initializer in a
3634 if (var
->type
->contains_opaque()) {
3635 _mesa_glsl_error(&initializer_loc
, state
,
3636 "cannot initialize opaque variable %s",
3640 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3641 _mesa_glsl_error(&initializer_loc
, state
,
3642 "cannot initialize %s shader input / %s %s",
3643 _mesa_shader_stage_to_string(state
->stage
),
3644 (state
->stage
== MESA_SHADER_VERTEX
)
3645 ? "attribute" : "varying",
3649 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
3650 _mesa_glsl_error(&initializer_loc
, state
,
3651 "cannot initialize %s shader output %s",
3652 _mesa_shader_stage_to_string(state
->stage
),
3656 /* If the initializer is an ast_aggregate_initializer, recursively store
3657 * type information from the LHS into it, so that its hir() function can do
3660 if (decl
->initializer
->oper
== ast_aggregate
)
3661 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3663 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3664 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3666 /* Calculate the constant value if this is a const or uniform
3669 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
3671 * "Declarations of globals without a storage qualifier, or with
3672 * just the const qualifier, may include initializers, in which case
3673 * they will be initialized before the first line of main() is
3674 * executed. Such initializers must be a constant expression."
3676 * The same section of the GLSL ES 3.00.4 spec has similar language.
3678 if (type
->qualifier
.flags
.q
.constant
3679 || type
->qualifier
.flags
.q
.uniform
3680 || (state
->es_shader
&& state
->current_function
== NULL
)) {
3681 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3683 if (new_rhs
!= NULL
) {
3686 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
3689 * "A constant expression is one of
3693 * - an expression formed by an operator on operands that are
3694 * all constant expressions, including getting an element of
3695 * a constant array, or a field of a constant structure, or
3696 * components of a constant vector. However, the sequence
3697 * operator ( , ) and the assignment operators ( =, +=, ...)
3698 * are not included in the operators that can create a
3699 * constant expression."
3701 * Section 12.43 (Sequence operator and constant expressions) says:
3703 * "Should the following construct be allowed?
3707 * The expression within the brackets uses the sequence operator
3708 * (',') and returns the integer 3 so the construct is declaring
3709 * a single-dimensional array of size 3. In some languages, the
3710 * construct declares a two-dimensional array. It would be
3711 * preferable to make this construct illegal to avoid confusion.
3713 * One possibility is to change the definition of the sequence
3714 * operator so that it does not return a constant-expression and
3715 * hence cannot be used to declare an array size.
3717 * RESOLUTION: The result of a sequence operator is not a
3718 * constant-expression."
3720 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
3721 * contains language almost identical to the section 4.3.3 in the
3722 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
3725 ir_constant
*constant_value
= rhs
->constant_expression_value();
3726 if (!constant_value
||
3727 (state
->is_version(430, 300) &&
3728 decl
->initializer
->has_sequence_subexpression())) {
3729 const char *const variable_mode
=
3730 (type
->qualifier
.flags
.q
.constant
)
3732 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
3734 /* If ARB_shading_language_420pack is enabled, initializers of
3735 * const-qualified local variables do not have to be constant
3736 * expressions. Const-qualified global variables must still be
3737 * initialized with constant expressions.
3739 if (!state
->ARB_shading_language_420pack_enable
3740 || state
->current_function
== NULL
) {
3741 _mesa_glsl_error(& initializer_loc
, state
,
3742 "initializer of %s variable `%s' must be a "
3743 "constant expression",
3746 if (var
->type
->is_numeric()) {
3747 /* Reduce cascading errors. */
3748 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3749 ? ir_constant::zero(state
, var
->type
) : NULL
;
3753 rhs
= constant_value
;
3754 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3755 ? constant_value
: NULL
;
3758 if (var
->type
->is_numeric()) {
3759 /* Reduce cascading errors. */
3760 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3761 ? ir_constant::zero(state
, var
->type
) : NULL
;
3766 if (rhs
&& !rhs
->type
->is_error()) {
3767 bool temp
= var
->data
.read_only
;
3768 if (type
->qualifier
.flags
.q
.constant
)
3769 var
->data
.read_only
= false;
3771 /* Never emit code to initialize a uniform.
3773 const glsl_type
*initializer_type
;
3774 if (!type
->qualifier
.flags
.q
.uniform
) {
3775 do_assignment(initializer_instructions
, state
,
3780 type
->get_location());
3781 initializer_type
= result
->type
;
3783 initializer_type
= rhs
->type
;
3785 var
->constant_initializer
= rhs
->constant_expression_value();
3786 var
->data
.has_initializer
= true;
3788 /* If the declared variable is an unsized array, it must inherrit
3789 * its full type from the initializer. A declaration such as
3791 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3795 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3797 * The assignment generated in the if-statement (below) will also
3798 * automatically handle this case for non-uniforms.
3800 * If the declared variable is not an array, the types must
3801 * already match exactly. As a result, the type assignment
3802 * here can be done unconditionally. For non-uniforms the call
3803 * to do_assignment can change the type of the initializer (via
3804 * the implicit conversion rules). For uniforms the initializer
3805 * must be a constant expression, and the type of that expression
3806 * was validated above.
3808 var
->type
= initializer_type
;
3810 var
->data
.read_only
= temp
;
3817 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3818 YYLTYPE loc
, ir_variable
*var
,
3819 unsigned num_vertices
,
3821 const char *var_category
)
3823 if (var
->type
->is_unsized_array()) {
3824 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3826 * All geometry shader input unsized array declarations will be
3827 * sized by an earlier input layout qualifier, when present, as per
3828 * the following table.
3830 * Followed by a table mapping each allowed input layout qualifier to
3831 * the corresponding input length.
3833 * Similarly for tessellation control shader outputs.
3835 if (num_vertices
!= 0)
3836 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3839 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3840 * includes the following examples of compile-time errors:
3842 * // code sequence within one shader...
3843 * in vec4 Color1[]; // size unknown
3844 * ...Color1.length()...// illegal, length() unknown
3845 * in vec4 Color2[2]; // size is 2
3846 * ...Color1.length()...// illegal, Color1 still has no size
3847 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3848 * layout(lines) in; // legal, input size is 2, matching
3849 * in vec4 Color4[3]; // illegal, contradicts layout
3852 * To detect the case illustrated by Color3, we verify that the size of
3853 * an explicitly-sized array matches the size of any previously declared
3854 * explicitly-sized array. To detect the case illustrated by Color4, we
3855 * verify that the size of an explicitly-sized array is consistent with
3856 * any previously declared input layout.
3858 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3859 _mesa_glsl_error(&loc
, state
,
3860 "%s size contradicts previously declared layout "
3861 "(size is %u, but layout requires a size of %u)",
3862 var_category
, var
->type
->length
, num_vertices
);
3863 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3864 _mesa_glsl_error(&loc
, state
,
3865 "%s sizes are inconsistent (size is %u, but a "
3866 "previous declaration has size %u)",
3867 var_category
, var
->type
->length
, *size
);
3869 *size
= var
->type
->length
;
3875 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3876 YYLTYPE loc
, ir_variable
*var
)
3878 unsigned num_vertices
= 0;
3880 if (state
->tcs_output_vertices_specified
) {
3881 if (!state
->out_qualifier
->vertices
->
3882 process_qualifier_constant(state
, "vertices",
3883 &num_vertices
, false)) {
3887 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
3888 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
3889 "GL_MAX_PATCH_VERTICES", num_vertices
);
3894 if (!var
->type
->is_array() && !var
->data
.patch
) {
3895 _mesa_glsl_error(&loc
, state
,
3896 "tessellation control shader outputs must be arrays");
3898 /* To avoid cascading failures, short circuit the checks below. */
3902 if (var
->data
.patch
)
3905 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3906 &state
->tcs_output_size
,
3907 "tessellation control shader output");
3911 * Do additional processing necessary for tessellation control/evaluation shader
3912 * input declarations. This covers both interface block arrays and bare input
3916 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3917 YYLTYPE loc
, ir_variable
*var
)
3919 if (!var
->type
->is_array() && !var
->data
.patch
) {
3920 _mesa_glsl_error(&loc
, state
,
3921 "per-vertex tessellation shader inputs must be arrays");
3922 /* Avoid cascading failures. */
3926 if (var
->data
.patch
)
3929 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
3930 if (var
->type
->is_unsized_array()) {
3931 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3932 state
->Const
.MaxPatchVertices
);
3938 * Do additional processing necessary for geometry shader input declarations
3939 * (this covers both interface blocks arrays and bare input variables).
3942 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3943 YYLTYPE loc
, ir_variable
*var
)
3945 unsigned num_vertices
= 0;
3947 if (state
->gs_input_prim_type_specified
) {
3948 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
3951 /* Geometry shader input variables must be arrays. Caller should have
3952 * reported an error for this.
3954 if (!var
->type
->is_array()) {
3955 assert(state
->error
);
3957 /* To avoid cascading failures, short circuit the checks below. */
3961 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3962 &state
->gs_input_size
,
3963 "geometry shader input");
3967 validate_identifier(const char *identifier
, YYLTYPE loc
,
3968 struct _mesa_glsl_parse_state
*state
)
3970 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3972 * "Identifiers starting with "gl_" are reserved for use by
3973 * OpenGL, and may not be declared in a shader as either a
3974 * variable or a function."
3976 if (is_gl_identifier(identifier
)) {
3977 _mesa_glsl_error(&loc
, state
,
3978 "identifier `%s' uses reserved `gl_' prefix",
3980 } else if (strstr(identifier
, "__")) {
3981 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3984 * "In addition, all identifiers containing two
3985 * consecutive underscores (__) are reserved as
3986 * possible future keywords."
3988 * The intention is that names containing __ are reserved for internal
3989 * use by the implementation, and names prefixed with GL_ are reserved
3990 * for use by Khronos. Names simply containing __ are dangerous to use,
3991 * but should be allowed.
3993 * A future version of the GLSL specification will clarify this.
3995 _mesa_glsl_warning(&loc
, state
,
3996 "identifier `%s' uses reserved `__' string",
4002 ast_declarator_list::hir(exec_list
*instructions
,
4003 struct _mesa_glsl_parse_state
*state
)
4006 const struct glsl_type
*decl_type
;
4007 const char *type_name
= NULL
;
4008 ir_rvalue
*result
= NULL
;
4009 YYLTYPE loc
= this->get_location();
4011 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4013 * "To ensure that a particular output variable is invariant, it is
4014 * necessary to use the invariant qualifier. It can either be used to
4015 * qualify a previously declared variable as being invariant
4017 * invariant gl_Position; // make existing gl_Position be invariant"
4019 * In these cases the parser will set the 'invariant' flag in the declarator
4020 * list, and the type will be NULL.
4022 if (this->invariant
) {
4023 assert(this->type
== NULL
);
4025 if (state
->current_function
!= NULL
) {
4026 _mesa_glsl_error(& loc
, state
,
4027 "all uses of `invariant' keyword must be at global "
4031 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4032 assert(decl
->array_specifier
== NULL
);
4033 assert(decl
->initializer
== NULL
);
4035 ir_variable
*const earlier
=
4036 state
->symbols
->get_variable(decl
->identifier
);
4037 if (earlier
== NULL
) {
4038 _mesa_glsl_error(& loc
, state
,
4039 "undeclared variable `%s' cannot be marked "
4040 "invariant", decl
->identifier
);
4041 } else if (!is_varying_var(earlier
, state
->stage
)) {
4042 _mesa_glsl_error(&loc
, state
,
4043 "`%s' cannot be marked invariant; interfaces between "
4044 "shader stages only.", decl
->identifier
);
4045 } else if (earlier
->data
.used
) {
4046 _mesa_glsl_error(& loc
, state
,
4047 "variable `%s' may not be redeclared "
4048 "`invariant' after being used",
4051 earlier
->data
.invariant
= true;
4055 /* Invariant redeclarations do not have r-values.
4060 if (this->precise
) {
4061 assert(this->type
== NULL
);
4063 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4064 assert(decl
->array_specifier
== NULL
);
4065 assert(decl
->initializer
== NULL
);
4067 ir_variable
*const earlier
=
4068 state
->symbols
->get_variable(decl
->identifier
);
4069 if (earlier
== NULL
) {
4070 _mesa_glsl_error(& loc
, state
,
4071 "undeclared variable `%s' cannot be marked "
4072 "precise", decl
->identifier
);
4073 } else if (state
->current_function
!= NULL
&&
4074 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4075 /* Note: we have to check if we're in a function, since
4076 * builtins are treated as having come from another scope.
4078 _mesa_glsl_error(& loc
, state
,
4079 "variable `%s' from an outer scope may not be "
4080 "redeclared `precise' in this scope",
4082 } else if (earlier
->data
.used
) {
4083 _mesa_glsl_error(& loc
, state
,
4084 "variable `%s' may not be redeclared "
4085 "`precise' after being used",
4088 earlier
->data
.precise
= true;
4092 /* Precise redeclarations do not have r-values either. */
4096 assert(this->type
!= NULL
);
4097 assert(!this->invariant
);
4098 assert(!this->precise
);
4100 /* The type specifier may contain a structure definition. Process that
4101 * before any of the variable declarations.
4103 (void) this->type
->specifier
->hir(instructions
, state
);
4105 decl_type
= this->type
->glsl_type(& type_name
, state
);
4107 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4108 * "Buffer variables may only be declared inside interface blocks
4109 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4110 * shader storage blocks. It is a compile-time error to declare buffer
4111 * variables at global scope (outside a block)."
4113 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4114 _mesa_glsl_error(&loc
, state
,
4115 "buffer variables cannot be declared outside "
4116 "interface blocks");
4119 /* An offset-qualified atomic counter declaration sets the default
4120 * offset for the next declaration within the same atomic counter
4123 if (decl_type
&& decl_type
->contains_atomic()) {
4124 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4125 type
->qualifier
.flags
.q
.explicit_offset
) {
4126 unsigned qual_binding
;
4127 unsigned qual_offset
;
4128 if (process_qualifier_constant(state
, &loc
, "binding",
4129 type
->qualifier
.binding
,
4131 && process_qualifier_constant(state
, &loc
, "offset",
4132 type
->qualifier
.offset
,
4134 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4139 if (this->declarations
.is_empty()) {
4140 /* If there is no structure involved in the program text, there are two
4141 * possible scenarios:
4143 * - The program text contained something like 'vec4;'. This is an
4144 * empty declaration. It is valid but weird. Emit a warning.
4146 * - The program text contained something like 'S;' and 'S' is not the
4147 * name of a known structure type. This is both invalid and weird.
4150 * - The program text contained something like 'mediump float;'
4151 * when the programmer probably meant 'precision mediump
4152 * float;' Emit a warning with a description of what they
4153 * probably meant to do.
4155 * Note that if decl_type is NULL and there is a structure involved,
4156 * there must have been some sort of error with the structure. In this
4157 * case we assume that an error was already generated on this line of
4158 * code for the structure. There is no need to generate an additional,
4161 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4164 if (decl_type
== NULL
) {
4165 _mesa_glsl_error(&loc
, state
,
4166 "invalid type `%s' in empty declaration",
4168 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4169 /* Empty atomic counter declarations are allowed and useful
4170 * to set the default offset qualifier.
4173 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4174 if (this->type
->specifier
->structure
!= NULL
) {
4175 _mesa_glsl_error(&loc
, state
,
4176 "precision qualifiers can't be applied "
4179 static const char *const precision_names
[] = {
4186 _mesa_glsl_warning(&loc
, state
,
4187 "empty declaration with precision qualifier, "
4188 "to set the default precision, use "
4189 "`precision %s %s;'",
4190 precision_names
[this->type
->qualifier
.precision
],
4193 } else if (this->type
->specifier
->structure
== NULL
) {
4194 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4198 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4199 const struct glsl_type
*var_type
;
4201 const char *identifier
= decl
->identifier
;
4202 /* FINISHME: Emit a warning if a variable declaration shadows a
4203 * FINISHME: declaration at a higher scope.
4206 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4207 if (type_name
!= NULL
) {
4208 _mesa_glsl_error(& loc
, state
,
4209 "invalid type `%s' in declaration of `%s'",
4210 type_name
, decl
->identifier
);
4212 _mesa_glsl_error(& loc
, state
,
4213 "invalid type in declaration of `%s'",
4219 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4223 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4225 _mesa_glsl_error(& loc
, state
,
4226 "invalid type in declaration of `%s'",
4228 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4233 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4236 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4238 /* The 'varying in' and 'varying out' qualifiers can only be used with
4239 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4242 if (this->type
->qualifier
.flags
.q
.varying
) {
4243 if (this->type
->qualifier
.flags
.q
.in
) {
4244 _mesa_glsl_error(& loc
, state
,
4245 "`varying in' qualifier in declaration of "
4246 "`%s' only valid for geometry shaders using "
4247 "ARB_geometry_shader4 or EXT_geometry_shader4",
4249 } else if (this->type
->qualifier
.flags
.q
.out
) {
4250 _mesa_glsl_error(& loc
, state
,
4251 "`varying out' qualifier in declaration of "
4252 "`%s' only valid for geometry shaders using "
4253 "ARB_geometry_shader4 or EXT_geometry_shader4",
4258 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4260 * "Global variables can only use the qualifiers const,
4261 * attribute, uniform, or varying. Only one may be
4264 * Local variables can only use the qualifier const."
4266 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4267 * any extension that adds the 'layout' keyword.
4269 if (!state
->is_version(130, 300)
4270 && !state
->has_explicit_attrib_location()
4271 && !state
->has_separate_shader_objects()
4272 && !state
->ARB_fragment_coord_conventions_enable
) {
4273 if (this->type
->qualifier
.flags
.q
.out
) {
4274 _mesa_glsl_error(& loc
, state
,
4275 "`out' qualifier in declaration of `%s' "
4276 "only valid for function parameters in %s",
4277 decl
->identifier
, state
->get_version_string());
4279 if (this->type
->qualifier
.flags
.q
.in
) {
4280 _mesa_glsl_error(& loc
, state
,
4281 "`in' qualifier in declaration of `%s' "
4282 "only valid for function parameters in %s",
4283 decl
->identifier
, state
->get_version_string());
4285 /* FINISHME: Test for other invalid qualifiers. */
4288 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4290 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4293 if (this->type
->qualifier
.flags
.q
.invariant
) {
4294 if (!is_varying_var(var
, state
->stage
)) {
4295 _mesa_glsl_error(&loc
, state
,
4296 "`%s' cannot be marked invariant; interfaces between "
4297 "shader stages only", var
->name
);
4301 if (state
->current_function
!= NULL
) {
4302 const char *mode
= NULL
;
4303 const char *extra
= "";
4305 /* There is no need to check for 'inout' here because the parser will
4306 * only allow that in function parameter lists.
4308 if (this->type
->qualifier
.flags
.q
.attribute
) {
4310 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4311 mode
= "subroutine uniform";
4312 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4314 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4316 } else if (this->type
->qualifier
.flags
.q
.in
) {
4318 extra
= " or in function parameter list";
4319 } else if (this->type
->qualifier
.flags
.q
.out
) {
4321 extra
= " or in function parameter list";
4325 _mesa_glsl_error(& loc
, state
,
4326 "%s variable `%s' must be declared at "
4328 mode
, var
->name
, extra
);
4330 } else if (var
->data
.mode
== ir_var_shader_in
) {
4331 var
->data
.read_only
= true;
4333 if (state
->stage
== MESA_SHADER_VERTEX
) {
4334 bool error_emitted
= false;
4336 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4338 * "Vertex shader inputs can only be float, floating-point
4339 * vectors, matrices, signed and unsigned integers and integer
4340 * vectors. Vertex shader inputs can also form arrays of these
4341 * types, but not structures."
4343 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4345 * "Vertex shader inputs can only be float, floating-point
4346 * vectors, matrices, signed and unsigned integers and integer
4347 * vectors. They cannot be arrays or structures."
4349 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4351 * "The attribute qualifier can be used only with float,
4352 * floating-point vectors, and matrices. Attribute variables
4353 * cannot be declared as arrays or structures."
4355 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4357 * "Vertex shader inputs can only be float, floating-point
4358 * vectors, matrices, signed and unsigned integers and integer
4359 * vectors. Vertex shader inputs cannot be arrays or
4362 const glsl_type
*check_type
= var
->type
->without_array();
4364 switch (check_type
->base_type
) {
4365 case GLSL_TYPE_FLOAT
:
4367 case GLSL_TYPE_UINT
:
4369 if (state
->is_version(120, 300))
4371 case GLSL_TYPE_DOUBLE
:
4372 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4376 _mesa_glsl_error(& loc
, state
,
4377 "vertex shader input / attribute cannot have "
4379 var
->type
->is_array() ? "array of " : "",
4381 error_emitted
= true;
4384 if (!error_emitted
&& var
->type
->is_array() &&
4385 !state
->check_version(150, 0, &loc
,
4386 "vertex shader input / attribute "
4387 "cannot have array type")) {
4388 error_emitted
= true;
4390 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4391 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4393 * Geometry shader input variables get the per-vertex values
4394 * written out by vertex shader output variables of the same
4395 * names. Since a geometry shader operates on a set of
4396 * vertices, each input varying variable (or input block, see
4397 * interface blocks below) needs to be declared as an array.
4399 if (!var
->type
->is_array()) {
4400 _mesa_glsl_error(&loc
, state
,
4401 "geometry shader inputs must be arrays");
4404 handle_geometry_shader_input_decl(state
, loc
, var
);
4405 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4406 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4408 * It is a compile-time error to declare a fragment shader
4409 * input with, or that contains, any of the following types:
4413 * * An array of arrays
4414 * * An array of structures
4415 * * A structure containing an array
4416 * * A structure containing a structure
4418 if (state
->es_shader
) {
4419 const glsl_type
*check_type
= var
->type
->without_array();
4420 if (check_type
->is_boolean() ||
4421 check_type
->contains_opaque()) {
4422 _mesa_glsl_error(&loc
, state
,
4423 "fragment shader input cannot have type %s",
4426 if (var
->type
->is_array() &&
4427 var
->type
->fields
.array
->is_array()) {
4428 _mesa_glsl_error(&loc
, state
,
4430 "cannot have an array of arrays",
4431 _mesa_shader_stage_to_string(state
->stage
));
4433 if (var
->type
->is_array() &&
4434 var
->type
->fields
.array
->is_record()) {
4435 _mesa_glsl_error(&loc
, state
,
4436 "fragment shader input "
4437 "cannot have an array of structs");
4439 if (var
->type
->is_record()) {
4440 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4441 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4442 var
->type
->fields
.structure
[i
].type
->is_record())
4443 _mesa_glsl_error(&loc
, state
,
4444 "fragement shader input cannot have "
4445 "a struct that contains an "
4450 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4451 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4452 handle_tess_shader_input_decl(state
, loc
, var
);
4454 } else if (var
->data
.mode
== ir_var_shader_out
) {
4455 const glsl_type
*check_type
= var
->type
->without_array();
4457 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4459 * It is a compile-time error to declare a vertex, tessellation
4460 * evaluation, tessellation control, or geometry shader output
4461 * that contains any of the following:
4463 * * A Boolean type (bool, bvec2 ...)
4466 if (check_type
->is_boolean() || check_type
->contains_opaque())
4467 _mesa_glsl_error(&loc
, state
,
4468 "%s shader output cannot have type %s",
4469 _mesa_shader_stage_to_string(state
->stage
),
4472 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4474 * It is a compile-time error to declare a fragment shader output
4475 * that contains any of the following:
4477 * * A Boolean type (bool, bvec2 ...)
4478 * * A double-precision scalar or vector (double, dvec2 ...)
4483 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4484 if (check_type
->is_record() || check_type
->is_matrix())
4485 _mesa_glsl_error(&loc
, state
,
4486 "fragment shader output "
4487 "cannot have struct or matrix type");
4488 switch (check_type
->base_type
) {
4489 case GLSL_TYPE_UINT
:
4491 case GLSL_TYPE_FLOAT
:
4494 _mesa_glsl_error(&loc
, state
,
4495 "fragment shader output cannot have "
4496 "type %s", check_type
->name
);
4500 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4502 * It is a compile-time error to declare a vertex shader output
4503 * with, or that contains, any of the following types:
4507 * * An array of arrays
4508 * * An array of structures
4509 * * A structure containing an array
4510 * * A structure containing a structure
4512 * It is a compile-time error to declare a fragment shader output
4513 * with, or that contains, any of the following types:
4519 * * An array of array
4521 if (state
->es_shader
) {
4522 if (var
->type
->is_array() &&
4523 var
->type
->fields
.array
->is_array()) {
4524 _mesa_glsl_error(&loc
, state
,
4526 "cannot have an array of arrays",
4527 _mesa_shader_stage_to_string(state
->stage
));
4529 if (state
->stage
== MESA_SHADER_VERTEX
) {
4530 if (var
->type
->is_array() &&
4531 var
->type
->fields
.array
->is_record()) {
4532 _mesa_glsl_error(&loc
, state
,
4533 "vertex shader output "
4534 "cannot have an array of structs");
4536 if (var
->type
->is_record()) {
4537 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4538 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4539 var
->type
->fields
.structure
[i
].type
->is_record())
4540 _mesa_glsl_error(&loc
, state
,
4541 "vertex shader output cannot have a "
4542 "struct that contains an "
4549 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4550 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4552 } else if (var
->type
->contains_subroutine()) {
4553 /* declare subroutine uniforms as hidden */
4554 var
->data
.how_declared
= ir_var_hidden
;
4557 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4558 * so must integer vertex outputs.
4560 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4561 * "Fragment shader inputs that are signed or unsigned integers or
4562 * integer vectors must be qualified with the interpolation qualifier
4565 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4566 * "Fragment shader inputs that are, or contain, signed or unsigned
4567 * integers or integer vectors must be qualified with the
4568 * interpolation qualifier flat."
4570 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4571 * "Vertex shader outputs that are, or contain, signed or unsigned
4572 * integers or integer vectors must be qualified with the
4573 * interpolation qualifier flat."
4575 * Note that prior to GLSL 1.50, this requirement applied to vertex
4576 * outputs rather than fragment inputs. That creates problems in the
4577 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4578 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4579 * apply the restriction to both vertex outputs and fragment inputs.
4581 * Note also that the desktop GLSL specs are missing the text "or
4582 * contain"; this is presumably an oversight, since there is no
4583 * reasonable way to interpolate a fragment shader input that contains
4586 if (state
->is_version(130, 300) &&
4587 var
->type
->contains_integer() &&
4588 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4589 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4590 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4591 && state
->es_shader
))) {
4592 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4593 "vertex output" : "fragment input";
4594 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4595 "an integer, then it must be qualified with 'flat'",
4599 /* Double fragment inputs must be qualified with 'flat'. */
4600 if (var
->type
->contains_double() &&
4601 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4602 state
->stage
== MESA_SHADER_FRAGMENT
&&
4603 var
->data
.mode
== ir_var_shader_in
) {
4604 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4605 "a double, then it must be qualified with 'flat'",
4609 /* Interpolation qualifiers cannot be applied to 'centroid' and
4610 * 'centroid varying'.
4612 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4613 * "interpolation qualifiers may only precede the qualifiers in,
4614 * centroid in, out, or centroid out in a declaration. They do not apply
4615 * to the deprecated storage qualifiers varying or centroid varying."
4617 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4619 if (state
->is_version(130, 0)
4620 && this->type
->qualifier
.has_interpolation()
4621 && this->type
->qualifier
.flags
.q
.varying
) {
4623 const char *i
= this->type
->qualifier
.interpolation_string();
4626 if (this->type
->qualifier
.flags
.q
.centroid
)
4627 s
= "centroid varying";
4631 _mesa_glsl_error(&loc
, state
,
4632 "qualifier '%s' cannot be applied to the "
4633 "deprecated storage qualifier '%s'", i
, s
);
4637 /* Interpolation qualifiers can only apply to vertex shader outputs and
4638 * fragment shader inputs.
4640 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4641 * "Outputs from a vertex shader (out) and inputs to a fragment
4642 * shader (in) can be further qualified with one or more of these
4643 * interpolation qualifiers"
4645 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4646 * "These interpolation qualifiers may only precede the qualifiers
4647 * in, centroid in, out, or centroid out in a declaration. They do
4648 * not apply to inputs into a vertex shader or outputs from a
4651 if (state
->is_version(130, 300)
4652 && this->type
->qualifier
.has_interpolation()) {
4654 const char *i
= this->type
->qualifier
.interpolation_string();
4657 switch (state
->stage
) {
4658 case MESA_SHADER_VERTEX
:
4659 if (this->type
->qualifier
.flags
.q
.in
) {
4660 _mesa_glsl_error(&loc
, state
,
4661 "qualifier '%s' cannot be applied to vertex "
4662 "shader inputs", i
);
4665 case MESA_SHADER_FRAGMENT
:
4666 if (this->type
->qualifier
.flags
.q
.out
) {
4667 _mesa_glsl_error(&loc
, state
,
4668 "qualifier '%s' cannot be applied to fragment "
4669 "shader outputs", i
);
4678 /* From section 4.3.4 of the GLSL 4.00 spec:
4679 * "Input variables may not be declared using the patch in qualifier
4680 * in tessellation control or geometry shaders."
4682 * From section 4.3.6 of the GLSL 4.00 spec:
4683 * "It is an error to use patch out in a vertex, tessellation
4684 * evaluation, or geometry shader."
4686 * This doesn't explicitly forbid using them in a fragment shader, but
4687 * that's probably just an oversight.
4689 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4690 && this->type
->qualifier
.flags
.q
.patch
4691 && this->type
->qualifier
.flags
.q
.in
) {
4693 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4694 "tessellation evaluation shader");
4697 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4698 && this->type
->qualifier
.flags
.q
.patch
4699 && this->type
->qualifier
.flags
.q
.out
) {
4701 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4702 "tessellation control shader");
4705 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4707 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4708 state
->check_precision_qualifiers_allowed(&loc
);
4712 /* If a precision qualifier is allowed on a type, it is allowed on
4713 * an array of that type.
4715 if (!(this->type
->qualifier
.precision
== ast_precision_none
4716 || precision_qualifier_allowed(var
->type
->without_array()))) {
4718 _mesa_glsl_error(&loc
, state
,
4719 "precision qualifiers apply only to floating point"
4720 ", integer and opaque types");
4723 /* From section 4.1.7 of the GLSL 4.40 spec:
4725 * "[Opaque types] can only be declared as function
4726 * parameters or uniform-qualified variables."
4728 if (var_type
->contains_opaque() &&
4729 !this->type
->qualifier
.flags
.q
.uniform
) {
4730 _mesa_glsl_error(&loc
, state
,
4731 "opaque variables must be declared uniform");
4734 /* Process the initializer and add its instructions to a temporary
4735 * list. This list will be added to the instruction stream (below) after
4736 * the declaration is added. This is done because in some cases (such as
4737 * redeclarations) the declaration may not actually be added to the
4738 * instruction stream.
4740 exec_list initializer_instructions
;
4742 /* Examine var name here since var may get deleted in the next call */
4743 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4745 ir_variable
*earlier
=
4746 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4747 false /* allow_all_redeclarations */);
4748 if (earlier
!= NULL
) {
4750 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4751 _mesa_glsl_error(&loc
, state
,
4752 "`%s' has already been redeclared using "
4753 "gl_PerVertex", earlier
->name
);
4755 earlier
->data
.how_declared
= ir_var_declared_normally
;
4758 if (decl
->initializer
!= NULL
) {
4759 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4761 &initializer_instructions
, state
);
4763 validate_array_dimensions(var_type
, state
, &loc
);
4766 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4768 * "It is an error to write to a const variable outside of
4769 * its declaration, so they must be initialized when
4772 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4773 _mesa_glsl_error(& loc
, state
,
4774 "const declaration of `%s' must be initialized",
4778 if (state
->es_shader
) {
4779 const glsl_type
*const t
= (earlier
== NULL
)
4780 ? var
->type
: earlier
->type
;
4782 if (t
->is_unsized_array())
4783 /* Section 10.17 of the GLSL ES 1.00 specification states that
4784 * unsized array declarations have been removed from the language.
4785 * Arrays that are sized using an initializer are still explicitly
4786 * sized. However, GLSL ES 1.00 does not allow array
4787 * initializers. That is only allowed in GLSL ES 3.00.
4789 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4791 * "An array type can also be formed without specifying a size
4792 * if the definition includes an initializer:
4794 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4795 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4800 _mesa_glsl_error(& loc
, state
,
4801 "unsized array declarations are not allowed in "
4805 /* If the declaration is not a redeclaration, there are a few additional
4806 * semantic checks that must be applied. In addition, variable that was
4807 * created for the declaration should be added to the IR stream.
4809 if (earlier
== NULL
) {
4810 validate_identifier(decl
->identifier
, loc
, state
);
4812 /* Add the variable to the symbol table. Note that the initializer's
4813 * IR was already processed earlier (though it hasn't been emitted
4814 * yet), without the variable in scope.
4816 * This differs from most C-like languages, but it follows the GLSL
4817 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4820 * "Within a declaration, the scope of a name starts immediately
4821 * after the initializer if present or immediately after the name
4822 * being declared if not."
4824 if (!state
->symbols
->add_variable(var
)) {
4825 YYLTYPE loc
= this->get_location();
4826 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4827 "current scope", decl
->identifier
);
4831 /* Push the variable declaration to the top. It means that all the
4832 * variable declarations will appear in a funny last-to-first order,
4833 * but otherwise we run into trouble if a function is prototyped, a
4834 * global var is decled, then the function is defined with usage of
4835 * the global var. See glslparsertest's CorrectModule.frag.
4837 instructions
->push_head(var
);
4840 instructions
->append_list(&initializer_instructions
);
4844 /* Generally, variable declarations do not have r-values. However,
4845 * one is used for the declaration in
4847 * while (bool b = some_condition()) {
4851 * so we return the rvalue from the last seen declaration here.
4858 ast_parameter_declarator::hir(exec_list
*instructions
,
4859 struct _mesa_glsl_parse_state
*state
)
4862 const struct glsl_type
*type
;
4863 const char *name
= NULL
;
4864 YYLTYPE loc
= this->get_location();
4866 type
= this->type
->glsl_type(& name
, state
);
4870 _mesa_glsl_error(& loc
, state
,
4871 "invalid type `%s' in declaration of `%s'",
4872 name
, this->identifier
);
4874 _mesa_glsl_error(& loc
, state
,
4875 "invalid type in declaration of `%s'",
4879 type
= glsl_type::error_type
;
4882 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4884 * "Functions that accept no input arguments need not use void in the
4885 * argument list because prototypes (or definitions) are required and
4886 * therefore there is no ambiguity when an empty argument list "( )" is
4887 * declared. The idiom "(void)" as a parameter list is provided for
4890 * Placing this check here prevents a void parameter being set up
4891 * for a function, which avoids tripping up checks for main taking
4892 * parameters and lookups of an unnamed symbol.
4894 if (type
->is_void()) {
4895 if (this->identifier
!= NULL
)
4896 _mesa_glsl_error(& loc
, state
,
4897 "named parameter cannot have type `void'");
4903 if (formal_parameter
&& (this->identifier
== NULL
)) {
4904 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4908 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4909 * call already handled the "vec4[..] foo" case.
4911 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4913 if (!type
->is_error() && type
->is_unsized_array()) {
4914 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4916 type
= glsl_type::error_type
;
4920 ir_variable
*var
= new(ctx
)
4921 ir_variable(type
, this->identifier
, ir_var_function_in
);
4923 /* Apply any specified qualifiers to the parameter declaration. Note that
4924 * for function parameters the default mode is 'in'.
4926 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
4929 /* From section 4.1.7 of the GLSL 4.40 spec:
4931 * "Opaque variables cannot be treated as l-values; hence cannot
4932 * be used as out or inout function parameters, nor can they be
4935 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4936 && type
->contains_opaque()) {
4937 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
4938 "contain opaque variables");
4939 type
= glsl_type::error_type
;
4942 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
4944 * "When calling a function, expressions that do not evaluate to
4945 * l-values cannot be passed to parameters declared as out or inout."
4947 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
4949 * "Other binary or unary expressions, non-dereferenced arrays,
4950 * function names, swizzles with repeated fields, and constants
4951 * cannot be l-values."
4953 * So for GLSL 1.10, passing an array as an out or inout parameter is not
4954 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
4956 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4958 && !state
->check_version(120, 100, &loc
,
4959 "arrays cannot be out or inout parameters")) {
4960 type
= glsl_type::error_type
;
4963 instructions
->push_tail(var
);
4965 /* Parameter declarations do not have r-values.
4972 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
4974 exec_list
*ir_parameters
,
4975 _mesa_glsl_parse_state
*state
)
4977 ast_parameter_declarator
*void_param
= NULL
;
4980 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
4981 param
->formal_parameter
= formal
;
4982 param
->hir(ir_parameters
, state
);
4990 if ((void_param
!= NULL
) && (count
> 1)) {
4991 YYLTYPE loc
= void_param
->get_location();
4993 _mesa_glsl_error(& loc
, state
,
4994 "`void' parameter must be only parameter");
5000 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5002 /* IR invariants disallow function declarations or definitions
5003 * nested within other function definitions. But there is no
5004 * requirement about the relative order of function declarations
5005 * and definitions with respect to one another. So simply insert
5006 * the new ir_function block at the end of the toplevel instruction
5009 state
->toplevel_ir
->push_tail(f
);
5014 ast_function::hir(exec_list
*instructions
,
5015 struct _mesa_glsl_parse_state
*state
)
5018 ir_function
*f
= NULL
;
5019 ir_function_signature
*sig
= NULL
;
5020 exec_list hir_parameters
;
5021 YYLTYPE loc
= this->get_location();
5023 const char *const name
= identifier
;
5025 /* New functions are always added to the top-level IR instruction stream,
5026 * so this instruction list pointer is ignored. See also emit_function
5029 (void) instructions
;
5031 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5033 * "Function declarations (prototypes) cannot occur inside of functions;
5034 * they must be at global scope, or for the built-in functions, outside
5035 * the global scope."
5037 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5039 * "User defined functions may only be defined within the global scope."
5041 * Note that this language does not appear in GLSL 1.10.
5043 if ((state
->current_function
!= NULL
) &&
5044 state
->is_version(120, 100)) {
5045 YYLTYPE loc
= this->get_location();
5046 _mesa_glsl_error(&loc
, state
,
5047 "declaration of function `%s' not allowed within "
5048 "function body", name
);
5051 validate_identifier(name
, this->get_location(), state
);
5053 /* Convert the list of function parameters to HIR now so that they can be
5054 * used below to compare this function's signature with previously seen
5055 * signatures for functions with the same name.
5057 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5059 & hir_parameters
, state
);
5061 const char *return_type_name
;
5062 const glsl_type
*return_type
=
5063 this->return_type
->glsl_type(& return_type_name
, state
);
5066 YYLTYPE loc
= this->get_location();
5067 _mesa_glsl_error(&loc
, state
,
5068 "function `%s' has undeclared return type `%s'",
5069 name
, return_type_name
);
5070 return_type
= glsl_type::error_type
;
5073 /* ARB_shader_subroutine states:
5074 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5075 * subroutine(...) to a function declaration."
5077 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5078 YYLTYPE loc
= this->get_location();
5079 _mesa_glsl_error(&loc
, state
,
5080 "function declaration `%s' cannot have subroutine prepended",
5084 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5085 * "No qualifier is allowed on the return type of a function."
5087 if (this->return_type
->has_qualifiers(state
)) {
5088 YYLTYPE loc
= this->get_location();
5089 _mesa_glsl_error(& loc
, state
,
5090 "function `%s' return type has qualifiers", name
);
5093 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5095 * "Arrays are allowed as arguments and as the return type. In both
5096 * cases, the array must be explicitly sized."
5098 if (return_type
->is_unsized_array()) {
5099 YYLTYPE loc
= this->get_location();
5100 _mesa_glsl_error(& loc
, state
,
5101 "function `%s' return type array must be explicitly "
5105 /* From section 4.1.7 of the GLSL 4.40 spec:
5107 * "[Opaque types] can only be declared as function parameters
5108 * or uniform-qualified variables."
5110 if (return_type
->contains_opaque()) {
5111 YYLTYPE loc
= this->get_location();
5112 _mesa_glsl_error(&loc
, state
,
5113 "function `%s' return type can't contain an opaque type",
5117 /* Create an ir_function if one doesn't already exist. */
5118 f
= state
->symbols
->get_function(name
);
5120 f
= new(ctx
) ir_function(name
);
5121 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5122 if (!state
->symbols
->add_function(f
)) {
5123 /* This function name shadows a non-function use of the same name. */
5124 YYLTYPE loc
= this->get_location();
5125 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5126 "non-function", name
);
5130 emit_function(state
, f
);
5133 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5135 * "A shader cannot redefine or overload built-in functions."
5137 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5139 * "User code can overload the built-in functions but cannot redefine
5142 if (state
->es_shader
&& state
->language_version
>= 300) {
5143 /* Local shader has no exact candidates; check the built-ins. */
5144 _mesa_glsl_initialize_builtin_functions();
5145 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5146 YYLTYPE loc
= this->get_location();
5147 _mesa_glsl_error(& loc
, state
,
5148 "A shader cannot redefine or overload built-in "
5149 "function `%s' in GLSL ES 3.00", name
);
5154 /* Verify that this function's signature either doesn't match a previously
5155 * seen signature for a function with the same name, or, if a match is found,
5156 * that the previously seen signature does not have an associated definition.
5158 if (state
->es_shader
|| f
->has_user_signature()) {
5159 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5161 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5162 if (badvar
!= NULL
) {
5163 YYLTYPE loc
= this->get_location();
5165 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5166 "qualifiers don't match prototype", name
, badvar
);
5169 if (sig
->return_type
!= return_type
) {
5170 YYLTYPE loc
= this->get_location();
5172 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5173 "match prototype", name
);
5176 if (sig
->is_defined
) {
5177 if (is_definition
) {
5178 YYLTYPE loc
= this->get_location();
5179 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5181 /* We just encountered a prototype that exactly matches a
5182 * function that's already been defined. This is redundant,
5183 * and we should ignore it.
5191 /* Verify the return type of main() */
5192 if (strcmp(name
, "main") == 0) {
5193 if (! return_type
->is_void()) {
5194 YYLTYPE loc
= this->get_location();
5196 _mesa_glsl_error(& loc
, state
, "main() must return void");
5199 if (!hir_parameters
.is_empty()) {
5200 YYLTYPE loc
= this->get_location();
5202 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5206 /* Finish storing the information about this new function in its signature.
5209 sig
= new(ctx
) ir_function_signature(return_type
);
5210 f
->add_signature(sig
);
5213 sig
->replace_parameters(&hir_parameters
);
5216 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5219 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5220 unsigned qual_index
;
5221 if (process_qualifier_constant(state
, &loc
, "index",
5222 this->return_type
->qualifier
.index
,
5224 if (!state
->has_explicit_uniform_location()) {
5225 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5226 "GL_ARB_explicit_uniform_location or "
5228 } else if (qual_index
>= MAX_SUBROUTINES
) {
5229 _mesa_glsl_error(&loc
, state
,
5230 "invalid subroutine index (%d) index must "
5231 "be a number between 0 and "
5232 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5233 MAX_SUBROUTINES
- 1);
5235 f
->subroutine_index
= qual_index
;
5240 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5241 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5242 f
->num_subroutine_types
);
5244 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5245 const struct glsl_type
*type
;
5246 /* the subroutine type must be already declared */
5247 type
= state
->symbols
->get_type(decl
->identifier
);
5249 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5251 f
->subroutine_types
[idx
++] = type
;
5253 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5255 state
->num_subroutines
+ 1);
5256 state
->subroutines
[state
->num_subroutines
] = f
;
5257 state
->num_subroutines
++;
5261 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5262 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5263 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5266 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5268 state
->num_subroutine_types
+ 1);
5269 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5270 state
->num_subroutine_types
++;
5272 f
->is_subroutine
= true;
5275 /* Function declarations (prototypes) do not have r-values.
5282 ast_function_definition::hir(exec_list
*instructions
,
5283 struct _mesa_glsl_parse_state
*state
)
5285 prototype
->is_definition
= true;
5286 prototype
->hir(instructions
, state
);
5288 ir_function_signature
*signature
= prototype
->signature
;
5289 if (signature
== NULL
)
5292 assert(state
->current_function
== NULL
);
5293 state
->current_function
= signature
;
5294 state
->found_return
= false;
5296 /* Duplicate parameters declared in the prototype as concrete variables.
5297 * Add these to the symbol table.
5299 state
->symbols
->push_scope();
5300 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5301 assert(var
->as_variable() != NULL
);
5303 /* The only way a parameter would "exist" is if two parameters have
5306 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5307 YYLTYPE loc
= this->get_location();
5309 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5311 state
->symbols
->add_variable(var
);
5315 /* Convert the body of the function to HIR. */
5316 this->body
->hir(&signature
->body
, state
);
5317 signature
->is_defined
= true;
5319 state
->symbols
->pop_scope();
5321 assert(state
->current_function
== signature
);
5322 state
->current_function
= NULL
;
5324 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5325 YYLTYPE loc
= this->get_location();
5326 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5327 "%s, but no return statement",
5328 signature
->function_name(),
5329 signature
->return_type
->name
);
5332 /* Function definitions do not have r-values.
5339 ast_jump_statement::hir(exec_list
*instructions
,
5340 struct _mesa_glsl_parse_state
*state
)
5347 assert(state
->current_function
);
5349 if (opt_return_value
) {
5350 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5352 /* The value of the return type can be NULL if the shader says
5353 * 'return foo();' and foo() is a function that returns void.
5355 * NOTE: The GLSL spec doesn't say that this is an error. The type
5356 * of the return value is void. If the return type of the function is
5357 * also void, then this should compile without error. Seriously.
5359 const glsl_type
*const ret_type
=
5360 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5362 /* Implicit conversions are not allowed for return values prior to
5363 * ARB_shading_language_420pack.
5365 if (state
->current_function
->return_type
!= ret_type
) {
5366 YYLTYPE loc
= this->get_location();
5368 if (state
->ARB_shading_language_420pack_enable
) {
5369 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5371 _mesa_glsl_error(& loc
, state
,
5372 "could not implicitly convert return value "
5373 "to %s, in function `%s'",
5374 state
->current_function
->return_type
->name
,
5375 state
->current_function
->function_name());
5378 _mesa_glsl_error(& loc
, state
,
5379 "`return' with wrong type %s, in function `%s' "
5382 state
->current_function
->function_name(),
5383 state
->current_function
->return_type
->name
);
5385 } else if (state
->current_function
->return_type
->base_type
==
5387 YYLTYPE loc
= this->get_location();
5389 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5390 * specs add a clarification:
5392 * "A void function can only use return without a return argument, even if
5393 * the return argument has void type. Return statements only accept values:
5396 * void func2() { return func1(); } // illegal return statement"
5398 _mesa_glsl_error(& loc
, state
,
5399 "void functions can only use `return' without a "
5403 inst
= new(ctx
) ir_return(ret
);
5405 if (state
->current_function
->return_type
->base_type
!=
5407 YYLTYPE loc
= this->get_location();
5409 _mesa_glsl_error(& loc
, state
,
5410 "`return' with no value, in function %s returning "
5412 state
->current_function
->function_name());
5414 inst
= new(ctx
) ir_return
;
5417 state
->found_return
= true;
5418 instructions
->push_tail(inst
);
5423 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5424 YYLTYPE loc
= this->get_location();
5426 _mesa_glsl_error(& loc
, state
,
5427 "`discard' may only appear in a fragment shader");
5429 instructions
->push_tail(new(ctx
) ir_discard
);
5434 if (mode
== ast_continue
&&
5435 state
->loop_nesting_ast
== NULL
) {
5436 YYLTYPE loc
= this->get_location();
5438 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5439 } else if (mode
== ast_break
&&
5440 state
->loop_nesting_ast
== NULL
&&
5441 state
->switch_state
.switch_nesting_ast
== NULL
) {
5442 YYLTYPE loc
= this->get_location();
5444 _mesa_glsl_error(& loc
, state
,
5445 "break may only appear in a loop or a switch");
5447 /* For a loop, inline the for loop expression again, since we don't
5448 * know where near the end of the loop body the normal copy of it is
5449 * going to be placed. Same goes for the condition for a do-while
5452 if (state
->loop_nesting_ast
!= NULL
&&
5453 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5454 if (state
->loop_nesting_ast
->rest_expression
) {
5455 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5458 if (state
->loop_nesting_ast
->mode
==
5459 ast_iteration_statement::ast_do_while
) {
5460 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5464 if (state
->switch_state
.is_switch_innermost
&&
5465 mode
== ast_continue
) {
5466 /* Set 'continue_inside' to true. */
5467 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5468 ir_dereference_variable
*deref_continue_inside_var
=
5469 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5470 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5473 /* Break out from the switch, continue for the loop will
5474 * be called right after switch. */
5475 ir_loop_jump
*const jump
=
5476 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5477 instructions
->push_tail(jump
);
5479 } else if (state
->switch_state
.is_switch_innermost
&&
5480 mode
== ast_break
) {
5481 /* Force break out of switch by inserting a break. */
5482 ir_loop_jump
*const jump
=
5483 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5484 instructions
->push_tail(jump
);
5486 ir_loop_jump
*const jump
=
5487 new(ctx
) ir_loop_jump((mode
== ast_break
)
5488 ? ir_loop_jump::jump_break
5489 : ir_loop_jump::jump_continue
);
5490 instructions
->push_tail(jump
);
5497 /* Jump instructions do not have r-values.
5504 ast_selection_statement::hir(exec_list
*instructions
,
5505 struct _mesa_glsl_parse_state
*state
)
5509 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5511 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5513 * "Any expression whose type evaluates to a Boolean can be used as the
5514 * conditional expression bool-expression. Vector types are not accepted
5515 * as the expression to if."
5517 * The checks are separated so that higher quality diagnostics can be
5518 * generated for cases where both rules are violated.
5520 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5521 YYLTYPE loc
= this->condition
->get_location();
5523 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5527 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5529 if (then_statement
!= NULL
) {
5530 state
->symbols
->push_scope();
5531 then_statement
->hir(& stmt
->then_instructions
, state
);
5532 state
->symbols
->pop_scope();
5535 if (else_statement
!= NULL
) {
5536 state
->symbols
->push_scope();
5537 else_statement
->hir(& stmt
->else_instructions
, state
);
5538 state
->symbols
->pop_scope();
5541 instructions
->push_tail(stmt
);
5543 /* if-statements do not have r-values.
5550 ast_switch_statement::hir(exec_list
*instructions
,
5551 struct _mesa_glsl_parse_state
*state
)
5555 ir_rvalue
*const test_expression
=
5556 this->test_expression
->hir(instructions
, state
);
5558 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5560 * "The type of init-expression in a switch statement must be a
5563 if (!test_expression
->type
->is_scalar() ||
5564 !test_expression
->type
->is_integer()) {
5565 YYLTYPE loc
= this->test_expression
->get_location();
5567 _mesa_glsl_error(& loc
,
5569 "switch-statement expression must be scalar "
5573 /* Track the switch-statement nesting in a stack-like manner.
5575 struct glsl_switch_state saved
= state
->switch_state
;
5577 state
->switch_state
.is_switch_innermost
= true;
5578 state
->switch_state
.switch_nesting_ast
= this;
5579 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5580 hash_table_pointer_compare
);
5581 state
->switch_state
.previous_default
= NULL
;
5583 /* Initalize is_fallthru state to false.
5585 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5586 state
->switch_state
.is_fallthru_var
=
5587 new(ctx
) ir_variable(glsl_type::bool_type
,
5588 "switch_is_fallthru_tmp",
5590 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5592 ir_dereference_variable
*deref_is_fallthru_var
=
5593 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5594 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5597 /* Initialize continue_inside state to false.
5599 state
->switch_state
.continue_inside
=
5600 new(ctx
) ir_variable(glsl_type::bool_type
,
5601 "continue_inside_tmp",
5603 instructions
->push_tail(state
->switch_state
.continue_inside
);
5605 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5606 ir_dereference_variable
*deref_continue_inside_var
=
5607 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5608 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5611 state
->switch_state
.run_default
=
5612 new(ctx
) ir_variable(glsl_type::bool_type
,
5615 instructions
->push_tail(state
->switch_state
.run_default
);
5617 /* Loop around the switch is used for flow control. */
5618 ir_loop
* loop
= new(ctx
) ir_loop();
5619 instructions
->push_tail(loop
);
5621 /* Cache test expression.
5623 test_to_hir(&loop
->body_instructions
, state
);
5625 /* Emit code for body of switch stmt.
5627 body
->hir(&loop
->body_instructions
, state
);
5629 /* Insert a break at the end to exit loop. */
5630 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5631 loop
->body_instructions
.push_tail(jump
);
5633 /* If we are inside loop, check if continue got called inside switch. */
5634 if (state
->loop_nesting_ast
!= NULL
) {
5635 ir_dereference_variable
*deref_continue_inside
=
5636 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5637 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5638 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5640 if (state
->loop_nesting_ast
!= NULL
) {
5641 if (state
->loop_nesting_ast
->rest_expression
) {
5642 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5645 if (state
->loop_nesting_ast
->mode
==
5646 ast_iteration_statement::ast_do_while
) {
5647 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5650 irif
->then_instructions
.push_tail(jump
);
5651 instructions
->push_tail(irif
);
5654 hash_table_dtor(state
->switch_state
.labels_ht
);
5656 state
->switch_state
= saved
;
5658 /* Switch statements do not have r-values. */
5664 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5665 struct _mesa_glsl_parse_state
*state
)
5669 /* Cache value of test expression. */
5670 ir_rvalue
*const test_val
=
5671 test_expression
->hir(instructions
,
5674 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5677 ir_dereference_variable
*deref_test_var
=
5678 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5680 instructions
->push_tail(state
->switch_state
.test_var
);
5681 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5686 ast_switch_body::hir(exec_list
*instructions
,
5687 struct _mesa_glsl_parse_state
*state
)
5690 stmts
->hir(instructions
, state
);
5692 /* Switch bodies do not have r-values. */
5697 ast_case_statement_list::hir(exec_list
*instructions
,
5698 struct _mesa_glsl_parse_state
*state
)
5700 exec_list default_case
, after_default
, tmp
;
5702 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5703 case_stmt
->hir(&tmp
, state
);
5706 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5707 default_case
.append_list(&tmp
);
5711 /* If default case found, append 'after_default' list. */
5712 if (!default_case
.is_empty())
5713 after_default
.append_list(&tmp
);
5715 instructions
->append_list(&tmp
);
5718 /* Handle the default case. This is done here because default might not be
5719 * the last case. We need to add checks against following cases first to see
5720 * if default should be chosen or not.
5722 if (!default_case
.is_empty()) {
5724 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5725 ir_dereference_variable
*deref_run_default_var
=
5726 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5728 /* Choose to run default case initially, following conditional
5729 * assignments might change this.
5731 ir_assignment
*const init_var
=
5732 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5733 instructions
->push_tail(init_var
);
5735 /* Default case was the last one, no checks required. */
5736 if (after_default
.is_empty()) {
5737 instructions
->append_list(&default_case
);
5741 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5742 ir_assignment
*assign
= ir
->as_assignment();
5747 /* Clone the check between case label and init expression. */
5748 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5749 ir_expression
*clone
= exp
->clone(state
, NULL
);
5751 ir_dereference_variable
*deref_var
=
5752 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5753 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5755 ir_assignment
*const set_false
=
5756 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5758 instructions
->push_tail(set_false
);
5761 /* Append default case and all cases after it. */
5762 instructions
->append_list(&default_case
);
5763 instructions
->append_list(&after_default
);
5766 /* Case statements do not have r-values. */
5771 ast_case_statement::hir(exec_list
*instructions
,
5772 struct _mesa_glsl_parse_state
*state
)
5774 labels
->hir(instructions
, state
);
5776 /* Guard case statements depending on fallthru state. */
5777 ir_dereference_variable
*const deref_fallthru_guard
=
5778 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5779 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5781 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5782 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5784 instructions
->push_tail(test_fallthru
);
5786 /* Case statements do not have r-values. */
5792 ast_case_label_list::hir(exec_list
*instructions
,
5793 struct _mesa_glsl_parse_state
*state
)
5795 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5796 label
->hir(instructions
, state
);
5798 /* Case labels do not have r-values. */
5803 ast_case_label::hir(exec_list
*instructions
,
5804 struct _mesa_glsl_parse_state
*state
)
5808 ir_dereference_variable
*deref_fallthru_var
=
5809 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5811 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5813 /* If not default case, ... */
5814 if (this->test_value
!= NULL
) {
5815 /* Conditionally set fallthru state based on
5816 * comparison of cached test expression value to case label.
5818 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5819 ir_constant
*label_const
= label_rval
->constant_expression_value();
5822 YYLTYPE loc
= this->test_value
->get_location();
5824 _mesa_glsl_error(& loc
, state
,
5825 "switch statement case label must be a "
5826 "constant expression");
5828 /* Stuff a dummy value in to allow processing to continue. */
5829 label_const
= new(ctx
) ir_constant(0);
5831 ast_expression
*previous_label
= (ast_expression
*)
5832 hash_table_find(state
->switch_state
.labels_ht
,
5833 (void *)(uintptr_t)label_const
->value
.u
[0]);
5835 if (previous_label
) {
5836 YYLTYPE loc
= this->test_value
->get_location();
5837 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5839 loc
= previous_label
->get_location();
5840 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5842 hash_table_insert(state
->switch_state
.labels_ht
,
5844 (void *)(uintptr_t)label_const
->value
.u
[0]);
5848 ir_dereference_variable
*deref_test_var
=
5849 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5851 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5856 * From GLSL 4.40 specification section 6.2 ("Selection"):
5858 * "The type of the init-expression value in a switch statement must
5859 * be a scalar int or uint. The type of the constant-expression value
5860 * in a case label also must be a scalar int or uint. When any pair
5861 * of these values is tested for "equal value" and the types do not
5862 * match, an implicit conversion will be done to convert the int to a
5863 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5866 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5867 YYLTYPE loc
= this->test_value
->get_location();
5869 const glsl_type
*type_a
= label_const
->type
;
5870 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5872 /* Check if int->uint implicit conversion is supported. */
5873 bool integer_conversion_supported
=
5874 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5877 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5878 !integer_conversion_supported
) {
5879 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
5880 "init-expression and case label (%s != %s)",
5881 type_a
->name
, type_b
->name
);
5883 /* Conversion of the case label. */
5884 if (type_a
->base_type
== GLSL_TYPE_INT
) {
5885 if (!apply_implicit_conversion(glsl_type::uint_type
,
5886 test_cond
->operands
[0], state
))
5887 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5889 /* Conversion of the init-expression value. */
5890 if (!apply_implicit_conversion(glsl_type::uint_type
,
5891 test_cond
->operands
[1], state
))
5892 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5897 ir_assignment
*set_fallthru_on_test
=
5898 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5900 instructions
->push_tail(set_fallthru_on_test
);
5901 } else { /* default case */
5902 if (state
->switch_state
.previous_default
) {
5903 YYLTYPE loc
= this->get_location();
5904 _mesa_glsl_error(& loc
, state
,
5905 "multiple default labels in one switch");
5907 loc
= state
->switch_state
.previous_default
->get_location();
5908 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5910 state
->switch_state
.previous_default
= this;
5912 /* Set fallthru condition on 'run_default' bool. */
5913 ir_dereference_variable
*deref_run_default
=
5914 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5915 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5916 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5920 /* Set falltrhu state. */
5921 ir_assignment
*set_fallthru
=
5922 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5924 instructions
->push_tail(set_fallthru
);
5927 /* Case statements do not have r-values. */
5932 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
5933 struct _mesa_glsl_parse_state
*state
)
5937 if (condition
!= NULL
) {
5938 ir_rvalue
*const cond
=
5939 condition
->hir(instructions
, state
);
5942 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
5943 YYLTYPE loc
= condition
->get_location();
5945 _mesa_glsl_error(& loc
, state
,
5946 "loop condition must be scalar boolean");
5948 /* As the first code in the loop body, generate a block that looks
5949 * like 'if (!condition) break;' as the loop termination condition.
5951 ir_rvalue
*const not_cond
=
5952 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
5954 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
5956 ir_jump
*const break_stmt
=
5957 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5959 if_stmt
->then_instructions
.push_tail(break_stmt
);
5960 instructions
->push_tail(if_stmt
);
5967 ast_iteration_statement::hir(exec_list
*instructions
,
5968 struct _mesa_glsl_parse_state
*state
)
5972 /* For-loops and while-loops start a new scope, but do-while loops do not.
5974 if (mode
!= ast_do_while
)
5975 state
->symbols
->push_scope();
5977 if (init_statement
!= NULL
)
5978 init_statement
->hir(instructions
, state
);
5980 ir_loop
*const stmt
= new(ctx
) ir_loop();
5981 instructions
->push_tail(stmt
);
5983 /* Track the current loop nesting. */
5984 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
5986 state
->loop_nesting_ast
= this;
5988 /* Likewise, indicate that following code is closest to a loop,
5989 * NOT closest to a switch.
5991 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
5992 state
->switch_state
.is_switch_innermost
= false;
5994 if (mode
!= ast_do_while
)
5995 condition_to_hir(&stmt
->body_instructions
, state
);
5998 body
->hir(& stmt
->body_instructions
, state
);
6000 if (rest_expression
!= NULL
)
6001 rest_expression
->hir(& stmt
->body_instructions
, state
);
6003 if (mode
== ast_do_while
)
6004 condition_to_hir(&stmt
->body_instructions
, state
);
6006 if (mode
!= ast_do_while
)
6007 state
->symbols
->pop_scope();
6009 /* Restore previous nesting before returning. */
6010 state
->loop_nesting_ast
= nesting_ast
;
6011 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6013 /* Loops do not have r-values.
6020 * Determine if the given type is valid for establishing a default precision
6023 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6025 * "The precision statement
6027 * precision precision-qualifier type;
6029 * can be used to establish a default precision qualifier. The type field
6030 * can be either int or float or any of the sampler types, and the
6031 * precision-qualifier can be lowp, mediump, or highp."
6033 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6034 * qualifiers on sampler types, but this seems like an oversight (since the
6035 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6036 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6040 is_valid_default_precision_type(const struct glsl_type
*const type
)
6045 switch (type
->base_type
) {
6047 case GLSL_TYPE_FLOAT
:
6048 /* "int" and "float" are valid, but vectors and matrices are not. */
6049 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6050 case GLSL_TYPE_SAMPLER
:
6051 case GLSL_TYPE_IMAGE
:
6052 case GLSL_TYPE_ATOMIC_UINT
:
6061 ast_type_specifier::hir(exec_list
*instructions
,
6062 struct _mesa_glsl_parse_state
*state
)
6064 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6067 YYLTYPE loc
= this->get_location();
6069 /* If this is a precision statement, check that the type to which it is
6070 * applied is either float or int.
6072 * From section 4.5.3 of the GLSL 1.30 spec:
6073 * "The precision statement
6074 * precision precision-qualifier type;
6075 * can be used to establish a default precision qualifier. The type
6076 * field can be either int or float [...]. Any other types or
6077 * qualifiers will result in an error.
6079 if (this->default_precision
!= ast_precision_none
) {
6080 if (!state
->check_precision_qualifiers_allowed(&loc
))
6083 if (this->structure
!= NULL
) {
6084 _mesa_glsl_error(&loc
, state
,
6085 "precision qualifiers do not apply to structures");
6089 if (this->array_specifier
!= NULL
) {
6090 _mesa_glsl_error(&loc
, state
,
6091 "default precision statements do not apply to "
6096 const struct glsl_type
*const type
=
6097 state
->symbols
->get_type(this->type_name
);
6098 if (!is_valid_default_precision_type(type
)) {
6099 _mesa_glsl_error(&loc
, state
,
6100 "default precision statements apply only to "
6101 "float, int, and opaque types");
6105 if (state
->es_shader
) {
6106 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6109 * "Non-precision qualified declarations will use the precision
6110 * qualifier specified in the most recent precision statement
6111 * that is still in scope. The precision statement has the same
6112 * scoping rules as variable declarations. If it is declared
6113 * inside a compound statement, its effect stops at the end of
6114 * the innermost statement it was declared in. Precision
6115 * statements in nested scopes override precision statements in
6116 * outer scopes. Multiple precision statements for the same basic
6117 * type can appear inside the same scope, with later statements
6118 * overriding earlier statements within that scope."
6120 * Default precision specifications follow the same scope rules as
6121 * variables. So, we can track the state of the default precision
6122 * qualifiers in the symbol table, and the rules will just work. This
6123 * is a slight abuse of the symbol table, but it has the semantics
6126 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6127 this->default_precision
);
6130 /* FINISHME: Translate precision statements into IR. */
6134 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6135 * process_record_constructor() can do type-checking on C-style initializer
6136 * expressions of structs, but ast_struct_specifier should only be translated
6137 * to HIR if it is declaring the type of a structure.
6139 * The ->is_declaration field is false for initializers of variables
6140 * declared separately from the struct's type definition.
6142 * struct S { ... }; (is_declaration = true)
6143 * struct T { ... } t = { ... }; (is_declaration = true)
6144 * S s = { ... }; (is_declaration = false)
6146 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6147 return this->structure
->hir(instructions
, state
);
6154 * Process a structure or interface block tree into an array of structure fields
6156 * After parsing, where there are some syntax differnces, structures and
6157 * interface blocks are almost identical. They are similar enough that the
6158 * AST for each can be processed the same way into a set of
6159 * \c glsl_struct_field to describe the members.
6161 * If we're processing an interface block, var_mode should be the type of the
6162 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6163 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6167 * The number of fields processed. A pointer to the array structure fields is
6168 * stored in \c *fields_ret.
6171 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6172 struct _mesa_glsl_parse_state
*state
,
6173 exec_list
*declarations
,
6174 glsl_struct_field
**fields_ret
,
6176 enum glsl_matrix_layout matrix_layout
,
6177 bool allow_reserved_names
,
6178 ir_variable_mode var_mode
,
6179 ast_type_qualifier
*layout
,
6180 unsigned block_stream
)
6182 unsigned decl_count
= 0;
6184 /* Make an initial pass over the list of fields to determine how
6185 * many there are. Each element in this list is an ast_declarator_list.
6186 * This means that we actually need to count the number of elements in the
6187 * 'declarations' list in each of the elements.
6189 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6190 decl_count
+= decl_list
->declarations
.length();
6193 /* Allocate storage for the fields and process the field
6194 * declarations. As the declarations are processed, try to also convert
6195 * the types to HIR. This ensures that structure definitions embedded in
6196 * other structure definitions or in interface blocks are processed.
6198 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6202 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6203 const char *type_name
;
6204 YYLTYPE loc
= decl_list
->get_location();
6206 decl_list
->type
->specifier
->hir(instructions
, state
);
6208 /* Section 10.9 of the GLSL ES 1.00 specification states that
6209 * embedded structure definitions have been removed from the language.
6211 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
6212 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
6213 "not allowed in GLSL ES 1.00");
6216 const glsl_type
*decl_type
=
6217 decl_list
->type
->glsl_type(& type_name
, state
);
6219 const struct ast_type_qualifier
*const qual
=
6220 &decl_list
->type
->qualifier
;
6222 /* From section 4.3.9 of the GLSL 4.40 spec:
6224 * "[In interface blocks] opaque types are not allowed."
6226 * It should be impossible for decl_type to be NULL here. Cases that
6227 * might naturally lead to decl_type being NULL, especially for the
6228 * is_interface case, will have resulted in compilation having
6229 * already halted due to a syntax error.
6233 if (is_interface
&& decl_type
->contains_opaque()) {
6234 _mesa_glsl_error(&loc
, state
,
6235 "uniform/buffer in non-default interface block contains "
6239 if (decl_type
->contains_atomic()) {
6240 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6242 * "Members of structures cannot be declared as atomic counter
6245 _mesa_glsl_error(&loc
, state
, "atomic counter in structure, "
6246 "shader storage block or uniform block");
6249 if (decl_type
->contains_image()) {
6250 /* FINISHME: Same problem as with atomic counters.
6251 * FINISHME: Request clarification from Khronos and add
6252 * FINISHME: spec quotation here.
6254 _mesa_glsl_error(&loc
, state
,
6255 "image in structure, shader storage block or "
6259 if (qual
->flags
.q
.explicit_binding
) {
6260 _mesa_glsl_error(&loc
, state
,
6261 "binding layout qualifier cannot be applied "
6262 "to struct or interface block members");
6265 if (qual
->flags
.q
.std140
||
6266 qual
->flags
.q
.std430
||
6267 qual
->flags
.q
.packed
||
6268 qual
->flags
.q
.shared
) {
6269 _mesa_glsl_error(&loc
, state
,
6270 "uniform/shader storage block layout qualifiers "
6271 "std140, std430, packed, and shared can only be "
6272 "applied to uniform/shader storage blocks, not "
6276 if (qual
->flags
.q
.constant
) {
6277 _mesa_glsl_error(&loc
, state
,
6278 "const storage qualifier cannot be applied "
6279 "to struct or interface block members");
6282 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6284 * "A block member may be declared with a stream identifier, but
6285 * the specified stream must match the stream associated with the
6286 * containing block."
6288 if (qual
->flags
.q
.explicit_stream
) {
6289 unsigned qual_stream
;
6290 if (process_qualifier_constant(state
, &loc
, "stream",
6291 qual
->stream
, &qual_stream
) &&
6292 qual_stream
!= block_stream
) {
6293 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6294 "interface block member does not match "
6295 "the interface block (%d vs %d)", qual
->stream
,
6300 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6301 _mesa_glsl_error(&loc
, state
,
6302 "interpolation qualifiers cannot be used "
6303 "with uniform interface blocks");
6306 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6307 qual
->has_auxiliary_storage()) {
6308 _mesa_glsl_error(&loc
, state
,
6309 "auxiliary storage qualifiers cannot be used "
6310 "in uniform blocks or structures.");
6313 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6314 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6315 _mesa_glsl_error(&loc
, state
,
6316 "row_major and column_major can only be "
6317 "applied to interface blocks");
6319 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6322 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6323 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6324 "readonly and writeonly.");
6327 foreach_list_typed (ast_declaration
, decl
, link
,
6328 &decl_list
->declarations
) {
6329 YYLTYPE loc
= decl
->get_location();
6331 if (!allow_reserved_names
)
6332 validate_identifier(decl
->identifier
, loc
, state
);
6334 const struct glsl_type
*field_type
=
6335 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6336 validate_array_dimensions(field_type
, state
, &loc
);
6337 fields
[i
].type
= field_type
;
6338 fields
[i
].name
= decl
->identifier
;
6339 fields
[i
].location
= -1;
6340 fields
[i
].interpolation
=
6341 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
6342 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6343 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6344 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6345 fields
[i
].precision
= qual
->precision
;
6347 /* Propogate row- / column-major information down the fields of the
6348 * structure or interface block. Structures need this data because
6349 * the structure may contain a structure that contains ... a matrix
6350 * that need the proper layout.
6352 if (field_type
->without_array()->is_matrix()
6353 || field_type
->without_array()->is_record()) {
6354 /* If no layout is specified for the field, inherit the layout
6357 fields
[i
].matrix_layout
= matrix_layout
;
6359 if (qual
->flags
.q
.row_major
)
6360 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6361 else if (qual
->flags
.q
.column_major
)
6362 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6364 /* If we're processing an interface block, the matrix layout must
6365 * be decided by this point.
6367 assert(!is_interface
6368 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6369 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6372 /* Image qualifiers are allowed on buffer variables, which can only
6373 * be defined inside shader storage buffer objects
6375 if (layout
&& var_mode
== ir_var_shader_storage
) {
6376 /* For readonly and writeonly qualifiers the field definition,
6377 * if set, overwrites the layout qualifier.
6379 if (qual
->flags
.q
.read_only
) {
6380 fields
[i
].image_read_only
= true;
6381 fields
[i
].image_write_only
= false;
6382 } else if (qual
->flags
.q
.write_only
) {
6383 fields
[i
].image_read_only
= false;
6384 fields
[i
].image_write_only
= true;
6386 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6387 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6390 /* For other qualifiers, we set the flag if either the layout
6391 * qualifier or the field qualifier are set
6393 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6394 layout
->flags
.q
.coherent
;
6395 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6396 layout
->flags
.q
._volatile
;
6397 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6398 layout
->flags
.q
.restrict_flag
;
6405 assert(i
== decl_count
);
6407 *fields_ret
= fields
;
6413 ast_struct_specifier::hir(exec_list
*instructions
,
6414 struct _mesa_glsl_parse_state
*state
)
6416 YYLTYPE loc
= this->get_location();
6418 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6420 * "Anonymous structures are not supported; so embedded structures must
6421 * have a declarator. A name given to an embedded struct is scoped at
6422 * the same level as the struct it is embedded in."
6424 * The same section of the GLSL 1.20 spec says:
6426 * "Anonymous structures are not supported. Embedded structures are not
6429 * struct S { float f; };
6431 * S; // Error: anonymous structures disallowed
6432 * struct { ... }; // Error: embedded structures disallowed
6433 * S s; // Okay: nested structures with name are allowed
6436 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
6437 * we allow embedded structures in 1.10 only.
6439 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
6440 _mesa_glsl_error(&loc
, state
,
6441 "embedded structure declarations are not allowed");
6443 state
->struct_specifier_depth
++;
6445 glsl_struct_field
*fields
;
6446 unsigned decl_count
=
6447 ast_process_struct_or_iface_block_members(instructions
,
6449 &this->declarations
,
6452 GLSL_MATRIX_LAYOUT_INHERITED
,
6453 false /* allow_reserved_names */,
6456 0 /* for interface only */);
6458 validate_identifier(this->name
, loc
, state
);
6460 const glsl_type
*t
=
6461 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6463 if (!state
->symbols
->add_type(name
, t
)) {
6464 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6466 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6468 state
->num_user_structures
+ 1);
6470 s
[state
->num_user_structures
] = t
;
6471 state
->user_structures
= s
;
6472 state
->num_user_structures
++;
6476 state
->struct_specifier_depth
--;
6478 /* Structure type definitions do not have r-values.
6485 * Visitor class which detects whether a given interface block has been used.
6487 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6490 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6491 : mode(mode
), block(block
), found(false)
6495 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6497 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6501 return visit_continue
;
6504 bool usage_found() const
6510 ir_variable_mode mode
;
6511 const glsl_type
*block
;
6516 is_unsized_array_last_element(ir_variable
*v
)
6518 const glsl_type
*interface_type
= v
->get_interface_type();
6519 int length
= interface_type
->length
;
6521 assert(v
->type
->is_unsized_array());
6523 /* Check if it is the last element of the interface */
6524 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6530 ast_interface_block::hir(exec_list
*instructions
,
6531 struct _mesa_glsl_parse_state
*state
)
6533 YYLTYPE loc
= this->get_location();
6535 /* Interface blocks must be declared at global scope */
6536 if (state
->current_function
!= NULL
) {
6537 _mesa_glsl_error(&loc
, state
,
6538 "Interface block `%s' must be declared "
6543 if (!this->layout
.flags
.q
.buffer
&&
6544 this->layout
.flags
.q
.std430
) {
6545 _mesa_glsl_error(&loc
, state
,
6546 "std430 storage block layout qualifier is supported "
6547 "only for shader storage blocks");
6550 /* The ast_interface_block has a list of ast_declarator_lists. We
6551 * need to turn those into ir_variables with an association
6552 * with this uniform block.
6554 enum glsl_interface_packing packing
;
6555 if (this->layout
.flags
.q
.shared
) {
6556 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6557 } else if (this->layout
.flags
.q
.packed
) {
6558 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6559 } else if (this->layout
.flags
.q
.std430
) {
6560 packing
= GLSL_INTERFACE_PACKING_STD430
;
6562 /* The default layout is std140.
6564 packing
= GLSL_INTERFACE_PACKING_STD140
;
6567 ir_variable_mode var_mode
;
6568 const char *iface_type_name
;
6569 if (this->layout
.flags
.q
.in
) {
6570 var_mode
= ir_var_shader_in
;
6571 iface_type_name
= "in";
6572 } else if (this->layout
.flags
.q
.out
) {
6573 var_mode
= ir_var_shader_out
;
6574 iface_type_name
= "out";
6575 } else if (this->layout
.flags
.q
.uniform
) {
6576 var_mode
= ir_var_uniform
;
6577 iface_type_name
= "uniform";
6578 } else if (this->layout
.flags
.q
.buffer
) {
6579 var_mode
= ir_var_shader_storage
;
6580 iface_type_name
= "buffer";
6582 var_mode
= ir_var_auto
;
6583 iface_type_name
= "UNKNOWN";
6584 assert(!"interface block layout qualifier not found!");
6587 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6588 if (this->layout
.flags
.q
.row_major
)
6589 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6590 else if (this->layout
.flags
.q
.column_major
)
6591 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6593 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6594 exec_list declared_variables
;
6595 glsl_struct_field
*fields
;
6597 /* Treat an interface block as one level of nesting, so that embedded struct
6598 * specifiers will be disallowed.
6600 state
->struct_specifier_depth
++;
6602 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
6603 * that we don't have incompatible qualifiers
6605 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
6606 _mesa_glsl_error(&loc
, state
,
6607 "Interface block sets both readonly and writeonly");
6610 unsigned qual_stream
;
6611 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
6613 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
6614 /* If the stream qualifier is invalid it doesn't make sense to continue
6615 * on and try to compare stream layouts on member variables against it
6616 * so just return early.
6621 unsigned int num_variables
=
6622 ast_process_struct_or_iface_block_members(&declared_variables
,
6624 &this->declarations
,
6628 redeclaring_per_vertex
,
6633 state
->struct_specifier_depth
--;
6635 if (!redeclaring_per_vertex
) {
6636 validate_identifier(this->block_name
, loc
, state
);
6638 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
6640 * "Block names have no other use within a shader beyond interface
6641 * matching; it is a compile-time error to use a block name at global
6642 * scope for anything other than as a block name."
6644 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
6645 if (var
&& !var
->type
->is_interface()) {
6646 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
6647 "already used in the scope.",
6652 const glsl_type
*earlier_per_vertex
= NULL
;
6653 if (redeclaring_per_vertex
) {
6654 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
6655 * the named interface block gl_in, we can find it by looking at the
6656 * previous declaration of gl_in. Otherwise we can find it by looking
6657 * at the previous decalartion of any of the built-in outputs,
6660 * Also check that the instance name and array-ness of the redeclaration
6664 case ir_var_shader_in
:
6665 if (ir_variable
*earlier_gl_in
=
6666 state
->symbols
->get_variable("gl_in")) {
6667 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6669 _mesa_glsl_error(&loc
, state
,
6670 "redeclaration of gl_PerVertex input not allowed "
6672 _mesa_shader_stage_to_string(state
->stage
));
6674 if (this->instance_name
== NULL
||
6675 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
6676 !this->array_specifier
->is_single_dimension()) {
6677 _mesa_glsl_error(&loc
, state
,
6678 "gl_PerVertex input must be redeclared as "
6682 case ir_var_shader_out
:
6683 if (ir_variable
*earlier_gl_Position
=
6684 state
->symbols
->get_variable("gl_Position")) {
6685 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6686 } else if (ir_variable
*earlier_gl_out
=
6687 state
->symbols
->get_variable("gl_out")) {
6688 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6690 _mesa_glsl_error(&loc
, state
,
6691 "redeclaration of gl_PerVertex output not "
6692 "allowed in the %s shader",
6693 _mesa_shader_stage_to_string(state
->stage
));
6695 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6696 if (this->instance_name
== NULL
||
6697 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6698 _mesa_glsl_error(&loc
, state
,
6699 "gl_PerVertex output must be redeclared as "
6703 if (this->instance_name
!= NULL
) {
6704 _mesa_glsl_error(&loc
, state
,
6705 "gl_PerVertex output may not be redeclared with "
6706 "an instance name");
6711 _mesa_glsl_error(&loc
, state
,
6712 "gl_PerVertex must be declared as an input or an "
6717 if (earlier_per_vertex
== NULL
) {
6718 /* An error has already been reported. Bail out to avoid null
6719 * dereferences later in this function.
6724 /* Copy locations from the old gl_PerVertex interface block. */
6725 for (unsigned i
= 0; i
< num_variables
; i
++) {
6726 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6728 _mesa_glsl_error(&loc
, state
,
6729 "redeclaration of gl_PerVertex must be a subset "
6730 "of the built-in members of gl_PerVertex");
6732 fields
[i
].location
=
6733 earlier_per_vertex
->fields
.structure
[j
].location
;
6734 fields
[i
].interpolation
=
6735 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6736 fields
[i
].centroid
=
6737 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6739 earlier_per_vertex
->fields
.structure
[j
].sample
;
6741 earlier_per_vertex
->fields
.structure
[j
].patch
;
6742 fields
[i
].precision
=
6743 earlier_per_vertex
->fields
.structure
[j
].precision
;
6747 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
6750 * If a built-in interface block is redeclared, it must appear in
6751 * the shader before any use of any member included in the built-in
6752 * declaration, or a compilation error will result.
6754 * This appears to be a clarification to the behaviour established for
6755 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
6756 * regardless of GLSL version.
6758 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
6759 v
.run(instructions
);
6760 if (v
.usage_found()) {
6761 _mesa_glsl_error(&loc
, state
,
6762 "redeclaration of a built-in interface block must "
6763 "appear before any use of any member of the "
6768 const glsl_type
*block_type
=
6769 glsl_type::get_interface_instance(fields
,
6774 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
6775 YYLTYPE loc
= this->get_location();
6776 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
6777 "already taken in the current scope",
6778 this->block_name
, iface_type_name
);
6781 /* Since interface blocks cannot contain statements, it should be
6782 * impossible for the block to generate any instructions.
6784 assert(declared_variables
.is_empty());
6786 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
6788 * Geometry shader input variables get the per-vertex values written
6789 * out by vertex shader output variables of the same names. Since a
6790 * geometry shader operates on a set of vertices, each input varying
6791 * variable (or input block, see interface blocks below) needs to be
6792 * declared as an array.
6794 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
6795 var_mode
== ir_var_shader_in
) {
6796 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
6797 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6798 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
6799 this->array_specifier
== NULL
&&
6800 var_mode
== ir_var_shader_in
) {
6801 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
6802 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
6803 this->array_specifier
== NULL
&&
6804 var_mode
== ir_var_shader_out
) {
6805 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
6809 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
6812 * "If an instance name (instance-name) is used, then it puts all the
6813 * members inside a scope within its own name space, accessed with the
6814 * field selector ( . ) operator (analogously to structures)."
6816 if (this->instance_name
) {
6817 if (redeclaring_per_vertex
) {
6818 /* When a built-in in an unnamed interface block is redeclared,
6819 * get_variable_being_redeclared() calls
6820 * check_builtin_array_max_size() to make sure that built-in array
6821 * variables aren't redeclared to illegal sizes. But we're looking
6822 * at a redeclaration of a named built-in interface block. So we
6823 * have to manually call check_builtin_array_max_size() for all parts
6824 * of the interface that are arrays.
6826 for (unsigned i
= 0; i
< num_variables
; i
++) {
6827 if (fields
[i
].type
->is_array()) {
6828 const unsigned size
= fields
[i
].type
->array_size();
6829 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
6833 validate_identifier(this->instance_name
, loc
, state
);
6838 if (this->array_specifier
!= NULL
) {
6839 const glsl_type
*block_array_type
=
6840 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
6842 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
6844 * For uniform blocks declared an array, each individual array
6845 * element corresponds to a separate buffer object backing one
6846 * instance of the block. As the array size indicates the number
6847 * of buffer objects needed, uniform block array declarations
6848 * must specify an array size.
6850 * And a few paragraphs later:
6852 * Geometry shader input blocks must be declared as arrays and
6853 * follow the array declaration and linking rules for all
6854 * geometry shader inputs. All other input and output block
6855 * arrays must specify an array size.
6857 * The same applies to tessellation shaders.
6859 * The upshot of this is that the only circumstance where an
6860 * interface array size *doesn't* need to be specified is on a
6861 * geometry shader input, tessellation control shader input,
6862 * tessellation control shader output, and tessellation evaluation
6865 if (block_array_type
->is_unsized_array()) {
6866 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
6867 state
->stage
== MESA_SHADER_TESS_CTRL
||
6868 state
->stage
== MESA_SHADER_TESS_EVAL
;
6869 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
6871 if (this->layout
.flags
.q
.in
) {
6873 _mesa_glsl_error(&loc
, state
,
6874 "unsized input block arrays not allowed in "
6876 _mesa_shader_stage_to_string(state
->stage
));
6877 } else if (this->layout
.flags
.q
.out
) {
6879 _mesa_glsl_error(&loc
, state
,
6880 "unsized output block arrays not allowed in "
6882 _mesa_shader_stage_to_string(state
->stage
));
6884 /* by elimination, this is a uniform block array */
6885 _mesa_glsl_error(&loc
, state
,
6886 "unsized uniform block arrays not allowed in "
6888 _mesa_shader_stage_to_string(state
->stage
));
6892 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
6894 * * Arrays of arrays of blocks are not allowed
6896 if (state
->es_shader
&& block_array_type
->is_array() &&
6897 block_array_type
->fields
.array
->is_array()) {
6898 _mesa_glsl_error(&loc
, state
,
6899 "arrays of arrays interface blocks are "
6903 var
= new(state
) ir_variable(block_array_type
,
6904 this->instance_name
,
6907 var
= new(state
) ir_variable(block_type
,
6908 this->instance_name
,
6912 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
6913 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
6915 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
6916 var
->data
.read_only
= true;
6918 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
6919 handle_geometry_shader_input_decl(state
, loc
, var
);
6920 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6921 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
6922 handle_tess_shader_input_decl(state
, loc
, var
);
6923 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
6924 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
6926 for (unsigned i
= 0; i
< num_variables
; i
++) {
6927 if (fields
[i
].type
->is_unsized_array()) {
6928 if (var_mode
== ir_var_shader_storage
) {
6929 if (i
!= (num_variables
- 1)) {
6930 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6931 "only last member of a shader storage block "
6932 "can be defined as unsized array",
6936 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
6938 * "If an array is declared as the last member of a shader storage
6939 * block and the size is not specified at compile-time, it is
6940 * sized at run-time. In all other cases, arrays are sized only
6943 if (state
->es_shader
) {
6944 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6945 "only last member of a shader storage block "
6946 "can be defined as unsized array",
6953 if (ir_variable
*earlier
=
6954 state
->symbols
->get_variable(this->instance_name
)) {
6955 if (!redeclaring_per_vertex
) {
6956 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
6957 this->instance_name
);
6959 earlier
->data
.how_declared
= ir_var_declared_normally
;
6960 earlier
->type
= var
->type
;
6961 earlier
->reinit_interface_type(block_type
);
6964 if (this->layout
.flags
.q
.explicit_binding
) {
6965 apply_explicit_binding(state
, &loc
, var
, var
->type
,
6969 var
->data
.stream
= qual_stream
;
6971 state
->symbols
->add_variable(var
);
6972 instructions
->push_tail(var
);
6975 /* In order to have an array size, the block must also be declared with
6978 assert(this->array_specifier
== NULL
);
6980 for (unsigned i
= 0; i
< num_variables
; i
++) {
6982 new(state
) ir_variable(fields
[i
].type
,
6983 ralloc_strdup(state
, fields
[i
].name
),
6985 var
->data
.interpolation
= fields
[i
].interpolation
;
6986 var
->data
.centroid
= fields
[i
].centroid
;
6987 var
->data
.sample
= fields
[i
].sample
;
6988 var
->data
.patch
= fields
[i
].patch
;
6989 var
->data
.stream
= qual_stream
;
6990 var
->init_interface_type(block_type
);
6992 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
6993 var
->data
.read_only
= true;
6995 /* Precision qualifiers do not have any meaning in Desktop GLSL */
6996 if (state
->es_shader
) {
6997 var
->data
.precision
=
6998 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7002 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7003 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7004 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7006 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7009 if (var
->data
.mode
== ir_var_shader_storage
) {
7010 var
->data
.image_read_only
= fields
[i
].image_read_only
;
7011 var
->data
.image_write_only
= fields
[i
].image_write_only
;
7012 var
->data
.image_coherent
= fields
[i
].image_coherent
;
7013 var
->data
.image_volatile
= fields
[i
].image_volatile
;
7014 var
->data
.image_restrict
= fields
[i
].image_restrict
;
7017 /* Examine var name here since var may get deleted in the next call */
7018 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7020 if (redeclaring_per_vertex
) {
7021 ir_variable
*earlier
=
7022 get_variable_being_redeclared(var
, loc
, state
,
7023 true /* allow_all_redeclarations */);
7024 if (!var_is_gl_id
|| earlier
== NULL
) {
7025 _mesa_glsl_error(&loc
, state
,
7026 "redeclaration of gl_PerVertex can only "
7027 "include built-in variables");
7028 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7029 _mesa_glsl_error(&loc
, state
,
7030 "`%s' has already been redeclared",
7033 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7034 earlier
->reinit_interface_type(block_type
);
7039 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7040 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7042 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7043 * The UBO declaration itself doesn't get an ir_variable unless it
7044 * has an instance name. This is ugly.
7046 if (this->layout
.flags
.q
.explicit_binding
) {
7047 apply_explicit_binding(state
, &loc
, var
,
7048 var
->get_interface_type(), &this->layout
);
7051 if (var
->type
->is_unsized_array()) {
7052 if (var
->is_in_shader_storage_block()) {
7053 if (!is_unsized_array_last_element(var
)) {
7054 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7055 "only last member of a shader storage block "
7056 "can be defined as unsized array",
7059 var
->data
.from_ssbo_unsized_array
= true;
7061 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7063 * "If an array is declared as the last member of a shader storage
7064 * block and the size is not specified at compile-time, it is
7065 * sized at run-time. In all other cases, arrays are sized only
7068 if (state
->es_shader
) {
7069 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7070 "only last member of a shader storage block "
7071 "can be defined as unsized array",
7077 state
->symbols
->add_variable(var
);
7078 instructions
->push_tail(var
);
7081 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7082 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7084 * It is also a compilation error ... to redeclare a built-in
7085 * block and then use a member from that built-in block that was
7086 * not included in the redeclaration.
7088 * This appears to be a clarification to the behaviour established
7089 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7090 * behaviour regardless of GLSL version.
7092 * To prevent the shader from using a member that was not included in
7093 * the redeclaration, we disable any ir_variables that are still
7094 * associated with the old declaration of gl_PerVertex (since we've
7095 * already updated all of the variables contained in the new
7096 * gl_PerVertex to point to it).
7098 * As a side effect this will prevent
7099 * validate_intrastage_interface_blocks() from getting confused and
7100 * thinking there are conflicting definitions of gl_PerVertex in the
7103 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7104 ir_variable
*const var
= node
->as_variable();
7106 var
->get_interface_type() == earlier_per_vertex
&&
7107 var
->data
.mode
== var_mode
) {
7108 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7109 _mesa_glsl_error(&loc
, state
,
7110 "redeclaration of gl_PerVertex cannot "
7111 "follow a redeclaration of `%s'",
7114 state
->symbols
->disable_variable(var
->name
);
7126 ast_tcs_output_layout::hir(exec_list
*instructions
,
7127 struct _mesa_glsl_parse_state
*state
)
7129 YYLTYPE loc
= this->get_location();
7131 unsigned num_vertices
;
7132 if (!state
->out_qualifier
->vertices
->
7133 process_qualifier_constant(state
, "vertices", &num_vertices
,
7135 /* return here to stop cascading incorrect error messages */
7139 /* If any shader outputs occurred before this declaration and specified an
7140 * array size, make sure the size they specified is consistent with the
7143 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7144 _mesa_glsl_error(&loc
, state
,
7145 "this tessellation control shader output layout "
7146 "specifies %u vertices, but a previous output "
7147 "is declared with size %u",
7148 num_vertices
, state
->tcs_output_size
);
7152 state
->tcs_output_vertices_specified
= true;
7154 /* If any shader outputs occurred before this declaration and did not
7155 * specify an array size, their size is determined now.
7157 foreach_in_list (ir_instruction
, node
, instructions
) {
7158 ir_variable
*var
= node
->as_variable();
7159 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7162 /* Note: Not all tessellation control shader output are arrays. */
7163 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7166 if (var
->data
.max_array_access
>= num_vertices
) {
7167 _mesa_glsl_error(&loc
, state
,
7168 "this tessellation control shader output layout "
7169 "specifies %u vertices, but an access to element "
7170 "%u of output `%s' already exists", num_vertices
,
7171 var
->data
.max_array_access
, var
->name
);
7173 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7183 ast_gs_input_layout::hir(exec_list
*instructions
,
7184 struct _mesa_glsl_parse_state
*state
)
7186 YYLTYPE loc
= this->get_location();
7188 /* If any geometry input layout declaration preceded this one, make sure it
7189 * was consistent with this one.
7191 if (state
->gs_input_prim_type_specified
&&
7192 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7193 _mesa_glsl_error(&loc
, state
,
7194 "geometry shader input layout does not match"
7195 " previous declaration");
7199 /* If any shader inputs occurred before this declaration and specified an
7200 * array size, make sure the size they specified is consistent with the
7203 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7204 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7205 _mesa_glsl_error(&loc
, state
,
7206 "this geometry shader input layout implies %u vertices"
7207 " per primitive, but a previous input is declared"
7208 " with size %u", num_vertices
, state
->gs_input_size
);
7212 state
->gs_input_prim_type_specified
= true;
7214 /* If any shader inputs occurred before this declaration and did not
7215 * specify an array size, their size is determined now.
7217 foreach_in_list(ir_instruction
, node
, instructions
) {
7218 ir_variable
*var
= node
->as_variable();
7219 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7222 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7226 if (var
->type
->is_unsized_array()) {
7227 if (var
->data
.max_array_access
>= num_vertices
) {
7228 _mesa_glsl_error(&loc
, state
,
7229 "this geometry shader input layout implies %u"
7230 " vertices, but an access to element %u of input"
7231 " `%s' already exists", num_vertices
,
7232 var
->data
.max_array_access
, var
->name
);
7234 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7245 ast_cs_input_layout::hir(exec_list
*instructions
,
7246 struct _mesa_glsl_parse_state
*state
)
7248 YYLTYPE loc
= this->get_location();
7250 /* From the ARB_compute_shader specification:
7252 * If the local size of the shader in any dimension is greater
7253 * than the maximum size supported by the implementation for that
7254 * dimension, a compile-time error results.
7256 * It is not clear from the spec how the error should be reported if
7257 * the total size of the work group exceeds
7258 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7259 * report it at compile time as well.
7261 GLuint64 total_invocations
= 1;
7262 unsigned qual_local_size
[3];
7263 for (int i
= 0; i
< 3; i
++) {
7265 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7267 /* Infer a local_size of 1 for unspecified dimensions */
7268 if (this->local_size
[i
] == NULL
) {
7269 qual_local_size
[i
] = 1;
7270 } else if (!this->local_size
[i
]->
7271 process_qualifier_constant(state
, local_size_str
,
7272 &qual_local_size
[i
], false)) {
7273 ralloc_free(local_size_str
);
7276 ralloc_free(local_size_str
);
7278 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7279 _mesa_glsl_error(&loc
, state
,
7280 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7282 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7285 total_invocations
*= qual_local_size
[i
];
7286 if (total_invocations
>
7287 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7288 _mesa_glsl_error(&loc
, state
,
7289 "product of local_sizes exceeds "
7290 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7291 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7296 /* If any compute input layout declaration preceded this one, make sure it
7297 * was consistent with this one.
7299 if (state
->cs_input_local_size_specified
) {
7300 for (int i
= 0; i
< 3; i
++) {
7301 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7302 _mesa_glsl_error(&loc
, state
,
7303 "compute shader input layout does not match"
7304 " previous declaration");
7310 state
->cs_input_local_size_specified
= true;
7311 for (int i
= 0; i
< 3; i
++)
7312 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7314 /* We may now declare the built-in constant gl_WorkGroupSize (see
7315 * builtin_variable_generator::generate_constants() for why we didn't
7316 * declare it earlier).
7318 ir_variable
*var
= new(state
->symbols
)
7319 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7320 var
->data
.how_declared
= ir_var_declared_implicitly
;
7321 var
->data
.read_only
= true;
7322 instructions
->push_tail(var
);
7323 state
->symbols
->add_variable(var
);
7324 ir_constant_data data
;
7325 memset(&data
, 0, sizeof(data
));
7326 for (int i
= 0; i
< 3; i
++)
7327 data
.u
[i
] = qual_local_size
[i
];
7328 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7329 var
->constant_initializer
=
7330 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7331 var
->data
.has_initializer
= true;
7338 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7339 exec_list
*instructions
)
7341 bool gl_FragColor_assigned
= false;
7342 bool gl_FragData_assigned
= false;
7343 bool gl_FragSecondaryColor_assigned
= false;
7344 bool gl_FragSecondaryData_assigned
= false;
7345 bool user_defined_fs_output_assigned
= false;
7346 ir_variable
*user_defined_fs_output
= NULL
;
7348 /* It would be nice to have proper location information. */
7350 memset(&loc
, 0, sizeof(loc
));
7352 foreach_in_list(ir_instruction
, node
, instructions
) {
7353 ir_variable
*var
= node
->as_variable();
7355 if (!var
|| !var
->data
.assigned
)
7358 if (strcmp(var
->name
, "gl_FragColor") == 0)
7359 gl_FragColor_assigned
= true;
7360 else if (strcmp(var
->name
, "gl_FragData") == 0)
7361 gl_FragData_assigned
= true;
7362 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7363 gl_FragSecondaryColor_assigned
= true;
7364 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7365 gl_FragSecondaryData_assigned
= true;
7366 else if (!is_gl_identifier(var
->name
)) {
7367 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7368 var
->data
.mode
== ir_var_shader_out
) {
7369 user_defined_fs_output_assigned
= true;
7370 user_defined_fs_output
= var
;
7375 /* From the GLSL 1.30 spec:
7377 * "If a shader statically assigns a value to gl_FragColor, it
7378 * may not assign a value to any element of gl_FragData. If a
7379 * shader statically writes a value to any element of
7380 * gl_FragData, it may not assign a value to
7381 * gl_FragColor. That is, a shader may assign values to either
7382 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7383 * linked together must also consistently write just one of
7384 * these variables. Similarly, if user declared output
7385 * variables are in use (statically assigned to), then the
7386 * built-in variables gl_FragColor and gl_FragData may not be
7387 * assigned to. These incorrect usages all generate compile
7390 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7391 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7392 "`gl_FragColor' and `gl_FragData'");
7393 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7394 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7395 "`gl_FragColor' and `%s'",
7396 user_defined_fs_output
->name
);
7397 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7398 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7399 "`gl_FragSecondaryColorEXT' and"
7400 " `gl_FragSecondaryDataEXT'");
7401 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7402 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7403 "`gl_FragColor' and"
7404 " `gl_FragSecondaryDataEXT'");
7405 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7406 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7408 " `gl_FragSecondaryColorEXT'");
7409 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7410 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7411 "`gl_FragData' and `%s'",
7412 user_defined_fs_output
->name
);
7415 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7416 !state
->EXT_blend_func_extended_enable
) {
7417 _mesa_glsl_error(&loc
, state
,
7418 "Dual source blending requires EXT_blend_func_extended");
7424 remove_per_vertex_blocks(exec_list
*instructions
,
7425 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7427 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7428 * if it exists in this shader type.
7430 const glsl_type
*per_vertex
= NULL
;
7432 case ir_var_shader_in
:
7433 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7434 per_vertex
= gl_in
->get_interface_type();
7436 case ir_var_shader_out
:
7437 if (ir_variable
*gl_Position
=
7438 state
->symbols
->get_variable("gl_Position")) {
7439 per_vertex
= gl_Position
->get_interface_type();
7443 assert(!"Unexpected mode");
7447 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7448 * need to do anything.
7450 if (per_vertex
== NULL
)
7453 /* If the interface block is used by the shader, then we don't need to do
7456 interface_block_usage_visitor
v(mode
, per_vertex
);
7457 v
.run(instructions
);
7458 if (v
.usage_found())
7461 /* Remove any ir_variable declarations that refer to the interface block
7464 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7465 ir_variable
*const var
= node
->as_variable();
7466 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
7467 var
->data
.mode
== mode
) {
7468 state
->symbols
->disable_variable(var
->name
);