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) ||
2653 state
->ARB_shading_language_420pack_enable
) &&
2654 base_type
->is_image()) {
2655 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2656 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2657 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2658 " maximum number of image units (%d)", max_index
,
2659 ctx
->Const
.MaxImageUnits
);
2664 _mesa_glsl_error(loc
, state
,
2665 "the \"binding\" qualifier only applies to uniform "
2666 "blocks, opaque variables, or arrays thereof");
2670 var
->data
.explicit_binding
= true;
2671 var
->data
.binding
= qual_binding
;
2677 static glsl_interp_qualifier
2678 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2679 ir_variable_mode mode
,
2680 struct _mesa_glsl_parse_state
*state
,
2683 glsl_interp_qualifier interpolation
;
2684 if (qual
->flags
.q
.flat
)
2685 interpolation
= INTERP_QUALIFIER_FLAT
;
2686 else if (qual
->flags
.q
.noperspective
)
2687 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2688 else if (qual
->flags
.q
.smooth
)
2689 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2691 interpolation
= INTERP_QUALIFIER_NONE
;
2693 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2694 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2695 _mesa_glsl_error(loc
, state
,
2696 "interpolation qualifier `%s' can only be applied to "
2697 "shader inputs or outputs.",
2698 interpolation_string(interpolation
));
2702 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2703 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2704 _mesa_glsl_error(loc
, state
,
2705 "interpolation qualifier `%s' cannot be applied to "
2706 "vertex shader inputs or fragment shader outputs",
2707 interpolation_string(interpolation
));
2711 return interpolation
;
2716 apply_explicit_location(const struct ast_type_qualifier
*qual
,
2718 struct _mesa_glsl_parse_state
*state
,
2723 unsigned qual_location
;
2724 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
2729 /* Checks for GL_ARB_explicit_uniform_location. */
2730 if (qual
->flags
.q
.uniform
) {
2731 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2734 const struct gl_context
*const ctx
= state
->ctx
;
2735 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
2737 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2738 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2739 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2740 ctx
->Const
.MaxUserAssignableUniformLocations
);
2744 var
->data
.explicit_location
= true;
2745 var
->data
.location
= qual_location
;
2749 /* Between GL_ARB_explicit_attrib_location an
2750 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2751 * stage can be assigned explicit locations. The checking here associates
2752 * the correct extension with the correct stage's input / output:
2756 * vertex explicit_loc sso
2757 * tess control sso sso
2760 * fragment sso explicit_loc
2762 switch (state
->stage
) {
2763 case MESA_SHADER_VERTEX
:
2764 if (var
->data
.mode
== ir_var_shader_in
) {
2765 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2771 if (var
->data
.mode
== ir_var_shader_out
) {
2772 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2781 case MESA_SHADER_TESS_CTRL
:
2782 case MESA_SHADER_TESS_EVAL
:
2783 case MESA_SHADER_GEOMETRY
:
2784 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2785 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2794 case MESA_SHADER_FRAGMENT
:
2795 if (var
->data
.mode
== ir_var_shader_in
) {
2796 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2802 if (var
->data
.mode
== ir_var_shader_out
) {
2803 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2812 case MESA_SHADER_COMPUTE
:
2813 _mesa_glsl_error(loc
, state
,
2814 "compute shader variables cannot be given "
2815 "explicit locations");
2820 _mesa_glsl_error(loc
, state
,
2821 "%s cannot be given an explicit location in %s shader",
2823 _mesa_shader_stage_to_string(state
->stage
));
2825 var
->data
.explicit_location
= true;
2827 switch (state
->stage
) {
2828 case MESA_SHADER_VERTEX
:
2829 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2830 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
2831 : (qual_location
+ VARYING_SLOT_VAR0
);
2834 case MESA_SHADER_TESS_CTRL
:
2835 case MESA_SHADER_TESS_EVAL
:
2836 case MESA_SHADER_GEOMETRY
:
2837 if (var
->data
.patch
)
2838 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
2840 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
2843 case MESA_SHADER_FRAGMENT
:
2844 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2845 ? (qual_location
+ FRAG_RESULT_DATA0
)
2846 : (qual_location
+ VARYING_SLOT_VAR0
);
2848 case MESA_SHADER_COMPUTE
:
2849 assert(!"Unexpected shader type");
2853 /* Check if index was set for the uniform instead of the function */
2854 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
2855 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
2856 "used with subroutine functions");
2860 unsigned qual_index
;
2861 if (qual
->flags
.q
.explicit_index
&&
2862 process_qualifier_constant(state
, loc
, "index", qual
->index
,
2864 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2865 * Layout Qualifiers):
2867 * "It is also a compile-time error if a fragment shader
2868 * sets a layout index to less than 0 or greater than 1."
2870 * Older specifications don't mandate a behavior; we take
2871 * this as a clarification and always generate the error.
2873 if (qual_index
> 1) {
2874 _mesa_glsl_error(loc
, state
,
2875 "explicit index may only be 0 or 1");
2877 var
->data
.explicit_index
= true;
2878 var
->data
.index
= qual_index
;
2885 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2887 struct _mesa_glsl_parse_state
*state
,
2890 const glsl_type
*base_type
= var
->type
->without_array();
2892 if (base_type
->is_image()) {
2893 if (var
->data
.mode
!= ir_var_uniform
&&
2894 var
->data
.mode
!= ir_var_function_in
) {
2895 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2896 "function parameters or uniform-qualified "
2897 "global variables");
2900 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2901 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2902 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2903 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2904 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2905 var
->data
.read_only
= true;
2907 if (qual
->flags
.q
.explicit_image_format
) {
2908 if (var
->data
.mode
== ir_var_function_in
) {
2909 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2910 "used on image function parameters");
2913 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2914 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2915 "base data type of the image");
2918 var
->data
.image_format
= qual
->image_format
;
2920 if (var
->data
.mode
== ir_var_uniform
) {
2921 if (state
->es_shader
) {
2922 _mesa_glsl_error(loc
, state
, "all image uniforms "
2923 "must have a format layout qualifier");
2925 } else if (!qual
->flags
.q
.write_only
) {
2926 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
2927 "`writeonly' must have a format layout "
2932 var
->data
.image_format
= GL_NONE
;
2935 /* From page 70 of the GLSL ES 3.1 specification:
2937 * "Except for image variables qualified with the format qualifiers
2938 * r32f, r32i, and r32ui, image variables must specify either memory
2939 * qualifier readonly or the memory qualifier writeonly."
2941 if (state
->es_shader
&&
2942 var
->data
.image_format
!= GL_R32F
&&
2943 var
->data
.image_format
!= GL_R32I
&&
2944 var
->data
.image_format
!= GL_R32UI
&&
2945 !var
->data
.image_read_only
&&
2946 !var
->data
.image_write_only
) {
2947 _mesa_glsl_error(loc
, state
, "image variables of format other than "
2948 "r32f, r32i or r32ui must be qualified `readonly' or "
2952 } else if (qual
->flags
.q
.read_only
||
2953 qual
->flags
.q
.write_only
||
2954 qual
->flags
.q
.coherent
||
2955 qual
->flags
.q
._volatile
||
2956 qual
->flags
.q
.restrict_flag
||
2957 qual
->flags
.q
.explicit_image_format
) {
2958 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
2963 static inline const char*
2964 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
2966 if (origin_upper_left
&& pixel_center_integer
)
2967 return "origin_upper_left, pixel_center_integer";
2968 else if (origin_upper_left
)
2969 return "origin_upper_left";
2970 else if (pixel_center_integer
)
2971 return "pixel_center_integer";
2977 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
2978 const struct ast_type_qualifier
*qual
)
2980 /* If gl_FragCoord was previously declared, and the qualifiers were
2981 * different in any way, return true.
2983 if (state
->fs_redeclares_gl_fragcoord
) {
2984 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
2985 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
2992 validate_array_dimensions(const glsl_type
*t
,
2993 struct _mesa_glsl_parse_state
*state
,
2995 if (t
->is_array()) {
2996 t
= t
->fields
.array
;
2997 while (t
->is_array()) {
2998 if (t
->is_unsized_array()) {
2999 _mesa_glsl_error(loc
, state
,
3000 "only the outermost array dimension can "
3005 t
= t
->fields
.array
;
3011 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3013 struct _mesa_glsl_parse_state
*state
,
3016 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3018 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3020 * "Within any shader, the first redeclarations of gl_FragCoord
3021 * must appear before any use of gl_FragCoord."
3023 * Generate a compiler error if above condition is not met by the
3026 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3027 if (earlier
!= NULL
&&
3028 earlier
->data
.used
&&
3029 !state
->fs_redeclares_gl_fragcoord
) {
3030 _mesa_glsl_error(loc
, state
,
3031 "gl_FragCoord used before its first redeclaration "
3032 "in fragment shader");
3035 /* Make sure all gl_FragCoord redeclarations specify the same layout
3038 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3039 const char *const qual_string
=
3040 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3041 qual
->flags
.q
.pixel_center_integer
);
3043 const char *const state_string
=
3044 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3045 state
->fs_pixel_center_integer
);
3047 _mesa_glsl_error(loc
, state
,
3048 "gl_FragCoord redeclared with different layout "
3049 "qualifiers (%s) and (%s) ",
3053 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3054 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3055 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3056 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3057 state
->fs_redeclares_gl_fragcoord
=
3058 state
->fs_origin_upper_left
||
3059 state
->fs_pixel_center_integer
||
3060 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3063 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3064 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3065 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3066 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3067 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3068 ? "origin_upper_left" : "pixel_center_integer";
3070 _mesa_glsl_error(loc
, state
,
3071 "layout qualifier `%s' can only be applied to "
3072 "fragment shader input `gl_FragCoord'",
3076 if (qual
->flags
.q
.explicit_location
) {
3077 apply_explicit_location(qual
, var
, state
, loc
);
3078 } else if (qual
->flags
.q
.explicit_index
) {
3079 if (!qual
->flags
.q
.subroutine_def
)
3080 _mesa_glsl_error(loc
, state
,
3081 "explicit index requires explicit location");
3084 if (qual
->flags
.q
.explicit_binding
) {
3085 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3088 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3089 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3090 unsigned qual_stream
;
3091 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3093 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3094 var
->data
.stream
= qual_stream
;
3098 if (var
->type
->contains_atomic()) {
3099 if (var
->data
.mode
== ir_var_uniform
) {
3100 if (var
->data
.explicit_binding
) {
3102 &state
->atomic_counter_offsets
[var
->data
.binding
];
3104 if (*offset
% ATOMIC_COUNTER_SIZE
)
3105 _mesa_glsl_error(loc
, state
,
3106 "misaligned atomic counter offset");
3108 var
->data
.atomic
.offset
= *offset
;
3109 *offset
+= var
->type
->atomic_size();
3112 _mesa_glsl_error(loc
, state
,
3113 "atomic counters require explicit binding point");
3115 } else if (var
->data
.mode
!= ir_var_function_in
) {
3116 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3117 "function parameters or uniform-qualified "
3118 "global variables");
3122 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3123 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3124 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3125 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3126 * These extensions and all following extensions that add the 'layout'
3127 * keyword have been modified to require the use of 'in' or 'out'.
3129 * The following extension do not allow the deprecated keywords:
3131 * GL_AMD_conservative_depth
3132 * GL_ARB_conservative_depth
3133 * GL_ARB_gpu_shader5
3134 * GL_ARB_separate_shader_objects
3135 * GL_ARB_tessellation_shader
3136 * GL_ARB_transform_feedback3
3137 * GL_ARB_uniform_buffer_object
3139 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3140 * allow layout with the deprecated keywords.
3142 const bool relaxed_layout_qualifier_checking
=
3143 state
->ARB_fragment_coord_conventions_enable
;
3145 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3146 || qual
->flags
.q
.varying
;
3147 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3148 if (relaxed_layout_qualifier_checking
) {
3149 _mesa_glsl_warning(loc
, state
,
3150 "`layout' qualifier may not be used with "
3151 "`attribute' or `varying'");
3153 _mesa_glsl_error(loc
, state
,
3154 "`layout' qualifier may not be used with "
3155 "`attribute' or `varying'");
3159 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3160 * AMD_conservative_depth.
3162 int depth_layout_count
= qual
->flags
.q
.depth_any
3163 + qual
->flags
.q
.depth_greater
3164 + qual
->flags
.q
.depth_less
3165 + qual
->flags
.q
.depth_unchanged
;
3166 if (depth_layout_count
> 0
3167 && !state
->AMD_conservative_depth_enable
3168 && !state
->ARB_conservative_depth_enable
) {
3169 _mesa_glsl_error(loc
, state
,
3170 "extension GL_AMD_conservative_depth or "
3171 "GL_ARB_conservative_depth must be enabled "
3172 "to use depth layout qualifiers");
3173 } else if (depth_layout_count
> 0
3174 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3175 _mesa_glsl_error(loc
, state
,
3176 "depth layout qualifiers can be applied only to "
3178 } else if (depth_layout_count
> 1
3179 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3180 _mesa_glsl_error(loc
, state
,
3181 "at most one depth layout qualifier can be applied to "
3184 if (qual
->flags
.q
.depth_any
)
3185 var
->data
.depth_layout
= ir_depth_layout_any
;
3186 else if (qual
->flags
.q
.depth_greater
)
3187 var
->data
.depth_layout
= ir_depth_layout_greater
;
3188 else if (qual
->flags
.q
.depth_less
)
3189 var
->data
.depth_layout
= ir_depth_layout_less
;
3190 else if (qual
->flags
.q
.depth_unchanged
)
3191 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3193 var
->data
.depth_layout
= ir_depth_layout_none
;
3195 if (qual
->flags
.q
.std140
||
3196 qual
->flags
.q
.std430
||
3197 qual
->flags
.q
.packed
||
3198 qual
->flags
.q
.shared
) {
3199 _mesa_glsl_error(loc
, state
,
3200 "uniform and shader storage block layout qualifiers "
3201 "std140, std430, packed, and shared can only be "
3202 "applied to uniform or shader storage blocks, not "
3206 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3207 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3210 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3213 * "Fragment shaders also allow the following layout qualifier on in only
3214 * (not with variable declarations)
3215 * layout-qualifier-id
3216 * early_fragment_tests
3219 if (qual
->flags
.q
.early_fragment_tests
) {
3220 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3221 "valid in fragment shader input layout declaration.");
3226 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3228 struct _mesa_glsl_parse_state
*state
,
3232 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3234 if (qual
->flags
.q
.invariant
) {
3235 if (var
->data
.used
) {
3236 _mesa_glsl_error(loc
, state
,
3237 "variable `%s' may not be redeclared "
3238 "`invariant' after being used",
3241 var
->data
.invariant
= 1;
3245 if (qual
->flags
.q
.precise
) {
3246 if (var
->data
.used
) {
3247 _mesa_glsl_error(loc
, state
,
3248 "variable `%s' may not be redeclared "
3249 "`precise' after being used",
3252 var
->data
.precise
= 1;
3256 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3257 _mesa_glsl_error(loc
, state
,
3258 "`subroutine' may only be applied to uniforms, "
3259 "subroutine type declarations, or function definitions");
3262 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3263 || qual
->flags
.q
.uniform
3264 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3265 var
->data
.read_only
= 1;
3267 if (qual
->flags
.q
.centroid
)
3268 var
->data
.centroid
= 1;
3270 if (qual
->flags
.q
.sample
)
3271 var
->data
.sample
= 1;
3273 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3274 if (state
->es_shader
) {
3275 var
->data
.precision
=
3276 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3279 if (qual
->flags
.q
.patch
)
3280 var
->data
.patch
= 1;
3282 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3283 var
->type
= glsl_type::error_type
;
3284 _mesa_glsl_error(loc
, state
,
3285 "`attribute' variables may not be declared in the "
3287 _mesa_shader_stage_to_string(state
->stage
));
3290 /* Disallow layout qualifiers which may only appear on layout declarations. */
3291 if (qual
->flags
.q
.prim_type
) {
3292 _mesa_glsl_error(loc
, state
,
3293 "Primitive type may only be specified on GS input or output "
3294 "layout declaration, not on variables.");
3297 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3299 * "However, the const qualifier cannot be used with out or inout."
3301 * The same section of the GLSL 4.40 spec further clarifies this saying:
3303 * "The const qualifier cannot be used with out or inout, or a
3304 * compile-time error results."
3306 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3307 _mesa_glsl_error(loc
, state
,
3308 "`const' may not be applied to `out' or `inout' "
3309 "function parameters");
3312 /* If there is no qualifier that changes the mode of the variable, leave
3313 * the setting alone.
3315 assert(var
->data
.mode
!= ir_var_temporary
);
3316 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3317 var
->data
.mode
= ir_var_function_inout
;
3318 else if (qual
->flags
.q
.in
)
3319 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3320 else if (qual
->flags
.q
.attribute
3321 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3322 var
->data
.mode
= ir_var_shader_in
;
3323 else if (qual
->flags
.q
.out
)
3324 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3325 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3326 var
->data
.mode
= ir_var_shader_out
;
3327 else if (qual
->flags
.q
.uniform
)
3328 var
->data
.mode
= ir_var_uniform
;
3329 else if (qual
->flags
.q
.buffer
)
3330 var
->data
.mode
= ir_var_shader_storage
;
3331 else if (qual
->flags
.q
.shared_storage
)
3332 var
->data
.mode
= ir_var_shader_shared
;
3334 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3335 /* User-defined ins/outs are not permitted in compute shaders. */
3336 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3337 _mesa_glsl_error(loc
, state
,
3338 "user-defined input and output variables are not "
3339 "permitted in compute shaders");
3342 /* This variable is being used to link data between shader stages (in
3343 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3344 * that is allowed for such purposes.
3346 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3348 * "The varying qualifier can be used only with the data types
3349 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3352 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3353 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3355 * "Fragment inputs can only be signed and unsigned integers and
3356 * integer vectors, float, floating-point vectors, matrices, or
3357 * arrays of these. Structures cannot be input.
3359 * Similar text exists in the section on vertex shader outputs.
3361 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3362 * 3.00 spec allows structs as well. Varying structs are also allowed
3365 switch (var
->type
->get_scalar_type()->base_type
) {
3366 case GLSL_TYPE_FLOAT
:
3367 /* Ok in all GLSL versions */
3369 case GLSL_TYPE_UINT
:
3371 if (state
->is_version(130, 300))
3373 _mesa_glsl_error(loc
, state
,
3374 "varying variables must be of base type float in %s",
3375 state
->get_version_string());
3377 case GLSL_TYPE_STRUCT
:
3378 if (state
->is_version(150, 300))
3380 _mesa_glsl_error(loc
, state
,
3381 "varying variables may not be of type struct");
3383 case GLSL_TYPE_DOUBLE
:
3386 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3391 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3392 switch (state
->stage
) {
3393 case MESA_SHADER_VERTEX
:
3394 if (var
->data
.mode
== ir_var_shader_out
)
3395 var
->data
.invariant
= true;
3397 case MESA_SHADER_TESS_CTRL
:
3398 case MESA_SHADER_TESS_EVAL
:
3399 case MESA_SHADER_GEOMETRY
:
3400 if ((var
->data
.mode
== ir_var_shader_in
)
3401 || (var
->data
.mode
== ir_var_shader_out
))
3402 var
->data
.invariant
= true;
3404 case MESA_SHADER_FRAGMENT
:
3405 if (var
->data
.mode
== ir_var_shader_in
)
3406 var
->data
.invariant
= true;
3408 case MESA_SHADER_COMPUTE
:
3409 /* Invariance isn't meaningful in compute shaders. */
3414 var
->data
.interpolation
=
3415 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
3418 /* Does the declaration use the deprecated 'attribute' or 'varying'
3421 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3422 || qual
->flags
.q
.varying
;
3425 /* Validate auxiliary storage qualifiers */
3427 /* From section 4.3.4 of the GLSL 1.30 spec:
3428 * "It is an error to use centroid in in a vertex shader."
3430 * From section 4.3.4 of the GLSL ES 3.00 spec:
3431 * "It is an error to use centroid in or interpolation qualifiers in
3432 * a vertex shader input."
3435 /* Section 4.3.6 of the GLSL 1.30 specification states:
3436 * "It is an error to use centroid out in a fragment shader."
3438 * The GL_ARB_shading_language_420pack extension specification states:
3439 * "It is an error to use auxiliary storage qualifiers or interpolation
3440 * qualifiers on an output in a fragment shader."
3442 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3443 _mesa_glsl_error(loc
, state
,
3444 "sample qualifier may only be used on `in` or `out` "
3445 "variables between shader stages");
3447 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3448 _mesa_glsl_error(loc
, state
,
3449 "centroid qualifier may only be used with `in', "
3450 "`out' or `varying' variables between shader stages");
3453 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3454 _mesa_glsl_error(loc
, state
,
3455 "the shared storage qualifiers can only be used with "
3459 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3463 * Get the variable that is being redeclared by this declaration
3465 * Semantic checks to verify the validity of the redeclaration are also
3466 * performed. If semantic checks fail, compilation error will be emitted via
3467 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3470 * A pointer to an existing variable in the current scope if the declaration
3471 * is a redeclaration, \c NULL otherwise.
3473 static ir_variable
*
3474 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3475 struct _mesa_glsl_parse_state
*state
,
3476 bool allow_all_redeclarations
)
3478 /* Check if this declaration is actually a re-declaration, either to
3479 * resize an array or add qualifiers to an existing variable.
3481 * This is allowed for variables in the current scope, or when at
3482 * global scope (for built-ins in the implicit outer scope).
3484 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3485 if (earlier
== NULL
||
3486 (state
->current_function
!= NULL
&&
3487 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3492 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3494 * "It is legal to declare an array without a size and then
3495 * later re-declare the same name as an array of the same
3496 * type and specify a size."
3498 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3499 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3500 /* FINISHME: This doesn't match the qualifiers on the two
3501 * FINISHME: declarations. It's not 100% clear whether this is
3502 * FINISHME: required or not.
3505 const unsigned size
= unsigned(var
->type
->array_size());
3506 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3507 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3508 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3510 earlier
->data
.max_array_access
);
3513 earlier
->type
= var
->type
;
3516 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3517 state
->is_version(150, 0))
3518 && strcmp(var
->name
, "gl_FragCoord") == 0
3519 && earlier
->type
== var
->type
3520 && earlier
->data
.mode
== var
->data
.mode
) {
3521 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3524 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3525 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3527 /* According to section 4.3.7 of the GLSL 1.30 spec,
3528 * the following built-in varaibles can be redeclared with an
3529 * interpolation qualifier:
3532 * * gl_FrontSecondaryColor
3533 * * gl_BackSecondaryColor
3535 * * gl_SecondaryColor
3537 } else if (state
->is_version(130, 0)
3538 && (strcmp(var
->name
, "gl_FrontColor") == 0
3539 || strcmp(var
->name
, "gl_BackColor") == 0
3540 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3541 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3542 || strcmp(var
->name
, "gl_Color") == 0
3543 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3544 && earlier
->type
== var
->type
3545 && earlier
->data
.mode
== var
->data
.mode
) {
3546 earlier
->data
.interpolation
= var
->data
.interpolation
;
3548 /* Layout qualifiers for gl_FragDepth. */
3549 } else if ((state
->AMD_conservative_depth_enable
||
3550 state
->ARB_conservative_depth_enable
)
3551 && strcmp(var
->name
, "gl_FragDepth") == 0
3552 && earlier
->type
== var
->type
3553 && earlier
->data
.mode
== var
->data
.mode
) {
3555 /** From the AMD_conservative_depth spec:
3556 * Within any shader, the first redeclarations of gl_FragDepth
3557 * must appear before any use of gl_FragDepth.
3559 if (earlier
->data
.used
) {
3560 _mesa_glsl_error(&loc
, state
,
3561 "the first redeclaration of gl_FragDepth "
3562 "must appear before any use of gl_FragDepth");
3565 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3566 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3567 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3568 _mesa_glsl_error(&loc
, state
,
3569 "gl_FragDepth: depth layout is declared here "
3570 "as '%s, but it was previously declared as "
3572 depth_layout_string(var
->data
.depth_layout
),
3573 depth_layout_string(earlier
->data
.depth_layout
));
3576 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3578 } else if (allow_all_redeclarations
) {
3579 if (earlier
->data
.mode
!= var
->data
.mode
) {
3580 _mesa_glsl_error(&loc
, state
,
3581 "redeclaration of `%s' with incorrect qualifiers",
3583 } else if (earlier
->type
!= var
->type
) {
3584 _mesa_glsl_error(&loc
, state
,
3585 "redeclaration of `%s' has incorrect type",
3589 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3596 * Generate the IR for an initializer in a variable declaration
3599 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3600 ast_fully_specified_type
*type
,
3601 exec_list
*initializer_instructions
,
3602 struct _mesa_glsl_parse_state
*state
)
3604 ir_rvalue
*result
= NULL
;
3606 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3608 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3610 * "All uniform variables are read-only and are initialized either
3611 * directly by an application via API commands, or indirectly by
3614 if (var
->data
.mode
== ir_var_uniform
) {
3615 state
->check_version(120, 0, &initializer_loc
,
3616 "cannot initialize uniform %s",
3620 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3622 * "Buffer variables cannot have initializers."
3624 if (var
->data
.mode
== ir_var_shader_storage
) {
3625 _mesa_glsl_error(&initializer_loc
, state
,
3626 "cannot initialize buffer variable %s",
3630 /* From section 4.1.7 of the GLSL 4.40 spec:
3632 * "Opaque variables [...] are initialized only through the
3633 * OpenGL API; they cannot be declared with an initializer in a
3636 if (var
->type
->contains_opaque()) {
3637 _mesa_glsl_error(&initializer_loc
, state
,
3638 "cannot initialize opaque variable %s",
3642 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3643 _mesa_glsl_error(&initializer_loc
, state
,
3644 "cannot initialize %s shader input / %s %s",
3645 _mesa_shader_stage_to_string(state
->stage
),
3646 (state
->stage
== MESA_SHADER_VERTEX
)
3647 ? "attribute" : "varying",
3651 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
3652 _mesa_glsl_error(&initializer_loc
, state
,
3653 "cannot initialize %s shader output %s",
3654 _mesa_shader_stage_to_string(state
->stage
),
3658 /* If the initializer is an ast_aggregate_initializer, recursively store
3659 * type information from the LHS into it, so that its hir() function can do
3662 if (decl
->initializer
->oper
== ast_aggregate
)
3663 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3665 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3666 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3668 /* Calculate the constant value if this is a const or uniform
3671 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
3673 * "Declarations of globals without a storage qualifier, or with
3674 * just the const qualifier, may include initializers, in which case
3675 * they will be initialized before the first line of main() is
3676 * executed. Such initializers must be a constant expression."
3678 * The same section of the GLSL ES 3.00.4 spec has similar language.
3680 if (type
->qualifier
.flags
.q
.constant
3681 || type
->qualifier
.flags
.q
.uniform
3682 || (state
->es_shader
&& state
->current_function
== NULL
)) {
3683 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3685 if (new_rhs
!= NULL
) {
3688 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
3691 * "A constant expression is one of
3695 * - an expression formed by an operator on operands that are
3696 * all constant expressions, including getting an element of
3697 * a constant array, or a field of a constant structure, or
3698 * components of a constant vector. However, the sequence
3699 * operator ( , ) and the assignment operators ( =, +=, ...)
3700 * are not included in the operators that can create a
3701 * constant expression."
3703 * Section 12.43 (Sequence operator and constant expressions) says:
3705 * "Should the following construct be allowed?
3709 * The expression within the brackets uses the sequence operator
3710 * (',') and returns the integer 3 so the construct is declaring
3711 * a single-dimensional array of size 3. In some languages, the
3712 * construct declares a two-dimensional array. It would be
3713 * preferable to make this construct illegal to avoid confusion.
3715 * One possibility is to change the definition of the sequence
3716 * operator so that it does not return a constant-expression and
3717 * hence cannot be used to declare an array size.
3719 * RESOLUTION: The result of a sequence operator is not a
3720 * constant-expression."
3722 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
3723 * contains language almost identical to the section 4.3.3 in the
3724 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
3727 ir_constant
*constant_value
= rhs
->constant_expression_value();
3728 if (!constant_value
||
3729 (state
->is_version(430, 300) &&
3730 decl
->initializer
->has_sequence_subexpression())) {
3731 const char *const variable_mode
=
3732 (type
->qualifier
.flags
.q
.constant
)
3734 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
3736 /* If ARB_shading_language_420pack is enabled, initializers of
3737 * const-qualified local variables do not have to be constant
3738 * expressions. Const-qualified global variables must still be
3739 * initialized with constant expressions.
3741 if (!state
->has_420pack()
3742 || state
->current_function
== NULL
) {
3743 _mesa_glsl_error(& initializer_loc
, state
,
3744 "initializer of %s variable `%s' must be a "
3745 "constant expression",
3748 if (var
->type
->is_numeric()) {
3749 /* Reduce cascading errors. */
3750 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3751 ? ir_constant::zero(state
, var
->type
) : NULL
;
3755 rhs
= constant_value
;
3756 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3757 ? constant_value
: NULL
;
3760 if (var
->type
->is_numeric()) {
3761 /* Reduce cascading errors. */
3762 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3763 ? ir_constant::zero(state
, var
->type
) : NULL
;
3768 if (rhs
&& !rhs
->type
->is_error()) {
3769 bool temp
= var
->data
.read_only
;
3770 if (type
->qualifier
.flags
.q
.constant
)
3771 var
->data
.read_only
= false;
3773 /* Never emit code to initialize a uniform.
3775 const glsl_type
*initializer_type
;
3776 if (!type
->qualifier
.flags
.q
.uniform
) {
3777 do_assignment(initializer_instructions
, state
,
3782 type
->get_location());
3783 initializer_type
= result
->type
;
3785 initializer_type
= rhs
->type
;
3787 var
->constant_initializer
= rhs
->constant_expression_value();
3788 var
->data
.has_initializer
= true;
3790 /* If the declared variable is an unsized array, it must inherrit
3791 * its full type from the initializer. A declaration such as
3793 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3797 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3799 * The assignment generated in the if-statement (below) will also
3800 * automatically handle this case for non-uniforms.
3802 * If the declared variable is not an array, the types must
3803 * already match exactly. As a result, the type assignment
3804 * here can be done unconditionally. For non-uniforms the call
3805 * to do_assignment can change the type of the initializer (via
3806 * the implicit conversion rules). For uniforms the initializer
3807 * must be a constant expression, and the type of that expression
3808 * was validated above.
3810 var
->type
= initializer_type
;
3812 var
->data
.read_only
= temp
;
3819 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3820 YYLTYPE loc
, ir_variable
*var
,
3821 unsigned num_vertices
,
3823 const char *var_category
)
3825 if (var
->type
->is_unsized_array()) {
3826 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3828 * All geometry shader input unsized array declarations will be
3829 * sized by an earlier input layout qualifier, when present, as per
3830 * the following table.
3832 * Followed by a table mapping each allowed input layout qualifier to
3833 * the corresponding input length.
3835 * Similarly for tessellation control shader outputs.
3837 if (num_vertices
!= 0)
3838 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3841 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3842 * includes the following examples of compile-time errors:
3844 * // code sequence within one shader...
3845 * in vec4 Color1[]; // size unknown
3846 * ...Color1.length()...// illegal, length() unknown
3847 * in vec4 Color2[2]; // size is 2
3848 * ...Color1.length()...// illegal, Color1 still has no size
3849 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3850 * layout(lines) in; // legal, input size is 2, matching
3851 * in vec4 Color4[3]; // illegal, contradicts layout
3854 * To detect the case illustrated by Color3, we verify that the size of
3855 * an explicitly-sized array matches the size of any previously declared
3856 * explicitly-sized array. To detect the case illustrated by Color4, we
3857 * verify that the size of an explicitly-sized array is consistent with
3858 * any previously declared input layout.
3860 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3861 _mesa_glsl_error(&loc
, state
,
3862 "%s size contradicts previously declared layout "
3863 "(size is %u, but layout requires a size of %u)",
3864 var_category
, var
->type
->length
, num_vertices
);
3865 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3866 _mesa_glsl_error(&loc
, state
,
3867 "%s sizes are inconsistent (size is %u, but a "
3868 "previous declaration has size %u)",
3869 var_category
, var
->type
->length
, *size
);
3871 *size
= var
->type
->length
;
3877 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3878 YYLTYPE loc
, ir_variable
*var
)
3880 unsigned num_vertices
= 0;
3882 if (state
->tcs_output_vertices_specified
) {
3883 if (!state
->out_qualifier
->vertices
->
3884 process_qualifier_constant(state
, "vertices",
3885 &num_vertices
, false)) {
3889 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
3890 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
3891 "GL_MAX_PATCH_VERTICES", num_vertices
);
3896 if (!var
->type
->is_array() && !var
->data
.patch
) {
3897 _mesa_glsl_error(&loc
, state
,
3898 "tessellation control shader outputs must be arrays");
3900 /* To avoid cascading failures, short circuit the checks below. */
3904 if (var
->data
.patch
)
3907 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3908 &state
->tcs_output_size
,
3909 "tessellation control shader output");
3913 * Do additional processing necessary for tessellation control/evaluation shader
3914 * input declarations. This covers both interface block arrays and bare input
3918 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3919 YYLTYPE loc
, ir_variable
*var
)
3921 if (!var
->type
->is_array() && !var
->data
.patch
) {
3922 _mesa_glsl_error(&loc
, state
,
3923 "per-vertex tessellation shader inputs must be arrays");
3924 /* Avoid cascading failures. */
3928 if (var
->data
.patch
)
3931 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
3932 if (var
->type
->is_unsized_array()) {
3933 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3934 state
->Const
.MaxPatchVertices
);
3940 * Do additional processing necessary for geometry shader input declarations
3941 * (this covers both interface blocks arrays and bare input variables).
3944 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3945 YYLTYPE loc
, ir_variable
*var
)
3947 unsigned num_vertices
= 0;
3949 if (state
->gs_input_prim_type_specified
) {
3950 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
3953 /* Geometry shader input variables must be arrays. Caller should have
3954 * reported an error for this.
3956 if (!var
->type
->is_array()) {
3957 assert(state
->error
);
3959 /* To avoid cascading failures, short circuit the checks below. */
3963 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3964 &state
->gs_input_size
,
3965 "geometry shader input");
3969 validate_identifier(const char *identifier
, YYLTYPE loc
,
3970 struct _mesa_glsl_parse_state
*state
)
3972 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3974 * "Identifiers starting with "gl_" are reserved for use by
3975 * OpenGL, and may not be declared in a shader as either a
3976 * variable or a function."
3978 if (is_gl_identifier(identifier
)) {
3979 _mesa_glsl_error(&loc
, state
,
3980 "identifier `%s' uses reserved `gl_' prefix",
3982 } else if (strstr(identifier
, "__")) {
3983 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3986 * "In addition, all identifiers containing two
3987 * consecutive underscores (__) are reserved as
3988 * possible future keywords."
3990 * The intention is that names containing __ are reserved for internal
3991 * use by the implementation, and names prefixed with GL_ are reserved
3992 * for use by Khronos. Names simply containing __ are dangerous to use,
3993 * but should be allowed.
3995 * A future version of the GLSL specification will clarify this.
3997 _mesa_glsl_warning(&loc
, state
,
3998 "identifier `%s' uses reserved `__' string",
4004 ast_declarator_list::hir(exec_list
*instructions
,
4005 struct _mesa_glsl_parse_state
*state
)
4008 const struct glsl_type
*decl_type
;
4009 const char *type_name
= NULL
;
4010 ir_rvalue
*result
= NULL
;
4011 YYLTYPE loc
= this->get_location();
4013 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4015 * "To ensure that a particular output variable is invariant, it is
4016 * necessary to use the invariant qualifier. It can either be used to
4017 * qualify a previously declared variable as being invariant
4019 * invariant gl_Position; // make existing gl_Position be invariant"
4021 * In these cases the parser will set the 'invariant' flag in the declarator
4022 * list, and the type will be NULL.
4024 if (this->invariant
) {
4025 assert(this->type
== NULL
);
4027 if (state
->current_function
!= NULL
) {
4028 _mesa_glsl_error(& loc
, state
,
4029 "all uses of `invariant' keyword must be at global "
4033 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4034 assert(decl
->array_specifier
== NULL
);
4035 assert(decl
->initializer
== NULL
);
4037 ir_variable
*const earlier
=
4038 state
->symbols
->get_variable(decl
->identifier
);
4039 if (earlier
== NULL
) {
4040 _mesa_glsl_error(& loc
, state
,
4041 "undeclared variable `%s' cannot be marked "
4042 "invariant", decl
->identifier
);
4043 } else if (!is_varying_var(earlier
, state
->stage
)) {
4044 _mesa_glsl_error(&loc
, state
,
4045 "`%s' cannot be marked invariant; interfaces between "
4046 "shader stages only.", decl
->identifier
);
4047 } else if (earlier
->data
.used
) {
4048 _mesa_glsl_error(& loc
, state
,
4049 "variable `%s' may not be redeclared "
4050 "`invariant' after being used",
4053 earlier
->data
.invariant
= true;
4057 /* Invariant redeclarations do not have r-values.
4062 if (this->precise
) {
4063 assert(this->type
== NULL
);
4065 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4066 assert(decl
->array_specifier
== NULL
);
4067 assert(decl
->initializer
== NULL
);
4069 ir_variable
*const earlier
=
4070 state
->symbols
->get_variable(decl
->identifier
);
4071 if (earlier
== NULL
) {
4072 _mesa_glsl_error(& loc
, state
,
4073 "undeclared variable `%s' cannot be marked "
4074 "precise", decl
->identifier
);
4075 } else if (state
->current_function
!= NULL
&&
4076 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4077 /* Note: we have to check if we're in a function, since
4078 * builtins are treated as having come from another scope.
4080 _mesa_glsl_error(& loc
, state
,
4081 "variable `%s' from an outer scope may not be "
4082 "redeclared `precise' in this scope",
4084 } else if (earlier
->data
.used
) {
4085 _mesa_glsl_error(& loc
, state
,
4086 "variable `%s' may not be redeclared "
4087 "`precise' after being used",
4090 earlier
->data
.precise
= true;
4094 /* Precise redeclarations do not have r-values either. */
4098 assert(this->type
!= NULL
);
4099 assert(!this->invariant
);
4100 assert(!this->precise
);
4102 /* The type specifier may contain a structure definition. Process that
4103 * before any of the variable declarations.
4105 (void) this->type
->specifier
->hir(instructions
, state
);
4107 decl_type
= this->type
->glsl_type(& type_name
, state
);
4109 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4110 * "Buffer variables may only be declared inside interface blocks
4111 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4112 * shader storage blocks. It is a compile-time error to declare buffer
4113 * variables at global scope (outside a block)."
4115 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4116 _mesa_glsl_error(&loc
, state
,
4117 "buffer variables cannot be declared outside "
4118 "interface blocks");
4121 /* An offset-qualified atomic counter declaration sets the default
4122 * offset for the next declaration within the same atomic counter
4125 if (decl_type
&& decl_type
->contains_atomic()) {
4126 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4127 type
->qualifier
.flags
.q
.explicit_offset
) {
4128 unsigned qual_binding
;
4129 unsigned qual_offset
;
4130 if (process_qualifier_constant(state
, &loc
, "binding",
4131 type
->qualifier
.binding
,
4133 && process_qualifier_constant(state
, &loc
, "offset",
4134 type
->qualifier
.offset
,
4136 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4141 if (this->declarations
.is_empty()) {
4142 /* If there is no structure involved in the program text, there are two
4143 * possible scenarios:
4145 * - The program text contained something like 'vec4;'. This is an
4146 * empty declaration. It is valid but weird. Emit a warning.
4148 * - The program text contained something like 'S;' and 'S' is not the
4149 * name of a known structure type. This is both invalid and weird.
4152 * - The program text contained something like 'mediump float;'
4153 * when the programmer probably meant 'precision mediump
4154 * float;' Emit a warning with a description of what they
4155 * probably meant to do.
4157 * Note that if decl_type is NULL and there is a structure involved,
4158 * there must have been some sort of error with the structure. In this
4159 * case we assume that an error was already generated on this line of
4160 * code for the structure. There is no need to generate an additional,
4163 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4166 if (decl_type
== NULL
) {
4167 _mesa_glsl_error(&loc
, state
,
4168 "invalid type `%s' in empty declaration",
4170 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4171 /* Empty atomic counter declarations are allowed and useful
4172 * to set the default offset qualifier.
4175 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4176 if (this->type
->specifier
->structure
!= NULL
) {
4177 _mesa_glsl_error(&loc
, state
,
4178 "precision qualifiers can't be applied "
4181 static const char *const precision_names
[] = {
4188 _mesa_glsl_warning(&loc
, state
,
4189 "empty declaration with precision qualifier, "
4190 "to set the default precision, use "
4191 "`precision %s %s;'",
4192 precision_names
[this->type
->qualifier
.precision
],
4195 } else if (this->type
->specifier
->structure
== NULL
) {
4196 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4200 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4201 const struct glsl_type
*var_type
;
4203 const char *identifier
= decl
->identifier
;
4204 /* FINISHME: Emit a warning if a variable declaration shadows a
4205 * FINISHME: declaration at a higher scope.
4208 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4209 if (type_name
!= NULL
) {
4210 _mesa_glsl_error(& loc
, state
,
4211 "invalid type `%s' in declaration of `%s'",
4212 type_name
, decl
->identifier
);
4214 _mesa_glsl_error(& loc
, state
,
4215 "invalid type in declaration of `%s'",
4221 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4225 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4227 _mesa_glsl_error(& loc
, state
,
4228 "invalid type in declaration of `%s'",
4230 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4235 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4238 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4240 /* The 'varying in' and 'varying out' qualifiers can only be used with
4241 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4244 if (this->type
->qualifier
.flags
.q
.varying
) {
4245 if (this->type
->qualifier
.flags
.q
.in
) {
4246 _mesa_glsl_error(& loc
, state
,
4247 "`varying in' qualifier in declaration of "
4248 "`%s' only valid for geometry shaders using "
4249 "ARB_geometry_shader4 or EXT_geometry_shader4",
4251 } else if (this->type
->qualifier
.flags
.q
.out
) {
4252 _mesa_glsl_error(& loc
, state
,
4253 "`varying out' qualifier in declaration of "
4254 "`%s' only valid for geometry shaders using "
4255 "ARB_geometry_shader4 or EXT_geometry_shader4",
4260 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4262 * "Global variables can only use the qualifiers const,
4263 * attribute, uniform, or varying. Only one may be
4266 * Local variables can only use the qualifier const."
4268 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4269 * any extension that adds the 'layout' keyword.
4271 if (!state
->is_version(130, 300)
4272 && !state
->has_explicit_attrib_location()
4273 && !state
->has_separate_shader_objects()
4274 && !state
->ARB_fragment_coord_conventions_enable
) {
4275 if (this->type
->qualifier
.flags
.q
.out
) {
4276 _mesa_glsl_error(& loc
, state
,
4277 "`out' qualifier in declaration of `%s' "
4278 "only valid for function parameters in %s",
4279 decl
->identifier
, state
->get_version_string());
4281 if (this->type
->qualifier
.flags
.q
.in
) {
4282 _mesa_glsl_error(& loc
, state
,
4283 "`in' qualifier in declaration of `%s' "
4284 "only valid for function parameters in %s",
4285 decl
->identifier
, state
->get_version_string());
4287 /* FINISHME: Test for other invalid qualifiers. */
4290 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4292 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4295 if (this->type
->qualifier
.flags
.q
.invariant
) {
4296 if (!is_varying_var(var
, state
->stage
)) {
4297 _mesa_glsl_error(&loc
, state
,
4298 "`%s' cannot be marked invariant; interfaces between "
4299 "shader stages only", var
->name
);
4303 if (state
->current_function
!= NULL
) {
4304 const char *mode
= NULL
;
4305 const char *extra
= "";
4307 /* There is no need to check for 'inout' here because the parser will
4308 * only allow that in function parameter lists.
4310 if (this->type
->qualifier
.flags
.q
.attribute
) {
4312 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4313 mode
= "subroutine uniform";
4314 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4316 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4318 } else if (this->type
->qualifier
.flags
.q
.in
) {
4320 extra
= " or in function parameter list";
4321 } else if (this->type
->qualifier
.flags
.q
.out
) {
4323 extra
= " or in function parameter list";
4327 _mesa_glsl_error(& loc
, state
,
4328 "%s variable `%s' must be declared at "
4330 mode
, var
->name
, extra
);
4332 } else if (var
->data
.mode
== ir_var_shader_in
) {
4333 var
->data
.read_only
= true;
4335 if (state
->stage
== MESA_SHADER_VERTEX
) {
4336 bool error_emitted
= false;
4338 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4340 * "Vertex shader inputs can only be float, floating-point
4341 * vectors, matrices, signed and unsigned integers and integer
4342 * vectors. Vertex shader inputs can also form arrays of these
4343 * types, but not structures."
4345 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4347 * "Vertex shader inputs can only be float, floating-point
4348 * vectors, matrices, signed and unsigned integers and integer
4349 * vectors. They cannot be arrays or structures."
4351 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4353 * "The attribute qualifier can be used only with float,
4354 * floating-point vectors, and matrices. Attribute variables
4355 * cannot be declared as arrays or structures."
4357 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4359 * "Vertex shader inputs can only be float, floating-point
4360 * vectors, matrices, signed and unsigned integers and integer
4361 * vectors. Vertex shader inputs cannot be arrays or
4364 const glsl_type
*check_type
= var
->type
->without_array();
4366 switch (check_type
->base_type
) {
4367 case GLSL_TYPE_FLOAT
:
4369 case GLSL_TYPE_UINT
:
4371 if (state
->is_version(120, 300))
4373 case GLSL_TYPE_DOUBLE
:
4374 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4378 _mesa_glsl_error(& loc
, state
,
4379 "vertex shader input / attribute cannot have "
4381 var
->type
->is_array() ? "array of " : "",
4383 error_emitted
= true;
4386 if (!error_emitted
&& var
->type
->is_array() &&
4387 !state
->check_version(150, 0, &loc
,
4388 "vertex shader input / attribute "
4389 "cannot have array type")) {
4390 error_emitted
= true;
4392 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4393 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4395 * Geometry shader input variables get the per-vertex values
4396 * written out by vertex shader output variables of the same
4397 * names. Since a geometry shader operates on a set of
4398 * vertices, each input varying variable (or input block, see
4399 * interface blocks below) needs to be declared as an array.
4401 if (!var
->type
->is_array()) {
4402 _mesa_glsl_error(&loc
, state
,
4403 "geometry shader inputs must be arrays");
4406 handle_geometry_shader_input_decl(state
, loc
, var
);
4407 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4408 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4410 * It is a compile-time error to declare a fragment shader
4411 * input with, or that contains, any of the following types:
4415 * * An array of arrays
4416 * * An array of structures
4417 * * A structure containing an array
4418 * * A structure containing a structure
4420 if (state
->es_shader
) {
4421 const glsl_type
*check_type
= var
->type
->without_array();
4422 if (check_type
->is_boolean() ||
4423 check_type
->contains_opaque()) {
4424 _mesa_glsl_error(&loc
, state
,
4425 "fragment shader input cannot have type %s",
4428 if (var
->type
->is_array() &&
4429 var
->type
->fields
.array
->is_array()) {
4430 _mesa_glsl_error(&loc
, state
,
4432 "cannot have an array of arrays",
4433 _mesa_shader_stage_to_string(state
->stage
));
4435 if (var
->type
->is_array() &&
4436 var
->type
->fields
.array
->is_record()) {
4437 _mesa_glsl_error(&loc
, state
,
4438 "fragment shader input "
4439 "cannot have an array of structs");
4441 if (var
->type
->is_record()) {
4442 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4443 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4444 var
->type
->fields
.structure
[i
].type
->is_record())
4445 _mesa_glsl_error(&loc
, state
,
4446 "fragement shader input cannot have "
4447 "a struct that contains an "
4452 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4453 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4454 handle_tess_shader_input_decl(state
, loc
, var
);
4456 } else if (var
->data
.mode
== ir_var_shader_out
) {
4457 const glsl_type
*check_type
= var
->type
->without_array();
4459 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4461 * It is a compile-time error to declare a vertex, tessellation
4462 * evaluation, tessellation control, or geometry shader output
4463 * that contains any of the following:
4465 * * A Boolean type (bool, bvec2 ...)
4468 if (check_type
->is_boolean() || check_type
->contains_opaque())
4469 _mesa_glsl_error(&loc
, state
,
4470 "%s shader output cannot have type %s",
4471 _mesa_shader_stage_to_string(state
->stage
),
4474 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4476 * It is a compile-time error to declare a fragment shader output
4477 * that contains any of the following:
4479 * * A Boolean type (bool, bvec2 ...)
4480 * * A double-precision scalar or vector (double, dvec2 ...)
4485 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4486 if (check_type
->is_record() || check_type
->is_matrix())
4487 _mesa_glsl_error(&loc
, state
,
4488 "fragment shader output "
4489 "cannot have struct or matrix type");
4490 switch (check_type
->base_type
) {
4491 case GLSL_TYPE_UINT
:
4493 case GLSL_TYPE_FLOAT
:
4496 _mesa_glsl_error(&loc
, state
,
4497 "fragment shader output cannot have "
4498 "type %s", check_type
->name
);
4502 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4504 * It is a compile-time error to declare a vertex shader output
4505 * with, or that contains, any of the following types:
4509 * * An array of arrays
4510 * * An array of structures
4511 * * A structure containing an array
4512 * * A structure containing a structure
4514 * It is a compile-time error to declare a fragment shader output
4515 * with, or that contains, any of the following types:
4521 * * An array of array
4523 if (state
->es_shader
) {
4524 if (var
->type
->is_array() &&
4525 var
->type
->fields
.array
->is_array()) {
4526 _mesa_glsl_error(&loc
, state
,
4528 "cannot have an array of arrays",
4529 _mesa_shader_stage_to_string(state
->stage
));
4531 if (state
->stage
== MESA_SHADER_VERTEX
) {
4532 if (var
->type
->is_array() &&
4533 var
->type
->fields
.array
->is_record()) {
4534 _mesa_glsl_error(&loc
, state
,
4535 "vertex shader output "
4536 "cannot have an array of structs");
4538 if (var
->type
->is_record()) {
4539 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4540 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4541 var
->type
->fields
.structure
[i
].type
->is_record())
4542 _mesa_glsl_error(&loc
, state
,
4543 "vertex shader output cannot have a "
4544 "struct that contains an "
4551 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4552 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4554 } else if (var
->type
->contains_subroutine()) {
4555 /* declare subroutine uniforms as hidden */
4556 var
->data
.how_declared
= ir_var_hidden
;
4559 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4560 * so must integer vertex outputs.
4562 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4563 * "Fragment shader inputs that are signed or unsigned integers or
4564 * integer vectors must be qualified with the interpolation qualifier
4567 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4568 * "Fragment shader inputs that are, or contain, signed or unsigned
4569 * integers or integer vectors must be qualified with the
4570 * interpolation qualifier flat."
4572 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4573 * "Vertex shader outputs that are, or contain, signed or unsigned
4574 * integers or integer vectors must be qualified with the
4575 * interpolation qualifier flat."
4577 * Note that prior to GLSL 1.50, this requirement applied to vertex
4578 * outputs rather than fragment inputs. That creates problems in the
4579 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4580 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4581 * apply the restriction to both vertex outputs and fragment inputs.
4583 * Note also that the desktop GLSL specs are missing the text "or
4584 * contain"; this is presumably an oversight, since there is no
4585 * reasonable way to interpolate a fragment shader input that contains
4588 if (state
->is_version(130, 300) &&
4589 var
->type
->contains_integer() &&
4590 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4591 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4592 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4593 && state
->es_shader
))) {
4594 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4595 "vertex output" : "fragment input";
4596 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4597 "an integer, then it must be qualified with 'flat'",
4601 /* Double fragment inputs must be qualified with 'flat'. */
4602 if (var
->type
->contains_double() &&
4603 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4604 state
->stage
== MESA_SHADER_FRAGMENT
&&
4605 var
->data
.mode
== ir_var_shader_in
) {
4606 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4607 "a double, then it must be qualified with 'flat'",
4611 /* Interpolation qualifiers cannot be applied to 'centroid' and
4612 * 'centroid varying'.
4614 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4615 * "interpolation qualifiers may only precede the qualifiers in,
4616 * centroid in, out, or centroid out in a declaration. They do not apply
4617 * to the deprecated storage qualifiers varying or centroid varying."
4619 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4621 if (state
->is_version(130, 0)
4622 && this->type
->qualifier
.has_interpolation()
4623 && this->type
->qualifier
.flags
.q
.varying
) {
4625 const char *i
= this->type
->qualifier
.interpolation_string();
4628 if (this->type
->qualifier
.flags
.q
.centroid
)
4629 s
= "centroid varying";
4633 _mesa_glsl_error(&loc
, state
,
4634 "qualifier '%s' cannot be applied to the "
4635 "deprecated storage qualifier '%s'", i
, s
);
4639 /* Interpolation qualifiers can only apply to vertex shader outputs and
4640 * fragment shader inputs.
4642 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4643 * "Outputs from a vertex shader (out) and inputs to a fragment
4644 * shader (in) can be further qualified with one or more of these
4645 * interpolation qualifiers"
4647 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4648 * "These interpolation qualifiers may only precede the qualifiers
4649 * in, centroid in, out, or centroid out in a declaration. They do
4650 * not apply to inputs into a vertex shader or outputs from a
4653 if (state
->is_version(130, 300)
4654 && this->type
->qualifier
.has_interpolation()) {
4656 const char *i
= this->type
->qualifier
.interpolation_string();
4659 switch (state
->stage
) {
4660 case MESA_SHADER_VERTEX
:
4661 if (this->type
->qualifier
.flags
.q
.in
) {
4662 _mesa_glsl_error(&loc
, state
,
4663 "qualifier '%s' cannot be applied to vertex "
4664 "shader inputs", i
);
4667 case MESA_SHADER_FRAGMENT
:
4668 if (this->type
->qualifier
.flags
.q
.out
) {
4669 _mesa_glsl_error(&loc
, state
,
4670 "qualifier '%s' cannot be applied to fragment "
4671 "shader outputs", i
);
4680 /* From section 4.3.4 of the GLSL 4.00 spec:
4681 * "Input variables may not be declared using the patch in qualifier
4682 * in tessellation control or geometry shaders."
4684 * From section 4.3.6 of the GLSL 4.00 spec:
4685 * "It is an error to use patch out in a vertex, tessellation
4686 * evaluation, or geometry shader."
4688 * This doesn't explicitly forbid using them in a fragment shader, but
4689 * that's probably just an oversight.
4691 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4692 && this->type
->qualifier
.flags
.q
.patch
4693 && this->type
->qualifier
.flags
.q
.in
) {
4695 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4696 "tessellation evaluation shader");
4699 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4700 && this->type
->qualifier
.flags
.q
.patch
4701 && this->type
->qualifier
.flags
.q
.out
) {
4703 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4704 "tessellation control shader");
4707 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4709 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4710 state
->check_precision_qualifiers_allowed(&loc
);
4714 /* If a precision qualifier is allowed on a type, it is allowed on
4715 * an array of that type.
4717 if (!(this->type
->qualifier
.precision
== ast_precision_none
4718 || precision_qualifier_allowed(var
->type
->without_array()))) {
4720 _mesa_glsl_error(&loc
, state
,
4721 "precision qualifiers apply only to floating point"
4722 ", integer and opaque types");
4725 /* From section 4.1.7 of the GLSL 4.40 spec:
4727 * "[Opaque types] can only be declared as function
4728 * parameters or uniform-qualified variables."
4730 if (var_type
->contains_opaque() &&
4731 !this->type
->qualifier
.flags
.q
.uniform
) {
4732 _mesa_glsl_error(&loc
, state
,
4733 "opaque variables must be declared uniform");
4736 /* Process the initializer and add its instructions to a temporary
4737 * list. This list will be added to the instruction stream (below) after
4738 * the declaration is added. This is done because in some cases (such as
4739 * redeclarations) the declaration may not actually be added to the
4740 * instruction stream.
4742 exec_list initializer_instructions
;
4744 /* Examine var name here since var may get deleted in the next call */
4745 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4747 ir_variable
*earlier
=
4748 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4749 false /* allow_all_redeclarations */);
4750 if (earlier
!= NULL
) {
4752 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4753 _mesa_glsl_error(&loc
, state
,
4754 "`%s' has already been redeclared using "
4755 "gl_PerVertex", earlier
->name
);
4757 earlier
->data
.how_declared
= ir_var_declared_normally
;
4760 if (decl
->initializer
!= NULL
) {
4761 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4763 &initializer_instructions
, state
);
4765 validate_array_dimensions(var_type
, state
, &loc
);
4768 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4770 * "It is an error to write to a const variable outside of
4771 * its declaration, so they must be initialized when
4774 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4775 _mesa_glsl_error(& loc
, state
,
4776 "const declaration of `%s' must be initialized",
4780 if (state
->es_shader
) {
4781 const glsl_type
*const t
= (earlier
== NULL
)
4782 ? var
->type
: earlier
->type
;
4784 if (t
->is_unsized_array())
4785 /* Section 10.17 of the GLSL ES 1.00 specification states that
4786 * unsized array declarations have been removed from the language.
4787 * Arrays that are sized using an initializer are still explicitly
4788 * sized. However, GLSL ES 1.00 does not allow array
4789 * initializers. That is only allowed in GLSL ES 3.00.
4791 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4793 * "An array type can also be formed without specifying a size
4794 * if the definition includes an initializer:
4796 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4797 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4802 _mesa_glsl_error(& loc
, state
,
4803 "unsized array declarations are not allowed in "
4807 /* If the declaration is not a redeclaration, there are a few additional
4808 * semantic checks that must be applied. In addition, variable that was
4809 * created for the declaration should be added to the IR stream.
4811 if (earlier
== NULL
) {
4812 validate_identifier(decl
->identifier
, loc
, state
);
4814 /* Add the variable to the symbol table. Note that the initializer's
4815 * IR was already processed earlier (though it hasn't been emitted
4816 * yet), without the variable in scope.
4818 * This differs from most C-like languages, but it follows the GLSL
4819 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4822 * "Within a declaration, the scope of a name starts immediately
4823 * after the initializer if present or immediately after the name
4824 * being declared if not."
4826 if (!state
->symbols
->add_variable(var
)) {
4827 YYLTYPE loc
= this->get_location();
4828 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4829 "current scope", decl
->identifier
);
4833 /* Push the variable declaration to the top. It means that all the
4834 * variable declarations will appear in a funny last-to-first order,
4835 * but otherwise we run into trouble if a function is prototyped, a
4836 * global var is decled, then the function is defined with usage of
4837 * the global var. See glslparsertest's CorrectModule.frag.
4839 instructions
->push_head(var
);
4842 instructions
->append_list(&initializer_instructions
);
4846 /* Generally, variable declarations do not have r-values. However,
4847 * one is used for the declaration in
4849 * while (bool b = some_condition()) {
4853 * so we return the rvalue from the last seen declaration here.
4860 ast_parameter_declarator::hir(exec_list
*instructions
,
4861 struct _mesa_glsl_parse_state
*state
)
4864 const struct glsl_type
*type
;
4865 const char *name
= NULL
;
4866 YYLTYPE loc
= this->get_location();
4868 type
= this->type
->glsl_type(& name
, state
);
4872 _mesa_glsl_error(& loc
, state
,
4873 "invalid type `%s' in declaration of `%s'",
4874 name
, this->identifier
);
4876 _mesa_glsl_error(& loc
, state
,
4877 "invalid type in declaration of `%s'",
4881 type
= glsl_type::error_type
;
4884 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4886 * "Functions that accept no input arguments need not use void in the
4887 * argument list because prototypes (or definitions) are required and
4888 * therefore there is no ambiguity when an empty argument list "( )" is
4889 * declared. The idiom "(void)" as a parameter list is provided for
4892 * Placing this check here prevents a void parameter being set up
4893 * for a function, which avoids tripping up checks for main taking
4894 * parameters and lookups of an unnamed symbol.
4896 if (type
->is_void()) {
4897 if (this->identifier
!= NULL
)
4898 _mesa_glsl_error(& loc
, state
,
4899 "named parameter cannot have type `void'");
4905 if (formal_parameter
&& (this->identifier
== NULL
)) {
4906 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4910 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4911 * call already handled the "vec4[..] foo" case.
4913 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4915 if (!type
->is_error() && type
->is_unsized_array()) {
4916 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4918 type
= glsl_type::error_type
;
4922 ir_variable
*var
= new(ctx
)
4923 ir_variable(type
, this->identifier
, ir_var_function_in
);
4925 /* Apply any specified qualifiers to the parameter declaration. Note that
4926 * for function parameters the default mode is 'in'.
4928 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
4931 /* From section 4.1.7 of the GLSL 4.40 spec:
4933 * "Opaque variables cannot be treated as l-values; hence cannot
4934 * be used as out or inout function parameters, nor can they be
4937 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4938 && type
->contains_opaque()) {
4939 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
4940 "contain opaque variables");
4941 type
= glsl_type::error_type
;
4944 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
4946 * "When calling a function, expressions that do not evaluate to
4947 * l-values cannot be passed to parameters declared as out or inout."
4949 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
4951 * "Other binary or unary expressions, non-dereferenced arrays,
4952 * function names, swizzles with repeated fields, and constants
4953 * cannot be l-values."
4955 * So for GLSL 1.10, passing an array as an out or inout parameter is not
4956 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
4958 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4960 && !state
->check_version(120, 100, &loc
,
4961 "arrays cannot be out or inout parameters")) {
4962 type
= glsl_type::error_type
;
4965 instructions
->push_tail(var
);
4967 /* Parameter declarations do not have r-values.
4974 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
4976 exec_list
*ir_parameters
,
4977 _mesa_glsl_parse_state
*state
)
4979 ast_parameter_declarator
*void_param
= NULL
;
4982 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
4983 param
->formal_parameter
= formal
;
4984 param
->hir(ir_parameters
, state
);
4992 if ((void_param
!= NULL
) && (count
> 1)) {
4993 YYLTYPE loc
= void_param
->get_location();
4995 _mesa_glsl_error(& loc
, state
,
4996 "`void' parameter must be only parameter");
5002 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5004 /* IR invariants disallow function declarations or definitions
5005 * nested within other function definitions. But there is no
5006 * requirement about the relative order of function declarations
5007 * and definitions with respect to one another. So simply insert
5008 * the new ir_function block at the end of the toplevel instruction
5011 state
->toplevel_ir
->push_tail(f
);
5016 ast_function::hir(exec_list
*instructions
,
5017 struct _mesa_glsl_parse_state
*state
)
5020 ir_function
*f
= NULL
;
5021 ir_function_signature
*sig
= NULL
;
5022 exec_list hir_parameters
;
5023 YYLTYPE loc
= this->get_location();
5025 const char *const name
= identifier
;
5027 /* New functions are always added to the top-level IR instruction stream,
5028 * so this instruction list pointer is ignored. See also emit_function
5031 (void) instructions
;
5033 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5035 * "Function declarations (prototypes) cannot occur inside of functions;
5036 * they must be at global scope, or for the built-in functions, outside
5037 * the global scope."
5039 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5041 * "User defined functions may only be defined within the global scope."
5043 * Note that this language does not appear in GLSL 1.10.
5045 if ((state
->current_function
!= NULL
) &&
5046 state
->is_version(120, 100)) {
5047 YYLTYPE loc
= this->get_location();
5048 _mesa_glsl_error(&loc
, state
,
5049 "declaration of function `%s' not allowed within "
5050 "function body", name
);
5053 validate_identifier(name
, this->get_location(), state
);
5055 /* Convert the list of function parameters to HIR now so that they can be
5056 * used below to compare this function's signature with previously seen
5057 * signatures for functions with the same name.
5059 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5061 & hir_parameters
, state
);
5063 const char *return_type_name
;
5064 const glsl_type
*return_type
=
5065 this->return_type
->glsl_type(& return_type_name
, state
);
5068 YYLTYPE loc
= this->get_location();
5069 _mesa_glsl_error(&loc
, state
,
5070 "function `%s' has undeclared return type `%s'",
5071 name
, return_type_name
);
5072 return_type
= glsl_type::error_type
;
5075 /* ARB_shader_subroutine states:
5076 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5077 * subroutine(...) to a function declaration."
5079 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5080 YYLTYPE loc
= this->get_location();
5081 _mesa_glsl_error(&loc
, state
,
5082 "function declaration `%s' cannot have subroutine prepended",
5086 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5087 * "No qualifier is allowed on the return type of a function."
5089 if (this->return_type
->has_qualifiers(state
)) {
5090 YYLTYPE loc
= this->get_location();
5091 _mesa_glsl_error(& loc
, state
,
5092 "function `%s' return type has qualifiers", name
);
5095 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5097 * "Arrays are allowed as arguments and as the return type. In both
5098 * cases, the array must be explicitly sized."
5100 if (return_type
->is_unsized_array()) {
5101 YYLTYPE loc
= this->get_location();
5102 _mesa_glsl_error(& loc
, state
,
5103 "function `%s' return type array must be explicitly "
5107 /* From section 4.1.7 of the GLSL 4.40 spec:
5109 * "[Opaque types] can only be declared as function parameters
5110 * or uniform-qualified variables."
5112 if (return_type
->contains_opaque()) {
5113 YYLTYPE loc
= this->get_location();
5114 _mesa_glsl_error(&loc
, state
,
5115 "function `%s' return type can't contain an opaque type",
5119 /* Create an ir_function if one doesn't already exist. */
5120 f
= state
->symbols
->get_function(name
);
5122 f
= new(ctx
) ir_function(name
);
5123 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5124 if (!state
->symbols
->add_function(f
)) {
5125 /* This function name shadows a non-function use of the same name. */
5126 YYLTYPE loc
= this->get_location();
5127 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5128 "non-function", name
);
5132 emit_function(state
, f
);
5135 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5137 * "A shader cannot redefine or overload built-in functions."
5139 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5141 * "User code can overload the built-in functions but cannot redefine
5144 if (state
->es_shader
&& state
->language_version
>= 300) {
5145 /* Local shader has no exact candidates; check the built-ins. */
5146 _mesa_glsl_initialize_builtin_functions();
5147 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5148 YYLTYPE loc
= this->get_location();
5149 _mesa_glsl_error(& loc
, state
,
5150 "A shader cannot redefine or overload built-in "
5151 "function `%s' in GLSL ES 3.00", name
);
5156 /* Verify that this function's signature either doesn't match a previously
5157 * seen signature for a function with the same name, or, if a match is found,
5158 * that the previously seen signature does not have an associated definition.
5160 if (state
->es_shader
|| f
->has_user_signature()) {
5161 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5163 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5164 if (badvar
!= NULL
) {
5165 YYLTYPE loc
= this->get_location();
5167 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5168 "qualifiers don't match prototype", name
, badvar
);
5171 if (sig
->return_type
!= return_type
) {
5172 YYLTYPE loc
= this->get_location();
5174 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5175 "match prototype", name
);
5178 if (sig
->is_defined
) {
5179 if (is_definition
) {
5180 YYLTYPE loc
= this->get_location();
5181 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5183 /* We just encountered a prototype that exactly matches a
5184 * function that's already been defined. This is redundant,
5185 * and we should ignore it.
5193 /* Verify the return type of main() */
5194 if (strcmp(name
, "main") == 0) {
5195 if (! return_type
->is_void()) {
5196 YYLTYPE loc
= this->get_location();
5198 _mesa_glsl_error(& loc
, state
, "main() must return void");
5201 if (!hir_parameters
.is_empty()) {
5202 YYLTYPE loc
= this->get_location();
5204 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5208 /* Finish storing the information about this new function in its signature.
5211 sig
= new(ctx
) ir_function_signature(return_type
);
5212 f
->add_signature(sig
);
5215 sig
->replace_parameters(&hir_parameters
);
5218 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5221 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5222 unsigned qual_index
;
5223 if (process_qualifier_constant(state
, &loc
, "index",
5224 this->return_type
->qualifier
.index
,
5226 if (!state
->has_explicit_uniform_location()) {
5227 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5228 "GL_ARB_explicit_uniform_location or "
5230 } else if (qual_index
>= MAX_SUBROUTINES
) {
5231 _mesa_glsl_error(&loc
, state
,
5232 "invalid subroutine index (%d) index must "
5233 "be a number between 0 and "
5234 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5235 MAX_SUBROUTINES
- 1);
5237 f
->subroutine_index
= qual_index
;
5242 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5243 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5244 f
->num_subroutine_types
);
5246 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5247 const struct glsl_type
*type
;
5248 /* the subroutine type must be already declared */
5249 type
= state
->symbols
->get_type(decl
->identifier
);
5251 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5253 f
->subroutine_types
[idx
++] = type
;
5255 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5257 state
->num_subroutines
+ 1);
5258 state
->subroutines
[state
->num_subroutines
] = f
;
5259 state
->num_subroutines
++;
5263 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5264 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5265 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5268 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5270 state
->num_subroutine_types
+ 1);
5271 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5272 state
->num_subroutine_types
++;
5274 f
->is_subroutine
= true;
5277 /* Function declarations (prototypes) do not have r-values.
5284 ast_function_definition::hir(exec_list
*instructions
,
5285 struct _mesa_glsl_parse_state
*state
)
5287 prototype
->is_definition
= true;
5288 prototype
->hir(instructions
, state
);
5290 ir_function_signature
*signature
= prototype
->signature
;
5291 if (signature
== NULL
)
5294 assert(state
->current_function
== NULL
);
5295 state
->current_function
= signature
;
5296 state
->found_return
= false;
5298 /* Duplicate parameters declared in the prototype as concrete variables.
5299 * Add these to the symbol table.
5301 state
->symbols
->push_scope();
5302 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5303 assert(var
->as_variable() != NULL
);
5305 /* The only way a parameter would "exist" is if two parameters have
5308 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5309 YYLTYPE loc
= this->get_location();
5311 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5313 state
->symbols
->add_variable(var
);
5317 /* Convert the body of the function to HIR. */
5318 this->body
->hir(&signature
->body
, state
);
5319 signature
->is_defined
= true;
5321 state
->symbols
->pop_scope();
5323 assert(state
->current_function
== signature
);
5324 state
->current_function
= NULL
;
5326 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5327 YYLTYPE loc
= this->get_location();
5328 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5329 "%s, but no return statement",
5330 signature
->function_name(),
5331 signature
->return_type
->name
);
5334 /* Function definitions do not have r-values.
5341 ast_jump_statement::hir(exec_list
*instructions
,
5342 struct _mesa_glsl_parse_state
*state
)
5349 assert(state
->current_function
);
5351 if (opt_return_value
) {
5352 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5354 /* The value of the return type can be NULL if the shader says
5355 * 'return foo();' and foo() is a function that returns void.
5357 * NOTE: The GLSL spec doesn't say that this is an error. The type
5358 * of the return value is void. If the return type of the function is
5359 * also void, then this should compile without error. Seriously.
5361 const glsl_type
*const ret_type
=
5362 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5364 /* Implicit conversions are not allowed for return values prior to
5365 * ARB_shading_language_420pack.
5367 if (state
->current_function
->return_type
!= ret_type
) {
5368 YYLTYPE loc
= this->get_location();
5370 if (state
->has_420pack()) {
5371 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5373 _mesa_glsl_error(& loc
, state
,
5374 "could not implicitly convert return value "
5375 "to %s, in function `%s'",
5376 state
->current_function
->return_type
->name
,
5377 state
->current_function
->function_name());
5380 _mesa_glsl_error(& loc
, state
,
5381 "`return' with wrong type %s, in function `%s' "
5384 state
->current_function
->function_name(),
5385 state
->current_function
->return_type
->name
);
5387 } else if (state
->current_function
->return_type
->base_type
==
5389 YYLTYPE loc
= this->get_location();
5391 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5392 * specs add a clarification:
5394 * "A void function can only use return without a return argument, even if
5395 * the return argument has void type. Return statements only accept values:
5398 * void func2() { return func1(); } // illegal return statement"
5400 _mesa_glsl_error(& loc
, state
,
5401 "void functions can only use `return' without a "
5405 inst
= new(ctx
) ir_return(ret
);
5407 if (state
->current_function
->return_type
->base_type
!=
5409 YYLTYPE loc
= this->get_location();
5411 _mesa_glsl_error(& loc
, state
,
5412 "`return' with no value, in function %s returning "
5414 state
->current_function
->function_name());
5416 inst
= new(ctx
) ir_return
;
5419 state
->found_return
= true;
5420 instructions
->push_tail(inst
);
5425 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5426 YYLTYPE loc
= this->get_location();
5428 _mesa_glsl_error(& loc
, state
,
5429 "`discard' may only appear in a fragment shader");
5431 instructions
->push_tail(new(ctx
) ir_discard
);
5436 if (mode
== ast_continue
&&
5437 state
->loop_nesting_ast
== NULL
) {
5438 YYLTYPE loc
= this->get_location();
5440 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5441 } else if (mode
== ast_break
&&
5442 state
->loop_nesting_ast
== NULL
&&
5443 state
->switch_state
.switch_nesting_ast
== NULL
) {
5444 YYLTYPE loc
= this->get_location();
5446 _mesa_glsl_error(& loc
, state
,
5447 "break may only appear in a loop or a switch");
5449 /* For a loop, inline the for loop expression again, since we don't
5450 * know where near the end of the loop body the normal copy of it is
5451 * going to be placed. Same goes for the condition for a do-while
5454 if (state
->loop_nesting_ast
!= NULL
&&
5455 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5456 if (state
->loop_nesting_ast
->rest_expression
) {
5457 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5460 if (state
->loop_nesting_ast
->mode
==
5461 ast_iteration_statement::ast_do_while
) {
5462 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5466 if (state
->switch_state
.is_switch_innermost
&&
5467 mode
== ast_continue
) {
5468 /* Set 'continue_inside' to true. */
5469 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5470 ir_dereference_variable
*deref_continue_inside_var
=
5471 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5472 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5475 /* Break out from the switch, continue for the loop will
5476 * be called right after switch. */
5477 ir_loop_jump
*const jump
=
5478 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5479 instructions
->push_tail(jump
);
5481 } else if (state
->switch_state
.is_switch_innermost
&&
5482 mode
== ast_break
) {
5483 /* Force break out of switch by inserting a break. */
5484 ir_loop_jump
*const jump
=
5485 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5486 instructions
->push_tail(jump
);
5488 ir_loop_jump
*const jump
=
5489 new(ctx
) ir_loop_jump((mode
== ast_break
)
5490 ? ir_loop_jump::jump_break
5491 : ir_loop_jump::jump_continue
);
5492 instructions
->push_tail(jump
);
5499 /* Jump instructions do not have r-values.
5506 ast_selection_statement::hir(exec_list
*instructions
,
5507 struct _mesa_glsl_parse_state
*state
)
5511 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5513 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5515 * "Any expression whose type evaluates to a Boolean can be used as the
5516 * conditional expression bool-expression. Vector types are not accepted
5517 * as the expression to if."
5519 * The checks are separated so that higher quality diagnostics can be
5520 * generated for cases where both rules are violated.
5522 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5523 YYLTYPE loc
= this->condition
->get_location();
5525 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5529 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5531 if (then_statement
!= NULL
) {
5532 state
->symbols
->push_scope();
5533 then_statement
->hir(& stmt
->then_instructions
, state
);
5534 state
->symbols
->pop_scope();
5537 if (else_statement
!= NULL
) {
5538 state
->symbols
->push_scope();
5539 else_statement
->hir(& stmt
->else_instructions
, state
);
5540 state
->symbols
->pop_scope();
5543 instructions
->push_tail(stmt
);
5545 /* if-statements do not have r-values.
5552 ast_switch_statement::hir(exec_list
*instructions
,
5553 struct _mesa_glsl_parse_state
*state
)
5557 ir_rvalue
*const test_expression
=
5558 this->test_expression
->hir(instructions
, state
);
5560 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5562 * "The type of init-expression in a switch statement must be a
5565 if (!test_expression
->type
->is_scalar() ||
5566 !test_expression
->type
->is_integer()) {
5567 YYLTYPE loc
= this->test_expression
->get_location();
5569 _mesa_glsl_error(& loc
,
5571 "switch-statement expression must be scalar "
5575 /* Track the switch-statement nesting in a stack-like manner.
5577 struct glsl_switch_state saved
= state
->switch_state
;
5579 state
->switch_state
.is_switch_innermost
= true;
5580 state
->switch_state
.switch_nesting_ast
= this;
5581 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5582 hash_table_pointer_compare
);
5583 state
->switch_state
.previous_default
= NULL
;
5585 /* Initalize is_fallthru state to false.
5587 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5588 state
->switch_state
.is_fallthru_var
=
5589 new(ctx
) ir_variable(glsl_type::bool_type
,
5590 "switch_is_fallthru_tmp",
5592 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5594 ir_dereference_variable
*deref_is_fallthru_var
=
5595 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5596 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5599 /* Initialize continue_inside state to false.
5601 state
->switch_state
.continue_inside
=
5602 new(ctx
) ir_variable(glsl_type::bool_type
,
5603 "continue_inside_tmp",
5605 instructions
->push_tail(state
->switch_state
.continue_inside
);
5607 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5608 ir_dereference_variable
*deref_continue_inside_var
=
5609 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5610 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5613 state
->switch_state
.run_default
=
5614 new(ctx
) ir_variable(glsl_type::bool_type
,
5617 instructions
->push_tail(state
->switch_state
.run_default
);
5619 /* Loop around the switch is used for flow control. */
5620 ir_loop
* loop
= new(ctx
) ir_loop();
5621 instructions
->push_tail(loop
);
5623 /* Cache test expression.
5625 test_to_hir(&loop
->body_instructions
, state
);
5627 /* Emit code for body of switch stmt.
5629 body
->hir(&loop
->body_instructions
, state
);
5631 /* Insert a break at the end to exit loop. */
5632 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5633 loop
->body_instructions
.push_tail(jump
);
5635 /* If we are inside loop, check if continue got called inside switch. */
5636 if (state
->loop_nesting_ast
!= NULL
) {
5637 ir_dereference_variable
*deref_continue_inside
=
5638 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5639 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5640 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5642 if (state
->loop_nesting_ast
!= NULL
) {
5643 if (state
->loop_nesting_ast
->rest_expression
) {
5644 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5647 if (state
->loop_nesting_ast
->mode
==
5648 ast_iteration_statement::ast_do_while
) {
5649 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5652 irif
->then_instructions
.push_tail(jump
);
5653 instructions
->push_tail(irif
);
5656 hash_table_dtor(state
->switch_state
.labels_ht
);
5658 state
->switch_state
= saved
;
5660 /* Switch statements do not have r-values. */
5666 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5667 struct _mesa_glsl_parse_state
*state
)
5671 /* Cache value of test expression. */
5672 ir_rvalue
*const test_val
=
5673 test_expression
->hir(instructions
,
5676 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5679 ir_dereference_variable
*deref_test_var
=
5680 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5682 instructions
->push_tail(state
->switch_state
.test_var
);
5683 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5688 ast_switch_body::hir(exec_list
*instructions
,
5689 struct _mesa_glsl_parse_state
*state
)
5692 stmts
->hir(instructions
, state
);
5694 /* Switch bodies do not have r-values. */
5699 ast_case_statement_list::hir(exec_list
*instructions
,
5700 struct _mesa_glsl_parse_state
*state
)
5702 exec_list default_case
, after_default
, tmp
;
5704 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5705 case_stmt
->hir(&tmp
, state
);
5708 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5709 default_case
.append_list(&tmp
);
5713 /* If default case found, append 'after_default' list. */
5714 if (!default_case
.is_empty())
5715 after_default
.append_list(&tmp
);
5717 instructions
->append_list(&tmp
);
5720 /* Handle the default case. This is done here because default might not be
5721 * the last case. We need to add checks against following cases first to see
5722 * if default should be chosen or not.
5724 if (!default_case
.is_empty()) {
5726 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5727 ir_dereference_variable
*deref_run_default_var
=
5728 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5730 /* Choose to run default case initially, following conditional
5731 * assignments might change this.
5733 ir_assignment
*const init_var
=
5734 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5735 instructions
->push_tail(init_var
);
5737 /* Default case was the last one, no checks required. */
5738 if (after_default
.is_empty()) {
5739 instructions
->append_list(&default_case
);
5743 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5744 ir_assignment
*assign
= ir
->as_assignment();
5749 /* Clone the check between case label and init expression. */
5750 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5751 ir_expression
*clone
= exp
->clone(state
, NULL
);
5753 ir_dereference_variable
*deref_var
=
5754 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5755 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5757 ir_assignment
*const set_false
=
5758 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5760 instructions
->push_tail(set_false
);
5763 /* Append default case and all cases after it. */
5764 instructions
->append_list(&default_case
);
5765 instructions
->append_list(&after_default
);
5768 /* Case statements do not have r-values. */
5773 ast_case_statement::hir(exec_list
*instructions
,
5774 struct _mesa_glsl_parse_state
*state
)
5776 labels
->hir(instructions
, state
);
5778 /* Guard case statements depending on fallthru state. */
5779 ir_dereference_variable
*const deref_fallthru_guard
=
5780 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5781 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5783 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5784 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5786 instructions
->push_tail(test_fallthru
);
5788 /* Case statements do not have r-values. */
5794 ast_case_label_list::hir(exec_list
*instructions
,
5795 struct _mesa_glsl_parse_state
*state
)
5797 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5798 label
->hir(instructions
, state
);
5800 /* Case labels do not have r-values. */
5805 ast_case_label::hir(exec_list
*instructions
,
5806 struct _mesa_glsl_parse_state
*state
)
5810 ir_dereference_variable
*deref_fallthru_var
=
5811 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5813 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5815 /* If not default case, ... */
5816 if (this->test_value
!= NULL
) {
5817 /* Conditionally set fallthru state based on
5818 * comparison of cached test expression value to case label.
5820 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5821 ir_constant
*label_const
= label_rval
->constant_expression_value();
5824 YYLTYPE loc
= this->test_value
->get_location();
5826 _mesa_glsl_error(& loc
, state
,
5827 "switch statement case label must be a "
5828 "constant expression");
5830 /* Stuff a dummy value in to allow processing to continue. */
5831 label_const
= new(ctx
) ir_constant(0);
5833 ast_expression
*previous_label
= (ast_expression
*)
5834 hash_table_find(state
->switch_state
.labels_ht
,
5835 (void *)(uintptr_t)label_const
->value
.u
[0]);
5837 if (previous_label
) {
5838 YYLTYPE loc
= this->test_value
->get_location();
5839 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5841 loc
= previous_label
->get_location();
5842 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5844 hash_table_insert(state
->switch_state
.labels_ht
,
5846 (void *)(uintptr_t)label_const
->value
.u
[0]);
5850 ir_dereference_variable
*deref_test_var
=
5851 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5853 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5858 * From GLSL 4.40 specification section 6.2 ("Selection"):
5860 * "The type of the init-expression value in a switch statement must
5861 * be a scalar int or uint. The type of the constant-expression value
5862 * in a case label also must be a scalar int or uint. When any pair
5863 * of these values is tested for "equal value" and the types do not
5864 * match, an implicit conversion will be done to convert the int to a
5865 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5868 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5869 YYLTYPE loc
= this->test_value
->get_location();
5871 const glsl_type
*type_a
= label_const
->type
;
5872 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5874 /* Check if int->uint implicit conversion is supported. */
5875 bool integer_conversion_supported
=
5876 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5879 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5880 !integer_conversion_supported
) {
5881 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
5882 "init-expression and case label (%s != %s)",
5883 type_a
->name
, type_b
->name
);
5885 /* Conversion of the case label. */
5886 if (type_a
->base_type
== GLSL_TYPE_INT
) {
5887 if (!apply_implicit_conversion(glsl_type::uint_type
,
5888 test_cond
->operands
[0], state
))
5889 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5891 /* Conversion of the init-expression value. */
5892 if (!apply_implicit_conversion(glsl_type::uint_type
,
5893 test_cond
->operands
[1], state
))
5894 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5899 ir_assignment
*set_fallthru_on_test
=
5900 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5902 instructions
->push_tail(set_fallthru_on_test
);
5903 } else { /* default case */
5904 if (state
->switch_state
.previous_default
) {
5905 YYLTYPE loc
= this->get_location();
5906 _mesa_glsl_error(& loc
, state
,
5907 "multiple default labels in one switch");
5909 loc
= state
->switch_state
.previous_default
->get_location();
5910 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5912 state
->switch_state
.previous_default
= this;
5914 /* Set fallthru condition on 'run_default' bool. */
5915 ir_dereference_variable
*deref_run_default
=
5916 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5917 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5918 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5922 /* Set falltrhu state. */
5923 ir_assignment
*set_fallthru
=
5924 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5926 instructions
->push_tail(set_fallthru
);
5929 /* Case statements do not have r-values. */
5934 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
5935 struct _mesa_glsl_parse_state
*state
)
5939 if (condition
!= NULL
) {
5940 ir_rvalue
*const cond
=
5941 condition
->hir(instructions
, state
);
5944 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
5945 YYLTYPE loc
= condition
->get_location();
5947 _mesa_glsl_error(& loc
, state
,
5948 "loop condition must be scalar boolean");
5950 /* As the first code in the loop body, generate a block that looks
5951 * like 'if (!condition) break;' as the loop termination condition.
5953 ir_rvalue
*const not_cond
=
5954 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
5956 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
5958 ir_jump
*const break_stmt
=
5959 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5961 if_stmt
->then_instructions
.push_tail(break_stmt
);
5962 instructions
->push_tail(if_stmt
);
5969 ast_iteration_statement::hir(exec_list
*instructions
,
5970 struct _mesa_glsl_parse_state
*state
)
5974 /* For-loops and while-loops start a new scope, but do-while loops do not.
5976 if (mode
!= ast_do_while
)
5977 state
->symbols
->push_scope();
5979 if (init_statement
!= NULL
)
5980 init_statement
->hir(instructions
, state
);
5982 ir_loop
*const stmt
= new(ctx
) ir_loop();
5983 instructions
->push_tail(stmt
);
5985 /* Track the current loop nesting. */
5986 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
5988 state
->loop_nesting_ast
= this;
5990 /* Likewise, indicate that following code is closest to a loop,
5991 * NOT closest to a switch.
5993 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
5994 state
->switch_state
.is_switch_innermost
= false;
5996 if (mode
!= ast_do_while
)
5997 condition_to_hir(&stmt
->body_instructions
, state
);
6000 body
->hir(& stmt
->body_instructions
, state
);
6002 if (rest_expression
!= NULL
)
6003 rest_expression
->hir(& stmt
->body_instructions
, state
);
6005 if (mode
== ast_do_while
)
6006 condition_to_hir(&stmt
->body_instructions
, state
);
6008 if (mode
!= ast_do_while
)
6009 state
->symbols
->pop_scope();
6011 /* Restore previous nesting before returning. */
6012 state
->loop_nesting_ast
= nesting_ast
;
6013 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6015 /* Loops do not have r-values.
6022 * Determine if the given type is valid for establishing a default precision
6025 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6027 * "The precision statement
6029 * precision precision-qualifier type;
6031 * can be used to establish a default precision qualifier. The type field
6032 * can be either int or float or any of the sampler types, and the
6033 * precision-qualifier can be lowp, mediump, or highp."
6035 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6036 * qualifiers on sampler types, but this seems like an oversight (since the
6037 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6038 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6042 is_valid_default_precision_type(const struct glsl_type
*const type
)
6047 switch (type
->base_type
) {
6049 case GLSL_TYPE_FLOAT
:
6050 /* "int" and "float" are valid, but vectors and matrices are not. */
6051 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6052 case GLSL_TYPE_SAMPLER
:
6053 case GLSL_TYPE_IMAGE
:
6054 case GLSL_TYPE_ATOMIC_UINT
:
6063 ast_type_specifier::hir(exec_list
*instructions
,
6064 struct _mesa_glsl_parse_state
*state
)
6066 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6069 YYLTYPE loc
= this->get_location();
6071 /* If this is a precision statement, check that the type to which it is
6072 * applied is either float or int.
6074 * From section 4.5.3 of the GLSL 1.30 spec:
6075 * "The precision statement
6076 * precision precision-qualifier type;
6077 * can be used to establish a default precision qualifier. The type
6078 * field can be either int or float [...]. Any other types or
6079 * qualifiers will result in an error.
6081 if (this->default_precision
!= ast_precision_none
) {
6082 if (!state
->check_precision_qualifiers_allowed(&loc
))
6085 if (this->structure
!= NULL
) {
6086 _mesa_glsl_error(&loc
, state
,
6087 "precision qualifiers do not apply to structures");
6091 if (this->array_specifier
!= NULL
) {
6092 _mesa_glsl_error(&loc
, state
,
6093 "default precision statements do not apply to "
6098 const struct glsl_type
*const type
=
6099 state
->symbols
->get_type(this->type_name
);
6100 if (!is_valid_default_precision_type(type
)) {
6101 _mesa_glsl_error(&loc
, state
,
6102 "default precision statements apply only to "
6103 "float, int, and opaque types");
6107 if (state
->es_shader
) {
6108 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6111 * "Non-precision qualified declarations will use the precision
6112 * qualifier specified in the most recent precision statement
6113 * that is still in scope. The precision statement has the same
6114 * scoping rules as variable declarations. If it is declared
6115 * inside a compound statement, its effect stops at the end of
6116 * the innermost statement it was declared in. Precision
6117 * statements in nested scopes override precision statements in
6118 * outer scopes. Multiple precision statements for the same basic
6119 * type can appear inside the same scope, with later statements
6120 * overriding earlier statements within that scope."
6122 * Default precision specifications follow the same scope rules as
6123 * variables. So, we can track the state of the default precision
6124 * qualifiers in the symbol table, and the rules will just work. This
6125 * is a slight abuse of the symbol table, but it has the semantics
6128 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6129 this->default_precision
);
6132 /* FINISHME: Translate precision statements into IR. */
6136 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6137 * process_record_constructor() can do type-checking on C-style initializer
6138 * expressions of structs, but ast_struct_specifier should only be translated
6139 * to HIR if it is declaring the type of a structure.
6141 * The ->is_declaration field is false for initializers of variables
6142 * declared separately from the struct's type definition.
6144 * struct S { ... }; (is_declaration = true)
6145 * struct T { ... } t = { ... }; (is_declaration = true)
6146 * S s = { ... }; (is_declaration = false)
6148 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6149 return this->structure
->hir(instructions
, state
);
6156 * Process a structure or interface block tree into an array of structure fields
6158 * After parsing, where there are some syntax differnces, structures and
6159 * interface blocks are almost identical. They are similar enough that the
6160 * AST for each can be processed the same way into a set of
6161 * \c glsl_struct_field to describe the members.
6163 * If we're processing an interface block, var_mode should be the type of the
6164 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6165 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6169 * The number of fields processed. A pointer to the array structure fields is
6170 * stored in \c *fields_ret.
6173 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6174 struct _mesa_glsl_parse_state
*state
,
6175 exec_list
*declarations
,
6176 glsl_struct_field
**fields_ret
,
6178 enum glsl_matrix_layout matrix_layout
,
6179 bool allow_reserved_names
,
6180 ir_variable_mode var_mode
,
6181 ast_type_qualifier
*layout
,
6182 unsigned block_stream
,
6183 unsigned expl_location
)
6185 unsigned decl_count
= 0;
6187 /* Make an initial pass over the list of fields to determine how
6188 * many there are. Each element in this list is an ast_declarator_list.
6189 * This means that we actually need to count the number of elements in the
6190 * 'declarations' list in each of the elements.
6192 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6193 decl_count
+= decl_list
->declarations
.length();
6196 /* Allocate storage for the fields and process the field
6197 * declarations. As the declarations are processed, try to also convert
6198 * the types to HIR. This ensures that structure definitions embedded in
6199 * other structure definitions or in interface blocks are processed.
6201 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6204 bool first_member
= true;
6205 bool first_member_has_explicit_location
;
6208 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6209 const char *type_name
;
6210 YYLTYPE loc
= decl_list
->get_location();
6212 decl_list
->type
->specifier
->hir(instructions
, state
);
6214 /* Section 10.9 of the GLSL ES 1.00 specification states that
6215 * embedded structure definitions have been removed from the language.
6217 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
6218 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
6219 "not allowed in GLSL ES 1.00");
6222 const glsl_type
*decl_type
=
6223 decl_list
->type
->glsl_type(& type_name
, state
);
6225 const struct ast_type_qualifier
*const qual
=
6226 &decl_list
->type
->qualifier
;
6228 /* From section 4.3.9 of the GLSL 4.40 spec:
6230 * "[In interface blocks] opaque types are not allowed."
6232 * It should be impossible for decl_type to be NULL here. Cases that
6233 * might naturally lead to decl_type being NULL, especially for the
6234 * is_interface case, will have resulted in compilation having
6235 * already halted due to a syntax error.
6239 if (is_interface
&& decl_type
->contains_opaque()) {
6240 _mesa_glsl_error(&loc
, state
,
6241 "uniform/buffer in non-default interface block contains "
6245 if (decl_type
->contains_atomic()) {
6246 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6248 * "Members of structures cannot be declared as atomic counter
6251 _mesa_glsl_error(&loc
, state
, "atomic counter in structure, "
6252 "shader storage block or uniform block");
6255 if (decl_type
->contains_image()) {
6256 /* FINISHME: Same problem as with atomic counters.
6257 * FINISHME: Request clarification from Khronos and add
6258 * FINISHME: spec quotation here.
6260 _mesa_glsl_error(&loc
, state
,
6261 "image in structure, shader storage block or "
6265 if (qual
->flags
.q
.explicit_binding
) {
6266 _mesa_glsl_error(&loc
, state
,
6267 "binding layout qualifier cannot be applied "
6268 "to struct or interface block members");
6272 if (!first_member
) {
6273 if (!layout
->flags
.q
.explicit_location
&&
6274 ((first_member_has_explicit_location
&&
6275 !qual
->flags
.q
.explicit_location
) ||
6276 (!first_member_has_explicit_location
&&
6277 qual
->flags
.q
.explicit_location
))) {
6278 _mesa_glsl_error(&loc
, state
,
6279 "when block-level location layout qualifier "
6280 "is not supplied either all members must "
6281 "have a location layout qualifier or all "
6282 "members must not have a location layout "
6286 first_member
= false;
6287 first_member_has_explicit_location
=
6288 qual
->flags
.q
.explicit_location
;
6292 if (qual
->flags
.q
.std140
||
6293 qual
->flags
.q
.std430
||
6294 qual
->flags
.q
.packed
||
6295 qual
->flags
.q
.shared
) {
6296 _mesa_glsl_error(&loc
, state
,
6297 "uniform/shader storage block layout qualifiers "
6298 "std140, std430, packed, and shared can only be "
6299 "applied to uniform/shader storage blocks, not "
6303 if (qual
->flags
.q
.constant
) {
6304 _mesa_glsl_error(&loc
, state
,
6305 "const storage qualifier cannot be applied "
6306 "to struct or interface block members");
6309 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6311 * "A block member may be declared with a stream identifier, but
6312 * the specified stream must match the stream associated with the
6313 * containing block."
6315 if (qual
->flags
.q
.explicit_stream
) {
6316 unsigned qual_stream
;
6317 if (process_qualifier_constant(state
, &loc
, "stream",
6318 qual
->stream
, &qual_stream
) &&
6319 qual_stream
!= block_stream
) {
6320 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6321 "interface block member does not match "
6322 "the interface block (%d vs %d)", qual
->stream
,
6327 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6328 _mesa_glsl_error(&loc
, state
,
6329 "interpolation qualifiers cannot be used "
6330 "with uniform interface blocks");
6333 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6334 qual
->has_auxiliary_storage()) {
6335 _mesa_glsl_error(&loc
, state
,
6336 "auxiliary storage qualifiers cannot be used "
6337 "in uniform blocks or structures.");
6340 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6341 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6342 _mesa_glsl_error(&loc
, state
,
6343 "row_major and column_major can only be "
6344 "applied to interface blocks");
6346 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6349 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6350 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6351 "readonly and writeonly.");
6354 foreach_list_typed (ast_declaration
, decl
, link
,
6355 &decl_list
->declarations
) {
6356 YYLTYPE loc
= decl
->get_location();
6358 if (!allow_reserved_names
)
6359 validate_identifier(decl
->identifier
, loc
, state
);
6361 const struct glsl_type
*field_type
=
6362 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6363 validate_array_dimensions(field_type
, state
, &loc
);
6364 fields
[i
].type
= field_type
;
6365 fields
[i
].name
= decl
->identifier
;
6366 fields
[i
].interpolation
=
6367 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
6368 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6369 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6370 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6371 fields
[i
].precision
= qual
->precision
;
6373 if (qual
->flags
.q
.explicit_location
) {
6374 unsigned qual_location
;
6375 if (process_qualifier_constant(state
, &loc
, "location",
6376 qual
->location
, &qual_location
)) {
6377 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6378 expl_location
= fields
[i
].location
+ 1;
6381 if (layout
&& layout
->flags
.q
.explicit_location
) {
6382 fields
[i
].location
= expl_location
;
6383 expl_location
= expl_location
+ 1;
6385 fields
[i
].location
= -1;
6389 /* Propogate row- / column-major information down the fields of the
6390 * structure or interface block. Structures need this data because
6391 * the structure may contain a structure that contains ... a matrix
6392 * that need the proper layout.
6394 if (field_type
->without_array()->is_matrix()
6395 || field_type
->without_array()->is_record()) {
6396 /* If no layout is specified for the field, inherit the layout
6399 fields
[i
].matrix_layout
= matrix_layout
;
6401 if (qual
->flags
.q
.row_major
)
6402 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6403 else if (qual
->flags
.q
.column_major
)
6404 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6406 /* If we're processing an interface block, the matrix layout must
6407 * be decided by this point.
6409 assert(!is_interface
6410 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6411 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6414 /* Image qualifiers are allowed on buffer variables, which can only
6415 * be defined inside shader storage buffer objects
6417 if (layout
&& var_mode
== ir_var_shader_storage
) {
6418 /* For readonly and writeonly qualifiers the field definition,
6419 * if set, overwrites the layout qualifier.
6421 if (qual
->flags
.q
.read_only
) {
6422 fields
[i
].image_read_only
= true;
6423 fields
[i
].image_write_only
= false;
6424 } else if (qual
->flags
.q
.write_only
) {
6425 fields
[i
].image_read_only
= false;
6426 fields
[i
].image_write_only
= true;
6428 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6429 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6432 /* For other qualifiers, we set the flag if either the layout
6433 * qualifier or the field qualifier are set
6435 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6436 layout
->flags
.q
.coherent
;
6437 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6438 layout
->flags
.q
._volatile
;
6439 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6440 layout
->flags
.q
.restrict_flag
;
6447 assert(i
== decl_count
);
6449 *fields_ret
= fields
;
6455 ast_struct_specifier::hir(exec_list
*instructions
,
6456 struct _mesa_glsl_parse_state
*state
)
6458 YYLTYPE loc
= this->get_location();
6460 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6462 * "Anonymous structures are not supported; so embedded structures must
6463 * have a declarator. A name given to an embedded struct is scoped at
6464 * the same level as the struct it is embedded in."
6466 * The same section of the GLSL 1.20 spec says:
6468 * "Anonymous structures are not supported. Embedded structures are not
6471 * struct S { float f; };
6473 * S; // Error: anonymous structures disallowed
6474 * struct { ... }; // Error: embedded structures disallowed
6475 * S s; // Okay: nested structures with name are allowed
6478 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
6479 * we allow embedded structures in 1.10 only.
6481 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
6482 _mesa_glsl_error(&loc
, state
,
6483 "embedded structure declarations are not allowed");
6485 state
->struct_specifier_depth
++;
6487 unsigned expl_location
= -1;
6488 if (layout
&& layout
->flags
.q
.explicit_location
) {
6489 if (!process_qualifier_constant(state
, &loc
, "location",
6490 layout
->location
, &expl_location
)) {
6493 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6497 glsl_struct_field
*fields
;
6498 unsigned decl_count
=
6499 ast_process_struct_or_iface_block_members(instructions
,
6501 &this->declarations
,
6504 GLSL_MATRIX_LAYOUT_INHERITED
,
6505 false /* allow_reserved_names */,
6508 0, /* for interface only */
6511 validate_identifier(this->name
, loc
, state
);
6513 const glsl_type
*t
=
6514 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6516 if (!state
->symbols
->add_type(name
, t
)) {
6517 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6519 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6521 state
->num_user_structures
+ 1);
6523 s
[state
->num_user_structures
] = t
;
6524 state
->user_structures
= s
;
6525 state
->num_user_structures
++;
6529 state
->struct_specifier_depth
--;
6531 /* Structure type definitions do not have r-values.
6538 * Visitor class which detects whether a given interface block has been used.
6540 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6543 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6544 : mode(mode
), block(block
), found(false)
6548 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6550 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6554 return visit_continue
;
6557 bool usage_found() const
6563 ir_variable_mode mode
;
6564 const glsl_type
*block
;
6569 is_unsized_array_last_element(ir_variable
*v
)
6571 const glsl_type
*interface_type
= v
->get_interface_type();
6572 int length
= interface_type
->length
;
6574 assert(v
->type
->is_unsized_array());
6576 /* Check if it is the last element of the interface */
6577 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6583 ast_interface_block::hir(exec_list
*instructions
,
6584 struct _mesa_glsl_parse_state
*state
)
6586 YYLTYPE loc
= this->get_location();
6588 /* Interface blocks must be declared at global scope */
6589 if (state
->current_function
!= NULL
) {
6590 _mesa_glsl_error(&loc
, state
,
6591 "Interface block `%s' must be declared "
6596 if (!this->layout
.flags
.q
.buffer
&&
6597 this->layout
.flags
.q
.std430
) {
6598 _mesa_glsl_error(&loc
, state
,
6599 "std430 storage block layout qualifier is supported "
6600 "only for shader storage blocks");
6603 /* The ast_interface_block has a list of ast_declarator_lists. We
6604 * need to turn those into ir_variables with an association
6605 * with this uniform block.
6607 enum glsl_interface_packing packing
;
6608 if (this->layout
.flags
.q
.shared
) {
6609 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6610 } else if (this->layout
.flags
.q
.packed
) {
6611 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6612 } else if (this->layout
.flags
.q
.std430
) {
6613 packing
= GLSL_INTERFACE_PACKING_STD430
;
6615 /* The default layout is std140.
6617 packing
= GLSL_INTERFACE_PACKING_STD140
;
6620 ir_variable_mode var_mode
;
6621 const char *iface_type_name
;
6622 if (this->layout
.flags
.q
.in
) {
6623 var_mode
= ir_var_shader_in
;
6624 iface_type_name
= "in";
6625 } else if (this->layout
.flags
.q
.out
) {
6626 var_mode
= ir_var_shader_out
;
6627 iface_type_name
= "out";
6628 } else if (this->layout
.flags
.q
.uniform
) {
6629 var_mode
= ir_var_uniform
;
6630 iface_type_name
= "uniform";
6631 } else if (this->layout
.flags
.q
.buffer
) {
6632 var_mode
= ir_var_shader_storage
;
6633 iface_type_name
= "buffer";
6635 var_mode
= ir_var_auto
;
6636 iface_type_name
= "UNKNOWN";
6637 assert(!"interface block layout qualifier not found!");
6640 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6641 if (this->layout
.flags
.q
.row_major
)
6642 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6643 else if (this->layout
.flags
.q
.column_major
)
6644 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6646 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6647 exec_list declared_variables
;
6648 glsl_struct_field
*fields
;
6650 /* Treat an interface block as one level of nesting, so that embedded struct
6651 * specifiers will be disallowed.
6653 state
->struct_specifier_depth
++;
6655 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
6656 * that we don't have incompatible qualifiers
6658 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
6659 _mesa_glsl_error(&loc
, state
,
6660 "Interface block sets both readonly and writeonly");
6663 unsigned qual_stream
;
6664 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
6666 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
6667 /* If the stream qualifier is invalid it doesn't make sense to continue
6668 * on and try to compare stream layouts on member variables against it
6669 * so just return early.
6674 unsigned expl_location
= -1;
6675 if (layout
.flags
.q
.explicit_location
) {
6676 if (!process_qualifier_constant(state
, &loc
, "location",
6677 layout
.location
, &expl_location
)) {
6680 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6684 unsigned int num_variables
=
6685 ast_process_struct_or_iface_block_members(&declared_variables
,
6687 &this->declarations
,
6691 redeclaring_per_vertex
,
6697 state
->struct_specifier_depth
--;
6699 if (!redeclaring_per_vertex
) {
6700 validate_identifier(this->block_name
, loc
, state
);
6702 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
6704 * "Block names have no other use within a shader beyond interface
6705 * matching; it is a compile-time error to use a block name at global
6706 * scope for anything other than as a block name."
6708 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
6709 if (var
&& !var
->type
->is_interface()) {
6710 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
6711 "already used in the scope.",
6716 const glsl_type
*earlier_per_vertex
= NULL
;
6717 if (redeclaring_per_vertex
) {
6718 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
6719 * the named interface block gl_in, we can find it by looking at the
6720 * previous declaration of gl_in. Otherwise we can find it by looking
6721 * at the previous decalartion of any of the built-in outputs,
6724 * Also check that the instance name and array-ness of the redeclaration
6728 case ir_var_shader_in
:
6729 if (ir_variable
*earlier_gl_in
=
6730 state
->symbols
->get_variable("gl_in")) {
6731 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6733 _mesa_glsl_error(&loc
, state
,
6734 "redeclaration of gl_PerVertex input not allowed "
6736 _mesa_shader_stage_to_string(state
->stage
));
6738 if (this->instance_name
== NULL
||
6739 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
6740 !this->array_specifier
->is_single_dimension()) {
6741 _mesa_glsl_error(&loc
, state
,
6742 "gl_PerVertex input must be redeclared as "
6746 case ir_var_shader_out
:
6747 if (ir_variable
*earlier_gl_Position
=
6748 state
->symbols
->get_variable("gl_Position")) {
6749 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6750 } else if (ir_variable
*earlier_gl_out
=
6751 state
->symbols
->get_variable("gl_out")) {
6752 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6754 _mesa_glsl_error(&loc
, state
,
6755 "redeclaration of gl_PerVertex output not "
6756 "allowed in the %s shader",
6757 _mesa_shader_stage_to_string(state
->stage
));
6759 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6760 if (this->instance_name
== NULL
||
6761 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6762 _mesa_glsl_error(&loc
, state
,
6763 "gl_PerVertex output must be redeclared as "
6767 if (this->instance_name
!= NULL
) {
6768 _mesa_glsl_error(&loc
, state
,
6769 "gl_PerVertex output may not be redeclared with "
6770 "an instance name");
6775 _mesa_glsl_error(&loc
, state
,
6776 "gl_PerVertex must be declared as an input or an "
6781 if (earlier_per_vertex
== NULL
) {
6782 /* An error has already been reported. Bail out to avoid null
6783 * dereferences later in this function.
6788 /* Copy locations from the old gl_PerVertex interface block. */
6789 for (unsigned i
= 0; i
< num_variables
; i
++) {
6790 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6792 _mesa_glsl_error(&loc
, state
,
6793 "redeclaration of gl_PerVertex must be a subset "
6794 "of the built-in members of gl_PerVertex");
6796 fields
[i
].location
=
6797 earlier_per_vertex
->fields
.structure
[j
].location
;
6798 fields
[i
].interpolation
=
6799 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6800 fields
[i
].centroid
=
6801 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6803 earlier_per_vertex
->fields
.structure
[j
].sample
;
6805 earlier_per_vertex
->fields
.structure
[j
].patch
;
6806 fields
[i
].precision
=
6807 earlier_per_vertex
->fields
.structure
[j
].precision
;
6811 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
6814 * If a built-in interface block is redeclared, it must appear in
6815 * the shader before any use of any member included in the built-in
6816 * declaration, or a compilation error will result.
6818 * This appears to be a clarification to the behaviour established for
6819 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
6820 * regardless of GLSL version.
6822 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
6823 v
.run(instructions
);
6824 if (v
.usage_found()) {
6825 _mesa_glsl_error(&loc
, state
,
6826 "redeclaration of a built-in interface block must "
6827 "appear before any use of any member of the "
6832 const glsl_type
*block_type
=
6833 glsl_type::get_interface_instance(fields
,
6838 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
6839 YYLTYPE loc
= this->get_location();
6840 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
6841 "already taken in the current scope",
6842 this->block_name
, iface_type_name
);
6845 /* Since interface blocks cannot contain statements, it should be
6846 * impossible for the block to generate any instructions.
6848 assert(declared_variables
.is_empty());
6850 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
6852 * Geometry shader input variables get the per-vertex values written
6853 * out by vertex shader output variables of the same names. Since a
6854 * geometry shader operates on a set of vertices, each input varying
6855 * variable (or input block, see interface blocks below) needs to be
6856 * declared as an array.
6858 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
6859 var_mode
== ir_var_shader_in
) {
6860 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
6861 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6862 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
6863 this->array_specifier
== NULL
&&
6864 var_mode
== ir_var_shader_in
) {
6865 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
6866 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
6867 this->array_specifier
== NULL
&&
6868 var_mode
== ir_var_shader_out
) {
6869 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
6873 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
6876 * "If an instance name (instance-name) is used, then it puts all the
6877 * members inside a scope within its own name space, accessed with the
6878 * field selector ( . ) operator (analogously to structures)."
6880 if (this->instance_name
) {
6881 if (redeclaring_per_vertex
) {
6882 /* When a built-in in an unnamed interface block is redeclared,
6883 * get_variable_being_redeclared() calls
6884 * check_builtin_array_max_size() to make sure that built-in array
6885 * variables aren't redeclared to illegal sizes. But we're looking
6886 * at a redeclaration of a named built-in interface block. So we
6887 * have to manually call check_builtin_array_max_size() for all parts
6888 * of the interface that are arrays.
6890 for (unsigned i
= 0; i
< num_variables
; i
++) {
6891 if (fields
[i
].type
->is_array()) {
6892 const unsigned size
= fields
[i
].type
->array_size();
6893 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
6897 validate_identifier(this->instance_name
, loc
, state
);
6902 if (this->array_specifier
!= NULL
) {
6903 const glsl_type
*block_array_type
=
6904 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
6906 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
6908 * For uniform blocks declared an array, each individual array
6909 * element corresponds to a separate buffer object backing one
6910 * instance of the block. As the array size indicates the number
6911 * of buffer objects needed, uniform block array declarations
6912 * must specify an array size.
6914 * And a few paragraphs later:
6916 * Geometry shader input blocks must be declared as arrays and
6917 * follow the array declaration and linking rules for all
6918 * geometry shader inputs. All other input and output block
6919 * arrays must specify an array size.
6921 * The same applies to tessellation shaders.
6923 * The upshot of this is that the only circumstance where an
6924 * interface array size *doesn't* need to be specified is on a
6925 * geometry shader input, tessellation control shader input,
6926 * tessellation control shader output, and tessellation evaluation
6929 if (block_array_type
->is_unsized_array()) {
6930 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
6931 state
->stage
== MESA_SHADER_TESS_CTRL
||
6932 state
->stage
== MESA_SHADER_TESS_EVAL
;
6933 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
6935 if (this->layout
.flags
.q
.in
) {
6937 _mesa_glsl_error(&loc
, state
,
6938 "unsized input block arrays not allowed in "
6940 _mesa_shader_stage_to_string(state
->stage
));
6941 } else if (this->layout
.flags
.q
.out
) {
6943 _mesa_glsl_error(&loc
, state
,
6944 "unsized output block arrays not allowed in "
6946 _mesa_shader_stage_to_string(state
->stage
));
6948 /* by elimination, this is a uniform block array */
6949 _mesa_glsl_error(&loc
, state
,
6950 "unsized uniform block arrays not allowed in "
6952 _mesa_shader_stage_to_string(state
->stage
));
6956 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
6958 * * Arrays of arrays of blocks are not allowed
6960 if (state
->es_shader
&& block_array_type
->is_array() &&
6961 block_array_type
->fields
.array
->is_array()) {
6962 _mesa_glsl_error(&loc
, state
,
6963 "arrays of arrays interface blocks are "
6967 var
= new(state
) ir_variable(block_array_type
,
6968 this->instance_name
,
6971 var
= new(state
) ir_variable(block_type
,
6972 this->instance_name
,
6976 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
6977 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
6979 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
6980 var
->data
.read_only
= true;
6982 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
6983 handle_geometry_shader_input_decl(state
, loc
, var
);
6984 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6985 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
6986 handle_tess_shader_input_decl(state
, loc
, var
);
6987 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
6988 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
6990 for (unsigned i
= 0; i
< num_variables
; i
++) {
6991 if (fields
[i
].type
->is_unsized_array()) {
6992 if (var_mode
== ir_var_shader_storage
) {
6993 if (i
!= (num_variables
- 1)) {
6994 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6995 "only last member of a shader storage block "
6996 "can be defined as unsized array",
7000 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7002 * "If an array is declared as the last member of a shader storage
7003 * block and the size is not specified at compile-time, it is
7004 * sized at run-time. In all other cases, arrays are sized only
7007 if (state
->es_shader
) {
7008 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7009 "only last member of a shader storage block "
7010 "can be defined as unsized array",
7017 if (ir_variable
*earlier
=
7018 state
->symbols
->get_variable(this->instance_name
)) {
7019 if (!redeclaring_per_vertex
) {
7020 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7021 this->instance_name
);
7023 earlier
->data
.how_declared
= ir_var_declared_normally
;
7024 earlier
->type
= var
->type
;
7025 earlier
->reinit_interface_type(block_type
);
7028 if (this->layout
.flags
.q
.explicit_binding
) {
7029 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7033 var
->data
.stream
= qual_stream
;
7034 if (layout
.flags
.q
.explicit_location
) {
7035 var
->data
.location
= expl_location
;
7036 var
->data
.explicit_location
= true;
7039 state
->symbols
->add_variable(var
);
7040 instructions
->push_tail(var
);
7043 /* In order to have an array size, the block must also be declared with
7046 assert(this->array_specifier
== NULL
);
7048 for (unsigned i
= 0; i
< num_variables
; i
++) {
7050 new(state
) ir_variable(fields
[i
].type
,
7051 ralloc_strdup(state
, fields
[i
].name
),
7053 var
->data
.interpolation
= fields
[i
].interpolation
;
7054 var
->data
.centroid
= fields
[i
].centroid
;
7055 var
->data
.sample
= fields
[i
].sample
;
7056 var
->data
.patch
= fields
[i
].patch
;
7057 var
->data
.stream
= qual_stream
;
7058 var
->data
.location
= fields
[i
].location
;
7059 if (fields
[i
].location
!= -1)
7060 var
->data
.explicit_location
= true;
7061 var
->init_interface_type(block_type
);
7063 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7064 var
->data
.read_only
= true;
7066 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7067 if (state
->es_shader
) {
7068 var
->data
.precision
=
7069 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7073 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7074 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7075 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7077 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7080 if (var
->data
.mode
== ir_var_shader_storage
) {
7081 var
->data
.image_read_only
= fields
[i
].image_read_only
;
7082 var
->data
.image_write_only
= fields
[i
].image_write_only
;
7083 var
->data
.image_coherent
= fields
[i
].image_coherent
;
7084 var
->data
.image_volatile
= fields
[i
].image_volatile
;
7085 var
->data
.image_restrict
= fields
[i
].image_restrict
;
7088 /* Examine var name here since var may get deleted in the next call */
7089 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7091 if (redeclaring_per_vertex
) {
7092 ir_variable
*earlier
=
7093 get_variable_being_redeclared(var
, loc
, state
,
7094 true /* allow_all_redeclarations */);
7095 if (!var_is_gl_id
|| earlier
== NULL
) {
7096 _mesa_glsl_error(&loc
, state
,
7097 "redeclaration of gl_PerVertex can only "
7098 "include built-in variables");
7099 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7100 _mesa_glsl_error(&loc
, state
,
7101 "`%s' has already been redeclared",
7104 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7105 earlier
->reinit_interface_type(block_type
);
7110 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7111 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7113 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7114 * The UBO declaration itself doesn't get an ir_variable unless it
7115 * has an instance name. This is ugly.
7117 if (this->layout
.flags
.q
.explicit_binding
) {
7118 apply_explicit_binding(state
, &loc
, var
,
7119 var
->get_interface_type(), &this->layout
);
7122 if (var
->type
->is_unsized_array()) {
7123 if (var
->is_in_shader_storage_block()) {
7124 if (!is_unsized_array_last_element(var
)) {
7125 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7126 "only last member of a shader storage block "
7127 "can be defined as unsized array",
7130 var
->data
.from_ssbo_unsized_array
= true;
7132 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7134 * "If an array is declared as the last member of a shader storage
7135 * block and the size is not specified at compile-time, it is
7136 * sized at run-time. In all other cases, arrays are sized only
7139 if (state
->es_shader
) {
7140 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7141 "only last member of a shader storage block "
7142 "can be defined as unsized array",
7148 state
->symbols
->add_variable(var
);
7149 instructions
->push_tail(var
);
7152 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7153 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7155 * It is also a compilation error ... to redeclare a built-in
7156 * block and then use a member from that built-in block that was
7157 * not included in the redeclaration.
7159 * This appears to be a clarification to the behaviour established
7160 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7161 * behaviour regardless of GLSL version.
7163 * To prevent the shader from using a member that was not included in
7164 * the redeclaration, we disable any ir_variables that are still
7165 * associated with the old declaration of gl_PerVertex (since we've
7166 * already updated all of the variables contained in the new
7167 * gl_PerVertex to point to it).
7169 * As a side effect this will prevent
7170 * validate_intrastage_interface_blocks() from getting confused and
7171 * thinking there are conflicting definitions of gl_PerVertex in the
7174 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7175 ir_variable
*const var
= node
->as_variable();
7177 var
->get_interface_type() == earlier_per_vertex
&&
7178 var
->data
.mode
== var_mode
) {
7179 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7180 _mesa_glsl_error(&loc
, state
,
7181 "redeclaration of gl_PerVertex cannot "
7182 "follow a redeclaration of `%s'",
7185 state
->symbols
->disable_variable(var
->name
);
7197 ast_tcs_output_layout::hir(exec_list
*instructions
,
7198 struct _mesa_glsl_parse_state
*state
)
7200 YYLTYPE loc
= this->get_location();
7202 unsigned num_vertices
;
7203 if (!state
->out_qualifier
->vertices
->
7204 process_qualifier_constant(state
, "vertices", &num_vertices
,
7206 /* return here to stop cascading incorrect error messages */
7210 /* If any shader outputs occurred before this declaration and specified an
7211 * array size, make sure the size they specified is consistent with the
7214 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7215 _mesa_glsl_error(&loc
, state
,
7216 "this tessellation control shader output layout "
7217 "specifies %u vertices, but a previous output "
7218 "is declared with size %u",
7219 num_vertices
, state
->tcs_output_size
);
7223 state
->tcs_output_vertices_specified
= true;
7225 /* If any shader outputs occurred before this declaration and did not
7226 * specify an array size, their size is determined now.
7228 foreach_in_list (ir_instruction
, node
, instructions
) {
7229 ir_variable
*var
= node
->as_variable();
7230 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7233 /* Note: Not all tessellation control shader output are arrays. */
7234 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7237 if (var
->data
.max_array_access
>= num_vertices
) {
7238 _mesa_glsl_error(&loc
, state
,
7239 "this tessellation control shader output layout "
7240 "specifies %u vertices, but an access to element "
7241 "%u of output `%s' already exists", num_vertices
,
7242 var
->data
.max_array_access
, var
->name
);
7244 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7254 ast_gs_input_layout::hir(exec_list
*instructions
,
7255 struct _mesa_glsl_parse_state
*state
)
7257 YYLTYPE loc
= this->get_location();
7259 /* If any geometry input layout declaration preceded this one, make sure it
7260 * was consistent with this one.
7262 if (state
->gs_input_prim_type_specified
&&
7263 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7264 _mesa_glsl_error(&loc
, state
,
7265 "geometry shader input layout does not match"
7266 " previous declaration");
7270 /* If any shader inputs occurred before this declaration and specified an
7271 * array size, make sure the size they specified is consistent with the
7274 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7275 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7276 _mesa_glsl_error(&loc
, state
,
7277 "this geometry shader input layout implies %u vertices"
7278 " per primitive, but a previous input is declared"
7279 " with size %u", num_vertices
, state
->gs_input_size
);
7283 state
->gs_input_prim_type_specified
= true;
7285 /* If any shader inputs occurred before this declaration and did not
7286 * specify an array size, their size is determined now.
7288 foreach_in_list(ir_instruction
, node
, instructions
) {
7289 ir_variable
*var
= node
->as_variable();
7290 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7293 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7297 if (var
->type
->is_unsized_array()) {
7298 if (var
->data
.max_array_access
>= num_vertices
) {
7299 _mesa_glsl_error(&loc
, state
,
7300 "this geometry shader input layout implies %u"
7301 " vertices, but an access to element %u of input"
7302 " `%s' already exists", num_vertices
,
7303 var
->data
.max_array_access
, var
->name
);
7305 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7316 ast_cs_input_layout::hir(exec_list
*instructions
,
7317 struct _mesa_glsl_parse_state
*state
)
7319 YYLTYPE loc
= this->get_location();
7321 /* From the ARB_compute_shader specification:
7323 * If the local size of the shader in any dimension is greater
7324 * than the maximum size supported by the implementation for that
7325 * dimension, a compile-time error results.
7327 * It is not clear from the spec how the error should be reported if
7328 * the total size of the work group exceeds
7329 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7330 * report it at compile time as well.
7332 GLuint64 total_invocations
= 1;
7333 unsigned qual_local_size
[3];
7334 for (int i
= 0; i
< 3; i
++) {
7336 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7338 /* Infer a local_size of 1 for unspecified dimensions */
7339 if (this->local_size
[i
] == NULL
) {
7340 qual_local_size
[i
] = 1;
7341 } else if (!this->local_size
[i
]->
7342 process_qualifier_constant(state
, local_size_str
,
7343 &qual_local_size
[i
], false)) {
7344 ralloc_free(local_size_str
);
7347 ralloc_free(local_size_str
);
7349 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7350 _mesa_glsl_error(&loc
, state
,
7351 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7353 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7356 total_invocations
*= qual_local_size
[i
];
7357 if (total_invocations
>
7358 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7359 _mesa_glsl_error(&loc
, state
,
7360 "product of local_sizes exceeds "
7361 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7362 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7367 /* If any compute input layout declaration preceded this one, make sure it
7368 * was consistent with this one.
7370 if (state
->cs_input_local_size_specified
) {
7371 for (int i
= 0; i
< 3; i
++) {
7372 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7373 _mesa_glsl_error(&loc
, state
,
7374 "compute shader input layout does not match"
7375 " previous declaration");
7381 state
->cs_input_local_size_specified
= true;
7382 for (int i
= 0; i
< 3; i
++)
7383 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7385 /* We may now declare the built-in constant gl_WorkGroupSize (see
7386 * builtin_variable_generator::generate_constants() for why we didn't
7387 * declare it earlier).
7389 ir_variable
*var
= new(state
->symbols
)
7390 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7391 var
->data
.how_declared
= ir_var_declared_implicitly
;
7392 var
->data
.read_only
= true;
7393 instructions
->push_tail(var
);
7394 state
->symbols
->add_variable(var
);
7395 ir_constant_data data
;
7396 memset(&data
, 0, sizeof(data
));
7397 for (int i
= 0; i
< 3; i
++)
7398 data
.u
[i
] = qual_local_size
[i
];
7399 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7400 var
->constant_initializer
=
7401 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7402 var
->data
.has_initializer
= true;
7409 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7410 exec_list
*instructions
)
7412 bool gl_FragColor_assigned
= false;
7413 bool gl_FragData_assigned
= false;
7414 bool gl_FragSecondaryColor_assigned
= false;
7415 bool gl_FragSecondaryData_assigned
= false;
7416 bool user_defined_fs_output_assigned
= false;
7417 ir_variable
*user_defined_fs_output
= NULL
;
7419 /* It would be nice to have proper location information. */
7421 memset(&loc
, 0, sizeof(loc
));
7423 foreach_in_list(ir_instruction
, node
, instructions
) {
7424 ir_variable
*var
= node
->as_variable();
7426 if (!var
|| !var
->data
.assigned
)
7429 if (strcmp(var
->name
, "gl_FragColor") == 0)
7430 gl_FragColor_assigned
= true;
7431 else if (strcmp(var
->name
, "gl_FragData") == 0)
7432 gl_FragData_assigned
= true;
7433 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7434 gl_FragSecondaryColor_assigned
= true;
7435 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7436 gl_FragSecondaryData_assigned
= true;
7437 else if (!is_gl_identifier(var
->name
)) {
7438 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7439 var
->data
.mode
== ir_var_shader_out
) {
7440 user_defined_fs_output_assigned
= true;
7441 user_defined_fs_output
= var
;
7446 /* From the GLSL 1.30 spec:
7448 * "If a shader statically assigns a value to gl_FragColor, it
7449 * may not assign a value to any element of gl_FragData. If a
7450 * shader statically writes a value to any element of
7451 * gl_FragData, it may not assign a value to
7452 * gl_FragColor. That is, a shader may assign values to either
7453 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7454 * linked together must also consistently write just one of
7455 * these variables. Similarly, if user declared output
7456 * variables are in use (statically assigned to), then the
7457 * built-in variables gl_FragColor and gl_FragData may not be
7458 * assigned to. These incorrect usages all generate compile
7461 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7462 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7463 "`gl_FragColor' and `gl_FragData'");
7464 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7465 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7466 "`gl_FragColor' and `%s'",
7467 user_defined_fs_output
->name
);
7468 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7469 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7470 "`gl_FragSecondaryColorEXT' and"
7471 " `gl_FragSecondaryDataEXT'");
7472 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7473 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7474 "`gl_FragColor' and"
7475 " `gl_FragSecondaryDataEXT'");
7476 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7477 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7479 " `gl_FragSecondaryColorEXT'");
7480 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7481 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7482 "`gl_FragData' and `%s'",
7483 user_defined_fs_output
->name
);
7486 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7487 !state
->EXT_blend_func_extended_enable
) {
7488 _mesa_glsl_error(&loc
, state
,
7489 "Dual source blending requires EXT_blend_func_extended");
7495 remove_per_vertex_blocks(exec_list
*instructions
,
7496 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7498 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7499 * if it exists in this shader type.
7501 const glsl_type
*per_vertex
= NULL
;
7503 case ir_var_shader_in
:
7504 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7505 per_vertex
= gl_in
->get_interface_type();
7507 case ir_var_shader_out
:
7508 if (ir_variable
*gl_Position
=
7509 state
->symbols
->get_variable("gl_Position")) {
7510 per_vertex
= gl_Position
->get_interface_type();
7514 assert(!"Unexpected mode");
7518 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7519 * need to do anything.
7521 if (per_vertex
== NULL
)
7524 /* If the interface block is used by the shader, then we don't need to do
7527 interface_block_usage_visitor
v(mode
, per_vertex
);
7528 v
.run(instructions
);
7529 if (v
.usage_found())
7532 /* Remove any ir_variable declarations that refer to the interface block
7535 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7536 ir_variable
*const var
= node
->as_variable();
7537 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
7538 var
->data
.mode
== mode
) {
7539 state
->symbols
->disable_variable(var
->name
);