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_FUNCTION
:
1092 case GLSL_TYPE_ATOMIC_UINT
:
1093 case GLSL_TYPE_SUBROUTINE
:
1094 /* I assume a comparison of a struct containing a sampler just
1095 * ignores the sampler present in the type.
1101 cmp
= new(mem_ctx
) ir_constant(true);
1106 /* For logical operations, we want to ensure that the operands are
1107 * scalar booleans. If it isn't, emit an error and return a constant
1108 * boolean to avoid triggering cascading error messages.
1111 get_scalar_boolean_operand(exec_list
*instructions
,
1112 struct _mesa_glsl_parse_state
*state
,
1113 ast_expression
*parent_expr
,
1115 const char *operand_name
,
1116 bool *error_emitted
)
1118 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1120 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1122 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1125 if (!*error_emitted
) {
1126 YYLTYPE loc
= expr
->get_location();
1127 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1129 parent_expr
->operator_string(parent_expr
->oper
));
1130 *error_emitted
= true;
1133 return new(ctx
) ir_constant(true);
1137 * If name refers to a builtin array whose maximum allowed size is less than
1138 * size, report an error and return true. Otherwise return false.
1141 check_builtin_array_max_size(const char *name
, unsigned size
,
1142 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1144 if ((strcmp("gl_TexCoord", name
) == 0)
1145 && (size
> state
->Const
.MaxTextureCoords
)) {
1146 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1148 * "The size [of gl_TexCoord] can be at most
1149 * gl_MaxTextureCoords."
1151 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1152 "be larger than gl_MaxTextureCoords (%u)",
1153 state
->Const
.MaxTextureCoords
);
1154 } else if (strcmp("gl_ClipDistance", name
) == 0
1155 && size
> state
->Const
.MaxClipPlanes
) {
1156 /* From section 7.1 (Vertex Shader Special Variables) of the
1159 * "The gl_ClipDistance array is predeclared as unsized and
1160 * must be sized by the shader either redeclaring it with a
1161 * size or indexing it only with integral constant
1162 * expressions. ... The size can be at most
1163 * gl_MaxClipDistances."
1165 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1166 "be larger than gl_MaxClipDistances (%u)",
1167 state
->Const
.MaxClipPlanes
);
1172 * Create the constant 1, of a which is appropriate for incrementing and
1173 * decrementing values of the given GLSL type. For example, if type is vec4,
1174 * this creates a constant value of 1.0 having type float.
1176 * If the given type is invalid for increment and decrement operators, return
1177 * a floating point 1--the error will be detected later.
1180 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1182 switch (type
->base_type
) {
1183 case GLSL_TYPE_UINT
:
1184 return new(ctx
) ir_constant((unsigned) 1);
1186 return new(ctx
) ir_constant(1);
1188 case GLSL_TYPE_FLOAT
:
1189 return new(ctx
) ir_constant(1.0f
);
1194 ast_expression::hir(exec_list
*instructions
,
1195 struct _mesa_glsl_parse_state
*state
)
1197 return do_hir(instructions
, state
, true);
1201 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1202 struct _mesa_glsl_parse_state
*state
)
1204 do_hir(instructions
, state
, false);
1208 ast_expression::do_hir(exec_list
*instructions
,
1209 struct _mesa_glsl_parse_state
*state
,
1213 static const int operations
[AST_NUM_OPERATORS
] = {
1214 -1, /* ast_assign doesn't convert to ir_expression. */
1215 -1, /* ast_plus doesn't convert to ir_expression. */
1229 ir_binop_any_nequal
,
1239 /* Note: The following block of expression types actually convert
1240 * to multiple IR instructions.
1242 ir_binop_mul
, /* ast_mul_assign */
1243 ir_binop_div
, /* ast_div_assign */
1244 ir_binop_mod
, /* ast_mod_assign */
1245 ir_binop_add
, /* ast_add_assign */
1246 ir_binop_sub
, /* ast_sub_assign */
1247 ir_binop_lshift
, /* ast_ls_assign */
1248 ir_binop_rshift
, /* ast_rs_assign */
1249 ir_binop_bit_and
, /* ast_and_assign */
1250 ir_binop_bit_xor
, /* ast_xor_assign */
1251 ir_binop_bit_or
, /* ast_or_assign */
1253 -1, /* ast_conditional doesn't convert to ir_expression. */
1254 ir_binop_add
, /* ast_pre_inc. */
1255 ir_binop_sub
, /* ast_pre_dec. */
1256 ir_binop_add
, /* ast_post_inc. */
1257 ir_binop_sub
, /* ast_post_dec. */
1258 -1, /* ast_field_selection doesn't conv to ir_expression. */
1259 -1, /* ast_array_index doesn't convert to ir_expression. */
1260 -1, /* ast_function_call doesn't conv to ir_expression. */
1261 -1, /* ast_identifier doesn't convert to ir_expression. */
1262 -1, /* ast_int_constant doesn't convert to ir_expression. */
1263 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1264 -1, /* ast_float_constant doesn't conv to ir_expression. */
1265 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1266 -1, /* ast_sequence doesn't convert to ir_expression. */
1268 ir_rvalue
*result
= NULL
;
1270 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1271 bool error_emitted
= false;
1274 loc
= this->get_location();
1276 switch (this->oper
) {
1278 assert(!"ast_aggregate: Should never get here.");
1282 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1283 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1286 do_assignment(instructions
, state
,
1287 this->subexpressions
[0]->non_lvalue_description
,
1288 op
[0], op
[1], &result
, needs_rvalue
, false,
1289 this->subexpressions
[0]->get_location());
1294 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1296 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1298 error_emitted
= type
->is_error();
1304 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1306 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1308 error_emitted
= type
->is_error();
1310 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1318 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1319 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1321 type
= arithmetic_result_type(op
[0], op
[1],
1322 (this->oper
== ast_mul
),
1324 error_emitted
= type
->is_error();
1326 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1331 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1332 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1334 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1336 assert(operations
[this->oper
] == ir_binop_mod
);
1338 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1340 error_emitted
= type
->is_error();
1345 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1346 error_emitted
= true;
1349 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1350 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1351 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1353 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1355 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1362 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1363 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1365 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1367 /* The relational operators must either generate an error or result
1368 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1370 assert(type
->is_error()
1371 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1372 && type
->is_scalar()));
1374 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1376 error_emitted
= type
->is_error();
1381 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1382 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1384 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1386 * "The equality operators equal (==), and not equal (!=)
1387 * operate on all types. They result in a scalar Boolean. If
1388 * the operand types do not match, then there must be a
1389 * conversion from Section 4.1.10 "Implicit Conversions"
1390 * applied to one operand that can make them match, in which
1391 * case this conversion is done."
1394 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1395 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1396 "no operation `%1$s' exists that takes a left-hand "
1397 "operand of type 'void' or a right operand of type "
1398 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1399 error_emitted
= true;
1400 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1401 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1402 || (op
[0]->type
!= op
[1]->type
)) {
1403 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1404 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1405 error_emitted
= true;
1406 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1407 !state
->check_version(120, 300, &loc
,
1408 "array comparisons forbidden")) {
1409 error_emitted
= true;
1410 } else if ((op
[0]->type
->contains_opaque() ||
1411 op
[1]->type
->contains_opaque())) {
1412 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1413 error_emitted
= true;
1416 if (error_emitted
) {
1417 result
= new(ctx
) ir_constant(false);
1419 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1420 assert(result
->type
== glsl_type::bool_type
);
1427 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1428 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1429 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1431 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1433 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1437 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1439 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1440 error_emitted
= true;
1443 if (!op
[0]->type
->is_integer()) {
1444 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1445 error_emitted
= true;
1448 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1449 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1452 case ast_logic_and
: {
1453 exec_list rhs_instructions
;
1454 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1455 "LHS", &error_emitted
);
1456 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1457 "RHS", &error_emitted
);
1459 if (rhs_instructions
.is_empty()) {
1460 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1461 type
= result
->type
;
1463 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1466 instructions
->push_tail(tmp
);
1468 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1469 instructions
->push_tail(stmt
);
1471 stmt
->then_instructions
.append_list(&rhs_instructions
);
1472 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1473 ir_assignment
*const then_assign
=
1474 new(ctx
) ir_assignment(then_deref
, op
[1]);
1475 stmt
->then_instructions
.push_tail(then_assign
);
1477 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1478 ir_assignment
*const else_assign
=
1479 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1480 stmt
->else_instructions
.push_tail(else_assign
);
1482 result
= new(ctx
) ir_dereference_variable(tmp
);
1488 case ast_logic_or
: {
1489 exec_list rhs_instructions
;
1490 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1491 "LHS", &error_emitted
);
1492 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1493 "RHS", &error_emitted
);
1495 if (rhs_instructions
.is_empty()) {
1496 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1497 type
= result
->type
;
1499 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1502 instructions
->push_tail(tmp
);
1504 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1505 instructions
->push_tail(stmt
);
1507 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1508 ir_assignment
*const then_assign
=
1509 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1510 stmt
->then_instructions
.push_tail(then_assign
);
1512 stmt
->else_instructions
.append_list(&rhs_instructions
);
1513 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1514 ir_assignment
*const else_assign
=
1515 new(ctx
) ir_assignment(else_deref
, op
[1]);
1516 stmt
->else_instructions
.push_tail(else_assign
);
1518 result
= new(ctx
) ir_dereference_variable(tmp
);
1525 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1527 * "The logical binary operators and (&&), or ( | | ), and
1528 * exclusive or (^^). They operate only on two Boolean
1529 * expressions and result in a Boolean expression."
1531 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1533 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1536 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1541 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1542 "operand", &error_emitted
);
1544 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1548 case ast_mul_assign
:
1549 case ast_div_assign
:
1550 case ast_add_assign
:
1551 case ast_sub_assign
: {
1552 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1553 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1555 type
= arithmetic_result_type(op
[0], op
[1],
1556 (this->oper
== ast_mul_assign
),
1559 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1563 do_assignment(instructions
, state
,
1564 this->subexpressions
[0]->non_lvalue_description
,
1565 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1566 &result
, needs_rvalue
, false,
1567 this->subexpressions
[0]->get_location());
1569 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1570 * explicitly test for this because none of the binary expression
1571 * operators allow array operands either.
1577 case ast_mod_assign
: {
1578 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1579 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1581 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1583 assert(operations
[this->oper
] == ir_binop_mod
);
1585 ir_rvalue
*temp_rhs
;
1586 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1590 do_assignment(instructions
, state
,
1591 this->subexpressions
[0]->non_lvalue_description
,
1592 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1593 &result
, needs_rvalue
, false,
1594 this->subexpressions
[0]->get_location());
1599 case ast_rs_assign
: {
1600 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1601 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1602 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1604 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1605 type
, op
[0], op
[1]);
1607 do_assignment(instructions
, state
,
1608 this->subexpressions
[0]->non_lvalue_description
,
1609 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1610 &result
, needs_rvalue
, false,
1611 this->subexpressions
[0]->get_location());
1615 case ast_and_assign
:
1616 case ast_xor_assign
:
1617 case ast_or_assign
: {
1618 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1619 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1620 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1622 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1623 type
, op
[0], op
[1]);
1625 do_assignment(instructions
, state
,
1626 this->subexpressions
[0]->non_lvalue_description
,
1627 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1628 &result
, needs_rvalue
, false,
1629 this->subexpressions
[0]->get_location());
1633 case ast_conditional
: {
1634 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1636 * "The ternary selection operator (?:). It operates on three
1637 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1638 * first expression, which must result in a scalar Boolean."
1640 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1641 "condition", &error_emitted
);
1643 /* The :? operator is implemented by generating an anonymous temporary
1644 * followed by an if-statement. The last instruction in each branch of
1645 * the if-statement assigns a value to the anonymous temporary. This
1646 * temporary is the r-value of the expression.
1648 exec_list then_instructions
;
1649 exec_list else_instructions
;
1651 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1652 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1654 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1656 * "The second and third expressions can be any type, as
1657 * long their types match, or there is a conversion in
1658 * Section 4.1.10 "Implicit Conversions" that can be applied
1659 * to one of the expressions to make their types match. This
1660 * resulting matching type is the type of the entire
1663 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1664 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1665 || (op
[1]->type
!= op
[2]->type
)) {
1666 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1668 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1669 "operator must have matching types");
1670 error_emitted
= true;
1671 type
= glsl_type::error_type
;
1676 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1678 * "The second and third expressions must be the same type, but can
1679 * be of any type other than an array."
1681 if (type
->is_array() &&
1682 !state
->check_version(120, 300, &loc
,
1683 "second and third operands of ?: operator "
1684 "cannot be arrays")) {
1685 error_emitted
= true;
1688 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1690 * "Except for array indexing, structure member selection, and
1691 * parentheses, opaque variables are not allowed to be operands in
1692 * expressions; such use results in a compile-time error."
1694 if (type
->contains_opaque()) {
1695 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1696 "of the ?: operator");
1697 error_emitted
= true;
1700 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1702 if (then_instructions
.is_empty()
1703 && else_instructions
.is_empty()
1704 && cond_val
!= NULL
) {
1705 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1707 /* The copy to conditional_tmp reads the whole array. */
1708 if (type
->is_array()) {
1709 mark_whole_array_access(op
[1]);
1710 mark_whole_array_access(op
[2]);
1713 ir_variable
*const tmp
=
1714 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1715 instructions
->push_tail(tmp
);
1717 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1718 instructions
->push_tail(stmt
);
1720 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1721 ir_dereference
*const then_deref
=
1722 new(ctx
) ir_dereference_variable(tmp
);
1723 ir_assignment
*const then_assign
=
1724 new(ctx
) ir_assignment(then_deref
, op
[1]);
1725 stmt
->then_instructions
.push_tail(then_assign
);
1727 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1728 ir_dereference
*const else_deref
=
1729 new(ctx
) ir_dereference_variable(tmp
);
1730 ir_assignment
*const else_assign
=
1731 new(ctx
) ir_assignment(else_deref
, op
[2]);
1732 stmt
->else_instructions
.push_tail(else_assign
);
1734 result
= new(ctx
) ir_dereference_variable(tmp
);
1741 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1742 ? "pre-increment operation" : "pre-decrement operation";
1744 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1745 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1747 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1749 ir_rvalue
*temp_rhs
;
1750 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1754 do_assignment(instructions
, state
,
1755 this->subexpressions
[0]->non_lvalue_description
,
1756 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1757 &result
, needs_rvalue
, false,
1758 this->subexpressions
[0]->get_location());
1763 case ast_post_dec
: {
1764 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1765 ? "post-increment operation" : "post-decrement operation";
1766 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1767 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1769 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1771 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1773 ir_rvalue
*temp_rhs
;
1774 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1777 /* Get a temporary of a copy of the lvalue before it's modified.
1778 * This may get thrown away later.
1780 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1782 ir_rvalue
*junk_rvalue
;
1784 do_assignment(instructions
, state
,
1785 this->subexpressions
[0]->non_lvalue_description
,
1786 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1787 &junk_rvalue
, false, false,
1788 this->subexpressions
[0]->get_location());
1793 case ast_field_selection
:
1794 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1797 case ast_array_index
: {
1798 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1800 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1801 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1803 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1806 if (result
->type
->is_error())
1807 error_emitted
= true;
1812 case ast_unsized_array_dim
:
1813 assert(!"ast_unsized_array_dim: Should never get here.");
1816 case ast_function_call
:
1817 /* Should *NEVER* get here. ast_function_call should always be handled
1818 * by ast_function_expression::hir.
1823 case ast_identifier
: {
1824 /* ast_identifier can appear several places in a full abstract syntax
1825 * tree. This particular use must be at location specified in the grammar
1826 * as 'variable_identifier'.
1829 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1832 var
->data
.used
= true;
1833 result
= new(ctx
) ir_dereference_variable(var
);
1835 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1836 this->primary_expression
.identifier
);
1838 result
= ir_rvalue::error_value(ctx
);
1839 error_emitted
= true;
1844 case ast_int_constant
:
1845 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1848 case ast_uint_constant
:
1849 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1852 case ast_float_constant
:
1853 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1856 case ast_bool_constant
:
1857 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1860 case ast_double_constant
:
1861 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1864 case ast_sequence
: {
1865 /* It should not be possible to generate a sequence in the AST without
1866 * any expressions in it.
1868 assert(!this->expressions
.is_empty());
1870 /* The r-value of a sequence is the last expression in the sequence. If
1871 * the other expressions in the sequence do not have side-effects (and
1872 * therefore add instructions to the instruction list), they get dropped
1875 exec_node
*previous_tail_pred
= NULL
;
1876 YYLTYPE previous_operand_loc
= loc
;
1878 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1879 /* If one of the operands of comma operator does not generate any
1880 * code, we want to emit a warning. At each pass through the loop
1881 * previous_tail_pred will point to the last instruction in the
1882 * stream *before* processing the previous operand. Naturally,
1883 * instructions->tail_pred will point to the last instruction in the
1884 * stream *after* processing the previous operand. If the two
1885 * pointers match, then the previous operand had no effect.
1887 * The warning behavior here differs slightly from GCC. GCC will
1888 * only emit a warning if none of the left-hand operands have an
1889 * effect. However, it will emit a warning for each. I believe that
1890 * there are some cases in C (especially with GCC extensions) where
1891 * it is useful to have an intermediate step in a sequence have no
1892 * effect, but I don't think these cases exist in GLSL. Either way,
1893 * it would be a giant hassle to replicate that behavior.
1895 if (previous_tail_pred
== instructions
->tail_pred
) {
1896 _mesa_glsl_warning(&previous_operand_loc
, state
,
1897 "left-hand operand of comma expression has "
1901 /* tail_pred is directly accessed instead of using the get_tail()
1902 * method for performance reasons. get_tail() has extra code to
1903 * return NULL when the list is empty. We don't care about that
1904 * here, so using tail_pred directly is fine.
1906 previous_tail_pred
= instructions
->tail_pred
;
1907 previous_operand_loc
= ast
->get_location();
1909 result
= ast
->hir(instructions
, state
);
1912 /* Any errors should have already been emitted in the loop above.
1914 error_emitted
= true;
1918 type
= NULL
; /* use result->type, not type. */
1919 assert(result
!= NULL
|| !needs_rvalue
);
1921 if (result
&& result
->type
->is_error() && !error_emitted
)
1922 _mesa_glsl_error(& loc
, state
, "type mismatch");
1928 ast_expression::has_sequence_subexpression() const
1930 switch (this->oper
) {
1939 return this->subexpressions
[0]->has_sequence_subexpression();
1961 case ast_array_index
:
1962 case ast_mul_assign
:
1963 case ast_div_assign
:
1964 case ast_add_assign
:
1965 case ast_sub_assign
:
1966 case ast_mod_assign
:
1969 case ast_and_assign
:
1970 case ast_xor_assign
:
1972 return this->subexpressions
[0]->has_sequence_subexpression() ||
1973 this->subexpressions
[1]->has_sequence_subexpression();
1975 case ast_conditional
:
1976 return this->subexpressions
[0]->has_sequence_subexpression() ||
1977 this->subexpressions
[1]->has_sequence_subexpression() ||
1978 this->subexpressions
[2]->has_sequence_subexpression();
1983 case ast_field_selection
:
1984 case ast_identifier
:
1985 case ast_int_constant
:
1986 case ast_uint_constant
:
1987 case ast_float_constant
:
1988 case ast_bool_constant
:
1989 case ast_double_constant
:
1993 unreachable("ast_aggregate: Should never get here.");
1995 case ast_function_call
:
1996 unreachable("should be handled by ast_function_expression::hir");
1998 case ast_unsized_array_dim
:
1999 unreachable("ast_unsized_array_dim: Should never get here.");
2006 ast_expression_statement::hir(exec_list
*instructions
,
2007 struct _mesa_glsl_parse_state
*state
)
2009 /* It is possible to have expression statements that don't have an
2010 * expression. This is the solitary semicolon:
2012 * for (i = 0; i < 5; i++)
2015 * In this case the expression will be NULL. Test for NULL and don't do
2016 * anything in that case.
2018 if (expression
!= NULL
)
2019 expression
->hir_no_rvalue(instructions
, state
);
2021 /* Statements do not have r-values.
2028 ast_compound_statement::hir(exec_list
*instructions
,
2029 struct _mesa_glsl_parse_state
*state
)
2032 state
->symbols
->push_scope();
2034 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2035 ast
->hir(instructions
, state
);
2038 state
->symbols
->pop_scope();
2040 /* Compound statements do not have r-values.
2046 * Evaluate the given exec_node (which should be an ast_node representing
2047 * a single array dimension) and return its integer value.
2050 process_array_size(exec_node
*node
,
2051 struct _mesa_glsl_parse_state
*state
)
2053 exec_list dummy_instructions
;
2055 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2058 * Dimensions other than the outermost dimension can by unsized if they
2059 * are immediately sized by a constructor or initializer.
2061 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2064 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2065 YYLTYPE loc
= array_size
->get_location();
2068 _mesa_glsl_error(& loc
, state
,
2069 "array size could not be resolved");
2073 if (!ir
->type
->is_integer()) {
2074 _mesa_glsl_error(& loc
, state
,
2075 "array size must be integer type");
2079 if (!ir
->type
->is_scalar()) {
2080 _mesa_glsl_error(& loc
, state
,
2081 "array size must be scalar type");
2085 ir_constant
*const size
= ir
->constant_expression_value();
2086 if (size
== NULL
|| array_size
->has_sequence_subexpression()) {
2087 _mesa_glsl_error(& loc
, state
, "array size must be a "
2088 "constant valued expression");
2092 if (size
->value
.i
[0] <= 0) {
2093 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2097 assert(size
->type
== ir
->type
);
2099 /* If the array size is const (and we've verified that
2100 * it is) then no instructions should have been emitted
2101 * when we converted it to HIR. If they were emitted,
2102 * then either the array size isn't const after all, or
2103 * we are emitting unnecessary instructions.
2105 assert(dummy_instructions
.is_empty());
2107 return size
->value
.u
[0];
2110 static const glsl_type
*
2111 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2112 ast_array_specifier
*array_specifier
,
2113 struct _mesa_glsl_parse_state
*state
)
2115 const glsl_type
*array_type
= base
;
2117 if (array_specifier
!= NULL
) {
2118 if (base
->is_array()) {
2120 /* From page 19 (page 25) of the GLSL 1.20 spec:
2122 * "Only one-dimensional arrays may be declared."
2124 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2125 return glsl_type::error_type
;
2129 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2130 !node
->is_head_sentinel(); node
= node
->prev
) {
2131 unsigned array_size
= process_array_size(node
, state
);
2132 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2140 precision_qualifier_allowed(const glsl_type
*type
)
2142 /* Precision qualifiers apply to floating point, integer and opaque
2145 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2146 * "Any floating point or any integer declaration can have the type
2147 * preceded by one of these precision qualifiers [...] Literal
2148 * constants do not have precision qualifiers. Neither do Boolean
2151 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2154 * "Precision qualifiers are added for code portability with OpenGL
2155 * ES, not for functionality. They have the same syntax as in OpenGL
2158 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2160 * "uniform lowp sampler2D sampler;
2163 * lowp vec4 col = texture2D (sampler, coord);
2164 * // texture2D returns lowp"
2166 * From this, we infer that GLSL 1.30 (and later) should allow precision
2167 * qualifiers on sampler types just like float and integer types.
2169 return (type
->is_float()
2170 || type
->is_integer()
2171 || type
->contains_opaque())
2172 && !type
->without_array()->is_record();
2176 ast_type_specifier::glsl_type(const char **name
,
2177 struct _mesa_glsl_parse_state
*state
) const
2179 const struct glsl_type
*type
;
2181 type
= state
->symbols
->get_type(this->type_name
);
2182 *name
= this->type_name
;
2184 YYLTYPE loc
= this->get_location();
2185 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2191 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2193 * "The precision statement
2195 * precision precision-qualifier type;
2197 * can be used to establish a default precision qualifier. The type field can
2198 * be either int or float or any of the sampler types, (...) If type is float,
2199 * the directive applies to non-precision-qualified floating point type
2200 * (scalar, vector, and matrix) declarations. If type is int, the directive
2201 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2202 * and unsigned) declarations."
2204 * We use the symbol table to keep the values of the default precisions for
2205 * each 'type' in each scope and we use the 'type' string from the precision
2206 * statement as key in the symbol table. When we want to retrieve the default
2207 * precision associated with a given glsl_type we need to know the type string
2208 * associated with it. This is what this function returns.
2211 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2213 switch (type
->base_type
) {
2214 case GLSL_TYPE_FLOAT
:
2216 case GLSL_TYPE_UINT
:
2219 case GLSL_TYPE_ATOMIC_UINT
:
2220 return "atomic_uint";
2221 case GLSL_TYPE_IMAGE
:
2223 case GLSL_TYPE_SAMPLER
: {
2224 const unsigned type_idx
=
2225 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2226 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2227 assert(type_idx
< 4);
2228 switch (type
->sampler_type
) {
2229 case GLSL_TYPE_FLOAT
:
2230 switch (type
->sampler_dimensionality
) {
2231 case GLSL_SAMPLER_DIM_1D
: {
2232 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2233 static const char *const names
[4] = {
2234 "sampler1D", "sampler1DArray",
2235 "sampler1DShadow", "sampler1DArrayShadow"
2237 return names
[type_idx
];
2239 case GLSL_SAMPLER_DIM_2D
: {
2240 static const char *const names
[8] = {
2241 "sampler2D", "sampler2DArray",
2242 "sampler2DShadow", "sampler2DArrayShadow",
2243 "image2D", "image2DArray", NULL
, NULL
2245 return names
[offset
+ type_idx
];
2247 case GLSL_SAMPLER_DIM_3D
: {
2248 static const char *const names
[8] = {
2249 "sampler3D", NULL
, NULL
, NULL
,
2250 "image3D", NULL
, NULL
, NULL
2252 return names
[offset
+ type_idx
];
2254 case GLSL_SAMPLER_DIM_CUBE
: {
2255 static const char *const names
[8] = {
2256 "samplerCube", "samplerCubeArray",
2257 "samplerCubeShadow", "samplerCubeArrayShadow",
2258 "imageCube", NULL
, NULL
, NULL
2260 return names
[offset
+ type_idx
];
2262 case GLSL_SAMPLER_DIM_MS
: {
2263 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2264 static const char *const names
[4] = {
2265 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2267 return names
[type_idx
];
2269 case GLSL_SAMPLER_DIM_RECT
: {
2270 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2271 static const char *const names
[4] = {
2272 "samplerRect", NULL
, "samplerRectShadow", NULL
2274 return names
[type_idx
];
2276 case GLSL_SAMPLER_DIM_BUF
: {
2277 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2278 static const char *const names
[4] = {
2279 "samplerBuffer", NULL
, NULL
, NULL
2281 return names
[type_idx
];
2283 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2284 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2285 static const char *const names
[4] = {
2286 "samplerExternalOES", NULL
, NULL
, NULL
2288 return names
[type_idx
];
2291 unreachable("Unsupported sampler/image dimensionality");
2292 } /* sampler/image float dimensionality */
2295 switch (type
->sampler_dimensionality
) {
2296 case GLSL_SAMPLER_DIM_1D
: {
2297 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2298 static const char *const names
[4] = {
2299 "isampler1D", "isampler1DArray", NULL
, NULL
2301 return names
[type_idx
];
2303 case GLSL_SAMPLER_DIM_2D
: {
2304 static const char *const names
[8] = {
2305 "isampler2D", "isampler2DArray", NULL
, NULL
,
2306 "iimage2D", "iimage2DArray", NULL
, NULL
2308 return names
[offset
+ type_idx
];
2310 case GLSL_SAMPLER_DIM_3D
: {
2311 static const char *const names
[8] = {
2312 "isampler3D", NULL
, NULL
, NULL
,
2313 "iimage3D", NULL
, NULL
, NULL
2315 return names
[offset
+ type_idx
];
2317 case GLSL_SAMPLER_DIM_CUBE
: {
2318 static const char *const names
[8] = {
2319 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2320 "iimageCube", NULL
, NULL
, NULL
2322 return names
[offset
+ type_idx
];
2324 case GLSL_SAMPLER_DIM_MS
: {
2325 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2326 static const char *const names
[4] = {
2327 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2329 return names
[type_idx
];
2331 case GLSL_SAMPLER_DIM_RECT
: {
2332 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2333 static const char *const names
[4] = {
2334 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2336 return names
[type_idx
];
2338 case GLSL_SAMPLER_DIM_BUF
: {
2339 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2340 static const char *const names
[4] = {
2341 "isamplerBuffer", NULL
, NULL
, NULL
2343 return names
[type_idx
];
2346 unreachable("Unsupported isampler/iimage dimensionality");
2347 } /* sampler/image int dimensionality */
2349 case GLSL_TYPE_UINT
:
2350 switch (type
->sampler_dimensionality
) {
2351 case GLSL_SAMPLER_DIM_1D
: {
2352 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2353 static const char *const names
[4] = {
2354 "usampler1D", "usampler1DArray", NULL
, NULL
2356 return names
[type_idx
];
2358 case GLSL_SAMPLER_DIM_2D
: {
2359 static const char *const names
[8] = {
2360 "usampler2D", "usampler2DArray", NULL
, NULL
,
2361 "uimage2D", "uimage2DArray", NULL
, NULL
2363 return names
[offset
+ type_idx
];
2365 case GLSL_SAMPLER_DIM_3D
: {
2366 static const char *const names
[8] = {
2367 "usampler3D", NULL
, NULL
, NULL
,
2368 "uimage3D", NULL
, NULL
, NULL
2370 return names
[offset
+ type_idx
];
2372 case GLSL_SAMPLER_DIM_CUBE
: {
2373 static const char *const names
[8] = {
2374 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2375 "uimageCube", NULL
, NULL
, NULL
2377 return names
[offset
+ type_idx
];
2379 case GLSL_SAMPLER_DIM_MS
: {
2380 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2381 static const char *const names
[4] = {
2382 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2384 return names
[type_idx
];
2386 case GLSL_SAMPLER_DIM_RECT
: {
2387 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2388 static const char *const names
[4] = {
2389 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2391 return names
[type_idx
];
2393 case GLSL_SAMPLER_DIM_BUF
: {
2394 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2395 static const char *const names
[4] = {
2396 "usamplerBuffer", NULL
, NULL
, NULL
2398 return names
[type_idx
];
2401 unreachable("Unsupported usampler/uimage dimensionality");
2402 } /* sampler/image uint dimensionality */
2405 unreachable("Unsupported sampler/image type");
2406 } /* sampler/image type */
2408 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2411 unreachable("Unsupported type");
2416 select_gles_precision(unsigned qual_precision
,
2417 const glsl_type
*type
,
2418 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2420 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2421 * In GLES we take the precision from the type qualifier if present,
2422 * otherwise, if the type of the variable allows precision qualifiers at
2423 * all, we look for the default precision qualifier for that type in the
2426 assert(state
->es_shader
);
2428 unsigned precision
= GLSL_PRECISION_NONE
;
2429 if (qual_precision
) {
2430 precision
= qual_precision
;
2431 } else if (precision_qualifier_allowed(type
)) {
2432 const char *type_name
=
2433 get_type_name_for_precision_qualifier(type
->without_array());
2434 assert(type_name
!= NULL
);
2437 state
->symbols
->get_default_precision_qualifier(type_name
);
2438 if (precision
== ast_precision_none
) {
2439 _mesa_glsl_error(loc
, state
,
2440 "No precision specified in this scope for type `%s'",
2448 ast_fully_specified_type::glsl_type(const char **name
,
2449 struct _mesa_glsl_parse_state
*state
) const
2451 return this->specifier
->glsl_type(name
, state
);
2455 * Determine whether a toplevel variable declaration declares a varying. This
2456 * function operates by examining the variable's mode and the shader target,
2457 * so it correctly identifies linkage variables regardless of whether they are
2458 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2460 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2461 * this function will produce undefined results.
2464 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2467 case MESA_SHADER_VERTEX
:
2468 return var
->data
.mode
== ir_var_shader_out
;
2469 case MESA_SHADER_FRAGMENT
:
2470 return var
->data
.mode
== ir_var_shader_in
;
2472 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2478 * Matrix layout qualifiers are only allowed on certain types
2481 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2483 const glsl_type
*type
,
2486 if (var
&& !var
->is_in_buffer_block()) {
2487 /* Layout qualifiers may only apply to interface blocks and fields in
2490 _mesa_glsl_error(loc
, state
,
2491 "uniform block layout qualifiers row_major and "
2492 "column_major may not be applied to variables "
2493 "outside of uniform blocks");
2494 } else if (!type
->without_array()->is_matrix()) {
2495 /* The OpenGL ES 3.0 conformance tests did not originally allow
2496 * matrix layout qualifiers on non-matrices. However, the OpenGL
2497 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2498 * amended to specifically allow these layouts on all types. Emit
2499 * a warning so that people know their code may not be portable.
2501 _mesa_glsl_warning(loc
, state
,
2502 "uniform block layout qualifiers row_major and "
2503 "column_major applied to non-matrix types may "
2504 "be rejected by older compilers");
2509 process_qualifier_constant(struct _mesa_glsl_parse_state
*state
,
2511 const char *qual_indentifier
,
2512 ast_expression
*const_expression
,
2515 exec_list dummy_instructions
;
2517 if (const_expression
== NULL
) {
2522 ir_rvalue
*const ir
= const_expression
->hir(&dummy_instructions
, state
);
2524 ir_constant
*const const_int
= ir
->constant_expression_value();
2525 if (const_int
== NULL
|| !const_int
->type
->is_integer()) {
2526 _mesa_glsl_error(loc
, state
, "%s must be an integral constant "
2527 "expression", qual_indentifier
);
2531 if (const_int
->value
.i
[0] < 0) {
2532 _mesa_glsl_error(loc
, state
, "%s layout qualifier is invalid (%d < 0)",
2533 qual_indentifier
, const_int
->value
.u
[0]);
2537 /* If the location is const (and we've verified that
2538 * it is) then no instructions should have been emitted
2539 * when we converted it to HIR. If they were emitted,
2540 * then either the location isn't const after all, or
2541 * we are emitting unnecessary instructions.
2543 assert(dummy_instructions
.is_empty());
2545 *value
= const_int
->value
.u
[0];
2550 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2553 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2554 _mesa_glsl_error(loc
, state
,
2555 "invalid stream specified %d is larger than "
2556 "MAX_VERTEX_STREAMS - 1 (%d).",
2557 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2565 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2568 const glsl_type
*type
,
2569 const ast_type_qualifier
*qual
)
2571 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2572 _mesa_glsl_error(loc
, state
,
2573 "the \"binding\" qualifier only applies to uniforms and "
2574 "shader storage buffer objects");
2578 unsigned qual_binding
;
2579 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2584 const struct gl_context
*const ctx
= state
->ctx
;
2585 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2586 unsigned max_index
= qual_binding
+ elements
- 1;
2587 const glsl_type
*base_type
= type
->without_array();
2589 if (base_type
->is_interface()) {
2590 /* UBOs. From page 60 of the GLSL 4.20 specification:
2591 * "If the binding point for any uniform block instance is less than zero,
2592 * or greater than or equal to the implementation-dependent maximum
2593 * number of uniform buffer bindings, a compilation error will occur.
2594 * When the binding identifier is used with a uniform block instanced as
2595 * an array of size N, all elements of the array from binding through
2596 * binding + N – 1 must be within this range."
2598 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2600 if (qual
->flags
.q
.uniform
&&
2601 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2602 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2603 "the maximum number of UBO binding points (%d)",
2604 qual_binding
, elements
,
2605 ctx
->Const
.MaxUniformBufferBindings
);
2609 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2610 * "If the binding point for any uniform or shader storage block instance
2611 * is less than zero, or greater than or equal to the
2612 * implementation-dependent maximum number of uniform buffer bindings, a
2613 * compile-time error will occur. When the binding identifier is used
2614 * with a uniform or shader storage block instanced as an array of size
2615 * N, all elements of the array from binding through binding + N – 1 must
2616 * be within this range."
2618 if (qual
->flags
.q
.buffer
&&
2619 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2620 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2621 "the maximum number of SSBO binding points (%d)",
2622 qual_binding
, elements
,
2623 ctx
->Const
.MaxShaderStorageBufferBindings
);
2626 } else if (base_type
->is_sampler()) {
2627 /* Samplers. From page 63 of the GLSL 4.20 specification:
2628 * "If the binding is less than zero, or greater than or equal to the
2629 * implementation-dependent maximum supported number of units, a
2630 * compilation error will occur. When the binding identifier is used
2631 * with an array of size N, all elements of the array from binding
2632 * through binding + N - 1 must be within this range."
2634 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2636 if (max_index
>= limit
) {
2637 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2638 "exceeds the maximum number of texture image units "
2639 "(%u)", qual_binding
, elements
, limit
);
2643 } else if (base_type
->contains_atomic()) {
2644 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2645 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2646 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2647 " maximum number of atomic counter buffer bindings"
2648 "(%u)", qual_binding
,
2649 ctx
->Const
.MaxAtomicBufferBindings
);
2653 } else if ((state
->is_version(420, 310) ||
2654 state
->ARB_shading_language_420pack_enable
) &&
2655 base_type
->is_image()) {
2656 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2657 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2658 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2659 " maximum number of image units (%d)", max_index
,
2660 ctx
->Const
.MaxImageUnits
);
2665 _mesa_glsl_error(loc
, state
,
2666 "the \"binding\" qualifier only applies to uniform "
2667 "blocks, opaque variables, or arrays thereof");
2671 var
->data
.explicit_binding
= true;
2672 var
->data
.binding
= qual_binding
;
2678 static glsl_interp_qualifier
2679 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2680 ir_variable_mode mode
,
2681 struct _mesa_glsl_parse_state
*state
,
2684 glsl_interp_qualifier interpolation
;
2685 if (qual
->flags
.q
.flat
)
2686 interpolation
= INTERP_QUALIFIER_FLAT
;
2687 else if (qual
->flags
.q
.noperspective
)
2688 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2689 else if (qual
->flags
.q
.smooth
)
2690 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2692 interpolation
= INTERP_QUALIFIER_NONE
;
2694 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2695 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2696 _mesa_glsl_error(loc
, state
,
2697 "interpolation qualifier `%s' can only be applied to "
2698 "shader inputs or outputs.",
2699 interpolation_string(interpolation
));
2703 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2704 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2705 _mesa_glsl_error(loc
, state
,
2706 "interpolation qualifier `%s' cannot be applied to "
2707 "vertex shader inputs or fragment shader outputs",
2708 interpolation_string(interpolation
));
2712 return interpolation
;
2717 apply_explicit_location(const struct ast_type_qualifier
*qual
,
2719 struct _mesa_glsl_parse_state
*state
,
2724 unsigned qual_location
;
2725 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
2730 /* Checks for GL_ARB_explicit_uniform_location. */
2731 if (qual
->flags
.q
.uniform
) {
2732 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2735 const struct gl_context
*const ctx
= state
->ctx
;
2736 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
2738 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2739 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2740 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2741 ctx
->Const
.MaxUserAssignableUniformLocations
);
2745 var
->data
.explicit_location
= true;
2746 var
->data
.location
= qual_location
;
2750 /* Between GL_ARB_explicit_attrib_location an
2751 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2752 * stage can be assigned explicit locations. The checking here associates
2753 * the correct extension with the correct stage's input / output:
2757 * vertex explicit_loc sso
2758 * tess control sso sso
2761 * fragment sso explicit_loc
2763 switch (state
->stage
) {
2764 case MESA_SHADER_VERTEX
:
2765 if (var
->data
.mode
== ir_var_shader_in
) {
2766 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2772 if (var
->data
.mode
== ir_var_shader_out
) {
2773 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2782 case MESA_SHADER_TESS_CTRL
:
2783 case MESA_SHADER_TESS_EVAL
:
2784 case MESA_SHADER_GEOMETRY
:
2785 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2786 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2795 case MESA_SHADER_FRAGMENT
:
2796 if (var
->data
.mode
== ir_var_shader_in
) {
2797 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2803 if (var
->data
.mode
== ir_var_shader_out
) {
2804 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2813 case MESA_SHADER_COMPUTE
:
2814 _mesa_glsl_error(loc
, state
,
2815 "compute shader variables cannot be given "
2816 "explicit locations");
2821 _mesa_glsl_error(loc
, state
,
2822 "%s cannot be given an explicit location in %s shader",
2824 _mesa_shader_stage_to_string(state
->stage
));
2826 var
->data
.explicit_location
= true;
2828 switch (state
->stage
) {
2829 case MESA_SHADER_VERTEX
:
2830 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2831 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
2832 : (qual_location
+ VARYING_SLOT_VAR0
);
2835 case MESA_SHADER_TESS_CTRL
:
2836 case MESA_SHADER_TESS_EVAL
:
2837 case MESA_SHADER_GEOMETRY
:
2838 if (var
->data
.patch
)
2839 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
2841 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
2844 case MESA_SHADER_FRAGMENT
:
2845 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2846 ? (qual_location
+ FRAG_RESULT_DATA0
)
2847 : (qual_location
+ VARYING_SLOT_VAR0
);
2849 case MESA_SHADER_COMPUTE
:
2850 assert(!"Unexpected shader type");
2854 /* Check if index was set for the uniform instead of the function */
2855 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
2856 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
2857 "used with subroutine functions");
2861 unsigned qual_index
;
2862 if (qual
->flags
.q
.explicit_index
&&
2863 process_qualifier_constant(state
, loc
, "index", qual
->index
,
2865 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2866 * Layout Qualifiers):
2868 * "It is also a compile-time error if a fragment shader
2869 * sets a layout index to less than 0 or greater than 1."
2871 * Older specifications don't mandate a behavior; we take
2872 * this as a clarification and always generate the error.
2874 if (qual_index
> 1) {
2875 _mesa_glsl_error(loc
, state
,
2876 "explicit index may only be 0 or 1");
2878 var
->data
.explicit_index
= true;
2879 var
->data
.index
= qual_index
;
2886 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2888 struct _mesa_glsl_parse_state
*state
,
2891 const glsl_type
*base_type
= var
->type
->without_array();
2893 if (base_type
->is_image()) {
2894 if (var
->data
.mode
!= ir_var_uniform
&&
2895 var
->data
.mode
!= ir_var_function_in
) {
2896 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2897 "function parameters or uniform-qualified "
2898 "global variables");
2901 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2902 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2903 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2904 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2905 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2906 var
->data
.read_only
= true;
2908 if (qual
->flags
.q
.explicit_image_format
) {
2909 if (var
->data
.mode
== ir_var_function_in
) {
2910 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2911 "used on image function parameters");
2914 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2915 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2916 "base data type of the image");
2919 var
->data
.image_format
= qual
->image_format
;
2921 if (var
->data
.mode
== ir_var_uniform
) {
2922 if (state
->es_shader
) {
2923 _mesa_glsl_error(loc
, state
, "all image uniforms "
2924 "must have a format layout qualifier");
2926 } else if (!qual
->flags
.q
.write_only
) {
2927 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
2928 "`writeonly' must have a format layout "
2933 var
->data
.image_format
= GL_NONE
;
2936 /* From page 70 of the GLSL ES 3.1 specification:
2938 * "Except for image variables qualified with the format qualifiers
2939 * r32f, r32i, and r32ui, image variables must specify either memory
2940 * qualifier readonly or the memory qualifier writeonly."
2942 if (state
->es_shader
&&
2943 var
->data
.image_format
!= GL_R32F
&&
2944 var
->data
.image_format
!= GL_R32I
&&
2945 var
->data
.image_format
!= GL_R32UI
&&
2946 !var
->data
.image_read_only
&&
2947 !var
->data
.image_write_only
) {
2948 _mesa_glsl_error(loc
, state
, "image variables of format other than "
2949 "r32f, r32i or r32ui must be qualified `readonly' or "
2953 } else if (qual
->flags
.q
.read_only
||
2954 qual
->flags
.q
.write_only
||
2955 qual
->flags
.q
.coherent
||
2956 qual
->flags
.q
._volatile
||
2957 qual
->flags
.q
.restrict_flag
||
2958 qual
->flags
.q
.explicit_image_format
) {
2959 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
2964 static inline const char*
2965 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
2967 if (origin_upper_left
&& pixel_center_integer
)
2968 return "origin_upper_left, pixel_center_integer";
2969 else if (origin_upper_left
)
2970 return "origin_upper_left";
2971 else if (pixel_center_integer
)
2972 return "pixel_center_integer";
2978 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
2979 const struct ast_type_qualifier
*qual
)
2981 /* If gl_FragCoord was previously declared, and the qualifiers were
2982 * different in any way, return true.
2984 if (state
->fs_redeclares_gl_fragcoord
) {
2985 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
2986 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
2993 validate_array_dimensions(const glsl_type
*t
,
2994 struct _mesa_glsl_parse_state
*state
,
2996 if (t
->is_array()) {
2997 t
= t
->fields
.array
;
2998 while (t
->is_array()) {
2999 if (t
->is_unsized_array()) {
3000 _mesa_glsl_error(loc
, state
,
3001 "only the outermost array dimension can "
3006 t
= t
->fields
.array
;
3012 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3014 struct _mesa_glsl_parse_state
*state
,
3017 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3019 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3021 * "Within any shader, the first redeclarations of gl_FragCoord
3022 * must appear before any use of gl_FragCoord."
3024 * Generate a compiler error if above condition is not met by the
3027 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3028 if (earlier
!= NULL
&&
3029 earlier
->data
.used
&&
3030 !state
->fs_redeclares_gl_fragcoord
) {
3031 _mesa_glsl_error(loc
, state
,
3032 "gl_FragCoord used before its first redeclaration "
3033 "in fragment shader");
3036 /* Make sure all gl_FragCoord redeclarations specify the same layout
3039 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3040 const char *const qual_string
=
3041 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3042 qual
->flags
.q
.pixel_center_integer
);
3044 const char *const state_string
=
3045 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3046 state
->fs_pixel_center_integer
);
3048 _mesa_glsl_error(loc
, state
,
3049 "gl_FragCoord redeclared with different layout "
3050 "qualifiers (%s) and (%s) ",
3054 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3055 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3056 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3057 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3058 state
->fs_redeclares_gl_fragcoord
=
3059 state
->fs_origin_upper_left
||
3060 state
->fs_pixel_center_integer
||
3061 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3064 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3065 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3066 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3067 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3068 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3069 ? "origin_upper_left" : "pixel_center_integer";
3071 _mesa_glsl_error(loc
, state
,
3072 "layout qualifier `%s' can only be applied to "
3073 "fragment shader input `gl_FragCoord'",
3077 if (qual
->flags
.q
.explicit_location
) {
3078 apply_explicit_location(qual
, var
, state
, loc
);
3079 } else if (qual
->flags
.q
.explicit_index
) {
3080 if (!qual
->flags
.q
.subroutine_def
)
3081 _mesa_glsl_error(loc
, state
,
3082 "explicit index requires explicit location");
3085 if (qual
->flags
.q
.explicit_binding
) {
3086 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3089 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3090 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3091 unsigned qual_stream
;
3092 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3094 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3095 var
->data
.stream
= qual_stream
;
3099 if (var
->type
->contains_atomic()) {
3100 if (var
->data
.mode
== ir_var_uniform
) {
3101 if (var
->data
.explicit_binding
) {
3103 &state
->atomic_counter_offsets
[var
->data
.binding
];
3105 if (*offset
% ATOMIC_COUNTER_SIZE
)
3106 _mesa_glsl_error(loc
, state
,
3107 "misaligned atomic counter offset");
3109 var
->data
.atomic
.offset
= *offset
;
3110 *offset
+= var
->type
->atomic_size();
3113 _mesa_glsl_error(loc
, state
,
3114 "atomic counters require explicit binding point");
3116 } else if (var
->data
.mode
!= ir_var_function_in
) {
3117 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3118 "function parameters or uniform-qualified "
3119 "global variables");
3123 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3124 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3125 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3126 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3127 * These extensions and all following extensions that add the 'layout'
3128 * keyword have been modified to require the use of 'in' or 'out'.
3130 * The following extension do not allow the deprecated keywords:
3132 * GL_AMD_conservative_depth
3133 * GL_ARB_conservative_depth
3134 * GL_ARB_gpu_shader5
3135 * GL_ARB_separate_shader_objects
3136 * GL_ARB_tessellation_shader
3137 * GL_ARB_transform_feedback3
3138 * GL_ARB_uniform_buffer_object
3140 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3141 * allow layout with the deprecated keywords.
3143 const bool relaxed_layout_qualifier_checking
=
3144 state
->ARB_fragment_coord_conventions_enable
;
3146 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3147 || qual
->flags
.q
.varying
;
3148 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3149 if (relaxed_layout_qualifier_checking
) {
3150 _mesa_glsl_warning(loc
, state
,
3151 "`layout' qualifier may not be used with "
3152 "`attribute' or `varying'");
3154 _mesa_glsl_error(loc
, state
,
3155 "`layout' qualifier may not be used with "
3156 "`attribute' or `varying'");
3160 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3161 * AMD_conservative_depth.
3163 int depth_layout_count
= qual
->flags
.q
.depth_any
3164 + qual
->flags
.q
.depth_greater
3165 + qual
->flags
.q
.depth_less
3166 + qual
->flags
.q
.depth_unchanged
;
3167 if (depth_layout_count
> 0
3168 && !state
->AMD_conservative_depth_enable
3169 && !state
->ARB_conservative_depth_enable
) {
3170 _mesa_glsl_error(loc
, state
,
3171 "extension GL_AMD_conservative_depth or "
3172 "GL_ARB_conservative_depth must be enabled "
3173 "to use depth layout qualifiers");
3174 } else if (depth_layout_count
> 0
3175 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3176 _mesa_glsl_error(loc
, state
,
3177 "depth layout qualifiers can be applied only to "
3179 } else if (depth_layout_count
> 1
3180 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3181 _mesa_glsl_error(loc
, state
,
3182 "at most one depth layout qualifier can be applied to "
3185 if (qual
->flags
.q
.depth_any
)
3186 var
->data
.depth_layout
= ir_depth_layout_any
;
3187 else if (qual
->flags
.q
.depth_greater
)
3188 var
->data
.depth_layout
= ir_depth_layout_greater
;
3189 else if (qual
->flags
.q
.depth_less
)
3190 var
->data
.depth_layout
= ir_depth_layout_less
;
3191 else if (qual
->flags
.q
.depth_unchanged
)
3192 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3194 var
->data
.depth_layout
= ir_depth_layout_none
;
3196 if (qual
->flags
.q
.std140
||
3197 qual
->flags
.q
.std430
||
3198 qual
->flags
.q
.packed
||
3199 qual
->flags
.q
.shared
) {
3200 _mesa_glsl_error(loc
, state
,
3201 "uniform and shader storage block layout qualifiers "
3202 "std140, std430, packed, and shared can only be "
3203 "applied to uniform or shader storage blocks, not "
3207 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3208 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3211 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3214 * "Fragment shaders also allow the following layout qualifier on in only
3215 * (not with variable declarations)
3216 * layout-qualifier-id
3217 * early_fragment_tests
3220 if (qual
->flags
.q
.early_fragment_tests
) {
3221 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3222 "valid in fragment shader input layout declaration.");
3227 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3229 struct _mesa_glsl_parse_state
*state
,
3233 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3235 if (qual
->flags
.q
.invariant
) {
3236 if (var
->data
.used
) {
3237 _mesa_glsl_error(loc
, state
,
3238 "variable `%s' may not be redeclared "
3239 "`invariant' after being used",
3242 var
->data
.invariant
= 1;
3246 if (qual
->flags
.q
.precise
) {
3247 if (var
->data
.used
) {
3248 _mesa_glsl_error(loc
, state
,
3249 "variable `%s' may not be redeclared "
3250 "`precise' after being used",
3253 var
->data
.precise
= 1;
3257 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3258 _mesa_glsl_error(loc
, state
,
3259 "`subroutine' may only be applied to uniforms, "
3260 "subroutine type declarations, or function definitions");
3263 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3264 || qual
->flags
.q
.uniform
3265 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3266 var
->data
.read_only
= 1;
3268 if (qual
->flags
.q
.centroid
)
3269 var
->data
.centroid
= 1;
3271 if (qual
->flags
.q
.sample
)
3272 var
->data
.sample
= 1;
3274 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3275 if (state
->es_shader
) {
3276 var
->data
.precision
=
3277 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3280 if (qual
->flags
.q
.patch
)
3281 var
->data
.patch
= 1;
3283 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3284 var
->type
= glsl_type::error_type
;
3285 _mesa_glsl_error(loc
, state
,
3286 "`attribute' variables may not be declared in the "
3288 _mesa_shader_stage_to_string(state
->stage
));
3291 /* Disallow layout qualifiers which may only appear on layout declarations. */
3292 if (qual
->flags
.q
.prim_type
) {
3293 _mesa_glsl_error(loc
, state
,
3294 "Primitive type may only be specified on GS input or output "
3295 "layout declaration, not on variables.");
3298 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3300 * "However, the const qualifier cannot be used with out or inout."
3302 * The same section of the GLSL 4.40 spec further clarifies this saying:
3304 * "The const qualifier cannot be used with out or inout, or a
3305 * compile-time error results."
3307 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3308 _mesa_glsl_error(loc
, state
,
3309 "`const' may not be applied to `out' or `inout' "
3310 "function parameters");
3313 /* If there is no qualifier that changes the mode of the variable, leave
3314 * the setting alone.
3316 assert(var
->data
.mode
!= ir_var_temporary
);
3317 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3318 var
->data
.mode
= ir_var_function_inout
;
3319 else if (qual
->flags
.q
.in
)
3320 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3321 else if (qual
->flags
.q
.attribute
3322 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3323 var
->data
.mode
= ir_var_shader_in
;
3324 else if (qual
->flags
.q
.out
)
3325 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3326 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3327 var
->data
.mode
= ir_var_shader_out
;
3328 else if (qual
->flags
.q
.uniform
)
3329 var
->data
.mode
= ir_var_uniform
;
3330 else if (qual
->flags
.q
.buffer
)
3331 var
->data
.mode
= ir_var_shader_storage
;
3332 else if (qual
->flags
.q
.shared_storage
)
3333 var
->data
.mode
= ir_var_shader_shared
;
3335 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3336 /* User-defined ins/outs are not permitted in compute shaders. */
3337 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3338 _mesa_glsl_error(loc
, state
,
3339 "user-defined input and output variables are not "
3340 "permitted in compute shaders");
3343 /* This variable is being used to link data between shader stages (in
3344 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3345 * that is allowed for such purposes.
3347 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3349 * "The varying qualifier can be used only with the data types
3350 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3353 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3354 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3356 * "Fragment inputs can only be signed and unsigned integers and
3357 * integer vectors, float, floating-point vectors, matrices, or
3358 * arrays of these. Structures cannot be input.
3360 * Similar text exists in the section on vertex shader outputs.
3362 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3363 * 3.00 spec allows structs as well. Varying structs are also allowed
3366 switch (var
->type
->get_scalar_type()->base_type
) {
3367 case GLSL_TYPE_FLOAT
:
3368 /* Ok in all GLSL versions */
3370 case GLSL_TYPE_UINT
:
3372 if (state
->is_version(130, 300))
3374 _mesa_glsl_error(loc
, state
,
3375 "varying variables must be of base type float in %s",
3376 state
->get_version_string());
3378 case GLSL_TYPE_STRUCT
:
3379 if (state
->is_version(150, 300))
3381 _mesa_glsl_error(loc
, state
,
3382 "varying variables may not be of type struct");
3384 case GLSL_TYPE_DOUBLE
:
3387 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3392 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3393 switch (state
->stage
) {
3394 case MESA_SHADER_VERTEX
:
3395 if (var
->data
.mode
== ir_var_shader_out
)
3396 var
->data
.invariant
= true;
3398 case MESA_SHADER_TESS_CTRL
:
3399 case MESA_SHADER_TESS_EVAL
:
3400 case MESA_SHADER_GEOMETRY
:
3401 if ((var
->data
.mode
== ir_var_shader_in
)
3402 || (var
->data
.mode
== ir_var_shader_out
))
3403 var
->data
.invariant
= true;
3405 case MESA_SHADER_FRAGMENT
:
3406 if (var
->data
.mode
== ir_var_shader_in
)
3407 var
->data
.invariant
= true;
3409 case MESA_SHADER_COMPUTE
:
3410 /* Invariance isn't meaningful in compute shaders. */
3415 var
->data
.interpolation
=
3416 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
3419 /* Does the declaration use the deprecated 'attribute' or 'varying'
3422 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3423 || qual
->flags
.q
.varying
;
3426 /* Validate auxiliary storage qualifiers */
3428 /* From section 4.3.4 of the GLSL 1.30 spec:
3429 * "It is an error to use centroid in in a vertex shader."
3431 * From section 4.3.4 of the GLSL ES 3.00 spec:
3432 * "It is an error to use centroid in or interpolation qualifiers in
3433 * a vertex shader input."
3436 /* Section 4.3.6 of the GLSL 1.30 specification states:
3437 * "It is an error to use centroid out in a fragment shader."
3439 * The GL_ARB_shading_language_420pack extension specification states:
3440 * "It is an error to use auxiliary storage qualifiers or interpolation
3441 * qualifiers on an output in a fragment shader."
3443 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3444 _mesa_glsl_error(loc
, state
,
3445 "sample qualifier may only be used on `in` or `out` "
3446 "variables between shader stages");
3448 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3449 _mesa_glsl_error(loc
, state
,
3450 "centroid qualifier may only be used with `in', "
3451 "`out' or `varying' variables between shader stages");
3454 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3455 _mesa_glsl_error(loc
, state
,
3456 "the shared storage qualifiers can only be used with "
3460 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3464 * Get the variable that is being redeclared by this declaration
3466 * Semantic checks to verify the validity of the redeclaration are also
3467 * performed. If semantic checks fail, compilation error will be emitted via
3468 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3471 * A pointer to an existing variable in the current scope if the declaration
3472 * is a redeclaration, \c NULL otherwise.
3474 static ir_variable
*
3475 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3476 struct _mesa_glsl_parse_state
*state
,
3477 bool allow_all_redeclarations
)
3479 /* Check if this declaration is actually a re-declaration, either to
3480 * resize an array or add qualifiers to an existing variable.
3482 * This is allowed for variables in the current scope, or when at
3483 * global scope (for built-ins in the implicit outer scope).
3485 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3486 if (earlier
== NULL
||
3487 (state
->current_function
!= NULL
&&
3488 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3493 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3495 * "It is legal to declare an array without a size and then
3496 * later re-declare the same name as an array of the same
3497 * type and specify a size."
3499 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3500 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3501 /* FINISHME: This doesn't match the qualifiers on the two
3502 * FINISHME: declarations. It's not 100% clear whether this is
3503 * FINISHME: required or not.
3506 const unsigned size
= unsigned(var
->type
->array_size());
3507 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3508 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3509 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3511 earlier
->data
.max_array_access
);
3514 earlier
->type
= var
->type
;
3517 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3518 state
->is_version(150, 0))
3519 && strcmp(var
->name
, "gl_FragCoord") == 0
3520 && earlier
->type
== var
->type
3521 && earlier
->data
.mode
== var
->data
.mode
) {
3522 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3525 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3526 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3528 /* According to section 4.3.7 of the GLSL 1.30 spec,
3529 * the following built-in varaibles can be redeclared with an
3530 * interpolation qualifier:
3533 * * gl_FrontSecondaryColor
3534 * * gl_BackSecondaryColor
3536 * * gl_SecondaryColor
3538 } else if (state
->is_version(130, 0)
3539 && (strcmp(var
->name
, "gl_FrontColor") == 0
3540 || strcmp(var
->name
, "gl_BackColor") == 0
3541 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3542 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3543 || strcmp(var
->name
, "gl_Color") == 0
3544 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3545 && earlier
->type
== var
->type
3546 && earlier
->data
.mode
== var
->data
.mode
) {
3547 earlier
->data
.interpolation
= var
->data
.interpolation
;
3549 /* Layout qualifiers for gl_FragDepth. */
3550 } else if ((state
->AMD_conservative_depth_enable
||
3551 state
->ARB_conservative_depth_enable
)
3552 && strcmp(var
->name
, "gl_FragDepth") == 0
3553 && earlier
->type
== var
->type
3554 && earlier
->data
.mode
== var
->data
.mode
) {
3556 /** From the AMD_conservative_depth spec:
3557 * Within any shader, the first redeclarations of gl_FragDepth
3558 * must appear before any use of gl_FragDepth.
3560 if (earlier
->data
.used
) {
3561 _mesa_glsl_error(&loc
, state
,
3562 "the first redeclaration of gl_FragDepth "
3563 "must appear before any use of gl_FragDepth");
3566 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3567 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3568 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3569 _mesa_glsl_error(&loc
, state
,
3570 "gl_FragDepth: depth layout is declared here "
3571 "as '%s, but it was previously declared as "
3573 depth_layout_string(var
->data
.depth_layout
),
3574 depth_layout_string(earlier
->data
.depth_layout
));
3577 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3579 } else if (allow_all_redeclarations
) {
3580 if (earlier
->data
.mode
!= var
->data
.mode
) {
3581 _mesa_glsl_error(&loc
, state
,
3582 "redeclaration of `%s' with incorrect qualifiers",
3584 } else if (earlier
->type
!= var
->type
) {
3585 _mesa_glsl_error(&loc
, state
,
3586 "redeclaration of `%s' has incorrect type",
3590 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3597 * Generate the IR for an initializer in a variable declaration
3600 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3601 ast_fully_specified_type
*type
,
3602 exec_list
*initializer_instructions
,
3603 struct _mesa_glsl_parse_state
*state
)
3605 ir_rvalue
*result
= NULL
;
3607 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3609 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3611 * "All uniform variables are read-only and are initialized either
3612 * directly by an application via API commands, or indirectly by
3615 if (var
->data
.mode
== ir_var_uniform
) {
3616 state
->check_version(120, 0, &initializer_loc
,
3617 "cannot initialize uniform %s",
3621 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3623 * "Buffer variables cannot have initializers."
3625 if (var
->data
.mode
== ir_var_shader_storage
) {
3626 _mesa_glsl_error(&initializer_loc
, state
,
3627 "cannot initialize buffer variable %s",
3631 /* From section 4.1.7 of the GLSL 4.40 spec:
3633 * "Opaque variables [...] are initialized only through the
3634 * OpenGL API; they cannot be declared with an initializer in a
3637 if (var
->type
->contains_opaque()) {
3638 _mesa_glsl_error(&initializer_loc
, state
,
3639 "cannot initialize opaque variable %s",
3643 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3644 _mesa_glsl_error(&initializer_loc
, state
,
3645 "cannot initialize %s shader input / %s %s",
3646 _mesa_shader_stage_to_string(state
->stage
),
3647 (state
->stage
== MESA_SHADER_VERTEX
)
3648 ? "attribute" : "varying",
3652 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
3653 _mesa_glsl_error(&initializer_loc
, state
,
3654 "cannot initialize %s shader output %s",
3655 _mesa_shader_stage_to_string(state
->stage
),
3659 /* If the initializer is an ast_aggregate_initializer, recursively store
3660 * type information from the LHS into it, so that its hir() function can do
3663 if (decl
->initializer
->oper
== ast_aggregate
)
3664 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3666 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3667 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3669 /* Calculate the constant value if this is a const or uniform
3672 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
3674 * "Declarations of globals without a storage qualifier, or with
3675 * just the const qualifier, may include initializers, in which case
3676 * they will be initialized before the first line of main() is
3677 * executed. Such initializers must be a constant expression."
3679 * The same section of the GLSL ES 3.00.4 spec has similar language.
3681 if (type
->qualifier
.flags
.q
.constant
3682 || type
->qualifier
.flags
.q
.uniform
3683 || (state
->es_shader
&& state
->current_function
== NULL
)) {
3684 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3686 if (new_rhs
!= NULL
) {
3689 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
3692 * "A constant expression is one of
3696 * - an expression formed by an operator on operands that are
3697 * all constant expressions, including getting an element of
3698 * a constant array, or a field of a constant structure, or
3699 * components of a constant vector. However, the sequence
3700 * operator ( , ) and the assignment operators ( =, +=, ...)
3701 * are not included in the operators that can create a
3702 * constant expression."
3704 * Section 12.43 (Sequence operator and constant expressions) says:
3706 * "Should the following construct be allowed?
3710 * The expression within the brackets uses the sequence operator
3711 * (',') and returns the integer 3 so the construct is declaring
3712 * a single-dimensional array of size 3. In some languages, the
3713 * construct declares a two-dimensional array. It would be
3714 * preferable to make this construct illegal to avoid confusion.
3716 * One possibility is to change the definition of the sequence
3717 * operator so that it does not return a constant-expression and
3718 * hence cannot be used to declare an array size.
3720 * RESOLUTION: The result of a sequence operator is not a
3721 * constant-expression."
3723 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
3724 * contains language almost identical to the section 4.3.3 in the
3725 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
3728 ir_constant
*constant_value
= rhs
->constant_expression_value();
3729 if (!constant_value
||
3730 (state
->is_version(430, 300) &&
3731 decl
->initializer
->has_sequence_subexpression())) {
3732 const char *const variable_mode
=
3733 (type
->qualifier
.flags
.q
.constant
)
3735 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
3737 /* If ARB_shading_language_420pack is enabled, initializers of
3738 * const-qualified local variables do not have to be constant
3739 * expressions. Const-qualified global variables must still be
3740 * initialized with constant expressions.
3742 if (!state
->has_420pack()
3743 || state
->current_function
== NULL
) {
3744 _mesa_glsl_error(& initializer_loc
, state
,
3745 "initializer of %s variable `%s' must be a "
3746 "constant expression",
3749 if (var
->type
->is_numeric()) {
3750 /* Reduce cascading errors. */
3751 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3752 ? ir_constant::zero(state
, var
->type
) : NULL
;
3756 rhs
= constant_value
;
3757 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3758 ? constant_value
: NULL
;
3761 if (var
->type
->is_numeric()) {
3762 /* Reduce cascading errors. */
3763 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3764 ? ir_constant::zero(state
, var
->type
) : NULL
;
3769 if (rhs
&& !rhs
->type
->is_error()) {
3770 bool temp
= var
->data
.read_only
;
3771 if (type
->qualifier
.flags
.q
.constant
)
3772 var
->data
.read_only
= false;
3774 /* Never emit code to initialize a uniform.
3776 const glsl_type
*initializer_type
;
3777 if (!type
->qualifier
.flags
.q
.uniform
) {
3778 do_assignment(initializer_instructions
, state
,
3783 type
->get_location());
3784 initializer_type
= result
->type
;
3786 initializer_type
= rhs
->type
;
3788 var
->constant_initializer
= rhs
->constant_expression_value();
3789 var
->data
.has_initializer
= true;
3791 /* If the declared variable is an unsized array, it must inherrit
3792 * its full type from the initializer. A declaration such as
3794 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3798 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3800 * The assignment generated in the if-statement (below) will also
3801 * automatically handle this case for non-uniforms.
3803 * If the declared variable is not an array, the types must
3804 * already match exactly. As a result, the type assignment
3805 * here can be done unconditionally. For non-uniforms the call
3806 * to do_assignment can change the type of the initializer (via
3807 * the implicit conversion rules). For uniforms the initializer
3808 * must be a constant expression, and the type of that expression
3809 * was validated above.
3811 var
->type
= initializer_type
;
3813 var
->data
.read_only
= temp
;
3820 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3821 YYLTYPE loc
, ir_variable
*var
,
3822 unsigned num_vertices
,
3824 const char *var_category
)
3826 if (var
->type
->is_unsized_array()) {
3827 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3829 * All geometry shader input unsized array declarations will be
3830 * sized by an earlier input layout qualifier, when present, as per
3831 * the following table.
3833 * Followed by a table mapping each allowed input layout qualifier to
3834 * the corresponding input length.
3836 * Similarly for tessellation control shader outputs.
3838 if (num_vertices
!= 0)
3839 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3842 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3843 * includes the following examples of compile-time errors:
3845 * // code sequence within one shader...
3846 * in vec4 Color1[]; // size unknown
3847 * ...Color1.length()...// illegal, length() unknown
3848 * in vec4 Color2[2]; // size is 2
3849 * ...Color1.length()...// illegal, Color1 still has no size
3850 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3851 * layout(lines) in; // legal, input size is 2, matching
3852 * in vec4 Color4[3]; // illegal, contradicts layout
3855 * To detect the case illustrated by Color3, we verify that the size of
3856 * an explicitly-sized array matches the size of any previously declared
3857 * explicitly-sized array. To detect the case illustrated by Color4, we
3858 * verify that the size of an explicitly-sized array is consistent with
3859 * any previously declared input layout.
3861 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3862 _mesa_glsl_error(&loc
, state
,
3863 "%s size contradicts previously declared layout "
3864 "(size is %u, but layout requires a size of %u)",
3865 var_category
, var
->type
->length
, num_vertices
);
3866 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3867 _mesa_glsl_error(&loc
, state
,
3868 "%s sizes are inconsistent (size is %u, but a "
3869 "previous declaration has size %u)",
3870 var_category
, var
->type
->length
, *size
);
3872 *size
= var
->type
->length
;
3878 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3879 YYLTYPE loc
, ir_variable
*var
)
3881 unsigned num_vertices
= 0;
3883 if (state
->tcs_output_vertices_specified
) {
3884 if (!state
->out_qualifier
->vertices
->
3885 process_qualifier_constant(state
, "vertices",
3886 &num_vertices
, false)) {
3890 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
3891 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
3892 "GL_MAX_PATCH_VERTICES", num_vertices
);
3897 if (!var
->type
->is_array() && !var
->data
.patch
) {
3898 _mesa_glsl_error(&loc
, state
,
3899 "tessellation control shader outputs must be arrays");
3901 /* To avoid cascading failures, short circuit the checks below. */
3905 if (var
->data
.patch
)
3908 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3909 &state
->tcs_output_size
,
3910 "tessellation control shader output");
3914 * Do additional processing necessary for tessellation control/evaluation shader
3915 * input declarations. This covers both interface block arrays and bare input
3919 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3920 YYLTYPE loc
, ir_variable
*var
)
3922 if (!var
->type
->is_array() && !var
->data
.patch
) {
3923 _mesa_glsl_error(&loc
, state
,
3924 "per-vertex tessellation shader inputs must be arrays");
3925 /* Avoid cascading failures. */
3929 if (var
->data
.patch
)
3932 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
3933 if (var
->type
->is_unsized_array()) {
3934 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3935 state
->Const
.MaxPatchVertices
);
3941 * Do additional processing necessary for geometry shader input declarations
3942 * (this covers both interface blocks arrays and bare input variables).
3945 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3946 YYLTYPE loc
, ir_variable
*var
)
3948 unsigned num_vertices
= 0;
3950 if (state
->gs_input_prim_type_specified
) {
3951 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
3954 /* Geometry shader input variables must be arrays. Caller should have
3955 * reported an error for this.
3957 if (!var
->type
->is_array()) {
3958 assert(state
->error
);
3960 /* To avoid cascading failures, short circuit the checks below. */
3964 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3965 &state
->gs_input_size
,
3966 "geometry shader input");
3970 validate_identifier(const char *identifier
, YYLTYPE loc
,
3971 struct _mesa_glsl_parse_state
*state
)
3973 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3975 * "Identifiers starting with "gl_" are reserved for use by
3976 * OpenGL, and may not be declared in a shader as either a
3977 * variable or a function."
3979 if (is_gl_identifier(identifier
)) {
3980 _mesa_glsl_error(&loc
, state
,
3981 "identifier `%s' uses reserved `gl_' prefix",
3983 } else if (strstr(identifier
, "__")) {
3984 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3987 * "In addition, all identifiers containing two
3988 * consecutive underscores (__) are reserved as
3989 * possible future keywords."
3991 * The intention is that names containing __ are reserved for internal
3992 * use by the implementation, and names prefixed with GL_ are reserved
3993 * for use by Khronos. Names simply containing __ are dangerous to use,
3994 * but should be allowed.
3996 * A future version of the GLSL specification will clarify this.
3998 _mesa_glsl_warning(&loc
, state
,
3999 "identifier `%s' uses reserved `__' string",
4005 ast_declarator_list::hir(exec_list
*instructions
,
4006 struct _mesa_glsl_parse_state
*state
)
4009 const struct glsl_type
*decl_type
;
4010 const char *type_name
= NULL
;
4011 ir_rvalue
*result
= NULL
;
4012 YYLTYPE loc
= this->get_location();
4014 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4016 * "To ensure that a particular output variable is invariant, it is
4017 * necessary to use the invariant qualifier. It can either be used to
4018 * qualify a previously declared variable as being invariant
4020 * invariant gl_Position; // make existing gl_Position be invariant"
4022 * In these cases the parser will set the 'invariant' flag in the declarator
4023 * list, and the type will be NULL.
4025 if (this->invariant
) {
4026 assert(this->type
== NULL
);
4028 if (state
->current_function
!= NULL
) {
4029 _mesa_glsl_error(& loc
, state
,
4030 "all uses of `invariant' keyword must be at global "
4034 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4035 assert(decl
->array_specifier
== NULL
);
4036 assert(decl
->initializer
== NULL
);
4038 ir_variable
*const earlier
=
4039 state
->symbols
->get_variable(decl
->identifier
);
4040 if (earlier
== NULL
) {
4041 _mesa_glsl_error(& loc
, state
,
4042 "undeclared variable `%s' cannot be marked "
4043 "invariant", decl
->identifier
);
4044 } else if (!is_varying_var(earlier
, state
->stage
)) {
4045 _mesa_glsl_error(&loc
, state
,
4046 "`%s' cannot be marked invariant; interfaces between "
4047 "shader stages only.", decl
->identifier
);
4048 } else if (earlier
->data
.used
) {
4049 _mesa_glsl_error(& loc
, state
,
4050 "variable `%s' may not be redeclared "
4051 "`invariant' after being used",
4054 earlier
->data
.invariant
= true;
4058 /* Invariant redeclarations do not have r-values.
4063 if (this->precise
) {
4064 assert(this->type
== NULL
);
4066 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4067 assert(decl
->array_specifier
== NULL
);
4068 assert(decl
->initializer
== NULL
);
4070 ir_variable
*const earlier
=
4071 state
->symbols
->get_variable(decl
->identifier
);
4072 if (earlier
== NULL
) {
4073 _mesa_glsl_error(& loc
, state
,
4074 "undeclared variable `%s' cannot be marked "
4075 "precise", decl
->identifier
);
4076 } else if (state
->current_function
!= NULL
&&
4077 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4078 /* Note: we have to check if we're in a function, since
4079 * builtins are treated as having come from another scope.
4081 _mesa_glsl_error(& loc
, state
,
4082 "variable `%s' from an outer scope may not be "
4083 "redeclared `precise' in this scope",
4085 } else if (earlier
->data
.used
) {
4086 _mesa_glsl_error(& loc
, state
,
4087 "variable `%s' may not be redeclared "
4088 "`precise' after being used",
4091 earlier
->data
.precise
= true;
4095 /* Precise redeclarations do not have r-values either. */
4099 assert(this->type
!= NULL
);
4100 assert(!this->invariant
);
4101 assert(!this->precise
);
4103 /* The type specifier may contain a structure definition. Process that
4104 * before any of the variable declarations.
4106 (void) this->type
->specifier
->hir(instructions
, state
);
4108 decl_type
= this->type
->glsl_type(& type_name
, state
);
4110 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4111 * "Buffer variables may only be declared inside interface blocks
4112 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4113 * shader storage blocks. It is a compile-time error to declare buffer
4114 * variables at global scope (outside a block)."
4116 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4117 _mesa_glsl_error(&loc
, state
,
4118 "buffer variables cannot be declared outside "
4119 "interface blocks");
4122 /* An offset-qualified atomic counter declaration sets the default
4123 * offset for the next declaration within the same atomic counter
4126 if (decl_type
&& decl_type
->contains_atomic()) {
4127 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4128 type
->qualifier
.flags
.q
.explicit_offset
) {
4129 unsigned qual_binding
;
4130 unsigned qual_offset
;
4131 if (process_qualifier_constant(state
, &loc
, "binding",
4132 type
->qualifier
.binding
,
4134 && process_qualifier_constant(state
, &loc
, "offset",
4135 type
->qualifier
.offset
,
4137 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4142 if (this->declarations
.is_empty()) {
4143 /* If there is no structure involved in the program text, there are two
4144 * possible scenarios:
4146 * - The program text contained something like 'vec4;'. This is an
4147 * empty declaration. It is valid but weird. Emit a warning.
4149 * - The program text contained something like 'S;' and 'S' is not the
4150 * name of a known structure type. This is both invalid and weird.
4153 * - The program text contained something like 'mediump float;'
4154 * when the programmer probably meant 'precision mediump
4155 * float;' Emit a warning with a description of what they
4156 * probably meant to do.
4158 * Note that if decl_type is NULL and there is a structure involved,
4159 * there must have been some sort of error with the structure. In this
4160 * case we assume that an error was already generated on this line of
4161 * code for the structure. There is no need to generate an additional,
4164 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4167 if (decl_type
== NULL
) {
4168 _mesa_glsl_error(&loc
, state
,
4169 "invalid type `%s' in empty declaration",
4171 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4172 /* Empty atomic counter declarations are allowed and useful
4173 * to set the default offset qualifier.
4176 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4177 if (this->type
->specifier
->structure
!= NULL
) {
4178 _mesa_glsl_error(&loc
, state
,
4179 "precision qualifiers can't be applied "
4182 static const char *const precision_names
[] = {
4189 _mesa_glsl_warning(&loc
, state
,
4190 "empty declaration with precision qualifier, "
4191 "to set the default precision, use "
4192 "`precision %s %s;'",
4193 precision_names
[this->type
->qualifier
.precision
],
4196 } else if (this->type
->specifier
->structure
== NULL
) {
4197 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4201 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4202 const struct glsl_type
*var_type
;
4204 const char *identifier
= decl
->identifier
;
4205 /* FINISHME: Emit a warning if a variable declaration shadows a
4206 * FINISHME: declaration at a higher scope.
4209 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4210 if (type_name
!= NULL
) {
4211 _mesa_glsl_error(& loc
, state
,
4212 "invalid type `%s' in declaration of `%s'",
4213 type_name
, decl
->identifier
);
4215 _mesa_glsl_error(& loc
, state
,
4216 "invalid type in declaration of `%s'",
4222 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4226 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4228 _mesa_glsl_error(& loc
, state
,
4229 "invalid type in declaration of `%s'",
4231 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4236 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4239 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4241 /* The 'varying in' and 'varying out' qualifiers can only be used with
4242 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4245 if (this->type
->qualifier
.flags
.q
.varying
) {
4246 if (this->type
->qualifier
.flags
.q
.in
) {
4247 _mesa_glsl_error(& loc
, state
,
4248 "`varying in' qualifier in declaration of "
4249 "`%s' only valid for geometry shaders using "
4250 "ARB_geometry_shader4 or EXT_geometry_shader4",
4252 } else if (this->type
->qualifier
.flags
.q
.out
) {
4253 _mesa_glsl_error(& loc
, state
,
4254 "`varying out' qualifier in declaration of "
4255 "`%s' only valid for geometry shaders using "
4256 "ARB_geometry_shader4 or EXT_geometry_shader4",
4261 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4263 * "Global variables can only use the qualifiers const,
4264 * attribute, uniform, or varying. Only one may be
4267 * Local variables can only use the qualifier const."
4269 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4270 * any extension that adds the 'layout' keyword.
4272 if (!state
->is_version(130, 300)
4273 && !state
->has_explicit_attrib_location()
4274 && !state
->has_separate_shader_objects()
4275 && !state
->ARB_fragment_coord_conventions_enable
) {
4276 if (this->type
->qualifier
.flags
.q
.out
) {
4277 _mesa_glsl_error(& loc
, state
,
4278 "`out' qualifier in declaration of `%s' "
4279 "only valid for function parameters in %s",
4280 decl
->identifier
, state
->get_version_string());
4282 if (this->type
->qualifier
.flags
.q
.in
) {
4283 _mesa_glsl_error(& loc
, state
,
4284 "`in' qualifier in declaration of `%s' "
4285 "only valid for function parameters in %s",
4286 decl
->identifier
, state
->get_version_string());
4288 /* FINISHME: Test for other invalid qualifiers. */
4291 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4293 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4296 if (this->type
->qualifier
.flags
.q
.invariant
) {
4297 if (!is_varying_var(var
, state
->stage
)) {
4298 _mesa_glsl_error(&loc
, state
,
4299 "`%s' cannot be marked invariant; interfaces between "
4300 "shader stages only", var
->name
);
4304 if (state
->current_function
!= NULL
) {
4305 const char *mode
= NULL
;
4306 const char *extra
= "";
4308 /* There is no need to check for 'inout' here because the parser will
4309 * only allow that in function parameter lists.
4311 if (this->type
->qualifier
.flags
.q
.attribute
) {
4313 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4314 mode
= "subroutine uniform";
4315 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4317 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4319 } else if (this->type
->qualifier
.flags
.q
.in
) {
4321 extra
= " or in function parameter list";
4322 } else if (this->type
->qualifier
.flags
.q
.out
) {
4324 extra
= " or in function parameter list";
4328 _mesa_glsl_error(& loc
, state
,
4329 "%s variable `%s' must be declared at "
4331 mode
, var
->name
, extra
);
4333 } else if (var
->data
.mode
== ir_var_shader_in
) {
4334 var
->data
.read_only
= true;
4336 if (state
->stage
== MESA_SHADER_VERTEX
) {
4337 bool error_emitted
= false;
4339 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4341 * "Vertex shader inputs can only be float, floating-point
4342 * vectors, matrices, signed and unsigned integers and integer
4343 * vectors. Vertex shader inputs can also form arrays of these
4344 * types, but not structures."
4346 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4348 * "Vertex shader inputs can only be float, floating-point
4349 * vectors, matrices, signed and unsigned integers and integer
4350 * vectors. They cannot be arrays or structures."
4352 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4354 * "The attribute qualifier can be used only with float,
4355 * floating-point vectors, and matrices. Attribute variables
4356 * cannot be declared as arrays or structures."
4358 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4360 * "Vertex shader inputs can only be float, floating-point
4361 * vectors, matrices, signed and unsigned integers and integer
4362 * vectors. Vertex shader inputs cannot be arrays or
4365 const glsl_type
*check_type
= var
->type
->without_array();
4367 switch (check_type
->base_type
) {
4368 case GLSL_TYPE_FLOAT
:
4370 case GLSL_TYPE_UINT
:
4372 if (state
->is_version(120, 300))
4374 case GLSL_TYPE_DOUBLE
:
4375 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4379 _mesa_glsl_error(& loc
, state
,
4380 "vertex shader input / attribute cannot have "
4382 var
->type
->is_array() ? "array of " : "",
4384 error_emitted
= true;
4387 if (!error_emitted
&& var
->type
->is_array() &&
4388 !state
->check_version(150, 0, &loc
,
4389 "vertex shader input / attribute "
4390 "cannot have array type")) {
4391 error_emitted
= true;
4393 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4394 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4396 * Geometry shader input variables get the per-vertex values
4397 * written out by vertex shader output variables of the same
4398 * names. Since a geometry shader operates on a set of
4399 * vertices, each input varying variable (or input block, see
4400 * interface blocks below) needs to be declared as an array.
4402 if (!var
->type
->is_array()) {
4403 _mesa_glsl_error(&loc
, state
,
4404 "geometry shader inputs must be arrays");
4407 handle_geometry_shader_input_decl(state
, loc
, var
);
4408 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4409 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4411 * It is a compile-time error to declare a fragment shader
4412 * input with, or that contains, any of the following types:
4416 * * An array of arrays
4417 * * An array of structures
4418 * * A structure containing an array
4419 * * A structure containing a structure
4421 if (state
->es_shader
) {
4422 const glsl_type
*check_type
= var
->type
->without_array();
4423 if (check_type
->is_boolean() ||
4424 check_type
->contains_opaque()) {
4425 _mesa_glsl_error(&loc
, state
,
4426 "fragment shader input cannot have type %s",
4429 if (var
->type
->is_array() &&
4430 var
->type
->fields
.array
->is_array()) {
4431 _mesa_glsl_error(&loc
, state
,
4433 "cannot have an array of arrays",
4434 _mesa_shader_stage_to_string(state
->stage
));
4436 if (var
->type
->is_array() &&
4437 var
->type
->fields
.array
->is_record()) {
4438 _mesa_glsl_error(&loc
, state
,
4439 "fragment shader input "
4440 "cannot have an array of structs");
4442 if (var
->type
->is_record()) {
4443 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4444 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4445 var
->type
->fields
.structure
[i
].type
->is_record())
4446 _mesa_glsl_error(&loc
, state
,
4447 "fragement shader input cannot have "
4448 "a struct that contains an "
4453 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4454 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4455 handle_tess_shader_input_decl(state
, loc
, var
);
4457 } else if (var
->data
.mode
== ir_var_shader_out
) {
4458 const glsl_type
*check_type
= var
->type
->without_array();
4460 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4462 * It is a compile-time error to declare a vertex, tessellation
4463 * evaluation, tessellation control, or geometry shader output
4464 * that contains any of the following:
4466 * * A Boolean type (bool, bvec2 ...)
4469 if (check_type
->is_boolean() || check_type
->contains_opaque())
4470 _mesa_glsl_error(&loc
, state
,
4471 "%s shader output cannot have type %s",
4472 _mesa_shader_stage_to_string(state
->stage
),
4475 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4477 * It is a compile-time error to declare a fragment shader output
4478 * that contains any of the following:
4480 * * A Boolean type (bool, bvec2 ...)
4481 * * A double-precision scalar or vector (double, dvec2 ...)
4486 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4487 if (check_type
->is_record() || check_type
->is_matrix())
4488 _mesa_glsl_error(&loc
, state
,
4489 "fragment shader output "
4490 "cannot have struct or matrix type");
4491 switch (check_type
->base_type
) {
4492 case GLSL_TYPE_UINT
:
4494 case GLSL_TYPE_FLOAT
:
4497 _mesa_glsl_error(&loc
, state
,
4498 "fragment shader output cannot have "
4499 "type %s", check_type
->name
);
4503 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4505 * It is a compile-time error to declare a vertex shader output
4506 * with, or that contains, any of the following types:
4510 * * An array of arrays
4511 * * An array of structures
4512 * * A structure containing an array
4513 * * A structure containing a structure
4515 * It is a compile-time error to declare a fragment shader output
4516 * with, or that contains, any of the following types:
4522 * * An array of array
4524 if (state
->es_shader
) {
4525 if (var
->type
->is_array() &&
4526 var
->type
->fields
.array
->is_array()) {
4527 _mesa_glsl_error(&loc
, state
,
4529 "cannot have an array of arrays",
4530 _mesa_shader_stage_to_string(state
->stage
));
4532 if (state
->stage
== MESA_SHADER_VERTEX
) {
4533 if (var
->type
->is_array() &&
4534 var
->type
->fields
.array
->is_record()) {
4535 _mesa_glsl_error(&loc
, state
,
4536 "vertex shader output "
4537 "cannot have an array of structs");
4539 if (var
->type
->is_record()) {
4540 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4541 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4542 var
->type
->fields
.structure
[i
].type
->is_record())
4543 _mesa_glsl_error(&loc
, state
,
4544 "vertex shader output cannot have a "
4545 "struct that contains an "
4552 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4553 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4555 } else if (var
->type
->contains_subroutine()) {
4556 /* declare subroutine uniforms as hidden */
4557 var
->data
.how_declared
= ir_var_hidden
;
4560 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4561 * so must integer vertex outputs.
4563 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4564 * "Fragment shader inputs that are signed or unsigned integers or
4565 * integer vectors must be qualified with the interpolation qualifier
4568 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4569 * "Fragment shader inputs that are, or contain, signed or unsigned
4570 * integers or integer vectors must be qualified with the
4571 * interpolation qualifier flat."
4573 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4574 * "Vertex shader outputs that are, or contain, signed or unsigned
4575 * integers or integer vectors must be qualified with the
4576 * interpolation qualifier flat."
4578 * Note that prior to GLSL 1.50, this requirement applied to vertex
4579 * outputs rather than fragment inputs. That creates problems in the
4580 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4581 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4582 * apply the restriction to both vertex outputs and fragment inputs.
4584 * Note also that the desktop GLSL specs are missing the text "or
4585 * contain"; this is presumably an oversight, since there is no
4586 * reasonable way to interpolate a fragment shader input that contains
4589 if (state
->is_version(130, 300) &&
4590 var
->type
->contains_integer() &&
4591 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4592 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4593 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4594 && state
->es_shader
))) {
4595 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4596 "vertex output" : "fragment input";
4597 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4598 "an integer, then it must be qualified with 'flat'",
4602 /* Double fragment inputs must be qualified with 'flat'. */
4603 if (var
->type
->contains_double() &&
4604 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4605 state
->stage
== MESA_SHADER_FRAGMENT
&&
4606 var
->data
.mode
== ir_var_shader_in
) {
4607 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4608 "a double, then it must be qualified with 'flat'",
4612 /* Interpolation qualifiers cannot be applied to 'centroid' and
4613 * 'centroid varying'.
4615 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4616 * "interpolation qualifiers may only precede the qualifiers in,
4617 * centroid in, out, or centroid out in a declaration. They do not apply
4618 * to the deprecated storage qualifiers varying or centroid varying."
4620 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4622 if (state
->is_version(130, 0)
4623 && this->type
->qualifier
.has_interpolation()
4624 && this->type
->qualifier
.flags
.q
.varying
) {
4626 const char *i
= this->type
->qualifier
.interpolation_string();
4629 if (this->type
->qualifier
.flags
.q
.centroid
)
4630 s
= "centroid varying";
4634 _mesa_glsl_error(&loc
, state
,
4635 "qualifier '%s' cannot be applied to the "
4636 "deprecated storage qualifier '%s'", i
, s
);
4640 /* Interpolation qualifiers can only apply to vertex shader outputs and
4641 * fragment shader inputs.
4643 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4644 * "Outputs from a vertex shader (out) and inputs to a fragment
4645 * shader (in) can be further qualified with one or more of these
4646 * interpolation qualifiers"
4648 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4649 * "These interpolation qualifiers may only precede the qualifiers
4650 * in, centroid in, out, or centroid out in a declaration. They do
4651 * not apply to inputs into a vertex shader or outputs from a
4654 if (state
->is_version(130, 300)
4655 && this->type
->qualifier
.has_interpolation()) {
4657 const char *i
= this->type
->qualifier
.interpolation_string();
4660 switch (state
->stage
) {
4661 case MESA_SHADER_VERTEX
:
4662 if (this->type
->qualifier
.flags
.q
.in
) {
4663 _mesa_glsl_error(&loc
, state
,
4664 "qualifier '%s' cannot be applied to vertex "
4665 "shader inputs", i
);
4668 case MESA_SHADER_FRAGMENT
:
4669 if (this->type
->qualifier
.flags
.q
.out
) {
4670 _mesa_glsl_error(&loc
, state
,
4671 "qualifier '%s' cannot be applied to fragment "
4672 "shader outputs", i
);
4681 /* From section 4.3.4 of the GLSL 4.00 spec:
4682 * "Input variables may not be declared using the patch in qualifier
4683 * in tessellation control or geometry shaders."
4685 * From section 4.3.6 of the GLSL 4.00 spec:
4686 * "It is an error to use patch out in a vertex, tessellation
4687 * evaluation, or geometry shader."
4689 * This doesn't explicitly forbid using them in a fragment shader, but
4690 * that's probably just an oversight.
4692 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4693 && this->type
->qualifier
.flags
.q
.patch
4694 && this->type
->qualifier
.flags
.q
.in
) {
4696 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4697 "tessellation evaluation shader");
4700 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4701 && this->type
->qualifier
.flags
.q
.patch
4702 && this->type
->qualifier
.flags
.q
.out
) {
4704 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4705 "tessellation control shader");
4708 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4710 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4711 state
->check_precision_qualifiers_allowed(&loc
);
4715 /* If a precision qualifier is allowed on a type, it is allowed on
4716 * an array of that type.
4718 if (!(this->type
->qualifier
.precision
== ast_precision_none
4719 || precision_qualifier_allowed(var
->type
->without_array()))) {
4721 _mesa_glsl_error(&loc
, state
,
4722 "precision qualifiers apply only to floating point"
4723 ", integer and opaque types");
4726 /* From section 4.1.7 of the GLSL 4.40 spec:
4728 * "[Opaque types] can only be declared as function
4729 * parameters or uniform-qualified variables."
4731 if (var_type
->contains_opaque() &&
4732 !this->type
->qualifier
.flags
.q
.uniform
) {
4733 _mesa_glsl_error(&loc
, state
,
4734 "opaque variables must be declared uniform");
4737 /* Process the initializer and add its instructions to a temporary
4738 * list. This list will be added to the instruction stream (below) after
4739 * the declaration is added. This is done because in some cases (such as
4740 * redeclarations) the declaration may not actually be added to the
4741 * instruction stream.
4743 exec_list initializer_instructions
;
4745 /* Examine var name here since var may get deleted in the next call */
4746 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4748 ir_variable
*earlier
=
4749 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4750 false /* allow_all_redeclarations */);
4751 if (earlier
!= NULL
) {
4753 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4754 _mesa_glsl_error(&loc
, state
,
4755 "`%s' has already been redeclared using "
4756 "gl_PerVertex", earlier
->name
);
4758 earlier
->data
.how_declared
= ir_var_declared_normally
;
4761 if (decl
->initializer
!= NULL
) {
4762 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4764 &initializer_instructions
, state
);
4766 validate_array_dimensions(var_type
, state
, &loc
);
4769 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4771 * "It is an error to write to a const variable outside of
4772 * its declaration, so they must be initialized when
4775 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4776 _mesa_glsl_error(& loc
, state
,
4777 "const declaration of `%s' must be initialized",
4781 if (state
->es_shader
) {
4782 const glsl_type
*const t
= (earlier
== NULL
)
4783 ? var
->type
: earlier
->type
;
4785 if (t
->is_unsized_array())
4786 /* Section 10.17 of the GLSL ES 1.00 specification states that
4787 * unsized array declarations have been removed from the language.
4788 * Arrays that are sized using an initializer are still explicitly
4789 * sized. However, GLSL ES 1.00 does not allow array
4790 * initializers. That is only allowed in GLSL ES 3.00.
4792 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4794 * "An array type can also be formed without specifying a size
4795 * if the definition includes an initializer:
4797 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4798 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4803 _mesa_glsl_error(& loc
, state
,
4804 "unsized array declarations are not allowed in "
4808 /* If the declaration is not a redeclaration, there are a few additional
4809 * semantic checks that must be applied. In addition, variable that was
4810 * created for the declaration should be added to the IR stream.
4812 if (earlier
== NULL
) {
4813 validate_identifier(decl
->identifier
, loc
, state
);
4815 /* Add the variable to the symbol table. Note that the initializer's
4816 * IR was already processed earlier (though it hasn't been emitted
4817 * yet), without the variable in scope.
4819 * This differs from most C-like languages, but it follows the GLSL
4820 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4823 * "Within a declaration, the scope of a name starts immediately
4824 * after the initializer if present or immediately after the name
4825 * being declared if not."
4827 if (!state
->symbols
->add_variable(var
)) {
4828 YYLTYPE loc
= this->get_location();
4829 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4830 "current scope", decl
->identifier
);
4834 /* Push the variable declaration to the top. It means that all the
4835 * variable declarations will appear in a funny last-to-first order,
4836 * but otherwise we run into trouble if a function is prototyped, a
4837 * global var is decled, then the function is defined with usage of
4838 * the global var. See glslparsertest's CorrectModule.frag.
4840 instructions
->push_head(var
);
4843 instructions
->append_list(&initializer_instructions
);
4847 /* Generally, variable declarations do not have r-values. However,
4848 * one is used for the declaration in
4850 * while (bool b = some_condition()) {
4854 * so we return the rvalue from the last seen declaration here.
4861 ast_parameter_declarator::hir(exec_list
*instructions
,
4862 struct _mesa_glsl_parse_state
*state
)
4865 const struct glsl_type
*type
;
4866 const char *name
= NULL
;
4867 YYLTYPE loc
= this->get_location();
4869 type
= this->type
->glsl_type(& name
, state
);
4873 _mesa_glsl_error(& loc
, state
,
4874 "invalid type `%s' in declaration of `%s'",
4875 name
, this->identifier
);
4877 _mesa_glsl_error(& loc
, state
,
4878 "invalid type in declaration of `%s'",
4882 type
= glsl_type::error_type
;
4885 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4887 * "Functions that accept no input arguments need not use void in the
4888 * argument list because prototypes (or definitions) are required and
4889 * therefore there is no ambiguity when an empty argument list "( )" is
4890 * declared. The idiom "(void)" as a parameter list is provided for
4893 * Placing this check here prevents a void parameter being set up
4894 * for a function, which avoids tripping up checks for main taking
4895 * parameters and lookups of an unnamed symbol.
4897 if (type
->is_void()) {
4898 if (this->identifier
!= NULL
)
4899 _mesa_glsl_error(& loc
, state
,
4900 "named parameter cannot have type `void'");
4906 if (formal_parameter
&& (this->identifier
== NULL
)) {
4907 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4911 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4912 * call already handled the "vec4[..] foo" case.
4914 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4916 if (!type
->is_error() && type
->is_unsized_array()) {
4917 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4919 type
= glsl_type::error_type
;
4923 ir_variable
*var
= new(ctx
)
4924 ir_variable(type
, this->identifier
, ir_var_function_in
);
4926 /* Apply any specified qualifiers to the parameter declaration. Note that
4927 * for function parameters the default mode is 'in'.
4929 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
4932 /* From section 4.1.7 of the GLSL 4.40 spec:
4934 * "Opaque variables cannot be treated as l-values; hence cannot
4935 * be used as out or inout function parameters, nor can they be
4938 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4939 && type
->contains_opaque()) {
4940 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
4941 "contain opaque variables");
4942 type
= glsl_type::error_type
;
4945 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
4947 * "When calling a function, expressions that do not evaluate to
4948 * l-values cannot be passed to parameters declared as out or inout."
4950 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
4952 * "Other binary or unary expressions, non-dereferenced arrays,
4953 * function names, swizzles with repeated fields, and constants
4954 * cannot be l-values."
4956 * So for GLSL 1.10, passing an array as an out or inout parameter is not
4957 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
4959 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4961 && !state
->check_version(120, 100, &loc
,
4962 "arrays cannot be out or inout parameters")) {
4963 type
= glsl_type::error_type
;
4966 instructions
->push_tail(var
);
4968 /* Parameter declarations do not have r-values.
4975 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
4977 exec_list
*ir_parameters
,
4978 _mesa_glsl_parse_state
*state
)
4980 ast_parameter_declarator
*void_param
= NULL
;
4983 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
4984 param
->formal_parameter
= formal
;
4985 param
->hir(ir_parameters
, state
);
4993 if ((void_param
!= NULL
) && (count
> 1)) {
4994 YYLTYPE loc
= void_param
->get_location();
4996 _mesa_glsl_error(& loc
, state
,
4997 "`void' parameter must be only parameter");
5003 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5005 /* IR invariants disallow function declarations or definitions
5006 * nested within other function definitions. But there is no
5007 * requirement about the relative order of function declarations
5008 * and definitions with respect to one another. So simply insert
5009 * the new ir_function block at the end of the toplevel instruction
5012 state
->toplevel_ir
->push_tail(f
);
5017 ast_function::hir(exec_list
*instructions
,
5018 struct _mesa_glsl_parse_state
*state
)
5021 ir_function
*f
= NULL
;
5022 ir_function_signature
*sig
= NULL
;
5023 exec_list hir_parameters
;
5024 YYLTYPE loc
= this->get_location();
5026 const char *const name
= identifier
;
5028 /* New functions are always added to the top-level IR instruction stream,
5029 * so this instruction list pointer is ignored. See also emit_function
5032 (void) instructions
;
5034 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5036 * "Function declarations (prototypes) cannot occur inside of functions;
5037 * they must be at global scope, or for the built-in functions, outside
5038 * the global scope."
5040 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5042 * "User defined functions may only be defined within the global scope."
5044 * Note that this language does not appear in GLSL 1.10.
5046 if ((state
->current_function
!= NULL
) &&
5047 state
->is_version(120, 100)) {
5048 YYLTYPE loc
= this->get_location();
5049 _mesa_glsl_error(&loc
, state
,
5050 "declaration of function `%s' not allowed within "
5051 "function body", name
);
5054 validate_identifier(name
, this->get_location(), state
);
5056 /* Convert the list of function parameters to HIR now so that they can be
5057 * used below to compare this function's signature with previously seen
5058 * signatures for functions with the same name.
5060 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5062 & hir_parameters
, state
);
5064 const char *return_type_name
;
5065 const glsl_type
*return_type
=
5066 this->return_type
->glsl_type(& return_type_name
, state
);
5069 YYLTYPE loc
= this->get_location();
5070 _mesa_glsl_error(&loc
, state
,
5071 "function `%s' has undeclared return type `%s'",
5072 name
, return_type_name
);
5073 return_type
= glsl_type::error_type
;
5076 /* ARB_shader_subroutine states:
5077 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5078 * subroutine(...) to a function declaration."
5080 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5081 YYLTYPE loc
= this->get_location();
5082 _mesa_glsl_error(&loc
, state
,
5083 "function declaration `%s' cannot have subroutine prepended",
5087 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5088 * "No qualifier is allowed on the return type of a function."
5090 if (this->return_type
->has_qualifiers(state
)) {
5091 YYLTYPE loc
= this->get_location();
5092 _mesa_glsl_error(& loc
, state
,
5093 "function `%s' return type has qualifiers", name
);
5096 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5098 * "Arrays are allowed as arguments and as the return type. In both
5099 * cases, the array must be explicitly sized."
5101 if (return_type
->is_unsized_array()) {
5102 YYLTYPE loc
= this->get_location();
5103 _mesa_glsl_error(& loc
, state
,
5104 "function `%s' return type array must be explicitly "
5108 /* From section 4.1.7 of the GLSL 4.40 spec:
5110 * "[Opaque types] can only be declared as function parameters
5111 * or uniform-qualified variables."
5113 if (return_type
->contains_opaque()) {
5114 YYLTYPE loc
= this->get_location();
5115 _mesa_glsl_error(&loc
, state
,
5116 "function `%s' return type can't contain an opaque type",
5120 /* Create an ir_function if one doesn't already exist. */
5121 f
= state
->symbols
->get_function(name
);
5123 f
= new(ctx
) ir_function(name
);
5124 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5125 if (!state
->symbols
->add_function(f
)) {
5126 /* This function name shadows a non-function use of the same name. */
5127 YYLTYPE loc
= this->get_location();
5128 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5129 "non-function", name
);
5133 emit_function(state
, f
);
5136 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5138 * "A shader cannot redefine or overload built-in functions."
5140 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5142 * "User code can overload the built-in functions but cannot redefine
5145 if (state
->es_shader
&& state
->language_version
>= 300) {
5146 /* Local shader has no exact candidates; check the built-ins. */
5147 _mesa_glsl_initialize_builtin_functions();
5148 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5149 YYLTYPE loc
= this->get_location();
5150 _mesa_glsl_error(& loc
, state
,
5151 "A shader cannot redefine or overload built-in "
5152 "function `%s' in GLSL ES 3.00", name
);
5157 /* Verify that this function's signature either doesn't match a previously
5158 * seen signature for a function with the same name, or, if a match is found,
5159 * that the previously seen signature does not have an associated definition.
5161 if (state
->es_shader
|| f
->has_user_signature()) {
5162 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5164 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5165 if (badvar
!= NULL
) {
5166 YYLTYPE loc
= this->get_location();
5168 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5169 "qualifiers don't match prototype", name
, badvar
);
5172 if (sig
->return_type
!= return_type
) {
5173 YYLTYPE loc
= this->get_location();
5175 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5176 "match prototype", name
);
5179 if (sig
->is_defined
) {
5180 if (is_definition
) {
5181 YYLTYPE loc
= this->get_location();
5182 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5184 /* We just encountered a prototype that exactly matches a
5185 * function that's already been defined. This is redundant,
5186 * and we should ignore it.
5194 /* Verify the return type of main() */
5195 if (strcmp(name
, "main") == 0) {
5196 if (! return_type
->is_void()) {
5197 YYLTYPE loc
= this->get_location();
5199 _mesa_glsl_error(& loc
, state
, "main() must return void");
5202 if (!hir_parameters
.is_empty()) {
5203 YYLTYPE loc
= this->get_location();
5205 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5209 /* Finish storing the information about this new function in its signature.
5212 sig
= new(ctx
) ir_function_signature(return_type
);
5213 f
->add_signature(sig
);
5216 sig
->replace_parameters(&hir_parameters
);
5219 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5222 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5223 unsigned qual_index
;
5224 if (process_qualifier_constant(state
, &loc
, "index",
5225 this->return_type
->qualifier
.index
,
5227 if (!state
->has_explicit_uniform_location()) {
5228 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5229 "GL_ARB_explicit_uniform_location or "
5231 } else if (qual_index
>= MAX_SUBROUTINES
) {
5232 _mesa_glsl_error(&loc
, state
,
5233 "invalid subroutine index (%d) index must "
5234 "be a number between 0 and "
5235 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5236 MAX_SUBROUTINES
- 1);
5238 f
->subroutine_index
= qual_index
;
5243 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5244 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5245 f
->num_subroutine_types
);
5247 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5248 const struct glsl_type
*type
;
5249 /* the subroutine type must be already declared */
5250 type
= state
->symbols
->get_type(decl
->identifier
);
5252 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5254 f
->subroutine_types
[idx
++] = type
;
5256 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5258 state
->num_subroutines
+ 1);
5259 state
->subroutines
[state
->num_subroutines
] = f
;
5260 state
->num_subroutines
++;
5264 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5265 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5266 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5269 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5271 state
->num_subroutine_types
+ 1);
5272 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5273 state
->num_subroutine_types
++;
5275 f
->is_subroutine
= true;
5278 /* Function declarations (prototypes) do not have r-values.
5285 ast_function_definition::hir(exec_list
*instructions
,
5286 struct _mesa_glsl_parse_state
*state
)
5288 prototype
->is_definition
= true;
5289 prototype
->hir(instructions
, state
);
5291 ir_function_signature
*signature
= prototype
->signature
;
5292 if (signature
== NULL
)
5295 assert(state
->current_function
== NULL
);
5296 state
->current_function
= signature
;
5297 state
->found_return
= false;
5299 /* Duplicate parameters declared in the prototype as concrete variables.
5300 * Add these to the symbol table.
5302 state
->symbols
->push_scope();
5303 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5304 assert(var
->as_variable() != NULL
);
5306 /* The only way a parameter would "exist" is if two parameters have
5309 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5310 YYLTYPE loc
= this->get_location();
5312 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5314 state
->symbols
->add_variable(var
);
5318 /* Convert the body of the function to HIR. */
5319 this->body
->hir(&signature
->body
, state
);
5320 signature
->is_defined
= true;
5322 state
->symbols
->pop_scope();
5324 assert(state
->current_function
== signature
);
5325 state
->current_function
= NULL
;
5327 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5328 YYLTYPE loc
= this->get_location();
5329 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5330 "%s, but no return statement",
5331 signature
->function_name(),
5332 signature
->return_type
->name
);
5335 /* Function definitions do not have r-values.
5342 ast_jump_statement::hir(exec_list
*instructions
,
5343 struct _mesa_glsl_parse_state
*state
)
5350 assert(state
->current_function
);
5352 if (opt_return_value
) {
5353 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5355 /* The value of the return type can be NULL if the shader says
5356 * 'return foo();' and foo() is a function that returns void.
5358 * NOTE: The GLSL spec doesn't say that this is an error. The type
5359 * of the return value is void. If the return type of the function is
5360 * also void, then this should compile without error. Seriously.
5362 const glsl_type
*const ret_type
=
5363 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5365 /* Implicit conversions are not allowed for return values prior to
5366 * ARB_shading_language_420pack.
5368 if (state
->current_function
->return_type
!= ret_type
) {
5369 YYLTYPE loc
= this->get_location();
5371 if (state
->has_420pack()) {
5372 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5374 _mesa_glsl_error(& loc
, state
,
5375 "could not implicitly convert return value "
5376 "to %s, in function `%s'",
5377 state
->current_function
->return_type
->name
,
5378 state
->current_function
->function_name());
5381 _mesa_glsl_error(& loc
, state
,
5382 "`return' with wrong type %s, in function `%s' "
5385 state
->current_function
->function_name(),
5386 state
->current_function
->return_type
->name
);
5388 } else if (state
->current_function
->return_type
->base_type
==
5390 YYLTYPE loc
= this->get_location();
5392 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5393 * specs add a clarification:
5395 * "A void function can only use return without a return argument, even if
5396 * the return argument has void type. Return statements only accept values:
5399 * void func2() { return func1(); } // illegal return statement"
5401 _mesa_glsl_error(& loc
, state
,
5402 "void functions can only use `return' without a "
5406 inst
= new(ctx
) ir_return(ret
);
5408 if (state
->current_function
->return_type
->base_type
!=
5410 YYLTYPE loc
= this->get_location();
5412 _mesa_glsl_error(& loc
, state
,
5413 "`return' with no value, in function %s returning "
5415 state
->current_function
->function_name());
5417 inst
= new(ctx
) ir_return
;
5420 state
->found_return
= true;
5421 instructions
->push_tail(inst
);
5426 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5427 YYLTYPE loc
= this->get_location();
5429 _mesa_glsl_error(& loc
, state
,
5430 "`discard' may only appear in a fragment shader");
5432 instructions
->push_tail(new(ctx
) ir_discard
);
5437 if (mode
== ast_continue
&&
5438 state
->loop_nesting_ast
== NULL
) {
5439 YYLTYPE loc
= this->get_location();
5441 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5442 } else if (mode
== ast_break
&&
5443 state
->loop_nesting_ast
== NULL
&&
5444 state
->switch_state
.switch_nesting_ast
== NULL
) {
5445 YYLTYPE loc
= this->get_location();
5447 _mesa_glsl_error(& loc
, state
,
5448 "break may only appear in a loop or a switch");
5450 /* For a loop, inline the for loop expression again, since we don't
5451 * know where near the end of the loop body the normal copy of it is
5452 * going to be placed. Same goes for the condition for a do-while
5455 if (state
->loop_nesting_ast
!= NULL
&&
5456 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5457 if (state
->loop_nesting_ast
->rest_expression
) {
5458 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5461 if (state
->loop_nesting_ast
->mode
==
5462 ast_iteration_statement::ast_do_while
) {
5463 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5467 if (state
->switch_state
.is_switch_innermost
&&
5468 mode
== ast_continue
) {
5469 /* Set 'continue_inside' to true. */
5470 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5471 ir_dereference_variable
*deref_continue_inside_var
=
5472 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5473 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5476 /* Break out from the switch, continue for the loop will
5477 * be called right after switch. */
5478 ir_loop_jump
*const jump
=
5479 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5480 instructions
->push_tail(jump
);
5482 } else if (state
->switch_state
.is_switch_innermost
&&
5483 mode
== ast_break
) {
5484 /* Force break out of switch by inserting a break. */
5485 ir_loop_jump
*const jump
=
5486 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5487 instructions
->push_tail(jump
);
5489 ir_loop_jump
*const jump
=
5490 new(ctx
) ir_loop_jump((mode
== ast_break
)
5491 ? ir_loop_jump::jump_break
5492 : ir_loop_jump::jump_continue
);
5493 instructions
->push_tail(jump
);
5500 /* Jump instructions do not have r-values.
5507 ast_selection_statement::hir(exec_list
*instructions
,
5508 struct _mesa_glsl_parse_state
*state
)
5512 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5514 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5516 * "Any expression whose type evaluates to a Boolean can be used as the
5517 * conditional expression bool-expression. Vector types are not accepted
5518 * as the expression to if."
5520 * The checks are separated so that higher quality diagnostics can be
5521 * generated for cases where both rules are violated.
5523 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5524 YYLTYPE loc
= this->condition
->get_location();
5526 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5530 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5532 if (then_statement
!= NULL
) {
5533 state
->symbols
->push_scope();
5534 then_statement
->hir(& stmt
->then_instructions
, state
);
5535 state
->symbols
->pop_scope();
5538 if (else_statement
!= NULL
) {
5539 state
->symbols
->push_scope();
5540 else_statement
->hir(& stmt
->else_instructions
, state
);
5541 state
->symbols
->pop_scope();
5544 instructions
->push_tail(stmt
);
5546 /* if-statements do not have r-values.
5553 ast_switch_statement::hir(exec_list
*instructions
,
5554 struct _mesa_glsl_parse_state
*state
)
5558 ir_rvalue
*const test_expression
=
5559 this->test_expression
->hir(instructions
, state
);
5561 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5563 * "The type of init-expression in a switch statement must be a
5566 if (!test_expression
->type
->is_scalar() ||
5567 !test_expression
->type
->is_integer()) {
5568 YYLTYPE loc
= this->test_expression
->get_location();
5570 _mesa_glsl_error(& loc
,
5572 "switch-statement expression must be scalar "
5576 /* Track the switch-statement nesting in a stack-like manner.
5578 struct glsl_switch_state saved
= state
->switch_state
;
5580 state
->switch_state
.is_switch_innermost
= true;
5581 state
->switch_state
.switch_nesting_ast
= this;
5582 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5583 hash_table_pointer_compare
);
5584 state
->switch_state
.previous_default
= NULL
;
5586 /* Initalize is_fallthru state to false.
5588 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5589 state
->switch_state
.is_fallthru_var
=
5590 new(ctx
) ir_variable(glsl_type::bool_type
,
5591 "switch_is_fallthru_tmp",
5593 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5595 ir_dereference_variable
*deref_is_fallthru_var
=
5596 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5597 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5600 /* Initialize continue_inside state to false.
5602 state
->switch_state
.continue_inside
=
5603 new(ctx
) ir_variable(glsl_type::bool_type
,
5604 "continue_inside_tmp",
5606 instructions
->push_tail(state
->switch_state
.continue_inside
);
5608 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5609 ir_dereference_variable
*deref_continue_inside_var
=
5610 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5611 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5614 state
->switch_state
.run_default
=
5615 new(ctx
) ir_variable(glsl_type::bool_type
,
5618 instructions
->push_tail(state
->switch_state
.run_default
);
5620 /* Loop around the switch is used for flow control. */
5621 ir_loop
* loop
= new(ctx
) ir_loop();
5622 instructions
->push_tail(loop
);
5624 /* Cache test expression.
5626 test_to_hir(&loop
->body_instructions
, state
);
5628 /* Emit code for body of switch stmt.
5630 body
->hir(&loop
->body_instructions
, state
);
5632 /* Insert a break at the end to exit loop. */
5633 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5634 loop
->body_instructions
.push_tail(jump
);
5636 /* If we are inside loop, check if continue got called inside switch. */
5637 if (state
->loop_nesting_ast
!= NULL
) {
5638 ir_dereference_variable
*deref_continue_inside
=
5639 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5640 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5641 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5643 if (state
->loop_nesting_ast
!= NULL
) {
5644 if (state
->loop_nesting_ast
->rest_expression
) {
5645 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5648 if (state
->loop_nesting_ast
->mode
==
5649 ast_iteration_statement::ast_do_while
) {
5650 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5653 irif
->then_instructions
.push_tail(jump
);
5654 instructions
->push_tail(irif
);
5657 hash_table_dtor(state
->switch_state
.labels_ht
);
5659 state
->switch_state
= saved
;
5661 /* Switch statements do not have r-values. */
5667 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5668 struct _mesa_glsl_parse_state
*state
)
5672 /* Cache value of test expression. */
5673 ir_rvalue
*const test_val
=
5674 test_expression
->hir(instructions
,
5677 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5680 ir_dereference_variable
*deref_test_var
=
5681 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5683 instructions
->push_tail(state
->switch_state
.test_var
);
5684 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5689 ast_switch_body::hir(exec_list
*instructions
,
5690 struct _mesa_glsl_parse_state
*state
)
5693 stmts
->hir(instructions
, state
);
5695 /* Switch bodies do not have r-values. */
5700 ast_case_statement_list::hir(exec_list
*instructions
,
5701 struct _mesa_glsl_parse_state
*state
)
5703 exec_list default_case
, after_default
, tmp
;
5705 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5706 case_stmt
->hir(&tmp
, state
);
5709 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5710 default_case
.append_list(&tmp
);
5714 /* If default case found, append 'after_default' list. */
5715 if (!default_case
.is_empty())
5716 after_default
.append_list(&tmp
);
5718 instructions
->append_list(&tmp
);
5721 /* Handle the default case. This is done here because default might not be
5722 * the last case. We need to add checks against following cases first to see
5723 * if default should be chosen or not.
5725 if (!default_case
.is_empty()) {
5727 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5728 ir_dereference_variable
*deref_run_default_var
=
5729 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5731 /* Choose to run default case initially, following conditional
5732 * assignments might change this.
5734 ir_assignment
*const init_var
=
5735 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5736 instructions
->push_tail(init_var
);
5738 /* Default case was the last one, no checks required. */
5739 if (after_default
.is_empty()) {
5740 instructions
->append_list(&default_case
);
5744 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5745 ir_assignment
*assign
= ir
->as_assignment();
5750 /* Clone the check between case label and init expression. */
5751 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5752 ir_expression
*clone
= exp
->clone(state
, NULL
);
5754 ir_dereference_variable
*deref_var
=
5755 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5756 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5758 ir_assignment
*const set_false
=
5759 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5761 instructions
->push_tail(set_false
);
5764 /* Append default case and all cases after it. */
5765 instructions
->append_list(&default_case
);
5766 instructions
->append_list(&after_default
);
5769 /* Case statements do not have r-values. */
5774 ast_case_statement::hir(exec_list
*instructions
,
5775 struct _mesa_glsl_parse_state
*state
)
5777 labels
->hir(instructions
, state
);
5779 /* Guard case statements depending on fallthru state. */
5780 ir_dereference_variable
*const deref_fallthru_guard
=
5781 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5782 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5784 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5785 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5787 instructions
->push_tail(test_fallthru
);
5789 /* Case statements do not have r-values. */
5795 ast_case_label_list::hir(exec_list
*instructions
,
5796 struct _mesa_glsl_parse_state
*state
)
5798 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5799 label
->hir(instructions
, state
);
5801 /* Case labels do not have r-values. */
5806 ast_case_label::hir(exec_list
*instructions
,
5807 struct _mesa_glsl_parse_state
*state
)
5811 ir_dereference_variable
*deref_fallthru_var
=
5812 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5814 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5816 /* If not default case, ... */
5817 if (this->test_value
!= NULL
) {
5818 /* Conditionally set fallthru state based on
5819 * comparison of cached test expression value to case label.
5821 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5822 ir_constant
*label_const
= label_rval
->constant_expression_value();
5825 YYLTYPE loc
= this->test_value
->get_location();
5827 _mesa_glsl_error(& loc
, state
,
5828 "switch statement case label must be a "
5829 "constant expression");
5831 /* Stuff a dummy value in to allow processing to continue. */
5832 label_const
= new(ctx
) ir_constant(0);
5834 ast_expression
*previous_label
= (ast_expression
*)
5835 hash_table_find(state
->switch_state
.labels_ht
,
5836 (void *)(uintptr_t)label_const
->value
.u
[0]);
5838 if (previous_label
) {
5839 YYLTYPE loc
= this->test_value
->get_location();
5840 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5842 loc
= previous_label
->get_location();
5843 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5845 hash_table_insert(state
->switch_state
.labels_ht
,
5847 (void *)(uintptr_t)label_const
->value
.u
[0]);
5851 ir_dereference_variable
*deref_test_var
=
5852 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5854 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5859 * From GLSL 4.40 specification section 6.2 ("Selection"):
5861 * "The type of the init-expression value in a switch statement must
5862 * be a scalar int or uint. The type of the constant-expression value
5863 * in a case label also must be a scalar int or uint. When any pair
5864 * of these values is tested for "equal value" and the types do not
5865 * match, an implicit conversion will be done to convert the int to a
5866 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5869 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5870 YYLTYPE loc
= this->test_value
->get_location();
5872 const glsl_type
*type_a
= label_const
->type
;
5873 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5875 /* Check if int->uint implicit conversion is supported. */
5876 bool integer_conversion_supported
=
5877 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5880 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5881 !integer_conversion_supported
) {
5882 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
5883 "init-expression and case label (%s != %s)",
5884 type_a
->name
, type_b
->name
);
5886 /* Conversion of the case label. */
5887 if (type_a
->base_type
== GLSL_TYPE_INT
) {
5888 if (!apply_implicit_conversion(glsl_type::uint_type
,
5889 test_cond
->operands
[0], state
))
5890 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5892 /* Conversion of the init-expression value. */
5893 if (!apply_implicit_conversion(glsl_type::uint_type
,
5894 test_cond
->operands
[1], state
))
5895 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5900 ir_assignment
*set_fallthru_on_test
=
5901 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5903 instructions
->push_tail(set_fallthru_on_test
);
5904 } else { /* default case */
5905 if (state
->switch_state
.previous_default
) {
5906 YYLTYPE loc
= this->get_location();
5907 _mesa_glsl_error(& loc
, state
,
5908 "multiple default labels in one switch");
5910 loc
= state
->switch_state
.previous_default
->get_location();
5911 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5913 state
->switch_state
.previous_default
= this;
5915 /* Set fallthru condition on 'run_default' bool. */
5916 ir_dereference_variable
*deref_run_default
=
5917 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5918 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5919 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5923 /* Set falltrhu state. */
5924 ir_assignment
*set_fallthru
=
5925 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5927 instructions
->push_tail(set_fallthru
);
5930 /* Case statements do not have r-values. */
5935 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
5936 struct _mesa_glsl_parse_state
*state
)
5940 if (condition
!= NULL
) {
5941 ir_rvalue
*const cond
=
5942 condition
->hir(instructions
, state
);
5945 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
5946 YYLTYPE loc
= condition
->get_location();
5948 _mesa_glsl_error(& loc
, state
,
5949 "loop condition must be scalar boolean");
5951 /* As the first code in the loop body, generate a block that looks
5952 * like 'if (!condition) break;' as the loop termination condition.
5954 ir_rvalue
*const not_cond
=
5955 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
5957 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
5959 ir_jump
*const break_stmt
=
5960 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5962 if_stmt
->then_instructions
.push_tail(break_stmt
);
5963 instructions
->push_tail(if_stmt
);
5970 ast_iteration_statement::hir(exec_list
*instructions
,
5971 struct _mesa_glsl_parse_state
*state
)
5975 /* For-loops and while-loops start a new scope, but do-while loops do not.
5977 if (mode
!= ast_do_while
)
5978 state
->symbols
->push_scope();
5980 if (init_statement
!= NULL
)
5981 init_statement
->hir(instructions
, state
);
5983 ir_loop
*const stmt
= new(ctx
) ir_loop();
5984 instructions
->push_tail(stmt
);
5986 /* Track the current loop nesting. */
5987 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
5989 state
->loop_nesting_ast
= this;
5991 /* Likewise, indicate that following code is closest to a loop,
5992 * NOT closest to a switch.
5994 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
5995 state
->switch_state
.is_switch_innermost
= false;
5997 if (mode
!= ast_do_while
)
5998 condition_to_hir(&stmt
->body_instructions
, state
);
6001 body
->hir(& stmt
->body_instructions
, state
);
6003 if (rest_expression
!= NULL
)
6004 rest_expression
->hir(& stmt
->body_instructions
, state
);
6006 if (mode
== ast_do_while
)
6007 condition_to_hir(&stmt
->body_instructions
, state
);
6009 if (mode
!= ast_do_while
)
6010 state
->symbols
->pop_scope();
6012 /* Restore previous nesting before returning. */
6013 state
->loop_nesting_ast
= nesting_ast
;
6014 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6016 /* Loops do not have r-values.
6023 * Determine if the given type is valid for establishing a default precision
6026 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6028 * "The precision statement
6030 * precision precision-qualifier type;
6032 * can be used to establish a default precision qualifier. The type field
6033 * can be either int or float or any of the sampler types, and the
6034 * precision-qualifier can be lowp, mediump, or highp."
6036 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6037 * qualifiers on sampler types, but this seems like an oversight (since the
6038 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6039 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6043 is_valid_default_precision_type(const struct glsl_type
*const type
)
6048 switch (type
->base_type
) {
6050 case GLSL_TYPE_FLOAT
:
6051 /* "int" and "float" are valid, but vectors and matrices are not. */
6052 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6053 case GLSL_TYPE_SAMPLER
:
6054 case GLSL_TYPE_IMAGE
:
6055 case GLSL_TYPE_ATOMIC_UINT
:
6064 ast_type_specifier::hir(exec_list
*instructions
,
6065 struct _mesa_glsl_parse_state
*state
)
6067 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6070 YYLTYPE loc
= this->get_location();
6072 /* If this is a precision statement, check that the type to which it is
6073 * applied is either float or int.
6075 * From section 4.5.3 of the GLSL 1.30 spec:
6076 * "The precision statement
6077 * precision precision-qualifier type;
6078 * can be used to establish a default precision qualifier. The type
6079 * field can be either int or float [...]. Any other types or
6080 * qualifiers will result in an error.
6082 if (this->default_precision
!= ast_precision_none
) {
6083 if (!state
->check_precision_qualifiers_allowed(&loc
))
6086 if (this->structure
!= NULL
) {
6087 _mesa_glsl_error(&loc
, state
,
6088 "precision qualifiers do not apply to structures");
6092 if (this->array_specifier
!= NULL
) {
6093 _mesa_glsl_error(&loc
, state
,
6094 "default precision statements do not apply to "
6099 const struct glsl_type
*const type
=
6100 state
->symbols
->get_type(this->type_name
);
6101 if (!is_valid_default_precision_type(type
)) {
6102 _mesa_glsl_error(&loc
, state
,
6103 "default precision statements apply only to "
6104 "float, int, and opaque types");
6108 if (state
->es_shader
) {
6109 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6112 * "Non-precision qualified declarations will use the precision
6113 * qualifier specified in the most recent precision statement
6114 * that is still in scope. The precision statement has the same
6115 * scoping rules as variable declarations. If it is declared
6116 * inside a compound statement, its effect stops at the end of
6117 * the innermost statement it was declared in. Precision
6118 * statements in nested scopes override precision statements in
6119 * outer scopes. Multiple precision statements for the same basic
6120 * type can appear inside the same scope, with later statements
6121 * overriding earlier statements within that scope."
6123 * Default precision specifications follow the same scope rules as
6124 * variables. So, we can track the state of the default precision
6125 * qualifiers in the symbol table, and the rules will just work. This
6126 * is a slight abuse of the symbol table, but it has the semantics
6129 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6130 this->default_precision
);
6133 /* FINISHME: Translate precision statements into IR. */
6137 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6138 * process_record_constructor() can do type-checking on C-style initializer
6139 * expressions of structs, but ast_struct_specifier should only be translated
6140 * to HIR if it is declaring the type of a structure.
6142 * The ->is_declaration field is false for initializers of variables
6143 * declared separately from the struct's type definition.
6145 * struct S { ... }; (is_declaration = true)
6146 * struct T { ... } t = { ... }; (is_declaration = true)
6147 * S s = { ... }; (is_declaration = false)
6149 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6150 return this->structure
->hir(instructions
, state
);
6157 * Process a structure or interface block tree into an array of structure fields
6159 * After parsing, where there are some syntax differnces, structures and
6160 * interface blocks are almost identical. They are similar enough that the
6161 * AST for each can be processed the same way into a set of
6162 * \c glsl_struct_field to describe the members.
6164 * If we're processing an interface block, var_mode should be the type of the
6165 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6166 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6170 * The number of fields processed. A pointer to the array structure fields is
6171 * stored in \c *fields_ret.
6174 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6175 struct _mesa_glsl_parse_state
*state
,
6176 exec_list
*declarations
,
6177 glsl_struct_field
**fields_ret
,
6179 enum glsl_matrix_layout matrix_layout
,
6180 bool allow_reserved_names
,
6181 ir_variable_mode var_mode
,
6182 ast_type_qualifier
*layout
,
6183 unsigned block_stream
)
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
,
6205 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6206 const char *type_name
;
6207 YYLTYPE loc
= decl_list
->get_location();
6209 decl_list
->type
->specifier
->hir(instructions
, state
);
6211 /* Section 10.9 of the GLSL ES 1.00 specification states that
6212 * embedded structure definitions have been removed from the language.
6214 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
6215 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
6216 "not allowed in GLSL ES 1.00");
6219 const glsl_type
*decl_type
=
6220 decl_list
->type
->glsl_type(& type_name
, state
);
6222 const struct ast_type_qualifier
*const qual
=
6223 &decl_list
->type
->qualifier
;
6225 /* From section 4.3.9 of the GLSL 4.40 spec:
6227 * "[In interface blocks] opaque types are not allowed."
6229 * It should be impossible for decl_type to be NULL here. Cases that
6230 * might naturally lead to decl_type being NULL, especially for the
6231 * is_interface case, will have resulted in compilation having
6232 * already halted due to a syntax error.
6236 if (is_interface
&& decl_type
->contains_opaque()) {
6237 _mesa_glsl_error(&loc
, state
,
6238 "uniform/buffer in non-default interface block contains "
6242 if (decl_type
->contains_atomic()) {
6243 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6245 * "Members of structures cannot be declared as atomic counter
6248 _mesa_glsl_error(&loc
, state
, "atomic counter in structure, "
6249 "shader storage block or uniform block");
6252 if (decl_type
->contains_image()) {
6253 /* FINISHME: Same problem as with atomic counters.
6254 * FINISHME: Request clarification from Khronos and add
6255 * FINISHME: spec quotation here.
6257 _mesa_glsl_error(&loc
, state
,
6258 "image in structure, shader storage block or "
6262 if (qual
->flags
.q
.explicit_binding
) {
6263 _mesa_glsl_error(&loc
, state
,
6264 "binding layout qualifier cannot be applied "
6265 "to struct or interface block members");
6268 if (qual
->flags
.q
.std140
||
6269 qual
->flags
.q
.std430
||
6270 qual
->flags
.q
.packed
||
6271 qual
->flags
.q
.shared
) {
6272 _mesa_glsl_error(&loc
, state
,
6273 "uniform/shader storage block layout qualifiers "
6274 "std140, std430, packed, and shared can only be "
6275 "applied to uniform/shader storage blocks, not "
6279 if (qual
->flags
.q
.constant
) {
6280 _mesa_glsl_error(&loc
, state
,
6281 "const storage qualifier cannot be applied "
6282 "to struct or interface block members");
6285 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6287 * "A block member may be declared with a stream identifier, but
6288 * the specified stream must match the stream associated with the
6289 * containing block."
6291 if (qual
->flags
.q
.explicit_stream
) {
6292 unsigned qual_stream
;
6293 if (process_qualifier_constant(state
, &loc
, "stream",
6294 qual
->stream
, &qual_stream
) &&
6295 qual_stream
!= block_stream
) {
6296 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6297 "interface block member does not match "
6298 "the interface block (%d vs %d)", qual
->stream
,
6303 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6304 _mesa_glsl_error(&loc
, state
,
6305 "interpolation qualifiers cannot be used "
6306 "with uniform interface blocks");
6309 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6310 qual
->has_auxiliary_storage()) {
6311 _mesa_glsl_error(&loc
, state
,
6312 "auxiliary storage qualifiers cannot be used "
6313 "in uniform blocks or structures.");
6316 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6317 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6318 _mesa_glsl_error(&loc
, state
,
6319 "row_major and column_major can only be "
6320 "applied to interface blocks");
6322 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6325 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6326 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6327 "readonly and writeonly.");
6330 foreach_list_typed (ast_declaration
, decl
, link
,
6331 &decl_list
->declarations
) {
6332 YYLTYPE loc
= decl
->get_location();
6334 if (!allow_reserved_names
)
6335 validate_identifier(decl
->identifier
, loc
, state
);
6337 const struct glsl_type
*field_type
=
6338 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6339 validate_array_dimensions(field_type
, state
, &loc
);
6340 fields
[i
].type
= field_type
;
6341 fields
[i
].name
= decl
->identifier
;
6342 fields
[i
].location
= -1;
6343 fields
[i
].interpolation
=
6344 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
6345 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6346 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6347 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6348 fields
[i
].precision
= qual
->precision
;
6350 /* Propogate row- / column-major information down the fields of the
6351 * structure or interface block. Structures need this data because
6352 * the structure may contain a structure that contains ... a matrix
6353 * that need the proper layout.
6355 if (field_type
->without_array()->is_matrix()
6356 || field_type
->without_array()->is_record()) {
6357 /* If no layout is specified for the field, inherit the layout
6360 fields
[i
].matrix_layout
= matrix_layout
;
6362 if (qual
->flags
.q
.row_major
)
6363 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6364 else if (qual
->flags
.q
.column_major
)
6365 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6367 /* If we're processing an interface block, the matrix layout must
6368 * be decided by this point.
6370 assert(!is_interface
6371 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6372 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6375 /* Image qualifiers are allowed on buffer variables, which can only
6376 * be defined inside shader storage buffer objects
6378 if (layout
&& var_mode
== ir_var_shader_storage
) {
6379 /* For readonly and writeonly qualifiers the field definition,
6380 * if set, overwrites the layout qualifier.
6382 if (qual
->flags
.q
.read_only
) {
6383 fields
[i
].image_read_only
= true;
6384 fields
[i
].image_write_only
= false;
6385 } else if (qual
->flags
.q
.write_only
) {
6386 fields
[i
].image_read_only
= false;
6387 fields
[i
].image_write_only
= true;
6389 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6390 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6393 /* For other qualifiers, we set the flag if either the layout
6394 * qualifier or the field qualifier are set
6396 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6397 layout
->flags
.q
.coherent
;
6398 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6399 layout
->flags
.q
._volatile
;
6400 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6401 layout
->flags
.q
.restrict_flag
;
6408 assert(i
== decl_count
);
6410 *fields_ret
= fields
;
6416 ast_struct_specifier::hir(exec_list
*instructions
,
6417 struct _mesa_glsl_parse_state
*state
)
6419 YYLTYPE loc
= this->get_location();
6421 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6423 * "Anonymous structures are not supported; so embedded structures must
6424 * have a declarator. A name given to an embedded struct is scoped at
6425 * the same level as the struct it is embedded in."
6427 * The same section of the GLSL 1.20 spec says:
6429 * "Anonymous structures are not supported. Embedded structures are not
6432 * struct S { float f; };
6434 * S; // Error: anonymous structures disallowed
6435 * struct { ... }; // Error: embedded structures disallowed
6436 * S s; // Okay: nested structures with name are allowed
6439 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
6440 * we allow embedded structures in 1.10 only.
6442 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
6443 _mesa_glsl_error(&loc
, state
,
6444 "embedded structure declarations are not allowed");
6446 state
->struct_specifier_depth
++;
6448 glsl_struct_field
*fields
;
6449 unsigned decl_count
=
6450 ast_process_struct_or_iface_block_members(instructions
,
6452 &this->declarations
,
6455 GLSL_MATRIX_LAYOUT_INHERITED
,
6456 false /* allow_reserved_names */,
6459 0 /* for interface only */);
6461 validate_identifier(this->name
, loc
, state
);
6463 const glsl_type
*t
=
6464 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6466 if (!state
->symbols
->add_type(name
, t
)) {
6467 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6469 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6471 state
->num_user_structures
+ 1);
6473 s
[state
->num_user_structures
] = t
;
6474 state
->user_structures
= s
;
6475 state
->num_user_structures
++;
6479 state
->struct_specifier_depth
--;
6481 /* Structure type definitions do not have r-values.
6488 * Visitor class which detects whether a given interface block has been used.
6490 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6493 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6494 : mode(mode
), block(block
), found(false)
6498 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6500 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6504 return visit_continue
;
6507 bool usage_found() const
6513 ir_variable_mode mode
;
6514 const glsl_type
*block
;
6519 is_unsized_array_last_element(ir_variable
*v
)
6521 const glsl_type
*interface_type
= v
->get_interface_type();
6522 int length
= interface_type
->length
;
6524 assert(v
->type
->is_unsized_array());
6526 /* Check if it is the last element of the interface */
6527 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6533 ast_interface_block::hir(exec_list
*instructions
,
6534 struct _mesa_glsl_parse_state
*state
)
6536 YYLTYPE loc
= this->get_location();
6538 /* Interface blocks must be declared at global scope */
6539 if (state
->current_function
!= NULL
) {
6540 _mesa_glsl_error(&loc
, state
,
6541 "Interface block `%s' must be declared "
6546 if (!this->layout
.flags
.q
.buffer
&&
6547 this->layout
.flags
.q
.std430
) {
6548 _mesa_glsl_error(&loc
, state
,
6549 "std430 storage block layout qualifier is supported "
6550 "only for shader storage blocks");
6553 /* The ast_interface_block has a list of ast_declarator_lists. We
6554 * need to turn those into ir_variables with an association
6555 * with this uniform block.
6557 enum glsl_interface_packing packing
;
6558 if (this->layout
.flags
.q
.shared
) {
6559 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6560 } else if (this->layout
.flags
.q
.packed
) {
6561 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6562 } else if (this->layout
.flags
.q
.std430
) {
6563 packing
= GLSL_INTERFACE_PACKING_STD430
;
6565 /* The default layout is std140.
6567 packing
= GLSL_INTERFACE_PACKING_STD140
;
6570 ir_variable_mode var_mode
;
6571 const char *iface_type_name
;
6572 if (this->layout
.flags
.q
.in
) {
6573 var_mode
= ir_var_shader_in
;
6574 iface_type_name
= "in";
6575 } else if (this->layout
.flags
.q
.out
) {
6576 var_mode
= ir_var_shader_out
;
6577 iface_type_name
= "out";
6578 } else if (this->layout
.flags
.q
.uniform
) {
6579 var_mode
= ir_var_uniform
;
6580 iface_type_name
= "uniform";
6581 } else if (this->layout
.flags
.q
.buffer
) {
6582 var_mode
= ir_var_shader_storage
;
6583 iface_type_name
= "buffer";
6585 var_mode
= ir_var_auto
;
6586 iface_type_name
= "UNKNOWN";
6587 assert(!"interface block layout qualifier not found!");
6590 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6591 if (this->layout
.flags
.q
.row_major
)
6592 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6593 else if (this->layout
.flags
.q
.column_major
)
6594 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6596 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6597 exec_list declared_variables
;
6598 glsl_struct_field
*fields
;
6600 /* Treat an interface block as one level of nesting, so that embedded struct
6601 * specifiers will be disallowed.
6603 state
->struct_specifier_depth
++;
6605 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
6606 * that we don't have incompatible qualifiers
6608 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
6609 _mesa_glsl_error(&loc
, state
,
6610 "Interface block sets both readonly and writeonly");
6613 unsigned qual_stream
;
6614 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
6616 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
6617 /* If the stream qualifier is invalid it doesn't make sense to continue
6618 * on and try to compare stream layouts on member variables against it
6619 * so just return early.
6624 unsigned int num_variables
=
6625 ast_process_struct_or_iface_block_members(&declared_variables
,
6627 &this->declarations
,
6631 redeclaring_per_vertex
,
6636 state
->struct_specifier_depth
--;
6638 if (!redeclaring_per_vertex
) {
6639 validate_identifier(this->block_name
, loc
, state
);
6641 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
6643 * "Block names have no other use within a shader beyond interface
6644 * matching; it is a compile-time error to use a block name at global
6645 * scope for anything other than as a block name."
6647 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
6648 if (var
&& !var
->type
->is_interface()) {
6649 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
6650 "already used in the scope.",
6655 const glsl_type
*earlier_per_vertex
= NULL
;
6656 if (redeclaring_per_vertex
) {
6657 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
6658 * the named interface block gl_in, we can find it by looking at the
6659 * previous declaration of gl_in. Otherwise we can find it by looking
6660 * at the previous decalartion of any of the built-in outputs,
6663 * Also check that the instance name and array-ness of the redeclaration
6667 case ir_var_shader_in
:
6668 if (ir_variable
*earlier_gl_in
=
6669 state
->symbols
->get_variable("gl_in")) {
6670 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6672 _mesa_glsl_error(&loc
, state
,
6673 "redeclaration of gl_PerVertex input not allowed "
6675 _mesa_shader_stage_to_string(state
->stage
));
6677 if (this->instance_name
== NULL
||
6678 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
6679 !this->array_specifier
->is_single_dimension()) {
6680 _mesa_glsl_error(&loc
, state
,
6681 "gl_PerVertex input must be redeclared as "
6685 case ir_var_shader_out
:
6686 if (ir_variable
*earlier_gl_Position
=
6687 state
->symbols
->get_variable("gl_Position")) {
6688 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6689 } else if (ir_variable
*earlier_gl_out
=
6690 state
->symbols
->get_variable("gl_out")) {
6691 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6693 _mesa_glsl_error(&loc
, state
,
6694 "redeclaration of gl_PerVertex output not "
6695 "allowed in the %s shader",
6696 _mesa_shader_stage_to_string(state
->stage
));
6698 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6699 if (this->instance_name
== NULL
||
6700 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6701 _mesa_glsl_error(&loc
, state
,
6702 "gl_PerVertex output must be redeclared as "
6706 if (this->instance_name
!= NULL
) {
6707 _mesa_glsl_error(&loc
, state
,
6708 "gl_PerVertex output may not be redeclared with "
6709 "an instance name");
6714 _mesa_glsl_error(&loc
, state
,
6715 "gl_PerVertex must be declared as an input or an "
6720 if (earlier_per_vertex
== NULL
) {
6721 /* An error has already been reported. Bail out to avoid null
6722 * dereferences later in this function.
6727 /* Copy locations from the old gl_PerVertex interface block. */
6728 for (unsigned i
= 0; i
< num_variables
; i
++) {
6729 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6731 _mesa_glsl_error(&loc
, state
,
6732 "redeclaration of gl_PerVertex must be a subset "
6733 "of the built-in members of gl_PerVertex");
6735 fields
[i
].location
=
6736 earlier_per_vertex
->fields
.structure
[j
].location
;
6737 fields
[i
].interpolation
=
6738 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6739 fields
[i
].centroid
=
6740 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6742 earlier_per_vertex
->fields
.structure
[j
].sample
;
6744 earlier_per_vertex
->fields
.structure
[j
].patch
;
6745 fields
[i
].precision
=
6746 earlier_per_vertex
->fields
.structure
[j
].precision
;
6750 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
6753 * If a built-in interface block is redeclared, it must appear in
6754 * the shader before any use of any member included in the built-in
6755 * declaration, or a compilation error will result.
6757 * This appears to be a clarification to the behaviour established for
6758 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
6759 * regardless of GLSL version.
6761 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
6762 v
.run(instructions
);
6763 if (v
.usage_found()) {
6764 _mesa_glsl_error(&loc
, state
,
6765 "redeclaration of a built-in interface block must "
6766 "appear before any use of any member of the "
6771 const glsl_type
*block_type
=
6772 glsl_type::get_interface_instance(fields
,
6777 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
6778 YYLTYPE loc
= this->get_location();
6779 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
6780 "already taken in the current scope",
6781 this->block_name
, iface_type_name
);
6784 /* Since interface blocks cannot contain statements, it should be
6785 * impossible for the block to generate any instructions.
6787 assert(declared_variables
.is_empty());
6789 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
6791 * Geometry shader input variables get the per-vertex values written
6792 * out by vertex shader output variables of the same names. Since a
6793 * geometry shader operates on a set of vertices, each input varying
6794 * variable (or input block, see interface blocks below) needs to be
6795 * declared as an array.
6797 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
6798 var_mode
== ir_var_shader_in
) {
6799 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
6800 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6801 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
6802 this->array_specifier
== NULL
&&
6803 var_mode
== ir_var_shader_in
) {
6804 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
6805 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
6806 this->array_specifier
== NULL
&&
6807 var_mode
== ir_var_shader_out
) {
6808 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
6812 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
6815 * "If an instance name (instance-name) is used, then it puts all the
6816 * members inside a scope within its own name space, accessed with the
6817 * field selector ( . ) operator (analogously to structures)."
6819 if (this->instance_name
) {
6820 if (redeclaring_per_vertex
) {
6821 /* When a built-in in an unnamed interface block is redeclared,
6822 * get_variable_being_redeclared() calls
6823 * check_builtin_array_max_size() to make sure that built-in array
6824 * variables aren't redeclared to illegal sizes. But we're looking
6825 * at a redeclaration of a named built-in interface block. So we
6826 * have to manually call check_builtin_array_max_size() for all parts
6827 * of the interface that are arrays.
6829 for (unsigned i
= 0; i
< num_variables
; i
++) {
6830 if (fields
[i
].type
->is_array()) {
6831 const unsigned size
= fields
[i
].type
->array_size();
6832 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
6836 validate_identifier(this->instance_name
, loc
, state
);
6841 if (this->array_specifier
!= NULL
) {
6842 const glsl_type
*block_array_type
=
6843 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
6845 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
6847 * For uniform blocks declared an array, each individual array
6848 * element corresponds to a separate buffer object backing one
6849 * instance of the block. As the array size indicates the number
6850 * of buffer objects needed, uniform block array declarations
6851 * must specify an array size.
6853 * And a few paragraphs later:
6855 * Geometry shader input blocks must be declared as arrays and
6856 * follow the array declaration and linking rules for all
6857 * geometry shader inputs. All other input and output block
6858 * arrays must specify an array size.
6860 * The same applies to tessellation shaders.
6862 * The upshot of this is that the only circumstance where an
6863 * interface array size *doesn't* need to be specified is on a
6864 * geometry shader input, tessellation control shader input,
6865 * tessellation control shader output, and tessellation evaluation
6868 if (block_array_type
->is_unsized_array()) {
6869 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
6870 state
->stage
== MESA_SHADER_TESS_CTRL
||
6871 state
->stage
== MESA_SHADER_TESS_EVAL
;
6872 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
6874 if (this->layout
.flags
.q
.in
) {
6876 _mesa_glsl_error(&loc
, state
,
6877 "unsized input block arrays not allowed in "
6879 _mesa_shader_stage_to_string(state
->stage
));
6880 } else if (this->layout
.flags
.q
.out
) {
6882 _mesa_glsl_error(&loc
, state
,
6883 "unsized output block arrays not allowed in "
6885 _mesa_shader_stage_to_string(state
->stage
));
6887 /* by elimination, this is a uniform block array */
6888 _mesa_glsl_error(&loc
, state
,
6889 "unsized uniform block arrays not allowed in "
6891 _mesa_shader_stage_to_string(state
->stage
));
6895 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
6897 * * Arrays of arrays of blocks are not allowed
6899 if (state
->es_shader
&& block_array_type
->is_array() &&
6900 block_array_type
->fields
.array
->is_array()) {
6901 _mesa_glsl_error(&loc
, state
,
6902 "arrays of arrays interface blocks are "
6906 var
= new(state
) ir_variable(block_array_type
,
6907 this->instance_name
,
6910 var
= new(state
) ir_variable(block_type
,
6911 this->instance_name
,
6915 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
6916 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
6918 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
6919 var
->data
.read_only
= true;
6921 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
6922 handle_geometry_shader_input_decl(state
, loc
, var
);
6923 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6924 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
6925 handle_tess_shader_input_decl(state
, loc
, var
);
6926 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
6927 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
6929 for (unsigned i
= 0; i
< num_variables
; i
++) {
6930 if (fields
[i
].type
->is_unsized_array()) {
6931 if (var_mode
== ir_var_shader_storage
) {
6932 if (i
!= (num_variables
- 1)) {
6933 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6934 "only last member of a shader storage block "
6935 "can be defined as unsized array",
6939 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
6941 * "If an array is declared as the last member of a shader storage
6942 * block and the size is not specified at compile-time, it is
6943 * sized at run-time. In all other cases, arrays are sized only
6946 if (state
->es_shader
) {
6947 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6948 "only last member of a shader storage block "
6949 "can be defined as unsized array",
6956 if (ir_variable
*earlier
=
6957 state
->symbols
->get_variable(this->instance_name
)) {
6958 if (!redeclaring_per_vertex
) {
6959 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
6960 this->instance_name
);
6962 earlier
->data
.how_declared
= ir_var_declared_normally
;
6963 earlier
->type
= var
->type
;
6964 earlier
->reinit_interface_type(block_type
);
6967 if (this->layout
.flags
.q
.explicit_binding
) {
6968 apply_explicit_binding(state
, &loc
, var
, var
->type
,
6972 var
->data
.stream
= qual_stream
;
6974 state
->symbols
->add_variable(var
);
6975 instructions
->push_tail(var
);
6978 /* In order to have an array size, the block must also be declared with
6981 assert(this->array_specifier
== NULL
);
6983 for (unsigned i
= 0; i
< num_variables
; i
++) {
6985 new(state
) ir_variable(fields
[i
].type
,
6986 ralloc_strdup(state
, fields
[i
].name
),
6988 var
->data
.interpolation
= fields
[i
].interpolation
;
6989 var
->data
.centroid
= fields
[i
].centroid
;
6990 var
->data
.sample
= fields
[i
].sample
;
6991 var
->data
.patch
= fields
[i
].patch
;
6992 var
->data
.stream
= qual_stream
;
6993 var
->init_interface_type(block_type
);
6995 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
6996 var
->data
.read_only
= true;
6998 /* Precision qualifiers do not have any meaning in Desktop GLSL */
6999 if (state
->es_shader
) {
7000 var
->data
.precision
=
7001 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7005 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7006 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7007 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7009 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7012 if (var
->data
.mode
== ir_var_shader_storage
) {
7013 var
->data
.image_read_only
= fields
[i
].image_read_only
;
7014 var
->data
.image_write_only
= fields
[i
].image_write_only
;
7015 var
->data
.image_coherent
= fields
[i
].image_coherent
;
7016 var
->data
.image_volatile
= fields
[i
].image_volatile
;
7017 var
->data
.image_restrict
= fields
[i
].image_restrict
;
7020 /* Examine var name here since var may get deleted in the next call */
7021 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7023 if (redeclaring_per_vertex
) {
7024 ir_variable
*earlier
=
7025 get_variable_being_redeclared(var
, loc
, state
,
7026 true /* allow_all_redeclarations */);
7027 if (!var_is_gl_id
|| earlier
== NULL
) {
7028 _mesa_glsl_error(&loc
, state
,
7029 "redeclaration of gl_PerVertex can only "
7030 "include built-in variables");
7031 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7032 _mesa_glsl_error(&loc
, state
,
7033 "`%s' has already been redeclared",
7036 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7037 earlier
->reinit_interface_type(block_type
);
7042 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7043 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7045 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7046 * The UBO declaration itself doesn't get an ir_variable unless it
7047 * has an instance name. This is ugly.
7049 if (this->layout
.flags
.q
.explicit_binding
) {
7050 apply_explicit_binding(state
, &loc
, var
,
7051 var
->get_interface_type(), &this->layout
);
7054 if (var
->type
->is_unsized_array()) {
7055 if (var
->is_in_shader_storage_block()) {
7056 if (!is_unsized_array_last_element(var
)) {
7057 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7058 "only last member of a shader storage block "
7059 "can be defined as unsized array",
7062 var
->data
.from_ssbo_unsized_array
= true;
7064 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7066 * "If an array is declared as the last member of a shader storage
7067 * block and the size is not specified at compile-time, it is
7068 * sized at run-time. In all other cases, arrays are sized only
7071 if (state
->es_shader
) {
7072 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7073 "only last member of a shader storage block "
7074 "can be defined as unsized array",
7080 state
->symbols
->add_variable(var
);
7081 instructions
->push_tail(var
);
7084 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7085 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7087 * It is also a compilation error ... to redeclare a built-in
7088 * block and then use a member from that built-in block that was
7089 * not included in the redeclaration.
7091 * This appears to be a clarification to the behaviour established
7092 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7093 * behaviour regardless of GLSL version.
7095 * To prevent the shader from using a member that was not included in
7096 * the redeclaration, we disable any ir_variables that are still
7097 * associated with the old declaration of gl_PerVertex (since we've
7098 * already updated all of the variables contained in the new
7099 * gl_PerVertex to point to it).
7101 * As a side effect this will prevent
7102 * validate_intrastage_interface_blocks() from getting confused and
7103 * thinking there are conflicting definitions of gl_PerVertex in the
7106 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7107 ir_variable
*const var
= node
->as_variable();
7109 var
->get_interface_type() == earlier_per_vertex
&&
7110 var
->data
.mode
== var_mode
) {
7111 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7112 _mesa_glsl_error(&loc
, state
,
7113 "redeclaration of gl_PerVertex cannot "
7114 "follow a redeclaration of `%s'",
7117 state
->symbols
->disable_variable(var
->name
);
7129 ast_tcs_output_layout::hir(exec_list
*instructions
,
7130 struct _mesa_glsl_parse_state
*state
)
7132 YYLTYPE loc
= this->get_location();
7134 unsigned num_vertices
;
7135 if (!state
->out_qualifier
->vertices
->
7136 process_qualifier_constant(state
, "vertices", &num_vertices
,
7138 /* return here to stop cascading incorrect error messages */
7142 /* If any shader outputs occurred before this declaration and specified an
7143 * array size, make sure the size they specified is consistent with the
7146 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7147 _mesa_glsl_error(&loc
, state
,
7148 "this tessellation control shader output layout "
7149 "specifies %u vertices, but a previous output "
7150 "is declared with size %u",
7151 num_vertices
, state
->tcs_output_size
);
7155 state
->tcs_output_vertices_specified
= true;
7157 /* If any shader outputs occurred before this declaration and did not
7158 * specify an array size, their size is determined now.
7160 foreach_in_list (ir_instruction
, node
, instructions
) {
7161 ir_variable
*var
= node
->as_variable();
7162 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7165 /* Note: Not all tessellation control shader output are arrays. */
7166 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7169 if (var
->data
.max_array_access
>= num_vertices
) {
7170 _mesa_glsl_error(&loc
, state
,
7171 "this tessellation control shader output layout "
7172 "specifies %u vertices, but an access to element "
7173 "%u of output `%s' already exists", num_vertices
,
7174 var
->data
.max_array_access
, var
->name
);
7176 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7186 ast_gs_input_layout::hir(exec_list
*instructions
,
7187 struct _mesa_glsl_parse_state
*state
)
7189 YYLTYPE loc
= this->get_location();
7191 /* If any geometry input layout declaration preceded this one, make sure it
7192 * was consistent with this one.
7194 if (state
->gs_input_prim_type_specified
&&
7195 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7196 _mesa_glsl_error(&loc
, state
,
7197 "geometry shader input layout does not match"
7198 " previous declaration");
7202 /* If any shader inputs occurred before this declaration and specified an
7203 * array size, make sure the size they specified is consistent with the
7206 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7207 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7208 _mesa_glsl_error(&loc
, state
,
7209 "this geometry shader input layout implies %u vertices"
7210 " per primitive, but a previous input is declared"
7211 " with size %u", num_vertices
, state
->gs_input_size
);
7215 state
->gs_input_prim_type_specified
= true;
7217 /* If any shader inputs occurred before this declaration and did not
7218 * specify an array size, their size is determined now.
7220 foreach_in_list(ir_instruction
, node
, instructions
) {
7221 ir_variable
*var
= node
->as_variable();
7222 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7225 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7229 if (var
->type
->is_unsized_array()) {
7230 if (var
->data
.max_array_access
>= num_vertices
) {
7231 _mesa_glsl_error(&loc
, state
,
7232 "this geometry shader input layout implies %u"
7233 " vertices, but an access to element %u of input"
7234 " `%s' already exists", num_vertices
,
7235 var
->data
.max_array_access
, var
->name
);
7237 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7248 ast_cs_input_layout::hir(exec_list
*instructions
,
7249 struct _mesa_glsl_parse_state
*state
)
7251 YYLTYPE loc
= this->get_location();
7253 /* From the ARB_compute_shader specification:
7255 * If the local size of the shader in any dimension is greater
7256 * than the maximum size supported by the implementation for that
7257 * dimension, a compile-time error results.
7259 * It is not clear from the spec how the error should be reported if
7260 * the total size of the work group exceeds
7261 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7262 * report it at compile time as well.
7264 GLuint64 total_invocations
= 1;
7265 unsigned qual_local_size
[3];
7266 for (int i
= 0; i
< 3; i
++) {
7268 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7270 /* Infer a local_size of 1 for unspecified dimensions */
7271 if (this->local_size
[i
] == NULL
) {
7272 qual_local_size
[i
] = 1;
7273 } else if (!this->local_size
[i
]->
7274 process_qualifier_constant(state
, local_size_str
,
7275 &qual_local_size
[i
], false)) {
7276 ralloc_free(local_size_str
);
7279 ralloc_free(local_size_str
);
7281 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7282 _mesa_glsl_error(&loc
, state
,
7283 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7285 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7288 total_invocations
*= qual_local_size
[i
];
7289 if (total_invocations
>
7290 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7291 _mesa_glsl_error(&loc
, state
,
7292 "product of local_sizes exceeds "
7293 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7294 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7299 /* If any compute input layout declaration preceded this one, make sure it
7300 * was consistent with this one.
7302 if (state
->cs_input_local_size_specified
) {
7303 for (int i
= 0; i
< 3; i
++) {
7304 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7305 _mesa_glsl_error(&loc
, state
,
7306 "compute shader input layout does not match"
7307 " previous declaration");
7313 state
->cs_input_local_size_specified
= true;
7314 for (int i
= 0; i
< 3; i
++)
7315 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7317 /* We may now declare the built-in constant gl_WorkGroupSize (see
7318 * builtin_variable_generator::generate_constants() for why we didn't
7319 * declare it earlier).
7321 ir_variable
*var
= new(state
->symbols
)
7322 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7323 var
->data
.how_declared
= ir_var_declared_implicitly
;
7324 var
->data
.read_only
= true;
7325 instructions
->push_tail(var
);
7326 state
->symbols
->add_variable(var
);
7327 ir_constant_data data
;
7328 memset(&data
, 0, sizeof(data
));
7329 for (int i
= 0; i
< 3; i
++)
7330 data
.u
[i
] = qual_local_size
[i
];
7331 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7332 var
->constant_initializer
=
7333 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7334 var
->data
.has_initializer
= true;
7341 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7342 exec_list
*instructions
)
7344 bool gl_FragColor_assigned
= false;
7345 bool gl_FragData_assigned
= false;
7346 bool gl_FragSecondaryColor_assigned
= false;
7347 bool gl_FragSecondaryData_assigned
= false;
7348 bool user_defined_fs_output_assigned
= false;
7349 ir_variable
*user_defined_fs_output
= NULL
;
7351 /* It would be nice to have proper location information. */
7353 memset(&loc
, 0, sizeof(loc
));
7355 foreach_in_list(ir_instruction
, node
, instructions
) {
7356 ir_variable
*var
= node
->as_variable();
7358 if (!var
|| !var
->data
.assigned
)
7361 if (strcmp(var
->name
, "gl_FragColor") == 0)
7362 gl_FragColor_assigned
= true;
7363 else if (strcmp(var
->name
, "gl_FragData") == 0)
7364 gl_FragData_assigned
= true;
7365 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7366 gl_FragSecondaryColor_assigned
= true;
7367 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7368 gl_FragSecondaryData_assigned
= true;
7369 else if (!is_gl_identifier(var
->name
)) {
7370 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7371 var
->data
.mode
== ir_var_shader_out
) {
7372 user_defined_fs_output_assigned
= true;
7373 user_defined_fs_output
= var
;
7378 /* From the GLSL 1.30 spec:
7380 * "If a shader statically assigns a value to gl_FragColor, it
7381 * may not assign a value to any element of gl_FragData. If a
7382 * shader statically writes a value to any element of
7383 * gl_FragData, it may not assign a value to
7384 * gl_FragColor. That is, a shader may assign values to either
7385 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7386 * linked together must also consistently write just one of
7387 * these variables. Similarly, if user declared output
7388 * variables are in use (statically assigned to), then the
7389 * built-in variables gl_FragColor and gl_FragData may not be
7390 * assigned to. These incorrect usages all generate compile
7393 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7394 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7395 "`gl_FragColor' and `gl_FragData'");
7396 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7397 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7398 "`gl_FragColor' and `%s'",
7399 user_defined_fs_output
->name
);
7400 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7401 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7402 "`gl_FragSecondaryColorEXT' and"
7403 " `gl_FragSecondaryDataEXT'");
7404 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7405 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7406 "`gl_FragColor' and"
7407 " `gl_FragSecondaryDataEXT'");
7408 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7409 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7411 " `gl_FragSecondaryColorEXT'");
7412 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7413 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7414 "`gl_FragData' and `%s'",
7415 user_defined_fs_output
->name
);
7418 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7419 !state
->EXT_blend_func_extended_enable
) {
7420 _mesa_glsl_error(&loc
, state
,
7421 "Dual source blending requires EXT_blend_func_extended");
7427 remove_per_vertex_blocks(exec_list
*instructions
,
7428 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7430 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7431 * if it exists in this shader type.
7433 const glsl_type
*per_vertex
= NULL
;
7435 case ir_var_shader_in
:
7436 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7437 per_vertex
= gl_in
->get_interface_type();
7439 case ir_var_shader_out
:
7440 if (ir_variable
*gl_Position
=
7441 state
->symbols
->get_variable("gl_Position")) {
7442 per_vertex
= gl_Position
->get_interface_type();
7446 assert(!"Unexpected mode");
7450 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7451 * need to do anything.
7453 if (per_vertex
== NULL
)
7456 /* If the interface block is used by the shader, then we don't need to do
7459 interface_block_usage_visitor
v(mode
, per_vertex
);
7460 v
.run(instructions
);
7461 if (v
.usage_found())
7464 /* Remove any ir_variable declarations that refer to the interface block
7467 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7468 ir_variable
*const var
= node
->as_variable();
7469 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
7470 var
->data
.mode
== mode
) {
7471 state
->symbols
->disable_variable(var
->name
);