2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "glsl_symbol_table.h"
53 #include "glsl_parser_extras.h"
55 #include "glsl_types.h"
56 #include "program/hash_table.h"
57 #include "main/shaderobj.h"
59 #include "ir_builder.h"
61 using namespace ir_builder
;
64 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
65 exec_list
*instructions
);
67 remove_per_vertex_blocks(exec_list
*instructions
,
68 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
71 * Visitor class that finds the first instance of any write-only variable that
72 * is ever read, if any
74 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
77 read_from_write_only_variable_visitor() : found(NULL
)
81 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
83 if (this->in_assignee
)
84 return visit_continue
;
86 ir_variable
*var
= ir
->variable_referenced();
87 /* We can have image_write_only set on both images and buffer variables,
88 * but in the former there is a distinction between reads from
89 * the variable itself (write_only) and from the memory they point to
90 * (image_write_only), while in the case of buffer variables there is
91 * no such distinction, that is why this check here is limited to
92 * buffer variables alone.
94 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
95 return visit_continue
;
97 if (var
->data
.image_write_only
) {
102 return visit_continue
;
105 ir_variable
*get_variable() {
114 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
116 _mesa_glsl_initialize_variables(instructions
, state
);
118 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
120 state
->current_function
= NULL
;
122 state
->toplevel_ir
= instructions
;
124 state
->gs_input_prim_type_specified
= false;
125 state
->tcs_output_vertices_specified
= false;
126 state
->cs_input_local_size_specified
= false;
128 /* Section 4.2 of the GLSL 1.20 specification states:
129 * "The built-in functions are scoped in a scope outside the global scope
130 * users declare global variables in. That is, a shader's global scope,
131 * available for user-defined functions and global variables, is nested
132 * inside the scope containing the built-in functions."
134 * Since built-in functions like ftransform() access built-in variables,
135 * it follows that those must be in the outer scope as well.
137 * We push scope here to create this nesting effect...but don't pop.
138 * This way, a shader's globals are still in the symbol table for use
141 state
->symbols
->push_scope();
143 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
144 ast
->hir(instructions
, state
);
146 detect_recursion_unlinked(state
, instructions
);
147 detect_conflicting_assignments(state
, instructions
);
149 state
->toplevel_ir
= NULL
;
151 /* Move all of the variable declarations to the front of the IR list, and
152 * reverse the order. This has the (intended!) side effect that vertex
153 * shader inputs and fragment shader outputs will appear in the IR in the
154 * same order that they appeared in the shader code. This results in the
155 * locations being assigned in the declared order. Many (arguably buggy)
156 * applications depend on this behavior, and it matches what nearly all
159 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
160 ir_variable
*const var
= node
->as_variable();
166 instructions
->push_head(var
);
169 /* Figure out if gl_FragCoord is actually used in fragment shader */
170 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
172 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
174 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
176 * If multiple shaders using members of a built-in block belonging to
177 * the same interface are linked together in the same program, they
178 * must all redeclare the built-in block in the same way, as described
179 * in section 4.3.7 "Interface Blocks" for interface block matching, or
180 * a link error will result.
182 * The phrase "using members of a built-in block" implies that if two
183 * shaders are linked together and one of them *does not use* any members
184 * of the built-in block, then that shader does not need to have a matching
185 * redeclaration of the built-in block.
187 * This appears to be a clarification to the behaviour established for
188 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
191 * The definition of "interface" in section 4.3.7 that applies here is as
194 * The boundary between adjacent programmable pipeline stages: This
195 * spans all the outputs in all compilation units of the first stage
196 * and all the inputs in all compilation units of the second stage.
198 * Therefore this rule applies to both inter- and intra-stage linking.
200 * The easiest way to implement this is to check whether the shader uses
201 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
202 * remove all the relevant variable declaration from the IR, so that the
203 * linker won't see them and complain about mismatches.
205 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
206 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
208 /* Check that we don't have reads from write-only variables */
209 read_from_write_only_variable_visitor v
;
211 ir_variable
*error_var
= v
.get_variable();
213 /* It would be nice to have proper location information, but for that
214 * we would need to check this as we process each kind of AST node
217 memset(&loc
, 0, sizeof(loc
));
218 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
224 static ir_expression_operation
225 get_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
226 struct _mesa_glsl_parse_state
*state
)
228 switch (to
->base_type
) {
229 case GLSL_TYPE_FLOAT
:
230 switch (from
->base_type
) {
231 case GLSL_TYPE_INT
: return ir_unop_i2f
;
232 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
233 case GLSL_TYPE_DOUBLE
: return ir_unop_d2f
;
234 default: return (ir_expression_operation
)0;
238 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
)
239 return (ir_expression_operation
)0;
240 switch (from
->base_type
) {
241 case GLSL_TYPE_INT
: return ir_unop_i2u
;
242 default: return (ir_expression_operation
)0;
245 case GLSL_TYPE_DOUBLE
:
246 if (!state
->has_double())
247 return (ir_expression_operation
)0;
248 switch (from
->base_type
) {
249 case GLSL_TYPE_INT
: return ir_unop_i2d
;
250 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
251 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
252 default: return (ir_expression_operation
)0;
255 default: return (ir_expression_operation
)0;
261 * If a conversion is available, convert one operand to a different type
263 * The \c from \c ir_rvalue is converted "in place".
265 * \param to Type that the operand it to be converted to
266 * \param from Operand that is being converted
267 * \param state GLSL compiler state
270 * If a conversion is possible (or unnecessary), \c true is returned.
271 * Otherwise \c false is returned.
274 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
275 struct _mesa_glsl_parse_state
*state
)
278 if (to
->base_type
== from
->type
->base_type
)
281 /* Prior to GLSL 1.20, there are no implicit conversions */
282 if (!state
->is_version(120, 0))
285 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
287 * "There are no implicit array or structure conversions. For
288 * example, an array of int cannot be implicitly converted to an
291 if (!to
->is_numeric() || !from
->type
->is_numeric())
294 /* We don't actually want the specific type `to`, we want a type
295 * with the same base type as `to`, but the same vector width as
298 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
299 from
->type
->matrix_columns
);
301 ir_expression_operation op
= get_conversion_operation(to
, from
->type
, state
);
303 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
311 static const struct glsl_type
*
312 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
314 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
316 const glsl_type
*type_a
= value_a
->type
;
317 const glsl_type
*type_b
= value_b
->type
;
319 /* From GLSL 1.50 spec, page 56:
321 * "The arithmetic binary operators add (+), subtract (-),
322 * multiply (*), and divide (/) operate on integer and
323 * floating-point scalars, vectors, and matrices."
325 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
326 _mesa_glsl_error(loc
, state
,
327 "operands to arithmetic operators must be numeric");
328 return glsl_type::error_type
;
332 /* "If one operand is floating-point based and the other is
333 * not, then the conversions from Section 4.1.10 "Implicit
334 * Conversions" are applied to the non-floating-point-based operand."
336 if (!apply_implicit_conversion(type_a
, value_b
, state
)
337 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
338 _mesa_glsl_error(loc
, state
,
339 "could not implicitly convert operands to "
340 "arithmetic operator");
341 return glsl_type::error_type
;
343 type_a
= value_a
->type
;
344 type_b
= value_b
->type
;
346 /* "If the operands are integer types, they must both be signed or
349 * From this rule and the preceeding conversion it can be inferred that
350 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
351 * The is_numeric check above already filtered out the case where either
352 * type is not one of these, so now the base types need only be tested for
355 if (type_a
->base_type
!= type_b
->base_type
) {
356 _mesa_glsl_error(loc
, state
,
357 "base type mismatch for arithmetic operator");
358 return glsl_type::error_type
;
361 /* "All arithmetic binary operators result in the same fundamental type
362 * (signed integer, unsigned integer, or floating-point) as the
363 * operands they operate on, after operand type conversion. After
364 * conversion, the following cases are valid
366 * * The two operands are scalars. In this case the operation is
367 * applied, resulting in a scalar."
369 if (type_a
->is_scalar() && type_b
->is_scalar())
372 /* "* One operand is a scalar, and the other is a vector or matrix.
373 * In this case, the scalar operation is applied independently to each
374 * component of the vector or matrix, resulting in the same size
377 if (type_a
->is_scalar()) {
378 if (!type_b
->is_scalar())
380 } else if (type_b
->is_scalar()) {
384 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
385 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
388 assert(!type_a
->is_scalar());
389 assert(!type_b
->is_scalar());
391 /* "* The two operands are vectors of the same size. In this case, the
392 * operation is done component-wise resulting in the same size
395 if (type_a
->is_vector() && type_b
->is_vector()) {
396 if (type_a
== type_b
) {
399 _mesa_glsl_error(loc
, state
,
400 "vector size mismatch for arithmetic operator");
401 return glsl_type::error_type
;
405 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
406 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
407 * <vector, vector> have been handled. At least one of the operands must
408 * be matrix. Further, since there are no integer matrix types, the base
409 * type of both operands must be float.
411 assert(type_a
->is_matrix() || type_b
->is_matrix());
412 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
||
413 type_a
->base_type
== GLSL_TYPE_DOUBLE
);
414 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
||
415 type_b
->base_type
== GLSL_TYPE_DOUBLE
);
417 /* "* The operator is add (+), subtract (-), or divide (/), and the
418 * operands are matrices with the same number of rows and the same
419 * number of columns. In this case, the operation is done component-
420 * wise resulting in the same size matrix."
421 * * The operator is multiply (*), where both operands are matrices or
422 * one operand is a vector and the other a matrix. A right vector
423 * operand is treated as a column vector and a left vector operand as a
424 * row vector. In all these cases, it is required that the number of
425 * columns of the left operand is equal to the number of rows of the
426 * right operand. Then, the multiply (*) operation does a linear
427 * algebraic multiply, yielding an object that has the same number of
428 * rows as the left operand and the same number of columns as the right
429 * operand. Section 5.10 "Vector and Matrix Operations" explains in
430 * more detail how vectors and matrices are operated on."
433 if (type_a
== type_b
)
436 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
438 if (type
== glsl_type::error_type
) {
439 _mesa_glsl_error(loc
, state
,
440 "size mismatch for matrix multiplication");
447 /* "All other cases are illegal."
449 _mesa_glsl_error(loc
, state
, "type mismatch");
450 return glsl_type::error_type
;
454 static const struct glsl_type
*
455 unary_arithmetic_result_type(const struct glsl_type
*type
,
456 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
458 /* From GLSL 1.50 spec, page 57:
460 * "The arithmetic unary operators negate (-), post- and pre-increment
461 * and decrement (-- and ++) operate on integer or floating-point
462 * values (including vectors and matrices). All unary operators work
463 * component-wise on their operands. These result with the same type
466 if (!type
->is_numeric()) {
467 _mesa_glsl_error(loc
, state
,
468 "operands to arithmetic operators must be numeric");
469 return glsl_type::error_type
;
476 * \brief Return the result type of a bit-logic operation.
478 * If the given types to the bit-logic operator are invalid, return
479 * glsl_type::error_type.
481 * \param type_a Type of LHS of bit-logic op
482 * \param type_b Type of RHS of bit-logic op
484 static const struct glsl_type
*
485 bit_logic_result_type(const struct glsl_type
*type_a
,
486 const struct glsl_type
*type_b
,
488 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
490 if (!state
->check_bitwise_operations_allowed(loc
)) {
491 return glsl_type::error_type
;
494 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
496 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
497 * (|). The operands must be of type signed or unsigned integers or
500 if (!type_a
->is_integer()) {
501 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
502 ast_expression::operator_string(op
));
503 return glsl_type::error_type
;
505 if (!type_b
->is_integer()) {
506 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
507 ast_expression::operator_string(op
));
508 return glsl_type::error_type
;
511 /* "The fundamental types of the operands (signed or unsigned) must
514 if (type_a
->base_type
!= type_b
->base_type
) {
515 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
516 "base type", ast_expression::operator_string(op
));
517 return glsl_type::error_type
;
520 /* "The operands cannot be vectors of differing size." */
521 if (type_a
->is_vector() &&
522 type_b
->is_vector() &&
523 type_a
->vector_elements
!= type_b
->vector_elements
) {
524 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
525 "different sizes", ast_expression::operator_string(op
));
526 return glsl_type::error_type
;
529 /* "If one operand is a scalar and the other a vector, the scalar is
530 * applied component-wise to the vector, resulting in the same type as
531 * the vector. The fundamental types of the operands [...] will be the
532 * resulting fundamental type."
534 if (type_a
->is_scalar())
540 static const struct glsl_type
*
541 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
542 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
544 const glsl_type
*type_a
= value_a
->type
;
545 const glsl_type
*type_b
= value_b
->type
;
547 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
548 return glsl_type::error_type
;
551 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
553 * "The operator modulus (%) operates on signed or unsigned integers or
556 if (!type_a
->is_integer()) {
557 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
558 return glsl_type::error_type
;
560 if (!type_b
->is_integer()) {
561 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
562 return glsl_type::error_type
;
565 /* "If the fundamental types in the operands do not match, then the
566 * conversions from section 4.1.10 "Implicit Conversions" are applied
567 * to create matching types."
569 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
570 * int -> uint conversion rules. Prior to that, there were no implicit
571 * conversions. So it's harmless to apply them universally - no implicit
572 * conversions will exist. If the types don't match, we'll receive false,
573 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
575 * "The operand types must both be signed or unsigned."
577 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
578 !apply_implicit_conversion(type_b
, value_a
, state
)) {
579 _mesa_glsl_error(loc
, state
,
580 "could not implicitly convert operands to "
581 "modulus (%%) operator");
582 return glsl_type::error_type
;
584 type_a
= value_a
->type
;
585 type_b
= value_b
->type
;
587 /* "The operands cannot be vectors of differing size. If one operand is
588 * a scalar and the other vector, then the scalar is applied component-
589 * wise to the vector, resulting in the same type as the vector. If both
590 * are vectors of the same size, the result is computed component-wise."
592 if (type_a
->is_vector()) {
593 if (!type_b
->is_vector()
594 || (type_a
->vector_elements
== type_b
->vector_elements
))
599 /* "The operator modulus (%) is not defined for any other data types
600 * (non-integer types)."
602 _mesa_glsl_error(loc
, state
, "type mismatch");
603 return glsl_type::error_type
;
607 static const struct glsl_type
*
608 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
609 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
611 const glsl_type
*type_a
= value_a
->type
;
612 const glsl_type
*type_b
= value_b
->type
;
614 /* From GLSL 1.50 spec, page 56:
615 * "The relational operators greater than (>), less than (<), greater
616 * than or equal (>=), and less than or equal (<=) operate only on
617 * scalar integer and scalar floating-point expressions."
619 if (!type_a
->is_numeric()
620 || !type_b
->is_numeric()
621 || !type_a
->is_scalar()
622 || !type_b
->is_scalar()) {
623 _mesa_glsl_error(loc
, state
,
624 "operands to relational operators must be scalar and "
626 return glsl_type::error_type
;
629 /* "Either the operands' types must match, or the conversions from
630 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
631 * operand, after which the types must match."
633 if (!apply_implicit_conversion(type_a
, value_b
, state
)
634 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
635 _mesa_glsl_error(loc
, state
,
636 "could not implicitly convert operands to "
637 "relational operator");
638 return glsl_type::error_type
;
640 type_a
= value_a
->type
;
641 type_b
= value_b
->type
;
643 if (type_a
->base_type
!= type_b
->base_type
) {
644 _mesa_glsl_error(loc
, state
, "base type mismatch");
645 return glsl_type::error_type
;
648 /* "The result is scalar Boolean."
650 return glsl_type::bool_type
;
654 * \brief Return the result type of a bit-shift operation.
656 * If the given types to the bit-shift operator are invalid, return
657 * glsl_type::error_type.
659 * \param type_a Type of LHS of bit-shift op
660 * \param type_b Type of RHS of bit-shift op
662 static const struct glsl_type
*
663 shift_result_type(const struct glsl_type
*type_a
,
664 const struct glsl_type
*type_b
,
666 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
668 if (!state
->check_bitwise_operations_allowed(loc
)) {
669 return glsl_type::error_type
;
672 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
674 * "The shift operators (<<) and (>>). For both operators, the operands
675 * must be signed or unsigned integers or integer vectors. One operand
676 * can be signed while the other is unsigned."
678 if (!type_a
->is_integer()) {
679 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
680 "integer vector", ast_expression::operator_string(op
));
681 return glsl_type::error_type
;
684 if (!type_b
->is_integer()) {
685 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
686 "integer vector", ast_expression::operator_string(op
));
687 return glsl_type::error_type
;
690 /* "If the first operand is a scalar, the second operand has to be
693 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
694 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
695 "second must be scalar as well",
696 ast_expression::operator_string(op
));
697 return glsl_type::error_type
;
700 /* If both operands are vectors, check that they have same number of
703 if (type_a
->is_vector() &&
704 type_b
->is_vector() &&
705 type_a
->vector_elements
!= type_b
->vector_elements
) {
706 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
707 "have same number of elements",
708 ast_expression::operator_string(op
));
709 return glsl_type::error_type
;
712 /* "In all cases, the resulting type will be the same type as the left
719 * Returns the innermost array index expression in an rvalue tree.
720 * This is the largest indexing level -- if an array of blocks, then
721 * it is the block index rather than an indexing expression for an
722 * array-typed member of an array of blocks.
725 find_innermost_array_index(ir_rvalue
*rv
)
727 ir_dereference_array
*last
= NULL
;
729 if (rv
->as_dereference_array()) {
730 last
= rv
->as_dereference_array();
732 } else if (rv
->as_dereference_record())
733 rv
= rv
->as_dereference_record()->record
;
734 else if (rv
->as_swizzle())
735 rv
= rv
->as_swizzle()->val
;
741 return last
->array_index
;
747 * Validates that a value can be assigned to a location with a specified type
749 * Validates that \c rhs can be assigned to some location. If the types are
750 * not an exact match but an automatic conversion is possible, \c rhs will be
754 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
755 * Otherwise the actual RHS to be assigned will be returned. This may be
756 * \c rhs, or it may be \c rhs after some type conversion.
759 * In addition to being used for assignments, this function is used to
760 * type-check return values.
763 validate_assignment(struct _mesa_glsl_parse_state
*state
,
764 YYLTYPE loc
, ir_rvalue
*lhs
,
765 ir_rvalue
*rhs
, bool is_initializer
)
767 /* If there is already some error in the RHS, just return it. Anything
768 * else will lead to an avalanche of error message back to the user.
770 if (rhs
->type
->is_error())
773 /* In the Tessellation Control Shader:
774 * If a per-vertex output variable is used as an l-value, it is an error
775 * if the expression indicating the vertex number is not the identifier
778 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
779 ir_variable
*var
= lhs
->variable_referenced();
780 if (var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
781 ir_rvalue
*index
= find_innermost_array_index(lhs
);
782 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
783 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
784 _mesa_glsl_error(&loc
, state
,
785 "Tessellation control shader outputs can only "
786 "be indexed by gl_InvocationID");
792 /* If the types are identical, the assignment can trivially proceed.
794 if (rhs
->type
== lhs
->type
)
797 /* If the array element types are the same and the LHS is unsized,
798 * the assignment is okay for initializers embedded in variable
801 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
802 * is handled by ir_dereference::is_lvalue.
804 const glsl_type
*lhs_t
= lhs
->type
;
805 const glsl_type
*rhs_t
= rhs
->type
;
806 bool unsized_array
= false;
807 while(lhs_t
->is_array()) {
809 break; /* the rest of the inner arrays match so break out early */
810 if (!rhs_t
->is_array()) {
811 unsized_array
= false;
812 break; /* number of dimensions mismatch */
814 if (lhs_t
->length
== rhs_t
->length
) {
815 lhs_t
= lhs_t
->fields
.array
;
816 rhs_t
= rhs_t
->fields
.array
;
818 } else if (lhs_t
->is_unsized_array()) {
819 unsized_array
= true;
821 unsized_array
= false;
822 break; /* sized array mismatch */
824 lhs_t
= lhs_t
->fields
.array
;
825 rhs_t
= rhs_t
->fields
.array
;
828 if (is_initializer
) {
831 _mesa_glsl_error(&loc
, state
,
832 "implicitly sized arrays cannot be assigned");
837 /* Check for implicit conversion in GLSL 1.20 */
838 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
839 if (rhs
->type
== lhs
->type
)
843 _mesa_glsl_error(&loc
, state
,
844 "%s of type %s cannot be assigned to "
845 "variable of type %s",
846 is_initializer
? "initializer" : "value",
847 rhs
->type
->name
, lhs
->type
->name
);
853 mark_whole_array_access(ir_rvalue
*access
)
855 ir_dereference_variable
*deref
= access
->as_dereference_variable();
857 if (deref
&& deref
->var
) {
858 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
863 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
864 const char *non_lvalue_description
,
865 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
866 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
871 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
873 ir_variable
*lhs_var
= lhs
->variable_referenced();
875 lhs_var
->data
.assigned
= true;
877 if (!error_emitted
) {
878 if (non_lvalue_description
!= NULL
) {
879 _mesa_glsl_error(&lhs_loc
, state
,
881 non_lvalue_description
);
882 error_emitted
= true;
883 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
884 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
885 lhs_var
->data
.image_read_only
))) {
886 /* We can have image_read_only set on both images and buffer variables,
887 * but in the former there is a distinction between assignments to
888 * the variable itself (read_only) and to the memory they point to
889 * (image_read_only), while in the case of buffer variables there is
890 * no such distinction, that is why this check here is limited to
891 * buffer variables alone.
893 _mesa_glsl_error(&lhs_loc
, state
,
894 "assignment to read-only variable '%s'",
896 error_emitted
= true;
897 } else if (lhs
->type
->is_array() &&
898 !state
->check_version(120, 300, &lhs_loc
,
899 "whole array assignment forbidden")) {
900 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
902 * "Other binary or unary expressions, non-dereferenced
903 * arrays, function names, swizzles with repeated fields,
904 * and constants cannot be l-values."
906 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
908 error_emitted
= true;
909 } else if (!lhs
->is_lvalue()) {
910 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
911 error_emitted
= true;
916 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
917 if (new_rhs
!= NULL
) {
920 /* If the LHS array was not declared with a size, it takes it size from
921 * the RHS. If the LHS is an l-value and a whole array, it must be a
922 * dereference of a variable. Any other case would require that the LHS
923 * is either not an l-value or not a whole array.
925 if (lhs
->type
->is_unsized_array()) {
926 ir_dereference
*const d
= lhs
->as_dereference();
930 ir_variable
*const var
= d
->variable_referenced();
934 if (var
->data
.max_array_access
>= unsigned(rhs
->type
->array_size())) {
935 /* FINISHME: This should actually log the location of the RHS. */
936 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
938 var
->data
.max_array_access
);
941 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
942 rhs
->type
->array_size());
945 if (lhs
->type
->is_array()) {
946 mark_whole_array_access(rhs
);
947 mark_whole_array_access(lhs
);
951 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
952 * but not post_inc) need the converted assigned value as an rvalue
953 * to handle things like:
958 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
960 instructions
->push_tail(var
);
961 instructions
->push_tail(assign(var
, rhs
));
963 if (!error_emitted
) {
964 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
965 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
967 ir_rvalue
*rvalue
= new(ctx
) ir_dereference_variable(var
);
969 *out_rvalue
= rvalue
;
972 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
976 return error_emitted
;
980 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
982 void *ctx
= ralloc_parent(lvalue
);
985 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
987 instructions
->push_tail(var
);
989 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
992 return new(ctx
) ir_dereference_variable(var
);
997 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1006 ast_node::has_sequence_subexpression() const
1012 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1013 struct _mesa_glsl_parse_state
*state
)
1015 (void)hir(instructions
, state
);
1019 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1020 struct _mesa_glsl_parse_state
*state
)
1022 (void)hir(instructions
, state
);
1026 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1029 ir_rvalue
*cmp
= NULL
;
1031 if (operation
== ir_binop_all_equal
)
1032 join_op
= ir_binop_logic_and
;
1034 join_op
= ir_binop_logic_or
;
1036 switch (op0
->type
->base_type
) {
1037 case GLSL_TYPE_FLOAT
:
1038 case GLSL_TYPE_UINT
:
1040 case GLSL_TYPE_BOOL
:
1041 case GLSL_TYPE_DOUBLE
:
1042 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1044 case GLSL_TYPE_ARRAY
: {
1045 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1046 ir_rvalue
*e0
, *e1
, *result
;
1048 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1049 new(mem_ctx
) ir_constant(i
));
1050 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1051 new(mem_ctx
) ir_constant(i
));
1052 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1055 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1061 mark_whole_array_access(op0
);
1062 mark_whole_array_access(op1
);
1066 case GLSL_TYPE_STRUCT
: {
1067 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1068 ir_rvalue
*e0
, *e1
, *result
;
1069 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1071 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1073 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1075 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1078 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1086 case GLSL_TYPE_ERROR
:
1087 case GLSL_TYPE_VOID
:
1088 case GLSL_TYPE_SAMPLER
:
1089 case GLSL_TYPE_IMAGE
:
1090 case GLSL_TYPE_INTERFACE
:
1091 case GLSL_TYPE_ATOMIC_UINT
:
1092 case GLSL_TYPE_SUBROUTINE
:
1093 /* I assume a comparison of a struct containing a sampler just
1094 * ignores the sampler present in the type.
1100 cmp
= new(mem_ctx
) ir_constant(true);
1105 /* For logical operations, we want to ensure that the operands are
1106 * scalar booleans. If it isn't, emit an error and return a constant
1107 * boolean to avoid triggering cascading error messages.
1110 get_scalar_boolean_operand(exec_list
*instructions
,
1111 struct _mesa_glsl_parse_state
*state
,
1112 ast_expression
*parent_expr
,
1114 const char *operand_name
,
1115 bool *error_emitted
)
1117 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1119 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1121 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1124 if (!*error_emitted
) {
1125 YYLTYPE loc
= expr
->get_location();
1126 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1128 parent_expr
->operator_string(parent_expr
->oper
));
1129 *error_emitted
= true;
1132 return new(ctx
) ir_constant(true);
1136 * If name refers to a builtin array whose maximum allowed size is less than
1137 * size, report an error and return true. Otherwise return false.
1140 check_builtin_array_max_size(const char *name
, unsigned size
,
1141 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1143 if ((strcmp("gl_TexCoord", name
) == 0)
1144 && (size
> state
->Const
.MaxTextureCoords
)) {
1145 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1147 * "The size [of gl_TexCoord] can be at most
1148 * gl_MaxTextureCoords."
1150 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1151 "be larger than gl_MaxTextureCoords (%u)",
1152 state
->Const
.MaxTextureCoords
);
1153 } else if (strcmp("gl_ClipDistance", name
) == 0
1154 && size
> state
->Const
.MaxClipPlanes
) {
1155 /* From section 7.1 (Vertex Shader Special Variables) of the
1158 * "The gl_ClipDistance array is predeclared as unsized and
1159 * must be sized by the shader either redeclaring it with a
1160 * size or indexing it only with integral constant
1161 * expressions. ... The size can be at most
1162 * gl_MaxClipDistances."
1164 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1165 "be larger than gl_MaxClipDistances (%u)",
1166 state
->Const
.MaxClipPlanes
);
1171 * Create the constant 1, of a which is appropriate for incrementing and
1172 * decrementing values of the given GLSL type. For example, if type is vec4,
1173 * this creates a constant value of 1.0 having type float.
1175 * If the given type is invalid for increment and decrement operators, return
1176 * a floating point 1--the error will be detected later.
1179 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1181 switch (type
->base_type
) {
1182 case GLSL_TYPE_UINT
:
1183 return new(ctx
) ir_constant((unsigned) 1);
1185 return new(ctx
) ir_constant(1);
1187 case GLSL_TYPE_FLOAT
:
1188 return new(ctx
) ir_constant(1.0f
);
1193 ast_expression::hir(exec_list
*instructions
,
1194 struct _mesa_glsl_parse_state
*state
)
1196 return do_hir(instructions
, state
, true);
1200 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1201 struct _mesa_glsl_parse_state
*state
)
1203 do_hir(instructions
, state
, false);
1207 ast_expression::do_hir(exec_list
*instructions
,
1208 struct _mesa_glsl_parse_state
*state
,
1212 static const int operations
[AST_NUM_OPERATORS
] = {
1213 -1, /* ast_assign doesn't convert to ir_expression. */
1214 -1, /* ast_plus doesn't convert to ir_expression. */
1228 ir_binop_any_nequal
,
1238 /* Note: The following block of expression types actually convert
1239 * to multiple IR instructions.
1241 ir_binop_mul
, /* ast_mul_assign */
1242 ir_binop_div
, /* ast_div_assign */
1243 ir_binop_mod
, /* ast_mod_assign */
1244 ir_binop_add
, /* ast_add_assign */
1245 ir_binop_sub
, /* ast_sub_assign */
1246 ir_binop_lshift
, /* ast_ls_assign */
1247 ir_binop_rshift
, /* ast_rs_assign */
1248 ir_binop_bit_and
, /* ast_and_assign */
1249 ir_binop_bit_xor
, /* ast_xor_assign */
1250 ir_binop_bit_or
, /* ast_or_assign */
1252 -1, /* ast_conditional doesn't convert to ir_expression. */
1253 ir_binop_add
, /* ast_pre_inc. */
1254 ir_binop_sub
, /* ast_pre_dec. */
1255 ir_binop_add
, /* ast_post_inc. */
1256 ir_binop_sub
, /* ast_post_dec. */
1257 -1, /* ast_field_selection doesn't conv to ir_expression. */
1258 -1, /* ast_array_index doesn't convert to ir_expression. */
1259 -1, /* ast_function_call doesn't conv to ir_expression. */
1260 -1, /* ast_identifier doesn't convert to ir_expression. */
1261 -1, /* ast_int_constant doesn't convert to ir_expression. */
1262 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1263 -1, /* ast_float_constant doesn't conv to ir_expression. */
1264 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1265 -1, /* ast_sequence doesn't convert to ir_expression. */
1267 ir_rvalue
*result
= NULL
;
1269 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1270 bool error_emitted
= false;
1273 loc
= this->get_location();
1275 switch (this->oper
) {
1277 assert(!"ast_aggregate: Should never get here.");
1281 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1282 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1285 do_assignment(instructions
, state
,
1286 this->subexpressions
[0]->non_lvalue_description
,
1287 op
[0], op
[1], &result
, needs_rvalue
, false,
1288 this->subexpressions
[0]->get_location());
1293 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1295 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1297 error_emitted
= type
->is_error();
1303 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1305 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1307 error_emitted
= type
->is_error();
1309 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1317 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1318 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1320 type
= arithmetic_result_type(op
[0], op
[1],
1321 (this->oper
== ast_mul
),
1323 error_emitted
= type
->is_error();
1325 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1330 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1331 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1333 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1335 assert(operations
[this->oper
] == ir_binop_mod
);
1337 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1339 error_emitted
= type
->is_error();
1344 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1345 error_emitted
= true;
1348 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1349 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1350 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1352 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1354 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1361 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1362 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1364 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1366 /* The relational operators must either generate an error or result
1367 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1369 assert(type
->is_error()
1370 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1371 && type
->is_scalar()));
1373 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1375 error_emitted
= type
->is_error();
1380 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1381 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1383 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1385 * "The equality operators equal (==), and not equal (!=)
1386 * operate on all types. They result in a scalar Boolean. If
1387 * the operand types do not match, then there must be a
1388 * conversion from Section 4.1.10 "Implicit Conversions"
1389 * applied to one operand that can make them match, in which
1390 * case this conversion is done."
1393 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1394 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1395 "no operation `%1$s' exists that takes a left-hand "
1396 "operand of type 'void' or a right operand of type "
1397 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1398 error_emitted
= true;
1399 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1400 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1401 || (op
[0]->type
!= op
[1]->type
)) {
1402 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1403 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1404 error_emitted
= true;
1405 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1406 !state
->check_version(120, 300, &loc
,
1407 "array comparisons forbidden")) {
1408 error_emitted
= true;
1409 } else if ((op
[0]->type
->contains_opaque() ||
1410 op
[1]->type
->contains_opaque())) {
1411 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1412 error_emitted
= true;
1415 if (error_emitted
) {
1416 result
= new(ctx
) ir_constant(false);
1418 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1419 assert(result
->type
== glsl_type::bool_type
);
1426 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1427 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1428 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1430 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1432 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1436 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1438 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1439 error_emitted
= true;
1442 if (!op
[0]->type
->is_integer()) {
1443 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1444 error_emitted
= true;
1447 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1448 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1451 case ast_logic_and
: {
1452 exec_list rhs_instructions
;
1453 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1454 "LHS", &error_emitted
);
1455 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1456 "RHS", &error_emitted
);
1458 if (rhs_instructions
.is_empty()) {
1459 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1460 type
= result
->type
;
1462 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1465 instructions
->push_tail(tmp
);
1467 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1468 instructions
->push_tail(stmt
);
1470 stmt
->then_instructions
.append_list(&rhs_instructions
);
1471 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1472 ir_assignment
*const then_assign
=
1473 new(ctx
) ir_assignment(then_deref
, op
[1]);
1474 stmt
->then_instructions
.push_tail(then_assign
);
1476 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1477 ir_assignment
*const else_assign
=
1478 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1479 stmt
->else_instructions
.push_tail(else_assign
);
1481 result
= new(ctx
) ir_dereference_variable(tmp
);
1487 case ast_logic_or
: {
1488 exec_list rhs_instructions
;
1489 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1490 "LHS", &error_emitted
);
1491 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1492 "RHS", &error_emitted
);
1494 if (rhs_instructions
.is_empty()) {
1495 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1496 type
= result
->type
;
1498 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1501 instructions
->push_tail(tmp
);
1503 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1504 instructions
->push_tail(stmt
);
1506 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1507 ir_assignment
*const then_assign
=
1508 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1509 stmt
->then_instructions
.push_tail(then_assign
);
1511 stmt
->else_instructions
.append_list(&rhs_instructions
);
1512 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1513 ir_assignment
*const else_assign
=
1514 new(ctx
) ir_assignment(else_deref
, op
[1]);
1515 stmt
->else_instructions
.push_tail(else_assign
);
1517 result
= new(ctx
) ir_dereference_variable(tmp
);
1524 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1526 * "The logical binary operators and (&&), or ( | | ), and
1527 * exclusive or (^^). They operate only on two Boolean
1528 * expressions and result in a Boolean expression."
1530 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1532 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1535 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1540 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1541 "operand", &error_emitted
);
1543 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1547 case ast_mul_assign
:
1548 case ast_div_assign
:
1549 case ast_add_assign
:
1550 case ast_sub_assign
: {
1551 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1552 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1554 type
= arithmetic_result_type(op
[0], op
[1],
1555 (this->oper
== ast_mul_assign
),
1558 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1562 do_assignment(instructions
, state
,
1563 this->subexpressions
[0]->non_lvalue_description
,
1564 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1565 &result
, needs_rvalue
, false,
1566 this->subexpressions
[0]->get_location());
1568 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1569 * explicitly test for this because none of the binary expression
1570 * operators allow array operands either.
1576 case ast_mod_assign
: {
1577 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1578 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1580 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1582 assert(operations
[this->oper
] == ir_binop_mod
);
1584 ir_rvalue
*temp_rhs
;
1585 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1589 do_assignment(instructions
, state
,
1590 this->subexpressions
[0]->non_lvalue_description
,
1591 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1592 &result
, needs_rvalue
, false,
1593 this->subexpressions
[0]->get_location());
1598 case ast_rs_assign
: {
1599 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1600 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1601 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1603 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1604 type
, op
[0], op
[1]);
1606 do_assignment(instructions
, state
,
1607 this->subexpressions
[0]->non_lvalue_description
,
1608 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1609 &result
, needs_rvalue
, false,
1610 this->subexpressions
[0]->get_location());
1614 case ast_and_assign
:
1615 case ast_xor_assign
:
1616 case ast_or_assign
: {
1617 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1618 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1619 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1621 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1622 type
, op
[0], op
[1]);
1624 do_assignment(instructions
, state
,
1625 this->subexpressions
[0]->non_lvalue_description
,
1626 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1627 &result
, needs_rvalue
, false,
1628 this->subexpressions
[0]->get_location());
1632 case ast_conditional
: {
1633 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1635 * "The ternary selection operator (?:). It operates on three
1636 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1637 * first expression, which must result in a scalar Boolean."
1639 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1640 "condition", &error_emitted
);
1642 /* The :? operator is implemented by generating an anonymous temporary
1643 * followed by an if-statement. The last instruction in each branch of
1644 * the if-statement assigns a value to the anonymous temporary. This
1645 * temporary is the r-value of the expression.
1647 exec_list then_instructions
;
1648 exec_list else_instructions
;
1650 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1651 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1653 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1655 * "The second and third expressions can be any type, as
1656 * long their types match, or there is a conversion in
1657 * Section 4.1.10 "Implicit Conversions" that can be applied
1658 * to one of the expressions to make their types match. This
1659 * resulting matching type is the type of the entire
1662 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1663 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1664 || (op
[1]->type
!= op
[2]->type
)) {
1665 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1667 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1668 "operator must have matching types");
1669 error_emitted
= true;
1670 type
= glsl_type::error_type
;
1675 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1677 * "The second and third expressions must be the same type, but can
1678 * be of any type other than an array."
1680 if (type
->is_array() &&
1681 !state
->check_version(120, 300, &loc
,
1682 "second and third operands of ?: operator "
1683 "cannot be arrays")) {
1684 error_emitted
= true;
1687 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1689 * "Except for array indexing, structure member selection, and
1690 * parentheses, opaque variables are not allowed to be operands in
1691 * expressions; such use results in a compile-time error."
1693 if (type
->contains_opaque()) {
1694 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1695 "of the ?: operator");
1696 error_emitted
= true;
1699 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1701 if (then_instructions
.is_empty()
1702 && else_instructions
.is_empty()
1703 && cond_val
!= NULL
) {
1704 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1706 /* The copy to conditional_tmp reads the whole array. */
1707 if (type
->is_array()) {
1708 mark_whole_array_access(op
[1]);
1709 mark_whole_array_access(op
[2]);
1712 ir_variable
*const tmp
=
1713 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1714 instructions
->push_tail(tmp
);
1716 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1717 instructions
->push_tail(stmt
);
1719 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1720 ir_dereference
*const then_deref
=
1721 new(ctx
) ir_dereference_variable(tmp
);
1722 ir_assignment
*const then_assign
=
1723 new(ctx
) ir_assignment(then_deref
, op
[1]);
1724 stmt
->then_instructions
.push_tail(then_assign
);
1726 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1727 ir_dereference
*const else_deref
=
1728 new(ctx
) ir_dereference_variable(tmp
);
1729 ir_assignment
*const else_assign
=
1730 new(ctx
) ir_assignment(else_deref
, op
[2]);
1731 stmt
->else_instructions
.push_tail(else_assign
);
1733 result
= new(ctx
) ir_dereference_variable(tmp
);
1740 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1741 ? "pre-increment operation" : "pre-decrement operation";
1743 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1744 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1746 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1748 ir_rvalue
*temp_rhs
;
1749 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1753 do_assignment(instructions
, state
,
1754 this->subexpressions
[0]->non_lvalue_description
,
1755 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1756 &result
, needs_rvalue
, false,
1757 this->subexpressions
[0]->get_location());
1762 case ast_post_dec
: {
1763 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1764 ? "post-increment operation" : "post-decrement operation";
1765 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1766 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1768 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1770 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1772 ir_rvalue
*temp_rhs
;
1773 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1776 /* Get a temporary of a copy of the lvalue before it's modified.
1777 * This may get thrown away later.
1779 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1781 ir_rvalue
*junk_rvalue
;
1783 do_assignment(instructions
, state
,
1784 this->subexpressions
[0]->non_lvalue_description
,
1785 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1786 &junk_rvalue
, false, false,
1787 this->subexpressions
[0]->get_location());
1792 case ast_field_selection
:
1793 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1796 case ast_array_index
: {
1797 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1799 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1800 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1802 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1805 if (result
->type
->is_error())
1806 error_emitted
= true;
1811 case ast_unsized_array_dim
:
1812 assert(!"ast_unsized_array_dim: Should never get here.");
1815 case ast_function_call
:
1816 /* Should *NEVER* get here. ast_function_call should always be handled
1817 * by ast_function_expression::hir.
1822 case ast_identifier
: {
1823 /* ast_identifier can appear several places in a full abstract syntax
1824 * tree. This particular use must be at location specified in the grammar
1825 * as 'variable_identifier'.
1828 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1831 var
->data
.used
= true;
1832 result
= new(ctx
) ir_dereference_variable(var
);
1834 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1835 this->primary_expression
.identifier
);
1837 result
= ir_rvalue::error_value(ctx
);
1838 error_emitted
= true;
1843 case ast_int_constant
:
1844 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1847 case ast_uint_constant
:
1848 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1851 case ast_float_constant
:
1852 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1855 case ast_bool_constant
:
1856 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1859 case ast_double_constant
:
1860 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1863 case ast_sequence
: {
1864 /* It should not be possible to generate a sequence in the AST without
1865 * any expressions in it.
1867 assert(!this->expressions
.is_empty());
1869 /* The r-value of a sequence is the last expression in the sequence. If
1870 * the other expressions in the sequence do not have side-effects (and
1871 * therefore add instructions to the instruction list), they get dropped
1874 exec_node
*previous_tail_pred
= NULL
;
1875 YYLTYPE previous_operand_loc
= loc
;
1877 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1878 /* If one of the operands of comma operator does not generate any
1879 * code, we want to emit a warning. At each pass through the loop
1880 * previous_tail_pred will point to the last instruction in the
1881 * stream *before* processing the previous operand. Naturally,
1882 * instructions->tail_pred will point to the last instruction in the
1883 * stream *after* processing the previous operand. If the two
1884 * pointers match, then the previous operand had no effect.
1886 * The warning behavior here differs slightly from GCC. GCC will
1887 * only emit a warning if none of the left-hand operands have an
1888 * effect. However, it will emit a warning for each. I believe that
1889 * there are some cases in C (especially with GCC extensions) where
1890 * it is useful to have an intermediate step in a sequence have no
1891 * effect, but I don't think these cases exist in GLSL. Either way,
1892 * it would be a giant hassle to replicate that behavior.
1894 if (previous_tail_pred
== instructions
->tail_pred
) {
1895 _mesa_glsl_warning(&previous_operand_loc
, state
,
1896 "left-hand operand of comma expression has "
1900 /* tail_pred is directly accessed instead of using the get_tail()
1901 * method for performance reasons. get_tail() has extra code to
1902 * return NULL when the list is empty. We don't care about that
1903 * here, so using tail_pred directly is fine.
1905 previous_tail_pred
= instructions
->tail_pred
;
1906 previous_operand_loc
= ast
->get_location();
1908 result
= ast
->hir(instructions
, state
);
1911 /* Any errors should have already been emitted in the loop above.
1913 error_emitted
= true;
1917 type
= NULL
; /* use result->type, not type. */
1918 assert(result
!= NULL
|| !needs_rvalue
);
1920 if (result
&& result
->type
->is_error() && !error_emitted
)
1921 _mesa_glsl_error(& loc
, state
, "type mismatch");
1927 ast_expression::has_sequence_subexpression() const
1929 switch (this->oper
) {
1938 return this->subexpressions
[0]->has_sequence_subexpression();
1960 case ast_array_index
:
1961 case ast_mul_assign
:
1962 case ast_div_assign
:
1963 case ast_add_assign
:
1964 case ast_sub_assign
:
1965 case ast_mod_assign
:
1968 case ast_and_assign
:
1969 case ast_xor_assign
:
1971 return this->subexpressions
[0]->has_sequence_subexpression() ||
1972 this->subexpressions
[1]->has_sequence_subexpression();
1974 case ast_conditional
:
1975 return this->subexpressions
[0]->has_sequence_subexpression() ||
1976 this->subexpressions
[1]->has_sequence_subexpression() ||
1977 this->subexpressions
[2]->has_sequence_subexpression();
1982 case ast_field_selection
:
1983 case ast_identifier
:
1984 case ast_int_constant
:
1985 case ast_uint_constant
:
1986 case ast_float_constant
:
1987 case ast_bool_constant
:
1988 case ast_double_constant
:
1992 unreachable("ast_aggregate: Should never get here.");
1994 case ast_function_call
:
1995 unreachable("should be handled by ast_function_expression::hir");
1997 case ast_unsized_array_dim
:
1998 unreachable("ast_unsized_array_dim: Should never get here.");
2005 ast_expression_statement::hir(exec_list
*instructions
,
2006 struct _mesa_glsl_parse_state
*state
)
2008 /* It is possible to have expression statements that don't have an
2009 * expression. This is the solitary semicolon:
2011 * for (i = 0; i < 5; i++)
2014 * In this case the expression will be NULL. Test for NULL and don't do
2015 * anything in that case.
2017 if (expression
!= NULL
)
2018 expression
->hir_no_rvalue(instructions
, state
);
2020 /* Statements do not have r-values.
2027 ast_compound_statement::hir(exec_list
*instructions
,
2028 struct _mesa_glsl_parse_state
*state
)
2031 state
->symbols
->push_scope();
2033 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2034 ast
->hir(instructions
, state
);
2037 state
->symbols
->pop_scope();
2039 /* Compound statements do not have r-values.
2045 * Evaluate the given exec_node (which should be an ast_node representing
2046 * a single array dimension) and return its integer value.
2049 process_array_size(exec_node
*node
,
2050 struct _mesa_glsl_parse_state
*state
)
2052 exec_list dummy_instructions
;
2054 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2057 * Dimensions other than the outermost dimension can by unsized if they
2058 * are immediately sized by a constructor or initializer.
2060 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2063 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2064 YYLTYPE loc
= array_size
->get_location();
2067 _mesa_glsl_error(& loc
, state
,
2068 "array size could not be resolved");
2072 if (!ir
->type
->is_integer()) {
2073 _mesa_glsl_error(& loc
, state
,
2074 "array size must be integer type");
2078 if (!ir
->type
->is_scalar()) {
2079 _mesa_glsl_error(& loc
, state
,
2080 "array size must be scalar type");
2084 ir_constant
*const size
= ir
->constant_expression_value();
2085 if (size
== NULL
|| array_size
->has_sequence_subexpression()) {
2086 _mesa_glsl_error(& loc
, state
, "array size must be a "
2087 "constant valued expression");
2091 if (size
->value
.i
[0] <= 0) {
2092 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2096 assert(size
->type
== ir
->type
);
2098 /* If the array size is const (and we've verified that
2099 * it is) then no instructions should have been emitted
2100 * when we converted it to HIR. If they were emitted,
2101 * then either the array size isn't const after all, or
2102 * we are emitting unnecessary instructions.
2104 assert(dummy_instructions
.is_empty());
2106 return size
->value
.u
[0];
2109 static const glsl_type
*
2110 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2111 ast_array_specifier
*array_specifier
,
2112 struct _mesa_glsl_parse_state
*state
)
2114 const glsl_type
*array_type
= base
;
2116 if (array_specifier
!= NULL
) {
2117 if (base
->is_array()) {
2119 /* From page 19 (page 25) of the GLSL 1.20 spec:
2121 * "Only one-dimensional arrays may be declared."
2123 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2124 return glsl_type::error_type
;
2128 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2129 !node
->is_head_sentinel(); node
= node
->prev
) {
2130 unsigned array_size
= process_array_size(node
, state
);
2131 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2139 precision_qualifier_allowed(const glsl_type
*type
)
2141 /* Precision qualifiers apply to floating point, integer and opaque
2144 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2145 * "Any floating point or any integer declaration can have the type
2146 * preceded by one of these precision qualifiers [...] Literal
2147 * constants do not have precision qualifiers. Neither do Boolean
2150 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2153 * "Precision qualifiers are added for code portability with OpenGL
2154 * ES, not for functionality. They have the same syntax as in OpenGL
2157 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2159 * "uniform lowp sampler2D sampler;
2162 * lowp vec4 col = texture2D (sampler, coord);
2163 * // texture2D returns lowp"
2165 * From this, we infer that GLSL 1.30 (and later) should allow precision
2166 * qualifiers on sampler types just like float and integer types.
2168 return (type
->is_float()
2169 || type
->is_integer()
2170 || type
->contains_opaque())
2171 && !type
->without_array()->is_record();
2175 ast_type_specifier::glsl_type(const char **name
,
2176 struct _mesa_glsl_parse_state
*state
) const
2178 const struct glsl_type
*type
;
2180 type
= state
->symbols
->get_type(this->type_name
);
2181 *name
= this->type_name
;
2183 YYLTYPE loc
= this->get_location();
2184 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2190 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2192 * "The precision statement
2194 * precision precision-qualifier type;
2196 * can be used to establish a default precision qualifier. The type field can
2197 * be either int or float or any of the sampler types, (...) If type is float,
2198 * the directive applies to non-precision-qualified floating point type
2199 * (scalar, vector, and matrix) declarations. If type is int, the directive
2200 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2201 * and unsigned) declarations."
2203 * We use the symbol table to keep the values of the default precisions for
2204 * each 'type' in each scope and we use the 'type' string from the precision
2205 * statement as key in the symbol table. When we want to retrieve the default
2206 * precision associated with a given glsl_type we need to know the type string
2207 * associated with it. This is what this function returns.
2210 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2212 switch (type
->base_type
) {
2213 case GLSL_TYPE_FLOAT
:
2215 case GLSL_TYPE_UINT
:
2218 case GLSL_TYPE_ATOMIC_UINT
:
2219 return "atomic_uint";
2220 case GLSL_TYPE_IMAGE
:
2222 case GLSL_TYPE_SAMPLER
: {
2223 const unsigned type_idx
=
2224 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2225 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2226 assert(type_idx
< 4);
2227 switch (type
->sampler_type
) {
2228 case GLSL_TYPE_FLOAT
:
2229 switch (type
->sampler_dimensionality
) {
2230 case GLSL_SAMPLER_DIM_1D
: {
2231 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2232 static const char *const names
[4] = {
2233 "sampler1D", "sampler1DArray",
2234 "sampler1DShadow", "sampler1DArrayShadow"
2236 return names
[type_idx
];
2238 case GLSL_SAMPLER_DIM_2D
: {
2239 static const char *const names
[8] = {
2240 "sampler2D", "sampler2DArray",
2241 "sampler2DShadow", "sampler2DArrayShadow",
2242 "image2D", "image2DArray", NULL
, NULL
2244 return names
[offset
+ type_idx
];
2246 case GLSL_SAMPLER_DIM_3D
: {
2247 static const char *const names
[8] = {
2248 "sampler3D", NULL
, NULL
, NULL
,
2249 "image3D", NULL
, NULL
, NULL
2251 return names
[offset
+ type_idx
];
2253 case GLSL_SAMPLER_DIM_CUBE
: {
2254 static const char *const names
[8] = {
2255 "samplerCube", "samplerCubeArray",
2256 "samplerCubeShadow", "samplerCubeArrayShadow",
2257 "imageCube", NULL
, NULL
, NULL
2259 return names
[offset
+ type_idx
];
2261 case GLSL_SAMPLER_DIM_MS
: {
2262 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2263 static const char *const names
[4] = {
2264 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2266 return names
[type_idx
];
2268 case GLSL_SAMPLER_DIM_RECT
: {
2269 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2270 static const char *const names
[4] = {
2271 "samplerRect", NULL
, "samplerRectShadow", NULL
2273 return names
[type_idx
];
2275 case GLSL_SAMPLER_DIM_BUF
: {
2276 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2277 static const char *const names
[4] = {
2278 "samplerBuffer", NULL
, NULL
, NULL
2280 return names
[type_idx
];
2282 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2283 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2284 static const char *const names
[4] = {
2285 "samplerExternalOES", NULL
, NULL
, NULL
2287 return names
[type_idx
];
2290 unreachable("Unsupported sampler/image dimensionality");
2291 } /* sampler/image float dimensionality */
2294 switch (type
->sampler_dimensionality
) {
2295 case GLSL_SAMPLER_DIM_1D
: {
2296 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2297 static const char *const names
[4] = {
2298 "isampler1D", "isampler1DArray", NULL
, NULL
2300 return names
[type_idx
];
2302 case GLSL_SAMPLER_DIM_2D
: {
2303 static const char *const names
[8] = {
2304 "isampler2D", "isampler2DArray", NULL
, NULL
,
2305 "iimage2D", "iimage2DArray", NULL
, NULL
2307 return names
[offset
+ type_idx
];
2309 case GLSL_SAMPLER_DIM_3D
: {
2310 static const char *const names
[8] = {
2311 "isampler3D", NULL
, NULL
, NULL
,
2312 "iimage3D", NULL
, NULL
, NULL
2314 return names
[offset
+ type_idx
];
2316 case GLSL_SAMPLER_DIM_CUBE
: {
2317 static const char *const names
[8] = {
2318 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2319 "iimageCube", NULL
, NULL
, NULL
2321 return names
[offset
+ type_idx
];
2323 case GLSL_SAMPLER_DIM_MS
: {
2324 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2325 static const char *const names
[4] = {
2326 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2328 return names
[type_idx
];
2330 case GLSL_SAMPLER_DIM_RECT
: {
2331 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2332 static const char *const names
[4] = {
2333 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2335 return names
[type_idx
];
2337 case GLSL_SAMPLER_DIM_BUF
: {
2338 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2339 static const char *const names
[4] = {
2340 "isamplerBuffer", NULL
, NULL
, NULL
2342 return names
[type_idx
];
2345 unreachable("Unsupported isampler/iimage dimensionality");
2346 } /* sampler/image int dimensionality */
2348 case GLSL_TYPE_UINT
:
2349 switch (type
->sampler_dimensionality
) {
2350 case GLSL_SAMPLER_DIM_1D
: {
2351 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2352 static const char *const names
[4] = {
2353 "usampler1D", "usampler1DArray", NULL
, NULL
2355 return names
[type_idx
];
2357 case GLSL_SAMPLER_DIM_2D
: {
2358 static const char *const names
[8] = {
2359 "usampler2D", "usampler2DArray", NULL
, NULL
,
2360 "uimage2D", "uimage2DArray", NULL
, NULL
2362 return names
[offset
+ type_idx
];
2364 case GLSL_SAMPLER_DIM_3D
: {
2365 static const char *const names
[8] = {
2366 "usampler3D", NULL
, NULL
, NULL
,
2367 "uimage3D", NULL
, NULL
, NULL
2369 return names
[offset
+ type_idx
];
2371 case GLSL_SAMPLER_DIM_CUBE
: {
2372 static const char *const names
[8] = {
2373 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2374 "uimageCube", NULL
, NULL
, NULL
2376 return names
[offset
+ type_idx
];
2378 case GLSL_SAMPLER_DIM_MS
: {
2379 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2380 static const char *const names
[4] = {
2381 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2383 return names
[type_idx
];
2385 case GLSL_SAMPLER_DIM_RECT
: {
2386 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2387 static const char *const names
[4] = {
2388 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2390 return names
[type_idx
];
2392 case GLSL_SAMPLER_DIM_BUF
: {
2393 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2394 static const char *const names
[4] = {
2395 "usamplerBuffer", NULL
, NULL
, NULL
2397 return names
[type_idx
];
2400 unreachable("Unsupported usampler/uimage dimensionality");
2401 } /* sampler/image uint dimensionality */
2404 unreachable("Unsupported sampler/image type");
2405 } /* sampler/image type */
2407 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2410 unreachable("Unsupported type");
2415 select_gles_precision(unsigned qual_precision
,
2416 const glsl_type
*type
,
2417 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2419 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2420 * In GLES we take the precision from the type qualifier if present,
2421 * otherwise, if the type of the variable allows precision qualifiers at
2422 * all, we look for the default precision qualifier for that type in the
2425 assert(state
->es_shader
);
2427 unsigned precision
= GLSL_PRECISION_NONE
;
2428 if (qual_precision
) {
2429 precision
= qual_precision
;
2430 } else if (precision_qualifier_allowed(type
)) {
2431 const char *type_name
=
2432 get_type_name_for_precision_qualifier(type
->without_array());
2433 assert(type_name
!= NULL
);
2436 state
->symbols
->get_default_precision_qualifier(type_name
);
2437 if (precision
== ast_precision_none
) {
2438 _mesa_glsl_error(loc
, state
,
2439 "No precision specified in this scope for type `%s'",
2447 ast_fully_specified_type::glsl_type(const char **name
,
2448 struct _mesa_glsl_parse_state
*state
) const
2450 return this->specifier
->glsl_type(name
, state
);
2454 * Determine whether a toplevel variable declaration declares a varying. This
2455 * function operates by examining the variable's mode and the shader target,
2456 * so it correctly identifies linkage variables regardless of whether they are
2457 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2459 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2460 * this function will produce undefined results.
2463 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2466 case MESA_SHADER_VERTEX
:
2467 return var
->data
.mode
== ir_var_shader_out
;
2468 case MESA_SHADER_FRAGMENT
:
2469 return var
->data
.mode
== ir_var_shader_in
;
2471 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2477 * Matrix layout qualifiers are only allowed on certain types
2480 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2482 const glsl_type
*type
,
2485 if (var
&& !var
->is_in_buffer_block()) {
2486 /* Layout qualifiers may only apply to interface blocks and fields in
2489 _mesa_glsl_error(loc
, state
,
2490 "uniform block layout qualifiers row_major and "
2491 "column_major may not be applied to variables "
2492 "outside of uniform blocks");
2493 } else if (!type
->without_array()->is_matrix()) {
2494 /* The OpenGL ES 3.0 conformance tests did not originally allow
2495 * matrix layout qualifiers on non-matrices. However, the OpenGL
2496 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2497 * amended to specifically allow these layouts on all types. Emit
2498 * a warning so that people know their code may not be portable.
2500 _mesa_glsl_warning(loc
, state
,
2501 "uniform block layout qualifiers row_major and "
2502 "column_major applied to non-matrix types may "
2503 "be rejected by older compilers");
2508 process_qualifier_constant(struct _mesa_glsl_parse_state
*state
,
2510 const char *qual_indentifier
,
2514 if (qual_value
< 0) {
2515 _mesa_glsl_error(loc
, state
, "%s layout qualifier is invalid (%d < 0)",
2516 qual_indentifier
, qual_value
);
2520 *value
= (unsigned) qual_value
;
2525 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2528 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2529 _mesa_glsl_error(loc
, state
,
2530 "invalid stream specified %d is larger than "
2531 "MAX_VERTEX_STREAMS - 1 (%d).",
2532 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2540 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2543 const glsl_type
*type
,
2544 const ast_type_qualifier
*qual
)
2546 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2547 _mesa_glsl_error(loc
, state
,
2548 "the \"binding\" qualifier only applies to uniforms and "
2549 "shader storage buffer objects");
2553 unsigned qual_binding
;
2554 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2559 const struct gl_context
*const ctx
= state
->ctx
;
2560 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2561 unsigned max_index
= qual_binding
+ elements
- 1;
2562 const glsl_type
*base_type
= type
->without_array();
2564 if (base_type
->is_interface()) {
2565 /* UBOs. From page 60 of the GLSL 4.20 specification:
2566 * "If the binding point for any uniform block instance is less than zero,
2567 * or greater than or equal to the implementation-dependent maximum
2568 * number of uniform buffer bindings, a compilation error will occur.
2569 * When the binding identifier is used with a uniform block instanced as
2570 * an array of size N, all elements of the array from binding through
2571 * binding + N – 1 must be within this range."
2573 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2575 if (qual
->flags
.q
.uniform
&&
2576 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2577 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2578 "the maximum number of UBO binding points (%d)",
2579 qual_binding
, elements
,
2580 ctx
->Const
.MaxUniformBufferBindings
);
2584 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2585 * "If the binding point for any uniform or shader storage block instance
2586 * is less than zero, or greater than or equal to the
2587 * implementation-dependent maximum number of uniform buffer bindings, a
2588 * compile-time error will occur. When the binding identifier is used
2589 * with a uniform or shader storage block instanced as an array of size
2590 * N, all elements of the array from binding through binding + N – 1 must
2591 * be within this range."
2593 if (qual
->flags
.q
.buffer
&&
2594 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2595 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2596 "the maximum number of SSBO binding points (%d)",
2597 qual_binding
, elements
,
2598 ctx
->Const
.MaxShaderStorageBufferBindings
);
2601 } else if (base_type
->is_sampler()) {
2602 /* Samplers. From page 63 of the GLSL 4.20 specification:
2603 * "If the binding is less than zero, or greater than or equal to the
2604 * implementation-dependent maximum supported number of units, a
2605 * compilation error will occur. When the binding identifier is used
2606 * with an array of size N, all elements of the array from binding
2607 * through binding + N - 1 must be within this range."
2609 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2611 if (max_index
>= limit
) {
2612 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2613 "exceeds the maximum number of texture image units "
2614 "(%u)", qual_binding
, elements
, limit
);
2618 } else if (base_type
->contains_atomic()) {
2619 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2620 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2621 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2622 " maximum number of atomic counter buffer bindings"
2623 "(%u)", qual_binding
,
2624 ctx
->Const
.MaxAtomicBufferBindings
);
2628 } else if (state
->is_version(420, 310) && base_type
->is_image()) {
2629 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2630 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2631 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2632 " maximum number of image units (%d)", max_index
,
2633 ctx
->Const
.MaxImageUnits
);
2638 _mesa_glsl_error(loc
, state
,
2639 "the \"binding\" qualifier only applies to uniform "
2640 "blocks, opaque variables, or arrays thereof");
2644 var
->data
.explicit_binding
= true;
2645 var
->data
.binding
= qual_binding
;
2651 static glsl_interp_qualifier
2652 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2653 ir_variable_mode mode
,
2654 struct _mesa_glsl_parse_state
*state
,
2657 glsl_interp_qualifier interpolation
;
2658 if (qual
->flags
.q
.flat
)
2659 interpolation
= INTERP_QUALIFIER_FLAT
;
2660 else if (qual
->flags
.q
.noperspective
)
2661 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2662 else if (qual
->flags
.q
.smooth
)
2663 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2665 interpolation
= INTERP_QUALIFIER_NONE
;
2667 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2668 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2669 _mesa_glsl_error(loc
, state
,
2670 "interpolation qualifier `%s' can only be applied to "
2671 "shader inputs or outputs.",
2672 interpolation_string(interpolation
));
2676 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2677 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2678 _mesa_glsl_error(loc
, state
,
2679 "interpolation qualifier `%s' cannot be applied to "
2680 "vertex shader inputs or fragment shader outputs",
2681 interpolation_string(interpolation
));
2685 return interpolation
;
2690 apply_explicit_location(const struct ast_type_qualifier
*qual
,
2692 struct _mesa_glsl_parse_state
*state
,
2697 unsigned qual_location
;
2698 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
2703 /* Checks for GL_ARB_explicit_uniform_location. */
2704 if (qual
->flags
.q
.uniform
) {
2705 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2708 const struct gl_context
*const ctx
= state
->ctx
;
2709 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
2711 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2712 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2713 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2714 ctx
->Const
.MaxUserAssignableUniformLocations
);
2718 var
->data
.explicit_location
= true;
2719 var
->data
.location
= qual_location
;
2723 /* Between GL_ARB_explicit_attrib_location an
2724 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2725 * stage can be assigned explicit locations. The checking here associates
2726 * the correct extension with the correct stage's input / output:
2730 * vertex explicit_loc sso
2731 * tess control sso sso
2734 * fragment sso explicit_loc
2736 switch (state
->stage
) {
2737 case MESA_SHADER_VERTEX
:
2738 if (var
->data
.mode
== ir_var_shader_in
) {
2739 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2745 if (var
->data
.mode
== ir_var_shader_out
) {
2746 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2755 case MESA_SHADER_TESS_CTRL
:
2756 case MESA_SHADER_TESS_EVAL
:
2757 case MESA_SHADER_GEOMETRY
:
2758 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2759 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2768 case MESA_SHADER_FRAGMENT
:
2769 if (var
->data
.mode
== ir_var_shader_in
) {
2770 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2776 if (var
->data
.mode
== ir_var_shader_out
) {
2777 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2786 case MESA_SHADER_COMPUTE
:
2787 _mesa_glsl_error(loc
, state
,
2788 "compute shader variables cannot be given "
2789 "explicit locations");
2794 _mesa_glsl_error(loc
, state
,
2795 "%s cannot be given an explicit location in %s shader",
2797 _mesa_shader_stage_to_string(state
->stage
));
2799 var
->data
.explicit_location
= true;
2801 switch (state
->stage
) {
2802 case MESA_SHADER_VERTEX
:
2803 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2804 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
2805 : (qual_location
+ VARYING_SLOT_VAR0
);
2808 case MESA_SHADER_TESS_CTRL
:
2809 case MESA_SHADER_TESS_EVAL
:
2810 case MESA_SHADER_GEOMETRY
:
2811 if (var
->data
.patch
)
2812 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
2814 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
2817 case MESA_SHADER_FRAGMENT
:
2818 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2819 ? (qual_location
+ FRAG_RESULT_DATA0
)
2820 : (qual_location
+ VARYING_SLOT_VAR0
);
2822 case MESA_SHADER_COMPUTE
:
2823 assert(!"Unexpected shader type");
2827 unsigned qual_index
;
2828 if (qual
->flags
.q
.explicit_index
&&
2829 process_qualifier_constant(state
, loc
, "index", qual
->index
,
2831 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2832 * Layout Qualifiers):
2834 * "It is also a compile-time error if a fragment shader
2835 * sets a layout index to less than 0 or greater than 1."
2837 * Older specifications don't mandate a behavior; we take
2838 * this as a clarification and always generate the error.
2840 if (qual_index
> 1) {
2841 _mesa_glsl_error(loc
, state
,
2842 "explicit index may only be 0 or 1");
2844 var
->data
.explicit_index
= true;
2845 var
->data
.index
= qual_index
;
2852 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2854 struct _mesa_glsl_parse_state
*state
,
2857 const glsl_type
*base_type
= var
->type
->without_array();
2859 if (base_type
->is_image()) {
2860 if (var
->data
.mode
!= ir_var_uniform
&&
2861 var
->data
.mode
!= ir_var_function_in
) {
2862 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2863 "function parameters or uniform-qualified "
2864 "global variables");
2867 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2868 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2869 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2870 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2871 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2872 var
->data
.read_only
= true;
2874 if (qual
->flags
.q
.explicit_image_format
) {
2875 if (var
->data
.mode
== ir_var_function_in
) {
2876 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2877 "used on image function parameters");
2880 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2881 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2882 "base data type of the image");
2885 var
->data
.image_format
= qual
->image_format
;
2887 if (var
->data
.mode
== ir_var_uniform
) {
2888 if (state
->es_shader
) {
2889 _mesa_glsl_error(loc
, state
, "all image uniforms "
2890 "must have a format layout qualifier");
2892 } else if (!qual
->flags
.q
.write_only
) {
2893 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
2894 "`writeonly' must have a format layout "
2899 var
->data
.image_format
= GL_NONE
;
2902 /* From page 70 of the GLSL ES 3.1 specification:
2904 * "Except for image variables qualified with the format qualifiers
2905 * r32f, r32i, and r32ui, image variables must specify either memory
2906 * qualifier readonly or the memory qualifier writeonly."
2908 if (state
->es_shader
&&
2909 var
->data
.image_format
!= GL_R32F
&&
2910 var
->data
.image_format
!= GL_R32I
&&
2911 var
->data
.image_format
!= GL_R32UI
&&
2912 !var
->data
.image_read_only
&&
2913 !var
->data
.image_write_only
) {
2914 _mesa_glsl_error(loc
, state
, "image variables of format other than "
2915 "r32f, r32i or r32ui must be qualified `readonly' or "
2919 } else if (qual
->flags
.q
.read_only
||
2920 qual
->flags
.q
.write_only
||
2921 qual
->flags
.q
.coherent
||
2922 qual
->flags
.q
._volatile
||
2923 qual
->flags
.q
.restrict_flag
||
2924 qual
->flags
.q
.explicit_image_format
) {
2925 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
2930 static inline const char*
2931 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
2933 if (origin_upper_left
&& pixel_center_integer
)
2934 return "origin_upper_left, pixel_center_integer";
2935 else if (origin_upper_left
)
2936 return "origin_upper_left";
2937 else if (pixel_center_integer
)
2938 return "pixel_center_integer";
2944 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
2945 const struct ast_type_qualifier
*qual
)
2947 /* If gl_FragCoord was previously declared, and the qualifiers were
2948 * different in any way, return true.
2950 if (state
->fs_redeclares_gl_fragcoord
) {
2951 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
2952 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
2959 validate_array_dimensions(const glsl_type
*t
,
2960 struct _mesa_glsl_parse_state
*state
,
2962 if (t
->is_array()) {
2963 t
= t
->fields
.array
;
2964 while (t
->is_array()) {
2965 if (t
->is_unsized_array()) {
2966 _mesa_glsl_error(loc
, state
,
2967 "only the outermost array dimension can "
2972 t
= t
->fields
.array
;
2978 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2980 struct _mesa_glsl_parse_state
*state
,
2983 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
2985 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
2987 * "Within any shader, the first redeclarations of gl_FragCoord
2988 * must appear before any use of gl_FragCoord."
2990 * Generate a compiler error if above condition is not met by the
2993 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
2994 if (earlier
!= NULL
&&
2995 earlier
->data
.used
&&
2996 !state
->fs_redeclares_gl_fragcoord
) {
2997 _mesa_glsl_error(loc
, state
,
2998 "gl_FragCoord used before its first redeclaration "
2999 "in fragment shader");
3002 /* Make sure all gl_FragCoord redeclarations specify the same layout
3005 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3006 const char *const qual_string
=
3007 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3008 qual
->flags
.q
.pixel_center_integer
);
3010 const char *const state_string
=
3011 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3012 state
->fs_pixel_center_integer
);
3014 _mesa_glsl_error(loc
, state
,
3015 "gl_FragCoord redeclared with different layout "
3016 "qualifiers (%s) and (%s) ",
3020 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3021 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3022 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3023 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3024 state
->fs_redeclares_gl_fragcoord
=
3025 state
->fs_origin_upper_left
||
3026 state
->fs_pixel_center_integer
||
3027 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3030 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3031 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3032 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3033 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3034 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3035 ? "origin_upper_left" : "pixel_center_integer";
3037 _mesa_glsl_error(loc
, state
,
3038 "layout qualifier `%s' can only be applied to "
3039 "fragment shader input `gl_FragCoord'",
3043 if (qual
->flags
.q
.explicit_location
) {
3044 apply_explicit_location(qual
, var
, state
, loc
);
3045 } else if (qual
->flags
.q
.explicit_index
) {
3046 _mesa_glsl_error(loc
, state
, "explicit index requires explicit location");
3049 if (qual
->flags
.q
.explicit_binding
) {
3050 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3053 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3054 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3055 unsigned qual_stream
;
3056 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3058 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3059 var
->data
.stream
= qual_stream
;
3063 if (var
->type
->contains_atomic()) {
3064 if (var
->data
.mode
== ir_var_uniform
) {
3065 if (var
->data
.explicit_binding
) {
3067 &state
->atomic_counter_offsets
[var
->data
.binding
];
3069 if (*offset
% ATOMIC_COUNTER_SIZE
)
3070 _mesa_glsl_error(loc
, state
,
3071 "misaligned atomic counter offset");
3073 var
->data
.atomic
.offset
= *offset
;
3074 *offset
+= var
->type
->atomic_size();
3077 _mesa_glsl_error(loc
, state
,
3078 "atomic counters require explicit binding point");
3080 } else if (var
->data
.mode
!= ir_var_function_in
) {
3081 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3082 "function parameters or uniform-qualified "
3083 "global variables");
3087 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3088 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3089 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3090 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3091 * These extensions and all following extensions that add the 'layout'
3092 * keyword have been modified to require the use of 'in' or 'out'.
3094 * The following extension do not allow the deprecated keywords:
3096 * GL_AMD_conservative_depth
3097 * GL_ARB_conservative_depth
3098 * GL_ARB_gpu_shader5
3099 * GL_ARB_separate_shader_objects
3100 * GL_ARB_tessellation_shader
3101 * GL_ARB_transform_feedback3
3102 * GL_ARB_uniform_buffer_object
3104 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3105 * allow layout with the deprecated keywords.
3107 const bool relaxed_layout_qualifier_checking
=
3108 state
->ARB_fragment_coord_conventions_enable
;
3110 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3111 || qual
->flags
.q
.varying
;
3112 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3113 if (relaxed_layout_qualifier_checking
) {
3114 _mesa_glsl_warning(loc
, state
,
3115 "`layout' qualifier may not be used with "
3116 "`attribute' or `varying'");
3118 _mesa_glsl_error(loc
, state
,
3119 "`layout' qualifier may not be used with "
3120 "`attribute' or `varying'");
3124 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3125 * AMD_conservative_depth.
3127 int depth_layout_count
= qual
->flags
.q
.depth_any
3128 + qual
->flags
.q
.depth_greater
3129 + qual
->flags
.q
.depth_less
3130 + qual
->flags
.q
.depth_unchanged
;
3131 if (depth_layout_count
> 0
3132 && !state
->AMD_conservative_depth_enable
3133 && !state
->ARB_conservative_depth_enable
) {
3134 _mesa_glsl_error(loc
, state
,
3135 "extension GL_AMD_conservative_depth or "
3136 "GL_ARB_conservative_depth must be enabled "
3137 "to use depth layout qualifiers");
3138 } else if (depth_layout_count
> 0
3139 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3140 _mesa_glsl_error(loc
, state
,
3141 "depth layout qualifiers can be applied only to "
3143 } else if (depth_layout_count
> 1
3144 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3145 _mesa_glsl_error(loc
, state
,
3146 "at most one depth layout qualifier can be applied to "
3149 if (qual
->flags
.q
.depth_any
)
3150 var
->data
.depth_layout
= ir_depth_layout_any
;
3151 else if (qual
->flags
.q
.depth_greater
)
3152 var
->data
.depth_layout
= ir_depth_layout_greater
;
3153 else if (qual
->flags
.q
.depth_less
)
3154 var
->data
.depth_layout
= ir_depth_layout_less
;
3155 else if (qual
->flags
.q
.depth_unchanged
)
3156 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3158 var
->data
.depth_layout
= ir_depth_layout_none
;
3160 if (qual
->flags
.q
.std140
||
3161 qual
->flags
.q
.std430
||
3162 qual
->flags
.q
.packed
||
3163 qual
->flags
.q
.shared
) {
3164 _mesa_glsl_error(loc
, state
,
3165 "uniform and shader storage block layout qualifiers "
3166 "std140, std430, packed, and shared can only be "
3167 "applied to uniform or shader storage blocks, not "
3171 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3172 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3175 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3178 * "Fragment shaders also allow the following layout qualifier on in only
3179 * (not with variable declarations)
3180 * layout-qualifier-id
3181 * early_fragment_tests
3184 if (qual
->flags
.q
.early_fragment_tests
) {
3185 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3186 "valid in fragment shader input layout declaration.");
3191 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3193 struct _mesa_glsl_parse_state
*state
,
3197 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3199 if (qual
->flags
.q
.invariant
) {
3200 if (var
->data
.used
) {
3201 _mesa_glsl_error(loc
, state
,
3202 "variable `%s' may not be redeclared "
3203 "`invariant' after being used",
3206 var
->data
.invariant
= 1;
3210 if (qual
->flags
.q
.precise
) {
3211 if (var
->data
.used
) {
3212 _mesa_glsl_error(loc
, state
,
3213 "variable `%s' may not be redeclared "
3214 "`precise' after being used",
3217 var
->data
.precise
= 1;
3221 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3222 _mesa_glsl_error(loc
, state
,
3223 "`subroutine' may only be applied to uniforms, "
3224 "subroutine type declarations, or function definitions");
3227 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3228 || qual
->flags
.q
.uniform
3229 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3230 var
->data
.read_only
= 1;
3232 if (qual
->flags
.q
.centroid
)
3233 var
->data
.centroid
= 1;
3235 if (qual
->flags
.q
.sample
)
3236 var
->data
.sample
= 1;
3238 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3239 if (state
->es_shader
) {
3240 var
->data
.precision
=
3241 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3244 if (qual
->flags
.q
.patch
)
3245 var
->data
.patch
= 1;
3247 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3248 var
->type
= glsl_type::error_type
;
3249 _mesa_glsl_error(loc
, state
,
3250 "`attribute' variables may not be declared in the "
3252 _mesa_shader_stage_to_string(state
->stage
));
3255 /* Disallow layout qualifiers which may only appear on layout declarations. */
3256 if (qual
->flags
.q
.prim_type
) {
3257 _mesa_glsl_error(loc
, state
,
3258 "Primitive type may only be specified on GS input or output "
3259 "layout declaration, not on variables.");
3262 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3264 * "However, the const qualifier cannot be used with out or inout."
3266 * The same section of the GLSL 4.40 spec further clarifies this saying:
3268 * "The const qualifier cannot be used with out or inout, or a
3269 * compile-time error results."
3271 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3272 _mesa_glsl_error(loc
, state
,
3273 "`const' may not be applied to `out' or `inout' "
3274 "function parameters");
3277 /* If there is no qualifier that changes the mode of the variable, leave
3278 * the setting alone.
3280 assert(var
->data
.mode
!= ir_var_temporary
);
3281 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3282 var
->data
.mode
= ir_var_function_inout
;
3283 else if (qual
->flags
.q
.in
)
3284 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3285 else if (qual
->flags
.q
.attribute
3286 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3287 var
->data
.mode
= ir_var_shader_in
;
3288 else if (qual
->flags
.q
.out
)
3289 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3290 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3291 var
->data
.mode
= ir_var_shader_out
;
3292 else if (qual
->flags
.q
.uniform
)
3293 var
->data
.mode
= ir_var_uniform
;
3294 else if (qual
->flags
.q
.buffer
)
3295 var
->data
.mode
= ir_var_shader_storage
;
3296 else if (qual
->flags
.q
.shared_storage
)
3297 var
->data
.mode
= ir_var_shader_shared
;
3299 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3300 /* User-defined ins/outs are not permitted in compute shaders. */
3301 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3302 _mesa_glsl_error(loc
, state
,
3303 "user-defined input and output variables are not "
3304 "permitted in compute shaders");
3307 /* This variable is being used to link data between shader stages (in
3308 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3309 * that is allowed for such purposes.
3311 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3313 * "The varying qualifier can be used only with the data types
3314 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3317 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3318 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3320 * "Fragment inputs can only be signed and unsigned integers and
3321 * integer vectors, float, floating-point vectors, matrices, or
3322 * arrays of these. Structures cannot be input.
3324 * Similar text exists in the section on vertex shader outputs.
3326 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3327 * 3.00 spec allows structs as well. Varying structs are also allowed
3330 switch (var
->type
->get_scalar_type()->base_type
) {
3331 case GLSL_TYPE_FLOAT
:
3332 /* Ok in all GLSL versions */
3334 case GLSL_TYPE_UINT
:
3336 if (state
->is_version(130, 300))
3338 _mesa_glsl_error(loc
, state
,
3339 "varying variables must be of base type float in %s",
3340 state
->get_version_string());
3342 case GLSL_TYPE_STRUCT
:
3343 if (state
->is_version(150, 300))
3345 _mesa_glsl_error(loc
, state
,
3346 "varying variables may not be of type struct");
3348 case GLSL_TYPE_DOUBLE
:
3351 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3356 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3357 switch (state
->stage
) {
3358 case MESA_SHADER_VERTEX
:
3359 if (var
->data
.mode
== ir_var_shader_out
)
3360 var
->data
.invariant
= true;
3362 case MESA_SHADER_TESS_CTRL
:
3363 case MESA_SHADER_TESS_EVAL
:
3364 case MESA_SHADER_GEOMETRY
:
3365 if ((var
->data
.mode
== ir_var_shader_in
)
3366 || (var
->data
.mode
== ir_var_shader_out
))
3367 var
->data
.invariant
= true;
3369 case MESA_SHADER_FRAGMENT
:
3370 if (var
->data
.mode
== ir_var_shader_in
)
3371 var
->data
.invariant
= true;
3373 case MESA_SHADER_COMPUTE
:
3374 /* Invariance isn't meaningful in compute shaders. */
3379 var
->data
.interpolation
=
3380 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
3383 /* Does the declaration use the deprecated 'attribute' or 'varying'
3386 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3387 || qual
->flags
.q
.varying
;
3390 /* Validate auxiliary storage qualifiers */
3392 /* From section 4.3.4 of the GLSL 1.30 spec:
3393 * "It is an error to use centroid in in a vertex shader."
3395 * From section 4.3.4 of the GLSL ES 3.00 spec:
3396 * "It is an error to use centroid in or interpolation qualifiers in
3397 * a vertex shader input."
3400 /* Section 4.3.6 of the GLSL 1.30 specification states:
3401 * "It is an error to use centroid out in a fragment shader."
3403 * The GL_ARB_shading_language_420pack extension specification states:
3404 * "It is an error to use auxiliary storage qualifiers or interpolation
3405 * qualifiers on an output in a fragment shader."
3407 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3408 _mesa_glsl_error(loc
, state
,
3409 "sample qualifier may only be used on `in` or `out` "
3410 "variables between shader stages");
3412 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3413 _mesa_glsl_error(loc
, state
,
3414 "centroid qualifier may only be used with `in', "
3415 "`out' or `varying' variables between shader stages");
3418 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3419 _mesa_glsl_error(loc
, state
,
3420 "the shared storage qualifiers can only be used with "
3424 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3428 * Get the variable that is being redeclared by this declaration
3430 * Semantic checks to verify the validity of the redeclaration are also
3431 * performed. If semantic checks fail, compilation error will be emitted via
3432 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3435 * A pointer to an existing variable in the current scope if the declaration
3436 * is a redeclaration, \c NULL otherwise.
3438 static ir_variable
*
3439 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3440 struct _mesa_glsl_parse_state
*state
,
3441 bool allow_all_redeclarations
)
3443 /* Check if this declaration is actually a re-declaration, either to
3444 * resize an array or add qualifiers to an existing variable.
3446 * This is allowed for variables in the current scope, or when at
3447 * global scope (for built-ins in the implicit outer scope).
3449 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3450 if (earlier
== NULL
||
3451 (state
->current_function
!= NULL
&&
3452 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3457 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3459 * "It is legal to declare an array without a size and then
3460 * later re-declare the same name as an array of the same
3461 * type and specify a size."
3463 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3464 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3465 /* FINISHME: This doesn't match the qualifiers on the two
3466 * FINISHME: declarations. It's not 100% clear whether this is
3467 * FINISHME: required or not.
3470 const unsigned size
= unsigned(var
->type
->array_size());
3471 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3472 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3473 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3475 earlier
->data
.max_array_access
);
3478 earlier
->type
= var
->type
;
3481 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3482 state
->is_version(150, 0))
3483 && strcmp(var
->name
, "gl_FragCoord") == 0
3484 && earlier
->type
== var
->type
3485 && earlier
->data
.mode
== var
->data
.mode
) {
3486 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3489 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3490 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3492 /* According to section 4.3.7 of the GLSL 1.30 spec,
3493 * the following built-in varaibles can be redeclared with an
3494 * interpolation qualifier:
3497 * * gl_FrontSecondaryColor
3498 * * gl_BackSecondaryColor
3500 * * gl_SecondaryColor
3502 } else if (state
->is_version(130, 0)
3503 && (strcmp(var
->name
, "gl_FrontColor") == 0
3504 || strcmp(var
->name
, "gl_BackColor") == 0
3505 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3506 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3507 || strcmp(var
->name
, "gl_Color") == 0
3508 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3509 && earlier
->type
== var
->type
3510 && earlier
->data
.mode
== var
->data
.mode
) {
3511 earlier
->data
.interpolation
= var
->data
.interpolation
;
3513 /* Layout qualifiers for gl_FragDepth. */
3514 } else if ((state
->AMD_conservative_depth_enable
||
3515 state
->ARB_conservative_depth_enable
)
3516 && strcmp(var
->name
, "gl_FragDepth") == 0
3517 && earlier
->type
== var
->type
3518 && earlier
->data
.mode
== var
->data
.mode
) {
3520 /** From the AMD_conservative_depth spec:
3521 * Within any shader, the first redeclarations of gl_FragDepth
3522 * must appear before any use of gl_FragDepth.
3524 if (earlier
->data
.used
) {
3525 _mesa_glsl_error(&loc
, state
,
3526 "the first redeclaration of gl_FragDepth "
3527 "must appear before any use of gl_FragDepth");
3530 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3531 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3532 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3533 _mesa_glsl_error(&loc
, state
,
3534 "gl_FragDepth: depth layout is declared here "
3535 "as '%s, but it was previously declared as "
3537 depth_layout_string(var
->data
.depth_layout
),
3538 depth_layout_string(earlier
->data
.depth_layout
));
3541 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3543 } else if (allow_all_redeclarations
) {
3544 if (earlier
->data
.mode
!= var
->data
.mode
) {
3545 _mesa_glsl_error(&loc
, state
,
3546 "redeclaration of `%s' with incorrect qualifiers",
3548 } else if (earlier
->type
!= var
->type
) {
3549 _mesa_glsl_error(&loc
, state
,
3550 "redeclaration of `%s' has incorrect type",
3554 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3561 * Generate the IR for an initializer in a variable declaration
3564 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3565 ast_fully_specified_type
*type
,
3566 exec_list
*initializer_instructions
,
3567 struct _mesa_glsl_parse_state
*state
)
3569 ir_rvalue
*result
= NULL
;
3571 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3573 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3575 * "All uniform variables are read-only and are initialized either
3576 * directly by an application via API commands, or indirectly by
3579 if (var
->data
.mode
== ir_var_uniform
) {
3580 state
->check_version(120, 0, &initializer_loc
,
3581 "cannot initialize uniform %s",
3585 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3587 * "Buffer variables cannot have initializers."
3589 if (var
->data
.mode
== ir_var_shader_storage
) {
3590 _mesa_glsl_error(&initializer_loc
, state
,
3591 "cannot initialize buffer variable %s",
3595 /* From section 4.1.7 of the GLSL 4.40 spec:
3597 * "Opaque variables [...] are initialized only through the
3598 * OpenGL API; they cannot be declared with an initializer in a
3601 if (var
->type
->contains_opaque()) {
3602 _mesa_glsl_error(&initializer_loc
, state
,
3603 "cannot initialize opaque variable %s",
3607 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3608 _mesa_glsl_error(&initializer_loc
, state
,
3609 "cannot initialize %s shader input / %s %s",
3610 _mesa_shader_stage_to_string(state
->stage
),
3611 (state
->stage
== MESA_SHADER_VERTEX
)
3612 ? "attribute" : "varying",
3616 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
3617 _mesa_glsl_error(&initializer_loc
, state
,
3618 "cannot initialize %s shader output %s",
3619 _mesa_shader_stage_to_string(state
->stage
),
3623 /* If the initializer is an ast_aggregate_initializer, recursively store
3624 * type information from the LHS into it, so that its hir() function can do
3627 if (decl
->initializer
->oper
== ast_aggregate
)
3628 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3630 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3631 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3633 /* Calculate the constant value if this is a const or uniform
3636 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
3638 * "Declarations of globals without a storage qualifier, or with
3639 * just the const qualifier, may include initializers, in which case
3640 * they will be initialized before the first line of main() is
3641 * executed. Such initializers must be a constant expression."
3643 * The same section of the GLSL ES 3.00.4 spec has similar language.
3645 if (type
->qualifier
.flags
.q
.constant
3646 || type
->qualifier
.flags
.q
.uniform
3647 || (state
->es_shader
&& state
->current_function
== NULL
)) {
3648 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3650 if (new_rhs
!= NULL
) {
3653 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
3656 * "A constant expression is one of
3660 * - an expression formed by an operator on operands that are
3661 * all constant expressions, including getting an element of
3662 * a constant array, or a field of a constant structure, or
3663 * components of a constant vector. However, the sequence
3664 * operator ( , ) and the assignment operators ( =, +=, ...)
3665 * are not included in the operators that can create a
3666 * constant expression."
3668 * Section 12.43 (Sequence operator and constant expressions) says:
3670 * "Should the following construct be allowed?
3674 * The expression within the brackets uses the sequence operator
3675 * (',') and returns the integer 3 so the construct is declaring
3676 * a single-dimensional array of size 3. In some languages, the
3677 * construct declares a two-dimensional array. It would be
3678 * preferable to make this construct illegal to avoid confusion.
3680 * One possibility is to change the definition of the sequence
3681 * operator so that it does not return a constant-expression and
3682 * hence cannot be used to declare an array size.
3684 * RESOLUTION: The result of a sequence operator is not a
3685 * constant-expression."
3687 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
3688 * contains language almost identical to the section 4.3.3 in the
3689 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
3692 ir_constant
*constant_value
= rhs
->constant_expression_value();
3693 if (!constant_value
||
3694 (state
->is_version(430, 300) &&
3695 decl
->initializer
->has_sequence_subexpression())) {
3696 const char *const variable_mode
=
3697 (type
->qualifier
.flags
.q
.constant
)
3699 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
3701 /* If ARB_shading_language_420pack is enabled, initializers of
3702 * const-qualified local variables do not have to be constant
3703 * expressions. Const-qualified global variables must still be
3704 * initialized with constant expressions.
3706 if (!state
->ARB_shading_language_420pack_enable
3707 || state
->current_function
== NULL
) {
3708 _mesa_glsl_error(& initializer_loc
, state
,
3709 "initializer of %s variable `%s' must be a "
3710 "constant expression",
3713 if (var
->type
->is_numeric()) {
3714 /* Reduce cascading errors. */
3715 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3716 ? ir_constant::zero(state
, var
->type
) : NULL
;
3720 rhs
= constant_value
;
3721 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3722 ? constant_value
: NULL
;
3725 if (var
->type
->is_numeric()) {
3726 /* Reduce cascading errors. */
3727 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3728 ? ir_constant::zero(state
, var
->type
) : NULL
;
3733 if (rhs
&& !rhs
->type
->is_error()) {
3734 bool temp
= var
->data
.read_only
;
3735 if (type
->qualifier
.flags
.q
.constant
)
3736 var
->data
.read_only
= false;
3738 /* Never emit code to initialize a uniform.
3740 const glsl_type
*initializer_type
;
3741 if (!type
->qualifier
.flags
.q
.uniform
) {
3742 do_assignment(initializer_instructions
, state
,
3747 type
->get_location());
3748 initializer_type
= result
->type
;
3750 initializer_type
= rhs
->type
;
3752 var
->constant_initializer
= rhs
->constant_expression_value();
3753 var
->data
.has_initializer
= true;
3755 /* If the declared variable is an unsized array, it must inherrit
3756 * its full type from the initializer. A declaration such as
3758 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3762 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3764 * The assignment generated in the if-statement (below) will also
3765 * automatically handle this case for non-uniforms.
3767 * If the declared variable is not an array, the types must
3768 * already match exactly. As a result, the type assignment
3769 * here can be done unconditionally. For non-uniforms the call
3770 * to do_assignment can change the type of the initializer (via
3771 * the implicit conversion rules). For uniforms the initializer
3772 * must be a constant expression, and the type of that expression
3773 * was validated above.
3775 var
->type
= initializer_type
;
3777 var
->data
.read_only
= temp
;
3784 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3785 YYLTYPE loc
, ir_variable
*var
,
3786 unsigned num_vertices
,
3788 const char *var_category
)
3790 if (var
->type
->is_unsized_array()) {
3791 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3793 * All geometry shader input unsized array declarations will be
3794 * sized by an earlier input layout qualifier, when present, as per
3795 * the following table.
3797 * Followed by a table mapping each allowed input layout qualifier to
3798 * the corresponding input length.
3800 * Similarly for tessellation control shader outputs.
3802 if (num_vertices
!= 0)
3803 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3806 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3807 * includes the following examples of compile-time errors:
3809 * // code sequence within one shader...
3810 * in vec4 Color1[]; // size unknown
3811 * ...Color1.length()...// illegal, length() unknown
3812 * in vec4 Color2[2]; // size is 2
3813 * ...Color1.length()...// illegal, Color1 still has no size
3814 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3815 * layout(lines) in; // legal, input size is 2, matching
3816 * in vec4 Color4[3]; // illegal, contradicts layout
3819 * To detect the case illustrated by Color3, we verify that the size of
3820 * an explicitly-sized array matches the size of any previously declared
3821 * explicitly-sized array. To detect the case illustrated by Color4, we
3822 * verify that the size of an explicitly-sized array is consistent with
3823 * any previously declared input layout.
3825 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3826 _mesa_glsl_error(&loc
, state
,
3827 "%s size contradicts previously declared layout "
3828 "(size is %u, but layout requires a size of %u)",
3829 var_category
, var
->type
->length
, num_vertices
);
3830 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3831 _mesa_glsl_error(&loc
, state
,
3832 "%s sizes are inconsistent (size is %u, but a "
3833 "previous declaration has size %u)",
3834 var_category
, var
->type
->length
, *size
);
3836 *size
= var
->type
->length
;
3842 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3843 YYLTYPE loc
, ir_variable
*var
)
3845 unsigned num_vertices
= 0;
3847 if (state
->tcs_output_vertices_specified
) {
3848 num_vertices
= state
->out_qualifier
->vertices
;
3851 if (!var
->type
->is_array() && !var
->data
.patch
) {
3852 _mesa_glsl_error(&loc
, state
,
3853 "tessellation control shader outputs must be arrays");
3855 /* To avoid cascading failures, short circuit the checks below. */
3859 if (var
->data
.patch
)
3862 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3863 &state
->tcs_output_size
,
3864 "tessellation control shader output");
3868 * Do additional processing necessary for tessellation control/evaluation shader
3869 * input declarations. This covers both interface block arrays and bare input
3873 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3874 YYLTYPE loc
, ir_variable
*var
)
3876 if (!var
->type
->is_array() && !var
->data
.patch
) {
3877 _mesa_glsl_error(&loc
, state
,
3878 "per-vertex tessellation shader inputs must be arrays");
3879 /* Avoid cascading failures. */
3883 if (var
->data
.patch
)
3886 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
3887 if (var
->type
->is_unsized_array()) {
3888 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3889 state
->Const
.MaxPatchVertices
);
3895 * Do additional processing necessary for geometry shader input declarations
3896 * (this covers both interface blocks arrays and bare input variables).
3899 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3900 YYLTYPE loc
, ir_variable
*var
)
3902 unsigned num_vertices
= 0;
3904 if (state
->gs_input_prim_type_specified
) {
3905 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
3908 /* Geometry shader input variables must be arrays. Caller should have
3909 * reported an error for this.
3911 if (!var
->type
->is_array()) {
3912 assert(state
->error
);
3914 /* To avoid cascading failures, short circuit the checks below. */
3918 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3919 &state
->gs_input_size
,
3920 "geometry shader input");
3924 validate_identifier(const char *identifier
, YYLTYPE loc
,
3925 struct _mesa_glsl_parse_state
*state
)
3927 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3929 * "Identifiers starting with "gl_" are reserved for use by
3930 * OpenGL, and may not be declared in a shader as either a
3931 * variable or a function."
3933 if (is_gl_identifier(identifier
)) {
3934 _mesa_glsl_error(&loc
, state
,
3935 "identifier `%s' uses reserved `gl_' prefix",
3937 } else if (strstr(identifier
, "__")) {
3938 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3941 * "In addition, all identifiers containing two
3942 * consecutive underscores (__) are reserved as
3943 * possible future keywords."
3945 * The intention is that names containing __ are reserved for internal
3946 * use by the implementation, and names prefixed with GL_ are reserved
3947 * for use by Khronos. Names simply containing __ are dangerous to use,
3948 * but should be allowed.
3950 * A future version of the GLSL specification will clarify this.
3952 _mesa_glsl_warning(&loc
, state
,
3953 "identifier `%s' uses reserved `__' string",
3959 ast_declarator_list::hir(exec_list
*instructions
,
3960 struct _mesa_glsl_parse_state
*state
)
3963 const struct glsl_type
*decl_type
;
3964 const char *type_name
= NULL
;
3965 ir_rvalue
*result
= NULL
;
3966 YYLTYPE loc
= this->get_location();
3968 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
3970 * "To ensure that a particular output variable is invariant, it is
3971 * necessary to use the invariant qualifier. It can either be used to
3972 * qualify a previously declared variable as being invariant
3974 * invariant gl_Position; // make existing gl_Position be invariant"
3976 * In these cases the parser will set the 'invariant' flag in the declarator
3977 * list, and the type will be NULL.
3979 if (this->invariant
) {
3980 assert(this->type
== NULL
);
3982 if (state
->current_function
!= NULL
) {
3983 _mesa_glsl_error(& loc
, state
,
3984 "all uses of `invariant' keyword must be at global "
3988 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3989 assert(decl
->array_specifier
== NULL
);
3990 assert(decl
->initializer
== NULL
);
3992 ir_variable
*const earlier
=
3993 state
->symbols
->get_variable(decl
->identifier
);
3994 if (earlier
== NULL
) {
3995 _mesa_glsl_error(& loc
, state
,
3996 "undeclared variable `%s' cannot be marked "
3997 "invariant", decl
->identifier
);
3998 } else if (!is_varying_var(earlier
, state
->stage
)) {
3999 _mesa_glsl_error(&loc
, state
,
4000 "`%s' cannot be marked invariant; interfaces between "
4001 "shader stages only.", decl
->identifier
);
4002 } else if (earlier
->data
.used
) {
4003 _mesa_glsl_error(& loc
, state
,
4004 "variable `%s' may not be redeclared "
4005 "`invariant' after being used",
4008 earlier
->data
.invariant
= true;
4012 /* Invariant redeclarations do not have r-values.
4017 if (this->precise
) {
4018 assert(this->type
== NULL
);
4020 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4021 assert(decl
->array_specifier
== NULL
);
4022 assert(decl
->initializer
== NULL
);
4024 ir_variable
*const earlier
=
4025 state
->symbols
->get_variable(decl
->identifier
);
4026 if (earlier
== NULL
) {
4027 _mesa_glsl_error(& loc
, state
,
4028 "undeclared variable `%s' cannot be marked "
4029 "precise", decl
->identifier
);
4030 } else if (state
->current_function
!= NULL
&&
4031 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4032 /* Note: we have to check if we're in a function, since
4033 * builtins are treated as having come from another scope.
4035 _mesa_glsl_error(& loc
, state
,
4036 "variable `%s' from an outer scope may not be "
4037 "redeclared `precise' in this scope",
4039 } else if (earlier
->data
.used
) {
4040 _mesa_glsl_error(& loc
, state
,
4041 "variable `%s' may not be redeclared "
4042 "`precise' after being used",
4045 earlier
->data
.precise
= true;
4049 /* Precise redeclarations do not have r-values either. */
4053 assert(this->type
!= NULL
);
4054 assert(!this->invariant
);
4055 assert(!this->precise
);
4057 /* The type specifier may contain a structure definition. Process that
4058 * before any of the variable declarations.
4060 (void) this->type
->specifier
->hir(instructions
, state
);
4062 decl_type
= this->type
->glsl_type(& type_name
, state
);
4064 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4065 * "Buffer variables may only be declared inside interface blocks
4066 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4067 * shader storage blocks. It is a compile-time error to declare buffer
4068 * variables at global scope (outside a block)."
4070 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4071 _mesa_glsl_error(&loc
, state
,
4072 "buffer variables cannot be declared outside "
4073 "interface blocks");
4076 /* An offset-qualified atomic counter declaration sets the default
4077 * offset for the next declaration within the same atomic counter
4080 if (decl_type
&& decl_type
->contains_atomic()) {
4081 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4082 type
->qualifier
.flags
.q
.explicit_offset
)
4083 state
->atomic_counter_offsets
[type
->qualifier
.binding
] =
4084 type
->qualifier
.offset
;
4087 if (this->declarations
.is_empty()) {
4088 /* If there is no structure involved in the program text, there are two
4089 * possible scenarios:
4091 * - The program text contained something like 'vec4;'. This is an
4092 * empty declaration. It is valid but weird. Emit a warning.
4094 * - The program text contained something like 'S;' and 'S' is not the
4095 * name of a known structure type. This is both invalid and weird.
4098 * - The program text contained something like 'mediump float;'
4099 * when the programmer probably meant 'precision mediump
4100 * float;' Emit a warning with a description of what they
4101 * probably meant to do.
4103 * Note that if decl_type is NULL and there is a structure involved,
4104 * there must have been some sort of error with the structure. In this
4105 * case we assume that an error was already generated on this line of
4106 * code for the structure. There is no need to generate an additional,
4109 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4112 if (decl_type
== NULL
) {
4113 _mesa_glsl_error(&loc
, state
,
4114 "invalid type `%s' in empty declaration",
4116 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4117 /* Empty atomic counter declarations are allowed and useful
4118 * to set the default offset qualifier.
4121 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4122 if (this->type
->specifier
->structure
!= NULL
) {
4123 _mesa_glsl_error(&loc
, state
,
4124 "precision qualifiers can't be applied "
4127 static const char *const precision_names
[] = {
4134 _mesa_glsl_warning(&loc
, state
,
4135 "empty declaration with precision qualifier, "
4136 "to set the default precision, use "
4137 "`precision %s %s;'",
4138 precision_names
[this->type
->qualifier
.precision
],
4141 } else if (this->type
->specifier
->structure
== NULL
) {
4142 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4146 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4147 const struct glsl_type
*var_type
;
4149 const char *identifier
= decl
->identifier
;
4150 /* FINISHME: Emit a warning if a variable declaration shadows a
4151 * FINISHME: declaration at a higher scope.
4154 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4155 if (type_name
!= NULL
) {
4156 _mesa_glsl_error(& loc
, state
,
4157 "invalid type `%s' in declaration of `%s'",
4158 type_name
, decl
->identifier
);
4160 _mesa_glsl_error(& loc
, state
,
4161 "invalid type in declaration of `%s'",
4167 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4171 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4173 _mesa_glsl_error(& loc
, state
,
4174 "invalid type in declaration of `%s'",
4176 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4181 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4184 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4186 /* The 'varying in' and 'varying out' qualifiers can only be used with
4187 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4190 if (this->type
->qualifier
.flags
.q
.varying
) {
4191 if (this->type
->qualifier
.flags
.q
.in
) {
4192 _mesa_glsl_error(& loc
, state
,
4193 "`varying in' qualifier in declaration of "
4194 "`%s' only valid for geometry shaders using "
4195 "ARB_geometry_shader4 or EXT_geometry_shader4",
4197 } else if (this->type
->qualifier
.flags
.q
.out
) {
4198 _mesa_glsl_error(& loc
, state
,
4199 "`varying out' qualifier in declaration of "
4200 "`%s' only valid for geometry shaders using "
4201 "ARB_geometry_shader4 or EXT_geometry_shader4",
4206 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4208 * "Global variables can only use the qualifiers const,
4209 * attribute, uniform, or varying. Only one may be
4212 * Local variables can only use the qualifier const."
4214 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4215 * any extension that adds the 'layout' keyword.
4217 if (!state
->is_version(130, 300)
4218 && !state
->has_explicit_attrib_location()
4219 && !state
->has_separate_shader_objects()
4220 && !state
->ARB_fragment_coord_conventions_enable
) {
4221 if (this->type
->qualifier
.flags
.q
.out
) {
4222 _mesa_glsl_error(& loc
, state
,
4223 "`out' qualifier in declaration of `%s' "
4224 "only valid for function parameters in %s",
4225 decl
->identifier
, state
->get_version_string());
4227 if (this->type
->qualifier
.flags
.q
.in
) {
4228 _mesa_glsl_error(& loc
, state
,
4229 "`in' qualifier in declaration of `%s' "
4230 "only valid for function parameters in %s",
4231 decl
->identifier
, state
->get_version_string());
4233 /* FINISHME: Test for other invalid qualifiers. */
4236 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4238 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4241 if (this->type
->qualifier
.flags
.q
.invariant
) {
4242 if (!is_varying_var(var
, state
->stage
)) {
4243 _mesa_glsl_error(&loc
, state
,
4244 "`%s' cannot be marked invariant; interfaces between "
4245 "shader stages only", var
->name
);
4249 if (state
->current_function
!= NULL
) {
4250 const char *mode
= NULL
;
4251 const char *extra
= "";
4253 /* There is no need to check for 'inout' here because the parser will
4254 * only allow that in function parameter lists.
4256 if (this->type
->qualifier
.flags
.q
.attribute
) {
4258 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4259 mode
= "subroutine uniform";
4260 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4262 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4264 } else if (this->type
->qualifier
.flags
.q
.in
) {
4266 extra
= " or in function parameter list";
4267 } else if (this->type
->qualifier
.flags
.q
.out
) {
4269 extra
= " or in function parameter list";
4273 _mesa_glsl_error(& loc
, state
,
4274 "%s variable `%s' must be declared at "
4276 mode
, var
->name
, extra
);
4278 } else if (var
->data
.mode
== ir_var_shader_in
) {
4279 var
->data
.read_only
= true;
4281 if (state
->stage
== MESA_SHADER_VERTEX
) {
4282 bool error_emitted
= false;
4284 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4286 * "Vertex shader inputs can only be float, floating-point
4287 * vectors, matrices, signed and unsigned integers and integer
4288 * vectors. Vertex shader inputs can also form arrays of these
4289 * types, but not structures."
4291 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4293 * "Vertex shader inputs can only be float, floating-point
4294 * vectors, matrices, signed and unsigned integers and integer
4295 * vectors. They cannot be arrays or structures."
4297 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4299 * "The attribute qualifier can be used only with float,
4300 * floating-point vectors, and matrices. Attribute variables
4301 * cannot be declared as arrays or structures."
4303 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4305 * "Vertex shader inputs can only be float, floating-point
4306 * vectors, matrices, signed and unsigned integers and integer
4307 * vectors. Vertex shader inputs cannot be arrays or
4310 const glsl_type
*check_type
= var
->type
->without_array();
4312 switch (check_type
->base_type
) {
4313 case GLSL_TYPE_FLOAT
:
4315 case GLSL_TYPE_UINT
:
4317 if (state
->is_version(120, 300))
4319 case GLSL_TYPE_DOUBLE
:
4320 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4324 _mesa_glsl_error(& loc
, state
,
4325 "vertex shader input / attribute cannot have "
4327 var
->type
->is_array() ? "array of " : "",
4329 error_emitted
= true;
4332 if (!error_emitted
&& var
->type
->is_array() &&
4333 !state
->check_version(150, 0, &loc
,
4334 "vertex shader input / attribute "
4335 "cannot have array type")) {
4336 error_emitted
= true;
4338 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4339 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4341 * Geometry shader input variables get the per-vertex values
4342 * written out by vertex shader output variables of the same
4343 * names. Since a geometry shader operates on a set of
4344 * vertices, each input varying variable (or input block, see
4345 * interface blocks below) needs to be declared as an array.
4347 if (!var
->type
->is_array()) {
4348 _mesa_glsl_error(&loc
, state
,
4349 "geometry shader inputs must be arrays");
4352 handle_geometry_shader_input_decl(state
, loc
, var
);
4353 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4354 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4356 * It is a compile-time error to declare a fragment shader
4357 * input with, or that contains, any of the following types:
4361 * * An array of arrays
4362 * * An array of structures
4363 * * A structure containing an array
4364 * * A structure containing a structure
4366 if (state
->es_shader
) {
4367 const glsl_type
*check_type
= var
->type
->without_array();
4368 if (check_type
->is_boolean() ||
4369 check_type
->contains_opaque()) {
4370 _mesa_glsl_error(&loc
, state
,
4371 "fragment shader input cannot have type %s",
4374 if (var
->type
->is_array() &&
4375 var
->type
->fields
.array
->is_array()) {
4376 _mesa_glsl_error(&loc
, state
,
4378 "cannot have an array of arrays",
4379 _mesa_shader_stage_to_string(state
->stage
));
4381 if (var
->type
->is_array() &&
4382 var
->type
->fields
.array
->is_record()) {
4383 _mesa_glsl_error(&loc
, state
,
4384 "fragment shader input "
4385 "cannot have an array of structs");
4387 if (var
->type
->is_record()) {
4388 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4389 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4390 var
->type
->fields
.structure
[i
].type
->is_record())
4391 _mesa_glsl_error(&loc
, state
,
4392 "fragement shader input cannot have "
4393 "a struct that contains an "
4398 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4399 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4400 handle_tess_shader_input_decl(state
, loc
, var
);
4402 } else if (var
->data
.mode
== ir_var_shader_out
) {
4403 const glsl_type
*check_type
= var
->type
->without_array();
4405 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4407 * It is a compile-time error to declare a vertex, tessellation
4408 * evaluation, tessellation control, or geometry shader output
4409 * that contains any of the following:
4411 * * A Boolean type (bool, bvec2 ...)
4414 if (check_type
->is_boolean() || check_type
->contains_opaque())
4415 _mesa_glsl_error(&loc
, state
,
4416 "%s shader output cannot have type %s",
4417 _mesa_shader_stage_to_string(state
->stage
),
4420 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4422 * It is a compile-time error to declare a fragment shader output
4423 * that contains any of the following:
4425 * * A Boolean type (bool, bvec2 ...)
4426 * * A double-precision scalar or vector (double, dvec2 ...)
4431 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4432 if (check_type
->is_record() || check_type
->is_matrix())
4433 _mesa_glsl_error(&loc
, state
,
4434 "fragment shader output "
4435 "cannot have struct or matrix type");
4436 switch (check_type
->base_type
) {
4437 case GLSL_TYPE_UINT
:
4439 case GLSL_TYPE_FLOAT
:
4442 _mesa_glsl_error(&loc
, state
,
4443 "fragment shader output cannot have "
4444 "type %s", check_type
->name
);
4448 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4450 * It is a compile-time error to declare a vertex shader output
4451 * with, or that contains, any of the following types:
4455 * * An array of arrays
4456 * * An array of structures
4457 * * A structure containing an array
4458 * * A structure containing a structure
4460 * It is a compile-time error to declare a fragment shader output
4461 * with, or that contains, any of the following types:
4467 * * An array of array
4469 if (state
->es_shader
) {
4470 if (var
->type
->is_array() &&
4471 var
->type
->fields
.array
->is_array()) {
4472 _mesa_glsl_error(&loc
, state
,
4474 "cannot have an array of arrays",
4475 _mesa_shader_stage_to_string(state
->stage
));
4477 if (state
->stage
== MESA_SHADER_VERTEX
) {
4478 if (var
->type
->is_array() &&
4479 var
->type
->fields
.array
->is_record()) {
4480 _mesa_glsl_error(&loc
, state
,
4481 "vertex shader output "
4482 "cannot have an array of structs");
4484 if (var
->type
->is_record()) {
4485 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4486 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4487 var
->type
->fields
.structure
[i
].type
->is_record())
4488 _mesa_glsl_error(&loc
, state
,
4489 "vertex shader output cannot have a "
4490 "struct that contains an "
4497 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4498 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4500 } else if (var
->type
->contains_subroutine()) {
4501 /* declare subroutine uniforms as hidden */
4502 var
->data
.how_declared
= ir_var_hidden
;
4505 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4506 * so must integer vertex outputs.
4508 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4509 * "Fragment shader inputs that are signed or unsigned integers or
4510 * integer vectors must be qualified with the interpolation qualifier
4513 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4514 * "Fragment shader inputs that are, or contain, signed or unsigned
4515 * integers or integer vectors must be qualified with the
4516 * interpolation qualifier flat."
4518 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4519 * "Vertex shader outputs that are, or contain, signed or unsigned
4520 * integers or integer vectors must be qualified with the
4521 * interpolation qualifier flat."
4523 * Note that prior to GLSL 1.50, this requirement applied to vertex
4524 * outputs rather than fragment inputs. That creates problems in the
4525 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4526 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4527 * apply the restriction to both vertex outputs and fragment inputs.
4529 * Note also that the desktop GLSL specs are missing the text "or
4530 * contain"; this is presumably an oversight, since there is no
4531 * reasonable way to interpolate a fragment shader input that contains
4534 if (state
->is_version(130, 300) &&
4535 var
->type
->contains_integer() &&
4536 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4537 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4538 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4539 && state
->es_shader
))) {
4540 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4541 "vertex output" : "fragment input";
4542 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4543 "an integer, then it must be qualified with 'flat'",
4547 /* Double fragment inputs must be qualified with 'flat'. */
4548 if (var
->type
->contains_double() &&
4549 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4550 state
->stage
== MESA_SHADER_FRAGMENT
&&
4551 var
->data
.mode
== ir_var_shader_in
) {
4552 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4553 "a double, then it must be qualified with 'flat'",
4557 /* Interpolation qualifiers cannot be applied to 'centroid' and
4558 * 'centroid varying'.
4560 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4561 * "interpolation qualifiers may only precede the qualifiers in,
4562 * centroid in, out, or centroid out in a declaration. They do not apply
4563 * to the deprecated storage qualifiers varying or centroid varying."
4565 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4567 if (state
->is_version(130, 0)
4568 && this->type
->qualifier
.has_interpolation()
4569 && this->type
->qualifier
.flags
.q
.varying
) {
4571 const char *i
= this->type
->qualifier
.interpolation_string();
4574 if (this->type
->qualifier
.flags
.q
.centroid
)
4575 s
= "centroid varying";
4579 _mesa_glsl_error(&loc
, state
,
4580 "qualifier '%s' cannot be applied to the "
4581 "deprecated storage qualifier '%s'", i
, s
);
4585 /* Interpolation qualifiers can only apply to vertex shader outputs and
4586 * fragment shader inputs.
4588 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4589 * "Outputs from a vertex shader (out) and inputs to a fragment
4590 * shader (in) can be further qualified with one or more of these
4591 * interpolation qualifiers"
4593 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4594 * "These interpolation qualifiers may only precede the qualifiers
4595 * in, centroid in, out, or centroid out in a declaration. They do
4596 * not apply to inputs into a vertex shader or outputs from a
4599 if (state
->is_version(130, 300)
4600 && this->type
->qualifier
.has_interpolation()) {
4602 const char *i
= this->type
->qualifier
.interpolation_string();
4605 switch (state
->stage
) {
4606 case MESA_SHADER_VERTEX
:
4607 if (this->type
->qualifier
.flags
.q
.in
) {
4608 _mesa_glsl_error(&loc
, state
,
4609 "qualifier '%s' cannot be applied to vertex "
4610 "shader inputs", i
);
4613 case MESA_SHADER_FRAGMENT
:
4614 if (this->type
->qualifier
.flags
.q
.out
) {
4615 _mesa_glsl_error(&loc
, state
,
4616 "qualifier '%s' cannot be applied to fragment "
4617 "shader outputs", i
);
4626 /* From section 4.3.4 of the GLSL 4.00 spec:
4627 * "Input variables may not be declared using the patch in qualifier
4628 * in tessellation control or geometry shaders."
4630 * From section 4.3.6 of the GLSL 4.00 spec:
4631 * "It is an error to use patch out in a vertex, tessellation
4632 * evaluation, or geometry shader."
4634 * This doesn't explicitly forbid using them in a fragment shader, but
4635 * that's probably just an oversight.
4637 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4638 && this->type
->qualifier
.flags
.q
.patch
4639 && this->type
->qualifier
.flags
.q
.in
) {
4641 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4642 "tessellation evaluation shader");
4645 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4646 && this->type
->qualifier
.flags
.q
.patch
4647 && this->type
->qualifier
.flags
.q
.out
) {
4649 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4650 "tessellation control shader");
4653 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4655 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4656 state
->check_precision_qualifiers_allowed(&loc
);
4660 /* If a precision qualifier is allowed on a type, it is allowed on
4661 * an array of that type.
4663 if (!(this->type
->qualifier
.precision
== ast_precision_none
4664 || precision_qualifier_allowed(var
->type
->without_array()))) {
4666 _mesa_glsl_error(&loc
, state
,
4667 "precision qualifiers apply only to floating point"
4668 ", integer and opaque types");
4671 /* From section 4.1.7 of the GLSL 4.40 spec:
4673 * "[Opaque types] can only be declared as function
4674 * parameters or uniform-qualified variables."
4676 if (var_type
->contains_opaque() &&
4677 !this->type
->qualifier
.flags
.q
.uniform
) {
4678 _mesa_glsl_error(&loc
, state
,
4679 "opaque variables must be declared uniform");
4682 /* Process the initializer and add its instructions to a temporary
4683 * list. This list will be added to the instruction stream (below) after
4684 * the declaration is added. This is done because in some cases (such as
4685 * redeclarations) the declaration may not actually be added to the
4686 * instruction stream.
4688 exec_list initializer_instructions
;
4690 /* Examine var name here since var may get deleted in the next call */
4691 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4693 ir_variable
*earlier
=
4694 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4695 false /* allow_all_redeclarations */);
4696 if (earlier
!= NULL
) {
4698 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4699 _mesa_glsl_error(&loc
, state
,
4700 "`%s' has already been redeclared using "
4701 "gl_PerVertex", earlier
->name
);
4703 earlier
->data
.how_declared
= ir_var_declared_normally
;
4706 if (decl
->initializer
!= NULL
) {
4707 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4709 &initializer_instructions
, state
);
4711 validate_array_dimensions(var_type
, state
, &loc
);
4714 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4716 * "It is an error to write to a const variable outside of
4717 * its declaration, so they must be initialized when
4720 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4721 _mesa_glsl_error(& loc
, state
,
4722 "const declaration of `%s' must be initialized",
4726 if (state
->es_shader
) {
4727 const glsl_type
*const t
= (earlier
== NULL
)
4728 ? var
->type
: earlier
->type
;
4730 if (t
->is_unsized_array())
4731 /* Section 10.17 of the GLSL ES 1.00 specification states that
4732 * unsized array declarations have been removed from the language.
4733 * Arrays that are sized using an initializer are still explicitly
4734 * sized. However, GLSL ES 1.00 does not allow array
4735 * initializers. That is only allowed in GLSL ES 3.00.
4737 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4739 * "An array type can also be formed without specifying a size
4740 * if the definition includes an initializer:
4742 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4743 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4748 _mesa_glsl_error(& loc
, state
,
4749 "unsized array declarations are not allowed in "
4753 /* If the declaration is not a redeclaration, there are a few additional
4754 * semantic checks that must be applied. In addition, variable that was
4755 * created for the declaration should be added to the IR stream.
4757 if (earlier
== NULL
) {
4758 validate_identifier(decl
->identifier
, loc
, state
);
4760 /* Add the variable to the symbol table. Note that the initializer's
4761 * IR was already processed earlier (though it hasn't been emitted
4762 * yet), without the variable in scope.
4764 * This differs from most C-like languages, but it follows the GLSL
4765 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4768 * "Within a declaration, the scope of a name starts immediately
4769 * after the initializer if present or immediately after the name
4770 * being declared if not."
4772 if (!state
->symbols
->add_variable(var
)) {
4773 YYLTYPE loc
= this->get_location();
4774 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4775 "current scope", decl
->identifier
);
4779 /* Push the variable declaration to the top. It means that all the
4780 * variable declarations will appear in a funny last-to-first order,
4781 * but otherwise we run into trouble if a function is prototyped, a
4782 * global var is decled, then the function is defined with usage of
4783 * the global var. See glslparsertest's CorrectModule.frag.
4785 instructions
->push_head(var
);
4788 instructions
->append_list(&initializer_instructions
);
4792 /* Generally, variable declarations do not have r-values. However,
4793 * one is used for the declaration in
4795 * while (bool b = some_condition()) {
4799 * so we return the rvalue from the last seen declaration here.
4806 ast_parameter_declarator::hir(exec_list
*instructions
,
4807 struct _mesa_glsl_parse_state
*state
)
4810 const struct glsl_type
*type
;
4811 const char *name
= NULL
;
4812 YYLTYPE loc
= this->get_location();
4814 type
= this->type
->glsl_type(& name
, state
);
4818 _mesa_glsl_error(& loc
, state
,
4819 "invalid type `%s' in declaration of `%s'",
4820 name
, this->identifier
);
4822 _mesa_glsl_error(& loc
, state
,
4823 "invalid type in declaration of `%s'",
4827 type
= glsl_type::error_type
;
4830 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4832 * "Functions that accept no input arguments need not use void in the
4833 * argument list because prototypes (or definitions) are required and
4834 * therefore there is no ambiguity when an empty argument list "( )" is
4835 * declared. The idiom "(void)" as a parameter list is provided for
4838 * Placing this check here prevents a void parameter being set up
4839 * for a function, which avoids tripping up checks for main taking
4840 * parameters and lookups of an unnamed symbol.
4842 if (type
->is_void()) {
4843 if (this->identifier
!= NULL
)
4844 _mesa_glsl_error(& loc
, state
,
4845 "named parameter cannot have type `void'");
4851 if (formal_parameter
&& (this->identifier
== NULL
)) {
4852 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4856 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4857 * call already handled the "vec4[..] foo" case.
4859 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4861 if (!type
->is_error() && type
->is_unsized_array()) {
4862 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4864 type
= glsl_type::error_type
;
4868 ir_variable
*var
= new(ctx
)
4869 ir_variable(type
, this->identifier
, ir_var_function_in
);
4871 /* Apply any specified qualifiers to the parameter declaration. Note that
4872 * for function parameters the default mode is 'in'.
4874 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
4877 /* From section 4.1.7 of the GLSL 4.40 spec:
4879 * "Opaque variables cannot be treated as l-values; hence cannot
4880 * be used as out or inout function parameters, nor can they be
4883 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4884 && type
->contains_opaque()) {
4885 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
4886 "contain opaque variables");
4887 type
= glsl_type::error_type
;
4890 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
4892 * "When calling a function, expressions that do not evaluate to
4893 * l-values cannot be passed to parameters declared as out or inout."
4895 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
4897 * "Other binary or unary expressions, non-dereferenced arrays,
4898 * function names, swizzles with repeated fields, and constants
4899 * cannot be l-values."
4901 * So for GLSL 1.10, passing an array as an out or inout parameter is not
4902 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
4904 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4906 && !state
->check_version(120, 100, &loc
,
4907 "arrays cannot be out or inout parameters")) {
4908 type
= glsl_type::error_type
;
4911 instructions
->push_tail(var
);
4913 /* Parameter declarations do not have r-values.
4920 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
4922 exec_list
*ir_parameters
,
4923 _mesa_glsl_parse_state
*state
)
4925 ast_parameter_declarator
*void_param
= NULL
;
4928 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
4929 param
->formal_parameter
= formal
;
4930 param
->hir(ir_parameters
, state
);
4938 if ((void_param
!= NULL
) && (count
> 1)) {
4939 YYLTYPE loc
= void_param
->get_location();
4941 _mesa_glsl_error(& loc
, state
,
4942 "`void' parameter must be only parameter");
4948 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
4950 /* IR invariants disallow function declarations or definitions
4951 * nested within other function definitions. But there is no
4952 * requirement about the relative order of function declarations
4953 * and definitions with respect to one another. So simply insert
4954 * the new ir_function block at the end of the toplevel instruction
4957 state
->toplevel_ir
->push_tail(f
);
4962 ast_function::hir(exec_list
*instructions
,
4963 struct _mesa_glsl_parse_state
*state
)
4966 ir_function
*f
= NULL
;
4967 ir_function_signature
*sig
= NULL
;
4968 exec_list hir_parameters
;
4969 YYLTYPE loc
= this->get_location();
4971 const char *const name
= identifier
;
4973 /* New functions are always added to the top-level IR instruction stream,
4974 * so this instruction list pointer is ignored. See also emit_function
4977 (void) instructions
;
4979 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
4981 * "Function declarations (prototypes) cannot occur inside of functions;
4982 * they must be at global scope, or for the built-in functions, outside
4983 * the global scope."
4985 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
4987 * "User defined functions may only be defined within the global scope."
4989 * Note that this language does not appear in GLSL 1.10.
4991 if ((state
->current_function
!= NULL
) &&
4992 state
->is_version(120, 100)) {
4993 YYLTYPE loc
= this->get_location();
4994 _mesa_glsl_error(&loc
, state
,
4995 "declaration of function `%s' not allowed within "
4996 "function body", name
);
4999 validate_identifier(name
, this->get_location(), state
);
5001 /* Convert the list of function parameters to HIR now so that they can be
5002 * used below to compare this function's signature with previously seen
5003 * signatures for functions with the same name.
5005 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5007 & hir_parameters
, state
);
5009 const char *return_type_name
;
5010 const glsl_type
*return_type
=
5011 this->return_type
->glsl_type(& return_type_name
, state
);
5014 YYLTYPE loc
= this->get_location();
5015 _mesa_glsl_error(&loc
, state
,
5016 "function `%s' has undeclared return type `%s'",
5017 name
, return_type_name
);
5018 return_type
= glsl_type::error_type
;
5021 /* ARB_shader_subroutine states:
5022 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5023 * subroutine(...) to a function declaration."
5025 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5026 YYLTYPE loc
= this->get_location();
5027 _mesa_glsl_error(&loc
, state
,
5028 "function declaration `%s' cannot have subroutine prepended",
5032 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5033 * "No qualifier is allowed on the return type of a function."
5035 if (this->return_type
->has_qualifiers()) {
5036 YYLTYPE loc
= this->get_location();
5037 _mesa_glsl_error(& loc
, state
,
5038 "function `%s' return type has qualifiers", name
);
5041 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5043 * "Arrays are allowed as arguments and as the return type. In both
5044 * cases, the array must be explicitly sized."
5046 if (return_type
->is_unsized_array()) {
5047 YYLTYPE loc
= this->get_location();
5048 _mesa_glsl_error(& loc
, state
,
5049 "function `%s' return type array must be explicitly "
5053 /* From section 4.1.7 of the GLSL 4.40 spec:
5055 * "[Opaque types] can only be declared as function parameters
5056 * or uniform-qualified variables."
5058 if (return_type
->contains_opaque()) {
5059 YYLTYPE loc
= this->get_location();
5060 _mesa_glsl_error(&loc
, state
,
5061 "function `%s' return type can't contain an opaque type",
5065 /* Create an ir_function if one doesn't already exist. */
5066 f
= state
->symbols
->get_function(name
);
5068 f
= new(ctx
) ir_function(name
);
5069 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5070 if (!state
->symbols
->add_function(f
)) {
5071 /* This function name shadows a non-function use of the same name. */
5072 YYLTYPE loc
= this->get_location();
5073 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5074 "non-function", name
);
5078 emit_function(state
, f
);
5081 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5083 * "A shader cannot redefine or overload built-in functions."
5085 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5087 * "User code can overload the built-in functions but cannot redefine
5090 if (state
->es_shader
&& state
->language_version
>= 300) {
5091 /* Local shader has no exact candidates; check the built-ins. */
5092 _mesa_glsl_initialize_builtin_functions();
5093 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5094 YYLTYPE loc
= this->get_location();
5095 _mesa_glsl_error(& loc
, state
,
5096 "A shader cannot redefine or overload built-in "
5097 "function `%s' in GLSL ES 3.00", name
);
5102 /* Verify that this function's signature either doesn't match a previously
5103 * seen signature for a function with the same name, or, if a match is found,
5104 * that the previously seen signature does not have an associated definition.
5106 if (state
->es_shader
|| f
->has_user_signature()) {
5107 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5109 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5110 if (badvar
!= NULL
) {
5111 YYLTYPE loc
= this->get_location();
5113 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5114 "qualifiers don't match prototype", name
, badvar
);
5117 if (sig
->return_type
!= return_type
) {
5118 YYLTYPE loc
= this->get_location();
5120 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5121 "match prototype", name
);
5124 if (sig
->is_defined
) {
5125 if (is_definition
) {
5126 YYLTYPE loc
= this->get_location();
5127 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5129 /* We just encountered a prototype that exactly matches a
5130 * function that's already been defined. This is redundant,
5131 * and we should ignore it.
5139 /* Verify the return type of main() */
5140 if (strcmp(name
, "main") == 0) {
5141 if (! return_type
->is_void()) {
5142 YYLTYPE loc
= this->get_location();
5144 _mesa_glsl_error(& loc
, state
, "main() must return void");
5147 if (!hir_parameters
.is_empty()) {
5148 YYLTYPE loc
= this->get_location();
5150 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5154 /* Finish storing the information about this new function in its signature.
5157 sig
= new(ctx
) ir_function_signature(return_type
);
5158 f
->add_signature(sig
);
5161 sig
->replace_parameters(&hir_parameters
);
5164 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5167 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5168 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5169 f
->num_subroutine_types
);
5171 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5172 const struct glsl_type
*type
;
5173 /* the subroutine type must be already declared */
5174 type
= state
->symbols
->get_type(decl
->identifier
);
5176 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5178 f
->subroutine_types
[idx
++] = type
;
5180 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5182 state
->num_subroutines
+ 1);
5183 state
->subroutines
[state
->num_subroutines
] = f
;
5184 state
->num_subroutines
++;
5188 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5189 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5190 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5193 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5195 state
->num_subroutine_types
+ 1);
5196 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5197 state
->num_subroutine_types
++;
5199 f
->is_subroutine
= true;
5202 /* Function declarations (prototypes) do not have r-values.
5209 ast_function_definition::hir(exec_list
*instructions
,
5210 struct _mesa_glsl_parse_state
*state
)
5212 prototype
->is_definition
= true;
5213 prototype
->hir(instructions
, state
);
5215 ir_function_signature
*signature
= prototype
->signature
;
5216 if (signature
== NULL
)
5219 assert(state
->current_function
== NULL
);
5220 state
->current_function
= signature
;
5221 state
->found_return
= false;
5223 /* Duplicate parameters declared in the prototype as concrete variables.
5224 * Add these to the symbol table.
5226 state
->symbols
->push_scope();
5227 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5228 assert(var
->as_variable() != NULL
);
5230 /* The only way a parameter would "exist" is if two parameters have
5233 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5234 YYLTYPE loc
= this->get_location();
5236 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5238 state
->symbols
->add_variable(var
);
5242 /* Convert the body of the function to HIR. */
5243 this->body
->hir(&signature
->body
, state
);
5244 signature
->is_defined
= true;
5246 state
->symbols
->pop_scope();
5248 assert(state
->current_function
== signature
);
5249 state
->current_function
= NULL
;
5251 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5252 YYLTYPE loc
= this->get_location();
5253 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5254 "%s, but no return statement",
5255 signature
->function_name(),
5256 signature
->return_type
->name
);
5259 /* Function definitions do not have r-values.
5266 ast_jump_statement::hir(exec_list
*instructions
,
5267 struct _mesa_glsl_parse_state
*state
)
5274 assert(state
->current_function
);
5276 if (opt_return_value
) {
5277 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5279 /* The value of the return type can be NULL if the shader says
5280 * 'return foo();' and foo() is a function that returns void.
5282 * NOTE: The GLSL spec doesn't say that this is an error. The type
5283 * of the return value is void. If the return type of the function is
5284 * also void, then this should compile without error. Seriously.
5286 const glsl_type
*const ret_type
=
5287 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5289 /* Implicit conversions are not allowed for return values prior to
5290 * ARB_shading_language_420pack.
5292 if (state
->current_function
->return_type
!= ret_type
) {
5293 YYLTYPE loc
= this->get_location();
5295 if (state
->ARB_shading_language_420pack_enable
) {
5296 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5298 _mesa_glsl_error(& loc
, state
,
5299 "could not implicitly convert return value "
5300 "to %s, in function `%s'",
5301 state
->current_function
->return_type
->name
,
5302 state
->current_function
->function_name());
5305 _mesa_glsl_error(& loc
, state
,
5306 "`return' with wrong type %s, in function `%s' "
5309 state
->current_function
->function_name(),
5310 state
->current_function
->return_type
->name
);
5312 } else if (state
->current_function
->return_type
->base_type
==
5314 YYLTYPE loc
= this->get_location();
5316 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5317 * specs add a clarification:
5319 * "A void function can only use return without a return argument, even if
5320 * the return argument has void type. Return statements only accept values:
5323 * void func2() { return func1(); } // illegal return statement"
5325 _mesa_glsl_error(& loc
, state
,
5326 "void functions can only use `return' without a "
5330 inst
= new(ctx
) ir_return(ret
);
5332 if (state
->current_function
->return_type
->base_type
!=
5334 YYLTYPE loc
= this->get_location();
5336 _mesa_glsl_error(& loc
, state
,
5337 "`return' with no value, in function %s returning "
5339 state
->current_function
->function_name());
5341 inst
= new(ctx
) ir_return
;
5344 state
->found_return
= true;
5345 instructions
->push_tail(inst
);
5350 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5351 YYLTYPE loc
= this->get_location();
5353 _mesa_glsl_error(& loc
, state
,
5354 "`discard' may only appear in a fragment shader");
5356 instructions
->push_tail(new(ctx
) ir_discard
);
5361 if (mode
== ast_continue
&&
5362 state
->loop_nesting_ast
== NULL
) {
5363 YYLTYPE loc
= this->get_location();
5365 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5366 } else if (mode
== ast_break
&&
5367 state
->loop_nesting_ast
== NULL
&&
5368 state
->switch_state
.switch_nesting_ast
== NULL
) {
5369 YYLTYPE loc
= this->get_location();
5371 _mesa_glsl_error(& loc
, state
,
5372 "break may only appear in a loop or a switch");
5374 /* For a loop, inline the for loop expression again, since we don't
5375 * know where near the end of the loop body the normal copy of it is
5376 * going to be placed. Same goes for the condition for a do-while
5379 if (state
->loop_nesting_ast
!= NULL
&&
5380 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5381 if (state
->loop_nesting_ast
->rest_expression
) {
5382 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5385 if (state
->loop_nesting_ast
->mode
==
5386 ast_iteration_statement::ast_do_while
) {
5387 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5391 if (state
->switch_state
.is_switch_innermost
&&
5392 mode
== ast_continue
) {
5393 /* Set 'continue_inside' to true. */
5394 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5395 ir_dereference_variable
*deref_continue_inside_var
=
5396 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5397 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5400 /* Break out from the switch, continue for the loop will
5401 * be called right after switch. */
5402 ir_loop_jump
*const jump
=
5403 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5404 instructions
->push_tail(jump
);
5406 } else if (state
->switch_state
.is_switch_innermost
&&
5407 mode
== ast_break
) {
5408 /* Force break out of switch by inserting a break. */
5409 ir_loop_jump
*const jump
=
5410 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5411 instructions
->push_tail(jump
);
5413 ir_loop_jump
*const jump
=
5414 new(ctx
) ir_loop_jump((mode
== ast_break
)
5415 ? ir_loop_jump::jump_break
5416 : ir_loop_jump::jump_continue
);
5417 instructions
->push_tail(jump
);
5424 /* Jump instructions do not have r-values.
5431 ast_selection_statement::hir(exec_list
*instructions
,
5432 struct _mesa_glsl_parse_state
*state
)
5436 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5438 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5440 * "Any expression whose type evaluates to a Boolean can be used as the
5441 * conditional expression bool-expression. Vector types are not accepted
5442 * as the expression to if."
5444 * The checks are separated so that higher quality diagnostics can be
5445 * generated for cases where both rules are violated.
5447 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5448 YYLTYPE loc
= this->condition
->get_location();
5450 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5454 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5456 if (then_statement
!= NULL
) {
5457 state
->symbols
->push_scope();
5458 then_statement
->hir(& stmt
->then_instructions
, state
);
5459 state
->symbols
->pop_scope();
5462 if (else_statement
!= NULL
) {
5463 state
->symbols
->push_scope();
5464 else_statement
->hir(& stmt
->else_instructions
, state
);
5465 state
->symbols
->pop_scope();
5468 instructions
->push_tail(stmt
);
5470 /* if-statements do not have r-values.
5477 ast_switch_statement::hir(exec_list
*instructions
,
5478 struct _mesa_glsl_parse_state
*state
)
5482 ir_rvalue
*const test_expression
=
5483 this->test_expression
->hir(instructions
, state
);
5485 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5487 * "The type of init-expression in a switch statement must be a
5490 if (!test_expression
->type
->is_scalar() ||
5491 !test_expression
->type
->is_integer()) {
5492 YYLTYPE loc
= this->test_expression
->get_location();
5494 _mesa_glsl_error(& loc
,
5496 "switch-statement expression must be scalar "
5500 /* Track the switch-statement nesting in a stack-like manner.
5502 struct glsl_switch_state saved
= state
->switch_state
;
5504 state
->switch_state
.is_switch_innermost
= true;
5505 state
->switch_state
.switch_nesting_ast
= this;
5506 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5507 hash_table_pointer_compare
);
5508 state
->switch_state
.previous_default
= NULL
;
5510 /* Initalize is_fallthru state to false.
5512 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5513 state
->switch_state
.is_fallthru_var
=
5514 new(ctx
) ir_variable(glsl_type::bool_type
,
5515 "switch_is_fallthru_tmp",
5517 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5519 ir_dereference_variable
*deref_is_fallthru_var
=
5520 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5521 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5524 /* Initialize continue_inside state to false.
5526 state
->switch_state
.continue_inside
=
5527 new(ctx
) ir_variable(glsl_type::bool_type
,
5528 "continue_inside_tmp",
5530 instructions
->push_tail(state
->switch_state
.continue_inside
);
5532 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5533 ir_dereference_variable
*deref_continue_inside_var
=
5534 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5535 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5538 state
->switch_state
.run_default
=
5539 new(ctx
) ir_variable(glsl_type::bool_type
,
5542 instructions
->push_tail(state
->switch_state
.run_default
);
5544 /* Loop around the switch is used for flow control. */
5545 ir_loop
* loop
= new(ctx
) ir_loop();
5546 instructions
->push_tail(loop
);
5548 /* Cache test expression.
5550 test_to_hir(&loop
->body_instructions
, state
);
5552 /* Emit code for body of switch stmt.
5554 body
->hir(&loop
->body_instructions
, state
);
5556 /* Insert a break at the end to exit loop. */
5557 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5558 loop
->body_instructions
.push_tail(jump
);
5560 /* If we are inside loop, check if continue got called inside switch. */
5561 if (state
->loop_nesting_ast
!= NULL
) {
5562 ir_dereference_variable
*deref_continue_inside
=
5563 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5564 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5565 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5567 if (state
->loop_nesting_ast
!= NULL
) {
5568 if (state
->loop_nesting_ast
->rest_expression
) {
5569 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5572 if (state
->loop_nesting_ast
->mode
==
5573 ast_iteration_statement::ast_do_while
) {
5574 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5577 irif
->then_instructions
.push_tail(jump
);
5578 instructions
->push_tail(irif
);
5581 hash_table_dtor(state
->switch_state
.labels_ht
);
5583 state
->switch_state
= saved
;
5585 /* Switch statements do not have r-values. */
5591 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5592 struct _mesa_glsl_parse_state
*state
)
5596 /* Cache value of test expression. */
5597 ir_rvalue
*const test_val
=
5598 test_expression
->hir(instructions
,
5601 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5604 ir_dereference_variable
*deref_test_var
=
5605 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5607 instructions
->push_tail(state
->switch_state
.test_var
);
5608 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5613 ast_switch_body::hir(exec_list
*instructions
,
5614 struct _mesa_glsl_parse_state
*state
)
5617 stmts
->hir(instructions
, state
);
5619 /* Switch bodies do not have r-values. */
5624 ast_case_statement_list::hir(exec_list
*instructions
,
5625 struct _mesa_glsl_parse_state
*state
)
5627 exec_list default_case
, after_default
, tmp
;
5629 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5630 case_stmt
->hir(&tmp
, state
);
5633 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5634 default_case
.append_list(&tmp
);
5638 /* If default case found, append 'after_default' list. */
5639 if (!default_case
.is_empty())
5640 after_default
.append_list(&tmp
);
5642 instructions
->append_list(&tmp
);
5645 /* Handle the default case. This is done here because default might not be
5646 * the last case. We need to add checks against following cases first to see
5647 * if default should be chosen or not.
5649 if (!default_case
.is_empty()) {
5651 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5652 ir_dereference_variable
*deref_run_default_var
=
5653 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5655 /* Choose to run default case initially, following conditional
5656 * assignments might change this.
5658 ir_assignment
*const init_var
=
5659 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5660 instructions
->push_tail(init_var
);
5662 /* Default case was the last one, no checks required. */
5663 if (after_default
.is_empty()) {
5664 instructions
->append_list(&default_case
);
5668 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5669 ir_assignment
*assign
= ir
->as_assignment();
5674 /* Clone the check between case label and init expression. */
5675 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5676 ir_expression
*clone
= exp
->clone(state
, NULL
);
5678 ir_dereference_variable
*deref_var
=
5679 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5680 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5682 ir_assignment
*const set_false
=
5683 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5685 instructions
->push_tail(set_false
);
5688 /* Append default case and all cases after it. */
5689 instructions
->append_list(&default_case
);
5690 instructions
->append_list(&after_default
);
5693 /* Case statements do not have r-values. */
5698 ast_case_statement::hir(exec_list
*instructions
,
5699 struct _mesa_glsl_parse_state
*state
)
5701 labels
->hir(instructions
, state
);
5703 /* Guard case statements depending on fallthru state. */
5704 ir_dereference_variable
*const deref_fallthru_guard
=
5705 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5706 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5708 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5709 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5711 instructions
->push_tail(test_fallthru
);
5713 /* Case statements do not have r-values. */
5719 ast_case_label_list::hir(exec_list
*instructions
,
5720 struct _mesa_glsl_parse_state
*state
)
5722 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5723 label
->hir(instructions
, state
);
5725 /* Case labels do not have r-values. */
5730 ast_case_label::hir(exec_list
*instructions
,
5731 struct _mesa_glsl_parse_state
*state
)
5735 ir_dereference_variable
*deref_fallthru_var
=
5736 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5738 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5740 /* If not default case, ... */
5741 if (this->test_value
!= NULL
) {
5742 /* Conditionally set fallthru state based on
5743 * comparison of cached test expression value to case label.
5745 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5746 ir_constant
*label_const
= label_rval
->constant_expression_value();
5749 YYLTYPE loc
= this->test_value
->get_location();
5751 _mesa_glsl_error(& loc
, state
,
5752 "switch statement case label must be a "
5753 "constant expression");
5755 /* Stuff a dummy value in to allow processing to continue. */
5756 label_const
= new(ctx
) ir_constant(0);
5758 ast_expression
*previous_label
= (ast_expression
*)
5759 hash_table_find(state
->switch_state
.labels_ht
,
5760 (void *)(uintptr_t)label_const
->value
.u
[0]);
5762 if (previous_label
) {
5763 YYLTYPE loc
= this->test_value
->get_location();
5764 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5766 loc
= previous_label
->get_location();
5767 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5769 hash_table_insert(state
->switch_state
.labels_ht
,
5771 (void *)(uintptr_t)label_const
->value
.u
[0]);
5775 ir_dereference_variable
*deref_test_var
=
5776 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5778 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5783 * From GLSL 4.40 specification section 6.2 ("Selection"):
5785 * "The type of the init-expression value in a switch statement must
5786 * be a scalar int or uint. The type of the constant-expression value
5787 * in a case label also must be a scalar int or uint. When any pair
5788 * of these values is tested for "equal value" and the types do not
5789 * match, an implicit conversion will be done to convert the int to a
5790 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5793 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5794 YYLTYPE loc
= this->test_value
->get_location();
5796 const glsl_type
*type_a
= label_const
->type
;
5797 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5799 /* Check if int->uint implicit conversion is supported. */
5800 bool integer_conversion_supported
=
5801 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5804 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5805 !integer_conversion_supported
) {
5806 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
5807 "init-expression and case label (%s != %s)",
5808 type_a
->name
, type_b
->name
);
5810 /* Conversion of the case label. */
5811 if (type_a
->base_type
== GLSL_TYPE_INT
) {
5812 if (!apply_implicit_conversion(glsl_type::uint_type
,
5813 test_cond
->operands
[0], state
))
5814 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5816 /* Conversion of the init-expression value. */
5817 if (!apply_implicit_conversion(glsl_type::uint_type
,
5818 test_cond
->operands
[1], state
))
5819 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5824 ir_assignment
*set_fallthru_on_test
=
5825 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5827 instructions
->push_tail(set_fallthru_on_test
);
5828 } else { /* default case */
5829 if (state
->switch_state
.previous_default
) {
5830 YYLTYPE loc
= this->get_location();
5831 _mesa_glsl_error(& loc
, state
,
5832 "multiple default labels in one switch");
5834 loc
= state
->switch_state
.previous_default
->get_location();
5835 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5837 state
->switch_state
.previous_default
= this;
5839 /* Set fallthru condition on 'run_default' bool. */
5840 ir_dereference_variable
*deref_run_default
=
5841 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5842 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5843 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5847 /* Set falltrhu state. */
5848 ir_assignment
*set_fallthru
=
5849 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5851 instructions
->push_tail(set_fallthru
);
5854 /* Case statements do not have r-values. */
5859 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
5860 struct _mesa_glsl_parse_state
*state
)
5864 if (condition
!= NULL
) {
5865 ir_rvalue
*const cond
=
5866 condition
->hir(instructions
, state
);
5869 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
5870 YYLTYPE loc
= condition
->get_location();
5872 _mesa_glsl_error(& loc
, state
,
5873 "loop condition must be scalar boolean");
5875 /* As the first code in the loop body, generate a block that looks
5876 * like 'if (!condition) break;' as the loop termination condition.
5878 ir_rvalue
*const not_cond
=
5879 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
5881 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
5883 ir_jump
*const break_stmt
=
5884 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5886 if_stmt
->then_instructions
.push_tail(break_stmt
);
5887 instructions
->push_tail(if_stmt
);
5894 ast_iteration_statement::hir(exec_list
*instructions
,
5895 struct _mesa_glsl_parse_state
*state
)
5899 /* For-loops and while-loops start a new scope, but do-while loops do not.
5901 if (mode
!= ast_do_while
)
5902 state
->symbols
->push_scope();
5904 if (init_statement
!= NULL
)
5905 init_statement
->hir(instructions
, state
);
5907 ir_loop
*const stmt
= new(ctx
) ir_loop();
5908 instructions
->push_tail(stmt
);
5910 /* Track the current loop nesting. */
5911 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
5913 state
->loop_nesting_ast
= this;
5915 /* Likewise, indicate that following code is closest to a loop,
5916 * NOT closest to a switch.
5918 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
5919 state
->switch_state
.is_switch_innermost
= false;
5921 if (mode
!= ast_do_while
)
5922 condition_to_hir(&stmt
->body_instructions
, state
);
5925 body
->hir(& stmt
->body_instructions
, state
);
5927 if (rest_expression
!= NULL
)
5928 rest_expression
->hir(& stmt
->body_instructions
, state
);
5930 if (mode
== ast_do_while
)
5931 condition_to_hir(&stmt
->body_instructions
, state
);
5933 if (mode
!= ast_do_while
)
5934 state
->symbols
->pop_scope();
5936 /* Restore previous nesting before returning. */
5937 state
->loop_nesting_ast
= nesting_ast
;
5938 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
5940 /* Loops do not have r-values.
5947 * Determine if the given type is valid for establishing a default precision
5950 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
5952 * "The precision statement
5954 * precision precision-qualifier type;
5956 * can be used to establish a default precision qualifier. The type field
5957 * can be either int or float or any of the sampler types, and the
5958 * precision-qualifier can be lowp, mediump, or highp."
5960 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
5961 * qualifiers on sampler types, but this seems like an oversight (since the
5962 * intention of including these in GLSL 1.30 is to allow compatibility with ES
5963 * shaders). So we allow int, float, and all sampler types regardless of GLSL
5967 is_valid_default_precision_type(const struct glsl_type
*const type
)
5972 switch (type
->base_type
) {
5974 case GLSL_TYPE_FLOAT
:
5975 /* "int" and "float" are valid, but vectors and matrices are not. */
5976 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
5977 case GLSL_TYPE_SAMPLER
:
5978 case GLSL_TYPE_IMAGE
:
5979 case GLSL_TYPE_ATOMIC_UINT
:
5988 ast_type_specifier::hir(exec_list
*instructions
,
5989 struct _mesa_glsl_parse_state
*state
)
5991 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
5994 YYLTYPE loc
= this->get_location();
5996 /* If this is a precision statement, check that the type to which it is
5997 * applied is either float or int.
5999 * From section 4.5.3 of the GLSL 1.30 spec:
6000 * "The precision statement
6001 * precision precision-qualifier type;
6002 * can be used to establish a default precision qualifier. The type
6003 * field can be either int or float [...]. Any other types or
6004 * qualifiers will result in an error.
6006 if (this->default_precision
!= ast_precision_none
) {
6007 if (!state
->check_precision_qualifiers_allowed(&loc
))
6010 if (this->structure
!= NULL
) {
6011 _mesa_glsl_error(&loc
, state
,
6012 "precision qualifiers do not apply to structures");
6016 if (this->array_specifier
!= NULL
) {
6017 _mesa_glsl_error(&loc
, state
,
6018 "default precision statements do not apply to "
6023 const struct glsl_type
*const type
=
6024 state
->symbols
->get_type(this->type_name
);
6025 if (!is_valid_default_precision_type(type
)) {
6026 _mesa_glsl_error(&loc
, state
,
6027 "default precision statements apply only to "
6028 "float, int, and opaque types");
6032 if (state
->es_shader
) {
6033 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6036 * "Non-precision qualified declarations will use the precision
6037 * qualifier specified in the most recent precision statement
6038 * that is still in scope. The precision statement has the same
6039 * scoping rules as variable declarations. If it is declared
6040 * inside a compound statement, its effect stops at the end of
6041 * the innermost statement it was declared in. Precision
6042 * statements in nested scopes override precision statements in
6043 * outer scopes. Multiple precision statements for the same basic
6044 * type can appear inside the same scope, with later statements
6045 * overriding earlier statements within that scope."
6047 * Default precision specifications follow the same scope rules as
6048 * variables. So, we can track the state of the default precision
6049 * qualifiers in the symbol table, and the rules will just work. This
6050 * is a slight abuse of the symbol table, but it has the semantics
6053 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6054 this->default_precision
);
6057 /* FINISHME: Translate precision statements into IR. */
6061 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6062 * process_record_constructor() can do type-checking on C-style initializer
6063 * expressions of structs, but ast_struct_specifier should only be translated
6064 * to HIR if it is declaring the type of a structure.
6066 * The ->is_declaration field is false for initializers of variables
6067 * declared separately from the struct's type definition.
6069 * struct S { ... }; (is_declaration = true)
6070 * struct T { ... } t = { ... }; (is_declaration = true)
6071 * S s = { ... }; (is_declaration = false)
6073 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6074 return this->structure
->hir(instructions
, state
);
6081 * Process a structure or interface block tree into an array of structure fields
6083 * After parsing, where there are some syntax differnces, structures and
6084 * interface blocks are almost identical. They are similar enough that the
6085 * AST for each can be processed the same way into a set of
6086 * \c glsl_struct_field to describe the members.
6088 * If we're processing an interface block, var_mode should be the type of the
6089 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6090 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6094 * The number of fields processed. A pointer to the array structure fields is
6095 * stored in \c *fields_ret.
6098 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6099 struct _mesa_glsl_parse_state
*state
,
6100 exec_list
*declarations
,
6101 glsl_struct_field
**fields_ret
,
6103 enum glsl_matrix_layout matrix_layout
,
6104 bool allow_reserved_names
,
6105 ir_variable_mode var_mode
,
6106 ast_type_qualifier
*layout
,
6107 unsigned block_stream
)
6109 unsigned decl_count
= 0;
6111 /* Make an initial pass over the list of fields to determine how
6112 * many there are. Each element in this list is an ast_declarator_list.
6113 * This means that we actually need to count the number of elements in the
6114 * 'declarations' list in each of the elements.
6116 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6117 decl_count
+= decl_list
->declarations
.length();
6120 /* Allocate storage for the fields and process the field
6121 * declarations. As the declarations are processed, try to also convert
6122 * the types to HIR. This ensures that structure definitions embedded in
6123 * other structure definitions or in interface blocks are processed.
6125 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6129 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6130 const char *type_name
;
6131 YYLTYPE loc
= decl_list
->get_location();
6133 decl_list
->type
->specifier
->hir(instructions
, state
);
6135 /* Section 10.9 of the GLSL ES 1.00 specification states that
6136 * embedded structure definitions have been removed from the language.
6138 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
6139 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
6140 "not allowed in GLSL ES 1.00");
6143 const glsl_type
*decl_type
=
6144 decl_list
->type
->glsl_type(& type_name
, state
);
6146 const struct ast_type_qualifier
*const qual
=
6147 &decl_list
->type
->qualifier
;
6149 /* From section 4.3.9 of the GLSL 4.40 spec:
6151 * "[In interface blocks] opaque types are not allowed."
6153 * It should be impossible for decl_type to be NULL here. Cases that
6154 * might naturally lead to decl_type being NULL, especially for the
6155 * is_interface case, will have resulted in compilation having
6156 * already halted due to a syntax error.
6160 if (is_interface
&& decl_type
->contains_opaque()) {
6161 _mesa_glsl_error(&loc
, state
,
6162 "uniform/buffer in non-default interface block contains "
6166 if (decl_type
->contains_atomic()) {
6167 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6169 * "Members of structures cannot be declared as atomic counter
6172 _mesa_glsl_error(&loc
, state
, "atomic counter in structure, "
6173 "shader storage block or uniform block");
6176 if (decl_type
->contains_image()) {
6177 /* FINISHME: Same problem as with atomic counters.
6178 * FINISHME: Request clarification from Khronos and add
6179 * FINISHME: spec quotation here.
6181 _mesa_glsl_error(&loc
, state
,
6182 "image in structure, shader storage block or "
6186 if (qual
->flags
.q
.explicit_binding
) {
6187 _mesa_glsl_error(&loc
, state
,
6188 "binding layout qualifier cannot be applied "
6189 "to struct or interface block members");
6192 if (qual
->flags
.q
.std140
||
6193 qual
->flags
.q
.std430
||
6194 qual
->flags
.q
.packed
||
6195 qual
->flags
.q
.shared
) {
6196 _mesa_glsl_error(&loc
, state
,
6197 "uniform/shader storage block layout qualifiers "
6198 "std140, std430, packed, and shared can only be "
6199 "applied to uniform/shader storage blocks, not "
6203 if (qual
->flags
.q
.constant
) {
6204 _mesa_glsl_error(&loc
, state
,
6205 "const storage qualifier cannot be applied "
6206 "to struct or interface block members");
6209 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6211 * "A block member may be declared with a stream identifier, but
6212 * the specified stream must match the stream associated with the
6213 * containing block."
6215 if (qual
->flags
.q
.explicit_stream
) {
6216 unsigned qual_stream
;
6217 if (process_qualifier_constant(state
, &loc
, "stream",
6218 qual
->stream
, &qual_stream
) &&
6219 qual_stream
!= block_stream
) {
6220 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6221 "interface block member does not match "
6222 "the interface block (%d vs %d)", qual
->stream
,
6227 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6228 _mesa_glsl_error(&loc
, state
,
6229 "interpolation qualifiers cannot be used "
6230 "with uniform interface blocks");
6233 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6234 qual
->has_auxiliary_storage()) {
6235 _mesa_glsl_error(&loc
, state
,
6236 "auxiliary storage qualifiers cannot be used "
6237 "in uniform blocks or structures.");
6240 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6241 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6242 _mesa_glsl_error(&loc
, state
,
6243 "row_major and column_major can only be "
6244 "applied to interface blocks");
6246 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6249 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6250 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6251 "readonly and writeonly.");
6254 foreach_list_typed (ast_declaration
, decl
, link
,
6255 &decl_list
->declarations
) {
6256 YYLTYPE loc
= decl
->get_location();
6258 if (!allow_reserved_names
)
6259 validate_identifier(decl
->identifier
, loc
, state
);
6261 const struct glsl_type
*field_type
=
6262 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6263 validate_array_dimensions(field_type
, state
, &loc
);
6264 fields
[i
].type
= field_type
;
6265 fields
[i
].name
= decl
->identifier
;
6266 fields
[i
].location
= -1;
6267 fields
[i
].interpolation
=
6268 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
6269 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6270 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6271 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6272 fields
[i
].precision
= qual
->precision
;
6274 /* Propogate row- / column-major information down the fields of the
6275 * structure or interface block. Structures need this data because
6276 * the structure may contain a structure that contains ... a matrix
6277 * that need the proper layout.
6279 if (field_type
->without_array()->is_matrix()
6280 || field_type
->without_array()->is_record()) {
6281 /* If no layout is specified for the field, inherit the layout
6284 fields
[i
].matrix_layout
= matrix_layout
;
6286 if (qual
->flags
.q
.row_major
)
6287 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6288 else if (qual
->flags
.q
.column_major
)
6289 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6291 /* If we're processing an interface block, the matrix layout must
6292 * be decided by this point.
6294 assert(!is_interface
6295 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6296 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6299 /* Image qualifiers are allowed on buffer variables, which can only
6300 * be defined inside shader storage buffer objects
6302 if (layout
&& var_mode
== ir_var_shader_storage
) {
6303 /* For readonly and writeonly qualifiers the field definition,
6304 * if set, overwrites the layout qualifier.
6306 if (qual
->flags
.q
.read_only
) {
6307 fields
[i
].image_read_only
= true;
6308 fields
[i
].image_write_only
= false;
6309 } else if (qual
->flags
.q
.write_only
) {
6310 fields
[i
].image_read_only
= false;
6311 fields
[i
].image_write_only
= true;
6313 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6314 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6317 /* For other qualifiers, we set the flag if either the layout
6318 * qualifier or the field qualifier are set
6320 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6321 layout
->flags
.q
.coherent
;
6322 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6323 layout
->flags
.q
._volatile
;
6324 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6325 layout
->flags
.q
.restrict_flag
;
6332 assert(i
== decl_count
);
6334 *fields_ret
= fields
;
6340 ast_struct_specifier::hir(exec_list
*instructions
,
6341 struct _mesa_glsl_parse_state
*state
)
6343 YYLTYPE loc
= this->get_location();
6345 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6347 * "Anonymous structures are not supported; so embedded structures must
6348 * have a declarator. A name given to an embedded struct is scoped at
6349 * the same level as the struct it is embedded in."
6351 * The same section of the GLSL 1.20 spec says:
6353 * "Anonymous structures are not supported. Embedded structures are not
6356 * struct S { float f; };
6358 * S; // Error: anonymous structures disallowed
6359 * struct { ... }; // Error: embedded structures disallowed
6360 * S s; // Okay: nested structures with name are allowed
6363 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
6364 * we allow embedded structures in 1.10 only.
6366 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
6367 _mesa_glsl_error(&loc
, state
,
6368 "embedded structure declarations are not allowed");
6370 state
->struct_specifier_depth
++;
6372 glsl_struct_field
*fields
;
6373 unsigned decl_count
=
6374 ast_process_struct_or_iface_block_members(instructions
,
6376 &this->declarations
,
6379 GLSL_MATRIX_LAYOUT_INHERITED
,
6380 false /* allow_reserved_names */,
6383 0 /* for interface only */);
6385 validate_identifier(this->name
, loc
, state
);
6387 const glsl_type
*t
=
6388 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6390 if (!state
->symbols
->add_type(name
, t
)) {
6391 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6393 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6395 state
->num_user_structures
+ 1);
6397 s
[state
->num_user_structures
] = t
;
6398 state
->user_structures
= s
;
6399 state
->num_user_structures
++;
6403 state
->struct_specifier_depth
--;
6405 /* Structure type definitions do not have r-values.
6412 * Visitor class which detects whether a given interface block has been used.
6414 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6417 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6418 : mode(mode
), block(block
), found(false)
6422 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6424 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6428 return visit_continue
;
6431 bool usage_found() const
6437 ir_variable_mode mode
;
6438 const glsl_type
*block
;
6443 is_unsized_array_last_element(ir_variable
*v
)
6445 const glsl_type
*interface_type
= v
->get_interface_type();
6446 int length
= interface_type
->length
;
6448 assert(v
->type
->is_unsized_array());
6450 /* Check if it is the last element of the interface */
6451 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6457 ast_interface_block::hir(exec_list
*instructions
,
6458 struct _mesa_glsl_parse_state
*state
)
6460 YYLTYPE loc
= this->get_location();
6462 /* Interface blocks must be declared at global scope */
6463 if (state
->current_function
!= NULL
) {
6464 _mesa_glsl_error(&loc
, state
,
6465 "Interface block `%s' must be declared "
6470 if (!this->layout
.flags
.q
.buffer
&&
6471 this->layout
.flags
.q
.std430
) {
6472 _mesa_glsl_error(&loc
, state
,
6473 "std430 storage block layout qualifier is supported "
6474 "only for shader storage blocks");
6477 /* The ast_interface_block has a list of ast_declarator_lists. We
6478 * need to turn those into ir_variables with an association
6479 * with this uniform block.
6481 enum glsl_interface_packing packing
;
6482 if (this->layout
.flags
.q
.shared
) {
6483 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6484 } else if (this->layout
.flags
.q
.packed
) {
6485 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6486 } else if (this->layout
.flags
.q
.std430
) {
6487 packing
= GLSL_INTERFACE_PACKING_STD430
;
6489 /* The default layout is std140.
6491 packing
= GLSL_INTERFACE_PACKING_STD140
;
6494 ir_variable_mode var_mode
;
6495 const char *iface_type_name
;
6496 if (this->layout
.flags
.q
.in
) {
6497 var_mode
= ir_var_shader_in
;
6498 iface_type_name
= "in";
6499 } else if (this->layout
.flags
.q
.out
) {
6500 var_mode
= ir_var_shader_out
;
6501 iface_type_name
= "out";
6502 } else if (this->layout
.flags
.q
.uniform
) {
6503 var_mode
= ir_var_uniform
;
6504 iface_type_name
= "uniform";
6505 } else if (this->layout
.flags
.q
.buffer
) {
6506 var_mode
= ir_var_shader_storage
;
6507 iface_type_name
= "buffer";
6509 var_mode
= ir_var_auto
;
6510 iface_type_name
= "UNKNOWN";
6511 assert(!"interface block layout qualifier not found!");
6514 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6515 if (this->layout
.flags
.q
.row_major
)
6516 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6517 else if (this->layout
.flags
.q
.column_major
)
6518 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6520 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6521 exec_list declared_variables
;
6522 glsl_struct_field
*fields
;
6524 /* Treat an interface block as one level of nesting, so that embedded struct
6525 * specifiers will be disallowed.
6527 state
->struct_specifier_depth
++;
6529 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
6530 * that we don't have incompatible qualifiers
6532 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
6533 _mesa_glsl_error(&loc
, state
,
6534 "Interface block sets both readonly and writeonly");
6537 unsigned qual_stream
;
6538 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
6540 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
6541 /* If the stream qualifier is invalid it doesn't make sense to continue
6542 * on and try to compare stream layouts on member variables against it
6543 * so just return early.
6548 unsigned int num_variables
=
6549 ast_process_struct_or_iface_block_members(&declared_variables
,
6551 &this->declarations
,
6555 redeclaring_per_vertex
,
6560 state
->struct_specifier_depth
--;
6562 if (!redeclaring_per_vertex
) {
6563 validate_identifier(this->block_name
, loc
, state
);
6565 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
6567 * "Block names have no other use within a shader beyond interface
6568 * matching; it is a compile-time error to use a block name at global
6569 * scope for anything other than as a block name."
6571 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
6572 if (var
&& !var
->type
->is_interface()) {
6573 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
6574 "already used in the scope.",
6579 const glsl_type
*earlier_per_vertex
= NULL
;
6580 if (redeclaring_per_vertex
) {
6581 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
6582 * the named interface block gl_in, we can find it by looking at the
6583 * previous declaration of gl_in. Otherwise we can find it by looking
6584 * at the previous decalartion of any of the built-in outputs,
6587 * Also check that the instance name and array-ness of the redeclaration
6591 case ir_var_shader_in
:
6592 if (ir_variable
*earlier_gl_in
=
6593 state
->symbols
->get_variable("gl_in")) {
6594 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6596 _mesa_glsl_error(&loc
, state
,
6597 "redeclaration of gl_PerVertex input not allowed "
6599 _mesa_shader_stage_to_string(state
->stage
));
6601 if (this->instance_name
== NULL
||
6602 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
6603 !this->array_specifier
->is_single_dimension()) {
6604 _mesa_glsl_error(&loc
, state
,
6605 "gl_PerVertex input must be redeclared as "
6609 case ir_var_shader_out
:
6610 if (ir_variable
*earlier_gl_Position
=
6611 state
->symbols
->get_variable("gl_Position")) {
6612 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6613 } else if (ir_variable
*earlier_gl_out
=
6614 state
->symbols
->get_variable("gl_out")) {
6615 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6617 _mesa_glsl_error(&loc
, state
,
6618 "redeclaration of gl_PerVertex output not "
6619 "allowed in the %s shader",
6620 _mesa_shader_stage_to_string(state
->stage
));
6622 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6623 if (this->instance_name
== NULL
||
6624 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6625 _mesa_glsl_error(&loc
, state
,
6626 "gl_PerVertex output must be redeclared as "
6630 if (this->instance_name
!= NULL
) {
6631 _mesa_glsl_error(&loc
, state
,
6632 "gl_PerVertex output may not be redeclared with "
6633 "an instance name");
6638 _mesa_glsl_error(&loc
, state
,
6639 "gl_PerVertex must be declared as an input or an "
6644 if (earlier_per_vertex
== NULL
) {
6645 /* An error has already been reported. Bail out to avoid null
6646 * dereferences later in this function.
6651 /* Copy locations from the old gl_PerVertex interface block. */
6652 for (unsigned i
= 0; i
< num_variables
; i
++) {
6653 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6655 _mesa_glsl_error(&loc
, state
,
6656 "redeclaration of gl_PerVertex must be a subset "
6657 "of the built-in members of gl_PerVertex");
6659 fields
[i
].location
=
6660 earlier_per_vertex
->fields
.structure
[j
].location
;
6661 fields
[i
].interpolation
=
6662 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6663 fields
[i
].centroid
=
6664 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6666 earlier_per_vertex
->fields
.structure
[j
].sample
;
6668 earlier_per_vertex
->fields
.structure
[j
].patch
;
6669 fields
[i
].precision
=
6670 earlier_per_vertex
->fields
.structure
[j
].precision
;
6674 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
6677 * If a built-in interface block is redeclared, it must appear in
6678 * the shader before any use of any member included in the built-in
6679 * declaration, or a compilation error will result.
6681 * This appears to be a clarification to the behaviour established for
6682 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
6683 * regardless of GLSL version.
6685 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
6686 v
.run(instructions
);
6687 if (v
.usage_found()) {
6688 _mesa_glsl_error(&loc
, state
,
6689 "redeclaration of a built-in interface block must "
6690 "appear before any use of any member of the "
6695 const glsl_type
*block_type
=
6696 glsl_type::get_interface_instance(fields
,
6701 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
6702 YYLTYPE loc
= this->get_location();
6703 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
6704 "already taken in the current scope",
6705 this->block_name
, iface_type_name
);
6708 /* Since interface blocks cannot contain statements, it should be
6709 * impossible for the block to generate any instructions.
6711 assert(declared_variables
.is_empty());
6713 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
6715 * Geometry shader input variables get the per-vertex values written
6716 * out by vertex shader output variables of the same names. Since a
6717 * geometry shader operates on a set of vertices, each input varying
6718 * variable (or input block, see interface blocks below) needs to be
6719 * declared as an array.
6721 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
6722 var_mode
== ir_var_shader_in
) {
6723 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
6724 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6725 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
6726 this->array_specifier
== NULL
&&
6727 var_mode
== ir_var_shader_in
) {
6728 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
6729 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
6730 this->array_specifier
== NULL
&&
6731 var_mode
== ir_var_shader_out
) {
6732 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
6736 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
6739 * "If an instance name (instance-name) is used, then it puts all the
6740 * members inside a scope within its own name space, accessed with the
6741 * field selector ( . ) operator (analogously to structures)."
6743 if (this->instance_name
) {
6744 if (redeclaring_per_vertex
) {
6745 /* When a built-in in an unnamed interface block is redeclared,
6746 * get_variable_being_redeclared() calls
6747 * check_builtin_array_max_size() to make sure that built-in array
6748 * variables aren't redeclared to illegal sizes. But we're looking
6749 * at a redeclaration of a named built-in interface block. So we
6750 * have to manually call check_builtin_array_max_size() for all parts
6751 * of the interface that are arrays.
6753 for (unsigned i
= 0; i
< num_variables
; i
++) {
6754 if (fields
[i
].type
->is_array()) {
6755 const unsigned size
= fields
[i
].type
->array_size();
6756 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
6760 validate_identifier(this->instance_name
, loc
, state
);
6765 if (this->array_specifier
!= NULL
) {
6766 const glsl_type
*block_array_type
=
6767 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
6769 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
6771 * For uniform blocks declared an array, each individual array
6772 * element corresponds to a separate buffer object backing one
6773 * instance of the block. As the array size indicates the number
6774 * of buffer objects needed, uniform block array declarations
6775 * must specify an array size.
6777 * And a few paragraphs later:
6779 * Geometry shader input blocks must be declared as arrays and
6780 * follow the array declaration and linking rules for all
6781 * geometry shader inputs. All other input and output block
6782 * arrays must specify an array size.
6784 * The same applies to tessellation shaders.
6786 * The upshot of this is that the only circumstance where an
6787 * interface array size *doesn't* need to be specified is on a
6788 * geometry shader input, tessellation control shader input,
6789 * tessellation control shader output, and tessellation evaluation
6792 if (block_array_type
->is_unsized_array()) {
6793 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
6794 state
->stage
== MESA_SHADER_TESS_CTRL
||
6795 state
->stage
== MESA_SHADER_TESS_EVAL
;
6796 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
6798 if (this->layout
.flags
.q
.in
) {
6800 _mesa_glsl_error(&loc
, state
,
6801 "unsized input block arrays not allowed in "
6803 _mesa_shader_stage_to_string(state
->stage
));
6804 } else if (this->layout
.flags
.q
.out
) {
6806 _mesa_glsl_error(&loc
, state
,
6807 "unsized output block arrays not allowed in "
6809 _mesa_shader_stage_to_string(state
->stage
));
6811 /* by elimination, this is a uniform block array */
6812 _mesa_glsl_error(&loc
, state
,
6813 "unsized uniform block arrays not allowed in "
6815 _mesa_shader_stage_to_string(state
->stage
));
6819 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
6821 * * Arrays of arrays of blocks are not allowed
6823 if (state
->es_shader
&& block_array_type
->is_array() &&
6824 block_array_type
->fields
.array
->is_array()) {
6825 _mesa_glsl_error(&loc
, state
,
6826 "arrays of arrays interface blocks are "
6830 var
= new(state
) ir_variable(block_array_type
,
6831 this->instance_name
,
6834 var
= new(state
) ir_variable(block_type
,
6835 this->instance_name
,
6839 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
6840 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
6842 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
6843 var
->data
.read_only
= true;
6845 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
6846 handle_geometry_shader_input_decl(state
, loc
, var
);
6847 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6848 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
6849 handle_tess_shader_input_decl(state
, loc
, var
);
6850 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
6851 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
6853 for (unsigned i
= 0; i
< num_variables
; i
++) {
6854 if (fields
[i
].type
->is_unsized_array()) {
6855 if (var_mode
== ir_var_shader_storage
) {
6856 if (i
!= (num_variables
- 1)) {
6857 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6858 "only last member of a shader storage block "
6859 "can be defined as unsized array",
6863 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
6865 * "If an array is declared as the last member of a shader storage
6866 * block and the size is not specified at compile-time, it is
6867 * sized at run-time. In all other cases, arrays are sized only
6870 if (state
->es_shader
) {
6871 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6872 "only last member of a shader storage block "
6873 "can be defined as unsized array",
6880 if (ir_variable
*earlier
=
6881 state
->symbols
->get_variable(this->instance_name
)) {
6882 if (!redeclaring_per_vertex
) {
6883 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
6884 this->instance_name
);
6886 earlier
->data
.how_declared
= ir_var_declared_normally
;
6887 earlier
->type
= var
->type
;
6888 earlier
->reinit_interface_type(block_type
);
6891 if (this->layout
.flags
.q
.explicit_binding
) {
6892 apply_explicit_binding(state
, &loc
, var
,
6893 var
->get_interface_type(), &this->layout
);
6896 var
->data
.stream
= qual_stream
;
6898 state
->symbols
->add_variable(var
);
6899 instructions
->push_tail(var
);
6902 /* In order to have an array size, the block must also be declared with
6905 assert(this->array_specifier
== NULL
);
6907 for (unsigned i
= 0; i
< num_variables
; i
++) {
6909 new(state
) ir_variable(fields
[i
].type
,
6910 ralloc_strdup(state
, fields
[i
].name
),
6912 var
->data
.interpolation
= fields
[i
].interpolation
;
6913 var
->data
.centroid
= fields
[i
].centroid
;
6914 var
->data
.sample
= fields
[i
].sample
;
6915 var
->data
.patch
= fields
[i
].patch
;
6916 var
->data
.stream
= qual_stream
;
6917 var
->init_interface_type(block_type
);
6919 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
6920 var
->data
.read_only
= true;
6922 /* Precision qualifiers do not have any meaning in Desktop GLSL */
6923 if (state
->es_shader
) {
6924 var
->data
.precision
=
6925 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
6929 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
6930 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
6931 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
6933 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
6936 if (var
->data
.mode
== ir_var_shader_storage
) {
6937 var
->data
.image_read_only
= fields
[i
].image_read_only
;
6938 var
->data
.image_write_only
= fields
[i
].image_write_only
;
6939 var
->data
.image_coherent
= fields
[i
].image_coherent
;
6940 var
->data
.image_volatile
= fields
[i
].image_volatile
;
6941 var
->data
.image_restrict
= fields
[i
].image_restrict
;
6944 /* Examine var name here since var may get deleted in the next call */
6945 bool var_is_gl_id
= is_gl_identifier(var
->name
);
6947 if (redeclaring_per_vertex
) {
6948 ir_variable
*earlier
=
6949 get_variable_being_redeclared(var
, loc
, state
,
6950 true /* allow_all_redeclarations */);
6951 if (!var_is_gl_id
|| earlier
== NULL
) {
6952 _mesa_glsl_error(&loc
, state
,
6953 "redeclaration of gl_PerVertex can only "
6954 "include built-in variables");
6955 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
6956 _mesa_glsl_error(&loc
, state
,
6957 "`%s' has already been redeclared",
6960 earlier
->data
.how_declared
= ir_var_declared_in_block
;
6961 earlier
->reinit_interface_type(block_type
);
6966 if (state
->symbols
->get_variable(var
->name
) != NULL
)
6967 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
6969 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
6970 * The UBO declaration itself doesn't get an ir_variable unless it
6971 * has an instance name. This is ugly.
6973 if (this->layout
.flags
.q
.explicit_binding
) {
6974 apply_explicit_binding(state
, &loc
, var
,
6975 var
->get_interface_type(), &this->layout
);
6978 if (var
->type
->is_unsized_array()) {
6979 if (var
->is_in_shader_storage_block()) {
6980 if (!is_unsized_array_last_element(var
)) {
6981 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6982 "only last member of a shader storage block "
6983 "can be defined as unsized array",
6986 var
->data
.from_ssbo_unsized_array
= true;
6988 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
6990 * "If an array is declared as the last member of a shader storage
6991 * block and the size is not specified at compile-time, it is
6992 * sized at run-time. In all other cases, arrays are sized only
6995 if (state
->es_shader
) {
6996 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
6997 "only last member of a shader storage block "
6998 "can be defined as unsized array",
7004 state
->symbols
->add_variable(var
);
7005 instructions
->push_tail(var
);
7008 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7009 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7011 * It is also a compilation error ... to redeclare a built-in
7012 * block and then use a member from that built-in block that was
7013 * not included in the redeclaration.
7015 * This appears to be a clarification to the behaviour established
7016 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7017 * behaviour regardless of GLSL version.
7019 * To prevent the shader from using a member that was not included in
7020 * the redeclaration, we disable any ir_variables that are still
7021 * associated with the old declaration of gl_PerVertex (since we've
7022 * already updated all of the variables contained in the new
7023 * gl_PerVertex to point to it).
7025 * As a side effect this will prevent
7026 * validate_intrastage_interface_blocks() from getting confused and
7027 * thinking there are conflicting definitions of gl_PerVertex in the
7030 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7031 ir_variable
*const var
= node
->as_variable();
7033 var
->get_interface_type() == earlier_per_vertex
&&
7034 var
->data
.mode
== var_mode
) {
7035 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7036 _mesa_glsl_error(&loc
, state
,
7037 "redeclaration of gl_PerVertex cannot "
7038 "follow a redeclaration of `%s'",
7041 state
->symbols
->disable_variable(var
->name
);
7053 ast_tcs_output_layout::hir(exec_list
*instructions
,
7054 struct _mesa_glsl_parse_state
*state
)
7056 YYLTYPE loc
= this->get_location();
7058 /* If any tessellation control output layout declaration preceded this
7059 * one, make sure it was consistent with this one.
7061 if (state
->tcs_output_vertices_specified
&&
7062 state
->out_qualifier
->vertices
!= this->vertices
) {
7063 _mesa_glsl_error(&loc
, state
,
7064 "tessellation control shader output layout does not "
7065 "match previous declaration");
7069 /* If any shader outputs occurred before this declaration and specified an
7070 * array size, make sure the size they specified is consistent with the
7073 unsigned num_vertices
= this->vertices
;
7074 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7075 _mesa_glsl_error(&loc
, state
,
7076 "this tessellation control shader output layout "
7077 "specifies %u vertices, but a previous output "
7078 "is declared with size %u",
7079 num_vertices
, state
->tcs_output_size
);
7083 state
->tcs_output_vertices_specified
= true;
7085 /* If any shader outputs occurred before this declaration and did not
7086 * specify an array size, their size is determined now.
7088 foreach_in_list (ir_instruction
, node
, instructions
) {
7089 ir_variable
*var
= node
->as_variable();
7090 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7093 /* Note: Not all tessellation control shader output are arrays. */
7094 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7097 if (var
->data
.max_array_access
>= num_vertices
) {
7098 _mesa_glsl_error(&loc
, state
,
7099 "this tessellation control shader output layout "
7100 "specifies %u vertices, but an access to element "
7101 "%u of output `%s' already exists", num_vertices
,
7102 var
->data
.max_array_access
, var
->name
);
7104 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7114 ast_gs_input_layout::hir(exec_list
*instructions
,
7115 struct _mesa_glsl_parse_state
*state
)
7117 YYLTYPE loc
= this->get_location();
7119 /* If any geometry input layout declaration preceded this one, make sure it
7120 * was consistent with this one.
7122 if (state
->gs_input_prim_type_specified
&&
7123 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7124 _mesa_glsl_error(&loc
, state
,
7125 "geometry shader input layout does not match"
7126 " previous declaration");
7130 /* If any shader inputs occurred before this declaration and specified an
7131 * array size, make sure the size they specified is consistent with the
7134 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7135 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7136 _mesa_glsl_error(&loc
, state
,
7137 "this geometry shader input layout implies %u vertices"
7138 " per primitive, but a previous input is declared"
7139 " with size %u", num_vertices
, state
->gs_input_size
);
7143 state
->gs_input_prim_type_specified
= true;
7145 /* If any shader inputs occurred before this declaration and did not
7146 * specify an array size, their size is determined now.
7148 foreach_in_list(ir_instruction
, node
, instructions
) {
7149 ir_variable
*var
= node
->as_variable();
7150 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7153 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7157 if (var
->type
->is_unsized_array()) {
7158 if (var
->data
.max_array_access
>= num_vertices
) {
7159 _mesa_glsl_error(&loc
, state
,
7160 "this geometry shader input layout implies %u"
7161 " vertices, but an access to element %u of input"
7162 " `%s' already exists", num_vertices
,
7163 var
->data
.max_array_access
, var
->name
);
7165 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7176 ast_cs_input_layout::hir(exec_list
*instructions
,
7177 struct _mesa_glsl_parse_state
*state
)
7179 YYLTYPE loc
= this->get_location();
7181 /* If any compute input layout declaration preceded this one, make sure it
7182 * was consistent with this one.
7184 if (state
->cs_input_local_size_specified
) {
7185 for (int i
= 0; i
< 3; i
++) {
7186 if (state
->cs_input_local_size
[i
] != this->local_size
[i
]) {
7187 _mesa_glsl_error(&loc
, state
,
7188 "compute shader input layout does not match"
7189 " previous declaration");
7195 /* From the ARB_compute_shader specification:
7197 * If the local size of the shader in any dimension is greater
7198 * than the maximum size supported by the implementation for that
7199 * dimension, a compile-time error results.
7201 * It is not clear from the spec how the error should be reported if
7202 * the total size of the work group exceeds
7203 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7204 * report it at compile time as well.
7206 GLuint64 total_invocations
= 1;
7207 for (int i
= 0; i
< 3; i
++) {
7208 if (this->local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7209 _mesa_glsl_error(&loc
, state
,
7210 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7212 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7215 total_invocations
*= this->local_size
[i
];
7216 if (total_invocations
>
7217 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7218 _mesa_glsl_error(&loc
, state
,
7219 "product of local_sizes exceeds "
7220 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7221 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7226 state
->cs_input_local_size_specified
= true;
7227 for (int i
= 0; i
< 3; i
++)
7228 state
->cs_input_local_size
[i
] = this->local_size
[i
];
7230 /* We may now declare the built-in constant gl_WorkGroupSize (see
7231 * builtin_variable_generator::generate_constants() for why we didn't
7232 * declare it earlier).
7234 ir_variable
*var
= new(state
->symbols
)
7235 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7236 var
->data
.how_declared
= ir_var_declared_implicitly
;
7237 var
->data
.read_only
= true;
7238 instructions
->push_tail(var
);
7239 state
->symbols
->add_variable(var
);
7240 ir_constant_data data
;
7241 memset(&data
, 0, sizeof(data
));
7242 for (int i
= 0; i
< 3; i
++)
7243 data
.u
[i
] = this->local_size
[i
];
7244 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7245 var
->constant_initializer
=
7246 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7247 var
->data
.has_initializer
= true;
7254 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7255 exec_list
*instructions
)
7257 bool gl_FragColor_assigned
= false;
7258 bool gl_FragData_assigned
= false;
7259 bool gl_FragSecondaryColor_assigned
= false;
7260 bool gl_FragSecondaryData_assigned
= false;
7261 bool user_defined_fs_output_assigned
= false;
7262 ir_variable
*user_defined_fs_output
= NULL
;
7264 /* It would be nice to have proper location information. */
7266 memset(&loc
, 0, sizeof(loc
));
7268 foreach_in_list(ir_instruction
, node
, instructions
) {
7269 ir_variable
*var
= node
->as_variable();
7271 if (!var
|| !var
->data
.assigned
)
7274 if (strcmp(var
->name
, "gl_FragColor") == 0)
7275 gl_FragColor_assigned
= true;
7276 else if (strcmp(var
->name
, "gl_FragData") == 0)
7277 gl_FragData_assigned
= true;
7278 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7279 gl_FragSecondaryColor_assigned
= true;
7280 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7281 gl_FragSecondaryData_assigned
= true;
7282 else if (!is_gl_identifier(var
->name
)) {
7283 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7284 var
->data
.mode
== ir_var_shader_out
) {
7285 user_defined_fs_output_assigned
= true;
7286 user_defined_fs_output
= var
;
7291 /* From the GLSL 1.30 spec:
7293 * "If a shader statically assigns a value to gl_FragColor, it
7294 * may not assign a value to any element of gl_FragData. If a
7295 * shader statically writes a value to any element of
7296 * gl_FragData, it may not assign a value to
7297 * gl_FragColor. That is, a shader may assign values to either
7298 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7299 * linked together must also consistently write just one of
7300 * these variables. Similarly, if user declared output
7301 * variables are in use (statically assigned to), then the
7302 * built-in variables gl_FragColor and gl_FragData may not be
7303 * assigned to. These incorrect usages all generate compile
7306 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7307 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7308 "`gl_FragColor' and `gl_FragData'");
7309 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7310 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7311 "`gl_FragColor' and `%s'",
7312 user_defined_fs_output
->name
);
7313 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7314 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7315 "`gl_FragSecondaryColorEXT' and"
7316 " `gl_FragSecondaryDataEXT'");
7317 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7318 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7319 "`gl_FragColor' and"
7320 " `gl_FragSecondaryDataEXT'");
7321 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7322 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7324 " `gl_FragSecondaryColorEXT'");
7325 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7326 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7327 "`gl_FragData' and `%s'",
7328 user_defined_fs_output
->name
);
7331 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7332 !state
->EXT_blend_func_extended_enable
) {
7333 _mesa_glsl_error(&loc
, state
,
7334 "Dual source blending requires EXT_blend_func_extended");
7340 remove_per_vertex_blocks(exec_list
*instructions
,
7341 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7343 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7344 * if it exists in this shader type.
7346 const glsl_type
*per_vertex
= NULL
;
7348 case ir_var_shader_in
:
7349 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7350 per_vertex
= gl_in
->get_interface_type();
7352 case ir_var_shader_out
:
7353 if (ir_variable
*gl_Position
=
7354 state
->symbols
->get_variable("gl_Position")) {
7355 per_vertex
= gl_Position
->get_interface_type();
7359 assert(!"Unexpected mode");
7363 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7364 * need to do anything.
7366 if (per_vertex
== NULL
)
7369 /* If the interface block is used by the shader, then we don't need to do
7372 interface_block_usage_visitor
v(mode
, per_vertex
);
7373 v
.run(instructions
);
7374 if (v
.usage_found())
7377 /* Remove any ir_variable declarations that refer to the interface block
7380 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7381 ir_variable
*const var
= node
->as_variable();
7382 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
7383 var
->data
.mode
== mode
) {
7384 state
->symbols
->disable_variable(var
->name
);