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"
58 #include "ir_builder.h"
60 using namespace ir_builder
;
63 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
64 exec_list
*instructions
);
66 remove_per_vertex_blocks(exec_list
*instructions
,
67 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
71 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
73 _mesa_glsl_initialize_variables(instructions
, state
);
75 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
77 state
->current_function
= NULL
;
79 state
->toplevel_ir
= instructions
;
81 state
->gs_input_prim_type_specified
= false;
82 state
->cs_input_local_size_specified
= false;
84 /* Section 4.2 of the GLSL 1.20 specification states:
85 * "The built-in functions are scoped in a scope outside the global scope
86 * users declare global variables in. That is, a shader's global scope,
87 * available for user-defined functions and global variables, is nested
88 * inside the scope containing the built-in functions."
90 * Since built-in functions like ftransform() access built-in variables,
91 * it follows that those must be in the outer scope as well.
93 * We push scope here to create this nesting effect...but don't pop.
94 * This way, a shader's globals are still in the symbol table for use
97 state
->symbols
->push_scope();
99 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
100 ast
->hir(instructions
, state
);
102 detect_recursion_unlinked(state
, instructions
);
103 detect_conflicting_assignments(state
, instructions
);
105 state
->toplevel_ir
= NULL
;
107 /* Move all of the variable declarations to the front of the IR list, and
108 * reverse the order. This has the (intended!) side effect that vertex
109 * shader inputs and fragment shader outputs will appear in the IR in the
110 * same order that they appeared in the shader code. This results in the
111 * locations being assigned in the declared order. Many (arguably buggy)
112 * applications depend on this behavior, and it matches what nearly all
115 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
116 ir_variable
*const var
= node
->as_variable();
122 instructions
->push_head(var
);
125 /* Figure out if gl_FragCoord is actually used in fragment shader */
126 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
128 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
130 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
132 * If multiple shaders using members of a built-in block belonging to
133 * the same interface are linked together in the same program, they
134 * must all redeclare the built-in block in the same way, as described
135 * in section 4.3.7 "Interface Blocks" for interface block matching, or
136 * a link error will result.
138 * The phrase "using members of a built-in block" implies that if two
139 * shaders are linked together and one of them *does not use* any members
140 * of the built-in block, then that shader does not need to have a matching
141 * redeclaration of the built-in block.
143 * This appears to be a clarification to the behaviour established for
144 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
147 * The definition of "interface" in section 4.3.7 that applies here is as
150 * The boundary between adjacent programmable pipeline stages: This
151 * spans all the outputs in all compilation units of the first stage
152 * and all the inputs in all compilation units of the second stage.
154 * Therefore this rule applies to both inter- and intra-stage linking.
156 * The easiest way to implement this is to check whether the shader uses
157 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
158 * remove all the relevant variable declaration from the IR, so that the
159 * linker won't see them and complain about mismatches.
161 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
162 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
166 static ir_expression_operation
167 get_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
168 struct _mesa_glsl_parse_state
*state
)
170 switch (to
->base_type
) {
171 case GLSL_TYPE_FLOAT
:
172 switch (from
->base_type
) {
173 case GLSL_TYPE_INT
: return ir_unop_i2f
;
174 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
175 case GLSL_TYPE_DOUBLE
: return ir_unop_d2f
;
176 default: return (ir_expression_operation
)0;
180 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
)
181 return (ir_expression_operation
)0;
182 switch (from
->base_type
) {
183 case GLSL_TYPE_INT
: return ir_unop_i2u
;
184 default: return (ir_expression_operation
)0;
187 case GLSL_TYPE_DOUBLE
:
188 if (!state
->has_double())
189 return (ir_expression_operation
)0;
190 switch (from
->base_type
) {
191 case GLSL_TYPE_INT
: return ir_unop_i2d
;
192 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
193 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
194 default: return (ir_expression_operation
)0;
197 default: return (ir_expression_operation
)0;
203 * If a conversion is available, convert one operand to a different type
205 * The \c from \c ir_rvalue is converted "in place".
207 * \param to Type that the operand it to be converted to
208 * \param from Operand that is being converted
209 * \param state GLSL compiler state
212 * If a conversion is possible (or unnecessary), \c true is returned.
213 * Otherwise \c false is returned.
216 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
217 struct _mesa_glsl_parse_state
*state
)
220 if (to
->base_type
== from
->type
->base_type
)
223 /* Prior to GLSL 1.20, there are no implicit conversions */
224 if (!state
->is_version(120, 0))
227 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
229 * "There are no implicit array or structure conversions. For
230 * example, an array of int cannot be implicitly converted to an
233 if (!to
->is_numeric() || !from
->type
->is_numeric())
236 /* We don't actually want the specific type `to`, we want a type
237 * with the same base type as `to`, but the same vector width as
240 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
241 from
->type
->matrix_columns
);
243 ir_expression_operation op
= get_conversion_operation(to
, from
->type
, state
);
245 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
253 static const struct glsl_type
*
254 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
256 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
258 const glsl_type
*type_a
= value_a
->type
;
259 const glsl_type
*type_b
= value_b
->type
;
261 /* From GLSL 1.50 spec, page 56:
263 * "The arithmetic binary operators add (+), subtract (-),
264 * multiply (*), and divide (/) operate on integer and
265 * floating-point scalars, vectors, and matrices."
267 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
268 _mesa_glsl_error(loc
, state
,
269 "operands to arithmetic operators must be numeric");
270 return glsl_type::error_type
;
274 /* "If one operand is floating-point based and the other is
275 * not, then the conversions from Section 4.1.10 "Implicit
276 * Conversions" are applied to the non-floating-point-based operand."
278 if (!apply_implicit_conversion(type_a
, value_b
, state
)
279 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
280 _mesa_glsl_error(loc
, state
,
281 "could not implicitly convert operands to "
282 "arithmetic operator");
283 return glsl_type::error_type
;
285 type_a
= value_a
->type
;
286 type_b
= value_b
->type
;
288 /* "If the operands are integer types, they must both be signed or
291 * From this rule and the preceeding conversion it can be inferred that
292 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
293 * The is_numeric check above already filtered out the case where either
294 * type is not one of these, so now the base types need only be tested for
297 if (type_a
->base_type
!= type_b
->base_type
) {
298 _mesa_glsl_error(loc
, state
,
299 "base type mismatch for arithmetic operator");
300 return glsl_type::error_type
;
303 /* "All arithmetic binary operators result in the same fundamental type
304 * (signed integer, unsigned integer, or floating-point) as the
305 * operands they operate on, after operand type conversion. After
306 * conversion, the following cases are valid
308 * * The two operands are scalars. In this case the operation is
309 * applied, resulting in a scalar."
311 if (type_a
->is_scalar() && type_b
->is_scalar())
314 /* "* One operand is a scalar, and the other is a vector or matrix.
315 * In this case, the scalar operation is applied independently to each
316 * component of the vector or matrix, resulting in the same size
319 if (type_a
->is_scalar()) {
320 if (!type_b
->is_scalar())
322 } else if (type_b
->is_scalar()) {
326 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
327 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
330 assert(!type_a
->is_scalar());
331 assert(!type_b
->is_scalar());
333 /* "* The two operands are vectors of the same size. In this case, the
334 * operation is done component-wise resulting in the same size
337 if (type_a
->is_vector() && type_b
->is_vector()) {
338 if (type_a
== type_b
) {
341 _mesa_glsl_error(loc
, state
,
342 "vector size mismatch for arithmetic operator");
343 return glsl_type::error_type
;
347 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
348 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
349 * <vector, vector> have been handled. At least one of the operands must
350 * be matrix. Further, since there are no integer matrix types, the base
351 * type of both operands must be float.
353 assert(type_a
->is_matrix() || type_b
->is_matrix());
354 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
||
355 type_a
->base_type
== GLSL_TYPE_DOUBLE
);
356 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
||
357 type_b
->base_type
== GLSL_TYPE_DOUBLE
);
359 /* "* The operator is add (+), subtract (-), or divide (/), and the
360 * operands are matrices with the same number of rows and the same
361 * number of columns. In this case, the operation is done component-
362 * wise resulting in the same size matrix."
363 * * The operator is multiply (*), where both operands are matrices or
364 * one operand is a vector and the other a matrix. A right vector
365 * operand is treated as a column vector and a left vector operand as a
366 * row vector. In all these cases, it is required that the number of
367 * columns of the left operand is equal to the number of rows of the
368 * right operand. Then, the multiply (*) operation does a linear
369 * algebraic multiply, yielding an object that has the same number of
370 * rows as the left operand and the same number of columns as the right
371 * operand. Section 5.10 "Vector and Matrix Operations" explains in
372 * more detail how vectors and matrices are operated on."
375 if (type_a
== type_b
)
378 if (type_a
->is_matrix() && type_b
->is_matrix()) {
379 /* Matrix multiply. The columns of A must match the rows of B. Given
380 * the other previously tested constraints, this means the vector type
381 * of a row from A must be the same as the vector type of a column from
384 if (type_a
->row_type() == type_b
->column_type()) {
385 /* The resulting matrix has the number of columns of matrix B and
386 * the number of rows of matrix A. We get the row count of A by
387 * looking at the size of a vector that makes up a column. The
388 * transpose (size of a row) is done for B.
390 const glsl_type
*const type
=
391 glsl_type::get_instance(type_a
->base_type
,
392 type_a
->column_type()->vector_elements
,
393 type_b
->row_type()->vector_elements
);
394 assert(type
!= glsl_type::error_type
);
398 } else if (type_a
->is_matrix()) {
399 /* A is a matrix and B is a column vector. Columns of A must match
400 * rows of B. Given the other previously tested constraints, this
401 * means the vector type of a row from A must be the same as the
402 * vector the type of B.
404 if (type_a
->row_type() == type_b
) {
405 /* The resulting vector has a number of elements equal to
406 * the number of rows of matrix A. */
407 const glsl_type
*const type
=
408 glsl_type::get_instance(type_a
->base_type
,
409 type_a
->column_type()->vector_elements
,
411 assert(type
!= glsl_type::error_type
);
416 assert(type_b
->is_matrix());
418 /* A is a row vector and B is a matrix. Columns of A must match rows
419 * of B. Given the other previously tested constraints, this means
420 * the type of A must be the same as the vector type of a column from
423 if (type_a
== type_b
->column_type()) {
424 /* The resulting vector has a number of elements equal to
425 * the number of columns of matrix B. */
426 const glsl_type
*const type
=
427 glsl_type::get_instance(type_a
->base_type
,
428 type_b
->row_type()->vector_elements
,
430 assert(type
!= glsl_type::error_type
);
436 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
437 return glsl_type::error_type
;
441 /* "All other cases are illegal."
443 _mesa_glsl_error(loc
, state
, "type mismatch");
444 return glsl_type::error_type
;
448 static const struct glsl_type
*
449 unary_arithmetic_result_type(const struct glsl_type
*type
,
450 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
452 /* From GLSL 1.50 spec, page 57:
454 * "The arithmetic unary operators negate (-), post- and pre-increment
455 * and decrement (-- and ++) operate on integer or floating-point
456 * values (including vectors and matrices). All unary operators work
457 * component-wise on their operands. These result with the same type
460 if (!type
->is_numeric()) {
461 _mesa_glsl_error(loc
, state
,
462 "operands to arithmetic operators must be numeric");
463 return glsl_type::error_type
;
470 * \brief Return the result type of a bit-logic operation.
472 * If the given types to the bit-logic operator are invalid, return
473 * glsl_type::error_type.
475 * \param type_a Type of LHS of bit-logic op
476 * \param type_b Type of RHS of bit-logic op
478 static const struct glsl_type
*
479 bit_logic_result_type(const struct glsl_type
*type_a
,
480 const struct glsl_type
*type_b
,
482 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
484 if (!state
->check_bitwise_operations_allowed(loc
)) {
485 return glsl_type::error_type
;
488 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
490 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
491 * (|). The operands must be of type signed or unsigned integers or
494 if (!type_a
->is_integer()) {
495 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
496 ast_expression::operator_string(op
));
497 return glsl_type::error_type
;
499 if (!type_b
->is_integer()) {
500 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
501 ast_expression::operator_string(op
));
502 return glsl_type::error_type
;
505 /* "The fundamental types of the operands (signed or unsigned) must
508 if (type_a
->base_type
!= type_b
->base_type
) {
509 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
510 "base type", ast_expression::operator_string(op
));
511 return glsl_type::error_type
;
514 /* "The operands cannot be vectors of differing size." */
515 if (type_a
->is_vector() &&
516 type_b
->is_vector() &&
517 type_a
->vector_elements
!= type_b
->vector_elements
) {
518 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
519 "different sizes", ast_expression::operator_string(op
));
520 return glsl_type::error_type
;
523 /* "If one operand is a scalar and the other a vector, the scalar is
524 * applied component-wise to the vector, resulting in the same type as
525 * the vector. The fundamental types of the operands [...] will be the
526 * resulting fundamental type."
528 if (type_a
->is_scalar())
534 static const struct glsl_type
*
535 modulus_result_type(const struct glsl_type
*type_a
,
536 const struct glsl_type
*type_b
,
537 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
539 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
540 return glsl_type::error_type
;
543 /* From GLSL 1.50 spec, page 56:
544 * "The operator modulus (%) operates on signed or unsigned integers or
545 * integer vectors. The operand types must both be signed or both be
548 if (!type_a
->is_integer()) {
549 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
550 return glsl_type::error_type
;
552 if (!type_b
->is_integer()) {
553 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
554 return glsl_type::error_type
;
556 if (type_a
->base_type
!= type_b
->base_type
) {
557 _mesa_glsl_error(loc
, state
,
558 "operands of %% must have the same base type");
559 return glsl_type::error_type
;
562 /* "The operands cannot be vectors of differing size. If one operand is
563 * a scalar and the other vector, then the scalar is applied component-
564 * wise to the vector, resulting in the same type as the vector. If both
565 * are vectors of the same size, the result is computed component-wise."
567 if (type_a
->is_vector()) {
568 if (!type_b
->is_vector()
569 || (type_a
->vector_elements
== type_b
->vector_elements
))
574 /* "The operator modulus (%) is not defined for any other data types
575 * (non-integer types)."
577 _mesa_glsl_error(loc
, state
, "type mismatch");
578 return glsl_type::error_type
;
582 static const struct glsl_type
*
583 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
584 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
586 const glsl_type
*type_a
= value_a
->type
;
587 const glsl_type
*type_b
= value_b
->type
;
589 /* From GLSL 1.50 spec, page 56:
590 * "The relational operators greater than (>), less than (<), greater
591 * than or equal (>=), and less than or equal (<=) operate only on
592 * scalar integer and scalar floating-point expressions."
594 if (!type_a
->is_numeric()
595 || !type_b
->is_numeric()
596 || !type_a
->is_scalar()
597 || !type_b
->is_scalar()) {
598 _mesa_glsl_error(loc
, state
,
599 "operands to relational operators must be scalar and "
601 return glsl_type::error_type
;
604 /* "Either the operands' types must match, or the conversions from
605 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
606 * operand, after which the types must match."
608 if (!apply_implicit_conversion(type_a
, value_b
, state
)
609 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
610 _mesa_glsl_error(loc
, state
,
611 "could not implicitly convert operands to "
612 "relational operator");
613 return glsl_type::error_type
;
615 type_a
= value_a
->type
;
616 type_b
= value_b
->type
;
618 if (type_a
->base_type
!= type_b
->base_type
) {
619 _mesa_glsl_error(loc
, state
, "base type mismatch");
620 return glsl_type::error_type
;
623 /* "The result is scalar Boolean."
625 return glsl_type::bool_type
;
629 * \brief Return the result type of a bit-shift operation.
631 * If the given types to the bit-shift operator are invalid, return
632 * glsl_type::error_type.
634 * \param type_a Type of LHS of bit-shift op
635 * \param type_b Type of RHS of bit-shift op
637 static const struct glsl_type
*
638 shift_result_type(const struct glsl_type
*type_a
,
639 const struct glsl_type
*type_b
,
641 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
643 if (!state
->check_bitwise_operations_allowed(loc
)) {
644 return glsl_type::error_type
;
647 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
649 * "The shift operators (<<) and (>>). For both operators, the operands
650 * must be signed or unsigned integers or integer vectors. One operand
651 * can be signed while the other is unsigned."
653 if (!type_a
->is_integer()) {
654 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
655 "integer vector", ast_expression::operator_string(op
));
656 return glsl_type::error_type
;
659 if (!type_b
->is_integer()) {
660 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
661 "integer vector", ast_expression::operator_string(op
));
662 return glsl_type::error_type
;
665 /* "If the first operand is a scalar, the second operand has to be
668 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
669 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
670 "second must be scalar as well",
671 ast_expression::operator_string(op
));
672 return glsl_type::error_type
;
675 /* If both operands are vectors, check that they have same number of
678 if (type_a
->is_vector() &&
679 type_b
->is_vector() &&
680 type_a
->vector_elements
!= type_b
->vector_elements
) {
681 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
682 "have same number of elements",
683 ast_expression::operator_string(op
));
684 return glsl_type::error_type
;
687 /* "In all cases, the resulting type will be the same type as the left
694 * Validates that a value can be assigned to a location with a specified type
696 * Validates that \c rhs can be assigned to some location. If the types are
697 * not an exact match but an automatic conversion is possible, \c rhs will be
701 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
702 * Otherwise the actual RHS to be assigned will be returned. This may be
703 * \c rhs, or it may be \c rhs after some type conversion.
706 * In addition to being used for assignments, this function is used to
707 * type-check return values.
710 validate_assignment(struct _mesa_glsl_parse_state
*state
,
711 YYLTYPE loc
, const glsl_type
*lhs_type
,
712 ir_rvalue
*rhs
, bool is_initializer
)
714 /* If there is already some error in the RHS, just return it. Anything
715 * else will lead to an avalanche of error message back to the user.
717 if (rhs
->type
->is_error())
720 /* If the types are identical, the assignment can trivially proceed.
722 if (rhs
->type
== lhs_type
)
725 /* If the array element types are the same and the LHS is unsized,
726 * the assignment is okay for initializers embedded in variable
729 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
730 * is handled by ir_dereference::is_lvalue.
732 if (lhs_type
->is_unsized_array() && rhs
->type
->is_array()
733 && (lhs_type
->element_type() == rhs
->type
->element_type())) {
734 if (is_initializer
) {
737 _mesa_glsl_error(&loc
, state
,
738 "implicitly sized arrays cannot be assigned");
743 /* Check for implicit conversion in GLSL 1.20 */
744 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
745 if (rhs
->type
== lhs_type
)
749 _mesa_glsl_error(&loc
, state
,
750 "%s of type %s cannot be assigned to "
751 "variable of type %s",
752 is_initializer
? "initializer" : "value",
753 rhs
->type
->name
, lhs_type
->name
);
759 mark_whole_array_access(ir_rvalue
*access
)
761 ir_dereference_variable
*deref
= access
->as_dereference_variable();
763 if (deref
&& deref
->var
) {
764 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
769 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
770 const char *non_lvalue_description
,
771 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
772 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
777 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
778 ir_rvalue
*extract_channel
= NULL
;
780 /* If the assignment LHS comes back as an ir_binop_vector_extract
781 * expression, move it to the RHS as an ir_triop_vector_insert.
783 if (lhs
->ir_type
== ir_type_expression
) {
784 ir_expression
*const lhs_expr
= lhs
->as_expression();
786 if (unlikely(lhs_expr
->operation
== ir_binop_vector_extract
)) {
788 validate_assignment(state
, lhs_loc
, lhs
->type
,
789 rhs
, is_initializer
);
791 if (new_rhs
== NULL
) {
795 * - LHS: (expression float vector_extract <vec> <channel>)
799 * - RHS: (expression vec2 vector_insert <vec> <channel> <scalar>)
801 * The LHS type is now a vector instead of a scalar. Since GLSL
802 * allows assignments to be used as rvalues, we need to re-extract
803 * the channel from assignment_temp when returning the rvalue.
805 extract_channel
= lhs_expr
->operands
[1];
806 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
807 lhs_expr
->operands
[0]->type
,
808 lhs_expr
->operands
[0],
811 lhs
= lhs_expr
->operands
[0]->clone(ctx
, NULL
);
816 ir_variable
*lhs_var
= lhs
->variable_referenced();
818 lhs_var
->data
.assigned
= true;
820 if (!error_emitted
) {
821 if (non_lvalue_description
!= NULL
) {
822 _mesa_glsl_error(&lhs_loc
, state
,
824 non_lvalue_description
);
825 error_emitted
= true;
826 } else if (lhs_var
!= NULL
&& lhs_var
->data
.read_only
) {
827 _mesa_glsl_error(&lhs_loc
, state
,
828 "assignment to read-only variable '%s'",
830 error_emitted
= true;
831 } else if (lhs
->type
->is_array() &&
832 !state
->check_version(120, 300, &lhs_loc
,
833 "whole array assignment forbidden")) {
834 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
836 * "Other binary or unary expressions, non-dereferenced
837 * arrays, function names, swizzles with repeated fields,
838 * and constants cannot be l-values."
840 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
842 error_emitted
= true;
843 } else if (!lhs
->is_lvalue()) {
844 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
845 error_emitted
= true;
850 validate_assignment(state
, lhs_loc
, lhs
->type
, rhs
, is_initializer
);
851 if (new_rhs
!= NULL
) {
854 /* If the LHS array was not declared with a size, it takes it size from
855 * the RHS. If the LHS is an l-value and a whole array, it must be a
856 * dereference of a variable. Any other case would require that the LHS
857 * is either not an l-value or not a whole array.
859 if (lhs
->type
->is_unsized_array()) {
860 ir_dereference
*const d
= lhs
->as_dereference();
864 ir_variable
*const var
= d
->variable_referenced();
868 if (var
->data
.max_array_access
>= unsigned(rhs
->type
->array_size())) {
869 /* FINISHME: This should actually log the location of the RHS. */
870 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
872 var
->data
.max_array_access
);
875 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
876 rhs
->type
->array_size());
879 if (lhs
->type
->is_array()) {
880 mark_whole_array_access(rhs
);
881 mark_whole_array_access(lhs
);
885 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
886 * but not post_inc) need the converted assigned value as an rvalue
887 * to handle things like:
892 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
894 instructions
->push_tail(var
);
895 instructions
->push_tail(assign(var
, rhs
));
897 if (!error_emitted
) {
898 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
899 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
901 ir_rvalue
*rvalue
= new(ctx
) ir_dereference_variable(var
);
903 if (extract_channel
) {
904 rvalue
= new(ctx
) ir_expression(ir_binop_vector_extract
,
906 extract_channel
->clone(ctx
, NULL
));
909 *out_rvalue
= rvalue
;
912 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
916 return error_emitted
;
920 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
922 void *ctx
= ralloc_parent(lvalue
);
925 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
927 instructions
->push_tail(var
);
929 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
932 return new(ctx
) ir_dereference_variable(var
);
937 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
946 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
947 struct _mesa_glsl_parse_state
*state
)
949 (void)hir(instructions
, state
);
953 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
954 struct _mesa_glsl_parse_state
*state
)
956 (void)hir(instructions
, state
);
960 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
963 ir_rvalue
*cmp
= NULL
;
965 if (operation
== ir_binop_all_equal
)
966 join_op
= ir_binop_logic_and
;
968 join_op
= ir_binop_logic_or
;
970 switch (op0
->type
->base_type
) {
971 case GLSL_TYPE_FLOAT
:
975 case GLSL_TYPE_DOUBLE
:
976 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
978 case GLSL_TYPE_ARRAY
: {
979 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
980 ir_rvalue
*e0
, *e1
, *result
;
982 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
983 new(mem_ctx
) ir_constant(i
));
984 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
985 new(mem_ctx
) ir_constant(i
));
986 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
989 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
995 mark_whole_array_access(op0
);
996 mark_whole_array_access(op1
);
1000 case GLSL_TYPE_STRUCT
: {
1001 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1002 ir_rvalue
*e0
, *e1
, *result
;
1003 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1005 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1007 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1009 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1012 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1020 case GLSL_TYPE_ERROR
:
1021 case GLSL_TYPE_VOID
:
1022 case GLSL_TYPE_SAMPLER
:
1023 case GLSL_TYPE_IMAGE
:
1024 case GLSL_TYPE_INTERFACE
:
1025 case GLSL_TYPE_ATOMIC_UINT
:
1026 /* I assume a comparison of a struct containing a sampler just
1027 * ignores the sampler present in the type.
1033 cmp
= new(mem_ctx
) ir_constant(true);
1038 /* For logical operations, we want to ensure that the operands are
1039 * scalar booleans. If it isn't, emit an error and return a constant
1040 * boolean to avoid triggering cascading error messages.
1043 get_scalar_boolean_operand(exec_list
*instructions
,
1044 struct _mesa_glsl_parse_state
*state
,
1045 ast_expression
*parent_expr
,
1047 const char *operand_name
,
1048 bool *error_emitted
)
1050 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1052 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1054 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1057 if (!*error_emitted
) {
1058 YYLTYPE loc
= expr
->get_location();
1059 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1061 parent_expr
->operator_string(parent_expr
->oper
));
1062 *error_emitted
= true;
1065 return new(ctx
) ir_constant(true);
1069 * If name refers to a builtin array whose maximum allowed size is less than
1070 * size, report an error and return true. Otherwise return false.
1073 check_builtin_array_max_size(const char *name
, unsigned size
,
1074 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1076 if ((strcmp("gl_TexCoord", name
) == 0)
1077 && (size
> state
->Const
.MaxTextureCoords
)) {
1078 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1080 * "The size [of gl_TexCoord] can be at most
1081 * gl_MaxTextureCoords."
1083 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1084 "be larger than gl_MaxTextureCoords (%u)",
1085 state
->Const
.MaxTextureCoords
);
1086 } else if (strcmp("gl_ClipDistance", name
) == 0
1087 && size
> state
->Const
.MaxClipPlanes
) {
1088 /* From section 7.1 (Vertex Shader Special Variables) of the
1091 * "The gl_ClipDistance array is predeclared as unsized and
1092 * must be sized by the shader either redeclaring it with a
1093 * size or indexing it only with integral constant
1094 * expressions. ... The size can be at most
1095 * gl_MaxClipDistances."
1097 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1098 "be larger than gl_MaxClipDistances (%u)",
1099 state
->Const
.MaxClipPlanes
);
1104 * Create the constant 1, of a which is appropriate for incrementing and
1105 * decrementing values of the given GLSL type. For example, if type is vec4,
1106 * this creates a constant value of 1.0 having type float.
1108 * If the given type is invalid for increment and decrement operators, return
1109 * a floating point 1--the error will be detected later.
1112 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1114 switch (type
->base_type
) {
1115 case GLSL_TYPE_UINT
:
1116 return new(ctx
) ir_constant((unsigned) 1);
1118 return new(ctx
) ir_constant(1);
1120 case GLSL_TYPE_FLOAT
:
1121 return new(ctx
) ir_constant(1.0f
);
1126 ast_expression::hir(exec_list
*instructions
,
1127 struct _mesa_glsl_parse_state
*state
)
1129 return do_hir(instructions
, state
, true);
1133 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1134 struct _mesa_glsl_parse_state
*state
)
1136 do_hir(instructions
, state
, false);
1140 ast_expression::do_hir(exec_list
*instructions
,
1141 struct _mesa_glsl_parse_state
*state
,
1145 static const int operations
[AST_NUM_OPERATORS
] = {
1146 -1, /* ast_assign doesn't convert to ir_expression. */
1147 -1, /* ast_plus doesn't convert to ir_expression. */
1161 ir_binop_any_nequal
,
1171 /* Note: The following block of expression types actually convert
1172 * to multiple IR instructions.
1174 ir_binop_mul
, /* ast_mul_assign */
1175 ir_binop_div
, /* ast_div_assign */
1176 ir_binop_mod
, /* ast_mod_assign */
1177 ir_binop_add
, /* ast_add_assign */
1178 ir_binop_sub
, /* ast_sub_assign */
1179 ir_binop_lshift
, /* ast_ls_assign */
1180 ir_binop_rshift
, /* ast_rs_assign */
1181 ir_binop_bit_and
, /* ast_and_assign */
1182 ir_binop_bit_xor
, /* ast_xor_assign */
1183 ir_binop_bit_or
, /* ast_or_assign */
1185 -1, /* ast_conditional doesn't convert to ir_expression. */
1186 ir_binop_add
, /* ast_pre_inc. */
1187 ir_binop_sub
, /* ast_pre_dec. */
1188 ir_binop_add
, /* ast_post_inc. */
1189 ir_binop_sub
, /* ast_post_dec. */
1190 -1, /* ast_field_selection doesn't conv to ir_expression. */
1191 -1, /* ast_array_index doesn't convert to ir_expression. */
1192 -1, /* ast_function_call doesn't conv to ir_expression. */
1193 -1, /* ast_identifier doesn't convert to ir_expression. */
1194 -1, /* ast_int_constant doesn't convert to ir_expression. */
1195 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1196 -1, /* ast_float_constant doesn't conv to ir_expression. */
1197 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1198 -1, /* ast_sequence doesn't convert to ir_expression. */
1200 ir_rvalue
*result
= NULL
;
1202 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1203 bool error_emitted
= false;
1206 loc
= this->get_location();
1208 switch (this->oper
) {
1210 assert(!"ast_aggregate: Should never get here.");
1214 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1215 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1218 do_assignment(instructions
, state
,
1219 this->subexpressions
[0]->non_lvalue_description
,
1220 op
[0], op
[1], &result
, needs_rvalue
, false,
1221 this->subexpressions
[0]->get_location());
1226 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1228 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1230 error_emitted
= type
->is_error();
1236 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1238 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1240 error_emitted
= type
->is_error();
1242 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1250 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1251 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1253 type
= arithmetic_result_type(op
[0], op
[1],
1254 (this->oper
== ast_mul
),
1256 error_emitted
= type
->is_error();
1258 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1263 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1264 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1266 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1268 assert(operations
[this->oper
] == ir_binop_mod
);
1270 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1272 error_emitted
= type
->is_error();
1277 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1278 error_emitted
= true;
1281 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1282 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1283 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1285 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1287 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1294 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1295 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1297 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1299 /* The relational operators must either generate an error or result
1300 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1302 assert(type
->is_error()
1303 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1304 && type
->is_scalar()));
1306 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1308 error_emitted
= type
->is_error();
1313 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1314 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1316 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1318 * "The equality operators equal (==), and not equal (!=)
1319 * operate on all types. They result in a scalar Boolean. If
1320 * the operand types do not match, then there must be a
1321 * conversion from Section 4.1.10 "Implicit Conversions"
1322 * applied to one operand that can make them match, in which
1323 * case this conversion is done."
1325 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1326 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1327 || (op
[0]->type
!= op
[1]->type
)) {
1328 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1329 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1330 error_emitted
= true;
1331 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1332 !state
->check_version(120, 300, &loc
,
1333 "array comparisons forbidden")) {
1334 error_emitted
= true;
1335 } else if ((op
[0]->type
->contains_opaque() ||
1336 op
[1]->type
->contains_opaque())) {
1337 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1338 error_emitted
= true;
1341 if (error_emitted
) {
1342 result
= new(ctx
) ir_constant(false);
1344 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1345 assert(result
->type
== glsl_type::bool_type
);
1352 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1353 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1354 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1356 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1358 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1362 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1364 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1365 error_emitted
= true;
1368 if (!op
[0]->type
->is_integer()) {
1369 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1370 error_emitted
= true;
1373 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1374 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1377 case ast_logic_and
: {
1378 exec_list rhs_instructions
;
1379 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1380 "LHS", &error_emitted
);
1381 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1382 "RHS", &error_emitted
);
1384 if (rhs_instructions
.is_empty()) {
1385 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1386 type
= result
->type
;
1388 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1391 instructions
->push_tail(tmp
);
1393 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1394 instructions
->push_tail(stmt
);
1396 stmt
->then_instructions
.append_list(&rhs_instructions
);
1397 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1398 ir_assignment
*const then_assign
=
1399 new(ctx
) ir_assignment(then_deref
, op
[1]);
1400 stmt
->then_instructions
.push_tail(then_assign
);
1402 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1403 ir_assignment
*const else_assign
=
1404 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1405 stmt
->else_instructions
.push_tail(else_assign
);
1407 result
= new(ctx
) ir_dereference_variable(tmp
);
1413 case ast_logic_or
: {
1414 exec_list rhs_instructions
;
1415 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1416 "LHS", &error_emitted
);
1417 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1418 "RHS", &error_emitted
);
1420 if (rhs_instructions
.is_empty()) {
1421 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1422 type
= result
->type
;
1424 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1427 instructions
->push_tail(tmp
);
1429 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1430 instructions
->push_tail(stmt
);
1432 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1433 ir_assignment
*const then_assign
=
1434 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1435 stmt
->then_instructions
.push_tail(then_assign
);
1437 stmt
->else_instructions
.append_list(&rhs_instructions
);
1438 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1439 ir_assignment
*const else_assign
=
1440 new(ctx
) ir_assignment(else_deref
, op
[1]);
1441 stmt
->else_instructions
.push_tail(else_assign
);
1443 result
= new(ctx
) ir_dereference_variable(tmp
);
1450 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1452 * "The logical binary operators and (&&), or ( | | ), and
1453 * exclusive or (^^). They operate only on two Boolean
1454 * expressions and result in a Boolean expression."
1456 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1458 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1461 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1466 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1467 "operand", &error_emitted
);
1469 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1473 case ast_mul_assign
:
1474 case ast_div_assign
:
1475 case ast_add_assign
:
1476 case ast_sub_assign
: {
1477 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1478 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1480 type
= arithmetic_result_type(op
[0], op
[1],
1481 (this->oper
== ast_mul_assign
),
1484 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1488 do_assignment(instructions
, state
,
1489 this->subexpressions
[0]->non_lvalue_description
,
1490 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1491 &result
, needs_rvalue
, false,
1492 this->subexpressions
[0]->get_location());
1494 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1495 * explicitly test for this because none of the binary expression
1496 * operators allow array operands either.
1502 case ast_mod_assign
: {
1503 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1504 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1506 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1508 assert(operations
[this->oper
] == ir_binop_mod
);
1510 ir_rvalue
*temp_rhs
;
1511 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1515 do_assignment(instructions
, state
,
1516 this->subexpressions
[0]->non_lvalue_description
,
1517 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1518 &result
, needs_rvalue
, false,
1519 this->subexpressions
[0]->get_location());
1524 case ast_rs_assign
: {
1525 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1526 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1527 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1529 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1530 type
, op
[0], op
[1]);
1532 do_assignment(instructions
, state
,
1533 this->subexpressions
[0]->non_lvalue_description
,
1534 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1535 &result
, needs_rvalue
, false,
1536 this->subexpressions
[0]->get_location());
1540 case ast_and_assign
:
1541 case ast_xor_assign
:
1542 case ast_or_assign
: {
1543 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1544 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1545 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1547 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1548 type
, op
[0], op
[1]);
1550 do_assignment(instructions
, state
,
1551 this->subexpressions
[0]->non_lvalue_description
,
1552 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1553 &result
, needs_rvalue
, false,
1554 this->subexpressions
[0]->get_location());
1558 case ast_conditional
: {
1559 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1561 * "The ternary selection operator (?:). It operates on three
1562 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1563 * first expression, which must result in a scalar Boolean."
1565 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1566 "condition", &error_emitted
);
1568 /* The :? operator is implemented by generating an anonymous temporary
1569 * followed by an if-statement. The last instruction in each branch of
1570 * the if-statement assigns a value to the anonymous temporary. This
1571 * temporary is the r-value of the expression.
1573 exec_list then_instructions
;
1574 exec_list else_instructions
;
1576 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1577 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1579 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1581 * "The second and third expressions can be any type, as
1582 * long their types match, or there is a conversion in
1583 * Section 4.1.10 "Implicit Conversions" that can be applied
1584 * to one of the expressions to make their types match. This
1585 * resulting matching type is the type of the entire
1588 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1589 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1590 || (op
[1]->type
!= op
[2]->type
)) {
1591 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1593 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1594 "operator must have matching types");
1595 error_emitted
= true;
1596 type
= glsl_type::error_type
;
1601 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1603 * "The second and third expressions must be the same type, but can
1604 * be of any type other than an array."
1606 if (type
->is_array() &&
1607 !state
->check_version(120, 300, &loc
,
1608 "second and third operands of ?: operator "
1609 "cannot be arrays")) {
1610 error_emitted
= true;
1613 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1615 if (then_instructions
.is_empty()
1616 && else_instructions
.is_empty()
1617 && cond_val
!= NULL
) {
1618 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1620 ir_variable
*const tmp
=
1621 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1622 instructions
->push_tail(tmp
);
1624 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1625 instructions
->push_tail(stmt
);
1627 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1628 ir_dereference
*const then_deref
=
1629 new(ctx
) ir_dereference_variable(tmp
);
1630 ir_assignment
*const then_assign
=
1631 new(ctx
) ir_assignment(then_deref
, op
[1]);
1632 stmt
->then_instructions
.push_tail(then_assign
);
1634 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1635 ir_dereference
*const else_deref
=
1636 new(ctx
) ir_dereference_variable(tmp
);
1637 ir_assignment
*const else_assign
=
1638 new(ctx
) ir_assignment(else_deref
, op
[2]);
1639 stmt
->else_instructions
.push_tail(else_assign
);
1641 result
= new(ctx
) ir_dereference_variable(tmp
);
1648 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1649 ? "pre-increment operation" : "pre-decrement operation";
1651 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1652 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1654 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1656 ir_rvalue
*temp_rhs
;
1657 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1661 do_assignment(instructions
, state
,
1662 this->subexpressions
[0]->non_lvalue_description
,
1663 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1664 &result
, needs_rvalue
, false,
1665 this->subexpressions
[0]->get_location());
1670 case ast_post_dec
: {
1671 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1672 ? "post-increment operation" : "post-decrement operation";
1673 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1674 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1676 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1678 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1680 ir_rvalue
*temp_rhs
;
1681 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1684 /* Get a temporary of a copy of the lvalue before it's modified.
1685 * This may get thrown away later.
1687 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1689 ir_rvalue
*junk_rvalue
;
1691 do_assignment(instructions
, state
,
1692 this->subexpressions
[0]->non_lvalue_description
,
1693 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1694 &junk_rvalue
, false, false,
1695 this->subexpressions
[0]->get_location());
1700 case ast_field_selection
:
1701 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1704 case ast_array_index
: {
1705 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1707 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1708 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1710 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1713 if (result
->type
->is_error())
1714 error_emitted
= true;
1719 case ast_function_call
:
1720 /* Should *NEVER* get here. ast_function_call should always be handled
1721 * by ast_function_expression::hir.
1726 case ast_identifier
: {
1727 /* ast_identifier can appear several places in a full abstract syntax
1728 * tree. This particular use must be at location specified in the grammar
1729 * as 'variable_identifier'.
1732 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1735 var
->data
.used
= true;
1736 result
= new(ctx
) ir_dereference_variable(var
);
1738 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1739 this->primary_expression
.identifier
);
1741 result
= ir_rvalue::error_value(ctx
);
1742 error_emitted
= true;
1747 case ast_int_constant
:
1748 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1751 case ast_uint_constant
:
1752 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1755 case ast_float_constant
:
1756 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1759 case ast_bool_constant
:
1760 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1763 case ast_double_constant
:
1764 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1767 case ast_sequence
: {
1768 /* It should not be possible to generate a sequence in the AST without
1769 * any expressions in it.
1771 assert(!this->expressions
.is_empty());
1773 /* The r-value of a sequence is the last expression in the sequence. If
1774 * the other expressions in the sequence do not have side-effects (and
1775 * therefore add instructions to the instruction list), they get dropped
1778 exec_node
*previous_tail_pred
= NULL
;
1779 YYLTYPE previous_operand_loc
= loc
;
1781 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1782 /* If one of the operands of comma operator does not generate any
1783 * code, we want to emit a warning. At each pass through the loop
1784 * previous_tail_pred will point to the last instruction in the
1785 * stream *before* processing the previous operand. Naturally,
1786 * instructions->tail_pred will point to the last instruction in the
1787 * stream *after* processing the previous operand. If the two
1788 * pointers match, then the previous operand had no effect.
1790 * The warning behavior here differs slightly from GCC. GCC will
1791 * only emit a warning if none of the left-hand operands have an
1792 * effect. However, it will emit a warning for each. I believe that
1793 * there are some cases in C (especially with GCC extensions) where
1794 * it is useful to have an intermediate step in a sequence have no
1795 * effect, but I don't think these cases exist in GLSL. Either way,
1796 * it would be a giant hassle to replicate that behavior.
1798 if (previous_tail_pred
== instructions
->tail_pred
) {
1799 _mesa_glsl_warning(&previous_operand_loc
, state
,
1800 "left-hand operand of comma expression has "
1804 /* tail_pred is directly accessed instead of using the get_tail()
1805 * method for performance reasons. get_tail() has extra code to
1806 * return NULL when the list is empty. We don't care about that
1807 * here, so using tail_pred directly is fine.
1809 previous_tail_pred
= instructions
->tail_pred
;
1810 previous_operand_loc
= ast
->get_location();
1812 result
= ast
->hir(instructions
, state
);
1815 /* Any errors should have already been emitted in the loop above.
1817 error_emitted
= true;
1821 type
= NULL
; /* use result->type, not type. */
1822 assert(result
!= NULL
|| !needs_rvalue
);
1824 if (result
&& result
->type
->is_error() && !error_emitted
)
1825 _mesa_glsl_error(& loc
, state
, "type mismatch");
1832 ast_expression_statement::hir(exec_list
*instructions
,
1833 struct _mesa_glsl_parse_state
*state
)
1835 /* It is possible to have expression statements that don't have an
1836 * expression. This is the solitary semicolon:
1838 * for (i = 0; i < 5; i++)
1841 * In this case the expression will be NULL. Test for NULL and don't do
1842 * anything in that case.
1844 if (expression
!= NULL
)
1845 expression
->hir_no_rvalue(instructions
, state
);
1847 /* Statements do not have r-values.
1854 ast_compound_statement::hir(exec_list
*instructions
,
1855 struct _mesa_glsl_parse_state
*state
)
1858 state
->symbols
->push_scope();
1860 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1861 ast
->hir(instructions
, state
);
1864 state
->symbols
->pop_scope();
1866 /* Compound statements do not have r-values.
1872 * Evaluate the given exec_node (which should be an ast_node representing
1873 * a single array dimension) and return its integer value.
1876 process_array_size(exec_node
*node
,
1877 struct _mesa_glsl_parse_state
*state
)
1879 exec_list dummy_instructions
;
1881 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
1882 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1883 YYLTYPE loc
= array_size
->get_location();
1886 _mesa_glsl_error(& loc
, state
,
1887 "array size could not be resolved");
1891 if (!ir
->type
->is_integer()) {
1892 _mesa_glsl_error(& loc
, state
,
1893 "array size must be integer type");
1897 if (!ir
->type
->is_scalar()) {
1898 _mesa_glsl_error(& loc
, state
,
1899 "array size must be scalar type");
1903 ir_constant
*const size
= ir
->constant_expression_value();
1905 _mesa_glsl_error(& loc
, state
, "array size must be a "
1906 "constant valued expression");
1910 if (size
->value
.i
[0] <= 0) {
1911 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1915 assert(size
->type
== ir
->type
);
1917 /* If the array size is const (and we've verified that
1918 * it is) then no instructions should have been emitted
1919 * when we converted it to HIR. If they were emitted,
1920 * then either the array size isn't const after all, or
1921 * we are emitting unnecessary instructions.
1923 assert(dummy_instructions
.is_empty());
1925 return size
->value
.u
[0];
1928 static const glsl_type
*
1929 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
1930 ast_array_specifier
*array_specifier
,
1931 struct _mesa_glsl_parse_state
*state
)
1933 const glsl_type
*array_type
= base
;
1935 if (array_specifier
!= NULL
) {
1936 if (base
->is_array()) {
1938 /* From page 19 (page 25) of the GLSL 1.20 spec:
1940 * "Only one-dimensional arrays may be declared."
1942 if (!state
->ARB_arrays_of_arrays_enable
) {
1943 _mesa_glsl_error(loc
, state
,
1944 "invalid array of `%s'"
1945 "GL_ARB_arrays_of_arrays "
1946 "required for defining arrays of arrays",
1948 return glsl_type::error_type
;
1951 if (base
->length
== 0) {
1952 _mesa_glsl_error(loc
, state
,
1953 "only the outermost array dimension can "
1956 return glsl_type::error_type
;
1960 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
1961 !node
->is_head_sentinel(); node
= node
->prev
) {
1962 unsigned array_size
= process_array_size(node
, state
);
1963 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
1966 if (array_specifier
->is_unsized_array
)
1967 array_type
= glsl_type::get_array_instance(array_type
, 0);
1975 ast_type_specifier::glsl_type(const char **name
,
1976 struct _mesa_glsl_parse_state
*state
) const
1978 const struct glsl_type
*type
;
1980 type
= state
->symbols
->get_type(this->type_name
);
1981 *name
= this->type_name
;
1983 YYLTYPE loc
= this->get_location();
1984 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
1990 ast_fully_specified_type::glsl_type(const char **name
,
1991 struct _mesa_glsl_parse_state
*state
) const
1993 const struct glsl_type
*type
= this->specifier
->glsl_type(name
, state
);
1998 if (type
->base_type
== GLSL_TYPE_FLOAT
2000 && state
->stage
== MESA_SHADER_FRAGMENT
2001 && this->qualifier
.precision
== ast_precision_none
2002 && state
->symbols
->get_variable("#default precision") == NULL
) {
2003 YYLTYPE loc
= this->get_location();
2004 _mesa_glsl_error(&loc
, state
,
2005 "no precision specified this scope for type `%s'",
2013 * Determine whether a toplevel variable declaration declares a varying. This
2014 * function operates by examining the variable's mode and the shader target,
2015 * so it correctly identifies linkage variables regardless of whether they are
2016 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2018 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2019 * this function will produce undefined results.
2022 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2025 case MESA_SHADER_VERTEX
:
2026 return var
->data
.mode
== ir_var_shader_out
;
2027 case MESA_SHADER_FRAGMENT
:
2028 return var
->data
.mode
== ir_var_shader_in
;
2030 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2036 * Matrix layout qualifiers are only allowed on certain types
2039 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2041 const glsl_type
*type
,
2044 if (var
&& !var
->is_in_uniform_block()) {
2045 /* Layout qualifiers may only apply to interface blocks and fields in
2048 _mesa_glsl_error(loc
, state
,
2049 "uniform block layout qualifiers row_major and "
2050 "column_major may not be applied to variables "
2051 "outside of uniform blocks");
2052 } else if (!type
->is_matrix()) {
2053 /* The OpenGL ES 3.0 conformance tests did not originally allow
2054 * matrix layout qualifiers on non-matrices. However, the OpenGL
2055 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2056 * amended to specifically allow these layouts on all types. Emit
2057 * a warning so that people know their code may not be portable.
2059 _mesa_glsl_warning(loc
, state
,
2060 "uniform block layout qualifiers row_major and "
2061 "column_major applied to non-matrix types may "
2062 "be rejected by older compilers");
2063 } else if (type
->is_record()) {
2064 /* We allow 'layout(row_major)' on structure types because it's the only
2065 * way to get row-major layouts on matrices contained in structures.
2067 _mesa_glsl_warning(loc
, state
,
2068 "uniform block layout qualifiers row_major and "
2069 "column_major applied to structure types is not "
2070 "strictly conformant and may be rejected by other "
2076 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
2079 const ast_type_qualifier
*qual
)
2081 if (var
->data
.mode
!= ir_var_uniform
) {
2082 _mesa_glsl_error(loc
, state
,
2083 "the \"binding\" qualifier only applies to uniforms");
2087 if (qual
->binding
< 0) {
2088 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
2092 const struct gl_context
*const ctx
= state
->ctx
;
2093 unsigned elements
= var
->type
->is_array() ? var
->type
->length
: 1;
2094 unsigned max_index
= qual
->binding
+ elements
- 1;
2096 if (var
->type
->is_interface()) {
2097 /* UBOs. From page 60 of the GLSL 4.20 specification:
2098 * "If the binding point for any uniform block instance is less than zero,
2099 * or greater than or equal to the implementation-dependent maximum
2100 * number of uniform buffer bindings, a compilation error will occur.
2101 * When the binding identifier is used with a uniform block instanced as
2102 * an array of size N, all elements of the array from binding through
2103 * binding + N – 1 must be within this range."
2105 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2107 if (max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2108 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
2109 "the maximum number of UBO binding points (%d)",
2110 qual
->binding
, elements
,
2111 ctx
->Const
.MaxUniformBufferBindings
);
2114 } else if (var
->type
->is_sampler() ||
2115 (var
->type
->is_array() && var
->type
->fields
.array
->is_sampler())) {
2116 /* Samplers. From page 63 of the GLSL 4.20 specification:
2117 * "If the binding is less than zero, or greater than or equal to the
2118 * implementation-dependent maximum supported number of units, a
2119 * compilation error will occur. When the binding identifier is used
2120 * with an array of size N, all elements of the array from binding
2121 * through binding + N - 1 must be within this range."
2123 unsigned limit
= ctx
->Const
.Program
[state
->stage
].MaxTextureImageUnits
;
2125 if (max_index
>= limit
) {
2126 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2127 "exceeds the maximum number of texture image units "
2128 "(%d)", qual
->binding
, elements
, limit
);
2132 } else if (var
->type
->contains_atomic()) {
2133 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2134 if (unsigned(qual
->binding
) >= ctx
->Const
.MaxAtomicBufferBindings
) {
2135 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2136 " maximum number of atomic counter buffer bindings"
2137 "(%d)", qual
->binding
,
2138 ctx
->Const
.MaxAtomicBufferBindings
);
2143 _mesa_glsl_error(loc
, state
,
2144 "the \"binding\" qualifier only applies to uniform "
2145 "blocks, samplers, atomic counters, or arrays thereof");
2153 static glsl_interp_qualifier
2154 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2155 ir_variable_mode mode
,
2156 struct _mesa_glsl_parse_state
*state
,
2159 glsl_interp_qualifier interpolation
;
2160 if (qual
->flags
.q
.flat
)
2161 interpolation
= INTERP_QUALIFIER_FLAT
;
2162 else if (qual
->flags
.q
.noperspective
)
2163 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2164 else if (qual
->flags
.q
.smooth
)
2165 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2167 interpolation
= INTERP_QUALIFIER_NONE
;
2169 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2170 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2171 _mesa_glsl_error(loc
, state
,
2172 "interpolation qualifier `%s' can only be applied to "
2173 "shader inputs or outputs.",
2174 interpolation_string(interpolation
));
2178 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2179 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2180 _mesa_glsl_error(loc
, state
,
2181 "interpolation qualifier `%s' cannot be applied to "
2182 "vertex shader inputs or fragment shader outputs",
2183 interpolation_string(interpolation
));
2187 return interpolation
;
2192 validate_explicit_location(const struct ast_type_qualifier
*qual
,
2194 struct _mesa_glsl_parse_state
*state
,
2199 /* Checks for GL_ARB_explicit_uniform_location. */
2200 if (qual
->flags
.q
.uniform
) {
2201 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2204 const struct gl_context
*const ctx
= state
->ctx
;
2205 unsigned max_loc
= qual
->location
+ var
->type
->uniform_locations() - 1;
2207 /* ARB_explicit_uniform_location specification states:
2209 * "The explicitly defined locations and the generated locations
2210 * must be in the range of 0 to MAX_UNIFORM_LOCATIONS minus one."
2212 * "Valid locations for default-block uniform variable locations
2213 * are in the range of 0 to the implementation-defined maximum
2214 * number of uniform locations."
2216 if (qual
->location
< 0) {
2217 _mesa_glsl_error(loc
, state
,
2218 "explicit location < 0 for uniform %s", var
->name
);
2222 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2223 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2224 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2225 ctx
->Const
.MaxUserAssignableUniformLocations
);
2229 var
->data
.explicit_location
= true;
2230 var
->data
.location
= qual
->location
;
2234 /* Between GL_ARB_explicit_attrib_location an
2235 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2236 * stage can be assigned explicit locations. The checking here associates
2237 * the correct extension with the correct stage's input / output:
2241 * vertex explicit_loc sso
2243 * fragment sso explicit_loc
2245 switch (state
->stage
) {
2246 case MESA_SHADER_VERTEX
:
2247 if (var
->data
.mode
== ir_var_shader_in
) {
2248 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2254 if (var
->data
.mode
== ir_var_shader_out
) {
2255 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2264 case MESA_SHADER_GEOMETRY
:
2265 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2266 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2275 case MESA_SHADER_FRAGMENT
:
2276 if (var
->data
.mode
== ir_var_shader_in
) {
2277 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2283 if (var
->data
.mode
== ir_var_shader_out
) {
2284 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2293 case MESA_SHADER_COMPUTE
:
2294 _mesa_glsl_error(loc
, state
,
2295 "compute shader variables cannot be given "
2296 "explicit locations");
2301 _mesa_glsl_error(loc
, state
,
2302 "%s cannot be given an explicit location in %s shader",
2304 _mesa_shader_stage_to_string(state
->stage
));
2306 var
->data
.explicit_location
= true;
2308 /* This bit of silliness is needed because invalid explicit locations
2309 * are supposed to be flagged during linking. Small negative values
2310 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2311 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2312 * The linker needs to be able to differentiate these cases. This
2313 * ensures that negative values stay negative.
2315 if (qual
->location
>= 0) {
2316 switch (state
->stage
) {
2317 case MESA_SHADER_VERTEX
:
2318 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2319 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2320 : (qual
->location
+ VARYING_SLOT_VAR0
);
2323 case MESA_SHADER_GEOMETRY
:
2324 var
->data
.location
= qual
->location
+ VARYING_SLOT_VAR0
;
2327 case MESA_SHADER_FRAGMENT
:
2328 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2329 ? (qual
->location
+ FRAG_RESULT_DATA0
)
2330 : (qual
->location
+ VARYING_SLOT_VAR0
);
2332 case MESA_SHADER_COMPUTE
:
2333 assert(!"Unexpected shader type");
2337 var
->data
.location
= qual
->location
;
2340 if (qual
->flags
.q
.explicit_index
) {
2341 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2342 * Layout Qualifiers):
2344 * "It is also a compile-time error if a fragment shader
2345 * sets a layout index to less than 0 or greater than 1."
2347 * Older specifications don't mandate a behavior; we take
2348 * this as a clarification and always generate the error.
2350 if (qual
->index
< 0 || qual
->index
> 1) {
2351 _mesa_glsl_error(loc
, state
,
2352 "explicit index may only be 0 or 1");
2354 var
->data
.explicit_index
= true;
2355 var
->data
.index
= qual
->index
;
2362 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2364 struct _mesa_glsl_parse_state
*state
,
2367 const glsl_type
*base_type
=
2368 (var
->type
->is_array() ? var
->type
->element_type() : var
->type
);
2370 if (base_type
->is_image()) {
2371 if (var
->data
.mode
!= ir_var_uniform
&&
2372 var
->data
.mode
!= ir_var_function_in
) {
2373 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2374 "function parameters or uniform-qualified "
2375 "global variables");
2378 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2379 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2380 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2381 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2382 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2383 var
->data
.read_only
= true;
2385 if (qual
->flags
.q
.explicit_image_format
) {
2386 if (var
->data
.mode
== ir_var_function_in
) {
2387 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2388 "used on image function parameters");
2391 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2392 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2393 "base data type of the image");
2396 var
->data
.image_format
= qual
->image_format
;
2398 if (var
->data
.mode
== ir_var_uniform
&& !qual
->flags
.q
.write_only
) {
2399 _mesa_glsl_error(loc
, state
, "uniforms not qualified with "
2400 "`writeonly' must have a format layout "
2404 var
->data
.image_format
= GL_NONE
;
2409 static inline const char*
2410 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
2412 if (origin_upper_left
&& pixel_center_integer
)
2413 return "origin_upper_left, pixel_center_integer";
2414 else if (origin_upper_left
)
2415 return "origin_upper_left";
2416 else if (pixel_center_integer
)
2417 return "pixel_center_integer";
2423 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
2424 const struct ast_type_qualifier
*qual
)
2426 /* If gl_FragCoord was previously declared, and the qualifiers were
2427 * different in any way, return true.
2429 if (state
->fs_redeclares_gl_fragcoord
) {
2430 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
2431 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
2438 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2440 struct _mesa_glsl_parse_state
*state
,
2444 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
2446 if (qual
->flags
.q
.invariant
) {
2447 if (var
->data
.used
) {
2448 _mesa_glsl_error(loc
, state
,
2449 "variable `%s' may not be redeclared "
2450 "`invariant' after being used",
2453 var
->data
.invariant
= 1;
2457 if (qual
->flags
.q
.precise
) {
2458 if (var
->data
.used
) {
2459 _mesa_glsl_error(loc
, state
,
2460 "variable `%s' may not be redeclared "
2461 "`precise' after being used",
2464 var
->data
.precise
= 1;
2468 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
2469 || qual
->flags
.q
.uniform
2470 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2471 var
->data
.read_only
= 1;
2473 if (qual
->flags
.q
.centroid
)
2474 var
->data
.centroid
= 1;
2476 if (qual
->flags
.q
.sample
)
2477 var
->data
.sample
= 1;
2479 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
2480 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
2481 var
->data
.stream
= qual
->stream
;
2484 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
2485 var
->type
= glsl_type::error_type
;
2486 _mesa_glsl_error(loc
, state
,
2487 "`attribute' variables may not be declared in the "
2489 _mesa_shader_stage_to_string(state
->stage
));
2492 /* Disallow layout qualifiers which may only appear on layout declarations. */
2493 if (qual
->flags
.q
.prim_type
) {
2494 _mesa_glsl_error(loc
, state
,
2495 "Primitive type may only be specified on GS input or output "
2496 "layout declaration, not on variables.");
2499 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2501 * "However, the const qualifier cannot be used with out or inout."
2503 * The same section of the GLSL 4.40 spec further clarifies this saying:
2505 * "The const qualifier cannot be used with out or inout, or a
2506 * compile-time error results."
2508 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2509 _mesa_glsl_error(loc
, state
,
2510 "`const' may not be applied to `out' or `inout' "
2511 "function parameters");
2514 /* If there is no qualifier that changes the mode of the variable, leave
2515 * the setting alone.
2517 assert(var
->data
.mode
!= ir_var_temporary
);
2518 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2519 var
->data
.mode
= ir_var_function_inout
;
2520 else if (qual
->flags
.q
.in
)
2521 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2522 else if (qual
->flags
.q
.attribute
2523 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2524 var
->data
.mode
= ir_var_shader_in
;
2525 else if (qual
->flags
.q
.out
)
2526 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2527 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
2528 var
->data
.mode
= ir_var_shader_out
;
2529 else if (qual
->flags
.q
.uniform
)
2530 var
->data
.mode
= ir_var_uniform
;
2532 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
2533 /* User-defined ins/outs are not permitted in compute shaders. */
2534 if (state
->stage
== MESA_SHADER_COMPUTE
) {
2535 _mesa_glsl_error(loc
, state
,
2536 "user-defined input and output variables are not "
2537 "permitted in compute shaders");
2540 /* This variable is being used to link data between shader stages (in
2541 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2542 * that is allowed for such purposes.
2544 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2546 * "The varying qualifier can be used only with the data types
2547 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2550 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2551 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2553 * "Fragment inputs can only be signed and unsigned integers and
2554 * integer vectors, float, floating-point vectors, matrices, or
2555 * arrays of these. Structures cannot be input.
2557 * Similar text exists in the section on vertex shader outputs.
2559 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2560 * 3.00 spec allows structs as well. Varying structs are also allowed
2563 switch (var
->type
->get_scalar_type()->base_type
) {
2564 case GLSL_TYPE_FLOAT
:
2565 /* Ok in all GLSL versions */
2567 case GLSL_TYPE_UINT
:
2569 if (state
->is_version(130, 300))
2571 _mesa_glsl_error(loc
, state
,
2572 "varying variables must be of base type float in %s",
2573 state
->get_version_string());
2575 case GLSL_TYPE_STRUCT
:
2576 if (state
->is_version(150, 300))
2578 _mesa_glsl_error(loc
, state
,
2579 "varying variables may not be of type struct");
2581 case GLSL_TYPE_DOUBLE
:
2584 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2589 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2590 switch (state
->stage
) {
2591 case MESA_SHADER_VERTEX
:
2592 if (var
->data
.mode
== ir_var_shader_out
)
2593 var
->data
.invariant
= true;
2595 case MESA_SHADER_GEOMETRY
:
2596 if ((var
->data
.mode
== ir_var_shader_in
)
2597 || (var
->data
.mode
== ir_var_shader_out
))
2598 var
->data
.invariant
= true;
2600 case MESA_SHADER_FRAGMENT
:
2601 if (var
->data
.mode
== ir_var_shader_in
)
2602 var
->data
.invariant
= true;
2604 case MESA_SHADER_COMPUTE
:
2605 /* Invariance isn't meaningful in compute shaders. */
2610 var
->data
.interpolation
=
2611 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
2614 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2615 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2616 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2617 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2618 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2619 ? "origin_upper_left" : "pixel_center_integer";
2621 _mesa_glsl_error(loc
, state
,
2622 "layout qualifier `%s' can only be applied to "
2623 "fragment shader input `gl_FragCoord'",
2627 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
2629 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
2631 * "Within any shader, the first redeclarations of gl_FragCoord
2632 * must appear before any use of gl_FragCoord."
2634 * Generate a compiler error if above condition is not met by the
2637 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
2638 if (earlier
!= NULL
&&
2639 earlier
->data
.used
&&
2640 !state
->fs_redeclares_gl_fragcoord
) {
2641 _mesa_glsl_error(loc
, state
,
2642 "gl_FragCoord used before its first redeclaration "
2643 "in fragment shader");
2646 /* Make sure all gl_FragCoord redeclarations specify the same layout
2649 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
2650 const char *const qual_string
=
2651 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
2652 qual
->flags
.q
.pixel_center_integer
);
2654 const char *const state_string
=
2655 get_layout_qualifier_string(state
->fs_origin_upper_left
,
2656 state
->fs_pixel_center_integer
);
2658 _mesa_glsl_error(loc
, state
,
2659 "gl_FragCoord redeclared with different layout "
2660 "qualifiers (%s) and (%s) ",
2664 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2665 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2666 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
2667 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
2668 state
->fs_redeclares_gl_fragcoord
=
2669 state
->fs_origin_upper_left
||
2670 state
->fs_pixel_center_integer
||
2671 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
2674 if (qual
->flags
.q
.explicit_location
) {
2675 validate_explicit_location(qual
, var
, state
, loc
);
2676 } else if (qual
->flags
.q
.explicit_index
) {
2677 _mesa_glsl_error(loc
, state
, "explicit index requires explicit location");
2680 if (qual
->flags
.q
.explicit_binding
&&
2681 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2682 var
->data
.explicit_binding
= true;
2683 var
->data
.binding
= qual
->binding
;
2686 if (var
->type
->contains_atomic()) {
2687 if (var
->data
.mode
== ir_var_uniform
) {
2688 if (var
->data
.explicit_binding
) {
2690 &state
->atomic_counter_offsets
[var
->data
.binding
];
2692 if (*offset
% ATOMIC_COUNTER_SIZE
)
2693 _mesa_glsl_error(loc
, state
,
2694 "misaligned atomic counter offset");
2696 var
->data
.atomic
.offset
= *offset
;
2697 *offset
+= var
->type
->atomic_size();
2700 _mesa_glsl_error(loc
, state
,
2701 "atomic counters require explicit binding point");
2703 } else if (var
->data
.mode
!= ir_var_function_in
) {
2704 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
2705 "function parameters or uniform-qualified "
2706 "global variables");
2710 /* Does the declaration use the deprecated 'attribute' or 'varying'
2713 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2714 || qual
->flags
.q
.varying
;
2717 /* Validate auxiliary storage qualifiers */
2719 /* From section 4.3.4 of the GLSL 1.30 spec:
2720 * "It is an error to use centroid in in a vertex shader."
2722 * From section 4.3.4 of the GLSL ES 3.00 spec:
2723 * "It is an error to use centroid in or interpolation qualifiers in
2724 * a vertex shader input."
2727 /* Section 4.3.6 of the GLSL 1.30 specification states:
2728 * "It is an error to use centroid out in a fragment shader."
2730 * The GL_ARB_shading_language_420pack extension specification states:
2731 * "It is an error to use auxiliary storage qualifiers or interpolation
2732 * qualifiers on an output in a fragment shader."
2734 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
2735 _mesa_glsl_error(loc
, state
,
2736 "sample qualifier may only be used on `in` or `out` "
2737 "variables between shader stages");
2739 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
2740 _mesa_glsl_error(loc
, state
,
2741 "centroid qualifier may only be used with `in', "
2742 "`out' or `varying' variables between shader stages");
2746 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2747 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2748 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2749 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2750 * These extensions and all following extensions that add the 'layout'
2751 * keyword have been modified to require the use of 'in' or 'out'.
2753 * The following extension do not allow the deprecated keywords:
2755 * GL_AMD_conservative_depth
2756 * GL_ARB_conservative_depth
2757 * GL_ARB_gpu_shader5
2758 * GL_ARB_separate_shader_objects
2759 * GL_ARB_tesselation_shader
2760 * GL_ARB_transform_feedback3
2761 * GL_ARB_uniform_buffer_object
2763 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2764 * allow layout with the deprecated keywords.
2766 const bool relaxed_layout_qualifier_checking
=
2767 state
->ARB_fragment_coord_conventions_enable
;
2769 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2770 if (relaxed_layout_qualifier_checking
) {
2771 _mesa_glsl_warning(loc
, state
,
2772 "`layout' qualifier may not be used with "
2773 "`attribute' or `varying'");
2775 _mesa_glsl_error(loc
, state
,
2776 "`layout' qualifier may not be used with "
2777 "`attribute' or `varying'");
2781 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2782 * AMD_conservative_depth.
2784 int depth_layout_count
= qual
->flags
.q
.depth_any
2785 + qual
->flags
.q
.depth_greater
2786 + qual
->flags
.q
.depth_less
2787 + qual
->flags
.q
.depth_unchanged
;
2788 if (depth_layout_count
> 0
2789 && !state
->AMD_conservative_depth_enable
2790 && !state
->ARB_conservative_depth_enable
) {
2791 _mesa_glsl_error(loc
, state
,
2792 "extension GL_AMD_conservative_depth or "
2793 "GL_ARB_conservative_depth must be enabled "
2794 "to use depth layout qualifiers");
2795 } else if (depth_layout_count
> 0
2796 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2797 _mesa_glsl_error(loc
, state
,
2798 "depth layout qualifiers can be applied only to "
2800 } else if (depth_layout_count
> 1
2801 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2802 _mesa_glsl_error(loc
, state
,
2803 "at most one depth layout qualifier can be applied to "
2806 if (qual
->flags
.q
.depth_any
)
2807 var
->data
.depth_layout
= ir_depth_layout_any
;
2808 else if (qual
->flags
.q
.depth_greater
)
2809 var
->data
.depth_layout
= ir_depth_layout_greater
;
2810 else if (qual
->flags
.q
.depth_less
)
2811 var
->data
.depth_layout
= ir_depth_layout_less
;
2812 else if (qual
->flags
.q
.depth_unchanged
)
2813 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
2815 var
->data
.depth_layout
= ir_depth_layout_none
;
2817 if (qual
->flags
.q
.std140
||
2818 qual
->flags
.q
.packed
||
2819 qual
->flags
.q
.shared
) {
2820 _mesa_glsl_error(loc
, state
,
2821 "uniform block layout qualifiers std140, packed, and "
2822 "shared can only be applied to uniform blocks, not "
2826 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2827 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
2830 if (var
->type
->contains_image())
2831 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
2835 * Get the variable that is being redeclared by this declaration
2837 * Semantic checks to verify the validity of the redeclaration are also
2838 * performed. If semantic checks fail, compilation error will be emitted via
2839 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2842 * A pointer to an existing variable in the current scope if the declaration
2843 * is a redeclaration, \c NULL otherwise.
2845 static ir_variable
*
2846 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
2847 struct _mesa_glsl_parse_state
*state
,
2848 bool allow_all_redeclarations
)
2850 /* Check if this declaration is actually a re-declaration, either to
2851 * resize an array or add qualifiers to an existing variable.
2853 * This is allowed for variables in the current scope, or when at
2854 * global scope (for built-ins in the implicit outer scope).
2856 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
2857 if (earlier
== NULL
||
2858 (state
->current_function
!= NULL
&&
2859 !state
->symbols
->name_declared_this_scope(var
->name
))) {
2864 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2866 * "It is legal to declare an array without a size and then
2867 * later re-declare the same name as an array of the same
2868 * type and specify a size."
2870 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
2871 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2872 /* FINISHME: This doesn't match the qualifiers on the two
2873 * FINISHME: declarations. It's not 100% clear whether this is
2874 * FINISHME: required or not.
2877 const unsigned size
= unsigned(var
->type
->array_size());
2878 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2879 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
2880 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2882 earlier
->data
.max_array_access
);
2885 earlier
->type
= var
->type
;
2888 } else if ((state
->ARB_fragment_coord_conventions_enable
||
2889 state
->is_version(150, 0))
2890 && strcmp(var
->name
, "gl_FragCoord") == 0
2891 && earlier
->type
== var
->type
2892 && earlier
->data
.mode
== var
->data
.mode
) {
2893 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2896 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
2897 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
2899 /* According to section 4.3.7 of the GLSL 1.30 spec,
2900 * the following built-in varaibles can be redeclared with an
2901 * interpolation qualifier:
2904 * * gl_FrontSecondaryColor
2905 * * gl_BackSecondaryColor
2907 * * gl_SecondaryColor
2909 } else if (state
->is_version(130, 0)
2910 && (strcmp(var
->name
, "gl_FrontColor") == 0
2911 || strcmp(var
->name
, "gl_BackColor") == 0
2912 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2913 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2914 || strcmp(var
->name
, "gl_Color") == 0
2915 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2916 && earlier
->type
== var
->type
2917 && earlier
->data
.mode
== var
->data
.mode
) {
2918 earlier
->data
.interpolation
= var
->data
.interpolation
;
2920 /* Layout qualifiers for gl_FragDepth. */
2921 } else if ((state
->AMD_conservative_depth_enable
||
2922 state
->ARB_conservative_depth_enable
)
2923 && strcmp(var
->name
, "gl_FragDepth") == 0
2924 && earlier
->type
== var
->type
2925 && earlier
->data
.mode
== var
->data
.mode
) {
2927 /** From the AMD_conservative_depth spec:
2928 * Within any shader, the first redeclarations of gl_FragDepth
2929 * must appear before any use of gl_FragDepth.
2931 if (earlier
->data
.used
) {
2932 _mesa_glsl_error(&loc
, state
,
2933 "the first redeclaration of gl_FragDepth "
2934 "must appear before any use of gl_FragDepth");
2937 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2938 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
2939 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
2940 _mesa_glsl_error(&loc
, state
,
2941 "gl_FragDepth: depth layout is declared here "
2942 "as '%s, but it was previously declared as "
2944 depth_layout_string(var
->data
.depth_layout
),
2945 depth_layout_string(earlier
->data
.depth_layout
));
2948 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
2950 } else if (allow_all_redeclarations
) {
2951 if (earlier
->data
.mode
!= var
->data
.mode
) {
2952 _mesa_glsl_error(&loc
, state
,
2953 "redeclaration of `%s' with incorrect qualifiers",
2955 } else if (earlier
->type
!= var
->type
) {
2956 _mesa_glsl_error(&loc
, state
,
2957 "redeclaration of `%s' has incorrect type",
2961 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
2968 * Generate the IR for an initializer in a variable declaration
2971 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2972 ast_fully_specified_type
*type
,
2973 exec_list
*initializer_instructions
,
2974 struct _mesa_glsl_parse_state
*state
)
2976 ir_rvalue
*result
= NULL
;
2978 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2980 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2982 * "All uniform variables are read-only and are initialized either
2983 * directly by an application via API commands, or indirectly by
2986 if (var
->data
.mode
== ir_var_uniform
) {
2987 state
->check_version(120, 0, &initializer_loc
,
2988 "cannot initialize uniforms");
2991 /* From section 4.1.7 of the GLSL 4.40 spec:
2993 * "Opaque variables [...] are initialized only through the
2994 * OpenGL API; they cannot be declared with an initializer in a
2997 if (var
->type
->contains_opaque()) {
2998 _mesa_glsl_error(& initializer_loc
, state
,
2999 "cannot initialize opaque variable");
3002 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3003 _mesa_glsl_error(& initializer_loc
, state
,
3004 "cannot initialize %s shader input / %s",
3005 _mesa_shader_stage_to_string(state
->stage
),
3006 (state
->stage
== MESA_SHADER_VERTEX
)
3007 ? "attribute" : "varying");
3010 /* If the initializer is an ast_aggregate_initializer, recursively store
3011 * type information from the LHS into it, so that its hir() function can do
3014 if (decl
->initializer
->oper
== ast_aggregate
)
3015 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3017 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3018 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3020 /* Calculate the constant value if this is a const or uniform
3023 if (type
->qualifier
.flags
.q
.constant
3024 || type
->qualifier
.flags
.q
.uniform
) {
3025 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3026 var
->type
, rhs
, true);
3027 if (new_rhs
!= NULL
) {
3030 ir_constant
*constant_value
= rhs
->constant_expression_value();
3031 if (!constant_value
) {
3032 /* If ARB_shading_language_420pack is enabled, initializers of
3033 * const-qualified local variables do not have to be constant
3034 * expressions. Const-qualified global variables must still be
3035 * initialized with constant expressions.
3037 if (!state
->ARB_shading_language_420pack_enable
3038 || state
->current_function
== NULL
) {
3039 _mesa_glsl_error(& initializer_loc
, state
,
3040 "initializer of %s variable `%s' must be a "
3041 "constant expression",
3042 (type
->qualifier
.flags
.q
.constant
)
3043 ? "const" : "uniform",
3045 if (var
->type
->is_numeric()) {
3046 /* Reduce cascading errors. */
3047 var
->constant_value
= ir_constant::zero(state
, var
->type
);
3051 rhs
= constant_value
;
3052 var
->constant_value
= constant_value
;
3055 if (var
->type
->is_numeric()) {
3056 /* Reduce cascading errors. */
3057 var
->constant_value
= ir_constant::zero(state
, var
->type
);
3062 if (rhs
&& !rhs
->type
->is_error()) {
3063 bool temp
= var
->data
.read_only
;
3064 if (type
->qualifier
.flags
.q
.constant
)
3065 var
->data
.read_only
= false;
3067 /* Never emit code to initialize a uniform.
3069 const glsl_type
*initializer_type
;
3070 if (!type
->qualifier
.flags
.q
.uniform
) {
3071 do_assignment(initializer_instructions
, state
,
3076 type
->get_location());
3077 initializer_type
= result
->type
;
3079 initializer_type
= rhs
->type
;
3081 var
->constant_initializer
= rhs
->constant_expression_value();
3082 var
->data
.has_initializer
= true;
3084 /* If the declared variable is an unsized array, it must inherrit
3085 * its full type from the initializer. A declaration such as
3087 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3091 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3093 * The assignment generated in the if-statement (below) will also
3094 * automatically handle this case for non-uniforms.
3096 * If the declared variable is not an array, the types must
3097 * already match exactly. As a result, the type assignment
3098 * here can be done unconditionally. For non-uniforms the call
3099 * to do_assignment can change the type of the initializer (via
3100 * the implicit conversion rules). For uniforms the initializer
3101 * must be a constant expression, and the type of that expression
3102 * was validated above.
3104 var
->type
= initializer_type
;
3106 var
->data
.read_only
= temp
;
3114 * Do additional processing necessary for geometry shader input declarations
3115 * (this covers both interface blocks arrays and bare input variables).
3118 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3119 YYLTYPE loc
, ir_variable
*var
)
3121 unsigned num_vertices
= 0;
3122 if (state
->gs_input_prim_type_specified
) {
3123 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
3126 /* Geometry shader input variables must be arrays. Caller should have
3127 * reported an error for this.
3129 if (!var
->type
->is_array()) {
3130 assert(state
->error
);
3132 /* To avoid cascading failures, short circuit the checks below. */
3136 if (var
->type
->is_unsized_array()) {
3137 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3139 * All geometry shader input unsized array declarations will be
3140 * sized by an earlier input layout qualifier, when present, as per
3141 * the following table.
3143 * Followed by a table mapping each allowed input layout qualifier to
3144 * the corresponding input length.
3146 if (num_vertices
!= 0)
3147 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3150 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3151 * includes the following examples of compile-time errors:
3153 * // code sequence within one shader...
3154 * in vec4 Color1[]; // size unknown
3155 * ...Color1.length()...// illegal, length() unknown
3156 * in vec4 Color2[2]; // size is 2
3157 * ...Color1.length()...// illegal, Color1 still has no size
3158 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3159 * layout(lines) in; // legal, input size is 2, matching
3160 * in vec4 Color4[3]; // illegal, contradicts layout
3163 * To detect the case illustrated by Color3, we verify that the size of
3164 * an explicitly-sized array matches the size of any previously declared
3165 * explicitly-sized array. To detect the case illustrated by Color4, we
3166 * verify that the size of an explicitly-sized array is consistent with
3167 * any previously declared input layout.
3169 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3170 _mesa_glsl_error(&loc
, state
,
3171 "geometry shader input size contradicts previously"
3172 " declared layout (size is %u, but layout requires a"
3173 " size of %u)", var
->type
->length
, num_vertices
);
3174 } else if (state
->gs_input_size
!= 0 &&
3175 var
->type
->length
!= state
->gs_input_size
) {
3176 _mesa_glsl_error(&loc
, state
,
3177 "geometry shader input sizes are "
3178 "inconsistent (size is %u, but a previous "
3179 "declaration has size %u)",
3180 var
->type
->length
, state
->gs_input_size
);
3182 state
->gs_input_size
= var
->type
->length
;
3189 validate_identifier(const char *identifier
, YYLTYPE loc
,
3190 struct _mesa_glsl_parse_state
*state
)
3192 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3194 * "Identifiers starting with "gl_" are reserved for use by
3195 * OpenGL, and may not be declared in a shader as either a
3196 * variable or a function."
3198 if (is_gl_identifier(identifier
)) {
3199 _mesa_glsl_error(&loc
, state
,
3200 "identifier `%s' uses reserved `gl_' prefix",
3202 } else if (strstr(identifier
, "__")) {
3203 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3206 * "In addition, all identifiers containing two
3207 * consecutive underscores (__) are reserved as
3208 * possible future keywords."
3210 * The intention is that names containing __ are reserved for internal
3211 * use by the implementation, and names prefixed with GL_ are reserved
3212 * for use by Khronos. Names simply containing __ are dangerous to use,
3213 * but should be allowed.
3215 * A future version of the GLSL specification will clarify this.
3217 _mesa_glsl_warning(&loc
, state
,
3218 "identifier `%s' uses reserved `__' string",
3224 precision_qualifier_allowed(const glsl_type
*type
)
3226 /* Precision qualifiers apply to floating point, integer and sampler
3229 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3230 * "Any floating point or any integer declaration can have the type
3231 * preceded by one of these precision qualifiers [...] Literal
3232 * constants do not have precision qualifiers. Neither do Boolean
3235 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3238 * "Precision qualifiers are added for code portability with OpenGL
3239 * ES, not for functionality. They have the same syntax as in OpenGL
3242 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3244 * "uniform lowp sampler2D sampler;
3247 * lowp vec4 col = texture2D (sampler, coord);
3248 * // texture2D returns lowp"
3250 * From this, we infer that GLSL 1.30 (and later) should allow precision
3251 * qualifiers on sampler types just like float and integer types.
3253 return type
->is_float()
3254 || type
->is_integer()
3255 || type
->is_record()
3256 || type
->is_sampler();
3260 ast_declarator_list::hir(exec_list
*instructions
,
3261 struct _mesa_glsl_parse_state
*state
)
3264 const struct glsl_type
*decl_type
;
3265 const char *type_name
= NULL
;
3266 ir_rvalue
*result
= NULL
;
3267 YYLTYPE loc
= this->get_location();
3269 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
3271 * "To ensure that a particular output variable is invariant, it is
3272 * necessary to use the invariant qualifier. It can either be used to
3273 * qualify a previously declared variable as being invariant
3275 * invariant gl_Position; // make existing gl_Position be invariant"
3277 * In these cases the parser will set the 'invariant' flag in the declarator
3278 * list, and the type will be NULL.
3280 if (this->invariant
) {
3281 assert(this->type
== NULL
);
3283 if (state
->current_function
!= NULL
) {
3284 _mesa_glsl_error(& loc
, state
,
3285 "all uses of `invariant' keyword must be at global "
3289 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3290 assert(decl
->array_specifier
== NULL
);
3291 assert(decl
->initializer
== NULL
);
3293 ir_variable
*const earlier
=
3294 state
->symbols
->get_variable(decl
->identifier
);
3295 if (earlier
== NULL
) {
3296 _mesa_glsl_error(& loc
, state
,
3297 "undeclared variable `%s' cannot be marked "
3298 "invariant", decl
->identifier
);
3299 } else if (!is_varying_var(earlier
, state
->stage
)) {
3300 _mesa_glsl_error(&loc
, state
,
3301 "`%s' cannot be marked invariant; interfaces between "
3302 "shader stages only.", decl
->identifier
);
3303 } else if (earlier
->data
.used
) {
3304 _mesa_glsl_error(& loc
, state
,
3305 "variable `%s' may not be redeclared "
3306 "`invariant' after being used",
3309 earlier
->data
.invariant
= true;
3313 /* Invariant redeclarations do not have r-values.
3318 if (this->precise
) {
3319 assert(this->type
== NULL
);
3321 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3322 assert(decl
->array_specifier
== NULL
);
3323 assert(decl
->initializer
== NULL
);
3325 ir_variable
*const earlier
=
3326 state
->symbols
->get_variable(decl
->identifier
);
3327 if (earlier
== NULL
) {
3328 _mesa_glsl_error(& loc
, state
,
3329 "undeclared variable `%s' cannot be marked "
3330 "precise", decl
->identifier
);
3331 } else if (state
->current_function
!= NULL
&&
3332 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
3333 /* Note: we have to check if we're in a function, since
3334 * builtins are treated as having come from another scope.
3336 _mesa_glsl_error(& loc
, state
,
3337 "variable `%s' from an outer scope may not be "
3338 "redeclared `precise' in this scope",
3340 } else if (earlier
->data
.used
) {
3341 _mesa_glsl_error(& loc
, state
,
3342 "variable `%s' may not be redeclared "
3343 "`precise' after being used",
3346 earlier
->data
.precise
= true;
3350 /* Precise redeclarations do not have r-values either. */
3354 assert(this->type
!= NULL
);
3355 assert(!this->invariant
);
3356 assert(!this->precise
);
3358 /* The type specifier may contain a structure definition. Process that
3359 * before any of the variable declarations.
3361 (void) this->type
->specifier
->hir(instructions
, state
);
3363 decl_type
= this->type
->glsl_type(& type_name
, state
);
3365 /* An offset-qualified atomic counter declaration sets the default
3366 * offset for the next declaration within the same atomic counter
3369 if (decl_type
&& decl_type
->contains_atomic()) {
3370 if (type
->qualifier
.flags
.q
.explicit_binding
&&
3371 type
->qualifier
.flags
.q
.explicit_offset
)
3372 state
->atomic_counter_offsets
[type
->qualifier
.binding
] =
3373 type
->qualifier
.offset
;
3376 if (this->declarations
.is_empty()) {
3377 /* If there is no structure involved in the program text, there are two
3378 * possible scenarios:
3380 * - The program text contained something like 'vec4;'. This is an
3381 * empty declaration. It is valid but weird. Emit a warning.
3383 * - The program text contained something like 'S;' and 'S' is not the
3384 * name of a known structure type. This is both invalid and weird.
3387 * - The program text contained something like 'mediump float;'
3388 * when the programmer probably meant 'precision mediump
3389 * float;' Emit a warning with a description of what they
3390 * probably meant to do.
3392 * Note that if decl_type is NULL and there is a structure involved,
3393 * there must have been some sort of error with the structure. In this
3394 * case we assume that an error was already generated on this line of
3395 * code for the structure. There is no need to generate an additional,
3398 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
3401 if (decl_type
== NULL
) {
3402 _mesa_glsl_error(&loc
, state
,
3403 "invalid type `%s' in empty declaration",
3405 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
3406 /* Empty atomic counter declarations are allowed and useful
3407 * to set the default offset qualifier.
3410 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3411 if (this->type
->specifier
->structure
!= NULL
) {
3412 _mesa_glsl_error(&loc
, state
,
3413 "precision qualifiers can't be applied "
3416 static const char *const precision_names
[] = {
3423 _mesa_glsl_warning(&loc
, state
,
3424 "empty declaration with precision qualifier, "
3425 "to set the default precision, use "
3426 "`precision %s %s;'",
3427 precision_names
[this->type
->qualifier
.precision
],
3430 } else if (this->type
->specifier
->structure
== NULL
) {
3431 _mesa_glsl_warning(&loc
, state
, "empty declaration");
3435 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3436 const struct glsl_type
*var_type
;
3439 /* FINISHME: Emit a warning if a variable declaration shadows a
3440 * FINISHME: declaration at a higher scope.
3443 if ((decl_type
== NULL
) || decl_type
->is_void()) {
3444 if (type_name
!= NULL
) {
3445 _mesa_glsl_error(& loc
, state
,
3446 "invalid type `%s' in declaration of `%s'",
3447 type_name
, decl
->identifier
);
3449 _mesa_glsl_error(& loc
, state
,
3450 "invalid type in declaration of `%s'",
3456 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
3459 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
3461 /* The 'varying in' and 'varying out' qualifiers can only be used with
3462 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
3465 if (this->type
->qualifier
.flags
.q
.varying
) {
3466 if (this->type
->qualifier
.flags
.q
.in
) {
3467 _mesa_glsl_error(& loc
, state
,
3468 "`varying in' qualifier in declaration of "
3469 "`%s' only valid for geometry shaders using "
3470 "ARB_geometry_shader4 or EXT_geometry_shader4",
3472 } else if (this->type
->qualifier
.flags
.q
.out
) {
3473 _mesa_glsl_error(& loc
, state
,
3474 "`varying out' qualifier in declaration of "
3475 "`%s' only valid for geometry shaders using "
3476 "ARB_geometry_shader4 or EXT_geometry_shader4",
3481 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
3483 * "Global variables can only use the qualifiers const,
3484 * attribute, uniform, or varying. Only one may be
3487 * Local variables can only use the qualifier const."
3489 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
3490 * any extension that adds the 'layout' keyword.
3492 if (!state
->is_version(130, 300)
3493 && !state
->has_explicit_attrib_location()
3494 && !state
->has_separate_shader_objects()
3495 && !state
->ARB_fragment_coord_conventions_enable
) {
3496 if (this->type
->qualifier
.flags
.q
.out
) {
3497 _mesa_glsl_error(& loc
, state
,
3498 "`out' qualifier in declaration of `%s' "
3499 "only valid for function parameters in %s",
3500 decl
->identifier
, state
->get_version_string());
3502 if (this->type
->qualifier
.flags
.q
.in
) {
3503 _mesa_glsl_error(& loc
, state
,
3504 "`in' qualifier in declaration of `%s' "
3505 "only valid for function parameters in %s",
3506 decl
->identifier
, state
->get_version_string());
3508 /* FINISHME: Test for other invalid qualifiers. */
3511 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
3514 if (this->type
->qualifier
.flags
.q
.invariant
) {
3515 if (!is_varying_var(var
, state
->stage
)) {
3516 _mesa_glsl_error(&loc
, state
,
3517 "`%s' cannot be marked invariant; interfaces between "
3518 "shader stages only", var
->name
);
3522 if (state
->current_function
!= NULL
) {
3523 const char *mode
= NULL
;
3524 const char *extra
= "";
3526 /* There is no need to check for 'inout' here because the parser will
3527 * only allow that in function parameter lists.
3529 if (this->type
->qualifier
.flags
.q
.attribute
) {
3531 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
3533 } else if (this->type
->qualifier
.flags
.q
.varying
) {
3535 } else if (this->type
->qualifier
.flags
.q
.in
) {
3537 extra
= " or in function parameter list";
3538 } else if (this->type
->qualifier
.flags
.q
.out
) {
3540 extra
= " or in function parameter list";
3544 _mesa_glsl_error(& loc
, state
,
3545 "%s variable `%s' must be declared at "
3547 mode
, var
->name
, extra
);
3549 } else if (var
->data
.mode
== ir_var_shader_in
) {
3550 var
->data
.read_only
= true;
3552 if (state
->stage
== MESA_SHADER_VERTEX
) {
3553 bool error_emitted
= false;
3555 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
3557 * "Vertex shader inputs can only be float, floating-point
3558 * vectors, matrices, signed and unsigned integers and integer
3559 * vectors. Vertex shader inputs can also form arrays of these
3560 * types, but not structures."
3562 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
3564 * "Vertex shader inputs can only be float, floating-point
3565 * vectors, matrices, signed and unsigned integers and integer
3566 * vectors. They cannot be arrays or structures."
3568 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
3570 * "The attribute qualifier can be used only with float,
3571 * floating-point vectors, and matrices. Attribute variables
3572 * cannot be declared as arrays or structures."
3574 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
3576 * "Vertex shader inputs can only be float, floating-point
3577 * vectors, matrices, signed and unsigned integers and integer
3578 * vectors. Vertex shader inputs cannot be arrays or
3581 const glsl_type
*check_type
= var
->type
;
3582 while (check_type
->is_array())
3583 check_type
= check_type
->element_type();
3585 switch (check_type
->base_type
) {
3586 case GLSL_TYPE_FLOAT
:
3588 case GLSL_TYPE_UINT
:
3590 if (state
->is_version(120, 300))
3594 _mesa_glsl_error(& loc
, state
,
3595 "vertex shader input / attribute cannot have "
3597 var
->type
->is_array() ? "array of " : "",
3599 error_emitted
= true;
3602 if (!error_emitted
&& var
->type
->is_array() &&
3603 !state
->check_version(150, 0, &loc
,
3604 "vertex shader input / attribute "
3605 "cannot have array type")) {
3606 error_emitted
= true;
3608 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
3609 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3611 * Geometry shader input variables get the per-vertex values
3612 * written out by vertex shader output variables of the same
3613 * names. Since a geometry shader operates on a set of
3614 * vertices, each input varying variable (or input block, see
3615 * interface blocks below) needs to be declared as an array.
3617 if (!var
->type
->is_array()) {
3618 _mesa_glsl_error(&loc
, state
,
3619 "geometry shader inputs must be arrays");
3622 handle_geometry_shader_input_decl(state
, loc
, var
);
3626 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
3627 * so must integer vertex outputs.
3629 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
3630 * "Fragment shader inputs that are signed or unsigned integers or
3631 * integer vectors must be qualified with the interpolation qualifier
3634 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3635 * "Fragment shader inputs that are, or contain, signed or unsigned
3636 * integers or integer vectors must be qualified with the
3637 * interpolation qualifier flat."
3639 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3640 * "Vertex shader outputs that are, or contain, signed or unsigned
3641 * integers or integer vectors must be qualified with the
3642 * interpolation qualifier flat."
3644 * Note that prior to GLSL 1.50, this requirement applied to vertex
3645 * outputs rather than fragment inputs. That creates problems in the
3646 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3647 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3648 * apply the restriction to both vertex outputs and fragment inputs.
3650 * Note also that the desktop GLSL specs are missing the text "or
3651 * contain"; this is presumably an oversight, since there is no
3652 * reasonable way to interpolate a fragment shader input that contains
3655 if (state
->is_version(130, 300) &&
3656 var
->type
->contains_integer() &&
3657 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
3658 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
3659 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
3660 && state
->es_shader
))) {
3661 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
3662 "vertex output" : "fragment input";
3663 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
3664 "an integer, then it must be qualified with 'flat'",
3668 /* Double fragment inputs must be qualified with 'flat'. */
3669 if (var
->type
->contains_double() &&
3670 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
3671 state
->stage
== MESA_SHADER_FRAGMENT
&&
3672 var
->data
.mode
== ir_var_shader_in
) {
3673 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
3674 "a double, then it must be qualified with 'flat'",
3678 /* Interpolation qualifiers cannot be applied to 'centroid' and
3679 * 'centroid varying'.
3681 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3682 * "interpolation qualifiers may only precede the qualifiers in,
3683 * centroid in, out, or centroid out in a declaration. They do not apply
3684 * to the deprecated storage qualifiers varying or centroid varying."
3686 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3688 if (state
->is_version(130, 0)
3689 && this->type
->qualifier
.has_interpolation()
3690 && this->type
->qualifier
.flags
.q
.varying
) {
3692 const char *i
= this->type
->qualifier
.interpolation_string();
3695 if (this->type
->qualifier
.flags
.q
.centroid
)
3696 s
= "centroid varying";
3700 _mesa_glsl_error(&loc
, state
,
3701 "qualifier '%s' cannot be applied to the "
3702 "deprecated storage qualifier '%s'", i
, s
);
3706 /* Interpolation qualifiers can only apply to vertex shader outputs and
3707 * fragment shader inputs.
3709 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3710 * "Outputs from a vertex shader (out) and inputs to a fragment
3711 * shader (in) can be further qualified with one or more of these
3712 * interpolation qualifiers"
3714 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
3715 * "These interpolation qualifiers may only precede the qualifiers
3716 * in, centroid in, out, or centroid out in a declaration. They do
3717 * not apply to inputs into a vertex shader or outputs from a
3720 if (state
->is_version(130, 300)
3721 && this->type
->qualifier
.has_interpolation()) {
3723 const char *i
= this->type
->qualifier
.interpolation_string();
3726 switch (state
->stage
) {
3727 case MESA_SHADER_VERTEX
:
3728 if (this->type
->qualifier
.flags
.q
.in
) {
3729 _mesa_glsl_error(&loc
, state
,
3730 "qualifier '%s' cannot be applied to vertex "
3731 "shader inputs", i
);
3734 case MESA_SHADER_FRAGMENT
:
3735 if (this->type
->qualifier
.flags
.q
.out
) {
3736 _mesa_glsl_error(&loc
, state
,
3737 "qualifier '%s' cannot be applied to fragment "
3738 "shader outputs", i
);
3747 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
3749 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3750 state
->check_precision_qualifiers_allowed(&loc
);
3754 /* If a precision qualifier is allowed on a type, it is allowed on
3755 * an array of that type.
3757 if (!(this->type
->qualifier
.precision
== ast_precision_none
3758 || precision_qualifier_allowed(var
->type
)
3759 || (var
->type
->is_array()
3760 && precision_qualifier_allowed(var
->type
->fields
.array
)))) {
3762 _mesa_glsl_error(&loc
, state
,
3763 "precision qualifiers apply only to floating point"
3764 ", integer and sampler types");
3767 /* From section 4.1.7 of the GLSL 4.40 spec:
3769 * "[Opaque types] can only be declared as function
3770 * parameters or uniform-qualified variables."
3772 if (var_type
->contains_opaque() &&
3773 !this->type
->qualifier
.flags
.q
.uniform
) {
3774 _mesa_glsl_error(&loc
, state
,
3775 "opaque variables must be declared uniform");
3778 /* Process the initializer and add its instructions to a temporary
3779 * list. This list will be added to the instruction stream (below) after
3780 * the declaration is added. This is done because in some cases (such as
3781 * redeclarations) the declaration may not actually be added to the
3782 * instruction stream.
3784 exec_list initializer_instructions
;
3786 /* Examine var name here since var may get deleted in the next call */
3787 bool var_is_gl_id
= is_gl_identifier(var
->name
);
3789 ir_variable
*earlier
=
3790 get_variable_being_redeclared(var
, decl
->get_location(), state
,
3791 false /* allow_all_redeclarations */);
3792 if (earlier
!= NULL
) {
3794 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
3795 _mesa_glsl_error(&loc
, state
,
3796 "`%s' has already been redeclared using "
3797 "gl_PerVertex", earlier
->name
);
3799 earlier
->data
.how_declared
= ir_var_declared_normally
;
3802 if (decl
->initializer
!= NULL
) {
3803 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3805 &initializer_instructions
, state
);
3808 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3810 * "It is an error to write to a const variable outside of
3811 * its declaration, so they must be initialized when
3814 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3815 _mesa_glsl_error(& loc
, state
,
3816 "const declaration of `%s' must be initialized",
3820 if (state
->es_shader
) {
3821 const glsl_type
*const t
= (earlier
== NULL
)
3822 ? var
->type
: earlier
->type
;
3824 if (t
->is_unsized_array())
3825 /* Section 10.17 of the GLSL ES 1.00 specification states that
3826 * unsized array declarations have been removed from the language.
3827 * Arrays that are sized using an initializer are still explicitly
3828 * sized. However, GLSL ES 1.00 does not allow array
3829 * initializers. That is only allowed in GLSL ES 3.00.
3831 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
3833 * "An array type can also be formed without specifying a size
3834 * if the definition includes an initializer:
3836 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
3837 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
3842 _mesa_glsl_error(& loc
, state
,
3843 "unsized array declarations are not allowed in "
3847 /* If the declaration is not a redeclaration, there are a few additional
3848 * semantic checks that must be applied. In addition, variable that was
3849 * created for the declaration should be added to the IR stream.
3851 if (earlier
== NULL
) {
3852 validate_identifier(decl
->identifier
, loc
, state
);
3854 /* Add the variable to the symbol table. Note that the initializer's
3855 * IR was already processed earlier (though it hasn't been emitted
3856 * yet), without the variable in scope.
3858 * This differs from most C-like languages, but it follows the GLSL
3859 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3862 * "Within a declaration, the scope of a name starts immediately
3863 * after the initializer if present or immediately after the name
3864 * being declared if not."
3866 if (!state
->symbols
->add_variable(var
)) {
3867 YYLTYPE loc
= this->get_location();
3868 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3869 "current scope", decl
->identifier
);
3873 /* Push the variable declaration to the top. It means that all the
3874 * variable declarations will appear in a funny last-to-first order,
3875 * but otherwise we run into trouble if a function is prototyped, a
3876 * global var is decled, then the function is defined with usage of
3877 * the global var. See glslparsertest's CorrectModule.frag.
3879 instructions
->push_head(var
);
3882 instructions
->append_list(&initializer_instructions
);
3886 /* Generally, variable declarations do not have r-values. However,
3887 * one is used for the declaration in
3889 * while (bool b = some_condition()) {
3893 * so we return the rvalue from the last seen declaration here.
3900 ast_parameter_declarator::hir(exec_list
*instructions
,
3901 struct _mesa_glsl_parse_state
*state
)
3904 const struct glsl_type
*type
;
3905 const char *name
= NULL
;
3906 YYLTYPE loc
= this->get_location();
3908 type
= this->type
->glsl_type(& name
, state
);
3912 _mesa_glsl_error(& loc
, state
,
3913 "invalid type `%s' in declaration of `%s'",
3914 name
, this->identifier
);
3916 _mesa_glsl_error(& loc
, state
,
3917 "invalid type in declaration of `%s'",
3921 type
= glsl_type::error_type
;
3924 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3926 * "Functions that accept no input arguments need not use void in the
3927 * argument list because prototypes (or definitions) are required and
3928 * therefore there is no ambiguity when an empty argument list "( )" is
3929 * declared. The idiom "(void)" as a parameter list is provided for
3932 * Placing this check here prevents a void parameter being set up
3933 * for a function, which avoids tripping up checks for main taking
3934 * parameters and lookups of an unnamed symbol.
3936 if (type
->is_void()) {
3937 if (this->identifier
!= NULL
)
3938 _mesa_glsl_error(& loc
, state
,
3939 "named parameter cannot have type `void'");
3945 if (formal_parameter
&& (this->identifier
== NULL
)) {
3946 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3950 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3951 * call already handled the "vec4[..] foo" case.
3953 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
3955 if (!type
->is_error() && type
->is_unsized_array()) {
3956 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3958 type
= glsl_type::error_type
;
3962 ir_variable
*var
= new(ctx
)
3963 ir_variable(type
, this->identifier
, ir_var_function_in
);
3965 /* Apply any specified qualifiers to the parameter declaration. Note that
3966 * for function parameters the default mode is 'in'.
3968 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3971 /* From section 4.1.7 of the GLSL 4.40 spec:
3973 * "Opaque variables cannot be treated as l-values; hence cannot
3974 * be used as out or inout function parameters, nor can they be
3977 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
3978 && type
->contains_opaque()) {
3979 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
3980 "contain opaque variables");
3981 type
= glsl_type::error_type
;
3984 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3986 * "When calling a function, expressions that do not evaluate to
3987 * l-values cannot be passed to parameters declared as out or inout."
3989 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3991 * "Other binary or unary expressions, non-dereferenced arrays,
3992 * function names, swizzles with repeated fields, and constants
3993 * cannot be l-values."
3995 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3996 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3998 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4000 && !state
->check_version(120, 100, &loc
,
4001 "arrays cannot be out or inout parameters")) {
4002 type
= glsl_type::error_type
;
4005 instructions
->push_tail(var
);
4007 /* Parameter declarations do not have r-values.
4014 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
4016 exec_list
*ir_parameters
,
4017 _mesa_glsl_parse_state
*state
)
4019 ast_parameter_declarator
*void_param
= NULL
;
4022 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
4023 param
->formal_parameter
= formal
;
4024 param
->hir(ir_parameters
, state
);
4032 if ((void_param
!= NULL
) && (count
> 1)) {
4033 YYLTYPE loc
= void_param
->get_location();
4035 _mesa_glsl_error(& loc
, state
,
4036 "`void' parameter must be only parameter");
4042 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
4044 /* IR invariants disallow function declarations or definitions
4045 * nested within other function definitions. But there is no
4046 * requirement about the relative order of function declarations
4047 * and definitions with respect to one another. So simply insert
4048 * the new ir_function block at the end of the toplevel instruction
4051 state
->toplevel_ir
->push_tail(f
);
4056 ast_function::hir(exec_list
*instructions
,
4057 struct _mesa_glsl_parse_state
*state
)
4060 ir_function
*f
= NULL
;
4061 ir_function_signature
*sig
= NULL
;
4062 exec_list hir_parameters
;
4064 const char *const name
= identifier
;
4066 /* New functions are always added to the top-level IR instruction stream,
4067 * so this instruction list pointer is ignored. See also emit_function
4070 (void) instructions
;
4072 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
4074 * "Function declarations (prototypes) cannot occur inside of functions;
4075 * they must be at global scope, or for the built-in functions, outside
4076 * the global scope."
4078 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
4080 * "User defined functions may only be defined within the global scope."
4082 * Note that this language does not appear in GLSL 1.10.
4084 if ((state
->current_function
!= NULL
) &&
4085 state
->is_version(120, 100)) {
4086 YYLTYPE loc
= this->get_location();
4087 _mesa_glsl_error(&loc
, state
,
4088 "declaration of function `%s' not allowed within "
4089 "function body", name
);
4092 validate_identifier(name
, this->get_location(), state
);
4094 /* Convert the list of function parameters to HIR now so that they can be
4095 * used below to compare this function's signature with previously seen
4096 * signatures for functions with the same name.
4098 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
4100 & hir_parameters
, state
);
4102 const char *return_type_name
;
4103 const glsl_type
*return_type
=
4104 this->return_type
->glsl_type(& return_type_name
, state
);
4107 YYLTYPE loc
= this->get_location();
4108 _mesa_glsl_error(&loc
, state
,
4109 "function `%s' has undeclared return type `%s'",
4110 name
, return_type_name
);
4111 return_type
= glsl_type::error_type
;
4114 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
4115 * "No qualifier is allowed on the return type of a function."
4117 if (this->return_type
->has_qualifiers()) {
4118 YYLTYPE loc
= this->get_location();
4119 _mesa_glsl_error(& loc
, state
,
4120 "function `%s' return type has qualifiers", name
);
4123 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
4125 * "Arrays are allowed as arguments and as the return type. In both
4126 * cases, the array must be explicitly sized."
4128 if (return_type
->is_unsized_array()) {
4129 YYLTYPE loc
= this->get_location();
4130 _mesa_glsl_error(& loc
, state
,
4131 "function `%s' return type array must be explicitly "
4135 /* From section 4.1.7 of the GLSL 4.40 spec:
4137 * "[Opaque types] can only be declared as function parameters
4138 * or uniform-qualified variables."
4140 if (return_type
->contains_opaque()) {
4141 YYLTYPE loc
= this->get_location();
4142 _mesa_glsl_error(&loc
, state
,
4143 "function `%s' return type can't contain an opaque type",
4147 /* Create an ir_function if one doesn't already exist. */
4148 f
= state
->symbols
->get_function(name
);
4150 f
= new(ctx
) ir_function(name
);
4151 if (!state
->symbols
->add_function(f
)) {
4152 /* This function name shadows a non-function use of the same name. */
4153 YYLTYPE loc
= this->get_location();
4155 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
4156 "non-function", name
);
4160 emit_function(state
, f
);
4163 /* Verify that this function's signature either doesn't match a previously
4164 * seen signature for a function with the same name, or, if a match is found,
4165 * that the previously seen signature does not have an associated definition.
4167 if (state
->es_shader
|| f
->has_user_signature()) {
4168 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
4170 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
4171 if (badvar
!= NULL
) {
4172 YYLTYPE loc
= this->get_location();
4174 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
4175 "qualifiers don't match prototype", name
, badvar
);
4178 if (sig
->return_type
!= return_type
) {
4179 YYLTYPE loc
= this->get_location();
4181 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
4182 "match prototype", name
);
4185 if (sig
->is_defined
) {
4186 if (is_definition
) {
4187 YYLTYPE loc
= this->get_location();
4188 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
4190 /* We just encountered a prototype that exactly matches a
4191 * function that's already been defined. This is redundant,
4192 * and we should ignore it.
4200 /* Verify the return type of main() */
4201 if (strcmp(name
, "main") == 0) {
4202 if (! return_type
->is_void()) {
4203 YYLTYPE loc
= this->get_location();
4205 _mesa_glsl_error(& loc
, state
, "main() must return void");
4208 if (!hir_parameters
.is_empty()) {
4209 YYLTYPE loc
= this->get_location();
4211 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
4215 /* Finish storing the information about this new function in its signature.
4218 sig
= new(ctx
) ir_function_signature(return_type
);
4219 f
->add_signature(sig
);
4222 sig
->replace_parameters(&hir_parameters
);
4225 /* Function declarations (prototypes) do not have r-values.
4232 ast_function_definition::hir(exec_list
*instructions
,
4233 struct _mesa_glsl_parse_state
*state
)
4235 prototype
->is_definition
= true;
4236 prototype
->hir(instructions
, state
);
4238 ir_function_signature
*signature
= prototype
->signature
;
4239 if (signature
== NULL
)
4242 assert(state
->current_function
== NULL
);
4243 state
->current_function
= signature
;
4244 state
->found_return
= false;
4246 /* Duplicate parameters declared in the prototype as concrete variables.
4247 * Add these to the symbol table.
4249 state
->symbols
->push_scope();
4250 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
4251 assert(var
->as_variable() != NULL
);
4253 /* The only way a parameter would "exist" is if two parameters have
4256 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
4257 YYLTYPE loc
= this->get_location();
4259 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
4261 state
->symbols
->add_variable(var
);
4265 /* Convert the body of the function to HIR. */
4266 this->body
->hir(&signature
->body
, state
);
4267 signature
->is_defined
= true;
4269 state
->symbols
->pop_scope();
4271 assert(state
->current_function
== signature
);
4272 state
->current_function
= NULL
;
4274 if (!signature
->return_type
->is_void() && !state
->found_return
) {
4275 YYLTYPE loc
= this->get_location();
4276 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
4277 "%s, but no return statement",
4278 signature
->function_name(),
4279 signature
->return_type
->name
);
4282 /* Function definitions do not have r-values.
4289 ast_jump_statement::hir(exec_list
*instructions
,
4290 struct _mesa_glsl_parse_state
*state
)
4297 assert(state
->current_function
);
4299 if (opt_return_value
) {
4300 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
4302 /* The value of the return type can be NULL if the shader says
4303 * 'return foo();' and foo() is a function that returns void.
4305 * NOTE: The GLSL spec doesn't say that this is an error. The type
4306 * of the return value is void. If the return type of the function is
4307 * also void, then this should compile without error. Seriously.
4309 const glsl_type
*const ret_type
=
4310 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
4312 /* Implicit conversions are not allowed for return values prior to
4313 * ARB_shading_language_420pack.
4315 if (state
->current_function
->return_type
!= ret_type
) {
4316 YYLTYPE loc
= this->get_location();
4318 if (state
->ARB_shading_language_420pack_enable
) {
4319 if (!apply_implicit_conversion(state
->current_function
->return_type
,
4321 _mesa_glsl_error(& loc
, state
,
4322 "could not implicitly convert return value "
4323 "to %s, in function `%s'",
4324 state
->current_function
->return_type
->name
,
4325 state
->current_function
->function_name());
4328 _mesa_glsl_error(& loc
, state
,
4329 "`return' with wrong type %s, in function `%s' "
4332 state
->current_function
->function_name(),
4333 state
->current_function
->return_type
->name
);
4335 } else if (state
->current_function
->return_type
->base_type
==
4337 YYLTYPE loc
= this->get_location();
4339 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
4340 * specs add a clarification:
4342 * "A void function can only use return without a return argument, even if
4343 * the return argument has void type. Return statements only accept values:
4346 * void func2() { return func1(); } // illegal return statement"
4348 _mesa_glsl_error(& loc
, state
,
4349 "void functions can only use `return' without a "
4353 inst
= new(ctx
) ir_return(ret
);
4355 if (state
->current_function
->return_type
->base_type
!=
4357 YYLTYPE loc
= this->get_location();
4359 _mesa_glsl_error(& loc
, state
,
4360 "`return' with no value, in function %s returning "
4362 state
->current_function
->function_name());
4364 inst
= new(ctx
) ir_return
;
4367 state
->found_return
= true;
4368 instructions
->push_tail(inst
);
4373 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
4374 YYLTYPE loc
= this->get_location();
4376 _mesa_glsl_error(& loc
, state
,
4377 "`discard' may only appear in a fragment shader");
4379 instructions
->push_tail(new(ctx
) ir_discard
);
4384 if (mode
== ast_continue
&&
4385 state
->loop_nesting_ast
== NULL
) {
4386 YYLTYPE loc
= this->get_location();
4388 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
4389 } else if (mode
== ast_break
&&
4390 state
->loop_nesting_ast
== NULL
&&
4391 state
->switch_state
.switch_nesting_ast
== NULL
) {
4392 YYLTYPE loc
= this->get_location();
4394 _mesa_glsl_error(& loc
, state
,
4395 "break may only appear in a loop or a switch");
4397 /* For a loop, inline the for loop expression again, since we don't
4398 * know where near the end of the loop body the normal copy of it is
4399 * going to be placed. Same goes for the condition for a do-while
4402 if (state
->loop_nesting_ast
!= NULL
&&
4403 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
4404 if (state
->loop_nesting_ast
->rest_expression
) {
4405 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
4408 if (state
->loop_nesting_ast
->mode
==
4409 ast_iteration_statement::ast_do_while
) {
4410 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
4414 if (state
->switch_state
.is_switch_innermost
&&
4415 mode
== ast_continue
) {
4416 /* Set 'continue_inside' to true. */
4417 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
4418 ir_dereference_variable
*deref_continue_inside_var
=
4419 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
4420 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
4423 /* Break out from the switch, continue for the loop will
4424 * be called right after switch. */
4425 ir_loop_jump
*const jump
=
4426 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4427 instructions
->push_tail(jump
);
4429 } else if (state
->switch_state
.is_switch_innermost
&&
4430 mode
== ast_break
) {
4431 /* Force break out of switch by inserting a break. */
4432 ir_loop_jump
*const jump
=
4433 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4434 instructions
->push_tail(jump
);
4436 ir_loop_jump
*const jump
=
4437 new(ctx
) ir_loop_jump((mode
== ast_break
)
4438 ? ir_loop_jump::jump_break
4439 : ir_loop_jump::jump_continue
);
4440 instructions
->push_tail(jump
);
4447 /* Jump instructions do not have r-values.
4454 ast_selection_statement::hir(exec_list
*instructions
,
4455 struct _mesa_glsl_parse_state
*state
)
4459 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
4461 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
4463 * "Any expression whose type evaluates to a Boolean can be used as the
4464 * conditional expression bool-expression. Vector types are not accepted
4465 * as the expression to if."
4467 * The checks are separated so that higher quality diagnostics can be
4468 * generated for cases where both rules are violated.
4470 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
4471 YYLTYPE loc
= this->condition
->get_location();
4473 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
4477 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
4479 if (then_statement
!= NULL
) {
4480 state
->symbols
->push_scope();
4481 then_statement
->hir(& stmt
->then_instructions
, state
);
4482 state
->symbols
->pop_scope();
4485 if (else_statement
!= NULL
) {
4486 state
->symbols
->push_scope();
4487 else_statement
->hir(& stmt
->else_instructions
, state
);
4488 state
->symbols
->pop_scope();
4491 instructions
->push_tail(stmt
);
4493 /* if-statements do not have r-values.
4500 ast_switch_statement::hir(exec_list
*instructions
,
4501 struct _mesa_glsl_parse_state
*state
)
4505 ir_rvalue
*const test_expression
=
4506 this->test_expression
->hir(instructions
, state
);
4508 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
4510 * "The type of init-expression in a switch statement must be a
4513 if (!test_expression
->type
->is_scalar() ||
4514 !test_expression
->type
->is_integer()) {
4515 YYLTYPE loc
= this->test_expression
->get_location();
4517 _mesa_glsl_error(& loc
,
4519 "switch-statement expression must be scalar "
4523 /* Track the switch-statement nesting in a stack-like manner.
4525 struct glsl_switch_state saved
= state
->switch_state
;
4527 state
->switch_state
.is_switch_innermost
= true;
4528 state
->switch_state
.switch_nesting_ast
= this;
4529 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
4530 hash_table_pointer_compare
);
4531 state
->switch_state
.previous_default
= NULL
;
4533 /* Initalize is_fallthru state to false.
4535 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
4536 state
->switch_state
.is_fallthru_var
=
4537 new(ctx
) ir_variable(glsl_type::bool_type
,
4538 "switch_is_fallthru_tmp",
4540 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
4542 ir_dereference_variable
*deref_is_fallthru_var
=
4543 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4544 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
4547 /* Initialize continue_inside state to false.
4549 state
->switch_state
.continue_inside
=
4550 new(ctx
) ir_variable(glsl_type::bool_type
,
4551 "continue_inside_tmp",
4553 instructions
->push_tail(state
->switch_state
.continue_inside
);
4555 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
4556 ir_dereference_variable
*deref_continue_inside_var
=
4557 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
4558 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
4561 state
->switch_state
.run_default
=
4562 new(ctx
) ir_variable(glsl_type::bool_type
,
4565 instructions
->push_tail(state
->switch_state
.run_default
);
4567 /* Loop around the switch is used for flow control. */
4568 ir_loop
* loop
= new(ctx
) ir_loop();
4569 instructions
->push_tail(loop
);
4571 /* Cache test expression.
4573 test_to_hir(&loop
->body_instructions
, state
);
4575 /* Emit code for body of switch stmt.
4577 body
->hir(&loop
->body_instructions
, state
);
4579 /* Insert a break at the end to exit loop. */
4580 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4581 loop
->body_instructions
.push_tail(jump
);
4583 /* If we are inside loop, check if continue got called inside switch. */
4584 if (state
->loop_nesting_ast
!= NULL
) {
4585 ir_dereference_variable
*deref_continue_inside
=
4586 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
4587 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
4588 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
4590 if (state
->loop_nesting_ast
!= NULL
) {
4591 if (state
->loop_nesting_ast
->rest_expression
) {
4592 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
4595 if (state
->loop_nesting_ast
->mode
==
4596 ast_iteration_statement::ast_do_while
) {
4597 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
4600 irif
->then_instructions
.push_tail(jump
);
4601 instructions
->push_tail(irif
);
4604 hash_table_dtor(state
->switch_state
.labels_ht
);
4606 state
->switch_state
= saved
;
4608 /* Switch statements do not have r-values. */
4614 ast_switch_statement::test_to_hir(exec_list
*instructions
,
4615 struct _mesa_glsl_parse_state
*state
)
4619 /* Cache value of test expression. */
4620 ir_rvalue
*const test_val
=
4621 test_expression
->hir(instructions
,
4624 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
4627 ir_dereference_variable
*deref_test_var
=
4628 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4630 instructions
->push_tail(state
->switch_state
.test_var
);
4631 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
4636 ast_switch_body::hir(exec_list
*instructions
,
4637 struct _mesa_glsl_parse_state
*state
)
4640 stmts
->hir(instructions
, state
);
4642 /* Switch bodies do not have r-values. */
4647 ast_case_statement_list::hir(exec_list
*instructions
,
4648 struct _mesa_glsl_parse_state
*state
)
4650 exec_list default_case
, after_default
, tmp
;
4652 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
4653 case_stmt
->hir(&tmp
, state
);
4656 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
4657 default_case
.append_list(&tmp
);
4661 /* If default case found, append 'after_default' list. */
4662 if (!default_case
.is_empty())
4663 after_default
.append_list(&tmp
);
4665 instructions
->append_list(&tmp
);
4668 /* Handle the default case. This is done here because default might not be
4669 * the last case. We need to add checks against following cases first to see
4670 * if default should be chosen or not.
4672 if (!default_case
.is_empty()) {
4674 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
4675 ir_dereference_variable
*deref_run_default_var
=
4676 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
4678 /* Choose to run default case initially, following conditional
4679 * assignments might change this.
4681 ir_assignment
*const init_var
=
4682 new(state
) ir_assignment(deref_run_default_var
, true_val
);
4683 instructions
->push_tail(init_var
);
4685 /* Default case was the last one, no checks required. */
4686 if (after_default
.is_empty()) {
4687 instructions
->append_list(&default_case
);
4691 foreach_in_list(ir_instruction
, ir
, &after_default
) {
4692 ir_assignment
*assign
= ir
->as_assignment();
4697 /* Clone the check between case label and init expression. */
4698 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
4699 ir_expression
*clone
= exp
->clone(state
, NULL
);
4701 ir_dereference_variable
*deref_var
=
4702 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
4703 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
4705 ir_assignment
*const set_false
=
4706 new(state
) ir_assignment(deref_var
, false_val
, clone
);
4708 instructions
->push_tail(set_false
);
4711 /* Append default case and all cases after it. */
4712 instructions
->append_list(&default_case
);
4713 instructions
->append_list(&after_default
);
4716 /* Case statements do not have r-values. */
4721 ast_case_statement::hir(exec_list
*instructions
,
4722 struct _mesa_glsl_parse_state
*state
)
4724 labels
->hir(instructions
, state
);
4726 /* Guard case statements depending on fallthru state. */
4727 ir_dereference_variable
*const deref_fallthru_guard
=
4728 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4729 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
4731 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
4732 stmt
->hir(& test_fallthru
->then_instructions
, state
);
4734 instructions
->push_tail(test_fallthru
);
4736 /* Case statements do not have r-values. */
4742 ast_case_label_list::hir(exec_list
*instructions
,
4743 struct _mesa_glsl_parse_state
*state
)
4745 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
4746 label
->hir(instructions
, state
);
4748 /* Case labels do not have r-values. */
4753 ast_case_label::hir(exec_list
*instructions
,
4754 struct _mesa_glsl_parse_state
*state
)
4758 ir_dereference_variable
*deref_fallthru_var
=
4759 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4761 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
4763 /* If not default case, ... */
4764 if (this->test_value
!= NULL
) {
4765 /* Conditionally set fallthru state based on
4766 * comparison of cached test expression value to case label.
4768 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
4769 ir_constant
*label_const
= label_rval
->constant_expression_value();
4772 YYLTYPE loc
= this->test_value
->get_location();
4774 _mesa_glsl_error(& loc
, state
,
4775 "switch statement case label must be a "
4776 "constant expression");
4778 /* Stuff a dummy value in to allow processing to continue. */
4779 label_const
= new(ctx
) ir_constant(0);
4781 ast_expression
*previous_label
= (ast_expression
*)
4782 hash_table_find(state
->switch_state
.labels_ht
,
4783 (void *)(uintptr_t)label_const
->value
.u
[0]);
4785 if (previous_label
) {
4786 YYLTYPE loc
= this->test_value
->get_location();
4787 _mesa_glsl_error(& loc
, state
, "duplicate case value");
4789 loc
= previous_label
->get_location();
4790 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
4792 hash_table_insert(state
->switch_state
.labels_ht
,
4794 (void *)(uintptr_t)label_const
->value
.u
[0]);
4798 ir_dereference_variable
*deref_test_var
=
4799 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4801 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4806 * From GLSL 4.40 specification section 6.2 ("Selection"):
4808 * "The type of the init-expression value in a switch statement must
4809 * be a scalar int or uint. The type of the constant-expression value
4810 * in a case label also must be a scalar int or uint. When any pair
4811 * of these values is tested for "equal value" and the types do not
4812 * match, an implicit conversion will be done to convert the int to a
4813 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
4816 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
4817 YYLTYPE loc
= this->test_value
->get_location();
4819 const glsl_type
*type_a
= label_const
->type
;
4820 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
4822 /* Check if int->uint implicit conversion is supported. */
4823 bool integer_conversion_supported
=
4824 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
4827 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
4828 !integer_conversion_supported
) {
4829 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
4830 "init-expression and case label (%s != %s)",
4831 type_a
->name
, type_b
->name
);
4833 /* Conversion of the case label. */
4834 if (type_a
->base_type
== GLSL_TYPE_INT
) {
4835 if (!apply_implicit_conversion(glsl_type::uint_type
,
4836 test_cond
->operands
[0], state
))
4837 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
4839 /* Conversion of the init-expression value. */
4840 if (!apply_implicit_conversion(glsl_type::uint_type
,
4841 test_cond
->operands
[1], state
))
4842 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
4847 ir_assignment
*set_fallthru_on_test
=
4848 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
4850 instructions
->push_tail(set_fallthru_on_test
);
4851 } else { /* default case */
4852 if (state
->switch_state
.previous_default
) {
4853 YYLTYPE loc
= this->get_location();
4854 _mesa_glsl_error(& loc
, state
,
4855 "multiple default labels in one switch");
4857 loc
= state
->switch_state
.previous_default
->get_location();
4858 _mesa_glsl_error(& loc
, state
, "this is the first default label");
4860 state
->switch_state
.previous_default
= this;
4862 /* Set fallthru condition on 'run_default' bool. */
4863 ir_dereference_variable
*deref_run_default
=
4864 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
4865 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
4866 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4870 /* Set falltrhu state. */
4871 ir_assignment
*set_fallthru
=
4872 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
4874 instructions
->push_tail(set_fallthru
);
4877 /* Case statements do not have r-values. */
4882 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
4883 struct _mesa_glsl_parse_state
*state
)
4887 if (condition
!= NULL
) {
4888 ir_rvalue
*const cond
=
4889 condition
->hir(instructions
, state
);
4892 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
4893 YYLTYPE loc
= condition
->get_location();
4895 _mesa_glsl_error(& loc
, state
,
4896 "loop condition must be scalar boolean");
4898 /* As the first code in the loop body, generate a block that looks
4899 * like 'if (!condition) break;' as the loop termination condition.
4901 ir_rvalue
*const not_cond
=
4902 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
4904 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
4906 ir_jump
*const break_stmt
=
4907 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4909 if_stmt
->then_instructions
.push_tail(break_stmt
);
4910 instructions
->push_tail(if_stmt
);
4917 ast_iteration_statement::hir(exec_list
*instructions
,
4918 struct _mesa_glsl_parse_state
*state
)
4922 /* For-loops and while-loops start a new scope, but do-while loops do not.
4924 if (mode
!= ast_do_while
)
4925 state
->symbols
->push_scope();
4927 if (init_statement
!= NULL
)
4928 init_statement
->hir(instructions
, state
);
4930 ir_loop
*const stmt
= new(ctx
) ir_loop();
4931 instructions
->push_tail(stmt
);
4933 /* Track the current loop nesting. */
4934 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
4936 state
->loop_nesting_ast
= this;
4938 /* Likewise, indicate that following code is closest to a loop,
4939 * NOT closest to a switch.
4941 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
4942 state
->switch_state
.is_switch_innermost
= false;
4944 if (mode
!= ast_do_while
)
4945 condition_to_hir(&stmt
->body_instructions
, state
);
4948 body
->hir(& stmt
->body_instructions
, state
);
4950 if (rest_expression
!= NULL
)
4951 rest_expression
->hir(& stmt
->body_instructions
, state
);
4953 if (mode
== ast_do_while
)
4954 condition_to_hir(&stmt
->body_instructions
, state
);
4956 if (mode
!= ast_do_while
)
4957 state
->symbols
->pop_scope();
4959 /* Restore previous nesting before returning. */
4960 state
->loop_nesting_ast
= nesting_ast
;
4961 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
4963 /* Loops do not have r-values.
4970 * Determine if the given type is valid for establishing a default precision
4973 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
4975 * "The precision statement
4977 * precision precision-qualifier type;
4979 * can be used to establish a default precision qualifier. The type field
4980 * can be either int or float or any of the sampler types, and the
4981 * precision-qualifier can be lowp, mediump, or highp."
4983 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4984 * qualifiers on sampler types, but this seems like an oversight (since the
4985 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4986 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4990 is_valid_default_precision_type(const struct glsl_type
*const type
)
4995 switch (type
->base_type
) {
4997 case GLSL_TYPE_FLOAT
:
4998 /* "int" and "float" are valid, but vectors and matrices are not. */
4999 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
5000 case GLSL_TYPE_SAMPLER
:
5009 ast_type_specifier::hir(exec_list
*instructions
,
5010 struct _mesa_glsl_parse_state
*state
)
5012 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
5015 YYLTYPE loc
= this->get_location();
5017 /* If this is a precision statement, check that the type to which it is
5018 * applied is either float or int.
5020 * From section 4.5.3 of the GLSL 1.30 spec:
5021 * "The precision statement
5022 * precision precision-qualifier type;
5023 * can be used to establish a default precision qualifier. The type
5024 * field can be either int or float [...]. Any other types or
5025 * qualifiers will result in an error.
5027 if (this->default_precision
!= ast_precision_none
) {
5028 if (!state
->check_precision_qualifiers_allowed(&loc
))
5031 if (this->structure
!= NULL
) {
5032 _mesa_glsl_error(&loc
, state
,
5033 "precision qualifiers do not apply to structures");
5037 if (this->array_specifier
!= NULL
) {
5038 _mesa_glsl_error(&loc
, state
,
5039 "default precision statements do not apply to "
5044 const struct glsl_type
*const type
=
5045 state
->symbols
->get_type(this->type_name
);
5046 if (!is_valid_default_precision_type(type
)) {
5047 _mesa_glsl_error(&loc
, state
,
5048 "default precision statements apply only to "
5049 "float, int, and sampler types");
5053 if (type
->base_type
== GLSL_TYPE_FLOAT
5055 && state
->stage
== MESA_SHADER_FRAGMENT
) {
5056 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
5059 * "The fragment language has no default precision qualifier for
5060 * floating point types."
5062 * As a result, we have to track whether or not default precision has
5063 * been specified for float in GLSL ES fragment shaders.
5065 * Earlier in that same section, the spec says:
5067 * "Non-precision qualified declarations will use the precision
5068 * qualifier specified in the most recent precision statement
5069 * that is still in scope. The precision statement has the same
5070 * scoping rules as variable declarations. If it is declared
5071 * inside a compound statement, its effect stops at the end of
5072 * the innermost statement it was declared in. Precision
5073 * statements in nested scopes override precision statements in
5074 * outer scopes. Multiple precision statements for the same basic
5075 * type can appear inside the same scope, with later statements
5076 * overriding earlier statements within that scope."
5078 * Default precision specifications follow the same scope rules as
5079 * variables. So, we can track the state of the default float
5080 * precision in the symbol table, and the rules will just work. This
5081 * is a slight abuse of the symbol table, but it has the semantics
5084 ir_variable
*const junk
=
5085 new(state
) ir_variable(type
, "#default precision",
5088 state
->symbols
->add_variable(junk
);
5091 /* FINISHME: Translate precision statements into IR. */
5095 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
5096 * process_record_constructor() can do type-checking on C-style initializer
5097 * expressions of structs, but ast_struct_specifier should only be translated
5098 * to HIR if it is declaring the type of a structure.
5100 * The ->is_declaration field is false for initializers of variables
5101 * declared separately from the struct's type definition.
5103 * struct S { ... }; (is_declaration = true)
5104 * struct T { ... } t = { ... }; (is_declaration = true)
5105 * S s = { ... }; (is_declaration = false)
5107 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
5108 return this->structure
->hir(instructions
, state
);
5115 * Process a structure or interface block tree into an array of structure fields
5117 * After parsing, where there are some syntax differnces, structures and
5118 * interface blocks are almost identical. They are similar enough that the
5119 * AST for each can be processed the same way into a set of
5120 * \c glsl_struct_field to describe the members.
5122 * If we're processing an interface block, var_mode should be the type of the
5123 * interface block (ir_var_shader_in, ir_var_shader_out, or ir_var_uniform).
5124 * If we're processing a structure, var_mode should be ir_var_auto.
5127 * The number of fields processed. A pointer to the array structure fields is
5128 * stored in \c *fields_ret.
5131 ast_process_structure_or_interface_block(exec_list
*instructions
,
5132 struct _mesa_glsl_parse_state
*state
,
5133 exec_list
*declarations
,
5135 glsl_struct_field
**fields_ret
,
5137 enum glsl_matrix_layout matrix_layout
,
5138 bool allow_reserved_names
,
5139 ir_variable_mode var_mode
)
5141 unsigned decl_count
= 0;
5143 /* Make an initial pass over the list of fields to determine how
5144 * many there are. Each element in this list is an ast_declarator_list.
5145 * This means that we actually need to count the number of elements in the
5146 * 'declarations' list in each of the elements.
5148 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
5149 decl_count
+= decl_list
->declarations
.length();
5152 /* Allocate storage for the fields and process the field
5153 * declarations. As the declarations are processed, try to also convert
5154 * the types to HIR. This ensures that structure definitions embedded in
5155 * other structure definitions or in interface blocks are processed.
5157 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
5161 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
5162 const char *type_name
;
5164 decl_list
->type
->specifier
->hir(instructions
, state
);
5166 /* Section 10.9 of the GLSL ES 1.00 specification states that
5167 * embedded structure definitions have been removed from the language.
5169 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
5170 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
5171 "not allowed in GLSL ES 1.00");
5174 const glsl_type
*decl_type
=
5175 decl_list
->type
->glsl_type(& type_name
, state
);
5177 foreach_list_typed (ast_declaration
, decl
, link
,
5178 &decl_list
->declarations
) {
5179 if (!allow_reserved_names
)
5180 validate_identifier(decl
->identifier
, loc
, state
);
5182 /* From section 4.3.9 of the GLSL 4.40 spec:
5184 * "[In interface blocks] opaque types are not allowed."
5186 * It should be impossible for decl_type to be NULL here. Cases that
5187 * might naturally lead to decl_type being NULL, especially for the
5188 * is_interface case, will have resulted in compilation having
5189 * already halted due to a syntax error.
5191 const struct glsl_type
*field_type
=
5192 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
5194 if (is_interface
&& field_type
->contains_opaque()) {
5195 YYLTYPE loc
= decl_list
->get_location();
5196 _mesa_glsl_error(&loc
, state
,
5197 "uniform in non-default uniform block contains "
5201 if (field_type
->contains_atomic()) {
5202 /* FINISHME: Add a spec quotation here once updated spec
5203 * FINISHME: language is available. See Khronos bug #10903
5204 * FINISHME: on whether atomic counters are allowed in
5205 * FINISHME: structures.
5207 YYLTYPE loc
= decl_list
->get_location();
5208 _mesa_glsl_error(&loc
, state
, "atomic counter in structure or "
5212 if (field_type
->contains_image()) {
5213 /* FINISHME: Same problem as with atomic counters.
5214 * FINISHME: Request clarification from Khronos and add
5215 * FINISHME: spec quotation here.
5217 YYLTYPE loc
= decl_list
->get_location();
5218 _mesa_glsl_error(&loc
, state
,
5219 "image in structure or uniform block");
5222 const struct ast_type_qualifier
*const qual
=
5223 & decl_list
->type
->qualifier
;
5224 if (qual
->flags
.q
.std140
||
5225 qual
->flags
.q
.packed
||
5226 qual
->flags
.q
.shared
) {
5227 _mesa_glsl_error(&loc
, state
,
5228 "uniform block layout qualifiers std140, packed, and "
5229 "shared can only be applied to uniform blocks, not "
5233 if (qual
->flags
.q
.constant
) {
5234 YYLTYPE loc
= decl_list
->get_location();
5235 _mesa_glsl_error(&loc
, state
,
5236 "const storage qualifier cannot be applied "
5237 "to struct or interface block members");
5240 field_type
= process_array_type(&loc
, decl_type
,
5241 decl
->array_specifier
, state
);
5242 fields
[i
].type
= field_type
;
5243 fields
[i
].name
= decl
->identifier
;
5244 fields
[i
].location
= -1;
5245 fields
[i
].interpolation
=
5246 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
5247 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
5248 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
5250 /* Only save explicitly defined streams in block's field */
5251 fields
[i
].stream
= qual
->flags
.q
.explicit_stream
? qual
->stream
: -1;
5253 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
5254 if (!qual
->flags
.q
.uniform
) {
5255 _mesa_glsl_error(&loc
, state
,
5256 "row_major and column_major can only be "
5257 "applied to uniform interface blocks");
5259 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
5262 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
5263 _mesa_glsl_error(&loc
, state
,
5264 "interpolation qualifiers cannot be used "
5265 "with uniform interface blocks");
5268 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
5269 qual
->has_auxiliary_storage()) {
5270 _mesa_glsl_error(&loc
, state
,
5271 "auxiliary storage qualifiers cannot be used "
5272 "in uniform blocks or structures.");
5275 /* Propogate row- / column-major information down the fields of the
5276 * structure or interface block. Structures need this data because
5277 * the structure may contain a structure that contains ... a matrix
5278 * that need the proper layout.
5280 if (field_type
->without_array()->is_matrix()
5281 || field_type
->without_array()->is_record()) {
5282 /* If no layout is specified for the field, inherit the layout
5285 fields
[i
].matrix_layout
= matrix_layout
;
5287 if (qual
->flags
.q
.row_major
)
5288 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
5289 else if (qual
->flags
.q
.column_major
)
5290 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
5292 /* If we're processing an interface block, the matrix layout must
5293 * be decided by this point.
5295 assert(!is_interface
5296 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
5297 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
5304 assert(i
== decl_count
);
5306 *fields_ret
= fields
;
5312 ast_struct_specifier::hir(exec_list
*instructions
,
5313 struct _mesa_glsl_parse_state
*state
)
5315 YYLTYPE loc
= this->get_location();
5317 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
5319 * "Anonymous structures are not supported; so embedded structures must
5320 * have a declarator. A name given to an embedded struct is scoped at
5321 * the same level as the struct it is embedded in."
5323 * The same section of the GLSL 1.20 spec says:
5325 * "Anonymous structures are not supported. Embedded structures are not
5328 * struct S { float f; };
5330 * S; // Error: anonymous structures disallowed
5331 * struct { ... }; // Error: embedded structures disallowed
5332 * S s; // Okay: nested structures with name are allowed
5335 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
5336 * we allow embedded structures in 1.10 only.
5338 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
5339 _mesa_glsl_error(&loc
, state
,
5340 "embedded structure declarations are not allowed");
5342 state
->struct_specifier_depth
++;
5344 glsl_struct_field
*fields
;
5345 unsigned decl_count
=
5346 ast_process_structure_or_interface_block(instructions
,
5348 &this->declarations
,
5352 GLSL_MATRIX_LAYOUT_INHERITED
,
5353 false /* allow_reserved_names */,
5356 validate_identifier(this->name
, loc
, state
);
5358 const glsl_type
*t
=
5359 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
5361 if (!state
->symbols
->add_type(name
, t
)) {
5362 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
5364 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
5366 state
->num_user_structures
+ 1);
5368 s
[state
->num_user_structures
] = t
;
5369 state
->user_structures
= s
;
5370 state
->num_user_structures
++;
5374 state
->struct_specifier_depth
--;
5376 /* Structure type definitions do not have r-values.
5383 * Visitor class which detects whether a given interface block has been used.
5385 class interface_block_usage_visitor
: public ir_hierarchical_visitor
5388 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
5389 : mode(mode
), block(block
), found(false)
5393 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
5395 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
5399 return visit_continue
;
5402 bool usage_found() const
5408 ir_variable_mode mode
;
5409 const glsl_type
*block
;
5415 ast_interface_block::hir(exec_list
*instructions
,
5416 struct _mesa_glsl_parse_state
*state
)
5418 YYLTYPE loc
= this->get_location();
5420 /* Interface blocks must be declared at global scope */
5421 if (state
->current_function
!= NULL
) {
5422 _mesa_glsl_error(&loc
, state
,
5423 "Interface block `%s' must be declared "
5428 /* The ast_interface_block has a list of ast_declarator_lists. We
5429 * need to turn those into ir_variables with an association
5430 * with this uniform block.
5432 enum glsl_interface_packing packing
;
5433 if (this->layout
.flags
.q
.shared
) {
5434 packing
= GLSL_INTERFACE_PACKING_SHARED
;
5435 } else if (this->layout
.flags
.q
.packed
) {
5436 packing
= GLSL_INTERFACE_PACKING_PACKED
;
5438 /* The default layout is std140.
5440 packing
= GLSL_INTERFACE_PACKING_STD140
;
5443 ir_variable_mode var_mode
;
5444 const char *iface_type_name
;
5445 if (this->layout
.flags
.q
.in
) {
5446 var_mode
= ir_var_shader_in
;
5447 iface_type_name
= "in";
5448 } else if (this->layout
.flags
.q
.out
) {
5449 var_mode
= ir_var_shader_out
;
5450 iface_type_name
= "out";
5451 } else if (this->layout
.flags
.q
.uniform
) {
5452 var_mode
= ir_var_uniform
;
5453 iface_type_name
= "uniform";
5455 var_mode
= ir_var_auto
;
5456 iface_type_name
= "UNKNOWN";
5457 assert(!"interface block layout qualifier not found!");
5460 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
5461 if (this->layout
.flags
.q
.row_major
)
5462 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
5463 else if (this->layout
.flags
.q
.column_major
)
5464 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
5466 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
5467 exec_list declared_variables
;
5468 glsl_struct_field
*fields
;
5470 /* Treat an interface block as one level of nesting, so that embedded struct
5471 * specifiers will be disallowed.
5473 state
->struct_specifier_depth
++;
5475 unsigned int num_variables
=
5476 ast_process_structure_or_interface_block(&declared_variables
,
5478 &this->declarations
,
5483 redeclaring_per_vertex
,
5486 state
->struct_specifier_depth
--;
5488 if (!redeclaring_per_vertex
) {
5489 validate_identifier(this->block_name
, loc
, state
);
5491 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
5493 * "Block names have no other use within a shader beyond interface
5494 * matching; it is a compile-time error to use a block name at global
5495 * scope for anything other than as a block name."
5497 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
5498 if (var
&& !var
->type
->is_interface()) {
5499 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
5500 "already used in the scope.",
5505 const glsl_type
*earlier_per_vertex
= NULL
;
5506 if (redeclaring_per_vertex
) {
5507 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
5508 * the named interface block gl_in, we can find it by looking at the
5509 * previous declaration of gl_in. Otherwise we can find it by looking
5510 * at the previous decalartion of any of the built-in outputs,
5513 * Also check that the instance name and array-ness of the redeclaration
5517 case ir_var_shader_in
:
5518 if (ir_variable
*earlier_gl_in
=
5519 state
->symbols
->get_variable("gl_in")) {
5520 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
5522 _mesa_glsl_error(&loc
, state
,
5523 "redeclaration of gl_PerVertex input not allowed "
5525 _mesa_shader_stage_to_string(state
->stage
));
5527 if (this->instance_name
== NULL
||
5528 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
) {
5529 _mesa_glsl_error(&loc
, state
,
5530 "gl_PerVertex input must be redeclared as "
5534 case ir_var_shader_out
:
5535 if (ir_variable
*earlier_gl_Position
=
5536 state
->symbols
->get_variable("gl_Position")) {
5537 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
5539 _mesa_glsl_error(&loc
, state
,
5540 "redeclaration of gl_PerVertex output not "
5541 "allowed in the %s shader",
5542 _mesa_shader_stage_to_string(state
->stage
));
5544 if (this->instance_name
!= NULL
) {
5545 _mesa_glsl_error(&loc
, state
,
5546 "gl_PerVertex output may not be redeclared with "
5547 "an instance name");
5551 _mesa_glsl_error(&loc
, state
,
5552 "gl_PerVertex must be declared as an input or an "
5557 if (earlier_per_vertex
== NULL
) {
5558 /* An error has already been reported. Bail out to avoid null
5559 * dereferences later in this function.
5564 /* Copy locations from the old gl_PerVertex interface block. */
5565 for (unsigned i
= 0; i
< num_variables
; i
++) {
5566 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
5568 _mesa_glsl_error(&loc
, state
,
5569 "redeclaration of gl_PerVertex must be a subset "
5570 "of the built-in members of gl_PerVertex");
5572 fields
[i
].location
=
5573 earlier_per_vertex
->fields
.structure
[j
].location
;
5574 fields
[i
].interpolation
=
5575 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
5576 fields
[i
].centroid
=
5577 earlier_per_vertex
->fields
.structure
[j
].centroid
;
5579 earlier_per_vertex
->fields
.structure
[j
].sample
;
5583 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
5586 * If a built-in interface block is redeclared, it must appear in
5587 * the shader before any use of any member included in the built-in
5588 * declaration, or a compilation error will result.
5590 * This appears to be a clarification to the behaviour established for
5591 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
5592 * regardless of GLSL version.
5594 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
5595 v
.run(instructions
);
5596 if (v
.usage_found()) {
5597 _mesa_glsl_error(&loc
, state
,
5598 "redeclaration of a built-in interface block must "
5599 "appear before any use of any member of the "
5604 const glsl_type
*block_type
=
5605 glsl_type::get_interface_instance(fields
,
5610 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
5611 YYLTYPE loc
= this->get_location();
5612 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
5613 "already taken in the current scope",
5614 this->block_name
, iface_type_name
);
5617 /* Since interface blocks cannot contain statements, it should be
5618 * impossible for the block to generate any instructions.
5620 assert(declared_variables
.is_empty());
5622 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5624 * Geometry shader input variables get the per-vertex values written
5625 * out by vertex shader output variables of the same names. Since a
5626 * geometry shader operates on a set of vertices, each input varying
5627 * variable (or input block, see interface blocks below) needs to be
5628 * declared as an array.
5630 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
5631 var_mode
== ir_var_shader_in
) {
5632 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
5635 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
5638 * "If an instance name (instance-name) is used, then it puts all the
5639 * members inside a scope within its own name space, accessed with the
5640 * field selector ( . ) operator (analogously to structures)."
5642 if (this->instance_name
) {
5643 if (redeclaring_per_vertex
) {
5644 /* When a built-in in an unnamed interface block is redeclared,
5645 * get_variable_being_redeclared() calls
5646 * check_builtin_array_max_size() to make sure that built-in array
5647 * variables aren't redeclared to illegal sizes. But we're looking
5648 * at a redeclaration of a named built-in interface block. So we
5649 * have to manually call check_builtin_array_max_size() for all parts
5650 * of the interface that are arrays.
5652 for (unsigned i
= 0; i
< num_variables
; i
++) {
5653 if (fields
[i
].type
->is_array()) {
5654 const unsigned size
= fields
[i
].type
->array_size();
5655 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
5659 validate_identifier(this->instance_name
, loc
, state
);
5664 if (this->array_specifier
!= NULL
) {
5665 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
5667 * For uniform blocks declared an array, each individual array
5668 * element corresponds to a separate buffer object backing one
5669 * instance of the block. As the array size indicates the number
5670 * of buffer objects needed, uniform block array declarations
5671 * must specify an array size.
5673 * And a few paragraphs later:
5675 * Geometry shader input blocks must be declared as arrays and
5676 * follow the array declaration and linking rules for all
5677 * geometry shader inputs. All other input and output block
5678 * arrays must specify an array size.
5680 * The upshot of this is that the only circumstance where an
5681 * interface array size *doesn't* need to be specified is on a
5682 * geometry shader input.
5684 if (this->array_specifier
->is_unsized_array
&&
5685 (state
->stage
!= MESA_SHADER_GEOMETRY
|| !this->layout
.flags
.q
.in
)) {
5686 _mesa_glsl_error(&loc
, state
,
5687 "only geometry shader inputs may be unsized "
5688 "instance block arrays");
5692 const glsl_type
*block_array_type
=
5693 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
5695 var
= new(state
) ir_variable(block_array_type
,
5696 this->instance_name
,
5699 var
= new(state
) ir_variable(block_type
,
5700 this->instance_name
,
5704 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
5705 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
5707 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
5708 handle_geometry_shader_input_decl(state
, loc
, var
);
5710 if (ir_variable
*earlier
=
5711 state
->symbols
->get_variable(this->instance_name
)) {
5712 if (!redeclaring_per_vertex
) {
5713 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
5714 this->instance_name
);
5716 earlier
->data
.how_declared
= ir_var_declared_normally
;
5717 earlier
->type
= var
->type
;
5718 earlier
->reinit_interface_type(block_type
);
5721 /* Propagate the "binding" keyword into this UBO's fields;
5722 * the UBO declaration itself doesn't get an ir_variable unless it
5723 * has an instance name. This is ugly.
5725 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
5726 var
->data
.binding
= this->layout
.binding
;
5728 state
->symbols
->add_variable(var
);
5729 instructions
->push_tail(var
);
5732 /* In order to have an array size, the block must also be declared with
5735 assert(this->array_specifier
== NULL
);
5737 for (unsigned i
= 0; i
< num_variables
; i
++) {
5739 new(state
) ir_variable(fields
[i
].type
,
5740 ralloc_strdup(state
, fields
[i
].name
),
5742 var
->data
.interpolation
= fields
[i
].interpolation
;
5743 var
->data
.centroid
= fields
[i
].centroid
;
5744 var
->data
.sample
= fields
[i
].sample
;
5745 var
->init_interface_type(block_type
);
5747 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
5748 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
5749 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
5751 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
5754 if (fields
[i
].stream
!= -1 &&
5755 ((unsigned)fields
[i
].stream
) != this->layout
.stream
) {
5756 _mesa_glsl_error(&loc
, state
,
5757 "stream layout qualifier on "
5758 "interface block member `%s' does not match "
5759 "the interface block (%d vs %d)",
5760 var
->name
, fields
[i
].stream
, this->layout
.stream
);
5763 var
->data
.stream
= this->layout
.stream
;
5765 /* Examine var name here since var may get deleted in the next call */
5766 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5768 if (redeclaring_per_vertex
) {
5769 ir_variable
*earlier
=
5770 get_variable_being_redeclared(var
, loc
, state
,
5771 true /* allow_all_redeclarations */);
5772 if (!var_is_gl_id
|| earlier
== NULL
) {
5773 _mesa_glsl_error(&loc
, state
,
5774 "redeclaration of gl_PerVertex can only "
5775 "include built-in variables");
5776 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
5777 _mesa_glsl_error(&loc
, state
,
5778 "`%s' has already been redeclared",
5781 earlier
->data
.how_declared
= ir_var_declared_in_block
;
5782 earlier
->reinit_interface_type(block_type
);
5787 if (state
->symbols
->get_variable(var
->name
) != NULL
)
5788 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
5790 /* Propagate the "binding" keyword into this UBO's fields;
5791 * the UBO declaration itself doesn't get an ir_variable unless it
5792 * has an instance name. This is ugly.
5794 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
5795 var
->data
.binding
= this->layout
.binding
;
5797 state
->symbols
->add_variable(var
);
5798 instructions
->push_tail(var
);
5801 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
5802 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
5804 * It is also a compilation error ... to redeclare a built-in
5805 * block and then use a member from that built-in block that was
5806 * not included in the redeclaration.
5808 * This appears to be a clarification to the behaviour established
5809 * for gl_PerVertex by GLSL 1.50, therefore we implement this
5810 * behaviour regardless of GLSL version.
5812 * To prevent the shader from using a member that was not included in
5813 * the redeclaration, we disable any ir_variables that are still
5814 * associated with the old declaration of gl_PerVertex (since we've
5815 * already updated all of the variables contained in the new
5816 * gl_PerVertex to point to it).
5818 * As a side effect this will prevent
5819 * validate_intrastage_interface_blocks() from getting confused and
5820 * thinking there are conflicting definitions of gl_PerVertex in the
5823 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
5824 ir_variable
*const var
= node
->as_variable();
5826 var
->get_interface_type() == earlier_per_vertex
&&
5827 var
->data
.mode
== var_mode
) {
5828 if (var
->data
.how_declared
== ir_var_declared_normally
) {
5829 _mesa_glsl_error(&loc
, state
,
5830 "redeclaration of gl_PerVertex cannot "
5831 "follow a redeclaration of `%s'",
5834 state
->symbols
->disable_variable(var
->name
);
5846 ast_gs_input_layout::hir(exec_list
*instructions
,
5847 struct _mesa_glsl_parse_state
*state
)
5849 YYLTYPE loc
= this->get_location();
5851 /* If any geometry input layout declaration preceded this one, make sure it
5852 * was consistent with this one.
5854 if (state
->gs_input_prim_type_specified
&&
5855 state
->in_qualifier
->prim_type
!= this->prim_type
) {
5856 _mesa_glsl_error(&loc
, state
,
5857 "geometry shader input layout does not match"
5858 " previous declaration");
5862 /* If any shader inputs occurred before this declaration and specified an
5863 * array size, make sure the size they specified is consistent with the
5866 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
5867 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
5868 _mesa_glsl_error(&loc
, state
,
5869 "this geometry shader input layout implies %u vertices"
5870 " per primitive, but a previous input is declared"
5871 " with size %u", num_vertices
, state
->gs_input_size
);
5875 state
->gs_input_prim_type_specified
= true;
5877 /* If any shader inputs occurred before this declaration and did not
5878 * specify an array size, their size is determined now.
5880 foreach_in_list(ir_instruction
, node
, instructions
) {
5881 ir_variable
*var
= node
->as_variable();
5882 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
5885 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
5889 if (var
->type
->is_unsized_array()) {
5890 if (var
->data
.max_array_access
>= num_vertices
) {
5891 _mesa_glsl_error(&loc
, state
,
5892 "this geometry shader input layout implies %u"
5893 " vertices, but an access to element %u of input"
5894 " `%s' already exists", num_vertices
,
5895 var
->data
.max_array_access
, var
->name
);
5897 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
5908 ast_cs_input_layout::hir(exec_list
*instructions
,
5909 struct _mesa_glsl_parse_state
*state
)
5911 YYLTYPE loc
= this->get_location();
5913 /* If any compute input layout declaration preceded this one, make sure it
5914 * was consistent with this one.
5916 if (state
->cs_input_local_size_specified
) {
5917 for (int i
= 0; i
< 3; i
++) {
5918 if (state
->cs_input_local_size
[i
] != this->local_size
[i
]) {
5919 _mesa_glsl_error(&loc
, state
,
5920 "compute shader input layout does not match"
5921 " previous declaration");
5927 /* From the ARB_compute_shader specification:
5929 * If the local size of the shader in any dimension is greater
5930 * than the maximum size supported by the implementation for that
5931 * dimension, a compile-time error results.
5933 * It is not clear from the spec how the error should be reported if
5934 * the total size of the work group exceeds
5935 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
5936 * report it at compile time as well.
5938 GLuint64 total_invocations
= 1;
5939 for (int i
= 0; i
< 3; i
++) {
5940 if (this->local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
5941 _mesa_glsl_error(&loc
, state
,
5942 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
5944 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
5947 total_invocations
*= this->local_size
[i
];
5948 if (total_invocations
>
5949 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
5950 _mesa_glsl_error(&loc
, state
,
5951 "product of local_sizes exceeds "
5952 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
5953 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
5958 state
->cs_input_local_size_specified
= true;
5959 for (int i
= 0; i
< 3; i
++)
5960 state
->cs_input_local_size
[i
] = this->local_size
[i
];
5962 /* We may now declare the built-in constant gl_WorkGroupSize (see
5963 * builtin_variable_generator::generate_constants() for why we didn't
5964 * declare it earlier).
5966 ir_variable
*var
= new(state
->symbols
)
5967 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
5968 var
->data
.how_declared
= ir_var_declared_implicitly
;
5969 var
->data
.read_only
= true;
5970 instructions
->push_tail(var
);
5971 state
->symbols
->add_variable(var
);
5972 ir_constant_data data
;
5973 memset(&data
, 0, sizeof(data
));
5974 for (int i
= 0; i
< 3; i
++)
5975 data
.u
[i
] = this->local_size
[i
];
5976 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
5977 var
->constant_initializer
=
5978 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
5979 var
->data
.has_initializer
= true;
5986 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
5987 exec_list
*instructions
)
5989 bool gl_FragColor_assigned
= false;
5990 bool gl_FragData_assigned
= false;
5991 bool user_defined_fs_output_assigned
= false;
5992 ir_variable
*user_defined_fs_output
= NULL
;
5994 /* It would be nice to have proper location information. */
5996 memset(&loc
, 0, sizeof(loc
));
5998 foreach_in_list(ir_instruction
, node
, instructions
) {
5999 ir_variable
*var
= node
->as_variable();
6001 if (!var
|| !var
->data
.assigned
)
6004 if (strcmp(var
->name
, "gl_FragColor") == 0)
6005 gl_FragColor_assigned
= true;
6006 else if (strcmp(var
->name
, "gl_FragData") == 0)
6007 gl_FragData_assigned
= true;
6008 else if (!is_gl_identifier(var
->name
)) {
6009 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
6010 var
->data
.mode
== ir_var_shader_out
) {
6011 user_defined_fs_output_assigned
= true;
6012 user_defined_fs_output
= var
;
6017 /* From the GLSL 1.30 spec:
6019 * "If a shader statically assigns a value to gl_FragColor, it
6020 * may not assign a value to any element of gl_FragData. If a
6021 * shader statically writes a value to any element of
6022 * gl_FragData, it may not assign a value to
6023 * gl_FragColor. That is, a shader may assign values to either
6024 * gl_FragColor or gl_FragData, but not both. Multiple shaders
6025 * linked together must also consistently write just one of
6026 * these variables. Similarly, if user declared output
6027 * variables are in use (statically assigned to), then the
6028 * built-in variables gl_FragColor and gl_FragData may not be
6029 * assigned to. These incorrect usages all generate compile
6032 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
6033 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6034 "`gl_FragColor' and `gl_FragData'");
6035 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
6036 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6037 "`gl_FragColor' and `%s'",
6038 user_defined_fs_output
->name
);
6039 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
6040 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6041 "`gl_FragData' and `%s'",
6042 user_defined_fs_output
->name
);
6048 remove_per_vertex_blocks(exec_list
*instructions
,
6049 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
6051 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
6052 * if it exists in this shader type.
6054 const glsl_type
*per_vertex
= NULL
;
6056 case ir_var_shader_in
:
6057 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
6058 per_vertex
= gl_in
->get_interface_type();
6060 case ir_var_shader_out
:
6061 if (ir_variable
*gl_Position
=
6062 state
->symbols
->get_variable("gl_Position")) {
6063 per_vertex
= gl_Position
->get_interface_type();
6067 assert(!"Unexpected mode");
6071 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
6072 * need to do anything.
6074 if (per_vertex
== NULL
)
6077 /* If the interface block is used by the shader, then we don't need to do
6080 interface_block_usage_visitor
v(mode
, per_vertex
);
6081 v
.run(instructions
);
6082 if (v
.usage_found())
6085 /* Remove any ir_variable declarations that refer to the interface block
6088 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
6089 ir_variable
*const var
= node
->as_variable();
6090 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
6091 var
->data
.mode
== mode
) {
6092 state
->symbols
->disable_variable(var
->name
);