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 "main/core.h" /* for struct gl_extensions */
53 #include "glsl_symbol_table.h"
54 #include "glsl_parser_extras.h"
56 #include "glsl_types.h"
57 #include "program/hash_table.h"
61 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
62 exec_list
*instructions
);
64 remove_per_vertex_blocks(exec_list
*instructions
,
65 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
69 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
71 _mesa_glsl_initialize_variables(instructions
, state
);
73 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
75 state
->current_function
= NULL
;
77 state
->toplevel_ir
= instructions
;
79 state
->gs_input_prim_type_specified
= false;
81 /* Section 4.2 of the GLSL 1.20 specification states:
82 * "The built-in functions are scoped in a scope outside the global scope
83 * users declare global variables in. That is, a shader's global scope,
84 * available for user-defined functions and global variables, is nested
85 * inside the scope containing the built-in functions."
87 * Since built-in functions like ftransform() access built-in variables,
88 * it follows that those must be in the outer scope as well.
90 * We push scope here to create this nesting effect...but don't pop.
91 * This way, a shader's globals are still in the symbol table for use
94 state
->symbols
->push_scope();
96 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
97 ast
->hir(instructions
, state
);
99 detect_recursion_unlinked(state
, instructions
);
100 detect_conflicting_assignments(state
, instructions
);
102 state
->toplevel_ir
= NULL
;
104 /* Move all of the variable declarations to the front of the IR list, and
105 * reverse the order. This has the (intended!) side effect that vertex
106 * shader inputs and fragment shader outputs will appear in the IR in the
107 * same order that they appeared in the shader code. This results in the
108 * locations being assigned in the declared order. Many (arguably buggy)
109 * applications depend on this behavior, and it matches what nearly all
112 foreach_list_safe(node
, instructions
) {
113 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
119 instructions
->push_head(var
);
122 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
124 * If multiple shaders using members of a built-in block belonging to
125 * the same interface are linked together in the same program, they
126 * must all redeclare the built-in block in the same way, as described
127 * in section 4.3.7 "Interface Blocks" for interface block matching, or
128 * a link error will result.
130 * The phrase "using members of a built-in block" implies that if two
131 * shaders are linked together and one of them *does not use* any members
132 * of the built-in block, then that shader does not need to have a matching
133 * redeclaration of the built-in block.
135 * This appears to be a clarification to the behaviour established for
136 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
139 * The definition of "interface" in section 4.3.7 that applies here is as
142 * The boundary between adjacent programmable pipeline stages: This
143 * spans all the outputs in all compilation units of the first stage
144 * and all the inputs in all compilation units of the second stage.
146 * Therefore this rule applies to both inter- and intra-stage linking.
148 * The easiest way to implement this is to check whether the shader uses
149 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
150 * remove all the relevant variable declaration from the IR, so that the
151 * linker won't see them and complain about mismatches.
153 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
154 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
159 * If a conversion is available, convert one operand to a different type
161 * The \c from \c ir_rvalue is converted "in place".
163 * \param to Type that the operand it to be converted to
164 * \param from Operand that is being converted
165 * \param state GLSL compiler state
168 * If a conversion is possible (or unnecessary), \c true is returned.
169 * Otherwise \c false is returned.
172 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
173 struct _mesa_glsl_parse_state
*state
)
176 if (to
->base_type
== from
->type
->base_type
)
179 /* This conversion was added in GLSL 1.20. If the compilation mode is
180 * GLSL 1.10, the conversion is skipped.
182 if (!state
->is_version(120, 0))
185 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
187 * "There are no implicit array or structure conversions. For
188 * example, an array of int cannot be implicitly converted to an
189 * array of float. There are no implicit conversions between
190 * signed and unsigned integers."
192 /* FINISHME: The above comment is partially a lie. There is int/uint
193 * FINISHME: conversion for immediate constants.
195 if (!to
->is_float() || !from
->type
->is_numeric())
198 /* Convert to a floating point type with the same number of components
199 * as the original type - i.e. int to float, not int to vec4.
201 to
= glsl_type::get_instance(GLSL_TYPE_FLOAT
, from
->type
->vector_elements
,
202 from
->type
->matrix_columns
);
204 switch (from
->type
->base_type
) {
206 from
= new(ctx
) ir_expression(ir_unop_i2f
, to
, from
, NULL
);
209 from
= new(ctx
) ir_expression(ir_unop_u2f
, to
, from
, NULL
);
212 from
= new(ctx
) ir_expression(ir_unop_b2f
, to
, from
, NULL
);
222 static const struct glsl_type
*
223 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
225 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
227 const glsl_type
*type_a
= value_a
->type
;
228 const glsl_type
*type_b
= value_b
->type
;
230 /* From GLSL 1.50 spec, page 56:
232 * "The arithmetic binary operators add (+), subtract (-),
233 * multiply (*), and divide (/) operate on integer and
234 * floating-point scalars, vectors, and matrices."
236 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
237 _mesa_glsl_error(loc
, state
,
238 "operands to arithmetic operators must be numeric");
239 return glsl_type::error_type
;
243 /* "If one operand is floating-point based and the other is
244 * not, then the conversions from Section 4.1.10 "Implicit
245 * Conversions" are applied to the non-floating-point-based operand."
247 if (!apply_implicit_conversion(type_a
, value_b
, state
)
248 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
249 _mesa_glsl_error(loc
, state
,
250 "could not implicitly convert operands to "
251 "arithmetic operator");
252 return glsl_type::error_type
;
254 type_a
= value_a
->type
;
255 type_b
= value_b
->type
;
257 /* "If the operands are integer types, they must both be signed or
260 * From this rule and the preceeding conversion it can be inferred that
261 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
262 * The is_numeric check above already filtered out the case where either
263 * type is not one of these, so now the base types need only be tested for
266 if (type_a
->base_type
!= type_b
->base_type
) {
267 _mesa_glsl_error(loc
, state
,
268 "base type mismatch for arithmetic operator");
269 return glsl_type::error_type
;
272 /* "All arithmetic binary operators result in the same fundamental type
273 * (signed integer, unsigned integer, or floating-point) as the
274 * operands they operate on, after operand type conversion. After
275 * conversion, the following cases are valid
277 * * The two operands are scalars. In this case the operation is
278 * applied, resulting in a scalar."
280 if (type_a
->is_scalar() && type_b
->is_scalar())
283 /* "* One operand is a scalar, and the other is a vector or matrix.
284 * In this case, the scalar operation is applied independently to each
285 * component of the vector or matrix, resulting in the same size
288 if (type_a
->is_scalar()) {
289 if (!type_b
->is_scalar())
291 } else if (type_b
->is_scalar()) {
295 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
296 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
299 assert(!type_a
->is_scalar());
300 assert(!type_b
->is_scalar());
302 /* "* The two operands are vectors of the same size. In this case, the
303 * operation is done component-wise resulting in the same size
306 if (type_a
->is_vector() && type_b
->is_vector()) {
307 if (type_a
== type_b
) {
310 _mesa_glsl_error(loc
, state
,
311 "vector size mismatch for arithmetic operator");
312 return glsl_type::error_type
;
316 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
317 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
318 * <vector, vector> have been handled. At least one of the operands must
319 * be matrix. Further, since there are no integer matrix types, the base
320 * type of both operands must be float.
322 assert(type_a
->is_matrix() || type_b
->is_matrix());
323 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
);
324 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
);
326 /* "* The operator is add (+), subtract (-), or divide (/), and the
327 * operands are matrices with the same number of rows and the same
328 * number of columns. In this case, the operation is done component-
329 * wise resulting in the same size matrix."
330 * * The operator is multiply (*), where both operands are matrices or
331 * one operand is a vector and the other a matrix. A right vector
332 * operand is treated as a column vector and a left vector operand as a
333 * row vector. In all these cases, it is required that the number of
334 * columns of the left operand is equal to the number of rows of the
335 * right operand. Then, the multiply (*) operation does a linear
336 * algebraic multiply, yielding an object that has the same number of
337 * rows as the left operand and the same number of columns as the right
338 * operand. Section 5.10 "Vector and Matrix Operations" explains in
339 * more detail how vectors and matrices are operated on."
342 if (type_a
== type_b
)
345 if (type_a
->is_matrix() && type_b
->is_matrix()) {
346 /* Matrix multiply. The columns of A must match the rows of B. Given
347 * the other previously tested constraints, this means the vector type
348 * of a row from A must be the same as the vector type of a column from
351 if (type_a
->row_type() == type_b
->column_type()) {
352 /* The resulting matrix has the number of columns of matrix B and
353 * the number of rows of matrix A. We get the row count of A by
354 * looking at the size of a vector that makes up a column. The
355 * transpose (size of a row) is done for B.
357 const glsl_type
*const type
=
358 glsl_type::get_instance(type_a
->base_type
,
359 type_a
->column_type()->vector_elements
,
360 type_b
->row_type()->vector_elements
);
361 assert(type
!= glsl_type::error_type
);
365 } else if (type_a
->is_matrix()) {
366 /* A is a matrix and B is a column vector. Columns of A must match
367 * rows of B. Given the other previously tested constraints, this
368 * means the vector type of a row from A must be the same as the
369 * vector the type of B.
371 if (type_a
->row_type() == type_b
) {
372 /* The resulting vector has a number of elements equal to
373 * the number of rows of matrix A. */
374 const glsl_type
*const type
=
375 glsl_type::get_instance(type_a
->base_type
,
376 type_a
->column_type()->vector_elements
,
378 assert(type
!= glsl_type::error_type
);
383 assert(type_b
->is_matrix());
385 /* A is a row vector and B is a matrix. Columns of A must match rows
386 * of B. Given the other previously tested constraints, this means
387 * the type of A must be the same as the vector type of a column from
390 if (type_a
== type_b
->column_type()) {
391 /* The resulting vector has a number of elements equal to
392 * the number of columns of matrix B. */
393 const glsl_type
*const type
=
394 glsl_type::get_instance(type_a
->base_type
,
395 type_b
->row_type()->vector_elements
,
397 assert(type
!= glsl_type::error_type
);
403 _mesa_glsl_error(loc
, state
, "size mismatch for matrix multiplication");
404 return glsl_type::error_type
;
408 /* "All other cases are illegal."
410 _mesa_glsl_error(loc
, state
, "type mismatch");
411 return glsl_type::error_type
;
415 static const struct glsl_type
*
416 unary_arithmetic_result_type(const struct glsl_type
*type
,
417 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
419 /* From GLSL 1.50 spec, page 57:
421 * "The arithmetic unary operators negate (-), post- and pre-increment
422 * and decrement (-- and ++) operate on integer or floating-point
423 * values (including vectors and matrices). All unary operators work
424 * component-wise on their operands. These result with the same type
427 if (!type
->is_numeric()) {
428 _mesa_glsl_error(loc
, state
,
429 "operands to arithmetic operators must be numeric");
430 return glsl_type::error_type
;
437 * \brief Return the result type of a bit-logic operation.
439 * If the given types to the bit-logic operator are invalid, return
440 * glsl_type::error_type.
442 * \param type_a Type of LHS of bit-logic op
443 * \param type_b Type of RHS of bit-logic op
445 static const struct glsl_type
*
446 bit_logic_result_type(const struct glsl_type
*type_a
,
447 const struct glsl_type
*type_b
,
449 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
451 if (!state
->check_bitwise_operations_allowed(loc
)) {
452 return glsl_type::error_type
;
455 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
457 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
458 * (|). The operands must be of type signed or unsigned integers or
461 if (!type_a
->is_integer()) {
462 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
463 ast_expression::operator_string(op
));
464 return glsl_type::error_type
;
466 if (!type_b
->is_integer()) {
467 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
468 ast_expression::operator_string(op
));
469 return glsl_type::error_type
;
472 /* "The fundamental types of the operands (signed or unsigned) must
475 if (type_a
->base_type
!= type_b
->base_type
) {
476 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
477 "base type", ast_expression::operator_string(op
));
478 return glsl_type::error_type
;
481 /* "The operands cannot be vectors of differing size." */
482 if (type_a
->is_vector() &&
483 type_b
->is_vector() &&
484 type_a
->vector_elements
!= type_b
->vector_elements
) {
485 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
486 "different sizes", ast_expression::operator_string(op
));
487 return glsl_type::error_type
;
490 /* "If one operand is a scalar and the other a vector, the scalar is
491 * applied component-wise to the vector, resulting in the same type as
492 * the vector. The fundamental types of the operands [...] will be the
493 * resulting fundamental type."
495 if (type_a
->is_scalar())
501 static const struct glsl_type
*
502 modulus_result_type(const struct glsl_type
*type_a
,
503 const struct glsl_type
*type_b
,
504 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
506 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
507 return glsl_type::error_type
;
510 /* From GLSL 1.50 spec, page 56:
511 * "The operator modulus (%) operates on signed or unsigned integers or
512 * integer vectors. The operand types must both be signed or both be
515 if (!type_a
->is_integer()) {
516 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
517 return glsl_type::error_type
;
519 if (!type_b
->is_integer()) {
520 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
521 return glsl_type::error_type
;
523 if (type_a
->base_type
!= type_b
->base_type
) {
524 _mesa_glsl_error(loc
, state
,
525 "operands of %% must have the same base type");
526 return glsl_type::error_type
;
529 /* "The operands cannot be vectors of differing size. If one operand is
530 * a scalar and the other vector, then the scalar is applied component-
531 * wise to the vector, resulting in the same type as the vector. If both
532 * are vectors of the same size, the result is computed component-wise."
534 if (type_a
->is_vector()) {
535 if (!type_b
->is_vector()
536 || (type_a
->vector_elements
== type_b
->vector_elements
))
541 /* "The operator modulus (%) is not defined for any other data types
542 * (non-integer types)."
544 _mesa_glsl_error(loc
, state
, "type mismatch");
545 return glsl_type::error_type
;
549 static const struct glsl_type
*
550 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
551 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
553 const glsl_type
*type_a
= value_a
->type
;
554 const glsl_type
*type_b
= value_b
->type
;
556 /* From GLSL 1.50 spec, page 56:
557 * "The relational operators greater than (>), less than (<), greater
558 * than or equal (>=), and less than or equal (<=) operate only on
559 * scalar integer and scalar floating-point expressions."
561 if (!type_a
->is_numeric()
562 || !type_b
->is_numeric()
563 || !type_a
->is_scalar()
564 || !type_b
->is_scalar()) {
565 _mesa_glsl_error(loc
, state
,
566 "operands to relational operators must be scalar and "
568 return glsl_type::error_type
;
571 /* "Either the operands' types must match, or the conversions from
572 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
573 * operand, after which the types must match."
575 if (!apply_implicit_conversion(type_a
, value_b
, state
)
576 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
577 _mesa_glsl_error(loc
, state
,
578 "could not implicitly convert operands to "
579 "relational operator");
580 return glsl_type::error_type
;
582 type_a
= value_a
->type
;
583 type_b
= value_b
->type
;
585 if (type_a
->base_type
!= type_b
->base_type
) {
586 _mesa_glsl_error(loc
, state
, "base type mismatch");
587 return glsl_type::error_type
;
590 /* "The result is scalar Boolean."
592 return glsl_type::bool_type
;
596 * \brief Return the result type of a bit-shift operation.
598 * If the given types to the bit-shift operator are invalid, return
599 * glsl_type::error_type.
601 * \param type_a Type of LHS of bit-shift op
602 * \param type_b Type of RHS of bit-shift op
604 static const struct glsl_type
*
605 shift_result_type(const struct glsl_type
*type_a
,
606 const struct glsl_type
*type_b
,
608 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
610 if (!state
->check_bitwise_operations_allowed(loc
)) {
611 return glsl_type::error_type
;
614 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
616 * "The shift operators (<<) and (>>). For both operators, the operands
617 * must be signed or unsigned integers or integer vectors. One operand
618 * can be signed while the other is unsigned."
620 if (!type_a
->is_integer()) {
621 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
622 "integer vector", ast_expression::operator_string(op
));
623 return glsl_type::error_type
;
626 if (!type_b
->is_integer()) {
627 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
628 "integer vector", ast_expression::operator_string(op
));
629 return glsl_type::error_type
;
632 /* "If the first operand is a scalar, the second operand has to be
635 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
636 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
637 "second must be scalar as well",
638 ast_expression::operator_string(op
));
639 return glsl_type::error_type
;
642 /* If both operands are vectors, check that they have same number of
645 if (type_a
->is_vector() &&
646 type_b
->is_vector() &&
647 type_a
->vector_elements
!= type_b
->vector_elements
) {
648 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
649 "have same number of elements",
650 ast_expression::operator_string(op
));
651 return glsl_type::error_type
;
654 /* "In all cases, the resulting type will be the same type as the left
661 * Validates that a value can be assigned to a location with a specified type
663 * Validates that \c rhs can be assigned to some location. If the types are
664 * not an exact match but an automatic conversion is possible, \c rhs will be
668 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
669 * Otherwise the actual RHS to be assigned will be returned. This may be
670 * \c rhs, or it may be \c rhs after some type conversion.
673 * In addition to being used for assignments, this function is used to
674 * type-check return values.
677 validate_assignment(struct _mesa_glsl_parse_state
*state
,
678 YYLTYPE loc
, const glsl_type
*lhs_type
,
679 ir_rvalue
*rhs
, bool is_initializer
)
681 /* If there is already some error in the RHS, just return it. Anything
682 * else will lead to an avalanche of error message back to the user.
684 if (rhs
->type
->is_error())
687 /* If the types are identical, the assignment can trivially proceed.
689 if (rhs
->type
== lhs_type
)
692 /* If the array element types are the same and the LHS is unsized,
693 * the assignment is okay for initializers embedded in variable
696 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
697 * is handled by ir_dereference::is_lvalue.
699 if (is_initializer
&& lhs_type
->is_unsized_array() && rhs
->type
->is_array()
700 && (lhs_type
->element_type() == rhs
->type
->element_type())) {
704 /* Check for implicit conversion in GLSL 1.20 */
705 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
706 if (rhs
->type
== lhs_type
)
710 _mesa_glsl_error(&loc
, state
,
711 "%s of type %s cannot be assigned to "
712 "variable of type %s",
713 is_initializer
? "initializer" : "value",
714 rhs
->type
->name
, lhs_type
->name
);
720 mark_whole_array_access(ir_rvalue
*access
)
722 ir_dereference_variable
*deref
= access
->as_dereference_variable();
724 if (deref
&& deref
->var
) {
725 deref
->var
->max_array_access
= deref
->type
->length
- 1;
730 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
731 const char *non_lvalue_description
,
732 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
736 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
738 /* If the assignment LHS comes back as an ir_binop_vector_extract
739 * expression, move it to the RHS as an ir_triop_vector_insert.
741 if (lhs
->ir_type
== ir_type_expression
) {
742 ir_expression
*const expr
= lhs
->as_expression();
744 if (unlikely(expr
->operation
== ir_binop_vector_extract
)) {
746 validate_assignment(state
, lhs_loc
, lhs
->type
,
747 rhs
, is_initializer
);
749 if (new_rhs
== NULL
) {
752 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
753 expr
->operands
[0]->type
,
757 lhs
= expr
->operands
[0]->clone(ctx
, NULL
);
762 ir_variable
*lhs_var
= lhs
->variable_referenced();
764 lhs_var
->assigned
= true;
766 if (!error_emitted
) {
767 if (non_lvalue_description
!= NULL
) {
768 _mesa_glsl_error(&lhs_loc
, state
,
770 non_lvalue_description
);
771 error_emitted
= true;
772 } else if (lhs
->variable_referenced() != NULL
773 && lhs
->variable_referenced()->read_only
) {
774 _mesa_glsl_error(&lhs_loc
, state
,
775 "assignment to read-only variable '%s'",
776 lhs
->variable_referenced()->name
);
777 error_emitted
= true;
779 } else if (lhs
->type
->is_array() &&
780 !state
->check_version(120, 300, &lhs_loc
,
781 "whole array assignment forbidden")) {
782 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
784 * "Other binary or unary expressions, non-dereferenced
785 * arrays, function names, swizzles with repeated fields,
786 * and constants cannot be l-values."
788 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
790 error_emitted
= true;
791 } else if (!lhs
->is_lvalue()) {
792 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
793 error_emitted
= true;
798 validate_assignment(state
, lhs_loc
, lhs
->type
, rhs
, is_initializer
);
799 if (new_rhs
!= NULL
) {
802 /* If the LHS array was not declared with a size, it takes it size from
803 * the RHS. If the LHS is an l-value and a whole array, it must be a
804 * dereference of a variable. Any other case would require that the LHS
805 * is either not an l-value or not a whole array.
807 if (lhs
->type
->is_unsized_array()) {
808 ir_dereference
*const d
= lhs
->as_dereference();
812 ir_variable
*const var
= d
->variable_referenced();
816 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
817 /* FINISHME: This should actually log the location of the RHS. */
818 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
820 var
->max_array_access
);
823 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
824 rhs
->type
->array_size());
827 mark_whole_array_access(rhs
);
828 mark_whole_array_access(lhs
);
831 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
832 * but not post_inc) need the converted assigned value as an rvalue
833 * to handle things like:
837 * So we always just store the computed value being assigned to a
838 * temporary and return a deref of that temporary. If the rvalue
839 * ends up not being used, the temp will get copy-propagated out.
841 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
843 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
844 instructions
->push_tail(var
);
845 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
846 deref_var
= new(ctx
) ir_dereference_variable(var
);
849 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
851 return new(ctx
) ir_dereference_variable(var
);
855 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
857 void *ctx
= ralloc_parent(lvalue
);
860 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
862 instructions
->push_tail(var
);
863 var
->mode
= ir_var_auto
;
865 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
868 return new(ctx
) ir_dereference_variable(var
);
873 ast_node::hir(exec_list
*instructions
,
874 struct _mesa_glsl_parse_state
*state
)
883 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
886 ir_rvalue
*cmp
= NULL
;
888 if (operation
== ir_binop_all_equal
)
889 join_op
= ir_binop_logic_and
;
891 join_op
= ir_binop_logic_or
;
893 switch (op0
->type
->base_type
) {
894 case GLSL_TYPE_FLOAT
:
898 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
900 case GLSL_TYPE_ARRAY
: {
901 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
902 ir_rvalue
*e0
, *e1
, *result
;
904 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
905 new(mem_ctx
) ir_constant(i
));
906 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
907 new(mem_ctx
) ir_constant(i
));
908 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
911 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
917 mark_whole_array_access(op0
);
918 mark_whole_array_access(op1
);
922 case GLSL_TYPE_STRUCT
: {
923 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
924 ir_rvalue
*e0
, *e1
, *result
;
925 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
927 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
929 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
931 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
934 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
942 case GLSL_TYPE_ERROR
:
944 case GLSL_TYPE_SAMPLER
:
945 case GLSL_TYPE_INTERFACE
:
946 case GLSL_TYPE_ATOMIC_UINT
:
947 /* I assume a comparison of a struct containing a sampler just
948 * ignores the sampler present in the type.
954 cmp
= new(mem_ctx
) ir_constant(true);
959 /* For logical operations, we want to ensure that the operands are
960 * scalar booleans. If it isn't, emit an error and return a constant
961 * boolean to avoid triggering cascading error messages.
964 get_scalar_boolean_operand(exec_list
*instructions
,
965 struct _mesa_glsl_parse_state
*state
,
966 ast_expression
*parent_expr
,
968 const char *operand_name
,
971 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
973 ir_rvalue
*val
= expr
->hir(instructions
, state
);
975 if (val
->type
->is_boolean() && val
->type
->is_scalar())
978 if (!*error_emitted
) {
979 YYLTYPE loc
= expr
->get_location();
980 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
982 parent_expr
->operator_string(parent_expr
->oper
));
983 *error_emitted
= true;
986 return new(ctx
) ir_constant(true);
990 * If name refers to a builtin array whose maximum allowed size is less than
991 * size, report an error and return true. Otherwise return false.
994 check_builtin_array_max_size(const char *name
, unsigned size
,
995 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
997 if ((strcmp("gl_TexCoord", name
) == 0)
998 && (size
> state
->Const
.MaxTextureCoords
)) {
999 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1001 * "The size [of gl_TexCoord] can be at most
1002 * gl_MaxTextureCoords."
1004 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1005 "be larger than gl_MaxTextureCoords (%u)",
1006 state
->Const
.MaxTextureCoords
);
1007 } else if (strcmp("gl_ClipDistance", name
) == 0
1008 && size
> state
->Const
.MaxClipPlanes
) {
1009 /* From section 7.1 (Vertex Shader Special Variables) of the
1012 * "The gl_ClipDistance array is predeclared as unsized and
1013 * must be sized by the shader either redeclaring it with a
1014 * size or indexing it only with integral constant
1015 * expressions. ... The size can be at most
1016 * gl_MaxClipDistances."
1018 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1019 "be larger than gl_MaxClipDistances (%u)",
1020 state
->Const
.MaxClipPlanes
);
1025 * Create the constant 1, of a which is appropriate for incrementing and
1026 * decrementing values of the given GLSL type. For example, if type is vec4,
1027 * this creates a constant value of 1.0 having type float.
1029 * If the given type is invalid for increment and decrement operators, return
1030 * a floating point 1--the error will be detected later.
1033 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1035 switch (type
->base_type
) {
1036 case GLSL_TYPE_UINT
:
1037 return new(ctx
) ir_constant((unsigned) 1);
1039 return new(ctx
) ir_constant(1);
1041 case GLSL_TYPE_FLOAT
:
1042 return new(ctx
) ir_constant(1.0f
);
1047 ast_expression::hir(exec_list
*instructions
,
1048 struct _mesa_glsl_parse_state
*state
)
1051 static const int operations
[AST_NUM_OPERATORS
] = {
1052 -1, /* ast_assign doesn't convert to ir_expression. */
1053 -1, /* ast_plus doesn't convert to ir_expression. */
1067 ir_binop_any_nequal
,
1077 /* Note: The following block of expression types actually convert
1078 * to multiple IR instructions.
1080 ir_binop_mul
, /* ast_mul_assign */
1081 ir_binop_div
, /* ast_div_assign */
1082 ir_binop_mod
, /* ast_mod_assign */
1083 ir_binop_add
, /* ast_add_assign */
1084 ir_binop_sub
, /* ast_sub_assign */
1085 ir_binop_lshift
, /* ast_ls_assign */
1086 ir_binop_rshift
, /* ast_rs_assign */
1087 ir_binop_bit_and
, /* ast_and_assign */
1088 ir_binop_bit_xor
, /* ast_xor_assign */
1089 ir_binop_bit_or
, /* ast_or_assign */
1091 -1, /* ast_conditional doesn't convert to ir_expression. */
1092 ir_binop_add
, /* ast_pre_inc. */
1093 ir_binop_sub
, /* ast_pre_dec. */
1094 ir_binop_add
, /* ast_post_inc. */
1095 ir_binop_sub
, /* ast_post_dec. */
1096 -1, /* ast_field_selection doesn't conv to ir_expression. */
1097 -1, /* ast_array_index doesn't convert to ir_expression. */
1098 -1, /* ast_function_call doesn't conv to ir_expression. */
1099 -1, /* ast_identifier doesn't convert to ir_expression. */
1100 -1, /* ast_int_constant doesn't convert to ir_expression. */
1101 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1102 -1, /* ast_float_constant doesn't conv to ir_expression. */
1103 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1104 -1, /* ast_sequence doesn't convert to ir_expression. */
1106 ir_rvalue
*result
= NULL
;
1108 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1109 bool error_emitted
= false;
1112 loc
= this->get_location();
1114 switch (this->oper
) {
1116 assert(!"ast_aggregate: Should never get here.");
1120 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1121 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1123 result
= do_assignment(instructions
, state
,
1124 this->subexpressions
[0]->non_lvalue_description
,
1125 op
[0], op
[1], false,
1126 this->subexpressions
[0]->get_location());
1127 error_emitted
= result
->type
->is_error();
1132 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1134 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1136 error_emitted
= type
->is_error();
1142 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1144 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1146 error_emitted
= type
->is_error();
1148 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1156 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1157 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1159 type
= arithmetic_result_type(op
[0], op
[1],
1160 (this->oper
== ast_mul
),
1162 error_emitted
= type
->is_error();
1164 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1169 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1170 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1172 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1174 assert(operations
[this->oper
] == ir_binop_mod
);
1176 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1178 error_emitted
= type
->is_error();
1183 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1184 error_emitted
= true;
1187 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1188 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1189 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1191 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1193 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1200 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1201 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1203 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1205 /* The relational operators must either generate an error or result
1206 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1208 assert(type
->is_error()
1209 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1210 && type
->is_scalar()));
1212 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1214 error_emitted
= type
->is_error();
1219 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1220 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1222 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1224 * "The equality operators equal (==), and not equal (!=)
1225 * operate on all types. They result in a scalar Boolean. If
1226 * the operand types do not match, then there must be a
1227 * conversion from Section 4.1.10 "Implicit Conversions"
1228 * applied to one operand that can make them match, in which
1229 * case this conversion is done."
1231 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1232 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1233 || (op
[0]->type
!= op
[1]->type
)) {
1234 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1235 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1236 error_emitted
= true;
1237 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1238 !state
->check_version(120, 300, &loc
,
1239 "array comparisons forbidden")) {
1240 error_emitted
= true;
1241 } else if ((op
[0]->type
->contains_opaque() ||
1242 op
[1]->type
->contains_opaque())) {
1243 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1244 error_emitted
= true;
1247 if (error_emitted
) {
1248 result
= new(ctx
) ir_constant(false);
1250 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1251 assert(result
->type
== glsl_type::bool_type
);
1258 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1259 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1260 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1262 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1264 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1268 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1270 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1271 error_emitted
= true;
1274 if (!op
[0]->type
->is_integer()) {
1275 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1276 error_emitted
= true;
1279 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1280 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1283 case ast_logic_and
: {
1284 exec_list rhs_instructions
;
1285 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1286 "LHS", &error_emitted
);
1287 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1288 "RHS", &error_emitted
);
1290 if (rhs_instructions
.is_empty()) {
1291 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1292 type
= result
->type
;
1294 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1297 instructions
->push_tail(tmp
);
1299 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1300 instructions
->push_tail(stmt
);
1302 stmt
->then_instructions
.append_list(&rhs_instructions
);
1303 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1304 ir_assignment
*const then_assign
=
1305 new(ctx
) ir_assignment(then_deref
, op
[1]);
1306 stmt
->then_instructions
.push_tail(then_assign
);
1308 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1309 ir_assignment
*const else_assign
=
1310 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1311 stmt
->else_instructions
.push_tail(else_assign
);
1313 result
= new(ctx
) ir_dereference_variable(tmp
);
1319 case ast_logic_or
: {
1320 exec_list rhs_instructions
;
1321 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1322 "LHS", &error_emitted
);
1323 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1324 "RHS", &error_emitted
);
1326 if (rhs_instructions
.is_empty()) {
1327 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1328 type
= result
->type
;
1330 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1333 instructions
->push_tail(tmp
);
1335 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1336 instructions
->push_tail(stmt
);
1338 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1339 ir_assignment
*const then_assign
=
1340 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1341 stmt
->then_instructions
.push_tail(then_assign
);
1343 stmt
->else_instructions
.append_list(&rhs_instructions
);
1344 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1345 ir_assignment
*const else_assign
=
1346 new(ctx
) ir_assignment(else_deref
, op
[1]);
1347 stmt
->else_instructions
.push_tail(else_assign
);
1349 result
= new(ctx
) ir_dereference_variable(tmp
);
1356 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1358 * "The logical binary operators and (&&), or ( | | ), and
1359 * exclusive or (^^). They operate only on two Boolean
1360 * expressions and result in a Boolean expression."
1362 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1364 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1367 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1372 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1373 "operand", &error_emitted
);
1375 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1379 case ast_mul_assign
:
1380 case ast_div_assign
:
1381 case ast_add_assign
:
1382 case ast_sub_assign
: {
1383 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1384 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1386 type
= arithmetic_result_type(op
[0], op
[1],
1387 (this->oper
== ast_mul_assign
),
1390 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1393 result
= do_assignment(instructions
, state
,
1394 this->subexpressions
[0]->non_lvalue_description
,
1395 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1396 this->subexpressions
[0]->get_location());
1397 error_emitted
= (op
[0]->type
->is_error());
1399 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1400 * explicitly test for this because none of the binary expression
1401 * operators allow array operands either.
1407 case ast_mod_assign
: {
1408 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1409 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1411 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1413 assert(operations
[this->oper
] == ir_binop_mod
);
1415 ir_rvalue
*temp_rhs
;
1416 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1419 result
= do_assignment(instructions
, state
,
1420 this->subexpressions
[0]->non_lvalue_description
,
1421 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1422 this->subexpressions
[0]->get_location());
1423 error_emitted
= type
->is_error();
1428 case ast_rs_assign
: {
1429 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1430 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1431 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1433 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1434 type
, op
[0], op
[1]);
1435 result
= do_assignment(instructions
, state
,
1436 this->subexpressions
[0]->non_lvalue_description
,
1437 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1438 this->subexpressions
[0]->get_location());
1439 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1443 case ast_and_assign
:
1444 case ast_xor_assign
:
1445 case ast_or_assign
: {
1446 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1447 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1448 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1450 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1451 type
, op
[0], op
[1]);
1452 result
= do_assignment(instructions
, state
,
1453 this->subexpressions
[0]->non_lvalue_description
,
1454 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1455 this->subexpressions
[0]->get_location());
1456 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1460 case ast_conditional
: {
1461 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1463 * "The ternary selection operator (?:). It operates on three
1464 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1465 * first expression, which must result in a scalar Boolean."
1467 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1468 "condition", &error_emitted
);
1470 /* The :? operator is implemented by generating an anonymous temporary
1471 * followed by an if-statement. The last instruction in each branch of
1472 * the if-statement assigns a value to the anonymous temporary. This
1473 * temporary is the r-value of the expression.
1475 exec_list then_instructions
;
1476 exec_list else_instructions
;
1478 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1479 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1481 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1483 * "The second and third expressions can be any type, as
1484 * long their types match, or there is a conversion in
1485 * Section 4.1.10 "Implicit Conversions" that can be applied
1486 * to one of the expressions to make their types match. This
1487 * resulting matching type is the type of the entire
1490 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1491 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1492 || (op
[1]->type
!= op
[2]->type
)) {
1493 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1495 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1496 "operator must have matching types");
1497 error_emitted
= true;
1498 type
= glsl_type::error_type
;
1503 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1505 * "The second and third expressions must be the same type, but can
1506 * be of any type other than an array."
1508 if (type
->is_array() &&
1509 !state
->check_version(120, 300, &loc
,
1510 "second and third operands of ?: operator "
1511 "cannot be arrays")) {
1512 error_emitted
= true;
1515 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1516 ir_constant
*then_val
= op
[1]->constant_expression_value();
1517 ir_constant
*else_val
= op
[2]->constant_expression_value();
1519 if (then_instructions
.is_empty()
1520 && else_instructions
.is_empty()
1521 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1522 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1524 ir_variable
*const tmp
=
1525 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1526 instructions
->push_tail(tmp
);
1528 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1529 instructions
->push_tail(stmt
);
1531 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1532 ir_dereference
*const then_deref
=
1533 new(ctx
) ir_dereference_variable(tmp
);
1534 ir_assignment
*const then_assign
=
1535 new(ctx
) ir_assignment(then_deref
, op
[1]);
1536 stmt
->then_instructions
.push_tail(then_assign
);
1538 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1539 ir_dereference
*const else_deref
=
1540 new(ctx
) ir_dereference_variable(tmp
);
1541 ir_assignment
*const else_assign
=
1542 new(ctx
) ir_assignment(else_deref
, op
[2]);
1543 stmt
->else_instructions
.push_tail(else_assign
);
1545 result
= new(ctx
) ir_dereference_variable(tmp
);
1552 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1553 ? "pre-increment operation" : "pre-decrement operation";
1555 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1556 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1558 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1560 ir_rvalue
*temp_rhs
;
1561 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1564 result
= do_assignment(instructions
, state
,
1565 this->subexpressions
[0]->non_lvalue_description
,
1566 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1567 this->subexpressions
[0]->get_location());
1568 error_emitted
= op
[0]->type
->is_error();
1573 case ast_post_dec
: {
1574 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1575 ? "post-increment operation" : "post-decrement operation";
1576 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1577 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1579 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1581 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1583 ir_rvalue
*temp_rhs
;
1584 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1587 /* Get a temporary of a copy of the lvalue before it's modified.
1588 * This may get thrown away later.
1590 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1592 (void)do_assignment(instructions
, state
,
1593 this->subexpressions
[0]->non_lvalue_description
,
1594 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1595 this->subexpressions
[0]->get_location());
1597 error_emitted
= op
[0]->type
->is_error();
1601 case ast_field_selection
:
1602 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1605 case ast_array_index
: {
1606 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1608 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1609 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1611 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1614 if (result
->type
->is_error())
1615 error_emitted
= true;
1620 case ast_function_call
:
1621 /* Should *NEVER* get here. ast_function_call should always be handled
1622 * by ast_function_expression::hir.
1627 case ast_identifier
: {
1628 /* ast_identifier can appear several places in a full abstract syntax
1629 * tree. This particular use must be at location specified in the grammar
1630 * as 'variable_identifier'.
1633 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1637 result
= new(ctx
) ir_dereference_variable(var
);
1639 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1640 this->primary_expression
.identifier
);
1642 result
= ir_rvalue::error_value(ctx
);
1643 error_emitted
= true;
1648 case ast_int_constant
:
1649 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1652 case ast_uint_constant
:
1653 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1656 case ast_float_constant
:
1657 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1660 case ast_bool_constant
:
1661 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1664 case ast_sequence
: {
1665 /* It should not be possible to generate a sequence in the AST without
1666 * any expressions in it.
1668 assert(!this->expressions
.is_empty());
1670 /* The r-value of a sequence is the last expression in the sequence. If
1671 * the other expressions in the sequence do not have side-effects (and
1672 * therefore add instructions to the instruction list), they get dropped
1675 exec_node
*previous_tail_pred
= NULL
;
1676 YYLTYPE previous_operand_loc
= loc
;
1678 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1679 /* If one of the operands of comma operator does not generate any
1680 * code, we want to emit a warning. At each pass through the loop
1681 * previous_tail_pred will point to the last instruction in the
1682 * stream *before* processing the previous operand. Naturally,
1683 * instructions->tail_pred will point to the last instruction in the
1684 * stream *after* processing the previous operand. If the two
1685 * pointers match, then the previous operand had no effect.
1687 * The warning behavior here differs slightly from GCC. GCC will
1688 * only emit a warning if none of the left-hand operands have an
1689 * effect. However, it will emit a warning for each. I believe that
1690 * there are some cases in C (especially with GCC extensions) where
1691 * it is useful to have an intermediate step in a sequence have no
1692 * effect, but I don't think these cases exist in GLSL. Either way,
1693 * it would be a giant hassle to replicate that behavior.
1695 if (previous_tail_pred
== instructions
->tail_pred
) {
1696 _mesa_glsl_warning(&previous_operand_loc
, state
,
1697 "left-hand operand of comma expression has "
1701 /* tail_pred is directly accessed instead of using the get_tail()
1702 * method for performance reasons. get_tail() has extra code to
1703 * return NULL when the list is empty. We don't care about that
1704 * here, so using tail_pred directly is fine.
1706 previous_tail_pred
= instructions
->tail_pred
;
1707 previous_operand_loc
= ast
->get_location();
1709 result
= ast
->hir(instructions
, state
);
1712 /* Any errors should have already been emitted in the loop above.
1714 error_emitted
= true;
1718 type
= NULL
; /* use result->type, not type. */
1719 assert(result
!= NULL
);
1721 if (result
->type
->is_error() && !error_emitted
)
1722 _mesa_glsl_error(& loc
, state
, "type mismatch");
1729 ast_expression_statement::hir(exec_list
*instructions
,
1730 struct _mesa_glsl_parse_state
*state
)
1732 /* It is possible to have expression statements that don't have an
1733 * expression. This is the solitary semicolon:
1735 * for (i = 0; i < 5; i++)
1738 * In this case the expression will be NULL. Test for NULL and don't do
1739 * anything in that case.
1741 if (expression
!= NULL
)
1742 expression
->hir(instructions
, state
);
1744 /* Statements do not have r-values.
1751 ast_compound_statement::hir(exec_list
*instructions
,
1752 struct _mesa_glsl_parse_state
*state
)
1755 state
->symbols
->push_scope();
1757 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1758 ast
->hir(instructions
, state
);
1761 state
->symbols
->pop_scope();
1763 /* Compound statements do not have r-values.
1769 static const glsl_type
*
1770 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1771 struct _mesa_glsl_parse_state
*state
)
1773 unsigned length
= 0;
1776 return glsl_type::error_type
;
1778 /* From page 19 (page 25) of the GLSL 1.20 spec:
1780 * "Only one-dimensional arrays may be declared."
1782 if (base
->is_array()) {
1783 _mesa_glsl_error(loc
, state
,
1784 "invalid array of `%s' (only one-dimensional arrays "
1787 return glsl_type::error_type
;
1790 if (array_size
!= NULL
) {
1791 exec_list dummy_instructions
;
1792 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1793 YYLTYPE loc
= array_size
->get_location();
1796 if (!ir
->type
->is_integer()) {
1797 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1798 } else if (!ir
->type
->is_scalar()) {
1799 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1801 ir_constant
*const size
= ir
->constant_expression_value();
1804 _mesa_glsl_error(& loc
, state
, "array size must be a "
1805 "constant valued expression");
1806 } else if (size
->value
.i
[0] <= 0) {
1807 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1809 assert(size
->type
== ir
->type
);
1810 length
= size
->value
.u
[0];
1812 /* If the array size is const (and we've verified that
1813 * it is) then no instructions should have been emitted
1814 * when we converted it to HIR. If they were emitted,
1815 * then either the array size isn't const after all, or
1816 * we are emitting unnecessary instructions.
1818 assert(dummy_instructions
.is_empty());
1824 const glsl_type
*array_type
= glsl_type::get_array_instance(base
, length
);
1825 return array_type
!= NULL
? array_type
: glsl_type::error_type
;
1830 ast_type_specifier::glsl_type(const char **name
,
1831 struct _mesa_glsl_parse_state
*state
) const
1833 const struct glsl_type
*type
;
1835 type
= state
->symbols
->get_type(this->type_name
);
1836 *name
= this->type_name
;
1838 if (this->is_array
) {
1839 YYLTYPE loc
= this->get_location();
1840 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1847 ast_fully_specified_type::glsl_type(const char **name
,
1848 struct _mesa_glsl_parse_state
*state
) const
1850 const struct glsl_type
*type
= this->specifier
->glsl_type(name
, state
);
1855 if (type
->base_type
== GLSL_TYPE_FLOAT
1857 && state
->target
== fragment_shader
1858 && this->qualifier
.precision
== ast_precision_none
1859 && state
->symbols
->get_variable("#default precision") == NULL
) {
1860 YYLTYPE loc
= this->get_location();
1861 _mesa_glsl_error(&loc
, state
,
1862 "no precision specified this scope for type `%s'",
1870 * Determine whether a toplevel variable declaration declares a varying. This
1871 * function operates by examining the variable's mode and the shader target,
1872 * so it correctly identifies linkage variables regardless of whether they are
1873 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1875 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1876 * this function will produce undefined results.
1879 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1883 return var
->mode
== ir_var_shader_out
;
1884 case fragment_shader
:
1885 return var
->mode
== ir_var_shader_in
;
1887 return var
->mode
== ir_var_shader_out
|| var
->mode
== ir_var_shader_in
;
1893 * Matrix layout qualifiers are only allowed on certain types
1896 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1898 const glsl_type
*type
,
1901 if (var
&& !var
->is_in_uniform_block()) {
1902 /* Layout qualifiers may only apply to interface blocks and fields in
1905 _mesa_glsl_error(loc
, state
,
1906 "uniform block layout qualifiers row_major and "
1907 "column_major may not be applied to variables "
1908 "outside of uniform blocks");
1909 } else if (!type
->is_matrix()) {
1910 /* The OpenGL ES 3.0 conformance tests did not originally allow
1911 * matrix layout qualifiers on non-matrices. However, the OpenGL
1912 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
1913 * amended to specifically allow these layouts on all types. Emit
1914 * a warning so that people know their code may not be portable.
1916 _mesa_glsl_warning(loc
, state
,
1917 "uniform block layout qualifiers row_major and "
1918 "column_major applied to non-matrix types may "
1919 "be rejected by older compilers");
1920 } else if (type
->is_record()) {
1921 /* We allow 'layout(row_major)' on structure types because it's the only
1922 * way to get row-major layouts on matrices contained in structures.
1924 _mesa_glsl_warning(loc
, state
,
1925 "uniform block layout qualifiers row_major and "
1926 "column_major applied to structure types is not "
1927 "strictly conformant and may be rejected by other "
1933 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
1936 const ast_type_qualifier
*qual
)
1938 if (var
->mode
!= ir_var_uniform
) {
1939 _mesa_glsl_error(loc
, state
,
1940 "the \"binding\" qualifier only applies to uniforms");
1944 if (qual
->binding
< 0) {
1945 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
1949 const struct gl_context
*const ctx
= state
->ctx
;
1950 unsigned elements
= var
->type
->is_array() ? var
->type
->length
: 1;
1951 unsigned max_index
= qual
->binding
+ elements
- 1;
1953 if (var
->type
->is_interface()) {
1954 /* UBOs. From page 60 of the GLSL 4.20 specification:
1955 * "If the binding point for any uniform block instance is less than zero,
1956 * or greater than or equal to the implementation-dependent maximum
1957 * number of uniform buffer bindings, a compilation error will occur.
1958 * When the binding identifier is used with a uniform block instanced as
1959 * an array of size N, all elements of the array from binding through
1960 * binding + N – 1 must be within this range."
1962 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
1964 if (max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
1965 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
1966 "the maximum number of UBO binding points (%d)",
1967 qual
->binding
, elements
,
1968 ctx
->Const
.MaxUniformBufferBindings
);
1971 } else if (var
->type
->is_sampler() ||
1972 (var
->type
->is_array() && var
->type
->fields
.array
->is_sampler())) {
1973 /* Samplers. From page 63 of the GLSL 4.20 specification:
1974 * "If the binding is less than zero, or greater than or equal to the
1975 * implementation-dependent maximum supported number of units, a
1976 * compilation error will occur. When the binding identifier is used
1977 * with an array of size N, all elements of the array from binding
1978 * through binding + N - 1 must be within this range."
1981 switch (state
->target
) {
1983 limit
= ctx
->Const
.VertexProgram
.MaxTextureImageUnits
;
1985 case geometry_shader
:
1986 limit
= ctx
->Const
.GeometryProgram
.MaxTextureImageUnits
;
1988 case fragment_shader
:
1989 limit
= ctx
->Const
.FragmentProgram
.MaxTextureImageUnits
;
1993 if (max_index
>= limit
) {
1994 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
1995 "exceeds the maximum number of texture image units "
1996 "(%d)", qual
->binding
, elements
, limit
);
2001 _mesa_glsl_error(loc
, state
,
2002 "the \"binding\" qualifier only applies to uniform "
2003 "blocks, samplers, or arrays of samplers");
2011 static glsl_interp_qualifier
2012 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2013 ir_variable_mode mode
,
2014 struct _mesa_glsl_parse_state
*state
,
2017 glsl_interp_qualifier interpolation
;
2018 if (qual
->flags
.q
.flat
)
2019 interpolation
= INTERP_QUALIFIER_FLAT
;
2020 else if (qual
->flags
.q
.noperspective
)
2021 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2022 else if (qual
->flags
.q
.smooth
)
2023 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2025 interpolation
= INTERP_QUALIFIER_NONE
;
2027 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2028 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2029 _mesa_glsl_error(loc
, state
,
2030 "interpolation qualifier `%s' can only be applied to "
2031 "shader inputs or outputs.",
2032 interpolation_string(interpolation
));
2036 if ((state
->target
== vertex_shader
&& mode
== ir_var_shader_in
) ||
2037 (state
->target
== fragment_shader
&& mode
== ir_var_shader_out
)) {
2038 _mesa_glsl_error(loc
, state
,
2039 "interpolation qualifier `%s' cannot be applied to "
2040 "vertex shader inputs or fragment shader outputs",
2041 interpolation_string(interpolation
));
2045 return interpolation
;
2050 validate_explicit_location(const struct ast_type_qualifier
*qual
,
2052 struct _mesa_glsl_parse_state
*state
,
2057 /* In the vertex shader only shader inputs can be given explicit
2060 * In the fragment shader only shader outputs can be given explicit
2063 switch (state
->target
) {
2065 if (var
->mode
== ir_var_shader_in
) {
2072 case geometry_shader
:
2073 _mesa_glsl_error(loc
, state
,
2074 "geometry shader variables cannot be given "
2075 "explicit locations");
2078 case fragment_shader
:
2079 if (var
->mode
== ir_var_shader_out
) {
2088 _mesa_glsl_error(loc
, state
,
2089 "%s cannot be given an explicit location in %s shader",
2091 _mesa_glsl_shader_target_name(state
->target
));
2093 var
->explicit_location
= true;
2095 /* This bit of silliness is needed because invalid explicit locations
2096 * are supposed to be flagged during linking. Small negative values
2097 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2098 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2099 * The linker needs to be able to differentiate these cases. This
2100 * ensures that negative values stay negative.
2102 if (qual
->location
>= 0) {
2103 var
->location
= (state
->target
== vertex_shader
)
2104 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2105 : (qual
->location
+ FRAG_RESULT_DATA0
);
2107 var
->location
= qual
->location
;
2110 if (qual
->flags
.q
.explicit_index
) {
2111 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2112 * Layout Qualifiers):
2114 * "It is also a compile-time error if a fragment shader
2115 * sets a layout index to less than 0 or greater than 1."
2117 * Older specifications don't mandate a behavior; we take
2118 * this as a clarification and always generate the error.
2120 if (qual
->index
< 0 || qual
->index
> 1) {
2121 _mesa_glsl_error(loc
, state
,
2122 "explicit index may only be 0 or 1");
2124 var
->explicit_index
= true;
2125 var
->index
= qual
->index
;
2132 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2134 struct _mesa_glsl_parse_state
*state
,
2138 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
2140 if (qual
->flags
.q
.invariant
) {
2142 _mesa_glsl_error(loc
, state
,
2143 "variable `%s' may not be redeclared "
2144 "`invariant' after being used",
2151 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
2152 || qual
->flags
.q
.uniform
2153 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
2156 if (qual
->flags
.q
.centroid
)
2159 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
2160 var
->type
= glsl_type::error_type
;
2161 _mesa_glsl_error(loc
, state
,
2162 "`attribute' variables may not be declared in the "
2164 _mesa_glsl_shader_target_name(state
->target
));
2167 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2169 * "However, the const qualifier cannot be used with out or inout."
2171 * The same section of the GLSL 4.40 spec further clarifies this saying:
2173 * "The const qualifier cannot be used with out or inout, or a
2174 * compile-time error results."
2176 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2177 _mesa_glsl_error(loc
, state
,
2178 "`const' may not be applied to `out' or `inout' "
2179 "function parameters");
2182 /* If there is no qualifier that changes the mode of the variable, leave
2183 * the setting alone.
2185 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2186 var
->mode
= ir_var_function_inout
;
2187 else if (qual
->flags
.q
.in
)
2188 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2189 else if (qual
->flags
.q
.attribute
2190 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
2191 var
->mode
= ir_var_shader_in
;
2192 else if (qual
->flags
.q
.out
)
2193 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2194 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
2195 var
->mode
= ir_var_shader_out
;
2196 else if (qual
->flags
.q
.uniform
)
2197 var
->mode
= ir_var_uniform
;
2199 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
2200 /* This variable is being used to link data between shader stages (in
2201 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2202 * that is allowed for such purposes.
2204 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2206 * "The varying qualifier can be used only with the data types
2207 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2210 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2211 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2213 * "Fragment inputs can only be signed and unsigned integers and
2214 * integer vectors, float, floating-point vectors, matrices, or
2215 * arrays of these. Structures cannot be input.
2217 * Similar text exists in the section on vertex shader outputs.
2219 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2220 * 3.00 spec allows structs as well. Varying structs are also allowed
2223 switch (var
->type
->get_scalar_type()->base_type
) {
2224 case GLSL_TYPE_FLOAT
:
2225 /* Ok in all GLSL versions */
2227 case GLSL_TYPE_UINT
:
2229 if (state
->is_version(130, 300))
2231 _mesa_glsl_error(loc
, state
,
2232 "varying variables must be of base type float in %s",
2233 state
->get_version_string());
2235 case GLSL_TYPE_STRUCT
:
2236 if (state
->is_version(150, 300))
2238 _mesa_glsl_error(loc
, state
,
2239 "varying variables may not be of type struct");
2242 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2247 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2248 switch (state
->target
) {
2250 if (var
->mode
== ir_var_shader_out
)
2251 var
->invariant
= true;
2253 case geometry_shader
:
2254 if ((var
->mode
== ir_var_shader_in
)
2255 || (var
->mode
== ir_var_shader_out
))
2256 var
->invariant
= true;
2258 case fragment_shader
:
2259 if (var
->mode
== ir_var_shader_in
)
2260 var
->invariant
= true;
2265 var
->interpolation
=
2266 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->mode
,
2269 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2270 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2271 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2272 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2273 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2274 ? "origin_upper_left" : "pixel_center_integer";
2276 _mesa_glsl_error(loc
, state
,
2277 "layout qualifier `%s' can only be applied to "
2278 "fragment shader input `gl_FragCoord'",
2282 if (qual
->flags
.q
.explicit_location
) {
2283 validate_explicit_location(qual
, var
, state
, loc
);
2284 } else if (qual
->flags
.q
.explicit_index
) {
2285 _mesa_glsl_error(loc
, state
,
2286 "explicit index requires explicit location");
2289 if (qual
->flags
.q
.explicit_binding
&&
2290 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2291 var
->explicit_binding
= true;
2292 var
->binding
= qual
->binding
;
2295 /* Does the declaration use the deprecated 'attribute' or 'varying'
2298 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2299 || qual
->flags
.q
.varying
;
2301 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2302 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2303 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2304 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2305 * These extensions and all following extensions that add the 'layout'
2306 * keyword have been modified to require the use of 'in' or 'out'.
2308 * The following extension do not allow the deprecated keywords:
2310 * GL_AMD_conservative_depth
2311 * GL_ARB_conservative_depth
2312 * GL_ARB_gpu_shader5
2313 * GL_ARB_separate_shader_objects
2314 * GL_ARB_tesselation_shader
2315 * GL_ARB_transform_feedback3
2316 * GL_ARB_uniform_buffer_object
2318 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2319 * allow layout with the deprecated keywords.
2321 const bool relaxed_layout_qualifier_checking
=
2322 state
->ARB_fragment_coord_conventions_enable
;
2324 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2325 if (relaxed_layout_qualifier_checking
) {
2326 _mesa_glsl_warning(loc
, state
,
2327 "`layout' qualifier may not be used with "
2328 "`attribute' or `varying'");
2330 _mesa_glsl_error(loc
, state
,
2331 "`layout' qualifier may not be used with "
2332 "`attribute' or `varying'");
2336 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2337 * AMD_conservative_depth.
2339 int depth_layout_count
= qual
->flags
.q
.depth_any
2340 + qual
->flags
.q
.depth_greater
2341 + qual
->flags
.q
.depth_less
2342 + qual
->flags
.q
.depth_unchanged
;
2343 if (depth_layout_count
> 0
2344 && !state
->AMD_conservative_depth_enable
2345 && !state
->ARB_conservative_depth_enable
) {
2346 _mesa_glsl_error(loc
, state
,
2347 "extension GL_AMD_conservative_depth or "
2348 "GL_ARB_conservative_depth must be enabled "
2349 "to use depth layout qualifiers");
2350 } else if (depth_layout_count
> 0
2351 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2352 _mesa_glsl_error(loc
, state
,
2353 "depth layout qualifiers can be applied only to "
2355 } else if (depth_layout_count
> 1
2356 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2357 _mesa_glsl_error(loc
, state
,
2358 "at most one depth layout qualifier can be applied to "
2361 if (qual
->flags
.q
.depth_any
)
2362 var
->depth_layout
= ir_depth_layout_any
;
2363 else if (qual
->flags
.q
.depth_greater
)
2364 var
->depth_layout
= ir_depth_layout_greater
;
2365 else if (qual
->flags
.q
.depth_less
)
2366 var
->depth_layout
= ir_depth_layout_less
;
2367 else if (qual
->flags
.q
.depth_unchanged
)
2368 var
->depth_layout
= ir_depth_layout_unchanged
;
2370 var
->depth_layout
= ir_depth_layout_none
;
2372 if (qual
->flags
.q
.std140
||
2373 qual
->flags
.q
.packed
||
2374 qual
->flags
.q
.shared
) {
2375 _mesa_glsl_error(loc
, state
,
2376 "uniform block layout qualifiers std140, packed, and "
2377 "shared can only be applied to uniform blocks, not "
2381 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2382 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
2387 * Get the variable that is being redeclared by this declaration
2389 * Semantic checks to verify the validity of the redeclaration are also
2390 * performed. If semantic checks fail, compilation error will be emitted via
2391 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2394 * A pointer to an existing variable in the current scope if the declaration
2395 * is a redeclaration, \c NULL otherwise.
2397 static ir_variable
*
2398 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
2399 struct _mesa_glsl_parse_state
*state
,
2400 bool allow_all_redeclarations
)
2402 /* Check if this declaration is actually a re-declaration, either to
2403 * resize an array or add qualifiers to an existing variable.
2405 * This is allowed for variables in the current scope, or when at
2406 * global scope (for built-ins in the implicit outer scope).
2408 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
2409 if (earlier
== NULL
||
2410 (state
->current_function
!= NULL
&&
2411 !state
->symbols
->name_declared_this_scope(var
->name
))) {
2416 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2418 * "It is legal to declare an array without a size and then
2419 * later re-declare the same name as an array of the same
2420 * type and specify a size."
2422 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
2423 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2424 /* FINISHME: This doesn't match the qualifiers on the two
2425 * FINISHME: declarations. It's not 100% clear whether this is
2426 * FINISHME: required or not.
2429 const unsigned size
= unsigned(var
->type
->array_size());
2430 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2431 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2432 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2434 earlier
->max_array_access
);
2437 earlier
->type
= var
->type
;
2440 } else if ((state
->ARB_fragment_coord_conventions_enable
||
2441 state
->is_version(150, 0))
2442 && strcmp(var
->name
, "gl_FragCoord") == 0
2443 && earlier
->type
== var
->type
2444 && earlier
->mode
== var
->mode
) {
2445 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2448 earlier
->origin_upper_left
= var
->origin_upper_left
;
2449 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2451 /* According to section 4.3.7 of the GLSL 1.30 spec,
2452 * the following built-in varaibles can be redeclared with an
2453 * interpolation qualifier:
2456 * * gl_FrontSecondaryColor
2457 * * gl_BackSecondaryColor
2459 * * gl_SecondaryColor
2461 } else if (state
->is_version(130, 0)
2462 && (strcmp(var
->name
, "gl_FrontColor") == 0
2463 || strcmp(var
->name
, "gl_BackColor") == 0
2464 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2465 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2466 || strcmp(var
->name
, "gl_Color") == 0
2467 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2468 && earlier
->type
== var
->type
2469 && earlier
->mode
== var
->mode
) {
2470 earlier
->interpolation
= var
->interpolation
;
2472 /* Layout qualifiers for gl_FragDepth. */
2473 } else if ((state
->AMD_conservative_depth_enable
||
2474 state
->ARB_conservative_depth_enable
)
2475 && strcmp(var
->name
, "gl_FragDepth") == 0
2476 && earlier
->type
== var
->type
2477 && earlier
->mode
== var
->mode
) {
2479 /** From the AMD_conservative_depth spec:
2480 * Within any shader, the first redeclarations of gl_FragDepth
2481 * must appear before any use of gl_FragDepth.
2483 if (earlier
->used
) {
2484 _mesa_glsl_error(&loc
, state
,
2485 "the first redeclaration of gl_FragDepth "
2486 "must appear before any use of gl_FragDepth");
2489 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2490 if (earlier
->depth_layout
!= ir_depth_layout_none
2491 && earlier
->depth_layout
!= var
->depth_layout
) {
2492 _mesa_glsl_error(&loc
, state
,
2493 "gl_FragDepth: depth layout is declared here "
2494 "as '%s, but it was previously declared as "
2496 depth_layout_string(var
->depth_layout
),
2497 depth_layout_string(earlier
->depth_layout
));
2500 earlier
->depth_layout
= var
->depth_layout
;
2502 } else if (allow_all_redeclarations
) {
2503 if (earlier
->mode
!= var
->mode
) {
2504 _mesa_glsl_error(&loc
, state
,
2505 "redeclaration of `%s' with incorrect qualifiers",
2507 } else if (earlier
->type
!= var
->type
) {
2508 _mesa_glsl_error(&loc
, state
,
2509 "redeclaration of `%s' has incorrect type",
2513 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
2520 * Generate the IR for an initializer in a variable declaration
2523 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2524 ast_fully_specified_type
*type
,
2525 exec_list
*initializer_instructions
,
2526 struct _mesa_glsl_parse_state
*state
)
2528 ir_rvalue
*result
= NULL
;
2530 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2532 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2534 * "All uniform variables are read-only and are initialized either
2535 * directly by an application via API commands, or indirectly by
2538 if (var
->mode
== ir_var_uniform
) {
2539 state
->check_version(120, 0, &initializer_loc
,
2540 "cannot initialize uniforms");
2543 if (var
->type
->is_sampler()) {
2544 _mesa_glsl_error(& initializer_loc
, state
,
2545 "cannot initialize samplers");
2548 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2549 _mesa_glsl_error(& initializer_loc
, state
,
2550 "cannot initialize %s shader input / %s",
2551 _mesa_glsl_shader_target_name(state
->target
),
2552 (state
->target
== vertex_shader
)
2553 ? "attribute" : "varying");
2556 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2557 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2560 /* Calculate the constant value if this is a const or uniform
2563 if (type
->qualifier
.flags
.q
.constant
2564 || type
->qualifier
.flags
.q
.uniform
) {
2565 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
2566 var
->type
, rhs
, true);
2567 if (new_rhs
!= NULL
) {
2570 ir_constant
*constant_value
= rhs
->constant_expression_value();
2571 if (!constant_value
) {
2572 /* If ARB_shading_language_420pack is enabled, initializers of
2573 * const-qualified local variables do not have to be constant
2574 * expressions. Const-qualified global variables must still be
2575 * initialized with constant expressions.
2577 if (!state
->ARB_shading_language_420pack_enable
2578 || state
->current_function
== NULL
) {
2579 _mesa_glsl_error(& initializer_loc
, state
,
2580 "initializer of %s variable `%s' must be a "
2581 "constant expression",
2582 (type
->qualifier
.flags
.q
.constant
)
2583 ? "const" : "uniform",
2585 if (var
->type
->is_numeric()) {
2586 /* Reduce cascading errors. */
2587 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2591 rhs
= constant_value
;
2592 var
->constant_value
= constant_value
;
2595 if (var
->type
->is_numeric()) {
2596 /* Reduce cascading errors. */
2597 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2602 if (rhs
&& !rhs
->type
->is_error()) {
2603 bool temp
= var
->read_only
;
2604 if (type
->qualifier
.flags
.q
.constant
)
2605 var
->read_only
= false;
2607 /* Never emit code to initialize a uniform.
2609 const glsl_type
*initializer_type
;
2610 if (!type
->qualifier
.flags
.q
.uniform
) {
2611 result
= do_assignment(initializer_instructions
, state
,
2614 type
->get_location());
2615 initializer_type
= result
->type
;
2617 initializer_type
= rhs
->type
;
2619 var
->constant_initializer
= rhs
->constant_expression_value();
2620 var
->has_initializer
= true;
2622 /* If the declared variable is an unsized array, it must inherrit
2623 * its full type from the initializer. A declaration such as
2625 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2629 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2631 * The assignment generated in the if-statement (below) will also
2632 * automatically handle this case for non-uniforms.
2634 * If the declared variable is not an array, the types must
2635 * already match exactly. As a result, the type assignment
2636 * here can be done unconditionally. For non-uniforms the call
2637 * to do_assignment can change the type of the initializer (via
2638 * the implicit conversion rules). For uniforms the initializer
2639 * must be a constant expression, and the type of that expression
2640 * was validated above.
2642 var
->type
= initializer_type
;
2644 var
->read_only
= temp
;
2652 * Do additional processing necessary for geometry shader input declarations
2653 * (this covers both interface blocks arrays and bare input variables).
2656 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
2657 YYLTYPE loc
, ir_variable
*var
)
2659 unsigned num_vertices
= 0;
2660 if (state
->gs_input_prim_type_specified
) {
2661 num_vertices
= vertices_per_prim(state
->gs_input_prim_type
);
2664 /* Geometry shader input variables must be arrays. Caller should have
2665 * reported an error for this.
2667 if (!var
->type
->is_array()) {
2668 assert(state
->error
);
2670 /* To avoid cascading failures, short circuit the checks below. */
2674 if (var
->type
->is_unsized_array()) {
2675 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
2677 * All geometry shader input unsized array declarations will be
2678 * sized by an earlier input layout qualifier, when present, as per
2679 * the following table.
2681 * Followed by a table mapping each allowed input layout qualifier to
2682 * the corresponding input length.
2684 if (num_vertices
!= 0)
2685 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
2688 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
2689 * includes the following examples of compile-time errors:
2691 * // code sequence within one shader...
2692 * in vec4 Color1[]; // size unknown
2693 * ...Color1.length()...// illegal, length() unknown
2694 * in vec4 Color2[2]; // size is 2
2695 * ...Color1.length()...// illegal, Color1 still has no size
2696 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
2697 * layout(lines) in; // legal, input size is 2, matching
2698 * in vec4 Color4[3]; // illegal, contradicts layout
2701 * To detect the case illustrated by Color3, we verify that the size of
2702 * an explicitly-sized array matches the size of any previously declared
2703 * explicitly-sized array. To detect the case illustrated by Color4, we
2704 * verify that the size of an explicitly-sized array is consistent with
2705 * any previously declared input layout.
2707 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
2708 _mesa_glsl_error(&loc
, state
,
2709 "geometry shader input size contradicts previously"
2710 " declared layout (size is %u, but layout requires a"
2711 " size of %u)", var
->type
->length
, num_vertices
);
2712 } else if (state
->gs_input_size
!= 0 &&
2713 var
->type
->length
!= state
->gs_input_size
) {
2714 _mesa_glsl_error(&loc
, state
,
2715 "geometry shader input sizes are "
2716 "inconsistent (size is %u, but a previous "
2717 "declaration has size %u)",
2718 var
->type
->length
, state
->gs_input_size
);
2720 state
->gs_input_size
= var
->type
->length
;
2727 validate_identifier(const char *identifier
, YYLTYPE loc
,
2728 struct _mesa_glsl_parse_state
*state
)
2730 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2732 * "Identifiers starting with "gl_" are reserved for use by
2733 * OpenGL, and may not be declared in a shader as either a
2734 * variable or a function."
2736 if (strncmp(identifier
, "gl_", 3) == 0) {
2737 _mesa_glsl_error(&loc
, state
,
2738 "identifier `%s' uses reserved `gl_' prefix",
2740 } else if (strstr(identifier
, "__")) {
2741 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2744 * "In addition, all identifiers containing two
2745 * consecutive underscores (__) are reserved as
2746 * possible future keywords."
2748 _mesa_glsl_error(&loc
, state
,
2749 "identifier `%s' uses reserved `__' string",
2756 ast_declarator_list::hir(exec_list
*instructions
,
2757 struct _mesa_glsl_parse_state
*state
)
2760 const struct glsl_type
*decl_type
;
2761 const char *type_name
= NULL
;
2762 ir_rvalue
*result
= NULL
;
2763 YYLTYPE loc
= this->get_location();
2765 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2767 * "To ensure that a particular output variable is invariant, it is
2768 * necessary to use the invariant qualifier. It can either be used to
2769 * qualify a previously declared variable as being invariant
2771 * invariant gl_Position; // make existing gl_Position be invariant"
2773 * In these cases the parser will set the 'invariant' flag in the declarator
2774 * list, and the type will be NULL.
2776 if (this->invariant
) {
2777 assert(this->type
== NULL
);
2779 if (state
->current_function
!= NULL
) {
2780 _mesa_glsl_error(& loc
, state
,
2781 "all uses of `invariant' keyword must be at global "
2785 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2786 assert(!decl
->is_array
);
2787 assert(decl
->array_size
== NULL
);
2788 assert(decl
->initializer
== NULL
);
2790 ir_variable
*const earlier
=
2791 state
->symbols
->get_variable(decl
->identifier
);
2792 if (earlier
== NULL
) {
2793 _mesa_glsl_error(& loc
, state
,
2794 "undeclared variable `%s' cannot be marked "
2795 "invariant", decl
->identifier
);
2796 } else if ((state
->target
== vertex_shader
)
2797 && (earlier
->mode
!= ir_var_shader_out
)) {
2798 _mesa_glsl_error(& loc
, state
,
2799 "`%s' cannot be marked invariant, vertex shader "
2800 "outputs only", decl
->identifier
);
2801 } else if ((state
->target
== fragment_shader
)
2802 && (earlier
->mode
!= ir_var_shader_in
)) {
2803 _mesa_glsl_error(& loc
, state
,
2804 "`%s' cannot be marked invariant, fragment shader "
2805 "inputs only", decl
->identifier
);
2806 } else if (earlier
->used
) {
2807 _mesa_glsl_error(& loc
, state
,
2808 "variable `%s' may not be redeclared "
2809 "`invariant' after being used",
2812 earlier
->invariant
= true;
2816 /* Invariant redeclarations do not have r-values.
2821 assert(this->type
!= NULL
);
2822 assert(!this->invariant
);
2824 /* The type specifier may contain a structure definition. Process that
2825 * before any of the variable declarations.
2827 (void) this->type
->specifier
->hir(instructions
, state
);
2829 decl_type
= this->type
->glsl_type(& type_name
, state
);
2830 if (this->declarations
.is_empty()) {
2831 /* If there is no structure involved in the program text, there are two
2832 * possible scenarios:
2834 * - The program text contained something like 'vec4;'. This is an
2835 * empty declaration. It is valid but weird. Emit a warning.
2837 * - The program text contained something like 'S;' and 'S' is not the
2838 * name of a known structure type. This is both invalid and weird.
2841 * - The program text contained something like 'mediump float;'
2842 * when the programmer probably meant 'precision mediump
2843 * float;' Emit a warning with a description of what they
2844 * probably meant to do.
2846 * Note that if decl_type is NULL and there is a structure involved,
2847 * there must have been some sort of error with the structure. In this
2848 * case we assume that an error was already generated on this line of
2849 * code for the structure. There is no need to generate an additional,
2852 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2855 if (decl_type
== NULL
) {
2856 _mesa_glsl_error(&loc
, state
,
2857 "invalid type `%s' in empty declaration",
2859 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
2860 if (this->type
->specifier
->structure
!= NULL
) {
2861 _mesa_glsl_error(&loc
, state
,
2862 "precision qualifiers can't be applied "
2865 static const char *const precision_names
[] = {
2872 _mesa_glsl_warning(&loc
, state
,
2873 "empty declaration with precision qualifier, "
2874 "to set the default precision, use "
2875 "`precision %s %s;'",
2876 precision_names
[this->type
->qualifier
.precision
],
2880 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2884 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2885 const struct glsl_type
*var_type
;
2888 /* FINISHME: Emit a warning if a variable declaration shadows a
2889 * FINISHME: declaration at a higher scope.
2892 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2893 if (type_name
!= NULL
) {
2894 _mesa_glsl_error(& loc
, state
,
2895 "invalid type `%s' in declaration of `%s'",
2896 type_name
, decl
->identifier
);
2898 _mesa_glsl_error(& loc
, state
,
2899 "invalid type in declaration of `%s'",
2905 if (decl
->is_array
) {
2906 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2908 if (var_type
->is_error())
2911 var_type
= decl_type
;
2914 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2916 /* The 'varying in' and 'varying out' qualifiers can only be used with
2917 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
2920 if (this->type
->qualifier
.flags
.q
.varying
) {
2921 if (this->type
->qualifier
.flags
.q
.in
) {
2922 _mesa_glsl_error(& loc
, state
,
2923 "`varying in' qualifier in declaration of "
2924 "`%s' only valid for geometry shaders using "
2925 "ARB_geometry_shader4 or EXT_geometry_shader4",
2927 } else if (this->type
->qualifier
.flags
.q
.out
) {
2928 _mesa_glsl_error(& loc
, state
,
2929 "`varying out' qualifier in declaration of "
2930 "`%s' only valid for geometry shaders using "
2931 "ARB_geometry_shader4 or EXT_geometry_shader4",
2936 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2938 * "Global variables can only use the qualifiers const,
2939 * attribute, uni form, or varying. Only one may be
2942 * Local variables can only use the qualifier const."
2944 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2945 * any extension that adds the 'layout' keyword.
2947 if (!state
->is_version(130, 300)
2948 && !state
->has_explicit_attrib_location()
2949 && !state
->ARB_fragment_coord_conventions_enable
) {
2950 if (this->type
->qualifier
.flags
.q
.out
) {
2951 _mesa_glsl_error(& loc
, state
,
2952 "`out' qualifier in declaration of `%s' "
2953 "only valid for function parameters in %s",
2954 decl
->identifier
, state
->get_version_string());
2956 if (this->type
->qualifier
.flags
.q
.in
) {
2957 _mesa_glsl_error(& loc
, state
,
2958 "`in' qualifier in declaration of `%s' "
2959 "only valid for function parameters in %s",
2960 decl
->identifier
, state
->get_version_string());
2962 /* FINISHME: Test for other invalid qualifiers. */
2965 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2968 if (this->type
->qualifier
.flags
.q
.invariant
) {
2969 if ((state
->target
== vertex_shader
) &&
2970 var
->mode
!= ir_var_shader_out
) {
2971 _mesa_glsl_error(& loc
, state
,
2972 "`%s' cannot be marked invariant, vertex shader "
2973 "outputs only", var
->name
);
2974 } else if ((state
->target
== fragment_shader
) &&
2975 var
->mode
!= ir_var_shader_in
) {
2976 /* FINISHME: Note that this doesn't work for invariant on
2977 * a function signature inval
2979 _mesa_glsl_error(& loc
, state
,
2980 "`%s' cannot be marked invariant, fragment shader "
2981 "inputs only", var
->name
);
2985 if (state
->current_function
!= NULL
) {
2986 const char *mode
= NULL
;
2987 const char *extra
= "";
2989 /* There is no need to check for 'inout' here because the parser will
2990 * only allow that in function parameter lists.
2992 if (this->type
->qualifier
.flags
.q
.attribute
) {
2994 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2996 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2998 } else if (this->type
->qualifier
.flags
.q
.in
) {
3000 extra
= " or in function parameter list";
3001 } else if (this->type
->qualifier
.flags
.q
.out
) {
3003 extra
= " or in function parameter list";
3007 _mesa_glsl_error(& loc
, state
,
3008 "%s variable `%s' must be declared at "
3010 mode
, var
->name
, extra
);
3012 } else if (var
->mode
== ir_var_shader_in
) {
3013 var
->read_only
= true;
3015 if (state
->target
== vertex_shader
) {
3016 bool error_emitted
= false;
3018 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
3020 * "Vertex shader inputs can only be float, floating-point
3021 * vectors, matrices, signed and unsigned integers and integer
3022 * vectors. Vertex shader inputs can also form arrays of these
3023 * types, but not structures."
3025 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
3027 * "Vertex shader inputs can only be float, floating-point
3028 * vectors, matrices, signed and unsigned integers and integer
3029 * vectors. They cannot be arrays or structures."
3031 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
3033 * "The attribute qualifier can be used only with float,
3034 * floating-point vectors, and matrices. Attribute variables
3035 * cannot be declared as arrays or structures."
3037 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
3039 * "Vertex shader inputs can only be float, floating-point
3040 * vectors, matrices, signed and unsigned integers and integer
3041 * vectors. Vertex shader inputs cannot be arrays or
3044 const glsl_type
*check_type
= var
->type
->is_array()
3045 ? var
->type
->fields
.array
: var
->type
;
3047 switch (check_type
->base_type
) {
3048 case GLSL_TYPE_FLOAT
:
3050 case GLSL_TYPE_UINT
:
3052 if (state
->is_version(120, 300))
3056 _mesa_glsl_error(& loc
, state
,
3057 "vertex shader input / attribute cannot have "
3059 var
->type
->is_array() ? "array of " : "",
3061 error_emitted
= true;
3064 if (!error_emitted
&& var
->type
->is_array() &&
3065 !state
->check_version(150, 0, &loc
,
3066 "vertex shader input / attribute "
3067 "cannot have array type")) {
3068 error_emitted
= true;
3070 } else if (state
->target
== geometry_shader
) {
3071 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3073 * Geometry shader input variables get the per-vertex values
3074 * written out by vertex shader output variables of the same
3075 * names. Since a geometry shader operates on a set of
3076 * vertices, each input varying variable (or input block, see
3077 * interface blocks below) needs to be declared as an array.
3079 if (!var
->type
->is_array()) {
3080 _mesa_glsl_error(&loc
, state
,
3081 "geometry shader inputs must be arrays");
3084 handle_geometry_shader_input_decl(state
, loc
, var
);
3088 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
3089 * so must integer vertex outputs.
3091 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
3092 * "Fragment shader inputs that are signed or unsigned integers or
3093 * integer vectors must be qualified with the interpolation qualifier
3096 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3097 * "Fragment shader inputs that are, or contain, signed or unsigned
3098 * integers or integer vectors must be qualified with the
3099 * interpolation qualifier flat."
3101 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3102 * "Vertex shader outputs that are, or contain, signed or unsigned
3103 * integers or integer vectors must be qualified with the
3104 * interpolation qualifier flat."
3106 * Note that prior to GLSL 1.50, this requirement applied to vertex
3107 * outputs rather than fragment inputs. That creates problems in the
3108 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3109 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3110 * apply the restriction to both vertex outputs and fragment inputs.
3112 * Note also that the desktop GLSL specs are missing the text "or
3113 * contain"; this is presumably an oversight, since there is no
3114 * reasonable way to interpolate a fragment shader input that contains
3117 if (state
->is_version(130, 300) &&
3118 var
->type
->contains_integer() &&
3119 var
->interpolation
!= INTERP_QUALIFIER_FLAT
&&
3120 ((state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)
3121 || (state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
3122 && state
->es_shader
))) {
3123 const char *var_type
= (state
->target
== vertex_shader
) ?
3124 "vertex output" : "fragment input";
3125 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
3126 "an integer, then it must be qualified with 'flat'",
3131 /* Interpolation qualifiers cannot be applied to 'centroid' and
3132 * 'centroid varying'.
3134 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3135 * "interpolation qualifiers may only precede the qualifiers in,
3136 * centroid in, out, or centroid out in a declaration. They do not apply
3137 * to the deprecated storage qualifiers varying or centroid varying."
3139 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3141 if (state
->is_version(130, 0)
3142 && this->type
->qualifier
.has_interpolation()
3143 && this->type
->qualifier
.flags
.q
.varying
) {
3145 const char *i
= this->type
->qualifier
.interpolation_string();
3148 if (this->type
->qualifier
.flags
.q
.centroid
)
3149 s
= "centroid varying";
3153 _mesa_glsl_error(&loc
, state
,
3154 "qualifier '%s' cannot be applied to the "
3155 "deprecated storage qualifier '%s'", i
, s
);
3159 /* Interpolation qualifiers can only apply to vertex shader outputs and
3160 * fragment shader inputs.
3162 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3163 * "Outputs from a vertex shader (out) and inputs to a fragment
3164 * shader (in) can be further qualified with one or more of these
3165 * interpolation qualifiers"
3167 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
3168 * "These interpolation qualifiers may only precede the qualifiers
3169 * in, centroid in, out, or centroid out in a declaration. They do
3170 * not apply to inputs into a vertex shader or outputs from a
3173 if (state
->is_version(130, 300)
3174 && this->type
->qualifier
.has_interpolation()) {
3176 const char *i
= this->type
->qualifier
.interpolation_string();
3179 switch (state
->target
) {
3181 if (this->type
->qualifier
.flags
.q
.in
) {
3182 _mesa_glsl_error(&loc
, state
,
3183 "qualifier '%s' cannot be applied to vertex "
3184 "shader inputs", i
);
3187 case fragment_shader
:
3188 if (this->type
->qualifier
.flags
.q
.out
) {
3189 _mesa_glsl_error(&loc
, state
,
3190 "qualifier '%s' cannot be applied to fragment "
3191 "shader outputs", i
);
3200 /* From section 4.3.4 of the GLSL 1.30 spec:
3201 * "It is an error to use centroid in in a vertex shader."
3203 * From section 4.3.4 of the GLSL ES 3.00 spec:
3204 * "It is an error to use centroid in or interpolation qualifiers in
3205 * a vertex shader input."
3207 if (state
->is_version(130, 300)
3208 && this->type
->qualifier
.flags
.q
.centroid
3209 && this->type
->qualifier
.flags
.q
.in
3210 && state
->target
== vertex_shader
) {
3212 _mesa_glsl_error(&loc
, state
,
3213 "'centroid in' cannot be used in a vertex shader");
3216 /* Section 4.3.6 of the GLSL 1.30 specification states:
3217 * "It is an error to use centroid out in a fragment shader."
3219 * The GL_ARB_shading_language_420pack extension specification states:
3220 * "It is an error to use auxiliary storage qualifiers or interpolation
3221 * qualifiers on an output in a fragment shader."
3223 if (state
->target
== fragment_shader
&&
3224 this->type
->qualifier
.flags
.q
.out
&&
3225 this->type
->qualifier
.has_auxiliary_storage()) {
3226 _mesa_glsl_error(&loc
, state
,
3227 "auxiliary storage qualifiers cannot be used on "
3228 "fragment shader outputs");
3231 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
3233 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3234 state
->check_precision_qualifiers_allowed(&loc
);
3238 /* Precision qualifiers apply to floating point, integer and sampler
3241 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3242 * "Any floating point or any integer declaration can have the type
3243 * preceded by one of these precision qualifiers [...] Literal
3244 * constants do not have precision qualifiers. Neither do Boolean
3247 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3250 * "Precision qualifiers are added for code portability with OpenGL
3251 * ES, not for functionality. They have the same syntax as in OpenGL
3254 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3256 * "uniform lowp sampler2D sampler;
3259 * lowp vec4 col = texture2D (sampler, coord);
3260 * // texture2D returns lowp"
3262 * From this, we infer that GLSL 1.30 (and later) should allow precision
3263 * qualifiers on sampler types just like float and integer types.
3265 if (this->type
->qualifier
.precision
!= ast_precision_none
3266 && !var
->type
->is_float()
3267 && !var
->type
->is_integer()
3268 && !var
->type
->is_record()
3269 && !var
->type
->is_sampler()
3270 && !(var
->type
->is_array()
3271 && (var
->type
->fields
.array
->is_float()
3272 || var
->type
->fields
.array
->is_integer()))) {
3274 _mesa_glsl_error(&loc
, state
,
3275 "precision qualifiers apply only to floating point"
3276 ", integer and sampler types");
3279 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3281 * "[Sampler types] can only be declared as function
3282 * parameters or uniform variables (see Section 4.3.5
3285 if (var_type
->contains_sampler() &&
3286 !this->type
->qualifier
.flags
.q
.uniform
) {
3287 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
3290 /* Process the initializer and add its instructions to a temporary
3291 * list. This list will be added to the instruction stream (below) after
3292 * the declaration is added. This is done because in some cases (such as
3293 * redeclarations) the declaration may not actually be added to the
3294 * instruction stream.
3296 exec_list initializer_instructions
;
3297 ir_variable
*earlier
=
3298 get_variable_being_redeclared(var
, decl
->get_location(), state
,
3299 false /* allow_all_redeclarations */);
3301 if (decl
->initializer
!= NULL
) {
3302 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3304 &initializer_instructions
, state
);
3307 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3309 * "It is an error to write to a const variable outside of
3310 * its declaration, so they must be initialized when
3313 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3314 _mesa_glsl_error(& loc
, state
,
3315 "const declaration of `%s' must be initialized",
3319 if (state
->es_shader
) {
3320 const glsl_type
*const t
= (earlier
== NULL
)
3321 ? var
->type
: earlier
->type
;
3323 if (t
->is_unsized_array())
3324 /* Section 10.17 of the GLSL ES 1.00 specification states that
3325 * unsized array declarations have been removed from the language.
3326 * Arrays that are sized using an initializer are still explicitly
3327 * sized. However, GLSL ES 1.00 does not allow array
3328 * initializers. That is only allowed in GLSL ES 3.00.
3330 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
3332 * "An array type can also be formed without specifying a size
3333 * if the definition includes an initializer:
3335 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
3336 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
3341 _mesa_glsl_error(& loc
, state
,
3342 "unsized array declarations are not allowed in "
3346 /* If the declaration is not a redeclaration, there are a few additional
3347 * semantic checks that must be applied. In addition, variable that was
3348 * created for the declaration should be added to the IR stream.
3350 if (earlier
== NULL
) {
3351 validate_identifier(decl
->identifier
, loc
, state
);
3353 /* Add the variable to the symbol table. Note that the initializer's
3354 * IR was already processed earlier (though it hasn't been emitted
3355 * yet), without the variable in scope.
3357 * This differs from most C-like languages, but it follows the GLSL
3358 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3361 * "Within a declaration, the scope of a name starts immediately
3362 * after the initializer if present or immediately after the name
3363 * being declared if not."
3365 if (!state
->symbols
->add_variable(var
)) {
3366 YYLTYPE loc
= this->get_location();
3367 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3368 "current scope", decl
->identifier
);
3372 /* Push the variable declaration to the top. It means that all the
3373 * variable declarations will appear in a funny last-to-first order,
3374 * but otherwise we run into trouble if a function is prototyped, a
3375 * global var is decled, then the function is defined with usage of
3376 * the global var. See glslparsertest's CorrectModule.frag.
3378 instructions
->push_head(var
);
3381 instructions
->append_list(&initializer_instructions
);
3385 /* Generally, variable declarations do not have r-values. However,
3386 * one is used for the declaration in
3388 * while (bool b = some_condition()) {
3392 * so we return the rvalue from the last seen declaration here.
3399 ast_parameter_declarator::hir(exec_list
*instructions
,
3400 struct _mesa_glsl_parse_state
*state
)
3403 const struct glsl_type
*type
;
3404 const char *name
= NULL
;
3405 YYLTYPE loc
= this->get_location();
3407 type
= this->type
->glsl_type(& name
, state
);
3411 _mesa_glsl_error(& loc
, state
,
3412 "invalid type `%s' in declaration of `%s'",
3413 name
, this->identifier
);
3415 _mesa_glsl_error(& loc
, state
,
3416 "invalid type in declaration of `%s'",
3420 type
= glsl_type::error_type
;
3423 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3425 * "Functions that accept no input arguments need not use void in the
3426 * argument list because prototypes (or definitions) are required and
3427 * therefore there is no ambiguity when an empty argument list "( )" is
3428 * declared. The idiom "(void)" as a parameter list is provided for
3431 * Placing this check here prevents a void parameter being set up
3432 * for a function, which avoids tripping up checks for main taking
3433 * parameters and lookups of an unnamed symbol.
3435 if (type
->is_void()) {
3436 if (this->identifier
!= NULL
)
3437 _mesa_glsl_error(& loc
, state
,
3438 "named parameter cannot have type `void'");
3444 if (formal_parameter
&& (this->identifier
== NULL
)) {
3445 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3449 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3450 * call already handled the "vec4[..] foo" case.
3452 if (this->is_array
) {
3453 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3456 if (!type
->is_error() && type
->is_unsized_array()) {
3457 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3459 type
= glsl_type::error_type
;
3463 ir_variable
*var
= new(ctx
)
3464 ir_variable(type
, this->identifier
, ir_var_function_in
);
3466 /* Apply any specified qualifiers to the parameter declaration. Note that
3467 * for function parameters the default mode is 'in'.
3469 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3472 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3474 * "Samplers cannot be treated as l-values; hence cannot be used
3475 * as out or inout function parameters, nor can they be assigned
3478 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3479 && type
->contains_sampler()) {
3480 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3481 type
= glsl_type::error_type
;
3484 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3486 * "When calling a function, expressions that do not evaluate to
3487 * l-values cannot be passed to parameters declared as out or inout."
3489 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3491 * "Other binary or unary expressions, non-dereferenced arrays,
3492 * function names, swizzles with repeated fields, and constants
3493 * cannot be l-values."
3495 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3496 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3498 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3500 && !state
->check_version(120, 100, &loc
,
3501 "arrays cannot be out or inout parameters")) {
3502 type
= glsl_type::error_type
;
3505 instructions
->push_tail(var
);
3507 /* Parameter declarations do not have r-values.
3514 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3516 exec_list
*ir_parameters
,
3517 _mesa_glsl_parse_state
*state
)
3519 ast_parameter_declarator
*void_param
= NULL
;
3522 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3523 param
->formal_parameter
= formal
;
3524 param
->hir(ir_parameters
, state
);
3532 if ((void_param
!= NULL
) && (count
> 1)) {
3533 YYLTYPE loc
= void_param
->get_location();
3535 _mesa_glsl_error(& loc
, state
,
3536 "`void' parameter must be only parameter");
3542 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3544 /* IR invariants disallow function declarations or definitions
3545 * nested within other function definitions. But there is no
3546 * requirement about the relative order of function declarations
3547 * and definitions with respect to one another. So simply insert
3548 * the new ir_function block at the end of the toplevel instruction
3551 state
->toplevel_ir
->push_tail(f
);
3556 ast_function::hir(exec_list
*instructions
,
3557 struct _mesa_glsl_parse_state
*state
)
3560 ir_function
*f
= NULL
;
3561 ir_function_signature
*sig
= NULL
;
3562 exec_list hir_parameters
;
3564 const char *const name
= identifier
;
3566 /* New functions are always added to the top-level IR instruction stream,
3567 * so this instruction list pointer is ignored. See also emit_function
3570 (void) instructions
;
3572 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3574 * "Function declarations (prototypes) cannot occur inside of functions;
3575 * they must be at global scope, or for the built-in functions, outside
3576 * the global scope."
3578 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3580 * "User defined functions may only be defined within the global scope."
3582 * Note that this language does not appear in GLSL 1.10.
3584 if ((state
->current_function
!= NULL
) &&
3585 state
->is_version(120, 100)) {
3586 YYLTYPE loc
= this->get_location();
3587 _mesa_glsl_error(&loc
, state
,
3588 "declaration of function `%s' not allowed within "
3589 "function body", name
);
3592 validate_identifier(name
, this->get_location(), state
);
3594 /* Convert the list of function parameters to HIR now so that they can be
3595 * used below to compare this function's signature with previously seen
3596 * signatures for functions with the same name.
3598 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3600 & hir_parameters
, state
);
3602 const char *return_type_name
;
3603 const glsl_type
*return_type
=
3604 this->return_type
->glsl_type(& return_type_name
, state
);
3607 YYLTYPE loc
= this->get_location();
3608 _mesa_glsl_error(&loc
, state
,
3609 "function `%s' has undeclared return type `%s'",
3610 name
, return_type_name
);
3611 return_type
= glsl_type::error_type
;
3614 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3615 * "No qualifier is allowed on the return type of a function."
3617 if (this->return_type
->has_qualifiers()) {
3618 YYLTYPE loc
= this->get_location();
3619 _mesa_glsl_error(& loc
, state
,
3620 "function `%s' return type has qualifiers", name
);
3623 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
3625 * "Arrays are allowed as arguments and as the return type. In both
3626 * cases, the array must be explicitly sized."
3628 if (return_type
->is_unsized_array()) {
3629 YYLTYPE loc
= this->get_location();
3630 _mesa_glsl_error(& loc
, state
,
3631 "function `%s' return type array must be explicitly "
3635 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3637 * "[Sampler types] can only be declared as function parameters
3638 * or uniform variables (see Section 4.3.5 "Uniform")".
3640 if (return_type
->contains_sampler()) {
3641 YYLTYPE loc
= this->get_location();
3642 _mesa_glsl_error(&loc
, state
,
3643 "function `%s' return type can't contain a sampler",
3647 /* Verify that this function's signature either doesn't match a previously
3648 * seen signature for a function with the same name, or, if a match is found,
3649 * that the previously seen signature does not have an associated definition.
3651 f
= state
->symbols
->get_function(name
);
3652 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3653 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
3655 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3656 if (badvar
!= NULL
) {
3657 YYLTYPE loc
= this->get_location();
3659 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3660 "qualifiers don't match prototype", name
, badvar
);
3663 if (sig
->return_type
!= return_type
) {
3664 YYLTYPE loc
= this->get_location();
3666 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3667 "match prototype", name
);
3670 if (sig
->is_defined
) {
3671 if (is_definition
) {
3672 YYLTYPE loc
= this->get_location();
3673 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3675 /* We just encountered a prototype that exactly matches a
3676 * function that's already been defined. This is redundant,
3677 * and we should ignore it.
3684 f
= new(ctx
) ir_function(name
);
3685 if (!state
->symbols
->add_function(f
)) {
3686 /* This function name shadows a non-function use of the same name. */
3687 YYLTYPE loc
= this->get_location();
3689 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3690 "non-function", name
);
3694 emit_function(state
, f
);
3697 /* Verify the return type of main() */
3698 if (strcmp(name
, "main") == 0) {
3699 if (! return_type
->is_void()) {
3700 YYLTYPE loc
= this->get_location();
3702 _mesa_glsl_error(& loc
, state
, "main() must return void");
3705 if (!hir_parameters
.is_empty()) {
3706 YYLTYPE loc
= this->get_location();
3708 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3712 /* Finish storing the information about this new function in its signature.
3715 sig
= new(ctx
) ir_function_signature(return_type
);
3716 f
->add_signature(sig
);
3719 sig
->replace_parameters(&hir_parameters
);
3722 /* Function declarations (prototypes) do not have r-values.
3729 ast_function_definition::hir(exec_list
*instructions
,
3730 struct _mesa_glsl_parse_state
*state
)
3732 prototype
->is_definition
= true;
3733 prototype
->hir(instructions
, state
);
3735 ir_function_signature
*signature
= prototype
->signature
;
3736 if (signature
== NULL
)
3739 assert(state
->current_function
== NULL
);
3740 state
->current_function
= signature
;
3741 state
->found_return
= false;
3743 /* Duplicate parameters declared in the prototype as concrete variables.
3744 * Add these to the symbol table.
3746 state
->symbols
->push_scope();
3747 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3748 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3750 assert(var
!= NULL
);
3752 /* The only way a parameter would "exist" is if two parameters have
3755 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3756 YYLTYPE loc
= this->get_location();
3758 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3760 state
->symbols
->add_variable(var
);
3764 /* Convert the body of the function to HIR. */
3765 this->body
->hir(&signature
->body
, state
);
3766 signature
->is_defined
= true;
3768 state
->symbols
->pop_scope();
3770 assert(state
->current_function
== signature
);
3771 state
->current_function
= NULL
;
3773 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3774 YYLTYPE loc
= this->get_location();
3775 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3776 "%s, but no return statement",
3777 signature
->function_name(),
3778 signature
->return_type
->name
);
3781 /* Function definitions do not have r-values.
3788 ast_jump_statement::hir(exec_list
*instructions
,
3789 struct _mesa_glsl_parse_state
*state
)
3796 assert(state
->current_function
);
3798 if (opt_return_value
) {
3799 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
3801 /* The value of the return type can be NULL if the shader says
3802 * 'return foo();' and foo() is a function that returns void.
3804 * NOTE: The GLSL spec doesn't say that this is an error. The type
3805 * of the return value is void. If the return type of the function is
3806 * also void, then this should compile without error. Seriously.
3808 const glsl_type
*const ret_type
=
3809 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3811 /* Implicit conversions are not allowed for return values prior to
3812 * ARB_shading_language_420pack.
3814 if (state
->current_function
->return_type
!= ret_type
) {
3815 YYLTYPE loc
= this->get_location();
3817 if (state
->ARB_shading_language_420pack_enable
) {
3818 if (!apply_implicit_conversion(state
->current_function
->return_type
,
3820 _mesa_glsl_error(& loc
, state
,
3821 "could not implicitly convert return value "
3822 "to %s, in function `%s'",
3823 state
->current_function
->return_type
->name
,
3824 state
->current_function
->function_name());
3827 _mesa_glsl_error(& loc
, state
,
3828 "`return' with wrong type %s, in function `%s' "
3831 state
->current_function
->function_name(),
3832 state
->current_function
->return_type
->name
);
3834 } else if (state
->current_function
->return_type
->base_type
==
3836 YYLTYPE loc
= this->get_location();
3838 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
3839 * specs add a clarification:
3841 * "A void function can only use return without a return argument, even if
3842 * the return argument has void type. Return statements only accept values:
3845 * void func2() { return func1(); } // illegal return statement"
3847 _mesa_glsl_error(& loc
, state
,
3848 "void functions can only use `return' without a "
3852 inst
= new(ctx
) ir_return(ret
);
3854 if (state
->current_function
->return_type
->base_type
!=
3856 YYLTYPE loc
= this->get_location();
3858 _mesa_glsl_error(& loc
, state
,
3859 "`return' with no value, in function %s returning "
3861 state
->current_function
->function_name());
3863 inst
= new(ctx
) ir_return
;
3866 state
->found_return
= true;
3867 instructions
->push_tail(inst
);
3872 if (state
->target
!= fragment_shader
) {
3873 YYLTYPE loc
= this->get_location();
3875 _mesa_glsl_error(& loc
, state
,
3876 "`discard' may only appear in a fragment shader");
3878 instructions
->push_tail(new(ctx
) ir_discard
);
3883 if (mode
== ast_continue
&&
3884 state
->loop_nesting_ast
== NULL
) {
3885 YYLTYPE loc
= this->get_location();
3887 _mesa_glsl_error(& loc
, state
,
3888 "continue may only appear in a loop");
3889 } else if (mode
== ast_break
&&
3890 state
->loop_nesting_ast
== NULL
&&
3891 state
->switch_state
.switch_nesting_ast
== NULL
) {
3892 YYLTYPE loc
= this->get_location();
3894 _mesa_glsl_error(& loc
, state
,
3895 "break may only appear in a loop or a switch");
3897 /* For a loop, inline the for loop expression again,
3898 * since we don't know where near the end of
3899 * the loop body the normal copy of it
3900 * is going to be placed.
3902 if (state
->loop_nesting_ast
!= NULL
&&
3903 mode
== ast_continue
&&
3904 state
->loop_nesting_ast
->rest_expression
) {
3905 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3909 if (state
->switch_state
.is_switch_innermost
&&
3910 mode
== ast_break
) {
3911 /* Force break out of switch by setting is_break switch state.
3913 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3914 ir_dereference_variable
*const deref_is_break_var
=
3915 new(ctx
) ir_dereference_variable(is_break_var
);
3916 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3917 ir_assignment
*const set_break_var
=
3918 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3920 instructions
->push_tail(set_break_var
);
3923 ir_loop_jump
*const jump
=
3924 new(ctx
) ir_loop_jump((mode
== ast_break
)
3925 ? ir_loop_jump::jump_break
3926 : ir_loop_jump::jump_continue
);
3927 instructions
->push_tail(jump
);
3934 /* Jump instructions do not have r-values.
3941 ast_selection_statement::hir(exec_list
*instructions
,
3942 struct _mesa_glsl_parse_state
*state
)
3946 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3948 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3950 * "Any expression whose type evaluates to a Boolean can be used as the
3951 * conditional expression bool-expression. Vector types are not accepted
3952 * as the expression to if."
3954 * The checks are separated so that higher quality diagnostics can be
3955 * generated for cases where both rules are violated.
3957 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3958 YYLTYPE loc
= this->condition
->get_location();
3960 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3964 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3966 if (then_statement
!= NULL
) {
3967 state
->symbols
->push_scope();
3968 then_statement
->hir(& stmt
->then_instructions
, state
);
3969 state
->symbols
->pop_scope();
3972 if (else_statement
!= NULL
) {
3973 state
->symbols
->push_scope();
3974 else_statement
->hir(& stmt
->else_instructions
, state
);
3975 state
->symbols
->pop_scope();
3978 instructions
->push_tail(stmt
);
3980 /* if-statements do not have r-values.
3987 ast_switch_statement::hir(exec_list
*instructions
,
3988 struct _mesa_glsl_parse_state
*state
)
3992 ir_rvalue
*const test_expression
=
3993 this->test_expression
->hir(instructions
, state
);
3995 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3997 * "The type of init-expression in a switch statement must be a
4000 if (!test_expression
->type
->is_scalar() ||
4001 !test_expression
->type
->is_integer()) {
4002 YYLTYPE loc
= this->test_expression
->get_location();
4004 _mesa_glsl_error(& loc
,
4006 "switch-statement expression must be scalar "
4010 /* Track the switch-statement nesting in a stack-like manner.
4012 struct glsl_switch_state saved
= state
->switch_state
;
4014 state
->switch_state
.is_switch_innermost
= true;
4015 state
->switch_state
.switch_nesting_ast
= this;
4016 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
4017 hash_table_pointer_compare
);
4018 state
->switch_state
.previous_default
= NULL
;
4020 /* Initalize is_fallthru state to false.
4022 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
4023 state
->switch_state
.is_fallthru_var
=
4024 new(ctx
) ir_variable(glsl_type::bool_type
,
4025 "switch_is_fallthru_tmp",
4027 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
4029 ir_dereference_variable
*deref_is_fallthru_var
=
4030 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4031 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
4034 /* Initalize is_break state to false.
4036 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
4037 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
4038 "switch_is_break_tmp",
4040 instructions
->push_tail(state
->switch_state
.is_break_var
);
4042 ir_dereference_variable
*deref_is_break_var
=
4043 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4044 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
4047 /* Cache test expression.
4049 test_to_hir(instructions
, state
);
4051 /* Emit code for body of switch stmt.
4053 body
->hir(instructions
, state
);
4055 hash_table_dtor(state
->switch_state
.labels_ht
);
4057 state
->switch_state
= saved
;
4059 /* Switch statements do not have r-values. */
4065 ast_switch_statement::test_to_hir(exec_list
*instructions
,
4066 struct _mesa_glsl_parse_state
*state
)
4070 /* Cache value of test expression. */
4071 ir_rvalue
*const test_val
=
4072 test_expression
->hir(instructions
,
4075 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
4078 ir_dereference_variable
*deref_test_var
=
4079 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4081 instructions
->push_tail(state
->switch_state
.test_var
);
4082 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
4087 ast_switch_body::hir(exec_list
*instructions
,
4088 struct _mesa_glsl_parse_state
*state
)
4091 stmts
->hir(instructions
, state
);
4093 /* Switch bodies do not have r-values. */
4098 ast_case_statement_list::hir(exec_list
*instructions
,
4099 struct _mesa_glsl_parse_state
*state
)
4101 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
4102 case_stmt
->hir(instructions
, state
);
4104 /* Case statements do not have r-values. */
4109 ast_case_statement::hir(exec_list
*instructions
,
4110 struct _mesa_glsl_parse_state
*state
)
4112 labels
->hir(instructions
, state
);
4114 /* Conditionally set fallthru state based on break state. */
4115 ir_constant
*const false_val
= new(state
) ir_constant(false);
4116 ir_dereference_variable
*const deref_is_fallthru_var
=
4117 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4118 ir_dereference_variable
*const deref_is_break_var
=
4119 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4120 ir_assignment
*const reset_fallthru_on_break
=
4121 new(state
) ir_assignment(deref_is_fallthru_var
,
4123 deref_is_break_var
);
4124 instructions
->push_tail(reset_fallthru_on_break
);
4126 /* Guard case statements depending on fallthru state. */
4127 ir_dereference_variable
*const deref_fallthru_guard
=
4128 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4129 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
4131 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
4132 stmt
->hir(& test_fallthru
->then_instructions
, state
);
4134 instructions
->push_tail(test_fallthru
);
4136 /* Case statements do not have r-values. */
4142 ast_case_label_list::hir(exec_list
*instructions
,
4143 struct _mesa_glsl_parse_state
*state
)
4145 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
4146 label
->hir(instructions
, state
);
4148 /* Case labels do not have r-values. */
4153 ast_case_label::hir(exec_list
*instructions
,
4154 struct _mesa_glsl_parse_state
*state
)
4158 ir_dereference_variable
*deref_fallthru_var
=
4159 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4161 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
4163 /* If not default case, ... */
4164 if (this->test_value
!= NULL
) {
4165 /* Conditionally set fallthru state based on
4166 * comparison of cached test expression value to case label.
4168 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
4169 ir_constant
*label_const
= label_rval
->constant_expression_value();
4172 YYLTYPE loc
= this->test_value
->get_location();
4174 _mesa_glsl_error(& loc
, state
,
4175 "switch statement case label must be a "
4176 "constant expression");
4178 /* Stuff a dummy value in to allow processing to continue. */
4179 label_const
= new(ctx
) ir_constant(0);
4181 ast_expression
*previous_label
= (ast_expression
*)
4182 hash_table_find(state
->switch_state
.labels_ht
,
4183 (void *)(uintptr_t)label_const
->value
.u
[0]);
4185 if (previous_label
) {
4186 YYLTYPE loc
= this->test_value
->get_location();
4187 _mesa_glsl_error(& loc
, state
,
4188 "duplicate case value");
4190 loc
= previous_label
->get_location();
4191 _mesa_glsl_error(& loc
, state
,
4192 "this is the previous case label");
4194 hash_table_insert(state
->switch_state
.labels_ht
,
4196 (void *)(uintptr_t)label_const
->value
.u
[0]);
4200 ir_dereference_variable
*deref_test_var
=
4201 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4203 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4207 ir_assignment
*set_fallthru_on_test
=
4208 new(ctx
) ir_assignment(deref_fallthru_var
,
4212 instructions
->push_tail(set_fallthru_on_test
);
4213 } else { /* default case */
4214 if (state
->switch_state
.previous_default
) {
4215 YYLTYPE loc
= this->get_location();
4216 _mesa_glsl_error(& loc
, state
,
4217 "multiple default labels in one switch");
4219 loc
= state
->switch_state
.previous_default
->get_location();
4220 _mesa_glsl_error(& loc
, state
,
4221 "this is the first default label");
4223 state
->switch_state
.previous_default
= this;
4225 /* Set falltrhu state. */
4226 ir_assignment
*set_fallthru
=
4227 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
4229 instructions
->push_tail(set_fallthru
);
4232 /* Case statements do not have r-values. */
4237 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
4238 struct _mesa_glsl_parse_state
*state
)
4242 if (condition
!= NULL
) {
4243 ir_rvalue
*const cond
=
4244 condition
->hir(& stmt
->body_instructions
, state
);
4247 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
4248 YYLTYPE loc
= condition
->get_location();
4250 _mesa_glsl_error(& loc
, state
,
4251 "loop condition must be scalar boolean");
4253 /* As the first code in the loop body, generate a block that looks
4254 * like 'if (!condition) break;' as the loop termination condition.
4256 ir_rvalue
*const not_cond
=
4257 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
4259 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
4261 ir_jump
*const break_stmt
=
4262 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4264 if_stmt
->then_instructions
.push_tail(break_stmt
);
4265 stmt
->body_instructions
.push_tail(if_stmt
);
4272 ast_iteration_statement::hir(exec_list
*instructions
,
4273 struct _mesa_glsl_parse_state
*state
)
4277 /* For-loops and while-loops start a new scope, but do-while loops do not.
4279 if (mode
!= ast_do_while
)
4280 state
->symbols
->push_scope();
4282 if (init_statement
!= NULL
)
4283 init_statement
->hir(instructions
, state
);
4285 ir_loop
*const stmt
= new(ctx
) ir_loop();
4286 instructions
->push_tail(stmt
);
4288 /* Track the current loop nesting. */
4289 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
4291 state
->loop_nesting_ast
= this;
4293 /* Likewise, indicate that following code is closest to a loop,
4294 * NOT closest to a switch.
4296 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
4297 state
->switch_state
.is_switch_innermost
= false;
4299 if (mode
!= ast_do_while
)
4300 condition_to_hir(stmt
, state
);
4303 body
->hir(& stmt
->body_instructions
, state
);
4305 if (rest_expression
!= NULL
)
4306 rest_expression
->hir(& stmt
->body_instructions
, state
);
4308 if (mode
== ast_do_while
)
4309 condition_to_hir(stmt
, state
);
4311 if (mode
!= ast_do_while
)
4312 state
->symbols
->pop_scope();
4314 /* Restore previous nesting before returning. */
4315 state
->loop_nesting_ast
= nesting_ast
;
4316 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
4318 /* Loops do not have r-values.
4325 * Determine if the given type is valid for establishing a default precision
4328 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
4330 * "The precision statement
4332 * precision precision-qualifier type;
4334 * can be used to establish a default precision qualifier. The type field
4335 * can be either int or float or any of the sampler types, and the
4336 * precision-qualifier can be lowp, mediump, or highp."
4338 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4339 * qualifiers on sampler types, but this seems like an oversight (since the
4340 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4341 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4345 is_valid_default_precision_type(const struct glsl_type
*const type
)
4350 switch (type
->base_type
) {
4352 case GLSL_TYPE_FLOAT
:
4353 /* "int" and "float" are valid, but vectors and matrices are not. */
4354 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
4355 case GLSL_TYPE_SAMPLER
:
4364 ast_type_specifier::hir(exec_list
*instructions
,
4365 struct _mesa_glsl_parse_state
*state
)
4367 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
4370 YYLTYPE loc
= this->get_location();
4372 /* If this is a precision statement, check that the type to which it is
4373 * applied is either float or int.
4375 * From section 4.5.3 of the GLSL 1.30 spec:
4376 * "The precision statement
4377 * precision precision-qualifier type;
4378 * can be used to establish a default precision qualifier. The type
4379 * field can be either int or float [...]. Any other types or
4380 * qualifiers will result in an error.
4382 if (this->default_precision
!= ast_precision_none
) {
4383 if (!state
->check_precision_qualifiers_allowed(&loc
))
4386 if (this->structure
!= NULL
) {
4387 _mesa_glsl_error(&loc
, state
,
4388 "precision qualifiers do not apply to structures");
4392 if (this->is_array
) {
4393 _mesa_glsl_error(&loc
, state
,
4394 "default precision statements do not apply to "
4399 const struct glsl_type
*const type
=
4400 state
->symbols
->get_type(this->type_name
);
4401 if (!is_valid_default_precision_type(type
)) {
4402 _mesa_glsl_error(&loc
, state
,
4403 "default precision statements apply only to "
4404 "float, int, and sampler types");
4408 if (type
->base_type
== GLSL_TYPE_FLOAT
4410 && state
->target
== fragment_shader
) {
4411 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
4414 * "The fragment language has no default precision qualifier for
4415 * floating point types."
4417 * As a result, we have to track whether or not default precision has
4418 * been specified for float in GLSL ES fragment shaders.
4420 * Earlier in that same section, the spec says:
4422 * "Non-precision qualified declarations will use the precision
4423 * qualifier specified in the most recent precision statement
4424 * that is still in scope. The precision statement has the same
4425 * scoping rules as variable declarations. If it is declared
4426 * inside a compound statement, its effect stops at the end of
4427 * the innermost statement it was declared in. Precision
4428 * statements in nested scopes override precision statements in
4429 * outer scopes. Multiple precision statements for the same basic
4430 * type can appear inside the same scope, with later statements
4431 * overriding earlier statements within that scope."
4433 * Default precision specifications follow the same scope rules as
4434 * variables. So, we can track the state of the default float
4435 * precision in the symbol table, and the rules will just work. This
4436 * is a slight abuse of the symbol table, but it has the semantics
4439 ir_variable
*const junk
=
4440 new(state
) ir_variable(type
, "#default precision",
4443 state
->symbols
->add_variable(junk
);
4446 /* FINISHME: Translate precision statements into IR. */
4450 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
4451 * process_record_constructor() can do type-checking on C-style initializer
4452 * expressions of structs, but ast_struct_specifier should only be translated
4453 * to HIR if it is declaring the type of a structure.
4455 * The ->is_declaration field is false for initializers of variables
4456 * declared separately from the struct's type definition.
4458 * struct S { ... }; (is_declaration = true)
4459 * struct T { ... } t = { ... }; (is_declaration = true)
4460 * S s = { ... }; (is_declaration = false)
4462 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
4463 return this->structure
->hir(instructions
, state
);
4470 * Process a structure or interface block tree into an array of structure fields
4472 * After parsing, where there are some syntax differnces, structures and
4473 * interface blocks are almost identical. They are similar enough that the
4474 * AST for each can be processed the same way into a set of
4475 * \c glsl_struct_field to describe the members.
4477 * If we're processing an interface block, var_mode should be the type of the
4478 * interface block (ir_var_shader_in, ir_var_shader_out, or ir_var_uniform).
4479 * If we're processing a structure, var_mode should be ir_var_auto.
4482 * The number of fields processed. A pointer to the array structure fields is
4483 * stored in \c *fields_ret.
4486 ast_process_structure_or_interface_block(exec_list
*instructions
,
4487 struct _mesa_glsl_parse_state
*state
,
4488 exec_list
*declarations
,
4490 glsl_struct_field
**fields_ret
,
4492 bool block_row_major
,
4493 bool allow_reserved_names
,
4494 ir_variable_mode var_mode
)
4496 unsigned decl_count
= 0;
4498 /* Make an initial pass over the list of fields to determine how
4499 * many there are. Each element in this list is an ast_declarator_list.
4500 * This means that we actually need to count the number of elements in the
4501 * 'declarations' list in each of the elements.
4503 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4504 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4509 /* Allocate storage for the fields and process the field
4510 * declarations. As the declarations are processed, try to also convert
4511 * the types to HIR. This ensures that structure definitions embedded in
4512 * other structure definitions or in interface blocks are processed.
4514 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4518 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4519 const char *type_name
;
4521 decl_list
->type
->specifier
->hir(instructions
, state
);
4523 /* Section 10.9 of the GLSL ES 1.00 specification states that
4524 * embedded structure definitions have been removed from the language.
4526 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4527 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
4528 "not allowed in GLSL ES 1.00");
4531 const glsl_type
*decl_type
=
4532 decl_list
->type
->glsl_type(& type_name
, state
);
4534 foreach_list_typed (ast_declaration
, decl
, link
,
4535 &decl_list
->declarations
) {
4536 if (!allow_reserved_names
)
4537 validate_identifier(decl
->identifier
, loc
, state
);
4539 /* From the GL_ARB_uniform_buffer_object spec:
4541 * "Sampler types are not allowed inside of uniform
4542 * blocks. All other types, arrays, and structures
4543 * allowed for uniforms are allowed within a uniform
4546 * It should be impossible for decl_type to be NULL here. Cases that
4547 * might naturally lead to decl_type being NULL, especially for the
4548 * is_interface case, will have resulted in compilation having
4549 * already halted due to a syntax error.
4551 const struct glsl_type
*field_type
=
4552 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
4554 if (is_interface
&& field_type
->contains_sampler()) {
4555 YYLTYPE loc
= decl_list
->get_location();
4556 _mesa_glsl_error(&loc
, state
,
4557 "uniform in non-default uniform block contains sampler");
4560 const struct ast_type_qualifier
*const qual
=
4561 & decl_list
->type
->qualifier
;
4562 if (qual
->flags
.q
.std140
||
4563 qual
->flags
.q
.packed
||
4564 qual
->flags
.q
.shared
) {
4565 _mesa_glsl_error(&loc
, state
,
4566 "uniform block layout qualifiers std140, packed, and "
4567 "shared can only be applied to uniform blocks, not "
4571 if (decl
->is_array
) {
4572 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4575 fields
[i
].type
= field_type
;
4576 fields
[i
].name
= decl
->identifier
;
4577 fields
[i
].location
= -1;
4578 fields
[i
].interpolation
=
4579 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
4580 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
4582 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4583 if (!qual
->flags
.q
.uniform
) {
4584 _mesa_glsl_error(&loc
, state
,
4585 "row_major and column_major can only be "
4586 "applied to uniform interface blocks");
4588 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
4591 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
4592 _mesa_glsl_error(&loc
, state
,
4593 "interpolation qualifiers cannot be used "
4594 "with uniform interface blocks");
4597 if (field_type
->is_matrix() ||
4598 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4599 fields
[i
].row_major
= block_row_major
;
4600 if (qual
->flags
.q
.row_major
)
4601 fields
[i
].row_major
= true;
4602 else if (qual
->flags
.q
.column_major
)
4603 fields
[i
].row_major
= false;
4610 assert(i
== decl_count
);
4612 *fields_ret
= fields
;
4618 ast_struct_specifier::hir(exec_list
*instructions
,
4619 struct _mesa_glsl_parse_state
*state
)
4621 YYLTYPE loc
= this->get_location();
4623 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
4625 * "Anonymous structures are not supported; so embedded structures must
4626 * have a declarator. A name given to an embedded struct is scoped at
4627 * the same level as the struct it is embedded in."
4629 * The same section of the GLSL 1.20 spec says:
4631 * "Anonymous structures are not supported. Embedded structures are not
4634 * struct S { float f; };
4636 * S; // Error: anonymous structures disallowed
4637 * struct { ... }; // Error: embedded structures disallowed
4638 * S s; // Okay: nested structures with name are allowed
4641 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
4642 * we allow embedded structures in 1.10 only.
4644 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
4645 _mesa_glsl_error(&loc
, state
,
4646 "embedded structure declartions are not allowed");
4648 state
->struct_specifier_depth
++;
4650 glsl_struct_field
*fields
;
4651 unsigned decl_count
=
4652 ast_process_structure_or_interface_block(instructions
,
4654 &this->declarations
,
4659 false /* allow_reserved_names */,
4662 validate_identifier(this->name
, loc
, state
);
4664 const glsl_type
*t
=
4665 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4667 if (!state
->symbols
->add_type(name
, t
)) {
4668 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4670 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4672 state
->num_user_structures
+ 1);
4674 s
[state
->num_user_structures
] = t
;
4675 state
->user_structures
= s
;
4676 state
->num_user_structures
++;
4680 state
->struct_specifier_depth
--;
4682 /* Structure type definitions do not have r-values.
4689 * Visitor class which detects whether a given interface block has been used.
4691 class interface_block_usage_visitor
: public ir_hierarchical_visitor
4694 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
4695 : mode(mode
), block(block
), found(false)
4699 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
4701 if (ir
->var
->mode
== mode
&& ir
->var
->get_interface_type() == block
) {
4705 return visit_continue
;
4708 bool usage_found() const
4714 ir_variable_mode mode
;
4715 const glsl_type
*block
;
4721 ast_interface_block::hir(exec_list
*instructions
,
4722 struct _mesa_glsl_parse_state
*state
)
4724 YYLTYPE loc
= this->get_location();
4726 /* The ast_interface_block has a list of ast_declarator_lists. We
4727 * need to turn those into ir_variables with an association
4728 * with this uniform block.
4730 enum glsl_interface_packing packing
;
4731 if (this->layout
.flags
.q
.shared
) {
4732 packing
= GLSL_INTERFACE_PACKING_SHARED
;
4733 } else if (this->layout
.flags
.q
.packed
) {
4734 packing
= GLSL_INTERFACE_PACKING_PACKED
;
4736 /* The default layout is std140.
4738 packing
= GLSL_INTERFACE_PACKING_STD140
;
4741 ir_variable_mode var_mode
;
4742 const char *iface_type_name
;
4743 if (this->layout
.flags
.q
.in
) {
4744 var_mode
= ir_var_shader_in
;
4745 iface_type_name
= "in";
4746 } else if (this->layout
.flags
.q
.out
) {
4747 var_mode
= ir_var_shader_out
;
4748 iface_type_name
= "out";
4749 } else if (this->layout
.flags
.q
.uniform
) {
4750 var_mode
= ir_var_uniform
;
4751 iface_type_name
= "uniform";
4753 var_mode
= ir_var_auto
;
4754 iface_type_name
= "UNKNOWN";
4755 assert(!"interface block layout qualifier not found!");
4758 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
4759 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4760 exec_list declared_variables
;
4761 glsl_struct_field
*fields
;
4762 unsigned int num_variables
=
4763 ast_process_structure_or_interface_block(&declared_variables
,
4765 &this->declarations
,
4770 redeclaring_per_vertex
,
4773 if (!redeclaring_per_vertex
)
4774 validate_identifier(this->block_name
, loc
, state
);
4776 const glsl_type
*earlier_per_vertex
= NULL
;
4777 if (redeclaring_per_vertex
) {
4778 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
4779 * the named interface block gl_in, we can find it by looking at the
4780 * previous declaration of gl_in. Otherwise we can find it by looking
4781 * at the previous decalartion of any of the built-in outputs,
4784 * Also check that the instance name and array-ness of the redeclaration
4788 case ir_var_shader_in
:
4789 if (ir_variable
*earlier_gl_in
=
4790 state
->symbols
->get_variable("gl_in")) {
4791 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
4793 _mesa_glsl_error(&loc
, state
,
4794 "redeclaration of gl_PerVertex input not allowed "
4796 _mesa_glsl_shader_target_name(state
->target
));
4798 if (this->instance_name
== NULL
||
4799 strcmp(this->instance_name
, "gl_in") != 0 || !this->is_array
) {
4800 _mesa_glsl_error(&loc
, state
,
4801 "gl_PerVertex input must be redeclared as "
4805 case ir_var_shader_out
:
4806 if (ir_variable
*earlier_gl_Position
=
4807 state
->symbols
->get_variable("gl_Position")) {
4808 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
4810 _mesa_glsl_error(&loc
, state
,
4811 "redeclaration of gl_PerVertex output not "
4812 "allowed in the %s shader",
4813 _mesa_glsl_shader_target_name(state
->target
));
4815 if (this->instance_name
!= NULL
) {
4816 _mesa_glsl_error(&loc
, state
,
4817 "gl_PerVertex input may not be redeclared with "
4818 "an instance name");
4822 _mesa_glsl_error(&loc
, state
,
4823 "gl_PerVertex must be declared as an input or an "
4828 if (earlier_per_vertex
== NULL
) {
4829 /* An error has already been reported. Bail out to avoid null
4830 * dereferences later in this function.
4835 /* Copy locations from the old gl_PerVertex interface block. */
4836 for (unsigned i
= 0; i
< num_variables
; i
++) {
4837 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
4839 _mesa_glsl_error(&loc
, state
,
4840 "redeclaration of gl_PerVertex must be a subset "
4841 "of the built-in members of gl_PerVertex");
4843 fields
[i
].location
=
4844 earlier_per_vertex
->fields
.structure
[j
].location
;
4845 fields
[i
].interpolation
=
4846 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
4847 fields
[i
].centroid
=
4848 earlier_per_vertex
->fields
.structure
[j
].centroid
;
4852 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
4855 * If a built-in interface block is redeclared, it must appear in
4856 * the shader before any use of any member included in the built-in
4857 * declaration, or a compilation error will result.
4859 * This appears to be a clarification to the behaviour established for
4860 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
4861 * regardless of GLSL version.
4863 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
4864 v
.run(instructions
);
4865 if (v
.usage_found()) {
4866 _mesa_glsl_error(&loc
, state
,
4867 "redeclaration of a built-in interface block must "
4868 "appear before any use of any member of the "
4873 const glsl_type
*block_type
=
4874 glsl_type::get_interface_instance(fields
,
4879 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
4880 YYLTYPE loc
= this->get_location();
4881 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
4882 "already taken in the current scope",
4883 this->block_name
, iface_type_name
);
4886 /* Since interface blocks cannot contain statements, it should be
4887 * impossible for the block to generate any instructions.
4889 assert(declared_variables
.is_empty());
4891 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4893 * Geometry shader input variables get the per-vertex values written
4894 * out by vertex shader output variables of the same names. Since a
4895 * geometry shader operates on a set of vertices, each input varying
4896 * variable (or input block, see interface blocks below) needs to be
4897 * declared as an array.
4899 if (state
->target
== geometry_shader
&& !this->is_array
&&
4900 var_mode
== ir_var_shader_in
) {
4901 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
4904 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
4907 * "If an instance name (instance-name) is used, then it puts all the
4908 * members inside a scope within its own name space, accessed with the
4909 * field selector ( . ) operator (analogously to structures)."
4911 if (this->instance_name
) {
4912 if (redeclaring_per_vertex
) {
4913 /* When a built-in in an unnamed interface block is redeclared,
4914 * get_variable_being_redeclared() calls
4915 * check_builtin_array_max_size() to make sure that built-in array
4916 * variables aren't redeclared to illegal sizes. But we're looking
4917 * at a redeclaration of a named built-in interface block. So we
4918 * have to manually call check_builtin_array_max_size() for all parts
4919 * of the interface that are arrays.
4921 for (unsigned i
= 0; i
< num_variables
; i
++) {
4922 if (fields
[i
].type
->is_array()) {
4923 const unsigned size
= fields
[i
].type
->array_size();
4924 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
4928 validate_identifier(this->instance_name
, loc
, state
);
4933 if (this->is_array
) {
4934 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
4936 * For uniform blocks declared an array, each individual array
4937 * element corresponds to a separate buffer object backing one
4938 * instance of the block. As the array size indicates the number
4939 * of buffer objects needed, uniform block array declarations
4940 * must specify an array size.
4942 * And a few paragraphs later:
4944 * Geometry shader input blocks must be declared as arrays and
4945 * follow the array declaration and linking rules for all
4946 * geometry shader inputs. All other input and output block
4947 * arrays must specify an array size.
4949 * The upshot of this is that the only circumstance where an
4950 * interface array size *doesn't* need to be specified is on a
4951 * geometry shader input.
4953 if (this->array_size
== NULL
&&
4954 (state
->target
!= geometry_shader
|| !this->layout
.flags
.q
.in
)) {
4955 _mesa_glsl_error(&loc
, state
,
4956 "only geometry shader inputs may be unsized "
4957 "instance block arrays");
4961 const glsl_type
*block_array_type
=
4962 process_array_type(&loc
, block_type
, this->array_size
, state
);
4964 var
= new(state
) ir_variable(block_array_type
,
4965 this->instance_name
,
4968 var
= new(state
) ir_variable(block_type
,
4969 this->instance_name
,
4973 if (state
->target
== geometry_shader
&& var_mode
== ir_var_shader_in
)
4974 handle_geometry_shader_input_decl(state
, loc
, var
);
4976 if (ir_variable
*earlier
=
4977 state
->symbols
->get_variable(this->instance_name
)) {
4978 if (!redeclaring_per_vertex
) {
4979 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
4980 this->instance_name
);
4982 earlier
->type
= var
->type
;
4983 earlier
->reinit_interface_type(block_type
);
4986 state
->symbols
->add_variable(var
);
4987 instructions
->push_tail(var
);
4990 /* In order to have an array size, the block must also be declared with
4993 assert(!this->is_array
);
4995 for (unsigned i
= 0; i
< num_variables
; i
++) {
4997 new(state
) ir_variable(fields
[i
].type
,
4998 ralloc_strdup(state
, fields
[i
].name
),
5000 var
->interpolation
= fields
[i
].interpolation
;
5001 var
->centroid
= fields
[i
].centroid
;
5002 var
->init_interface_type(block_type
);
5004 if (redeclaring_per_vertex
) {
5005 ir_variable
*earlier
=
5006 get_variable_being_redeclared(var
, loc
, state
,
5007 true /* allow_all_redeclarations */);
5008 if (strncmp(var
->name
, "gl_", 3) != 0 || earlier
== NULL
) {
5009 _mesa_glsl_error(&loc
, state
,
5010 "redeclaration of gl_PerVertex can only "
5011 "include built-in variables");
5013 earlier
->reinit_interface_type(block_type
);
5018 if (state
->symbols
->get_variable(var
->name
) != NULL
)
5019 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
5021 /* Propagate the "binding" keyword into this UBO's fields;
5022 * the UBO declaration itself doesn't get an ir_variable unless it
5023 * has an instance name. This is ugly.
5025 var
->explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
5026 var
->binding
= this->layout
.binding
;
5028 state
->symbols
->add_variable(var
);
5029 instructions
->push_tail(var
);
5032 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
5033 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
5035 * It is also a compilation error ... to redeclare a built-in
5036 * block and then use a member from that built-in block that was
5037 * not included in the redeclaration.
5039 * This appears to be a clarification to the behaviour established
5040 * for gl_PerVertex by GLSL 1.50, therefore we implement this
5041 * behaviour regardless of GLSL version.
5043 * To prevent the shader from using a member that was not included in
5044 * the redeclaration, we disable any ir_variables that are still
5045 * associated with the old declaration of gl_PerVertex (since we've
5046 * already updated all of the variables contained in the new
5047 * gl_PerVertex to point to it).
5049 * As a side effect this will prevent
5050 * validate_intrastage_interface_blocks() from getting confused and
5051 * thinking there are conflicting definitions of gl_PerVertex in the
5054 foreach_list_safe(node
, instructions
) {
5055 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5057 var
->get_interface_type() == earlier_per_vertex
&&
5058 var
->mode
== var_mode
) {
5059 state
->symbols
->disable_variable(var
->name
);
5071 ast_gs_input_layout::hir(exec_list
*instructions
,
5072 struct _mesa_glsl_parse_state
*state
)
5074 YYLTYPE loc
= this->get_location();
5076 /* If any geometry input layout declaration preceded this one, make sure it
5077 * was consistent with this one.
5079 if (state
->gs_input_prim_type_specified
&&
5080 state
->gs_input_prim_type
!= this->prim_type
) {
5081 _mesa_glsl_error(&loc
, state
,
5082 "geometry shader input layout does not match"
5083 " previous declaration");
5087 /* If any shader inputs occurred before this declaration and specified an
5088 * array size, make sure the size they specified is consistent with the
5091 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
5092 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
5093 _mesa_glsl_error(&loc
, state
,
5094 "this geometry shader input layout implies %u vertices"
5095 " per primitive, but a previous input is declared"
5096 " with size %u", num_vertices
, state
->gs_input_size
);
5100 state
->gs_input_prim_type_specified
= true;
5101 state
->gs_input_prim_type
= this->prim_type
;
5103 /* If any shader inputs occurred before this declaration and did not
5104 * specify an array size, their size is determined now.
5106 foreach_list (node
, instructions
) {
5107 ir_variable
*var
= ((ir_instruction
*) node
)->as_variable();
5108 if (var
== NULL
|| var
->mode
!= ir_var_shader_in
)
5111 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
5115 if (var
->type
->is_unsized_array()) {
5116 if (var
->max_array_access
>= num_vertices
) {
5117 _mesa_glsl_error(&loc
, state
,
5118 "this geometry shader input layout implies %u"
5119 " vertices, but an access to element %u of input"
5120 " `%s' already exists", num_vertices
,
5121 var
->max_array_access
, var
->name
);
5123 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
5134 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
5135 exec_list
*instructions
)
5137 bool gl_FragColor_assigned
= false;
5138 bool gl_FragData_assigned
= false;
5139 bool user_defined_fs_output_assigned
= false;
5140 ir_variable
*user_defined_fs_output
= NULL
;
5142 /* It would be nice to have proper location information. */
5144 memset(&loc
, 0, sizeof(loc
));
5146 foreach_list(node
, instructions
) {
5147 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
5149 if (!var
|| !var
->assigned
)
5152 if (strcmp(var
->name
, "gl_FragColor") == 0)
5153 gl_FragColor_assigned
= true;
5154 else if (strcmp(var
->name
, "gl_FragData") == 0)
5155 gl_FragData_assigned
= true;
5156 else if (strncmp(var
->name
, "gl_", 3) != 0) {
5157 if (state
->target
== fragment_shader
&&
5158 var
->mode
== ir_var_shader_out
) {
5159 user_defined_fs_output_assigned
= true;
5160 user_defined_fs_output
= var
;
5165 /* From the GLSL 1.30 spec:
5167 * "If a shader statically assigns a value to gl_FragColor, it
5168 * may not assign a value to any element of gl_FragData. If a
5169 * shader statically writes a value to any element of
5170 * gl_FragData, it may not assign a value to
5171 * gl_FragColor. That is, a shader may assign values to either
5172 * gl_FragColor or gl_FragData, but not both. Multiple shaders
5173 * linked together must also consistently write just one of
5174 * these variables. Similarly, if user declared output
5175 * variables are in use (statically assigned to), then the
5176 * built-in variables gl_FragColor and gl_FragData may not be
5177 * assigned to. These incorrect usages all generate compile
5180 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
5181 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5182 "`gl_FragColor' and `gl_FragData'");
5183 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
5184 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5185 "`gl_FragColor' and `%s'",
5186 user_defined_fs_output
->name
);
5187 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
5188 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5189 "`gl_FragData' and `%s'",
5190 user_defined_fs_output
->name
);
5196 remove_per_vertex_blocks(exec_list
*instructions
,
5197 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
5199 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
5200 * if it exists in this shader type.
5202 const glsl_type
*per_vertex
= NULL
;
5204 case ir_var_shader_in
:
5205 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
5206 per_vertex
= gl_in
->get_interface_type();
5208 case ir_var_shader_out
:
5209 if (ir_variable
*gl_Position
=
5210 state
->symbols
->get_variable("gl_Position")) {
5211 per_vertex
= gl_Position
->get_interface_type();
5215 assert(!"Unexpected mode");
5219 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
5220 * need to do anything.
5222 if (per_vertex
== NULL
)
5225 /* If the interface block is used by the shader, then we don't need to do
5228 interface_block_usage_visitor
v(mode
, per_vertex
);
5229 v
.run(instructions
);
5230 if (v
.usage_found())
5233 /* Remove any ir_variable declarations that refer to the interface block
5236 foreach_list_safe(node
, instructions
) {
5237 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5238 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
5239 var
->mode
== mode
) {
5240 state
->symbols
->disable_variable(var
->name
);