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 const glsl_type
*lhs_type
, ir_rvalue
*rhs
,
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 size of the LHS is zero,
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_array() && rhs
->type
->is_array()
700 && (lhs_type
->element_type() == rhs
->type
->element_type())
701 && (lhs_type
->array_size() == 0)) {
705 /* Check for implicit conversion in GLSL 1.20 */
706 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
707 if (rhs
->type
== lhs_type
)
715 mark_whole_array_access(ir_rvalue
*access
)
717 ir_dereference_variable
*deref
= access
->as_dereference_variable();
719 if (deref
&& deref
->var
) {
720 deref
->var
->max_array_access
= deref
->type
->length
- 1;
725 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
726 const char *non_lvalue_description
,
727 ir_rvalue
*lhs
, ir_rvalue
*rhs
, bool is_initializer
,
731 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
733 /* If the assignment LHS comes back as an ir_binop_vector_extract
734 * expression, move it to the RHS as an ir_triop_vector_insert.
736 if (lhs
->ir_type
== ir_type_expression
) {
737 ir_expression
*const expr
= lhs
->as_expression();
739 if (unlikely(expr
->operation
== ir_binop_vector_extract
)) {
741 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
743 if (new_rhs
== NULL
) {
744 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
747 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
748 expr
->operands
[0]->type
,
752 lhs
= expr
->operands
[0]->clone(ctx
, NULL
);
757 ir_variable
*lhs_var
= lhs
->variable_referenced();
759 lhs_var
->assigned
= true;
761 if (!error_emitted
) {
762 if (non_lvalue_description
!= NULL
) {
763 _mesa_glsl_error(&lhs_loc
, state
,
765 non_lvalue_description
);
766 error_emitted
= true;
767 } else if (lhs
->variable_referenced() != NULL
768 && lhs
->variable_referenced()->read_only
) {
769 _mesa_glsl_error(&lhs_loc
, state
,
770 "assignment to read-only variable '%s'",
771 lhs
->variable_referenced()->name
);
772 error_emitted
= true;
774 } else if (lhs
->type
->is_array() &&
775 !state
->check_version(120, 300, &lhs_loc
,
776 "whole array assignment forbidden")) {
777 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
779 * "Other binary or unary expressions, non-dereferenced
780 * arrays, function names, swizzles with repeated fields,
781 * and constants cannot be l-values."
783 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
785 error_emitted
= true;
786 } else if (!lhs
->is_lvalue()) {
787 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
788 error_emitted
= true;
793 validate_assignment(state
, lhs
->type
, rhs
, is_initializer
);
794 if (new_rhs
== NULL
) {
795 _mesa_glsl_error(& lhs_loc
, state
, "type mismatch");
799 /* If the LHS array was not declared with a size, it takes it size from
800 * the RHS. If the LHS is an l-value and a whole array, it must be a
801 * dereference of a variable. Any other case would require that the LHS
802 * is either not an l-value or not a whole array.
804 if (lhs
->type
->array_size() == 0) {
805 ir_dereference
*const d
= lhs
->as_dereference();
809 ir_variable
*const var
= d
->variable_referenced();
813 if (var
->max_array_access
>= unsigned(rhs
->type
->array_size())) {
814 /* FINISHME: This should actually log the location of the RHS. */
815 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
817 var
->max_array_access
);
820 var
->type
= glsl_type::get_array_instance(lhs
->type
->element_type(),
821 rhs
->type
->array_size());
824 mark_whole_array_access(rhs
);
825 mark_whole_array_access(lhs
);
828 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
829 * but not post_inc) need the converted assigned value as an rvalue
830 * to handle things like:
834 * So we always just store the computed value being assigned to a
835 * temporary and return a deref of that temporary. If the rvalue
836 * ends up not being used, the temp will get copy-propagated out.
838 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
840 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
841 instructions
->push_tail(var
);
842 instructions
->push_tail(new(ctx
) ir_assignment(deref_var
, rhs
));
843 deref_var
= new(ctx
) ir_dereference_variable(var
);
846 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
848 return new(ctx
) ir_dereference_variable(var
);
852 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
854 void *ctx
= ralloc_parent(lvalue
);
857 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
859 instructions
->push_tail(var
);
860 var
->mode
= ir_var_auto
;
862 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
865 return new(ctx
) ir_dereference_variable(var
);
870 ast_node::hir(exec_list
*instructions
,
871 struct _mesa_glsl_parse_state
*state
)
880 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
883 ir_rvalue
*cmp
= NULL
;
885 if (operation
== ir_binop_all_equal
)
886 join_op
= ir_binop_logic_and
;
888 join_op
= ir_binop_logic_or
;
890 switch (op0
->type
->base_type
) {
891 case GLSL_TYPE_FLOAT
:
895 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
897 case GLSL_TYPE_ARRAY
: {
898 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
899 ir_rvalue
*e0
, *e1
, *result
;
901 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
902 new(mem_ctx
) ir_constant(i
));
903 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
904 new(mem_ctx
) ir_constant(i
));
905 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
908 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
914 mark_whole_array_access(op0
);
915 mark_whole_array_access(op1
);
919 case GLSL_TYPE_STRUCT
: {
920 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
921 ir_rvalue
*e0
, *e1
, *result
;
922 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
924 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
926 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
928 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
931 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
939 case GLSL_TYPE_ERROR
:
941 case GLSL_TYPE_SAMPLER
:
942 case GLSL_TYPE_INTERFACE
:
943 /* I assume a comparison of a struct containing a sampler just
944 * ignores the sampler present in the type.
950 cmp
= new(mem_ctx
) ir_constant(true);
955 /* For logical operations, we want to ensure that the operands are
956 * scalar booleans. If it isn't, emit an error and return a constant
957 * boolean to avoid triggering cascading error messages.
960 get_scalar_boolean_operand(exec_list
*instructions
,
961 struct _mesa_glsl_parse_state
*state
,
962 ast_expression
*parent_expr
,
964 const char *operand_name
,
967 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
969 ir_rvalue
*val
= expr
->hir(instructions
, state
);
971 if (val
->type
->is_boolean() && val
->type
->is_scalar())
974 if (!*error_emitted
) {
975 YYLTYPE loc
= expr
->get_location();
976 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
978 parent_expr
->operator_string(parent_expr
->oper
));
979 *error_emitted
= true;
982 return new(ctx
) ir_constant(true);
986 * If name refers to a builtin array whose maximum allowed size is less than
987 * size, report an error and return true. Otherwise return false.
990 check_builtin_array_max_size(const char *name
, unsigned size
,
991 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
993 if ((strcmp("gl_TexCoord", name
) == 0)
994 && (size
> state
->Const
.MaxTextureCoords
)) {
995 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
997 * "The size [of gl_TexCoord] can be at most
998 * gl_MaxTextureCoords."
1000 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1001 "be larger than gl_MaxTextureCoords (%u)",
1002 state
->Const
.MaxTextureCoords
);
1003 } else if (strcmp("gl_ClipDistance", name
) == 0
1004 && size
> state
->Const
.MaxClipPlanes
) {
1005 /* From section 7.1 (Vertex Shader Special Variables) of the
1008 * "The gl_ClipDistance array is predeclared as unsized and
1009 * must be sized by the shader either redeclaring it with a
1010 * size or indexing it only with integral constant
1011 * expressions. ... The size can be at most
1012 * gl_MaxClipDistances."
1014 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1015 "be larger than gl_MaxClipDistances (%u)",
1016 state
->Const
.MaxClipPlanes
);
1021 * Create the constant 1, of a which is appropriate for incrementing and
1022 * decrementing values of the given GLSL type. For example, if type is vec4,
1023 * this creates a constant value of 1.0 having type float.
1025 * If the given type is invalid for increment and decrement operators, return
1026 * a floating point 1--the error will be detected later.
1029 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1031 switch (type
->base_type
) {
1032 case GLSL_TYPE_UINT
:
1033 return new(ctx
) ir_constant((unsigned) 1);
1035 return new(ctx
) ir_constant(1);
1037 case GLSL_TYPE_FLOAT
:
1038 return new(ctx
) ir_constant(1.0f
);
1043 ast_expression::hir(exec_list
*instructions
,
1044 struct _mesa_glsl_parse_state
*state
)
1047 static const int operations
[AST_NUM_OPERATORS
] = {
1048 -1, /* ast_assign doesn't convert to ir_expression. */
1049 -1, /* ast_plus doesn't convert to ir_expression. */
1063 ir_binop_any_nequal
,
1073 /* Note: The following block of expression types actually convert
1074 * to multiple IR instructions.
1076 ir_binop_mul
, /* ast_mul_assign */
1077 ir_binop_div
, /* ast_div_assign */
1078 ir_binop_mod
, /* ast_mod_assign */
1079 ir_binop_add
, /* ast_add_assign */
1080 ir_binop_sub
, /* ast_sub_assign */
1081 ir_binop_lshift
, /* ast_ls_assign */
1082 ir_binop_rshift
, /* ast_rs_assign */
1083 ir_binop_bit_and
, /* ast_and_assign */
1084 ir_binop_bit_xor
, /* ast_xor_assign */
1085 ir_binop_bit_or
, /* ast_or_assign */
1087 -1, /* ast_conditional doesn't convert to ir_expression. */
1088 ir_binop_add
, /* ast_pre_inc. */
1089 ir_binop_sub
, /* ast_pre_dec. */
1090 ir_binop_add
, /* ast_post_inc. */
1091 ir_binop_sub
, /* ast_post_dec. */
1092 -1, /* ast_field_selection doesn't conv to ir_expression. */
1093 -1, /* ast_array_index doesn't convert to ir_expression. */
1094 -1, /* ast_function_call doesn't conv to ir_expression. */
1095 -1, /* ast_identifier doesn't convert to ir_expression. */
1096 -1, /* ast_int_constant doesn't convert to ir_expression. */
1097 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1098 -1, /* ast_float_constant doesn't conv to ir_expression. */
1099 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1100 -1, /* ast_sequence doesn't convert to ir_expression. */
1102 ir_rvalue
*result
= NULL
;
1104 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1105 bool error_emitted
= false;
1108 loc
= this->get_location();
1110 switch (this->oper
) {
1112 assert(!"ast_aggregate: Should never get here.");
1116 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1117 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1119 result
= do_assignment(instructions
, state
,
1120 this->subexpressions
[0]->non_lvalue_description
,
1121 op
[0], op
[1], false,
1122 this->subexpressions
[0]->get_location());
1123 error_emitted
= result
->type
->is_error();
1128 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1130 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1132 error_emitted
= type
->is_error();
1138 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1140 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1142 error_emitted
= type
->is_error();
1144 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1152 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1153 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1155 type
= arithmetic_result_type(op
[0], op
[1],
1156 (this->oper
== ast_mul
),
1158 error_emitted
= type
->is_error();
1160 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1165 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1166 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1168 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1170 assert(operations
[this->oper
] == ir_binop_mod
);
1172 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1174 error_emitted
= type
->is_error();
1179 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1180 error_emitted
= true;
1183 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1184 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1185 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1187 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1189 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1196 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1197 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1199 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1201 /* The relational operators must either generate an error or result
1202 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1204 assert(type
->is_error()
1205 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1206 && type
->is_scalar()));
1208 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1210 error_emitted
= type
->is_error();
1215 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1216 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1218 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1220 * "The equality operators equal (==), and not equal (!=)
1221 * operate on all types. They result in a scalar Boolean. If
1222 * the operand types do not match, then there must be a
1223 * conversion from Section 4.1.10 "Implicit Conversions"
1224 * applied to one operand that can make them match, in which
1225 * case this conversion is done."
1227 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1228 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1229 || (op
[0]->type
!= op
[1]->type
)) {
1230 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1231 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1232 error_emitted
= true;
1233 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1234 !state
->check_version(120, 300, &loc
,
1235 "array comparisons forbidden")) {
1236 error_emitted
= true;
1239 if (error_emitted
) {
1240 result
= new(ctx
) ir_constant(false);
1242 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1243 assert(result
->type
== glsl_type::bool_type
);
1250 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1251 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1252 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1254 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1256 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1260 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1262 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1263 error_emitted
= true;
1266 if (!op
[0]->type
->is_integer()) {
1267 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1268 error_emitted
= true;
1271 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1272 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1275 case ast_logic_and
: {
1276 exec_list rhs_instructions
;
1277 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1278 "LHS", &error_emitted
);
1279 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1280 "RHS", &error_emitted
);
1282 if (rhs_instructions
.is_empty()) {
1283 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1284 type
= result
->type
;
1286 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1289 instructions
->push_tail(tmp
);
1291 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1292 instructions
->push_tail(stmt
);
1294 stmt
->then_instructions
.append_list(&rhs_instructions
);
1295 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1296 ir_assignment
*const then_assign
=
1297 new(ctx
) ir_assignment(then_deref
, op
[1]);
1298 stmt
->then_instructions
.push_tail(then_assign
);
1300 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1301 ir_assignment
*const else_assign
=
1302 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1303 stmt
->else_instructions
.push_tail(else_assign
);
1305 result
= new(ctx
) ir_dereference_variable(tmp
);
1311 case ast_logic_or
: {
1312 exec_list rhs_instructions
;
1313 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1314 "LHS", &error_emitted
);
1315 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1316 "RHS", &error_emitted
);
1318 if (rhs_instructions
.is_empty()) {
1319 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1320 type
= result
->type
;
1322 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1325 instructions
->push_tail(tmp
);
1327 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1328 instructions
->push_tail(stmt
);
1330 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1331 ir_assignment
*const then_assign
=
1332 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1333 stmt
->then_instructions
.push_tail(then_assign
);
1335 stmt
->else_instructions
.append_list(&rhs_instructions
);
1336 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1337 ir_assignment
*const else_assign
=
1338 new(ctx
) ir_assignment(else_deref
, op
[1]);
1339 stmt
->else_instructions
.push_tail(else_assign
);
1341 result
= new(ctx
) ir_dereference_variable(tmp
);
1348 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1350 * "The logical binary operators and (&&), or ( | | ), and
1351 * exclusive or (^^). They operate only on two Boolean
1352 * expressions and result in a Boolean expression."
1354 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1356 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1359 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1364 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1365 "operand", &error_emitted
);
1367 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1371 case ast_mul_assign
:
1372 case ast_div_assign
:
1373 case ast_add_assign
:
1374 case ast_sub_assign
: {
1375 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1376 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1378 type
= arithmetic_result_type(op
[0], op
[1],
1379 (this->oper
== ast_mul_assign
),
1382 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1385 result
= do_assignment(instructions
, state
,
1386 this->subexpressions
[0]->non_lvalue_description
,
1387 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1388 this->subexpressions
[0]->get_location());
1389 error_emitted
= (op
[0]->type
->is_error());
1391 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1392 * explicitly test for this because none of the binary expression
1393 * operators allow array operands either.
1399 case ast_mod_assign
: {
1400 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1401 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1403 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1405 assert(operations
[this->oper
] == ir_binop_mod
);
1407 ir_rvalue
*temp_rhs
;
1408 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1411 result
= do_assignment(instructions
, state
,
1412 this->subexpressions
[0]->non_lvalue_description
,
1413 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1414 this->subexpressions
[0]->get_location());
1415 error_emitted
= type
->is_error();
1420 case ast_rs_assign
: {
1421 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1422 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1423 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1425 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1426 type
, op
[0], op
[1]);
1427 result
= do_assignment(instructions
, state
,
1428 this->subexpressions
[0]->non_lvalue_description
,
1429 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1430 this->subexpressions
[0]->get_location());
1431 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1435 case ast_and_assign
:
1436 case ast_xor_assign
:
1437 case ast_or_assign
: {
1438 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1439 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1440 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1442 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1443 type
, op
[0], op
[1]);
1444 result
= do_assignment(instructions
, state
,
1445 this->subexpressions
[0]->non_lvalue_description
,
1446 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1447 this->subexpressions
[0]->get_location());
1448 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1452 case ast_conditional
: {
1453 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1455 * "The ternary selection operator (?:). It operates on three
1456 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1457 * first expression, which must result in a scalar Boolean."
1459 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1460 "condition", &error_emitted
);
1462 /* The :? operator is implemented by generating an anonymous temporary
1463 * followed by an if-statement. The last instruction in each branch of
1464 * the if-statement assigns a value to the anonymous temporary. This
1465 * temporary is the r-value of the expression.
1467 exec_list then_instructions
;
1468 exec_list else_instructions
;
1470 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1471 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1473 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1475 * "The second and third expressions can be any type, as
1476 * long their types match, or there is a conversion in
1477 * Section 4.1.10 "Implicit Conversions" that can be applied
1478 * to one of the expressions to make their types match. This
1479 * resulting matching type is the type of the entire
1482 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1483 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1484 || (op
[1]->type
!= op
[2]->type
)) {
1485 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1487 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1488 "operator must have matching types");
1489 error_emitted
= true;
1490 type
= glsl_type::error_type
;
1495 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1497 * "The second and third expressions must be the same type, but can
1498 * be of any type other than an array."
1500 if (type
->is_array() &&
1501 !state
->check_version(120, 300, &loc
,
1502 "second and third operands of ?: operator "
1503 "cannot be arrays")) {
1504 error_emitted
= true;
1507 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1508 ir_constant
*then_val
= op
[1]->constant_expression_value();
1509 ir_constant
*else_val
= op
[2]->constant_expression_value();
1511 if (then_instructions
.is_empty()
1512 && else_instructions
.is_empty()
1513 && (cond_val
!= NULL
) && (then_val
!= NULL
) && (else_val
!= NULL
)) {
1514 result
= (cond_val
->value
.b
[0]) ? then_val
: else_val
;
1516 ir_variable
*const tmp
=
1517 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1518 instructions
->push_tail(tmp
);
1520 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1521 instructions
->push_tail(stmt
);
1523 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1524 ir_dereference
*const then_deref
=
1525 new(ctx
) ir_dereference_variable(tmp
);
1526 ir_assignment
*const then_assign
=
1527 new(ctx
) ir_assignment(then_deref
, op
[1]);
1528 stmt
->then_instructions
.push_tail(then_assign
);
1530 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1531 ir_dereference
*const else_deref
=
1532 new(ctx
) ir_dereference_variable(tmp
);
1533 ir_assignment
*const else_assign
=
1534 new(ctx
) ir_assignment(else_deref
, op
[2]);
1535 stmt
->else_instructions
.push_tail(else_assign
);
1537 result
= new(ctx
) ir_dereference_variable(tmp
);
1544 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1545 ? "pre-increment operation" : "pre-decrement operation";
1547 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1548 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1550 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1552 ir_rvalue
*temp_rhs
;
1553 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1556 result
= do_assignment(instructions
, state
,
1557 this->subexpressions
[0]->non_lvalue_description
,
1558 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1559 this->subexpressions
[0]->get_location());
1560 error_emitted
= op
[0]->type
->is_error();
1565 case ast_post_dec
: {
1566 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1567 ? "post-increment operation" : "post-decrement operation";
1568 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1569 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1571 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1573 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1575 ir_rvalue
*temp_rhs
;
1576 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1579 /* Get a temporary of a copy of the lvalue before it's modified.
1580 * This may get thrown away later.
1582 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1584 (void)do_assignment(instructions
, state
,
1585 this->subexpressions
[0]->non_lvalue_description
,
1586 op
[0]->clone(ctx
, NULL
), temp_rhs
, false,
1587 this->subexpressions
[0]->get_location());
1589 error_emitted
= op
[0]->type
->is_error();
1593 case ast_field_selection
:
1594 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1597 case ast_array_index
: {
1598 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1600 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1601 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1603 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1606 if (result
->type
->is_error())
1607 error_emitted
= true;
1612 case ast_function_call
:
1613 /* Should *NEVER* get here. ast_function_call should always be handled
1614 * by ast_function_expression::hir.
1619 case ast_identifier
: {
1620 /* ast_identifier can appear several places in a full abstract syntax
1621 * tree. This particular use must be at location specified in the grammar
1622 * as 'variable_identifier'.
1625 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1629 result
= new(ctx
) ir_dereference_variable(var
);
1631 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1632 this->primary_expression
.identifier
);
1634 result
= ir_rvalue::error_value(ctx
);
1635 error_emitted
= true;
1640 case ast_int_constant
:
1641 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1644 case ast_uint_constant
:
1645 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1648 case ast_float_constant
:
1649 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1652 case ast_bool_constant
:
1653 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1656 case ast_sequence
: {
1657 /* It should not be possible to generate a sequence in the AST without
1658 * any expressions in it.
1660 assert(!this->expressions
.is_empty());
1662 /* The r-value of a sequence is the last expression in the sequence. If
1663 * the other expressions in the sequence do not have side-effects (and
1664 * therefore add instructions to the instruction list), they get dropped
1667 exec_node
*previous_tail_pred
= NULL
;
1668 YYLTYPE previous_operand_loc
= loc
;
1670 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1671 /* If one of the operands of comma operator does not generate any
1672 * code, we want to emit a warning. At each pass through the loop
1673 * previous_tail_pred will point to the last instruction in the
1674 * stream *before* processing the previous operand. Naturally,
1675 * instructions->tail_pred will point to the last instruction in the
1676 * stream *after* processing the previous operand. If the two
1677 * pointers match, then the previous operand had no effect.
1679 * The warning behavior here differs slightly from GCC. GCC will
1680 * only emit a warning if none of the left-hand operands have an
1681 * effect. However, it will emit a warning for each. I believe that
1682 * there are some cases in C (especially with GCC extensions) where
1683 * it is useful to have an intermediate step in a sequence have no
1684 * effect, but I don't think these cases exist in GLSL. Either way,
1685 * it would be a giant hassle to replicate that behavior.
1687 if (previous_tail_pred
== instructions
->tail_pred
) {
1688 _mesa_glsl_warning(&previous_operand_loc
, state
,
1689 "left-hand operand of comma expression has "
1693 /* tail_pred is directly accessed instead of using the get_tail()
1694 * method for performance reasons. get_tail() has extra code to
1695 * return NULL when the list is empty. We don't care about that
1696 * here, so using tail_pred directly is fine.
1698 previous_tail_pred
= instructions
->tail_pred
;
1699 previous_operand_loc
= ast
->get_location();
1701 result
= ast
->hir(instructions
, state
);
1704 /* Any errors should have already been emitted in the loop above.
1706 error_emitted
= true;
1710 type
= NULL
; /* use result->type, not type. */
1711 assert(result
!= NULL
);
1713 if (result
->type
->is_error() && !error_emitted
)
1714 _mesa_glsl_error(& loc
, state
, "type mismatch");
1721 ast_expression_statement::hir(exec_list
*instructions
,
1722 struct _mesa_glsl_parse_state
*state
)
1724 /* It is possible to have expression statements that don't have an
1725 * expression. This is the solitary semicolon:
1727 * for (i = 0; i < 5; i++)
1730 * In this case the expression will be NULL. Test for NULL and don't do
1731 * anything in that case.
1733 if (expression
!= NULL
)
1734 expression
->hir(instructions
, state
);
1736 /* Statements do not have r-values.
1743 ast_compound_statement::hir(exec_list
*instructions
,
1744 struct _mesa_glsl_parse_state
*state
)
1747 state
->symbols
->push_scope();
1749 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1750 ast
->hir(instructions
, state
);
1753 state
->symbols
->pop_scope();
1755 /* Compound statements do not have r-values.
1761 static const glsl_type
*
1762 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
, ast_node
*array_size
,
1763 struct _mesa_glsl_parse_state
*state
)
1765 unsigned length
= 0;
1768 return glsl_type::error_type
;
1770 /* From page 19 (page 25) of the GLSL 1.20 spec:
1772 * "Only one-dimensional arrays may be declared."
1774 if (base
->is_array()) {
1775 _mesa_glsl_error(loc
, state
,
1776 "invalid array of `%s' (only one-dimensional arrays "
1779 return glsl_type::error_type
;
1782 if (array_size
!= NULL
) {
1783 exec_list dummy_instructions
;
1784 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1785 YYLTYPE loc
= array_size
->get_location();
1788 if (!ir
->type
->is_integer()) {
1789 _mesa_glsl_error(& loc
, state
, "array size must be integer type");
1790 } else if (!ir
->type
->is_scalar()) {
1791 _mesa_glsl_error(& loc
, state
, "array size must be scalar type");
1793 ir_constant
*const size
= ir
->constant_expression_value();
1796 _mesa_glsl_error(& loc
, state
, "array size must be a "
1797 "constant valued expression");
1798 } else if (size
->value
.i
[0] <= 0) {
1799 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1801 assert(size
->type
== ir
->type
);
1802 length
= size
->value
.u
[0];
1804 /* If the array size is const (and we've verified that
1805 * it is) then no instructions should have been emitted
1806 * when we converted it to HIR. If they were emitted,
1807 * then either the array size isn't const after all, or
1808 * we are emitting unnecessary instructions.
1810 assert(dummy_instructions
.is_empty());
1816 const glsl_type
*array_type
= glsl_type::get_array_instance(base
, length
);
1817 return array_type
!= NULL
? array_type
: glsl_type::error_type
;
1822 ast_type_specifier::glsl_type(const char **name
,
1823 struct _mesa_glsl_parse_state
*state
) const
1825 const struct glsl_type
*type
;
1827 type
= state
->symbols
->get_type(this->type_name
);
1828 *name
= this->type_name
;
1830 if (this->is_array
) {
1831 YYLTYPE loc
= this->get_location();
1832 type
= process_array_type(&loc
, type
, this->array_size
, state
);
1839 ast_fully_specified_type::glsl_type(const char **name
,
1840 struct _mesa_glsl_parse_state
*state
) const
1842 const struct glsl_type
*type
= this->specifier
->glsl_type(name
, state
);
1847 if (type
->base_type
== GLSL_TYPE_FLOAT
1849 && state
->target
== fragment_shader
1850 && this->qualifier
.precision
== ast_precision_none
1851 && state
->symbols
->get_variable("#default precision") == NULL
) {
1852 YYLTYPE loc
= this->get_location();
1853 _mesa_glsl_error(&loc
, state
,
1854 "no precision specified this scope for type `%s'",
1862 * Determine whether a toplevel variable declaration declares a varying. This
1863 * function operates by examining the variable's mode and the shader target,
1864 * so it correctly identifies linkage variables regardless of whether they are
1865 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1867 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1868 * this function will produce undefined results.
1871 is_varying_var(ir_variable
*var
, _mesa_glsl_parser_targets target
)
1875 return var
->mode
== ir_var_shader_out
;
1876 case fragment_shader
:
1877 return var
->mode
== ir_var_shader_in
;
1879 return var
->mode
== ir_var_shader_out
|| var
->mode
== ir_var_shader_in
;
1885 * Matrix layout qualifiers are only allowed on certain types
1888 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
1890 const glsl_type
*type
,
1893 if (var
&& !var
->is_in_uniform_block()) {
1894 /* Layout qualifiers may only apply to interface blocks and fields in
1897 _mesa_glsl_error(loc
, state
,
1898 "uniform block layout qualifiers row_major and "
1899 "column_major may not be applied to variables "
1900 "outside of uniform blocks");
1901 } else if (!type
->is_matrix()) {
1902 /* The OpenGL ES 3.0 conformance tests did not originally allow
1903 * matrix layout qualifiers on non-matrices. However, the OpenGL
1904 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
1905 * amended to specifically allow these layouts on all types. Emit
1906 * a warning so that people know their code may not be portable.
1908 _mesa_glsl_warning(loc
, state
,
1909 "uniform block layout qualifiers row_major and "
1910 "column_major applied to non-matrix types may "
1911 "be rejected by older compilers");
1912 } else if (type
->is_record()) {
1913 /* We allow 'layout(row_major)' on structure types because it's the only
1914 * way to get row-major layouts on matrices contained in structures.
1916 _mesa_glsl_warning(loc
, state
,
1917 "uniform block layout qualifiers row_major and "
1918 "column_major applied to structure types is not "
1919 "strictly conformant and may be rejected by other "
1925 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
1928 const ast_type_qualifier
*qual
)
1930 if (var
->mode
!= ir_var_uniform
) {
1931 _mesa_glsl_error(loc
, state
,
1932 "the \"binding\" qualifier only applies to uniforms");
1936 if (qual
->binding
< 0) {
1937 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
1941 const struct gl_context
*const ctx
= state
->ctx
;
1942 unsigned elements
= var
->type
->is_array() ? var
->type
->length
: 1;
1943 unsigned max_index
= qual
->binding
+ elements
- 1;
1945 if (var
->type
->is_interface()) {
1946 /* UBOs. From page 60 of the GLSL 4.20 specification:
1947 * "If the binding point for any uniform block instance is less than zero,
1948 * or greater than or equal to the implementation-dependent maximum
1949 * number of uniform buffer bindings, a compilation error will occur.
1950 * When the binding identifier is used with a uniform block instanced as
1951 * an array of size N, all elements of the array from binding through
1952 * binding + N – 1 must be within this range."
1954 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
1956 if (max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
1957 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
1958 "the maximum number of UBO binding points (%d)",
1959 qual
->binding
, elements
,
1960 ctx
->Const
.MaxUniformBufferBindings
);
1963 } else if (var
->type
->is_sampler() ||
1964 (var
->type
->is_array() && var
->type
->fields
.array
->is_sampler())) {
1965 /* Samplers. From page 63 of the GLSL 4.20 specification:
1966 * "If the binding is less than zero, or greater than or equal to the
1967 * implementation-dependent maximum supported number of units, a
1968 * compilation error will occur. When the binding identifier is used
1969 * with an array of size N, all elements of the array from binding
1970 * through binding + N - 1 must be within this range."
1973 switch (state
->target
) {
1975 limit
= ctx
->Const
.VertexProgram
.MaxTextureImageUnits
;
1977 case geometry_shader
:
1978 limit
= ctx
->Const
.GeometryProgram
.MaxTextureImageUnits
;
1980 case fragment_shader
:
1981 limit
= ctx
->Const
.FragmentProgram
.MaxTextureImageUnits
;
1985 if (max_index
>= limit
) {
1986 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
1987 "exceeds the maximum number of texture image units "
1988 "(%d)", qual
->binding
, elements
, limit
);
1993 _mesa_glsl_error(loc
, state
,
1994 "the \"binding\" qualifier only applies to uniform "
1995 "blocks, samplers, or arrays of samplers");
2003 static glsl_interp_qualifier
2004 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2005 ir_variable_mode mode
,
2006 struct _mesa_glsl_parse_state
*state
,
2009 glsl_interp_qualifier interpolation
;
2010 if (qual
->flags
.q
.flat
)
2011 interpolation
= INTERP_QUALIFIER_FLAT
;
2012 else if (qual
->flags
.q
.noperspective
)
2013 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2014 else if (qual
->flags
.q
.smooth
)
2015 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2017 interpolation
= INTERP_QUALIFIER_NONE
;
2019 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2020 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2021 _mesa_glsl_error(loc
, state
,
2022 "interpolation qualifier `%s' can only be applied to "
2023 "shader inputs or outputs.",
2024 interpolation_string(interpolation
));
2028 if ((state
->target
== vertex_shader
&& mode
== ir_var_shader_in
) ||
2029 (state
->target
== fragment_shader
&& mode
== ir_var_shader_out
)) {
2030 _mesa_glsl_error(loc
, state
,
2031 "interpolation qualifier `%s' cannot be applied to "
2032 "vertex shader inputs or fragment shader outputs",
2033 interpolation_string(interpolation
));
2037 return interpolation
;
2042 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2044 struct _mesa_glsl_parse_state
*state
,
2048 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
2050 if (qual
->flags
.q
.invariant
) {
2052 _mesa_glsl_error(loc
, state
,
2053 "variable `%s' may not be redeclared "
2054 "`invariant' after being used",
2061 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
2062 || qual
->flags
.q
.uniform
2063 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
2066 if (qual
->flags
.q
.centroid
)
2069 if (qual
->flags
.q
.attribute
&& state
->target
!= vertex_shader
) {
2070 var
->type
= glsl_type::error_type
;
2071 _mesa_glsl_error(loc
, state
,
2072 "`attribute' variables may not be declared in the "
2074 _mesa_glsl_shader_target_name(state
->target
));
2077 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2079 * "However, the const qualifier cannot be used with out or inout."
2081 * The same section of the GLSL 4.40 spec further clarifies this saying:
2083 * "The const qualifier cannot be used with out or inout, or a
2084 * compile-time error results."
2086 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2087 _mesa_glsl_error(loc
, state
,
2088 "`const' may not be applied to `out' or `inout' "
2089 "function parameters");
2092 /* If there is no qualifier that changes the mode of the variable, leave
2093 * the setting alone.
2095 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2096 var
->mode
= ir_var_function_inout
;
2097 else if (qual
->flags
.q
.in
)
2098 var
->mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2099 else if (qual
->flags
.q
.attribute
2100 || (qual
->flags
.q
.varying
&& (state
->target
== fragment_shader
)))
2101 var
->mode
= ir_var_shader_in
;
2102 else if (qual
->flags
.q
.out
)
2103 var
->mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2104 else if (qual
->flags
.q
.varying
&& (state
->target
== vertex_shader
))
2105 var
->mode
= ir_var_shader_out
;
2106 else if (qual
->flags
.q
.uniform
)
2107 var
->mode
= ir_var_uniform
;
2109 if (!is_parameter
&& is_varying_var(var
, state
->target
)) {
2110 /* This variable is being used to link data between shader stages (in
2111 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2112 * that is allowed for such purposes.
2114 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2116 * "The varying qualifier can be used only with the data types
2117 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2120 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2121 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2123 * "Fragment inputs can only be signed and unsigned integers and
2124 * integer vectors, float, floating-point vectors, matrices, or
2125 * arrays of these. Structures cannot be input.
2127 * Similar text exists in the section on vertex shader outputs.
2129 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2130 * 3.00 spec allows structs as well. Varying structs are also allowed
2133 switch (var
->type
->get_scalar_type()->base_type
) {
2134 case GLSL_TYPE_FLOAT
:
2135 /* Ok in all GLSL versions */
2137 case GLSL_TYPE_UINT
:
2139 if (state
->is_version(130, 300))
2141 _mesa_glsl_error(loc
, state
,
2142 "varying variables must be of base type float in %s",
2143 state
->get_version_string());
2145 case GLSL_TYPE_STRUCT
:
2146 if (state
->is_version(150, 300))
2148 _mesa_glsl_error(loc
, state
,
2149 "varying variables may not be of type struct");
2152 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2157 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2158 switch (state
->target
) {
2160 if (var
->mode
== ir_var_shader_out
)
2161 var
->invariant
= true;
2163 case geometry_shader
:
2164 if ((var
->mode
== ir_var_shader_in
)
2165 || (var
->mode
== ir_var_shader_out
))
2166 var
->invariant
= true;
2168 case fragment_shader
:
2169 if (var
->mode
== ir_var_shader_in
)
2170 var
->invariant
= true;
2175 var
->interpolation
=
2176 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->mode
,
2179 var
->pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2180 var
->origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2181 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2182 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2183 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2184 ? "origin_upper_left" : "pixel_center_integer";
2186 _mesa_glsl_error(loc
, state
,
2187 "layout qualifier `%s' can only be applied to "
2188 "fragment shader input `gl_FragCoord'",
2192 if (qual
->flags
.q
.explicit_location
) {
2193 const bool global_scope
= (state
->current_function
== NULL
);
2195 const char *string
= "";
2197 /* In the vertex shader only shader inputs can be given explicit
2200 * In the fragment shader only shader outputs can be given explicit
2203 switch (state
->target
) {
2205 if (!global_scope
|| (var
->mode
!= ir_var_shader_in
)) {
2211 case geometry_shader
:
2212 _mesa_glsl_error(loc
, state
,
2213 "geometry shader variables cannot be given "
2214 "explicit locations");
2217 case fragment_shader
:
2218 if (!global_scope
|| (var
->mode
!= ir_var_shader_out
)) {
2226 _mesa_glsl_error(loc
, state
,
2227 "only %s shader %s variables can be given an "
2228 "explicit location",
2229 _mesa_glsl_shader_target_name(state
->target
),
2232 var
->explicit_location
= true;
2234 /* This bit of silliness is needed because invalid explicit locations
2235 * are supposed to be flagged during linking. Small negative values
2236 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2237 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2238 * The linker needs to be able to differentiate these cases. This
2239 * ensures that negative values stay negative.
2241 if (qual
->location
>= 0) {
2242 var
->location
= (state
->target
== vertex_shader
)
2243 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2244 : (qual
->location
+ FRAG_RESULT_DATA0
);
2246 var
->location
= qual
->location
;
2249 if (qual
->flags
.q
.explicit_index
) {
2250 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2251 * Layout Qualifiers):
2253 * "It is also a compile-time error if a fragment shader
2254 * sets a layout index to less than 0 or greater than 1."
2256 * Older specifications don't mandate a behavior; we take
2257 * this as a clarification and always generate the error.
2259 if (qual
->index
< 0 || qual
->index
> 1) {
2260 _mesa_glsl_error(loc
, state
,
2261 "explicit index may only be 0 or 1");
2263 var
->explicit_index
= true;
2264 var
->index
= qual
->index
;
2268 } else if (qual
->flags
.q
.explicit_index
) {
2269 _mesa_glsl_error(loc
, state
,
2270 "explicit index requires explicit location");
2273 if (qual
->flags
.q
.explicit_binding
&&
2274 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2275 var
->explicit_binding
= true;
2276 var
->binding
= qual
->binding
;
2279 /* Does the declaration use the deprecated 'attribute' or 'varying'
2282 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2283 || qual
->flags
.q
.varying
;
2285 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2286 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2287 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2288 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2289 * These extensions and all following extensions that add the 'layout'
2290 * keyword have been modified to require the use of 'in' or 'out'.
2292 * The following extension do not allow the deprecated keywords:
2294 * GL_AMD_conservative_depth
2295 * GL_ARB_conservative_depth
2296 * GL_ARB_gpu_shader5
2297 * GL_ARB_separate_shader_objects
2298 * GL_ARB_tesselation_shader
2299 * GL_ARB_transform_feedback3
2300 * GL_ARB_uniform_buffer_object
2302 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2303 * allow layout with the deprecated keywords.
2305 const bool relaxed_layout_qualifier_checking
=
2306 state
->ARB_fragment_coord_conventions_enable
;
2308 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2309 if (relaxed_layout_qualifier_checking
) {
2310 _mesa_glsl_warning(loc
, state
,
2311 "`layout' qualifier may not be used with "
2312 "`attribute' or `varying'");
2314 _mesa_glsl_error(loc
, state
,
2315 "`layout' qualifier may not be used with "
2316 "`attribute' or `varying'");
2320 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2321 * AMD_conservative_depth.
2323 int depth_layout_count
= qual
->flags
.q
.depth_any
2324 + qual
->flags
.q
.depth_greater
2325 + qual
->flags
.q
.depth_less
2326 + qual
->flags
.q
.depth_unchanged
;
2327 if (depth_layout_count
> 0
2328 && !state
->AMD_conservative_depth_enable
2329 && !state
->ARB_conservative_depth_enable
) {
2330 _mesa_glsl_error(loc
, state
,
2331 "extension GL_AMD_conservative_depth or "
2332 "GL_ARB_conservative_depth must be enabled "
2333 "to use depth layout qualifiers");
2334 } else if (depth_layout_count
> 0
2335 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2336 _mesa_glsl_error(loc
, state
,
2337 "depth layout qualifiers can be applied only to "
2339 } else if (depth_layout_count
> 1
2340 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2341 _mesa_glsl_error(loc
, state
,
2342 "at most one depth layout qualifier can be applied to "
2345 if (qual
->flags
.q
.depth_any
)
2346 var
->depth_layout
= ir_depth_layout_any
;
2347 else if (qual
->flags
.q
.depth_greater
)
2348 var
->depth_layout
= ir_depth_layout_greater
;
2349 else if (qual
->flags
.q
.depth_less
)
2350 var
->depth_layout
= ir_depth_layout_less
;
2351 else if (qual
->flags
.q
.depth_unchanged
)
2352 var
->depth_layout
= ir_depth_layout_unchanged
;
2354 var
->depth_layout
= ir_depth_layout_none
;
2356 if (qual
->flags
.q
.std140
||
2357 qual
->flags
.q
.packed
||
2358 qual
->flags
.q
.shared
) {
2359 _mesa_glsl_error(loc
, state
,
2360 "uniform block layout qualifiers std140, packed, and "
2361 "shared can only be applied to uniform blocks, not "
2365 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2366 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
2371 * Get the variable that is being redeclared by this declaration
2373 * Semantic checks to verify the validity of the redeclaration are also
2374 * performed. If semantic checks fail, compilation error will be emitted via
2375 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2378 * A pointer to an existing variable in the current scope if the declaration
2379 * is a redeclaration, \c NULL otherwise.
2381 static ir_variable
*
2382 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
2383 struct _mesa_glsl_parse_state
*state
,
2384 bool allow_all_redeclarations
)
2386 /* Check if this declaration is actually a re-declaration, either to
2387 * resize an array or add qualifiers to an existing variable.
2389 * This is allowed for variables in the current scope, or when at
2390 * global scope (for built-ins in the implicit outer scope).
2392 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
2393 if (earlier
== NULL
||
2394 (state
->current_function
!= NULL
&&
2395 !state
->symbols
->name_declared_this_scope(var
->name
))) {
2400 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2402 * "It is legal to declare an array without a size and then
2403 * later re-declare the same name as an array of the same
2404 * type and specify a size."
2406 if ((earlier
->type
->array_size() == 0)
2407 && var
->type
->is_array()
2408 && (var
->type
->element_type() == earlier
->type
->element_type())) {
2409 /* FINISHME: This doesn't match the qualifiers on the two
2410 * FINISHME: declarations. It's not 100% clear whether this is
2411 * FINISHME: required or not.
2414 const unsigned size
= unsigned(var
->type
->array_size());
2415 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2416 if ((size
> 0) && (size
<= earlier
->max_array_access
)) {
2417 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2419 earlier
->max_array_access
);
2422 earlier
->type
= var
->type
;
2425 } else if ((state
->ARB_fragment_coord_conventions_enable
||
2426 state
->is_version(150, 0))
2427 && strcmp(var
->name
, "gl_FragCoord") == 0
2428 && earlier
->type
== var
->type
2429 && earlier
->mode
== var
->mode
) {
2430 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2433 earlier
->origin_upper_left
= var
->origin_upper_left
;
2434 earlier
->pixel_center_integer
= var
->pixel_center_integer
;
2436 /* According to section 4.3.7 of the GLSL 1.30 spec,
2437 * the following built-in varaibles can be redeclared with an
2438 * interpolation qualifier:
2441 * * gl_FrontSecondaryColor
2442 * * gl_BackSecondaryColor
2444 * * gl_SecondaryColor
2446 } else if (state
->is_version(130, 0)
2447 && (strcmp(var
->name
, "gl_FrontColor") == 0
2448 || strcmp(var
->name
, "gl_BackColor") == 0
2449 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2450 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2451 || strcmp(var
->name
, "gl_Color") == 0
2452 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2453 && earlier
->type
== var
->type
2454 && earlier
->mode
== var
->mode
) {
2455 earlier
->interpolation
= var
->interpolation
;
2457 /* Layout qualifiers for gl_FragDepth. */
2458 } else if ((state
->AMD_conservative_depth_enable
||
2459 state
->ARB_conservative_depth_enable
)
2460 && strcmp(var
->name
, "gl_FragDepth") == 0
2461 && earlier
->type
== var
->type
2462 && earlier
->mode
== var
->mode
) {
2464 /** From the AMD_conservative_depth spec:
2465 * Within any shader, the first redeclarations of gl_FragDepth
2466 * must appear before any use of gl_FragDepth.
2468 if (earlier
->used
) {
2469 _mesa_glsl_error(&loc
, state
,
2470 "the first redeclaration of gl_FragDepth "
2471 "must appear before any use of gl_FragDepth");
2474 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2475 if (earlier
->depth_layout
!= ir_depth_layout_none
2476 && earlier
->depth_layout
!= var
->depth_layout
) {
2477 _mesa_glsl_error(&loc
, state
,
2478 "gl_FragDepth: depth layout is declared here "
2479 "as '%s, but it was previously declared as "
2481 depth_layout_string(var
->depth_layout
),
2482 depth_layout_string(earlier
->depth_layout
));
2485 earlier
->depth_layout
= var
->depth_layout
;
2487 } else if (allow_all_redeclarations
) {
2488 if (earlier
->mode
!= var
->mode
) {
2489 _mesa_glsl_error(&loc
, state
,
2490 "redeclaration of `%s' with incorrect qualifiers",
2492 } else if (earlier
->type
!= var
->type
) {
2493 _mesa_glsl_error(&loc
, state
,
2494 "redeclaration of `%s' has incorrect type",
2498 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
2505 * Generate the IR for an initializer in a variable declaration
2508 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2509 ast_fully_specified_type
*type
,
2510 exec_list
*initializer_instructions
,
2511 struct _mesa_glsl_parse_state
*state
)
2513 ir_rvalue
*result
= NULL
;
2515 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2517 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2519 * "All uniform variables are read-only and are initialized either
2520 * directly by an application via API commands, or indirectly by
2523 if (var
->mode
== ir_var_uniform
) {
2524 state
->check_version(120, 0, &initializer_loc
,
2525 "cannot initialize uniforms");
2528 if (var
->type
->is_sampler()) {
2529 _mesa_glsl_error(& initializer_loc
, state
,
2530 "cannot initialize samplers");
2533 if ((var
->mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2534 _mesa_glsl_error(& initializer_loc
, state
,
2535 "cannot initialize %s shader input / %s",
2536 _mesa_glsl_shader_target_name(state
->target
),
2537 (state
->target
== vertex_shader
)
2538 ? "attribute" : "varying");
2541 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
2542 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
,
2545 /* Calculate the constant value if this is a const or uniform
2548 if (type
->qualifier
.flags
.q
.constant
2549 || type
->qualifier
.flags
.q
.uniform
) {
2550 ir_rvalue
*new_rhs
= validate_assignment(state
, var
->type
, rhs
, true);
2551 if (new_rhs
!= NULL
) {
2554 ir_constant
*constant_value
= rhs
->constant_expression_value();
2555 if (!constant_value
) {
2556 /* If ARB_shading_language_420pack is enabled, initializers of
2557 * const-qualified local variables do not have to be constant
2558 * expressions. Const-qualified global variables must still be
2559 * initialized with constant expressions.
2561 if (!state
->ARB_shading_language_420pack_enable
2562 || state
->current_function
== NULL
) {
2563 _mesa_glsl_error(& initializer_loc
, state
,
2564 "initializer of %s variable `%s' must be a "
2565 "constant expression",
2566 (type
->qualifier
.flags
.q
.constant
)
2567 ? "const" : "uniform",
2569 if (var
->type
->is_numeric()) {
2570 /* Reduce cascading errors. */
2571 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2575 rhs
= constant_value
;
2576 var
->constant_value
= constant_value
;
2579 _mesa_glsl_error(&initializer_loc
, state
,
2580 "initializer of type %s cannot be assigned to "
2581 "variable of type %s",
2582 rhs
->type
->name
, var
->type
->name
);
2583 if (var
->type
->is_numeric()) {
2584 /* Reduce cascading errors. */
2585 var
->constant_value
= ir_constant::zero(state
, var
->type
);
2590 if (rhs
&& !rhs
->type
->is_error()) {
2591 bool temp
= var
->read_only
;
2592 if (type
->qualifier
.flags
.q
.constant
)
2593 var
->read_only
= false;
2595 /* Never emit code to initialize a uniform.
2597 const glsl_type
*initializer_type
;
2598 if (!type
->qualifier
.flags
.q
.uniform
) {
2599 result
= do_assignment(initializer_instructions
, state
,
2602 type
->get_location());
2603 initializer_type
= result
->type
;
2605 initializer_type
= rhs
->type
;
2607 var
->constant_initializer
= rhs
->constant_expression_value();
2608 var
->has_initializer
= true;
2610 /* If the declared variable is an unsized array, it must inherrit
2611 * its full type from the initializer. A declaration such as
2613 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
2617 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
2619 * The assignment generated in the if-statement (below) will also
2620 * automatically handle this case for non-uniforms.
2622 * If the declared variable is not an array, the types must
2623 * already match exactly. As a result, the type assignment
2624 * here can be done unconditionally. For non-uniforms the call
2625 * to do_assignment can change the type of the initializer (via
2626 * the implicit conversion rules). For uniforms the initializer
2627 * must be a constant expression, and the type of that expression
2628 * was validated above.
2630 var
->type
= initializer_type
;
2632 var
->read_only
= temp
;
2640 * Do additional processing necessary for geometry shader input declarations
2641 * (this covers both interface blocks arrays and bare input variables).
2644 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
2645 YYLTYPE loc
, ir_variable
*var
)
2647 unsigned num_vertices
= 0;
2648 if (state
->gs_input_prim_type_specified
) {
2649 num_vertices
= vertices_per_prim(state
->gs_input_prim_type
);
2652 /* Geometry shader input variables must be arrays. Caller should have
2653 * reported an error for this.
2655 if (!var
->type
->is_array()) {
2656 assert(state
->error
);
2658 /* To avoid cascading failures, short circuit the checks below. */
2662 if (var
->type
->length
== 0) {
2663 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
2665 * All geometry shader input unsized array declarations will be
2666 * sized by an earlier input layout qualifier, when present, as per
2667 * the following table.
2669 * Followed by a table mapping each allowed input layout qualifier to
2670 * the corresponding input length.
2672 if (num_vertices
!= 0)
2673 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
2676 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
2677 * includes the following examples of compile-time errors:
2679 * // code sequence within one shader...
2680 * in vec4 Color1[]; // size unknown
2681 * ...Color1.length()...// illegal, length() unknown
2682 * in vec4 Color2[2]; // size is 2
2683 * ...Color1.length()...// illegal, Color1 still has no size
2684 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
2685 * layout(lines) in; // legal, input size is 2, matching
2686 * in vec4 Color4[3]; // illegal, contradicts layout
2689 * To detect the case illustrated by Color3, we verify that the size of
2690 * an explicitly-sized array matches the size of any previously declared
2691 * explicitly-sized array. To detect the case illustrated by Color4, we
2692 * verify that the size of an explicitly-sized array is consistent with
2693 * any previously declared input layout.
2695 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
2696 _mesa_glsl_error(&loc
, state
,
2697 "geometry shader input size contradicts previously"
2698 " declared layout (size is %u, but layout requires a"
2699 " size of %u)", var
->type
->length
, num_vertices
);
2700 } else if (state
->gs_input_size
!= 0 &&
2701 var
->type
->length
!= state
->gs_input_size
) {
2702 _mesa_glsl_error(&loc
, state
,
2703 "geometry shader input sizes are "
2704 "inconsistent (size is %u, but a previous "
2705 "declaration has size %u)",
2706 var
->type
->length
, state
->gs_input_size
);
2708 state
->gs_input_size
= var
->type
->length
;
2715 validate_identifier(const char *identifier
, YYLTYPE loc
,
2716 struct _mesa_glsl_parse_state
*state
)
2718 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
2720 * "Identifiers starting with "gl_" are reserved for use by
2721 * OpenGL, and may not be declared in a shader as either a
2722 * variable or a function."
2724 if (strncmp(identifier
, "gl_", 3) == 0) {
2725 _mesa_glsl_error(&loc
, state
,
2726 "identifier `%s' uses reserved `gl_' prefix",
2728 } else if (strstr(identifier
, "__")) {
2729 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
2732 * "In addition, all identifiers containing two
2733 * consecutive underscores (__) are reserved as
2734 * possible future keywords."
2736 _mesa_glsl_error(&loc
, state
,
2737 "identifier `%s' uses reserved `__' string",
2744 ast_declarator_list::hir(exec_list
*instructions
,
2745 struct _mesa_glsl_parse_state
*state
)
2748 const struct glsl_type
*decl_type
;
2749 const char *type_name
= NULL
;
2750 ir_rvalue
*result
= NULL
;
2751 YYLTYPE loc
= this->get_location();
2753 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
2755 * "To ensure that a particular output variable is invariant, it is
2756 * necessary to use the invariant qualifier. It can either be used to
2757 * qualify a previously declared variable as being invariant
2759 * invariant gl_Position; // make existing gl_Position be invariant"
2761 * In these cases the parser will set the 'invariant' flag in the declarator
2762 * list, and the type will be NULL.
2764 if (this->invariant
) {
2765 assert(this->type
== NULL
);
2767 if (state
->current_function
!= NULL
) {
2768 _mesa_glsl_error(& loc
, state
,
2769 "all uses of `invariant' keyword must be at global "
2773 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2774 assert(!decl
->is_array
);
2775 assert(decl
->array_size
== NULL
);
2776 assert(decl
->initializer
== NULL
);
2778 ir_variable
*const earlier
=
2779 state
->symbols
->get_variable(decl
->identifier
);
2780 if (earlier
== NULL
) {
2781 _mesa_glsl_error(& loc
, state
,
2782 "undeclared variable `%s' cannot be marked "
2783 "invariant", decl
->identifier
);
2784 } else if ((state
->target
== vertex_shader
)
2785 && (earlier
->mode
!= ir_var_shader_out
)) {
2786 _mesa_glsl_error(& loc
, state
,
2787 "`%s' cannot be marked invariant, vertex shader "
2788 "outputs only", decl
->identifier
);
2789 } else if ((state
->target
== fragment_shader
)
2790 && (earlier
->mode
!= ir_var_shader_in
)) {
2791 _mesa_glsl_error(& loc
, state
,
2792 "`%s' cannot be marked invariant, fragment shader "
2793 "inputs only", decl
->identifier
);
2794 } else if (earlier
->used
) {
2795 _mesa_glsl_error(& loc
, state
,
2796 "variable `%s' may not be redeclared "
2797 "`invariant' after being used",
2800 earlier
->invariant
= true;
2804 /* Invariant redeclarations do not have r-values.
2809 assert(this->type
!= NULL
);
2810 assert(!this->invariant
);
2812 /* The type specifier may contain a structure definition. Process that
2813 * before any of the variable declarations.
2815 (void) this->type
->specifier
->hir(instructions
, state
);
2817 decl_type
= this->type
->glsl_type(& type_name
, state
);
2818 if (this->declarations
.is_empty()) {
2819 /* If there is no structure involved in the program text, there are two
2820 * possible scenarios:
2822 * - The program text contained something like 'vec4;'. This is an
2823 * empty declaration. It is valid but weird. Emit a warning.
2825 * - The program text contained something like 'S;' and 'S' is not the
2826 * name of a known structure type. This is both invalid and weird.
2829 * - The program text contained something like 'mediump float;'
2830 * when the programmer probably meant 'precision mediump
2831 * float;' Emit a warning with a description of what they
2832 * probably meant to do.
2834 * Note that if decl_type is NULL and there is a structure involved,
2835 * there must have been some sort of error with the structure. In this
2836 * case we assume that an error was already generated on this line of
2837 * code for the structure. There is no need to generate an additional,
2840 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
2843 if (decl_type
== NULL
) {
2844 _mesa_glsl_error(&loc
, state
,
2845 "invalid type `%s' in empty declaration",
2847 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
2848 if (this->type
->specifier
->structure
!= NULL
) {
2849 _mesa_glsl_error(&loc
, state
,
2850 "precision qualifiers can't be applied "
2853 static const char *const precision_names
[] = {
2860 _mesa_glsl_warning(&loc
, state
,
2861 "empty declaration with precision qualifier, "
2862 "to set the default precision, use "
2863 "`precision %s %s;'",
2864 precision_names
[this->type
->qualifier
.precision
],
2868 _mesa_glsl_warning(&loc
, state
, "empty declaration");
2872 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
2873 const struct glsl_type
*var_type
;
2876 /* FINISHME: Emit a warning if a variable declaration shadows a
2877 * FINISHME: declaration at a higher scope.
2880 if ((decl_type
== NULL
) || decl_type
->is_void()) {
2881 if (type_name
!= NULL
) {
2882 _mesa_glsl_error(& loc
, state
,
2883 "invalid type `%s' in declaration of `%s'",
2884 type_name
, decl
->identifier
);
2886 _mesa_glsl_error(& loc
, state
,
2887 "invalid type in declaration of `%s'",
2893 if (decl
->is_array
) {
2894 var_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
2896 if (var_type
->is_error())
2899 var_type
= decl_type
;
2902 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
2904 /* The 'varying in' and 'varying out' qualifiers can only be used with
2905 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
2908 if (this->type
->qualifier
.flags
.q
.varying
) {
2909 if (this->type
->qualifier
.flags
.q
.in
) {
2910 _mesa_glsl_error(& loc
, state
,
2911 "`varying in' qualifier in declaration of "
2912 "`%s' only valid for geometry shaders using "
2913 "ARB_geometry_shader4 or EXT_geometry_shader4",
2915 } else if (this->type
->qualifier
.flags
.q
.out
) {
2916 _mesa_glsl_error(& loc
, state
,
2917 "`varying out' qualifier in declaration of "
2918 "`%s' only valid for geometry shaders using "
2919 "ARB_geometry_shader4 or EXT_geometry_shader4",
2924 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
2926 * "Global variables can only use the qualifiers const,
2927 * attribute, uni form, or varying. Only one may be
2930 * Local variables can only use the qualifier const."
2932 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
2933 * any extension that adds the 'layout' keyword.
2935 if (!state
->is_version(130, 300)
2936 && !state
->has_explicit_attrib_location()
2937 && !state
->ARB_fragment_coord_conventions_enable
) {
2938 if (this->type
->qualifier
.flags
.q
.out
) {
2939 _mesa_glsl_error(& loc
, state
,
2940 "`out' qualifier in declaration of `%s' "
2941 "only valid for function parameters in %s",
2942 decl
->identifier
, state
->get_version_string());
2944 if (this->type
->qualifier
.flags
.q
.in
) {
2945 _mesa_glsl_error(& loc
, state
,
2946 "`in' qualifier in declaration of `%s' "
2947 "only valid for function parameters in %s",
2948 decl
->identifier
, state
->get_version_string());
2950 /* FINISHME: Test for other invalid qualifiers. */
2953 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
2956 if (this->type
->qualifier
.flags
.q
.invariant
) {
2957 if ((state
->target
== vertex_shader
) &&
2958 var
->mode
!= ir_var_shader_out
) {
2959 _mesa_glsl_error(& loc
, state
,
2960 "`%s' cannot be marked invariant, vertex shader "
2961 "outputs only", var
->name
);
2962 } else if ((state
->target
== fragment_shader
) &&
2963 var
->mode
!= ir_var_shader_in
) {
2964 /* FINISHME: Note that this doesn't work for invariant on
2965 * a function signature inval
2967 _mesa_glsl_error(& loc
, state
,
2968 "`%s' cannot be marked invariant, fragment shader "
2969 "inputs only", var
->name
);
2973 if (state
->current_function
!= NULL
) {
2974 const char *mode
= NULL
;
2975 const char *extra
= "";
2977 /* There is no need to check for 'inout' here because the parser will
2978 * only allow that in function parameter lists.
2980 if (this->type
->qualifier
.flags
.q
.attribute
) {
2982 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
2984 } else if (this->type
->qualifier
.flags
.q
.varying
) {
2986 } else if (this->type
->qualifier
.flags
.q
.in
) {
2988 extra
= " or in function parameter list";
2989 } else if (this->type
->qualifier
.flags
.q
.out
) {
2991 extra
= " or in function parameter list";
2995 _mesa_glsl_error(& loc
, state
,
2996 "%s variable `%s' must be declared at "
2998 mode
, var
->name
, extra
);
3000 } else if (var
->mode
== ir_var_shader_in
) {
3001 var
->read_only
= true;
3003 if (state
->target
== vertex_shader
) {
3004 bool error_emitted
= false;
3006 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
3008 * "Vertex shader inputs can only be float, floating-point
3009 * vectors, matrices, signed and unsigned integers and integer
3010 * vectors. Vertex shader inputs can also form arrays of these
3011 * types, but not structures."
3013 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
3015 * "Vertex shader inputs can only be float, floating-point
3016 * vectors, matrices, signed and unsigned integers and integer
3017 * vectors. They cannot be arrays or structures."
3019 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
3021 * "The attribute qualifier can be used only with float,
3022 * floating-point vectors, and matrices. Attribute variables
3023 * cannot be declared as arrays or structures."
3025 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
3027 * "Vertex shader inputs can only be float, floating-point
3028 * vectors, matrices, signed and unsigned integers and integer
3029 * vectors. Vertex shader inputs cannot be arrays or
3032 const glsl_type
*check_type
= var
->type
->is_array()
3033 ? var
->type
->fields
.array
: var
->type
;
3035 switch (check_type
->base_type
) {
3036 case GLSL_TYPE_FLOAT
:
3038 case GLSL_TYPE_UINT
:
3040 if (state
->is_version(120, 300))
3044 _mesa_glsl_error(& loc
, state
,
3045 "vertex shader input / attribute cannot have "
3047 var
->type
->is_array() ? "array of " : "",
3049 error_emitted
= true;
3052 if (!error_emitted
&& var
->type
->is_array() &&
3053 !state
->check_version(150, 0, &loc
,
3054 "vertex shader input / attribute "
3055 "cannot have array type")) {
3056 error_emitted
= true;
3058 } else if (state
->target
== geometry_shader
) {
3059 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3061 * Geometry shader input variables get the per-vertex values
3062 * written out by vertex shader output variables of the same
3063 * names. Since a geometry shader operates on a set of
3064 * vertices, each input varying variable (or input block, see
3065 * interface blocks below) needs to be declared as an array.
3067 if (!var
->type
->is_array()) {
3068 _mesa_glsl_error(&loc
, state
,
3069 "geometry shader inputs must be arrays");
3072 handle_geometry_shader_input_decl(state
, loc
, var
);
3076 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
3077 * so must integer vertex outputs.
3079 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
3080 * "Fragment shader inputs that are signed or unsigned integers or
3081 * integer vectors must be qualified with the interpolation qualifier
3084 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3085 * "Fragment shader inputs that are, or contain, signed or unsigned
3086 * integers or integer vectors must be qualified with the
3087 * interpolation qualifier flat."
3089 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3090 * "Vertex shader outputs that are, or contain, signed or unsigned
3091 * integers or integer vectors must be qualified with the
3092 * interpolation qualifier flat."
3094 * Note that prior to GLSL 1.50, this requirement applied to vertex
3095 * outputs rather than fragment inputs. That creates problems in the
3096 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3097 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3098 * apply the restriction to both vertex outputs and fragment inputs.
3100 * Note also that the desktop GLSL specs are missing the text "or
3101 * contain"; this is presumably an oversight, since there is no
3102 * reasonable way to interpolate a fragment shader input that contains
3105 if (state
->is_version(130, 300) &&
3106 var
->type
->contains_integer() &&
3107 var
->interpolation
!= INTERP_QUALIFIER_FLAT
&&
3108 ((state
->target
== fragment_shader
&& var
->mode
== ir_var_shader_in
)
3109 || (state
->target
== vertex_shader
&& var
->mode
== ir_var_shader_out
3110 && state
->es_shader
))) {
3111 const char *var_type
= (state
->target
== vertex_shader
) ?
3112 "vertex output" : "fragment input";
3113 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
3114 "an integer, then it must be qualified with 'flat'",
3119 /* Interpolation qualifiers cannot be applied to 'centroid' and
3120 * 'centroid varying'.
3122 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3123 * "interpolation qualifiers may only precede the qualifiers in,
3124 * centroid in, out, or centroid out in a declaration. They do not apply
3125 * to the deprecated storage qualifiers varying or centroid varying."
3127 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3129 if (state
->is_version(130, 0)
3130 && this->type
->qualifier
.has_interpolation()
3131 && this->type
->qualifier
.flags
.q
.varying
) {
3133 const char *i
= this->type
->qualifier
.interpolation_string();
3136 if (this->type
->qualifier
.flags
.q
.centroid
)
3137 s
= "centroid varying";
3141 _mesa_glsl_error(&loc
, state
,
3142 "qualifier '%s' cannot be applied to the "
3143 "deprecated storage qualifier '%s'", i
, s
);
3147 /* Interpolation qualifiers can only apply to vertex shader outputs and
3148 * fragment shader inputs.
3150 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3151 * "Outputs from a vertex shader (out) and inputs to a fragment
3152 * shader (in) can be further qualified with one or more of these
3153 * interpolation qualifiers"
3155 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
3156 * "These interpolation qualifiers may only precede the qualifiers
3157 * in, centroid in, out, or centroid out in a declaration. They do
3158 * not apply to inputs into a vertex shader or outputs from a
3161 if (state
->is_version(130, 300)
3162 && this->type
->qualifier
.has_interpolation()) {
3164 const char *i
= this->type
->qualifier
.interpolation_string();
3167 switch (state
->target
) {
3169 if (this->type
->qualifier
.flags
.q
.in
) {
3170 _mesa_glsl_error(&loc
, state
,
3171 "qualifier '%s' cannot be applied to vertex "
3172 "shader inputs", i
);
3175 case fragment_shader
:
3176 if (this->type
->qualifier
.flags
.q
.out
) {
3177 _mesa_glsl_error(&loc
, state
,
3178 "qualifier '%s' cannot be applied to fragment "
3179 "shader outputs", i
);
3188 /* From section 4.3.4 of the GLSL 1.30 spec:
3189 * "It is an error to use centroid in in a vertex shader."
3191 * From section 4.3.4 of the GLSL ES 3.00 spec:
3192 * "It is an error to use centroid in or interpolation qualifiers in
3193 * a vertex shader input."
3195 if (state
->is_version(130, 300)
3196 && this->type
->qualifier
.flags
.q
.centroid
3197 && this->type
->qualifier
.flags
.q
.in
3198 && state
->target
== vertex_shader
) {
3200 _mesa_glsl_error(&loc
, state
,
3201 "'centroid in' cannot be used in a vertex shader");
3204 /* Section 4.3.6 of the GLSL 1.30 specification states:
3205 * "It is an error to use centroid out in a fragment shader."
3207 * The GL_ARB_shading_language_420pack extension specification states:
3208 * "It is an error to use auxiliary storage qualifiers or interpolation
3209 * qualifiers on an output in a fragment shader."
3211 if (state
->target
== fragment_shader
&&
3212 this->type
->qualifier
.flags
.q
.out
&&
3213 this->type
->qualifier
.has_auxiliary_storage()) {
3214 _mesa_glsl_error(&loc
, state
,
3215 "auxiliary storage qualifiers cannot be used on "
3216 "fragment shader outputs");
3219 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
3221 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3222 state
->check_precision_qualifiers_allowed(&loc
);
3226 /* Precision qualifiers apply to floating point, integer and sampler
3229 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3230 * "Any floating point or any integer declaration can have the type
3231 * preceded by one of these precision qualifiers [...] Literal
3232 * constants do not have precision qualifiers. Neither do Boolean
3235 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3238 * "Precision qualifiers are added for code portability with OpenGL
3239 * ES, not for functionality. They have the same syntax as in OpenGL
3242 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3244 * "uniform lowp sampler2D sampler;
3247 * lowp vec4 col = texture2D (sampler, coord);
3248 * // texture2D returns lowp"
3250 * From this, we infer that GLSL 1.30 (and later) should allow precision
3251 * qualifiers on sampler types just like float and integer types.
3253 if (this->type
->qualifier
.precision
!= ast_precision_none
3254 && !var
->type
->is_float()
3255 && !var
->type
->is_integer()
3256 && !var
->type
->is_record()
3257 && !var
->type
->is_sampler()
3258 && !(var
->type
->is_array()
3259 && (var
->type
->fields
.array
->is_float()
3260 || var
->type
->fields
.array
->is_integer()))) {
3262 _mesa_glsl_error(&loc
, state
,
3263 "precision qualifiers apply only to floating point"
3264 ", integer and sampler types");
3267 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3269 * "[Sampler types] can only be declared as function
3270 * parameters or uniform variables (see Section 4.3.5
3273 if (var_type
->contains_sampler() &&
3274 !this->type
->qualifier
.flags
.q
.uniform
) {
3275 _mesa_glsl_error(&loc
, state
, "samplers must be declared uniform");
3278 /* Process the initializer and add its instructions to a temporary
3279 * list. This list will be added to the instruction stream (below) after
3280 * the declaration is added. This is done because in some cases (such as
3281 * redeclarations) the declaration may not actually be added to the
3282 * instruction stream.
3284 exec_list initializer_instructions
;
3285 ir_variable
*earlier
=
3286 get_variable_being_redeclared(var
, decl
->get_location(), state
,
3287 false /* allow_all_redeclarations */);
3289 if (decl
->initializer
!= NULL
) {
3290 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3292 &initializer_instructions
, state
);
3295 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3297 * "It is an error to write to a const variable outside of
3298 * its declaration, so they must be initialized when
3301 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3302 _mesa_glsl_error(& loc
, state
,
3303 "const declaration of `%s' must be initialized",
3307 if (state
->es_shader
) {
3308 const glsl_type
*const t
= (earlier
== NULL
)
3309 ? var
->type
: earlier
->type
;
3311 if (t
->is_array() && t
->length
== 0)
3312 /* Section 10.17 of the GLSL ES 1.00 specification states that
3313 * unsized array declarations have been removed from the language.
3314 * Arrays that are sized using an initializer are still explicitly
3315 * sized. However, GLSL ES 1.00 does not allow array
3316 * initializers. That is only allowed in GLSL ES 3.00.
3318 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
3320 * "An array type can also be formed without specifying a size
3321 * if the definition includes an initializer:
3323 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
3324 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
3329 _mesa_glsl_error(& loc
, state
,
3330 "unsized array declarations are not allowed in "
3334 /* If the declaration is not a redeclaration, there are a few additional
3335 * semantic checks that must be applied. In addition, variable that was
3336 * created for the declaration should be added to the IR stream.
3338 if (earlier
== NULL
) {
3339 validate_identifier(decl
->identifier
, loc
, state
);
3341 /* Add the variable to the symbol table. Note that the initializer's
3342 * IR was already processed earlier (though it hasn't been emitted
3343 * yet), without the variable in scope.
3345 * This differs from most C-like languages, but it follows the GLSL
3346 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3349 * "Within a declaration, the scope of a name starts immediately
3350 * after the initializer if present or immediately after the name
3351 * being declared if not."
3353 if (!state
->symbols
->add_variable(var
)) {
3354 YYLTYPE loc
= this->get_location();
3355 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
3356 "current scope", decl
->identifier
);
3360 /* Push the variable declaration to the top. It means that all the
3361 * variable declarations will appear in a funny last-to-first order,
3362 * but otherwise we run into trouble if a function is prototyped, a
3363 * global var is decled, then the function is defined with usage of
3364 * the global var. See glslparsertest's CorrectModule.frag.
3366 instructions
->push_head(var
);
3369 instructions
->append_list(&initializer_instructions
);
3373 /* Generally, variable declarations do not have r-values. However,
3374 * one is used for the declaration in
3376 * while (bool b = some_condition()) {
3380 * so we return the rvalue from the last seen declaration here.
3387 ast_parameter_declarator::hir(exec_list
*instructions
,
3388 struct _mesa_glsl_parse_state
*state
)
3391 const struct glsl_type
*type
;
3392 const char *name
= NULL
;
3393 YYLTYPE loc
= this->get_location();
3395 type
= this->type
->glsl_type(& name
, state
);
3399 _mesa_glsl_error(& loc
, state
,
3400 "invalid type `%s' in declaration of `%s'",
3401 name
, this->identifier
);
3403 _mesa_glsl_error(& loc
, state
,
3404 "invalid type in declaration of `%s'",
3408 type
= glsl_type::error_type
;
3411 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
3413 * "Functions that accept no input arguments need not use void in the
3414 * argument list because prototypes (or definitions) are required and
3415 * therefore there is no ambiguity when an empty argument list "( )" is
3416 * declared. The idiom "(void)" as a parameter list is provided for
3419 * Placing this check here prevents a void parameter being set up
3420 * for a function, which avoids tripping up checks for main taking
3421 * parameters and lookups of an unnamed symbol.
3423 if (type
->is_void()) {
3424 if (this->identifier
!= NULL
)
3425 _mesa_glsl_error(& loc
, state
,
3426 "named parameter cannot have type `void'");
3432 if (formal_parameter
&& (this->identifier
== NULL
)) {
3433 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
3437 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
3438 * call already handled the "vec4[..] foo" case.
3440 if (this->is_array
) {
3441 type
= process_array_type(&loc
, type
, this->array_size
, state
);
3444 if (!type
->is_error() && type
->array_size() == 0) {
3445 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
3447 type
= glsl_type::error_type
;
3451 ir_variable
*var
= new(ctx
)
3452 ir_variable(type
, this->identifier
, ir_var_function_in
);
3454 /* Apply any specified qualifiers to the parameter declaration. Note that
3455 * for function parameters the default mode is 'in'.
3457 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
3460 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3462 * "Samplers cannot be treated as l-values; hence cannot be used
3463 * as out or inout function parameters, nor can they be assigned
3466 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3467 && type
->contains_sampler()) {
3468 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot contain samplers");
3469 type
= glsl_type::error_type
;
3472 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
3474 * "When calling a function, expressions that do not evaluate to
3475 * l-values cannot be passed to parameters declared as out or inout."
3477 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
3479 * "Other binary or unary expressions, non-dereferenced arrays,
3480 * function names, swizzles with repeated fields, and constants
3481 * cannot be l-values."
3483 * So for GLSL 1.10, passing an array as an out or inout parameter is not
3484 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
3486 if ((var
->mode
== ir_var_function_inout
|| var
->mode
== ir_var_function_out
)
3488 && !state
->check_version(120, 100, &loc
,
3489 "arrays cannot be out or inout parameters")) {
3490 type
= glsl_type::error_type
;
3493 instructions
->push_tail(var
);
3495 /* Parameter declarations do not have r-values.
3502 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
3504 exec_list
*ir_parameters
,
3505 _mesa_glsl_parse_state
*state
)
3507 ast_parameter_declarator
*void_param
= NULL
;
3510 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
3511 param
->formal_parameter
= formal
;
3512 param
->hir(ir_parameters
, state
);
3520 if ((void_param
!= NULL
) && (count
> 1)) {
3521 YYLTYPE loc
= void_param
->get_location();
3523 _mesa_glsl_error(& loc
, state
,
3524 "`void' parameter must be only parameter");
3530 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
3532 /* IR invariants disallow function declarations or definitions
3533 * nested within other function definitions. But there is no
3534 * requirement about the relative order of function declarations
3535 * and definitions with respect to one another. So simply insert
3536 * the new ir_function block at the end of the toplevel instruction
3539 state
->toplevel_ir
->push_tail(f
);
3544 ast_function::hir(exec_list
*instructions
,
3545 struct _mesa_glsl_parse_state
*state
)
3548 ir_function
*f
= NULL
;
3549 ir_function_signature
*sig
= NULL
;
3550 exec_list hir_parameters
;
3552 const char *const name
= identifier
;
3554 /* New functions are always added to the top-level IR instruction stream,
3555 * so this instruction list pointer is ignored. See also emit_function
3558 (void) instructions
;
3560 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
3562 * "Function declarations (prototypes) cannot occur inside of functions;
3563 * they must be at global scope, or for the built-in functions, outside
3564 * the global scope."
3566 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
3568 * "User defined functions may only be defined within the global scope."
3570 * Note that this language does not appear in GLSL 1.10.
3572 if ((state
->current_function
!= NULL
) &&
3573 state
->is_version(120, 100)) {
3574 YYLTYPE loc
= this->get_location();
3575 _mesa_glsl_error(&loc
, state
,
3576 "declaration of function `%s' not allowed within "
3577 "function body", name
);
3580 validate_identifier(name
, this->get_location(), state
);
3582 /* Convert the list of function parameters to HIR now so that they can be
3583 * used below to compare this function's signature with previously seen
3584 * signatures for functions with the same name.
3586 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
3588 & hir_parameters
, state
);
3590 const char *return_type_name
;
3591 const glsl_type
*return_type
=
3592 this->return_type
->glsl_type(& return_type_name
, state
);
3595 YYLTYPE loc
= this->get_location();
3596 _mesa_glsl_error(&loc
, state
,
3597 "function `%s' has undeclared return type `%s'",
3598 name
, return_type_name
);
3599 return_type
= glsl_type::error_type
;
3602 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
3603 * "No qualifier is allowed on the return type of a function."
3605 if (this->return_type
->has_qualifiers()) {
3606 YYLTYPE loc
= this->get_location();
3607 _mesa_glsl_error(& loc
, state
,
3608 "function `%s' return type has qualifiers", name
);
3611 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
3613 * "Arrays are allowed as arguments and as the return type. In both
3614 * cases, the array must be explicitly sized."
3616 if (return_type
->is_array() && return_type
->length
== 0) {
3617 YYLTYPE loc
= this->get_location();
3618 _mesa_glsl_error(& loc
, state
,
3619 "function `%s' return type array must be explicitly "
3623 /* From page 17 (page 23 of the PDF) of the GLSL 1.20 spec:
3625 * "[Sampler types] can only be declared as function parameters
3626 * or uniform variables (see Section 4.3.5 "Uniform")".
3628 if (return_type
->contains_sampler()) {
3629 YYLTYPE loc
= this->get_location();
3630 _mesa_glsl_error(&loc
, state
,
3631 "function `%s' return type can't contain a sampler",
3635 /* Verify that this function's signature either doesn't match a previously
3636 * seen signature for a function with the same name, or, if a match is found,
3637 * that the previously seen signature does not have an associated definition.
3639 f
= state
->symbols
->get_function(name
);
3640 if (f
!= NULL
&& (state
->es_shader
|| f
->has_user_signature())) {
3641 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
3643 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
3644 if (badvar
!= NULL
) {
3645 YYLTYPE loc
= this->get_location();
3647 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
3648 "qualifiers don't match prototype", name
, badvar
);
3651 if (sig
->return_type
!= return_type
) {
3652 YYLTYPE loc
= this->get_location();
3654 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
3655 "match prototype", name
);
3658 if (sig
->is_defined
) {
3659 if (is_definition
) {
3660 YYLTYPE loc
= this->get_location();
3661 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
3663 /* We just encountered a prototype that exactly matches a
3664 * function that's already been defined. This is redundant,
3665 * and we should ignore it.
3672 f
= new(ctx
) ir_function(name
);
3673 if (!state
->symbols
->add_function(f
)) {
3674 /* This function name shadows a non-function use of the same name. */
3675 YYLTYPE loc
= this->get_location();
3677 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
3678 "non-function", name
);
3682 emit_function(state
, f
);
3685 /* Verify the return type of main() */
3686 if (strcmp(name
, "main") == 0) {
3687 if (! return_type
->is_void()) {
3688 YYLTYPE loc
= this->get_location();
3690 _mesa_glsl_error(& loc
, state
, "main() must return void");
3693 if (!hir_parameters
.is_empty()) {
3694 YYLTYPE loc
= this->get_location();
3696 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
3700 /* Finish storing the information about this new function in its signature.
3703 sig
= new(ctx
) ir_function_signature(return_type
);
3704 f
->add_signature(sig
);
3707 sig
->replace_parameters(&hir_parameters
);
3710 /* Function declarations (prototypes) do not have r-values.
3717 ast_function_definition::hir(exec_list
*instructions
,
3718 struct _mesa_glsl_parse_state
*state
)
3720 prototype
->is_definition
= true;
3721 prototype
->hir(instructions
, state
);
3723 ir_function_signature
*signature
= prototype
->signature
;
3724 if (signature
== NULL
)
3727 assert(state
->current_function
== NULL
);
3728 state
->current_function
= signature
;
3729 state
->found_return
= false;
3731 /* Duplicate parameters declared in the prototype as concrete variables.
3732 * Add these to the symbol table.
3734 state
->symbols
->push_scope();
3735 foreach_iter(exec_list_iterator
, iter
, signature
->parameters
) {
3736 ir_variable
*const var
= ((ir_instruction
*) iter
.get())->as_variable();
3738 assert(var
!= NULL
);
3740 /* The only way a parameter would "exist" is if two parameters have
3743 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
3744 YYLTYPE loc
= this->get_location();
3746 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
3748 state
->symbols
->add_variable(var
);
3752 /* Convert the body of the function to HIR. */
3753 this->body
->hir(&signature
->body
, state
);
3754 signature
->is_defined
= true;
3756 state
->symbols
->pop_scope();
3758 assert(state
->current_function
== signature
);
3759 state
->current_function
= NULL
;
3761 if (!signature
->return_type
->is_void() && !state
->found_return
) {
3762 YYLTYPE loc
= this->get_location();
3763 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
3764 "%s, but no return statement",
3765 signature
->function_name(),
3766 signature
->return_type
->name
);
3769 /* Function definitions do not have r-values.
3776 ast_jump_statement::hir(exec_list
*instructions
,
3777 struct _mesa_glsl_parse_state
*state
)
3784 assert(state
->current_function
);
3786 if (opt_return_value
) {
3787 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
3789 /* The value of the return type can be NULL if the shader says
3790 * 'return foo();' and foo() is a function that returns void.
3792 * NOTE: The GLSL spec doesn't say that this is an error. The type
3793 * of the return value is void. If the return type of the function is
3794 * also void, then this should compile without error. Seriously.
3796 const glsl_type
*const ret_type
=
3797 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
3799 /* Implicit conversions are not allowed for return values prior to
3800 * ARB_shading_language_420pack.
3802 if (state
->current_function
->return_type
!= ret_type
) {
3803 YYLTYPE loc
= this->get_location();
3805 if (state
->ARB_shading_language_420pack_enable
) {
3806 if (!apply_implicit_conversion(state
->current_function
->return_type
,
3808 _mesa_glsl_error(& loc
, state
,
3809 "could not implicitly convert return value "
3810 "to %s, in function `%s'",
3811 state
->current_function
->return_type
->name
,
3812 state
->current_function
->function_name());
3815 _mesa_glsl_error(& loc
, state
,
3816 "`return' with wrong type %s, in function `%s' "
3819 state
->current_function
->function_name(),
3820 state
->current_function
->return_type
->name
);
3822 } else if (state
->current_function
->return_type
->base_type
==
3824 YYLTYPE loc
= this->get_location();
3826 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
3827 * specs add a clarification:
3829 * "A void function can only use return without a return argument, even if
3830 * the return argument has void type. Return statements only accept values:
3833 * void func2() { return func1(); } // illegal return statement"
3835 _mesa_glsl_error(& loc
, state
,
3836 "void functions can only use `return' without a "
3840 inst
= new(ctx
) ir_return(ret
);
3842 if (state
->current_function
->return_type
->base_type
!=
3844 YYLTYPE loc
= this->get_location();
3846 _mesa_glsl_error(& loc
, state
,
3847 "`return' with no value, in function %s returning "
3849 state
->current_function
->function_name());
3851 inst
= new(ctx
) ir_return
;
3854 state
->found_return
= true;
3855 instructions
->push_tail(inst
);
3860 if (state
->target
!= fragment_shader
) {
3861 YYLTYPE loc
= this->get_location();
3863 _mesa_glsl_error(& loc
, state
,
3864 "`discard' may only appear in a fragment shader");
3866 instructions
->push_tail(new(ctx
) ir_discard
);
3871 if (mode
== ast_continue
&&
3872 state
->loop_nesting_ast
== NULL
) {
3873 YYLTYPE loc
= this->get_location();
3875 _mesa_glsl_error(& loc
, state
,
3876 "continue may only appear in a loop");
3877 } else if (mode
== ast_break
&&
3878 state
->loop_nesting_ast
== NULL
&&
3879 state
->switch_state
.switch_nesting_ast
== NULL
) {
3880 YYLTYPE loc
= this->get_location();
3882 _mesa_glsl_error(& loc
, state
,
3883 "break may only appear in a loop or a switch");
3885 /* For a loop, inline the for loop expression again,
3886 * since we don't know where near the end of
3887 * the loop body the normal copy of it
3888 * is going to be placed.
3890 if (state
->loop_nesting_ast
!= NULL
&&
3891 mode
== ast_continue
&&
3892 state
->loop_nesting_ast
->rest_expression
) {
3893 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
3897 if (state
->switch_state
.is_switch_innermost
&&
3898 mode
== ast_break
) {
3899 /* Force break out of switch by setting is_break switch state.
3901 ir_variable
*const is_break_var
= state
->switch_state
.is_break_var
;
3902 ir_dereference_variable
*const deref_is_break_var
=
3903 new(ctx
) ir_dereference_variable(is_break_var
);
3904 ir_constant
*const true_val
= new(ctx
) ir_constant(true);
3905 ir_assignment
*const set_break_var
=
3906 new(ctx
) ir_assignment(deref_is_break_var
, true_val
);
3908 instructions
->push_tail(set_break_var
);
3911 ir_loop_jump
*const jump
=
3912 new(ctx
) ir_loop_jump((mode
== ast_break
)
3913 ? ir_loop_jump::jump_break
3914 : ir_loop_jump::jump_continue
);
3915 instructions
->push_tail(jump
);
3922 /* Jump instructions do not have r-values.
3929 ast_selection_statement::hir(exec_list
*instructions
,
3930 struct _mesa_glsl_parse_state
*state
)
3934 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
3936 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
3938 * "Any expression whose type evaluates to a Boolean can be used as the
3939 * conditional expression bool-expression. Vector types are not accepted
3940 * as the expression to if."
3942 * The checks are separated so that higher quality diagnostics can be
3943 * generated for cases where both rules are violated.
3945 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
3946 YYLTYPE loc
= this->condition
->get_location();
3948 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
3952 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
3954 if (then_statement
!= NULL
) {
3955 state
->symbols
->push_scope();
3956 then_statement
->hir(& stmt
->then_instructions
, state
);
3957 state
->symbols
->pop_scope();
3960 if (else_statement
!= NULL
) {
3961 state
->symbols
->push_scope();
3962 else_statement
->hir(& stmt
->else_instructions
, state
);
3963 state
->symbols
->pop_scope();
3966 instructions
->push_tail(stmt
);
3968 /* if-statements do not have r-values.
3975 ast_switch_statement::hir(exec_list
*instructions
,
3976 struct _mesa_glsl_parse_state
*state
)
3980 ir_rvalue
*const test_expression
=
3981 this->test_expression
->hir(instructions
, state
);
3983 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
3985 * "The type of init-expression in a switch statement must be a
3988 if (!test_expression
->type
->is_scalar() ||
3989 !test_expression
->type
->is_integer()) {
3990 YYLTYPE loc
= this->test_expression
->get_location();
3992 _mesa_glsl_error(& loc
,
3994 "switch-statement expression must be scalar "
3998 /* Track the switch-statement nesting in a stack-like manner.
4000 struct glsl_switch_state saved
= state
->switch_state
;
4002 state
->switch_state
.is_switch_innermost
= true;
4003 state
->switch_state
.switch_nesting_ast
= this;
4004 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
4005 hash_table_pointer_compare
);
4006 state
->switch_state
.previous_default
= NULL
;
4008 /* Initalize is_fallthru state to false.
4010 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
4011 state
->switch_state
.is_fallthru_var
=
4012 new(ctx
) ir_variable(glsl_type::bool_type
,
4013 "switch_is_fallthru_tmp",
4015 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
4017 ir_dereference_variable
*deref_is_fallthru_var
=
4018 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4019 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
4022 /* Initalize is_break state to false.
4024 ir_rvalue
*const is_break_val
= new (ctx
) ir_constant(false);
4025 state
->switch_state
.is_break_var
= new(ctx
) ir_variable(glsl_type::bool_type
,
4026 "switch_is_break_tmp",
4028 instructions
->push_tail(state
->switch_state
.is_break_var
);
4030 ir_dereference_variable
*deref_is_break_var
=
4031 new(ctx
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4032 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_break_var
,
4035 /* Cache test expression.
4037 test_to_hir(instructions
, state
);
4039 /* Emit code for body of switch stmt.
4041 body
->hir(instructions
, state
);
4043 hash_table_dtor(state
->switch_state
.labels_ht
);
4045 state
->switch_state
= saved
;
4047 /* Switch statements do not have r-values. */
4053 ast_switch_statement::test_to_hir(exec_list
*instructions
,
4054 struct _mesa_glsl_parse_state
*state
)
4058 /* Cache value of test expression. */
4059 ir_rvalue
*const test_val
=
4060 test_expression
->hir(instructions
,
4063 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
4066 ir_dereference_variable
*deref_test_var
=
4067 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4069 instructions
->push_tail(state
->switch_state
.test_var
);
4070 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
4075 ast_switch_body::hir(exec_list
*instructions
,
4076 struct _mesa_glsl_parse_state
*state
)
4079 stmts
->hir(instructions
, state
);
4081 /* Switch bodies do not have r-values. */
4086 ast_case_statement_list::hir(exec_list
*instructions
,
4087 struct _mesa_glsl_parse_state
*state
)
4089 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
)
4090 case_stmt
->hir(instructions
, state
);
4092 /* Case statements do not have r-values. */
4097 ast_case_statement::hir(exec_list
*instructions
,
4098 struct _mesa_glsl_parse_state
*state
)
4100 labels
->hir(instructions
, state
);
4102 /* Conditionally set fallthru state based on break state. */
4103 ir_constant
*const false_val
= new(state
) ir_constant(false);
4104 ir_dereference_variable
*const deref_is_fallthru_var
=
4105 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4106 ir_dereference_variable
*const deref_is_break_var
=
4107 new(state
) ir_dereference_variable(state
->switch_state
.is_break_var
);
4108 ir_assignment
*const reset_fallthru_on_break
=
4109 new(state
) ir_assignment(deref_is_fallthru_var
,
4111 deref_is_break_var
);
4112 instructions
->push_tail(reset_fallthru_on_break
);
4114 /* Guard case statements depending on fallthru state. */
4115 ir_dereference_variable
*const deref_fallthru_guard
=
4116 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4117 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
4119 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
4120 stmt
->hir(& test_fallthru
->then_instructions
, state
);
4122 instructions
->push_tail(test_fallthru
);
4124 /* Case statements do not have r-values. */
4130 ast_case_label_list::hir(exec_list
*instructions
,
4131 struct _mesa_glsl_parse_state
*state
)
4133 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
4134 label
->hir(instructions
, state
);
4136 /* Case labels do not have r-values. */
4141 ast_case_label::hir(exec_list
*instructions
,
4142 struct _mesa_glsl_parse_state
*state
)
4146 ir_dereference_variable
*deref_fallthru_var
=
4147 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4149 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
4151 /* If not default case, ... */
4152 if (this->test_value
!= NULL
) {
4153 /* Conditionally set fallthru state based on
4154 * comparison of cached test expression value to case label.
4156 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
4157 ir_constant
*label_const
= label_rval
->constant_expression_value();
4160 YYLTYPE loc
= this->test_value
->get_location();
4162 _mesa_glsl_error(& loc
, state
,
4163 "switch statement case label must be a "
4164 "constant expression");
4166 /* Stuff a dummy value in to allow processing to continue. */
4167 label_const
= new(ctx
) ir_constant(0);
4169 ast_expression
*previous_label
= (ast_expression
*)
4170 hash_table_find(state
->switch_state
.labels_ht
,
4171 (void *)(uintptr_t)label_const
->value
.u
[0]);
4173 if (previous_label
) {
4174 YYLTYPE loc
= this->test_value
->get_location();
4175 _mesa_glsl_error(& loc
, state
,
4176 "duplicate case value");
4178 loc
= previous_label
->get_location();
4179 _mesa_glsl_error(& loc
, state
,
4180 "this is the previous case label");
4182 hash_table_insert(state
->switch_state
.labels_ht
,
4184 (void *)(uintptr_t)label_const
->value
.u
[0]);
4188 ir_dereference_variable
*deref_test_var
=
4189 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4191 ir_rvalue
*const test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4195 ir_assignment
*set_fallthru_on_test
=
4196 new(ctx
) ir_assignment(deref_fallthru_var
,
4200 instructions
->push_tail(set_fallthru_on_test
);
4201 } else { /* default case */
4202 if (state
->switch_state
.previous_default
) {
4203 YYLTYPE loc
= this->get_location();
4204 _mesa_glsl_error(& loc
, state
,
4205 "multiple default labels in one switch");
4207 loc
= state
->switch_state
.previous_default
->get_location();
4208 _mesa_glsl_error(& loc
, state
,
4209 "this is the first default label");
4211 state
->switch_state
.previous_default
= this;
4213 /* Set falltrhu state. */
4214 ir_assignment
*set_fallthru
=
4215 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
);
4217 instructions
->push_tail(set_fallthru
);
4220 /* Case statements do not have r-values. */
4225 ast_iteration_statement::condition_to_hir(ir_loop
*stmt
,
4226 struct _mesa_glsl_parse_state
*state
)
4230 if (condition
!= NULL
) {
4231 ir_rvalue
*const cond
=
4232 condition
->hir(& stmt
->body_instructions
, state
);
4235 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
4236 YYLTYPE loc
= condition
->get_location();
4238 _mesa_glsl_error(& loc
, state
,
4239 "loop condition must be scalar boolean");
4241 /* As the first code in the loop body, generate a block that looks
4242 * like 'if (!condition) break;' as the loop termination condition.
4244 ir_rvalue
*const not_cond
=
4245 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
4247 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
4249 ir_jump
*const break_stmt
=
4250 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4252 if_stmt
->then_instructions
.push_tail(break_stmt
);
4253 stmt
->body_instructions
.push_tail(if_stmt
);
4260 ast_iteration_statement::hir(exec_list
*instructions
,
4261 struct _mesa_glsl_parse_state
*state
)
4265 /* For-loops and while-loops start a new scope, but do-while loops do not.
4267 if (mode
!= ast_do_while
)
4268 state
->symbols
->push_scope();
4270 if (init_statement
!= NULL
)
4271 init_statement
->hir(instructions
, state
);
4273 ir_loop
*const stmt
= new(ctx
) ir_loop();
4274 instructions
->push_tail(stmt
);
4276 /* Track the current loop nesting. */
4277 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
4279 state
->loop_nesting_ast
= this;
4281 /* Likewise, indicate that following code is closest to a loop,
4282 * NOT closest to a switch.
4284 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
4285 state
->switch_state
.is_switch_innermost
= false;
4287 if (mode
!= ast_do_while
)
4288 condition_to_hir(stmt
, state
);
4291 body
->hir(& stmt
->body_instructions
, state
);
4293 if (rest_expression
!= NULL
)
4294 rest_expression
->hir(& stmt
->body_instructions
, state
);
4296 if (mode
== ast_do_while
)
4297 condition_to_hir(stmt
, state
);
4299 if (mode
!= ast_do_while
)
4300 state
->symbols
->pop_scope();
4302 /* Restore previous nesting before returning. */
4303 state
->loop_nesting_ast
= nesting_ast
;
4304 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
4306 /* Loops do not have r-values.
4313 * Determine if the given type is valid for establishing a default precision
4316 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
4318 * "The precision statement
4320 * precision precision-qualifier type;
4322 * can be used to establish a default precision qualifier. The type field
4323 * can be either int or float or any of the sampler types, and the
4324 * precision-qualifier can be lowp, mediump, or highp."
4326 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
4327 * qualifiers on sampler types, but this seems like an oversight (since the
4328 * intention of including these in GLSL 1.30 is to allow compatibility with ES
4329 * shaders). So we allow int, float, and all sampler types regardless of GLSL
4333 is_valid_default_precision_type(const struct glsl_type
*const type
)
4338 switch (type
->base_type
) {
4340 case GLSL_TYPE_FLOAT
:
4341 /* "int" and "float" are valid, but vectors and matrices are not. */
4342 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
4343 case GLSL_TYPE_SAMPLER
:
4352 ast_type_specifier::hir(exec_list
*instructions
,
4353 struct _mesa_glsl_parse_state
*state
)
4355 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
4358 YYLTYPE loc
= this->get_location();
4360 /* If this is a precision statement, check that the type to which it is
4361 * applied is either float or int.
4363 * From section 4.5.3 of the GLSL 1.30 spec:
4364 * "The precision statement
4365 * precision precision-qualifier type;
4366 * can be used to establish a default precision qualifier. The type
4367 * field can be either int or float [...]. Any other types or
4368 * qualifiers will result in an error.
4370 if (this->default_precision
!= ast_precision_none
) {
4371 if (!state
->check_precision_qualifiers_allowed(&loc
))
4374 if (this->structure
!= NULL
) {
4375 _mesa_glsl_error(&loc
, state
,
4376 "precision qualifiers do not apply to structures");
4380 if (this->is_array
) {
4381 _mesa_glsl_error(&loc
, state
,
4382 "default precision statements do not apply to "
4387 const struct glsl_type
*const type
=
4388 state
->symbols
->get_type(this->type_name
);
4389 if (!is_valid_default_precision_type(type
)) {
4390 _mesa_glsl_error(&loc
, state
,
4391 "default precision statements apply only to "
4392 "float, int, and sampler types");
4396 if (type
->base_type
== GLSL_TYPE_FLOAT
4398 && state
->target
== fragment_shader
) {
4399 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
4402 * "The fragment language has no default precision qualifier for
4403 * floating point types."
4405 * As a result, we have to track whether or not default precision has
4406 * been specified for float in GLSL ES fragment shaders.
4408 * Earlier in that same section, the spec says:
4410 * "Non-precision qualified declarations will use the precision
4411 * qualifier specified in the most recent precision statement
4412 * that is still in scope. The precision statement has the same
4413 * scoping rules as variable declarations. If it is declared
4414 * inside a compound statement, its effect stops at the end of
4415 * the innermost statement it was declared in. Precision
4416 * statements in nested scopes override precision statements in
4417 * outer scopes. Multiple precision statements for the same basic
4418 * type can appear inside the same scope, with later statements
4419 * overriding earlier statements within that scope."
4421 * Default precision specifications follow the same scope rules as
4422 * variables. So, we can track the state of the default float
4423 * precision in the symbol table, and the rules will just work. This
4424 * is a slight abuse of the symbol table, but it has the semantics
4427 ir_variable
*const junk
=
4428 new(state
) ir_variable(type
, "#default precision",
4431 state
->symbols
->add_variable(junk
);
4434 /* FINISHME: Translate precision statements into IR. */
4438 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
4439 * process_record_constructor() can do type-checking on C-style initializer
4440 * expressions of structs, but ast_struct_specifier should only be translated
4441 * to HIR if it is declaring the type of a structure.
4443 * The ->is_declaration field is false for initializers of variables
4444 * declared separately from the struct's type definition.
4446 * struct S { ... }; (is_declaration = true)
4447 * struct T { ... } t = { ... }; (is_declaration = true)
4448 * S s = { ... }; (is_declaration = false)
4450 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
4451 return this->structure
->hir(instructions
, state
);
4458 * Process a structure or interface block tree into an array of structure fields
4460 * After parsing, where there are some syntax differnces, structures and
4461 * interface blocks are almost identical. They are similar enough that the
4462 * AST for each can be processed the same way into a set of
4463 * \c glsl_struct_field to describe the members.
4465 * If we're processing an interface block, var_mode should be the type of the
4466 * interface block (ir_var_shader_in, ir_var_shader_out, or ir_var_uniform).
4467 * If we're processing a structure, var_mode should be ir_var_auto.
4470 * The number of fields processed. A pointer to the array structure fields is
4471 * stored in \c *fields_ret.
4474 ast_process_structure_or_interface_block(exec_list
*instructions
,
4475 struct _mesa_glsl_parse_state
*state
,
4476 exec_list
*declarations
,
4478 glsl_struct_field
**fields_ret
,
4480 bool block_row_major
,
4481 bool allow_reserved_names
,
4482 ir_variable_mode var_mode
)
4484 unsigned decl_count
= 0;
4486 /* Make an initial pass over the list of fields to determine how
4487 * many there are. Each element in this list is an ast_declarator_list.
4488 * This means that we actually need to count the number of elements in the
4489 * 'declarations' list in each of the elements.
4491 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4492 foreach_list_const (decl_ptr
, & decl_list
->declarations
) {
4497 /* Allocate storage for the fields and process the field
4498 * declarations. As the declarations are processed, try to also convert
4499 * the types to HIR. This ensures that structure definitions embedded in
4500 * other structure definitions or in interface blocks are processed.
4502 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
4506 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
4507 const char *type_name
;
4509 decl_list
->type
->specifier
->hir(instructions
, state
);
4511 /* Section 10.9 of the GLSL ES 1.00 specification states that
4512 * embedded structure definitions have been removed from the language.
4514 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
4515 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
4516 "not allowed in GLSL ES 1.00");
4519 const glsl_type
*decl_type
=
4520 decl_list
->type
->glsl_type(& type_name
, state
);
4522 foreach_list_typed (ast_declaration
, decl
, link
,
4523 &decl_list
->declarations
) {
4524 if (!allow_reserved_names
)
4525 validate_identifier(decl
->identifier
, loc
, state
);
4527 /* From the GL_ARB_uniform_buffer_object spec:
4529 * "Sampler types are not allowed inside of uniform
4530 * blocks. All other types, arrays, and structures
4531 * allowed for uniforms are allowed within a uniform
4534 * It should be impossible for decl_type to be NULL here. Cases that
4535 * might naturally lead to decl_type being NULL, especially for the
4536 * is_interface case, will have resulted in compilation having
4537 * already halted due to a syntax error.
4539 const struct glsl_type
*field_type
=
4540 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
4542 if (is_interface
&& field_type
->contains_sampler()) {
4543 YYLTYPE loc
= decl_list
->get_location();
4544 _mesa_glsl_error(&loc
, state
,
4545 "uniform in non-default uniform block contains sampler");
4548 const struct ast_type_qualifier
*const qual
=
4549 & decl_list
->type
->qualifier
;
4550 if (qual
->flags
.q
.std140
||
4551 qual
->flags
.q
.packed
||
4552 qual
->flags
.q
.shared
) {
4553 _mesa_glsl_error(&loc
, state
,
4554 "uniform block layout qualifiers std140, packed, and "
4555 "shared can only be applied to uniform blocks, not "
4559 if (decl
->is_array
) {
4560 field_type
= process_array_type(&loc
, decl_type
, decl
->array_size
,
4563 fields
[i
].type
= field_type
;
4564 fields
[i
].name
= decl
->identifier
;
4565 fields
[i
].location
= -1;
4566 fields
[i
].interpolation
=
4567 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
4568 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
4570 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
4571 if (!qual
->flags
.q
.uniform
) {
4572 _mesa_glsl_error(&loc
, state
,
4573 "row_major and column_major can only be "
4574 "applied to uniform interface blocks");
4576 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
4579 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
4580 _mesa_glsl_error(&loc
, state
,
4581 "interpolation qualifiers cannot be used "
4582 "with uniform interface blocks");
4585 if (field_type
->is_matrix() ||
4586 (field_type
->is_array() && field_type
->fields
.array
->is_matrix())) {
4587 fields
[i
].row_major
= block_row_major
;
4588 if (qual
->flags
.q
.row_major
)
4589 fields
[i
].row_major
= true;
4590 else if (qual
->flags
.q
.column_major
)
4591 fields
[i
].row_major
= false;
4598 assert(i
== decl_count
);
4600 *fields_ret
= fields
;
4606 ast_struct_specifier::hir(exec_list
*instructions
,
4607 struct _mesa_glsl_parse_state
*state
)
4609 YYLTYPE loc
= this->get_location();
4611 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
4613 * "Anonymous structures are not supported; so embedded structures must
4614 * have a declarator. A name given to an embedded struct is scoped at
4615 * the same level as the struct it is embedded in."
4617 * The same section of the GLSL 1.20 spec says:
4619 * "Anonymous structures are not supported. Embedded structures are not
4622 * struct S { float f; };
4624 * S; // Error: anonymous structures disallowed
4625 * struct { ... }; // Error: embedded structures disallowed
4626 * S s; // Okay: nested structures with name are allowed
4629 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
4630 * we allow embedded structures in 1.10 only.
4632 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
4633 _mesa_glsl_error(&loc
, state
,
4634 "embedded structure declartions are not allowed");
4636 state
->struct_specifier_depth
++;
4638 glsl_struct_field
*fields
;
4639 unsigned decl_count
=
4640 ast_process_structure_or_interface_block(instructions
,
4642 &this->declarations
,
4647 false /* allow_reserved_names */,
4650 validate_identifier(this->name
, loc
, state
);
4652 const glsl_type
*t
=
4653 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
4655 if (!state
->symbols
->add_type(name
, t
)) {
4656 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
4658 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
4660 state
->num_user_structures
+ 1);
4662 s
[state
->num_user_structures
] = t
;
4663 state
->user_structures
= s
;
4664 state
->num_user_structures
++;
4668 state
->struct_specifier_depth
--;
4670 /* Structure type definitions do not have r-values.
4677 * Visitor class which detects whether a given interface block has been used.
4679 class interface_block_usage_visitor
: public ir_hierarchical_visitor
4682 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
4683 : mode(mode
), block(block
), found(false)
4687 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
4689 if (ir
->var
->mode
== mode
&& ir
->var
->get_interface_type() == block
) {
4693 return visit_continue
;
4696 bool usage_found() const
4702 ir_variable_mode mode
;
4703 const glsl_type
*block
;
4709 ast_interface_block::hir(exec_list
*instructions
,
4710 struct _mesa_glsl_parse_state
*state
)
4712 YYLTYPE loc
= this->get_location();
4714 /* The ast_interface_block has a list of ast_declarator_lists. We
4715 * need to turn those into ir_variables with an association
4716 * with this uniform block.
4718 enum glsl_interface_packing packing
;
4719 if (this->layout
.flags
.q
.shared
) {
4720 packing
= GLSL_INTERFACE_PACKING_SHARED
;
4721 } else if (this->layout
.flags
.q
.packed
) {
4722 packing
= GLSL_INTERFACE_PACKING_PACKED
;
4724 /* The default layout is std140.
4726 packing
= GLSL_INTERFACE_PACKING_STD140
;
4729 ir_variable_mode var_mode
;
4730 const char *iface_type_name
;
4731 if (this->layout
.flags
.q
.in
) {
4732 var_mode
= ir_var_shader_in
;
4733 iface_type_name
= "in";
4734 } else if (this->layout
.flags
.q
.out
) {
4735 var_mode
= ir_var_shader_out
;
4736 iface_type_name
= "out";
4737 } else if (this->layout
.flags
.q
.uniform
) {
4738 var_mode
= ir_var_uniform
;
4739 iface_type_name
= "uniform";
4741 var_mode
= ir_var_auto
;
4742 iface_type_name
= "UNKNOWN";
4743 assert(!"interface block layout qualifier not found!");
4746 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
4747 bool block_row_major
= this->layout
.flags
.q
.row_major
;
4748 exec_list declared_variables
;
4749 glsl_struct_field
*fields
;
4750 unsigned int num_variables
=
4751 ast_process_structure_or_interface_block(&declared_variables
,
4753 &this->declarations
,
4758 redeclaring_per_vertex
,
4761 if (!redeclaring_per_vertex
)
4762 validate_identifier(this->block_name
, loc
, state
);
4764 const glsl_type
*earlier_per_vertex
= NULL
;
4765 if (redeclaring_per_vertex
) {
4766 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
4767 * the named interface block gl_in, we can find it by looking at the
4768 * previous declaration of gl_in. Otherwise we can find it by looking
4769 * at the previous decalartion of any of the built-in outputs,
4772 * Also check that the instance name and array-ness of the redeclaration
4776 case ir_var_shader_in
:
4777 if (ir_variable
*earlier_gl_in
=
4778 state
->symbols
->get_variable("gl_in")) {
4779 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
4781 _mesa_glsl_error(&loc
, state
,
4782 "redeclaration of gl_PerVertex input not allowed "
4784 _mesa_glsl_shader_target_name(state
->target
));
4786 if (this->instance_name
== NULL
||
4787 strcmp(this->instance_name
, "gl_in") != 0 || !this->is_array
) {
4788 _mesa_glsl_error(&loc
, state
,
4789 "gl_PerVertex input must be redeclared as "
4793 case ir_var_shader_out
:
4794 if (ir_variable
*earlier_gl_Position
=
4795 state
->symbols
->get_variable("gl_Position")) {
4796 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
4798 _mesa_glsl_error(&loc
, state
,
4799 "redeclaration of gl_PerVertex output not "
4800 "allowed in the %s shader",
4801 _mesa_glsl_shader_target_name(state
->target
));
4803 if (this->instance_name
!= NULL
) {
4804 _mesa_glsl_error(&loc
, state
,
4805 "gl_PerVertex input may not be redeclared with "
4806 "an instance name");
4810 _mesa_glsl_error(&loc
, state
,
4811 "gl_PerVertex must be declared as an input or an "
4816 if (earlier_per_vertex
== NULL
) {
4817 /* An error has already been reported. Bail out to avoid null
4818 * dereferences later in this function.
4823 /* Copy locations from the old gl_PerVertex interface block. */
4824 for (unsigned i
= 0; i
< num_variables
; i
++) {
4825 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
4827 _mesa_glsl_error(&loc
, state
,
4828 "redeclaration of gl_PerVertex must be a subset "
4829 "of the built-in members of gl_PerVertex");
4831 fields
[i
].location
=
4832 earlier_per_vertex
->fields
.structure
[j
].location
;
4833 fields
[i
].interpolation
=
4834 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
4835 fields
[i
].centroid
=
4836 earlier_per_vertex
->fields
.structure
[j
].centroid
;
4840 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
4843 * If a built-in interface block is redeclared, it must appear in
4844 * the shader before any use of any member included in the built-in
4845 * declaration, or a compilation error will result.
4847 * This appears to be a clarification to the behaviour established for
4848 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
4849 * regardless of GLSL version.
4851 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
4852 v
.run(instructions
);
4853 if (v
.usage_found()) {
4854 _mesa_glsl_error(&loc
, state
,
4855 "redeclaration of a built-in interface block must "
4856 "appear before any use of any member of the "
4861 const glsl_type
*block_type
=
4862 glsl_type::get_interface_instance(fields
,
4867 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
4868 YYLTYPE loc
= this->get_location();
4869 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
4870 "already taken in the current scope",
4871 this->block_name
, iface_type_name
);
4874 /* Since interface blocks cannot contain statements, it should be
4875 * impossible for the block to generate any instructions.
4877 assert(declared_variables
.is_empty());
4879 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4881 * Geometry shader input variables get the per-vertex values written
4882 * out by vertex shader output variables of the same names. Since a
4883 * geometry shader operates on a set of vertices, each input varying
4884 * variable (or input block, see interface blocks below) needs to be
4885 * declared as an array.
4887 if (state
->target
== geometry_shader
&& !this->is_array
&&
4888 var_mode
== ir_var_shader_in
) {
4889 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
4892 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
4895 * "If an instance name (instance-name) is used, then it puts all the
4896 * members inside a scope within its own name space, accessed with the
4897 * field selector ( . ) operator (analogously to structures)."
4899 if (this->instance_name
) {
4900 if (redeclaring_per_vertex
) {
4901 /* When a built-in in an unnamed interface block is redeclared,
4902 * get_variable_being_redeclared() calls
4903 * check_builtin_array_max_size() to make sure that built-in array
4904 * variables aren't redeclared to illegal sizes. But we're looking
4905 * at a redeclaration of a named built-in interface block. So we
4906 * have to manually call check_builtin_array_max_size() for all parts
4907 * of the interface that are arrays.
4909 for (unsigned i
= 0; i
< num_variables
; i
++) {
4910 if (fields
[i
].type
->is_array()) {
4911 const unsigned size
= fields
[i
].type
->array_size();
4912 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
4916 validate_identifier(this->instance_name
, loc
, state
);
4921 if (this->is_array
) {
4922 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
4924 * For uniform blocks declared an array, each individual array
4925 * element corresponds to a separate buffer object backing one
4926 * instance of the block. As the array size indicates the number
4927 * of buffer objects needed, uniform block array declarations
4928 * must specify an array size.
4930 * And a few paragraphs later:
4932 * Geometry shader input blocks must be declared as arrays and
4933 * follow the array declaration and linking rules for all
4934 * geometry shader inputs. All other input and output block
4935 * arrays must specify an array size.
4937 * The upshot of this is that the only circumstance where an
4938 * interface array size *doesn't* need to be specified is on a
4939 * geometry shader input.
4941 if (this->array_size
== NULL
&&
4942 (state
->target
!= geometry_shader
|| !this->layout
.flags
.q
.in
)) {
4943 _mesa_glsl_error(&loc
, state
,
4944 "only geometry shader inputs may be unsized "
4945 "instance block arrays");
4949 const glsl_type
*block_array_type
=
4950 process_array_type(&loc
, block_type
, this->array_size
, state
);
4952 var
= new(state
) ir_variable(block_array_type
,
4953 this->instance_name
,
4956 var
= new(state
) ir_variable(block_type
,
4957 this->instance_name
,
4961 if (state
->target
== geometry_shader
&& var_mode
== ir_var_shader_in
)
4962 handle_geometry_shader_input_decl(state
, loc
, var
);
4964 if (ir_variable
*earlier
=
4965 state
->symbols
->get_variable(this->instance_name
)) {
4966 if (!redeclaring_per_vertex
) {
4967 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
4968 this->instance_name
);
4970 earlier
->type
= var
->type
;
4971 earlier
->reinit_interface_type(block_type
);
4974 state
->symbols
->add_variable(var
);
4975 instructions
->push_tail(var
);
4978 /* In order to have an array size, the block must also be declared with
4981 assert(!this->is_array
);
4983 for (unsigned i
= 0; i
< num_variables
; i
++) {
4985 new(state
) ir_variable(fields
[i
].type
,
4986 ralloc_strdup(state
, fields
[i
].name
),
4988 var
->interpolation
= fields
[i
].interpolation
;
4989 var
->centroid
= fields
[i
].centroid
;
4990 var
->init_interface_type(block_type
);
4992 if (redeclaring_per_vertex
) {
4993 ir_variable
*earlier
=
4994 get_variable_being_redeclared(var
, loc
, state
,
4995 true /* allow_all_redeclarations */);
4996 if (strncmp(var
->name
, "gl_", 3) != 0 || earlier
== NULL
) {
4997 _mesa_glsl_error(&loc
, state
,
4998 "redeclaration of gl_PerVertex can only "
4999 "include built-in variables");
5001 earlier
->reinit_interface_type(block_type
);
5006 if (state
->symbols
->get_variable(var
->name
) != NULL
)
5007 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
5009 /* Propagate the "binding" keyword into this UBO's fields;
5010 * the UBO declaration itself doesn't get an ir_variable unless it
5011 * has an instance name. This is ugly.
5013 var
->explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
5014 var
->binding
= this->layout
.binding
;
5016 state
->symbols
->add_variable(var
);
5017 instructions
->push_tail(var
);
5020 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
5021 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
5023 * It is also a compilation error ... to redeclare a built-in
5024 * block and then use a member from that built-in block that was
5025 * not included in the redeclaration.
5027 * This appears to be a clarification to the behaviour established
5028 * for gl_PerVertex by GLSL 1.50, therefore we implement this
5029 * behaviour regardless of GLSL version.
5031 * To prevent the shader from using a member that was not included in
5032 * the redeclaration, we disable any ir_variables that are still
5033 * associated with the old declaration of gl_PerVertex (since we've
5034 * already updated all of the variables contained in the new
5035 * gl_PerVertex to point to it).
5037 * As a side effect this will prevent
5038 * validate_intrastage_interface_blocks() from getting confused and
5039 * thinking there are conflicting definitions of gl_PerVertex in the
5042 foreach_list_safe(node
, instructions
) {
5043 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5045 var
->get_interface_type() == earlier_per_vertex
&&
5046 var
->mode
== var_mode
) {
5047 state
->symbols
->disable_variable(var
->name
);
5059 ast_gs_input_layout::hir(exec_list
*instructions
,
5060 struct _mesa_glsl_parse_state
*state
)
5062 YYLTYPE loc
= this->get_location();
5064 /* If any geometry input layout declaration preceded this one, make sure it
5065 * was consistent with this one.
5067 if (state
->gs_input_prim_type_specified
&&
5068 state
->gs_input_prim_type
!= this->prim_type
) {
5069 _mesa_glsl_error(&loc
, state
,
5070 "geometry shader input layout does not match"
5071 " previous declaration");
5075 /* If any shader inputs occurred before this declaration and specified an
5076 * array size, make sure the size they specified is consistent with the
5079 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
5080 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
5081 _mesa_glsl_error(&loc
, state
,
5082 "this geometry shader input layout implies %u vertices"
5083 " per primitive, but a previous input is declared"
5084 " with size %u", num_vertices
, state
->gs_input_size
);
5088 state
->gs_input_prim_type_specified
= true;
5089 state
->gs_input_prim_type
= this->prim_type
;
5091 /* If any shader inputs occurred before this declaration and did not
5092 * specify an array size, their size is determined now.
5094 foreach_list (node
, instructions
) {
5095 ir_variable
*var
= ((ir_instruction
*) node
)->as_variable();
5096 if (var
== NULL
|| var
->mode
!= ir_var_shader_in
)
5099 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
5102 if (!var
->type
->is_array())
5105 if (var
->type
->length
== 0) {
5106 if (var
->max_array_access
>= num_vertices
) {
5107 _mesa_glsl_error(&loc
, state
,
5108 "this geometry shader input layout implies %u"
5109 " vertices, but an access to element %u of input"
5110 " `%s' already exists", num_vertices
,
5111 var
->max_array_access
, var
->name
);
5113 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
5124 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
5125 exec_list
*instructions
)
5127 bool gl_FragColor_assigned
= false;
5128 bool gl_FragData_assigned
= false;
5129 bool user_defined_fs_output_assigned
= false;
5130 ir_variable
*user_defined_fs_output
= NULL
;
5132 /* It would be nice to have proper location information. */
5134 memset(&loc
, 0, sizeof(loc
));
5136 foreach_list(node
, instructions
) {
5137 ir_variable
*var
= ((ir_instruction
*)node
)->as_variable();
5139 if (!var
|| !var
->assigned
)
5142 if (strcmp(var
->name
, "gl_FragColor") == 0)
5143 gl_FragColor_assigned
= true;
5144 else if (strcmp(var
->name
, "gl_FragData") == 0)
5145 gl_FragData_assigned
= true;
5146 else if (strncmp(var
->name
, "gl_", 3) != 0) {
5147 if (state
->target
== fragment_shader
&&
5148 var
->mode
== ir_var_shader_out
) {
5149 user_defined_fs_output_assigned
= true;
5150 user_defined_fs_output
= var
;
5155 /* From the GLSL 1.30 spec:
5157 * "If a shader statically assigns a value to gl_FragColor, it
5158 * may not assign a value to any element of gl_FragData. If a
5159 * shader statically writes a value to any element of
5160 * gl_FragData, it may not assign a value to
5161 * gl_FragColor. That is, a shader may assign values to either
5162 * gl_FragColor or gl_FragData, but not both. Multiple shaders
5163 * linked together must also consistently write just one of
5164 * these variables. Similarly, if user declared output
5165 * variables are in use (statically assigned to), then the
5166 * built-in variables gl_FragColor and gl_FragData may not be
5167 * assigned to. These incorrect usages all generate compile
5170 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
5171 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5172 "`gl_FragColor' and `gl_FragData'");
5173 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
5174 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5175 "`gl_FragColor' and `%s'",
5176 user_defined_fs_output
->name
);
5177 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
5178 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
5179 "`gl_FragData' and `%s'",
5180 user_defined_fs_output
->name
);
5186 remove_per_vertex_blocks(exec_list
*instructions
,
5187 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
5189 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
5190 * if it exists in this shader type.
5192 const glsl_type
*per_vertex
= NULL
;
5194 case ir_var_shader_in
:
5195 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
5196 per_vertex
= gl_in
->get_interface_type();
5198 case ir_var_shader_out
:
5199 if (ir_variable
*gl_Position
=
5200 state
->symbols
->get_variable("gl_Position")) {
5201 per_vertex
= gl_Position
->get_interface_type();
5205 assert(!"Unexpected mode");
5209 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
5210 * need to do anything.
5212 if (per_vertex
== NULL
)
5215 /* If the interface block is used by the shader, then we don't need to do
5218 interface_block_usage_visitor
v(mode
, per_vertex
);
5219 v
.run(instructions
);
5220 if (v
.usage_found())
5223 /* Remove any ir_variable declarations that refer to the interface block
5226 foreach_list_safe(node
, instructions
) {
5227 ir_variable
*const var
= ((ir_instruction
*) node
)->as_variable();
5228 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
5229 var
->mode
== mode
) {
5230 state
->symbols
->disable_variable(var
->name
);