2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "glsl_symbol_table.h"
53 #include "glsl_parser_extras.h"
55 #include "glsl_types.h"
56 #include "program/hash_table.h"
58 #include "ir_builder.h"
60 using namespace ir_builder
;
63 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
64 exec_list
*instructions
);
66 remove_per_vertex_blocks(exec_list
*instructions
,
67 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
71 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
73 _mesa_glsl_initialize_variables(instructions
, state
);
75 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
77 state
->current_function
= NULL
;
79 state
->toplevel_ir
= instructions
;
81 state
->gs_input_prim_type_specified
= false;
82 state
->cs_input_local_size_specified
= false;
84 /* Section 4.2 of the GLSL 1.20 specification states:
85 * "The built-in functions are scoped in a scope outside the global scope
86 * users declare global variables in. That is, a shader's global scope,
87 * available for user-defined functions and global variables, is nested
88 * inside the scope containing the built-in functions."
90 * Since built-in functions like ftransform() access built-in variables,
91 * it follows that those must be in the outer scope as well.
93 * We push scope here to create this nesting effect...but don't pop.
94 * This way, a shader's globals are still in the symbol table for use
97 state
->symbols
->push_scope();
99 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
100 ast
->hir(instructions
, state
);
102 detect_recursion_unlinked(state
, instructions
);
103 detect_conflicting_assignments(state
, instructions
);
105 state
->toplevel_ir
= NULL
;
107 /* Move all of the variable declarations to the front of the IR list, and
108 * reverse the order. This has the (intended!) side effect that vertex
109 * shader inputs and fragment shader outputs will appear in the IR in the
110 * same order that they appeared in the shader code. This results in the
111 * locations being assigned in the declared order. Many (arguably buggy)
112 * applications depend on this behavior, and it matches what nearly all
115 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
116 ir_variable
*const var
= node
->as_variable();
122 instructions
->push_head(var
);
125 /* Figure out if gl_FragCoord is actually used in fragment shader */
126 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
128 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
130 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
132 * If multiple shaders using members of a built-in block belonging to
133 * the same interface are linked together in the same program, they
134 * must all redeclare the built-in block in the same way, as described
135 * in section 4.3.7 "Interface Blocks" for interface block matching, or
136 * a link error will result.
138 * The phrase "using members of a built-in block" implies that if two
139 * shaders are linked together and one of them *does not use* any members
140 * of the built-in block, then that shader does not need to have a matching
141 * redeclaration of the built-in block.
143 * This appears to be a clarification to the behaviour established for
144 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
147 * The definition of "interface" in section 4.3.7 that applies here is as
150 * The boundary between adjacent programmable pipeline stages: This
151 * spans all the outputs in all compilation units of the first stage
152 * and all the inputs in all compilation units of the second stage.
154 * Therefore this rule applies to both inter- and intra-stage linking.
156 * The easiest way to implement this is to check whether the shader uses
157 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
158 * remove all the relevant variable declaration from the IR, so that the
159 * linker won't see them and complain about mismatches.
161 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
162 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
166 static ir_expression_operation
167 get_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
168 struct _mesa_glsl_parse_state
*state
)
170 switch (to
->base_type
) {
171 case GLSL_TYPE_FLOAT
:
172 switch (from
->base_type
) {
173 case GLSL_TYPE_INT
: return ir_unop_i2f
;
174 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
175 case GLSL_TYPE_DOUBLE
: return ir_unop_d2f
;
176 default: return (ir_expression_operation
)0;
180 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
)
181 return (ir_expression_operation
)0;
182 switch (from
->base_type
) {
183 case GLSL_TYPE_INT
: return ir_unop_i2u
;
184 default: return (ir_expression_operation
)0;
187 case GLSL_TYPE_DOUBLE
:
188 if (!state
->has_double())
189 return (ir_expression_operation
)0;
190 switch (from
->base_type
) {
191 case GLSL_TYPE_INT
: return ir_unop_i2d
;
192 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
193 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
194 default: return (ir_expression_operation
)0;
197 default: return (ir_expression_operation
)0;
203 * If a conversion is available, convert one operand to a different type
205 * The \c from \c ir_rvalue is converted "in place".
207 * \param to Type that the operand it to be converted to
208 * \param from Operand that is being converted
209 * \param state GLSL compiler state
212 * If a conversion is possible (or unnecessary), \c true is returned.
213 * Otherwise \c false is returned.
216 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
217 struct _mesa_glsl_parse_state
*state
)
220 if (to
->base_type
== from
->type
->base_type
)
223 /* Prior to GLSL 1.20, there are no implicit conversions */
224 if (!state
->is_version(120, 0))
227 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
229 * "There are no implicit array or structure conversions. For
230 * example, an array of int cannot be implicitly converted to an
233 if (!to
->is_numeric() || !from
->type
->is_numeric())
236 /* We don't actually want the specific type `to`, we want a type
237 * with the same base type as `to`, but the same vector width as
240 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
241 from
->type
->matrix_columns
);
243 ir_expression_operation op
= get_conversion_operation(to
, from
->type
, state
);
245 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
253 static const struct glsl_type
*
254 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
256 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
258 const glsl_type
*type_a
= value_a
->type
;
259 const glsl_type
*type_b
= value_b
->type
;
261 /* From GLSL 1.50 spec, page 56:
263 * "The arithmetic binary operators add (+), subtract (-),
264 * multiply (*), and divide (/) operate on integer and
265 * floating-point scalars, vectors, and matrices."
267 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
268 _mesa_glsl_error(loc
, state
,
269 "operands to arithmetic operators must be numeric");
270 return glsl_type::error_type
;
274 /* "If one operand is floating-point based and the other is
275 * not, then the conversions from Section 4.1.10 "Implicit
276 * Conversions" are applied to the non-floating-point-based operand."
278 if (!apply_implicit_conversion(type_a
, value_b
, state
)
279 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
280 _mesa_glsl_error(loc
, state
,
281 "could not implicitly convert operands to "
282 "arithmetic operator");
283 return glsl_type::error_type
;
285 type_a
= value_a
->type
;
286 type_b
= value_b
->type
;
288 /* "If the operands are integer types, they must both be signed or
291 * From this rule and the preceeding conversion it can be inferred that
292 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
293 * The is_numeric check above already filtered out the case where either
294 * type is not one of these, so now the base types need only be tested for
297 if (type_a
->base_type
!= type_b
->base_type
) {
298 _mesa_glsl_error(loc
, state
,
299 "base type mismatch for arithmetic operator");
300 return glsl_type::error_type
;
303 /* "All arithmetic binary operators result in the same fundamental type
304 * (signed integer, unsigned integer, or floating-point) as the
305 * operands they operate on, after operand type conversion. After
306 * conversion, the following cases are valid
308 * * The two operands are scalars. In this case the operation is
309 * applied, resulting in a scalar."
311 if (type_a
->is_scalar() && type_b
->is_scalar())
314 /* "* One operand is a scalar, and the other is a vector or matrix.
315 * In this case, the scalar operation is applied independently to each
316 * component of the vector or matrix, resulting in the same size
319 if (type_a
->is_scalar()) {
320 if (!type_b
->is_scalar())
322 } else if (type_b
->is_scalar()) {
326 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
327 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
330 assert(!type_a
->is_scalar());
331 assert(!type_b
->is_scalar());
333 /* "* The two operands are vectors of the same size. In this case, the
334 * operation is done component-wise resulting in the same size
337 if (type_a
->is_vector() && type_b
->is_vector()) {
338 if (type_a
== type_b
) {
341 _mesa_glsl_error(loc
, state
,
342 "vector size mismatch for arithmetic operator");
343 return glsl_type::error_type
;
347 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
348 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
349 * <vector, vector> have been handled. At least one of the operands must
350 * be matrix. Further, since there are no integer matrix types, the base
351 * type of both operands must be float.
353 assert(type_a
->is_matrix() || type_b
->is_matrix());
354 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
||
355 type_a
->base_type
== GLSL_TYPE_DOUBLE
);
356 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
||
357 type_b
->base_type
== GLSL_TYPE_DOUBLE
);
359 /* "* The operator is add (+), subtract (-), or divide (/), and the
360 * operands are matrices with the same number of rows and the same
361 * number of columns. In this case, the operation is done component-
362 * wise resulting in the same size matrix."
363 * * The operator is multiply (*), where both operands are matrices or
364 * one operand is a vector and the other a matrix. A right vector
365 * operand is treated as a column vector and a left vector operand as a
366 * row vector. In all these cases, it is required that the number of
367 * columns of the left operand is equal to the number of rows of the
368 * right operand. Then, the multiply (*) operation does a linear
369 * algebraic multiply, yielding an object that has the same number of
370 * rows as the left operand and the same number of columns as the right
371 * operand. Section 5.10 "Vector and Matrix Operations" explains in
372 * more detail how vectors and matrices are operated on."
375 if (type_a
== type_b
)
378 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
380 if (type
== glsl_type::error_type
) {
381 _mesa_glsl_error(loc
, state
,
382 "size mismatch for matrix multiplication");
389 /* "All other cases are illegal."
391 _mesa_glsl_error(loc
, state
, "type mismatch");
392 return glsl_type::error_type
;
396 static const struct glsl_type
*
397 unary_arithmetic_result_type(const struct glsl_type
*type
,
398 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
400 /* From GLSL 1.50 spec, page 57:
402 * "The arithmetic unary operators negate (-), post- and pre-increment
403 * and decrement (-- and ++) operate on integer or floating-point
404 * values (including vectors and matrices). All unary operators work
405 * component-wise on their operands. These result with the same type
408 if (!type
->is_numeric()) {
409 _mesa_glsl_error(loc
, state
,
410 "operands to arithmetic operators must be numeric");
411 return glsl_type::error_type
;
418 * \brief Return the result type of a bit-logic operation.
420 * If the given types to the bit-logic operator are invalid, return
421 * glsl_type::error_type.
423 * \param type_a Type of LHS of bit-logic op
424 * \param type_b Type of RHS of bit-logic op
426 static const struct glsl_type
*
427 bit_logic_result_type(const struct glsl_type
*type_a
,
428 const struct glsl_type
*type_b
,
430 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
432 if (!state
->check_bitwise_operations_allowed(loc
)) {
433 return glsl_type::error_type
;
436 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
438 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
439 * (|). The operands must be of type signed or unsigned integers or
442 if (!type_a
->is_integer()) {
443 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
444 ast_expression::operator_string(op
));
445 return glsl_type::error_type
;
447 if (!type_b
->is_integer()) {
448 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
449 ast_expression::operator_string(op
));
450 return glsl_type::error_type
;
453 /* "The fundamental types of the operands (signed or unsigned) must
456 if (type_a
->base_type
!= type_b
->base_type
) {
457 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
458 "base type", ast_expression::operator_string(op
));
459 return glsl_type::error_type
;
462 /* "The operands cannot be vectors of differing size." */
463 if (type_a
->is_vector() &&
464 type_b
->is_vector() &&
465 type_a
->vector_elements
!= type_b
->vector_elements
) {
466 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
467 "different sizes", ast_expression::operator_string(op
));
468 return glsl_type::error_type
;
471 /* "If one operand is a scalar and the other a vector, the scalar is
472 * applied component-wise to the vector, resulting in the same type as
473 * the vector. The fundamental types of the operands [...] will be the
474 * resulting fundamental type."
476 if (type_a
->is_scalar())
482 static const struct glsl_type
*
483 modulus_result_type(const struct glsl_type
*type_a
,
484 const struct glsl_type
*type_b
,
485 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
487 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
488 return glsl_type::error_type
;
491 /* From GLSL 1.50 spec, page 56:
492 * "The operator modulus (%) operates on signed or unsigned integers or
493 * integer vectors. The operand types must both be signed or both be
496 if (!type_a
->is_integer()) {
497 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
498 return glsl_type::error_type
;
500 if (!type_b
->is_integer()) {
501 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
502 return glsl_type::error_type
;
504 if (type_a
->base_type
!= type_b
->base_type
) {
505 _mesa_glsl_error(loc
, state
,
506 "operands of %% must have the same base type");
507 return glsl_type::error_type
;
510 /* "The operands cannot be vectors of differing size. If one operand is
511 * a scalar and the other vector, then the scalar is applied component-
512 * wise to the vector, resulting in the same type as the vector. If both
513 * are vectors of the same size, the result is computed component-wise."
515 if (type_a
->is_vector()) {
516 if (!type_b
->is_vector()
517 || (type_a
->vector_elements
== type_b
->vector_elements
))
522 /* "The operator modulus (%) is not defined for any other data types
523 * (non-integer types)."
525 _mesa_glsl_error(loc
, state
, "type mismatch");
526 return glsl_type::error_type
;
530 static const struct glsl_type
*
531 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
532 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
534 const glsl_type
*type_a
= value_a
->type
;
535 const glsl_type
*type_b
= value_b
->type
;
537 /* From GLSL 1.50 spec, page 56:
538 * "The relational operators greater than (>), less than (<), greater
539 * than or equal (>=), and less than or equal (<=) operate only on
540 * scalar integer and scalar floating-point expressions."
542 if (!type_a
->is_numeric()
543 || !type_b
->is_numeric()
544 || !type_a
->is_scalar()
545 || !type_b
->is_scalar()) {
546 _mesa_glsl_error(loc
, state
,
547 "operands to relational operators must be scalar and "
549 return glsl_type::error_type
;
552 /* "Either the operands' types must match, or the conversions from
553 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
554 * operand, after which the types must match."
556 if (!apply_implicit_conversion(type_a
, value_b
, state
)
557 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
558 _mesa_glsl_error(loc
, state
,
559 "could not implicitly convert operands to "
560 "relational operator");
561 return glsl_type::error_type
;
563 type_a
= value_a
->type
;
564 type_b
= value_b
->type
;
566 if (type_a
->base_type
!= type_b
->base_type
) {
567 _mesa_glsl_error(loc
, state
, "base type mismatch");
568 return glsl_type::error_type
;
571 /* "The result is scalar Boolean."
573 return glsl_type::bool_type
;
577 * \brief Return the result type of a bit-shift operation.
579 * If the given types to the bit-shift operator are invalid, return
580 * glsl_type::error_type.
582 * \param type_a Type of LHS of bit-shift op
583 * \param type_b Type of RHS of bit-shift op
585 static const struct glsl_type
*
586 shift_result_type(const struct glsl_type
*type_a
,
587 const struct glsl_type
*type_b
,
589 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
591 if (!state
->check_bitwise_operations_allowed(loc
)) {
592 return glsl_type::error_type
;
595 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
597 * "The shift operators (<<) and (>>). For both operators, the operands
598 * must be signed or unsigned integers or integer vectors. One operand
599 * can be signed while the other is unsigned."
601 if (!type_a
->is_integer()) {
602 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
603 "integer vector", ast_expression::operator_string(op
));
604 return glsl_type::error_type
;
607 if (!type_b
->is_integer()) {
608 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
609 "integer vector", ast_expression::operator_string(op
));
610 return glsl_type::error_type
;
613 /* "If the first operand is a scalar, the second operand has to be
616 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
617 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
618 "second must be scalar as well",
619 ast_expression::operator_string(op
));
620 return glsl_type::error_type
;
623 /* If both operands are vectors, check that they have same number of
626 if (type_a
->is_vector() &&
627 type_b
->is_vector() &&
628 type_a
->vector_elements
!= type_b
->vector_elements
) {
629 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
630 "have same number of elements",
631 ast_expression::operator_string(op
));
632 return glsl_type::error_type
;
635 /* "In all cases, the resulting type will be the same type as the left
642 * Validates that a value can be assigned to a location with a specified type
644 * Validates that \c rhs can be assigned to some location. If the types are
645 * not an exact match but an automatic conversion is possible, \c rhs will be
649 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
650 * Otherwise the actual RHS to be assigned will be returned. This may be
651 * \c rhs, or it may be \c rhs after some type conversion.
654 * In addition to being used for assignments, this function is used to
655 * type-check return values.
658 validate_assignment(struct _mesa_glsl_parse_state
*state
,
659 YYLTYPE loc
, const glsl_type
*lhs_type
,
660 ir_rvalue
*rhs
, bool is_initializer
)
662 /* If there is already some error in the RHS, just return it. Anything
663 * else will lead to an avalanche of error message back to the user.
665 if (rhs
->type
->is_error())
668 /* If the types are identical, the assignment can trivially proceed.
670 if (rhs
->type
== lhs_type
)
673 /* If the array element types are the same and the LHS is unsized,
674 * the assignment is okay for initializers embedded in variable
677 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
678 * is handled by ir_dereference::is_lvalue.
680 if (lhs_type
->is_unsized_array() && rhs
->type
->is_array()
681 && (lhs_type
->fields
.array
== rhs
->type
->fields
.array
)) {
682 if (is_initializer
) {
685 _mesa_glsl_error(&loc
, state
,
686 "implicitly sized arrays cannot be assigned");
691 /* Check for implicit conversion in GLSL 1.20 */
692 if (apply_implicit_conversion(lhs_type
, rhs
, state
)) {
693 if (rhs
->type
== lhs_type
)
697 _mesa_glsl_error(&loc
, state
,
698 "%s of type %s cannot be assigned to "
699 "variable of type %s",
700 is_initializer
? "initializer" : "value",
701 rhs
->type
->name
, lhs_type
->name
);
707 mark_whole_array_access(ir_rvalue
*access
)
709 ir_dereference_variable
*deref
= access
->as_dereference_variable();
711 if (deref
&& deref
->var
) {
712 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
717 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
718 const char *non_lvalue_description
,
719 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
720 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
725 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
726 ir_rvalue
*extract_channel
= NULL
;
728 /* If the assignment LHS comes back as an ir_binop_vector_extract
729 * expression, move it to the RHS as an ir_triop_vector_insert.
731 if (lhs
->ir_type
== ir_type_expression
) {
732 ir_expression
*const lhs_expr
= lhs
->as_expression();
734 if (unlikely(lhs_expr
->operation
== ir_binop_vector_extract
)) {
736 validate_assignment(state
, lhs_loc
, lhs
->type
,
737 rhs
, is_initializer
);
739 if (new_rhs
== NULL
) {
743 * - LHS: (expression float vector_extract <vec> <channel>)
747 * - RHS: (expression vec2 vector_insert <vec> <channel> <scalar>)
749 * The LHS type is now a vector instead of a scalar. Since GLSL
750 * allows assignments to be used as rvalues, we need to re-extract
751 * the channel from assignment_temp when returning the rvalue.
753 extract_channel
= lhs_expr
->operands
[1];
754 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
755 lhs_expr
->operands
[0]->type
,
756 lhs_expr
->operands
[0],
759 lhs
= lhs_expr
->operands
[0]->clone(ctx
, NULL
);
764 ir_variable
*lhs_var
= lhs
->variable_referenced();
766 lhs_var
->data
.assigned
= true;
768 if (!error_emitted
) {
769 if (non_lvalue_description
!= NULL
) {
770 _mesa_glsl_error(&lhs_loc
, state
,
772 non_lvalue_description
);
773 error_emitted
= true;
774 } else if (lhs_var
!= NULL
&& lhs_var
->data
.read_only
) {
775 _mesa_glsl_error(&lhs_loc
, state
,
776 "assignment to read-only variable '%s'",
778 error_emitted
= true;
779 } else if (lhs
->type
->is_array() &&
780 !state
->check_version(120, 300, &lhs_loc
,
781 "whole array assignment forbidden")) {
782 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
784 * "Other binary or unary expressions, non-dereferenced
785 * arrays, function names, swizzles with repeated fields,
786 * and constants cannot be l-values."
788 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
790 error_emitted
= true;
791 } else if (!lhs
->is_lvalue()) {
792 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
793 error_emitted
= true;
798 validate_assignment(state
, lhs_loc
, lhs
->type
, rhs
, is_initializer
);
799 if (new_rhs
!= NULL
) {
802 /* If the LHS array was not declared with a size, it takes it size from
803 * the RHS. If the LHS is an l-value and a whole array, it must be a
804 * dereference of a variable. Any other case would require that the LHS
805 * is either not an l-value or not a whole array.
807 if (lhs
->type
->is_unsized_array()) {
808 ir_dereference
*const d
= lhs
->as_dereference();
812 ir_variable
*const var
= d
->variable_referenced();
816 if (var
->data
.max_array_access
>= unsigned(rhs
->type
->array_size())) {
817 /* FINISHME: This should actually log the location of the RHS. */
818 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
820 var
->data
.max_array_access
);
823 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
824 rhs
->type
->array_size());
827 if (lhs
->type
->is_array()) {
828 mark_whole_array_access(rhs
);
829 mark_whole_array_access(lhs
);
833 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
834 * but not post_inc) need the converted assigned value as an rvalue
835 * to handle things like:
840 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
842 instructions
->push_tail(var
);
843 instructions
->push_tail(assign(var
, rhs
));
845 if (!error_emitted
) {
846 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
847 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
849 ir_rvalue
*rvalue
= new(ctx
) ir_dereference_variable(var
);
851 if (extract_channel
) {
852 rvalue
= new(ctx
) ir_expression(ir_binop_vector_extract
,
854 extract_channel
->clone(ctx
, NULL
));
857 *out_rvalue
= rvalue
;
860 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
864 return error_emitted
;
868 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
870 void *ctx
= ralloc_parent(lvalue
);
873 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
875 instructions
->push_tail(var
);
877 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
880 return new(ctx
) ir_dereference_variable(var
);
885 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
894 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
895 struct _mesa_glsl_parse_state
*state
)
897 (void)hir(instructions
, state
);
901 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
902 struct _mesa_glsl_parse_state
*state
)
904 (void)hir(instructions
, state
);
908 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
911 ir_rvalue
*cmp
= NULL
;
913 if (operation
== ir_binop_all_equal
)
914 join_op
= ir_binop_logic_and
;
916 join_op
= ir_binop_logic_or
;
918 switch (op0
->type
->base_type
) {
919 case GLSL_TYPE_FLOAT
:
923 case GLSL_TYPE_DOUBLE
:
924 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
926 case GLSL_TYPE_ARRAY
: {
927 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
928 ir_rvalue
*e0
, *e1
, *result
;
930 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
931 new(mem_ctx
) ir_constant(i
));
932 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
933 new(mem_ctx
) ir_constant(i
));
934 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
937 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
943 mark_whole_array_access(op0
);
944 mark_whole_array_access(op1
);
948 case GLSL_TYPE_STRUCT
: {
949 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
950 ir_rvalue
*e0
, *e1
, *result
;
951 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
953 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
955 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
957 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
960 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
968 case GLSL_TYPE_ERROR
:
970 case GLSL_TYPE_SAMPLER
:
971 case GLSL_TYPE_IMAGE
:
972 case GLSL_TYPE_INTERFACE
:
973 case GLSL_TYPE_ATOMIC_UINT
:
974 /* I assume a comparison of a struct containing a sampler just
975 * ignores the sampler present in the type.
981 cmp
= new(mem_ctx
) ir_constant(true);
986 /* For logical operations, we want to ensure that the operands are
987 * scalar booleans. If it isn't, emit an error and return a constant
988 * boolean to avoid triggering cascading error messages.
991 get_scalar_boolean_operand(exec_list
*instructions
,
992 struct _mesa_glsl_parse_state
*state
,
993 ast_expression
*parent_expr
,
995 const char *operand_name
,
998 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1000 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1002 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1005 if (!*error_emitted
) {
1006 YYLTYPE loc
= expr
->get_location();
1007 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1009 parent_expr
->operator_string(parent_expr
->oper
));
1010 *error_emitted
= true;
1013 return new(ctx
) ir_constant(true);
1017 * If name refers to a builtin array whose maximum allowed size is less than
1018 * size, report an error and return true. Otherwise return false.
1021 check_builtin_array_max_size(const char *name
, unsigned size
,
1022 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1024 if ((strcmp("gl_TexCoord", name
) == 0)
1025 && (size
> state
->Const
.MaxTextureCoords
)) {
1026 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1028 * "The size [of gl_TexCoord] can be at most
1029 * gl_MaxTextureCoords."
1031 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1032 "be larger than gl_MaxTextureCoords (%u)",
1033 state
->Const
.MaxTextureCoords
);
1034 } else if (strcmp("gl_ClipDistance", name
) == 0
1035 && size
> state
->Const
.MaxClipPlanes
) {
1036 /* From section 7.1 (Vertex Shader Special Variables) of the
1039 * "The gl_ClipDistance array is predeclared as unsized and
1040 * must be sized by the shader either redeclaring it with a
1041 * size or indexing it only with integral constant
1042 * expressions. ... The size can be at most
1043 * gl_MaxClipDistances."
1045 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1046 "be larger than gl_MaxClipDistances (%u)",
1047 state
->Const
.MaxClipPlanes
);
1052 * Create the constant 1, of a which is appropriate for incrementing and
1053 * decrementing values of the given GLSL type. For example, if type is vec4,
1054 * this creates a constant value of 1.0 having type float.
1056 * If the given type is invalid for increment and decrement operators, return
1057 * a floating point 1--the error will be detected later.
1060 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1062 switch (type
->base_type
) {
1063 case GLSL_TYPE_UINT
:
1064 return new(ctx
) ir_constant((unsigned) 1);
1066 return new(ctx
) ir_constant(1);
1068 case GLSL_TYPE_FLOAT
:
1069 return new(ctx
) ir_constant(1.0f
);
1074 ast_expression::hir(exec_list
*instructions
,
1075 struct _mesa_glsl_parse_state
*state
)
1077 return do_hir(instructions
, state
, true);
1081 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1082 struct _mesa_glsl_parse_state
*state
)
1084 do_hir(instructions
, state
, false);
1088 ast_expression::do_hir(exec_list
*instructions
,
1089 struct _mesa_glsl_parse_state
*state
,
1093 static const int operations
[AST_NUM_OPERATORS
] = {
1094 -1, /* ast_assign doesn't convert to ir_expression. */
1095 -1, /* ast_plus doesn't convert to ir_expression. */
1109 ir_binop_any_nequal
,
1119 /* Note: The following block of expression types actually convert
1120 * to multiple IR instructions.
1122 ir_binop_mul
, /* ast_mul_assign */
1123 ir_binop_div
, /* ast_div_assign */
1124 ir_binop_mod
, /* ast_mod_assign */
1125 ir_binop_add
, /* ast_add_assign */
1126 ir_binop_sub
, /* ast_sub_assign */
1127 ir_binop_lshift
, /* ast_ls_assign */
1128 ir_binop_rshift
, /* ast_rs_assign */
1129 ir_binop_bit_and
, /* ast_and_assign */
1130 ir_binop_bit_xor
, /* ast_xor_assign */
1131 ir_binop_bit_or
, /* ast_or_assign */
1133 -1, /* ast_conditional doesn't convert to ir_expression. */
1134 ir_binop_add
, /* ast_pre_inc. */
1135 ir_binop_sub
, /* ast_pre_dec. */
1136 ir_binop_add
, /* ast_post_inc. */
1137 ir_binop_sub
, /* ast_post_dec. */
1138 -1, /* ast_field_selection doesn't conv to ir_expression. */
1139 -1, /* ast_array_index doesn't convert to ir_expression. */
1140 -1, /* ast_function_call doesn't conv to ir_expression. */
1141 -1, /* ast_identifier doesn't convert to ir_expression. */
1142 -1, /* ast_int_constant doesn't convert to ir_expression. */
1143 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1144 -1, /* ast_float_constant doesn't conv to ir_expression. */
1145 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1146 -1, /* ast_sequence doesn't convert to ir_expression. */
1148 ir_rvalue
*result
= NULL
;
1150 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1151 bool error_emitted
= false;
1154 loc
= this->get_location();
1156 switch (this->oper
) {
1158 assert(!"ast_aggregate: Should never get here.");
1162 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1163 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1166 do_assignment(instructions
, state
,
1167 this->subexpressions
[0]->non_lvalue_description
,
1168 op
[0], op
[1], &result
, needs_rvalue
, false,
1169 this->subexpressions
[0]->get_location());
1174 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1176 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1178 error_emitted
= type
->is_error();
1184 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1186 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1188 error_emitted
= type
->is_error();
1190 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1198 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1199 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1201 type
= arithmetic_result_type(op
[0], op
[1],
1202 (this->oper
== ast_mul
),
1204 error_emitted
= type
->is_error();
1206 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1211 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1212 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1214 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1216 assert(operations
[this->oper
] == ir_binop_mod
);
1218 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1220 error_emitted
= type
->is_error();
1225 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1226 error_emitted
= true;
1229 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1230 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1231 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1233 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1235 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1242 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1243 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1245 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1247 /* The relational operators must either generate an error or result
1248 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1250 assert(type
->is_error()
1251 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1252 && type
->is_scalar()));
1254 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1256 error_emitted
= type
->is_error();
1261 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1262 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1264 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1266 * "The equality operators equal (==), and not equal (!=)
1267 * operate on all types. They result in a scalar Boolean. If
1268 * the operand types do not match, then there must be a
1269 * conversion from Section 4.1.10 "Implicit Conversions"
1270 * applied to one operand that can make them match, in which
1271 * case this conversion is done."
1273 if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1274 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1275 || (op
[0]->type
!= op
[1]->type
)) {
1276 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1277 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1278 error_emitted
= true;
1279 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1280 !state
->check_version(120, 300, &loc
,
1281 "array comparisons forbidden")) {
1282 error_emitted
= true;
1283 } else if ((op
[0]->type
->contains_opaque() ||
1284 op
[1]->type
->contains_opaque())) {
1285 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1286 error_emitted
= true;
1289 if (error_emitted
) {
1290 result
= new(ctx
) ir_constant(false);
1292 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1293 assert(result
->type
== glsl_type::bool_type
);
1300 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1301 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1302 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1304 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1306 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1310 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1312 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1313 error_emitted
= true;
1316 if (!op
[0]->type
->is_integer()) {
1317 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1318 error_emitted
= true;
1321 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1322 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1325 case ast_logic_and
: {
1326 exec_list rhs_instructions
;
1327 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1328 "LHS", &error_emitted
);
1329 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1330 "RHS", &error_emitted
);
1332 if (rhs_instructions
.is_empty()) {
1333 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1334 type
= result
->type
;
1336 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1339 instructions
->push_tail(tmp
);
1341 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1342 instructions
->push_tail(stmt
);
1344 stmt
->then_instructions
.append_list(&rhs_instructions
);
1345 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1346 ir_assignment
*const then_assign
=
1347 new(ctx
) ir_assignment(then_deref
, op
[1]);
1348 stmt
->then_instructions
.push_tail(then_assign
);
1350 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1351 ir_assignment
*const else_assign
=
1352 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1353 stmt
->else_instructions
.push_tail(else_assign
);
1355 result
= new(ctx
) ir_dereference_variable(tmp
);
1361 case ast_logic_or
: {
1362 exec_list rhs_instructions
;
1363 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1364 "LHS", &error_emitted
);
1365 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1366 "RHS", &error_emitted
);
1368 if (rhs_instructions
.is_empty()) {
1369 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1370 type
= result
->type
;
1372 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1375 instructions
->push_tail(tmp
);
1377 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1378 instructions
->push_tail(stmt
);
1380 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1381 ir_assignment
*const then_assign
=
1382 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1383 stmt
->then_instructions
.push_tail(then_assign
);
1385 stmt
->else_instructions
.append_list(&rhs_instructions
);
1386 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1387 ir_assignment
*const else_assign
=
1388 new(ctx
) ir_assignment(else_deref
, op
[1]);
1389 stmt
->else_instructions
.push_tail(else_assign
);
1391 result
= new(ctx
) ir_dereference_variable(tmp
);
1398 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1400 * "The logical binary operators and (&&), or ( | | ), and
1401 * exclusive or (^^). They operate only on two Boolean
1402 * expressions and result in a Boolean expression."
1404 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1406 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1409 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1414 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1415 "operand", &error_emitted
);
1417 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1421 case ast_mul_assign
:
1422 case ast_div_assign
:
1423 case ast_add_assign
:
1424 case ast_sub_assign
: {
1425 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1426 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1428 type
= arithmetic_result_type(op
[0], op
[1],
1429 (this->oper
== ast_mul_assign
),
1432 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1436 do_assignment(instructions
, state
,
1437 this->subexpressions
[0]->non_lvalue_description
,
1438 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1439 &result
, needs_rvalue
, false,
1440 this->subexpressions
[0]->get_location());
1442 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1443 * explicitly test for this because none of the binary expression
1444 * operators allow array operands either.
1450 case ast_mod_assign
: {
1451 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1452 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1454 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1456 assert(operations
[this->oper
] == ir_binop_mod
);
1458 ir_rvalue
*temp_rhs
;
1459 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1463 do_assignment(instructions
, state
,
1464 this->subexpressions
[0]->non_lvalue_description
,
1465 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1466 &result
, needs_rvalue
, false,
1467 this->subexpressions
[0]->get_location());
1472 case ast_rs_assign
: {
1473 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1474 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1475 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1477 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1478 type
, op
[0], op
[1]);
1480 do_assignment(instructions
, state
,
1481 this->subexpressions
[0]->non_lvalue_description
,
1482 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1483 &result
, needs_rvalue
, false,
1484 this->subexpressions
[0]->get_location());
1488 case ast_and_assign
:
1489 case ast_xor_assign
:
1490 case ast_or_assign
: {
1491 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1492 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1493 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1495 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1496 type
, op
[0], op
[1]);
1498 do_assignment(instructions
, state
,
1499 this->subexpressions
[0]->non_lvalue_description
,
1500 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1501 &result
, needs_rvalue
, false,
1502 this->subexpressions
[0]->get_location());
1506 case ast_conditional
: {
1507 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1509 * "The ternary selection operator (?:). It operates on three
1510 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1511 * first expression, which must result in a scalar Boolean."
1513 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1514 "condition", &error_emitted
);
1516 /* The :? operator is implemented by generating an anonymous temporary
1517 * followed by an if-statement. The last instruction in each branch of
1518 * the if-statement assigns a value to the anonymous temporary. This
1519 * temporary is the r-value of the expression.
1521 exec_list then_instructions
;
1522 exec_list else_instructions
;
1524 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1525 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1527 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1529 * "The second and third expressions can be any type, as
1530 * long their types match, or there is a conversion in
1531 * Section 4.1.10 "Implicit Conversions" that can be applied
1532 * to one of the expressions to make their types match. This
1533 * resulting matching type is the type of the entire
1536 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1537 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1538 || (op
[1]->type
!= op
[2]->type
)) {
1539 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1541 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1542 "operator must have matching types");
1543 error_emitted
= true;
1544 type
= glsl_type::error_type
;
1549 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1551 * "The second and third expressions must be the same type, but can
1552 * be of any type other than an array."
1554 if (type
->is_array() &&
1555 !state
->check_version(120, 300, &loc
,
1556 "second and third operands of ?: operator "
1557 "cannot be arrays")) {
1558 error_emitted
= true;
1561 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1563 * "Except for array indexing, structure member selection, and
1564 * parentheses, opaque variables are not allowed to be operands in
1565 * expressions; such use results in a compile-time error."
1567 if (type
->contains_opaque()) {
1568 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1569 "of the ?: operator");
1570 error_emitted
= true;
1573 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1575 if (then_instructions
.is_empty()
1576 && else_instructions
.is_empty()
1577 && cond_val
!= NULL
) {
1578 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1580 /* The copy to conditional_tmp reads the whole array. */
1581 if (type
->is_array()) {
1582 mark_whole_array_access(op
[1]);
1583 mark_whole_array_access(op
[2]);
1586 ir_variable
*const tmp
=
1587 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1588 instructions
->push_tail(tmp
);
1590 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1591 instructions
->push_tail(stmt
);
1593 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1594 ir_dereference
*const then_deref
=
1595 new(ctx
) ir_dereference_variable(tmp
);
1596 ir_assignment
*const then_assign
=
1597 new(ctx
) ir_assignment(then_deref
, op
[1]);
1598 stmt
->then_instructions
.push_tail(then_assign
);
1600 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1601 ir_dereference
*const else_deref
=
1602 new(ctx
) ir_dereference_variable(tmp
);
1603 ir_assignment
*const else_assign
=
1604 new(ctx
) ir_assignment(else_deref
, op
[2]);
1605 stmt
->else_instructions
.push_tail(else_assign
);
1607 result
= new(ctx
) ir_dereference_variable(tmp
);
1614 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1615 ? "pre-increment operation" : "pre-decrement operation";
1617 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1618 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1620 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1622 ir_rvalue
*temp_rhs
;
1623 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1627 do_assignment(instructions
, state
,
1628 this->subexpressions
[0]->non_lvalue_description
,
1629 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1630 &result
, needs_rvalue
, false,
1631 this->subexpressions
[0]->get_location());
1636 case ast_post_dec
: {
1637 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1638 ? "post-increment operation" : "post-decrement operation";
1639 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1640 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1642 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1644 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1646 ir_rvalue
*temp_rhs
;
1647 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1650 /* Get a temporary of a copy of the lvalue before it's modified.
1651 * This may get thrown away later.
1653 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1655 ir_rvalue
*junk_rvalue
;
1657 do_assignment(instructions
, state
,
1658 this->subexpressions
[0]->non_lvalue_description
,
1659 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1660 &junk_rvalue
, false, false,
1661 this->subexpressions
[0]->get_location());
1666 case ast_field_selection
:
1667 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1670 case ast_array_index
: {
1671 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1673 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1674 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1676 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1679 if (result
->type
->is_error())
1680 error_emitted
= true;
1685 case ast_function_call
:
1686 /* Should *NEVER* get here. ast_function_call should always be handled
1687 * by ast_function_expression::hir.
1692 case ast_identifier
: {
1693 /* ast_identifier can appear several places in a full abstract syntax
1694 * tree. This particular use must be at location specified in the grammar
1695 * as 'variable_identifier'.
1698 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1701 var
->data
.used
= true;
1702 result
= new(ctx
) ir_dereference_variable(var
);
1704 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1705 this->primary_expression
.identifier
);
1707 result
= ir_rvalue::error_value(ctx
);
1708 error_emitted
= true;
1713 case ast_int_constant
:
1714 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1717 case ast_uint_constant
:
1718 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1721 case ast_float_constant
:
1722 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1725 case ast_bool_constant
:
1726 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1729 case ast_double_constant
:
1730 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1733 case ast_sequence
: {
1734 /* It should not be possible to generate a sequence in the AST without
1735 * any expressions in it.
1737 assert(!this->expressions
.is_empty());
1739 /* The r-value of a sequence is the last expression in the sequence. If
1740 * the other expressions in the sequence do not have side-effects (and
1741 * therefore add instructions to the instruction list), they get dropped
1744 exec_node
*previous_tail_pred
= NULL
;
1745 YYLTYPE previous_operand_loc
= loc
;
1747 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1748 /* If one of the operands of comma operator does not generate any
1749 * code, we want to emit a warning. At each pass through the loop
1750 * previous_tail_pred will point to the last instruction in the
1751 * stream *before* processing the previous operand. Naturally,
1752 * instructions->tail_pred will point to the last instruction in the
1753 * stream *after* processing the previous operand. If the two
1754 * pointers match, then the previous operand had no effect.
1756 * The warning behavior here differs slightly from GCC. GCC will
1757 * only emit a warning if none of the left-hand operands have an
1758 * effect. However, it will emit a warning for each. I believe that
1759 * there are some cases in C (especially with GCC extensions) where
1760 * it is useful to have an intermediate step in a sequence have no
1761 * effect, but I don't think these cases exist in GLSL. Either way,
1762 * it would be a giant hassle to replicate that behavior.
1764 if (previous_tail_pred
== instructions
->tail_pred
) {
1765 _mesa_glsl_warning(&previous_operand_loc
, state
,
1766 "left-hand operand of comma expression has "
1770 /* tail_pred is directly accessed instead of using the get_tail()
1771 * method for performance reasons. get_tail() has extra code to
1772 * return NULL when the list is empty. We don't care about that
1773 * here, so using tail_pred directly is fine.
1775 previous_tail_pred
= instructions
->tail_pred
;
1776 previous_operand_loc
= ast
->get_location();
1778 result
= ast
->hir(instructions
, state
);
1781 /* Any errors should have already been emitted in the loop above.
1783 error_emitted
= true;
1787 type
= NULL
; /* use result->type, not type. */
1788 assert(result
!= NULL
|| !needs_rvalue
);
1790 if (result
&& result
->type
->is_error() && !error_emitted
)
1791 _mesa_glsl_error(& loc
, state
, "type mismatch");
1798 ast_expression_statement::hir(exec_list
*instructions
,
1799 struct _mesa_glsl_parse_state
*state
)
1801 /* It is possible to have expression statements that don't have an
1802 * expression. This is the solitary semicolon:
1804 * for (i = 0; i < 5; i++)
1807 * In this case the expression will be NULL. Test for NULL and don't do
1808 * anything in that case.
1810 if (expression
!= NULL
)
1811 expression
->hir_no_rvalue(instructions
, state
);
1813 /* Statements do not have r-values.
1820 ast_compound_statement::hir(exec_list
*instructions
,
1821 struct _mesa_glsl_parse_state
*state
)
1824 state
->symbols
->push_scope();
1826 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1827 ast
->hir(instructions
, state
);
1830 state
->symbols
->pop_scope();
1832 /* Compound statements do not have r-values.
1838 * Evaluate the given exec_node (which should be an ast_node representing
1839 * a single array dimension) and return its integer value.
1842 process_array_size(exec_node
*node
,
1843 struct _mesa_glsl_parse_state
*state
)
1845 exec_list dummy_instructions
;
1847 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
1848 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1849 YYLTYPE loc
= array_size
->get_location();
1852 _mesa_glsl_error(& loc
, state
,
1853 "array size could not be resolved");
1857 if (!ir
->type
->is_integer()) {
1858 _mesa_glsl_error(& loc
, state
,
1859 "array size must be integer type");
1863 if (!ir
->type
->is_scalar()) {
1864 _mesa_glsl_error(& loc
, state
,
1865 "array size must be scalar type");
1869 ir_constant
*const size
= ir
->constant_expression_value();
1871 _mesa_glsl_error(& loc
, state
, "array size must be a "
1872 "constant valued expression");
1876 if (size
->value
.i
[0] <= 0) {
1877 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1881 assert(size
->type
== ir
->type
);
1883 /* If the array size is const (and we've verified that
1884 * it is) then no instructions should have been emitted
1885 * when we converted it to HIR. If they were emitted,
1886 * then either the array size isn't const after all, or
1887 * we are emitting unnecessary instructions.
1889 assert(dummy_instructions
.is_empty());
1891 return size
->value
.u
[0];
1894 static const glsl_type
*
1895 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
1896 ast_array_specifier
*array_specifier
,
1897 struct _mesa_glsl_parse_state
*state
)
1899 const glsl_type
*array_type
= base
;
1901 if (array_specifier
!= NULL
) {
1902 if (base
->is_array()) {
1904 /* From page 19 (page 25) of the GLSL 1.20 spec:
1906 * "Only one-dimensional arrays may be declared."
1908 if (!state
->ARB_arrays_of_arrays_enable
) {
1909 _mesa_glsl_error(loc
, state
,
1910 "invalid array of `%s'"
1911 "GL_ARB_arrays_of_arrays "
1912 "required for defining arrays of arrays",
1914 return glsl_type::error_type
;
1917 if (base
->length
== 0) {
1918 _mesa_glsl_error(loc
, state
,
1919 "only the outermost array dimension can "
1922 return glsl_type::error_type
;
1926 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
1927 !node
->is_head_sentinel(); node
= node
->prev
) {
1928 unsigned array_size
= process_array_size(node
, state
);
1929 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
1932 if (array_specifier
->is_unsized_array
)
1933 array_type
= glsl_type::get_array_instance(array_type
, 0);
1941 ast_type_specifier::glsl_type(const char **name
,
1942 struct _mesa_glsl_parse_state
*state
) const
1944 const struct glsl_type
*type
;
1946 type
= state
->symbols
->get_type(this->type_name
);
1947 *name
= this->type_name
;
1949 YYLTYPE loc
= this->get_location();
1950 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
1956 ast_fully_specified_type::glsl_type(const char **name
,
1957 struct _mesa_glsl_parse_state
*state
) const
1959 const struct glsl_type
*type
= this->specifier
->glsl_type(name
, state
);
1964 if (type
->base_type
== GLSL_TYPE_FLOAT
1966 && state
->stage
== MESA_SHADER_FRAGMENT
1967 && this->qualifier
.precision
== ast_precision_none
1968 && state
->symbols
->get_variable("#default precision") == NULL
) {
1969 YYLTYPE loc
= this->get_location();
1970 _mesa_glsl_error(&loc
, state
,
1971 "no precision specified this scope for type `%s'",
1979 * Determine whether a toplevel variable declaration declares a varying. This
1980 * function operates by examining the variable's mode and the shader target,
1981 * so it correctly identifies linkage variables regardless of whether they are
1982 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
1984 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
1985 * this function will produce undefined results.
1988 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
1991 case MESA_SHADER_VERTEX
:
1992 return var
->data
.mode
== ir_var_shader_out
;
1993 case MESA_SHADER_FRAGMENT
:
1994 return var
->data
.mode
== ir_var_shader_in
;
1996 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2002 * Matrix layout qualifiers are only allowed on certain types
2005 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2007 const glsl_type
*type
,
2010 if (var
&& !var
->is_in_uniform_block()) {
2011 /* Layout qualifiers may only apply to interface blocks and fields in
2014 _mesa_glsl_error(loc
, state
,
2015 "uniform block layout qualifiers row_major and "
2016 "column_major may not be applied to variables "
2017 "outside of uniform blocks");
2018 } else if (!type
->is_matrix()) {
2019 /* The OpenGL ES 3.0 conformance tests did not originally allow
2020 * matrix layout qualifiers on non-matrices. However, the OpenGL
2021 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2022 * amended to specifically allow these layouts on all types. Emit
2023 * a warning so that people know their code may not be portable.
2025 _mesa_glsl_warning(loc
, state
,
2026 "uniform block layout qualifiers row_major and "
2027 "column_major applied to non-matrix types may "
2028 "be rejected by older compilers");
2029 } else if (type
->is_record()) {
2030 /* We allow 'layout(row_major)' on structure types because it's the only
2031 * way to get row-major layouts on matrices contained in structures.
2033 _mesa_glsl_warning(loc
, state
,
2034 "uniform block layout qualifiers row_major and "
2035 "column_major applied to structure types is not "
2036 "strictly conformant and may be rejected by other "
2042 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
2045 const ast_type_qualifier
*qual
)
2047 if (var
->data
.mode
!= ir_var_uniform
) {
2048 _mesa_glsl_error(loc
, state
,
2049 "the \"binding\" qualifier only applies to uniforms");
2053 if (qual
->binding
< 0) {
2054 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
2058 const struct gl_context
*const ctx
= state
->ctx
;
2059 unsigned elements
= var
->type
->is_array() ? var
->type
->length
: 1;
2060 unsigned max_index
= qual
->binding
+ elements
- 1;
2062 if (var
->type
->is_interface()) {
2063 /* UBOs. From page 60 of the GLSL 4.20 specification:
2064 * "If the binding point for any uniform block instance is less than zero,
2065 * or greater than or equal to the implementation-dependent maximum
2066 * number of uniform buffer bindings, a compilation error will occur.
2067 * When the binding identifier is used with a uniform block instanced as
2068 * an array of size N, all elements of the array from binding through
2069 * binding + N – 1 must be within this range."
2071 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2073 if (max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2074 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
2075 "the maximum number of UBO binding points (%d)",
2076 qual
->binding
, elements
,
2077 ctx
->Const
.MaxUniformBufferBindings
);
2080 } else if (var
->type
->is_sampler() ||
2081 (var
->type
->is_array() && var
->type
->fields
.array
->is_sampler())) {
2082 /* Samplers. From page 63 of the GLSL 4.20 specification:
2083 * "If the binding is less than zero, or greater than or equal to the
2084 * implementation-dependent maximum supported number of units, a
2085 * compilation error will occur. When the binding identifier is used
2086 * with an array of size N, all elements of the array from binding
2087 * through binding + N - 1 must be within this range."
2089 unsigned limit
= ctx
->Const
.Program
[state
->stage
].MaxTextureImageUnits
;
2091 if (max_index
>= limit
) {
2092 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2093 "exceeds the maximum number of texture image units "
2094 "(%d)", qual
->binding
, elements
, limit
);
2098 } else if (var
->type
->contains_atomic()) {
2099 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2100 if (unsigned(qual
->binding
) >= ctx
->Const
.MaxAtomicBufferBindings
) {
2101 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2102 " maximum number of atomic counter buffer bindings"
2103 "(%d)", qual
->binding
,
2104 ctx
->Const
.MaxAtomicBufferBindings
);
2109 _mesa_glsl_error(loc
, state
,
2110 "the \"binding\" qualifier only applies to uniform "
2111 "blocks, samplers, atomic counters, or arrays thereof");
2119 static glsl_interp_qualifier
2120 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2121 ir_variable_mode mode
,
2122 struct _mesa_glsl_parse_state
*state
,
2125 glsl_interp_qualifier interpolation
;
2126 if (qual
->flags
.q
.flat
)
2127 interpolation
= INTERP_QUALIFIER_FLAT
;
2128 else if (qual
->flags
.q
.noperspective
)
2129 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2130 else if (qual
->flags
.q
.smooth
)
2131 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2133 interpolation
= INTERP_QUALIFIER_NONE
;
2135 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2136 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2137 _mesa_glsl_error(loc
, state
,
2138 "interpolation qualifier `%s' can only be applied to "
2139 "shader inputs or outputs.",
2140 interpolation_string(interpolation
));
2144 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2145 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2146 _mesa_glsl_error(loc
, state
,
2147 "interpolation qualifier `%s' cannot be applied to "
2148 "vertex shader inputs or fragment shader outputs",
2149 interpolation_string(interpolation
));
2153 return interpolation
;
2158 validate_explicit_location(const struct ast_type_qualifier
*qual
,
2160 struct _mesa_glsl_parse_state
*state
,
2165 /* Checks for GL_ARB_explicit_uniform_location. */
2166 if (qual
->flags
.q
.uniform
) {
2167 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2170 const struct gl_context
*const ctx
= state
->ctx
;
2171 unsigned max_loc
= qual
->location
+ var
->type
->uniform_locations() - 1;
2173 /* ARB_explicit_uniform_location specification states:
2175 * "The explicitly defined locations and the generated locations
2176 * must be in the range of 0 to MAX_UNIFORM_LOCATIONS minus one."
2178 * "Valid locations for default-block uniform variable locations
2179 * are in the range of 0 to the implementation-defined maximum
2180 * number of uniform locations."
2182 if (qual
->location
< 0) {
2183 _mesa_glsl_error(loc
, state
,
2184 "explicit location < 0 for uniform %s", var
->name
);
2188 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2189 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2190 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2191 ctx
->Const
.MaxUserAssignableUniformLocations
);
2195 var
->data
.explicit_location
= true;
2196 var
->data
.location
= qual
->location
;
2200 /* Between GL_ARB_explicit_attrib_location an
2201 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2202 * stage can be assigned explicit locations. The checking here associates
2203 * the correct extension with the correct stage's input / output:
2207 * vertex explicit_loc sso
2209 * fragment sso explicit_loc
2211 switch (state
->stage
) {
2212 case MESA_SHADER_VERTEX
:
2213 if (var
->data
.mode
== ir_var_shader_in
) {
2214 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2220 if (var
->data
.mode
== ir_var_shader_out
) {
2221 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2230 case MESA_SHADER_GEOMETRY
:
2231 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2232 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2241 case MESA_SHADER_FRAGMENT
:
2242 if (var
->data
.mode
== ir_var_shader_in
) {
2243 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2249 if (var
->data
.mode
== ir_var_shader_out
) {
2250 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2259 case MESA_SHADER_COMPUTE
:
2260 _mesa_glsl_error(loc
, state
,
2261 "compute shader variables cannot be given "
2262 "explicit locations");
2267 _mesa_glsl_error(loc
, state
,
2268 "%s cannot be given an explicit location in %s shader",
2270 _mesa_shader_stage_to_string(state
->stage
));
2272 var
->data
.explicit_location
= true;
2274 /* This bit of silliness is needed because invalid explicit locations
2275 * are supposed to be flagged during linking. Small negative values
2276 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2277 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2278 * The linker needs to be able to differentiate these cases. This
2279 * ensures that negative values stay negative.
2281 if (qual
->location
>= 0) {
2282 switch (state
->stage
) {
2283 case MESA_SHADER_VERTEX
:
2284 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2285 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2286 : (qual
->location
+ VARYING_SLOT_VAR0
);
2289 case MESA_SHADER_GEOMETRY
:
2290 var
->data
.location
= qual
->location
+ VARYING_SLOT_VAR0
;
2293 case MESA_SHADER_FRAGMENT
:
2294 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2295 ? (qual
->location
+ FRAG_RESULT_DATA0
)
2296 : (qual
->location
+ VARYING_SLOT_VAR0
);
2298 case MESA_SHADER_COMPUTE
:
2299 assert(!"Unexpected shader type");
2303 var
->data
.location
= qual
->location
;
2306 if (qual
->flags
.q
.explicit_index
) {
2307 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2308 * Layout Qualifiers):
2310 * "It is also a compile-time error if a fragment shader
2311 * sets a layout index to less than 0 or greater than 1."
2313 * Older specifications don't mandate a behavior; we take
2314 * this as a clarification and always generate the error.
2316 if (qual
->index
< 0 || qual
->index
> 1) {
2317 _mesa_glsl_error(loc
, state
,
2318 "explicit index may only be 0 or 1");
2320 var
->data
.explicit_index
= true;
2321 var
->data
.index
= qual
->index
;
2328 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2330 struct _mesa_glsl_parse_state
*state
,
2333 const glsl_type
*base_type
= var
->type
->without_array();
2335 if (base_type
->is_image()) {
2336 if (var
->data
.mode
!= ir_var_uniform
&&
2337 var
->data
.mode
!= ir_var_function_in
) {
2338 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2339 "function parameters or uniform-qualified "
2340 "global variables");
2343 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2344 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2345 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2346 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2347 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2348 var
->data
.read_only
= true;
2350 if (qual
->flags
.q
.explicit_image_format
) {
2351 if (var
->data
.mode
== ir_var_function_in
) {
2352 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2353 "used on image function parameters");
2356 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2357 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2358 "base data type of the image");
2361 var
->data
.image_format
= qual
->image_format
;
2363 if (var
->data
.mode
== ir_var_uniform
&& !qual
->flags
.q
.write_only
) {
2364 _mesa_glsl_error(loc
, state
, "uniforms not qualified with "
2365 "`writeonly' must have a format layout "
2369 var
->data
.image_format
= GL_NONE
;
2371 } else if (qual
->flags
.q
.read_only
||
2372 qual
->flags
.q
.write_only
||
2373 qual
->flags
.q
.coherent
||
2374 qual
->flags
.q
._volatile
||
2375 qual
->flags
.q
.restrict_flag
||
2376 qual
->flags
.q
.explicit_image_format
) {
2377 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
2382 static inline const char*
2383 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
2385 if (origin_upper_left
&& pixel_center_integer
)
2386 return "origin_upper_left, pixel_center_integer";
2387 else if (origin_upper_left
)
2388 return "origin_upper_left";
2389 else if (pixel_center_integer
)
2390 return "pixel_center_integer";
2396 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
2397 const struct ast_type_qualifier
*qual
)
2399 /* If gl_FragCoord was previously declared, and the qualifiers were
2400 * different in any way, return true.
2402 if (state
->fs_redeclares_gl_fragcoord
) {
2403 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
2404 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
2411 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2413 struct _mesa_glsl_parse_state
*state
,
2417 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
2419 if (qual
->flags
.q
.invariant
) {
2420 if (var
->data
.used
) {
2421 _mesa_glsl_error(loc
, state
,
2422 "variable `%s' may not be redeclared "
2423 "`invariant' after being used",
2426 var
->data
.invariant
= 1;
2430 if (qual
->flags
.q
.precise
) {
2431 if (var
->data
.used
) {
2432 _mesa_glsl_error(loc
, state
,
2433 "variable `%s' may not be redeclared "
2434 "`precise' after being used",
2437 var
->data
.precise
= 1;
2441 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
2442 || qual
->flags
.q
.uniform
2443 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2444 var
->data
.read_only
= 1;
2446 if (qual
->flags
.q
.centroid
)
2447 var
->data
.centroid
= 1;
2449 if (qual
->flags
.q
.sample
)
2450 var
->data
.sample
= 1;
2452 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
2453 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
2454 var
->data
.stream
= qual
->stream
;
2457 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
2458 var
->type
= glsl_type::error_type
;
2459 _mesa_glsl_error(loc
, state
,
2460 "`attribute' variables may not be declared in the "
2462 _mesa_shader_stage_to_string(state
->stage
));
2465 /* Disallow layout qualifiers which may only appear on layout declarations. */
2466 if (qual
->flags
.q
.prim_type
) {
2467 _mesa_glsl_error(loc
, state
,
2468 "Primitive type may only be specified on GS input or output "
2469 "layout declaration, not on variables.");
2472 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2474 * "However, the const qualifier cannot be used with out or inout."
2476 * The same section of the GLSL 4.40 spec further clarifies this saying:
2478 * "The const qualifier cannot be used with out or inout, or a
2479 * compile-time error results."
2481 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2482 _mesa_glsl_error(loc
, state
,
2483 "`const' may not be applied to `out' or `inout' "
2484 "function parameters");
2487 /* If there is no qualifier that changes the mode of the variable, leave
2488 * the setting alone.
2490 assert(var
->data
.mode
!= ir_var_temporary
);
2491 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2492 var
->data
.mode
= ir_var_function_inout
;
2493 else if (qual
->flags
.q
.in
)
2494 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2495 else if (qual
->flags
.q
.attribute
2496 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2497 var
->data
.mode
= ir_var_shader_in
;
2498 else if (qual
->flags
.q
.out
)
2499 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2500 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
2501 var
->data
.mode
= ir_var_shader_out
;
2502 else if (qual
->flags
.q
.uniform
)
2503 var
->data
.mode
= ir_var_uniform
;
2505 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
2506 /* User-defined ins/outs are not permitted in compute shaders. */
2507 if (state
->stage
== MESA_SHADER_COMPUTE
) {
2508 _mesa_glsl_error(loc
, state
,
2509 "user-defined input and output variables are not "
2510 "permitted in compute shaders");
2513 /* This variable is being used to link data between shader stages (in
2514 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2515 * that is allowed for such purposes.
2517 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2519 * "The varying qualifier can be used only with the data types
2520 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2523 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2524 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2526 * "Fragment inputs can only be signed and unsigned integers and
2527 * integer vectors, float, floating-point vectors, matrices, or
2528 * arrays of these. Structures cannot be input.
2530 * Similar text exists in the section on vertex shader outputs.
2532 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2533 * 3.00 spec allows structs as well. Varying structs are also allowed
2536 switch (var
->type
->get_scalar_type()->base_type
) {
2537 case GLSL_TYPE_FLOAT
:
2538 /* Ok in all GLSL versions */
2540 case GLSL_TYPE_UINT
:
2542 if (state
->is_version(130, 300))
2544 _mesa_glsl_error(loc
, state
,
2545 "varying variables must be of base type float in %s",
2546 state
->get_version_string());
2548 case GLSL_TYPE_STRUCT
:
2549 if (state
->is_version(150, 300))
2551 _mesa_glsl_error(loc
, state
,
2552 "varying variables may not be of type struct");
2554 case GLSL_TYPE_DOUBLE
:
2557 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2562 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2563 switch (state
->stage
) {
2564 case MESA_SHADER_VERTEX
:
2565 if (var
->data
.mode
== ir_var_shader_out
)
2566 var
->data
.invariant
= true;
2568 case MESA_SHADER_GEOMETRY
:
2569 if ((var
->data
.mode
== ir_var_shader_in
)
2570 || (var
->data
.mode
== ir_var_shader_out
))
2571 var
->data
.invariant
= true;
2573 case MESA_SHADER_FRAGMENT
:
2574 if (var
->data
.mode
== ir_var_shader_in
)
2575 var
->data
.invariant
= true;
2577 case MESA_SHADER_COMPUTE
:
2578 /* Invariance isn't meaningful in compute shaders. */
2583 var
->data
.interpolation
=
2584 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
2587 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2588 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2589 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2590 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2591 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2592 ? "origin_upper_left" : "pixel_center_integer";
2594 _mesa_glsl_error(loc
, state
,
2595 "layout qualifier `%s' can only be applied to "
2596 "fragment shader input `gl_FragCoord'",
2600 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
2602 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
2604 * "Within any shader, the first redeclarations of gl_FragCoord
2605 * must appear before any use of gl_FragCoord."
2607 * Generate a compiler error if above condition is not met by the
2610 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
2611 if (earlier
!= NULL
&&
2612 earlier
->data
.used
&&
2613 !state
->fs_redeclares_gl_fragcoord
) {
2614 _mesa_glsl_error(loc
, state
,
2615 "gl_FragCoord used before its first redeclaration "
2616 "in fragment shader");
2619 /* Make sure all gl_FragCoord redeclarations specify the same layout
2622 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
2623 const char *const qual_string
=
2624 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
2625 qual
->flags
.q
.pixel_center_integer
);
2627 const char *const state_string
=
2628 get_layout_qualifier_string(state
->fs_origin_upper_left
,
2629 state
->fs_pixel_center_integer
);
2631 _mesa_glsl_error(loc
, state
,
2632 "gl_FragCoord redeclared with different layout "
2633 "qualifiers (%s) and (%s) ",
2637 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2638 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2639 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
2640 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
2641 state
->fs_redeclares_gl_fragcoord
=
2642 state
->fs_origin_upper_left
||
2643 state
->fs_pixel_center_integer
||
2644 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
2647 if (qual
->flags
.q
.explicit_location
) {
2648 validate_explicit_location(qual
, var
, state
, loc
);
2649 } else if (qual
->flags
.q
.explicit_index
) {
2650 _mesa_glsl_error(loc
, state
, "explicit index requires explicit location");
2653 if (qual
->flags
.q
.explicit_binding
&&
2654 validate_binding_qualifier(state
, loc
, var
, qual
)) {
2655 var
->data
.explicit_binding
= true;
2656 var
->data
.binding
= qual
->binding
;
2659 if (var
->type
->contains_atomic()) {
2660 if (var
->data
.mode
== ir_var_uniform
) {
2661 if (var
->data
.explicit_binding
) {
2663 &state
->atomic_counter_offsets
[var
->data
.binding
];
2665 if (*offset
% ATOMIC_COUNTER_SIZE
)
2666 _mesa_glsl_error(loc
, state
,
2667 "misaligned atomic counter offset");
2669 var
->data
.atomic
.offset
= *offset
;
2670 *offset
+= var
->type
->atomic_size();
2673 _mesa_glsl_error(loc
, state
,
2674 "atomic counters require explicit binding point");
2676 } else if (var
->data
.mode
!= ir_var_function_in
) {
2677 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
2678 "function parameters or uniform-qualified "
2679 "global variables");
2683 /* Does the declaration use the deprecated 'attribute' or 'varying'
2686 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2687 || qual
->flags
.q
.varying
;
2690 /* Validate auxiliary storage qualifiers */
2692 /* From section 4.3.4 of the GLSL 1.30 spec:
2693 * "It is an error to use centroid in in a vertex shader."
2695 * From section 4.3.4 of the GLSL ES 3.00 spec:
2696 * "It is an error to use centroid in or interpolation qualifiers in
2697 * a vertex shader input."
2700 /* Section 4.3.6 of the GLSL 1.30 specification states:
2701 * "It is an error to use centroid out in a fragment shader."
2703 * The GL_ARB_shading_language_420pack extension specification states:
2704 * "It is an error to use auxiliary storage qualifiers or interpolation
2705 * qualifiers on an output in a fragment shader."
2707 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
2708 _mesa_glsl_error(loc
, state
,
2709 "sample qualifier may only be used on `in` or `out` "
2710 "variables between shader stages");
2712 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
2713 _mesa_glsl_error(loc
, state
,
2714 "centroid qualifier may only be used with `in', "
2715 "`out' or `varying' variables between shader stages");
2719 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2720 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2721 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2722 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2723 * These extensions and all following extensions that add the 'layout'
2724 * keyword have been modified to require the use of 'in' or 'out'.
2726 * The following extension do not allow the deprecated keywords:
2728 * GL_AMD_conservative_depth
2729 * GL_ARB_conservative_depth
2730 * GL_ARB_gpu_shader5
2731 * GL_ARB_separate_shader_objects
2732 * GL_ARB_tesselation_shader
2733 * GL_ARB_transform_feedback3
2734 * GL_ARB_uniform_buffer_object
2736 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2737 * allow layout with the deprecated keywords.
2739 const bool relaxed_layout_qualifier_checking
=
2740 state
->ARB_fragment_coord_conventions_enable
;
2742 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2743 if (relaxed_layout_qualifier_checking
) {
2744 _mesa_glsl_warning(loc
, state
,
2745 "`layout' qualifier may not be used with "
2746 "`attribute' or `varying'");
2748 _mesa_glsl_error(loc
, state
,
2749 "`layout' qualifier may not be used with "
2750 "`attribute' or `varying'");
2754 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2755 * AMD_conservative_depth.
2757 int depth_layout_count
= qual
->flags
.q
.depth_any
2758 + qual
->flags
.q
.depth_greater
2759 + qual
->flags
.q
.depth_less
2760 + qual
->flags
.q
.depth_unchanged
;
2761 if (depth_layout_count
> 0
2762 && !state
->AMD_conservative_depth_enable
2763 && !state
->ARB_conservative_depth_enable
) {
2764 _mesa_glsl_error(loc
, state
,
2765 "extension GL_AMD_conservative_depth or "
2766 "GL_ARB_conservative_depth must be enabled "
2767 "to use depth layout qualifiers");
2768 } else if (depth_layout_count
> 0
2769 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2770 _mesa_glsl_error(loc
, state
,
2771 "depth layout qualifiers can be applied only to "
2773 } else if (depth_layout_count
> 1
2774 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2775 _mesa_glsl_error(loc
, state
,
2776 "at most one depth layout qualifier can be applied to "
2779 if (qual
->flags
.q
.depth_any
)
2780 var
->data
.depth_layout
= ir_depth_layout_any
;
2781 else if (qual
->flags
.q
.depth_greater
)
2782 var
->data
.depth_layout
= ir_depth_layout_greater
;
2783 else if (qual
->flags
.q
.depth_less
)
2784 var
->data
.depth_layout
= ir_depth_layout_less
;
2785 else if (qual
->flags
.q
.depth_unchanged
)
2786 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
2788 var
->data
.depth_layout
= ir_depth_layout_none
;
2790 if (qual
->flags
.q
.std140
||
2791 qual
->flags
.q
.packed
||
2792 qual
->flags
.q
.shared
) {
2793 _mesa_glsl_error(loc
, state
,
2794 "uniform block layout qualifiers std140, packed, and "
2795 "shared can only be applied to uniform blocks, not "
2799 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2800 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
2803 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
2805 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
2808 * "Fragment shaders also allow the following layout qualifier on in only
2809 * (not with variable declarations)
2810 * layout-qualifier-id
2811 * early_fragment_tests
2814 if (qual
->flags
.q
.early_fragment_tests
) {
2815 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
2816 "valid in fragment shader input layout declaration.");
2821 * Get the variable that is being redeclared by this declaration
2823 * Semantic checks to verify the validity of the redeclaration are also
2824 * performed. If semantic checks fail, compilation error will be emitted via
2825 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2828 * A pointer to an existing variable in the current scope if the declaration
2829 * is a redeclaration, \c NULL otherwise.
2831 static ir_variable
*
2832 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
2833 struct _mesa_glsl_parse_state
*state
,
2834 bool allow_all_redeclarations
)
2836 /* Check if this declaration is actually a re-declaration, either to
2837 * resize an array or add qualifiers to an existing variable.
2839 * This is allowed for variables in the current scope, or when at
2840 * global scope (for built-ins in the implicit outer scope).
2842 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
2843 if (earlier
== NULL
||
2844 (state
->current_function
!= NULL
&&
2845 !state
->symbols
->name_declared_this_scope(var
->name
))) {
2850 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2852 * "It is legal to declare an array without a size and then
2853 * later re-declare the same name as an array of the same
2854 * type and specify a size."
2856 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
2857 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
2858 /* FINISHME: This doesn't match the qualifiers on the two
2859 * FINISHME: declarations. It's not 100% clear whether this is
2860 * FINISHME: required or not.
2863 const unsigned size
= unsigned(var
->type
->array_size());
2864 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
2865 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
2866 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
2868 earlier
->data
.max_array_access
);
2871 earlier
->type
= var
->type
;
2874 } else if ((state
->ARB_fragment_coord_conventions_enable
||
2875 state
->is_version(150, 0))
2876 && strcmp(var
->name
, "gl_FragCoord") == 0
2877 && earlier
->type
== var
->type
2878 && earlier
->data
.mode
== var
->data
.mode
) {
2879 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
2882 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
2883 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
2885 /* According to section 4.3.7 of the GLSL 1.30 spec,
2886 * the following built-in varaibles can be redeclared with an
2887 * interpolation qualifier:
2890 * * gl_FrontSecondaryColor
2891 * * gl_BackSecondaryColor
2893 * * gl_SecondaryColor
2895 } else if (state
->is_version(130, 0)
2896 && (strcmp(var
->name
, "gl_FrontColor") == 0
2897 || strcmp(var
->name
, "gl_BackColor") == 0
2898 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
2899 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
2900 || strcmp(var
->name
, "gl_Color") == 0
2901 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
2902 && earlier
->type
== var
->type
2903 && earlier
->data
.mode
== var
->data
.mode
) {
2904 earlier
->data
.interpolation
= var
->data
.interpolation
;
2906 /* Layout qualifiers for gl_FragDepth. */
2907 } else if ((state
->AMD_conservative_depth_enable
||
2908 state
->ARB_conservative_depth_enable
)
2909 && strcmp(var
->name
, "gl_FragDepth") == 0
2910 && earlier
->type
== var
->type
2911 && earlier
->data
.mode
== var
->data
.mode
) {
2913 /** From the AMD_conservative_depth spec:
2914 * Within any shader, the first redeclarations of gl_FragDepth
2915 * must appear before any use of gl_FragDepth.
2917 if (earlier
->data
.used
) {
2918 _mesa_glsl_error(&loc
, state
,
2919 "the first redeclaration of gl_FragDepth "
2920 "must appear before any use of gl_FragDepth");
2923 /* Prevent inconsistent redeclaration of depth layout qualifier. */
2924 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
2925 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
2926 _mesa_glsl_error(&loc
, state
,
2927 "gl_FragDepth: depth layout is declared here "
2928 "as '%s, but it was previously declared as "
2930 depth_layout_string(var
->data
.depth_layout
),
2931 depth_layout_string(earlier
->data
.depth_layout
));
2934 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
2936 } else if (allow_all_redeclarations
) {
2937 if (earlier
->data
.mode
!= var
->data
.mode
) {
2938 _mesa_glsl_error(&loc
, state
,
2939 "redeclaration of `%s' with incorrect qualifiers",
2941 } else if (earlier
->type
!= var
->type
) {
2942 _mesa_glsl_error(&loc
, state
,
2943 "redeclaration of `%s' has incorrect type",
2947 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
2954 * Generate the IR for an initializer in a variable declaration
2957 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
2958 ast_fully_specified_type
*type
,
2959 exec_list
*initializer_instructions
,
2960 struct _mesa_glsl_parse_state
*state
)
2962 ir_rvalue
*result
= NULL
;
2964 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
2966 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
2968 * "All uniform variables are read-only and are initialized either
2969 * directly by an application via API commands, or indirectly by
2972 if (var
->data
.mode
== ir_var_uniform
) {
2973 state
->check_version(120, 0, &initializer_loc
,
2974 "cannot initialize uniforms");
2977 /* From section 4.1.7 of the GLSL 4.40 spec:
2979 * "Opaque variables [...] are initialized only through the
2980 * OpenGL API; they cannot be declared with an initializer in a
2983 if (var
->type
->contains_opaque()) {
2984 _mesa_glsl_error(& initializer_loc
, state
,
2985 "cannot initialize opaque variable");
2988 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
2989 _mesa_glsl_error(& initializer_loc
, state
,
2990 "cannot initialize %s shader input / %s",
2991 _mesa_shader_stage_to_string(state
->stage
),
2992 (state
->stage
== MESA_SHADER_VERTEX
)
2993 ? "attribute" : "varying");
2996 /* If the initializer is an ast_aggregate_initializer, recursively store
2997 * type information from the LHS into it, so that its hir() function can do
3000 if (decl
->initializer
->oper
== ast_aggregate
)
3001 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3003 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3004 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3006 /* Calculate the constant value if this is a const or uniform
3009 if (type
->qualifier
.flags
.q
.constant
3010 || type
->qualifier
.flags
.q
.uniform
) {
3011 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3012 var
->type
, rhs
, true);
3013 if (new_rhs
!= NULL
) {
3016 ir_constant
*constant_value
= rhs
->constant_expression_value();
3017 if (!constant_value
) {
3018 /* If ARB_shading_language_420pack is enabled, initializers of
3019 * const-qualified local variables do not have to be constant
3020 * expressions. Const-qualified global variables must still be
3021 * initialized with constant expressions.
3023 if (!state
->ARB_shading_language_420pack_enable
3024 || state
->current_function
== NULL
) {
3025 _mesa_glsl_error(& initializer_loc
, state
,
3026 "initializer of %s variable `%s' must be a "
3027 "constant expression",
3028 (type
->qualifier
.flags
.q
.constant
)
3029 ? "const" : "uniform",
3031 if (var
->type
->is_numeric()) {
3032 /* Reduce cascading errors. */
3033 var
->constant_value
= ir_constant::zero(state
, var
->type
);
3037 rhs
= constant_value
;
3038 var
->constant_value
= constant_value
;
3041 if (var
->type
->is_numeric()) {
3042 /* Reduce cascading errors. */
3043 var
->constant_value
= ir_constant::zero(state
, var
->type
);
3048 if (rhs
&& !rhs
->type
->is_error()) {
3049 bool temp
= var
->data
.read_only
;
3050 if (type
->qualifier
.flags
.q
.constant
)
3051 var
->data
.read_only
= false;
3053 /* Never emit code to initialize a uniform.
3055 const glsl_type
*initializer_type
;
3056 if (!type
->qualifier
.flags
.q
.uniform
) {
3057 do_assignment(initializer_instructions
, state
,
3062 type
->get_location());
3063 initializer_type
= result
->type
;
3065 initializer_type
= rhs
->type
;
3067 var
->constant_initializer
= rhs
->constant_expression_value();
3068 var
->data
.has_initializer
= true;
3070 /* If the declared variable is an unsized array, it must inherrit
3071 * its full type from the initializer. A declaration such as
3073 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3077 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3079 * The assignment generated in the if-statement (below) will also
3080 * automatically handle this case for non-uniforms.
3082 * If the declared variable is not an array, the types must
3083 * already match exactly. As a result, the type assignment
3084 * here can be done unconditionally. For non-uniforms the call
3085 * to do_assignment can change the type of the initializer (via
3086 * the implicit conversion rules). For uniforms the initializer
3087 * must be a constant expression, and the type of that expression
3088 * was validated above.
3090 var
->type
= initializer_type
;
3092 var
->data
.read_only
= temp
;
3100 * Do additional processing necessary for geometry shader input declarations
3101 * (this covers both interface blocks arrays and bare input variables).
3104 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3105 YYLTYPE loc
, ir_variable
*var
)
3107 unsigned num_vertices
= 0;
3108 if (state
->gs_input_prim_type_specified
) {
3109 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
3112 /* Geometry shader input variables must be arrays. Caller should have
3113 * reported an error for this.
3115 if (!var
->type
->is_array()) {
3116 assert(state
->error
);
3118 /* To avoid cascading failures, short circuit the checks below. */
3122 if (var
->type
->is_unsized_array()) {
3123 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3125 * All geometry shader input unsized array declarations will be
3126 * sized by an earlier input layout qualifier, when present, as per
3127 * the following table.
3129 * Followed by a table mapping each allowed input layout qualifier to
3130 * the corresponding input length.
3132 if (num_vertices
!= 0)
3133 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3136 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3137 * includes the following examples of compile-time errors:
3139 * // code sequence within one shader...
3140 * in vec4 Color1[]; // size unknown
3141 * ...Color1.length()...// illegal, length() unknown
3142 * in vec4 Color2[2]; // size is 2
3143 * ...Color1.length()...// illegal, Color1 still has no size
3144 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3145 * layout(lines) in; // legal, input size is 2, matching
3146 * in vec4 Color4[3]; // illegal, contradicts layout
3149 * To detect the case illustrated by Color3, we verify that the size of
3150 * an explicitly-sized array matches the size of any previously declared
3151 * explicitly-sized array. To detect the case illustrated by Color4, we
3152 * verify that the size of an explicitly-sized array is consistent with
3153 * any previously declared input layout.
3155 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3156 _mesa_glsl_error(&loc
, state
,
3157 "geometry shader input size contradicts previously"
3158 " declared layout (size is %u, but layout requires a"
3159 " size of %u)", var
->type
->length
, num_vertices
);
3160 } else if (state
->gs_input_size
!= 0 &&
3161 var
->type
->length
!= state
->gs_input_size
) {
3162 _mesa_glsl_error(&loc
, state
,
3163 "geometry shader input sizes are "
3164 "inconsistent (size is %u, but a previous "
3165 "declaration has size %u)",
3166 var
->type
->length
, state
->gs_input_size
);
3168 state
->gs_input_size
= var
->type
->length
;
3175 validate_identifier(const char *identifier
, YYLTYPE loc
,
3176 struct _mesa_glsl_parse_state
*state
)
3178 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3180 * "Identifiers starting with "gl_" are reserved for use by
3181 * OpenGL, and may not be declared in a shader as either a
3182 * variable or a function."
3184 if (is_gl_identifier(identifier
)) {
3185 _mesa_glsl_error(&loc
, state
,
3186 "identifier `%s' uses reserved `gl_' prefix",
3188 } else if (strstr(identifier
, "__")) {
3189 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3192 * "In addition, all identifiers containing two
3193 * consecutive underscores (__) are reserved as
3194 * possible future keywords."
3196 * The intention is that names containing __ are reserved for internal
3197 * use by the implementation, and names prefixed with GL_ are reserved
3198 * for use by Khronos. Names simply containing __ are dangerous to use,
3199 * but should be allowed.
3201 * A future version of the GLSL specification will clarify this.
3203 _mesa_glsl_warning(&loc
, state
,
3204 "identifier `%s' uses reserved `__' string",
3210 precision_qualifier_allowed(const glsl_type
*type
)
3212 /* Precision qualifiers apply to floating point, integer and sampler
3215 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3216 * "Any floating point or any integer declaration can have the type
3217 * preceded by one of these precision qualifiers [...] Literal
3218 * constants do not have precision qualifiers. Neither do Boolean
3221 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3224 * "Precision qualifiers are added for code portability with OpenGL
3225 * ES, not for functionality. They have the same syntax as in OpenGL
3228 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3230 * "uniform lowp sampler2D sampler;
3233 * lowp vec4 col = texture2D (sampler, coord);
3234 * // texture2D returns lowp"
3236 * From this, we infer that GLSL 1.30 (and later) should allow precision
3237 * qualifiers on sampler types just like float and integer types.
3239 return type
->is_float()
3240 || type
->is_integer()
3241 || type
->is_record()
3242 || type
->is_sampler();
3246 ast_declarator_list::hir(exec_list
*instructions
,
3247 struct _mesa_glsl_parse_state
*state
)
3250 const struct glsl_type
*decl_type
;
3251 const char *type_name
= NULL
;
3252 ir_rvalue
*result
= NULL
;
3253 YYLTYPE loc
= this->get_location();
3255 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
3257 * "To ensure that a particular output variable is invariant, it is
3258 * necessary to use the invariant qualifier. It can either be used to
3259 * qualify a previously declared variable as being invariant
3261 * invariant gl_Position; // make existing gl_Position be invariant"
3263 * In these cases the parser will set the 'invariant' flag in the declarator
3264 * list, and the type will be NULL.
3266 if (this->invariant
) {
3267 assert(this->type
== NULL
);
3269 if (state
->current_function
!= NULL
) {
3270 _mesa_glsl_error(& loc
, state
,
3271 "all uses of `invariant' keyword must be at global "
3275 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3276 assert(decl
->array_specifier
== NULL
);
3277 assert(decl
->initializer
== NULL
);
3279 ir_variable
*const earlier
=
3280 state
->symbols
->get_variable(decl
->identifier
);
3281 if (earlier
== NULL
) {
3282 _mesa_glsl_error(& loc
, state
,
3283 "undeclared variable `%s' cannot be marked "
3284 "invariant", decl
->identifier
);
3285 } else if (!is_varying_var(earlier
, state
->stage
)) {
3286 _mesa_glsl_error(&loc
, state
,
3287 "`%s' cannot be marked invariant; interfaces between "
3288 "shader stages only.", decl
->identifier
);
3289 } else if (earlier
->data
.used
) {
3290 _mesa_glsl_error(& loc
, state
,
3291 "variable `%s' may not be redeclared "
3292 "`invariant' after being used",
3295 earlier
->data
.invariant
= true;
3299 /* Invariant redeclarations do not have r-values.
3304 if (this->precise
) {
3305 assert(this->type
== NULL
);
3307 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3308 assert(decl
->array_specifier
== NULL
);
3309 assert(decl
->initializer
== NULL
);
3311 ir_variable
*const earlier
=
3312 state
->symbols
->get_variable(decl
->identifier
);
3313 if (earlier
== NULL
) {
3314 _mesa_glsl_error(& loc
, state
,
3315 "undeclared variable `%s' cannot be marked "
3316 "precise", decl
->identifier
);
3317 } else if (state
->current_function
!= NULL
&&
3318 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
3319 /* Note: we have to check if we're in a function, since
3320 * builtins are treated as having come from another scope.
3322 _mesa_glsl_error(& loc
, state
,
3323 "variable `%s' from an outer scope may not be "
3324 "redeclared `precise' in this scope",
3326 } else if (earlier
->data
.used
) {
3327 _mesa_glsl_error(& loc
, state
,
3328 "variable `%s' may not be redeclared "
3329 "`precise' after being used",
3332 earlier
->data
.precise
= true;
3336 /* Precise redeclarations do not have r-values either. */
3340 assert(this->type
!= NULL
);
3341 assert(!this->invariant
);
3342 assert(!this->precise
);
3344 /* The type specifier may contain a structure definition. Process that
3345 * before any of the variable declarations.
3347 (void) this->type
->specifier
->hir(instructions
, state
);
3349 decl_type
= this->type
->glsl_type(& type_name
, state
);
3351 /* An offset-qualified atomic counter declaration sets the default
3352 * offset for the next declaration within the same atomic counter
3355 if (decl_type
&& decl_type
->contains_atomic()) {
3356 if (type
->qualifier
.flags
.q
.explicit_binding
&&
3357 type
->qualifier
.flags
.q
.explicit_offset
)
3358 state
->atomic_counter_offsets
[type
->qualifier
.binding
] =
3359 type
->qualifier
.offset
;
3362 if (this->declarations
.is_empty()) {
3363 /* If there is no structure involved in the program text, there are two
3364 * possible scenarios:
3366 * - The program text contained something like 'vec4;'. This is an
3367 * empty declaration. It is valid but weird. Emit a warning.
3369 * - The program text contained something like 'S;' and 'S' is not the
3370 * name of a known structure type. This is both invalid and weird.
3373 * - The program text contained something like 'mediump float;'
3374 * when the programmer probably meant 'precision mediump
3375 * float;' Emit a warning with a description of what they
3376 * probably meant to do.
3378 * Note that if decl_type is NULL and there is a structure involved,
3379 * there must have been some sort of error with the structure. In this
3380 * case we assume that an error was already generated on this line of
3381 * code for the structure. There is no need to generate an additional,
3384 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
3387 if (decl_type
== NULL
) {
3388 _mesa_glsl_error(&loc
, state
,
3389 "invalid type `%s' in empty declaration",
3391 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
3392 /* Empty atomic counter declarations are allowed and useful
3393 * to set the default offset qualifier.
3396 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3397 if (this->type
->specifier
->structure
!= NULL
) {
3398 _mesa_glsl_error(&loc
, state
,
3399 "precision qualifiers can't be applied "
3402 static const char *const precision_names
[] = {
3409 _mesa_glsl_warning(&loc
, state
,
3410 "empty declaration with precision qualifier, "
3411 "to set the default precision, use "
3412 "`precision %s %s;'",
3413 precision_names
[this->type
->qualifier
.precision
],
3416 } else if (this->type
->specifier
->structure
== NULL
) {
3417 _mesa_glsl_warning(&loc
, state
, "empty declaration");
3421 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3422 const struct glsl_type
*var_type
;
3425 /* FINISHME: Emit a warning if a variable declaration shadows a
3426 * FINISHME: declaration at a higher scope.
3429 if ((decl_type
== NULL
) || decl_type
->is_void()) {
3430 if (type_name
!= NULL
) {
3431 _mesa_glsl_error(& loc
, state
,
3432 "invalid type `%s' in declaration of `%s'",
3433 type_name
, decl
->identifier
);
3435 _mesa_glsl_error(& loc
, state
,
3436 "invalid type in declaration of `%s'",
3442 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
3445 var
= new(ctx
) ir_variable(var_type
, decl
->identifier
, ir_var_auto
);
3447 /* The 'varying in' and 'varying out' qualifiers can only be used with
3448 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
3451 if (this->type
->qualifier
.flags
.q
.varying
) {
3452 if (this->type
->qualifier
.flags
.q
.in
) {
3453 _mesa_glsl_error(& loc
, state
,
3454 "`varying in' qualifier in declaration of "
3455 "`%s' only valid for geometry shaders using "
3456 "ARB_geometry_shader4 or EXT_geometry_shader4",
3458 } else if (this->type
->qualifier
.flags
.q
.out
) {
3459 _mesa_glsl_error(& loc
, state
,
3460 "`varying out' qualifier in declaration of "
3461 "`%s' only valid for geometry shaders using "
3462 "ARB_geometry_shader4 or EXT_geometry_shader4",
3467 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
3469 * "Global variables can only use the qualifiers const,
3470 * attribute, uniform, or varying. Only one may be
3473 * Local variables can only use the qualifier const."
3475 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
3476 * any extension that adds the 'layout' keyword.
3478 if (!state
->is_version(130, 300)
3479 && !state
->has_explicit_attrib_location()
3480 && !state
->has_separate_shader_objects()
3481 && !state
->ARB_fragment_coord_conventions_enable
) {
3482 if (this->type
->qualifier
.flags
.q
.out
) {
3483 _mesa_glsl_error(& loc
, state
,
3484 "`out' qualifier in declaration of `%s' "
3485 "only valid for function parameters in %s",
3486 decl
->identifier
, state
->get_version_string());
3488 if (this->type
->qualifier
.flags
.q
.in
) {
3489 _mesa_glsl_error(& loc
, state
,
3490 "`in' qualifier in declaration of `%s' "
3491 "only valid for function parameters in %s",
3492 decl
->identifier
, state
->get_version_string());
3494 /* FINISHME: Test for other invalid qualifiers. */
3497 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
3500 if (this->type
->qualifier
.flags
.q
.invariant
) {
3501 if (!is_varying_var(var
, state
->stage
)) {
3502 _mesa_glsl_error(&loc
, state
,
3503 "`%s' cannot be marked invariant; interfaces between "
3504 "shader stages only", var
->name
);
3508 if (state
->current_function
!= NULL
) {
3509 const char *mode
= NULL
;
3510 const char *extra
= "";
3512 /* There is no need to check for 'inout' here because the parser will
3513 * only allow that in function parameter lists.
3515 if (this->type
->qualifier
.flags
.q
.attribute
) {
3517 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
3519 } else if (this->type
->qualifier
.flags
.q
.varying
) {
3521 } else if (this->type
->qualifier
.flags
.q
.in
) {
3523 extra
= " or in function parameter list";
3524 } else if (this->type
->qualifier
.flags
.q
.out
) {
3526 extra
= " or in function parameter list";
3530 _mesa_glsl_error(& loc
, state
,
3531 "%s variable `%s' must be declared at "
3533 mode
, var
->name
, extra
);
3535 } else if (var
->data
.mode
== ir_var_shader_in
) {
3536 var
->data
.read_only
= true;
3538 if (state
->stage
== MESA_SHADER_VERTEX
) {
3539 bool error_emitted
= false;
3541 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
3543 * "Vertex shader inputs can only be float, floating-point
3544 * vectors, matrices, signed and unsigned integers and integer
3545 * vectors. Vertex shader inputs can also form arrays of these
3546 * types, but not structures."
3548 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
3550 * "Vertex shader inputs can only be float, floating-point
3551 * vectors, matrices, signed and unsigned integers and integer
3552 * vectors. They cannot be arrays or structures."
3554 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
3556 * "The attribute qualifier can be used only with float,
3557 * floating-point vectors, and matrices. Attribute variables
3558 * cannot be declared as arrays or structures."
3560 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
3562 * "Vertex shader inputs can only be float, floating-point
3563 * vectors, matrices, signed and unsigned integers and integer
3564 * vectors. Vertex shader inputs cannot be arrays or
3567 const glsl_type
*check_type
= var
->type
->without_array();
3569 switch (check_type
->base_type
) {
3570 case GLSL_TYPE_FLOAT
:
3572 case GLSL_TYPE_UINT
:
3574 if (state
->is_version(120, 300))
3576 case GLSL_TYPE_DOUBLE
:
3577 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
3581 _mesa_glsl_error(& loc
, state
,
3582 "vertex shader input / attribute cannot have "
3584 var
->type
->is_array() ? "array of " : "",
3586 error_emitted
= true;
3589 if (!error_emitted
&& var
->type
->is_array() &&
3590 !state
->check_version(150, 0, &loc
,
3591 "vertex shader input / attribute "
3592 "cannot have array type")) {
3593 error_emitted
= true;
3595 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
3596 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3598 * Geometry shader input variables get the per-vertex values
3599 * written out by vertex shader output variables of the same
3600 * names. Since a geometry shader operates on a set of
3601 * vertices, each input varying variable (or input block, see
3602 * interface blocks below) needs to be declared as an array.
3604 if (!var
->type
->is_array()) {
3605 _mesa_glsl_error(&loc
, state
,
3606 "geometry shader inputs must be arrays");
3609 handle_geometry_shader_input_decl(state
, loc
, var
);
3610 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
3611 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
3613 * It is a compile-time error to declare a fragment shader
3614 * input with, or that contains, any of the following types:
3618 * * An array of arrays
3619 * * An array of structures
3620 * * A structure containing an array
3621 * * A structure containing a structure
3623 if (state
->es_shader
) {
3624 const glsl_type
*check_type
= var
->type
->without_array();
3625 if (check_type
->is_boolean() ||
3626 check_type
->contains_opaque()) {
3627 _mesa_glsl_error(&loc
, state
,
3628 "fragment shader input cannot have type %s",
3631 if (var
->type
->is_array() &&
3632 var
->type
->fields
.array
->is_array()) {
3633 _mesa_glsl_error(&loc
, state
,
3635 "cannot have an array of arrays",
3636 _mesa_shader_stage_to_string(state
->stage
));
3638 if (var
->type
->is_array() &&
3639 var
->type
->fields
.array
->is_record()) {
3640 _mesa_glsl_error(&loc
, state
,
3641 "fragment shader input "
3642 "cannot have an array of structs");
3644 if (var
->type
->is_record()) {
3645 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
3646 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
3647 var
->type
->fields
.structure
[i
].type
->is_record())
3648 _mesa_glsl_error(&loc
, state
,
3649 "fragement shader input cannot have "
3650 "a struct that contains an "
3656 } else if (var
->data
.mode
== ir_var_shader_out
) {
3657 const glsl_type
*check_type
= var
->type
->without_array();
3659 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
3661 * It is a compile-time error to declare a vertex, tessellation
3662 * evaluation, tessellation control, or geometry shader output
3663 * that contains any of the following:
3665 * * A Boolean type (bool, bvec2 ...)
3668 if (check_type
->is_boolean() || check_type
->contains_opaque())
3669 _mesa_glsl_error(&loc
, state
,
3670 "%s shader output cannot have type %s",
3671 _mesa_shader_stage_to_string(state
->stage
),
3674 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
3676 * It is a compile-time error to declare a fragment shader output
3677 * that contains any of the following:
3679 * * A Boolean type (bool, bvec2 ...)
3680 * * A double-precision scalar or vector (double, dvec2 ...)
3685 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
3686 if (check_type
->is_record() || check_type
->is_matrix())
3687 _mesa_glsl_error(&loc
, state
,
3688 "fragment shader output "
3689 "cannot have struct or array type");
3690 switch (check_type
->base_type
) {
3691 case GLSL_TYPE_UINT
:
3693 case GLSL_TYPE_FLOAT
:
3696 _mesa_glsl_error(&loc
, state
,
3697 "fragment shader output cannot have "
3698 "type %s", check_type
->name
);
3702 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
3704 * It is a compile-time error to declare a vertex shader output
3705 * with, or that contains, any of the following types:
3709 * * An array of arrays
3710 * * An array of structures
3711 * * A structure containing an array
3712 * * A structure containing a structure
3714 * It is a compile-time error to declare a fragment shader output
3715 * with, or that contains, any of the following types:
3721 * * An array of array
3723 if (state
->es_shader
) {
3724 if (var
->type
->is_array() &&
3725 var
->type
->fields
.array
->is_array()) {
3726 _mesa_glsl_error(&loc
, state
,
3728 "cannot have an array of arrays",
3729 _mesa_shader_stage_to_string(state
->stage
));
3731 if (state
->stage
== MESA_SHADER_VERTEX
) {
3732 if (var
->type
->is_array() &&
3733 var
->type
->fields
.array
->is_record()) {
3734 _mesa_glsl_error(&loc
, state
,
3735 "vertex shader output "
3736 "cannot have an array of structs");
3738 if (var
->type
->is_record()) {
3739 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
3740 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
3741 var
->type
->fields
.structure
[i
].type
->is_record())
3742 _mesa_glsl_error(&loc
, state
,
3743 "vertex shader output cannot have a "
3744 "struct that contains an "
3752 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
3753 * so must integer vertex outputs.
3755 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
3756 * "Fragment shader inputs that are signed or unsigned integers or
3757 * integer vectors must be qualified with the interpolation qualifier
3760 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3761 * "Fragment shader inputs that are, or contain, signed or unsigned
3762 * integers or integer vectors must be qualified with the
3763 * interpolation qualifier flat."
3765 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3766 * "Vertex shader outputs that are, or contain, signed or unsigned
3767 * integers or integer vectors must be qualified with the
3768 * interpolation qualifier flat."
3770 * Note that prior to GLSL 1.50, this requirement applied to vertex
3771 * outputs rather than fragment inputs. That creates problems in the
3772 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3773 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3774 * apply the restriction to both vertex outputs and fragment inputs.
3776 * Note also that the desktop GLSL specs are missing the text "or
3777 * contain"; this is presumably an oversight, since there is no
3778 * reasonable way to interpolate a fragment shader input that contains
3781 if (state
->is_version(130, 300) &&
3782 var
->type
->contains_integer() &&
3783 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
3784 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
3785 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
3786 && state
->es_shader
))) {
3787 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
3788 "vertex output" : "fragment input";
3789 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
3790 "an integer, then it must be qualified with 'flat'",
3794 /* Double fragment inputs must be qualified with 'flat'. */
3795 if (var
->type
->contains_double() &&
3796 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
3797 state
->stage
== MESA_SHADER_FRAGMENT
&&
3798 var
->data
.mode
== ir_var_shader_in
) {
3799 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
3800 "a double, then it must be qualified with 'flat'",
3804 /* Interpolation qualifiers cannot be applied to 'centroid' and
3805 * 'centroid varying'.
3807 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3808 * "interpolation qualifiers may only precede the qualifiers in,
3809 * centroid in, out, or centroid out in a declaration. They do not apply
3810 * to the deprecated storage qualifiers varying or centroid varying."
3812 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3814 if (state
->is_version(130, 0)
3815 && this->type
->qualifier
.has_interpolation()
3816 && this->type
->qualifier
.flags
.q
.varying
) {
3818 const char *i
= this->type
->qualifier
.interpolation_string();
3821 if (this->type
->qualifier
.flags
.q
.centroid
)
3822 s
= "centroid varying";
3826 _mesa_glsl_error(&loc
, state
,
3827 "qualifier '%s' cannot be applied to the "
3828 "deprecated storage qualifier '%s'", i
, s
);
3832 /* Interpolation qualifiers can only apply to vertex shader outputs and
3833 * fragment shader inputs.
3835 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
3836 * "Outputs from a vertex shader (out) and inputs to a fragment
3837 * shader (in) can be further qualified with one or more of these
3838 * interpolation qualifiers"
3840 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
3841 * "These interpolation qualifiers may only precede the qualifiers
3842 * in, centroid in, out, or centroid out in a declaration. They do
3843 * not apply to inputs into a vertex shader or outputs from a
3846 if (state
->is_version(130, 300)
3847 && this->type
->qualifier
.has_interpolation()) {
3849 const char *i
= this->type
->qualifier
.interpolation_string();
3852 switch (state
->stage
) {
3853 case MESA_SHADER_VERTEX
:
3854 if (this->type
->qualifier
.flags
.q
.in
) {
3855 _mesa_glsl_error(&loc
, state
,
3856 "qualifier '%s' cannot be applied to vertex "
3857 "shader inputs", i
);
3860 case MESA_SHADER_FRAGMENT
:
3861 if (this->type
->qualifier
.flags
.q
.out
) {
3862 _mesa_glsl_error(&loc
, state
,
3863 "qualifier '%s' cannot be applied to fragment "
3864 "shader outputs", i
);
3873 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
3875 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3876 state
->check_precision_qualifiers_allowed(&loc
);
3880 /* If a precision qualifier is allowed on a type, it is allowed on
3881 * an array of that type.
3883 if (!(this->type
->qualifier
.precision
== ast_precision_none
3884 || precision_qualifier_allowed(var
->type
)
3885 || (var
->type
->is_array()
3886 && precision_qualifier_allowed(var
->type
->fields
.array
)))) {
3888 _mesa_glsl_error(&loc
, state
,
3889 "precision qualifiers apply only to floating point"
3890 ", integer and sampler types");
3893 /* From section 4.1.7 of the GLSL 4.40 spec:
3895 * "[Opaque types] can only be declared as function
3896 * parameters or uniform-qualified variables."
3898 if (var_type
->contains_opaque() &&
3899 !this->type
->qualifier
.flags
.q
.uniform
) {
3900 _mesa_glsl_error(&loc
, state
,
3901 "opaque variables must be declared uniform");
3904 /* Process the initializer and add its instructions to a temporary
3905 * list. This list will be added to the instruction stream (below) after
3906 * the declaration is added. This is done because in some cases (such as
3907 * redeclarations) the declaration may not actually be added to the
3908 * instruction stream.
3910 exec_list initializer_instructions
;
3912 /* Examine var name here since var may get deleted in the next call */
3913 bool var_is_gl_id
= is_gl_identifier(var
->name
);
3915 ir_variable
*earlier
=
3916 get_variable_being_redeclared(var
, decl
->get_location(), state
,
3917 false /* allow_all_redeclarations */);
3918 if (earlier
!= NULL
) {
3920 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
3921 _mesa_glsl_error(&loc
, state
,
3922 "`%s' has already been redeclared using "
3923 "gl_PerVertex", earlier
->name
);
3925 earlier
->data
.how_declared
= ir_var_declared_normally
;
3928 if (decl
->initializer
!= NULL
) {
3929 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
3931 &initializer_instructions
, state
);
3934 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
3936 * "It is an error to write to a const variable outside of
3937 * its declaration, so they must be initialized when
3940 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
3941 _mesa_glsl_error(& loc
, state
,
3942 "const declaration of `%s' must be initialized",
3946 /* GLSL ES 3.10 removes the restriction on unsized arrays.
3948 * Section 4.1.9 (Arrays) of the GLSL ES 3.10 spec says:
3950 * "Variables of the same type can be aggregated into arrays by
3951 * declaring a name followed by brackets ([ ]) enclosing an
3954 if (state
->es_shader
&& state
->language_version
< 310) {
3955 const glsl_type
*const t
= (earlier
== NULL
)
3956 ? var
->type
: earlier
->type
;
3958 if (t
->is_unsized_array())
3959 /* Section 10.17 of the GLSL ES 1.00 specification states that
3960 * unsized array declarations have been removed from the language.
3961 * Arrays that are sized using an initializer are still explicitly
3962 * sized. However, GLSL ES 1.00 does not allow array
3963 * initializers. That is only allowed in GLSL ES 3.00.
3965 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
3967 * "An array type can also be formed without specifying a size
3968 * if the definition includes an initializer:
3970 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
3971 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
3976 _mesa_glsl_error(& loc
, state
,
3977 "unsized array declarations are not allowed in "
3981 /* If the declaration is not a redeclaration, there are a few additional
3982 * semantic checks that must be applied. In addition, variable that was
3983 * created for the declaration should be added to the IR stream.
3985 if (earlier
== NULL
) {
3986 validate_identifier(decl
->identifier
, loc
, state
);
3988 /* Add the variable to the symbol table. Note that the initializer's
3989 * IR was already processed earlier (though it hasn't been emitted
3990 * yet), without the variable in scope.
3992 * This differs from most C-like languages, but it follows the GLSL
3993 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
3996 * "Within a declaration, the scope of a name starts immediately
3997 * after the initializer if present or immediately after the name
3998 * being declared if not."
4000 if (!state
->symbols
->add_variable(var
)) {
4001 YYLTYPE loc
= this->get_location();
4002 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4003 "current scope", decl
->identifier
);
4007 /* Push the variable declaration to the top. It means that all the
4008 * variable declarations will appear in a funny last-to-first order,
4009 * but otherwise we run into trouble if a function is prototyped, a
4010 * global var is decled, then the function is defined with usage of
4011 * the global var. See glslparsertest's CorrectModule.frag.
4013 instructions
->push_head(var
);
4016 instructions
->append_list(&initializer_instructions
);
4020 /* Generally, variable declarations do not have r-values. However,
4021 * one is used for the declaration in
4023 * while (bool b = some_condition()) {
4027 * so we return the rvalue from the last seen declaration here.
4034 ast_parameter_declarator::hir(exec_list
*instructions
,
4035 struct _mesa_glsl_parse_state
*state
)
4038 const struct glsl_type
*type
;
4039 const char *name
= NULL
;
4040 YYLTYPE loc
= this->get_location();
4042 type
= this->type
->glsl_type(& name
, state
);
4046 _mesa_glsl_error(& loc
, state
,
4047 "invalid type `%s' in declaration of `%s'",
4048 name
, this->identifier
);
4050 _mesa_glsl_error(& loc
, state
,
4051 "invalid type in declaration of `%s'",
4055 type
= glsl_type::error_type
;
4058 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4060 * "Functions that accept no input arguments need not use void in the
4061 * argument list because prototypes (or definitions) are required and
4062 * therefore there is no ambiguity when an empty argument list "( )" is
4063 * declared. The idiom "(void)" as a parameter list is provided for
4066 * Placing this check here prevents a void parameter being set up
4067 * for a function, which avoids tripping up checks for main taking
4068 * parameters and lookups of an unnamed symbol.
4070 if (type
->is_void()) {
4071 if (this->identifier
!= NULL
)
4072 _mesa_glsl_error(& loc
, state
,
4073 "named parameter cannot have type `void'");
4079 if (formal_parameter
&& (this->identifier
== NULL
)) {
4080 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4084 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4085 * call already handled the "vec4[..] foo" case.
4087 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4089 if (!type
->is_error() && type
->is_unsized_array()) {
4090 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4092 type
= glsl_type::error_type
;
4096 ir_variable
*var
= new(ctx
)
4097 ir_variable(type
, this->identifier
, ir_var_function_in
);
4099 /* Apply any specified qualifiers to the parameter declaration. Note that
4100 * for function parameters the default mode is 'in'.
4102 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
4105 /* From section 4.1.7 of the GLSL 4.40 spec:
4107 * "Opaque variables cannot be treated as l-values; hence cannot
4108 * be used as out or inout function parameters, nor can they be
4111 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4112 && type
->contains_opaque()) {
4113 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
4114 "contain opaque variables");
4115 type
= glsl_type::error_type
;
4118 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
4120 * "When calling a function, expressions that do not evaluate to
4121 * l-values cannot be passed to parameters declared as out or inout."
4123 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
4125 * "Other binary or unary expressions, non-dereferenced arrays,
4126 * function names, swizzles with repeated fields, and constants
4127 * cannot be l-values."
4129 * So for GLSL 1.10, passing an array as an out or inout parameter is not
4130 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
4132 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4134 && !state
->check_version(120, 100, &loc
,
4135 "arrays cannot be out or inout parameters")) {
4136 type
= glsl_type::error_type
;
4139 instructions
->push_tail(var
);
4141 /* Parameter declarations do not have r-values.
4148 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
4150 exec_list
*ir_parameters
,
4151 _mesa_glsl_parse_state
*state
)
4153 ast_parameter_declarator
*void_param
= NULL
;
4156 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
4157 param
->formal_parameter
= formal
;
4158 param
->hir(ir_parameters
, state
);
4166 if ((void_param
!= NULL
) && (count
> 1)) {
4167 YYLTYPE loc
= void_param
->get_location();
4169 _mesa_glsl_error(& loc
, state
,
4170 "`void' parameter must be only parameter");
4176 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
4178 /* IR invariants disallow function declarations or definitions
4179 * nested within other function definitions. But there is no
4180 * requirement about the relative order of function declarations
4181 * and definitions with respect to one another. So simply insert
4182 * the new ir_function block at the end of the toplevel instruction
4185 state
->toplevel_ir
->push_tail(f
);
4190 ast_function::hir(exec_list
*instructions
,
4191 struct _mesa_glsl_parse_state
*state
)
4194 ir_function
*f
= NULL
;
4195 ir_function_signature
*sig
= NULL
;
4196 exec_list hir_parameters
;
4198 const char *const name
= identifier
;
4200 /* New functions are always added to the top-level IR instruction stream,
4201 * so this instruction list pointer is ignored. See also emit_function
4204 (void) instructions
;
4206 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
4208 * "Function declarations (prototypes) cannot occur inside of functions;
4209 * they must be at global scope, or for the built-in functions, outside
4210 * the global scope."
4212 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
4214 * "User defined functions may only be defined within the global scope."
4216 * Note that this language does not appear in GLSL 1.10.
4218 if ((state
->current_function
!= NULL
) &&
4219 state
->is_version(120, 100)) {
4220 YYLTYPE loc
= this->get_location();
4221 _mesa_glsl_error(&loc
, state
,
4222 "declaration of function `%s' not allowed within "
4223 "function body", name
);
4226 validate_identifier(name
, this->get_location(), state
);
4228 /* Convert the list of function parameters to HIR now so that they can be
4229 * used below to compare this function's signature with previously seen
4230 * signatures for functions with the same name.
4232 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
4234 & hir_parameters
, state
);
4236 const char *return_type_name
;
4237 const glsl_type
*return_type
=
4238 this->return_type
->glsl_type(& return_type_name
, state
);
4241 YYLTYPE loc
= this->get_location();
4242 _mesa_glsl_error(&loc
, state
,
4243 "function `%s' has undeclared return type `%s'",
4244 name
, return_type_name
);
4245 return_type
= glsl_type::error_type
;
4248 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
4249 * "No qualifier is allowed on the return type of a function."
4251 if (this->return_type
->has_qualifiers()) {
4252 YYLTYPE loc
= this->get_location();
4253 _mesa_glsl_error(& loc
, state
,
4254 "function `%s' return type has qualifiers", name
);
4257 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
4259 * "Arrays are allowed as arguments and as the return type. In both
4260 * cases, the array must be explicitly sized."
4262 if (return_type
->is_unsized_array()) {
4263 YYLTYPE loc
= this->get_location();
4264 _mesa_glsl_error(& loc
, state
,
4265 "function `%s' return type array must be explicitly "
4269 /* From section 4.1.7 of the GLSL 4.40 spec:
4271 * "[Opaque types] can only be declared as function parameters
4272 * or uniform-qualified variables."
4274 if (return_type
->contains_opaque()) {
4275 YYLTYPE loc
= this->get_location();
4276 _mesa_glsl_error(&loc
, state
,
4277 "function `%s' return type can't contain an opaque type",
4281 /* Create an ir_function if one doesn't already exist. */
4282 f
= state
->symbols
->get_function(name
);
4284 f
= new(ctx
) ir_function(name
);
4285 if (!state
->symbols
->add_function(f
)) {
4286 /* This function name shadows a non-function use of the same name. */
4287 YYLTYPE loc
= this->get_location();
4289 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
4290 "non-function", name
);
4294 emit_function(state
, f
);
4297 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
4299 * "A shader cannot redefine or overload built-in functions."
4301 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
4303 * "User code can overload the built-in functions but cannot redefine
4306 if (state
->es_shader
&& state
->language_version
>= 300) {
4307 /* Local shader has no exact candidates; check the built-ins. */
4308 _mesa_glsl_initialize_builtin_functions();
4309 if (_mesa_glsl_find_builtin_function_by_name(state
, name
)) {
4310 YYLTYPE loc
= this->get_location();
4311 _mesa_glsl_error(& loc
, state
,
4312 "A shader cannot redefine or overload built-in "
4313 "function `%s' in GLSL ES 3.00", name
);
4318 /* Verify that this function's signature either doesn't match a previously
4319 * seen signature for a function with the same name, or, if a match is found,
4320 * that the previously seen signature does not have an associated definition.
4322 if (state
->es_shader
|| f
->has_user_signature()) {
4323 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
4325 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
4326 if (badvar
!= NULL
) {
4327 YYLTYPE loc
= this->get_location();
4329 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
4330 "qualifiers don't match prototype", name
, badvar
);
4333 if (sig
->return_type
!= return_type
) {
4334 YYLTYPE loc
= this->get_location();
4336 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
4337 "match prototype", name
);
4340 if (sig
->is_defined
) {
4341 if (is_definition
) {
4342 YYLTYPE loc
= this->get_location();
4343 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
4345 /* We just encountered a prototype that exactly matches a
4346 * function that's already been defined. This is redundant,
4347 * and we should ignore it.
4355 /* Verify the return type of main() */
4356 if (strcmp(name
, "main") == 0) {
4357 if (! return_type
->is_void()) {
4358 YYLTYPE loc
= this->get_location();
4360 _mesa_glsl_error(& loc
, state
, "main() must return void");
4363 if (!hir_parameters
.is_empty()) {
4364 YYLTYPE loc
= this->get_location();
4366 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
4370 /* Finish storing the information about this new function in its signature.
4373 sig
= new(ctx
) ir_function_signature(return_type
);
4374 f
->add_signature(sig
);
4377 sig
->replace_parameters(&hir_parameters
);
4380 /* Function declarations (prototypes) do not have r-values.
4387 ast_function_definition::hir(exec_list
*instructions
,
4388 struct _mesa_glsl_parse_state
*state
)
4390 prototype
->is_definition
= true;
4391 prototype
->hir(instructions
, state
);
4393 ir_function_signature
*signature
= prototype
->signature
;
4394 if (signature
== NULL
)
4397 assert(state
->current_function
== NULL
);
4398 state
->current_function
= signature
;
4399 state
->found_return
= false;
4401 /* Duplicate parameters declared in the prototype as concrete variables.
4402 * Add these to the symbol table.
4404 state
->symbols
->push_scope();
4405 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
4406 assert(var
->as_variable() != NULL
);
4408 /* The only way a parameter would "exist" is if two parameters have
4411 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
4412 YYLTYPE loc
= this->get_location();
4414 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
4416 state
->symbols
->add_variable(var
);
4420 /* Convert the body of the function to HIR. */
4421 this->body
->hir(&signature
->body
, state
);
4422 signature
->is_defined
= true;
4424 state
->symbols
->pop_scope();
4426 assert(state
->current_function
== signature
);
4427 state
->current_function
= NULL
;
4429 if (!signature
->return_type
->is_void() && !state
->found_return
) {
4430 YYLTYPE loc
= this->get_location();
4431 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
4432 "%s, but no return statement",
4433 signature
->function_name(),
4434 signature
->return_type
->name
);
4437 /* Function definitions do not have r-values.
4444 ast_jump_statement::hir(exec_list
*instructions
,
4445 struct _mesa_glsl_parse_state
*state
)
4452 assert(state
->current_function
);
4454 if (opt_return_value
) {
4455 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
4457 /* The value of the return type can be NULL if the shader says
4458 * 'return foo();' and foo() is a function that returns void.
4460 * NOTE: The GLSL spec doesn't say that this is an error. The type
4461 * of the return value is void. If the return type of the function is
4462 * also void, then this should compile without error. Seriously.
4464 const glsl_type
*const ret_type
=
4465 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
4467 /* Implicit conversions are not allowed for return values prior to
4468 * ARB_shading_language_420pack.
4470 if (state
->current_function
->return_type
!= ret_type
) {
4471 YYLTYPE loc
= this->get_location();
4473 if (state
->ARB_shading_language_420pack_enable
) {
4474 if (!apply_implicit_conversion(state
->current_function
->return_type
,
4476 _mesa_glsl_error(& loc
, state
,
4477 "could not implicitly convert return value "
4478 "to %s, in function `%s'",
4479 state
->current_function
->return_type
->name
,
4480 state
->current_function
->function_name());
4483 _mesa_glsl_error(& loc
, state
,
4484 "`return' with wrong type %s, in function `%s' "
4487 state
->current_function
->function_name(),
4488 state
->current_function
->return_type
->name
);
4490 } else if (state
->current_function
->return_type
->base_type
==
4492 YYLTYPE loc
= this->get_location();
4494 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
4495 * specs add a clarification:
4497 * "A void function can only use return without a return argument, even if
4498 * the return argument has void type. Return statements only accept values:
4501 * void func2() { return func1(); } // illegal return statement"
4503 _mesa_glsl_error(& loc
, state
,
4504 "void functions can only use `return' without a "
4508 inst
= new(ctx
) ir_return(ret
);
4510 if (state
->current_function
->return_type
->base_type
!=
4512 YYLTYPE loc
= this->get_location();
4514 _mesa_glsl_error(& loc
, state
,
4515 "`return' with no value, in function %s returning "
4517 state
->current_function
->function_name());
4519 inst
= new(ctx
) ir_return
;
4522 state
->found_return
= true;
4523 instructions
->push_tail(inst
);
4528 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
4529 YYLTYPE loc
= this->get_location();
4531 _mesa_glsl_error(& loc
, state
,
4532 "`discard' may only appear in a fragment shader");
4534 instructions
->push_tail(new(ctx
) ir_discard
);
4539 if (mode
== ast_continue
&&
4540 state
->loop_nesting_ast
== NULL
) {
4541 YYLTYPE loc
= this->get_location();
4543 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
4544 } else if (mode
== ast_break
&&
4545 state
->loop_nesting_ast
== NULL
&&
4546 state
->switch_state
.switch_nesting_ast
== NULL
) {
4547 YYLTYPE loc
= this->get_location();
4549 _mesa_glsl_error(& loc
, state
,
4550 "break may only appear in a loop or a switch");
4552 /* For a loop, inline the for loop expression again, since we don't
4553 * know where near the end of the loop body the normal copy of it is
4554 * going to be placed. Same goes for the condition for a do-while
4557 if (state
->loop_nesting_ast
!= NULL
&&
4558 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
4559 if (state
->loop_nesting_ast
->rest_expression
) {
4560 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
4563 if (state
->loop_nesting_ast
->mode
==
4564 ast_iteration_statement::ast_do_while
) {
4565 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
4569 if (state
->switch_state
.is_switch_innermost
&&
4570 mode
== ast_continue
) {
4571 /* Set 'continue_inside' to true. */
4572 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
4573 ir_dereference_variable
*deref_continue_inside_var
=
4574 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
4575 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
4578 /* Break out from the switch, continue for the loop will
4579 * be called right after switch. */
4580 ir_loop_jump
*const jump
=
4581 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4582 instructions
->push_tail(jump
);
4584 } else if (state
->switch_state
.is_switch_innermost
&&
4585 mode
== ast_break
) {
4586 /* Force break out of switch by inserting a break. */
4587 ir_loop_jump
*const jump
=
4588 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4589 instructions
->push_tail(jump
);
4591 ir_loop_jump
*const jump
=
4592 new(ctx
) ir_loop_jump((mode
== ast_break
)
4593 ? ir_loop_jump::jump_break
4594 : ir_loop_jump::jump_continue
);
4595 instructions
->push_tail(jump
);
4602 /* Jump instructions do not have r-values.
4609 ast_selection_statement::hir(exec_list
*instructions
,
4610 struct _mesa_glsl_parse_state
*state
)
4614 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
4616 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
4618 * "Any expression whose type evaluates to a Boolean can be used as the
4619 * conditional expression bool-expression. Vector types are not accepted
4620 * as the expression to if."
4622 * The checks are separated so that higher quality diagnostics can be
4623 * generated for cases where both rules are violated.
4625 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
4626 YYLTYPE loc
= this->condition
->get_location();
4628 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
4632 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
4634 if (then_statement
!= NULL
) {
4635 state
->symbols
->push_scope();
4636 then_statement
->hir(& stmt
->then_instructions
, state
);
4637 state
->symbols
->pop_scope();
4640 if (else_statement
!= NULL
) {
4641 state
->symbols
->push_scope();
4642 else_statement
->hir(& stmt
->else_instructions
, state
);
4643 state
->symbols
->pop_scope();
4646 instructions
->push_tail(stmt
);
4648 /* if-statements do not have r-values.
4655 ast_switch_statement::hir(exec_list
*instructions
,
4656 struct _mesa_glsl_parse_state
*state
)
4660 ir_rvalue
*const test_expression
=
4661 this->test_expression
->hir(instructions
, state
);
4663 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
4665 * "The type of init-expression in a switch statement must be a
4668 if (!test_expression
->type
->is_scalar() ||
4669 !test_expression
->type
->is_integer()) {
4670 YYLTYPE loc
= this->test_expression
->get_location();
4672 _mesa_glsl_error(& loc
,
4674 "switch-statement expression must be scalar "
4678 /* Track the switch-statement nesting in a stack-like manner.
4680 struct glsl_switch_state saved
= state
->switch_state
;
4682 state
->switch_state
.is_switch_innermost
= true;
4683 state
->switch_state
.switch_nesting_ast
= this;
4684 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
4685 hash_table_pointer_compare
);
4686 state
->switch_state
.previous_default
= NULL
;
4688 /* Initalize is_fallthru state to false.
4690 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
4691 state
->switch_state
.is_fallthru_var
=
4692 new(ctx
) ir_variable(glsl_type::bool_type
,
4693 "switch_is_fallthru_tmp",
4695 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
4697 ir_dereference_variable
*deref_is_fallthru_var
=
4698 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4699 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
4702 /* Initialize continue_inside state to false.
4704 state
->switch_state
.continue_inside
=
4705 new(ctx
) ir_variable(glsl_type::bool_type
,
4706 "continue_inside_tmp",
4708 instructions
->push_tail(state
->switch_state
.continue_inside
);
4710 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
4711 ir_dereference_variable
*deref_continue_inside_var
=
4712 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
4713 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
4716 state
->switch_state
.run_default
=
4717 new(ctx
) ir_variable(glsl_type::bool_type
,
4720 instructions
->push_tail(state
->switch_state
.run_default
);
4722 /* Loop around the switch is used for flow control. */
4723 ir_loop
* loop
= new(ctx
) ir_loop();
4724 instructions
->push_tail(loop
);
4726 /* Cache test expression.
4728 test_to_hir(&loop
->body_instructions
, state
);
4730 /* Emit code for body of switch stmt.
4732 body
->hir(&loop
->body_instructions
, state
);
4734 /* Insert a break at the end to exit loop. */
4735 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4736 loop
->body_instructions
.push_tail(jump
);
4738 /* If we are inside loop, check if continue got called inside switch. */
4739 if (state
->loop_nesting_ast
!= NULL
) {
4740 ir_dereference_variable
*deref_continue_inside
=
4741 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
4742 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
4743 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
4745 if (state
->loop_nesting_ast
!= NULL
) {
4746 if (state
->loop_nesting_ast
->rest_expression
) {
4747 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
4750 if (state
->loop_nesting_ast
->mode
==
4751 ast_iteration_statement::ast_do_while
) {
4752 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
4755 irif
->then_instructions
.push_tail(jump
);
4756 instructions
->push_tail(irif
);
4759 hash_table_dtor(state
->switch_state
.labels_ht
);
4761 state
->switch_state
= saved
;
4763 /* Switch statements do not have r-values. */
4769 ast_switch_statement::test_to_hir(exec_list
*instructions
,
4770 struct _mesa_glsl_parse_state
*state
)
4774 /* Cache value of test expression. */
4775 ir_rvalue
*const test_val
=
4776 test_expression
->hir(instructions
,
4779 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
4782 ir_dereference_variable
*deref_test_var
=
4783 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4785 instructions
->push_tail(state
->switch_state
.test_var
);
4786 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
4791 ast_switch_body::hir(exec_list
*instructions
,
4792 struct _mesa_glsl_parse_state
*state
)
4795 stmts
->hir(instructions
, state
);
4797 /* Switch bodies do not have r-values. */
4802 ast_case_statement_list::hir(exec_list
*instructions
,
4803 struct _mesa_glsl_parse_state
*state
)
4805 exec_list default_case
, after_default
, tmp
;
4807 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
4808 case_stmt
->hir(&tmp
, state
);
4811 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
4812 default_case
.append_list(&tmp
);
4816 /* If default case found, append 'after_default' list. */
4817 if (!default_case
.is_empty())
4818 after_default
.append_list(&tmp
);
4820 instructions
->append_list(&tmp
);
4823 /* Handle the default case. This is done here because default might not be
4824 * the last case. We need to add checks against following cases first to see
4825 * if default should be chosen or not.
4827 if (!default_case
.is_empty()) {
4829 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
4830 ir_dereference_variable
*deref_run_default_var
=
4831 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
4833 /* Choose to run default case initially, following conditional
4834 * assignments might change this.
4836 ir_assignment
*const init_var
=
4837 new(state
) ir_assignment(deref_run_default_var
, true_val
);
4838 instructions
->push_tail(init_var
);
4840 /* Default case was the last one, no checks required. */
4841 if (after_default
.is_empty()) {
4842 instructions
->append_list(&default_case
);
4846 foreach_in_list(ir_instruction
, ir
, &after_default
) {
4847 ir_assignment
*assign
= ir
->as_assignment();
4852 /* Clone the check between case label and init expression. */
4853 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
4854 ir_expression
*clone
= exp
->clone(state
, NULL
);
4856 ir_dereference_variable
*deref_var
=
4857 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
4858 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
4860 ir_assignment
*const set_false
=
4861 new(state
) ir_assignment(deref_var
, false_val
, clone
);
4863 instructions
->push_tail(set_false
);
4866 /* Append default case and all cases after it. */
4867 instructions
->append_list(&default_case
);
4868 instructions
->append_list(&after_default
);
4871 /* Case statements do not have r-values. */
4876 ast_case_statement::hir(exec_list
*instructions
,
4877 struct _mesa_glsl_parse_state
*state
)
4879 labels
->hir(instructions
, state
);
4881 /* Guard case statements depending on fallthru state. */
4882 ir_dereference_variable
*const deref_fallthru_guard
=
4883 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4884 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
4886 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
4887 stmt
->hir(& test_fallthru
->then_instructions
, state
);
4889 instructions
->push_tail(test_fallthru
);
4891 /* Case statements do not have r-values. */
4897 ast_case_label_list::hir(exec_list
*instructions
,
4898 struct _mesa_glsl_parse_state
*state
)
4900 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
4901 label
->hir(instructions
, state
);
4903 /* Case labels do not have r-values. */
4908 ast_case_label::hir(exec_list
*instructions
,
4909 struct _mesa_glsl_parse_state
*state
)
4913 ir_dereference_variable
*deref_fallthru_var
=
4914 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
4916 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
4918 /* If not default case, ... */
4919 if (this->test_value
!= NULL
) {
4920 /* Conditionally set fallthru state based on
4921 * comparison of cached test expression value to case label.
4923 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
4924 ir_constant
*label_const
= label_rval
->constant_expression_value();
4927 YYLTYPE loc
= this->test_value
->get_location();
4929 _mesa_glsl_error(& loc
, state
,
4930 "switch statement case label must be a "
4931 "constant expression");
4933 /* Stuff a dummy value in to allow processing to continue. */
4934 label_const
= new(ctx
) ir_constant(0);
4936 ast_expression
*previous_label
= (ast_expression
*)
4937 hash_table_find(state
->switch_state
.labels_ht
,
4938 (void *)(uintptr_t)label_const
->value
.u
[0]);
4940 if (previous_label
) {
4941 YYLTYPE loc
= this->test_value
->get_location();
4942 _mesa_glsl_error(& loc
, state
, "duplicate case value");
4944 loc
= previous_label
->get_location();
4945 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
4947 hash_table_insert(state
->switch_state
.labels_ht
,
4949 (void *)(uintptr_t)label_const
->value
.u
[0]);
4953 ir_dereference_variable
*deref_test_var
=
4954 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
4956 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
4961 * From GLSL 4.40 specification section 6.2 ("Selection"):
4963 * "The type of the init-expression value in a switch statement must
4964 * be a scalar int or uint. The type of the constant-expression value
4965 * in a case label also must be a scalar int or uint. When any pair
4966 * of these values is tested for "equal value" and the types do not
4967 * match, an implicit conversion will be done to convert the int to a
4968 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
4971 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
4972 YYLTYPE loc
= this->test_value
->get_location();
4974 const glsl_type
*type_a
= label_const
->type
;
4975 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
4977 /* Check if int->uint implicit conversion is supported. */
4978 bool integer_conversion_supported
=
4979 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
4982 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
4983 !integer_conversion_supported
) {
4984 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
4985 "init-expression and case label (%s != %s)",
4986 type_a
->name
, type_b
->name
);
4988 /* Conversion of the case label. */
4989 if (type_a
->base_type
== GLSL_TYPE_INT
) {
4990 if (!apply_implicit_conversion(glsl_type::uint_type
,
4991 test_cond
->operands
[0], state
))
4992 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
4994 /* Conversion of the init-expression value. */
4995 if (!apply_implicit_conversion(glsl_type::uint_type
,
4996 test_cond
->operands
[1], state
))
4997 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5002 ir_assignment
*set_fallthru_on_test
=
5003 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5005 instructions
->push_tail(set_fallthru_on_test
);
5006 } else { /* default case */
5007 if (state
->switch_state
.previous_default
) {
5008 YYLTYPE loc
= this->get_location();
5009 _mesa_glsl_error(& loc
, state
,
5010 "multiple default labels in one switch");
5012 loc
= state
->switch_state
.previous_default
->get_location();
5013 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5015 state
->switch_state
.previous_default
= this;
5017 /* Set fallthru condition on 'run_default' bool. */
5018 ir_dereference_variable
*deref_run_default
=
5019 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5020 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5021 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5025 /* Set falltrhu state. */
5026 ir_assignment
*set_fallthru
=
5027 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5029 instructions
->push_tail(set_fallthru
);
5032 /* Case statements do not have r-values. */
5037 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
5038 struct _mesa_glsl_parse_state
*state
)
5042 if (condition
!= NULL
) {
5043 ir_rvalue
*const cond
=
5044 condition
->hir(instructions
, state
);
5047 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
5048 YYLTYPE loc
= condition
->get_location();
5050 _mesa_glsl_error(& loc
, state
,
5051 "loop condition must be scalar boolean");
5053 /* As the first code in the loop body, generate a block that looks
5054 * like 'if (!condition) break;' as the loop termination condition.
5056 ir_rvalue
*const not_cond
=
5057 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
5059 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
5061 ir_jump
*const break_stmt
=
5062 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5064 if_stmt
->then_instructions
.push_tail(break_stmt
);
5065 instructions
->push_tail(if_stmt
);
5072 ast_iteration_statement::hir(exec_list
*instructions
,
5073 struct _mesa_glsl_parse_state
*state
)
5077 /* For-loops and while-loops start a new scope, but do-while loops do not.
5079 if (mode
!= ast_do_while
)
5080 state
->symbols
->push_scope();
5082 if (init_statement
!= NULL
)
5083 init_statement
->hir(instructions
, state
);
5085 ir_loop
*const stmt
= new(ctx
) ir_loop();
5086 instructions
->push_tail(stmt
);
5088 /* Track the current loop nesting. */
5089 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
5091 state
->loop_nesting_ast
= this;
5093 /* Likewise, indicate that following code is closest to a loop,
5094 * NOT closest to a switch.
5096 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
5097 state
->switch_state
.is_switch_innermost
= false;
5099 if (mode
!= ast_do_while
)
5100 condition_to_hir(&stmt
->body_instructions
, state
);
5103 body
->hir(& stmt
->body_instructions
, state
);
5105 if (rest_expression
!= NULL
)
5106 rest_expression
->hir(& stmt
->body_instructions
, state
);
5108 if (mode
== ast_do_while
)
5109 condition_to_hir(&stmt
->body_instructions
, state
);
5111 if (mode
!= ast_do_while
)
5112 state
->symbols
->pop_scope();
5114 /* Restore previous nesting before returning. */
5115 state
->loop_nesting_ast
= nesting_ast
;
5116 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
5118 /* Loops do not have r-values.
5125 * Determine if the given type is valid for establishing a default precision
5128 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
5130 * "The precision statement
5132 * precision precision-qualifier type;
5134 * can be used to establish a default precision qualifier. The type field
5135 * can be either int or float or any of the sampler types, and the
5136 * precision-qualifier can be lowp, mediump, or highp."
5138 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
5139 * qualifiers on sampler types, but this seems like an oversight (since the
5140 * intention of including these in GLSL 1.30 is to allow compatibility with ES
5141 * shaders). So we allow int, float, and all sampler types regardless of GLSL
5145 is_valid_default_precision_type(const struct glsl_type
*const type
)
5150 switch (type
->base_type
) {
5152 case GLSL_TYPE_FLOAT
:
5153 /* "int" and "float" are valid, but vectors and matrices are not. */
5154 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
5155 case GLSL_TYPE_SAMPLER
:
5164 ast_type_specifier::hir(exec_list
*instructions
,
5165 struct _mesa_glsl_parse_state
*state
)
5167 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
5170 YYLTYPE loc
= this->get_location();
5172 /* If this is a precision statement, check that the type to which it is
5173 * applied is either float or int.
5175 * From section 4.5.3 of the GLSL 1.30 spec:
5176 * "The precision statement
5177 * precision precision-qualifier type;
5178 * can be used to establish a default precision qualifier. The type
5179 * field can be either int or float [...]. Any other types or
5180 * qualifiers will result in an error.
5182 if (this->default_precision
!= ast_precision_none
) {
5183 if (!state
->check_precision_qualifiers_allowed(&loc
))
5186 if (this->structure
!= NULL
) {
5187 _mesa_glsl_error(&loc
, state
,
5188 "precision qualifiers do not apply to structures");
5192 if (this->array_specifier
!= NULL
) {
5193 _mesa_glsl_error(&loc
, state
,
5194 "default precision statements do not apply to "
5199 const struct glsl_type
*const type
=
5200 state
->symbols
->get_type(this->type_name
);
5201 if (!is_valid_default_precision_type(type
)) {
5202 _mesa_glsl_error(&loc
, state
,
5203 "default precision statements apply only to "
5204 "float, int, and sampler types");
5208 if (type
->base_type
== GLSL_TYPE_FLOAT
5210 && state
->stage
== MESA_SHADER_FRAGMENT
) {
5211 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
5214 * "The fragment language has no default precision qualifier for
5215 * floating point types."
5217 * As a result, we have to track whether or not default precision has
5218 * been specified for float in GLSL ES fragment shaders.
5220 * Earlier in that same section, the spec says:
5222 * "Non-precision qualified declarations will use the precision
5223 * qualifier specified in the most recent precision statement
5224 * that is still in scope. The precision statement has the same
5225 * scoping rules as variable declarations. If it is declared
5226 * inside a compound statement, its effect stops at the end of
5227 * the innermost statement it was declared in. Precision
5228 * statements in nested scopes override precision statements in
5229 * outer scopes. Multiple precision statements for the same basic
5230 * type can appear inside the same scope, with later statements
5231 * overriding earlier statements within that scope."
5233 * Default precision specifications follow the same scope rules as
5234 * variables. So, we can track the state of the default float
5235 * precision in the symbol table, and the rules will just work. This
5236 * is a slight abuse of the symbol table, but it has the semantics
5239 ir_variable
*const junk
=
5240 new(state
) ir_variable(type
, "#default precision",
5243 state
->symbols
->add_variable(junk
);
5246 /* FINISHME: Translate precision statements into IR. */
5250 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
5251 * process_record_constructor() can do type-checking on C-style initializer
5252 * expressions of structs, but ast_struct_specifier should only be translated
5253 * to HIR if it is declaring the type of a structure.
5255 * The ->is_declaration field is false for initializers of variables
5256 * declared separately from the struct's type definition.
5258 * struct S { ... }; (is_declaration = true)
5259 * struct T { ... } t = { ... }; (is_declaration = true)
5260 * S s = { ... }; (is_declaration = false)
5262 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
5263 return this->structure
->hir(instructions
, state
);
5270 * Process a structure or interface block tree into an array of structure fields
5272 * After parsing, where there are some syntax differnces, structures and
5273 * interface blocks are almost identical. They are similar enough that the
5274 * AST for each can be processed the same way into a set of
5275 * \c glsl_struct_field to describe the members.
5277 * If we're processing an interface block, var_mode should be the type of the
5278 * interface block (ir_var_shader_in, ir_var_shader_out, or ir_var_uniform).
5279 * If we're processing a structure, var_mode should be ir_var_auto.
5282 * The number of fields processed. A pointer to the array structure fields is
5283 * stored in \c *fields_ret.
5286 ast_process_structure_or_interface_block(exec_list
*instructions
,
5287 struct _mesa_glsl_parse_state
*state
,
5288 exec_list
*declarations
,
5290 glsl_struct_field
**fields_ret
,
5292 enum glsl_matrix_layout matrix_layout
,
5293 bool allow_reserved_names
,
5294 ir_variable_mode var_mode
)
5296 unsigned decl_count
= 0;
5298 /* Make an initial pass over the list of fields to determine how
5299 * many there are. Each element in this list is an ast_declarator_list.
5300 * This means that we actually need to count the number of elements in the
5301 * 'declarations' list in each of the elements.
5303 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
5304 decl_count
+= decl_list
->declarations
.length();
5307 /* Allocate storage for the fields and process the field
5308 * declarations. As the declarations are processed, try to also convert
5309 * the types to HIR. This ensures that structure definitions embedded in
5310 * other structure definitions or in interface blocks are processed.
5312 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
5316 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
5317 const char *type_name
;
5319 decl_list
->type
->specifier
->hir(instructions
, state
);
5321 /* Section 10.9 of the GLSL ES 1.00 specification states that
5322 * embedded structure definitions have been removed from the language.
5324 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
5325 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
5326 "not allowed in GLSL ES 1.00");
5329 const glsl_type
*decl_type
=
5330 decl_list
->type
->glsl_type(& type_name
, state
);
5332 foreach_list_typed (ast_declaration
, decl
, link
,
5333 &decl_list
->declarations
) {
5334 if (!allow_reserved_names
)
5335 validate_identifier(decl
->identifier
, loc
, state
);
5337 /* From section 4.3.9 of the GLSL 4.40 spec:
5339 * "[In interface blocks] opaque types are not allowed."
5341 * It should be impossible for decl_type to be NULL here. Cases that
5342 * might naturally lead to decl_type being NULL, especially for the
5343 * is_interface case, will have resulted in compilation having
5344 * already halted due to a syntax error.
5346 const struct glsl_type
*field_type
=
5347 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
5349 if (is_interface
&& field_type
->contains_opaque()) {
5350 YYLTYPE loc
= decl_list
->get_location();
5351 _mesa_glsl_error(&loc
, state
,
5352 "uniform in non-default uniform block contains "
5356 if (field_type
->contains_atomic()) {
5357 /* FINISHME: Add a spec quotation here once updated spec
5358 * FINISHME: language is available. See Khronos bug #10903
5359 * FINISHME: on whether atomic counters are allowed in
5360 * FINISHME: structures.
5362 YYLTYPE loc
= decl_list
->get_location();
5363 _mesa_glsl_error(&loc
, state
, "atomic counter in structure or "
5367 if (field_type
->contains_image()) {
5368 /* FINISHME: Same problem as with atomic counters.
5369 * FINISHME: Request clarification from Khronos and add
5370 * FINISHME: spec quotation here.
5372 YYLTYPE loc
= decl_list
->get_location();
5373 _mesa_glsl_error(&loc
, state
,
5374 "image in structure or uniform block");
5377 const struct ast_type_qualifier
*const qual
=
5378 & decl_list
->type
->qualifier
;
5379 if (qual
->flags
.q
.std140
||
5380 qual
->flags
.q
.packed
||
5381 qual
->flags
.q
.shared
) {
5382 _mesa_glsl_error(&loc
, state
,
5383 "uniform block layout qualifiers std140, packed, and "
5384 "shared can only be applied to uniform blocks, not "
5388 if (qual
->flags
.q
.constant
) {
5389 YYLTYPE loc
= decl_list
->get_location();
5390 _mesa_glsl_error(&loc
, state
,
5391 "const storage qualifier cannot be applied "
5392 "to struct or interface block members");
5395 field_type
= process_array_type(&loc
, decl_type
,
5396 decl
->array_specifier
, state
);
5397 fields
[i
].type
= field_type
;
5398 fields
[i
].name
= decl
->identifier
;
5399 fields
[i
].location
= -1;
5400 fields
[i
].interpolation
=
5401 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
5402 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
5403 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
5405 /* Only save explicitly defined streams in block's field */
5406 fields
[i
].stream
= qual
->flags
.q
.explicit_stream
? qual
->stream
: -1;
5408 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
5409 if (!qual
->flags
.q
.uniform
) {
5410 _mesa_glsl_error(&loc
, state
,
5411 "row_major and column_major can only be "
5412 "applied to uniform interface blocks");
5414 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
5417 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
5418 _mesa_glsl_error(&loc
, state
,
5419 "interpolation qualifiers cannot be used "
5420 "with uniform interface blocks");
5423 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
5424 qual
->has_auxiliary_storage()) {
5425 _mesa_glsl_error(&loc
, state
,
5426 "auxiliary storage qualifiers cannot be used "
5427 "in uniform blocks or structures.");
5430 /* Propogate row- / column-major information down the fields of the
5431 * structure or interface block. Structures need this data because
5432 * the structure may contain a structure that contains ... a matrix
5433 * that need the proper layout.
5435 if (field_type
->without_array()->is_matrix()
5436 || field_type
->without_array()->is_record()) {
5437 /* If no layout is specified for the field, inherit the layout
5440 fields
[i
].matrix_layout
= matrix_layout
;
5442 if (qual
->flags
.q
.row_major
)
5443 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
5444 else if (qual
->flags
.q
.column_major
)
5445 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
5447 /* If we're processing an interface block, the matrix layout must
5448 * be decided by this point.
5450 assert(!is_interface
5451 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
5452 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
5459 assert(i
== decl_count
);
5461 *fields_ret
= fields
;
5467 ast_struct_specifier::hir(exec_list
*instructions
,
5468 struct _mesa_glsl_parse_state
*state
)
5470 YYLTYPE loc
= this->get_location();
5472 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
5474 * "Anonymous structures are not supported; so embedded structures must
5475 * have a declarator. A name given to an embedded struct is scoped at
5476 * the same level as the struct it is embedded in."
5478 * The same section of the GLSL 1.20 spec says:
5480 * "Anonymous structures are not supported. Embedded structures are not
5483 * struct S { float f; };
5485 * S; // Error: anonymous structures disallowed
5486 * struct { ... }; // Error: embedded structures disallowed
5487 * S s; // Okay: nested structures with name are allowed
5490 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
5491 * we allow embedded structures in 1.10 only.
5493 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
5494 _mesa_glsl_error(&loc
, state
,
5495 "embedded structure declarations are not allowed");
5497 state
->struct_specifier_depth
++;
5499 glsl_struct_field
*fields
;
5500 unsigned decl_count
=
5501 ast_process_structure_or_interface_block(instructions
,
5503 &this->declarations
,
5507 GLSL_MATRIX_LAYOUT_INHERITED
,
5508 false /* allow_reserved_names */,
5511 validate_identifier(this->name
, loc
, state
);
5513 const glsl_type
*t
=
5514 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
5516 if (!state
->symbols
->add_type(name
, t
)) {
5517 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
5519 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
5521 state
->num_user_structures
+ 1);
5523 s
[state
->num_user_structures
] = t
;
5524 state
->user_structures
= s
;
5525 state
->num_user_structures
++;
5529 state
->struct_specifier_depth
--;
5531 /* Structure type definitions do not have r-values.
5538 * Visitor class which detects whether a given interface block has been used.
5540 class interface_block_usage_visitor
: public ir_hierarchical_visitor
5543 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
5544 : mode(mode
), block(block
), found(false)
5548 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
5550 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
5554 return visit_continue
;
5557 bool usage_found() const
5563 ir_variable_mode mode
;
5564 const glsl_type
*block
;
5570 ast_interface_block::hir(exec_list
*instructions
,
5571 struct _mesa_glsl_parse_state
*state
)
5573 YYLTYPE loc
= this->get_location();
5575 /* Interface blocks must be declared at global scope */
5576 if (state
->current_function
!= NULL
) {
5577 _mesa_glsl_error(&loc
, state
,
5578 "Interface block `%s' must be declared "
5583 /* The ast_interface_block has a list of ast_declarator_lists. We
5584 * need to turn those into ir_variables with an association
5585 * with this uniform block.
5587 enum glsl_interface_packing packing
;
5588 if (this->layout
.flags
.q
.shared
) {
5589 packing
= GLSL_INTERFACE_PACKING_SHARED
;
5590 } else if (this->layout
.flags
.q
.packed
) {
5591 packing
= GLSL_INTERFACE_PACKING_PACKED
;
5593 /* The default layout is std140.
5595 packing
= GLSL_INTERFACE_PACKING_STD140
;
5598 ir_variable_mode var_mode
;
5599 const char *iface_type_name
;
5600 if (this->layout
.flags
.q
.in
) {
5601 var_mode
= ir_var_shader_in
;
5602 iface_type_name
= "in";
5603 } else if (this->layout
.flags
.q
.out
) {
5604 var_mode
= ir_var_shader_out
;
5605 iface_type_name
= "out";
5606 } else if (this->layout
.flags
.q
.uniform
) {
5607 var_mode
= ir_var_uniform
;
5608 iface_type_name
= "uniform";
5610 var_mode
= ir_var_auto
;
5611 iface_type_name
= "UNKNOWN";
5612 assert(!"interface block layout qualifier not found!");
5615 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
5616 if (this->layout
.flags
.q
.row_major
)
5617 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
5618 else if (this->layout
.flags
.q
.column_major
)
5619 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
5621 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
5622 exec_list declared_variables
;
5623 glsl_struct_field
*fields
;
5625 /* Treat an interface block as one level of nesting, so that embedded struct
5626 * specifiers will be disallowed.
5628 state
->struct_specifier_depth
++;
5630 unsigned int num_variables
=
5631 ast_process_structure_or_interface_block(&declared_variables
,
5633 &this->declarations
,
5638 redeclaring_per_vertex
,
5641 state
->struct_specifier_depth
--;
5643 if (!redeclaring_per_vertex
) {
5644 validate_identifier(this->block_name
, loc
, state
);
5646 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
5648 * "Block names have no other use within a shader beyond interface
5649 * matching; it is a compile-time error to use a block name at global
5650 * scope for anything other than as a block name."
5652 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
5653 if (var
&& !var
->type
->is_interface()) {
5654 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
5655 "already used in the scope.",
5660 const glsl_type
*earlier_per_vertex
= NULL
;
5661 if (redeclaring_per_vertex
) {
5662 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
5663 * the named interface block gl_in, we can find it by looking at the
5664 * previous declaration of gl_in. Otherwise we can find it by looking
5665 * at the previous decalartion of any of the built-in outputs,
5668 * Also check that the instance name and array-ness of the redeclaration
5672 case ir_var_shader_in
:
5673 if (ir_variable
*earlier_gl_in
=
5674 state
->symbols
->get_variable("gl_in")) {
5675 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
5677 _mesa_glsl_error(&loc
, state
,
5678 "redeclaration of gl_PerVertex input not allowed "
5680 _mesa_shader_stage_to_string(state
->stage
));
5682 if (this->instance_name
== NULL
||
5683 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
) {
5684 _mesa_glsl_error(&loc
, state
,
5685 "gl_PerVertex input must be redeclared as "
5689 case ir_var_shader_out
:
5690 if (ir_variable
*earlier_gl_Position
=
5691 state
->symbols
->get_variable("gl_Position")) {
5692 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
5694 _mesa_glsl_error(&loc
, state
,
5695 "redeclaration of gl_PerVertex output not "
5696 "allowed in the %s shader",
5697 _mesa_shader_stage_to_string(state
->stage
));
5699 if (this->instance_name
!= NULL
) {
5700 _mesa_glsl_error(&loc
, state
,
5701 "gl_PerVertex output may not be redeclared with "
5702 "an instance name");
5706 _mesa_glsl_error(&loc
, state
,
5707 "gl_PerVertex must be declared as an input or an "
5712 if (earlier_per_vertex
== NULL
) {
5713 /* An error has already been reported. Bail out to avoid null
5714 * dereferences later in this function.
5719 /* Copy locations from the old gl_PerVertex interface block. */
5720 for (unsigned i
= 0; i
< num_variables
; i
++) {
5721 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
5723 _mesa_glsl_error(&loc
, state
,
5724 "redeclaration of gl_PerVertex must be a subset "
5725 "of the built-in members of gl_PerVertex");
5727 fields
[i
].location
=
5728 earlier_per_vertex
->fields
.structure
[j
].location
;
5729 fields
[i
].interpolation
=
5730 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
5731 fields
[i
].centroid
=
5732 earlier_per_vertex
->fields
.structure
[j
].centroid
;
5734 earlier_per_vertex
->fields
.structure
[j
].sample
;
5738 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
5741 * If a built-in interface block is redeclared, it must appear in
5742 * the shader before any use of any member included in the built-in
5743 * declaration, or a compilation error will result.
5745 * This appears to be a clarification to the behaviour established for
5746 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
5747 * regardless of GLSL version.
5749 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
5750 v
.run(instructions
);
5751 if (v
.usage_found()) {
5752 _mesa_glsl_error(&loc
, state
,
5753 "redeclaration of a built-in interface block must "
5754 "appear before any use of any member of the "
5759 const glsl_type
*block_type
=
5760 glsl_type::get_interface_instance(fields
,
5765 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
5766 YYLTYPE loc
= this->get_location();
5767 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
5768 "already taken in the current scope",
5769 this->block_name
, iface_type_name
);
5772 /* Since interface blocks cannot contain statements, it should be
5773 * impossible for the block to generate any instructions.
5775 assert(declared_variables
.is_empty());
5777 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5779 * Geometry shader input variables get the per-vertex values written
5780 * out by vertex shader output variables of the same names. Since a
5781 * geometry shader operates on a set of vertices, each input varying
5782 * variable (or input block, see interface blocks below) needs to be
5783 * declared as an array.
5785 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
5786 var_mode
== ir_var_shader_in
) {
5787 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
5790 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
5793 * "If an instance name (instance-name) is used, then it puts all the
5794 * members inside a scope within its own name space, accessed with the
5795 * field selector ( . ) operator (analogously to structures)."
5797 if (this->instance_name
) {
5798 if (redeclaring_per_vertex
) {
5799 /* When a built-in in an unnamed interface block is redeclared,
5800 * get_variable_being_redeclared() calls
5801 * check_builtin_array_max_size() to make sure that built-in array
5802 * variables aren't redeclared to illegal sizes. But we're looking
5803 * at a redeclaration of a named built-in interface block. So we
5804 * have to manually call check_builtin_array_max_size() for all parts
5805 * of the interface that are arrays.
5807 for (unsigned i
= 0; i
< num_variables
; i
++) {
5808 if (fields
[i
].type
->is_array()) {
5809 const unsigned size
= fields
[i
].type
->array_size();
5810 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
5814 validate_identifier(this->instance_name
, loc
, state
);
5819 if (this->array_specifier
!= NULL
) {
5820 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
5822 * For uniform blocks declared an array, each individual array
5823 * element corresponds to a separate buffer object backing one
5824 * instance of the block. As the array size indicates the number
5825 * of buffer objects needed, uniform block array declarations
5826 * must specify an array size.
5828 * And a few paragraphs later:
5830 * Geometry shader input blocks must be declared as arrays and
5831 * follow the array declaration and linking rules for all
5832 * geometry shader inputs. All other input and output block
5833 * arrays must specify an array size.
5835 * The upshot of this is that the only circumstance where an
5836 * interface array size *doesn't* need to be specified is on a
5837 * geometry shader input.
5839 if (this->array_specifier
->is_unsized_array
&&
5840 (state
->stage
!= MESA_SHADER_GEOMETRY
|| !this->layout
.flags
.q
.in
)) {
5841 _mesa_glsl_error(&loc
, state
,
5842 "only geometry shader inputs may be unsized "
5843 "instance block arrays");
5847 const glsl_type
*block_array_type
=
5848 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
5850 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
5852 * * Arrays of arrays of blocks are not allowed
5854 if (state
->es_shader
&& block_array_type
->is_array() &&
5855 block_array_type
->fields
.array
->is_array()) {
5856 _mesa_glsl_error(&loc
, state
,
5857 "arrays of arrays interface blocks are "
5861 var
= new(state
) ir_variable(block_array_type
,
5862 this->instance_name
,
5865 var
= new(state
) ir_variable(block_type
,
5866 this->instance_name
,
5870 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
5871 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
5873 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
5874 var
->data
.read_only
= true;
5876 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
5877 handle_geometry_shader_input_decl(state
, loc
, var
);
5879 if (ir_variable
*earlier
=
5880 state
->symbols
->get_variable(this->instance_name
)) {
5881 if (!redeclaring_per_vertex
) {
5882 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
5883 this->instance_name
);
5885 earlier
->data
.how_declared
= ir_var_declared_normally
;
5886 earlier
->type
= var
->type
;
5887 earlier
->reinit_interface_type(block_type
);
5890 /* Propagate the "binding" keyword into this UBO's fields;
5891 * the UBO declaration itself doesn't get an ir_variable unless it
5892 * has an instance name. This is ugly.
5894 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
5895 var
->data
.binding
= this->layout
.binding
;
5897 state
->symbols
->add_variable(var
);
5898 instructions
->push_tail(var
);
5901 /* In order to have an array size, the block must also be declared with
5904 assert(this->array_specifier
== NULL
);
5906 for (unsigned i
= 0; i
< num_variables
; i
++) {
5908 new(state
) ir_variable(fields
[i
].type
,
5909 ralloc_strdup(state
, fields
[i
].name
),
5911 var
->data
.interpolation
= fields
[i
].interpolation
;
5912 var
->data
.centroid
= fields
[i
].centroid
;
5913 var
->data
.sample
= fields
[i
].sample
;
5914 var
->init_interface_type(block_type
);
5916 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
5917 var
->data
.read_only
= true;
5919 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
5920 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
5921 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
5923 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
5926 if (fields
[i
].stream
!= -1 &&
5927 ((unsigned)fields
[i
].stream
) != this->layout
.stream
) {
5928 _mesa_glsl_error(&loc
, state
,
5929 "stream layout qualifier on "
5930 "interface block member `%s' does not match "
5931 "the interface block (%d vs %d)",
5932 var
->name
, fields
[i
].stream
, this->layout
.stream
);
5935 var
->data
.stream
= this->layout
.stream
;
5937 /* Examine var name here since var may get deleted in the next call */
5938 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5940 if (redeclaring_per_vertex
) {
5941 ir_variable
*earlier
=
5942 get_variable_being_redeclared(var
, loc
, state
,
5943 true /* allow_all_redeclarations */);
5944 if (!var_is_gl_id
|| earlier
== NULL
) {
5945 _mesa_glsl_error(&loc
, state
,
5946 "redeclaration of gl_PerVertex can only "
5947 "include built-in variables");
5948 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
5949 _mesa_glsl_error(&loc
, state
,
5950 "`%s' has already been redeclared",
5953 earlier
->data
.how_declared
= ir_var_declared_in_block
;
5954 earlier
->reinit_interface_type(block_type
);
5959 if (state
->symbols
->get_variable(var
->name
) != NULL
)
5960 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
5962 /* Propagate the "binding" keyword into this UBO's fields;
5963 * the UBO declaration itself doesn't get an ir_variable unless it
5964 * has an instance name. This is ugly.
5966 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
5967 var
->data
.binding
= this->layout
.binding
;
5969 state
->symbols
->add_variable(var
);
5970 instructions
->push_tail(var
);
5973 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
5974 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
5976 * It is also a compilation error ... to redeclare a built-in
5977 * block and then use a member from that built-in block that was
5978 * not included in the redeclaration.
5980 * This appears to be a clarification to the behaviour established
5981 * for gl_PerVertex by GLSL 1.50, therefore we implement this
5982 * behaviour regardless of GLSL version.
5984 * To prevent the shader from using a member that was not included in
5985 * the redeclaration, we disable any ir_variables that are still
5986 * associated with the old declaration of gl_PerVertex (since we've
5987 * already updated all of the variables contained in the new
5988 * gl_PerVertex to point to it).
5990 * As a side effect this will prevent
5991 * validate_intrastage_interface_blocks() from getting confused and
5992 * thinking there are conflicting definitions of gl_PerVertex in the
5995 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
5996 ir_variable
*const var
= node
->as_variable();
5998 var
->get_interface_type() == earlier_per_vertex
&&
5999 var
->data
.mode
== var_mode
) {
6000 if (var
->data
.how_declared
== ir_var_declared_normally
) {
6001 _mesa_glsl_error(&loc
, state
,
6002 "redeclaration of gl_PerVertex cannot "
6003 "follow a redeclaration of `%s'",
6006 state
->symbols
->disable_variable(var
->name
);
6018 ast_gs_input_layout::hir(exec_list
*instructions
,
6019 struct _mesa_glsl_parse_state
*state
)
6021 YYLTYPE loc
= this->get_location();
6023 /* If any geometry input layout declaration preceded this one, make sure it
6024 * was consistent with this one.
6026 if (state
->gs_input_prim_type_specified
&&
6027 state
->in_qualifier
->prim_type
!= this->prim_type
) {
6028 _mesa_glsl_error(&loc
, state
,
6029 "geometry shader input layout does not match"
6030 " previous declaration");
6034 /* If any shader inputs occurred before this declaration and specified an
6035 * array size, make sure the size they specified is consistent with the
6038 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
6039 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
6040 _mesa_glsl_error(&loc
, state
,
6041 "this geometry shader input layout implies %u vertices"
6042 " per primitive, but a previous input is declared"
6043 " with size %u", num_vertices
, state
->gs_input_size
);
6047 state
->gs_input_prim_type_specified
= true;
6049 /* If any shader inputs occurred before this declaration and did not
6050 * specify an array size, their size is determined now.
6052 foreach_in_list(ir_instruction
, node
, instructions
) {
6053 ir_variable
*var
= node
->as_variable();
6054 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
6057 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
6061 if (var
->type
->is_unsized_array()) {
6062 if (var
->data
.max_array_access
>= num_vertices
) {
6063 _mesa_glsl_error(&loc
, state
,
6064 "this geometry shader input layout implies %u"
6065 " vertices, but an access to element %u of input"
6066 " `%s' already exists", num_vertices
,
6067 var
->data
.max_array_access
, var
->name
);
6069 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
6080 ast_cs_input_layout::hir(exec_list
*instructions
,
6081 struct _mesa_glsl_parse_state
*state
)
6083 YYLTYPE loc
= this->get_location();
6085 /* If any compute input layout declaration preceded this one, make sure it
6086 * was consistent with this one.
6088 if (state
->cs_input_local_size_specified
) {
6089 for (int i
= 0; i
< 3; i
++) {
6090 if (state
->cs_input_local_size
[i
] != this->local_size
[i
]) {
6091 _mesa_glsl_error(&loc
, state
,
6092 "compute shader input layout does not match"
6093 " previous declaration");
6099 /* From the ARB_compute_shader specification:
6101 * If the local size of the shader in any dimension is greater
6102 * than the maximum size supported by the implementation for that
6103 * dimension, a compile-time error results.
6105 * It is not clear from the spec how the error should be reported if
6106 * the total size of the work group exceeds
6107 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
6108 * report it at compile time as well.
6110 GLuint64 total_invocations
= 1;
6111 for (int i
= 0; i
< 3; i
++) {
6112 if (this->local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
6113 _mesa_glsl_error(&loc
, state
,
6114 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
6116 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
6119 total_invocations
*= this->local_size
[i
];
6120 if (total_invocations
>
6121 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
6122 _mesa_glsl_error(&loc
, state
,
6123 "product of local_sizes exceeds "
6124 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
6125 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
6130 state
->cs_input_local_size_specified
= true;
6131 for (int i
= 0; i
< 3; i
++)
6132 state
->cs_input_local_size
[i
] = this->local_size
[i
];
6134 /* We may now declare the built-in constant gl_WorkGroupSize (see
6135 * builtin_variable_generator::generate_constants() for why we didn't
6136 * declare it earlier).
6138 ir_variable
*var
= new(state
->symbols
)
6139 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
6140 var
->data
.how_declared
= ir_var_declared_implicitly
;
6141 var
->data
.read_only
= true;
6142 instructions
->push_tail(var
);
6143 state
->symbols
->add_variable(var
);
6144 ir_constant_data data
;
6145 memset(&data
, 0, sizeof(data
));
6146 for (int i
= 0; i
< 3; i
++)
6147 data
.u
[i
] = this->local_size
[i
];
6148 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
6149 var
->constant_initializer
=
6150 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
6151 var
->data
.has_initializer
= true;
6158 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
6159 exec_list
*instructions
)
6161 bool gl_FragColor_assigned
= false;
6162 bool gl_FragData_assigned
= false;
6163 bool user_defined_fs_output_assigned
= false;
6164 ir_variable
*user_defined_fs_output
= NULL
;
6166 /* It would be nice to have proper location information. */
6168 memset(&loc
, 0, sizeof(loc
));
6170 foreach_in_list(ir_instruction
, node
, instructions
) {
6171 ir_variable
*var
= node
->as_variable();
6173 if (!var
|| !var
->data
.assigned
)
6176 if (strcmp(var
->name
, "gl_FragColor") == 0)
6177 gl_FragColor_assigned
= true;
6178 else if (strcmp(var
->name
, "gl_FragData") == 0)
6179 gl_FragData_assigned
= true;
6180 else if (!is_gl_identifier(var
->name
)) {
6181 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
6182 var
->data
.mode
== ir_var_shader_out
) {
6183 user_defined_fs_output_assigned
= true;
6184 user_defined_fs_output
= var
;
6189 /* From the GLSL 1.30 spec:
6191 * "If a shader statically assigns a value to gl_FragColor, it
6192 * may not assign a value to any element of gl_FragData. If a
6193 * shader statically writes a value to any element of
6194 * gl_FragData, it may not assign a value to
6195 * gl_FragColor. That is, a shader may assign values to either
6196 * gl_FragColor or gl_FragData, but not both. Multiple shaders
6197 * linked together must also consistently write just one of
6198 * these variables. Similarly, if user declared output
6199 * variables are in use (statically assigned to), then the
6200 * built-in variables gl_FragColor and gl_FragData may not be
6201 * assigned to. These incorrect usages all generate compile
6204 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
6205 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6206 "`gl_FragColor' and `gl_FragData'");
6207 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
6208 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6209 "`gl_FragColor' and `%s'",
6210 user_defined_fs_output
->name
);
6211 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
6212 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6213 "`gl_FragData' and `%s'",
6214 user_defined_fs_output
->name
);
6220 remove_per_vertex_blocks(exec_list
*instructions
,
6221 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
6223 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
6224 * if it exists in this shader type.
6226 const glsl_type
*per_vertex
= NULL
;
6228 case ir_var_shader_in
:
6229 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
6230 per_vertex
= gl_in
->get_interface_type();
6232 case ir_var_shader_out
:
6233 if (ir_variable
*gl_Position
=
6234 state
->symbols
->get_variable("gl_Position")) {
6235 per_vertex
= gl_Position
->get_interface_type();
6239 assert(!"Unexpected mode");
6243 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
6244 * need to do anything.
6246 if (per_vertex
== NULL
)
6249 /* If the interface block is used by the shader, then we don't need to do
6252 interface_block_usage_visitor
v(mode
, per_vertex
);
6253 v
.run(instructions
);
6254 if (v
.usage_found())
6257 /* Remove any ir_variable declarations that refer to the interface block
6260 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
6261 ir_variable
*const var
= node
->as_variable();
6262 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
6263 var
->data
.mode
== mode
) {
6264 state
->symbols
->disable_variable(var
->name
);