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 "compiler/glsl_types.h"
56 #include "program/hash_table.h"
57 #include "main/shaderobj.h"
59 #include "ir_builder.h"
61 using namespace ir_builder
;
64 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
65 exec_list
*instructions
);
67 remove_per_vertex_blocks(exec_list
*instructions
,
68 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
71 * Visitor class that finds the first instance of any write-only variable that
72 * is ever read, if any
74 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
77 read_from_write_only_variable_visitor() : found(NULL
)
81 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
83 if (this->in_assignee
)
84 return visit_continue
;
86 ir_variable
*var
= ir
->variable_referenced();
87 /* We can have image_write_only set on both images and buffer variables,
88 * but in the former there is a distinction between reads from
89 * the variable itself (write_only) and from the memory they point to
90 * (image_write_only), while in the case of buffer variables there is
91 * no such distinction, that is why this check here is limited to
92 * buffer variables alone.
94 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
95 return visit_continue
;
97 if (var
->data
.image_write_only
) {
102 return visit_continue
;
105 ir_variable
*get_variable() {
109 virtual ir_visitor_status
visit_enter(ir_expression
*ir
)
111 /* .length() doesn't actually read anything */
112 if (ir
->operation
== ir_unop_ssbo_unsized_array_length
)
113 return visit_continue_with_parent
;
115 return visit_continue
;
123 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
125 _mesa_glsl_initialize_variables(instructions
, state
);
127 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
129 state
->current_function
= NULL
;
131 state
->toplevel_ir
= instructions
;
133 state
->gs_input_prim_type_specified
= false;
134 state
->tcs_output_vertices_specified
= false;
135 state
->cs_input_local_size_specified
= false;
137 /* Section 4.2 of the GLSL 1.20 specification states:
138 * "The built-in functions are scoped in a scope outside the global scope
139 * users declare global variables in. That is, a shader's global scope,
140 * available for user-defined functions and global variables, is nested
141 * inside the scope containing the built-in functions."
143 * Since built-in functions like ftransform() access built-in variables,
144 * it follows that those must be in the outer scope as well.
146 * We push scope here to create this nesting effect...but don't pop.
147 * This way, a shader's globals are still in the symbol table for use
150 state
->symbols
->push_scope();
152 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
153 ast
->hir(instructions
, state
);
155 detect_recursion_unlinked(state
, instructions
);
156 detect_conflicting_assignments(state
, instructions
);
158 state
->toplevel_ir
= NULL
;
160 /* Move all of the variable declarations to the front of the IR list, and
161 * reverse the order. This has the (intended!) side effect that vertex
162 * shader inputs and fragment shader outputs will appear in the IR in the
163 * same order that they appeared in the shader code. This results in the
164 * locations being assigned in the declared order. Many (arguably buggy)
165 * applications depend on this behavior, and it matches what nearly all
168 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
169 ir_variable
*const var
= node
->as_variable();
175 instructions
->push_head(var
);
178 /* Figure out if gl_FragCoord is actually used in fragment shader */
179 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
181 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
183 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
185 * If multiple shaders using members of a built-in block belonging to
186 * the same interface are linked together in the same program, they
187 * must all redeclare the built-in block in the same way, as described
188 * in section 4.3.7 "Interface Blocks" for interface block matching, or
189 * a link error will result.
191 * The phrase "using members of a built-in block" implies that if two
192 * shaders are linked together and one of them *does not use* any members
193 * of the built-in block, then that shader does not need to have a matching
194 * redeclaration of the built-in block.
196 * This appears to be a clarification to the behaviour established for
197 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
200 * The definition of "interface" in section 4.3.7 that applies here is as
203 * The boundary between adjacent programmable pipeline stages: This
204 * spans all the outputs in all compilation units of the first stage
205 * and all the inputs in all compilation units of the second stage.
207 * Therefore this rule applies to both inter- and intra-stage linking.
209 * The easiest way to implement this is to check whether the shader uses
210 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
211 * remove all the relevant variable declaration from the IR, so that the
212 * linker won't see them and complain about mismatches.
214 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
215 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
217 /* Check that we don't have reads from write-only variables */
218 read_from_write_only_variable_visitor v
;
220 ir_variable
*error_var
= v
.get_variable();
222 /* It would be nice to have proper location information, but for that
223 * we would need to check this as we process each kind of AST node
226 memset(&loc
, 0, sizeof(loc
));
227 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
233 static ir_expression_operation
234 get_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
235 struct _mesa_glsl_parse_state
*state
)
237 switch (to
->base_type
) {
238 case GLSL_TYPE_FLOAT
:
239 switch (from
->base_type
) {
240 case GLSL_TYPE_INT
: return ir_unop_i2f
;
241 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
242 case GLSL_TYPE_DOUBLE
: return ir_unop_d2f
;
243 default: return (ir_expression_operation
)0;
247 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
)
248 return (ir_expression_operation
)0;
249 switch (from
->base_type
) {
250 case GLSL_TYPE_INT
: return ir_unop_i2u
;
251 default: return (ir_expression_operation
)0;
254 case GLSL_TYPE_DOUBLE
:
255 if (!state
->has_double())
256 return (ir_expression_operation
)0;
257 switch (from
->base_type
) {
258 case GLSL_TYPE_INT
: return ir_unop_i2d
;
259 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
260 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
261 default: return (ir_expression_operation
)0;
264 default: return (ir_expression_operation
)0;
270 * If a conversion is available, convert one operand to a different type
272 * The \c from \c ir_rvalue is converted "in place".
274 * \param to Type that the operand it to be converted to
275 * \param from Operand that is being converted
276 * \param state GLSL compiler state
279 * If a conversion is possible (or unnecessary), \c true is returned.
280 * Otherwise \c false is returned.
283 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
284 struct _mesa_glsl_parse_state
*state
)
287 if (to
->base_type
== from
->type
->base_type
)
290 /* Prior to GLSL 1.20, there are no implicit conversions */
291 if (!state
->is_version(120, 0))
294 /* ESSL does not allow implicit conversions */
295 if (state
->es_shader
)
298 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
300 * "There are no implicit array or structure conversions. For
301 * example, an array of int cannot be implicitly converted to an
304 if (!to
->is_numeric() || !from
->type
->is_numeric())
307 /* We don't actually want the specific type `to`, we want a type
308 * with the same base type as `to`, but the same vector width as
311 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
312 from
->type
->matrix_columns
);
314 ir_expression_operation op
= get_conversion_operation(to
, from
->type
, state
);
316 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
324 static const struct glsl_type
*
325 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
327 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
329 const glsl_type
*type_a
= value_a
->type
;
330 const glsl_type
*type_b
= value_b
->type
;
332 /* From GLSL 1.50 spec, page 56:
334 * "The arithmetic binary operators add (+), subtract (-),
335 * multiply (*), and divide (/) operate on integer and
336 * floating-point scalars, vectors, and matrices."
338 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
339 _mesa_glsl_error(loc
, state
,
340 "operands to arithmetic operators must be numeric");
341 return glsl_type::error_type
;
345 /* "If one operand is floating-point based and the other is
346 * not, then the conversions from Section 4.1.10 "Implicit
347 * Conversions" are applied to the non-floating-point-based operand."
349 if (!apply_implicit_conversion(type_a
, value_b
, state
)
350 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
351 _mesa_glsl_error(loc
, state
,
352 "could not implicitly convert operands to "
353 "arithmetic operator");
354 return glsl_type::error_type
;
356 type_a
= value_a
->type
;
357 type_b
= value_b
->type
;
359 /* "If the operands are integer types, they must both be signed or
362 * From this rule and the preceeding conversion it can be inferred that
363 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
364 * The is_numeric check above already filtered out the case where either
365 * type is not one of these, so now the base types need only be tested for
368 if (type_a
->base_type
!= type_b
->base_type
) {
369 _mesa_glsl_error(loc
, state
,
370 "base type mismatch for arithmetic operator");
371 return glsl_type::error_type
;
374 /* "All arithmetic binary operators result in the same fundamental type
375 * (signed integer, unsigned integer, or floating-point) as the
376 * operands they operate on, after operand type conversion. After
377 * conversion, the following cases are valid
379 * * The two operands are scalars. In this case the operation is
380 * applied, resulting in a scalar."
382 if (type_a
->is_scalar() && type_b
->is_scalar())
385 /* "* One operand is a scalar, and the other is a vector or matrix.
386 * In this case, the scalar operation is applied independently to each
387 * component of the vector or matrix, resulting in the same size
390 if (type_a
->is_scalar()) {
391 if (!type_b
->is_scalar())
393 } else if (type_b
->is_scalar()) {
397 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
398 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
401 assert(!type_a
->is_scalar());
402 assert(!type_b
->is_scalar());
404 /* "* The two operands are vectors of the same size. In this case, the
405 * operation is done component-wise resulting in the same size
408 if (type_a
->is_vector() && type_b
->is_vector()) {
409 if (type_a
== type_b
) {
412 _mesa_glsl_error(loc
, state
,
413 "vector size mismatch for arithmetic operator");
414 return glsl_type::error_type
;
418 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
419 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
420 * <vector, vector> have been handled. At least one of the operands must
421 * be matrix. Further, since there are no integer matrix types, the base
422 * type of both operands must be float.
424 assert(type_a
->is_matrix() || type_b
->is_matrix());
425 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
||
426 type_a
->base_type
== GLSL_TYPE_DOUBLE
);
427 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
||
428 type_b
->base_type
== GLSL_TYPE_DOUBLE
);
430 /* "* The operator is add (+), subtract (-), or divide (/), and the
431 * operands are matrices with the same number of rows and the same
432 * number of columns. In this case, the operation is done component-
433 * wise resulting in the same size matrix."
434 * * The operator is multiply (*), where both operands are matrices or
435 * one operand is a vector and the other a matrix. A right vector
436 * operand is treated as a column vector and a left vector operand as a
437 * row vector. In all these cases, it is required that the number of
438 * columns of the left operand is equal to the number of rows of the
439 * right operand. Then, the multiply (*) operation does a linear
440 * algebraic multiply, yielding an object that has the same number of
441 * rows as the left operand and the same number of columns as the right
442 * operand. Section 5.10 "Vector and Matrix Operations" explains in
443 * more detail how vectors and matrices are operated on."
446 if (type_a
== type_b
)
449 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
451 if (type
== glsl_type::error_type
) {
452 _mesa_glsl_error(loc
, state
,
453 "size mismatch for matrix multiplication");
460 /* "All other cases are illegal."
462 _mesa_glsl_error(loc
, state
, "type mismatch");
463 return glsl_type::error_type
;
467 static const struct glsl_type
*
468 unary_arithmetic_result_type(const struct glsl_type
*type
,
469 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
471 /* From GLSL 1.50 spec, page 57:
473 * "The arithmetic unary operators negate (-), post- and pre-increment
474 * and decrement (-- and ++) operate on integer or floating-point
475 * values (including vectors and matrices). All unary operators work
476 * component-wise on their operands. These result with the same type
479 if (!type
->is_numeric()) {
480 _mesa_glsl_error(loc
, state
,
481 "operands to arithmetic operators must be numeric");
482 return glsl_type::error_type
;
489 * \brief Return the result type of a bit-logic operation.
491 * If the given types to the bit-logic operator are invalid, return
492 * glsl_type::error_type.
494 * \param value_a LHS of bit-logic op
495 * \param value_b RHS of bit-logic op
497 static const struct glsl_type
*
498 bit_logic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
500 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
502 const glsl_type
*type_a
= value_a
->type
;
503 const glsl_type
*type_b
= value_b
->type
;
505 if (!state
->check_bitwise_operations_allowed(loc
)) {
506 return glsl_type::error_type
;
509 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
511 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
512 * (|). The operands must be of type signed or unsigned integers or
515 if (!type_a
->is_integer()) {
516 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
517 ast_expression::operator_string(op
));
518 return glsl_type::error_type
;
520 if (!type_b
->is_integer()) {
521 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
522 ast_expression::operator_string(op
));
523 return glsl_type::error_type
;
526 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
527 * make sense for bitwise operations, as they don't operate on floats.
529 * GLSL 4.0 added implicit int -> uint conversions, which are relevant
530 * here. It wasn't clear whether or not we should apply them to bitwise
531 * operations. However, Khronos has decided that they should in future
532 * language revisions. Applications also rely on this behavior. We opt
533 * to apply them in general, but issue a portability warning.
535 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
537 if (type_a
->base_type
!= type_b
->base_type
) {
538 if (!apply_implicit_conversion(type_a
, value_b
, state
)
539 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
540 _mesa_glsl_error(loc
, state
,
541 "could not implicitly convert operands to "
543 ast_expression::operator_string(op
));
544 return glsl_type::error_type
;
546 _mesa_glsl_warning(loc
, state
,
547 "some implementations may not support implicit "
548 "int -> uint conversions for `%s' operators; "
549 "consider casting explicitly for portability",
550 ast_expression::operator_string(op
));
552 type_a
= value_a
->type
;
553 type_b
= value_b
->type
;
556 /* "The fundamental types of the operands (signed or unsigned) must
559 if (type_a
->base_type
!= type_b
->base_type
) {
560 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
561 "base type", ast_expression::operator_string(op
));
562 return glsl_type::error_type
;
565 /* "The operands cannot be vectors of differing size." */
566 if (type_a
->is_vector() &&
567 type_b
->is_vector() &&
568 type_a
->vector_elements
!= type_b
->vector_elements
) {
569 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
570 "different sizes", ast_expression::operator_string(op
));
571 return glsl_type::error_type
;
574 /* "If one operand is a scalar and the other a vector, the scalar is
575 * applied component-wise to the vector, resulting in the same type as
576 * the vector. The fundamental types of the operands [...] will be the
577 * resulting fundamental type."
579 if (type_a
->is_scalar())
585 static const struct glsl_type
*
586 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
587 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
589 const glsl_type
*type_a
= value_a
->type
;
590 const glsl_type
*type_b
= value_b
->type
;
592 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
593 return glsl_type::error_type
;
596 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
598 * "The operator modulus (%) operates on signed or unsigned integers or
601 if (!type_a
->is_integer()) {
602 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
603 return glsl_type::error_type
;
605 if (!type_b
->is_integer()) {
606 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
607 return glsl_type::error_type
;
610 /* "If the fundamental types in the operands do not match, then the
611 * conversions from section 4.1.10 "Implicit Conversions" are applied
612 * to create matching types."
614 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
615 * int -> uint conversion rules. Prior to that, there were no implicit
616 * conversions. So it's harmless to apply them universally - no implicit
617 * conversions will exist. If the types don't match, we'll receive false,
618 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
620 * "The operand types must both be signed or unsigned."
622 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
623 !apply_implicit_conversion(type_b
, value_a
, state
)) {
624 _mesa_glsl_error(loc
, state
,
625 "could not implicitly convert operands to "
626 "modulus (%%) operator");
627 return glsl_type::error_type
;
629 type_a
= value_a
->type
;
630 type_b
= value_b
->type
;
632 /* "The operands cannot be vectors of differing size. If one operand is
633 * a scalar and the other vector, then the scalar is applied component-
634 * wise to the vector, resulting in the same type as the vector. If both
635 * are vectors of the same size, the result is computed component-wise."
637 if (type_a
->is_vector()) {
638 if (!type_b
->is_vector()
639 || (type_a
->vector_elements
== type_b
->vector_elements
))
644 /* "The operator modulus (%) is not defined for any other data types
645 * (non-integer types)."
647 _mesa_glsl_error(loc
, state
, "type mismatch");
648 return glsl_type::error_type
;
652 static const struct glsl_type
*
653 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
654 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
656 const glsl_type
*type_a
= value_a
->type
;
657 const glsl_type
*type_b
= value_b
->type
;
659 /* From GLSL 1.50 spec, page 56:
660 * "The relational operators greater than (>), less than (<), greater
661 * than or equal (>=), and less than or equal (<=) operate only on
662 * scalar integer and scalar floating-point expressions."
664 if (!type_a
->is_numeric()
665 || !type_b
->is_numeric()
666 || !type_a
->is_scalar()
667 || !type_b
->is_scalar()) {
668 _mesa_glsl_error(loc
, state
,
669 "operands to relational operators must be scalar and "
671 return glsl_type::error_type
;
674 /* "Either the operands' types must match, or the conversions from
675 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
676 * operand, after which the types must match."
678 if (!apply_implicit_conversion(type_a
, value_b
, state
)
679 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
680 _mesa_glsl_error(loc
, state
,
681 "could not implicitly convert operands to "
682 "relational operator");
683 return glsl_type::error_type
;
685 type_a
= value_a
->type
;
686 type_b
= value_b
->type
;
688 if (type_a
->base_type
!= type_b
->base_type
) {
689 _mesa_glsl_error(loc
, state
, "base type mismatch");
690 return glsl_type::error_type
;
693 /* "The result is scalar Boolean."
695 return glsl_type::bool_type
;
699 * \brief Return the result type of a bit-shift operation.
701 * If the given types to the bit-shift operator are invalid, return
702 * glsl_type::error_type.
704 * \param type_a Type of LHS of bit-shift op
705 * \param type_b Type of RHS of bit-shift op
707 static const struct glsl_type
*
708 shift_result_type(const struct glsl_type
*type_a
,
709 const struct glsl_type
*type_b
,
711 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
713 if (!state
->check_bitwise_operations_allowed(loc
)) {
714 return glsl_type::error_type
;
717 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
719 * "The shift operators (<<) and (>>). For both operators, the operands
720 * must be signed or unsigned integers or integer vectors. One operand
721 * can be signed while the other is unsigned."
723 if (!type_a
->is_integer()) {
724 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
725 "integer vector", ast_expression::operator_string(op
));
726 return glsl_type::error_type
;
729 if (!type_b
->is_integer()) {
730 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
731 "integer vector", ast_expression::operator_string(op
));
732 return glsl_type::error_type
;
735 /* "If the first operand is a scalar, the second operand has to be
738 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
739 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
740 "second must be scalar as well",
741 ast_expression::operator_string(op
));
742 return glsl_type::error_type
;
745 /* If both operands are vectors, check that they have same number of
748 if (type_a
->is_vector() &&
749 type_b
->is_vector() &&
750 type_a
->vector_elements
!= type_b
->vector_elements
) {
751 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
752 "have same number of elements",
753 ast_expression::operator_string(op
));
754 return glsl_type::error_type
;
757 /* "In all cases, the resulting type will be the same type as the left
764 * Returns the innermost array index expression in an rvalue tree.
765 * This is the largest indexing level -- if an array of blocks, then
766 * it is the block index rather than an indexing expression for an
767 * array-typed member of an array of blocks.
770 find_innermost_array_index(ir_rvalue
*rv
)
772 ir_dereference_array
*last
= NULL
;
774 if (rv
->as_dereference_array()) {
775 last
= rv
->as_dereference_array();
777 } else if (rv
->as_dereference_record())
778 rv
= rv
->as_dereference_record()->record
;
779 else if (rv
->as_swizzle())
780 rv
= rv
->as_swizzle()->val
;
786 return last
->array_index
;
792 * Validates that a value can be assigned to a location with a specified type
794 * Validates that \c rhs can be assigned to some location. If the types are
795 * not an exact match but an automatic conversion is possible, \c rhs will be
799 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
800 * Otherwise the actual RHS to be assigned will be returned. This may be
801 * \c rhs, or it may be \c rhs after some type conversion.
804 * In addition to being used for assignments, this function is used to
805 * type-check return values.
808 validate_assignment(struct _mesa_glsl_parse_state
*state
,
809 YYLTYPE loc
, ir_rvalue
*lhs
,
810 ir_rvalue
*rhs
, bool is_initializer
)
812 /* If there is already some error in the RHS, just return it. Anything
813 * else will lead to an avalanche of error message back to the user.
815 if (rhs
->type
->is_error())
818 /* In the Tessellation Control Shader:
819 * If a per-vertex output variable is used as an l-value, it is an error
820 * if the expression indicating the vertex number is not the identifier
823 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
824 ir_variable
*var
= lhs
->variable_referenced();
825 if (var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
826 ir_rvalue
*index
= find_innermost_array_index(lhs
);
827 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
828 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
829 _mesa_glsl_error(&loc
, state
,
830 "Tessellation control shader outputs can only "
831 "be indexed by gl_InvocationID");
837 /* If the types are identical, the assignment can trivially proceed.
839 if (rhs
->type
== lhs
->type
)
842 /* If the array element types are the same and the LHS is unsized,
843 * the assignment is okay for initializers embedded in variable
846 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
847 * is handled by ir_dereference::is_lvalue.
849 const glsl_type
*lhs_t
= lhs
->type
;
850 const glsl_type
*rhs_t
= rhs
->type
;
851 bool unsized_array
= false;
852 while(lhs_t
->is_array()) {
854 break; /* the rest of the inner arrays match so break out early */
855 if (!rhs_t
->is_array()) {
856 unsized_array
= false;
857 break; /* number of dimensions mismatch */
859 if (lhs_t
->length
== rhs_t
->length
) {
860 lhs_t
= lhs_t
->fields
.array
;
861 rhs_t
= rhs_t
->fields
.array
;
863 } else if (lhs_t
->is_unsized_array()) {
864 unsized_array
= true;
866 unsized_array
= false;
867 break; /* sized array mismatch */
869 lhs_t
= lhs_t
->fields
.array
;
870 rhs_t
= rhs_t
->fields
.array
;
873 if (is_initializer
) {
876 _mesa_glsl_error(&loc
, state
,
877 "implicitly sized arrays cannot be assigned");
882 /* Check for implicit conversion in GLSL 1.20 */
883 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
884 if (rhs
->type
== lhs
->type
)
888 _mesa_glsl_error(&loc
, state
,
889 "%s of type %s cannot be assigned to "
890 "variable of type %s",
891 is_initializer
? "initializer" : "value",
892 rhs
->type
->name
, lhs
->type
->name
);
898 mark_whole_array_access(ir_rvalue
*access
)
900 ir_dereference_variable
*deref
= access
->as_dereference_variable();
902 if (deref
&& deref
->var
) {
903 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
908 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
909 const char *non_lvalue_description
,
910 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
911 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
916 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
918 ir_variable
*lhs_var
= lhs
->variable_referenced();
920 lhs_var
->data
.assigned
= true;
922 if (!error_emitted
) {
923 if (non_lvalue_description
!= NULL
) {
924 _mesa_glsl_error(&lhs_loc
, state
,
926 non_lvalue_description
);
927 error_emitted
= true;
928 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
929 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
930 lhs_var
->data
.image_read_only
))) {
931 /* We can have image_read_only set on both images and buffer variables,
932 * but in the former there is a distinction between assignments to
933 * the variable itself (read_only) and to the memory they point to
934 * (image_read_only), while in the case of buffer variables there is
935 * no such distinction, that is why this check here is limited to
936 * buffer variables alone.
938 _mesa_glsl_error(&lhs_loc
, state
,
939 "assignment to read-only variable '%s'",
941 error_emitted
= true;
942 } else if (lhs
->type
->is_array() &&
943 !state
->check_version(120, 300, &lhs_loc
,
944 "whole array assignment forbidden")) {
945 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
947 * "Other binary or unary expressions, non-dereferenced
948 * arrays, function names, swizzles with repeated fields,
949 * and constants cannot be l-values."
951 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
953 error_emitted
= true;
954 } else if (!lhs
->is_lvalue()) {
955 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
956 error_emitted
= true;
961 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
962 if (new_rhs
!= NULL
) {
965 /* If the LHS array was not declared with a size, it takes it size from
966 * the RHS. If the LHS is an l-value and a whole array, it must be a
967 * dereference of a variable. Any other case would require that the LHS
968 * is either not an l-value or not a whole array.
970 if (lhs
->type
->is_unsized_array()) {
971 ir_dereference
*const d
= lhs
->as_dereference();
975 ir_variable
*const var
= d
->variable_referenced();
979 if (var
->data
.max_array_access
>= unsigned(rhs
->type
->array_size())) {
980 /* FINISHME: This should actually log the location of the RHS. */
981 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
983 var
->data
.max_array_access
);
986 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
987 rhs
->type
->array_size());
990 if (lhs
->type
->is_array()) {
991 mark_whole_array_access(rhs
);
992 mark_whole_array_access(lhs
);
996 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
997 * but not post_inc) need the converted assigned value as an rvalue
998 * to handle things like:
1003 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1005 instructions
->push_tail(var
);
1006 instructions
->push_tail(assign(var
, rhs
));
1008 if (!error_emitted
) {
1009 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
1010 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1012 ir_rvalue
*rvalue
= new(ctx
) ir_dereference_variable(var
);
1014 *out_rvalue
= rvalue
;
1017 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1021 return error_emitted
;
1025 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1027 void *ctx
= ralloc_parent(lvalue
);
1030 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1032 instructions
->push_tail(var
);
1034 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1037 return new(ctx
) ir_dereference_variable(var
);
1042 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1044 (void) instructions
;
1051 ast_node::has_sequence_subexpression() const
1057 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1058 struct _mesa_glsl_parse_state
*state
)
1060 (void)hir(instructions
, state
);
1064 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1065 struct _mesa_glsl_parse_state
*state
)
1067 (void)hir(instructions
, state
);
1071 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1074 ir_rvalue
*cmp
= NULL
;
1076 if (operation
== ir_binop_all_equal
)
1077 join_op
= ir_binop_logic_and
;
1079 join_op
= ir_binop_logic_or
;
1081 switch (op0
->type
->base_type
) {
1082 case GLSL_TYPE_FLOAT
:
1083 case GLSL_TYPE_UINT
:
1085 case GLSL_TYPE_BOOL
:
1086 case GLSL_TYPE_DOUBLE
:
1087 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1089 case GLSL_TYPE_ARRAY
: {
1090 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1091 ir_rvalue
*e0
, *e1
, *result
;
1093 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1094 new(mem_ctx
) ir_constant(i
));
1095 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1096 new(mem_ctx
) ir_constant(i
));
1097 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1100 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1106 mark_whole_array_access(op0
);
1107 mark_whole_array_access(op1
);
1111 case GLSL_TYPE_STRUCT
: {
1112 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1113 ir_rvalue
*e0
, *e1
, *result
;
1114 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1116 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1118 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1120 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1123 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1131 case GLSL_TYPE_ERROR
:
1132 case GLSL_TYPE_VOID
:
1133 case GLSL_TYPE_SAMPLER
:
1134 case GLSL_TYPE_IMAGE
:
1135 case GLSL_TYPE_INTERFACE
:
1136 case GLSL_TYPE_FUNCTION
:
1137 case GLSL_TYPE_ATOMIC_UINT
:
1138 case GLSL_TYPE_SUBROUTINE
:
1139 /* I assume a comparison of a struct containing a sampler just
1140 * ignores the sampler present in the type.
1146 cmp
= new(mem_ctx
) ir_constant(true);
1151 /* For logical operations, we want to ensure that the operands are
1152 * scalar booleans. If it isn't, emit an error and return a constant
1153 * boolean to avoid triggering cascading error messages.
1156 get_scalar_boolean_operand(exec_list
*instructions
,
1157 struct _mesa_glsl_parse_state
*state
,
1158 ast_expression
*parent_expr
,
1160 const char *operand_name
,
1161 bool *error_emitted
)
1163 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1165 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1167 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1170 if (!*error_emitted
) {
1171 YYLTYPE loc
= expr
->get_location();
1172 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1174 parent_expr
->operator_string(parent_expr
->oper
));
1175 *error_emitted
= true;
1178 return new(ctx
) ir_constant(true);
1182 * If name refers to a builtin array whose maximum allowed size is less than
1183 * size, report an error and return true. Otherwise return false.
1186 check_builtin_array_max_size(const char *name
, unsigned size
,
1187 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1189 if ((strcmp("gl_TexCoord", name
) == 0)
1190 && (size
> state
->Const
.MaxTextureCoords
)) {
1191 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1193 * "The size [of gl_TexCoord] can be at most
1194 * gl_MaxTextureCoords."
1196 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1197 "be larger than gl_MaxTextureCoords (%u)",
1198 state
->Const
.MaxTextureCoords
);
1199 } else if (strcmp("gl_ClipDistance", name
) == 0
1200 && size
> state
->Const
.MaxClipPlanes
) {
1201 /* From section 7.1 (Vertex Shader Special Variables) of the
1204 * "The gl_ClipDistance array is predeclared as unsized and
1205 * must be sized by the shader either redeclaring it with a
1206 * size or indexing it only with integral constant
1207 * expressions. ... The size can be at most
1208 * gl_MaxClipDistances."
1210 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1211 "be larger than gl_MaxClipDistances (%u)",
1212 state
->Const
.MaxClipPlanes
);
1217 * Create the constant 1, of a which is appropriate for incrementing and
1218 * decrementing values of the given GLSL type. For example, if type is vec4,
1219 * this creates a constant value of 1.0 having type float.
1221 * If the given type is invalid for increment and decrement operators, return
1222 * a floating point 1--the error will be detected later.
1225 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1227 switch (type
->base_type
) {
1228 case GLSL_TYPE_UINT
:
1229 return new(ctx
) ir_constant((unsigned) 1);
1231 return new(ctx
) ir_constant(1);
1233 case GLSL_TYPE_FLOAT
:
1234 return new(ctx
) ir_constant(1.0f
);
1239 ast_expression::hir(exec_list
*instructions
,
1240 struct _mesa_glsl_parse_state
*state
)
1242 return do_hir(instructions
, state
, true);
1246 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1247 struct _mesa_glsl_parse_state
*state
)
1249 do_hir(instructions
, state
, false);
1253 ast_expression::do_hir(exec_list
*instructions
,
1254 struct _mesa_glsl_parse_state
*state
,
1258 static const int operations
[AST_NUM_OPERATORS
] = {
1259 -1, /* ast_assign doesn't convert to ir_expression. */
1260 -1, /* ast_plus doesn't convert to ir_expression. */
1274 ir_binop_any_nequal
,
1284 /* Note: The following block of expression types actually convert
1285 * to multiple IR instructions.
1287 ir_binop_mul
, /* ast_mul_assign */
1288 ir_binop_div
, /* ast_div_assign */
1289 ir_binop_mod
, /* ast_mod_assign */
1290 ir_binop_add
, /* ast_add_assign */
1291 ir_binop_sub
, /* ast_sub_assign */
1292 ir_binop_lshift
, /* ast_ls_assign */
1293 ir_binop_rshift
, /* ast_rs_assign */
1294 ir_binop_bit_and
, /* ast_and_assign */
1295 ir_binop_bit_xor
, /* ast_xor_assign */
1296 ir_binop_bit_or
, /* ast_or_assign */
1298 -1, /* ast_conditional doesn't convert to ir_expression. */
1299 ir_binop_add
, /* ast_pre_inc. */
1300 ir_binop_sub
, /* ast_pre_dec. */
1301 ir_binop_add
, /* ast_post_inc. */
1302 ir_binop_sub
, /* ast_post_dec. */
1303 -1, /* ast_field_selection doesn't conv to ir_expression. */
1304 -1, /* ast_array_index doesn't convert to ir_expression. */
1305 -1, /* ast_function_call doesn't conv to ir_expression. */
1306 -1, /* ast_identifier doesn't convert to ir_expression. */
1307 -1, /* ast_int_constant doesn't convert to ir_expression. */
1308 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1309 -1, /* ast_float_constant doesn't conv to ir_expression. */
1310 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1311 -1, /* ast_sequence doesn't convert to ir_expression. */
1313 ir_rvalue
*result
= NULL
;
1315 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1316 bool error_emitted
= false;
1319 loc
= this->get_location();
1321 switch (this->oper
) {
1323 assert(!"ast_aggregate: Should never get here.");
1327 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1328 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1331 do_assignment(instructions
, state
,
1332 this->subexpressions
[0]->non_lvalue_description
,
1333 op
[0], op
[1], &result
, needs_rvalue
, false,
1334 this->subexpressions
[0]->get_location());
1339 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1341 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1343 error_emitted
= type
->is_error();
1349 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1351 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1353 error_emitted
= type
->is_error();
1355 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1363 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1364 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1366 type
= arithmetic_result_type(op
[0], op
[1],
1367 (this->oper
== ast_mul
),
1369 error_emitted
= type
->is_error();
1371 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1376 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1377 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1379 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1381 assert(operations
[this->oper
] == ir_binop_mod
);
1383 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1385 error_emitted
= type
->is_error();
1390 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1391 error_emitted
= true;
1394 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1395 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1396 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1398 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1400 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1407 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1408 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1410 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1412 /* The relational operators must either generate an error or result
1413 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1415 assert(type
->is_error()
1416 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1417 && type
->is_scalar()));
1419 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1421 error_emitted
= type
->is_error();
1426 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1427 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1429 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1431 * "The equality operators equal (==), and not equal (!=)
1432 * operate on all types. They result in a scalar Boolean. If
1433 * the operand types do not match, then there must be a
1434 * conversion from Section 4.1.10 "Implicit Conversions"
1435 * applied to one operand that can make them match, in which
1436 * case this conversion is done."
1439 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1440 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1441 "no operation `%1$s' exists that takes a left-hand "
1442 "operand of type 'void' or a right operand of type "
1443 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1444 error_emitted
= true;
1445 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1446 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1447 || (op
[0]->type
!= op
[1]->type
)) {
1448 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1449 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1450 error_emitted
= true;
1451 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1452 !state
->check_version(120, 300, &loc
,
1453 "array comparisons forbidden")) {
1454 error_emitted
= true;
1455 } else if ((op
[0]->type
->contains_opaque() ||
1456 op
[1]->type
->contains_opaque())) {
1457 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1458 error_emitted
= true;
1461 if (error_emitted
) {
1462 result
= new(ctx
) ir_constant(false);
1464 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1465 assert(result
->type
== glsl_type::bool_type
);
1472 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1473 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1474 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1475 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1477 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1481 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1483 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1484 error_emitted
= true;
1487 if (!op
[0]->type
->is_integer()) {
1488 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1489 error_emitted
= true;
1492 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1493 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1496 case ast_logic_and
: {
1497 exec_list rhs_instructions
;
1498 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1499 "LHS", &error_emitted
);
1500 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1501 "RHS", &error_emitted
);
1503 if (rhs_instructions
.is_empty()) {
1504 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1505 type
= result
->type
;
1507 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1510 instructions
->push_tail(tmp
);
1512 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1513 instructions
->push_tail(stmt
);
1515 stmt
->then_instructions
.append_list(&rhs_instructions
);
1516 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1517 ir_assignment
*const then_assign
=
1518 new(ctx
) ir_assignment(then_deref
, op
[1]);
1519 stmt
->then_instructions
.push_tail(then_assign
);
1521 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1522 ir_assignment
*const else_assign
=
1523 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1524 stmt
->else_instructions
.push_tail(else_assign
);
1526 result
= new(ctx
) ir_dereference_variable(tmp
);
1532 case ast_logic_or
: {
1533 exec_list rhs_instructions
;
1534 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1535 "LHS", &error_emitted
);
1536 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1537 "RHS", &error_emitted
);
1539 if (rhs_instructions
.is_empty()) {
1540 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1541 type
= result
->type
;
1543 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1546 instructions
->push_tail(tmp
);
1548 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1549 instructions
->push_tail(stmt
);
1551 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1552 ir_assignment
*const then_assign
=
1553 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1554 stmt
->then_instructions
.push_tail(then_assign
);
1556 stmt
->else_instructions
.append_list(&rhs_instructions
);
1557 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1558 ir_assignment
*const else_assign
=
1559 new(ctx
) ir_assignment(else_deref
, op
[1]);
1560 stmt
->else_instructions
.push_tail(else_assign
);
1562 result
= new(ctx
) ir_dereference_variable(tmp
);
1569 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1571 * "The logical binary operators and (&&), or ( | | ), and
1572 * exclusive or (^^). They operate only on two Boolean
1573 * expressions and result in a Boolean expression."
1575 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1577 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1580 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1585 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1586 "operand", &error_emitted
);
1588 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1592 case ast_mul_assign
:
1593 case ast_div_assign
:
1594 case ast_add_assign
:
1595 case ast_sub_assign
: {
1596 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1597 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1599 type
= arithmetic_result_type(op
[0], op
[1],
1600 (this->oper
== ast_mul_assign
),
1603 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1607 do_assignment(instructions
, state
,
1608 this->subexpressions
[0]->non_lvalue_description
,
1609 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1610 &result
, needs_rvalue
, false,
1611 this->subexpressions
[0]->get_location());
1613 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1614 * explicitly test for this because none of the binary expression
1615 * operators allow array operands either.
1621 case ast_mod_assign
: {
1622 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1623 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1625 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1627 assert(operations
[this->oper
] == ir_binop_mod
);
1629 ir_rvalue
*temp_rhs
;
1630 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1634 do_assignment(instructions
, state
,
1635 this->subexpressions
[0]->non_lvalue_description
,
1636 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1637 &result
, needs_rvalue
, false,
1638 this->subexpressions
[0]->get_location());
1643 case ast_rs_assign
: {
1644 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1645 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1646 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1648 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1649 type
, op
[0], op
[1]);
1651 do_assignment(instructions
, state
,
1652 this->subexpressions
[0]->non_lvalue_description
,
1653 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1654 &result
, needs_rvalue
, false,
1655 this->subexpressions
[0]->get_location());
1659 case ast_and_assign
:
1660 case ast_xor_assign
:
1661 case ast_or_assign
: {
1662 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1663 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1664 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1665 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1666 type
, op
[0], op
[1]);
1668 do_assignment(instructions
, state
,
1669 this->subexpressions
[0]->non_lvalue_description
,
1670 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1671 &result
, needs_rvalue
, false,
1672 this->subexpressions
[0]->get_location());
1676 case ast_conditional
: {
1677 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1679 * "The ternary selection operator (?:). It operates on three
1680 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1681 * first expression, which must result in a scalar Boolean."
1683 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1684 "condition", &error_emitted
);
1686 /* The :? operator is implemented by generating an anonymous temporary
1687 * followed by an if-statement. The last instruction in each branch of
1688 * the if-statement assigns a value to the anonymous temporary. This
1689 * temporary is the r-value of the expression.
1691 exec_list then_instructions
;
1692 exec_list else_instructions
;
1694 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1695 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1697 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1699 * "The second and third expressions can be any type, as
1700 * long their types match, or there is a conversion in
1701 * Section 4.1.10 "Implicit Conversions" that can be applied
1702 * to one of the expressions to make their types match. This
1703 * resulting matching type is the type of the entire
1706 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1707 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1708 || (op
[1]->type
!= op
[2]->type
)) {
1709 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1711 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1712 "operator must have matching types");
1713 error_emitted
= true;
1714 type
= glsl_type::error_type
;
1719 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1721 * "The second and third expressions must be the same type, but can
1722 * be of any type other than an array."
1724 if (type
->is_array() &&
1725 !state
->check_version(120, 300, &loc
,
1726 "second and third operands of ?: operator "
1727 "cannot be arrays")) {
1728 error_emitted
= true;
1731 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1733 * "Except for array indexing, structure member selection, and
1734 * parentheses, opaque variables are not allowed to be operands in
1735 * expressions; such use results in a compile-time error."
1737 if (type
->contains_opaque()) {
1738 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1739 "of the ?: operator");
1740 error_emitted
= true;
1743 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1745 if (then_instructions
.is_empty()
1746 && else_instructions
.is_empty()
1747 && cond_val
!= NULL
) {
1748 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1750 /* The copy to conditional_tmp reads the whole array. */
1751 if (type
->is_array()) {
1752 mark_whole_array_access(op
[1]);
1753 mark_whole_array_access(op
[2]);
1756 ir_variable
*const tmp
=
1757 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1758 instructions
->push_tail(tmp
);
1760 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1761 instructions
->push_tail(stmt
);
1763 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1764 ir_dereference
*const then_deref
=
1765 new(ctx
) ir_dereference_variable(tmp
);
1766 ir_assignment
*const then_assign
=
1767 new(ctx
) ir_assignment(then_deref
, op
[1]);
1768 stmt
->then_instructions
.push_tail(then_assign
);
1770 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1771 ir_dereference
*const else_deref
=
1772 new(ctx
) ir_dereference_variable(tmp
);
1773 ir_assignment
*const else_assign
=
1774 new(ctx
) ir_assignment(else_deref
, op
[2]);
1775 stmt
->else_instructions
.push_tail(else_assign
);
1777 result
= new(ctx
) ir_dereference_variable(tmp
);
1784 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1785 ? "pre-increment operation" : "pre-decrement operation";
1787 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1788 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1790 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1792 ir_rvalue
*temp_rhs
;
1793 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1797 do_assignment(instructions
, state
,
1798 this->subexpressions
[0]->non_lvalue_description
,
1799 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1800 &result
, needs_rvalue
, false,
1801 this->subexpressions
[0]->get_location());
1806 case ast_post_dec
: {
1807 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1808 ? "post-increment operation" : "post-decrement operation";
1809 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1810 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1812 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1814 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1816 ir_rvalue
*temp_rhs
;
1817 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1820 /* Get a temporary of a copy of the lvalue before it's modified.
1821 * This may get thrown away later.
1823 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1825 ir_rvalue
*junk_rvalue
;
1827 do_assignment(instructions
, state
,
1828 this->subexpressions
[0]->non_lvalue_description
,
1829 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1830 &junk_rvalue
, false, false,
1831 this->subexpressions
[0]->get_location());
1836 case ast_field_selection
:
1837 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1840 case ast_array_index
: {
1841 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1843 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1844 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1846 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1849 if (result
->type
->is_error())
1850 error_emitted
= true;
1855 case ast_unsized_array_dim
:
1856 assert(!"ast_unsized_array_dim: Should never get here.");
1859 case ast_function_call
:
1860 /* Should *NEVER* get here. ast_function_call should always be handled
1861 * by ast_function_expression::hir.
1866 case ast_identifier
: {
1867 /* ast_identifier can appear several places in a full abstract syntax
1868 * tree. This particular use must be at location specified in the grammar
1869 * as 'variable_identifier'.
1872 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1875 var
->data
.used
= true;
1876 result
= new(ctx
) ir_dereference_variable(var
);
1878 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1879 this->primary_expression
.identifier
);
1881 result
= ir_rvalue::error_value(ctx
);
1882 error_emitted
= true;
1887 case ast_int_constant
:
1888 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1891 case ast_uint_constant
:
1892 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1895 case ast_float_constant
:
1896 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1899 case ast_bool_constant
:
1900 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1903 case ast_double_constant
:
1904 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1907 case ast_sequence
: {
1908 /* It should not be possible to generate a sequence in the AST without
1909 * any expressions in it.
1911 assert(!this->expressions
.is_empty());
1913 /* The r-value of a sequence is the last expression in the sequence. If
1914 * the other expressions in the sequence do not have side-effects (and
1915 * therefore add instructions to the instruction list), they get dropped
1918 exec_node
*previous_tail_pred
= NULL
;
1919 YYLTYPE previous_operand_loc
= loc
;
1921 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1922 /* If one of the operands of comma operator does not generate any
1923 * code, we want to emit a warning. At each pass through the loop
1924 * previous_tail_pred will point to the last instruction in the
1925 * stream *before* processing the previous operand. Naturally,
1926 * instructions->tail_pred will point to the last instruction in the
1927 * stream *after* processing the previous operand. If the two
1928 * pointers match, then the previous operand had no effect.
1930 * The warning behavior here differs slightly from GCC. GCC will
1931 * only emit a warning if none of the left-hand operands have an
1932 * effect. However, it will emit a warning for each. I believe that
1933 * there are some cases in C (especially with GCC extensions) where
1934 * it is useful to have an intermediate step in a sequence have no
1935 * effect, but I don't think these cases exist in GLSL. Either way,
1936 * it would be a giant hassle to replicate that behavior.
1938 if (previous_tail_pred
== instructions
->tail_pred
) {
1939 _mesa_glsl_warning(&previous_operand_loc
, state
,
1940 "left-hand operand of comma expression has "
1944 /* tail_pred is directly accessed instead of using the get_tail()
1945 * method for performance reasons. get_tail() has extra code to
1946 * return NULL when the list is empty. We don't care about that
1947 * here, so using tail_pred directly is fine.
1949 previous_tail_pred
= instructions
->tail_pred
;
1950 previous_operand_loc
= ast
->get_location();
1952 result
= ast
->hir(instructions
, state
);
1955 /* Any errors should have already been emitted in the loop above.
1957 error_emitted
= true;
1961 type
= NULL
; /* use result->type, not type. */
1962 assert(result
!= NULL
|| !needs_rvalue
);
1964 if (result
&& result
->type
->is_error() && !error_emitted
)
1965 _mesa_glsl_error(& loc
, state
, "type mismatch");
1971 ast_expression::has_sequence_subexpression() const
1973 switch (this->oper
) {
1982 return this->subexpressions
[0]->has_sequence_subexpression();
2004 case ast_array_index
:
2005 case ast_mul_assign
:
2006 case ast_div_assign
:
2007 case ast_add_assign
:
2008 case ast_sub_assign
:
2009 case ast_mod_assign
:
2012 case ast_and_assign
:
2013 case ast_xor_assign
:
2015 return this->subexpressions
[0]->has_sequence_subexpression() ||
2016 this->subexpressions
[1]->has_sequence_subexpression();
2018 case ast_conditional
:
2019 return this->subexpressions
[0]->has_sequence_subexpression() ||
2020 this->subexpressions
[1]->has_sequence_subexpression() ||
2021 this->subexpressions
[2]->has_sequence_subexpression();
2026 case ast_field_selection
:
2027 case ast_identifier
:
2028 case ast_int_constant
:
2029 case ast_uint_constant
:
2030 case ast_float_constant
:
2031 case ast_bool_constant
:
2032 case ast_double_constant
:
2036 unreachable("ast_aggregate: Should never get here.");
2038 case ast_function_call
:
2039 unreachable("should be handled by ast_function_expression::hir");
2041 case ast_unsized_array_dim
:
2042 unreachable("ast_unsized_array_dim: Should never get here.");
2049 ast_expression_statement::hir(exec_list
*instructions
,
2050 struct _mesa_glsl_parse_state
*state
)
2052 /* It is possible to have expression statements that don't have an
2053 * expression. This is the solitary semicolon:
2055 * for (i = 0; i < 5; i++)
2058 * In this case the expression will be NULL. Test for NULL and don't do
2059 * anything in that case.
2061 if (expression
!= NULL
)
2062 expression
->hir_no_rvalue(instructions
, state
);
2064 /* Statements do not have r-values.
2071 ast_compound_statement::hir(exec_list
*instructions
,
2072 struct _mesa_glsl_parse_state
*state
)
2075 state
->symbols
->push_scope();
2077 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2078 ast
->hir(instructions
, state
);
2081 state
->symbols
->pop_scope();
2083 /* Compound statements do not have r-values.
2089 * Evaluate the given exec_node (which should be an ast_node representing
2090 * a single array dimension) and return its integer value.
2093 process_array_size(exec_node
*node
,
2094 struct _mesa_glsl_parse_state
*state
)
2096 exec_list dummy_instructions
;
2098 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2101 * Dimensions other than the outermost dimension can by unsized if they
2102 * are immediately sized by a constructor or initializer.
2104 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2107 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2108 YYLTYPE loc
= array_size
->get_location();
2111 _mesa_glsl_error(& loc
, state
,
2112 "array size could not be resolved");
2116 if (!ir
->type
->is_integer()) {
2117 _mesa_glsl_error(& loc
, state
,
2118 "array size must be integer type");
2122 if (!ir
->type
->is_scalar()) {
2123 _mesa_glsl_error(& loc
, state
,
2124 "array size must be scalar type");
2128 ir_constant
*const size
= ir
->constant_expression_value();
2129 if (size
== NULL
|| array_size
->has_sequence_subexpression()) {
2130 _mesa_glsl_error(& loc
, state
, "array size must be a "
2131 "constant valued expression");
2135 if (size
->value
.i
[0] <= 0) {
2136 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2140 assert(size
->type
== ir
->type
);
2142 /* If the array size is const (and we've verified that
2143 * it is) then no instructions should have been emitted
2144 * when we converted it to HIR. If they were emitted,
2145 * then either the array size isn't const after all, or
2146 * we are emitting unnecessary instructions.
2148 assert(dummy_instructions
.is_empty());
2150 return size
->value
.u
[0];
2153 static const glsl_type
*
2154 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2155 ast_array_specifier
*array_specifier
,
2156 struct _mesa_glsl_parse_state
*state
)
2158 const glsl_type
*array_type
= base
;
2160 if (array_specifier
!= NULL
) {
2161 if (base
->is_array()) {
2163 /* From page 19 (page 25) of the GLSL 1.20 spec:
2165 * "Only one-dimensional arrays may be declared."
2167 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2168 return glsl_type::error_type
;
2172 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
2173 !node
->is_head_sentinel(); node
= node
->prev
) {
2174 unsigned array_size
= process_array_size(node
, state
);
2175 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2183 precision_qualifier_allowed(const glsl_type
*type
)
2185 /* Precision qualifiers apply to floating point, integer and opaque
2188 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2189 * "Any floating point or any integer declaration can have the type
2190 * preceded by one of these precision qualifiers [...] Literal
2191 * constants do not have precision qualifiers. Neither do Boolean
2194 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2197 * "Precision qualifiers are added for code portability with OpenGL
2198 * ES, not for functionality. They have the same syntax as in OpenGL
2201 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2203 * "uniform lowp sampler2D sampler;
2206 * lowp vec4 col = texture2D (sampler, coord);
2207 * // texture2D returns lowp"
2209 * From this, we infer that GLSL 1.30 (and later) should allow precision
2210 * qualifiers on sampler types just like float and integer types.
2212 return (type
->is_float()
2213 || type
->is_integer()
2214 || type
->contains_opaque())
2215 && !type
->without_array()->is_record();
2219 ast_type_specifier::glsl_type(const char **name
,
2220 struct _mesa_glsl_parse_state
*state
) const
2222 const struct glsl_type
*type
;
2224 type
= state
->symbols
->get_type(this->type_name
);
2225 *name
= this->type_name
;
2227 YYLTYPE loc
= this->get_location();
2228 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2234 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2236 * "The precision statement
2238 * precision precision-qualifier type;
2240 * can be used to establish a default precision qualifier. The type field can
2241 * be either int or float or any of the sampler types, (...) If type is float,
2242 * the directive applies to non-precision-qualified floating point type
2243 * (scalar, vector, and matrix) declarations. If type is int, the directive
2244 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2245 * and unsigned) declarations."
2247 * We use the symbol table to keep the values of the default precisions for
2248 * each 'type' in each scope and we use the 'type' string from the precision
2249 * statement as key in the symbol table. When we want to retrieve the default
2250 * precision associated with a given glsl_type we need to know the type string
2251 * associated with it. This is what this function returns.
2254 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2256 switch (type
->base_type
) {
2257 case GLSL_TYPE_FLOAT
:
2259 case GLSL_TYPE_UINT
:
2262 case GLSL_TYPE_ATOMIC_UINT
:
2263 return "atomic_uint";
2264 case GLSL_TYPE_IMAGE
:
2266 case GLSL_TYPE_SAMPLER
: {
2267 const unsigned type_idx
=
2268 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2269 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2270 assert(type_idx
< 4);
2271 switch (type
->sampler_type
) {
2272 case GLSL_TYPE_FLOAT
:
2273 switch (type
->sampler_dimensionality
) {
2274 case GLSL_SAMPLER_DIM_1D
: {
2275 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2276 static const char *const names
[4] = {
2277 "sampler1D", "sampler1DArray",
2278 "sampler1DShadow", "sampler1DArrayShadow"
2280 return names
[type_idx
];
2282 case GLSL_SAMPLER_DIM_2D
: {
2283 static const char *const names
[8] = {
2284 "sampler2D", "sampler2DArray",
2285 "sampler2DShadow", "sampler2DArrayShadow",
2286 "image2D", "image2DArray", NULL
, NULL
2288 return names
[offset
+ type_idx
];
2290 case GLSL_SAMPLER_DIM_3D
: {
2291 static const char *const names
[8] = {
2292 "sampler3D", NULL
, NULL
, NULL
,
2293 "image3D", NULL
, NULL
, NULL
2295 return names
[offset
+ type_idx
];
2297 case GLSL_SAMPLER_DIM_CUBE
: {
2298 static const char *const names
[8] = {
2299 "samplerCube", "samplerCubeArray",
2300 "samplerCubeShadow", "samplerCubeArrayShadow",
2301 "imageCube", NULL
, NULL
, NULL
2303 return names
[offset
+ type_idx
];
2305 case GLSL_SAMPLER_DIM_MS
: {
2306 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2307 static const char *const names
[4] = {
2308 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2310 return names
[type_idx
];
2312 case GLSL_SAMPLER_DIM_RECT
: {
2313 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2314 static const char *const names
[4] = {
2315 "samplerRect", NULL
, "samplerRectShadow", NULL
2317 return names
[type_idx
];
2319 case GLSL_SAMPLER_DIM_BUF
: {
2320 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2321 static const char *const names
[4] = {
2322 "samplerBuffer", NULL
, NULL
, NULL
2324 return names
[type_idx
];
2326 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2327 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2328 static const char *const names
[4] = {
2329 "samplerExternalOES", NULL
, NULL
, NULL
2331 return names
[type_idx
];
2334 unreachable("Unsupported sampler/image dimensionality");
2335 } /* sampler/image float dimensionality */
2338 switch (type
->sampler_dimensionality
) {
2339 case GLSL_SAMPLER_DIM_1D
: {
2340 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2341 static const char *const names
[4] = {
2342 "isampler1D", "isampler1DArray", NULL
, NULL
2344 return names
[type_idx
];
2346 case GLSL_SAMPLER_DIM_2D
: {
2347 static const char *const names
[8] = {
2348 "isampler2D", "isampler2DArray", NULL
, NULL
,
2349 "iimage2D", "iimage2DArray", NULL
, NULL
2351 return names
[offset
+ type_idx
];
2353 case GLSL_SAMPLER_DIM_3D
: {
2354 static const char *const names
[8] = {
2355 "isampler3D", NULL
, NULL
, NULL
,
2356 "iimage3D", NULL
, NULL
, NULL
2358 return names
[offset
+ type_idx
];
2360 case GLSL_SAMPLER_DIM_CUBE
: {
2361 static const char *const names
[8] = {
2362 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2363 "iimageCube", NULL
, NULL
, NULL
2365 return names
[offset
+ type_idx
];
2367 case GLSL_SAMPLER_DIM_MS
: {
2368 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2369 static const char *const names
[4] = {
2370 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2372 return names
[type_idx
];
2374 case GLSL_SAMPLER_DIM_RECT
: {
2375 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2376 static const char *const names
[4] = {
2377 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2379 return names
[type_idx
];
2381 case GLSL_SAMPLER_DIM_BUF
: {
2382 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2383 static const char *const names
[4] = {
2384 "isamplerBuffer", NULL
, NULL
, NULL
2386 return names
[type_idx
];
2389 unreachable("Unsupported isampler/iimage dimensionality");
2390 } /* sampler/image int dimensionality */
2392 case GLSL_TYPE_UINT
:
2393 switch (type
->sampler_dimensionality
) {
2394 case GLSL_SAMPLER_DIM_1D
: {
2395 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2396 static const char *const names
[4] = {
2397 "usampler1D", "usampler1DArray", NULL
, NULL
2399 return names
[type_idx
];
2401 case GLSL_SAMPLER_DIM_2D
: {
2402 static const char *const names
[8] = {
2403 "usampler2D", "usampler2DArray", NULL
, NULL
,
2404 "uimage2D", "uimage2DArray", NULL
, NULL
2406 return names
[offset
+ type_idx
];
2408 case GLSL_SAMPLER_DIM_3D
: {
2409 static const char *const names
[8] = {
2410 "usampler3D", NULL
, NULL
, NULL
,
2411 "uimage3D", NULL
, NULL
, NULL
2413 return names
[offset
+ type_idx
];
2415 case GLSL_SAMPLER_DIM_CUBE
: {
2416 static const char *const names
[8] = {
2417 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2418 "uimageCube", NULL
, NULL
, NULL
2420 return names
[offset
+ type_idx
];
2422 case GLSL_SAMPLER_DIM_MS
: {
2423 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2424 static const char *const names
[4] = {
2425 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2427 return names
[type_idx
];
2429 case GLSL_SAMPLER_DIM_RECT
: {
2430 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2431 static const char *const names
[4] = {
2432 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2434 return names
[type_idx
];
2436 case GLSL_SAMPLER_DIM_BUF
: {
2437 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2438 static const char *const names
[4] = {
2439 "usamplerBuffer", NULL
, NULL
, NULL
2441 return names
[type_idx
];
2444 unreachable("Unsupported usampler/uimage dimensionality");
2445 } /* sampler/image uint dimensionality */
2448 unreachable("Unsupported sampler/image type");
2449 } /* sampler/image type */
2451 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2454 unreachable("Unsupported type");
2459 select_gles_precision(unsigned qual_precision
,
2460 const glsl_type
*type
,
2461 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2463 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2464 * In GLES we take the precision from the type qualifier if present,
2465 * otherwise, if the type of the variable allows precision qualifiers at
2466 * all, we look for the default precision qualifier for that type in the
2469 assert(state
->es_shader
);
2471 unsigned precision
= GLSL_PRECISION_NONE
;
2472 if (qual_precision
) {
2473 precision
= qual_precision
;
2474 } else if (precision_qualifier_allowed(type
)) {
2475 const char *type_name
=
2476 get_type_name_for_precision_qualifier(type
->without_array());
2477 assert(type_name
!= NULL
);
2480 state
->symbols
->get_default_precision_qualifier(type_name
);
2481 if (precision
== ast_precision_none
) {
2482 _mesa_glsl_error(loc
, state
,
2483 "No precision specified in this scope for type `%s'",
2491 ast_fully_specified_type::glsl_type(const char **name
,
2492 struct _mesa_glsl_parse_state
*state
) const
2494 return this->specifier
->glsl_type(name
, state
);
2498 * Determine whether a toplevel variable declaration declares a varying. This
2499 * function operates by examining the variable's mode and the shader target,
2500 * so it correctly identifies linkage variables regardless of whether they are
2501 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2503 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2504 * this function will produce undefined results.
2507 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2510 case MESA_SHADER_VERTEX
:
2511 return var
->data
.mode
== ir_var_shader_out
;
2512 case MESA_SHADER_FRAGMENT
:
2513 return var
->data
.mode
== ir_var_shader_in
;
2515 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2521 * Matrix layout qualifiers are only allowed on certain types
2524 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2526 const glsl_type
*type
,
2529 if (var
&& !var
->is_in_buffer_block()) {
2530 /* Layout qualifiers may only apply to interface blocks and fields in
2533 _mesa_glsl_error(loc
, state
,
2534 "uniform block layout qualifiers row_major and "
2535 "column_major may not be applied to variables "
2536 "outside of uniform blocks");
2537 } else if (!type
->without_array()->is_matrix()) {
2538 /* The OpenGL ES 3.0 conformance tests did not originally allow
2539 * matrix layout qualifiers on non-matrices. However, the OpenGL
2540 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2541 * amended to specifically allow these layouts on all types. Emit
2542 * a warning so that people know their code may not be portable.
2544 _mesa_glsl_warning(loc
, state
,
2545 "uniform block layout qualifiers row_major and "
2546 "column_major applied to non-matrix types may "
2547 "be rejected by older compilers");
2552 process_qualifier_constant(struct _mesa_glsl_parse_state
*state
,
2554 const char *qual_indentifier
,
2555 ast_expression
*const_expression
,
2558 exec_list dummy_instructions
;
2560 if (const_expression
== NULL
) {
2565 ir_rvalue
*const ir
= const_expression
->hir(&dummy_instructions
, state
);
2567 ir_constant
*const const_int
= ir
->constant_expression_value();
2568 if (const_int
== NULL
|| !const_int
->type
->is_integer()) {
2569 _mesa_glsl_error(loc
, state
, "%s must be an integral constant "
2570 "expression", qual_indentifier
);
2574 if (const_int
->value
.i
[0] < 0) {
2575 _mesa_glsl_error(loc
, state
, "%s layout qualifier is invalid (%d < 0)",
2576 qual_indentifier
, const_int
->value
.u
[0]);
2580 /* If the location is const (and we've verified that
2581 * it is) then no instructions should have been emitted
2582 * when we converted it to HIR. If they were emitted,
2583 * then either the location isn't const after all, or
2584 * we are emitting unnecessary instructions.
2586 assert(dummy_instructions
.is_empty());
2588 *value
= const_int
->value
.u
[0];
2593 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2596 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2597 _mesa_glsl_error(loc
, state
,
2598 "invalid stream specified %d is larger than "
2599 "MAX_VERTEX_STREAMS - 1 (%d).",
2600 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2608 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2611 const glsl_type
*type
,
2612 const ast_type_qualifier
*qual
)
2614 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2615 _mesa_glsl_error(loc
, state
,
2616 "the \"binding\" qualifier only applies to uniforms and "
2617 "shader storage buffer objects");
2621 unsigned qual_binding
;
2622 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2627 const struct gl_context
*const ctx
= state
->ctx
;
2628 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2629 unsigned max_index
= qual_binding
+ elements
- 1;
2630 const glsl_type
*base_type
= type
->without_array();
2632 if (base_type
->is_interface()) {
2633 /* UBOs. From page 60 of the GLSL 4.20 specification:
2634 * "If the binding point for any uniform block instance is less than zero,
2635 * or greater than or equal to the implementation-dependent maximum
2636 * number of uniform buffer bindings, a compilation error will occur.
2637 * When the binding identifier is used with a uniform block instanced as
2638 * an array of size N, all elements of the array from binding through
2639 * binding + N – 1 must be within this range."
2641 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2643 if (qual
->flags
.q
.uniform
&&
2644 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2645 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2646 "the maximum number of UBO binding points (%d)",
2647 qual_binding
, elements
,
2648 ctx
->Const
.MaxUniformBufferBindings
);
2652 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2653 * "If the binding point for any uniform or shader storage block instance
2654 * is less than zero, or greater than or equal to the
2655 * implementation-dependent maximum number of uniform buffer bindings, a
2656 * compile-time error will occur. When the binding identifier is used
2657 * with a uniform or shader storage block instanced as an array of size
2658 * N, all elements of the array from binding through binding + N – 1 must
2659 * be within this range."
2661 if (qual
->flags
.q
.buffer
&&
2662 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2663 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2664 "the maximum number of SSBO binding points (%d)",
2665 qual_binding
, elements
,
2666 ctx
->Const
.MaxShaderStorageBufferBindings
);
2669 } else if (base_type
->is_sampler()) {
2670 /* Samplers. From page 63 of the GLSL 4.20 specification:
2671 * "If the binding is less than zero, or greater than or equal to the
2672 * implementation-dependent maximum supported number of units, a
2673 * compilation error will occur. When the binding identifier is used
2674 * with an array of size N, all elements of the array from binding
2675 * through binding + N - 1 must be within this range."
2677 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2679 if (max_index
>= limit
) {
2680 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2681 "exceeds the maximum number of texture image units "
2682 "(%u)", qual_binding
, elements
, limit
);
2686 } else if (base_type
->contains_atomic()) {
2687 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2688 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2689 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2690 " maximum number of atomic counter buffer bindings"
2691 "(%u)", qual_binding
,
2692 ctx
->Const
.MaxAtomicBufferBindings
);
2696 } else if ((state
->is_version(420, 310) ||
2697 state
->ARB_shading_language_420pack_enable
) &&
2698 base_type
->is_image()) {
2699 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2700 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2701 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2702 " maximum number of image units (%d)", max_index
,
2703 ctx
->Const
.MaxImageUnits
);
2708 _mesa_glsl_error(loc
, state
,
2709 "the \"binding\" qualifier only applies to uniform "
2710 "blocks, opaque variables, or arrays thereof");
2714 var
->data
.explicit_binding
= true;
2715 var
->data
.binding
= qual_binding
;
2721 static glsl_interp_qualifier
2722 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2723 ir_variable_mode mode
,
2724 struct _mesa_glsl_parse_state
*state
,
2727 glsl_interp_qualifier interpolation
;
2728 if (qual
->flags
.q
.flat
)
2729 interpolation
= INTERP_QUALIFIER_FLAT
;
2730 else if (qual
->flags
.q
.noperspective
)
2731 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2732 else if (qual
->flags
.q
.smooth
)
2733 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2735 interpolation
= INTERP_QUALIFIER_NONE
;
2737 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2738 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2739 _mesa_glsl_error(loc
, state
,
2740 "interpolation qualifier `%s' can only be applied to "
2741 "shader inputs or outputs.",
2742 interpolation_string(interpolation
));
2746 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2747 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2748 _mesa_glsl_error(loc
, state
,
2749 "interpolation qualifier `%s' cannot be applied to "
2750 "vertex shader inputs or fragment shader outputs",
2751 interpolation_string(interpolation
));
2755 return interpolation
;
2760 apply_explicit_location(const struct ast_type_qualifier
*qual
,
2762 struct _mesa_glsl_parse_state
*state
,
2767 unsigned qual_location
;
2768 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
2773 /* Checks for GL_ARB_explicit_uniform_location. */
2774 if (qual
->flags
.q
.uniform
) {
2775 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2778 const struct gl_context
*const ctx
= state
->ctx
;
2779 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
2781 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2782 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2783 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2784 ctx
->Const
.MaxUserAssignableUniformLocations
);
2788 var
->data
.explicit_location
= true;
2789 var
->data
.location
= qual_location
;
2793 /* Between GL_ARB_explicit_attrib_location an
2794 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2795 * stage can be assigned explicit locations. The checking here associates
2796 * the correct extension with the correct stage's input / output:
2800 * vertex explicit_loc sso
2801 * tess control sso sso
2804 * fragment sso explicit_loc
2806 switch (state
->stage
) {
2807 case MESA_SHADER_VERTEX
:
2808 if (var
->data
.mode
== ir_var_shader_in
) {
2809 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2815 if (var
->data
.mode
== ir_var_shader_out
) {
2816 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2825 case MESA_SHADER_TESS_CTRL
:
2826 case MESA_SHADER_TESS_EVAL
:
2827 case MESA_SHADER_GEOMETRY
:
2828 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2829 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2838 case MESA_SHADER_FRAGMENT
:
2839 if (var
->data
.mode
== ir_var_shader_in
) {
2840 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2846 if (var
->data
.mode
== ir_var_shader_out
) {
2847 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2856 case MESA_SHADER_COMPUTE
:
2857 _mesa_glsl_error(loc
, state
,
2858 "compute shader variables cannot be given "
2859 "explicit locations");
2864 _mesa_glsl_error(loc
, state
,
2865 "%s cannot be given an explicit location in %s shader",
2867 _mesa_shader_stage_to_string(state
->stage
));
2869 var
->data
.explicit_location
= true;
2871 switch (state
->stage
) {
2872 case MESA_SHADER_VERTEX
:
2873 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2874 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
2875 : (qual_location
+ VARYING_SLOT_VAR0
);
2878 case MESA_SHADER_TESS_CTRL
:
2879 case MESA_SHADER_TESS_EVAL
:
2880 case MESA_SHADER_GEOMETRY
:
2881 if (var
->data
.patch
)
2882 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
2884 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
2887 case MESA_SHADER_FRAGMENT
:
2888 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2889 ? (qual_location
+ FRAG_RESULT_DATA0
)
2890 : (qual_location
+ VARYING_SLOT_VAR0
);
2892 case MESA_SHADER_COMPUTE
:
2893 assert(!"Unexpected shader type");
2897 /* Check if index was set for the uniform instead of the function */
2898 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
2899 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
2900 "used with subroutine functions");
2904 unsigned qual_index
;
2905 if (qual
->flags
.q
.explicit_index
&&
2906 process_qualifier_constant(state
, loc
, "index", qual
->index
,
2908 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2909 * Layout Qualifiers):
2911 * "It is also a compile-time error if a fragment shader
2912 * sets a layout index to less than 0 or greater than 1."
2914 * Older specifications don't mandate a behavior; we take
2915 * this as a clarification and always generate the error.
2917 if (qual_index
> 1) {
2918 _mesa_glsl_error(loc
, state
,
2919 "explicit index may only be 0 or 1");
2921 var
->data
.explicit_index
= true;
2922 var
->data
.index
= qual_index
;
2929 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2931 struct _mesa_glsl_parse_state
*state
,
2934 const glsl_type
*base_type
= var
->type
->without_array();
2936 if (base_type
->is_image()) {
2937 if (var
->data
.mode
!= ir_var_uniform
&&
2938 var
->data
.mode
!= ir_var_function_in
) {
2939 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2940 "function parameters or uniform-qualified "
2941 "global variables");
2944 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2945 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2946 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2947 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2948 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2949 var
->data
.read_only
= true;
2951 if (qual
->flags
.q
.explicit_image_format
) {
2952 if (var
->data
.mode
== ir_var_function_in
) {
2953 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2954 "used on image function parameters");
2957 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2958 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2959 "base data type of the image");
2962 var
->data
.image_format
= qual
->image_format
;
2964 if (var
->data
.mode
== ir_var_uniform
) {
2965 if (state
->es_shader
) {
2966 _mesa_glsl_error(loc
, state
, "all image uniforms "
2967 "must have a format layout qualifier");
2969 } else if (!qual
->flags
.q
.write_only
) {
2970 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
2971 "`writeonly' must have a format layout "
2976 var
->data
.image_format
= GL_NONE
;
2979 /* From page 70 of the GLSL ES 3.1 specification:
2981 * "Except for image variables qualified with the format qualifiers
2982 * r32f, r32i, and r32ui, image variables must specify either memory
2983 * qualifier readonly or the memory qualifier writeonly."
2985 if (state
->es_shader
&&
2986 var
->data
.image_format
!= GL_R32F
&&
2987 var
->data
.image_format
!= GL_R32I
&&
2988 var
->data
.image_format
!= GL_R32UI
&&
2989 !var
->data
.image_read_only
&&
2990 !var
->data
.image_write_only
) {
2991 _mesa_glsl_error(loc
, state
, "image variables of format other than "
2992 "r32f, r32i or r32ui must be qualified `readonly' or "
2996 } else if (qual
->flags
.q
.read_only
||
2997 qual
->flags
.q
.write_only
||
2998 qual
->flags
.q
.coherent
||
2999 qual
->flags
.q
._volatile
||
3000 qual
->flags
.q
.restrict_flag
||
3001 qual
->flags
.q
.explicit_image_format
) {
3002 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3007 static inline const char*
3008 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3010 if (origin_upper_left
&& pixel_center_integer
)
3011 return "origin_upper_left, pixel_center_integer";
3012 else if (origin_upper_left
)
3013 return "origin_upper_left";
3014 else if (pixel_center_integer
)
3015 return "pixel_center_integer";
3021 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3022 const struct ast_type_qualifier
*qual
)
3024 /* If gl_FragCoord was previously declared, and the qualifiers were
3025 * different in any way, return true.
3027 if (state
->fs_redeclares_gl_fragcoord
) {
3028 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3029 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3036 validate_array_dimensions(const glsl_type
*t
,
3037 struct _mesa_glsl_parse_state
*state
,
3039 if (t
->is_array()) {
3040 t
= t
->fields
.array
;
3041 while (t
->is_array()) {
3042 if (t
->is_unsized_array()) {
3043 _mesa_glsl_error(loc
, state
,
3044 "only the outermost array dimension can "
3049 t
= t
->fields
.array
;
3055 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3057 struct _mesa_glsl_parse_state
*state
,
3060 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3062 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3064 * "Within any shader, the first redeclarations of gl_FragCoord
3065 * must appear before any use of gl_FragCoord."
3067 * Generate a compiler error if above condition is not met by the
3070 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3071 if (earlier
!= NULL
&&
3072 earlier
->data
.used
&&
3073 !state
->fs_redeclares_gl_fragcoord
) {
3074 _mesa_glsl_error(loc
, state
,
3075 "gl_FragCoord used before its first redeclaration "
3076 "in fragment shader");
3079 /* Make sure all gl_FragCoord redeclarations specify the same layout
3082 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3083 const char *const qual_string
=
3084 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3085 qual
->flags
.q
.pixel_center_integer
);
3087 const char *const state_string
=
3088 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3089 state
->fs_pixel_center_integer
);
3091 _mesa_glsl_error(loc
, state
,
3092 "gl_FragCoord redeclared with different layout "
3093 "qualifiers (%s) and (%s) ",
3097 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3098 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3099 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3100 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3101 state
->fs_redeclares_gl_fragcoord
=
3102 state
->fs_origin_upper_left
||
3103 state
->fs_pixel_center_integer
||
3104 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3107 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3108 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3109 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3110 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3111 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3112 ? "origin_upper_left" : "pixel_center_integer";
3114 _mesa_glsl_error(loc
, state
,
3115 "layout qualifier `%s' can only be applied to "
3116 "fragment shader input `gl_FragCoord'",
3120 if (qual
->flags
.q
.explicit_location
) {
3121 apply_explicit_location(qual
, var
, state
, loc
);
3122 } else if (qual
->flags
.q
.explicit_index
) {
3123 if (!qual
->flags
.q
.subroutine_def
)
3124 _mesa_glsl_error(loc
, state
,
3125 "explicit index requires explicit location");
3128 if (qual
->flags
.q
.explicit_binding
) {
3129 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3132 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3133 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3134 unsigned qual_stream
;
3135 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3137 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3138 var
->data
.stream
= qual_stream
;
3142 if (var
->type
->contains_atomic()) {
3143 if (var
->data
.mode
== ir_var_uniform
) {
3144 if (var
->data
.explicit_binding
) {
3146 &state
->atomic_counter_offsets
[var
->data
.binding
];
3148 if (*offset
% ATOMIC_COUNTER_SIZE
)
3149 _mesa_glsl_error(loc
, state
,
3150 "misaligned atomic counter offset");
3152 var
->data
.offset
= *offset
;
3153 *offset
+= var
->type
->atomic_size();
3156 _mesa_glsl_error(loc
, state
,
3157 "atomic counters require explicit binding point");
3159 } else if (var
->data
.mode
!= ir_var_function_in
) {
3160 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3161 "function parameters or uniform-qualified "
3162 "global variables");
3166 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3167 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3168 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3169 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3170 * These extensions and all following extensions that add the 'layout'
3171 * keyword have been modified to require the use of 'in' or 'out'.
3173 * The following extension do not allow the deprecated keywords:
3175 * GL_AMD_conservative_depth
3176 * GL_ARB_conservative_depth
3177 * GL_ARB_gpu_shader5
3178 * GL_ARB_separate_shader_objects
3179 * GL_ARB_tessellation_shader
3180 * GL_ARB_transform_feedback3
3181 * GL_ARB_uniform_buffer_object
3183 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3184 * allow layout with the deprecated keywords.
3186 const bool relaxed_layout_qualifier_checking
=
3187 state
->ARB_fragment_coord_conventions_enable
;
3189 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3190 || qual
->flags
.q
.varying
;
3191 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3192 if (relaxed_layout_qualifier_checking
) {
3193 _mesa_glsl_warning(loc
, state
,
3194 "`layout' qualifier may not be used with "
3195 "`attribute' or `varying'");
3197 _mesa_glsl_error(loc
, state
,
3198 "`layout' qualifier may not be used with "
3199 "`attribute' or `varying'");
3203 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3204 * AMD_conservative_depth.
3206 int depth_layout_count
= qual
->flags
.q
.depth_any
3207 + qual
->flags
.q
.depth_greater
3208 + qual
->flags
.q
.depth_less
3209 + qual
->flags
.q
.depth_unchanged
;
3210 if (depth_layout_count
> 0
3211 && !state
->AMD_conservative_depth_enable
3212 && !state
->ARB_conservative_depth_enable
) {
3213 _mesa_glsl_error(loc
, state
,
3214 "extension GL_AMD_conservative_depth or "
3215 "GL_ARB_conservative_depth must be enabled "
3216 "to use depth layout qualifiers");
3217 } else if (depth_layout_count
> 0
3218 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3219 _mesa_glsl_error(loc
, state
,
3220 "depth layout qualifiers can be applied only to "
3222 } else if (depth_layout_count
> 1
3223 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3224 _mesa_glsl_error(loc
, state
,
3225 "at most one depth layout qualifier can be applied to "
3228 if (qual
->flags
.q
.depth_any
)
3229 var
->data
.depth_layout
= ir_depth_layout_any
;
3230 else if (qual
->flags
.q
.depth_greater
)
3231 var
->data
.depth_layout
= ir_depth_layout_greater
;
3232 else if (qual
->flags
.q
.depth_less
)
3233 var
->data
.depth_layout
= ir_depth_layout_less
;
3234 else if (qual
->flags
.q
.depth_unchanged
)
3235 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3237 var
->data
.depth_layout
= ir_depth_layout_none
;
3239 if (qual
->flags
.q
.std140
||
3240 qual
->flags
.q
.std430
||
3241 qual
->flags
.q
.packed
||
3242 qual
->flags
.q
.shared
) {
3243 _mesa_glsl_error(loc
, state
,
3244 "uniform and shader storage block layout qualifiers "
3245 "std140, std430, packed, and shared can only be "
3246 "applied to uniform or shader storage blocks, not "
3250 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3251 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3254 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3257 * "Fragment shaders also allow the following layout qualifier on in only
3258 * (not with variable declarations)
3259 * layout-qualifier-id
3260 * early_fragment_tests
3263 if (qual
->flags
.q
.early_fragment_tests
) {
3264 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3265 "valid in fragment shader input layout declaration.");
3270 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3272 struct _mesa_glsl_parse_state
*state
,
3276 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3278 if (qual
->flags
.q
.invariant
) {
3279 if (var
->data
.used
) {
3280 _mesa_glsl_error(loc
, state
,
3281 "variable `%s' may not be redeclared "
3282 "`invariant' after being used",
3285 var
->data
.invariant
= 1;
3289 if (qual
->flags
.q
.precise
) {
3290 if (var
->data
.used
) {
3291 _mesa_glsl_error(loc
, state
,
3292 "variable `%s' may not be redeclared "
3293 "`precise' after being used",
3296 var
->data
.precise
= 1;
3300 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3301 _mesa_glsl_error(loc
, state
,
3302 "`subroutine' may only be applied to uniforms, "
3303 "subroutine type declarations, or function definitions");
3306 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3307 || qual
->flags
.q
.uniform
3308 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3309 var
->data
.read_only
= 1;
3311 if (qual
->flags
.q
.centroid
)
3312 var
->data
.centroid
= 1;
3314 if (qual
->flags
.q
.sample
)
3315 var
->data
.sample
= 1;
3317 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3318 if (state
->es_shader
) {
3319 var
->data
.precision
=
3320 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3323 if (qual
->flags
.q
.patch
)
3324 var
->data
.patch
= 1;
3326 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3327 var
->type
= glsl_type::error_type
;
3328 _mesa_glsl_error(loc
, state
,
3329 "`attribute' variables may not be declared in the "
3331 _mesa_shader_stage_to_string(state
->stage
));
3334 /* Disallow layout qualifiers which may only appear on layout declarations. */
3335 if (qual
->flags
.q
.prim_type
) {
3336 _mesa_glsl_error(loc
, state
,
3337 "Primitive type may only be specified on GS input or output "
3338 "layout declaration, not on variables.");
3341 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3343 * "However, the const qualifier cannot be used with out or inout."
3345 * The same section of the GLSL 4.40 spec further clarifies this saying:
3347 * "The const qualifier cannot be used with out or inout, or a
3348 * compile-time error results."
3350 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3351 _mesa_glsl_error(loc
, state
,
3352 "`const' may not be applied to `out' or `inout' "
3353 "function parameters");
3356 /* If there is no qualifier that changes the mode of the variable, leave
3357 * the setting alone.
3359 assert(var
->data
.mode
!= ir_var_temporary
);
3360 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3361 var
->data
.mode
= ir_var_function_inout
;
3362 else if (qual
->flags
.q
.in
)
3363 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3364 else if (qual
->flags
.q
.attribute
3365 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3366 var
->data
.mode
= ir_var_shader_in
;
3367 else if (qual
->flags
.q
.out
)
3368 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3369 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3370 var
->data
.mode
= ir_var_shader_out
;
3371 else if (qual
->flags
.q
.uniform
)
3372 var
->data
.mode
= ir_var_uniform
;
3373 else if (qual
->flags
.q
.buffer
)
3374 var
->data
.mode
= ir_var_shader_storage
;
3375 else if (qual
->flags
.q
.shared_storage
)
3376 var
->data
.mode
= ir_var_shader_shared
;
3378 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3379 /* User-defined ins/outs are not permitted in compute shaders. */
3380 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3381 _mesa_glsl_error(loc
, state
,
3382 "user-defined input and output variables are not "
3383 "permitted in compute shaders");
3386 /* This variable is being used to link data between shader stages (in
3387 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3388 * that is allowed for such purposes.
3390 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3392 * "The varying qualifier can be used only with the data types
3393 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3396 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3397 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3399 * "Fragment inputs can only be signed and unsigned integers and
3400 * integer vectors, float, floating-point vectors, matrices, or
3401 * arrays of these. Structures cannot be input.
3403 * Similar text exists in the section on vertex shader outputs.
3405 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3406 * 3.00 spec allows structs as well. Varying structs are also allowed
3409 switch (var
->type
->get_scalar_type()->base_type
) {
3410 case GLSL_TYPE_FLOAT
:
3411 /* Ok in all GLSL versions */
3413 case GLSL_TYPE_UINT
:
3415 if (state
->is_version(130, 300))
3417 _mesa_glsl_error(loc
, state
,
3418 "varying variables must be of base type float in %s",
3419 state
->get_version_string());
3421 case GLSL_TYPE_STRUCT
:
3422 if (state
->is_version(150, 300))
3424 _mesa_glsl_error(loc
, state
,
3425 "varying variables may not be of type struct");
3427 case GLSL_TYPE_DOUBLE
:
3430 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3435 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3436 switch (state
->stage
) {
3437 case MESA_SHADER_VERTEX
:
3438 if (var
->data
.mode
== ir_var_shader_out
)
3439 var
->data
.invariant
= true;
3441 case MESA_SHADER_TESS_CTRL
:
3442 case MESA_SHADER_TESS_EVAL
:
3443 case MESA_SHADER_GEOMETRY
:
3444 if ((var
->data
.mode
== ir_var_shader_in
)
3445 || (var
->data
.mode
== ir_var_shader_out
))
3446 var
->data
.invariant
= true;
3448 case MESA_SHADER_FRAGMENT
:
3449 if (var
->data
.mode
== ir_var_shader_in
)
3450 var
->data
.invariant
= true;
3452 case MESA_SHADER_COMPUTE
:
3453 /* Invariance isn't meaningful in compute shaders. */
3458 var
->data
.interpolation
=
3459 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
3462 /* Does the declaration use the deprecated 'attribute' or 'varying'
3465 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3466 || qual
->flags
.q
.varying
;
3469 /* Validate auxiliary storage qualifiers */
3471 /* From section 4.3.4 of the GLSL 1.30 spec:
3472 * "It is an error to use centroid in in a vertex shader."
3474 * From section 4.3.4 of the GLSL ES 3.00 spec:
3475 * "It is an error to use centroid in or interpolation qualifiers in
3476 * a vertex shader input."
3479 /* Section 4.3.6 of the GLSL 1.30 specification states:
3480 * "It is an error to use centroid out in a fragment shader."
3482 * The GL_ARB_shading_language_420pack extension specification states:
3483 * "It is an error to use auxiliary storage qualifiers or interpolation
3484 * qualifiers on an output in a fragment shader."
3486 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3487 _mesa_glsl_error(loc
, state
,
3488 "sample qualifier may only be used on `in` or `out` "
3489 "variables between shader stages");
3491 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3492 _mesa_glsl_error(loc
, state
,
3493 "centroid qualifier may only be used with `in', "
3494 "`out' or `varying' variables between shader stages");
3497 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3498 _mesa_glsl_error(loc
, state
,
3499 "the shared storage qualifiers can only be used with "
3503 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3507 * Get the variable that is being redeclared by this declaration
3509 * Semantic checks to verify the validity of the redeclaration are also
3510 * performed. If semantic checks fail, compilation error will be emitted via
3511 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3514 * A pointer to an existing variable in the current scope if the declaration
3515 * is a redeclaration, \c NULL otherwise.
3517 static ir_variable
*
3518 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3519 struct _mesa_glsl_parse_state
*state
,
3520 bool allow_all_redeclarations
)
3522 /* Check if this declaration is actually a re-declaration, either to
3523 * resize an array or add qualifiers to an existing variable.
3525 * This is allowed for variables in the current scope, or when at
3526 * global scope (for built-ins in the implicit outer scope).
3528 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3529 if (earlier
== NULL
||
3530 (state
->current_function
!= NULL
&&
3531 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3536 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3538 * "It is legal to declare an array without a size and then
3539 * later re-declare the same name as an array of the same
3540 * type and specify a size."
3542 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3543 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3544 /* FINISHME: This doesn't match the qualifiers on the two
3545 * FINISHME: declarations. It's not 100% clear whether this is
3546 * FINISHME: required or not.
3549 const unsigned size
= unsigned(var
->type
->array_size());
3550 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3551 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3552 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3554 earlier
->data
.max_array_access
);
3557 earlier
->type
= var
->type
;
3560 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3561 state
->is_version(150, 0))
3562 && strcmp(var
->name
, "gl_FragCoord") == 0
3563 && earlier
->type
== var
->type
3564 && var
->data
.mode
== ir_var_shader_in
) {
3565 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3568 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3569 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3571 /* According to section 4.3.7 of the GLSL 1.30 spec,
3572 * the following built-in varaibles can be redeclared with an
3573 * interpolation qualifier:
3576 * * gl_FrontSecondaryColor
3577 * * gl_BackSecondaryColor
3579 * * gl_SecondaryColor
3581 } else if (state
->is_version(130, 0)
3582 && (strcmp(var
->name
, "gl_FrontColor") == 0
3583 || strcmp(var
->name
, "gl_BackColor") == 0
3584 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3585 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3586 || strcmp(var
->name
, "gl_Color") == 0
3587 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3588 && earlier
->type
== var
->type
3589 && earlier
->data
.mode
== var
->data
.mode
) {
3590 earlier
->data
.interpolation
= var
->data
.interpolation
;
3592 /* Layout qualifiers for gl_FragDepth. */
3593 } else if ((state
->AMD_conservative_depth_enable
||
3594 state
->ARB_conservative_depth_enable
)
3595 && strcmp(var
->name
, "gl_FragDepth") == 0
3596 && earlier
->type
== var
->type
3597 && earlier
->data
.mode
== var
->data
.mode
) {
3599 /** From the AMD_conservative_depth spec:
3600 * Within any shader, the first redeclarations of gl_FragDepth
3601 * must appear before any use of gl_FragDepth.
3603 if (earlier
->data
.used
) {
3604 _mesa_glsl_error(&loc
, state
,
3605 "the first redeclaration of gl_FragDepth "
3606 "must appear before any use of gl_FragDepth");
3609 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3610 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3611 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3612 _mesa_glsl_error(&loc
, state
,
3613 "gl_FragDepth: depth layout is declared here "
3614 "as '%s, but it was previously declared as "
3616 depth_layout_string(var
->data
.depth_layout
),
3617 depth_layout_string(earlier
->data
.depth_layout
));
3620 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3622 } else if (allow_all_redeclarations
) {
3623 if (earlier
->data
.mode
!= var
->data
.mode
) {
3624 _mesa_glsl_error(&loc
, state
,
3625 "redeclaration of `%s' with incorrect qualifiers",
3627 } else if (earlier
->type
!= var
->type
) {
3628 _mesa_glsl_error(&loc
, state
,
3629 "redeclaration of `%s' has incorrect type",
3633 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3640 * Generate the IR for an initializer in a variable declaration
3643 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3644 ast_fully_specified_type
*type
,
3645 exec_list
*initializer_instructions
,
3646 struct _mesa_glsl_parse_state
*state
)
3648 ir_rvalue
*result
= NULL
;
3650 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3652 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3654 * "All uniform variables are read-only and are initialized either
3655 * directly by an application via API commands, or indirectly by
3658 if (var
->data
.mode
== ir_var_uniform
) {
3659 state
->check_version(120, 0, &initializer_loc
,
3660 "cannot initialize uniform %s",
3664 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3666 * "Buffer variables cannot have initializers."
3668 if (var
->data
.mode
== ir_var_shader_storage
) {
3669 _mesa_glsl_error(&initializer_loc
, state
,
3670 "cannot initialize buffer variable %s",
3674 /* From section 4.1.7 of the GLSL 4.40 spec:
3676 * "Opaque variables [...] are initialized only through the
3677 * OpenGL API; they cannot be declared with an initializer in a
3680 if (var
->type
->contains_opaque()) {
3681 _mesa_glsl_error(&initializer_loc
, state
,
3682 "cannot initialize opaque variable %s",
3686 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3687 _mesa_glsl_error(&initializer_loc
, state
,
3688 "cannot initialize %s shader input / %s %s",
3689 _mesa_shader_stage_to_string(state
->stage
),
3690 (state
->stage
== MESA_SHADER_VERTEX
)
3691 ? "attribute" : "varying",
3695 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
3696 _mesa_glsl_error(&initializer_loc
, state
,
3697 "cannot initialize %s shader output %s",
3698 _mesa_shader_stage_to_string(state
->stage
),
3702 /* If the initializer is an ast_aggregate_initializer, recursively store
3703 * type information from the LHS into it, so that its hir() function can do
3706 if (decl
->initializer
->oper
== ast_aggregate
)
3707 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3709 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3710 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3712 /* Calculate the constant value if this is a const or uniform
3715 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
3717 * "Declarations of globals without a storage qualifier, or with
3718 * just the const qualifier, may include initializers, in which case
3719 * they will be initialized before the first line of main() is
3720 * executed. Such initializers must be a constant expression."
3722 * The same section of the GLSL ES 3.00.4 spec has similar language.
3724 if (type
->qualifier
.flags
.q
.constant
3725 || type
->qualifier
.flags
.q
.uniform
3726 || (state
->es_shader
&& state
->current_function
== NULL
)) {
3727 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3729 if (new_rhs
!= NULL
) {
3732 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
3735 * "A constant expression is one of
3739 * - an expression formed by an operator on operands that are
3740 * all constant expressions, including getting an element of
3741 * a constant array, or a field of a constant structure, or
3742 * components of a constant vector. However, the sequence
3743 * operator ( , ) and the assignment operators ( =, +=, ...)
3744 * are not included in the operators that can create a
3745 * constant expression."
3747 * Section 12.43 (Sequence operator and constant expressions) says:
3749 * "Should the following construct be allowed?
3753 * The expression within the brackets uses the sequence operator
3754 * (',') and returns the integer 3 so the construct is declaring
3755 * a single-dimensional array of size 3. In some languages, the
3756 * construct declares a two-dimensional array. It would be
3757 * preferable to make this construct illegal to avoid confusion.
3759 * One possibility is to change the definition of the sequence
3760 * operator so that it does not return a constant-expression and
3761 * hence cannot be used to declare an array size.
3763 * RESOLUTION: The result of a sequence operator is not a
3764 * constant-expression."
3766 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
3767 * contains language almost identical to the section 4.3.3 in the
3768 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
3771 ir_constant
*constant_value
= rhs
->constant_expression_value();
3772 if (!constant_value
||
3773 (state
->is_version(430, 300) &&
3774 decl
->initializer
->has_sequence_subexpression())) {
3775 const char *const variable_mode
=
3776 (type
->qualifier
.flags
.q
.constant
)
3778 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
3780 /* If ARB_shading_language_420pack is enabled, initializers of
3781 * const-qualified local variables do not have to be constant
3782 * expressions. Const-qualified global variables must still be
3783 * initialized with constant expressions.
3785 if (!state
->has_420pack()
3786 || state
->current_function
== NULL
) {
3787 _mesa_glsl_error(& initializer_loc
, state
,
3788 "initializer of %s variable `%s' must be a "
3789 "constant expression",
3792 if (var
->type
->is_numeric()) {
3793 /* Reduce cascading errors. */
3794 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3795 ? ir_constant::zero(state
, var
->type
) : NULL
;
3799 rhs
= constant_value
;
3800 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3801 ? constant_value
: NULL
;
3804 if (var
->type
->is_numeric()) {
3805 /* Reduce cascading errors. */
3806 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3807 ? ir_constant::zero(state
, var
->type
) : NULL
;
3812 if (rhs
&& !rhs
->type
->is_error()) {
3813 bool temp
= var
->data
.read_only
;
3814 if (type
->qualifier
.flags
.q
.constant
)
3815 var
->data
.read_only
= false;
3817 /* Never emit code to initialize a uniform.
3819 const glsl_type
*initializer_type
;
3820 if (!type
->qualifier
.flags
.q
.uniform
) {
3821 do_assignment(initializer_instructions
, state
,
3826 type
->get_location());
3827 initializer_type
= result
->type
;
3829 initializer_type
= rhs
->type
;
3831 var
->constant_initializer
= rhs
->constant_expression_value();
3832 var
->data
.has_initializer
= true;
3834 /* If the declared variable is an unsized array, it must inherrit
3835 * its full type from the initializer. A declaration such as
3837 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3841 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3843 * The assignment generated in the if-statement (below) will also
3844 * automatically handle this case for non-uniforms.
3846 * If the declared variable is not an array, the types must
3847 * already match exactly. As a result, the type assignment
3848 * here can be done unconditionally. For non-uniforms the call
3849 * to do_assignment can change the type of the initializer (via
3850 * the implicit conversion rules). For uniforms the initializer
3851 * must be a constant expression, and the type of that expression
3852 * was validated above.
3854 var
->type
= initializer_type
;
3856 var
->data
.read_only
= temp
;
3863 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3864 YYLTYPE loc
, ir_variable
*var
,
3865 unsigned num_vertices
,
3867 const char *var_category
)
3869 if (var
->type
->is_unsized_array()) {
3870 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3872 * All geometry shader input unsized array declarations will be
3873 * sized by an earlier input layout qualifier, when present, as per
3874 * the following table.
3876 * Followed by a table mapping each allowed input layout qualifier to
3877 * the corresponding input length.
3879 * Similarly for tessellation control shader outputs.
3881 if (num_vertices
!= 0)
3882 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3885 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3886 * includes the following examples of compile-time errors:
3888 * // code sequence within one shader...
3889 * in vec4 Color1[]; // size unknown
3890 * ...Color1.length()...// illegal, length() unknown
3891 * in vec4 Color2[2]; // size is 2
3892 * ...Color1.length()...// illegal, Color1 still has no size
3893 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3894 * layout(lines) in; // legal, input size is 2, matching
3895 * in vec4 Color4[3]; // illegal, contradicts layout
3898 * To detect the case illustrated by Color3, we verify that the size of
3899 * an explicitly-sized array matches the size of any previously declared
3900 * explicitly-sized array. To detect the case illustrated by Color4, we
3901 * verify that the size of an explicitly-sized array is consistent with
3902 * any previously declared input layout.
3904 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3905 _mesa_glsl_error(&loc
, state
,
3906 "%s size contradicts previously declared layout "
3907 "(size is %u, but layout requires a size of %u)",
3908 var_category
, var
->type
->length
, num_vertices
);
3909 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3910 _mesa_glsl_error(&loc
, state
,
3911 "%s sizes are inconsistent (size is %u, but a "
3912 "previous declaration has size %u)",
3913 var_category
, var
->type
->length
, *size
);
3915 *size
= var
->type
->length
;
3921 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3922 YYLTYPE loc
, ir_variable
*var
)
3924 unsigned num_vertices
= 0;
3926 if (state
->tcs_output_vertices_specified
) {
3927 if (!state
->out_qualifier
->vertices
->
3928 process_qualifier_constant(state
, "vertices",
3929 &num_vertices
, false)) {
3933 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
3934 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
3935 "GL_MAX_PATCH_VERTICES", num_vertices
);
3940 if (!var
->type
->is_array() && !var
->data
.patch
) {
3941 _mesa_glsl_error(&loc
, state
,
3942 "tessellation control shader outputs must be arrays");
3944 /* To avoid cascading failures, short circuit the checks below. */
3948 if (var
->data
.patch
)
3951 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3952 &state
->tcs_output_size
,
3953 "tessellation control shader output");
3957 * Do additional processing necessary for tessellation control/evaluation shader
3958 * input declarations. This covers both interface block arrays and bare input
3962 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3963 YYLTYPE loc
, ir_variable
*var
)
3965 if (!var
->type
->is_array() && !var
->data
.patch
) {
3966 _mesa_glsl_error(&loc
, state
,
3967 "per-vertex tessellation shader inputs must be arrays");
3968 /* Avoid cascading failures. */
3972 if (var
->data
.patch
)
3975 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
3976 if (var
->type
->is_unsized_array()) {
3977 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3978 state
->Const
.MaxPatchVertices
);
3984 * Do additional processing necessary for geometry shader input declarations
3985 * (this covers both interface blocks arrays and bare input variables).
3988 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3989 YYLTYPE loc
, ir_variable
*var
)
3991 unsigned num_vertices
= 0;
3993 if (state
->gs_input_prim_type_specified
) {
3994 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
3997 /* Geometry shader input variables must be arrays. Caller should have
3998 * reported an error for this.
4000 if (!var
->type
->is_array()) {
4001 assert(state
->error
);
4003 /* To avoid cascading failures, short circuit the checks below. */
4007 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4008 &state
->gs_input_size
,
4009 "geometry shader input");
4013 validate_identifier(const char *identifier
, YYLTYPE loc
,
4014 struct _mesa_glsl_parse_state
*state
)
4016 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4018 * "Identifiers starting with "gl_" are reserved for use by
4019 * OpenGL, and may not be declared in a shader as either a
4020 * variable or a function."
4022 if (is_gl_identifier(identifier
)) {
4023 _mesa_glsl_error(&loc
, state
,
4024 "identifier `%s' uses reserved `gl_' prefix",
4026 } else if (strstr(identifier
, "__")) {
4027 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4030 * "In addition, all identifiers containing two
4031 * consecutive underscores (__) are reserved as
4032 * possible future keywords."
4034 * The intention is that names containing __ are reserved for internal
4035 * use by the implementation, and names prefixed with GL_ are reserved
4036 * for use by Khronos. Names simply containing __ are dangerous to use,
4037 * but should be allowed.
4039 * A future version of the GLSL specification will clarify this.
4041 _mesa_glsl_warning(&loc
, state
,
4042 "identifier `%s' uses reserved `__' string",
4048 ast_declarator_list::hir(exec_list
*instructions
,
4049 struct _mesa_glsl_parse_state
*state
)
4052 const struct glsl_type
*decl_type
;
4053 const char *type_name
= NULL
;
4054 ir_rvalue
*result
= NULL
;
4055 YYLTYPE loc
= this->get_location();
4057 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4059 * "To ensure that a particular output variable is invariant, it is
4060 * necessary to use the invariant qualifier. It can either be used to
4061 * qualify a previously declared variable as being invariant
4063 * invariant gl_Position; // make existing gl_Position be invariant"
4065 * In these cases the parser will set the 'invariant' flag in the declarator
4066 * list, and the type will be NULL.
4068 if (this->invariant
) {
4069 assert(this->type
== NULL
);
4071 if (state
->current_function
!= NULL
) {
4072 _mesa_glsl_error(& loc
, state
,
4073 "all uses of `invariant' keyword must be at global "
4077 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4078 assert(decl
->array_specifier
== NULL
);
4079 assert(decl
->initializer
== NULL
);
4081 ir_variable
*const earlier
=
4082 state
->symbols
->get_variable(decl
->identifier
);
4083 if (earlier
== NULL
) {
4084 _mesa_glsl_error(& loc
, state
,
4085 "undeclared variable `%s' cannot be marked "
4086 "invariant", decl
->identifier
);
4087 } else if (!is_varying_var(earlier
, state
->stage
)) {
4088 _mesa_glsl_error(&loc
, state
,
4089 "`%s' cannot be marked invariant; interfaces between "
4090 "shader stages only.", decl
->identifier
);
4091 } else if (earlier
->data
.used
) {
4092 _mesa_glsl_error(& loc
, state
,
4093 "variable `%s' may not be redeclared "
4094 "`invariant' after being used",
4097 earlier
->data
.invariant
= true;
4101 /* Invariant redeclarations do not have r-values.
4106 if (this->precise
) {
4107 assert(this->type
== NULL
);
4109 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4110 assert(decl
->array_specifier
== NULL
);
4111 assert(decl
->initializer
== NULL
);
4113 ir_variable
*const earlier
=
4114 state
->symbols
->get_variable(decl
->identifier
);
4115 if (earlier
== NULL
) {
4116 _mesa_glsl_error(& loc
, state
,
4117 "undeclared variable `%s' cannot be marked "
4118 "precise", decl
->identifier
);
4119 } else if (state
->current_function
!= NULL
&&
4120 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4121 /* Note: we have to check if we're in a function, since
4122 * builtins are treated as having come from another scope.
4124 _mesa_glsl_error(& loc
, state
,
4125 "variable `%s' from an outer scope may not be "
4126 "redeclared `precise' in this scope",
4128 } else if (earlier
->data
.used
) {
4129 _mesa_glsl_error(& loc
, state
,
4130 "variable `%s' may not be redeclared "
4131 "`precise' after being used",
4134 earlier
->data
.precise
= true;
4138 /* Precise redeclarations do not have r-values either. */
4142 assert(this->type
!= NULL
);
4143 assert(!this->invariant
);
4144 assert(!this->precise
);
4146 /* The type specifier may contain a structure definition. Process that
4147 * before any of the variable declarations.
4149 (void) this->type
->specifier
->hir(instructions
, state
);
4151 decl_type
= this->type
->glsl_type(& type_name
, state
);
4153 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4154 * "Buffer variables may only be declared inside interface blocks
4155 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4156 * shader storage blocks. It is a compile-time error to declare buffer
4157 * variables at global scope (outside a block)."
4159 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4160 _mesa_glsl_error(&loc
, state
,
4161 "buffer variables cannot be declared outside "
4162 "interface blocks");
4165 /* An offset-qualified atomic counter declaration sets the default
4166 * offset for the next declaration within the same atomic counter
4169 if (decl_type
&& decl_type
->contains_atomic()) {
4170 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4171 type
->qualifier
.flags
.q
.explicit_offset
) {
4172 unsigned qual_binding
;
4173 unsigned qual_offset
;
4174 if (process_qualifier_constant(state
, &loc
, "binding",
4175 type
->qualifier
.binding
,
4177 && process_qualifier_constant(state
, &loc
, "offset",
4178 type
->qualifier
.offset
,
4180 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4185 if (this->declarations
.is_empty()) {
4186 /* If there is no structure involved in the program text, there are two
4187 * possible scenarios:
4189 * - The program text contained something like 'vec4;'. This is an
4190 * empty declaration. It is valid but weird. Emit a warning.
4192 * - The program text contained something like 'S;' and 'S' is not the
4193 * name of a known structure type. This is both invalid and weird.
4196 * - The program text contained something like 'mediump float;'
4197 * when the programmer probably meant 'precision mediump
4198 * float;' Emit a warning with a description of what they
4199 * probably meant to do.
4201 * Note that if decl_type is NULL and there is a structure involved,
4202 * there must have been some sort of error with the structure. In this
4203 * case we assume that an error was already generated on this line of
4204 * code for the structure. There is no need to generate an additional,
4207 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4210 if (decl_type
== NULL
) {
4211 _mesa_glsl_error(&loc
, state
,
4212 "invalid type `%s' in empty declaration",
4215 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4216 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4218 * "The combinations of types and qualifiers that cause
4219 * compile-time or link-time errors are the same whether or not
4220 * the declaration is empty."
4222 validate_array_dimensions(decl_type
, state
, &loc
);
4225 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4226 /* Empty atomic counter declarations are allowed and useful
4227 * to set the default offset qualifier.
4230 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4231 if (this->type
->specifier
->structure
!= NULL
) {
4232 _mesa_glsl_error(&loc
, state
,
4233 "precision qualifiers can't be applied "
4236 static const char *const precision_names
[] = {
4243 _mesa_glsl_warning(&loc
, state
,
4244 "empty declaration with precision "
4245 "qualifier, to set the default precision, "
4246 "use `precision %s %s;'",
4247 precision_names
[this->type
->
4248 qualifier
.precision
],
4251 } else if (this->type
->specifier
->structure
== NULL
) {
4252 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4257 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4258 const struct glsl_type
*var_type
;
4260 const char *identifier
= decl
->identifier
;
4261 /* FINISHME: Emit a warning if a variable declaration shadows a
4262 * FINISHME: declaration at a higher scope.
4265 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4266 if (type_name
!= NULL
) {
4267 _mesa_glsl_error(& loc
, state
,
4268 "invalid type `%s' in declaration of `%s'",
4269 type_name
, decl
->identifier
);
4271 _mesa_glsl_error(& loc
, state
,
4272 "invalid type in declaration of `%s'",
4278 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4282 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4284 _mesa_glsl_error(& loc
, state
,
4285 "invalid type in declaration of `%s'",
4287 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4292 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4295 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4297 /* The 'varying in' and 'varying out' qualifiers can only be used with
4298 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4301 if (this->type
->qualifier
.flags
.q
.varying
) {
4302 if (this->type
->qualifier
.flags
.q
.in
) {
4303 _mesa_glsl_error(& loc
, state
,
4304 "`varying in' qualifier in declaration of "
4305 "`%s' only valid for geometry shaders using "
4306 "ARB_geometry_shader4 or EXT_geometry_shader4",
4308 } else if (this->type
->qualifier
.flags
.q
.out
) {
4309 _mesa_glsl_error(& loc
, state
,
4310 "`varying out' qualifier in declaration of "
4311 "`%s' only valid for geometry shaders using "
4312 "ARB_geometry_shader4 or EXT_geometry_shader4",
4317 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4319 * "Global variables can only use the qualifiers const,
4320 * attribute, uniform, or varying. Only one may be
4323 * Local variables can only use the qualifier const."
4325 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4326 * any extension that adds the 'layout' keyword.
4328 if (!state
->is_version(130, 300)
4329 && !state
->has_explicit_attrib_location()
4330 && !state
->has_separate_shader_objects()
4331 && !state
->ARB_fragment_coord_conventions_enable
) {
4332 if (this->type
->qualifier
.flags
.q
.out
) {
4333 _mesa_glsl_error(& loc
, state
,
4334 "`out' qualifier in declaration of `%s' "
4335 "only valid for function parameters in %s",
4336 decl
->identifier
, state
->get_version_string());
4338 if (this->type
->qualifier
.flags
.q
.in
) {
4339 _mesa_glsl_error(& loc
, state
,
4340 "`in' qualifier in declaration of `%s' "
4341 "only valid for function parameters in %s",
4342 decl
->identifier
, state
->get_version_string());
4344 /* FINISHME: Test for other invalid qualifiers. */
4347 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4349 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4352 if (this->type
->qualifier
.flags
.q
.invariant
) {
4353 if (!is_varying_var(var
, state
->stage
)) {
4354 _mesa_glsl_error(&loc
, state
,
4355 "`%s' cannot be marked invariant; interfaces between "
4356 "shader stages only", var
->name
);
4360 if (state
->current_function
!= NULL
) {
4361 const char *mode
= NULL
;
4362 const char *extra
= "";
4364 /* There is no need to check for 'inout' here because the parser will
4365 * only allow that in function parameter lists.
4367 if (this->type
->qualifier
.flags
.q
.attribute
) {
4369 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4370 mode
= "subroutine uniform";
4371 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4373 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4375 } else if (this->type
->qualifier
.flags
.q
.in
) {
4377 extra
= " or in function parameter list";
4378 } else if (this->type
->qualifier
.flags
.q
.out
) {
4380 extra
= " or in function parameter list";
4384 _mesa_glsl_error(& loc
, state
,
4385 "%s variable `%s' must be declared at "
4387 mode
, var
->name
, extra
);
4389 } else if (var
->data
.mode
== ir_var_shader_in
) {
4390 var
->data
.read_only
= true;
4392 if (state
->stage
== MESA_SHADER_VERTEX
) {
4393 bool error_emitted
= false;
4395 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4397 * "Vertex shader inputs can only be float, floating-point
4398 * vectors, matrices, signed and unsigned integers and integer
4399 * vectors. Vertex shader inputs can also form arrays of these
4400 * types, but not structures."
4402 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4404 * "Vertex shader inputs can only be float, floating-point
4405 * vectors, matrices, signed and unsigned integers and integer
4406 * vectors. They cannot be arrays or structures."
4408 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4410 * "The attribute qualifier can be used only with float,
4411 * floating-point vectors, and matrices. Attribute variables
4412 * cannot be declared as arrays or structures."
4414 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4416 * "Vertex shader inputs can only be float, floating-point
4417 * vectors, matrices, signed and unsigned integers and integer
4418 * vectors. Vertex shader inputs cannot be arrays or
4421 const glsl_type
*check_type
= var
->type
->without_array();
4423 switch (check_type
->base_type
) {
4424 case GLSL_TYPE_FLOAT
:
4426 case GLSL_TYPE_UINT
:
4428 if (state
->is_version(120, 300))
4430 case GLSL_TYPE_DOUBLE
:
4431 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4435 _mesa_glsl_error(& loc
, state
,
4436 "vertex shader input / attribute cannot have "
4438 var
->type
->is_array() ? "array of " : "",
4440 error_emitted
= true;
4443 if (!error_emitted
&& var
->type
->is_array() &&
4444 !state
->check_version(150, 0, &loc
,
4445 "vertex shader input / attribute "
4446 "cannot have array type")) {
4447 error_emitted
= true;
4449 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4450 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4452 * Geometry shader input variables get the per-vertex values
4453 * written out by vertex shader output variables of the same
4454 * names. Since a geometry shader operates on a set of
4455 * vertices, each input varying variable (or input block, see
4456 * interface blocks below) needs to be declared as an array.
4458 if (!var
->type
->is_array()) {
4459 _mesa_glsl_error(&loc
, state
,
4460 "geometry shader inputs must be arrays");
4463 handle_geometry_shader_input_decl(state
, loc
, var
);
4464 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4465 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4467 * It is a compile-time error to declare a fragment shader
4468 * input with, or that contains, any of the following types:
4472 * * An array of arrays
4473 * * An array of structures
4474 * * A structure containing an array
4475 * * A structure containing a structure
4477 if (state
->es_shader
) {
4478 const glsl_type
*check_type
= var
->type
->without_array();
4479 if (check_type
->is_boolean() ||
4480 check_type
->contains_opaque()) {
4481 _mesa_glsl_error(&loc
, state
,
4482 "fragment shader input cannot have type %s",
4485 if (var
->type
->is_array() &&
4486 var
->type
->fields
.array
->is_array()) {
4487 _mesa_glsl_error(&loc
, state
,
4489 "cannot have an array of arrays",
4490 _mesa_shader_stage_to_string(state
->stage
));
4492 if (var
->type
->is_array() &&
4493 var
->type
->fields
.array
->is_record()) {
4494 _mesa_glsl_error(&loc
, state
,
4495 "fragment shader input "
4496 "cannot have an array of structs");
4498 if (var
->type
->is_record()) {
4499 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4500 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4501 var
->type
->fields
.structure
[i
].type
->is_record())
4502 _mesa_glsl_error(&loc
, state
,
4503 "fragement shader input cannot have "
4504 "a struct that contains an "
4509 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4510 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4511 handle_tess_shader_input_decl(state
, loc
, var
);
4513 } else if (var
->data
.mode
== ir_var_shader_out
) {
4514 const glsl_type
*check_type
= var
->type
->without_array();
4516 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4518 * It is a compile-time error to declare a vertex, tessellation
4519 * evaluation, tessellation control, or geometry shader output
4520 * that contains any of the following:
4522 * * A Boolean type (bool, bvec2 ...)
4525 if (check_type
->is_boolean() || check_type
->contains_opaque())
4526 _mesa_glsl_error(&loc
, state
,
4527 "%s shader output cannot have type %s",
4528 _mesa_shader_stage_to_string(state
->stage
),
4531 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4533 * It is a compile-time error to declare a fragment shader output
4534 * that contains any of the following:
4536 * * A Boolean type (bool, bvec2 ...)
4537 * * A double-precision scalar or vector (double, dvec2 ...)
4542 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4543 if (check_type
->is_record() || check_type
->is_matrix())
4544 _mesa_glsl_error(&loc
, state
,
4545 "fragment shader output "
4546 "cannot have struct or matrix type");
4547 switch (check_type
->base_type
) {
4548 case GLSL_TYPE_UINT
:
4550 case GLSL_TYPE_FLOAT
:
4553 _mesa_glsl_error(&loc
, state
,
4554 "fragment shader output cannot have "
4555 "type %s", check_type
->name
);
4559 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4561 * It is a compile-time error to declare a vertex shader output
4562 * with, or that contains, any of the following types:
4566 * * An array of arrays
4567 * * An array of structures
4568 * * A structure containing an array
4569 * * A structure containing a structure
4571 * It is a compile-time error to declare a fragment shader output
4572 * with, or that contains, any of the following types:
4578 * * An array of array
4580 if (state
->es_shader
) {
4581 if (var
->type
->is_array() &&
4582 var
->type
->fields
.array
->is_array()) {
4583 _mesa_glsl_error(&loc
, state
,
4585 "cannot have an array of arrays",
4586 _mesa_shader_stage_to_string(state
->stage
));
4588 if (state
->stage
== MESA_SHADER_VERTEX
) {
4589 if (var
->type
->is_array() &&
4590 var
->type
->fields
.array
->is_record()) {
4591 _mesa_glsl_error(&loc
, state
,
4592 "vertex shader output "
4593 "cannot have an array of structs");
4595 if (var
->type
->is_record()) {
4596 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4597 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4598 var
->type
->fields
.structure
[i
].type
->is_record())
4599 _mesa_glsl_error(&loc
, state
,
4600 "vertex shader output cannot have a "
4601 "struct that contains an "
4608 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4609 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4611 } else if (var
->type
->contains_subroutine()) {
4612 /* declare subroutine uniforms as hidden */
4613 var
->data
.how_declared
= ir_var_hidden
;
4616 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4617 * so must integer vertex outputs.
4619 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4620 * "Fragment shader inputs that are signed or unsigned integers or
4621 * integer vectors must be qualified with the interpolation qualifier
4624 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4625 * "Fragment shader inputs that are, or contain, signed or unsigned
4626 * integers or integer vectors must be qualified with the
4627 * interpolation qualifier flat."
4629 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4630 * "Vertex shader outputs that are, or contain, signed or unsigned
4631 * integers or integer vectors must be qualified with the
4632 * interpolation qualifier flat."
4634 * Note that prior to GLSL 1.50, this requirement applied to vertex
4635 * outputs rather than fragment inputs. That creates problems in the
4636 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4637 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4638 * apply the restriction to both vertex outputs and fragment inputs.
4640 * Note also that the desktop GLSL specs are missing the text "or
4641 * contain"; this is presumably an oversight, since there is no
4642 * reasonable way to interpolate a fragment shader input that contains
4645 if (state
->is_version(130, 300) &&
4646 var
->type
->contains_integer() &&
4647 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4648 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4649 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4650 && state
->es_shader
))) {
4651 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4652 "vertex output" : "fragment input";
4653 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4654 "an integer, then it must be qualified with 'flat'",
4658 /* Double fragment inputs must be qualified with 'flat'. */
4659 if (var
->type
->contains_double() &&
4660 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4661 state
->stage
== MESA_SHADER_FRAGMENT
&&
4662 var
->data
.mode
== ir_var_shader_in
) {
4663 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4664 "a double, then it must be qualified with 'flat'",
4668 /* Interpolation qualifiers cannot be applied to 'centroid' and
4669 * 'centroid varying'.
4671 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4672 * "interpolation qualifiers may only precede the qualifiers in,
4673 * centroid in, out, or centroid out in a declaration. They do not apply
4674 * to the deprecated storage qualifiers varying or centroid varying."
4676 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4678 if (state
->is_version(130, 0)
4679 && this->type
->qualifier
.has_interpolation()
4680 && this->type
->qualifier
.flags
.q
.varying
) {
4682 const char *i
= this->type
->qualifier
.interpolation_string();
4685 if (this->type
->qualifier
.flags
.q
.centroid
)
4686 s
= "centroid varying";
4690 _mesa_glsl_error(&loc
, state
,
4691 "qualifier '%s' cannot be applied to the "
4692 "deprecated storage qualifier '%s'", i
, s
);
4696 /* Interpolation qualifiers can only apply to vertex shader outputs and
4697 * fragment shader inputs.
4699 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4700 * "Outputs from a vertex shader (out) and inputs to a fragment
4701 * shader (in) can be further qualified with one or more of these
4702 * interpolation qualifiers"
4704 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4705 * "These interpolation qualifiers may only precede the qualifiers
4706 * in, centroid in, out, or centroid out in a declaration. They do
4707 * not apply to inputs into a vertex shader or outputs from a
4710 if (state
->is_version(130, 300)
4711 && this->type
->qualifier
.has_interpolation()) {
4713 const char *i
= this->type
->qualifier
.interpolation_string();
4716 switch (state
->stage
) {
4717 case MESA_SHADER_VERTEX
:
4718 if (this->type
->qualifier
.flags
.q
.in
) {
4719 _mesa_glsl_error(&loc
, state
,
4720 "qualifier '%s' cannot be applied to vertex "
4721 "shader inputs", i
);
4724 case MESA_SHADER_FRAGMENT
:
4725 if (this->type
->qualifier
.flags
.q
.out
) {
4726 _mesa_glsl_error(&loc
, state
,
4727 "qualifier '%s' cannot be applied to fragment "
4728 "shader outputs", i
);
4737 /* From section 4.3.4 of the GLSL 4.00 spec:
4738 * "Input variables may not be declared using the patch in qualifier
4739 * in tessellation control or geometry shaders."
4741 * From section 4.3.6 of the GLSL 4.00 spec:
4742 * "It is an error to use patch out in a vertex, tessellation
4743 * evaluation, or geometry shader."
4745 * This doesn't explicitly forbid using them in a fragment shader, but
4746 * that's probably just an oversight.
4748 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4749 && this->type
->qualifier
.flags
.q
.patch
4750 && this->type
->qualifier
.flags
.q
.in
) {
4752 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4753 "tessellation evaluation shader");
4756 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4757 && this->type
->qualifier
.flags
.q
.patch
4758 && this->type
->qualifier
.flags
.q
.out
) {
4760 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4761 "tessellation control shader");
4764 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4766 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4767 state
->check_precision_qualifiers_allowed(&loc
);
4771 /* If a precision qualifier is allowed on a type, it is allowed on
4772 * an array of that type.
4774 if (!(this->type
->qualifier
.precision
== ast_precision_none
4775 || precision_qualifier_allowed(var
->type
->without_array()))) {
4777 _mesa_glsl_error(&loc
, state
,
4778 "precision qualifiers apply only to floating point"
4779 ", integer and opaque types");
4782 /* From section 4.1.7 of the GLSL 4.40 spec:
4784 * "[Opaque types] can only be declared as function
4785 * parameters or uniform-qualified variables."
4787 if (var_type
->contains_opaque() &&
4788 !this->type
->qualifier
.flags
.q
.uniform
) {
4789 _mesa_glsl_error(&loc
, state
,
4790 "opaque variables must be declared uniform");
4793 /* Process the initializer and add its instructions to a temporary
4794 * list. This list will be added to the instruction stream (below) after
4795 * the declaration is added. This is done because in some cases (such as
4796 * redeclarations) the declaration may not actually be added to the
4797 * instruction stream.
4799 exec_list initializer_instructions
;
4801 /* Examine var name here since var may get deleted in the next call */
4802 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4804 ir_variable
*earlier
=
4805 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4806 false /* allow_all_redeclarations */);
4807 if (earlier
!= NULL
) {
4809 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4810 _mesa_glsl_error(&loc
, state
,
4811 "`%s' has already been redeclared using "
4812 "gl_PerVertex", earlier
->name
);
4814 earlier
->data
.how_declared
= ir_var_declared_normally
;
4817 if (decl
->initializer
!= NULL
) {
4818 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4820 &initializer_instructions
, state
);
4822 validate_array_dimensions(var_type
, state
, &loc
);
4825 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4827 * "It is an error to write to a const variable outside of
4828 * its declaration, so they must be initialized when
4831 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4832 _mesa_glsl_error(& loc
, state
,
4833 "const declaration of `%s' must be initialized",
4837 if (state
->es_shader
) {
4838 const glsl_type
*const t
= (earlier
== NULL
)
4839 ? var
->type
: earlier
->type
;
4841 if (t
->is_unsized_array())
4842 /* Section 10.17 of the GLSL ES 1.00 specification states that
4843 * unsized array declarations have been removed from the language.
4844 * Arrays that are sized using an initializer are still explicitly
4845 * sized. However, GLSL ES 1.00 does not allow array
4846 * initializers. That is only allowed in GLSL ES 3.00.
4848 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4850 * "An array type can also be formed without specifying a size
4851 * if the definition includes an initializer:
4853 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4854 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4859 _mesa_glsl_error(& loc
, state
,
4860 "unsized array declarations are not allowed in "
4864 /* If the declaration is not a redeclaration, there are a few additional
4865 * semantic checks that must be applied. In addition, variable that was
4866 * created for the declaration should be added to the IR stream.
4868 if (earlier
== NULL
) {
4869 validate_identifier(decl
->identifier
, loc
, state
);
4871 /* Add the variable to the symbol table. Note that the initializer's
4872 * IR was already processed earlier (though it hasn't been emitted
4873 * yet), without the variable in scope.
4875 * This differs from most C-like languages, but it follows the GLSL
4876 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4879 * "Within a declaration, the scope of a name starts immediately
4880 * after the initializer if present or immediately after the name
4881 * being declared if not."
4883 if (!state
->symbols
->add_variable(var
)) {
4884 YYLTYPE loc
= this->get_location();
4885 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4886 "current scope", decl
->identifier
);
4890 /* Push the variable declaration to the top. It means that all the
4891 * variable declarations will appear in a funny last-to-first order,
4892 * but otherwise we run into trouble if a function is prototyped, a
4893 * global var is decled, then the function is defined with usage of
4894 * the global var. See glslparsertest's CorrectModule.frag.
4896 instructions
->push_head(var
);
4899 instructions
->append_list(&initializer_instructions
);
4903 /* Generally, variable declarations do not have r-values. However,
4904 * one is used for the declaration in
4906 * while (bool b = some_condition()) {
4910 * so we return the rvalue from the last seen declaration here.
4917 ast_parameter_declarator::hir(exec_list
*instructions
,
4918 struct _mesa_glsl_parse_state
*state
)
4921 const struct glsl_type
*type
;
4922 const char *name
= NULL
;
4923 YYLTYPE loc
= this->get_location();
4925 type
= this->type
->glsl_type(& name
, state
);
4929 _mesa_glsl_error(& loc
, state
,
4930 "invalid type `%s' in declaration of `%s'",
4931 name
, this->identifier
);
4933 _mesa_glsl_error(& loc
, state
,
4934 "invalid type in declaration of `%s'",
4938 type
= glsl_type::error_type
;
4941 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4943 * "Functions that accept no input arguments need not use void in the
4944 * argument list because prototypes (or definitions) are required and
4945 * therefore there is no ambiguity when an empty argument list "( )" is
4946 * declared. The idiom "(void)" as a parameter list is provided for
4949 * Placing this check here prevents a void parameter being set up
4950 * for a function, which avoids tripping up checks for main taking
4951 * parameters and lookups of an unnamed symbol.
4953 if (type
->is_void()) {
4954 if (this->identifier
!= NULL
)
4955 _mesa_glsl_error(& loc
, state
,
4956 "named parameter cannot have type `void'");
4962 if (formal_parameter
&& (this->identifier
== NULL
)) {
4963 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4967 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4968 * call already handled the "vec4[..] foo" case.
4970 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4972 if (!type
->is_error() && type
->is_unsized_array()) {
4973 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4975 type
= glsl_type::error_type
;
4979 ir_variable
*var
= new(ctx
)
4980 ir_variable(type
, this->identifier
, ir_var_function_in
);
4982 /* Apply any specified qualifiers to the parameter declaration. Note that
4983 * for function parameters the default mode is 'in'.
4985 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
4988 /* From section 4.1.7 of the GLSL 4.40 spec:
4990 * "Opaque variables cannot be treated as l-values; hence cannot
4991 * be used as out or inout function parameters, nor can they be
4994 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4995 && type
->contains_opaque()) {
4996 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
4997 "contain opaque variables");
4998 type
= glsl_type::error_type
;
5001 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5003 * "When calling a function, expressions that do not evaluate to
5004 * l-values cannot be passed to parameters declared as out or inout."
5006 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5008 * "Other binary or unary expressions, non-dereferenced arrays,
5009 * function names, swizzles with repeated fields, and constants
5010 * cannot be l-values."
5012 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5013 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5015 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5017 && !state
->check_version(120, 100, &loc
,
5018 "arrays cannot be out or inout parameters")) {
5019 type
= glsl_type::error_type
;
5022 instructions
->push_tail(var
);
5024 /* Parameter declarations do not have r-values.
5031 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5033 exec_list
*ir_parameters
,
5034 _mesa_glsl_parse_state
*state
)
5036 ast_parameter_declarator
*void_param
= NULL
;
5039 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5040 param
->formal_parameter
= formal
;
5041 param
->hir(ir_parameters
, state
);
5049 if ((void_param
!= NULL
) && (count
> 1)) {
5050 YYLTYPE loc
= void_param
->get_location();
5052 _mesa_glsl_error(& loc
, state
,
5053 "`void' parameter must be only parameter");
5059 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5061 /* IR invariants disallow function declarations or definitions
5062 * nested within other function definitions. But there is no
5063 * requirement about the relative order of function declarations
5064 * and definitions with respect to one another. So simply insert
5065 * the new ir_function block at the end of the toplevel instruction
5068 state
->toplevel_ir
->push_tail(f
);
5073 ast_function::hir(exec_list
*instructions
,
5074 struct _mesa_glsl_parse_state
*state
)
5077 ir_function
*f
= NULL
;
5078 ir_function_signature
*sig
= NULL
;
5079 exec_list hir_parameters
;
5080 YYLTYPE loc
= this->get_location();
5082 const char *const name
= identifier
;
5084 /* New functions are always added to the top-level IR instruction stream,
5085 * so this instruction list pointer is ignored. See also emit_function
5088 (void) instructions
;
5090 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5092 * "Function declarations (prototypes) cannot occur inside of functions;
5093 * they must be at global scope, or for the built-in functions, outside
5094 * the global scope."
5096 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5098 * "User defined functions may only be defined within the global scope."
5100 * Note that this language does not appear in GLSL 1.10.
5102 if ((state
->current_function
!= NULL
) &&
5103 state
->is_version(120, 100)) {
5104 YYLTYPE loc
= this->get_location();
5105 _mesa_glsl_error(&loc
, state
,
5106 "declaration of function `%s' not allowed within "
5107 "function body", name
);
5110 validate_identifier(name
, this->get_location(), state
);
5112 /* Convert the list of function parameters to HIR now so that they can be
5113 * used below to compare this function's signature with previously seen
5114 * signatures for functions with the same name.
5116 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5118 & hir_parameters
, state
);
5120 const char *return_type_name
;
5121 const glsl_type
*return_type
=
5122 this->return_type
->glsl_type(& return_type_name
, state
);
5125 YYLTYPE loc
= this->get_location();
5126 _mesa_glsl_error(&loc
, state
,
5127 "function `%s' has undeclared return type `%s'",
5128 name
, return_type_name
);
5129 return_type
= glsl_type::error_type
;
5132 /* ARB_shader_subroutine states:
5133 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5134 * subroutine(...) to a function declaration."
5136 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5137 YYLTYPE loc
= this->get_location();
5138 _mesa_glsl_error(&loc
, state
,
5139 "function declaration `%s' cannot have subroutine prepended",
5143 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5144 * "No qualifier is allowed on the return type of a function."
5146 if (this->return_type
->has_qualifiers(state
)) {
5147 YYLTYPE loc
= this->get_location();
5148 _mesa_glsl_error(& loc
, state
,
5149 "function `%s' return type has qualifiers", name
);
5152 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5154 * "Arrays are allowed as arguments and as the return type. In both
5155 * cases, the array must be explicitly sized."
5157 if (return_type
->is_unsized_array()) {
5158 YYLTYPE loc
= this->get_location();
5159 _mesa_glsl_error(& loc
, state
,
5160 "function `%s' return type array must be explicitly "
5164 /* From section 4.1.7 of the GLSL 4.40 spec:
5166 * "[Opaque types] can only be declared as function parameters
5167 * or uniform-qualified variables."
5169 if (return_type
->contains_opaque()) {
5170 YYLTYPE loc
= this->get_location();
5171 _mesa_glsl_error(&loc
, state
,
5172 "function `%s' return type can't contain an opaque type",
5176 /* Create an ir_function if one doesn't already exist. */
5177 f
= state
->symbols
->get_function(name
);
5179 f
= new(ctx
) ir_function(name
);
5180 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5181 if (!state
->symbols
->add_function(f
)) {
5182 /* This function name shadows a non-function use of the same name. */
5183 YYLTYPE loc
= this->get_location();
5184 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5185 "non-function", name
);
5189 emit_function(state
, f
);
5192 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5194 * "A shader cannot redefine or overload built-in functions."
5196 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5198 * "User code can overload the built-in functions but cannot redefine
5201 if (state
->es_shader
&& state
->language_version
>= 300) {
5202 /* Local shader has no exact candidates; check the built-ins. */
5203 _mesa_glsl_initialize_builtin_functions();
5204 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5205 YYLTYPE loc
= this->get_location();
5206 _mesa_glsl_error(& loc
, state
,
5207 "A shader cannot redefine or overload built-in "
5208 "function `%s' in GLSL ES 3.00", name
);
5213 /* Verify that this function's signature either doesn't match a previously
5214 * seen signature for a function with the same name, or, if a match is found,
5215 * that the previously seen signature does not have an associated definition.
5217 if (state
->es_shader
|| f
->has_user_signature()) {
5218 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5220 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5221 if (badvar
!= NULL
) {
5222 YYLTYPE loc
= this->get_location();
5224 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5225 "qualifiers don't match prototype", name
, badvar
);
5228 if (sig
->return_type
!= return_type
) {
5229 YYLTYPE loc
= this->get_location();
5231 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5232 "match prototype", name
);
5235 if (sig
->is_defined
) {
5236 if (is_definition
) {
5237 YYLTYPE loc
= this->get_location();
5238 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5240 /* We just encountered a prototype that exactly matches a
5241 * function that's already been defined. This is redundant,
5242 * and we should ignore it.
5250 /* Verify the return type of main() */
5251 if (strcmp(name
, "main") == 0) {
5252 if (! return_type
->is_void()) {
5253 YYLTYPE loc
= this->get_location();
5255 _mesa_glsl_error(& loc
, state
, "main() must return void");
5258 if (!hir_parameters
.is_empty()) {
5259 YYLTYPE loc
= this->get_location();
5261 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5265 /* Finish storing the information about this new function in its signature.
5268 sig
= new(ctx
) ir_function_signature(return_type
);
5269 f
->add_signature(sig
);
5272 sig
->replace_parameters(&hir_parameters
);
5275 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5278 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5279 unsigned qual_index
;
5280 if (process_qualifier_constant(state
, &loc
, "index",
5281 this->return_type
->qualifier
.index
,
5283 if (!state
->has_explicit_uniform_location()) {
5284 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5285 "GL_ARB_explicit_uniform_location or "
5287 } else if (qual_index
>= MAX_SUBROUTINES
) {
5288 _mesa_glsl_error(&loc
, state
,
5289 "invalid subroutine index (%d) index must "
5290 "be a number between 0 and "
5291 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5292 MAX_SUBROUTINES
- 1);
5294 f
->subroutine_index
= qual_index
;
5299 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5300 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5301 f
->num_subroutine_types
);
5303 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5304 const struct glsl_type
*type
;
5305 /* the subroutine type must be already declared */
5306 type
= state
->symbols
->get_type(decl
->identifier
);
5308 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5310 f
->subroutine_types
[idx
++] = type
;
5312 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5314 state
->num_subroutines
+ 1);
5315 state
->subroutines
[state
->num_subroutines
] = f
;
5316 state
->num_subroutines
++;
5320 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5321 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5322 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5325 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5327 state
->num_subroutine_types
+ 1);
5328 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5329 state
->num_subroutine_types
++;
5331 f
->is_subroutine
= true;
5334 /* Function declarations (prototypes) do not have r-values.
5341 ast_function_definition::hir(exec_list
*instructions
,
5342 struct _mesa_glsl_parse_state
*state
)
5344 prototype
->is_definition
= true;
5345 prototype
->hir(instructions
, state
);
5347 ir_function_signature
*signature
= prototype
->signature
;
5348 if (signature
== NULL
)
5351 assert(state
->current_function
== NULL
);
5352 state
->current_function
= signature
;
5353 state
->found_return
= false;
5355 /* Duplicate parameters declared in the prototype as concrete variables.
5356 * Add these to the symbol table.
5358 state
->symbols
->push_scope();
5359 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5360 assert(var
->as_variable() != NULL
);
5362 /* The only way a parameter would "exist" is if two parameters have
5365 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5366 YYLTYPE loc
= this->get_location();
5368 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5370 state
->symbols
->add_variable(var
);
5374 /* Convert the body of the function to HIR. */
5375 this->body
->hir(&signature
->body
, state
);
5376 signature
->is_defined
= true;
5378 state
->symbols
->pop_scope();
5380 assert(state
->current_function
== signature
);
5381 state
->current_function
= NULL
;
5383 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5384 YYLTYPE loc
= this->get_location();
5385 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5386 "%s, but no return statement",
5387 signature
->function_name(),
5388 signature
->return_type
->name
);
5391 /* Function definitions do not have r-values.
5398 ast_jump_statement::hir(exec_list
*instructions
,
5399 struct _mesa_glsl_parse_state
*state
)
5406 assert(state
->current_function
);
5408 if (opt_return_value
) {
5409 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5411 /* The value of the return type can be NULL if the shader says
5412 * 'return foo();' and foo() is a function that returns void.
5414 * NOTE: The GLSL spec doesn't say that this is an error. The type
5415 * of the return value is void. If the return type of the function is
5416 * also void, then this should compile without error. Seriously.
5418 const glsl_type
*const ret_type
=
5419 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5421 /* Implicit conversions are not allowed for return values prior to
5422 * ARB_shading_language_420pack.
5424 if (state
->current_function
->return_type
!= ret_type
) {
5425 YYLTYPE loc
= this->get_location();
5427 if (state
->has_420pack()) {
5428 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5430 _mesa_glsl_error(& loc
, state
,
5431 "could not implicitly convert return value "
5432 "to %s, in function `%s'",
5433 state
->current_function
->return_type
->name
,
5434 state
->current_function
->function_name());
5437 _mesa_glsl_error(& loc
, state
,
5438 "`return' with wrong type %s, in function `%s' "
5441 state
->current_function
->function_name(),
5442 state
->current_function
->return_type
->name
);
5444 } else if (state
->current_function
->return_type
->base_type
==
5446 YYLTYPE loc
= this->get_location();
5448 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5449 * specs add a clarification:
5451 * "A void function can only use return without a return argument, even if
5452 * the return argument has void type. Return statements only accept values:
5455 * void func2() { return func1(); } // illegal return statement"
5457 _mesa_glsl_error(& loc
, state
,
5458 "void functions can only use `return' without a "
5462 inst
= new(ctx
) ir_return(ret
);
5464 if (state
->current_function
->return_type
->base_type
!=
5466 YYLTYPE loc
= this->get_location();
5468 _mesa_glsl_error(& loc
, state
,
5469 "`return' with no value, in function %s returning "
5471 state
->current_function
->function_name());
5473 inst
= new(ctx
) ir_return
;
5476 state
->found_return
= true;
5477 instructions
->push_tail(inst
);
5482 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5483 YYLTYPE loc
= this->get_location();
5485 _mesa_glsl_error(& loc
, state
,
5486 "`discard' may only appear in a fragment shader");
5488 instructions
->push_tail(new(ctx
) ir_discard
);
5493 if (mode
== ast_continue
&&
5494 state
->loop_nesting_ast
== NULL
) {
5495 YYLTYPE loc
= this->get_location();
5497 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5498 } else if (mode
== ast_break
&&
5499 state
->loop_nesting_ast
== NULL
&&
5500 state
->switch_state
.switch_nesting_ast
== NULL
) {
5501 YYLTYPE loc
= this->get_location();
5503 _mesa_glsl_error(& loc
, state
,
5504 "break may only appear in a loop or a switch");
5506 /* For a loop, inline the for loop expression again, since we don't
5507 * know where near the end of the loop body the normal copy of it is
5508 * going to be placed. Same goes for the condition for a do-while
5511 if (state
->loop_nesting_ast
!= NULL
&&
5512 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5513 if (state
->loop_nesting_ast
->rest_expression
) {
5514 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5517 if (state
->loop_nesting_ast
->mode
==
5518 ast_iteration_statement::ast_do_while
) {
5519 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5523 if (state
->switch_state
.is_switch_innermost
&&
5524 mode
== ast_continue
) {
5525 /* Set 'continue_inside' to true. */
5526 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5527 ir_dereference_variable
*deref_continue_inside_var
=
5528 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5529 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5532 /* Break out from the switch, continue for the loop will
5533 * be called right after switch. */
5534 ir_loop_jump
*const jump
=
5535 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5536 instructions
->push_tail(jump
);
5538 } else if (state
->switch_state
.is_switch_innermost
&&
5539 mode
== ast_break
) {
5540 /* Force break out of switch by inserting a break. */
5541 ir_loop_jump
*const jump
=
5542 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5543 instructions
->push_tail(jump
);
5545 ir_loop_jump
*const jump
=
5546 new(ctx
) ir_loop_jump((mode
== ast_break
)
5547 ? ir_loop_jump::jump_break
5548 : ir_loop_jump::jump_continue
);
5549 instructions
->push_tail(jump
);
5556 /* Jump instructions do not have r-values.
5563 ast_selection_statement::hir(exec_list
*instructions
,
5564 struct _mesa_glsl_parse_state
*state
)
5568 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5570 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5572 * "Any expression whose type evaluates to a Boolean can be used as the
5573 * conditional expression bool-expression. Vector types are not accepted
5574 * as the expression to if."
5576 * The checks are separated so that higher quality diagnostics can be
5577 * generated for cases where both rules are violated.
5579 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5580 YYLTYPE loc
= this->condition
->get_location();
5582 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5586 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5588 if (then_statement
!= NULL
) {
5589 state
->symbols
->push_scope();
5590 then_statement
->hir(& stmt
->then_instructions
, state
);
5591 state
->symbols
->pop_scope();
5594 if (else_statement
!= NULL
) {
5595 state
->symbols
->push_scope();
5596 else_statement
->hir(& stmt
->else_instructions
, state
);
5597 state
->symbols
->pop_scope();
5600 instructions
->push_tail(stmt
);
5602 /* if-statements do not have r-values.
5609 ast_switch_statement::hir(exec_list
*instructions
,
5610 struct _mesa_glsl_parse_state
*state
)
5614 ir_rvalue
*const test_expression
=
5615 this->test_expression
->hir(instructions
, state
);
5617 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5619 * "The type of init-expression in a switch statement must be a
5622 if (!test_expression
->type
->is_scalar() ||
5623 !test_expression
->type
->is_integer()) {
5624 YYLTYPE loc
= this->test_expression
->get_location();
5626 _mesa_glsl_error(& loc
,
5628 "switch-statement expression must be scalar "
5632 /* Track the switch-statement nesting in a stack-like manner.
5634 struct glsl_switch_state saved
= state
->switch_state
;
5636 state
->switch_state
.is_switch_innermost
= true;
5637 state
->switch_state
.switch_nesting_ast
= this;
5638 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5639 hash_table_pointer_compare
);
5640 state
->switch_state
.previous_default
= NULL
;
5642 /* Initalize is_fallthru state to false.
5644 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5645 state
->switch_state
.is_fallthru_var
=
5646 new(ctx
) ir_variable(glsl_type::bool_type
,
5647 "switch_is_fallthru_tmp",
5649 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5651 ir_dereference_variable
*deref_is_fallthru_var
=
5652 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5653 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5656 /* Initialize continue_inside state to false.
5658 state
->switch_state
.continue_inside
=
5659 new(ctx
) ir_variable(glsl_type::bool_type
,
5660 "continue_inside_tmp",
5662 instructions
->push_tail(state
->switch_state
.continue_inside
);
5664 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5665 ir_dereference_variable
*deref_continue_inside_var
=
5666 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5667 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5670 state
->switch_state
.run_default
=
5671 new(ctx
) ir_variable(glsl_type::bool_type
,
5674 instructions
->push_tail(state
->switch_state
.run_default
);
5676 /* Loop around the switch is used for flow control. */
5677 ir_loop
* loop
= new(ctx
) ir_loop();
5678 instructions
->push_tail(loop
);
5680 /* Cache test expression.
5682 test_to_hir(&loop
->body_instructions
, state
);
5684 /* Emit code for body of switch stmt.
5686 body
->hir(&loop
->body_instructions
, state
);
5688 /* Insert a break at the end to exit loop. */
5689 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5690 loop
->body_instructions
.push_tail(jump
);
5692 /* If we are inside loop, check if continue got called inside switch. */
5693 if (state
->loop_nesting_ast
!= NULL
) {
5694 ir_dereference_variable
*deref_continue_inside
=
5695 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5696 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5697 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5699 if (state
->loop_nesting_ast
!= NULL
) {
5700 if (state
->loop_nesting_ast
->rest_expression
) {
5701 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5704 if (state
->loop_nesting_ast
->mode
==
5705 ast_iteration_statement::ast_do_while
) {
5706 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5709 irif
->then_instructions
.push_tail(jump
);
5710 instructions
->push_tail(irif
);
5713 hash_table_dtor(state
->switch_state
.labels_ht
);
5715 state
->switch_state
= saved
;
5717 /* Switch statements do not have r-values. */
5723 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5724 struct _mesa_glsl_parse_state
*state
)
5728 /* Cache value of test expression. */
5729 ir_rvalue
*const test_val
=
5730 test_expression
->hir(instructions
,
5733 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5736 ir_dereference_variable
*deref_test_var
=
5737 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5739 instructions
->push_tail(state
->switch_state
.test_var
);
5740 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5745 ast_switch_body::hir(exec_list
*instructions
,
5746 struct _mesa_glsl_parse_state
*state
)
5749 stmts
->hir(instructions
, state
);
5751 /* Switch bodies do not have r-values. */
5756 ast_case_statement_list::hir(exec_list
*instructions
,
5757 struct _mesa_glsl_parse_state
*state
)
5759 exec_list default_case
, after_default
, tmp
;
5761 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5762 case_stmt
->hir(&tmp
, state
);
5765 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5766 default_case
.append_list(&tmp
);
5770 /* If default case found, append 'after_default' list. */
5771 if (!default_case
.is_empty())
5772 after_default
.append_list(&tmp
);
5774 instructions
->append_list(&tmp
);
5777 /* Handle the default case. This is done here because default might not be
5778 * the last case. We need to add checks against following cases first to see
5779 * if default should be chosen or not.
5781 if (!default_case
.is_empty()) {
5783 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5784 ir_dereference_variable
*deref_run_default_var
=
5785 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5787 /* Choose to run default case initially, following conditional
5788 * assignments might change this.
5790 ir_assignment
*const init_var
=
5791 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5792 instructions
->push_tail(init_var
);
5794 /* Default case was the last one, no checks required. */
5795 if (after_default
.is_empty()) {
5796 instructions
->append_list(&default_case
);
5800 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5801 ir_assignment
*assign
= ir
->as_assignment();
5806 /* Clone the check between case label and init expression. */
5807 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5808 ir_expression
*clone
= exp
->clone(state
, NULL
);
5810 ir_dereference_variable
*deref_var
=
5811 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5812 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5814 ir_assignment
*const set_false
=
5815 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5817 instructions
->push_tail(set_false
);
5820 /* Append default case and all cases after it. */
5821 instructions
->append_list(&default_case
);
5822 instructions
->append_list(&after_default
);
5825 /* Case statements do not have r-values. */
5830 ast_case_statement::hir(exec_list
*instructions
,
5831 struct _mesa_glsl_parse_state
*state
)
5833 labels
->hir(instructions
, state
);
5835 /* Guard case statements depending on fallthru state. */
5836 ir_dereference_variable
*const deref_fallthru_guard
=
5837 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5838 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5840 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5841 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5843 instructions
->push_tail(test_fallthru
);
5845 /* Case statements do not have r-values. */
5851 ast_case_label_list::hir(exec_list
*instructions
,
5852 struct _mesa_glsl_parse_state
*state
)
5854 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5855 label
->hir(instructions
, state
);
5857 /* Case labels do not have r-values. */
5862 ast_case_label::hir(exec_list
*instructions
,
5863 struct _mesa_glsl_parse_state
*state
)
5867 ir_dereference_variable
*deref_fallthru_var
=
5868 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5870 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5872 /* If not default case, ... */
5873 if (this->test_value
!= NULL
) {
5874 /* Conditionally set fallthru state based on
5875 * comparison of cached test expression value to case label.
5877 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5878 ir_constant
*label_const
= label_rval
->constant_expression_value();
5881 YYLTYPE loc
= this->test_value
->get_location();
5883 _mesa_glsl_error(& loc
, state
,
5884 "switch statement case label must be a "
5885 "constant expression");
5887 /* Stuff a dummy value in to allow processing to continue. */
5888 label_const
= new(ctx
) ir_constant(0);
5890 ast_expression
*previous_label
= (ast_expression
*)
5891 hash_table_find(state
->switch_state
.labels_ht
,
5892 (void *)(uintptr_t)label_const
->value
.u
[0]);
5894 if (previous_label
) {
5895 YYLTYPE loc
= this->test_value
->get_location();
5896 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5898 loc
= previous_label
->get_location();
5899 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5901 hash_table_insert(state
->switch_state
.labels_ht
,
5903 (void *)(uintptr_t)label_const
->value
.u
[0]);
5907 ir_dereference_variable
*deref_test_var
=
5908 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5910 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5915 * From GLSL 4.40 specification section 6.2 ("Selection"):
5917 * "The type of the init-expression value in a switch statement must
5918 * be a scalar int or uint. The type of the constant-expression value
5919 * in a case label also must be a scalar int or uint. When any pair
5920 * of these values is tested for "equal value" and the types do not
5921 * match, an implicit conversion will be done to convert the int to a
5922 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5925 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5926 YYLTYPE loc
= this->test_value
->get_location();
5928 const glsl_type
*type_a
= label_const
->type
;
5929 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5931 /* Check if int->uint implicit conversion is supported. */
5932 bool integer_conversion_supported
=
5933 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5936 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5937 !integer_conversion_supported
) {
5938 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
5939 "init-expression and case label (%s != %s)",
5940 type_a
->name
, type_b
->name
);
5942 /* Conversion of the case label. */
5943 if (type_a
->base_type
== GLSL_TYPE_INT
) {
5944 if (!apply_implicit_conversion(glsl_type::uint_type
,
5945 test_cond
->operands
[0], state
))
5946 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5948 /* Conversion of the init-expression value. */
5949 if (!apply_implicit_conversion(glsl_type::uint_type
,
5950 test_cond
->operands
[1], state
))
5951 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5956 ir_assignment
*set_fallthru_on_test
=
5957 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5959 instructions
->push_tail(set_fallthru_on_test
);
5960 } else { /* default case */
5961 if (state
->switch_state
.previous_default
) {
5962 YYLTYPE loc
= this->get_location();
5963 _mesa_glsl_error(& loc
, state
,
5964 "multiple default labels in one switch");
5966 loc
= state
->switch_state
.previous_default
->get_location();
5967 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5969 state
->switch_state
.previous_default
= this;
5971 /* Set fallthru condition on 'run_default' bool. */
5972 ir_dereference_variable
*deref_run_default
=
5973 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5974 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5975 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5979 /* Set falltrhu state. */
5980 ir_assignment
*set_fallthru
=
5981 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5983 instructions
->push_tail(set_fallthru
);
5986 /* Case statements do not have r-values. */
5991 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
5992 struct _mesa_glsl_parse_state
*state
)
5996 if (condition
!= NULL
) {
5997 ir_rvalue
*const cond
=
5998 condition
->hir(instructions
, state
);
6001 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6002 YYLTYPE loc
= condition
->get_location();
6004 _mesa_glsl_error(& loc
, state
,
6005 "loop condition must be scalar boolean");
6007 /* As the first code in the loop body, generate a block that looks
6008 * like 'if (!condition) break;' as the loop termination condition.
6010 ir_rvalue
*const not_cond
=
6011 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6013 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6015 ir_jump
*const break_stmt
=
6016 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6018 if_stmt
->then_instructions
.push_tail(break_stmt
);
6019 instructions
->push_tail(if_stmt
);
6026 ast_iteration_statement::hir(exec_list
*instructions
,
6027 struct _mesa_glsl_parse_state
*state
)
6031 /* For-loops and while-loops start a new scope, but do-while loops do not.
6033 if (mode
!= ast_do_while
)
6034 state
->symbols
->push_scope();
6036 if (init_statement
!= NULL
)
6037 init_statement
->hir(instructions
, state
);
6039 ir_loop
*const stmt
= new(ctx
) ir_loop();
6040 instructions
->push_tail(stmt
);
6042 /* Track the current loop nesting. */
6043 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6045 state
->loop_nesting_ast
= this;
6047 /* Likewise, indicate that following code is closest to a loop,
6048 * NOT closest to a switch.
6050 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6051 state
->switch_state
.is_switch_innermost
= false;
6053 if (mode
!= ast_do_while
)
6054 condition_to_hir(&stmt
->body_instructions
, state
);
6057 body
->hir(& stmt
->body_instructions
, state
);
6059 if (rest_expression
!= NULL
)
6060 rest_expression
->hir(& stmt
->body_instructions
, state
);
6062 if (mode
== ast_do_while
)
6063 condition_to_hir(&stmt
->body_instructions
, state
);
6065 if (mode
!= ast_do_while
)
6066 state
->symbols
->pop_scope();
6068 /* Restore previous nesting before returning. */
6069 state
->loop_nesting_ast
= nesting_ast
;
6070 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6072 /* Loops do not have r-values.
6079 * Determine if the given type is valid for establishing a default precision
6082 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6084 * "The precision statement
6086 * precision precision-qualifier type;
6088 * can be used to establish a default precision qualifier. The type field
6089 * can be either int or float or any of the sampler types, and the
6090 * precision-qualifier can be lowp, mediump, or highp."
6092 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6093 * qualifiers on sampler types, but this seems like an oversight (since the
6094 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6095 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6099 is_valid_default_precision_type(const struct glsl_type
*const type
)
6104 switch (type
->base_type
) {
6106 case GLSL_TYPE_FLOAT
:
6107 /* "int" and "float" are valid, but vectors and matrices are not. */
6108 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6109 case GLSL_TYPE_SAMPLER
:
6110 case GLSL_TYPE_IMAGE
:
6111 case GLSL_TYPE_ATOMIC_UINT
:
6120 ast_type_specifier::hir(exec_list
*instructions
,
6121 struct _mesa_glsl_parse_state
*state
)
6123 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6126 YYLTYPE loc
= this->get_location();
6128 /* If this is a precision statement, check that the type to which it is
6129 * applied is either float or int.
6131 * From section 4.5.3 of the GLSL 1.30 spec:
6132 * "The precision statement
6133 * precision precision-qualifier type;
6134 * can be used to establish a default precision qualifier. The type
6135 * field can be either int or float [...]. Any other types or
6136 * qualifiers will result in an error.
6138 if (this->default_precision
!= ast_precision_none
) {
6139 if (!state
->check_precision_qualifiers_allowed(&loc
))
6142 if (this->structure
!= NULL
) {
6143 _mesa_glsl_error(&loc
, state
,
6144 "precision qualifiers do not apply to structures");
6148 if (this->array_specifier
!= NULL
) {
6149 _mesa_glsl_error(&loc
, state
,
6150 "default precision statements do not apply to "
6155 const struct glsl_type
*const type
=
6156 state
->symbols
->get_type(this->type_name
);
6157 if (!is_valid_default_precision_type(type
)) {
6158 _mesa_glsl_error(&loc
, state
,
6159 "default precision statements apply only to "
6160 "float, int, and opaque types");
6164 if (state
->es_shader
) {
6165 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6168 * "Non-precision qualified declarations will use the precision
6169 * qualifier specified in the most recent precision statement
6170 * that is still in scope. The precision statement has the same
6171 * scoping rules as variable declarations. If it is declared
6172 * inside a compound statement, its effect stops at the end of
6173 * the innermost statement it was declared in. Precision
6174 * statements in nested scopes override precision statements in
6175 * outer scopes. Multiple precision statements for the same basic
6176 * type can appear inside the same scope, with later statements
6177 * overriding earlier statements within that scope."
6179 * Default precision specifications follow the same scope rules as
6180 * variables. So, we can track the state of the default precision
6181 * qualifiers in the symbol table, and the rules will just work. This
6182 * is a slight abuse of the symbol table, but it has the semantics
6185 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6186 this->default_precision
);
6189 /* FINISHME: Translate precision statements into IR. */
6193 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6194 * process_record_constructor() can do type-checking on C-style initializer
6195 * expressions of structs, but ast_struct_specifier should only be translated
6196 * to HIR if it is declaring the type of a structure.
6198 * The ->is_declaration field is false for initializers of variables
6199 * declared separately from the struct's type definition.
6201 * struct S { ... }; (is_declaration = true)
6202 * struct T { ... } t = { ... }; (is_declaration = true)
6203 * S s = { ... }; (is_declaration = false)
6205 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6206 return this->structure
->hir(instructions
, state
);
6213 * Process a structure or interface block tree into an array of structure fields
6215 * After parsing, where there are some syntax differnces, structures and
6216 * interface blocks are almost identical. They are similar enough that the
6217 * AST for each can be processed the same way into a set of
6218 * \c glsl_struct_field to describe the members.
6220 * If we're processing an interface block, var_mode should be the type of the
6221 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6222 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6226 * The number of fields processed. A pointer to the array structure fields is
6227 * stored in \c *fields_ret.
6230 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6231 struct _mesa_glsl_parse_state
*state
,
6232 exec_list
*declarations
,
6233 glsl_struct_field
**fields_ret
,
6235 enum glsl_matrix_layout matrix_layout
,
6236 bool allow_reserved_names
,
6237 ir_variable_mode var_mode
,
6238 ast_type_qualifier
*layout
,
6239 unsigned block_stream
,
6240 unsigned expl_location
)
6242 unsigned decl_count
= 0;
6244 /* Make an initial pass over the list of fields to determine how
6245 * many there are. Each element in this list is an ast_declarator_list.
6246 * This means that we actually need to count the number of elements in the
6247 * 'declarations' list in each of the elements.
6249 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6250 decl_count
+= decl_list
->declarations
.length();
6253 /* Allocate storage for the fields and process the field
6254 * declarations. As the declarations are processed, try to also convert
6255 * the types to HIR. This ensures that structure definitions embedded in
6256 * other structure definitions or in interface blocks are processed.
6258 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6261 bool first_member
= true;
6262 bool first_member_has_explicit_location
;
6265 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6266 const char *type_name
;
6267 YYLTYPE loc
= decl_list
->get_location();
6269 decl_list
->type
->specifier
->hir(instructions
, state
);
6271 /* Section 10.9 of the GLSL ES 1.00 specification states that
6272 * embedded structure definitions have been removed from the language.
6274 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
6275 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
6276 "not allowed in GLSL ES 1.00");
6279 const glsl_type
*decl_type
=
6280 decl_list
->type
->glsl_type(& type_name
, state
);
6282 const struct ast_type_qualifier
*const qual
=
6283 &decl_list
->type
->qualifier
;
6285 /* From section 4.3.9 of the GLSL 4.40 spec:
6287 * "[In interface blocks] opaque types are not allowed."
6289 * It should be impossible for decl_type to be NULL here. Cases that
6290 * might naturally lead to decl_type being NULL, especially for the
6291 * is_interface case, will have resulted in compilation having
6292 * already halted due to a syntax error.
6296 if (is_interface
&& decl_type
->contains_opaque()) {
6297 _mesa_glsl_error(&loc
, state
,
6298 "uniform/buffer in non-default interface block contains "
6302 if (decl_type
->contains_atomic()) {
6303 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6305 * "Members of structures cannot be declared as atomic counter
6308 _mesa_glsl_error(&loc
, state
, "atomic counter in structure, "
6309 "shader storage block or uniform block");
6312 if (decl_type
->contains_image()) {
6313 /* FINISHME: Same problem as with atomic counters.
6314 * FINISHME: Request clarification from Khronos and add
6315 * FINISHME: spec quotation here.
6317 _mesa_glsl_error(&loc
, state
,
6318 "image in structure, shader storage block or "
6322 if (qual
->flags
.q
.explicit_binding
) {
6323 _mesa_glsl_error(&loc
, state
,
6324 "binding layout qualifier cannot be applied "
6325 "to struct or interface block members");
6329 if (!first_member
) {
6330 if (!layout
->flags
.q
.explicit_location
&&
6331 ((first_member_has_explicit_location
&&
6332 !qual
->flags
.q
.explicit_location
) ||
6333 (!first_member_has_explicit_location
&&
6334 qual
->flags
.q
.explicit_location
))) {
6335 _mesa_glsl_error(&loc
, state
,
6336 "when block-level location layout qualifier "
6337 "is not supplied either all members must "
6338 "have a location layout qualifier or all "
6339 "members must not have a location layout "
6343 first_member
= false;
6344 first_member_has_explicit_location
=
6345 qual
->flags
.q
.explicit_location
;
6349 if (qual
->flags
.q
.std140
||
6350 qual
->flags
.q
.std430
||
6351 qual
->flags
.q
.packed
||
6352 qual
->flags
.q
.shared
) {
6353 _mesa_glsl_error(&loc
, state
,
6354 "uniform/shader storage block layout qualifiers "
6355 "std140, std430, packed, and shared can only be "
6356 "applied to uniform/shader storage blocks, not "
6360 if (qual
->flags
.q
.constant
) {
6361 _mesa_glsl_error(&loc
, state
,
6362 "const storage qualifier cannot be applied "
6363 "to struct or interface block members");
6366 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6368 * "A block member may be declared with a stream identifier, but
6369 * the specified stream must match the stream associated with the
6370 * containing block."
6372 if (qual
->flags
.q
.explicit_stream
) {
6373 unsigned qual_stream
;
6374 if (process_qualifier_constant(state
, &loc
, "stream",
6375 qual
->stream
, &qual_stream
) &&
6376 qual_stream
!= block_stream
) {
6377 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6378 "interface block member does not match "
6379 "the interface block (%u vs %u)", qual_stream
,
6384 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6385 _mesa_glsl_error(&loc
, state
,
6386 "interpolation qualifiers cannot be used "
6387 "with uniform interface blocks");
6390 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6391 qual
->has_auxiliary_storage()) {
6392 _mesa_glsl_error(&loc
, state
,
6393 "auxiliary storage qualifiers cannot be used "
6394 "in uniform blocks or structures.");
6397 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6398 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6399 _mesa_glsl_error(&loc
, state
,
6400 "row_major and column_major can only be "
6401 "applied to interface blocks");
6403 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6406 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6407 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6408 "readonly and writeonly.");
6411 foreach_list_typed (ast_declaration
, decl
, link
,
6412 &decl_list
->declarations
) {
6413 YYLTYPE loc
= decl
->get_location();
6415 if (!allow_reserved_names
)
6416 validate_identifier(decl
->identifier
, loc
, state
);
6418 const struct glsl_type
*field_type
=
6419 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6420 validate_array_dimensions(field_type
, state
, &loc
);
6421 fields
[i
].type
= field_type
;
6422 fields
[i
].name
= decl
->identifier
;
6423 fields
[i
].interpolation
=
6424 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
6425 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6426 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6427 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6428 fields
[i
].precision
= qual
->precision
;
6430 if (qual
->flags
.q
.explicit_location
) {
6431 unsigned qual_location
;
6432 if (process_qualifier_constant(state
, &loc
, "location",
6433 qual
->location
, &qual_location
)) {
6434 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6435 expl_location
= fields
[i
].location
+
6436 fields
[i
].type
->count_attribute_slots(false);
6439 if (layout
&& layout
->flags
.q
.explicit_location
) {
6440 fields
[i
].location
= expl_location
;
6441 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6443 fields
[i
].location
= -1;
6447 /* Propogate row- / column-major information down the fields of the
6448 * structure or interface block. Structures need this data because
6449 * the structure may contain a structure that contains ... a matrix
6450 * that need the proper layout.
6452 if (field_type
->without_array()->is_matrix()
6453 || field_type
->without_array()->is_record()) {
6454 /* If no layout is specified for the field, inherit the layout
6457 fields
[i
].matrix_layout
= matrix_layout
;
6459 if (qual
->flags
.q
.row_major
)
6460 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6461 else if (qual
->flags
.q
.column_major
)
6462 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6464 /* If we're processing an interface block, the matrix layout must
6465 * be decided by this point.
6467 assert(!is_interface
6468 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6469 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6472 /* Image qualifiers are allowed on buffer variables, which can only
6473 * be defined inside shader storage buffer objects
6475 if (layout
&& var_mode
== ir_var_shader_storage
) {
6476 /* For readonly and writeonly qualifiers the field definition,
6477 * if set, overwrites the layout qualifier.
6479 if (qual
->flags
.q
.read_only
) {
6480 fields
[i
].image_read_only
= true;
6481 fields
[i
].image_write_only
= false;
6482 } else if (qual
->flags
.q
.write_only
) {
6483 fields
[i
].image_read_only
= false;
6484 fields
[i
].image_write_only
= true;
6486 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6487 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6490 /* For other qualifiers, we set the flag if either the layout
6491 * qualifier or the field qualifier are set
6493 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6494 layout
->flags
.q
.coherent
;
6495 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6496 layout
->flags
.q
._volatile
;
6497 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6498 layout
->flags
.q
.restrict_flag
;
6505 assert(i
== decl_count
);
6507 *fields_ret
= fields
;
6513 ast_struct_specifier::hir(exec_list
*instructions
,
6514 struct _mesa_glsl_parse_state
*state
)
6516 YYLTYPE loc
= this->get_location();
6518 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6520 * "Anonymous structures are not supported; so embedded structures must
6521 * have a declarator. A name given to an embedded struct is scoped at
6522 * the same level as the struct it is embedded in."
6524 * The same section of the GLSL 1.20 spec says:
6526 * "Anonymous structures are not supported. Embedded structures are not
6529 * struct S { float f; };
6531 * S; // Error: anonymous structures disallowed
6532 * struct { ... }; // Error: embedded structures disallowed
6533 * S s; // Okay: nested structures with name are allowed
6536 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
6537 * we allow embedded structures in 1.10 only.
6539 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
6540 _mesa_glsl_error(&loc
, state
,
6541 "embedded structure declarations are not allowed");
6543 state
->struct_specifier_depth
++;
6545 unsigned expl_location
= 0;
6546 if (layout
&& layout
->flags
.q
.explicit_location
) {
6547 if (!process_qualifier_constant(state
, &loc
, "location",
6548 layout
->location
, &expl_location
)) {
6551 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6555 glsl_struct_field
*fields
;
6556 unsigned decl_count
=
6557 ast_process_struct_or_iface_block_members(instructions
,
6559 &this->declarations
,
6562 GLSL_MATRIX_LAYOUT_INHERITED
,
6563 false /* allow_reserved_names */,
6566 0, /* for interface only */
6569 validate_identifier(this->name
, loc
, state
);
6571 const glsl_type
*t
=
6572 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6574 if (!state
->symbols
->add_type(name
, t
)) {
6575 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6577 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6579 state
->num_user_structures
+ 1);
6581 s
[state
->num_user_structures
] = t
;
6582 state
->user_structures
= s
;
6583 state
->num_user_structures
++;
6587 state
->struct_specifier_depth
--;
6589 /* Structure type definitions do not have r-values.
6596 * Visitor class which detects whether a given interface block has been used.
6598 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6601 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6602 : mode(mode
), block(block
), found(false)
6606 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6608 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6612 return visit_continue
;
6615 bool usage_found() const
6621 ir_variable_mode mode
;
6622 const glsl_type
*block
;
6627 is_unsized_array_last_element(ir_variable
*v
)
6629 const glsl_type
*interface_type
= v
->get_interface_type();
6630 int length
= interface_type
->length
;
6632 assert(v
->type
->is_unsized_array());
6634 /* Check if it is the last element of the interface */
6635 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6641 ast_interface_block::hir(exec_list
*instructions
,
6642 struct _mesa_glsl_parse_state
*state
)
6644 YYLTYPE loc
= this->get_location();
6646 /* Interface blocks must be declared at global scope */
6647 if (state
->current_function
!= NULL
) {
6648 _mesa_glsl_error(&loc
, state
,
6649 "Interface block `%s' must be declared "
6654 if (!this->layout
.flags
.q
.buffer
&&
6655 this->layout
.flags
.q
.std430
) {
6656 _mesa_glsl_error(&loc
, state
,
6657 "std430 storage block layout qualifier is supported "
6658 "only for shader storage blocks");
6661 /* The ast_interface_block has a list of ast_declarator_lists. We
6662 * need to turn those into ir_variables with an association
6663 * with this uniform block.
6665 enum glsl_interface_packing packing
;
6666 if (this->layout
.flags
.q
.shared
) {
6667 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6668 } else if (this->layout
.flags
.q
.packed
) {
6669 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6670 } else if (this->layout
.flags
.q
.std430
) {
6671 packing
= GLSL_INTERFACE_PACKING_STD430
;
6673 /* The default layout is std140.
6675 packing
= GLSL_INTERFACE_PACKING_STD140
;
6678 ir_variable_mode var_mode
;
6679 const char *iface_type_name
;
6680 if (this->layout
.flags
.q
.in
) {
6681 var_mode
= ir_var_shader_in
;
6682 iface_type_name
= "in";
6683 } else if (this->layout
.flags
.q
.out
) {
6684 var_mode
= ir_var_shader_out
;
6685 iface_type_name
= "out";
6686 } else if (this->layout
.flags
.q
.uniform
) {
6687 var_mode
= ir_var_uniform
;
6688 iface_type_name
= "uniform";
6689 } else if (this->layout
.flags
.q
.buffer
) {
6690 var_mode
= ir_var_shader_storage
;
6691 iface_type_name
= "buffer";
6693 var_mode
= ir_var_auto
;
6694 iface_type_name
= "UNKNOWN";
6695 assert(!"interface block layout qualifier not found!");
6698 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6699 if (this->layout
.flags
.q
.row_major
)
6700 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6701 else if (this->layout
.flags
.q
.column_major
)
6702 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6704 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6705 exec_list declared_variables
;
6706 glsl_struct_field
*fields
;
6708 /* Treat an interface block as one level of nesting, so that embedded struct
6709 * specifiers will be disallowed.
6711 state
->struct_specifier_depth
++;
6713 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
6714 * that we don't have incompatible qualifiers
6716 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
6717 _mesa_glsl_error(&loc
, state
,
6718 "Interface block sets both readonly and writeonly");
6721 unsigned qual_stream
;
6722 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
6724 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
6725 /* If the stream qualifier is invalid it doesn't make sense to continue
6726 * on and try to compare stream layouts on member variables against it
6727 * so just return early.
6732 unsigned expl_location
= 0;
6733 if (layout
.flags
.q
.explicit_location
) {
6734 if (!process_qualifier_constant(state
, &loc
, "location",
6735 layout
.location
, &expl_location
)) {
6738 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6742 unsigned int num_variables
=
6743 ast_process_struct_or_iface_block_members(&declared_variables
,
6745 &this->declarations
,
6749 redeclaring_per_vertex
,
6755 state
->struct_specifier_depth
--;
6757 if (!redeclaring_per_vertex
) {
6758 validate_identifier(this->block_name
, loc
, state
);
6760 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
6762 * "Block names have no other use within a shader beyond interface
6763 * matching; it is a compile-time error to use a block name at global
6764 * scope for anything other than as a block name."
6766 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
6767 if (var
&& !var
->type
->is_interface()) {
6768 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
6769 "already used in the scope.",
6774 const glsl_type
*earlier_per_vertex
= NULL
;
6775 if (redeclaring_per_vertex
) {
6776 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
6777 * the named interface block gl_in, we can find it by looking at the
6778 * previous declaration of gl_in. Otherwise we can find it by looking
6779 * at the previous decalartion of any of the built-in outputs,
6782 * Also check that the instance name and array-ness of the redeclaration
6786 case ir_var_shader_in
:
6787 if (ir_variable
*earlier_gl_in
=
6788 state
->symbols
->get_variable("gl_in")) {
6789 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6791 _mesa_glsl_error(&loc
, state
,
6792 "redeclaration of gl_PerVertex input not allowed "
6794 _mesa_shader_stage_to_string(state
->stage
));
6796 if (this->instance_name
== NULL
||
6797 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
6798 !this->array_specifier
->is_single_dimension()) {
6799 _mesa_glsl_error(&loc
, state
,
6800 "gl_PerVertex input must be redeclared as "
6804 case ir_var_shader_out
:
6805 if (ir_variable
*earlier_gl_Position
=
6806 state
->symbols
->get_variable("gl_Position")) {
6807 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6808 } else if (ir_variable
*earlier_gl_out
=
6809 state
->symbols
->get_variable("gl_out")) {
6810 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6812 _mesa_glsl_error(&loc
, state
,
6813 "redeclaration of gl_PerVertex output not "
6814 "allowed in the %s shader",
6815 _mesa_shader_stage_to_string(state
->stage
));
6817 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6818 if (this->instance_name
== NULL
||
6819 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6820 _mesa_glsl_error(&loc
, state
,
6821 "gl_PerVertex output must be redeclared as "
6825 if (this->instance_name
!= NULL
) {
6826 _mesa_glsl_error(&loc
, state
,
6827 "gl_PerVertex output may not be redeclared with "
6828 "an instance name");
6833 _mesa_glsl_error(&loc
, state
,
6834 "gl_PerVertex must be declared as an input or an "
6839 if (earlier_per_vertex
== NULL
) {
6840 /* An error has already been reported. Bail out to avoid null
6841 * dereferences later in this function.
6846 /* Copy locations from the old gl_PerVertex interface block. */
6847 for (unsigned i
= 0; i
< num_variables
; i
++) {
6848 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6850 _mesa_glsl_error(&loc
, state
,
6851 "redeclaration of gl_PerVertex must be a subset "
6852 "of the built-in members of gl_PerVertex");
6854 fields
[i
].location
=
6855 earlier_per_vertex
->fields
.structure
[j
].location
;
6856 fields
[i
].interpolation
=
6857 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6858 fields
[i
].centroid
=
6859 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6861 earlier_per_vertex
->fields
.structure
[j
].sample
;
6863 earlier_per_vertex
->fields
.structure
[j
].patch
;
6864 fields
[i
].precision
=
6865 earlier_per_vertex
->fields
.structure
[j
].precision
;
6869 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
6872 * If a built-in interface block is redeclared, it must appear in
6873 * the shader before any use of any member included in the built-in
6874 * declaration, or a compilation error will result.
6876 * This appears to be a clarification to the behaviour established for
6877 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
6878 * regardless of GLSL version.
6880 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
6881 v
.run(instructions
);
6882 if (v
.usage_found()) {
6883 _mesa_glsl_error(&loc
, state
,
6884 "redeclaration of a built-in interface block must "
6885 "appear before any use of any member of the "
6890 const glsl_type
*block_type
=
6891 glsl_type::get_interface_instance(fields
,
6896 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
6897 YYLTYPE loc
= this->get_location();
6898 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
6899 "already taken in the current scope",
6900 this->block_name
, iface_type_name
);
6903 /* Since interface blocks cannot contain statements, it should be
6904 * impossible for the block to generate any instructions.
6906 assert(declared_variables
.is_empty());
6908 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
6910 * Geometry shader input variables get the per-vertex values written
6911 * out by vertex shader output variables of the same names. Since a
6912 * geometry shader operates on a set of vertices, each input varying
6913 * variable (or input block, see interface blocks below) needs to be
6914 * declared as an array.
6916 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
6917 var_mode
== ir_var_shader_in
) {
6918 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
6919 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6920 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
6921 this->array_specifier
== NULL
&&
6922 var_mode
== ir_var_shader_in
) {
6923 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
6924 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
6925 this->array_specifier
== NULL
&&
6926 var_mode
== ir_var_shader_out
) {
6927 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
6931 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
6934 * "If an instance name (instance-name) is used, then it puts all the
6935 * members inside a scope within its own name space, accessed with the
6936 * field selector ( . ) operator (analogously to structures)."
6938 if (this->instance_name
) {
6939 if (redeclaring_per_vertex
) {
6940 /* When a built-in in an unnamed interface block is redeclared,
6941 * get_variable_being_redeclared() calls
6942 * check_builtin_array_max_size() to make sure that built-in array
6943 * variables aren't redeclared to illegal sizes. But we're looking
6944 * at a redeclaration of a named built-in interface block. So we
6945 * have to manually call check_builtin_array_max_size() for all parts
6946 * of the interface that are arrays.
6948 for (unsigned i
= 0; i
< num_variables
; i
++) {
6949 if (fields
[i
].type
->is_array()) {
6950 const unsigned size
= fields
[i
].type
->array_size();
6951 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
6955 validate_identifier(this->instance_name
, loc
, state
);
6960 if (this->array_specifier
!= NULL
) {
6961 const glsl_type
*block_array_type
=
6962 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
6964 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
6966 * For uniform blocks declared an array, each individual array
6967 * element corresponds to a separate buffer object backing one
6968 * instance of the block. As the array size indicates the number
6969 * of buffer objects needed, uniform block array declarations
6970 * must specify an array size.
6972 * And a few paragraphs later:
6974 * Geometry shader input blocks must be declared as arrays and
6975 * follow the array declaration and linking rules for all
6976 * geometry shader inputs. All other input and output block
6977 * arrays must specify an array size.
6979 * The same applies to tessellation shaders.
6981 * The upshot of this is that the only circumstance where an
6982 * interface array size *doesn't* need to be specified is on a
6983 * geometry shader input, tessellation control shader input,
6984 * tessellation control shader output, and tessellation evaluation
6987 if (block_array_type
->is_unsized_array()) {
6988 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
6989 state
->stage
== MESA_SHADER_TESS_CTRL
||
6990 state
->stage
== MESA_SHADER_TESS_EVAL
;
6991 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
6993 if (this->layout
.flags
.q
.in
) {
6995 _mesa_glsl_error(&loc
, state
,
6996 "unsized input block arrays not allowed in "
6998 _mesa_shader_stage_to_string(state
->stage
));
6999 } else if (this->layout
.flags
.q
.out
) {
7001 _mesa_glsl_error(&loc
, state
,
7002 "unsized output block arrays not allowed in "
7004 _mesa_shader_stage_to_string(state
->stage
));
7006 /* by elimination, this is a uniform block array */
7007 _mesa_glsl_error(&loc
, state
,
7008 "unsized uniform block arrays not allowed in "
7010 _mesa_shader_stage_to_string(state
->stage
));
7014 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7016 * * Arrays of arrays of blocks are not allowed
7018 if (state
->es_shader
&& block_array_type
->is_array() &&
7019 block_array_type
->fields
.array
->is_array()) {
7020 _mesa_glsl_error(&loc
, state
,
7021 "arrays of arrays interface blocks are "
7025 var
= new(state
) ir_variable(block_array_type
,
7026 this->instance_name
,
7029 var
= new(state
) ir_variable(block_type
,
7030 this->instance_name
,
7034 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7035 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7037 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7038 var
->data
.read_only
= true;
7040 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7041 handle_geometry_shader_input_decl(state
, loc
, var
);
7042 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7043 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7044 handle_tess_shader_input_decl(state
, loc
, var
);
7045 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7046 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7048 for (unsigned i
= 0; i
< num_variables
; i
++) {
7049 if (fields
[i
].type
->is_unsized_array()) {
7050 if (var_mode
== ir_var_shader_storage
) {
7051 if (i
!= (num_variables
- 1)) {
7052 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7053 "only last member of a shader storage block "
7054 "can be defined as unsized array",
7058 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7060 * "If an array is declared as the last member of a shader storage
7061 * block and the size is not specified at compile-time, it is
7062 * sized at run-time. In all other cases, arrays are sized only
7065 if (state
->es_shader
) {
7066 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7067 "only last member of a shader storage block "
7068 "can be defined as unsized array",
7075 if (ir_variable
*earlier
=
7076 state
->symbols
->get_variable(this->instance_name
)) {
7077 if (!redeclaring_per_vertex
) {
7078 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7079 this->instance_name
);
7081 earlier
->data
.how_declared
= ir_var_declared_normally
;
7082 earlier
->type
= var
->type
;
7083 earlier
->reinit_interface_type(block_type
);
7086 if (this->layout
.flags
.q
.explicit_binding
) {
7087 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7091 var
->data
.stream
= qual_stream
;
7092 if (layout
.flags
.q
.explicit_location
) {
7093 var
->data
.location
= expl_location
;
7094 var
->data
.explicit_location
= true;
7097 state
->symbols
->add_variable(var
);
7098 instructions
->push_tail(var
);
7101 /* In order to have an array size, the block must also be declared with
7104 assert(this->array_specifier
== NULL
);
7106 for (unsigned i
= 0; i
< num_variables
; i
++) {
7108 new(state
) ir_variable(fields
[i
].type
,
7109 ralloc_strdup(state
, fields
[i
].name
),
7111 var
->data
.interpolation
= fields
[i
].interpolation
;
7112 var
->data
.centroid
= fields
[i
].centroid
;
7113 var
->data
.sample
= fields
[i
].sample
;
7114 var
->data
.patch
= fields
[i
].patch
;
7115 var
->data
.stream
= qual_stream
;
7116 var
->data
.location
= fields
[i
].location
;
7117 if (fields
[i
].location
!= -1)
7118 var
->data
.explicit_location
= true;
7119 var
->init_interface_type(block_type
);
7121 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7122 var
->data
.read_only
= true;
7124 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7125 if (state
->es_shader
) {
7126 var
->data
.precision
=
7127 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7131 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7132 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7133 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7135 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7138 if (var
->data
.mode
== ir_var_shader_storage
) {
7139 var
->data
.image_read_only
= fields
[i
].image_read_only
;
7140 var
->data
.image_write_only
= fields
[i
].image_write_only
;
7141 var
->data
.image_coherent
= fields
[i
].image_coherent
;
7142 var
->data
.image_volatile
= fields
[i
].image_volatile
;
7143 var
->data
.image_restrict
= fields
[i
].image_restrict
;
7146 /* Examine var name here since var may get deleted in the next call */
7147 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7149 if (redeclaring_per_vertex
) {
7150 ir_variable
*earlier
=
7151 get_variable_being_redeclared(var
, loc
, state
,
7152 true /* allow_all_redeclarations */);
7153 if (!var_is_gl_id
|| earlier
== NULL
) {
7154 _mesa_glsl_error(&loc
, state
,
7155 "redeclaration of gl_PerVertex can only "
7156 "include built-in variables");
7157 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7158 _mesa_glsl_error(&loc
, state
,
7159 "`%s' has already been redeclared",
7162 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7163 earlier
->reinit_interface_type(block_type
);
7168 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7169 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7171 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7172 * The UBO declaration itself doesn't get an ir_variable unless it
7173 * has an instance name. This is ugly.
7175 if (this->layout
.flags
.q
.explicit_binding
) {
7176 apply_explicit_binding(state
, &loc
, var
,
7177 var
->get_interface_type(), &this->layout
);
7180 if (var
->type
->is_unsized_array()) {
7181 if (var
->is_in_shader_storage_block()) {
7182 if (!is_unsized_array_last_element(var
)) {
7183 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7184 "only last member of a shader storage block "
7185 "can be defined as unsized array",
7188 var
->data
.from_ssbo_unsized_array
= true;
7190 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7192 * "If an array is declared as the last member of a shader storage
7193 * block and the size is not specified at compile-time, it is
7194 * sized at run-time. In all other cases, arrays are sized only
7197 if (state
->es_shader
) {
7198 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7199 "only last member of a shader storage block "
7200 "can be defined as unsized array",
7206 state
->symbols
->add_variable(var
);
7207 instructions
->push_tail(var
);
7210 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7211 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7213 * It is also a compilation error ... to redeclare a built-in
7214 * block and then use a member from that built-in block that was
7215 * not included in the redeclaration.
7217 * This appears to be a clarification to the behaviour established
7218 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7219 * behaviour regardless of GLSL version.
7221 * To prevent the shader from using a member that was not included in
7222 * the redeclaration, we disable any ir_variables that are still
7223 * associated with the old declaration of gl_PerVertex (since we've
7224 * already updated all of the variables contained in the new
7225 * gl_PerVertex to point to it).
7227 * As a side effect this will prevent
7228 * validate_intrastage_interface_blocks() from getting confused and
7229 * thinking there are conflicting definitions of gl_PerVertex in the
7232 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7233 ir_variable
*const var
= node
->as_variable();
7235 var
->get_interface_type() == earlier_per_vertex
&&
7236 var
->data
.mode
== var_mode
) {
7237 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7238 _mesa_glsl_error(&loc
, state
,
7239 "redeclaration of gl_PerVertex cannot "
7240 "follow a redeclaration of `%s'",
7243 state
->symbols
->disable_variable(var
->name
);
7255 ast_tcs_output_layout::hir(exec_list
*instructions
,
7256 struct _mesa_glsl_parse_state
*state
)
7258 YYLTYPE loc
= this->get_location();
7260 unsigned num_vertices
;
7261 if (!state
->out_qualifier
->vertices
->
7262 process_qualifier_constant(state
, "vertices", &num_vertices
,
7264 /* return here to stop cascading incorrect error messages */
7268 /* If any shader outputs occurred before this declaration and specified an
7269 * array size, make sure the size they specified is consistent with the
7272 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7273 _mesa_glsl_error(&loc
, state
,
7274 "this tessellation control shader output layout "
7275 "specifies %u vertices, but a previous output "
7276 "is declared with size %u",
7277 num_vertices
, state
->tcs_output_size
);
7281 state
->tcs_output_vertices_specified
= true;
7283 /* If any shader outputs occurred before this declaration and did not
7284 * specify an array size, their size is determined now.
7286 foreach_in_list (ir_instruction
, node
, instructions
) {
7287 ir_variable
*var
= node
->as_variable();
7288 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7291 /* Note: Not all tessellation control shader output are arrays. */
7292 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7295 if (var
->data
.max_array_access
>= num_vertices
) {
7296 _mesa_glsl_error(&loc
, state
,
7297 "this tessellation control shader output layout "
7298 "specifies %u vertices, but an access to element "
7299 "%u of output `%s' already exists", num_vertices
,
7300 var
->data
.max_array_access
, var
->name
);
7302 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7312 ast_gs_input_layout::hir(exec_list
*instructions
,
7313 struct _mesa_glsl_parse_state
*state
)
7315 YYLTYPE loc
= this->get_location();
7317 /* If any geometry input layout declaration preceded this one, make sure it
7318 * was consistent with this one.
7320 if (state
->gs_input_prim_type_specified
&&
7321 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7322 _mesa_glsl_error(&loc
, state
,
7323 "geometry shader input layout does not match"
7324 " previous declaration");
7328 /* If any shader inputs occurred before this declaration and specified an
7329 * array size, make sure the size they specified is consistent with the
7332 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7333 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7334 _mesa_glsl_error(&loc
, state
,
7335 "this geometry shader input layout implies %u vertices"
7336 " per primitive, but a previous input is declared"
7337 " with size %u", num_vertices
, state
->gs_input_size
);
7341 state
->gs_input_prim_type_specified
= true;
7343 /* If any shader inputs occurred before this declaration and did not
7344 * specify an array size, their size is determined now.
7346 foreach_in_list(ir_instruction
, node
, instructions
) {
7347 ir_variable
*var
= node
->as_variable();
7348 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7351 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7355 if (var
->type
->is_unsized_array()) {
7356 if (var
->data
.max_array_access
>= num_vertices
) {
7357 _mesa_glsl_error(&loc
, state
,
7358 "this geometry shader input layout implies %u"
7359 " vertices, but an access to element %u of input"
7360 " `%s' already exists", num_vertices
,
7361 var
->data
.max_array_access
, var
->name
);
7363 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7374 ast_cs_input_layout::hir(exec_list
*instructions
,
7375 struct _mesa_glsl_parse_state
*state
)
7377 YYLTYPE loc
= this->get_location();
7379 /* From the ARB_compute_shader specification:
7381 * If the local size of the shader in any dimension is greater
7382 * than the maximum size supported by the implementation for that
7383 * dimension, a compile-time error results.
7385 * It is not clear from the spec how the error should be reported if
7386 * the total size of the work group exceeds
7387 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7388 * report it at compile time as well.
7390 GLuint64 total_invocations
= 1;
7391 unsigned qual_local_size
[3];
7392 for (int i
= 0; i
< 3; i
++) {
7394 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7396 /* Infer a local_size of 1 for unspecified dimensions */
7397 if (this->local_size
[i
] == NULL
) {
7398 qual_local_size
[i
] = 1;
7399 } else if (!this->local_size
[i
]->
7400 process_qualifier_constant(state
, local_size_str
,
7401 &qual_local_size
[i
], false)) {
7402 ralloc_free(local_size_str
);
7405 ralloc_free(local_size_str
);
7407 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7408 _mesa_glsl_error(&loc
, state
,
7409 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7411 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7414 total_invocations
*= qual_local_size
[i
];
7415 if (total_invocations
>
7416 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7417 _mesa_glsl_error(&loc
, state
,
7418 "product of local_sizes exceeds "
7419 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7420 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7425 /* If any compute input layout declaration preceded this one, make sure it
7426 * was consistent with this one.
7428 if (state
->cs_input_local_size_specified
) {
7429 for (int i
= 0; i
< 3; i
++) {
7430 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7431 _mesa_glsl_error(&loc
, state
,
7432 "compute shader input layout does not match"
7433 " previous declaration");
7439 state
->cs_input_local_size_specified
= true;
7440 for (int i
= 0; i
< 3; i
++)
7441 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7443 /* We may now declare the built-in constant gl_WorkGroupSize (see
7444 * builtin_variable_generator::generate_constants() for why we didn't
7445 * declare it earlier).
7447 ir_variable
*var
= new(state
->symbols
)
7448 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7449 var
->data
.how_declared
= ir_var_declared_implicitly
;
7450 var
->data
.read_only
= true;
7451 instructions
->push_tail(var
);
7452 state
->symbols
->add_variable(var
);
7453 ir_constant_data data
;
7454 memset(&data
, 0, sizeof(data
));
7455 for (int i
= 0; i
< 3; i
++)
7456 data
.u
[i
] = qual_local_size
[i
];
7457 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7458 var
->constant_initializer
=
7459 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7460 var
->data
.has_initializer
= true;
7467 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7468 exec_list
*instructions
)
7470 bool gl_FragColor_assigned
= false;
7471 bool gl_FragData_assigned
= false;
7472 bool gl_FragSecondaryColor_assigned
= false;
7473 bool gl_FragSecondaryData_assigned
= false;
7474 bool user_defined_fs_output_assigned
= false;
7475 ir_variable
*user_defined_fs_output
= NULL
;
7477 /* It would be nice to have proper location information. */
7479 memset(&loc
, 0, sizeof(loc
));
7481 foreach_in_list(ir_instruction
, node
, instructions
) {
7482 ir_variable
*var
= node
->as_variable();
7484 if (!var
|| !var
->data
.assigned
)
7487 if (strcmp(var
->name
, "gl_FragColor") == 0)
7488 gl_FragColor_assigned
= true;
7489 else if (strcmp(var
->name
, "gl_FragData") == 0)
7490 gl_FragData_assigned
= true;
7491 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7492 gl_FragSecondaryColor_assigned
= true;
7493 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7494 gl_FragSecondaryData_assigned
= true;
7495 else if (!is_gl_identifier(var
->name
)) {
7496 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7497 var
->data
.mode
== ir_var_shader_out
) {
7498 user_defined_fs_output_assigned
= true;
7499 user_defined_fs_output
= var
;
7504 /* From the GLSL 1.30 spec:
7506 * "If a shader statically assigns a value to gl_FragColor, it
7507 * may not assign a value to any element of gl_FragData. If a
7508 * shader statically writes a value to any element of
7509 * gl_FragData, it may not assign a value to
7510 * gl_FragColor. That is, a shader may assign values to either
7511 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7512 * linked together must also consistently write just one of
7513 * these variables. Similarly, if user declared output
7514 * variables are in use (statically assigned to), then the
7515 * built-in variables gl_FragColor and gl_FragData may not be
7516 * assigned to. These incorrect usages all generate compile
7519 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7520 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7521 "`gl_FragColor' and `gl_FragData'");
7522 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7523 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7524 "`gl_FragColor' and `%s'",
7525 user_defined_fs_output
->name
);
7526 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7527 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7528 "`gl_FragSecondaryColorEXT' and"
7529 " `gl_FragSecondaryDataEXT'");
7530 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7531 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7532 "`gl_FragColor' and"
7533 " `gl_FragSecondaryDataEXT'");
7534 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7535 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7537 " `gl_FragSecondaryColorEXT'");
7538 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7539 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7540 "`gl_FragData' and `%s'",
7541 user_defined_fs_output
->name
);
7544 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7545 !state
->EXT_blend_func_extended_enable
) {
7546 _mesa_glsl_error(&loc
, state
,
7547 "Dual source blending requires EXT_blend_func_extended");
7553 remove_per_vertex_blocks(exec_list
*instructions
,
7554 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7556 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7557 * if it exists in this shader type.
7559 const glsl_type
*per_vertex
= NULL
;
7561 case ir_var_shader_in
:
7562 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7563 per_vertex
= gl_in
->get_interface_type();
7565 case ir_var_shader_out
:
7566 if (ir_variable
*gl_Position
=
7567 state
->symbols
->get_variable("gl_Position")) {
7568 per_vertex
= gl_Position
->get_interface_type();
7572 assert(!"Unexpected mode");
7576 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7577 * need to do anything.
7579 if (per_vertex
== NULL
)
7582 /* If the interface block is used by the shader, then we don't need to do
7585 interface_block_usage_visitor
v(mode
, per_vertex
);
7586 v
.run(instructions
);
7587 if (v
.usage_found())
7590 /* Remove any ir_variable declarations that refer to the interface block
7593 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7594 ir_variable
*const var
= node
->as_variable();
7595 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
7596 var
->data
.mode
== mode
) {
7597 state
->symbols
->disable_variable(var
->name
);