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_ATOMIC_UINT
:
1137 case GLSL_TYPE_SUBROUTINE
:
1138 case GLSL_TYPE_FUNCTION
:
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
->sampled_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
));
2753 } else if (state
->es_shader
&&
2754 ((mode
== ir_var_shader_in
&&
2755 state
->stage
!= MESA_SHADER_VERTEX
) ||
2756 (mode
== ir_var_shader_out
&&
2757 state
->stage
!= MESA_SHADER_FRAGMENT
))) {
2758 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
2760 * "When no interpolation qualifier is present, smooth interpolation
2763 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2766 return interpolation
;
2771 apply_explicit_location(const struct ast_type_qualifier
*qual
,
2773 struct _mesa_glsl_parse_state
*state
,
2778 unsigned qual_location
;
2779 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
2784 /* Checks for GL_ARB_explicit_uniform_location. */
2785 if (qual
->flags
.q
.uniform
) {
2786 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2789 const struct gl_context
*const ctx
= state
->ctx
;
2790 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
2792 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2793 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2794 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2795 ctx
->Const
.MaxUserAssignableUniformLocations
);
2799 var
->data
.explicit_location
= true;
2800 var
->data
.location
= qual_location
;
2804 /* Between GL_ARB_explicit_attrib_location an
2805 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2806 * stage can be assigned explicit locations. The checking here associates
2807 * the correct extension with the correct stage's input / output:
2811 * vertex explicit_loc sso
2812 * tess control sso sso
2815 * fragment sso explicit_loc
2817 switch (state
->stage
) {
2818 case MESA_SHADER_VERTEX
:
2819 if (var
->data
.mode
== ir_var_shader_in
) {
2820 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2826 if (var
->data
.mode
== ir_var_shader_out
) {
2827 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2836 case MESA_SHADER_TESS_CTRL
:
2837 case MESA_SHADER_TESS_EVAL
:
2838 case MESA_SHADER_GEOMETRY
:
2839 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2840 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2849 case MESA_SHADER_FRAGMENT
:
2850 if (var
->data
.mode
== ir_var_shader_in
) {
2851 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2857 if (var
->data
.mode
== ir_var_shader_out
) {
2858 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2867 case MESA_SHADER_COMPUTE
:
2868 _mesa_glsl_error(loc
, state
,
2869 "compute shader variables cannot be given "
2870 "explicit locations");
2875 _mesa_glsl_error(loc
, state
,
2876 "%s cannot be given an explicit location in %s shader",
2878 _mesa_shader_stage_to_string(state
->stage
));
2880 var
->data
.explicit_location
= true;
2882 switch (state
->stage
) {
2883 case MESA_SHADER_VERTEX
:
2884 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2885 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
2886 : (qual_location
+ VARYING_SLOT_VAR0
);
2889 case MESA_SHADER_TESS_CTRL
:
2890 case MESA_SHADER_TESS_EVAL
:
2891 case MESA_SHADER_GEOMETRY
:
2892 if (var
->data
.patch
)
2893 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
2895 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
2898 case MESA_SHADER_FRAGMENT
:
2899 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2900 ? (qual_location
+ FRAG_RESULT_DATA0
)
2901 : (qual_location
+ VARYING_SLOT_VAR0
);
2903 case MESA_SHADER_COMPUTE
:
2904 assert(!"Unexpected shader type");
2908 /* Check if index was set for the uniform instead of the function */
2909 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
2910 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
2911 "used with subroutine functions");
2915 unsigned qual_index
;
2916 if (qual
->flags
.q
.explicit_index
&&
2917 process_qualifier_constant(state
, loc
, "index", qual
->index
,
2919 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2920 * Layout Qualifiers):
2922 * "It is also a compile-time error if a fragment shader
2923 * sets a layout index to less than 0 or greater than 1."
2925 * Older specifications don't mandate a behavior; we take
2926 * this as a clarification and always generate the error.
2928 if (qual_index
> 1) {
2929 _mesa_glsl_error(loc
, state
,
2930 "explicit index may only be 0 or 1");
2932 var
->data
.explicit_index
= true;
2933 var
->data
.index
= qual_index
;
2940 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2942 struct _mesa_glsl_parse_state
*state
,
2945 const glsl_type
*base_type
= var
->type
->without_array();
2947 if (base_type
->is_image()) {
2948 if (var
->data
.mode
!= ir_var_uniform
&&
2949 var
->data
.mode
!= ir_var_function_in
) {
2950 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2951 "function parameters or uniform-qualified "
2952 "global variables");
2955 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2956 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2957 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2958 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2959 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2960 var
->data
.read_only
= true;
2962 if (qual
->flags
.q
.explicit_image_format
) {
2963 if (var
->data
.mode
== ir_var_function_in
) {
2964 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2965 "used on image function parameters");
2968 if (qual
->image_base_type
!= base_type
->sampled_type
) {
2969 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2970 "base data type of the image");
2973 var
->data
.image_format
= qual
->image_format
;
2975 if (var
->data
.mode
== ir_var_uniform
) {
2976 if (state
->es_shader
) {
2977 _mesa_glsl_error(loc
, state
, "all image uniforms "
2978 "must have a format layout qualifier");
2980 } else if (!qual
->flags
.q
.write_only
) {
2981 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
2982 "`writeonly' must have a format layout "
2987 var
->data
.image_format
= GL_NONE
;
2990 /* From page 70 of the GLSL ES 3.1 specification:
2992 * "Except for image variables qualified with the format qualifiers
2993 * r32f, r32i, and r32ui, image variables must specify either memory
2994 * qualifier readonly or the memory qualifier writeonly."
2996 if (state
->es_shader
&&
2997 var
->data
.image_format
!= GL_R32F
&&
2998 var
->data
.image_format
!= GL_R32I
&&
2999 var
->data
.image_format
!= GL_R32UI
&&
3000 !var
->data
.image_read_only
&&
3001 !var
->data
.image_write_only
) {
3002 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3003 "r32f, r32i or r32ui must be qualified `readonly' or "
3007 } else if (qual
->flags
.q
.read_only
||
3008 qual
->flags
.q
.write_only
||
3009 qual
->flags
.q
.coherent
||
3010 qual
->flags
.q
._volatile
||
3011 qual
->flags
.q
.restrict_flag
||
3012 qual
->flags
.q
.explicit_image_format
) {
3013 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3018 static inline const char*
3019 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3021 if (origin_upper_left
&& pixel_center_integer
)
3022 return "origin_upper_left, pixel_center_integer";
3023 else if (origin_upper_left
)
3024 return "origin_upper_left";
3025 else if (pixel_center_integer
)
3026 return "pixel_center_integer";
3032 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3033 const struct ast_type_qualifier
*qual
)
3035 /* If gl_FragCoord was previously declared, and the qualifiers were
3036 * different in any way, return true.
3038 if (state
->fs_redeclares_gl_fragcoord
) {
3039 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3040 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3047 validate_array_dimensions(const glsl_type
*t
,
3048 struct _mesa_glsl_parse_state
*state
,
3050 if (t
->is_array()) {
3051 t
= t
->fields
.array
;
3052 while (t
->is_array()) {
3053 if (t
->is_unsized_array()) {
3054 _mesa_glsl_error(loc
, state
,
3055 "only the outermost array dimension can "
3060 t
= t
->fields
.array
;
3066 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3068 struct _mesa_glsl_parse_state
*state
,
3071 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3073 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3075 * "Within any shader, the first redeclarations of gl_FragCoord
3076 * must appear before any use of gl_FragCoord."
3078 * Generate a compiler error if above condition is not met by the
3081 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3082 if (earlier
!= NULL
&&
3083 earlier
->data
.used
&&
3084 !state
->fs_redeclares_gl_fragcoord
) {
3085 _mesa_glsl_error(loc
, state
,
3086 "gl_FragCoord used before its first redeclaration "
3087 "in fragment shader");
3090 /* Make sure all gl_FragCoord redeclarations specify the same layout
3093 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3094 const char *const qual_string
=
3095 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3096 qual
->flags
.q
.pixel_center_integer
);
3098 const char *const state_string
=
3099 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3100 state
->fs_pixel_center_integer
);
3102 _mesa_glsl_error(loc
, state
,
3103 "gl_FragCoord redeclared with different layout "
3104 "qualifiers (%s) and (%s) ",
3108 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3109 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3110 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3111 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3112 state
->fs_redeclares_gl_fragcoord
=
3113 state
->fs_origin_upper_left
||
3114 state
->fs_pixel_center_integer
||
3115 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3118 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3119 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3120 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3121 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3122 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3123 ? "origin_upper_left" : "pixel_center_integer";
3125 _mesa_glsl_error(loc
, state
,
3126 "layout qualifier `%s' can only be applied to "
3127 "fragment shader input `gl_FragCoord'",
3131 if (qual
->flags
.q
.explicit_location
) {
3132 apply_explicit_location(qual
, var
, state
, loc
);
3133 } else if (qual
->flags
.q
.explicit_index
) {
3134 if (!qual
->flags
.q
.subroutine_def
)
3135 _mesa_glsl_error(loc
, state
,
3136 "explicit index requires explicit location");
3139 if (qual
->flags
.q
.explicit_binding
) {
3140 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3143 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3144 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3145 unsigned qual_stream
;
3146 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3148 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3149 var
->data
.stream
= qual_stream
;
3153 if (var
->type
->contains_atomic()) {
3154 if (var
->data
.mode
== ir_var_uniform
) {
3155 if (var
->data
.explicit_binding
) {
3157 &state
->atomic_counter_offsets
[var
->data
.binding
];
3159 if (*offset
% ATOMIC_COUNTER_SIZE
)
3160 _mesa_glsl_error(loc
, state
,
3161 "misaligned atomic counter offset");
3163 var
->data
.offset
= *offset
;
3164 *offset
+= var
->type
->atomic_size();
3167 _mesa_glsl_error(loc
, state
,
3168 "atomic counters require explicit binding point");
3170 } else if (var
->data
.mode
!= ir_var_function_in
) {
3171 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3172 "function parameters or uniform-qualified "
3173 "global variables");
3177 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3178 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3179 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3180 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3181 * These extensions and all following extensions that add the 'layout'
3182 * keyword have been modified to require the use of 'in' or 'out'.
3184 * The following extension do not allow the deprecated keywords:
3186 * GL_AMD_conservative_depth
3187 * GL_ARB_conservative_depth
3188 * GL_ARB_gpu_shader5
3189 * GL_ARB_separate_shader_objects
3190 * GL_ARB_tessellation_shader
3191 * GL_ARB_transform_feedback3
3192 * GL_ARB_uniform_buffer_object
3194 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3195 * allow layout with the deprecated keywords.
3197 const bool relaxed_layout_qualifier_checking
=
3198 state
->ARB_fragment_coord_conventions_enable
;
3200 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3201 || qual
->flags
.q
.varying
;
3202 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3203 if (relaxed_layout_qualifier_checking
) {
3204 _mesa_glsl_warning(loc
, state
,
3205 "`layout' qualifier may not be used with "
3206 "`attribute' or `varying'");
3208 _mesa_glsl_error(loc
, state
,
3209 "`layout' qualifier may not be used with "
3210 "`attribute' or `varying'");
3214 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3215 * AMD_conservative_depth.
3217 int depth_layout_count
= qual
->flags
.q
.depth_any
3218 + qual
->flags
.q
.depth_greater
3219 + qual
->flags
.q
.depth_less
3220 + qual
->flags
.q
.depth_unchanged
;
3221 if (depth_layout_count
> 0
3222 && !state
->AMD_conservative_depth_enable
3223 && !state
->ARB_conservative_depth_enable
) {
3224 _mesa_glsl_error(loc
, state
,
3225 "extension GL_AMD_conservative_depth or "
3226 "GL_ARB_conservative_depth must be enabled "
3227 "to use depth layout qualifiers");
3228 } else if (depth_layout_count
> 0
3229 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3230 _mesa_glsl_error(loc
, state
,
3231 "depth layout qualifiers can be applied only to "
3233 } else if (depth_layout_count
> 1
3234 && strcmp(var
->name
, "gl_FragDepth") == 0) {
3235 _mesa_glsl_error(loc
, state
,
3236 "at most one depth layout qualifier can be applied to "
3239 if (qual
->flags
.q
.depth_any
)
3240 var
->data
.depth_layout
= ir_depth_layout_any
;
3241 else if (qual
->flags
.q
.depth_greater
)
3242 var
->data
.depth_layout
= ir_depth_layout_greater
;
3243 else if (qual
->flags
.q
.depth_less
)
3244 var
->data
.depth_layout
= ir_depth_layout_less
;
3245 else if (qual
->flags
.q
.depth_unchanged
)
3246 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3248 var
->data
.depth_layout
= ir_depth_layout_none
;
3250 if (qual
->flags
.q
.std140
||
3251 qual
->flags
.q
.std430
||
3252 qual
->flags
.q
.packed
||
3253 qual
->flags
.q
.shared
) {
3254 _mesa_glsl_error(loc
, state
,
3255 "uniform and shader storage block layout qualifiers "
3256 "std140, std430, packed, and shared can only be "
3257 "applied to uniform or shader storage blocks, not "
3261 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3262 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3265 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3268 * "Fragment shaders also allow the following layout qualifier on in only
3269 * (not with variable declarations)
3270 * layout-qualifier-id
3271 * early_fragment_tests
3274 if (qual
->flags
.q
.early_fragment_tests
) {
3275 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3276 "valid in fragment shader input layout declaration.");
3281 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3283 struct _mesa_glsl_parse_state
*state
,
3287 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3289 if (qual
->flags
.q
.invariant
) {
3290 if (var
->data
.used
) {
3291 _mesa_glsl_error(loc
, state
,
3292 "variable `%s' may not be redeclared "
3293 "`invariant' after being used",
3296 var
->data
.invariant
= 1;
3300 if (qual
->flags
.q
.precise
) {
3301 if (var
->data
.used
) {
3302 _mesa_glsl_error(loc
, state
,
3303 "variable `%s' may not be redeclared "
3304 "`precise' after being used",
3307 var
->data
.precise
= 1;
3311 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3312 _mesa_glsl_error(loc
, state
,
3313 "`subroutine' may only be applied to uniforms, "
3314 "subroutine type declarations, or function definitions");
3317 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3318 || qual
->flags
.q
.uniform
3319 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3320 var
->data
.read_only
= 1;
3322 if (qual
->flags
.q
.centroid
)
3323 var
->data
.centroid
= 1;
3325 if (qual
->flags
.q
.sample
)
3326 var
->data
.sample
= 1;
3328 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3329 if (state
->es_shader
) {
3330 var
->data
.precision
=
3331 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3334 if (qual
->flags
.q
.patch
)
3335 var
->data
.patch
= 1;
3337 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3338 var
->type
= glsl_type::error_type
;
3339 _mesa_glsl_error(loc
, state
,
3340 "`attribute' variables may not be declared in the "
3342 _mesa_shader_stage_to_string(state
->stage
));
3345 /* Disallow layout qualifiers which may only appear on layout declarations. */
3346 if (qual
->flags
.q
.prim_type
) {
3347 _mesa_glsl_error(loc
, state
,
3348 "Primitive type may only be specified on GS input or output "
3349 "layout declaration, not on variables.");
3352 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3354 * "However, the const qualifier cannot be used with out or inout."
3356 * The same section of the GLSL 4.40 spec further clarifies this saying:
3358 * "The const qualifier cannot be used with out or inout, or a
3359 * compile-time error results."
3361 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3362 _mesa_glsl_error(loc
, state
,
3363 "`const' may not be applied to `out' or `inout' "
3364 "function parameters");
3367 /* If there is no qualifier that changes the mode of the variable, leave
3368 * the setting alone.
3370 assert(var
->data
.mode
!= ir_var_temporary
);
3371 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3372 var
->data
.mode
= ir_var_function_inout
;
3373 else if (qual
->flags
.q
.in
)
3374 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3375 else if (qual
->flags
.q
.attribute
3376 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3377 var
->data
.mode
= ir_var_shader_in
;
3378 else if (qual
->flags
.q
.out
)
3379 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3380 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3381 var
->data
.mode
= ir_var_shader_out
;
3382 else if (qual
->flags
.q
.uniform
)
3383 var
->data
.mode
= ir_var_uniform
;
3384 else if (qual
->flags
.q
.buffer
)
3385 var
->data
.mode
= ir_var_shader_storage
;
3386 else if (qual
->flags
.q
.shared_storage
)
3387 var
->data
.mode
= ir_var_shader_shared
;
3389 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3390 /* User-defined ins/outs are not permitted in compute shaders. */
3391 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3392 _mesa_glsl_error(loc
, state
,
3393 "user-defined input and output variables are not "
3394 "permitted in compute shaders");
3397 /* This variable is being used to link data between shader stages (in
3398 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3399 * that is allowed for such purposes.
3401 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3403 * "The varying qualifier can be used only with the data types
3404 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3407 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3408 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3410 * "Fragment inputs can only be signed and unsigned integers and
3411 * integer vectors, float, floating-point vectors, matrices, or
3412 * arrays of these. Structures cannot be input.
3414 * Similar text exists in the section on vertex shader outputs.
3416 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3417 * 3.00 spec allows structs as well. Varying structs are also allowed
3420 switch (var
->type
->get_scalar_type()->base_type
) {
3421 case GLSL_TYPE_FLOAT
:
3422 /* Ok in all GLSL versions */
3424 case GLSL_TYPE_UINT
:
3426 if (state
->is_version(130, 300))
3428 _mesa_glsl_error(loc
, state
,
3429 "varying variables must be of base type float in %s",
3430 state
->get_version_string());
3432 case GLSL_TYPE_STRUCT
:
3433 if (state
->is_version(150, 300))
3435 _mesa_glsl_error(loc
, state
,
3436 "varying variables may not be of type struct");
3438 case GLSL_TYPE_DOUBLE
:
3441 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3446 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3447 switch (state
->stage
) {
3448 case MESA_SHADER_VERTEX
:
3449 if (var
->data
.mode
== ir_var_shader_out
)
3450 var
->data
.invariant
= true;
3452 case MESA_SHADER_TESS_CTRL
:
3453 case MESA_SHADER_TESS_EVAL
:
3454 case MESA_SHADER_GEOMETRY
:
3455 if ((var
->data
.mode
== ir_var_shader_in
)
3456 || (var
->data
.mode
== ir_var_shader_out
))
3457 var
->data
.invariant
= true;
3459 case MESA_SHADER_FRAGMENT
:
3460 if (var
->data
.mode
== ir_var_shader_in
)
3461 var
->data
.invariant
= true;
3463 case MESA_SHADER_COMPUTE
:
3464 /* Invariance isn't meaningful in compute shaders. */
3469 var
->data
.interpolation
=
3470 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
3473 /* Does the declaration use the deprecated 'attribute' or 'varying'
3476 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3477 || qual
->flags
.q
.varying
;
3480 /* Validate auxiliary storage qualifiers */
3482 /* From section 4.3.4 of the GLSL 1.30 spec:
3483 * "It is an error to use centroid in in a vertex shader."
3485 * From section 4.3.4 of the GLSL ES 3.00 spec:
3486 * "It is an error to use centroid in or interpolation qualifiers in
3487 * a vertex shader input."
3490 /* Section 4.3.6 of the GLSL 1.30 specification states:
3491 * "It is an error to use centroid out in a fragment shader."
3493 * The GL_ARB_shading_language_420pack extension specification states:
3494 * "It is an error to use auxiliary storage qualifiers or interpolation
3495 * qualifiers on an output in a fragment shader."
3497 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3498 _mesa_glsl_error(loc
, state
,
3499 "sample qualifier may only be used on `in` or `out` "
3500 "variables between shader stages");
3502 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3503 _mesa_glsl_error(loc
, state
,
3504 "centroid qualifier may only be used with `in', "
3505 "`out' or `varying' variables between shader stages");
3508 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3509 _mesa_glsl_error(loc
, state
,
3510 "the shared storage qualifiers can only be used with "
3514 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3518 * Get the variable that is being redeclared by this declaration
3520 * Semantic checks to verify the validity of the redeclaration are also
3521 * performed. If semantic checks fail, compilation error will be emitted via
3522 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3525 * A pointer to an existing variable in the current scope if the declaration
3526 * is a redeclaration, \c NULL otherwise.
3528 static ir_variable
*
3529 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3530 struct _mesa_glsl_parse_state
*state
,
3531 bool allow_all_redeclarations
)
3533 /* Check if this declaration is actually a re-declaration, either to
3534 * resize an array or add qualifiers to an existing variable.
3536 * This is allowed for variables in the current scope, or when at
3537 * global scope (for built-ins in the implicit outer scope).
3539 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3540 if (earlier
== NULL
||
3541 (state
->current_function
!= NULL
&&
3542 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3547 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3549 * "It is legal to declare an array without a size and then
3550 * later re-declare the same name as an array of the same
3551 * type and specify a size."
3553 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3554 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3555 /* FINISHME: This doesn't match the qualifiers on the two
3556 * FINISHME: declarations. It's not 100% clear whether this is
3557 * FINISHME: required or not.
3560 const unsigned size
= unsigned(var
->type
->array_size());
3561 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3562 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3563 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3565 earlier
->data
.max_array_access
);
3568 earlier
->type
= var
->type
;
3571 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3572 state
->is_version(150, 0))
3573 && strcmp(var
->name
, "gl_FragCoord") == 0
3574 && earlier
->type
== var
->type
3575 && var
->data
.mode
== ir_var_shader_in
) {
3576 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3579 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3580 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3582 /* According to section 4.3.7 of the GLSL 1.30 spec,
3583 * the following built-in varaibles can be redeclared with an
3584 * interpolation qualifier:
3587 * * gl_FrontSecondaryColor
3588 * * gl_BackSecondaryColor
3590 * * gl_SecondaryColor
3592 } else if (state
->is_version(130, 0)
3593 && (strcmp(var
->name
, "gl_FrontColor") == 0
3594 || strcmp(var
->name
, "gl_BackColor") == 0
3595 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3596 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3597 || strcmp(var
->name
, "gl_Color") == 0
3598 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3599 && earlier
->type
== var
->type
3600 && earlier
->data
.mode
== var
->data
.mode
) {
3601 earlier
->data
.interpolation
= var
->data
.interpolation
;
3603 /* Layout qualifiers for gl_FragDepth. */
3604 } else if ((state
->AMD_conservative_depth_enable
||
3605 state
->ARB_conservative_depth_enable
)
3606 && strcmp(var
->name
, "gl_FragDepth") == 0
3607 && earlier
->type
== var
->type
3608 && earlier
->data
.mode
== var
->data
.mode
) {
3610 /** From the AMD_conservative_depth spec:
3611 * Within any shader, the first redeclarations of gl_FragDepth
3612 * must appear before any use of gl_FragDepth.
3614 if (earlier
->data
.used
) {
3615 _mesa_glsl_error(&loc
, state
,
3616 "the first redeclaration of gl_FragDepth "
3617 "must appear before any use of gl_FragDepth");
3620 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3621 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3622 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3623 _mesa_glsl_error(&loc
, state
,
3624 "gl_FragDepth: depth layout is declared here "
3625 "as '%s, but it was previously declared as "
3627 depth_layout_string(var
->data
.depth_layout
),
3628 depth_layout_string(earlier
->data
.depth_layout
));
3631 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3633 } else if (allow_all_redeclarations
) {
3634 if (earlier
->data
.mode
!= var
->data
.mode
) {
3635 _mesa_glsl_error(&loc
, state
,
3636 "redeclaration of `%s' with incorrect qualifiers",
3638 } else if (earlier
->type
!= var
->type
) {
3639 _mesa_glsl_error(&loc
, state
,
3640 "redeclaration of `%s' has incorrect type",
3644 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3651 * Generate the IR for an initializer in a variable declaration
3654 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3655 ast_fully_specified_type
*type
,
3656 exec_list
*initializer_instructions
,
3657 struct _mesa_glsl_parse_state
*state
)
3659 ir_rvalue
*result
= NULL
;
3661 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3663 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3665 * "All uniform variables are read-only and are initialized either
3666 * directly by an application via API commands, or indirectly by
3669 if (var
->data
.mode
== ir_var_uniform
) {
3670 state
->check_version(120, 0, &initializer_loc
,
3671 "cannot initialize uniform %s",
3675 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3677 * "Buffer variables cannot have initializers."
3679 if (var
->data
.mode
== ir_var_shader_storage
) {
3680 _mesa_glsl_error(&initializer_loc
, state
,
3681 "cannot initialize buffer variable %s",
3685 /* From section 4.1.7 of the GLSL 4.40 spec:
3687 * "Opaque variables [...] are initialized only through the
3688 * OpenGL API; they cannot be declared with an initializer in a
3691 if (var
->type
->contains_opaque()) {
3692 _mesa_glsl_error(&initializer_loc
, state
,
3693 "cannot initialize opaque variable %s",
3697 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3698 _mesa_glsl_error(&initializer_loc
, state
,
3699 "cannot initialize %s shader input / %s %s",
3700 _mesa_shader_stage_to_string(state
->stage
),
3701 (state
->stage
== MESA_SHADER_VERTEX
)
3702 ? "attribute" : "varying",
3706 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
3707 _mesa_glsl_error(&initializer_loc
, state
,
3708 "cannot initialize %s shader output %s",
3709 _mesa_shader_stage_to_string(state
->stage
),
3713 /* If the initializer is an ast_aggregate_initializer, recursively store
3714 * type information from the LHS into it, so that its hir() function can do
3717 if (decl
->initializer
->oper
== ast_aggregate
)
3718 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3720 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3721 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3723 /* Calculate the constant value if this is a const or uniform
3726 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
3728 * "Declarations of globals without a storage qualifier, or with
3729 * just the const qualifier, may include initializers, in which case
3730 * they will be initialized before the first line of main() is
3731 * executed. Such initializers must be a constant expression."
3733 * The same section of the GLSL ES 3.00.4 spec has similar language.
3735 if (type
->qualifier
.flags
.q
.constant
3736 || type
->qualifier
.flags
.q
.uniform
3737 || (state
->es_shader
&& state
->current_function
== NULL
)) {
3738 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3740 if (new_rhs
!= NULL
) {
3743 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
3746 * "A constant expression is one of
3750 * - an expression formed by an operator on operands that are
3751 * all constant expressions, including getting an element of
3752 * a constant array, or a field of a constant structure, or
3753 * components of a constant vector. However, the sequence
3754 * operator ( , ) and the assignment operators ( =, +=, ...)
3755 * are not included in the operators that can create a
3756 * constant expression."
3758 * Section 12.43 (Sequence operator and constant expressions) says:
3760 * "Should the following construct be allowed?
3764 * The expression within the brackets uses the sequence operator
3765 * (',') and returns the integer 3 so the construct is declaring
3766 * a single-dimensional array of size 3. In some languages, the
3767 * construct declares a two-dimensional array. It would be
3768 * preferable to make this construct illegal to avoid confusion.
3770 * One possibility is to change the definition of the sequence
3771 * operator so that it does not return a constant-expression and
3772 * hence cannot be used to declare an array size.
3774 * RESOLUTION: The result of a sequence operator is not a
3775 * constant-expression."
3777 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
3778 * contains language almost identical to the section 4.3.3 in the
3779 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
3782 ir_constant
*constant_value
= rhs
->constant_expression_value();
3783 if (!constant_value
||
3784 (state
->is_version(430, 300) &&
3785 decl
->initializer
->has_sequence_subexpression())) {
3786 const char *const variable_mode
=
3787 (type
->qualifier
.flags
.q
.constant
)
3789 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
3791 /* If ARB_shading_language_420pack is enabled, initializers of
3792 * const-qualified local variables do not have to be constant
3793 * expressions. Const-qualified global variables must still be
3794 * initialized with constant expressions.
3796 if (!state
->has_420pack()
3797 || state
->current_function
== NULL
) {
3798 _mesa_glsl_error(& initializer_loc
, state
,
3799 "initializer of %s variable `%s' must be a "
3800 "constant expression",
3803 if (var
->type
->is_numeric()) {
3804 /* Reduce cascading errors. */
3805 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3806 ? ir_constant::zero(state
, var
->type
) : NULL
;
3810 rhs
= constant_value
;
3811 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3812 ? constant_value
: NULL
;
3815 if (var
->type
->is_numeric()) {
3816 /* Reduce cascading errors. */
3817 var
->constant_value
= type
->qualifier
.flags
.q
.constant
3818 ? ir_constant::zero(state
, var
->type
) : NULL
;
3823 if (rhs
&& !rhs
->type
->is_error()) {
3824 bool temp
= var
->data
.read_only
;
3825 if (type
->qualifier
.flags
.q
.constant
)
3826 var
->data
.read_only
= false;
3828 /* Never emit code to initialize a uniform.
3830 const glsl_type
*initializer_type
;
3831 if (!type
->qualifier
.flags
.q
.uniform
) {
3832 do_assignment(initializer_instructions
, state
,
3837 type
->get_location());
3838 initializer_type
= result
->type
;
3840 initializer_type
= rhs
->type
;
3842 var
->constant_initializer
= rhs
->constant_expression_value();
3843 var
->data
.has_initializer
= true;
3845 /* If the declared variable is an unsized array, it must inherrit
3846 * its full type from the initializer. A declaration such as
3848 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3852 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3854 * The assignment generated in the if-statement (below) will also
3855 * automatically handle this case for non-uniforms.
3857 * If the declared variable is not an array, the types must
3858 * already match exactly. As a result, the type assignment
3859 * here can be done unconditionally. For non-uniforms the call
3860 * to do_assignment can change the type of the initializer (via
3861 * the implicit conversion rules). For uniforms the initializer
3862 * must be a constant expression, and the type of that expression
3863 * was validated above.
3865 var
->type
= initializer_type
;
3867 var
->data
.read_only
= temp
;
3874 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3875 YYLTYPE loc
, ir_variable
*var
,
3876 unsigned num_vertices
,
3878 const char *var_category
)
3880 if (var
->type
->is_unsized_array()) {
3881 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3883 * All geometry shader input unsized array declarations will be
3884 * sized by an earlier input layout qualifier, when present, as per
3885 * the following table.
3887 * Followed by a table mapping each allowed input layout qualifier to
3888 * the corresponding input length.
3890 * Similarly for tessellation control shader outputs.
3892 if (num_vertices
!= 0)
3893 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3896 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3897 * includes the following examples of compile-time errors:
3899 * // code sequence within one shader...
3900 * in vec4 Color1[]; // size unknown
3901 * ...Color1.length()...// illegal, length() unknown
3902 * in vec4 Color2[2]; // size is 2
3903 * ...Color1.length()...// illegal, Color1 still has no size
3904 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3905 * layout(lines) in; // legal, input size is 2, matching
3906 * in vec4 Color4[3]; // illegal, contradicts layout
3909 * To detect the case illustrated by Color3, we verify that the size of
3910 * an explicitly-sized array matches the size of any previously declared
3911 * explicitly-sized array. To detect the case illustrated by Color4, we
3912 * verify that the size of an explicitly-sized array is consistent with
3913 * any previously declared input layout.
3915 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3916 _mesa_glsl_error(&loc
, state
,
3917 "%s size contradicts previously declared layout "
3918 "(size is %u, but layout requires a size of %u)",
3919 var_category
, var
->type
->length
, num_vertices
);
3920 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3921 _mesa_glsl_error(&loc
, state
,
3922 "%s sizes are inconsistent (size is %u, but a "
3923 "previous declaration has size %u)",
3924 var_category
, var
->type
->length
, *size
);
3926 *size
= var
->type
->length
;
3932 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3933 YYLTYPE loc
, ir_variable
*var
)
3935 unsigned num_vertices
= 0;
3937 if (state
->tcs_output_vertices_specified
) {
3938 if (!state
->out_qualifier
->vertices
->
3939 process_qualifier_constant(state
, "vertices",
3940 &num_vertices
, false)) {
3944 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
3945 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
3946 "GL_MAX_PATCH_VERTICES", num_vertices
);
3951 if (!var
->type
->is_array() && !var
->data
.patch
) {
3952 _mesa_glsl_error(&loc
, state
,
3953 "tessellation control shader outputs must be arrays");
3955 /* To avoid cascading failures, short circuit the checks below. */
3959 if (var
->data
.patch
)
3962 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3963 &state
->tcs_output_size
,
3964 "tessellation control shader output");
3968 * Do additional processing necessary for tessellation control/evaluation shader
3969 * input declarations. This covers both interface block arrays and bare input
3973 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3974 YYLTYPE loc
, ir_variable
*var
)
3976 if (!var
->type
->is_array() && !var
->data
.patch
) {
3977 _mesa_glsl_error(&loc
, state
,
3978 "per-vertex tessellation shader inputs must be arrays");
3979 /* Avoid cascading failures. */
3983 if (var
->data
.patch
)
3986 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
3987 if (var
->type
->is_unsized_array()) {
3988 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3989 state
->Const
.MaxPatchVertices
);
3995 * Do additional processing necessary for geometry shader input declarations
3996 * (this covers both interface blocks arrays and bare input variables).
3999 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4000 YYLTYPE loc
, ir_variable
*var
)
4002 unsigned num_vertices
= 0;
4004 if (state
->gs_input_prim_type_specified
) {
4005 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4008 /* Geometry shader input variables must be arrays. Caller should have
4009 * reported an error for this.
4011 if (!var
->type
->is_array()) {
4012 assert(state
->error
);
4014 /* To avoid cascading failures, short circuit the checks below. */
4018 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4019 &state
->gs_input_size
,
4020 "geometry shader input");
4024 validate_identifier(const char *identifier
, YYLTYPE loc
,
4025 struct _mesa_glsl_parse_state
*state
)
4027 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4029 * "Identifiers starting with "gl_" are reserved for use by
4030 * OpenGL, and may not be declared in a shader as either a
4031 * variable or a function."
4033 if (is_gl_identifier(identifier
)) {
4034 _mesa_glsl_error(&loc
, state
,
4035 "identifier `%s' uses reserved `gl_' prefix",
4037 } else if (strstr(identifier
, "__")) {
4038 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4041 * "In addition, all identifiers containing two
4042 * consecutive underscores (__) are reserved as
4043 * possible future keywords."
4045 * The intention is that names containing __ are reserved for internal
4046 * use by the implementation, and names prefixed with GL_ are reserved
4047 * for use by Khronos. Names simply containing __ are dangerous to use,
4048 * but should be allowed.
4050 * A future version of the GLSL specification will clarify this.
4052 _mesa_glsl_warning(&loc
, state
,
4053 "identifier `%s' uses reserved `__' string",
4059 ast_declarator_list::hir(exec_list
*instructions
,
4060 struct _mesa_glsl_parse_state
*state
)
4063 const struct glsl_type
*decl_type
;
4064 const char *type_name
= NULL
;
4065 ir_rvalue
*result
= NULL
;
4066 YYLTYPE loc
= this->get_location();
4068 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4070 * "To ensure that a particular output variable is invariant, it is
4071 * necessary to use the invariant qualifier. It can either be used to
4072 * qualify a previously declared variable as being invariant
4074 * invariant gl_Position; // make existing gl_Position be invariant"
4076 * In these cases the parser will set the 'invariant' flag in the declarator
4077 * list, and the type will be NULL.
4079 if (this->invariant
) {
4080 assert(this->type
== NULL
);
4082 if (state
->current_function
!= NULL
) {
4083 _mesa_glsl_error(& loc
, state
,
4084 "all uses of `invariant' keyword must be at global "
4088 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4089 assert(decl
->array_specifier
== NULL
);
4090 assert(decl
->initializer
== NULL
);
4092 ir_variable
*const earlier
=
4093 state
->symbols
->get_variable(decl
->identifier
);
4094 if (earlier
== NULL
) {
4095 _mesa_glsl_error(& loc
, state
,
4096 "undeclared variable `%s' cannot be marked "
4097 "invariant", decl
->identifier
);
4098 } else if (!is_varying_var(earlier
, state
->stage
)) {
4099 _mesa_glsl_error(&loc
, state
,
4100 "`%s' cannot be marked invariant; interfaces between "
4101 "shader stages only.", decl
->identifier
);
4102 } else if (earlier
->data
.used
) {
4103 _mesa_glsl_error(& loc
, state
,
4104 "variable `%s' may not be redeclared "
4105 "`invariant' after being used",
4108 earlier
->data
.invariant
= true;
4112 /* Invariant redeclarations do not have r-values.
4117 if (this->precise
) {
4118 assert(this->type
== NULL
);
4120 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4121 assert(decl
->array_specifier
== NULL
);
4122 assert(decl
->initializer
== NULL
);
4124 ir_variable
*const earlier
=
4125 state
->symbols
->get_variable(decl
->identifier
);
4126 if (earlier
== NULL
) {
4127 _mesa_glsl_error(& loc
, state
,
4128 "undeclared variable `%s' cannot be marked "
4129 "precise", decl
->identifier
);
4130 } else if (state
->current_function
!= NULL
&&
4131 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4132 /* Note: we have to check if we're in a function, since
4133 * builtins are treated as having come from another scope.
4135 _mesa_glsl_error(& loc
, state
,
4136 "variable `%s' from an outer scope may not be "
4137 "redeclared `precise' in this scope",
4139 } else if (earlier
->data
.used
) {
4140 _mesa_glsl_error(& loc
, state
,
4141 "variable `%s' may not be redeclared "
4142 "`precise' after being used",
4145 earlier
->data
.precise
= true;
4149 /* Precise redeclarations do not have r-values either. */
4153 assert(this->type
!= NULL
);
4154 assert(!this->invariant
);
4155 assert(!this->precise
);
4157 /* The type specifier may contain a structure definition. Process that
4158 * before any of the variable declarations.
4160 (void) this->type
->specifier
->hir(instructions
, state
);
4162 decl_type
= this->type
->glsl_type(& type_name
, state
);
4164 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4165 * "Buffer variables may only be declared inside interface blocks
4166 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4167 * shader storage blocks. It is a compile-time error to declare buffer
4168 * variables at global scope (outside a block)."
4170 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4171 _mesa_glsl_error(&loc
, state
,
4172 "buffer variables cannot be declared outside "
4173 "interface blocks");
4176 /* An offset-qualified atomic counter declaration sets the default
4177 * offset for the next declaration within the same atomic counter
4180 if (decl_type
&& decl_type
->contains_atomic()) {
4181 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4182 type
->qualifier
.flags
.q
.explicit_offset
) {
4183 unsigned qual_binding
;
4184 unsigned qual_offset
;
4185 if (process_qualifier_constant(state
, &loc
, "binding",
4186 type
->qualifier
.binding
,
4188 && process_qualifier_constant(state
, &loc
, "offset",
4189 type
->qualifier
.offset
,
4191 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4196 if (this->declarations
.is_empty()) {
4197 /* If there is no structure involved in the program text, there are two
4198 * possible scenarios:
4200 * - The program text contained something like 'vec4;'. This is an
4201 * empty declaration. It is valid but weird. Emit a warning.
4203 * - The program text contained something like 'S;' and 'S' is not the
4204 * name of a known structure type. This is both invalid and weird.
4207 * - The program text contained something like 'mediump float;'
4208 * when the programmer probably meant 'precision mediump
4209 * float;' Emit a warning with a description of what they
4210 * probably meant to do.
4212 * Note that if decl_type is NULL and there is a structure involved,
4213 * there must have been some sort of error with the structure. In this
4214 * case we assume that an error was already generated on this line of
4215 * code for the structure. There is no need to generate an additional,
4218 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4221 if (decl_type
== NULL
) {
4222 _mesa_glsl_error(&loc
, state
,
4223 "invalid type `%s' in empty declaration",
4226 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4227 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4229 * "The combinations of types and qualifiers that cause
4230 * compile-time or link-time errors are the same whether or not
4231 * the declaration is empty."
4233 validate_array_dimensions(decl_type
, state
, &loc
);
4236 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4237 /* Empty atomic counter declarations are allowed and useful
4238 * to set the default offset qualifier.
4241 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4242 if (this->type
->specifier
->structure
!= NULL
) {
4243 _mesa_glsl_error(&loc
, state
,
4244 "precision qualifiers can't be applied "
4247 static const char *const precision_names
[] = {
4254 _mesa_glsl_warning(&loc
, state
,
4255 "empty declaration with precision "
4256 "qualifier, to set the default precision, "
4257 "use `precision %s %s;'",
4258 precision_names
[this->type
->
4259 qualifier
.precision
],
4262 } else if (this->type
->specifier
->structure
== NULL
) {
4263 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4268 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4269 const struct glsl_type
*var_type
;
4271 const char *identifier
= decl
->identifier
;
4272 /* FINISHME: Emit a warning if a variable declaration shadows a
4273 * FINISHME: declaration at a higher scope.
4276 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4277 if (type_name
!= NULL
) {
4278 _mesa_glsl_error(& loc
, state
,
4279 "invalid type `%s' in declaration of `%s'",
4280 type_name
, decl
->identifier
);
4282 _mesa_glsl_error(& loc
, state
,
4283 "invalid type in declaration of `%s'",
4289 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4293 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4295 _mesa_glsl_error(& loc
, state
,
4296 "invalid type in declaration of `%s'",
4298 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4303 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4306 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4308 /* The 'varying in' and 'varying out' qualifiers can only be used with
4309 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4312 if (this->type
->qualifier
.flags
.q
.varying
) {
4313 if (this->type
->qualifier
.flags
.q
.in
) {
4314 _mesa_glsl_error(& loc
, state
,
4315 "`varying in' qualifier in declaration of "
4316 "`%s' only valid for geometry shaders using "
4317 "ARB_geometry_shader4 or EXT_geometry_shader4",
4319 } else if (this->type
->qualifier
.flags
.q
.out
) {
4320 _mesa_glsl_error(& loc
, state
,
4321 "`varying out' qualifier in declaration of "
4322 "`%s' only valid for geometry shaders using "
4323 "ARB_geometry_shader4 or EXT_geometry_shader4",
4328 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4330 * "Global variables can only use the qualifiers const,
4331 * attribute, uniform, or varying. Only one may be
4334 * Local variables can only use the qualifier const."
4336 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4337 * any extension that adds the 'layout' keyword.
4339 if (!state
->is_version(130, 300)
4340 && !state
->has_explicit_attrib_location()
4341 && !state
->has_separate_shader_objects()
4342 && !state
->ARB_fragment_coord_conventions_enable
) {
4343 if (this->type
->qualifier
.flags
.q
.out
) {
4344 _mesa_glsl_error(& loc
, state
,
4345 "`out' qualifier in declaration of `%s' "
4346 "only valid for function parameters in %s",
4347 decl
->identifier
, state
->get_version_string());
4349 if (this->type
->qualifier
.flags
.q
.in
) {
4350 _mesa_glsl_error(& loc
, state
,
4351 "`in' qualifier in declaration of `%s' "
4352 "only valid for function parameters in %s",
4353 decl
->identifier
, state
->get_version_string());
4355 /* FINISHME: Test for other invalid qualifiers. */
4358 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4360 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4363 if (this->type
->qualifier
.flags
.q
.invariant
) {
4364 if (!is_varying_var(var
, state
->stage
)) {
4365 _mesa_glsl_error(&loc
, state
,
4366 "`%s' cannot be marked invariant; interfaces between "
4367 "shader stages only", var
->name
);
4371 if (state
->current_function
!= NULL
) {
4372 const char *mode
= NULL
;
4373 const char *extra
= "";
4375 /* There is no need to check for 'inout' here because the parser will
4376 * only allow that in function parameter lists.
4378 if (this->type
->qualifier
.flags
.q
.attribute
) {
4380 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4381 mode
= "subroutine uniform";
4382 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4384 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4386 } else if (this->type
->qualifier
.flags
.q
.in
) {
4388 extra
= " or in function parameter list";
4389 } else if (this->type
->qualifier
.flags
.q
.out
) {
4391 extra
= " or in function parameter list";
4395 _mesa_glsl_error(& loc
, state
,
4396 "%s variable `%s' must be declared at "
4398 mode
, var
->name
, extra
);
4400 } else if (var
->data
.mode
== ir_var_shader_in
) {
4401 var
->data
.read_only
= true;
4403 if (state
->stage
== MESA_SHADER_VERTEX
) {
4404 bool error_emitted
= false;
4406 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4408 * "Vertex shader inputs can only be float, floating-point
4409 * vectors, matrices, signed and unsigned integers and integer
4410 * vectors. Vertex shader inputs can also form arrays of these
4411 * types, but not structures."
4413 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4415 * "Vertex shader inputs can only be float, floating-point
4416 * vectors, matrices, signed and unsigned integers and integer
4417 * vectors. They cannot be arrays or structures."
4419 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4421 * "The attribute qualifier can be used only with float,
4422 * floating-point vectors, and matrices. Attribute variables
4423 * cannot be declared as arrays or structures."
4425 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4427 * "Vertex shader inputs can only be float, floating-point
4428 * vectors, matrices, signed and unsigned integers and integer
4429 * vectors. Vertex shader inputs cannot be arrays or
4432 const glsl_type
*check_type
= var
->type
->without_array();
4434 switch (check_type
->base_type
) {
4435 case GLSL_TYPE_FLOAT
:
4437 case GLSL_TYPE_UINT
:
4439 if (state
->is_version(120, 300))
4441 case GLSL_TYPE_DOUBLE
:
4442 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4446 _mesa_glsl_error(& loc
, state
,
4447 "vertex shader input / attribute cannot have "
4449 var
->type
->is_array() ? "array of " : "",
4451 error_emitted
= true;
4454 if (!error_emitted
&& var
->type
->is_array() &&
4455 !state
->check_version(150, 0, &loc
,
4456 "vertex shader input / attribute "
4457 "cannot have array type")) {
4458 error_emitted
= true;
4460 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4461 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4463 * Geometry shader input variables get the per-vertex values
4464 * written out by vertex shader output variables of the same
4465 * names. Since a geometry shader operates on a set of
4466 * vertices, each input varying variable (or input block, see
4467 * interface blocks below) needs to be declared as an array.
4469 if (!var
->type
->is_array()) {
4470 _mesa_glsl_error(&loc
, state
,
4471 "geometry shader inputs must be arrays");
4474 handle_geometry_shader_input_decl(state
, loc
, var
);
4475 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4476 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4478 * It is a compile-time error to declare a fragment shader
4479 * input with, or that contains, any of the following types:
4483 * * An array of arrays
4484 * * An array of structures
4485 * * A structure containing an array
4486 * * A structure containing a structure
4488 if (state
->es_shader
) {
4489 const glsl_type
*check_type
= var
->type
->without_array();
4490 if (check_type
->is_boolean() ||
4491 check_type
->contains_opaque()) {
4492 _mesa_glsl_error(&loc
, state
,
4493 "fragment shader input cannot have type %s",
4496 if (var
->type
->is_array() &&
4497 var
->type
->fields
.array
->is_array()) {
4498 _mesa_glsl_error(&loc
, state
,
4500 "cannot have an array of arrays",
4501 _mesa_shader_stage_to_string(state
->stage
));
4503 if (var
->type
->is_array() &&
4504 var
->type
->fields
.array
->is_record()) {
4505 _mesa_glsl_error(&loc
, state
,
4506 "fragment shader input "
4507 "cannot have an array of structs");
4509 if (var
->type
->is_record()) {
4510 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4511 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4512 var
->type
->fields
.structure
[i
].type
->is_record())
4513 _mesa_glsl_error(&loc
, state
,
4514 "fragement shader input cannot have "
4515 "a struct that contains an "
4520 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
4521 state
->stage
== MESA_SHADER_TESS_EVAL
) {
4522 handle_tess_shader_input_decl(state
, loc
, var
);
4524 } else if (var
->data
.mode
== ir_var_shader_out
) {
4525 const glsl_type
*check_type
= var
->type
->without_array();
4527 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4529 * It is a compile-time error to declare a vertex, tessellation
4530 * evaluation, tessellation control, or geometry shader output
4531 * that contains any of the following:
4533 * * A Boolean type (bool, bvec2 ...)
4536 if (check_type
->is_boolean() || check_type
->contains_opaque())
4537 _mesa_glsl_error(&loc
, state
,
4538 "%s shader output cannot have type %s",
4539 _mesa_shader_stage_to_string(state
->stage
),
4542 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
4544 * It is a compile-time error to declare a fragment shader output
4545 * that contains any of the following:
4547 * * A Boolean type (bool, bvec2 ...)
4548 * * A double-precision scalar or vector (double, dvec2 ...)
4553 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4554 if (check_type
->is_record() || check_type
->is_matrix())
4555 _mesa_glsl_error(&loc
, state
,
4556 "fragment shader output "
4557 "cannot have struct or matrix type");
4558 switch (check_type
->base_type
) {
4559 case GLSL_TYPE_UINT
:
4561 case GLSL_TYPE_FLOAT
:
4564 _mesa_glsl_error(&loc
, state
,
4565 "fragment shader output cannot have "
4566 "type %s", check_type
->name
);
4570 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
4572 * It is a compile-time error to declare a vertex shader output
4573 * with, or that contains, any of the following types:
4577 * * An array of arrays
4578 * * An array of structures
4579 * * A structure containing an array
4580 * * A structure containing a structure
4582 * It is a compile-time error to declare a fragment shader output
4583 * with, or that contains, any of the following types:
4589 * * An array of array
4591 if (state
->es_shader
) {
4592 if (var
->type
->is_array() &&
4593 var
->type
->fields
.array
->is_array()) {
4594 _mesa_glsl_error(&loc
, state
,
4596 "cannot have an array of arrays",
4597 _mesa_shader_stage_to_string(state
->stage
));
4599 if (state
->stage
== MESA_SHADER_VERTEX
) {
4600 if (var
->type
->is_array() &&
4601 var
->type
->fields
.array
->is_record()) {
4602 _mesa_glsl_error(&loc
, state
,
4603 "vertex shader output "
4604 "cannot have an array of structs");
4606 if (var
->type
->is_record()) {
4607 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
4608 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
4609 var
->type
->fields
.structure
[i
].type
->is_record())
4610 _mesa_glsl_error(&loc
, state
,
4611 "vertex shader output cannot have a "
4612 "struct that contains an "
4619 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
4620 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4622 } else if (var
->type
->contains_subroutine()) {
4623 /* declare subroutine uniforms as hidden */
4624 var
->data
.how_declared
= ir_var_hidden
;
4627 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4628 * so must integer vertex outputs.
4630 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4631 * "Fragment shader inputs that are signed or unsigned integers or
4632 * integer vectors must be qualified with the interpolation qualifier
4635 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4636 * "Fragment shader inputs that are, or contain, signed or unsigned
4637 * integers or integer vectors must be qualified with the
4638 * interpolation qualifier flat."
4640 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4641 * "Vertex shader outputs that are, or contain, signed or unsigned
4642 * integers or integer vectors must be qualified with the
4643 * interpolation qualifier flat."
4645 * Note that prior to GLSL 1.50, this requirement applied to vertex
4646 * outputs rather than fragment inputs. That creates problems in the
4647 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4648 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4649 * apply the restriction to both vertex outputs and fragment inputs.
4651 * Note also that the desktop GLSL specs are missing the text "or
4652 * contain"; this is presumably an oversight, since there is no
4653 * reasonable way to interpolate a fragment shader input that contains
4656 if (state
->is_version(130, 300) &&
4657 var
->type
->contains_integer() &&
4658 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4659 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4660 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4661 && state
->es_shader
))) {
4662 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4663 "vertex output" : "fragment input";
4664 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4665 "an integer, then it must be qualified with 'flat'",
4669 /* Double fragment inputs must be qualified with 'flat'. */
4670 if (var
->type
->contains_double() &&
4671 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4672 state
->stage
== MESA_SHADER_FRAGMENT
&&
4673 var
->data
.mode
== ir_var_shader_in
) {
4674 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4675 "a double, then it must be qualified with 'flat'",
4679 /* Interpolation qualifiers cannot be applied to 'centroid' and
4680 * 'centroid varying'.
4682 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4683 * "interpolation qualifiers may only precede the qualifiers in,
4684 * centroid in, out, or centroid out in a declaration. They do not apply
4685 * to the deprecated storage qualifiers varying or centroid varying."
4687 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4689 if (state
->is_version(130, 0)
4690 && this->type
->qualifier
.has_interpolation()
4691 && this->type
->qualifier
.flags
.q
.varying
) {
4693 const char *i
= this->type
->qualifier
.interpolation_string();
4696 if (this->type
->qualifier
.flags
.q
.centroid
)
4697 s
= "centroid varying";
4701 _mesa_glsl_error(&loc
, state
,
4702 "qualifier '%s' cannot be applied to the "
4703 "deprecated storage qualifier '%s'", i
, s
);
4707 /* Interpolation qualifiers can only apply to vertex shader outputs and
4708 * fragment shader inputs.
4710 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4711 * "Outputs from a vertex shader (out) and inputs to a fragment
4712 * shader (in) can be further qualified with one or more of these
4713 * interpolation qualifiers"
4715 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4716 * "These interpolation qualifiers may only precede the qualifiers
4717 * in, centroid in, out, or centroid out in a declaration. They do
4718 * not apply to inputs into a vertex shader or outputs from a
4721 if (state
->is_version(130, 300)
4722 && this->type
->qualifier
.has_interpolation()) {
4724 const char *i
= this->type
->qualifier
.interpolation_string();
4727 switch (state
->stage
) {
4728 case MESA_SHADER_VERTEX
:
4729 if (this->type
->qualifier
.flags
.q
.in
) {
4730 _mesa_glsl_error(&loc
, state
,
4731 "qualifier '%s' cannot be applied to vertex "
4732 "shader inputs", i
);
4735 case MESA_SHADER_FRAGMENT
:
4736 if (this->type
->qualifier
.flags
.q
.out
) {
4737 _mesa_glsl_error(&loc
, state
,
4738 "qualifier '%s' cannot be applied to fragment "
4739 "shader outputs", i
);
4748 /* From section 4.3.4 of the GLSL 4.00 spec:
4749 * "Input variables may not be declared using the patch in qualifier
4750 * in tessellation control or geometry shaders."
4752 * From section 4.3.6 of the GLSL 4.00 spec:
4753 * "It is an error to use patch out in a vertex, tessellation
4754 * evaluation, or geometry shader."
4756 * This doesn't explicitly forbid using them in a fragment shader, but
4757 * that's probably just an oversight.
4759 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4760 && this->type
->qualifier
.flags
.q
.patch
4761 && this->type
->qualifier
.flags
.q
.in
) {
4763 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4764 "tessellation evaluation shader");
4767 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4768 && this->type
->qualifier
.flags
.q
.patch
4769 && this->type
->qualifier
.flags
.q
.out
) {
4771 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4772 "tessellation control shader");
4775 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4777 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4778 state
->check_precision_qualifiers_allowed(&loc
);
4782 /* If a precision qualifier is allowed on a type, it is allowed on
4783 * an array of that type.
4785 if (!(this->type
->qualifier
.precision
== ast_precision_none
4786 || precision_qualifier_allowed(var
->type
->without_array()))) {
4788 _mesa_glsl_error(&loc
, state
,
4789 "precision qualifiers apply only to floating point"
4790 ", integer and opaque types");
4793 /* From section 4.1.7 of the GLSL 4.40 spec:
4795 * "[Opaque types] can only be declared as function
4796 * parameters or uniform-qualified variables."
4798 if (var_type
->contains_opaque() &&
4799 !this->type
->qualifier
.flags
.q
.uniform
) {
4800 _mesa_glsl_error(&loc
, state
,
4801 "opaque variables must be declared uniform");
4804 /* Process the initializer and add its instructions to a temporary
4805 * list. This list will be added to the instruction stream (below) after
4806 * the declaration is added. This is done because in some cases (such as
4807 * redeclarations) the declaration may not actually be added to the
4808 * instruction stream.
4810 exec_list initializer_instructions
;
4812 /* Examine var name here since var may get deleted in the next call */
4813 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4815 ir_variable
*earlier
=
4816 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4817 false /* allow_all_redeclarations */);
4818 if (earlier
!= NULL
) {
4820 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4821 _mesa_glsl_error(&loc
, state
,
4822 "`%s' has already been redeclared using "
4823 "gl_PerVertex", earlier
->name
);
4825 earlier
->data
.how_declared
= ir_var_declared_normally
;
4828 if (decl
->initializer
!= NULL
) {
4829 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4831 &initializer_instructions
, state
);
4833 validate_array_dimensions(var_type
, state
, &loc
);
4836 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4838 * "It is an error to write to a const variable outside of
4839 * its declaration, so they must be initialized when
4842 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4843 _mesa_glsl_error(& loc
, state
,
4844 "const declaration of `%s' must be initialized",
4848 if (state
->es_shader
) {
4849 const glsl_type
*const t
= (earlier
== NULL
)
4850 ? var
->type
: earlier
->type
;
4852 if (t
->is_unsized_array())
4853 /* Section 10.17 of the GLSL ES 1.00 specification states that
4854 * unsized array declarations have been removed from the language.
4855 * Arrays that are sized using an initializer are still explicitly
4856 * sized. However, GLSL ES 1.00 does not allow array
4857 * initializers. That is only allowed in GLSL ES 3.00.
4859 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4861 * "An array type can also be formed without specifying a size
4862 * if the definition includes an initializer:
4864 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4865 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4870 _mesa_glsl_error(& loc
, state
,
4871 "unsized array declarations are not allowed in "
4875 /* If the declaration is not a redeclaration, there are a few additional
4876 * semantic checks that must be applied. In addition, variable that was
4877 * created for the declaration should be added to the IR stream.
4879 if (earlier
== NULL
) {
4880 validate_identifier(decl
->identifier
, loc
, state
);
4882 /* Add the variable to the symbol table. Note that the initializer's
4883 * IR was already processed earlier (though it hasn't been emitted
4884 * yet), without the variable in scope.
4886 * This differs from most C-like languages, but it follows the GLSL
4887 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4890 * "Within a declaration, the scope of a name starts immediately
4891 * after the initializer if present or immediately after the name
4892 * being declared if not."
4894 if (!state
->symbols
->add_variable(var
)) {
4895 YYLTYPE loc
= this->get_location();
4896 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4897 "current scope", decl
->identifier
);
4901 /* Push the variable declaration to the top. It means that all the
4902 * variable declarations will appear in a funny last-to-first order,
4903 * but otherwise we run into trouble if a function is prototyped, a
4904 * global var is decled, then the function is defined with usage of
4905 * the global var. See glslparsertest's CorrectModule.frag.
4907 instructions
->push_head(var
);
4910 instructions
->append_list(&initializer_instructions
);
4914 /* Generally, variable declarations do not have r-values. However,
4915 * one is used for the declaration in
4917 * while (bool b = some_condition()) {
4921 * so we return the rvalue from the last seen declaration here.
4928 ast_parameter_declarator::hir(exec_list
*instructions
,
4929 struct _mesa_glsl_parse_state
*state
)
4932 const struct glsl_type
*type
;
4933 const char *name
= NULL
;
4934 YYLTYPE loc
= this->get_location();
4936 type
= this->type
->glsl_type(& name
, state
);
4940 _mesa_glsl_error(& loc
, state
,
4941 "invalid type `%s' in declaration of `%s'",
4942 name
, this->identifier
);
4944 _mesa_glsl_error(& loc
, state
,
4945 "invalid type in declaration of `%s'",
4949 type
= glsl_type::error_type
;
4952 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4954 * "Functions that accept no input arguments need not use void in the
4955 * argument list because prototypes (or definitions) are required and
4956 * therefore there is no ambiguity when an empty argument list "( )" is
4957 * declared. The idiom "(void)" as a parameter list is provided for
4960 * Placing this check here prevents a void parameter being set up
4961 * for a function, which avoids tripping up checks for main taking
4962 * parameters and lookups of an unnamed symbol.
4964 if (type
->is_void()) {
4965 if (this->identifier
!= NULL
)
4966 _mesa_glsl_error(& loc
, state
,
4967 "named parameter cannot have type `void'");
4973 if (formal_parameter
&& (this->identifier
== NULL
)) {
4974 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4978 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4979 * call already handled the "vec4[..] foo" case.
4981 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4983 if (!type
->is_error() && type
->is_unsized_array()) {
4984 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4986 type
= glsl_type::error_type
;
4990 ir_variable
*var
= new(ctx
)
4991 ir_variable(type
, this->identifier
, ir_var_function_in
);
4993 /* Apply any specified qualifiers to the parameter declaration. Note that
4994 * for function parameters the default mode is 'in'.
4996 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
4999 /* From section 4.1.7 of the GLSL 4.40 spec:
5001 * "Opaque variables cannot be treated as l-values; hence cannot
5002 * be used as out or inout function parameters, nor can they be
5005 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5006 && type
->contains_opaque()) {
5007 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5008 "contain opaque variables");
5009 type
= glsl_type::error_type
;
5012 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5014 * "When calling a function, expressions that do not evaluate to
5015 * l-values cannot be passed to parameters declared as out or inout."
5017 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5019 * "Other binary or unary expressions, non-dereferenced arrays,
5020 * function names, swizzles with repeated fields, and constants
5021 * cannot be l-values."
5023 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5024 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5026 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5028 && !state
->check_version(120, 100, &loc
,
5029 "arrays cannot be out or inout parameters")) {
5030 type
= glsl_type::error_type
;
5033 instructions
->push_tail(var
);
5035 /* Parameter declarations do not have r-values.
5042 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5044 exec_list
*ir_parameters
,
5045 _mesa_glsl_parse_state
*state
)
5047 ast_parameter_declarator
*void_param
= NULL
;
5050 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5051 param
->formal_parameter
= formal
;
5052 param
->hir(ir_parameters
, state
);
5060 if ((void_param
!= NULL
) && (count
> 1)) {
5061 YYLTYPE loc
= void_param
->get_location();
5063 _mesa_glsl_error(& loc
, state
,
5064 "`void' parameter must be only parameter");
5070 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5072 /* IR invariants disallow function declarations or definitions
5073 * nested within other function definitions. But there is no
5074 * requirement about the relative order of function declarations
5075 * and definitions with respect to one another. So simply insert
5076 * the new ir_function block at the end of the toplevel instruction
5079 state
->toplevel_ir
->push_tail(f
);
5084 ast_function::hir(exec_list
*instructions
,
5085 struct _mesa_glsl_parse_state
*state
)
5088 ir_function
*f
= NULL
;
5089 ir_function_signature
*sig
= NULL
;
5090 exec_list hir_parameters
;
5091 YYLTYPE loc
= this->get_location();
5093 const char *const name
= identifier
;
5095 /* New functions are always added to the top-level IR instruction stream,
5096 * so this instruction list pointer is ignored. See also emit_function
5099 (void) instructions
;
5101 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5103 * "Function declarations (prototypes) cannot occur inside of functions;
5104 * they must be at global scope, or for the built-in functions, outside
5105 * the global scope."
5107 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5109 * "User defined functions may only be defined within the global scope."
5111 * Note that this language does not appear in GLSL 1.10.
5113 if ((state
->current_function
!= NULL
) &&
5114 state
->is_version(120, 100)) {
5115 YYLTYPE loc
= this->get_location();
5116 _mesa_glsl_error(&loc
, state
,
5117 "declaration of function `%s' not allowed within "
5118 "function body", name
);
5121 validate_identifier(name
, this->get_location(), state
);
5123 /* Convert the list of function parameters to HIR now so that they can be
5124 * used below to compare this function's signature with previously seen
5125 * signatures for functions with the same name.
5127 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5129 & hir_parameters
, state
);
5131 const char *return_type_name
;
5132 const glsl_type
*return_type
=
5133 this->return_type
->glsl_type(& return_type_name
, state
);
5136 YYLTYPE loc
= this->get_location();
5137 _mesa_glsl_error(&loc
, state
,
5138 "function `%s' has undeclared return type `%s'",
5139 name
, return_type_name
);
5140 return_type
= glsl_type::error_type
;
5143 /* ARB_shader_subroutine states:
5144 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5145 * subroutine(...) to a function declaration."
5147 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5148 YYLTYPE loc
= this->get_location();
5149 _mesa_glsl_error(&loc
, state
,
5150 "function declaration `%s' cannot have subroutine prepended",
5154 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5155 * "No qualifier is allowed on the return type of a function."
5157 if (this->return_type
->has_qualifiers(state
)) {
5158 YYLTYPE loc
= this->get_location();
5159 _mesa_glsl_error(& loc
, state
,
5160 "function `%s' return type has qualifiers", name
);
5163 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5165 * "Arrays are allowed as arguments and as the return type. In both
5166 * cases, the array must be explicitly sized."
5168 if (return_type
->is_unsized_array()) {
5169 YYLTYPE loc
= this->get_location();
5170 _mesa_glsl_error(& loc
, state
,
5171 "function `%s' return type array must be explicitly "
5175 /* From section 4.1.7 of the GLSL 4.40 spec:
5177 * "[Opaque types] can only be declared as function parameters
5178 * or uniform-qualified variables."
5180 if (return_type
->contains_opaque()) {
5181 YYLTYPE loc
= this->get_location();
5182 _mesa_glsl_error(&loc
, state
,
5183 "function `%s' return type can't contain an opaque type",
5187 /* Create an ir_function if one doesn't already exist. */
5188 f
= state
->symbols
->get_function(name
);
5190 f
= new(ctx
) ir_function(name
);
5191 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5192 if (!state
->symbols
->add_function(f
)) {
5193 /* This function name shadows a non-function use of the same name. */
5194 YYLTYPE loc
= this->get_location();
5195 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5196 "non-function", name
);
5200 emit_function(state
, f
);
5203 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5205 * "A shader cannot redefine or overload built-in functions."
5207 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5209 * "User code can overload the built-in functions but cannot redefine
5212 if (state
->es_shader
&& state
->language_version
>= 300) {
5213 /* Local shader has no exact candidates; check the built-ins. */
5214 _mesa_glsl_initialize_builtin_functions();
5215 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5216 YYLTYPE loc
= this->get_location();
5217 _mesa_glsl_error(& loc
, state
,
5218 "A shader cannot redefine or overload built-in "
5219 "function `%s' in GLSL ES 3.00", name
);
5224 /* Verify that this function's signature either doesn't match a previously
5225 * seen signature for a function with the same name, or, if a match is found,
5226 * that the previously seen signature does not have an associated definition.
5228 if (state
->es_shader
|| f
->has_user_signature()) {
5229 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5231 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5232 if (badvar
!= NULL
) {
5233 YYLTYPE loc
= this->get_location();
5235 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5236 "qualifiers don't match prototype", name
, badvar
);
5239 if (sig
->return_type
!= return_type
) {
5240 YYLTYPE loc
= this->get_location();
5242 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5243 "match prototype", name
);
5246 if (sig
->is_defined
) {
5247 if (is_definition
) {
5248 YYLTYPE loc
= this->get_location();
5249 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5251 /* We just encountered a prototype that exactly matches a
5252 * function that's already been defined. This is redundant,
5253 * and we should ignore it.
5261 /* Verify the return type of main() */
5262 if (strcmp(name
, "main") == 0) {
5263 if (! return_type
->is_void()) {
5264 YYLTYPE loc
= this->get_location();
5266 _mesa_glsl_error(& loc
, state
, "main() must return void");
5269 if (!hir_parameters
.is_empty()) {
5270 YYLTYPE loc
= this->get_location();
5272 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5276 /* Finish storing the information about this new function in its signature.
5279 sig
= new(ctx
) ir_function_signature(return_type
);
5280 f
->add_signature(sig
);
5283 sig
->replace_parameters(&hir_parameters
);
5286 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5289 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5290 unsigned qual_index
;
5291 if (process_qualifier_constant(state
, &loc
, "index",
5292 this->return_type
->qualifier
.index
,
5294 if (!state
->has_explicit_uniform_location()) {
5295 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5296 "GL_ARB_explicit_uniform_location or "
5298 } else if (qual_index
>= MAX_SUBROUTINES
) {
5299 _mesa_glsl_error(&loc
, state
,
5300 "invalid subroutine index (%d) index must "
5301 "be a number between 0 and "
5302 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5303 MAX_SUBROUTINES
- 1);
5305 f
->subroutine_index
= qual_index
;
5310 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5311 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5312 f
->num_subroutine_types
);
5314 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5315 const struct glsl_type
*type
;
5316 /* the subroutine type must be already declared */
5317 type
= state
->symbols
->get_type(decl
->identifier
);
5319 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5321 f
->subroutine_types
[idx
++] = type
;
5323 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5325 state
->num_subroutines
+ 1);
5326 state
->subroutines
[state
->num_subroutines
] = f
;
5327 state
->num_subroutines
++;
5331 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5332 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5333 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5336 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5338 state
->num_subroutine_types
+ 1);
5339 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5340 state
->num_subroutine_types
++;
5342 f
->is_subroutine
= true;
5345 /* Function declarations (prototypes) do not have r-values.
5352 ast_function_definition::hir(exec_list
*instructions
,
5353 struct _mesa_glsl_parse_state
*state
)
5355 prototype
->is_definition
= true;
5356 prototype
->hir(instructions
, state
);
5358 ir_function_signature
*signature
= prototype
->signature
;
5359 if (signature
== NULL
)
5362 assert(state
->current_function
== NULL
);
5363 state
->current_function
= signature
;
5364 state
->found_return
= false;
5366 /* Duplicate parameters declared in the prototype as concrete variables.
5367 * Add these to the symbol table.
5369 state
->symbols
->push_scope();
5370 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5371 assert(var
->as_variable() != NULL
);
5373 /* The only way a parameter would "exist" is if two parameters have
5376 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5377 YYLTYPE loc
= this->get_location();
5379 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5381 state
->symbols
->add_variable(var
);
5385 /* Convert the body of the function to HIR. */
5386 this->body
->hir(&signature
->body
, state
);
5387 signature
->is_defined
= true;
5389 state
->symbols
->pop_scope();
5391 assert(state
->current_function
== signature
);
5392 state
->current_function
= NULL
;
5394 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5395 YYLTYPE loc
= this->get_location();
5396 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5397 "%s, but no return statement",
5398 signature
->function_name(),
5399 signature
->return_type
->name
);
5402 /* Function definitions do not have r-values.
5409 ast_jump_statement::hir(exec_list
*instructions
,
5410 struct _mesa_glsl_parse_state
*state
)
5417 assert(state
->current_function
);
5419 if (opt_return_value
) {
5420 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5422 /* The value of the return type can be NULL if the shader says
5423 * 'return foo();' and foo() is a function that returns void.
5425 * NOTE: The GLSL spec doesn't say that this is an error. The type
5426 * of the return value is void. If the return type of the function is
5427 * also void, then this should compile without error. Seriously.
5429 const glsl_type
*const ret_type
=
5430 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5432 /* Implicit conversions are not allowed for return values prior to
5433 * ARB_shading_language_420pack.
5435 if (state
->current_function
->return_type
!= ret_type
) {
5436 YYLTYPE loc
= this->get_location();
5438 if (state
->has_420pack()) {
5439 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5441 _mesa_glsl_error(& loc
, state
,
5442 "could not implicitly convert return value "
5443 "to %s, in function `%s'",
5444 state
->current_function
->return_type
->name
,
5445 state
->current_function
->function_name());
5448 _mesa_glsl_error(& loc
, state
,
5449 "`return' with wrong type %s, in function `%s' "
5452 state
->current_function
->function_name(),
5453 state
->current_function
->return_type
->name
);
5455 } else if (state
->current_function
->return_type
->base_type
==
5457 YYLTYPE loc
= this->get_location();
5459 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5460 * specs add a clarification:
5462 * "A void function can only use return without a return argument, even if
5463 * the return argument has void type. Return statements only accept values:
5466 * void func2() { return func1(); } // illegal return statement"
5468 _mesa_glsl_error(& loc
, state
,
5469 "void functions can only use `return' without a "
5473 inst
= new(ctx
) ir_return(ret
);
5475 if (state
->current_function
->return_type
->base_type
!=
5477 YYLTYPE loc
= this->get_location();
5479 _mesa_glsl_error(& loc
, state
,
5480 "`return' with no value, in function %s returning "
5482 state
->current_function
->function_name());
5484 inst
= new(ctx
) ir_return
;
5487 state
->found_return
= true;
5488 instructions
->push_tail(inst
);
5493 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5494 YYLTYPE loc
= this->get_location();
5496 _mesa_glsl_error(& loc
, state
,
5497 "`discard' may only appear in a fragment shader");
5499 instructions
->push_tail(new(ctx
) ir_discard
);
5504 if (mode
== ast_continue
&&
5505 state
->loop_nesting_ast
== NULL
) {
5506 YYLTYPE loc
= this->get_location();
5508 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5509 } else if (mode
== ast_break
&&
5510 state
->loop_nesting_ast
== NULL
&&
5511 state
->switch_state
.switch_nesting_ast
== NULL
) {
5512 YYLTYPE loc
= this->get_location();
5514 _mesa_glsl_error(& loc
, state
,
5515 "break may only appear in a loop or a switch");
5517 /* For a loop, inline the for loop expression again, since we don't
5518 * know where near the end of the loop body the normal copy of it is
5519 * going to be placed. Same goes for the condition for a do-while
5522 if (state
->loop_nesting_ast
!= NULL
&&
5523 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5524 if (state
->loop_nesting_ast
->rest_expression
) {
5525 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5528 if (state
->loop_nesting_ast
->mode
==
5529 ast_iteration_statement::ast_do_while
) {
5530 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5534 if (state
->switch_state
.is_switch_innermost
&&
5535 mode
== ast_continue
) {
5536 /* Set 'continue_inside' to true. */
5537 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5538 ir_dereference_variable
*deref_continue_inside_var
=
5539 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5540 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5543 /* Break out from the switch, continue for the loop will
5544 * be called right after switch. */
5545 ir_loop_jump
*const jump
=
5546 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5547 instructions
->push_tail(jump
);
5549 } else if (state
->switch_state
.is_switch_innermost
&&
5550 mode
== ast_break
) {
5551 /* Force break out of switch by inserting a break. */
5552 ir_loop_jump
*const jump
=
5553 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5554 instructions
->push_tail(jump
);
5556 ir_loop_jump
*const jump
=
5557 new(ctx
) ir_loop_jump((mode
== ast_break
)
5558 ? ir_loop_jump::jump_break
5559 : ir_loop_jump::jump_continue
);
5560 instructions
->push_tail(jump
);
5567 /* Jump instructions do not have r-values.
5574 ast_selection_statement::hir(exec_list
*instructions
,
5575 struct _mesa_glsl_parse_state
*state
)
5579 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
5581 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
5583 * "Any expression whose type evaluates to a Boolean can be used as the
5584 * conditional expression bool-expression. Vector types are not accepted
5585 * as the expression to if."
5587 * The checks are separated so that higher quality diagnostics can be
5588 * generated for cases where both rules are violated.
5590 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
5591 YYLTYPE loc
= this->condition
->get_location();
5593 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
5597 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
5599 if (then_statement
!= NULL
) {
5600 state
->symbols
->push_scope();
5601 then_statement
->hir(& stmt
->then_instructions
, state
);
5602 state
->symbols
->pop_scope();
5605 if (else_statement
!= NULL
) {
5606 state
->symbols
->push_scope();
5607 else_statement
->hir(& stmt
->else_instructions
, state
);
5608 state
->symbols
->pop_scope();
5611 instructions
->push_tail(stmt
);
5613 /* if-statements do not have r-values.
5620 ast_switch_statement::hir(exec_list
*instructions
,
5621 struct _mesa_glsl_parse_state
*state
)
5625 ir_rvalue
*const test_expression
=
5626 this->test_expression
->hir(instructions
, state
);
5628 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
5630 * "The type of init-expression in a switch statement must be a
5633 if (!test_expression
->type
->is_scalar() ||
5634 !test_expression
->type
->is_integer()) {
5635 YYLTYPE loc
= this->test_expression
->get_location();
5637 _mesa_glsl_error(& loc
,
5639 "switch-statement expression must be scalar "
5643 /* Track the switch-statement nesting in a stack-like manner.
5645 struct glsl_switch_state saved
= state
->switch_state
;
5647 state
->switch_state
.is_switch_innermost
= true;
5648 state
->switch_state
.switch_nesting_ast
= this;
5649 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5650 hash_table_pointer_compare
);
5651 state
->switch_state
.previous_default
= NULL
;
5653 /* Initalize is_fallthru state to false.
5655 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5656 state
->switch_state
.is_fallthru_var
=
5657 new(ctx
) ir_variable(glsl_type::bool_type
,
5658 "switch_is_fallthru_tmp",
5660 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5662 ir_dereference_variable
*deref_is_fallthru_var
=
5663 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5664 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5667 /* Initialize continue_inside state to false.
5669 state
->switch_state
.continue_inside
=
5670 new(ctx
) ir_variable(glsl_type::bool_type
,
5671 "continue_inside_tmp",
5673 instructions
->push_tail(state
->switch_state
.continue_inside
);
5675 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5676 ir_dereference_variable
*deref_continue_inside_var
=
5677 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5678 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5681 state
->switch_state
.run_default
=
5682 new(ctx
) ir_variable(glsl_type::bool_type
,
5685 instructions
->push_tail(state
->switch_state
.run_default
);
5687 /* Loop around the switch is used for flow control. */
5688 ir_loop
* loop
= new(ctx
) ir_loop();
5689 instructions
->push_tail(loop
);
5691 /* Cache test expression.
5693 test_to_hir(&loop
->body_instructions
, state
);
5695 /* Emit code for body of switch stmt.
5697 body
->hir(&loop
->body_instructions
, state
);
5699 /* Insert a break at the end to exit loop. */
5700 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5701 loop
->body_instructions
.push_tail(jump
);
5703 /* If we are inside loop, check if continue got called inside switch. */
5704 if (state
->loop_nesting_ast
!= NULL
) {
5705 ir_dereference_variable
*deref_continue_inside
=
5706 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5707 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5708 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5710 if (state
->loop_nesting_ast
!= NULL
) {
5711 if (state
->loop_nesting_ast
->rest_expression
) {
5712 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5715 if (state
->loop_nesting_ast
->mode
==
5716 ast_iteration_statement::ast_do_while
) {
5717 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5720 irif
->then_instructions
.push_tail(jump
);
5721 instructions
->push_tail(irif
);
5724 hash_table_dtor(state
->switch_state
.labels_ht
);
5726 state
->switch_state
= saved
;
5728 /* Switch statements do not have r-values. */
5734 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5735 struct _mesa_glsl_parse_state
*state
)
5739 /* Cache value of test expression. */
5740 ir_rvalue
*const test_val
=
5741 test_expression
->hir(instructions
,
5744 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5747 ir_dereference_variable
*deref_test_var
=
5748 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5750 instructions
->push_tail(state
->switch_state
.test_var
);
5751 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5756 ast_switch_body::hir(exec_list
*instructions
,
5757 struct _mesa_glsl_parse_state
*state
)
5760 stmts
->hir(instructions
, state
);
5762 /* Switch bodies do not have r-values. */
5767 ast_case_statement_list::hir(exec_list
*instructions
,
5768 struct _mesa_glsl_parse_state
*state
)
5770 exec_list default_case
, after_default
, tmp
;
5772 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5773 case_stmt
->hir(&tmp
, state
);
5776 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5777 default_case
.append_list(&tmp
);
5781 /* If default case found, append 'after_default' list. */
5782 if (!default_case
.is_empty())
5783 after_default
.append_list(&tmp
);
5785 instructions
->append_list(&tmp
);
5788 /* Handle the default case. This is done here because default might not be
5789 * the last case. We need to add checks against following cases first to see
5790 * if default should be chosen or not.
5792 if (!default_case
.is_empty()) {
5794 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5795 ir_dereference_variable
*deref_run_default_var
=
5796 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5798 /* Choose to run default case initially, following conditional
5799 * assignments might change this.
5801 ir_assignment
*const init_var
=
5802 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5803 instructions
->push_tail(init_var
);
5805 /* Default case was the last one, no checks required. */
5806 if (after_default
.is_empty()) {
5807 instructions
->append_list(&default_case
);
5811 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5812 ir_assignment
*assign
= ir
->as_assignment();
5817 /* Clone the check between case label and init expression. */
5818 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5819 ir_expression
*clone
= exp
->clone(state
, NULL
);
5821 ir_dereference_variable
*deref_var
=
5822 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5823 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5825 ir_assignment
*const set_false
=
5826 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5828 instructions
->push_tail(set_false
);
5831 /* Append default case and all cases after it. */
5832 instructions
->append_list(&default_case
);
5833 instructions
->append_list(&after_default
);
5836 /* Case statements do not have r-values. */
5841 ast_case_statement::hir(exec_list
*instructions
,
5842 struct _mesa_glsl_parse_state
*state
)
5844 labels
->hir(instructions
, state
);
5846 /* Guard case statements depending on fallthru state. */
5847 ir_dereference_variable
*const deref_fallthru_guard
=
5848 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5849 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5851 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5852 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5854 instructions
->push_tail(test_fallthru
);
5856 /* Case statements do not have r-values. */
5862 ast_case_label_list::hir(exec_list
*instructions
,
5863 struct _mesa_glsl_parse_state
*state
)
5865 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5866 label
->hir(instructions
, state
);
5868 /* Case labels do not have r-values. */
5873 ast_case_label::hir(exec_list
*instructions
,
5874 struct _mesa_glsl_parse_state
*state
)
5878 ir_dereference_variable
*deref_fallthru_var
=
5879 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5881 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5883 /* If not default case, ... */
5884 if (this->test_value
!= NULL
) {
5885 /* Conditionally set fallthru state based on
5886 * comparison of cached test expression value to case label.
5888 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5889 ir_constant
*label_const
= label_rval
->constant_expression_value();
5892 YYLTYPE loc
= this->test_value
->get_location();
5894 _mesa_glsl_error(& loc
, state
,
5895 "switch statement case label must be a "
5896 "constant expression");
5898 /* Stuff a dummy value in to allow processing to continue. */
5899 label_const
= new(ctx
) ir_constant(0);
5901 ast_expression
*previous_label
= (ast_expression
*)
5902 hash_table_find(state
->switch_state
.labels_ht
,
5903 (void *)(uintptr_t)label_const
->value
.u
[0]);
5905 if (previous_label
) {
5906 YYLTYPE loc
= this->test_value
->get_location();
5907 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5909 loc
= previous_label
->get_location();
5910 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5912 hash_table_insert(state
->switch_state
.labels_ht
,
5914 (void *)(uintptr_t)label_const
->value
.u
[0]);
5918 ir_dereference_variable
*deref_test_var
=
5919 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5921 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5926 * From GLSL 4.40 specification section 6.2 ("Selection"):
5928 * "The type of the init-expression value in a switch statement must
5929 * be a scalar int or uint. The type of the constant-expression value
5930 * in a case label also must be a scalar int or uint. When any pair
5931 * of these values is tested for "equal value" and the types do not
5932 * match, an implicit conversion will be done to convert the int to a
5933 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5936 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5937 YYLTYPE loc
= this->test_value
->get_location();
5939 const glsl_type
*type_a
= label_const
->type
;
5940 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5942 /* Check if int->uint implicit conversion is supported. */
5943 bool integer_conversion_supported
=
5944 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5947 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5948 !integer_conversion_supported
) {
5949 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
5950 "init-expression and case label (%s != %s)",
5951 type_a
->name
, type_b
->name
);
5953 /* Conversion of the case label. */
5954 if (type_a
->base_type
== GLSL_TYPE_INT
) {
5955 if (!apply_implicit_conversion(glsl_type::uint_type
,
5956 test_cond
->operands
[0], state
))
5957 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5959 /* Conversion of the init-expression value. */
5960 if (!apply_implicit_conversion(glsl_type::uint_type
,
5961 test_cond
->operands
[1], state
))
5962 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5967 ir_assignment
*set_fallthru_on_test
=
5968 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5970 instructions
->push_tail(set_fallthru_on_test
);
5971 } else { /* default case */
5972 if (state
->switch_state
.previous_default
) {
5973 YYLTYPE loc
= this->get_location();
5974 _mesa_glsl_error(& loc
, state
,
5975 "multiple default labels in one switch");
5977 loc
= state
->switch_state
.previous_default
->get_location();
5978 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5980 state
->switch_state
.previous_default
= this;
5982 /* Set fallthru condition on 'run_default' bool. */
5983 ir_dereference_variable
*deref_run_default
=
5984 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5985 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5986 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5990 /* Set falltrhu state. */
5991 ir_assignment
*set_fallthru
=
5992 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5994 instructions
->push_tail(set_fallthru
);
5997 /* Case statements do not have r-values. */
6002 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6003 struct _mesa_glsl_parse_state
*state
)
6007 if (condition
!= NULL
) {
6008 ir_rvalue
*const cond
=
6009 condition
->hir(instructions
, state
);
6012 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6013 YYLTYPE loc
= condition
->get_location();
6015 _mesa_glsl_error(& loc
, state
,
6016 "loop condition must be scalar boolean");
6018 /* As the first code in the loop body, generate a block that looks
6019 * like 'if (!condition) break;' as the loop termination condition.
6021 ir_rvalue
*const not_cond
=
6022 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6024 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6026 ir_jump
*const break_stmt
=
6027 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6029 if_stmt
->then_instructions
.push_tail(break_stmt
);
6030 instructions
->push_tail(if_stmt
);
6037 ast_iteration_statement::hir(exec_list
*instructions
,
6038 struct _mesa_glsl_parse_state
*state
)
6042 /* For-loops and while-loops start a new scope, but do-while loops do not.
6044 if (mode
!= ast_do_while
)
6045 state
->symbols
->push_scope();
6047 if (init_statement
!= NULL
)
6048 init_statement
->hir(instructions
, state
);
6050 ir_loop
*const stmt
= new(ctx
) ir_loop();
6051 instructions
->push_tail(stmt
);
6053 /* Track the current loop nesting. */
6054 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6056 state
->loop_nesting_ast
= this;
6058 /* Likewise, indicate that following code is closest to a loop,
6059 * NOT closest to a switch.
6061 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6062 state
->switch_state
.is_switch_innermost
= false;
6064 if (mode
!= ast_do_while
)
6065 condition_to_hir(&stmt
->body_instructions
, state
);
6068 body
->hir(& stmt
->body_instructions
, state
);
6070 if (rest_expression
!= NULL
)
6071 rest_expression
->hir(& stmt
->body_instructions
, state
);
6073 if (mode
== ast_do_while
)
6074 condition_to_hir(&stmt
->body_instructions
, state
);
6076 if (mode
!= ast_do_while
)
6077 state
->symbols
->pop_scope();
6079 /* Restore previous nesting before returning. */
6080 state
->loop_nesting_ast
= nesting_ast
;
6081 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6083 /* Loops do not have r-values.
6090 * Determine if the given type is valid for establishing a default precision
6093 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6095 * "The precision statement
6097 * precision precision-qualifier type;
6099 * can be used to establish a default precision qualifier. The type field
6100 * can be either int or float or any of the sampler types, and the
6101 * precision-qualifier can be lowp, mediump, or highp."
6103 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6104 * qualifiers on sampler types, but this seems like an oversight (since the
6105 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6106 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6110 is_valid_default_precision_type(const struct glsl_type
*const type
)
6115 switch (type
->base_type
) {
6117 case GLSL_TYPE_FLOAT
:
6118 /* "int" and "float" are valid, but vectors and matrices are not. */
6119 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6120 case GLSL_TYPE_SAMPLER
:
6121 case GLSL_TYPE_IMAGE
:
6122 case GLSL_TYPE_ATOMIC_UINT
:
6131 ast_type_specifier::hir(exec_list
*instructions
,
6132 struct _mesa_glsl_parse_state
*state
)
6134 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6137 YYLTYPE loc
= this->get_location();
6139 /* If this is a precision statement, check that the type to which it is
6140 * applied is either float or int.
6142 * From section 4.5.3 of the GLSL 1.30 spec:
6143 * "The precision statement
6144 * precision precision-qualifier type;
6145 * can be used to establish a default precision qualifier. The type
6146 * field can be either int or float [...]. Any other types or
6147 * qualifiers will result in an error.
6149 if (this->default_precision
!= ast_precision_none
) {
6150 if (!state
->check_precision_qualifiers_allowed(&loc
))
6153 if (this->structure
!= NULL
) {
6154 _mesa_glsl_error(&loc
, state
,
6155 "precision qualifiers do not apply to structures");
6159 if (this->array_specifier
!= NULL
) {
6160 _mesa_glsl_error(&loc
, state
,
6161 "default precision statements do not apply to "
6166 const struct glsl_type
*const type
=
6167 state
->symbols
->get_type(this->type_name
);
6168 if (!is_valid_default_precision_type(type
)) {
6169 _mesa_glsl_error(&loc
, state
,
6170 "default precision statements apply only to "
6171 "float, int, and opaque types");
6175 if (state
->es_shader
) {
6176 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6179 * "Non-precision qualified declarations will use the precision
6180 * qualifier specified in the most recent precision statement
6181 * that is still in scope. The precision statement has the same
6182 * scoping rules as variable declarations. If it is declared
6183 * inside a compound statement, its effect stops at the end of
6184 * the innermost statement it was declared in. Precision
6185 * statements in nested scopes override precision statements in
6186 * outer scopes. Multiple precision statements for the same basic
6187 * type can appear inside the same scope, with later statements
6188 * overriding earlier statements within that scope."
6190 * Default precision specifications follow the same scope rules as
6191 * variables. So, we can track the state of the default precision
6192 * qualifiers in the symbol table, and the rules will just work. This
6193 * is a slight abuse of the symbol table, but it has the semantics
6196 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6197 this->default_precision
);
6200 /* FINISHME: Translate precision statements into IR. */
6204 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6205 * process_record_constructor() can do type-checking on C-style initializer
6206 * expressions of structs, but ast_struct_specifier should only be translated
6207 * to HIR if it is declaring the type of a structure.
6209 * The ->is_declaration field is false for initializers of variables
6210 * declared separately from the struct's type definition.
6212 * struct S { ... }; (is_declaration = true)
6213 * struct T { ... } t = { ... }; (is_declaration = true)
6214 * S s = { ... }; (is_declaration = false)
6216 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6217 return this->structure
->hir(instructions
, state
);
6224 * Process a structure or interface block tree into an array of structure fields
6226 * After parsing, where there are some syntax differnces, structures and
6227 * interface blocks are almost identical. They are similar enough that the
6228 * AST for each can be processed the same way into a set of
6229 * \c glsl_struct_field to describe the members.
6231 * If we're processing an interface block, var_mode should be the type of the
6232 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6233 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6237 * The number of fields processed. A pointer to the array structure fields is
6238 * stored in \c *fields_ret.
6241 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6242 struct _mesa_glsl_parse_state
*state
,
6243 exec_list
*declarations
,
6244 glsl_struct_field
**fields_ret
,
6246 enum glsl_matrix_layout matrix_layout
,
6247 bool allow_reserved_names
,
6248 ir_variable_mode var_mode
,
6249 ast_type_qualifier
*layout
,
6250 unsigned block_stream
,
6251 unsigned expl_location
)
6253 unsigned decl_count
= 0;
6255 /* Make an initial pass over the list of fields to determine how
6256 * many there are. Each element in this list is an ast_declarator_list.
6257 * This means that we actually need to count the number of elements in the
6258 * 'declarations' list in each of the elements.
6260 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6261 decl_count
+= decl_list
->declarations
.length();
6264 /* Allocate storage for the fields and process the field
6265 * declarations. As the declarations are processed, try to also convert
6266 * the types to HIR. This ensures that structure definitions embedded in
6267 * other structure definitions or in interface blocks are processed.
6269 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
6272 bool first_member
= true;
6273 bool first_member_has_explicit_location
;
6276 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6277 const char *type_name
;
6278 YYLTYPE loc
= decl_list
->get_location();
6280 decl_list
->type
->specifier
->hir(instructions
, state
);
6282 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6284 * "Anonymous structures are not supported; so embedded structures
6285 * must have a declarator. A name given to an embedded struct is
6286 * scoped at the same level as the struct it is embedded in."
6288 * The same section of the GLSL 1.20 spec says:
6290 * "Anonymous structures are not supported. Embedded structures are
6293 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6294 * embedded structures in 1.10 only.
6296 if (state
->language_version
!= 110 &&
6297 decl_list
->type
->specifier
->structure
!= NULL
)
6298 _mesa_glsl_error(&loc
, state
,
6299 "embedded structure declarations are not allowed");
6301 const glsl_type
*decl_type
=
6302 decl_list
->type
->glsl_type(& type_name
, state
);
6304 const struct ast_type_qualifier
*const qual
=
6305 &decl_list
->type
->qualifier
;
6307 /* From section 4.3.9 of the GLSL 4.40 spec:
6309 * "[In interface blocks] opaque types are not allowed."
6311 * It should be impossible for decl_type to be NULL here. Cases that
6312 * might naturally lead to decl_type being NULL, especially for the
6313 * is_interface case, will have resulted in compilation having
6314 * already halted due to a syntax error.
6319 if (decl_type
->contains_opaque()) {
6320 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6321 "interface block contains opaque variable");
6324 if (decl_type
->contains_atomic()) {
6325 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6327 * "Members of structures cannot be declared as atomic counter
6330 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6333 if (decl_type
->contains_image()) {
6334 /* FINISHME: Same problem as with atomic counters.
6335 * FINISHME: Request clarification from Khronos and add
6336 * FINISHME: spec quotation here.
6338 _mesa_glsl_error(&loc
, state
, "image in structure");
6342 if (qual
->flags
.q
.explicit_binding
) {
6343 _mesa_glsl_error(&loc
, state
,
6344 "binding layout qualifier cannot be applied "
6345 "to struct or interface block members");
6349 if (!first_member
) {
6350 if (!layout
->flags
.q
.explicit_location
&&
6351 ((first_member_has_explicit_location
&&
6352 !qual
->flags
.q
.explicit_location
) ||
6353 (!first_member_has_explicit_location
&&
6354 qual
->flags
.q
.explicit_location
))) {
6355 _mesa_glsl_error(&loc
, state
,
6356 "when block-level location layout qualifier "
6357 "is not supplied either all members must "
6358 "have a location layout qualifier or all "
6359 "members must not have a location layout "
6363 first_member
= false;
6364 first_member_has_explicit_location
=
6365 qual
->flags
.q
.explicit_location
;
6369 if (qual
->flags
.q
.std140
||
6370 qual
->flags
.q
.std430
||
6371 qual
->flags
.q
.packed
||
6372 qual
->flags
.q
.shared
) {
6373 _mesa_glsl_error(&loc
, state
,
6374 "uniform/shader storage block layout qualifiers "
6375 "std140, std430, packed, and shared can only be "
6376 "applied to uniform/shader storage blocks, not "
6380 if (qual
->flags
.q
.constant
) {
6381 _mesa_glsl_error(&loc
, state
,
6382 "const storage qualifier cannot be applied "
6383 "to struct or interface block members");
6386 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6388 * "A block member may be declared with a stream identifier, but
6389 * the specified stream must match the stream associated with the
6390 * containing block."
6392 if (qual
->flags
.q
.explicit_stream
) {
6393 unsigned qual_stream
;
6394 if (process_qualifier_constant(state
, &loc
, "stream",
6395 qual
->stream
, &qual_stream
) &&
6396 qual_stream
!= block_stream
) {
6397 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6398 "interface block member does not match "
6399 "the interface block (%u vs %u)", qual_stream
,
6404 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6405 _mesa_glsl_error(&loc
, state
,
6406 "interpolation qualifiers cannot be used "
6407 "with uniform interface blocks");
6410 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6411 qual
->has_auxiliary_storage()) {
6412 _mesa_glsl_error(&loc
, state
,
6413 "auxiliary storage qualifiers cannot be used "
6414 "in uniform blocks or structures.");
6417 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6418 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6419 _mesa_glsl_error(&loc
, state
,
6420 "row_major and column_major can only be "
6421 "applied to interface blocks");
6423 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6426 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6427 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6428 "readonly and writeonly.");
6431 foreach_list_typed (ast_declaration
, decl
, link
,
6432 &decl_list
->declarations
) {
6433 YYLTYPE loc
= decl
->get_location();
6435 if (!allow_reserved_names
)
6436 validate_identifier(decl
->identifier
, loc
, state
);
6438 const struct glsl_type
*field_type
=
6439 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6440 validate_array_dimensions(field_type
, state
, &loc
);
6441 fields
[i
].type
= field_type
;
6442 fields
[i
].name
= decl
->identifier
;
6443 fields
[i
].interpolation
=
6444 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
6445 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6446 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6447 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6448 fields
[i
].precision
= qual
->precision
;
6450 if (qual
->flags
.q
.explicit_location
) {
6451 unsigned qual_location
;
6452 if (process_qualifier_constant(state
, &loc
, "location",
6453 qual
->location
, &qual_location
)) {
6454 fields
[i
].location
= VARYING_SLOT_VAR0
+ qual_location
;
6455 expl_location
= fields
[i
].location
+
6456 fields
[i
].type
->count_attribute_slots(false);
6459 if (layout
&& layout
->flags
.q
.explicit_location
) {
6460 fields
[i
].location
= expl_location
;
6461 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6463 fields
[i
].location
= -1;
6467 /* Propogate row- / column-major information down the fields of the
6468 * structure or interface block. Structures need this data because
6469 * the structure may contain a structure that contains ... a matrix
6470 * that need the proper layout.
6472 if (field_type
->without_array()->is_matrix()
6473 || field_type
->without_array()->is_record()) {
6474 /* If no layout is specified for the field, inherit the layout
6477 fields
[i
].matrix_layout
= matrix_layout
;
6479 if (qual
->flags
.q
.row_major
)
6480 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6481 else if (qual
->flags
.q
.column_major
)
6482 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6484 /* If we're processing an interface block, the matrix layout must
6485 * be decided by this point.
6487 assert(!is_interface
6488 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
6489 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
6492 /* Image qualifiers are allowed on buffer variables, which can only
6493 * be defined inside shader storage buffer objects
6495 if (layout
&& var_mode
== ir_var_shader_storage
) {
6496 /* For readonly and writeonly qualifiers the field definition,
6497 * if set, overwrites the layout qualifier.
6499 if (qual
->flags
.q
.read_only
) {
6500 fields
[i
].image_read_only
= true;
6501 fields
[i
].image_write_only
= false;
6502 } else if (qual
->flags
.q
.write_only
) {
6503 fields
[i
].image_read_only
= false;
6504 fields
[i
].image_write_only
= true;
6506 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
6507 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
6510 /* For other qualifiers, we set the flag if either the layout
6511 * qualifier or the field qualifier are set
6513 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
6514 layout
->flags
.q
.coherent
;
6515 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
6516 layout
->flags
.q
._volatile
;
6517 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
6518 layout
->flags
.q
.restrict_flag
;
6525 assert(i
== decl_count
);
6527 *fields_ret
= fields
;
6533 ast_struct_specifier::hir(exec_list
*instructions
,
6534 struct _mesa_glsl_parse_state
*state
)
6536 YYLTYPE loc
= this->get_location();
6538 unsigned expl_location
= 0;
6539 if (layout
&& layout
->flags
.q
.explicit_location
) {
6540 if (!process_qualifier_constant(state
, &loc
, "location",
6541 layout
->location
, &expl_location
)) {
6544 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6548 glsl_struct_field
*fields
;
6549 unsigned decl_count
=
6550 ast_process_struct_or_iface_block_members(instructions
,
6552 &this->declarations
,
6555 GLSL_MATRIX_LAYOUT_INHERITED
,
6556 false /* allow_reserved_names */,
6559 0, /* for interface only */
6562 validate_identifier(this->name
, loc
, state
);
6564 const glsl_type
*t
=
6565 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
6567 if (!state
->symbols
->add_type(name
, t
)) {
6568 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
6570 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
6572 state
->num_user_structures
+ 1);
6574 s
[state
->num_user_structures
] = t
;
6575 state
->user_structures
= s
;
6576 state
->num_user_structures
++;
6580 /* Structure type definitions do not have r-values.
6587 * Visitor class which detects whether a given interface block has been used.
6589 class interface_block_usage_visitor
: public ir_hierarchical_visitor
6592 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
6593 : mode(mode
), block(block
), found(false)
6597 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
6599 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
6603 return visit_continue
;
6606 bool usage_found() const
6612 ir_variable_mode mode
;
6613 const glsl_type
*block
;
6618 is_unsized_array_last_element(ir_variable
*v
)
6620 const glsl_type
*interface_type
= v
->get_interface_type();
6621 int length
= interface_type
->length
;
6623 assert(v
->type
->is_unsized_array());
6625 /* Check if it is the last element of the interface */
6626 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
6632 ast_interface_block::hir(exec_list
*instructions
,
6633 struct _mesa_glsl_parse_state
*state
)
6635 YYLTYPE loc
= this->get_location();
6637 /* Interface blocks must be declared at global scope */
6638 if (state
->current_function
!= NULL
) {
6639 _mesa_glsl_error(&loc
, state
,
6640 "Interface block `%s' must be declared "
6645 if (!this->layout
.flags
.q
.buffer
&&
6646 this->layout
.flags
.q
.std430
) {
6647 _mesa_glsl_error(&loc
, state
,
6648 "std430 storage block layout qualifier is supported "
6649 "only for shader storage blocks");
6652 /* The ast_interface_block has a list of ast_declarator_lists. We
6653 * need to turn those into ir_variables with an association
6654 * with this uniform block.
6656 enum glsl_interface_packing packing
;
6657 if (this->layout
.flags
.q
.shared
) {
6658 packing
= GLSL_INTERFACE_PACKING_SHARED
;
6659 } else if (this->layout
.flags
.q
.packed
) {
6660 packing
= GLSL_INTERFACE_PACKING_PACKED
;
6661 } else if (this->layout
.flags
.q
.std430
) {
6662 packing
= GLSL_INTERFACE_PACKING_STD430
;
6664 /* The default layout is std140.
6666 packing
= GLSL_INTERFACE_PACKING_STD140
;
6669 ir_variable_mode var_mode
;
6670 const char *iface_type_name
;
6671 if (this->layout
.flags
.q
.in
) {
6672 var_mode
= ir_var_shader_in
;
6673 iface_type_name
= "in";
6674 } else if (this->layout
.flags
.q
.out
) {
6675 var_mode
= ir_var_shader_out
;
6676 iface_type_name
= "out";
6677 } else if (this->layout
.flags
.q
.uniform
) {
6678 var_mode
= ir_var_uniform
;
6679 iface_type_name
= "uniform";
6680 } else if (this->layout
.flags
.q
.buffer
) {
6681 var_mode
= ir_var_shader_storage
;
6682 iface_type_name
= "buffer";
6684 var_mode
= ir_var_auto
;
6685 iface_type_name
= "UNKNOWN";
6686 assert(!"interface block layout qualifier not found!");
6689 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
6690 if (this->layout
.flags
.q
.row_major
)
6691 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
6692 else if (this->layout
.flags
.q
.column_major
)
6693 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
6695 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
6696 exec_list declared_variables
;
6697 glsl_struct_field
*fields
;
6699 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
6700 * that we don't have incompatible qualifiers
6702 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
6703 _mesa_glsl_error(&loc
, state
,
6704 "Interface block sets both readonly and writeonly");
6707 unsigned qual_stream
;
6708 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
6710 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
6711 /* If the stream qualifier is invalid it doesn't make sense to continue
6712 * on and try to compare stream layouts on member variables against it
6713 * so just return early.
6718 unsigned expl_location
= 0;
6719 if (layout
.flags
.q
.explicit_location
) {
6720 if (!process_qualifier_constant(state
, &loc
, "location",
6721 layout
.location
, &expl_location
)) {
6724 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
6728 unsigned int num_variables
=
6729 ast_process_struct_or_iface_block_members(&declared_variables
,
6731 &this->declarations
,
6735 redeclaring_per_vertex
,
6741 if (!redeclaring_per_vertex
) {
6742 validate_identifier(this->block_name
, loc
, state
);
6744 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
6746 * "Block names have no other use within a shader beyond interface
6747 * matching; it is a compile-time error to use a block name at global
6748 * scope for anything other than as a block name."
6750 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
6751 if (var
&& !var
->type
->is_interface()) {
6752 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
6753 "already used in the scope.",
6758 const glsl_type
*earlier_per_vertex
= NULL
;
6759 if (redeclaring_per_vertex
) {
6760 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
6761 * the named interface block gl_in, we can find it by looking at the
6762 * previous declaration of gl_in. Otherwise we can find it by looking
6763 * at the previous decalartion of any of the built-in outputs,
6766 * Also check that the instance name and array-ness of the redeclaration
6770 case ir_var_shader_in
:
6771 if (ir_variable
*earlier_gl_in
=
6772 state
->symbols
->get_variable("gl_in")) {
6773 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6775 _mesa_glsl_error(&loc
, state
,
6776 "redeclaration of gl_PerVertex input not allowed "
6778 _mesa_shader_stage_to_string(state
->stage
));
6780 if (this->instance_name
== NULL
||
6781 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
6782 !this->array_specifier
->is_single_dimension()) {
6783 _mesa_glsl_error(&loc
, state
,
6784 "gl_PerVertex input must be redeclared as "
6788 case ir_var_shader_out
:
6789 if (ir_variable
*earlier_gl_Position
=
6790 state
->symbols
->get_variable("gl_Position")) {
6791 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6792 } else if (ir_variable
*earlier_gl_out
=
6793 state
->symbols
->get_variable("gl_out")) {
6794 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6796 _mesa_glsl_error(&loc
, state
,
6797 "redeclaration of gl_PerVertex output not "
6798 "allowed in the %s shader",
6799 _mesa_shader_stage_to_string(state
->stage
));
6801 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6802 if (this->instance_name
== NULL
||
6803 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6804 _mesa_glsl_error(&loc
, state
,
6805 "gl_PerVertex output must be redeclared as "
6809 if (this->instance_name
!= NULL
) {
6810 _mesa_glsl_error(&loc
, state
,
6811 "gl_PerVertex output may not be redeclared with "
6812 "an instance name");
6817 _mesa_glsl_error(&loc
, state
,
6818 "gl_PerVertex must be declared as an input or an "
6823 if (earlier_per_vertex
== NULL
) {
6824 /* An error has already been reported. Bail out to avoid null
6825 * dereferences later in this function.
6830 /* Copy locations from the old gl_PerVertex interface block. */
6831 for (unsigned i
= 0; i
< num_variables
; i
++) {
6832 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6834 _mesa_glsl_error(&loc
, state
,
6835 "redeclaration of gl_PerVertex must be a subset "
6836 "of the built-in members of gl_PerVertex");
6838 fields
[i
].location
=
6839 earlier_per_vertex
->fields
.structure
[j
].location
;
6840 fields
[i
].interpolation
=
6841 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6842 fields
[i
].centroid
=
6843 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6845 earlier_per_vertex
->fields
.structure
[j
].sample
;
6847 earlier_per_vertex
->fields
.structure
[j
].patch
;
6848 fields
[i
].precision
=
6849 earlier_per_vertex
->fields
.structure
[j
].precision
;
6853 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
6856 * If a built-in interface block is redeclared, it must appear in
6857 * the shader before any use of any member included in the built-in
6858 * declaration, or a compilation error will result.
6860 * This appears to be a clarification to the behaviour established for
6861 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
6862 * regardless of GLSL version.
6864 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
6865 v
.run(instructions
);
6866 if (v
.usage_found()) {
6867 _mesa_glsl_error(&loc
, state
,
6868 "redeclaration of a built-in interface block must "
6869 "appear before any use of any member of the "
6874 const glsl_type
*block_type
=
6875 glsl_type::get_interface_instance(fields
,
6880 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
6881 YYLTYPE loc
= this->get_location();
6882 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
6883 "already taken in the current scope",
6884 this->block_name
, iface_type_name
);
6887 /* Since interface blocks cannot contain statements, it should be
6888 * impossible for the block to generate any instructions.
6890 assert(declared_variables
.is_empty());
6892 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
6894 * Geometry shader input variables get the per-vertex values written
6895 * out by vertex shader output variables of the same names. Since a
6896 * geometry shader operates on a set of vertices, each input varying
6897 * variable (or input block, see interface blocks below) needs to be
6898 * declared as an array.
6900 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
6901 var_mode
== ir_var_shader_in
) {
6902 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
6903 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6904 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
6905 this->array_specifier
== NULL
&&
6906 var_mode
== ir_var_shader_in
) {
6907 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
6908 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
6909 this->array_specifier
== NULL
&&
6910 var_mode
== ir_var_shader_out
) {
6911 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
6915 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
6918 * "If an instance name (instance-name) is used, then it puts all the
6919 * members inside a scope within its own name space, accessed with the
6920 * field selector ( . ) operator (analogously to structures)."
6922 if (this->instance_name
) {
6923 if (redeclaring_per_vertex
) {
6924 /* When a built-in in an unnamed interface block is redeclared,
6925 * get_variable_being_redeclared() calls
6926 * check_builtin_array_max_size() to make sure that built-in array
6927 * variables aren't redeclared to illegal sizes. But we're looking
6928 * at a redeclaration of a named built-in interface block. So we
6929 * have to manually call check_builtin_array_max_size() for all parts
6930 * of the interface that are arrays.
6932 for (unsigned i
= 0; i
< num_variables
; i
++) {
6933 if (fields
[i
].type
->is_array()) {
6934 const unsigned size
= fields
[i
].type
->array_size();
6935 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
6939 validate_identifier(this->instance_name
, loc
, state
);
6944 if (this->array_specifier
!= NULL
) {
6945 const glsl_type
*block_array_type
=
6946 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
6948 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
6950 * For uniform blocks declared an array, each individual array
6951 * element corresponds to a separate buffer object backing one
6952 * instance of the block. As the array size indicates the number
6953 * of buffer objects needed, uniform block array declarations
6954 * must specify an array size.
6956 * And a few paragraphs later:
6958 * Geometry shader input blocks must be declared as arrays and
6959 * follow the array declaration and linking rules for all
6960 * geometry shader inputs. All other input and output block
6961 * arrays must specify an array size.
6963 * The same applies to tessellation shaders.
6965 * The upshot of this is that the only circumstance where an
6966 * interface array size *doesn't* need to be specified is on a
6967 * geometry shader input, tessellation control shader input,
6968 * tessellation control shader output, and tessellation evaluation
6971 if (block_array_type
->is_unsized_array()) {
6972 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
6973 state
->stage
== MESA_SHADER_TESS_CTRL
||
6974 state
->stage
== MESA_SHADER_TESS_EVAL
;
6975 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
6977 if (this->layout
.flags
.q
.in
) {
6979 _mesa_glsl_error(&loc
, state
,
6980 "unsized input block arrays not allowed in "
6982 _mesa_shader_stage_to_string(state
->stage
));
6983 } else if (this->layout
.flags
.q
.out
) {
6985 _mesa_glsl_error(&loc
, state
,
6986 "unsized output block arrays not allowed in "
6988 _mesa_shader_stage_to_string(state
->stage
));
6990 /* by elimination, this is a uniform block array */
6991 _mesa_glsl_error(&loc
, state
,
6992 "unsized uniform block arrays not allowed in "
6994 _mesa_shader_stage_to_string(state
->stage
));
6998 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7000 * * Arrays of arrays of blocks are not allowed
7002 if (state
->es_shader
&& block_array_type
->is_array() &&
7003 block_array_type
->fields
.array
->is_array()) {
7004 _mesa_glsl_error(&loc
, state
,
7005 "arrays of arrays interface blocks are "
7009 var
= new(state
) ir_variable(block_array_type
,
7010 this->instance_name
,
7013 var
= new(state
) ir_variable(block_type
,
7014 this->instance_name
,
7018 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7019 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7021 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7022 var
->data
.read_only
= true;
7024 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7025 handle_geometry_shader_input_decl(state
, loc
, var
);
7026 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7027 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7028 handle_tess_shader_input_decl(state
, loc
, var
);
7029 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7030 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7032 for (unsigned i
= 0; i
< num_variables
; i
++) {
7033 if (fields
[i
].type
->is_unsized_array()) {
7034 if (var_mode
== ir_var_shader_storage
) {
7035 if (i
!= (num_variables
- 1)) {
7036 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7037 "only last member of a shader storage block "
7038 "can be defined as unsized array",
7042 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7044 * "If an array is declared as the last member of a shader storage
7045 * block and the size is not specified at compile-time, it is
7046 * sized at run-time. In all other cases, arrays are sized only
7049 if (state
->es_shader
) {
7050 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7051 "only last member of a shader storage block "
7052 "can be defined as unsized array",
7059 if (ir_variable
*earlier
=
7060 state
->symbols
->get_variable(this->instance_name
)) {
7061 if (!redeclaring_per_vertex
) {
7062 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7063 this->instance_name
);
7065 earlier
->data
.how_declared
= ir_var_declared_normally
;
7066 earlier
->type
= var
->type
;
7067 earlier
->reinit_interface_type(block_type
);
7070 if (this->layout
.flags
.q
.explicit_binding
) {
7071 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7075 var
->data
.stream
= qual_stream
;
7076 if (layout
.flags
.q
.explicit_location
) {
7077 var
->data
.location
= expl_location
;
7078 var
->data
.explicit_location
= true;
7081 state
->symbols
->add_variable(var
);
7082 instructions
->push_tail(var
);
7085 /* In order to have an array size, the block must also be declared with
7088 assert(this->array_specifier
== NULL
);
7090 for (unsigned i
= 0; i
< num_variables
; i
++) {
7092 new(state
) ir_variable(fields
[i
].type
,
7093 ralloc_strdup(state
, fields
[i
].name
),
7095 var
->data
.interpolation
= fields
[i
].interpolation
;
7096 var
->data
.centroid
= fields
[i
].centroid
;
7097 var
->data
.sample
= fields
[i
].sample
;
7098 var
->data
.patch
= fields
[i
].patch
;
7099 var
->data
.stream
= qual_stream
;
7100 var
->data
.location
= fields
[i
].location
;
7101 if (fields
[i
].location
!= -1)
7102 var
->data
.explicit_location
= true;
7103 var
->init_interface_type(block_type
);
7105 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7106 var
->data
.read_only
= true;
7108 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7109 if (state
->es_shader
) {
7110 var
->data
.precision
=
7111 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7115 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7116 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7117 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7119 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7122 if (var
->data
.mode
== ir_var_shader_storage
) {
7123 var
->data
.image_read_only
= fields
[i
].image_read_only
;
7124 var
->data
.image_write_only
= fields
[i
].image_write_only
;
7125 var
->data
.image_coherent
= fields
[i
].image_coherent
;
7126 var
->data
.image_volatile
= fields
[i
].image_volatile
;
7127 var
->data
.image_restrict
= fields
[i
].image_restrict
;
7130 /* Examine var name here since var may get deleted in the next call */
7131 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7133 if (redeclaring_per_vertex
) {
7134 ir_variable
*earlier
=
7135 get_variable_being_redeclared(var
, loc
, state
,
7136 true /* allow_all_redeclarations */);
7137 if (!var_is_gl_id
|| earlier
== NULL
) {
7138 _mesa_glsl_error(&loc
, state
,
7139 "redeclaration of gl_PerVertex can only "
7140 "include built-in variables");
7141 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
7142 _mesa_glsl_error(&loc
, state
,
7143 "`%s' has already been redeclared",
7146 earlier
->data
.how_declared
= ir_var_declared_in_block
;
7147 earlier
->reinit_interface_type(block_type
);
7152 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7153 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7155 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7156 * The UBO declaration itself doesn't get an ir_variable unless it
7157 * has an instance name. This is ugly.
7159 if (this->layout
.flags
.q
.explicit_binding
) {
7160 apply_explicit_binding(state
, &loc
, var
,
7161 var
->get_interface_type(), &this->layout
);
7164 if (var
->type
->is_unsized_array()) {
7165 if (var
->is_in_shader_storage_block()) {
7166 if (!is_unsized_array_last_element(var
)) {
7167 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7168 "only last member of a shader storage block "
7169 "can be defined as unsized array",
7172 var
->data
.from_ssbo_unsized_array
= true;
7174 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7176 * "If an array is declared as the last member of a shader storage
7177 * block and the size is not specified at compile-time, it is
7178 * sized at run-time. In all other cases, arrays are sized only
7181 if (state
->es_shader
) {
7182 _mesa_glsl_error(&loc
, state
, "unsized array `%s' definition: "
7183 "only last member of a shader storage block "
7184 "can be defined as unsized array",
7190 state
->symbols
->add_variable(var
);
7191 instructions
->push_tail(var
);
7194 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7195 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7197 * It is also a compilation error ... to redeclare a built-in
7198 * block and then use a member from that built-in block that was
7199 * not included in the redeclaration.
7201 * This appears to be a clarification to the behaviour established
7202 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7203 * behaviour regardless of GLSL version.
7205 * To prevent the shader from using a member that was not included in
7206 * the redeclaration, we disable any ir_variables that are still
7207 * associated with the old declaration of gl_PerVertex (since we've
7208 * already updated all of the variables contained in the new
7209 * gl_PerVertex to point to it).
7211 * As a side effect this will prevent
7212 * validate_intrastage_interface_blocks() from getting confused and
7213 * thinking there are conflicting definitions of gl_PerVertex in the
7216 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7217 ir_variable
*const var
= node
->as_variable();
7219 var
->get_interface_type() == earlier_per_vertex
&&
7220 var
->data
.mode
== var_mode
) {
7221 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7222 _mesa_glsl_error(&loc
, state
,
7223 "redeclaration of gl_PerVertex cannot "
7224 "follow a redeclaration of `%s'",
7227 state
->symbols
->disable_variable(var
->name
);
7239 ast_tcs_output_layout::hir(exec_list
*instructions
,
7240 struct _mesa_glsl_parse_state
*state
)
7242 YYLTYPE loc
= this->get_location();
7244 unsigned num_vertices
;
7245 if (!state
->out_qualifier
->vertices
->
7246 process_qualifier_constant(state
, "vertices", &num_vertices
,
7248 /* return here to stop cascading incorrect error messages */
7252 /* If any shader outputs occurred before this declaration and specified an
7253 * array size, make sure the size they specified is consistent with the
7256 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
7257 _mesa_glsl_error(&loc
, state
,
7258 "this tessellation control shader output layout "
7259 "specifies %u vertices, but a previous output "
7260 "is declared with size %u",
7261 num_vertices
, state
->tcs_output_size
);
7265 state
->tcs_output_vertices_specified
= true;
7267 /* If any shader outputs occurred before this declaration and did not
7268 * specify an array size, their size is determined now.
7270 foreach_in_list (ir_instruction
, node
, instructions
) {
7271 ir_variable
*var
= node
->as_variable();
7272 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
7275 /* Note: Not all tessellation control shader output are arrays. */
7276 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
7279 if (var
->data
.max_array_access
>= num_vertices
) {
7280 _mesa_glsl_error(&loc
, state
,
7281 "this tessellation control shader output layout "
7282 "specifies %u vertices, but an access to element "
7283 "%u of output `%s' already exists", num_vertices
,
7284 var
->data
.max_array_access
, var
->name
);
7286 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7296 ast_gs_input_layout::hir(exec_list
*instructions
,
7297 struct _mesa_glsl_parse_state
*state
)
7299 YYLTYPE loc
= this->get_location();
7301 /* If any geometry input layout declaration preceded this one, make sure it
7302 * was consistent with this one.
7304 if (state
->gs_input_prim_type_specified
&&
7305 state
->in_qualifier
->prim_type
!= this->prim_type
) {
7306 _mesa_glsl_error(&loc
, state
,
7307 "geometry shader input layout does not match"
7308 " previous declaration");
7312 /* If any shader inputs occurred before this declaration and specified an
7313 * array size, make sure the size they specified is consistent with the
7316 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
7317 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
7318 _mesa_glsl_error(&loc
, state
,
7319 "this geometry shader input layout implies %u vertices"
7320 " per primitive, but a previous input is declared"
7321 " with size %u", num_vertices
, state
->gs_input_size
);
7325 state
->gs_input_prim_type_specified
= true;
7327 /* If any shader inputs occurred before this declaration and did not
7328 * specify an array size, their size is determined now.
7330 foreach_in_list(ir_instruction
, node
, instructions
) {
7331 ir_variable
*var
= node
->as_variable();
7332 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
7335 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
7339 if (var
->type
->is_unsized_array()) {
7340 if (var
->data
.max_array_access
>= num_vertices
) {
7341 _mesa_glsl_error(&loc
, state
,
7342 "this geometry shader input layout implies %u"
7343 " vertices, but an access to element %u of input"
7344 " `%s' already exists", num_vertices
,
7345 var
->data
.max_array_access
, var
->name
);
7347 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
7358 ast_cs_input_layout::hir(exec_list
*instructions
,
7359 struct _mesa_glsl_parse_state
*state
)
7361 YYLTYPE loc
= this->get_location();
7363 /* From the ARB_compute_shader specification:
7365 * If the local size of the shader in any dimension is greater
7366 * than the maximum size supported by the implementation for that
7367 * dimension, a compile-time error results.
7369 * It is not clear from the spec how the error should be reported if
7370 * the total size of the work group exceeds
7371 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
7372 * report it at compile time as well.
7374 GLuint64 total_invocations
= 1;
7375 unsigned qual_local_size
[3];
7376 for (int i
= 0; i
< 3; i
++) {
7378 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
7380 /* Infer a local_size of 1 for unspecified dimensions */
7381 if (this->local_size
[i
] == NULL
) {
7382 qual_local_size
[i
] = 1;
7383 } else if (!this->local_size
[i
]->
7384 process_qualifier_constant(state
, local_size_str
,
7385 &qual_local_size
[i
], false)) {
7386 ralloc_free(local_size_str
);
7389 ralloc_free(local_size_str
);
7391 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
7392 _mesa_glsl_error(&loc
, state
,
7393 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
7395 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
7398 total_invocations
*= qual_local_size
[i
];
7399 if (total_invocations
>
7400 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
7401 _mesa_glsl_error(&loc
, state
,
7402 "product of local_sizes exceeds "
7403 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
7404 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
7409 /* If any compute input layout declaration preceded this one, make sure it
7410 * was consistent with this one.
7412 if (state
->cs_input_local_size_specified
) {
7413 for (int i
= 0; i
< 3; i
++) {
7414 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
7415 _mesa_glsl_error(&loc
, state
,
7416 "compute shader input layout does not match"
7417 " previous declaration");
7423 state
->cs_input_local_size_specified
= true;
7424 for (int i
= 0; i
< 3; i
++)
7425 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
7427 /* We may now declare the built-in constant gl_WorkGroupSize (see
7428 * builtin_variable_generator::generate_constants() for why we didn't
7429 * declare it earlier).
7431 ir_variable
*var
= new(state
->symbols
)
7432 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
7433 var
->data
.how_declared
= ir_var_declared_implicitly
;
7434 var
->data
.read_only
= true;
7435 instructions
->push_tail(var
);
7436 state
->symbols
->add_variable(var
);
7437 ir_constant_data data
;
7438 memset(&data
, 0, sizeof(data
));
7439 for (int i
= 0; i
< 3; i
++)
7440 data
.u
[i
] = qual_local_size
[i
];
7441 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7442 var
->constant_initializer
=
7443 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
7444 var
->data
.has_initializer
= true;
7451 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
7452 exec_list
*instructions
)
7454 bool gl_FragColor_assigned
= false;
7455 bool gl_FragData_assigned
= false;
7456 bool gl_FragSecondaryColor_assigned
= false;
7457 bool gl_FragSecondaryData_assigned
= false;
7458 bool user_defined_fs_output_assigned
= false;
7459 ir_variable
*user_defined_fs_output
= NULL
;
7461 /* It would be nice to have proper location information. */
7463 memset(&loc
, 0, sizeof(loc
));
7465 foreach_in_list(ir_instruction
, node
, instructions
) {
7466 ir_variable
*var
= node
->as_variable();
7468 if (!var
|| !var
->data
.assigned
)
7471 if (strcmp(var
->name
, "gl_FragColor") == 0)
7472 gl_FragColor_assigned
= true;
7473 else if (strcmp(var
->name
, "gl_FragData") == 0)
7474 gl_FragData_assigned
= true;
7475 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
7476 gl_FragSecondaryColor_assigned
= true;
7477 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
7478 gl_FragSecondaryData_assigned
= true;
7479 else if (!is_gl_identifier(var
->name
)) {
7480 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
7481 var
->data
.mode
== ir_var_shader_out
) {
7482 user_defined_fs_output_assigned
= true;
7483 user_defined_fs_output
= var
;
7488 /* From the GLSL 1.30 spec:
7490 * "If a shader statically assigns a value to gl_FragColor, it
7491 * may not assign a value to any element of gl_FragData. If a
7492 * shader statically writes a value to any element of
7493 * gl_FragData, it may not assign a value to
7494 * gl_FragColor. That is, a shader may assign values to either
7495 * gl_FragColor or gl_FragData, but not both. Multiple shaders
7496 * linked together must also consistently write just one of
7497 * these variables. Similarly, if user declared output
7498 * variables are in use (statically assigned to), then the
7499 * built-in variables gl_FragColor and gl_FragData may not be
7500 * assigned to. These incorrect usages all generate compile
7503 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
7504 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7505 "`gl_FragColor' and `gl_FragData'");
7506 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
7507 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7508 "`gl_FragColor' and `%s'",
7509 user_defined_fs_output
->name
);
7510 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
7511 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7512 "`gl_FragSecondaryColorEXT' and"
7513 " `gl_FragSecondaryDataEXT'");
7514 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
7515 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7516 "`gl_FragColor' and"
7517 " `gl_FragSecondaryDataEXT'");
7518 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
7519 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7521 " `gl_FragSecondaryColorEXT'");
7522 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
7523 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
7524 "`gl_FragData' and `%s'",
7525 user_defined_fs_output
->name
);
7528 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
7529 !state
->EXT_blend_func_extended_enable
) {
7530 _mesa_glsl_error(&loc
, state
,
7531 "Dual source blending requires EXT_blend_func_extended");
7537 remove_per_vertex_blocks(exec_list
*instructions
,
7538 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
7540 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
7541 * if it exists in this shader type.
7543 const glsl_type
*per_vertex
= NULL
;
7545 case ir_var_shader_in
:
7546 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
7547 per_vertex
= gl_in
->get_interface_type();
7549 case ir_var_shader_out
:
7550 if (ir_variable
*gl_Position
=
7551 state
->symbols
->get_variable("gl_Position")) {
7552 per_vertex
= gl_Position
->get_interface_type();
7556 assert(!"Unexpected mode");
7560 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
7561 * need to do anything.
7563 if (per_vertex
== NULL
)
7566 /* If the interface block is used by the shader, then we don't need to do
7569 interface_block_usage_visitor
v(mode
, per_vertex
);
7570 v
.run(instructions
);
7571 if (v
.usage_found())
7574 /* Remove any ir_variable declarations that refer to the interface block
7577 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7578 ir_variable
*const var
= node
->as_variable();
7579 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
7580 var
->data
.mode
== mode
) {
7581 state
->symbols
->disable_variable(var
->name
);