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 "util/hash_table.h"
57 #include "main/macros.h"
58 #include "main/shaderobj.h"
60 #include "ir_builder.h"
61 #include "builtin_functions.h"
63 using namespace ir_builder
;
66 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
67 exec_list
*instructions
);
69 remove_per_vertex_blocks(exec_list
*instructions
,
70 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
73 * Visitor class that finds the first instance of any write-only variable that
74 * is ever read, if any
76 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
79 read_from_write_only_variable_visitor() : found(NULL
)
83 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
85 if (this->in_assignee
)
86 return visit_continue
;
88 ir_variable
*var
= ir
->variable_referenced();
89 /* We can have image_write_only set on both images and buffer variables,
90 * but in the former there is a distinction between reads from
91 * the variable itself (write_only) and from the memory they point to
92 * (image_write_only), while in the case of buffer variables there is
93 * no such distinction, that is why this check here is limited to
94 * buffer variables alone.
96 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
97 return visit_continue
;
99 if (var
->data
.image_write_only
) {
104 return visit_continue
;
107 ir_variable
*get_variable() {
111 virtual ir_visitor_status
visit_enter(ir_expression
*ir
)
113 /* .length() doesn't actually read anything */
114 if (ir
->operation
== ir_unop_ssbo_unsized_array_length
)
115 return visit_continue_with_parent
;
117 return visit_continue
;
125 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
127 _mesa_glsl_initialize_variables(instructions
, state
);
129 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
131 state
->current_function
= NULL
;
133 state
->toplevel_ir
= instructions
;
135 state
->gs_input_prim_type_specified
= false;
136 state
->tcs_output_vertices_specified
= false;
137 state
->cs_input_local_size_specified
= false;
139 /* Section 4.2 of the GLSL 1.20 specification states:
140 * "The built-in functions are scoped in a scope outside the global scope
141 * users declare global variables in. That is, a shader's global scope,
142 * available for user-defined functions and global variables, is nested
143 * inside the scope containing the built-in functions."
145 * Since built-in functions like ftransform() access built-in variables,
146 * it follows that those must be in the outer scope as well.
148 * We push scope here to create this nesting effect...but don't pop.
149 * This way, a shader's globals are still in the symbol table for use
152 state
->symbols
->push_scope();
154 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
155 ast
->hir(instructions
, state
);
157 detect_recursion_unlinked(state
, instructions
);
158 detect_conflicting_assignments(state
, instructions
);
160 state
->toplevel_ir
= NULL
;
162 /* Move all of the variable declarations to the front of the IR list, and
163 * reverse the order. This has the (intended!) side effect that vertex
164 * shader inputs and fragment shader outputs will appear in the IR in the
165 * same order that they appeared in the shader code. This results in the
166 * locations being assigned in the declared order. Many (arguably buggy)
167 * applications depend on this behavior, and it matches what nearly all
170 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
171 ir_variable
*const var
= node
->as_variable();
177 instructions
->push_head(var
);
180 /* Figure out if gl_FragCoord is actually used in fragment shader */
181 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
183 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
185 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
187 * If multiple shaders using members of a built-in block belonging to
188 * the same interface are linked together in the same program, they
189 * must all redeclare the built-in block in the same way, as described
190 * in section 4.3.7 "Interface Blocks" for interface block matching, or
191 * a link error will result.
193 * The phrase "using members of a built-in block" implies that if two
194 * shaders are linked together and one of them *does not use* any members
195 * of the built-in block, then that shader does not need to have a matching
196 * redeclaration of the built-in block.
198 * This appears to be a clarification to the behaviour established for
199 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
202 * The definition of "interface" in section 4.3.7 that applies here is as
205 * The boundary between adjacent programmable pipeline stages: This
206 * spans all the outputs in all compilation units of the first stage
207 * and all the inputs in all compilation units of the second stage.
209 * Therefore this rule applies to both inter- and intra-stage linking.
211 * The easiest way to implement this is to check whether the shader uses
212 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
213 * remove all the relevant variable declaration from the IR, so that the
214 * linker won't see them and complain about mismatches.
216 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
217 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
219 /* Check that we don't have reads from write-only variables */
220 read_from_write_only_variable_visitor v
;
222 ir_variable
*error_var
= v
.get_variable();
224 /* It would be nice to have proper location information, but for that
225 * we would need to check this as we process each kind of AST node
228 memset(&loc
, 0, sizeof(loc
));
229 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
235 static ir_expression_operation
236 get_implicit_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
237 struct _mesa_glsl_parse_state
*state
)
239 switch (to
->base_type
) {
240 case GLSL_TYPE_FLOAT
:
241 switch (from
->base_type
) {
242 case GLSL_TYPE_INT
: return ir_unop_i2f
;
243 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
244 default: return (ir_expression_operation
)0;
248 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
249 && !state
->MESA_shader_integer_functions_enable
)
250 return (ir_expression_operation
)0;
251 switch (from
->base_type
) {
252 case GLSL_TYPE_INT
: return ir_unop_i2u
;
253 default: return (ir_expression_operation
)0;
256 case GLSL_TYPE_DOUBLE
:
257 if (!state
->has_double())
258 return (ir_expression_operation
)0;
259 switch (from
->base_type
) {
260 case GLSL_TYPE_INT
: return ir_unop_i2d
;
261 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
262 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
263 case GLSL_TYPE_INT64
: return ir_unop_i642d
;
264 case GLSL_TYPE_UINT64
: return ir_unop_u642d
;
265 default: return (ir_expression_operation
)0;
268 case GLSL_TYPE_UINT64
:
269 if (!state
->has_int64())
270 return (ir_expression_operation
)0;
271 switch (from
->base_type
) {
272 case GLSL_TYPE_INT
: return ir_unop_i2u64
;
273 case GLSL_TYPE_UINT
: return ir_unop_u2u64
;
274 case GLSL_TYPE_INT64
: return ir_unop_i642u64
;
275 default: return (ir_expression_operation
)0;
278 case GLSL_TYPE_INT64
:
279 if (!state
->has_int64())
280 return (ir_expression_operation
)0;
281 switch (from
->base_type
) {
282 case GLSL_TYPE_INT
: return ir_unop_i2i64
;
283 default: return (ir_expression_operation
)0;
286 default: return (ir_expression_operation
)0;
292 * If a conversion is available, convert one operand to a different type
294 * The \c from \c ir_rvalue is converted "in place".
296 * \param to Type that the operand it to be converted to
297 * \param from Operand that is being converted
298 * \param state GLSL compiler state
301 * If a conversion is possible (or unnecessary), \c true is returned.
302 * Otherwise \c false is returned.
305 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
306 struct _mesa_glsl_parse_state
*state
)
309 if (to
->base_type
== from
->type
->base_type
)
312 /* Prior to GLSL 1.20, there are no implicit conversions */
313 if (!state
->is_version(120, 0))
316 /* ESSL does not allow implicit conversions */
317 if (state
->es_shader
)
320 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
322 * "There are no implicit array or structure conversions. For
323 * example, an array of int cannot be implicitly converted to an
326 if (!to
->is_numeric() || !from
->type
->is_numeric())
329 /* We don't actually want the specific type `to`, we want a type
330 * with the same base type as `to`, but the same vector width as
333 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
334 from
->type
->matrix_columns
);
336 ir_expression_operation op
= get_implicit_conversion_operation(to
, from
->type
, state
);
338 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
346 static const struct glsl_type
*
347 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
349 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
351 const glsl_type
*type_a
= value_a
->type
;
352 const glsl_type
*type_b
= value_b
->type
;
354 /* From GLSL 1.50 spec, page 56:
356 * "The arithmetic binary operators add (+), subtract (-),
357 * multiply (*), and divide (/) operate on integer and
358 * floating-point scalars, vectors, and matrices."
360 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
361 _mesa_glsl_error(loc
, state
,
362 "operands to arithmetic operators must be numeric");
363 return glsl_type::error_type
;
367 /* "If one operand is floating-point based and the other is
368 * not, then the conversions from Section 4.1.10 "Implicit
369 * Conversions" are applied to the non-floating-point-based operand."
371 if (!apply_implicit_conversion(type_a
, value_b
, state
)
372 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
373 _mesa_glsl_error(loc
, state
,
374 "could not implicitly convert operands to "
375 "arithmetic operator");
376 return glsl_type::error_type
;
378 type_a
= value_a
->type
;
379 type_b
= value_b
->type
;
381 /* "If the operands are integer types, they must both be signed or
384 * From this rule and the preceeding conversion it can be inferred that
385 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
386 * The is_numeric check above already filtered out the case where either
387 * type is not one of these, so now the base types need only be tested for
390 if (type_a
->base_type
!= type_b
->base_type
) {
391 _mesa_glsl_error(loc
, state
,
392 "base type mismatch for arithmetic operator");
393 return glsl_type::error_type
;
396 /* "All arithmetic binary operators result in the same fundamental type
397 * (signed integer, unsigned integer, or floating-point) as the
398 * operands they operate on, after operand type conversion. After
399 * conversion, the following cases are valid
401 * * The two operands are scalars. In this case the operation is
402 * applied, resulting in a scalar."
404 if (type_a
->is_scalar() && type_b
->is_scalar())
407 /* "* One operand is a scalar, and the other is a vector or matrix.
408 * In this case, the scalar operation is applied independently to each
409 * component of the vector or matrix, resulting in the same size
412 if (type_a
->is_scalar()) {
413 if (!type_b
->is_scalar())
415 } else if (type_b
->is_scalar()) {
419 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
420 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
423 assert(!type_a
->is_scalar());
424 assert(!type_b
->is_scalar());
426 /* "* The two operands are vectors of the same size. In this case, the
427 * operation is done component-wise resulting in the same size
430 if (type_a
->is_vector() && type_b
->is_vector()) {
431 if (type_a
== type_b
) {
434 _mesa_glsl_error(loc
, state
,
435 "vector size mismatch for arithmetic operator");
436 return glsl_type::error_type
;
440 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
441 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
442 * <vector, vector> have been handled. At least one of the operands must
443 * be matrix. Further, since there are no integer matrix types, the base
444 * type of both operands must be float.
446 assert(type_a
->is_matrix() || type_b
->is_matrix());
447 assert(type_a
->is_float() || type_a
->is_double());
448 assert(type_b
->is_float() || type_b
->is_double());
450 /* "* The operator is add (+), subtract (-), or divide (/), and the
451 * operands are matrices with the same number of rows and the same
452 * number of columns. In this case, the operation is done component-
453 * wise resulting in the same size matrix."
454 * * The operator is multiply (*), where both operands are matrices or
455 * one operand is a vector and the other a matrix. A right vector
456 * operand is treated as a column vector and a left vector operand as a
457 * row vector. In all these cases, it is required that the number of
458 * columns of the left operand is equal to the number of rows of the
459 * right operand. Then, the multiply (*) operation does a linear
460 * algebraic multiply, yielding an object that has the same number of
461 * rows as the left operand and the same number of columns as the right
462 * operand. Section 5.10 "Vector and Matrix Operations" explains in
463 * more detail how vectors and matrices are operated on."
466 if (type_a
== type_b
)
469 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
471 if (type
== glsl_type::error_type
) {
472 _mesa_glsl_error(loc
, state
,
473 "size mismatch for matrix multiplication");
480 /* "All other cases are illegal."
482 _mesa_glsl_error(loc
, state
, "type mismatch");
483 return glsl_type::error_type
;
487 static const struct glsl_type
*
488 unary_arithmetic_result_type(const struct glsl_type
*type
,
489 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
491 /* From GLSL 1.50 spec, page 57:
493 * "The arithmetic unary operators negate (-), post- and pre-increment
494 * and decrement (-- and ++) operate on integer or floating-point
495 * values (including vectors and matrices). All unary operators work
496 * component-wise on their operands. These result with the same type
499 if (!type
->is_numeric()) {
500 _mesa_glsl_error(loc
, state
,
501 "operands to arithmetic operators must be numeric");
502 return glsl_type::error_type
;
509 * \brief Return the result type of a bit-logic operation.
511 * If the given types to the bit-logic operator are invalid, return
512 * glsl_type::error_type.
514 * \param value_a LHS of bit-logic op
515 * \param value_b RHS of bit-logic op
517 static const struct glsl_type
*
518 bit_logic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
520 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
522 const glsl_type
*type_a
= value_a
->type
;
523 const glsl_type
*type_b
= value_b
->type
;
525 if (!state
->check_bitwise_operations_allowed(loc
)) {
526 return glsl_type::error_type
;
529 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
531 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
532 * (|). The operands must be of type signed or unsigned integers or
535 if (!type_a
->is_integer_32_64()) {
536 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
537 ast_expression::operator_string(op
));
538 return glsl_type::error_type
;
540 if (!type_b
->is_integer_32_64()) {
541 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
542 ast_expression::operator_string(op
));
543 return glsl_type::error_type
;
546 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
547 * make sense for bitwise operations, as they don't operate on floats.
549 * GLSL 4.0 added implicit int -> uint conversions, which are relevant
550 * here. It wasn't clear whether or not we should apply them to bitwise
551 * operations. However, Khronos has decided that they should in future
552 * language revisions. Applications also rely on this behavior. We opt
553 * to apply them in general, but issue a portability warning.
555 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
557 if (type_a
->base_type
!= type_b
->base_type
) {
558 if (!apply_implicit_conversion(type_a
, value_b
, state
)
559 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
560 _mesa_glsl_error(loc
, state
,
561 "could not implicitly convert operands to "
563 ast_expression::operator_string(op
));
564 return glsl_type::error_type
;
566 _mesa_glsl_warning(loc
, state
,
567 "some implementations may not support implicit "
568 "int -> uint conversions for `%s' operators; "
569 "consider casting explicitly for portability",
570 ast_expression::operator_string(op
));
572 type_a
= value_a
->type
;
573 type_b
= value_b
->type
;
576 /* "The fundamental types of the operands (signed or unsigned) must
579 if (type_a
->base_type
!= type_b
->base_type
) {
580 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
581 "base type", ast_expression::operator_string(op
));
582 return glsl_type::error_type
;
585 /* "The operands cannot be vectors of differing size." */
586 if (type_a
->is_vector() &&
587 type_b
->is_vector() &&
588 type_a
->vector_elements
!= type_b
->vector_elements
) {
589 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
590 "different sizes", ast_expression::operator_string(op
));
591 return glsl_type::error_type
;
594 /* "If one operand is a scalar and the other a vector, the scalar is
595 * applied component-wise to the vector, resulting in the same type as
596 * the vector. The fundamental types of the operands [...] will be the
597 * resulting fundamental type."
599 if (type_a
->is_scalar())
605 static const struct glsl_type
*
606 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
607 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
609 const glsl_type
*type_a
= value_a
->type
;
610 const glsl_type
*type_b
= value_b
->type
;
612 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
613 return glsl_type::error_type
;
616 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
618 * "The operator modulus (%) operates on signed or unsigned integers or
621 if (!type_a
->is_integer_32_64()) {
622 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
623 return glsl_type::error_type
;
625 if (!type_b
->is_integer_32_64()) {
626 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
627 return glsl_type::error_type
;
630 /* "If the fundamental types in the operands do not match, then the
631 * conversions from section 4.1.10 "Implicit Conversions" are applied
632 * to create matching types."
634 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
635 * int -> uint conversion rules. Prior to that, there were no implicit
636 * conversions. So it's harmless to apply them universally - no implicit
637 * conversions will exist. If the types don't match, we'll receive false,
638 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
640 * "The operand types must both be signed or unsigned."
642 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
643 !apply_implicit_conversion(type_b
, value_a
, state
)) {
644 _mesa_glsl_error(loc
, state
,
645 "could not implicitly convert operands to "
646 "modulus (%%) operator");
647 return glsl_type::error_type
;
649 type_a
= value_a
->type
;
650 type_b
= value_b
->type
;
652 /* "The operands cannot be vectors of differing size. If one operand is
653 * a scalar and the other vector, then the scalar is applied component-
654 * wise to the vector, resulting in the same type as the vector. If both
655 * are vectors of the same size, the result is computed component-wise."
657 if (type_a
->is_vector()) {
658 if (!type_b
->is_vector()
659 || (type_a
->vector_elements
== type_b
->vector_elements
))
664 /* "The operator modulus (%) is not defined for any other data types
665 * (non-integer types)."
667 _mesa_glsl_error(loc
, state
, "type mismatch");
668 return glsl_type::error_type
;
672 static const struct glsl_type
*
673 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
674 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
676 const glsl_type
*type_a
= value_a
->type
;
677 const glsl_type
*type_b
= value_b
->type
;
679 /* From GLSL 1.50 spec, page 56:
680 * "The relational operators greater than (>), less than (<), greater
681 * than or equal (>=), and less than or equal (<=) operate only on
682 * scalar integer and scalar floating-point expressions."
684 if (!type_a
->is_numeric()
685 || !type_b
->is_numeric()
686 || !type_a
->is_scalar()
687 || !type_b
->is_scalar()) {
688 _mesa_glsl_error(loc
, state
,
689 "operands to relational operators must be scalar and "
691 return glsl_type::error_type
;
694 /* "Either the operands' types must match, or the conversions from
695 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
696 * operand, after which the types must match."
698 if (!apply_implicit_conversion(type_a
, value_b
, state
)
699 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
700 _mesa_glsl_error(loc
, state
,
701 "could not implicitly convert operands to "
702 "relational operator");
703 return glsl_type::error_type
;
705 type_a
= value_a
->type
;
706 type_b
= value_b
->type
;
708 if (type_a
->base_type
!= type_b
->base_type
) {
709 _mesa_glsl_error(loc
, state
, "base type mismatch");
710 return glsl_type::error_type
;
713 /* "The result is scalar Boolean."
715 return glsl_type::bool_type
;
719 * \brief Return the result type of a bit-shift operation.
721 * If the given types to the bit-shift operator are invalid, return
722 * glsl_type::error_type.
724 * \param type_a Type of LHS of bit-shift op
725 * \param type_b Type of RHS of bit-shift op
727 static const struct glsl_type
*
728 shift_result_type(const struct glsl_type
*type_a
,
729 const struct glsl_type
*type_b
,
731 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
733 if (!state
->check_bitwise_operations_allowed(loc
)) {
734 return glsl_type::error_type
;
737 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
739 * "The shift operators (<<) and (>>). For both operators, the operands
740 * must be signed or unsigned integers or integer vectors. One operand
741 * can be signed while the other is unsigned."
743 if (!type_a
->is_integer_32_64()) {
744 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
745 "integer vector", ast_expression::operator_string(op
));
746 return glsl_type::error_type
;
749 if (!type_b
->is_integer()) {
750 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
751 "integer vector", ast_expression::operator_string(op
));
752 return glsl_type::error_type
;
755 /* "If the first operand is a scalar, the second operand has to be
758 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
759 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
760 "second must be scalar as well",
761 ast_expression::operator_string(op
));
762 return glsl_type::error_type
;
765 /* If both operands are vectors, check that they have same number of
768 if (type_a
->is_vector() &&
769 type_b
->is_vector() &&
770 type_a
->vector_elements
!= type_b
->vector_elements
) {
771 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
772 "have same number of elements",
773 ast_expression::operator_string(op
));
774 return glsl_type::error_type
;
777 /* "In all cases, the resulting type will be the same type as the left
784 * Returns the innermost array index expression in an rvalue tree.
785 * This is the largest indexing level -- if an array of blocks, then
786 * it is the block index rather than an indexing expression for an
787 * array-typed member of an array of blocks.
790 find_innermost_array_index(ir_rvalue
*rv
)
792 ir_dereference_array
*last
= NULL
;
794 if (rv
->as_dereference_array()) {
795 last
= rv
->as_dereference_array();
797 } else if (rv
->as_dereference_record())
798 rv
= rv
->as_dereference_record()->record
;
799 else if (rv
->as_swizzle())
800 rv
= rv
->as_swizzle()->val
;
806 return last
->array_index
;
812 * Validates that a value can be assigned to a location with a specified type
814 * Validates that \c rhs can be assigned to some location. If the types are
815 * not an exact match but an automatic conversion is possible, \c rhs will be
819 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
820 * Otherwise the actual RHS to be assigned will be returned. This may be
821 * \c rhs, or it may be \c rhs after some type conversion.
824 * In addition to being used for assignments, this function is used to
825 * type-check return values.
828 validate_assignment(struct _mesa_glsl_parse_state
*state
,
829 YYLTYPE loc
, ir_rvalue
*lhs
,
830 ir_rvalue
*rhs
, bool is_initializer
)
832 /* If there is already some error in the RHS, just return it. Anything
833 * else will lead to an avalanche of error message back to the user.
835 if (rhs
->type
->is_error())
838 /* In the Tessellation Control Shader:
839 * If a per-vertex output variable is used as an l-value, it is an error
840 * if the expression indicating the vertex number is not the identifier
843 if (state
->stage
== MESA_SHADER_TESS_CTRL
&& !lhs
->type
->is_error()) {
844 ir_variable
*var
= lhs
->variable_referenced();
845 if (var
&& var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
846 ir_rvalue
*index
= find_innermost_array_index(lhs
);
847 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
848 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
849 _mesa_glsl_error(&loc
, state
,
850 "Tessellation control shader outputs can only "
851 "be indexed by gl_InvocationID");
857 /* If the types are identical, the assignment can trivially proceed.
859 if (rhs
->type
== lhs
->type
)
862 /* If the array element types are the same and the LHS is unsized,
863 * the assignment is okay for initializers embedded in variable
866 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
867 * is handled by ir_dereference::is_lvalue.
869 const glsl_type
*lhs_t
= lhs
->type
;
870 const glsl_type
*rhs_t
= rhs
->type
;
871 bool unsized_array
= false;
872 while(lhs_t
->is_array()) {
874 break; /* the rest of the inner arrays match so break out early */
875 if (!rhs_t
->is_array()) {
876 unsized_array
= false;
877 break; /* number of dimensions mismatch */
879 if (lhs_t
->length
== rhs_t
->length
) {
880 lhs_t
= lhs_t
->fields
.array
;
881 rhs_t
= rhs_t
->fields
.array
;
883 } else if (lhs_t
->is_unsized_array()) {
884 unsized_array
= true;
886 unsized_array
= false;
887 break; /* sized array mismatch */
889 lhs_t
= lhs_t
->fields
.array
;
890 rhs_t
= rhs_t
->fields
.array
;
893 if (is_initializer
) {
896 _mesa_glsl_error(&loc
, state
,
897 "implicitly sized arrays cannot be assigned");
902 /* Check for implicit conversion in GLSL 1.20 */
903 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
904 if (rhs
->type
== lhs
->type
)
908 _mesa_glsl_error(&loc
, state
,
909 "%s of type %s cannot be assigned to "
910 "variable of type %s",
911 is_initializer
? "initializer" : "value",
912 rhs
->type
->name
, lhs
->type
->name
);
918 mark_whole_array_access(ir_rvalue
*access
)
920 ir_dereference_variable
*deref
= access
->as_dereference_variable();
922 if (deref
&& deref
->var
) {
923 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
928 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
929 const char *non_lvalue_description
,
930 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
931 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
936 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
938 ir_variable
*lhs_var
= lhs
->variable_referenced();
940 lhs_var
->data
.assigned
= true;
942 if (!error_emitted
) {
943 if (non_lvalue_description
!= NULL
) {
944 _mesa_glsl_error(&lhs_loc
, state
,
946 non_lvalue_description
);
947 error_emitted
= true;
948 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
949 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
950 lhs_var
->data
.image_read_only
))) {
951 /* We can have image_read_only set on both images and buffer variables,
952 * but in the former there is a distinction between assignments to
953 * the variable itself (read_only) and to the memory they point to
954 * (image_read_only), while in the case of buffer variables there is
955 * no such distinction, that is why this check here is limited to
956 * buffer variables alone.
958 _mesa_glsl_error(&lhs_loc
, state
,
959 "assignment to read-only variable '%s'",
961 error_emitted
= true;
962 } else if (lhs
->type
->is_array() &&
963 !state
->check_version(120, 300, &lhs_loc
,
964 "whole array assignment forbidden")) {
965 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
967 * "Other binary or unary expressions, non-dereferenced
968 * arrays, function names, swizzles with repeated fields,
969 * and constants cannot be l-values."
971 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
973 error_emitted
= true;
974 } else if (!lhs
->is_lvalue()) {
975 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
976 error_emitted
= true;
981 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
982 if (new_rhs
!= NULL
) {
985 /* If the LHS array was not declared with a size, it takes it size from
986 * the RHS. If the LHS is an l-value and a whole array, it must be a
987 * dereference of a variable. Any other case would require that the LHS
988 * is either not an l-value or not a whole array.
990 if (lhs
->type
->is_unsized_array()) {
991 ir_dereference
*const d
= lhs
->as_dereference();
995 ir_variable
*const var
= d
->variable_referenced();
999 if (var
->data
.max_array_access
>= rhs
->type
->array_size()) {
1000 /* FINISHME: This should actually log the location of the RHS. */
1001 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
1003 var
->data
.max_array_access
);
1006 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
1007 rhs
->type
->array_size());
1008 d
->type
= var
->type
;
1010 if (lhs
->type
->is_array()) {
1011 mark_whole_array_access(rhs
);
1012 mark_whole_array_access(lhs
);
1016 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
1017 * but not post_inc) need the converted assigned value as an rvalue
1018 * to handle things like:
1024 if (!error_emitted
) {
1025 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1027 instructions
->push_tail(var
);
1028 instructions
->push_tail(assign(var
, rhs
));
1030 ir_dereference_variable
*deref_var
=
1031 new(ctx
) ir_dereference_variable(var
);
1032 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1033 rvalue
= new(ctx
) ir_dereference_variable(var
);
1035 rvalue
= ir_rvalue::error_value(ctx
);
1037 *out_rvalue
= rvalue
;
1040 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1044 return error_emitted
;
1048 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1050 void *ctx
= ralloc_parent(lvalue
);
1053 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1055 instructions
->push_tail(var
);
1057 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1060 return new(ctx
) ir_dereference_variable(var
);
1065 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1067 (void) instructions
;
1074 ast_node::has_sequence_subexpression() const
1080 ast_node::set_is_lhs(bool /* new_value */)
1085 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1086 struct _mesa_glsl_parse_state
*state
)
1088 (void)hir(instructions
, state
);
1092 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1093 struct _mesa_glsl_parse_state
*state
)
1095 (void)hir(instructions
, state
);
1099 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1102 ir_rvalue
*cmp
= NULL
;
1104 if (operation
== ir_binop_all_equal
)
1105 join_op
= ir_binop_logic_and
;
1107 join_op
= ir_binop_logic_or
;
1109 switch (op0
->type
->base_type
) {
1110 case GLSL_TYPE_FLOAT
:
1111 case GLSL_TYPE_UINT
:
1113 case GLSL_TYPE_BOOL
:
1114 case GLSL_TYPE_DOUBLE
:
1115 case GLSL_TYPE_UINT64
:
1116 case GLSL_TYPE_INT64
:
1117 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1119 case GLSL_TYPE_ARRAY
: {
1120 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1121 ir_rvalue
*e0
, *e1
, *result
;
1123 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1124 new(mem_ctx
) ir_constant(i
));
1125 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1126 new(mem_ctx
) ir_constant(i
));
1127 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1130 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1136 mark_whole_array_access(op0
);
1137 mark_whole_array_access(op1
);
1141 case GLSL_TYPE_STRUCT
: {
1142 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1143 ir_rvalue
*e0
, *e1
, *result
;
1144 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1146 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1148 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1150 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1153 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1161 case GLSL_TYPE_ERROR
:
1162 case GLSL_TYPE_VOID
:
1163 case GLSL_TYPE_SAMPLER
:
1164 case GLSL_TYPE_IMAGE
:
1165 case GLSL_TYPE_INTERFACE
:
1166 case GLSL_TYPE_ATOMIC_UINT
:
1167 case GLSL_TYPE_SUBROUTINE
:
1168 case GLSL_TYPE_FUNCTION
:
1169 /* I assume a comparison of a struct containing a sampler just
1170 * ignores the sampler present in the type.
1176 cmp
= new(mem_ctx
) ir_constant(true);
1181 /* For logical operations, we want to ensure that the operands are
1182 * scalar booleans. If it isn't, emit an error and return a constant
1183 * boolean to avoid triggering cascading error messages.
1186 get_scalar_boolean_operand(exec_list
*instructions
,
1187 struct _mesa_glsl_parse_state
*state
,
1188 ast_expression
*parent_expr
,
1190 const char *operand_name
,
1191 bool *error_emitted
)
1193 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1195 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1197 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1200 if (!*error_emitted
) {
1201 YYLTYPE loc
= expr
->get_location();
1202 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1204 parent_expr
->operator_string(parent_expr
->oper
));
1205 *error_emitted
= true;
1208 return new(ctx
) ir_constant(true);
1212 * If name refers to a builtin array whose maximum allowed size is less than
1213 * size, report an error and return true. Otherwise return false.
1216 check_builtin_array_max_size(const char *name
, unsigned size
,
1217 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1219 if ((strcmp("gl_TexCoord", name
) == 0)
1220 && (size
> state
->Const
.MaxTextureCoords
)) {
1221 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1223 * "The size [of gl_TexCoord] can be at most
1224 * gl_MaxTextureCoords."
1226 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1227 "be larger than gl_MaxTextureCoords (%u)",
1228 state
->Const
.MaxTextureCoords
);
1229 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1230 state
->clip_dist_size
= size
;
1231 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1232 /* From section 7.1 (Vertex Shader Special Variables) of the
1235 * "The gl_ClipDistance array is predeclared as unsized and
1236 * must be sized by the shader either redeclaring it with a
1237 * size or indexing it only with integral constant
1238 * expressions. ... The size can be at most
1239 * gl_MaxClipDistances."
1241 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1242 "be larger than gl_MaxClipDistances (%u)",
1243 state
->Const
.MaxClipPlanes
);
1245 } else if (strcmp("gl_CullDistance", name
) == 0) {
1246 state
->cull_dist_size
= size
;
1247 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1248 /* From the ARB_cull_distance spec:
1250 * "The gl_CullDistance array is predeclared as unsized and
1251 * must be sized by the shader either redeclaring it with
1252 * a size or indexing it only with integral constant
1253 * expressions. The size determines the number and set of
1254 * enabled cull distances and can be at most
1255 * gl_MaxCullDistances."
1257 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1258 "be larger than gl_MaxCullDistances (%u)",
1259 state
->Const
.MaxClipPlanes
);
1265 * Create the constant 1, of a which is appropriate for incrementing and
1266 * decrementing values of the given GLSL type. For example, if type is vec4,
1267 * this creates a constant value of 1.0 having type float.
1269 * If the given type is invalid for increment and decrement operators, return
1270 * a floating point 1--the error will be detected later.
1273 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1275 switch (type
->base_type
) {
1276 case GLSL_TYPE_UINT
:
1277 return new(ctx
) ir_constant((unsigned) 1);
1279 return new(ctx
) ir_constant(1);
1280 case GLSL_TYPE_UINT64
:
1281 return new(ctx
) ir_constant((uint64_t) 1);
1282 case GLSL_TYPE_INT64
:
1283 return new(ctx
) ir_constant((int64_t) 1);
1285 case GLSL_TYPE_FLOAT
:
1286 return new(ctx
) ir_constant(1.0f
);
1291 ast_expression::hir(exec_list
*instructions
,
1292 struct _mesa_glsl_parse_state
*state
)
1294 return do_hir(instructions
, state
, true);
1298 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1299 struct _mesa_glsl_parse_state
*state
)
1301 do_hir(instructions
, state
, false);
1305 ast_expression::set_is_lhs(bool new_value
)
1307 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1308 * if we lack an identifier we can just skip it.
1310 if (this->primary_expression
.identifier
== NULL
)
1313 this->is_lhs
= new_value
;
1315 /* We need to go through the subexpressions tree to cover cases like
1316 * ast_field_selection
1318 if (this->subexpressions
[0] != NULL
)
1319 this->subexpressions
[0]->set_is_lhs(new_value
);
1323 ast_expression::do_hir(exec_list
*instructions
,
1324 struct _mesa_glsl_parse_state
*state
,
1328 static const int operations
[AST_NUM_OPERATORS
] = {
1329 -1, /* ast_assign doesn't convert to ir_expression. */
1330 -1, /* ast_plus doesn't convert to ir_expression. */
1344 ir_binop_any_nequal
,
1354 /* Note: The following block of expression types actually convert
1355 * to multiple IR instructions.
1357 ir_binop_mul
, /* ast_mul_assign */
1358 ir_binop_div
, /* ast_div_assign */
1359 ir_binop_mod
, /* ast_mod_assign */
1360 ir_binop_add
, /* ast_add_assign */
1361 ir_binop_sub
, /* ast_sub_assign */
1362 ir_binop_lshift
, /* ast_ls_assign */
1363 ir_binop_rshift
, /* ast_rs_assign */
1364 ir_binop_bit_and
, /* ast_and_assign */
1365 ir_binop_bit_xor
, /* ast_xor_assign */
1366 ir_binop_bit_or
, /* ast_or_assign */
1368 -1, /* ast_conditional doesn't convert to ir_expression. */
1369 ir_binop_add
, /* ast_pre_inc. */
1370 ir_binop_sub
, /* ast_pre_dec. */
1371 ir_binop_add
, /* ast_post_inc. */
1372 ir_binop_sub
, /* ast_post_dec. */
1373 -1, /* ast_field_selection doesn't conv to ir_expression. */
1374 -1, /* ast_array_index doesn't convert to ir_expression. */
1375 -1, /* ast_function_call doesn't conv to ir_expression. */
1376 -1, /* ast_identifier doesn't convert to ir_expression. */
1377 -1, /* ast_int_constant doesn't convert to ir_expression. */
1378 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1379 -1, /* ast_float_constant doesn't conv to ir_expression. */
1380 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1381 -1, /* ast_sequence doesn't convert to ir_expression. */
1382 -1, /* ast_aggregate shouldn't ever even get here. */
1384 ir_rvalue
*result
= NULL
;
1386 const struct glsl_type
*type
, *orig_type
;
1387 bool error_emitted
= false;
1390 loc
= this->get_location();
1392 switch (this->oper
) {
1394 assert(!"ast_aggregate: Should never get here.");
1398 this->subexpressions
[0]->set_is_lhs(true);
1399 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1400 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1403 do_assignment(instructions
, state
,
1404 this->subexpressions
[0]->non_lvalue_description
,
1405 op
[0], op
[1], &result
, needs_rvalue
, false,
1406 this->subexpressions
[0]->get_location());
1411 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1413 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1415 error_emitted
= type
->is_error();
1421 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1423 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1425 error_emitted
= type
->is_error();
1427 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1435 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1436 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1438 type
= arithmetic_result_type(op
[0], op
[1],
1439 (this->oper
== ast_mul
),
1441 error_emitted
= type
->is_error();
1443 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1448 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1449 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1451 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1453 assert(operations
[this->oper
] == ir_binop_mod
);
1455 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1457 error_emitted
= type
->is_error();
1462 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1463 error_emitted
= true;
1466 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1467 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1468 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1470 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1472 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1479 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1480 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1482 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1484 /* The relational operators must either generate an error or result
1485 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1487 assert(type
->is_error()
1488 || (type
->is_boolean() && type
->is_scalar()));
1490 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1492 error_emitted
= type
->is_error();
1497 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1498 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1500 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1502 * "The equality operators equal (==), and not equal (!=)
1503 * operate on all types. They result in a scalar Boolean. If
1504 * the operand types do not match, then there must be a
1505 * conversion from Section 4.1.10 "Implicit Conversions"
1506 * applied to one operand that can make them match, in which
1507 * case this conversion is done."
1510 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1511 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1512 "no operation `%1$s' exists that takes a left-hand "
1513 "operand of type 'void' or a right operand of type "
1514 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1515 error_emitted
= true;
1516 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1517 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1518 || (op
[0]->type
!= op
[1]->type
)) {
1519 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1520 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1521 error_emitted
= true;
1522 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1523 !state
->check_version(120, 300, &loc
,
1524 "array comparisons forbidden")) {
1525 error_emitted
= true;
1526 } else if ((op
[0]->type
->contains_subroutine() ||
1527 op
[1]->type
->contains_subroutine())) {
1528 _mesa_glsl_error(&loc
, state
, "subroutine comparisons forbidden");
1529 error_emitted
= true;
1530 } else if ((op
[0]->type
->contains_opaque() ||
1531 op
[1]->type
->contains_opaque())) {
1532 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1533 error_emitted
= true;
1536 if (error_emitted
) {
1537 result
= new(ctx
) ir_constant(false);
1539 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1540 assert(result
->type
== glsl_type::bool_type
);
1547 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1548 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1549 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1550 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1552 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1556 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1558 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1559 error_emitted
= true;
1562 if (!op
[0]->type
->is_integer_32_64()) {
1563 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1564 error_emitted
= true;
1567 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1568 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1571 case ast_logic_and
: {
1572 exec_list rhs_instructions
;
1573 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1574 "LHS", &error_emitted
);
1575 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1576 "RHS", &error_emitted
);
1578 if (rhs_instructions
.is_empty()) {
1579 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1580 type
= result
->type
;
1582 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1585 instructions
->push_tail(tmp
);
1587 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1588 instructions
->push_tail(stmt
);
1590 stmt
->then_instructions
.append_list(&rhs_instructions
);
1591 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1592 ir_assignment
*const then_assign
=
1593 new(ctx
) ir_assignment(then_deref
, op
[1]);
1594 stmt
->then_instructions
.push_tail(then_assign
);
1596 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1597 ir_assignment
*const else_assign
=
1598 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1599 stmt
->else_instructions
.push_tail(else_assign
);
1601 result
= new(ctx
) ir_dereference_variable(tmp
);
1607 case ast_logic_or
: {
1608 exec_list rhs_instructions
;
1609 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1610 "LHS", &error_emitted
);
1611 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1612 "RHS", &error_emitted
);
1614 if (rhs_instructions
.is_empty()) {
1615 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1616 type
= result
->type
;
1618 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1621 instructions
->push_tail(tmp
);
1623 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1624 instructions
->push_tail(stmt
);
1626 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1627 ir_assignment
*const then_assign
=
1628 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1629 stmt
->then_instructions
.push_tail(then_assign
);
1631 stmt
->else_instructions
.append_list(&rhs_instructions
);
1632 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1633 ir_assignment
*const else_assign
=
1634 new(ctx
) ir_assignment(else_deref
, op
[1]);
1635 stmt
->else_instructions
.push_tail(else_assign
);
1637 result
= new(ctx
) ir_dereference_variable(tmp
);
1644 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1646 * "The logical binary operators and (&&), or ( | | ), and
1647 * exclusive or (^^). They operate only on two Boolean
1648 * expressions and result in a Boolean expression."
1650 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1652 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1655 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1660 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1661 "operand", &error_emitted
);
1663 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1667 case ast_mul_assign
:
1668 case ast_div_assign
:
1669 case ast_add_assign
:
1670 case ast_sub_assign
: {
1671 this->subexpressions
[0]->set_is_lhs(true);
1672 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1673 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1675 orig_type
= op
[0]->type
;
1676 type
= arithmetic_result_type(op
[0], op
[1],
1677 (this->oper
== ast_mul_assign
),
1680 if (type
!= orig_type
) {
1681 _mesa_glsl_error(& loc
, state
,
1682 "could not implicitly convert "
1683 "%s to %s", type
->name
, orig_type
->name
);
1684 type
= glsl_type::error_type
;
1687 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1691 do_assignment(instructions
, state
,
1692 this->subexpressions
[0]->non_lvalue_description
,
1693 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1694 &result
, needs_rvalue
, false,
1695 this->subexpressions
[0]->get_location());
1697 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1698 * explicitly test for this because none of the binary expression
1699 * operators allow array operands either.
1705 case ast_mod_assign
: {
1706 this->subexpressions
[0]->set_is_lhs(true);
1707 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1708 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1710 orig_type
= op
[0]->type
;
1711 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1713 if (type
!= orig_type
) {
1714 _mesa_glsl_error(& loc
, state
,
1715 "could not implicitly convert "
1716 "%s to %s", type
->name
, orig_type
->name
);
1717 type
= glsl_type::error_type
;
1720 assert(operations
[this->oper
] == ir_binop_mod
);
1722 ir_rvalue
*temp_rhs
;
1723 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1727 do_assignment(instructions
, state
,
1728 this->subexpressions
[0]->non_lvalue_description
,
1729 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1730 &result
, needs_rvalue
, false,
1731 this->subexpressions
[0]->get_location());
1736 case ast_rs_assign
: {
1737 this->subexpressions
[0]->set_is_lhs(true);
1738 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1739 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1740 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1742 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1743 type
, op
[0], op
[1]);
1745 do_assignment(instructions
, state
,
1746 this->subexpressions
[0]->non_lvalue_description
,
1747 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1748 &result
, needs_rvalue
, false,
1749 this->subexpressions
[0]->get_location());
1753 case ast_and_assign
:
1754 case ast_xor_assign
:
1755 case ast_or_assign
: {
1756 this->subexpressions
[0]->set_is_lhs(true);
1757 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1758 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1760 orig_type
= op
[0]->type
;
1761 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1763 if (type
!= orig_type
) {
1764 _mesa_glsl_error(& loc
, state
,
1765 "could not implicitly convert "
1766 "%s to %s", type
->name
, orig_type
->name
);
1767 type
= glsl_type::error_type
;
1770 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1771 type
, op
[0], op
[1]);
1773 do_assignment(instructions
, state
,
1774 this->subexpressions
[0]->non_lvalue_description
,
1775 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1776 &result
, needs_rvalue
, false,
1777 this->subexpressions
[0]->get_location());
1781 case ast_conditional
: {
1782 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1784 * "The ternary selection operator (?:). It operates on three
1785 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1786 * first expression, which must result in a scalar Boolean."
1788 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1789 "condition", &error_emitted
);
1791 /* The :? operator is implemented by generating an anonymous temporary
1792 * followed by an if-statement. The last instruction in each branch of
1793 * the if-statement assigns a value to the anonymous temporary. This
1794 * temporary is the r-value of the expression.
1796 exec_list then_instructions
;
1797 exec_list else_instructions
;
1799 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1800 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1802 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1804 * "The second and third expressions can be any type, as
1805 * long their types match, or there is a conversion in
1806 * Section 4.1.10 "Implicit Conversions" that can be applied
1807 * to one of the expressions to make their types match. This
1808 * resulting matching type is the type of the entire
1811 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1812 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1813 || (op
[1]->type
!= op
[2]->type
)) {
1814 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1816 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1817 "operator must have matching types");
1818 error_emitted
= true;
1819 type
= glsl_type::error_type
;
1824 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1826 * "The second and third expressions must be the same type, but can
1827 * be of any type other than an array."
1829 if (type
->is_array() &&
1830 !state
->check_version(120, 300, &loc
,
1831 "second and third operands of ?: operator "
1832 "cannot be arrays")) {
1833 error_emitted
= true;
1836 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1838 * "Except for array indexing, structure member selection, and
1839 * parentheses, opaque variables are not allowed to be operands in
1840 * expressions; such use results in a compile-time error."
1842 if (type
->contains_opaque()) {
1843 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1844 "of the ?: operator");
1845 error_emitted
= true;
1848 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1850 if (then_instructions
.is_empty()
1851 && else_instructions
.is_empty()
1852 && cond_val
!= NULL
) {
1853 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1855 /* The copy to conditional_tmp reads the whole array. */
1856 if (type
->is_array()) {
1857 mark_whole_array_access(op
[1]);
1858 mark_whole_array_access(op
[2]);
1861 ir_variable
*const tmp
=
1862 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1863 instructions
->push_tail(tmp
);
1865 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1866 instructions
->push_tail(stmt
);
1868 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1869 ir_dereference
*const then_deref
=
1870 new(ctx
) ir_dereference_variable(tmp
);
1871 ir_assignment
*const then_assign
=
1872 new(ctx
) ir_assignment(then_deref
, op
[1]);
1873 stmt
->then_instructions
.push_tail(then_assign
);
1875 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1876 ir_dereference
*const else_deref
=
1877 new(ctx
) ir_dereference_variable(tmp
);
1878 ir_assignment
*const else_assign
=
1879 new(ctx
) ir_assignment(else_deref
, op
[2]);
1880 stmt
->else_instructions
.push_tail(else_assign
);
1882 result
= new(ctx
) ir_dereference_variable(tmp
);
1889 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1890 ? "pre-increment operation" : "pre-decrement operation";
1892 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1893 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1895 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1897 ir_rvalue
*temp_rhs
;
1898 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1902 do_assignment(instructions
, state
,
1903 this->subexpressions
[0]->non_lvalue_description
,
1904 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1905 &result
, needs_rvalue
, false,
1906 this->subexpressions
[0]->get_location());
1911 case ast_post_dec
: {
1912 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1913 ? "post-increment operation" : "post-decrement operation";
1914 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1915 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1917 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1919 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1921 ir_rvalue
*temp_rhs
;
1922 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1925 /* Get a temporary of a copy of the lvalue before it's modified.
1926 * This may get thrown away later.
1928 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1930 ir_rvalue
*junk_rvalue
;
1932 do_assignment(instructions
, state
,
1933 this->subexpressions
[0]->non_lvalue_description
,
1934 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1935 &junk_rvalue
, false, false,
1936 this->subexpressions
[0]->get_location());
1941 case ast_field_selection
:
1942 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1945 case ast_array_index
: {
1946 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1948 /* Getting if an array is being used uninitialized is beyond what we get
1949 * from ir_value.data.assigned. Setting is_lhs as true would force to
1950 * not raise a uninitialized warning when using an array
1952 subexpressions
[0]->set_is_lhs(true);
1953 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1954 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1956 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1959 if (result
->type
->is_error())
1960 error_emitted
= true;
1965 case ast_unsized_array_dim
:
1966 assert(!"ast_unsized_array_dim: Should never get here.");
1969 case ast_function_call
:
1970 /* Should *NEVER* get here. ast_function_call should always be handled
1971 * by ast_function_expression::hir.
1976 case ast_identifier
: {
1977 /* ast_identifier can appear several places in a full abstract syntax
1978 * tree. This particular use must be at location specified in the grammar
1979 * as 'variable_identifier'.
1982 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1985 /* the identifier might be a subroutine name */
1987 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
1988 var
= state
->symbols
->get_variable(sub_name
);
1989 ralloc_free(sub_name
);
1993 var
->data
.used
= true;
1994 result
= new(ctx
) ir_dereference_variable(var
);
1996 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
1998 && result
->variable_referenced()->data
.assigned
!= true
1999 && !is_gl_identifier(var
->name
)) {
2000 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
2001 this->primary_expression
.identifier
);
2004 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
2005 this->primary_expression
.identifier
);
2007 result
= ir_rvalue::error_value(ctx
);
2008 error_emitted
= true;
2013 case ast_int_constant
:
2014 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
2017 case ast_uint_constant
:
2018 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
2021 case ast_float_constant
:
2022 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
2025 case ast_bool_constant
:
2026 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
2029 case ast_double_constant
:
2030 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
2033 case ast_uint64_constant
:
2034 result
= new(ctx
) ir_constant(this->primary_expression
.uint64_constant
);
2037 case ast_int64_constant
:
2038 result
= new(ctx
) ir_constant(this->primary_expression
.int64_constant
);
2041 case ast_sequence
: {
2042 /* It should not be possible to generate a sequence in the AST without
2043 * any expressions in it.
2045 assert(!this->expressions
.is_empty());
2047 /* The r-value of a sequence is the last expression in the sequence. If
2048 * the other expressions in the sequence do not have side-effects (and
2049 * therefore add instructions to the instruction list), they get dropped
2052 exec_node
*previous_tail
= NULL
;
2053 YYLTYPE previous_operand_loc
= loc
;
2055 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
2056 /* If one of the operands of comma operator does not generate any
2057 * code, we want to emit a warning. At each pass through the loop
2058 * previous_tail will point to the last instruction in the stream
2059 * *before* processing the previous operand. Naturally,
2060 * instructions->get_tail_raw() will point to the last instruction in
2061 * the stream *after* processing the previous operand. If the two
2062 * pointers match, then the previous operand had no effect.
2064 * The warning behavior here differs slightly from GCC. GCC will
2065 * only emit a warning if none of the left-hand operands have an
2066 * effect. However, it will emit a warning for each. I believe that
2067 * there are some cases in C (especially with GCC extensions) where
2068 * it is useful to have an intermediate step in a sequence have no
2069 * effect, but I don't think these cases exist in GLSL. Either way,
2070 * it would be a giant hassle to replicate that behavior.
2072 if (previous_tail
== instructions
->get_tail_raw()) {
2073 _mesa_glsl_warning(&previous_operand_loc
, state
,
2074 "left-hand operand of comma expression has "
2078 /* The tail is directly accessed instead of using the get_tail()
2079 * method for performance reasons. get_tail() has extra code to
2080 * return NULL when the list is empty. We don't care about that
2081 * here, so using get_tail_raw() is fine.
2083 previous_tail
= instructions
->get_tail_raw();
2084 previous_operand_loc
= ast
->get_location();
2086 result
= ast
->hir(instructions
, state
);
2089 /* Any errors should have already been emitted in the loop above.
2091 error_emitted
= true;
2095 type
= NULL
; /* use result->type, not type. */
2096 assert(result
!= NULL
|| !needs_rvalue
);
2098 if (result
&& result
->type
->is_error() && !error_emitted
)
2099 _mesa_glsl_error(& loc
, state
, "type mismatch");
2105 ast_expression::has_sequence_subexpression() const
2107 switch (this->oper
) {
2116 return this->subexpressions
[0]->has_sequence_subexpression();
2138 case ast_array_index
:
2139 case ast_mul_assign
:
2140 case ast_div_assign
:
2141 case ast_add_assign
:
2142 case ast_sub_assign
:
2143 case ast_mod_assign
:
2146 case ast_and_assign
:
2147 case ast_xor_assign
:
2149 return this->subexpressions
[0]->has_sequence_subexpression() ||
2150 this->subexpressions
[1]->has_sequence_subexpression();
2152 case ast_conditional
:
2153 return this->subexpressions
[0]->has_sequence_subexpression() ||
2154 this->subexpressions
[1]->has_sequence_subexpression() ||
2155 this->subexpressions
[2]->has_sequence_subexpression();
2160 case ast_field_selection
:
2161 case ast_identifier
:
2162 case ast_int_constant
:
2163 case ast_uint_constant
:
2164 case ast_float_constant
:
2165 case ast_bool_constant
:
2166 case ast_double_constant
:
2167 case ast_int64_constant
:
2168 case ast_uint64_constant
:
2174 case ast_function_call
:
2175 unreachable("should be handled by ast_function_expression::hir");
2177 case ast_unsized_array_dim
:
2178 unreachable("ast_unsized_array_dim: Should never get here.");
2185 ast_expression_statement::hir(exec_list
*instructions
,
2186 struct _mesa_glsl_parse_state
*state
)
2188 /* It is possible to have expression statements that don't have an
2189 * expression. This is the solitary semicolon:
2191 * for (i = 0; i < 5; i++)
2194 * In this case the expression will be NULL. Test for NULL and don't do
2195 * anything in that case.
2197 if (expression
!= NULL
)
2198 expression
->hir_no_rvalue(instructions
, state
);
2200 /* Statements do not have r-values.
2207 ast_compound_statement::hir(exec_list
*instructions
,
2208 struct _mesa_glsl_parse_state
*state
)
2211 state
->symbols
->push_scope();
2213 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2214 ast
->hir(instructions
, state
);
2217 state
->symbols
->pop_scope();
2219 /* Compound statements do not have r-values.
2225 * Evaluate the given exec_node (which should be an ast_node representing
2226 * a single array dimension) and return its integer value.
2229 process_array_size(exec_node
*node
,
2230 struct _mesa_glsl_parse_state
*state
)
2232 exec_list dummy_instructions
;
2234 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2237 * Dimensions other than the outermost dimension can by unsized if they
2238 * are immediately sized by a constructor or initializer.
2240 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2243 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2244 YYLTYPE loc
= array_size
->get_location();
2247 _mesa_glsl_error(& loc
, state
,
2248 "array size could not be resolved");
2252 if (!ir
->type
->is_integer()) {
2253 _mesa_glsl_error(& loc
, state
,
2254 "array size must be integer type");
2258 if (!ir
->type
->is_scalar()) {
2259 _mesa_glsl_error(& loc
, state
,
2260 "array size must be scalar type");
2264 ir_constant
*const size
= ir
->constant_expression_value();
2266 (state
->is_version(120, 300) &&
2267 array_size
->has_sequence_subexpression())) {
2268 _mesa_glsl_error(& loc
, state
, "array size must be a "
2269 "constant valued expression");
2273 if (size
->value
.i
[0] <= 0) {
2274 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2278 assert(size
->type
== ir
->type
);
2280 /* If the array size is const (and we've verified that
2281 * it is) then no instructions should have been emitted
2282 * when we converted it to HIR. If they were emitted,
2283 * then either the array size isn't const after all, or
2284 * we are emitting unnecessary instructions.
2286 assert(dummy_instructions
.is_empty());
2288 return size
->value
.u
[0];
2291 static const glsl_type
*
2292 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2293 ast_array_specifier
*array_specifier
,
2294 struct _mesa_glsl_parse_state
*state
)
2296 const glsl_type
*array_type
= base
;
2298 if (array_specifier
!= NULL
) {
2299 if (base
->is_array()) {
2301 /* From page 19 (page 25) of the GLSL 1.20 spec:
2303 * "Only one-dimensional arrays may be declared."
2305 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2306 return glsl_type::error_type
;
2310 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2311 !node
->is_head_sentinel(); node
= node
->prev
) {
2312 unsigned array_size
= process_array_size(node
, state
);
2313 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2321 precision_qualifier_allowed(const glsl_type
*type
)
2323 /* Precision qualifiers apply to floating point, integer and opaque
2326 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2327 * "Any floating point or any integer declaration can have the type
2328 * preceded by one of these precision qualifiers [...] Literal
2329 * constants do not have precision qualifiers. Neither do Boolean
2332 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2335 * "Precision qualifiers are added for code portability with OpenGL
2336 * ES, not for functionality. They have the same syntax as in OpenGL
2339 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2341 * "uniform lowp sampler2D sampler;
2344 * lowp vec4 col = texture2D (sampler, coord);
2345 * // texture2D returns lowp"
2347 * From this, we infer that GLSL 1.30 (and later) should allow precision
2348 * qualifiers on sampler types just like float and integer types.
2350 const glsl_type
*const t
= type
->without_array();
2352 return (t
->is_float() || t
->is_integer() || t
->contains_opaque()) &&
2357 ast_type_specifier::glsl_type(const char **name
,
2358 struct _mesa_glsl_parse_state
*state
) const
2360 const struct glsl_type
*type
;
2362 type
= state
->symbols
->get_type(this->type_name
);
2363 *name
= this->type_name
;
2365 YYLTYPE loc
= this->get_location();
2366 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2372 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2374 * "The precision statement
2376 * precision precision-qualifier type;
2378 * can be used to establish a default precision qualifier. The type field can
2379 * be either int or float or any of the sampler types, (...) If type is float,
2380 * the directive applies to non-precision-qualified floating point type
2381 * (scalar, vector, and matrix) declarations. If type is int, the directive
2382 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2383 * and unsigned) declarations."
2385 * We use the symbol table to keep the values of the default precisions for
2386 * each 'type' in each scope and we use the 'type' string from the precision
2387 * statement as key in the symbol table. When we want to retrieve the default
2388 * precision associated with a given glsl_type we need to know the type string
2389 * associated with it. This is what this function returns.
2392 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2394 switch (type
->base_type
) {
2395 case GLSL_TYPE_FLOAT
:
2397 case GLSL_TYPE_UINT
:
2400 case GLSL_TYPE_ATOMIC_UINT
:
2401 return "atomic_uint";
2402 case GLSL_TYPE_IMAGE
:
2404 case GLSL_TYPE_SAMPLER
: {
2405 const unsigned type_idx
=
2406 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2407 const unsigned offset
= type
->is_sampler() ? 0 : 4;
2408 assert(type_idx
< 4);
2409 switch (type
->sampled_type
) {
2410 case GLSL_TYPE_FLOAT
:
2411 switch (type
->sampler_dimensionality
) {
2412 case GLSL_SAMPLER_DIM_1D
: {
2413 assert(type
->is_sampler());
2414 static const char *const names
[4] = {
2415 "sampler1D", "sampler1DArray",
2416 "sampler1DShadow", "sampler1DArrayShadow"
2418 return names
[type_idx
];
2420 case GLSL_SAMPLER_DIM_2D
: {
2421 static const char *const names
[8] = {
2422 "sampler2D", "sampler2DArray",
2423 "sampler2DShadow", "sampler2DArrayShadow",
2424 "image2D", "image2DArray", NULL
, NULL
2426 return names
[offset
+ type_idx
];
2428 case GLSL_SAMPLER_DIM_3D
: {
2429 static const char *const names
[8] = {
2430 "sampler3D", NULL
, NULL
, NULL
,
2431 "image3D", NULL
, NULL
, NULL
2433 return names
[offset
+ type_idx
];
2435 case GLSL_SAMPLER_DIM_CUBE
: {
2436 static const char *const names
[8] = {
2437 "samplerCube", "samplerCubeArray",
2438 "samplerCubeShadow", "samplerCubeArrayShadow",
2439 "imageCube", NULL
, NULL
, NULL
2441 return names
[offset
+ type_idx
];
2443 case GLSL_SAMPLER_DIM_MS
: {
2444 assert(type
->is_sampler());
2445 static const char *const names
[4] = {
2446 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2448 return names
[type_idx
];
2450 case GLSL_SAMPLER_DIM_RECT
: {
2451 assert(type
->is_sampler());
2452 static const char *const names
[4] = {
2453 "samplerRect", NULL
, "samplerRectShadow", NULL
2455 return names
[type_idx
];
2457 case GLSL_SAMPLER_DIM_BUF
: {
2458 static const char *const names
[8] = {
2459 "samplerBuffer", NULL
, NULL
, NULL
,
2460 "imageBuffer", NULL
, NULL
, NULL
2462 return names
[offset
+ type_idx
];
2464 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2465 assert(type
->is_sampler());
2466 static const char *const names
[4] = {
2467 "samplerExternalOES", NULL
, NULL
, NULL
2469 return names
[type_idx
];
2472 unreachable("Unsupported sampler/image dimensionality");
2473 } /* sampler/image float dimensionality */
2476 switch (type
->sampler_dimensionality
) {
2477 case GLSL_SAMPLER_DIM_1D
: {
2478 assert(type
->is_sampler());
2479 static const char *const names
[4] = {
2480 "isampler1D", "isampler1DArray", NULL
, NULL
2482 return names
[type_idx
];
2484 case GLSL_SAMPLER_DIM_2D
: {
2485 static const char *const names
[8] = {
2486 "isampler2D", "isampler2DArray", NULL
, NULL
,
2487 "iimage2D", "iimage2DArray", NULL
, NULL
2489 return names
[offset
+ type_idx
];
2491 case GLSL_SAMPLER_DIM_3D
: {
2492 static const char *const names
[8] = {
2493 "isampler3D", NULL
, NULL
, NULL
,
2494 "iimage3D", NULL
, NULL
, NULL
2496 return names
[offset
+ type_idx
];
2498 case GLSL_SAMPLER_DIM_CUBE
: {
2499 static const char *const names
[8] = {
2500 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2501 "iimageCube", NULL
, NULL
, NULL
2503 return names
[offset
+ type_idx
];
2505 case GLSL_SAMPLER_DIM_MS
: {
2506 assert(type
->is_sampler());
2507 static const char *const names
[4] = {
2508 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2510 return names
[type_idx
];
2512 case GLSL_SAMPLER_DIM_RECT
: {
2513 assert(type
->is_sampler());
2514 static const char *const names
[4] = {
2515 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2517 return names
[type_idx
];
2519 case GLSL_SAMPLER_DIM_BUF
: {
2520 static const char *const names
[8] = {
2521 "isamplerBuffer", NULL
, NULL
, NULL
,
2522 "iimageBuffer", NULL
, NULL
, NULL
2524 return names
[offset
+ type_idx
];
2527 unreachable("Unsupported isampler/iimage dimensionality");
2528 } /* sampler/image int dimensionality */
2530 case GLSL_TYPE_UINT
:
2531 switch (type
->sampler_dimensionality
) {
2532 case GLSL_SAMPLER_DIM_1D
: {
2533 assert(type
->is_sampler());
2534 static const char *const names
[4] = {
2535 "usampler1D", "usampler1DArray", NULL
, NULL
2537 return names
[type_idx
];
2539 case GLSL_SAMPLER_DIM_2D
: {
2540 static const char *const names
[8] = {
2541 "usampler2D", "usampler2DArray", NULL
, NULL
,
2542 "uimage2D", "uimage2DArray", NULL
, NULL
2544 return names
[offset
+ type_idx
];
2546 case GLSL_SAMPLER_DIM_3D
: {
2547 static const char *const names
[8] = {
2548 "usampler3D", NULL
, NULL
, NULL
,
2549 "uimage3D", NULL
, NULL
, NULL
2551 return names
[offset
+ type_idx
];
2553 case GLSL_SAMPLER_DIM_CUBE
: {
2554 static const char *const names
[8] = {
2555 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2556 "uimageCube", NULL
, NULL
, NULL
2558 return names
[offset
+ type_idx
];
2560 case GLSL_SAMPLER_DIM_MS
: {
2561 assert(type
->is_sampler());
2562 static const char *const names
[4] = {
2563 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2565 return names
[type_idx
];
2567 case GLSL_SAMPLER_DIM_RECT
: {
2568 assert(type
->is_sampler());
2569 static const char *const names
[4] = {
2570 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2572 return names
[type_idx
];
2574 case GLSL_SAMPLER_DIM_BUF
: {
2575 static const char *const names
[8] = {
2576 "usamplerBuffer", NULL
, NULL
, NULL
,
2577 "uimageBuffer", NULL
, NULL
, NULL
2579 return names
[offset
+ type_idx
];
2582 unreachable("Unsupported usampler/uimage dimensionality");
2583 } /* sampler/image uint dimensionality */
2586 unreachable("Unsupported sampler/image type");
2587 } /* sampler/image type */
2589 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2592 unreachable("Unsupported type");
2597 select_gles_precision(unsigned qual_precision
,
2598 const glsl_type
*type
,
2599 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2601 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2602 * In GLES we take the precision from the type qualifier if present,
2603 * otherwise, if the type of the variable allows precision qualifiers at
2604 * all, we look for the default precision qualifier for that type in the
2607 assert(state
->es_shader
);
2609 unsigned precision
= GLSL_PRECISION_NONE
;
2610 if (qual_precision
) {
2611 precision
= qual_precision
;
2612 } else if (precision_qualifier_allowed(type
)) {
2613 const char *type_name
=
2614 get_type_name_for_precision_qualifier(type
->without_array());
2615 assert(type_name
!= NULL
);
2618 state
->symbols
->get_default_precision_qualifier(type_name
);
2619 if (precision
== ast_precision_none
) {
2620 _mesa_glsl_error(loc
, state
,
2621 "No precision specified in this scope for type `%s'",
2627 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
2629 * "The default precision of all atomic types is highp. It is an error to
2630 * declare an atomic type with a different precision or to specify the
2631 * default precision for an atomic type to be lowp or mediump."
2633 if (type
->is_atomic_uint() && precision
!= ast_precision_high
) {
2634 _mesa_glsl_error(loc
, state
,
2635 "atomic_uint can only have highp precision qualifier");
2642 ast_fully_specified_type::glsl_type(const char **name
,
2643 struct _mesa_glsl_parse_state
*state
) const
2645 return this->specifier
->glsl_type(name
, state
);
2649 * Determine whether a toplevel variable declaration declares a varying. This
2650 * function operates by examining the variable's mode and the shader target,
2651 * so it correctly identifies linkage variables regardless of whether they are
2652 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2654 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2655 * this function will produce undefined results.
2658 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2661 case MESA_SHADER_VERTEX
:
2662 return var
->data
.mode
== ir_var_shader_out
;
2663 case MESA_SHADER_FRAGMENT
:
2664 return var
->data
.mode
== ir_var_shader_in
;
2666 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2671 is_allowed_invariant(ir_variable
*var
, struct _mesa_glsl_parse_state
*state
)
2673 if (is_varying_var(var
, state
->stage
))
2676 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec:
2677 * "Only variables output from a vertex shader can be candidates
2680 if (!state
->is_version(130, 0))
2684 * Later specs remove this language - so allowed invariant
2685 * on fragment shader outputs as well.
2687 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
2688 var
->data
.mode
== ir_var_shader_out
)
2694 * Matrix layout qualifiers are only allowed on certain types
2697 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2699 const glsl_type
*type
,
2702 if (var
&& !var
->is_in_buffer_block()) {
2703 /* Layout qualifiers may only apply to interface blocks and fields in
2706 _mesa_glsl_error(loc
, state
,
2707 "uniform block layout qualifiers row_major and "
2708 "column_major may not be applied to variables "
2709 "outside of uniform blocks");
2710 } else if (!type
->without_array()->is_matrix()) {
2711 /* The OpenGL ES 3.0 conformance tests did not originally allow
2712 * matrix layout qualifiers on non-matrices. However, the OpenGL
2713 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2714 * amended to specifically allow these layouts on all types. Emit
2715 * a warning so that people know their code may not be portable.
2717 _mesa_glsl_warning(loc
, state
,
2718 "uniform block layout qualifiers row_major and "
2719 "column_major applied to non-matrix types may "
2720 "be rejected by older compilers");
2725 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2726 struct _mesa_glsl_parse_state
*state
,
2727 unsigned xfb_buffer
) {
2728 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2729 _mesa_glsl_error(loc
, state
,
2730 "invalid xfb_buffer specified %d is larger than "
2731 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2733 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2740 /* From the ARB_enhanced_layouts spec:
2742 * "Variables and block members qualified with *xfb_offset* can be
2743 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2744 * The offset must be a multiple of the size of the first component of
2745 * the first qualified variable or block member, or a compile-time error
2746 * results. Further, if applied to an aggregate containing a double,
2747 * the offset must also be a multiple of 8, and the space taken in the
2748 * buffer will be a multiple of 8.
2751 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2752 struct _mesa_glsl_parse_state
*state
,
2753 int xfb_offset
, const glsl_type
*type
,
2754 unsigned component_size
) {
2755 const glsl_type
*t_without_array
= type
->without_array();
2757 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2758 _mesa_glsl_error(loc
, state
,
2759 "xfb_offset can't be used with unsized arrays.");
2763 /* Make sure nested structs don't contain unsized arrays, and validate
2764 * any xfb_offsets on interface members.
2766 if (t_without_array
->is_record() || t_without_array
->is_interface())
2767 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2768 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2770 /* When the interface block doesn't have an xfb_offset qualifier then
2771 * we apply the component size rules at the member level.
2773 if (xfb_offset
== -1)
2774 component_size
= member_t
->contains_double() ? 8 : 4;
2776 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2777 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2781 /* Nested structs or interface block without offset may not have had an
2782 * offset applied yet so return.
2784 if (xfb_offset
== -1) {
2788 if (xfb_offset
% component_size
) {
2789 _mesa_glsl_error(loc
, state
,
2790 "invalid qualifier xfb_offset=%d must be a multiple "
2791 "of the first component size of the first qualified "
2792 "variable or block member. Or double if an aggregate "
2793 "that contains a double (%d).",
2794 xfb_offset
, component_size
);
2802 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2805 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2806 _mesa_glsl_error(loc
, state
,
2807 "invalid stream specified %d is larger than "
2808 "MAX_VERTEX_STREAMS - 1 (%d).",
2809 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2817 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2820 const glsl_type
*type
,
2821 const ast_type_qualifier
*qual
)
2823 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2824 _mesa_glsl_error(loc
, state
,
2825 "the \"binding\" qualifier only applies to uniforms and "
2826 "shader storage buffer objects");
2830 unsigned qual_binding
;
2831 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2836 const struct gl_context
*const ctx
= state
->ctx
;
2837 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2838 unsigned max_index
= qual_binding
+ elements
- 1;
2839 const glsl_type
*base_type
= type
->without_array();
2841 if (base_type
->is_interface()) {
2842 /* UBOs. From page 60 of the GLSL 4.20 specification:
2843 * "If the binding point for any uniform block instance is less than zero,
2844 * or greater than or equal to the implementation-dependent maximum
2845 * number of uniform buffer bindings, a compilation error will occur.
2846 * When the binding identifier is used with a uniform block instanced as
2847 * an array of size N, all elements of the array from binding through
2848 * binding + N – 1 must be within this range."
2850 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2852 if (qual
->flags
.q
.uniform
&&
2853 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2854 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2855 "the maximum number of UBO binding points (%d)",
2856 qual_binding
, elements
,
2857 ctx
->Const
.MaxUniformBufferBindings
);
2861 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2862 * "If the binding point for any uniform or shader storage block instance
2863 * is less than zero, or greater than or equal to the
2864 * implementation-dependent maximum number of uniform buffer bindings, a
2865 * compile-time error will occur. When the binding identifier is used
2866 * with a uniform or shader storage block instanced as an array of size
2867 * N, all elements of the array from binding through binding + N – 1 must
2868 * be within this range."
2870 if (qual
->flags
.q
.buffer
&&
2871 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2872 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2873 "the maximum number of SSBO binding points (%d)",
2874 qual_binding
, elements
,
2875 ctx
->Const
.MaxShaderStorageBufferBindings
);
2878 } else if (base_type
->is_sampler()) {
2879 /* Samplers. From page 63 of the GLSL 4.20 specification:
2880 * "If the binding is less than zero, or greater than or equal to the
2881 * implementation-dependent maximum supported number of units, a
2882 * compilation error will occur. When the binding identifier is used
2883 * with an array of size N, all elements of the array from binding
2884 * through binding + N - 1 must be within this range."
2886 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2888 if (max_index
>= limit
) {
2889 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2890 "exceeds the maximum number of texture image units "
2891 "(%u)", qual_binding
, elements
, limit
);
2895 } else if (base_type
->contains_atomic()) {
2896 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2897 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2898 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2899 "maximum number of atomic counter buffer bindings "
2900 "(%u)", qual_binding
,
2901 ctx
->Const
.MaxAtomicBufferBindings
);
2905 } else if ((state
->is_version(420, 310) ||
2906 state
->ARB_shading_language_420pack_enable
) &&
2907 base_type
->is_image()) {
2908 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2909 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2910 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2911 "maximum number of image units (%d)", max_index
,
2912 ctx
->Const
.MaxImageUnits
);
2917 _mesa_glsl_error(loc
, state
,
2918 "the \"binding\" qualifier only applies to uniform "
2919 "blocks, storage blocks, opaque variables, or arrays "
2924 var
->data
.explicit_binding
= true;
2925 var
->data
.binding
= qual_binding
;
2931 validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state
*state
,
2933 const glsl_interp_mode interpolation
,
2934 const struct glsl_type
*var_type
,
2935 ir_variable_mode mode
)
2937 if (state
->stage
!= MESA_SHADER_FRAGMENT
||
2938 interpolation
== INTERP_MODE_FLAT
||
2939 mode
!= ir_var_shader_in
)
2942 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2943 * so must integer vertex outputs.
2945 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2946 * "Fragment shader inputs that are signed or unsigned integers or
2947 * integer vectors must be qualified with the interpolation qualifier
2950 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2951 * "Fragment shader inputs that are, or contain, signed or unsigned
2952 * integers or integer vectors must be qualified with the
2953 * interpolation qualifier flat."
2955 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2956 * "Vertex shader outputs that are, or contain, signed or unsigned
2957 * integers or integer vectors must be qualified with the
2958 * interpolation qualifier flat."
2960 * Note that prior to GLSL 1.50, this requirement applied to vertex
2961 * outputs rather than fragment inputs. That creates problems in the
2962 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2963 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2964 * apply the restriction to both vertex outputs and fragment inputs.
2966 * Note also that the desktop GLSL specs are missing the text "or
2967 * contain"; this is presumably an oversight, since there is no
2968 * reasonable way to interpolate a fragment shader input that contains
2969 * an integer. See Khronos bug #15671.
2971 if (state
->is_version(130, 300)
2972 && var_type
->contains_integer()) {
2973 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
2974 "an integer, then it must be qualified with 'flat'");
2977 /* Double fragment inputs must be qualified with 'flat'.
2979 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
2980 * "This extension does not support interpolation of double-precision
2981 * values; doubles used as fragment shader inputs must be qualified as
2984 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
2985 * "Fragment shader inputs that are signed or unsigned integers, integer
2986 * vectors, or any double-precision floating-point type must be
2987 * qualified with the interpolation qualifier flat."
2989 * Note that the GLSL specs are missing the text "or contain"; this is
2990 * presumably an oversight. See Khronos bug #15671.
2992 * The 'double' type does not exist in GLSL ES so far.
2994 if (state
->has_double()
2995 && var_type
->contains_double()) {
2996 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
2997 "a double, then it must be qualified with 'flat'");
3002 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
3004 const glsl_interp_mode interpolation
,
3005 const struct ast_type_qualifier
*qual
,
3006 const struct glsl_type
*var_type
,
3007 ir_variable_mode mode
)
3009 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
3010 * not to vertex shader inputs nor fragment shader outputs.
3012 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3013 * "Outputs from a vertex shader (out) and inputs to a fragment
3014 * shader (in) can be further qualified with one or more of these
3015 * interpolation qualifiers"
3017 * "These interpolation qualifiers may only precede the qualifiers in,
3018 * centroid in, out, or centroid out in a declaration. They do not apply
3019 * to the deprecated storage qualifiers varying or centroid
3020 * varying. They also do not apply to inputs into a vertex shader or
3021 * outputs from a fragment shader."
3023 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
3024 * "Outputs from a shader (out) and inputs to a shader (in) can be
3025 * further qualified with one of these interpolation qualifiers."
3027 * "These interpolation qualifiers may only precede the qualifiers
3028 * in, centroid in, out, or centroid out in a declaration. They do
3029 * not apply to inputs into a vertex shader or outputs from a
3032 if (state
->is_version(130, 300)
3033 && interpolation
!= INTERP_MODE_NONE
) {
3034 const char *i
= interpolation_string(interpolation
);
3035 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
3036 _mesa_glsl_error(loc
, state
,
3037 "interpolation qualifier `%s' can only be applied to "
3038 "shader inputs or outputs.", i
);
3040 switch (state
->stage
) {
3041 case MESA_SHADER_VERTEX
:
3042 if (mode
== ir_var_shader_in
) {
3043 _mesa_glsl_error(loc
, state
,
3044 "interpolation qualifier '%s' cannot be applied to "
3045 "vertex shader inputs", i
);
3048 case MESA_SHADER_FRAGMENT
:
3049 if (mode
== ir_var_shader_out
) {
3050 _mesa_glsl_error(loc
, state
,
3051 "interpolation qualifier '%s' cannot be applied to "
3052 "fragment shader outputs", i
);
3060 /* Interpolation qualifiers cannot be applied to 'centroid' and
3061 * 'centroid varying'.
3063 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3064 * "interpolation qualifiers may only precede the qualifiers in,
3065 * centroid in, out, or centroid out in a declaration. They do not apply
3066 * to the deprecated storage qualifiers varying or centroid varying."
3068 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3070 if (state
->is_version(130, 0)
3071 && interpolation
!= INTERP_MODE_NONE
3072 && qual
->flags
.q
.varying
) {
3074 const char *i
= interpolation_string(interpolation
);
3076 if (qual
->flags
.q
.centroid
)
3077 s
= "centroid varying";
3081 _mesa_glsl_error(loc
, state
,
3082 "qualifier '%s' cannot be applied to the "
3083 "deprecated storage qualifier '%s'", i
, s
);
3086 validate_fragment_flat_interpolation_input(state
, loc
, interpolation
,
3090 static glsl_interp_mode
3091 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3092 const struct glsl_type
*var_type
,
3093 ir_variable_mode mode
,
3094 struct _mesa_glsl_parse_state
*state
,
3097 glsl_interp_mode interpolation
;
3098 if (qual
->flags
.q
.flat
)
3099 interpolation
= INTERP_MODE_FLAT
;
3100 else if (qual
->flags
.q
.noperspective
)
3101 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3102 else if (qual
->flags
.q
.smooth
)
3103 interpolation
= INTERP_MODE_SMOOTH
;
3104 else if (state
->es_shader
&&
3105 ((mode
== ir_var_shader_in
&&
3106 state
->stage
!= MESA_SHADER_VERTEX
) ||
3107 (mode
== ir_var_shader_out
&&
3108 state
->stage
!= MESA_SHADER_FRAGMENT
)))
3109 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
3111 * "When no interpolation qualifier is present, smooth interpolation
3114 interpolation
= INTERP_MODE_SMOOTH
;
3116 interpolation
= INTERP_MODE_NONE
;
3118 validate_interpolation_qualifier(state
, loc
,
3120 qual
, var_type
, mode
);
3122 return interpolation
;
3127 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3129 struct _mesa_glsl_parse_state
*state
,
3134 unsigned qual_location
;
3135 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3140 /* Checks for GL_ARB_explicit_uniform_location. */
3141 if (qual
->flags
.q
.uniform
) {
3142 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3145 const struct gl_context
*const ctx
= state
->ctx
;
3146 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3148 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3149 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3150 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3151 ctx
->Const
.MaxUserAssignableUniformLocations
);
3155 var
->data
.explicit_location
= true;
3156 var
->data
.location
= qual_location
;
3160 /* Between GL_ARB_explicit_attrib_location an
3161 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3162 * stage can be assigned explicit locations. The checking here associates
3163 * the correct extension with the correct stage's input / output:
3167 * vertex explicit_loc sso
3168 * tess control sso sso
3171 * fragment sso explicit_loc
3173 switch (state
->stage
) {
3174 case MESA_SHADER_VERTEX
:
3175 if (var
->data
.mode
== ir_var_shader_in
) {
3176 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3182 if (var
->data
.mode
== ir_var_shader_out
) {
3183 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3192 case MESA_SHADER_TESS_CTRL
:
3193 case MESA_SHADER_TESS_EVAL
:
3194 case MESA_SHADER_GEOMETRY
:
3195 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3196 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3205 case MESA_SHADER_FRAGMENT
:
3206 if (var
->data
.mode
== ir_var_shader_in
) {
3207 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3213 if (var
->data
.mode
== ir_var_shader_out
) {
3214 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3223 case MESA_SHADER_COMPUTE
:
3224 _mesa_glsl_error(loc
, state
,
3225 "compute shader variables cannot be given "
3226 "explicit locations");
3231 _mesa_glsl_error(loc
, state
,
3232 "%s cannot be given an explicit location in %s shader",
3234 _mesa_shader_stage_to_string(state
->stage
));
3236 var
->data
.explicit_location
= true;
3238 switch (state
->stage
) {
3239 case MESA_SHADER_VERTEX
:
3240 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3241 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3242 : (qual_location
+ VARYING_SLOT_VAR0
);
3245 case MESA_SHADER_TESS_CTRL
:
3246 case MESA_SHADER_TESS_EVAL
:
3247 case MESA_SHADER_GEOMETRY
:
3248 if (var
->data
.patch
)
3249 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3251 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3254 case MESA_SHADER_FRAGMENT
:
3255 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3256 ? (qual_location
+ FRAG_RESULT_DATA0
)
3257 : (qual_location
+ VARYING_SLOT_VAR0
);
3259 case MESA_SHADER_COMPUTE
:
3260 assert(!"Unexpected shader type");
3264 /* Check if index was set for the uniform instead of the function */
3265 if (qual
->flags
.q
.explicit_index
&& qual
->is_subroutine_decl()) {
3266 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3267 "used with subroutine functions");
3271 unsigned qual_index
;
3272 if (qual
->flags
.q
.explicit_index
&&
3273 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3275 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3276 * Layout Qualifiers):
3278 * "It is also a compile-time error if a fragment shader
3279 * sets a layout index to less than 0 or greater than 1."
3281 * Older specifications don't mandate a behavior; we take
3282 * this as a clarification and always generate the error.
3284 if (qual_index
> 1) {
3285 _mesa_glsl_error(loc
, state
,
3286 "explicit index may only be 0 or 1");
3288 var
->data
.explicit_index
= true;
3289 var
->data
.index
= qual_index
;
3296 validate_image_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3298 const struct ast_type_qualifier
*qual
,
3299 const glsl_type
*type
)
3301 if (!type
->is_image()) {
3302 if (qual
->flags
.q
.read_only
||
3303 qual
->flags
.q
.write_only
||
3304 qual
->flags
.q
.coherent
||
3305 qual
->flags
.q
._volatile
||
3306 qual
->flags
.q
.restrict_flag
) {
3307 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied "
3311 if (qual
->flags
.q
.explicit_image_format
) {
3312 _mesa_glsl_error(loc
, state
, "format layout qualifiers may only be "
3313 "applied to images");
3321 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3323 struct _mesa_glsl_parse_state
*state
,
3326 const glsl_type
*base_type
= var
->type
->without_array();
3328 if (!validate_image_qualifier_for_type(state
, loc
, qual
, base_type
))
3331 if (var
->data
.mode
!= ir_var_uniform
&&
3332 var
->data
.mode
!= ir_var_function_in
) {
3333 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
3334 "function parameters or uniform-qualified "
3335 "global variables");
3338 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
3339 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
3340 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
3341 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
3342 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
3343 var
->data
.read_only
= true;
3345 if (qual
->flags
.q
.explicit_image_format
) {
3346 if (var
->data
.mode
== ir_var_function_in
) {
3347 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be used on "
3348 "image function parameters");
3351 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3352 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the base "
3353 "data type of the image");
3356 var
->data
.image_format
= qual
->image_format
;
3358 if (var
->data
.mode
== ir_var_uniform
) {
3359 if (state
->es_shader
) {
3360 _mesa_glsl_error(loc
, state
, "all image uniforms must have a "
3361 "format layout qualifier");
3362 } else if (!qual
->flags
.q
.write_only
) {
3363 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3364 "`writeonly' must have a format layout qualifier");
3367 var
->data
.image_format
= GL_NONE
;
3370 /* From page 70 of the GLSL ES 3.1 specification:
3372 * "Except for image variables qualified with the format qualifiers r32f,
3373 * r32i, and r32ui, image variables must specify either memory qualifier
3374 * readonly or the memory qualifier writeonly."
3376 if (state
->es_shader
&&
3377 var
->data
.image_format
!= GL_R32F
&&
3378 var
->data
.image_format
!= GL_R32I
&&
3379 var
->data
.image_format
!= GL_R32UI
&&
3380 !var
->data
.image_read_only
&&
3381 !var
->data
.image_write_only
) {
3382 _mesa_glsl_error(loc
, state
, "image variables of format other than r32f, "
3383 "r32i or r32ui must be qualified `readonly' or "
3388 static inline const char*
3389 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3391 if (origin_upper_left
&& pixel_center_integer
)
3392 return "origin_upper_left, pixel_center_integer";
3393 else if (origin_upper_left
)
3394 return "origin_upper_left";
3395 else if (pixel_center_integer
)
3396 return "pixel_center_integer";
3402 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3403 const struct ast_type_qualifier
*qual
)
3405 /* If gl_FragCoord was previously declared, and the qualifiers were
3406 * different in any way, return true.
3408 if (state
->fs_redeclares_gl_fragcoord
) {
3409 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3410 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3417 validate_array_dimensions(const glsl_type
*t
,
3418 struct _mesa_glsl_parse_state
*state
,
3420 if (t
->is_array()) {
3421 t
= t
->fields
.array
;
3422 while (t
->is_array()) {
3423 if (t
->is_unsized_array()) {
3424 _mesa_glsl_error(loc
, state
,
3425 "only the outermost array dimension can "
3430 t
= t
->fields
.array
;
3436 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3438 struct _mesa_glsl_parse_state
*state
,
3441 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3443 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3445 * "Within any shader, the first redeclarations of gl_FragCoord
3446 * must appear before any use of gl_FragCoord."
3448 * Generate a compiler error if above condition is not met by the
3451 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3452 if (earlier
!= NULL
&&
3453 earlier
->data
.used
&&
3454 !state
->fs_redeclares_gl_fragcoord
) {
3455 _mesa_glsl_error(loc
, state
,
3456 "gl_FragCoord used before its first redeclaration "
3457 "in fragment shader");
3460 /* Make sure all gl_FragCoord redeclarations specify the same layout
3463 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3464 const char *const qual_string
=
3465 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3466 qual
->flags
.q
.pixel_center_integer
);
3468 const char *const state_string
=
3469 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3470 state
->fs_pixel_center_integer
);
3472 _mesa_glsl_error(loc
, state
,
3473 "gl_FragCoord redeclared with different layout "
3474 "qualifiers (%s) and (%s) ",
3478 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3479 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3480 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3481 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3482 state
->fs_redeclares_gl_fragcoord
=
3483 state
->fs_origin_upper_left
||
3484 state
->fs_pixel_center_integer
||
3485 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3488 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3489 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3490 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3491 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3492 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3493 ? "origin_upper_left" : "pixel_center_integer";
3495 _mesa_glsl_error(loc
, state
,
3496 "layout qualifier `%s' can only be applied to "
3497 "fragment shader input `gl_FragCoord'",
3501 if (qual
->flags
.q
.explicit_location
) {
3502 apply_explicit_location(qual
, var
, state
, loc
);
3504 if (qual
->flags
.q
.explicit_component
) {
3505 unsigned qual_component
;
3506 if (process_qualifier_constant(state
, loc
, "component",
3507 qual
->component
, &qual_component
)) {
3508 const glsl_type
*type
= var
->type
->without_array();
3509 unsigned components
= type
->component_slots();
3511 if (type
->is_matrix() || type
->is_record()) {
3512 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3513 "cannot be applied to a matrix, a structure, "
3514 "a block, or an array containing any of "
3516 } else if (qual_component
!= 0 &&
3517 (qual_component
+ components
- 1) > 3) {
3518 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3519 (qual_component
+ components
- 1));
3520 } else if (qual_component
== 1 && type
->is_64bit()) {
3521 /* We don't bother checking for 3 as it should be caught by the
3522 * overflow check above.
3524 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3525 "component 1 or 3");
3527 var
->data
.explicit_component
= true;
3528 var
->data
.location_frac
= qual_component
;
3532 } else if (qual
->flags
.q
.explicit_index
) {
3533 if (!qual
->subroutine_list
)
3534 _mesa_glsl_error(loc
, state
,
3535 "explicit index requires explicit location");
3536 } else if (qual
->flags
.q
.explicit_component
) {
3537 _mesa_glsl_error(loc
, state
,
3538 "explicit component requires explicit location");
3541 if (qual
->flags
.q
.explicit_binding
) {
3542 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3545 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3546 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3547 unsigned qual_stream
;
3548 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3550 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3551 var
->data
.stream
= qual_stream
;
3555 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3556 unsigned qual_xfb_buffer
;
3557 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3558 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3559 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3560 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3561 if (qual
->flags
.q
.explicit_xfb_buffer
)
3562 var
->data
.explicit_xfb_buffer
= true;
3566 if (qual
->flags
.q
.explicit_xfb_offset
) {
3567 unsigned qual_xfb_offset
;
3568 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3570 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3571 qual
->offset
, &qual_xfb_offset
) &&
3572 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3573 var
->type
, component_size
)) {
3574 var
->data
.offset
= qual_xfb_offset
;
3575 var
->data
.explicit_xfb_offset
= true;
3579 if (qual
->flags
.q
.explicit_xfb_stride
) {
3580 unsigned qual_xfb_stride
;
3581 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3582 qual
->xfb_stride
, &qual_xfb_stride
)) {
3583 var
->data
.xfb_stride
= qual_xfb_stride
;
3584 var
->data
.explicit_xfb_stride
= true;
3588 if (var
->type
->contains_atomic()) {
3589 if (var
->data
.mode
== ir_var_uniform
) {
3590 if (var
->data
.explicit_binding
) {
3592 &state
->atomic_counter_offsets
[var
->data
.binding
];
3594 if (*offset
% ATOMIC_COUNTER_SIZE
)
3595 _mesa_glsl_error(loc
, state
,
3596 "misaligned atomic counter offset");
3598 var
->data
.offset
= *offset
;
3599 *offset
+= var
->type
->atomic_size();
3602 _mesa_glsl_error(loc
, state
,
3603 "atomic counters require explicit binding point");
3605 } else if (var
->data
.mode
!= ir_var_function_in
) {
3606 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3607 "function parameters or uniform-qualified "
3608 "global variables");
3612 if (var
->type
->contains_sampler()) {
3613 if (var
->data
.mode
!= ir_var_uniform
&&
3614 var
->data
.mode
!= ir_var_function_in
) {
3615 _mesa_glsl_error(loc
, state
, "sampler variables may only be declared "
3616 "as function parameters or uniform-qualified "
3617 "global variables");
3621 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3622 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3623 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3624 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3625 * These extensions and all following extensions that add the 'layout'
3626 * keyword have been modified to require the use of 'in' or 'out'.
3628 * The following extension do not allow the deprecated keywords:
3630 * GL_AMD_conservative_depth
3631 * GL_ARB_conservative_depth
3632 * GL_ARB_gpu_shader5
3633 * GL_ARB_separate_shader_objects
3634 * GL_ARB_tessellation_shader
3635 * GL_ARB_transform_feedback3
3636 * GL_ARB_uniform_buffer_object
3638 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3639 * allow layout with the deprecated keywords.
3641 const bool relaxed_layout_qualifier_checking
=
3642 state
->ARB_fragment_coord_conventions_enable
;
3644 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3645 || qual
->flags
.q
.varying
;
3646 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3647 if (relaxed_layout_qualifier_checking
) {
3648 _mesa_glsl_warning(loc
, state
,
3649 "`layout' qualifier may not be used with "
3650 "`attribute' or `varying'");
3652 _mesa_glsl_error(loc
, state
,
3653 "`layout' qualifier may not be used with "
3654 "`attribute' or `varying'");
3658 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3659 * AMD_conservative_depth.
3661 if (qual
->flags
.q
.depth_type
3662 && !state
->is_version(420, 0)
3663 && !state
->AMD_conservative_depth_enable
3664 && !state
->ARB_conservative_depth_enable
) {
3665 _mesa_glsl_error(loc
, state
,
3666 "extension GL_AMD_conservative_depth or "
3667 "GL_ARB_conservative_depth must be enabled "
3668 "to use depth layout qualifiers");
3669 } else if (qual
->flags
.q
.depth_type
3670 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3671 _mesa_glsl_error(loc
, state
,
3672 "depth layout qualifiers can be applied only to "
3676 switch (qual
->depth_type
) {
3678 var
->data
.depth_layout
= ir_depth_layout_any
;
3680 case ast_depth_greater
:
3681 var
->data
.depth_layout
= ir_depth_layout_greater
;
3683 case ast_depth_less
:
3684 var
->data
.depth_layout
= ir_depth_layout_less
;
3686 case ast_depth_unchanged
:
3687 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3690 var
->data
.depth_layout
= ir_depth_layout_none
;
3694 if (qual
->flags
.q
.std140
||
3695 qual
->flags
.q
.std430
||
3696 qual
->flags
.q
.packed
||
3697 qual
->flags
.q
.shared
) {
3698 _mesa_glsl_error(loc
, state
,
3699 "uniform and shader storage block layout qualifiers "
3700 "std140, std430, packed, and shared can only be "
3701 "applied to uniform or shader storage blocks, not "
3705 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3706 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3709 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3712 * "Fragment shaders also allow the following layout qualifier on in only
3713 * (not with variable declarations)
3714 * layout-qualifier-id
3715 * early_fragment_tests
3718 if (qual
->flags
.q
.early_fragment_tests
) {
3719 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3720 "valid in fragment shader input layout declaration.");
3723 if (qual
->flags
.q
.inner_coverage
) {
3724 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3725 "valid in fragment shader input layout declaration.");
3728 if (qual
->flags
.q
.post_depth_coverage
) {
3729 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3730 "valid in fragment shader input layout declaration.");
3735 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3737 struct _mesa_glsl_parse_state
*state
,
3741 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3743 if (qual
->flags
.q
.invariant
) {
3744 if (var
->data
.used
) {
3745 _mesa_glsl_error(loc
, state
,
3746 "variable `%s' may not be redeclared "
3747 "`invariant' after being used",
3750 var
->data
.invariant
= 1;
3754 if (qual
->flags
.q
.precise
) {
3755 if (var
->data
.used
) {
3756 _mesa_glsl_error(loc
, state
,
3757 "variable `%s' may not be redeclared "
3758 "`precise' after being used",
3761 var
->data
.precise
= 1;
3765 if (qual
->is_subroutine_decl() && !qual
->flags
.q
.uniform
) {
3766 _mesa_glsl_error(loc
, state
,
3767 "`subroutine' may only be applied to uniforms, "
3768 "subroutine type declarations, or function definitions");
3771 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3772 || qual
->flags
.q
.uniform
3773 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3774 var
->data
.read_only
= 1;
3776 if (qual
->flags
.q
.centroid
)
3777 var
->data
.centroid
= 1;
3779 if (qual
->flags
.q
.sample
)
3780 var
->data
.sample
= 1;
3782 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3783 if (state
->es_shader
) {
3784 var
->data
.precision
=
3785 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3788 if (qual
->flags
.q
.patch
)
3789 var
->data
.patch
= 1;
3791 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3792 var
->type
= glsl_type::error_type
;
3793 _mesa_glsl_error(loc
, state
,
3794 "`attribute' variables may not be declared in the "
3796 _mesa_shader_stage_to_string(state
->stage
));
3799 /* Disallow layout qualifiers which may only appear on layout declarations. */
3800 if (qual
->flags
.q
.prim_type
) {
3801 _mesa_glsl_error(loc
, state
,
3802 "Primitive type may only be specified on GS input or output "
3803 "layout declaration, not on variables.");
3806 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3808 * "However, the const qualifier cannot be used with out or inout."
3810 * The same section of the GLSL 4.40 spec further clarifies this saying:
3812 * "The const qualifier cannot be used with out or inout, or a
3813 * compile-time error results."
3815 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3816 _mesa_glsl_error(loc
, state
,
3817 "`const' may not be applied to `out' or `inout' "
3818 "function parameters");
3821 /* If there is no qualifier that changes the mode of the variable, leave
3822 * the setting alone.
3824 assert(var
->data
.mode
!= ir_var_temporary
);
3825 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3826 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
3827 else if (qual
->flags
.q
.in
)
3828 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3829 else if (qual
->flags
.q
.attribute
3830 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3831 var
->data
.mode
= ir_var_shader_in
;
3832 else if (qual
->flags
.q
.out
)
3833 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3834 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3835 var
->data
.mode
= ir_var_shader_out
;
3836 else if (qual
->flags
.q
.uniform
)
3837 var
->data
.mode
= ir_var_uniform
;
3838 else if (qual
->flags
.q
.buffer
)
3839 var
->data
.mode
= ir_var_shader_storage
;
3840 else if (qual
->flags
.q
.shared_storage
)
3841 var
->data
.mode
= ir_var_shader_shared
;
3843 var
->data
.fb_fetch_output
= state
->stage
== MESA_SHADER_FRAGMENT
&&
3844 qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
3846 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3847 /* User-defined ins/outs are not permitted in compute shaders. */
3848 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3849 _mesa_glsl_error(loc
, state
,
3850 "user-defined input and output variables are not "
3851 "permitted in compute shaders");
3854 /* This variable is being used to link data between shader stages (in
3855 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3856 * that is allowed for such purposes.
3858 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3860 * "The varying qualifier can be used only with the data types
3861 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3864 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3865 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3867 * "Fragment inputs can only be signed and unsigned integers and
3868 * integer vectors, float, floating-point vectors, matrices, or
3869 * arrays of these. Structures cannot be input.
3871 * Similar text exists in the section on vertex shader outputs.
3873 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3874 * 3.00 spec allows structs as well. Varying structs are also allowed
3877 switch (var
->type
->without_array()->base_type
) {
3878 case GLSL_TYPE_FLOAT
:
3879 /* Ok in all GLSL versions */
3881 case GLSL_TYPE_UINT
:
3883 if (state
->is_version(130, 300))
3885 _mesa_glsl_error(loc
, state
,
3886 "varying variables must be of base type float in %s",
3887 state
->get_version_string());
3889 case GLSL_TYPE_STRUCT
:
3890 if (state
->is_version(150, 300))
3892 _mesa_glsl_error(loc
, state
,
3893 "varying variables may not be of type struct");
3895 case GLSL_TYPE_DOUBLE
:
3896 case GLSL_TYPE_UINT64
:
3897 case GLSL_TYPE_INT64
:
3900 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3905 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3906 switch (state
->stage
) {
3907 case MESA_SHADER_VERTEX
:
3908 if (var
->data
.mode
== ir_var_shader_out
)
3909 var
->data
.invariant
= true;
3911 case MESA_SHADER_TESS_CTRL
:
3912 case MESA_SHADER_TESS_EVAL
:
3913 case MESA_SHADER_GEOMETRY
:
3914 if ((var
->data
.mode
== ir_var_shader_in
)
3915 || (var
->data
.mode
== ir_var_shader_out
))
3916 var
->data
.invariant
= true;
3918 case MESA_SHADER_FRAGMENT
:
3919 if (var
->data
.mode
== ir_var_shader_in
)
3920 var
->data
.invariant
= true;
3922 case MESA_SHADER_COMPUTE
:
3923 /* Invariance isn't meaningful in compute shaders. */
3928 var
->data
.interpolation
=
3929 interpret_interpolation_qualifier(qual
, var
->type
,
3930 (ir_variable_mode
) var
->data
.mode
,
3933 /* Does the declaration use the deprecated 'attribute' or 'varying'
3936 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3937 || qual
->flags
.q
.varying
;
3940 /* Validate auxiliary storage qualifiers */
3942 /* From section 4.3.4 of the GLSL 1.30 spec:
3943 * "It is an error to use centroid in in a vertex shader."
3945 * From section 4.3.4 of the GLSL ES 3.00 spec:
3946 * "It is an error to use centroid in or interpolation qualifiers in
3947 * a vertex shader input."
3950 /* Section 4.3.6 of the GLSL 1.30 specification states:
3951 * "It is an error to use centroid out in a fragment shader."
3953 * The GL_ARB_shading_language_420pack extension specification states:
3954 * "It is an error to use auxiliary storage qualifiers or interpolation
3955 * qualifiers on an output in a fragment shader."
3957 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3958 _mesa_glsl_error(loc
, state
,
3959 "sample qualifier may only be used on `in` or `out` "
3960 "variables between shader stages");
3962 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3963 _mesa_glsl_error(loc
, state
,
3964 "centroid qualifier may only be used with `in', "
3965 "`out' or `varying' variables between shader stages");
3968 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3969 _mesa_glsl_error(loc
, state
,
3970 "the shared storage qualifiers can only be used with "
3974 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3978 * Get the variable that is being redeclared by this declaration or if it
3979 * does not exist, the current declared variable.
3981 * Semantic checks to verify the validity of the redeclaration are also
3982 * performed. If semantic checks fail, compilation error will be emitted via
3983 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3986 * A pointer to an existing variable in the current scope if the declaration
3987 * is a redeclaration, current variable otherwise. \c is_declared boolean
3988 * will return \c true if the declaration is a redeclaration, \c false
3991 static ir_variable
*
3992 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3993 struct _mesa_glsl_parse_state
*state
,
3994 bool allow_all_redeclarations
,
3995 bool *is_redeclaration
)
3997 /* Check if this declaration is actually a re-declaration, either to
3998 * resize an array or add qualifiers to an existing variable.
4000 * This is allowed for variables in the current scope, or when at
4001 * global scope (for built-ins in the implicit outer scope).
4003 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
4004 if (earlier
== NULL
||
4005 (state
->current_function
!= NULL
&&
4006 !state
->symbols
->name_declared_this_scope(var
->name
))) {
4007 *is_redeclaration
= false;
4011 *is_redeclaration
= true;
4013 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4015 * "It is legal to declare an array without a size and then
4016 * later re-declare the same name as an array of the same
4017 * type and specify a size."
4019 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
4020 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
4021 /* FINISHME: This doesn't match the qualifiers on the two
4022 * FINISHME: declarations. It's not 100% clear whether this is
4023 * FINISHME: required or not.
4026 const int size
= var
->type
->array_size();
4027 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
4028 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4029 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4031 earlier
->data
.max_array_access
);
4034 earlier
->type
= var
->type
;
4037 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4038 state
->is_version(150, 0))
4039 && strcmp(var
->name
, "gl_FragCoord") == 0
4040 && earlier
->type
== var
->type
4041 && var
->data
.mode
== ir_var_shader_in
) {
4042 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4045 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
4046 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
4048 /* According to section 4.3.7 of the GLSL 1.30 spec,
4049 * the following built-in varaibles can be redeclared with an
4050 * interpolation qualifier:
4053 * * gl_FrontSecondaryColor
4054 * * gl_BackSecondaryColor
4056 * * gl_SecondaryColor
4058 } else if (state
->is_version(130, 0)
4059 && (strcmp(var
->name
, "gl_FrontColor") == 0
4060 || strcmp(var
->name
, "gl_BackColor") == 0
4061 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4062 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4063 || strcmp(var
->name
, "gl_Color") == 0
4064 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
4065 && earlier
->type
== var
->type
4066 && earlier
->data
.mode
== var
->data
.mode
) {
4067 earlier
->data
.interpolation
= var
->data
.interpolation
;
4069 /* Layout qualifiers for gl_FragDepth. */
4070 } else if ((state
->is_version(420, 0) ||
4071 state
->AMD_conservative_depth_enable
||
4072 state
->ARB_conservative_depth_enable
)
4073 && strcmp(var
->name
, "gl_FragDepth") == 0
4074 && earlier
->type
== var
->type
4075 && earlier
->data
.mode
== var
->data
.mode
) {
4077 /** From the AMD_conservative_depth spec:
4078 * Within any shader, the first redeclarations of gl_FragDepth
4079 * must appear before any use of gl_FragDepth.
4081 if (earlier
->data
.used
) {
4082 _mesa_glsl_error(&loc
, state
,
4083 "the first redeclaration of gl_FragDepth "
4084 "must appear before any use of gl_FragDepth");
4087 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4088 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4089 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4090 _mesa_glsl_error(&loc
, state
,
4091 "gl_FragDepth: depth layout is declared here "
4092 "as '%s, but it was previously declared as "
4094 depth_layout_string(var
->data
.depth_layout
),
4095 depth_layout_string(earlier
->data
.depth_layout
));
4098 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4100 } else if (state
->has_framebuffer_fetch() &&
4101 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4102 var
->type
== earlier
->type
&&
4103 var
->data
.mode
== ir_var_auto
) {
4104 /* According to the EXT_shader_framebuffer_fetch spec:
4106 * "By default, gl_LastFragData is declared with the mediump precision
4107 * qualifier. This can be changed by redeclaring the corresponding
4108 * variables with the desired precision qualifier."
4110 earlier
->data
.precision
= var
->data
.precision
;
4112 } else if (allow_all_redeclarations
) {
4113 if (earlier
->data
.mode
!= var
->data
.mode
) {
4114 _mesa_glsl_error(&loc
, state
,
4115 "redeclaration of `%s' with incorrect qualifiers",
4117 } else if (earlier
->type
!= var
->type
) {
4118 _mesa_glsl_error(&loc
, state
,
4119 "redeclaration of `%s' has incorrect type",
4123 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4130 * Generate the IR for an initializer in a variable declaration
4133 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4134 ast_fully_specified_type
*type
,
4135 exec_list
*initializer_instructions
,
4136 struct _mesa_glsl_parse_state
*state
)
4138 ir_rvalue
*result
= NULL
;
4140 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4142 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4144 * "All uniform variables are read-only and are initialized either
4145 * directly by an application via API commands, or indirectly by
4148 if (var
->data
.mode
== ir_var_uniform
) {
4149 state
->check_version(120, 0, &initializer_loc
,
4150 "cannot initialize uniform %s",
4154 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4156 * "Buffer variables cannot have initializers."
4158 if (var
->data
.mode
== ir_var_shader_storage
) {
4159 _mesa_glsl_error(&initializer_loc
, state
,
4160 "cannot initialize buffer variable %s",
4164 /* From section 4.1.7 of the GLSL 4.40 spec:
4166 * "Opaque variables [...] are initialized only through the
4167 * OpenGL API; they cannot be declared with an initializer in a
4170 if (var
->type
->contains_opaque()) {
4171 _mesa_glsl_error(&initializer_loc
, state
,
4172 "cannot initialize opaque variable %s",
4176 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4177 _mesa_glsl_error(&initializer_loc
, state
,
4178 "cannot initialize %s shader input / %s %s",
4179 _mesa_shader_stage_to_string(state
->stage
),
4180 (state
->stage
== MESA_SHADER_VERTEX
)
4181 ? "attribute" : "varying",
4185 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4186 _mesa_glsl_error(&initializer_loc
, state
,
4187 "cannot initialize %s shader output %s",
4188 _mesa_shader_stage_to_string(state
->stage
),
4192 /* If the initializer is an ast_aggregate_initializer, recursively store
4193 * type information from the LHS into it, so that its hir() function can do
4196 if (decl
->initializer
->oper
== ast_aggregate
)
4197 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4199 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4200 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4202 /* Calculate the constant value if this is a const or uniform
4205 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4207 * "Declarations of globals without a storage qualifier, or with
4208 * just the const qualifier, may include initializers, in which case
4209 * they will be initialized before the first line of main() is
4210 * executed. Such initializers must be a constant expression."
4212 * The same section of the GLSL ES 3.00.4 spec has similar language.
4214 if (type
->qualifier
.flags
.q
.constant
4215 || type
->qualifier
.flags
.q
.uniform
4216 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4217 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4219 if (new_rhs
!= NULL
) {
4222 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4225 * "A constant expression is one of
4229 * - an expression formed by an operator on operands that are
4230 * all constant expressions, including getting an element of
4231 * a constant array, or a field of a constant structure, or
4232 * components of a constant vector. However, the sequence
4233 * operator ( , ) and the assignment operators ( =, +=, ...)
4234 * are not included in the operators that can create a
4235 * constant expression."
4237 * Section 12.43 (Sequence operator and constant expressions) says:
4239 * "Should the following construct be allowed?
4243 * The expression within the brackets uses the sequence operator
4244 * (',') and returns the integer 3 so the construct is declaring
4245 * a single-dimensional array of size 3. In some languages, the
4246 * construct declares a two-dimensional array. It would be
4247 * preferable to make this construct illegal to avoid confusion.
4249 * One possibility is to change the definition of the sequence
4250 * operator so that it does not return a constant-expression and
4251 * hence cannot be used to declare an array size.
4253 * RESOLUTION: The result of a sequence operator is not a
4254 * constant-expression."
4256 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4257 * contains language almost identical to the section 4.3.3 in the
4258 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4261 ir_constant
*constant_value
= rhs
->constant_expression_value();
4262 if (!constant_value
||
4263 (state
->is_version(430, 300) &&
4264 decl
->initializer
->has_sequence_subexpression())) {
4265 const char *const variable_mode
=
4266 (type
->qualifier
.flags
.q
.constant
)
4268 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4270 /* If ARB_shading_language_420pack is enabled, initializers of
4271 * const-qualified local variables do not have to be constant
4272 * expressions. Const-qualified global variables must still be
4273 * initialized with constant expressions.
4275 if (!state
->has_420pack()
4276 || state
->current_function
== NULL
) {
4277 _mesa_glsl_error(& initializer_loc
, state
,
4278 "initializer of %s variable `%s' must be a "
4279 "constant expression",
4282 if (var
->type
->is_numeric()) {
4283 /* Reduce cascading errors. */
4284 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4285 ? ir_constant::zero(state
, var
->type
) : NULL
;
4289 rhs
= constant_value
;
4290 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4291 ? constant_value
: NULL
;
4294 if (var
->type
->is_numeric()) {
4295 /* Reduce cascading errors. */
4296 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4297 ? ir_constant::zero(state
, var
->type
) : NULL
;
4302 if (rhs
&& !rhs
->type
->is_error()) {
4303 bool temp
= var
->data
.read_only
;
4304 if (type
->qualifier
.flags
.q
.constant
)
4305 var
->data
.read_only
= false;
4307 /* Never emit code to initialize a uniform.
4309 const glsl_type
*initializer_type
;
4310 if (!type
->qualifier
.flags
.q
.uniform
) {
4311 do_assignment(initializer_instructions
, state
,
4316 type
->get_location());
4317 initializer_type
= result
->type
;
4319 initializer_type
= rhs
->type
;
4321 var
->constant_initializer
= rhs
->constant_expression_value();
4322 var
->data
.has_initializer
= true;
4324 /* If the declared variable is an unsized array, it must inherrit
4325 * its full type from the initializer. A declaration such as
4327 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4331 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4333 * The assignment generated in the if-statement (below) will also
4334 * automatically handle this case for non-uniforms.
4336 * If the declared variable is not an array, the types must
4337 * already match exactly. As a result, the type assignment
4338 * here can be done unconditionally. For non-uniforms the call
4339 * to do_assignment can change the type of the initializer (via
4340 * the implicit conversion rules). For uniforms the initializer
4341 * must be a constant expression, and the type of that expression
4342 * was validated above.
4344 var
->type
= initializer_type
;
4346 var
->data
.read_only
= temp
;
4353 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4354 YYLTYPE loc
, ir_variable
*var
,
4355 unsigned num_vertices
,
4357 const char *var_category
)
4359 if (var
->type
->is_unsized_array()) {
4360 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4362 * All geometry shader input unsized array declarations will be
4363 * sized by an earlier input layout qualifier, when present, as per
4364 * the following table.
4366 * Followed by a table mapping each allowed input layout qualifier to
4367 * the corresponding input length.
4369 * Similarly for tessellation control shader outputs.
4371 if (num_vertices
!= 0)
4372 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4375 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4376 * includes the following examples of compile-time errors:
4378 * // code sequence within one shader...
4379 * in vec4 Color1[]; // size unknown
4380 * ...Color1.length()...// illegal, length() unknown
4381 * in vec4 Color2[2]; // size is 2
4382 * ...Color1.length()...// illegal, Color1 still has no size
4383 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4384 * layout(lines) in; // legal, input size is 2, matching
4385 * in vec4 Color4[3]; // illegal, contradicts layout
4388 * To detect the case illustrated by Color3, we verify that the size of
4389 * an explicitly-sized array matches the size of any previously declared
4390 * explicitly-sized array. To detect the case illustrated by Color4, we
4391 * verify that the size of an explicitly-sized array is consistent with
4392 * any previously declared input layout.
4394 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4395 _mesa_glsl_error(&loc
, state
,
4396 "%s size contradicts previously declared layout "
4397 "(size is %u, but layout requires a size of %u)",
4398 var_category
, var
->type
->length
, num_vertices
);
4399 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4400 _mesa_glsl_error(&loc
, state
,
4401 "%s sizes are inconsistent (size is %u, but a "
4402 "previous declaration has size %u)",
4403 var_category
, var
->type
->length
, *size
);
4405 *size
= var
->type
->length
;
4411 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4412 YYLTYPE loc
, ir_variable
*var
)
4414 unsigned num_vertices
= 0;
4416 if (state
->tcs_output_vertices_specified
) {
4417 if (!state
->out_qualifier
->vertices
->
4418 process_qualifier_constant(state
, "vertices",
4419 &num_vertices
, false)) {
4423 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4424 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4425 "GL_MAX_PATCH_VERTICES", num_vertices
);
4430 if (!var
->type
->is_array() && !var
->data
.patch
) {
4431 _mesa_glsl_error(&loc
, state
,
4432 "tessellation control shader outputs must be arrays");
4434 /* To avoid cascading failures, short circuit the checks below. */
4438 if (var
->data
.patch
)
4441 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4442 &state
->tcs_output_size
,
4443 "tessellation control shader output");
4447 * Do additional processing necessary for tessellation control/evaluation shader
4448 * input declarations. This covers both interface block arrays and bare input
4452 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4453 YYLTYPE loc
, ir_variable
*var
)
4455 if (!var
->type
->is_array() && !var
->data
.patch
) {
4456 _mesa_glsl_error(&loc
, state
,
4457 "per-vertex tessellation shader inputs must be arrays");
4458 /* Avoid cascading failures. */
4462 if (var
->data
.patch
)
4465 /* The ARB_tessellation_shader spec says:
4467 * "Declaring an array size is optional. If no size is specified, it
4468 * will be taken from the implementation-dependent maximum patch size
4469 * (gl_MaxPatchVertices). If a size is specified, it must match the
4470 * maximum patch size; otherwise, a compile or link error will occur."
4472 * This text appears twice, once for TCS inputs, and again for TES inputs.
4474 if (var
->type
->is_unsized_array()) {
4475 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4476 state
->Const
.MaxPatchVertices
);
4477 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4478 _mesa_glsl_error(&loc
, state
,
4479 "per-vertex tessellation shader input arrays must be "
4480 "sized to gl_MaxPatchVertices (%d).",
4481 state
->Const
.MaxPatchVertices
);
4487 * Do additional processing necessary for geometry shader input declarations
4488 * (this covers both interface blocks arrays and bare input variables).
4491 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4492 YYLTYPE loc
, ir_variable
*var
)
4494 unsigned num_vertices
= 0;
4496 if (state
->gs_input_prim_type_specified
) {
4497 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4500 /* Geometry shader input variables must be arrays. Caller should have
4501 * reported an error for this.
4503 if (!var
->type
->is_array()) {
4504 assert(state
->error
);
4506 /* To avoid cascading failures, short circuit the checks below. */
4510 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4511 &state
->gs_input_size
,
4512 "geometry shader input");
4516 validate_identifier(const char *identifier
, YYLTYPE loc
,
4517 struct _mesa_glsl_parse_state
*state
)
4519 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4521 * "Identifiers starting with "gl_" are reserved for use by
4522 * OpenGL, and may not be declared in a shader as either a
4523 * variable or a function."
4525 if (is_gl_identifier(identifier
)) {
4526 _mesa_glsl_error(&loc
, state
,
4527 "identifier `%s' uses reserved `gl_' prefix",
4529 } else if (strstr(identifier
, "__")) {
4530 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4533 * "In addition, all identifiers containing two
4534 * consecutive underscores (__) are reserved as
4535 * possible future keywords."
4537 * The intention is that names containing __ are reserved for internal
4538 * use by the implementation, and names prefixed with GL_ are reserved
4539 * for use by Khronos. Names simply containing __ are dangerous to use,
4540 * but should be allowed.
4542 * A future version of the GLSL specification will clarify this.
4544 _mesa_glsl_warning(&loc
, state
,
4545 "identifier `%s' uses reserved `__' string",
4551 ast_declarator_list::hir(exec_list
*instructions
,
4552 struct _mesa_glsl_parse_state
*state
)
4555 const struct glsl_type
*decl_type
;
4556 const char *type_name
= NULL
;
4557 ir_rvalue
*result
= NULL
;
4558 YYLTYPE loc
= this->get_location();
4560 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4562 * "To ensure that a particular output variable is invariant, it is
4563 * necessary to use the invariant qualifier. It can either be used to
4564 * qualify a previously declared variable as being invariant
4566 * invariant gl_Position; // make existing gl_Position be invariant"
4568 * In these cases the parser will set the 'invariant' flag in the declarator
4569 * list, and the type will be NULL.
4571 if (this->invariant
) {
4572 assert(this->type
== NULL
);
4574 if (state
->current_function
!= NULL
) {
4575 _mesa_glsl_error(& loc
, state
,
4576 "all uses of `invariant' keyword must be at global "
4580 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4581 assert(decl
->array_specifier
== NULL
);
4582 assert(decl
->initializer
== NULL
);
4584 ir_variable
*const earlier
=
4585 state
->symbols
->get_variable(decl
->identifier
);
4586 if (earlier
== NULL
) {
4587 _mesa_glsl_error(& loc
, state
,
4588 "undeclared variable `%s' cannot be marked "
4589 "invariant", decl
->identifier
);
4590 } else if (!is_allowed_invariant(earlier
, state
)) {
4591 _mesa_glsl_error(&loc
, state
,
4592 "`%s' cannot be marked invariant; interfaces between "
4593 "shader stages only.", decl
->identifier
);
4594 } else if (earlier
->data
.used
) {
4595 _mesa_glsl_error(& loc
, state
,
4596 "variable `%s' may not be redeclared "
4597 "`invariant' after being used",
4600 earlier
->data
.invariant
= true;
4604 /* Invariant redeclarations do not have r-values.
4609 if (this->precise
) {
4610 assert(this->type
== NULL
);
4612 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4613 assert(decl
->array_specifier
== NULL
);
4614 assert(decl
->initializer
== NULL
);
4616 ir_variable
*const earlier
=
4617 state
->symbols
->get_variable(decl
->identifier
);
4618 if (earlier
== NULL
) {
4619 _mesa_glsl_error(& loc
, state
,
4620 "undeclared variable `%s' cannot be marked "
4621 "precise", decl
->identifier
);
4622 } else if (state
->current_function
!= NULL
&&
4623 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4624 /* Note: we have to check if we're in a function, since
4625 * builtins are treated as having come from another scope.
4627 _mesa_glsl_error(& loc
, state
,
4628 "variable `%s' from an outer scope may not be "
4629 "redeclared `precise' in this scope",
4631 } else if (earlier
->data
.used
) {
4632 _mesa_glsl_error(& loc
, state
,
4633 "variable `%s' may not be redeclared "
4634 "`precise' after being used",
4637 earlier
->data
.precise
= true;
4641 /* Precise redeclarations do not have r-values either. */
4645 assert(this->type
!= NULL
);
4646 assert(!this->invariant
);
4647 assert(!this->precise
);
4649 /* The type specifier may contain a structure definition. Process that
4650 * before any of the variable declarations.
4652 (void) this->type
->specifier
->hir(instructions
, state
);
4654 decl_type
= this->type
->glsl_type(& type_name
, state
);
4656 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4657 * "Buffer variables may only be declared inside interface blocks
4658 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4659 * shader storage blocks. It is a compile-time error to declare buffer
4660 * variables at global scope (outside a block)."
4662 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4663 _mesa_glsl_error(&loc
, state
,
4664 "buffer variables cannot be declared outside "
4665 "interface blocks");
4668 /* An offset-qualified atomic counter declaration sets the default
4669 * offset for the next declaration within the same atomic counter
4672 if (decl_type
&& decl_type
->contains_atomic()) {
4673 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4674 type
->qualifier
.flags
.q
.explicit_offset
) {
4675 unsigned qual_binding
;
4676 unsigned qual_offset
;
4677 if (process_qualifier_constant(state
, &loc
, "binding",
4678 type
->qualifier
.binding
,
4680 && process_qualifier_constant(state
, &loc
, "offset",
4681 type
->qualifier
.offset
,
4683 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4687 ast_type_qualifier allowed_atomic_qual_mask
;
4688 allowed_atomic_qual_mask
.flags
.i
= 0;
4689 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4690 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4691 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4693 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4694 "invalid layout qualifier for",
4698 if (this->declarations
.is_empty()) {
4699 /* If there is no structure involved in the program text, there are two
4700 * possible scenarios:
4702 * - The program text contained something like 'vec4;'. This is an
4703 * empty declaration. It is valid but weird. Emit a warning.
4705 * - The program text contained something like 'S;' and 'S' is not the
4706 * name of a known structure type. This is both invalid and weird.
4709 * - The program text contained something like 'mediump float;'
4710 * when the programmer probably meant 'precision mediump
4711 * float;' Emit a warning with a description of what they
4712 * probably meant to do.
4714 * Note that if decl_type is NULL and there is a structure involved,
4715 * there must have been some sort of error with the structure. In this
4716 * case we assume that an error was already generated on this line of
4717 * code for the structure. There is no need to generate an additional,
4720 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4723 if (decl_type
== NULL
) {
4724 _mesa_glsl_error(&loc
, state
,
4725 "invalid type `%s' in empty declaration",
4728 if (decl_type
->is_array()) {
4729 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4732 * "... any declaration that leaves the size undefined is
4733 * disallowed as this would add complexity and there are no
4736 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4737 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4738 "or implicitly defined");
4741 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4743 * "The combinations of types and qualifiers that cause
4744 * compile-time or link-time errors are the same whether or not
4745 * the declaration is empty."
4747 validate_array_dimensions(decl_type
, state
, &loc
);
4750 if (decl_type
->is_atomic_uint()) {
4751 /* Empty atomic counter declarations are allowed and useful
4752 * to set the default offset qualifier.
4755 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4756 if (this->type
->specifier
->structure
!= NULL
) {
4757 _mesa_glsl_error(&loc
, state
,
4758 "precision qualifiers can't be applied "
4761 static const char *const precision_names
[] = {
4768 _mesa_glsl_warning(&loc
, state
,
4769 "empty declaration with precision "
4770 "qualifier, to set the default precision, "
4771 "use `precision %s %s;'",
4772 precision_names
[this->type
->
4773 qualifier
.precision
],
4776 } else if (this->type
->specifier
->structure
== NULL
) {
4777 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4782 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4783 const struct glsl_type
*var_type
;
4785 const char *identifier
= decl
->identifier
;
4786 /* FINISHME: Emit a warning if a variable declaration shadows a
4787 * FINISHME: declaration at a higher scope.
4790 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4791 if (type_name
!= NULL
) {
4792 _mesa_glsl_error(& loc
, state
,
4793 "invalid type `%s' in declaration of `%s'",
4794 type_name
, decl
->identifier
);
4796 _mesa_glsl_error(& loc
, state
,
4797 "invalid type in declaration of `%s'",
4803 if (this->type
->qualifier
.is_subroutine_decl()) {
4807 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4809 _mesa_glsl_error(& loc
, state
,
4810 "invalid type in declaration of `%s'",
4812 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4817 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4820 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4822 /* The 'varying in' and 'varying out' qualifiers can only be used with
4823 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4826 if (this->type
->qualifier
.flags
.q
.varying
) {
4827 if (this->type
->qualifier
.flags
.q
.in
) {
4828 _mesa_glsl_error(& loc
, state
,
4829 "`varying in' qualifier in declaration of "
4830 "`%s' only valid for geometry shaders using "
4831 "ARB_geometry_shader4 or EXT_geometry_shader4",
4833 } else if (this->type
->qualifier
.flags
.q
.out
) {
4834 _mesa_glsl_error(& loc
, state
,
4835 "`varying out' qualifier in declaration of "
4836 "`%s' only valid for geometry shaders using "
4837 "ARB_geometry_shader4 or EXT_geometry_shader4",
4842 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4844 * "Global variables can only use the qualifiers const,
4845 * attribute, uniform, or varying. Only one may be
4848 * Local variables can only use the qualifier const."
4850 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4851 * any extension that adds the 'layout' keyword.
4853 if (!state
->is_version(130, 300)
4854 && !state
->has_explicit_attrib_location()
4855 && !state
->has_separate_shader_objects()
4856 && !state
->ARB_fragment_coord_conventions_enable
) {
4857 if (this->type
->qualifier
.flags
.q
.out
) {
4858 _mesa_glsl_error(& loc
, state
,
4859 "`out' qualifier in declaration of `%s' "
4860 "only valid for function parameters in %s",
4861 decl
->identifier
, state
->get_version_string());
4863 if (this->type
->qualifier
.flags
.q
.in
) {
4864 _mesa_glsl_error(& loc
, state
,
4865 "`in' qualifier in declaration of `%s' "
4866 "only valid for function parameters in %s",
4867 decl
->identifier
, state
->get_version_string());
4869 /* FINISHME: Test for other invalid qualifiers. */
4872 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4874 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4877 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
4878 && (var
->type
->is_numeric() || var
->type
->is_boolean())
4879 && state
->zero_init
) {
4880 const ir_constant_data data
= { { 0 } };
4881 var
->data
.has_initializer
= true;
4882 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
4885 if (this->type
->qualifier
.flags
.q
.invariant
) {
4886 if (!is_allowed_invariant(var
, state
)) {
4887 _mesa_glsl_error(&loc
, state
,
4888 "`%s' cannot be marked invariant; interfaces between "
4889 "shader stages only", var
->name
);
4893 if (state
->current_function
!= NULL
) {
4894 const char *mode
= NULL
;
4895 const char *extra
= "";
4897 /* There is no need to check for 'inout' here because the parser will
4898 * only allow that in function parameter lists.
4900 if (this->type
->qualifier
.flags
.q
.attribute
) {
4902 } else if (this->type
->qualifier
.is_subroutine_decl()) {
4903 mode
= "subroutine uniform";
4904 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4906 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4908 } else if (this->type
->qualifier
.flags
.q
.in
) {
4910 extra
= " or in function parameter list";
4911 } else if (this->type
->qualifier
.flags
.q
.out
) {
4913 extra
= " or in function parameter list";
4917 _mesa_glsl_error(& loc
, state
,
4918 "%s variable `%s' must be declared at "
4920 mode
, var
->name
, extra
);
4922 } else if (var
->data
.mode
== ir_var_shader_in
) {
4923 var
->data
.read_only
= true;
4925 if (state
->stage
== MESA_SHADER_VERTEX
) {
4926 bool error_emitted
= false;
4928 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4930 * "Vertex shader inputs can only be float, floating-point
4931 * vectors, matrices, signed and unsigned integers and integer
4932 * vectors. Vertex shader inputs can also form arrays of these
4933 * types, but not structures."
4935 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4937 * "Vertex shader inputs can only be float, floating-point
4938 * vectors, matrices, signed and unsigned integers and integer
4939 * vectors. They cannot be arrays or structures."
4941 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4943 * "The attribute qualifier can be used only with float,
4944 * floating-point vectors, and matrices. Attribute variables
4945 * cannot be declared as arrays or structures."
4947 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4949 * "Vertex shader inputs can only be float, floating-point
4950 * vectors, matrices, signed and unsigned integers and integer
4951 * vectors. Vertex shader inputs cannot be arrays or
4954 const glsl_type
*check_type
= var
->type
->without_array();
4956 switch (check_type
->base_type
) {
4957 case GLSL_TYPE_FLOAT
:
4959 case GLSL_TYPE_UINT64
:
4960 case GLSL_TYPE_INT64
:
4962 case GLSL_TYPE_UINT
:
4964 if (state
->is_version(120, 300))
4966 case GLSL_TYPE_DOUBLE
:
4967 if (check_type
->is_double() && (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4971 _mesa_glsl_error(& loc
, state
,
4972 "vertex shader input / attribute cannot have "
4974 var
->type
->is_array() ? "array of " : "",
4976 error_emitted
= true;
4979 if (!error_emitted
&& var
->type
->is_array() &&
4980 !state
->check_version(150, 0, &loc
,
4981 "vertex shader input / attribute "
4982 "cannot have array type")) {
4983 error_emitted
= true;
4985 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4986 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4988 * Geometry shader input variables get the per-vertex values
4989 * written out by vertex shader output variables of the same
4990 * names. Since a geometry shader operates on a set of
4991 * vertices, each input varying variable (or input block, see
4992 * interface blocks below) needs to be declared as an array.
4994 if (!var
->type
->is_array()) {
4995 _mesa_glsl_error(&loc
, state
,
4996 "geometry shader inputs must be arrays");
4999 handle_geometry_shader_input_decl(state
, loc
, var
);
5000 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5001 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
5003 * It is a compile-time error to declare a fragment shader
5004 * input with, or that contains, any of the following types:
5008 * * An array of arrays
5009 * * An array of structures
5010 * * A structure containing an array
5011 * * A structure containing a structure
5013 if (state
->es_shader
) {
5014 const glsl_type
*check_type
= var
->type
->without_array();
5015 if (check_type
->is_boolean() ||
5016 check_type
->contains_opaque()) {
5017 _mesa_glsl_error(&loc
, state
,
5018 "fragment shader input cannot have type %s",
5021 if (var
->type
->is_array() &&
5022 var
->type
->fields
.array
->is_array()) {
5023 _mesa_glsl_error(&loc
, state
,
5025 "cannot have an array of arrays",
5026 _mesa_shader_stage_to_string(state
->stage
));
5028 if (var
->type
->is_array() &&
5029 var
->type
->fields
.array
->is_record()) {
5030 _mesa_glsl_error(&loc
, state
,
5031 "fragment shader input "
5032 "cannot have an array of structs");
5034 if (var
->type
->is_record()) {
5035 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5036 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5037 var
->type
->fields
.structure
[i
].type
->is_record())
5038 _mesa_glsl_error(&loc
, state
,
5039 "fragement shader input cannot have "
5040 "a struct that contains an "
5045 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5046 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5047 handle_tess_shader_input_decl(state
, loc
, var
);
5049 } else if (var
->data
.mode
== ir_var_shader_out
) {
5050 const glsl_type
*check_type
= var
->type
->without_array();
5052 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5054 * It is a compile-time error to declare a fragment shader output
5055 * that contains any of the following:
5057 * * A Boolean type (bool, bvec2 ...)
5058 * * A double-precision scalar or vector (double, dvec2 ...)
5063 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5064 if (check_type
->is_record() || check_type
->is_matrix())
5065 _mesa_glsl_error(&loc
, state
,
5066 "fragment shader output "
5067 "cannot have struct or matrix type");
5068 switch (check_type
->base_type
) {
5069 case GLSL_TYPE_UINT
:
5071 case GLSL_TYPE_FLOAT
:
5074 _mesa_glsl_error(&loc
, state
,
5075 "fragment shader output cannot have "
5076 "type %s", check_type
->name
);
5080 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5082 * It is a compile-time error to declare a vertex shader output
5083 * with, or that contains, any of the following types:
5087 * * An array of arrays
5088 * * An array of structures
5089 * * A structure containing an array
5090 * * A structure containing a structure
5092 * It is a compile-time error to declare a fragment shader output
5093 * with, or that contains, any of the following types:
5099 * * An array of array
5101 * ES 3.20 updates this to apply to tessellation and geometry shaders
5102 * as well. Because there are per-vertex arrays in the new stages,
5103 * it strikes the "array of..." rules and replaces them with these:
5105 * * For per-vertex-arrayed variables (applies to tessellation
5106 * control, tessellation evaluation and geometry shaders):
5108 * * Per-vertex-arrayed arrays of arrays
5109 * * Per-vertex-arrayed arrays of structures
5111 * * For non-per-vertex-arrayed variables:
5113 * * An array of arrays
5114 * * An array of structures
5116 * which basically says to unwrap the per-vertex aspect and apply
5119 if (state
->es_shader
) {
5120 if (var
->type
->is_array() &&
5121 var
->type
->fields
.array
->is_array()) {
5122 _mesa_glsl_error(&loc
, state
,
5124 "cannot have an array of arrays",
5125 _mesa_shader_stage_to_string(state
->stage
));
5127 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5128 const glsl_type
*type
= var
->type
;
5130 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5131 !var
->data
.patch
&& var
->type
->is_array()) {
5132 type
= var
->type
->fields
.array
;
5135 if (type
->is_array() && type
->fields
.array
->is_record()) {
5136 _mesa_glsl_error(&loc
, state
,
5137 "%s shader output cannot have "
5138 "an array of structs",
5139 _mesa_shader_stage_to_string(state
->stage
));
5141 if (type
->is_record()) {
5142 for (unsigned i
= 0; i
< type
->length
; i
++) {
5143 if (type
->fields
.structure
[i
].type
->is_array() ||
5144 type
->fields
.structure
[i
].type
->is_record())
5145 _mesa_glsl_error(&loc
, state
,
5146 "%s shader output cannot have a "
5147 "struct that contains an "
5149 _mesa_shader_stage_to_string(state
->stage
));
5155 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5156 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5158 } else if (var
->type
->contains_subroutine()) {
5159 /* declare subroutine uniforms as hidden */
5160 var
->data
.how_declared
= ir_var_hidden
;
5163 /* From section 4.3.4 of the GLSL 4.00 spec:
5164 * "Input variables may not be declared using the patch in qualifier
5165 * in tessellation control or geometry shaders."
5167 * From section 4.3.6 of the GLSL 4.00 spec:
5168 * "It is an error to use patch out in a vertex, tessellation
5169 * evaluation, or geometry shader."
5171 * This doesn't explicitly forbid using them in a fragment shader, but
5172 * that's probably just an oversight.
5174 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5175 && this->type
->qualifier
.flags
.q
.patch
5176 && this->type
->qualifier
.flags
.q
.in
) {
5178 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5179 "tessellation evaluation shader");
5182 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5183 && this->type
->qualifier
.flags
.q
.patch
5184 && this->type
->qualifier
.flags
.q
.out
) {
5186 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5187 "tessellation control shader");
5190 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5192 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5193 state
->check_precision_qualifiers_allowed(&loc
);
5196 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5197 !precision_qualifier_allowed(var
->type
)) {
5198 _mesa_glsl_error(&loc
, state
,
5199 "precision qualifiers apply only to floating point"
5200 ", integer and opaque types");
5203 /* From section 4.1.7 of the GLSL 4.40 spec:
5205 * "[Opaque types] can only be declared as function
5206 * parameters or uniform-qualified variables."
5208 if (var_type
->contains_opaque() &&
5209 !this->type
->qualifier
.flags
.q
.uniform
) {
5210 _mesa_glsl_error(&loc
, state
,
5211 "opaque variables must be declared uniform");
5214 /* Process the initializer and add its instructions to a temporary
5215 * list. This list will be added to the instruction stream (below) after
5216 * the declaration is added. This is done because in some cases (such as
5217 * redeclarations) the declaration may not actually be added to the
5218 * instruction stream.
5220 exec_list initializer_instructions
;
5222 /* Examine var name here since var may get deleted in the next call */
5223 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5225 bool is_redeclaration
;
5226 ir_variable
*declared_var
=
5227 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5228 false /* allow_all_redeclarations */,
5230 if (is_redeclaration
) {
5232 declared_var
->data
.how_declared
== ir_var_declared_in_block
) {
5233 _mesa_glsl_error(&loc
, state
,
5234 "`%s' has already been redeclared using "
5235 "gl_PerVertex", declared_var
->name
);
5237 declared_var
->data
.how_declared
= ir_var_declared_normally
;
5240 if (decl
->initializer
!= NULL
) {
5241 result
= process_initializer(declared_var
,
5243 &initializer_instructions
, state
);
5245 validate_array_dimensions(var_type
, state
, &loc
);
5248 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5250 * "It is an error to write to a const variable outside of
5251 * its declaration, so they must be initialized when
5254 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5255 _mesa_glsl_error(& loc
, state
,
5256 "const declaration of `%s' must be initialized",
5260 if (state
->es_shader
) {
5261 const glsl_type
*const t
= declared_var
->type
;
5263 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5265 * The GL_OES_tessellation_shader spec says about inputs:
5267 * "Declaring an array size is optional. If no size is specified,
5268 * it will be taken from the implementation-dependent maximum
5269 * patch size (gl_MaxPatchVertices)."
5271 * and about TCS outputs:
5273 * "If no size is specified, it will be taken from output patch
5274 * size declared in the shader."
5276 * The GL_OES_geometry_shader spec says:
5278 * "All geometry shader input unsized array declarations will be
5279 * sized by an earlier input primitive layout qualifier, when
5280 * present, as per the following table."
5282 const bool implicitly_sized
=
5283 (declared_var
->data
.mode
== ir_var_shader_in
&&
5284 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5285 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5286 (declared_var
->data
.mode
== ir_var_shader_out
&&
5287 state
->stage
== MESA_SHADER_TESS_CTRL
);
5289 if (t
->is_unsized_array() && !implicitly_sized
)
5290 /* Section 10.17 of the GLSL ES 1.00 specification states that
5291 * unsized array declarations have been removed from the language.
5292 * Arrays that are sized using an initializer are still explicitly
5293 * sized. However, GLSL ES 1.00 does not allow array
5294 * initializers. That is only allowed in GLSL ES 3.00.
5296 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5298 * "An array type can also be formed without specifying a size
5299 * if the definition includes an initializer:
5301 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5302 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5307 _mesa_glsl_error(& loc
, state
,
5308 "unsized array declarations are not allowed in "
5312 /* If the declaration is not a redeclaration, there are a few additional
5313 * semantic checks that must be applied. In addition, variable that was
5314 * created for the declaration should be added to the IR stream.
5316 if (!is_redeclaration
) {
5317 validate_identifier(decl
->identifier
, loc
, state
);
5319 /* Add the variable to the symbol table. Note that the initializer's
5320 * IR was already processed earlier (though it hasn't been emitted
5321 * yet), without the variable in scope.
5323 * This differs from most C-like languages, but it follows the GLSL
5324 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5327 * "Within a declaration, the scope of a name starts immediately
5328 * after the initializer if present or immediately after the name
5329 * being declared if not."
5331 if (!state
->symbols
->add_variable(declared_var
)) {
5332 YYLTYPE loc
= this->get_location();
5333 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5334 "current scope", decl
->identifier
);
5338 /* Push the variable declaration to the top. It means that all the
5339 * variable declarations will appear in a funny last-to-first order,
5340 * but otherwise we run into trouble if a function is prototyped, a
5341 * global var is decled, then the function is defined with usage of
5342 * the global var. See glslparsertest's CorrectModule.frag.
5344 instructions
->push_head(declared_var
);
5347 instructions
->append_list(&initializer_instructions
);
5351 /* Generally, variable declarations do not have r-values. However,
5352 * one is used for the declaration in
5354 * while (bool b = some_condition()) {
5358 * so we return the rvalue from the last seen declaration here.
5365 ast_parameter_declarator::hir(exec_list
*instructions
,
5366 struct _mesa_glsl_parse_state
*state
)
5369 const struct glsl_type
*type
;
5370 const char *name
= NULL
;
5371 YYLTYPE loc
= this->get_location();
5373 type
= this->type
->glsl_type(& name
, state
);
5377 _mesa_glsl_error(& loc
, state
,
5378 "invalid type `%s' in declaration of `%s'",
5379 name
, this->identifier
);
5381 _mesa_glsl_error(& loc
, state
,
5382 "invalid type in declaration of `%s'",
5386 type
= glsl_type::error_type
;
5389 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5391 * "Functions that accept no input arguments need not use void in the
5392 * argument list because prototypes (or definitions) are required and
5393 * therefore there is no ambiguity when an empty argument list "( )" is
5394 * declared. The idiom "(void)" as a parameter list is provided for
5397 * Placing this check here prevents a void parameter being set up
5398 * for a function, which avoids tripping up checks for main taking
5399 * parameters and lookups of an unnamed symbol.
5401 if (type
->is_void()) {
5402 if (this->identifier
!= NULL
)
5403 _mesa_glsl_error(& loc
, state
,
5404 "named parameter cannot have type `void'");
5410 if (formal_parameter
&& (this->identifier
== NULL
)) {
5411 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5415 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5416 * call already handled the "vec4[..] foo" case.
5418 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5420 if (!type
->is_error() && type
->is_unsized_array()) {
5421 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5423 type
= glsl_type::error_type
;
5427 ir_variable
*var
= new(ctx
)
5428 ir_variable(type
, this->identifier
, ir_var_function_in
);
5430 /* Apply any specified qualifiers to the parameter declaration. Note that
5431 * for function parameters the default mode is 'in'.
5433 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5436 /* From section 4.1.7 of the GLSL 4.40 spec:
5438 * "Opaque variables cannot be treated as l-values; hence cannot
5439 * be used as out or inout function parameters, nor can they be
5442 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5443 && type
->contains_opaque()) {
5444 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5445 "contain opaque variables");
5446 type
= glsl_type::error_type
;
5449 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5451 * "When calling a function, expressions that do not evaluate to
5452 * l-values cannot be passed to parameters declared as out or inout."
5454 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5456 * "Other binary or unary expressions, non-dereferenced arrays,
5457 * function names, swizzles with repeated fields, and constants
5458 * cannot be l-values."
5460 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5461 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5463 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5465 && !state
->check_version(120, 100, &loc
,
5466 "arrays cannot be out or inout parameters")) {
5467 type
= glsl_type::error_type
;
5470 instructions
->push_tail(var
);
5472 /* Parameter declarations do not have r-values.
5479 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5481 exec_list
*ir_parameters
,
5482 _mesa_glsl_parse_state
*state
)
5484 ast_parameter_declarator
*void_param
= NULL
;
5487 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5488 param
->formal_parameter
= formal
;
5489 param
->hir(ir_parameters
, state
);
5497 if ((void_param
!= NULL
) && (count
> 1)) {
5498 YYLTYPE loc
= void_param
->get_location();
5500 _mesa_glsl_error(& loc
, state
,
5501 "`void' parameter must be only parameter");
5507 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5509 /* IR invariants disallow function declarations or definitions
5510 * nested within other function definitions. But there is no
5511 * requirement about the relative order of function declarations
5512 * and definitions with respect to one another. So simply insert
5513 * the new ir_function block at the end of the toplevel instruction
5516 state
->toplevel_ir
->push_tail(f
);
5521 ast_function::hir(exec_list
*instructions
,
5522 struct _mesa_glsl_parse_state
*state
)
5525 ir_function
*f
= NULL
;
5526 ir_function_signature
*sig
= NULL
;
5527 exec_list hir_parameters
;
5528 YYLTYPE loc
= this->get_location();
5530 const char *const name
= identifier
;
5532 /* New functions are always added to the top-level IR instruction stream,
5533 * so this instruction list pointer is ignored. See also emit_function
5536 (void) instructions
;
5538 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5540 * "Function declarations (prototypes) cannot occur inside of functions;
5541 * they must be at global scope, or for the built-in functions, outside
5542 * the global scope."
5544 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5546 * "User defined functions may only be defined within the global scope."
5548 * Note that this language does not appear in GLSL 1.10.
5550 if ((state
->current_function
!= NULL
) &&
5551 state
->is_version(120, 100)) {
5552 YYLTYPE loc
= this->get_location();
5553 _mesa_glsl_error(&loc
, state
,
5554 "declaration of function `%s' not allowed within "
5555 "function body", name
);
5558 validate_identifier(name
, this->get_location(), state
);
5560 /* Convert the list of function parameters to HIR now so that they can be
5561 * used below to compare this function's signature with previously seen
5562 * signatures for functions with the same name.
5564 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5566 & hir_parameters
, state
);
5568 const char *return_type_name
;
5569 const glsl_type
*return_type
=
5570 this->return_type
->glsl_type(& return_type_name
, state
);
5573 YYLTYPE loc
= this->get_location();
5574 _mesa_glsl_error(&loc
, state
,
5575 "function `%s' has undeclared return type `%s'",
5576 name
, return_type_name
);
5577 return_type
= glsl_type::error_type
;
5580 /* ARB_shader_subroutine states:
5581 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5582 * subroutine(...) to a function declaration."
5584 if (this->return_type
->qualifier
.subroutine_list
&& !is_definition
) {
5585 YYLTYPE loc
= this->get_location();
5586 _mesa_glsl_error(&loc
, state
,
5587 "function declaration `%s' cannot have subroutine prepended",
5591 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5592 * "No qualifier is allowed on the return type of a function."
5594 if (this->return_type
->has_qualifiers(state
)) {
5595 YYLTYPE loc
= this->get_location();
5596 _mesa_glsl_error(& loc
, state
,
5597 "function `%s' return type has qualifiers", name
);
5600 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5602 * "Arrays are allowed as arguments and as the return type. In both
5603 * cases, the array must be explicitly sized."
5605 if (return_type
->is_unsized_array()) {
5606 YYLTYPE loc
= this->get_location();
5607 _mesa_glsl_error(& loc
, state
,
5608 "function `%s' return type array must be explicitly "
5612 /* From section 4.1.7 of the GLSL 4.40 spec:
5614 * "[Opaque types] can only be declared as function parameters
5615 * or uniform-qualified variables."
5617 if (return_type
->contains_opaque()) {
5618 YYLTYPE loc
= this->get_location();
5619 _mesa_glsl_error(&loc
, state
,
5620 "function `%s' return type can't contain an opaque type",
5625 if (return_type
->is_subroutine()) {
5626 YYLTYPE loc
= this->get_location();
5627 _mesa_glsl_error(&loc
, state
,
5628 "function `%s' return type can't be a subroutine type",
5633 /* Create an ir_function if one doesn't already exist. */
5634 f
= state
->symbols
->get_function(name
);
5636 f
= new(ctx
) ir_function(name
);
5637 if (!this->return_type
->qualifier
.is_subroutine_decl()) {
5638 if (!state
->symbols
->add_function(f
)) {
5639 /* This function name shadows a non-function use of the same name. */
5640 YYLTYPE loc
= this->get_location();
5641 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5642 "non-function", name
);
5646 emit_function(state
, f
);
5649 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5651 * "A shader cannot redefine or overload built-in functions."
5653 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5655 * "User code can overload the built-in functions but cannot redefine
5658 if (state
->es_shader
&& state
->language_version
>= 300) {
5659 /* Local shader has no exact candidates; check the built-ins. */
5660 _mesa_glsl_initialize_builtin_functions();
5661 if (_mesa_glsl_has_builtin_function(name
)) {
5662 YYLTYPE loc
= this->get_location();
5663 _mesa_glsl_error(& loc
, state
,
5664 "A shader cannot redefine or overload built-in "
5665 "function `%s' in GLSL ES 3.00", name
);
5670 /* Verify that this function's signature either doesn't match a previously
5671 * seen signature for a function with the same name, or, if a match is found,
5672 * that the previously seen signature does not have an associated definition.
5674 if (state
->es_shader
|| f
->has_user_signature()) {
5675 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5677 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5678 if (badvar
!= NULL
) {
5679 YYLTYPE loc
= this->get_location();
5681 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5682 "qualifiers don't match prototype", name
, badvar
);
5685 if (sig
->return_type
!= return_type
) {
5686 YYLTYPE loc
= this->get_location();
5688 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5689 "match prototype", name
);
5692 if (sig
->is_defined
) {
5693 if (is_definition
) {
5694 YYLTYPE loc
= this->get_location();
5695 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5697 /* We just encountered a prototype that exactly matches a
5698 * function that's already been defined. This is redundant,
5699 * and we should ignore it.
5707 /* Verify the return type of main() */
5708 if (strcmp(name
, "main") == 0) {
5709 if (! return_type
->is_void()) {
5710 YYLTYPE loc
= this->get_location();
5712 _mesa_glsl_error(& loc
, state
, "main() must return void");
5715 if (!hir_parameters
.is_empty()) {
5716 YYLTYPE loc
= this->get_location();
5718 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5722 /* Finish storing the information about this new function in its signature.
5725 sig
= new(ctx
) ir_function_signature(return_type
);
5726 f
->add_signature(sig
);
5729 sig
->replace_parameters(&hir_parameters
);
5732 if (this->return_type
->qualifier
.subroutine_list
) {
5735 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5736 unsigned qual_index
;
5737 if (process_qualifier_constant(state
, &loc
, "index",
5738 this->return_type
->qualifier
.index
,
5740 if (!state
->has_explicit_uniform_location()) {
5741 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5742 "GL_ARB_explicit_uniform_location or "
5744 } else if (qual_index
>= MAX_SUBROUTINES
) {
5745 _mesa_glsl_error(&loc
, state
,
5746 "invalid subroutine index (%d) index must "
5747 "be a number between 0 and "
5748 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5749 MAX_SUBROUTINES
- 1);
5751 f
->subroutine_index
= qual_index
;
5756 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5757 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5758 f
->num_subroutine_types
);
5760 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5761 const struct glsl_type
*type
;
5762 /* the subroutine type must be already declared */
5763 type
= state
->symbols
->get_type(decl
->identifier
);
5765 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5768 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5769 ir_function
*fn
= state
->subroutine_types
[i
];
5770 ir_function_signature
*tsig
= NULL
;
5772 if (strcmp(fn
->name
, decl
->identifier
))
5775 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5778 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5780 if (tsig
->return_type
!= sig
->return_type
) {
5781 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5785 f
->subroutine_types
[idx
++] = type
;
5787 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5789 state
->num_subroutines
+ 1);
5790 state
->subroutines
[state
->num_subroutines
] = f
;
5791 state
->num_subroutines
++;
5795 if (this->return_type
->qualifier
.is_subroutine_decl()) {
5796 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5797 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5800 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5802 state
->num_subroutine_types
+ 1);
5803 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5804 state
->num_subroutine_types
++;
5806 f
->is_subroutine
= true;
5809 /* Function declarations (prototypes) do not have r-values.
5816 ast_function_definition::hir(exec_list
*instructions
,
5817 struct _mesa_glsl_parse_state
*state
)
5819 prototype
->is_definition
= true;
5820 prototype
->hir(instructions
, state
);
5822 ir_function_signature
*signature
= prototype
->signature
;
5823 if (signature
== NULL
)
5826 assert(state
->current_function
== NULL
);
5827 state
->current_function
= signature
;
5828 state
->found_return
= false;
5830 /* Duplicate parameters declared in the prototype as concrete variables.
5831 * Add these to the symbol table.
5833 state
->symbols
->push_scope();
5834 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5835 assert(var
->as_variable() != NULL
);
5837 /* The only way a parameter would "exist" is if two parameters have
5840 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5841 YYLTYPE loc
= this->get_location();
5843 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5845 state
->symbols
->add_variable(var
);
5849 /* Convert the body of the function to HIR. */
5850 this->body
->hir(&signature
->body
, state
);
5851 signature
->is_defined
= true;
5853 state
->symbols
->pop_scope();
5855 assert(state
->current_function
== signature
);
5856 state
->current_function
= NULL
;
5858 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5859 YYLTYPE loc
= this->get_location();
5860 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5861 "%s, but no return statement",
5862 signature
->function_name(),
5863 signature
->return_type
->name
);
5866 /* Function definitions do not have r-values.
5873 ast_jump_statement::hir(exec_list
*instructions
,
5874 struct _mesa_glsl_parse_state
*state
)
5881 assert(state
->current_function
);
5883 if (opt_return_value
) {
5884 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5886 /* The value of the return type can be NULL if the shader says
5887 * 'return foo();' and foo() is a function that returns void.
5889 * NOTE: The GLSL spec doesn't say that this is an error. The type
5890 * of the return value is void. If the return type of the function is
5891 * also void, then this should compile without error. Seriously.
5893 const glsl_type
*const ret_type
=
5894 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5896 /* Implicit conversions are not allowed for return values prior to
5897 * ARB_shading_language_420pack.
5899 if (state
->current_function
->return_type
!= ret_type
) {
5900 YYLTYPE loc
= this->get_location();
5902 if (state
->has_420pack()) {
5903 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5905 _mesa_glsl_error(& loc
, state
,
5906 "could not implicitly convert return value "
5907 "to %s, in function `%s'",
5908 state
->current_function
->return_type
->name
,
5909 state
->current_function
->function_name());
5912 _mesa_glsl_error(& loc
, state
,
5913 "`return' with wrong type %s, in function `%s' "
5916 state
->current_function
->function_name(),
5917 state
->current_function
->return_type
->name
);
5919 } else if (state
->current_function
->return_type
->base_type
==
5921 YYLTYPE loc
= this->get_location();
5923 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5924 * specs add a clarification:
5926 * "A void function can only use return without a return argument, even if
5927 * the return argument has void type. Return statements only accept values:
5930 * void func2() { return func1(); } // illegal return statement"
5932 _mesa_glsl_error(& loc
, state
,
5933 "void functions can only use `return' without a "
5937 inst
= new(ctx
) ir_return(ret
);
5939 if (state
->current_function
->return_type
->base_type
!=
5941 YYLTYPE loc
= this->get_location();
5943 _mesa_glsl_error(& loc
, state
,
5944 "`return' with no value, in function %s returning "
5946 state
->current_function
->function_name());
5948 inst
= new(ctx
) ir_return
;
5951 state
->found_return
= true;
5952 instructions
->push_tail(inst
);
5957 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5958 YYLTYPE loc
= this->get_location();
5960 _mesa_glsl_error(& loc
, state
,
5961 "`discard' may only appear in a fragment shader");
5963 instructions
->push_tail(new(ctx
) ir_discard
);
5968 if (mode
== ast_continue
&&
5969 state
->loop_nesting_ast
== NULL
) {
5970 YYLTYPE loc
= this->get_location();
5972 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5973 } else if (mode
== ast_break
&&
5974 state
->loop_nesting_ast
== NULL
&&
5975 state
->switch_state
.switch_nesting_ast
== NULL
) {
5976 YYLTYPE loc
= this->get_location();
5978 _mesa_glsl_error(& loc
, state
,
5979 "break may only appear in a loop or a switch");
5981 /* For a loop, inline the for loop expression again, since we don't
5982 * know where near the end of the loop body the normal copy of it is
5983 * going to be placed. Same goes for the condition for a do-while
5986 if (state
->loop_nesting_ast
!= NULL
&&
5987 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5988 if (state
->loop_nesting_ast
->rest_expression
) {
5989 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5992 if (state
->loop_nesting_ast
->mode
==
5993 ast_iteration_statement::ast_do_while
) {
5994 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5998 if (state
->switch_state
.is_switch_innermost
&&
5999 mode
== ast_continue
) {
6000 /* Set 'continue_inside' to true. */
6001 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
6002 ir_dereference_variable
*deref_continue_inside_var
=
6003 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6004 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6007 /* Break out from the switch, continue for the loop will
6008 * be called right after switch. */
6009 ir_loop_jump
*const jump
=
6010 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6011 instructions
->push_tail(jump
);
6013 } else if (state
->switch_state
.is_switch_innermost
&&
6014 mode
== ast_break
) {
6015 /* Force break out of switch by inserting a break. */
6016 ir_loop_jump
*const jump
=
6017 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6018 instructions
->push_tail(jump
);
6020 ir_loop_jump
*const jump
=
6021 new(ctx
) ir_loop_jump((mode
== ast_break
)
6022 ? ir_loop_jump::jump_break
6023 : ir_loop_jump::jump_continue
);
6024 instructions
->push_tail(jump
);
6031 /* Jump instructions do not have r-values.
6038 ast_selection_statement::hir(exec_list
*instructions
,
6039 struct _mesa_glsl_parse_state
*state
)
6043 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6045 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6047 * "Any expression whose type evaluates to a Boolean can be used as the
6048 * conditional expression bool-expression. Vector types are not accepted
6049 * as the expression to if."
6051 * The checks are separated so that higher quality diagnostics can be
6052 * generated for cases where both rules are violated.
6054 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6055 YYLTYPE loc
= this->condition
->get_location();
6057 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6061 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6063 if (then_statement
!= NULL
) {
6064 state
->symbols
->push_scope();
6065 then_statement
->hir(& stmt
->then_instructions
, state
);
6066 state
->symbols
->pop_scope();
6069 if (else_statement
!= NULL
) {
6070 state
->symbols
->push_scope();
6071 else_statement
->hir(& stmt
->else_instructions
, state
);
6072 state
->symbols
->pop_scope();
6075 instructions
->push_tail(stmt
);
6077 /* if-statements do not have r-values.
6083 /* Used for detection of duplicate case values, compare
6084 * given contents directly.
6087 compare_case_value(const void *a
, const void *b
)
6089 return *(unsigned *) a
== *(unsigned *) b
;
6093 /* Used for detection of duplicate case values, just
6094 * returns key contents as is.
6097 key_contents(const void *key
)
6099 return *(unsigned *) key
;
6104 ast_switch_statement::hir(exec_list
*instructions
,
6105 struct _mesa_glsl_parse_state
*state
)
6109 ir_rvalue
*const test_expression
=
6110 this->test_expression
->hir(instructions
, state
);
6112 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6114 * "The type of init-expression in a switch statement must be a
6117 if (!test_expression
->type
->is_scalar() ||
6118 !test_expression
->type
->is_integer()) {
6119 YYLTYPE loc
= this->test_expression
->get_location();
6121 _mesa_glsl_error(& loc
,
6123 "switch-statement expression must be scalar "
6127 /* Track the switch-statement nesting in a stack-like manner.
6129 struct glsl_switch_state saved
= state
->switch_state
;
6131 state
->switch_state
.is_switch_innermost
= true;
6132 state
->switch_state
.switch_nesting_ast
= this;
6133 state
->switch_state
.labels_ht
=
6134 _mesa_hash_table_create(NULL
, key_contents
,
6135 compare_case_value
);
6136 state
->switch_state
.previous_default
= NULL
;
6138 /* Initalize is_fallthru state to false.
6140 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6141 state
->switch_state
.is_fallthru_var
=
6142 new(ctx
) ir_variable(glsl_type::bool_type
,
6143 "switch_is_fallthru_tmp",
6145 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6147 ir_dereference_variable
*deref_is_fallthru_var
=
6148 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6149 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6152 /* Initialize continue_inside state to false.
6154 state
->switch_state
.continue_inside
=
6155 new(ctx
) ir_variable(glsl_type::bool_type
,
6156 "continue_inside_tmp",
6158 instructions
->push_tail(state
->switch_state
.continue_inside
);
6160 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6161 ir_dereference_variable
*deref_continue_inside_var
=
6162 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6163 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6166 state
->switch_state
.run_default
=
6167 new(ctx
) ir_variable(glsl_type::bool_type
,
6170 instructions
->push_tail(state
->switch_state
.run_default
);
6172 /* Loop around the switch is used for flow control. */
6173 ir_loop
* loop
= new(ctx
) ir_loop();
6174 instructions
->push_tail(loop
);
6176 /* Cache test expression.
6178 test_to_hir(&loop
->body_instructions
, state
);
6180 /* Emit code for body of switch stmt.
6182 body
->hir(&loop
->body_instructions
, state
);
6184 /* Insert a break at the end to exit loop. */
6185 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6186 loop
->body_instructions
.push_tail(jump
);
6188 /* If we are inside loop, check if continue got called inside switch. */
6189 if (state
->loop_nesting_ast
!= NULL
) {
6190 ir_dereference_variable
*deref_continue_inside
=
6191 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6192 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6193 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6195 if (state
->loop_nesting_ast
!= NULL
) {
6196 if (state
->loop_nesting_ast
->rest_expression
) {
6197 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6200 if (state
->loop_nesting_ast
->mode
==
6201 ast_iteration_statement::ast_do_while
) {
6202 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6205 irif
->then_instructions
.push_tail(jump
);
6206 instructions
->push_tail(irif
);
6209 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6211 state
->switch_state
= saved
;
6213 /* Switch statements do not have r-values. */
6219 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6220 struct _mesa_glsl_parse_state
*state
)
6224 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6225 * on the switch test case. The first one would be already raised when
6226 * getting the test_expression at ast_switch_statement::hir
6228 test_expression
->set_is_lhs(true);
6229 /* Cache value of test expression. */
6230 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6232 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6235 ir_dereference_variable
*deref_test_var
=
6236 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6238 instructions
->push_tail(state
->switch_state
.test_var
);
6239 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6244 ast_switch_body::hir(exec_list
*instructions
,
6245 struct _mesa_glsl_parse_state
*state
)
6248 stmts
->hir(instructions
, state
);
6250 /* Switch bodies do not have r-values. */
6255 ast_case_statement_list::hir(exec_list
*instructions
,
6256 struct _mesa_glsl_parse_state
*state
)
6258 exec_list default_case
, after_default
, tmp
;
6260 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6261 case_stmt
->hir(&tmp
, state
);
6264 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6265 default_case
.append_list(&tmp
);
6269 /* If default case found, append 'after_default' list. */
6270 if (!default_case
.is_empty())
6271 after_default
.append_list(&tmp
);
6273 instructions
->append_list(&tmp
);
6276 /* Handle the default case. This is done here because default might not be
6277 * the last case. We need to add checks against following cases first to see
6278 * if default should be chosen or not.
6280 if (!default_case
.is_empty()) {
6282 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6283 ir_dereference_variable
*deref_run_default_var
=
6284 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6286 /* Choose to run default case initially, following conditional
6287 * assignments might change this.
6289 ir_assignment
*const init_var
=
6290 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6291 instructions
->push_tail(init_var
);
6293 /* Default case was the last one, no checks required. */
6294 if (after_default
.is_empty()) {
6295 instructions
->append_list(&default_case
);
6299 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6300 ir_assignment
*assign
= ir
->as_assignment();
6305 /* Clone the check between case label and init expression. */
6306 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6307 ir_expression
*clone
= exp
->clone(state
, NULL
);
6309 ir_dereference_variable
*deref_var
=
6310 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6311 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6313 ir_assignment
*const set_false
=
6314 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6316 instructions
->push_tail(set_false
);
6319 /* Append default case and all cases after it. */
6320 instructions
->append_list(&default_case
);
6321 instructions
->append_list(&after_default
);
6324 /* Case statements do not have r-values. */
6329 ast_case_statement::hir(exec_list
*instructions
,
6330 struct _mesa_glsl_parse_state
*state
)
6332 labels
->hir(instructions
, state
);
6334 /* Guard case statements depending on fallthru state. */
6335 ir_dereference_variable
*const deref_fallthru_guard
=
6336 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6337 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6339 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6340 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6342 instructions
->push_tail(test_fallthru
);
6344 /* Case statements do not have r-values. */
6350 ast_case_label_list::hir(exec_list
*instructions
,
6351 struct _mesa_glsl_parse_state
*state
)
6353 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6354 label
->hir(instructions
, state
);
6356 /* Case labels do not have r-values. */
6361 ast_case_label::hir(exec_list
*instructions
,
6362 struct _mesa_glsl_parse_state
*state
)
6366 ir_dereference_variable
*deref_fallthru_var
=
6367 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6369 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6371 /* If not default case, ... */
6372 if (this->test_value
!= NULL
) {
6373 /* Conditionally set fallthru state based on
6374 * comparison of cached test expression value to case label.
6376 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6377 ir_constant
*label_const
= label_rval
->constant_expression_value();
6380 YYLTYPE loc
= this->test_value
->get_location();
6382 _mesa_glsl_error(& loc
, state
,
6383 "switch statement case label must be a "
6384 "constant expression");
6386 /* Stuff a dummy value in to allow processing to continue. */
6387 label_const
= new(ctx
) ir_constant(0);
6390 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6391 (void *)(uintptr_t)&label_const
->value
.u
[0]);
6394 ast_expression
*previous_label
= (ast_expression
*) entry
->data
;
6395 YYLTYPE loc
= this->test_value
->get_location();
6396 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6398 loc
= previous_label
->get_location();
6399 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6401 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6402 (void *)(uintptr_t)&label_const
->value
.u
[0],
6407 ir_dereference_variable
*deref_test_var
=
6408 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6410 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6415 * From GLSL 4.40 specification section 6.2 ("Selection"):
6417 * "The type of the init-expression value in a switch statement must
6418 * be a scalar int or uint. The type of the constant-expression value
6419 * in a case label also must be a scalar int or uint. When any pair
6420 * of these values is tested for "equal value" and the types do not
6421 * match, an implicit conversion will be done to convert the int to a
6422 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6425 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6426 YYLTYPE loc
= this->test_value
->get_location();
6428 const glsl_type
*type_a
= label_const
->type
;
6429 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6431 /* Check if int->uint implicit conversion is supported. */
6432 bool integer_conversion_supported
=
6433 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6436 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6437 !integer_conversion_supported
) {
6438 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6439 "init-expression and case label (%s != %s)",
6440 type_a
->name
, type_b
->name
);
6442 /* Conversion of the case label. */
6443 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6444 if (!apply_implicit_conversion(glsl_type::uint_type
,
6445 test_cond
->operands
[0], state
))
6446 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6448 /* Conversion of the init-expression value. */
6449 if (!apply_implicit_conversion(glsl_type::uint_type
,
6450 test_cond
->operands
[1], state
))
6451 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6456 ir_assignment
*set_fallthru_on_test
=
6457 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6459 instructions
->push_tail(set_fallthru_on_test
);
6460 } else { /* default case */
6461 if (state
->switch_state
.previous_default
) {
6462 YYLTYPE loc
= this->get_location();
6463 _mesa_glsl_error(& loc
, state
,
6464 "multiple default labels in one switch");
6466 loc
= state
->switch_state
.previous_default
->get_location();
6467 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6469 state
->switch_state
.previous_default
= this;
6471 /* Set fallthru condition on 'run_default' bool. */
6472 ir_dereference_variable
*deref_run_default
=
6473 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6474 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6475 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6479 /* Set falltrhu state. */
6480 ir_assignment
*set_fallthru
=
6481 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6483 instructions
->push_tail(set_fallthru
);
6486 /* Case statements do not have r-values. */
6491 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6492 struct _mesa_glsl_parse_state
*state
)
6496 if (condition
!= NULL
) {
6497 ir_rvalue
*const cond
=
6498 condition
->hir(instructions
, state
);
6501 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6502 YYLTYPE loc
= condition
->get_location();
6504 _mesa_glsl_error(& loc
, state
,
6505 "loop condition must be scalar boolean");
6507 /* As the first code in the loop body, generate a block that looks
6508 * like 'if (!condition) break;' as the loop termination condition.
6510 ir_rvalue
*const not_cond
=
6511 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6513 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6515 ir_jump
*const break_stmt
=
6516 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6518 if_stmt
->then_instructions
.push_tail(break_stmt
);
6519 instructions
->push_tail(if_stmt
);
6526 ast_iteration_statement::hir(exec_list
*instructions
,
6527 struct _mesa_glsl_parse_state
*state
)
6531 /* For-loops and while-loops start a new scope, but do-while loops do not.
6533 if (mode
!= ast_do_while
)
6534 state
->symbols
->push_scope();
6536 if (init_statement
!= NULL
)
6537 init_statement
->hir(instructions
, state
);
6539 ir_loop
*const stmt
= new(ctx
) ir_loop();
6540 instructions
->push_tail(stmt
);
6542 /* Track the current loop nesting. */
6543 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6545 state
->loop_nesting_ast
= this;
6547 /* Likewise, indicate that following code is closest to a loop,
6548 * NOT closest to a switch.
6550 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6551 state
->switch_state
.is_switch_innermost
= false;
6553 if (mode
!= ast_do_while
)
6554 condition_to_hir(&stmt
->body_instructions
, state
);
6557 body
->hir(& stmt
->body_instructions
, state
);
6559 if (rest_expression
!= NULL
)
6560 rest_expression
->hir(& stmt
->body_instructions
, state
);
6562 if (mode
== ast_do_while
)
6563 condition_to_hir(&stmt
->body_instructions
, state
);
6565 if (mode
!= ast_do_while
)
6566 state
->symbols
->pop_scope();
6568 /* Restore previous nesting before returning. */
6569 state
->loop_nesting_ast
= nesting_ast
;
6570 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6572 /* Loops do not have r-values.
6579 * Determine if the given type is valid for establishing a default precision
6582 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6584 * "The precision statement
6586 * precision precision-qualifier type;
6588 * can be used to establish a default precision qualifier. The type field
6589 * can be either int or float or any of the sampler types, and the
6590 * precision-qualifier can be lowp, mediump, or highp."
6592 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6593 * qualifiers on sampler types, but this seems like an oversight (since the
6594 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6595 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6599 is_valid_default_precision_type(const struct glsl_type
*const type
)
6604 switch (type
->base_type
) {
6606 case GLSL_TYPE_FLOAT
:
6607 /* "int" and "float" are valid, but vectors and matrices are not. */
6608 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6609 case GLSL_TYPE_SAMPLER
:
6610 case GLSL_TYPE_IMAGE
:
6611 case GLSL_TYPE_ATOMIC_UINT
:
6620 ast_type_specifier::hir(exec_list
*instructions
,
6621 struct _mesa_glsl_parse_state
*state
)
6623 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6626 YYLTYPE loc
= this->get_location();
6628 /* If this is a precision statement, check that the type to which it is
6629 * applied is either float or int.
6631 * From section 4.5.3 of the GLSL 1.30 spec:
6632 * "The precision statement
6633 * precision precision-qualifier type;
6634 * can be used to establish a default precision qualifier. The type
6635 * field can be either int or float [...]. Any other types or
6636 * qualifiers will result in an error.
6638 if (this->default_precision
!= ast_precision_none
) {
6639 if (!state
->check_precision_qualifiers_allowed(&loc
))
6642 if (this->structure
!= NULL
) {
6643 _mesa_glsl_error(&loc
, state
,
6644 "precision qualifiers do not apply to structures");
6648 if (this->array_specifier
!= NULL
) {
6649 _mesa_glsl_error(&loc
, state
,
6650 "default precision statements do not apply to "
6655 const struct glsl_type
*const type
=
6656 state
->symbols
->get_type(this->type_name
);
6657 if (!is_valid_default_precision_type(type
)) {
6658 _mesa_glsl_error(&loc
, state
,
6659 "default precision statements apply only to "
6660 "float, int, and opaque types");
6664 if (state
->es_shader
) {
6665 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6668 * "Non-precision qualified declarations will use the precision
6669 * qualifier specified in the most recent precision statement
6670 * that is still in scope. The precision statement has the same
6671 * scoping rules as variable declarations. If it is declared
6672 * inside a compound statement, its effect stops at the end of
6673 * the innermost statement it was declared in. Precision
6674 * statements in nested scopes override precision statements in
6675 * outer scopes. Multiple precision statements for the same basic
6676 * type can appear inside the same scope, with later statements
6677 * overriding earlier statements within that scope."
6679 * Default precision specifications follow the same scope rules as
6680 * variables. So, we can track the state of the default precision
6681 * qualifiers in the symbol table, and the rules will just work. This
6682 * is a slight abuse of the symbol table, but it has the semantics
6685 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6686 this->default_precision
);
6689 /* FINISHME: Translate precision statements into IR. */
6693 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6694 * process_record_constructor() can do type-checking on C-style initializer
6695 * expressions of structs, but ast_struct_specifier should only be translated
6696 * to HIR if it is declaring the type of a structure.
6698 * The ->is_declaration field is false for initializers of variables
6699 * declared separately from the struct's type definition.
6701 * struct S { ... }; (is_declaration = true)
6702 * struct T { ... } t = { ... }; (is_declaration = true)
6703 * S s = { ... }; (is_declaration = false)
6705 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6706 return this->structure
->hir(instructions
, state
);
6713 * Process a structure or interface block tree into an array of structure fields
6715 * After parsing, where there are some syntax differnces, structures and
6716 * interface blocks are almost identical. They are similar enough that the
6717 * AST for each can be processed the same way into a set of
6718 * \c glsl_struct_field to describe the members.
6720 * If we're processing an interface block, var_mode should be the type of the
6721 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6722 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6726 * The number of fields processed. A pointer to the array structure fields is
6727 * stored in \c *fields_ret.
6730 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6731 struct _mesa_glsl_parse_state
*state
,
6732 exec_list
*declarations
,
6733 glsl_struct_field
**fields_ret
,
6735 enum glsl_matrix_layout matrix_layout
,
6736 bool allow_reserved_names
,
6737 ir_variable_mode var_mode
,
6738 ast_type_qualifier
*layout
,
6739 unsigned block_stream
,
6740 unsigned block_xfb_buffer
,
6741 unsigned block_xfb_offset
,
6742 unsigned expl_location
,
6743 unsigned expl_align
)
6745 unsigned decl_count
= 0;
6746 unsigned next_offset
= 0;
6748 /* Make an initial pass over the list of fields to determine how
6749 * many there are. Each element in this list is an ast_declarator_list.
6750 * This means that we actually need to count the number of elements in the
6751 * 'declarations' list in each of the elements.
6753 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6754 decl_count
+= decl_list
->declarations
.length();
6757 /* Allocate storage for the fields and process the field
6758 * declarations. As the declarations are processed, try to also convert
6759 * the types to HIR. This ensures that structure definitions embedded in
6760 * other structure definitions or in interface blocks are processed.
6762 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
6765 bool first_member
= true;
6766 bool first_member_has_explicit_location
= false;
6769 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6770 const char *type_name
;
6771 YYLTYPE loc
= decl_list
->get_location();
6773 decl_list
->type
->specifier
->hir(instructions
, state
);
6775 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6777 * "Anonymous structures are not supported; so embedded structures
6778 * must have a declarator. A name given to an embedded struct is
6779 * scoped at the same level as the struct it is embedded in."
6781 * The same section of the GLSL 1.20 spec says:
6783 * "Anonymous structures are not supported. Embedded structures are
6786 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6787 * embedded structures in 1.10 only.
6789 if (state
->language_version
!= 110 &&
6790 decl_list
->type
->specifier
->structure
!= NULL
)
6791 _mesa_glsl_error(&loc
, state
,
6792 "embedded structure declarations are not allowed");
6794 const glsl_type
*decl_type
=
6795 decl_list
->type
->glsl_type(& type_name
, state
);
6797 const struct ast_type_qualifier
*const qual
=
6798 &decl_list
->type
->qualifier
;
6800 /* From section 4.3.9 of the GLSL 4.40 spec:
6802 * "[In interface blocks] opaque types are not allowed."
6804 * It should be impossible for decl_type to be NULL here. Cases that
6805 * might naturally lead to decl_type being NULL, especially for the
6806 * is_interface case, will have resulted in compilation having
6807 * already halted due to a syntax error.
6812 if (decl_type
->contains_opaque()) {
6813 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6814 "interface block contains opaque variable");
6817 if (decl_type
->contains_atomic()) {
6818 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6820 * "Members of structures cannot be declared as atomic counter
6823 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6826 if (decl_type
->contains_image()) {
6827 /* FINISHME: Same problem as with atomic counters.
6828 * FINISHME: Request clarification from Khronos and add
6829 * FINISHME: spec quotation here.
6831 _mesa_glsl_error(&loc
, state
, "image in structure");
6835 if (qual
->flags
.q
.explicit_binding
) {
6836 _mesa_glsl_error(&loc
, state
,
6837 "binding layout qualifier cannot be applied "
6838 "to struct or interface block members");
6842 if (!first_member
) {
6843 if (!layout
->flags
.q
.explicit_location
&&
6844 ((first_member_has_explicit_location
&&
6845 !qual
->flags
.q
.explicit_location
) ||
6846 (!first_member_has_explicit_location
&&
6847 qual
->flags
.q
.explicit_location
))) {
6848 _mesa_glsl_error(&loc
, state
,
6849 "when block-level location layout qualifier "
6850 "is not supplied either all members must "
6851 "have a location layout qualifier or all "
6852 "members must not have a location layout "
6856 first_member
= false;
6857 first_member_has_explicit_location
=
6858 qual
->flags
.q
.explicit_location
;
6862 if (qual
->flags
.q
.std140
||
6863 qual
->flags
.q
.std430
||
6864 qual
->flags
.q
.packed
||
6865 qual
->flags
.q
.shared
) {
6866 _mesa_glsl_error(&loc
, state
,
6867 "uniform/shader storage block layout qualifiers "
6868 "std140, std430, packed, and shared can only be "
6869 "applied to uniform/shader storage blocks, not "
6873 if (qual
->flags
.q
.constant
) {
6874 _mesa_glsl_error(&loc
, state
,
6875 "const storage qualifier cannot be applied "
6876 "to struct or interface block members");
6879 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6881 * "A block member may be declared with a stream identifier, but
6882 * the specified stream must match the stream associated with the
6883 * containing block."
6885 if (qual
->flags
.q
.explicit_stream
) {
6886 unsigned qual_stream
;
6887 if (process_qualifier_constant(state
, &loc
, "stream",
6888 qual
->stream
, &qual_stream
) &&
6889 qual_stream
!= block_stream
) {
6890 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6891 "interface block member does not match "
6892 "the interface block (%u vs %u)", qual_stream
,
6898 unsigned explicit_xfb_buffer
= 0;
6899 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6900 unsigned qual_xfb_buffer
;
6901 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6902 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6903 explicit_xfb_buffer
= 1;
6904 if (qual_xfb_buffer
!= block_xfb_buffer
)
6905 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6906 "interface block member does not match "
6907 "the interface block (%u vs %u)",
6908 qual_xfb_buffer
, block_xfb_buffer
);
6910 xfb_buffer
= (int) qual_xfb_buffer
;
6913 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
6914 xfb_buffer
= (int) block_xfb_buffer
;
6917 int xfb_stride
= -1;
6918 if (qual
->flags
.q
.explicit_xfb_stride
) {
6919 unsigned qual_xfb_stride
;
6920 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6921 qual
->xfb_stride
, &qual_xfb_stride
)) {
6922 xfb_stride
= (int) qual_xfb_stride
;
6926 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6927 _mesa_glsl_error(&loc
, state
,
6928 "interpolation qualifiers cannot be used "
6929 "with uniform interface blocks");
6932 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6933 qual
->has_auxiliary_storage()) {
6934 _mesa_glsl_error(&loc
, state
,
6935 "auxiliary storage qualifiers cannot be used "
6936 "in uniform blocks or structures.");
6939 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6940 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6941 _mesa_glsl_error(&loc
, state
,
6942 "row_major and column_major can only be "
6943 "applied to interface blocks");
6945 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6948 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6949 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6950 "readonly and writeonly.");
6953 foreach_list_typed (ast_declaration
, decl
, link
,
6954 &decl_list
->declarations
) {
6955 YYLTYPE loc
= decl
->get_location();
6957 if (!allow_reserved_names
)
6958 validate_identifier(decl
->identifier
, loc
, state
);
6960 const struct glsl_type
*field_type
=
6961 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6962 validate_array_dimensions(field_type
, state
, &loc
);
6963 fields
[i
].type
= field_type
;
6964 fields
[i
].name
= decl
->identifier
;
6965 fields
[i
].interpolation
=
6966 interpret_interpolation_qualifier(qual
, field_type
,
6967 var_mode
, state
, &loc
);
6968 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6969 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6970 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6971 fields
[i
].precision
= qual
->precision
;
6972 fields
[i
].offset
= -1;
6973 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6974 fields
[i
].xfb_buffer
= xfb_buffer
;
6975 fields
[i
].xfb_stride
= xfb_stride
;
6977 if (qual
->flags
.q
.explicit_location
) {
6978 unsigned qual_location
;
6979 if (process_qualifier_constant(state
, &loc
, "location",
6980 qual
->location
, &qual_location
)) {
6981 fields
[i
].location
= qual_location
+
6982 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
6983 expl_location
= fields
[i
].location
+
6984 fields
[i
].type
->count_attribute_slots(false);
6987 if (layout
&& layout
->flags
.q
.explicit_location
) {
6988 fields
[i
].location
= expl_location
;
6989 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6991 fields
[i
].location
= -1;
6995 /* Offset can only be used with std430 and std140 layouts an initial
6996 * value of 0 is used for error detection.
7002 if (qual
->flags
.q
.row_major
||
7003 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
7009 if(layout
->flags
.q
.std140
) {
7010 align
= field_type
->std140_base_alignment(row_major
);
7011 size
= field_type
->std140_size(row_major
);
7012 } else if (layout
->flags
.q
.std430
) {
7013 align
= field_type
->std430_base_alignment(row_major
);
7014 size
= field_type
->std430_size(row_major
);
7018 if (qual
->flags
.q
.explicit_offset
) {
7019 unsigned qual_offset
;
7020 if (process_qualifier_constant(state
, &loc
, "offset",
7021 qual
->offset
, &qual_offset
)) {
7022 if (align
!= 0 && size
!= 0) {
7023 if (next_offset
> qual_offset
)
7024 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7025 "offset overlaps previous member");
7027 if (qual_offset
% align
) {
7028 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7029 "must be a multiple of the base "
7030 "alignment of %s", field_type
->name
);
7032 fields
[i
].offset
= qual_offset
;
7033 next_offset
= glsl_align(qual_offset
+ size
, align
);
7035 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7036 "with std430 and std140 layouts");
7041 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7042 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7044 if (align
== 0 || size
== 0) {
7045 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7046 "std430 and std140 layouts");
7047 } else if (qual
->flags
.q
.explicit_align
) {
7048 unsigned member_align
;
7049 if (process_qualifier_constant(state
, &loc
, "align",
7050 qual
->align
, &member_align
)) {
7051 if (member_align
== 0 ||
7052 member_align
& (member_align
- 1)) {
7053 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7054 "in not a power of 2");
7056 fields
[i
].offset
= glsl_align(offset
, member_align
);
7057 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7061 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7062 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7064 } else if (!qual
->flags
.q
.explicit_offset
) {
7065 if (align
!= 0 && size
!= 0)
7066 next_offset
= glsl_align(next_offset
+ size
, align
);
7069 /* From the ARB_enhanced_layouts spec:
7071 * "The given offset applies to the first component of the first
7072 * member of the qualified entity. Then, within the qualified
7073 * entity, subsequent components are each assigned, in order, to
7074 * the next available offset aligned to a multiple of that
7075 * component's size. Aggregate types are flattened down to the
7076 * component level to get this sequence of components."
7078 if (qual
->flags
.q
.explicit_xfb_offset
) {
7079 unsigned xfb_offset
;
7080 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7081 qual
->offset
, &xfb_offset
)) {
7082 fields
[i
].offset
= xfb_offset
;
7083 block_xfb_offset
= fields
[i
].offset
+
7084 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
7087 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7088 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7089 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7091 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
7095 /* Propogate row- / column-major information down the fields of the
7096 * structure or interface block. Structures need this data because
7097 * the structure may contain a structure that contains ... a matrix
7098 * that need the proper layout.
7100 if (is_interface
&& layout
&&
7101 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7102 (field_type
->without_array()->is_matrix()
7103 || field_type
->without_array()->is_record())) {
7104 /* If no layout is specified for the field, inherit the layout
7107 fields
[i
].matrix_layout
= matrix_layout
;
7109 if (qual
->flags
.q
.row_major
)
7110 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7111 else if (qual
->flags
.q
.column_major
)
7112 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7114 /* If we're processing an uniform or buffer block, the matrix
7115 * layout must be decided by this point.
7117 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7118 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7121 /* Image qualifiers are allowed on buffer variables, which can only
7122 * be defined inside shader storage buffer objects
7124 if (layout
&& var_mode
== ir_var_shader_storage
) {
7125 /* For readonly and writeonly qualifiers the field definition,
7126 * if set, overwrites the layout qualifier.
7128 if (qual
->flags
.q
.read_only
) {
7129 fields
[i
].image_read_only
= true;
7130 fields
[i
].image_write_only
= false;
7131 } else if (qual
->flags
.q
.write_only
) {
7132 fields
[i
].image_read_only
= false;
7133 fields
[i
].image_write_only
= true;
7135 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
7136 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
7139 /* For other qualifiers, we set the flag if either the layout
7140 * qualifier or the field qualifier are set
7142 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
7143 layout
->flags
.q
.coherent
;
7144 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
7145 layout
->flags
.q
._volatile
;
7146 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
7147 layout
->flags
.q
.restrict_flag
;
7154 assert(i
== decl_count
);
7156 *fields_ret
= fields
;
7162 ast_struct_specifier::hir(exec_list
*instructions
,
7163 struct _mesa_glsl_parse_state
*state
)
7165 YYLTYPE loc
= this->get_location();
7167 unsigned expl_location
= 0;
7168 if (layout
&& layout
->flags
.q
.explicit_location
) {
7169 if (!process_qualifier_constant(state
, &loc
, "location",
7170 layout
->location
, &expl_location
)) {
7173 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7177 glsl_struct_field
*fields
;
7178 unsigned decl_count
=
7179 ast_process_struct_or_iface_block_members(instructions
,
7181 &this->declarations
,
7184 GLSL_MATRIX_LAYOUT_INHERITED
,
7185 false /* allow_reserved_names */,
7188 0, /* for interface only */
7189 0, /* for interface only */
7190 0, /* for interface only */
7192 0 /* for interface only */);
7194 validate_identifier(this->name
, loc
, state
);
7196 const glsl_type
*t
=
7197 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7199 if (!state
->symbols
->add_type(name
, t
)) {
7200 const glsl_type
*match
= state
->symbols
->get_type(name
);
7201 /* allow struct matching for desktop GL - older UE4 does this */
7202 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
7203 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7205 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7207 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7209 state
->num_user_structures
+ 1);
7211 s
[state
->num_user_structures
] = t
;
7212 state
->user_structures
= s
;
7213 state
->num_user_structures
++;
7217 /* Structure type definitions do not have r-values.
7224 * Visitor class which detects whether a given interface block has been used.
7226 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7229 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7230 : mode(mode
), block(block
), found(false)
7234 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7236 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7240 return visit_continue
;
7243 bool usage_found() const
7249 ir_variable_mode mode
;
7250 const glsl_type
*block
;
7255 is_unsized_array_last_element(ir_variable
*v
)
7257 const glsl_type
*interface_type
= v
->get_interface_type();
7258 int length
= interface_type
->length
;
7260 assert(v
->type
->is_unsized_array());
7262 /* Check if it is the last element of the interface */
7263 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7269 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7271 var
->data
.image_read_only
= field
.image_read_only
;
7272 var
->data
.image_write_only
= field
.image_write_only
;
7273 var
->data
.image_coherent
= field
.image_coherent
;
7274 var
->data
.image_volatile
= field
.image_volatile
;
7275 var
->data
.image_restrict
= field
.image_restrict
;
7279 ast_interface_block::hir(exec_list
*instructions
,
7280 struct _mesa_glsl_parse_state
*state
)
7282 YYLTYPE loc
= this->get_location();
7284 /* Interface blocks must be declared at global scope */
7285 if (state
->current_function
!= NULL
) {
7286 _mesa_glsl_error(&loc
, state
,
7287 "Interface block `%s' must be declared "
7292 /* Validate qualifiers:
7294 * - Layout Qualifiers as per the table in Section 4.4
7295 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7297 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7300 * "Additionally, memory qualifiers may also be used in the declaration
7301 * of shader storage blocks"
7303 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7304 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7305 * Layout Qualifiers) of the GLSL 4.50 spec says:
7307 * "The std430 qualifier is supported only for shader storage blocks;
7308 * using std430 on a uniform block will result in a compile-time error."
7310 ast_type_qualifier allowed_blk_qualifiers
;
7311 allowed_blk_qualifiers
.flags
.i
= 0;
7312 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7313 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7314 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7315 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7316 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7317 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7318 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7319 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7320 if (this->layout
.flags
.q
.buffer
) {
7321 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7322 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7323 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7324 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7325 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7326 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7327 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7329 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7332 /* Interface block */
7333 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7335 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7336 if (this->layout
.flags
.q
.out
) {
7337 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7338 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7339 state
->stage
== MESA_SHADER_TESS_CTRL
||
7340 state
->stage
== MESA_SHADER_TESS_EVAL
||
7341 state
->stage
== MESA_SHADER_VERTEX
) {
7342 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7343 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7344 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7345 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7346 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7347 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7348 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7349 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7351 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7352 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7356 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7357 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7358 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7363 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7364 "invalid qualifier for block",
7367 /* The ast_interface_block has a list of ast_declarator_lists. We
7368 * need to turn those into ir_variables with an association
7369 * with this uniform block.
7371 enum glsl_interface_packing packing
;
7372 if (this->layout
.flags
.q
.shared
) {
7373 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7374 } else if (this->layout
.flags
.q
.packed
) {
7375 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7376 } else if (this->layout
.flags
.q
.std430
) {
7377 packing
= GLSL_INTERFACE_PACKING_STD430
;
7379 /* The default layout is std140.
7381 packing
= GLSL_INTERFACE_PACKING_STD140
;
7384 ir_variable_mode var_mode
;
7385 const char *iface_type_name
;
7386 if (this->layout
.flags
.q
.in
) {
7387 var_mode
= ir_var_shader_in
;
7388 iface_type_name
= "in";
7389 } else if (this->layout
.flags
.q
.out
) {
7390 var_mode
= ir_var_shader_out
;
7391 iface_type_name
= "out";
7392 } else if (this->layout
.flags
.q
.uniform
) {
7393 var_mode
= ir_var_uniform
;
7394 iface_type_name
= "uniform";
7395 } else if (this->layout
.flags
.q
.buffer
) {
7396 var_mode
= ir_var_shader_storage
;
7397 iface_type_name
= "buffer";
7399 var_mode
= ir_var_auto
;
7400 iface_type_name
= "UNKNOWN";
7401 assert(!"interface block layout qualifier not found!");
7404 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7405 if (this->layout
.flags
.q
.row_major
)
7406 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7407 else if (this->layout
.flags
.q
.column_major
)
7408 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7410 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7411 exec_list declared_variables
;
7412 glsl_struct_field
*fields
;
7414 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7415 * that we don't have incompatible qualifiers
7417 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7418 _mesa_glsl_error(&loc
, state
,
7419 "Interface block sets both readonly and writeonly");
7422 unsigned qual_stream
;
7423 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7425 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7426 /* If the stream qualifier is invalid it doesn't make sense to continue
7427 * on and try to compare stream layouts on member variables against it
7428 * so just return early.
7433 unsigned qual_xfb_buffer
;
7434 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7435 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7436 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7440 unsigned qual_xfb_offset
;
7441 if (layout
.flags
.q
.explicit_xfb_offset
) {
7442 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7443 layout
.offset
, &qual_xfb_offset
)) {
7448 unsigned qual_xfb_stride
;
7449 if (layout
.flags
.q
.explicit_xfb_stride
) {
7450 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7451 layout
.xfb_stride
, &qual_xfb_stride
)) {
7456 unsigned expl_location
= 0;
7457 if (layout
.flags
.q
.explicit_location
) {
7458 if (!process_qualifier_constant(state
, &loc
, "location",
7459 layout
.location
, &expl_location
)) {
7462 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7463 : VARYING_SLOT_VAR0
;
7467 unsigned expl_align
= 0;
7468 if (layout
.flags
.q
.explicit_align
) {
7469 if (!process_qualifier_constant(state
, &loc
, "align",
7470 layout
.align
, &expl_align
)) {
7473 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7474 _mesa_glsl_error(&loc
, state
, "align layout qualifier is not a "
7481 unsigned int num_variables
=
7482 ast_process_struct_or_iface_block_members(&declared_variables
,
7484 &this->declarations
,
7488 redeclaring_per_vertex
,
7497 if (!redeclaring_per_vertex
) {
7498 validate_identifier(this->block_name
, loc
, state
);
7500 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7502 * "Block names have no other use within a shader beyond interface
7503 * matching; it is a compile-time error to use a block name at global
7504 * scope for anything other than as a block name."
7506 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7507 if (var
&& !var
->type
->is_interface()) {
7508 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7509 "already used in the scope.",
7514 const glsl_type
*earlier_per_vertex
= NULL
;
7515 if (redeclaring_per_vertex
) {
7516 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7517 * the named interface block gl_in, we can find it by looking at the
7518 * previous declaration of gl_in. Otherwise we can find it by looking
7519 * at the previous decalartion of any of the built-in outputs,
7522 * Also check that the instance name and array-ness of the redeclaration
7526 case ir_var_shader_in
:
7527 if (ir_variable
*earlier_gl_in
=
7528 state
->symbols
->get_variable("gl_in")) {
7529 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7531 _mesa_glsl_error(&loc
, state
,
7532 "redeclaration of gl_PerVertex input not allowed "
7534 _mesa_shader_stage_to_string(state
->stage
));
7536 if (this->instance_name
== NULL
||
7537 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7538 !this->array_specifier
->is_single_dimension()) {
7539 _mesa_glsl_error(&loc
, state
,
7540 "gl_PerVertex input must be redeclared as "
7544 case ir_var_shader_out
:
7545 if (ir_variable
*earlier_gl_Position
=
7546 state
->symbols
->get_variable("gl_Position")) {
7547 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7548 } else if (ir_variable
*earlier_gl_out
=
7549 state
->symbols
->get_variable("gl_out")) {
7550 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7552 _mesa_glsl_error(&loc
, state
,
7553 "redeclaration of gl_PerVertex output not "
7554 "allowed in the %s shader",
7555 _mesa_shader_stage_to_string(state
->stage
));
7557 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7558 if (this->instance_name
== NULL
||
7559 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7560 _mesa_glsl_error(&loc
, state
,
7561 "gl_PerVertex output must be redeclared as "
7565 if (this->instance_name
!= NULL
) {
7566 _mesa_glsl_error(&loc
, state
,
7567 "gl_PerVertex output may not be redeclared with "
7568 "an instance name");
7573 _mesa_glsl_error(&loc
, state
,
7574 "gl_PerVertex must be declared as an input or an "
7579 if (earlier_per_vertex
== NULL
) {
7580 /* An error has already been reported. Bail out to avoid null
7581 * dereferences later in this function.
7586 /* Copy locations from the old gl_PerVertex interface block. */
7587 for (unsigned i
= 0; i
< num_variables
; i
++) {
7588 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7590 _mesa_glsl_error(&loc
, state
,
7591 "redeclaration of gl_PerVertex must be a subset "
7592 "of the built-in members of gl_PerVertex");
7594 fields
[i
].location
=
7595 earlier_per_vertex
->fields
.structure
[j
].location
;
7597 earlier_per_vertex
->fields
.structure
[j
].offset
;
7598 fields
[i
].interpolation
=
7599 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7600 fields
[i
].centroid
=
7601 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7603 earlier_per_vertex
->fields
.structure
[j
].sample
;
7605 earlier_per_vertex
->fields
.structure
[j
].patch
;
7606 fields
[i
].precision
=
7607 earlier_per_vertex
->fields
.structure
[j
].precision
;
7608 fields
[i
].explicit_xfb_buffer
=
7609 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7610 fields
[i
].xfb_buffer
=
7611 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7612 fields
[i
].xfb_stride
=
7613 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7617 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7620 * If a built-in interface block is redeclared, it must appear in
7621 * the shader before any use of any member included in the built-in
7622 * declaration, or a compilation error will result.
7624 * This appears to be a clarification to the behaviour established for
7625 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7626 * regardless of GLSL version.
7628 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7629 v
.run(instructions
);
7630 if (v
.usage_found()) {
7631 _mesa_glsl_error(&loc
, state
,
7632 "redeclaration of a built-in interface block must "
7633 "appear before any use of any member of the "
7638 const glsl_type
*block_type
=
7639 glsl_type::get_interface_instance(fields
,
7643 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
7646 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7648 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7649 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7652 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7653 YYLTYPE loc
= this->get_location();
7654 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7655 "already taken in the current scope",
7656 this->block_name
, iface_type_name
);
7659 /* Since interface blocks cannot contain statements, it should be
7660 * impossible for the block to generate any instructions.
7662 assert(declared_variables
.is_empty());
7664 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7666 * Geometry shader input variables get the per-vertex values written
7667 * out by vertex shader output variables of the same names. Since a
7668 * geometry shader operates on a set of vertices, each input varying
7669 * variable (or input block, see interface blocks below) needs to be
7670 * declared as an array.
7672 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7673 var_mode
== ir_var_shader_in
) {
7674 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7675 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7676 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7677 !this->layout
.flags
.q
.patch
&&
7678 this->array_specifier
== NULL
&&
7679 var_mode
== ir_var_shader_in
) {
7680 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7681 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7682 !this->layout
.flags
.q
.patch
&&
7683 this->array_specifier
== NULL
&&
7684 var_mode
== ir_var_shader_out
) {
7685 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7689 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7692 * "If an instance name (instance-name) is used, then it puts all the
7693 * members inside a scope within its own name space, accessed with the
7694 * field selector ( . ) operator (analogously to structures)."
7696 if (this->instance_name
) {
7697 if (redeclaring_per_vertex
) {
7698 /* When a built-in in an unnamed interface block is redeclared,
7699 * get_variable_being_redeclared() calls
7700 * check_builtin_array_max_size() to make sure that built-in array
7701 * variables aren't redeclared to illegal sizes. But we're looking
7702 * at a redeclaration of a named built-in interface block. So we
7703 * have to manually call check_builtin_array_max_size() for all parts
7704 * of the interface that are arrays.
7706 for (unsigned i
= 0; i
< num_variables
; i
++) {
7707 if (fields
[i
].type
->is_array()) {
7708 const unsigned size
= fields
[i
].type
->array_size();
7709 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7713 validate_identifier(this->instance_name
, loc
, state
);
7718 if (this->array_specifier
!= NULL
) {
7719 const glsl_type
*block_array_type
=
7720 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7722 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7724 * For uniform blocks declared an array, each individual array
7725 * element corresponds to a separate buffer object backing one
7726 * instance of the block. As the array size indicates the number
7727 * of buffer objects needed, uniform block array declarations
7728 * must specify an array size.
7730 * And a few paragraphs later:
7732 * Geometry shader input blocks must be declared as arrays and
7733 * follow the array declaration and linking rules for all
7734 * geometry shader inputs. All other input and output block
7735 * arrays must specify an array size.
7737 * The same applies to tessellation shaders.
7739 * The upshot of this is that the only circumstance where an
7740 * interface array size *doesn't* need to be specified is on a
7741 * geometry shader input, tessellation control shader input,
7742 * tessellation control shader output, and tessellation evaluation
7745 if (block_array_type
->is_unsized_array()) {
7746 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7747 state
->stage
== MESA_SHADER_TESS_CTRL
||
7748 state
->stage
== MESA_SHADER_TESS_EVAL
;
7749 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7751 if (this->layout
.flags
.q
.in
) {
7753 _mesa_glsl_error(&loc
, state
,
7754 "unsized input block arrays not allowed in "
7756 _mesa_shader_stage_to_string(state
->stage
));
7757 } else if (this->layout
.flags
.q
.out
) {
7759 _mesa_glsl_error(&loc
, state
,
7760 "unsized output block arrays not allowed in "
7762 _mesa_shader_stage_to_string(state
->stage
));
7764 /* by elimination, this is a uniform block array */
7765 _mesa_glsl_error(&loc
, state
,
7766 "unsized uniform block arrays not allowed in "
7768 _mesa_shader_stage_to_string(state
->stage
));
7772 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7774 * * Arrays of arrays of blocks are not allowed
7776 if (state
->es_shader
&& block_array_type
->is_array() &&
7777 block_array_type
->fields
.array
->is_array()) {
7778 _mesa_glsl_error(&loc
, state
,
7779 "arrays of arrays interface blocks are "
7783 var
= new(state
) ir_variable(block_array_type
,
7784 this->instance_name
,
7787 var
= new(state
) ir_variable(block_type
,
7788 this->instance_name
,
7792 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7793 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7795 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7796 var
->data
.read_only
= true;
7798 var
->data
.patch
= this->layout
.flags
.q
.patch
;
7800 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7801 handle_geometry_shader_input_decl(state
, loc
, var
);
7802 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7803 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7804 handle_tess_shader_input_decl(state
, loc
, var
);
7805 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7806 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7808 for (unsigned i
= 0; i
< num_variables
; i
++) {
7809 if (var
->data
.mode
== ir_var_shader_storage
)
7810 apply_memory_qualifiers(var
, fields
[i
]);
7813 if (ir_variable
*earlier
=
7814 state
->symbols
->get_variable(this->instance_name
)) {
7815 if (!redeclaring_per_vertex
) {
7816 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7817 this->instance_name
);
7819 earlier
->data
.how_declared
= ir_var_declared_normally
;
7820 earlier
->type
= var
->type
;
7821 earlier
->reinit_interface_type(block_type
);
7824 if (this->layout
.flags
.q
.explicit_binding
) {
7825 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7829 var
->data
.stream
= qual_stream
;
7830 if (layout
.flags
.q
.explicit_location
) {
7831 var
->data
.location
= expl_location
;
7832 var
->data
.explicit_location
= true;
7835 state
->symbols
->add_variable(var
);
7836 instructions
->push_tail(var
);
7839 /* In order to have an array size, the block must also be declared with
7842 assert(this->array_specifier
== NULL
);
7844 for (unsigned i
= 0; i
< num_variables
; i
++) {
7846 new(state
) ir_variable(fields
[i
].type
,
7847 ralloc_strdup(state
, fields
[i
].name
),
7849 var
->data
.interpolation
= fields
[i
].interpolation
;
7850 var
->data
.centroid
= fields
[i
].centroid
;
7851 var
->data
.sample
= fields
[i
].sample
;
7852 var
->data
.patch
= fields
[i
].patch
;
7853 var
->data
.stream
= qual_stream
;
7854 var
->data
.location
= fields
[i
].location
;
7856 if (fields
[i
].location
!= -1)
7857 var
->data
.explicit_location
= true;
7859 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7860 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7862 if (fields
[i
].offset
!= -1)
7863 var
->data
.explicit_xfb_offset
= true;
7864 var
->data
.offset
= fields
[i
].offset
;
7866 var
->init_interface_type(block_type
);
7868 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7869 var
->data
.read_only
= true;
7871 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7872 if (state
->es_shader
) {
7873 var
->data
.precision
=
7874 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7878 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7879 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7880 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7882 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7885 if (var
->data
.mode
== ir_var_shader_storage
)
7886 apply_memory_qualifiers(var
, fields
[i
]);
7888 /* Examine var name here since var may get deleted in the next call */
7889 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7891 if (redeclaring_per_vertex
) {
7892 bool is_redeclaration
;
7893 ir_variable
*declared_var
=
7894 get_variable_being_redeclared(var
, loc
, state
,
7895 true /* allow_all_redeclarations */,
7897 if (!var_is_gl_id
|| !is_redeclaration
) {
7898 _mesa_glsl_error(&loc
, state
,
7899 "redeclaration of gl_PerVertex can only "
7900 "include built-in variables");
7901 } else if (declared_var
->data
.how_declared
== ir_var_declared_normally
) {
7902 _mesa_glsl_error(&loc
, state
,
7903 "`%s' has already been redeclared",
7904 declared_var
->name
);
7906 declared_var
->data
.how_declared
= ir_var_declared_in_block
;
7907 declared_var
->reinit_interface_type(block_type
);
7912 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7913 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7915 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7916 * The UBO declaration itself doesn't get an ir_variable unless it
7917 * has an instance name. This is ugly.
7919 if (this->layout
.flags
.q
.explicit_binding
) {
7920 apply_explicit_binding(state
, &loc
, var
,
7921 var
->get_interface_type(), &this->layout
);
7924 if (var
->type
->is_unsized_array()) {
7925 if (var
->is_in_shader_storage_block() &&
7926 is_unsized_array_last_element(var
)) {
7927 var
->data
.from_ssbo_unsized_array
= true;
7929 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7931 * "If an array is declared as the last member of a shader storage
7932 * block and the size is not specified at compile-time, it is
7933 * sized at run-time. In all other cases, arrays are sized only
7936 * In desktop GLSL it is allowed to have unsized-arrays that are
7937 * not last, as long as we can determine that they are implicitly
7940 if (state
->es_shader
) {
7941 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
7942 "definition: only last member of a shader "
7943 "storage block can be defined as unsized "
7944 "array", fields
[i
].name
);
7949 state
->symbols
->add_variable(var
);
7950 instructions
->push_tail(var
);
7953 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7954 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7956 * It is also a compilation error ... to redeclare a built-in
7957 * block and then use a member from that built-in block that was
7958 * not included in the redeclaration.
7960 * This appears to be a clarification to the behaviour established
7961 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7962 * behaviour regardless of GLSL version.
7964 * To prevent the shader from using a member that was not included in
7965 * the redeclaration, we disable any ir_variables that are still
7966 * associated with the old declaration of gl_PerVertex (since we've
7967 * already updated all of the variables contained in the new
7968 * gl_PerVertex to point to it).
7970 * As a side effect this will prevent
7971 * validate_intrastage_interface_blocks() from getting confused and
7972 * thinking there are conflicting definitions of gl_PerVertex in the
7975 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7976 ir_variable
*const var
= node
->as_variable();
7978 var
->get_interface_type() == earlier_per_vertex
&&
7979 var
->data
.mode
== var_mode
) {
7980 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7981 _mesa_glsl_error(&loc
, state
,
7982 "redeclaration of gl_PerVertex cannot "
7983 "follow a redeclaration of `%s'",
7986 state
->symbols
->disable_variable(var
->name
);
7998 ast_tcs_output_layout::hir(exec_list
*instructions
,
7999 struct _mesa_glsl_parse_state
*state
)
8001 YYLTYPE loc
= this->get_location();
8003 unsigned num_vertices
;
8004 if (!state
->out_qualifier
->vertices
->
8005 process_qualifier_constant(state
, "vertices", &num_vertices
,
8007 /* return here to stop cascading incorrect error messages */
8011 /* If any shader outputs occurred before this declaration and specified an
8012 * array size, make sure the size they specified is consistent with the
8015 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8016 _mesa_glsl_error(&loc
, state
,
8017 "this tessellation control shader output layout "
8018 "specifies %u vertices, but a previous output "
8019 "is declared with size %u",
8020 num_vertices
, state
->tcs_output_size
);
8024 state
->tcs_output_vertices_specified
= true;
8026 /* If any shader outputs occurred before this declaration and did not
8027 * specify an array size, their size is determined now.
8029 foreach_in_list (ir_instruction
, node
, instructions
) {
8030 ir_variable
*var
= node
->as_variable();
8031 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8034 /* Note: Not all tessellation control shader output are arrays. */
8035 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8038 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8039 _mesa_glsl_error(&loc
, state
,
8040 "this tessellation control shader output layout "
8041 "specifies %u vertices, but an access to element "
8042 "%u of output `%s' already exists", num_vertices
,
8043 var
->data
.max_array_access
, var
->name
);
8045 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8055 ast_gs_input_layout::hir(exec_list
*instructions
,
8056 struct _mesa_glsl_parse_state
*state
)
8058 YYLTYPE loc
= this->get_location();
8060 /* Should have been prevented by the parser. */
8061 assert(!state
->gs_input_prim_type_specified
8062 || state
->in_qualifier
->prim_type
== this->prim_type
);
8064 /* If any shader inputs occurred before this declaration and specified an
8065 * array size, make sure the size they specified is consistent with the
8068 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8069 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8070 _mesa_glsl_error(&loc
, state
,
8071 "this geometry shader input layout implies %u vertices"
8072 " per primitive, but a previous input is declared"
8073 " with size %u", num_vertices
, state
->gs_input_size
);
8077 state
->gs_input_prim_type_specified
= true;
8079 /* If any shader inputs occurred before this declaration and did not
8080 * specify an array size, their size is determined now.
8082 foreach_in_list(ir_instruction
, node
, instructions
) {
8083 ir_variable
*var
= node
->as_variable();
8084 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8087 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8091 if (var
->type
->is_unsized_array()) {
8092 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8093 _mesa_glsl_error(&loc
, state
,
8094 "this geometry shader input layout implies %u"
8095 " vertices, but an access to element %u of input"
8096 " `%s' already exists", num_vertices
,
8097 var
->data
.max_array_access
, var
->name
);
8099 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8110 ast_cs_input_layout::hir(exec_list
*instructions
,
8111 struct _mesa_glsl_parse_state
*state
)
8113 YYLTYPE loc
= this->get_location();
8115 /* From the ARB_compute_shader specification:
8117 * If the local size of the shader in any dimension is greater
8118 * than the maximum size supported by the implementation for that
8119 * dimension, a compile-time error results.
8121 * It is not clear from the spec how the error should be reported if
8122 * the total size of the work group exceeds
8123 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8124 * report it at compile time as well.
8126 GLuint64 total_invocations
= 1;
8127 unsigned qual_local_size
[3];
8128 for (int i
= 0; i
< 3; i
++) {
8130 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8132 /* Infer a local_size of 1 for unspecified dimensions */
8133 if (this->local_size
[i
] == NULL
) {
8134 qual_local_size
[i
] = 1;
8135 } else if (!this->local_size
[i
]->
8136 process_qualifier_constant(state
, local_size_str
,
8137 &qual_local_size
[i
], false)) {
8138 ralloc_free(local_size_str
);
8141 ralloc_free(local_size_str
);
8143 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8144 _mesa_glsl_error(&loc
, state
,
8145 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8147 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8150 total_invocations
*= qual_local_size
[i
];
8151 if (total_invocations
>
8152 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8153 _mesa_glsl_error(&loc
, state
,
8154 "product of local_sizes exceeds "
8155 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8156 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8161 /* If any compute input layout declaration preceded this one, make sure it
8162 * was consistent with this one.
8164 if (state
->cs_input_local_size_specified
) {
8165 for (int i
= 0; i
< 3; i
++) {
8166 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8167 _mesa_glsl_error(&loc
, state
,
8168 "compute shader input layout does not match"
8169 " previous declaration");
8175 /* The ARB_compute_variable_group_size spec says:
8177 * If a compute shader including a *local_size_variable* qualifier also
8178 * declares a fixed local group size using the *local_size_x*,
8179 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8182 if (state
->cs_input_local_size_variable_specified
) {
8183 _mesa_glsl_error(&loc
, state
,
8184 "compute shader can't include both a variable and a "
8185 "fixed local group size");
8189 state
->cs_input_local_size_specified
= true;
8190 for (int i
= 0; i
< 3; i
++)
8191 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8193 /* We may now declare the built-in constant gl_WorkGroupSize (see
8194 * builtin_variable_generator::generate_constants() for why we didn't
8195 * declare it earlier).
8197 ir_variable
*var
= new(state
->symbols
)
8198 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8199 var
->data
.how_declared
= ir_var_declared_implicitly
;
8200 var
->data
.read_only
= true;
8201 instructions
->push_tail(var
);
8202 state
->symbols
->add_variable(var
);
8203 ir_constant_data data
;
8204 memset(&data
, 0, sizeof(data
));
8205 for (int i
= 0; i
< 3; i
++)
8206 data
.u
[i
] = qual_local_size
[i
];
8207 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8208 var
->constant_initializer
=
8209 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8210 var
->data
.has_initializer
= true;
8217 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8218 exec_list
*instructions
)
8220 bool gl_FragColor_assigned
= false;
8221 bool gl_FragData_assigned
= false;
8222 bool gl_FragSecondaryColor_assigned
= false;
8223 bool gl_FragSecondaryData_assigned
= false;
8224 bool user_defined_fs_output_assigned
= false;
8225 ir_variable
*user_defined_fs_output
= NULL
;
8227 /* It would be nice to have proper location information. */
8229 memset(&loc
, 0, sizeof(loc
));
8231 foreach_in_list(ir_instruction
, node
, instructions
) {
8232 ir_variable
*var
= node
->as_variable();
8234 if (!var
|| !var
->data
.assigned
)
8237 if (strcmp(var
->name
, "gl_FragColor") == 0)
8238 gl_FragColor_assigned
= true;
8239 else if (strcmp(var
->name
, "gl_FragData") == 0)
8240 gl_FragData_assigned
= true;
8241 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8242 gl_FragSecondaryColor_assigned
= true;
8243 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8244 gl_FragSecondaryData_assigned
= true;
8245 else if (!is_gl_identifier(var
->name
)) {
8246 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8247 var
->data
.mode
== ir_var_shader_out
) {
8248 user_defined_fs_output_assigned
= true;
8249 user_defined_fs_output
= var
;
8254 /* From the GLSL 1.30 spec:
8256 * "If a shader statically assigns a value to gl_FragColor, it
8257 * may not assign a value to any element of gl_FragData. If a
8258 * shader statically writes a value to any element of
8259 * gl_FragData, it may not assign a value to
8260 * gl_FragColor. That is, a shader may assign values to either
8261 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8262 * linked together must also consistently write just one of
8263 * these variables. Similarly, if user declared output
8264 * variables are in use (statically assigned to), then the
8265 * built-in variables gl_FragColor and gl_FragData may not be
8266 * assigned to. These incorrect usages all generate compile
8269 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8270 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8271 "`gl_FragColor' and `gl_FragData'");
8272 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8273 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8274 "`gl_FragColor' and `%s'",
8275 user_defined_fs_output
->name
);
8276 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8277 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8278 "`gl_FragSecondaryColorEXT' and"
8279 " `gl_FragSecondaryDataEXT'");
8280 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8281 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8282 "`gl_FragColor' and"
8283 " `gl_FragSecondaryDataEXT'");
8284 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8285 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8287 " `gl_FragSecondaryColorEXT'");
8288 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8289 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8290 "`gl_FragData' and `%s'",
8291 user_defined_fs_output
->name
);
8294 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8295 !state
->EXT_blend_func_extended_enable
) {
8296 _mesa_glsl_error(&loc
, state
,
8297 "Dual source blending requires EXT_blend_func_extended");
8303 remove_per_vertex_blocks(exec_list
*instructions
,
8304 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8306 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8307 * if it exists in this shader type.
8309 const glsl_type
*per_vertex
= NULL
;
8311 case ir_var_shader_in
:
8312 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8313 per_vertex
= gl_in
->get_interface_type();
8315 case ir_var_shader_out
:
8316 if (ir_variable
*gl_Position
=
8317 state
->symbols
->get_variable("gl_Position")) {
8318 per_vertex
= gl_Position
->get_interface_type();
8322 assert(!"Unexpected mode");
8326 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8327 * need to do anything.
8329 if (per_vertex
== NULL
)
8332 /* If the interface block is used by the shader, then we don't need to do
8335 interface_block_usage_visitor
v(mode
, per_vertex
);
8336 v
.run(instructions
);
8337 if (v
.usage_found())
8340 /* Remove any ir_variable declarations that refer to the interface block
8343 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8344 ir_variable
*const var
= node
->as_variable();
8345 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8346 var
->data
.mode
== mode
) {
8347 state
->symbols
->disable_variable(var
->name
);