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 memory_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 * (memory_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
.memory_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
.memory_read_only
))) {
951 /* We can have memory_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 * (memory_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_memory_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 "
3316 validate_image_format_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3318 const struct ast_type_qualifier
*qual
,
3319 const glsl_type
*type
)
3321 /* From section 4.4.6.2 (Format Layout Qualifiers) of the GLSL 4.50 spec:
3323 * "Format layout qualifiers can be used on image variable declarations
3324 * (those declared with a basic type having “image ” in its keyword)."
3326 if (!type
->is_image() && qual
->flags
.q
.explicit_image_format
) {
3327 _mesa_glsl_error(loc
, state
, "format layout qualifiers may only be "
3328 "applied to images");
3335 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3337 struct _mesa_glsl_parse_state
*state
,
3340 const glsl_type
*base_type
= var
->type
->without_array();
3342 if (!validate_image_format_qualifier_for_type(state
, loc
, qual
, base_type
) ||
3343 !validate_memory_qualifier_for_type(state
, loc
, qual
, base_type
))
3346 if (!base_type
->is_image())
3349 if (var
->data
.mode
!= ir_var_uniform
&&
3350 var
->data
.mode
!= ir_var_function_in
) {
3351 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
3352 "function parameters or uniform-qualified "
3353 "global variables");
3356 var
->data
.memory_read_only
|= qual
->flags
.q
.read_only
;
3357 var
->data
.memory_write_only
|= qual
->flags
.q
.write_only
;
3358 var
->data
.memory_coherent
|= qual
->flags
.q
.coherent
;
3359 var
->data
.memory_volatile
|= qual
->flags
.q
._volatile
;
3360 var
->data
.memory_restrict
|= qual
->flags
.q
.restrict_flag
;
3361 var
->data
.read_only
= true;
3363 if (qual
->flags
.q
.explicit_image_format
) {
3364 if (var
->data
.mode
== ir_var_function_in
) {
3365 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be used on "
3366 "image function parameters");
3369 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3370 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the base "
3371 "data type of the image");
3374 var
->data
.image_format
= qual
->image_format
;
3376 if (var
->data
.mode
== ir_var_uniform
) {
3377 if (state
->es_shader
) {
3378 _mesa_glsl_error(loc
, state
, "all image uniforms must have a "
3379 "format layout qualifier");
3380 } else if (!qual
->flags
.q
.write_only
) {
3381 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3382 "`writeonly' must have a format layout qualifier");
3385 var
->data
.image_format
= GL_NONE
;
3388 /* From page 70 of the GLSL ES 3.1 specification:
3390 * "Except for image variables qualified with the format qualifiers r32f,
3391 * r32i, and r32ui, image variables must specify either memory qualifier
3392 * readonly or the memory qualifier writeonly."
3394 if (state
->es_shader
&&
3395 var
->data
.image_format
!= GL_R32F
&&
3396 var
->data
.image_format
!= GL_R32I
&&
3397 var
->data
.image_format
!= GL_R32UI
&&
3398 !var
->data
.memory_read_only
&&
3399 !var
->data
.memory_write_only
) {
3400 _mesa_glsl_error(loc
, state
, "image variables of format other than r32f, "
3401 "r32i or r32ui must be qualified `readonly' or "
3406 static inline const char*
3407 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3409 if (origin_upper_left
&& pixel_center_integer
)
3410 return "origin_upper_left, pixel_center_integer";
3411 else if (origin_upper_left
)
3412 return "origin_upper_left";
3413 else if (pixel_center_integer
)
3414 return "pixel_center_integer";
3420 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3421 const struct ast_type_qualifier
*qual
)
3423 /* If gl_FragCoord was previously declared, and the qualifiers were
3424 * different in any way, return true.
3426 if (state
->fs_redeclares_gl_fragcoord
) {
3427 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3428 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3435 validate_array_dimensions(const glsl_type
*t
,
3436 struct _mesa_glsl_parse_state
*state
,
3438 if (t
->is_array()) {
3439 t
= t
->fields
.array
;
3440 while (t
->is_array()) {
3441 if (t
->is_unsized_array()) {
3442 _mesa_glsl_error(loc
, state
,
3443 "only the outermost array dimension can "
3448 t
= t
->fields
.array
;
3454 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3456 struct _mesa_glsl_parse_state
*state
,
3459 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3461 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3463 * "Within any shader, the first redeclarations of gl_FragCoord
3464 * must appear before any use of gl_FragCoord."
3466 * Generate a compiler error if above condition is not met by the
3469 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3470 if (earlier
!= NULL
&&
3471 earlier
->data
.used
&&
3472 !state
->fs_redeclares_gl_fragcoord
) {
3473 _mesa_glsl_error(loc
, state
,
3474 "gl_FragCoord used before its first redeclaration "
3475 "in fragment shader");
3478 /* Make sure all gl_FragCoord redeclarations specify the same layout
3481 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3482 const char *const qual_string
=
3483 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3484 qual
->flags
.q
.pixel_center_integer
);
3486 const char *const state_string
=
3487 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3488 state
->fs_pixel_center_integer
);
3490 _mesa_glsl_error(loc
, state
,
3491 "gl_FragCoord redeclared with different layout "
3492 "qualifiers (%s) and (%s) ",
3496 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3497 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3498 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3499 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3500 state
->fs_redeclares_gl_fragcoord
=
3501 state
->fs_origin_upper_left
||
3502 state
->fs_pixel_center_integer
||
3503 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3506 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3507 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3508 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3509 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3510 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3511 ? "origin_upper_left" : "pixel_center_integer";
3513 _mesa_glsl_error(loc
, state
,
3514 "layout qualifier `%s' can only be applied to "
3515 "fragment shader input `gl_FragCoord'",
3519 if (qual
->flags
.q
.explicit_location
) {
3520 apply_explicit_location(qual
, var
, state
, loc
);
3522 if (qual
->flags
.q
.explicit_component
) {
3523 unsigned qual_component
;
3524 if (process_qualifier_constant(state
, loc
, "component",
3525 qual
->component
, &qual_component
)) {
3526 const glsl_type
*type
= var
->type
->without_array();
3527 unsigned components
= type
->component_slots();
3529 if (type
->is_matrix() || type
->is_record()) {
3530 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3531 "cannot be applied to a matrix, a structure, "
3532 "a block, or an array containing any of "
3534 } else if (qual_component
!= 0 &&
3535 (qual_component
+ components
- 1) > 3) {
3536 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3537 (qual_component
+ components
- 1));
3538 } else if (qual_component
== 1 && type
->is_64bit()) {
3539 /* We don't bother checking for 3 as it should be caught by the
3540 * overflow check above.
3542 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3543 "component 1 or 3");
3545 var
->data
.explicit_component
= true;
3546 var
->data
.location_frac
= qual_component
;
3550 } else if (qual
->flags
.q
.explicit_index
) {
3551 if (!qual
->subroutine_list
)
3552 _mesa_glsl_error(loc
, state
,
3553 "explicit index requires explicit location");
3554 } else if (qual
->flags
.q
.explicit_component
) {
3555 _mesa_glsl_error(loc
, state
,
3556 "explicit component requires explicit location");
3559 if (qual
->flags
.q
.explicit_binding
) {
3560 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3563 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3564 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3565 unsigned qual_stream
;
3566 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3568 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3569 var
->data
.stream
= qual_stream
;
3573 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3574 unsigned qual_xfb_buffer
;
3575 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3576 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3577 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3578 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3579 if (qual
->flags
.q
.explicit_xfb_buffer
)
3580 var
->data
.explicit_xfb_buffer
= true;
3584 if (qual
->flags
.q
.explicit_xfb_offset
) {
3585 unsigned qual_xfb_offset
;
3586 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3588 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3589 qual
->offset
, &qual_xfb_offset
) &&
3590 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3591 var
->type
, component_size
)) {
3592 var
->data
.offset
= qual_xfb_offset
;
3593 var
->data
.explicit_xfb_offset
= true;
3597 if (qual
->flags
.q
.explicit_xfb_stride
) {
3598 unsigned qual_xfb_stride
;
3599 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3600 qual
->xfb_stride
, &qual_xfb_stride
)) {
3601 var
->data
.xfb_stride
= qual_xfb_stride
;
3602 var
->data
.explicit_xfb_stride
= true;
3606 if (var
->type
->contains_atomic()) {
3607 if (var
->data
.mode
== ir_var_uniform
) {
3608 if (var
->data
.explicit_binding
) {
3610 &state
->atomic_counter_offsets
[var
->data
.binding
];
3612 if (*offset
% ATOMIC_COUNTER_SIZE
)
3613 _mesa_glsl_error(loc
, state
,
3614 "misaligned atomic counter offset");
3616 var
->data
.offset
= *offset
;
3617 *offset
+= var
->type
->atomic_size();
3620 _mesa_glsl_error(loc
, state
,
3621 "atomic counters require explicit binding point");
3623 } else if (var
->data
.mode
!= ir_var_function_in
) {
3624 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3625 "function parameters or uniform-qualified "
3626 "global variables");
3630 if (var
->type
->contains_sampler()) {
3631 if (var
->data
.mode
!= ir_var_uniform
&&
3632 var
->data
.mode
!= ir_var_function_in
) {
3633 _mesa_glsl_error(loc
, state
, "sampler variables may only be declared "
3634 "as function parameters or uniform-qualified "
3635 "global variables");
3639 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3640 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3641 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3642 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3643 * These extensions and all following extensions that add the 'layout'
3644 * keyword have been modified to require the use of 'in' or 'out'.
3646 * The following extension do not allow the deprecated keywords:
3648 * GL_AMD_conservative_depth
3649 * GL_ARB_conservative_depth
3650 * GL_ARB_gpu_shader5
3651 * GL_ARB_separate_shader_objects
3652 * GL_ARB_tessellation_shader
3653 * GL_ARB_transform_feedback3
3654 * GL_ARB_uniform_buffer_object
3656 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3657 * allow layout with the deprecated keywords.
3659 const bool relaxed_layout_qualifier_checking
=
3660 state
->ARB_fragment_coord_conventions_enable
;
3662 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3663 || qual
->flags
.q
.varying
;
3664 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3665 if (relaxed_layout_qualifier_checking
) {
3666 _mesa_glsl_warning(loc
, state
,
3667 "`layout' qualifier may not be used with "
3668 "`attribute' or `varying'");
3670 _mesa_glsl_error(loc
, state
,
3671 "`layout' qualifier may not be used with "
3672 "`attribute' or `varying'");
3676 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3677 * AMD_conservative_depth.
3679 if (qual
->flags
.q
.depth_type
3680 && !state
->is_version(420, 0)
3681 && !state
->AMD_conservative_depth_enable
3682 && !state
->ARB_conservative_depth_enable
) {
3683 _mesa_glsl_error(loc
, state
,
3684 "extension GL_AMD_conservative_depth or "
3685 "GL_ARB_conservative_depth must be enabled "
3686 "to use depth layout qualifiers");
3687 } else if (qual
->flags
.q
.depth_type
3688 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3689 _mesa_glsl_error(loc
, state
,
3690 "depth layout qualifiers can be applied only to "
3694 switch (qual
->depth_type
) {
3696 var
->data
.depth_layout
= ir_depth_layout_any
;
3698 case ast_depth_greater
:
3699 var
->data
.depth_layout
= ir_depth_layout_greater
;
3701 case ast_depth_less
:
3702 var
->data
.depth_layout
= ir_depth_layout_less
;
3704 case ast_depth_unchanged
:
3705 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3708 var
->data
.depth_layout
= ir_depth_layout_none
;
3712 if (qual
->flags
.q
.std140
||
3713 qual
->flags
.q
.std430
||
3714 qual
->flags
.q
.packed
||
3715 qual
->flags
.q
.shared
) {
3716 _mesa_glsl_error(loc
, state
,
3717 "uniform and shader storage block layout qualifiers "
3718 "std140, std430, packed, and shared can only be "
3719 "applied to uniform or shader storage blocks, not "
3723 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3724 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3727 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3730 * "Fragment shaders also allow the following layout qualifier on in only
3731 * (not with variable declarations)
3732 * layout-qualifier-id
3733 * early_fragment_tests
3736 if (qual
->flags
.q
.early_fragment_tests
) {
3737 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3738 "valid in fragment shader input layout declaration.");
3741 if (qual
->flags
.q
.inner_coverage
) {
3742 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3743 "valid in fragment shader input layout declaration.");
3746 if (qual
->flags
.q
.post_depth_coverage
) {
3747 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3748 "valid in fragment shader input layout declaration.");
3753 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3755 struct _mesa_glsl_parse_state
*state
,
3759 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3761 if (qual
->flags
.q
.invariant
) {
3762 if (var
->data
.used
) {
3763 _mesa_glsl_error(loc
, state
,
3764 "variable `%s' may not be redeclared "
3765 "`invariant' after being used",
3768 var
->data
.invariant
= 1;
3772 if (qual
->flags
.q
.precise
) {
3773 if (var
->data
.used
) {
3774 _mesa_glsl_error(loc
, state
,
3775 "variable `%s' may not be redeclared "
3776 "`precise' after being used",
3779 var
->data
.precise
= 1;
3783 if (qual
->is_subroutine_decl() && !qual
->flags
.q
.uniform
) {
3784 _mesa_glsl_error(loc
, state
,
3785 "`subroutine' may only be applied to uniforms, "
3786 "subroutine type declarations, or function definitions");
3789 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3790 || qual
->flags
.q
.uniform
3791 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3792 var
->data
.read_only
= 1;
3794 if (qual
->flags
.q
.centroid
)
3795 var
->data
.centroid
= 1;
3797 if (qual
->flags
.q
.sample
)
3798 var
->data
.sample
= 1;
3800 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3801 if (state
->es_shader
) {
3802 var
->data
.precision
=
3803 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3806 if (qual
->flags
.q
.patch
)
3807 var
->data
.patch
= 1;
3809 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3810 var
->type
= glsl_type::error_type
;
3811 _mesa_glsl_error(loc
, state
,
3812 "`attribute' variables may not be declared in the "
3814 _mesa_shader_stage_to_string(state
->stage
));
3817 /* Disallow layout qualifiers which may only appear on layout declarations. */
3818 if (qual
->flags
.q
.prim_type
) {
3819 _mesa_glsl_error(loc
, state
,
3820 "Primitive type may only be specified on GS input or output "
3821 "layout declaration, not on variables.");
3824 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3826 * "However, the const qualifier cannot be used with out or inout."
3828 * The same section of the GLSL 4.40 spec further clarifies this saying:
3830 * "The const qualifier cannot be used with out or inout, or a
3831 * compile-time error results."
3833 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3834 _mesa_glsl_error(loc
, state
,
3835 "`const' may not be applied to `out' or `inout' "
3836 "function parameters");
3839 /* If there is no qualifier that changes the mode of the variable, leave
3840 * the setting alone.
3842 assert(var
->data
.mode
!= ir_var_temporary
);
3843 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3844 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
3845 else if (qual
->flags
.q
.in
)
3846 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3847 else if (qual
->flags
.q
.attribute
3848 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3849 var
->data
.mode
= ir_var_shader_in
;
3850 else if (qual
->flags
.q
.out
)
3851 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3852 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3853 var
->data
.mode
= ir_var_shader_out
;
3854 else if (qual
->flags
.q
.uniform
)
3855 var
->data
.mode
= ir_var_uniform
;
3856 else if (qual
->flags
.q
.buffer
)
3857 var
->data
.mode
= ir_var_shader_storage
;
3858 else if (qual
->flags
.q
.shared_storage
)
3859 var
->data
.mode
= ir_var_shader_shared
;
3861 var
->data
.fb_fetch_output
= state
->stage
== MESA_SHADER_FRAGMENT
&&
3862 qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
3864 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3865 /* User-defined ins/outs are not permitted in compute shaders. */
3866 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3867 _mesa_glsl_error(loc
, state
,
3868 "user-defined input and output variables are not "
3869 "permitted in compute shaders");
3872 /* This variable is being used to link data between shader stages (in
3873 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3874 * that is allowed for such purposes.
3876 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3878 * "The varying qualifier can be used only with the data types
3879 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3882 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3883 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3885 * "Fragment inputs can only be signed and unsigned integers and
3886 * integer vectors, float, floating-point vectors, matrices, or
3887 * arrays of these. Structures cannot be input.
3889 * Similar text exists in the section on vertex shader outputs.
3891 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3892 * 3.00 spec allows structs as well. Varying structs are also allowed
3895 switch (var
->type
->without_array()->base_type
) {
3896 case GLSL_TYPE_FLOAT
:
3897 /* Ok in all GLSL versions */
3899 case GLSL_TYPE_UINT
:
3901 if (state
->is_version(130, 300))
3903 _mesa_glsl_error(loc
, state
,
3904 "varying variables must be of base type float in %s",
3905 state
->get_version_string());
3907 case GLSL_TYPE_STRUCT
:
3908 if (state
->is_version(150, 300))
3910 _mesa_glsl_error(loc
, state
,
3911 "varying variables may not be of type struct");
3913 case GLSL_TYPE_DOUBLE
:
3914 case GLSL_TYPE_UINT64
:
3915 case GLSL_TYPE_INT64
:
3918 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3923 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3924 switch (state
->stage
) {
3925 case MESA_SHADER_VERTEX
:
3926 if (var
->data
.mode
== ir_var_shader_out
)
3927 var
->data
.invariant
= true;
3929 case MESA_SHADER_TESS_CTRL
:
3930 case MESA_SHADER_TESS_EVAL
:
3931 case MESA_SHADER_GEOMETRY
:
3932 if ((var
->data
.mode
== ir_var_shader_in
)
3933 || (var
->data
.mode
== ir_var_shader_out
))
3934 var
->data
.invariant
= true;
3936 case MESA_SHADER_FRAGMENT
:
3937 if (var
->data
.mode
== ir_var_shader_in
)
3938 var
->data
.invariant
= true;
3940 case MESA_SHADER_COMPUTE
:
3941 /* Invariance isn't meaningful in compute shaders. */
3946 var
->data
.interpolation
=
3947 interpret_interpolation_qualifier(qual
, var
->type
,
3948 (ir_variable_mode
) var
->data
.mode
,
3951 /* Does the declaration use the deprecated 'attribute' or 'varying'
3954 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3955 || qual
->flags
.q
.varying
;
3958 /* Validate auxiliary storage qualifiers */
3960 /* From section 4.3.4 of the GLSL 1.30 spec:
3961 * "It is an error to use centroid in in a vertex shader."
3963 * From section 4.3.4 of the GLSL ES 3.00 spec:
3964 * "It is an error to use centroid in or interpolation qualifiers in
3965 * a vertex shader input."
3968 /* Section 4.3.6 of the GLSL 1.30 specification states:
3969 * "It is an error to use centroid out in a fragment shader."
3971 * The GL_ARB_shading_language_420pack extension specification states:
3972 * "It is an error to use auxiliary storage qualifiers or interpolation
3973 * qualifiers on an output in a fragment shader."
3975 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3976 _mesa_glsl_error(loc
, state
,
3977 "sample qualifier may only be used on `in` or `out` "
3978 "variables between shader stages");
3980 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3981 _mesa_glsl_error(loc
, state
,
3982 "centroid qualifier may only be used with `in', "
3983 "`out' or `varying' variables between shader stages");
3986 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3987 _mesa_glsl_error(loc
, state
,
3988 "the shared storage qualifiers can only be used with "
3992 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3996 * Get the variable that is being redeclared by this declaration or if it
3997 * does not exist, the current declared variable.
3999 * Semantic checks to verify the validity of the redeclaration are also
4000 * performed. If semantic checks fail, compilation error will be emitted via
4001 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
4004 * A pointer to an existing variable in the current scope if the declaration
4005 * is a redeclaration, current variable otherwise. \c is_declared boolean
4006 * will return \c true if the declaration is a redeclaration, \c false
4009 static ir_variable
*
4010 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
4011 struct _mesa_glsl_parse_state
*state
,
4012 bool allow_all_redeclarations
,
4013 bool *is_redeclaration
)
4015 /* Check if this declaration is actually a re-declaration, either to
4016 * resize an array or add qualifiers to an existing variable.
4018 * This is allowed for variables in the current scope, or when at
4019 * global scope (for built-ins in the implicit outer scope).
4021 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
4022 if (earlier
== NULL
||
4023 (state
->current_function
!= NULL
&&
4024 !state
->symbols
->name_declared_this_scope(var
->name
))) {
4025 *is_redeclaration
= false;
4029 *is_redeclaration
= true;
4031 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4033 * "It is legal to declare an array without a size and then
4034 * later re-declare the same name as an array of the same
4035 * type and specify a size."
4037 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
4038 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
4039 /* FINISHME: This doesn't match the qualifiers on the two
4040 * FINISHME: declarations. It's not 100% clear whether this is
4041 * FINISHME: required or not.
4044 const int size
= var
->type
->array_size();
4045 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
4046 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4047 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4049 earlier
->data
.max_array_access
);
4052 earlier
->type
= var
->type
;
4055 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4056 state
->is_version(150, 0))
4057 && strcmp(var
->name
, "gl_FragCoord") == 0
4058 && earlier
->type
== var
->type
4059 && var
->data
.mode
== ir_var_shader_in
) {
4060 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4063 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
4064 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
4066 /* According to section 4.3.7 of the GLSL 1.30 spec,
4067 * the following built-in varaibles can be redeclared with an
4068 * interpolation qualifier:
4071 * * gl_FrontSecondaryColor
4072 * * gl_BackSecondaryColor
4074 * * gl_SecondaryColor
4076 } else if (state
->is_version(130, 0)
4077 && (strcmp(var
->name
, "gl_FrontColor") == 0
4078 || strcmp(var
->name
, "gl_BackColor") == 0
4079 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4080 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4081 || strcmp(var
->name
, "gl_Color") == 0
4082 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
4083 && earlier
->type
== var
->type
4084 && earlier
->data
.mode
== var
->data
.mode
) {
4085 earlier
->data
.interpolation
= var
->data
.interpolation
;
4087 /* Layout qualifiers for gl_FragDepth. */
4088 } else if ((state
->is_version(420, 0) ||
4089 state
->AMD_conservative_depth_enable
||
4090 state
->ARB_conservative_depth_enable
)
4091 && strcmp(var
->name
, "gl_FragDepth") == 0
4092 && earlier
->type
== var
->type
4093 && earlier
->data
.mode
== var
->data
.mode
) {
4095 /** From the AMD_conservative_depth spec:
4096 * Within any shader, the first redeclarations of gl_FragDepth
4097 * must appear before any use of gl_FragDepth.
4099 if (earlier
->data
.used
) {
4100 _mesa_glsl_error(&loc
, state
,
4101 "the first redeclaration of gl_FragDepth "
4102 "must appear before any use of gl_FragDepth");
4105 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4106 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4107 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4108 _mesa_glsl_error(&loc
, state
,
4109 "gl_FragDepth: depth layout is declared here "
4110 "as '%s, but it was previously declared as "
4112 depth_layout_string(var
->data
.depth_layout
),
4113 depth_layout_string(earlier
->data
.depth_layout
));
4116 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4118 } else if (state
->has_framebuffer_fetch() &&
4119 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4120 var
->type
== earlier
->type
&&
4121 var
->data
.mode
== ir_var_auto
) {
4122 /* According to the EXT_shader_framebuffer_fetch spec:
4124 * "By default, gl_LastFragData is declared with the mediump precision
4125 * qualifier. This can be changed by redeclaring the corresponding
4126 * variables with the desired precision qualifier."
4128 earlier
->data
.precision
= var
->data
.precision
;
4130 } else if (allow_all_redeclarations
) {
4131 if (earlier
->data
.mode
!= var
->data
.mode
) {
4132 _mesa_glsl_error(&loc
, state
,
4133 "redeclaration of `%s' with incorrect qualifiers",
4135 } else if (earlier
->type
!= var
->type
) {
4136 _mesa_glsl_error(&loc
, state
,
4137 "redeclaration of `%s' has incorrect type",
4141 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4148 * Generate the IR for an initializer in a variable declaration
4151 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4152 ast_fully_specified_type
*type
,
4153 exec_list
*initializer_instructions
,
4154 struct _mesa_glsl_parse_state
*state
)
4156 ir_rvalue
*result
= NULL
;
4158 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4160 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4162 * "All uniform variables are read-only and are initialized either
4163 * directly by an application via API commands, or indirectly by
4166 if (var
->data
.mode
== ir_var_uniform
) {
4167 state
->check_version(120, 0, &initializer_loc
,
4168 "cannot initialize uniform %s",
4172 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4174 * "Buffer variables cannot have initializers."
4176 if (var
->data
.mode
== ir_var_shader_storage
) {
4177 _mesa_glsl_error(&initializer_loc
, state
,
4178 "cannot initialize buffer variable %s",
4182 /* From section 4.1.7 of the GLSL 4.40 spec:
4184 * "Opaque variables [...] are initialized only through the
4185 * OpenGL API; they cannot be declared with an initializer in a
4188 if (var
->type
->contains_opaque()) {
4189 _mesa_glsl_error(&initializer_loc
, state
,
4190 "cannot initialize opaque variable %s",
4194 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4195 _mesa_glsl_error(&initializer_loc
, state
,
4196 "cannot initialize %s shader input / %s %s",
4197 _mesa_shader_stage_to_string(state
->stage
),
4198 (state
->stage
== MESA_SHADER_VERTEX
)
4199 ? "attribute" : "varying",
4203 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4204 _mesa_glsl_error(&initializer_loc
, state
,
4205 "cannot initialize %s shader output %s",
4206 _mesa_shader_stage_to_string(state
->stage
),
4210 /* If the initializer is an ast_aggregate_initializer, recursively store
4211 * type information from the LHS into it, so that its hir() function can do
4214 if (decl
->initializer
->oper
== ast_aggregate
)
4215 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4217 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4218 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4220 /* Calculate the constant value if this is a const or uniform
4223 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4225 * "Declarations of globals without a storage qualifier, or with
4226 * just the const qualifier, may include initializers, in which case
4227 * they will be initialized before the first line of main() is
4228 * executed. Such initializers must be a constant expression."
4230 * The same section of the GLSL ES 3.00.4 spec has similar language.
4232 if (type
->qualifier
.flags
.q
.constant
4233 || type
->qualifier
.flags
.q
.uniform
4234 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4235 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4237 if (new_rhs
!= NULL
) {
4240 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4243 * "A constant expression is one of
4247 * - an expression formed by an operator on operands that are
4248 * all constant expressions, including getting an element of
4249 * a constant array, or a field of a constant structure, or
4250 * components of a constant vector. However, the sequence
4251 * operator ( , ) and the assignment operators ( =, +=, ...)
4252 * are not included in the operators that can create a
4253 * constant expression."
4255 * Section 12.43 (Sequence operator and constant expressions) says:
4257 * "Should the following construct be allowed?
4261 * The expression within the brackets uses the sequence operator
4262 * (',') and returns the integer 3 so the construct is declaring
4263 * a single-dimensional array of size 3. In some languages, the
4264 * construct declares a two-dimensional array. It would be
4265 * preferable to make this construct illegal to avoid confusion.
4267 * One possibility is to change the definition of the sequence
4268 * operator so that it does not return a constant-expression and
4269 * hence cannot be used to declare an array size.
4271 * RESOLUTION: The result of a sequence operator is not a
4272 * constant-expression."
4274 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4275 * contains language almost identical to the section 4.3.3 in the
4276 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4279 ir_constant
*constant_value
= rhs
->constant_expression_value();
4280 if (!constant_value
||
4281 (state
->is_version(430, 300) &&
4282 decl
->initializer
->has_sequence_subexpression())) {
4283 const char *const variable_mode
=
4284 (type
->qualifier
.flags
.q
.constant
)
4286 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4288 /* If ARB_shading_language_420pack is enabled, initializers of
4289 * const-qualified local variables do not have to be constant
4290 * expressions. Const-qualified global variables must still be
4291 * initialized with constant expressions.
4293 if (!state
->has_420pack()
4294 || state
->current_function
== NULL
) {
4295 _mesa_glsl_error(& initializer_loc
, state
,
4296 "initializer of %s variable `%s' must be a "
4297 "constant expression",
4300 if (var
->type
->is_numeric()) {
4301 /* Reduce cascading errors. */
4302 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4303 ? ir_constant::zero(state
, var
->type
) : NULL
;
4307 rhs
= constant_value
;
4308 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4309 ? constant_value
: NULL
;
4312 if (var
->type
->is_numeric()) {
4313 /* Reduce cascading errors. */
4314 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4315 ? ir_constant::zero(state
, var
->type
) : NULL
;
4320 if (rhs
&& !rhs
->type
->is_error()) {
4321 bool temp
= var
->data
.read_only
;
4322 if (type
->qualifier
.flags
.q
.constant
)
4323 var
->data
.read_only
= false;
4325 /* Never emit code to initialize a uniform.
4327 const glsl_type
*initializer_type
;
4328 if (!type
->qualifier
.flags
.q
.uniform
) {
4329 do_assignment(initializer_instructions
, state
,
4334 type
->get_location());
4335 initializer_type
= result
->type
;
4337 initializer_type
= rhs
->type
;
4339 var
->constant_initializer
= rhs
->constant_expression_value();
4340 var
->data
.has_initializer
= true;
4342 /* If the declared variable is an unsized array, it must inherrit
4343 * its full type from the initializer. A declaration such as
4345 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4349 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4351 * The assignment generated in the if-statement (below) will also
4352 * automatically handle this case for non-uniforms.
4354 * If the declared variable is not an array, the types must
4355 * already match exactly. As a result, the type assignment
4356 * here can be done unconditionally. For non-uniforms the call
4357 * to do_assignment can change the type of the initializer (via
4358 * the implicit conversion rules). For uniforms the initializer
4359 * must be a constant expression, and the type of that expression
4360 * was validated above.
4362 var
->type
= initializer_type
;
4364 var
->data
.read_only
= temp
;
4371 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4372 YYLTYPE loc
, ir_variable
*var
,
4373 unsigned num_vertices
,
4375 const char *var_category
)
4377 if (var
->type
->is_unsized_array()) {
4378 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4380 * All geometry shader input unsized array declarations will be
4381 * sized by an earlier input layout qualifier, when present, as per
4382 * the following table.
4384 * Followed by a table mapping each allowed input layout qualifier to
4385 * the corresponding input length.
4387 * Similarly for tessellation control shader outputs.
4389 if (num_vertices
!= 0)
4390 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4393 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4394 * includes the following examples of compile-time errors:
4396 * // code sequence within one shader...
4397 * in vec4 Color1[]; // size unknown
4398 * ...Color1.length()...// illegal, length() unknown
4399 * in vec4 Color2[2]; // size is 2
4400 * ...Color1.length()...// illegal, Color1 still has no size
4401 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4402 * layout(lines) in; // legal, input size is 2, matching
4403 * in vec4 Color4[3]; // illegal, contradicts layout
4406 * To detect the case illustrated by Color3, we verify that the size of
4407 * an explicitly-sized array matches the size of any previously declared
4408 * explicitly-sized array. To detect the case illustrated by Color4, we
4409 * verify that the size of an explicitly-sized array is consistent with
4410 * any previously declared input layout.
4412 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4413 _mesa_glsl_error(&loc
, state
,
4414 "%s size contradicts previously declared layout "
4415 "(size is %u, but layout requires a size of %u)",
4416 var_category
, var
->type
->length
, num_vertices
);
4417 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4418 _mesa_glsl_error(&loc
, state
,
4419 "%s sizes are inconsistent (size is %u, but a "
4420 "previous declaration has size %u)",
4421 var_category
, var
->type
->length
, *size
);
4423 *size
= var
->type
->length
;
4429 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4430 YYLTYPE loc
, ir_variable
*var
)
4432 unsigned num_vertices
= 0;
4434 if (state
->tcs_output_vertices_specified
) {
4435 if (!state
->out_qualifier
->vertices
->
4436 process_qualifier_constant(state
, "vertices",
4437 &num_vertices
, false)) {
4441 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4442 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4443 "GL_MAX_PATCH_VERTICES", num_vertices
);
4448 if (!var
->type
->is_array() && !var
->data
.patch
) {
4449 _mesa_glsl_error(&loc
, state
,
4450 "tessellation control shader outputs must be arrays");
4452 /* To avoid cascading failures, short circuit the checks below. */
4456 if (var
->data
.patch
)
4459 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4460 &state
->tcs_output_size
,
4461 "tessellation control shader output");
4465 * Do additional processing necessary for tessellation control/evaluation shader
4466 * input declarations. This covers both interface block arrays and bare input
4470 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4471 YYLTYPE loc
, ir_variable
*var
)
4473 if (!var
->type
->is_array() && !var
->data
.patch
) {
4474 _mesa_glsl_error(&loc
, state
,
4475 "per-vertex tessellation shader inputs must be arrays");
4476 /* Avoid cascading failures. */
4480 if (var
->data
.patch
)
4483 /* The ARB_tessellation_shader spec says:
4485 * "Declaring an array size is optional. If no size is specified, it
4486 * will be taken from the implementation-dependent maximum patch size
4487 * (gl_MaxPatchVertices). If a size is specified, it must match the
4488 * maximum patch size; otherwise, a compile or link error will occur."
4490 * This text appears twice, once for TCS inputs, and again for TES inputs.
4492 if (var
->type
->is_unsized_array()) {
4493 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4494 state
->Const
.MaxPatchVertices
);
4495 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4496 _mesa_glsl_error(&loc
, state
,
4497 "per-vertex tessellation shader input arrays must be "
4498 "sized to gl_MaxPatchVertices (%d).",
4499 state
->Const
.MaxPatchVertices
);
4505 * Do additional processing necessary for geometry shader input declarations
4506 * (this covers both interface blocks arrays and bare input variables).
4509 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4510 YYLTYPE loc
, ir_variable
*var
)
4512 unsigned num_vertices
= 0;
4514 if (state
->gs_input_prim_type_specified
) {
4515 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4518 /* Geometry shader input variables must be arrays. Caller should have
4519 * reported an error for this.
4521 if (!var
->type
->is_array()) {
4522 assert(state
->error
);
4524 /* To avoid cascading failures, short circuit the checks below. */
4528 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4529 &state
->gs_input_size
,
4530 "geometry shader input");
4534 validate_identifier(const char *identifier
, YYLTYPE loc
,
4535 struct _mesa_glsl_parse_state
*state
)
4537 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4539 * "Identifiers starting with "gl_" are reserved for use by
4540 * OpenGL, and may not be declared in a shader as either a
4541 * variable or a function."
4543 if (is_gl_identifier(identifier
)) {
4544 _mesa_glsl_error(&loc
, state
,
4545 "identifier `%s' uses reserved `gl_' prefix",
4547 } else if (strstr(identifier
, "__")) {
4548 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4551 * "In addition, all identifiers containing two
4552 * consecutive underscores (__) are reserved as
4553 * possible future keywords."
4555 * The intention is that names containing __ are reserved for internal
4556 * use by the implementation, and names prefixed with GL_ are reserved
4557 * for use by Khronos. Names simply containing __ are dangerous to use,
4558 * but should be allowed.
4560 * A future version of the GLSL specification will clarify this.
4562 _mesa_glsl_warning(&loc
, state
,
4563 "identifier `%s' uses reserved `__' string",
4569 ast_declarator_list::hir(exec_list
*instructions
,
4570 struct _mesa_glsl_parse_state
*state
)
4573 const struct glsl_type
*decl_type
;
4574 const char *type_name
= NULL
;
4575 ir_rvalue
*result
= NULL
;
4576 YYLTYPE loc
= this->get_location();
4578 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4580 * "To ensure that a particular output variable is invariant, it is
4581 * necessary to use the invariant qualifier. It can either be used to
4582 * qualify a previously declared variable as being invariant
4584 * invariant gl_Position; // make existing gl_Position be invariant"
4586 * In these cases the parser will set the 'invariant' flag in the declarator
4587 * list, and the type will be NULL.
4589 if (this->invariant
) {
4590 assert(this->type
== NULL
);
4592 if (state
->current_function
!= NULL
) {
4593 _mesa_glsl_error(& loc
, state
,
4594 "all uses of `invariant' keyword must be at global "
4598 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4599 assert(decl
->array_specifier
== NULL
);
4600 assert(decl
->initializer
== NULL
);
4602 ir_variable
*const earlier
=
4603 state
->symbols
->get_variable(decl
->identifier
);
4604 if (earlier
== NULL
) {
4605 _mesa_glsl_error(& loc
, state
,
4606 "undeclared variable `%s' cannot be marked "
4607 "invariant", decl
->identifier
);
4608 } else if (!is_allowed_invariant(earlier
, state
)) {
4609 _mesa_glsl_error(&loc
, state
,
4610 "`%s' cannot be marked invariant; interfaces between "
4611 "shader stages only.", decl
->identifier
);
4612 } else if (earlier
->data
.used
) {
4613 _mesa_glsl_error(& loc
, state
,
4614 "variable `%s' may not be redeclared "
4615 "`invariant' after being used",
4618 earlier
->data
.invariant
= true;
4622 /* Invariant redeclarations do not have r-values.
4627 if (this->precise
) {
4628 assert(this->type
== NULL
);
4630 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4631 assert(decl
->array_specifier
== NULL
);
4632 assert(decl
->initializer
== NULL
);
4634 ir_variable
*const earlier
=
4635 state
->symbols
->get_variable(decl
->identifier
);
4636 if (earlier
== NULL
) {
4637 _mesa_glsl_error(& loc
, state
,
4638 "undeclared variable `%s' cannot be marked "
4639 "precise", decl
->identifier
);
4640 } else if (state
->current_function
!= NULL
&&
4641 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4642 /* Note: we have to check if we're in a function, since
4643 * builtins are treated as having come from another scope.
4645 _mesa_glsl_error(& loc
, state
,
4646 "variable `%s' from an outer scope may not be "
4647 "redeclared `precise' in this scope",
4649 } else if (earlier
->data
.used
) {
4650 _mesa_glsl_error(& loc
, state
,
4651 "variable `%s' may not be redeclared "
4652 "`precise' after being used",
4655 earlier
->data
.precise
= true;
4659 /* Precise redeclarations do not have r-values either. */
4663 assert(this->type
!= NULL
);
4664 assert(!this->invariant
);
4665 assert(!this->precise
);
4667 /* The type specifier may contain a structure definition. Process that
4668 * before any of the variable declarations.
4670 (void) this->type
->specifier
->hir(instructions
, state
);
4672 decl_type
= this->type
->glsl_type(& type_name
, state
);
4674 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4675 * "Buffer variables may only be declared inside interface blocks
4676 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4677 * shader storage blocks. It is a compile-time error to declare buffer
4678 * variables at global scope (outside a block)."
4680 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4681 _mesa_glsl_error(&loc
, state
,
4682 "buffer variables cannot be declared outside "
4683 "interface blocks");
4686 /* An offset-qualified atomic counter declaration sets the default
4687 * offset for the next declaration within the same atomic counter
4690 if (decl_type
&& decl_type
->contains_atomic()) {
4691 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4692 type
->qualifier
.flags
.q
.explicit_offset
) {
4693 unsigned qual_binding
;
4694 unsigned qual_offset
;
4695 if (process_qualifier_constant(state
, &loc
, "binding",
4696 type
->qualifier
.binding
,
4698 && process_qualifier_constant(state
, &loc
, "offset",
4699 type
->qualifier
.offset
,
4701 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4705 ast_type_qualifier allowed_atomic_qual_mask
;
4706 allowed_atomic_qual_mask
.flags
.i
= 0;
4707 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4708 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4709 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4711 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4712 "invalid layout qualifier for",
4716 if (this->declarations
.is_empty()) {
4717 /* If there is no structure involved in the program text, there are two
4718 * possible scenarios:
4720 * - The program text contained something like 'vec4;'. This is an
4721 * empty declaration. It is valid but weird. Emit a warning.
4723 * - The program text contained something like 'S;' and 'S' is not the
4724 * name of a known structure type. This is both invalid and weird.
4727 * - The program text contained something like 'mediump float;'
4728 * when the programmer probably meant 'precision mediump
4729 * float;' Emit a warning with a description of what they
4730 * probably meant to do.
4732 * Note that if decl_type is NULL and there is a structure involved,
4733 * there must have been some sort of error with the structure. In this
4734 * case we assume that an error was already generated on this line of
4735 * code for the structure. There is no need to generate an additional,
4738 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4741 if (decl_type
== NULL
) {
4742 _mesa_glsl_error(&loc
, state
,
4743 "invalid type `%s' in empty declaration",
4746 if (decl_type
->is_array()) {
4747 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4750 * "... any declaration that leaves the size undefined is
4751 * disallowed as this would add complexity and there are no
4754 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4755 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4756 "or implicitly defined");
4759 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4761 * "The combinations of types and qualifiers that cause
4762 * compile-time or link-time errors are the same whether or not
4763 * the declaration is empty."
4765 validate_array_dimensions(decl_type
, state
, &loc
);
4768 if (decl_type
->is_atomic_uint()) {
4769 /* Empty atomic counter declarations are allowed and useful
4770 * to set the default offset qualifier.
4773 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4774 if (this->type
->specifier
->structure
!= NULL
) {
4775 _mesa_glsl_error(&loc
, state
,
4776 "precision qualifiers can't be applied "
4779 static const char *const precision_names
[] = {
4786 _mesa_glsl_warning(&loc
, state
,
4787 "empty declaration with precision "
4788 "qualifier, to set the default precision, "
4789 "use `precision %s %s;'",
4790 precision_names
[this->type
->
4791 qualifier
.precision
],
4794 } else if (this->type
->specifier
->structure
== NULL
) {
4795 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4800 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4801 const struct glsl_type
*var_type
;
4803 const char *identifier
= decl
->identifier
;
4804 /* FINISHME: Emit a warning if a variable declaration shadows a
4805 * FINISHME: declaration at a higher scope.
4808 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4809 if (type_name
!= NULL
) {
4810 _mesa_glsl_error(& loc
, state
,
4811 "invalid type `%s' in declaration of `%s'",
4812 type_name
, decl
->identifier
);
4814 _mesa_glsl_error(& loc
, state
,
4815 "invalid type in declaration of `%s'",
4821 if (this->type
->qualifier
.is_subroutine_decl()) {
4825 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4827 _mesa_glsl_error(& loc
, state
,
4828 "invalid type in declaration of `%s'",
4830 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4835 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4838 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4840 /* The 'varying in' and 'varying out' qualifiers can only be used with
4841 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4844 if (this->type
->qualifier
.flags
.q
.varying
) {
4845 if (this->type
->qualifier
.flags
.q
.in
) {
4846 _mesa_glsl_error(& loc
, state
,
4847 "`varying in' qualifier in declaration of "
4848 "`%s' only valid for geometry shaders using "
4849 "ARB_geometry_shader4 or EXT_geometry_shader4",
4851 } else if (this->type
->qualifier
.flags
.q
.out
) {
4852 _mesa_glsl_error(& loc
, state
,
4853 "`varying out' qualifier in declaration of "
4854 "`%s' only valid for geometry shaders using "
4855 "ARB_geometry_shader4 or EXT_geometry_shader4",
4860 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4862 * "Global variables can only use the qualifiers const,
4863 * attribute, uniform, or varying. Only one may be
4866 * Local variables can only use the qualifier const."
4868 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4869 * any extension that adds the 'layout' keyword.
4871 if (!state
->is_version(130, 300)
4872 && !state
->has_explicit_attrib_location()
4873 && !state
->has_separate_shader_objects()
4874 && !state
->ARB_fragment_coord_conventions_enable
) {
4875 if (this->type
->qualifier
.flags
.q
.out
) {
4876 _mesa_glsl_error(& loc
, state
,
4877 "`out' qualifier in declaration of `%s' "
4878 "only valid for function parameters in %s",
4879 decl
->identifier
, state
->get_version_string());
4881 if (this->type
->qualifier
.flags
.q
.in
) {
4882 _mesa_glsl_error(& loc
, state
,
4883 "`in' qualifier in declaration of `%s' "
4884 "only valid for function parameters in %s",
4885 decl
->identifier
, state
->get_version_string());
4887 /* FINISHME: Test for other invalid qualifiers. */
4890 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4892 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4895 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
4896 && (var
->type
->is_numeric() || var
->type
->is_boolean())
4897 && state
->zero_init
) {
4898 const ir_constant_data data
= { { 0 } };
4899 var
->data
.has_initializer
= true;
4900 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
4903 if (this->type
->qualifier
.flags
.q
.invariant
) {
4904 if (!is_allowed_invariant(var
, state
)) {
4905 _mesa_glsl_error(&loc
, state
,
4906 "`%s' cannot be marked invariant; interfaces between "
4907 "shader stages only", var
->name
);
4911 if (state
->current_function
!= NULL
) {
4912 const char *mode
= NULL
;
4913 const char *extra
= "";
4915 /* There is no need to check for 'inout' here because the parser will
4916 * only allow that in function parameter lists.
4918 if (this->type
->qualifier
.flags
.q
.attribute
) {
4920 } else if (this->type
->qualifier
.is_subroutine_decl()) {
4921 mode
= "subroutine uniform";
4922 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4924 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4926 } else if (this->type
->qualifier
.flags
.q
.in
) {
4928 extra
= " or in function parameter list";
4929 } else if (this->type
->qualifier
.flags
.q
.out
) {
4931 extra
= " or in function parameter list";
4935 _mesa_glsl_error(& loc
, state
,
4936 "%s variable `%s' must be declared at "
4938 mode
, var
->name
, extra
);
4940 } else if (var
->data
.mode
== ir_var_shader_in
) {
4941 var
->data
.read_only
= true;
4943 if (state
->stage
== MESA_SHADER_VERTEX
) {
4944 bool error_emitted
= false;
4946 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4948 * "Vertex shader inputs can only be float, floating-point
4949 * vectors, matrices, signed and unsigned integers and integer
4950 * vectors. Vertex shader inputs can also form arrays of these
4951 * types, but not structures."
4953 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4955 * "Vertex shader inputs can only be float, floating-point
4956 * vectors, matrices, signed and unsigned integers and integer
4957 * vectors. They cannot be arrays or structures."
4959 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4961 * "The attribute qualifier can be used only with float,
4962 * floating-point vectors, and matrices. Attribute variables
4963 * cannot be declared as arrays or structures."
4965 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4967 * "Vertex shader inputs can only be float, floating-point
4968 * vectors, matrices, signed and unsigned integers and integer
4969 * vectors. Vertex shader inputs cannot be arrays or
4972 const glsl_type
*check_type
= var
->type
->without_array();
4974 switch (check_type
->base_type
) {
4975 case GLSL_TYPE_FLOAT
:
4977 case GLSL_TYPE_UINT64
:
4978 case GLSL_TYPE_INT64
:
4980 case GLSL_TYPE_UINT
:
4982 if (state
->is_version(120, 300))
4984 case GLSL_TYPE_DOUBLE
:
4985 if (check_type
->is_double() && (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4989 _mesa_glsl_error(& loc
, state
,
4990 "vertex shader input / attribute cannot have "
4992 var
->type
->is_array() ? "array of " : "",
4994 error_emitted
= true;
4997 if (!error_emitted
&& var
->type
->is_array() &&
4998 !state
->check_version(150, 0, &loc
,
4999 "vertex shader input / attribute "
5000 "cannot have array type")) {
5001 error_emitted
= true;
5003 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
5004 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5006 * Geometry shader input variables get the per-vertex values
5007 * written out by vertex shader output variables of the same
5008 * names. Since a geometry shader operates on a set of
5009 * vertices, each input varying variable (or input block, see
5010 * interface blocks below) needs to be declared as an array.
5012 if (!var
->type
->is_array()) {
5013 _mesa_glsl_error(&loc
, state
,
5014 "geometry shader inputs must be arrays");
5017 handle_geometry_shader_input_decl(state
, loc
, var
);
5018 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5019 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
5021 * It is a compile-time error to declare a fragment shader
5022 * input with, or that contains, any of the following types:
5026 * * An array of arrays
5027 * * An array of structures
5028 * * A structure containing an array
5029 * * A structure containing a structure
5031 if (state
->es_shader
) {
5032 const glsl_type
*check_type
= var
->type
->without_array();
5033 if (check_type
->is_boolean() ||
5034 check_type
->contains_opaque()) {
5035 _mesa_glsl_error(&loc
, state
,
5036 "fragment shader input cannot have type %s",
5039 if (var
->type
->is_array() &&
5040 var
->type
->fields
.array
->is_array()) {
5041 _mesa_glsl_error(&loc
, state
,
5043 "cannot have an array of arrays",
5044 _mesa_shader_stage_to_string(state
->stage
));
5046 if (var
->type
->is_array() &&
5047 var
->type
->fields
.array
->is_record()) {
5048 _mesa_glsl_error(&loc
, state
,
5049 "fragment shader input "
5050 "cannot have an array of structs");
5052 if (var
->type
->is_record()) {
5053 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5054 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5055 var
->type
->fields
.structure
[i
].type
->is_record())
5056 _mesa_glsl_error(&loc
, state
,
5057 "fragement shader input cannot have "
5058 "a struct that contains an "
5063 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5064 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5065 handle_tess_shader_input_decl(state
, loc
, var
);
5067 } else if (var
->data
.mode
== ir_var_shader_out
) {
5068 const glsl_type
*check_type
= var
->type
->without_array();
5070 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5072 * It is a compile-time error to declare a fragment shader output
5073 * that contains any of the following:
5075 * * A Boolean type (bool, bvec2 ...)
5076 * * A double-precision scalar or vector (double, dvec2 ...)
5081 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5082 if (check_type
->is_record() || check_type
->is_matrix())
5083 _mesa_glsl_error(&loc
, state
,
5084 "fragment shader output "
5085 "cannot have struct or matrix type");
5086 switch (check_type
->base_type
) {
5087 case GLSL_TYPE_UINT
:
5089 case GLSL_TYPE_FLOAT
:
5092 _mesa_glsl_error(&loc
, state
,
5093 "fragment shader output cannot have "
5094 "type %s", check_type
->name
);
5098 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5100 * It is a compile-time error to declare a vertex shader output
5101 * with, or that contains, any of the following types:
5105 * * An array of arrays
5106 * * An array of structures
5107 * * A structure containing an array
5108 * * A structure containing a structure
5110 * It is a compile-time error to declare a fragment shader output
5111 * with, or that contains, any of the following types:
5117 * * An array of array
5119 * ES 3.20 updates this to apply to tessellation and geometry shaders
5120 * as well. Because there are per-vertex arrays in the new stages,
5121 * it strikes the "array of..." rules and replaces them with these:
5123 * * For per-vertex-arrayed variables (applies to tessellation
5124 * control, tessellation evaluation and geometry shaders):
5126 * * Per-vertex-arrayed arrays of arrays
5127 * * Per-vertex-arrayed arrays of structures
5129 * * For non-per-vertex-arrayed variables:
5131 * * An array of arrays
5132 * * An array of structures
5134 * which basically says to unwrap the per-vertex aspect and apply
5137 if (state
->es_shader
) {
5138 if (var
->type
->is_array() &&
5139 var
->type
->fields
.array
->is_array()) {
5140 _mesa_glsl_error(&loc
, state
,
5142 "cannot have an array of arrays",
5143 _mesa_shader_stage_to_string(state
->stage
));
5145 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5146 const glsl_type
*type
= var
->type
;
5148 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5149 !var
->data
.patch
&& var
->type
->is_array()) {
5150 type
= var
->type
->fields
.array
;
5153 if (type
->is_array() && type
->fields
.array
->is_record()) {
5154 _mesa_glsl_error(&loc
, state
,
5155 "%s shader output cannot have "
5156 "an array of structs",
5157 _mesa_shader_stage_to_string(state
->stage
));
5159 if (type
->is_record()) {
5160 for (unsigned i
= 0; i
< type
->length
; i
++) {
5161 if (type
->fields
.structure
[i
].type
->is_array() ||
5162 type
->fields
.structure
[i
].type
->is_record())
5163 _mesa_glsl_error(&loc
, state
,
5164 "%s shader output cannot have a "
5165 "struct that contains an "
5167 _mesa_shader_stage_to_string(state
->stage
));
5173 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5174 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5176 } else if (var
->type
->contains_subroutine()) {
5177 /* declare subroutine uniforms as hidden */
5178 var
->data
.how_declared
= ir_var_hidden
;
5181 /* From section 4.3.4 of the GLSL 4.00 spec:
5182 * "Input variables may not be declared using the patch in qualifier
5183 * in tessellation control or geometry shaders."
5185 * From section 4.3.6 of the GLSL 4.00 spec:
5186 * "It is an error to use patch out in a vertex, tessellation
5187 * evaluation, or geometry shader."
5189 * This doesn't explicitly forbid using them in a fragment shader, but
5190 * that's probably just an oversight.
5192 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5193 && this->type
->qualifier
.flags
.q
.patch
5194 && this->type
->qualifier
.flags
.q
.in
) {
5196 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5197 "tessellation evaluation shader");
5200 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5201 && this->type
->qualifier
.flags
.q
.patch
5202 && this->type
->qualifier
.flags
.q
.out
) {
5204 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5205 "tessellation control shader");
5208 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5210 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5211 state
->check_precision_qualifiers_allowed(&loc
);
5214 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5215 !precision_qualifier_allowed(var
->type
)) {
5216 _mesa_glsl_error(&loc
, state
,
5217 "precision qualifiers apply only to floating point"
5218 ", integer and opaque types");
5221 /* From section 4.1.7 of the GLSL 4.40 spec:
5223 * "[Opaque types] can only be declared as function
5224 * parameters or uniform-qualified variables."
5226 if (var_type
->contains_opaque() &&
5227 !this->type
->qualifier
.flags
.q
.uniform
) {
5228 _mesa_glsl_error(&loc
, state
,
5229 "opaque variables must be declared uniform");
5232 /* Process the initializer and add its instructions to a temporary
5233 * list. This list will be added to the instruction stream (below) after
5234 * the declaration is added. This is done because in some cases (such as
5235 * redeclarations) the declaration may not actually be added to the
5236 * instruction stream.
5238 exec_list initializer_instructions
;
5240 /* Examine var name here since var may get deleted in the next call */
5241 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5243 bool is_redeclaration
;
5244 ir_variable
*declared_var
=
5245 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5246 false /* allow_all_redeclarations */,
5248 if (is_redeclaration
) {
5250 declared_var
->data
.how_declared
== ir_var_declared_in_block
) {
5251 _mesa_glsl_error(&loc
, state
,
5252 "`%s' has already been redeclared using "
5253 "gl_PerVertex", declared_var
->name
);
5255 declared_var
->data
.how_declared
= ir_var_declared_normally
;
5258 if (decl
->initializer
!= NULL
) {
5259 result
= process_initializer(declared_var
,
5261 &initializer_instructions
, state
);
5263 validate_array_dimensions(var_type
, state
, &loc
);
5266 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5268 * "It is an error to write to a const variable outside of
5269 * its declaration, so they must be initialized when
5272 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5273 _mesa_glsl_error(& loc
, state
,
5274 "const declaration of `%s' must be initialized",
5278 if (state
->es_shader
) {
5279 const glsl_type
*const t
= declared_var
->type
;
5281 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5283 * The GL_OES_tessellation_shader spec says about inputs:
5285 * "Declaring an array size is optional. If no size is specified,
5286 * it will be taken from the implementation-dependent maximum
5287 * patch size (gl_MaxPatchVertices)."
5289 * and about TCS outputs:
5291 * "If no size is specified, it will be taken from output patch
5292 * size declared in the shader."
5294 * The GL_OES_geometry_shader spec says:
5296 * "All geometry shader input unsized array declarations will be
5297 * sized by an earlier input primitive layout qualifier, when
5298 * present, as per the following table."
5300 const bool implicitly_sized
=
5301 (declared_var
->data
.mode
== ir_var_shader_in
&&
5302 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5303 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5304 (declared_var
->data
.mode
== ir_var_shader_out
&&
5305 state
->stage
== MESA_SHADER_TESS_CTRL
);
5307 if (t
->is_unsized_array() && !implicitly_sized
)
5308 /* Section 10.17 of the GLSL ES 1.00 specification states that
5309 * unsized array declarations have been removed from the language.
5310 * Arrays that are sized using an initializer are still explicitly
5311 * sized. However, GLSL ES 1.00 does not allow array
5312 * initializers. That is only allowed in GLSL ES 3.00.
5314 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5316 * "An array type can also be formed without specifying a size
5317 * if the definition includes an initializer:
5319 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5320 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5325 _mesa_glsl_error(& loc
, state
,
5326 "unsized array declarations are not allowed in "
5330 /* If the declaration is not a redeclaration, there are a few additional
5331 * semantic checks that must be applied. In addition, variable that was
5332 * created for the declaration should be added to the IR stream.
5334 if (!is_redeclaration
) {
5335 validate_identifier(decl
->identifier
, loc
, state
);
5337 /* Add the variable to the symbol table. Note that the initializer's
5338 * IR was already processed earlier (though it hasn't been emitted
5339 * yet), without the variable in scope.
5341 * This differs from most C-like languages, but it follows the GLSL
5342 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5345 * "Within a declaration, the scope of a name starts immediately
5346 * after the initializer if present or immediately after the name
5347 * being declared if not."
5349 if (!state
->symbols
->add_variable(declared_var
)) {
5350 YYLTYPE loc
= this->get_location();
5351 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5352 "current scope", decl
->identifier
);
5356 /* Push the variable declaration to the top. It means that all the
5357 * variable declarations will appear in a funny last-to-first order,
5358 * but otherwise we run into trouble if a function is prototyped, a
5359 * global var is decled, then the function is defined with usage of
5360 * the global var. See glslparsertest's CorrectModule.frag.
5362 instructions
->push_head(declared_var
);
5365 instructions
->append_list(&initializer_instructions
);
5369 /* Generally, variable declarations do not have r-values. However,
5370 * one is used for the declaration in
5372 * while (bool b = some_condition()) {
5376 * so we return the rvalue from the last seen declaration here.
5383 ast_parameter_declarator::hir(exec_list
*instructions
,
5384 struct _mesa_glsl_parse_state
*state
)
5387 const struct glsl_type
*type
;
5388 const char *name
= NULL
;
5389 YYLTYPE loc
= this->get_location();
5391 type
= this->type
->glsl_type(& name
, state
);
5395 _mesa_glsl_error(& loc
, state
,
5396 "invalid type `%s' in declaration of `%s'",
5397 name
, this->identifier
);
5399 _mesa_glsl_error(& loc
, state
,
5400 "invalid type in declaration of `%s'",
5404 type
= glsl_type::error_type
;
5407 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5409 * "Functions that accept no input arguments need not use void in the
5410 * argument list because prototypes (or definitions) are required and
5411 * therefore there is no ambiguity when an empty argument list "( )" is
5412 * declared. The idiom "(void)" as a parameter list is provided for
5415 * Placing this check here prevents a void parameter being set up
5416 * for a function, which avoids tripping up checks for main taking
5417 * parameters and lookups of an unnamed symbol.
5419 if (type
->is_void()) {
5420 if (this->identifier
!= NULL
)
5421 _mesa_glsl_error(& loc
, state
,
5422 "named parameter cannot have type `void'");
5428 if (formal_parameter
&& (this->identifier
== NULL
)) {
5429 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5433 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5434 * call already handled the "vec4[..] foo" case.
5436 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5438 if (!type
->is_error() && type
->is_unsized_array()) {
5439 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5441 type
= glsl_type::error_type
;
5445 ir_variable
*var
= new(ctx
)
5446 ir_variable(type
, this->identifier
, ir_var_function_in
);
5448 /* Apply any specified qualifiers to the parameter declaration. Note that
5449 * for function parameters the default mode is 'in'.
5451 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5454 /* From section 4.1.7 of the GLSL 4.40 spec:
5456 * "Opaque variables cannot be treated as l-values; hence cannot
5457 * be used as out or inout function parameters, nor can they be
5460 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5461 && type
->contains_opaque()) {
5462 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5463 "contain opaque variables");
5464 type
= glsl_type::error_type
;
5467 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5469 * "When calling a function, expressions that do not evaluate to
5470 * l-values cannot be passed to parameters declared as out or inout."
5472 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5474 * "Other binary or unary expressions, non-dereferenced arrays,
5475 * function names, swizzles with repeated fields, and constants
5476 * cannot be l-values."
5478 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5479 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5481 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5483 && !state
->check_version(120, 100, &loc
,
5484 "arrays cannot be out or inout parameters")) {
5485 type
= glsl_type::error_type
;
5488 instructions
->push_tail(var
);
5490 /* Parameter declarations do not have r-values.
5497 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5499 exec_list
*ir_parameters
,
5500 _mesa_glsl_parse_state
*state
)
5502 ast_parameter_declarator
*void_param
= NULL
;
5505 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5506 param
->formal_parameter
= formal
;
5507 param
->hir(ir_parameters
, state
);
5515 if ((void_param
!= NULL
) && (count
> 1)) {
5516 YYLTYPE loc
= void_param
->get_location();
5518 _mesa_glsl_error(& loc
, state
,
5519 "`void' parameter must be only parameter");
5525 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5527 /* IR invariants disallow function declarations or definitions
5528 * nested within other function definitions. But there is no
5529 * requirement about the relative order of function declarations
5530 * and definitions with respect to one another. So simply insert
5531 * the new ir_function block at the end of the toplevel instruction
5534 state
->toplevel_ir
->push_tail(f
);
5539 ast_function::hir(exec_list
*instructions
,
5540 struct _mesa_glsl_parse_state
*state
)
5543 ir_function
*f
= NULL
;
5544 ir_function_signature
*sig
= NULL
;
5545 exec_list hir_parameters
;
5546 YYLTYPE loc
= this->get_location();
5548 const char *const name
= identifier
;
5550 /* New functions are always added to the top-level IR instruction stream,
5551 * so this instruction list pointer is ignored. See also emit_function
5554 (void) instructions
;
5556 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5558 * "Function declarations (prototypes) cannot occur inside of functions;
5559 * they must be at global scope, or for the built-in functions, outside
5560 * the global scope."
5562 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5564 * "User defined functions may only be defined within the global scope."
5566 * Note that this language does not appear in GLSL 1.10.
5568 if ((state
->current_function
!= NULL
) &&
5569 state
->is_version(120, 100)) {
5570 YYLTYPE loc
= this->get_location();
5571 _mesa_glsl_error(&loc
, state
,
5572 "declaration of function `%s' not allowed within "
5573 "function body", name
);
5576 validate_identifier(name
, this->get_location(), state
);
5578 /* Convert the list of function parameters to HIR now so that they can be
5579 * used below to compare this function's signature with previously seen
5580 * signatures for functions with the same name.
5582 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5584 & hir_parameters
, state
);
5586 const char *return_type_name
;
5587 const glsl_type
*return_type
=
5588 this->return_type
->glsl_type(& return_type_name
, state
);
5591 YYLTYPE loc
= this->get_location();
5592 _mesa_glsl_error(&loc
, state
,
5593 "function `%s' has undeclared return type `%s'",
5594 name
, return_type_name
);
5595 return_type
= glsl_type::error_type
;
5598 /* ARB_shader_subroutine states:
5599 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5600 * subroutine(...) to a function declaration."
5602 if (this->return_type
->qualifier
.subroutine_list
&& !is_definition
) {
5603 YYLTYPE loc
= this->get_location();
5604 _mesa_glsl_error(&loc
, state
,
5605 "function declaration `%s' cannot have subroutine prepended",
5609 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5610 * "No qualifier is allowed on the return type of a function."
5612 if (this->return_type
->has_qualifiers(state
)) {
5613 YYLTYPE loc
= this->get_location();
5614 _mesa_glsl_error(& loc
, state
,
5615 "function `%s' return type has qualifiers", name
);
5618 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5620 * "Arrays are allowed as arguments and as the return type. In both
5621 * cases, the array must be explicitly sized."
5623 if (return_type
->is_unsized_array()) {
5624 YYLTYPE loc
= this->get_location();
5625 _mesa_glsl_error(& loc
, state
,
5626 "function `%s' return type array must be explicitly "
5630 /* From section 4.1.7 of the GLSL 4.40 spec:
5632 * "[Opaque types] can only be declared as function parameters
5633 * or uniform-qualified variables."
5635 if (return_type
->contains_opaque()) {
5636 YYLTYPE loc
= this->get_location();
5637 _mesa_glsl_error(&loc
, state
,
5638 "function `%s' return type can't contain an opaque type",
5643 if (return_type
->is_subroutine()) {
5644 YYLTYPE loc
= this->get_location();
5645 _mesa_glsl_error(&loc
, state
,
5646 "function `%s' return type can't be a subroutine type",
5651 /* Create an ir_function if one doesn't already exist. */
5652 f
= state
->symbols
->get_function(name
);
5654 f
= new(ctx
) ir_function(name
);
5655 if (!this->return_type
->qualifier
.is_subroutine_decl()) {
5656 if (!state
->symbols
->add_function(f
)) {
5657 /* This function name shadows a non-function use of the same name. */
5658 YYLTYPE loc
= this->get_location();
5659 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5660 "non-function", name
);
5664 emit_function(state
, f
);
5667 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5669 * "A shader cannot redefine or overload built-in functions."
5671 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5673 * "User code can overload the built-in functions but cannot redefine
5676 if (state
->es_shader
&& state
->language_version
>= 300) {
5677 /* Local shader has no exact candidates; check the built-ins. */
5678 _mesa_glsl_initialize_builtin_functions();
5679 if (_mesa_glsl_has_builtin_function(name
)) {
5680 YYLTYPE loc
= this->get_location();
5681 _mesa_glsl_error(& loc
, state
,
5682 "A shader cannot redefine or overload built-in "
5683 "function `%s' in GLSL ES 3.00", name
);
5688 /* Verify that this function's signature either doesn't match a previously
5689 * seen signature for a function with the same name, or, if a match is found,
5690 * that the previously seen signature does not have an associated definition.
5692 if (state
->es_shader
|| f
->has_user_signature()) {
5693 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5695 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5696 if (badvar
!= NULL
) {
5697 YYLTYPE loc
= this->get_location();
5699 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5700 "qualifiers don't match prototype", name
, badvar
);
5703 if (sig
->return_type
!= return_type
) {
5704 YYLTYPE loc
= this->get_location();
5706 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5707 "match prototype", name
);
5710 if (sig
->is_defined
) {
5711 if (is_definition
) {
5712 YYLTYPE loc
= this->get_location();
5713 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5715 /* We just encountered a prototype that exactly matches a
5716 * function that's already been defined. This is redundant,
5717 * and we should ignore it.
5725 /* Verify the return type of main() */
5726 if (strcmp(name
, "main") == 0) {
5727 if (! return_type
->is_void()) {
5728 YYLTYPE loc
= this->get_location();
5730 _mesa_glsl_error(& loc
, state
, "main() must return void");
5733 if (!hir_parameters
.is_empty()) {
5734 YYLTYPE loc
= this->get_location();
5736 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5740 /* Finish storing the information about this new function in its signature.
5743 sig
= new(ctx
) ir_function_signature(return_type
);
5744 f
->add_signature(sig
);
5747 sig
->replace_parameters(&hir_parameters
);
5750 if (this->return_type
->qualifier
.subroutine_list
) {
5753 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5754 unsigned qual_index
;
5755 if (process_qualifier_constant(state
, &loc
, "index",
5756 this->return_type
->qualifier
.index
,
5758 if (!state
->has_explicit_uniform_location()) {
5759 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5760 "GL_ARB_explicit_uniform_location or "
5762 } else if (qual_index
>= MAX_SUBROUTINES
) {
5763 _mesa_glsl_error(&loc
, state
,
5764 "invalid subroutine index (%d) index must "
5765 "be a number between 0 and "
5766 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5767 MAX_SUBROUTINES
- 1);
5769 f
->subroutine_index
= qual_index
;
5774 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5775 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5776 f
->num_subroutine_types
);
5778 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5779 const struct glsl_type
*type
;
5780 /* the subroutine type must be already declared */
5781 type
= state
->symbols
->get_type(decl
->identifier
);
5783 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5786 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5787 ir_function
*fn
= state
->subroutine_types
[i
];
5788 ir_function_signature
*tsig
= NULL
;
5790 if (strcmp(fn
->name
, decl
->identifier
))
5793 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5796 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5798 if (tsig
->return_type
!= sig
->return_type
) {
5799 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5803 f
->subroutine_types
[idx
++] = type
;
5805 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5807 state
->num_subroutines
+ 1);
5808 state
->subroutines
[state
->num_subroutines
] = f
;
5809 state
->num_subroutines
++;
5813 if (this->return_type
->qualifier
.is_subroutine_decl()) {
5814 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5815 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5818 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5820 state
->num_subroutine_types
+ 1);
5821 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5822 state
->num_subroutine_types
++;
5824 f
->is_subroutine
= true;
5827 /* Function declarations (prototypes) do not have r-values.
5834 ast_function_definition::hir(exec_list
*instructions
,
5835 struct _mesa_glsl_parse_state
*state
)
5837 prototype
->is_definition
= true;
5838 prototype
->hir(instructions
, state
);
5840 ir_function_signature
*signature
= prototype
->signature
;
5841 if (signature
== NULL
)
5844 assert(state
->current_function
== NULL
);
5845 state
->current_function
= signature
;
5846 state
->found_return
= false;
5848 /* Duplicate parameters declared in the prototype as concrete variables.
5849 * Add these to the symbol table.
5851 state
->symbols
->push_scope();
5852 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5853 assert(var
->as_variable() != NULL
);
5855 /* The only way a parameter would "exist" is if two parameters have
5858 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5859 YYLTYPE loc
= this->get_location();
5861 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5863 state
->symbols
->add_variable(var
);
5867 /* Convert the body of the function to HIR. */
5868 this->body
->hir(&signature
->body
, state
);
5869 signature
->is_defined
= true;
5871 state
->symbols
->pop_scope();
5873 assert(state
->current_function
== signature
);
5874 state
->current_function
= NULL
;
5876 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5877 YYLTYPE loc
= this->get_location();
5878 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5879 "%s, but no return statement",
5880 signature
->function_name(),
5881 signature
->return_type
->name
);
5884 /* Function definitions do not have r-values.
5891 ast_jump_statement::hir(exec_list
*instructions
,
5892 struct _mesa_glsl_parse_state
*state
)
5899 assert(state
->current_function
);
5901 if (opt_return_value
) {
5902 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5904 /* The value of the return type can be NULL if the shader says
5905 * 'return foo();' and foo() is a function that returns void.
5907 * NOTE: The GLSL spec doesn't say that this is an error. The type
5908 * of the return value is void. If the return type of the function is
5909 * also void, then this should compile without error. Seriously.
5911 const glsl_type
*const ret_type
=
5912 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5914 /* Implicit conversions are not allowed for return values prior to
5915 * ARB_shading_language_420pack.
5917 if (state
->current_function
->return_type
!= ret_type
) {
5918 YYLTYPE loc
= this->get_location();
5920 if (state
->has_420pack()) {
5921 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5923 _mesa_glsl_error(& loc
, state
,
5924 "could not implicitly convert return value "
5925 "to %s, in function `%s'",
5926 state
->current_function
->return_type
->name
,
5927 state
->current_function
->function_name());
5930 _mesa_glsl_error(& loc
, state
,
5931 "`return' with wrong type %s, in function `%s' "
5934 state
->current_function
->function_name(),
5935 state
->current_function
->return_type
->name
);
5937 } else if (state
->current_function
->return_type
->base_type
==
5939 YYLTYPE loc
= this->get_location();
5941 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5942 * specs add a clarification:
5944 * "A void function can only use return without a return argument, even if
5945 * the return argument has void type. Return statements only accept values:
5948 * void func2() { return func1(); } // illegal return statement"
5950 _mesa_glsl_error(& loc
, state
,
5951 "void functions can only use `return' without a "
5955 inst
= new(ctx
) ir_return(ret
);
5957 if (state
->current_function
->return_type
->base_type
!=
5959 YYLTYPE loc
= this->get_location();
5961 _mesa_glsl_error(& loc
, state
,
5962 "`return' with no value, in function %s returning "
5964 state
->current_function
->function_name());
5966 inst
= new(ctx
) ir_return
;
5969 state
->found_return
= true;
5970 instructions
->push_tail(inst
);
5975 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5976 YYLTYPE loc
= this->get_location();
5978 _mesa_glsl_error(& loc
, state
,
5979 "`discard' may only appear in a fragment shader");
5981 instructions
->push_tail(new(ctx
) ir_discard
);
5986 if (mode
== ast_continue
&&
5987 state
->loop_nesting_ast
== NULL
) {
5988 YYLTYPE loc
= this->get_location();
5990 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5991 } else if (mode
== ast_break
&&
5992 state
->loop_nesting_ast
== NULL
&&
5993 state
->switch_state
.switch_nesting_ast
== NULL
) {
5994 YYLTYPE loc
= this->get_location();
5996 _mesa_glsl_error(& loc
, state
,
5997 "break may only appear in a loop or a switch");
5999 /* For a loop, inline the for loop expression again, since we don't
6000 * know where near the end of the loop body the normal copy of it is
6001 * going to be placed. Same goes for the condition for a do-while
6004 if (state
->loop_nesting_ast
!= NULL
&&
6005 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
6006 if (state
->loop_nesting_ast
->rest_expression
) {
6007 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
6010 if (state
->loop_nesting_ast
->mode
==
6011 ast_iteration_statement::ast_do_while
) {
6012 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
6016 if (state
->switch_state
.is_switch_innermost
&&
6017 mode
== ast_continue
) {
6018 /* Set 'continue_inside' to true. */
6019 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
6020 ir_dereference_variable
*deref_continue_inside_var
=
6021 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6022 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6025 /* Break out from the switch, continue for the loop will
6026 * be called right after switch. */
6027 ir_loop_jump
*const jump
=
6028 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6029 instructions
->push_tail(jump
);
6031 } else if (state
->switch_state
.is_switch_innermost
&&
6032 mode
== ast_break
) {
6033 /* Force break out of switch by inserting a break. */
6034 ir_loop_jump
*const jump
=
6035 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6036 instructions
->push_tail(jump
);
6038 ir_loop_jump
*const jump
=
6039 new(ctx
) ir_loop_jump((mode
== ast_break
)
6040 ? ir_loop_jump::jump_break
6041 : ir_loop_jump::jump_continue
);
6042 instructions
->push_tail(jump
);
6049 /* Jump instructions do not have r-values.
6056 ast_selection_statement::hir(exec_list
*instructions
,
6057 struct _mesa_glsl_parse_state
*state
)
6061 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6063 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6065 * "Any expression whose type evaluates to a Boolean can be used as the
6066 * conditional expression bool-expression. Vector types are not accepted
6067 * as the expression to if."
6069 * The checks are separated so that higher quality diagnostics can be
6070 * generated for cases where both rules are violated.
6072 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6073 YYLTYPE loc
= this->condition
->get_location();
6075 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6079 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6081 if (then_statement
!= NULL
) {
6082 state
->symbols
->push_scope();
6083 then_statement
->hir(& stmt
->then_instructions
, state
);
6084 state
->symbols
->pop_scope();
6087 if (else_statement
!= NULL
) {
6088 state
->symbols
->push_scope();
6089 else_statement
->hir(& stmt
->else_instructions
, state
);
6090 state
->symbols
->pop_scope();
6093 instructions
->push_tail(stmt
);
6095 /* if-statements do not have r-values.
6101 /* Used for detection of duplicate case values, compare
6102 * given contents directly.
6105 compare_case_value(const void *a
, const void *b
)
6107 return *(unsigned *) a
== *(unsigned *) b
;
6111 /* Used for detection of duplicate case values, just
6112 * returns key contents as is.
6115 key_contents(const void *key
)
6117 return *(unsigned *) key
;
6122 ast_switch_statement::hir(exec_list
*instructions
,
6123 struct _mesa_glsl_parse_state
*state
)
6127 ir_rvalue
*const test_expression
=
6128 this->test_expression
->hir(instructions
, state
);
6130 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6132 * "The type of init-expression in a switch statement must be a
6135 if (!test_expression
->type
->is_scalar() ||
6136 !test_expression
->type
->is_integer()) {
6137 YYLTYPE loc
= this->test_expression
->get_location();
6139 _mesa_glsl_error(& loc
,
6141 "switch-statement expression must be scalar "
6145 /* Track the switch-statement nesting in a stack-like manner.
6147 struct glsl_switch_state saved
= state
->switch_state
;
6149 state
->switch_state
.is_switch_innermost
= true;
6150 state
->switch_state
.switch_nesting_ast
= this;
6151 state
->switch_state
.labels_ht
=
6152 _mesa_hash_table_create(NULL
, key_contents
,
6153 compare_case_value
);
6154 state
->switch_state
.previous_default
= NULL
;
6156 /* Initalize is_fallthru state to false.
6158 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6159 state
->switch_state
.is_fallthru_var
=
6160 new(ctx
) ir_variable(glsl_type::bool_type
,
6161 "switch_is_fallthru_tmp",
6163 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6165 ir_dereference_variable
*deref_is_fallthru_var
=
6166 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6167 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6170 /* Initialize continue_inside state to false.
6172 state
->switch_state
.continue_inside
=
6173 new(ctx
) ir_variable(glsl_type::bool_type
,
6174 "continue_inside_tmp",
6176 instructions
->push_tail(state
->switch_state
.continue_inside
);
6178 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6179 ir_dereference_variable
*deref_continue_inside_var
=
6180 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6181 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6184 state
->switch_state
.run_default
=
6185 new(ctx
) ir_variable(glsl_type::bool_type
,
6188 instructions
->push_tail(state
->switch_state
.run_default
);
6190 /* Loop around the switch is used for flow control. */
6191 ir_loop
* loop
= new(ctx
) ir_loop();
6192 instructions
->push_tail(loop
);
6194 /* Cache test expression.
6196 test_to_hir(&loop
->body_instructions
, state
);
6198 /* Emit code for body of switch stmt.
6200 body
->hir(&loop
->body_instructions
, state
);
6202 /* Insert a break at the end to exit loop. */
6203 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6204 loop
->body_instructions
.push_tail(jump
);
6206 /* If we are inside loop, check if continue got called inside switch. */
6207 if (state
->loop_nesting_ast
!= NULL
) {
6208 ir_dereference_variable
*deref_continue_inside
=
6209 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6210 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6211 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6213 if (state
->loop_nesting_ast
!= NULL
) {
6214 if (state
->loop_nesting_ast
->rest_expression
) {
6215 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6218 if (state
->loop_nesting_ast
->mode
==
6219 ast_iteration_statement::ast_do_while
) {
6220 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6223 irif
->then_instructions
.push_tail(jump
);
6224 instructions
->push_tail(irif
);
6227 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6229 state
->switch_state
= saved
;
6231 /* Switch statements do not have r-values. */
6237 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6238 struct _mesa_glsl_parse_state
*state
)
6242 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6243 * on the switch test case. The first one would be already raised when
6244 * getting the test_expression at ast_switch_statement::hir
6246 test_expression
->set_is_lhs(true);
6247 /* Cache value of test expression. */
6248 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6250 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6253 ir_dereference_variable
*deref_test_var
=
6254 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6256 instructions
->push_tail(state
->switch_state
.test_var
);
6257 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6262 ast_switch_body::hir(exec_list
*instructions
,
6263 struct _mesa_glsl_parse_state
*state
)
6266 stmts
->hir(instructions
, state
);
6268 /* Switch bodies do not have r-values. */
6273 ast_case_statement_list::hir(exec_list
*instructions
,
6274 struct _mesa_glsl_parse_state
*state
)
6276 exec_list default_case
, after_default
, tmp
;
6278 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6279 case_stmt
->hir(&tmp
, state
);
6282 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6283 default_case
.append_list(&tmp
);
6287 /* If default case found, append 'after_default' list. */
6288 if (!default_case
.is_empty())
6289 after_default
.append_list(&tmp
);
6291 instructions
->append_list(&tmp
);
6294 /* Handle the default case. This is done here because default might not be
6295 * the last case. We need to add checks against following cases first to see
6296 * if default should be chosen or not.
6298 if (!default_case
.is_empty()) {
6300 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6301 ir_dereference_variable
*deref_run_default_var
=
6302 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6304 /* Choose to run default case initially, following conditional
6305 * assignments might change this.
6307 ir_assignment
*const init_var
=
6308 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6309 instructions
->push_tail(init_var
);
6311 /* Default case was the last one, no checks required. */
6312 if (after_default
.is_empty()) {
6313 instructions
->append_list(&default_case
);
6317 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6318 ir_assignment
*assign
= ir
->as_assignment();
6323 /* Clone the check between case label and init expression. */
6324 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6325 ir_expression
*clone
= exp
->clone(state
, NULL
);
6327 ir_dereference_variable
*deref_var
=
6328 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6329 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6331 ir_assignment
*const set_false
=
6332 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6334 instructions
->push_tail(set_false
);
6337 /* Append default case and all cases after it. */
6338 instructions
->append_list(&default_case
);
6339 instructions
->append_list(&after_default
);
6342 /* Case statements do not have r-values. */
6347 ast_case_statement::hir(exec_list
*instructions
,
6348 struct _mesa_glsl_parse_state
*state
)
6350 labels
->hir(instructions
, state
);
6352 /* Guard case statements depending on fallthru state. */
6353 ir_dereference_variable
*const deref_fallthru_guard
=
6354 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6355 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6357 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6358 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6360 instructions
->push_tail(test_fallthru
);
6362 /* Case statements do not have r-values. */
6368 ast_case_label_list::hir(exec_list
*instructions
,
6369 struct _mesa_glsl_parse_state
*state
)
6371 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6372 label
->hir(instructions
, state
);
6374 /* Case labels do not have r-values. */
6379 ast_case_label::hir(exec_list
*instructions
,
6380 struct _mesa_glsl_parse_state
*state
)
6384 ir_dereference_variable
*deref_fallthru_var
=
6385 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6387 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6389 /* If not default case, ... */
6390 if (this->test_value
!= NULL
) {
6391 /* Conditionally set fallthru state based on
6392 * comparison of cached test expression value to case label.
6394 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6395 ir_constant
*label_const
= label_rval
->constant_expression_value();
6398 YYLTYPE loc
= this->test_value
->get_location();
6400 _mesa_glsl_error(& loc
, state
,
6401 "switch statement case label must be a "
6402 "constant expression");
6404 /* Stuff a dummy value in to allow processing to continue. */
6405 label_const
= new(ctx
) ir_constant(0);
6408 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6409 (void *)(uintptr_t)&label_const
->value
.u
[0]);
6412 ast_expression
*previous_label
= (ast_expression
*) entry
->data
;
6413 YYLTYPE loc
= this->test_value
->get_location();
6414 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6416 loc
= previous_label
->get_location();
6417 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6419 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6420 (void *)(uintptr_t)&label_const
->value
.u
[0],
6425 ir_dereference_variable
*deref_test_var
=
6426 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6428 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6433 * From GLSL 4.40 specification section 6.2 ("Selection"):
6435 * "The type of the init-expression value in a switch statement must
6436 * be a scalar int or uint. The type of the constant-expression value
6437 * in a case label also must be a scalar int or uint. When any pair
6438 * of these values is tested for "equal value" and the types do not
6439 * match, an implicit conversion will be done to convert the int to a
6440 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6443 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6444 YYLTYPE loc
= this->test_value
->get_location();
6446 const glsl_type
*type_a
= label_const
->type
;
6447 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6449 /* Check if int->uint implicit conversion is supported. */
6450 bool integer_conversion_supported
=
6451 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6454 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6455 !integer_conversion_supported
) {
6456 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6457 "init-expression and case label (%s != %s)",
6458 type_a
->name
, type_b
->name
);
6460 /* Conversion of the case label. */
6461 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6462 if (!apply_implicit_conversion(glsl_type::uint_type
,
6463 test_cond
->operands
[0], state
))
6464 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6466 /* Conversion of the init-expression value. */
6467 if (!apply_implicit_conversion(glsl_type::uint_type
,
6468 test_cond
->operands
[1], state
))
6469 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6474 ir_assignment
*set_fallthru_on_test
=
6475 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6477 instructions
->push_tail(set_fallthru_on_test
);
6478 } else { /* default case */
6479 if (state
->switch_state
.previous_default
) {
6480 YYLTYPE loc
= this->get_location();
6481 _mesa_glsl_error(& loc
, state
,
6482 "multiple default labels in one switch");
6484 loc
= state
->switch_state
.previous_default
->get_location();
6485 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6487 state
->switch_state
.previous_default
= this;
6489 /* Set fallthru condition on 'run_default' bool. */
6490 ir_dereference_variable
*deref_run_default
=
6491 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6492 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6493 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6497 /* Set falltrhu state. */
6498 ir_assignment
*set_fallthru
=
6499 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6501 instructions
->push_tail(set_fallthru
);
6504 /* Case statements do not have r-values. */
6509 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6510 struct _mesa_glsl_parse_state
*state
)
6514 if (condition
!= NULL
) {
6515 ir_rvalue
*const cond
=
6516 condition
->hir(instructions
, state
);
6519 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6520 YYLTYPE loc
= condition
->get_location();
6522 _mesa_glsl_error(& loc
, state
,
6523 "loop condition must be scalar boolean");
6525 /* As the first code in the loop body, generate a block that looks
6526 * like 'if (!condition) break;' as the loop termination condition.
6528 ir_rvalue
*const not_cond
=
6529 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6531 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6533 ir_jump
*const break_stmt
=
6534 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6536 if_stmt
->then_instructions
.push_tail(break_stmt
);
6537 instructions
->push_tail(if_stmt
);
6544 ast_iteration_statement::hir(exec_list
*instructions
,
6545 struct _mesa_glsl_parse_state
*state
)
6549 /* For-loops and while-loops start a new scope, but do-while loops do not.
6551 if (mode
!= ast_do_while
)
6552 state
->symbols
->push_scope();
6554 if (init_statement
!= NULL
)
6555 init_statement
->hir(instructions
, state
);
6557 ir_loop
*const stmt
= new(ctx
) ir_loop();
6558 instructions
->push_tail(stmt
);
6560 /* Track the current loop nesting. */
6561 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6563 state
->loop_nesting_ast
= this;
6565 /* Likewise, indicate that following code is closest to a loop,
6566 * NOT closest to a switch.
6568 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6569 state
->switch_state
.is_switch_innermost
= false;
6571 if (mode
!= ast_do_while
)
6572 condition_to_hir(&stmt
->body_instructions
, state
);
6575 body
->hir(& stmt
->body_instructions
, state
);
6577 if (rest_expression
!= NULL
)
6578 rest_expression
->hir(& stmt
->body_instructions
, state
);
6580 if (mode
== ast_do_while
)
6581 condition_to_hir(&stmt
->body_instructions
, state
);
6583 if (mode
!= ast_do_while
)
6584 state
->symbols
->pop_scope();
6586 /* Restore previous nesting before returning. */
6587 state
->loop_nesting_ast
= nesting_ast
;
6588 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6590 /* Loops do not have r-values.
6597 * Determine if the given type is valid for establishing a default precision
6600 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6602 * "The precision statement
6604 * precision precision-qualifier type;
6606 * can be used to establish a default precision qualifier. The type field
6607 * can be either int or float or any of the sampler types, and the
6608 * precision-qualifier can be lowp, mediump, or highp."
6610 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6611 * qualifiers on sampler types, but this seems like an oversight (since the
6612 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6613 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6617 is_valid_default_precision_type(const struct glsl_type
*const type
)
6622 switch (type
->base_type
) {
6624 case GLSL_TYPE_FLOAT
:
6625 /* "int" and "float" are valid, but vectors and matrices are not. */
6626 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6627 case GLSL_TYPE_SAMPLER
:
6628 case GLSL_TYPE_IMAGE
:
6629 case GLSL_TYPE_ATOMIC_UINT
:
6638 ast_type_specifier::hir(exec_list
*instructions
,
6639 struct _mesa_glsl_parse_state
*state
)
6641 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6644 YYLTYPE loc
= this->get_location();
6646 /* If this is a precision statement, check that the type to which it is
6647 * applied is either float or int.
6649 * From section 4.5.3 of the GLSL 1.30 spec:
6650 * "The precision statement
6651 * precision precision-qualifier type;
6652 * can be used to establish a default precision qualifier. The type
6653 * field can be either int or float [...]. Any other types or
6654 * qualifiers will result in an error.
6656 if (this->default_precision
!= ast_precision_none
) {
6657 if (!state
->check_precision_qualifiers_allowed(&loc
))
6660 if (this->structure
!= NULL
) {
6661 _mesa_glsl_error(&loc
, state
,
6662 "precision qualifiers do not apply to structures");
6666 if (this->array_specifier
!= NULL
) {
6667 _mesa_glsl_error(&loc
, state
,
6668 "default precision statements do not apply to "
6673 const struct glsl_type
*const type
=
6674 state
->symbols
->get_type(this->type_name
);
6675 if (!is_valid_default_precision_type(type
)) {
6676 _mesa_glsl_error(&loc
, state
,
6677 "default precision statements apply only to "
6678 "float, int, and opaque types");
6682 if (state
->es_shader
) {
6683 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6686 * "Non-precision qualified declarations will use the precision
6687 * qualifier specified in the most recent precision statement
6688 * that is still in scope. The precision statement has the same
6689 * scoping rules as variable declarations. If it is declared
6690 * inside a compound statement, its effect stops at the end of
6691 * the innermost statement it was declared in. Precision
6692 * statements in nested scopes override precision statements in
6693 * outer scopes. Multiple precision statements for the same basic
6694 * type can appear inside the same scope, with later statements
6695 * overriding earlier statements within that scope."
6697 * Default precision specifications follow the same scope rules as
6698 * variables. So, we can track the state of the default precision
6699 * qualifiers in the symbol table, and the rules will just work. This
6700 * is a slight abuse of the symbol table, but it has the semantics
6703 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6704 this->default_precision
);
6707 /* FINISHME: Translate precision statements into IR. */
6711 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6712 * process_record_constructor() can do type-checking on C-style initializer
6713 * expressions of structs, but ast_struct_specifier should only be translated
6714 * to HIR if it is declaring the type of a structure.
6716 * The ->is_declaration field is false for initializers of variables
6717 * declared separately from the struct's type definition.
6719 * struct S { ... }; (is_declaration = true)
6720 * struct T { ... } t = { ... }; (is_declaration = true)
6721 * S s = { ... }; (is_declaration = false)
6723 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6724 return this->structure
->hir(instructions
, state
);
6731 * Process a structure or interface block tree into an array of structure fields
6733 * After parsing, where there are some syntax differnces, structures and
6734 * interface blocks are almost identical. They are similar enough that the
6735 * AST for each can be processed the same way into a set of
6736 * \c glsl_struct_field to describe the members.
6738 * If we're processing an interface block, var_mode should be the type of the
6739 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6740 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6744 * The number of fields processed. A pointer to the array structure fields is
6745 * stored in \c *fields_ret.
6748 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6749 struct _mesa_glsl_parse_state
*state
,
6750 exec_list
*declarations
,
6751 glsl_struct_field
**fields_ret
,
6753 enum glsl_matrix_layout matrix_layout
,
6754 bool allow_reserved_names
,
6755 ir_variable_mode var_mode
,
6756 ast_type_qualifier
*layout
,
6757 unsigned block_stream
,
6758 unsigned block_xfb_buffer
,
6759 unsigned block_xfb_offset
,
6760 unsigned expl_location
,
6761 unsigned expl_align
)
6763 unsigned decl_count
= 0;
6764 unsigned next_offset
= 0;
6766 /* Make an initial pass over the list of fields to determine how
6767 * many there are. Each element in this list is an ast_declarator_list.
6768 * This means that we actually need to count the number of elements in the
6769 * 'declarations' list in each of the elements.
6771 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6772 decl_count
+= decl_list
->declarations
.length();
6775 /* Allocate storage for the fields and process the field
6776 * declarations. As the declarations are processed, try to also convert
6777 * the types to HIR. This ensures that structure definitions embedded in
6778 * other structure definitions or in interface blocks are processed.
6780 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
6783 bool first_member
= true;
6784 bool first_member_has_explicit_location
= false;
6787 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6788 const char *type_name
;
6789 YYLTYPE loc
= decl_list
->get_location();
6791 decl_list
->type
->specifier
->hir(instructions
, state
);
6793 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6795 * "Anonymous structures are not supported; so embedded structures
6796 * must have a declarator. A name given to an embedded struct is
6797 * scoped at the same level as the struct it is embedded in."
6799 * The same section of the GLSL 1.20 spec says:
6801 * "Anonymous structures are not supported. Embedded structures are
6804 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6805 * embedded structures in 1.10 only.
6807 if (state
->language_version
!= 110 &&
6808 decl_list
->type
->specifier
->structure
!= NULL
)
6809 _mesa_glsl_error(&loc
, state
,
6810 "embedded structure declarations are not allowed");
6812 const glsl_type
*decl_type
=
6813 decl_list
->type
->glsl_type(& type_name
, state
);
6815 const struct ast_type_qualifier
*const qual
=
6816 &decl_list
->type
->qualifier
;
6818 /* From section 4.3.9 of the GLSL 4.40 spec:
6820 * "[In interface blocks] opaque types are not allowed."
6822 * It should be impossible for decl_type to be NULL here. Cases that
6823 * might naturally lead to decl_type being NULL, especially for the
6824 * is_interface case, will have resulted in compilation having
6825 * already halted due to a syntax error.
6830 if (decl_type
->contains_opaque()) {
6831 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6832 "interface block contains opaque variable");
6835 if (decl_type
->contains_atomic()) {
6836 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6838 * "Members of structures cannot be declared as atomic counter
6841 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6844 if (decl_type
->contains_image()) {
6845 /* FINISHME: Same problem as with atomic counters.
6846 * FINISHME: Request clarification from Khronos and add
6847 * FINISHME: spec quotation here.
6849 _mesa_glsl_error(&loc
, state
, "image in structure");
6853 if (qual
->flags
.q
.explicit_binding
) {
6854 _mesa_glsl_error(&loc
, state
,
6855 "binding layout qualifier cannot be applied "
6856 "to struct or interface block members");
6860 if (!first_member
) {
6861 if (!layout
->flags
.q
.explicit_location
&&
6862 ((first_member_has_explicit_location
&&
6863 !qual
->flags
.q
.explicit_location
) ||
6864 (!first_member_has_explicit_location
&&
6865 qual
->flags
.q
.explicit_location
))) {
6866 _mesa_glsl_error(&loc
, state
,
6867 "when block-level location layout qualifier "
6868 "is not supplied either all members must "
6869 "have a location layout qualifier or all "
6870 "members must not have a location layout "
6874 first_member
= false;
6875 first_member_has_explicit_location
=
6876 qual
->flags
.q
.explicit_location
;
6880 if (qual
->flags
.q
.std140
||
6881 qual
->flags
.q
.std430
||
6882 qual
->flags
.q
.packed
||
6883 qual
->flags
.q
.shared
) {
6884 _mesa_glsl_error(&loc
, state
,
6885 "uniform/shader storage block layout qualifiers "
6886 "std140, std430, packed, and shared can only be "
6887 "applied to uniform/shader storage blocks, not "
6891 if (qual
->flags
.q
.constant
) {
6892 _mesa_glsl_error(&loc
, state
,
6893 "const storage qualifier cannot be applied "
6894 "to struct or interface block members");
6897 validate_image_format_qualifier_for_type(state
, &loc
, qual
, decl_type
);
6899 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6901 * "A block member may be declared with a stream identifier, but
6902 * the specified stream must match the stream associated with the
6903 * containing block."
6905 if (qual
->flags
.q
.explicit_stream
) {
6906 unsigned qual_stream
;
6907 if (process_qualifier_constant(state
, &loc
, "stream",
6908 qual
->stream
, &qual_stream
) &&
6909 qual_stream
!= block_stream
) {
6910 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6911 "interface block member does not match "
6912 "the interface block (%u vs %u)", qual_stream
,
6918 unsigned explicit_xfb_buffer
= 0;
6919 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6920 unsigned qual_xfb_buffer
;
6921 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6922 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6923 explicit_xfb_buffer
= 1;
6924 if (qual_xfb_buffer
!= block_xfb_buffer
)
6925 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6926 "interface block member does not match "
6927 "the interface block (%u vs %u)",
6928 qual_xfb_buffer
, block_xfb_buffer
);
6930 xfb_buffer
= (int) qual_xfb_buffer
;
6933 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
6934 xfb_buffer
= (int) block_xfb_buffer
;
6937 int xfb_stride
= -1;
6938 if (qual
->flags
.q
.explicit_xfb_stride
) {
6939 unsigned qual_xfb_stride
;
6940 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6941 qual
->xfb_stride
, &qual_xfb_stride
)) {
6942 xfb_stride
= (int) qual_xfb_stride
;
6946 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6947 _mesa_glsl_error(&loc
, state
,
6948 "interpolation qualifiers cannot be used "
6949 "with uniform interface blocks");
6952 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6953 qual
->has_auxiliary_storage()) {
6954 _mesa_glsl_error(&loc
, state
,
6955 "auxiliary storage qualifiers cannot be used "
6956 "in uniform blocks or structures.");
6959 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6960 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6961 _mesa_glsl_error(&loc
, state
,
6962 "row_major and column_major can only be "
6963 "applied to interface blocks");
6965 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6968 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6969 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6970 "readonly and writeonly.");
6973 foreach_list_typed (ast_declaration
, decl
, link
,
6974 &decl_list
->declarations
) {
6975 YYLTYPE loc
= decl
->get_location();
6977 if (!allow_reserved_names
)
6978 validate_identifier(decl
->identifier
, loc
, state
);
6980 const struct glsl_type
*field_type
=
6981 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6982 validate_array_dimensions(field_type
, state
, &loc
);
6983 fields
[i
].type
= field_type
;
6984 fields
[i
].name
= decl
->identifier
;
6985 fields
[i
].interpolation
=
6986 interpret_interpolation_qualifier(qual
, field_type
,
6987 var_mode
, state
, &loc
);
6988 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6989 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6990 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6991 fields
[i
].precision
= qual
->precision
;
6992 fields
[i
].offset
= -1;
6993 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6994 fields
[i
].xfb_buffer
= xfb_buffer
;
6995 fields
[i
].xfb_stride
= xfb_stride
;
6997 if (qual
->flags
.q
.explicit_location
) {
6998 unsigned qual_location
;
6999 if (process_qualifier_constant(state
, &loc
, "location",
7000 qual
->location
, &qual_location
)) {
7001 fields
[i
].location
= qual_location
+
7002 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
7003 expl_location
= fields
[i
].location
+
7004 fields
[i
].type
->count_attribute_slots(false);
7007 if (layout
&& layout
->flags
.q
.explicit_location
) {
7008 fields
[i
].location
= expl_location
;
7009 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
7011 fields
[i
].location
= -1;
7015 /* Offset can only be used with std430 and std140 layouts an initial
7016 * value of 0 is used for error detection.
7022 if (qual
->flags
.q
.row_major
||
7023 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
7029 if(layout
->flags
.q
.std140
) {
7030 align
= field_type
->std140_base_alignment(row_major
);
7031 size
= field_type
->std140_size(row_major
);
7032 } else if (layout
->flags
.q
.std430
) {
7033 align
= field_type
->std430_base_alignment(row_major
);
7034 size
= field_type
->std430_size(row_major
);
7038 if (qual
->flags
.q
.explicit_offset
) {
7039 unsigned qual_offset
;
7040 if (process_qualifier_constant(state
, &loc
, "offset",
7041 qual
->offset
, &qual_offset
)) {
7042 if (align
!= 0 && size
!= 0) {
7043 if (next_offset
> qual_offset
)
7044 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7045 "offset overlaps previous member");
7047 if (qual_offset
% align
) {
7048 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7049 "must be a multiple of the base "
7050 "alignment of %s", field_type
->name
);
7052 fields
[i
].offset
= qual_offset
;
7053 next_offset
= glsl_align(qual_offset
+ size
, align
);
7055 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7056 "with std430 and std140 layouts");
7061 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7062 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7064 if (align
== 0 || size
== 0) {
7065 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7066 "std430 and std140 layouts");
7067 } else if (qual
->flags
.q
.explicit_align
) {
7068 unsigned member_align
;
7069 if (process_qualifier_constant(state
, &loc
, "align",
7070 qual
->align
, &member_align
)) {
7071 if (member_align
== 0 ||
7072 member_align
& (member_align
- 1)) {
7073 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7074 "in not a power of 2");
7076 fields
[i
].offset
= glsl_align(offset
, member_align
);
7077 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7081 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7082 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7084 } else if (!qual
->flags
.q
.explicit_offset
) {
7085 if (align
!= 0 && size
!= 0)
7086 next_offset
= glsl_align(next_offset
+ size
, align
);
7089 /* From the ARB_enhanced_layouts spec:
7091 * "The given offset applies to the first component of the first
7092 * member of the qualified entity. Then, within the qualified
7093 * entity, subsequent components are each assigned, in order, to
7094 * the next available offset aligned to a multiple of that
7095 * component's size. Aggregate types are flattened down to the
7096 * component level to get this sequence of components."
7098 if (qual
->flags
.q
.explicit_xfb_offset
) {
7099 unsigned xfb_offset
;
7100 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7101 qual
->offset
, &xfb_offset
)) {
7102 fields
[i
].offset
= xfb_offset
;
7103 block_xfb_offset
= fields
[i
].offset
+
7104 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
7107 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7108 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7109 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7111 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
7115 /* Propogate row- / column-major information down the fields of the
7116 * structure or interface block. Structures need this data because
7117 * the structure may contain a structure that contains ... a matrix
7118 * that need the proper layout.
7120 if (is_interface
&& layout
&&
7121 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7122 (field_type
->without_array()->is_matrix()
7123 || field_type
->without_array()->is_record())) {
7124 /* If no layout is specified for the field, inherit the layout
7127 fields
[i
].matrix_layout
= matrix_layout
;
7129 if (qual
->flags
.q
.row_major
)
7130 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7131 else if (qual
->flags
.q
.column_major
)
7132 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7134 /* If we're processing an uniform or buffer block, the matrix
7135 * layout must be decided by this point.
7137 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7138 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7141 /* Image qualifiers are allowed on buffer variables, which can only
7142 * be defined inside shader storage buffer objects
7144 if (layout
&& var_mode
== ir_var_shader_storage
) {
7145 /* For readonly and writeonly qualifiers the field definition,
7146 * if set, overwrites the layout qualifier.
7148 if (qual
->flags
.q
.read_only
) {
7149 fields
[i
].memory_read_only
= true;
7150 fields
[i
].memory_write_only
= false;
7151 } else if (qual
->flags
.q
.write_only
) {
7152 fields
[i
].memory_read_only
= false;
7153 fields
[i
].memory_write_only
= true;
7155 fields
[i
].memory_read_only
= layout
->flags
.q
.read_only
;
7156 fields
[i
].memory_write_only
= layout
->flags
.q
.write_only
;
7159 /* For other qualifiers, we set the flag if either the layout
7160 * qualifier or the field qualifier are set
7162 fields
[i
].memory_coherent
= qual
->flags
.q
.coherent
||
7163 layout
->flags
.q
.coherent
;
7164 fields
[i
].memory_volatile
= qual
->flags
.q
._volatile
||
7165 layout
->flags
.q
._volatile
;
7166 fields
[i
].memory_restrict
= qual
->flags
.q
.restrict_flag
||
7167 layout
->flags
.q
.restrict_flag
;
7174 assert(i
== decl_count
);
7176 *fields_ret
= fields
;
7182 ast_struct_specifier::hir(exec_list
*instructions
,
7183 struct _mesa_glsl_parse_state
*state
)
7185 YYLTYPE loc
= this->get_location();
7187 unsigned expl_location
= 0;
7188 if (layout
&& layout
->flags
.q
.explicit_location
) {
7189 if (!process_qualifier_constant(state
, &loc
, "location",
7190 layout
->location
, &expl_location
)) {
7193 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7197 glsl_struct_field
*fields
;
7198 unsigned decl_count
=
7199 ast_process_struct_or_iface_block_members(instructions
,
7201 &this->declarations
,
7204 GLSL_MATRIX_LAYOUT_INHERITED
,
7205 false /* allow_reserved_names */,
7208 0, /* for interface only */
7209 0, /* for interface only */
7210 0, /* for interface only */
7212 0 /* for interface only */);
7214 validate_identifier(this->name
, loc
, state
);
7216 const glsl_type
*t
=
7217 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7219 if (!state
->symbols
->add_type(name
, t
)) {
7220 const glsl_type
*match
= state
->symbols
->get_type(name
);
7221 /* allow struct matching for desktop GL - older UE4 does this */
7222 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
7223 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7225 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7227 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7229 state
->num_user_structures
+ 1);
7231 s
[state
->num_user_structures
] = t
;
7232 state
->user_structures
= s
;
7233 state
->num_user_structures
++;
7237 /* Structure type definitions do not have r-values.
7244 * Visitor class which detects whether a given interface block has been used.
7246 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7249 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7250 : mode(mode
), block(block
), found(false)
7254 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7256 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7260 return visit_continue
;
7263 bool usage_found() const
7269 ir_variable_mode mode
;
7270 const glsl_type
*block
;
7275 is_unsized_array_last_element(ir_variable
*v
)
7277 const glsl_type
*interface_type
= v
->get_interface_type();
7278 int length
= interface_type
->length
;
7280 assert(v
->type
->is_unsized_array());
7282 /* Check if it is the last element of the interface */
7283 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7289 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7291 var
->data
.memory_read_only
= field
.memory_read_only
;
7292 var
->data
.memory_write_only
= field
.memory_write_only
;
7293 var
->data
.memory_coherent
= field
.memory_coherent
;
7294 var
->data
.memory_volatile
= field
.memory_volatile
;
7295 var
->data
.memory_restrict
= field
.memory_restrict
;
7299 ast_interface_block::hir(exec_list
*instructions
,
7300 struct _mesa_glsl_parse_state
*state
)
7302 YYLTYPE loc
= this->get_location();
7304 /* Interface blocks must be declared at global scope */
7305 if (state
->current_function
!= NULL
) {
7306 _mesa_glsl_error(&loc
, state
,
7307 "Interface block `%s' must be declared "
7312 /* Validate qualifiers:
7314 * - Layout Qualifiers as per the table in Section 4.4
7315 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7317 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7320 * "Additionally, memory qualifiers may also be used in the declaration
7321 * of shader storage blocks"
7323 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7324 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7325 * Layout Qualifiers) of the GLSL 4.50 spec says:
7327 * "The std430 qualifier is supported only for shader storage blocks;
7328 * using std430 on a uniform block will result in a compile-time error."
7330 ast_type_qualifier allowed_blk_qualifiers
;
7331 allowed_blk_qualifiers
.flags
.i
= 0;
7332 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7333 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7334 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7335 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7336 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7337 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7338 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7339 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7340 if (this->layout
.flags
.q
.buffer
) {
7341 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7342 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7343 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7344 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7345 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7346 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7347 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7349 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7352 /* Interface block */
7353 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7355 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7356 if (this->layout
.flags
.q
.out
) {
7357 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7358 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7359 state
->stage
== MESA_SHADER_TESS_CTRL
||
7360 state
->stage
== MESA_SHADER_TESS_EVAL
||
7361 state
->stage
== MESA_SHADER_VERTEX
) {
7362 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7363 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7364 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7365 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7366 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7367 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7368 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7369 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7371 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7372 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7376 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7377 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7378 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7383 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7384 "invalid qualifier for block",
7387 /* The ast_interface_block has a list of ast_declarator_lists. We
7388 * need to turn those into ir_variables with an association
7389 * with this uniform block.
7391 enum glsl_interface_packing packing
;
7392 if (this->layout
.flags
.q
.shared
) {
7393 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7394 } else if (this->layout
.flags
.q
.packed
) {
7395 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7396 } else if (this->layout
.flags
.q
.std430
) {
7397 packing
= GLSL_INTERFACE_PACKING_STD430
;
7399 /* The default layout is std140.
7401 packing
= GLSL_INTERFACE_PACKING_STD140
;
7404 ir_variable_mode var_mode
;
7405 const char *iface_type_name
;
7406 if (this->layout
.flags
.q
.in
) {
7407 var_mode
= ir_var_shader_in
;
7408 iface_type_name
= "in";
7409 } else if (this->layout
.flags
.q
.out
) {
7410 var_mode
= ir_var_shader_out
;
7411 iface_type_name
= "out";
7412 } else if (this->layout
.flags
.q
.uniform
) {
7413 var_mode
= ir_var_uniform
;
7414 iface_type_name
= "uniform";
7415 } else if (this->layout
.flags
.q
.buffer
) {
7416 var_mode
= ir_var_shader_storage
;
7417 iface_type_name
= "buffer";
7419 var_mode
= ir_var_auto
;
7420 iface_type_name
= "UNKNOWN";
7421 assert(!"interface block layout qualifier not found!");
7424 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7425 if (this->layout
.flags
.q
.row_major
)
7426 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7427 else if (this->layout
.flags
.q
.column_major
)
7428 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7430 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7431 exec_list declared_variables
;
7432 glsl_struct_field
*fields
;
7434 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7435 * that we don't have incompatible qualifiers
7437 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7438 _mesa_glsl_error(&loc
, state
,
7439 "Interface block sets both readonly and writeonly");
7442 unsigned qual_stream
;
7443 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7445 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7446 /* If the stream qualifier is invalid it doesn't make sense to continue
7447 * on and try to compare stream layouts on member variables against it
7448 * so just return early.
7453 unsigned qual_xfb_buffer
;
7454 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7455 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7456 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7460 unsigned qual_xfb_offset
;
7461 if (layout
.flags
.q
.explicit_xfb_offset
) {
7462 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7463 layout
.offset
, &qual_xfb_offset
)) {
7468 unsigned qual_xfb_stride
;
7469 if (layout
.flags
.q
.explicit_xfb_stride
) {
7470 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7471 layout
.xfb_stride
, &qual_xfb_stride
)) {
7476 unsigned expl_location
= 0;
7477 if (layout
.flags
.q
.explicit_location
) {
7478 if (!process_qualifier_constant(state
, &loc
, "location",
7479 layout
.location
, &expl_location
)) {
7482 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7483 : VARYING_SLOT_VAR0
;
7487 unsigned expl_align
= 0;
7488 if (layout
.flags
.q
.explicit_align
) {
7489 if (!process_qualifier_constant(state
, &loc
, "align",
7490 layout
.align
, &expl_align
)) {
7493 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7494 _mesa_glsl_error(&loc
, state
, "align layout qualifier is not a "
7501 unsigned int num_variables
=
7502 ast_process_struct_or_iface_block_members(&declared_variables
,
7504 &this->declarations
,
7508 redeclaring_per_vertex
,
7517 if (!redeclaring_per_vertex
) {
7518 validate_identifier(this->block_name
, loc
, state
);
7520 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7522 * "Block names have no other use within a shader beyond interface
7523 * matching; it is a compile-time error to use a block name at global
7524 * scope for anything other than as a block name."
7526 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7527 if (var
&& !var
->type
->is_interface()) {
7528 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7529 "already used in the scope.",
7534 const glsl_type
*earlier_per_vertex
= NULL
;
7535 if (redeclaring_per_vertex
) {
7536 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7537 * the named interface block gl_in, we can find it by looking at the
7538 * previous declaration of gl_in. Otherwise we can find it by looking
7539 * at the previous decalartion of any of the built-in outputs,
7542 * Also check that the instance name and array-ness of the redeclaration
7546 case ir_var_shader_in
:
7547 if (ir_variable
*earlier_gl_in
=
7548 state
->symbols
->get_variable("gl_in")) {
7549 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7551 _mesa_glsl_error(&loc
, state
,
7552 "redeclaration of gl_PerVertex input not allowed "
7554 _mesa_shader_stage_to_string(state
->stage
));
7556 if (this->instance_name
== NULL
||
7557 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7558 !this->array_specifier
->is_single_dimension()) {
7559 _mesa_glsl_error(&loc
, state
,
7560 "gl_PerVertex input must be redeclared as "
7564 case ir_var_shader_out
:
7565 if (ir_variable
*earlier_gl_Position
=
7566 state
->symbols
->get_variable("gl_Position")) {
7567 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7568 } else if (ir_variable
*earlier_gl_out
=
7569 state
->symbols
->get_variable("gl_out")) {
7570 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7572 _mesa_glsl_error(&loc
, state
,
7573 "redeclaration of gl_PerVertex output not "
7574 "allowed in the %s shader",
7575 _mesa_shader_stage_to_string(state
->stage
));
7577 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7578 if (this->instance_name
== NULL
||
7579 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7580 _mesa_glsl_error(&loc
, state
,
7581 "gl_PerVertex output must be redeclared as "
7585 if (this->instance_name
!= NULL
) {
7586 _mesa_glsl_error(&loc
, state
,
7587 "gl_PerVertex output may not be redeclared with "
7588 "an instance name");
7593 _mesa_glsl_error(&loc
, state
,
7594 "gl_PerVertex must be declared as an input or an "
7599 if (earlier_per_vertex
== NULL
) {
7600 /* An error has already been reported. Bail out to avoid null
7601 * dereferences later in this function.
7606 /* Copy locations from the old gl_PerVertex interface block. */
7607 for (unsigned i
= 0; i
< num_variables
; i
++) {
7608 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7610 _mesa_glsl_error(&loc
, state
,
7611 "redeclaration of gl_PerVertex must be a subset "
7612 "of the built-in members of gl_PerVertex");
7614 fields
[i
].location
=
7615 earlier_per_vertex
->fields
.structure
[j
].location
;
7617 earlier_per_vertex
->fields
.structure
[j
].offset
;
7618 fields
[i
].interpolation
=
7619 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7620 fields
[i
].centroid
=
7621 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7623 earlier_per_vertex
->fields
.structure
[j
].sample
;
7625 earlier_per_vertex
->fields
.structure
[j
].patch
;
7626 fields
[i
].precision
=
7627 earlier_per_vertex
->fields
.structure
[j
].precision
;
7628 fields
[i
].explicit_xfb_buffer
=
7629 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7630 fields
[i
].xfb_buffer
=
7631 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7632 fields
[i
].xfb_stride
=
7633 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7637 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7640 * If a built-in interface block is redeclared, it must appear in
7641 * the shader before any use of any member included in the built-in
7642 * declaration, or a compilation error will result.
7644 * This appears to be a clarification to the behaviour established for
7645 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7646 * regardless of GLSL version.
7648 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7649 v
.run(instructions
);
7650 if (v
.usage_found()) {
7651 _mesa_glsl_error(&loc
, state
,
7652 "redeclaration of a built-in interface block must "
7653 "appear before any use of any member of the "
7658 const glsl_type
*block_type
=
7659 glsl_type::get_interface_instance(fields
,
7663 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
7666 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7668 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7669 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7672 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7673 YYLTYPE loc
= this->get_location();
7674 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7675 "already taken in the current scope",
7676 this->block_name
, iface_type_name
);
7679 /* Since interface blocks cannot contain statements, it should be
7680 * impossible for the block to generate any instructions.
7682 assert(declared_variables
.is_empty());
7684 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7686 * Geometry shader input variables get the per-vertex values written
7687 * out by vertex shader output variables of the same names. Since a
7688 * geometry shader operates on a set of vertices, each input varying
7689 * variable (or input block, see interface blocks below) needs to be
7690 * declared as an array.
7692 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7693 var_mode
== ir_var_shader_in
) {
7694 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7695 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7696 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7697 !this->layout
.flags
.q
.patch
&&
7698 this->array_specifier
== NULL
&&
7699 var_mode
== ir_var_shader_in
) {
7700 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7701 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7702 !this->layout
.flags
.q
.patch
&&
7703 this->array_specifier
== NULL
&&
7704 var_mode
== ir_var_shader_out
) {
7705 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7709 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7712 * "If an instance name (instance-name) is used, then it puts all the
7713 * members inside a scope within its own name space, accessed with the
7714 * field selector ( . ) operator (analogously to structures)."
7716 if (this->instance_name
) {
7717 if (redeclaring_per_vertex
) {
7718 /* When a built-in in an unnamed interface block is redeclared,
7719 * get_variable_being_redeclared() calls
7720 * check_builtin_array_max_size() to make sure that built-in array
7721 * variables aren't redeclared to illegal sizes. But we're looking
7722 * at a redeclaration of a named built-in interface block. So we
7723 * have to manually call check_builtin_array_max_size() for all parts
7724 * of the interface that are arrays.
7726 for (unsigned i
= 0; i
< num_variables
; i
++) {
7727 if (fields
[i
].type
->is_array()) {
7728 const unsigned size
= fields
[i
].type
->array_size();
7729 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7733 validate_identifier(this->instance_name
, loc
, state
);
7738 if (this->array_specifier
!= NULL
) {
7739 const glsl_type
*block_array_type
=
7740 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7742 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7744 * For uniform blocks declared an array, each individual array
7745 * element corresponds to a separate buffer object backing one
7746 * instance of the block. As the array size indicates the number
7747 * of buffer objects needed, uniform block array declarations
7748 * must specify an array size.
7750 * And a few paragraphs later:
7752 * Geometry shader input blocks must be declared as arrays and
7753 * follow the array declaration and linking rules for all
7754 * geometry shader inputs. All other input and output block
7755 * arrays must specify an array size.
7757 * The same applies to tessellation shaders.
7759 * The upshot of this is that the only circumstance where an
7760 * interface array size *doesn't* need to be specified is on a
7761 * geometry shader input, tessellation control shader input,
7762 * tessellation control shader output, and tessellation evaluation
7765 if (block_array_type
->is_unsized_array()) {
7766 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7767 state
->stage
== MESA_SHADER_TESS_CTRL
||
7768 state
->stage
== MESA_SHADER_TESS_EVAL
;
7769 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7771 if (this->layout
.flags
.q
.in
) {
7773 _mesa_glsl_error(&loc
, state
,
7774 "unsized input block arrays not allowed in "
7776 _mesa_shader_stage_to_string(state
->stage
));
7777 } else if (this->layout
.flags
.q
.out
) {
7779 _mesa_glsl_error(&loc
, state
,
7780 "unsized output block arrays not allowed in "
7782 _mesa_shader_stage_to_string(state
->stage
));
7784 /* by elimination, this is a uniform block array */
7785 _mesa_glsl_error(&loc
, state
,
7786 "unsized uniform block arrays not allowed in "
7788 _mesa_shader_stage_to_string(state
->stage
));
7792 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7794 * * Arrays of arrays of blocks are not allowed
7796 if (state
->es_shader
&& block_array_type
->is_array() &&
7797 block_array_type
->fields
.array
->is_array()) {
7798 _mesa_glsl_error(&loc
, state
,
7799 "arrays of arrays interface blocks are "
7803 var
= new(state
) ir_variable(block_array_type
,
7804 this->instance_name
,
7807 var
= new(state
) ir_variable(block_type
,
7808 this->instance_name
,
7812 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7813 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7815 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7816 var
->data
.read_only
= true;
7818 var
->data
.patch
= this->layout
.flags
.q
.patch
;
7820 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7821 handle_geometry_shader_input_decl(state
, loc
, var
);
7822 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7823 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7824 handle_tess_shader_input_decl(state
, loc
, var
);
7825 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7826 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7828 for (unsigned i
= 0; i
< num_variables
; i
++) {
7829 if (var
->data
.mode
== ir_var_shader_storage
)
7830 apply_memory_qualifiers(var
, fields
[i
]);
7833 if (ir_variable
*earlier
=
7834 state
->symbols
->get_variable(this->instance_name
)) {
7835 if (!redeclaring_per_vertex
) {
7836 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7837 this->instance_name
);
7839 earlier
->data
.how_declared
= ir_var_declared_normally
;
7840 earlier
->type
= var
->type
;
7841 earlier
->reinit_interface_type(block_type
);
7844 if (this->layout
.flags
.q
.explicit_binding
) {
7845 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7849 var
->data
.stream
= qual_stream
;
7850 if (layout
.flags
.q
.explicit_location
) {
7851 var
->data
.location
= expl_location
;
7852 var
->data
.explicit_location
= true;
7855 state
->symbols
->add_variable(var
);
7856 instructions
->push_tail(var
);
7859 /* In order to have an array size, the block must also be declared with
7862 assert(this->array_specifier
== NULL
);
7864 for (unsigned i
= 0; i
< num_variables
; i
++) {
7866 new(state
) ir_variable(fields
[i
].type
,
7867 ralloc_strdup(state
, fields
[i
].name
),
7869 var
->data
.interpolation
= fields
[i
].interpolation
;
7870 var
->data
.centroid
= fields
[i
].centroid
;
7871 var
->data
.sample
= fields
[i
].sample
;
7872 var
->data
.patch
= fields
[i
].patch
;
7873 var
->data
.stream
= qual_stream
;
7874 var
->data
.location
= fields
[i
].location
;
7876 if (fields
[i
].location
!= -1)
7877 var
->data
.explicit_location
= true;
7879 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7880 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7882 if (fields
[i
].offset
!= -1)
7883 var
->data
.explicit_xfb_offset
= true;
7884 var
->data
.offset
= fields
[i
].offset
;
7886 var
->init_interface_type(block_type
);
7888 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7889 var
->data
.read_only
= true;
7891 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7892 if (state
->es_shader
) {
7893 var
->data
.precision
=
7894 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7898 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7899 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7900 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7902 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7905 if (var
->data
.mode
== ir_var_shader_storage
)
7906 apply_memory_qualifiers(var
, fields
[i
]);
7908 /* Examine var name here since var may get deleted in the next call */
7909 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7911 if (redeclaring_per_vertex
) {
7912 bool is_redeclaration
;
7913 ir_variable
*declared_var
=
7914 get_variable_being_redeclared(var
, loc
, state
,
7915 true /* allow_all_redeclarations */,
7917 if (!var_is_gl_id
|| !is_redeclaration
) {
7918 _mesa_glsl_error(&loc
, state
,
7919 "redeclaration of gl_PerVertex can only "
7920 "include built-in variables");
7921 } else if (declared_var
->data
.how_declared
== ir_var_declared_normally
) {
7922 _mesa_glsl_error(&loc
, state
,
7923 "`%s' has already been redeclared",
7924 declared_var
->name
);
7926 declared_var
->data
.how_declared
= ir_var_declared_in_block
;
7927 declared_var
->reinit_interface_type(block_type
);
7932 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7933 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7935 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7936 * The UBO declaration itself doesn't get an ir_variable unless it
7937 * has an instance name. This is ugly.
7939 if (this->layout
.flags
.q
.explicit_binding
) {
7940 apply_explicit_binding(state
, &loc
, var
,
7941 var
->get_interface_type(), &this->layout
);
7944 if (var
->type
->is_unsized_array()) {
7945 if (var
->is_in_shader_storage_block() &&
7946 is_unsized_array_last_element(var
)) {
7947 var
->data
.from_ssbo_unsized_array
= true;
7949 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7951 * "If an array is declared as the last member of a shader storage
7952 * block and the size is not specified at compile-time, it is
7953 * sized at run-time. In all other cases, arrays are sized only
7956 * In desktop GLSL it is allowed to have unsized-arrays that are
7957 * not last, as long as we can determine that they are implicitly
7960 if (state
->es_shader
) {
7961 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
7962 "definition: only last member of a shader "
7963 "storage block can be defined as unsized "
7964 "array", fields
[i
].name
);
7969 state
->symbols
->add_variable(var
);
7970 instructions
->push_tail(var
);
7973 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7974 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7976 * It is also a compilation error ... to redeclare a built-in
7977 * block and then use a member from that built-in block that was
7978 * not included in the redeclaration.
7980 * This appears to be a clarification to the behaviour established
7981 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7982 * behaviour regardless of GLSL version.
7984 * To prevent the shader from using a member that was not included in
7985 * the redeclaration, we disable any ir_variables that are still
7986 * associated with the old declaration of gl_PerVertex (since we've
7987 * already updated all of the variables contained in the new
7988 * gl_PerVertex to point to it).
7990 * As a side effect this will prevent
7991 * validate_intrastage_interface_blocks() from getting confused and
7992 * thinking there are conflicting definitions of gl_PerVertex in the
7995 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7996 ir_variable
*const var
= node
->as_variable();
7998 var
->get_interface_type() == earlier_per_vertex
&&
7999 var
->data
.mode
== var_mode
) {
8000 if (var
->data
.how_declared
== ir_var_declared_normally
) {
8001 _mesa_glsl_error(&loc
, state
,
8002 "redeclaration of gl_PerVertex cannot "
8003 "follow a redeclaration of `%s'",
8006 state
->symbols
->disable_variable(var
->name
);
8018 ast_tcs_output_layout::hir(exec_list
*instructions
,
8019 struct _mesa_glsl_parse_state
*state
)
8021 YYLTYPE loc
= this->get_location();
8023 unsigned num_vertices
;
8024 if (!state
->out_qualifier
->vertices
->
8025 process_qualifier_constant(state
, "vertices", &num_vertices
,
8027 /* return here to stop cascading incorrect error messages */
8031 /* If any shader outputs occurred before this declaration and specified an
8032 * array size, make sure the size they specified is consistent with the
8035 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8036 _mesa_glsl_error(&loc
, state
,
8037 "this tessellation control shader output layout "
8038 "specifies %u vertices, but a previous output "
8039 "is declared with size %u",
8040 num_vertices
, state
->tcs_output_size
);
8044 state
->tcs_output_vertices_specified
= true;
8046 /* If any shader outputs occurred before this declaration and did not
8047 * specify an array size, their size is determined now.
8049 foreach_in_list (ir_instruction
, node
, instructions
) {
8050 ir_variable
*var
= node
->as_variable();
8051 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8054 /* Note: Not all tessellation control shader output are arrays. */
8055 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8058 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8059 _mesa_glsl_error(&loc
, state
,
8060 "this tessellation control shader output layout "
8061 "specifies %u vertices, but an access to element "
8062 "%u of output `%s' already exists", num_vertices
,
8063 var
->data
.max_array_access
, var
->name
);
8065 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8075 ast_gs_input_layout::hir(exec_list
*instructions
,
8076 struct _mesa_glsl_parse_state
*state
)
8078 YYLTYPE loc
= this->get_location();
8080 /* Should have been prevented by the parser. */
8081 assert(!state
->gs_input_prim_type_specified
8082 || state
->in_qualifier
->prim_type
== this->prim_type
);
8084 /* If any shader inputs occurred before this declaration and specified an
8085 * array size, make sure the size they specified is consistent with the
8088 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8089 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8090 _mesa_glsl_error(&loc
, state
,
8091 "this geometry shader input layout implies %u vertices"
8092 " per primitive, but a previous input is declared"
8093 " with size %u", num_vertices
, state
->gs_input_size
);
8097 state
->gs_input_prim_type_specified
= true;
8099 /* If any shader inputs occurred before this declaration and did not
8100 * specify an array size, their size is determined now.
8102 foreach_in_list(ir_instruction
, node
, instructions
) {
8103 ir_variable
*var
= node
->as_variable();
8104 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8107 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8111 if (var
->type
->is_unsized_array()) {
8112 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8113 _mesa_glsl_error(&loc
, state
,
8114 "this geometry shader input layout implies %u"
8115 " vertices, but an access to element %u of input"
8116 " `%s' already exists", num_vertices
,
8117 var
->data
.max_array_access
, var
->name
);
8119 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8130 ast_cs_input_layout::hir(exec_list
*instructions
,
8131 struct _mesa_glsl_parse_state
*state
)
8133 YYLTYPE loc
= this->get_location();
8135 /* From the ARB_compute_shader specification:
8137 * If the local size of the shader in any dimension is greater
8138 * than the maximum size supported by the implementation for that
8139 * dimension, a compile-time error results.
8141 * It is not clear from the spec how the error should be reported if
8142 * the total size of the work group exceeds
8143 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8144 * report it at compile time as well.
8146 GLuint64 total_invocations
= 1;
8147 unsigned qual_local_size
[3];
8148 for (int i
= 0; i
< 3; i
++) {
8150 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8152 /* Infer a local_size of 1 for unspecified dimensions */
8153 if (this->local_size
[i
] == NULL
) {
8154 qual_local_size
[i
] = 1;
8155 } else if (!this->local_size
[i
]->
8156 process_qualifier_constant(state
, local_size_str
,
8157 &qual_local_size
[i
], false)) {
8158 ralloc_free(local_size_str
);
8161 ralloc_free(local_size_str
);
8163 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8164 _mesa_glsl_error(&loc
, state
,
8165 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8167 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8170 total_invocations
*= qual_local_size
[i
];
8171 if (total_invocations
>
8172 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8173 _mesa_glsl_error(&loc
, state
,
8174 "product of local_sizes exceeds "
8175 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8176 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8181 /* If any compute input layout declaration preceded this one, make sure it
8182 * was consistent with this one.
8184 if (state
->cs_input_local_size_specified
) {
8185 for (int i
= 0; i
< 3; i
++) {
8186 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8187 _mesa_glsl_error(&loc
, state
,
8188 "compute shader input layout does not match"
8189 " previous declaration");
8195 /* The ARB_compute_variable_group_size spec says:
8197 * If a compute shader including a *local_size_variable* qualifier also
8198 * declares a fixed local group size using the *local_size_x*,
8199 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8202 if (state
->cs_input_local_size_variable_specified
) {
8203 _mesa_glsl_error(&loc
, state
,
8204 "compute shader can't include both a variable and a "
8205 "fixed local group size");
8209 state
->cs_input_local_size_specified
= true;
8210 for (int i
= 0; i
< 3; i
++)
8211 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8213 /* We may now declare the built-in constant gl_WorkGroupSize (see
8214 * builtin_variable_generator::generate_constants() for why we didn't
8215 * declare it earlier).
8217 ir_variable
*var
= new(state
->symbols
)
8218 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8219 var
->data
.how_declared
= ir_var_declared_implicitly
;
8220 var
->data
.read_only
= true;
8221 instructions
->push_tail(var
);
8222 state
->symbols
->add_variable(var
);
8223 ir_constant_data data
;
8224 memset(&data
, 0, sizeof(data
));
8225 for (int i
= 0; i
< 3; i
++)
8226 data
.u
[i
] = qual_local_size
[i
];
8227 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8228 var
->constant_initializer
=
8229 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8230 var
->data
.has_initializer
= true;
8237 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8238 exec_list
*instructions
)
8240 bool gl_FragColor_assigned
= false;
8241 bool gl_FragData_assigned
= false;
8242 bool gl_FragSecondaryColor_assigned
= false;
8243 bool gl_FragSecondaryData_assigned
= false;
8244 bool user_defined_fs_output_assigned
= false;
8245 ir_variable
*user_defined_fs_output
= NULL
;
8247 /* It would be nice to have proper location information. */
8249 memset(&loc
, 0, sizeof(loc
));
8251 foreach_in_list(ir_instruction
, node
, instructions
) {
8252 ir_variable
*var
= node
->as_variable();
8254 if (!var
|| !var
->data
.assigned
)
8257 if (strcmp(var
->name
, "gl_FragColor") == 0)
8258 gl_FragColor_assigned
= true;
8259 else if (strcmp(var
->name
, "gl_FragData") == 0)
8260 gl_FragData_assigned
= true;
8261 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8262 gl_FragSecondaryColor_assigned
= true;
8263 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8264 gl_FragSecondaryData_assigned
= true;
8265 else if (!is_gl_identifier(var
->name
)) {
8266 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8267 var
->data
.mode
== ir_var_shader_out
) {
8268 user_defined_fs_output_assigned
= true;
8269 user_defined_fs_output
= var
;
8274 /* From the GLSL 1.30 spec:
8276 * "If a shader statically assigns a value to gl_FragColor, it
8277 * may not assign a value to any element of gl_FragData. If a
8278 * shader statically writes a value to any element of
8279 * gl_FragData, it may not assign a value to
8280 * gl_FragColor. That is, a shader may assign values to either
8281 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8282 * linked together must also consistently write just one of
8283 * these variables. Similarly, if user declared output
8284 * variables are in use (statically assigned to), then the
8285 * built-in variables gl_FragColor and gl_FragData may not be
8286 * assigned to. These incorrect usages all generate compile
8289 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8290 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8291 "`gl_FragColor' and `gl_FragData'");
8292 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8293 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8294 "`gl_FragColor' and `%s'",
8295 user_defined_fs_output
->name
);
8296 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8297 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8298 "`gl_FragSecondaryColorEXT' and"
8299 " `gl_FragSecondaryDataEXT'");
8300 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8301 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8302 "`gl_FragColor' and"
8303 " `gl_FragSecondaryDataEXT'");
8304 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8305 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8307 " `gl_FragSecondaryColorEXT'");
8308 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8309 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8310 "`gl_FragData' and `%s'",
8311 user_defined_fs_output
->name
);
8314 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8315 !state
->EXT_blend_func_extended_enable
) {
8316 _mesa_glsl_error(&loc
, state
,
8317 "Dual source blending requires EXT_blend_func_extended");
8323 remove_per_vertex_blocks(exec_list
*instructions
,
8324 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8326 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8327 * if it exists in this shader type.
8329 const glsl_type
*per_vertex
= NULL
;
8331 case ir_var_shader_in
:
8332 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8333 per_vertex
= gl_in
->get_interface_type();
8335 case ir_var_shader_out
:
8336 if (ir_variable
*gl_Position
=
8337 state
->symbols
->get_variable("gl_Position")) {
8338 per_vertex
= gl_Position
->get_interface_type();
8342 assert(!"Unexpected mode");
8346 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8347 * need to do anything.
8349 if (per_vertex
== NULL
)
8352 /* If the interface block is used by the shader, then we don't need to do
8355 interface_block_usage_visitor
v(mode
, per_vertex
);
8356 v
.run(instructions
);
8357 if (v
.usage_found())
8360 /* Remove any ir_variable declarations that refer to the interface block
8363 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8364 ir_variable
*const var
= node
->as_variable();
8365 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8366 var
->data
.mode
== mode
) {
8367 state
->symbols
->disable_variable(var
->name
);