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_storage_for_sampler_image_types(ir_variable
*var
,
3297 struct _mesa_glsl_parse_state
*state
,
3300 /* From section 4.1.7 of the GLSL 4.40 spec:
3302 * "[Opaque types] can only be declared as function
3303 * parameters or uniform-qualified variables."
3305 * From section 4.1.7 of the ARB_bindless_texture spec:
3307 * "Samplers may be declared as shader inputs and outputs, as uniform
3308 * variables, as temporary variables, and as function parameters."
3310 * From section 4.1.X of the ARB_bindless_texture spec:
3312 * "Images may be declared as shader inputs and outputs, as uniform
3313 * variables, as temporary variables, and as function parameters."
3315 if (state
->has_bindless()) {
3316 if (var
->data
.mode
!= ir_var_auto
&&
3317 var
->data
.mode
!= ir_var_uniform
&&
3318 var
->data
.mode
!= ir_var_shader_in
&&
3319 var
->data
.mode
!= ir_var_shader_out
&&
3320 var
->data
.mode
!= ir_var_function_in
&&
3321 var
->data
.mode
!= ir_var_function_out
&&
3322 var
->data
.mode
!= ir_var_function_inout
) {
3323 _mesa_glsl_error(loc
, state
, "bindless image/sampler variables may "
3324 "only be declared as shader inputs and outputs, as "
3325 "uniform variables, as temporary variables and as "
3326 "function parameters");
3330 if (var
->data
.mode
!= ir_var_uniform
&&
3331 var
->data
.mode
!= ir_var_function_in
) {
3332 _mesa_glsl_error(loc
, state
, "image/sampler variables may only be "
3333 "declared as function parameters or "
3334 "uniform-qualified global variables");
3342 validate_memory_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3344 const struct ast_type_qualifier
*qual
,
3345 const glsl_type
*type
)
3347 /* From Section 4.10 (Memory Qualifiers) of the GLSL 4.50 spec:
3349 * "Memory qualifiers are only supported in the declarations of image
3350 * variables, buffer variables, and shader storage blocks; it is an error
3351 * to use such qualifiers in any other declarations.
3353 if (!type
->is_image() && !qual
->flags
.q
.buffer
) {
3354 if (qual
->flags
.q
.read_only
||
3355 qual
->flags
.q
.write_only
||
3356 qual
->flags
.q
.coherent
||
3357 qual
->flags
.q
._volatile
||
3358 qual
->flags
.q
.restrict_flag
) {
3359 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied "
3360 "in the declarations of image variables, buffer "
3361 "variables, and shader storage blocks");
3369 validate_image_format_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3371 const struct ast_type_qualifier
*qual
,
3372 const glsl_type
*type
)
3374 /* From section 4.4.6.2 (Format Layout Qualifiers) of the GLSL 4.50 spec:
3376 * "Format layout qualifiers can be used on image variable declarations
3377 * (those declared with a basic type having “image ” in its keyword)."
3379 if (!type
->is_image() && qual
->flags
.q
.explicit_image_format
) {
3380 _mesa_glsl_error(loc
, state
, "format layout qualifiers may only be "
3381 "applied to images");
3388 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3390 struct _mesa_glsl_parse_state
*state
,
3393 const glsl_type
*base_type
= var
->type
->without_array();
3395 if (!validate_image_format_qualifier_for_type(state
, loc
, qual
, base_type
) ||
3396 !validate_memory_qualifier_for_type(state
, loc
, qual
, base_type
))
3399 if (!base_type
->is_image())
3402 if (!validate_storage_for_sampler_image_types(var
, state
, loc
))
3405 var
->data
.memory_read_only
|= qual
->flags
.q
.read_only
;
3406 var
->data
.memory_write_only
|= qual
->flags
.q
.write_only
;
3407 var
->data
.memory_coherent
|= qual
->flags
.q
.coherent
;
3408 var
->data
.memory_volatile
|= qual
->flags
.q
._volatile
;
3409 var
->data
.memory_restrict
|= qual
->flags
.q
.restrict_flag
;
3411 if (qual
->flags
.q
.explicit_image_format
) {
3412 if (var
->data
.mode
== ir_var_function_in
) {
3413 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be used on "
3414 "image function parameters");
3417 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3418 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the base "
3419 "data type of the image");
3422 var
->data
.image_format
= qual
->image_format
;
3424 if (var
->data
.mode
== ir_var_uniform
) {
3425 if (state
->es_shader
) {
3426 _mesa_glsl_error(loc
, state
, "all image uniforms must have a "
3427 "format layout qualifier");
3428 } else if (!qual
->flags
.q
.write_only
) {
3429 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3430 "`writeonly' must have a format layout qualifier");
3433 var
->data
.image_format
= GL_NONE
;
3436 /* From page 70 of the GLSL ES 3.1 specification:
3438 * "Except for image variables qualified with the format qualifiers r32f,
3439 * r32i, and r32ui, image variables must specify either memory qualifier
3440 * readonly or the memory qualifier writeonly."
3442 if (state
->es_shader
&&
3443 var
->data
.image_format
!= GL_R32F
&&
3444 var
->data
.image_format
!= GL_R32I
&&
3445 var
->data
.image_format
!= GL_R32UI
&&
3446 !var
->data
.memory_read_only
&&
3447 !var
->data
.memory_write_only
) {
3448 _mesa_glsl_error(loc
, state
, "image variables of format other than r32f, "
3449 "r32i or r32ui must be qualified `readonly' or "
3454 static inline const char*
3455 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3457 if (origin_upper_left
&& pixel_center_integer
)
3458 return "origin_upper_left, pixel_center_integer";
3459 else if (origin_upper_left
)
3460 return "origin_upper_left";
3461 else if (pixel_center_integer
)
3462 return "pixel_center_integer";
3468 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3469 const struct ast_type_qualifier
*qual
)
3471 /* If gl_FragCoord was previously declared, and the qualifiers were
3472 * different in any way, return true.
3474 if (state
->fs_redeclares_gl_fragcoord
) {
3475 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3476 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3483 validate_array_dimensions(const glsl_type
*t
,
3484 struct _mesa_glsl_parse_state
*state
,
3486 if (t
->is_array()) {
3487 t
= t
->fields
.array
;
3488 while (t
->is_array()) {
3489 if (t
->is_unsized_array()) {
3490 _mesa_glsl_error(loc
, state
,
3491 "only the outermost array dimension can "
3496 t
= t
->fields
.array
;
3502 apply_bindless_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3504 struct _mesa_glsl_parse_state
*state
,
3507 bool has_local_qualifiers
= qual
->flags
.q
.bindless_sampler
||
3508 qual
->flags
.q
.bindless_image
||
3509 qual
->flags
.q
.bound_sampler
||
3510 qual
->flags
.q
.bound_image
;
3512 /* The ARB_bindless_texture spec says:
3514 * "Modify Section 4.4.6 Opaque-Uniform Layout Qualifiers of the GLSL 4.30
3517 * "If these layout qualifiers are applied to other types of default block
3518 * uniforms, or variables with non-uniform storage, a compile-time error
3519 * will be generated."
3521 if (has_local_qualifiers
&& !qual
->flags
.q
.uniform
) {
3522 _mesa_glsl_error(loc
, state
, "ARB_bindless_texture layout qualifiers "
3523 "can only be applied to default block uniforms or "
3524 "variables with uniform storage");
3528 /* The ARB_bindless_texture spec doesn't state anything in this situation,
3529 * but it makes sense to only allow bindless_sampler/bound_sampler for
3530 * sampler types, and respectively bindless_image/bound_image for image
3533 if ((qual
->flags
.q
.bindless_sampler
|| qual
->flags
.q
.bound_sampler
) &&
3534 !var
->type
->contains_sampler()) {
3535 _mesa_glsl_error(loc
, state
, "bindless_sampler or bound_sampler can only "
3536 "be applied to sampler types");
3540 if ((qual
->flags
.q
.bindless_image
|| qual
->flags
.q
.bound_image
) &&
3541 !var
->type
->contains_image()) {
3542 _mesa_glsl_error(loc
, state
, "bindless_image or bound_image can only be "
3543 "applied to image types");
3547 /* The bindless_sampler/bindless_image (and respectively
3548 * bound_sampler/bound_image) layout qualifiers can be set at global and at
3551 if (var
->type
->contains_sampler() || var
->type
->contains_image()) {
3552 var
->data
.bindless
= qual
->flags
.q
.bindless_sampler
||
3553 qual
->flags
.q
.bindless_image
||
3554 state
->bindless_sampler_specified
||
3555 state
->bindless_image_specified
;
3557 var
->data
.bound
= qual
->flags
.q
.bound_sampler
||
3558 qual
->flags
.q
.bound_image
||
3559 state
->bound_sampler_specified
||
3560 state
->bound_image_specified
;
3565 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3567 struct _mesa_glsl_parse_state
*state
,
3570 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3572 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3574 * "Within any shader, the first redeclarations of gl_FragCoord
3575 * must appear before any use of gl_FragCoord."
3577 * Generate a compiler error if above condition is not met by the
3580 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3581 if (earlier
!= NULL
&&
3582 earlier
->data
.used
&&
3583 !state
->fs_redeclares_gl_fragcoord
) {
3584 _mesa_glsl_error(loc
, state
,
3585 "gl_FragCoord used before its first redeclaration "
3586 "in fragment shader");
3589 /* Make sure all gl_FragCoord redeclarations specify the same layout
3592 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3593 const char *const qual_string
=
3594 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3595 qual
->flags
.q
.pixel_center_integer
);
3597 const char *const state_string
=
3598 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3599 state
->fs_pixel_center_integer
);
3601 _mesa_glsl_error(loc
, state
,
3602 "gl_FragCoord redeclared with different layout "
3603 "qualifiers (%s) and (%s) ",
3607 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3608 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3609 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3610 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3611 state
->fs_redeclares_gl_fragcoord
=
3612 state
->fs_origin_upper_left
||
3613 state
->fs_pixel_center_integer
||
3614 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3617 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3618 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3619 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3620 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3621 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3622 ? "origin_upper_left" : "pixel_center_integer";
3624 _mesa_glsl_error(loc
, state
,
3625 "layout qualifier `%s' can only be applied to "
3626 "fragment shader input `gl_FragCoord'",
3630 if (qual
->flags
.q
.explicit_location
) {
3631 apply_explicit_location(qual
, var
, state
, loc
);
3633 if (qual
->flags
.q
.explicit_component
) {
3634 unsigned qual_component
;
3635 if (process_qualifier_constant(state
, loc
, "component",
3636 qual
->component
, &qual_component
)) {
3637 const glsl_type
*type
= var
->type
->without_array();
3638 unsigned components
= type
->component_slots();
3640 if (type
->is_matrix() || type
->is_record()) {
3641 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3642 "cannot be applied to a matrix, a structure, "
3643 "a block, or an array containing any of "
3645 } else if (qual_component
!= 0 &&
3646 (qual_component
+ components
- 1) > 3) {
3647 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3648 (qual_component
+ components
- 1));
3649 } else if (qual_component
== 1 && type
->is_64bit()) {
3650 /* We don't bother checking for 3 as it should be caught by the
3651 * overflow check above.
3653 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3654 "component 1 or 3");
3656 var
->data
.explicit_component
= true;
3657 var
->data
.location_frac
= qual_component
;
3661 } else if (qual
->flags
.q
.explicit_index
) {
3662 if (!qual
->subroutine_list
)
3663 _mesa_glsl_error(loc
, state
,
3664 "explicit index requires explicit location");
3665 } else if (qual
->flags
.q
.explicit_component
) {
3666 _mesa_glsl_error(loc
, state
,
3667 "explicit component requires explicit location");
3670 if (qual
->flags
.q
.explicit_binding
) {
3671 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3674 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3675 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3676 unsigned qual_stream
;
3677 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3679 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3680 var
->data
.stream
= qual_stream
;
3684 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3685 unsigned qual_xfb_buffer
;
3686 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3687 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3688 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3689 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3690 if (qual
->flags
.q
.explicit_xfb_buffer
)
3691 var
->data
.explicit_xfb_buffer
= true;
3695 if (qual
->flags
.q
.explicit_xfb_offset
) {
3696 unsigned qual_xfb_offset
;
3697 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3699 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3700 qual
->offset
, &qual_xfb_offset
) &&
3701 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3702 var
->type
, component_size
)) {
3703 var
->data
.offset
= qual_xfb_offset
;
3704 var
->data
.explicit_xfb_offset
= true;
3708 if (qual
->flags
.q
.explicit_xfb_stride
) {
3709 unsigned qual_xfb_stride
;
3710 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3711 qual
->xfb_stride
, &qual_xfb_stride
)) {
3712 var
->data
.xfb_stride
= qual_xfb_stride
;
3713 var
->data
.explicit_xfb_stride
= true;
3717 if (var
->type
->contains_atomic()) {
3718 if (var
->data
.mode
== ir_var_uniform
) {
3719 if (var
->data
.explicit_binding
) {
3721 &state
->atomic_counter_offsets
[var
->data
.binding
];
3723 if (*offset
% ATOMIC_COUNTER_SIZE
)
3724 _mesa_glsl_error(loc
, state
,
3725 "misaligned atomic counter offset");
3727 var
->data
.offset
= *offset
;
3728 *offset
+= var
->type
->atomic_size();
3731 _mesa_glsl_error(loc
, state
,
3732 "atomic counters require explicit binding point");
3734 } else if (var
->data
.mode
!= ir_var_function_in
) {
3735 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3736 "function parameters or uniform-qualified "
3737 "global variables");
3741 if (var
->type
->contains_sampler() &&
3742 !validate_storage_for_sampler_image_types(var
, state
, loc
))
3745 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3746 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3747 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3748 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3749 * These extensions and all following extensions that add the 'layout'
3750 * keyword have been modified to require the use of 'in' or 'out'.
3752 * The following extension do not allow the deprecated keywords:
3754 * GL_AMD_conservative_depth
3755 * GL_ARB_conservative_depth
3756 * GL_ARB_gpu_shader5
3757 * GL_ARB_separate_shader_objects
3758 * GL_ARB_tessellation_shader
3759 * GL_ARB_transform_feedback3
3760 * GL_ARB_uniform_buffer_object
3762 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3763 * allow layout with the deprecated keywords.
3765 const bool relaxed_layout_qualifier_checking
=
3766 state
->ARB_fragment_coord_conventions_enable
;
3768 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3769 || qual
->flags
.q
.varying
;
3770 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3771 if (relaxed_layout_qualifier_checking
) {
3772 _mesa_glsl_warning(loc
, state
,
3773 "`layout' qualifier may not be used with "
3774 "`attribute' or `varying'");
3776 _mesa_glsl_error(loc
, state
,
3777 "`layout' qualifier may not be used with "
3778 "`attribute' or `varying'");
3782 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3783 * AMD_conservative_depth.
3785 if (qual
->flags
.q
.depth_type
3786 && !state
->is_version(420, 0)
3787 && !state
->AMD_conservative_depth_enable
3788 && !state
->ARB_conservative_depth_enable
) {
3789 _mesa_glsl_error(loc
, state
,
3790 "extension GL_AMD_conservative_depth or "
3791 "GL_ARB_conservative_depth must be enabled "
3792 "to use depth layout qualifiers");
3793 } else if (qual
->flags
.q
.depth_type
3794 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3795 _mesa_glsl_error(loc
, state
,
3796 "depth layout qualifiers can be applied only to "
3800 switch (qual
->depth_type
) {
3802 var
->data
.depth_layout
= ir_depth_layout_any
;
3804 case ast_depth_greater
:
3805 var
->data
.depth_layout
= ir_depth_layout_greater
;
3807 case ast_depth_less
:
3808 var
->data
.depth_layout
= ir_depth_layout_less
;
3810 case ast_depth_unchanged
:
3811 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3814 var
->data
.depth_layout
= ir_depth_layout_none
;
3818 if (qual
->flags
.q
.std140
||
3819 qual
->flags
.q
.std430
||
3820 qual
->flags
.q
.packed
||
3821 qual
->flags
.q
.shared
) {
3822 _mesa_glsl_error(loc
, state
,
3823 "uniform and shader storage block layout qualifiers "
3824 "std140, std430, packed, and shared can only be "
3825 "applied to uniform or shader storage blocks, not "
3829 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3830 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3833 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3836 * "Fragment shaders also allow the following layout qualifier on in only
3837 * (not with variable declarations)
3838 * layout-qualifier-id
3839 * early_fragment_tests
3842 if (qual
->flags
.q
.early_fragment_tests
) {
3843 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3844 "valid in fragment shader input layout declaration.");
3847 if (qual
->flags
.q
.inner_coverage
) {
3848 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3849 "valid in fragment shader input layout declaration.");
3852 if (qual
->flags
.q
.post_depth_coverage
) {
3853 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3854 "valid in fragment shader input layout declaration.");
3857 if (state
->has_bindless())
3858 apply_bindless_qualifier_to_variable(qual
, var
, state
, loc
);
3862 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3864 struct _mesa_glsl_parse_state
*state
,
3868 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3870 if (qual
->flags
.q
.invariant
) {
3871 if (var
->data
.used
) {
3872 _mesa_glsl_error(loc
, state
,
3873 "variable `%s' may not be redeclared "
3874 "`invariant' after being used",
3877 var
->data
.invariant
= 1;
3881 if (qual
->flags
.q
.precise
) {
3882 if (var
->data
.used
) {
3883 _mesa_glsl_error(loc
, state
,
3884 "variable `%s' may not be redeclared "
3885 "`precise' after being used",
3888 var
->data
.precise
= 1;
3892 if (qual
->is_subroutine_decl() && !qual
->flags
.q
.uniform
) {
3893 _mesa_glsl_error(loc
, state
,
3894 "`subroutine' may only be applied to uniforms, "
3895 "subroutine type declarations, or function definitions");
3898 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3899 || qual
->flags
.q
.uniform
3900 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3901 var
->data
.read_only
= 1;
3903 if (qual
->flags
.q
.centroid
)
3904 var
->data
.centroid
= 1;
3906 if (qual
->flags
.q
.sample
)
3907 var
->data
.sample
= 1;
3909 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3910 if (state
->es_shader
) {
3911 var
->data
.precision
=
3912 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3915 if (qual
->flags
.q
.patch
)
3916 var
->data
.patch
= 1;
3918 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3919 var
->type
= glsl_type::error_type
;
3920 _mesa_glsl_error(loc
, state
,
3921 "`attribute' variables may not be declared in the "
3923 _mesa_shader_stage_to_string(state
->stage
));
3926 /* Disallow layout qualifiers which may only appear on layout declarations. */
3927 if (qual
->flags
.q
.prim_type
) {
3928 _mesa_glsl_error(loc
, state
,
3929 "Primitive type may only be specified on GS input or output "
3930 "layout declaration, not on variables.");
3933 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3935 * "However, the const qualifier cannot be used with out or inout."
3937 * The same section of the GLSL 4.40 spec further clarifies this saying:
3939 * "The const qualifier cannot be used with out or inout, or a
3940 * compile-time error results."
3942 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3943 _mesa_glsl_error(loc
, state
,
3944 "`const' may not be applied to `out' or `inout' "
3945 "function parameters");
3948 /* If there is no qualifier that changes the mode of the variable, leave
3949 * the setting alone.
3951 assert(var
->data
.mode
!= ir_var_temporary
);
3952 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3953 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
3954 else if (qual
->flags
.q
.in
)
3955 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3956 else if (qual
->flags
.q
.attribute
3957 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3958 var
->data
.mode
= ir_var_shader_in
;
3959 else if (qual
->flags
.q
.out
)
3960 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3961 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3962 var
->data
.mode
= ir_var_shader_out
;
3963 else if (qual
->flags
.q
.uniform
)
3964 var
->data
.mode
= ir_var_uniform
;
3965 else if (qual
->flags
.q
.buffer
)
3966 var
->data
.mode
= ir_var_shader_storage
;
3967 else if (qual
->flags
.q
.shared_storage
)
3968 var
->data
.mode
= ir_var_shader_shared
;
3970 var
->data
.fb_fetch_output
= state
->stage
== MESA_SHADER_FRAGMENT
&&
3971 qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
3973 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3974 /* User-defined ins/outs are not permitted in compute shaders. */
3975 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3976 _mesa_glsl_error(loc
, state
,
3977 "user-defined input and output variables are not "
3978 "permitted in compute shaders");
3981 /* This variable is being used to link data between shader stages (in
3982 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3983 * that is allowed for such purposes.
3985 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3987 * "The varying qualifier can be used only with the data types
3988 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3991 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3992 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3994 * "Fragment inputs can only be signed and unsigned integers and
3995 * integer vectors, float, floating-point vectors, matrices, or
3996 * arrays of these. Structures cannot be input.
3998 * Similar text exists in the section on vertex shader outputs.
4000 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
4001 * 3.00 spec allows structs as well. Varying structs are also allowed
4004 switch (var
->type
->without_array()->base_type
) {
4005 case GLSL_TYPE_FLOAT
:
4006 /* Ok in all GLSL versions */
4008 case GLSL_TYPE_UINT
:
4010 if (state
->is_version(130, 300))
4012 _mesa_glsl_error(loc
, state
,
4013 "varying variables must be of base type float in %s",
4014 state
->get_version_string());
4016 case GLSL_TYPE_STRUCT
:
4017 if (state
->is_version(150, 300))
4019 _mesa_glsl_error(loc
, state
,
4020 "varying variables may not be of type struct");
4022 case GLSL_TYPE_DOUBLE
:
4023 case GLSL_TYPE_UINT64
:
4024 case GLSL_TYPE_INT64
:
4027 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
4032 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
4033 switch (state
->stage
) {
4034 case MESA_SHADER_VERTEX
:
4035 if (var
->data
.mode
== ir_var_shader_out
)
4036 var
->data
.invariant
= true;
4038 case MESA_SHADER_TESS_CTRL
:
4039 case MESA_SHADER_TESS_EVAL
:
4040 case MESA_SHADER_GEOMETRY
:
4041 if ((var
->data
.mode
== ir_var_shader_in
)
4042 || (var
->data
.mode
== ir_var_shader_out
))
4043 var
->data
.invariant
= true;
4045 case MESA_SHADER_FRAGMENT
:
4046 if (var
->data
.mode
== ir_var_shader_in
)
4047 var
->data
.invariant
= true;
4049 case MESA_SHADER_COMPUTE
:
4050 /* Invariance isn't meaningful in compute shaders. */
4055 var
->data
.interpolation
=
4056 interpret_interpolation_qualifier(qual
, var
->type
,
4057 (ir_variable_mode
) var
->data
.mode
,
4060 /* Does the declaration use the deprecated 'attribute' or 'varying'
4063 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
4064 || qual
->flags
.q
.varying
;
4067 /* Validate auxiliary storage qualifiers */
4069 /* From section 4.3.4 of the GLSL 1.30 spec:
4070 * "It is an error to use centroid in in a vertex shader."
4072 * From section 4.3.4 of the GLSL ES 3.00 spec:
4073 * "It is an error to use centroid in or interpolation qualifiers in
4074 * a vertex shader input."
4077 /* Section 4.3.6 of the GLSL 1.30 specification states:
4078 * "It is an error to use centroid out in a fragment shader."
4080 * The GL_ARB_shading_language_420pack extension specification states:
4081 * "It is an error to use auxiliary storage qualifiers or interpolation
4082 * qualifiers on an output in a fragment shader."
4084 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
4085 _mesa_glsl_error(loc
, state
,
4086 "sample qualifier may only be used on `in` or `out` "
4087 "variables between shader stages");
4089 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
4090 _mesa_glsl_error(loc
, state
,
4091 "centroid qualifier may only be used with `in', "
4092 "`out' or `varying' variables between shader stages");
4095 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
4096 _mesa_glsl_error(loc
, state
,
4097 "the shared storage qualifiers can only be used with "
4101 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
4105 * Get the variable that is being redeclared by this declaration or if it
4106 * does not exist, the current declared variable.
4108 * Semantic checks to verify the validity of the redeclaration are also
4109 * performed. If semantic checks fail, compilation error will be emitted via
4110 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
4113 * A pointer to an existing variable in the current scope if the declaration
4114 * is a redeclaration, current variable otherwise. \c is_declared boolean
4115 * will return \c true if the declaration is a redeclaration, \c false
4118 static ir_variable
*
4119 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
4120 struct _mesa_glsl_parse_state
*state
,
4121 bool allow_all_redeclarations
,
4122 bool *is_redeclaration
)
4124 /* Check if this declaration is actually a re-declaration, either to
4125 * resize an array or add qualifiers to an existing variable.
4127 * This is allowed for variables in the current scope, or when at
4128 * global scope (for built-ins in the implicit outer scope).
4130 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
4131 if (earlier
== NULL
||
4132 (state
->current_function
!= NULL
&&
4133 !state
->symbols
->name_declared_this_scope(var
->name
))) {
4134 *is_redeclaration
= false;
4138 *is_redeclaration
= true;
4140 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4142 * "It is legal to declare an array without a size and then
4143 * later re-declare the same name as an array of the same
4144 * type and specify a size."
4146 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
4147 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
4148 /* FINISHME: This doesn't match the qualifiers on the two
4149 * FINISHME: declarations. It's not 100% clear whether this is
4150 * FINISHME: required or not.
4153 const int size
= var
->type
->array_size();
4154 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
4155 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4156 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4158 earlier
->data
.max_array_access
);
4161 earlier
->type
= var
->type
;
4164 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4165 state
->is_version(150, 0))
4166 && strcmp(var
->name
, "gl_FragCoord") == 0
4167 && earlier
->type
== var
->type
4168 && var
->data
.mode
== ir_var_shader_in
) {
4169 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4172 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
4173 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
4175 /* According to section 4.3.7 of the GLSL 1.30 spec,
4176 * the following built-in varaibles can be redeclared with an
4177 * interpolation qualifier:
4180 * * gl_FrontSecondaryColor
4181 * * gl_BackSecondaryColor
4183 * * gl_SecondaryColor
4185 } else if (state
->is_version(130, 0)
4186 && (strcmp(var
->name
, "gl_FrontColor") == 0
4187 || strcmp(var
->name
, "gl_BackColor") == 0
4188 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4189 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4190 || strcmp(var
->name
, "gl_Color") == 0
4191 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
4192 && earlier
->type
== var
->type
4193 && earlier
->data
.mode
== var
->data
.mode
) {
4194 earlier
->data
.interpolation
= var
->data
.interpolation
;
4196 /* Layout qualifiers for gl_FragDepth. */
4197 } else if ((state
->is_version(420, 0) ||
4198 state
->AMD_conservative_depth_enable
||
4199 state
->ARB_conservative_depth_enable
)
4200 && strcmp(var
->name
, "gl_FragDepth") == 0
4201 && earlier
->type
== var
->type
4202 && earlier
->data
.mode
== var
->data
.mode
) {
4204 /** From the AMD_conservative_depth spec:
4205 * Within any shader, the first redeclarations of gl_FragDepth
4206 * must appear before any use of gl_FragDepth.
4208 if (earlier
->data
.used
) {
4209 _mesa_glsl_error(&loc
, state
,
4210 "the first redeclaration of gl_FragDepth "
4211 "must appear before any use of gl_FragDepth");
4214 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4215 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4216 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4217 _mesa_glsl_error(&loc
, state
,
4218 "gl_FragDepth: depth layout is declared here "
4219 "as '%s, but it was previously declared as "
4221 depth_layout_string(var
->data
.depth_layout
),
4222 depth_layout_string(earlier
->data
.depth_layout
));
4225 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4227 } else if (state
->has_framebuffer_fetch() &&
4228 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4229 var
->type
== earlier
->type
&&
4230 var
->data
.mode
== ir_var_auto
) {
4231 /* According to the EXT_shader_framebuffer_fetch spec:
4233 * "By default, gl_LastFragData is declared with the mediump precision
4234 * qualifier. This can be changed by redeclaring the corresponding
4235 * variables with the desired precision qualifier."
4237 earlier
->data
.precision
= var
->data
.precision
;
4239 } else if (allow_all_redeclarations
) {
4240 if (earlier
->data
.mode
!= var
->data
.mode
) {
4241 _mesa_glsl_error(&loc
, state
,
4242 "redeclaration of `%s' with incorrect qualifiers",
4244 } else if (earlier
->type
!= var
->type
) {
4245 _mesa_glsl_error(&loc
, state
,
4246 "redeclaration of `%s' has incorrect type",
4250 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4257 * Generate the IR for an initializer in a variable declaration
4260 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4261 ast_fully_specified_type
*type
,
4262 exec_list
*initializer_instructions
,
4263 struct _mesa_glsl_parse_state
*state
)
4265 ir_rvalue
*result
= NULL
;
4267 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4269 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4271 * "All uniform variables are read-only and are initialized either
4272 * directly by an application via API commands, or indirectly by
4275 if (var
->data
.mode
== ir_var_uniform
) {
4276 state
->check_version(120, 0, &initializer_loc
,
4277 "cannot initialize uniform %s",
4281 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4283 * "Buffer variables cannot have initializers."
4285 if (var
->data
.mode
== ir_var_shader_storage
) {
4286 _mesa_glsl_error(&initializer_loc
, state
,
4287 "cannot initialize buffer variable %s",
4291 /* From section 4.1.7 of the GLSL 4.40 spec:
4293 * "Opaque variables [...] are initialized only through the
4294 * OpenGL API; they cannot be declared with an initializer in a
4297 if (var
->type
->contains_opaque()) {
4298 _mesa_glsl_error(&initializer_loc
, state
,
4299 "cannot initialize opaque variable %s",
4303 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4304 _mesa_glsl_error(&initializer_loc
, state
,
4305 "cannot initialize %s shader input / %s %s",
4306 _mesa_shader_stage_to_string(state
->stage
),
4307 (state
->stage
== MESA_SHADER_VERTEX
)
4308 ? "attribute" : "varying",
4312 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4313 _mesa_glsl_error(&initializer_loc
, state
,
4314 "cannot initialize %s shader output %s",
4315 _mesa_shader_stage_to_string(state
->stage
),
4319 /* If the initializer is an ast_aggregate_initializer, recursively store
4320 * type information from the LHS into it, so that its hir() function can do
4323 if (decl
->initializer
->oper
== ast_aggregate
)
4324 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4326 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4327 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4329 /* Calculate the constant value if this is a const or uniform
4332 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4334 * "Declarations of globals without a storage qualifier, or with
4335 * just the const qualifier, may include initializers, in which case
4336 * they will be initialized before the first line of main() is
4337 * executed. Such initializers must be a constant expression."
4339 * The same section of the GLSL ES 3.00.4 spec has similar language.
4341 if (type
->qualifier
.flags
.q
.constant
4342 || type
->qualifier
.flags
.q
.uniform
4343 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4344 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4346 if (new_rhs
!= NULL
) {
4349 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4352 * "A constant expression is one of
4356 * - an expression formed by an operator on operands that are
4357 * all constant expressions, including getting an element of
4358 * a constant array, or a field of a constant structure, or
4359 * components of a constant vector. However, the sequence
4360 * operator ( , ) and the assignment operators ( =, +=, ...)
4361 * are not included in the operators that can create a
4362 * constant expression."
4364 * Section 12.43 (Sequence operator and constant expressions) says:
4366 * "Should the following construct be allowed?
4370 * The expression within the brackets uses the sequence operator
4371 * (',') and returns the integer 3 so the construct is declaring
4372 * a single-dimensional array of size 3. In some languages, the
4373 * construct declares a two-dimensional array. It would be
4374 * preferable to make this construct illegal to avoid confusion.
4376 * One possibility is to change the definition of the sequence
4377 * operator so that it does not return a constant-expression and
4378 * hence cannot be used to declare an array size.
4380 * RESOLUTION: The result of a sequence operator is not a
4381 * constant-expression."
4383 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4384 * contains language almost identical to the section 4.3.3 in the
4385 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4388 ir_constant
*constant_value
= rhs
->constant_expression_value();
4389 if (!constant_value
||
4390 (state
->is_version(430, 300) &&
4391 decl
->initializer
->has_sequence_subexpression())) {
4392 const char *const variable_mode
=
4393 (type
->qualifier
.flags
.q
.constant
)
4395 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4397 /* If ARB_shading_language_420pack is enabled, initializers of
4398 * const-qualified local variables do not have to be constant
4399 * expressions. Const-qualified global variables must still be
4400 * initialized with constant expressions.
4402 if (!state
->has_420pack()
4403 || state
->current_function
== NULL
) {
4404 _mesa_glsl_error(& initializer_loc
, state
,
4405 "initializer of %s variable `%s' must be a "
4406 "constant expression",
4409 if (var
->type
->is_numeric()) {
4410 /* Reduce cascading errors. */
4411 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4412 ? ir_constant::zero(state
, var
->type
) : NULL
;
4416 rhs
= constant_value
;
4417 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4418 ? constant_value
: NULL
;
4421 if (var
->type
->is_numeric()) {
4422 /* Reduce cascading errors. */
4423 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4424 ? ir_constant::zero(state
, var
->type
) : NULL
;
4429 if (rhs
&& !rhs
->type
->is_error()) {
4430 bool temp
= var
->data
.read_only
;
4431 if (type
->qualifier
.flags
.q
.constant
)
4432 var
->data
.read_only
= false;
4434 /* Never emit code to initialize a uniform.
4436 const glsl_type
*initializer_type
;
4437 if (!type
->qualifier
.flags
.q
.uniform
) {
4438 do_assignment(initializer_instructions
, state
,
4443 type
->get_location());
4444 initializer_type
= result
->type
;
4446 initializer_type
= rhs
->type
;
4448 var
->constant_initializer
= rhs
->constant_expression_value();
4449 var
->data
.has_initializer
= true;
4451 /* If the declared variable is an unsized array, it must inherrit
4452 * its full type from the initializer. A declaration such as
4454 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4458 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4460 * The assignment generated in the if-statement (below) will also
4461 * automatically handle this case for non-uniforms.
4463 * If the declared variable is not an array, the types must
4464 * already match exactly. As a result, the type assignment
4465 * here can be done unconditionally. For non-uniforms the call
4466 * to do_assignment can change the type of the initializer (via
4467 * the implicit conversion rules). For uniforms the initializer
4468 * must be a constant expression, and the type of that expression
4469 * was validated above.
4471 var
->type
= initializer_type
;
4473 var
->data
.read_only
= temp
;
4480 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4481 YYLTYPE loc
, ir_variable
*var
,
4482 unsigned num_vertices
,
4484 const char *var_category
)
4486 if (var
->type
->is_unsized_array()) {
4487 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4489 * All geometry shader input unsized array declarations will be
4490 * sized by an earlier input layout qualifier, when present, as per
4491 * the following table.
4493 * Followed by a table mapping each allowed input layout qualifier to
4494 * the corresponding input length.
4496 * Similarly for tessellation control shader outputs.
4498 if (num_vertices
!= 0)
4499 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4502 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4503 * includes the following examples of compile-time errors:
4505 * // code sequence within one shader...
4506 * in vec4 Color1[]; // size unknown
4507 * ...Color1.length()...// illegal, length() unknown
4508 * in vec4 Color2[2]; // size is 2
4509 * ...Color1.length()...// illegal, Color1 still has no size
4510 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4511 * layout(lines) in; // legal, input size is 2, matching
4512 * in vec4 Color4[3]; // illegal, contradicts layout
4515 * To detect the case illustrated by Color3, we verify that the size of
4516 * an explicitly-sized array matches the size of any previously declared
4517 * explicitly-sized array. To detect the case illustrated by Color4, we
4518 * verify that the size of an explicitly-sized array is consistent with
4519 * any previously declared input layout.
4521 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4522 _mesa_glsl_error(&loc
, state
,
4523 "%s size contradicts previously declared layout "
4524 "(size is %u, but layout requires a size of %u)",
4525 var_category
, var
->type
->length
, num_vertices
);
4526 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4527 _mesa_glsl_error(&loc
, state
,
4528 "%s sizes are inconsistent (size is %u, but a "
4529 "previous declaration has size %u)",
4530 var_category
, var
->type
->length
, *size
);
4532 *size
= var
->type
->length
;
4538 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4539 YYLTYPE loc
, ir_variable
*var
)
4541 unsigned num_vertices
= 0;
4543 if (state
->tcs_output_vertices_specified
) {
4544 if (!state
->out_qualifier
->vertices
->
4545 process_qualifier_constant(state
, "vertices",
4546 &num_vertices
, false)) {
4550 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4551 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4552 "GL_MAX_PATCH_VERTICES", num_vertices
);
4557 if (!var
->type
->is_array() && !var
->data
.patch
) {
4558 _mesa_glsl_error(&loc
, state
,
4559 "tessellation control shader outputs must be arrays");
4561 /* To avoid cascading failures, short circuit the checks below. */
4565 if (var
->data
.patch
)
4568 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4569 &state
->tcs_output_size
,
4570 "tessellation control shader output");
4574 * Do additional processing necessary for tessellation control/evaluation shader
4575 * input declarations. This covers both interface block arrays and bare input
4579 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4580 YYLTYPE loc
, ir_variable
*var
)
4582 if (!var
->type
->is_array() && !var
->data
.patch
) {
4583 _mesa_glsl_error(&loc
, state
,
4584 "per-vertex tessellation shader inputs must be arrays");
4585 /* Avoid cascading failures. */
4589 if (var
->data
.patch
)
4592 /* The ARB_tessellation_shader spec says:
4594 * "Declaring an array size is optional. If no size is specified, it
4595 * will be taken from the implementation-dependent maximum patch size
4596 * (gl_MaxPatchVertices). If a size is specified, it must match the
4597 * maximum patch size; otherwise, a compile or link error will occur."
4599 * This text appears twice, once for TCS inputs, and again for TES inputs.
4601 if (var
->type
->is_unsized_array()) {
4602 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4603 state
->Const
.MaxPatchVertices
);
4604 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4605 _mesa_glsl_error(&loc
, state
,
4606 "per-vertex tessellation shader input arrays must be "
4607 "sized to gl_MaxPatchVertices (%d).",
4608 state
->Const
.MaxPatchVertices
);
4614 * Do additional processing necessary for geometry shader input declarations
4615 * (this covers both interface blocks arrays and bare input variables).
4618 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4619 YYLTYPE loc
, ir_variable
*var
)
4621 unsigned num_vertices
= 0;
4623 if (state
->gs_input_prim_type_specified
) {
4624 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4627 /* Geometry shader input variables must be arrays. Caller should have
4628 * reported an error for this.
4630 if (!var
->type
->is_array()) {
4631 assert(state
->error
);
4633 /* To avoid cascading failures, short circuit the checks below. */
4637 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4638 &state
->gs_input_size
,
4639 "geometry shader input");
4643 validate_identifier(const char *identifier
, YYLTYPE loc
,
4644 struct _mesa_glsl_parse_state
*state
)
4646 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4648 * "Identifiers starting with "gl_" are reserved for use by
4649 * OpenGL, and may not be declared in a shader as either a
4650 * variable or a function."
4652 if (is_gl_identifier(identifier
)) {
4653 _mesa_glsl_error(&loc
, state
,
4654 "identifier `%s' uses reserved `gl_' prefix",
4656 } else if (strstr(identifier
, "__")) {
4657 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4660 * "In addition, all identifiers containing two
4661 * consecutive underscores (__) are reserved as
4662 * possible future keywords."
4664 * The intention is that names containing __ are reserved for internal
4665 * use by the implementation, and names prefixed with GL_ are reserved
4666 * for use by Khronos. Names simply containing __ are dangerous to use,
4667 * but should be allowed.
4669 * A future version of the GLSL specification will clarify this.
4671 _mesa_glsl_warning(&loc
, state
,
4672 "identifier `%s' uses reserved `__' string",
4678 ast_declarator_list::hir(exec_list
*instructions
,
4679 struct _mesa_glsl_parse_state
*state
)
4682 const struct glsl_type
*decl_type
;
4683 const char *type_name
= NULL
;
4684 ir_rvalue
*result
= NULL
;
4685 YYLTYPE loc
= this->get_location();
4687 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4689 * "To ensure that a particular output variable is invariant, it is
4690 * necessary to use the invariant qualifier. It can either be used to
4691 * qualify a previously declared variable as being invariant
4693 * invariant gl_Position; // make existing gl_Position be invariant"
4695 * In these cases the parser will set the 'invariant' flag in the declarator
4696 * list, and the type will be NULL.
4698 if (this->invariant
) {
4699 assert(this->type
== NULL
);
4701 if (state
->current_function
!= NULL
) {
4702 _mesa_glsl_error(& loc
, state
,
4703 "all uses of `invariant' keyword must be at global "
4707 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4708 assert(decl
->array_specifier
== NULL
);
4709 assert(decl
->initializer
== NULL
);
4711 ir_variable
*const earlier
=
4712 state
->symbols
->get_variable(decl
->identifier
);
4713 if (earlier
== NULL
) {
4714 _mesa_glsl_error(& loc
, state
,
4715 "undeclared variable `%s' cannot be marked "
4716 "invariant", decl
->identifier
);
4717 } else if (!is_allowed_invariant(earlier
, state
)) {
4718 _mesa_glsl_error(&loc
, state
,
4719 "`%s' cannot be marked invariant; interfaces between "
4720 "shader stages only.", decl
->identifier
);
4721 } else if (earlier
->data
.used
) {
4722 _mesa_glsl_error(& loc
, state
,
4723 "variable `%s' may not be redeclared "
4724 "`invariant' after being used",
4727 earlier
->data
.invariant
= true;
4731 /* Invariant redeclarations do not have r-values.
4736 if (this->precise
) {
4737 assert(this->type
== NULL
);
4739 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4740 assert(decl
->array_specifier
== NULL
);
4741 assert(decl
->initializer
== NULL
);
4743 ir_variable
*const earlier
=
4744 state
->symbols
->get_variable(decl
->identifier
);
4745 if (earlier
== NULL
) {
4746 _mesa_glsl_error(& loc
, state
,
4747 "undeclared variable `%s' cannot be marked "
4748 "precise", decl
->identifier
);
4749 } else if (state
->current_function
!= NULL
&&
4750 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4751 /* Note: we have to check if we're in a function, since
4752 * builtins are treated as having come from another scope.
4754 _mesa_glsl_error(& loc
, state
,
4755 "variable `%s' from an outer scope may not be "
4756 "redeclared `precise' in this scope",
4758 } else if (earlier
->data
.used
) {
4759 _mesa_glsl_error(& loc
, state
,
4760 "variable `%s' may not be redeclared "
4761 "`precise' after being used",
4764 earlier
->data
.precise
= true;
4768 /* Precise redeclarations do not have r-values either. */
4772 assert(this->type
!= NULL
);
4773 assert(!this->invariant
);
4774 assert(!this->precise
);
4776 /* The type specifier may contain a structure definition. Process that
4777 * before any of the variable declarations.
4779 (void) this->type
->specifier
->hir(instructions
, state
);
4781 decl_type
= this->type
->glsl_type(& type_name
, state
);
4783 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4784 * "Buffer variables may only be declared inside interface blocks
4785 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4786 * shader storage blocks. It is a compile-time error to declare buffer
4787 * variables at global scope (outside a block)."
4789 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4790 _mesa_glsl_error(&loc
, state
,
4791 "buffer variables cannot be declared outside "
4792 "interface blocks");
4795 /* An offset-qualified atomic counter declaration sets the default
4796 * offset for the next declaration within the same atomic counter
4799 if (decl_type
&& decl_type
->contains_atomic()) {
4800 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4801 type
->qualifier
.flags
.q
.explicit_offset
) {
4802 unsigned qual_binding
;
4803 unsigned qual_offset
;
4804 if (process_qualifier_constant(state
, &loc
, "binding",
4805 type
->qualifier
.binding
,
4807 && process_qualifier_constant(state
, &loc
, "offset",
4808 type
->qualifier
.offset
,
4810 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4814 ast_type_qualifier allowed_atomic_qual_mask
;
4815 allowed_atomic_qual_mask
.flags
.i
= 0;
4816 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4817 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4818 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4820 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4821 "invalid layout qualifier for",
4825 if (this->declarations
.is_empty()) {
4826 /* If there is no structure involved in the program text, there are two
4827 * possible scenarios:
4829 * - The program text contained something like 'vec4;'. This is an
4830 * empty declaration. It is valid but weird. Emit a warning.
4832 * - The program text contained something like 'S;' and 'S' is not the
4833 * name of a known structure type. This is both invalid and weird.
4836 * - The program text contained something like 'mediump float;'
4837 * when the programmer probably meant 'precision mediump
4838 * float;' Emit a warning with a description of what they
4839 * probably meant to do.
4841 * Note that if decl_type is NULL and there is a structure involved,
4842 * there must have been some sort of error with the structure. In this
4843 * case we assume that an error was already generated on this line of
4844 * code for the structure. There is no need to generate an additional,
4847 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4850 if (decl_type
== NULL
) {
4851 _mesa_glsl_error(&loc
, state
,
4852 "invalid type `%s' in empty declaration",
4855 if (decl_type
->is_array()) {
4856 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4859 * "... any declaration that leaves the size undefined is
4860 * disallowed as this would add complexity and there are no
4863 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4864 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4865 "or implicitly defined");
4868 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4870 * "The combinations of types and qualifiers that cause
4871 * compile-time or link-time errors are the same whether or not
4872 * the declaration is empty."
4874 validate_array_dimensions(decl_type
, state
, &loc
);
4877 if (decl_type
->is_atomic_uint()) {
4878 /* Empty atomic counter declarations are allowed and useful
4879 * to set the default offset qualifier.
4882 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4883 if (this->type
->specifier
->structure
!= NULL
) {
4884 _mesa_glsl_error(&loc
, state
,
4885 "precision qualifiers can't be applied "
4888 static const char *const precision_names
[] = {
4895 _mesa_glsl_warning(&loc
, state
,
4896 "empty declaration with precision "
4897 "qualifier, to set the default precision, "
4898 "use `precision %s %s;'",
4899 precision_names
[this->type
->
4900 qualifier
.precision
],
4903 } else if (this->type
->specifier
->structure
== NULL
) {
4904 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4909 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4910 const struct glsl_type
*var_type
;
4912 const char *identifier
= decl
->identifier
;
4913 /* FINISHME: Emit a warning if a variable declaration shadows a
4914 * FINISHME: declaration at a higher scope.
4917 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4918 if (type_name
!= NULL
) {
4919 _mesa_glsl_error(& loc
, state
,
4920 "invalid type `%s' in declaration of `%s'",
4921 type_name
, decl
->identifier
);
4923 _mesa_glsl_error(& loc
, state
,
4924 "invalid type in declaration of `%s'",
4930 if (this->type
->qualifier
.is_subroutine_decl()) {
4934 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4936 _mesa_glsl_error(& loc
, state
,
4937 "invalid type in declaration of `%s'",
4939 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4944 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4947 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4949 /* The 'varying in' and 'varying out' qualifiers can only be used with
4950 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4953 if (this->type
->qualifier
.flags
.q
.varying
) {
4954 if (this->type
->qualifier
.flags
.q
.in
) {
4955 _mesa_glsl_error(& loc
, state
,
4956 "`varying in' qualifier in declaration of "
4957 "`%s' only valid for geometry shaders using "
4958 "ARB_geometry_shader4 or EXT_geometry_shader4",
4960 } else if (this->type
->qualifier
.flags
.q
.out
) {
4961 _mesa_glsl_error(& loc
, state
,
4962 "`varying out' qualifier in declaration of "
4963 "`%s' only valid for geometry shaders using "
4964 "ARB_geometry_shader4 or EXT_geometry_shader4",
4969 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4971 * "Global variables can only use the qualifiers const,
4972 * attribute, uniform, or varying. Only one may be
4975 * Local variables can only use the qualifier const."
4977 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4978 * any extension that adds the 'layout' keyword.
4980 if (!state
->is_version(130, 300)
4981 && !state
->has_explicit_attrib_location()
4982 && !state
->has_separate_shader_objects()
4983 && !state
->ARB_fragment_coord_conventions_enable
) {
4984 if (this->type
->qualifier
.flags
.q
.out
) {
4985 _mesa_glsl_error(& loc
, state
,
4986 "`out' qualifier in declaration of `%s' "
4987 "only valid for function parameters in %s",
4988 decl
->identifier
, state
->get_version_string());
4990 if (this->type
->qualifier
.flags
.q
.in
) {
4991 _mesa_glsl_error(& loc
, state
,
4992 "`in' qualifier in declaration of `%s' "
4993 "only valid for function parameters in %s",
4994 decl
->identifier
, state
->get_version_string());
4996 /* FINISHME: Test for other invalid qualifiers. */
4999 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
5001 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
5004 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
5005 && (var
->type
->is_numeric() || var
->type
->is_boolean())
5006 && state
->zero_init
) {
5007 const ir_constant_data data
= { { 0 } };
5008 var
->data
.has_initializer
= true;
5009 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
5012 if (this->type
->qualifier
.flags
.q
.invariant
) {
5013 if (!is_allowed_invariant(var
, state
)) {
5014 _mesa_glsl_error(&loc
, state
,
5015 "`%s' cannot be marked invariant; interfaces between "
5016 "shader stages only", var
->name
);
5020 if (state
->current_function
!= NULL
) {
5021 const char *mode
= NULL
;
5022 const char *extra
= "";
5024 /* There is no need to check for 'inout' here because the parser will
5025 * only allow that in function parameter lists.
5027 if (this->type
->qualifier
.flags
.q
.attribute
) {
5029 } else if (this->type
->qualifier
.is_subroutine_decl()) {
5030 mode
= "subroutine uniform";
5031 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
5033 } else if (this->type
->qualifier
.flags
.q
.varying
) {
5035 } else if (this->type
->qualifier
.flags
.q
.in
) {
5037 extra
= " or in function parameter list";
5038 } else if (this->type
->qualifier
.flags
.q
.out
) {
5040 extra
= " or in function parameter list";
5044 _mesa_glsl_error(& loc
, state
,
5045 "%s variable `%s' must be declared at "
5047 mode
, var
->name
, extra
);
5049 } else if (var
->data
.mode
== ir_var_shader_in
) {
5050 var
->data
.read_only
= true;
5052 if (state
->stage
== MESA_SHADER_VERTEX
) {
5053 bool error_emitted
= false;
5055 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
5057 * "Vertex shader inputs can only be float, floating-point
5058 * vectors, matrices, signed and unsigned integers and integer
5059 * vectors. Vertex shader inputs can also form arrays of these
5060 * types, but not structures."
5062 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
5064 * "Vertex shader inputs can only be float, floating-point
5065 * vectors, matrices, signed and unsigned integers and integer
5066 * vectors. They cannot be arrays or structures."
5068 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
5070 * "The attribute qualifier can be used only with float,
5071 * floating-point vectors, and matrices. Attribute variables
5072 * cannot be declared as arrays or structures."
5074 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
5076 * "Vertex shader inputs can only be float, floating-point
5077 * vectors, matrices, signed and unsigned integers and integer
5078 * vectors. Vertex shader inputs cannot be arrays or
5081 const glsl_type
*check_type
= var
->type
->without_array();
5083 switch (check_type
->base_type
) {
5084 case GLSL_TYPE_FLOAT
:
5086 case GLSL_TYPE_UINT64
:
5087 case GLSL_TYPE_INT64
:
5089 case GLSL_TYPE_UINT
:
5091 if (state
->is_version(120, 300))
5093 case GLSL_TYPE_DOUBLE
:
5094 if (check_type
->is_double() && (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
5098 _mesa_glsl_error(& loc
, state
,
5099 "vertex shader input / attribute cannot have "
5101 var
->type
->is_array() ? "array of " : "",
5103 error_emitted
= true;
5106 if (!error_emitted
&& var
->type
->is_array() &&
5107 !state
->check_version(150, 0, &loc
,
5108 "vertex shader input / attribute "
5109 "cannot have array type")) {
5110 error_emitted
= true;
5112 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
5113 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5115 * Geometry shader input variables get the per-vertex values
5116 * written out by vertex shader output variables of the same
5117 * names. Since a geometry shader operates on a set of
5118 * vertices, each input varying variable (or input block, see
5119 * interface blocks below) needs to be declared as an array.
5121 if (!var
->type
->is_array()) {
5122 _mesa_glsl_error(&loc
, state
,
5123 "geometry shader inputs must be arrays");
5126 handle_geometry_shader_input_decl(state
, loc
, var
);
5127 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5128 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
5130 * It is a compile-time error to declare a fragment shader
5131 * input with, or that contains, any of the following types:
5135 * * An array of arrays
5136 * * An array of structures
5137 * * A structure containing an array
5138 * * A structure containing a structure
5140 if (state
->es_shader
) {
5141 const glsl_type
*check_type
= var
->type
->without_array();
5142 if (check_type
->is_boolean() ||
5143 check_type
->contains_opaque()) {
5144 _mesa_glsl_error(&loc
, state
,
5145 "fragment shader input cannot have type %s",
5148 if (var
->type
->is_array() &&
5149 var
->type
->fields
.array
->is_array()) {
5150 _mesa_glsl_error(&loc
, state
,
5152 "cannot have an array of arrays",
5153 _mesa_shader_stage_to_string(state
->stage
));
5155 if (var
->type
->is_array() &&
5156 var
->type
->fields
.array
->is_record()) {
5157 _mesa_glsl_error(&loc
, state
,
5158 "fragment shader input "
5159 "cannot have an array of structs");
5161 if (var
->type
->is_record()) {
5162 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5163 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5164 var
->type
->fields
.structure
[i
].type
->is_record())
5165 _mesa_glsl_error(&loc
, state
,
5166 "fragement shader input cannot have "
5167 "a struct that contains an "
5172 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5173 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5174 handle_tess_shader_input_decl(state
, loc
, var
);
5176 } else if (var
->data
.mode
== ir_var_shader_out
) {
5177 const glsl_type
*check_type
= var
->type
->without_array();
5179 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5181 * It is a compile-time error to declare a fragment shader output
5182 * that contains any of the following:
5184 * * A Boolean type (bool, bvec2 ...)
5185 * * A double-precision scalar or vector (double, dvec2 ...)
5190 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5191 if (check_type
->is_record() || check_type
->is_matrix())
5192 _mesa_glsl_error(&loc
, state
,
5193 "fragment shader output "
5194 "cannot have struct or matrix type");
5195 switch (check_type
->base_type
) {
5196 case GLSL_TYPE_UINT
:
5198 case GLSL_TYPE_FLOAT
:
5201 _mesa_glsl_error(&loc
, state
,
5202 "fragment shader output cannot have "
5203 "type %s", check_type
->name
);
5207 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5209 * It is a compile-time error to declare a vertex shader output
5210 * with, or that contains, any of the following types:
5214 * * An array of arrays
5215 * * An array of structures
5216 * * A structure containing an array
5217 * * A structure containing a structure
5219 * It is a compile-time error to declare a fragment shader output
5220 * with, or that contains, any of the following types:
5226 * * An array of array
5228 * ES 3.20 updates this to apply to tessellation and geometry shaders
5229 * as well. Because there are per-vertex arrays in the new stages,
5230 * it strikes the "array of..." rules and replaces them with these:
5232 * * For per-vertex-arrayed variables (applies to tessellation
5233 * control, tessellation evaluation and geometry shaders):
5235 * * Per-vertex-arrayed arrays of arrays
5236 * * Per-vertex-arrayed arrays of structures
5238 * * For non-per-vertex-arrayed variables:
5240 * * An array of arrays
5241 * * An array of structures
5243 * which basically says to unwrap the per-vertex aspect and apply
5246 if (state
->es_shader
) {
5247 if (var
->type
->is_array() &&
5248 var
->type
->fields
.array
->is_array()) {
5249 _mesa_glsl_error(&loc
, state
,
5251 "cannot have an array of arrays",
5252 _mesa_shader_stage_to_string(state
->stage
));
5254 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5255 const glsl_type
*type
= var
->type
;
5257 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5258 !var
->data
.patch
&& var
->type
->is_array()) {
5259 type
= var
->type
->fields
.array
;
5262 if (type
->is_array() && type
->fields
.array
->is_record()) {
5263 _mesa_glsl_error(&loc
, state
,
5264 "%s shader output cannot have "
5265 "an array of structs",
5266 _mesa_shader_stage_to_string(state
->stage
));
5268 if (type
->is_record()) {
5269 for (unsigned i
= 0; i
< type
->length
; i
++) {
5270 if (type
->fields
.structure
[i
].type
->is_array() ||
5271 type
->fields
.structure
[i
].type
->is_record())
5272 _mesa_glsl_error(&loc
, state
,
5273 "%s shader output cannot have a "
5274 "struct that contains an "
5276 _mesa_shader_stage_to_string(state
->stage
));
5282 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5283 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5285 } else if (var
->type
->contains_subroutine()) {
5286 /* declare subroutine uniforms as hidden */
5287 var
->data
.how_declared
= ir_var_hidden
;
5290 /* From section 4.3.4 of the GLSL 4.00 spec:
5291 * "Input variables may not be declared using the patch in qualifier
5292 * in tessellation control or geometry shaders."
5294 * From section 4.3.6 of the GLSL 4.00 spec:
5295 * "It is an error to use patch out in a vertex, tessellation
5296 * evaluation, or geometry shader."
5298 * This doesn't explicitly forbid using them in a fragment shader, but
5299 * that's probably just an oversight.
5301 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5302 && this->type
->qualifier
.flags
.q
.patch
5303 && this->type
->qualifier
.flags
.q
.in
) {
5305 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5306 "tessellation evaluation shader");
5309 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5310 && this->type
->qualifier
.flags
.q
.patch
5311 && this->type
->qualifier
.flags
.q
.out
) {
5313 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5314 "tessellation control shader");
5317 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5319 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5320 state
->check_precision_qualifiers_allowed(&loc
);
5323 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5324 !precision_qualifier_allowed(var
->type
)) {
5325 _mesa_glsl_error(&loc
, state
,
5326 "precision qualifiers apply only to floating point"
5327 ", integer and opaque types");
5330 /* From section 4.1.7 of the GLSL 4.40 spec:
5332 * "[Opaque types] can only be declared as function
5333 * parameters or uniform-qualified variables."
5335 * From section 4.1.7 of the ARB_bindless_texture spec:
5337 * "Samplers may be declared as shader inputs and outputs, as uniform
5338 * variables, as temporary variables, and as function parameters."
5340 * From section 4.1.X of the ARB_bindless_texture spec:
5342 * "Images may be declared as shader inputs and outputs, as uniform
5343 * variables, as temporary variables, and as function parameters."
5345 if (!this->type
->qualifier
.flags
.q
.uniform
&&
5346 (var_type
->contains_atomic() ||
5347 (!state
->has_bindless() && var_type
->contains_opaque()))) {
5348 _mesa_glsl_error(&loc
, state
,
5349 "%s variables must be declared uniform",
5350 state
->has_bindless() ? "atomic" : "opaque");
5353 /* Process the initializer and add its instructions to a temporary
5354 * list. This list will be added to the instruction stream (below) after
5355 * the declaration is added. This is done because in some cases (such as
5356 * redeclarations) the declaration may not actually be added to the
5357 * instruction stream.
5359 exec_list initializer_instructions
;
5361 /* Examine var name here since var may get deleted in the next call */
5362 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5364 bool is_redeclaration
;
5365 ir_variable
*declared_var
=
5366 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5367 false /* allow_all_redeclarations */,
5369 if (is_redeclaration
) {
5371 declared_var
->data
.how_declared
== ir_var_declared_in_block
) {
5372 _mesa_glsl_error(&loc
, state
,
5373 "`%s' has already been redeclared using "
5374 "gl_PerVertex", declared_var
->name
);
5376 declared_var
->data
.how_declared
= ir_var_declared_normally
;
5379 if (decl
->initializer
!= NULL
) {
5380 result
= process_initializer(declared_var
,
5382 &initializer_instructions
, state
);
5384 validate_array_dimensions(var_type
, state
, &loc
);
5387 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5389 * "It is an error to write to a const variable outside of
5390 * its declaration, so they must be initialized when
5393 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5394 _mesa_glsl_error(& loc
, state
,
5395 "const declaration of `%s' must be initialized",
5399 if (state
->es_shader
) {
5400 const glsl_type
*const t
= declared_var
->type
;
5402 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5404 * The GL_OES_tessellation_shader spec says about inputs:
5406 * "Declaring an array size is optional. If no size is specified,
5407 * it will be taken from the implementation-dependent maximum
5408 * patch size (gl_MaxPatchVertices)."
5410 * and about TCS outputs:
5412 * "If no size is specified, it will be taken from output patch
5413 * size declared in the shader."
5415 * The GL_OES_geometry_shader spec says:
5417 * "All geometry shader input unsized array declarations will be
5418 * sized by an earlier input primitive layout qualifier, when
5419 * present, as per the following table."
5421 const bool implicitly_sized
=
5422 (declared_var
->data
.mode
== ir_var_shader_in
&&
5423 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5424 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5425 (declared_var
->data
.mode
== ir_var_shader_out
&&
5426 state
->stage
== MESA_SHADER_TESS_CTRL
);
5428 if (t
->is_unsized_array() && !implicitly_sized
)
5429 /* Section 10.17 of the GLSL ES 1.00 specification states that
5430 * unsized array declarations have been removed from the language.
5431 * Arrays that are sized using an initializer are still explicitly
5432 * sized. However, GLSL ES 1.00 does not allow array
5433 * initializers. That is only allowed in GLSL ES 3.00.
5435 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5437 * "An array type can also be formed without specifying a size
5438 * if the definition includes an initializer:
5440 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5441 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5446 _mesa_glsl_error(& loc
, state
,
5447 "unsized array declarations are not allowed in "
5451 /* If the declaration is not a redeclaration, there are a few additional
5452 * semantic checks that must be applied. In addition, variable that was
5453 * created for the declaration should be added to the IR stream.
5455 if (!is_redeclaration
) {
5456 validate_identifier(decl
->identifier
, loc
, state
);
5458 /* Add the variable to the symbol table. Note that the initializer's
5459 * IR was already processed earlier (though it hasn't been emitted
5460 * yet), without the variable in scope.
5462 * This differs from most C-like languages, but it follows the GLSL
5463 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5466 * "Within a declaration, the scope of a name starts immediately
5467 * after the initializer if present or immediately after the name
5468 * being declared if not."
5470 if (!state
->symbols
->add_variable(declared_var
)) {
5471 YYLTYPE loc
= this->get_location();
5472 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5473 "current scope", decl
->identifier
);
5477 /* Push the variable declaration to the top. It means that all the
5478 * variable declarations will appear in a funny last-to-first order,
5479 * but otherwise we run into trouble if a function is prototyped, a
5480 * global var is decled, then the function is defined with usage of
5481 * the global var. See glslparsertest's CorrectModule.frag.
5483 instructions
->push_head(declared_var
);
5486 instructions
->append_list(&initializer_instructions
);
5490 /* Generally, variable declarations do not have r-values. However,
5491 * one is used for the declaration in
5493 * while (bool b = some_condition()) {
5497 * so we return the rvalue from the last seen declaration here.
5504 ast_parameter_declarator::hir(exec_list
*instructions
,
5505 struct _mesa_glsl_parse_state
*state
)
5508 const struct glsl_type
*type
;
5509 const char *name
= NULL
;
5510 YYLTYPE loc
= this->get_location();
5512 type
= this->type
->glsl_type(& name
, state
);
5516 _mesa_glsl_error(& loc
, state
,
5517 "invalid type `%s' in declaration of `%s'",
5518 name
, this->identifier
);
5520 _mesa_glsl_error(& loc
, state
,
5521 "invalid type in declaration of `%s'",
5525 type
= glsl_type::error_type
;
5528 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5530 * "Functions that accept no input arguments need not use void in the
5531 * argument list because prototypes (or definitions) are required and
5532 * therefore there is no ambiguity when an empty argument list "( )" is
5533 * declared. The idiom "(void)" as a parameter list is provided for
5536 * Placing this check here prevents a void parameter being set up
5537 * for a function, which avoids tripping up checks for main taking
5538 * parameters and lookups of an unnamed symbol.
5540 if (type
->is_void()) {
5541 if (this->identifier
!= NULL
)
5542 _mesa_glsl_error(& loc
, state
,
5543 "named parameter cannot have type `void'");
5549 if (formal_parameter
&& (this->identifier
== NULL
)) {
5550 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5554 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5555 * call already handled the "vec4[..] foo" case.
5557 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5559 if (!type
->is_error() && type
->is_unsized_array()) {
5560 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5562 type
= glsl_type::error_type
;
5566 ir_variable
*var
= new(ctx
)
5567 ir_variable(type
, this->identifier
, ir_var_function_in
);
5569 /* Apply any specified qualifiers to the parameter declaration. Note that
5570 * for function parameters the default mode is 'in'.
5572 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5575 /* From section 4.1.7 of the GLSL 4.40 spec:
5577 * "Opaque variables cannot be treated as l-values; hence cannot
5578 * be used as out or inout function parameters, nor can they be
5581 * From section 4.1.7 of the ARB_bindless_texture spec:
5583 * "Samplers can be used as l-values, so can be assigned into and used
5584 * as "out" and "inout" function parameters."
5586 * From section 4.1.X of the ARB_bindless_texture spec:
5588 * "Images can be used as l-values, so can be assigned into and used as
5589 * "out" and "inout" function parameters."
5591 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5592 && (type
->contains_atomic() ||
5593 (!state
->has_bindless() && type
->contains_opaque()))) {
5594 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5595 "contain %s variables",
5596 state
->has_bindless() ? "atomic" : "opaque");
5597 type
= glsl_type::error_type
;
5600 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5602 * "When calling a function, expressions that do not evaluate to
5603 * l-values cannot be passed to parameters declared as out or inout."
5605 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5607 * "Other binary or unary expressions, non-dereferenced arrays,
5608 * function names, swizzles with repeated fields, and constants
5609 * cannot be l-values."
5611 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5612 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5614 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5616 && !state
->check_version(120, 100, &loc
,
5617 "arrays cannot be out or inout parameters")) {
5618 type
= glsl_type::error_type
;
5621 instructions
->push_tail(var
);
5623 /* Parameter declarations do not have r-values.
5630 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5632 exec_list
*ir_parameters
,
5633 _mesa_glsl_parse_state
*state
)
5635 ast_parameter_declarator
*void_param
= NULL
;
5638 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5639 param
->formal_parameter
= formal
;
5640 param
->hir(ir_parameters
, state
);
5648 if ((void_param
!= NULL
) && (count
> 1)) {
5649 YYLTYPE loc
= void_param
->get_location();
5651 _mesa_glsl_error(& loc
, state
,
5652 "`void' parameter must be only parameter");
5658 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5660 /* IR invariants disallow function declarations or definitions
5661 * nested within other function definitions. But there is no
5662 * requirement about the relative order of function declarations
5663 * and definitions with respect to one another. So simply insert
5664 * the new ir_function block at the end of the toplevel instruction
5667 state
->toplevel_ir
->push_tail(f
);
5672 ast_function::hir(exec_list
*instructions
,
5673 struct _mesa_glsl_parse_state
*state
)
5676 ir_function
*f
= NULL
;
5677 ir_function_signature
*sig
= NULL
;
5678 exec_list hir_parameters
;
5679 YYLTYPE loc
= this->get_location();
5681 const char *const name
= identifier
;
5683 /* New functions are always added to the top-level IR instruction stream,
5684 * so this instruction list pointer is ignored. See also emit_function
5687 (void) instructions
;
5689 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5691 * "Function declarations (prototypes) cannot occur inside of functions;
5692 * they must be at global scope, or for the built-in functions, outside
5693 * the global scope."
5695 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5697 * "User defined functions may only be defined within the global scope."
5699 * Note that this language does not appear in GLSL 1.10.
5701 if ((state
->current_function
!= NULL
) &&
5702 state
->is_version(120, 100)) {
5703 YYLTYPE loc
= this->get_location();
5704 _mesa_glsl_error(&loc
, state
,
5705 "declaration of function `%s' not allowed within "
5706 "function body", name
);
5709 validate_identifier(name
, this->get_location(), state
);
5711 /* Convert the list of function parameters to HIR now so that they can be
5712 * used below to compare this function's signature with previously seen
5713 * signatures for functions with the same name.
5715 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5717 & hir_parameters
, state
);
5719 const char *return_type_name
;
5720 const glsl_type
*return_type
=
5721 this->return_type
->glsl_type(& return_type_name
, state
);
5724 YYLTYPE loc
= this->get_location();
5725 _mesa_glsl_error(&loc
, state
,
5726 "function `%s' has undeclared return type `%s'",
5727 name
, return_type_name
);
5728 return_type
= glsl_type::error_type
;
5731 /* ARB_shader_subroutine states:
5732 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5733 * subroutine(...) to a function declaration."
5735 if (this->return_type
->qualifier
.subroutine_list
&& !is_definition
) {
5736 YYLTYPE loc
= this->get_location();
5737 _mesa_glsl_error(&loc
, state
,
5738 "function declaration `%s' cannot have subroutine prepended",
5742 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5743 * "No qualifier is allowed on the return type of a function."
5745 if (this->return_type
->has_qualifiers(state
)) {
5746 YYLTYPE loc
= this->get_location();
5747 _mesa_glsl_error(& loc
, state
,
5748 "function `%s' return type has qualifiers", name
);
5751 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5753 * "Arrays are allowed as arguments and as the return type. In both
5754 * cases, the array must be explicitly sized."
5756 if (return_type
->is_unsized_array()) {
5757 YYLTYPE loc
= this->get_location();
5758 _mesa_glsl_error(& loc
, state
,
5759 "function `%s' return type array must be explicitly "
5763 /* From section 4.1.7 of the GLSL 4.40 spec:
5765 * "[Opaque types] can only be declared as function parameters
5766 * or uniform-qualified variables."
5768 * The ARB_bindless_texture spec doesn't clearly state this, but as it says
5769 * "Replace Section 4.1.7 (Samplers), p. 25" and, "Replace Section 4.1.X,
5770 * (Images)", this should be allowed.
5772 if (return_type
->contains_atomic() ||
5773 (!state
->has_bindless() && return_type
->contains_opaque())) {
5774 YYLTYPE loc
= this->get_location();
5775 _mesa_glsl_error(&loc
, state
,
5776 "function `%s' return type can't contain an %s type",
5777 name
, state
->has_bindless() ? "atomic" : "opaque");
5781 if (return_type
->is_subroutine()) {
5782 YYLTYPE loc
= this->get_location();
5783 _mesa_glsl_error(&loc
, state
,
5784 "function `%s' return type can't be a subroutine type",
5789 /* Create an ir_function if one doesn't already exist. */
5790 f
= state
->symbols
->get_function(name
);
5792 f
= new(ctx
) ir_function(name
);
5793 if (!this->return_type
->qualifier
.is_subroutine_decl()) {
5794 if (!state
->symbols
->add_function(f
)) {
5795 /* This function name shadows a non-function use of the same name. */
5796 YYLTYPE loc
= this->get_location();
5797 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5798 "non-function", name
);
5802 emit_function(state
, f
);
5805 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5807 * "A shader cannot redefine or overload built-in functions."
5809 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5811 * "User code can overload the built-in functions but cannot redefine
5814 if (state
->es_shader
&& state
->language_version
>= 300) {
5815 /* Local shader has no exact candidates; check the built-ins. */
5816 _mesa_glsl_initialize_builtin_functions();
5817 if (_mesa_glsl_has_builtin_function(name
)) {
5818 YYLTYPE loc
= this->get_location();
5819 _mesa_glsl_error(& loc
, state
,
5820 "A shader cannot redefine or overload built-in "
5821 "function `%s' in GLSL ES 3.00", name
);
5826 /* Verify that this function's signature either doesn't match a previously
5827 * seen signature for a function with the same name, or, if a match is found,
5828 * that the previously seen signature does not have an associated definition.
5830 if (state
->es_shader
|| f
->has_user_signature()) {
5831 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5833 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5834 if (badvar
!= NULL
) {
5835 YYLTYPE loc
= this->get_location();
5837 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5838 "qualifiers don't match prototype", name
, badvar
);
5841 if (sig
->return_type
!= return_type
) {
5842 YYLTYPE loc
= this->get_location();
5844 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5845 "match prototype", name
);
5848 if (sig
->is_defined
) {
5849 if (is_definition
) {
5850 YYLTYPE loc
= this->get_location();
5851 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5853 /* We just encountered a prototype that exactly matches a
5854 * function that's already been defined. This is redundant,
5855 * and we should ignore it.
5863 /* Verify the return type of main() */
5864 if (strcmp(name
, "main") == 0) {
5865 if (! return_type
->is_void()) {
5866 YYLTYPE loc
= this->get_location();
5868 _mesa_glsl_error(& loc
, state
, "main() must return void");
5871 if (!hir_parameters
.is_empty()) {
5872 YYLTYPE loc
= this->get_location();
5874 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5878 /* Finish storing the information about this new function in its signature.
5881 sig
= new(ctx
) ir_function_signature(return_type
);
5882 f
->add_signature(sig
);
5885 sig
->replace_parameters(&hir_parameters
);
5888 if (this->return_type
->qualifier
.subroutine_list
) {
5891 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5892 unsigned qual_index
;
5893 if (process_qualifier_constant(state
, &loc
, "index",
5894 this->return_type
->qualifier
.index
,
5896 if (!state
->has_explicit_uniform_location()) {
5897 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5898 "GL_ARB_explicit_uniform_location or "
5900 } else if (qual_index
>= MAX_SUBROUTINES
) {
5901 _mesa_glsl_error(&loc
, state
,
5902 "invalid subroutine index (%d) index must "
5903 "be a number between 0 and "
5904 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5905 MAX_SUBROUTINES
- 1);
5907 f
->subroutine_index
= qual_index
;
5912 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5913 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5914 f
->num_subroutine_types
);
5916 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5917 const struct glsl_type
*type
;
5918 /* the subroutine type must be already declared */
5919 type
= state
->symbols
->get_type(decl
->identifier
);
5921 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5924 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5925 ir_function
*fn
= state
->subroutine_types
[i
];
5926 ir_function_signature
*tsig
= NULL
;
5928 if (strcmp(fn
->name
, decl
->identifier
))
5931 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5934 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5936 if (tsig
->return_type
!= sig
->return_type
) {
5937 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5941 f
->subroutine_types
[idx
++] = type
;
5943 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5945 state
->num_subroutines
+ 1);
5946 state
->subroutines
[state
->num_subroutines
] = f
;
5947 state
->num_subroutines
++;
5951 if (this->return_type
->qualifier
.is_subroutine_decl()) {
5952 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5953 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5956 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5958 state
->num_subroutine_types
+ 1);
5959 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5960 state
->num_subroutine_types
++;
5962 f
->is_subroutine
= true;
5965 /* Function declarations (prototypes) do not have r-values.
5972 ast_function_definition::hir(exec_list
*instructions
,
5973 struct _mesa_glsl_parse_state
*state
)
5975 prototype
->is_definition
= true;
5976 prototype
->hir(instructions
, state
);
5978 ir_function_signature
*signature
= prototype
->signature
;
5979 if (signature
== NULL
)
5982 assert(state
->current_function
== NULL
);
5983 state
->current_function
= signature
;
5984 state
->found_return
= false;
5986 /* Duplicate parameters declared in the prototype as concrete variables.
5987 * Add these to the symbol table.
5989 state
->symbols
->push_scope();
5990 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5991 assert(var
->as_variable() != NULL
);
5993 /* The only way a parameter would "exist" is if two parameters have
5996 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5997 YYLTYPE loc
= this->get_location();
5999 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
6001 state
->symbols
->add_variable(var
);
6005 /* Convert the body of the function to HIR. */
6006 this->body
->hir(&signature
->body
, state
);
6007 signature
->is_defined
= true;
6009 state
->symbols
->pop_scope();
6011 assert(state
->current_function
== signature
);
6012 state
->current_function
= NULL
;
6014 if (!signature
->return_type
->is_void() && !state
->found_return
) {
6015 YYLTYPE loc
= this->get_location();
6016 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
6017 "%s, but no return statement",
6018 signature
->function_name(),
6019 signature
->return_type
->name
);
6022 /* Function definitions do not have r-values.
6029 ast_jump_statement::hir(exec_list
*instructions
,
6030 struct _mesa_glsl_parse_state
*state
)
6037 assert(state
->current_function
);
6039 if (opt_return_value
) {
6040 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
6042 /* The value of the return type can be NULL if the shader says
6043 * 'return foo();' and foo() is a function that returns void.
6045 * NOTE: The GLSL spec doesn't say that this is an error. The type
6046 * of the return value is void. If the return type of the function is
6047 * also void, then this should compile without error. Seriously.
6049 const glsl_type
*const ret_type
=
6050 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
6052 /* Implicit conversions are not allowed for return values prior to
6053 * ARB_shading_language_420pack.
6055 if (state
->current_function
->return_type
!= ret_type
) {
6056 YYLTYPE loc
= this->get_location();
6058 if (state
->has_420pack()) {
6059 if (!apply_implicit_conversion(state
->current_function
->return_type
,
6061 _mesa_glsl_error(& loc
, state
,
6062 "could not implicitly convert return value "
6063 "to %s, in function `%s'",
6064 state
->current_function
->return_type
->name
,
6065 state
->current_function
->function_name());
6068 _mesa_glsl_error(& loc
, state
,
6069 "`return' with wrong type %s, in function `%s' "
6072 state
->current_function
->function_name(),
6073 state
->current_function
->return_type
->name
);
6075 } else if (state
->current_function
->return_type
->base_type
==
6077 YYLTYPE loc
= this->get_location();
6079 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
6080 * specs add a clarification:
6082 * "A void function can only use return without a return argument, even if
6083 * the return argument has void type. Return statements only accept values:
6086 * void func2() { return func1(); } // illegal return statement"
6088 _mesa_glsl_error(& loc
, state
,
6089 "void functions can only use `return' without a "
6093 inst
= new(ctx
) ir_return(ret
);
6095 if (state
->current_function
->return_type
->base_type
!=
6097 YYLTYPE loc
= this->get_location();
6099 _mesa_glsl_error(& loc
, state
,
6100 "`return' with no value, in function %s returning "
6102 state
->current_function
->function_name());
6104 inst
= new(ctx
) ir_return
;
6107 state
->found_return
= true;
6108 instructions
->push_tail(inst
);
6113 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
6114 YYLTYPE loc
= this->get_location();
6116 _mesa_glsl_error(& loc
, state
,
6117 "`discard' may only appear in a fragment shader");
6119 instructions
->push_tail(new(ctx
) ir_discard
);
6124 if (mode
== ast_continue
&&
6125 state
->loop_nesting_ast
== NULL
) {
6126 YYLTYPE loc
= this->get_location();
6128 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
6129 } else if (mode
== ast_break
&&
6130 state
->loop_nesting_ast
== NULL
&&
6131 state
->switch_state
.switch_nesting_ast
== NULL
) {
6132 YYLTYPE loc
= this->get_location();
6134 _mesa_glsl_error(& loc
, state
,
6135 "break may only appear in a loop or a switch");
6137 /* For a loop, inline the for loop expression again, since we don't
6138 * know where near the end of the loop body the normal copy of it is
6139 * going to be placed. Same goes for the condition for a do-while
6142 if (state
->loop_nesting_ast
!= NULL
&&
6143 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
6144 if (state
->loop_nesting_ast
->rest_expression
) {
6145 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
6148 if (state
->loop_nesting_ast
->mode
==
6149 ast_iteration_statement::ast_do_while
) {
6150 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
6154 if (state
->switch_state
.is_switch_innermost
&&
6155 mode
== ast_continue
) {
6156 /* Set 'continue_inside' to true. */
6157 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
6158 ir_dereference_variable
*deref_continue_inside_var
=
6159 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6160 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6163 /* Break out from the switch, continue for the loop will
6164 * be called right after switch. */
6165 ir_loop_jump
*const jump
=
6166 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6167 instructions
->push_tail(jump
);
6169 } else if (state
->switch_state
.is_switch_innermost
&&
6170 mode
== ast_break
) {
6171 /* Force break out of switch by inserting a break. */
6172 ir_loop_jump
*const jump
=
6173 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6174 instructions
->push_tail(jump
);
6176 ir_loop_jump
*const jump
=
6177 new(ctx
) ir_loop_jump((mode
== ast_break
)
6178 ? ir_loop_jump::jump_break
6179 : ir_loop_jump::jump_continue
);
6180 instructions
->push_tail(jump
);
6187 /* Jump instructions do not have r-values.
6194 ast_selection_statement::hir(exec_list
*instructions
,
6195 struct _mesa_glsl_parse_state
*state
)
6199 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6201 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6203 * "Any expression whose type evaluates to a Boolean can be used as the
6204 * conditional expression bool-expression. Vector types are not accepted
6205 * as the expression to if."
6207 * The checks are separated so that higher quality diagnostics can be
6208 * generated for cases where both rules are violated.
6210 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6211 YYLTYPE loc
= this->condition
->get_location();
6213 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6217 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6219 if (then_statement
!= NULL
) {
6220 state
->symbols
->push_scope();
6221 then_statement
->hir(& stmt
->then_instructions
, state
);
6222 state
->symbols
->pop_scope();
6225 if (else_statement
!= NULL
) {
6226 state
->symbols
->push_scope();
6227 else_statement
->hir(& stmt
->else_instructions
, state
);
6228 state
->symbols
->pop_scope();
6231 instructions
->push_tail(stmt
);
6233 /* if-statements do not have r-values.
6239 /* Used for detection of duplicate case values, compare
6240 * given contents directly.
6243 compare_case_value(const void *a
, const void *b
)
6245 return *(unsigned *) a
== *(unsigned *) b
;
6249 /* Used for detection of duplicate case values, just
6250 * returns key contents as is.
6253 key_contents(const void *key
)
6255 return *(unsigned *) key
;
6260 ast_switch_statement::hir(exec_list
*instructions
,
6261 struct _mesa_glsl_parse_state
*state
)
6265 ir_rvalue
*const test_expression
=
6266 this->test_expression
->hir(instructions
, state
);
6268 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6270 * "The type of init-expression in a switch statement must be a
6273 if (!test_expression
->type
->is_scalar() ||
6274 !test_expression
->type
->is_integer()) {
6275 YYLTYPE loc
= this->test_expression
->get_location();
6277 _mesa_glsl_error(& loc
,
6279 "switch-statement expression must be scalar "
6283 /* Track the switch-statement nesting in a stack-like manner.
6285 struct glsl_switch_state saved
= state
->switch_state
;
6287 state
->switch_state
.is_switch_innermost
= true;
6288 state
->switch_state
.switch_nesting_ast
= this;
6289 state
->switch_state
.labels_ht
=
6290 _mesa_hash_table_create(NULL
, key_contents
,
6291 compare_case_value
);
6292 state
->switch_state
.previous_default
= NULL
;
6294 /* Initalize is_fallthru state to false.
6296 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6297 state
->switch_state
.is_fallthru_var
=
6298 new(ctx
) ir_variable(glsl_type::bool_type
,
6299 "switch_is_fallthru_tmp",
6301 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6303 ir_dereference_variable
*deref_is_fallthru_var
=
6304 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6305 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6308 /* Initialize continue_inside state to false.
6310 state
->switch_state
.continue_inside
=
6311 new(ctx
) ir_variable(glsl_type::bool_type
,
6312 "continue_inside_tmp",
6314 instructions
->push_tail(state
->switch_state
.continue_inside
);
6316 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6317 ir_dereference_variable
*deref_continue_inside_var
=
6318 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6319 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6322 state
->switch_state
.run_default
=
6323 new(ctx
) ir_variable(glsl_type::bool_type
,
6326 instructions
->push_tail(state
->switch_state
.run_default
);
6328 /* Loop around the switch is used for flow control. */
6329 ir_loop
* loop
= new(ctx
) ir_loop();
6330 instructions
->push_tail(loop
);
6332 /* Cache test expression.
6334 test_to_hir(&loop
->body_instructions
, state
);
6336 /* Emit code for body of switch stmt.
6338 body
->hir(&loop
->body_instructions
, state
);
6340 /* Insert a break at the end to exit loop. */
6341 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6342 loop
->body_instructions
.push_tail(jump
);
6344 /* If we are inside loop, check if continue got called inside switch. */
6345 if (state
->loop_nesting_ast
!= NULL
) {
6346 ir_dereference_variable
*deref_continue_inside
=
6347 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6348 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6349 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6351 if (state
->loop_nesting_ast
!= NULL
) {
6352 if (state
->loop_nesting_ast
->rest_expression
) {
6353 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6356 if (state
->loop_nesting_ast
->mode
==
6357 ast_iteration_statement::ast_do_while
) {
6358 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6361 irif
->then_instructions
.push_tail(jump
);
6362 instructions
->push_tail(irif
);
6365 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6367 state
->switch_state
= saved
;
6369 /* Switch statements do not have r-values. */
6375 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6376 struct _mesa_glsl_parse_state
*state
)
6380 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6381 * on the switch test case. The first one would be already raised when
6382 * getting the test_expression at ast_switch_statement::hir
6384 test_expression
->set_is_lhs(true);
6385 /* Cache value of test expression. */
6386 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6388 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6391 ir_dereference_variable
*deref_test_var
=
6392 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6394 instructions
->push_tail(state
->switch_state
.test_var
);
6395 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6400 ast_switch_body::hir(exec_list
*instructions
,
6401 struct _mesa_glsl_parse_state
*state
)
6404 stmts
->hir(instructions
, state
);
6406 /* Switch bodies do not have r-values. */
6411 ast_case_statement_list::hir(exec_list
*instructions
,
6412 struct _mesa_glsl_parse_state
*state
)
6414 exec_list default_case
, after_default
, tmp
;
6416 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6417 case_stmt
->hir(&tmp
, state
);
6420 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6421 default_case
.append_list(&tmp
);
6425 /* If default case found, append 'after_default' list. */
6426 if (!default_case
.is_empty())
6427 after_default
.append_list(&tmp
);
6429 instructions
->append_list(&tmp
);
6432 /* Handle the default case. This is done here because default might not be
6433 * the last case. We need to add checks against following cases first to see
6434 * if default should be chosen or not.
6436 if (!default_case
.is_empty()) {
6438 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6439 ir_dereference_variable
*deref_run_default_var
=
6440 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6442 /* Choose to run default case initially, following conditional
6443 * assignments might change this.
6445 ir_assignment
*const init_var
=
6446 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6447 instructions
->push_tail(init_var
);
6449 /* Default case was the last one, no checks required. */
6450 if (after_default
.is_empty()) {
6451 instructions
->append_list(&default_case
);
6455 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6456 ir_assignment
*assign
= ir
->as_assignment();
6461 /* Clone the check between case label and init expression. */
6462 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6463 ir_expression
*clone
= exp
->clone(state
, NULL
);
6465 ir_dereference_variable
*deref_var
=
6466 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6467 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6469 ir_assignment
*const set_false
=
6470 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6472 instructions
->push_tail(set_false
);
6475 /* Append default case and all cases after it. */
6476 instructions
->append_list(&default_case
);
6477 instructions
->append_list(&after_default
);
6480 /* Case statements do not have r-values. */
6485 ast_case_statement::hir(exec_list
*instructions
,
6486 struct _mesa_glsl_parse_state
*state
)
6488 labels
->hir(instructions
, state
);
6490 /* Guard case statements depending on fallthru state. */
6491 ir_dereference_variable
*const deref_fallthru_guard
=
6492 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6493 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6495 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6496 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6498 instructions
->push_tail(test_fallthru
);
6500 /* Case statements do not have r-values. */
6506 ast_case_label_list::hir(exec_list
*instructions
,
6507 struct _mesa_glsl_parse_state
*state
)
6509 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6510 label
->hir(instructions
, state
);
6512 /* Case labels do not have r-values. */
6517 ast_case_label::hir(exec_list
*instructions
,
6518 struct _mesa_glsl_parse_state
*state
)
6522 ir_dereference_variable
*deref_fallthru_var
=
6523 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6525 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6527 /* If not default case, ... */
6528 if (this->test_value
!= NULL
) {
6529 /* Conditionally set fallthru state based on
6530 * comparison of cached test expression value to case label.
6532 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6533 ir_constant
*label_const
= label_rval
->constant_expression_value();
6536 YYLTYPE loc
= this->test_value
->get_location();
6538 _mesa_glsl_error(& loc
, state
,
6539 "switch statement case label must be a "
6540 "constant expression");
6542 /* Stuff a dummy value in to allow processing to continue. */
6543 label_const
= new(ctx
) ir_constant(0);
6546 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6547 (void *)(uintptr_t)&label_const
->value
.u
[0]);
6550 ast_expression
*previous_label
= (ast_expression
*) entry
->data
;
6551 YYLTYPE loc
= this->test_value
->get_location();
6552 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6554 loc
= previous_label
->get_location();
6555 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6557 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6558 (void *)(uintptr_t)&label_const
->value
.u
[0],
6563 ir_dereference_variable
*deref_test_var
=
6564 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6566 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6571 * From GLSL 4.40 specification section 6.2 ("Selection"):
6573 * "The type of the init-expression value in a switch statement must
6574 * be a scalar int or uint. The type of the constant-expression value
6575 * in a case label also must be a scalar int or uint. When any pair
6576 * of these values is tested for "equal value" and the types do not
6577 * match, an implicit conversion will be done to convert the int to a
6578 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6581 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6582 YYLTYPE loc
= this->test_value
->get_location();
6584 const glsl_type
*type_a
= label_const
->type
;
6585 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6587 /* Check if int->uint implicit conversion is supported. */
6588 bool integer_conversion_supported
=
6589 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6592 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6593 !integer_conversion_supported
) {
6594 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6595 "init-expression and case label (%s != %s)",
6596 type_a
->name
, type_b
->name
);
6598 /* Conversion of the case label. */
6599 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6600 if (!apply_implicit_conversion(glsl_type::uint_type
,
6601 test_cond
->operands
[0], state
))
6602 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6604 /* Conversion of the init-expression value. */
6605 if (!apply_implicit_conversion(glsl_type::uint_type
,
6606 test_cond
->operands
[1], state
))
6607 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6612 ir_assignment
*set_fallthru_on_test
=
6613 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6615 instructions
->push_tail(set_fallthru_on_test
);
6616 } else { /* default case */
6617 if (state
->switch_state
.previous_default
) {
6618 YYLTYPE loc
= this->get_location();
6619 _mesa_glsl_error(& loc
, state
,
6620 "multiple default labels in one switch");
6622 loc
= state
->switch_state
.previous_default
->get_location();
6623 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6625 state
->switch_state
.previous_default
= this;
6627 /* Set fallthru condition on 'run_default' bool. */
6628 ir_dereference_variable
*deref_run_default
=
6629 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6630 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6631 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6635 /* Set falltrhu state. */
6636 ir_assignment
*set_fallthru
=
6637 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6639 instructions
->push_tail(set_fallthru
);
6642 /* Case statements do not have r-values. */
6647 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6648 struct _mesa_glsl_parse_state
*state
)
6652 if (condition
!= NULL
) {
6653 ir_rvalue
*const cond
=
6654 condition
->hir(instructions
, state
);
6657 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6658 YYLTYPE loc
= condition
->get_location();
6660 _mesa_glsl_error(& loc
, state
,
6661 "loop condition must be scalar boolean");
6663 /* As the first code in the loop body, generate a block that looks
6664 * like 'if (!condition) break;' as the loop termination condition.
6666 ir_rvalue
*const not_cond
=
6667 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6669 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6671 ir_jump
*const break_stmt
=
6672 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6674 if_stmt
->then_instructions
.push_tail(break_stmt
);
6675 instructions
->push_tail(if_stmt
);
6682 ast_iteration_statement::hir(exec_list
*instructions
,
6683 struct _mesa_glsl_parse_state
*state
)
6687 /* For-loops and while-loops start a new scope, but do-while loops do not.
6689 if (mode
!= ast_do_while
)
6690 state
->symbols
->push_scope();
6692 if (init_statement
!= NULL
)
6693 init_statement
->hir(instructions
, state
);
6695 ir_loop
*const stmt
= new(ctx
) ir_loop();
6696 instructions
->push_tail(stmt
);
6698 /* Track the current loop nesting. */
6699 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6701 state
->loop_nesting_ast
= this;
6703 /* Likewise, indicate that following code is closest to a loop,
6704 * NOT closest to a switch.
6706 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6707 state
->switch_state
.is_switch_innermost
= false;
6709 if (mode
!= ast_do_while
)
6710 condition_to_hir(&stmt
->body_instructions
, state
);
6713 body
->hir(& stmt
->body_instructions
, state
);
6715 if (rest_expression
!= NULL
)
6716 rest_expression
->hir(& stmt
->body_instructions
, state
);
6718 if (mode
== ast_do_while
)
6719 condition_to_hir(&stmt
->body_instructions
, state
);
6721 if (mode
!= ast_do_while
)
6722 state
->symbols
->pop_scope();
6724 /* Restore previous nesting before returning. */
6725 state
->loop_nesting_ast
= nesting_ast
;
6726 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6728 /* Loops do not have r-values.
6735 * Determine if the given type is valid for establishing a default precision
6738 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6740 * "The precision statement
6742 * precision precision-qualifier type;
6744 * can be used to establish a default precision qualifier. The type field
6745 * can be either int or float or any of the sampler types, and the
6746 * precision-qualifier can be lowp, mediump, or highp."
6748 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6749 * qualifiers on sampler types, but this seems like an oversight (since the
6750 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6751 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6755 is_valid_default_precision_type(const struct glsl_type
*const type
)
6760 switch (type
->base_type
) {
6762 case GLSL_TYPE_FLOAT
:
6763 /* "int" and "float" are valid, but vectors and matrices are not. */
6764 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6765 case GLSL_TYPE_SAMPLER
:
6766 case GLSL_TYPE_IMAGE
:
6767 case GLSL_TYPE_ATOMIC_UINT
:
6776 ast_type_specifier::hir(exec_list
*instructions
,
6777 struct _mesa_glsl_parse_state
*state
)
6779 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6782 YYLTYPE loc
= this->get_location();
6784 /* If this is a precision statement, check that the type to which it is
6785 * applied is either float or int.
6787 * From section 4.5.3 of the GLSL 1.30 spec:
6788 * "The precision statement
6789 * precision precision-qualifier type;
6790 * can be used to establish a default precision qualifier. The type
6791 * field can be either int or float [...]. Any other types or
6792 * qualifiers will result in an error.
6794 if (this->default_precision
!= ast_precision_none
) {
6795 if (!state
->check_precision_qualifiers_allowed(&loc
))
6798 if (this->structure
!= NULL
) {
6799 _mesa_glsl_error(&loc
, state
,
6800 "precision qualifiers do not apply to structures");
6804 if (this->array_specifier
!= NULL
) {
6805 _mesa_glsl_error(&loc
, state
,
6806 "default precision statements do not apply to "
6811 const struct glsl_type
*const type
=
6812 state
->symbols
->get_type(this->type_name
);
6813 if (!is_valid_default_precision_type(type
)) {
6814 _mesa_glsl_error(&loc
, state
,
6815 "default precision statements apply only to "
6816 "float, int, and opaque types");
6820 if (state
->es_shader
) {
6821 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6824 * "Non-precision qualified declarations will use the precision
6825 * qualifier specified in the most recent precision statement
6826 * that is still in scope. The precision statement has the same
6827 * scoping rules as variable declarations. If it is declared
6828 * inside a compound statement, its effect stops at the end of
6829 * the innermost statement it was declared in. Precision
6830 * statements in nested scopes override precision statements in
6831 * outer scopes. Multiple precision statements for the same basic
6832 * type can appear inside the same scope, with later statements
6833 * overriding earlier statements within that scope."
6835 * Default precision specifications follow the same scope rules as
6836 * variables. So, we can track the state of the default precision
6837 * qualifiers in the symbol table, and the rules will just work. This
6838 * is a slight abuse of the symbol table, but it has the semantics
6841 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6842 this->default_precision
);
6845 /* FINISHME: Translate precision statements into IR. */
6849 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6850 * process_record_constructor() can do type-checking on C-style initializer
6851 * expressions of structs, but ast_struct_specifier should only be translated
6852 * to HIR if it is declaring the type of a structure.
6854 * The ->is_declaration field is false for initializers of variables
6855 * declared separately from the struct's type definition.
6857 * struct S { ... }; (is_declaration = true)
6858 * struct T { ... } t = { ... }; (is_declaration = true)
6859 * S s = { ... }; (is_declaration = false)
6861 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6862 return this->structure
->hir(instructions
, state
);
6869 * Process a structure or interface block tree into an array of structure fields
6871 * After parsing, where there are some syntax differnces, structures and
6872 * interface blocks are almost identical. They are similar enough that the
6873 * AST for each can be processed the same way into a set of
6874 * \c glsl_struct_field to describe the members.
6876 * If we're processing an interface block, var_mode should be the type of the
6877 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6878 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6882 * The number of fields processed. A pointer to the array structure fields is
6883 * stored in \c *fields_ret.
6886 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6887 struct _mesa_glsl_parse_state
*state
,
6888 exec_list
*declarations
,
6889 glsl_struct_field
**fields_ret
,
6891 enum glsl_matrix_layout matrix_layout
,
6892 bool allow_reserved_names
,
6893 ir_variable_mode var_mode
,
6894 ast_type_qualifier
*layout
,
6895 unsigned block_stream
,
6896 unsigned block_xfb_buffer
,
6897 unsigned block_xfb_offset
,
6898 unsigned expl_location
,
6899 unsigned expl_align
)
6901 unsigned decl_count
= 0;
6902 unsigned next_offset
= 0;
6904 /* Make an initial pass over the list of fields to determine how
6905 * many there are. Each element in this list is an ast_declarator_list.
6906 * This means that we actually need to count the number of elements in the
6907 * 'declarations' list in each of the elements.
6909 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6910 decl_count
+= decl_list
->declarations
.length();
6913 /* Allocate storage for the fields and process the field
6914 * declarations. As the declarations are processed, try to also convert
6915 * the types to HIR. This ensures that structure definitions embedded in
6916 * other structure definitions or in interface blocks are processed.
6918 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
6921 bool first_member
= true;
6922 bool first_member_has_explicit_location
= false;
6925 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6926 const char *type_name
;
6927 YYLTYPE loc
= decl_list
->get_location();
6929 decl_list
->type
->specifier
->hir(instructions
, state
);
6931 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6933 * "Anonymous structures are not supported; so embedded structures
6934 * must have a declarator. A name given to an embedded struct is
6935 * scoped at the same level as the struct it is embedded in."
6937 * The same section of the GLSL 1.20 spec says:
6939 * "Anonymous structures are not supported. Embedded structures are
6942 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6943 * embedded structures in 1.10 only.
6945 if (state
->language_version
!= 110 &&
6946 decl_list
->type
->specifier
->structure
!= NULL
)
6947 _mesa_glsl_error(&loc
, state
,
6948 "embedded structure declarations are not allowed");
6950 const glsl_type
*decl_type
=
6951 decl_list
->type
->glsl_type(& type_name
, state
);
6953 const struct ast_type_qualifier
*const qual
=
6954 &decl_list
->type
->qualifier
;
6956 /* From section 4.3.9 of the GLSL 4.40 spec:
6958 * "[In interface blocks] opaque types are not allowed."
6960 * It should be impossible for decl_type to be NULL here. Cases that
6961 * might naturally lead to decl_type being NULL, especially for the
6962 * is_interface case, will have resulted in compilation having
6963 * already halted due to a syntax error.
6968 /* From section 4.3.7 of the ARB_bindless_texture spec:
6970 * "(remove the following bullet from the last list on p. 39,
6971 * thereby permitting sampler types in interface blocks; image
6972 * types are also permitted in blocks by this extension)"
6974 * * sampler types are not allowed
6976 if (decl_type
->contains_atomic() ||
6977 (!state
->has_bindless() && decl_type
->contains_opaque())) {
6978 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6979 "interface block contains %s variable",
6980 state
->has_bindless() ? "atomic" : "opaque");
6983 if (decl_type
->contains_atomic()) {
6984 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6986 * "Members of structures cannot be declared as atomic counter
6989 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6992 if (decl_type
->contains_image()) {
6993 /* FINISHME: Same problem as with atomic counters.
6994 * FINISHME: Request clarification from Khronos and add
6995 * FINISHME: spec quotation here.
6997 _mesa_glsl_error(&loc
, state
, "image in structure");
7001 if (qual
->flags
.q
.explicit_binding
) {
7002 _mesa_glsl_error(&loc
, state
,
7003 "binding layout qualifier cannot be applied "
7004 "to struct or interface block members");
7008 if (!first_member
) {
7009 if (!layout
->flags
.q
.explicit_location
&&
7010 ((first_member_has_explicit_location
&&
7011 !qual
->flags
.q
.explicit_location
) ||
7012 (!first_member_has_explicit_location
&&
7013 qual
->flags
.q
.explicit_location
))) {
7014 _mesa_glsl_error(&loc
, state
,
7015 "when block-level location layout qualifier "
7016 "is not supplied either all members must "
7017 "have a location layout qualifier or all "
7018 "members must not have a location layout "
7022 first_member
= false;
7023 first_member_has_explicit_location
=
7024 qual
->flags
.q
.explicit_location
;
7028 if (qual
->flags
.q
.std140
||
7029 qual
->flags
.q
.std430
||
7030 qual
->flags
.q
.packed
||
7031 qual
->flags
.q
.shared
) {
7032 _mesa_glsl_error(&loc
, state
,
7033 "uniform/shader storage block layout qualifiers "
7034 "std140, std430, packed, and shared can only be "
7035 "applied to uniform/shader storage blocks, not "
7039 if (qual
->flags
.q
.constant
) {
7040 _mesa_glsl_error(&loc
, state
,
7041 "const storage qualifier cannot be applied "
7042 "to struct or interface block members");
7045 validate_memory_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7046 validate_image_format_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7048 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
7050 * "A block member may be declared with a stream identifier, but
7051 * the specified stream must match the stream associated with the
7052 * containing block."
7054 if (qual
->flags
.q
.explicit_stream
) {
7055 unsigned qual_stream
;
7056 if (process_qualifier_constant(state
, &loc
, "stream",
7057 qual
->stream
, &qual_stream
) &&
7058 qual_stream
!= block_stream
) {
7059 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
7060 "interface block member does not match "
7061 "the interface block (%u vs %u)", qual_stream
,
7067 unsigned explicit_xfb_buffer
= 0;
7068 if (qual
->flags
.q
.explicit_xfb_buffer
) {
7069 unsigned qual_xfb_buffer
;
7070 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
7071 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
7072 explicit_xfb_buffer
= 1;
7073 if (qual_xfb_buffer
!= block_xfb_buffer
)
7074 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
7075 "interface block member does not match "
7076 "the interface block (%u vs %u)",
7077 qual_xfb_buffer
, block_xfb_buffer
);
7079 xfb_buffer
= (int) qual_xfb_buffer
;
7082 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
7083 xfb_buffer
= (int) block_xfb_buffer
;
7086 int xfb_stride
= -1;
7087 if (qual
->flags
.q
.explicit_xfb_stride
) {
7088 unsigned qual_xfb_stride
;
7089 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
7090 qual
->xfb_stride
, &qual_xfb_stride
)) {
7091 xfb_stride
= (int) qual_xfb_stride
;
7095 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
7096 _mesa_glsl_error(&loc
, state
,
7097 "interpolation qualifiers cannot be used "
7098 "with uniform interface blocks");
7101 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
7102 qual
->has_auxiliary_storage()) {
7103 _mesa_glsl_error(&loc
, state
,
7104 "auxiliary storage qualifiers cannot be used "
7105 "in uniform blocks or structures.");
7108 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
7109 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
7110 _mesa_glsl_error(&loc
, state
,
7111 "row_major and column_major can only be "
7112 "applied to interface blocks");
7114 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
7117 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
7118 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
7119 "readonly and writeonly.");
7122 foreach_list_typed (ast_declaration
, decl
, link
,
7123 &decl_list
->declarations
) {
7124 YYLTYPE loc
= decl
->get_location();
7126 if (!allow_reserved_names
)
7127 validate_identifier(decl
->identifier
, loc
, state
);
7129 const struct glsl_type
*field_type
=
7130 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
7131 validate_array_dimensions(field_type
, state
, &loc
);
7132 fields
[i
].type
= field_type
;
7133 fields
[i
].name
= decl
->identifier
;
7134 fields
[i
].interpolation
=
7135 interpret_interpolation_qualifier(qual
, field_type
,
7136 var_mode
, state
, &loc
);
7137 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
7138 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
7139 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
7140 fields
[i
].precision
= qual
->precision
;
7141 fields
[i
].offset
= -1;
7142 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
7143 fields
[i
].xfb_buffer
= xfb_buffer
;
7144 fields
[i
].xfb_stride
= xfb_stride
;
7146 if (qual
->flags
.q
.explicit_location
) {
7147 unsigned qual_location
;
7148 if (process_qualifier_constant(state
, &loc
, "location",
7149 qual
->location
, &qual_location
)) {
7150 fields
[i
].location
= qual_location
+
7151 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
7152 expl_location
= fields
[i
].location
+
7153 fields
[i
].type
->count_attribute_slots(false);
7156 if (layout
&& layout
->flags
.q
.explicit_location
) {
7157 fields
[i
].location
= expl_location
;
7158 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
7160 fields
[i
].location
= -1;
7164 /* Offset can only be used with std430 and std140 layouts an initial
7165 * value of 0 is used for error detection.
7171 if (qual
->flags
.q
.row_major
||
7172 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
7178 if(layout
->flags
.q
.std140
) {
7179 align
= field_type
->std140_base_alignment(row_major
);
7180 size
= field_type
->std140_size(row_major
);
7181 } else if (layout
->flags
.q
.std430
) {
7182 align
= field_type
->std430_base_alignment(row_major
);
7183 size
= field_type
->std430_size(row_major
);
7187 if (qual
->flags
.q
.explicit_offset
) {
7188 unsigned qual_offset
;
7189 if (process_qualifier_constant(state
, &loc
, "offset",
7190 qual
->offset
, &qual_offset
)) {
7191 if (align
!= 0 && size
!= 0) {
7192 if (next_offset
> qual_offset
)
7193 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7194 "offset overlaps previous member");
7196 if (qual_offset
% align
) {
7197 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7198 "must be a multiple of the base "
7199 "alignment of %s", field_type
->name
);
7201 fields
[i
].offset
= qual_offset
;
7202 next_offset
= glsl_align(qual_offset
+ size
, align
);
7204 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7205 "with std430 and std140 layouts");
7210 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7211 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7213 if (align
== 0 || size
== 0) {
7214 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7215 "std430 and std140 layouts");
7216 } else if (qual
->flags
.q
.explicit_align
) {
7217 unsigned member_align
;
7218 if (process_qualifier_constant(state
, &loc
, "align",
7219 qual
->align
, &member_align
)) {
7220 if (member_align
== 0 ||
7221 member_align
& (member_align
- 1)) {
7222 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7223 "in not a power of 2");
7225 fields
[i
].offset
= glsl_align(offset
, member_align
);
7226 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7230 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7231 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7233 } else if (!qual
->flags
.q
.explicit_offset
) {
7234 if (align
!= 0 && size
!= 0)
7235 next_offset
= glsl_align(next_offset
+ size
, align
);
7238 /* From the ARB_enhanced_layouts spec:
7240 * "The given offset applies to the first component of the first
7241 * member of the qualified entity. Then, within the qualified
7242 * entity, subsequent components are each assigned, in order, to
7243 * the next available offset aligned to a multiple of that
7244 * component's size. Aggregate types are flattened down to the
7245 * component level to get this sequence of components."
7247 if (qual
->flags
.q
.explicit_xfb_offset
) {
7248 unsigned xfb_offset
;
7249 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7250 qual
->offset
, &xfb_offset
)) {
7251 fields
[i
].offset
= xfb_offset
;
7252 block_xfb_offset
= fields
[i
].offset
+
7253 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
7256 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7257 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7258 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7260 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
7264 /* Propogate row- / column-major information down the fields of the
7265 * structure or interface block. Structures need this data because
7266 * the structure may contain a structure that contains ... a matrix
7267 * that need the proper layout.
7269 if (is_interface
&& layout
&&
7270 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7271 (field_type
->without_array()->is_matrix()
7272 || field_type
->without_array()->is_record())) {
7273 /* If no layout is specified for the field, inherit the layout
7276 fields
[i
].matrix_layout
= matrix_layout
;
7278 if (qual
->flags
.q
.row_major
)
7279 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7280 else if (qual
->flags
.q
.column_major
)
7281 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7283 /* If we're processing an uniform or buffer block, the matrix
7284 * layout must be decided by this point.
7286 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7287 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7290 /* Image qualifiers are allowed on buffer variables, which can only
7291 * be defined inside shader storage buffer objects
7293 if (layout
&& var_mode
== ir_var_shader_storage
) {
7294 /* For readonly and writeonly qualifiers the field definition,
7295 * if set, overwrites the layout qualifier.
7297 if (qual
->flags
.q
.read_only
) {
7298 fields
[i
].memory_read_only
= true;
7299 fields
[i
].memory_write_only
= false;
7300 } else if (qual
->flags
.q
.write_only
) {
7301 fields
[i
].memory_read_only
= false;
7302 fields
[i
].memory_write_only
= true;
7304 fields
[i
].memory_read_only
= layout
->flags
.q
.read_only
;
7305 fields
[i
].memory_write_only
= layout
->flags
.q
.write_only
;
7308 /* For other qualifiers, we set the flag if either the layout
7309 * qualifier or the field qualifier are set
7311 fields
[i
].memory_coherent
= qual
->flags
.q
.coherent
||
7312 layout
->flags
.q
.coherent
;
7313 fields
[i
].memory_volatile
= qual
->flags
.q
._volatile
||
7314 layout
->flags
.q
._volatile
;
7315 fields
[i
].memory_restrict
= qual
->flags
.q
.restrict_flag
||
7316 layout
->flags
.q
.restrict_flag
;
7323 assert(i
== decl_count
);
7325 *fields_ret
= fields
;
7331 ast_struct_specifier::hir(exec_list
*instructions
,
7332 struct _mesa_glsl_parse_state
*state
)
7334 YYLTYPE loc
= this->get_location();
7336 unsigned expl_location
= 0;
7337 if (layout
&& layout
->flags
.q
.explicit_location
) {
7338 if (!process_qualifier_constant(state
, &loc
, "location",
7339 layout
->location
, &expl_location
)) {
7342 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7346 glsl_struct_field
*fields
;
7347 unsigned decl_count
=
7348 ast_process_struct_or_iface_block_members(instructions
,
7350 &this->declarations
,
7353 GLSL_MATRIX_LAYOUT_INHERITED
,
7354 false /* allow_reserved_names */,
7357 0, /* for interface only */
7358 0, /* for interface only */
7359 0, /* for interface only */
7361 0 /* for interface only */);
7363 validate_identifier(this->name
, loc
, state
);
7365 const glsl_type
*t
=
7366 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7368 if (!state
->symbols
->add_type(name
, t
)) {
7369 const glsl_type
*match
= state
->symbols
->get_type(name
);
7370 /* allow struct matching for desktop GL - older UE4 does this */
7371 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
7372 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7374 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7376 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7378 state
->num_user_structures
+ 1);
7380 s
[state
->num_user_structures
] = t
;
7381 state
->user_structures
= s
;
7382 state
->num_user_structures
++;
7386 /* Structure type definitions do not have r-values.
7393 * Visitor class which detects whether a given interface block has been used.
7395 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7398 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7399 : mode(mode
), block(block
), found(false)
7403 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7405 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7409 return visit_continue
;
7412 bool usage_found() const
7418 ir_variable_mode mode
;
7419 const glsl_type
*block
;
7424 is_unsized_array_last_element(ir_variable
*v
)
7426 const glsl_type
*interface_type
= v
->get_interface_type();
7427 int length
= interface_type
->length
;
7429 assert(v
->type
->is_unsized_array());
7431 /* Check if it is the last element of the interface */
7432 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7438 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7440 var
->data
.memory_read_only
= field
.memory_read_only
;
7441 var
->data
.memory_write_only
= field
.memory_write_only
;
7442 var
->data
.memory_coherent
= field
.memory_coherent
;
7443 var
->data
.memory_volatile
= field
.memory_volatile
;
7444 var
->data
.memory_restrict
= field
.memory_restrict
;
7448 ast_interface_block::hir(exec_list
*instructions
,
7449 struct _mesa_glsl_parse_state
*state
)
7451 YYLTYPE loc
= this->get_location();
7453 /* Interface blocks must be declared at global scope */
7454 if (state
->current_function
!= NULL
) {
7455 _mesa_glsl_error(&loc
, state
,
7456 "Interface block `%s' must be declared "
7461 /* Validate qualifiers:
7463 * - Layout Qualifiers as per the table in Section 4.4
7464 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7466 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7469 * "Additionally, memory qualifiers may also be used in the declaration
7470 * of shader storage blocks"
7472 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7473 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7474 * Layout Qualifiers) of the GLSL 4.50 spec says:
7476 * "The std430 qualifier is supported only for shader storage blocks;
7477 * using std430 on a uniform block will result in a compile-time error."
7479 ast_type_qualifier allowed_blk_qualifiers
;
7480 allowed_blk_qualifiers
.flags
.i
= 0;
7481 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7482 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7483 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7484 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7485 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7486 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7487 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7488 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7489 if (this->layout
.flags
.q
.buffer
) {
7490 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7491 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7492 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7493 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7494 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7495 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7496 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7498 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7501 /* Interface block */
7502 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7504 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7505 if (this->layout
.flags
.q
.out
) {
7506 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7507 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7508 state
->stage
== MESA_SHADER_TESS_CTRL
||
7509 state
->stage
== MESA_SHADER_TESS_EVAL
||
7510 state
->stage
== MESA_SHADER_VERTEX
) {
7511 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7512 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7513 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7514 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7515 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7516 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7517 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7518 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7520 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7521 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7525 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7526 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7527 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7532 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7533 "invalid qualifier for block",
7536 /* The ast_interface_block has a list of ast_declarator_lists. We
7537 * need to turn those into ir_variables with an association
7538 * with this uniform block.
7540 enum glsl_interface_packing packing
;
7541 if (this->layout
.flags
.q
.shared
) {
7542 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7543 } else if (this->layout
.flags
.q
.packed
) {
7544 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7545 } else if (this->layout
.flags
.q
.std430
) {
7546 packing
= GLSL_INTERFACE_PACKING_STD430
;
7548 /* The default layout is std140.
7550 packing
= GLSL_INTERFACE_PACKING_STD140
;
7553 ir_variable_mode var_mode
;
7554 const char *iface_type_name
;
7555 if (this->layout
.flags
.q
.in
) {
7556 var_mode
= ir_var_shader_in
;
7557 iface_type_name
= "in";
7558 } else if (this->layout
.flags
.q
.out
) {
7559 var_mode
= ir_var_shader_out
;
7560 iface_type_name
= "out";
7561 } else if (this->layout
.flags
.q
.uniform
) {
7562 var_mode
= ir_var_uniform
;
7563 iface_type_name
= "uniform";
7564 } else if (this->layout
.flags
.q
.buffer
) {
7565 var_mode
= ir_var_shader_storage
;
7566 iface_type_name
= "buffer";
7568 var_mode
= ir_var_auto
;
7569 iface_type_name
= "UNKNOWN";
7570 assert(!"interface block layout qualifier not found!");
7573 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7574 if (this->layout
.flags
.q
.row_major
)
7575 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7576 else if (this->layout
.flags
.q
.column_major
)
7577 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7579 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7580 exec_list declared_variables
;
7581 glsl_struct_field
*fields
;
7583 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7584 * that we don't have incompatible qualifiers
7586 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7587 _mesa_glsl_error(&loc
, state
,
7588 "Interface block sets both readonly and writeonly");
7591 unsigned qual_stream
;
7592 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7594 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7595 /* If the stream qualifier is invalid it doesn't make sense to continue
7596 * on and try to compare stream layouts on member variables against it
7597 * so just return early.
7602 unsigned qual_xfb_buffer
;
7603 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7604 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7605 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7609 unsigned qual_xfb_offset
;
7610 if (layout
.flags
.q
.explicit_xfb_offset
) {
7611 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7612 layout
.offset
, &qual_xfb_offset
)) {
7617 unsigned qual_xfb_stride
;
7618 if (layout
.flags
.q
.explicit_xfb_stride
) {
7619 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7620 layout
.xfb_stride
, &qual_xfb_stride
)) {
7625 unsigned expl_location
= 0;
7626 if (layout
.flags
.q
.explicit_location
) {
7627 if (!process_qualifier_constant(state
, &loc
, "location",
7628 layout
.location
, &expl_location
)) {
7631 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7632 : VARYING_SLOT_VAR0
;
7636 unsigned expl_align
= 0;
7637 if (layout
.flags
.q
.explicit_align
) {
7638 if (!process_qualifier_constant(state
, &loc
, "align",
7639 layout
.align
, &expl_align
)) {
7642 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7643 _mesa_glsl_error(&loc
, state
, "align layout qualifier is not a "
7650 unsigned int num_variables
=
7651 ast_process_struct_or_iface_block_members(&declared_variables
,
7653 &this->declarations
,
7657 redeclaring_per_vertex
,
7666 if (!redeclaring_per_vertex
) {
7667 validate_identifier(this->block_name
, loc
, state
);
7669 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7671 * "Block names have no other use within a shader beyond interface
7672 * matching; it is a compile-time error to use a block name at global
7673 * scope for anything other than as a block name."
7675 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7676 if (var
&& !var
->type
->is_interface()) {
7677 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7678 "already used in the scope.",
7683 const glsl_type
*earlier_per_vertex
= NULL
;
7684 if (redeclaring_per_vertex
) {
7685 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7686 * the named interface block gl_in, we can find it by looking at the
7687 * previous declaration of gl_in. Otherwise we can find it by looking
7688 * at the previous decalartion of any of the built-in outputs,
7691 * Also check that the instance name and array-ness of the redeclaration
7695 case ir_var_shader_in
:
7696 if (ir_variable
*earlier_gl_in
=
7697 state
->symbols
->get_variable("gl_in")) {
7698 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7700 _mesa_glsl_error(&loc
, state
,
7701 "redeclaration of gl_PerVertex input not allowed "
7703 _mesa_shader_stage_to_string(state
->stage
));
7705 if (this->instance_name
== NULL
||
7706 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7707 !this->array_specifier
->is_single_dimension()) {
7708 _mesa_glsl_error(&loc
, state
,
7709 "gl_PerVertex input must be redeclared as "
7713 case ir_var_shader_out
:
7714 if (ir_variable
*earlier_gl_Position
=
7715 state
->symbols
->get_variable("gl_Position")) {
7716 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7717 } else if (ir_variable
*earlier_gl_out
=
7718 state
->symbols
->get_variable("gl_out")) {
7719 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7721 _mesa_glsl_error(&loc
, state
,
7722 "redeclaration of gl_PerVertex output not "
7723 "allowed in the %s shader",
7724 _mesa_shader_stage_to_string(state
->stage
));
7726 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7727 if (this->instance_name
== NULL
||
7728 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7729 _mesa_glsl_error(&loc
, state
,
7730 "gl_PerVertex output must be redeclared as "
7734 if (this->instance_name
!= NULL
) {
7735 _mesa_glsl_error(&loc
, state
,
7736 "gl_PerVertex output may not be redeclared with "
7737 "an instance name");
7742 _mesa_glsl_error(&loc
, state
,
7743 "gl_PerVertex must be declared as an input or an "
7748 if (earlier_per_vertex
== NULL
) {
7749 /* An error has already been reported. Bail out to avoid null
7750 * dereferences later in this function.
7755 /* Copy locations from the old gl_PerVertex interface block. */
7756 for (unsigned i
= 0; i
< num_variables
; i
++) {
7757 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7759 _mesa_glsl_error(&loc
, state
,
7760 "redeclaration of gl_PerVertex must be a subset "
7761 "of the built-in members of gl_PerVertex");
7763 fields
[i
].location
=
7764 earlier_per_vertex
->fields
.structure
[j
].location
;
7766 earlier_per_vertex
->fields
.structure
[j
].offset
;
7767 fields
[i
].interpolation
=
7768 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7769 fields
[i
].centroid
=
7770 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7772 earlier_per_vertex
->fields
.structure
[j
].sample
;
7774 earlier_per_vertex
->fields
.structure
[j
].patch
;
7775 fields
[i
].precision
=
7776 earlier_per_vertex
->fields
.structure
[j
].precision
;
7777 fields
[i
].explicit_xfb_buffer
=
7778 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7779 fields
[i
].xfb_buffer
=
7780 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7781 fields
[i
].xfb_stride
=
7782 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7786 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7789 * If a built-in interface block is redeclared, it must appear in
7790 * the shader before any use of any member included in the built-in
7791 * declaration, or a compilation error will result.
7793 * This appears to be a clarification to the behaviour established for
7794 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7795 * regardless of GLSL version.
7797 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7798 v
.run(instructions
);
7799 if (v
.usage_found()) {
7800 _mesa_glsl_error(&loc
, state
,
7801 "redeclaration of a built-in interface block must "
7802 "appear before any use of any member of the "
7807 const glsl_type
*block_type
=
7808 glsl_type::get_interface_instance(fields
,
7812 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
7815 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7817 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7818 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7821 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7822 YYLTYPE loc
= this->get_location();
7823 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7824 "already taken in the current scope",
7825 this->block_name
, iface_type_name
);
7828 /* Since interface blocks cannot contain statements, it should be
7829 * impossible for the block to generate any instructions.
7831 assert(declared_variables
.is_empty());
7833 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7835 * Geometry shader input variables get the per-vertex values written
7836 * out by vertex shader output variables of the same names. Since a
7837 * geometry shader operates on a set of vertices, each input varying
7838 * variable (or input block, see interface blocks below) needs to be
7839 * declared as an array.
7841 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7842 var_mode
== ir_var_shader_in
) {
7843 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7844 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7845 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7846 !this->layout
.flags
.q
.patch
&&
7847 this->array_specifier
== NULL
&&
7848 var_mode
== ir_var_shader_in
) {
7849 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7850 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7851 !this->layout
.flags
.q
.patch
&&
7852 this->array_specifier
== NULL
&&
7853 var_mode
== ir_var_shader_out
) {
7854 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7858 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7861 * "If an instance name (instance-name) is used, then it puts all the
7862 * members inside a scope within its own name space, accessed with the
7863 * field selector ( . ) operator (analogously to structures)."
7865 if (this->instance_name
) {
7866 if (redeclaring_per_vertex
) {
7867 /* When a built-in in an unnamed interface block is redeclared,
7868 * get_variable_being_redeclared() calls
7869 * check_builtin_array_max_size() to make sure that built-in array
7870 * variables aren't redeclared to illegal sizes. But we're looking
7871 * at a redeclaration of a named built-in interface block. So we
7872 * have to manually call check_builtin_array_max_size() for all parts
7873 * of the interface that are arrays.
7875 for (unsigned i
= 0; i
< num_variables
; i
++) {
7876 if (fields
[i
].type
->is_array()) {
7877 const unsigned size
= fields
[i
].type
->array_size();
7878 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7882 validate_identifier(this->instance_name
, loc
, state
);
7887 if (this->array_specifier
!= NULL
) {
7888 const glsl_type
*block_array_type
=
7889 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7891 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7893 * For uniform blocks declared an array, each individual array
7894 * element corresponds to a separate buffer object backing one
7895 * instance of the block. As the array size indicates the number
7896 * of buffer objects needed, uniform block array declarations
7897 * must specify an array size.
7899 * And a few paragraphs later:
7901 * Geometry shader input blocks must be declared as arrays and
7902 * follow the array declaration and linking rules for all
7903 * geometry shader inputs. All other input and output block
7904 * arrays must specify an array size.
7906 * The same applies to tessellation shaders.
7908 * The upshot of this is that the only circumstance where an
7909 * interface array size *doesn't* need to be specified is on a
7910 * geometry shader input, tessellation control shader input,
7911 * tessellation control shader output, and tessellation evaluation
7914 if (block_array_type
->is_unsized_array()) {
7915 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7916 state
->stage
== MESA_SHADER_TESS_CTRL
||
7917 state
->stage
== MESA_SHADER_TESS_EVAL
;
7918 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7920 if (this->layout
.flags
.q
.in
) {
7922 _mesa_glsl_error(&loc
, state
,
7923 "unsized input block arrays not allowed in "
7925 _mesa_shader_stage_to_string(state
->stage
));
7926 } else if (this->layout
.flags
.q
.out
) {
7928 _mesa_glsl_error(&loc
, state
,
7929 "unsized output block arrays not allowed in "
7931 _mesa_shader_stage_to_string(state
->stage
));
7933 /* by elimination, this is a uniform block array */
7934 _mesa_glsl_error(&loc
, state
,
7935 "unsized uniform block arrays not allowed in "
7937 _mesa_shader_stage_to_string(state
->stage
));
7941 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7943 * * Arrays of arrays of blocks are not allowed
7945 if (state
->es_shader
&& block_array_type
->is_array() &&
7946 block_array_type
->fields
.array
->is_array()) {
7947 _mesa_glsl_error(&loc
, state
,
7948 "arrays of arrays interface blocks are "
7952 var
= new(state
) ir_variable(block_array_type
,
7953 this->instance_name
,
7956 var
= new(state
) ir_variable(block_type
,
7957 this->instance_name
,
7961 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7962 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7964 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7965 var
->data
.read_only
= true;
7967 var
->data
.patch
= this->layout
.flags
.q
.patch
;
7969 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7970 handle_geometry_shader_input_decl(state
, loc
, var
);
7971 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7972 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7973 handle_tess_shader_input_decl(state
, loc
, var
);
7974 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7975 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7977 for (unsigned i
= 0; i
< num_variables
; i
++) {
7978 if (var
->data
.mode
== ir_var_shader_storage
)
7979 apply_memory_qualifiers(var
, fields
[i
]);
7982 if (ir_variable
*earlier
=
7983 state
->symbols
->get_variable(this->instance_name
)) {
7984 if (!redeclaring_per_vertex
) {
7985 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7986 this->instance_name
);
7988 earlier
->data
.how_declared
= ir_var_declared_normally
;
7989 earlier
->type
= var
->type
;
7990 earlier
->reinit_interface_type(block_type
);
7993 if (this->layout
.flags
.q
.explicit_binding
) {
7994 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7998 var
->data
.stream
= qual_stream
;
7999 if (layout
.flags
.q
.explicit_location
) {
8000 var
->data
.location
= expl_location
;
8001 var
->data
.explicit_location
= true;
8004 state
->symbols
->add_variable(var
);
8005 instructions
->push_tail(var
);
8008 /* In order to have an array size, the block must also be declared with
8011 assert(this->array_specifier
== NULL
);
8013 for (unsigned i
= 0; i
< num_variables
; i
++) {
8015 new(state
) ir_variable(fields
[i
].type
,
8016 ralloc_strdup(state
, fields
[i
].name
),
8018 var
->data
.interpolation
= fields
[i
].interpolation
;
8019 var
->data
.centroid
= fields
[i
].centroid
;
8020 var
->data
.sample
= fields
[i
].sample
;
8021 var
->data
.patch
= fields
[i
].patch
;
8022 var
->data
.stream
= qual_stream
;
8023 var
->data
.location
= fields
[i
].location
;
8025 if (fields
[i
].location
!= -1)
8026 var
->data
.explicit_location
= true;
8028 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
8029 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
8031 if (fields
[i
].offset
!= -1)
8032 var
->data
.explicit_xfb_offset
= true;
8033 var
->data
.offset
= fields
[i
].offset
;
8035 var
->init_interface_type(block_type
);
8037 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8038 var
->data
.read_only
= true;
8040 /* Precision qualifiers do not have any meaning in Desktop GLSL */
8041 if (state
->es_shader
) {
8042 var
->data
.precision
=
8043 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
8047 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
8048 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8049 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8051 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
8054 if (var
->data
.mode
== ir_var_shader_storage
)
8055 apply_memory_qualifiers(var
, fields
[i
]);
8057 /* Examine var name here since var may get deleted in the next call */
8058 bool var_is_gl_id
= is_gl_identifier(var
->name
);
8060 if (redeclaring_per_vertex
) {
8061 bool is_redeclaration
;
8062 ir_variable
*declared_var
=
8063 get_variable_being_redeclared(var
, loc
, state
,
8064 true /* allow_all_redeclarations */,
8066 if (!var_is_gl_id
|| !is_redeclaration
) {
8067 _mesa_glsl_error(&loc
, state
,
8068 "redeclaration of gl_PerVertex can only "
8069 "include built-in variables");
8070 } else if (declared_var
->data
.how_declared
== ir_var_declared_normally
) {
8071 _mesa_glsl_error(&loc
, state
,
8072 "`%s' has already been redeclared",
8073 declared_var
->name
);
8075 declared_var
->data
.how_declared
= ir_var_declared_in_block
;
8076 declared_var
->reinit_interface_type(block_type
);
8081 if (state
->symbols
->get_variable(var
->name
) != NULL
)
8082 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
8084 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
8085 * The UBO declaration itself doesn't get an ir_variable unless it
8086 * has an instance name. This is ugly.
8088 if (this->layout
.flags
.q
.explicit_binding
) {
8089 apply_explicit_binding(state
, &loc
, var
,
8090 var
->get_interface_type(), &this->layout
);
8093 if (var
->type
->is_unsized_array()) {
8094 if (var
->is_in_shader_storage_block() &&
8095 is_unsized_array_last_element(var
)) {
8096 var
->data
.from_ssbo_unsized_array
= true;
8098 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
8100 * "If an array is declared as the last member of a shader storage
8101 * block and the size is not specified at compile-time, it is
8102 * sized at run-time. In all other cases, arrays are sized only
8105 * In desktop GLSL it is allowed to have unsized-arrays that are
8106 * not last, as long as we can determine that they are implicitly
8109 if (state
->es_shader
) {
8110 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
8111 "definition: only last member of a shader "
8112 "storage block can be defined as unsized "
8113 "array", fields
[i
].name
);
8118 state
->symbols
->add_variable(var
);
8119 instructions
->push_tail(var
);
8122 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
8123 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
8125 * It is also a compilation error ... to redeclare a built-in
8126 * block and then use a member from that built-in block that was
8127 * not included in the redeclaration.
8129 * This appears to be a clarification to the behaviour established
8130 * for gl_PerVertex by GLSL 1.50, therefore we implement this
8131 * behaviour regardless of GLSL version.
8133 * To prevent the shader from using a member that was not included in
8134 * the redeclaration, we disable any ir_variables that are still
8135 * associated with the old declaration of gl_PerVertex (since we've
8136 * already updated all of the variables contained in the new
8137 * gl_PerVertex to point to it).
8139 * As a side effect this will prevent
8140 * validate_intrastage_interface_blocks() from getting confused and
8141 * thinking there are conflicting definitions of gl_PerVertex in the
8144 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8145 ir_variable
*const var
= node
->as_variable();
8147 var
->get_interface_type() == earlier_per_vertex
&&
8148 var
->data
.mode
== var_mode
) {
8149 if (var
->data
.how_declared
== ir_var_declared_normally
) {
8150 _mesa_glsl_error(&loc
, state
,
8151 "redeclaration of gl_PerVertex cannot "
8152 "follow a redeclaration of `%s'",
8155 state
->symbols
->disable_variable(var
->name
);
8167 ast_tcs_output_layout::hir(exec_list
*instructions
,
8168 struct _mesa_glsl_parse_state
*state
)
8170 YYLTYPE loc
= this->get_location();
8172 unsigned num_vertices
;
8173 if (!state
->out_qualifier
->vertices
->
8174 process_qualifier_constant(state
, "vertices", &num_vertices
,
8176 /* return here to stop cascading incorrect error messages */
8180 /* If any shader outputs occurred before this declaration and specified an
8181 * array size, make sure the size they specified is consistent with the
8184 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8185 _mesa_glsl_error(&loc
, state
,
8186 "this tessellation control shader output layout "
8187 "specifies %u vertices, but a previous output "
8188 "is declared with size %u",
8189 num_vertices
, state
->tcs_output_size
);
8193 state
->tcs_output_vertices_specified
= true;
8195 /* If any shader outputs occurred before this declaration and did not
8196 * specify an array size, their size is determined now.
8198 foreach_in_list (ir_instruction
, node
, instructions
) {
8199 ir_variable
*var
= node
->as_variable();
8200 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8203 /* Note: Not all tessellation control shader output are arrays. */
8204 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8207 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8208 _mesa_glsl_error(&loc
, state
,
8209 "this tessellation control shader output layout "
8210 "specifies %u vertices, but an access to element "
8211 "%u of output `%s' already exists", num_vertices
,
8212 var
->data
.max_array_access
, var
->name
);
8214 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8224 ast_gs_input_layout::hir(exec_list
*instructions
,
8225 struct _mesa_glsl_parse_state
*state
)
8227 YYLTYPE loc
= this->get_location();
8229 /* Should have been prevented by the parser. */
8230 assert(!state
->gs_input_prim_type_specified
8231 || state
->in_qualifier
->prim_type
== this->prim_type
);
8233 /* If any shader inputs occurred before this declaration and specified an
8234 * array size, make sure the size they specified is consistent with the
8237 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8238 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8239 _mesa_glsl_error(&loc
, state
,
8240 "this geometry shader input layout implies %u vertices"
8241 " per primitive, but a previous input is declared"
8242 " with size %u", num_vertices
, state
->gs_input_size
);
8246 state
->gs_input_prim_type_specified
= true;
8248 /* If any shader inputs occurred before this declaration and did not
8249 * specify an array size, their size is determined now.
8251 foreach_in_list(ir_instruction
, node
, instructions
) {
8252 ir_variable
*var
= node
->as_variable();
8253 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8256 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8260 if (var
->type
->is_unsized_array()) {
8261 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8262 _mesa_glsl_error(&loc
, state
,
8263 "this geometry shader input layout implies %u"
8264 " vertices, but an access to element %u of input"
8265 " `%s' already exists", num_vertices
,
8266 var
->data
.max_array_access
, var
->name
);
8268 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8279 ast_cs_input_layout::hir(exec_list
*instructions
,
8280 struct _mesa_glsl_parse_state
*state
)
8282 YYLTYPE loc
= this->get_location();
8284 /* From the ARB_compute_shader specification:
8286 * If the local size of the shader in any dimension is greater
8287 * than the maximum size supported by the implementation for that
8288 * dimension, a compile-time error results.
8290 * It is not clear from the spec how the error should be reported if
8291 * the total size of the work group exceeds
8292 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8293 * report it at compile time as well.
8295 GLuint64 total_invocations
= 1;
8296 unsigned qual_local_size
[3];
8297 for (int i
= 0; i
< 3; i
++) {
8299 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8301 /* Infer a local_size of 1 for unspecified dimensions */
8302 if (this->local_size
[i
] == NULL
) {
8303 qual_local_size
[i
] = 1;
8304 } else if (!this->local_size
[i
]->
8305 process_qualifier_constant(state
, local_size_str
,
8306 &qual_local_size
[i
], false)) {
8307 ralloc_free(local_size_str
);
8310 ralloc_free(local_size_str
);
8312 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8313 _mesa_glsl_error(&loc
, state
,
8314 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8316 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8319 total_invocations
*= qual_local_size
[i
];
8320 if (total_invocations
>
8321 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8322 _mesa_glsl_error(&loc
, state
,
8323 "product of local_sizes exceeds "
8324 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8325 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8330 /* If any compute input layout declaration preceded this one, make sure it
8331 * was consistent with this one.
8333 if (state
->cs_input_local_size_specified
) {
8334 for (int i
= 0; i
< 3; i
++) {
8335 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8336 _mesa_glsl_error(&loc
, state
,
8337 "compute shader input layout does not match"
8338 " previous declaration");
8344 /* The ARB_compute_variable_group_size spec says:
8346 * If a compute shader including a *local_size_variable* qualifier also
8347 * declares a fixed local group size using the *local_size_x*,
8348 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8351 if (state
->cs_input_local_size_variable_specified
) {
8352 _mesa_glsl_error(&loc
, state
,
8353 "compute shader can't include both a variable and a "
8354 "fixed local group size");
8358 state
->cs_input_local_size_specified
= true;
8359 for (int i
= 0; i
< 3; i
++)
8360 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8362 /* We may now declare the built-in constant gl_WorkGroupSize (see
8363 * builtin_variable_generator::generate_constants() for why we didn't
8364 * declare it earlier).
8366 ir_variable
*var
= new(state
->symbols
)
8367 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8368 var
->data
.how_declared
= ir_var_declared_implicitly
;
8369 var
->data
.read_only
= true;
8370 instructions
->push_tail(var
);
8371 state
->symbols
->add_variable(var
);
8372 ir_constant_data data
;
8373 memset(&data
, 0, sizeof(data
));
8374 for (int i
= 0; i
< 3; i
++)
8375 data
.u
[i
] = qual_local_size
[i
];
8376 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8377 var
->constant_initializer
=
8378 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8379 var
->data
.has_initializer
= true;
8386 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8387 exec_list
*instructions
)
8389 bool gl_FragColor_assigned
= false;
8390 bool gl_FragData_assigned
= false;
8391 bool gl_FragSecondaryColor_assigned
= false;
8392 bool gl_FragSecondaryData_assigned
= false;
8393 bool user_defined_fs_output_assigned
= false;
8394 ir_variable
*user_defined_fs_output
= NULL
;
8396 /* It would be nice to have proper location information. */
8398 memset(&loc
, 0, sizeof(loc
));
8400 foreach_in_list(ir_instruction
, node
, instructions
) {
8401 ir_variable
*var
= node
->as_variable();
8403 if (!var
|| !var
->data
.assigned
)
8406 if (strcmp(var
->name
, "gl_FragColor") == 0)
8407 gl_FragColor_assigned
= true;
8408 else if (strcmp(var
->name
, "gl_FragData") == 0)
8409 gl_FragData_assigned
= true;
8410 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8411 gl_FragSecondaryColor_assigned
= true;
8412 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8413 gl_FragSecondaryData_assigned
= true;
8414 else if (!is_gl_identifier(var
->name
)) {
8415 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8416 var
->data
.mode
== ir_var_shader_out
) {
8417 user_defined_fs_output_assigned
= true;
8418 user_defined_fs_output
= var
;
8423 /* From the GLSL 1.30 spec:
8425 * "If a shader statically assigns a value to gl_FragColor, it
8426 * may not assign a value to any element of gl_FragData. If a
8427 * shader statically writes a value to any element of
8428 * gl_FragData, it may not assign a value to
8429 * gl_FragColor. That is, a shader may assign values to either
8430 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8431 * linked together must also consistently write just one of
8432 * these variables. Similarly, if user declared output
8433 * variables are in use (statically assigned to), then the
8434 * built-in variables gl_FragColor and gl_FragData may not be
8435 * assigned to. These incorrect usages all generate compile
8438 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8439 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8440 "`gl_FragColor' and `gl_FragData'");
8441 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8442 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8443 "`gl_FragColor' and `%s'",
8444 user_defined_fs_output
->name
);
8445 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8446 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8447 "`gl_FragSecondaryColorEXT' and"
8448 " `gl_FragSecondaryDataEXT'");
8449 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8450 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8451 "`gl_FragColor' and"
8452 " `gl_FragSecondaryDataEXT'");
8453 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8454 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8456 " `gl_FragSecondaryColorEXT'");
8457 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8458 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8459 "`gl_FragData' and `%s'",
8460 user_defined_fs_output
->name
);
8463 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8464 !state
->EXT_blend_func_extended_enable
) {
8465 _mesa_glsl_error(&loc
, state
,
8466 "Dual source blending requires EXT_blend_func_extended");
8472 remove_per_vertex_blocks(exec_list
*instructions
,
8473 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8475 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8476 * if it exists in this shader type.
8478 const glsl_type
*per_vertex
= NULL
;
8480 case ir_var_shader_in
:
8481 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8482 per_vertex
= gl_in
->get_interface_type();
8484 case ir_var_shader_out
:
8485 if (ir_variable
*gl_Position
=
8486 state
->symbols
->get_variable("gl_Position")) {
8487 per_vertex
= gl_Position
->get_interface_type();
8491 assert(!"Unexpected mode");
8495 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8496 * need to do anything.
8498 if (per_vertex
== NULL
)
8501 /* If the interface block is used by the shader, then we don't need to do
8504 interface_block_usage_visitor
v(mode
, per_vertex
);
8505 v
.run(instructions
);
8506 if (v
.usage_found())
8509 /* Remove any ir_variable declarations that refer to the interface block
8512 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8513 ir_variable
*const var
= node
->as_variable();
8514 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8515 var
->data
.mode
== mode
) {
8516 state
->symbols
->disable_variable(var
->name
);