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/mtypes.h"
58 #include "main/macros.h"
59 #include "main/shaderobj.h"
61 #include "ir_builder.h"
62 #include "builtin_functions.h"
64 using namespace ir_builder
;
67 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
68 exec_list
*instructions
);
70 remove_per_vertex_blocks(exec_list
*instructions
,
71 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
74 * Visitor class that finds the first instance of any write-only variable that
75 * is ever read, if any
77 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
80 read_from_write_only_variable_visitor() : found(NULL
)
84 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
86 if (this->in_assignee
)
87 return visit_continue
;
89 ir_variable
*var
= ir
->variable_referenced();
90 /* We can have memory_write_only set on both images and buffer variables,
91 * but in the former there is a distinction between reads from
92 * the variable itself (write_only) and from the memory they point to
93 * (memory_write_only), while in the case of buffer variables there is
94 * no such distinction, that is why this check here is limited to
95 * buffer variables alone.
97 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
98 return visit_continue
;
100 if (var
->data
.memory_write_only
) {
105 return visit_continue
;
108 ir_variable
*get_variable() {
112 virtual ir_visitor_status
visit_enter(ir_expression
*ir
)
114 /* .length() doesn't actually read anything */
115 if (ir
->operation
== ir_unop_ssbo_unsized_array_length
)
116 return visit_continue_with_parent
;
118 return visit_continue
;
126 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
128 _mesa_glsl_initialize_variables(instructions
, state
);
130 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
132 state
->current_function
= NULL
;
134 state
->toplevel_ir
= instructions
;
136 state
->gs_input_prim_type_specified
= false;
137 state
->tcs_output_vertices_specified
= false;
138 state
->cs_input_local_size_specified
= false;
140 /* Section 4.2 of the GLSL 1.20 specification states:
141 * "The built-in functions are scoped in a scope outside the global scope
142 * users declare global variables in. That is, a shader's global scope,
143 * available for user-defined functions and global variables, is nested
144 * inside the scope containing the built-in functions."
146 * Since built-in functions like ftransform() access built-in variables,
147 * it follows that those must be in the outer scope as well.
149 * We push scope here to create this nesting effect...but don't pop.
150 * This way, a shader's globals are still in the symbol table for use
153 state
->symbols
->push_scope();
155 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
156 ast
->hir(instructions
, state
);
158 detect_recursion_unlinked(state
, instructions
);
159 detect_conflicting_assignments(state
, instructions
);
161 state
->toplevel_ir
= NULL
;
163 /* Move all of the variable declarations to the front of the IR list, and
164 * reverse the order. This has the (intended!) side effect that vertex
165 * shader inputs and fragment shader outputs will appear in the IR in the
166 * same order that they appeared in the shader code. This results in the
167 * locations being assigned in the declared order. Many (arguably buggy)
168 * applications depend on this behavior, and it matches what nearly all
171 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
172 ir_variable
*const var
= node
->as_variable();
178 instructions
->push_head(var
);
181 /* Figure out if gl_FragCoord is actually used in fragment shader */
182 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
184 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
186 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
188 * If multiple shaders using members of a built-in block belonging to
189 * the same interface are linked together in the same program, they
190 * must all redeclare the built-in block in the same way, as described
191 * in section 4.3.7 "Interface Blocks" for interface block matching, or
192 * a link error will result.
194 * The phrase "using members of a built-in block" implies that if two
195 * shaders are linked together and one of them *does not use* any members
196 * of the built-in block, then that shader does not need to have a matching
197 * redeclaration of the built-in block.
199 * This appears to be a clarification to the behaviour established for
200 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
203 * The definition of "interface" in section 4.3.7 that applies here is as
206 * The boundary between adjacent programmable pipeline stages: This
207 * spans all the outputs in all compilation units of the first stage
208 * and all the inputs in all compilation units of the second stage.
210 * Therefore this rule applies to both inter- and intra-stage linking.
212 * The easiest way to implement this is to check whether the shader uses
213 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
214 * remove all the relevant variable declaration from the IR, so that the
215 * linker won't see them and complain about mismatches.
217 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
218 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
220 /* Check that we don't have reads from write-only variables */
221 read_from_write_only_variable_visitor v
;
223 ir_variable
*error_var
= v
.get_variable();
225 /* It would be nice to have proper location information, but for that
226 * we would need to check this as we process each kind of AST node
229 memset(&loc
, 0, sizeof(loc
));
230 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
236 static ir_expression_operation
237 get_implicit_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
238 struct _mesa_glsl_parse_state
*state
)
240 switch (to
->base_type
) {
241 case GLSL_TYPE_FLOAT
:
242 switch (from
->base_type
) {
243 case GLSL_TYPE_INT
: return ir_unop_i2f
;
244 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
245 default: return (ir_expression_operation
)0;
249 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
250 && !state
->MESA_shader_integer_functions_enable
)
251 return (ir_expression_operation
)0;
252 switch (from
->base_type
) {
253 case GLSL_TYPE_INT
: return ir_unop_i2u
;
254 default: return (ir_expression_operation
)0;
257 case GLSL_TYPE_DOUBLE
:
258 if (!state
->has_double())
259 return (ir_expression_operation
)0;
260 switch (from
->base_type
) {
261 case GLSL_TYPE_INT
: return ir_unop_i2d
;
262 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
263 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
264 case GLSL_TYPE_INT64
: return ir_unop_i642d
;
265 case GLSL_TYPE_UINT64
: return ir_unop_u642d
;
266 default: return (ir_expression_operation
)0;
269 case GLSL_TYPE_UINT64
:
270 if (!state
->has_int64())
271 return (ir_expression_operation
)0;
272 switch (from
->base_type
) {
273 case GLSL_TYPE_INT
: return ir_unop_i2u64
;
274 case GLSL_TYPE_UINT
: return ir_unop_u2u64
;
275 case GLSL_TYPE_INT64
: return ir_unop_i642u64
;
276 default: return (ir_expression_operation
)0;
279 case GLSL_TYPE_INT64
:
280 if (!state
->has_int64())
281 return (ir_expression_operation
)0;
282 switch (from
->base_type
) {
283 case GLSL_TYPE_INT
: return ir_unop_i2i64
;
284 default: return (ir_expression_operation
)0;
287 default: return (ir_expression_operation
)0;
293 * If a conversion is available, convert one operand to a different type
295 * The \c from \c ir_rvalue is converted "in place".
297 * \param to Type that the operand it to be converted to
298 * \param from Operand that is being converted
299 * \param state GLSL compiler state
302 * If a conversion is possible (or unnecessary), \c true is returned.
303 * Otherwise \c false is returned.
306 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
307 struct _mesa_glsl_parse_state
*state
)
310 if (to
->base_type
== from
->type
->base_type
)
313 /* Prior to GLSL 1.20, there are no implicit conversions */
314 if (!state
->is_version(120, 0))
317 /* ESSL does not allow implicit conversions */
318 if (state
->es_shader
)
321 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
323 * "There are no implicit array or structure conversions. For
324 * example, an array of int cannot be implicitly converted to an
327 if (!to
->is_numeric() || !from
->type
->is_numeric())
330 /* We don't actually want the specific type `to`, we want a type
331 * with the same base type as `to`, but the same vector width as
334 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
335 from
->type
->matrix_columns
);
337 ir_expression_operation op
= get_implicit_conversion_operation(to
, from
->type
, state
);
339 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
347 static const struct glsl_type
*
348 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
350 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
352 const glsl_type
*type_a
= value_a
->type
;
353 const glsl_type
*type_b
= value_b
->type
;
355 /* From GLSL 1.50 spec, page 56:
357 * "The arithmetic binary operators add (+), subtract (-),
358 * multiply (*), and divide (/) operate on integer and
359 * floating-point scalars, vectors, and matrices."
361 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
362 _mesa_glsl_error(loc
, state
,
363 "operands to arithmetic operators must be numeric");
364 return glsl_type::error_type
;
368 /* "If one operand is floating-point based and the other is
369 * not, then the conversions from Section 4.1.10 "Implicit
370 * Conversions" are applied to the non-floating-point-based operand."
372 if (!apply_implicit_conversion(type_a
, value_b
, state
)
373 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
374 _mesa_glsl_error(loc
, state
,
375 "could not implicitly convert operands to "
376 "arithmetic operator");
377 return glsl_type::error_type
;
379 type_a
= value_a
->type
;
380 type_b
= value_b
->type
;
382 /* "If the operands are integer types, they must both be signed or
385 * From this rule and the preceeding conversion it can be inferred that
386 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
387 * The is_numeric check above already filtered out the case where either
388 * type is not one of these, so now the base types need only be tested for
391 if (type_a
->base_type
!= type_b
->base_type
) {
392 _mesa_glsl_error(loc
, state
,
393 "base type mismatch for arithmetic operator");
394 return glsl_type::error_type
;
397 /* "All arithmetic binary operators result in the same fundamental type
398 * (signed integer, unsigned integer, or floating-point) as the
399 * operands they operate on, after operand type conversion. After
400 * conversion, the following cases are valid
402 * * The two operands are scalars. In this case the operation is
403 * applied, resulting in a scalar."
405 if (type_a
->is_scalar() && type_b
->is_scalar())
408 /* "* One operand is a scalar, and the other is a vector or matrix.
409 * In this case, the scalar operation is applied independently to each
410 * component of the vector or matrix, resulting in the same size
413 if (type_a
->is_scalar()) {
414 if (!type_b
->is_scalar())
416 } else if (type_b
->is_scalar()) {
420 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
421 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
424 assert(!type_a
->is_scalar());
425 assert(!type_b
->is_scalar());
427 /* "* The two operands are vectors of the same size. In this case, the
428 * operation is done component-wise resulting in the same size
431 if (type_a
->is_vector() && type_b
->is_vector()) {
432 if (type_a
== type_b
) {
435 _mesa_glsl_error(loc
, state
,
436 "vector size mismatch for arithmetic operator");
437 return glsl_type::error_type
;
441 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
442 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
443 * <vector, vector> have been handled. At least one of the operands must
444 * be matrix. Further, since there are no integer matrix types, the base
445 * type of both operands must be float.
447 assert(type_a
->is_matrix() || type_b
->is_matrix());
448 assert(type_a
->is_float() || type_a
->is_double());
449 assert(type_b
->is_float() || type_b
->is_double());
451 /* "* The operator is add (+), subtract (-), or divide (/), and the
452 * operands are matrices with the same number of rows and the same
453 * number of columns. In this case, the operation is done component-
454 * wise resulting in the same size matrix."
455 * * The operator is multiply (*), where both operands are matrices or
456 * one operand is a vector and the other a matrix. A right vector
457 * operand is treated as a column vector and a left vector operand as a
458 * row vector. In all these cases, it is required that the number of
459 * columns of the left operand is equal to the number of rows of the
460 * right operand. Then, the multiply (*) operation does a linear
461 * algebraic multiply, yielding an object that has the same number of
462 * rows as the left operand and the same number of columns as the right
463 * operand. Section 5.10 "Vector and Matrix Operations" explains in
464 * more detail how vectors and matrices are operated on."
467 if (type_a
== type_b
)
470 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
472 if (type
== glsl_type::error_type
) {
473 _mesa_glsl_error(loc
, state
,
474 "size mismatch for matrix multiplication");
481 /* "All other cases are illegal."
483 _mesa_glsl_error(loc
, state
, "type mismatch");
484 return glsl_type::error_type
;
488 static const struct glsl_type
*
489 unary_arithmetic_result_type(const struct glsl_type
*type
,
490 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
492 /* From GLSL 1.50 spec, page 57:
494 * "The arithmetic unary operators negate (-), post- and pre-increment
495 * and decrement (-- and ++) operate on integer or floating-point
496 * values (including vectors and matrices). All unary operators work
497 * component-wise on their operands. These result with the same type
500 if (!type
->is_numeric()) {
501 _mesa_glsl_error(loc
, state
,
502 "operands to arithmetic operators must be numeric");
503 return glsl_type::error_type
;
510 * \brief Return the result type of a bit-logic operation.
512 * If the given types to the bit-logic operator are invalid, return
513 * glsl_type::error_type.
515 * \param value_a LHS of bit-logic op
516 * \param value_b RHS of bit-logic op
518 static const struct glsl_type
*
519 bit_logic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
521 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
523 const glsl_type
*type_a
= value_a
->type
;
524 const glsl_type
*type_b
= value_b
->type
;
526 if (!state
->check_bitwise_operations_allowed(loc
)) {
527 return glsl_type::error_type
;
530 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
532 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
533 * (|). The operands must be of type signed or unsigned integers or
536 if (!type_a
->is_integer_32_64()) {
537 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
538 ast_expression::operator_string(op
));
539 return glsl_type::error_type
;
541 if (!type_b
->is_integer_32_64()) {
542 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
543 ast_expression::operator_string(op
));
544 return glsl_type::error_type
;
547 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
548 * make sense for bitwise operations, as they don't operate on floats.
550 * GLSL 4.0 added implicit int -> uint conversions, which are relevant
551 * here. It wasn't clear whether or not we should apply them to bitwise
552 * operations. However, Khronos has decided that they should in future
553 * language revisions. Applications also rely on this behavior. We opt
554 * to apply them in general, but issue a portability warning.
556 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
558 if (type_a
->base_type
!= type_b
->base_type
) {
559 if (!apply_implicit_conversion(type_a
, value_b
, state
)
560 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
561 _mesa_glsl_error(loc
, state
,
562 "could not implicitly convert operands to "
564 ast_expression::operator_string(op
));
565 return glsl_type::error_type
;
567 _mesa_glsl_warning(loc
, state
,
568 "some implementations may not support implicit "
569 "int -> uint conversions for `%s' operators; "
570 "consider casting explicitly for portability",
571 ast_expression::operator_string(op
));
573 type_a
= value_a
->type
;
574 type_b
= value_b
->type
;
577 /* "The fundamental types of the operands (signed or unsigned) must
580 if (type_a
->base_type
!= type_b
->base_type
) {
581 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
582 "base type", ast_expression::operator_string(op
));
583 return glsl_type::error_type
;
586 /* "The operands cannot be vectors of differing size." */
587 if (type_a
->is_vector() &&
588 type_b
->is_vector() &&
589 type_a
->vector_elements
!= type_b
->vector_elements
) {
590 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
591 "different sizes", ast_expression::operator_string(op
));
592 return glsl_type::error_type
;
595 /* "If one operand is a scalar and the other a vector, the scalar is
596 * applied component-wise to the vector, resulting in the same type as
597 * the vector. The fundamental types of the operands [...] will be the
598 * resulting fundamental type."
600 if (type_a
->is_scalar())
606 static const struct glsl_type
*
607 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
608 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
610 const glsl_type
*type_a
= value_a
->type
;
611 const glsl_type
*type_b
= value_b
->type
;
613 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
614 return glsl_type::error_type
;
617 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
619 * "The operator modulus (%) operates on signed or unsigned integers or
622 if (!type_a
->is_integer_32_64()) {
623 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
624 return glsl_type::error_type
;
626 if (!type_b
->is_integer_32_64()) {
627 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
628 return glsl_type::error_type
;
631 /* "If the fundamental types in the operands do not match, then the
632 * conversions from section 4.1.10 "Implicit Conversions" are applied
633 * to create matching types."
635 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
636 * int -> uint conversion rules. Prior to that, there were no implicit
637 * conversions. So it's harmless to apply them universally - no implicit
638 * conversions will exist. If the types don't match, we'll receive false,
639 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
641 * "The operand types must both be signed or unsigned."
643 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
644 !apply_implicit_conversion(type_b
, value_a
, state
)) {
645 _mesa_glsl_error(loc
, state
,
646 "could not implicitly convert operands to "
647 "modulus (%%) operator");
648 return glsl_type::error_type
;
650 type_a
= value_a
->type
;
651 type_b
= value_b
->type
;
653 /* "The operands cannot be vectors of differing size. If one operand is
654 * a scalar and the other vector, then the scalar is applied component-
655 * wise to the vector, resulting in the same type as the vector. If both
656 * are vectors of the same size, the result is computed component-wise."
658 if (type_a
->is_vector()) {
659 if (!type_b
->is_vector()
660 || (type_a
->vector_elements
== type_b
->vector_elements
))
665 /* "The operator modulus (%) is not defined for any other data types
666 * (non-integer types)."
668 _mesa_glsl_error(loc
, state
, "type mismatch");
669 return glsl_type::error_type
;
673 static const struct glsl_type
*
674 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
675 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
677 const glsl_type
*type_a
= value_a
->type
;
678 const glsl_type
*type_b
= value_b
->type
;
680 /* From GLSL 1.50 spec, page 56:
681 * "The relational operators greater than (>), less than (<), greater
682 * than or equal (>=), and less than or equal (<=) operate only on
683 * scalar integer and scalar floating-point expressions."
685 if (!type_a
->is_numeric()
686 || !type_b
->is_numeric()
687 || !type_a
->is_scalar()
688 || !type_b
->is_scalar()) {
689 _mesa_glsl_error(loc
, state
,
690 "operands to relational operators must be scalar and "
692 return glsl_type::error_type
;
695 /* "Either the operands' types must match, or the conversions from
696 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
697 * operand, after which the types must match."
699 if (!apply_implicit_conversion(type_a
, value_b
, state
)
700 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
701 _mesa_glsl_error(loc
, state
,
702 "could not implicitly convert operands to "
703 "relational operator");
704 return glsl_type::error_type
;
706 type_a
= value_a
->type
;
707 type_b
= value_b
->type
;
709 if (type_a
->base_type
!= type_b
->base_type
) {
710 _mesa_glsl_error(loc
, state
, "base type mismatch");
711 return glsl_type::error_type
;
714 /* "The result is scalar Boolean."
716 return glsl_type::bool_type
;
720 * \brief Return the result type of a bit-shift operation.
722 * If the given types to the bit-shift operator are invalid, return
723 * glsl_type::error_type.
725 * \param type_a Type of LHS of bit-shift op
726 * \param type_b Type of RHS of bit-shift op
728 static const struct glsl_type
*
729 shift_result_type(const struct glsl_type
*type_a
,
730 const struct glsl_type
*type_b
,
732 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
734 if (!state
->check_bitwise_operations_allowed(loc
)) {
735 return glsl_type::error_type
;
738 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
740 * "The shift operators (<<) and (>>). For both operators, the operands
741 * must be signed or unsigned integers or integer vectors. One operand
742 * can be signed while the other is unsigned."
744 if (!type_a
->is_integer_32_64()) {
745 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
746 "integer vector", ast_expression::operator_string(op
));
747 return glsl_type::error_type
;
750 if (!type_b
->is_integer()) {
751 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
752 "integer vector", ast_expression::operator_string(op
));
753 return glsl_type::error_type
;
756 /* "If the first operand is a scalar, the second operand has to be
759 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
760 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
761 "second must be scalar as well",
762 ast_expression::operator_string(op
));
763 return glsl_type::error_type
;
766 /* If both operands are vectors, check that they have same number of
769 if (type_a
->is_vector() &&
770 type_b
->is_vector() &&
771 type_a
->vector_elements
!= type_b
->vector_elements
) {
772 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
773 "have same number of elements",
774 ast_expression::operator_string(op
));
775 return glsl_type::error_type
;
778 /* "In all cases, the resulting type will be the same type as the left
785 * Returns the innermost array index expression in an rvalue tree.
786 * This is the largest indexing level -- if an array of blocks, then
787 * it is the block index rather than an indexing expression for an
788 * array-typed member of an array of blocks.
791 find_innermost_array_index(ir_rvalue
*rv
)
793 ir_dereference_array
*last
= NULL
;
795 if (rv
->as_dereference_array()) {
796 last
= rv
->as_dereference_array();
798 } else if (rv
->as_dereference_record())
799 rv
= rv
->as_dereference_record()->record
;
800 else if (rv
->as_swizzle())
801 rv
= rv
->as_swizzle()->val
;
807 return last
->array_index
;
813 * Validates that a value can be assigned to a location with a specified type
815 * Validates that \c rhs can be assigned to some location. If the types are
816 * not an exact match but an automatic conversion is possible, \c rhs will be
820 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
821 * Otherwise the actual RHS to be assigned will be returned. This may be
822 * \c rhs, or it may be \c rhs after some type conversion.
825 * In addition to being used for assignments, this function is used to
826 * type-check return values.
829 validate_assignment(struct _mesa_glsl_parse_state
*state
,
830 YYLTYPE loc
, ir_rvalue
*lhs
,
831 ir_rvalue
*rhs
, bool is_initializer
)
833 /* If there is already some error in the RHS, just return it. Anything
834 * else will lead to an avalanche of error message back to the user.
836 if (rhs
->type
->is_error())
839 /* In the Tessellation Control Shader:
840 * If a per-vertex output variable is used as an l-value, it is an error
841 * if the expression indicating the vertex number is not the identifier
844 if (state
->stage
== MESA_SHADER_TESS_CTRL
&& !lhs
->type
->is_error()) {
845 ir_variable
*var
= lhs
->variable_referenced();
846 if (var
&& var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
847 ir_rvalue
*index
= find_innermost_array_index(lhs
);
848 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
849 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
850 _mesa_glsl_error(&loc
, state
,
851 "Tessellation control shader outputs can only "
852 "be indexed by gl_InvocationID");
858 /* If the types are identical, the assignment can trivially proceed.
860 if (rhs
->type
== lhs
->type
)
863 /* If the array element types are the same and the LHS is unsized,
864 * the assignment is okay for initializers embedded in variable
867 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
868 * is handled by ir_dereference::is_lvalue.
870 const glsl_type
*lhs_t
= lhs
->type
;
871 const glsl_type
*rhs_t
= rhs
->type
;
872 bool unsized_array
= false;
873 while(lhs_t
->is_array()) {
875 break; /* the rest of the inner arrays match so break out early */
876 if (!rhs_t
->is_array()) {
877 unsized_array
= false;
878 break; /* number of dimensions mismatch */
880 if (lhs_t
->length
== rhs_t
->length
) {
881 lhs_t
= lhs_t
->fields
.array
;
882 rhs_t
= rhs_t
->fields
.array
;
884 } else if (lhs_t
->is_unsized_array()) {
885 unsized_array
= true;
887 unsized_array
= false;
888 break; /* sized array mismatch */
890 lhs_t
= lhs_t
->fields
.array
;
891 rhs_t
= rhs_t
->fields
.array
;
894 if (is_initializer
) {
897 _mesa_glsl_error(&loc
, state
,
898 "implicitly sized arrays cannot be assigned");
903 /* Check for implicit conversion in GLSL 1.20 */
904 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
905 if (rhs
->type
== lhs
->type
)
909 _mesa_glsl_error(&loc
, state
,
910 "%s of type %s cannot be assigned to "
911 "variable of type %s",
912 is_initializer
? "initializer" : "value",
913 rhs
->type
->name
, lhs
->type
->name
);
919 mark_whole_array_access(ir_rvalue
*access
)
921 ir_dereference_variable
*deref
= access
->as_dereference_variable();
923 if (deref
&& deref
->var
) {
924 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
929 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
930 const char *non_lvalue_description
,
931 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
932 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
937 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
939 ir_variable
*lhs_var
= lhs
->variable_referenced();
941 lhs_var
->data
.assigned
= true;
943 if (!error_emitted
) {
944 if (non_lvalue_description
!= NULL
) {
945 _mesa_glsl_error(&lhs_loc
, state
,
947 non_lvalue_description
);
948 error_emitted
= true;
949 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
950 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
951 lhs_var
->data
.memory_read_only
))) {
952 /* We can have memory_read_only set on both images and buffer variables,
953 * but in the former there is a distinction between assignments to
954 * the variable itself (read_only) and to the memory they point to
955 * (memory_read_only), while in the case of buffer variables there is
956 * no such distinction, that is why this check here is limited to
957 * buffer variables alone.
959 _mesa_glsl_error(&lhs_loc
, state
,
960 "assignment to read-only variable '%s'",
962 error_emitted
= true;
963 } else if (lhs
->type
->is_array() &&
964 !state
->check_version(120, 300, &lhs_loc
,
965 "whole array assignment forbidden")) {
966 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
968 * "Other binary or unary expressions, non-dereferenced
969 * arrays, function names, swizzles with repeated fields,
970 * and constants cannot be l-values."
972 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
974 error_emitted
= true;
975 } else if (!lhs
->is_lvalue(state
)) {
976 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
977 error_emitted
= true;
982 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
983 if (new_rhs
!= NULL
) {
986 /* If the LHS array was not declared with a size, it takes it size from
987 * the RHS. If the LHS is an l-value and a whole array, it must be a
988 * dereference of a variable. Any other case would require that the LHS
989 * is either not an l-value or not a whole array.
991 if (lhs
->type
->is_unsized_array()) {
992 ir_dereference
*const d
= lhs
->as_dereference();
996 ir_variable
*const var
= d
->variable_referenced();
1000 if (var
->data
.max_array_access
>= rhs
->type
->array_size()) {
1001 /* FINISHME: This should actually log the location of the RHS. */
1002 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
1004 var
->data
.max_array_access
);
1007 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
1008 rhs
->type
->array_size());
1009 d
->type
= var
->type
;
1011 if (lhs
->type
->is_array()) {
1012 mark_whole_array_access(rhs
);
1013 mark_whole_array_access(lhs
);
1016 error_emitted
= true;
1019 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
1020 * but not post_inc) need the converted assigned value as an rvalue
1021 * to handle things like:
1027 if (!error_emitted
) {
1028 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1030 instructions
->push_tail(var
);
1031 instructions
->push_tail(assign(var
, rhs
));
1033 ir_dereference_variable
*deref_var
=
1034 new(ctx
) ir_dereference_variable(var
);
1035 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1036 rvalue
= new(ctx
) ir_dereference_variable(var
);
1038 rvalue
= ir_rvalue::error_value(ctx
);
1040 *out_rvalue
= rvalue
;
1043 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1047 return error_emitted
;
1051 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1053 void *ctx
= ralloc_parent(lvalue
);
1056 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1058 instructions
->push_tail(var
);
1060 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1063 return new(ctx
) ir_dereference_variable(var
);
1068 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1070 (void) instructions
;
1077 ast_node::has_sequence_subexpression() const
1083 ast_node::set_is_lhs(bool /* new_value */)
1088 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1089 struct _mesa_glsl_parse_state
*state
)
1091 (void)hir(instructions
, state
);
1095 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1096 struct _mesa_glsl_parse_state
*state
)
1098 (void)hir(instructions
, state
);
1102 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1105 ir_rvalue
*cmp
= NULL
;
1107 if (operation
== ir_binop_all_equal
)
1108 join_op
= ir_binop_logic_and
;
1110 join_op
= ir_binop_logic_or
;
1112 switch (op0
->type
->base_type
) {
1113 case GLSL_TYPE_FLOAT
:
1114 case GLSL_TYPE_FLOAT16
:
1115 case GLSL_TYPE_UINT
:
1117 case GLSL_TYPE_BOOL
:
1118 case GLSL_TYPE_DOUBLE
:
1119 case GLSL_TYPE_UINT64
:
1120 case GLSL_TYPE_INT64
:
1121 case GLSL_TYPE_UINT16
:
1122 case GLSL_TYPE_INT16
:
1123 case GLSL_TYPE_UINT8
:
1124 case GLSL_TYPE_INT8
:
1125 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1127 case GLSL_TYPE_ARRAY
: {
1128 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1129 ir_rvalue
*e0
, *e1
, *result
;
1131 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1132 new(mem_ctx
) ir_constant(i
));
1133 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1134 new(mem_ctx
) ir_constant(i
));
1135 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1138 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1144 mark_whole_array_access(op0
);
1145 mark_whole_array_access(op1
);
1149 case GLSL_TYPE_STRUCT
: {
1150 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1151 ir_rvalue
*e0
, *e1
, *result
;
1152 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1154 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1156 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1158 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1161 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1169 case GLSL_TYPE_ERROR
:
1170 case GLSL_TYPE_VOID
:
1171 case GLSL_TYPE_SAMPLER
:
1172 case GLSL_TYPE_IMAGE
:
1173 case GLSL_TYPE_INTERFACE
:
1174 case GLSL_TYPE_ATOMIC_UINT
:
1175 case GLSL_TYPE_SUBROUTINE
:
1176 case GLSL_TYPE_FUNCTION
:
1177 /* I assume a comparison of a struct containing a sampler just
1178 * ignores the sampler present in the type.
1184 cmp
= new(mem_ctx
) ir_constant(true);
1189 /* For logical operations, we want to ensure that the operands are
1190 * scalar booleans. If it isn't, emit an error and return a constant
1191 * boolean to avoid triggering cascading error messages.
1194 get_scalar_boolean_operand(exec_list
*instructions
,
1195 struct _mesa_glsl_parse_state
*state
,
1196 ast_expression
*parent_expr
,
1198 const char *operand_name
,
1199 bool *error_emitted
)
1201 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1203 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1205 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1208 if (!*error_emitted
) {
1209 YYLTYPE loc
= expr
->get_location();
1210 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1212 parent_expr
->operator_string(parent_expr
->oper
));
1213 *error_emitted
= true;
1216 return new(ctx
) ir_constant(true);
1220 * If name refers to a builtin array whose maximum allowed size is less than
1221 * size, report an error and return true. Otherwise return false.
1224 check_builtin_array_max_size(const char *name
, unsigned size
,
1225 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1227 if ((strcmp("gl_TexCoord", name
) == 0)
1228 && (size
> state
->Const
.MaxTextureCoords
)) {
1229 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1231 * "The size [of gl_TexCoord] can be at most
1232 * gl_MaxTextureCoords."
1234 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1235 "be larger than gl_MaxTextureCoords (%u)",
1236 state
->Const
.MaxTextureCoords
);
1237 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1238 state
->clip_dist_size
= size
;
1239 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1240 /* From section 7.1 (Vertex Shader Special Variables) of the
1243 * "The gl_ClipDistance array is predeclared as unsized and
1244 * must be sized by the shader either redeclaring it with a
1245 * size or indexing it only with integral constant
1246 * expressions. ... The size can be at most
1247 * gl_MaxClipDistances."
1249 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1250 "be larger than gl_MaxClipDistances (%u)",
1251 state
->Const
.MaxClipPlanes
);
1253 } else if (strcmp("gl_CullDistance", name
) == 0) {
1254 state
->cull_dist_size
= size
;
1255 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1256 /* From the ARB_cull_distance spec:
1258 * "The gl_CullDistance array is predeclared as unsized and
1259 * must be sized by the shader either redeclaring it with
1260 * a size or indexing it only with integral constant
1261 * expressions. The size determines the number and set of
1262 * enabled cull distances and can be at most
1263 * gl_MaxCullDistances."
1265 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1266 "be larger than gl_MaxCullDistances (%u)",
1267 state
->Const
.MaxClipPlanes
);
1273 * Create the constant 1, of a which is appropriate for incrementing and
1274 * decrementing values of the given GLSL type. For example, if type is vec4,
1275 * this creates a constant value of 1.0 having type float.
1277 * If the given type is invalid for increment and decrement operators, return
1278 * a floating point 1--the error will be detected later.
1281 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1283 switch (type
->base_type
) {
1284 case GLSL_TYPE_UINT
:
1285 return new(ctx
) ir_constant((unsigned) 1);
1287 return new(ctx
) ir_constant(1);
1288 case GLSL_TYPE_UINT64
:
1289 return new(ctx
) ir_constant((uint64_t) 1);
1290 case GLSL_TYPE_INT64
:
1291 return new(ctx
) ir_constant((int64_t) 1);
1293 case GLSL_TYPE_FLOAT
:
1294 return new(ctx
) ir_constant(1.0f
);
1299 ast_expression::hir(exec_list
*instructions
,
1300 struct _mesa_glsl_parse_state
*state
)
1302 return do_hir(instructions
, state
, true);
1306 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1307 struct _mesa_glsl_parse_state
*state
)
1309 do_hir(instructions
, state
, false);
1313 ast_expression::set_is_lhs(bool new_value
)
1315 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1316 * if we lack an identifier we can just skip it.
1318 if (this->primary_expression
.identifier
== NULL
)
1321 this->is_lhs
= new_value
;
1323 /* We need to go through the subexpressions tree to cover cases like
1324 * ast_field_selection
1326 if (this->subexpressions
[0] != NULL
)
1327 this->subexpressions
[0]->set_is_lhs(new_value
);
1331 ast_expression::do_hir(exec_list
*instructions
,
1332 struct _mesa_glsl_parse_state
*state
,
1336 static const int operations
[AST_NUM_OPERATORS
] = {
1337 -1, /* ast_assign doesn't convert to ir_expression. */
1338 -1, /* ast_plus doesn't convert to ir_expression. */
1348 ir_binop_less
, /* This is correct. See the ast_greater case below. */
1349 ir_binop_gequal
, /* This is correct. See the ast_lequal case below. */
1352 ir_binop_any_nequal
,
1362 /* Note: The following block of expression types actually convert
1363 * to multiple IR instructions.
1365 ir_binop_mul
, /* ast_mul_assign */
1366 ir_binop_div
, /* ast_div_assign */
1367 ir_binop_mod
, /* ast_mod_assign */
1368 ir_binop_add
, /* ast_add_assign */
1369 ir_binop_sub
, /* ast_sub_assign */
1370 ir_binop_lshift
, /* ast_ls_assign */
1371 ir_binop_rshift
, /* ast_rs_assign */
1372 ir_binop_bit_and
, /* ast_and_assign */
1373 ir_binop_bit_xor
, /* ast_xor_assign */
1374 ir_binop_bit_or
, /* ast_or_assign */
1376 -1, /* ast_conditional doesn't convert to ir_expression. */
1377 ir_binop_add
, /* ast_pre_inc. */
1378 ir_binop_sub
, /* ast_pre_dec. */
1379 ir_binop_add
, /* ast_post_inc. */
1380 ir_binop_sub
, /* ast_post_dec. */
1381 -1, /* ast_field_selection doesn't conv to ir_expression. */
1382 -1, /* ast_array_index doesn't convert to ir_expression. */
1383 -1, /* ast_function_call doesn't conv to ir_expression. */
1384 -1, /* ast_identifier doesn't convert to ir_expression. */
1385 -1, /* ast_int_constant doesn't convert to ir_expression. */
1386 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1387 -1, /* ast_float_constant doesn't conv to ir_expression. */
1388 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1389 -1, /* ast_sequence doesn't convert to ir_expression. */
1390 -1, /* ast_aggregate shouldn't ever even get here. */
1392 ir_rvalue
*result
= NULL
;
1394 const struct glsl_type
*type
, *orig_type
;
1395 bool error_emitted
= false;
1398 loc
= this->get_location();
1400 switch (this->oper
) {
1402 unreachable("ast_aggregate: Should never get here.");
1405 this->subexpressions
[0]->set_is_lhs(true);
1406 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1407 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1410 do_assignment(instructions
, state
,
1411 this->subexpressions
[0]->non_lvalue_description
,
1412 op
[0], op
[1], &result
, needs_rvalue
, false,
1413 this->subexpressions
[0]->get_location());
1418 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1420 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1422 error_emitted
= type
->is_error();
1428 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1430 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1432 error_emitted
= type
->is_error();
1434 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1442 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1443 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1445 type
= arithmetic_result_type(op
[0], op
[1],
1446 (this->oper
== ast_mul
),
1448 error_emitted
= type
->is_error();
1450 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1455 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1456 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1458 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1460 assert(operations
[this->oper
] == ir_binop_mod
);
1462 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1464 error_emitted
= type
->is_error();
1469 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1470 error_emitted
= true;
1473 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1474 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1475 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1477 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1479 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1486 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1487 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1489 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1491 /* The relational operators must either generate an error or result
1492 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1494 assert(type
->is_error()
1495 || (type
->is_boolean() && type
->is_scalar()));
1497 /* Like NIR, GLSL IR does not have opcodes for > or <=. Instead, swap
1498 * the arguments and use < or >=.
1500 if (this->oper
== ast_greater
|| this->oper
== ast_lequal
) {
1501 ir_rvalue
*const tmp
= op
[0];
1506 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1508 error_emitted
= type
->is_error();
1513 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1514 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1516 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1518 * "The equality operators equal (==), and not equal (!=)
1519 * operate on all types. They result in a scalar Boolean. If
1520 * the operand types do not match, then there must be a
1521 * conversion from Section 4.1.10 "Implicit Conversions"
1522 * applied to one operand that can make them match, in which
1523 * case this conversion is done."
1526 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1527 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1528 "no operation `%1$s' exists that takes a left-hand "
1529 "operand of type 'void' or a right operand of type "
1530 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1531 error_emitted
= true;
1532 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1533 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1534 || (op
[0]->type
!= op
[1]->type
)) {
1535 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1536 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1537 error_emitted
= true;
1538 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1539 !state
->check_version(120, 300, &loc
,
1540 "array comparisons forbidden")) {
1541 error_emitted
= true;
1542 } else if ((op
[0]->type
->contains_subroutine() ||
1543 op
[1]->type
->contains_subroutine())) {
1544 _mesa_glsl_error(&loc
, state
, "subroutine comparisons forbidden");
1545 error_emitted
= true;
1546 } else if ((op
[0]->type
->contains_opaque() ||
1547 op
[1]->type
->contains_opaque())) {
1548 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1549 error_emitted
= true;
1552 if (error_emitted
) {
1553 result
= new(ctx
) ir_constant(false);
1555 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1556 assert(result
->type
== glsl_type::bool_type
);
1563 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1564 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1565 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1566 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1568 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1572 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1574 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1575 error_emitted
= true;
1578 if (!op
[0]->type
->is_integer_32_64()) {
1579 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1580 error_emitted
= true;
1583 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1584 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1587 case ast_logic_and
: {
1588 exec_list rhs_instructions
;
1589 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1590 "LHS", &error_emitted
);
1591 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1592 "RHS", &error_emitted
);
1594 if (rhs_instructions
.is_empty()) {
1595 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1597 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1600 instructions
->push_tail(tmp
);
1602 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1603 instructions
->push_tail(stmt
);
1605 stmt
->then_instructions
.append_list(&rhs_instructions
);
1606 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1607 ir_assignment
*const then_assign
=
1608 new(ctx
) ir_assignment(then_deref
, op
[1]);
1609 stmt
->then_instructions
.push_tail(then_assign
);
1611 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1612 ir_assignment
*const else_assign
=
1613 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1614 stmt
->else_instructions
.push_tail(else_assign
);
1616 result
= new(ctx
) ir_dereference_variable(tmp
);
1621 case ast_logic_or
: {
1622 exec_list rhs_instructions
;
1623 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1624 "LHS", &error_emitted
);
1625 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1626 "RHS", &error_emitted
);
1628 if (rhs_instructions
.is_empty()) {
1629 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1631 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1634 instructions
->push_tail(tmp
);
1636 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1637 instructions
->push_tail(stmt
);
1639 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1640 ir_assignment
*const then_assign
=
1641 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1642 stmt
->then_instructions
.push_tail(then_assign
);
1644 stmt
->else_instructions
.append_list(&rhs_instructions
);
1645 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1646 ir_assignment
*const else_assign
=
1647 new(ctx
) ir_assignment(else_deref
, op
[1]);
1648 stmt
->else_instructions
.push_tail(else_assign
);
1650 result
= new(ctx
) ir_dereference_variable(tmp
);
1656 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1658 * "The logical binary operators and (&&), or ( | | ), and
1659 * exclusive or (^^). They operate only on two Boolean
1660 * expressions and result in a Boolean expression."
1662 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1664 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1667 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1672 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1673 "operand", &error_emitted
);
1675 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1679 case ast_mul_assign
:
1680 case ast_div_assign
:
1681 case ast_add_assign
:
1682 case ast_sub_assign
: {
1683 this->subexpressions
[0]->set_is_lhs(true);
1684 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1685 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1687 orig_type
= op
[0]->type
;
1688 type
= arithmetic_result_type(op
[0], op
[1],
1689 (this->oper
== ast_mul_assign
),
1692 if (type
!= orig_type
) {
1693 _mesa_glsl_error(& loc
, state
,
1694 "could not implicitly convert "
1695 "%s to %s", type
->name
, orig_type
->name
);
1696 type
= glsl_type::error_type
;
1699 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1703 do_assignment(instructions
, state
,
1704 this->subexpressions
[0]->non_lvalue_description
,
1705 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1706 &result
, needs_rvalue
, false,
1707 this->subexpressions
[0]->get_location());
1709 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1710 * explicitly test for this because none of the binary expression
1711 * operators allow array operands either.
1717 case ast_mod_assign
: {
1718 this->subexpressions
[0]->set_is_lhs(true);
1719 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1720 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1722 orig_type
= op
[0]->type
;
1723 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1725 if (type
!= orig_type
) {
1726 _mesa_glsl_error(& loc
, state
,
1727 "could not implicitly convert "
1728 "%s to %s", type
->name
, orig_type
->name
);
1729 type
= glsl_type::error_type
;
1732 assert(operations
[this->oper
] == ir_binop_mod
);
1734 ir_rvalue
*temp_rhs
;
1735 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1739 do_assignment(instructions
, state
,
1740 this->subexpressions
[0]->non_lvalue_description
,
1741 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1742 &result
, needs_rvalue
, false,
1743 this->subexpressions
[0]->get_location());
1748 case ast_rs_assign
: {
1749 this->subexpressions
[0]->set_is_lhs(true);
1750 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1751 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1752 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1754 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1755 type
, op
[0], op
[1]);
1757 do_assignment(instructions
, state
,
1758 this->subexpressions
[0]->non_lvalue_description
,
1759 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1760 &result
, needs_rvalue
, false,
1761 this->subexpressions
[0]->get_location());
1765 case ast_and_assign
:
1766 case ast_xor_assign
:
1767 case ast_or_assign
: {
1768 this->subexpressions
[0]->set_is_lhs(true);
1769 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1770 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1772 orig_type
= op
[0]->type
;
1773 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1775 if (type
!= orig_type
) {
1776 _mesa_glsl_error(& loc
, state
,
1777 "could not implicitly convert "
1778 "%s to %s", type
->name
, orig_type
->name
);
1779 type
= glsl_type::error_type
;
1782 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1783 type
, op
[0], op
[1]);
1785 do_assignment(instructions
, state
,
1786 this->subexpressions
[0]->non_lvalue_description
,
1787 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1788 &result
, needs_rvalue
, false,
1789 this->subexpressions
[0]->get_location());
1793 case ast_conditional
: {
1794 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1796 * "The ternary selection operator (?:). It operates on three
1797 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1798 * first expression, which must result in a scalar Boolean."
1800 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1801 "condition", &error_emitted
);
1803 /* The :? operator is implemented by generating an anonymous temporary
1804 * followed by an if-statement. The last instruction in each branch of
1805 * the if-statement assigns a value to the anonymous temporary. This
1806 * temporary is the r-value of the expression.
1808 exec_list then_instructions
;
1809 exec_list else_instructions
;
1811 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1812 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1814 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1816 * "The second and third expressions can be any type, as
1817 * long their types match, or there is a conversion in
1818 * Section 4.1.10 "Implicit Conversions" that can be applied
1819 * to one of the expressions to make their types match. This
1820 * resulting matching type is the type of the entire
1823 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1824 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1825 || (op
[1]->type
!= op
[2]->type
)) {
1826 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1828 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1829 "operator must have matching types");
1830 error_emitted
= true;
1831 type
= glsl_type::error_type
;
1836 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1838 * "The second and third expressions must be the same type, but can
1839 * be of any type other than an array."
1841 if (type
->is_array() &&
1842 !state
->check_version(120, 300, &loc
,
1843 "second and third operands of ?: operator "
1844 "cannot be arrays")) {
1845 error_emitted
= true;
1848 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1850 * "Except for array indexing, structure member selection, and
1851 * parentheses, opaque variables are not allowed to be operands in
1852 * expressions; such use results in a compile-time error."
1854 if (type
->contains_opaque()) {
1855 if (!(state
->has_bindless() && (type
->is_image() || type
->is_sampler()))) {
1856 _mesa_glsl_error(&loc
, state
, "variables of type %s cannot be "
1857 "operands of the ?: operator", type
->name
);
1858 error_emitted
= true;
1862 ir_constant
*cond_val
= op
[0]->constant_expression_value(ctx
);
1864 if (then_instructions
.is_empty()
1865 && else_instructions
.is_empty()
1866 && cond_val
!= NULL
) {
1867 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1869 /* The copy to conditional_tmp reads the whole array. */
1870 if (type
->is_array()) {
1871 mark_whole_array_access(op
[1]);
1872 mark_whole_array_access(op
[2]);
1875 ir_variable
*const tmp
=
1876 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1877 instructions
->push_tail(tmp
);
1879 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1880 instructions
->push_tail(stmt
);
1882 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1883 ir_dereference
*const then_deref
=
1884 new(ctx
) ir_dereference_variable(tmp
);
1885 ir_assignment
*const then_assign
=
1886 new(ctx
) ir_assignment(then_deref
, op
[1]);
1887 stmt
->then_instructions
.push_tail(then_assign
);
1889 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1890 ir_dereference
*const else_deref
=
1891 new(ctx
) ir_dereference_variable(tmp
);
1892 ir_assignment
*const else_assign
=
1893 new(ctx
) ir_assignment(else_deref
, op
[2]);
1894 stmt
->else_instructions
.push_tail(else_assign
);
1896 result
= new(ctx
) ir_dereference_variable(tmp
);
1903 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1904 ? "pre-increment operation" : "pre-decrement operation";
1906 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1907 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1909 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1911 ir_rvalue
*temp_rhs
;
1912 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1916 do_assignment(instructions
, state
,
1917 this->subexpressions
[0]->non_lvalue_description
,
1918 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1919 &result
, needs_rvalue
, false,
1920 this->subexpressions
[0]->get_location());
1925 case ast_post_dec
: {
1926 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1927 ? "post-increment operation" : "post-decrement operation";
1928 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1929 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1931 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1933 if (error_emitted
) {
1934 result
= ir_rvalue::error_value(ctx
);
1938 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1940 ir_rvalue
*temp_rhs
;
1941 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1944 /* Get a temporary of a copy of the lvalue before it's modified.
1945 * This may get thrown away later.
1947 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1949 ir_rvalue
*junk_rvalue
;
1951 do_assignment(instructions
, state
,
1952 this->subexpressions
[0]->non_lvalue_description
,
1953 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1954 &junk_rvalue
, false, false,
1955 this->subexpressions
[0]->get_location());
1960 case ast_field_selection
:
1961 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1964 case ast_array_index
: {
1965 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1967 /* Getting if an array is being used uninitialized is beyond what we get
1968 * from ir_value.data.assigned. Setting is_lhs as true would force to
1969 * not raise a uninitialized warning when using an array
1971 subexpressions
[0]->set_is_lhs(true);
1972 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1973 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1975 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1978 if (result
->type
->is_error())
1979 error_emitted
= true;
1984 case ast_unsized_array_dim
:
1985 unreachable("ast_unsized_array_dim: Should never get here.");
1987 case ast_function_call
:
1988 /* Should *NEVER* get here. ast_function_call should always be handled
1989 * by ast_function_expression::hir.
1991 unreachable("ast_function_call: handled elsewhere ");
1993 case ast_identifier
: {
1994 /* ast_identifier can appear several places in a full abstract syntax
1995 * tree. This particular use must be at location specified in the grammar
1996 * as 'variable_identifier'.
1999 state
->symbols
->get_variable(this->primary_expression
.identifier
);
2002 /* the identifier might be a subroutine name */
2004 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
2005 var
= state
->symbols
->get_variable(sub_name
);
2006 ralloc_free(sub_name
);
2010 var
->data
.used
= true;
2011 result
= new(ctx
) ir_dereference_variable(var
);
2013 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
2015 && result
->variable_referenced()->data
.assigned
!= true
2016 && !is_gl_identifier(var
->name
)) {
2017 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
2018 this->primary_expression
.identifier
);
2021 /* From the EXT_shader_framebuffer_fetch spec:
2023 * "Unless the GL_EXT_shader_framebuffer_fetch extension has been
2024 * enabled in addition, it's an error to use gl_LastFragData if it
2025 * hasn't been explicitly redeclared with layout(noncoherent)."
2027 if (var
->data
.fb_fetch_output
&& var
->data
.memory_coherent
&&
2028 !state
->EXT_shader_framebuffer_fetch_enable
) {
2029 _mesa_glsl_error(&loc
, state
,
2030 "invalid use of framebuffer fetch output not "
2031 "qualified with layout(noncoherent)");
2035 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
2036 this->primary_expression
.identifier
);
2038 result
= ir_rvalue::error_value(ctx
);
2039 error_emitted
= true;
2044 case ast_int_constant
:
2045 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
2048 case ast_uint_constant
:
2049 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
2052 case ast_float_constant
:
2053 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
2056 case ast_bool_constant
:
2057 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
2060 case ast_double_constant
:
2061 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
2064 case ast_uint64_constant
:
2065 result
= new(ctx
) ir_constant(this->primary_expression
.uint64_constant
);
2068 case ast_int64_constant
:
2069 result
= new(ctx
) ir_constant(this->primary_expression
.int64_constant
);
2072 case ast_sequence
: {
2073 /* It should not be possible to generate a sequence in the AST without
2074 * any expressions in it.
2076 assert(!this->expressions
.is_empty());
2078 /* The r-value of a sequence is the last expression in the sequence. If
2079 * the other expressions in the sequence do not have side-effects (and
2080 * therefore add instructions to the instruction list), they get dropped
2083 exec_node
*previous_tail
= NULL
;
2084 YYLTYPE previous_operand_loc
= loc
;
2086 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
2087 /* If one of the operands of comma operator does not generate any
2088 * code, we want to emit a warning. At each pass through the loop
2089 * previous_tail will point to the last instruction in the stream
2090 * *before* processing the previous operand. Naturally,
2091 * instructions->get_tail_raw() will point to the last instruction in
2092 * the stream *after* processing the previous operand. If the two
2093 * pointers match, then the previous operand had no effect.
2095 * The warning behavior here differs slightly from GCC. GCC will
2096 * only emit a warning if none of the left-hand operands have an
2097 * effect. However, it will emit a warning for each. I believe that
2098 * there are some cases in C (especially with GCC extensions) where
2099 * it is useful to have an intermediate step in a sequence have no
2100 * effect, but I don't think these cases exist in GLSL. Either way,
2101 * it would be a giant hassle to replicate that behavior.
2103 if (previous_tail
== instructions
->get_tail_raw()) {
2104 _mesa_glsl_warning(&previous_operand_loc
, state
,
2105 "left-hand operand of comma expression has "
2109 /* The tail is directly accessed instead of using the get_tail()
2110 * method for performance reasons. get_tail() has extra code to
2111 * return NULL when the list is empty. We don't care about that
2112 * here, so using get_tail_raw() is fine.
2114 previous_tail
= instructions
->get_tail_raw();
2115 previous_operand_loc
= ast
->get_location();
2117 result
= ast
->hir(instructions
, state
);
2120 /* Any errors should have already been emitted in the loop above.
2122 error_emitted
= true;
2126 type
= NULL
; /* use result->type, not type. */
2127 assert(result
!= NULL
|| !needs_rvalue
);
2129 if (result
&& result
->type
->is_error() && !error_emitted
)
2130 _mesa_glsl_error(& loc
, state
, "type mismatch");
2136 ast_expression::has_sequence_subexpression() const
2138 switch (this->oper
) {
2147 return this->subexpressions
[0]->has_sequence_subexpression();
2169 case ast_array_index
:
2170 case ast_mul_assign
:
2171 case ast_div_assign
:
2172 case ast_add_assign
:
2173 case ast_sub_assign
:
2174 case ast_mod_assign
:
2177 case ast_and_assign
:
2178 case ast_xor_assign
:
2180 return this->subexpressions
[0]->has_sequence_subexpression() ||
2181 this->subexpressions
[1]->has_sequence_subexpression();
2183 case ast_conditional
:
2184 return this->subexpressions
[0]->has_sequence_subexpression() ||
2185 this->subexpressions
[1]->has_sequence_subexpression() ||
2186 this->subexpressions
[2]->has_sequence_subexpression();
2191 case ast_field_selection
:
2192 case ast_identifier
:
2193 case ast_int_constant
:
2194 case ast_uint_constant
:
2195 case ast_float_constant
:
2196 case ast_bool_constant
:
2197 case ast_double_constant
:
2198 case ast_int64_constant
:
2199 case ast_uint64_constant
:
2205 case ast_function_call
:
2206 unreachable("should be handled by ast_function_expression::hir");
2208 case ast_unsized_array_dim
:
2209 unreachable("ast_unsized_array_dim: Should never get here.");
2216 ast_expression_statement::hir(exec_list
*instructions
,
2217 struct _mesa_glsl_parse_state
*state
)
2219 /* It is possible to have expression statements that don't have an
2220 * expression. This is the solitary semicolon:
2222 * for (i = 0; i < 5; i++)
2225 * In this case the expression will be NULL. Test for NULL and don't do
2226 * anything in that case.
2228 if (expression
!= NULL
)
2229 expression
->hir_no_rvalue(instructions
, state
);
2231 /* Statements do not have r-values.
2238 ast_compound_statement::hir(exec_list
*instructions
,
2239 struct _mesa_glsl_parse_state
*state
)
2242 state
->symbols
->push_scope();
2244 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2245 ast
->hir(instructions
, state
);
2248 state
->symbols
->pop_scope();
2250 /* Compound statements do not have r-values.
2256 * Evaluate the given exec_node (which should be an ast_node representing
2257 * a single array dimension) and return its integer value.
2260 process_array_size(exec_node
*node
,
2261 struct _mesa_glsl_parse_state
*state
)
2263 void *mem_ctx
= state
;
2265 exec_list dummy_instructions
;
2267 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2270 * Dimensions other than the outermost dimension can by unsized if they
2271 * are immediately sized by a constructor or initializer.
2273 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2276 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2277 YYLTYPE loc
= array_size
->get_location();
2280 _mesa_glsl_error(& loc
, state
,
2281 "array size could not be resolved");
2285 if (!ir
->type
->is_integer()) {
2286 _mesa_glsl_error(& loc
, state
,
2287 "array size must be integer type");
2291 if (!ir
->type
->is_scalar()) {
2292 _mesa_glsl_error(& loc
, state
,
2293 "array size must be scalar type");
2297 ir_constant
*const size
= ir
->constant_expression_value(mem_ctx
);
2299 (state
->is_version(120, 300) &&
2300 array_size
->has_sequence_subexpression())) {
2301 _mesa_glsl_error(& loc
, state
, "array size must be a "
2302 "constant valued expression");
2306 if (size
->value
.i
[0] <= 0) {
2307 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2311 assert(size
->type
== ir
->type
);
2313 /* If the array size is const (and we've verified that
2314 * it is) then no instructions should have been emitted
2315 * when we converted it to HIR. If they were emitted,
2316 * then either the array size isn't const after all, or
2317 * we are emitting unnecessary instructions.
2319 assert(dummy_instructions
.is_empty());
2321 return size
->value
.u
[0];
2324 static const glsl_type
*
2325 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2326 ast_array_specifier
*array_specifier
,
2327 struct _mesa_glsl_parse_state
*state
)
2329 const glsl_type
*array_type
= base
;
2331 if (array_specifier
!= NULL
) {
2332 if (base
->is_array()) {
2334 /* From page 19 (page 25) of the GLSL 1.20 spec:
2336 * "Only one-dimensional arrays may be declared."
2338 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2339 return glsl_type::error_type
;
2343 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2344 !node
->is_head_sentinel(); node
= node
->prev
) {
2345 unsigned array_size
= process_array_size(node
, state
);
2346 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2354 precision_qualifier_allowed(const glsl_type
*type
)
2356 /* Precision qualifiers apply to floating point, integer and opaque
2359 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2360 * "Any floating point or any integer declaration can have the type
2361 * preceded by one of these precision qualifiers [...] Literal
2362 * constants do not have precision qualifiers. Neither do Boolean
2365 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2368 * "Precision qualifiers are added for code portability with OpenGL
2369 * ES, not for functionality. They have the same syntax as in OpenGL
2372 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2374 * "uniform lowp sampler2D sampler;
2377 * lowp vec4 col = texture2D (sampler, coord);
2378 * // texture2D returns lowp"
2380 * From this, we infer that GLSL 1.30 (and later) should allow precision
2381 * qualifiers on sampler types just like float and integer types.
2383 const glsl_type
*const t
= type
->without_array();
2385 return (t
->is_float() || t
->is_integer() || t
->contains_opaque()) &&
2390 ast_type_specifier::glsl_type(const char **name
,
2391 struct _mesa_glsl_parse_state
*state
) const
2393 const struct glsl_type
*type
;
2395 if (this->type
!= NULL
)
2398 type
= structure
->type
;
2400 type
= state
->symbols
->get_type(this->type_name
);
2401 *name
= this->type_name
;
2403 YYLTYPE loc
= this->get_location();
2404 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2410 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2412 * "The precision statement
2414 * precision precision-qualifier type;
2416 * can be used to establish a default precision qualifier. The type field can
2417 * be either int or float or any of the sampler types, (...) If type is float,
2418 * the directive applies to non-precision-qualified floating point type
2419 * (scalar, vector, and matrix) declarations. If type is int, the directive
2420 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2421 * and unsigned) declarations."
2423 * We use the symbol table to keep the values of the default precisions for
2424 * each 'type' in each scope and we use the 'type' string from the precision
2425 * statement as key in the symbol table. When we want to retrieve the default
2426 * precision associated with a given glsl_type we need to know the type string
2427 * associated with it. This is what this function returns.
2430 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2432 switch (type
->base_type
) {
2433 case GLSL_TYPE_FLOAT
:
2435 case GLSL_TYPE_UINT
:
2438 case GLSL_TYPE_ATOMIC_UINT
:
2439 return "atomic_uint";
2440 case GLSL_TYPE_IMAGE
:
2442 case GLSL_TYPE_SAMPLER
: {
2443 const unsigned type_idx
=
2444 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2445 const unsigned offset
= type
->is_sampler() ? 0 : 4;
2446 assert(type_idx
< 4);
2447 switch (type
->sampled_type
) {
2448 case GLSL_TYPE_FLOAT
:
2449 switch (type
->sampler_dimensionality
) {
2450 case GLSL_SAMPLER_DIM_1D
: {
2451 assert(type
->is_sampler());
2452 static const char *const names
[4] = {
2453 "sampler1D", "sampler1DArray",
2454 "sampler1DShadow", "sampler1DArrayShadow"
2456 return names
[type_idx
];
2458 case GLSL_SAMPLER_DIM_2D
: {
2459 static const char *const names
[8] = {
2460 "sampler2D", "sampler2DArray",
2461 "sampler2DShadow", "sampler2DArrayShadow",
2462 "image2D", "image2DArray", NULL
, NULL
2464 return names
[offset
+ type_idx
];
2466 case GLSL_SAMPLER_DIM_3D
: {
2467 static const char *const names
[8] = {
2468 "sampler3D", NULL
, NULL
, NULL
,
2469 "image3D", NULL
, NULL
, NULL
2471 return names
[offset
+ type_idx
];
2473 case GLSL_SAMPLER_DIM_CUBE
: {
2474 static const char *const names
[8] = {
2475 "samplerCube", "samplerCubeArray",
2476 "samplerCubeShadow", "samplerCubeArrayShadow",
2477 "imageCube", NULL
, NULL
, NULL
2479 return names
[offset
+ type_idx
];
2481 case GLSL_SAMPLER_DIM_MS
: {
2482 assert(type
->is_sampler());
2483 static const char *const names
[4] = {
2484 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2486 return names
[type_idx
];
2488 case GLSL_SAMPLER_DIM_RECT
: {
2489 assert(type
->is_sampler());
2490 static const char *const names
[4] = {
2491 "samplerRect", NULL
, "samplerRectShadow", NULL
2493 return names
[type_idx
];
2495 case GLSL_SAMPLER_DIM_BUF
: {
2496 static const char *const names
[8] = {
2497 "samplerBuffer", NULL
, NULL
, NULL
,
2498 "imageBuffer", NULL
, NULL
, NULL
2500 return names
[offset
+ type_idx
];
2502 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2503 assert(type
->is_sampler());
2504 static const char *const names
[4] = {
2505 "samplerExternalOES", NULL
, NULL
, NULL
2507 return names
[type_idx
];
2510 unreachable("Unsupported sampler/image dimensionality");
2511 } /* sampler/image float dimensionality */
2514 switch (type
->sampler_dimensionality
) {
2515 case GLSL_SAMPLER_DIM_1D
: {
2516 assert(type
->is_sampler());
2517 static const char *const names
[4] = {
2518 "isampler1D", "isampler1DArray", NULL
, NULL
2520 return names
[type_idx
];
2522 case GLSL_SAMPLER_DIM_2D
: {
2523 static const char *const names
[8] = {
2524 "isampler2D", "isampler2DArray", NULL
, NULL
,
2525 "iimage2D", "iimage2DArray", NULL
, NULL
2527 return names
[offset
+ type_idx
];
2529 case GLSL_SAMPLER_DIM_3D
: {
2530 static const char *const names
[8] = {
2531 "isampler3D", NULL
, NULL
, NULL
,
2532 "iimage3D", NULL
, NULL
, NULL
2534 return names
[offset
+ type_idx
];
2536 case GLSL_SAMPLER_DIM_CUBE
: {
2537 static const char *const names
[8] = {
2538 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2539 "iimageCube", NULL
, NULL
, NULL
2541 return names
[offset
+ type_idx
];
2543 case GLSL_SAMPLER_DIM_MS
: {
2544 assert(type
->is_sampler());
2545 static const char *const names
[4] = {
2546 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2548 return names
[type_idx
];
2550 case GLSL_SAMPLER_DIM_RECT
: {
2551 assert(type
->is_sampler());
2552 static const char *const names
[4] = {
2553 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2555 return names
[type_idx
];
2557 case GLSL_SAMPLER_DIM_BUF
: {
2558 static const char *const names
[8] = {
2559 "isamplerBuffer", NULL
, NULL
, NULL
,
2560 "iimageBuffer", NULL
, NULL
, NULL
2562 return names
[offset
+ type_idx
];
2565 unreachable("Unsupported isampler/iimage dimensionality");
2566 } /* sampler/image int dimensionality */
2568 case GLSL_TYPE_UINT
:
2569 switch (type
->sampler_dimensionality
) {
2570 case GLSL_SAMPLER_DIM_1D
: {
2571 assert(type
->is_sampler());
2572 static const char *const names
[4] = {
2573 "usampler1D", "usampler1DArray", NULL
, NULL
2575 return names
[type_idx
];
2577 case GLSL_SAMPLER_DIM_2D
: {
2578 static const char *const names
[8] = {
2579 "usampler2D", "usampler2DArray", NULL
, NULL
,
2580 "uimage2D", "uimage2DArray", NULL
, NULL
2582 return names
[offset
+ type_idx
];
2584 case GLSL_SAMPLER_DIM_3D
: {
2585 static const char *const names
[8] = {
2586 "usampler3D", NULL
, NULL
, NULL
,
2587 "uimage3D", NULL
, NULL
, NULL
2589 return names
[offset
+ type_idx
];
2591 case GLSL_SAMPLER_DIM_CUBE
: {
2592 static const char *const names
[8] = {
2593 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2594 "uimageCube", NULL
, NULL
, NULL
2596 return names
[offset
+ type_idx
];
2598 case GLSL_SAMPLER_DIM_MS
: {
2599 assert(type
->is_sampler());
2600 static const char *const names
[4] = {
2601 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2603 return names
[type_idx
];
2605 case GLSL_SAMPLER_DIM_RECT
: {
2606 assert(type
->is_sampler());
2607 static const char *const names
[4] = {
2608 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2610 return names
[type_idx
];
2612 case GLSL_SAMPLER_DIM_BUF
: {
2613 static const char *const names
[8] = {
2614 "usamplerBuffer", NULL
, NULL
, NULL
,
2615 "uimageBuffer", NULL
, NULL
, NULL
2617 return names
[offset
+ type_idx
];
2620 unreachable("Unsupported usampler/uimage dimensionality");
2621 } /* sampler/image uint dimensionality */
2624 unreachable("Unsupported sampler/image type");
2625 } /* sampler/image type */
2627 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2630 unreachable("Unsupported type");
2635 select_gles_precision(unsigned qual_precision
,
2636 const glsl_type
*type
,
2637 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2639 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2640 * In GLES we take the precision from the type qualifier if present,
2641 * otherwise, if the type of the variable allows precision qualifiers at
2642 * all, we look for the default precision qualifier for that type in the
2645 assert(state
->es_shader
);
2647 unsigned precision
= GLSL_PRECISION_NONE
;
2648 if (qual_precision
) {
2649 precision
= qual_precision
;
2650 } else if (precision_qualifier_allowed(type
)) {
2651 const char *type_name
=
2652 get_type_name_for_precision_qualifier(type
->without_array());
2653 assert(type_name
!= NULL
);
2656 state
->symbols
->get_default_precision_qualifier(type_name
);
2657 if (precision
== ast_precision_none
) {
2658 _mesa_glsl_error(loc
, state
,
2659 "No precision specified in this scope for type `%s'",
2665 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
2667 * "The default precision of all atomic types is highp. It is an error to
2668 * declare an atomic type with a different precision or to specify the
2669 * default precision for an atomic type to be lowp or mediump."
2671 if (type
->is_atomic_uint() && precision
!= ast_precision_high
) {
2672 _mesa_glsl_error(loc
, state
,
2673 "atomic_uint can only have highp precision qualifier");
2680 ast_fully_specified_type::glsl_type(const char **name
,
2681 struct _mesa_glsl_parse_state
*state
) const
2683 return this->specifier
->glsl_type(name
, state
);
2687 * Determine whether a toplevel variable declaration declares a varying. This
2688 * function operates by examining the variable's mode and the shader target,
2689 * so it correctly identifies linkage variables regardless of whether they are
2690 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2692 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2693 * this function will produce undefined results.
2696 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2699 case MESA_SHADER_VERTEX
:
2700 return var
->data
.mode
== ir_var_shader_out
;
2701 case MESA_SHADER_FRAGMENT
:
2702 return var
->data
.mode
== ir_var_shader_in
;
2704 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2709 is_allowed_invariant(ir_variable
*var
, struct _mesa_glsl_parse_state
*state
)
2711 if (is_varying_var(var
, state
->stage
))
2714 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec:
2715 * "Only variables output from a vertex shader can be candidates
2718 if (!state
->is_version(130, 0))
2722 * Later specs remove this language - so allowed invariant
2723 * on fragment shader outputs as well.
2725 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
2726 var
->data
.mode
== ir_var_shader_out
)
2732 * Matrix layout qualifiers are only allowed on certain types
2735 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2737 const glsl_type
*type
,
2740 if (var
&& !var
->is_in_buffer_block()) {
2741 /* Layout qualifiers may only apply to interface blocks and fields in
2744 _mesa_glsl_error(loc
, state
,
2745 "uniform block layout qualifiers row_major and "
2746 "column_major may not be applied to variables "
2747 "outside of uniform blocks");
2748 } else if (!type
->without_array()->is_matrix()) {
2749 /* The OpenGL ES 3.0 conformance tests did not originally allow
2750 * matrix layout qualifiers on non-matrices. However, the OpenGL
2751 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2752 * amended to specifically allow these layouts on all types. Emit
2753 * a warning so that people know their code may not be portable.
2755 _mesa_glsl_warning(loc
, state
,
2756 "uniform block layout qualifiers row_major and "
2757 "column_major applied to non-matrix types may "
2758 "be rejected by older compilers");
2763 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2764 struct _mesa_glsl_parse_state
*state
,
2765 unsigned xfb_buffer
) {
2766 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2767 _mesa_glsl_error(loc
, state
,
2768 "invalid xfb_buffer specified %d is larger than "
2769 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2771 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2778 /* From the ARB_enhanced_layouts spec:
2780 * "Variables and block members qualified with *xfb_offset* can be
2781 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2782 * The offset must be a multiple of the size of the first component of
2783 * the first qualified variable or block member, or a compile-time error
2784 * results. Further, if applied to an aggregate containing a double,
2785 * the offset must also be a multiple of 8, and the space taken in the
2786 * buffer will be a multiple of 8.
2789 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2790 struct _mesa_glsl_parse_state
*state
,
2791 int xfb_offset
, const glsl_type
*type
,
2792 unsigned component_size
) {
2793 const glsl_type
*t_without_array
= type
->without_array();
2795 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2796 _mesa_glsl_error(loc
, state
,
2797 "xfb_offset can't be used with unsized arrays.");
2801 /* Make sure nested structs don't contain unsized arrays, and validate
2802 * any xfb_offsets on interface members.
2804 if (t_without_array
->is_record() || t_without_array
->is_interface())
2805 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2806 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2808 /* When the interface block doesn't have an xfb_offset qualifier then
2809 * we apply the component size rules at the member level.
2811 if (xfb_offset
== -1)
2812 component_size
= member_t
->contains_double() ? 8 : 4;
2814 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2815 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2819 /* Nested structs or interface block without offset may not have had an
2820 * offset applied yet so return.
2822 if (xfb_offset
== -1) {
2826 if (xfb_offset
% component_size
) {
2827 _mesa_glsl_error(loc
, state
,
2828 "invalid qualifier xfb_offset=%d must be a multiple "
2829 "of the first component size of the first qualified "
2830 "variable or block member. Or double if an aggregate "
2831 "that contains a double (%d).",
2832 xfb_offset
, component_size
);
2840 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2843 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2844 _mesa_glsl_error(loc
, state
,
2845 "invalid stream specified %d is larger than "
2846 "MAX_VERTEX_STREAMS - 1 (%d).",
2847 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2855 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2858 const glsl_type
*type
,
2859 const ast_type_qualifier
*qual
)
2861 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2862 _mesa_glsl_error(loc
, state
,
2863 "the \"binding\" qualifier only applies to uniforms and "
2864 "shader storage buffer objects");
2868 unsigned qual_binding
;
2869 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2874 const struct gl_context
*const ctx
= state
->ctx
;
2875 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2876 unsigned max_index
= qual_binding
+ elements
- 1;
2877 const glsl_type
*base_type
= type
->without_array();
2879 if (base_type
->is_interface()) {
2880 /* UBOs. From page 60 of the GLSL 4.20 specification:
2881 * "If the binding point for any uniform block instance is less than zero,
2882 * or greater than or equal to the implementation-dependent maximum
2883 * number of uniform buffer bindings, a compilation error will occur.
2884 * When the binding identifier is used with a uniform block instanced as
2885 * an array of size N, all elements of the array from binding through
2886 * binding + N – 1 must be within this range."
2888 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2890 if (qual
->flags
.q
.uniform
&&
2891 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2892 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2893 "the maximum number of UBO binding points (%d)",
2894 qual_binding
, elements
,
2895 ctx
->Const
.MaxUniformBufferBindings
);
2899 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2900 * "If the binding point for any uniform or shader storage block instance
2901 * is less than zero, or greater than or equal to the
2902 * implementation-dependent maximum number of uniform buffer bindings, a
2903 * compile-time error will occur. When the binding identifier is used
2904 * with a uniform or shader storage block instanced as an array of size
2905 * N, all elements of the array from binding through binding + N – 1 must
2906 * be within this range."
2908 if (qual
->flags
.q
.buffer
&&
2909 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2910 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2911 "the maximum number of SSBO binding points (%d)",
2912 qual_binding
, elements
,
2913 ctx
->Const
.MaxShaderStorageBufferBindings
);
2916 } else if (base_type
->is_sampler()) {
2917 /* Samplers. From page 63 of the GLSL 4.20 specification:
2918 * "If the binding is less than zero, or greater than or equal to the
2919 * implementation-dependent maximum supported number of units, a
2920 * compilation error will occur. When the binding identifier is used
2921 * with an array of size N, all elements of the array from binding
2922 * through binding + N - 1 must be within this range."
2924 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2926 if (max_index
>= limit
) {
2927 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2928 "exceeds the maximum number of texture image units "
2929 "(%u)", qual_binding
, elements
, limit
);
2933 } else if (base_type
->contains_atomic()) {
2934 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2935 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2936 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2937 "maximum number of atomic counter buffer bindings "
2938 "(%u)", qual_binding
,
2939 ctx
->Const
.MaxAtomicBufferBindings
);
2943 } else if ((state
->is_version(420, 310) ||
2944 state
->ARB_shading_language_420pack_enable
) &&
2945 base_type
->is_image()) {
2946 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2947 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2948 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2949 "maximum number of image units (%d)", max_index
,
2950 ctx
->Const
.MaxImageUnits
);
2955 _mesa_glsl_error(loc
, state
,
2956 "the \"binding\" qualifier only applies to uniform "
2957 "blocks, storage blocks, opaque variables, or arrays "
2962 var
->data
.explicit_binding
= true;
2963 var
->data
.binding
= qual_binding
;
2969 validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state
*state
,
2971 const glsl_interp_mode interpolation
,
2972 const struct glsl_type
*var_type
,
2973 ir_variable_mode mode
)
2975 if (state
->stage
!= MESA_SHADER_FRAGMENT
||
2976 interpolation
== INTERP_MODE_FLAT
||
2977 mode
!= ir_var_shader_in
)
2980 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2981 * so must integer vertex outputs.
2983 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2984 * "Fragment shader inputs that are signed or unsigned integers or
2985 * integer vectors must be qualified with the interpolation qualifier
2988 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2989 * "Fragment shader inputs that are, or contain, signed or unsigned
2990 * integers or integer vectors must be qualified with the
2991 * interpolation qualifier flat."
2993 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2994 * "Vertex shader outputs that are, or contain, signed or unsigned
2995 * integers or integer vectors must be qualified with the
2996 * interpolation qualifier flat."
2998 * Note that prior to GLSL 1.50, this requirement applied to vertex
2999 * outputs rather than fragment inputs. That creates problems in the
3000 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3001 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3002 * apply the restriction to both vertex outputs and fragment inputs.
3004 * Note also that the desktop GLSL specs are missing the text "or
3005 * contain"; this is presumably an oversight, since there is no
3006 * reasonable way to interpolate a fragment shader input that contains
3007 * an integer. See Khronos bug #15671.
3009 if (state
->is_version(130, 300)
3010 && var_type
->contains_integer()) {
3011 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3012 "an integer, then it must be qualified with 'flat'");
3015 /* Double fragment inputs must be qualified with 'flat'.
3017 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
3018 * "This extension does not support interpolation of double-precision
3019 * values; doubles used as fragment shader inputs must be qualified as
3022 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
3023 * "Fragment shader inputs that are signed or unsigned integers, integer
3024 * vectors, or any double-precision floating-point type must be
3025 * qualified with the interpolation qualifier flat."
3027 * Note that the GLSL specs are missing the text "or contain"; this is
3028 * presumably an oversight. See Khronos bug #15671.
3030 * The 'double' type does not exist in GLSL ES so far.
3032 if (state
->has_double()
3033 && var_type
->contains_double()) {
3034 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3035 "a double, then it must be qualified with 'flat'");
3038 /* Bindless sampler/image fragment inputs must be qualified with 'flat'.
3040 * From section 4.3.4 of the ARB_bindless_texture spec:
3042 * "(modify last paragraph, p. 35, allowing samplers and images as
3043 * fragment shader inputs) ... Fragment inputs can only be signed and
3044 * unsigned integers and integer vectors, floating point scalars,
3045 * floating-point vectors, matrices, sampler and image types, or arrays
3046 * or structures of these. Fragment shader inputs that are signed or
3047 * unsigned integers, integer vectors, or any double-precision floating-
3048 * point type, or any sampler or image type must be qualified with the
3049 * interpolation qualifier "flat"."
3051 if (state
->has_bindless()
3052 && (var_type
->contains_sampler() || var_type
->contains_image())) {
3053 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3054 "a bindless sampler (or image), then it must be "
3055 "qualified with 'flat'");
3060 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
3062 const glsl_interp_mode interpolation
,
3063 const struct ast_type_qualifier
*qual
,
3064 const struct glsl_type
*var_type
,
3065 ir_variable_mode mode
)
3067 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
3068 * not to vertex shader inputs nor fragment shader outputs.
3070 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3071 * "Outputs from a vertex shader (out) and inputs to a fragment
3072 * shader (in) can be further qualified with one or more of these
3073 * interpolation qualifiers"
3075 * "These interpolation qualifiers may only precede the qualifiers in,
3076 * centroid in, out, or centroid out in a declaration. They do not apply
3077 * to the deprecated storage qualifiers varying or centroid
3078 * varying. They also do not apply to inputs into a vertex shader or
3079 * outputs from a fragment shader."
3081 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
3082 * "Outputs from a shader (out) and inputs to a shader (in) can be
3083 * further qualified with one of these interpolation qualifiers."
3085 * "These interpolation qualifiers may only precede the qualifiers
3086 * in, centroid in, out, or centroid out in a declaration. They do
3087 * not apply to inputs into a vertex shader or outputs from a
3090 if (state
->is_version(130, 300)
3091 && interpolation
!= INTERP_MODE_NONE
) {
3092 const char *i
= interpolation_string(interpolation
);
3093 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
3094 _mesa_glsl_error(loc
, state
,
3095 "interpolation qualifier `%s' can only be applied to "
3096 "shader inputs or outputs.", i
);
3098 switch (state
->stage
) {
3099 case MESA_SHADER_VERTEX
:
3100 if (mode
== ir_var_shader_in
) {
3101 _mesa_glsl_error(loc
, state
,
3102 "interpolation qualifier '%s' cannot be applied to "
3103 "vertex shader inputs", i
);
3106 case MESA_SHADER_FRAGMENT
:
3107 if (mode
== ir_var_shader_out
) {
3108 _mesa_glsl_error(loc
, state
,
3109 "interpolation qualifier '%s' cannot be applied to "
3110 "fragment shader outputs", i
);
3118 /* Interpolation qualifiers cannot be applied to 'centroid' and
3119 * 'centroid varying'.
3121 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3122 * "interpolation qualifiers may only precede the qualifiers in,
3123 * centroid in, out, or centroid out in a declaration. They do not apply
3124 * to the deprecated storage qualifiers varying or centroid varying."
3126 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3128 if (state
->is_version(130, 0)
3129 && interpolation
!= INTERP_MODE_NONE
3130 && qual
->flags
.q
.varying
) {
3132 const char *i
= interpolation_string(interpolation
);
3134 if (qual
->flags
.q
.centroid
)
3135 s
= "centroid varying";
3139 _mesa_glsl_error(loc
, state
,
3140 "qualifier '%s' cannot be applied to the "
3141 "deprecated storage qualifier '%s'", i
, s
);
3144 validate_fragment_flat_interpolation_input(state
, loc
, interpolation
,
3148 static glsl_interp_mode
3149 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3150 const struct glsl_type
*var_type
,
3151 ir_variable_mode mode
,
3152 struct _mesa_glsl_parse_state
*state
,
3155 glsl_interp_mode interpolation
;
3156 if (qual
->flags
.q
.flat
)
3157 interpolation
= INTERP_MODE_FLAT
;
3158 else if (qual
->flags
.q
.noperspective
)
3159 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3160 else if (qual
->flags
.q
.smooth
)
3161 interpolation
= INTERP_MODE_SMOOTH
;
3163 interpolation
= INTERP_MODE_NONE
;
3165 validate_interpolation_qualifier(state
, loc
,
3167 qual
, var_type
, mode
);
3169 return interpolation
;
3174 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3176 struct _mesa_glsl_parse_state
*state
,
3181 unsigned qual_location
;
3182 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3187 /* Checks for GL_ARB_explicit_uniform_location. */
3188 if (qual
->flags
.q
.uniform
) {
3189 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3192 const struct gl_context
*const ctx
= state
->ctx
;
3193 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3195 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3196 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3197 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3198 ctx
->Const
.MaxUserAssignableUniformLocations
);
3202 var
->data
.explicit_location
= true;
3203 var
->data
.location
= qual_location
;
3207 /* Between GL_ARB_explicit_attrib_location an
3208 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3209 * stage can be assigned explicit locations. The checking here associates
3210 * the correct extension with the correct stage's input / output:
3214 * vertex explicit_loc sso
3215 * tess control sso sso
3218 * fragment sso explicit_loc
3220 switch (state
->stage
) {
3221 case MESA_SHADER_VERTEX
:
3222 if (var
->data
.mode
== ir_var_shader_in
) {
3223 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3229 if (var
->data
.mode
== ir_var_shader_out
) {
3230 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3239 case MESA_SHADER_TESS_CTRL
:
3240 case MESA_SHADER_TESS_EVAL
:
3241 case MESA_SHADER_GEOMETRY
:
3242 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3243 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3252 case MESA_SHADER_FRAGMENT
:
3253 if (var
->data
.mode
== ir_var_shader_in
) {
3254 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3260 if (var
->data
.mode
== ir_var_shader_out
) {
3261 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3270 case MESA_SHADER_COMPUTE
:
3271 _mesa_glsl_error(loc
, state
,
3272 "compute shader variables cannot be given "
3273 "explicit locations");
3281 _mesa_glsl_error(loc
, state
,
3282 "%s cannot be given an explicit location in %s shader",
3284 _mesa_shader_stage_to_string(state
->stage
));
3286 var
->data
.explicit_location
= true;
3288 switch (state
->stage
) {
3289 case MESA_SHADER_VERTEX
:
3290 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3291 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3292 : (qual_location
+ VARYING_SLOT_VAR0
);
3295 case MESA_SHADER_TESS_CTRL
:
3296 case MESA_SHADER_TESS_EVAL
:
3297 case MESA_SHADER_GEOMETRY
:
3298 if (var
->data
.patch
)
3299 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3301 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3304 case MESA_SHADER_FRAGMENT
:
3305 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3306 ? (qual_location
+ FRAG_RESULT_DATA0
)
3307 : (qual_location
+ VARYING_SLOT_VAR0
);
3310 assert(!"Unexpected shader type");
3314 /* Check if index was set for the uniform instead of the function */
3315 if (qual
->flags
.q
.explicit_index
&& qual
->is_subroutine_decl()) {
3316 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3317 "used with subroutine functions");
3321 unsigned qual_index
;
3322 if (qual
->flags
.q
.explicit_index
&&
3323 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3325 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3326 * Layout Qualifiers):
3328 * "It is also a compile-time error if a fragment shader
3329 * sets a layout index to less than 0 or greater than 1."
3331 * Older specifications don't mandate a behavior; we take
3332 * this as a clarification and always generate the error.
3334 if (qual_index
> 1) {
3335 _mesa_glsl_error(loc
, state
,
3336 "explicit index may only be 0 or 1");
3338 var
->data
.explicit_index
= true;
3339 var
->data
.index
= qual_index
;
3346 validate_storage_for_sampler_image_types(ir_variable
*var
,
3347 struct _mesa_glsl_parse_state
*state
,
3350 /* From section 4.1.7 of the GLSL 4.40 spec:
3352 * "[Opaque types] can only be declared as function
3353 * parameters or uniform-qualified variables."
3355 * From section 4.1.7 of the ARB_bindless_texture spec:
3357 * "Samplers may be declared as shader inputs and outputs, as uniform
3358 * variables, as temporary variables, and as function parameters."
3360 * From section 4.1.X of the ARB_bindless_texture spec:
3362 * "Images may be declared as shader inputs and outputs, as uniform
3363 * variables, as temporary variables, and as function parameters."
3365 if (state
->has_bindless()) {
3366 if (var
->data
.mode
!= ir_var_auto
&&
3367 var
->data
.mode
!= ir_var_uniform
&&
3368 var
->data
.mode
!= ir_var_shader_in
&&
3369 var
->data
.mode
!= ir_var_shader_out
&&
3370 var
->data
.mode
!= ir_var_function_in
&&
3371 var
->data
.mode
!= ir_var_function_out
&&
3372 var
->data
.mode
!= ir_var_function_inout
) {
3373 _mesa_glsl_error(loc
, state
, "bindless image/sampler variables may "
3374 "only be declared as shader inputs and outputs, as "
3375 "uniform variables, as temporary variables and as "
3376 "function parameters");
3380 if (var
->data
.mode
!= ir_var_uniform
&&
3381 var
->data
.mode
!= ir_var_function_in
) {
3382 _mesa_glsl_error(loc
, state
, "image/sampler variables may only be "
3383 "declared as function parameters or "
3384 "uniform-qualified global variables");
3392 validate_memory_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3394 const struct ast_type_qualifier
*qual
,
3395 const glsl_type
*type
)
3397 /* From Section 4.10 (Memory Qualifiers) of the GLSL 4.50 spec:
3399 * "Memory qualifiers are only supported in the declarations of image
3400 * variables, buffer variables, and shader storage blocks; it is an error
3401 * to use such qualifiers in any other declarations.
3403 if (!type
->is_image() && !qual
->flags
.q
.buffer
) {
3404 if (qual
->flags
.q
.read_only
||
3405 qual
->flags
.q
.write_only
||
3406 qual
->flags
.q
.coherent
||
3407 qual
->flags
.q
._volatile
||
3408 qual
->flags
.q
.restrict_flag
) {
3409 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied "
3410 "in the declarations of image variables, buffer "
3411 "variables, and shader storage blocks");
3419 validate_image_format_qualifier_for_type(struct _mesa_glsl_parse_state
*state
,
3421 const struct ast_type_qualifier
*qual
,
3422 const glsl_type
*type
)
3424 /* From section 4.4.6.2 (Format Layout Qualifiers) of the GLSL 4.50 spec:
3426 * "Format layout qualifiers can be used on image variable declarations
3427 * (those declared with a basic type having “image ” in its keyword)."
3429 if (!type
->is_image() && qual
->flags
.q
.explicit_image_format
) {
3430 _mesa_glsl_error(loc
, state
, "format layout qualifiers may only be "
3431 "applied to images");
3438 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3440 struct _mesa_glsl_parse_state
*state
,
3443 const glsl_type
*base_type
= var
->type
->without_array();
3445 if (!validate_image_format_qualifier_for_type(state
, loc
, qual
, base_type
) ||
3446 !validate_memory_qualifier_for_type(state
, loc
, qual
, base_type
))
3449 if (!base_type
->is_image())
3452 if (!validate_storage_for_sampler_image_types(var
, state
, loc
))
3455 var
->data
.memory_read_only
|= qual
->flags
.q
.read_only
;
3456 var
->data
.memory_write_only
|= qual
->flags
.q
.write_only
;
3457 var
->data
.memory_coherent
|= qual
->flags
.q
.coherent
;
3458 var
->data
.memory_volatile
|= qual
->flags
.q
._volatile
;
3459 var
->data
.memory_restrict
|= qual
->flags
.q
.restrict_flag
;
3461 if (qual
->flags
.q
.explicit_image_format
) {
3462 if (var
->data
.mode
== ir_var_function_in
) {
3463 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be used on "
3464 "image function parameters");
3467 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3468 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the base "
3469 "data type of the image");
3472 var
->data
.image_format
= qual
->image_format
;
3474 if (var
->data
.mode
== ir_var_uniform
) {
3475 if (state
->es_shader
) {
3476 _mesa_glsl_error(loc
, state
, "all image uniforms must have a "
3477 "format layout qualifier");
3478 } else if (!qual
->flags
.q
.write_only
) {
3479 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3480 "`writeonly' must have a format layout qualifier");
3483 var
->data
.image_format
= GL_NONE
;
3486 /* From page 70 of the GLSL ES 3.1 specification:
3488 * "Except for image variables qualified with the format qualifiers r32f,
3489 * r32i, and r32ui, image variables must specify either memory qualifier
3490 * readonly or the memory qualifier writeonly."
3492 if (state
->es_shader
&&
3493 var
->data
.image_format
!= GL_R32F
&&
3494 var
->data
.image_format
!= GL_R32I
&&
3495 var
->data
.image_format
!= GL_R32UI
&&
3496 !var
->data
.memory_read_only
&&
3497 !var
->data
.memory_write_only
) {
3498 _mesa_glsl_error(loc
, state
, "image variables of format other than r32f, "
3499 "r32i or r32ui must be qualified `readonly' or "
3504 static inline const char*
3505 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3507 if (origin_upper_left
&& pixel_center_integer
)
3508 return "origin_upper_left, pixel_center_integer";
3509 else if (origin_upper_left
)
3510 return "origin_upper_left";
3511 else if (pixel_center_integer
)
3512 return "pixel_center_integer";
3518 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3519 const struct ast_type_qualifier
*qual
)
3521 /* If gl_FragCoord was previously declared, and the qualifiers were
3522 * different in any way, return true.
3524 if (state
->fs_redeclares_gl_fragcoord
) {
3525 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3526 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3533 validate_array_dimensions(const glsl_type
*t
,
3534 struct _mesa_glsl_parse_state
*state
,
3536 if (t
->is_array()) {
3537 t
= t
->fields
.array
;
3538 while (t
->is_array()) {
3539 if (t
->is_unsized_array()) {
3540 _mesa_glsl_error(loc
, state
,
3541 "only the outermost array dimension can "
3546 t
= t
->fields
.array
;
3552 apply_bindless_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3554 struct _mesa_glsl_parse_state
*state
,
3557 bool has_local_qualifiers
= qual
->flags
.q
.bindless_sampler
||
3558 qual
->flags
.q
.bindless_image
||
3559 qual
->flags
.q
.bound_sampler
||
3560 qual
->flags
.q
.bound_image
;
3562 /* The ARB_bindless_texture spec says:
3564 * "Modify Section 4.4.6 Opaque-Uniform Layout Qualifiers of the GLSL 4.30
3567 * "If these layout qualifiers are applied to other types of default block
3568 * uniforms, or variables with non-uniform storage, a compile-time error
3569 * will be generated."
3571 if (has_local_qualifiers
&& !qual
->flags
.q
.uniform
) {
3572 _mesa_glsl_error(loc
, state
, "ARB_bindless_texture layout qualifiers "
3573 "can only be applied to default block uniforms or "
3574 "variables with uniform storage");
3578 /* The ARB_bindless_texture spec doesn't state anything in this situation,
3579 * but it makes sense to only allow bindless_sampler/bound_sampler for
3580 * sampler types, and respectively bindless_image/bound_image for image
3583 if ((qual
->flags
.q
.bindless_sampler
|| qual
->flags
.q
.bound_sampler
) &&
3584 !var
->type
->contains_sampler()) {
3585 _mesa_glsl_error(loc
, state
, "bindless_sampler or bound_sampler can only "
3586 "be applied to sampler types");
3590 if ((qual
->flags
.q
.bindless_image
|| qual
->flags
.q
.bound_image
) &&
3591 !var
->type
->contains_image()) {
3592 _mesa_glsl_error(loc
, state
, "bindless_image or bound_image can only be "
3593 "applied to image types");
3597 /* The bindless_sampler/bindless_image (and respectively
3598 * bound_sampler/bound_image) layout qualifiers can be set at global and at
3601 if (var
->type
->contains_sampler() || var
->type
->contains_image()) {
3602 var
->data
.bindless
= qual
->flags
.q
.bindless_sampler
||
3603 qual
->flags
.q
.bindless_image
||
3604 state
->bindless_sampler_specified
||
3605 state
->bindless_image_specified
;
3607 var
->data
.bound
= qual
->flags
.q
.bound_sampler
||
3608 qual
->flags
.q
.bound_image
||
3609 state
->bound_sampler_specified
||
3610 state
->bound_image_specified
;
3615 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3617 struct _mesa_glsl_parse_state
*state
,
3620 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3622 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3624 * "Within any shader, the first redeclarations of gl_FragCoord
3625 * must appear before any use of gl_FragCoord."
3627 * Generate a compiler error if above condition is not met by the
3630 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3631 if (earlier
!= NULL
&&
3632 earlier
->data
.used
&&
3633 !state
->fs_redeclares_gl_fragcoord
) {
3634 _mesa_glsl_error(loc
, state
,
3635 "gl_FragCoord used before its first redeclaration "
3636 "in fragment shader");
3639 /* Make sure all gl_FragCoord redeclarations specify the same layout
3642 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3643 const char *const qual_string
=
3644 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3645 qual
->flags
.q
.pixel_center_integer
);
3647 const char *const state_string
=
3648 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3649 state
->fs_pixel_center_integer
);
3651 _mesa_glsl_error(loc
, state
,
3652 "gl_FragCoord redeclared with different layout "
3653 "qualifiers (%s) and (%s) ",
3657 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3658 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3659 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3660 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3661 state
->fs_redeclares_gl_fragcoord
=
3662 state
->fs_origin_upper_left
||
3663 state
->fs_pixel_center_integer
||
3664 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3667 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3668 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3669 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3670 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3671 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3672 ? "origin_upper_left" : "pixel_center_integer";
3674 _mesa_glsl_error(loc
, state
,
3675 "layout qualifier `%s' can only be applied to "
3676 "fragment shader input `gl_FragCoord'",
3680 if (qual
->flags
.q
.explicit_location
) {
3681 apply_explicit_location(qual
, var
, state
, loc
);
3683 if (qual
->flags
.q
.explicit_component
) {
3684 unsigned qual_component
;
3685 if (process_qualifier_constant(state
, loc
, "component",
3686 qual
->component
, &qual_component
)) {
3687 const glsl_type
*type
= var
->type
->without_array();
3688 unsigned components
= type
->component_slots();
3690 if (type
->is_matrix() || type
->is_record()) {
3691 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3692 "cannot be applied to a matrix, a structure, "
3693 "a block, or an array containing any of "
3695 } else if (qual_component
!= 0 &&
3696 (qual_component
+ components
- 1) > 3) {
3697 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3698 (qual_component
+ components
- 1));
3699 } else if (qual_component
== 1 && type
->is_64bit()) {
3700 /* We don't bother checking for 3 as it should be caught by the
3701 * overflow check above.
3703 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3704 "component 1 or 3");
3706 var
->data
.explicit_component
= true;
3707 var
->data
.location_frac
= qual_component
;
3711 } else if (qual
->flags
.q
.explicit_index
) {
3712 if (!qual
->subroutine_list
)
3713 _mesa_glsl_error(loc
, state
,
3714 "explicit index requires explicit location");
3715 } else if (qual
->flags
.q
.explicit_component
) {
3716 _mesa_glsl_error(loc
, state
,
3717 "explicit component requires explicit location");
3720 if (qual
->flags
.q
.explicit_binding
) {
3721 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3724 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3725 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3726 unsigned qual_stream
;
3727 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3729 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3730 var
->data
.stream
= qual_stream
;
3734 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3735 unsigned qual_xfb_buffer
;
3736 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3737 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3738 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3739 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3740 if (qual
->flags
.q
.explicit_xfb_buffer
)
3741 var
->data
.explicit_xfb_buffer
= true;
3745 if (qual
->flags
.q
.explicit_xfb_offset
) {
3746 unsigned qual_xfb_offset
;
3747 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3749 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3750 qual
->offset
, &qual_xfb_offset
) &&
3751 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3752 var
->type
, component_size
)) {
3753 var
->data
.offset
= qual_xfb_offset
;
3754 var
->data
.explicit_xfb_offset
= true;
3758 if (qual
->flags
.q
.explicit_xfb_stride
) {
3759 unsigned qual_xfb_stride
;
3760 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3761 qual
->xfb_stride
, &qual_xfb_stride
)) {
3762 var
->data
.xfb_stride
= qual_xfb_stride
;
3763 var
->data
.explicit_xfb_stride
= true;
3767 if (var
->type
->contains_atomic()) {
3768 if (var
->data
.mode
== ir_var_uniform
) {
3769 if (var
->data
.explicit_binding
) {
3771 &state
->atomic_counter_offsets
[var
->data
.binding
];
3773 if (*offset
% ATOMIC_COUNTER_SIZE
)
3774 _mesa_glsl_error(loc
, state
,
3775 "misaligned atomic counter offset");
3777 var
->data
.offset
= *offset
;
3778 *offset
+= var
->type
->atomic_size();
3781 _mesa_glsl_error(loc
, state
,
3782 "atomic counters require explicit binding point");
3784 } else if (var
->data
.mode
!= ir_var_function_in
) {
3785 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3786 "function parameters or uniform-qualified "
3787 "global variables");
3791 if (var
->type
->contains_sampler() &&
3792 !validate_storage_for_sampler_image_types(var
, state
, loc
))
3795 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3796 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3797 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3798 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3799 * These extensions and all following extensions that add the 'layout'
3800 * keyword have been modified to require the use of 'in' or 'out'.
3802 * The following extension do not allow the deprecated keywords:
3804 * GL_AMD_conservative_depth
3805 * GL_ARB_conservative_depth
3806 * GL_ARB_gpu_shader5
3807 * GL_ARB_separate_shader_objects
3808 * GL_ARB_tessellation_shader
3809 * GL_ARB_transform_feedback3
3810 * GL_ARB_uniform_buffer_object
3812 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3813 * allow layout with the deprecated keywords.
3815 const bool relaxed_layout_qualifier_checking
=
3816 state
->ARB_fragment_coord_conventions_enable
;
3818 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3819 || qual
->flags
.q
.varying
;
3820 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3821 if (relaxed_layout_qualifier_checking
) {
3822 _mesa_glsl_warning(loc
, state
,
3823 "`layout' qualifier may not be used with "
3824 "`attribute' or `varying'");
3826 _mesa_glsl_error(loc
, state
,
3827 "`layout' qualifier may not be used with "
3828 "`attribute' or `varying'");
3832 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3833 * AMD_conservative_depth.
3835 if (qual
->flags
.q
.depth_type
3836 && !state
->is_version(420, 0)
3837 && !state
->AMD_conservative_depth_enable
3838 && !state
->ARB_conservative_depth_enable
) {
3839 _mesa_glsl_error(loc
, state
,
3840 "extension GL_AMD_conservative_depth or "
3841 "GL_ARB_conservative_depth must be enabled "
3842 "to use depth layout qualifiers");
3843 } else if (qual
->flags
.q
.depth_type
3844 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3845 _mesa_glsl_error(loc
, state
,
3846 "depth layout qualifiers can be applied only to "
3850 switch (qual
->depth_type
) {
3852 var
->data
.depth_layout
= ir_depth_layout_any
;
3854 case ast_depth_greater
:
3855 var
->data
.depth_layout
= ir_depth_layout_greater
;
3857 case ast_depth_less
:
3858 var
->data
.depth_layout
= ir_depth_layout_less
;
3860 case ast_depth_unchanged
:
3861 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3864 var
->data
.depth_layout
= ir_depth_layout_none
;
3868 if (qual
->flags
.q
.std140
||
3869 qual
->flags
.q
.std430
||
3870 qual
->flags
.q
.packed
||
3871 qual
->flags
.q
.shared
) {
3872 _mesa_glsl_error(loc
, state
,
3873 "uniform and shader storage block layout qualifiers "
3874 "std140, std430, packed, and shared can only be "
3875 "applied to uniform or shader storage blocks, not "
3879 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3880 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3883 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3886 * "Fragment shaders also allow the following layout qualifier on in only
3887 * (not with variable declarations)
3888 * layout-qualifier-id
3889 * early_fragment_tests
3892 if (qual
->flags
.q
.early_fragment_tests
) {
3893 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3894 "valid in fragment shader input layout declaration.");
3897 if (qual
->flags
.q
.inner_coverage
) {
3898 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3899 "valid in fragment shader input layout declaration.");
3902 if (qual
->flags
.q
.post_depth_coverage
) {
3903 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3904 "valid in fragment shader input layout declaration.");
3907 if (state
->has_bindless())
3908 apply_bindless_qualifier_to_variable(qual
, var
, state
, loc
);
3910 if (qual
->flags
.q
.pixel_interlock_ordered
||
3911 qual
->flags
.q
.pixel_interlock_unordered
||
3912 qual
->flags
.q
.sample_interlock_ordered
||
3913 qual
->flags
.q
.sample_interlock_unordered
) {
3914 _mesa_glsl_error(loc
, state
, "interlock layout qualifiers: "
3915 "pixel_interlock_ordered, pixel_interlock_unordered, "
3916 "sample_interlock_ordered and sample_interlock_unordered, "
3917 "only valid in fragment shader input layout declaration.");
3922 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3924 struct _mesa_glsl_parse_state
*state
,
3928 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3930 if (qual
->flags
.q
.invariant
) {
3931 if (var
->data
.used
) {
3932 _mesa_glsl_error(loc
, state
,
3933 "variable `%s' may not be redeclared "
3934 "`invariant' after being used",
3937 var
->data
.invariant
= 1;
3941 if (qual
->flags
.q
.precise
) {
3942 if (var
->data
.used
) {
3943 _mesa_glsl_error(loc
, state
,
3944 "variable `%s' may not be redeclared "
3945 "`precise' after being used",
3948 var
->data
.precise
= 1;
3952 if (qual
->is_subroutine_decl() && !qual
->flags
.q
.uniform
) {
3953 _mesa_glsl_error(loc
, state
,
3954 "`subroutine' may only be applied to uniforms, "
3955 "subroutine type declarations, or function definitions");
3958 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3959 || qual
->flags
.q
.uniform
3960 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3961 var
->data
.read_only
= 1;
3963 if (qual
->flags
.q
.centroid
)
3964 var
->data
.centroid
= 1;
3966 if (qual
->flags
.q
.sample
)
3967 var
->data
.sample
= 1;
3969 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3970 if (state
->es_shader
) {
3971 var
->data
.precision
=
3972 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3975 if (qual
->flags
.q
.patch
)
3976 var
->data
.patch
= 1;
3978 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3979 var
->type
= glsl_type::error_type
;
3980 _mesa_glsl_error(loc
, state
,
3981 "`attribute' variables may not be declared in the "
3983 _mesa_shader_stage_to_string(state
->stage
));
3986 /* Disallow layout qualifiers which may only appear on layout declarations. */
3987 if (qual
->flags
.q
.prim_type
) {
3988 _mesa_glsl_error(loc
, state
,
3989 "Primitive type may only be specified on GS input or output "
3990 "layout declaration, not on variables.");
3993 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3995 * "However, the const qualifier cannot be used with out or inout."
3997 * The same section of the GLSL 4.40 spec further clarifies this saying:
3999 * "The const qualifier cannot be used with out or inout, or a
4000 * compile-time error results."
4002 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
4003 _mesa_glsl_error(loc
, state
,
4004 "`const' may not be applied to `out' or `inout' "
4005 "function parameters");
4008 /* If there is no qualifier that changes the mode of the variable, leave
4009 * the setting alone.
4011 assert(var
->data
.mode
!= ir_var_temporary
);
4012 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
4013 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
4014 else if (qual
->flags
.q
.in
)
4015 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
4016 else if (qual
->flags
.q
.attribute
4017 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
4018 var
->data
.mode
= ir_var_shader_in
;
4019 else if (qual
->flags
.q
.out
)
4020 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
4021 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
4022 var
->data
.mode
= ir_var_shader_out
;
4023 else if (qual
->flags
.q
.uniform
)
4024 var
->data
.mode
= ir_var_uniform
;
4025 else if (qual
->flags
.q
.buffer
)
4026 var
->data
.mode
= ir_var_shader_storage
;
4027 else if (qual
->flags
.q
.shared_storage
)
4028 var
->data
.mode
= ir_var_shader_shared
;
4030 if (!is_parameter
&& state
->has_framebuffer_fetch() &&
4031 state
->stage
== MESA_SHADER_FRAGMENT
) {
4032 if (state
->is_version(130, 300))
4033 var
->data
.fb_fetch_output
= qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
4035 var
->data
.fb_fetch_output
= (strcmp(var
->name
, "gl_LastFragData") == 0);
4038 if (var
->data
.fb_fetch_output
) {
4039 var
->data
.assigned
= true;
4040 var
->data
.memory_coherent
= !qual
->flags
.q
.non_coherent
;
4042 /* From the EXT_shader_framebuffer_fetch spec:
4044 * "It is an error to declare an inout fragment output not qualified
4045 * with layout(noncoherent) if the GL_EXT_shader_framebuffer_fetch
4046 * extension hasn't been enabled."
4048 if (var
->data
.memory_coherent
&&
4049 !state
->EXT_shader_framebuffer_fetch_enable
)
4050 _mesa_glsl_error(loc
, state
,
4051 "invalid declaration of framebuffer fetch output not "
4052 "qualified with layout(noncoherent)");
4055 /* From the EXT_shader_framebuffer_fetch spec:
4057 * "Fragment outputs declared inout may specify the following layout
4058 * qualifier: [...] noncoherent"
4060 if (qual
->flags
.q
.non_coherent
)
4061 _mesa_glsl_error(loc
, state
,
4062 "invalid layout(noncoherent) qualifier not part of "
4063 "framebuffer fetch output declaration");
4066 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
4067 /* User-defined ins/outs are not permitted in compute shaders. */
4068 if (state
->stage
== MESA_SHADER_COMPUTE
) {
4069 _mesa_glsl_error(loc
, state
,
4070 "user-defined input and output variables are not "
4071 "permitted in compute shaders");
4074 /* This variable is being used to link data between shader stages (in
4075 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
4076 * that is allowed for such purposes.
4078 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
4080 * "The varying qualifier can be used only with the data types
4081 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
4084 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
4085 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
4087 * "Fragment inputs can only be signed and unsigned integers and
4088 * integer vectors, float, floating-point vectors, matrices, or
4089 * arrays of these. Structures cannot be input.
4091 * Similar text exists in the section on vertex shader outputs.
4093 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
4094 * 3.00 spec allows structs as well. Varying structs are also allowed
4097 * From section 4.3.4 of the ARB_bindless_texture spec:
4099 * "(modify third paragraph of the section to allow sampler and image
4100 * types) ... Vertex shader inputs can only be float,
4101 * single-precision floating-point scalars, single-precision
4102 * floating-point vectors, matrices, signed and unsigned integers
4103 * and integer vectors, sampler and image types."
4105 * From section 4.3.6 of the ARB_bindless_texture spec:
4107 * "Output variables can only be floating-point scalars,
4108 * floating-point vectors, matrices, signed or unsigned integers or
4109 * integer vectors, sampler or image types, or arrays or structures
4112 switch (var
->type
->without_array()->base_type
) {
4113 case GLSL_TYPE_FLOAT
:
4114 /* Ok in all GLSL versions */
4116 case GLSL_TYPE_UINT
:
4118 if (state
->is_version(130, 300))
4120 _mesa_glsl_error(loc
, state
,
4121 "varying variables must be of base type float in %s",
4122 state
->get_version_string());
4124 case GLSL_TYPE_STRUCT
:
4125 if (state
->is_version(150, 300))
4127 _mesa_glsl_error(loc
, state
,
4128 "varying variables may not be of type struct");
4130 case GLSL_TYPE_DOUBLE
:
4131 case GLSL_TYPE_UINT64
:
4132 case GLSL_TYPE_INT64
:
4134 case GLSL_TYPE_SAMPLER
:
4135 case GLSL_TYPE_IMAGE
:
4136 if (state
->has_bindless())
4140 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
4145 if (state
->all_invariant
&& var
->data
.mode
== ir_var_shader_out
)
4146 var
->data
.invariant
= true;
4148 var
->data
.interpolation
=
4149 interpret_interpolation_qualifier(qual
, var
->type
,
4150 (ir_variable_mode
) var
->data
.mode
,
4153 /* Does the declaration use the deprecated 'attribute' or 'varying'
4156 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
4157 || qual
->flags
.q
.varying
;
4160 /* Validate auxiliary storage qualifiers */
4162 /* From section 4.3.4 of the GLSL 1.30 spec:
4163 * "It is an error to use centroid in in a vertex shader."
4165 * From section 4.3.4 of the GLSL ES 3.00 spec:
4166 * "It is an error to use centroid in or interpolation qualifiers in
4167 * a vertex shader input."
4170 /* Section 4.3.6 of the GLSL 1.30 specification states:
4171 * "It is an error to use centroid out in a fragment shader."
4173 * The GL_ARB_shading_language_420pack extension specification states:
4174 * "It is an error to use auxiliary storage qualifiers or interpolation
4175 * qualifiers on an output in a fragment shader."
4177 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
4178 _mesa_glsl_error(loc
, state
,
4179 "sample qualifier may only be used on `in` or `out` "
4180 "variables between shader stages");
4182 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
4183 _mesa_glsl_error(loc
, state
,
4184 "centroid qualifier may only be used with `in', "
4185 "`out' or `varying' variables between shader stages");
4188 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
4189 _mesa_glsl_error(loc
, state
,
4190 "the shared storage qualifiers can only be used with "
4194 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
4198 * Get the variable that is being redeclared by this declaration or if it
4199 * does not exist, the current declared variable.
4201 * Semantic checks to verify the validity of the redeclaration are also
4202 * performed. If semantic checks fail, compilation error will be emitted via
4203 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
4206 * A pointer to an existing variable in the current scope if the declaration
4207 * is a redeclaration, current variable otherwise. \c is_declared boolean
4208 * will return \c true if the declaration is a redeclaration, \c false
4211 static ir_variable
*
4212 get_variable_being_redeclared(ir_variable
**var_ptr
, YYLTYPE loc
,
4213 struct _mesa_glsl_parse_state
*state
,
4214 bool allow_all_redeclarations
,
4215 bool *is_redeclaration
)
4217 ir_variable
*var
= *var_ptr
;
4219 /* Check if this declaration is actually a re-declaration, either to
4220 * resize an array or add qualifiers to an existing variable.
4222 * This is allowed for variables in the current scope, or when at
4223 * global scope (for built-ins in the implicit outer scope).
4225 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
4226 if (earlier
== NULL
||
4227 (state
->current_function
!= NULL
&&
4228 !state
->symbols
->name_declared_this_scope(var
->name
))) {
4229 *is_redeclaration
= false;
4233 *is_redeclaration
= true;
4235 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4237 * "It is legal to declare an array without a size and then
4238 * later re-declare the same name as an array of the same
4239 * type and specify a size."
4241 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
4242 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
4243 /* FINISHME: This doesn't match the qualifiers on the two
4244 * FINISHME: declarations. It's not 100% clear whether this is
4245 * FINISHME: required or not.
4248 const int size
= var
->type
->array_size();
4249 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
4250 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4251 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4253 earlier
->data
.max_array_access
);
4256 earlier
->type
= var
->type
;
4260 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4261 state
->is_version(150, 0))
4262 && strcmp(var
->name
, "gl_FragCoord") == 0
4263 && earlier
->type
== var
->type
4264 && var
->data
.mode
== ir_var_shader_in
) {
4265 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4268 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
4269 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
4271 /* According to section 4.3.7 of the GLSL 1.30 spec,
4272 * the following built-in varaibles can be redeclared with an
4273 * interpolation qualifier:
4276 * * gl_FrontSecondaryColor
4277 * * gl_BackSecondaryColor
4279 * * gl_SecondaryColor
4281 } else if (state
->is_version(130, 0)
4282 && (strcmp(var
->name
, "gl_FrontColor") == 0
4283 || strcmp(var
->name
, "gl_BackColor") == 0
4284 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4285 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4286 || strcmp(var
->name
, "gl_Color") == 0
4287 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
4288 && earlier
->type
== var
->type
4289 && earlier
->data
.mode
== var
->data
.mode
) {
4290 earlier
->data
.interpolation
= var
->data
.interpolation
;
4292 /* Layout qualifiers for gl_FragDepth. */
4293 } else if ((state
->is_version(420, 0) ||
4294 state
->AMD_conservative_depth_enable
||
4295 state
->ARB_conservative_depth_enable
)
4296 && strcmp(var
->name
, "gl_FragDepth") == 0
4297 && earlier
->type
== var
->type
4298 && earlier
->data
.mode
== var
->data
.mode
) {
4300 /** From the AMD_conservative_depth spec:
4301 * Within any shader, the first redeclarations of gl_FragDepth
4302 * must appear before any use of gl_FragDepth.
4304 if (earlier
->data
.used
) {
4305 _mesa_glsl_error(&loc
, state
,
4306 "the first redeclaration of gl_FragDepth "
4307 "must appear before any use of gl_FragDepth");
4310 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4311 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4312 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4313 _mesa_glsl_error(&loc
, state
,
4314 "gl_FragDepth: depth layout is declared here "
4315 "as '%s, but it was previously declared as "
4317 depth_layout_string(var
->data
.depth_layout
),
4318 depth_layout_string(earlier
->data
.depth_layout
));
4321 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4323 } else if (state
->has_framebuffer_fetch() &&
4324 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4325 var
->type
== earlier
->type
&&
4326 var
->data
.mode
== ir_var_auto
) {
4327 /* According to the EXT_shader_framebuffer_fetch spec:
4329 * "By default, gl_LastFragData is declared with the mediump precision
4330 * qualifier. This can be changed by redeclaring the corresponding
4331 * variables with the desired precision qualifier."
4333 * "Fragment shaders may specify the following layout qualifier only for
4334 * redeclaring the built-in gl_LastFragData array [...]: noncoherent"
4336 earlier
->data
.precision
= var
->data
.precision
;
4337 earlier
->data
.memory_coherent
= var
->data
.memory_coherent
;
4339 } else if (earlier
->data
.how_declared
== ir_var_declared_implicitly
&&
4340 state
->allow_builtin_variable_redeclaration
) {
4341 /* Allow verbatim redeclarations of built-in variables. Not explicitly
4342 * valid, but some applications do it.
4344 if (earlier
->data
.mode
!= var
->data
.mode
&&
4345 !(earlier
->data
.mode
== ir_var_system_value
&&
4346 var
->data
.mode
== ir_var_shader_in
)) {
4347 _mesa_glsl_error(&loc
, state
,
4348 "redeclaration of `%s' with incorrect qualifiers",
4350 } else if (earlier
->type
!= var
->type
) {
4351 _mesa_glsl_error(&loc
, state
,
4352 "redeclaration of `%s' has incorrect type",
4355 } else if (allow_all_redeclarations
) {
4356 if (earlier
->data
.mode
!= var
->data
.mode
) {
4357 _mesa_glsl_error(&loc
, state
,
4358 "redeclaration of `%s' with incorrect qualifiers",
4360 } else if (earlier
->type
!= var
->type
) {
4361 _mesa_glsl_error(&loc
, state
,
4362 "redeclaration of `%s' has incorrect type",
4366 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4373 * Generate the IR for an initializer in a variable declaration
4376 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4377 ast_fully_specified_type
*type
,
4378 exec_list
*initializer_instructions
,
4379 struct _mesa_glsl_parse_state
*state
)
4381 void *mem_ctx
= state
;
4382 ir_rvalue
*result
= NULL
;
4384 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4386 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4388 * "All uniform variables are read-only and are initialized either
4389 * directly by an application via API commands, or indirectly by
4392 if (var
->data
.mode
== ir_var_uniform
) {
4393 state
->check_version(120, 0, &initializer_loc
,
4394 "cannot initialize uniform %s",
4398 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4400 * "Buffer variables cannot have initializers."
4402 if (var
->data
.mode
== ir_var_shader_storage
) {
4403 _mesa_glsl_error(&initializer_loc
, state
,
4404 "cannot initialize buffer variable %s",
4408 /* From section 4.1.7 of the GLSL 4.40 spec:
4410 * "Opaque variables [...] are initialized only through the
4411 * OpenGL API; they cannot be declared with an initializer in a
4414 * From section 4.1.7 of the ARB_bindless_texture spec:
4416 * "Samplers may be declared as shader inputs and outputs, as uniform
4417 * variables, as temporary variables, and as function parameters."
4419 * From section 4.1.X of the ARB_bindless_texture spec:
4421 * "Images may be declared as shader inputs and outputs, as uniform
4422 * variables, as temporary variables, and as function parameters."
4424 if (var
->type
->contains_atomic() ||
4425 (!state
->has_bindless() && var
->type
->contains_opaque())) {
4426 _mesa_glsl_error(&initializer_loc
, state
,
4427 "cannot initialize %s variable %s",
4428 var
->name
, state
->has_bindless() ? "atomic" : "opaque");
4431 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4432 _mesa_glsl_error(&initializer_loc
, state
,
4433 "cannot initialize %s shader input / %s %s",
4434 _mesa_shader_stage_to_string(state
->stage
),
4435 (state
->stage
== MESA_SHADER_VERTEX
)
4436 ? "attribute" : "varying",
4440 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4441 _mesa_glsl_error(&initializer_loc
, state
,
4442 "cannot initialize %s shader output %s",
4443 _mesa_shader_stage_to_string(state
->stage
),
4447 /* If the initializer is an ast_aggregate_initializer, recursively store
4448 * type information from the LHS into it, so that its hir() function can do
4451 if (decl
->initializer
->oper
== ast_aggregate
)
4452 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4454 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4455 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4457 /* Calculate the constant value if this is a const or uniform
4460 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4462 * "Declarations of globals without a storage qualifier, or with
4463 * just the const qualifier, may include initializers, in which case
4464 * they will be initialized before the first line of main() is
4465 * executed. Such initializers must be a constant expression."
4467 * The same section of the GLSL ES 3.00.4 spec has similar language.
4469 if (type
->qualifier
.flags
.q
.constant
4470 || type
->qualifier
.flags
.q
.uniform
4471 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4472 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4474 if (new_rhs
!= NULL
) {
4477 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4480 * "A constant expression is one of
4484 * - an expression formed by an operator on operands that are
4485 * all constant expressions, including getting an element of
4486 * a constant array, or a field of a constant structure, or
4487 * components of a constant vector. However, the sequence
4488 * operator ( , ) and the assignment operators ( =, +=, ...)
4489 * are not included in the operators that can create a
4490 * constant expression."
4492 * Section 12.43 (Sequence operator and constant expressions) says:
4494 * "Should the following construct be allowed?
4498 * The expression within the brackets uses the sequence operator
4499 * (',') and returns the integer 3 so the construct is declaring
4500 * a single-dimensional array of size 3. In some languages, the
4501 * construct declares a two-dimensional array. It would be
4502 * preferable to make this construct illegal to avoid confusion.
4504 * One possibility is to change the definition of the sequence
4505 * operator so that it does not return a constant-expression and
4506 * hence cannot be used to declare an array size.
4508 * RESOLUTION: The result of a sequence operator is not a
4509 * constant-expression."
4511 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4512 * contains language almost identical to the section 4.3.3 in the
4513 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4516 ir_constant
*constant_value
=
4517 rhs
->constant_expression_value(mem_ctx
);
4519 if (!constant_value
||
4520 (state
->is_version(430, 300) &&
4521 decl
->initializer
->has_sequence_subexpression())) {
4522 const char *const variable_mode
=
4523 (type
->qualifier
.flags
.q
.constant
)
4525 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4527 /* If ARB_shading_language_420pack is enabled, initializers of
4528 * const-qualified local variables do not have to be constant
4529 * expressions. Const-qualified global variables must still be
4530 * initialized with constant expressions.
4532 if (!state
->has_420pack()
4533 || state
->current_function
== NULL
) {
4534 _mesa_glsl_error(& initializer_loc
, state
,
4535 "initializer of %s variable `%s' must be a "
4536 "constant expression",
4539 if (var
->type
->is_numeric()) {
4540 /* Reduce cascading errors. */
4541 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4542 ? ir_constant::zero(state
, var
->type
) : NULL
;
4546 rhs
= constant_value
;
4547 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4548 ? constant_value
: NULL
;
4551 if (var
->type
->is_numeric()) {
4552 /* Reduce cascading errors. */
4553 rhs
= var
->constant_value
= type
->qualifier
.flags
.q
.constant
4554 ? ir_constant::zero(state
, var
->type
) : NULL
;
4559 if (rhs
&& !rhs
->type
->is_error()) {
4560 bool temp
= var
->data
.read_only
;
4561 if (type
->qualifier
.flags
.q
.constant
)
4562 var
->data
.read_only
= false;
4564 /* Never emit code to initialize a uniform.
4566 const glsl_type
*initializer_type
;
4567 bool error_emitted
= false;
4568 if (!type
->qualifier
.flags
.q
.uniform
) {
4570 do_assignment(initializer_instructions
, state
,
4572 &result
, true, true,
4573 type
->get_location());
4574 initializer_type
= result
->type
;
4576 initializer_type
= rhs
->type
;
4578 if (!error_emitted
) {
4579 var
->constant_initializer
= rhs
->constant_expression_value(mem_ctx
);
4580 var
->data
.has_initializer
= true;
4582 /* If the declared variable is an unsized array, it must inherrit
4583 * its full type from the initializer. A declaration such as
4585 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4589 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4591 * The assignment generated in the if-statement (below) will also
4592 * automatically handle this case for non-uniforms.
4594 * If the declared variable is not an array, the types must
4595 * already match exactly. As a result, the type assignment
4596 * here can be done unconditionally. For non-uniforms the call
4597 * to do_assignment can change the type of the initializer (via
4598 * the implicit conversion rules). For uniforms the initializer
4599 * must be a constant expression, and the type of that expression
4600 * was validated above.
4602 var
->type
= initializer_type
;
4605 var
->data
.read_only
= temp
;
4612 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4613 YYLTYPE loc
, ir_variable
*var
,
4614 unsigned num_vertices
,
4616 const char *var_category
)
4618 if (var
->type
->is_unsized_array()) {
4619 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4621 * All geometry shader input unsized array declarations will be
4622 * sized by an earlier input layout qualifier, when present, as per
4623 * the following table.
4625 * Followed by a table mapping each allowed input layout qualifier to
4626 * the corresponding input length.
4628 * Similarly for tessellation control shader outputs.
4630 if (num_vertices
!= 0)
4631 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4634 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4635 * includes the following examples of compile-time errors:
4637 * // code sequence within one shader...
4638 * in vec4 Color1[]; // size unknown
4639 * ...Color1.length()...// illegal, length() unknown
4640 * in vec4 Color2[2]; // size is 2
4641 * ...Color1.length()...// illegal, Color1 still has no size
4642 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4643 * layout(lines) in; // legal, input size is 2, matching
4644 * in vec4 Color4[3]; // illegal, contradicts layout
4647 * To detect the case illustrated by Color3, we verify that the size of
4648 * an explicitly-sized array matches the size of any previously declared
4649 * explicitly-sized array. To detect the case illustrated by Color4, we
4650 * verify that the size of an explicitly-sized array is consistent with
4651 * any previously declared input layout.
4653 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4654 _mesa_glsl_error(&loc
, state
,
4655 "%s size contradicts previously declared layout "
4656 "(size is %u, but layout requires a size of %u)",
4657 var_category
, var
->type
->length
, num_vertices
);
4658 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4659 _mesa_glsl_error(&loc
, state
,
4660 "%s sizes are inconsistent (size is %u, but a "
4661 "previous declaration has size %u)",
4662 var_category
, var
->type
->length
, *size
);
4664 *size
= var
->type
->length
;
4670 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4671 YYLTYPE loc
, ir_variable
*var
)
4673 unsigned num_vertices
= 0;
4675 if (state
->tcs_output_vertices_specified
) {
4676 if (!state
->out_qualifier
->vertices
->
4677 process_qualifier_constant(state
, "vertices",
4678 &num_vertices
, false)) {
4682 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4683 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4684 "GL_MAX_PATCH_VERTICES", num_vertices
);
4689 if (!var
->type
->is_array() && !var
->data
.patch
) {
4690 _mesa_glsl_error(&loc
, state
,
4691 "tessellation control shader outputs must be arrays");
4693 /* To avoid cascading failures, short circuit the checks below. */
4697 if (var
->data
.patch
)
4700 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4701 &state
->tcs_output_size
,
4702 "tessellation control shader output");
4706 * Do additional processing necessary for tessellation control/evaluation shader
4707 * input declarations. This covers both interface block arrays and bare input
4711 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4712 YYLTYPE loc
, ir_variable
*var
)
4714 if (!var
->type
->is_array() && !var
->data
.patch
) {
4715 _mesa_glsl_error(&loc
, state
,
4716 "per-vertex tessellation shader inputs must be arrays");
4717 /* Avoid cascading failures. */
4721 if (var
->data
.patch
)
4724 /* The ARB_tessellation_shader spec says:
4726 * "Declaring an array size is optional. If no size is specified, it
4727 * will be taken from the implementation-dependent maximum patch size
4728 * (gl_MaxPatchVertices). If a size is specified, it must match the
4729 * maximum patch size; otherwise, a compile or link error will occur."
4731 * This text appears twice, once for TCS inputs, and again for TES inputs.
4733 if (var
->type
->is_unsized_array()) {
4734 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4735 state
->Const
.MaxPatchVertices
);
4736 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4737 _mesa_glsl_error(&loc
, state
,
4738 "per-vertex tessellation shader input arrays must be "
4739 "sized to gl_MaxPatchVertices (%d).",
4740 state
->Const
.MaxPatchVertices
);
4746 * Do additional processing necessary for geometry shader input declarations
4747 * (this covers both interface blocks arrays and bare input variables).
4750 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4751 YYLTYPE loc
, ir_variable
*var
)
4753 unsigned num_vertices
= 0;
4755 if (state
->gs_input_prim_type_specified
) {
4756 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4759 /* Geometry shader input variables must be arrays. Caller should have
4760 * reported an error for this.
4762 if (!var
->type
->is_array()) {
4763 assert(state
->error
);
4765 /* To avoid cascading failures, short circuit the checks below. */
4769 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4770 &state
->gs_input_size
,
4771 "geometry shader input");
4775 validate_identifier(const char *identifier
, YYLTYPE loc
,
4776 struct _mesa_glsl_parse_state
*state
)
4778 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4780 * "Identifiers starting with "gl_" are reserved for use by
4781 * OpenGL, and may not be declared in a shader as either a
4782 * variable or a function."
4784 if (is_gl_identifier(identifier
)) {
4785 _mesa_glsl_error(&loc
, state
,
4786 "identifier `%s' uses reserved `gl_' prefix",
4788 } else if (strstr(identifier
, "__")) {
4789 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4792 * "In addition, all identifiers containing two
4793 * consecutive underscores (__) are reserved as
4794 * possible future keywords."
4796 * The intention is that names containing __ are reserved for internal
4797 * use by the implementation, and names prefixed with GL_ are reserved
4798 * for use by Khronos. Names simply containing __ are dangerous to use,
4799 * but should be allowed.
4801 * A future version of the GLSL specification will clarify this.
4803 _mesa_glsl_warning(&loc
, state
,
4804 "identifier `%s' uses reserved `__' string",
4810 ast_declarator_list::hir(exec_list
*instructions
,
4811 struct _mesa_glsl_parse_state
*state
)
4814 const struct glsl_type
*decl_type
;
4815 const char *type_name
= NULL
;
4816 ir_rvalue
*result
= NULL
;
4817 YYLTYPE loc
= this->get_location();
4819 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4821 * "To ensure that a particular output variable is invariant, it is
4822 * necessary to use the invariant qualifier. It can either be used to
4823 * qualify a previously declared variable as being invariant
4825 * invariant gl_Position; // make existing gl_Position be invariant"
4827 * In these cases the parser will set the 'invariant' flag in the declarator
4828 * list, and the type will be NULL.
4830 if (this->invariant
) {
4831 assert(this->type
== NULL
);
4833 if (state
->current_function
!= NULL
) {
4834 _mesa_glsl_error(& loc
, state
,
4835 "all uses of `invariant' keyword must be at global "
4839 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4840 assert(decl
->array_specifier
== NULL
);
4841 assert(decl
->initializer
== NULL
);
4843 ir_variable
*const earlier
=
4844 state
->symbols
->get_variable(decl
->identifier
);
4845 if (earlier
== NULL
) {
4846 _mesa_glsl_error(& loc
, state
,
4847 "undeclared variable `%s' cannot be marked "
4848 "invariant", decl
->identifier
);
4849 } else if (!is_allowed_invariant(earlier
, state
)) {
4850 _mesa_glsl_error(&loc
, state
,
4851 "`%s' cannot be marked invariant; interfaces between "
4852 "shader stages only.", decl
->identifier
);
4853 } else if (earlier
->data
.used
) {
4854 _mesa_glsl_error(& loc
, state
,
4855 "variable `%s' may not be redeclared "
4856 "`invariant' after being used",
4859 earlier
->data
.invariant
= true;
4863 /* Invariant redeclarations do not have r-values.
4868 if (this->precise
) {
4869 assert(this->type
== NULL
);
4871 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4872 assert(decl
->array_specifier
== NULL
);
4873 assert(decl
->initializer
== NULL
);
4875 ir_variable
*const earlier
=
4876 state
->symbols
->get_variable(decl
->identifier
);
4877 if (earlier
== NULL
) {
4878 _mesa_glsl_error(& loc
, state
,
4879 "undeclared variable `%s' cannot be marked "
4880 "precise", decl
->identifier
);
4881 } else if (state
->current_function
!= NULL
&&
4882 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4883 /* Note: we have to check if we're in a function, since
4884 * builtins are treated as having come from another scope.
4886 _mesa_glsl_error(& loc
, state
,
4887 "variable `%s' from an outer scope may not be "
4888 "redeclared `precise' in this scope",
4890 } else if (earlier
->data
.used
) {
4891 _mesa_glsl_error(& loc
, state
,
4892 "variable `%s' may not be redeclared "
4893 "`precise' after being used",
4896 earlier
->data
.precise
= true;
4900 /* Precise redeclarations do not have r-values either. */
4904 assert(this->type
!= NULL
);
4905 assert(!this->invariant
);
4906 assert(!this->precise
);
4908 /* The type specifier may contain a structure definition. Process that
4909 * before any of the variable declarations.
4911 (void) this->type
->specifier
->hir(instructions
, state
);
4913 decl_type
= this->type
->glsl_type(& type_name
, state
);
4915 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4916 * "Buffer variables may only be declared inside interface blocks
4917 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4918 * shader storage blocks. It is a compile-time error to declare buffer
4919 * variables at global scope (outside a block)."
4921 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4922 _mesa_glsl_error(&loc
, state
,
4923 "buffer variables cannot be declared outside "
4924 "interface blocks");
4927 /* An offset-qualified atomic counter declaration sets the default
4928 * offset for the next declaration within the same atomic counter
4931 if (decl_type
&& decl_type
->contains_atomic()) {
4932 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4933 type
->qualifier
.flags
.q
.explicit_offset
) {
4934 unsigned qual_binding
;
4935 unsigned qual_offset
;
4936 if (process_qualifier_constant(state
, &loc
, "binding",
4937 type
->qualifier
.binding
,
4939 && process_qualifier_constant(state
, &loc
, "offset",
4940 type
->qualifier
.offset
,
4942 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4946 ast_type_qualifier allowed_atomic_qual_mask
;
4947 allowed_atomic_qual_mask
.flags
.i
= 0;
4948 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4949 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4950 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4952 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4953 "invalid layout qualifier for",
4957 if (this->declarations
.is_empty()) {
4958 /* If there is no structure involved in the program text, there are two
4959 * possible scenarios:
4961 * - The program text contained something like 'vec4;'. This is an
4962 * empty declaration. It is valid but weird. Emit a warning.
4964 * - The program text contained something like 'S;' and 'S' is not the
4965 * name of a known structure type. This is both invalid and weird.
4968 * - The program text contained something like 'mediump float;'
4969 * when the programmer probably meant 'precision mediump
4970 * float;' Emit a warning with a description of what they
4971 * probably meant to do.
4973 * Note that if decl_type is NULL and there is a structure involved,
4974 * there must have been some sort of error with the structure. In this
4975 * case we assume that an error was already generated on this line of
4976 * code for the structure. There is no need to generate an additional,
4979 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4982 if (decl_type
== NULL
) {
4983 _mesa_glsl_error(&loc
, state
,
4984 "invalid type `%s' in empty declaration",
4987 if (decl_type
->is_array()) {
4988 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4991 * "... any declaration that leaves the size undefined is
4992 * disallowed as this would add complexity and there are no
4995 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4996 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4997 "or implicitly defined");
5000 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
5002 * "The combinations of types and qualifiers that cause
5003 * compile-time or link-time errors are the same whether or not
5004 * the declaration is empty."
5006 validate_array_dimensions(decl_type
, state
, &loc
);
5009 if (decl_type
->is_atomic_uint()) {
5010 /* Empty atomic counter declarations are allowed and useful
5011 * to set the default offset qualifier.
5014 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5015 if (this->type
->specifier
->structure
!= NULL
) {
5016 _mesa_glsl_error(&loc
, state
,
5017 "precision qualifiers can't be applied "
5020 static const char *const precision_names
[] = {
5027 _mesa_glsl_warning(&loc
, state
,
5028 "empty declaration with precision "
5029 "qualifier, to set the default precision, "
5030 "use `precision %s %s;'",
5031 precision_names
[this->type
->
5032 qualifier
.precision
],
5035 } else if (this->type
->specifier
->structure
== NULL
) {
5036 _mesa_glsl_warning(&loc
, state
, "empty declaration");
5041 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
5042 const struct glsl_type
*var_type
;
5044 const char *identifier
= decl
->identifier
;
5045 /* FINISHME: Emit a warning if a variable declaration shadows a
5046 * FINISHME: declaration at a higher scope.
5049 if ((decl_type
== NULL
) || decl_type
->is_void()) {
5050 if (type_name
!= NULL
) {
5051 _mesa_glsl_error(& loc
, state
,
5052 "invalid type `%s' in declaration of `%s'",
5053 type_name
, decl
->identifier
);
5055 _mesa_glsl_error(& loc
, state
,
5056 "invalid type in declaration of `%s'",
5062 if (this->type
->qualifier
.is_subroutine_decl()) {
5066 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
5068 _mesa_glsl_error(& loc
, state
,
5069 "invalid type in declaration of `%s'",
5071 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
5076 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
5079 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
5081 /* The 'varying in' and 'varying out' qualifiers can only be used with
5082 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
5085 if (this->type
->qualifier
.flags
.q
.varying
) {
5086 if (this->type
->qualifier
.flags
.q
.in
) {
5087 _mesa_glsl_error(& loc
, state
,
5088 "`varying in' qualifier in declaration of "
5089 "`%s' only valid for geometry shaders using "
5090 "ARB_geometry_shader4 or EXT_geometry_shader4",
5092 } else if (this->type
->qualifier
.flags
.q
.out
) {
5093 _mesa_glsl_error(& loc
, state
,
5094 "`varying out' qualifier in declaration of "
5095 "`%s' only valid for geometry shaders using "
5096 "ARB_geometry_shader4 or EXT_geometry_shader4",
5101 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
5103 * "Global variables can only use the qualifiers const,
5104 * attribute, uniform, or varying. Only one may be
5107 * Local variables can only use the qualifier const."
5109 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
5110 * any extension that adds the 'layout' keyword.
5112 if (!state
->is_version(130, 300)
5113 && !state
->has_explicit_attrib_location()
5114 && !state
->has_separate_shader_objects()
5115 && !state
->ARB_fragment_coord_conventions_enable
) {
5116 if (this->type
->qualifier
.flags
.q
.out
) {
5117 _mesa_glsl_error(& loc
, state
,
5118 "`out' qualifier in declaration of `%s' "
5119 "only valid for function parameters in %s",
5120 decl
->identifier
, state
->get_version_string());
5122 if (this->type
->qualifier
.flags
.q
.in
) {
5123 _mesa_glsl_error(& loc
, state
,
5124 "`in' qualifier in declaration of `%s' "
5125 "only valid for function parameters in %s",
5126 decl
->identifier
, state
->get_version_string());
5128 /* FINISHME: Test for other invalid qualifiers. */
5131 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
5133 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
5136 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
5137 && (var
->type
->is_numeric() || var
->type
->is_boolean())
5138 && state
->zero_init
) {
5139 const ir_constant_data data
= { { 0 } };
5140 var
->data
.has_initializer
= true;
5141 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
5144 if (this->type
->qualifier
.flags
.q
.invariant
) {
5145 if (!is_allowed_invariant(var
, state
)) {
5146 _mesa_glsl_error(&loc
, state
,
5147 "`%s' cannot be marked invariant; interfaces between "
5148 "shader stages only", var
->name
);
5152 if (state
->current_function
!= NULL
) {
5153 const char *mode
= NULL
;
5154 const char *extra
= "";
5156 /* There is no need to check for 'inout' here because the parser will
5157 * only allow that in function parameter lists.
5159 if (this->type
->qualifier
.flags
.q
.attribute
) {
5161 } else if (this->type
->qualifier
.is_subroutine_decl()) {
5162 mode
= "subroutine uniform";
5163 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
5165 } else if (this->type
->qualifier
.flags
.q
.varying
) {
5167 } else if (this->type
->qualifier
.flags
.q
.in
) {
5169 extra
= " or in function parameter list";
5170 } else if (this->type
->qualifier
.flags
.q
.out
) {
5172 extra
= " or in function parameter list";
5176 _mesa_glsl_error(& loc
, state
,
5177 "%s variable `%s' must be declared at "
5179 mode
, var
->name
, extra
);
5181 } else if (var
->data
.mode
== ir_var_shader_in
) {
5182 var
->data
.read_only
= true;
5184 if (state
->stage
== MESA_SHADER_VERTEX
) {
5185 bool error_emitted
= false;
5187 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
5189 * "Vertex shader inputs can only be float, floating-point
5190 * vectors, matrices, signed and unsigned integers and integer
5191 * vectors. Vertex shader inputs can also form arrays of these
5192 * types, but not structures."
5194 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
5196 * "Vertex shader inputs can only be float, floating-point
5197 * vectors, matrices, signed and unsigned integers and integer
5198 * vectors. They cannot be arrays or structures."
5200 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
5202 * "The attribute qualifier can be used only with float,
5203 * floating-point vectors, and matrices. Attribute variables
5204 * cannot be declared as arrays or structures."
5206 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
5208 * "Vertex shader inputs can only be float, floating-point
5209 * vectors, matrices, signed and unsigned integers and integer
5210 * vectors. Vertex shader inputs cannot be arrays or
5213 * From section 4.3.4 of the ARB_bindless_texture spec:
5215 * "(modify third paragraph of the section to allow sampler and
5216 * image types) ... Vertex shader inputs can only be float,
5217 * single-precision floating-point scalars, single-precision
5218 * floating-point vectors, matrices, signed and unsigned
5219 * integers and integer vectors, sampler and image types."
5221 const glsl_type
*check_type
= var
->type
->without_array();
5223 switch (check_type
->base_type
) {
5224 case GLSL_TYPE_FLOAT
:
5226 case GLSL_TYPE_UINT64
:
5227 case GLSL_TYPE_INT64
:
5229 case GLSL_TYPE_UINT
:
5231 if (state
->is_version(120, 300))
5233 case GLSL_TYPE_DOUBLE
:
5234 if (check_type
->is_double() && (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
5236 case GLSL_TYPE_SAMPLER
:
5237 if (check_type
->is_sampler() && state
->has_bindless())
5239 case GLSL_TYPE_IMAGE
:
5240 if (check_type
->is_image() && state
->has_bindless())
5244 _mesa_glsl_error(& loc
, state
,
5245 "vertex shader input / attribute cannot have "
5247 var
->type
->is_array() ? "array of " : "",
5249 error_emitted
= true;
5252 if (!error_emitted
&& var
->type
->is_array() &&
5253 !state
->check_version(150, 0, &loc
,
5254 "vertex shader input / attribute "
5255 "cannot have array type")) {
5256 error_emitted
= true;
5258 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
5259 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
5261 * Geometry shader input variables get the per-vertex values
5262 * written out by vertex shader output variables of the same
5263 * names. Since a geometry shader operates on a set of
5264 * vertices, each input varying variable (or input block, see
5265 * interface blocks below) needs to be declared as an array.
5267 if (!var
->type
->is_array()) {
5268 _mesa_glsl_error(&loc
, state
,
5269 "geometry shader inputs must be arrays");
5272 handle_geometry_shader_input_decl(state
, loc
, var
);
5273 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5274 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
5276 * It is a compile-time error to declare a fragment shader
5277 * input with, or that contains, any of the following types:
5281 * * An array of arrays
5282 * * An array of structures
5283 * * A structure containing an array
5284 * * A structure containing a structure
5286 if (state
->es_shader
) {
5287 const glsl_type
*check_type
= var
->type
->without_array();
5288 if (check_type
->is_boolean() ||
5289 check_type
->contains_opaque()) {
5290 _mesa_glsl_error(&loc
, state
,
5291 "fragment shader input cannot have type %s",
5294 if (var
->type
->is_array() &&
5295 var
->type
->fields
.array
->is_array()) {
5296 _mesa_glsl_error(&loc
, state
,
5298 "cannot have an array of arrays",
5299 _mesa_shader_stage_to_string(state
->stage
));
5301 if (var
->type
->is_array() &&
5302 var
->type
->fields
.array
->is_record()) {
5303 _mesa_glsl_error(&loc
, state
,
5304 "fragment shader input "
5305 "cannot have an array of structs");
5307 if (var
->type
->is_record()) {
5308 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5309 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5310 var
->type
->fields
.structure
[i
].type
->is_record())
5311 _mesa_glsl_error(&loc
, state
,
5312 "fragment shader input cannot have "
5313 "a struct that contains an "
5318 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5319 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5320 handle_tess_shader_input_decl(state
, loc
, var
);
5322 } else if (var
->data
.mode
== ir_var_shader_out
) {
5323 const glsl_type
*check_type
= var
->type
->without_array();
5325 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5327 * It is a compile-time error to declare a fragment shader output
5328 * that contains any of the following:
5330 * * A Boolean type (bool, bvec2 ...)
5331 * * A double-precision scalar or vector (double, dvec2 ...)
5336 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5337 if (check_type
->is_record() || check_type
->is_matrix())
5338 _mesa_glsl_error(&loc
, state
,
5339 "fragment shader output "
5340 "cannot have struct or matrix type");
5341 switch (check_type
->base_type
) {
5342 case GLSL_TYPE_UINT
:
5344 case GLSL_TYPE_FLOAT
:
5347 _mesa_glsl_error(&loc
, state
,
5348 "fragment shader output cannot have "
5349 "type %s", check_type
->name
);
5353 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5355 * It is a compile-time error to declare a vertex shader output
5356 * with, or that contains, any of the following types:
5360 * * An array of arrays
5361 * * An array of structures
5362 * * A structure containing an array
5363 * * A structure containing a structure
5365 * It is a compile-time error to declare a fragment shader output
5366 * with, or that contains, any of the following types:
5372 * * An array of array
5374 * ES 3.20 updates this to apply to tessellation and geometry shaders
5375 * as well. Because there are per-vertex arrays in the new stages,
5376 * it strikes the "array of..." rules and replaces them with these:
5378 * * For per-vertex-arrayed variables (applies to tessellation
5379 * control, tessellation evaluation and geometry shaders):
5381 * * Per-vertex-arrayed arrays of arrays
5382 * * Per-vertex-arrayed arrays of structures
5384 * * For non-per-vertex-arrayed variables:
5386 * * An array of arrays
5387 * * An array of structures
5389 * which basically says to unwrap the per-vertex aspect and apply
5392 if (state
->es_shader
) {
5393 if (var
->type
->is_array() &&
5394 var
->type
->fields
.array
->is_array()) {
5395 _mesa_glsl_error(&loc
, state
,
5397 "cannot have an array of arrays",
5398 _mesa_shader_stage_to_string(state
->stage
));
5400 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5401 const glsl_type
*type
= var
->type
;
5403 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5404 !var
->data
.patch
&& var
->type
->is_array()) {
5405 type
= var
->type
->fields
.array
;
5408 if (type
->is_array() && type
->fields
.array
->is_record()) {
5409 _mesa_glsl_error(&loc
, state
,
5410 "%s shader output cannot have "
5411 "an array of structs",
5412 _mesa_shader_stage_to_string(state
->stage
));
5414 if (type
->is_record()) {
5415 for (unsigned i
= 0; i
< type
->length
; i
++) {
5416 if (type
->fields
.structure
[i
].type
->is_array() ||
5417 type
->fields
.structure
[i
].type
->is_record())
5418 _mesa_glsl_error(&loc
, state
,
5419 "%s shader output cannot have a "
5420 "struct that contains an "
5422 _mesa_shader_stage_to_string(state
->stage
));
5428 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5429 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5431 } else if (var
->type
->contains_subroutine()) {
5432 /* declare subroutine uniforms as hidden */
5433 var
->data
.how_declared
= ir_var_hidden
;
5436 /* From section 4.3.4 of the GLSL 4.00 spec:
5437 * "Input variables may not be declared using the patch in qualifier
5438 * in tessellation control or geometry shaders."
5440 * From section 4.3.6 of the GLSL 4.00 spec:
5441 * "It is an error to use patch out in a vertex, tessellation
5442 * evaluation, or geometry shader."
5444 * This doesn't explicitly forbid using them in a fragment shader, but
5445 * that's probably just an oversight.
5447 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5448 && this->type
->qualifier
.flags
.q
.patch
5449 && this->type
->qualifier
.flags
.q
.in
) {
5451 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5452 "tessellation evaluation shader");
5455 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5456 && this->type
->qualifier
.flags
.q
.patch
5457 && this->type
->qualifier
.flags
.q
.out
) {
5459 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5460 "tessellation control shader");
5463 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5465 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5466 state
->check_precision_qualifiers_allowed(&loc
);
5469 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5470 !precision_qualifier_allowed(var
->type
)) {
5471 _mesa_glsl_error(&loc
, state
,
5472 "precision qualifiers apply only to floating point"
5473 ", integer and opaque types");
5476 /* From section 4.1.7 of the GLSL 4.40 spec:
5478 * "[Opaque types] can only be declared as function
5479 * parameters or uniform-qualified variables."
5481 * From section 4.1.7 of the ARB_bindless_texture spec:
5483 * "Samplers may be declared as shader inputs and outputs, as uniform
5484 * variables, as temporary variables, and as function parameters."
5486 * From section 4.1.X of the ARB_bindless_texture spec:
5488 * "Images may be declared as shader inputs and outputs, as uniform
5489 * variables, as temporary variables, and as function parameters."
5491 if (!this->type
->qualifier
.flags
.q
.uniform
&&
5492 (var_type
->contains_atomic() ||
5493 (!state
->has_bindless() && var_type
->contains_opaque()))) {
5494 _mesa_glsl_error(&loc
, state
,
5495 "%s variables must be declared uniform",
5496 state
->has_bindless() ? "atomic" : "opaque");
5499 /* Process the initializer and add its instructions to a temporary
5500 * list. This list will be added to the instruction stream (below) after
5501 * the declaration is added. This is done because in some cases (such as
5502 * redeclarations) the declaration may not actually be added to the
5503 * instruction stream.
5505 exec_list initializer_instructions
;
5507 /* Examine var name here since var may get deleted in the next call */
5508 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5510 bool is_redeclaration
;
5511 var
= get_variable_being_redeclared(&var
, decl
->get_location(), state
,
5512 false /* allow_all_redeclarations */,
5514 if (is_redeclaration
) {
5516 var
->data
.how_declared
== ir_var_declared_in_block
) {
5517 _mesa_glsl_error(&loc
, state
,
5518 "`%s' has already been redeclared using "
5519 "gl_PerVertex", var
->name
);
5521 var
->data
.how_declared
= ir_var_declared_normally
;
5524 if (decl
->initializer
!= NULL
) {
5525 result
= process_initializer(var
,
5527 &initializer_instructions
, state
);
5529 validate_array_dimensions(var_type
, state
, &loc
);
5532 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5534 * "It is an error to write to a const variable outside of
5535 * its declaration, so they must be initialized when
5538 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5539 _mesa_glsl_error(& loc
, state
,
5540 "const declaration of `%s' must be initialized",
5544 if (state
->es_shader
) {
5545 const glsl_type
*const t
= var
->type
;
5547 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5549 * The GL_OES_tessellation_shader spec says about inputs:
5551 * "Declaring an array size is optional. If no size is specified,
5552 * it will be taken from the implementation-dependent maximum
5553 * patch size (gl_MaxPatchVertices)."
5555 * and about TCS outputs:
5557 * "If no size is specified, it will be taken from output patch
5558 * size declared in the shader."
5560 * The GL_OES_geometry_shader spec says:
5562 * "All geometry shader input unsized array declarations will be
5563 * sized by an earlier input primitive layout qualifier, when
5564 * present, as per the following table."
5566 const bool implicitly_sized
=
5567 (var
->data
.mode
== ir_var_shader_in
&&
5568 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5569 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5570 (var
->data
.mode
== ir_var_shader_out
&&
5571 state
->stage
== MESA_SHADER_TESS_CTRL
);
5573 if (t
->is_unsized_array() && !implicitly_sized
)
5574 /* Section 10.17 of the GLSL ES 1.00 specification states that
5575 * unsized array declarations have been removed from the language.
5576 * Arrays that are sized using an initializer are still explicitly
5577 * sized. However, GLSL ES 1.00 does not allow array
5578 * initializers. That is only allowed in GLSL ES 3.00.
5580 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5582 * "An array type can also be formed without specifying a size
5583 * if the definition includes an initializer:
5585 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5586 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5591 _mesa_glsl_error(& loc
, state
,
5592 "unsized array declarations are not allowed in "
5596 /* Section 4.4.6.1 Atomic Counter Layout Qualifiers of the GLSL 4.60 spec:
5598 * "It is a compile-time error to declare an unsized array of
5601 if (var
->type
->is_unsized_array() &&
5602 var
->type
->without_array()->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
5603 _mesa_glsl_error(& loc
, state
,
5604 "Unsized array of atomic_uint is not allowed");
5607 /* If the declaration is not a redeclaration, there are a few additional
5608 * semantic checks that must be applied. In addition, variable that was
5609 * created for the declaration should be added to the IR stream.
5611 if (!is_redeclaration
) {
5612 validate_identifier(decl
->identifier
, loc
, state
);
5614 /* Add the variable to the symbol table. Note that the initializer's
5615 * IR was already processed earlier (though it hasn't been emitted
5616 * yet), without the variable in scope.
5618 * This differs from most C-like languages, but it follows the GLSL
5619 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5622 * "Within a declaration, the scope of a name starts immediately
5623 * after the initializer if present or immediately after the name
5624 * being declared if not."
5626 if (!state
->symbols
->add_variable(var
)) {
5627 YYLTYPE loc
= this->get_location();
5628 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5629 "current scope", decl
->identifier
);
5633 /* Push the variable declaration to the top. It means that all the
5634 * variable declarations will appear in a funny last-to-first order,
5635 * but otherwise we run into trouble if a function is prototyped, a
5636 * global var is decled, then the function is defined with usage of
5637 * the global var. See glslparsertest's CorrectModule.frag.
5639 instructions
->push_head(var
);
5642 instructions
->append_list(&initializer_instructions
);
5646 /* Generally, variable declarations do not have r-values. However,
5647 * one is used for the declaration in
5649 * while (bool b = some_condition()) {
5653 * so we return the rvalue from the last seen declaration here.
5660 ast_parameter_declarator::hir(exec_list
*instructions
,
5661 struct _mesa_glsl_parse_state
*state
)
5664 const struct glsl_type
*type
;
5665 const char *name
= NULL
;
5666 YYLTYPE loc
= this->get_location();
5668 type
= this->type
->glsl_type(& name
, state
);
5672 _mesa_glsl_error(& loc
, state
,
5673 "invalid type `%s' in declaration of `%s'",
5674 name
, this->identifier
);
5676 _mesa_glsl_error(& loc
, state
,
5677 "invalid type in declaration of `%s'",
5681 type
= glsl_type::error_type
;
5684 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5686 * "Functions that accept no input arguments need not use void in the
5687 * argument list because prototypes (or definitions) are required and
5688 * therefore there is no ambiguity when an empty argument list "( )" is
5689 * declared. The idiom "(void)" as a parameter list is provided for
5692 * Placing this check here prevents a void parameter being set up
5693 * for a function, which avoids tripping up checks for main taking
5694 * parameters and lookups of an unnamed symbol.
5696 if (type
->is_void()) {
5697 if (this->identifier
!= NULL
)
5698 _mesa_glsl_error(& loc
, state
,
5699 "named parameter cannot have type `void'");
5705 if (formal_parameter
&& (this->identifier
== NULL
)) {
5706 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5710 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5711 * call already handled the "vec4[..] foo" case.
5713 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5715 if (!type
->is_error() && type
->is_unsized_array()) {
5716 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5718 type
= glsl_type::error_type
;
5722 ir_variable
*var
= new(ctx
)
5723 ir_variable(type
, this->identifier
, ir_var_function_in
);
5725 /* Apply any specified qualifiers to the parameter declaration. Note that
5726 * for function parameters the default mode is 'in'.
5728 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5731 /* From section 4.1.7 of the GLSL 4.40 spec:
5733 * "Opaque variables cannot be treated as l-values; hence cannot
5734 * be used as out or inout function parameters, nor can they be
5737 * From section 4.1.7 of the ARB_bindless_texture spec:
5739 * "Samplers can be used as l-values, so can be assigned into and used
5740 * as "out" and "inout" function parameters."
5742 * From section 4.1.X of the ARB_bindless_texture spec:
5744 * "Images can be used as l-values, so can be assigned into and used as
5745 * "out" and "inout" function parameters."
5747 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5748 && (type
->contains_atomic() ||
5749 (!state
->has_bindless() && type
->contains_opaque()))) {
5750 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5751 "contain %s variables",
5752 state
->has_bindless() ? "atomic" : "opaque");
5753 type
= glsl_type::error_type
;
5756 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5758 * "When calling a function, expressions that do not evaluate to
5759 * l-values cannot be passed to parameters declared as out or inout."
5761 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5763 * "Other binary or unary expressions, non-dereferenced arrays,
5764 * function names, swizzles with repeated fields, and constants
5765 * cannot be l-values."
5767 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5768 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5770 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5772 && !state
->check_version(120, 100, &loc
,
5773 "arrays cannot be out or inout parameters")) {
5774 type
= glsl_type::error_type
;
5777 instructions
->push_tail(var
);
5779 /* Parameter declarations do not have r-values.
5786 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5788 exec_list
*ir_parameters
,
5789 _mesa_glsl_parse_state
*state
)
5791 ast_parameter_declarator
*void_param
= NULL
;
5794 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5795 param
->formal_parameter
= formal
;
5796 param
->hir(ir_parameters
, state
);
5804 if ((void_param
!= NULL
) && (count
> 1)) {
5805 YYLTYPE loc
= void_param
->get_location();
5807 _mesa_glsl_error(& loc
, state
,
5808 "`void' parameter must be only parameter");
5814 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5816 /* IR invariants disallow function declarations or definitions
5817 * nested within other function definitions. But there is no
5818 * requirement about the relative order of function declarations
5819 * and definitions with respect to one another. So simply insert
5820 * the new ir_function block at the end of the toplevel instruction
5823 state
->toplevel_ir
->push_tail(f
);
5828 ast_function::hir(exec_list
*instructions
,
5829 struct _mesa_glsl_parse_state
*state
)
5832 ir_function
*f
= NULL
;
5833 ir_function_signature
*sig
= NULL
;
5834 exec_list hir_parameters
;
5835 YYLTYPE loc
= this->get_location();
5837 const char *const name
= identifier
;
5839 /* New functions are always added to the top-level IR instruction stream,
5840 * so this instruction list pointer is ignored. See also emit_function
5843 (void) instructions
;
5845 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5847 * "Function declarations (prototypes) cannot occur inside of functions;
5848 * they must be at global scope, or for the built-in functions, outside
5849 * the global scope."
5851 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5853 * "User defined functions may only be defined within the global scope."
5855 * Note that this language does not appear in GLSL 1.10.
5857 if ((state
->current_function
!= NULL
) &&
5858 state
->is_version(120, 100)) {
5859 YYLTYPE loc
= this->get_location();
5860 _mesa_glsl_error(&loc
, state
,
5861 "declaration of function `%s' not allowed within "
5862 "function body", name
);
5865 validate_identifier(name
, this->get_location(), state
);
5867 /* Convert the list of function parameters to HIR now so that they can be
5868 * used below to compare this function's signature with previously seen
5869 * signatures for functions with the same name.
5871 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5873 & hir_parameters
, state
);
5875 const char *return_type_name
;
5876 const glsl_type
*return_type
=
5877 this->return_type
->glsl_type(& return_type_name
, state
);
5880 YYLTYPE loc
= this->get_location();
5881 _mesa_glsl_error(&loc
, state
,
5882 "function `%s' has undeclared return type `%s'",
5883 name
, return_type_name
);
5884 return_type
= glsl_type::error_type
;
5887 /* ARB_shader_subroutine states:
5888 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5889 * subroutine(...) to a function declaration."
5891 if (this->return_type
->qualifier
.subroutine_list
&& !is_definition
) {
5892 YYLTYPE loc
= this->get_location();
5893 _mesa_glsl_error(&loc
, state
,
5894 "function declaration `%s' cannot have subroutine prepended",
5898 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5899 * "No qualifier is allowed on the return type of a function."
5901 if (this->return_type
->has_qualifiers(state
)) {
5902 YYLTYPE loc
= this->get_location();
5903 _mesa_glsl_error(& loc
, state
,
5904 "function `%s' return type has qualifiers", name
);
5907 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5909 * "Arrays are allowed as arguments and as the return type. In both
5910 * cases, the array must be explicitly sized."
5912 if (return_type
->is_unsized_array()) {
5913 YYLTYPE loc
= this->get_location();
5914 _mesa_glsl_error(& loc
, state
,
5915 "function `%s' return type array must be explicitly "
5919 /* From Section 6.1 (Function Definitions) of the GLSL 1.00 spec:
5921 * "Arrays are allowed as arguments, but not as the return type. [...]
5922 * The return type can also be a structure if the structure does not
5923 * contain an array."
5925 if (state
->language_version
== 100 && return_type
->contains_array()) {
5926 YYLTYPE loc
= this->get_location();
5927 _mesa_glsl_error(& loc
, state
,
5928 "function `%s' return type contains an array", name
);
5931 /* From section 4.1.7 of the GLSL 4.40 spec:
5933 * "[Opaque types] can only be declared as function parameters
5934 * or uniform-qualified variables."
5936 * The ARB_bindless_texture spec doesn't clearly state this, but as it says
5937 * "Replace Section 4.1.7 (Samplers), p. 25" and, "Replace Section 4.1.X,
5938 * (Images)", this should be allowed.
5940 if (return_type
->contains_atomic() ||
5941 (!state
->has_bindless() && return_type
->contains_opaque())) {
5942 YYLTYPE loc
= this->get_location();
5943 _mesa_glsl_error(&loc
, state
,
5944 "function `%s' return type can't contain an %s type",
5945 name
, state
->has_bindless() ? "atomic" : "opaque");
5949 if (return_type
->is_subroutine()) {
5950 YYLTYPE loc
= this->get_location();
5951 _mesa_glsl_error(&loc
, state
,
5952 "function `%s' return type can't be a subroutine type",
5957 /* Create an ir_function if one doesn't already exist. */
5958 f
= state
->symbols
->get_function(name
);
5960 f
= new(ctx
) ir_function(name
);
5961 if (!this->return_type
->qualifier
.is_subroutine_decl()) {
5962 if (!state
->symbols
->add_function(f
)) {
5963 /* This function name shadows a non-function use of the same name. */
5964 YYLTYPE loc
= this->get_location();
5965 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5966 "non-function", name
);
5970 emit_function(state
, f
);
5973 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5975 * "A shader cannot redefine or overload built-in functions."
5977 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5979 * "User code can overload the built-in functions but cannot redefine
5982 if (state
->es_shader
) {
5983 /* Local shader has no exact candidates; check the built-ins. */
5984 _mesa_glsl_initialize_builtin_functions();
5985 if (state
->language_version
>= 300 &&
5986 _mesa_glsl_has_builtin_function(state
, name
)) {
5987 YYLTYPE loc
= this->get_location();
5988 _mesa_glsl_error(& loc
, state
,
5989 "A shader cannot redefine or overload built-in "
5990 "function `%s' in GLSL ES 3.00", name
);
5994 if (state
->language_version
== 100) {
5995 ir_function_signature
*sig
=
5996 _mesa_glsl_find_builtin_function(state
, name
, &hir_parameters
);
5997 if (sig
&& sig
->is_builtin()) {
5998 _mesa_glsl_error(& loc
, state
,
5999 "A shader cannot redefine built-in "
6000 "function `%s' in GLSL ES 1.00", name
);
6005 /* Verify that this function's signature either doesn't match a previously
6006 * seen signature for a function with the same name, or, if a match is found,
6007 * that the previously seen signature does not have an associated definition.
6009 if (state
->es_shader
|| f
->has_user_signature()) {
6010 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
6012 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
6013 if (badvar
!= NULL
) {
6014 YYLTYPE loc
= this->get_location();
6016 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
6017 "qualifiers don't match prototype", name
, badvar
);
6020 if (sig
->return_type
!= return_type
) {
6021 YYLTYPE loc
= this->get_location();
6023 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
6024 "match prototype", name
);
6027 if (sig
->is_defined
) {
6028 if (is_definition
) {
6029 YYLTYPE loc
= this->get_location();
6030 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
6032 /* We just encountered a prototype that exactly matches a
6033 * function that's already been defined. This is redundant,
6034 * and we should ignore it.
6038 } else if (state
->language_version
== 100 && !is_definition
) {
6039 /* From the GLSL 1.00 spec, section 4.2.7:
6041 * "A particular variable, structure or function declaration
6042 * may occur at most once within a scope with the exception
6043 * that a single function prototype plus the corresponding
6044 * function definition are allowed."
6046 YYLTYPE loc
= this->get_location();
6047 _mesa_glsl_error(&loc
, state
, "function `%s' redeclared", name
);
6052 /* Verify the return type of main() */
6053 if (strcmp(name
, "main") == 0) {
6054 if (! return_type
->is_void()) {
6055 YYLTYPE loc
= this->get_location();
6057 _mesa_glsl_error(& loc
, state
, "main() must return void");
6060 if (!hir_parameters
.is_empty()) {
6061 YYLTYPE loc
= this->get_location();
6063 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
6067 /* Finish storing the information about this new function in its signature.
6070 sig
= new(ctx
) ir_function_signature(return_type
);
6071 f
->add_signature(sig
);
6074 sig
->replace_parameters(&hir_parameters
);
6077 if (this->return_type
->qualifier
.subroutine_list
) {
6080 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
6081 unsigned qual_index
;
6082 if (process_qualifier_constant(state
, &loc
, "index",
6083 this->return_type
->qualifier
.index
,
6085 if (!state
->has_explicit_uniform_location()) {
6086 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
6087 "GL_ARB_explicit_uniform_location or "
6089 } else if (qual_index
>= MAX_SUBROUTINES
) {
6090 _mesa_glsl_error(&loc
, state
,
6091 "invalid subroutine index (%d) index must "
6092 "be a number between 0 and "
6093 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
6094 MAX_SUBROUTINES
- 1);
6096 f
->subroutine_index
= qual_index
;
6101 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
6102 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
6103 f
->num_subroutine_types
);
6105 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
6106 const struct glsl_type
*type
;
6107 /* the subroutine type must be already declared */
6108 type
= state
->symbols
->get_type(decl
->identifier
);
6110 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
6113 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
6114 ir_function
*fn
= state
->subroutine_types
[i
];
6115 ir_function_signature
*tsig
= NULL
;
6117 if (strcmp(fn
->name
, decl
->identifier
))
6120 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
6123 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
6125 if (tsig
->return_type
!= sig
->return_type
) {
6126 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
6130 f
->subroutine_types
[idx
++] = type
;
6132 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
6134 state
->num_subroutines
+ 1);
6135 state
->subroutines
[state
->num_subroutines
] = f
;
6136 state
->num_subroutines
++;
6140 if (this->return_type
->qualifier
.is_subroutine_decl()) {
6141 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
6142 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
6145 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
6147 state
->num_subroutine_types
+ 1);
6148 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
6149 state
->num_subroutine_types
++;
6151 f
->is_subroutine
= true;
6154 /* Function declarations (prototypes) do not have r-values.
6161 ast_function_definition::hir(exec_list
*instructions
,
6162 struct _mesa_glsl_parse_state
*state
)
6164 prototype
->is_definition
= true;
6165 prototype
->hir(instructions
, state
);
6167 ir_function_signature
*signature
= prototype
->signature
;
6168 if (signature
== NULL
)
6171 assert(state
->current_function
== NULL
);
6172 state
->current_function
= signature
;
6173 state
->found_return
= false;
6175 /* Duplicate parameters declared in the prototype as concrete variables.
6176 * Add these to the symbol table.
6178 state
->symbols
->push_scope();
6179 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
6180 assert(var
->as_variable() != NULL
);
6182 /* The only way a parameter would "exist" is if two parameters have
6185 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
6186 YYLTYPE loc
= this->get_location();
6188 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
6190 state
->symbols
->add_variable(var
);
6194 /* Convert the body of the function to HIR. */
6195 this->body
->hir(&signature
->body
, state
);
6196 signature
->is_defined
= true;
6198 state
->symbols
->pop_scope();
6200 assert(state
->current_function
== signature
);
6201 state
->current_function
= NULL
;
6203 if (!signature
->return_type
->is_void() && !state
->found_return
) {
6204 YYLTYPE loc
= this->get_location();
6205 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
6206 "%s, but no return statement",
6207 signature
->function_name(),
6208 signature
->return_type
->name
);
6211 /* Function definitions do not have r-values.
6218 ast_jump_statement::hir(exec_list
*instructions
,
6219 struct _mesa_glsl_parse_state
*state
)
6226 assert(state
->current_function
);
6228 if (opt_return_value
) {
6229 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
6231 /* The value of the return type can be NULL if the shader says
6232 * 'return foo();' and foo() is a function that returns void.
6234 * NOTE: The GLSL spec doesn't say that this is an error. The type
6235 * of the return value is void. If the return type of the function is
6236 * also void, then this should compile without error. Seriously.
6238 const glsl_type
*const ret_type
=
6239 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
6241 /* Implicit conversions are not allowed for return values prior to
6242 * ARB_shading_language_420pack.
6244 if (state
->current_function
->return_type
!= ret_type
) {
6245 YYLTYPE loc
= this->get_location();
6247 if (state
->has_420pack()) {
6248 if (!apply_implicit_conversion(state
->current_function
->return_type
,
6250 _mesa_glsl_error(& loc
, state
,
6251 "could not implicitly convert return value "
6252 "to %s, in function `%s'",
6253 state
->current_function
->return_type
->name
,
6254 state
->current_function
->function_name());
6257 _mesa_glsl_error(& loc
, state
,
6258 "`return' with wrong type %s, in function `%s' "
6261 state
->current_function
->function_name(),
6262 state
->current_function
->return_type
->name
);
6264 } else if (state
->current_function
->return_type
->base_type
==
6266 YYLTYPE loc
= this->get_location();
6268 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
6269 * specs add a clarification:
6271 * "A void function can only use return without a return argument, even if
6272 * the return argument has void type. Return statements only accept values:
6275 * void func2() { return func1(); } // illegal return statement"
6277 _mesa_glsl_error(& loc
, state
,
6278 "void functions can only use `return' without a "
6282 inst
= new(ctx
) ir_return(ret
);
6284 if (state
->current_function
->return_type
->base_type
!=
6286 YYLTYPE loc
= this->get_location();
6288 _mesa_glsl_error(& loc
, state
,
6289 "`return' with no value, in function %s returning "
6291 state
->current_function
->function_name());
6293 inst
= new(ctx
) ir_return
;
6296 state
->found_return
= true;
6297 instructions
->push_tail(inst
);
6302 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
6303 YYLTYPE loc
= this->get_location();
6305 _mesa_glsl_error(& loc
, state
,
6306 "`discard' may only appear in a fragment shader");
6308 instructions
->push_tail(new(ctx
) ir_discard
);
6313 if (mode
== ast_continue
&&
6314 state
->loop_nesting_ast
== NULL
) {
6315 YYLTYPE loc
= this->get_location();
6317 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
6318 } else if (mode
== ast_break
&&
6319 state
->loop_nesting_ast
== NULL
&&
6320 state
->switch_state
.switch_nesting_ast
== NULL
) {
6321 YYLTYPE loc
= this->get_location();
6323 _mesa_glsl_error(& loc
, state
,
6324 "break may only appear in a loop or a switch");
6326 /* For a loop, inline the for loop expression again, since we don't
6327 * know where near the end of the loop body the normal copy of it is
6328 * going to be placed. Same goes for the condition for a do-while
6331 if (state
->loop_nesting_ast
!= NULL
&&
6332 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
6333 if (state
->loop_nesting_ast
->rest_expression
) {
6334 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
6337 if (state
->loop_nesting_ast
->mode
==
6338 ast_iteration_statement::ast_do_while
) {
6339 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
6343 if (state
->switch_state
.is_switch_innermost
&&
6344 mode
== ast_continue
) {
6345 /* Set 'continue_inside' to true. */
6346 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
6347 ir_dereference_variable
*deref_continue_inside_var
=
6348 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6349 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6352 /* Break out from the switch, continue for the loop will
6353 * be called right after switch. */
6354 ir_loop_jump
*const jump
=
6355 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6356 instructions
->push_tail(jump
);
6358 } else if (state
->switch_state
.is_switch_innermost
&&
6359 mode
== ast_break
) {
6360 /* Force break out of switch by inserting a break. */
6361 ir_loop_jump
*const jump
=
6362 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6363 instructions
->push_tail(jump
);
6365 ir_loop_jump
*const jump
=
6366 new(ctx
) ir_loop_jump((mode
== ast_break
)
6367 ? ir_loop_jump::jump_break
6368 : ir_loop_jump::jump_continue
);
6369 instructions
->push_tail(jump
);
6376 /* Jump instructions do not have r-values.
6383 ast_selection_statement::hir(exec_list
*instructions
,
6384 struct _mesa_glsl_parse_state
*state
)
6388 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6390 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6392 * "Any expression whose type evaluates to a Boolean can be used as the
6393 * conditional expression bool-expression. Vector types are not accepted
6394 * as the expression to if."
6396 * The checks are separated so that higher quality diagnostics can be
6397 * generated for cases where both rules are violated.
6399 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6400 YYLTYPE loc
= this->condition
->get_location();
6402 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6406 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6408 if (then_statement
!= NULL
) {
6409 state
->symbols
->push_scope();
6410 then_statement
->hir(& stmt
->then_instructions
, state
);
6411 state
->symbols
->pop_scope();
6414 if (else_statement
!= NULL
) {
6415 state
->symbols
->push_scope();
6416 else_statement
->hir(& stmt
->else_instructions
, state
);
6417 state
->symbols
->pop_scope();
6420 instructions
->push_tail(stmt
);
6422 /* if-statements do not have r-values.
6429 /** Value of the case label. */
6432 /** Does this label occur after the default? */
6436 * AST for the case label.
6438 * This is only used to generate error messages for duplicate labels.
6440 ast_expression
*ast
;
6443 /* Used for detection of duplicate case values, compare
6444 * given contents directly.
6447 compare_case_value(const void *a
, const void *b
)
6449 return ((struct case_label
*) a
)->value
== ((struct case_label
*) b
)->value
;
6453 /* Used for detection of duplicate case values, just
6454 * returns key contents as is.
6457 key_contents(const void *key
)
6459 return ((struct case_label
*) key
)->value
;
6464 ast_switch_statement::hir(exec_list
*instructions
,
6465 struct _mesa_glsl_parse_state
*state
)
6469 ir_rvalue
*const test_expression
=
6470 this->test_expression
->hir(instructions
, state
);
6472 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6474 * "The type of init-expression in a switch statement must be a
6477 if (!test_expression
->type
->is_scalar() ||
6478 !test_expression
->type
->is_integer()) {
6479 YYLTYPE loc
= this->test_expression
->get_location();
6481 _mesa_glsl_error(& loc
,
6483 "switch-statement expression must be scalar "
6488 /* Track the switch-statement nesting in a stack-like manner.
6490 struct glsl_switch_state saved
= state
->switch_state
;
6492 state
->switch_state
.is_switch_innermost
= true;
6493 state
->switch_state
.switch_nesting_ast
= this;
6494 state
->switch_state
.labels_ht
=
6495 _mesa_hash_table_create(NULL
, key_contents
,
6496 compare_case_value
);
6497 state
->switch_state
.previous_default
= NULL
;
6499 /* Initalize is_fallthru state to false.
6501 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6502 state
->switch_state
.is_fallthru_var
=
6503 new(ctx
) ir_variable(glsl_type::bool_type
,
6504 "switch_is_fallthru_tmp",
6506 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6508 ir_dereference_variable
*deref_is_fallthru_var
=
6509 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6510 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6513 /* Initialize continue_inside state to false.
6515 state
->switch_state
.continue_inside
=
6516 new(ctx
) ir_variable(glsl_type::bool_type
,
6517 "continue_inside_tmp",
6519 instructions
->push_tail(state
->switch_state
.continue_inside
);
6521 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6522 ir_dereference_variable
*deref_continue_inside_var
=
6523 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6524 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6527 state
->switch_state
.run_default
=
6528 new(ctx
) ir_variable(glsl_type::bool_type
,
6531 instructions
->push_tail(state
->switch_state
.run_default
);
6533 /* Loop around the switch is used for flow control. */
6534 ir_loop
* loop
= new(ctx
) ir_loop();
6535 instructions
->push_tail(loop
);
6537 /* Cache test expression.
6539 test_to_hir(&loop
->body_instructions
, state
);
6541 /* Emit code for body of switch stmt.
6543 body
->hir(&loop
->body_instructions
, state
);
6545 /* Insert a break at the end to exit loop. */
6546 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6547 loop
->body_instructions
.push_tail(jump
);
6549 /* If we are inside loop, check if continue got called inside switch. */
6550 if (state
->loop_nesting_ast
!= NULL
) {
6551 ir_dereference_variable
*deref_continue_inside
=
6552 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6553 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6554 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6556 if (state
->loop_nesting_ast
!= NULL
) {
6557 if (state
->loop_nesting_ast
->rest_expression
) {
6558 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6561 if (state
->loop_nesting_ast
->mode
==
6562 ast_iteration_statement::ast_do_while
) {
6563 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6566 irif
->then_instructions
.push_tail(jump
);
6567 instructions
->push_tail(irif
);
6570 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6572 state
->switch_state
= saved
;
6574 /* Switch statements do not have r-values. */
6580 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6581 struct _mesa_glsl_parse_state
*state
)
6585 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6586 * on the switch test case. The first one would be already raised when
6587 * getting the test_expression at ast_switch_statement::hir
6589 test_expression
->set_is_lhs(true);
6590 /* Cache value of test expression. */
6591 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6593 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6596 ir_dereference_variable
*deref_test_var
=
6597 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6599 instructions
->push_tail(state
->switch_state
.test_var
);
6600 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6605 ast_switch_body::hir(exec_list
*instructions
,
6606 struct _mesa_glsl_parse_state
*state
)
6609 stmts
->hir(instructions
, state
);
6611 /* Switch bodies do not have r-values. */
6616 ast_case_statement_list::hir(exec_list
*instructions
,
6617 struct _mesa_glsl_parse_state
*state
)
6619 exec_list default_case
, after_default
, tmp
;
6621 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6622 case_stmt
->hir(&tmp
, state
);
6625 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6626 default_case
.append_list(&tmp
);
6630 /* If default case found, append 'after_default' list. */
6631 if (!default_case
.is_empty())
6632 after_default
.append_list(&tmp
);
6634 instructions
->append_list(&tmp
);
6637 /* Handle the default case. This is done here because default might not be
6638 * the last case. We need to add checks against following cases first to see
6639 * if default should be chosen or not.
6641 if (!default_case
.is_empty()) {
6642 struct hash_entry
*entry
;
6643 ir_factory
body(instructions
, state
);
6645 ir_expression
*cmp
= NULL
;
6647 hash_table_foreach(state
->switch_state
.labels_ht
, entry
) {
6648 const struct case_label
*const l
= (struct case_label
*) entry
->data
;
6650 /* If the switch init-value is the value of one of the labels that
6651 * occurs after the default case, disable execution of the default
6654 if (l
->after_default
) {
6655 ir_constant
*const cnst
=
6656 state
->switch_state
.test_var
->type
->base_type
== GLSL_TYPE_UINT
6657 ? body
.constant(unsigned(l
->value
))
6658 : body
.constant(int(l
->value
));
6661 ? equal(cnst
, state
->switch_state
.test_var
)
6662 : logic_or(cmp
, equal(cnst
, state
->switch_state
.test_var
));
6667 body
.emit(assign(state
->switch_state
.run_default
, logic_not(cmp
)));
6669 body
.emit(assign(state
->switch_state
.run_default
, body
.constant(true)));
6671 /* Append default case and all cases after it. */
6672 instructions
->append_list(&default_case
);
6673 instructions
->append_list(&after_default
);
6676 /* Case statements do not have r-values. */
6681 ast_case_statement::hir(exec_list
*instructions
,
6682 struct _mesa_glsl_parse_state
*state
)
6684 labels
->hir(instructions
, state
);
6686 /* Guard case statements depending on fallthru state. */
6687 ir_dereference_variable
*const deref_fallthru_guard
=
6688 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6689 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6691 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6692 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6694 instructions
->push_tail(test_fallthru
);
6696 /* Case statements do not have r-values. */
6702 ast_case_label_list::hir(exec_list
*instructions
,
6703 struct _mesa_glsl_parse_state
*state
)
6705 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6706 label
->hir(instructions
, state
);
6708 /* Case labels do not have r-values. */
6713 ast_case_label::hir(exec_list
*instructions
,
6714 struct _mesa_glsl_parse_state
*state
)
6716 ir_factory
body(instructions
, state
);
6718 ir_variable
*const fallthru_var
= state
->switch_state
.is_fallthru_var
;
6720 /* If not default case, ... */
6721 if (this->test_value
!= NULL
) {
6722 /* Conditionally set fallthru state based on
6723 * comparison of cached test expression value to case label.
6725 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6726 ir_constant
*label_const
=
6727 label_rval
->constant_expression_value(body
.mem_ctx
);
6730 YYLTYPE loc
= this->test_value
->get_location();
6732 _mesa_glsl_error(& loc
, state
,
6733 "switch statement case label must be a "
6734 "constant expression");
6736 /* Stuff a dummy value in to allow processing to continue. */
6737 label_const
= body
.constant(0);
6740 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6741 &label_const
->value
.u
[0]);
6744 const struct case_label
*const l
=
6745 (struct case_label
*) entry
->data
;
6746 const ast_expression
*const previous_label
= l
->ast
;
6747 YYLTYPE loc
= this->test_value
->get_location();
6749 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6751 loc
= previous_label
->get_location();
6752 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6754 struct case_label
*l
= ralloc(state
->switch_state
.labels_ht
,
6757 l
->value
= label_const
->value
.u
[0];
6758 l
->after_default
= state
->switch_state
.previous_default
!= NULL
;
6759 l
->ast
= this->test_value
;
6761 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6762 &label_const
->value
.u
[0],
6767 /* Create an r-value version of the ir_constant label here (after we may
6768 * have created a fake one in error cases) that can be passed to
6769 * apply_implicit_conversion below.
6771 ir_rvalue
*label
= label_const
;
6773 ir_rvalue
*deref_test_var
=
6774 new(body
.mem_ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6777 * From GLSL 4.40 specification section 6.2 ("Selection"):
6779 * "The type of the init-expression value in a switch statement must
6780 * be a scalar int or uint. The type of the constant-expression value
6781 * in a case label also must be a scalar int or uint. When any pair
6782 * of these values is tested for "equal value" and the types do not
6783 * match, an implicit conversion will be done to convert the int to a
6784 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6787 if (label
->type
!= state
->switch_state
.test_var
->type
) {
6788 YYLTYPE loc
= this->test_value
->get_location();
6790 const glsl_type
*type_a
= label
->type
;
6791 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6793 /* Check if int->uint implicit conversion is supported. */
6794 bool integer_conversion_supported
=
6795 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6798 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6799 !integer_conversion_supported
) {
6800 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6801 "init-expression and case label (%s != %s)",
6802 type_a
->name
, type_b
->name
);
6804 /* Conversion of the case label. */
6805 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6806 if (!apply_implicit_conversion(glsl_type::uint_type
,
6808 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6810 /* Conversion of the init-expression value. */
6811 if (!apply_implicit_conversion(glsl_type::uint_type
,
6812 deref_test_var
, state
))
6813 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6817 /* If the implicit conversion was allowed, the types will already be
6818 * the same. If the implicit conversion wasn't allowed, smash the
6819 * type of the label anyway. This will prevent the expression
6820 * constructor (below) from failing an assertion.
6822 label
->type
= deref_test_var
->type
;
6825 body
.emit(assign(fallthru_var
,
6826 logic_or(fallthru_var
, equal(label
, deref_test_var
))));
6827 } else { /* default case */
6828 if (state
->switch_state
.previous_default
) {
6829 YYLTYPE loc
= this->get_location();
6830 _mesa_glsl_error(& loc
, state
,
6831 "multiple default labels in one switch");
6833 loc
= state
->switch_state
.previous_default
->get_location();
6834 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6836 state
->switch_state
.previous_default
= this;
6838 /* Set fallthru condition on 'run_default' bool. */
6839 body
.emit(assign(fallthru_var
,
6840 logic_or(fallthru_var
,
6841 state
->switch_state
.run_default
)));
6844 /* Case statements do not have r-values. */
6849 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6850 struct _mesa_glsl_parse_state
*state
)
6854 if (condition
!= NULL
) {
6855 ir_rvalue
*const cond
=
6856 condition
->hir(instructions
, state
);
6859 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6860 YYLTYPE loc
= condition
->get_location();
6862 _mesa_glsl_error(& loc
, state
,
6863 "loop condition must be scalar boolean");
6865 /* As the first code in the loop body, generate a block that looks
6866 * like 'if (!condition) break;' as the loop termination condition.
6868 ir_rvalue
*const not_cond
=
6869 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6871 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6873 ir_jump
*const break_stmt
=
6874 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6876 if_stmt
->then_instructions
.push_tail(break_stmt
);
6877 instructions
->push_tail(if_stmt
);
6884 ast_iteration_statement::hir(exec_list
*instructions
,
6885 struct _mesa_glsl_parse_state
*state
)
6889 /* For-loops and while-loops start a new scope, but do-while loops do not.
6891 if (mode
!= ast_do_while
)
6892 state
->symbols
->push_scope();
6894 if (init_statement
!= NULL
)
6895 init_statement
->hir(instructions
, state
);
6897 ir_loop
*const stmt
= new(ctx
) ir_loop();
6898 instructions
->push_tail(stmt
);
6900 /* Track the current loop nesting. */
6901 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6903 state
->loop_nesting_ast
= this;
6905 /* Likewise, indicate that following code is closest to a loop,
6906 * NOT closest to a switch.
6908 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6909 state
->switch_state
.is_switch_innermost
= false;
6911 if (mode
!= ast_do_while
)
6912 condition_to_hir(&stmt
->body_instructions
, state
);
6915 body
->hir(& stmt
->body_instructions
, state
);
6917 if (rest_expression
!= NULL
)
6918 rest_expression
->hir(& stmt
->body_instructions
, state
);
6920 if (mode
== ast_do_while
)
6921 condition_to_hir(&stmt
->body_instructions
, state
);
6923 if (mode
!= ast_do_while
)
6924 state
->symbols
->pop_scope();
6926 /* Restore previous nesting before returning. */
6927 state
->loop_nesting_ast
= nesting_ast
;
6928 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6930 /* Loops do not have r-values.
6937 * Determine if the given type is valid for establishing a default precision
6940 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6942 * "The precision statement
6944 * precision precision-qualifier type;
6946 * can be used to establish a default precision qualifier. The type field
6947 * can be either int or float or any of the sampler types, and the
6948 * precision-qualifier can be lowp, mediump, or highp."
6950 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6951 * qualifiers on sampler types, but this seems like an oversight (since the
6952 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6953 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6957 is_valid_default_precision_type(const struct glsl_type
*const type
)
6962 switch (type
->base_type
) {
6964 case GLSL_TYPE_FLOAT
:
6965 /* "int" and "float" are valid, but vectors and matrices are not. */
6966 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6967 case GLSL_TYPE_SAMPLER
:
6968 case GLSL_TYPE_IMAGE
:
6969 case GLSL_TYPE_ATOMIC_UINT
:
6978 ast_type_specifier::hir(exec_list
*instructions
,
6979 struct _mesa_glsl_parse_state
*state
)
6981 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6984 YYLTYPE loc
= this->get_location();
6986 /* If this is a precision statement, check that the type to which it is
6987 * applied is either float or int.
6989 * From section 4.5.3 of the GLSL 1.30 spec:
6990 * "The precision statement
6991 * precision precision-qualifier type;
6992 * can be used to establish a default precision qualifier. The type
6993 * field can be either int or float [...]. Any other types or
6994 * qualifiers will result in an error.
6996 if (this->default_precision
!= ast_precision_none
) {
6997 if (!state
->check_precision_qualifiers_allowed(&loc
))
7000 if (this->structure
!= NULL
) {
7001 _mesa_glsl_error(&loc
, state
,
7002 "precision qualifiers do not apply to structures");
7006 if (this->array_specifier
!= NULL
) {
7007 _mesa_glsl_error(&loc
, state
,
7008 "default precision statements do not apply to "
7013 const struct glsl_type
*const type
=
7014 state
->symbols
->get_type(this->type_name
);
7015 if (!is_valid_default_precision_type(type
)) {
7016 _mesa_glsl_error(&loc
, state
,
7017 "default precision statements apply only to "
7018 "float, int, and opaque types");
7022 if (state
->es_shader
) {
7023 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
7026 * "Non-precision qualified declarations will use the precision
7027 * qualifier specified in the most recent precision statement
7028 * that is still in scope. The precision statement has the same
7029 * scoping rules as variable declarations. If it is declared
7030 * inside a compound statement, its effect stops at the end of
7031 * the innermost statement it was declared in. Precision
7032 * statements in nested scopes override precision statements in
7033 * outer scopes. Multiple precision statements for the same basic
7034 * type can appear inside the same scope, with later statements
7035 * overriding earlier statements within that scope."
7037 * Default precision specifications follow the same scope rules as
7038 * variables. So, we can track the state of the default precision
7039 * qualifiers in the symbol table, and the rules will just work. This
7040 * is a slight abuse of the symbol table, but it has the semantics
7043 state
->symbols
->add_default_precision_qualifier(this->type_name
,
7044 this->default_precision
);
7047 /* FINISHME: Translate precision statements into IR. */
7051 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
7052 * process_record_constructor() can do type-checking on C-style initializer
7053 * expressions of structs, but ast_struct_specifier should only be translated
7054 * to HIR if it is declaring the type of a structure.
7056 * The ->is_declaration field is false for initializers of variables
7057 * declared separately from the struct's type definition.
7059 * struct S { ... }; (is_declaration = true)
7060 * struct T { ... } t = { ... }; (is_declaration = true)
7061 * S s = { ... }; (is_declaration = false)
7063 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
7064 return this->structure
->hir(instructions
, state
);
7071 * Process a structure or interface block tree into an array of structure fields
7073 * After parsing, where there are some syntax differnces, structures and
7074 * interface blocks are almost identical. They are similar enough that the
7075 * AST for each can be processed the same way into a set of
7076 * \c glsl_struct_field to describe the members.
7078 * If we're processing an interface block, var_mode should be the type of the
7079 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
7080 * ir_var_shader_storage). If we're processing a structure, var_mode should be
7084 * The number of fields processed. A pointer to the array structure fields is
7085 * stored in \c *fields_ret.
7088 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
7089 struct _mesa_glsl_parse_state
*state
,
7090 exec_list
*declarations
,
7091 glsl_struct_field
**fields_ret
,
7093 enum glsl_matrix_layout matrix_layout
,
7094 bool allow_reserved_names
,
7095 ir_variable_mode var_mode
,
7096 ast_type_qualifier
*layout
,
7097 unsigned block_stream
,
7098 unsigned block_xfb_buffer
,
7099 unsigned block_xfb_offset
,
7100 unsigned expl_location
,
7101 unsigned expl_align
)
7103 unsigned decl_count
= 0;
7104 unsigned next_offset
= 0;
7106 /* Make an initial pass over the list of fields to determine how
7107 * many there are. Each element in this list is an ast_declarator_list.
7108 * This means that we actually need to count the number of elements in the
7109 * 'declarations' list in each of the elements.
7111 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7112 decl_count
+= decl_list
->declarations
.length();
7115 /* Allocate storage for the fields and process the field
7116 * declarations. As the declarations are processed, try to also convert
7117 * the types to HIR. This ensures that structure definitions embedded in
7118 * other structure definitions or in interface blocks are processed.
7120 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
7123 bool first_member
= true;
7124 bool first_member_has_explicit_location
= false;
7127 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
7128 const char *type_name
;
7129 YYLTYPE loc
= decl_list
->get_location();
7131 decl_list
->type
->specifier
->hir(instructions
, state
);
7133 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
7135 * "Anonymous structures are not supported; so embedded structures
7136 * must have a declarator. A name given to an embedded struct is
7137 * scoped at the same level as the struct it is embedded in."
7139 * The same section of the GLSL 1.20 spec says:
7141 * "Anonymous structures are not supported. Embedded structures are
7144 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
7145 * embedded structures in 1.10 only.
7147 if (state
->language_version
!= 110 &&
7148 decl_list
->type
->specifier
->structure
!= NULL
)
7149 _mesa_glsl_error(&loc
, state
,
7150 "embedded structure declarations are not allowed");
7152 const glsl_type
*decl_type
=
7153 decl_list
->type
->glsl_type(& type_name
, state
);
7155 const struct ast_type_qualifier
*const qual
=
7156 &decl_list
->type
->qualifier
;
7158 /* From section 4.3.9 of the GLSL 4.40 spec:
7160 * "[In interface blocks] opaque types are not allowed."
7162 * It should be impossible for decl_type to be NULL here. Cases that
7163 * might naturally lead to decl_type being NULL, especially for the
7164 * is_interface case, will have resulted in compilation having
7165 * already halted due to a syntax error.
7170 /* From section 4.3.7 of the ARB_bindless_texture spec:
7172 * "(remove the following bullet from the last list on p. 39,
7173 * thereby permitting sampler types in interface blocks; image
7174 * types are also permitted in blocks by this extension)"
7176 * * sampler types are not allowed
7178 if (decl_type
->contains_atomic() ||
7179 (!state
->has_bindless() && decl_type
->contains_opaque())) {
7180 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
7181 "interface block contains %s variable",
7182 state
->has_bindless() ? "atomic" : "opaque");
7185 if (decl_type
->contains_atomic()) {
7186 /* From section 4.1.7.3 of the GLSL 4.40 spec:
7188 * "Members of structures cannot be declared as atomic counter
7191 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
7194 if (!state
->has_bindless() && decl_type
->contains_image()) {
7195 /* FINISHME: Same problem as with atomic counters.
7196 * FINISHME: Request clarification from Khronos and add
7197 * FINISHME: spec quotation here.
7199 _mesa_glsl_error(&loc
, state
, "image in structure");
7203 if (qual
->flags
.q
.explicit_binding
) {
7204 _mesa_glsl_error(&loc
, state
,
7205 "binding layout qualifier cannot be applied "
7206 "to struct or interface block members");
7210 if (!first_member
) {
7211 if (!layout
->flags
.q
.explicit_location
&&
7212 ((first_member_has_explicit_location
&&
7213 !qual
->flags
.q
.explicit_location
) ||
7214 (!first_member_has_explicit_location
&&
7215 qual
->flags
.q
.explicit_location
))) {
7216 _mesa_glsl_error(&loc
, state
,
7217 "when block-level location layout qualifier "
7218 "is not supplied either all members must "
7219 "have a location layout qualifier or all "
7220 "members must not have a location layout "
7224 first_member
= false;
7225 first_member_has_explicit_location
=
7226 qual
->flags
.q
.explicit_location
;
7230 if (qual
->flags
.q
.std140
||
7231 qual
->flags
.q
.std430
||
7232 qual
->flags
.q
.packed
||
7233 qual
->flags
.q
.shared
) {
7234 _mesa_glsl_error(&loc
, state
,
7235 "uniform/shader storage block layout qualifiers "
7236 "std140, std430, packed, and shared can only be "
7237 "applied to uniform/shader storage blocks, not "
7241 if (qual
->flags
.q
.constant
) {
7242 _mesa_glsl_error(&loc
, state
,
7243 "const storage qualifier cannot be applied "
7244 "to struct or interface block members");
7247 validate_memory_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7248 validate_image_format_qualifier_for_type(state
, &loc
, qual
, decl_type
);
7250 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
7252 * "A block member may be declared with a stream identifier, but
7253 * the specified stream must match the stream associated with the
7254 * containing block."
7256 if (qual
->flags
.q
.explicit_stream
) {
7257 unsigned qual_stream
;
7258 if (process_qualifier_constant(state
, &loc
, "stream",
7259 qual
->stream
, &qual_stream
) &&
7260 qual_stream
!= block_stream
) {
7261 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
7262 "interface block member does not match "
7263 "the interface block (%u vs %u)", qual_stream
,
7269 unsigned explicit_xfb_buffer
= 0;
7270 if (qual
->flags
.q
.explicit_xfb_buffer
) {
7271 unsigned qual_xfb_buffer
;
7272 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
7273 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
7274 explicit_xfb_buffer
= 1;
7275 if (qual_xfb_buffer
!= block_xfb_buffer
)
7276 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
7277 "interface block member does not match "
7278 "the interface block (%u vs %u)",
7279 qual_xfb_buffer
, block_xfb_buffer
);
7281 xfb_buffer
= (int) qual_xfb_buffer
;
7284 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
7285 xfb_buffer
= (int) block_xfb_buffer
;
7288 int xfb_stride
= -1;
7289 if (qual
->flags
.q
.explicit_xfb_stride
) {
7290 unsigned qual_xfb_stride
;
7291 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
7292 qual
->xfb_stride
, &qual_xfb_stride
)) {
7293 xfb_stride
= (int) qual_xfb_stride
;
7297 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
7298 _mesa_glsl_error(&loc
, state
,
7299 "interpolation qualifiers cannot be used "
7300 "with uniform interface blocks");
7303 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
7304 qual
->has_auxiliary_storage()) {
7305 _mesa_glsl_error(&loc
, state
,
7306 "auxiliary storage qualifiers cannot be used "
7307 "in uniform blocks or structures.");
7310 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
7311 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
7312 _mesa_glsl_error(&loc
, state
,
7313 "row_major and column_major can only be "
7314 "applied to interface blocks");
7316 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
7319 foreach_list_typed (ast_declaration
, decl
, link
,
7320 &decl_list
->declarations
) {
7321 YYLTYPE loc
= decl
->get_location();
7323 if (!allow_reserved_names
)
7324 validate_identifier(decl
->identifier
, loc
, state
);
7326 const struct glsl_type
*field_type
=
7327 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
7328 validate_array_dimensions(field_type
, state
, &loc
);
7329 fields
[i
].type
= field_type
;
7330 fields
[i
].name
= decl
->identifier
;
7331 fields
[i
].interpolation
=
7332 interpret_interpolation_qualifier(qual
, field_type
,
7333 var_mode
, state
, &loc
);
7334 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
7335 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
7336 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
7337 fields
[i
].precision
= qual
->precision
;
7338 fields
[i
].offset
= -1;
7339 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
7340 fields
[i
].xfb_buffer
= xfb_buffer
;
7341 fields
[i
].xfb_stride
= xfb_stride
;
7343 if (qual
->flags
.q
.explicit_location
) {
7344 unsigned qual_location
;
7345 if (process_qualifier_constant(state
, &loc
, "location",
7346 qual
->location
, &qual_location
)) {
7347 fields
[i
].location
= qual_location
+
7348 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
7349 expl_location
= fields
[i
].location
+
7350 fields
[i
].type
->count_attribute_slots(false);
7353 if (layout
&& layout
->flags
.q
.explicit_location
) {
7354 fields
[i
].location
= expl_location
;
7355 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
7357 fields
[i
].location
= -1;
7361 /* Offset can only be used with std430 and std140 layouts an initial
7362 * value of 0 is used for error detection.
7368 if (qual
->flags
.q
.row_major
||
7369 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
7375 if(layout
->flags
.q
.std140
) {
7376 align
= field_type
->std140_base_alignment(row_major
);
7377 size
= field_type
->std140_size(row_major
);
7378 } else if (layout
->flags
.q
.std430
) {
7379 align
= field_type
->std430_base_alignment(row_major
);
7380 size
= field_type
->std430_size(row_major
);
7384 if (qual
->flags
.q
.explicit_offset
) {
7385 unsigned qual_offset
;
7386 if (process_qualifier_constant(state
, &loc
, "offset",
7387 qual
->offset
, &qual_offset
)) {
7388 if (align
!= 0 && size
!= 0) {
7389 if (next_offset
> qual_offset
)
7390 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7391 "offset overlaps previous member");
7393 if (qual_offset
% align
) {
7394 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7395 "must be a multiple of the base "
7396 "alignment of %s", field_type
->name
);
7398 fields
[i
].offset
= qual_offset
;
7399 next_offset
= glsl_align(qual_offset
+ size
, align
);
7401 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7402 "with std430 and std140 layouts");
7407 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7408 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7410 if (align
== 0 || size
== 0) {
7411 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7412 "std430 and std140 layouts");
7413 } else if (qual
->flags
.q
.explicit_align
) {
7414 unsigned member_align
;
7415 if (process_qualifier_constant(state
, &loc
, "align",
7416 qual
->align
, &member_align
)) {
7417 if (member_align
== 0 ||
7418 member_align
& (member_align
- 1)) {
7419 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7420 "in not a power of 2");
7422 fields
[i
].offset
= glsl_align(offset
, member_align
);
7423 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7427 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7428 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7430 } else if (!qual
->flags
.q
.explicit_offset
) {
7431 if (align
!= 0 && size
!= 0)
7432 next_offset
= glsl_align(next_offset
+ size
, align
);
7435 /* From the ARB_enhanced_layouts spec:
7437 * "The given offset applies to the first component of the first
7438 * member of the qualified entity. Then, within the qualified
7439 * entity, subsequent components are each assigned, in order, to
7440 * the next available offset aligned to a multiple of that
7441 * component's size. Aggregate types are flattened down to the
7442 * component level to get this sequence of components."
7444 if (qual
->flags
.q
.explicit_xfb_offset
) {
7445 unsigned xfb_offset
;
7446 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7447 qual
->offset
, &xfb_offset
)) {
7448 fields
[i
].offset
= xfb_offset
;
7449 block_xfb_offset
= fields
[i
].offset
+
7450 4 * field_type
->component_slots();
7453 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7454 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7455 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7456 block_xfb_offset
+= 4 * field_type
->component_slots();
7460 /* Propogate row- / column-major information down the fields of the
7461 * structure or interface block. Structures need this data because
7462 * the structure may contain a structure that contains ... a matrix
7463 * that need the proper layout.
7465 if (is_interface
&& layout
&&
7466 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7467 (field_type
->without_array()->is_matrix()
7468 || field_type
->without_array()->is_record())) {
7469 /* If no layout is specified for the field, inherit the layout
7472 fields
[i
].matrix_layout
= matrix_layout
;
7474 if (qual
->flags
.q
.row_major
)
7475 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7476 else if (qual
->flags
.q
.column_major
)
7477 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7479 /* If we're processing an uniform or buffer block, the matrix
7480 * layout must be decided by this point.
7482 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7483 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7486 /* Memory qualifiers are allowed on buffer and image variables, while
7487 * the format qualifier is only accepted for images.
7489 if (var_mode
== ir_var_shader_storage
||
7490 field_type
->without_array()->is_image()) {
7491 /* For readonly and writeonly qualifiers the field definition,
7492 * if set, overwrites the layout qualifier.
7494 if (qual
->flags
.q
.read_only
|| qual
->flags
.q
.write_only
) {
7495 fields
[i
].memory_read_only
= qual
->flags
.q
.read_only
;
7496 fields
[i
].memory_write_only
= qual
->flags
.q
.write_only
;
7498 fields
[i
].memory_read_only
=
7499 layout
? layout
->flags
.q
.read_only
: 0;
7500 fields
[i
].memory_write_only
=
7501 layout
? layout
->flags
.q
.write_only
: 0;
7504 /* For other qualifiers, we set the flag if either the layout
7505 * qualifier or the field qualifier are set
7507 fields
[i
].memory_coherent
= qual
->flags
.q
.coherent
||
7508 (layout
&& layout
->flags
.q
.coherent
);
7509 fields
[i
].memory_volatile
= qual
->flags
.q
._volatile
||
7510 (layout
&& layout
->flags
.q
._volatile
);
7511 fields
[i
].memory_restrict
= qual
->flags
.q
.restrict_flag
||
7512 (layout
&& layout
->flags
.q
.restrict_flag
);
7514 if (field_type
->without_array()->is_image()) {
7515 if (qual
->flags
.q
.explicit_image_format
) {
7516 if (qual
->image_base_type
!=
7517 field_type
->without_array()->sampled_type
) {
7518 _mesa_glsl_error(&loc
, state
, "format qualifier doesn't "
7519 "match the base data type of the image");
7522 fields
[i
].image_format
= qual
->image_format
;
7524 if (!qual
->flags
.q
.write_only
) {
7525 _mesa_glsl_error(&loc
, state
, "image not qualified with "
7526 "`writeonly' must have a format layout "
7530 fields
[i
].image_format
= GL_NONE
;
7539 assert(i
== decl_count
);
7541 *fields_ret
= fields
;
7547 ast_struct_specifier::hir(exec_list
*instructions
,
7548 struct _mesa_glsl_parse_state
*state
)
7550 YYLTYPE loc
= this->get_location();
7552 unsigned expl_location
= 0;
7553 if (layout
&& layout
->flags
.q
.explicit_location
) {
7554 if (!process_qualifier_constant(state
, &loc
, "location",
7555 layout
->location
, &expl_location
)) {
7558 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7562 glsl_struct_field
*fields
;
7563 unsigned decl_count
=
7564 ast_process_struct_or_iface_block_members(instructions
,
7566 &this->declarations
,
7569 GLSL_MATRIX_LAYOUT_INHERITED
,
7570 false /* allow_reserved_names */,
7573 0, /* for interface only */
7574 0, /* for interface only */
7575 0, /* for interface only */
7577 0 /* for interface only */);
7579 validate_identifier(this->name
, loc
, state
);
7581 type
= glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7583 if (!type
->is_anonymous() && !state
->symbols
->add_type(name
, type
)) {
7584 const glsl_type
*match
= state
->symbols
->get_type(name
);
7585 /* allow struct matching for desktop GL - older UE4 does this */
7586 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(type
, false))
7587 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7589 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7591 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7593 state
->num_user_structures
+ 1);
7595 s
[state
->num_user_structures
] = type
;
7596 state
->user_structures
= s
;
7597 state
->num_user_structures
++;
7601 /* Structure type definitions do not have r-values.
7608 * Visitor class which detects whether a given interface block has been used.
7610 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7613 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7614 : mode(mode
), block(block
), found(false)
7618 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7620 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7624 return visit_continue
;
7627 bool usage_found() const
7633 ir_variable_mode mode
;
7634 const glsl_type
*block
;
7639 is_unsized_array_last_element(ir_variable
*v
)
7641 const glsl_type
*interface_type
= v
->get_interface_type();
7642 int length
= interface_type
->length
;
7644 assert(v
->type
->is_unsized_array());
7646 /* Check if it is the last element of the interface */
7647 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7653 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7655 var
->data
.memory_read_only
= field
.memory_read_only
;
7656 var
->data
.memory_write_only
= field
.memory_write_only
;
7657 var
->data
.memory_coherent
= field
.memory_coherent
;
7658 var
->data
.memory_volatile
= field
.memory_volatile
;
7659 var
->data
.memory_restrict
= field
.memory_restrict
;
7663 ast_interface_block::hir(exec_list
*instructions
,
7664 struct _mesa_glsl_parse_state
*state
)
7666 YYLTYPE loc
= this->get_location();
7668 /* Interface blocks must be declared at global scope */
7669 if (state
->current_function
!= NULL
) {
7670 _mesa_glsl_error(&loc
, state
,
7671 "Interface block `%s' must be declared "
7676 /* Validate qualifiers:
7678 * - Layout Qualifiers as per the table in Section 4.4
7679 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7681 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7684 * "Additionally, memory qualifiers may also be used in the declaration
7685 * of shader storage blocks"
7687 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7688 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7689 * Layout Qualifiers) of the GLSL 4.50 spec says:
7691 * "The std430 qualifier is supported only for shader storage blocks;
7692 * using std430 on a uniform block will result in a compile-time error."
7694 ast_type_qualifier allowed_blk_qualifiers
;
7695 allowed_blk_qualifiers
.flags
.i
= 0;
7696 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7697 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7698 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7699 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7700 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7701 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7702 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7703 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7704 if (this->layout
.flags
.q
.buffer
) {
7705 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7706 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7707 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7708 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7709 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7710 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7711 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7713 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7716 /* Interface block */
7717 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7719 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7720 if (this->layout
.flags
.q
.out
) {
7721 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7722 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7723 state
->stage
== MESA_SHADER_TESS_CTRL
||
7724 state
->stage
== MESA_SHADER_TESS_EVAL
||
7725 state
->stage
== MESA_SHADER_VERTEX
) {
7726 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7727 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7728 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7729 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7730 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7731 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7732 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7733 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7735 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7736 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7740 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7741 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7742 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7747 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7748 "invalid qualifier for block",
7751 enum glsl_interface_packing packing
;
7752 if (this->layout
.flags
.q
.std140
) {
7753 packing
= GLSL_INTERFACE_PACKING_STD140
;
7754 } else if (this->layout
.flags
.q
.packed
) {
7755 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7756 } else if (this->layout
.flags
.q
.std430
) {
7757 packing
= GLSL_INTERFACE_PACKING_STD430
;
7759 /* The default layout is shared.
7761 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7764 ir_variable_mode var_mode
;
7765 const char *iface_type_name
;
7766 if (this->layout
.flags
.q
.in
) {
7767 var_mode
= ir_var_shader_in
;
7768 iface_type_name
= "in";
7769 } else if (this->layout
.flags
.q
.out
) {
7770 var_mode
= ir_var_shader_out
;
7771 iface_type_name
= "out";
7772 } else if (this->layout
.flags
.q
.uniform
) {
7773 var_mode
= ir_var_uniform
;
7774 iface_type_name
= "uniform";
7775 } else if (this->layout
.flags
.q
.buffer
) {
7776 var_mode
= ir_var_shader_storage
;
7777 iface_type_name
= "buffer";
7779 var_mode
= ir_var_auto
;
7780 iface_type_name
= "UNKNOWN";
7781 assert(!"interface block layout qualifier not found!");
7784 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7785 if (this->layout
.flags
.q
.row_major
)
7786 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7787 else if (this->layout
.flags
.q
.column_major
)
7788 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7790 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7791 exec_list declared_variables
;
7792 glsl_struct_field
*fields
;
7794 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7795 * that we don't have incompatible qualifiers
7797 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7798 _mesa_glsl_error(&loc
, state
,
7799 "Interface block sets both readonly and writeonly");
7802 unsigned qual_stream
;
7803 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7805 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7806 /* If the stream qualifier is invalid it doesn't make sense to continue
7807 * on and try to compare stream layouts on member variables against it
7808 * so just return early.
7813 unsigned qual_xfb_buffer
;
7814 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7815 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7816 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7820 unsigned qual_xfb_offset
;
7821 if (layout
.flags
.q
.explicit_xfb_offset
) {
7822 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7823 layout
.offset
, &qual_xfb_offset
)) {
7828 unsigned qual_xfb_stride
;
7829 if (layout
.flags
.q
.explicit_xfb_stride
) {
7830 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7831 layout
.xfb_stride
, &qual_xfb_stride
)) {
7836 unsigned expl_location
= 0;
7837 if (layout
.flags
.q
.explicit_location
) {
7838 if (!process_qualifier_constant(state
, &loc
, "location",
7839 layout
.location
, &expl_location
)) {
7842 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7843 : VARYING_SLOT_VAR0
;
7847 unsigned expl_align
= 0;
7848 if (layout
.flags
.q
.explicit_align
) {
7849 if (!process_qualifier_constant(state
, &loc
, "align",
7850 layout
.align
, &expl_align
)) {
7853 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7854 _mesa_glsl_error(&loc
, state
, "align layout qualifier is not a "
7861 unsigned int num_variables
=
7862 ast_process_struct_or_iface_block_members(&declared_variables
,
7864 &this->declarations
,
7868 redeclaring_per_vertex
,
7877 if (!redeclaring_per_vertex
) {
7878 validate_identifier(this->block_name
, loc
, state
);
7880 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7882 * "Block names have no other use within a shader beyond interface
7883 * matching; it is a compile-time error to use a block name at global
7884 * scope for anything other than as a block name."
7886 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7887 if (var
&& !var
->type
->is_interface()) {
7888 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7889 "already used in the scope.",
7894 const glsl_type
*earlier_per_vertex
= NULL
;
7895 if (redeclaring_per_vertex
) {
7896 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7897 * the named interface block gl_in, we can find it by looking at the
7898 * previous declaration of gl_in. Otherwise we can find it by looking
7899 * at the previous decalartion of any of the built-in outputs,
7902 * Also check that the instance name and array-ness of the redeclaration
7906 case ir_var_shader_in
:
7907 if (ir_variable
*earlier_gl_in
=
7908 state
->symbols
->get_variable("gl_in")) {
7909 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7911 _mesa_glsl_error(&loc
, state
,
7912 "redeclaration of gl_PerVertex input not allowed "
7914 _mesa_shader_stage_to_string(state
->stage
));
7916 if (this->instance_name
== NULL
||
7917 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7918 !this->array_specifier
->is_single_dimension()) {
7919 _mesa_glsl_error(&loc
, state
,
7920 "gl_PerVertex input must be redeclared as "
7924 case ir_var_shader_out
:
7925 if (ir_variable
*earlier_gl_Position
=
7926 state
->symbols
->get_variable("gl_Position")) {
7927 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7928 } else if (ir_variable
*earlier_gl_out
=
7929 state
->symbols
->get_variable("gl_out")) {
7930 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7932 _mesa_glsl_error(&loc
, state
,
7933 "redeclaration of gl_PerVertex output not "
7934 "allowed in the %s shader",
7935 _mesa_shader_stage_to_string(state
->stage
));
7937 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7938 if (this->instance_name
== NULL
||
7939 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7940 _mesa_glsl_error(&loc
, state
,
7941 "gl_PerVertex output must be redeclared as "
7945 if (this->instance_name
!= NULL
) {
7946 _mesa_glsl_error(&loc
, state
,
7947 "gl_PerVertex output may not be redeclared with "
7948 "an instance name");
7953 _mesa_glsl_error(&loc
, state
,
7954 "gl_PerVertex must be declared as an input or an "
7959 if (earlier_per_vertex
== NULL
) {
7960 /* An error has already been reported. Bail out to avoid null
7961 * dereferences later in this function.
7966 /* Copy locations from the old gl_PerVertex interface block. */
7967 for (unsigned i
= 0; i
< num_variables
; i
++) {
7968 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7970 _mesa_glsl_error(&loc
, state
,
7971 "redeclaration of gl_PerVertex must be a subset "
7972 "of the built-in members of gl_PerVertex");
7974 fields
[i
].location
=
7975 earlier_per_vertex
->fields
.structure
[j
].location
;
7977 earlier_per_vertex
->fields
.structure
[j
].offset
;
7978 fields
[i
].interpolation
=
7979 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7980 fields
[i
].centroid
=
7981 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7983 earlier_per_vertex
->fields
.structure
[j
].sample
;
7985 earlier_per_vertex
->fields
.structure
[j
].patch
;
7986 fields
[i
].precision
=
7987 earlier_per_vertex
->fields
.structure
[j
].precision
;
7988 fields
[i
].explicit_xfb_buffer
=
7989 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7990 fields
[i
].xfb_buffer
=
7991 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7992 fields
[i
].xfb_stride
=
7993 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7997 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
8000 * If a built-in interface block is redeclared, it must appear in
8001 * the shader before any use of any member included in the built-in
8002 * declaration, or a compilation error will result.
8004 * This appears to be a clarification to the behaviour established for
8005 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
8006 * regardless of GLSL version.
8008 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
8009 v
.run(instructions
);
8010 if (v
.usage_found()) {
8011 _mesa_glsl_error(&loc
, state
,
8012 "redeclaration of a built-in interface block must "
8013 "appear before any use of any member of the "
8018 const glsl_type
*block_type
=
8019 glsl_type::get_interface_instance(fields
,
8023 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
8026 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
8028 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
8029 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
8032 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
8033 YYLTYPE loc
= this->get_location();
8034 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
8035 "already taken in the current scope",
8036 this->block_name
, iface_type_name
);
8039 /* Since interface blocks cannot contain statements, it should be
8040 * impossible for the block to generate any instructions.
8042 assert(declared_variables
.is_empty());
8044 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
8046 * Geometry shader input variables get the per-vertex values written
8047 * out by vertex shader output variables of the same names. Since a
8048 * geometry shader operates on a set of vertices, each input varying
8049 * variable (or input block, see interface blocks below) needs to be
8050 * declared as an array.
8052 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
8053 var_mode
== ir_var_shader_in
) {
8054 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
8055 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8056 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
8057 !this->layout
.flags
.q
.patch
&&
8058 this->array_specifier
== NULL
&&
8059 var_mode
== ir_var_shader_in
) {
8060 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
8061 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
8062 !this->layout
.flags
.q
.patch
&&
8063 this->array_specifier
== NULL
&&
8064 var_mode
== ir_var_shader_out
) {
8065 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
8069 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
8072 * "If an instance name (instance-name) is used, then it puts all the
8073 * members inside a scope within its own name space, accessed with the
8074 * field selector ( . ) operator (analogously to structures)."
8076 if (this->instance_name
) {
8077 if (redeclaring_per_vertex
) {
8078 /* When a built-in in an unnamed interface block is redeclared,
8079 * get_variable_being_redeclared() calls
8080 * check_builtin_array_max_size() to make sure that built-in array
8081 * variables aren't redeclared to illegal sizes. But we're looking
8082 * at a redeclaration of a named built-in interface block. So we
8083 * have to manually call check_builtin_array_max_size() for all parts
8084 * of the interface that are arrays.
8086 for (unsigned i
= 0; i
< num_variables
; i
++) {
8087 if (fields
[i
].type
->is_array()) {
8088 const unsigned size
= fields
[i
].type
->array_size();
8089 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
8093 validate_identifier(this->instance_name
, loc
, state
);
8098 if (this->array_specifier
!= NULL
) {
8099 const glsl_type
*block_array_type
=
8100 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
8102 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
8104 * For uniform blocks declared an array, each individual array
8105 * element corresponds to a separate buffer object backing one
8106 * instance of the block. As the array size indicates the number
8107 * of buffer objects needed, uniform block array declarations
8108 * must specify an array size.
8110 * And a few paragraphs later:
8112 * Geometry shader input blocks must be declared as arrays and
8113 * follow the array declaration and linking rules for all
8114 * geometry shader inputs. All other input and output block
8115 * arrays must specify an array size.
8117 * The same applies to tessellation shaders.
8119 * The upshot of this is that the only circumstance where an
8120 * interface array size *doesn't* need to be specified is on a
8121 * geometry shader input, tessellation control shader input,
8122 * tessellation control shader output, and tessellation evaluation
8125 if (block_array_type
->is_unsized_array()) {
8126 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
8127 state
->stage
== MESA_SHADER_TESS_CTRL
||
8128 state
->stage
== MESA_SHADER_TESS_EVAL
;
8129 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
8131 if (this->layout
.flags
.q
.in
) {
8133 _mesa_glsl_error(&loc
, state
,
8134 "unsized input block arrays not allowed in "
8136 _mesa_shader_stage_to_string(state
->stage
));
8137 } else if (this->layout
.flags
.q
.out
) {
8139 _mesa_glsl_error(&loc
, state
,
8140 "unsized output block arrays not allowed in "
8142 _mesa_shader_stage_to_string(state
->stage
));
8144 /* by elimination, this is a uniform block array */
8145 _mesa_glsl_error(&loc
, state
,
8146 "unsized uniform block arrays not allowed in "
8148 _mesa_shader_stage_to_string(state
->stage
));
8152 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
8154 * * Arrays of arrays of blocks are not allowed
8156 if (state
->es_shader
&& block_array_type
->is_array() &&
8157 block_array_type
->fields
.array
->is_array()) {
8158 _mesa_glsl_error(&loc
, state
,
8159 "arrays of arrays interface blocks are "
8163 var
= new(state
) ir_variable(block_array_type
,
8164 this->instance_name
,
8167 var
= new(state
) ir_variable(block_type
,
8168 this->instance_name
,
8172 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8173 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8175 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8176 var
->data
.read_only
= true;
8178 var
->data
.patch
= this->layout
.flags
.q
.patch
;
8180 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
8181 handle_geometry_shader_input_decl(state
, loc
, var
);
8182 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
8183 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
8184 handle_tess_shader_input_decl(state
, loc
, var
);
8185 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
8186 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
8188 for (unsigned i
= 0; i
< num_variables
; i
++) {
8189 if (var
->data
.mode
== ir_var_shader_storage
)
8190 apply_memory_qualifiers(var
, fields
[i
]);
8193 if (ir_variable
*earlier
=
8194 state
->symbols
->get_variable(this->instance_name
)) {
8195 if (!redeclaring_per_vertex
) {
8196 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
8197 this->instance_name
);
8199 earlier
->data
.how_declared
= ir_var_declared_normally
;
8200 earlier
->type
= var
->type
;
8201 earlier
->reinit_interface_type(block_type
);
8204 if (this->layout
.flags
.q
.explicit_binding
) {
8205 apply_explicit_binding(state
, &loc
, var
, var
->type
,
8209 var
->data
.stream
= qual_stream
;
8210 if (layout
.flags
.q
.explicit_location
) {
8211 var
->data
.location
= expl_location
;
8212 var
->data
.explicit_location
= true;
8215 state
->symbols
->add_variable(var
);
8216 instructions
->push_tail(var
);
8219 /* In order to have an array size, the block must also be declared with
8222 assert(this->array_specifier
== NULL
);
8224 for (unsigned i
= 0; i
< num_variables
; i
++) {
8226 new(state
) ir_variable(fields
[i
].type
,
8227 ralloc_strdup(state
, fields
[i
].name
),
8229 var
->data
.interpolation
= fields
[i
].interpolation
;
8230 var
->data
.centroid
= fields
[i
].centroid
;
8231 var
->data
.sample
= fields
[i
].sample
;
8232 var
->data
.patch
= fields
[i
].patch
;
8233 var
->data
.stream
= qual_stream
;
8234 var
->data
.location
= fields
[i
].location
;
8236 if (fields
[i
].location
!= -1)
8237 var
->data
.explicit_location
= true;
8239 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
8240 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
8242 if (fields
[i
].offset
!= -1)
8243 var
->data
.explicit_xfb_offset
= true;
8244 var
->data
.offset
= fields
[i
].offset
;
8246 var
->init_interface_type(block_type
);
8248 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
8249 var
->data
.read_only
= true;
8251 /* Precision qualifiers do not have any meaning in Desktop GLSL */
8252 if (state
->es_shader
) {
8253 var
->data
.precision
=
8254 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
8258 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
8259 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
8260 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
8262 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
8265 if (var
->data
.mode
== ir_var_shader_storage
)
8266 apply_memory_qualifiers(var
, fields
[i
]);
8268 /* Examine var name here since var may get deleted in the next call */
8269 bool var_is_gl_id
= is_gl_identifier(var
->name
);
8271 if (redeclaring_per_vertex
) {
8272 bool is_redeclaration
;
8274 get_variable_being_redeclared(&var
, loc
, state
,
8275 true /* allow_all_redeclarations */,
8277 if (!var_is_gl_id
|| !is_redeclaration
) {
8278 _mesa_glsl_error(&loc
, state
,
8279 "redeclaration of gl_PerVertex can only "
8280 "include built-in variables");
8281 } else if (var
->data
.how_declared
== ir_var_declared_normally
) {
8282 _mesa_glsl_error(&loc
, state
,
8283 "`%s' has already been redeclared",
8286 var
->data
.how_declared
= ir_var_declared_in_block
;
8287 var
->reinit_interface_type(block_type
);
8292 if (state
->symbols
->get_variable(var
->name
) != NULL
)
8293 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
8295 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
8296 * The UBO declaration itself doesn't get an ir_variable unless it
8297 * has an instance name. This is ugly.
8299 if (this->layout
.flags
.q
.explicit_binding
) {
8300 apply_explicit_binding(state
, &loc
, var
,
8301 var
->get_interface_type(), &this->layout
);
8304 if (var
->type
->is_unsized_array()) {
8305 if (var
->is_in_shader_storage_block() &&
8306 is_unsized_array_last_element(var
)) {
8307 var
->data
.from_ssbo_unsized_array
= true;
8309 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
8311 * "If an array is declared as the last member of a shader storage
8312 * block and the size is not specified at compile-time, it is
8313 * sized at run-time. In all other cases, arrays are sized only
8316 * In desktop GLSL it is allowed to have unsized-arrays that are
8317 * not last, as long as we can determine that they are implicitly
8320 if (state
->es_shader
) {
8321 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
8322 "definition: only last member of a shader "
8323 "storage block can be defined as unsized "
8324 "array", fields
[i
].name
);
8329 state
->symbols
->add_variable(var
);
8330 instructions
->push_tail(var
);
8333 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
8334 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
8336 * It is also a compilation error ... to redeclare a built-in
8337 * block and then use a member from that built-in block that was
8338 * not included in the redeclaration.
8340 * This appears to be a clarification to the behaviour established
8341 * for gl_PerVertex by GLSL 1.50, therefore we implement this
8342 * behaviour regardless of GLSL version.
8344 * To prevent the shader from using a member that was not included in
8345 * the redeclaration, we disable any ir_variables that are still
8346 * associated with the old declaration of gl_PerVertex (since we've
8347 * already updated all of the variables contained in the new
8348 * gl_PerVertex to point to it).
8350 * As a side effect this will prevent
8351 * validate_intrastage_interface_blocks() from getting confused and
8352 * thinking there are conflicting definitions of gl_PerVertex in the
8355 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8356 ir_variable
*const var
= node
->as_variable();
8358 var
->get_interface_type() == earlier_per_vertex
&&
8359 var
->data
.mode
== var_mode
) {
8360 if (var
->data
.how_declared
== ir_var_declared_normally
) {
8361 _mesa_glsl_error(&loc
, state
,
8362 "redeclaration of gl_PerVertex cannot "
8363 "follow a redeclaration of `%s'",
8366 state
->symbols
->disable_variable(var
->name
);
8378 ast_tcs_output_layout::hir(exec_list
*instructions
,
8379 struct _mesa_glsl_parse_state
*state
)
8381 YYLTYPE loc
= this->get_location();
8383 unsigned num_vertices
;
8384 if (!state
->out_qualifier
->vertices
->
8385 process_qualifier_constant(state
, "vertices", &num_vertices
,
8387 /* return here to stop cascading incorrect error messages */
8391 /* If any shader outputs occurred before this declaration and specified an
8392 * array size, make sure the size they specified is consistent with the
8395 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8396 _mesa_glsl_error(&loc
, state
,
8397 "this tessellation control shader output layout "
8398 "specifies %u vertices, but a previous output "
8399 "is declared with size %u",
8400 num_vertices
, state
->tcs_output_size
);
8404 state
->tcs_output_vertices_specified
= true;
8406 /* If any shader outputs occurred before this declaration and did not
8407 * specify an array size, their size is determined now.
8409 foreach_in_list (ir_instruction
, node
, instructions
) {
8410 ir_variable
*var
= node
->as_variable();
8411 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8414 /* Note: Not all tessellation control shader output are arrays. */
8415 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8418 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8419 _mesa_glsl_error(&loc
, state
,
8420 "this tessellation control shader output layout "
8421 "specifies %u vertices, but an access to element "
8422 "%u of output `%s' already exists", num_vertices
,
8423 var
->data
.max_array_access
, var
->name
);
8425 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8435 ast_gs_input_layout::hir(exec_list
*instructions
,
8436 struct _mesa_glsl_parse_state
*state
)
8438 YYLTYPE loc
= this->get_location();
8440 /* Should have been prevented by the parser. */
8441 assert(!state
->gs_input_prim_type_specified
8442 || state
->in_qualifier
->prim_type
== this->prim_type
);
8444 /* If any shader inputs occurred before this declaration and specified an
8445 * array size, make sure the size they specified is consistent with the
8448 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8449 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8450 _mesa_glsl_error(&loc
, state
,
8451 "this geometry shader input layout implies %u vertices"
8452 " per primitive, but a previous input is declared"
8453 " with size %u", num_vertices
, state
->gs_input_size
);
8457 state
->gs_input_prim_type_specified
= true;
8459 /* If any shader inputs occurred before this declaration and did not
8460 * specify an array size, their size is determined now.
8462 foreach_in_list(ir_instruction
, node
, instructions
) {
8463 ir_variable
*var
= node
->as_variable();
8464 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8467 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8471 if (var
->type
->is_unsized_array()) {
8472 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8473 _mesa_glsl_error(&loc
, state
,
8474 "this geometry shader input layout implies %u"
8475 " vertices, but an access to element %u of input"
8476 " `%s' already exists", num_vertices
,
8477 var
->data
.max_array_access
, var
->name
);
8479 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8490 ast_cs_input_layout::hir(exec_list
*instructions
,
8491 struct _mesa_glsl_parse_state
*state
)
8493 YYLTYPE loc
= this->get_location();
8495 /* From the ARB_compute_shader specification:
8497 * If the local size of the shader in any dimension is greater
8498 * than the maximum size supported by the implementation for that
8499 * dimension, a compile-time error results.
8501 * It is not clear from the spec how the error should be reported if
8502 * the total size of the work group exceeds
8503 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8504 * report it at compile time as well.
8506 GLuint64 total_invocations
= 1;
8507 unsigned qual_local_size
[3];
8508 for (int i
= 0; i
< 3; i
++) {
8510 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8512 /* Infer a local_size of 1 for unspecified dimensions */
8513 if (this->local_size
[i
] == NULL
) {
8514 qual_local_size
[i
] = 1;
8515 } else if (!this->local_size
[i
]->
8516 process_qualifier_constant(state
, local_size_str
,
8517 &qual_local_size
[i
], false)) {
8518 ralloc_free(local_size_str
);
8521 ralloc_free(local_size_str
);
8523 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8524 _mesa_glsl_error(&loc
, state
,
8525 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8527 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8530 total_invocations
*= qual_local_size
[i
];
8531 if (total_invocations
>
8532 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8533 _mesa_glsl_error(&loc
, state
,
8534 "product of local_sizes exceeds "
8535 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8536 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8541 /* If any compute input layout declaration preceded this one, make sure it
8542 * was consistent with this one.
8544 if (state
->cs_input_local_size_specified
) {
8545 for (int i
= 0; i
< 3; i
++) {
8546 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8547 _mesa_glsl_error(&loc
, state
,
8548 "compute shader input layout does not match"
8549 " previous declaration");
8555 /* The ARB_compute_variable_group_size spec says:
8557 * If a compute shader including a *local_size_variable* qualifier also
8558 * declares a fixed local group size using the *local_size_x*,
8559 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8562 if (state
->cs_input_local_size_variable_specified
) {
8563 _mesa_glsl_error(&loc
, state
,
8564 "compute shader can't include both a variable and a "
8565 "fixed local group size");
8569 state
->cs_input_local_size_specified
= true;
8570 for (int i
= 0; i
< 3; i
++)
8571 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8573 /* We may now declare the built-in constant gl_WorkGroupSize (see
8574 * builtin_variable_generator::generate_constants() for why we didn't
8575 * declare it earlier).
8577 ir_variable
*var
= new(state
->symbols
)
8578 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8579 var
->data
.how_declared
= ir_var_declared_implicitly
;
8580 var
->data
.read_only
= true;
8581 instructions
->push_tail(var
);
8582 state
->symbols
->add_variable(var
);
8583 ir_constant_data data
;
8584 memset(&data
, 0, sizeof(data
));
8585 for (int i
= 0; i
< 3; i
++)
8586 data
.u
[i
] = qual_local_size
[i
];
8587 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8588 var
->constant_initializer
=
8589 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8590 var
->data
.has_initializer
= true;
8597 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8598 exec_list
*instructions
)
8600 bool gl_FragColor_assigned
= false;
8601 bool gl_FragData_assigned
= false;
8602 bool gl_FragSecondaryColor_assigned
= false;
8603 bool gl_FragSecondaryData_assigned
= false;
8604 bool user_defined_fs_output_assigned
= false;
8605 ir_variable
*user_defined_fs_output
= NULL
;
8607 /* It would be nice to have proper location information. */
8609 memset(&loc
, 0, sizeof(loc
));
8611 foreach_in_list(ir_instruction
, node
, instructions
) {
8612 ir_variable
*var
= node
->as_variable();
8614 if (!var
|| !var
->data
.assigned
)
8617 if (strcmp(var
->name
, "gl_FragColor") == 0)
8618 gl_FragColor_assigned
= true;
8619 else if (strcmp(var
->name
, "gl_FragData") == 0)
8620 gl_FragData_assigned
= true;
8621 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8622 gl_FragSecondaryColor_assigned
= true;
8623 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8624 gl_FragSecondaryData_assigned
= true;
8625 else if (!is_gl_identifier(var
->name
)) {
8626 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8627 var
->data
.mode
== ir_var_shader_out
) {
8628 user_defined_fs_output_assigned
= true;
8629 user_defined_fs_output
= var
;
8634 /* From the GLSL 1.30 spec:
8636 * "If a shader statically assigns a value to gl_FragColor, it
8637 * may not assign a value to any element of gl_FragData. If a
8638 * shader statically writes a value to any element of
8639 * gl_FragData, it may not assign a value to
8640 * gl_FragColor. That is, a shader may assign values to either
8641 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8642 * linked together must also consistently write just one of
8643 * these variables. Similarly, if user declared output
8644 * variables are in use (statically assigned to), then the
8645 * built-in variables gl_FragColor and gl_FragData may not be
8646 * assigned to. These incorrect usages all generate compile
8649 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8650 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8651 "`gl_FragColor' and `gl_FragData'");
8652 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8653 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8654 "`gl_FragColor' and `%s'",
8655 user_defined_fs_output
->name
);
8656 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8657 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8658 "`gl_FragSecondaryColorEXT' and"
8659 " `gl_FragSecondaryDataEXT'");
8660 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8661 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8662 "`gl_FragColor' and"
8663 " `gl_FragSecondaryDataEXT'");
8664 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8665 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8667 " `gl_FragSecondaryColorEXT'");
8668 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8669 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8670 "`gl_FragData' and `%s'",
8671 user_defined_fs_output
->name
);
8674 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8675 !state
->EXT_blend_func_extended_enable
) {
8676 _mesa_glsl_error(&loc
, state
,
8677 "Dual source blending requires EXT_blend_func_extended");
8683 remove_per_vertex_blocks(exec_list
*instructions
,
8684 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8686 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8687 * if it exists in this shader type.
8689 const glsl_type
*per_vertex
= NULL
;
8691 case ir_var_shader_in
:
8692 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8693 per_vertex
= gl_in
->get_interface_type();
8695 case ir_var_shader_out
:
8696 if (ir_variable
*gl_Position
=
8697 state
->symbols
->get_variable("gl_Position")) {
8698 per_vertex
= gl_Position
->get_interface_type();
8702 assert(!"Unexpected mode");
8706 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8707 * need to do anything.
8709 if (per_vertex
== NULL
)
8712 /* If the interface block is used by the shader, then we don't need to do
8715 interface_block_usage_visitor
v(mode
, per_vertex
);
8716 v
.run(instructions
);
8717 if (v
.usage_found())
8720 /* Remove any ir_variable declarations that refer to the interface block
8723 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8724 ir_variable
*const var
= node
->as_variable();
8725 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8726 var
->data
.mode
== mode
) {
8727 state
->symbols
->disable_variable(var
->name
);