2 * Copyright © 2010 Intel Corporation
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
20 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
21 * DEALINGS IN THE SOFTWARE.
26 * Convert abstract syntax to to high-level intermediate reprensentation (HIR).
28 * During the conversion to HIR, the majority of the symantic checking is
29 * preformed on the program. This includes:
31 * * Symbol table management
35 * The majority of this work could be done during parsing, and the parser could
36 * probably generate HIR directly. However, this results in frequent changes
37 * to the parser code. Since we do not assume that every system this complier
38 * is built on will have Flex and Bison installed, we have to store the code
39 * generated by these tools in our version control system. In other parts of
40 * the system we've seen problems where a parser was changed but the generated
41 * code was not committed, merge conflicts where created because two developers
42 * had slightly different versions of Bison installed, etc.
44 * I have also noticed that running Bison generated parsers in GDB is very
45 * irritating. When you get a segfault on '$$ = $1->foo', you can't very
46 * well 'print $1' in GDB.
48 * As a result, my preference is to put as little C code as possible in the
49 * parser (and lexer) sources.
52 #include "glsl_symbol_table.h"
53 #include "glsl_parser_extras.h"
55 #include "compiler/glsl_types.h"
56 #include "util/hash_table.h"
57 #include "main/macros.h"
58 #include "main/shaderobj.h"
60 #include "ir_builder.h"
61 #include "builtin_functions.h"
63 using namespace ir_builder
;
66 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
67 exec_list
*instructions
);
69 remove_per_vertex_blocks(exec_list
*instructions
,
70 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
73 * Visitor class that finds the first instance of any write-only variable that
74 * is ever read, if any
76 class read_from_write_only_variable_visitor
: public ir_hierarchical_visitor
79 read_from_write_only_variable_visitor() : found(NULL
)
83 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
85 if (this->in_assignee
)
86 return visit_continue
;
88 ir_variable
*var
= ir
->variable_referenced();
89 /* We can have image_write_only set on both images and buffer variables,
90 * but in the former there is a distinction between reads from
91 * the variable itself (write_only) and from the memory they point to
92 * (image_write_only), while in the case of buffer variables there is
93 * no such distinction, that is why this check here is limited to
94 * buffer variables alone.
96 if (!var
|| var
->data
.mode
!= ir_var_shader_storage
)
97 return visit_continue
;
99 if (var
->data
.image_write_only
) {
104 return visit_continue
;
107 ir_variable
*get_variable() {
111 virtual ir_visitor_status
visit_enter(ir_expression
*ir
)
113 /* .length() doesn't actually read anything */
114 if (ir
->operation
== ir_unop_ssbo_unsized_array_length
)
115 return visit_continue_with_parent
;
117 return visit_continue
;
125 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
127 _mesa_glsl_initialize_variables(instructions
, state
);
129 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
131 state
->current_function
= NULL
;
133 state
->toplevel_ir
= instructions
;
135 state
->gs_input_prim_type_specified
= false;
136 state
->tcs_output_vertices_specified
= false;
137 state
->cs_input_local_size_specified
= false;
139 /* Section 4.2 of the GLSL 1.20 specification states:
140 * "The built-in functions are scoped in a scope outside the global scope
141 * users declare global variables in. That is, a shader's global scope,
142 * available for user-defined functions and global variables, is nested
143 * inside the scope containing the built-in functions."
145 * Since built-in functions like ftransform() access built-in variables,
146 * it follows that those must be in the outer scope as well.
148 * We push scope here to create this nesting effect...but don't pop.
149 * This way, a shader's globals are still in the symbol table for use
152 state
->symbols
->push_scope();
154 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
155 ast
->hir(instructions
, state
);
157 detect_recursion_unlinked(state
, instructions
);
158 detect_conflicting_assignments(state
, instructions
);
160 state
->toplevel_ir
= NULL
;
162 /* Move all of the variable declarations to the front of the IR list, and
163 * reverse the order. This has the (intended!) side effect that vertex
164 * shader inputs and fragment shader outputs will appear in the IR in the
165 * same order that they appeared in the shader code. This results in the
166 * locations being assigned in the declared order. Many (arguably buggy)
167 * applications depend on this behavior, and it matches what nearly all
170 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
171 ir_variable
*const var
= node
->as_variable();
177 instructions
->push_head(var
);
180 /* Figure out if gl_FragCoord is actually used in fragment shader */
181 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
183 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
185 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
187 * If multiple shaders using members of a built-in block belonging to
188 * the same interface are linked together in the same program, they
189 * must all redeclare the built-in block in the same way, as described
190 * in section 4.3.7 "Interface Blocks" for interface block matching, or
191 * a link error will result.
193 * The phrase "using members of a built-in block" implies that if two
194 * shaders are linked together and one of them *does not use* any members
195 * of the built-in block, then that shader does not need to have a matching
196 * redeclaration of the built-in block.
198 * This appears to be a clarification to the behaviour established for
199 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
202 * The definition of "interface" in section 4.3.7 that applies here is as
205 * The boundary between adjacent programmable pipeline stages: This
206 * spans all the outputs in all compilation units of the first stage
207 * and all the inputs in all compilation units of the second stage.
209 * Therefore this rule applies to both inter- and intra-stage linking.
211 * The easiest way to implement this is to check whether the shader uses
212 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
213 * remove all the relevant variable declaration from the IR, so that the
214 * linker won't see them and complain about mismatches.
216 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
217 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
219 /* Check that we don't have reads from write-only variables */
220 read_from_write_only_variable_visitor v
;
222 ir_variable
*error_var
= v
.get_variable();
224 /* It would be nice to have proper location information, but for that
225 * we would need to check this as we process each kind of AST node
228 memset(&loc
, 0, sizeof(loc
));
229 _mesa_glsl_error(&loc
, state
, "Read from write-only variable `%s'",
235 static ir_expression_operation
236 get_implicit_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
237 struct _mesa_glsl_parse_state
*state
)
239 switch (to
->base_type
) {
240 case GLSL_TYPE_FLOAT
:
241 switch (from
->base_type
) {
242 case GLSL_TYPE_INT
: return ir_unop_i2f
;
243 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
244 default: return (ir_expression_operation
)0;
248 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
249 && !state
->MESA_shader_integer_functions_enable
)
250 return (ir_expression_operation
)0;
251 switch (from
->base_type
) {
252 case GLSL_TYPE_INT
: return ir_unop_i2u
;
253 default: return (ir_expression_operation
)0;
256 case GLSL_TYPE_DOUBLE
:
257 if (!state
->has_double())
258 return (ir_expression_operation
)0;
259 switch (from
->base_type
) {
260 case GLSL_TYPE_INT
: return ir_unop_i2d
;
261 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
262 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
263 case GLSL_TYPE_INT64
: return ir_unop_i642d
;
264 case GLSL_TYPE_UINT64
: return ir_unop_u642d
;
265 default: return (ir_expression_operation
)0;
268 case GLSL_TYPE_UINT64
:
269 if (!state
->has_int64())
270 return (ir_expression_operation
)0;
271 switch (from
->base_type
) {
272 case GLSL_TYPE_INT
: return ir_unop_i2u64
;
273 case GLSL_TYPE_UINT
: return ir_unop_u2u64
;
274 case GLSL_TYPE_INT64
: return ir_unop_i642u64
;
275 default: return (ir_expression_operation
)0;
278 case GLSL_TYPE_INT64
:
279 if (!state
->has_int64())
280 return (ir_expression_operation
)0;
281 switch (from
->base_type
) {
282 case GLSL_TYPE_INT
: return ir_unop_i2i64
;
283 default: return (ir_expression_operation
)0;
286 default: return (ir_expression_operation
)0;
292 * If a conversion is available, convert one operand to a different type
294 * The \c from \c ir_rvalue is converted "in place".
296 * \param to Type that the operand it to be converted to
297 * \param from Operand that is being converted
298 * \param state GLSL compiler state
301 * If a conversion is possible (or unnecessary), \c true is returned.
302 * Otherwise \c false is returned.
305 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
306 struct _mesa_glsl_parse_state
*state
)
309 if (to
->base_type
== from
->type
->base_type
)
312 /* Prior to GLSL 1.20, there are no implicit conversions */
313 if (!state
->is_version(120, 0))
316 /* ESSL does not allow implicit conversions */
317 if (state
->es_shader
)
320 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
322 * "There are no implicit array or structure conversions. For
323 * example, an array of int cannot be implicitly converted to an
326 if (!to
->is_numeric() || !from
->type
->is_numeric())
329 /* We don't actually want the specific type `to`, we want a type
330 * with the same base type as `to`, but the same vector width as
333 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
334 from
->type
->matrix_columns
);
336 ir_expression_operation op
= get_implicit_conversion_operation(to
, from
->type
, state
);
338 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
346 static const struct glsl_type
*
347 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
349 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
351 const glsl_type
*type_a
= value_a
->type
;
352 const glsl_type
*type_b
= value_b
->type
;
354 /* From GLSL 1.50 spec, page 56:
356 * "The arithmetic binary operators add (+), subtract (-),
357 * multiply (*), and divide (/) operate on integer and
358 * floating-point scalars, vectors, and matrices."
360 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
361 _mesa_glsl_error(loc
, state
,
362 "operands to arithmetic operators must be numeric");
363 return glsl_type::error_type
;
367 /* "If one operand is floating-point based and the other is
368 * not, then the conversions from Section 4.1.10 "Implicit
369 * Conversions" are applied to the non-floating-point-based operand."
371 if (!apply_implicit_conversion(type_a
, value_b
, state
)
372 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
373 _mesa_glsl_error(loc
, state
,
374 "could not implicitly convert operands to "
375 "arithmetic operator");
376 return glsl_type::error_type
;
378 type_a
= value_a
->type
;
379 type_b
= value_b
->type
;
381 /* "If the operands are integer types, they must both be signed or
384 * From this rule and the preceeding conversion it can be inferred that
385 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
386 * The is_numeric check above already filtered out the case where either
387 * type is not one of these, so now the base types need only be tested for
390 if (type_a
->base_type
!= type_b
->base_type
) {
391 _mesa_glsl_error(loc
, state
,
392 "base type mismatch for arithmetic operator");
393 return glsl_type::error_type
;
396 /* "All arithmetic binary operators result in the same fundamental type
397 * (signed integer, unsigned integer, or floating-point) as the
398 * operands they operate on, after operand type conversion. After
399 * conversion, the following cases are valid
401 * * The two operands are scalars. In this case the operation is
402 * applied, resulting in a scalar."
404 if (type_a
->is_scalar() && type_b
->is_scalar())
407 /* "* One operand is a scalar, and the other is a vector or matrix.
408 * In this case, the scalar operation is applied independently to each
409 * component of the vector or matrix, resulting in the same size
412 if (type_a
->is_scalar()) {
413 if (!type_b
->is_scalar())
415 } else if (type_b
->is_scalar()) {
419 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
420 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
423 assert(!type_a
->is_scalar());
424 assert(!type_b
->is_scalar());
426 /* "* The two operands are vectors of the same size. In this case, the
427 * operation is done component-wise resulting in the same size
430 if (type_a
->is_vector() && type_b
->is_vector()) {
431 if (type_a
== type_b
) {
434 _mesa_glsl_error(loc
, state
,
435 "vector size mismatch for arithmetic operator");
436 return glsl_type::error_type
;
440 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
441 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
442 * <vector, vector> have been handled. At least one of the operands must
443 * be matrix. Further, since there are no integer matrix types, the base
444 * type of both operands must be float.
446 assert(type_a
->is_matrix() || type_b
->is_matrix());
447 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
||
448 type_a
->base_type
== GLSL_TYPE_DOUBLE
);
449 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
||
450 type_b
->base_type
== GLSL_TYPE_DOUBLE
);
452 /* "* The operator is add (+), subtract (-), or divide (/), and the
453 * operands are matrices with the same number of rows and the same
454 * number of columns. In this case, the operation is done component-
455 * wise resulting in the same size matrix."
456 * * The operator is multiply (*), where both operands are matrices or
457 * one operand is a vector and the other a matrix. A right vector
458 * operand is treated as a column vector and a left vector operand as a
459 * row vector. In all these cases, it is required that the number of
460 * columns of the left operand is equal to the number of rows of the
461 * right operand. Then, the multiply (*) operation does a linear
462 * algebraic multiply, yielding an object that has the same number of
463 * rows as the left operand and the same number of columns as the right
464 * operand. Section 5.10 "Vector and Matrix Operations" explains in
465 * more detail how vectors and matrices are operated on."
468 if (type_a
== type_b
)
471 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
473 if (type
== glsl_type::error_type
) {
474 _mesa_glsl_error(loc
, state
,
475 "size mismatch for matrix multiplication");
482 /* "All other cases are illegal."
484 _mesa_glsl_error(loc
, state
, "type mismatch");
485 return glsl_type::error_type
;
489 static const struct glsl_type
*
490 unary_arithmetic_result_type(const struct glsl_type
*type
,
491 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
493 /* From GLSL 1.50 spec, page 57:
495 * "The arithmetic unary operators negate (-), post- and pre-increment
496 * and decrement (-- and ++) operate on integer or floating-point
497 * values (including vectors and matrices). All unary operators work
498 * component-wise on their operands. These result with the same type
501 if (!type
->is_numeric()) {
502 _mesa_glsl_error(loc
, state
,
503 "operands to arithmetic operators must be numeric");
504 return glsl_type::error_type
;
511 * \brief Return the result type of a bit-logic operation.
513 * If the given types to the bit-logic operator are invalid, return
514 * glsl_type::error_type.
516 * \param value_a LHS of bit-logic op
517 * \param value_b RHS of bit-logic op
519 static const struct glsl_type
*
520 bit_logic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
522 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
524 const glsl_type
*type_a
= value_a
->type
;
525 const glsl_type
*type_b
= value_b
->type
;
527 if (!state
->check_bitwise_operations_allowed(loc
)) {
528 return glsl_type::error_type
;
531 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
533 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
534 * (|). The operands must be of type signed or unsigned integers or
537 if (!type_a
->is_integer_32_64()) {
538 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
539 ast_expression::operator_string(op
));
540 return glsl_type::error_type
;
542 if (!type_b
->is_integer_32_64()) {
543 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
544 ast_expression::operator_string(op
));
545 return glsl_type::error_type
;
548 /* Prior to GLSL 4.0 / GL_ARB_gpu_shader5, implicit conversions didn't
549 * make sense for bitwise operations, as they don't operate on floats.
551 * GLSL 4.0 added implicit int -> uint conversions, which are relevant
552 * here. It wasn't clear whether or not we should apply them to bitwise
553 * operations. However, Khronos has decided that they should in future
554 * language revisions. Applications also rely on this behavior. We opt
555 * to apply them in general, but issue a portability warning.
557 * See https://www.khronos.org/bugzilla/show_bug.cgi?id=1405
559 if (type_a
->base_type
!= type_b
->base_type
) {
560 if (!apply_implicit_conversion(type_a
, value_b
, state
)
561 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
562 _mesa_glsl_error(loc
, state
,
563 "could not implicitly convert operands to "
565 ast_expression::operator_string(op
));
566 return glsl_type::error_type
;
568 _mesa_glsl_warning(loc
, state
,
569 "some implementations may not support implicit "
570 "int -> uint conversions for `%s' operators; "
571 "consider casting explicitly for portability",
572 ast_expression::operator_string(op
));
574 type_a
= value_a
->type
;
575 type_b
= value_b
->type
;
578 /* "The fundamental types of the operands (signed or unsigned) must
581 if (type_a
->base_type
!= type_b
->base_type
) {
582 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
583 "base type", ast_expression::operator_string(op
));
584 return glsl_type::error_type
;
587 /* "The operands cannot be vectors of differing size." */
588 if (type_a
->is_vector() &&
589 type_b
->is_vector() &&
590 type_a
->vector_elements
!= type_b
->vector_elements
) {
591 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
592 "different sizes", ast_expression::operator_string(op
));
593 return glsl_type::error_type
;
596 /* "If one operand is a scalar and the other a vector, the scalar is
597 * applied component-wise to the vector, resulting in the same type as
598 * the vector. The fundamental types of the operands [...] will be the
599 * resulting fundamental type."
601 if (type_a
->is_scalar())
607 static const struct glsl_type
*
608 modulus_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
609 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
611 const glsl_type
*type_a
= value_a
->type
;
612 const glsl_type
*type_b
= value_b
->type
;
614 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
615 return glsl_type::error_type
;
618 /* Section 5.9 (Expressions) of the GLSL 4.00 specification says:
620 * "The operator modulus (%) operates on signed or unsigned integers or
623 if (!type_a
->is_integer_32_64()) {
624 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
625 return glsl_type::error_type
;
627 if (!type_b
->is_integer_32_64()) {
628 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
629 return glsl_type::error_type
;
632 /* "If the fundamental types in the operands do not match, then the
633 * conversions from section 4.1.10 "Implicit Conversions" are applied
634 * to create matching types."
636 * Note that GLSL 4.00 (and GL_ARB_gpu_shader5) introduced implicit
637 * int -> uint conversion rules. Prior to that, there were no implicit
638 * conversions. So it's harmless to apply them universally - no implicit
639 * conversions will exist. If the types don't match, we'll receive false,
640 * and raise an error, satisfying the GLSL 1.50 spec, page 56:
642 * "The operand types must both be signed or unsigned."
644 if (!apply_implicit_conversion(type_a
, value_b
, state
) &&
645 !apply_implicit_conversion(type_b
, value_a
, state
)) {
646 _mesa_glsl_error(loc
, state
,
647 "could not implicitly convert operands to "
648 "modulus (%%) operator");
649 return glsl_type::error_type
;
651 type_a
= value_a
->type
;
652 type_b
= value_b
->type
;
654 /* "The operands cannot be vectors of differing size. If one operand is
655 * a scalar and the other vector, then the scalar is applied component-
656 * wise to the vector, resulting in the same type as the vector. If both
657 * are vectors of the same size, the result is computed component-wise."
659 if (type_a
->is_vector()) {
660 if (!type_b
->is_vector()
661 || (type_a
->vector_elements
== type_b
->vector_elements
))
666 /* "The operator modulus (%) is not defined for any other data types
667 * (non-integer types)."
669 _mesa_glsl_error(loc
, state
, "type mismatch");
670 return glsl_type::error_type
;
674 static const struct glsl_type
*
675 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
676 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
678 const glsl_type
*type_a
= value_a
->type
;
679 const glsl_type
*type_b
= value_b
->type
;
681 /* From GLSL 1.50 spec, page 56:
682 * "The relational operators greater than (>), less than (<), greater
683 * than or equal (>=), and less than or equal (<=) operate only on
684 * scalar integer and scalar floating-point expressions."
686 if (!type_a
->is_numeric()
687 || !type_b
->is_numeric()
688 || !type_a
->is_scalar()
689 || !type_b
->is_scalar()) {
690 _mesa_glsl_error(loc
, state
,
691 "operands to relational operators must be scalar and "
693 return glsl_type::error_type
;
696 /* "Either the operands' types must match, or the conversions from
697 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
698 * operand, after which the types must match."
700 if (!apply_implicit_conversion(type_a
, value_b
, state
)
701 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
702 _mesa_glsl_error(loc
, state
,
703 "could not implicitly convert operands to "
704 "relational operator");
705 return glsl_type::error_type
;
707 type_a
= value_a
->type
;
708 type_b
= value_b
->type
;
710 if (type_a
->base_type
!= type_b
->base_type
) {
711 _mesa_glsl_error(loc
, state
, "base type mismatch");
712 return glsl_type::error_type
;
715 /* "The result is scalar Boolean."
717 return glsl_type::bool_type
;
721 * \brief Return the result type of a bit-shift operation.
723 * If the given types to the bit-shift operator are invalid, return
724 * glsl_type::error_type.
726 * \param type_a Type of LHS of bit-shift op
727 * \param type_b Type of RHS of bit-shift op
729 static const struct glsl_type
*
730 shift_result_type(const struct glsl_type
*type_a
,
731 const struct glsl_type
*type_b
,
733 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
735 if (!state
->check_bitwise_operations_allowed(loc
)) {
736 return glsl_type::error_type
;
739 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
741 * "The shift operators (<<) and (>>). For both operators, the operands
742 * must be signed or unsigned integers or integer vectors. One operand
743 * can be signed while the other is unsigned."
745 if (!type_a
->is_integer_32_64()) {
746 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
747 "integer vector", ast_expression::operator_string(op
));
748 return glsl_type::error_type
;
751 if (!type_b
->is_integer()) {
752 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
753 "integer vector", ast_expression::operator_string(op
));
754 return glsl_type::error_type
;
757 /* "If the first operand is a scalar, the second operand has to be
760 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
761 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
762 "second must be scalar as well",
763 ast_expression::operator_string(op
));
764 return glsl_type::error_type
;
767 /* If both operands are vectors, check that they have same number of
770 if (type_a
->is_vector() &&
771 type_b
->is_vector() &&
772 type_a
->vector_elements
!= type_b
->vector_elements
) {
773 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
774 "have same number of elements",
775 ast_expression::operator_string(op
));
776 return glsl_type::error_type
;
779 /* "In all cases, the resulting type will be the same type as the left
786 * Returns the innermost array index expression in an rvalue tree.
787 * This is the largest indexing level -- if an array of blocks, then
788 * it is the block index rather than an indexing expression for an
789 * array-typed member of an array of blocks.
792 find_innermost_array_index(ir_rvalue
*rv
)
794 ir_dereference_array
*last
= NULL
;
796 if (rv
->as_dereference_array()) {
797 last
= rv
->as_dereference_array();
799 } else if (rv
->as_dereference_record())
800 rv
= rv
->as_dereference_record()->record
;
801 else if (rv
->as_swizzle())
802 rv
= rv
->as_swizzle()->val
;
808 return last
->array_index
;
814 * Validates that a value can be assigned to a location with a specified type
816 * Validates that \c rhs can be assigned to some location. If the types are
817 * not an exact match but an automatic conversion is possible, \c rhs will be
821 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
822 * Otherwise the actual RHS to be assigned will be returned. This may be
823 * \c rhs, or it may be \c rhs after some type conversion.
826 * In addition to being used for assignments, this function is used to
827 * type-check return values.
830 validate_assignment(struct _mesa_glsl_parse_state
*state
,
831 YYLTYPE loc
, ir_rvalue
*lhs
,
832 ir_rvalue
*rhs
, bool is_initializer
)
834 /* If there is already some error in the RHS, just return it. Anything
835 * else will lead to an avalanche of error message back to the user.
837 if (rhs
->type
->is_error())
840 /* In the Tessellation Control Shader:
841 * If a per-vertex output variable is used as an l-value, it is an error
842 * if the expression indicating the vertex number is not the identifier
845 if (state
->stage
== MESA_SHADER_TESS_CTRL
&& !lhs
->type
->is_error()) {
846 ir_variable
*var
= lhs
->variable_referenced();
847 if (var
&& var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
848 ir_rvalue
*index
= find_innermost_array_index(lhs
);
849 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
850 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
851 _mesa_glsl_error(&loc
, state
,
852 "Tessellation control shader outputs can only "
853 "be indexed by gl_InvocationID");
859 /* If the types are identical, the assignment can trivially proceed.
861 if (rhs
->type
== lhs
->type
)
864 /* If the array element types are the same and the LHS is unsized,
865 * the assignment is okay for initializers embedded in variable
868 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
869 * is handled by ir_dereference::is_lvalue.
871 const glsl_type
*lhs_t
= lhs
->type
;
872 const glsl_type
*rhs_t
= rhs
->type
;
873 bool unsized_array
= false;
874 while(lhs_t
->is_array()) {
876 break; /* the rest of the inner arrays match so break out early */
877 if (!rhs_t
->is_array()) {
878 unsized_array
= false;
879 break; /* number of dimensions mismatch */
881 if (lhs_t
->length
== rhs_t
->length
) {
882 lhs_t
= lhs_t
->fields
.array
;
883 rhs_t
= rhs_t
->fields
.array
;
885 } else if (lhs_t
->is_unsized_array()) {
886 unsized_array
= true;
888 unsized_array
= false;
889 break; /* sized array mismatch */
891 lhs_t
= lhs_t
->fields
.array
;
892 rhs_t
= rhs_t
->fields
.array
;
895 if (is_initializer
) {
898 _mesa_glsl_error(&loc
, state
,
899 "implicitly sized arrays cannot be assigned");
904 /* Check for implicit conversion in GLSL 1.20 */
905 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
906 if (rhs
->type
== lhs
->type
)
910 _mesa_glsl_error(&loc
, state
,
911 "%s of type %s cannot be assigned to "
912 "variable of type %s",
913 is_initializer
? "initializer" : "value",
914 rhs
->type
->name
, lhs
->type
->name
);
920 mark_whole_array_access(ir_rvalue
*access
)
922 ir_dereference_variable
*deref
= access
->as_dereference_variable();
924 if (deref
&& deref
->var
) {
925 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
930 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
931 const char *non_lvalue_description
,
932 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
933 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
938 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
940 ir_variable
*lhs_var
= lhs
->variable_referenced();
942 lhs_var
->data
.assigned
= true;
944 if (!error_emitted
) {
945 if (non_lvalue_description
!= NULL
) {
946 _mesa_glsl_error(&lhs_loc
, state
,
948 non_lvalue_description
);
949 error_emitted
= true;
950 } else if (lhs_var
!= NULL
&& (lhs_var
->data
.read_only
||
951 (lhs_var
->data
.mode
== ir_var_shader_storage
&&
952 lhs_var
->data
.image_read_only
))) {
953 /* We can have image_read_only set on both images and buffer variables,
954 * but in the former there is a distinction between assignments to
955 * the variable itself (read_only) and to the memory they point to
956 * (image_read_only), while in the case of buffer variables there is
957 * no such distinction, that is why this check here is limited to
958 * buffer variables alone.
960 _mesa_glsl_error(&lhs_loc
, state
,
961 "assignment to read-only variable '%s'",
963 error_emitted
= true;
964 } else if (lhs
->type
->is_array() &&
965 !state
->check_version(120, 300, &lhs_loc
,
966 "whole array assignment forbidden")) {
967 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
969 * "Other binary or unary expressions, non-dereferenced
970 * arrays, function names, swizzles with repeated fields,
971 * and constants cannot be l-values."
973 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
975 error_emitted
= true;
976 } else if (!lhs
->is_lvalue()) {
977 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
978 error_emitted
= true;
983 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
984 if (new_rhs
!= NULL
) {
987 /* If the LHS array was not declared with a size, it takes it size from
988 * the RHS. If the LHS is an l-value and a whole array, it must be a
989 * dereference of a variable. Any other case would require that the LHS
990 * is either not an l-value or not a whole array.
992 if (lhs
->type
->is_unsized_array()) {
993 ir_dereference
*const d
= lhs
->as_dereference();
997 ir_variable
*const var
= d
->variable_referenced();
1001 if (var
->data
.max_array_access
>= rhs
->type
->array_size()) {
1002 /* FINISHME: This should actually log the location of the RHS. */
1003 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
1005 var
->data
.max_array_access
);
1008 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
1009 rhs
->type
->array_size());
1010 d
->type
= var
->type
;
1012 if (lhs
->type
->is_array()) {
1013 mark_whole_array_access(rhs
);
1014 mark_whole_array_access(lhs
);
1018 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
1019 * but not post_inc) need the converted assigned value as an rvalue
1020 * to handle things like:
1026 if (!error_emitted
) {
1027 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
1029 instructions
->push_tail(var
);
1030 instructions
->push_tail(assign(var
, rhs
));
1032 ir_dereference_variable
*deref_var
=
1033 new(ctx
) ir_dereference_variable(var
);
1034 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
1035 rvalue
= new(ctx
) ir_dereference_variable(var
);
1037 rvalue
= ir_rvalue::error_value(ctx
);
1039 *out_rvalue
= rvalue
;
1042 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
1046 return error_emitted
;
1050 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
1052 void *ctx
= ralloc_parent(lvalue
);
1055 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
1057 instructions
->push_tail(var
);
1059 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
1062 return new(ctx
) ir_dereference_variable(var
);
1067 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
1069 (void) instructions
;
1076 ast_node::has_sequence_subexpression() const
1082 ast_node::set_is_lhs(bool /* new_value */)
1087 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
1088 struct _mesa_glsl_parse_state
*state
)
1090 (void)hir(instructions
, state
);
1094 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
1095 struct _mesa_glsl_parse_state
*state
)
1097 (void)hir(instructions
, state
);
1101 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
1104 ir_rvalue
*cmp
= NULL
;
1106 if (operation
== ir_binop_all_equal
)
1107 join_op
= ir_binop_logic_and
;
1109 join_op
= ir_binop_logic_or
;
1111 switch (op0
->type
->base_type
) {
1112 case GLSL_TYPE_FLOAT
:
1113 case GLSL_TYPE_UINT
:
1115 case GLSL_TYPE_BOOL
:
1116 case GLSL_TYPE_DOUBLE
:
1117 case GLSL_TYPE_UINT64
:
1118 case GLSL_TYPE_INT64
:
1119 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
1121 case GLSL_TYPE_ARRAY
: {
1122 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1123 ir_rvalue
*e0
, *e1
, *result
;
1125 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
1126 new(mem_ctx
) ir_constant(i
));
1127 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
1128 new(mem_ctx
) ir_constant(i
));
1129 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1132 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1138 mark_whole_array_access(op0
);
1139 mark_whole_array_access(op1
);
1143 case GLSL_TYPE_STRUCT
: {
1144 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
1145 ir_rvalue
*e0
, *e1
, *result
;
1146 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1148 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1150 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1152 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1155 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1163 case GLSL_TYPE_ERROR
:
1164 case GLSL_TYPE_VOID
:
1165 case GLSL_TYPE_SAMPLER
:
1166 case GLSL_TYPE_IMAGE
:
1167 case GLSL_TYPE_INTERFACE
:
1168 case GLSL_TYPE_ATOMIC_UINT
:
1169 case GLSL_TYPE_SUBROUTINE
:
1170 case GLSL_TYPE_FUNCTION
:
1171 /* I assume a comparison of a struct containing a sampler just
1172 * ignores the sampler present in the type.
1178 cmp
= new(mem_ctx
) ir_constant(true);
1183 /* For logical operations, we want to ensure that the operands are
1184 * scalar booleans. If it isn't, emit an error and return a constant
1185 * boolean to avoid triggering cascading error messages.
1188 get_scalar_boolean_operand(exec_list
*instructions
,
1189 struct _mesa_glsl_parse_state
*state
,
1190 ast_expression
*parent_expr
,
1192 const char *operand_name
,
1193 bool *error_emitted
)
1195 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1197 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1199 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1202 if (!*error_emitted
) {
1203 YYLTYPE loc
= expr
->get_location();
1204 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1206 parent_expr
->operator_string(parent_expr
->oper
));
1207 *error_emitted
= true;
1210 return new(ctx
) ir_constant(true);
1214 * If name refers to a builtin array whose maximum allowed size is less than
1215 * size, report an error and return true. Otherwise return false.
1218 check_builtin_array_max_size(const char *name
, unsigned size
,
1219 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1221 if ((strcmp("gl_TexCoord", name
) == 0)
1222 && (size
> state
->Const
.MaxTextureCoords
)) {
1223 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1225 * "The size [of gl_TexCoord] can be at most
1226 * gl_MaxTextureCoords."
1228 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1229 "be larger than gl_MaxTextureCoords (%u)",
1230 state
->Const
.MaxTextureCoords
);
1231 } else if (strcmp("gl_ClipDistance", name
) == 0) {
1232 state
->clip_dist_size
= size
;
1233 if (size
+ state
->cull_dist_size
> state
->Const
.MaxClipPlanes
) {
1234 /* From section 7.1 (Vertex Shader Special Variables) of the
1237 * "The gl_ClipDistance array is predeclared as unsized and
1238 * must be sized by the shader either redeclaring it with a
1239 * size or indexing it only with integral constant
1240 * expressions. ... The size can be at most
1241 * gl_MaxClipDistances."
1243 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1244 "be larger than gl_MaxClipDistances (%u)",
1245 state
->Const
.MaxClipPlanes
);
1247 } else if (strcmp("gl_CullDistance", name
) == 0) {
1248 state
->cull_dist_size
= size
;
1249 if (size
+ state
->clip_dist_size
> state
->Const
.MaxClipPlanes
) {
1250 /* From the ARB_cull_distance spec:
1252 * "The gl_CullDistance array is predeclared as unsized and
1253 * must be sized by the shader either redeclaring it with
1254 * a size or indexing it only with integral constant
1255 * expressions. The size determines the number and set of
1256 * enabled cull distances and can be at most
1257 * gl_MaxCullDistances."
1259 _mesa_glsl_error(&loc
, state
, "`gl_CullDistance' array size cannot "
1260 "be larger than gl_MaxCullDistances (%u)",
1261 state
->Const
.MaxClipPlanes
);
1267 * Create the constant 1, of a which is appropriate for incrementing and
1268 * decrementing values of the given GLSL type. For example, if type is vec4,
1269 * this creates a constant value of 1.0 having type float.
1271 * If the given type is invalid for increment and decrement operators, return
1272 * a floating point 1--the error will be detected later.
1275 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1277 switch (type
->base_type
) {
1278 case GLSL_TYPE_UINT
:
1279 return new(ctx
) ir_constant((unsigned) 1);
1281 return new(ctx
) ir_constant(1);
1282 case GLSL_TYPE_UINT64
:
1283 return new(ctx
) ir_constant((uint64_t) 1);
1284 case GLSL_TYPE_INT64
:
1285 return new(ctx
) ir_constant((int64_t) 1);
1287 case GLSL_TYPE_FLOAT
:
1288 return new(ctx
) ir_constant(1.0f
);
1293 ast_expression::hir(exec_list
*instructions
,
1294 struct _mesa_glsl_parse_state
*state
)
1296 return do_hir(instructions
, state
, true);
1300 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1301 struct _mesa_glsl_parse_state
*state
)
1303 do_hir(instructions
, state
, false);
1307 ast_expression::set_is_lhs(bool new_value
)
1309 /* is_lhs is tracked only to print "variable used uninitialized" warnings,
1310 * if we lack an identifier we can just skip it.
1312 if (this->primary_expression
.identifier
== NULL
)
1315 this->is_lhs
= new_value
;
1317 /* We need to go through the subexpressions tree to cover cases like
1318 * ast_field_selection
1320 if (this->subexpressions
[0] != NULL
)
1321 this->subexpressions
[0]->set_is_lhs(new_value
);
1325 ast_expression::do_hir(exec_list
*instructions
,
1326 struct _mesa_glsl_parse_state
*state
,
1330 static const int operations
[AST_NUM_OPERATORS
] = {
1331 -1, /* ast_assign doesn't convert to ir_expression. */
1332 -1, /* ast_plus doesn't convert to ir_expression. */
1346 ir_binop_any_nequal
,
1356 /* Note: The following block of expression types actually convert
1357 * to multiple IR instructions.
1359 ir_binop_mul
, /* ast_mul_assign */
1360 ir_binop_div
, /* ast_div_assign */
1361 ir_binop_mod
, /* ast_mod_assign */
1362 ir_binop_add
, /* ast_add_assign */
1363 ir_binop_sub
, /* ast_sub_assign */
1364 ir_binop_lshift
, /* ast_ls_assign */
1365 ir_binop_rshift
, /* ast_rs_assign */
1366 ir_binop_bit_and
, /* ast_and_assign */
1367 ir_binop_bit_xor
, /* ast_xor_assign */
1368 ir_binop_bit_or
, /* ast_or_assign */
1370 -1, /* ast_conditional doesn't convert to ir_expression. */
1371 ir_binop_add
, /* ast_pre_inc. */
1372 ir_binop_sub
, /* ast_pre_dec. */
1373 ir_binop_add
, /* ast_post_inc. */
1374 ir_binop_sub
, /* ast_post_dec. */
1375 -1, /* ast_field_selection doesn't conv to ir_expression. */
1376 -1, /* ast_array_index doesn't convert to ir_expression. */
1377 -1, /* ast_function_call doesn't conv to ir_expression. */
1378 -1, /* ast_identifier doesn't convert to ir_expression. */
1379 -1, /* ast_int_constant doesn't convert to ir_expression. */
1380 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1381 -1, /* ast_float_constant doesn't conv to ir_expression. */
1382 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1383 -1, /* ast_sequence doesn't convert to ir_expression. */
1384 -1, /* ast_aggregate shouldn't ever even get here. */
1386 ir_rvalue
*result
= NULL
;
1388 const struct glsl_type
*type
, *orig_type
;
1389 bool error_emitted
= false;
1392 loc
= this->get_location();
1394 switch (this->oper
) {
1396 assert(!"ast_aggregate: Should never get here.");
1400 this->subexpressions
[0]->set_is_lhs(true);
1401 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1402 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1405 do_assignment(instructions
, state
,
1406 this->subexpressions
[0]->non_lvalue_description
,
1407 op
[0], op
[1], &result
, needs_rvalue
, false,
1408 this->subexpressions
[0]->get_location());
1413 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1415 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1417 error_emitted
= type
->is_error();
1423 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1425 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1427 error_emitted
= type
->is_error();
1429 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1437 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1438 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1440 type
= arithmetic_result_type(op
[0], op
[1],
1441 (this->oper
== ast_mul
),
1443 error_emitted
= type
->is_error();
1445 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1450 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1451 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1453 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1455 assert(operations
[this->oper
] == ir_binop_mod
);
1457 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1459 error_emitted
= type
->is_error();
1464 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1465 error_emitted
= true;
1468 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1469 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1470 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1472 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1474 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1481 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1482 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1484 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1486 /* The relational operators must either generate an error or result
1487 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1489 assert(type
->is_error()
1490 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1491 && type
->is_scalar()));
1493 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1495 error_emitted
= type
->is_error();
1500 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1501 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1503 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1505 * "The equality operators equal (==), and not equal (!=)
1506 * operate on all types. They result in a scalar Boolean. If
1507 * the operand types do not match, then there must be a
1508 * conversion from Section 4.1.10 "Implicit Conversions"
1509 * applied to one operand that can make them match, in which
1510 * case this conversion is done."
1513 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1514 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1515 "no operation `%1$s' exists that takes a left-hand "
1516 "operand of type 'void' or a right operand of type "
1517 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1518 error_emitted
= true;
1519 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1520 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1521 || (op
[0]->type
!= op
[1]->type
)) {
1522 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1523 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1524 error_emitted
= true;
1525 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1526 !state
->check_version(120, 300, &loc
,
1527 "array comparisons forbidden")) {
1528 error_emitted
= true;
1529 } else if ((op
[0]->type
->contains_subroutine() ||
1530 op
[1]->type
->contains_subroutine())) {
1531 _mesa_glsl_error(&loc
, state
, "subroutine comparisons forbidden");
1532 error_emitted
= true;
1533 } else if ((op
[0]->type
->contains_opaque() ||
1534 op
[1]->type
->contains_opaque())) {
1535 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1536 error_emitted
= true;
1539 if (error_emitted
) {
1540 result
= new(ctx
) ir_constant(false);
1542 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1543 assert(result
->type
== glsl_type::bool_type
);
1550 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1551 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1552 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1553 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1555 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1559 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1561 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1562 error_emitted
= true;
1565 if (!op
[0]->type
->is_integer_32_64()) {
1566 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1567 error_emitted
= true;
1570 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1571 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1574 case ast_logic_and
: {
1575 exec_list rhs_instructions
;
1576 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1577 "LHS", &error_emitted
);
1578 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1579 "RHS", &error_emitted
);
1581 if (rhs_instructions
.is_empty()) {
1582 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1583 type
= result
->type
;
1585 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1588 instructions
->push_tail(tmp
);
1590 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1591 instructions
->push_tail(stmt
);
1593 stmt
->then_instructions
.append_list(&rhs_instructions
);
1594 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1595 ir_assignment
*const then_assign
=
1596 new(ctx
) ir_assignment(then_deref
, op
[1]);
1597 stmt
->then_instructions
.push_tail(then_assign
);
1599 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1600 ir_assignment
*const else_assign
=
1601 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1602 stmt
->else_instructions
.push_tail(else_assign
);
1604 result
= new(ctx
) ir_dereference_variable(tmp
);
1610 case ast_logic_or
: {
1611 exec_list rhs_instructions
;
1612 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1613 "LHS", &error_emitted
);
1614 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1615 "RHS", &error_emitted
);
1617 if (rhs_instructions
.is_empty()) {
1618 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1619 type
= result
->type
;
1621 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1624 instructions
->push_tail(tmp
);
1626 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1627 instructions
->push_tail(stmt
);
1629 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1630 ir_assignment
*const then_assign
=
1631 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1632 stmt
->then_instructions
.push_tail(then_assign
);
1634 stmt
->else_instructions
.append_list(&rhs_instructions
);
1635 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1636 ir_assignment
*const else_assign
=
1637 new(ctx
) ir_assignment(else_deref
, op
[1]);
1638 stmt
->else_instructions
.push_tail(else_assign
);
1640 result
= new(ctx
) ir_dereference_variable(tmp
);
1647 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1649 * "The logical binary operators and (&&), or ( | | ), and
1650 * exclusive or (^^). They operate only on two Boolean
1651 * expressions and result in a Boolean expression."
1653 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1655 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1658 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1663 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1664 "operand", &error_emitted
);
1666 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1670 case ast_mul_assign
:
1671 case ast_div_assign
:
1672 case ast_add_assign
:
1673 case ast_sub_assign
: {
1674 this->subexpressions
[0]->set_is_lhs(true);
1675 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1676 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1678 orig_type
= op
[0]->type
;
1679 type
= arithmetic_result_type(op
[0], op
[1],
1680 (this->oper
== ast_mul_assign
),
1683 if (type
!= orig_type
) {
1684 _mesa_glsl_error(& loc
, state
,
1685 "could not implicitly convert "
1686 "%s to %s", type
->name
, orig_type
->name
);
1687 type
= glsl_type::error_type
;
1690 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1694 do_assignment(instructions
, state
,
1695 this->subexpressions
[0]->non_lvalue_description
,
1696 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1697 &result
, needs_rvalue
, false,
1698 this->subexpressions
[0]->get_location());
1700 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1701 * explicitly test for this because none of the binary expression
1702 * operators allow array operands either.
1708 case ast_mod_assign
: {
1709 this->subexpressions
[0]->set_is_lhs(true);
1710 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1711 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1713 orig_type
= op
[0]->type
;
1714 type
= modulus_result_type(op
[0], op
[1], state
, &loc
);
1716 if (type
!= orig_type
) {
1717 _mesa_glsl_error(& loc
, state
,
1718 "could not implicitly convert "
1719 "%s to %s", type
->name
, orig_type
->name
);
1720 type
= glsl_type::error_type
;
1723 assert(operations
[this->oper
] == ir_binop_mod
);
1725 ir_rvalue
*temp_rhs
;
1726 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1730 do_assignment(instructions
, state
,
1731 this->subexpressions
[0]->non_lvalue_description
,
1732 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1733 &result
, needs_rvalue
, false,
1734 this->subexpressions
[0]->get_location());
1739 case ast_rs_assign
: {
1740 this->subexpressions
[0]->set_is_lhs(true);
1741 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1742 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1743 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1745 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1746 type
, op
[0], op
[1]);
1748 do_assignment(instructions
, state
,
1749 this->subexpressions
[0]->non_lvalue_description
,
1750 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1751 &result
, needs_rvalue
, false,
1752 this->subexpressions
[0]->get_location());
1756 case ast_and_assign
:
1757 case ast_xor_assign
:
1758 case ast_or_assign
: {
1759 this->subexpressions
[0]->set_is_lhs(true);
1760 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1761 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1763 orig_type
= op
[0]->type
;
1764 type
= bit_logic_result_type(op
[0], op
[1], this->oper
, state
, &loc
);
1766 if (type
!= orig_type
) {
1767 _mesa_glsl_error(& loc
, state
,
1768 "could not implicitly convert "
1769 "%s to %s", type
->name
, orig_type
->name
);
1770 type
= glsl_type::error_type
;
1773 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1774 type
, op
[0], op
[1]);
1776 do_assignment(instructions
, state
,
1777 this->subexpressions
[0]->non_lvalue_description
,
1778 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1779 &result
, needs_rvalue
, false,
1780 this->subexpressions
[0]->get_location());
1784 case ast_conditional
: {
1785 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1787 * "The ternary selection operator (?:). It operates on three
1788 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1789 * first expression, which must result in a scalar Boolean."
1791 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1792 "condition", &error_emitted
);
1794 /* The :? operator is implemented by generating an anonymous temporary
1795 * followed by an if-statement. The last instruction in each branch of
1796 * the if-statement assigns a value to the anonymous temporary. This
1797 * temporary is the r-value of the expression.
1799 exec_list then_instructions
;
1800 exec_list else_instructions
;
1802 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1803 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1805 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1807 * "The second and third expressions can be any type, as
1808 * long their types match, or there is a conversion in
1809 * Section 4.1.10 "Implicit Conversions" that can be applied
1810 * to one of the expressions to make their types match. This
1811 * resulting matching type is the type of the entire
1814 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1815 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1816 || (op
[1]->type
!= op
[2]->type
)) {
1817 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1819 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1820 "operator must have matching types");
1821 error_emitted
= true;
1822 type
= glsl_type::error_type
;
1827 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1829 * "The second and third expressions must be the same type, but can
1830 * be of any type other than an array."
1832 if (type
->is_array() &&
1833 !state
->check_version(120, 300, &loc
,
1834 "second and third operands of ?: operator "
1835 "cannot be arrays")) {
1836 error_emitted
= true;
1839 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1841 * "Except for array indexing, structure member selection, and
1842 * parentheses, opaque variables are not allowed to be operands in
1843 * expressions; such use results in a compile-time error."
1845 if (type
->contains_opaque()) {
1846 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1847 "of the ?: operator");
1848 error_emitted
= true;
1851 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1853 if (then_instructions
.is_empty()
1854 && else_instructions
.is_empty()
1855 && cond_val
!= NULL
) {
1856 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1858 /* The copy to conditional_tmp reads the whole array. */
1859 if (type
->is_array()) {
1860 mark_whole_array_access(op
[1]);
1861 mark_whole_array_access(op
[2]);
1864 ir_variable
*const tmp
=
1865 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1866 instructions
->push_tail(tmp
);
1868 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1869 instructions
->push_tail(stmt
);
1871 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1872 ir_dereference
*const then_deref
=
1873 new(ctx
) ir_dereference_variable(tmp
);
1874 ir_assignment
*const then_assign
=
1875 new(ctx
) ir_assignment(then_deref
, op
[1]);
1876 stmt
->then_instructions
.push_tail(then_assign
);
1878 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1879 ir_dereference
*const else_deref
=
1880 new(ctx
) ir_dereference_variable(tmp
);
1881 ir_assignment
*const else_assign
=
1882 new(ctx
) ir_assignment(else_deref
, op
[2]);
1883 stmt
->else_instructions
.push_tail(else_assign
);
1885 result
= new(ctx
) ir_dereference_variable(tmp
);
1892 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1893 ? "pre-increment operation" : "pre-decrement operation";
1895 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1896 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1898 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1900 ir_rvalue
*temp_rhs
;
1901 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1905 do_assignment(instructions
, state
,
1906 this->subexpressions
[0]->non_lvalue_description
,
1907 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1908 &result
, needs_rvalue
, false,
1909 this->subexpressions
[0]->get_location());
1914 case ast_post_dec
: {
1915 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1916 ? "post-increment operation" : "post-decrement operation";
1917 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1918 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1920 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1922 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1924 ir_rvalue
*temp_rhs
;
1925 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1928 /* Get a temporary of a copy of the lvalue before it's modified.
1929 * This may get thrown away later.
1931 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1933 ir_rvalue
*junk_rvalue
;
1935 do_assignment(instructions
, state
,
1936 this->subexpressions
[0]->non_lvalue_description
,
1937 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1938 &junk_rvalue
, false, false,
1939 this->subexpressions
[0]->get_location());
1944 case ast_field_selection
:
1945 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1948 case ast_array_index
: {
1949 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1951 /* Getting if an array is being used uninitialized is beyond what we get
1952 * from ir_value.data.assigned. Setting is_lhs as true would force to
1953 * not raise a uninitialized warning when using an array
1955 subexpressions
[0]->set_is_lhs(true);
1956 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1957 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1959 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1962 if (result
->type
->is_error())
1963 error_emitted
= true;
1968 case ast_unsized_array_dim
:
1969 assert(!"ast_unsized_array_dim: Should never get here.");
1972 case ast_function_call
:
1973 /* Should *NEVER* get here. ast_function_call should always be handled
1974 * by ast_function_expression::hir.
1979 case ast_identifier
: {
1980 /* ast_identifier can appear several places in a full abstract syntax
1981 * tree. This particular use must be at location specified in the grammar
1982 * as 'variable_identifier'.
1985 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1988 /* the identifier might be a subroutine name */
1990 sub_name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), this->primary_expression
.identifier
);
1991 var
= state
->symbols
->get_variable(sub_name
);
1992 ralloc_free(sub_name
);
1996 var
->data
.used
= true;
1997 result
= new(ctx
) ir_dereference_variable(var
);
1999 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_shader_out
)
2001 && result
->variable_referenced()->data
.assigned
!= true
2002 && !is_gl_identifier(var
->name
)) {
2003 _mesa_glsl_warning(&loc
, state
, "`%s' used uninitialized",
2004 this->primary_expression
.identifier
);
2007 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
2008 this->primary_expression
.identifier
);
2010 result
= ir_rvalue::error_value(ctx
);
2011 error_emitted
= true;
2016 case ast_int_constant
:
2017 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
2020 case ast_uint_constant
:
2021 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
2024 case ast_float_constant
:
2025 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
2028 case ast_bool_constant
:
2029 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
2032 case ast_double_constant
:
2033 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
2036 case ast_uint64_constant
:
2037 result
= new(ctx
) ir_constant(this->primary_expression
.uint64_constant
);
2040 case ast_int64_constant
:
2041 result
= new(ctx
) ir_constant(this->primary_expression
.int64_constant
);
2044 case ast_sequence
: {
2045 /* It should not be possible to generate a sequence in the AST without
2046 * any expressions in it.
2048 assert(!this->expressions
.is_empty());
2050 /* The r-value of a sequence is the last expression in the sequence. If
2051 * the other expressions in the sequence do not have side-effects (and
2052 * therefore add instructions to the instruction list), they get dropped
2055 exec_node
*previous_tail
= NULL
;
2056 YYLTYPE previous_operand_loc
= loc
;
2058 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
2059 /* If one of the operands of comma operator does not generate any
2060 * code, we want to emit a warning. At each pass through the loop
2061 * previous_tail will point to the last instruction in the stream
2062 * *before* processing the previous operand. Naturally,
2063 * instructions->get_tail_raw() will point to the last instruction in
2064 * the stream *after* processing the previous operand. If the two
2065 * pointers match, then the previous operand had no effect.
2067 * The warning behavior here differs slightly from GCC. GCC will
2068 * only emit a warning if none of the left-hand operands have an
2069 * effect. However, it will emit a warning for each. I believe that
2070 * there are some cases in C (especially with GCC extensions) where
2071 * it is useful to have an intermediate step in a sequence have no
2072 * effect, but I don't think these cases exist in GLSL. Either way,
2073 * it would be a giant hassle to replicate that behavior.
2075 if (previous_tail
== instructions
->get_tail_raw()) {
2076 _mesa_glsl_warning(&previous_operand_loc
, state
,
2077 "left-hand operand of comma expression has "
2081 /* The tail is directly accessed instead of using the get_tail()
2082 * method for performance reasons. get_tail() has extra code to
2083 * return NULL when the list is empty. We don't care about that
2084 * here, so using get_tail_raw() is fine.
2086 previous_tail
= instructions
->get_tail_raw();
2087 previous_operand_loc
= ast
->get_location();
2089 result
= ast
->hir(instructions
, state
);
2092 /* Any errors should have already been emitted in the loop above.
2094 error_emitted
= true;
2098 type
= NULL
; /* use result->type, not type. */
2099 assert(result
!= NULL
|| !needs_rvalue
);
2101 if (result
&& result
->type
->is_error() && !error_emitted
)
2102 _mesa_glsl_error(& loc
, state
, "type mismatch");
2108 ast_expression::has_sequence_subexpression() const
2110 switch (this->oper
) {
2119 return this->subexpressions
[0]->has_sequence_subexpression();
2141 case ast_array_index
:
2142 case ast_mul_assign
:
2143 case ast_div_assign
:
2144 case ast_add_assign
:
2145 case ast_sub_assign
:
2146 case ast_mod_assign
:
2149 case ast_and_assign
:
2150 case ast_xor_assign
:
2152 return this->subexpressions
[0]->has_sequence_subexpression() ||
2153 this->subexpressions
[1]->has_sequence_subexpression();
2155 case ast_conditional
:
2156 return this->subexpressions
[0]->has_sequence_subexpression() ||
2157 this->subexpressions
[1]->has_sequence_subexpression() ||
2158 this->subexpressions
[2]->has_sequence_subexpression();
2163 case ast_field_selection
:
2164 case ast_identifier
:
2165 case ast_int_constant
:
2166 case ast_uint_constant
:
2167 case ast_float_constant
:
2168 case ast_bool_constant
:
2169 case ast_double_constant
:
2170 case ast_int64_constant
:
2171 case ast_uint64_constant
:
2177 case ast_function_call
:
2178 unreachable("should be handled by ast_function_expression::hir");
2180 case ast_unsized_array_dim
:
2181 unreachable("ast_unsized_array_dim: Should never get here.");
2188 ast_expression_statement::hir(exec_list
*instructions
,
2189 struct _mesa_glsl_parse_state
*state
)
2191 /* It is possible to have expression statements that don't have an
2192 * expression. This is the solitary semicolon:
2194 * for (i = 0; i < 5; i++)
2197 * In this case the expression will be NULL. Test for NULL and don't do
2198 * anything in that case.
2200 if (expression
!= NULL
)
2201 expression
->hir_no_rvalue(instructions
, state
);
2203 /* Statements do not have r-values.
2210 ast_compound_statement::hir(exec_list
*instructions
,
2211 struct _mesa_glsl_parse_state
*state
)
2214 state
->symbols
->push_scope();
2216 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
2217 ast
->hir(instructions
, state
);
2220 state
->symbols
->pop_scope();
2222 /* Compound statements do not have r-values.
2228 * Evaluate the given exec_node (which should be an ast_node representing
2229 * a single array dimension) and return its integer value.
2232 process_array_size(exec_node
*node
,
2233 struct _mesa_glsl_parse_state
*state
)
2235 exec_list dummy_instructions
;
2237 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
2240 * Dimensions other than the outermost dimension can by unsized if they
2241 * are immediately sized by a constructor or initializer.
2243 if (((ast_expression
*)array_size
)->oper
== ast_unsized_array_dim
)
2246 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
2247 YYLTYPE loc
= array_size
->get_location();
2250 _mesa_glsl_error(& loc
, state
,
2251 "array size could not be resolved");
2255 if (!ir
->type
->is_integer()) {
2256 _mesa_glsl_error(& loc
, state
,
2257 "array size must be integer type");
2261 if (!ir
->type
->is_scalar()) {
2262 _mesa_glsl_error(& loc
, state
,
2263 "array size must be scalar type");
2267 ir_constant
*const size
= ir
->constant_expression_value();
2269 (state
->is_version(120, 300) &&
2270 array_size
->has_sequence_subexpression())) {
2271 _mesa_glsl_error(& loc
, state
, "array size must be a "
2272 "constant valued expression");
2276 if (size
->value
.i
[0] <= 0) {
2277 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
2281 assert(size
->type
== ir
->type
);
2283 /* If the array size is const (and we've verified that
2284 * it is) then no instructions should have been emitted
2285 * when we converted it to HIR. If they were emitted,
2286 * then either the array size isn't const after all, or
2287 * we are emitting unnecessary instructions.
2289 assert(dummy_instructions
.is_empty());
2291 return size
->value
.u
[0];
2294 static const glsl_type
*
2295 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
2296 ast_array_specifier
*array_specifier
,
2297 struct _mesa_glsl_parse_state
*state
)
2299 const glsl_type
*array_type
= base
;
2301 if (array_specifier
!= NULL
) {
2302 if (base
->is_array()) {
2304 /* From page 19 (page 25) of the GLSL 1.20 spec:
2306 * "Only one-dimensional arrays may be declared."
2308 if (!state
->check_arrays_of_arrays_allowed(loc
)) {
2309 return glsl_type::error_type
;
2313 for (exec_node
*node
= array_specifier
->array_dimensions
.get_tail_raw();
2314 !node
->is_head_sentinel(); node
= node
->prev
) {
2315 unsigned array_size
= process_array_size(node
, state
);
2316 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
2324 precision_qualifier_allowed(const glsl_type
*type
)
2326 /* Precision qualifiers apply to floating point, integer and opaque
2329 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
2330 * "Any floating point or any integer declaration can have the type
2331 * preceded by one of these precision qualifiers [...] Literal
2332 * constants do not have precision qualifiers. Neither do Boolean
2335 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
2338 * "Precision qualifiers are added for code portability with OpenGL
2339 * ES, not for functionality. They have the same syntax as in OpenGL
2342 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
2344 * "uniform lowp sampler2D sampler;
2347 * lowp vec4 col = texture2D (sampler, coord);
2348 * // texture2D returns lowp"
2350 * From this, we infer that GLSL 1.30 (and later) should allow precision
2351 * qualifiers on sampler types just like float and integer types.
2353 const glsl_type
*const t
= type
->without_array();
2355 return (t
->is_float() || t
->is_integer() || t
->contains_opaque()) &&
2360 ast_type_specifier::glsl_type(const char **name
,
2361 struct _mesa_glsl_parse_state
*state
) const
2363 const struct glsl_type
*type
;
2365 type
= state
->symbols
->get_type(this->type_name
);
2366 *name
= this->type_name
;
2368 YYLTYPE loc
= this->get_location();
2369 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2375 * From the OpenGL ES 3.0 spec, 4.5.4 Default Precision Qualifiers:
2377 * "The precision statement
2379 * precision precision-qualifier type;
2381 * can be used to establish a default precision qualifier. The type field can
2382 * be either int or float or any of the sampler types, (...) If type is float,
2383 * the directive applies to non-precision-qualified floating point type
2384 * (scalar, vector, and matrix) declarations. If type is int, the directive
2385 * applies to all non-precision-qualified integer type (scalar, vector, signed,
2386 * and unsigned) declarations."
2388 * We use the symbol table to keep the values of the default precisions for
2389 * each 'type' in each scope and we use the 'type' string from the precision
2390 * statement as key in the symbol table. When we want to retrieve the default
2391 * precision associated with a given glsl_type we need to know the type string
2392 * associated with it. This is what this function returns.
2395 get_type_name_for_precision_qualifier(const glsl_type
*type
)
2397 switch (type
->base_type
) {
2398 case GLSL_TYPE_FLOAT
:
2400 case GLSL_TYPE_UINT
:
2403 case GLSL_TYPE_ATOMIC_UINT
:
2404 return "atomic_uint";
2405 case GLSL_TYPE_IMAGE
:
2407 case GLSL_TYPE_SAMPLER
: {
2408 const unsigned type_idx
=
2409 type
->sampler_array
+ 2 * type
->sampler_shadow
;
2410 const unsigned offset
= type
->base_type
== GLSL_TYPE_SAMPLER
? 0 : 4;
2411 assert(type_idx
< 4);
2412 switch (type
->sampled_type
) {
2413 case GLSL_TYPE_FLOAT
:
2414 switch (type
->sampler_dimensionality
) {
2415 case GLSL_SAMPLER_DIM_1D
: {
2416 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2417 static const char *const names
[4] = {
2418 "sampler1D", "sampler1DArray",
2419 "sampler1DShadow", "sampler1DArrayShadow"
2421 return names
[type_idx
];
2423 case GLSL_SAMPLER_DIM_2D
: {
2424 static const char *const names
[8] = {
2425 "sampler2D", "sampler2DArray",
2426 "sampler2DShadow", "sampler2DArrayShadow",
2427 "image2D", "image2DArray", NULL
, NULL
2429 return names
[offset
+ type_idx
];
2431 case GLSL_SAMPLER_DIM_3D
: {
2432 static const char *const names
[8] = {
2433 "sampler3D", NULL
, NULL
, NULL
,
2434 "image3D", NULL
, NULL
, NULL
2436 return names
[offset
+ type_idx
];
2438 case GLSL_SAMPLER_DIM_CUBE
: {
2439 static const char *const names
[8] = {
2440 "samplerCube", "samplerCubeArray",
2441 "samplerCubeShadow", "samplerCubeArrayShadow",
2442 "imageCube", NULL
, NULL
, NULL
2444 return names
[offset
+ type_idx
];
2446 case GLSL_SAMPLER_DIM_MS
: {
2447 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2448 static const char *const names
[4] = {
2449 "sampler2DMS", "sampler2DMSArray", NULL
, NULL
2451 return names
[type_idx
];
2453 case GLSL_SAMPLER_DIM_RECT
: {
2454 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2455 static const char *const names
[4] = {
2456 "samplerRect", NULL
, "samplerRectShadow", NULL
2458 return names
[type_idx
];
2460 case GLSL_SAMPLER_DIM_BUF
: {
2461 static const char *const names
[8] = {
2462 "samplerBuffer", NULL
, NULL
, NULL
,
2463 "imageBuffer", NULL
, NULL
, NULL
2465 return names
[offset
+ type_idx
];
2467 case GLSL_SAMPLER_DIM_EXTERNAL
: {
2468 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2469 static const char *const names
[4] = {
2470 "samplerExternalOES", NULL
, NULL
, NULL
2472 return names
[type_idx
];
2475 unreachable("Unsupported sampler/image dimensionality");
2476 } /* sampler/image float dimensionality */
2479 switch (type
->sampler_dimensionality
) {
2480 case GLSL_SAMPLER_DIM_1D
: {
2481 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2482 static const char *const names
[4] = {
2483 "isampler1D", "isampler1DArray", NULL
, NULL
2485 return names
[type_idx
];
2487 case GLSL_SAMPLER_DIM_2D
: {
2488 static const char *const names
[8] = {
2489 "isampler2D", "isampler2DArray", NULL
, NULL
,
2490 "iimage2D", "iimage2DArray", NULL
, NULL
2492 return names
[offset
+ type_idx
];
2494 case GLSL_SAMPLER_DIM_3D
: {
2495 static const char *const names
[8] = {
2496 "isampler3D", NULL
, NULL
, NULL
,
2497 "iimage3D", NULL
, NULL
, NULL
2499 return names
[offset
+ type_idx
];
2501 case GLSL_SAMPLER_DIM_CUBE
: {
2502 static const char *const names
[8] = {
2503 "isamplerCube", "isamplerCubeArray", NULL
, NULL
,
2504 "iimageCube", NULL
, NULL
, NULL
2506 return names
[offset
+ type_idx
];
2508 case GLSL_SAMPLER_DIM_MS
: {
2509 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2510 static const char *const names
[4] = {
2511 "isampler2DMS", "isampler2DMSArray", NULL
, NULL
2513 return names
[type_idx
];
2515 case GLSL_SAMPLER_DIM_RECT
: {
2516 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2517 static const char *const names
[4] = {
2518 "isamplerRect", NULL
, "isamplerRectShadow", NULL
2520 return names
[type_idx
];
2522 case GLSL_SAMPLER_DIM_BUF
: {
2523 static const char *const names
[8] = {
2524 "isamplerBuffer", NULL
, NULL
, NULL
,
2525 "iimageBuffer", NULL
, NULL
, NULL
2527 return names
[offset
+ type_idx
];
2530 unreachable("Unsupported isampler/iimage dimensionality");
2531 } /* sampler/image int dimensionality */
2533 case GLSL_TYPE_UINT
:
2534 switch (type
->sampler_dimensionality
) {
2535 case GLSL_SAMPLER_DIM_1D
: {
2536 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2537 static const char *const names
[4] = {
2538 "usampler1D", "usampler1DArray", NULL
, NULL
2540 return names
[type_idx
];
2542 case GLSL_SAMPLER_DIM_2D
: {
2543 static const char *const names
[8] = {
2544 "usampler2D", "usampler2DArray", NULL
, NULL
,
2545 "uimage2D", "uimage2DArray", NULL
, NULL
2547 return names
[offset
+ type_idx
];
2549 case GLSL_SAMPLER_DIM_3D
: {
2550 static const char *const names
[8] = {
2551 "usampler3D", NULL
, NULL
, NULL
,
2552 "uimage3D", NULL
, NULL
, NULL
2554 return names
[offset
+ type_idx
];
2556 case GLSL_SAMPLER_DIM_CUBE
: {
2557 static const char *const names
[8] = {
2558 "usamplerCube", "usamplerCubeArray", NULL
, NULL
,
2559 "uimageCube", NULL
, NULL
, NULL
2561 return names
[offset
+ type_idx
];
2563 case GLSL_SAMPLER_DIM_MS
: {
2564 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2565 static const char *const names
[4] = {
2566 "usampler2DMS", "usampler2DMSArray", NULL
, NULL
2568 return names
[type_idx
];
2570 case GLSL_SAMPLER_DIM_RECT
: {
2571 assert(type
->base_type
== GLSL_TYPE_SAMPLER
);
2572 static const char *const names
[4] = {
2573 "usamplerRect", NULL
, "usamplerRectShadow", NULL
2575 return names
[type_idx
];
2577 case GLSL_SAMPLER_DIM_BUF
: {
2578 static const char *const names
[8] = {
2579 "usamplerBuffer", NULL
, NULL
, NULL
,
2580 "uimageBuffer", NULL
, NULL
, NULL
2582 return names
[offset
+ type_idx
];
2585 unreachable("Unsupported usampler/uimage dimensionality");
2586 } /* sampler/image uint dimensionality */
2589 unreachable("Unsupported sampler/image type");
2590 } /* sampler/image type */
2592 } /* GLSL_TYPE_SAMPLER/GLSL_TYPE_IMAGE */
2595 unreachable("Unsupported type");
2600 select_gles_precision(unsigned qual_precision
,
2601 const glsl_type
*type
,
2602 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
2604 /* Precision qualifiers do not have any meaning in Desktop GLSL.
2605 * In GLES we take the precision from the type qualifier if present,
2606 * otherwise, if the type of the variable allows precision qualifiers at
2607 * all, we look for the default precision qualifier for that type in the
2610 assert(state
->es_shader
);
2612 unsigned precision
= GLSL_PRECISION_NONE
;
2613 if (qual_precision
) {
2614 precision
= qual_precision
;
2615 } else if (precision_qualifier_allowed(type
)) {
2616 const char *type_name
=
2617 get_type_name_for_precision_qualifier(type
->without_array());
2618 assert(type_name
!= NULL
);
2621 state
->symbols
->get_default_precision_qualifier(type_name
);
2622 if (precision
== ast_precision_none
) {
2623 _mesa_glsl_error(loc
, state
,
2624 "No precision specified in this scope for type `%s'",
2630 /* Section 4.1.7.3 (Atomic Counters) of the GLSL ES 3.10 spec says:
2632 * "The default precision of all atomic types is highp. It is an error to
2633 * declare an atomic type with a different precision or to specify the
2634 * default precision for an atomic type to be lowp or mediump."
2636 if (type
->base_type
== GLSL_TYPE_ATOMIC_UINT
&&
2637 precision
!= ast_precision_high
) {
2638 _mesa_glsl_error(loc
, state
,
2639 "atomic_uint can only have highp precision qualifier");
2646 ast_fully_specified_type::glsl_type(const char **name
,
2647 struct _mesa_glsl_parse_state
*state
) const
2649 return this->specifier
->glsl_type(name
, state
);
2653 * Determine whether a toplevel variable declaration declares a varying. This
2654 * function operates by examining the variable's mode and the shader target,
2655 * so it correctly identifies linkage variables regardless of whether they are
2656 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2658 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2659 * this function will produce undefined results.
2662 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2665 case MESA_SHADER_VERTEX
:
2666 return var
->data
.mode
== ir_var_shader_out
;
2667 case MESA_SHADER_FRAGMENT
:
2668 return var
->data
.mode
== ir_var_shader_in
;
2670 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2675 is_allowed_invariant(ir_variable
*var
, struct _mesa_glsl_parse_state
*state
)
2677 if (is_varying_var(var
, state
->stage
))
2680 /* From Section 4.6.1 ("The Invariant Qualifier") GLSL 1.20 spec:
2681 * "Only variables output from a vertex shader can be candidates
2684 if (!state
->is_version(130, 0))
2688 * Later specs remove this language - so allowed invariant
2689 * on fragment shader outputs as well.
2691 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
2692 var
->data
.mode
== ir_var_shader_out
)
2698 * Matrix layout qualifiers are only allowed on certain types
2701 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2703 const glsl_type
*type
,
2706 if (var
&& !var
->is_in_buffer_block()) {
2707 /* Layout qualifiers may only apply to interface blocks and fields in
2710 _mesa_glsl_error(loc
, state
,
2711 "uniform block layout qualifiers row_major and "
2712 "column_major may not be applied to variables "
2713 "outside of uniform blocks");
2714 } else if (!type
->without_array()->is_matrix()) {
2715 /* The OpenGL ES 3.0 conformance tests did not originally allow
2716 * matrix layout qualifiers on non-matrices. However, the OpenGL
2717 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2718 * amended to specifically allow these layouts on all types. Emit
2719 * a warning so that people know their code may not be portable.
2721 _mesa_glsl_warning(loc
, state
,
2722 "uniform block layout qualifiers row_major and "
2723 "column_major applied to non-matrix types may "
2724 "be rejected by older compilers");
2729 validate_xfb_buffer_qualifier(YYLTYPE
*loc
,
2730 struct _mesa_glsl_parse_state
*state
,
2731 unsigned xfb_buffer
) {
2732 if (xfb_buffer
>= state
->Const
.MaxTransformFeedbackBuffers
) {
2733 _mesa_glsl_error(loc
, state
,
2734 "invalid xfb_buffer specified %d is larger than "
2735 "MAX_TRANSFORM_FEEDBACK_BUFFERS - 1 (%d).",
2737 state
->Const
.MaxTransformFeedbackBuffers
- 1);
2744 /* From the ARB_enhanced_layouts spec:
2746 * "Variables and block members qualified with *xfb_offset* can be
2747 * scalars, vectors, matrices, structures, and (sized) arrays of these.
2748 * The offset must be a multiple of the size of the first component of
2749 * the first qualified variable or block member, or a compile-time error
2750 * results. Further, if applied to an aggregate containing a double,
2751 * the offset must also be a multiple of 8, and the space taken in the
2752 * buffer will be a multiple of 8.
2755 validate_xfb_offset_qualifier(YYLTYPE
*loc
,
2756 struct _mesa_glsl_parse_state
*state
,
2757 int xfb_offset
, const glsl_type
*type
,
2758 unsigned component_size
) {
2759 const glsl_type
*t_without_array
= type
->without_array();
2761 if (xfb_offset
!= -1 && type
->is_unsized_array()) {
2762 _mesa_glsl_error(loc
, state
,
2763 "xfb_offset can't be used with unsized arrays.");
2767 /* Make sure nested structs don't contain unsized arrays, and validate
2768 * any xfb_offsets on interface members.
2770 if (t_without_array
->is_record() || t_without_array
->is_interface())
2771 for (unsigned int i
= 0; i
< t_without_array
->length
; i
++) {
2772 const glsl_type
*member_t
= t_without_array
->fields
.structure
[i
].type
;
2774 /* When the interface block doesn't have an xfb_offset qualifier then
2775 * we apply the component size rules at the member level.
2777 if (xfb_offset
== -1)
2778 component_size
= member_t
->contains_double() ? 8 : 4;
2780 int xfb_offset
= t_without_array
->fields
.structure
[i
].offset
;
2781 validate_xfb_offset_qualifier(loc
, state
, xfb_offset
, member_t
,
2785 /* Nested structs or interface block without offset may not have had an
2786 * offset applied yet so return.
2788 if (xfb_offset
== -1) {
2792 if (xfb_offset
% component_size
) {
2793 _mesa_glsl_error(loc
, state
,
2794 "invalid qualifier xfb_offset=%d must be a multiple "
2795 "of the first component size of the first qualified "
2796 "variable or block member. Or double if an aggregate "
2797 "that contains a double (%d).",
2798 xfb_offset
, component_size
);
2806 validate_stream_qualifier(YYLTYPE
*loc
, struct _mesa_glsl_parse_state
*state
,
2809 if (stream
>= state
->ctx
->Const
.MaxVertexStreams
) {
2810 _mesa_glsl_error(loc
, state
,
2811 "invalid stream specified %d is larger than "
2812 "MAX_VERTEX_STREAMS - 1 (%d).",
2813 stream
, state
->ctx
->Const
.MaxVertexStreams
- 1);
2821 apply_explicit_binding(struct _mesa_glsl_parse_state
*state
,
2824 const glsl_type
*type
,
2825 const ast_type_qualifier
*qual
)
2827 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2828 _mesa_glsl_error(loc
, state
,
2829 "the \"binding\" qualifier only applies to uniforms and "
2830 "shader storage buffer objects");
2834 unsigned qual_binding
;
2835 if (!process_qualifier_constant(state
, loc
, "binding", qual
->binding
,
2840 const struct gl_context
*const ctx
= state
->ctx
;
2841 unsigned elements
= type
->is_array() ? type
->arrays_of_arrays_size() : 1;
2842 unsigned max_index
= qual_binding
+ elements
- 1;
2843 const glsl_type
*base_type
= type
->without_array();
2845 if (base_type
->is_interface()) {
2846 /* UBOs. From page 60 of the GLSL 4.20 specification:
2847 * "If the binding point for any uniform block instance is less than zero,
2848 * or greater than or equal to the implementation-dependent maximum
2849 * number of uniform buffer bindings, a compilation error will occur.
2850 * When the binding identifier is used with a uniform block instanced as
2851 * an array of size N, all elements of the array from binding through
2852 * binding + N – 1 must be within this range."
2854 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2856 if (qual
->flags
.q
.uniform
&&
2857 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2858 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d UBOs exceeds "
2859 "the maximum number of UBO binding points (%d)",
2860 qual_binding
, elements
,
2861 ctx
->Const
.MaxUniformBufferBindings
);
2865 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2866 * "If the binding point for any uniform or shader storage block instance
2867 * is less than zero, or greater than or equal to the
2868 * implementation-dependent maximum number of uniform buffer bindings, a
2869 * compile-time error will occur. When the binding identifier is used
2870 * with a uniform or shader storage block instanced as an array of size
2871 * N, all elements of the array from binding through binding + N – 1 must
2872 * be within this range."
2874 if (qual
->flags
.q
.buffer
&&
2875 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2876 _mesa_glsl_error(loc
, state
, "layout(binding = %u) for %d SSBOs exceeds "
2877 "the maximum number of SSBO binding points (%d)",
2878 qual_binding
, elements
,
2879 ctx
->Const
.MaxShaderStorageBufferBindings
);
2882 } else if (base_type
->is_sampler()) {
2883 /* Samplers. From page 63 of the GLSL 4.20 specification:
2884 * "If the binding is less than zero, or greater than or equal to the
2885 * implementation-dependent maximum supported number of units, a
2886 * compilation error will occur. When the binding identifier is used
2887 * with an array of size N, all elements of the array from binding
2888 * through binding + N - 1 must be within this range."
2890 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2892 if (max_index
>= limit
) {
2893 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2894 "exceeds the maximum number of texture image units "
2895 "(%u)", qual_binding
, elements
, limit
);
2899 } else if (base_type
->contains_atomic()) {
2900 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2901 if (qual_binding
>= ctx
->Const
.MaxAtomicBufferBindings
) {
2902 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2903 " maximum number of atomic counter buffer bindings"
2904 "(%u)", qual_binding
,
2905 ctx
->Const
.MaxAtomicBufferBindings
);
2909 } else if ((state
->is_version(420, 310) ||
2910 state
->ARB_shading_language_420pack_enable
) &&
2911 base_type
->is_image()) {
2912 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2913 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2914 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2915 " maximum number of image units (%d)", max_index
,
2916 ctx
->Const
.MaxImageUnits
);
2921 _mesa_glsl_error(loc
, state
,
2922 "the \"binding\" qualifier only applies to uniform "
2923 "blocks, opaque variables, or arrays thereof");
2927 var
->data
.explicit_binding
= true;
2928 var
->data
.binding
= qual_binding
;
2935 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
2937 const glsl_interp_mode interpolation
,
2938 const struct ast_type_qualifier
*qual
,
2939 const struct glsl_type
*var_type
,
2940 ir_variable_mode mode
)
2942 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
2943 * not to vertex shader inputs nor fragment shader outputs.
2945 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2946 * "Outputs from a vertex shader (out) and inputs to a fragment
2947 * shader (in) can be further qualified with one or more of these
2948 * interpolation qualifiers"
2950 * "These interpolation qualifiers may only precede the qualifiers in,
2951 * centroid in, out, or centroid out in a declaration. They do not apply
2952 * to the deprecated storage qualifiers varying or centroid
2953 * varying. They also do not apply to inputs into a vertex shader or
2954 * outputs from a fragment shader."
2956 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
2957 * "Outputs from a shader (out) and inputs to a shader (in) can be
2958 * further qualified with one of these interpolation qualifiers."
2960 * "These interpolation qualifiers may only precede the qualifiers
2961 * in, centroid in, out, or centroid out in a declaration. They do
2962 * not apply to inputs into a vertex shader or outputs from a
2965 if (state
->is_version(130, 300)
2966 && interpolation
!= INTERP_MODE_NONE
) {
2967 const char *i
= interpolation_string(interpolation
);
2968 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
2969 _mesa_glsl_error(loc
, state
,
2970 "interpolation qualifier `%s' can only be applied to "
2971 "shader inputs or outputs.", i
);
2973 switch (state
->stage
) {
2974 case MESA_SHADER_VERTEX
:
2975 if (mode
== ir_var_shader_in
) {
2976 _mesa_glsl_error(loc
, state
,
2977 "interpolation qualifier '%s' cannot be applied to "
2978 "vertex shader inputs", i
);
2981 case MESA_SHADER_FRAGMENT
:
2982 if (mode
== ir_var_shader_out
) {
2983 _mesa_glsl_error(loc
, state
,
2984 "interpolation qualifier '%s' cannot be applied to "
2985 "fragment shader outputs", i
);
2993 /* Interpolation qualifiers cannot be applied to 'centroid' and
2994 * 'centroid varying'.
2996 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
2997 * "interpolation qualifiers may only precede the qualifiers in,
2998 * centroid in, out, or centroid out in a declaration. They do not apply
2999 * to the deprecated storage qualifiers varying or centroid varying."
3001 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3003 if (state
->is_version(130, 0)
3004 && interpolation
!= INTERP_MODE_NONE
3005 && qual
->flags
.q
.varying
) {
3007 const char *i
= interpolation_string(interpolation
);
3009 if (qual
->flags
.q
.centroid
)
3010 s
= "centroid varying";
3014 _mesa_glsl_error(loc
, state
,
3015 "qualifier '%s' cannot be applied to the "
3016 "deprecated storage qualifier '%s'", i
, s
);
3019 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
3020 * so must integer vertex outputs.
3022 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
3023 * "Fragment shader inputs that are signed or unsigned integers or
3024 * integer vectors must be qualified with the interpolation qualifier
3027 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
3028 * "Fragment shader inputs that are, or contain, signed or unsigned
3029 * integers or integer vectors must be qualified with the
3030 * interpolation qualifier flat."
3032 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
3033 * "Vertex shader outputs that are, or contain, signed or unsigned
3034 * integers or integer vectors must be qualified with the
3035 * interpolation qualifier flat."
3037 * Note that prior to GLSL 1.50, this requirement applied to vertex
3038 * outputs rather than fragment inputs. That creates problems in the
3039 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
3040 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
3041 * apply the restriction to both vertex outputs and fragment inputs.
3043 * Note also that the desktop GLSL specs are missing the text "or
3044 * contain"; this is presumably an oversight, since there is no
3045 * reasonable way to interpolate a fragment shader input that contains
3046 * an integer. See Khronos bug #15671.
3048 if (state
->is_version(130, 300)
3049 && var_type
->contains_integer()
3050 && interpolation
!= INTERP_MODE_FLAT
3051 && state
->stage
== MESA_SHADER_FRAGMENT
3052 && mode
== ir_var_shader_in
) {
3053 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3054 "an integer, then it must be qualified with 'flat'");
3057 /* Double fragment inputs must be qualified with 'flat'.
3059 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
3060 * "This extension does not support interpolation of double-precision
3061 * values; doubles used as fragment shader inputs must be qualified as
3064 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
3065 * "Fragment shader inputs that are signed or unsigned integers, integer
3066 * vectors, or any double-precision floating-point type must be
3067 * qualified with the interpolation qualifier flat."
3069 * Note that the GLSL specs are missing the text "or contain"; this is
3070 * presumably an oversight. See Khronos bug #15671.
3072 * The 'double' type does not exist in GLSL ES so far.
3074 if (state
->has_double()
3075 && var_type
->contains_double()
3076 && interpolation
!= INTERP_MODE_FLAT
3077 && state
->stage
== MESA_SHADER_FRAGMENT
3078 && mode
== ir_var_shader_in
) {
3079 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3080 "a double, then it must be qualified with 'flat'");
3084 static glsl_interp_mode
3085 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3086 const struct glsl_type
*var_type
,
3087 ir_variable_mode mode
,
3088 struct _mesa_glsl_parse_state
*state
,
3091 glsl_interp_mode interpolation
;
3092 if (qual
->flags
.q
.flat
)
3093 interpolation
= INTERP_MODE_FLAT
;
3094 else if (qual
->flags
.q
.noperspective
)
3095 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3096 else if (qual
->flags
.q
.smooth
)
3097 interpolation
= INTERP_MODE_SMOOTH
;
3098 else if (state
->es_shader
&&
3099 ((mode
== ir_var_shader_in
&&
3100 state
->stage
!= MESA_SHADER_VERTEX
) ||
3101 (mode
== ir_var_shader_out
&&
3102 state
->stage
!= MESA_SHADER_FRAGMENT
)))
3103 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
3105 * "When no interpolation qualifier is present, smooth interpolation
3108 interpolation
= INTERP_MODE_SMOOTH
;
3110 interpolation
= INTERP_MODE_NONE
;
3112 validate_interpolation_qualifier(state
, loc
,
3114 qual
, var_type
, mode
);
3116 return interpolation
;
3121 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3123 struct _mesa_glsl_parse_state
*state
,
3128 unsigned qual_location
;
3129 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3134 /* Checks for GL_ARB_explicit_uniform_location. */
3135 if (qual
->flags
.q
.uniform
) {
3136 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3139 const struct gl_context
*const ctx
= state
->ctx
;
3140 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3142 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3143 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3144 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3145 ctx
->Const
.MaxUserAssignableUniformLocations
);
3149 var
->data
.explicit_location
= true;
3150 var
->data
.location
= qual_location
;
3154 /* Between GL_ARB_explicit_attrib_location an
3155 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3156 * stage can be assigned explicit locations. The checking here associates
3157 * the correct extension with the correct stage's input / output:
3161 * vertex explicit_loc sso
3162 * tess control sso sso
3165 * fragment sso explicit_loc
3167 switch (state
->stage
) {
3168 case MESA_SHADER_VERTEX
:
3169 if (var
->data
.mode
== ir_var_shader_in
) {
3170 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3176 if (var
->data
.mode
== ir_var_shader_out
) {
3177 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3186 case MESA_SHADER_TESS_CTRL
:
3187 case MESA_SHADER_TESS_EVAL
:
3188 case MESA_SHADER_GEOMETRY
:
3189 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3190 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3199 case MESA_SHADER_FRAGMENT
:
3200 if (var
->data
.mode
== ir_var_shader_in
) {
3201 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3207 if (var
->data
.mode
== ir_var_shader_out
) {
3208 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3217 case MESA_SHADER_COMPUTE
:
3218 _mesa_glsl_error(loc
, state
,
3219 "compute shader variables cannot be given "
3220 "explicit locations");
3225 _mesa_glsl_error(loc
, state
,
3226 "%s cannot be given an explicit location in %s shader",
3228 _mesa_shader_stage_to_string(state
->stage
));
3230 var
->data
.explicit_location
= true;
3232 switch (state
->stage
) {
3233 case MESA_SHADER_VERTEX
:
3234 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3235 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3236 : (qual_location
+ VARYING_SLOT_VAR0
);
3239 case MESA_SHADER_TESS_CTRL
:
3240 case MESA_SHADER_TESS_EVAL
:
3241 case MESA_SHADER_GEOMETRY
:
3242 if (var
->data
.patch
)
3243 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3245 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3248 case MESA_SHADER_FRAGMENT
:
3249 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3250 ? (qual_location
+ FRAG_RESULT_DATA0
)
3251 : (qual_location
+ VARYING_SLOT_VAR0
);
3253 case MESA_SHADER_COMPUTE
:
3254 assert(!"Unexpected shader type");
3258 /* Check if index was set for the uniform instead of the function */
3259 if (qual
->flags
.q
.explicit_index
&& qual
->flags
.q
.subroutine
) {
3260 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3261 "used with subroutine functions");
3265 unsigned qual_index
;
3266 if (qual
->flags
.q
.explicit_index
&&
3267 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3269 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3270 * Layout Qualifiers):
3272 * "It is also a compile-time error if a fragment shader
3273 * sets a layout index to less than 0 or greater than 1."
3275 * Older specifications don't mandate a behavior; we take
3276 * this as a clarification and always generate the error.
3278 if (qual_index
> 1) {
3279 _mesa_glsl_error(loc
, state
,
3280 "explicit index may only be 0 or 1");
3282 var
->data
.explicit_index
= true;
3283 var
->data
.index
= qual_index
;
3290 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3292 struct _mesa_glsl_parse_state
*state
,
3295 const glsl_type
*base_type
= var
->type
->without_array();
3297 if (base_type
->is_image()) {
3298 if (var
->data
.mode
!= ir_var_uniform
&&
3299 var
->data
.mode
!= ir_var_function_in
) {
3300 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
3301 "function parameters or uniform-qualified "
3302 "global variables");
3305 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
3306 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
3307 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
3308 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
3309 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
3310 var
->data
.read_only
= true;
3312 if (qual
->flags
.q
.explicit_image_format
) {
3313 if (var
->data
.mode
== ir_var_function_in
) {
3314 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
3315 "used on image function parameters");
3318 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3319 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
3320 "base data type of the image");
3323 var
->data
.image_format
= qual
->image_format
;
3325 if (var
->data
.mode
== ir_var_uniform
) {
3326 if (state
->es_shader
) {
3327 _mesa_glsl_error(loc
, state
, "all image uniforms "
3328 "must have a format layout qualifier");
3330 } else if (!qual
->flags
.q
.write_only
) {
3331 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3332 "`writeonly' must have a format layout "
3337 var
->data
.image_format
= GL_NONE
;
3340 /* From page 70 of the GLSL ES 3.1 specification:
3342 * "Except for image variables qualified with the format qualifiers
3343 * r32f, r32i, and r32ui, image variables must specify either memory
3344 * qualifier readonly or the memory qualifier writeonly."
3346 if (state
->es_shader
&&
3347 var
->data
.image_format
!= GL_R32F
&&
3348 var
->data
.image_format
!= GL_R32I
&&
3349 var
->data
.image_format
!= GL_R32UI
&&
3350 !var
->data
.image_read_only
&&
3351 !var
->data
.image_write_only
) {
3352 _mesa_glsl_error(loc
, state
, "image variables of format other than "
3353 "r32f, r32i or r32ui must be qualified `readonly' or "
3357 } else if (qual
->flags
.q
.read_only
||
3358 qual
->flags
.q
.write_only
||
3359 qual
->flags
.q
.coherent
||
3360 qual
->flags
.q
._volatile
||
3361 qual
->flags
.q
.restrict_flag
||
3362 qual
->flags
.q
.explicit_image_format
) {
3363 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
3368 static inline const char*
3369 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3371 if (origin_upper_left
&& pixel_center_integer
)
3372 return "origin_upper_left, pixel_center_integer";
3373 else if (origin_upper_left
)
3374 return "origin_upper_left";
3375 else if (pixel_center_integer
)
3376 return "pixel_center_integer";
3382 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3383 const struct ast_type_qualifier
*qual
)
3385 /* If gl_FragCoord was previously declared, and the qualifiers were
3386 * different in any way, return true.
3388 if (state
->fs_redeclares_gl_fragcoord
) {
3389 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3390 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3397 validate_array_dimensions(const glsl_type
*t
,
3398 struct _mesa_glsl_parse_state
*state
,
3400 if (t
->is_array()) {
3401 t
= t
->fields
.array
;
3402 while (t
->is_array()) {
3403 if (t
->is_unsized_array()) {
3404 _mesa_glsl_error(loc
, state
,
3405 "only the outermost array dimension can "
3410 t
= t
->fields
.array
;
3416 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3418 struct _mesa_glsl_parse_state
*state
,
3421 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3423 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3425 * "Within any shader, the first redeclarations of gl_FragCoord
3426 * must appear before any use of gl_FragCoord."
3428 * Generate a compiler error if above condition is not met by the
3431 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3432 if (earlier
!= NULL
&&
3433 earlier
->data
.used
&&
3434 !state
->fs_redeclares_gl_fragcoord
) {
3435 _mesa_glsl_error(loc
, state
,
3436 "gl_FragCoord used before its first redeclaration "
3437 "in fragment shader");
3440 /* Make sure all gl_FragCoord redeclarations specify the same layout
3443 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3444 const char *const qual_string
=
3445 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3446 qual
->flags
.q
.pixel_center_integer
);
3448 const char *const state_string
=
3449 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3450 state
->fs_pixel_center_integer
);
3452 _mesa_glsl_error(loc
, state
,
3453 "gl_FragCoord redeclared with different layout "
3454 "qualifiers (%s) and (%s) ",
3458 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3459 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3460 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3461 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3462 state
->fs_redeclares_gl_fragcoord
=
3463 state
->fs_origin_upper_left
||
3464 state
->fs_pixel_center_integer
||
3465 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3468 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3469 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3470 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3471 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3472 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3473 ? "origin_upper_left" : "pixel_center_integer";
3475 _mesa_glsl_error(loc
, state
,
3476 "layout qualifier `%s' can only be applied to "
3477 "fragment shader input `gl_FragCoord'",
3481 if (qual
->flags
.q
.explicit_location
) {
3482 apply_explicit_location(qual
, var
, state
, loc
);
3484 if (qual
->flags
.q
.explicit_component
) {
3485 unsigned qual_component
;
3486 if (process_qualifier_constant(state
, loc
, "component",
3487 qual
->component
, &qual_component
)) {
3488 const glsl_type
*type
= var
->type
->without_array();
3489 unsigned components
= type
->component_slots();
3491 if (type
->is_matrix() || type
->is_record()) {
3492 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3493 "cannot be applied to a matrix, a structure, "
3494 "a block, or an array containing any of "
3496 } else if (qual_component
!= 0 &&
3497 (qual_component
+ components
- 1) > 3) {
3498 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3499 (qual_component
+ components
- 1));
3500 } else if (qual_component
== 1 && type
->is_64bit()) {
3501 /* We don't bother checking for 3 as it should be caught by the
3502 * overflow check above.
3504 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3505 "component 1 or 3");
3507 var
->data
.explicit_component
= true;
3508 var
->data
.location_frac
= qual_component
;
3512 } else if (qual
->flags
.q
.explicit_index
) {
3513 if (!qual
->flags
.q
.subroutine_def
)
3514 _mesa_glsl_error(loc
, state
,
3515 "explicit index requires explicit location");
3516 } else if (qual
->flags
.q
.explicit_component
) {
3517 _mesa_glsl_error(loc
, state
,
3518 "explicit component requires explicit location");
3521 if (qual
->flags
.q
.explicit_binding
) {
3522 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3525 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3526 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3527 unsigned qual_stream
;
3528 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3530 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3531 var
->data
.stream
= qual_stream
;
3535 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3536 unsigned qual_xfb_buffer
;
3537 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3538 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3539 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3540 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3541 if (qual
->flags
.q
.explicit_xfb_buffer
)
3542 var
->data
.explicit_xfb_buffer
= true;
3546 if (qual
->flags
.q
.explicit_xfb_offset
) {
3547 unsigned qual_xfb_offset
;
3548 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3550 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3551 qual
->offset
, &qual_xfb_offset
) &&
3552 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3553 var
->type
, component_size
)) {
3554 var
->data
.offset
= qual_xfb_offset
;
3555 var
->data
.explicit_xfb_offset
= true;
3559 if (qual
->flags
.q
.explicit_xfb_stride
) {
3560 unsigned qual_xfb_stride
;
3561 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3562 qual
->xfb_stride
, &qual_xfb_stride
)) {
3563 var
->data
.xfb_stride
= qual_xfb_stride
;
3564 var
->data
.explicit_xfb_stride
= true;
3568 if (var
->type
->contains_atomic()) {
3569 if (var
->data
.mode
== ir_var_uniform
) {
3570 if (var
->data
.explicit_binding
) {
3572 &state
->atomic_counter_offsets
[var
->data
.binding
];
3574 if (*offset
% ATOMIC_COUNTER_SIZE
)
3575 _mesa_glsl_error(loc
, state
,
3576 "misaligned atomic counter offset");
3578 var
->data
.offset
= *offset
;
3579 *offset
+= var
->type
->atomic_size();
3582 _mesa_glsl_error(loc
, state
,
3583 "atomic counters require explicit binding point");
3585 } else if (var
->data
.mode
!= ir_var_function_in
) {
3586 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3587 "function parameters or uniform-qualified "
3588 "global variables");
3592 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3593 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3594 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3595 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3596 * These extensions and all following extensions that add the 'layout'
3597 * keyword have been modified to require the use of 'in' or 'out'.
3599 * The following extension do not allow the deprecated keywords:
3601 * GL_AMD_conservative_depth
3602 * GL_ARB_conservative_depth
3603 * GL_ARB_gpu_shader5
3604 * GL_ARB_separate_shader_objects
3605 * GL_ARB_tessellation_shader
3606 * GL_ARB_transform_feedback3
3607 * GL_ARB_uniform_buffer_object
3609 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3610 * allow layout with the deprecated keywords.
3612 const bool relaxed_layout_qualifier_checking
=
3613 state
->ARB_fragment_coord_conventions_enable
;
3615 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3616 || qual
->flags
.q
.varying
;
3617 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3618 if (relaxed_layout_qualifier_checking
) {
3619 _mesa_glsl_warning(loc
, state
,
3620 "`layout' qualifier may not be used with "
3621 "`attribute' or `varying'");
3623 _mesa_glsl_error(loc
, state
,
3624 "`layout' qualifier may not be used with "
3625 "`attribute' or `varying'");
3629 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3630 * AMD_conservative_depth.
3632 if (qual
->flags
.q
.depth_type
3633 && !state
->is_version(420, 0)
3634 && !state
->AMD_conservative_depth_enable
3635 && !state
->ARB_conservative_depth_enable
) {
3636 _mesa_glsl_error(loc
, state
,
3637 "extension GL_AMD_conservative_depth or "
3638 "GL_ARB_conservative_depth must be enabled "
3639 "to use depth layout qualifiers");
3640 } else if (qual
->flags
.q
.depth_type
3641 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3642 _mesa_glsl_error(loc
, state
,
3643 "depth layout qualifiers can be applied only to "
3647 switch (qual
->depth_type
) {
3649 var
->data
.depth_layout
= ir_depth_layout_any
;
3651 case ast_depth_greater
:
3652 var
->data
.depth_layout
= ir_depth_layout_greater
;
3654 case ast_depth_less
:
3655 var
->data
.depth_layout
= ir_depth_layout_less
;
3657 case ast_depth_unchanged
:
3658 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3661 var
->data
.depth_layout
= ir_depth_layout_none
;
3665 if (qual
->flags
.q
.std140
||
3666 qual
->flags
.q
.std430
||
3667 qual
->flags
.q
.packed
||
3668 qual
->flags
.q
.shared
) {
3669 _mesa_glsl_error(loc
, state
,
3670 "uniform and shader storage block layout qualifiers "
3671 "std140, std430, packed, and shared can only be "
3672 "applied to uniform or shader storage blocks, not "
3676 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3677 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3680 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3683 * "Fragment shaders also allow the following layout qualifier on in only
3684 * (not with variable declarations)
3685 * layout-qualifier-id
3686 * early_fragment_tests
3689 if (qual
->flags
.q
.early_fragment_tests
) {
3690 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3691 "valid in fragment shader input layout declaration.");
3694 if (qual
->flags
.q
.inner_coverage
) {
3695 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3696 "valid in fragment shader input layout declaration.");
3699 if (qual
->flags
.q
.post_depth_coverage
) {
3700 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3701 "valid in fragment shader input layout declaration.");
3706 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3708 struct _mesa_glsl_parse_state
*state
,
3712 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3714 if (qual
->flags
.q
.invariant
) {
3715 if (var
->data
.used
) {
3716 _mesa_glsl_error(loc
, state
,
3717 "variable `%s' may not be redeclared "
3718 "`invariant' after being used",
3721 var
->data
.invariant
= 1;
3725 if (qual
->flags
.q
.precise
) {
3726 if (var
->data
.used
) {
3727 _mesa_glsl_error(loc
, state
,
3728 "variable `%s' may not be redeclared "
3729 "`precise' after being used",
3732 var
->data
.precise
= 1;
3736 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
3737 _mesa_glsl_error(loc
, state
,
3738 "`subroutine' may only be applied to uniforms, "
3739 "subroutine type declarations, or function definitions");
3742 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3743 || qual
->flags
.q
.uniform
3744 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3745 var
->data
.read_only
= 1;
3747 if (qual
->flags
.q
.centroid
)
3748 var
->data
.centroid
= 1;
3750 if (qual
->flags
.q
.sample
)
3751 var
->data
.sample
= 1;
3753 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3754 if (state
->es_shader
) {
3755 var
->data
.precision
=
3756 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3759 if (qual
->flags
.q
.patch
)
3760 var
->data
.patch
= 1;
3762 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3763 var
->type
= glsl_type::error_type
;
3764 _mesa_glsl_error(loc
, state
,
3765 "`attribute' variables may not be declared in the "
3767 _mesa_shader_stage_to_string(state
->stage
));
3770 /* Disallow layout qualifiers which may only appear on layout declarations. */
3771 if (qual
->flags
.q
.prim_type
) {
3772 _mesa_glsl_error(loc
, state
,
3773 "Primitive type may only be specified on GS input or output "
3774 "layout declaration, not on variables.");
3777 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3779 * "However, the const qualifier cannot be used with out or inout."
3781 * The same section of the GLSL 4.40 spec further clarifies this saying:
3783 * "The const qualifier cannot be used with out or inout, or a
3784 * compile-time error results."
3786 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3787 _mesa_glsl_error(loc
, state
,
3788 "`const' may not be applied to `out' or `inout' "
3789 "function parameters");
3792 /* If there is no qualifier that changes the mode of the variable, leave
3793 * the setting alone.
3795 assert(var
->data
.mode
!= ir_var_temporary
);
3796 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3797 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
3798 else if (qual
->flags
.q
.in
)
3799 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3800 else if (qual
->flags
.q
.attribute
3801 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3802 var
->data
.mode
= ir_var_shader_in
;
3803 else if (qual
->flags
.q
.out
)
3804 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3805 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3806 var
->data
.mode
= ir_var_shader_out
;
3807 else if (qual
->flags
.q
.uniform
)
3808 var
->data
.mode
= ir_var_uniform
;
3809 else if (qual
->flags
.q
.buffer
)
3810 var
->data
.mode
= ir_var_shader_storage
;
3811 else if (qual
->flags
.q
.shared_storage
)
3812 var
->data
.mode
= ir_var_shader_shared
;
3814 var
->data
.fb_fetch_output
= state
->stage
== MESA_SHADER_FRAGMENT
&&
3815 qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
3817 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3818 /* User-defined ins/outs are not permitted in compute shaders. */
3819 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3820 _mesa_glsl_error(loc
, state
,
3821 "user-defined input and output variables are not "
3822 "permitted in compute shaders");
3825 /* This variable is being used to link data between shader stages (in
3826 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3827 * that is allowed for such purposes.
3829 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3831 * "The varying qualifier can be used only with the data types
3832 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3835 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3836 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3838 * "Fragment inputs can only be signed and unsigned integers and
3839 * integer vectors, float, floating-point vectors, matrices, or
3840 * arrays of these. Structures cannot be input.
3842 * Similar text exists in the section on vertex shader outputs.
3844 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3845 * 3.00 spec allows structs as well. Varying structs are also allowed
3848 switch (var
->type
->get_scalar_type()->base_type
) {
3849 case GLSL_TYPE_FLOAT
:
3850 /* Ok in all GLSL versions */
3852 case GLSL_TYPE_UINT
:
3854 if (state
->is_version(130, 300))
3856 _mesa_glsl_error(loc
, state
,
3857 "varying variables must be of base type float in %s",
3858 state
->get_version_string());
3860 case GLSL_TYPE_STRUCT
:
3861 if (state
->is_version(150, 300))
3863 _mesa_glsl_error(loc
, state
,
3864 "varying variables may not be of type struct");
3866 case GLSL_TYPE_DOUBLE
:
3867 case GLSL_TYPE_UINT64
:
3868 case GLSL_TYPE_INT64
:
3871 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3876 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3877 switch (state
->stage
) {
3878 case MESA_SHADER_VERTEX
:
3879 if (var
->data
.mode
== ir_var_shader_out
)
3880 var
->data
.invariant
= true;
3882 case MESA_SHADER_TESS_CTRL
:
3883 case MESA_SHADER_TESS_EVAL
:
3884 case MESA_SHADER_GEOMETRY
:
3885 if ((var
->data
.mode
== ir_var_shader_in
)
3886 || (var
->data
.mode
== ir_var_shader_out
))
3887 var
->data
.invariant
= true;
3889 case MESA_SHADER_FRAGMENT
:
3890 if (var
->data
.mode
== ir_var_shader_in
)
3891 var
->data
.invariant
= true;
3893 case MESA_SHADER_COMPUTE
:
3894 /* Invariance isn't meaningful in compute shaders. */
3899 var
->data
.interpolation
=
3900 interpret_interpolation_qualifier(qual
, var
->type
,
3901 (ir_variable_mode
) var
->data
.mode
,
3904 /* Does the declaration use the deprecated 'attribute' or 'varying'
3907 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3908 || qual
->flags
.q
.varying
;
3911 /* Validate auxiliary storage qualifiers */
3913 /* From section 4.3.4 of the GLSL 1.30 spec:
3914 * "It is an error to use centroid in in a vertex shader."
3916 * From section 4.3.4 of the GLSL ES 3.00 spec:
3917 * "It is an error to use centroid in or interpolation qualifiers in
3918 * a vertex shader input."
3921 /* Section 4.3.6 of the GLSL 1.30 specification states:
3922 * "It is an error to use centroid out in a fragment shader."
3924 * The GL_ARB_shading_language_420pack extension specification states:
3925 * "It is an error to use auxiliary storage qualifiers or interpolation
3926 * qualifiers on an output in a fragment shader."
3928 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3929 _mesa_glsl_error(loc
, state
,
3930 "sample qualifier may only be used on `in` or `out` "
3931 "variables between shader stages");
3933 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3934 _mesa_glsl_error(loc
, state
,
3935 "centroid qualifier may only be used with `in', "
3936 "`out' or `varying' variables between shader stages");
3939 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3940 _mesa_glsl_error(loc
, state
,
3941 "the shared storage qualifiers can only be used with "
3945 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3949 * Get the variable that is being redeclared by this declaration or if it
3950 * does not exist, the current declared variable.
3952 * Semantic checks to verify the validity of the redeclaration are also
3953 * performed. If semantic checks fail, compilation error will be emitted via
3954 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3957 * A pointer to an existing variable in the current scope if the declaration
3958 * is a redeclaration, current variable otherwise. \c is_declared boolean
3959 * will return \c true if the declaration is a redeclaration, \c false
3962 static ir_variable
*
3963 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3964 struct _mesa_glsl_parse_state
*state
,
3965 bool allow_all_redeclarations
,
3966 bool *is_redeclaration
)
3968 /* Check if this declaration is actually a re-declaration, either to
3969 * resize an array or add qualifiers to an existing variable.
3971 * This is allowed for variables in the current scope, or when at
3972 * global scope (for built-ins in the implicit outer scope).
3974 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3975 if (earlier
== NULL
||
3976 (state
->current_function
!= NULL
&&
3977 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3978 *is_redeclaration
= false;
3982 *is_redeclaration
= true;
3984 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
3986 * "It is legal to declare an array without a size and then
3987 * later re-declare the same name as an array of the same
3988 * type and specify a size."
3990 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
3991 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3992 /* FINISHME: This doesn't match the qualifiers on the two
3993 * FINISHME: declarations. It's not 100% clear whether this is
3994 * FINISHME: required or not.
3997 const int size
= var
->type
->array_size();
3998 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3999 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4000 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4002 earlier
->data
.max_array_access
);
4005 earlier
->type
= var
->type
;
4008 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4009 state
->is_version(150, 0))
4010 && strcmp(var
->name
, "gl_FragCoord") == 0
4011 && earlier
->type
== var
->type
4012 && var
->data
.mode
== ir_var_shader_in
) {
4013 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4016 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
4017 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
4019 /* According to section 4.3.7 of the GLSL 1.30 spec,
4020 * the following built-in varaibles can be redeclared with an
4021 * interpolation qualifier:
4024 * * gl_FrontSecondaryColor
4025 * * gl_BackSecondaryColor
4027 * * gl_SecondaryColor
4029 } else if (state
->is_version(130, 0)
4030 && (strcmp(var
->name
, "gl_FrontColor") == 0
4031 || strcmp(var
->name
, "gl_BackColor") == 0
4032 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4033 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4034 || strcmp(var
->name
, "gl_Color") == 0
4035 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
4036 && earlier
->type
== var
->type
4037 && earlier
->data
.mode
== var
->data
.mode
) {
4038 earlier
->data
.interpolation
= var
->data
.interpolation
;
4040 /* Layout qualifiers for gl_FragDepth. */
4041 } else if ((state
->is_version(420, 0) ||
4042 state
->AMD_conservative_depth_enable
||
4043 state
->ARB_conservative_depth_enable
)
4044 && strcmp(var
->name
, "gl_FragDepth") == 0
4045 && earlier
->type
== var
->type
4046 && earlier
->data
.mode
== var
->data
.mode
) {
4048 /** From the AMD_conservative_depth spec:
4049 * Within any shader, the first redeclarations of gl_FragDepth
4050 * must appear before any use of gl_FragDepth.
4052 if (earlier
->data
.used
) {
4053 _mesa_glsl_error(&loc
, state
,
4054 "the first redeclaration of gl_FragDepth "
4055 "must appear before any use of gl_FragDepth");
4058 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4059 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4060 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4061 _mesa_glsl_error(&loc
, state
,
4062 "gl_FragDepth: depth layout is declared here "
4063 "as '%s, but it was previously declared as "
4065 depth_layout_string(var
->data
.depth_layout
),
4066 depth_layout_string(earlier
->data
.depth_layout
));
4069 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4071 } else if (state
->has_framebuffer_fetch() &&
4072 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4073 var
->type
== earlier
->type
&&
4074 var
->data
.mode
== ir_var_auto
) {
4075 /* According to the EXT_shader_framebuffer_fetch spec:
4077 * "By default, gl_LastFragData is declared with the mediump precision
4078 * qualifier. This can be changed by redeclaring the corresponding
4079 * variables with the desired precision qualifier."
4081 earlier
->data
.precision
= var
->data
.precision
;
4083 } else if (allow_all_redeclarations
) {
4084 if (earlier
->data
.mode
!= var
->data
.mode
) {
4085 _mesa_glsl_error(&loc
, state
,
4086 "redeclaration of `%s' with incorrect qualifiers",
4088 } else if (earlier
->type
!= var
->type
) {
4089 _mesa_glsl_error(&loc
, state
,
4090 "redeclaration of `%s' has incorrect type",
4094 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4101 * Generate the IR for an initializer in a variable declaration
4104 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4105 ast_fully_specified_type
*type
,
4106 exec_list
*initializer_instructions
,
4107 struct _mesa_glsl_parse_state
*state
)
4109 ir_rvalue
*result
= NULL
;
4111 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4113 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4115 * "All uniform variables are read-only and are initialized either
4116 * directly by an application via API commands, or indirectly by
4119 if (var
->data
.mode
== ir_var_uniform
) {
4120 state
->check_version(120, 0, &initializer_loc
,
4121 "cannot initialize uniform %s",
4125 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4127 * "Buffer variables cannot have initializers."
4129 if (var
->data
.mode
== ir_var_shader_storage
) {
4130 _mesa_glsl_error(&initializer_loc
, state
,
4131 "cannot initialize buffer variable %s",
4135 /* From section 4.1.7 of the GLSL 4.40 spec:
4137 * "Opaque variables [...] are initialized only through the
4138 * OpenGL API; they cannot be declared with an initializer in a
4141 if (var
->type
->contains_opaque()) {
4142 _mesa_glsl_error(&initializer_loc
, state
,
4143 "cannot initialize opaque variable %s",
4147 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4148 _mesa_glsl_error(&initializer_loc
, state
,
4149 "cannot initialize %s shader input / %s %s",
4150 _mesa_shader_stage_to_string(state
->stage
),
4151 (state
->stage
== MESA_SHADER_VERTEX
)
4152 ? "attribute" : "varying",
4156 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4157 _mesa_glsl_error(&initializer_loc
, state
,
4158 "cannot initialize %s shader output %s",
4159 _mesa_shader_stage_to_string(state
->stage
),
4163 /* If the initializer is an ast_aggregate_initializer, recursively store
4164 * type information from the LHS into it, so that its hir() function can do
4167 if (decl
->initializer
->oper
== ast_aggregate
)
4168 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4170 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4171 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4173 /* Calculate the constant value if this is a const or uniform
4176 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4178 * "Declarations of globals without a storage qualifier, or with
4179 * just the const qualifier, may include initializers, in which case
4180 * they will be initialized before the first line of main() is
4181 * executed. Such initializers must be a constant expression."
4183 * The same section of the GLSL ES 3.00.4 spec has similar language.
4185 if (type
->qualifier
.flags
.q
.constant
4186 || type
->qualifier
.flags
.q
.uniform
4187 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4188 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4190 if (new_rhs
!= NULL
) {
4193 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4196 * "A constant expression is one of
4200 * - an expression formed by an operator on operands that are
4201 * all constant expressions, including getting an element of
4202 * a constant array, or a field of a constant structure, or
4203 * components of a constant vector. However, the sequence
4204 * operator ( , ) and the assignment operators ( =, +=, ...)
4205 * are not included in the operators that can create a
4206 * constant expression."
4208 * Section 12.43 (Sequence operator and constant expressions) says:
4210 * "Should the following construct be allowed?
4214 * The expression within the brackets uses the sequence operator
4215 * (',') and returns the integer 3 so the construct is declaring
4216 * a single-dimensional array of size 3. In some languages, the
4217 * construct declares a two-dimensional array. It would be
4218 * preferable to make this construct illegal to avoid confusion.
4220 * One possibility is to change the definition of the sequence
4221 * operator so that it does not return a constant-expression and
4222 * hence cannot be used to declare an array size.
4224 * RESOLUTION: The result of a sequence operator is not a
4225 * constant-expression."
4227 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4228 * contains language almost identical to the section 4.3.3 in the
4229 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4232 ir_constant
*constant_value
= rhs
->constant_expression_value();
4233 if (!constant_value
||
4234 (state
->is_version(430, 300) &&
4235 decl
->initializer
->has_sequence_subexpression())) {
4236 const char *const variable_mode
=
4237 (type
->qualifier
.flags
.q
.constant
)
4239 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4241 /* If ARB_shading_language_420pack is enabled, initializers of
4242 * const-qualified local variables do not have to be constant
4243 * expressions. Const-qualified global variables must still be
4244 * initialized with constant expressions.
4246 if (!state
->has_420pack()
4247 || state
->current_function
== NULL
) {
4248 _mesa_glsl_error(& initializer_loc
, state
,
4249 "initializer of %s variable `%s' must be a "
4250 "constant expression",
4253 if (var
->type
->is_numeric()) {
4254 /* Reduce cascading errors. */
4255 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4256 ? ir_constant::zero(state
, var
->type
) : NULL
;
4260 rhs
= constant_value
;
4261 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4262 ? constant_value
: NULL
;
4265 if (var
->type
->is_numeric()) {
4266 /* Reduce cascading errors. */
4267 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4268 ? ir_constant::zero(state
, var
->type
) : NULL
;
4273 if (rhs
&& !rhs
->type
->is_error()) {
4274 bool temp
= var
->data
.read_only
;
4275 if (type
->qualifier
.flags
.q
.constant
)
4276 var
->data
.read_only
= false;
4278 /* Never emit code to initialize a uniform.
4280 const glsl_type
*initializer_type
;
4281 if (!type
->qualifier
.flags
.q
.uniform
) {
4282 do_assignment(initializer_instructions
, state
,
4287 type
->get_location());
4288 initializer_type
= result
->type
;
4290 initializer_type
= rhs
->type
;
4292 var
->constant_initializer
= rhs
->constant_expression_value();
4293 var
->data
.has_initializer
= true;
4295 /* If the declared variable is an unsized array, it must inherrit
4296 * its full type from the initializer. A declaration such as
4298 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4302 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4304 * The assignment generated in the if-statement (below) will also
4305 * automatically handle this case for non-uniforms.
4307 * If the declared variable is not an array, the types must
4308 * already match exactly. As a result, the type assignment
4309 * here can be done unconditionally. For non-uniforms the call
4310 * to do_assignment can change the type of the initializer (via
4311 * the implicit conversion rules). For uniforms the initializer
4312 * must be a constant expression, and the type of that expression
4313 * was validated above.
4315 var
->type
= initializer_type
;
4317 var
->data
.read_only
= temp
;
4324 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4325 YYLTYPE loc
, ir_variable
*var
,
4326 unsigned num_vertices
,
4328 const char *var_category
)
4330 if (var
->type
->is_unsized_array()) {
4331 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4333 * All geometry shader input unsized array declarations will be
4334 * sized by an earlier input layout qualifier, when present, as per
4335 * the following table.
4337 * Followed by a table mapping each allowed input layout qualifier to
4338 * the corresponding input length.
4340 * Similarly for tessellation control shader outputs.
4342 if (num_vertices
!= 0)
4343 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4346 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4347 * includes the following examples of compile-time errors:
4349 * // code sequence within one shader...
4350 * in vec4 Color1[]; // size unknown
4351 * ...Color1.length()...// illegal, length() unknown
4352 * in vec4 Color2[2]; // size is 2
4353 * ...Color1.length()...// illegal, Color1 still has no size
4354 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4355 * layout(lines) in; // legal, input size is 2, matching
4356 * in vec4 Color4[3]; // illegal, contradicts layout
4359 * To detect the case illustrated by Color3, we verify that the size of
4360 * an explicitly-sized array matches the size of any previously declared
4361 * explicitly-sized array. To detect the case illustrated by Color4, we
4362 * verify that the size of an explicitly-sized array is consistent with
4363 * any previously declared input layout.
4365 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4366 _mesa_glsl_error(&loc
, state
,
4367 "%s size contradicts previously declared layout "
4368 "(size is %u, but layout requires a size of %u)",
4369 var_category
, var
->type
->length
, num_vertices
);
4370 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4371 _mesa_glsl_error(&loc
, state
,
4372 "%s sizes are inconsistent (size is %u, but a "
4373 "previous declaration has size %u)",
4374 var_category
, var
->type
->length
, *size
);
4376 *size
= var
->type
->length
;
4382 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4383 YYLTYPE loc
, ir_variable
*var
)
4385 unsigned num_vertices
= 0;
4387 if (state
->tcs_output_vertices_specified
) {
4388 if (!state
->out_qualifier
->vertices
->
4389 process_qualifier_constant(state
, "vertices",
4390 &num_vertices
, false)) {
4394 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4395 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4396 "GL_MAX_PATCH_VERTICES", num_vertices
);
4401 if (!var
->type
->is_array() && !var
->data
.patch
) {
4402 _mesa_glsl_error(&loc
, state
,
4403 "tessellation control shader outputs must be arrays");
4405 /* To avoid cascading failures, short circuit the checks below. */
4409 if (var
->data
.patch
)
4412 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4413 &state
->tcs_output_size
,
4414 "tessellation control shader output");
4418 * Do additional processing necessary for tessellation control/evaluation shader
4419 * input declarations. This covers both interface block arrays and bare input
4423 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4424 YYLTYPE loc
, ir_variable
*var
)
4426 if (!var
->type
->is_array() && !var
->data
.patch
) {
4427 _mesa_glsl_error(&loc
, state
,
4428 "per-vertex tessellation shader inputs must be arrays");
4429 /* Avoid cascading failures. */
4433 if (var
->data
.patch
)
4436 /* The ARB_tessellation_shader spec says:
4438 * "Declaring an array size is optional. If no size is specified, it
4439 * will be taken from the implementation-dependent maximum patch size
4440 * (gl_MaxPatchVertices). If a size is specified, it must match the
4441 * maximum patch size; otherwise, a compile or link error will occur."
4443 * This text appears twice, once for TCS inputs, and again for TES inputs.
4445 if (var
->type
->is_unsized_array()) {
4446 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4447 state
->Const
.MaxPatchVertices
);
4448 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4449 _mesa_glsl_error(&loc
, state
,
4450 "per-vertex tessellation shader input arrays must be "
4451 "sized to gl_MaxPatchVertices (%d).",
4452 state
->Const
.MaxPatchVertices
);
4458 * Do additional processing necessary for geometry shader input declarations
4459 * (this covers both interface blocks arrays and bare input variables).
4462 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4463 YYLTYPE loc
, ir_variable
*var
)
4465 unsigned num_vertices
= 0;
4467 if (state
->gs_input_prim_type_specified
) {
4468 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4471 /* Geometry shader input variables must be arrays. Caller should have
4472 * reported an error for this.
4474 if (!var
->type
->is_array()) {
4475 assert(state
->error
);
4477 /* To avoid cascading failures, short circuit the checks below. */
4481 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4482 &state
->gs_input_size
,
4483 "geometry shader input");
4487 validate_identifier(const char *identifier
, YYLTYPE loc
,
4488 struct _mesa_glsl_parse_state
*state
)
4490 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4492 * "Identifiers starting with "gl_" are reserved for use by
4493 * OpenGL, and may not be declared in a shader as either a
4494 * variable or a function."
4496 if (is_gl_identifier(identifier
)) {
4497 _mesa_glsl_error(&loc
, state
,
4498 "identifier `%s' uses reserved `gl_' prefix",
4500 } else if (strstr(identifier
, "__")) {
4501 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4504 * "In addition, all identifiers containing two
4505 * consecutive underscores (__) are reserved as
4506 * possible future keywords."
4508 * The intention is that names containing __ are reserved for internal
4509 * use by the implementation, and names prefixed with GL_ are reserved
4510 * for use by Khronos. Names simply containing __ are dangerous to use,
4511 * but should be allowed.
4513 * A future version of the GLSL specification will clarify this.
4515 _mesa_glsl_warning(&loc
, state
,
4516 "identifier `%s' uses reserved `__' string",
4522 ast_declarator_list::hir(exec_list
*instructions
,
4523 struct _mesa_glsl_parse_state
*state
)
4526 const struct glsl_type
*decl_type
;
4527 const char *type_name
= NULL
;
4528 ir_rvalue
*result
= NULL
;
4529 YYLTYPE loc
= this->get_location();
4531 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4533 * "To ensure that a particular output variable is invariant, it is
4534 * necessary to use the invariant qualifier. It can either be used to
4535 * qualify a previously declared variable as being invariant
4537 * invariant gl_Position; // make existing gl_Position be invariant"
4539 * In these cases the parser will set the 'invariant' flag in the declarator
4540 * list, and the type will be NULL.
4542 if (this->invariant
) {
4543 assert(this->type
== NULL
);
4545 if (state
->current_function
!= NULL
) {
4546 _mesa_glsl_error(& loc
, state
,
4547 "all uses of `invariant' keyword must be at global "
4551 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4552 assert(decl
->array_specifier
== NULL
);
4553 assert(decl
->initializer
== NULL
);
4555 ir_variable
*const earlier
=
4556 state
->symbols
->get_variable(decl
->identifier
);
4557 if (earlier
== NULL
) {
4558 _mesa_glsl_error(& loc
, state
,
4559 "undeclared variable `%s' cannot be marked "
4560 "invariant", decl
->identifier
);
4561 } else if (!is_allowed_invariant(earlier
, state
)) {
4562 _mesa_glsl_error(&loc
, state
,
4563 "`%s' cannot be marked invariant; interfaces between "
4564 "shader stages only.", decl
->identifier
);
4565 } else if (earlier
->data
.used
) {
4566 _mesa_glsl_error(& loc
, state
,
4567 "variable `%s' may not be redeclared "
4568 "`invariant' after being used",
4571 earlier
->data
.invariant
= true;
4575 /* Invariant redeclarations do not have r-values.
4580 if (this->precise
) {
4581 assert(this->type
== NULL
);
4583 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4584 assert(decl
->array_specifier
== NULL
);
4585 assert(decl
->initializer
== NULL
);
4587 ir_variable
*const earlier
=
4588 state
->symbols
->get_variable(decl
->identifier
);
4589 if (earlier
== NULL
) {
4590 _mesa_glsl_error(& loc
, state
,
4591 "undeclared variable `%s' cannot be marked "
4592 "precise", decl
->identifier
);
4593 } else if (state
->current_function
!= NULL
&&
4594 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4595 /* Note: we have to check if we're in a function, since
4596 * builtins are treated as having come from another scope.
4598 _mesa_glsl_error(& loc
, state
,
4599 "variable `%s' from an outer scope may not be "
4600 "redeclared `precise' in this scope",
4602 } else if (earlier
->data
.used
) {
4603 _mesa_glsl_error(& loc
, state
,
4604 "variable `%s' may not be redeclared "
4605 "`precise' after being used",
4608 earlier
->data
.precise
= true;
4612 /* Precise redeclarations do not have r-values either. */
4616 assert(this->type
!= NULL
);
4617 assert(!this->invariant
);
4618 assert(!this->precise
);
4620 /* The type specifier may contain a structure definition. Process that
4621 * before any of the variable declarations.
4623 (void) this->type
->specifier
->hir(instructions
, state
);
4625 decl_type
= this->type
->glsl_type(& type_name
, state
);
4627 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4628 * "Buffer variables may only be declared inside interface blocks
4629 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4630 * shader storage blocks. It is a compile-time error to declare buffer
4631 * variables at global scope (outside a block)."
4633 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4634 _mesa_glsl_error(&loc
, state
,
4635 "buffer variables cannot be declared outside "
4636 "interface blocks");
4639 /* An offset-qualified atomic counter declaration sets the default
4640 * offset for the next declaration within the same atomic counter
4643 if (decl_type
&& decl_type
->contains_atomic()) {
4644 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4645 type
->qualifier
.flags
.q
.explicit_offset
) {
4646 unsigned qual_binding
;
4647 unsigned qual_offset
;
4648 if (process_qualifier_constant(state
, &loc
, "binding",
4649 type
->qualifier
.binding
,
4651 && process_qualifier_constant(state
, &loc
, "offset",
4652 type
->qualifier
.offset
,
4654 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4658 ast_type_qualifier allowed_atomic_qual_mask
;
4659 allowed_atomic_qual_mask
.flags
.i
= 0;
4660 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4661 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4662 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4664 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4665 "invalid layout qualifier for",
4669 if (this->declarations
.is_empty()) {
4670 /* If there is no structure involved in the program text, there are two
4671 * possible scenarios:
4673 * - The program text contained something like 'vec4;'. This is an
4674 * empty declaration. It is valid but weird. Emit a warning.
4676 * - The program text contained something like 'S;' and 'S' is not the
4677 * name of a known structure type. This is both invalid and weird.
4680 * - The program text contained something like 'mediump float;'
4681 * when the programmer probably meant 'precision mediump
4682 * float;' Emit a warning with a description of what they
4683 * probably meant to do.
4685 * Note that if decl_type is NULL and there is a structure involved,
4686 * there must have been some sort of error with the structure. In this
4687 * case we assume that an error was already generated on this line of
4688 * code for the structure. There is no need to generate an additional,
4691 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4694 if (decl_type
== NULL
) {
4695 _mesa_glsl_error(&loc
, state
,
4696 "invalid type `%s' in empty declaration",
4699 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4700 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4703 * "... any declaration that leaves the size undefined is
4704 * disallowed as this would add complexity and there are no
4707 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4708 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4709 "or implicitly defined");
4712 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4714 * "The combinations of types and qualifiers that cause
4715 * compile-time or link-time errors are the same whether or not
4716 * the declaration is empty."
4718 validate_array_dimensions(decl_type
, state
, &loc
);
4721 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4722 /* Empty atomic counter declarations are allowed and useful
4723 * to set the default offset qualifier.
4726 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4727 if (this->type
->specifier
->structure
!= NULL
) {
4728 _mesa_glsl_error(&loc
, state
,
4729 "precision qualifiers can't be applied "
4732 static const char *const precision_names
[] = {
4739 _mesa_glsl_warning(&loc
, state
,
4740 "empty declaration with precision "
4741 "qualifier, to set the default precision, "
4742 "use `precision %s %s;'",
4743 precision_names
[this->type
->
4744 qualifier
.precision
],
4747 } else if (this->type
->specifier
->structure
== NULL
) {
4748 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4753 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4754 const struct glsl_type
*var_type
;
4756 const char *identifier
= decl
->identifier
;
4757 /* FINISHME: Emit a warning if a variable declaration shadows a
4758 * FINISHME: declaration at a higher scope.
4761 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4762 if (type_name
!= NULL
) {
4763 _mesa_glsl_error(& loc
, state
,
4764 "invalid type `%s' in declaration of `%s'",
4765 type_name
, decl
->identifier
);
4767 _mesa_glsl_error(& loc
, state
,
4768 "invalid type in declaration of `%s'",
4774 if (this->type
->qualifier
.flags
.q
.subroutine
) {
4778 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4780 _mesa_glsl_error(& loc
, state
,
4781 "invalid type in declaration of `%s'",
4783 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4788 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4791 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4793 /* The 'varying in' and 'varying out' qualifiers can only be used with
4794 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4797 if (this->type
->qualifier
.flags
.q
.varying
) {
4798 if (this->type
->qualifier
.flags
.q
.in
) {
4799 _mesa_glsl_error(& loc
, state
,
4800 "`varying in' qualifier in declaration of "
4801 "`%s' only valid for geometry shaders using "
4802 "ARB_geometry_shader4 or EXT_geometry_shader4",
4804 } else if (this->type
->qualifier
.flags
.q
.out
) {
4805 _mesa_glsl_error(& loc
, state
,
4806 "`varying out' qualifier in declaration of "
4807 "`%s' only valid for geometry shaders using "
4808 "ARB_geometry_shader4 or EXT_geometry_shader4",
4813 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4815 * "Global variables can only use the qualifiers const,
4816 * attribute, uniform, or varying. Only one may be
4819 * Local variables can only use the qualifier const."
4821 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4822 * any extension that adds the 'layout' keyword.
4824 if (!state
->is_version(130, 300)
4825 && !state
->has_explicit_attrib_location()
4826 && !state
->has_separate_shader_objects()
4827 && !state
->ARB_fragment_coord_conventions_enable
) {
4828 if (this->type
->qualifier
.flags
.q
.out
) {
4829 _mesa_glsl_error(& loc
, state
,
4830 "`out' qualifier in declaration of `%s' "
4831 "only valid for function parameters in %s",
4832 decl
->identifier
, state
->get_version_string());
4834 if (this->type
->qualifier
.flags
.q
.in
) {
4835 _mesa_glsl_error(& loc
, state
,
4836 "`in' qualifier in declaration of `%s' "
4837 "only valid for function parameters in %s",
4838 decl
->identifier
, state
->get_version_string());
4840 /* FINISHME: Test for other invalid qualifiers. */
4843 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4845 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4848 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
4849 && (var
->type
->is_numeric() || var
->type
->is_boolean())
4850 && state
->zero_init
) {
4851 const ir_constant_data data
= { { 0 } };
4852 var
->data
.has_initializer
= true;
4853 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
4856 if (this->type
->qualifier
.flags
.q
.invariant
) {
4857 if (!is_allowed_invariant(var
, state
)) {
4858 _mesa_glsl_error(&loc
, state
,
4859 "`%s' cannot be marked invariant; interfaces between "
4860 "shader stages only", var
->name
);
4864 if (state
->current_function
!= NULL
) {
4865 const char *mode
= NULL
;
4866 const char *extra
= "";
4868 /* There is no need to check for 'inout' here because the parser will
4869 * only allow that in function parameter lists.
4871 if (this->type
->qualifier
.flags
.q
.attribute
) {
4873 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
4874 mode
= "subroutine uniform";
4875 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4877 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4879 } else if (this->type
->qualifier
.flags
.q
.in
) {
4881 extra
= " or in function parameter list";
4882 } else if (this->type
->qualifier
.flags
.q
.out
) {
4884 extra
= " or in function parameter list";
4888 _mesa_glsl_error(& loc
, state
,
4889 "%s variable `%s' must be declared at "
4891 mode
, var
->name
, extra
);
4893 } else if (var
->data
.mode
== ir_var_shader_in
) {
4894 var
->data
.read_only
= true;
4896 if (state
->stage
== MESA_SHADER_VERTEX
) {
4897 bool error_emitted
= false;
4899 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4901 * "Vertex shader inputs can only be float, floating-point
4902 * vectors, matrices, signed and unsigned integers and integer
4903 * vectors. Vertex shader inputs can also form arrays of these
4904 * types, but not structures."
4906 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4908 * "Vertex shader inputs can only be float, floating-point
4909 * vectors, matrices, signed and unsigned integers and integer
4910 * vectors. They cannot be arrays or structures."
4912 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4914 * "The attribute qualifier can be used only with float,
4915 * floating-point vectors, and matrices. Attribute variables
4916 * cannot be declared as arrays or structures."
4918 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4920 * "Vertex shader inputs can only be float, floating-point
4921 * vectors, matrices, signed and unsigned integers and integer
4922 * vectors. Vertex shader inputs cannot be arrays or
4925 const glsl_type
*check_type
= var
->type
->without_array();
4927 switch (check_type
->base_type
) {
4928 case GLSL_TYPE_FLOAT
:
4930 case GLSL_TYPE_UINT64
:
4931 case GLSL_TYPE_INT64
:
4933 case GLSL_TYPE_UINT
:
4935 if (state
->is_version(120, 300))
4937 case GLSL_TYPE_DOUBLE
:
4938 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4942 _mesa_glsl_error(& loc
, state
,
4943 "vertex shader input / attribute cannot have "
4945 var
->type
->is_array() ? "array of " : "",
4947 error_emitted
= true;
4950 if (!error_emitted
&& var
->type
->is_array() &&
4951 !state
->check_version(150, 0, &loc
,
4952 "vertex shader input / attribute "
4953 "cannot have array type")) {
4954 error_emitted
= true;
4956 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4957 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4959 * Geometry shader input variables get the per-vertex values
4960 * written out by vertex shader output variables of the same
4961 * names. Since a geometry shader operates on a set of
4962 * vertices, each input varying variable (or input block, see
4963 * interface blocks below) needs to be declared as an array.
4965 if (!var
->type
->is_array()) {
4966 _mesa_glsl_error(&loc
, state
,
4967 "geometry shader inputs must be arrays");
4970 handle_geometry_shader_input_decl(state
, loc
, var
);
4971 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4972 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4974 * It is a compile-time error to declare a fragment shader
4975 * input with, or that contains, any of the following types:
4979 * * An array of arrays
4980 * * An array of structures
4981 * * A structure containing an array
4982 * * A structure containing a structure
4984 if (state
->es_shader
) {
4985 const glsl_type
*check_type
= var
->type
->without_array();
4986 if (check_type
->is_boolean() ||
4987 check_type
->contains_opaque()) {
4988 _mesa_glsl_error(&loc
, state
,
4989 "fragment shader input cannot have type %s",
4992 if (var
->type
->is_array() &&
4993 var
->type
->fields
.array
->is_array()) {
4994 _mesa_glsl_error(&loc
, state
,
4996 "cannot have an array of arrays",
4997 _mesa_shader_stage_to_string(state
->stage
));
4999 if (var
->type
->is_array() &&
5000 var
->type
->fields
.array
->is_record()) {
5001 _mesa_glsl_error(&loc
, state
,
5002 "fragment shader input "
5003 "cannot have an array of structs");
5005 if (var
->type
->is_record()) {
5006 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5007 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5008 var
->type
->fields
.structure
[i
].type
->is_record())
5009 _mesa_glsl_error(&loc
, state
,
5010 "fragement shader input cannot have "
5011 "a struct that contains an "
5016 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5017 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5018 handle_tess_shader_input_decl(state
, loc
, var
);
5020 } else if (var
->data
.mode
== ir_var_shader_out
) {
5021 const glsl_type
*check_type
= var
->type
->without_array();
5023 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5025 * It is a compile-time error to declare a vertex, tessellation
5026 * evaluation, tessellation control, or geometry shader output
5027 * that contains any of the following:
5029 * * A Boolean type (bool, bvec2 ...)
5032 if (check_type
->is_boolean() || check_type
->contains_opaque())
5033 _mesa_glsl_error(&loc
, state
,
5034 "%s shader output cannot have type %s",
5035 _mesa_shader_stage_to_string(state
->stage
),
5038 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5040 * It is a compile-time error to declare a fragment shader output
5041 * that contains any of the following:
5043 * * A Boolean type (bool, bvec2 ...)
5044 * * A double-precision scalar or vector (double, dvec2 ...)
5049 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5050 if (check_type
->is_record() || check_type
->is_matrix())
5051 _mesa_glsl_error(&loc
, state
,
5052 "fragment shader output "
5053 "cannot have struct or matrix type");
5054 switch (check_type
->base_type
) {
5055 case GLSL_TYPE_UINT
:
5057 case GLSL_TYPE_FLOAT
:
5060 _mesa_glsl_error(&loc
, state
,
5061 "fragment shader output cannot have "
5062 "type %s", check_type
->name
);
5066 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5068 * It is a compile-time error to declare a vertex shader output
5069 * with, or that contains, any of the following types:
5073 * * An array of arrays
5074 * * An array of structures
5075 * * A structure containing an array
5076 * * A structure containing a structure
5078 * It is a compile-time error to declare a fragment shader output
5079 * with, or that contains, any of the following types:
5085 * * An array of array
5087 * ES 3.20 updates this to apply to tessellation and geometry shaders
5088 * as well. Because there are per-vertex arrays in the new stages,
5089 * it strikes the "array of..." rules and replaces them with these:
5091 * * For per-vertex-arrayed variables (applies to tessellation
5092 * control, tessellation evaluation and geometry shaders):
5094 * * Per-vertex-arrayed arrays of arrays
5095 * * Per-vertex-arrayed arrays of structures
5097 * * For non-per-vertex-arrayed variables:
5099 * * An array of arrays
5100 * * An array of structures
5102 * which basically says to unwrap the per-vertex aspect and apply
5105 if (state
->es_shader
) {
5106 if (var
->type
->is_array() &&
5107 var
->type
->fields
.array
->is_array()) {
5108 _mesa_glsl_error(&loc
, state
,
5110 "cannot have an array of arrays",
5111 _mesa_shader_stage_to_string(state
->stage
));
5113 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5114 const glsl_type
*type
= var
->type
;
5116 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5117 !var
->data
.patch
&& var
->type
->is_array()) {
5118 type
= var
->type
->fields
.array
;
5121 if (type
->is_array() && type
->fields
.array
->is_record()) {
5122 _mesa_glsl_error(&loc
, state
,
5123 "%s shader output cannot have "
5124 "an array of structs",
5125 _mesa_shader_stage_to_string(state
->stage
));
5127 if (type
->is_record()) {
5128 for (unsigned i
= 0; i
< type
->length
; i
++) {
5129 if (type
->fields
.structure
[i
].type
->is_array() ||
5130 type
->fields
.structure
[i
].type
->is_record())
5131 _mesa_glsl_error(&loc
, state
,
5132 "%s shader output cannot have a "
5133 "struct that contains an "
5135 _mesa_shader_stage_to_string(state
->stage
));
5141 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5142 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5144 } else if (var
->type
->contains_subroutine()) {
5145 /* declare subroutine uniforms as hidden */
5146 var
->data
.how_declared
= ir_var_hidden
;
5149 /* From section 4.3.4 of the GLSL 4.00 spec:
5150 * "Input variables may not be declared using the patch in qualifier
5151 * in tessellation control or geometry shaders."
5153 * From section 4.3.6 of the GLSL 4.00 spec:
5154 * "It is an error to use patch out in a vertex, tessellation
5155 * evaluation, or geometry shader."
5157 * This doesn't explicitly forbid using them in a fragment shader, but
5158 * that's probably just an oversight.
5160 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5161 && this->type
->qualifier
.flags
.q
.patch
5162 && this->type
->qualifier
.flags
.q
.in
) {
5164 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5165 "tessellation evaluation shader");
5168 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5169 && this->type
->qualifier
.flags
.q
.patch
5170 && this->type
->qualifier
.flags
.q
.out
) {
5172 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5173 "tessellation control shader");
5176 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5178 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5179 state
->check_precision_qualifiers_allowed(&loc
);
5182 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5183 !precision_qualifier_allowed(var
->type
)) {
5184 _mesa_glsl_error(&loc
, state
,
5185 "precision qualifiers apply only to floating point"
5186 ", integer and opaque types");
5189 /* From section 4.1.7 of the GLSL 4.40 spec:
5191 * "[Opaque types] can only be declared as function
5192 * parameters or uniform-qualified variables."
5194 if (var_type
->contains_opaque() &&
5195 !this->type
->qualifier
.flags
.q
.uniform
) {
5196 _mesa_glsl_error(&loc
, state
,
5197 "opaque variables must be declared uniform");
5200 /* Process the initializer and add its instructions to a temporary
5201 * list. This list will be added to the instruction stream (below) after
5202 * the declaration is added. This is done because in some cases (such as
5203 * redeclarations) the declaration may not actually be added to the
5204 * instruction stream.
5206 exec_list initializer_instructions
;
5208 /* Examine var name here since var may get deleted in the next call */
5209 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5211 bool is_redeclaration
;
5212 ir_variable
*declared_var
=
5213 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5214 false /* allow_all_redeclarations */,
5216 if (is_redeclaration
) {
5218 declared_var
->data
.how_declared
== ir_var_declared_in_block
) {
5219 _mesa_glsl_error(&loc
, state
,
5220 "`%s' has already been redeclared using "
5221 "gl_PerVertex", declared_var
->name
);
5223 declared_var
->data
.how_declared
= ir_var_declared_normally
;
5226 if (decl
->initializer
!= NULL
) {
5227 result
= process_initializer(declared_var
,
5229 &initializer_instructions
, state
);
5231 validate_array_dimensions(var_type
, state
, &loc
);
5234 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5236 * "It is an error to write to a const variable outside of
5237 * its declaration, so they must be initialized when
5240 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5241 _mesa_glsl_error(& loc
, state
,
5242 "const declaration of `%s' must be initialized",
5246 if (state
->es_shader
) {
5247 const glsl_type
*const t
= declared_var
->type
;
5249 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5251 * The GL_OES_tessellation_shader spec says about inputs:
5253 * "Declaring an array size is optional. If no size is specified,
5254 * it will be taken from the implementation-dependent maximum
5255 * patch size (gl_MaxPatchVertices)."
5257 * and about TCS outputs:
5259 * "If no size is specified, it will be taken from output patch
5260 * size declared in the shader."
5262 * The GL_OES_geometry_shader spec says:
5264 * "All geometry shader input unsized array declarations will be
5265 * sized by an earlier input primitive layout qualifier, when
5266 * present, as per the following table."
5268 const bool implicitly_sized
=
5269 (declared_var
->data
.mode
== ir_var_shader_in
&&
5270 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5271 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5272 (declared_var
->data
.mode
== ir_var_shader_out
&&
5273 state
->stage
== MESA_SHADER_TESS_CTRL
);
5275 if (t
->is_unsized_array() && !implicitly_sized
)
5276 /* Section 10.17 of the GLSL ES 1.00 specification states that
5277 * unsized array declarations have been removed from the language.
5278 * Arrays that are sized using an initializer are still explicitly
5279 * sized. However, GLSL ES 1.00 does not allow array
5280 * initializers. That is only allowed in GLSL ES 3.00.
5282 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5284 * "An array type can also be formed without specifying a size
5285 * if the definition includes an initializer:
5287 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5288 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5293 _mesa_glsl_error(& loc
, state
,
5294 "unsized array declarations are not allowed in "
5298 /* If the declaration is not a redeclaration, there are a few additional
5299 * semantic checks that must be applied. In addition, variable that was
5300 * created for the declaration should be added to the IR stream.
5302 if (!is_redeclaration
) {
5303 validate_identifier(decl
->identifier
, loc
, state
);
5305 /* Add the variable to the symbol table. Note that the initializer's
5306 * IR was already processed earlier (though it hasn't been emitted
5307 * yet), without the variable in scope.
5309 * This differs from most C-like languages, but it follows the GLSL
5310 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5313 * "Within a declaration, the scope of a name starts immediately
5314 * after the initializer if present or immediately after the name
5315 * being declared if not."
5317 if (!state
->symbols
->add_variable(declared_var
)) {
5318 YYLTYPE loc
= this->get_location();
5319 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5320 "current scope", decl
->identifier
);
5324 /* Push the variable declaration to the top. It means that all the
5325 * variable declarations will appear in a funny last-to-first order,
5326 * but otherwise we run into trouble if a function is prototyped, a
5327 * global var is decled, then the function is defined with usage of
5328 * the global var. See glslparsertest's CorrectModule.frag.
5330 instructions
->push_head(declared_var
);
5333 instructions
->append_list(&initializer_instructions
);
5337 /* Generally, variable declarations do not have r-values. However,
5338 * one is used for the declaration in
5340 * while (bool b = some_condition()) {
5344 * so we return the rvalue from the last seen declaration here.
5351 ast_parameter_declarator::hir(exec_list
*instructions
,
5352 struct _mesa_glsl_parse_state
*state
)
5355 const struct glsl_type
*type
;
5356 const char *name
= NULL
;
5357 YYLTYPE loc
= this->get_location();
5359 type
= this->type
->glsl_type(& name
, state
);
5363 _mesa_glsl_error(& loc
, state
,
5364 "invalid type `%s' in declaration of `%s'",
5365 name
, this->identifier
);
5367 _mesa_glsl_error(& loc
, state
,
5368 "invalid type in declaration of `%s'",
5372 type
= glsl_type::error_type
;
5375 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5377 * "Functions that accept no input arguments need not use void in the
5378 * argument list because prototypes (or definitions) are required and
5379 * therefore there is no ambiguity when an empty argument list "( )" is
5380 * declared. The idiom "(void)" as a parameter list is provided for
5383 * Placing this check here prevents a void parameter being set up
5384 * for a function, which avoids tripping up checks for main taking
5385 * parameters and lookups of an unnamed symbol.
5387 if (type
->is_void()) {
5388 if (this->identifier
!= NULL
)
5389 _mesa_glsl_error(& loc
, state
,
5390 "named parameter cannot have type `void'");
5396 if (formal_parameter
&& (this->identifier
== NULL
)) {
5397 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5401 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5402 * call already handled the "vec4[..] foo" case.
5404 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5406 if (!type
->is_error() && type
->is_unsized_array()) {
5407 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5409 type
= glsl_type::error_type
;
5413 ir_variable
*var
= new(ctx
)
5414 ir_variable(type
, this->identifier
, ir_var_function_in
);
5416 /* Apply any specified qualifiers to the parameter declaration. Note that
5417 * for function parameters the default mode is 'in'.
5419 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5422 /* From section 4.1.7 of the GLSL 4.40 spec:
5424 * "Opaque variables cannot be treated as l-values; hence cannot
5425 * be used as out or inout function parameters, nor can they be
5428 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5429 && type
->contains_opaque()) {
5430 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5431 "contain opaque variables");
5432 type
= glsl_type::error_type
;
5435 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5437 * "When calling a function, expressions that do not evaluate to
5438 * l-values cannot be passed to parameters declared as out or inout."
5440 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5442 * "Other binary or unary expressions, non-dereferenced arrays,
5443 * function names, swizzles with repeated fields, and constants
5444 * cannot be l-values."
5446 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5447 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5449 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5451 && !state
->check_version(120, 100, &loc
,
5452 "arrays cannot be out or inout parameters")) {
5453 type
= glsl_type::error_type
;
5456 instructions
->push_tail(var
);
5458 /* Parameter declarations do not have r-values.
5465 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5467 exec_list
*ir_parameters
,
5468 _mesa_glsl_parse_state
*state
)
5470 ast_parameter_declarator
*void_param
= NULL
;
5473 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5474 param
->formal_parameter
= formal
;
5475 param
->hir(ir_parameters
, state
);
5483 if ((void_param
!= NULL
) && (count
> 1)) {
5484 YYLTYPE loc
= void_param
->get_location();
5486 _mesa_glsl_error(& loc
, state
,
5487 "`void' parameter must be only parameter");
5493 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5495 /* IR invariants disallow function declarations or definitions
5496 * nested within other function definitions. But there is no
5497 * requirement about the relative order of function declarations
5498 * and definitions with respect to one another. So simply insert
5499 * the new ir_function block at the end of the toplevel instruction
5502 state
->toplevel_ir
->push_tail(f
);
5507 ast_function::hir(exec_list
*instructions
,
5508 struct _mesa_glsl_parse_state
*state
)
5511 ir_function
*f
= NULL
;
5512 ir_function_signature
*sig
= NULL
;
5513 exec_list hir_parameters
;
5514 YYLTYPE loc
= this->get_location();
5516 const char *const name
= identifier
;
5518 /* New functions are always added to the top-level IR instruction stream,
5519 * so this instruction list pointer is ignored. See also emit_function
5522 (void) instructions
;
5524 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5526 * "Function declarations (prototypes) cannot occur inside of functions;
5527 * they must be at global scope, or for the built-in functions, outside
5528 * the global scope."
5530 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5532 * "User defined functions may only be defined within the global scope."
5534 * Note that this language does not appear in GLSL 1.10.
5536 if ((state
->current_function
!= NULL
) &&
5537 state
->is_version(120, 100)) {
5538 YYLTYPE loc
= this->get_location();
5539 _mesa_glsl_error(&loc
, state
,
5540 "declaration of function `%s' not allowed within "
5541 "function body", name
);
5544 validate_identifier(name
, this->get_location(), state
);
5546 /* Convert the list of function parameters to HIR now so that they can be
5547 * used below to compare this function's signature with previously seen
5548 * signatures for functions with the same name.
5550 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5552 & hir_parameters
, state
);
5554 const char *return_type_name
;
5555 const glsl_type
*return_type
=
5556 this->return_type
->glsl_type(& return_type_name
, state
);
5559 YYLTYPE loc
= this->get_location();
5560 _mesa_glsl_error(&loc
, state
,
5561 "function `%s' has undeclared return type `%s'",
5562 name
, return_type_name
);
5563 return_type
= glsl_type::error_type
;
5566 /* ARB_shader_subroutine states:
5567 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5568 * subroutine(...) to a function declaration."
5570 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
5571 YYLTYPE loc
= this->get_location();
5572 _mesa_glsl_error(&loc
, state
,
5573 "function declaration `%s' cannot have subroutine prepended",
5577 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5578 * "No qualifier is allowed on the return type of a function."
5580 if (this->return_type
->has_qualifiers(state
)) {
5581 YYLTYPE loc
= this->get_location();
5582 _mesa_glsl_error(& loc
, state
,
5583 "function `%s' return type has qualifiers", name
);
5586 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5588 * "Arrays are allowed as arguments and as the return type. In both
5589 * cases, the array must be explicitly sized."
5591 if (return_type
->is_unsized_array()) {
5592 YYLTYPE loc
= this->get_location();
5593 _mesa_glsl_error(& loc
, state
,
5594 "function `%s' return type array must be explicitly "
5598 /* From section 4.1.7 of the GLSL 4.40 spec:
5600 * "[Opaque types] can only be declared as function parameters
5601 * or uniform-qualified variables."
5603 if (return_type
->contains_opaque()) {
5604 YYLTYPE loc
= this->get_location();
5605 _mesa_glsl_error(&loc
, state
,
5606 "function `%s' return type can't contain an opaque type",
5611 if (return_type
->is_subroutine()) {
5612 YYLTYPE loc
= this->get_location();
5613 _mesa_glsl_error(&loc
, state
,
5614 "function `%s' return type can't be a subroutine type",
5619 /* Create an ir_function if one doesn't already exist. */
5620 f
= state
->symbols
->get_function(name
);
5622 f
= new(ctx
) ir_function(name
);
5623 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
5624 if (!state
->symbols
->add_function(f
)) {
5625 /* This function name shadows a non-function use of the same name. */
5626 YYLTYPE loc
= this->get_location();
5627 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5628 "non-function", name
);
5632 emit_function(state
, f
);
5635 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5637 * "A shader cannot redefine or overload built-in functions."
5639 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5641 * "User code can overload the built-in functions but cannot redefine
5644 if (state
->es_shader
&& state
->language_version
>= 300) {
5645 /* Local shader has no exact candidates; check the built-ins. */
5646 _mesa_glsl_initialize_builtin_functions();
5647 if (_mesa_glsl_find_builtin_function_by_name(name
)) {
5648 YYLTYPE loc
= this->get_location();
5649 _mesa_glsl_error(& loc
, state
,
5650 "A shader cannot redefine or overload built-in "
5651 "function `%s' in GLSL ES 3.00", name
);
5656 /* Verify that this function's signature either doesn't match a previously
5657 * seen signature for a function with the same name, or, if a match is found,
5658 * that the previously seen signature does not have an associated definition.
5660 if (state
->es_shader
|| f
->has_user_signature()) {
5661 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5663 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5664 if (badvar
!= NULL
) {
5665 YYLTYPE loc
= this->get_location();
5667 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5668 "qualifiers don't match prototype", name
, badvar
);
5671 if (sig
->return_type
!= return_type
) {
5672 YYLTYPE loc
= this->get_location();
5674 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5675 "match prototype", name
);
5678 if (sig
->is_defined
) {
5679 if (is_definition
) {
5680 YYLTYPE loc
= this->get_location();
5681 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5683 /* We just encountered a prototype that exactly matches a
5684 * function that's already been defined. This is redundant,
5685 * and we should ignore it.
5693 /* Verify the return type of main() */
5694 if (strcmp(name
, "main") == 0) {
5695 if (! return_type
->is_void()) {
5696 YYLTYPE loc
= this->get_location();
5698 _mesa_glsl_error(& loc
, state
, "main() must return void");
5701 if (!hir_parameters
.is_empty()) {
5702 YYLTYPE loc
= this->get_location();
5704 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5708 /* Finish storing the information about this new function in its signature.
5711 sig
= new(ctx
) ir_function_signature(return_type
);
5712 f
->add_signature(sig
);
5715 sig
->replace_parameters(&hir_parameters
);
5718 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
5721 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5722 unsigned qual_index
;
5723 if (process_qualifier_constant(state
, &loc
, "index",
5724 this->return_type
->qualifier
.index
,
5726 if (!state
->has_explicit_uniform_location()) {
5727 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5728 "GL_ARB_explicit_uniform_location or "
5730 } else if (qual_index
>= MAX_SUBROUTINES
) {
5731 _mesa_glsl_error(&loc
, state
,
5732 "invalid subroutine index (%d) index must "
5733 "be a number between 0 and "
5734 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5735 MAX_SUBROUTINES
- 1);
5737 f
->subroutine_index
= qual_index
;
5742 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5743 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5744 f
->num_subroutine_types
);
5746 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5747 const struct glsl_type
*type
;
5748 /* the subroutine type must be already declared */
5749 type
= state
->symbols
->get_type(decl
->identifier
);
5751 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5754 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5755 ir_function
*fn
= state
->subroutine_types
[i
];
5756 ir_function_signature
*tsig
= NULL
;
5758 if (strcmp(fn
->name
, decl
->identifier
))
5761 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5764 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5766 if (tsig
->return_type
!= sig
->return_type
) {
5767 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5771 f
->subroutine_types
[idx
++] = type
;
5773 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5775 state
->num_subroutines
+ 1);
5776 state
->subroutines
[state
->num_subroutines
] = f
;
5777 state
->num_subroutines
++;
5781 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
5782 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5783 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5786 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5788 state
->num_subroutine_types
+ 1);
5789 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5790 state
->num_subroutine_types
++;
5792 f
->is_subroutine
= true;
5795 /* Function declarations (prototypes) do not have r-values.
5802 ast_function_definition::hir(exec_list
*instructions
,
5803 struct _mesa_glsl_parse_state
*state
)
5805 prototype
->is_definition
= true;
5806 prototype
->hir(instructions
, state
);
5808 ir_function_signature
*signature
= prototype
->signature
;
5809 if (signature
== NULL
)
5812 assert(state
->current_function
== NULL
);
5813 state
->current_function
= signature
;
5814 state
->found_return
= false;
5816 /* Duplicate parameters declared in the prototype as concrete variables.
5817 * Add these to the symbol table.
5819 state
->symbols
->push_scope();
5820 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5821 assert(var
->as_variable() != NULL
);
5823 /* The only way a parameter would "exist" is if two parameters have
5826 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5827 YYLTYPE loc
= this->get_location();
5829 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5831 state
->symbols
->add_variable(var
);
5835 /* Convert the body of the function to HIR. */
5836 this->body
->hir(&signature
->body
, state
);
5837 signature
->is_defined
= true;
5839 state
->symbols
->pop_scope();
5841 assert(state
->current_function
== signature
);
5842 state
->current_function
= NULL
;
5844 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5845 YYLTYPE loc
= this->get_location();
5846 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5847 "%s, but no return statement",
5848 signature
->function_name(),
5849 signature
->return_type
->name
);
5852 /* Function definitions do not have r-values.
5859 ast_jump_statement::hir(exec_list
*instructions
,
5860 struct _mesa_glsl_parse_state
*state
)
5867 assert(state
->current_function
);
5869 if (opt_return_value
) {
5870 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5872 /* The value of the return type can be NULL if the shader says
5873 * 'return foo();' and foo() is a function that returns void.
5875 * NOTE: The GLSL spec doesn't say that this is an error. The type
5876 * of the return value is void. If the return type of the function is
5877 * also void, then this should compile without error. Seriously.
5879 const glsl_type
*const ret_type
=
5880 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5882 /* Implicit conversions are not allowed for return values prior to
5883 * ARB_shading_language_420pack.
5885 if (state
->current_function
->return_type
!= ret_type
) {
5886 YYLTYPE loc
= this->get_location();
5888 if (state
->has_420pack()) {
5889 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5891 _mesa_glsl_error(& loc
, state
,
5892 "could not implicitly convert return value "
5893 "to %s, in function `%s'",
5894 state
->current_function
->return_type
->name
,
5895 state
->current_function
->function_name());
5898 _mesa_glsl_error(& loc
, state
,
5899 "`return' with wrong type %s, in function `%s' "
5902 state
->current_function
->function_name(),
5903 state
->current_function
->return_type
->name
);
5905 } else if (state
->current_function
->return_type
->base_type
==
5907 YYLTYPE loc
= this->get_location();
5909 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5910 * specs add a clarification:
5912 * "A void function can only use return without a return argument, even if
5913 * the return argument has void type. Return statements only accept values:
5916 * void func2() { return func1(); } // illegal return statement"
5918 _mesa_glsl_error(& loc
, state
,
5919 "void functions can only use `return' without a "
5923 inst
= new(ctx
) ir_return(ret
);
5925 if (state
->current_function
->return_type
->base_type
!=
5927 YYLTYPE loc
= this->get_location();
5929 _mesa_glsl_error(& loc
, state
,
5930 "`return' with no value, in function %s returning "
5932 state
->current_function
->function_name());
5934 inst
= new(ctx
) ir_return
;
5937 state
->found_return
= true;
5938 instructions
->push_tail(inst
);
5943 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5944 YYLTYPE loc
= this->get_location();
5946 _mesa_glsl_error(& loc
, state
,
5947 "`discard' may only appear in a fragment shader");
5949 instructions
->push_tail(new(ctx
) ir_discard
);
5954 if (mode
== ast_continue
&&
5955 state
->loop_nesting_ast
== NULL
) {
5956 YYLTYPE loc
= this->get_location();
5958 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5959 } else if (mode
== ast_break
&&
5960 state
->loop_nesting_ast
== NULL
&&
5961 state
->switch_state
.switch_nesting_ast
== NULL
) {
5962 YYLTYPE loc
= this->get_location();
5964 _mesa_glsl_error(& loc
, state
,
5965 "break may only appear in a loop or a switch");
5967 /* For a loop, inline the for loop expression again, since we don't
5968 * know where near the end of the loop body the normal copy of it is
5969 * going to be placed. Same goes for the condition for a do-while
5972 if (state
->loop_nesting_ast
!= NULL
&&
5973 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5974 if (state
->loop_nesting_ast
->rest_expression
) {
5975 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5978 if (state
->loop_nesting_ast
->mode
==
5979 ast_iteration_statement::ast_do_while
) {
5980 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
5984 if (state
->switch_state
.is_switch_innermost
&&
5985 mode
== ast_continue
) {
5986 /* Set 'continue_inside' to true. */
5987 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
5988 ir_dereference_variable
*deref_continue_inside_var
=
5989 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5990 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5993 /* Break out from the switch, continue for the loop will
5994 * be called right after switch. */
5995 ir_loop_jump
*const jump
=
5996 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5997 instructions
->push_tail(jump
);
5999 } else if (state
->switch_state
.is_switch_innermost
&&
6000 mode
== ast_break
) {
6001 /* Force break out of switch by inserting a break. */
6002 ir_loop_jump
*const jump
=
6003 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6004 instructions
->push_tail(jump
);
6006 ir_loop_jump
*const jump
=
6007 new(ctx
) ir_loop_jump((mode
== ast_break
)
6008 ? ir_loop_jump::jump_break
6009 : ir_loop_jump::jump_continue
);
6010 instructions
->push_tail(jump
);
6017 /* Jump instructions do not have r-values.
6024 ast_selection_statement::hir(exec_list
*instructions
,
6025 struct _mesa_glsl_parse_state
*state
)
6029 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6031 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6033 * "Any expression whose type evaluates to a Boolean can be used as the
6034 * conditional expression bool-expression. Vector types are not accepted
6035 * as the expression to if."
6037 * The checks are separated so that higher quality diagnostics can be
6038 * generated for cases where both rules are violated.
6040 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6041 YYLTYPE loc
= this->condition
->get_location();
6043 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6047 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6049 if (then_statement
!= NULL
) {
6050 state
->symbols
->push_scope();
6051 then_statement
->hir(& stmt
->then_instructions
, state
);
6052 state
->symbols
->pop_scope();
6055 if (else_statement
!= NULL
) {
6056 state
->symbols
->push_scope();
6057 else_statement
->hir(& stmt
->else_instructions
, state
);
6058 state
->symbols
->pop_scope();
6061 instructions
->push_tail(stmt
);
6063 /* if-statements do not have r-values.
6069 /* Used for detection of duplicate case values, compare
6070 * given contents directly.
6073 compare_case_value(const void *a
, const void *b
)
6075 return *(unsigned *) a
== *(unsigned *) b
;
6079 /* Used for detection of duplicate case values, just
6080 * returns key contents as is.
6083 key_contents(const void *key
)
6085 return *(unsigned *) key
;
6090 ast_switch_statement::hir(exec_list
*instructions
,
6091 struct _mesa_glsl_parse_state
*state
)
6095 ir_rvalue
*const test_expression
=
6096 this->test_expression
->hir(instructions
, state
);
6098 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6100 * "The type of init-expression in a switch statement must be a
6103 if (!test_expression
->type
->is_scalar() ||
6104 !test_expression
->type
->is_integer()) {
6105 YYLTYPE loc
= this->test_expression
->get_location();
6107 _mesa_glsl_error(& loc
,
6109 "switch-statement expression must be scalar "
6113 /* Track the switch-statement nesting in a stack-like manner.
6115 struct glsl_switch_state saved
= state
->switch_state
;
6117 state
->switch_state
.is_switch_innermost
= true;
6118 state
->switch_state
.switch_nesting_ast
= this;
6119 state
->switch_state
.labels_ht
=
6120 _mesa_hash_table_create(NULL
, key_contents
,
6121 compare_case_value
);
6122 state
->switch_state
.previous_default
= NULL
;
6124 /* Initalize is_fallthru state to false.
6126 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6127 state
->switch_state
.is_fallthru_var
=
6128 new(ctx
) ir_variable(glsl_type::bool_type
,
6129 "switch_is_fallthru_tmp",
6131 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6133 ir_dereference_variable
*deref_is_fallthru_var
=
6134 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6135 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6138 /* Initialize continue_inside state to false.
6140 state
->switch_state
.continue_inside
=
6141 new(ctx
) ir_variable(glsl_type::bool_type
,
6142 "continue_inside_tmp",
6144 instructions
->push_tail(state
->switch_state
.continue_inside
);
6146 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6147 ir_dereference_variable
*deref_continue_inside_var
=
6148 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6149 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6152 state
->switch_state
.run_default
=
6153 new(ctx
) ir_variable(glsl_type::bool_type
,
6156 instructions
->push_tail(state
->switch_state
.run_default
);
6158 /* Loop around the switch is used for flow control. */
6159 ir_loop
* loop
= new(ctx
) ir_loop();
6160 instructions
->push_tail(loop
);
6162 /* Cache test expression.
6164 test_to_hir(&loop
->body_instructions
, state
);
6166 /* Emit code for body of switch stmt.
6168 body
->hir(&loop
->body_instructions
, state
);
6170 /* Insert a break at the end to exit loop. */
6171 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6172 loop
->body_instructions
.push_tail(jump
);
6174 /* If we are inside loop, check if continue got called inside switch. */
6175 if (state
->loop_nesting_ast
!= NULL
) {
6176 ir_dereference_variable
*deref_continue_inside
=
6177 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6178 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6179 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6181 if (state
->loop_nesting_ast
!= NULL
) {
6182 if (state
->loop_nesting_ast
->rest_expression
) {
6183 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6186 if (state
->loop_nesting_ast
->mode
==
6187 ast_iteration_statement::ast_do_while
) {
6188 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6191 irif
->then_instructions
.push_tail(jump
);
6192 instructions
->push_tail(irif
);
6195 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6197 state
->switch_state
= saved
;
6199 /* Switch statements do not have r-values. */
6205 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6206 struct _mesa_glsl_parse_state
*state
)
6210 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6211 * on the switch test case. The first one would be already raised when
6212 * getting the test_expression at ast_switch_statement::hir
6214 test_expression
->set_is_lhs(true);
6215 /* Cache value of test expression. */
6216 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6218 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6221 ir_dereference_variable
*deref_test_var
=
6222 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6224 instructions
->push_tail(state
->switch_state
.test_var
);
6225 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6230 ast_switch_body::hir(exec_list
*instructions
,
6231 struct _mesa_glsl_parse_state
*state
)
6234 stmts
->hir(instructions
, state
);
6236 /* Switch bodies do not have r-values. */
6241 ast_case_statement_list::hir(exec_list
*instructions
,
6242 struct _mesa_glsl_parse_state
*state
)
6244 exec_list default_case
, after_default
, tmp
;
6246 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6247 case_stmt
->hir(&tmp
, state
);
6250 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6251 default_case
.append_list(&tmp
);
6255 /* If default case found, append 'after_default' list. */
6256 if (!default_case
.is_empty())
6257 after_default
.append_list(&tmp
);
6259 instructions
->append_list(&tmp
);
6262 /* Handle the default case. This is done here because default might not be
6263 * the last case. We need to add checks against following cases first to see
6264 * if default should be chosen or not.
6266 if (!default_case
.is_empty()) {
6268 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6269 ir_dereference_variable
*deref_run_default_var
=
6270 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6272 /* Choose to run default case initially, following conditional
6273 * assignments might change this.
6275 ir_assignment
*const init_var
=
6276 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6277 instructions
->push_tail(init_var
);
6279 /* Default case was the last one, no checks required. */
6280 if (after_default
.is_empty()) {
6281 instructions
->append_list(&default_case
);
6285 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6286 ir_assignment
*assign
= ir
->as_assignment();
6291 /* Clone the check between case label and init expression. */
6292 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6293 ir_expression
*clone
= exp
->clone(state
, NULL
);
6295 ir_dereference_variable
*deref_var
=
6296 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6297 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6299 ir_assignment
*const set_false
=
6300 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6302 instructions
->push_tail(set_false
);
6305 /* Append default case and all cases after it. */
6306 instructions
->append_list(&default_case
);
6307 instructions
->append_list(&after_default
);
6310 /* Case statements do not have r-values. */
6315 ast_case_statement::hir(exec_list
*instructions
,
6316 struct _mesa_glsl_parse_state
*state
)
6318 labels
->hir(instructions
, state
);
6320 /* Guard case statements depending on fallthru state. */
6321 ir_dereference_variable
*const deref_fallthru_guard
=
6322 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6323 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6325 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6326 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6328 instructions
->push_tail(test_fallthru
);
6330 /* Case statements do not have r-values. */
6336 ast_case_label_list::hir(exec_list
*instructions
,
6337 struct _mesa_glsl_parse_state
*state
)
6339 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6340 label
->hir(instructions
, state
);
6342 /* Case labels do not have r-values. */
6347 ast_case_label::hir(exec_list
*instructions
,
6348 struct _mesa_glsl_parse_state
*state
)
6352 ir_dereference_variable
*deref_fallthru_var
=
6353 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6355 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6357 /* If not default case, ... */
6358 if (this->test_value
!= NULL
) {
6359 /* Conditionally set fallthru state based on
6360 * comparison of cached test expression value to case label.
6362 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6363 ir_constant
*label_const
= label_rval
->constant_expression_value();
6366 YYLTYPE loc
= this->test_value
->get_location();
6368 _mesa_glsl_error(& loc
, state
,
6369 "switch statement case label must be a "
6370 "constant expression");
6372 /* Stuff a dummy value in to allow processing to continue. */
6373 label_const
= new(ctx
) ir_constant(0);
6376 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6377 (void *)(uintptr_t)&label_const
->value
.u
[0]);
6380 ast_expression
*previous_label
= (ast_expression
*) entry
->data
;
6381 YYLTYPE loc
= this->test_value
->get_location();
6382 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6384 loc
= previous_label
->get_location();
6385 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6387 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6388 (void *)(uintptr_t)&label_const
->value
.u
[0],
6393 ir_dereference_variable
*deref_test_var
=
6394 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6396 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6401 * From GLSL 4.40 specification section 6.2 ("Selection"):
6403 * "The type of the init-expression value in a switch statement must
6404 * be a scalar int or uint. The type of the constant-expression value
6405 * in a case label also must be a scalar int or uint. When any pair
6406 * of these values is tested for "equal value" and the types do not
6407 * match, an implicit conversion will be done to convert the int to a
6408 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6411 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6412 YYLTYPE loc
= this->test_value
->get_location();
6414 const glsl_type
*type_a
= label_const
->type
;
6415 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6417 /* Check if int->uint implicit conversion is supported. */
6418 bool integer_conversion_supported
=
6419 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6422 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6423 !integer_conversion_supported
) {
6424 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6425 "init-expression and case label (%s != %s)",
6426 type_a
->name
, type_b
->name
);
6428 /* Conversion of the case label. */
6429 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6430 if (!apply_implicit_conversion(glsl_type::uint_type
,
6431 test_cond
->operands
[0], state
))
6432 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6434 /* Conversion of the init-expression value. */
6435 if (!apply_implicit_conversion(glsl_type::uint_type
,
6436 test_cond
->operands
[1], state
))
6437 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6442 ir_assignment
*set_fallthru_on_test
=
6443 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6445 instructions
->push_tail(set_fallthru_on_test
);
6446 } else { /* default case */
6447 if (state
->switch_state
.previous_default
) {
6448 YYLTYPE loc
= this->get_location();
6449 _mesa_glsl_error(& loc
, state
,
6450 "multiple default labels in one switch");
6452 loc
= state
->switch_state
.previous_default
->get_location();
6453 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6455 state
->switch_state
.previous_default
= this;
6457 /* Set fallthru condition on 'run_default' bool. */
6458 ir_dereference_variable
*deref_run_default
=
6459 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6460 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6461 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6465 /* Set falltrhu state. */
6466 ir_assignment
*set_fallthru
=
6467 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6469 instructions
->push_tail(set_fallthru
);
6472 /* Case statements do not have r-values. */
6477 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6478 struct _mesa_glsl_parse_state
*state
)
6482 if (condition
!= NULL
) {
6483 ir_rvalue
*const cond
=
6484 condition
->hir(instructions
, state
);
6487 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6488 YYLTYPE loc
= condition
->get_location();
6490 _mesa_glsl_error(& loc
, state
,
6491 "loop condition must be scalar boolean");
6493 /* As the first code in the loop body, generate a block that looks
6494 * like 'if (!condition) break;' as the loop termination condition.
6496 ir_rvalue
*const not_cond
=
6497 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6499 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6501 ir_jump
*const break_stmt
=
6502 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6504 if_stmt
->then_instructions
.push_tail(break_stmt
);
6505 instructions
->push_tail(if_stmt
);
6512 ast_iteration_statement::hir(exec_list
*instructions
,
6513 struct _mesa_glsl_parse_state
*state
)
6517 /* For-loops and while-loops start a new scope, but do-while loops do not.
6519 if (mode
!= ast_do_while
)
6520 state
->symbols
->push_scope();
6522 if (init_statement
!= NULL
)
6523 init_statement
->hir(instructions
, state
);
6525 ir_loop
*const stmt
= new(ctx
) ir_loop();
6526 instructions
->push_tail(stmt
);
6528 /* Track the current loop nesting. */
6529 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6531 state
->loop_nesting_ast
= this;
6533 /* Likewise, indicate that following code is closest to a loop,
6534 * NOT closest to a switch.
6536 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6537 state
->switch_state
.is_switch_innermost
= false;
6539 if (mode
!= ast_do_while
)
6540 condition_to_hir(&stmt
->body_instructions
, state
);
6543 body
->hir(& stmt
->body_instructions
, state
);
6545 if (rest_expression
!= NULL
)
6546 rest_expression
->hir(& stmt
->body_instructions
, state
);
6548 if (mode
== ast_do_while
)
6549 condition_to_hir(&stmt
->body_instructions
, state
);
6551 if (mode
!= ast_do_while
)
6552 state
->symbols
->pop_scope();
6554 /* Restore previous nesting before returning. */
6555 state
->loop_nesting_ast
= nesting_ast
;
6556 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6558 /* Loops do not have r-values.
6565 * Determine if the given type is valid for establishing a default precision
6568 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6570 * "The precision statement
6572 * precision precision-qualifier type;
6574 * can be used to establish a default precision qualifier. The type field
6575 * can be either int or float or any of the sampler types, and the
6576 * precision-qualifier can be lowp, mediump, or highp."
6578 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6579 * qualifiers on sampler types, but this seems like an oversight (since the
6580 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6581 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6585 is_valid_default_precision_type(const struct glsl_type
*const type
)
6590 switch (type
->base_type
) {
6592 case GLSL_TYPE_FLOAT
:
6593 /* "int" and "float" are valid, but vectors and matrices are not. */
6594 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6595 case GLSL_TYPE_SAMPLER
:
6596 case GLSL_TYPE_IMAGE
:
6597 case GLSL_TYPE_ATOMIC_UINT
:
6606 ast_type_specifier::hir(exec_list
*instructions
,
6607 struct _mesa_glsl_parse_state
*state
)
6609 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6612 YYLTYPE loc
= this->get_location();
6614 /* If this is a precision statement, check that the type to which it is
6615 * applied is either float or int.
6617 * From section 4.5.3 of the GLSL 1.30 spec:
6618 * "The precision statement
6619 * precision precision-qualifier type;
6620 * can be used to establish a default precision qualifier. The type
6621 * field can be either int or float [...]. Any other types or
6622 * qualifiers will result in an error.
6624 if (this->default_precision
!= ast_precision_none
) {
6625 if (!state
->check_precision_qualifiers_allowed(&loc
))
6628 if (this->structure
!= NULL
) {
6629 _mesa_glsl_error(&loc
, state
,
6630 "precision qualifiers do not apply to structures");
6634 if (this->array_specifier
!= NULL
) {
6635 _mesa_glsl_error(&loc
, state
,
6636 "default precision statements do not apply to "
6641 const struct glsl_type
*const type
=
6642 state
->symbols
->get_type(this->type_name
);
6643 if (!is_valid_default_precision_type(type
)) {
6644 _mesa_glsl_error(&loc
, state
,
6645 "default precision statements apply only to "
6646 "float, int, and opaque types");
6650 if (state
->es_shader
) {
6651 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6654 * "Non-precision qualified declarations will use the precision
6655 * qualifier specified in the most recent precision statement
6656 * that is still in scope. The precision statement has the same
6657 * scoping rules as variable declarations. If it is declared
6658 * inside a compound statement, its effect stops at the end of
6659 * the innermost statement it was declared in. Precision
6660 * statements in nested scopes override precision statements in
6661 * outer scopes. Multiple precision statements for the same basic
6662 * type can appear inside the same scope, with later statements
6663 * overriding earlier statements within that scope."
6665 * Default precision specifications follow the same scope rules as
6666 * variables. So, we can track the state of the default precision
6667 * qualifiers in the symbol table, and the rules will just work. This
6668 * is a slight abuse of the symbol table, but it has the semantics
6671 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6672 this->default_precision
);
6675 /* FINISHME: Translate precision statements into IR. */
6679 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6680 * process_record_constructor() can do type-checking on C-style initializer
6681 * expressions of structs, but ast_struct_specifier should only be translated
6682 * to HIR if it is declaring the type of a structure.
6684 * The ->is_declaration field is false for initializers of variables
6685 * declared separately from the struct's type definition.
6687 * struct S { ... }; (is_declaration = true)
6688 * struct T { ... } t = { ... }; (is_declaration = true)
6689 * S s = { ... }; (is_declaration = false)
6691 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6692 return this->structure
->hir(instructions
, state
);
6699 * Process a structure or interface block tree into an array of structure fields
6701 * After parsing, where there are some syntax differnces, structures and
6702 * interface blocks are almost identical. They are similar enough that the
6703 * AST for each can be processed the same way into a set of
6704 * \c glsl_struct_field to describe the members.
6706 * If we're processing an interface block, var_mode should be the type of the
6707 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6708 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6712 * The number of fields processed. A pointer to the array structure fields is
6713 * stored in \c *fields_ret.
6716 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6717 struct _mesa_glsl_parse_state
*state
,
6718 exec_list
*declarations
,
6719 glsl_struct_field
**fields_ret
,
6721 enum glsl_matrix_layout matrix_layout
,
6722 bool allow_reserved_names
,
6723 ir_variable_mode var_mode
,
6724 ast_type_qualifier
*layout
,
6725 unsigned block_stream
,
6726 unsigned block_xfb_buffer
,
6727 unsigned block_xfb_offset
,
6728 unsigned expl_location
,
6729 unsigned expl_align
)
6731 unsigned decl_count
= 0;
6732 unsigned next_offset
= 0;
6734 /* Make an initial pass over the list of fields to determine how
6735 * many there are. Each element in this list is an ast_declarator_list.
6736 * This means that we actually need to count the number of elements in the
6737 * 'declarations' list in each of the elements.
6739 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6740 decl_count
+= decl_list
->declarations
.length();
6743 /* Allocate storage for the fields and process the field
6744 * declarations. As the declarations are processed, try to also convert
6745 * the types to HIR. This ensures that structure definitions embedded in
6746 * other structure definitions or in interface blocks are processed.
6748 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
6751 bool first_member
= true;
6752 bool first_member_has_explicit_location
= false;
6755 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6756 const char *type_name
;
6757 YYLTYPE loc
= decl_list
->get_location();
6759 decl_list
->type
->specifier
->hir(instructions
, state
);
6761 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6763 * "Anonymous structures are not supported; so embedded structures
6764 * must have a declarator. A name given to an embedded struct is
6765 * scoped at the same level as the struct it is embedded in."
6767 * The same section of the GLSL 1.20 spec says:
6769 * "Anonymous structures are not supported. Embedded structures are
6772 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6773 * embedded structures in 1.10 only.
6775 if (state
->language_version
!= 110 &&
6776 decl_list
->type
->specifier
->structure
!= NULL
)
6777 _mesa_glsl_error(&loc
, state
,
6778 "embedded structure declarations are not allowed");
6780 const glsl_type
*decl_type
=
6781 decl_list
->type
->glsl_type(& type_name
, state
);
6783 const struct ast_type_qualifier
*const qual
=
6784 &decl_list
->type
->qualifier
;
6786 /* From section 4.3.9 of the GLSL 4.40 spec:
6788 * "[In interface blocks] opaque types are not allowed."
6790 * It should be impossible for decl_type to be NULL here. Cases that
6791 * might naturally lead to decl_type being NULL, especially for the
6792 * is_interface case, will have resulted in compilation having
6793 * already halted due to a syntax error.
6798 if (decl_type
->contains_opaque()) {
6799 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6800 "interface block contains opaque variable");
6803 if (decl_type
->contains_atomic()) {
6804 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6806 * "Members of structures cannot be declared as atomic counter
6809 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6812 if (decl_type
->contains_image()) {
6813 /* FINISHME: Same problem as with atomic counters.
6814 * FINISHME: Request clarification from Khronos and add
6815 * FINISHME: spec quotation here.
6817 _mesa_glsl_error(&loc
, state
, "image in structure");
6821 if (qual
->flags
.q
.explicit_binding
) {
6822 _mesa_glsl_error(&loc
, state
,
6823 "binding layout qualifier cannot be applied "
6824 "to struct or interface block members");
6828 if (!first_member
) {
6829 if (!layout
->flags
.q
.explicit_location
&&
6830 ((first_member_has_explicit_location
&&
6831 !qual
->flags
.q
.explicit_location
) ||
6832 (!first_member_has_explicit_location
&&
6833 qual
->flags
.q
.explicit_location
))) {
6834 _mesa_glsl_error(&loc
, state
,
6835 "when block-level location layout qualifier "
6836 "is not supplied either all members must "
6837 "have a location layout qualifier or all "
6838 "members must not have a location layout "
6842 first_member
= false;
6843 first_member_has_explicit_location
=
6844 qual
->flags
.q
.explicit_location
;
6848 if (qual
->flags
.q
.std140
||
6849 qual
->flags
.q
.std430
||
6850 qual
->flags
.q
.packed
||
6851 qual
->flags
.q
.shared
) {
6852 _mesa_glsl_error(&loc
, state
,
6853 "uniform/shader storage block layout qualifiers "
6854 "std140, std430, packed, and shared can only be "
6855 "applied to uniform/shader storage blocks, not "
6859 if (qual
->flags
.q
.constant
) {
6860 _mesa_glsl_error(&loc
, state
,
6861 "const storage qualifier cannot be applied "
6862 "to struct or interface block members");
6865 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6867 * "A block member may be declared with a stream identifier, but
6868 * the specified stream must match the stream associated with the
6869 * containing block."
6871 if (qual
->flags
.q
.explicit_stream
) {
6872 unsigned qual_stream
;
6873 if (process_qualifier_constant(state
, &loc
, "stream",
6874 qual
->stream
, &qual_stream
) &&
6875 qual_stream
!= block_stream
) {
6876 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6877 "interface block member does not match "
6878 "the interface block (%u vs %u)", qual_stream
,
6884 unsigned explicit_xfb_buffer
= 0;
6885 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6886 unsigned qual_xfb_buffer
;
6887 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6888 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6889 explicit_xfb_buffer
= 1;
6890 if (qual_xfb_buffer
!= block_xfb_buffer
)
6891 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6892 "interface block member does not match "
6893 "the interface block (%u vs %u)",
6894 qual_xfb_buffer
, block_xfb_buffer
);
6896 xfb_buffer
= (int) qual_xfb_buffer
;
6899 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
6900 xfb_buffer
= (int) block_xfb_buffer
;
6903 int xfb_stride
= -1;
6904 if (qual
->flags
.q
.explicit_xfb_stride
) {
6905 unsigned qual_xfb_stride
;
6906 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6907 qual
->xfb_stride
, &qual_xfb_stride
)) {
6908 xfb_stride
= (int) qual_xfb_stride
;
6912 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6913 _mesa_glsl_error(&loc
, state
,
6914 "interpolation qualifiers cannot be used "
6915 "with uniform interface blocks");
6918 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6919 qual
->has_auxiliary_storage()) {
6920 _mesa_glsl_error(&loc
, state
,
6921 "auxiliary storage qualifiers cannot be used "
6922 "in uniform blocks or structures.");
6925 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6926 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6927 _mesa_glsl_error(&loc
, state
,
6928 "row_major and column_major can only be "
6929 "applied to interface blocks");
6931 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6934 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6935 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6936 "readonly and writeonly.");
6939 foreach_list_typed (ast_declaration
, decl
, link
,
6940 &decl_list
->declarations
) {
6941 YYLTYPE loc
= decl
->get_location();
6943 if (!allow_reserved_names
)
6944 validate_identifier(decl
->identifier
, loc
, state
);
6946 const struct glsl_type
*field_type
=
6947 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6948 validate_array_dimensions(field_type
, state
, &loc
);
6949 fields
[i
].type
= field_type
;
6950 fields
[i
].name
= decl
->identifier
;
6951 fields
[i
].interpolation
=
6952 interpret_interpolation_qualifier(qual
, field_type
,
6953 var_mode
, state
, &loc
);
6954 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6955 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6956 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6957 fields
[i
].precision
= qual
->precision
;
6958 fields
[i
].offset
= -1;
6959 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6960 fields
[i
].xfb_buffer
= xfb_buffer
;
6961 fields
[i
].xfb_stride
= xfb_stride
;
6963 if (qual
->flags
.q
.explicit_location
) {
6964 unsigned qual_location
;
6965 if (process_qualifier_constant(state
, &loc
, "location",
6966 qual
->location
, &qual_location
)) {
6967 fields
[i
].location
= qual_location
+
6968 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
6969 expl_location
= fields
[i
].location
+
6970 fields
[i
].type
->count_attribute_slots(false);
6973 if (layout
&& layout
->flags
.q
.explicit_location
) {
6974 fields
[i
].location
= expl_location
;
6975 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6977 fields
[i
].location
= -1;
6981 /* Offset can only be used with std430 and std140 layouts an initial
6982 * value of 0 is used for error detection.
6988 if (qual
->flags
.q
.row_major
||
6989 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
6995 if(layout
->flags
.q
.std140
) {
6996 align
= field_type
->std140_base_alignment(row_major
);
6997 size
= field_type
->std140_size(row_major
);
6998 } else if (layout
->flags
.q
.std430
) {
6999 align
= field_type
->std430_base_alignment(row_major
);
7000 size
= field_type
->std430_size(row_major
);
7004 if (qual
->flags
.q
.explicit_offset
) {
7005 unsigned qual_offset
;
7006 if (process_qualifier_constant(state
, &loc
, "offset",
7007 qual
->offset
, &qual_offset
)) {
7008 if (align
!= 0 && size
!= 0) {
7009 if (next_offset
> qual_offset
)
7010 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7011 "offset overlaps previous member");
7013 if (qual_offset
% align
) {
7014 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7015 "must be a multiple of the base "
7016 "alignment of %s", field_type
->name
);
7018 fields
[i
].offset
= qual_offset
;
7019 next_offset
= glsl_align(qual_offset
+ size
, align
);
7021 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7022 "with std430 and std140 layouts");
7027 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7028 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7030 if (align
== 0 || size
== 0) {
7031 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7032 "std430 and std140 layouts");
7033 } else if (qual
->flags
.q
.explicit_align
) {
7034 unsigned member_align
;
7035 if (process_qualifier_constant(state
, &loc
, "align",
7036 qual
->align
, &member_align
)) {
7037 if (member_align
== 0 ||
7038 member_align
& (member_align
- 1)) {
7039 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7040 "in not a power of 2");
7042 fields
[i
].offset
= glsl_align(offset
, member_align
);
7043 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7047 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7048 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7050 } else if (!qual
->flags
.q
.explicit_offset
) {
7051 if (align
!= 0 && size
!= 0)
7052 next_offset
= glsl_align(next_offset
+ size
, align
);
7055 /* From the ARB_enhanced_layouts spec:
7057 * "The given offset applies to the first component of the first
7058 * member of the qualified entity. Then, within the qualified
7059 * entity, subsequent components are each assigned, in order, to
7060 * the next available offset aligned to a multiple of that
7061 * component's size. Aggregate types are flattened down to the
7062 * component level to get this sequence of components."
7064 if (qual
->flags
.q
.explicit_xfb_offset
) {
7065 unsigned xfb_offset
;
7066 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7067 qual
->offset
, &xfb_offset
)) {
7068 fields
[i
].offset
= xfb_offset
;
7069 block_xfb_offset
= fields
[i
].offset
+
7070 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
7073 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7074 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7075 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7077 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
7081 /* Propogate row- / column-major information down the fields of the
7082 * structure or interface block. Structures need this data because
7083 * the structure may contain a structure that contains ... a matrix
7084 * that need the proper layout.
7086 if (is_interface
&& layout
&&
7087 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7088 (field_type
->without_array()->is_matrix()
7089 || field_type
->without_array()->is_record())) {
7090 /* If no layout is specified for the field, inherit the layout
7093 fields
[i
].matrix_layout
= matrix_layout
;
7095 if (qual
->flags
.q
.row_major
)
7096 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7097 else if (qual
->flags
.q
.column_major
)
7098 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7100 /* If we're processing an uniform or buffer block, the matrix
7101 * layout must be decided by this point.
7103 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7104 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7107 /* Image qualifiers are allowed on buffer variables, which can only
7108 * be defined inside shader storage buffer objects
7110 if (layout
&& var_mode
== ir_var_shader_storage
) {
7111 /* For readonly and writeonly qualifiers the field definition,
7112 * if set, overwrites the layout qualifier.
7114 if (qual
->flags
.q
.read_only
) {
7115 fields
[i
].image_read_only
= true;
7116 fields
[i
].image_write_only
= false;
7117 } else if (qual
->flags
.q
.write_only
) {
7118 fields
[i
].image_read_only
= false;
7119 fields
[i
].image_write_only
= true;
7121 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
7122 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
7125 /* For other qualifiers, we set the flag if either the layout
7126 * qualifier or the field qualifier are set
7128 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
7129 layout
->flags
.q
.coherent
;
7130 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
7131 layout
->flags
.q
._volatile
;
7132 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
7133 layout
->flags
.q
.restrict_flag
;
7140 assert(i
== decl_count
);
7142 *fields_ret
= fields
;
7148 ast_struct_specifier::hir(exec_list
*instructions
,
7149 struct _mesa_glsl_parse_state
*state
)
7151 YYLTYPE loc
= this->get_location();
7153 unsigned expl_location
= 0;
7154 if (layout
&& layout
->flags
.q
.explicit_location
) {
7155 if (!process_qualifier_constant(state
, &loc
, "location",
7156 layout
->location
, &expl_location
)) {
7159 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7163 glsl_struct_field
*fields
;
7164 unsigned decl_count
=
7165 ast_process_struct_or_iface_block_members(instructions
,
7167 &this->declarations
,
7170 GLSL_MATRIX_LAYOUT_INHERITED
,
7171 false /* allow_reserved_names */,
7174 0, /* for interface only */
7175 0, /* for interface only */
7176 0, /* for interface only */
7178 0 /* for interface only */);
7180 validate_identifier(this->name
, loc
, state
);
7182 const glsl_type
*t
=
7183 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7185 if (!state
->symbols
->add_type(name
, t
)) {
7186 const glsl_type
*match
= state
->symbols
->get_type(name
);
7187 /* allow struct matching for desktop GL - older UE4 does this */
7188 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
7189 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7191 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7193 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7195 state
->num_user_structures
+ 1);
7197 s
[state
->num_user_structures
] = t
;
7198 state
->user_structures
= s
;
7199 state
->num_user_structures
++;
7203 /* Structure type definitions do not have r-values.
7210 * Visitor class which detects whether a given interface block has been used.
7212 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7215 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7216 : mode(mode
), block(block
), found(false)
7220 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7222 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7226 return visit_continue
;
7229 bool usage_found() const
7235 ir_variable_mode mode
;
7236 const glsl_type
*block
;
7241 is_unsized_array_last_element(ir_variable
*v
)
7243 const glsl_type
*interface_type
= v
->get_interface_type();
7244 int length
= interface_type
->length
;
7246 assert(v
->type
->is_unsized_array());
7248 /* Check if it is the last element of the interface */
7249 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7255 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7257 var
->data
.image_read_only
= field
.image_read_only
;
7258 var
->data
.image_write_only
= field
.image_write_only
;
7259 var
->data
.image_coherent
= field
.image_coherent
;
7260 var
->data
.image_volatile
= field
.image_volatile
;
7261 var
->data
.image_restrict
= field
.image_restrict
;
7265 ast_interface_block::hir(exec_list
*instructions
,
7266 struct _mesa_glsl_parse_state
*state
)
7268 YYLTYPE loc
= this->get_location();
7270 /* Interface blocks must be declared at global scope */
7271 if (state
->current_function
!= NULL
) {
7272 _mesa_glsl_error(&loc
, state
,
7273 "Interface block `%s' must be declared "
7278 /* Validate qualifiers:
7280 * - Layout Qualifiers as per the table in Section 4.4
7281 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7283 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7286 * "Additionally, memory qualifiers may also be used in the declaration
7287 * of shader storage blocks"
7289 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7290 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7291 * Layout Qualifiers) of the GLSL 4.50 spec says:
7293 * "The std430 qualifier is supported only for shader storage blocks;
7294 * using std430 on a uniform block will result in a compile-time error."
7296 ast_type_qualifier allowed_blk_qualifiers
;
7297 allowed_blk_qualifiers
.flags
.i
= 0;
7298 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7299 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7300 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7301 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7302 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7303 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7304 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7305 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7306 if (this->layout
.flags
.q
.buffer
) {
7307 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7308 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7309 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7310 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7311 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7312 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7313 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7315 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7318 /* Interface block */
7319 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7321 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7322 if (this->layout
.flags
.q
.out
) {
7323 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7324 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7325 state
->stage
== MESA_SHADER_TESS_CTRL
||
7326 state
->stage
== MESA_SHADER_TESS_EVAL
||
7327 state
->stage
== MESA_SHADER_VERTEX
) {
7328 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7329 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7330 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7331 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7332 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7333 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7334 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7335 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7337 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7338 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7342 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7343 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7344 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7349 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7350 "invalid qualifier for block",
7353 /* The ast_interface_block has a list of ast_declarator_lists. We
7354 * need to turn those into ir_variables with an association
7355 * with this uniform block.
7357 enum glsl_interface_packing packing
;
7358 if (this->layout
.flags
.q
.shared
) {
7359 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7360 } else if (this->layout
.flags
.q
.packed
) {
7361 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7362 } else if (this->layout
.flags
.q
.std430
) {
7363 packing
= GLSL_INTERFACE_PACKING_STD430
;
7365 /* The default layout is std140.
7367 packing
= GLSL_INTERFACE_PACKING_STD140
;
7370 ir_variable_mode var_mode
;
7371 const char *iface_type_name
;
7372 if (this->layout
.flags
.q
.in
) {
7373 var_mode
= ir_var_shader_in
;
7374 iface_type_name
= "in";
7375 } else if (this->layout
.flags
.q
.out
) {
7376 var_mode
= ir_var_shader_out
;
7377 iface_type_name
= "out";
7378 } else if (this->layout
.flags
.q
.uniform
) {
7379 var_mode
= ir_var_uniform
;
7380 iface_type_name
= "uniform";
7381 } else if (this->layout
.flags
.q
.buffer
) {
7382 var_mode
= ir_var_shader_storage
;
7383 iface_type_name
= "buffer";
7385 var_mode
= ir_var_auto
;
7386 iface_type_name
= "UNKNOWN";
7387 assert(!"interface block layout qualifier not found!");
7390 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7391 if (this->layout
.flags
.q
.row_major
)
7392 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7393 else if (this->layout
.flags
.q
.column_major
)
7394 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7396 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7397 exec_list declared_variables
;
7398 glsl_struct_field
*fields
;
7400 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7401 * that we don't have incompatible qualifiers
7403 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7404 _mesa_glsl_error(&loc
, state
,
7405 "Interface block sets both readonly and writeonly");
7408 unsigned qual_stream
;
7409 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7411 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7412 /* If the stream qualifier is invalid it doesn't make sense to continue
7413 * on and try to compare stream layouts on member variables against it
7414 * so just return early.
7419 unsigned qual_xfb_buffer
;
7420 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7421 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7422 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7426 unsigned qual_xfb_offset
;
7427 if (layout
.flags
.q
.explicit_xfb_offset
) {
7428 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7429 layout
.offset
, &qual_xfb_offset
)) {
7434 unsigned qual_xfb_stride
;
7435 if (layout
.flags
.q
.explicit_xfb_stride
) {
7436 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7437 layout
.xfb_stride
, &qual_xfb_stride
)) {
7442 unsigned expl_location
= 0;
7443 if (layout
.flags
.q
.explicit_location
) {
7444 if (!process_qualifier_constant(state
, &loc
, "location",
7445 layout
.location
, &expl_location
)) {
7448 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7449 : VARYING_SLOT_VAR0
;
7453 unsigned expl_align
= 0;
7454 if (layout
.flags
.q
.explicit_align
) {
7455 if (!process_qualifier_constant(state
, &loc
, "align",
7456 layout
.align
, &expl_align
)) {
7459 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7460 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
7467 unsigned int num_variables
=
7468 ast_process_struct_or_iface_block_members(&declared_variables
,
7470 &this->declarations
,
7474 redeclaring_per_vertex
,
7483 if (!redeclaring_per_vertex
) {
7484 validate_identifier(this->block_name
, loc
, state
);
7486 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7488 * "Block names have no other use within a shader beyond interface
7489 * matching; it is a compile-time error to use a block name at global
7490 * scope for anything other than as a block name."
7492 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7493 if (var
&& !var
->type
->is_interface()) {
7494 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7495 "already used in the scope.",
7500 const glsl_type
*earlier_per_vertex
= NULL
;
7501 if (redeclaring_per_vertex
) {
7502 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7503 * the named interface block gl_in, we can find it by looking at the
7504 * previous declaration of gl_in. Otherwise we can find it by looking
7505 * at the previous decalartion of any of the built-in outputs,
7508 * Also check that the instance name and array-ness of the redeclaration
7512 case ir_var_shader_in
:
7513 if (ir_variable
*earlier_gl_in
=
7514 state
->symbols
->get_variable("gl_in")) {
7515 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7517 _mesa_glsl_error(&loc
, state
,
7518 "redeclaration of gl_PerVertex input not allowed "
7520 _mesa_shader_stage_to_string(state
->stage
));
7522 if (this->instance_name
== NULL
||
7523 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7524 !this->array_specifier
->is_single_dimension()) {
7525 _mesa_glsl_error(&loc
, state
,
7526 "gl_PerVertex input must be redeclared as "
7530 case ir_var_shader_out
:
7531 if (ir_variable
*earlier_gl_Position
=
7532 state
->symbols
->get_variable("gl_Position")) {
7533 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7534 } else if (ir_variable
*earlier_gl_out
=
7535 state
->symbols
->get_variable("gl_out")) {
7536 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7538 _mesa_glsl_error(&loc
, state
,
7539 "redeclaration of gl_PerVertex output not "
7540 "allowed in the %s shader",
7541 _mesa_shader_stage_to_string(state
->stage
));
7543 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7544 if (this->instance_name
== NULL
||
7545 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7546 _mesa_glsl_error(&loc
, state
,
7547 "gl_PerVertex output must be redeclared as "
7551 if (this->instance_name
!= NULL
) {
7552 _mesa_glsl_error(&loc
, state
,
7553 "gl_PerVertex output may not be redeclared with "
7554 "an instance name");
7559 _mesa_glsl_error(&loc
, state
,
7560 "gl_PerVertex must be declared as an input or an "
7565 if (earlier_per_vertex
== NULL
) {
7566 /* An error has already been reported. Bail out to avoid null
7567 * dereferences later in this function.
7572 /* Copy locations from the old gl_PerVertex interface block. */
7573 for (unsigned i
= 0; i
< num_variables
; i
++) {
7574 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7576 _mesa_glsl_error(&loc
, state
,
7577 "redeclaration of gl_PerVertex must be a subset "
7578 "of the built-in members of gl_PerVertex");
7580 fields
[i
].location
=
7581 earlier_per_vertex
->fields
.structure
[j
].location
;
7583 earlier_per_vertex
->fields
.structure
[j
].offset
;
7584 fields
[i
].interpolation
=
7585 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7586 fields
[i
].centroid
=
7587 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7589 earlier_per_vertex
->fields
.structure
[j
].sample
;
7591 earlier_per_vertex
->fields
.structure
[j
].patch
;
7592 fields
[i
].precision
=
7593 earlier_per_vertex
->fields
.structure
[j
].precision
;
7594 fields
[i
].explicit_xfb_buffer
=
7595 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7596 fields
[i
].xfb_buffer
=
7597 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7598 fields
[i
].xfb_stride
=
7599 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7603 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7606 * If a built-in interface block is redeclared, it must appear in
7607 * the shader before any use of any member included in the built-in
7608 * declaration, or a compilation error will result.
7610 * This appears to be a clarification to the behaviour established for
7611 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7612 * regardless of GLSL version.
7614 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7615 v
.run(instructions
);
7616 if (v
.usage_found()) {
7617 _mesa_glsl_error(&loc
, state
,
7618 "redeclaration of a built-in interface block must "
7619 "appear before any use of any member of the "
7624 const glsl_type
*block_type
=
7625 glsl_type::get_interface_instance(fields
,
7629 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
7632 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7634 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7635 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7638 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7639 YYLTYPE loc
= this->get_location();
7640 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7641 "already taken in the current scope",
7642 this->block_name
, iface_type_name
);
7645 /* Since interface blocks cannot contain statements, it should be
7646 * impossible for the block to generate any instructions.
7648 assert(declared_variables
.is_empty());
7650 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7652 * Geometry shader input variables get the per-vertex values written
7653 * out by vertex shader output variables of the same names. Since a
7654 * geometry shader operates on a set of vertices, each input varying
7655 * variable (or input block, see interface blocks below) needs to be
7656 * declared as an array.
7658 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7659 var_mode
== ir_var_shader_in
) {
7660 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7661 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7662 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7663 !this->layout
.flags
.q
.patch
&&
7664 this->array_specifier
== NULL
&&
7665 var_mode
== ir_var_shader_in
) {
7666 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7667 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7668 !this->layout
.flags
.q
.patch
&&
7669 this->array_specifier
== NULL
&&
7670 var_mode
== ir_var_shader_out
) {
7671 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7675 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7678 * "If an instance name (instance-name) is used, then it puts all the
7679 * members inside a scope within its own name space, accessed with the
7680 * field selector ( . ) operator (analogously to structures)."
7682 if (this->instance_name
) {
7683 if (redeclaring_per_vertex
) {
7684 /* When a built-in in an unnamed interface block is redeclared,
7685 * get_variable_being_redeclared() calls
7686 * check_builtin_array_max_size() to make sure that built-in array
7687 * variables aren't redeclared to illegal sizes. But we're looking
7688 * at a redeclaration of a named built-in interface block. So we
7689 * have to manually call check_builtin_array_max_size() for all parts
7690 * of the interface that are arrays.
7692 for (unsigned i
= 0; i
< num_variables
; i
++) {
7693 if (fields
[i
].type
->is_array()) {
7694 const unsigned size
= fields
[i
].type
->array_size();
7695 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7699 validate_identifier(this->instance_name
, loc
, state
);
7704 if (this->array_specifier
!= NULL
) {
7705 const glsl_type
*block_array_type
=
7706 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7708 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7710 * For uniform blocks declared an array, each individual array
7711 * element corresponds to a separate buffer object backing one
7712 * instance of the block. As the array size indicates the number
7713 * of buffer objects needed, uniform block array declarations
7714 * must specify an array size.
7716 * And a few paragraphs later:
7718 * Geometry shader input blocks must be declared as arrays and
7719 * follow the array declaration and linking rules for all
7720 * geometry shader inputs. All other input and output block
7721 * arrays must specify an array size.
7723 * The same applies to tessellation shaders.
7725 * The upshot of this is that the only circumstance where an
7726 * interface array size *doesn't* need to be specified is on a
7727 * geometry shader input, tessellation control shader input,
7728 * tessellation control shader output, and tessellation evaluation
7731 if (block_array_type
->is_unsized_array()) {
7732 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7733 state
->stage
== MESA_SHADER_TESS_CTRL
||
7734 state
->stage
== MESA_SHADER_TESS_EVAL
;
7735 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7737 if (this->layout
.flags
.q
.in
) {
7739 _mesa_glsl_error(&loc
, state
,
7740 "unsized input block arrays not allowed in "
7742 _mesa_shader_stage_to_string(state
->stage
));
7743 } else if (this->layout
.flags
.q
.out
) {
7745 _mesa_glsl_error(&loc
, state
,
7746 "unsized output block arrays not allowed in "
7748 _mesa_shader_stage_to_string(state
->stage
));
7750 /* by elimination, this is a uniform block array */
7751 _mesa_glsl_error(&loc
, state
,
7752 "unsized uniform block arrays not allowed in "
7754 _mesa_shader_stage_to_string(state
->stage
));
7758 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7760 * * Arrays of arrays of blocks are not allowed
7762 if (state
->es_shader
&& block_array_type
->is_array() &&
7763 block_array_type
->fields
.array
->is_array()) {
7764 _mesa_glsl_error(&loc
, state
,
7765 "arrays of arrays interface blocks are "
7769 var
= new(state
) ir_variable(block_array_type
,
7770 this->instance_name
,
7773 var
= new(state
) ir_variable(block_type
,
7774 this->instance_name
,
7778 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7779 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7781 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7782 var
->data
.read_only
= true;
7784 var
->data
.patch
= this->layout
.flags
.q
.patch
;
7786 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7787 handle_geometry_shader_input_decl(state
, loc
, var
);
7788 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7789 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7790 handle_tess_shader_input_decl(state
, loc
, var
);
7791 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7792 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7794 for (unsigned i
= 0; i
< num_variables
; i
++) {
7795 if (var
->data
.mode
== ir_var_shader_storage
)
7796 apply_memory_qualifiers(var
, fields
[i
]);
7799 if (ir_variable
*earlier
=
7800 state
->symbols
->get_variable(this->instance_name
)) {
7801 if (!redeclaring_per_vertex
) {
7802 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7803 this->instance_name
);
7805 earlier
->data
.how_declared
= ir_var_declared_normally
;
7806 earlier
->type
= var
->type
;
7807 earlier
->reinit_interface_type(block_type
);
7810 if (this->layout
.flags
.q
.explicit_binding
) {
7811 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7815 var
->data
.stream
= qual_stream
;
7816 if (layout
.flags
.q
.explicit_location
) {
7817 var
->data
.location
= expl_location
;
7818 var
->data
.explicit_location
= true;
7821 state
->symbols
->add_variable(var
);
7822 instructions
->push_tail(var
);
7825 /* In order to have an array size, the block must also be declared with
7828 assert(this->array_specifier
== NULL
);
7830 for (unsigned i
= 0; i
< num_variables
; i
++) {
7832 new(state
) ir_variable(fields
[i
].type
,
7833 ralloc_strdup(state
, fields
[i
].name
),
7835 var
->data
.interpolation
= fields
[i
].interpolation
;
7836 var
->data
.centroid
= fields
[i
].centroid
;
7837 var
->data
.sample
= fields
[i
].sample
;
7838 var
->data
.patch
= fields
[i
].patch
;
7839 var
->data
.stream
= qual_stream
;
7840 var
->data
.location
= fields
[i
].location
;
7842 if (fields
[i
].location
!= -1)
7843 var
->data
.explicit_location
= true;
7845 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7846 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7848 if (fields
[i
].offset
!= -1)
7849 var
->data
.explicit_xfb_offset
= true;
7850 var
->data
.offset
= fields
[i
].offset
;
7852 var
->init_interface_type(block_type
);
7854 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7855 var
->data
.read_only
= true;
7857 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7858 if (state
->es_shader
) {
7859 var
->data
.precision
=
7860 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7864 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7865 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7866 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7868 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7871 if (var
->data
.mode
== ir_var_shader_storage
)
7872 apply_memory_qualifiers(var
, fields
[i
]);
7874 /* Examine var name here since var may get deleted in the next call */
7875 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7877 if (redeclaring_per_vertex
) {
7878 bool is_redeclaration
;
7879 ir_variable
*declared_var
=
7880 get_variable_being_redeclared(var
, loc
, state
,
7881 true /* allow_all_redeclarations */,
7883 if (!var_is_gl_id
|| !is_redeclaration
) {
7884 _mesa_glsl_error(&loc
, state
,
7885 "redeclaration of gl_PerVertex can only "
7886 "include built-in variables");
7887 } else if (declared_var
->data
.how_declared
== ir_var_declared_normally
) {
7888 _mesa_glsl_error(&loc
, state
,
7889 "`%s' has already been redeclared",
7890 declared_var
->name
);
7892 declared_var
->data
.how_declared
= ir_var_declared_in_block
;
7893 declared_var
->reinit_interface_type(block_type
);
7898 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7899 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7901 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7902 * The UBO declaration itself doesn't get an ir_variable unless it
7903 * has an instance name. This is ugly.
7905 if (this->layout
.flags
.q
.explicit_binding
) {
7906 apply_explicit_binding(state
, &loc
, var
,
7907 var
->get_interface_type(), &this->layout
);
7910 if (var
->type
->is_unsized_array()) {
7911 if (var
->is_in_shader_storage_block() &&
7912 is_unsized_array_last_element(var
)) {
7913 var
->data
.from_ssbo_unsized_array
= true;
7915 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7917 * "If an array is declared as the last member of a shader storage
7918 * block and the size is not specified at compile-time, it is
7919 * sized at run-time. In all other cases, arrays are sized only
7922 * In desktop GLSL it is allowed to have unsized-arrays that are
7923 * not last, as long as we can determine that they are implicitly
7926 if (state
->es_shader
) {
7927 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
7928 "definition: only last member of a shader "
7929 "storage block can be defined as unsized "
7930 "array", fields
[i
].name
);
7935 state
->symbols
->add_variable(var
);
7936 instructions
->push_tail(var
);
7939 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7940 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7942 * It is also a compilation error ... to redeclare a built-in
7943 * block and then use a member from that built-in block that was
7944 * not included in the redeclaration.
7946 * This appears to be a clarification to the behaviour established
7947 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7948 * behaviour regardless of GLSL version.
7950 * To prevent the shader from using a member that was not included in
7951 * the redeclaration, we disable any ir_variables that are still
7952 * associated with the old declaration of gl_PerVertex (since we've
7953 * already updated all of the variables contained in the new
7954 * gl_PerVertex to point to it).
7956 * As a side effect this will prevent
7957 * validate_intrastage_interface_blocks() from getting confused and
7958 * thinking there are conflicting definitions of gl_PerVertex in the
7961 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7962 ir_variable
*const var
= node
->as_variable();
7964 var
->get_interface_type() == earlier_per_vertex
&&
7965 var
->data
.mode
== var_mode
) {
7966 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7967 _mesa_glsl_error(&loc
, state
,
7968 "redeclaration of gl_PerVertex cannot "
7969 "follow a redeclaration of `%s'",
7972 state
->symbols
->disable_variable(var
->name
);
7984 ast_tcs_output_layout::hir(exec_list
*instructions
,
7985 struct _mesa_glsl_parse_state
*state
)
7987 YYLTYPE loc
= this->get_location();
7989 unsigned num_vertices
;
7990 if (!state
->out_qualifier
->vertices
->
7991 process_qualifier_constant(state
, "vertices", &num_vertices
,
7993 /* return here to stop cascading incorrect error messages */
7997 /* If any shader outputs occurred before this declaration and specified an
7998 * array size, make sure the size they specified is consistent with the
8001 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8002 _mesa_glsl_error(&loc
, state
,
8003 "this tessellation control shader output layout "
8004 "specifies %u vertices, but a previous output "
8005 "is declared with size %u",
8006 num_vertices
, state
->tcs_output_size
);
8010 state
->tcs_output_vertices_specified
= true;
8012 /* If any shader outputs occurred before this declaration and did not
8013 * specify an array size, their size is determined now.
8015 foreach_in_list (ir_instruction
, node
, instructions
) {
8016 ir_variable
*var
= node
->as_variable();
8017 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8020 /* Note: Not all tessellation control shader output are arrays. */
8021 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8024 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8025 _mesa_glsl_error(&loc
, state
,
8026 "this tessellation control shader output layout "
8027 "specifies %u vertices, but an access to element "
8028 "%u of output `%s' already exists", num_vertices
,
8029 var
->data
.max_array_access
, var
->name
);
8031 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8041 ast_gs_input_layout::hir(exec_list
*instructions
,
8042 struct _mesa_glsl_parse_state
*state
)
8044 YYLTYPE loc
= this->get_location();
8046 /* Should have been prevented by the parser. */
8047 assert(!state
->gs_input_prim_type_specified
8048 || state
->in_qualifier
->prim_type
== this->prim_type
);
8050 /* If any shader inputs occurred before this declaration and specified an
8051 * array size, make sure the size they specified is consistent with the
8054 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8055 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8056 _mesa_glsl_error(&loc
, state
,
8057 "this geometry shader input layout implies %u vertices"
8058 " per primitive, but a previous input is declared"
8059 " with size %u", num_vertices
, state
->gs_input_size
);
8063 state
->gs_input_prim_type_specified
= true;
8065 /* If any shader inputs occurred before this declaration and did not
8066 * specify an array size, their size is determined now.
8068 foreach_in_list(ir_instruction
, node
, instructions
) {
8069 ir_variable
*var
= node
->as_variable();
8070 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8073 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8077 if (var
->type
->is_unsized_array()) {
8078 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8079 _mesa_glsl_error(&loc
, state
,
8080 "this geometry shader input layout implies %u"
8081 " vertices, but an access to element %u of input"
8082 " `%s' already exists", num_vertices
,
8083 var
->data
.max_array_access
, var
->name
);
8085 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8096 ast_cs_input_layout::hir(exec_list
*instructions
,
8097 struct _mesa_glsl_parse_state
*state
)
8099 YYLTYPE loc
= this->get_location();
8101 /* From the ARB_compute_shader specification:
8103 * If the local size of the shader in any dimension is greater
8104 * than the maximum size supported by the implementation for that
8105 * dimension, a compile-time error results.
8107 * It is not clear from the spec how the error should be reported if
8108 * the total size of the work group exceeds
8109 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8110 * report it at compile time as well.
8112 GLuint64 total_invocations
= 1;
8113 unsigned qual_local_size
[3];
8114 for (int i
= 0; i
< 3; i
++) {
8116 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8118 /* Infer a local_size of 1 for unspecified dimensions */
8119 if (this->local_size
[i
] == NULL
) {
8120 qual_local_size
[i
] = 1;
8121 } else if (!this->local_size
[i
]->
8122 process_qualifier_constant(state
, local_size_str
,
8123 &qual_local_size
[i
], false)) {
8124 ralloc_free(local_size_str
);
8127 ralloc_free(local_size_str
);
8129 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8130 _mesa_glsl_error(&loc
, state
,
8131 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8133 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8136 total_invocations
*= qual_local_size
[i
];
8137 if (total_invocations
>
8138 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8139 _mesa_glsl_error(&loc
, state
,
8140 "product of local_sizes exceeds "
8141 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8142 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8147 /* If any compute input layout declaration preceded this one, make sure it
8148 * was consistent with this one.
8150 if (state
->cs_input_local_size_specified
) {
8151 for (int i
= 0; i
< 3; i
++) {
8152 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8153 _mesa_glsl_error(&loc
, state
,
8154 "compute shader input layout does not match"
8155 " previous declaration");
8161 /* The ARB_compute_variable_group_size spec says:
8163 * If a compute shader including a *local_size_variable* qualifier also
8164 * declares a fixed local group size using the *local_size_x*,
8165 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8168 if (state
->cs_input_local_size_variable_specified
) {
8169 _mesa_glsl_error(&loc
, state
,
8170 "compute shader can't include both a variable and a "
8171 "fixed local group size");
8175 state
->cs_input_local_size_specified
= true;
8176 for (int i
= 0; i
< 3; i
++)
8177 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8179 /* We may now declare the built-in constant gl_WorkGroupSize (see
8180 * builtin_variable_generator::generate_constants() for why we didn't
8181 * declare it earlier).
8183 ir_variable
*var
= new(state
->symbols
)
8184 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8185 var
->data
.how_declared
= ir_var_declared_implicitly
;
8186 var
->data
.read_only
= true;
8187 instructions
->push_tail(var
);
8188 state
->symbols
->add_variable(var
);
8189 ir_constant_data data
;
8190 memset(&data
, 0, sizeof(data
));
8191 for (int i
= 0; i
< 3; i
++)
8192 data
.u
[i
] = qual_local_size
[i
];
8193 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8194 var
->constant_initializer
=
8195 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8196 var
->data
.has_initializer
= true;
8203 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8204 exec_list
*instructions
)
8206 bool gl_FragColor_assigned
= false;
8207 bool gl_FragData_assigned
= false;
8208 bool gl_FragSecondaryColor_assigned
= false;
8209 bool gl_FragSecondaryData_assigned
= false;
8210 bool user_defined_fs_output_assigned
= false;
8211 ir_variable
*user_defined_fs_output
= NULL
;
8213 /* It would be nice to have proper location information. */
8215 memset(&loc
, 0, sizeof(loc
));
8217 foreach_in_list(ir_instruction
, node
, instructions
) {
8218 ir_variable
*var
= node
->as_variable();
8220 if (!var
|| !var
->data
.assigned
)
8223 if (strcmp(var
->name
, "gl_FragColor") == 0)
8224 gl_FragColor_assigned
= true;
8225 else if (strcmp(var
->name
, "gl_FragData") == 0)
8226 gl_FragData_assigned
= true;
8227 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8228 gl_FragSecondaryColor_assigned
= true;
8229 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8230 gl_FragSecondaryData_assigned
= true;
8231 else if (!is_gl_identifier(var
->name
)) {
8232 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8233 var
->data
.mode
== ir_var_shader_out
) {
8234 user_defined_fs_output_assigned
= true;
8235 user_defined_fs_output
= var
;
8240 /* From the GLSL 1.30 spec:
8242 * "If a shader statically assigns a value to gl_FragColor, it
8243 * may not assign a value to any element of gl_FragData. If a
8244 * shader statically writes a value to any element of
8245 * gl_FragData, it may not assign a value to
8246 * gl_FragColor. That is, a shader may assign values to either
8247 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8248 * linked together must also consistently write just one of
8249 * these variables. Similarly, if user declared output
8250 * variables are in use (statically assigned to), then the
8251 * built-in variables gl_FragColor and gl_FragData may not be
8252 * assigned to. These incorrect usages all generate compile
8255 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8256 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8257 "`gl_FragColor' and `gl_FragData'");
8258 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8259 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8260 "`gl_FragColor' and `%s'",
8261 user_defined_fs_output
->name
);
8262 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8263 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8264 "`gl_FragSecondaryColorEXT' and"
8265 " `gl_FragSecondaryDataEXT'");
8266 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8267 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8268 "`gl_FragColor' and"
8269 " `gl_FragSecondaryDataEXT'");
8270 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8271 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8273 " `gl_FragSecondaryColorEXT'");
8274 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8275 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8276 "`gl_FragData' and `%s'",
8277 user_defined_fs_output
->name
);
8280 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8281 !state
->EXT_blend_func_extended_enable
) {
8282 _mesa_glsl_error(&loc
, state
,
8283 "Dual source blending requires EXT_blend_func_extended");
8289 remove_per_vertex_blocks(exec_list
*instructions
,
8290 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8292 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8293 * if it exists in this shader type.
8295 const glsl_type
*per_vertex
= NULL
;
8297 case ir_var_shader_in
:
8298 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8299 per_vertex
= gl_in
->get_interface_type();
8301 case ir_var_shader_out
:
8302 if (ir_variable
*gl_Position
=
8303 state
->symbols
->get_variable("gl_Position")) {
8304 per_vertex
= gl_Position
->get_interface_type();
8308 assert(!"Unexpected mode");
8312 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8313 * need to do anything.
8315 if (per_vertex
== NULL
)
8318 /* If the interface block is used by the shader, then we don't need to do
8321 interface_block_usage_visitor
v(mode
, per_vertex
);
8322 v
.run(instructions
);
8323 if (v
.usage_found())
8326 /* Remove any ir_variable declarations that refer to the interface block
8329 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8330 ir_variable
*const var
= node
->as_variable();
8331 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8332 var
->data
.mode
== mode
) {
8333 state
->symbols
->disable_variable(var
->name
);