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
->is_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
->is_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
->is_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
->is_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
->is_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
->is_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
->is_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
->is_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
->is_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
->is_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
->is_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
;
2934 validate_fragment_flat_interpolation_input(struct _mesa_glsl_parse_state
*state
,
2936 const glsl_interp_mode interpolation
,
2937 const struct glsl_type
*var_type
,
2938 ir_variable_mode mode
)
2940 if (state
->stage
!= MESA_SHADER_FRAGMENT
||
2941 interpolation
== INTERP_MODE_FLAT
||
2942 mode
!= ir_var_shader_in
)
2945 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
2946 * so must integer vertex outputs.
2948 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
2949 * "Fragment shader inputs that are signed or unsigned integers or
2950 * integer vectors must be qualified with the interpolation qualifier
2953 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
2954 * "Fragment shader inputs that are, or contain, signed or unsigned
2955 * integers or integer vectors must be qualified with the
2956 * interpolation qualifier flat."
2958 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
2959 * "Vertex shader outputs that are, or contain, signed or unsigned
2960 * integers or integer vectors must be qualified with the
2961 * interpolation qualifier flat."
2963 * Note that prior to GLSL 1.50, this requirement applied to vertex
2964 * outputs rather than fragment inputs. That creates problems in the
2965 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
2966 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
2967 * apply the restriction to both vertex outputs and fragment inputs.
2969 * Note also that the desktop GLSL specs are missing the text "or
2970 * contain"; this is presumably an oversight, since there is no
2971 * reasonable way to interpolate a fragment shader input that contains
2972 * an integer. See Khronos bug #15671.
2974 if (state
->is_version(130, 300)
2975 && var_type
->contains_integer()) {
2976 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
2977 "an integer, then it must be qualified with 'flat'");
2980 /* Double fragment inputs must be qualified with 'flat'.
2982 * From the "Overview" of the ARB_gpu_shader_fp64 extension spec:
2983 * "This extension does not support interpolation of double-precision
2984 * values; doubles used as fragment shader inputs must be qualified as
2987 * From section 4.3.4 ("Inputs") of the GLSL 4.00 spec:
2988 * "Fragment shader inputs that are signed or unsigned integers, integer
2989 * vectors, or any double-precision floating-point type must be
2990 * qualified with the interpolation qualifier flat."
2992 * Note that the GLSL specs are missing the text "or contain"; this is
2993 * presumably an oversight. See Khronos bug #15671.
2995 * The 'double' type does not exist in GLSL ES so far.
2997 if (state
->has_double()
2998 && var_type
->contains_double()) {
2999 _mesa_glsl_error(loc
, state
, "if a fragment input is (or contains) "
3000 "a double, then it must be qualified with 'flat'");
3005 validate_interpolation_qualifier(struct _mesa_glsl_parse_state
*state
,
3007 const glsl_interp_mode interpolation
,
3008 const struct ast_type_qualifier
*qual
,
3009 const struct glsl_type
*var_type
,
3010 ir_variable_mode mode
)
3012 /* Interpolation qualifiers can only apply to shader inputs or outputs, but
3013 * not to vertex shader inputs nor fragment shader outputs.
3015 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3016 * "Outputs from a vertex shader (out) and inputs to a fragment
3017 * shader (in) can be further qualified with one or more of these
3018 * interpolation qualifiers"
3020 * "These interpolation qualifiers may only precede the qualifiers in,
3021 * centroid in, out, or centroid out in a declaration. They do not apply
3022 * to the deprecated storage qualifiers varying or centroid
3023 * varying. They also do not apply to inputs into a vertex shader or
3024 * outputs from a fragment shader."
3026 * From section 4.3 ("Storage Qualifiers") of the GLSL ES 3.00 spec:
3027 * "Outputs from a shader (out) and inputs to a shader (in) can be
3028 * further qualified with one of these interpolation qualifiers."
3030 * "These interpolation qualifiers may only precede the qualifiers
3031 * in, centroid in, out, or centroid out in a declaration. They do
3032 * not apply to inputs into a vertex shader or outputs from a
3035 if (state
->is_version(130, 300)
3036 && interpolation
!= INTERP_MODE_NONE
) {
3037 const char *i
= interpolation_string(interpolation
);
3038 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
)
3039 _mesa_glsl_error(loc
, state
,
3040 "interpolation qualifier `%s' can only be applied to "
3041 "shader inputs or outputs.", i
);
3043 switch (state
->stage
) {
3044 case MESA_SHADER_VERTEX
:
3045 if (mode
== ir_var_shader_in
) {
3046 _mesa_glsl_error(loc
, state
,
3047 "interpolation qualifier '%s' cannot be applied to "
3048 "vertex shader inputs", i
);
3051 case MESA_SHADER_FRAGMENT
:
3052 if (mode
== ir_var_shader_out
) {
3053 _mesa_glsl_error(loc
, state
,
3054 "interpolation qualifier '%s' cannot be applied to "
3055 "fragment shader outputs", i
);
3063 /* Interpolation qualifiers cannot be applied to 'centroid' and
3064 * 'centroid varying'.
3066 * From section 4.3 ("Storage Qualifiers") of the GLSL 1.30 spec:
3067 * "interpolation qualifiers may only precede the qualifiers in,
3068 * centroid in, out, or centroid out in a declaration. They do not apply
3069 * to the deprecated storage qualifiers varying or centroid varying."
3071 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
3073 if (state
->is_version(130, 0)
3074 && interpolation
!= INTERP_MODE_NONE
3075 && qual
->flags
.q
.varying
) {
3077 const char *i
= interpolation_string(interpolation
);
3079 if (qual
->flags
.q
.centroid
)
3080 s
= "centroid varying";
3084 _mesa_glsl_error(loc
, state
,
3085 "qualifier '%s' cannot be applied to the "
3086 "deprecated storage qualifier '%s'", i
, s
);
3089 validate_fragment_flat_interpolation_input(state
, loc
, interpolation
,
3093 static glsl_interp_mode
3094 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
3095 const struct glsl_type
*var_type
,
3096 ir_variable_mode mode
,
3097 struct _mesa_glsl_parse_state
*state
,
3100 glsl_interp_mode interpolation
;
3101 if (qual
->flags
.q
.flat
)
3102 interpolation
= INTERP_MODE_FLAT
;
3103 else if (qual
->flags
.q
.noperspective
)
3104 interpolation
= INTERP_MODE_NOPERSPECTIVE
;
3105 else if (qual
->flags
.q
.smooth
)
3106 interpolation
= INTERP_MODE_SMOOTH
;
3107 else if (state
->es_shader
&&
3108 ((mode
== ir_var_shader_in
&&
3109 state
->stage
!= MESA_SHADER_VERTEX
) ||
3110 (mode
== ir_var_shader_out
&&
3111 state
->stage
!= MESA_SHADER_FRAGMENT
)))
3112 /* Section 4.3.9 (Interpolation) of the GLSL ES 3.00 spec says:
3114 * "When no interpolation qualifier is present, smooth interpolation
3117 interpolation
= INTERP_MODE_SMOOTH
;
3119 interpolation
= INTERP_MODE_NONE
;
3121 validate_interpolation_qualifier(state
, loc
,
3123 qual
, var_type
, mode
);
3125 return interpolation
;
3130 apply_explicit_location(const struct ast_type_qualifier
*qual
,
3132 struct _mesa_glsl_parse_state
*state
,
3137 unsigned qual_location
;
3138 if (!process_qualifier_constant(state
, loc
, "location", qual
->location
,
3143 /* Checks for GL_ARB_explicit_uniform_location. */
3144 if (qual
->flags
.q
.uniform
) {
3145 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
3148 const struct gl_context
*const ctx
= state
->ctx
;
3149 unsigned max_loc
= qual_location
+ var
->type
->uniform_locations() - 1;
3151 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
3152 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
3153 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
3154 ctx
->Const
.MaxUserAssignableUniformLocations
);
3158 var
->data
.explicit_location
= true;
3159 var
->data
.location
= qual_location
;
3163 /* Between GL_ARB_explicit_attrib_location an
3164 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
3165 * stage can be assigned explicit locations. The checking here associates
3166 * the correct extension with the correct stage's input / output:
3170 * vertex explicit_loc sso
3171 * tess control sso sso
3174 * fragment sso explicit_loc
3176 switch (state
->stage
) {
3177 case MESA_SHADER_VERTEX
:
3178 if (var
->data
.mode
== ir_var_shader_in
) {
3179 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3185 if (var
->data
.mode
== ir_var_shader_out
) {
3186 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3195 case MESA_SHADER_TESS_CTRL
:
3196 case MESA_SHADER_TESS_EVAL
:
3197 case MESA_SHADER_GEOMETRY
:
3198 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
3199 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3208 case MESA_SHADER_FRAGMENT
:
3209 if (var
->data
.mode
== ir_var_shader_in
) {
3210 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
3216 if (var
->data
.mode
== ir_var_shader_out
) {
3217 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
3226 case MESA_SHADER_COMPUTE
:
3227 _mesa_glsl_error(loc
, state
,
3228 "compute shader variables cannot be given "
3229 "explicit locations");
3234 _mesa_glsl_error(loc
, state
,
3235 "%s cannot be given an explicit location in %s shader",
3237 _mesa_shader_stage_to_string(state
->stage
));
3239 var
->data
.explicit_location
= true;
3241 switch (state
->stage
) {
3242 case MESA_SHADER_VERTEX
:
3243 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
3244 ? (qual_location
+ VERT_ATTRIB_GENERIC0
)
3245 : (qual_location
+ VARYING_SLOT_VAR0
);
3248 case MESA_SHADER_TESS_CTRL
:
3249 case MESA_SHADER_TESS_EVAL
:
3250 case MESA_SHADER_GEOMETRY
:
3251 if (var
->data
.patch
)
3252 var
->data
.location
= qual_location
+ VARYING_SLOT_PATCH0
;
3254 var
->data
.location
= qual_location
+ VARYING_SLOT_VAR0
;
3257 case MESA_SHADER_FRAGMENT
:
3258 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
3259 ? (qual_location
+ FRAG_RESULT_DATA0
)
3260 : (qual_location
+ VARYING_SLOT_VAR0
);
3262 case MESA_SHADER_COMPUTE
:
3263 assert(!"Unexpected shader type");
3267 /* Check if index was set for the uniform instead of the function */
3268 if (qual
->flags
.q
.explicit_index
&& qual
->is_subroutine_decl()) {
3269 _mesa_glsl_error(loc
, state
, "an index qualifier can only be "
3270 "used with subroutine functions");
3274 unsigned qual_index
;
3275 if (qual
->flags
.q
.explicit_index
&&
3276 process_qualifier_constant(state
, loc
, "index", qual
->index
,
3278 /* From the GLSL 4.30 specification, section 4.4.2 (Output
3279 * Layout Qualifiers):
3281 * "It is also a compile-time error if a fragment shader
3282 * sets a layout index to less than 0 or greater than 1."
3284 * Older specifications don't mandate a behavior; we take
3285 * this as a clarification and always generate the error.
3287 if (qual_index
> 1) {
3288 _mesa_glsl_error(loc
, state
,
3289 "explicit index may only be 0 or 1");
3291 var
->data
.explicit_index
= true;
3292 var
->data
.index
= qual_index
;
3299 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3301 struct _mesa_glsl_parse_state
*state
,
3304 const glsl_type
*base_type
= var
->type
->without_array();
3306 if (!base_type
->is_image()) {
3307 if (qual
->flags
.q
.read_only
||
3308 qual
->flags
.q
.write_only
||
3309 qual
->flags
.q
.coherent
||
3310 qual
->flags
.q
._volatile
||
3311 qual
->flags
.q
.restrict_flag
||
3312 qual
->flags
.q
.explicit_image_format
) {
3313 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied "
3319 if (var
->data
.mode
!= ir_var_uniform
&&
3320 var
->data
.mode
!= ir_var_function_in
) {
3321 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
3322 "function parameters or uniform-qualified "
3323 "global variables");
3326 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
3327 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
3328 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
3329 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
3330 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
3331 var
->data
.read_only
= true;
3333 if (qual
->flags
.q
.explicit_image_format
) {
3334 if (var
->data
.mode
== ir_var_function_in
) {
3335 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be used on "
3336 "image function parameters");
3339 if (qual
->image_base_type
!= base_type
->sampled_type
) {
3340 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the base "
3341 "data type of the image");
3344 var
->data
.image_format
= qual
->image_format
;
3346 if (var
->data
.mode
== ir_var_uniform
) {
3347 if (state
->es_shader
) {
3348 _mesa_glsl_error(loc
, state
, "all image uniforms must have a "
3349 "format layout qualifier");
3350 } else if (!qual
->flags
.q
.write_only
) {
3351 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
3352 "`writeonly' must have a format layout qualifier");
3355 var
->data
.image_format
= GL_NONE
;
3358 /* From page 70 of the GLSL ES 3.1 specification:
3360 * "Except for image variables qualified with the format qualifiers r32f,
3361 * r32i, and r32ui, image variables must specify either memory qualifier
3362 * readonly or the memory qualifier writeonly."
3364 if (state
->es_shader
&&
3365 var
->data
.image_format
!= GL_R32F
&&
3366 var
->data
.image_format
!= GL_R32I
&&
3367 var
->data
.image_format
!= GL_R32UI
&&
3368 !var
->data
.image_read_only
&&
3369 !var
->data
.image_write_only
) {
3370 _mesa_glsl_error(loc
, state
, "image variables of format other than r32f, "
3371 "r32i or r32ui must be qualified `readonly' or "
3376 static inline const char*
3377 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
3379 if (origin_upper_left
&& pixel_center_integer
)
3380 return "origin_upper_left, pixel_center_integer";
3381 else if (origin_upper_left
)
3382 return "origin_upper_left";
3383 else if (pixel_center_integer
)
3384 return "pixel_center_integer";
3390 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
3391 const struct ast_type_qualifier
*qual
)
3393 /* If gl_FragCoord was previously declared, and the qualifiers were
3394 * different in any way, return true.
3396 if (state
->fs_redeclares_gl_fragcoord
) {
3397 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
3398 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
3405 validate_array_dimensions(const glsl_type
*t
,
3406 struct _mesa_glsl_parse_state
*state
,
3408 if (t
->is_array()) {
3409 t
= t
->fields
.array
;
3410 while (t
->is_array()) {
3411 if (t
->is_unsized_array()) {
3412 _mesa_glsl_error(loc
, state
,
3413 "only the outermost array dimension can "
3418 t
= t
->fields
.array
;
3424 apply_layout_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3426 struct _mesa_glsl_parse_state
*state
,
3429 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
3431 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
3433 * "Within any shader, the first redeclarations of gl_FragCoord
3434 * must appear before any use of gl_FragCoord."
3436 * Generate a compiler error if above condition is not met by the
3439 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
3440 if (earlier
!= NULL
&&
3441 earlier
->data
.used
&&
3442 !state
->fs_redeclares_gl_fragcoord
) {
3443 _mesa_glsl_error(loc
, state
,
3444 "gl_FragCoord used before its first redeclaration "
3445 "in fragment shader");
3448 /* Make sure all gl_FragCoord redeclarations specify the same layout
3451 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
3452 const char *const qual_string
=
3453 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
3454 qual
->flags
.q
.pixel_center_integer
);
3456 const char *const state_string
=
3457 get_layout_qualifier_string(state
->fs_origin_upper_left
,
3458 state
->fs_pixel_center_integer
);
3460 _mesa_glsl_error(loc
, state
,
3461 "gl_FragCoord redeclared with different layout "
3462 "qualifiers (%s) and (%s) ",
3466 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3467 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3468 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
3469 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
3470 state
->fs_redeclares_gl_fragcoord
=
3471 state
->fs_origin_upper_left
||
3472 state
->fs_pixel_center_integer
||
3473 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
3476 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
3477 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
3478 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
3479 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
3480 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
3481 ? "origin_upper_left" : "pixel_center_integer";
3483 _mesa_glsl_error(loc
, state
,
3484 "layout qualifier `%s' can only be applied to "
3485 "fragment shader input `gl_FragCoord'",
3489 if (qual
->flags
.q
.explicit_location
) {
3490 apply_explicit_location(qual
, var
, state
, loc
);
3492 if (qual
->flags
.q
.explicit_component
) {
3493 unsigned qual_component
;
3494 if (process_qualifier_constant(state
, loc
, "component",
3495 qual
->component
, &qual_component
)) {
3496 const glsl_type
*type
= var
->type
->without_array();
3497 unsigned components
= type
->component_slots();
3499 if (type
->is_matrix() || type
->is_record()) {
3500 _mesa_glsl_error(loc
, state
, "component layout qualifier "
3501 "cannot be applied to a matrix, a structure, "
3502 "a block, or an array containing any of "
3504 } else if (qual_component
!= 0 &&
3505 (qual_component
+ components
- 1) > 3) {
3506 _mesa_glsl_error(loc
, state
, "component overflow (%u > 3)",
3507 (qual_component
+ components
- 1));
3508 } else if (qual_component
== 1 && type
->is_64bit()) {
3509 /* We don't bother checking for 3 as it should be caught by the
3510 * overflow check above.
3512 _mesa_glsl_error(loc
, state
, "doubles cannot begin at "
3513 "component 1 or 3");
3515 var
->data
.explicit_component
= true;
3516 var
->data
.location_frac
= qual_component
;
3520 } else if (qual
->flags
.q
.explicit_index
) {
3521 if (!qual
->subroutine_list
)
3522 _mesa_glsl_error(loc
, state
,
3523 "explicit index requires explicit location");
3524 } else if (qual
->flags
.q
.explicit_component
) {
3525 _mesa_glsl_error(loc
, state
,
3526 "explicit component requires explicit location");
3529 if (qual
->flags
.q
.explicit_binding
) {
3530 apply_explicit_binding(state
, loc
, var
, var
->type
, qual
);
3533 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
3534 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
3535 unsigned qual_stream
;
3536 if (process_qualifier_constant(state
, loc
, "stream", qual
->stream
,
3538 validate_stream_qualifier(loc
, state
, qual_stream
)) {
3539 var
->data
.stream
= qual_stream
;
3543 if (qual
->flags
.q
.out
&& qual
->flags
.q
.xfb_buffer
) {
3544 unsigned qual_xfb_buffer
;
3545 if (process_qualifier_constant(state
, loc
, "xfb_buffer",
3546 qual
->xfb_buffer
, &qual_xfb_buffer
) &&
3547 validate_xfb_buffer_qualifier(loc
, state
, qual_xfb_buffer
)) {
3548 var
->data
.xfb_buffer
= qual_xfb_buffer
;
3549 if (qual
->flags
.q
.explicit_xfb_buffer
)
3550 var
->data
.explicit_xfb_buffer
= true;
3554 if (qual
->flags
.q
.explicit_xfb_offset
) {
3555 unsigned qual_xfb_offset
;
3556 unsigned component_size
= var
->type
->contains_double() ? 8 : 4;
3558 if (process_qualifier_constant(state
, loc
, "xfb_offset",
3559 qual
->offset
, &qual_xfb_offset
) &&
3560 validate_xfb_offset_qualifier(loc
, state
, (int) qual_xfb_offset
,
3561 var
->type
, component_size
)) {
3562 var
->data
.offset
= qual_xfb_offset
;
3563 var
->data
.explicit_xfb_offset
= true;
3567 if (qual
->flags
.q
.explicit_xfb_stride
) {
3568 unsigned qual_xfb_stride
;
3569 if (process_qualifier_constant(state
, loc
, "xfb_stride",
3570 qual
->xfb_stride
, &qual_xfb_stride
)) {
3571 var
->data
.xfb_stride
= qual_xfb_stride
;
3572 var
->data
.explicit_xfb_stride
= true;
3576 if (var
->type
->contains_atomic()) {
3577 if (var
->data
.mode
== ir_var_uniform
) {
3578 if (var
->data
.explicit_binding
) {
3580 &state
->atomic_counter_offsets
[var
->data
.binding
];
3582 if (*offset
% ATOMIC_COUNTER_SIZE
)
3583 _mesa_glsl_error(loc
, state
,
3584 "misaligned atomic counter offset");
3586 var
->data
.offset
= *offset
;
3587 *offset
+= var
->type
->atomic_size();
3590 _mesa_glsl_error(loc
, state
,
3591 "atomic counters require explicit binding point");
3593 } else if (var
->data
.mode
!= ir_var_function_in
) {
3594 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
3595 "function parameters or uniform-qualified "
3596 "global variables");
3600 if (var
->type
->contains_sampler()) {
3601 if (var
->data
.mode
!= ir_var_uniform
&&
3602 var
->data
.mode
!= ir_var_function_in
) {
3603 _mesa_glsl_error(loc
, state
, "sampler variables may only be declared "
3604 "as function parameters or uniform-qualified "
3605 "global variables");
3609 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
3610 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
3611 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
3612 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
3613 * These extensions and all following extensions that add the 'layout'
3614 * keyword have been modified to require the use of 'in' or 'out'.
3616 * The following extension do not allow the deprecated keywords:
3618 * GL_AMD_conservative_depth
3619 * GL_ARB_conservative_depth
3620 * GL_ARB_gpu_shader5
3621 * GL_ARB_separate_shader_objects
3622 * GL_ARB_tessellation_shader
3623 * GL_ARB_transform_feedback3
3624 * GL_ARB_uniform_buffer_object
3626 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
3627 * allow layout with the deprecated keywords.
3629 const bool relaxed_layout_qualifier_checking
=
3630 state
->ARB_fragment_coord_conventions_enable
;
3632 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3633 || qual
->flags
.q
.varying
;
3634 if (qual
->has_layout() && uses_deprecated_qualifier
) {
3635 if (relaxed_layout_qualifier_checking
) {
3636 _mesa_glsl_warning(loc
, state
,
3637 "`layout' qualifier may not be used with "
3638 "`attribute' or `varying'");
3640 _mesa_glsl_error(loc
, state
,
3641 "`layout' qualifier may not be used with "
3642 "`attribute' or `varying'");
3646 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
3647 * AMD_conservative_depth.
3649 if (qual
->flags
.q
.depth_type
3650 && !state
->is_version(420, 0)
3651 && !state
->AMD_conservative_depth_enable
3652 && !state
->ARB_conservative_depth_enable
) {
3653 _mesa_glsl_error(loc
, state
,
3654 "extension GL_AMD_conservative_depth or "
3655 "GL_ARB_conservative_depth must be enabled "
3656 "to use depth layout qualifiers");
3657 } else if (qual
->flags
.q
.depth_type
3658 && strcmp(var
->name
, "gl_FragDepth") != 0) {
3659 _mesa_glsl_error(loc
, state
,
3660 "depth layout qualifiers can be applied only to "
3664 switch (qual
->depth_type
) {
3666 var
->data
.depth_layout
= ir_depth_layout_any
;
3668 case ast_depth_greater
:
3669 var
->data
.depth_layout
= ir_depth_layout_greater
;
3671 case ast_depth_less
:
3672 var
->data
.depth_layout
= ir_depth_layout_less
;
3674 case ast_depth_unchanged
:
3675 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
3678 var
->data
.depth_layout
= ir_depth_layout_none
;
3682 if (qual
->flags
.q
.std140
||
3683 qual
->flags
.q
.std430
||
3684 qual
->flags
.q
.packed
||
3685 qual
->flags
.q
.shared
) {
3686 _mesa_glsl_error(loc
, state
,
3687 "uniform and shader storage block layout qualifiers "
3688 "std140, std430, packed, and shared can only be "
3689 "applied to uniform or shader storage blocks, not "
3693 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
3694 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
3697 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
3700 * "Fragment shaders also allow the following layout qualifier on in only
3701 * (not with variable declarations)
3702 * layout-qualifier-id
3703 * early_fragment_tests
3706 if (qual
->flags
.q
.early_fragment_tests
) {
3707 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
3708 "valid in fragment shader input layout declaration.");
3711 if (qual
->flags
.q
.inner_coverage
) {
3712 _mesa_glsl_error(loc
, state
, "inner_coverage layout qualifier only "
3713 "valid in fragment shader input layout declaration.");
3716 if (qual
->flags
.q
.post_depth_coverage
) {
3717 _mesa_glsl_error(loc
, state
, "post_depth_coverage layout qualifier only "
3718 "valid in fragment shader input layout declaration.");
3723 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
3725 struct _mesa_glsl_parse_state
*state
,
3729 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
3731 if (qual
->flags
.q
.invariant
) {
3732 if (var
->data
.used
) {
3733 _mesa_glsl_error(loc
, state
,
3734 "variable `%s' may not be redeclared "
3735 "`invariant' after being used",
3738 var
->data
.invariant
= 1;
3742 if (qual
->flags
.q
.precise
) {
3743 if (var
->data
.used
) {
3744 _mesa_glsl_error(loc
, state
,
3745 "variable `%s' may not be redeclared "
3746 "`precise' after being used",
3749 var
->data
.precise
= 1;
3753 if (qual
->is_subroutine_decl() && !qual
->flags
.q
.uniform
) {
3754 _mesa_glsl_error(loc
, state
,
3755 "`subroutine' may only be applied to uniforms, "
3756 "subroutine type declarations, or function definitions");
3759 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
3760 || qual
->flags
.q
.uniform
3761 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3762 var
->data
.read_only
= 1;
3764 if (qual
->flags
.q
.centroid
)
3765 var
->data
.centroid
= 1;
3767 if (qual
->flags
.q
.sample
)
3768 var
->data
.sample
= 1;
3770 /* Precision qualifiers do not hold any meaning in Desktop GLSL */
3771 if (state
->es_shader
) {
3772 var
->data
.precision
=
3773 select_gles_precision(qual
->precision
, var
->type
, state
, loc
);
3776 if (qual
->flags
.q
.patch
)
3777 var
->data
.patch
= 1;
3779 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
3780 var
->type
= glsl_type::error_type
;
3781 _mesa_glsl_error(loc
, state
,
3782 "`attribute' variables may not be declared in the "
3784 _mesa_shader_stage_to_string(state
->stage
));
3787 /* Disallow layout qualifiers which may only appear on layout declarations. */
3788 if (qual
->flags
.q
.prim_type
) {
3789 _mesa_glsl_error(loc
, state
,
3790 "Primitive type may only be specified on GS input or output "
3791 "layout declaration, not on variables.");
3794 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
3796 * "However, the const qualifier cannot be used with out or inout."
3798 * The same section of the GLSL 4.40 spec further clarifies this saying:
3800 * "The const qualifier cannot be used with out or inout, or a
3801 * compile-time error results."
3803 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
3804 _mesa_glsl_error(loc
, state
,
3805 "`const' may not be applied to `out' or `inout' "
3806 "function parameters");
3809 /* If there is no qualifier that changes the mode of the variable, leave
3810 * the setting alone.
3812 assert(var
->data
.mode
!= ir_var_temporary
);
3813 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
3814 var
->data
.mode
= is_parameter
? ir_var_function_inout
: ir_var_shader_out
;
3815 else if (qual
->flags
.q
.in
)
3816 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
3817 else if (qual
->flags
.q
.attribute
3818 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
3819 var
->data
.mode
= ir_var_shader_in
;
3820 else if (qual
->flags
.q
.out
)
3821 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
3822 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
3823 var
->data
.mode
= ir_var_shader_out
;
3824 else if (qual
->flags
.q
.uniform
)
3825 var
->data
.mode
= ir_var_uniform
;
3826 else if (qual
->flags
.q
.buffer
)
3827 var
->data
.mode
= ir_var_shader_storage
;
3828 else if (qual
->flags
.q
.shared_storage
)
3829 var
->data
.mode
= ir_var_shader_shared
;
3831 var
->data
.fb_fetch_output
= state
->stage
== MESA_SHADER_FRAGMENT
&&
3832 qual
->flags
.q
.in
&& qual
->flags
.q
.out
;
3834 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
3835 /* User-defined ins/outs are not permitted in compute shaders. */
3836 if (state
->stage
== MESA_SHADER_COMPUTE
) {
3837 _mesa_glsl_error(loc
, state
,
3838 "user-defined input and output variables are not "
3839 "permitted in compute shaders");
3842 /* This variable is being used to link data between shader stages (in
3843 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
3844 * that is allowed for such purposes.
3846 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
3848 * "The varying qualifier can be used only with the data types
3849 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
3852 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
3853 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
3855 * "Fragment inputs can only be signed and unsigned integers and
3856 * integer vectors, float, floating-point vectors, matrices, or
3857 * arrays of these. Structures cannot be input.
3859 * Similar text exists in the section on vertex shader outputs.
3861 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
3862 * 3.00 spec allows structs as well. Varying structs are also allowed
3865 switch (var
->type
->get_scalar_type()->base_type
) {
3866 case GLSL_TYPE_FLOAT
:
3867 /* Ok in all GLSL versions */
3869 case GLSL_TYPE_UINT
:
3871 if (state
->is_version(130, 300))
3873 _mesa_glsl_error(loc
, state
,
3874 "varying variables must be of base type float in %s",
3875 state
->get_version_string());
3877 case GLSL_TYPE_STRUCT
:
3878 if (state
->is_version(150, 300))
3880 _mesa_glsl_error(loc
, state
,
3881 "varying variables may not be of type struct");
3883 case GLSL_TYPE_DOUBLE
:
3884 case GLSL_TYPE_UINT64
:
3885 case GLSL_TYPE_INT64
:
3888 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
3893 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
3894 switch (state
->stage
) {
3895 case MESA_SHADER_VERTEX
:
3896 if (var
->data
.mode
== ir_var_shader_out
)
3897 var
->data
.invariant
= true;
3899 case MESA_SHADER_TESS_CTRL
:
3900 case MESA_SHADER_TESS_EVAL
:
3901 case MESA_SHADER_GEOMETRY
:
3902 if ((var
->data
.mode
== ir_var_shader_in
)
3903 || (var
->data
.mode
== ir_var_shader_out
))
3904 var
->data
.invariant
= true;
3906 case MESA_SHADER_FRAGMENT
:
3907 if (var
->data
.mode
== ir_var_shader_in
)
3908 var
->data
.invariant
= true;
3910 case MESA_SHADER_COMPUTE
:
3911 /* Invariance isn't meaningful in compute shaders. */
3916 var
->data
.interpolation
=
3917 interpret_interpolation_qualifier(qual
, var
->type
,
3918 (ir_variable_mode
) var
->data
.mode
,
3921 /* Does the declaration use the deprecated 'attribute' or 'varying'
3924 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
3925 || qual
->flags
.q
.varying
;
3928 /* Validate auxiliary storage qualifiers */
3930 /* From section 4.3.4 of the GLSL 1.30 spec:
3931 * "It is an error to use centroid in in a vertex shader."
3933 * From section 4.3.4 of the GLSL ES 3.00 spec:
3934 * "It is an error to use centroid in or interpolation qualifiers in
3935 * a vertex shader input."
3938 /* Section 4.3.6 of the GLSL 1.30 specification states:
3939 * "It is an error to use centroid out in a fragment shader."
3941 * The GL_ARB_shading_language_420pack extension specification states:
3942 * "It is an error to use auxiliary storage qualifiers or interpolation
3943 * qualifiers on an output in a fragment shader."
3945 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
3946 _mesa_glsl_error(loc
, state
,
3947 "sample qualifier may only be used on `in` or `out` "
3948 "variables between shader stages");
3950 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
3951 _mesa_glsl_error(loc
, state
,
3952 "centroid qualifier may only be used with `in', "
3953 "`out' or `varying' variables between shader stages");
3956 if (qual
->flags
.q
.shared_storage
&& state
->stage
!= MESA_SHADER_COMPUTE
) {
3957 _mesa_glsl_error(loc
, state
,
3958 "the shared storage qualifiers can only be used with "
3962 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
3966 * Get the variable that is being redeclared by this declaration or if it
3967 * does not exist, the current declared variable.
3969 * Semantic checks to verify the validity of the redeclaration are also
3970 * performed. If semantic checks fail, compilation error will be emitted via
3971 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
3974 * A pointer to an existing variable in the current scope if the declaration
3975 * is a redeclaration, current variable otherwise. \c is_declared boolean
3976 * will return \c true if the declaration is a redeclaration, \c false
3979 static ir_variable
*
3980 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
3981 struct _mesa_glsl_parse_state
*state
,
3982 bool allow_all_redeclarations
,
3983 bool *is_redeclaration
)
3985 /* Check if this declaration is actually a re-declaration, either to
3986 * resize an array or add qualifiers to an existing variable.
3988 * This is allowed for variables in the current scope, or when at
3989 * global scope (for built-ins in the implicit outer scope).
3991 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
3992 if (earlier
== NULL
||
3993 (state
->current_function
!= NULL
&&
3994 !state
->symbols
->name_declared_this_scope(var
->name
))) {
3995 *is_redeclaration
= false;
3999 *is_redeclaration
= true;
4001 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
4003 * "It is legal to declare an array without a size and then
4004 * later re-declare the same name as an array of the same
4005 * type and specify a size."
4007 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
4008 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
4009 /* FINISHME: This doesn't match the qualifiers on the two
4010 * FINISHME: declarations. It's not 100% clear whether this is
4011 * FINISHME: required or not.
4014 const int size
= var
->type
->array_size();
4015 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
4016 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
4017 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
4019 earlier
->data
.max_array_access
);
4022 earlier
->type
= var
->type
;
4025 } else if ((state
->ARB_fragment_coord_conventions_enable
||
4026 state
->is_version(150, 0))
4027 && strcmp(var
->name
, "gl_FragCoord") == 0
4028 && earlier
->type
== var
->type
4029 && var
->data
.mode
== ir_var_shader_in
) {
4030 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
4033 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
4034 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
4036 /* According to section 4.3.7 of the GLSL 1.30 spec,
4037 * the following built-in varaibles can be redeclared with an
4038 * interpolation qualifier:
4041 * * gl_FrontSecondaryColor
4042 * * gl_BackSecondaryColor
4044 * * gl_SecondaryColor
4046 } else if (state
->is_version(130, 0)
4047 && (strcmp(var
->name
, "gl_FrontColor") == 0
4048 || strcmp(var
->name
, "gl_BackColor") == 0
4049 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
4050 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
4051 || strcmp(var
->name
, "gl_Color") == 0
4052 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
4053 && earlier
->type
== var
->type
4054 && earlier
->data
.mode
== var
->data
.mode
) {
4055 earlier
->data
.interpolation
= var
->data
.interpolation
;
4057 /* Layout qualifiers for gl_FragDepth. */
4058 } else if ((state
->is_version(420, 0) ||
4059 state
->AMD_conservative_depth_enable
||
4060 state
->ARB_conservative_depth_enable
)
4061 && strcmp(var
->name
, "gl_FragDepth") == 0
4062 && earlier
->type
== var
->type
4063 && earlier
->data
.mode
== var
->data
.mode
) {
4065 /** From the AMD_conservative_depth spec:
4066 * Within any shader, the first redeclarations of gl_FragDepth
4067 * must appear before any use of gl_FragDepth.
4069 if (earlier
->data
.used
) {
4070 _mesa_glsl_error(&loc
, state
,
4071 "the first redeclaration of gl_FragDepth "
4072 "must appear before any use of gl_FragDepth");
4075 /* Prevent inconsistent redeclaration of depth layout qualifier. */
4076 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
4077 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
4078 _mesa_glsl_error(&loc
, state
,
4079 "gl_FragDepth: depth layout is declared here "
4080 "as '%s, but it was previously declared as "
4082 depth_layout_string(var
->data
.depth_layout
),
4083 depth_layout_string(earlier
->data
.depth_layout
));
4086 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
4088 } else if (state
->has_framebuffer_fetch() &&
4089 strcmp(var
->name
, "gl_LastFragData") == 0 &&
4090 var
->type
== earlier
->type
&&
4091 var
->data
.mode
== ir_var_auto
) {
4092 /* According to the EXT_shader_framebuffer_fetch spec:
4094 * "By default, gl_LastFragData is declared with the mediump precision
4095 * qualifier. This can be changed by redeclaring the corresponding
4096 * variables with the desired precision qualifier."
4098 earlier
->data
.precision
= var
->data
.precision
;
4100 } else if (allow_all_redeclarations
) {
4101 if (earlier
->data
.mode
!= var
->data
.mode
) {
4102 _mesa_glsl_error(&loc
, state
,
4103 "redeclaration of `%s' with incorrect qualifiers",
4105 } else if (earlier
->type
!= var
->type
) {
4106 _mesa_glsl_error(&loc
, state
,
4107 "redeclaration of `%s' has incorrect type",
4111 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
4118 * Generate the IR for an initializer in a variable declaration
4121 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
4122 ast_fully_specified_type
*type
,
4123 exec_list
*initializer_instructions
,
4124 struct _mesa_glsl_parse_state
*state
)
4126 ir_rvalue
*result
= NULL
;
4128 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
4130 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
4132 * "All uniform variables are read-only and are initialized either
4133 * directly by an application via API commands, or indirectly by
4136 if (var
->data
.mode
== ir_var_uniform
) {
4137 state
->check_version(120, 0, &initializer_loc
,
4138 "cannot initialize uniform %s",
4142 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4144 * "Buffer variables cannot have initializers."
4146 if (var
->data
.mode
== ir_var_shader_storage
) {
4147 _mesa_glsl_error(&initializer_loc
, state
,
4148 "cannot initialize buffer variable %s",
4152 /* From section 4.1.7 of the GLSL 4.40 spec:
4154 * "Opaque variables [...] are initialized only through the
4155 * OpenGL API; they cannot be declared with an initializer in a
4158 if (var
->type
->contains_opaque()) {
4159 _mesa_glsl_error(&initializer_loc
, state
,
4160 "cannot initialize opaque variable %s",
4164 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
4165 _mesa_glsl_error(&initializer_loc
, state
,
4166 "cannot initialize %s shader input / %s %s",
4167 _mesa_shader_stage_to_string(state
->stage
),
4168 (state
->stage
== MESA_SHADER_VERTEX
)
4169 ? "attribute" : "varying",
4173 if (var
->data
.mode
== ir_var_shader_out
&& state
->current_function
== NULL
) {
4174 _mesa_glsl_error(&initializer_loc
, state
,
4175 "cannot initialize %s shader output %s",
4176 _mesa_shader_stage_to_string(state
->stage
),
4180 /* If the initializer is an ast_aggregate_initializer, recursively store
4181 * type information from the LHS into it, so that its hir() function can do
4184 if (decl
->initializer
->oper
== ast_aggregate
)
4185 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
4187 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
4188 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
4190 /* Calculate the constant value if this is a const or uniform
4193 * Section 4.3 (Storage Qualifiers) of the GLSL ES 1.00.17 spec says:
4195 * "Declarations of globals without a storage qualifier, or with
4196 * just the const qualifier, may include initializers, in which case
4197 * they will be initialized before the first line of main() is
4198 * executed. Such initializers must be a constant expression."
4200 * The same section of the GLSL ES 3.00.4 spec has similar language.
4202 if (type
->qualifier
.flags
.q
.constant
4203 || type
->qualifier
.flags
.q
.uniform
4204 || (state
->es_shader
&& state
->current_function
== NULL
)) {
4205 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
4207 if (new_rhs
!= NULL
) {
4210 /* Section 4.3.3 (Constant Expressions) of the GLSL ES 3.00.4 spec
4213 * "A constant expression is one of
4217 * - an expression formed by an operator on operands that are
4218 * all constant expressions, including getting an element of
4219 * a constant array, or a field of a constant structure, or
4220 * components of a constant vector. However, the sequence
4221 * operator ( , ) and the assignment operators ( =, +=, ...)
4222 * are not included in the operators that can create a
4223 * constant expression."
4225 * Section 12.43 (Sequence operator and constant expressions) says:
4227 * "Should the following construct be allowed?
4231 * The expression within the brackets uses the sequence operator
4232 * (',') and returns the integer 3 so the construct is declaring
4233 * a single-dimensional array of size 3. In some languages, the
4234 * construct declares a two-dimensional array. It would be
4235 * preferable to make this construct illegal to avoid confusion.
4237 * One possibility is to change the definition of the sequence
4238 * operator so that it does not return a constant-expression and
4239 * hence cannot be used to declare an array size.
4241 * RESOLUTION: The result of a sequence operator is not a
4242 * constant-expression."
4244 * Section 4.3.3 (Constant Expressions) of the GLSL 4.30.9 spec
4245 * contains language almost identical to the section 4.3.3 in the
4246 * GLSL ES 3.00.4 spec. This is a new limitation for these GLSL
4249 ir_constant
*constant_value
= rhs
->constant_expression_value();
4250 if (!constant_value
||
4251 (state
->is_version(430, 300) &&
4252 decl
->initializer
->has_sequence_subexpression())) {
4253 const char *const variable_mode
=
4254 (type
->qualifier
.flags
.q
.constant
)
4256 : ((type
->qualifier
.flags
.q
.uniform
) ? "uniform" : "global");
4258 /* If ARB_shading_language_420pack is enabled, initializers of
4259 * const-qualified local variables do not have to be constant
4260 * expressions. Const-qualified global variables must still be
4261 * initialized with constant expressions.
4263 if (!state
->has_420pack()
4264 || state
->current_function
== NULL
) {
4265 _mesa_glsl_error(& initializer_loc
, state
,
4266 "initializer of %s variable `%s' must be a "
4267 "constant expression",
4270 if (var
->type
->is_numeric()) {
4271 /* Reduce cascading errors. */
4272 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4273 ? ir_constant::zero(state
, var
->type
) : NULL
;
4277 rhs
= constant_value
;
4278 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4279 ? constant_value
: NULL
;
4282 if (var
->type
->is_numeric()) {
4283 /* Reduce cascading errors. */
4284 var
->constant_value
= type
->qualifier
.flags
.q
.constant
4285 ? ir_constant::zero(state
, var
->type
) : NULL
;
4290 if (rhs
&& !rhs
->type
->is_error()) {
4291 bool temp
= var
->data
.read_only
;
4292 if (type
->qualifier
.flags
.q
.constant
)
4293 var
->data
.read_only
= false;
4295 /* Never emit code to initialize a uniform.
4297 const glsl_type
*initializer_type
;
4298 if (!type
->qualifier
.flags
.q
.uniform
) {
4299 do_assignment(initializer_instructions
, state
,
4304 type
->get_location());
4305 initializer_type
= result
->type
;
4307 initializer_type
= rhs
->type
;
4309 var
->constant_initializer
= rhs
->constant_expression_value();
4310 var
->data
.has_initializer
= true;
4312 /* If the declared variable is an unsized array, it must inherrit
4313 * its full type from the initializer. A declaration such as
4315 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
4319 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
4321 * The assignment generated in the if-statement (below) will also
4322 * automatically handle this case for non-uniforms.
4324 * If the declared variable is not an array, the types must
4325 * already match exactly. As a result, the type assignment
4326 * here can be done unconditionally. For non-uniforms the call
4327 * to do_assignment can change the type of the initializer (via
4328 * the implicit conversion rules). For uniforms the initializer
4329 * must be a constant expression, and the type of that expression
4330 * was validated above.
4332 var
->type
= initializer_type
;
4334 var
->data
.read_only
= temp
;
4341 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
4342 YYLTYPE loc
, ir_variable
*var
,
4343 unsigned num_vertices
,
4345 const char *var_category
)
4347 if (var
->type
->is_unsized_array()) {
4348 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
4350 * All geometry shader input unsized array declarations will be
4351 * sized by an earlier input layout qualifier, when present, as per
4352 * the following table.
4354 * Followed by a table mapping each allowed input layout qualifier to
4355 * the corresponding input length.
4357 * Similarly for tessellation control shader outputs.
4359 if (num_vertices
!= 0)
4360 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4363 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
4364 * includes the following examples of compile-time errors:
4366 * // code sequence within one shader...
4367 * in vec4 Color1[]; // size unknown
4368 * ...Color1.length()...// illegal, length() unknown
4369 * in vec4 Color2[2]; // size is 2
4370 * ...Color1.length()...// illegal, Color1 still has no size
4371 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
4372 * layout(lines) in; // legal, input size is 2, matching
4373 * in vec4 Color4[3]; // illegal, contradicts layout
4376 * To detect the case illustrated by Color3, we verify that the size of
4377 * an explicitly-sized array matches the size of any previously declared
4378 * explicitly-sized array. To detect the case illustrated by Color4, we
4379 * verify that the size of an explicitly-sized array is consistent with
4380 * any previously declared input layout.
4382 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
4383 _mesa_glsl_error(&loc
, state
,
4384 "%s size contradicts previously declared layout "
4385 "(size is %u, but layout requires a size of %u)",
4386 var_category
, var
->type
->length
, num_vertices
);
4387 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
4388 _mesa_glsl_error(&loc
, state
,
4389 "%s sizes are inconsistent (size is %u, but a "
4390 "previous declaration has size %u)",
4391 var_category
, var
->type
->length
, *size
);
4393 *size
= var
->type
->length
;
4399 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
4400 YYLTYPE loc
, ir_variable
*var
)
4402 unsigned num_vertices
= 0;
4404 if (state
->tcs_output_vertices_specified
) {
4405 if (!state
->out_qualifier
->vertices
->
4406 process_qualifier_constant(state
, "vertices",
4407 &num_vertices
, false)) {
4411 if (num_vertices
> state
->Const
.MaxPatchVertices
) {
4412 _mesa_glsl_error(&loc
, state
, "vertices (%d) exceeds "
4413 "GL_MAX_PATCH_VERTICES", num_vertices
);
4418 if (!var
->type
->is_array() && !var
->data
.patch
) {
4419 _mesa_glsl_error(&loc
, state
,
4420 "tessellation control shader outputs must be arrays");
4422 /* To avoid cascading failures, short circuit the checks below. */
4426 if (var
->data
.patch
)
4429 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4430 &state
->tcs_output_size
,
4431 "tessellation control shader output");
4435 * Do additional processing necessary for tessellation control/evaluation shader
4436 * input declarations. This covers both interface block arrays and bare input
4440 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4441 YYLTYPE loc
, ir_variable
*var
)
4443 if (!var
->type
->is_array() && !var
->data
.patch
) {
4444 _mesa_glsl_error(&loc
, state
,
4445 "per-vertex tessellation shader inputs must be arrays");
4446 /* Avoid cascading failures. */
4450 if (var
->data
.patch
)
4453 /* The ARB_tessellation_shader spec says:
4455 * "Declaring an array size is optional. If no size is specified, it
4456 * will be taken from the implementation-dependent maximum patch size
4457 * (gl_MaxPatchVertices). If a size is specified, it must match the
4458 * maximum patch size; otherwise, a compile or link error will occur."
4460 * This text appears twice, once for TCS inputs, and again for TES inputs.
4462 if (var
->type
->is_unsized_array()) {
4463 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
4464 state
->Const
.MaxPatchVertices
);
4465 } else if (var
->type
->length
!= state
->Const
.MaxPatchVertices
) {
4466 _mesa_glsl_error(&loc
, state
,
4467 "per-vertex tessellation shader input arrays must be "
4468 "sized to gl_MaxPatchVertices (%d).",
4469 state
->Const
.MaxPatchVertices
);
4475 * Do additional processing necessary for geometry shader input declarations
4476 * (this covers both interface blocks arrays and bare input variables).
4479 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
4480 YYLTYPE loc
, ir_variable
*var
)
4482 unsigned num_vertices
= 0;
4484 if (state
->gs_input_prim_type_specified
) {
4485 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
4488 /* Geometry shader input variables must be arrays. Caller should have
4489 * reported an error for this.
4491 if (!var
->type
->is_array()) {
4492 assert(state
->error
);
4494 /* To avoid cascading failures, short circuit the checks below. */
4498 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
4499 &state
->gs_input_size
,
4500 "geometry shader input");
4504 validate_identifier(const char *identifier
, YYLTYPE loc
,
4505 struct _mesa_glsl_parse_state
*state
)
4507 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
4509 * "Identifiers starting with "gl_" are reserved for use by
4510 * OpenGL, and may not be declared in a shader as either a
4511 * variable or a function."
4513 if (is_gl_identifier(identifier
)) {
4514 _mesa_glsl_error(&loc
, state
,
4515 "identifier `%s' uses reserved `gl_' prefix",
4517 } else if (strstr(identifier
, "__")) {
4518 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
4521 * "In addition, all identifiers containing two
4522 * consecutive underscores (__) are reserved as
4523 * possible future keywords."
4525 * The intention is that names containing __ are reserved for internal
4526 * use by the implementation, and names prefixed with GL_ are reserved
4527 * for use by Khronos. Names simply containing __ are dangerous to use,
4528 * but should be allowed.
4530 * A future version of the GLSL specification will clarify this.
4532 _mesa_glsl_warning(&loc
, state
,
4533 "identifier `%s' uses reserved `__' string",
4539 ast_declarator_list::hir(exec_list
*instructions
,
4540 struct _mesa_glsl_parse_state
*state
)
4543 const struct glsl_type
*decl_type
;
4544 const char *type_name
= NULL
;
4545 ir_rvalue
*result
= NULL
;
4546 YYLTYPE loc
= this->get_location();
4548 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
4550 * "To ensure that a particular output variable is invariant, it is
4551 * necessary to use the invariant qualifier. It can either be used to
4552 * qualify a previously declared variable as being invariant
4554 * invariant gl_Position; // make existing gl_Position be invariant"
4556 * In these cases the parser will set the 'invariant' flag in the declarator
4557 * list, and the type will be NULL.
4559 if (this->invariant
) {
4560 assert(this->type
== NULL
);
4562 if (state
->current_function
!= NULL
) {
4563 _mesa_glsl_error(& loc
, state
,
4564 "all uses of `invariant' keyword must be at global "
4568 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4569 assert(decl
->array_specifier
== NULL
);
4570 assert(decl
->initializer
== NULL
);
4572 ir_variable
*const earlier
=
4573 state
->symbols
->get_variable(decl
->identifier
);
4574 if (earlier
== NULL
) {
4575 _mesa_glsl_error(& loc
, state
,
4576 "undeclared variable `%s' cannot be marked "
4577 "invariant", decl
->identifier
);
4578 } else if (!is_allowed_invariant(earlier
, state
)) {
4579 _mesa_glsl_error(&loc
, state
,
4580 "`%s' cannot be marked invariant; interfaces between "
4581 "shader stages only.", decl
->identifier
);
4582 } else if (earlier
->data
.used
) {
4583 _mesa_glsl_error(& loc
, state
,
4584 "variable `%s' may not be redeclared "
4585 "`invariant' after being used",
4588 earlier
->data
.invariant
= true;
4592 /* Invariant redeclarations do not have r-values.
4597 if (this->precise
) {
4598 assert(this->type
== NULL
);
4600 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4601 assert(decl
->array_specifier
== NULL
);
4602 assert(decl
->initializer
== NULL
);
4604 ir_variable
*const earlier
=
4605 state
->symbols
->get_variable(decl
->identifier
);
4606 if (earlier
== NULL
) {
4607 _mesa_glsl_error(& loc
, state
,
4608 "undeclared variable `%s' cannot be marked "
4609 "precise", decl
->identifier
);
4610 } else if (state
->current_function
!= NULL
&&
4611 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
4612 /* Note: we have to check if we're in a function, since
4613 * builtins are treated as having come from another scope.
4615 _mesa_glsl_error(& loc
, state
,
4616 "variable `%s' from an outer scope may not be "
4617 "redeclared `precise' in this scope",
4619 } else if (earlier
->data
.used
) {
4620 _mesa_glsl_error(& loc
, state
,
4621 "variable `%s' may not be redeclared "
4622 "`precise' after being used",
4625 earlier
->data
.precise
= true;
4629 /* Precise redeclarations do not have r-values either. */
4633 assert(this->type
!= NULL
);
4634 assert(!this->invariant
);
4635 assert(!this->precise
);
4637 /* The type specifier may contain a structure definition. Process that
4638 * before any of the variable declarations.
4640 (void) this->type
->specifier
->hir(instructions
, state
);
4642 decl_type
= this->type
->glsl_type(& type_name
, state
);
4644 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
4645 * "Buffer variables may only be declared inside interface blocks
4646 * (section 4.3.9 “Interface Blocks”), which are then referred to as
4647 * shader storage blocks. It is a compile-time error to declare buffer
4648 * variables at global scope (outside a block)."
4650 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
4651 _mesa_glsl_error(&loc
, state
,
4652 "buffer variables cannot be declared outside "
4653 "interface blocks");
4656 /* An offset-qualified atomic counter declaration sets the default
4657 * offset for the next declaration within the same atomic counter
4660 if (decl_type
&& decl_type
->contains_atomic()) {
4661 if (type
->qualifier
.flags
.q
.explicit_binding
&&
4662 type
->qualifier
.flags
.q
.explicit_offset
) {
4663 unsigned qual_binding
;
4664 unsigned qual_offset
;
4665 if (process_qualifier_constant(state
, &loc
, "binding",
4666 type
->qualifier
.binding
,
4668 && process_qualifier_constant(state
, &loc
, "offset",
4669 type
->qualifier
.offset
,
4671 state
->atomic_counter_offsets
[qual_binding
] = qual_offset
;
4675 ast_type_qualifier allowed_atomic_qual_mask
;
4676 allowed_atomic_qual_mask
.flags
.i
= 0;
4677 allowed_atomic_qual_mask
.flags
.q
.explicit_binding
= 1;
4678 allowed_atomic_qual_mask
.flags
.q
.explicit_offset
= 1;
4679 allowed_atomic_qual_mask
.flags
.q
.uniform
= 1;
4681 type
->qualifier
.validate_flags(&loc
, state
, allowed_atomic_qual_mask
,
4682 "invalid layout qualifier for",
4686 if (this->declarations
.is_empty()) {
4687 /* If there is no structure involved in the program text, there are two
4688 * possible scenarios:
4690 * - The program text contained something like 'vec4;'. This is an
4691 * empty declaration. It is valid but weird. Emit a warning.
4693 * - The program text contained something like 'S;' and 'S' is not the
4694 * name of a known structure type. This is both invalid and weird.
4697 * - The program text contained something like 'mediump float;'
4698 * when the programmer probably meant 'precision mediump
4699 * float;' Emit a warning with a description of what they
4700 * probably meant to do.
4702 * Note that if decl_type is NULL and there is a structure involved,
4703 * there must have been some sort of error with the structure. In this
4704 * case we assume that an error was already generated on this line of
4705 * code for the structure. There is no need to generate an additional,
4708 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
4711 if (decl_type
== NULL
) {
4712 _mesa_glsl_error(&loc
, state
,
4713 "invalid type `%s' in empty declaration",
4716 if (decl_type
->base_type
== GLSL_TYPE_ARRAY
) {
4717 /* From Section 13.22 (Array Declarations) of the GLSL ES 3.2
4720 * "... any declaration that leaves the size undefined is
4721 * disallowed as this would add complexity and there are no
4724 if (state
->es_shader
&& decl_type
->is_unsized_array()) {
4725 _mesa_glsl_error(&loc
, state
, "array size must be explicitly "
4726 "or implicitly defined");
4729 /* From Section 4.12 (Empty Declarations) of the GLSL 4.5 spec:
4731 * "The combinations of types and qualifiers that cause
4732 * compile-time or link-time errors are the same whether or not
4733 * the declaration is empty."
4735 validate_array_dimensions(decl_type
, state
, &loc
);
4738 if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
4739 /* Empty atomic counter declarations are allowed and useful
4740 * to set the default offset qualifier.
4743 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4744 if (this->type
->specifier
->structure
!= NULL
) {
4745 _mesa_glsl_error(&loc
, state
,
4746 "precision qualifiers can't be applied "
4749 static const char *const precision_names
[] = {
4756 _mesa_glsl_warning(&loc
, state
,
4757 "empty declaration with precision "
4758 "qualifier, to set the default precision, "
4759 "use `precision %s %s;'",
4760 precision_names
[this->type
->
4761 qualifier
.precision
],
4764 } else if (this->type
->specifier
->structure
== NULL
) {
4765 _mesa_glsl_warning(&loc
, state
, "empty declaration");
4770 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
4771 const struct glsl_type
*var_type
;
4773 const char *identifier
= decl
->identifier
;
4774 /* FINISHME: Emit a warning if a variable declaration shadows a
4775 * FINISHME: declaration at a higher scope.
4778 if ((decl_type
== NULL
) || decl_type
->is_void()) {
4779 if (type_name
!= NULL
) {
4780 _mesa_glsl_error(& loc
, state
,
4781 "invalid type `%s' in declaration of `%s'",
4782 type_name
, decl
->identifier
);
4784 _mesa_glsl_error(& loc
, state
,
4785 "invalid type in declaration of `%s'",
4791 if (this->type
->qualifier
.is_subroutine_decl()) {
4795 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
4797 _mesa_glsl_error(& loc
, state
,
4798 "invalid type in declaration of `%s'",
4800 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
4805 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
4808 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
4810 /* The 'varying in' and 'varying out' qualifiers can only be used with
4811 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
4814 if (this->type
->qualifier
.flags
.q
.varying
) {
4815 if (this->type
->qualifier
.flags
.q
.in
) {
4816 _mesa_glsl_error(& loc
, state
,
4817 "`varying in' qualifier in declaration of "
4818 "`%s' only valid for geometry shaders using "
4819 "ARB_geometry_shader4 or EXT_geometry_shader4",
4821 } else if (this->type
->qualifier
.flags
.q
.out
) {
4822 _mesa_glsl_error(& loc
, state
,
4823 "`varying out' qualifier in declaration of "
4824 "`%s' only valid for geometry shaders using "
4825 "ARB_geometry_shader4 or EXT_geometry_shader4",
4830 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
4832 * "Global variables can only use the qualifiers const,
4833 * attribute, uniform, or varying. Only one may be
4836 * Local variables can only use the qualifier const."
4838 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
4839 * any extension that adds the 'layout' keyword.
4841 if (!state
->is_version(130, 300)
4842 && !state
->has_explicit_attrib_location()
4843 && !state
->has_separate_shader_objects()
4844 && !state
->ARB_fragment_coord_conventions_enable
) {
4845 if (this->type
->qualifier
.flags
.q
.out
) {
4846 _mesa_glsl_error(& loc
, state
,
4847 "`out' qualifier in declaration of `%s' "
4848 "only valid for function parameters in %s",
4849 decl
->identifier
, state
->get_version_string());
4851 if (this->type
->qualifier
.flags
.q
.in
) {
4852 _mesa_glsl_error(& loc
, state
,
4853 "`in' qualifier in declaration of `%s' "
4854 "only valid for function parameters in %s",
4855 decl
->identifier
, state
->get_version_string());
4857 /* FINISHME: Test for other invalid qualifiers. */
4860 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
4862 apply_layout_qualifier_to_variable(&this->type
->qualifier
, var
, state
,
4865 if ((var
->data
.mode
== ir_var_auto
|| var
->data
.mode
== ir_var_temporary
)
4866 && (var
->type
->is_numeric() || var
->type
->is_boolean())
4867 && state
->zero_init
) {
4868 const ir_constant_data data
= { { 0 } };
4869 var
->data
.has_initializer
= true;
4870 var
->constant_initializer
= new(var
) ir_constant(var
->type
, &data
);
4873 if (this->type
->qualifier
.flags
.q
.invariant
) {
4874 if (!is_allowed_invariant(var
, state
)) {
4875 _mesa_glsl_error(&loc
, state
,
4876 "`%s' cannot be marked invariant; interfaces between "
4877 "shader stages only", var
->name
);
4881 if (state
->current_function
!= NULL
) {
4882 const char *mode
= NULL
;
4883 const char *extra
= "";
4885 /* There is no need to check for 'inout' here because the parser will
4886 * only allow that in function parameter lists.
4888 if (this->type
->qualifier
.flags
.q
.attribute
) {
4890 } else if (this->type
->qualifier
.is_subroutine_decl()) {
4891 mode
= "subroutine uniform";
4892 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
4894 } else if (this->type
->qualifier
.flags
.q
.varying
) {
4896 } else if (this->type
->qualifier
.flags
.q
.in
) {
4898 extra
= " or in function parameter list";
4899 } else if (this->type
->qualifier
.flags
.q
.out
) {
4901 extra
= " or in function parameter list";
4905 _mesa_glsl_error(& loc
, state
,
4906 "%s variable `%s' must be declared at "
4908 mode
, var
->name
, extra
);
4910 } else if (var
->data
.mode
== ir_var_shader_in
) {
4911 var
->data
.read_only
= true;
4913 if (state
->stage
== MESA_SHADER_VERTEX
) {
4914 bool error_emitted
= false;
4916 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
4918 * "Vertex shader inputs can only be float, floating-point
4919 * vectors, matrices, signed and unsigned integers and integer
4920 * vectors. Vertex shader inputs can also form arrays of these
4921 * types, but not structures."
4923 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
4925 * "Vertex shader inputs can only be float, floating-point
4926 * vectors, matrices, signed and unsigned integers and integer
4927 * vectors. They cannot be arrays or structures."
4929 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
4931 * "The attribute qualifier can be used only with float,
4932 * floating-point vectors, and matrices. Attribute variables
4933 * cannot be declared as arrays or structures."
4935 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
4937 * "Vertex shader inputs can only be float, floating-point
4938 * vectors, matrices, signed and unsigned integers and integer
4939 * vectors. Vertex shader inputs cannot be arrays or
4942 const glsl_type
*check_type
= var
->type
->without_array();
4944 switch (check_type
->base_type
) {
4945 case GLSL_TYPE_FLOAT
:
4947 case GLSL_TYPE_UINT64
:
4948 case GLSL_TYPE_INT64
:
4950 case GLSL_TYPE_UINT
:
4952 if (state
->is_version(120, 300))
4954 case GLSL_TYPE_DOUBLE
:
4955 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
4959 _mesa_glsl_error(& loc
, state
,
4960 "vertex shader input / attribute cannot have "
4962 var
->type
->is_array() ? "array of " : "",
4964 error_emitted
= true;
4967 if (!error_emitted
&& var
->type
->is_array() &&
4968 !state
->check_version(150, 0, &loc
,
4969 "vertex shader input / attribute "
4970 "cannot have array type")) {
4971 error_emitted
= true;
4973 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
4974 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
4976 * Geometry shader input variables get the per-vertex values
4977 * written out by vertex shader output variables of the same
4978 * names. Since a geometry shader operates on a set of
4979 * vertices, each input varying variable (or input block, see
4980 * interface blocks below) needs to be declared as an array.
4982 if (!var
->type
->is_array()) {
4983 _mesa_glsl_error(&loc
, state
,
4984 "geometry shader inputs must be arrays");
4987 handle_geometry_shader_input_decl(state
, loc
, var
);
4988 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
4989 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
4991 * It is a compile-time error to declare a fragment shader
4992 * input with, or that contains, any of the following types:
4996 * * An array of arrays
4997 * * An array of structures
4998 * * A structure containing an array
4999 * * A structure containing a structure
5001 if (state
->es_shader
) {
5002 const glsl_type
*check_type
= var
->type
->without_array();
5003 if (check_type
->is_boolean() ||
5004 check_type
->contains_opaque()) {
5005 _mesa_glsl_error(&loc
, state
,
5006 "fragment shader input cannot have type %s",
5009 if (var
->type
->is_array() &&
5010 var
->type
->fields
.array
->is_array()) {
5011 _mesa_glsl_error(&loc
, state
,
5013 "cannot have an array of arrays",
5014 _mesa_shader_stage_to_string(state
->stage
));
5016 if (var
->type
->is_array() &&
5017 var
->type
->fields
.array
->is_record()) {
5018 _mesa_glsl_error(&loc
, state
,
5019 "fragment shader input "
5020 "cannot have an array of structs");
5022 if (var
->type
->is_record()) {
5023 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
5024 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
5025 var
->type
->fields
.structure
[i
].type
->is_record())
5026 _mesa_glsl_error(&loc
, state
,
5027 "fragement shader input cannot have "
5028 "a struct that contains an "
5033 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
5034 state
->stage
== MESA_SHADER_TESS_EVAL
) {
5035 handle_tess_shader_input_decl(state
, loc
, var
);
5037 } else if (var
->data
.mode
== ir_var_shader_out
) {
5038 const glsl_type
*check_type
= var
->type
->without_array();
5040 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5042 * It is a compile-time error to declare a vertex, tessellation
5043 * evaluation, tessellation control, or geometry shader output
5044 * that contains any of the following:
5046 * * A Boolean type (bool, bvec2 ...)
5049 if (check_type
->is_boolean() || check_type
->contains_opaque())
5050 _mesa_glsl_error(&loc
, state
,
5051 "%s shader output cannot have type %s",
5052 _mesa_shader_stage_to_string(state
->stage
),
5055 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
5057 * It is a compile-time error to declare a fragment shader output
5058 * that contains any of the following:
5060 * * A Boolean type (bool, bvec2 ...)
5061 * * A double-precision scalar or vector (double, dvec2 ...)
5066 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
5067 if (check_type
->is_record() || check_type
->is_matrix())
5068 _mesa_glsl_error(&loc
, state
,
5069 "fragment shader output "
5070 "cannot have struct or matrix type");
5071 switch (check_type
->base_type
) {
5072 case GLSL_TYPE_UINT
:
5074 case GLSL_TYPE_FLOAT
:
5077 _mesa_glsl_error(&loc
, state
,
5078 "fragment shader output cannot have "
5079 "type %s", check_type
->name
);
5083 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
5085 * It is a compile-time error to declare a vertex shader output
5086 * with, or that contains, any of the following types:
5090 * * An array of arrays
5091 * * An array of structures
5092 * * A structure containing an array
5093 * * A structure containing a structure
5095 * It is a compile-time error to declare a fragment shader output
5096 * with, or that contains, any of the following types:
5102 * * An array of array
5104 * ES 3.20 updates this to apply to tessellation and geometry shaders
5105 * as well. Because there are per-vertex arrays in the new stages,
5106 * it strikes the "array of..." rules and replaces them with these:
5108 * * For per-vertex-arrayed variables (applies to tessellation
5109 * control, tessellation evaluation and geometry shaders):
5111 * * Per-vertex-arrayed arrays of arrays
5112 * * Per-vertex-arrayed arrays of structures
5114 * * For non-per-vertex-arrayed variables:
5116 * * An array of arrays
5117 * * An array of structures
5119 * which basically says to unwrap the per-vertex aspect and apply
5122 if (state
->es_shader
) {
5123 if (var
->type
->is_array() &&
5124 var
->type
->fields
.array
->is_array()) {
5125 _mesa_glsl_error(&loc
, state
,
5127 "cannot have an array of arrays",
5128 _mesa_shader_stage_to_string(state
->stage
));
5130 if (state
->stage
<= MESA_SHADER_GEOMETRY
) {
5131 const glsl_type
*type
= var
->type
;
5133 if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
5134 !var
->data
.patch
&& var
->type
->is_array()) {
5135 type
= var
->type
->fields
.array
;
5138 if (type
->is_array() && type
->fields
.array
->is_record()) {
5139 _mesa_glsl_error(&loc
, state
,
5140 "%s shader output cannot have "
5141 "an array of structs",
5142 _mesa_shader_stage_to_string(state
->stage
));
5144 if (type
->is_record()) {
5145 for (unsigned i
= 0; i
< type
->length
; i
++) {
5146 if (type
->fields
.structure
[i
].type
->is_array() ||
5147 type
->fields
.structure
[i
].type
->is_record())
5148 _mesa_glsl_error(&loc
, state
,
5149 "%s shader output cannot have a "
5150 "struct that contains an "
5152 _mesa_shader_stage_to_string(state
->stage
));
5158 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
5159 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
5161 } else if (var
->type
->contains_subroutine()) {
5162 /* declare subroutine uniforms as hidden */
5163 var
->data
.how_declared
= ir_var_hidden
;
5166 /* From section 4.3.4 of the GLSL 4.00 spec:
5167 * "Input variables may not be declared using the patch in qualifier
5168 * in tessellation control or geometry shaders."
5170 * From section 4.3.6 of the GLSL 4.00 spec:
5171 * "It is an error to use patch out in a vertex, tessellation
5172 * evaluation, or geometry shader."
5174 * This doesn't explicitly forbid using them in a fragment shader, but
5175 * that's probably just an oversight.
5177 if (state
->stage
!= MESA_SHADER_TESS_EVAL
5178 && this->type
->qualifier
.flags
.q
.patch
5179 && this->type
->qualifier
.flags
.q
.in
) {
5181 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
5182 "tessellation evaluation shader");
5185 if (state
->stage
!= MESA_SHADER_TESS_CTRL
5186 && this->type
->qualifier
.flags
.q
.patch
5187 && this->type
->qualifier
.flags
.q
.out
) {
5189 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
5190 "tessellation control shader");
5193 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
5195 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
5196 state
->check_precision_qualifiers_allowed(&loc
);
5199 if (this->type
->qualifier
.precision
!= ast_precision_none
&&
5200 !precision_qualifier_allowed(var
->type
)) {
5201 _mesa_glsl_error(&loc
, state
,
5202 "precision qualifiers apply only to floating point"
5203 ", integer and opaque types");
5206 /* From section 4.1.7 of the GLSL 4.40 spec:
5208 * "[Opaque types] can only be declared as function
5209 * parameters or uniform-qualified variables."
5211 if (var_type
->contains_opaque() &&
5212 !this->type
->qualifier
.flags
.q
.uniform
) {
5213 _mesa_glsl_error(&loc
, state
,
5214 "opaque variables must be declared uniform");
5217 /* Process the initializer and add its instructions to a temporary
5218 * list. This list will be added to the instruction stream (below) after
5219 * the declaration is added. This is done because in some cases (such as
5220 * redeclarations) the declaration may not actually be added to the
5221 * instruction stream.
5223 exec_list initializer_instructions
;
5225 /* Examine var name here since var may get deleted in the next call */
5226 bool var_is_gl_id
= is_gl_identifier(var
->name
);
5228 bool is_redeclaration
;
5229 ir_variable
*declared_var
=
5230 get_variable_being_redeclared(var
, decl
->get_location(), state
,
5231 false /* allow_all_redeclarations */,
5233 if (is_redeclaration
) {
5235 declared_var
->data
.how_declared
== ir_var_declared_in_block
) {
5236 _mesa_glsl_error(&loc
, state
,
5237 "`%s' has already been redeclared using "
5238 "gl_PerVertex", declared_var
->name
);
5240 declared_var
->data
.how_declared
= ir_var_declared_normally
;
5243 if (decl
->initializer
!= NULL
) {
5244 result
= process_initializer(declared_var
,
5246 &initializer_instructions
, state
);
5248 validate_array_dimensions(var_type
, state
, &loc
);
5251 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
5253 * "It is an error to write to a const variable outside of
5254 * its declaration, so they must be initialized when
5257 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
5258 _mesa_glsl_error(& loc
, state
,
5259 "const declaration of `%s' must be initialized",
5263 if (state
->es_shader
) {
5264 const glsl_type
*const t
= declared_var
->type
;
5266 /* Skip the unsized array check for TCS/TES/GS inputs & TCS outputs.
5268 * The GL_OES_tessellation_shader spec says about inputs:
5270 * "Declaring an array size is optional. If no size is specified,
5271 * it will be taken from the implementation-dependent maximum
5272 * patch size (gl_MaxPatchVertices)."
5274 * and about TCS outputs:
5276 * "If no size is specified, it will be taken from output patch
5277 * size declared in the shader."
5279 * The GL_OES_geometry_shader spec says:
5281 * "All geometry shader input unsized array declarations will be
5282 * sized by an earlier input primitive layout qualifier, when
5283 * present, as per the following table."
5285 const bool implicitly_sized
=
5286 (declared_var
->data
.mode
== ir_var_shader_in
&&
5287 state
->stage
>= MESA_SHADER_TESS_CTRL
&&
5288 state
->stage
<= MESA_SHADER_GEOMETRY
) ||
5289 (declared_var
->data
.mode
== ir_var_shader_out
&&
5290 state
->stage
== MESA_SHADER_TESS_CTRL
);
5292 if (t
->is_unsized_array() && !implicitly_sized
)
5293 /* Section 10.17 of the GLSL ES 1.00 specification states that
5294 * unsized array declarations have been removed from the language.
5295 * Arrays that are sized using an initializer are still explicitly
5296 * sized. However, GLSL ES 1.00 does not allow array
5297 * initializers. That is only allowed in GLSL ES 3.00.
5299 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
5301 * "An array type can also be formed without specifying a size
5302 * if the definition includes an initializer:
5304 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
5305 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
5310 _mesa_glsl_error(& loc
, state
,
5311 "unsized array declarations are not allowed in "
5315 /* If the declaration is not a redeclaration, there are a few additional
5316 * semantic checks that must be applied. In addition, variable that was
5317 * created for the declaration should be added to the IR stream.
5319 if (!is_redeclaration
) {
5320 validate_identifier(decl
->identifier
, loc
, state
);
5322 /* Add the variable to the symbol table. Note that the initializer's
5323 * IR was already processed earlier (though it hasn't been emitted
5324 * yet), without the variable in scope.
5326 * This differs from most C-like languages, but it follows the GLSL
5327 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
5330 * "Within a declaration, the scope of a name starts immediately
5331 * after the initializer if present or immediately after the name
5332 * being declared if not."
5334 if (!state
->symbols
->add_variable(declared_var
)) {
5335 YYLTYPE loc
= this->get_location();
5336 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
5337 "current scope", decl
->identifier
);
5341 /* Push the variable declaration to the top. It means that all the
5342 * variable declarations will appear in a funny last-to-first order,
5343 * but otherwise we run into trouble if a function is prototyped, a
5344 * global var is decled, then the function is defined with usage of
5345 * the global var. See glslparsertest's CorrectModule.frag.
5347 instructions
->push_head(declared_var
);
5350 instructions
->append_list(&initializer_instructions
);
5354 /* Generally, variable declarations do not have r-values. However,
5355 * one is used for the declaration in
5357 * while (bool b = some_condition()) {
5361 * so we return the rvalue from the last seen declaration here.
5368 ast_parameter_declarator::hir(exec_list
*instructions
,
5369 struct _mesa_glsl_parse_state
*state
)
5372 const struct glsl_type
*type
;
5373 const char *name
= NULL
;
5374 YYLTYPE loc
= this->get_location();
5376 type
= this->type
->glsl_type(& name
, state
);
5380 _mesa_glsl_error(& loc
, state
,
5381 "invalid type `%s' in declaration of `%s'",
5382 name
, this->identifier
);
5384 _mesa_glsl_error(& loc
, state
,
5385 "invalid type in declaration of `%s'",
5389 type
= glsl_type::error_type
;
5392 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
5394 * "Functions that accept no input arguments need not use void in the
5395 * argument list because prototypes (or definitions) are required and
5396 * therefore there is no ambiguity when an empty argument list "( )" is
5397 * declared. The idiom "(void)" as a parameter list is provided for
5400 * Placing this check here prevents a void parameter being set up
5401 * for a function, which avoids tripping up checks for main taking
5402 * parameters and lookups of an unnamed symbol.
5404 if (type
->is_void()) {
5405 if (this->identifier
!= NULL
)
5406 _mesa_glsl_error(& loc
, state
,
5407 "named parameter cannot have type `void'");
5413 if (formal_parameter
&& (this->identifier
== NULL
)) {
5414 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
5418 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
5419 * call already handled the "vec4[..] foo" case.
5421 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
5423 if (!type
->is_error() && type
->is_unsized_array()) {
5424 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
5426 type
= glsl_type::error_type
;
5430 ir_variable
*var
= new(ctx
)
5431 ir_variable(type
, this->identifier
, ir_var_function_in
);
5433 /* Apply any specified qualifiers to the parameter declaration. Note that
5434 * for function parameters the default mode is 'in'.
5436 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
5439 /* From section 4.1.7 of the GLSL 4.40 spec:
5441 * "Opaque variables cannot be treated as l-values; hence cannot
5442 * be used as out or inout function parameters, nor can they be
5445 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5446 && type
->contains_opaque()) {
5447 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
5448 "contain opaque variables");
5449 type
= glsl_type::error_type
;
5452 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
5454 * "When calling a function, expressions that do not evaluate to
5455 * l-values cannot be passed to parameters declared as out or inout."
5457 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
5459 * "Other binary or unary expressions, non-dereferenced arrays,
5460 * function names, swizzles with repeated fields, and constants
5461 * cannot be l-values."
5463 * So for GLSL 1.10, passing an array as an out or inout parameter is not
5464 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
5466 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
5468 && !state
->check_version(120, 100, &loc
,
5469 "arrays cannot be out or inout parameters")) {
5470 type
= glsl_type::error_type
;
5473 instructions
->push_tail(var
);
5475 /* Parameter declarations do not have r-values.
5482 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
5484 exec_list
*ir_parameters
,
5485 _mesa_glsl_parse_state
*state
)
5487 ast_parameter_declarator
*void_param
= NULL
;
5490 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
5491 param
->formal_parameter
= formal
;
5492 param
->hir(ir_parameters
, state
);
5500 if ((void_param
!= NULL
) && (count
> 1)) {
5501 YYLTYPE loc
= void_param
->get_location();
5503 _mesa_glsl_error(& loc
, state
,
5504 "`void' parameter must be only parameter");
5510 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
5512 /* IR invariants disallow function declarations or definitions
5513 * nested within other function definitions. But there is no
5514 * requirement about the relative order of function declarations
5515 * and definitions with respect to one another. So simply insert
5516 * the new ir_function block at the end of the toplevel instruction
5519 state
->toplevel_ir
->push_tail(f
);
5524 ast_function::hir(exec_list
*instructions
,
5525 struct _mesa_glsl_parse_state
*state
)
5528 ir_function
*f
= NULL
;
5529 ir_function_signature
*sig
= NULL
;
5530 exec_list hir_parameters
;
5531 YYLTYPE loc
= this->get_location();
5533 const char *const name
= identifier
;
5535 /* New functions are always added to the top-level IR instruction stream,
5536 * so this instruction list pointer is ignored. See also emit_function
5539 (void) instructions
;
5541 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
5543 * "Function declarations (prototypes) cannot occur inside of functions;
5544 * they must be at global scope, or for the built-in functions, outside
5545 * the global scope."
5547 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
5549 * "User defined functions may only be defined within the global scope."
5551 * Note that this language does not appear in GLSL 1.10.
5553 if ((state
->current_function
!= NULL
) &&
5554 state
->is_version(120, 100)) {
5555 YYLTYPE loc
= this->get_location();
5556 _mesa_glsl_error(&loc
, state
,
5557 "declaration of function `%s' not allowed within "
5558 "function body", name
);
5561 validate_identifier(name
, this->get_location(), state
);
5563 /* Convert the list of function parameters to HIR now so that they can be
5564 * used below to compare this function's signature with previously seen
5565 * signatures for functions with the same name.
5567 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
5569 & hir_parameters
, state
);
5571 const char *return_type_name
;
5572 const glsl_type
*return_type
=
5573 this->return_type
->glsl_type(& return_type_name
, state
);
5576 YYLTYPE loc
= this->get_location();
5577 _mesa_glsl_error(&loc
, state
,
5578 "function `%s' has undeclared return type `%s'",
5579 name
, return_type_name
);
5580 return_type
= glsl_type::error_type
;
5583 /* ARB_shader_subroutine states:
5584 * "Subroutine declarations cannot be prototyped. It is an error to prepend
5585 * subroutine(...) to a function declaration."
5587 if (this->return_type
->qualifier
.subroutine_list
&& !is_definition
) {
5588 YYLTYPE loc
= this->get_location();
5589 _mesa_glsl_error(&loc
, state
,
5590 "function declaration `%s' cannot have subroutine prepended",
5594 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
5595 * "No qualifier is allowed on the return type of a function."
5597 if (this->return_type
->has_qualifiers(state
)) {
5598 YYLTYPE loc
= this->get_location();
5599 _mesa_glsl_error(& loc
, state
,
5600 "function `%s' return type has qualifiers", name
);
5603 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
5605 * "Arrays are allowed as arguments and as the return type. In both
5606 * cases, the array must be explicitly sized."
5608 if (return_type
->is_unsized_array()) {
5609 YYLTYPE loc
= this->get_location();
5610 _mesa_glsl_error(& loc
, state
,
5611 "function `%s' return type array must be explicitly "
5615 /* From section 4.1.7 of the GLSL 4.40 spec:
5617 * "[Opaque types] can only be declared as function parameters
5618 * or uniform-qualified variables."
5620 if (return_type
->contains_opaque()) {
5621 YYLTYPE loc
= this->get_location();
5622 _mesa_glsl_error(&loc
, state
,
5623 "function `%s' return type can't contain an opaque type",
5628 if (return_type
->is_subroutine()) {
5629 YYLTYPE loc
= this->get_location();
5630 _mesa_glsl_error(&loc
, state
,
5631 "function `%s' return type can't be a subroutine type",
5636 /* Create an ir_function if one doesn't already exist. */
5637 f
= state
->symbols
->get_function(name
);
5639 f
= new(ctx
) ir_function(name
);
5640 if (!this->return_type
->qualifier
.is_subroutine_decl()) {
5641 if (!state
->symbols
->add_function(f
)) {
5642 /* This function name shadows a non-function use of the same name. */
5643 YYLTYPE loc
= this->get_location();
5644 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
5645 "non-function", name
);
5649 emit_function(state
, f
);
5652 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
5654 * "A shader cannot redefine or overload built-in functions."
5656 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
5658 * "User code can overload the built-in functions but cannot redefine
5661 if (state
->es_shader
&& state
->language_version
>= 300) {
5662 /* Local shader has no exact candidates; check the built-ins. */
5663 _mesa_glsl_initialize_builtin_functions();
5664 if (_mesa_glsl_has_builtin_function(name
)) {
5665 YYLTYPE loc
= this->get_location();
5666 _mesa_glsl_error(& loc
, state
,
5667 "A shader cannot redefine or overload built-in "
5668 "function `%s' in GLSL ES 3.00", name
);
5673 /* Verify that this function's signature either doesn't match a previously
5674 * seen signature for a function with the same name, or, if a match is found,
5675 * that the previously seen signature does not have an associated definition.
5677 if (state
->es_shader
|| f
->has_user_signature()) {
5678 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
5680 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
5681 if (badvar
!= NULL
) {
5682 YYLTYPE loc
= this->get_location();
5684 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
5685 "qualifiers don't match prototype", name
, badvar
);
5688 if (sig
->return_type
!= return_type
) {
5689 YYLTYPE loc
= this->get_location();
5691 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
5692 "match prototype", name
);
5695 if (sig
->is_defined
) {
5696 if (is_definition
) {
5697 YYLTYPE loc
= this->get_location();
5698 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
5700 /* We just encountered a prototype that exactly matches a
5701 * function that's already been defined. This is redundant,
5702 * and we should ignore it.
5710 /* Verify the return type of main() */
5711 if (strcmp(name
, "main") == 0) {
5712 if (! return_type
->is_void()) {
5713 YYLTYPE loc
= this->get_location();
5715 _mesa_glsl_error(& loc
, state
, "main() must return void");
5718 if (!hir_parameters
.is_empty()) {
5719 YYLTYPE loc
= this->get_location();
5721 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
5725 /* Finish storing the information about this new function in its signature.
5728 sig
= new(ctx
) ir_function_signature(return_type
);
5729 f
->add_signature(sig
);
5732 sig
->replace_parameters(&hir_parameters
);
5735 if (this->return_type
->qualifier
.subroutine_list
) {
5738 if (this->return_type
->qualifier
.flags
.q
.explicit_index
) {
5739 unsigned qual_index
;
5740 if (process_qualifier_constant(state
, &loc
, "index",
5741 this->return_type
->qualifier
.index
,
5743 if (!state
->has_explicit_uniform_location()) {
5744 _mesa_glsl_error(&loc
, state
, "subroutine index requires "
5745 "GL_ARB_explicit_uniform_location or "
5747 } else if (qual_index
>= MAX_SUBROUTINES
) {
5748 _mesa_glsl_error(&loc
, state
,
5749 "invalid subroutine index (%d) index must "
5750 "be a number between 0 and "
5751 "GL_MAX_SUBROUTINES - 1 (%d)", qual_index
,
5752 MAX_SUBROUTINES
- 1);
5754 f
->subroutine_index
= qual_index
;
5759 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
5760 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
5761 f
->num_subroutine_types
);
5763 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
5764 const struct glsl_type
*type
;
5765 /* the subroutine type must be already declared */
5766 type
= state
->symbols
->get_type(decl
->identifier
);
5768 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
5771 for (int i
= 0; i
< state
->num_subroutine_types
; i
++) {
5772 ir_function
*fn
= state
->subroutine_types
[i
];
5773 ir_function_signature
*tsig
= NULL
;
5775 if (strcmp(fn
->name
, decl
->identifier
))
5778 tsig
= fn
->matching_signature(state
, &sig
->parameters
,
5781 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - signatures do not match\n", decl
->identifier
);
5783 if (tsig
->return_type
!= sig
->return_type
) {
5784 _mesa_glsl_error(& loc
, state
, "subroutine type mismatch '%s' - return types do not match\n", decl
->identifier
);
5788 f
->subroutine_types
[idx
++] = type
;
5790 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
5792 state
->num_subroutines
+ 1);
5793 state
->subroutines
[state
->num_subroutines
] = f
;
5794 state
->num_subroutines
++;
5798 if (this->return_type
->qualifier
.is_subroutine_decl()) {
5799 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
5800 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
5803 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
5805 state
->num_subroutine_types
+ 1);
5806 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
5807 state
->num_subroutine_types
++;
5809 f
->is_subroutine
= true;
5812 /* Function declarations (prototypes) do not have r-values.
5819 ast_function_definition::hir(exec_list
*instructions
,
5820 struct _mesa_glsl_parse_state
*state
)
5822 prototype
->is_definition
= true;
5823 prototype
->hir(instructions
, state
);
5825 ir_function_signature
*signature
= prototype
->signature
;
5826 if (signature
== NULL
)
5829 assert(state
->current_function
== NULL
);
5830 state
->current_function
= signature
;
5831 state
->found_return
= false;
5833 /* Duplicate parameters declared in the prototype as concrete variables.
5834 * Add these to the symbol table.
5836 state
->symbols
->push_scope();
5837 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
5838 assert(var
->as_variable() != NULL
);
5840 /* The only way a parameter would "exist" is if two parameters have
5843 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
5844 YYLTYPE loc
= this->get_location();
5846 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
5848 state
->symbols
->add_variable(var
);
5852 /* Convert the body of the function to HIR. */
5853 this->body
->hir(&signature
->body
, state
);
5854 signature
->is_defined
= true;
5856 state
->symbols
->pop_scope();
5858 assert(state
->current_function
== signature
);
5859 state
->current_function
= NULL
;
5861 if (!signature
->return_type
->is_void() && !state
->found_return
) {
5862 YYLTYPE loc
= this->get_location();
5863 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
5864 "%s, but no return statement",
5865 signature
->function_name(),
5866 signature
->return_type
->name
);
5869 /* Function definitions do not have r-values.
5876 ast_jump_statement::hir(exec_list
*instructions
,
5877 struct _mesa_glsl_parse_state
*state
)
5884 assert(state
->current_function
);
5886 if (opt_return_value
) {
5887 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
5889 /* The value of the return type can be NULL if the shader says
5890 * 'return foo();' and foo() is a function that returns void.
5892 * NOTE: The GLSL spec doesn't say that this is an error. The type
5893 * of the return value is void. If the return type of the function is
5894 * also void, then this should compile without error. Seriously.
5896 const glsl_type
*const ret_type
=
5897 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
5899 /* Implicit conversions are not allowed for return values prior to
5900 * ARB_shading_language_420pack.
5902 if (state
->current_function
->return_type
!= ret_type
) {
5903 YYLTYPE loc
= this->get_location();
5905 if (state
->has_420pack()) {
5906 if (!apply_implicit_conversion(state
->current_function
->return_type
,
5908 _mesa_glsl_error(& loc
, state
,
5909 "could not implicitly convert return value "
5910 "to %s, in function `%s'",
5911 state
->current_function
->return_type
->name
,
5912 state
->current_function
->function_name());
5915 _mesa_glsl_error(& loc
, state
,
5916 "`return' with wrong type %s, in function `%s' "
5919 state
->current_function
->function_name(),
5920 state
->current_function
->return_type
->name
);
5922 } else if (state
->current_function
->return_type
->base_type
==
5924 YYLTYPE loc
= this->get_location();
5926 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
5927 * specs add a clarification:
5929 * "A void function can only use return without a return argument, even if
5930 * the return argument has void type. Return statements only accept values:
5933 * void func2() { return func1(); } // illegal return statement"
5935 _mesa_glsl_error(& loc
, state
,
5936 "void functions can only use `return' without a "
5940 inst
= new(ctx
) ir_return(ret
);
5942 if (state
->current_function
->return_type
->base_type
!=
5944 YYLTYPE loc
= this->get_location();
5946 _mesa_glsl_error(& loc
, state
,
5947 "`return' with no value, in function %s returning "
5949 state
->current_function
->function_name());
5951 inst
= new(ctx
) ir_return
;
5954 state
->found_return
= true;
5955 instructions
->push_tail(inst
);
5960 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
5961 YYLTYPE loc
= this->get_location();
5963 _mesa_glsl_error(& loc
, state
,
5964 "`discard' may only appear in a fragment shader");
5966 instructions
->push_tail(new(ctx
) ir_discard
);
5971 if (mode
== ast_continue
&&
5972 state
->loop_nesting_ast
== NULL
) {
5973 YYLTYPE loc
= this->get_location();
5975 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
5976 } else if (mode
== ast_break
&&
5977 state
->loop_nesting_ast
== NULL
&&
5978 state
->switch_state
.switch_nesting_ast
== NULL
) {
5979 YYLTYPE loc
= this->get_location();
5981 _mesa_glsl_error(& loc
, state
,
5982 "break may only appear in a loop or a switch");
5984 /* For a loop, inline the for loop expression again, since we don't
5985 * know where near the end of the loop body the normal copy of it is
5986 * going to be placed. Same goes for the condition for a do-while
5989 if (state
->loop_nesting_ast
!= NULL
&&
5990 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
5991 if (state
->loop_nesting_ast
->rest_expression
) {
5992 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
5995 if (state
->loop_nesting_ast
->mode
==
5996 ast_iteration_statement::ast_do_while
) {
5997 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
6001 if (state
->switch_state
.is_switch_innermost
&&
6002 mode
== ast_continue
) {
6003 /* Set 'continue_inside' to true. */
6004 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
6005 ir_dereference_variable
*deref_continue_inside_var
=
6006 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6007 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6010 /* Break out from the switch, continue for the loop will
6011 * be called right after switch. */
6012 ir_loop_jump
*const jump
=
6013 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6014 instructions
->push_tail(jump
);
6016 } else if (state
->switch_state
.is_switch_innermost
&&
6017 mode
== ast_break
) {
6018 /* Force break out of switch by inserting a break. */
6019 ir_loop_jump
*const jump
=
6020 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6021 instructions
->push_tail(jump
);
6023 ir_loop_jump
*const jump
=
6024 new(ctx
) ir_loop_jump((mode
== ast_break
)
6025 ? ir_loop_jump::jump_break
6026 : ir_loop_jump::jump_continue
);
6027 instructions
->push_tail(jump
);
6034 /* Jump instructions do not have r-values.
6041 ast_selection_statement::hir(exec_list
*instructions
,
6042 struct _mesa_glsl_parse_state
*state
)
6046 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
6048 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
6050 * "Any expression whose type evaluates to a Boolean can be used as the
6051 * conditional expression bool-expression. Vector types are not accepted
6052 * as the expression to if."
6054 * The checks are separated so that higher quality diagnostics can be
6055 * generated for cases where both rules are violated.
6057 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
6058 YYLTYPE loc
= this->condition
->get_location();
6060 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
6064 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
6066 if (then_statement
!= NULL
) {
6067 state
->symbols
->push_scope();
6068 then_statement
->hir(& stmt
->then_instructions
, state
);
6069 state
->symbols
->pop_scope();
6072 if (else_statement
!= NULL
) {
6073 state
->symbols
->push_scope();
6074 else_statement
->hir(& stmt
->else_instructions
, state
);
6075 state
->symbols
->pop_scope();
6078 instructions
->push_tail(stmt
);
6080 /* if-statements do not have r-values.
6086 /* Used for detection of duplicate case values, compare
6087 * given contents directly.
6090 compare_case_value(const void *a
, const void *b
)
6092 return *(unsigned *) a
== *(unsigned *) b
;
6096 /* Used for detection of duplicate case values, just
6097 * returns key contents as is.
6100 key_contents(const void *key
)
6102 return *(unsigned *) key
;
6107 ast_switch_statement::hir(exec_list
*instructions
,
6108 struct _mesa_glsl_parse_state
*state
)
6112 ir_rvalue
*const test_expression
=
6113 this->test_expression
->hir(instructions
, state
);
6115 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
6117 * "The type of init-expression in a switch statement must be a
6120 if (!test_expression
->type
->is_scalar() ||
6121 !test_expression
->type
->is_integer()) {
6122 YYLTYPE loc
= this->test_expression
->get_location();
6124 _mesa_glsl_error(& loc
,
6126 "switch-statement expression must be scalar "
6130 /* Track the switch-statement nesting in a stack-like manner.
6132 struct glsl_switch_state saved
= state
->switch_state
;
6134 state
->switch_state
.is_switch_innermost
= true;
6135 state
->switch_state
.switch_nesting_ast
= this;
6136 state
->switch_state
.labels_ht
=
6137 _mesa_hash_table_create(NULL
, key_contents
,
6138 compare_case_value
);
6139 state
->switch_state
.previous_default
= NULL
;
6141 /* Initalize is_fallthru state to false.
6143 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
6144 state
->switch_state
.is_fallthru_var
=
6145 new(ctx
) ir_variable(glsl_type::bool_type
,
6146 "switch_is_fallthru_tmp",
6148 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
6150 ir_dereference_variable
*deref_is_fallthru_var
=
6151 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6152 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
6155 /* Initialize continue_inside state to false.
6157 state
->switch_state
.continue_inside
=
6158 new(ctx
) ir_variable(glsl_type::bool_type
,
6159 "continue_inside_tmp",
6161 instructions
->push_tail(state
->switch_state
.continue_inside
);
6163 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
6164 ir_dereference_variable
*deref_continue_inside_var
=
6165 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6166 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
6169 state
->switch_state
.run_default
=
6170 new(ctx
) ir_variable(glsl_type::bool_type
,
6173 instructions
->push_tail(state
->switch_state
.run_default
);
6175 /* Loop around the switch is used for flow control. */
6176 ir_loop
* loop
= new(ctx
) ir_loop();
6177 instructions
->push_tail(loop
);
6179 /* Cache test expression.
6181 test_to_hir(&loop
->body_instructions
, state
);
6183 /* Emit code for body of switch stmt.
6185 body
->hir(&loop
->body_instructions
, state
);
6187 /* Insert a break at the end to exit loop. */
6188 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6189 loop
->body_instructions
.push_tail(jump
);
6191 /* If we are inside loop, check if continue got called inside switch. */
6192 if (state
->loop_nesting_ast
!= NULL
) {
6193 ir_dereference_variable
*deref_continue_inside
=
6194 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
6195 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
6196 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
6198 if (state
->loop_nesting_ast
!= NULL
) {
6199 if (state
->loop_nesting_ast
->rest_expression
) {
6200 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
6203 if (state
->loop_nesting_ast
->mode
==
6204 ast_iteration_statement::ast_do_while
) {
6205 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
6208 irif
->then_instructions
.push_tail(jump
);
6209 instructions
->push_tail(irif
);
6212 _mesa_hash_table_destroy(state
->switch_state
.labels_ht
, NULL
);
6214 state
->switch_state
= saved
;
6216 /* Switch statements do not have r-values. */
6222 ast_switch_statement::test_to_hir(exec_list
*instructions
,
6223 struct _mesa_glsl_parse_state
*state
)
6227 /* set to true to avoid a duplicate "use of uninitialized variable" warning
6228 * on the switch test case. The first one would be already raised when
6229 * getting the test_expression at ast_switch_statement::hir
6231 test_expression
->set_is_lhs(true);
6232 /* Cache value of test expression. */
6233 ir_rvalue
*const test_val
= test_expression
->hir(instructions
, state
);
6235 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
6238 ir_dereference_variable
*deref_test_var
=
6239 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6241 instructions
->push_tail(state
->switch_state
.test_var
);
6242 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
6247 ast_switch_body::hir(exec_list
*instructions
,
6248 struct _mesa_glsl_parse_state
*state
)
6251 stmts
->hir(instructions
, state
);
6253 /* Switch bodies do not have r-values. */
6258 ast_case_statement_list::hir(exec_list
*instructions
,
6259 struct _mesa_glsl_parse_state
*state
)
6261 exec_list default_case
, after_default
, tmp
;
6263 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
6264 case_stmt
->hir(&tmp
, state
);
6267 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
6268 default_case
.append_list(&tmp
);
6272 /* If default case found, append 'after_default' list. */
6273 if (!default_case
.is_empty())
6274 after_default
.append_list(&tmp
);
6276 instructions
->append_list(&tmp
);
6279 /* Handle the default case. This is done here because default might not be
6280 * the last case. We need to add checks against following cases first to see
6281 * if default should be chosen or not.
6283 if (!default_case
.is_empty()) {
6285 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
6286 ir_dereference_variable
*deref_run_default_var
=
6287 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6289 /* Choose to run default case initially, following conditional
6290 * assignments might change this.
6292 ir_assignment
*const init_var
=
6293 new(state
) ir_assignment(deref_run_default_var
, true_val
);
6294 instructions
->push_tail(init_var
);
6296 /* Default case was the last one, no checks required. */
6297 if (after_default
.is_empty()) {
6298 instructions
->append_list(&default_case
);
6302 foreach_in_list(ir_instruction
, ir
, &after_default
) {
6303 ir_assignment
*assign
= ir
->as_assignment();
6308 /* Clone the check between case label and init expression. */
6309 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
6310 ir_expression
*clone
= exp
->clone(state
, NULL
);
6312 ir_dereference_variable
*deref_var
=
6313 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
6314 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
6316 ir_assignment
*const set_false
=
6317 new(state
) ir_assignment(deref_var
, false_val
, clone
);
6319 instructions
->push_tail(set_false
);
6322 /* Append default case and all cases after it. */
6323 instructions
->append_list(&default_case
);
6324 instructions
->append_list(&after_default
);
6327 /* Case statements do not have r-values. */
6332 ast_case_statement::hir(exec_list
*instructions
,
6333 struct _mesa_glsl_parse_state
*state
)
6335 labels
->hir(instructions
, state
);
6337 /* Guard case statements depending on fallthru state. */
6338 ir_dereference_variable
*const deref_fallthru_guard
=
6339 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6340 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
6342 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
6343 stmt
->hir(& test_fallthru
->then_instructions
, state
);
6345 instructions
->push_tail(test_fallthru
);
6347 /* Case statements do not have r-values. */
6353 ast_case_label_list::hir(exec_list
*instructions
,
6354 struct _mesa_glsl_parse_state
*state
)
6356 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
6357 label
->hir(instructions
, state
);
6359 /* Case labels do not have r-values. */
6364 ast_case_label::hir(exec_list
*instructions
,
6365 struct _mesa_glsl_parse_state
*state
)
6369 ir_dereference_variable
*deref_fallthru_var
=
6370 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
6372 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
6374 /* If not default case, ... */
6375 if (this->test_value
!= NULL
) {
6376 /* Conditionally set fallthru state based on
6377 * comparison of cached test expression value to case label.
6379 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
6380 ir_constant
*label_const
= label_rval
->constant_expression_value();
6383 YYLTYPE loc
= this->test_value
->get_location();
6385 _mesa_glsl_error(& loc
, state
,
6386 "switch statement case label must be a "
6387 "constant expression");
6389 /* Stuff a dummy value in to allow processing to continue. */
6390 label_const
= new(ctx
) ir_constant(0);
6393 _mesa_hash_table_search(state
->switch_state
.labels_ht
,
6394 (void *)(uintptr_t)&label_const
->value
.u
[0]);
6397 ast_expression
*previous_label
= (ast_expression
*) entry
->data
;
6398 YYLTYPE loc
= this->test_value
->get_location();
6399 _mesa_glsl_error(& loc
, state
, "duplicate case value");
6401 loc
= previous_label
->get_location();
6402 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
6404 _mesa_hash_table_insert(state
->switch_state
.labels_ht
,
6405 (void *)(uintptr_t)&label_const
->value
.u
[0],
6410 ir_dereference_variable
*deref_test_var
=
6411 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
6413 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6418 * From GLSL 4.40 specification section 6.2 ("Selection"):
6420 * "The type of the init-expression value in a switch statement must
6421 * be a scalar int or uint. The type of the constant-expression value
6422 * in a case label also must be a scalar int or uint. When any pair
6423 * of these values is tested for "equal value" and the types do not
6424 * match, an implicit conversion will be done to convert the int to a
6425 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
6428 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
6429 YYLTYPE loc
= this->test_value
->get_location();
6431 const glsl_type
*type_a
= label_const
->type
;
6432 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
6434 /* Check if int->uint implicit conversion is supported. */
6435 bool integer_conversion_supported
=
6436 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
6439 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
6440 !integer_conversion_supported
) {
6441 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
6442 "init-expression and case label (%s != %s)",
6443 type_a
->name
, type_b
->name
);
6445 /* Conversion of the case label. */
6446 if (type_a
->base_type
== GLSL_TYPE_INT
) {
6447 if (!apply_implicit_conversion(glsl_type::uint_type
,
6448 test_cond
->operands
[0], state
))
6449 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6451 /* Conversion of the init-expression value. */
6452 if (!apply_implicit_conversion(glsl_type::uint_type
,
6453 test_cond
->operands
[1], state
))
6454 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
6459 ir_assignment
*set_fallthru_on_test
=
6460 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6462 instructions
->push_tail(set_fallthru_on_test
);
6463 } else { /* default case */
6464 if (state
->switch_state
.previous_default
) {
6465 YYLTYPE loc
= this->get_location();
6466 _mesa_glsl_error(& loc
, state
,
6467 "multiple default labels in one switch");
6469 loc
= state
->switch_state
.previous_default
->get_location();
6470 _mesa_glsl_error(& loc
, state
, "this is the first default label");
6472 state
->switch_state
.previous_default
= this;
6474 /* Set fallthru condition on 'run_default' bool. */
6475 ir_dereference_variable
*deref_run_default
=
6476 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
6477 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
6478 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
6482 /* Set falltrhu state. */
6483 ir_assignment
*set_fallthru
=
6484 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
6486 instructions
->push_tail(set_fallthru
);
6489 /* Case statements do not have r-values. */
6494 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
6495 struct _mesa_glsl_parse_state
*state
)
6499 if (condition
!= NULL
) {
6500 ir_rvalue
*const cond
=
6501 condition
->hir(instructions
, state
);
6504 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
6505 YYLTYPE loc
= condition
->get_location();
6507 _mesa_glsl_error(& loc
, state
,
6508 "loop condition must be scalar boolean");
6510 /* As the first code in the loop body, generate a block that looks
6511 * like 'if (!condition) break;' as the loop termination condition.
6513 ir_rvalue
*const not_cond
=
6514 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
6516 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
6518 ir_jump
*const break_stmt
=
6519 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
6521 if_stmt
->then_instructions
.push_tail(break_stmt
);
6522 instructions
->push_tail(if_stmt
);
6529 ast_iteration_statement::hir(exec_list
*instructions
,
6530 struct _mesa_glsl_parse_state
*state
)
6534 /* For-loops and while-loops start a new scope, but do-while loops do not.
6536 if (mode
!= ast_do_while
)
6537 state
->symbols
->push_scope();
6539 if (init_statement
!= NULL
)
6540 init_statement
->hir(instructions
, state
);
6542 ir_loop
*const stmt
= new(ctx
) ir_loop();
6543 instructions
->push_tail(stmt
);
6545 /* Track the current loop nesting. */
6546 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
6548 state
->loop_nesting_ast
= this;
6550 /* Likewise, indicate that following code is closest to a loop,
6551 * NOT closest to a switch.
6553 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
6554 state
->switch_state
.is_switch_innermost
= false;
6556 if (mode
!= ast_do_while
)
6557 condition_to_hir(&stmt
->body_instructions
, state
);
6560 body
->hir(& stmt
->body_instructions
, state
);
6562 if (rest_expression
!= NULL
)
6563 rest_expression
->hir(& stmt
->body_instructions
, state
);
6565 if (mode
== ast_do_while
)
6566 condition_to_hir(&stmt
->body_instructions
, state
);
6568 if (mode
!= ast_do_while
)
6569 state
->symbols
->pop_scope();
6571 /* Restore previous nesting before returning. */
6572 state
->loop_nesting_ast
= nesting_ast
;
6573 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
6575 /* Loops do not have r-values.
6582 * Determine if the given type is valid for establishing a default precision
6585 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
6587 * "The precision statement
6589 * precision precision-qualifier type;
6591 * can be used to establish a default precision qualifier. The type field
6592 * can be either int or float or any of the sampler types, and the
6593 * precision-qualifier can be lowp, mediump, or highp."
6595 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
6596 * qualifiers on sampler types, but this seems like an oversight (since the
6597 * intention of including these in GLSL 1.30 is to allow compatibility with ES
6598 * shaders). So we allow int, float, and all sampler types regardless of GLSL
6602 is_valid_default_precision_type(const struct glsl_type
*const type
)
6607 switch (type
->base_type
) {
6609 case GLSL_TYPE_FLOAT
:
6610 /* "int" and "float" are valid, but vectors and matrices are not. */
6611 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
6612 case GLSL_TYPE_SAMPLER
:
6613 case GLSL_TYPE_IMAGE
:
6614 case GLSL_TYPE_ATOMIC_UINT
:
6623 ast_type_specifier::hir(exec_list
*instructions
,
6624 struct _mesa_glsl_parse_state
*state
)
6626 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
6629 YYLTYPE loc
= this->get_location();
6631 /* If this is a precision statement, check that the type to which it is
6632 * applied is either float or int.
6634 * From section 4.5.3 of the GLSL 1.30 spec:
6635 * "The precision statement
6636 * precision precision-qualifier type;
6637 * can be used to establish a default precision qualifier. The type
6638 * field can be either int or float [...]. Any other types or
6639 * qualifiers will result in an error.
6641 if (this->default_precision
!= ast_precision_none
) {
6642 if (!state
->check_precision_qualifiers_allowed(&loc
))
6645 if (this->structure
!= NULL
) {
6646 _mesa_glsl_error(&loc
, state
,
6647 "precision qualifiers do not apply to structures");
6651 if (this->array_specifier
!= NULL
) {
6652 _mesa_glsl_error(&loc
, state
,
6653 "default precision statements do not apply to "
6658 const struct glsl_type
*const type
=
6659 state
->symbols
->get_type(this->type_name
);
6660 if (!is_valid_default_precision_type(type
)) {
6661 _mesa_glsl_error(&loc
, state
,
6662 "default precision statements apply only to "
6663 "float, int, and opaque types");
6667 if (state
->es_shader
) {
6668 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
6671 * "Non-precision qualified declarations will use the precision
6672 * qualifier specified in the most recent precision statement
6673 * that is still in scope. The precision statement has the same
6674 * scoping rules as variable declarations. If it is declared
6675 * inside a compound statement, its effect stops at the end of
6676 * the innermost statement it was declared in. Precision
6677 * statements in nested scopes override precision statements in
6678 * outer scopes. Multiple precision statements for the same basic
6679 * type can appear inside the same scope, with later statements
6680 * overriding earlier statements within that scope."
6682 * Default precision specifications follow the same scope rules as
6683 * variables. So, we can track the state of the default precision
6684 * qualifiers in the symbol table, and the rules will just work. This
6685 * is a slight abuse of the symbol table, but it has the semantics
6688 state
->symbols
->add_default_precision_qualifier(this->type_name
,
6689 this->default_precision
);
6692 /* FINISHME: Translate precision statements into IR. */
6696 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
6697 * process_record_constructor() can do type-checking on C-style initializer
6698 * expressions of structs, but ast_struct_specifier should only be translated
6699 * to HIR if it is declaring the type of a structure.
6701 * The ->is_declaration field is false for initializers of variables
6702 * declared separately from the struct's type definition.
6704 * struct S { ... }; (is_declaration = true)
6705 * struct T { ... } t = { ... }; (is_declaration = true)
6706 * S s = { ... }; (is_declaration = false)
6708 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
6709 return this->structure
->hir(instructions
, state
);
6716 * Process a structure or interface block tree into an array of structure fields
6718 * After parsing, where there are some syntax differnces, structures and
6719 * interface blocks are almost identical. They are similar enough that the
6720 * AST for each can be processed the same way into a set of
6721 * \c glsl_struct_field to describe the members.
6723 * If we're processing an interface block, var_mode should be the type of the
6724 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
6725 * ir_var_shader_storage). If we're processing a structure, var_mode should be
6729 * The number of fields processed. A pointer to the array structure fields is
6730 * stored in \c *fields_ret.
6733 ast_process_struct_or_iface_block_members(exec_list
*instructions
,
6734 struct _mesa_glsl_parse_state
*state
,
6735 exec_list
*declarations
,
6736 glsl_struct_field
**fields_ret
,
6738 enum glsl_matrix_layout matrix_layout
,
6739 bool allow_reserved_names
,
6740 ir_variable_mode var_mode
,
6741 ast_type_qualifier
*layout
,
6742 unsigned block_stream
,
6743 unsigned block_xfb_buffer
,
6744 unsigned block_xfb_offset
,
6745 unsigned expl_location
,
6746 unsigned expl_align
)
6748 unsigned decl_count
= 0;
6749 unsigned next_offset
= 0;
6751 /* Make an initial pass over the list of fields to determine how
6752 * many there are. Each element in this list is an ast_declarator_list.
6753 * This means that we actually need to count the number of elements in the
6754 * 'declarations' list in each of the elements.
6756 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6757 decl_count
+= decl_list
->declarations
.length();
6760 /* Allocate storage for the fields and process the field
6761 * declarations. As the declarations are processed, try to also convert
6762 * the types to HIR. This ensures that structure definitions embedded in
6763 * other structure definitions or in interface blocks are processed.
6765 glsl_struct_field
*const fields
= rzalloc_array(state
, glsl_struct_field
,
6768 bool first_member
= true;
6769 bool first_member_has_explicit_location
= false;
6772 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
6773 const char *type_name
;
6774 YYLTYPE loc
= decl_list
->get_location();
6776 decl_list
->type
->specifier
->hir(instructions
, state
);
6778 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
6780 * "Anonymous structures are not supported; so embedded structures
6781 * must have a declarator. A name given to an embedded struct is
6782 * scoped at the same level as the struct it is embedded in."
6784 * The same section of the GLSL 1.20 spec says:
6786 * "Anonymous structures are not supported. Embedded structures are
6789 * The GLSL ES 1.00 and 3.00 specs have similar langauge. So, we allow
6790 * embedded structures in 1.10 only.
6792 if (state
->language_version
!= 110 &&
6793 decl_list
->type
->specifier
->structure
!= NULL
)
6794 _mesa_glsl_error(&loc
, state
,
6795 "embedded structure declarations are not allowed");
6797 const glsl_type
*decl_type
=
6798 decl_list
->type
->glsl_type(& type_name
, state
);
6800 const struct ast_type_qualifier
*const qual
=
6801 &decl_list
->type
->qualifier
;
6803 /* From section 4.3.9 of the GLSL 4.40 spec:
6805 * "[In interface blocks] opaque types are not allowed."
6807 * It should be impossible for decl_type to be NULL here. Cases that
6808 * might naturally lead to decl_type being NULL, especially for the
6809 * is_interface case, will have resulted in compilation having
6810 * already halted due to a syntax error.
6815 if (decl_type
->contains_opaque()) {
6816 _mesa_glsl_error(&loc
, state
, "uniform/buffer in non-default "
6817 "interface block contains opaque variable");
6820 if (decl_type
->contains_atomic()) {
6821 /* From section 4.1.7.3 of the GLSL 4.40 spec:
6823 * "Members of structures cannot be declared as atomic counter
6826 _mesa_glsl_error(&loc
, state
, "atomic counter in structure");
6829 if (decl_type
->contains_image()) {
6830 /* FINISHME: Same problem as with atomic counters.
6831 * FINISHME: Request clarification from Khronos and add
6832 * FINISHME: spec quotation here.
6834 _mesa_glsl_error(&loc
, state
, "image in structure");
6838 if (qual
->flags
.q
.explicit_binding
) {
6839 _mesa_glsl_error(&loc
, state
,
6840 "binding layout qualifier cannot be applied "
6841 "to struct or interface block members");
6845 if (!first_member
) {
6846 if (!layout
->flags
.q
.explicit_location
&&
6847 ((first_member_has_explicit_location
&&
6848 !qual
->flags
.q
.explicit_location
) ||
6849 (!first_member_has_explicit_location
&&
6850 qual
->flags
.q
.explicit_location
))) {
6851 _mesa_glsl_error(&loc
, state
,
6852 "when block-level location layout qualifier "
6853 "is not supplied either all members must "
6854 "have a location layout qualifier or all "
6855 "members must not have a location layout "
6859 first_member
= false;
6860 first_member_has_explicit_location
=
6861 qual
->flags
.q
.explicit_location
;
6865 if (qual
->flags
.q
.std140
||
6866 qual
->flags
.q
.std430
||
6867 qual
->flags
.q
.packed
||
6868 qual
->flags
.q
.shared
) {
6869 _mesa_glsl_error(&loc
, state
,
6870 "uniform/shader storage block layout qualifiers "
6871 "std140, std430, packed, and shared can only be "
6872 "applied to uniform/shader storage blocks, not "
6876 if (qual
->flags
.q
.constant
) {
6877 _mesa_glsl_error(&loc
, state
,
6878 "const storage qualifier cannot be applied "
6879 "to struct or interface block members");
6882 /* From Section 4.4.2.3 (Geometry Outputs) of the GLSL 4.50 spec:
6884 * "A block member may be declared with a stream identifier, but
6885 * the specified stream must match the stream associated with the
6886 * containing block."
6888 if (qual
->flags
.q
.explicit_stream
) {
6889 unsigned qual_stream
;
6890 if (process_qualifier_constant(state
, &loc
, "stream",
6891 qual
->stream
, &qual_stream
) &&
6892 qual_stream
!= block_stream
) {
6893 _mesa_glsl_error(&loc
, state
, "stream layout qualifier on "
6894 "interface block member does not match "
6895 "the interface block (%u vs %u)", qual_stream
,
6901 unsigned explicit_xfb_buffer
= 0;
6902 if (qual
->flags
.q
.explicit_xfb_buffer
) {
6903 unsigned qual_xfb_buffer
;
6904 if (process_qualifier_constant(state
, &loc
, "xfb_buffer",
6905 qual
->xfb_buffer
, &qual_xfb_buffer
)) {
6906 explicit_xfb_buffer
= 1;
6907 if (qual_xfb_buffer
!= block_xfb_buffer
)
6908 _mesa_glsl_error(&loc
, state
, "xfb_buffer layout qualifier on "
6909 "interface block member does not match "
6910 "the interface block (%u vs %u)",
6911 qual_xfb_buffer
, block_xfb_buffer
);
6913 xfb_buffer
= (int) qual_xfb_buffer
;
6916 explicit_xfb_buffer
= layout
->flags
.q
.explicit_xfb_buffer
;
6917 xfb_buffer
= (int) block_xfb_buffer
;
6920 int xfb_stride
= -1;
6921 if (qual
->flags
.q
.explicit_xfb_stride
) {
6922 unsigned qual_xfb_stride
;
6923 if (process_qualifier_constant(state
, &loc
, "xfb_stride",
6924 qual
->xfb_stride
, &qual_xfb_stride
)) {
6925 xfb_stride
= (int) qual_xfb_stride
;
6929 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
6930 _mesa_glsl_error(&loc
, state
,
6931 "interpolation qualifiers cannot be used "
6932 "with uniform interface blocks");
6935 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
6936 qual
->has_auxiliary_storage()) {
6937 _mesa_glsl_error(&loc
, state
,
6938 "auxiliary storage qualifiers cannot be used "
6939 "in uniform blocks or structures.");
6942 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
6943 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
6944 _mesa_glsl_error(&loc
, state
,
6945 "row_major and column_major can only be "
6946 "applied to interface blocks");
6948 validate_matrix_layout_for_type(state
, &loc
, decl_type
, NULL
);
6951 if (qual
->flags
.q
.read_only
&& qual
->flags
.q
.write_only
) {
6952 _mesa_glsl_error(&loc
, state
, "buffer variable can't be both "
6953 "readonly and writeonly.");
6956 foreach_list_typed (ast_declaration
, decl
, link
,
6957 &decl_list
->declarations
) {
6958 YYLTYPE loc
= decl
->get_location();
6960 if (!allow_reserved_names
)
6961 validate_identifier(decl
->identifier
, loc
, state
);
6963 const struct glsl_type
*field_type
=
6964 process_array_type(&loc
, decl_type
, decl
->array_specifier
, state
);
6965 validate_array_dimensions(field_type
, state
, &loc
);
6966 fields
[i
].type
= field_type
;
6967 fields
[i
].name
= decl
->identifier
;
6968 fields
[i
].interpolation
=
6969 interpret_interpolation_qualifier(qual
, field_type
,
6970 var_mode
, state
, &loc
);
6971 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
6972 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
6973 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
6974 fields
[i
].precision
= qual
->precision
;
6975 fields
[i
].offset
= -1;
6976 fields
[i
].explicit_xfb_buffer
= explicit_xfb_buffer
;
6977 fields
[i
].xfb_buffer
= xfb_buffer
;
6978 fields
[i
].xfb_stride
= xfb_stride
;
6980 if (qual
->flags
.q
.explicit_location
) {
6981 unsigned qual_location
;
6982 if (process_qualifier_constant(state
, &loc
, "location",
6983 qual
->location
, &qual_location
)) {
6984 fields
[i
].location
= qual_location
+
6985 (fields
[i
].patch
? VARYING_SLOT_PATCH0
: VARYING_SLOT_VAR0
);
6986 expl_location
= fields
[i
].location
+
6987 fields
[i
].type
->count_attribute_slots(false);
6990 if (layout
&& layout
->flags
.q
.explicit_location
) {
6991 fields
[i
].location
= expl_location
;
6992 expl_location
+= fields
[i
].type
->count_attribute_slots(false);
6994 fields
[i
].location
= -1;
6998 /* Offset can only be used with std430 and std140 layouts an initial
6999 * value of 0 is used for error detection.
7005 if (qual
->flags
.q
.row_major
||
7006 matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
) {
7012 if(layout
->flags
.q
.std140
) {
7013 align
= field_type
->std140_base_alignment(row_major
);
7014 size
= field_type
->std140_size(row_major
);
7015 } else if (layout
->flags
.q
.std430
) {
7016 align
= field_type
->std430_base_alignment(row_major
);
7017 size
= field_type
->std430_size(row_major
);
7021 if (qual
->flags
.q
.explicit_offset
) {
7022 unsigned qual_offset
;
7023 if (process_qualifier_constant(state
, &loc
, "offset",
7024 qual
->offset
, &qual_offset
)) {
7025 if (align
!= 0 && size
!= 0) {
7026 if (next_offset
> qual_offset
)
7027 _mesa_glsl_error(&loc
, state
, "layout qualifier "
7028 "offset overlaps previous member");
7030 if (qual_offset
% align
) {
7031 _mesa_glsl_error(&loc
, state
, "layout qualifier offset "
7032 "must be a multiple of the base "
7033 "alignment of %s", field_type
->name
);
7035 fields
[i
].offset
= qual_offset
;
7036 next_offset
= glsl_align(qual_offset
+ size
, align
);
7038 _mesa_glsl_error(&loc
, state
, "offset can only be used "
7039 "with std430 and std140 layouts");
7044 if (qual
->flags
.q
.explicit_align
|| expl_align
!= 0) {
7045 unsigned offset
= fields
[i
].offset
!= -1 ? fields
[i
].offset
:
7047 if (align
== 0 || size
== 0) {
7048 _mesa_glsl_error(&loc
, state
, "align can only be used with "
7049 "std430 and std140 layouts");
7050 } else if (qual
->flags
.q
.explicit_align
) {
7051 unsigned member_align
;
7052 if (process_qualifier_constant(state
, &loc
, "align",
7053 qual
->align
, &member_align
)) {
7054 if (member_align
== 0 ||
7055 member_align
& (member_align
- 1)) {
7056 _mesa_glsl_error(&loc
, state
, "align layout qualifier "
7057 "in not a power of 2");
7059 fields
[i
].offset
= glsl_align(offset
, member_align
);
7060 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7064 fields
[i
].offset
= glsl_align(offset
, expl_align
);
7065 next_offset
= glsl_align(fields
[i
].offset
+ size
, align
);
7067 } else if (!qual
->flags
.q
.explicit_offset
) {
7068 if (align
!= 0 && size
!= 0)
7069 next_offset
= glsl_align(next_offset
+ size
, align
);
7072 /* From the ARB_enhanced_layouts spec:
7074 * "The given offset applies to the first component of the first
7075 * member of the qualified entity. Then, within the qualified
7076 * entity, subsequent components are each assigned, in order, to
7077 * the next available offset aligned to a multiple of that
7078 * component's size. Aggregate types are flattened down to the
7079 * component level to get this sequence of components."
7081 if (qual
->flags
.q
.explicit_xfb_offset
) {
7082 unsigned xfb_offset
;
7083 if (process_qualifier_constant(state
, &loc
, "xfb_offset",
7084 qual
->offset
, &xfb_offset
)) {
7085 fields
[i
].offset
= xfb_offset
;
7086 block_xfb_offset
= fields
[i
].offset
+
7087 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
7090 if (layout
&& layout
->flags
.q
.explicit_xfb_offset
) {
7091 unsigned align
= field_type
->is_64bit() ? 8 : 4;
7092 fields
[i
].offset
= glsl_align(block_xfb_offset
, align
);
7094 MAX2(xfb_stride
, (int) (4 * field_type
->component_slots()));
7098 /* Propogate row- / column-major information down the fields of the
7099 * structure or interface block. Structures need this data because
7100 * the structure may contain a structure that contains ... a matrix
7101 * that need the proper layout.
7103 if (is_interface
&& layout
&&
7104 (layout
->flags
.q
.uniform
|| layout
->flags
.q
.buffer
) &&
7105 (field_type
->without_array()->is_matrix()
7106 || field_type
->without_array()->is_record())) {
7107 /* If no layout is specified for the field, inherit the layout
7110 fields
[i
].matrix_layout
= matrix_layout
;
7112 if (qual
->flags
.q
.row_major
)
7113 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7114 else if (qual
->flags
.q
.column_major
)
7115 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7117 /* If we're processing an uniform or buffer block, the matrix
7118 * layout must be decided by this point.
7120 assert(fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
7121 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
7124 /* Image qualifiers are allowed on buffer variables, which can only
7125 * be defined inside shader storage buffer objects
7127 if (layout
&& var_mode
== ir_var_shader_storage
) {
7128 /* For readonly and writeonly qualifiers the field definition,
7129 * if set, overwrites the layout qualifier.
7131 if (qual
->flags
.q
.read_only
) {
7132 fields
[i
].image_read_only
= true;
7133 fields
[i
].image_write_only
= false;
7134 } else if (qual
->flags
.q
.write_only
) {
7135 fields
[i
].image_read_only
= false;
7136 fields
[i
].image_write_only
= true;
7138 fields
[i
].image_read_only
= layout
->flags
.q
.read_only
;
7139 fields
[i
].image_write_only
= layout
->flags
.q
.write_only
;
7142 /* For other qualifiers, we set the flag if either the layout
7143 * qualifier or the field qualifier are set
7145 fields
[i
].image_coherent
= qual
->flags
.q
.coherent
||
7146 layout
->flags
.q
.coherent
;
7147 fields
[i
].image_volatile
= qual
->flags
.q
._volatile
||
7148 layout
->flags
.q
._volatile
;
7149 fields
[i
].image_restrict
= qual
->flags
.q
.restrict_flag
||
7150 layout
->flags
.q
.restrict_flag
;
7157 assert(i
== decl_count
);
7159 *fields_ret
= fields
;
7165 ast_struct_specifier::hir(exec_list
*instructions
,
7166 struct _mesa_glsl_parse_state
*state
)
7168 YYLTYPE loc
= this->get_location();
7170 unsigned expl_location
= 0;
7171 if (layout
&& layout
->flags
.q
.explicit_location
) {
7172 if (!process_qualifier_constant(state
, &loc
, "location",
7173 layout
->location
, &expl_location
)) {
7176 expl_location
= VARYING_SLOT_VAR0
+ expl_location
;
7180 glsl_struct_field
*fields
;
7181 unsigned decl_count
=
7182 ast_process_struct_or_iface_block_members(instructions
,
7184 &this->declarations
,
7187 GLSL_MATRIX_LAYOUT_INHERITED
,
7188 false /* allow_reserved_names */,
7191 0, /* for interface only */
7192 0, /* for interface only */
7193 0, /* for interface only */
7195 0 /* for interface only */);
7197 validate_identifier(this->name
, loc
, state
);
7199 const glsl_type
*t
=
7200 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
7202 if (!state
->symbols
->add_type(name
, t
)) {
7203 const glsl_type
*match
= state
->symbols
->get_type(name
);
7204 /* allow struct matching for desktop GL - older UE4 does this */
7205 if (match
!= NULL
&& state
->is_version(130, 0) && match
->record_compare(t
, false))
7206 _mesa_glsl_warning(& loc
, state
, "struct `%s' previously defined", name
);
7208 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
7210 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
7212 state
->num_user_structures
+ 1);
7214 s
[state
->num_user_structures
] = t
;
7215 state
->user_structures
= s
;
7216 state
->num_user_structures
++;
7220 /* Structure type definitions do not have r-values.
7227 * Visitor class which detects whether a given interface block has been used.
7229 class interface_block_usage_visitor
: public ir_hierarchical_visitor
7232 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
7233 : mode(mode
), block(block
), found(false)
7237 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
7239 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
7243 return visit_continue
;
7246 bool usage_found() const
7252 ir_variable_mode mode
;
7253 const glsl_type
*block
;
7258 is_unsized_array_last_element(ir_variable
*v
)
7260 const glsl_type
*interface_type
= v
->get_interface_type();
7261 int length
= interface_type
->length
;
7263 assert(v
->type
->is_unsized_array());
7265 /* Check if it is the last element of the interface */
7266 if (strcmp(interface_type
->fields
.structure
[length
-1].name
, v
->name
) == 0)
7272 apply_memory_qualifiers(ir_variable
*var
, glsl_struct_field field
)
7274 var
->data
.image_read_only
= field
.image_read_only
;
7275 var
->data
.image_write_only
= field
.image_write_only
;
7276 var
->data
.image_coherent
= field
.image_coherent
;
7277 var
->data
.image_volatile
= field
.image_volatile
;
7278 var
->data
.image_restrict
= field
.image_restrict
;
7282 ast_interface_block::hir(exec_list
*instructions
,
7283 struct _mesa_glsl_parse_state
*state
)
7285 YYLTYPE loc
= this->get_location();
7287 /* Interface blocks must be declared at global scope */
7288 if (state
->current_function
!= NULL
) {
7289 _mesa_glsl_error(&loc
, state
,
7290 "Interface block `%s' must be declared "
7295 /* Validate qualifiers:
7297 * - Layout Qualifiers as per the table in Section 4.4
7298 * ("Layout Qualifiers") of the GLSL 4.50 spec.
7300 * - Memory Qualifiers as per Section 4.10 ("Memory Qualifiers") of the
7303 * "Additionally, memory qualifiers may also be used in the declaration
7304 * of shader storage blocks"
7306 * Note the table in Section 4.4 says std430 is allowed on both uniform and
7307 * buffer blocks however Section 4.4.5 (Uniform and Shader Storage Block
7308 * Layout Qualifiers) of the GLSL 4.50 spec says:
7310 * "The std430 qualifier is supported only for shader storage blocks;
7311 * using std430 on a uniform block will result in a compile-time error."
7313 ast_type_qualifier allowed_blk_qualifiers
;
7314 allowed_blk_qualifiers
.flags
.i
= 0;
7315 if (this->layout
.flags
.q
.buffer
|| this->layout
.flags
.q
.uniform
) {
7316 allowed_blk_qualifiers
.flags
.q
.shared
= 1;
7317 allowed_blk_qualifiers
.flags
.q
.packed
= 1;
7318 allowed_blk_qualifiers
.flags
.q
.std140
= 1;
7319 allowed_blk_qualifiers
.flags
.q
.row_major
= 1;
7320 allowed_blk_qualifiers
.flags
.q
.column_major
= 1;
7321 allowed_blk_qualifiers
.flags
.q
.explicit_align
= 1;
7322 allowed_blk_qualifiers
.flags
.q
.explicit_binding
= 1;
7323 if (this->layout
.flags
.q
.buffer
) {
7324 allowed_blk_qualifiers
.flags
.q
.buffer
= 1;
7325 allowed_blk_qualifiers
.flags
.q
.std430
= 1;
7326 allowed_blk_qualifiers
.flags
.q
.coherent
= 1;
7327 allowed_blk_qualifiers
.flags
.q
._volatile
= 1;
7328 allowed_blk_qualifiers
.flags
.q
.restrict_flag
= 1;
7329 allowed_blk_qualifiers
.flags
.q
.read_only
= 1;
7330 allowed_blk_qualifiers
.flags
.q
.write_only
= 1;
7332 allowed_blk_qualifiers
.flags
.q
.uniform
= 1;
7335 /* Interface block */
7336 assert(this->layout
.flags
.q
.in
|| this->layout
.flags
.q
.out
);
7338 allowed_blk_qualifiers
.flags
.q
.explicit_location
= 1;
7339 if (this->layout
.flags
.q
.out
) {
7340 allowed_blk_qualifiers
.flags
.q
.out
= 1;
7341 if (state
->stage
== MESA_SHADER_GEOMETRY
||
7342 state
->stage
== MESA_SHADER_TESS_CTRL
||
7343 state
->stage
== MESA_SHADER_TESS_EVAL
||
7344 state
->stage
== MESA_SHADER_VERTEX
) {
7345 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_offset
= 1;
7346 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_buffer
= 1;
7347 allowed_blk_qualifiers
.flags
.q
.xfb_buffer
= 1;
7348 allowed_blk_qualifiers
.flags
.q
.explicit_xfb_stride
= 1;
7349 allowed_blk_qualifiers
.flags
.q
.xfb_stride
= 1;
7350 if (state
->stage
== MESA_SHADER_GEOMETRY
) {
7351 allowed_blk_qualifiers
.flags
.q
.stream
= 1;
7352 allowed_blk_qualifiers
.flags
.q
.explicit_stream
= 1;
7354 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7355 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7359 allowed_blk_qualifiers
.flags
.q
.in
= 1;
7360 if (state
->stage
== MESA_SHADER_TESS_EVAL
) {
7361 allowed_blk_qualifiers
.flags
.q
.patch
= 1;
7366 this->layout
.validate_flags(&loc
, state
, allowed_blk_qualifiers
,
7367 "invalid qualifier for block",
7370 /* The ast_interface_block has a list of ast_declarator_lists. We
7371 * need to turn those into ir_variables with an association
7372 * with this uniform block.
7374 enum glsl_interface_packing packing
;
7375 if (this->layout
.flags
.q
.shared
) {
7376 packing
= GLSL_INTERFACE_PACKING_SHARED
;
7377 } else if (this->layout
.flags
.q
.packed
) {
7378 packing
= GLSL_INTERFACE_PACKING_PACKED
;
7379 } else if (this->layout
.flags
.q
.std430
) {
7380 packing
= GLSL_INTERFACE_PACKING_STD430
;
7382 /* The default layout is std140.
7384 packing
= GLSL_INTERFACE_PACKING_STD140
;
7387 ir_variable_mode var_mode
;
7388 const char *iface_type_name
;
7389 if (this->layout
.flags
.q
.in
) {
7390 var_mode
= ir_var_shader_in
;
7391 iface_type_name
= "in";
7392 } else if (this->layout
.flags
.q
.out
) {
7393 var_mode
= ir_var_shader_out
;
7394 iface_type_name
= "out";
7395 } else if (this->layout
.flags
.q
.uniform
) {
7396 var_mode
= ir_var_uniform
;
7397 iface_type_name
= "uniform";
7398 } else if (this->layout
.flags
.q
.buffer
) {
7399 var_mode
= ir_var_shader_storage
;
7400 iface_type_name
= "buffer";
7402 var_mode
= ir_var_auto
;
7403 iface_type_name
= "UNKNOWN";
7404 assert(!"interface block layout qualifier not found!");
7407 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
7408 if (this->layout
.flags
.q
.row_major
)
7409 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
7410 else if (this->layout
.flags
.q
.column_major
)
7411 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
7413 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
7414 exec_list declared_variables
;
7415 glsl_struct_field
*fields
;
7417 /* For blocks that accept memory qualifiers (i.e. shader storage), verify
7418 * that we don't have incompatible qualifiers
7420 if (this->layout
.flags
.q
.read_only
&& this->layout
.flags
.q
.write_only
) {
7421 _mesa_glsl_error(&loc
, state
,
7422 "Interface block sets both readonly and writeonly");
7425 unsigned qual_stream
;
7426 if (!process_qualifier_constant(state
, &loc
, "stream", this->layout
.stream
,
7428 !validate_stream_qualifier(&loc
, state
, qual_stream
)) {
7429 /* If the stream qualifier is invalid it doesn't make sense to continue
7430 * on and try to compare stream layouts on member variables against it
7431 * so just return early.
7436 unsigned qual_xfb_buffer
;
7437 if (!process_qualifier_constant(state
, &loc
, "xfb_buffer",
7438 layout
.xfb_buffer
, &qual_xfb_buffer
) ||
7439 !validate_xfb_buffer_qualifier(&loc
, state
, qual_xfb_buffer
)) {
7443 unsigned qual_xfb_offset
;
7444 if (layout
.flags
.q
.explicit_xfb_offset
) {
7445 if (!process_qualifier_constant(state
, &loc
, "xfb_offset",
7446 layout
.offset
, &qual_xfb_offset
)) {
7451 unsigned qual_xfb_stride
;
7452 if (layout
.flags
.q
.explicit_xfb_stride
) {
7453 if (!process_qualifier_constant(state
, &loc
, "xfb_stride",
7454 layout
.xfb_stride
, &qual_xfb_stride
)) {
7459 unsigned expl_location
= 0;
7460 if (layout
.flags
.q
.explicit_location
) {
7461 if (!process_qualifier_constant(state
, &loc
, "location",
7462 layout
.location
, &expl_location
)) {
7465 expl_location
+= this->layout
.flags
.q
.patch
? VARYING_SLOT_PATCH0
7466 : VARYING_SLOT_VAR0
;
7470 unsigned expl_align
= 0;
7471 if (layout
.flags
.q
.explicit_align
) {
7472 if (!process_qualifier_constant(state
, &loc
, "align",
7473 layout
.align
, &expl_align
)) {
7476 if (expl_align
== 0 || expl_align
& (expl_align
- 1)) {
7477 _mesa_glsl_error(&loc
, state
, "align layout qualifier in not a "
7484 unsigned int num_variables
=
7485 ast_process_struct_or_iface_block_members(&declared_variables
,
7487 &this->declarations
,
7491 redeclaring_per_vertex
,
7500 if (!redeclaring_per_vertex
) {
7501 validate_identifier(this->block_name
, loc
, state
);
7503 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
7505 * "Block names have no other use within a shader beyond interface
7506 * matching; it is a compile-time error to use a block name at global
7507 * scope for anything other than as a block name."
7509 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
7510 if (var
&& !var
->type
->is_interface()) {
7511 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
7512 "already used in the scope.",
7517 const glsl_type
*earlier_per_vertex
= NULL
;
7518 if (redeclaring_per_vertex
) {
7519 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
7520 * the named interface block gl_in, we can find it by looking at the
7521 * previous declaration of gl_in. Otherwise we can find it by looking
7522 * at the previous decalartion of any of the built-in outputs,
7525 * Also check that the instance name and array-ness of the redeclaration
7529 case ir_var_shader_in
:
7530 if (ir_variable
*earlier_gl_in
=
7531 state
->symbols
->get_variable("gl_in")) {
7532 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
7534 _mesa_glsl_error(&loc
, state
,
7535 "redeclaration of gl_PerVertex input not allowed "
7537 _mesa_shader_stage_to_string(state
->stage
));
7539 if (this->instance_name
== NULL
||
7540 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
||
7541 !this->array_specifier
->is_single_dimension()) {
7542 _mesa_glsl_error(&loc
, state
,
7543 "gl_PerVertex input must be redeclared as "
7547 case ir_var_shader_out
:
7548 if (ir_variable
*earlier_gl_Position
=
7549 state
->symbols
->get_variable("gl_Position")) {
7550 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
7551 } else if (ir_variable
*earlier_gl_out
=
7552 state
->symbols
->get_variable("gl_out")) {
7553 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
7555 _mesa_glsl_error(&loc
, state
,
7556 "redeclaration of gl_PerVertex output not "
7557 "allowed in the %s shader",
7558 _mesa_shader_stage_to_string(state
->stage
));
7560 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
7561 if (this->instance_name
== NULL
||
7562 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
7563 _mesa_glsl_error(&loc
, state
,
7564 "gl_PerVertex output must be redeclared as "
7568 if (this->instance_name
!= NULL
) {
7569 _mesa_glsl_error(&loc
, state
,
7570 "gl_PerVertex output may not be redeclared with "
7571 "an instance name");
7576 _mesa_glsl_error(&loc
, state
,
7577 "gl_PerVertex must be declared as an input or an "
7582 if (earlier_per_vertex
== NULL
) {
7583 /* An error has already been reported. Bail out to avoid null
7584 * dereferences later in this function.
7589 /* Copy locations from the old gl_PerVertex interface block. */
7590 for (unsigned i
= 0; i
< num_variables
; i
++) {
7591 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
7593 _mesa_glsl_error(&loc
, state
,
7594 "redeclaration of gl_PerVertex must be a subset "
7595 "of the built-in members of gl_PerVertex");
7597 fields
[i
].location
=
7598 earlier_per_vertex
->fields
.structure
[j
].location
;
7600 earlier_per_vertex
->fields
.structure
[j
].offset
;
7601 fields
[i
].interpolation
=
7602 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
7603 fields
[i
].centroid
=
7604 earlier_per_vertex
->fields
.structure
[j
].centroid
;
7606 earlier_per_vertex
->fields
.structure
[j
].sample
;
7608 earlier_per_vertex
->fields
.structure
[j
].patch
;
7609 fields
[i
].precision
=
7610 earlier_per_vertex
->fields
.structure
[j
].precision
;
7611 fields
[i
].explicit_xfb_buffer
=
7612 earlier_per_vertex
->fields
.structure
[j
].explicit_xfb_buffer
;
7613 fields
[i
].xfb_buffer
=
7614 earlier_per_vertex
->fields
.structure
[j
].xfb_buffer
;
7615 fields
[i
].xfb_stride
=
7616 earlier_per_vertex
->fields
.structure
[j
].xfb_stride
;
7620 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
7623 * If a built-in interface block is redeclared, it must appear in
7624 * the shader before any use of any member included in the built-in
7625 * declaration, or a compilation error will result.
7627 * This appears to be a clarification to the behaviour established for
7628 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
7629 * regardless of GLSL version.
7631 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
7632 v
.run(instructions
);
7633 if (v
.usage_found()) {
7634 _mesa_glsl_error(&loc
, state
,
7635 "redeclaration of a built-in interface block must "
7636 "appear before any use of any member of the "
7641 const glsl_type
*block_type
=
7642 glsl_type::get_interface_instance(fields
,
7646 GLSL_MATRIX_LAYOUT_ROW_MAJOR
,
7649 unsigned component_size
= block_type
->contains_double() ? 8 : 4;
7651 layout
.flags
.q
.explicit_xfb_offset
? (int) qual_xfb_offset
: -1;
7652 validate_xfb_offset_qualifier(&loc
, state
, xfb_offset
, block_type
,
7655 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
7656 YYLTYPE loc
= this->get_location();
7657 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
7658 "already taken in the current scope",
7659 this->block_name
, iface_type_name
);
7662 /* Since interface blocks cannot contain statements, it should be
7663 * impossible for the block to generate any instructions.
7665 assert(declared_variables
.is_empty());
7667 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
7669 * Geometry shader input variables get the per-vertex values written
7670 * out by vertex shader output variables of the same names. Since a
7671 * geometry shader operates on a set of vertices, each input varying
7672 * variable (or input block, see interface blocks below) needs to be
7673 * declared as an array.
7675 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
7676 var_mode
== ir_var_shader_in
) {
7677 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
7678 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7679 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
7680 !this->layout
.flags
.q
.patch
&&
7681 this->array_specifier
== NULL
&&
7682 var_mode
== ir_var_shader_in
) {
7683 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
7684 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
7685 !this->layout
.flags
.q
.patch
&&
7686 this->array_specifier
== NULL
&&
7687 var_mode
== ir_var_shader_out
) {
7688 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
7692 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
7695 * "If an instance name (instance-name) is used, then it puts all the
7696 * members inside a scope within its own name space, accessed with the
7697 * field selector ( . ) operator (analogously to structures)."
7699 if (this->instance_name
) {
7700 if (redeclaring_per_vertex
) {
7701 /* When a built-in in an unnamed interface block is redeclared,
7702 * get_variable_being_redeclared() calls
7703 * check_builtin_array_max_size() to make sure that built-in array
7704 * variables aren't redeclared to illegal sizes. But we're looking
7705 * at a redeclaration of a named built-in interface block. So we
7706 * have to manually call check_builtin_array_max_size() for all parts
7707 * of the interface that are arrays.
7709 for (unsigned i
= 0; i
< num_variables
; i
++) {
7710 if (fields
[i
].type
->is_array()) {
7711 const unsigned size
= fields
[i
].type
->array_size();
7712 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
7716 validate_identifier(this->instance_name
, loc
, state
);
7721 if (this->array_specifier
!= NULL
) {
7722 const glsl_type
*block_array_type
=
7723 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
7725 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
7727 * For uniform blocks declared an array, each individual array
7728 * element corresponds to a separate buffer object backing one
7729 * instance of the block. As the array size indicates the number
7730 * of buffer objects needed, uniform block array declarations
7731 * must specify an array size.
7733 * And a few paragraphs later:
7735 * Geometry shader input blocks must be declared as arrays and
7736 * follow the array declaration and linking rules for all
7737 * geometry shader inputs. All other input and output block
7738 * arrays must specify an array size.
7740 * The same applies to tessellation shaders.
7742 * The upshot of this is that the only circumstance where an
7743 * interface array size *doesn't* need to be specified is on a
7744 * geometry shader input, tessellation control shader input,
7745 * tessellation control shader output, and tessellation evaluation
7748 if (block_array_type
->is_unsized_array()) {
7749 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
7750 state
->stage
== MESA_SHADER_TESS_CTRL
||
7751 state
->stage
== MESA_SHADER_TESS_EVAL
;
7752 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
7754 if (this->layout
.flags
.q
.in
) {
7756 _mesa_glsl_error(&loc
, state
,
7757 "unsized input block arrays not allowed in "
7759 _mesa_shader_stage_to_string(state
->stage
));
7760 } else if (this->layout
.flags
.q
.out
) {
7762 _mesa_glsl_error(&loc
, state
,
7763 "unsized output block arrays not allowed in "
7765 _mesa_shader_stage_to_string(state
->stage
));
7767 /* by elimination, this is a uniform block array */
7768 _mesa_glsl_error(&loc
, state
,
7769 "unsized uniform block arrays not allowed in "
7771 _mesa_shader_stage_to_string(state
->stage
));
7775 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
7777 * * Arrays of arrays of blocks are not allowed
7779 if (state
->es_shader
&& block_array_type
->is_array() &&
7780 block_array_type
->fields
.array
->is_array()) {
7781 _mesa_glsl_error(&loc
, state
,
7782 "arrays of arrays interface blocks are "
7786 var
= new(state
) ir_variable(block_array_type
,
7787 this->instance_name
,
7790 var
= new(state
) ir_variable(block_type
,
7791 this->instance_name
,
7795 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7796 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7798 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7799 var
->data
.read_only
= true;
7801 var
->data
.patch
= this->layout
.flags
.q
.patch
;
7803 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
7804 handle_geometry_shader_input_decl(state
, loc
, var
);
7805 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
7806 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
7807 handle_tess_shader_input_decl(state
, loc
, var
);
7808 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
7809 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
7811 for (unsigned i
= 0; i
< num_variables
; i
++) {
7812 if (var
->data
.mode
== ir_var_shader_storage
)
7813 apply_memory_qualifiers(var
, fields
[i
]);
7816 if (ir_variable
*earlier
=
7817 state
->symbols
->get_variable(this->instance_name
)) {
7818 if (!redeclaring_per_vertex
) {
7819 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
7820 this->instance_name
);
7822 earlier
->data
.how_declared
= ir_var_declared_normally
;
7823 earlier
->type
= var
->type
;
7824 earlier
->reinit_interface_type(block_type
);
7827 if (this->layout
.flags
.q
.explicit_binding
) {
7828 apply_explicit_binding(state
, &loc
, var
, var
->type
,
7832 var
->data
.stream
= qual_stream
;
7833 if (layout
.flags
.q
.explicit_location
) {
7834 var
->data
.location
= expl_location
;
7835 var
->data
.explicit_location
= true;
7838 state
->symbols
->add_variable(var
);
7839 instructions
->push_tail(var
);
7842 /* In order to have an array size, the block must also be declared with
7845 assert(this->array_specifier
== NULL
);
7847 for (unsigned i
= 0; i
< num_variables
; i
++) {
7849 new(state
) ir_variable(fields
[i
].type
,
7850 ralloc_strdup(state
, fields
[i
].name
),
7852 var
->data
.interpolation
= fields
[i
].interpolation
;
7853 var
->data
.centroid
= fields
[i
].centroid
;
7854 var
->data
.sample
= fields
[i
].sample
;
7855 var
->data
.patch
= fields
[i
].patch
;
7856 var
->data
.stream
= qual_stream
;
7857 var
->data
.location
= fields
[i
].location
;
7859 if (fields
[i
].location
!= -1)
7860 var
->data
.explicit_location
= true;
7862 var
->data
.explicit_xfb_buffer
= fields
[i
].explicit_xfb_buffer
;
7863 var
->data
.xfb_buffer
= fields
[i
].xfb_buffer
;
7865 if (fields
[i
].offset
!= -1)
7866 var
->data
.explicit_xfb_offset
= true;
7867 var
->data
.offset
= fields
[i
].offset
;
7869 var
->init_interface_type(block_type
);
7871 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
7872 var
->data
.read_only
= true;
7874 /* Precision qualifiers do not have any meaning in Desktop GLSL */
7875 if (state
->es_shader
) {
7876 var
->data
.precision
=
7877 select_gles_precision(fields
[i
].precision
, fields
[i
].type
,
7881 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
7882 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
7883 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
7885 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
7888 if (var
->data
.mode
== ir_var_shader_storage
)
7889 apply_memory_qualifiers(var
, fields
[i
]);
7891 /* Examine var name here since var may get deleted in the next call */
7892 bool var_is_gl_id
= is_gl_identifier(var
->name
);
7894 if (redeclaring_per_vertex
) {
7895 bool is_redeclaration
;
7896 ir_variable
*declared_var
=
7897 get_variable_being_redeclared(var
, loc
, state
,
7898 true /* allow_all_redeclarations */,
7900 if (!var_is_gl_id
|| !is_redeclaration
) {
7901 _mesa_glsl_error(&loc
, state
,
7902 "redeclaration of gl_PerVertex can only "
7903 "include built-in variables");
7904 } else if (declared_var
->data
.how_declared
== ir_var_declared_normally
) {
7905 _mesa_glsl_error(&loc
, state
,
7906 "`%s' has already been redeclared",
7907 declared_var
->name
);
7909 declared_var
->data
.how_declared
= ir_var_declared_in_block
;
7910 declared_var
->reinit_interface_type(block_type
);
7915 if (state
->symbols
->get_variable(var
->name
) != NULL
)
7916 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
7918 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
7919 * The UBO declaration itself doesn't get an ir_variable unless it
7920 * has an instance name. This is ugly.
7922 if (this->layout
.flags
.q
.explicit_binding
) {
7923 apply_explicit_binding(state
, &loc
, var
,
7924 var
->get_interface_type(), &this->layout
);
7927 if (var
->type
->is_unsized_array()) {
7928 if (var
->is_in_shader_storage_block() &&
7929 is_unsized_array_last_element(var
)) {
7930 var
->data
.from_ssbo_unsized_array
= true;
7932 /* From GLSL ES 3.10 spec, section 4.1.9 "Arrays":
7934 * "If an array is declared as the last member of a shader storage
7935 * block and the size is not specified at compile-time, it is
7936 * sized at run-time. In all other cases, arrays are sized only
7939 * In desktop GLSL it is allowed to have unsized-arrays that are
7940 * not last, as long as we can determine that they are implicitly
7943 if (state
->es_shader
) {
7944 _mesa_glsl_error(&loc
, state
, "unsized array `%s' "
7945 "definition: only last member of a shader "
7946 "storage block can be defined as unsized "
7947 "array", fields
[i
].name
);
7952 state
->symbols
->add_variable(var
);
7953 instructions
->push_tail(var
);
7956 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
7957 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
7959 * It is also a compilation error ... to redeclare a built-in
7960 * block and then use a member from that built-in block that was
7961 * not included in the redeclaration.
7963 * This appears to be a clarification to the behaviour established
7964 * for gl_PerVertex by GLSL 1.50, therefore we implement this
7965 * behaviour regardless of GLSL version.
7967 * To prevent the shader from using a member that was not included in
7968 * the redeclaration, we disable any ir_variables that are still
7969 * associated with the old declaration of gl_PerVertex (since we've
7970 * already updated all of the variables contained in the new
7971 * gl_PerVertex to point to it).
7973 * As a side effect this will prevent
7974 * validate_intrastage_interface_blocks() from getting confused and
7975 * thinking there are conflicting definitions of gl_PerVertex in the
7978 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
7979 ir_variable
*const var
= node
->as_variable();
7981 var
->get_interface_type() == earlier_per_vertex
&&
7982 var
->data
.mode
== var_mode
) {
7983 if (var
->data
.how_declared
== ir_var_declared_normally
) {
7984 _mesa_glsl_error(&loc
, state
,
7985 "redeclaration of gl_PerVertex cannot "
7986 "follow a redeclaration of `%s'",
7989 state
->symbols
->disable_variable(var
->name
);
8001 ast_tcs_output_layout::hir(exec_list
*instructions
,
8002 struct _mesa_glsl_parse_state
*state
)
8004 YYLTYPE loc
= this->get_location();
8006 unsigned num_vertices
;
8007 if (!state
->out_qualifier
->vertices
->
8008 process_qualifier_constant(state
, "vertices", &num_vertices
,
8010 /* return here to stop cascading incorrect error messages */
8014 /* If any shader outputs occurred before this declaration and specified an
8015 * array size, make sure the size they specified is consistent with the
8018 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
8019 _mesa_glsl_error(&loc
, state
,
8020 "this tessellation control shader output layout "
8021 "specifies %u vertices, but a previous output "
8022 "is declared with size %u",
8023 num_vertices
, state
->tcs_output_size
);
8027 state
->tcs_output_vertices_specified
= true;
8029 /* If any shader outputs occurred before this declaration and did not
8030 * specify an array size, their size is determined now.
8032 foreach_in_list (ir_instruction
, node
, instructions
) {
8033 ir_variable
*var
= node
->as_variable();
8034 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
8037 /* Note: Not all tessellation control shader output are arrays. */
8038 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
8041 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8042 _mesa_glsl_error(&loc
, state
,
8043 "this tessellation control shader output layout "
8044 "specifies %u vertices, but an access to element "
8045 "%u of output `%s' already exists", num_vertices
,
8046 var
->data
.max_array_access
, var
->name
);
8048 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8058 ast_gs_input_layout::hir(exec_list
*instructions
,
8059 struct _mesa_glsl_parse_state
*state
)
8061 YYLTYPE loc
= this->get_location();
8063 /* Should have been prevented by the parser. */
8064 assert(!state
->gs_input_prim_type_specified
8065 || state
->in_qualifier
->prim_type
== this->prim_type
);
8067 /* If any shader inputs occurred before this declaration and specified an
8068 * array size, make sure the size they specified is consistent with the
8071 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
8072 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
8073 _mesa_glsl_error(&loc
, state
,
8074 "this geometry shader input layout implies %u vertices"
8075 " per primitive, but a previous input is declared"
8076 " with size %u", num_vertices
, state
->gs_input_size
);
8080 state
->gs_input_prim_type_specified
= true;
8082 /* If any shader inputs occurred before this declaration and did not
8083 * specify an array size, their size is determined now.
8085 foreach_in_list(ir_instruction
, node
, instructions
) {
8086 ir_variable
*var
= node
->as_variable();
8087 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
8090 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
8094 if (var
->type
->is_unsized_array()) {
8095 if (var
->data
.max_array_access
>= (int)num_vertices
) {
8096 _mesa_glsl_error(&loc
, state
,
8097 "this geometry shader input layout implies %u"
8098 " vertices, but an access to element %u of input"
8099 " `%s' already exists", num_vertices
,
8100 var
->data
.max_array_access
, var
->name
);
8102 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
8113 ast_cs_input_layout::hir(exec_list
*instructions
,
8114 struct _mesa_glsl_parse_state
*state
)
8116 YYLTYPE loc
= this->get_location();
8118 /* From the ARB_compute_shader specification:
8120 * If the local size of the shader in any dimension is greater
8121 * than the maximum size supported by the implementation for that
8122 * dimension, a compile-time error results.
8124 * It is not clear from the spec how the error should be reported if
8125 * the total size of the work group exceeds
8126 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
8127 * report it at compile time as well.
8129 GLuint64 total_invocations
= 1;
8130 unsigned qual_local_size
[3];
8131 for (int i
= 0; i
< 3; i
++) {
8133 char *local_size_str
= ralloc_asprintf(NULL
, "invalid local_size_%c",
8135 /* Infer a local_size of 1 for unspecified dimensions */
8136 if (this->local_size
[i
] == NULL
) {
8137 qual_local_size
[i
] = 1;
8138 } else if (!this->local_size
[i
]->
8139 process_qualifier_constant(state
, local_size_str
,
8140 &qual_local_size
[i
], false)) {
8141 ralloc_free(local_size_str
);
8144 ralloc_free(local_size_str
);
8146 if (qual_local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
8147 _mesa_glsl_error(&loc
, state
,
8148 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
8150 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
8153 total_invocations
*= qual_local_size
[i
];
8154 if (total_invocations
>
8155 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
8156 _mesa_glsl_error(&loc
, state
,
8157 "product of local_sizes exceeds "
8158 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
8159 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
8164 /* If any compute input layout declaration preceded this one, make sure it
8165 * was consistent with this one.
8167 if (state
->cs_input_local_size_specified
) {
8168 for (int i
= 0; i
< 3; i
++) {
8169 if (state
->cs_input_local_size
[i
] != qual_local_size
[i
]) {
8170 _mesa_glsl_error(&loc
, state
,
8171 "compute shader input layout does not match"
8172 " previous declaration");
8178 /* The ARB_compute_variable_group_size spec says:
8180 * If a compute shader including a *local_size_variable* qualifier also
8181 * declares a fixed local group size using the *local_size_x*,
8182 * *local_size_y*, or *local_size_z* qualifiers, a compile-time error
8185 if (state
->cs_input_local_size_variable_specified
) {
8186 _mesa_glsl_error(&loc
, state
,
8187 "compute shader can't include both a variable and a "
8188 "fixed local group size");
8192 state
->cs_input_local_size_specified
= true;
8193 for (int i
= 0; i
< 3; i
++)
8194 state
->cs_input_local_size
[i
] = qual_local_size
[i
];
8196 /* We may now declare the built-in constant gl_WorkGroupSize (see
8197 * builtin_variable_generator::generate_constants() for why we didn't
8198 * declare it earlier).
8200 ir_variable
*var
= new(state
->symbols
)
8201 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
8202 var
->data
.how_declared
= ir_var_declared_implicitly
;
8203 var
->data
.read_only
= true;
8204 instructions
->push_tail(var
);
8205 state
->symbols
->add_variable(var
);
8206 ir_constant_data data
;
8207 memset(&data
, 0, sizeof(data
));
8208 for (int i
= 0; i
< 3; i
++)
8209 data
.u
[i
] = qual_local_size
[i
];
8210 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8211 var
->constant_initializer
=
8212 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
8213 var
->data
.has_initializer
= true;
8220 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
8221 exec_list
*instructions
)
8223 bool gl_FragColor_assigned
= false;
8224 bool gl_FragData_assigned
= false;
8225 bool gl_FragSecondaryColor_assigned
= false;
8226 bool gl_FragSecondaryData_assigned
= false;
8227 bool user_defined_fs_output_assigned
= false;
8228 ir_variable
*user_defined_fs_output
= NULL
;
8230 /* It would be nice to have proper location information. */
8232 memset(&loc
, 0, sizeof(loc
));
8234 foreach_in_list(ir_instruction
, node
, instructions
) {
8235 ir_variable
*var
= node
->as_variable();
8237 if (!var
|| !var
->data
.assigned
)
8240 if (strcmp(var
->name
, "gl_FragColor") == 0)
8241 gl_FragColor_assigned
= true;
8242 else if (strcmp(var
->name
, "gl_FragData") == 0)
8243 gl_FragData_assigned
= true;
8244 else if (strcmp(var
->name
, "gl_SecondaryFragColorEXT") == 0)
8245 gl_FragSecondaryColor_assigned
= true;
8246 else if (strcmp(var
->name
, "gl_SecondaryFragDataEXT") == 0)
8247 gl_FragSecondaryData_assigned
= true;
8248 else if (!is_gl_identifier(var
->name
)) {
8249 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
8250 var
->data
.mode
== ir_var_shader_out
) {
8251 user_defined_fs_output_assigned
= true;
8252 user_defined_fs_output
= var
;
8257 /* From the GLSL 1.30 spec:
8259 * "If a shader statically assigns a value to gl_FragColor, it
8260 * may not assign a value to any element of gl_FragData. If a
8261 * shader statically writes a value to any element of
8262 * gl_FragData, it may not assign a value to
8263 * gl_FragColor. That is, a shader may assign values to either
8264 * gl_FragColor or gl_FragData, but not both. Multiple shaders
8265 * linked together must also consistently write just one of
8266 * these variables. Similarly, if user declared output
8267 * variables are in use (statically assigned to), then the
8268 * built-in variables gl_FragColor and gl_FragData may not be
8269 * assigned to. These incorrect usages all generate compile
8272 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
8273 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8274 "`gl_FragColor' and `gl_FragData'");
8275 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
8276 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8277 "`gl_FragColor' and `%s'",
8278 user_defined_fs_output
->name
);
8279 } else if (gl_FragSecondaryColor_assigned
&& gl_FragSecondaryData_assigned
) {
8280 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8281 "`gl_FragSecondaryColorEXT' and"
8282 " `gl_FragSecondaryDataEXT'");
8283 } else if (gl_FragColor_assigned
&& gl_FragSecondaryData_assigned
) {
8284 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8285 "`gl_FragColor' and"
8286 " `gl_FragSecondaryDataEXT'");
8287 } else if (gl_FragData_assigned
&& gl_FragSecondaryColor_assigned
) {
8288 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8290 " `gl_FragSecondaryColorEXT'");
8291 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
8292 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
8293 "`gl_FragData' and `%s'",
8294 user_defined_fs_output
->name
);
8297 if ((gl_FragSecondaryColor_assigned
|| gl_FragSecondaryData_assigned
) &&
8298 !state
->EXT_blend_func_extended_enable
) {
8299 _mesa_glsl_error(&loc
, state
,
8300 "Dual source blending requires EXT_blend_func_extended");
8306 remove_per_vertex_blocks(exec_list
*instructions
,
8307 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
8309 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
8310 * if it exists in this shader type.
8312 const glsl_type
*per_vertex
= NULL
;
8314 case ir_var_shader_in
:
8315 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
8316 per_vertex
= gl_in
->get_interface_type();
8318 case ir_var_shader_out
:
8319 if (ir_variable
*gl_Position
=
8320 state
->symbols
->get_variable("gl_Position")) {
8321 per_vertex
= gl_Position
->get_interface_type();
8325 assert(!"Unexpected mode");
8329 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
8330 * need to do anything.
8332 if (per_vertex
== NULL
)
8335 /* If the interface block is used by the shader, then we don't need to do
8338 interface_block_usage_visitor
v(mode
, per_vertex
);
8339 v
.run(instructions
);
8340 if (v
.usage_found())
8343 /* Remove any ir_variable declarations that refer to the interface block
8346 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
8347 ir_variable
*const var
= node
->as_variable();
8348 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
8349 var
->data
.mode
== mode
) {
8350 state
->symbols
->disable_variable(var
->name
);