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 "glsl_types.h"
56 #include "program/hash_table.h"
57 #include "main/shaderobj.h"
59 #include "ir_builder.h"
61 using namespace ir_builder
;
64 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
65 exec_list
*instructions
);
67 remove_per_vertex_blocks(exec_list
*instructions
,
68 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
);
72 _mesa_ast_to_hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
74 _mesa_glsl_initialize_variables(instructions
, state
);
76 state
->symbols
->separate_function_namespace
= state
->language_version
== 110;
78 state
->current_function
= NULL
;
80 state
->toplevel_ir
= instructions
;
82 state
->gs_input_prim_type_specified
= false;
83 state
->tcs_output_vertices_specified
= false;
84 state
->cs_input_local_size_specified
= false;
86 /* Section 4.2 of the GLSL 1.20 specification states:
87 * "The built-in functions are scoped in a scope outside the global scope
88 * users declare global variables in. That is, a shader's global scope,
89 * available for user-defined functions and global variables, is nested
90 * inside the scope containing the built-in functions."
92 * Since built-in functions like ftransform() access built-in variables,
93 * it follows that those must be in the outer scope as well.
95 * We push scope here to create this nesting effect...but don't pop.
96 * This way, a shader's globals are still in the symbol table for use
99 state
->symbols
->push_scope();
101 foreach_list_typed (ast_node
, ast
, link
, & state
->translation_unit
)
102 ast
->hir(instructions
, state
);
104 detect_recursion_unlinked(state
, instructions
);
105 detect_conflicting_assignments(state
, instructions
);
107 state
->toplevel_ir
= NULL
;
109 /* Move all of the variable declarations to the front of the IR list, and
110 * reverse the order. This has the (intended!) side effect that vertex
111 * shader inputs and fragment shader outputs will appear in the IR in the
112 * same order that they appeared in the shader code. This results in the
113 * locations being assigned in the declared order. Many (arguably buggy)
114 * applications depend on this behavior, and it matches what nearly all
117 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
118 ir_variable
*const var
= node
->as_variable();
124 instructions
->push_head(var
);
127 /* Figure out if gl_FragCoord is actually used in fragment shader */
128 ir_variable
*const var
= state
->symbols
->get_variable("gl_FragCoord");
130 state
->fs_uses_gl_fragcoord
= var
->data
.used
;
132 /* From section 7.1 (Built-In Language Variables) of the GLSL 4.10 spec:
134 * If multiple shaders using members of a built-in block belonging to
135 * the same interface are linked together in the same program, they
136 * must all redeclare the built-in block in the same way, as described
137 * in section 4.3.7 "Interface Blocks" for interface block matching, or
138 * a link error will result.
140 * The phrase "using members of a built-in block" implies that if two
141 * shaders are linked together and one of them *does not use* any members
142 * of the built-in block, then that shader does not need to have a matching
143 * redeclaration of the built-in block.
145 * This appears to be a clarification to the behaviour established for
146 * gl_PerVertex by GLSL 1.50, therefore implement it regardless of GLSL
149 * The definition of "interface" in section 4.3.7 that applies here is as
152 * The boundary between adjacent programmable pipeline stages: This
153 * spans all the outputs in all compilation units of the first stage
154 * and all the inputs in all compilation units of the second stage.
156 * Therefore this rule applies to both inter- and intra-stage linking.
158 * The easiest way to implement this is to check whether the shader uses
159 * gl_PerVertex right after ast-to-ir conversion, and if it doesn't, simply
160 * remove all the relevant variable declaration from the IR, so that the
161 * linker won't see them and complain about mismatches.
163 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_in
);
164 remove_per_vertex_blocks(instructions
, state
, ir_var_shader_out
);
168 static ir_expression_operation
169 get_conversion_operation(const glsl_type
*to
, const glsl_type
*from
,
170 struct _mesa_glsl_parse_state
*state
)
172 switch (to
->base_type
) {
173 case GLSL_TYPE_FLOAT
:
174 switch (from
->base_type
) {
175 case GLSL_TYPE_INT
: return ir_unop_i2f
;
176 case GLSL_TYPE_UINT
: return ir_unop_u2f
;
177 case GLSL_TYPE_DOUBLE
: return ir_unop_d2f
;
178 default: return (ir_expression_operation
)0;
182 if (!state
->is_version(400, 0) && !state
->ARB_gpu_shader5_enable
)
183 return (ir_expression_operation
)0;
184 switch (from
->base_type
) {
185 case GLSL_TYPE_INT
: return ir_unop_i2u
;
186 default: return (ir_expression_operation
)0;
189 case GLSL_TYPE_DOUBLE
:
190 if (!state
->has_double())
191 return (ir_expression_operation
)0;
192 switch (from
->base_type
) {
193 case GLSL_TYPE_INT
: return ir_unop_i2d
;
194 case GLSL_TYPE_UINT
: return ir_unop_u2d
;
195 case GLSL_TYPE_FLOAT
: return ir_unop_f2d
;
196 default: return (ir_expression_operation
)0;
199 default: return (ir_expression_operation
)0;
205 * If a conversion is available, convert one operand to a different type
207 * The \c from \c ir_rvalue is converted "in place".
209 * \param to Type that the operand it to be converted to
210 * \param from Operand that is being converted
211 * \param state GLSL compiler state
214 * If a conversion is possible (or unnecessary), \c true is returned.
215 * Otherwise \c false is returned.
218 apply_implicit_conversion(const glsl_type
*to
, ir_rvalue
* &from
,
219 struct _mesa_glsl_parse_state
*state
)
222 if (to
->base_type
== from
->type
->base_type
)
225 /* Prior to GLSL 1.20, there are no implicit conversions */
226 if (!state
->is_version(120, 0))
229 /* From page 27 (page 33 of the PDF) of the GLSL 1.50 spec:
231 * "There are no implicit array or structure conversions. For
232 * example, an array of int cannot be implicitly converted to an
235 if (!to
->is_numeric() || !from
->type
->is_numeric())
238 /* We don't actually want the specific type `to`, we want a type
239 * with the same base type as `to`, but the same vector width as
242 to
= glsl_type::get_instance(to
->base_type
, from
->type
->vector_elements
,
243 from
->type
->matrix_columns
);
245 ir_expression_operation op
= get_conversion_operation(to
, from
->type
, state
);
247 from
= new(ctx
) ir_expression(op
, to
, from
, NULL
);
255 static const struct glsl_type
*
256 arithmetic_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
258 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
260 const glsl_type
*type_a
= value_a
->type
;
261 const glsl_type
*type_b
= value_b
->type
;
263 /* From GLSL 1.50 spec, page 56:
265 * "The arithmetic binary operators add (+), subtract (-),
266 * multiply (*), and divide (/) operate on integer and
267 * floating-point scalars, vectors, and matrices."
269 if (!type_a
->is_numeric() || !type_b
->is_numeric()) {
270 _mesa_glsl_error(loc
, state
,
271 "operands to arithmetic operators must be numeric");
272 return glsl_type::error_type
;
276 /* "If one operand is floating-point based and the other is
277 * not, then the conversions from Section 4.1.10 "Implicit
278 * Conversions" are applied to the non-floating-point-based operand."
280 if (!apply_implicit_conversion(type_a
, value_b
, state
)
281 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
282 _mesa_glsl_error(loc
, state
,
283 "could not implicitly convert operands to "
284 "arithmetic operator");
285 return glsl_type::error_type
;
287 type_a
= value_a
->type
;
288 type_b
= value_b
->type
;
290 /* "If the operands are integer types, they must both be signed or
293 * From this rule and the preceeding conversion it can be inferred that
294 * both types must be GLSL_TYPE_FLOAT, or GLSL_TYPE_UINT, or GLSL_TYPE_INT.
295 * The is_numeric check above already filtered out the case where either
296 * type is not one of these, so now the base types need only be tested for
299 if (type_a
->base_type
!= type_b
->base_type
) {
300 _mesa_glsl_error(loc
, state
,
301 "base type mismatch for arithmetic operator");
302 return glsl_type::error_type
;
305 /* "All arithmetic binary operators result in the same fundamental type
306 * (signed integer, unsigned integer, or floating-point) as the
307 * operands they operate on, after operand type conversion. After
308 * conversion, the following cases are valid
310 * * The two operands are scalars. In this case the operation is
311 * applied, resulting in a scalar."
313 if (type_a
->is_scalar() && type_b
->is_scalar())
316 /* "* One operand is a scalar, and the other is a vector or matrix.
317 * In this case, the scalar operation is applied independently to each
318 * component of the vector or matrix, resulting in the same size
321 if (type_a
->is_scalar()) {
322 if (!type_b
->is_scalar())
324 } else if (type_b
->is_scalar()) {
328 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
329 * <scalar, vector>, <scalar, matrix>, and <matrix, scalar> have been
332 assert(!type_a
->is_scalar());
333 assert(!type_b
->is_scalar());
335 /* "* The two operands are vectors of the same size. In this case, the
336 * operation is done component-wise resulting in the same size
339 if (type_a
->is_vector() && type_b
->is_vector()) {
340 if (type_a
== type_b
) {
343 _mesa_glsl_error(loc
, state
,
344 "vector size mismatch for arithmetic operator");
345 return glsl_type::error_type
;
349 /* All of the combinations of <scalar, scalar>, <vector, scalar>,
350 * <scalar, vector>, <scalar, matrix>, <matrix, scalar>, and
351 * <vector, vector> have been handled. At least one of the operands must
352 * be matrix. Further, since there are no integer matrix types, the base
353 * type of both operands must be float.
355 assert(type_a
->is_matrix() || type_b
->is_matrix());
356 assert(type_a
->base_type
== GLSL_TYPE_FLOAT
||
357 type_a
->base_type
== GLSL_TYPE_DOUBLE
);
358 assert(type_b
->base_type
== GLSL_TYPE_FLOAT
||
359 type_b
->base_type
== GLSL_TYPE_DOUBLE
);
361 /* "* The operator is add (+), subtract (-), or divide (/), and the
362 * operands are matrices with the same number of rows and the same
363 * number of columns. In this case, the operation is done component-
364 * wise resulting in the same size matrix."
365 * * The operator is multiply (*), where both operands are matrices or
366 * one operand is a vector and the other a matrix. A right vector
367 * operand is treated as a column vector and a left vector operand as a
368 * row vector. In all these cases, it is required that the number of
369 * columns of the left operand is equal to the number of rows of the
370 * right operand. Then, the multiply (*) operation does a linear
371 * algebraic multiply, yielding an object that has the same number of
372 * rows as the left operand and the same number of columns as the right
373 * operand. Section 5.10 "Vector and Matrix Operations" explains in
374 * more detail how vectors and matrices are operated on."
377 if (type_a
== type_b
)
380 const glsl_type
*type
= glsl_type::get_mul_type(type_a
, type_b
);
382 if (type
== glsl_type::error_type
) {
383 _mesa_glsl_error(loc
, state
,
384 "size mismatch for matrix multiplication");
391 /* "All other cases are illegal."
393 _mesa_glsl_error(loc
, state
, "type mismatch");
394 return glsl_type::error_type
;
398 static const struct glsl_type
*
399 unary_arithmetic_result_type(const struct glsl_type
*type
,
400 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
402 /* From GLSL 1.50 spec, page 57:
404 * "The arithmetic unary operators negate (-), post- and pre-increment
405 * and decrement (-- and ++) operate on integer or floating-point
406 * values (including vectors and matrices). All unary operators work
407 * component-wise on their operands. These result with the same type
410 if (!type
->is_numeric()) {
411 _mesa_glsl_error(loc
, state
,
412 "operands to arithmetic operators must be numeric");
413 return glsl_type::error_type
;
420 * \brief Return the result type of a bit-logic operation.
422 * If the given types to the bit-logic operator are invalid, return
423 * glsl_type::error_type.
425 * \param type_a Type of LHS of bit-logic op
426 * \param type_b Type of RHS of bit-logic op
428 static const struct glsl_type
*
429 bit_logic_result_type(const struct glsl_type
*type_a
,
430 const struct glsl_type
*type_b
,
432 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
434 if (!state
->check_bitwise_operations_allowed(loc
)) {
435 return glsl_type::error_type
;
438 /* From page 50 (page 56 of PDF) of GLSL 1.30 spec:
440 * "The bitwise operators and (&), exclusive-or (^), and inclusive-or
441 * (|). The operands must be of type signed or unsigned integers or
444 if (!type_a
->is_integer()) {
445 _mesa_glsl_error(loc
, state
, "LHS of `%s' must be an integer",
446 ast_expression::operator_string(op
));
447 return glsl_type::error_type
;
449 if (!type_b
->is_integer()) {
450 _mesa_glsl_error(loc
, state
, "RHS of `%s' must be an integer",
451 ast_expression::operator_string(op
));
452 return glsl_type::error_type
;
455 /* "The fundamental types of the operands (signed or unsigned) must
458 if (type_a
->base_type
!= type_b
->base_type
) {
459 _mesa_glsl_error(loc
, state
, "operands of `%s' must have the same "
460 "base type", ast_expression::operator_string(op
));
461 return glsl_type::error_type
;
464 /* "The operands cannot be vectors of differing size." */
465 if (type_a
->is_vector() &&
466 type_b
->is_vector() &&
467 type_a
->vector_elements
!= type_b
->vector_elements
) {
468 _mesa_glsl_error(loc
, state
, "operands of `%s' cannot be vectors of "
469 "different sizes", ast_expression::operator_string(op
));
470 return glsl_type::error_type
;
473 /* "If one operand is a scalar and the other a vector, the scalar is
474 * applied component-wise to the vector, resulting in the same type as
475 * the vector. The fundamental types of the operands [...] will be the
476 * resulting fundamental type."
478 if (type_a
->is_scalar())
484 static const struct glsl_type
*
485 modulus_result_type(const struct glsl_type
*type_a
,
486 const struct glsl_type
*type_b
,
487 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
489 if (!state
->check_version(130, 300, loc
, "operator '%%' is reserved")) {
490 return glsl_type::error_type
;
493 /* From GLSL 1.50 spec, page 56:
494 * "The operator modulus (%) operates on signed or unsigned integers or
495 * integer vectors. The operand types must both be signed or both be
498 if (!type_a
->is_integer()) {
499 _mesa_glsl_error(loc
, state
, "LHS of operator %% must be an integer");
500 return glsl_type::error_type
;
502 if (!type_b
->is_integer()) {
503 _mesa_glsl_error(loc
, state
, "RHS of operator %% must be an integer");
504 return glsl_type::error_type
;
506 if (type_a
->base_type
!= type_b
->base_type
) {
507 _mesa_glsl_error(loc
, state
,
508 "operands of %% must have the same base type");
509 return glsl_type::error_type
;
512 /* "The operands cannot be vectors of differing size. If one operand is
513 * a scalar and the other vector, then the scalar is applied component-
514 * wise to the vector, resulting in the same type as the vector. If both
515 * are vectors of the same size, the result is computed component-wise."
517 if (type_a
->is_vector()) {
518 if (!type_b
->is_vector()
519 || (type_a
->vector_elements
== type_b
->vector_elements
))
524 /* "The operator modulus (%) is not defined for any other data types
525 * (non-integer types)."
527 _mesa_glsl_error(loc
, state
, "type mismatch");
528 return glsl_type::error_type
;
532 static const struct glsl_type
*
533 relational_result_type(ir_rvalue
* &value_a
, ir_rvalue
* &value_b
,
534 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
536 const glsl_type
*type_a
= value_a
->type
;
537 const glsl_type
*type_b
= value_b
->type
;
539 /* From GLSL 1.50 spec, page 56:
540 * "The relational operators greater than (>), less than (<), greater
541 * than or equal (>=), and less than or equal (<=) operate only on
542 * scalar integer and scalar floating-point expressions."
544 if (!type_a
->is_numeric()
545 || !type_b
->is_numeric()
546 || !type_a
->is_scalar()
547 || !type_b
->is_scalar()) {
548 _mesa_glsl_error(loc
, state
,
549 "operands to relational operators must be scalar and "
551 return glsl_type::error_type
;
554 /* "Either the operands' types must match, or the conversions from
555 * Section 4.1.10 "Implicit Conversions" will be applied to the integer
556 * operand, after which the types must match."
558 if (!apply_implicit_conversion(type_a
, value_b
, state
)
559 && !apply_implicit_conversion(type_b
, value_a
, state
)) {
560 _mesa_glsl_error(loc
, state
,
561 "could not implicitly convert operands to "
562 "relational operator");
563 return glsl_type::error_type
;
565 type_a
= value_a
->type
;
566 type_b
= value_b
->type
;
568 if (type_a
->base_type
!= type_b
->base_type
) {
569 _mesa_glsl_error(loc
, state
, "base type mismatch");
570 return glsl_type::error_type
;
573 /* "The result is scalar Boolean."
575 return glsl_type::bool_type
;
579 * \brief Return the result type of a bit-shift operation.
581 * If the given types to the bit-shift operator are invalid, return
582 * glsl_type::error_type.
584 * \param type_a Type of LHS of bit-shift op
585 * \param type_b Type of RHS of bit-shift op
587 static const struct glsl_type
*
588 shift_result_type(const struct glsl_type
*type_a
,
589 const struct glsl_type
*type_b
,
591 struct _mesa_glsl_parse_state
*state
, YYLTYPE
*loc
)
593 if (!state
->check_bitwise_operations_allowed(loc
)) {
594 return glsl_type::error_type
;
597 /* From page 50 (page 56 of the PDF) of the GLSL 1.30 spec:
599 * "The shift operators (<<) and (>>). For both operators, the operands
600 * must be signed or unsigned integers or integer vectors. One operand
601 * can be signed while the other is unsigned."
603 if (!type_a
->is_integer()) {
604 _mesa_glsl_error(loc
, state
, "LHS of operator %s must be an integer or "
605 "integer vector", ast_expression::operator_string(op
));
606 return glsl_type::error_type
;
609 if (!type_b
->is_integer()) {
610 _mesa_glsl_error(loc
, state
, "RHS of operator %s must be an integer or "
611 "integer vector", ast_expression::operator_string(op
));
612 return glsl_type::error_type
;
615 /* "If the first operand is a scalar, the second operand has to be
618 if (type_a
->is_scalar() && !type_b
->is_scalar()) {
619 _mesa_glsl_error(loc
, state
, "if the first operand of %s is scalar, the "
620 "second must be scalar as well",
621 ast_expression::operator_string(op
));
622 return glsl_type::error_type
;
625 /* If both operands are vectors, check that they have same number of
628 if (type_a
->is_vector() &&
629 type_b
->is_vector() &&
630 type_a
->vector_elements
!= type_b
->vector_elements
) {
631 _mesa_glsl_error(loc
, state
, "vector operands to operator %s must "
632 "have same number of elements",
633 ast_expression::operator_string(op
));
634 return glsl_type::error_type
;
637 /* "In all cases, the resulting type will be the same type as the left
644 * Returns the innermost array index expression in an rvalue tree.
645 * This is the largest indexing level -- if an array of blocks, then
646 * it is the block index rather than an indexing expression for an
647 * array-typed member of an array of blocks.
650 find_innermost_array_index(ir_rvalue
*rv
)
652 ir_dereference_array
*last
= NULL
;
654 if (rv
->as_dereference_array()) {
655 last
= rv
->as_dereference_array();
657 } else if (rv
->as_dereference_record())
658 rv
= rv
->as_dereference_record()->record
;
659 else if (rv
->as_swizzle())
660 rv
= rv
->as_swizzle()->val
;
666 return last
->array_index
;
672 * Validates that a value can be assigned to a location with a specified type
674 * Validates that \c rhs can be assigned to some location. If the types are
675 * not an exact match but an automatic conversion is possible, \c rhs will be
679 * \c NULL if \c rhs cannot be assigned to a location with type \c lhs_type.
680 * Otherwise the actual RHS to be assigned will be returned. This may be
681 * \c rhs, or it may be \c rhs after some type conversion.
684 * In addition to being used for assignments, this function is used to
685 * type-check return values.
688 validate_assignment(struct _mesa_glsl_parse_state
*state
,
689 YYLTYPE loc
, ir_rvalue
*lhs
,
690 ir_rvalue
*rhs
, bool is_initializer
)
692 /* If there is already some error in the RHS, just return it. Anything
693 * else will lead to an avalanche of error message back to the user.
695 if (rhs
->type
->is_error())
698 /* In the Tessellation Control Shader:
699 * If a per-vertex output variable is used as an l-value, it is an error
700 * if the expression indicating the vertex number is not the identifier
703 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
704 ir_variable
*var
= lhs
->variable_referenced();
705 if (var
->data
.mode
== ir_var_shader_out
&& !var
->data
.patch
) {
706 ir_rvalue
*index
= find_innermost_array_index(lhs
);
707 ir_variable
*index_var
= index
? index
->variable_referenced() : NULL
;
708 if (!index_var
|| strcmp(index_var
->name
, "gl_InvocationID") != 0) {
709 _mesa_glsl_error(&loc
, state
,
710 "Tessellation control shader outputs can only "
711 "be indexed by gl_InvocationID");
717 /* If the types are identical, the assignment can trivially proceed.
719 if (rhs
->type
== lhs
->type
)
722 /* If the array element types are the same and the LHS is unsized,
723 * the assignment is okay for initializers embedded in variable
726 * Note: Whole-array assignments are not permitted in GLSL 1.10, but this
727 * is handled by ir_dereference::is_lvalue.
729 if (lhs
->type
->is_unsized_array() && rhs
->type
->is_array()
730 && (lhs
->type
->fields
.array
== rhs
->type
->fields
.array
)) {
731 if (is_initializer
) {
734 _mesa_glsl_error(&loc
, state
,
735 "implicitly sized arrays cannot be assigned");
740 /* Check for implicit conversion in GLSL 1.20 */
741 if (apply_implicit_conversion(lhs
->type
, rhs
, state
)) {
742 if (rhs
->type
== lhs
->type
)
746 _mesa_glsl_error(&loc
, state
,
747 "%s of type %s cannot be assigned to "
748 "variable of type %s",
749 is_initializer
? "initializer" : "value",
750 rhs
->type
->name
, lhs
->type
->name
);
756 mark_whole_array_access(ir_rvalue
*access
)
758 ir_dereference_variable
*deref
= access
->as_dereference_variable();
760 if (deref
&& deref
->var
) {
761 deref
->var
->data
.max_array_access
= deref
->type
->length
- 1;
766 do_assignment(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
,
767 const char *non_lvalue_description
,
768 ir_rvalue
*lhs
, ir_rvalue
*rhs
,
769 ir_rvalue
**out_rvalue
, bool needs_rvalue
,
774 bool error_emitted
= (lhs
->type
->is_error() || rhs
->type
->is_error());
775 ir_rvalue
*extract_channel
= NULL
;
777 /* If the assignment LHS comes back as an ir_binop_vector_extract
778 * expression, move it to the RHS as an ir_triop_vector_insert.
780 if (lhs
->ir_type
== ir_type_expression
) {
781 ir_expression
*const lhs_expr
= lhs
->as_expression();
783 if (unlikely(lhs_expr
->operation
== ir_binop_vector_extract
)) {
785 validate_assignment(state
, lhs_loc
, lhs
,
786 rhs
, is_initializer
);
788 if (new_rhs
== NULL
) {
792 * - LHS: (expression float vector_extract <vec> <channel>)
796 * - RHS: (expression vec2 vector_insert <vec> <channel> <scalar>)
798 * The LHS type is now a vector instead of a scalar. Since GLSL
799 * allows assignments to be used as rvalues, we need to re-extract
800 * the channel from assignment_temp when returning the rvalue.
802 extract_channel
= lhs_expr
->operands
[1];
803 rhs
= new(ctx
) ir_expression(ir_triop_vector_insert
,
804 lhs_expr
->operands
[0]->type
,
805 lhs_expr
->operands
[0],
808 lhs
= lhs_expr
->operands
[0]->clone(ctx
, NULL
);
813 ir_variable
*lhs_var
= lhs
->variable_referenced();
815 lhs_var
->data
.assigned
= true;
817 if (!error_emitted
) {
818 if (non_lvalue_description
!= NULL
) {
819 _mesa_glsl_error(&lhs_loc
, state
,
821 non_lvalue_description
);
822 error_emitted
= true;
823 } else if (lhs_var
!= NULL
&& lhs_var
->data
.read_only
) {
824 _mesa_glsl_error(&lhs_loc
, state
,
825 "assignment to read-only variable '%s'",
827 error_emitted
= true;
828 } else if (lhs
->type
->is_array() &&
829 !state
->check_version(120, 300, &lhs_loc
,
830 "whole array assignment forbidden")) {
831 /* From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
833 * "Other binary or unary expressions, non-dereferenced
834 * arrays, function names, swizzles with repeated fields,
835 * and constants cannot be l-values."
837 * The restriction on arrays is lifted in GLSL 1.20 and GLSL ES 3.00.
839 error_emitted
= true;
840 } else if (!lhs
->is_lvalue()) {
841 _mesa_glsl_error(& lhs_loc
, state
, "non-lvalue in assignment");
842 error_emitted
= true;
847 validate_assignment(state
, lhs_loc
, lhs
, rhs
, is_initializer
);
848 if (new_rhs
!= NULL
) {
851 /* If the LHS array was not declared with a size, it takes it size from
852 * the RHS. If the LHS is an l-value and a whole array, it must be a
853 * dereference of a variable. Any other case would require that the LHS
854 * is either not an l-value or not a whole array.
856 if (lhs
->type
->is_unsized_array()) {
857 ir_dereference
*const d
= lhs
->as_dereference();
861 ir_variable
*const var
= d
->variable_referenced();
865 if (var
->data
.max_array_access
>= unsigned(rhs
->type
->array_size())) {
866 /* FINISHME: This should actually log the location of the RHS. */
867 _mesa_glsl_error(& lhs_loc
, state
, "array size must be > %u due to "
869 var
->data
.max_array_access
);
872 var
->type
= glsl_type::get_array_instance(lhs
->type
->fields
.array
,
873 rhs
->type
->array_size());
876 if (lhs
->type
->is_array()) {
877 mark_whole_array_access(rhs
);
878 mark_whole_array_access(lhs
);
882 /* Most callers of do_assignment (assign, add_assign, pre_inc/dec,
883 * but not post_inc) need the converted assigned value as an rvalue
884 * to handle things like:
889 ir_variable
*var
= new(ctx
) ir_variable(rhs
->type
, "assignment_tmp",
891 instructions
->push_tail(var
);
892 instructions
->push_tail(assign(var
, rhs
));
894 if (!error_emitted
) {
895 ir_dereference_variable
*deref_var
= new(ctx
) ir_dereference_variable(var
);
896 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, deref_var
));
898 ir_rvalue
*rvalue
= new(ctx
) ir_dereference_variable(var
);
900 if (extract_channel
) {
901 rvalue
= new(ctx
) ir_expression(ir_binop_vector_extract
,
903 extract_channel
->clone(ctx
, NULL
));
906 *out_rvalue
= rvalue
;
909 instructions
->push_tail(new(ctx
) ir_assignment(lhs
, rhs
));
913 return error_emitted
;
917 get_lvalue_copy(exec_list
*instructions
, ir_rvalue
*lvalue
)
919 void *ctx
= ralloc_parent(lvalue
);
922 var
= new(ctx
) ir_variable(lvalue
->type
, "_post_incdec_tmp",
924 instructions
->push_tail(var
);
926 instructions
->push_tail(new(ctx
) ir_assignment(new(ctx
) ir_dereference_variable(var
),
929 return new(ctx
) ir_dereference_variable(var
);
934 ast_node::hir(exec_list
*instructions
, struct _mesa_glsl_parse_state
*state
)
943 ast_function_expression::hir_no_rvalue(exec_list
*instructions
,
944 struct _mesa_glsl_parse_state
*state
)
946 (void)hir(instructions
, state
);
950 ast_aggregate_initializer::hir_no_rvalue(exec_list
*instructions
,
951 struct _mesa_glsl_parse_state
*state
)
953 (void)hir(instructions
, state
);
957 do_comparison(void *mem_ctx
, int operation
, ir_rvalue
*op0
, ir_rvalue
*op1
)
960 ir_rvalue
*cmp
= NULL
;
962 if (operation
== ir_binop_all_equal
)
963 join_op
= ir_binop_logic_and
;
965 join_op
= ir_binop_logic_or
;
967 switch (op0
->type
->base_type
) {
968 case GLSL_TYPE_FLOAT
:
972 case GLSL_TYPE_DOUBLE
:
973 return new(mem_ctx
) ir_expression(operation
, op0
, op1
);
975 case GLSL_TYPE_ARRAY
: {
976 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
977 ir_rvalue
*e0
, *e1
, *result
;
979 e0
= new(mem_ctx
) ir_dereference_array(op0
->clone(mem_ctx
, NULL
),
980 new(mem_ctx
) ir_constant(i
));
981 e1
= new(mem_ctx
) ir_dereference_array(op1
->clone(mem_ctx
, NULL
),
982 new(mem_ctx
) ir_constant(i
));
983 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
986 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
992 mark_whole_array_access(op0
);
993 mark_whole_array_access(op1
);
997 case GLSL_TYPE_STRUCT
: {
998 for (unsigned int i
= 0; i
< op0
->type
->length
; i
++) {
999 ir_rvalue
*e0
, *e1
, *result
;
1000 const char *field_name
= op0
->type
->fields
.structure
[i
].name
;
1002 e0
= new(mem_ctx
) ir_dereference_record(op0
->clone(mem_ctx
, NULL
),
1004 e1
= new(mem_ctx
) ir_dereference_record(op1
->clone(mem_ctx
, NULL
),
1006 result
= do_comparison(mem_ctx
, operation
, e0
, e1
);
1009 cmp
= new(mem_ctx
) ir_expression(join_op
, cmp
, result
);
1017 case GLSL_TYPE_ERROR
:
1018 case GLSL_TYPE_VOID
:
1019 case GLSL_TYPE_SAMPLER
:
1020 case GLSL_TYPE_IMAGE
:
1021 case GLSL_TYPE_INTERFACE
:
1022 case GLSL_TYPE_FUNCTION
:
1023 case GLSL_TYPE_ATOMIC_UINT
:
1024 case GLSL_TYPE_SUBROUTINE
:
1025 /* I assume a comparison of a struct containing a sampler just
1026 * ignores the sampler present in the type.
1032 cmp
= new(mem_ctx
) ir_constant(true);
1037 /* For logical operations, we want to ensure that the operands are
1038 * scalar booleans. If it isn't, emit an error and return a constant
1039 * boolean to avoid triggering cascading error messages.
1042 get_scalar_boolean_operand(exec_list
*instructions
,
1043 struct _mesa_glsl_parse_state
*state
,
1044 ast_expression
*parent_expr
,
1046 const char *operand_name
,
1047 bool *error_emitted
)
1049 ast_expression
*expr
= parent_expr
->subexpressions
[operand
];
1051 ir_rvalue
*val
= expr
->hir(instructions
, state
);
1053 if (val
->type
->is_boolean() && val
->type
->is_scalar())
1056 if (!*error_emitted
) {
1057 YYLTYPE loc
= expr
->get_location();
1058 _mesa_glsl_error(&loc
, state
, "%s of `%s' must be scalar boolean",
1060 parent_expr
->operator_string(parent_expr
->oper
));
1061 *error_emitted
= true;
1064 return new(ctx
) ir_constant(true);
1068 * If name refers to a builtin array whose maximum allowed size is less than
1069 * size, report an error and return true. Otherwise return false.
1072 check_builtin_array_max_size(const char *name
, unsigned size
,
1073 YYLTYPE loc
, struct _mesa_glsl_parse_state
*state
)
1075 if ((strcmp("gl_TexCoord", name
) == 0)
1076 && (size
> state
->Const
.MaxTextureCoords
)) {
1077 /* From page 54 (page 60 of the PDF) of the GLSL 1.20 spec:
1079 * "The size [of gl_TexCoord] can be at most
1080 * gl_MaxTextureCoords."
1082 _mesa_glsl_error(&loc
, state
, "`gl_TexCoord' array size cannot "
1083 "be larger than gl_MaxTextureCoords (%u)",
1084 state
->Const
.MaxTextureCoords
);
1085 } else if (strcmp("gl_ClipDistance", name
) == 0
1086 && size
> state
->Const
.MaxClipPlanes
) {
1087 /* From section 7.1 (Vertex Shader Special Variables) of the
1090 * "The gl_ClipDistance array is predeclared as unsized and
1091 * must be sized by the shader either redeclaring it with a
1092 * size or indexing it only with integral constant
1093 * expressions. ... The size can be at most
1094 * gl_MaxClipDistances."
1096 _mesa_glsl_error(&loc
, state
, "`gl_ClipDistance' array size cannot "
1097 "be larger than gl_MaxClipDistances (%u)",
1098 state
->Const
.MaxClipPlanes
);
1103 * Create the constant 1, of a which is appropriate for incrementing and
1104 * decrementing values of the given GLSL type. For example, if type is vec4,
1105 * this creates a constant value of 1.0 having type float.
1107 * If the given type is invalid for increment and decrement operators, return
1108 * a floating point 1--the error will be detected later.
1111 constant_one_for_inc_dec(void *ctx
, const glsl_type
*type
)
1113 switch (type
->base_type
) {
1114 case GLSL_TYPE_UINT
:
1115 return new(ctx
) ir_constant((unsigned) 1);
1117 return new(ctx
) ir_constant(1);
1119 case GLSL_TYPE_FLOAT
:
1120 return new(ctx
) ir_constant(1.0f
);
1125 ast_expression::hir(exec_list
*instructions
,
1126 struct _mesa_glsl_parse_state
*state
)
1128 return do_hir(instructions
, state
, true);
1132 ast_expression::hir_no_rvalue(exec_list
*instructions
,
1133 struct _mesa_glsl_parse_state
*state
)
1135 do_hir(instructions
, state
, false);
1139 ast_expression::do_hir(exec_list
*instructions
,
1140 struct _mesa_glsl_parse_state
*state
,
1144 static const int operations
[AST_NUM_OPERATORS
] = {
1145 -1, /* ast_assign doesn't convert to ir_expression. */
1146 -1, /* ast_plus doesn't convert to ir_expression. */
1160 ir_binop_any_nequal
,
1170 /* Note: The following block of expression types actually convert
1171 * to multiple IR instructions.
1173 ir_binop_mul
, /* ast_mul_assign */
1174 ir_binop_div
, /* ast_div_assign */
1175 ir_binop_mod
, /* ast_mod_assign */
1176 ir_binop_add
, /* ast_add_assign */
1177 ir_binop_sub
, /* ast_sub_assign */
1178 ir_binop_lshift
, /* ast_ls_assign */
1179 ir_binop_rshift
, /* ast_rs_assign */
1180 ir_binop_bit_and
, /* ast_and_assign */
1181 ir_binop_bit_xor
, /* ast_xor_assign */
1182 ir_binop_bit_or
, /* ast_or_assign */
1184 -1, /* ast_conditional doesn't convert to ir_expression. */
1185 ir_binop_add
, /* ast_pre_inc. */
1186 ir_binop_sub
, /* ast_pre_dec. */
1187 ir_binop_add
, /* ast_post_inc. */
1188 ir_binop_sub
, /* ast_post_dec. */
1189 -1, /* ast_field_selection doesn't conv to ir_expression. */
1190 -1, /* ast_array_index doesn't convert to ir_expression. */
1191 -1, /* ast_function_call doesn't conv to ir_expression. */
1192 -1, /* ast_identifier doesn't convert to ir_expression. */
1193 -1, /* ast_int_constant doesn't convert to ir_expression. */
1194 -1, /* ast_uint_constant doesn't conv to ir_expression. */
1195 -1, /* ast_float_constant doesn't conv to ir_expression. */
1196 -1, /* ast_bool_constant doesn't conv to ir_expression. */
1197 -1, /* ast_sequence doesn't convert to ir_expression. */
1199 ir_rvalue
*result
= NULL
;
1201 const struct glsl_type
*type
; /* a temporary variable for switch cases */
1202 bool error_emitted
= false;
1205 loc
= this->get_location();
1207 switch (this->oper
) {
1209 assert(!"ast_aggregate: Should never get here.");
1213 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1214 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1217 do_assignment(instructions
, state
,
1218 this->subexpressions
[0]->non_lvalue_description
,
1219 op
[0], op
[1], &result
, needs_rvalue
, false,
1220 this->subexpressions
[0]->get_location());
1225 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1227 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1229 error_emitted
= type
->is_error();
1235 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1237 type
= unary_arithmetic_result_type(op
[0]->type
, state
, & loc
);
1239 error_emitted
= type
->is_error();
1241 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1249 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1250 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1252 type
= arithmetic_result_type(op
[0], op
[1],
1253 (this->oper
== ast_mul
),
1255 error_emitted
= type
->is_error();
1257 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1262 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1263 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1265 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1267 assert(operations
[this->oper
] == ir_binop_mod
);
1269 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1271 error_emitted
= type
->is_error();
1276 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1277 error_emitted
= true;
1280 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1281 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1282 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1284 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1286 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1293 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1294 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1296 type
= relational_result_type(op
[0], op
[1], state
, & loc
);
1298 /* The relational operators must either generate an error or result
1299 * in a scalar boolean. See page 57 of the GLSL 1.50 spec.
1301 assert(type
->is_error()
1302 || ((type
->base_type
== GLSL_TYPE_BOOL
)
1303 && type
->is_scalar()));
1305 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1307 error_emitted
= type
->is_error();
1312 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1313 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1315 /* From page 58 (page 64 of the PDF) of the GLSL 1.50 spec:
1317 * "The equality operators equal (==), and not equal (!=)
1318 * operate on all types. They result in a scalar Boolean. If
1319 * the operand types do not match, then there must be a
1320 * conversion from Section 4.1.10 "Implicit Conversions"
1321 * applied to one operand that can make them match, in which
1322 * case this conversion is done."
1325 if (op
[0]->type
== glsl_type::void_type
|| op
[1]->type
== glsl_type::void_type
) {
1326 _mesa_glsl_error(& loc
, state
, "`%s': wrong operand types: "
1327 "no operation `%1$s' exists that takes a left-hand "
1328 "operand of type 'void' or a right operand of type "
1329 "'void'", (this->oper
== ast_equal
) ? "==" : "!=");
1330 error_emitted
= true;
1331 } else if ((!apply_implicit_conversion(op
[0]->type
, op
[1], state
)
1332 && !apply_implicit_conversion(op
[1]->type
, op
[0], state
))
1333 || (op
[0]->type
!= op
[1]->type
)) {
1334 _mesa_glsl_error(& loc
, state
, "operands of `%s' must have the same "
1335 "type", (this->oper
== ast_equal
) ? "==" : "!=");
1336 error_emitted
= true;
1337 } else if ((op
[0]->type
->is_array() || op
[1]->type
->is_array()) &&
1338 !state
->check_version(120, 300, &loc
,
1339 "array comparisons forbidden")) {
1340 error_emitted
= true;
1341 } else if ((op
[0]->type
->contains_opaque() ||
1342 op
[1]->type
->contains_opaque())) {
1343 _mesa_glsl_error(&loc
, state
, "opaque type comparisons forbidden");
1344 error_emitted
= true;
1347 if (error_emitted
) {
1348 result
= new(ctx
) ir_constant(false);
1350 result
= do_comparison(ctx
, operations
[this->oper
], op
[0], op
[1]);
1351 assert(result
->type
== glsl_type::bool_type
);
1358 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1359 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1360 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1362 result
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1364 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1368 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1370 if (!state
->check_bitwise_operations_allowed(&loc
)) {
1371 error_emitted
= true;
1374 if (!op
[0]->type
->is_integer()) {
1375 _mesa_glsl_error(&loc
, state
, "operand of `~' must be an integer");
1376 error_emitted
= true;
1379 type
= error_emitted
? glsl_type::error_type
: op
[0]->type
;
1380 result
= new(ctx
) ir_expression(ir_unop_bit_not
, type
, op
[0], NULL
);
1383 case ast_logic_and
: {
1384 exec_list rhs_instructions
;
1385 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1386 "LHS", &error_emitted
);
1387 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1388 "RHS", &error_emitted
);
1390 if (rhs_instructions
.is_empty()) {
1391 result
= new(ctx
) ir_expression(ir_binop_logic_and
, op
[0], op
[1]);
1392 type
= result
->type
;
1394 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1397 instructions
->push_tail(tmp
);
1399 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1400 instructions
->push_tail(stmt
);
1402 stmt
->then_instructions
.append_list(&rhs_instructions
);
1403 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1404 ir_assignment
*const then_assign
=
1405 new(ctx
) ir_assignment(then_deref
, op
[1]);
1406 stmt
->then_instructions
.push_tail(then_assign
);
1408 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1409 ir_assignment
*const else_assign
=
1410 new(ctx
) ir_assignment(else_deref
, new(ctx
) ir_constant(false));
1411 stmt
->else_instructions
.push_tail(else_assign
);
1413 result
= new(ctx
) ir_dereference_variable(tmp
);
1419 case ast_logic_or
: {
1420 exec_list rhs_instructions
;
1421 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1422 "LHS", &error_emitted
);
1423 op
[1] = get_scalar_boolean_operand(&rhs_instructions
, state
, this, 1,
1424 "RHS", &error_emitted
);
1426 if (rhs_instructions
.is_empty()) {
1427 result
= new(ctx
) ir_expression(ir_binop_logic_or
, op
[0], op
[1]);
1428 type
= result
->type
;
1430 ir_variable
*const tmp
= new(ctx
) ir_variable(glsl_type::bool_type
,
1433 instructions
->push_tail(tmp
);
1435 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1436 instructions
->push_tail(stmt
);
1438 ir_dereference
*const then_deref
= new(ctx
) ir_dereference_variable(tmp
);
1439 ir_assignment
*const then_assign
=
1440 new(ctx
) ir_assignment(then_deref
, new(ctx
) ir_constant(true));
1441 stmt
->then_instructions
.push_tail(then_assign
);
1443 stmt
->else_instructions
.append_list(&rhs_instructions
);
1444 ir_dereference
*const else_deref
= new(ctx
) ir_dereference_variable(tmp
);
1445 ir_assignment
*const else_assign
=
1446 new(ctx
) ir_assignment(else_deref
, op
[1]);
1447 stmt
->else_instructions
.push_tail(else_assign
);
1449 result
= new(ctx
) ir_dereference_variable(tmp
);
1456 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1458 * "The logical binary operators and (&&), or ( | | ), and
1459 * exclusive or (^^). They operate only on two Boolean
1460 * expressions and result in a Boolean expression."
1462 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0, "LHS",
1464 op
[1] = get_scalar_boolean_operand(instructions
, state
, this, 1, "RHS",
1467 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1472 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1473 "operand", &error_emitted
);
1475 result
= new(ctx
) ir_expression(operations
[this->oper
], glsl_type::bool_type
,
1479 case ast_mul_assign
:
1480 case ast_div_assign
:
1481 case ast_add_assign
:
1482 case ast_sub_assign
: {
1483 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1484 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1486 type
= arithmetic_result_type(op
[0], op
[1],
1487 (this->oper
== ast_mul_assign
),
1490 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1494 do_assignment(instructions
, state
,
1495 this->subexpressions
[0]->non_lvalue_description
,
1496 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1497 &result
, needs_rvalue
, false,
1498 this->subexpressions
[0]->get_location());
1500 /* GLSL 1.10 does not allow array assignment. However, we don't have to
1501 * explicitly test for this because none of the binary expression
1502 * operators allow array operands either.
1508 case ast_mod_assign
: {
1509 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1510 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1512 type
= modulus_result_type(op
[0]->type
, op
[1]->type
, state
, & loc
);
1514 assert(operations
[this->oper
] == ir_binop_mod
);
1516 ir_rvalue
*temp_rhs
;
1517 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1521 do_assignment(instructions
, state
,
1522 this->subexpressions
[0]->non_lvalue_description
,
1523 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1524 &result
, needs_rvalue
, false,
1525 this->subexpressions
[0]->get_location());
1530 case ast_rs_assign
: {
1531 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1532 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1533 type
= shift_result_type(op
[0]->type
, op
[1]->type
, this->oper
, state
,
1535 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1536 type
, op
[0], op
[1]);
1538 do_assignment(instructions
, state
,
1539 this->subexpressions
[0]->non_lvalue_description
,
1540 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1541 &result
, needs_rvalue
, false,
1542 this->subexpressions
[0]->get_location());
1546 case ast_and_assign
:
1547 case ast_xor_assign
:
1548 case ast_or_assign
: {
1549 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1550 op
[1] = this->subexpressions
[1]->hir(instructions
, state
);
1551 type
= bit_logic_result_type(op
[0]->type
, op
[1]->type
, this->oper
,
1553 ir_rvalue
*temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
],
1554 type
, op
[0], op
[1]);
1556 do_assignment(instructions
, state
,
1557 this->subexpressions
[0]->non_lvalue_description
,
1558 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1559 &result
, needs_rvalue
, false,
1560 this->subexpressions
[0]->get_location());
1564 case ast_conditional
: {
1565 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1567 * "The ternary selection operator (?:). It operates on three
1568 * expressions (exp1 ? exp2 : exp3). This operator evaluates the
1569 * first expression, which must result in a scalar Boolean."
1571 op
[0] = get_scalar_boolean_operand(instructions
, state
, this, 0,
1572 "condition", &error_emitted
);
1574 /* The :? operator is implemented by generating an anonymous temporary
1575 * followed by an if-statement. The last instruction in each branch of
1576 * the if-statement assigns a value to the anonymous temporary. This
1577 * temporary is the r-value of the expression.
1579 exec_list then_instructions
;
1580 exec_list else_instructions
;
1582 op
[1] = this->subexpressions
[1]->hir(&then_instructions
, state
);
1583 op
[2] = this->subexpressions
[2]->hir(&else_instructions
, state
);
1585 /* From page 59 (page 65 of the PDF) of the GLSL 1.50 spec:
1587 * "The second and third expressions can be any type, as
1588 * long their types match, or there is a conversion in
1589 * Section 4.1.10 "Implicit Conversions" that can be applied
1590 * to one of the expressions to make their types match. This
1591 * resulting matching type is the type of the entire
1594 if ((!apply_implicit_conversion(op
[1]->type
, op
[2], state
)
1595 && !apply_implicit_conversion(op
[2]->type
, op
[1], state
))
1596 || (op
[1]->type
!= op
[2]->type
)) {
1597 YYLTYPE loc
= this->subexpressions
[1]->get_location();
1599 _mesa_glsl_error(& loc
, state
, "second and third operands of ?: "
1600 "operator must have matching types");
1601 error_emitted
= true;
1602 type
= glsl_type::error_type
;
1607 /* From page 33 (page 39 of the PDF) of the GLSL 1.10 spec:
1609 * "The second and third expressions must be the same type, but can
1610 * be of any type other than an array."
1612 if (type
->is_array() &&
1613 !state
->check_version(120, 300, &loc
,
1614 "second and third operands of ?: operator "
1615 "cannot be arrays")) {
1616 error_emitted
= true;
1619 /* From section 4.1.7 of the GLSL 4.50 spec (Opaque Types):
1621 * "Except for array indexing, structure member selection, and
1622 * parentheses, opaque variables are not allowed to be operands in
1623 * expressions; such use results in a compile-time error."
1625 if (type
->contains_opaque()) {
1626 _mesa_glsl_error(&loc
, state
, "opaque variables cannot be operands "
1627 "of the ?: operator");
1628 error_emitted
= true;
1631 ir_constant
*cond_val
= op
[0]->constant_expression_value();
1633 if (then_instructions
.is_empty()
1634 && else_instructions
.is_empty()
1635 && cond_val
!= NULL
) {
1636 result
= cond_val
->value
.b
[0] ? op
[1] : op
[2];
1638 /* The copy to conditional_tmp reads the whole array. */
1639 if (type
->is_array()) {
1640 mark_whole_array_access(op
[1]);
1641 mark_whole_array_access(op
[2]);
1644 ir_variable
*const tmp
=
1645 new(ctx
) ir_variable(type
, "conditional_tmp", ir_var_temporary
);
1646 instructions
->push_tail(tmp
);
1648 ir_if
*const stmt
= new(ctx
) ir_if(op
[0]);
1649 instructions
->push_tail(stmt
);
1651 then_instructions
.move_nodes_to(& stmt
->then_instructions
);
1652 ir_dereference
*const then_deref
=
1653 new(ctx
) ir_dereference_variable(tmp
);
1654 ir_assignment
*const then_assign
=
1655 new(ctx
) ir_assignment(then_deref
, op
[1]);
1656 stmt
->then_instructions
.push_tail(then_assign
);
1658 else_instructions
.move_nodes_to(& stmt
->else_instructions
);
1659 ir_dereference
*const else_deref
=
1660 new(ctx
) ir_dereference_variable(tmp
);
1661 ir_assignment
*const else_assign
=
1662 new(ctx
) ir_assignment(else_deref
, op
[2]);
1663 stmt
->else_instructions
.push_tail(else_assign
);
1665 result
= new(ctx
) ir_dereference_variable(tmp
);
1672 this->non_lvalue_description
= (this->oper
== ast_pre_inc
)
1673 ? "pre-increment operation" : "pre-decrement operation";
1675 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1676 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1678 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1680 ir_rvalue
*temp_rhs
;
1681 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1685 do_assignment(instructions
, state
,
1686 this->subexpressions
[0]->non_lvalue_description
,
1687 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1688 &result
, needs_rvalue
, false,
1689 this->subexpressions
[0]->get_location());
1694 case ast_post_dec
: {
1695 this->non_lvalue_description
= (this->oper
== ast_post_inc
)
1696 ? "post-increment operation" : "post-decrement operation";
1697 op
[0] = this->subexpressions
[0]->hir(instructions
, state
);
1698 op
[1] = constant_one_for_inc_dec(ctx
, op
[0]->type
);
1700 error_emitted
= op
[0]->type
->is_error() || op
[1]->type
->is_error();
1702 type
= arithmetic_result_type(op
[0], op
[1], false, state
, & loc
);
1704 ir_rvalue
*temp_rhs
;
1705 temp_rhs
= new(ctx
) ir_expression(operations
[this->oper
], type
,
1708 /* Get a temporary of a copy of the lvalue before it's modified.
1709 * This may get thrown away later.
1711 result
= get_lvalue_copy(instructions
, op
[0]->clone(ctx
, NULL
));
1713 ir_rvalue
*junk_rvalue
;
1715 do_assignment(instructions
, state
,
1716 this->subexpressions
[0]->non_lvalue_description
,
1717 op
[0]->clone(ctx
, NULL
), temp_rhs
,
1718 &junk_rvalue
, false, false,
1719 this->subexpressions
[0]->get_location());
1724 case ast_field_selection
:
1725 result
= _mesa_ast_field_selection_to_hir(this, instructions
, state
);
1728 case ast_array_index
: {
1729 YYLTYPE index_loc
= subexpressions
[1]->get_location();
1731 op
[0] = subexpressions
[0]->hir(instructions
, state
);
1732 op
[1] = subexpressions
[1]->hir(instructions
, state
);
1734 result
= _mesa_ast_array_index_to_hir(ctx
, state
, op
[0], op
[1],
1737 if (result
->type
->is_error())
1738 error_emitted
= true;
1743 case ast_function_call
:
1744 /* Should *NEVER* get here. ast_function_call should always be handled
1745 * by ast_function_expression::hir.
1750 case ast_identifier
: {
1751 /* ast_identifier can appear several places in a full abstract syntax
1752 * tree. This particular use must be at location specified in the grammar
1753 * as 'variable_identifier'.
1756 state
->symbols
->get_variable(this->primary_expression
.identifier
);
1759 var
->data
.used
= true;
1760 result
= new(ctx
) ir_dereference_variable(var
);
1762 _mesa_glsl_error(& loc
, state
, "`%s' undeclared",
1763 this->primary_expression
.identifier
);
1765 result
= ir_rvalue::error_value(ctx
);
1766 error_emitted
= true;
1771 case ast_int_constant
:
1772 result
= new(ctx
) ir_constant(this->primary_expression
.int_constant
);
1775 case ast_uint_constant
:
1776 result
= new(ctx
) ir_constant(this->primary_expression
.uint_constant
);
1779 case ast_float_constant
:
1780 result
= new(ctx
) ir_constant(this->primary_expression
.float_constant
);
1783 case ast_bool_constant
:
1784 result
= new(ctx
) ir_constant(bool(this->primary_expression
.bool_constant
));
1787 case ast_double_constant
:
1788 result
= new(ctx
) ir_constant(this->primary_expression
.double_constant
);
1791 case ast_sequence
: {
1792 /* It should not be possible to generate a sequence in the AST without
1793 * any expressions in it.
1795 assert(!this->expressions
.is_empty());
1797 /* The r-value of a sequence is the last expression in the sequence. If
1798 * the other expressions in the sequence do not have side-effects (and
1799 * therefore add instructions to the instruction list), they get dropped
1802 exec_node
*previous_tail_pred
= NULL
;
1803 YYLTYPE previous_operand_loc
= loc
;
1805 foreach_list_typed (ast_node
, ast
, link
, &this->expressions
) {
1806 /* If one of the operands of comma operator does not generate any
1807 * code, we want to emit a warning. At each pass through the loop
1808 * previous_tail_pred will point to the last instruction in the
1809 * stream *before* processing the previous operand. Naturally,
1810 * instructions->tail_pred will point to the last instruction in the
1811 * stream *after* processing the previous operand. If the two
1812 * pointers match, then the previous operand had no effect.
1814 * The warning behavior here differs slightly from GCC. GCC will
1815 * only emit a warning if none of the left-hand operands have an
1816 * effect. However, it will emit a warning for each. I believe that
1817 * there are some cases in C (especially with GCC extensions) where
1818 * it is useful to have an intermediate step in a sequence have no
1819 * effect, but I don't think these cases exist in GLSL. Either way,
1820 * it would be a giant hassle to replicate that behavior.
1822 if (previous_tail_pred
== instructions
->tail_pred
) {
1823 _mesa_glsl_warning(&previous_operand_loc
, state
,
1824 "left-hand operand of comma expression has "
1828 /* tail_pred is directly accessed instead of using the get_tail()
1829 * method for performance reasons. get_tail() has extra code to
1830 * return NULL when the list is empty. We don't care about that
1831 * here, so using tail_pred directly is fine.
1833 previous_tail_pred
= instructions
->tail_pred
;
1834 previous_operand_loc
= ast
->get_location();
1836 result
= ast
->hir(instructions
, state
);
1839 /* Any errors should have already been emitted in the loop above.
1841 error_emitted
= true;
1845 type
= NULL
; /* use result->type, not type. */
1846 assert(result
!= NULL
|| !needs_rvalue
);
1848 if (result
&& result
->type
->is_error() && !error_emitted
)
1849 _mesa_glsl_error(& loc
, state
, "type mismatch");
1856 ast_expression_statement::hir(exec_list
*instructions
,
1857 struct _mesa_glsl_parse_state
*state
)
1859 /* It is possible to have expression statements that don't have an
1860 * expression. This is the solitary semicolon:
1862 * for (i = 0; i < 5; i++)
1865 * In this case the expression will be NULL. Test for NULL and don't do
1866 * anything in that case.
1868 if (expression
!= NULL
)
1869 expression
->hir_no_rvalue(instructions
, state
);
1871 /* Statements do not have r-values.
1878 ast_compound_statement::hir(exec_list
*instructions
,
1879 struct _mesa_glsl_parse_state
*state
)
1882 state
->symbols
->push_scope();
1884 foreach_list_typed (ast_node
, ast
, link
, &this->statements
)
1885 ast
->hir(instructions
, state
);
1888 state
->symbols
->pop_scope();
1890 /* Compound statements do not have r-values.
1896 * Evaluate the given exec_node (which should be an ast_node representing
1897 * a single array dimension) and return its integer value.
1900 process_array_size(exec_node
*node
,
1901 struct _mesa_glsl_parse_state
*state
)
1903 exec_list dummy_instructions
;
1905 ast_node
*array_size
= exec_node_data(ast_node
, node
, link
);
1906 ir_rvalue
*const ir
= array_size
->hir(& dummy_instructions
, state
);
1907 YYLTYPE loc
= array_size
->get_location();
1910 _mesa_glsl_error(& loc
, state
,
1911 "array size could not be resolved");
1915 if (!ir
->type
->is_integer()) {
1916 _mesa_glsl_error(& loc
, state
,
1917 "array size must be integer type");
1921 if (!ir
->type
->is_scalar()) {
1922 _mesa_glsl_error(& loc
, state
,
1923 "array size must be scalar type");
1927 ir_constant
*const size
= ir
->constant_expression_value();
1929 _mesa_glsl_error(& loc
, state
, "array size must be a "
1930 "constant valued expression");
1934 if (size
->value
.i
[0] <= 0) {
1935 _mesa_glsl_error(& loc
, state
, "array size must be > 0");
1939 assert(size
->type
== ir
->type
);
1941 /* If the array size is const (and we've verified that
1942 * it is) then no instructions should have been emitted
1943 * when we converted it to HIR. If they were emitted,
1944 * then either the array size isn't const after all, or
1945 * we are emitting unnecessary instructions.
1947 assert(dummy_instructions
.is_empty());
1949 return size
->value
.u
[0];
1952 static const glsl_type
*
1953 process_array_type(YYLTYPE
*loc
, const glsl_type
*base
,
1954 ast_array_specifier
*array_specifier
,
1955 struct _mesa_glsl_parse_state
*state
)
1957 const glsl_type
*array_type
= base
;
1959 if (array_specifier
!= NULL
) {
1960 if (base
->is_array()) {
1962 /* From page 19 (page 25) of the GLSL 1.20 spec:
1964 * "Only one-dimensional arrays may be declared."
1966 if (!state
->ARB_arrays_of_arrays_enable
) {
1967 _mesa_glsl_error(loc
, state
,
1968 "invalid array of `%s'"
1969 "GL_ARB_arrays_of_arrays "
1970 "required for defining arrays of arrays",
1972 return glsl_type::error_type
;
1975 if (base
->length
== 0) {
1976 _mesa_glsl_error(loc
, state
,
1977 "only the outermost array dimension can "
1980 return glsl_type::error_type
;
1984 for (exec_node
*node
= array_specifier
->array_dimensions
.tail_pred
;
1985 !node
->is_head_sentinel(); node
= node
->prev
) {
1986 unsigned array_size
= process_array_size(node
, state
);
1987 array_type
= glsl_type::get_array_instance(array_type
, array_size
);
1990 if (array_specifier
->is_unsized_array
)
1991 array_type
= glsl_type::get_array_instance(array_type
, 0);
1999 ast_type_specifier::glsl_type(const char **name
,
2000 struct _mesa_glsl_parse_state
*state
) const
2002 const struct glsl_type
*type
;
2004 type
= state
->symbols
->get_type(this->type_name
);
2005 *name
= this->type_name
;
2007 YYLTYPE loc
= this->get_location();
2008 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
2014 ast_fully_specified_type::glsl_type(const char **name
,
2015 struct _mesa_glsl_parse_state
*state
) const
2017 const struct glsl_type
*type
= this->specifier
->glsl_type(name
, state
);
2022 if (type
->base_type
== GLSL_TYPE_FLOAT
2024 && state
->stage
== MESA_SHADER_FRAGMENT
2025 && this->qualifier
.precision
== ast_precision_none
2026 && state
->symbols
->get_variable("#default precision") == NULL
) {
2027 YYLTYPE loc
= this->get_location();
2028 _mesa_glsl_error(&loc
, state
,
2029 "no precision specified this scope for type `%s'",
2037 * Determine whether a toplevel variable declaration declares a varying. This
2038 * function operates by examining the variable's mode and the shader target,
2039 * so it correctly identifies linkage variables regardless of whether they are
2040 * declared using the deprecated "varying" syntax or the new "in/out" syntax.
2042 * Passing a non-toplevel variable declaration (e.g. a function parameter) to
2043 * this function will produce undefined results.
2046 is_varying_var(ir_variable
*var
, gl_shader_stage target
)
2049 case MESA_SHADER_VERTEX
:
2050 return var
->data
.mode
== ir_var_shader_out
;
2051 case MESA_SHADER_FRAGMENT
:
2052 return var
->data
.mode
== ir_var_shader_in
;
2054 return var
->data
.mode
== ir_var_shader_out
|| var
->data
.mode
== ir_var_shader_in
;
2060 * Matrix layout qualifiers are only allowed on certain types
2063 validate_matrix_layout_for_type(struct _mesa_glsl_parse_state
*state
,
2065 const glsl_type
*type
,
2068 if (var
&& !var
->is_in_buffer_block()) {
2069 /* Layout qualifiers may only apply to interface blocks and fields in
2072 _mesa_glsl_error(loc
, state
,
2073 "uniform block layout qualifiers row_major and "
2074 "column_major may not be applied to variables "
2075 "outside of uniform blocks");
2076 } else if (!type
->is_matrix()) {
2077 /* The OpenGL ES 3.0 conformance tests did not originally allow
2078 * matrix layout qualifiers on non-matrices. However, the OpenGL
2079 * 4.4 and OpenGL ES 3.0 (revision TBD) specifications were
2080 * amended to specifically allow these layouts on all types. Emit
2081 * a warning so that people know their code may not be portable.
2083 _mesa_glsl_warning(loc
, state
,
2084 "uniform block layout qualifiers row_major and "
2085 "column_major applied to non-matrix types may "
2086 "be rejected by older compilers");
2087 } else if (type
->is_record()) {
2088 /* We allow 'layout(row_major)' on structure types because it's the only
2089 * way to get row-major layouts on matrices contained in structures.
2091 _mesa_glsl_warning(loc
, state
,
2092 "uniform block layout qualifiers row_major and "
2093 "column_major applied to structure types is not "
2094 "strictly conformant and may be rejected by other "
2100 validate_binding_qualifier(struct _mesa_glsl_parse_state
*state
,
2102 const glsl_type
*type
,
2103 const ast_type_qualifier
*qual
)
2105 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
2106 _mesa_glsl_error(loc
, state
,
2107 "the \"binding\" qualifier only applies to uniforms and "
2108 "shader storage buffer objects");
2112 if (qual
->binding
< 0) {
2113 _mesa_glsl_error(loc
, state
, "binding values must be >= 0");
2117 const struct gl_context
*const ctx
= state
->ctx
;
2118 unsigned elements
= type
->is_array() ? type
->length
: 1;
2119 unsigned max_index
= qual
->binding
+ elements
- 1;
2120 const glsl_type
*base_type
= type
->without_array();
2122 if (base_type
->is_interface()) {
2123 /* UBOs. From page 60 of the GLSL 4.20 specification:
2124 * "If the binding point for any uniform block instance is less than zero,
2125 * or greater than or equal to the implementation-dependent maximum
2126 * number of uniform buffer bindings, a compilation error will occur.
2127 * When the binding identifier is used with a uniform block instanced as
2128 * an array of size N, all elements of the array from binding through
2129 * binding + N – 1 must be within this range."
2131 * The implementation-dependent maximum is GL_MAX_UNIFORM_BUFFER_BINDINGS.
2133 if (qual
->flags
.q
.uniform
&&
2134 max_index
>= ctx
->Const
.MaxUniformBufferBindings
) {
2135 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d UBOs exceeds "
2136 "the maximum number of UBO binding points (%d)",
2137 qual
->binding
, elements
,
2138 ctx
->Const
.MaxUniformBufferBindings
);
2142 /* SSBOs. From page 67 of the GLSL 4.30 specification:
2143 * "If the binding point for any uniform or shader storage block instance
2144 * is less than zero, or greater than or equal to the
2145 * implementation-dependent maximum number of uniform buffer bindings, a
2146 * compile-time error will occur. When the binding identifier is used
2147 * with a uniform or shader storage block instanced as an array of size
2148 * N, all elements of the array from binding through binding + N – 1 must
2149 * be within this range."
2151 if (qual
->flags
.q
.buffer
&&
2152 max_index
>= ctx
->Const
.MaxShaderStorageBufferBindings
) {
2153 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d SSBOs exceeds "
2154 "the maximum number of SSBO binding points (%d)",
2155 qual
->binding
, elements
,
2156 ctx
->Const
.MaxShaderStorageBufferBindings
);
2159 } else if (base_type
->is_sampler()) {
2160 /* Samplers. From page 63 of the GLSL 4.20 specification:
2161 * "If the binding is less than zero, or greater than or equal to the
2162 * implementation-dependent maximum supported number of units, a
2163 * compilation error will occur. When the binding identifier is used
2164 * with an array of size N, all elements of the array from binding
2165 * through binding + N - 1 must be within this range."
2167 unsigned limit
= ctx
->Const
.MaxCombinedTextureImageUnits
;
2169 if (max_index
>= limit
) {
2170 _mesa_glsl_error(loc
, state
, "layout(binding = %d) for %d samplers "
2171 "exceeds the maximum number of texture image units "
2172 "(%d)", qual
->binding
, elements
, limit
);
2176 } else if (base_type
->contains_atomic()) {
2177 assert(ctx
->Const
.MaxAtomicBufferBindings
<= MAX_COMBINED_ATOMIC_BUFFERS
);
2178 if (unsigned(qual
->binding
) >= ctx
->Const
.MaxAtomicBufferBindings
) {
2179 _mesa_glsl_error(loc
, state
, "layout(binding = %d) exceeds the "
2180 " maximum number of atomic counter buffer bindings"
2181 "(%d)", qual
->binding
,
2182 ctx
->Const
.MaxAtomicBufferBindings
);
2186 } else if (state
->is_version(420, 310) && base_type
->is_image()) {
2187 assert(ctx
->Const
.MaxImageUnits
<= MAX_IMAGE_UNITS
);
2188 if (max_index
>= ctx
->Const
.MaxImageUnits
) {
2189 _mesa_glsl_error(loc
, state
, "Image binding %d exceeds the "
2190 " maximum number of image units (%d)", max_index
,
2191 ctx
->Const
.MaxImageUnits
);
2196 _mesa_glsl_error(loc
, state
,
2197 "the \"binding\" qualifier only applies to uniform "
2198 "blocks, opaque variables, or arrays thereof");
2206 static glsl_interp_qualifier
2207 interpret_interpolation_qualifier(const struct ast_type_qualifier
*qual
,
2208 ir_variable_mode mode
,
2209 struct _mesa_glsl_parse_state
*state
,
2212 glsl_interp_qualifier interpolation
;
2213 if (qual
->flags
.q
.flat
)
2214 interpolation
= INTERP_QUALIFIER_FLAT
;
2215 else if (qual
->flags
.q
.noperspective
)
2216 interpolation
= INTERP_QUALIFIER_NOPERSPECTIVE
;
2217 else if (qual
->flags
.q
.smooth
)
2218 interpolation
= INTERP_QUALIFIER_SMOOTH
;
2220 interpolation
= INTERP_QUALIFIER_NONE
;
2222 if (interpolation
!= INTERP_QUALIFIER_NONE
) {
2223 if (mode
!= ir_var_shader_in
&& mode
!= ir_var_shader_out
) {
2224 _mesa_glsl_error(loc
, state
,
2225 "interpolation qualifier `%s' can only be applied to "
2226 "shader inputs or outputs.",
2227 interpolation_string(interpolation
));
2231 if ((state
->stage
== MESA_SHADER_VERTEX
&& mode
== ir_var_shader_in
) ||
2232 (state
->stage
== MESA_SHADER_FRAGMENT
&& mode
== ir_var_shader_out
)) {
2233 _mesa_glsl_error(loc
, state
,
2234 "interpolation qualifier `%s' cannot be applied to "
2235 "vertex shader inputs or fragment shader outputs",
2236 interpolation_string(interpolation
));
2240 return interpolation
;
2245 validate_explicit_location(const struct ast_type_qualifier
*qual
,
2247 struct _mesa_glsl_parse_state
*state
,
2252 /* Checks for GL_ARB_explicit_uniform_location. */
2253 if (qual
->flags
.q
.uniform
) {
2254 if (!state
->check_explicit_uniform_location_allowed(loc
, var
))
2257 const struct gl_context
*const ctx
= state
->ctx
;
2258 unsigned max_loc
= qual
->location
+ var
->type
->uniform_locations() - 1;
2260 /* ARB_explicit_uniform_location specification states:
2262 * "The explicitly defined locations and the generated locations
2263 * must be in the range of 0 to MAX_UNIFORM_LOCATIONS minus one."
2265 * "Valid locations for default-block uniform variable locations
2266 * are in the range of 0 to the implementation-defined maximum
2267 * number of uniform locations."
2269 if (qual
->location
< 0) {
2270 _mesa_glsl_error(loc
, state
,
2271 "explicit location < 0 for uniform %s", var
->name
);
2275 if (max_loc
>= ctx
->Const
.MaxUserAssignableUniformLocations
) {
2276 _mesa_glsl_error(loc
, state
, "location(s) consumed by uniform %s "
2277 ">= MAX_UNIFORM_LOCATIONS (%u)", var
->name
,
2278 ctx
->Const
.MaxUserAssignableUniformLocations
);
2282 var
->data
.explicit_location
= true;
2283 var
->data
.location
= qual
->location
;
2287 /* Between GL_ARB_explicit_attrib_location an
2288 * GL_ARB_separate_shader_objects, the inputs and outputs of any shader
2289 * stage can be assigned explicit locations. The checking here associates
2290 * the correct extension with the correct stage's input / output:
2294 * vertex explicit_loc sso
2295 * tess control sso sso
2298 * fragment sso explicit_loc
2300 switch (state
->stage
) {
2301 case MESA_SHADER_VERTEX
:
2302 if (var
->data
.mode
== ir_var_shader_in
) {
2303 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2309 if (var
->data
.mode
== ir_var_shader_out
) {
2310 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2319 case MESA_SHADER_TESS_CTRL
:
2320 case MESA_SHADER_TESS_EVAL
:
2321 case MESA_SHADER_GEOMETRY
:
2322 if (var
->data
.mode
== ir_var_shader_in
|| var
->data
.mode
== ir_var_shader_out
) {
2323 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2332 case MESA_SHADER_FRAGMENT
:
2333 if (var
->data
.mode
== ir_var_shader_in
) {
2334 if (!state
->check_separate_shader_objects_allowed(loc
, var
))
2340 if (var
->data
.mode
== ir_var_shader_out
) {
2341 if (!state
->check_explicit_attrib_location_allowed(loc
, var
))
2350 case MESA_SHADER_COMPUTE
:
2351 _mesa_glsl_error(loc
, state
,
2352 "compute shader variables cannot be given "
2353 "explicit locations");
2358 _mesa_glsl_error(loc
, state
,
2359 "%s cannot be given an explicit location in %s shader",
2361 _mesa_shader_stage_to_string(state
->stage
));
2363 var
->data
.explicit_location
= true;
2365 /* This bit of silliness is needed because invalid explicit locations
2366 * are supposed to be flagged during linking. Small negative values
2367 * biased by VERT_ATTRIB_GENERIC0 or FRAG_RESULT_DATA0 could alias
2368 * built-in values (e.g., -16+VERT_ATTRIB_GENERIC0 = VERT_ATTRIB_POS).
2369 * The linker needs to be able to differentiate these cases. This
2370 * ensures that negative values stay negative.
2372 if (qual
->location
>= 0) {
2373 switch (state
->stage
) {
2374 case MESA_SHADER_VERTEX
:
2375 var
->data
.location
= (var
->data
.mode
== ir_var_shader_in
)
2376 ? (qual
->location
+ VERT_ATTRIB_GENERIC0
)
2377 : (qual
->location
+ VARYING_SLOT_VAR0
);
2380 case MESA_SHADER_TESS_CTRL
:
2381 case MESA_SHADER_TESS_EVAL
:
2382 case MESA_SHADER_GEOMETRY
:
2383 if (var
->data
.patch
)
2384 var
->data
.location
= qual
->location
+ VARYING_SLOT_PATCH0
;
2386 var
->data
.location
= qual
->location
+ VARYING_SLOT_VAR0
;
2389 case MESA_SHADER_FRAGMENT
:
2390 var
->data
.location
= (var
->data
.mode
== ir_var_shader_out
)
2391 ? (qual
->location
+ FRAG_RESULT_DATA0
)
2392 : (qual
->location
+ VARYING_SLOT_VAR0
);
2394 case MESA_SHADER_COMPUTE
:
2395 assert(!"Unexpected shader type");
2399 var
->data
.location
= qual
->location
;
2402 if (qual
->flags
.q
.explicit_index
) {
2403 /* From the GLSL 4.30 specification, section 4.4.2 (Output
2404 * Layout Qualifiers):
2406 * "It is also a compile-time error if a fragment shader
2407 * sets a layout index to less than 0 or greater than 1."
2409 * Older specifications don't mandate a behavior; we take
2410 * this as a clarification and always generate the error.
2412 if (qual
->index
< 0 || qual
->index
> 1) {
2413 _mesa_glsl_error(loc
, state
,
2414 "explicit index may only be 0 or 1");
2416 var
->data
.explicit_index
= true;
2417 var
->data
.index
= qual
->index
;
2424 apply_image_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2426 struct _mesa_glsl_parse_state
*state
,
2429 const glsl_type
*base_type
= var
->type
->without_array();
2431 if (base_type
->is_image()) {
2432 if (var
->data
.mode
!= ir_var_uniform
&&
2433 var
->data
.mode
!= ir_var_function_in
) {
2434 _mesa_glsl_error(loc
, state
, "image variables may only be declared as "
2435 "function parameters or uniform-qualified "
2436 "global variables");
2439 var
->data
.image_read_only
|= qual
->flags
.q
.read_only
;
2440 var
->data
.image_write_only
|= qual
->flags
.q
.write_only
;
2441 var
->data
.image_coherent
|= qual
->flags
.q
.coherent
;
2442 var
->data
.image_volatile
|= qual
->flags
.q
._volatile
;
2443 var
->data
.image_restrict
|= qual
->flags
.q
.restrict_flag
;
2444 var
->data
.read_only
= true;
2446 if (qual
->flags
.q
.explicit_image_format
) {
2447 if (var
->data
.mode
== ir_var_function_in
) {
2448 _mesa_glsl_error(loc
, state
, "format qualifiers cannot be "
2449 "used on image function parameters");
2452 if (qual
->image_base_type
!= base_type
->sampler_type
) {
2453 _mesa_glsl_error(loc
, state
, "format qualifier doesn't match the "
2454 "base data type of the image");
2457 var
->data
.image_format
= qual
->image_format
;
2459 if (var
->data
.mode
== ir_var_uniform
) {
2460 if (state
->es_shader
) {
2461 _mesa_glsl_error(loc
, state
, "all image uniforms "
2462 "must have a format layout qualifier");
2464 } else if (!qual
->flags
.q
.write_only
) {
2465 _mesa_glsl_error(loc
, state
, "image uniforms not qualified with "
2466 "`writeonly' must have a format layout "
2471 var
->data
.image_format
= GL_NONE
;
2474 /* From page 70 of the GLSL ES 3.1 specification:
2476 * "Except for image variables qualified with the format qualifiers
2477 * r32f, r32i, and r32ui, image variables must specify either memory
2478 * qualifier readonly or the memory qualifier writeonly."
2480 if (state
->es_shader
&&
2481 var
->data
.image_format
!= GL_R32F
&&
2482 var
->data
.image_format
!= GL_R32I
&&
2483 var
->data
.image_format
!= GL_R32UI
&&
2484 !var
->data
.image_read_only
&&
2485 !var
->data
.image_write_only
) {
2486 _mesa_glsl_error(loc
, state
, "image variables of format other than "
2487 "r32f, r32i or r32ui must be qualified `readonly' or "
2491 } else if (qual
->flags
.q
.read_only
||
2492 qual
->flags
.q
.write_only
||
2493 qual
->flags
.q
.coherent
||
2494 qual
->flags
.q
._volatile
||
2495 qual
->flags
.q
.restrict_flag
||
2496 qual
->flags
.q
.explicit_image_format
) {
2497 _mesa_glsl_error(loc
, state
, "memory qualifiers may only be applied to "
2502 static inline const char*
2503 get_layout_qualifier_string(bool origin_upper_left
, bool pixel_center_integer
)
2505 if (origin_upper_left
&& pixel_center_integer
)
2506 return "origin_upper_left, pixel_center_integer";
2507 else if (origin_upper_left
)
2508 return "origin_upper_left";
2509 else if (pixel_center_integer
)
2510 return "pixel_center_integer";
2516 is_conflicting_fragcoord_redeclaration(struct _mesa_glsl_parse_state
*state
,
2517 const struct ast_type_qualifier
*qual
)
2519 /* If gl_FragCoord was previously declared, and the qualifiers were
2520 * different in any way, return true.
2522 if (state
->fs_redeclares_gl_fragcoord
) {
2523 return (state
->fs_pixel_center_integer
!= qual
->flags
.q
.pixel_center_integer
2524 || state
->fs_origin_upper_left
!= qual
->flags
.q
.origin_upper_left
);
2531 apply_type_qualifier_to_variable(const struct ast_type_qualifier
*qual
,
2533 struct _mesa_glsl_parse_state
*state
,
2537 STATIC_ASSERT(sizeof(qual
->flags
.q
) <= sizeof(qual
->flags
.i
));
2539 if (qual
->flags
.q
.invariant
) {
2540 if (var
->data
.used
) {
2541 _mesa_glsl_error(loc
, state
,
2542 "variable `%s' may not be redeclared "
2543 "`invariant' after being used",
2546 var
->data
.invariant
= 1;
2550 if (qual
->flags
.q
.precise
) {
2551 if (var
->data
.used
) {
2552 _mesa_glsl_error(loc
, state
,
2553 "variable `%s' may not be redeclared "
2554 "`precise' after being used",
2557 var
->data
.precise
= 1;
2561 if (qual
->flags
.q
.subroutine
&& !qual
->flags
.q
.uniform
) {
2562 _mesa_glsl_error(loc
, state
,
2563 "`subroutine' may only be applied to uniforms, "
2564 "subroutine type declarations, or function definitions");
2567 if (qual
->flags
.q
.constant
|| qual
->flags
.q
.attribute
2568 || qual
->flags
.q
.uniform
2569 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2570 var
->data
.read_only
= 1;
2572 if (qual
->flags
.q
.centroid
)
2573 var
->data
.centroid
= 1;
2575 if (qual
->flags
.q
.sample
)
2576 var
->data
.sample
= 1;
2578 if (state
->stage
== MESA_SHADER_GEOMETRY
&&
2579 qual
->flags
.q
.out
&& qual
->flags
.q
.stream
) {
2580 var
->data
.stream
= qual
->stream
;
2583 if (qual
->flags
.q
.patch
)
2584 var
->data
.patch
= 1;
2586 if (qual
->flags
.q
.attribute
&& state
->stage
!= MESA_SHADER_VERTEX
) {
2587 var
->type
= glsl_type::error_type
;
2588 _mesa_glsl_error(loc
, state
,
2589 "`attribute' variables may not be declared in the "
2591 _mesa_shader_stage_to_string(state
->stage
));
2594 /* Disallow layout qualifiers which may only appear on layout declarations. */
2595 if (qual
->flags
.q
.prim_type
) {
2596 _mesa_glsl_error(loc
, state
,
2597 "Primitive type may only be specified on GS input or output "
2598 "layout declaration, not on variables.");
2601 /* Section 6.1.1 (Function Calling Conventions) of the GLSL 1.10 spec says:
2603 * "However, the const qualifier cannot be used with out or inout."
2605 * The same section of the GLSL 4.40 spec further clarifies this saying:
2607 * "The const qualifier cannot be used with out or inout, or a
2608 * compile-time error results."
2610 if (is_parameter
&& qual
->flags
.q
.constant
&& qual
->flags
.q
.out
) {
2611 _mesa_glsl_error(loc
, state
,
2612 "`const' may not be applied to `out' or `inout' "
2613 "function parameters");
2616 /* If there is no qualifier that changes the mode of the variable, leave
2617 * the setting alone.
2619 assert(var
->data
.mode
!= ir_var_temporary
);
2620 if (qual
->flags
.q
.in
&& qual
->flags
.q
.out
)
2621 var
->data
.mode
= ir_var_function_inout
;
2622 else if (qual
->flags
.q
.in
)
2623 var
->data
.mode
= is_parameter
? ir_var_function_in
: ir_var_shader_in
;
2624 else if (qual
->flags
.q
.attribute
2625 || (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_FRAGMENT
)))
2626 var
->data
.mode
= ir_var_shader_in
;
2627 else if (qual
->flags
.q
.out
)
2628 var
->data
.mode
= is_parameter
? ir_var_function_out
: ir_var_shader_out
;
2629 else if (qual
->flags
.q
.varying
&& (state
->stage
== MESA_SHADER_VERTEX
))
2630 var
->data
.mode
= ir_var_shader_out
;
2631 else if (qual
->flags
.q
.uniform
)
2632 var
->data
.mode
= ir_var_uniform
;
2633 else if (qual
->flags
.q
.buffer
)
2634 var
->data
.mode
= ir_var_shader_storage
;
2636 if (!is_parameter
&& is_varying_var(var
, state
->stage
)) {
2637 /* User-defined ins/outs are not permitted in compute shaders. */
2638 if (state
->stage
== MESA_SHADER_COMPUTE
) {
2639 _mesa_glsl_error(loc
, state
,
2640 "user-defined input and output variables are not "
2641 "permitted in compute shaders");
2644 /* This variable is being used to link data between shader stages (in
2645 * pre-glsl-1.30 parlance, it's a "varying"). Check that it has a type
2646 * that is allowed for such purposes.
2648 * From page 25 (page 31 of the PDF) of the GLSL 1.10 spec:
2650 * "The varying qualifier can be used only with the data types
2651 * float, vec2, vec3, vec4, mat2, mat3, and mat4, or arrays of
2654 * This was relaxed in GLSL version 1.30 and GLSL ES version 3.00. From
2655 * page 31 (page 37 of the PDF) of the GLSL 1.30 spec:
2657 * "Fragment inputs can only be signed and unsigned integers and
2658 * integer vectors, float, floating-point vectors, matrices, or
2659 * arrays of these. Structures cannot be input.
2661 * Similar text exists in the section on vertex shader outputs.
2663 * Similar text exists in the GLSL ES 3.00 spec, except that the GLSL ES
2664 * 3.00 spec allows structs as well. Varying structs are also allowed
2667 switch (var
->type
->get_scalar_type()->base_type
) {
2668 case GLSL_TYPE_FLOAT
:
2669 /* Ok in all GLSL versions */
2671 case GLSL_TYPE_UINT
:
2673 if (state
->is_version(130, 300))
2675 _mesa_glsl_error(loc
, state
,
2676 "varying variables must be of base type float in %s",
2677 state
->get_version_string());
2679 case GLSL_TYPE_STRUCT
:
2680 if (state
->is_version(150, 300))
2682 _mesa_glsl_error(loc
, state
,
2683 "varying variables may not be of type struct");
2685 case GLSL_TYPE_DOUBLE
:
2688 _mesa_glsl_error(loc
, state
, "illegal type for a varying variable");
2693 if (state
->all_invariant
&& (state
->current_function
== NULL
)) {
2694 switch (state
->stage
) {
2695 case MESA_SHADER_VERTEX
:
2696 if (var
->data
.mode
== ir_var_shader_out
)
2697 var
->data
.invariant
= true;
2699 case MESA_SHADER_TESS_CTRL
:
2700 case MESA_SHADER_TESS_EVAL
:
2701 case MESA_SHADER_GEOMETRY
:
2702 if ((var
->data
.mode
== ir_var_shader_in
)
2703 || (var
->data
.mode
== ir_var_shader_out
))
2704 var
->data
.invariant
= true;
2706 case MESA_SHADER_FRAGMENT
:
2707 if (var
->data
.mode
== ir_var_shader_in
)
2708 var
->data
.invariant
= true;
2710 case MESA_SHADER_COMPUTE
:
2711 /* Invariance isn't meaningful in compute shaders. */
2716 var
->data
.interpolation
=
2717 interpret_interpolation_qualifier(qual
, (ir_variable_mode
) var
->data
.mode
,
2720 var
->data
.pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2721 var
->data
.origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2722 if ((qual
->flags
.q
.origin_upper_left
|| qual
->flags
.q
.pixel_center_integer
)
2723 && (strcmp(var
->name
, "gl_FragCoord") != 0)) {
2724 const char *const qual_string
= (qual
->flags
.q
.origin_upper_left
)
2725 ? "origin_upper_left" : "pixel_center_integer";
2727 _mesa_glsl_error(loc
, state
,
2728 "layout qualifier `%s' can only be applied to "
2729 "fragment shader input `gl_FragCoord'",
2733 if (var
->name
!= NULL
&& strcmp(var
->name
, "gl_FragCoord") == 0) {
2735 /* Section 4.3.8.1, page 39 of GLSL 1.50 spec says:
2737 * "Within any shader, the first redeclarations of gl_FragCoord
2738 * must appear before any use of gl_FragCoord."
2740 * Generate a compiler error if above condition is not met by the
2743 ir_variable
*earlier
= state
->symbols
->get_variable("gl_FragCoord");
2744 if (earlier
!= NULL
&&
2745 earlier
->data
.used
&&
2746 !state
->fs_redeclares_gl_fragcoord
) {
2747 _mesa_glsl_error(loc
, state
,
2748 "gl_FragCoord used before its first redeclaration "
2749 "in fragment shader");
2752 /* Make sure all gl_FragCoord redeclarations specify the same layout
2755 if (is_conflicting_fragcoord_redeclaration(state
, qual
)) {
2756 const char *const qual_string
=
2757 get_layout_qualifier_string(qual
->flags
.q
.origin_upper_left
,
2758 qual
->flags
.q
.pixel_center_integer
);
2760 const char *const state_string
=
2761 get_layout_qualifier_string(state
->fs_origin_upper_left
,
2762 state
->fs_pixel_center_integer
);
2764 _mesa_glsl_error(loc
, state
,
2765 "gl_FragCoord redeclared with different layout "
2766 "qualifiers (%s) and (%s) ",
2770 state
->fs_origin_upper_left
= qual
->flags
.q
.origin_upper_left
;
2771 state
->fs_pixel_center_integer
= qual
->flags
.q
.pixel_center_integer
;
2772 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
=
2773 !qual
->flags
.q
.origin_upper_left
&& !qual
->flags
.q
.pixel_center_integer
;
2774 state
->fs_redeclares_gl_fragcoord
=
2775 state
->fs_origin_upper_left
||
2776 state
->fs_pixel_center_integer
||
2777 state
->fs_redeclares_gl_fragcoord_with_no_layout_qualifiers
;
2780 if (qual
->flags
.q
.vk_set
) {
2781 if (!qual
->flags
.q
.explicit_binding
)
2782 _mesa_glsl_error(loc
, state
,
2783 "Vulkan descriptor set layout requires both set "
2784 "and binding qualifiers");
2786 var
->data
.vk_set
= true;
2787 var
->data
.set
= qual
->set
;
2788 var
->data
.binding
= qual
->binding
;
2789 } else if (qual
->flags
.q
.explicit_location
) {
2790 validate_explicit_location(qual
, var
, state
, loc
);
2791 } else if (qual
->flags
.q
.explicit_index
) {
2792 _mesa_glsl_error(loc
, state
, "explicit index requires explicit location");
2795 if (qual
->flags
.q
.explicit_binding
&&
2796 validate_binding_qualifier(state
, loc
, var
->type
, qual
)) {
2797 var
->data
.explicit_binding
= true;
2798 var
->data
.binding
= qual
->binding
;
2801 if (var
->type
->contains_atomic()) {
2802 if (var
->data
.mode
== ir_var_uniform
) {
2803 if (var
->data
.explicit_binding
) {
2805 &state
->atomic_counter_offsets
[var
->data
.binding
];
2807 if (*offset
% ATOMIC_COUNTER_SIZE
)
2808 _mesa_glsl_error(loc
, state
,
2809 "misaligned atomic counter offset");
2811 var
->data
.atomic
.offset
= *offset
;
2812 *offset
+= var
->type
->atomic_size();
2815 _mesa_glsl_error(loc
, state
,
2816 "atomic counters require explicit binding point");
2818 } else if (var
->data
.mode
!= ir_var_function_in
) {
2819 _mesa_glsl_error(loc
, state
, "atomic counters may only be declared as "
2820 "function parameters or uniform-qualified "
2821 "global variables");
2825 /* Does the declaration use the deprecated 'attribute' or 'varying'
2828 const bool uses_deprecated_qualifier
= qual
->flags
.q
.attribute
2829 || qual
->flags
.q
.varying
;
2832 /* Validate auxiliary storage qualifiers */
2834 /* From section 4.3.4 of the GLSL 1.30 spec:
2835 * "It is an error to use centroid in in a vertex shader."
2837 * From section 4.3.4 of the GLSL ES 3.00 spec:
2838 * "It is an error to use centroid in or interpolation qualifiers in
2839 * a vertex shader input."
2842 /* Section 4.3.6 of the GLSL 1.30 specification states:
2843 * "It is an error to use centroid out in a fragment shader."
2845 * The GL_ARB_shading_language_420pack extension specification states:
2846 * "It is an error to use auxiliary storage qualifiers or interpolation
2847 * qualifiers on an output in a fragment shader."
2849 if (qual
->flags
.q
.sample
&& (!is_varying_var(var
, state
->stage
) || uses_deprecated_qualifier
)) {
2850 _mesa_glsl_error(loc
, state
,
2851 "sample qualifier may only be used on `in` or `out` "
2852 "variables between shader stages");
2854 if (qual
->flags
.q
.centroid
&& !is_varying_var(var
, state
->stage
)) {
2855 _mesa_glsl_error(loc
, state
,
2856 "centroid qualifier may only be used with `in', "
2857 "`out' or `varying' variables between shader stages");
2861 /* Is the 'layout' keyword used with parameters that allow relaxed checking.
2862 * Many implementations of GL_ARB_fragment_coord_conventions_enable and some
2863 * implementations (only Mesa?) GL_ARB_explicit_attrib_location_enable
2864 * allowed the layout qualifier to be used with 'varying' and 'attribute'.
2865 * These extensions and all following extensions that add the 'layout'
2866 * keyword have been modified to require the use of 'in' or 'out'.
2868 * The following extension do not allow the deprecated keywords:
2870 * GL_AMD_conservative_depth
2871 * GL_ARB_conservative_depth
2872 * GL_ARB_gpu_shader5
2873 * GL_ARB_separate_shader_objects
2874 * GL_ARB_tessellation_shader
2875 * GL_ARB_transform_feedback3
2876 * GL_ARB_uniform_buffer_object
2878 * It is unknown whether GL_EXT_shader_image_load_store or GL_NV_gpu_shader5
2879 * allow layout with the deprecated keywords.
2881 const bool relaxed_layout_qualifier_checking
=
2882 state
->ARB_fragment_coord_conventions_enable
;
2884 if (qual
->has_layout() && uses_deprecated_qualifier
) {
2885 if (relaxed_layout_qualifier_checking
) {
2886 _mesa_glsl_warning(loc
, state
,
2887 "`layout' qualifier may not be used with "
2888 "`attribute' or `varying'");
2890 _mesa_glsl_error(loc
, state
,
2891 "`layout' qualifier may not be used with "
2892 "`attribute' or `varying'");
2896 /* Layout qualifiers for gl_FragDepth, which are enabled by extension
2897 * AMD_conservative_depth.
2899 int depth_layout_count
= qual
->flags
.q
.depth_any
2900 + qual
->flags
.q
.depth_greater
2901 + qual
->flags
.q
.depth_less
2902 + qual
->flags
.q
.depth_unchanged
;
2903 if (depth_layout_count
> 0
2904 && !state
->AMD_conservative_depth_enable
2905 && !state
->ARB_conservative_depth_enable
) {
2906 _mesa_glsl_error(loc
, state
,
2907 "extension GL_AMD_conservative_depth or "
2908 "GL_ARB_conservative_depth must be enabled "
2909 "to use depth layout qualifiers");
2910 } else if (depth_layout_count
> 0
2911 && strcmp(var
->name
, "gl_FragDepth") != 0) {
2912 _mesa_glsl_error(loc
, state
,
2913 "depth layout qualifiers can be applied only to "
2915 } else if (depth_layout_count
> 1
2916 && strcmp(var
->name
, "gl_FragDepth") == 0) {
2917 _mesa_glsl_error(loc
, state
,
2918 "at most one depth layout qualifier can be applied to "
2921 if (qual
->flags
.q
.depth_any
)
2922 var
->data
.depth_layout
= ir_depth_layout_any
;
2923 else if (qual
->flags
.q
.depth_greater
)
2924 var
->data
.depth_layout
= ir_depth_layout_greater
;
2925 else if (qual
->flags
.q
.depth_less
)
2926 var
->data
.depth_layout
= ir_depth_layout_less
;
2927 else if (qual
->flags
.q
.depth_unchanged
)
2928 var
->data
.depth_layout
= ir_depth_layout_unchanged
;
2930 var
->data
.depth_layout
= ir_depth_layout_none
;
2932 if (qual
->flags
.q
.std140
||
2933 qual
->flags
.q
.packed
||
2934 qual
->flags
.q
.shared
) {
2935 _mesa_glsl_error(loc
, state
,
2936 "uniform block layout qualifiers std140, packed, and "
2937 "shared can only be applied to uniform blocks, not "
2941 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
2942 validate_matrix_layout_for_type(state
, loc
, var
->type
, var
);
2945 apply_image_qualifier_to_variable(qual
, var
, state
, loc
);
2947 /* From section 4.4.1.3 of the GLSL 4.50 specification (Fragment Shader
2950 * "Fragment shaders also allow the following layout qualifier on in only
2951 * (not with variable declarations)
2952 * layout-qualifier-id
2953 * early_fragment_tests
2956 if (qual
->flags
.q
.early_fragment_tests
) {
2957 _mesa_glsl_error(loc
, state
, "early_fragment_tests layout qualifier only "
2958 "valid in fragment shader input layout declaration.");
2963 * Get the variable that is being redeclared by this declaration
2965 * Semantic checks to verify the validity of the redeclaration are also
2966 * performed. If semantic checks fail, compilation error will be emitted via
2967 * \c _mesa_glsl_error, but a non-\c NULL pointer will still be returned.
2970 * A pointer to an existing variable in the current scope if the declaration
2971 * is a redeclaration, \c NULL otherwise.
2973 static ir_variable
*
2974 get_variable_being_redeclared(ir_variable
*var
, YYLTYPE loc
,
2975 struct _mesa_glsl_parse_state
*state
,
2976 bool allow_all_redeclarations
)
2978 /* Check if this declaration is actually a re-declaration, either to
2979 * resize an array or add qualifiers to an existing variable.
2981 * This is allowed for variables in the current scope, or when at
2982 * global scope (for built-ins in the implicit outer scope).
2984 ir_variable
*earlier
= state
->symbols
->get_variable(var
->name
);
2985 if (earlier
== NULL
||
2986 (state
->current_function
!= NULL
&&
2987 !state
->symbols
->name_declared_this_scope(var
->name
))) {
2992 /* From page 24 (page 30 of the PDF) of the GLSL 1.50 spec,
2994 * "It is legal to declare an array without a size and then
2995 * later re-declare the same name as an array of the same
2996 * type and specify a size."
2998 if (earlier
->type
->is_unsized_array() && var
->type
->is_array()
2999 && (var
->type
->fields
.array
== earlier
->type
->fields
.array
)) {
3000 /* FINISHME: This doesn't match the qualifiers on the two
3001 * FINISHME: declarations. It's not 100% clear whether this is
3002 * FINISHME: required or not.
3005 const unsigned size
= unsigned(var
->type
->array_size());
3006 check_builtin_array_max_size(var
->name
, size
, loc
, state
);
3007 if ((size
> 0) && (size
<= earlier
->data
.max_array_access
)) {
3008 _mesa_glsl_error(& loc
, state
, "array size must be > %u due to "
3010 earlier
->data
.max_array_access
);
3013 earlier
->type
= var
->type
;
3016 } else if ((state
->ARB_fragment_coord_conventions_enable
||
3017 state
->is_version(150, 0))
3018 && strcmp(var
->name
, "gl_FragCoord") == 0
3019 && earlier
->type
== var
->type
3020 && earlier
->data
.mode
== var
->data
.mode
) {
3021 /* Allow redeclaration of gl_FragCoord for ARB_fcc layout
3024 earlier
->data
.origin_upper_left
= var
->data
.origin_upper_left
;
3025 earlier
->data
.pixel_center_integer
= var
->data
.pixel_center_integer
;
3027 /* According to section 4.3.7 of the GLSL 1.30 spec,
3028 * the following built-in varaibles can be redeclared with an
3029 * interpolation qualifier:
3032 * * gl_FrontSecondaryColor
3033 * * gl_BackSecondaryColor
3035 * * gl_SecondaryColor
3037 } else if (state
->is_version(130, 0)
3038 && (strcmp(var
->name
, "gl_FrontColor") == 0
3039 || strcmp(var
->name
, "gl_BackColor") == 0
3040 || strcmp(var
->name
, "gl_FrontSecondaryColor") == 0
3041 || strcmp(var
->name
, "gl_BackSecondaryColor") == 0
3042 || strcmp(var
->name
, "gl_Color") == 0
3043 || strcmp(var
->name
, "gl_SecondaryColor") == 0)
3044 && earlier
->type
== var
->type
3045 && earlier
->data
.mode
== var
->data
.mode
) {
3046 earlier
->data
.interpolation
= var
->data
.interpolation
;
3048 /* Layout qualifiers for gl_FragDepth. */
3049 } else if ((state
->AMD_conservative_depth_enable
||
3050 state
->ARB_conservative_depth_enable
)
3051 && strcmp(var
->name
, "gl_FragDepth") == 0
3052 && earlier
->type
== var
->type
3053 && earlier
->data
.mode
== var
->data
.mode
) {
3055 /** From the AMD_conservative_depth spec:
3056 * Within any shader, the first redeclarations of gl_FragDepth
3057 * must appear before any use of gl_FragDepth.
3059 if (earlier
->data
.used
) {
3060 _mesa_glsl_error(&loc
, state
,
3061 "the first redeclaration of gl_FragDepth "
3062 "must appear before any use of gl_FragDepth");
3065 /* Prevent inconsistent redeclaration of depth layout qualifier. */
3066 if (earlier
->data
.depth_layout
!= ir_depth_layout_none
3067 && earlier
->data
.depth_layout
!= var
->data
.depth_layout
) {
3068 _mesa_glsl_error(&loc
, state
,
3069 "gl_FragDepth: depth layout is declared here "
3070 "as '%s, but it was previously declared as "
3072 depth_layout_string(var
->data
.depth_layout
),
3073 depth_layout_string(earlier
->data
.depth_layout
));
3076 earlier
->data
.depth_layout
= var
->data
.depth_layout
;
3078 } else if (allow_all_redeclarations
) {
3079 if (earlier
->data
.mode
!= var
->data
.mode
) {
3080 _mesa_glsl_error(&loc
, state
,
3081 "redeclaration of `%s' with incorrect qualifiers",
3083 } else if (earlier
->type
!= var
->type
) {
3084 _mesa_glsl_error(&loc
, state
,
3085 "redeclaration of `%s' has incorrect type",
3089 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
3096 * Generate the IR for an initializer in a variable declaration
3099 process_initializer(ir_variable
*var
, ast_declaration
*decl
,
3100 ast_fully_specified_type
*type
,
3101 exec_list
*initializer_instructions
,
3102 struct _mesa_glsl_parse_state
*state
)
3104 ir_rvalue
*result
= NULL
;
3106 YYLTYPE initializer_loc
= decl
->initializer
->get_location();
3108 /* From page 24 (page 30 of the PDF) of the GLSL 1.10 spec:
3110 * "All uniform variables are read-only and are initialized either
3111 * directly by an application via API commands, or indirectly by
3114 if (var
->data
.mode
== ir_var_uniform
) {
3115 state
->check_version(120, 0, &initializer_loc
,
3116 "cannot initialize uniforms");
3119 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3121 * "Buffer variables cannot have initializers."
3123 if (var
->data
.mode
== ir_var_shader_storage
) {
3124 _mesa_glsl_error(& initializer_loc
, state
,
3125 "SSBO variables cannot have initializers");
3128 /* From section 4.1.7 of the GLSL 4.40 spec:
3130 * "Opaque variables [...] are initialized only through the
3131 * OpenGL API; they cannot be declared with an initializer in a
3134 if (var
->type
->contains_opaque()) {
3135 _mesa_glsl_error(& initializer_loc
, state
,
3136 "cannot initialize opaque variable");
3139 if ((var
->data
.mode
== ir_var_shader_in
) && (state
->current_function
== NULL
)) {
3140 _mesa_glsl_error(& initializer_loc
, state
,
3141 "cannot initialize %s shader input / %s",
3142 _mesa_shader_stage_to_string(state
->stage
),
3143 (state
->stage
== MESA_SHADER_VERTEX
)
3144 ? "attribute" : "varying");
3147 /* If the initializer is an ast_aggregate_initializer, recursively store
3148 * type information from the LHS into it, so that its hir() function can do
3151 if (decl
->initializer
->oper
== ast_aggregate
)
3152 _mesa_ast_set_aggregate_type(var
->type
, decl
->initializer
);
3154 ir_dereference
*const lhs
= new(state
) ir_dereference_variable(var
);
3155 ir_rvalue
*rhs
= decl
->initializer
->hir(initializer_instructions
, state
);
3157 /* Calculate the constant value if this is a const or uniform
3160 if (type
->qualifier
.flags
.q
.constant
3161 || type
->qualifier
.flags
.q
.uniform
) {
3162 ir_rvalue
*new_rhs
= validate_assignment(state
, initializer_loc
,
3164 if (new_rhs
!= NULL
) {
3167 ir_constant
*constant_value
= rhs
->constant_expression_value();
3168 if (!constant_value
) {
3169 /* If ARB_shading_language_420pack is enabled, initializers of
3170 * const-qualified local variables do not have to be constant
3171 * expressions. Const-qualified global variables must still be
3172 * initialized with constant expressions.
3174 if (!state
->ARB_shading_language_420pack_enable
3175 || state
->current_function
== NULL
) {
3176 _mesa_glsl_error(& initializer_loc
, state
,
3177 "initializer of %s variable `%s' must be a "
3178 "constant expression",
3179 (type
->qualifier
.flags
.q
.constant
)
3180 ? "const" : "uniform",
3182 if (var
->type
->is_numeric()) {
3183 /* Reduce cascading errors. */
3184 var
->constant_value
= ir_constant::zero(state
, var
->type
);
3188 rhs
= constant_value
;
3189 var
->constant_value
= constant_value
;
3192 if (var
->type
->is_numeric()) {
3193 /* Reduce cascading errors. */
3194 var
->constant_value
= ir_constant::zero(state
, var
->type
);
3199 if (rhs
&& !rhs
->type
->is_error()) {
3200 bool temp
= var
->data
.read_only
;
3201 if (type
->qualifier
.flags
.q
.constant
)
3202 var
->data
.read_only
= false;
3204 /* Never emit code to initialize a uniform.
3206 const glsl_type
*initializer_type
;
3207 if (!type
->qualifier
.flags
.q
.uniform
) {
3208 do_assignment(initializer_instructions
, state
,
3213 type
->get_location());
3214 initializer_type
= result
->type
;
3216 initializer_type
= rhs
->type
;
3218 var
->constant_initializer
= rhs
->constant_expression_value();
3219 var
->data
.has_initializer
= true;
3221 /* If the declared variable is an unsized array, it must inherrit
3222 * its full type from the initializer. A declaration such as
3224 * uniform float a[] = float[](1.0, 2.0, 3.0, 3.0);
3228 * uniform float a[4] = float[](1.0, 2.0, 3.0, 3.0);
3230 * The assignment generated in the if-statement (below) will also
3231 * automatically handle this case for non-uniforms.
3233 * If the declared variable is not an array, the types must
3234 * already match exactly. As a result, the type assignment
3235 * here can be done unconditionally. For non-uniforms the call
3236 * to do_assignment can change the type of the initializer (via
3237 * the implicit conversion rules). For uniforms the initializer
3238 * must be a constant expression, and the type of that expression
3239 * was validated above.
3241 var
->type
= initializer_type
;
3243 var
->data
.read_only
= temp
;
3250 validate_layout_qualifier_vertex_count(struct _mesa_glsl_parse_state
*state
,
3251 YYLTYPE loc
, ir_variable
*var
,
3252 unsigned num_vertices
,
3254 const char *var_category
)
3256 if (var
->type
->is_unsized_array()) {
3257 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec says:
3259 * All geometry shader input unsized array declarations will be
3260 * sized by an earlier input layout qualifier, when present, as per
3261 * the following table.
3263 * Followed by a table mapping each allowed input layout qualifier to
3264 * the corresponding input length.
3266 * Similarly for tessellation control shader outputs.
3268 if (num_vertices
!= 0)
3269 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3272 /* Section 4.3.8.1 (Input Layout Qualifiers) of the GLSL 1.50 spec
3273 * includes the following examples of compile-time errors:
3275 * // code sequence within one shader...
3276 * in vec4 Color1[]; // size unknown
3277 * ...Color1.length()...// illegal, length() unknown
3278 * in vec4 Color2[2]; // size is 2
3279 * ...Color1.length()...// illegal, Color1 still has no size
3280 * in vec4 Color3[3]; // illegal, input sizes are inconsistent
3281 * layout(lines) in; // legal, input size is 2, matching
3282 * in vec4 Color4[3]; // illegal, contradicts layout
3285 * To detect the case illustrated by Color3, we verify that the size of
3286 * an explicitly-sized array matches the size of any previously declared
3287 * explicitly-sized array. To detect the case illustrated by Color4, we
3288 * verify that the size of an explicitly-sized array is consistent with
3289 * any previously declared input layout.
3291 if (num_vertices
!= 0 && var
->type
->length
!= num_vertices
) {
3292 _mesa_glsl_error(&loc
, state
,
3293 "%s size contradicts previously declared layout "
3294 "(size is %u, but layout requires a size of %u)",
3295 var_category
, var
->type
->length
, num_vertices
);
3296 } else if (*size
!= 0 && var
->type
->length
!= *size
) {
3297 _mesa_glsl_error(&loc
, state
,
3298 "%s sizes are inconsistent (size is %u, but a "
3299 "previous declaration has size %u)",
3300 var_category
, var
->type
->length
, *size
);
3302 *size
= var
->type
->length
;
3308 handle_tess_ctrl_shader_output_decl(struct _mesa_glsl_parse_state
*state
,
3309 YYLTYPE loc
, ir_variable
*var
)
3311 unsigned num_vertices
= 0;
3313 if (state
->tcs_output_vertices_specified
) {
3314 num_vertices
= state
->out_qualifier
->vertices
;
3317 if (!var
->type
->is_array() && !var
->data
.patch
) {
3318 _mesa_glsl_error(&loc
, state
,
3319 "tessellation control shader outputs must be arrays");
3321 /* To avoid cascading failures, short circuit the checks below. */
3325 if (var
->data
.patch
)
3328 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3329 &state
->tcs_output_size
,
3330 "tessellation control shader output");
3334 * Do additional processing necessary for tessellation control/evaluation shader
3335 * input declarations. This covers both interface block arrays and bare input
3339 handle_tess_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3340 YYLTYPE loc
, ir_variable
*var
)
3342 if (!var
->type
->is_array() && !var
->data
.patch
) {
3343 _mesa_glsl_error(&loc
, state
,
3344 "per-vertex tessellation shader inputs must be arrays");
3345 /* Avoid cascading failures. */
3349 if (var
->data
.patch
)
3352 /* Unsized arrays are implicitly sized to gl_MaxPatchVertices. */
3353 if (var
->type
->is_unsized_array()) {
3354 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
3355 state
->Const
.MaxPatchVertices
);
3361 * Do additional processing necessary for geometry shader input declarations
3362 * (this covers both interface blocks arrays and bare input variables).
3365 handle_geometry_shader_input_decl(struct _mesa_glsl_parse_state
*state
,
3366 YYLTYPE loc
, ir_variable
*var
)
3368 unsigned num_vertices
= 0;
3370 if (state
->gs_input_prim_type_specified
) {
3371 num_vertices
= vertices_per_prim(state
->in_qualifier
->prim_type
);
3374 /* Geometry shader input variables must be arrays. Caller should have
3375 * reported an error for this.
3377 if (!var
->type
->is_array()) {
3378 assert(state
->error
);
3380 /* To avoid cascading failures, short circuit the checks below. */
3384 validate_layout_qualifier_vertex_count(state
, loc
, var
, num_vertices
,
3385 &state
->gs_input_size
,
3386 "geometry shader input");
3390 validate_identifier(const char *identifier
, YYLTYPE loc
,
3391 struct _mesa_glsl_parse_state
*state
)
3393 /* From page 15 (page 21 of the PDF) of the GLSL 1.10 spec,
3395 * "Identifiers starting with "gl_" are reserved for use by
3396 * OpenGL, and may not be declared in a shader as either a
3397 * variable or a function."
3399 if (is_gl_identifier(identifier
)) {
3400 _mesa_glsl_error(&loc
, state
,
3401 "identifier `%s' uses reserved `gl_' prefix",
3403 } else if (strstr(identifier
, "__")) {
3404 /* From page 14 (page 20 of the PDF) of the GLSL 1.10
3407 * "In addition, all identifiers containing two
3408 * consecutive underscores (__) are reserved as
3409 * possible future keywords."
3411 * The intention is that names containing __ are reserved for internal
3412 * use by the implementation, and names prefixed with GL_ are reserved
3413 * for use by Khronos. Names simply containing __ are dangerous to use,
3414 * but should be allowed.
3416 * A future version of the GLSL specification will clarify this.
3418 _mesa_glsl_warning(&loc
, state
,
3419 "identifier `%s' uses reserved `__' string",
3425 precision_qualifier_allowed(const glsl_type
*type
)
3427 /* Precision qualifiers apply to floating point, integer and opaque
3430 * Section 4.5.2 (Precision Qualifiers) of the GLSL 1.30 spec says:
3431 * "Any floating point or any integer declaration can have the type
3432 * preceded by one of these precision qualifiers [...] Literal
3433 * constants do not have precision qualifiers. Neither do Boolean
3436 * Section 4.5 (Precision and Precision Qualifiers) of the GLSL 1.30
3439 * "Precision qualifiers are added for code portability with OpenGL
3440 * ES, not for functionality. They have the same syntax as in OpenGL
3443 * Section 8 (Built-In Functions) of the GLSL ES 1.00 spec says:
3445 * "uniform lowp sampler2D sampler;
3448 * lowp vec4 col = texture2D (sampler, coord);
3449 * // texture2D returns lowp"
3451 * From this, we infer that GLSL 1.30 (and later) should allow precision
3452 * qualifiers on sampler types just like float and integer types.
3454 return type
->is_float()
3455 || type
->is_integer()
3456 || type
->is_record()
3457 || type
->contains_opaque();
3461 ast_declarator_list::hir(exec_list
*instructions
,
3462 struct _mesa_glsl_parse_state
*state
)
3465 const struct glsl_type
*decl_type
;
3466 const char *type_name
= NULL
;
3467 ir_rvalue
*result
= NULL
;
3468 YYLTYPE loc
= this->get_location();
3470 /* From page 46 (page 52 of the PDF) of the GLSL 1.50 spec:
3472 * "To ensure that a particular output variable is invariant, it is
3473 * necessary to use the invariant qualifier. It can either be used to
3474 * qualify a previously declared variable as being invariant
3476 * invariant gl_Position; // make existing gl_Position be invariant"
3478 * In these cases the parser will set the 'invariant' flag in the declarator
3479 * list, and the type will be NULL.
3481 if (this->invariant
) {
3482 assert(this->type
== NULL
);
3484 if (state
->current_function
!= NULL
) {
3485 _mesa_glsl_error(& loc
, state
,
3486 "all uses of `invariant' keyword must be at global "
3490 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3491 assert(decl
->array_specifier
== NULL
);
3492 assert(decl
->initializer
== NULL
);
3494 ir_variable
*const earlier
=
3495 state
->symbols
->get_variable(decl
->identifier
);
3496 if (earlier
== NULL
) {
3497 _mesa_glsl_error(& loc
, state
,
3498 "undeclared variable `%s' cannot be marked "
3499 "invariant", decl
->identifier
);
3500 } else if (!is_varying_var(earlier
, state
->stage
)) {
3501 _mesa_glsl_error(&loc
, state
,
3502 "`%s' cannot be marked invariant; interfaces between "
3503 "shader stages only.", decl
->identifier
);
3504 } else if (earlier
->data
.used
) {
3505 _mesa_glsl_error(& loc
, state
,
3506 "variable `%s' may not be redeclared "
3507 "`invariant' after being used",
3510 earlier
->data
.invariant
= true;
3514 /* Invariant redeclarations do not have r-values.
3519 if (this->precise
) {
3520 assert(this->type
== NULL
);
3522 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3523 assert(decl
->array_specifier
== NULL
);
3524 assert(decl
->initializer
== NULL
);
3526 ir_variable
*const earlier
=
3527 state
->symbols
->get_variable(decl
->identifier
);
3528 if (earlier
== NULL
) {
3529 _mesa_glsl_error(& loc
, state
,
3530 "undeclared variable `%s' cannot be marked "
3531 "precise", decl
->identifier
);
3532 } else if (state
->current_function
!= NULL
&&
3533 !state
->symbols
->name_declared_this_scope(decl
->identifier
)) {
3534 /* Note: we have to check if we're in a function, since
3535 * builtins are treated as having come from another scope.
3537 _mesa_glsl_error(& loc
, state
,
3538 "variable `%s' from an outer scope may not be "
3539 "redeclared `precise' in this scope",
3541 } else if (earlier
->data
.used
) {
3542 _mesa_glsl_error(& loc
, state
,
3543 "variable `%s' may not be redeclared "
3544 "`precise' after being used",
3547 earlier
->data
.precise
= true;
3551 /* Precise redeclarations do not have r-values either. */
3555 assert(this->type
!= NULL
);
3556 assert(!this->invariant
);
3557 assert(!this->precise
);
3559 /* The type specifier may contain a structure definition. Process that
3560 * before any of the variable declarations.
3562 (void) this->type
->specifier
->hir(instructions
, state
);
3564 decl_type
= this->type
->glsl_type(& type_name
, state
);
3566 /* Section 4.3.7 "Buffer Variables" of the GLSL 4.30 spec:
3567 * "Buffer variables may only be declared inside interface blocks
3568 * (section 4.3.9 “Interface Blocks”), which are then referred to as
3569 * shader storage blocks. It is a compile-time error to declare buffer
3570 * variables at global scope (outside a block)."
3572 if (type
->qualifier
.flags
.q
.buffer
&& !decl_type
->is_interface()) {
3573 _mesa_glsl_error(&loc
, state
,
3574 "buffer variables cannot be declared outside "
3575 "interface blocks");
3578 /* An offset-qualified atomic counter declaration sets the default
3579 * offset for the next declaration within the same atomic counter
3582 if (decl_type
&& decl_type
->contains_atomic()) {
3583 if (type
->qualifier
.flags
.q
.explicit_binding
&&
3584 type
->qualifier
.flags
.q
.explicit_offset
)
3585 state
->atomic_counter_offsets
[type
->qualifier
.binding
] =
3586 type
->qualifier
.offset
;
3589 if (this->declarations
.is_empty()) {
3590 /* If there is no structure involved in the program text, there are two
3591 * possible scenarios:
3593 * - The program text contained something like 'vec4;'. This is an
3594 * empty declaration. It is valid but weird. Emit a warning.
3596 * - The program text contained something like 'S;' and 'S' is not the
3597 * name of a known structure type. This is both invalid and weird.
3600 * - The program text contained something like 'mediump float;'
3601 * when the programmer probably meant 'precision mediump
3602 * float;' Emit a warning with a description of what they
3603 * probably meant to do.
3605 * Note that if decl_type is NULL and there is a structure involved,
3606 * there must have been some sort of error with the structure. In this
3607 * case we assume that an error was already generated on this line of
3608 * code for the structure. There is no need to generate an additional,
3611 assert(this->type
->specifier
->structure
== NULL
|| decl_type
!= NULL
3614 if (decl_type
== NULL
) {
3615 _mesa_glsl_error(&loc
, state
,
3616 "invalid type `%s' in empty declaration",
3618 } else if (decl_type
->base_type
== GLSL_TYPE_ATOMIC_UINT
) {
3619 /* Empty atomic counter declarations are allowed and useful
3620 * to set the default offset qualifier.
3623 } else if (this->type
->qualifier
.precision
!= ast_precision_none
) {
3624 if (this->type
->specifier
->structure
!= NULL
) {
3625 _mesa_glsl_error(&loc
, state
,
3626 "precision qualifiers can't be applied "
3629 static const char *const precision_names
[] = {
3636 _mesa_glsl_warning(&loc
, state
,
3637 "empty declaration with precision qualifier, "
3638 "to set the default precision, use "
3639 "`precision %s %s;'",
3640 precision_names
[this->type
->qualifier
.precision
],
3643 } else if (this->type
->specifier
->structure
== NULL
) {
3644 _mesa_glsl_warning(&loc
, state
, "empty declaration");
3648 foreach_list_typed (ast_declaration
, decl
, link
, &this->declarations
) {
3649 const struct glsl_type
*var_type
;
3651 const char *identifier
= decl
->identifier
;
3652 /* FINISHME: Emit a warning if a variable declaration shadows a
3653 * FINISHME: declaration at a higher scope.
3656 if ((decl_type
== NULL
) || decl_type
->is_void()) {
3657 if (type_name
!= NULL
) {
3658 _mesa_glsl_error(& loc
, state
,
3659 "invalid type `%s' in declaration of `%s'",
3660 type_name
, decl
->identifier
);
3662 _mesa_glsl_error(& loc
, state
,
3663 "invalid type in declaration of `%s'",
3669 if (this->type
->qualifier
.flags
.q
.subroutine
) {
3673 t
= state
->symbols
->get_type(this->type
->specifier
->type_name
);
3675 _mesa_glsl_error(& loc
, state
,
3676 "invalid type in declaration of `%s'",
3678 name
= ralloc_asprintf(ctx
, "%s_%s", _mesa_shader_stage_to_subroutine_prefix(state
->stage
), decl
->identifier
);
3683 var_type
= process_array_type(&loc
, decl_type
, decl
->array_specifier
,
3686 var
= new(ctx
) ir_variable(var_type
, identifier
, ir_var_auto
);
3688 /* The 'varying in' and 'varying out' qualifiers can only be used with
3689 * ARB_geometry_shader4 and EXT_geometry_shader4, which we don't support
3692 if (this->type
->qualifier
.flags
.q
.varying
) {
3693 if (this->type
->qualifier
.flags
.q
.in
) {
3694 _mesa_glsl_error(& loc
, state
,
3695 "`varying in' qualifier in declaration of "
3696 "`%s' only valid for geometry shaders using "
3697 "ARB_geometry_shader4 or EXT_geometry_shader4",
3699 } else if (this->type
->qualifier
.flags
.q
.out
) {
3700 _mesa_glsl_error(& loc
, state
,
3701 "`varying out' qualifier in declaration of "
3702 "`%s' only valid for geometry shaders using "
3703 "ARB_geometry_shader4 or EXT_geometry_shader4",
3708 /* From page 22 (page 28 of the PDF) of the GLSL 1.10 specification;
3710 * "Global variables can only use the qualifiers const,
3711 * attribute, uniform, or varying. Only one may be
3714 * Local variables can only use the qualifier const."
3716 * This is relaxed in GLSL 1.30 and GLSL ES 3.00. It is also relaxed by
3717 * any extension that adds the 'layout' keyword.
3719 if (!state
->is_version(130, 300)
3720 && !state
->has_explicit_attrib_location()
3721 && !state
->has_separate_shader_objects()
3722 && !state
->ARB_fragment_coord_conventions_enable
) {
3723 if (this->type
->qualifier
.flags
.q
.out
) {
3724 _mesa_glsl_error(& loc
, state
,
3725 "`out' qualifier in declaration of `%s' "
3726 "only valid for function parameters in %s",
3727 decl
->identifier
, state
->get_version_string());
3729 if (this->type
->qualifier
.flags
.q
.in
) {
3730 _mesa_glsl_error(& loc
, state
,
3731 "`in' qualifier in declaration of `%s' "
3732 "only valid for function parameters in %s",
3733 decl
->identifier
, state
->get_version_string());
3735 /* FINISHME: Test for other invalid qualifiers. */
3738 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
,
3741 if (this->type
->qualifier
.flags
.q
.invariant
) {
3742 if (!is_varying_var(var
, state
->stage
)) {
3743 _mesa_glsl_error(&loc
, state
,
3744 "`%s' cannot be marked invariant; interfaces between "
3745 "shader stages only", var
->name
);
3749 if (state
->current_function
!= NULL
) {
3750 const char *mode
= NULL
;
3751 const char *extra
= "";
3753 /* There is no need to check for 'inout' here because the parser will
3754 * only allow that in function parameter lists.
3756 if (this->type
->qualifier
.flags
.q
.attribute
) {
3758 } else if (this->type
->qualifier
.flags
.q
.subroutine
) {
3759 mode
= "subroutine uniform";
3760 } else if (this->type
->qualifier
.flags
.q
.uniform
) {
3762 } else if (this->type
->qualifier
.flags
.q
.varying
) {
3764 } else if (this->type
->qualifier
.flags
.q
.in
) {
3766 extra
= " or in function parameter list";
3767 } else if (this->type
->qualifier
.flags
.q
.out
) {
3769 extra
= " or in function parameter list";
3773 _mesa_glsl_error(& loc
, state
,
3774 "%s variable `%s' must be declared at "
3776 mode
, var
->name
, extra
);
3778 } else if (var
->data
.mode
== ir_var_shader_in
) {
3779 var
->data
.read_only
= true;
3781 if (state
->stage
== MESA_SHADER_VERTEX
) {
3782 bool error_emitted
= false;
3784 /* From page 31 (page 37 of the PDF) of the GLSL 1.50 spec:
3786 * "Vertex shader inputs can only be float, floating-point
3787 * vectors, matrices, signed and unsigned integers and integer
3788 * vectors. Vertex shader inputs can also form arrays of these
3789 * types, but not structures."
3791 * From page 31 (page 27 of the PDF) of the GLSL 1.30 spec:
3793 * "Vertex shader inputs can only be float, floating-point
3794 * vectors, matrices, signed and unsigned integers and integer
3795 * vectors. They cannot be arrays or structures."
3797 * From page 23 (page 29 of the PDF) of the GLSL 1.20 spec:
3799 * "The attribute qualifier can be used only with float,
3800 * floating-point vectors, and matrices. Attribute variables
3801 * cannot be declared as arrays or structures."
3803 * From page 33 (page 39 of the PDF) of the GLSL ES 3.00 spec:
3805 * "Vertex shader inputs can only be float, floating-point
3806 * vectors, matrices, signed and unsigned integers and integer
3807 * vectors. Vertex shader inputs cannot be arrays or
3810 const glsl_type
*check_type
= var
->type
->without_array();
3812 switch (check_type
->base_type
) {
3813 case GLSL_TYPE_FLOAT
:
3815 case GLSL_TYPE_UINT
:
3817 if (state
->is_version(120, 300))
3819 case GLSL_TYPE_DOUBLE
:
3820 if (check_type
->base_type
== GLSL_TYPE_DOUBLE
&& (state
->is_version(410, 0) || state
->ARB_vertex_attrib_64bit_enable
))
3824 _mesa_glsl_error(& loc
, state
,
3825 "vertex shader input / attribute cannot have "
3827 var
->type
->is_array() ? "array of " : "",
3829 error_emitted
= true;
3832 if (!error_emitted
&& var
->type
->is_array() &&
3833 !state
->check_version(150, 0, &loc
,
3834 "vertex shader input / attribute "
3835 "cannot have array type")) {
3836 error_emitted
= true;
3838 } else if (state
->stage
== MESA_SHADER_GEOMETRY
) {
3839 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
3841 * Geometry shader input variables get the per-vertex values
3842 * written out by vertex shader output variables of the same
3843 * names. Since a geometry shader operates on a set of
3844 * vertices, each input varying variable (or input block, see
3845 * interface blocks below) needs to be declared as an array.
3847 if (!var
->type
->is_array()) {
3848 _mesa_glsl_error(&loc
, state
,
3849 "geometry shader inputs must be arrays");
3852 handle_geometry_shader_input_decl(state
, loc
, var
);
3853 } else if (state
->stage
== MESA_SHADER_FRAGMENT
) {
3854 /* From section 4.3.4 (Input Variables) of the GLSL ES 3.10 spec:
3856 * It is a compile-time error to declare a fragment shader
3857 * input with, or that contains, any of the following types:
3861 * * An array of arrays
3862 * * An array of structures
3863 * * A structure containing an array
3864 * * A structure containing a structure
3866 if (state
->es_shader
) {
3867 const glsl_type
*check_type
= var
->type
->without_array();
3868 if (check_type
->is_boolean() ||
3869 check_type
->contains_opaque()) {
3870 _mesa_glsl_error(&loc
, state
,
3871 "fragment shader input cannot have type %s",
3874 if (var
->type
->is_array() &&
3875 var
->type
->fields
.array
->is_array()) {
3876 _mesa_glsl_error(&loc
, state
,
3878 "cannot have an array of arrays",
3879 _mesa_shader_stage_to_string(state
->stage
));
3881 if (var
->type
->is_array() &&
3882 var
->type
->fields
.array
->is_record()) {
3883 _mesa_glsl_error(&loc
, state
,
3884 "fragment shader input "
3885 "cannot have an array of structs");
3887 if (var
->type
->is_record()) {
3888 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
3889 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
3890 var
->type
->fields
.structure
[i
].type
->is_record())
3891 _mesa_glsl_error(&loc
, state
,
3892 "fragement shader input cannot have "
3893 "a struct that contains an "
3898 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
||
3899 state
->stage
== MESA_SHADER_TESS_EVAL
) {
3900 handle_tess_shader_input_decl(state
, loc
, var
);
3902 } else if (var
->data
.mode
== ir_var_shader_out
) {
3903 const glsl_type
*check_type
= var
->type
->without_array();
3905 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
3907 * It is a compile-time error to declare a vertex, tessellation
3908 * evaluation, tessellation control, or geometry shader output
3909 * that contains any of the following:
3911 * * A Boolean type (bool, bvec2 ...)
3914 if (check_type
->is_boolean() || check_type
->contains_opaque())
3915 _mesa_glsl_error(&loc
, state
,
3916 "%s shader output cannot have type %s",
3917 _mesa_shader_stage_to_string(state
->stage
),
3920 /* From section 4.3.6 (Output variables) of the GLSL 4.40 spec:
3922 * It is a compile-time error to declare a fragment shader output
3923 * that contains any of the following:
3925 * * A Boolean type (bool, bvec2 ...)
3926 * * A double-precision scalar or vector (double, dvec2 ...)
3931 if (state
->stage
== MESA_SHADER_FRAGMENT
) {
3932 if (check_type
->is_record() || check_type
->is_matrix())
3933 _mesa_glsl_error(&loc
, state
,
3934 "fragment shader output "
3935 "cannot have struct or matrix type");
3936 switch (check_type
->base_type
) {
3937 case GLSL_TYPE_UINT
:
3939 case GLSL_TYPE_FLOAT
:
3942 _mesa_glsl_error(&loc
, state
,
3943 "fragment shader output cannot have "
3944 "type %s", check_type
->name
);
3948 /* From section 4.3.6 (Output Variables) of the GLSL ES 3.10 spec:
3950 * It is a compile-time error to declare a vertex shader output
3951 * with, or that contains, any of the following types:
3955 * * An array of arrays
3956 * * An array of structures
3957 * * A structure containing an array
3958 * * A structure containing a structure
3960 * It is a compile-time error to declare a fragment shader output
3961 * with, or that contains, any of the following types:
3967 * * An array of array
3969 if (state
->es_shader
) {
3970 if (var
->type
->is_array() &&
3971 var
->type
->fields
.array
->is_array()) {
3972 _mesa_glsl_error(&loc
, state
,
3974 "cannot have an array of arrays",
3975 _mesa_shader_stage_to_string(state
->stage
));
3977 if (state
->stage
== MESA_SHADER_VERTEX
) {
3978 if (var
->type
->is_array() &&
3979 var
->type
->fields
.array
->is_record()) {
3980 _mesa_glsl_error(&loc
, state
,
3981 "vertex shader output "
3982 "cannot have an array of structs");
3984 if (var
->type
->is_record()) {
3985 for (unsigned i
= 0; i
< var
->type
->length
; i
++) {
3986 if (var
->type
->fields
.structure
[i
].type
->is_array() ||
3987 var
->type
->fields
.structure
[i
].type
->is_record())
3988 _mesa_glsl_error(&loc
, state
,
3989 "vertex shader output cannot have a "
3990 "struct that contains an "
3997 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
3998 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
4000 } else if (var
->type
->contains_subroutine()) {
4001 /* declare subroutine uniforms as hidden */
4002 var
->data
.how_declared
= ir_var_hidden
;
4005 /* Integer fragment inputs must be qualified with 'flat'. In GLSL ES,
4006 * so must integer vertex outputs.
4008 * From section 4.3.4 ("Inputs") of the GLSL 1.50 spec:
4009 * "Fragment shader inputs that are signed or unsigned integers or
4010 * integer vectors must be qualified with the interpolation qualifier
4013 * From section 4.3.4 ("Input Variables") of the GLSL 3.00 ES spec:
4014 * "Fragment shader inputs that are, or contain, signed or unsigned
4015 * integers or integer vectors must be qualified with the
4016 * interpolation qualifier flat."
4018 * From section 4.3.6 ("Output Variables") of the GLSL 3.00 ES spec:
4019 * "Vertex shader outputs that are, or contain, signed or unsigned
4020 * integers or integer vectors must be qualified with the
4021 * interpolation qualifier flat."
4023 * Note that prior to GLSL 1.50, this requirement applied to vertex
4024 * outputs rather than fragment inputs. That creates problems in the
4025 * presence of geometry shaders, so we adopt the GLSL 1.50 rule for all
4026 * desktop GL shaders. For GLSL ES shaders, we follow the spec and
4027 * apply the restriction to both vertex outputs and fragment inputs.
4029 * Note also that the desktop GLSL specs are missing the text "or
4030 * contain"; this is presumably an oversight, since there is no
4031 * reasonable way to interpolate a fragment shader input that contains
4034 if (state
->is_version(130, 300) &&
4035 var
->type
->contains_integer() &&
4036 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4037 ((state
->stage
== MESA_SHADER_FRAGMENT
&& var
->data
.mode
== ir_var_shader_in
)
4038 || (state
->stage
== MESA_SHADER_VERTEX
&& var
->data
.mode
== ir_var_shader_out
4039 && state
->es_shader
))) {
4040 const char *var_type
= (state
->stage
== MESA_SHADER_VERTEX
) ?
4041 "vertex output" : "fragment input";
4042 _mesa_glsl_error(&loc
, state
, "if a %s is (or contains) "
4043 "an integer, then it must be qualified with 'flat'",
4047 /* Double fragment inputs must be qualified with 'flat'. */
4048 if (var
->type
->contains_double() &&
4049 var
->data
.interpolation
!= INTERP_QUALIFIER_FLAT
&&
4050 state
->stage
== MESA_SHADER_FRAGMENT
&&
4051 var
->data
.mode
== ir_var_shader_in
) {
4052 _mesa_glsl_error(&loc
, state
, "if a fragment input is (or contains) "
4053 "a double, then it must be qualified with 'flat'",
4057 /* Interpolation qualifiers cannot be applied to 'centroid' and
4058 * 'centroid varying'.
4060 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4061 * "interpolation qualifiers may only precede the qualifiers in,
4062 * centroid in, out, or centroid out in a declaration. They do not apply
4063 * to the deprecated storage qualifiers varying or centroid varying."
4065 * These deprecated storage qualifiers do not exist in GLSL ES 3.00.
4067 if (state
->is_version(130, 0)
4068 && this->type
->qualifier
.has_interpolation()
4069 && this->type
->qualifier
.flags
.q
.varying
) {
4071 const char *i
= this->type
->qualifier
.interpolation_string();
4074 if (this->type
->qualifier
.flags
.q
.centroid
)
4075 s
= "centroid varying";
4079 _mesa_glsl_error(&loc
, state
,
4080 "qualifier '%s' cannot be applied to the "
4081 "deprecated storage qualifier '%s'", i
, s
);
4085 /* Interpolation qualifiers can only apply to vertex shader outputs and
4086 * fragment shader inputs.
4088 * From page 29 (page 35 of the PDF) of the GLSL 1.30 spec:
4089 * "Outputs from a vertex shader (out) and inputs to a fragment
4090 * shader (in) can be further qualified with one or more of these
4091 * interpolation qualifiers"
4093 * From page 31 (page 37 of the PDF) of the GLSL ES 3.00 spec:
4094 * "These interpolation qualifiers may only precede the qualifiers
4095 * in, centroid in, out, or centroid out in a declaration. They do
4096 * not apply to inputs into a vertex shader or outputs from a
4099 if (state
->is_version(130, 300)
4100 && this->type
->qualifier
.has_interpolation()) {
4102 const char *i
= this->type
->qualifier
.interpolation_string();
4105 switch (state
->stage
) {
4106 case MESA_SHADER_VERTEX
:
4107 if (this->type
->qualifier
.flags
.q
.in
) {
4108 _mesa_glsl_error(&loc
, state
,
4109 "qualifier '%s' cannot be applied to vertex "
4110 "shader inputs", i
);
4113 case MESA_SHADER_FRAGMENT
:
4114 if (this->type
->qualifier
.flags
.q
.out
) {
4115 _mesa_glsl_error(&loc
, state
,
4116 "qualifier '%s' cannot be applied to fragment "
4117 "shader outputs", i
);
4126 /* From section 4.3.4 of the GLSL 4.00 spec:
4127 * "Input variables may not be declared using the patch in qualifier
4128 * in tessellation control or geometry shaders."
4130 * From section 4.3.6 of the GLSL 4.00 spec:
4131 * "It is an error to use patch out in a vertex, tessellation
4132 * evaluation, or geometry shader."
4134 * This doesn't explicitly forbid using them in a fragment shader, but
4135 * that's probably just an oversight.
4137 if (state
->stage
!= MESA_SHADER_TESS_EVAL
4138 && this->type
->qualifier
.flags
.q
.patch
4139 && this->type
->qualifier
.flags
.q
.in
) {
4141 _mesa_glsl_error(&loc
, state
, "'patch in' can only be used in a "
4142 "tessellation evaluation shader");
4145 if (state
->stage
!= MESA_SHADER_TESS_CTRL
4146 && this->type
->qualifier
.flags
.q
.patch
4147 && this->type
->qualifier
.flags
.q
.out
) {
4149 _mesa_glsl_error(&loc
, state
, "'patch out' can only be used in a "
4150 "tessellation control shader");
4153 /* Precision qualifiers exists only in GLSL versions 1.00 and >= 1.30.
4155 if (this->type
->qualifier
.precision
!= ast_precision_none
) {
4156 state
->check_precision_qualifiers_allowed(&loc
);
4160 /* If a precision qualifier is allowed on a type, it is allowed on
4161 * an array of that type.
4163 if (!(this->type
->qualifier
.precision
== ast_precision_none
4164 || precision_qualifier_allowed(var
->type
->without_array()))) {
4166 _mesa_glsl_error(&loc
, state
,
4167 "precision qualifiers apply only to floating point"
4168 ", integer and opaque types");
4171 /* From section 4.1.7 of the GLSL 4.40 spec:
4173 * "[Opaque types] can only be declared as function
4174 * parameters or uniform-qualified variables."
4176 if (var_type
->contains_opaque() &&
4177 !this->type
->qualifier
.flags
.q
.uniform
) {
4178 _mesa_glsl_error(&loc
, state
,
4179 "opaque variables must be declared uniform");
4182 /* Process the initializer and add its instructions to a temporary
4183 * list. This list will be added to the instruction stream (below) after
4184 * the declaration is added. This is done because in some cases (such as
4185 * redeclarations) the declaration may not actually be added to the
4186 * instruction stream.
4188 exec_list initializer_instructions
;
4190 /* Examine var name here since var may get deleted in the next call */
4191 bool var_is_gl_id
= is_gl_identifier(var
->name
);
4193 ir_variable
*earlier
=
4194 get_variable_being_redeclared(var
, decl
->get_location(), state
,
4195 false /* allow_all_redeclarations */);
4196 if (earlier
!= NULL
) {
4198 earlier
->data
.how_declared
== ir_var_declared_in_block
) {
4199 _mesa_glsl_error(&loc
, state
,
4200 "`%s' has already been redeclared using "
4201 "gl_PerVertex", earlier
->name
);
4203 earlier
->data
.how_declared
= ir_var_declared_normally
;
4206 if (decl
->initializer
!= NULL
) {
4207 result
= process_initializer((earlier
== NULL
) ? var
: earlier
,
4209 &initializer_instructions
, state
);
4212 /* From page 23 (page 29 of the PDF) of the GLSL 1.10 spec:
4214 * "It is an error to write to a const variable outside of
4215 * its declaration, so they must be initialized when
4218 if (this->type
->qualifier
.flags
.q
.constant
&& decl
->initializer
== NULL
) {
4219 _mesa_glsl_error(& loc
, state
,
4220 "const declaration of `%s' must be initialized",
4224 if (state
->es_shader
) {
4225 const glsl_type
*const t
= (earlier
== NULL
)
4226 ? var
->type
: earlier
->type
;
4228 if (t
->is_unsized_array())
4229 /* Section 10.17 of the GLSL ES 1.00 specification states that
4230 * unsized array declarations have been removed from the language.
4231 * Arrays that are sized using an initializer are still explicitly
4232 * sized. However, GLSL ES 1.00 does not allow array
4233 * initializers. That is only allowed in GLSL ES 3.00.
4235 * Section 4.1.9 (Arrays) of the GLSL ES 3.00 spec says:
4237 * "An array type can also be formed without specifying a size
4238 * if the definition includes an initializer:
4240 * float x[] = float[2] (1.0, 2.0); // declares an array of size 2
4241 * float y[] = float[] (1.0, 2.0, 3.0); // declares an array of size 3
4246 _mesa_glsl_error(& loc
, state
,
4247 "unsized array declarations are not allowed in "
4251 /* If the declaration is not a redeclaration, there are a few additional
4252 * semantic checks that must be applied. In addition, variable that was
4253 * created for the declaration should be added to the IR stream.
4255 if (earlier
== NULL
) {
4256 validate_identifier(decl
->identifier
, loc
, state
);
4258 /* Add the variable to the symbol table. Note that the initializer's
4259 * IR was already processed earlier (though it hasn't been emitted
4260 * yet), without the variable in scope.
4262 * This differs from most C-like languages, but it follows the GLSL
4263 * specification. From page 28 (page 34 of the PDF) of the GLSL 1.50
4266 * "Within a declaration, the scope of a name starts immediately
4267 * after the initializer if present or immediately after the name
4268 * being declared if not."
4270 if (!state
->symbols
->add_variable(var
)) {
4271 YYLTYPE loc
= this->get_location();
4272 _mesa_glsl_error(&loc
, state
, "name `%s' already taken in the "
4273 "current scope", decl
->identifier
);
4277 /* Push the variable declaration to the top. It means that all the
4278 * variable declarations will appear in a funny last-to-first order,
4279 * but otherwise we run into trouble if a function is prototyped, a
4280 * global var is decled, then the function is defined with usage of
4281 * the global var. See glslparsertest's CorrectModule.frag.
4283 instructions
->push_head(var
);
4286 instructions
->append_list(&initializer_instructions
);
4290 /* Generally, variable declarations do not have r-values. However,
4291 * one is used for the declaration in
4293 * while (bool b = some_condition()) {
4297 * so we return the rvalue from the last seen declaration here.
4304 ast_parameter_declarator::hir(exec_list
*instructions
,
4305 struct _mesa_glsl_parse_state
*state
)
4308 const struct glsl_type
*type
;
4309 const char *name
= NULL
;
4310 YYLTYPE loc
= this->get_location();
4312 type
= this->type
->glsl_type(& name
, state
);
4316 _mesa_glsl_error(& loc
, state
,
4317 "invalid type `%s' in declaration of `%s'",
4318 name
, this->identifier
);
4320 _mesa_glsl_error(& loc
, state
,
4321 "invalid type in declaration of `%s'",
4325 type
= glsl_type::error_type
;
4328 /* From page 62 (page 68 of the PDF) of the GLSL 1.50 spec:
4330 * "Functions that accept no input arguments need not use void in the
4331 * argument list because prototypes (or definitions) are required and
4332 * therefore there is no ambiguity when an empty argument list "( )" is
4333 * declared. The idiom "(void)" as a parameter list is provided for
4336 * Placing this check here prevents a void parameter being set up
4337 * for a function, which avoids tripping up checks for main taking
4338 * parameters and lookups of an unnamed symbol.
4340 if (type
->is_void()) {
4341 if (this->identifier
!= NULL
)
4342 _mesa_glsl_error(& loc
, state
,
4343 "named parameter cannot have type `void'");
4349 if (formal_parameter
&& (this->identifier
== NULL
)) {
4350 _mesa_glsl_error(& loc
, state
, "formal parameter lacks a name");
4354 /* This only handles "vec4 foo[..]". The earlier specifier->glsl_type(...)
4355 * call already handled the "vec4[..] foo" case.
4357 type
= process_array_type(&loc
, type
, this->array_specifier
, state
);
4359 if (!type
->is_error() && type
->is_unsized_array()) {
4360 _mesa_glsl_error(&loc
, state
, "arrays passed as parameters must have "
4362 type
= glsl_type::error_type
;
4366 ir_variable
*var
= new(ctx
)
4367 ir_variable(type
, this->identifier
, ir_var_function_in
);
4369 /* Apply any specified qualifiers to the parameter declaration. Note that
4370 * for function parameters the default mode is 'in'.
4372 apply_type_qualifier_to_variable(& this->type
->qualifier
, var
, state
, & loc
,
4375 /* From section 4.1.7 of the GLSL 4.40 spec:
4377 * "Opaque variables cannot be treated as l-values; hence cannot
4378 * be used as out or inout function parameters, nor can they be
4381 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4382 && type
->contains_opaque()) {
4383 _mesa_glsl_error(&loc
, state
, "out and inout parameters cannot "
4384 "contain opaque variables");
4385 type
= glsl_type::error_type
;
4388 /* From page 39 (page 45 of the PDF) of the GLSL 1.10 spec:
4390 * "When calling a function, expressions that do not evaluate to
4391 * l-values cannot be passed to parameters declared as out or inout."
4393 * From page 32 (page 38 of the PDF) of the GLSL 1.10 spec:
4395 * "Other binary or unary expressions, non-dereferenced arrays,
4396 * function names, swizzles with repeated fields, and constants
4397 * cannot be l-values."
4399 * So for GLSL 1.10, passing an array as an out or inout parameter is not
4400 * allowed. This restriction is removed in GLSL 1.20, and in GLSL ES.
4402 if ((var
->data
.mode
== ir_var_function_inout
|| var
->data
.mode
== ir_var_function_out
)
4404 && !state
->check_version(120, 100, &loc
,
4405 "arrays cannot be out or inout parameters")) {
4406 type
= glsl_type::error_type
;
4409 instructions
->push_tail(var
);
4411 /* Parameter declarations do not have r-values.
4418 ast_parameter_declarator::parameters_to_hir(exec_list
*ast_parameters
,
4420 exec_list
*ir_parameters
,
4421 _mesa_glsl_parse_state
*state
)
4423 ast_parameter_declarator
*void_param
= NULL
;
4426 foreach_list_typed (ast_parameter_declarator
, param
, link
, ast_parameters
) {
4427 param
->formal_parameter
= formal
;
4428 param
->hir(ir_parameters
, state
);
4436 if ((void_param
!= NULL
) && (count
> 1)) {
4437 YYLTYPE loc
= void_param
->get_location();
4439 _mesa_glsl_error(& loc
, state
,
4440 "`void' parameter must be only parameter");
4446 emit_function(_mesa_glsl_parse_state
*state
, ir_function
*f
)
4448 /* IR invariants disallow function declarations or definitions
4449 * nested within other function definitions. But there is no
4450 * requirement about the relative order of function declarations
4451 * and definitions with respect to one another. So simply insert
4452 * the new ir_function block at the end of the toplevel instruction
4455 state
->toplevel_ir
->push_tail(f
);
4460 ast_function::hir(exec_list
*instructions
,
4461 struct _mesa_glsl_parse_state
*state
)
4464 ir_function
*f
= NULL
;
4465 ir_function_signature
*sig
= NULL
;
4466 exec_list hir_parameters
;
4467 YYLTYPE loc
= this->get_location();
4469 const char *const name
= identifier
;
4471 /* New functions are always added to the top-level IR instruction stream,
4472 * so this instruction list pointer is ignored. See also emit_function
4475 (void) instructions
;
4477 /* From page 21 (page 27 of the PDF) of the GLSL 1.20 spec,
4479 * "Function declarations (prototypes) cannot occur inside of functions;
4480 * they must be at global scope, or for the built-in functions, outside
4481 * the global scope."
4483 * From page 27 (page 33 of the PDF) of the GLSL ES 1.00.16 spec,
4485 * "User defined functions may only be defined within the global scope."
4487 * Note that this language does not appear in GLSL 1.10.
4489 if ((state
->current_function
!= NULL
) &&
4490 state
->is_version(120, 100)) {
4491 YYLTYPE loc
= this->get_location();
4492 _mesa_glsl_error(&loc
, state
,
4493 "declaration of function `%s' not allowed within "
4494 "function body", name
);
4497 validate_identifier(name
, this->get_location(), state
);
4499 /* Convert the list of function parameters to HIR now so that they can be
4500 * used below to compare this function's signature with previously seen
4501 * signatures for functions with the same name.
4503 ast_parameter_declarator::parameters_to_hir(& this->parameters
,
4505 & hir_parameters
, state
);
4507 const char *return_type_name
;
4508 const glsl_type
*return_type
=
4509 this->return_type
->glsl_type(& return_type_name
, state
);
4512 YYLTYPE loc
= this->get_location();
4513 _mesa_glsl_error(&loc
, state
,
4514 "function `%s' has undeclared return type `%s'",
4515 name
, return_type_name
);
4516 return_type
= glsl_type::error_type
;
4519 /* ARB_shader_subroutine states:
4520 * "Subroutine declarations cannot be prototyped. It is an error to prepend
4521 * subroutine(...) to a function declaration."
4523 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
&& !is_definition
) {
4524 YYLTYPE loc
= this->get_location();
4525 _mesa_glsl_error(&loc
, state
,
4526 "function declaration `%s' cannot have subroutine prepended",
4530 /* From page 56 (page 62 of the PDF) of the GLSL 1.30 spec:
4531 * "No qualifier is allowed on the return type of a function."
4533 if (this->return_type
->has_qualifiers()) {
4534 YYLTYPE loc
= this->get_location();
4535 _mesa_glsl_error(& loc
, state
,
4536 "function `%s' return type has qualifiers", name
);
4539 /* Section 6.1 (Function Definitions) of the GLSL 1.20 spec says:
4541 * "Arrays are allowed as arguments and as the return type. In both
4542 * cases, the array must be explicitly sized."
4544 if (return_type
->is_unsized_array()) {
4545 YYLTYPE loc
= this->get_location();
4546 _mesa_glsl_error(& loc
, state
,
4547 "function `%s' return type array must be explicitly "
4551 /* From section 4.1.7 of the GLSL 4.40 spec:
4553 * "[Opaque types] can only be declared as function parameters
4554 * or uniform-qualified variables."
4556 if (return_type
->contains_opaque()) {
4557 YYLTYPE loc
= this->get_location();
4558 _mesa_glsl_error(&loc
, state
,
4559 "function `%s' return type can't contain an opaque type",
4563 /* Create an ir_function if one doesn't already exist. */
4564 f
= state
->symbols
->get_function(name
);
4566 f
= new(ctx
) ir_function(name
);
4567 if (!this->return_type
->qualifier
.flags
.q
.subroutine
) {
4568 if (!state
->symbols
->add_function(f
)) {
4569 /* This function name shadows a non-function use of the same name. */
4570 YYLTYPE loc
= this->get_location();
4571 _mesa_glsl_error(&loc
, state
, "function name `%s' conflicts with "
4572 "non-function", name
);
4576 emit_function(state
, f
);
4579 /* From GLSL ES 3.0 spec, chapter 6.1 "Function Definitions", page 71:
4581 * "A shader cannot redefine or overload built-in functions."
4583 * While in GLSL ES 1.0 specification, chapter 8 "Built-in Functions":
4585 * "User code can overload the built-in functions but cannot redefine
4588 if (state
->es_shader
&& state
->language_version
>= 300) {
4589 /* Local shader has no exact candidates; check the built-ins. */
4590 _mesa_glsl_initialize_builtin_functions();
4591 if (_mesa_glsl_find_builtin_function_by_name(state
, name
)) {
4592 YYLTYPE loc
= this->get_location();
4593 _mesa_glsl_error(& loc
, state
,
4594 "A shader cannot redefine or overload built-in "
4595 "function `%s' in GLSL ES 3.00", name
);
4600 /* Verify that this function's signature either doesn't match a previously
4601 * seen signature for a function with the same name, or, if a match is found,
4602 * that the previously seen signature does not have an associated definition.
4604 if (state
->es_shader
|| f
->has_user_signature()) {
4605 sig
= f
->exact_matching_signature(state
, &hir_parameters
);
4607 const char *badvar
= sig
->qualifiers_match(&hir_parameters
);
4608 if (badvar
!= NULL
) {
4609 YYLTYPE loc
= this->get_location();
4611 _mesa_glsl_error(&loc
, state
, "function `%s' parameter `%s' "
4612 "qualifiers don't match prototype", name
, badvar
);
4615 if (sig
->return_type
!= return_type
) {
4616 YYLTYPE loc
= this->get_location();
4618 _mesa_glsl_error(&loc
, state
, "function `%s' return type doesn't "
4619 "match prototype", name
);
4622 if (sig
->is_defined
) {
4623 if (is_definition
) {
4624 YYLTYPE loc
= this->get_location();
4625 _mesa_glsl_error(& loc
, state
, "function `%s' redefined", name
);
4627 /* We just encountered a prototype that exactly matches a
4628 * function that's already been defined. This is redundant,
4629 * and we should ignore it.
4637 /* Verify the return type of main() */
4638 if (strcmp(name
, "main") == 0) {
4639 if (! return_type
->is_void()) {
4640 YYLTYPE loc
= this->get_location();
4642 _mesa_glsl_error(& loc
, state
, "main() must return void");
4645 if (!hir_parameters
.is_empty()) {
4646 YYLTYPE loc
= this->get_location();
4648 _mesa_glsl_error(& loc
, state
, "main() must not take any parameters");
4652 /* Finish storing the information about this new function in its signature.
4655 sig
= new(ctx
) ir_function_signature(return_type
);
4656 f
->add_signature(sig
);
4659 sig
->replace_parameters(&hir_parameters
);
4662 if (this->return_type
->qualifier
.flags
.q
.subroutine_def
) {
4665 f
->num_subroutine_types
= this->return_type
->qualifier
.subroutine_list
->declarations
.length();
4666 f
->subroutine_types
= ralloc_array(state
, const struct glsl_type
*,
4667 f
->num_subroutine_types
);
4669 foreach_list_typed(ast_declaration
, decl
, link
, &this->return_type
->qualifier
.subroutine_list
->declarations
) {
4670 const struct glsl_type
*type
;
4671 /* the subroutine type must be already declared */
4672 type
= state
->symbols
->get_type(decl
->identifier
);
4674 _mesa_glsl_error(& loc
, state
, "unknown type '%s' in subroutine function definition", decl
->identifier
);
4676 f
->subroutine_types
[idx
++] = type
;
4678 state
->subroutines
= (ir_function
**)reralloc(state
, state
->subroutines
,
4680 state
->num_subroutines
+ 1);
4681 state
->subroutines
[state
->num_subroutines
] = f
;
4682 state
->num_subroutines
++;
4686 if (this->return_type
->qualifier
.flags
.q
.subroutine
) {
4687 if (!state
->symbols
->add_type(this->identifier
, glsl_type::get_subroutine_instance(this->identifier
))) {
4688 _mesa_glsl_error(& loc
, state
, "type '%s' previously defined", this->identifier
);
4691 state
->subroutine_types
= (ir_function
**)reralloc(state
, state
->subroutine_types
,
4693 state
->num_subroutine_types
+ 1);
4694 state
->subroutine_types
[state
->num_subroutine_types
] = f
;
4695 state
->num_subroutine_types
++;
4697 f
->is_subroutine
= true;
4700 /* Function declarations (prototypes) do not have r-values.
4707 ast_function_definition::hir(exec_list
*instructions
,
4708 struct _mesa_glsl_parse_state
*state
)
4710 prototype
->is_definition
= true;
4711 prototype
->hir(instructions
, state
);
4713 ir_function_signature
*signature
= prototype
->signature
;
4714 if (signature
== NULL
)
4717 assert(state
->current_function
== NULL
);
4718 state
->current_function
= signature
;
4719 state
->found_return
= false;
4721 /* Duplicate parameters declared in the prototype as concrete variables.
4722 * Add these to the symbol table.
4724 state
->symbols
->push_scope();
4725 foreach_in_list(ir_variable
, var
, &signature
->parameters
) {
4726 assert(var
->as_variable() != NULL
);
4728 /* The only way a parameter would "exist" is if two parameters have
4731 if (state
->symbols
->name_declared_this_scope(var
->name
)) {
4732 YYLTYPE loc
= this->get_location();
4734 _mesa_glsl_error(& loc
, state
, "parameter `%s' redeclared", var
->name
);
4736 state
->symbols
->add_variable(var
);
4740 /* Convert the body of the function to HIR. */
4741 this->body
->hir(&signature
->body
, state
);
4742 signature
->is_defined
= true;
4744 state
->symbols
->pop_scope();
4746 assert(state
->current_function
== signature
);
4747 state
->current_function
= NULL
;
4749 if (!signature
->return_type
->is_void() && !state
->found_return
) {
4750 YYLTYPE loc
= this->get_location();
4751 _mesa_glsl_error(& loc
, state
, "function `%s' has non-void return type "
4752 "%s, but no return statement",
4753 signature
->function_name(),
4754 signature
->return_type
->name
);
4757 /* Function definitions do not have r-values.
4764 ast_jump_statement::hir(exec_list
*instructions
,
4765 struct _mesa_glsl_parse_state
*state
)
4772 assert(state
->current_function
);
4774 if (opt_return_value
) {
4775 ir_rvalue
*ret
= opt_return_value
->hir(instructions
, state
);
4777 /* The value of the return type can be NULL if the shader says
4778 * 'return foo();' and foo() is a function that returns void.
4780 * NOTE: The GLSL spec doesn't say that this is an error. The type
4781 * of the return value is void. If the return type of the function is
4782 * also void, then this should compile without error. Seriously.
4784 const glsl_type
*const ret_type
=
4785 (ret
== NULL
) ? glsl_type::void_type
: ret
->type
;
4787 /* Implicit conversions are not allowed for return values prior to
4788 * ARB_shading_language_420pack.
4790 if (state
->current_function
->return_type
!= ret_type
) {
4791 YYLTYPE loc
= this->get_location();
4793 if (state
->ARB_shading_language_420pack_enable
) {
4794 if (!apply_implicit_conversion(state
->current_function
->return_type
,
4796 _mesa_glsl_error(& loc
, state
,
4797 "could not implicitly convert return value "
4798 "to %s, in function `%s'",
4799 state
->current_function
->return_type
->name
,
4800 state
->current_function
->function_name());
4803 _mesa_glsl_error(& loc
, state
,
4804 "`return' with wrong type %s, in function `%s' "
4807 state
->current_function
->function_name(),
4808 state
->current_function
->return_type
->name
);
4810 } else if (state
->current_function
->return_type
->base_type
==
4812 YYLTYPE loc
= this->get_location();
4814 /* The ARB_shading_language_420pack, GLSL ES 3.0, and GLSL 4.20
4815 * specs add a clarification:
4817 * "A void function can only use return without a return argument, even if
4818 * the return argument has void type. Return statements only accept values:
4821 * void func2() { return func1(); } // illegal return statement"
4823 _mesa_glsl_error(& loc
, state
,
4824 "void functions can only use `return' without a "
4828 inst
= new(ctx
) ir_return(ret
);
4830 if (state
->current_function
->return_type
->base_type
!=
4832 YYLTYPE loc
= this->get_location();
4834 _mesa_glsl_error(& loc
, state
,
4835 "`return' with no value, in function %s returning "
4837 state
->current_function
->function_name());
4839 inst
= new(ctx
) ir_return
;
4842 state
->found_return
= true;
4843 instructions
->push_tail(inst
);
4848 if (state
->stage
!= MESA_SHADER_FRAGMENT
) {
4849 YYLTYPE loc
= this->get_location();
4851 _mesa_glsl_error(& loc
, state
,
4852 "`discard' may only appear in a fragment shader");
4854 instructions
->push_tail(new(ctx
) ir_discard
);
4859 if (mode
== ast_continue
&&
4860 state
->loop_nesting_ast
== NULL
) {
4861 YYLTYPE loc
= this->get_location();
4863 _mesa_glsl_error(& loc
, state
, "continue may only appear in a loop");
4864 } else if (mode
== ast_break
&&
4865 state
->loop_nesting_ast
== NULL
&&
4866 state
->switch_state
.switch_nesting_ast
== NULL
) {
4867 YYLTYPE loc
= this->get_location();
4869 _mesa_glsl_error(& loc
, state
,
4870 "break may only appear in a loop or a switch");
4872 /* For a loop, inline the for loop expression again, since we don't
4873 * know where near the end of the loop body the normal copy of it is
4874 * going to be placed. Same goes for the condition for a do-while
4877 if (state
->loop_nesting_ast
!= NULL
&&
4878 mode
== ast_continue
&& !state
->switch_state
.is_switch_innermost
) {
4879 if (state
->loop_nesting_ast
->rest_expression
) {
4880 state
->loop_nesting_ast
->rest_expression
->hir(instructions
,
4883 if (state
->loop_nesting_ast
->mode
==
4884 ast_iteration_statement::ast_do_while
) {
4885 state
->loop_nesting_ast
->condition_to_hir(instructions
, state
);
4889 if (state
->switch_state
.is_switch_innermost
&&
4890 mode
== ast_continue
) {
4891 /* Set 'continue_inside' to true. */
4892 ir_rvalue
*const true_val
= new (ctx
) ir_constant(true);
4893 ir_dereference_variable
*deref_continue_inside_var
=
4894 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
4895 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
4898 /* Break out from the switch, continue for the loop will
4899 * be called right after switch. */
4900 ir_loop_jump
*const jump
=
4901 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4902 instructions
->push_tail(jump
);
4904 } else if (state
->switch_state
.is_switch_innermost
&&
4905 mode
== ast_break
) {
4906 /* Force break out of switch by inserting a break. */
4907 ir_loop_jump
*const jump
=
4908 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
4909 instructions
->push_tail(jump
);
4911 ir_loop_jump
*const jump
=
4912 new(ctx
) ir_loop_jump((mode
== ast_break
)
4913 ? ir_loop_jump::jump_break
4914 : ir_loop_jump::jump_continue
);
4915 instructions
->push_tail(jump
);
4922 /* Jump instructions do not have r-values.
4929 ast_selection_statement::hir(exec_list
*instructions
,
4930 struct _mesa_glsl_parse_state
*state
)
4934 ir_rvalue
*const condition
= this->condition
->hir(instructions
, state
);
4936 /* From page 66 (page 72 of the PDF) of the GLSL 1.50 spec:
4938 * "Any expression whose type evaluates to a Boolean can be used as the
4939 * conditional expression bool-expression. Vector types are not accepted
4940 * as the expression to if."
4942 * The checks are separated so that higher quality diagnostics can be
4943 * generated for cases where both rules are violated.
4945 if (!condition
->type
->is_boolean() || !condition
->type
->is_scalar()) {
4946 YYLTYPE loc
= this->condition
->get_location();
4948 _mesa_glsl_error(& loc
, state
, "if-statement condition must be scalar "
4952 ir_if
*const stmt
= new(ctx
) ir_if(condition
);
4954 if (then_statement
!= NULL
) {
4955 state
->symbols
->push_scope();
4956 then_statement
->hir(& stmt
->then_instructions
, state
);
4957 state
->symbols
->pop_scope();
4960 if (else_statement
!= NULL
) {
4961 state
->symbols
->push_scope();
4962 else_statement
->hir(& stmt
->else_instructions
, state
);
4963 state
->symbols
->pop_scope();
4966 instructions
->push_tail(stmt
);
4968 /* if-statements do not have r-values.
4975 ast_switch_statement::hir(exec_list
*instructions
,
4976 struct _mesa_glsl_parse_state
*state
)
4980 ir_rvalue
*const test_expression
=
4981 this->test_expression
->hir(instructions
, state
);
4983 /* From page 66 (page 55 of the PDF) of the GLSL 1.50 spec:
4985 * "The type of init-expression in a switch statement must be a
4988 if (!test_expression
->type
->is_scalar() ||
4989 !test_expression
->type
->is_integer()) {
4990 YYLTYPE loc
= this->test_expression
->get_location();
4992 _mesa_glsl_error(& loc
,
4994 "switch-statement expression must be scalar "
4998 /* Track the switch-statement nesting in a stack-like manner.
5000 struct glsl_switch_state saved
= state
->switch_state
;
5002 state
->switch_state
.is_switch_innermost
= true;
5003 state
->switch_state
.switch_nesting_ast
= this;
5004 state
->switch_state
.labels_ht
= hash_table_ctor(0, hash_table_pointer_hash
,
5005 hash_table_pointer_compare
);
5006 state
->switch_state
.previous_default
= NULL
;
5008 /* Initalize is_fallthru state to false.
5010 ir_rvalue
*const is_fallthru_val
= new (ctx
) ir_constant(false);
5011 state
->switch_state
.is_fallthru_var
=
5012 new(ctx
) ir_variable(glsl_type::bool_type
,
5013 "switch_is_fallthru_tmp",
5015 instructions
->push_tail(state
->switch_state
.is_fallthru_var
);
5017 ir_dereference_variable
*deref_is_fallthru_var
=
5018 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5019 instructions
->push_tail(new(ctx
) ir_assignment(deref_is_fallthru_var
,
5022 /* Initialize continue_inside state to false.
5024 state
->switch_state
.continue_inside
=
5025 new(ctx
) ir_variable(glsl_type::bool_type
,
5026 "continue_inside_tmp",
5028 instructions
->push_tail(state
->switch_state
.continue_inside
);
5030 ir_rvalue
*const false_val
= new (ctx
) ir_constant(false);
5031 ir_dereference_variable
*deref_continue_inside_var
=
5032 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5033 instructions
->push_tail(new(ctx
) ir_assignment(deref_continue_inside_var
,
5036 state
->switch_state
.run_default
=
5037 new(ctx
) ir_variable(glsl_type::bool_type
,
5040 instructions
->push_tail(state
->switch_state
.run_default
);
5042 /* Loop around the switch is used for flow control. */
5043 ir_loop
* loop
= new(ctx
) ir_loop();
5044 instructions
->push_tail(loop
);
5046 /* Cache test expression.
5048 test_to_hir(&loop
->body_instructions
, state
);
5050 /* Emit code for body of switch stmt.
5052 body
->hir(&loop
->body_instructions
, state
);
5054 /* Insert a break at the end to exit loop. */
5055 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5056 loop
->body_instructions
.push_tail(jump
);
5058 /* If we are inside loop, check if continue got called inside switch. */
5059 if (state
->loop_nesting_ast
!= NULL
) {
5060 ir_dereference_variable
*deref_continue_inside
=
5061 new(ctx
) ir_dereference_variable(state
->switch_state
.continue_inside
);
5062 ir_if
*irif
= new(ctx
) ir_if(deref_continue_inside
);
5063 ir_loop_jump
*jump
= new(ctx
) ir_loop_jump(ir_loop_jump::jump_continue
);
5065 if (state
->loop_nesting_ast
!= NULL
) {
5066 if (state
->loop_nesting_ast
->rest_expression
) {
5067 state
->loop_nesting_ast
->rest_expression
->hir(&irif
->then_instructions
,
5070 if (state
->loop_nesting_ast
->mode
==
5071 ast_iteration_statement::ast_do_while
) {
5072 state
->loop_nesting_ast
->condition_to_hir(&irif
->then_instructions
, state
);
5075 irif
->then_instructions
.push_tail(jump
);
5076 instructions
->push_tail(irif
);
5079 hash_table_dtor(state
->switch_state
.labels_ht
);
5081 state
->switch_state
= saved
;
5083 /* Switch statements do not have r-values. */
5089 ast_switch_statement::test_to_hir(exec_list
*instructions
,
5090 struct _mesa_glsl_parse_state
*state
)
5094 /* Cache value of test expression. */
5095 ir_rvalue
*const test_val
=
5096 test_expression
->hir(instructions
,
5099 state
->switch_state
.test_var
= new(ctx
) ir_variable(test_val
->type
,
5102 ir_dereference_variable
*deref_test_var
=
5103 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5105 instructions
->push_tail(state
->switch_state
.test_var
);
5106 instructions
->push_tail(new(ctx
) ir_assignment(deref_test_var
, test_val
));
5111 ast_switch_body::hir(exec_list
*instructions
,
5112 struct _mesa_glsl_parse_state
*state
)
5115 stmts
->hir(instructions
, state
);
5117 /* Switch bodies do not have r-values. */
5122 ast_case_statement_list::hir(exec_list
*instructions
,
5123 struct _mesa_glsl_parse_state
*state
)
5125 exec_list default_case
, after_default
, tmp
;
5127 foreach_list_typed (ast_case_statement
, case_stmt
, link
, & this->cases
) {
5128 case_stmt
->hir(&tmp
, state
);
5131 if (state
->switch_state
.previous_default
&& default_case
.is_empty()) {
5132 default_case
.append_list(&tmp
);
5136 /* If default case found, append 'after_default' list. */
5137 if (!default_case
.is_empty())
5138 after_default
.append_list(&tmp
);
5140 instructions
->append_list(&tmp
);
5143 /* Handle the default case. This is done here because default might not be
5144 * the last case. We need to add checks against following cases first to see
5145 * if default should be chosen or not.
5147 if (!default_case
.is_empty()) {
5149 ir_rvalue
*const true_val
= new (state
) ir_constant(true);
5150 ir_dereference_variable
*deref_run_default_var
=
5151 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5153 /* Choose to run default case initially, following conditional
5154 * assignments might change this.
5156 ir_assignment
*const init_var
=
5157 new(state
) ir_assignment(deref_run_default_var
, true_val
);
5158 instructions
->push_tail(init_var
);
5160 /* Default case was the last one, no checks required. */
5161 if (after_default
.is_empty()) {
5162 instructions
->append_list(&default_case
);
5166 foreach_in_list(ir_instruction
, ir
, &after_default
) {
5167 ir_assignment
*assign
= ir
->as_assignment();
5172 /* Clone the check between case label and init expression. */
5173 ir_expression
*exp
= (ir_expression
*) assign
->condition
;
5174 ir_expression
*clone
= exp
->clone(state
, NULL
);
5176 ir_dereference_variable
*deref_var
=
5177 new(state
) ir_dereference_variable(state
->switch_state
.run_default
);
5178 ir_rvalue
*const false_val
= new (state
) ir_constant(false);
5180 ir_assignment
*const set_false
=
5181 new(state
) ir_assignment(deref_var
, false_val
, clone
);
5183 instructions
->push_tail(set_false
);
5186 /* Append default case and all cases after it. */
5187 instructions
->append_list(&default_case
);
5188 instructions
->append_list(&after_default
);
5191 /* Case statements do not have r-values. */
5196 ast_case_statement::hir(exec_list
*instructions
,
5197 struct _mesa_glsl_parse_state
*state
)
5199 labels
->hir(instructions
, state
);
5201 /* Guard case statements depending on fallthru state. */
5202 ir_dereference_variable
*const deref_fallthru_guard
=
5203 new(state
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5204 ir_if
*const test_fallthru
= new(state
) ir_if(deref_fallthru_guard
);
5206 foreach_list_typed (ast_node
, stmt
, link
, & this->stmts
)
5207 stmt
->hir(& test_fallthru
->then_instructions
, state
);
5209 instructions
->push_tail(test_fallthru
);
5211 /* Case statements do not have r-values. */
5217 ast_case_label_list::hir(exec_list
*instructions
,
5218 struct _mesa_glsl_parse_state
*state
)
5220 foreach_list_typed (ast_case_label
, label
, link
, & this->labels
)
5221 label
->hir(instructions
, state
);
5223 /* Case labels do not have r-values. */
5228 ast_case_label::hir(exec_list
*instructions
,
5229 struct _mesa_glsl_parse_state
*state
)
5233 ir_dereference_variable
*deref_fallthru_var
=
5234 new(ctx
) ir_dereference_variable(state
->switch_state
.is_fallthru_var
);
5236 ir_rvalue
*const true_val
= new(ctx
) ir_constant(true);
5238 /* If not default case, ... */
5239 if (this->test_value
!= NULL
) {
5240 /* Conditionally set fallthru state based on
5241 * comparison of cached test expression value to case label.
5243 ir_rvalue
*const label_rval
= this->test_value
->hir(instructions
, state
);
5244 ir_constant
*label_const
= label_rval
->constant_expression_value();
5247 YYLTYPE loc
= this->test_value
->get_location();
5249 _mesa_glsl_error(& loc
, state
,
5250 "switch statement case label must be a "
5251 "constant expression");
5253 /* Stuff a dummy value in to allow processing to continue. */
5254 label_const
= new(ctx
) ir_constant(0);
5256 ast_expression
*previous_label
= (ast_expression
*)
5257 hash_table_find(state
->switch_state
.labels_ht
,
5258 (void *)(uintptr_t)label_const
->value
.u
[0]);
5260 if (previous_label
) {
5261 YYLTYPE loc
= this->test_value
->get_location();
5262 _mesa_glsl_error(& loc
, state
, "duplicate case value");
5264 loc
= previous_label
->get_location();
5265 _mesa_glsl_error(& loc
, state
, "this is the previous case label");
5267 hash_table_insert(state
->switch_state
.labels_ht
,
5269 (void *)(uintptr_t)label_const
->value
.u
[0]);
5273 ir_dereference_variable
*deref_test_var
=
5274 new(ctx
) ir_dereference_variable(state
->switch_state
.test_var
);
5276 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5281 * From GLSL 4.40 specification section 6.2 ("Selection"):
5283 * "The type of the init-expression value in a switch statement must
5284 * be a scalar int or uint. The type of the constant-expression value
5285 * in a case label also must be a scalar int or uint. When any pair
5286 * of these values is tested for "equal value" and the types do not
5287 * match, an implicit conversion will be done to convert the int to a
5288 * uint (see section 4.1.10 “Implicit Conversions”) before the compare
5291 if (label_const
->type
!= state
->switch_state
.test_var
->type
) {
5292 YYLTYPE loc
= this->test_value
->get_location();
5294 const glsl_type
*type_a
= label_const
->type
;
5295 const glsl_type
*type_b
= state
->switch_state
.test_var
->type
;
5297 /* Check if int->uint implicit conversion is supported. */
5298 bool integer_conversion_supported
=
5299 glsl_type::int_type
->can_implicitly_convert_to(glsl_type::uint_type
,
5302 if ((!type_a
->is_integer() || !type_b
->is_integer()) ||
5303 !integer_conversion_supported
) {
5304 _mesa_glsl_error(&loc
, state
, "type mismatch with switch "
5305 "init-expression and case label (%s != %s)",
5306 type_a
->name
, type_b
->name
);
5308 /* Conversion of the case label. */
5309 if (type_a
->base_type
== GLSL_TYPE_INT
) {
5310 if (!apply_implicit_conversion(glsl_type::uint_type
,
5311 test_cond
->operands
[0], state
))
5312 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5314 /* Conversion of the init-expression value. */
5315 if (!apply_implicit_conversion(glsl_type::uint_type
,
5316 test_cond
->operands
[1], state
))
5317 _mesa_glsl_error(&loc
, state
, "implicit type conversion error");
5322 ir_assignment
*set_fallthru_on_test
=
5323 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5325 instructions
->push_tail(set_fallthru_on_test
);
5326 } else { /* default case */
5327 if (state
->switch_state
.previous_default
) {
5328 YYLTYPE loc
= this->get_location();
5329 _mesa_glsl_error(& loc
, state
,
5330 "multiple default labels in one switch");
5332 loc
= state
->switch_state
.previous_default
->get_location();
5333 _mesa_glsl_error(& loc
, state
, "this is the first default label");
5335 state
->switch_state
.previous_default
= this;
5337 /* Set fallthru condition on 'run_default' bool. */
5338 ir_dereference_variable
*deref_run_default
=
5339 new(ctx
) ir_dereference_variable(state
->switch_state
.run_default
);
5340 ir_rvalue
*const cond_true
= new(ctx
) ir_constant(true);
5341 ir_expression
*test_cond
= new(ctx
) ir_expression(ir_binop_all_equal
,
5345 /* Set falltrhu state. */
5346 ir_assignment
*set_fallthru
=
5347 new(ctx
) ir_assignment(deref_fallthru_var
, true_val
, test_cond
);
5349 instructions
->push_tail(set_fallthru
);
5352 /* Case statements do not have r-values. */
5357 ast_iteration_statement::condition_to_hir(exec_list
*instructions
,
5358 struct _mesa_glsl_parse_state
*state
)
5362 if (condition
!= NULL
) {
5363 ir_rvalue
*const cond
=
5364 condition
->hir(instructions
, state
);
5367 || !cond
->type
->is_boolean() || !cond
->type
->is_scalar()) {
5368 YYLTYPE loc
= condition
->get_location();
5370 _mesa_glsl_error(& loc
, state
,
5371 "loop condition must be scalar boolean");
5373 /* As the first code in the loop body, generate a block that looks
5374 * like 'if (!condition) break;' as the loop termination condition.
5376 ir_rvalue
*const not_cond
=
5377 new(ctx
) ir_expression(ir_unop_logic_not
, cond
);
5379 ir_if
*const if_stmt
= new(ctx
) ir_if(not_cond
);
5381 ir_jump
*const break_stmt
=
5382 new(ctx
) ir_loop_jump(ir_loop_jump::jump_break
);
5384 if_stmt
->then_instructions
.push_tail(break_stmt
);
5385 instructions
->push_tail(if_stmt
);
5392 ast_iteration_statement::hir(exec_list
*instructions
,
5393 struct _mesa_glsl_parse_state
*state
)
5397 /* For-loops and while-loops start a new scope, but do-while loops do not.
5399 if (mode
!= ast_do_while
)
5400 state
->symbols
->push_scope();
5402 if (init_statement
!= NULL
)
5403 init_statement
->hir(instructions
, state
);
5405 ir_loop
*const stmt
= new(ctx
) ir_loop();
5406 instructions
->push_tail(stmt
);
5408 /* Track the current loop nesting. */
5409 ast_iteration_statement
*nesting_ast
= state
->loop_nesting_ast
;
5411 state
->loop_nesting_ast
= this;
5413 /* Likewise, indicate that following code is closest to a loop,
5414 * NOT closest to a switch.
5416 bool saved_is_switch_innermost
= state
->switch_state
.is_switch_innermost
;
5417 state
->switch_state
.is_switch_innermost
= false;
5419 if (mode
!= ast_do_while
)
5420 condition_to_hir(&stmt
->body_instructions
, state
);
5423 body
->hir(& stmt
->body_instructions
, state
);
5425 if (rest_expression
!= NULL
)
5426 rest_expression
->hir(& stmt
->body_instructions
, state
);
5428 if (mode
== ast_do_while
)
5429 condition_to_hir(&stmt
->body_instructions
, state
);
5431 if (mode
!= ast_do_while
)
5432 state
->symbols
->pop_scope();
5434 /* Restore previous nesting before returning. */
5435 state
->loop_nesting_ast
= nesting_ast
;
5436 state
->switch_state
.is_switch_innermost
= saved_is_switch_innermost
;
5438 /* Loops do not have r-values.
5445 * Determine if the given type is valid for establishing a default precision
5448 * From GLSL ES 3.00 section 4.5.4 ("Default Precision Qualifiers"):
5450 * "The precision statement
5452 * precision precision-qualifier type;
5454 * can be used to establish a default precision qualifier. The type field
5455 * can be either int or float or any of the sampler types, and the
5456 * precision-qualifier can be lowp, mediump, or highp."
5458 * GLSL ES 1.00 has similar language. GLSL 1.30 doesn't allow precision
5459 * qualifiers on sampler types, but this seems like an oversight (since the
5460 * intention of including these in GLSL 1.30 is to allow compatibility with ES
5461 * shaders). So we allow int, float, and all sampler types regardless of GLSL
5465 is_valid_default_precision_type(const struct glsl_type
*const type
)
5470 switch (type
->base_type
) {
5472 case GLSL_TYPE_FLOAT
:
5473 /* "int" and "float" are valid, but vectors and matrices are not. */
5474 return type
->vector_elements
== 1 && type
->matrix_columns
== 1;
5475 case GLSL_TYPE_SAMPLER
:
5476 case GLSL_TYPE_IMAGE
:
5477 case GLSL_TYPE_ATOMIC_UINT
:
5486 ast_type_specifier::hir(exec_list
*instructions
,
5487 struct _mesa_glsl_parse_state
*state
)
5489 if (this->default_precision
== ast_precision_none
&& this->structure
== NULL
)
5492 YYLTYPE loc
= this->get_location();
5494 /* If this is a precision statement, check that the type to which it is
5495 * applied is either float or int.
5497 * From section 4.5.3 of the GLSL 1.30 spec:
5498 * "The precision statement
5499 * precision precision-qualifier type;
5500 * can be used to establish a default precision qualifier. The type
5501 * field can be either int or float [...]. Any other types or
5502 * qualifiers will result in an error.
5504 if (this->default_precision
!= ast_precision_none
) {
5505 if (!state
->check_precision_qualifiers_allowed(&loc
))
5508 if (this->structure
!= NULL
) {
5509 _mesa_glsl_error(&loc
, state
,
5510 "precision qualifiers do not apply to structures");
5514 if (this->array_specifier
!= NULL
) {
5515 _mesa_glsl_error(&loc
, state
,
5516 "default precision statements do not apply to "
5521 const struct glsl_type
*const type
=
5522 state
->symbols
->get_type(this->type_name
);
5523 if (!is_valid_default_precision_type(type
)) {
5524 _mesa_glsl_error(&loc
, state
,
5525 "default precision statements apply only to "
5526 "float, int, and opaque types");
5530 if (type
->base_type
== GLSL_TYPE_FLOAT
5532 && state
->stage
== MESA_SHADER_FRAGMENT
) {
5533 /* Section 4.5.3 (Default Precision Qualifiers) of the GLSL ES 1.00
5536 * "The fragment language has no default precision qualifier for
5537 * floating point types."
5539 * As a result, we have to track whether or not default precision has
5540 * been specified for float in GLSL ES fragment shaders.
5542 * Earlier in that same section, the spec says:
5544 * "Non-precision qualified declarations will use the precision
5545 * qualifier specified in the most recent precision statement
5546 * that is still in scope. The precision statement has the same
5547 * scoping rules as variable declarations. If it is declared
5548 * inside a compound statement, its effect stops at the end of
5549 * the innermost statement it was declared in. Precision
5550 * statements in nested scopes override precision statements in
5551 * outer scopes. Multiple precision statements for the same basic
5552 * type can appear inside the same scope, with later statements
5553 * overriding earlier statements within that scope."
5555 * Default precision specifications follow the same scope rules as
5556 * variables. So, we can track the state of the default float
5557 * precision in the symbol table, and the rules will just work. This
5558 * is a slight abuse of the symbol table, but it has the semantics
5561 ir_variable
*const junk
=
5562 new(state
) ir_variable(type
, "#default precision",
5565 state
->symbols
->add_variable(junk
);
5568 /* FINISHME: Translate precision statements into IR. */
5572 /* _mesa_ast_set_aggregate_type() sets the <structure> field so that
5573 * process_record_constructor() can do type-checking on C-style initializer
5574 * expressions of structs, but ast_struct_specifier should only be translated
5575 * to HIR if it is declaring the type of a structure.
5577 * The ->is_declaration field is false for initializers of variables
5578 * declared separately from the struct's type definition.
5580 * struct S { ... }; (is_declaration = true)
5581 * struct T { ... } t = { ... }; (is_declaration = true)
5582 * S s = { ... }; (is_declaration = false)
5584 if (this->structure
!= NULL
&& this->structure
->is_declaration
)
5585 return this->structure
->hir(instructions
, state
);
5592 * Process a structure or interface block tree into an array of structure fields
5594 * After parsing, where there are some syntax differnces, structures and
5595 * interface blocks are almost identical. They are similar enough that the
5596 * AST for each can be processed the same way into a set of
5597 * \c glsl_struct_field to describe the members.
5599 * If we're processing an interface block, var_mode should be the type of the
5600 * interface block (ir_var_shader_in, ir_var_shader_out, ir_var_uniform or
5601 * ir_var_shader_storage). If we're processing a structure, var_mode should be
5605 * The number of fields processed. A pointer to the array structure fields is
5606 * stored in \c *fields_ret.
5609 ast_process_structure_or_interface_block(exec_list
*instructions
,
5610 struct _mesa_glsl_parse_state
*state
,
5611 exec_list
*declarations
,
5613 glsl_struct_field
**fields_ret
,
5615 enum glsl_matrix_layout matrix_layout
,
5616 bool allow_reserved_names
,
5617 ir_variable_mode var_mode
)
5619 unsigned decl_count
= 0;
5621 /* Make an initial pass over the list of fields to determine how
5622 * many there are. Each element in this list is an ast_declarator_list.
5623 * This means that we actually need to count the number of elements in the
5624 * 'declarations' list in each of the elements.
5626 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
5627 decl_count
+= decl_list
->declarations
.length();
5630 /* Allocate storage for the fields and process the field
5631 * declarations. As the declarations are processed, try to also convert
5632 * the types to HIR. This ensures that structure definitions embedded in
5633 * other structure definitions or in interface blocks are processed.
5635 glsl_struct_field
*const fields
= ralloc_array(state
, glsl_struct_field
,
5639 foreach_list_typed (ast_declarator_list
, decl_list
, link
, declarations
) {
5640 const char *type_name
;
5642 decl_list
->type
->specifier
->hir(instructions
, state
);
5644 /* Section 10.9 of the GLSL ES 1.00 specification states that
5645 * embedded structure definitions have been removed from the language.
5647 if (state
->es_shader
&& decl_list
->type
->specifier
->structure
!= NULL
) {
5648 _mesa_glsl_error(&loc
, state
, "embedded structure definitions are "
5649 "not allowed in GLSL ES 1.00");
5652 const glsl_type
*decl_type
=
5653 decl_list
->type
->glsl_type(& type_name
, state
);
5655 foreach_list_typed (ast_declaration
, decl
, link
,
5656 &decl_list
->declarations
) {
5657 if (!allow_reserved_names
)
5658 validate_identifier(decl
->identifier
, loc
, state
);
5660 /* From section 4.3.9 of the GLSL 4.40 spec:
5662 * "[In interface blocks] opaque types are not allowed."
5664 * It should be impossible for decl_type to be NULL here. Cases that
5665 * might naturally lead to decl_type being NULL, especially for the
5666 * is_interface case, will have resulted in compilation having
5667 * already halted due to a syntax error.
5669 const struct glsl_type
*field_type
=
5670 decl_type
!= NULL
? decl_type
: glsl_type::error_type
;
5672 if (is_interface
&& field_type
->contains_opaque()) {
5673 YYLTYPE loc
= decl_list
->get_location();
5674 _mesa_glsl_error(&loc
, state
,
5675 "uniform/buffer in non-default interface block contains "
5679 if (field_type
->contains_atomic()) {
5680 /* From section 4.1.7.3 of the GLSL 4.40 spec:
5682 * "Members of structures cannot be declared as atomic counter
5685 YYLTYPE loc
= decl_list
->get_location();
5686 _mesa_glsl_error(&loc
, state
, "atomic counter in structure, "
5687 "shader storage block or uniform block");
5690 if (field_type
->contains_image()) {
5691 /* FINISHME: Same problem as with atomic counters.
5692 * FINISHME: Request clarification from Khronos and add
5693 * FINISHME: spec quotation here.
5695 YYLTYPE loc
= decl_list
->get_location();
5696 _mesa_glsl_error(&loc
, state
,
5697 "image in structure, shader storage block or "
5701 const struct ast_type_qualifier
*const qual
=
5702 & decl_list
->type
->qualifier
;
5703 if (qual
->flags
.q
.std140
||
5704 qual
->flags
.q
.packed
||
5705 qual
->flags
.q
.shared
) {
5706 _mesa_glsl_error(&loc
, state
,
5707 "uniform/shader storage block layout qualifiers "
5708 "std140, packed, and shared can only be applied "
5709 "to uniform/shader storage blocks, not members");
5712 if (qual
->flags
.q
.constant
) {
5713 YYLTYPE loc
= decl_list
->get_location();
5714 _mesa_glsl_error(&loc
, state
,
5715 "const storage qualifier cannot be applied "
5716 "to struct or interface block members");
5719 field_type
= process_array_type(&loc
, decl_type
,
5720 decl
->array_specifier
, state
);
5721 fields
[i
].type
= field_type
;
5722 fields
[i
].name
= decl
->identifier
;
5723 fields
[i
].location
= -1;
5724 fields
[i
].interpolation
=
5725 interpret_interpolation_qualifier(qual
, var_mode
, state
, &loc
);
5726 fields
[i
].centroid
= qual
->flags
.q
.centroid
? 1 : 0;
5727 fields
[i
].sample
= qual
->flags
.q
.sample
? 1 : 0;
5728 fields
[i
].patch
= qual
->flags
.q
.patch
? 1 : 0;
5730 /* Only save explicitly defined streams in block's field */
5731 fields
[i
].stream
= qual
->flags
.q
.explicit_stream
? qual
->stream
: -1;
5733 if (qual
->flags
.q
.row_major
|| qual
->flags
.q
.column_major
) {
5734 if (!qual
->flags
.q
.uniform
&& !qual
->flags
.q
.buffer
) {
5735 _mesa_glsl_error(&loc
, state
,
5736 "row_major and column_major can only be "
5737 "applied to interface blocks");
5739 validate_matrix_layout_for_type(state
, &loc
, field_type
, NULL
);
5742 if (qual
->flags
.q
.uniform
&& qual
->has_interpolation()) {
5743 _mesa_glsl_error(&loc
, state
,
5744 "interpolation qualifiers cannot be used "
5745 "with uniform interface blocks");
5748 if ((qual
->flags
.q
.uniform
|| !is_interface
) &&
5749 qual
->has_auxiliary_storage()) {
5750 _mesa_glsl_error(&loc
, state
,
5751 "auxiliary storage qualifiers cannot be used "
5752 "in uniform blocks or structures.");
5755 /* Propogate row- / column-major information down the fields of the
5756 * structure or interface block. Structures need this data because
5757 * the structure may contain a structure that contains ... a matrix
5758 * that need the proper layout.
5760 if (field_type
->without_array()->is_matrix()
5761 || field_type
->without_array()->is_record()) {
5762 /* If no layout is specified for the field, inherit the layout
5765 fields
[i
].matrix_layout
= matrix_layout
;
5767 if (qual
->flags
.q
.row_major
)
5768 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
5769 else if (qual
->flags
.q
.column_major
)
5770 fields
[i
].matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
5772 /* If we're processing an interface block, the matrix layout must
5773 * be decided by this point.
5775 assert(!is_interface
5776 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_ROW_MAJOR
5777 || fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
);
5784 assert(i
== decl_count
);
5786 *fields_ret
= fields
;
5792 ast_struct_specifier::hir(exec_list
*instructions
,
5793 struct _mesa_glsl_parse_state
*state
)
5795 YYLTYPE loc
= this->get_location();
5797 /* Section 4.1.8 (Structures) of the GLSL 1.10 spec says:
5799 * "Anonymous structures are not supported; so embedded structures must
5800 * have a declarator. A name given to an embedded struct is scoped at
5801 * the same level as the struct it is embedded in."
5803 * The same section of the GLSL 1.20 spec says:
5805 * "Anonymous structures are not supported. Embedded structures are not
5808 * struct S { float f; };
5810 * S; // Error: anonymous structures disallowed
5811 * struct { ... }; // Error: embedded structures disallowed
5812 * S s; // Okay: nested structures with name are allowed
5815 * The GLSL ES 1.00 and 3.00 specs have similar langauge and examples. So,
5816 * we allow embedded structures in 1.10 only.
5818 if (state
->language_version
!= 110 && state
->struct_specifier_depth
!= 0)
5819 _mesa_glsl_error(&loc
, state
,
5820 "embedded structure declarations are not allowed");
5822 state
->struct_specifier_depth
++;
5824 glsl_struct_field
*fields
;
5825 unsigned decl_count
=
5826 ast_process_structure_or_interface_block(instructions
,
5828 &this->declarations
,
5832 GLSL_MATRIX_LAYOUT_INHERITED
,
5833 false /* allow_reserved_names */,
5836 validate_identifier(this->name
, loc
, state
);
5838 const glsl_type
*t
=
5839 glsl_type::get_record_instance(fields
, decl_count
, this->name
);
5841 if (!state
->symbols
->add_type(name
, t
)) {
5842 _mesa_glsl_error(& loc
, state
, "struct `%s' previously defined", name
);
5844 const glsl_type
**s
= reralloc(state
, state
->user_structures
,
5846 state
->num_user_structures
+ 1);
5848 s
[state
->num_user_structures
] = t
;
5849 state
->user_structures
= s
;
5850 state
->num_user_structures
++;
5854 state
->struct_specifier_depth
--;
5856 /* Structure type definitions do not have r-values.
5863 * Visitor class which detects whether a given interface block has been used.
5865 class interface_block_usage_visitor
: public ir_hierarchical_visitor
5868 interface_block_usage_visitor(ir_variable_mode mode
, const glsl_type
*block
)
5869 : mode(mode
), block(block
), found(false)
5873 virtual ir_visitor_status
visit(ir_dereference_variable
*ir
)
5875 if (ir
->var
->data
.mode
== mode
&& ir
->var
->get_interface_type() == block
) {
5879 return visit_continue
;
5882 bool usage_found() const
5888 ir_variable_mode mode
;
5889 const glsl_type
*block
;
5895 ast_interface_block::hir(exec_list
*instructions
,
5896 struct _mesa_glsl_parse_state
*state
)
5898 YYLTYPE loc
= this->get_location();
5900 /* Interface blocks must be declared at global scope */
5901 if (state
->current_function
!= NULL
) {
5902 _mesa_glsl_error(&loc
, state
,
5903 "Interface block `%s' must be declared "
5908 /* The ast_interface_block has a list of ast_declarator_lists. We
5909 * need to turn those into ir_variables with an association
5910 * with this uniform block.
5912 enum glsl_interface_packing packing
;
5913 if (this->layout
.flags
.q
.shared
) {
5914 packing
= GLSL_INTERFACE_PACKING_SHARED
;
5915 } else if (this->layout
.flags
.q
.packed
) {
5916 packing
= GLSL_INTERFACE_PACKING_PACKED
;
5918 /* The default layout is std140.
5920 packing
= GLSL_INTERFACE_PACKING_STD140
;
5923 ir_variable_mode var_mode
;
5924 const char *iface_type_name
;
5925 if (this->layout
.flags
.q
.in
) {
5926 var_mode
= ir_var_shader_in
;
5927 iface_type_name
= "in";
5928 } else if (this->layout
.flags
.q
.out
) {
5929 var_mode
= ir_var_shader_out
;
5930 iface_type_name
= "out";
5931 } else if (this->layout
.flags
.q
.uniform
) {
5932 var_mode
= ir_var_uniform
;
5933 iface_type_name
= "uniform";
5934 } else if (this->layout
.flags
.q
.buffer
) {
5935 var_mode
= ir_var_shader_storage
;
5936 iface_type_name
= "buffer";
5938 var_mode
= ir_var_auto
;
5939 iface_type_name
= "UNKNOWN";
5940 assert(!"interface block layout qualifier not found!");
5943 enum glsl_matrix_layout matrix_layout
= GLSL_MATRIX_LAYOUT_INHERITED
;
5944 if (this->layout
.flags
.q
.row_major
)
5945 matrix_layout
= GLSL_MATRIX_LAYOUT_ROW_MAJOR
;
5946 else if (this->layout
.flags
.q
.column_major
)
5947 matrix_layout
= GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
;
5949 bool redeclaring_per_vertex
= strcmp(this->block_name
, "gl_PerVertex") == 0;
5950 exec_list declared_variables
;
5951 glsl_struct_field
*fields
;
5953 /* Treat an interface block as one level of nesting, so that embedded struct
5954 * specifiers will be disallowed.
5956 state
->struct_specifier_depth
++;
5958 unsigned int num_variables
=
5959 ast_process_structure_or_interface_block(&declared_variables
,
5961 &this->declarations
,
5966 redeclaring_per_vertex
,
5969 state
->struct_specifier_depth
--;
5971 if (!redeclaring_per_vertex
) {
5972 validate_identifier(this->block_name
, loc
, state
);
5974 /* From section 4.3.9 ("Interface Blocks") of the GLSL 4.50 spec:
5976 * "Block names have no other use within a shader beyond interface
5977 * matching; it is a compile-time error to use a block name at global
5978 * scope for anything other than as a block name."
5980 ir_variable
*var
= state
->symbols
->get_variable(this->block_name
);
5981 if (var
&& !var
->type
->is_interface()) {
5982 _mesa_glsl_error(&loc
, state
, "Block name `%s' is "
5983 "already used in the scope.",
5988 const glsl_type
*earlier_per_vertex
= NULL
;
5989 if (redeclaring_per_vertex
) {
5990 /* Find the previous declaration of gl_PerVertex. If we're redeclaring
5991 * the named interface block gl_in, we can find it by looking at the
5992 * previous declaration of gl_in. Otherwise we can find it by looking
5993 * at the previous decalartion of any of the built-in outputs,
5996 * Also check that the instance name and array-ness of the redeclaration
6000 case ir_var_shader_in
:
6001 if (ir_variable
*earlier_gl_in
=
6002 state
->symbols
->get_variable("gl_in")) {
6003 earlier_per_vertex
= earlier_gl_in
->get_interface_type();
6005 _mesa_glsl_error(&loc
, state
,
6006 "redeclaration of gl_PerVertex input not allowed "
6008 _mesa_shader_stage_to_string(state
->stage
));
6010 if (this->instance_name
== NULL
||
6011 strcmp(this->instance_name
, "gl_in") != 0 || this->array_specifier
== NULL
) {
6012 _mesa_glsl_error(&loc
, state
,
6013 "gl_PerVertex input must be redeclared as "
6017 case ir_var_shader_out
:
6018 if (ir_variable
*earlier_gl_Position
=
6019 state
->symbols
->get_variable("gl_Position")) {
6020 earlier_per_vertex
= earlier_gl_Position
->get_interface_type();
6021 } else if (ir_variable
*earlier_gl_out
=
6022 state
->symbols
->get_variable("gl_out")) {
6023 earlier_per_vertex
= earlier_gl_out
->get_interface_type();
6025 _mesa_glsl_error(&loc
, state
,
6026 "redeclaration of gl_PerVertex output not "
6027 "allowed in the %s shader",
6028 _mesa_shader_stage_to_string(state
->stage
));
6030 if (state
->stage
== MESA_SHADER_TESS_CTRL
) {
6031 if (this->instance_name
== NULL
||
6032 strcmp(this->instance_name
, "gl_out") != 0 || this->array_specifier
== NULL
) {
6033 _mesa_glsl_error(&loc
, state
,
6034 "gl_PerVertex output must be redeclared as "
6038 if (this->instance_name
!= NULL
) {
6039 _mesa_glsl_error(&loc
, state
,
6040 "gl_PerVertex output may not be redeclared with "
6041 "an instance name");
6046 _mesa_glsl_error(&loc
, state
,
6047 "gl_PerVertex must be declared as an input or an "
6052 if (earlier_per_vertex
== NULL
) {
6053 /* An error has already been reported. Bail out to avoid null
6054 * dereferences later in this function.
6059 /* Copy locations from the old gl_PerVertex interface block. */
6060 for (unsigned i
= 0; i
< num_variables
; i
++) {
6061 int j
= earlier_per_vertex
->field_index(fields
[i
].name
);
6063 _mesa_glsl_error(&loc
, state
,
6064 "redeclaration of gl_PerVertex must be a subset "
6065 "of the built-in members of gl_PerVertex");
6067 fields
[i
].location
=
6068 earlier_per_vertex
->fields
.structure
[j
].location
;
6069 fields
[i
].interpolation
=
6070 earlier_per_vertex
->fields
.structure
[j
].interpolation
;
6071 fields
[i
].centroid
=
6072 earlier_per_vertex
->fields
.structure
[j
].centroid
;
6074 earlier_per_vertex
->fields
.structure
[j
].sample
;
6076 earlier_per_vertex
->fields
.structure
[j
].patch
;
6080 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
6083 * If a built-in interface block is redeclared, it must appear in
6084 * the shader before any use of any member included in the built-in
6085 * declaration, or a compilation error will result.
6087 * This appears to be a clarification to the behaviour established for
6088 * gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
6089 * regardless of GLSL version.
6091 interface_block_usage_visitor
v(var_mode
, earlier_per_vertex
);
6092 v
.run(instructions
);
6093 if (v
.usage_found()) {
6094 _mesa_glsl_error(&loc
, state
,
6095 "redeclaration of a built-in interface block must "
6096 "appear before any use of any member of the "
6101 const glsl_type
*block_type
=
6102 glsl_type::get_interface_instance(fields
,
6106 if (this->layout
.flags
.q
.explicit_binding
)
6107 validate_binding_qualifier(state
, &loc
, block_type
, &this->layout
);
6109 if (!state
->symbols
->add_interface(block_type
->name
, block_type
, var_mode
)) {
6110 YYLTYPE loc
= this->get_location();
6111 _mesa_glsl_error(&loc
, state
, "interface block `%s' with type `%s' "
6112 "already taken in the current scope",
6113 this->block_name
, iface_type_name
);
6116 /* Since interface blocks cannot contain statements, it should be
6117 * impossible for the block to generate any instructions.
6119 assert(declared_variables
.is_empty());
6121 /* From section 4.3.4 (Inputs) of the GLSL 1.50 spec:
6123 * Geometry shader input variables get the per-vertex values written
6124 * out by vertex shader output variables of the same names. Since a
6125 * geometry shader operates on a set of vertices, each input varying
6126 * variable (or input block, see interface blocks below) needs to be
6127 * declared as an array.
6129 if (state
->stage
== MESA_SHADER_GEOMETRY
&& this->array_specifier
== NULL
&&
6130 var_mode
== ir_var_shader_in
) {
6131 _mesa_glsl_error(&loc
, state
, "geometry shader inputs must be arrays");
6132 } else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6133 state
->stage
== MESA_SHADER_TESS_EVAL
) &&
6134 this->array_specifier
== NULL
&&
6135 var_mode
== ir_var_shader_in
) {
6136 _mesa_glsl_error(&loc
, state
, "per-vertex tessellation shader inputs must be arrays");
6137 } else if (state
->stage
== MESA_SHADER_TESS_CTRL
&&
6138 this->array_specifier
== NULL
&&
6139 var_mode
== ir_var_shader_out
) {
6140 _mesa_glsl_error(&loc
, state
, "tessellation control shader outputs must be arrays");
6144 /* Page 39 (page 45 of the PDF) of section 4.3.7 in the GLSL ES 3.00 spec
6147 * "If an instance name (instance-name) is used, then it puts all the
6148 * members inside a scope within its own name space, accessed with the
6149 * field selector ( . ) operator (analogously to structures)."
6151 if (this->instance_name
) {
6152 if (redeclaring_per_vertex
) {
6153 /* When a built-in in an unnamed interface block is redeclared,
6154 * get_variable_being_redeclared() calls
6155 * check_builtin_array_max_size() to make sure that built-in array
6156 * variables aren't redeclared to illegal sizes. But we're looking
6157 * at a redeclaration of a named built-in interface block. So we
6158 * have to manually call check_builtin_array_max_size() for all parts
6159 * of the interface that are arrays.
6161 for (unsigned i
= 0; i
< num_variables
; i
++) {
6162 if (fields
[i
].type
->is_array()) {
6163 const unsigned size
= fields
[i
].type
->array_size();
6164 check_builtin_array_max_size(fields
[i
].name
, size
, loc
, state
);
6168 validate_identifier(this->instance_name
, loc
, state
);
6173 if (this->array_specifier
!= NULL
) {
6174 /* Section 4.3.7 (Interface Blocks) of the GLSL 1.50 spec says:
6176 * For uniform blocks declared an array, each individual array
6177 * element corresponds to a separate buffer object backing one
6178 * instance of the block. As the array size indicates the number
6179 * of buffer objects needed, uniform block array declarations
6180 * must specify an array size.
6182 * And a few paragraphs later:
6184 * Geometry shader input blocks must be declared as arrays and
6185 * follow the array declaration and linking rules for all
6186 * geometry shader inputs. All other input and output block
6187 * arrays must specify an array size.
6189 * The same applies to tessellation shaders.
6191 * The upshot of this is that the only circumstance where an
6192 * interface array size *doesn't* need to be specified is on a
6193 * geometry shader input, tessellation control shader input,
6194 * tessellation control shader output, and tessellation evaluation
6197 if (this->array_specifier
->is_unsized_array
) {
6198 bool allow_inputs
= state
->stage
== MESA_SHADER_GEOMETRY
||
6199 state
->stage
== MESA_SHADER_TESS_CTRL
||
6200 state
->stage
== MESA_SHADER_TESS_EVAL
;
6201 bool allow_outputs
= state
->stage
== MESA_SHADER_TESS_CTRL
;
6203 if (this->layout
.flags
.q
.in
) {
6205 _mesa_glsl_error(&loc
, state
,
6206 "unsized input block arrays not allowed in "
6208 _mesa_shader_stage_to_string(state
->stage
));
6209 } else if (this->layout
.flags
.q
.out
) {
6211 _mesa_glsl_error(&loc
, state
,
6212 "unsized output block arrays not allowed in "
6214 _mesa_shader_stage_to_string(state
->stage
));
6216 /* by elimination, this is a uniform block array */
6217 _mesa_glsl_error(&loc
, state
,
6218 "unsized uniform block arrays not allowed in "
6220 _mesa_shader_stage_to_string(state
->stage
));
6224 const glsl_type
*block_array_type
=
6225 process_array_type(&loc
, block_type
, this->array_specifier
, state
);
6227 /* From section 4.3.9 (Interface Blocks) of the GLSL ES 3.10 spec:
6229 * * Arrays of arrays of blocks are not allowed
6231 if (state
->es_shader
&& block_array_type
->is_array() &&
6232 block_array_type
->fields
.array
->is_array()) {
6233 _mesa_glsl_error(&loc
, state
,
6234 "arrays of arrays interface blocks are "
6238 if (this->layout
.flags
.q
.explicit_binding
)
6239 validate_binding_qualifier(state
, &loc
, block_array_type
,
6242 var
= new(state
) ir_variable(block_array_type
,
6243 this->instance_name
,
6246 var
= new(state
) ir_variable(block_type
,
6247 this->instance_name
,
6251 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
6252 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
6254 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
6255 var
->data
.read_only
= true;
6257 if (state
->stage
== MESA_SHADER_GEOMETRY
&& var_mode
== ir_var_shader_in
)
6258 handle_geometry_shader_input_decl(state
, loc
, var
);
6259 else if ((state
->stage
== MESA_SHADER_TESS_CTRL
||
6260 state
->stage
== MESA_SHADER_TESS_EVAL
) && var_mode
== ir_var_shader_in
)
6261 handle_tess_shader_input_decl(state
, loc
, var
);
6262 else if (state
->stage
== MESA_SHADER_TESS_CTRL
&& var_mode
== ir_var_shader_out
)
6263 handle_tess_ctrl_shader_output_decl(state
, loc
, var
);
6265 if (ir_variable
*earlier
=
6266 state
->symbols
->get_variable(this->instance_name
)) {
6267 if (!redeclaring_per_vertex
) {
6268 _mesa_glsl_error(&loc
, state
, "`%s' redeclared",
6269 this->instance_name
);
6271 earlier
->data
.how_declared
= ir_var_declared_normally
;
6272 earlier
->type
= var
->type
;
6273 earlier
->reinit_interface_type(block_type
);
6276 /* Propagate the "binding" keyword into this UBO's fields;
6277 * the UBO declaration itself doesn't get an ir_variable unless it
6278 * has an instance name. This is ugly.
6280 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
6281 var
->data
.binding
= this->layout
.binding
;
6283 var
->data
.vk_set
= this->layout
.flags
.q
.vk_set
;
6284 var
->data
.set
= this->layout
.set
;
6285 var
->data
.binding
= this->layout
.binding
;
6287 state
->symbols
->add_variable(var
);
6288 instructions
->push_tail(var
);
6291 /* In order to have an array size, the block must also be declared with
6294 assert(this->array_specifier
== NULL
);
6296 for (unsigned i
= 0; i
< num_variables
; i
++) {
6298 new(state
) ir_variable(fields
[i
].type
,
6299 ralloc_strdup(state
, fields
[i
].name
),
6301 var
->data
.interpolation
= fields
[i
].interpolation
;
6302 var
->data
.centroid
= fields
[i
].centroid
;
6303 var
->data
.sample
= fields
[i
].sample
;
6304 var
->data
.patch
= fields
[i
].patch
;
6305 var
->init_interface_type(block_type
);
6307 if (var_mode
== ir_var_shader_in
|| var_mode
== ir_var_uniform
)
6308 var
->data
.read_only
= true;
6310 if (fields
[i
].matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
) {
6311 var
->data
.matrix_layout
= matrix_layout
== GLSL_MATRIX_LAYOUT_INHERITED
6312 ? GLSL_MATRIX_LAYOUT_COLUMN_MAJOR
: matrix_layout
;
6314 var
->data
.matrix_layout
= fields
[i
].matrix_layout
;
6317 if (fields
[i
].stream
!= -1 &&
6318 ((unsigned)fields
[i
].stream
) != this->layout
.stream
) {
6319 _mesa_glsl_error(&loc
, state
,
6320 "stream layout qualifier on "
6321 "interface block member `%s' does not match "
6322 "the interface block (%d vs %d)",
6323 var
->name
, fields
[i
].stream
, this->layout
.stream
);
6326 var
->data
.stream
= this->layout
.stream
;
6328 /* Examine var name here since var may get deleted in the next call */
6329 bool var_is_gl_id
= is_gl_identifier(var
->name
);
6331 if (redeclaring_per_vertex
) {
6332 ir_variable
*earlier
=
6333 get_variable_being_redeclared(var
, loc
, state
,
6334 true /* allow_all_redeclarations */);
6335 if (!var_is_gl_id
|| earlier
== NULL
) {
6336 _mesa_glsl_error(&loc
, state
,
6337 "redeclaration of gl_PerVertex can only "
6338 "include built-in variables");
6339 } else if (earlier
->data
.how_declared
== ir_var_declared_normally
) {
6340 _mesa_glsl_error(&loc
, state
,
6341 "`%s' has already been redeclared",
6344 earlier
->data
.how_declared
= ir_var_declared_in_block
;
6345 earlier
->reinit_interface_type(block_type
);
6350 if (state
->symbols
->get_variable(var
->name
) != NULL
)
6351 _mesa_glsl_error(&loc
, state
, "`%s' redeclared", var
->name
);
6353 /* Propagate the "binding" keyword into this UBO/SSBO's fields.
6354 * The UBO declaration itself doesn't get an ir_variable unless it
6355 * has an instance name. This is ugly.
6357 var
->data
.explicit_binding
= this->layout
.flags
.q
.explicit_binding
;
6358 var
->data
.binding
= this->layout
.binding
;
6360 var
->data
.vk_set
= this->layout
.flags
.q
.vk_set
;
6361 var
->data
.set
= this->layout
.set
;
6362 var
->data
.binding
= this->layout
.binding
;
6364 state
->symbols
->add_variable(var
);
6365 instructions
->push_tail(var
);
6368 if (redeclaring_per_vertex
&& block_type
!= earlier_per_vertex
) {
6369 /* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10 spec:
6371 * It is also a compilation error ... to redeclare a built-in
6372 * block and then use a member from that built-in block that was
6373 * not included in the redeclaration.
6375 * This appears to be a clarification to the behaviour established
6376 * for gl_PerVertex by GLSL 1.50, therefore we implement this
6377 * behaviour regardless of GLSL version.
6379 * To prevent the shader from using a member that was not included in
6380 * the redeclaration, we disable any ir_variables that are still
6381 * associated with the old declaration of gl_PerVertex (since we've
6382 * already updated all of the variables contained in the new
6383 * gl_PerVertex to point to it).
6385 * As a side effect this will prevent
6386 * validate_intrastage_interface_blocks() from getting confused and
6387 * thinking there are conflicting definitions of gl_PerVertex in the
6390 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
6391 ir_variable
*const var
= node
->as_variable();
6393 var
->get_interface_type() == earlier_per_vertex
&&
6394 var
->data
.mode
== var_mode
) {
6395 if (var
->data
.how_declared
== ir_var_declared_normally
) {
6396 _mesa_glsl_error(&loc
, state
,
6397 "redeclaration of gl_PerVertex cannot "
6398 "follow a redeclaration of `%s'",
6401 state
->symbols
->disable_variable(var
->name
);
6413 ast_tcs_output_layout::hir(exec_list
*instructions
,
6414 struct _mesa_glsl_parse_state
*state
)
6416 YYLTYPE loc
= this->get_location();
6418 /* If any tessellation control output layout declaration preceded this
6419 * one, make sure it was consistent with this one.
6421 if (state
->tcs_output_vertices_specified
&&
6422 state
->out_qualifier
->vertices
!= this->vertices
) {
6423 _mesa_glsl_error(&loc
, state
,
6424 "tessellation control shader output layout does not "
6425 "match previous declaration");
6429 /* If any shader outputs occurred before this declaration and specified an
6430 * array size, make sure the size they specified is consistent with the
6433 unsigned num_vertices
= this->vertices
;
6434 if (state
->tcs_output_size
!= 0 && state
->tcs_output_size
!= num_vertices
) {
6435 _mesa_glsl_error(&loc
, state
,
6436 "this tessellation control shader output layout "
6437 "specifies %u vertices, but a previous output "
6438 "is declared with size %u",
6439 num_vertices
, state
->tcs_output_size
);
6443 state
->tcs_output_vertices_specified
= true;
6445 /* If any shader outputs occurred before this declaration and did not
6446 * specify an array size, their size is determined now.
6448 foreach_in_list (ir_instruction
, node
, instructions
) {
6449 ir_variable
*var
= node
->as_variable();
6450 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_out
)
6453 /* Note: Not all tessellation control shader output are arrays. */
6454 if (!var
->type
->is_unsized_array() || var
->data
.patch
)
6457 if (var
->data
.max_array_access
>= num_vertices
) {
6458 _mesa_glsl_error(&loc
, state
,
6459 "this tessellation control shader output layout "
6460 "specifies %u vertices, but an access to element "
6461 "%u of output `%s' already exists", num_vertices
,
6462 var
->data
.max_array_access
, var
->name
);
6464 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
6474 ast_gs_input_layout::hir(exec_list
*instructions
,
6475 struct _mesa_glsl_parse_state
*state
)
6477 YYLTYPE loc
= this->get_location();
6479 /* If any geometry input layout declaration preceded this one, make sure it
6480 * was consistent with this one.
6482 if (state
->gs_input_prim_type_specified
&&
6483 state
->in_qualifier
->prim_type
!= this->prim_type
) {
6484 _mesa_glsl_error(&loc
, state
,
6485 "geometry shader input layout does not match"
6486 " previous declaration");
6490 /* If any shader inputs occurred before this declaration and specified an
6491 * array size, make sure the size they specified is consistent with the
6494 unsigned num_vertices
= vertices_per_prim(this->prim_type
);
6495 if (state
->gs_input_size
!= 0 && state
->gs_input_size
!= num_vertices
) {
6496 _mesa_glsl_error(&loc
, state
,
6497 "this geometry shader input layout implies %u vertices"
6498 " per primitive, but a previous input is declared"
6499 " with size %u", num_vertices
, state
->gs_input_size
);
6503 state
->gs_input_prim_type_specified
= true;
6505 /* If any shader inputs occurred before this declaration and did not
6506 * specify an array size, their size is determined now.
6508 foreach_in_list(ir_instruction
, node
, instructions
) {
6509 ir_variable
*var
= node
->as_variable();
6510 if (var
== NULL
|| var
->data
.mode
!= ir_var_shader_in
)
6513 /* Note: gl_PrimitiveIDIn has mode ir_var_shader_in, but it's not an
6517 if (var
->type
->is_unsized_array()) {
6518 if (var
->data
.max_array_access
>= num_vertices
) {
6519 _mesa_glsl_error(&loc
, state
,
6520 "this geometry shader input layout implies %u"
6521 " vertices, but an access to element %u of input"
6522 " `%s' already exists", num_vertices
,
6523 var
->data
.max_array_access
, var
->name
);
6525 var
->type
= glsl_type::get_array_instance(var
->type
->fields
.array
,
6536 ast_cs_input_layout::hir(exec_list
*instructions
,
6537 struct _mesa_glsl_parse_state
*state
)
6539 YYLTYPE loc
= this->get_location();
6541 /* If any compute input layout declaration preceded this one, make sure it
6542 * was consistent with this one.
6544 if (state
->cs_input_local_size_specified
) {
6545 for (int i
= 0; i
< 3; i
++) {
6546 if (state
->cs_input_local_size
[i
] != this->local_size
[i
]) {
6547 _mesa_glsl_error(&loc
, state
,
6548 "compute shader input layout does not match"
6549 " previous declaration");
6555 /* From the ARB_compute_shader specification:
6557 * If the local size of the shader in any dimension is greater
6558 * than the maximum size supported by the implementation for that
6559 * dimension, a compile-time error results.
6561 * It is not clear from the spec how the error should be reported if
6562 * the total size of the work group exceeds
6563 * MAX_COMPUTE_WORK_GROUP_INVOCATIONS, but it seems reasonable to
6564 * report it at compile time as well.
6566 GLuint64 total_invocations
= 1;
6567 for (int i
= 0; i
< 3; i
++) {
6568 if (this->local_size
[i
] > state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]) {
6569 _mesa_glsl_error(&loc
, state
,
6570 "local_size_%c exceeds MAX_COMPUTE_WORK_GROUP_SIZE"
6572 state
->ctx
->Const
.MaxComputeWorkGroupSize
[i
]);
6575 total_invocations
*= this->local_size
[i
];
6576 if (total_invocations
>
6577 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
) {
6578 _mesa_glsl_error(&loc
, state
,
6579 "product of local_sizes exceeds "
6580 "MAX_COMPUTE_WORK_GROUP_INVOCATIONS (%d)",
6581 state
->ctx
->Const
.MaxComputeWorkGroupInvocations
);
6586 state
->cs_input_local_size_specified
= true;
6587 for (int i
= 0; i
< 3; i
++)
6588 state
->cs_input_local_size
[i
] = this->local_size
[i
];
6590 /* We may now declare the built-in constant gl_WorkGroupSize (see
6591 * builtin_variable_generator::generate_constants() for why we didn't
6592 * declare it earlier).
6594 ir_variable
*var
= new(state
->symbols
)
6595 ir_variable(glsl_type::uvec3_type
, "gl_WorkGroupSize", ir_var_auto
);
6596 var
->data
.how_declared
= ir_var_declared_implicitly
;
6597 var
->data
.read_only
= true;
6598 instructions
->push_tail(var
);
6599 state
->symbols
->add_variable(var
);
6600 ir_constant_data data
;
6601 memset(&data
, 0, sizeof(data
));
6602 for (int i
= 0; i
< 3; i
++)
6603 data
.u
[i
] = this->local_size
[i
];
6604 var
->constant_value
= new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
6605 var
->constant_initializer
=
6606 new(var
) ir_constant(glsl_type::uvec3_type
, &data
);
6607 var
->data
.has_initializer
= true;
6614 detect_conflicting_assignments(struct _mesa_glsl_parse_state
*state
,
6615 exec_list
*instructions
)
6617 bool gl_FragColor_assigned
= false;
6618 bool gl_FragData_assigned
= false;
6619 bool user_defined_fs_output_assigned
= false;
6620 ir_variable
*user_defined_fs_output
= NULL
;
6622 /* It would be nice to have proper location information. */
6624 memset(&loc
, 0, sizeof(loc
));
6626 foreach_in_list(ir_instruction
, node
, instructions
) {
6627 ir_variable
*var
= node
->as_variable();
6629 if (!var
|| !var
->data
.assigned
)
6632 if (strcmp(var
->name
, "gl_FragColor") == 0)
6633 gl_FragColor_assigned
= true;
6634 else if (strcmp(var
->name
, "gl_FragData") == 0)
6635 gl_FragData_assigned
= true;
6636 else if (!is_gl_identifier(var
->name
)) {
6637 if (state
->stage
== MESA_SHADER_FRAGMENT
&&
6638 var
->data
.mode
== ir_var_shader_out
) {
6639 user_defined_fs_output_assigned
= true;
6640 user_defined_fs_output
= var
;
6645 /* From the GLSL 1.30 spec:
6647 * "If a shader statically assigns a value to gl_FragColor, it
6648 * may not assign a value to any element of gl_FragData. If a
6649 * shader statically writes a value to any element of
6650 * gl_FragData, it may not assign a value to
6651 * gl_FragColor. That is, a shader may assign values to either
6652 * gl_FragColor or gl_FragData, but not both. Multiple shaders
6653 * linked together must also consistently write just one of
6654 * these variables. Similarly, if user declared output
6655 * variables are in use (statically assigned to), then the
6656 * built-in variables gl_FragColor and gl_FragData may not be
6657 * assigned to. These incorrect usages all generate compile
6660 if (gl_FragColor_assigned
&& gl_FragData_assigned
) {
6661 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6662 "`gl_FragColor' and `gl_FragData'");
6663 } else if (gl_FragColor_assigned
&& user_defined_fs_output_assigned
) {
6664 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6665 "`gl_FragColor' and `%s'",
6666 user_defined_fs_output
->name
);
6667 } else if (gl_FragData_assigned
&& user_defined_fs_output_assigned
) {
6668 _mesa_glsl_error(&loc
, state
, "fragment shader writes to both "
6669 "`gl_FragData' and `%s'",
6670 user_defined_fs_output
->name
);
6676 remove_per_vertex_blocks(exec_list
*instructions
,
6677 _mesa_glsl_parse_state
*state
, ir_variable_mode mode
)
6679 /* Find the gl_PerVertex interface block of the appropriate (in/out) mode,
6680 * if it exists in this shader type.
6682 const glsl_type
*per_vertex
= NULL
;
6684 case ir_var_shader_in
:
6685 if (ir_variable
*gl_in
= state
->symbols
->get_variable("gl_in"))
6686 per_vertex
= gl_in
->get_interface_type();
6688 case ir_var_shader_out
:
6689 if (ir_variable
*gl_Position
=
6690 state
->symbols
->get_variable("gl_Position")) {
6691 per_vertex
= gl_Position
->get_interface_type();
6695 assert(!"Unexpected mode");
6699 /* If we didn't find a built-in gl_PerVertex interface block, then we don't
6700 * need to do anything.
6702 if (per_vertex
== NULL
)
6705 /* If the interface block is used by the shader, then we don't need to do
6708 interface_block_usage_visitor
v(mode
, per_vertex
);
6709 v
.run(instructions
);
6710 if (v
.usage_found())
6713 /* Remove any ir_variable declarations that refer to the interface block
6716 foreach_in_list_safe(ir_instruction
, node
, instructions
) {
6717 ir_variable
*const var
= node
->as_variable();
6718 if (var
!= NULL
&& var
->get_interface_type() == per_vertex
&&
6719 var
->data
.mode
== mode
) {
6720 state
->symbols
->disable_variable(var
->name
);