3 * Copyright © 2010 Intel Corporation
5 * Permission is hereby granted, free of charge, to any person obtaining a
6 * copy of this software and associated documentation files (the "Software"),
7 * to deal in the Software without restriction, including without limitation
8 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
9 * and/or sell copies of the Software, and to permit persons to whom the
10 * Software is furnished to do so, subject to the following conditions:
12 * The above copyright notice and this permission notice (including the next
13 * paragraph) shall be included in all copies or substantial portions of the
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
17 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
18 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
19 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
20 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
21 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
22 * DEALINGS IN THE SOFTWARE.
33 #include "glsl_types.h"
35 #include "ir_visitor.h"
36 #include "ir_hierarchical_visitor.h"
37 #include "main/mtypes.h"
42 * \defgroup IR Intermediate representation nodes
50 * Each concrete class derived from \c ir_instruction has a value in this
51 * enumerant. The value for the type is stored in \c ir_instruction::ir_type
52 * by the constructor. While using type tags is not very C++, it is extremely
53 * convenient. For example, during debugging you can simply inspect
54 * \c ir_instruction::ir_type to find out the actual type of the object.
56 * In addition, it is possible to use a switch-statement based on \c
57 * \c ir_instruction::ir_type to select different behavior for different object
58 * types. For functions that have only slight differences for several object
59 * types, this allows writing very straightforward, readable code.
63 * Zero is unused so that the IR validator can detect cases where
64 * \c ir_instruction::ir_type has not been initialized.
71 ir_type_dereference_array
,
72 ir_type_dereference_record
,
73 ir_type_dereference_variable
,
77 ir_type_function_signature
,
85 ir_type_end_primitive
,
86 ir_type_max
/**< maximum ir_type enum number, for validation */
90 * Base class of all IR instructions
92 class ir_instruction
: public exec_node
{
94 enum ir_node_type ir_type
;
97 * GCC 4.7+ and clang warn when deleting an ir_instruction unless
98 * there's a virtual destructor present. Because we almost
99 * universally use ralloc for our memory management of
100 * ir_instructions, the destructor doesn't need to do any work.
102 virtual ~ir_instruction()
106 /** ir_print_visitor helper for debugging. */
107 void print(void) const;
109 virtual void accept(ir_visitor
*) = 0;
110 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*) = 0;
111 virtual ir_instruction
*clone(void *mem_ctx
,
112 struct hash_table
*ht
) const = 0;
115 * \name IR instruction downcast functions
117 * These functions either cast the object to a derived class or return
118 * \c NULL if the object's type does not match the specified derived class.
119 * Additional downcast functions will be added as needed.
122 virtual class ir_variable
* as_variable() { return NULL
; }
123 virtual class ir_function
* as_function() { return NULL
; }
124 virtual class ir_dereference
* as_dereference() { return NULL
; }
125 virtual class ir_dereference_array
* as_dereference_array() { return NULL
; }
126 virtual class ir_dereference_variable
*as_dereference_variable() { return NULL
; }
127 virtual class ir_dereference_record
*as_dereference_record() { return NULL
; }
128 virtual class ir_expression
* as_expression() { return NULL
; }
129 virtual class ir_rvalue
* as_rvalue() { return NULL
; }
130 virtual class ir_loop
* as_loop() { return NULL
; }
131 virtual class ir_assignment
* as_assignment() { return NULL
; }
132 virtual class ir_call
* as_call() { return NULL
; }
133 virtual class ir_return
* as_return() { return NULL
; }
134 virtual class ir_if
* as_if() { return NULL
; }
135 virtual class ir_swizzle
* as_swizzle() { return NULL
; }
136 virtual class ir_constant
* as_constant() { return NULL
; }
137 virtual class ir_discard
* as_discard() { return NULL
; }
138 virtual class ir_jump
* as_jump() { return NULL
; }
144 ir_type
= ir_type_unset
;
150 * The base class for all "values"/expression trees.
152 class ir_rvalue
: public ir_instruction
{
154 const struct glsl_type
*type
;
156 virtual ir_rvalue
*clone(void *mem_ctx
, struct hash_table
*) const;
158 virtual void accept(ir_visitor
*v
)
163 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
165 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
167 virtual ir_rvalue
* as_rvalue()
172 ir_rvalue
*as_rvalue_to_saturate();
174 virtual bool is_lvalue() const
180 * Get the variable that is ultimately referenced by an r-value
182 virtual ir_variable
*variable_referenced() const
189 * If an r-value is a reference to a whole variable, get that variable
192 * Pointer to a variable that is completely dereferenced by the r-value. If
193 * the r-value is not a dereference or the dereference does not access the
194 * entire variable (i.e., it's just one array element, struct field), \c NULL
197 virtual ir_variable
*whole_variable_referenced()
203 * Determine if an r-value has the value zero
205 * The base implementation of this function always returns \c false. The
206 * \c ir_constant class over-rides this function to return \c true \b only
207 * for vector and scalar types that have all elements set to the value
208 * zero (or \c false for booleans).
210 * \sa ir_constant::has_value, ir_rvalue::is_one, ir_rvalue::is_negative_one,
211 * ir_constant::is_basis
213 virtual bool is_zero() const;
216 * Determine if an r-value has the value one
218 * The base implementation of this function always returns \c false. The
219 * \c ir_constant class over-rides this function to return \c true \b only
220 * for vector and scalar types that have all elements set to the value
221 * one (or \c true for booleans).
223 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_negative_one,
224 * ir_constant::is_basis
226 virtual bool is_one() const;
229 * Determine if an r-value has the value negative one
231 * The base implementation of this function always returns \c false. The
232 * \c ir_constant class over-rides this function to return \c true \b only
233 * for vector and scalar types that have all elements set to the value
234 * negative one. For boolean types, the result is always \c false.
236 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one
237 * ir_constant::is_basis
239 virtual bool is_negative_one() const;
242 * Determine if an r-value is a basis vector
244 * The base implementation of this function always returns \c false. The
245 * \c ir_constant class over-rides this function to return \c true \b only
246 * for vector and scalar types that have one element set to the value one,
247 * and the other elements set to the value zero. For boolean types, the
248 * result is always \c false.
250 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one,
251 * is_constant::is_negative_one
253 virtual bool is_basis() const;
257 * Return a generic value of error_type.
259 * Allocation will be performed with 'mem_ctx' as ralloc owner.
261 static ir_rvalue
*error_value(void *mem_ctx
);
269 * Variable storage classes
271 enum ir_variable_mode
{
272 ir_var_auto
= 0, /**< Function local variables and globals. */
273 ir_var_uniform
, /**< Variable declared as a uniform. */
278 ir_var_function_inout
,
279 ir_var_const_in
, /**< "in" param that must be a constant expression */
280 ir_var_system_value
, /**< Ex: front-face, instance-id, etc. */
281 ir_var_temporary
, /**< Temporary variable generated during compilation. */
282 ir_var_mode_count
/**< Number of variable modes */
286 * \brief Layout qualifiers for gl_FragDepth.
288 * The AMD/ARB_conservative_depth extensions allow gl_FragDepth to be redeclared
289 * with a layout qualifier.
291 enum ir_depth_layout
{
292 ir_depth_layout_none
, /**< No depth layout is specified. */
294 ir_depth_layout_greater
,
295 ir_depth_layout_less
,
296 ir_depth_layout_unchanged
300 * \brief Convert depth layout qualifier to string.
303 depth_layout_string(ir_depth_layout layout
);
306 * Description of built-in state associated with a uniform
308 * \sa ir_variable::state_slots
310 struct ir_state_slot
{
315 class ir_variable
: public ir_instruction
{
317 ir_variable(const struct glsl_type
*, const char *, ir_variable_mode
);
319 virtual ir_variable
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
321 virtual ir_variable
*as_variable()
326 virtual void accept(ir_visitor
*v
)
331 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
335 * Get the string value for the interpolation qualifier
337 * \return The string that would be used in a shader to specify \c
338 * mode will be returned.
340 * This function is used to generate error messages of the form "shader
341 * uses %s interpolation qualifier", so in the case where there is no
342 * interpolation qualifier, it returns "no".
344 * This function should only be used on a shader input or output variable.
346 const char *interpolation_string() const;
349 * Determine how this variable should be interpolated based on its
350 * interpolation qualifier (if present), whether it is gl_Color or
351 * gl_SecondaryColor, and whether flatshading is enabled in the current GL
354 * The return value will always be either INTERP_QUALIFIER_SMOOTH,
355 * INTERP_QUALIFIER_NOPERSPECTIVE, or INTERP_QUALIFIER_FLAT.
357 glsl_interp_qualifier
determine_interpolation_mode(bool flat_shade
);
360 * Determine whether or not a variable is part of a uniform block.
362 inline bool is_in_uniform_block() const
364 return this->mode
== ir_var_uniform
&& this->interface_type
!= NULL
;
368 * Determine whether or not a variable is the declaration of an interface
371 * For the first declaration below, there will be an \c ir_variable named
372 * "instance" whose type and whose instance_type will be the same
373 * \cglsl_type. For the second declaration, there will be an \c ir_variable
374 * named "f" whose type is float and whose instance_type is B2.
376 * "instance" is an interface instance variable, but "f" is not.
386 inline bool is_interface_instance() const
388 const glsl_type
*const t
= this->type
;
390 return (t
== this->interface_type
)
391 || (t
->is_array() && t
->fields
.array
== this->interface_type
);
395 * Set this->interface_type on a newly created variable.
397 void init_interface_type(const struct glsl_type
*type
)
399 assert(this->interface_type
== NULL
);
400 this->interface_type
= type
;
401 if (this->is_interface_instance()) {
402 this->max_ifc_array_access
=
403 rzalloc_array(this, unsigned, type
->length
);
408 * Change this->interface_type on a variable that previously had a
409 * different, but compatible, interface_type. This is used during linking
410 * to set the size of arrays in interface blocks.
412 void change_interface_type(const struct glsl_type
*type
)
414 if (this->max_ifc_array_access
!= NULL
) {
415 /* max_ifc_array_access has already been allocated, so make sure the
416 * new interface has the same number of fields as the old one.
418 assert(this->interface_type
->length
== type
->length
);
420 this->interface_type
= type
;
423 const glsl_type
*get_interface_type() const
425 return this->interface_type
;
429 * Declared type of the variable
431 const struct glsl_type
*type
;
434 * Declared name of the variable
439 * Highest element accessed with a constant expression array index
441 * Not used for non-array variables.
443 unsigned max_array_access
;
446 * For variables which satisfy the is_interface_instance() predicate, this
447 * points to an array of integers such that if the ith member of the
448 * interface block is an array, max_ifc_array_access[i] is the maximum
449 * array element of that member that has been accessed. If the ith member
450 * of the interface block is not an array, max_ifc_array_access[i] is
453 * For variables whose type is not an interface block, this pointer is
456 unsigned *max_ifc_array_access
;
459 * Is the variable read-only?
461 * This is set for variables declared as \c const, shader inputs,
464 unsigned read_only
:1;
466 unsigned invariant
:1;
469 * Has this variable been used for reading or writing?
471 * Several GLSL semantic checks require knowledge of whether or not a
472 * variable has been used. For example, it is an error to redeclare a
473 * variable as invariant after it has been used.
475 * This is only maintained in the ast_to_hir.cpp path, not in
476 * Mesa's fixed function or ARB program paths.
481 * Has this variable been statically assigned?
483 * This answers whether the variable was assigned in any path of
484 * the shader during ast_to_hir. This doesn't answer whether it is
485 * still written after dead code removal, nor is it maintained in
486 * non-ast_to_hir.cpp (GLSL parsing) paths.
491 * Storage class of the variable.
493 * \sa ir_variable_mode
498 * Interpolation mode for shader inputs / outputs
500 * \sa ir_variable_interpolation
502 unsigned interpolation
:2;
505 * \name ARB_fragment_coord_conventions
508 unsigned origin_upper_left
:1;
509 unsigned pixel_center_integer
:1;
513 * Was the location explicitly set in the shader?
515 * If the location is explicitly set in the shader, it \b cannot be changed
516 * by the linker or by the API (e.g., calls to \c glBindAttribLocation have
519 unsigned explicit_location
:1;
520 unsigned explicit_index
:1;
523 * Was an initial binding explicitly set in the shader?
525 * If so, constant_value contains an integer ir_constant representing the
526 * initial binding point.
528 unsigned explicit_binding
:1;
531 * Does this variable have an initializer?
533 * This is used by the linker to cross-validiate initializers of global
536 unsigned has_initializer
:1;
539 * Is this variable a generic output or input that has not yet been matched
540 * up to a variable in another stage of the pipeline?
542 * This is used by the linker as scratch storage while assigning locations
543 * to generic inputs and outputs.
545 unsigned is_unmatched_generic_inout
:1;
548 * If non-zero, then this variable may be packed along with other variables
549 * into a single varying slot, so this offset should be applied when
550 * accessing components. For example, an offset of 1 means that the x
551 * component of this variable is actually stored in component y of the
552 * location specified by \c location.
554 unsigned location_frac
:2;
557 * \brief Layout qualifier for gl_FragDepth.
559 * This is not equal to \c ir_depth_layout_none if and only if this
560 * variable is \c gl_FragDepth and a layout qualifier is specified.
562 ir_depth_layout depth_layout
;
565 * Storage location of the base of this variable
567 * The precise meaning of this field depends on the nature of the variable.
569 * - Vertex shader input: one of the values from \c gl_vert_attrib.
570 * - Vertex shader output: one of the values from \c gl_varying_slot.
571 * - Geometry shader input: one of the values from \c gl_varying_slot.
572 * - Geometry shader output: one of the values from \c gl_varying_slot.
573 * - Fragment shader input: one of the values from \c gl_varying_slot.
574 * - Fragment shader output: one of the values from \c gl_frag_result.
575 * - Uniforms: Per-stage uniform slot number for default uniform block.
576 * - Uniforms: Index within the uniform block definition for UBO members.
577 * - Other: This field is not currently used.
579 * If the variable is a uniform, shader input, or shader output, and the
580 * slot has not been assigned, the value will be -1.
585 * output index for dual source blending.
590 * Initial binding point for a sampler or UBO.
592 * For array types, this represents the binding point for the first element.
597 * Built-in state that backs this uniform
599 * Once set at variable creation, \c state_slots must remain invariant.
600 * This is because, ideally, this array would be shared by all clones of
601 * this variable in the IR tree. In other words, we'd really like for it
602 * to be a fly-weight.
604 * If the variable is not a uniform, \c num_state_slots will be zero and
605 * \c state_slots will be \c NULL.
608 unsigned num_state_slots
; /**< Number of state slots used */
609 ir_state_slot
*state_slots
; /**< State descriptors. */
613 * Emit a warning if this variable is accessed.
615 const char *warn_extension
;
618 * Value assigned in the initializer of a variable declared "const"
620 ir_constant
*constant_value
;
623 * Constant expression assigned in the initializer of the variable
626 * This field and \c ::constant_value are distinct. Even if the two fields
627 * refer to constants with the same value, they must point to separate
630 ir_constant
*constant_initializer
;
634 * For variables that are in an interface block or are an instance of an
635 * interface block, this is the \c GLSL_TYPE_INTERFACE type for that block.
637 * \sa ir_variable::location
639 const glsl_type
*interface_type
;
643 * A function that returns whether a built-in function is available in the
644 * current shading language (based on version, ES or desktop, and extensions).
646 typedef bool (*builtin_available_predicate
)(const _mesa_glsl_parse_state
*);
650 * The representation of a function instance; may be the full definition or
651 * simply a prototype.
653 class ir_function_signature
: public ir_instruction
{
654 /* An ir_function_signature will be part of the list of signatures in
658 ir_function_signature(const glsl_type
*return_type
,
659 builtin_available_predicate builtin_avail
= NULL
);
661 virtual ir_function_signature
*clone(void *mem_ctx
,
662 struct hash_table
*ht
) const;
663 ir_function_signature
*clone_prototype(void *mem_ctx
,
664 struct hash_table
*ht
) const;
666 virtual void accept(ir_visitor
*v
)
671 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
674 * Attempt to evaluate this function as a constant expression,
675 * given a list of the actual parameters and the variable context.
676 * Returns NULL for non-built-ins.
678 ir_constant
*constant_expression_value(exec_list
*actual_parameters
, struct hash_table
*variable_context
);
681 * Get the name of the function for which this is a signature
683 const char *function_name() const;
686 * Get a handle to the function for which this is a signature
688 * There is no setter function, this function returns a \c const pointer,
689 * and \c ir_function_signature::_function is private for a reason. The
690 * only way to make a connection between a function and function signature
691 * is via \c ir_function::add_signature. This helps ensure that certain
692 * invariants (i.e., a function signature is in the list of signatures for
693 * its \c _function) are met.
695 * \sa ir_function::add_signature
697 inline const class ir_function
*function() const
699 return this->_function
;
703 * Check whether the qualifiers match between this signature's parameters
704 * and the supplied parameter list. If not, returns the name of the first
705 * parameter with mismatched qualifiers (for use in error messages).
707 const char *qualifiers_match(exec_list
*params
);
710 * Replace the current parameter list with the given one. This is useful
711 * if the current information came from a prototype, and either has invalid
712 * or missing parameter names.
714 void replace_parameters(exec_list
*new_params
);
717 * Function return type.
719 * \note This discards the optional precision qualifier.
721 const struct glsl_type
*return_type
;
724 * List of ir_variable of function parameters.
726 * This represents the storage. The paramaters passed in a particular
727 * call will be in ir_call::actual_paramaters.
729 struct exec_list parameters
;
731 /** Whether or not this function has a body (which may be empty). */
732 unsigned is_defined
:1;
734 /** Whether or not this function signature is a built-in. */
735 bool is_builtin() const;
737 /** Whether or not a built-in is available for this shader. */
738 bool is_builtin_available(const _mesa_glsl_parse_state
*state
) const;
740 /** Body of instructions in the function. */
741 struct exec_list body
;
745 * A function pointer to a predicate that answers whether a built-in
746 * function is available in the current shader. NULL if not a built-in.
748 builtin_available_predicate builtin_avail
;
750 /** Function of which this signature is one overload. */
751 class ir_function
*_function
;
753 /** Function signature of which this one is a prototype clone */
754 const ir_function_signature
*origin
;
756 friend class ir_function
;
759 * Helper function to run a list of instructions for constant
760 * expression evaluation.
762 * The hash table represents the values of the visible variables.
763 * There are no scoping issues because the table is indexed on
764 * ir_variable pointers, not variable names.
766 * Returns false if the expression is not constant, true otherwise,
767 * and the value in *result if result is non-NULL.
769 bool constant_expression_evaluate_expression_list(const struct exec_list
&body
,
770 struct hash_table
*variable_context
,
771 ir_constant
**result
);
776 * Header for tracking multiple overloaded functions with the same name.
777 * Contains a list of ir_function_signatures representing each of the
780 class ir_function
: public ir_instruction
{
782 ir_function(const char *name
);
784 virtual ir_function
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
786 virtual ir_function
*as_function()
791 virtual void accept(ir_visitor
*v
)
796 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
798 void add_signature(ir_function_signature
*sig
)
800 sig
->_function
= this;
801 this->signatures
.push_tail(sig
);
805 * Get an iterator for the set of function signatures
807 exec_list_iterator
iterator()
809 return signatures
.iterator();
813 * Find a signature that matches a set of actual parameters, taking implicit
814 * conversions into account. Also flags whether the match was exact.
816 ir_function_signature
*matching_signature(_mesa_glsl_parse_state
*state
,
817 const exec_list
*actual_param
,
818 bool *match_is_exact
);
821 * Find a signature that matches a set of actual parameters, taking implicit
822 * conversions into account.
824 ir_function_signature
*matching_signature(_mesa_glsl_parse_state
*state
,
825 const exec_list
*actual_param
);
828 * Find a signature that exactly matches a set of actual parameters without
829 * any implicit type conversions.
831 ir_function_signature
*exact_matching_signature(_mesa_glsl_parse_state
*state
,
832 const exec_list
*actual_ps
);
835 * Name of the function.
839 /** Whether or not this function has a signature that isn't a built-in. */
840 bool has_user_signature();
843 * List of ir_function_signature for each overloaded function with this name.
845 struct exec_list signatures
;
848 inline const char *ir_function_signature::function_name() const
850 return this->_function
->name
;
856 * IR instruction representing high-level if-statements
858 class ir_if
: public ir_instruction
{
860 ir_if(ir_rvalue
*condition
)
861 : condition(condition
)
863 ir_type
= ir_type_if
;
866 virtual ir_if
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
868 virtual ir_if
*as_if()
873 virtual void accept(ir_visitor
*v
)
878 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
880 ir_rvalue
*condition
;
881 /** List of ir_instruction for the body of the then branch */
882 exec_list then_instructions
;
883 /** List of ir_instruction for the body of the else branch */
884 exec_list else_instructions
;
889 * IR instruction representing a high-level loop structure.
891 class ir_loop
: public ir_instruction
{
895 virtual ir_loop
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
897 virtual void accept(ir_visitor
*v
)
902 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
904 virtual ir_loop
*as_loop()
910 * Get an iterator for the instructions of the loop body
912 exec_list_iterator
iterator()
914 return body_instructions
.iterator();
917 /** List of ir_instruction that make up the body of the loop. */
918 exec_list body_instructions
;
921 * \name Loop counter and controls
923 * Represents a loop like a FORTRAN \c do-loop.
926 * If \c from and \c to are the same value, the loop will execute once.
929 ir_rvalue
*from
; /** Value of the loop counter on the first
930 * iteration of the loop.
932 ir_rvalue
*to
; /** Value of the loop counter on the last
933 * iteration of the loop.
935 ir_rvalue
*increment
;
936 ir_variable
*counter
;
939 * Comparison operation in the loop terminator.
941 * If any of the loop control fields are non-\c NULL, this field must be
942 * one of \c ir_binop_less, \c ir_binop_greater, \c ir_binop_lequal,
943 * \c ir_binop_gequal, \c ir_binop_equal, or \c ir_binop_nequal.
950 class ir_assignment
: public ir_instruction
{
952 ir_assignment(ir_rvalue
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
= NULL
);
955 * Construct an assignment with an explicit write mask
958 * Since a write mask is supplied, the LHS must already be a bare
959 * \c ir_dereference. The cannot be any swizzles in the LHS.
961 ir_assignment(ir_dereference
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
,
962 unsigned write_mask
);
964 virtual ir_assignment
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
966 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
968 virtual void accept(ir_visitor
*v
)
973 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
975 virtual ir_assignment
* as_assignment()
981 * Get a whole variable written by an assignment
983 * If the LHS of the assignment writes a whole variable, the variable is
984 * returned. Otherwise \c NULL is returned. Examples of whole-variable
987 * - Assigning to a scalar
988 * - Assigning to all components of a vector
989 * - Whole array (or matrix) assignment
990 * - Whole structure assignment
992 ir_variable
*whole_variable_written();
995 * Set the LHS of an assignment
997 void set_lhs(ir_rvalue
*lhs
);
1000 * Left-hand side of the assignment.
1002 * This should be treated as read only. If you need to set the LHS of an
1003 * assignment, use \c ir_assignment::set_lhs.
1005 ir_dereference
*lhs
;
1008 * Value being assigned
1013 * Optional condition for the assignment.
1015 ir_rvalue
*condition
;
1019 * Component mask written
1021 * For non-vector types in the LHS, this field will be zero. For vector
1022 * types, a bit will be set for each component that is written. Note that
1023 * for \c vec2 and \c vec3 types only the lower bits will ever be set.
1025 * A partially-set write mask means that each enabled channel gets
1026 * the value from a consecutive channel of the rhs. For example,
1027 * to write just .xyw of gl_FrontColor with color:
1029 * (assign (constant bool (1)) (xyw)
1030 * (var_ref gl_FragColor)
1031 * (swiz xyw (var_ref color)))
1033 unsigned write_mask
:4;
1036 /* Update ir_expression::get_num_operands() and operator_strs when
1037 * updating this list.
1039 enum ir_expression_operation
{
1048 ir_unop_exp
, /**< Log base e on gentype */
1049 ir_unop_log
, /**< Natural log on gentype */
1052 ir_unop_f2i
, /**< Float-to-integer conversion. */
1053 ir_unop_f2u
, /**< Float-to-unsigned conversion. */
1054 ir_unop_i2f
, /**< Integer-to-float conversion. */
1055 ir_unop_f2b
, /**< Float-to-boolean conversion */
1056 ir_unop_b2f
, /**< Boolean-to-float conversion */
1057 ir_unop_i2b
, /**< int-to-boolean conversion */
1058 ir_unop_b2i
, /**< Boolean-to-int conversion */
1059 ir_unop_u2f
, /**< Unsigned-to-float conversion. */
1060 ir_unop_i2u
, /**< Integer-to-unsigned conversion. */
1061 ir_unop_u2i
, /**< Unsigned-to-integer conversion. */
1062 ir_unop_bitcast_i2f
, /**< Bit-identical int-to-float "conversion" */
1063 ir_unop_bitcast_f2i
, /**< Bit-identical float-to-int "conversion" */
1064 ir_unop_bitcast_u2f
, /**< Bit-identical uint-to-float "conversion" */
1065 ir_unop_bitcast_f2u
, /**< Bit-identical float-to-uint "conversion" */
1069 * \name Unary floating-point rounding operations.
1080 * \name Trigonometric operations.
1085 ir_unop_sin_reduced
, /**< Reduced range sin. [-pi, pi] */
1086 ir_unop_cos_reduced
, /**< Reduced range cos. [-pi, pi] */
1090 * \name Partial derivatives.
1098 * \name Floating point pack and unpack operations.
1101 ir_unop_pack_snorm_2x16
,
1102 ir_unop_pack_snorm_4x8
,
1103 ir_unop_pack_unorm_2x16
,
1104 ir_unop_pack_unorm_4x8
,
1105 ir_unop_pack_half_2x16
,
1106 ir_unop_unpack_snorm_2x16
,
1107 ir_unop_unpack_snorm_4x8
,
1108 ir_unop_unpack_unorm_2x16
,
1109 ir_unop_unpack_unorm_4x8
,
1110 ir_unop_unpack_half_2x16
,
1114 * \name Lowered floating point unpacking operations.
1116 * \see lower_packing_builtins_visitor::split_unpack_half_2x16
1119 ir_unop_unpack_half_2x16_split_x
,
1120 ir_unop_unpack_half_2x16_split_y
,
1124 * \name Bit operations, part of ARB_gpu_shader5.
1127 ir_unop_bitfield_reverse
,
1136 * A sentinel marking the last of the unary operations.
1138 ir_last_unop
= ir_unop_noise
,
1142 ir_binop_mul
, /**< Floating-point or low 32-bit integer multiply. */
1143 ir_binop_imul_high
, /**< Calculates the high 32-bits of a 64-bit multiply. */
1147 * Returns the carry resulting from the addition of the two arguments.
1154 * Returns the borrow resulting from the subtraction of the second argument
1155 * from the first argument.
1162 * Takes one of two combinations of arguments:
1165 * - mod(vecN, float)
1167 * Does not take integer types.
1172 * \name Binary comparison operators which return a boolean vector.
1173 * The type of both operands must be equal.
1183 * Returns single boolean for whether all components of operands[0]
1184 * equal the components of operands[1].
1188 * Returns single boolean for whether any component of operands[0]
1189 * is not equal to the corresponding component of operands[1].
1191 ir_binop_any_nequal
,
1195 * \name Bit-wise binary operations.
1216 * \name Lowered floating point packing operations.
1218 * \see lower_packing_builtins_visitor::split_pack_half_2x16
1221 ir_binop_pack_half_2x16_split
,
1225 * \name First half of a lowered bitfieldInsert() operation.
1227 * \see lower_instructions::bitfield_insert_to_bfm_bfi
1234 * Load a value the size of a given GLSL type from a uniform block.
1236 * operand0 is the ir_constant uniform block index in the linked shader.
1237 * operand1 is a byte offset within the uniform block.
1242 * \name Multiplies a number by two to a power, part of ARB_gpu_shader5.
1249 * Extract a scalar from a vector
1251 * operand0 is the vector
1252 * operand1 is the index of the field to read from operand0
1254 ir_binop_vector_extract
,
1257 * A sentinel marking the last of the binary operations.
1259 ir_last_binop
= ir_binop_vector_extract
,
1262 * \name Fused floating-point multiply-add, part of ARB_gpu_shader5.
1271 * \name Conditional Select
1273 * A vector conditional select instruction (like ?:, but operating per-
1274 * component on vectors).
1276 * \see lower_instructions_visitor::ldexp_to_arith
1283 * \name Second half of a lowered bitfieldInsert() operation.
1285 * \see lower_instructions::bitfield_insert_to_bfm_bfi
1291 ir_triop_bitfield_extract
,
1294 * Generate a value with one field of a vector changed
1296 * operand0 is the vector
1297 * operand1 is the value to write into the vector result
1298 * operand2 is the index in operand0 to be modified
1300 ir_triop_vector_insert
,
1303 * A sentinel marking the last of the ternary operations.
1305 ir_last_triop
= ir_triop_vector_insert
,
1307 ir_quadop_bitfield_insert
,
1312 * A sentinel marking the last of the ternary operations.
1314 ir_last_quadop
= ir_quadop_vector
,
1317 * A sentinel marking the last of all operations.
1319 ir_last_opcode
= ir_quadop_vector
1322 class ir_expression
: public ir_rvalue
{
1324 ir_expression(int op
, const struct glsl_type
*type
,
1325 ir_rvalue
*op0
, ir_rvalue
*op1
= NULL
,
1326 ir_rvalue
*op2
= NULL
, ir_rvalue
*op3
= NULL
);
1329 * Constructor for unary operation expressions
1331 ir_expression(int op
, ir_rvalue
*);
1334 * Constructor for binary operation expressions
1336 ir_expression(int op
, ir_rvalue
*op0
, ir_rvalue
*op1
);
1339 * Constructor for ternary operation expressions
1341 ir_expression(int op
, ir_rvalue
*op0
, ir_rvalue
*op1
, ir_rvalue
*op2
);
1343 virtual ir_expression
*as_expression()
1348 virtual ir_expression
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1351 * Attempt to constant-fold the expression
1353 * The "variable_context" hash table links ir_variable * to ir_constant *
1354 * that represent the variables' values. \c NULL represents an empty
1357 * If the expression cannot be constant folded, this method will return
1360 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1363 * Determine the number of operands used by an expression
1365 static unsigned int get_num_operands(ir_expression_operation
);
1368 * Determine the number of operands used by an expression
1370 unsigned int get_num_operands() const
1372 return (this->operation
== ir_quadop_vector
)
1373 ? this->type
->vector_elements
: get_num_operands(operation
);
1377 * Return a string representing this expression's operator.
1379 const char *operator_string();
1382 * Return a string representing this expression's operator.
1384 static const char *operator_string(ir_expression_operation
);
1388 * Do a reverse-lookup to translate the given string into an operator.
1390 static ir_expression_operation
get_operator(const char *);
1392 virtual void accept(ir_visitor
*v
)
1397 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1399 ir_expression_operation operation
;
1400 ir_rvalue
*operands
[4];
1405 * HIR instruction representing a high-level function call, containing a list
1406 * of parameters and returning a value in the supplied temporary.
1408 class ir_call
: public ir_instruction
{
1410 ir_call(ir_function_signature
*callee
,
1411 ir_dereference_variable
*return_deref
,
1412 exec_list
*actual_parameters
)
1413 : return_deref(return_deref
), callee(callee
)
1415 ir_type
= ir_type_call
;
1416 assert(callee
->return_type
!= NULL
);
1417 actual_parameters
->move_nodes_to(& this->actual_parameters
);
1418 this->use_builtin
= callee
->is_builtin();
1421 virtual ir_call
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1423 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1425 virtual ir_call
*as_call()
1430 virtual void accept(ir_visitor
*v
)
1435 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1438 * Get an iterator for the set of acutal parameters
1440 exec_list_iterator
iterator()
1442 return actual_parameters
.iterator();
1446 * Get the name of the function being called.
1448 const char *callee_name() const
1450 return callee
->function_name();
1454 * Generates an inline version of the function before @ir,
1455 * storing the return value in return_deref.
1457 void generate_inline(ir_instruction
*ir
);
1460 * Storage for the function's return value.
1461 * This must be NULL if the return type is void.
1463 ir_dereference_variable
*return_deref
;
1466 * The specific function signature being called.
1468 ir_function_signature
*callee
;
1470 /* List of ir_rvalue of paramaters passed in this call. */
1471 exec_list actual_parameters
;
1473 /** Should this call only bind to a built-in function? */
1479 * \name Jump-like IR instructions.
1481 * These include \c break, \c continue, \c return, and \c discard.
1484 class ir_jump
: public ir_instruction
{
1488 ir_type
= ir_type_unset
;
1492 virtual ir_jump
*as_jump()
1498 class ir_return
: public ir_jump
{
1503 this->ir_type
= ir_type_return
;
1506 ir_return(ir_rvalue
*value
)
1509 this->ir_type
= ir_type_return
;
1512 virtual ir_return
*clone(void *mem_ctx
, struct hash_table
*) const;
1514 virtual ir_return
*as_return()
1519 ir_rvalue
*get_value() const
1524 virtual void accept(ir_visitor
*v
)
1529 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1536 * Jump instructions used inside loops
1538 * These include \c break and \c continue. The \c break within a loop is
1539 * different from the \c break within a switch-statement.
1541 * \sa ir_switch_jump
1543 class ir_loop_jump
: public ir_jump
{
1550 ir_loop_jump(jump_mode mode
)
1552 this->ir_type
= ir_type_loop_jump
;
1556 virtual ir_loop_jump
*clone(void *mem_ctx
, struct hash_table
*) const;
1558 virtual void accept(ir_visitor
*v
)
1563 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1565 bool is_break() const
1567 return mode
== jump_break
;
1570 bool is_continue() const
1572 return mode
== jump_continue
;
1575 /** Mode selector for the jump instruction. */
1576 enum jump_mode mode
;
1580 * IR instruction representing discard statements.
1582 class ir_discard
: public ir_jump
{
1586 this->ir_type
= ir_type_discard
;
1587 this->condition
= NULL
;
1590 ir_discard(ir_rvalue
*cond
)
1592 this->ir_type
= ir_type_discard
;
1593 this->condition
= cond
;
1596 virtual ir_discard
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1598 virtual void accept(ir_visitor
*v
)
1603 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1605 virtual ir_discard
*as_discard()
1610 ir_rvalue
*condition
;
1616 * Texture sampling opcodes used in ir_texture
1618 enum ir_texture_opcode
{
1619 ir_tex
, /**< Regular texture look-up */
1620 ir_txb
, /**< Texture look-up with LOD bias */
1621 ir_txl
, /**< Texture look-up with explicit LOD */
1622 ir_txd
, /**< Texture look-up with partial derivatvies */
1623 ir_txf
, /**< Texel fetch with explicit LOD */
1624 ir_txf_ms
, /**< Multisample texture fetch */
1625 ir_txs
, /**< Texture size */
1626 ir_lod
, /**< Texture lod query */
1627 ir_tg4
, /**< Texture gather */
1628 ir_query_levels
/**< Texture levels query */
1633 * IR instruction to sample a texture
1635 * The specific form of the IR instruction depends on the \c mode value
1636 * selected from \c ir_texture_opcodes. In the printed IR, these will
1639 * Texel offset (0 or an expression)
1640 * | Projection divisor
1641 * | | Shadow comparitor
1644 * (tex <type> <sampler> <coordinate> 0 1 ( ))
1645 * (txb <type> <sampler> <coordinate> 0 1 ( ) <bias>)
1646 * (txl <type> <sampler> <coordinate> 0 1 ( ) <lod>)
1647 * (txd <type> <sampler> <coordinate> 0 1 ( ) (dPdx dPdy))
1648 * (txf <type> <sampler> <coordinate> 0 <lod>)
1650 * <type> <sampler> <coordinate> <sample_index>)
1651 * (txs <type> <sampler> <lod>)
1652 * (lod <type> <sampler> <coordinate>)
1653 * (tg4 <type> <sampler> <coordinate> <offset> <component>)
1654 * (query_levels <type> <sampler>)
1656 class ir_texture
: public ir_rvalue
{
1658 ir_texture(enum ir_texture_opcode op
)
1659 : op(op
), sampler(NULL
), coordinate(NULL
), projector(NULL
),
1660 shadow_comparitor(NULL
), offset(NULL
)
1662 this->ir_type
= ir_type_texture
;
1663 memset(&lod_info
, 0, sizeof(lod_info
));
1666 virtual ir_texture
*clone(void *mem_ctx
, struct hash_table
*) const;
1668 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1670 virtual void accept(ir_visitor
*v
)
1675 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1678 * Return a string representing the ir_texture_opcode.
1680 const char *opcode_string();
1682 /** Set the sampler and type. */
1683 void set_sampler(ir_dereference
*sampler
, const glsl_type
*type
);
1686 * Do a reverse-lookup to translate a string into an ir_texture_opcode.
1688 static ir_texture_opcode
get_opcode(const char *);
1690 enum ir_texture_opcode op
;
1692 /** Sampler to use for the texture access. */
1693 ir_dereference
*sampler
;
1695 /** Texture coordinate to sample */
1696 ir_rvalue
*coordinate
;
1699 * Value used for projective divide.
1701 * If there is no projective divide (the common case), this will be
1702 * \c NULL. Optimization passes should check for this to point to a constant
1703 * of 1.0 and replace that with \c NULL.
1705 ir_rvalue
*projector
;
1708 * Coordinate used for comparison on shadow look-ups.
1710 * If there is no shadow comparison, this will be \c NULL. For the
1711 * \c ir_txf opcode, this *must* be \c NULL.
1713 ir_rvalue
*shadow_comparitor
;
1715 /** Texel offset. */
1719 ir_rvalue
*lod
; /**< Floating point LOD */
1720 ir_rvalue
*bias
; /**< Floating point LOD bias */
1721 ir_rvalue
*sample_index
; /**< MSAA sample index */
1722 ir_rvalue
*component
; /**< Gather component selector */
1724 ir_rvalue
*dPdx
; /**< Partial derivative of coordinate wrt X */
1725 ir_rvalue
*dPdy
; /**< Partial derivative of coordinate wrt Y */
1731 struct ir_swizzle_mask
{
1738 * Number of components in the swizzle.
1740 unsigned num_components
:3;
1743 * Does the swizzle contain duplicate components?
1745 * L-value swizzles cannot contain duplicate components.
1747 unsigned has_duplicates
:1;
1751 class ir_swizzle
: public ir_rvalue
{
1753 ir_swizzle(ir_rvalue
*, unsigned x
, unsigned y
, unsigned z
, unsigned w
,
1756 ir_swizzle(ir_rvalue
*val
, const unsigned *components
, unsigned count
);
1758 ir_swizzle(ir_rvalue
*val
, ir_swizzle_mask mask
);
1760 virtual ir_swizzle
*clone(void *mem_ctx
, struct hash_table
*) const;
1762 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1764 virtual ir_swizzle
*as_swizzle()
1770 * Construct an ir_swizzle from the textual representation. Can fail.
1772 static ir_swizzle
*create(ir_rvalue
*, const char *, unsigned vector_length
);
1774 virtual void accept(ir_visitor
*v
)
1779 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1781 bool is_lvalue() const
1783 return val
->is_lvalue() && !mask
.has_duplicates
;
1787 * Get the variable that is ultimately referenced by an r-value
1789 virtual ir_variable
*variable_referenced() const;
1792 ir_swizzle_mask mask
;
1796 * Initialize the mask component of a swizzle
1798 * This is used by the \c ir_swizzle constructors.
1800 void init_mask(const unsigned *components
, unsigned count
);
1804 class ir_dereference
: public ir_rvalue
{
1806 virtual ir_dereference
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
1808 virtual ir_dereference
*as_dereference()
1813 bool is_lvalue() const;
1816 * Get the variable that is ultimately referenced by an r-value
1818 virtual ir_variable
*variable_referenced() const = 0;
1821 * Get the constant that is ultimately referenced by an r-value,
1822 * in a constant expression evaluation context.
1824 * The offset is used when the reference is to a specific column of
1827 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const = 0;
1831 class ir_dereference_variable
: public ir_dereference
{
1833 ir_dereference_variable(ir_variable
*var
);
1835 virtual ir_dereference_variable
*clone(void *mem_ctx
,
1836 struct hash_table
*) const;
1838 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1840 virtual ir_dereference_variable
*as_dereference_variable()
1846 * Get the variable that is ultimately referenced by an r-value
1848 virtual ir_variable
*variable_referenced() const
1854 * Get the constant that is ultimately referenced by an r-value,
1855 * in a constant expression evaluation context.
1857 * The offset is used when the reference is to a specific column of
1860 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const;
1862 virtual ir_variable
*whole_variable_referenced()
1864 /* ir_dereference_variable objects always dereference the entire
1865 * variable. However, if this dereference is dereferenced by anything
1866 * else, the complete deferefernce chain is not a whole-variable
1867 * dereference. This method should only be called on the top most
1868 * ir_rvalue in a dereference chain.
1873 virtual void accept(ir_visitor
*v
)
1878 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1881 * Object being dereferenced.
1887 class ir_dereference_array
: public ir_dereference
{
1889 ir_dereference_array(ir_rvalue
*value
, ir_rvalue
*array_index
);
1891 ir_dereference_array(ir_variable
*var
, ir_rvalue
*array_index
);
1893 virtual ir_dereference_array
*clone(void *mem_ctx
,
1894 struct hash_table
*) const;
1896 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1898 virtual ir_dereference_array
*as_dereference_array()
1904 * Get the variable that is ultimately referenced by an r-value
1906 virtual ir_variable
*variable_referenced() const
1908 return this->array
->variable_referenced();
1912 * Get the constant that is ultimately referenced by an r-value,
1913 * in a constant expression evaluation context.
1915 * The offset is used when the reference is to a specific column of
1918 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const;
1920 virtual void accept(ir_visitor
*v
)
1925 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1928 ir_rvalue
*array_index
;
1931 void set_array(ir_rvalue
*value
);
1935 class ir_dereference_record
: public ir_dereference
{
1937 ir_dereference_record(ir_rvalue
*value
, const char *field
);
1939 ir_dereference_record(ir_variable
*var
, const char *field
);
1941 virtual ir_dereference_record
*clone(void *mem_ctx
,
1942 struct hash_table
*) const;
1944 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1946 virtual ir_dereference_record
*as_dereference_record()
1952 * Get the variable that is ultimately referenced by an r-value
1954 virtual ir_variable
*variable_referenced() const
1956 return this->record
->variable_referenced();
1960 * Get the constant that is ultimately referenced by an r-value,
1961 * in a constant expression evaluation context.
1963 * The offset is used when the reference is to a specific column of
1966 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const;
1968 virtual void accept(ir_visitor
*v
)
1973 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1981 * Data stored in an ir_constant
1983 union ir_constant_data
{
1991 class ir_constant
: public ir_rvalue
{
1993 ir_constant(const struct glsl_type
*type
, const ir_constant_data
*data
);
1994 ir_constant(bool b
, unsigned vector_elements
=1);
1995 ir_constant(unsigned int u
, unsigned vector_elements
=1);
1996 ir_constant(int i
, unsigned vector_elements
=1);
1997 ir_constant(float f
, unsigned vector_elements
=1);
2000 * Construct an ir_constant from a list of ir_constant values
2002 ir_constant(const struct glsl_type
*type
, exec_list
*values
);
2005 * Construct an ir_constant from a scalar component of another ir_constant
2007 * The new \c ir_constant inherits the type of the component from the
2011 * In the case of a matrix constant, the new constant is a scalar, \b not
2014 ir_constant(const ir_constant
*c
, unsigned i
);
2017 * Return a new ir_constant of the specified type containing all zeros.
2019 static ir_constant
*zero(void *mem_ctx
, const glsl_type
*type
);
2021 virtual ir_constant
*clone(void *mem_ctx
, struct hash_table
*) const;
2023 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
2025 virtual ir_constant
*as_constant()
2030 virtual void accept(ir_visitor
*v
)
2035 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2038 * Get a particular component of a constant as a specific type
2040 * This is useful, for example, to get a value from an integer constant
2041 * as a float or bool. This appears frequently when constructors are
2042 * called with all constant parameters.
2045 bool get_bool_component(unsigned i
) const;
2046 float get_float_component(unsigned i
) const;
2047 int get_int_component(unsigned i
) const;
2048 unsigned get_uint_component(unsigned i
) const;
2051 ir_constant
*get_array_element(unsigned i
) const;
2053 ir_constant
*get_record_field(const char *name
);
2056 * Copy the values on another constant at a given offset.
2058 * The offset is ignored for array or struct copies, it's only for
2059 * scalars or vectors into vectors or matrices.
2061 * With identical types on both sides and zero offset it's clone()
2062 * without creating a new object.
2065 void copy_offset(ir_constant
*src
, int offset
);
2068 * Copy the values on another constant at a given offset and
2069 * following an assign-like mask.
2071 * The mask is ignored for scalars.
2073 * Note that this function only handles what assign can handle,
2074 * i.e. at most a vector as source and a column of a matrix as
2078 void copy_masked_offset(ir_constant
*src
, int offset
, unsigned int mask
);
2081 * Determine whether a constant has the same value as another constant
2083 * \sa ir_constant::is_zero, ir_constant::is_one,
2084 * ir_constant::is_negative_one, ir_constant::is_basis
2086 bool has_value(const ir_constant
*) const;
2088 virtual bool is_zero() const;
2089 virtual bool is_one() const;
2090 virtual bool is_negative_one() const;
2091 virtual bool is_basis() const;
2094 * Value of the constant.
2096 * The field used to back the values supplied by the constant is determined
2097 * by the type associated with the \c ir_instruction. Constants may be
2098 * scalars, vectors, or matrices.
2100 union ir_constant_data value
;
2102 /* Array elements */
2103 ir_constant
**array_elements
;
2105 /* Structure fields */
2106 exec_list components
;
2110 * Parameterless constructor only used by the clone method
2118 * IR instruction to emit a vertex in a geometry shader.
2120 class ir_emit_vertex
: public ir_instruction
{
2124 ir_type
= ir_type_emit_vertex
;
2127 virtual void accept(ir_visitor
*v
)
2132 virtual ir_emit_vertex
*clone(void *mem_ctx
, struct hash_table
*) const
2134 return new(mem_ctx
) ir_emit_vertex();
2137 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2141 * IR instruction to complete the current primitive and start a new one in a
2144 class ir_end_primitive
: public ir_instruction
{
2148 ir_type
= ir_type_end_primitive
;
2151 virtual void accept(ir_visitor
*v
)
2156 virtual ir_end_primitive
*clone(void *mem_ctx
, struct hash_table
*) const
2158 return new(mem_ctx
) ir_end_primitive();
2161 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2165 * Apply a visitor to each IR node in a list
2168 visit_exec_list(exec_list
*list
, ir_visitor
*visitor
);
2171 * Validate invariants on each IR node in a list
2173 void validate_ir_tree(exec_list
*instructions
);
2175 struct _mesa_glsl_parse_state
;
2176 struct gl_shader_program
;
2179 * Detect whether an unlinked shader contains static recursion
2181 * If the list of instructions is determined to contain static recursion,
2182 * \c _mesa_glsl_error will be called to emit error messages for each function
2183 * that is in the recursion cycle.
2186 detect_recursion_unlinked(struct _mesa_glsl_parse_state
*state
,
2187 exec_list
*instructions
);
2190 * Detect whether a linked shader contains static recursion
2192 * If the list of instructions is determined to contain static recursion,
2193 * \c link_error_printf will be called to emit error messages for each function
2194 * that is in the recursion cycle. In addition,
2195 * \c gl_shader_program::LinkStatus will be set to false.
2198 detect_recursion_linked(struct gl_shader_program
*prog
,
2199 exec_list
*instructions
);
2202 * Make a clone of each IR instruction in a list
2204 * \param in List of IR instructions that are to be cloned
2205 * \param out List to hold the cloned instructions
2208 clone_ir_list(void *mem_ctx
, exec_list
*out
, const exec_list
*in
);
2211 _mesa_glsl_initialize_variables(exec_list
*instructions
,
2212 struct _mesa_glsl_parse_state
*state
);
2215 _mesa_glsl_initialize_functions(_mesa_glsl_parse_state
*state
);
2218 _mesa_glsl_initialize_builtin_functions();
2220 extern ir_function_signature
*
2221 _mesa_glsl_find_builtin_function(_mesa_glsl_parse_state
*state
,
2222 const char *name
, exec_list
*actual_parameters
);
2225 _mesa_glsl_release_functions(void);
2228 _mesa_glsl_release_builtin_functions(void);
2231 reparent_ir(exec_list
*list
, void *mem_ctx
);
2233 struct glsl_symbol_table
;
2236 import_prototypes(const exec_list
*source
, exec_list
*dest
,
2237 struct glsl_symbol_table
*symbols
, void *mem_ctx
);
2240 ir_has_call(ir_instruction
*ir
);
2243 do_set_program_inouts(exec_list
*instructions
, struct gl_program
*prog
,
2244 GLenum shader_type
);
2247 prototype_string(const glsl_type
*return_type
, const char *name
,
2248 exec_list
*parameters
);
2251 #endif /* __cplusplus */
2253 extern void _mesa_print_ir(struct exec_list
*instructions
,
2254 struct _mesa_glsl_parse_state
*state
);
2261 vertices_per_prim(GLenum prim
);