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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 */
91 * Base class of all IR instructions
93 class ir_instruction
: public exec_node
{
95 enum ir_node_type ir_type
;
98 * GCC 4.7+ and clang warn when deleting an ir_instruction unless
99 * there's a virtual destructor present. Because we almost
100 * universally use ralloc for our memory management of
101 * ir_instructions, the destructor doesn't need to do any work.
103 virtual ~ir_instruction()
107 /** ir_print_visitor helper for debugging. */
108 void print(void) const;
110 virtual void accept(ir_visitor
*) = 0;
111 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*) = 0;
112 virtual ir_instruction
*clone(void *mem_ctx
,
113 struct hash_table
*ht
) const = 0;
116 * \name IR instruction downcast functions
118 * These functions either cast the object to a derived class or return
119 * \c NULL if the object's type does not match the specified derived class.
120 * Additional downcast functions will be added as needed.
123 virtual class ir_variable
* as_variable() { return NULL
; }
124 virtual class ir_function
* as_function() { return NULL
; }
125 virtual class ir_dereference
* as_dereference() { return NULL
; }
126 virtual class ir_dereference_array
* as_dereference_array() { return NULL
; }
127 virtual class ir_dereference_variable
*as_dereference_variable() { return NULL
; }
128 virtual class ir_dereference_record
*as_dereference_record() { return NULL
; }
129 virtual class ir_expression
* as_expression() { return NULL
; }
130 virtual class ir_rvalue
* as_rvalue() { return NULL
; }
131 virtual class ir_loop
* as_loop() { return NULL
; }
132 virtual class ir_assignment
* as_assignment() { return NULL
; }
133 virtual class ir_call
* as_call() { return NULL
; }
134 virtual class ir_return
* as_return() { return NULL
; }
135 virtual class ir_if
* as_if() { return NULL
; }
136 virtual class ir_swizzle
* as_swizzle() { return NULL
; }
137 virtual class ir_texture
* as_texture() { return NULL
; }
138 virtual class ir_constant
* as_constant() { return NULL
; }
139 virtual class ir_discard
* as_discard() { return NULL
; }
140 virtual class ir_jump
* as_jump() { return NULL
; }
144 * IR equality method: Return true if the referenced instruction would
145 * return the same value as this one.
147 * This intended to be used for CSE and algebraic optimizations, on rvalues
148 * in particular. No support for other instruction types (assignments,
149 * jumps, calls, etc.) is planned.
151 virtual bool equals(ir_instruction
*ir
);
156 ir_type
= ir_type_unset
;
162 * The base class for all "values"/expression trees.
164 class ir_rvalue
: public ir_instruction
{
166 const struct glsl_type
*type
;
168 virtual ir_rvalue
*clone(void *mem_ctx
, struct hash_table
*) const;
170 virtual void accept(ir_visitor
*v
)
175 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
177 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
179 virtual ir_rvalue
* as_rvalue()
184 ir_rvalue
*as_rvalue_to_saturate();
186 virtual bool is_lvalue() const
192 * Get the variable that is ultimately referenced by an r-value
194 virtual ir_variable
*variable_referenced() const
201 * If an r-value is a reference to a whole variable, get that variable
204 * Pointer to a variable that is completely dereferenced by the r-value. If
205 * the r-value is not a dereference or the dereference does not access the
206 * entire variable (i.e., it's just one array element, struct field), \c NULL
209 virtual ir_variable
*whole_variable_referenced()
215 * Determine if an r-value has the value zero
217 * The base implementation of this function always returns \c false. The
218 * \c ir_constant class over-rides this function to return \c true \b only
219 * for vector and scalar types that have all elements set to the value
220 * zero (or \c false for booleans).
222 * \sa ir_constant::has_value, ir_rvalue::is_one, ir_rvalue::is_negative_one,
223 * ir_constant::is_basis
225 virtual bool is_zero() const;
228 * Determine if an r-value has the value one
230 * The base implementation of this function always returns \c false. The
231 * \c ir_constant class over-rides this function to return \c true \b only
232 * for vector and scalar types that have all elements set to the value
233 * one (or \c true for booleans).
235 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_negative_one,
236 * ir_constant::is_basis
238 virtual bool is_one() const;
241 * Determine if an r-value has the value negative one
243 * The base implementation of this function always returns \c false. The
244 * \c ir_constant class over-rides this function to return \c true \b only
245 * for vector and scalar types that have all elements set to the value
246 * negative one. For boolean types, the result is always \c false.
248 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one
249 * ir_constant::is_basis
251 virtual bool is_negative_one() const;
254 * Determine if an r-value is a basis vector
256 * The base implementation of this function always returns \c false. The
257 * \c ir_constant class over-rides this function to return \c true \b only
258 * for vector and scalar types that have one element set to the value one,
259 * and the other elements set to the value zero. For boolean types, the
260 * result is always \c false.
262 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one,
263 * is_constant::is_negative_one
265 virtual bool is_basis() const;
269 * Return a generic value of error_type.
271 * Allocation will be performed with 'mem_ctx' as ralloc owner.
273 static ir_rvalue
*error_value(void *mem_ctx
);
281 * Variable storage classes
283 enum ir_variable_mode
{
284 ir_var_auto
= 0, /**< Function local variables and globals. */
285 ir_var_uniform
, /**< Variable declared as a uniform. */
290 ir_var_function_inout
,
291 ir_var_const_in
, /**< "in" param that must be a constant expression */
292 ir_var_system_value
, /**< Ex: front-face, instance-id, etc. */
293 ir_var_temporary
, /**< Temporary variable generated during compilation. */
294 ir_var_mode_count
/**< Number of variable modes */
298 * Enum keeping track of how a variable was declared. For error checking of
299 * the gl_PerVertex redeclaration rules.
301 enum ir_var_declaration_type
{
303 * Normal declaration (for most variables, this means an explicit
304 * declaration. Exception: temporaries are always implicitly declared, but
305 * they still use ir_var_declared_normally).
307 * Note: an ir_variable that represents a named interface block uses
308 * ir_var_declared_normally.
310 ir_var_declared_normally
= 0,
313 * Variable was explicitly declared (or re-declared) in an unnamed
316 ir_var_declared_in_block
,
319 * Variable is an implicitly declared built-in that has not been explicitly
320 * re-declared by the shader.
322 ir_var_declared_implicitly
,
326 * \brief Layout qualifiers for gl_FragDepth.
328 * The AMD/ARB_conservative_depth extensions allow gl_FragDepth to be redeclared
329 * with a layout qualifier.
331 enum ir_depth_layout
{
332 ir_depth_layout_none
, /**< No depth layout is specified. */
334 ir_depth_layout_greater
,
335 ir_depth_layout_less
,
336 ir_depth_layout_unchanged
340 * \brief Convert depth layout qualifier to string.
343 depth_layout_string(ir_depth_layout layout
);
346 * Description of built-in state associated with a uniform
348 * \sa ir_variable::state_slots
350 struct ir_state_slot
{
357 * Get the string value for an interpolation qualifier
359 * \return The string that would be used in a shader to specify \c
360 * mode will be returned.
362 * This function is used to generate error messages of the form "shader
363 * uses %s interpolation qualifier", so in the case where there is no
364 * interpolation qualifier, it returns "no".
366 * This function should only be used on a shader input or output variable.
368 const char *interpolation_string(unsigned interpolation
);
371 class ir_variable
: public ir_instruction
{
373 ir_variable(const struct glsl_type
*, const char *, ir_variable_mode
);
375 virtual ir_variable
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
377 virtual ir_variable
*as_variable()
382 virtual void accept(ir_visitor
*v
)
387 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
391 * Determine how this variable should be interpolated based on its
392 * interpolation qualifier (if present), whether it is gl_Color or
393 * gl_SecondaryColor, and whether flatshading is enabled in the current GL
396 * The return value will always be either INTERP_QUALIFIER_SMOOTH,
397 * INTERP_QUALIFIER_NOPERSPECTIVE, or INTERP_QUALIFIER_FLAT.
399 glsl_interp_qualifier
determine_interpolation_mode(bool flat_shade
);
402 * Determine whether or not a variable is part of a uniform block.
404 inline bool is_in_uniform_block() const
406 return this->mode
== ir_var_uniform
&& this->interface_type
!= NULL
;
410 * Determine whether or not a variable is the declaration of an interface
413 * For the first declaration below, there will be an \c ir_variable named
414 * "instance" whose type and whose instance_type will be the same
415 * \cglsl_type. For the second declaration, there will be an \c ir_variable
416 * named "f" whose type is float and whose instance_type is B2.
418 * "instance" is an interface instance variable, but "f" is not.
428 inline bool is_interface_instance() const
430 const glsl_type
*const t
= this->type
;
432 return (t
== this->interface_type
)
433 || (t
->is_array() && t
->fields
.array
== this->interface_type
);
437 * Set this->interface_type on a newly created variable.
439 void init_interface_type(const struct glsl_type
*type
)
441 assert(this->interface_type
== NULL
);
442 this->interface_type
= type
;
443 if (this->is_interface_instance()) {
444 this->max_ifc_array_access
=
445 rzalloc_array(this, unsigned, type
->length
);
450 * Change this->interface_type on a variable that previously had a
451 * different, but compatible, interface_type. This is used during linking
452 * to set the size of arrays in interface blocks.
454 void change_interface_type(const struct glsl_type
*type
)
456 if (this->max_ifc_array_access
!= NULL
) {
457 /* max_ifc_array_access has already been allocated, so make sure the
458 * new interface has the same number of fields as the old one.
460 assert(this->interface_type
->length
== type
->length
);
462 this->interface_type
= type
;
466 * Change this->interface_type on a variable that previously had a
467 * different, and incompatible, interface_type. This is used during
468 * compilation to handle redeclaration of the built-in gl_PerVertex
471 void reinit_interface_type(const struct glsl_type
*type
)
473 if (this->max_ifc_array_access
!= NULL
) {
475 /* Redeclaring gl_PerVertex is only allowed if none of the built-ins
476 * it defines have been accessed yet; so it's safe to throw away the
477 * old max_ifc_array_access pointer, since all of its values are
480 for (unsigned i
= 0; i
< this->interface_type
->length
; i
++)
481 assert(this->max_ifc_array_access
[i
] == 0);
483 ralloc_free(this->max_ifc_array_access
);
484 this->max_ifc_array_access
= NULL
;
486 this->interface_type
= NULL
;
487 init_interface_type(type
);
490 const glsl_type
*get_interface_type() const
492 return this->interface_type
;
496 * Declared type of the variable
498 const struct glsl_type
*type
;
501 * Declared name of the variable
506 * Highest element accessed with a constant expression array index
508 * Not used for non-array variables.
510 unsigned max_array_access
;
513 * For variables which satisfy the is_interface_instance() predicate, this
514 * points to an array of integers such that if the ith member of the
515 * interface block is an array, max_ifc_array_access[i] is the maximum
516 * array element of that member that has been accessed. If the ith member
517 * of the interface block is not an array, max_ifc_array_access[i] is
520 * For variables whose type is not an interface block, this pointer is
523 unsigned *max_ifc_array_access
;
525 struct ir_variable_data
{
528 * Is the variable read-only?
530 * This is set for variables declared as \c const, shader inputs,
533 unsigned read_only
:1;
536 unsigned invariant
:1;
541 * Has this variable been used for reading or writing?
543 * Several GLSL semantic checks require knowledge of whether or not a
544 * variable has been used. For example, it is an error to redeclare a
545 * variable as invariant after it has been used.
547 * This is only maintained in the ast_to_hir.cpp path, not in
548 * Mesa's fixed function or ARB program paths.
553 * Has this variable been statically assigned?
555 * This answers whether the variable was assigned in any path of
556 * the shader during ast_to_hir. This doesn't answer whether it is
557 * still written after dead code removal, nor is it maintained in
558 * non-ast_to_hir.cpp (GLSL parsing) paths.
563 * Enum indicating how the variable was declared. See
564 * ir_var_declaration_type.
566 * This is used to detect certain kinds of illegal variable redeclarations.
568 unsigned how_declared
:2;
571 * Storage class of the variable.
573 * \sa ir_variable_mode
578 * Interpolation mode for shader inputs / outputs
580 * \sa ir_variable_interpolation
582 unsigned interpolation
:2;
585 * \name ARB_fragment_coord_conventions
588 unsigned origin_upper_left
:1;
589 unsigned pixel_center_integer
:1;
593 * Was the location explicitly set in the shader?
595 * If the location is explicitly set in the shader, it \b cannot be changed
596 * by the linker or by the API (e.g., calls to \c glBindAttribLocation have
599 unsigned explicit_location
:1;
600 unsigned explicit_index
:1;
603 * Was an initial binding explicitly set in the shader?
605 * If so, constant_value contains an integer ir_constant representing the
606 * initial binding point.
608 unsigned explicit_binding
:1;
611 * Does this variable have an initializer?
613 * This is used by the linker to cross-validiate initializers of global
616 unsigned has_initializer
:1;
619 * Is this variable a generic output or input that has not yet been matched
620 * up to a variable in another stage of the pipeline?
622 * This is used by the linker as scratch storage while assigning locations
623 * to generic inputs and outputs.
625 unsigned is_unmatched_generic_inout
:1;
628 * If non-zero, then this variable may be packed along with other variables
629 * into a single varying slot, so this offset should be applied when
630 * accessing components. For example, an offset of 1 means that the x
631 * component of this variable is actually stored in component y of the
632 * location specified by \c location.
634 unsigned location_frac
:2;
637 * Non-zero if this variable was created by lowering a named interface
638 * block which was not an array.
640 * Note that this variable and \c from_named_ifc_block_array will never
643 unsigned from_named_ifc_block_nonarray
:1;
646 * Non-zero if this variable was created by lowering a named interface
647 * block which was an array.
649 * Note that this variable and \c from_named_ifc_block_nonarray will never
652 unsigned from_named_ifc_block_array
:1;
655 * \brief Layout qualifier for gl_FragDepth.
657 * This is not equal to \c ir_depth_layout_none if and only if this
658 * variable is \c gl_FragDepth and a layout qualifier is specified.
660 ir_depth_layout depth_layout
;
663 * Storage location of the base of this variable
665 * The precise meaning of this field depends on the nature of the variable.
667 * - Vertex shader input: one of the values from \c gl_vert_attrib.
668 * - Vertex shader output: one of the values from \c gl_varying_slot.
669 * - Geometry shader input: one of the values from \c gl_varying_slot.
670 * - Geometry shader output: one of the values from \c gl_varying_slot.
671 * - Fragment shader input: one of the values from \c gl_varying_slot.
672 * - Fragment shader output: one of the values from \c gl_frag_result.
673 * - Uniforms: Per-stage uniform slot number for default uniform block.
674 * - Uniforms: Index within the uniform block definition for UBO members.
675 * - Other: This field is not currently used.
677 * If the variable is a uniform, shader input, or shader output, and the
678 * slot has not been assigned, the value will be -1.
683 * output index for dual source blending.
688 * Initial binding point for a sampler or UBO.
690 * For array types, this represents the binding point for the first element.
695 * Location an atomic counter is stored at.
698 unsigned buffer_index
;
703 * Built-in state that backs this uniform
705 * Once set at variable creation, \c state_slots must remain invariant.
706 * This is because, ideally, this array would be shared by all clones of
707 * this variable in the IR tree. In other words, we'd really like for it
708 * to be a fly-weight.
710 * If the variable is not a uniform, \c num_state_slots will be zero and
711 * \c state_slots will be \c NULL.
714 unsigned num_state_slots
; /**< Number of state slots used */
715 ir_state_slot
*state_slots
; /**< State descriptors. */
719 * Emit a warning if this variable is accessed.
721 const char *warn_extension
;
724 * Value assigned in the initializer of a variable declared "const"
726 ir_constant
*constant_value
;
729 * Constant expression assigned in the initializer of the variable
732 * This field and \c ::constant_value are distinct. Even if the two fields
733 * refer to constants with the same value, they must point to separate
736 ir_constant
*constant_initializer
;
740 * For variables that are in an interface block or are an instance of an
741 * interface block, this is the \c GLSL_TYPE_INTERFACE type for that block.
743 * \sa ir_variable::location
745 const glsl_type
*interface_type
;
749 * A function that returns whether a built-in function is available in the
750 * current shading language (based on version, ES or desktop, and extensions).
752 typedef bool (*builtin_available_predicate
)(const _mesa_glsl_parse_state
*);
756 * The representation of a function instance; may be the full definition or
757 * simply a prototype.
759 class ir_function_signature
: public ir_instruction
{
760 /* An ir_function_signature will be part of the list of signatures in
764 ir_function_signature(const glsl_type
*return_type
,
765 builtin_available_predicate builtin_avail
= NULL
);
767 virtual ir_function_signature
*clone(void *mem_ctx
,
768 struct hash_table
*ht
) const;
769 ir_function_signature
*clone_prototype(void *mem_ctx
,
770 struct hash_table
*ht
) const;
772 virtual void accept(ir_visitor
*v
)
777 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
780 * Attempt to evaluate this function as a constant expression,
781 * given a list of the actual parameters and the variable context.
782 * Returns NULL for non-built-ins.
784 ir_constant
*constant_expression_value(exec_list
*actual_parameters
, struct hash_table
*variable_context
);
787 * Get the name of the function for which this is a signature
789 const char *function_name() const;
792 * Get a handle to the function for which this is a signature
794 * There is no setter function, this function returns a \c const pointer,
795 * and \c ir_function_signature::_function is private for a reason. The
796 * only way to make a connection between a function and function signature
797 * is via \c ir_function::add_signature. This helps ensure that certain
798 * invariants (i.e., a function signature is in the list of signatures for
799 * its \c _function) are met.
801 * \sa ir_function::add_signature
803 inline const class ir_function
*function() const
805 return this->_function
;
809 * Check whether the qualifiers match between this signature's parameters
810 * and the supplied parameter list. If not, returns the name of the first
811 * parameter with mismatched qualifiers (for use in error messages).
813 const char *qualifiers_match(exec_list
*params
);
816 * Replace the current parameter list with the given one. This is useful
817 * if the current information came from a prototype, and either has invalid
818 * or missing parameter names.
820 void replace_parameters(exec_list
*new_params
);
823 * Function return type.
825 * \note This discards the optional precision qualifier.
827 const struct glsl_type
*return_type
;
830 * List of ir_variable of function parameters.
832 * This represents the storage. The paramaters passed in a particular
833 * call will be in ir_call::actual_paramaters.
835 struct exec_list parameters
;
837 /** Whether or not this function has a body (which may be empty). */
838 unsigned is_defined
:1;
840 /** Whether or not this function signature is a built-in. */
841 bool is_builtin() const;
844 * Whether or not this function is an intrinsic to be implemented
849 /** Whether or not a built-in is available for this shader. */
850 bool is_builtin_available(const _mesa_glsl_parse_state
*state
) const;
852 /** Body of instructions in the function. */
853 struct exec_list body
;
857 * A function pointer to a predicate that answers whether a built-in
858 * function is available in the current shader. NULL if not a built-in.
860 builtin_available_predicate builtin_avail
;
862 /** Function of which this signature is one overload. */
863 class ir_function
*_function
;
865 /** Function signature of which this one is a prototype clone */
866 const ir_function_signature
*origin
;
868 friend class ir_function
;
871 * Helper function to run a list of instructions for constant
872 * expression evaluation.
874 * The hash table represents the values of the visible variables.
875 * There are no scoping issues because the table is indexed on
876 * ir_variable pointers, not variable names.
878 * Returns false if the expression is not constant, true otherwise,
879 * and the value in *result if result is non-NULL.
881 bool constant_expression_evaluate_expression_list(const struct exec_list
&body
,
882 struct hash_table
*variable_context
,
883 ir_constant
**result
);
888 * Header for tracking multiple overloaded functions with the same name.
889 * Contains a list of ir_function_signatures representing each of the
892 class ir_function
: public ir_instruction
{
894 ir_function(const char *name
);
896 virtual ir_function
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
898 virtual ir_function
*as_function()
903 virtual void accept(ir_visitor
*v
)
908 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
910 void add_signature(ir_function_signature
*sig
)
912 sig
->_function
= this;
913 this->signatures
.push_tail(sig
);
917 * Get an iterator for the set of function signatures
919 exec_list_iterator
iterator()
921 return signatures
.iterator();
925 * Find a signature that matches a set of actual parameters, taking implicit
926 * conversions into account. Also flags whether the match was exact.
928 ir_function_signature
*matching_signature(_mesa_glsl_parse_state
*state
,
929 const exec_list
*actual_param
,
930 bool *match_is_exact
);
933 * Find a signature that matches a set of actual parameters, taking implicit
934 * conversions into account.
936 ir_function_signature
*matching_signature(_mesa_glsl_parse_state
*state
,
937 const exec_list
*actual_param
);
940 * Find a signature that exactly matches a set of actual parameters without
941 * any implicit type conversions.
943 ir_function_signature
*exact_matching_signature(_mesa_glsl_parse_state
*state
,
944 const exec_list
*actual_ps
);
947 * Name of the function.
951 /** Whether or not this function has a signature that isn't a built-in. */
952 bool has_user_signature();
955 * List of ir_function_signature for each overloaded function with this name.
957 struct exec_list signatures
;
960 inline const char *ir_function_signature::function_name() const
962 return this->_function
->name
;
968 * IR instruction representing high-level if-statements
970 class ir_if
: public ir_instruction
{
972 ir_if(ir_rvalue
*condition
)
973 : condition(condition
)
975 ir_type
= ir_type_if
;
978 virtual ir_if
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
980 virtual ir_if
*as_if()
985 virtual void accept(ir_visitor
*v
)
990 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
992 ir_rvalue
*condition
;
993 /** List of ir_instruction for the body of the then branch */
994 exec_list then_instructions
;
995 /** List of ir_instruction for the body of the else branch */
996 exec_list else_instructions
;
1001 * IR instruction representing a high-level loop structure.
1003 class ir_loop
: public ir_instruction
{
1007 virtual ir_loop
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1009 virtual void accept(ir_visitor
*v
)
1014 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1016 virtual ir_loop
*as_loop()
1022 * Get an iterator for the instructions of the loop body
1024 exec_list_iterator
iterator()
1026 return body_instructions
.iterator();
1029 /** List of ir_instruction that make up the body of the loop. */
1030 exec_list body_instructions
;
1034 class ir_assignment
: public ir_instruction
{
1036 ir_assignment(ir_rvalue
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
= NULL
);
1039 * Construct an assignment with an explicit write mask
1042 * Since a write mask is supplied, the LHS must already be a bare
1043 * \c ir_dereference. The cannot be any swizzles in the LHS.
1045 ir_assignment(ir_dereference
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
,
1046 unsigned write_mask
);
1048 virtual ir_assignment
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1050 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1052 virtual void accept(ir_visitor
*v
)
1057 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1059 virtual ir_assignment
* as_assignment()
1065 * Get a whole variable written by an assignment
1067 * If the LHS of the assignment writes a whole variable, the variable is
1068 * returned. Otherwise \c NULL is returned. Examples of whole-variable
1071 * - Assigning to a scalar
1072 * - Assigning to all components of a vector
1073 * - Whole array (or matrix) assignment
1074 * - Whole structure assignment
1076 ir_variable
*whole_variable_written();
1079 * Set the LHS of an assignment
1081 void set_lhs(ir_rvalue
*lhs
);
1084 * Left-hand side of the assignment.
1086 * This should be treated as read only. If you need to set the LHS of an
1087 * assignment, use \c ir_assignment::set_lhs.
1089 ir_dereference
*lhs
;
1092 * Value being assigned
1097 * Optional condition for the assignment.
1099 ir_rvalue
*condition
;
1103 * Component mask written
1105 * For non-vector types in the LHS, this field will be zero. For vector
1106 * types, a bit will be set for each component that is written. Note that
1107 * for \c vec2 and \c vec3 types only the lower bits will ever be set.
1109 * A partially-set write mask means that each enabled channel gets
1110 * the value from a consecutive channel of the rhs. For example,
1111 * to write just .xyw of gl_FrontColor with color:
1113 * (assign (constant bool (1)) (xyw)
1114 * (var_ref gl_FragColor)
1115 * (swiz xyw (var_ref color)))
1117 unsigned write_mask
:4;
1120 /* Update ir_expression::get_num_operands() and operator_strs when
1121 * updating this list.
1123 enum ir_expression_operation
{
1132 ir_unop_exp
, /**< Log base e on gentype */
1133 ir_unop_log
, /**< Natural log on gentype */
1136 ir_unop_f2i
, /**< Float-to-integer conversion. */
1137 ir_unop_f2u
, /**< Float-to-unsigned conversion. */
1138 ir_unop_i2f
, /**< Integer-to-float conversion. */
1139 ir_unop_f2b
, /**< Float-to-boolean conversion */
1140 ir_unop_b2f
, /**< Boolean-to-float conversion */
1141 ir_unop_i2b
, /**< int-to-boolean conversion */
1142 ir_unop_b2i
, /**< Boolean-to-int conversion */
1143 ir_unop_u2f
, /**< Unsigned-to-float conversion. */
1144 ir_unop_i2u
, /**< Integer-to-unsigned conversion. */
1145 ir_unop_u2i
, /**< Unsigned-to-integer conversion. */
1146 ir_unop_bitcast_i2f
, /**< Bit-identical int-to-float "conversion" */
1147 ir_unop_bitcast_f2i
, /**< Bit-identical float-to-int "conversion" */
1148 ir_unop_bitcast_u2f
, /**< Bit-identical uint-to-float "conversion" */
1149 ir_unop_bitcast_f2u
, /**< Bit-identical float-to-uint "conversion" */
1153 * \name Unary floating-point rounding operations.
1164 * \name Trigonometric operations.
1169 ir_unop_sin_reduced
, /**< Reduced range sin. [-pi, pi] */
1170 ir_unop_cos_reduced
, /**< Reduced range cos. [-pi, pi] */
1174 * \name Partial derivatives.
1182 * \name Floating point pack and unpack operations.
1185 ir_unop_pack_snorm_2x16
,
1186 ir_unop_pack_snorm_4x8
,
1187 ir_unop_pack_unorm_2x16
,
1188 ir_unop_pack_unorm_4x8
,
1189 ir_unop_pack_half_2x16
,
1190 ir_unop_unpack_snorm_2x16
,
1191 ir_unop_unpack_snorm_4x8
,
1192 ir_unop_unpack_unorm_2x16
,
1193 ir_unop_unpack_unorm_4x8
,
1194 ir_unop_unpack_half_2x16
,
1198 * \name Lowered floating point unpacking operations.
1200 * \see lower_packing_builtins_visitor::split_unpack_half_2x16
1203 ir_unop_unpack_half_2x16_split_x
,
1204 ir_unop_unpack_half_2x16_split_y
,
1208 * \name Bit operations, part of ARB_gpu_shader5.
1211 ir_unop_bitfield_reverse
,
1220 * A sentinel marking the last of the unary operations.
1222 ir_last_unop
= ir_unop_noise
,
1226 ir_binop_mul
, /**< Floating-point or low 32-bit integer multiply. */
1227 ir_binop_imul_high
, /**< Calculates the high 32-bits of a 64-bit multiply. */
1231 * Returns the carry resulting from the addition of the two arguments.
1238 * Returns the borrow resulting from the subtraction of the second argument
1239 * from the first argument.
1246 * Takes one of two combinations of arguments:
1249 * - mod(vecN, float)
1251 * Does not take integer types.
1256 * \name Binary comparison operators which return a boolean vector.
1257 * The type of both operands must be equal.
1267 * Returns single boolean for whether all components of operands[0]
1268 * equal the components of operands[1].
1272 * Returns single boolean for whether any component of operands[0]
1273 * is not equal to the corresponding component of operands[1].
1275 ir_binop_any_nequal
,
1279 * \name Bit-wise binary operations.
1300 * \name Lowered floating point packing operations.
1302 * \see lower_packing_builtins_visitor::split_pack_half_2x16
1305 ir_binop_pack_half_2x16_split
,
1309 * \name First half of a lowered bitfieldInsert() operation.
1311 * \see lower_instructions::bitfield_insert_to_bfm_bfi
1318 * Load a value the size of a given GLSL type from a uniform block.
1320 * operand0 is the ir_constant uniform block index in the linked shader.
1321 * operand1 is a byte offset within the uniform block.
1326 * \name Multiplies a number by two to a power, part of ARB_gpu_shader5.
1333 * Extract a scalar from a vector
1335 * operand0 is the vector
1336 * operand1 is the index of the field to read from operand0
1338 ir_binop_vector_extract
,
1341 * A sentinel marking the last of the binary operations.
1343 ir_last_binop
= ir_binop_vector_extract
,
1346 * \name Fused floating-point multiply-add, part of ARB_gpu_shader5.
1355 * \name Conditional Select
1357 * A vector conditional select instruction (like ?:, but operating per-
1358 * component on vectors).
1360 * \see lower_instructions_visitor::ldexp_to_arith
1367 * \name Second half of a lowered bitfieldInsert() operation.
1369 * \see lower_instructions::bitfield_insert_to_bfm_bfi
1375 ir_triop_bitfield_extract
,
1378 * Generate a value with one field of a vector changed
1380 * operand0 is the vector
1381 * operand1 is the value to write into the vector result
1382 * operand2 is the index in operand0 to be modified
1384 ir_triop_vector_insert
,
1387 * A sentinel marking the last of the ternary operations.
1389 ir_last_triop
= ir_triop_vector_insert
,
1391 ir_quadop_bitfield_insert
,
1396 * A sentinel marking the last of the ternary operations.
1398 ir_last_quadop
= ir_quadop_vector
,
1401 * A sentinel marking the last of all operations.
1403 ir_last_opcode
= ir_quadop_vector
1406 class ir_expression
: public ir_rvalue
{
1408 ir_expression(int op
, const struct glsl_type
*type
,
1409 ir_rvalue
*op0
, ir_rvalue
*op1
= NULL
,
1410 ir_rvalue
*op2
= NULL
, ir_rvalue
*op3
= NULL
);
1413 * Constructor for unary operation expressions
1415 ir_expression(int op
, ir_rvalue
*);
1418 * Constructor for binary operation expressions
1420 ir_expression(int op
, ir_rvalue
*op0
, ir_rvalue
*op1
);
1423 * Constructor for ternary operation expressions
1425 ir_expression(int op
, ir_rvalue
*op0
, ir_rvalue
*op1
, ir_rvalue
*op2
);
1427 virtual ir_expression
*as_expression()
1432 virtual bool equals(ir_instruction
*ir
);
1434 virtual ir_expression
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1437 * Attempt to constant-fold the expression
1439 * The "variable_context" hash table links ir_variable * to ir_constant *
1440 * that represent the variables' values. \c NULL represents an empty
1443 * If the expression cannot be constant folded, this method will return
1446 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1449 * Determine the number of operands used by an expression
1451 static unsigned int get_num_operands(ir_expression_operation
);
1454 * Determine the number of operands used by an expression
1456 unsigned int get_num_operands() const
1458 return (this->operation
== ir_quadop_vector
)
1459 ? this->type
->vector_elements
: get_num_operands(operation
);
1463 * Return a string representing this expression's operator.
1465 const char *operator_string();
1468 * Return a string representing this expression's operator.
1470 static const char *operator_string(ir_expression_operation
);
1474 * Do a reverse-lookup to translate the given string into an operator.
1476 static ir_expression_operation
get_operator(const char *);
1478 virtual void accept(ir_visitor
*v
)
1483 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1485 ir_expression_operation operation
;
1486 ir_rvalue
*operands
[4];
1491 * HIR instruction representing a high-level function call, containing a list
1492 * of parameters and returning a value in the supplied temporary.
1494 class ir_call
: public ir_instruction
{
1496 ir_call(ir_function_signature
*callee
,
1497 ir_dereference_variable
*return_deref
,
1498 exec_list
*actual_parameters
)
1499 : return_deref(return_deref
), callee(callee
)
1501 ir_type
= ir_type_call
;
1502 assert(callee
->return_type
!= NULL
);
1503 actual_parameters
->move_nodes_to(& this->actual_parameters
);
1504 this->use_builtin
= callee
->is_builtin();
1507 virtual ir_call
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1509 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1511 virtual ir_call
*as_call()
1516 virtual void accept(ir_visitor
*v
)
1521 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1524 * Get an iterator for the set of acutal parameters
1526 exec_list_iterator
iterator()
1528 return actual_parameters
.iterator();
1532 * Get the name of the function being called.
1534 const char *callee_name() const
1536 return callee
->function_name();
1540 * Generates an inline version of the function before @ir,
1541 * storing the return value in return_deref.
1543 void generate_inline(ir_instruction
*ir
);
1546 * Storage for the function's return value.
1547 * This must be NULL if the return type is void.
1549 ir_dereference_variable
*return_deref
;
1552 * The specific function signature being called.
1554 ir_function_signature
*callee
;
1556 /* List of ir_rvalue of paramaters passed in this call. */
1557 exec_list actual_parameters
;
1559 /** Should this call only bind to a built-in function? */
1565 * \name Jump-like IR instructions.
1567 * These include \c break, \c continue, \c return, and \c discard.
1570 class ir_jump
: public ir_instruction
{
1574 ir_type
= ir_type_unset
;
1578 virtual ir_jump
*as_jump()
1584 class ir_return
: public ir_jump
{
1589 this->ir_type
= ir_type_return
;
1592 ir_return(ir_rvalue
*value
)
1595 this->ir_type
= ir_type_return
;
1598 virtual ir_return
*clone(void *mem_ctx
, struct hash_table
*) const;
1600 virtual ir_return
*as_return()
1605 ir_rvalue
*get_value() const
1610 virtual void accept(ir_visitor
*v
)
1615 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1622 * Jump instructions used inside loops
1624 * These include \c break and \c continue. The \c break within a loop is
1625 * different from the \c break within a switch-statement.
1627 * \sa ir_switch_jump
1629 class ir_loop_jump
: public ir_jump
{
1636 ir_loop_jump(jump_mode mode
)
1638 this->ir_type
= ir_type_loop_jump
;
1642 virtual ir_loop_jump
*clone(void *mem_ctx
, struct hash_table
*) const;
1644 virtual void accept(ir_visitor
*v
)
1649 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1651 bool is_break() const
1653 return mode
== jump_break
;
1656 bool is_continue() const
1658 return mode
== jump_continue
;
1661 /** Mode selector for the jump instruction. */
1662 enum jump_mode mode
;
1666 * IR instruction representing discard statements.
1668 class ir_discard
: public ir_jump
{
1672 this->ir_type
= ir_type_discard
;
1673 this->condition
= NULL
;
1676 ir_discard(ir_rvalue
*cond
)
1678 this->ir_type
= ir_type_discard
;
1679 this->condition
= cond
;
1682 virtual ir_discard
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1684 virtual void accept(ir_visitor
*v
)
1689 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1691 virtual ir_discard
*as_discard()
1696 ir_rvalue
*condition
;
1702 * Texture sampling opcodes used in ir_texture
1704 enum ir_texture_opcode
{
1705 ir_tex
, /**< Regular texture look-up */
1706 ir_txb
, /**< Texture look-up with LOD bias */
1707 ir_txl
, /**< Texture look-up with explicit LOD */
1708 ir_txd
, /**< Texture look-up with partial derivatvies */
1709 ir_txf
, /**< Texel fetch with explicit LOD */
1710 ir_txf_ms
, /**< Multisample texture fetch */
1711 ir_txs
, /**< Texture size */
1712 ir_lod
, /**< Texture lod query */
1713 ir_tg4
, /**< Texture gather */
1714 ir_query_levels
/**< Texture levels query */
1719 * IR instruction to sample a texture
1721 * The specific form of the IR instruction depends on the \c mode value
1722 * selected from \c ir_texture_opcodes. In the printed IR, these will
1725 * Texel offset (0 or an expression)
1726 * | Projection divisor
1727 * | | Shadow comparitor
1730 * (tex <type> <sampler> <coordinate> 0 1 ( ))
1731 * (txb <type> <sampler> <coordinate> 0 1 ( ) <bias>)
1732 * (txl <type> <sampler> <coordinate> 0 1 ( ) <lod>)
1733 * (txd <type> <sampler> <coordinate> 0 1 ( ) (dPdx dPdy))
1734 * (txf <type> <sampler> <coordinate> 0 <lod>)
1736 * <type> <sampler> <coordinate> <sample_index>)
1737 * (txs <type> <sampler> <lod>)
1738 * (lod <type> <sampler> <coordinate>)
1739 * (tg4 <type> <sampler> <coordinate> <offset> <component>)
1740 * (query_levels <type> <sampler>)
1742 class ir_texture
: public ir_rvalue
{
1744 ir_texture(enum ir_texture_opcode op
)
1745 : op(op
), sampler(NULL
), coordinate(NULL
), projector(NULL
),
1746 shadow_comparitor(NULL
), offset(NULL
)
1748 this->ir_type
= ir_type_texture
;
1749 memset(&lod_info
, 0, sizeof(lod_info
));
1752 virtual ir_texture
*clone(void *mem_ctx
, struct hash_table
*) const;
1754 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1756 virtual void accept(ir_visitor
*v
)
1761 virtual ir_texture
*as_texture()
1766 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1768 virtual bool equals(ir_instruction
*ir
);
1771 * Return a string representing the ir_texture_opcode.
1773 const char *opcode_string();
1775 /** Set the sampler and type. */
1776 void set_sampler(ir_dereference
*sampler
, const glsl_type
*type
);
1779 * Do a reverse-lookup to translate a string into an ir_texture_opcode.
1781 static ir_texture_opcode
get_opcode(const char *);
1783 enum ir_texture_opcode op
;
1785 /** Sampler to use for the texture access. */
1786 ir_dereference
*sampler
;
1788 /** Texture coordinate to sample */
1789 ir_rvalue
*coordinate
;
1792 * Value used for projective divide.
1794 * If there is no projective divide (the common case), this will be
1795 * \c NULL. Optimization passes should check for this to point to a constant
1796 * of 1.0 and replace that with \c NULL.
1798 ir_rvalue
*projector
;
1801 * Coordinate used for comparison on shadow look-ups.
1803 * If there is no shadow comparison, this will be \c NULL. For the
1804 * \c ir_txf opcode, this *must* be \c NULL.
1806 ir_rvalue
*shadow_comparitor
;
1808 /** Texel offset. */
1812 ir_rvalue
*lod
; /**< Floating point LOD */
1813 ir_rvalue
*bias
; /**< Floating point LOD bias */
1814 ir_rvalue
*sample_index
; /**< MSAA sample index */
1815 ir_rvalue
*component
; /**< Gather component selector */
1817 ir_rvalue
*dPdx
; /**< Partial derivative of coordinate wrt X */
1818 ir_rvalue
*dPdy
; /**< Partial derivative of coordinate wrt Y */
1824 struct ir_swizzle_mask
{
1831 * Number of components in the swizzle.
1833 unsigned num_components
:3;
1836 * Does the swizzle contain duplicate components?
1838 * L-value swizzles cannot contain duplicate components.
1840 unsigned has_duplicates
:1;
1844 class ir_swizzle
: public ir_rvalue
{
1846 ir_swizzle(ir_rvalue
*, unsigned x
, unsigned y
, unsigned z
, unsigned w
,
1849 ir_swizzle(ir_rvalue
*val
, const unsigned *components
, unsigned count
);
1851 ir_swizzle(ir_rvalue
*val
, ir_swizzle_mask mask
);
1853 virtual ir_swizzle
*clone(void *mem_ctx
, struct hash_table
*) const;
1855 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1857 virtual ir_swizzle
*as_swizzle()
1863 * Construct an ir_swizzle from the textual representation. Can fail.
1865 static ir_swizzle
*create(ir_rvalue
*, const char *, unsigned vector_length
);
1867 virtual void accept(ir_visitor
*v
)
1872 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1874 virtual bool equals(ir_instruction
*ir
);
1876 bool is_lvalue() const
1878 return val
->is_lvalue() && !mask
.has_duplicates
;
1882 * Get the variable that is ultimately referenced by an r-value
1884 virtual ir_variable
*variable_referenced() const;
1887 ir_swizzle_mask mask
;
1891 * Initialize the mask component of a swizzle
1893 * This is used by the \c ir_swizzle constructors.
1895 void init_mask(const unsigned *components
, unsigned count
);
1899 class ir_dereference
: public ir_rvalue
{
1901 virtual ir_dereference
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
1903 virtual ir_dereference
*as_dereference()
1908 bool is_lvalue() const;
1911 * Get the variable that is ultimately referenced by an r-value
1913 virtual ir_variable
*variable_referenced() const = 0;
1916 * Get the constant that is ultimately referenced by an r-value,
1917 * in a constant expression evaluation context.
1919 * The offset is used when the reference is to a specific column of
1922 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const = 0;
1926 class ir_dereference_variable
: public ir_dereference
{
1928 ir_dereference_variable(ir_variable
*var
);
1930 virtual ir_dereference_variable
*clone(void *mem_ctx
,
1931 struct hash_table
*) const;
1933 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1935 virtual ir_dereference_variable
*as_dereference_variable()
1940 virtual bool equals(ir_instruction
*ir
);
1943 * Get the variable that is ultimately referenced by an r-value
1945 virtual ir_variable
*variable_referenced() const
1951 * Get the constant that is ultimately referenced by an r-value,
1952 * in a constant expression evaluation context.
1954 * The offset is used when the reference is to a specific column of
1957 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const;
1959 virtual ir_variable
*whole_variable_referenced()
1961 /* ir_dereference_variable objects always dereference the entire
1962 * variable. However, if this dereference is dereferenced by anything
1963 * else, the complete deferefernce chain is not a whole-variable
1964 * dereference. This method should only be called on the top most
1965 * ir_rvalue in a dereference chain.
1970 virtual void accept(ir_visitor
*v
)
1975 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1978 * Object being dereferenced.
1984 class ir_dereference_array
: public ir_dereference
{
1986 ir_dereference_array(ir_rvalue
*value
, ir_rvalue
*array_index
);
1988 ir_dereference_array(ir_variable
*var
, ir_rvalue
*array_index
);
1990 virtual ir_dereference_array
*clone(void *mem_ctx
,
1991 struct hash_table
*) const;
1993 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1995 virtual ir_dereference_array
*as_dereference_array()
2000 virtual bool equals(ir_instruction
*ir
);
2003 * Get the variable that is ultimately referenced by an r-value
2005 virtual ir_variable
*variable_referenced() const
2007 return this->array
->variable_referenced();
2011 * Get the constant that is ultimately referenced by an r-value,
2012 * in a constant expression evaluation context.
2014 * The offset is used when the reference is to a specific column of
2017 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const;
2019 virtual void accept(ir_visitor
*v
)
2024 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2027 ir_rvalue
*array_index
;
2030 void set_array(ir_rvalue
*value
);
2034 class ir_dereference_record
: public ir_dereference
{
2036 ir_dereference_record(ir_rvalue
*value
, const char *field
);
2038 ir_dereference_record(ir_variable
*var
, const char *field
);
2040 virtual ir_dereference_record
*clone(void *mem_ctx
,
2041 struct hash_table
*) const;
2043 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
2045 virtual ir_dereference_record
*as_dereference_record()
2051 * Get the variable that is ultimately referenced by an r-value
2053 virtual ir_variable
*variable_referenced() const
2055 return this->record
->variable_referenced();
2059 * Get the constant that is ultimately referenced by an r-value,
2060 * in a constant expression evaluation context.
2062 * The offset is used when the reference is to a specific column of
2065 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const;
2067 virtual void accept(ir_visitor
*v
)
2072 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2080 * Data stored in an ir_constant
2082 union ir_constant_data
{
2090 class ir_constant
: public ir_rvalue
{
2092 ir_constant(const struct glsl_type
*type
, const ir_constant_data
*data
);
2093 ir_constant(bool b
, unsigned vector_elements
=1);
2094 ir_constant(unsigned int u
, unsigned vector_elements
=1);
2095 ir_constant(int i
, unsigned vector_elements
=1);
2096 ir_constant(float f
, unsigned vector_elements
=1);
2099 * Construct an ir_constant from a list of ir_constant values
2101 ir_constant(const struct glsl_type
*type
, exec_list
*values
);
2104 * Construct an ir_constant from a scalar component of another ir_constant
2106 * The new \c ir_constant inherits the type of the component from the
2110 * In the case of a matrix constant, the new constant is a scalar, \b not
2113 ir_constant(const ir_constant
*c
, unsigned i
);
2116 * Return a new ir_constant of the specified type containing all zeros.
2118 static ir_constant
*zero(void *mem_ctx
, const glsl_type
*type
);
2120 virtual ir_constant
*clone(void *mem_ctx
, struct hash_table
*) const;
2122 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
2124 virtual ir_constant
*as_constant()
2129 virtual void accept(ir_visitor
*v
)
2134 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2136 virtual bool equals(ir_instruction
*ir
);
2139 * Get a particular component of a constant as a specific type
2141 * This is useful, for example, to get a value from an integer constant
2142 * as a float or bool. This appears frequently when constructors are
2143 * called with all constant parameters.
2146 bool get_bool_component(unsigned i
) const;
2147 float get_float_component(unsigned i
) const;
2148 int get_int_component(unsigned i
) const;
2149 unsigned get_uint_component(unsigned i
) const;
2152 ir_constant
*get_array_element(unsigned i
) const;
2154 ir_constant
*get_record_field(const char *name
);
2157 * Copy the values on another constant at a given offset.
2159 * The offset is ignored for array or struct copies, it's only for
2160 * scalars or vectors into vectors or matrices.
2162 * With identical types on both sides and zero offset it's clone()
2163 * without creating a new object.
2166 void copy_offset(ir_constant
*src
, int offset
);
2169 * Copy the values on another constant at a given offset and
2170 * following an assign-like mask.
2172 * The mask is ignored for scalars.
2174 * Note that this function only handles what assign can handle,
2175 * i.e. at most a vector as source and a column of a matrix as
2179 void copy_masked_offset(ir_constant
*src
, int offset
, unsigned int mask
);
2182 * Determine whether a constant has the same value as another constant
2184 * \sa ir_constant::is_zero, ir_constant::is_one,
2185 * ir_constant::is_negative_one, ir_constant::is_basis
2187 bool has_value(const ir_constant
*) const;
2189 virtual bool is_zero() const;
2190 virtual bool is_one() const;
2191 virtual bool is_negative_one() const;
2192 virtual bool is_basis() const;
2195 * Value of the constant.
2197 * The field used to back the values supplied by the constant is determined
2198 * by the type associated with the \c ir_instruction. Constants may be
2199 * scalars, vectors, or matrices.
2201 union ir_constant_data value
;
2203 /* Array elements */
2204 ir_constant
**array_elements
;
2206 /* Structure fields */
2207 exec_list components
;
2211 * Parameterless constructor only used by the clone method
2219 * IR instruction to emit a vertex in a geometry shader.
2221 class ir_emit_vertex
: public ir_instruction
{
2225 ir_type
= ir_type_emit_vertex
;
2228 virtual void accept(ir_visitor
*v
)
2233 virtual ir_emit_vertex
*clone(void *mem_ctx
, struct hash_table
*) const
2235 return new(mem_ctx
) ir_emit_vertex();
2238 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2242 * IR instruction to complete the current primitive and start a new one in a
2245 class ir_end_primitive
: public ir_instruction
{
2249 ir_type
= ir_type_end_primitive
;
2252 virtual void accept(ir_visitor
*v
)
2257 virtual ir_end_primitive
*clone(void *mem_ctx
, struct hash_table
*) const
2259 return new(mem_ctx
) ir_end_primitive();
2262 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2266 * Apply a visitor to each IR node in a list
2269 visit_exec_list(exec_list
*list
, ir_visitor
*visitor
);
2272 * Validate invariants on each IR node in a list
2274 void validate_ir_tree(exec_list
*instructions
);
2276 struct _mesa_glsl_parse_state
;
2277 struct gl_shader_program
;
2280 * Detect whether an unlinked shader contains static recursion
2282 * If the list of instructions is determined to contain static recursion,
2283 * \c _mesa_glsl_error will be called to emit error messages for each function
2284 * that is in the recursion cycle.
2287 detect_recursion_unlinked(struct _mesa_glsl_parse_state
*state
,
2288 exec_list
*instructions
);
2291 * Detect whether a linked shader contains static recursion
2293 * If the list of instructions is determined to contain static recursion,
2294 * \c link_error_printf will be called to emit error messages for each function
2295 * that is in the recursion cycle. In addition,
2296 * \c gl_shader_program::LinkStatus will be set to false.
2299 detect_recursion_linked(struct gl_shader_program
*prog
,
2300 exec_list
*instructions
);
2303 * Make a clone of each IR instruction in a list
2305 * \param in List of IR instructions that are to be cloned
2306 * \param out List to hold the cloned instructions
2309 clone_ir_list(void *mem_ctx
, exec_list
*out
, const exec_list
*in
);
2312 _mesa_glsl_initialize_variables(exec_list
*instructions
,
2313 struct _mesa_glsl_parse_state
*state
);
2316 _mesa_glsl_initialize_functions(_mesa_glsl_parse_state
*state
);
2319 _mesa_glsl_initialize_builtin_functions();
2321 extern ir_function_signature
*
2322 _mesa_glsl_find_builtin_function(_mesa_glsl_parse_state
*state
,
2323 const char *name
, exec_list
*actual_parameters
);
2326 _mesa_glsl_get_builtin_function_shader(void);
2329 _mesa_glsl_release_functions(void);
2332 _mesa_glsl_release_builtin_functions(void);
2335 reparent_ir(exec_list
*list
, void *mem_ctx
);
2337 struct glsl_symbol_table
;
2340 import_prototypes(const exec_list
*source
, exec_list
*dest
,
2341 struct glsl_symbol_table
*symbols
, void *mem_ctx
);
2344 ir_has_call(ir_instruction
*ir
);
2347 do_set_program_inouts(exec_list
*instructions
, struct gl_program
*prog
,
2348 GLenum shader_type
);
2351 prototype_string(const glsl_type
*return_type
, const char *name
,
2352 exec_list
*parameters
);
2355 mode_string(const ir_variable
*var
);
2358 #endif /* __cplusplus */
2360 extern void _mesa_print_ir(struct exec_list
*instructions
,
2361 struct _mesa_glsl_parse_state
*state
);
2368 vertices_per_prim(GLenum prim
);