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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.
62 ir_type_dereference_array
,
63 ir_type_dereference_record
,
64 ir_type_dereference_variable
,
73 ir_type_function_signature
,
80 ir_type_end_primitive
,
81 ir_type_max
, /**< maximum ir_type enum number, for validation */
82 ir_type_unset
= ir_type_max
87 * Base class of all IR instructions
89 class ir_instruction
: public exec_node
{
91 enum ir_node_type ir_type
;
94 * GCC 4.7+ and clang warn when deleting an ir_instruction unless
95 * there's a virtual destructor present. Because we almost
96 * universally use ralloc for our memory management of
97 * ir_instructions, the destructor doesn't need to do any work.
99 virtual ~ir_instruction()
103 /** ir_print_visitor helper for debugging. */
104 void print(void) const;
105 void fprint(FILE *f
) const;
107 virtual void accept(ir_visitor
*) = 0;
108 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*) = 0;
109 virtual ir_instruction
*clone(void *mem_ctx
,
110 struct hash_table
*ht
) const = 0;
113 * \name IR instruction downcast functions
115 * These functions either cast the object to a derived class or return
116 * \c NULL if the object's type does not match the specified derived class.
117 * Additional downcast functions will be added as needed.
120 class ir_rvalue
*as_rvalue()
122 if (ir_type
== ir_type_dereference_array
||
123 ir_type
== ir_type_dereference_record
||
124 ir_type
== ir_type_dereference_variable
||
125 ir_type
== ir_type_constant
||
126 ir_type
== ir_type_expression
||
127 ir_type
== ir_type_swizzle
||
128 ir_type
== ir_type_texture
)
129 return (class ir_rvalue
*) this;
133 class ir_dereference
*as_dereference()
135 if (ir_type
== ir_type_dereference_array
||
136 ir_type
== ir_type_dereference_record
||
137 ir_type
== ir_type_dereference_variable
)
138 return (class ir_dereference
*) this;
142 class ir_jump
*as_jump()
144 if (ir_type
== ir_type_loop_jump
||
145 ir_type
== ir_type_return
||
146 ir_type
== ir_type_discard
)
147 return (class ir_jump
*) this;
151 #define AS_CHILD(TYPE) \
152 class ir_##TYPE * as_##TYPE() \
154 return ir_type == ir_type_##TYPE ? (ir_##TYPE *) this : NULL; \
158 AS_CHILD(dereference_array
)
159 AS_CHILD(dereference_variable
)
160 AS_CHILD(dereference_record
)
175 * IR equality method: Return true if the referenced instruction would
176 * return the same value as this one.
178 * This intended to be used for CSE and algebraic optimizations, on rvalues
179 * in particular. No support for other instruction types (assignments,
180 * jumps, calls, etc.) is planned.
182 virtual bool equals(ir_instruction
*ir
, enum ir_node_type ignore
= ir_type_unset
);
185 ir_instruction(enum ir_node_type t
)
193 assert(!"Should not get here.");
199 * The base class for all "values"/expression trees.
201 class ir_rvalue
: public ir_instruction
{
203 const struct glsl_type
*type
;
205 virtual ir_rvalue
*clone(void *mem_ctx
, struct hash_table
*) const;
207 virtual void accept(ir_visitor
*v
)
212 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
214 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
216 ir_rvalue
*as_rvalue_to_saturate();
218 virtual bool is_lvalue() const
224 * Get the variable that is ultimately referenced by an r-value
226 virtual ir_variable
*variable_referenced() const
233 * If an r-value is a reference to a whole variable, get that variable
236 * Pointer to a variable that is completely dereferenced by the r-value. If
237 * the r-value is not a dereference or the dereference does not access the
238 * entire variable (i.e., it's just one array element, struct field), \c NULL
241 virtual ir_variable
*whole_variable_referenced()
247 * Determine if an r-value has the value zero
249 * The base implementation of this function always returns \c false. The
250 * \c ir_constant class over-rides this function to return \c true \b only
251 * for vector and scalar types that have all elements set to the value
252 * zero (or \c false for booleans).
254 * \sa ir_constant::has_value, ir_rvalue::is_one, ir_rvalue::is_negative_one,
255 * ir_constant::is_basis
257 virtual bool is_zero() const;
260 * Determine if an r-value has the value one
262 * The base implementation of this function always returns \c false. The
263 * \c ir_constant class over-rides this function to return \c true \b only
264 * for vector and scalar types that have all elements set to the value
265 * one (or \c true for booleans).
267 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_negative_one,
268 * ir_constant::is_basis
270 virtual bool is_one() const;
273 * Determine if an r-value has the value negative one
275 * The base implementation of this function always returns \c false. The
276 * \c ir_constant class over-rides this function to return \c true \b only
277 * for vector and scalar types that have all elements set to the value
278 * negative one. For boolean types, the result is always \c false.
280 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one
281 * ir_constant::is_basis
283 virtual bool is_negative_one() const;
286 * Determine if an r-value is a basis vector
288 * The base implementation of this function always returns \c false. The
289 * \c ir_constant class over-rides this function to return \c true \b only
290 * for vector and scalar types that have one element set to the value one,
291 * and the other elements set to the value zero. For boolean types, the
292 * result is always \c false.
294 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one,
295 * is_constant::is_negative_one
297 virtual bool is_basis() const;
300 * Determine if an r-value is an unsigned integer constant which can be
303 * \sa ir_constant::is_uint16_constant.
305 virtual bool is_uint16_constant() const { return false; }
308 * Return a generic value of error_type.
310 * Allocation will be performed with 'mem_ctx' as ralloc owner.
312 static ir_rvalue
*error_value(void *mem_ctx
);
315 ir_rvalue(enum ir_node_type t
);
320 * Variable storage classes
322 enum ir_variable_mode
{
323 ir_var_auto
= 0, /**< Function local variables and globals. */
324 ir_var_uniform
, /**< Variable declared as a uniform. */
329 ir_var_function_inout
,
330 ir_var_const_in
, /**< "in" param that must be a constant expression */
331 ir_var_system_value
, /**< Ex: front-face, instance-id, etc. */
332 ir_var_temporary
, /**< Temporary variable generated during compilation. */
333 ir_var_mode_count
/**< Number of variable modes */
337 * Enum keeping track of how a variable was declared. For error checking of
338 * the gl_PerVertex redeclaration rules.
340 enum ir_var_declaration_type
{
342 * Normal declaration (for most variables, this means an explicit
343 * declaration. Exception: temporaries are always implicitly declared, but
344 * they still use ir_var_declared_normally).
346 * Note: an ir_variable that represents a named interface block uses
347 * ir_var_declared_normally.
349 ir_var_declared_normally
= 0,
352 * Variable was explicitly declared (or re-declared) in an unnamed
355 ir_var_declared_in_block
,
358 * Variable is an implicitly declared built-in that has not been explicitly
359 * re-declared by the shader.
361 ir_var_declared_implicitly
,
365 * \brief Layout qualifiers for gl_FragDepth.
367 * The AMD/ARB_conservative_depth extensions allow gl_FragDepth to be redeclared
368 * with a layout qualifier.
370 enum ir_depth_layout
{
371 ir_depth_layout_none
, /**< No depth layout is specified. */
373 ir_depth_layout_greater
,
374 ir_depth_layout_less
,
375 ir_depth_layout_unchanged
379 * \brief Convert depth layout qualifier to string.
382 depth_layout_string(ir_depth_layout layout
);
385 * Description of built-in state associated with a uniform
387 * \sa ir_variable::state_slots
389 struct ir_state_slot
{
396 * Get the string value for an interpolation qualifier
398 * \return The string that would be used in a shader to specify \c
399 * mode will be returned.
401 * This function is used to generate error messages of the form "shader
402 * uses %s interpolation qualifier", so in the case where there is no
403 * interpolation qualifier, it returns "no".
405 * This function should only be used on a shader input or output variable.
407 const char *interpolation_string(unsigned interpolation
);
410 class ir_variable
: public ir_instruction
{
412 ir_variable(const struct glsl_type
*, const char *, ir_variable_mode
);
414 virtual ir_variable
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
416 virtual void accept(ir_visitor
*v
)
421 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
425 * Determine how this variable should be interpolated based on its
426 * interpolation qualifier (if present), whether it is gl_Color or
427 * gl_SecondaryColor, and whether flatshading is enabled in the current GL
430 * The return value will always be either INTERP_QUALIFIER_SMOOTH,
431 * INTERP_QUALIFIER_NOPERSPECTIVE, or INTERP_QUALIFIER_FLAT.
433 glsl_interp_qualifier
determine_interpolation_mode(bool flat_shade
);
436 * Determine whether or not a variable is part of a uniform block.
438 inline bool is_in_uniform_block() const
440 return this->data
.mode
== ir_var_uniform
&& this->interface_type
!= NULL
;
444 * Determine whether or not a variable is the declaration of an interface
447 * For the first declaration below, there will be an \c ir_variable named
448 * "instance" whose type and whose instance_type will be the same
449 * \cglsl_type. For the second declaration, there will be an \c ir_variable
450 * named "f" whose type is float and whose instance_type is B2.
452 * "instance" is an interface instance variable, but "f" is not.
462 inline bool is_interface_instance() const
464 const glsl_type
*const t
= this->type
;
466 return (t
== this->interface_type
)
467 || (t
->is_array() && t
->fields
.array
== this->interface_type
);
471 * Set this->interface_type on a newly created variable.
473 void init_interface_type(const struct glsl_type
*type
)
475 assert(this->interface_type
== NULL
);
476 this->interface_type
= type
;
477 if (this->is_interface_instance()) {
478 this->max_ifc_array_access
=
479 rzalloc_array(this, unsigned, type
->length
);
484 * Change this->interface_type on a variable that previously had a
485 * different, but compatible, interface_type. This is used during linking
486 * to set the size of arrays in interface blocks.
488 void change_interface_type(const struct glsl_type
*type
)
490 if (this->max_ifc_array_access
!= NULL
) {
491 /* max_ifc_array_access has already been allocated, so make sure the
492 * new interface has the same number of fields as the old one.
494 assert(this->interface_type
->length
== type
->length
);
496 this->interface_type
= type
;
500 * Change this->interface_type on a variable that previously had a
501 * different, and incompatible, interface_type. This is used during
502 * compilation to handle redeclaration of the built-in gl_PerVertex
505 void reinit_interface_type(const struct glsl_type
*type
)
507 if (this->max_ifc_array_access
!= NULL
) {
509 /* Redeclaring gl_PerVertex is only allowed if none of the built-ins
510 * it defines have been accessed yet; so it's safe to throw away the
511 * old max_ifc_array_access pointer, since all of its values are
514 for (unsigned i
= 0; i
< this->interface_type
->length
; i
++)
515 assert(this->max_ifc_array_access
[i
] == 0);
517 ralloc_free(this->max_ifc_array_access
);
518 this->max_ifc_array_access
= NULL
;
520 this->interface_type
= NULL
;
521 init_interface_type(type
);
524 const glsl_type
*get_interface_type() const
526 return this->interface_type
;
530 * Declared type of the variable
532 const struct glsl_type
*type
;
535 * Declared name of the variable
540 * For variables which satisfy the is_interface_instance() predicate, this
541 * points to an array of integers such that if the ith member of the
542 * interface block is an array, max_ifc_array_access[i] is the maximum
543 * array element of that member that has been accessed. If the ith member
544 * of the interface block is not an array, max_ifc_array_access[i] is
547 * For variables whose type is not an interface block, this pointer is
550 unsigned *max_ifc_array_access
;
552 struct ir_variable_data
{
555 * Is the variable read-only?
557 * This is set for variables declared as \c const, shader inputs,
560 unsigned read_only
:1;
563 unsigned invariant
:1;
567 * Has this variable been used for reading or writing?
569 * Several GLSL semantic checks require knowledge of whether or not a
570 * variable has been used. For example, it is an error to redeclare a
571 * variable as invariant after it has been used.
573 * This is only maintained in the ast_to_hir.cpp path, not in
574 * Mesa's fixed function or ARB program paths.
579 * Has this variable been statically assigned?
581 * This answers whether the variable was assigned in any path of
582 * the shader during ast_to_hir. This doesn't answer whether it is
583 * still written after dead code removal, nor is it maintained in
584 * non-ast_to_hir.cpp (GLSL parsing) paths.
589 * Enum indicating how the variable was declared. See
590 * ir_var_declaration_type.
592 * This is used to detect certain kinds of illegal variable redeclarations.
594 unsigned how_declared
:2;
597 * Storage class of the variable.
599 * \sa ir_variable_mode
604 * Interpolation mode for shader inputs / outputs
606 * \sa ir_variable_interpolation
608 unsigned interpolation
:2;
611 * \name ARB_fragment_coord_conventions
614 unsigned origin_upper_left
:1;
615 unsigned pixel_center_integer
:1;
619 * Was the location explicitly set in the shader?
621 * If the location is explicitly set in the shader, it \b cannot be changed
622 * by the linker or by the API (e.g., calls to \c glBindAttribLocation have
625 unsigned explicit_location
:1;
626 unsigned explicit_index
:1;
629 * Was an initial binding explicitly set in the shader?
631 * If so, constant_value contains an integer ir_constant representing the
632 * initial binding point.
634 unsigned explicit_binding
:1;
637 * Does this variable have an initializer?
639 * This is used by the linker to cross-validiate initializers of global
642 unsigned has_initializer
:1;
645 * Is this variable a generic output or input that has not yet been matched
646 * up to a variable in another stage of the pipeline?
648 * This is used by the linker as scratch storage while assigning locations
649 * to generic inputs and outputs.
651 unsigned is_unmatched_generic_inout
:1;
654 * If non-zero, then this variable may be packed along with other variables
655 * into a single varying slot, so this offset should be applied when
656 * accessing components. For example, an offset of 1 means that the x
657 * component of this variable is actually stored in component y of the
658 * location specified by \c location.
660 unsigned location_frac
:2;
663 * Non-zero if this variable was created by lowering a named interface
664 * block which was not an array.
666 * Note that this variable and \c from_named_ifc_block_array will never
669 unsigned from_named_ifc_block_nonarray
:1;
672 * Non-zero if this variable was created by lowering a named interface
673 * block which was an array.
675 * Note that this variable and \c from_named_ifc_block_nonarray will never
678 unsigned from_named_ifc_block_array
:1;
681 * \brief Layout qualifier for gl_FragDepth.
683 * This is not equal to \c ir_depth_layout_none if and only if this
684 * variable is \c gl_FragDepth and a layout qualifier is specified.
686 ir_depth_layout depth_layout
;
689 * Storage location of the base of this variable
691 * The precise meaning of this field depends on the nature of the variable.
693 * - Vertex shader input: one of the values from \c gl_vert_attrib.
694 * - Vertex shader output: one of the values from \c gl_varying_slot.
695 * - Geometry shader input: one of the values from \c gl_varying_slot.
696 * - Geometry shader output: one of the values from \c gl_varying_slot.
697 * - Fragment shader input: one of the values from \c gl_varying_slot.
698 * - Fragment shader output: one of the values from \c gl_frag_result.
699 * - Uniforms: Per-stage uniform slot number for default uniform block.
700 * - Uniforms: Index within the uniform block definition for UBO members.
701 * - Other: This field is not currently used.
703 * If the variable is a uniform, shader input, or shader output, and the
704 * slot has not been assigned, the value will be -1.
709 * Vertex stream output identifier.
714 * output index for dual source blending.
719 * Initial binding point for a sampler or UBO.
721 * For array types, this represents the binding point for the first element.
726 * Location an atomic counter is stored at.
729 unsigned buffer_index
;
734 * ARB_shader_image_load_store qualifiers.
737 bool read_only
; /**< "readonly" qualifier. */
738 bool write_only
; /**< "writeonly" qualifier. */
743 /** Image internal format if specified explicitly, otherwise GL_NONE. */
748 * Highest element accessed with a constant expression array index
750 * Not used for non-array variables.
752 unsigned max_array_access
;
757 * Built-in state that backs this uniform
759 * Once set at variable creation, \c state_slots must remain invariant.
760 * This is because, ideally, this array would be shared by all clones of
761 * this variable in the IR tree. In other words, we'd really like for it
762 * to be a fly-weight.
764 * If the variable is not a uniform, \c num_state_slots will be zero and
765 * \c state_slots will be \c NULL.
768 unsigned num_state_slots
; /**< Number of state slots used */
769 ir_state_slot
*state_slots
; /**< State descriptors. */
773 * Emit a warning if this variable is accessed.
775 const char *warn_extension
;
778 * Value assigned in the initializer of a variable declared "const"
780 ir_constant
*constant_value
;
783 * Constant expression assigned in the initializer of the variable
786 * This field and \c ::constant_value are distinct. Even if the two fields
787 * refer to constants with the same value, they must point to separate
790 ir_constant
*constant_initializer
;
794 * For variables that are in an interface block or are an instance of an
795 * interface block, this is the \c GLSL_TYPE_INTERFACE type for that block.
797 * \sa ir_variable::location
799 const glsl_type
*interface_type
;
803 * A function that returns whether a built-in function is available in the
804 * current shading language (based on version, ES or desktop, and extensions).
806 typedef bool (*builtin_available_predicate
)(const _mesa_glsl_parse_state
*);
810 * The representation of a function instance; may be the full definition or
811 * simply a prototype.
813 class ir_function_signature
: public ir_instruction
{
814 /* An ir_function_signature will be part of the list of signatures in
818 ir_function_signature(const glsl_type
*return_type
,
819 builtin_available_predicate builtin_avail
= NULL
);
821 virtual ir_function_signature
*clone(void *mem_ctx
,
822 struct hash_table
*ht
) const;
823 ir_function_signature
*clone_prototype(void *mem_ctx
,
824 struct hash_table
*ht
) const;
826 virtual void accept(ir_visitor
*v
)
831 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
834 * Attempt to evaluate this function as a constant expression,
835 * given a list of the actual parameters and the variable context.
836 * Returns NULL for non-built-ins.
838 ir_constant
*constant_expression_value(exec_list
*actual_parameters
, struct hash_table
*variable_context
);
841 * Get the name of the function for which this is a signature
843 const char *function_name() const;
846 * Get a handle to the function for which this is a signature
848 * There is no setter function, this function returns a \c const pointer,
849 * and \c ir_function_signature::_function is private for a reason. The
850 * only way to make a connection between a function and function signature
851 * is via \c ir_function::add_signature. This helps ensure that certain
852 * invariants (i.e., a function signature is in the list of signatures for
853 * its \c _function) are met.
855 * \sa ir_function::add_signature
857 inline const class ir_function
*function() const
859 return this->_function
;
863 * Check whether the qualifiers match between this signature's parameters
864 * and the supplied parameter list. If not, returns the name of the first
865 * parameter with mismatched qualifiers (for use in error messages).
867 const char *qualifiers_match(exec_list
*params
);
870 * Replace the current parameter list with the given one. This is useful
871 * if the current information came from a prototype, and either has invalid
872 * or missing parameter names.
874 void replace_parameters(exec_list
*new_params
);
877 * Function return type.
879 * \note This discards the optional precision qualifier.
881 const struct glsl_type
*return_type
;
884 * List of ir_variable of function parameters.
886 * This represents the storage. The paramaters passed in a particular
887 * call will be in ir_call::actual_paramaters.
889 struct exec_list parameters
;
891 /** Whether or not this function has a body (which may be empty). */
892 unsigned is_defined
:1;
894 /** Whether or not this function signature is a built-in. */
895 bool is_builtin() const;
898 * Whether or not this function is an intrinsic to be implemented
903 /** Whether or not a built-in is available for this shader. */
904 bool is_builtin_available(const _mesa_glsl_parse_state
*state
) const;
906 /** Body of instructions in the function. */
907 struct exec_list body
;
911 * A function pointer to a predicate that answers whether a built-in
912 * function is available in the current shader. NULL if not a built-in.
914 builtin_available_predicate builtin_avail
;
916 /** Function of which this signature is one overload. */
917 class ir_function
*_function
;
919 /** Function signature of which this one is a prototype clone */
920 const ir_function_signature
*origin
;
922 friend class ir_function
;
925 * Helper function to run a list of instructions for constant
926 * expression evaluation.
928 * The hash table represents the values of the visible variables.
929 * There are no scoping issues because the table is indexed on
930 * ir_variable pointers, not variable names.
932 * Returns false if the expression is not constant, true otherwise,
933 * and the value in *result if result is non-NULL.
935 bool constant_expression_evaluate_expression_list(const struct exec_list
&body
,
936 struct hash_table
*variable_context
,
937 ir_constant
**result
);
942 * Header for tracking multiple overloaded functions with the same name.
943 * Contains a list of ir_function_signatures representing each of the
946 class ir_function
: public ir_instruction
{
948 ir_function(const char *name
);
950 virtual ir_function
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
952 virtual void accept(ir_visitor
*v
)
957 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
959 void add_signature(ir_function_signature
*sig
)
961 sig
->_function
= this;
962 this->signatures
.push_tail(sig
);
966 * Find a signature that matches a set of actual parameters, taking implicit
967 * conversions into account. Also flags whether the match was exact.
969 ir_function_signature
*matching_signature(_mesa_glsl_parse_state
*state
,
970 const exec_list
*actual_param
,
971 bool *match_is_exact
);
974 * Find a signature that matches a set of actual parameters, taking implicit
975 * conversions into account.
977 ir_function_signature
*matching_signature(_mesa_glsl_parse_state
*state
,
978 const exec_list
*actual_param
);
981 * Find a signature that exactly matches a set of actual parameters without
982 * any implicit type conversions.
984 ir_function_signature
*exact_matching_signature(_mesa_glsl_parse_state
*state
,
985 const exec_list
*actual_ps
);
988 * Name of the function.
992 /** Whether or not this function has a signature that isn't a built-in. */
993 bool has_user_signature();
996 * List of ir_function_signature for each overloaded function with this name.
998 struct exec_list signatures
;
1001 inline const char *ir_function_signature::function_name() const
1003 return this->_function
->name
;
1009 * IR instruction representing high-level if-statements
1011 class ir_if
: public ir_instruction
{
1013 ir_if(ir_rvalue
*condition
)
1014 : ir_instruction(ir_type_if
), condition(condition
)
1018 virtual ir_if
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1020 virtual void accept(ir_visitor
*v
)
1025 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1027 ir_rvalue
*condition
;
1028 /** List of ir_instruction for the body of the then branch */
1029 exec_list then_instructions
;
1030 /** List of ir_instruction for the body of the else branch */
1031 exec_list else_instructions
;
1036 * IR instruction representing a high-level loop structure.
1038 class ir_loop
: public ir_instruction
{
1042 virtual ir_loop
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1044 virtual void accept(ir_visitor
*v
)
1049 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1051 /** List of ir_instruction that make up the body of the loop. */
1052 exec_list body_instructions
;
1056 class ir_assignment
: public ir_instruction
{
1058 ir_assignment(ir_rvalue
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
= NULL
);
1061 * Construct an assignment with an explicit write mask
1064 * Since a write mask is supplied, the LHS must already be a bare
1065 * \c ir_dereference. The cannot be any swizzles in the LHS.
1067 ir_assignment(ir_dereference
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
,
1068 unsigned write_mask
);
1070 virtual ir_assignment
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1072 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1074 virtual void accept(ir_visitor
*v
)
1079 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1082 * Get a whole variable written by an assignment
1084 * If the LHS of the assignment writes a whole variable, the variable is
1085 * returned. Otherwise \c NULL is returned. Examples of whole-variable
1088 * - Assigning to a scalar
1089 * - Assigning to all components of a vector
1090 * - Whole array (or matrix) assignment
1091 * - Whole structure assignment
1093 ir_variable
*whole_variable_written();
1096 * Set the LHS of an assignment
1098 void set_lhs(ir_rvalue
*lhs
);
1101 * Left-hand side of the assignment.
1103 * This should be treated as read only. If you need to set the LHS of an
1104 * assignment, use \c ir_assignment::set_lhs.
1106 ir_dereference
*lhs
;
1109 * Value being assigned
1114 * Optional condition for the assignment.
1116 ir_rvalue
*condition
;
1120 * Component mask written
1122 * For non-vector types in the LHS, this field will be zero. For vector
1123 * types, a bit will be set for each component that is written. Note that
1124 * for \c vec2 and \c vec3 types only the lower bits will ever be set.
1126 * A partially-set write mask means that each enabled channel gets
1127 * the value from a consecutive channel of the rhs. For example,
1128 * to write just .xyw of gl_FrontColor with color:
1130 * (assign (constant bool (1)) (xyw)
1131 * (var_ref gl_FragColor)
1132 * (swiz xyw (var_ref color)))
1134 unsigned write_mask
:4;
1137 /* Update ir_expression::get_num_operands() and operator_strs when
1138 * updating this list.
1140 enum ir_expression_operation
{
1149 ir_unop_exp
, /**< Log base e on gentype */
1150 ir_unop_log
, /**< Natural log on gentype */
1153 ir_unop_f2i
, /**< Float-to-integer conversion. */
1154 ir_unop_f2u
, /**< Float-to-unsigned conversion. */
1155 ir_unop_i2f
, /**< Integer-to-float conversion. */
1156 ir_unop_f2b
, /**< Float-to-boolean conversion */
1157 ir_unop_b2f
, /**< Boolean-to-float conversion */
1158 ir_unop_i2b
, /**< int-to-boolean conversion */
1159 ir_unop_b2i
, /**< Boolean-to-int conversion */
1160 ir_unop_u2f
, /**< Unsigned-to-float conversion. */
1161 ir_unop_i2u
, /**< Integer-to-unsigned conversion. */
1162 ir_unop_u2i
, /**< Unsigned-to-integer conversion. */
1163 ir_unop_bitcast_i2f
, /**< Bit-identical int-to-float "conversion" */
1164 ir_unop_bitcast_f2i
, /**< Bit-identical float-to-int "conversion" */
1165 ir_unop_bitcast_u2f
, /**< Bit-identical uint-to-float "conversion" */
1166 ir_unop_bitcast_f2u
, /**< Bit-identical float-to-uint "conversion" */
1170 * \name Unary floating-point rounding operations.
1181 * \name Trigonometric operations.
1186 ir_unop_sin_reduced
, /**< Reduced range sin. [-pi, pi] */
1187 ir_unop_cos_reduced
, /**< Reduced range cos. [-pi, pi] */
1191 * \name Partial derivatives.
1199 * \name Floating point pack and unpack operations.
1202 ir_unop_pack_snorm_2x16
,
1203 ir_unop_pack_snorm_4x8
,
1204 ir_unop_pack_unorm_2x16
,
1205 ir_unop_pack_unorm_4x8
,
1206 ir_unop_pack_half_2x16
,
1207 ir_unop_unpack_snorm_2x16
,
1208 ir_unop_unpack_snorm_4x8
,
1209 ir_unop_unpack_unorm_2x16
,
1210 ir_unop_unpack_unorm_4x8
,
1211 ir_unop_unpack_half_2x16
,
1215 * \name Lowered floating point unpacking operations.
1217 * \see lower_packing_builtins_visitor::split_unpack_half_2x16
1220 ir_unop_unpack_half_2x16_split_x
,
1221 ir_unop_unpack_half_2x16_split_y
,
1225 * \name Bit operations, part of ARB_gpu_shader5.
1228 ir_unop_bitfield_reverse
,
1237 * A sentinel marking the last of the unary operations.
1239 ir_last_unop
= ir_unop_noise
,
1243 ir_binop_mul
, /**< Floating-point or low 32-bit integer multiply. */
1244 ir_binop_imul_high
, /**< Calculates the high 32-bits of a 64-bit multiply. */
1248 * Returns the carry resulting from the addition of the two arguments.
1255 * Returns the borrow resulting from the subtraction of the second argument
1256 * from the first argument.
1263 * Takes one of two combinations of arguments:
1266 * - mod(vecN, float)
1268 * Does not take integer types.
1273 * \name Binary comparison operators which return a boolean vector.
1274 * The type of both operands must be equal.
1284 * Returns single boolean for whether all components of operands[0]
1285 * equal the components of operands[1].
1289 * Returns single boolean for whether any component of operands[0]
1290 * is not equal to the corresponding component of operands[1].
1292 ir_binop_any_nequal
,
1296 * \name Bit-wise binary operations.
1317 * \name Lowered floating point packing operations.
1319 * \see lower_packing_builtins_visitor::split_pack_half_2x16
1322 ir_binop_pack_half_2x16_split
,
1326 * \name First half of a lowered bitfieldInsert() operation.
1328 * \see lower_instructions::bitfield_insert_to_bfm_bfi
1335 * Load a value the size of a given GLSL type from a uniform block.
1337 * operand0 is the ir_constant uniform block index in the linked shader.
1338 * operand1 is a byte offset within the uniform block.
1343 * \name Multiplies a number by two to a power, part of ARB_gpu_shader5.
1350 * Extract a scalar from a vector
1352 * operand0 is the vector
1353 * operand1 is the index of the field to read from operand0
1355 ir_binop_vector_extract
,
1358 * A sentinel marking the last of the binary operations.
1360 ir_last_binop
= ir_binop_vector_extract
,
1363 * \name Fused floating-point multiply-add, part of ARB_gpu_shader5.
1372 * \name Conditional Select
1374 * A vector conditional select instruction (like ?:, but operating per-
1375 * component on vectors).
1377 * \see lower_instructions_visitor::ldexp_to_arith
1384 * \name Second half of a lowered bitfieldInsert() operation.
1386 * \see lower_instructions::bitfield_insert_to_bfm_bfi
1392 ir_triop_bitfield_extract
,
1395 * Generate a value with one field of a vector changed
1397 * operand0 is the vector
1398 * operand1 is the value to write into the vector result
1399 * operand2 is the index in operand0 to be modified
1401 ir_triop_vector_insert
,
1404 * A sentinel marking the last of the ternary operations.
1406 ir_last_triop
= ir_triop_vector_insert
,
1408 ir_quadop_bitfield_insert
,
1413 * A sentinel marking the last of the ternary operations.
1415 ir_last_quadop
= ir_quadop_vector
,
1418 * A sentinel marking the last of all operations.
1420 ir_last_opcode
= ir_quadop_vector
1423 class ir_expression
: public ir_rvalue
{
1425 ir_expression(int op
, const struct glsl_type
*type
,
1426 ir_rvalue
*op0
, ir_rvalue
*op1
= NULL
,
1427 ir_rvalue
*op2
= NULL
, ir_rvalue
*op3
= NULL
);
1430 * Constructor for unary operation expressions
1432 ir_expression(int op
, ir_rvalue
*);
1435 * Constructor for binary operation expressions
1437 ir_expression(int op
, ir_rvalue
*op0
, ir_rvalue
*op1
);
1440 * Constructor for ternary operation expressions
1442 ir_expression(int op
, ir_rvalue
*op0
, ir_rvalue
*op1
, ir_rvalue
*op2
);
1444 virtual bool equals(ir_instruction
*ir
, enum ir_node_type ignore
= ir_type_unset
);
1446 virtual ir_expression
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1449 * Attempt to constant-fold the expression
1451 * The "variable_context" hash table links ir_variable * to ir_constant *
1452 * that represent the variables' values. \c NULL represents an empty
1455 * If the expression cannot be constant folded, this method will return
1458 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1461 * Determine the number of operands used by an expression
1463 static unsigned int get_num_operands(ir_expression_operation
);
1466 * Determine the number of operands used by an expression
1468 unsigned int get_num_operands() const
1470 return (this->operation
== ir_quadop_vector
)
1471 ? this->type
->vector_elements
: get_num_operands(operation
);
1475 * Return whether the expression operates on vectors horizontally.
1477 bool is_horizontal() const
1479 return operation
== ir_binop_all_equal
||
1480 operation
== ir_binop_any_nequal
||
1481 operation
== ir_unop_any
||
1482 operation
== ir_binop_dot
||
1483 operation
== ir_quadop_vector
;
1487 * Return a string representing this expression's operator.
1489 const char *operator_string();
1492 * Return a string representing this expression's operator.
1494 static const char *operator_string(ir_expression_operation
);
1498 * Do a reverse-lookup to translate the given string into an operator.
1500 static ir_expression_operation
get_operator(const char *);
1502 virtual void accept(ir_visitor
*v
)
1507 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1509 ir_expression_operation operation
;
1510 ir_rvalue
*operands
[4];
1515 * HIR instruction representing a high-level function call, containing a list
1516 * of parameters and returning a value in the supplied temporary.
1518 class ir_call
: public ir_instruction
{
1520 ir_call(ir_function_signature
*callee
,
1521 ir_dereference_variable
*return_deref
,
1522 exec_list
*actual_parameters
)
1523 : ir_instruction(ir_type_call
), return_deref(return_deref
), callee(callee
)
1525 assert(callee
->return_type
!= NULL
);
1526 actual_parameters
->move_nodes_to(& this->actual_parameters
);
1527 this->use_builtin
= callee
->is_builtin();
1530 virtual ir_call
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1532 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1534 virtual void accept(ir_visitor
*v
)
1539 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1542 * Get the name of the function being called.
1544 const char *callee_name() const
1546 return callee
->function_name();
1550 * Generates an inline version of the function before @ir,
1551 * storing the return value in return_deref.
1553 void generate_inline(ir_instruction
*ir
);
1556 * Storage for the function's return value.
1557 * This must be NULL if the return type is void.
1559 ir_dereference_variable
*return_deref
;
1562 * The specific function signature being called.
1564 ir_function_signature
*callee
;
1566 /* List of ir_rvalue of paramaters passed in this call. */
1567 exec_list actual_parameters
;
1569 /** Should this call only bind to a built-in function? */
1575 * \name Jump-like IR instructions.
1577 * These include \c break, \c continue, \c return, and \c discard.
1580 class ir_jump
: public ir_instruction
{
1582 ir_jump(enum ir_node_type t
)
1588 class ir_return
: public ir_jump
{
1591 : ir_jump(ir_type_return
), value(NULL
)
1595 ir_return(ir_rvalue
*value
)
1596 : ir_jump(ir_type_return
), value(value
)
1600 virtual ir_return
*clone(void *mem_ctx
, struct hash_table
*) const;
1602 ir_rvalue
*get_value() const
1607 virtual void accept(ir_visitor
*v
)
1612 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1619 * Jump instructions used inside loops
1621 * These include \c break and \c continue. The \c break within a loop is
1622 * different from the \c break within a switch-statement.
1624 * \sa ir_switch_jump
1626 class ir_loop_jump
: public ir_jump
{
1633 ir_loop_jump(jump_mode mode
)
1634 : ir_jump(ir_type_loop_jump
)
1639 virtual ir_loop_jump
*clone(void *mem_ctx
, struct hash_table
*) const;
1641 virtual void accept(ir_visitor
*v
)
1646 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1648 bool is_break() const
1650 return mode
== jump_break
;
1653 bool is_continue() const
1655 return mode
== jump_continue
;
1658 /** Mode selector for the jump instruction. */
1659 enum jump_mode mode
;
1663 * IR instruction representing discard statements.
1665 class ir_discard
: public ir_jump
{
1668 : ir_jump(ir_type_discard
)
1670 this->condition
= NULL
;
1673 ir_discard(ir_rvalue
*cond
)
1674 : ir_jump(ir_type_discard
)
1676 this->condition
= cond
;
1679 virtual ir_discard
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1681 virtual void accept(ir_visitor
*v
)
1686 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1688 ir_rvalue
*condition
;
1694 * Texture sampling opcodes used in ir_texture
1696 enum ir_texture_opcode
{
1697 ir_tex
, /**< Regular texture look-up */
1698 ir_txb
, /**< Texture look-up with LOD bias */
1699 ir_txl
, /**< Texture look-up with explicit LOD */
1700 ir_txd
, /**< Texture look-up with partial derivatvies */
1701 ir_txf
, /**< Texel fetch with explicit LOD */
1702 ir_txf_ms
, /**< Multisample texture fetch */
1703 ir_txs
, /**< Texture size */
1704 ir_lod
, /**< Texture lod query */
1705 ir_tg4
, /**< Texture gather */
1706 ir_query_levels
/**< Texture levels query */
1711 * IR instruction to sample a texture
1713 * The specific form of the IR instruction depends on the \c mode value
1714 * selected from \c ir_texture_opcodes. In the printed IR, these will
1717 * Texel offset (0 or an expression)
1718 * | Projection divisor
1719 * | | Shadow comparitor
1722 * (tex <type> <sampler> <coordinate> 0 1 ( ))
1723 * (txb <type> <sampler> <coordinate> 0 1 ( ) <bias>)
1724 * (txl <type> <sampler> <coordinate> 0 1 ( ) <lod>)
1725 * (txd <type> <sampler> <coordinate> 0 1 ( ) (dPdx dPdy))
1726 * (txf <type> <sampler> <coordinate> 0 <lod>)
1728 * <type> <sampler> <coordinate> <sample_index>)
1729 * (txs <type> <sampler> <lod>)
1730 * (lod <type> <sampler> <coordinate>)
1731 * (tg4 <type> <sampler> <coordinate> <offset> <component>)
1732 * (query_levels <type> <sampler>)
1734 class ir_texture
: public ir_rvalue
{
1736 ir_texture(enum ir_texture_opcode op
)
1737 : ir_rvalue(ir_type_texture
),
1738 op(op
), sampler(NULL
), coordinate(NULL
), projector(NULL
),
1739 shadow_comparitor(NULL
), offset(NULL
)
1741 memset(&lod_info
, 0, sizeof(lod_info
));
1744 virtual ir_texture
*clone(void *mem_ctx
, struct hash_table
*) const;
1746 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1748 virtual void accept(ir_visitor
*v
)
1753 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1755 virtual bool equals(ir_instruction
*ir
, enum ir_node_type ignore
= ir_type_unset
);
1758 * Return a string representing the ir_texture_opcode.
1760 const char *opcode_string();
1762 /** Set the sampler and type. */
1763 void set_sampler(ir_dereference
*sampler
, const glsl_type
*type
);
1766 * Do a reverse-lookup to translate a string into an ir_texture_opcode.
1768 static ir_texture_opcode
get_opcode(const char *);
1770 enum ir_texture_opcode op
;
1772 /** Sampler to use for the texture access. */
1773 ir_dereference
*sampler
;
1775 /** Texture coordinate to sample */
1776 ir_rvalue
*coordinate
;
1779 * Value used for projective divide.
1781 * If there is no projective divide (the common case), this will be
1782 * \c NULL. Optimization passes should check for this to point to a constant
1783 * of 1.0 and replace that with \c NULL.
1785 ir_rvalue
*projector
;
1788 * Coordinate used for comparison on shadow look-ups.
1790 * If there is no shadow comparison, this will be \c NULL. For the
1791 * \c ir_txf opcode, this *must* be \c NULL.
1793 ir_rvalue
*shadow_comparitor
;
1795 /** Texel offset. */
1799 ir_rvalue
*lod
; /**< Floating point LOD */
1800 ir_rvalue
*bias
; /**< Floating point LOD bias */
1801 ir_rvalue
*sample_index
; /**< MSAA sample index */
1802 ir_rvalue
*component
; /**< Gather component selector */
1804 ir_rvalue
*dPdx
; /**< Partial derivative of coordinate wrt X */
1805 ir_rvalue
*dPdy
; /**< Partial derivative of coordinate wrt Y */
1811 struct ir_swizzle_mask
{
1818 * Number of components in the swizzle.
1820 unsigned num_components
:3;
1823 * Does the swizzle contain duplicate components?
1825 * L-value swizzles cannot contain duplicate components.
1827 unsigned has_duplicates
:1;
1831 class ir_swizzle
: public ir_rvalue
{
1833 ir_swizzle(ir_rvalue
*, unsigned x
, unsigned y
, unsigned z
, unsigned w
,
1836 ir_swizzle(ir_rvalue
*val
, const unsigned *components
, unsigned count
);
1838 ir_swizzle(ir_rvalue
*val
, ir_swizzle_mask mask
);
1840 virtual ir_swizzle
*clone(void *mem_ctx
, struct hash_table
*) const;
1842 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1845 * Construct an ir_swizzle from the textual representation. Can fail.
1847 static ir_swizzle
*create(ir_rvalue
*, const char *, unsigned vector_length
);
1849 virtual void accept(ir_visitor
*v
)
1854 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1856 virtual bool equals(ir_instruction
*ir
, enum ir_node_type ignore
= ir_type_unset
);
1858 bool is_lvalue() const
1860 return val
->is_lvalue() && !mask
.has_duplicates
;
1864 * Get the variable that is ultimately referenced by an r-value
1866 virtual ir_variable
*variable_referenced() const;
1869 ir_swizzle_mask mask
;
1873 * Initialize the mask component of a swizzle
1875 * This is used by the \c ir_swizzle constructors.
1877 void init_mask(const unsigned *components
, unsigned count
);
1881 class ir_dereference
: public ir_rvalue
{
1883 virtual ir_dereference
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
1885 bool is_lvalue() const;
1888 * Get the variable that is ultimately referenced by an r-value
1890 virtual ir_variable
*variable_referenced() const = 0;
1893 ir_dereference(enum ir_node_type t
)
1900 class ir_dereference_variable
: public ir_dereference
{
1902 ir_dereference_variable(ir_variable
*var
);
1904 virtual ir_dereference_variable
*clone(void *mem_ctx
,
1905 struct hash_table
*) const;
1907 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1909 virtual bool equals(ir_instruction
*ir
, enum ir_node_type ignore
= ir_type_unset
);
1912 * Get the variable that is ultimately referenced by an r-value
1914 virtual ir_variable
*variable_referenced() const
1919 virtual ir_variable
*whole_variable_referenced()
1921 /* ir_dereference_variable objects always dereference the entire
1922 * variable. However, if this dereference is dereferenced by anything
1923 * else, the complete deferefernce chain is not a whole-variable
1924 * dereference. This method should only be called on the top most
1925 * ir_rvalue in a dereference chain.
1930 virtual void accept(ir_visitor
*v
)
1935 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1938 * Object being dereferenced.
1944 class ir_dereference_array
: public ir_dereference
{
1946 ir_dereference_array(ir_rvalue
*value
, ir_rvalue
*array_index
);
1948 ir_dereference_array(ir_variable
*var
, ir_rvalue
*array_index
);
1950 virtual ir_dereference_array
*clone(void *mem_ctx
,
1951 struct hash_table
*) const;
1953 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1955 virtual bool equals(ir_instruction
*ir
, enum ir_node_type ignore
= ir_type_unset
);
1958 * Get the variable that is ultimately referenced by an r-value
1960 virtual ir_variable
*variable_referenced() const
1962 return this->array
->variable_referenced();
1965 virtual void accept(ir_visitor
*v
)
1970 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1973 ir_rvalue
*array_index
;
1976 void set_array(ir_rvalue
*value
);
1980 class ir_dereference_record
: public ir_dereference
{
1982 ir_dereference_record(ir_rvalue
*value
, const char *field
);
1984 ir_dereference_record(ir_variable
*var
, const char *field
);
1986 virtual ir_dereference_record
*clone(void *mem_ctx
,
1987 struct hash_table
*) const;
1989 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1992 * Get the variable that is ultimately referenced by an r-value
1994 virtual ir_variable
*variable_referenced() const
1996 return this->record
->variable_referenced();
1999 virtual void accept(ir_visitor
*v
)
2004 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2012 * Data stored in an ir_constant
2014 union ir_constant_data
{
2022 class ir_constant
: public ir_rvalue
{
2024 ir_constant(const struct glsl_type
*type
, const ir_constant_data
*data
);
2025 ir_constant(bool b
, unsigned vector_elements
=1);
2026 ir_constant(unsigned int u
, unsigned vector_elements
=1);
2027 ir_constant(int i
, unsigned vector_elements
=1);
2028 ir_constant(float f
, unsigned vector_elements
=1);
2031 * Construct an ir_constant from a list of ir_constant values
2033 ir_constant(const struct glsl_type
*type
, exec_list
*values
);
2036 * Construct an ir_constant from a scalar component of another ir_constant
2038 * The new \c ir_constant inherits the type of the component from the
2042 * In the case of a matrix constant, the new constant is a scalar, \b not
2045 ir_constant(const ir_constant
*c
, unsigned i
);
2048 * Return a new ir_constant of the specified type containing all zeros.
2050 static ir_constant
*zero(void *mem_ctx
, const glsl_type
*type
);
2052 virtual ir_constant
*clone(void *mem_ctx
, struct hash_table
*) const;
2054 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
2056 virtual void accept(ir_visitor
*v
)
2061 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2063 virtual bool equals(ir_instruction
*ir
, enum ir_node_type ignore
= ir_type_unset
);
2066 * Get a particular component of a constant as a specific type
2068 * This is useful, for example, to get a value from an integer constant
2069 * as a float or bool. This appears frequently when constructors are
2070 * called with all constant parameters.
2073 bool get_bool_component(unsigned i
) const;
2074 float get_float_component(unsigned i
) const;
2075 int get_int_component(unsigned i
) const;
2076 unsigned get_uint_component(unsigned i
) const;
2079 ir_constant
*get_array_element(unsigned i
) const;
2081 ir_constant
*get_record_field(const char *name
);
2084 * Copy the values on another constant at a given offset.
2086 * The offset is ignored for array or struct copies, it's only for
2087 * scalars or vectors into vectors or matrices.
2089 * With identical types on both sides and zero offset it's clone()
2090 * without creating a new object.
2093 void copy_offset(ir_constant
*src
, int offset
);
2096 * Copy the values on another constant at a given offset and
2097 * following an assign-like mask.
2099 * The mask is ignored for scalars.
2101 * Note that this function only handles what assign can handle,
2102 * i.e. at most a vector as source and a column of a matrix as
2106 void copy_masked_offset(ir_constant
*src
, int offset
, unsigned int mask
);
2109 * Determine whether a constant has the same value as another constant
2111 * \sa ir_constant::is_zero, ir_constant::is_one,
2112 * ir_constant::is_negative_one, ir_constant::is_basis
2114 bool has_value(const ir_constant
*) const;
2117 * Return true if this ir_constant represents the given value.
2119 * For vectors, this checks that each component is the given value.
2121 virtual bool is_value(float f
, int i
) const;
2122 virtual bool is_zero() const;
2123 virtual bool is_one() const;
2124 virtual bool is_negative_one() const;
2125 virtual bool is_basis() const;
2128 * Return true for constants that could be stored as 16-bit unsigned values.
2130 * Note that this will return true even for signed integer ir_constants, as
2131 * long as the value is non-negative and fits in 16-bits.
2133 virtual bool is_uint16_constant() const;
2136 * Value of the constant.
2138 * The field used to back the values supplied by the constant is determined
2139 * by the type associated with the \c ir_instruction. Constants may be
2140 * scalars, vectors, or matrices.
2142 union ir_constant_data value
;
2144 /* Array elements */
2145 ir_constant
**array_elements
;
2147 /* Structure fields */
2148 exec_list components
;
2152 * Parameterless constructor only used by the clone method
2158 * IR instruction to emit a vertex in a geometry shader.
2160 class ir_emit_vertex
: public ir_instruction
{
2163 : ir_instruction(ir_type_emit_vertex
)
2167 virtual void accept(ir_visitor
*v
)
2172 virtual ir_emit_vertex
*clone(void *mem_ctx
, struct hash_table
*) const
2174 return new(mem_ctx
) ir_emit_vertex();
2177 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2181 * IR instruction to complete the current primitive and start a new one in a
2184 class ir_end_primitive
: public ir_instruction
{
2187 : ir_instruction(ir_type_end_primitive
)
2191 virtual void accept(ir_visitor
*v
)
2196 virtual ir_end_primitive
*clone(void *mem_ctx
, struct hash_table
*) const
2198 return new(mem_ctx
) ir_end_primitive();
2201 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2207 * Apply a visitor to each IR node in a list
2210 visit_exec_list(exec_list
*list
, ir_visitor
*visitor
);
2213 * Validate invariants on each IR node in a list
2215 void validate_ir_tree(exec_list
*instructions
);
2217 struct _mesa_glsl_parse_state
;
2218 struct gl_shader_program
;
2221 * Detect whether an unlinked shader contains static recursion
2223 * If the list of instructions is determined to contain static recursion,
2224 * \c _mesa_glsl_error will be called to emit error messages for each function
2225 * that is in the recursion cycle.
2228 detect_recursion_unlinked(struct _mesa_glsl_parse_state
*state
,
2229 exec_list
*instructions
);
2232 * Detect whether a linked shader contains static recursion
2234 * If the list of instructions is determined to contain static recursion,
2235 * \c link_error_printf will be called to emit error messages for each function
2236 * that is in the recursion cycle. In addition,
2237 * \c gl_shader_program::LinkStatus will be set to false.
2240 detect_recursion_linked(struct gl_shader_program
*prog
,
2241 exec_list
*instructions
);
2244 * Make a clone of each IR instruction in a list
2246 * \param in List of IR instructions that are to be cloned
2247 * \param out List to hold the cloned instructions
2250 clone_ir_list(void *mem_ctx
, exec_list
*out
, const exec_list
*in
);
2253 _mesa_glsl_initialize_variables(exec_list
*instructions
,
2254 struct _mesa_glsl_parse_state
*state
);
2257 _mesa_glsl_initialize_functions(_mesa_glsl_parse_state
*state
);
2260 _mesa_glsl_initialize_builtin_functions();
2262 extern ir_function_signature
*
2263 _mesa_glsl_find_builtin_function(_mesa_glsl_parse_state
*state
,
2264 const char *name
, exec_list
*actual_parameters
);
2267 _mesa_glsl_get_builtin_function_shader(void);
2270 _mesa_glsl_release_functions(void);
2273 _mesa_glsl_release_builtin_functions(void);
2276 reparent_ir(exec_list
*list
, void *mem_ctx
);
2278 struct glsl_symbol_table
;
2281 import_prototypes(const exec_list
*source
, exec_list
*dest
,
2282 struct glsl_symbol_table
*symbols
, void *mem_ctx
);
2285 ir_has_call(ir_instruction
*ir
);
2288 do_set_program_inouts(exec_list
*instructions
, struct gl_program
*prog
,
2289 gl_shader_stage shader_stage
);
2292 prototype_string(const glsl_type
*return_type
, const char *name
,
2293 exec_list
*parameters
);
2296 mode_string(const ir_variable
*var
);
2299 * Built-in / reserved GL variables names start with "gl_"
2302 is_gl_identifier(const char *s
)
2304 return s
&& s
[0] == 'g' && s
[1] == 'l' && s
[2] == '_';
2308 #endif /* __cplusplus */
2310 extern void _mesa_print_ir(FILE *f
, struct exec_list
*instructions
,
2311 struct _mesa_glsl_parse_state
*state
);
2314 fprint_ir(FILE *f
, const void *instruction
);
2321 vertices_per_prim(GLenum prim
);