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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 */
90 * Base class of all IR instructions
92 class ir_instruction
: public exec_node
{
94 enum ir_node_type ir_type
;
97 * GCC 4.7+ and clang warn when deleting an ir_instruction unless
98 * there's a virtual destructor present. Because we almost
99 * universally use ralloc for our memory management of
100 * ir_instructions, the destructor doesn't need to do any work.
102 virtual ~ir_instruction()
106 /** ir_print_visitor helper for debugging. */
107 void print(void) const;
109 virtual void accept(ir_visitor
*) = 0;
110 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*) = 0;
111 virtual ir_instruction
*clone(void *mem_ctx
,
112 struct hash_table
*ht
) const = 0;
115 * \name IR instruction downcast functions
117 * These functions either cast the object to a derived class or return
118 * \c NULL if the object's type does not match the specified derived class.
119 * Additional downcast functions will be added as needed.
122 virtual class ir_variable
* as_variable() { return NULL
; }
123 virtual class ir_function
* as_function() { return NULL
; }
124 virtual class ir_dereference
* as_dereference() { return NULL
; }
125 virtual class ir_dereference_array
* as_dereference_array() { return NULL
; }
126 virtual class ir_dereference_variable
*as_dereference_variable() { return NULL
; }
127 virtual class ir_dereference_record
*as_dereference_record() { return NULL
; }
128 virtual class ir_expression
* as_expression() { return NULL
; }
129 virtual class ir_rvalue
* as_rvalue() { return NULL
; }
130 virtual class ir_loop
* as_loop() { return NULL
; }
131 virtual class ir_assignment
* as_assignment() { return NULL
; }
132 virtual class ir_call
* as_call() { return NULL
; }
133 virtual class ir_return
* as_return() { return NULL
; }
134 virtual class ir_if
* as_if() { return NULL
; }
135 virtual class ir_swizzle
* as_swizzle() { return NULL
; }
136 virtual class ir_constant
* as_constant() { return NULL
; }
137 virtual class ir_discard
* as_discard() { return NULL
; }
138 virtual class ir_jump
* as_jump() { return NULL
; }
144 ir_type
= ir_type_unset
;
150 * The base class for all "values"/expression trees.
152 class ir_rvalue
: public ir_instruction
{
154 const struct glsl_type
*type
;
156 virtual ir_rvalue
*clone(void *mem_ctx
, struct hash_table
*) const;
158 virtual void accept(ir_visitor
*v
)
163 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
165 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
167 virtual ir_rvalue
* as_rvalue()
172 ir_rvalue
*as_rvalue_to_saturate();
174 virtual bool is_lvalue() const
180 * Get the variable that is ultimately referenced by an r-value
182 virtual ir_variable
*variable_referenced() const
189 * If an r-value is a reference to a whole variable, get that variable
192 * Pointer to a variable that is completely dereferenced by the r-value. If
193 * the r-value is not a dereference or the dereference does not access the
194 * entire variable (i.e., it's just one array element, struct field), \c NULL
197 virtual ir_variable
*whole_variable_referenced()
203 * Determine if an r-value has the value zero
205 * The base implementation of this function always returns \c false. The
206 * \c ir_constant class over-rides this function to return \c true \b only
207 * for vector and scalar types that have all elements set to the value
208 * zero (or \c false for booleans).
210 * \sa ir_constant::has_value, ir_rvalue::is_one, ir_rvalue::is_negative_one,
211 * ir_constant::is_basis
213 virtual bool is_zero() const;
216 * Determine if an r-value has the value one
218 * The base implementation of this function always returns \c false. The
219 * \c ir_constant class over-rides this function to return \c true \b only
220 * for vector and scalar types that have all elements set to the value
221 * one (or \c true for booleans).
223 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_negative_one,
224 * ir_constant::is_basis
226 virtual bool is_one() const;
229 * Determine if an r-value has the value negative one
231 * The base implementation of this function always returns \c false. The
232 * \c ir_constant class over-rides this function to return \c true \b only
233 * for vector and scalar types that have all elements set to the value
234 * negative one. For boolean types, the result is always \c false.
236 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one
237 * ir_constant::is_basis
239 virtual bool is_negative_one() const;
242 * Determine if an r-value is a basis vector
244 * The base implementation of this function always returns \c false. The
245 * \c ir_constant class over-rides this function to return \c true \b only
246 * for vector and scalar types that have one element set to the value one,
247 * and the other elements set to the value zero. For boolean types, the
248 * result is always \c false.
250 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one,
251 * is_constant::is_negative_one
253 virtual bool is_basis() const;
257 * Return a generic value of error_type.
259 * Allocation will be performed with 'mem_ctx' as ralloc owner.
261 static ir_rvalue
*error_value(void *mem_ctx
);
269 * Variable storage classes
271 enum ir_variable_mode
{
272 ir_var_auto
= 0, /**< Function local variables and globals. */
273 ir_var_uniform
, /**< Variable declared as a uniform. */
278 ir_var_function_inout
,
279 ir_var_const_in
, /**< "in" param that must be a constant expression */
280 ir_var_system_value
, /**< Ex: front-face, instance-id, etc. */
281 ir_var_temporary
, /**< Temporary variable generated during compilation. */
282 ir_var_mode_count
/**< Number of variable modes */
286 * \brief Layout qualifiers for gl_FragDepth.
288 * The AMD/ARB_conservative_depth extensions allow gl_FragDepth to be redeclared
289 * with a layout qualifier.
291 enum ir_depth_layout
{
292 ir_depth_layout_none
, /**< No depth layout is specified. */
294 ir_depth_layout_greater
,
295 ir_depth_layout_less
,
296 ir_depth_layout_unchanged
300 * \brief Convert depth layout qualifier to string.
303 depth_layout_string(ir_depth_layout layout
);
306 * Description of built-in state associated with a uniform
308 * \sa ir_variable::state_slots
310 struct ir_state_slot
{
315 class ir_variable
: public ir_instruction
{
317 ir_variable(const struct glsl_type
*, const char *, ir_variable_mode
);
319 virtual ir_variable
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
321 virtual ir_variable
*as_variable()
326 virtual void accept(ir_visitor
*v
)
331 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
335 * Get the string value for the interpolation qualifier
337 * \return The string that would be used in a shader to specify \c
338 * mode will be returned.
340 * This function is used to generate error messages of the form "shader
341 * uses %s interpolation qualifier", so in the case where there is no
342 * interpolation qualifier, it returns "no".
344 * This function should only be used on a shader input or output variable.
346 const char *interpolation_string() const;
349 * Determine how this variable should be interpolated based on its
350 * interpolation qualifier (if present), whether it is gl_Color or
351 * gl_SecondaryColor, and whether flatshading is enabled in the current GL
354 * The return value will always be either INTERP_QUALIFIER_SMOOTH,
355 * INTERP_QUALIFIER_NOPERSPECTIVE, or INTERP_QUALIFIER_FLAT.
357 glsl_interp_qualifier
determine_interpolation_mode(bool flat_shade
);
360 * Determine whether or not a variable is part of a uniform block.
362 inline bool is_in_uniform_block() const
364 return this->mode
== ir_var_uniform
&& this->interface_type
!= NULL
;
368 * Determine whether or not a variable is the declaration of an interface
371 * For the first declaration below, there will be an \c ir_variable named
372 * "instance" whose type and whose instance_type will be the same
373 * \cglsl_type. For the second declaration, there will be an \c ir_variable
374 * named "f" whose type is float and whose instance_type is B2.
376 * "instance" is an interface instance variable, but "f" is not.
386 inline bool is_interface_instance() const
388 const glsl_type
*const t
= this->type
;
390 return (t
== this->interface_type
)
391 || (t
->is_array() && t
->fields
.array
== this->interface_type
);
395 * Declared type of the variable
397 const struct glsl_type
*type
;
400 * Declared name of the variable
405 * Highest element accessed with a constant expression array index
407 * Not used for non-array variables.
409 unsigned max_array_access
;
412 * Is the variable read-only?
414 * This is set for variables declared as \c const, shader inputs,
417 unsigned read_only
:1;
419 unsigned invariant
:1;
422 * Has this variable been used for reading or writing?
424 * Several GLSL semantic checks require knowledge of whether or not a
425 * variable has been used. For example, it is an error to redeclare a
426 * variable as invariant after it has been used.
428 * This is only maintained in the ast_to_hir.cpp path, not in
429 * Mesa's fixed function or ARB program paths.
434 * Has this variable been statically assigned?
436 * This answers whether the variable was assigned in any path of
437 * the shader during ast_to_hir. This doesn't answer whether it is
438 * still written after dead code removal, nor is it maintained in
439 * non-ast_to_hir.cpp (GLSL parsing) paths.
444 * Storage class of the variable.
446 * \sa ir_variable_mode
451 * Interpolation mode for shader inputs / outputs
453 * \sa ir_variable_interpolation
455 unsigned interpolation
:2;
458 * \name ARB_fragment_coord_conventions
461 unsigned origin_upper_left
:1;
462 unsigned pixel_center_integer
:1;
466 * Was the location explicitly set in the shader?
468 * If the location is explicitly set in the shader, it \b cannot be changed
469 * by the linker or by the API (e.g., calls to \c glBindAttribLocation have
472 unsigned explicit_location
:1;
473 unsigned explicit_index
:1;
476 * Was an initial binding explicitly set in the shader?
478 * If so, constant_value contains an integer ir_constant representing the
479 * initial binding point.
481 unsigned explicit_binding
:1;
484 * Does this variable have an initializer?
486 * This is used by the linker to cross-validiate initializers of global
489 unsigned has_initializer
:1;
492 * Is this variable a generic output or input that has not yet been matched
493 * up to a variable in another stage of the pipeline?
495 * This is used by the linker as scratch storage while assigning locations
496 * to generic inputs and outputs.
498 unsigned is_unmatched_generic_inout
:1;
501 * If non-zero, then this variable may be packed along with other variables
502 * into a single varying slot, so this offset should be applied when
503 * accessing components. For example, an offset of 1 means that the x
504 * component of this variable is actually stored in component y of the
505 * location specified by \c location.
507 unsigned location_frac
:2;
510 * \brief Layout qualifier for gl_FragDepth.
512 * This is not equal to \c ir_depth_layout_none if and only if this
513 * variable is \c gl_FragDepth and a layout qualifier is specified.
515 ir_depth_layout depth_layout
;
518 * Storage location of the base of this variable
520 * The precise meaning of this field depends on the nature of the variable.
522 * - Vertex shader input: one of the values from \c gl_vert_attrib.
523 * - Vertex shader output: one of the values from \c gl_varying_slot.
524 * - Geometry shader input: one of the values from \c gl_varying_slot.
525 * - Geometry shader output: one of the values from \c gl_varying_slot.
526 * - Fragment shader input: one of the values from \c gl_varying_slot.
527 * - Fragment shader output: one of the values from \c gl_frag_result.
528 * - Uniforms: Per-stage uniform slot number for default uniform block.
529 * - Uniforms: Index within the uniform block definition for UBO members.
530 * - Other: This field is not currently used.
532 * If the variable is a uniform, shader input, or shader output, and the
533 * slot has not been assigned, the value will be -1.
538 * output index for dual source blending.
543 * Initial binding point for a sampler or UBO.
545 * For array types, this represents the binding point for the first element.
550 * Built-in state that backs this uniform
552 * Once set at variable creation, \c state_slots must remain invariant.
553 * This is because, ideally, this array would be shared by all clones of
554 * this variable in the IR tree. In other words, we'd really like for it
555 * to be a fly-weight.
557 * If the variable is not a uniform, \c num_state_slots will be zero and
558 * \c state_slots will be \c NULL.
561 unsigned num_state_slots
; /**< Number of state slots used */
562 ir_state_slot
*state_slots
; /**< State descriptors. */
566 * Emit a warning if this variable is accessed.
568 const char *warn_extension
;
571 * Value assigned in the initializer of a variable declared "const"
573 ir_constant
*constant_value
;
576 * Constant expression assigned in the initializer of the variable
579 * This field and \c ::constant_value are distinct. Even if the two fields
580 * refer to constants with the same value, they must point to separate
583 ir_constant
*constant_initializer
;
586 * For variables that are in an interface block or are an instance of an
587 * interface block, this is the \c GLSL_TYPE_INTERFACE type for that block.
589 * \sa ir_variable::location
591 const glsl_type
*interface_type
;
597 * The representation of a function instance; may be the full definition or
598 * simply a prototype.
600 class ir_function_signature
: public ir_instruction
{
601 /* An ir_function_signature will be part of the list of signatures in
605 ir_function_signature(const glsl_type
*return_type
);
607 virtual ir_function_signature
*clone(void *mem_ctx
,
608 struct hash_table
*ht
) const;
609 ir_function_signature
*clone_prototype(void *mem_ctx
,
610 struct hash_table
*ht
) const;
612 virtual void accept(ir_visitor
*v
)
617 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
620 * Attempt to evaluate this function as a constant expression,
621 * given a list of the actual parameters and the variable context.
622 * Returns NULL for non-built-ins.
624 ir_constant
*constant_expression_value(exec_list
*actual_parameters
, struct hash_table
*variable_context
);
627 * Get the name of the function for which this is a signature
629 const char *function_name() const;
632 * Get a handle to the function for which this is a signature
634 * There is no setter function, this function returns a \c const pointer,
635 * and \c ir_function_signature::_function is private for a reason. The
636 * only way to make a connection between a function and function signature
637 * is via \c ir_function::add_signature. This helps ensure that certain
638 * invariants (i.e., a function signature is in the list of signatures for
639 * its \c _function) are met.
641 * \sa ir_function::add_signature
643 inline const class ir_function
*function() const
645 return this->_function
;
649 * Check whether the qualifiers match between this signature's parameters
650 * and the supplied parameter list. If not, returns the name of the first
651 * parameter with mismatched qualifiers (for use in error messages).
653 const char *qualifiers_match(exec_list
*params
);
656 * Replace the current parameter list with the given one. This is useful
657 * if the current information came from a prototype, and either has invalid
658 * or missing parameter names.
660 void replace_parameters(exec_list
*new_params
);
663 * Function return type.
665 * \note This discards the optional precision qualifier.
667 const struct glsl_type
*return_type
;
670 * List of ir_variable of function parameters.
672 * This represents the storage. The paramaters passed in a particular
673 * call will be in ir_call::actual_paramaters.
675 struct exec_list parameters
;
677 /** Whether or not this function has a body (which may be empty). */
678 unsigned is_defined
:1;
680 /** Whether or not this function signature is a built-in. */
681 unsigned is_builtin
:1;
683 /** Body of instructions in the function. */
684 struct exec_list body
;
687 /** Function of which this signature is one overload. */
688 class ir_function
*_function
;
690 /** Function signature of which this one is a prototype clone */
691 const ir_function_signature
*origin
;
693 friend class ir_function
;
696 * Helper function to run a list of instructions for constant
697 * expression evaluation.
699 * The hash table represents the values of the visible variables.
700 * There are no scoping issues because the table is indexed on
701 * ir_variable pointers, not variable names.
703 * Returns false if the expression is not constant, true otherwise,
704 * and the value in *result if result is non-NULL.
706 bool constant_expression_evaluate_expression_list(const struct exec_list
&body
,
707 struct hash_table
*variable_context
,
708 ir_constant
**result
);
713 * Header for tracking multiple overloaded functions with the same name.
714 * Contains a list of ir_function_signatures representing each of the
717 class ir_function
: public ir_instruction
{
719 ir_function(const char *name
);
721 virtual ir_function
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
723 virtual ir_function
*as_function()
728 virtual void accept(ir_visitor
*v
)
733 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
735 void add_signature(ir_function_signature
*sig
)
737 sig
->_function
= this;
738 this->signatures
.push_tail(sig
);
742 * Get an iterator for the set of function signatures
744 exec_list_iterator
iterator()
746 return signatures
.iterator();
750 * Find a signature that matches a set of actual parameters, taking implicit
751 * conversions into account. Also flags whether the match was exact.
753 ir_function_signature
*matching_signature(const exec_list
*actual_param
,
754 bool *match_is_exact
);
757 * Find a signature that matches a set of actual parameters, taking implicit
758 * conversions into account.
760 ir_function_signature
*matching_signature(const exec_list
*actual_param
);
763 * Find a signature that exactly matches a set of actual parameters without
764 * any implicit type conversions.
766 ir_function_signature
*exact_matching_signature(const exec_list
*actual_ps
);
769 * Name of the function.
773 /** Whether or not this function has a signature that isn't a built-in. */
774 bool has_user_signature();
777 * List of ir_function_signature for each overloaded function with this name.
779 struct exec_list signatures
;
782 inline const char *ir_function_signature::function_name() const
784 return this->_function
->name
;
790 * IR instruction representing high-level if-statements
792 class ir_if
: public ir_instruction
{
794 ir_if(ir_rvalue
*condition
)
795 : condition(condition
)
797 ir_type
= ir_type_if
;
800 virtual ir_if
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
802 virtual ir_if
*as_if()
807 virtual void accept(ir_visitor
*v
)
812 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
814 ir_rvalue
*condition
;
815 /** List of ir_instruction for the body of the then branch */
816 exec_list then_instructions
;
817 /** List of ir_instruction for the body of the else branch */
818 exec_list else_instructions
;
823 * IR instruction representing a high-level loop structure.
825 class ir_loop
: public ir_instruction
{
829 virtual ir_loop
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
831 virtual void accept(ir_visitor
*v
)
836 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
838 virtual ir_loop
*as_loop()
844 * Get an iterator for the instructions of the loop body
846 exec_list_iterator
iterator()
848 return body_instructions
.iterator();
851 /** List of ir_instruction that make up the body of the loop. */
852 exec_list body_instructions
;
855 * \name Loop counter and controls
857 * Represents a loop like a FORTRAN \c do-loop.
860 * If \c from and \c to are the same value, the loop will execute once.
863 ir_rvalue
*from
; /** Value of the loop counter on the first
864 * iteration of the loop.
866 ir_rvalue
*to
; /** Value of the loop counter on the last
867 * iteration of the loop.
869 ir_rvalue
*increment
;
870 ir_variable
*counter
;
873 * Comparison operation in the loop terminator.
875 * If any of the loop control fields are non-\c NULL, this field must be
876 * one of \c ir_binop_less, \c ir_binop_greater, \c ir_binop_lequal,
877 * \c ir_binop_gequal, \c ir_binop_equal, or \c ir_binop_nequal.
884 class ir_assignment
: public ir_instruction
{
886 ir_assignment(ir_rvalue
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
= NULL
);
889 * Construct an assignment with an explicit write mask
892 * Since a write mask is supplied, the LHS must already be a bare
893 * \c ir_dereference. The cannot be any swizzles in the LHS.
895 ir_assignment(ir_dereference
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
,
896 unsigned write_mask
);
898 virtual ir_assignment
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
900 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
902 virtual void accept(ir_visitor
*v
)
907 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
909 virtual ir_assignment
* as_assignment()
915 * Get a whole variable written by an assignment
917 * If the LHS of the assignment writes a whole variable, the variable is
918 * returned. Otherwise \c NULL is returned. Examples of whole-variable
921 * - Assigning to a scalar
922 * - Assigning to all components of a vector
923 * - Whole array (or matrix) assignment
924 * - Whole structure assignment
926 ir_variable
*whole_variable_written();
929 * Set the LHS of an assignment
931 void set_lhs(ir_rvalue
*lhs
);
934 * Left-hand side of the assignment.
936 * This should be treated as read only. If you need to set the LHS of an
937 * assignment, use \c ir_assignment::set_lhs.
942 * Value being assigned
947 * Optional condition for the assignment.
949 ir_rvalue
*condition
;
953 * Component mask written
955 * For non-vector types in the LHS, this field will be zero. For vector
956 * types, a bit will be set for each component that is written. Note that
957 * for \c vec2 and \c vec3 types only the lower bits will ever be set.
959 * A partially-set write mask means that each enabled channel gets
960 * the value from a consecutive channel of the rhs. For example,
961 * to write just .xyw of gl_FrontColor with color:
963 * (assign (constant bool (1)) (xyw)
964 * (var_ref gl_FragColor)
965 * (swiz xyw (var_ref color)))
967 unsigned write_mask
:4;
970 /* Update ir_expression::get_num_operands() and operator_strs when
971 * updating this list.
973 enum ir_expression_operation
{
982 ir_unop_exp
, /**< Log base e on gentype */
983 ir_unop_log
, /**< Natural log on gentype */
986 ir_unop_f2i
, /**< Float-to-integer conversion. */
987 ir_unop_f2u
, /**< Float-to-unsigned conversion. */
988 ir_unop_i2f
, /**< Integer-to-float conversion. */
989 ir_unop_f2b
, /**< Float-to-boolean conversion */
990 ir_unop_b2f
, /**< Boolean-to-float conversion */
991 ir_unop_i2b
, /**< int-to-boolean conversion */
992 ir_unop_b2i
, /**< Boolean-to-int conversion */
993 ir_unop_u2f
, /**< Unsigned-to-float conversion. */
994 ir_unop_i2u
, /**< Integer-to-unsigned conversion. */
995 ir_unop_u2i
, /**< Unsigned-to-integer conversion. */
996 ir_unop_bitcast_i2f
, /**< Bit-identical int-to-float "conversion" */
997 ir_unop_bitcast_f2i
, /**< Bit-identical float-to-int "conversion" */
998 ir_unop_bitcast_u2f
, /**< Bit-identical uint-to-float "conversion" */
999 ir_unop_bitcast_f2u
, /**< Bit-identical float-to-uint "conversion" */
1003 * \name Unary floating-point rounding operations.
1014 * \name Trigonometric operations.
1019 ir_unop_sin_reduced
, /**< Reduced range sin. [-pi, pi] */
1020 ir_unop_cos_reduced
, /**< Reduced range cos. [-pi, pi] */
1024 * \name Partial derivatives.
1032 * \name Floating point pack and unpack operations.
1035 ir_unop_pack_snorm_2x16
,
1036 ir_unop_pack_snorm_4x8
,
1037 ir_unop_pack_unorm_2x16
,
1038 ir_unop_pack_unorm_4x8
,
1039 ir_unop_pack_half_2x16
,
1040 ir_unop_unpack_snorm_2x16
,
1041 ir_unop_unpack_snorm_4x8
,
1042 ir_unop_unpack_unorm_2x16
,
1043 ir_unop_unpack_unorm_4x8
,
1044 ir_unop_unpack_half_2x16
,
1048 * \name Lowered floating point unpacking operations.
1050 * \see lower_packing_builtins_visitor::split_unpack_half_2x16
1053 ir_unop_unpack_half_2x16_split_x
,
1054 ir_unop_unpack_half_2x16_split_y
,
1058 * \name Bit operations, part of ARB_gpu_shader5.
1061 ir_unop_bitfield_reverse
,
1070 * A sentinel marking the last of the unary operations.
1072 ir_last_unop
= ir_unop_noise
,
1080 * Takes one of two combinations of arguments:
1083 * - mod(vecN, float)
1085 * Does not take integer types.
1090 * \name Binary comparison operators which return a boolean vector.
1091 * The type of both operands must be equal.
1101 * Returns single boolean for whether all components of operands[0]
1102 * equal the components of operands[1].
1106 * Returns single boolean for whether any component of operands[0]
1107 * is not equal to the corresponding component of operands[1].
1109 ir_binop_any_nequal
,
1113 * \name Bit-wise binary operations.
1134 * \name Lowered floating point packing operations.
1136 * \see lower_packing_builtins_visitor::split_pack_half_2x16
1139 ir_binop_pack_half_2x16_split
,
1143 * \name First half of a lowered bitfieldInsert() operation.
1145 * \see lower_instructions::bitfield_insert_to_bfm_bfi
1152 * Load a value the size of a given GLSL type from a uniform block.
1154 * operand0 is the ir_constant uniform block index in the linked shader.
1155 * operand1 is a byte offset within the uniform block.
1160 * Extract a scalar from a vector
1162 * operand0 is the vector
1163 * operand1 is the index of the field to read from operand0
1165 ir_binop_vector_extract
,
1168 * A sentinel marking the last of the binary operations.
1170 ir_last_binop
= ir_binop_vector_extract
,
1173 * \name Fused floating-point multiply-add, part of ARB_gpu_shader5.
1182 * \name Second half of a lowered bitfieldInsert() operation.
1184 * \see lower_instructions::bitfield_insert_to_bfm_bfi
1190 ir_triop_bitfield_extract
,
1193 * Generate a value with one field of a vector changed
1195 * operand0 is the vector
1196 * operand1 is the value to write into the vector result
1197 * operand2 is the index in operand0 to be modified
1199 ir_triop_vector_insert
,
1202 * A sentinel marking the last of the ternary operations.
1204 ir_last_triop
= ir_triop_vector_insert
,
1206 ir_quadop_bitfield_insert
,
1211 * A sentinel marking the last of the ternary operations.
1213 ir_last_quadop
= ir_quadop_vector
,
1216 * A sentinel marking the last of all operations.
1218 ir_last_opcode
= ir_quadop_vector
1221 class ir_expression
: public ir_rvalue
{
1223 ir_expression(int op
, const struct glsl_type
*type
,
1224 ir_rvalue
*op0
, ir_rvalue
*op1
= NULL
,
1225 ir_rvalue
*op2
= NULL
, ir_rvalue
*op3
= NULL
);
1228 * Constructor for unary operation expressions
1230 ir_expression(int op
, ir_rvalue
*);
1233 * Constructor for binary operation expressions
1235 ir_expression(int op
, ir_rvalue
*op0
, ir_rvalue
*op1
);
1237 virtual ir_expression
*as_expression()
1242 virtual ir_expression
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1245 * Attempt to constant-fold the expression
1247 * The "variable_context" hash table links ir_variable * to ir_constant *
1248 * that represent the variables' values. \c NULL represents an empty
1251 * If the expression cannot be constant folded, this method will return
1254 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1257 * Determine the number of operands used by an expression
1259 static unsigned int get_num_operands(ir_expression_operation
);
1262 * Determine the number of operands used by an expression
1264 unsigned int get_num_operands() const
1266 return (this->operation
== ir_quadop_vector
)
1267 ? this->type
->vector_elements
: get_num_operands(operation
);
1271 * Return a string representing this expression's operator.
1273 const char *operator_string();
1276 * Return a string representing this expression's operator.
1278 static const char *operator_string(ir_expression_operation
);
1282 * Do a reverse-lookup to translate the given string into an operator.
1284 static ir_expression_operation
get_operator(const char *);
1286 virtual void accept(ir_visitor
*v
)
1291 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1293 ir_expression_operation operation
;
1294 ir_rvalue
*operands
[4];
1299 * HIR instruction representing a high-level function call, containing a list
1300 * of parameters and returning a value in the supplied temporary.
1302 class ir_call
: public ir_instruction
{
1304 ir_call(ir_function_signature
*callee
,
1305 ir_dereference_variable
*return_deref
,
1306 exec_list
*actual_parameters
)
1307 : return_deref(return_deref
), callee(callee
)
1309 ir_type
= ir_type_call
;
1310 assert(callee
->return_type
!= NULL
);
1311 actual_parameters
->move_nodes_to(& this->actual_parameters
);
1312 this->use_builtin
= callee
->is_builtin
;
1315 virtual ir_call
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1317 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1319 virtual ir_call
*as_call()
1324 virtual void accept(ir_visitor
*v
)
1329 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1332 * Get an iterator for the set of acutal parameters
1334 exec_list_iterator
iterator()
1336 return actual_parameters
.iterator();
1340 * Get the name of the function being called.
1342 const char *callee_name() const
1344 return callee
->function_name();
1348 * Generates an inline version of the function before @ir,
1349 * storing the return value in return_deref.
1351 void generate_inline(ir_instruction
*ir
);
1354 * Storage for the function's return value.
1355 * This must be NULL if the return type is void.
1357 ir_dereference_variable
*return_deref
;
1360 * The specific function signature being called.
1362 ir_function_signature
*callee
;
1364 /* List of ir_rvalue of paramaters passed in this call. */
1365 exec_list actual_parameters
;
1367 /** Should this call only bind to a built-in function? */
1373 * \name Jump-like IR instructions.
1375 * These include \c break, \c continue, \c return, and \c discard.
1378 class ir_jump
: public ir_instruction
{
1382 ir_type
= ir_type_unset
;
1386 virtual ir_jump
*as_jump()
1392 class ir_return
: public ir_jump
{
1397 this->ir_type
= ir_type_return
;
1400 ir_return(ir_rvalue
*value
)
1403 this->ir_type
= ir_type_return
;
1406 virtual ir_return
*clone(void *mem_ctx
, struct hash_table
*) const;
1408 virtual ir_return
*as_return()
1413 ir_rvalue
*get_value() const
1418 virtual void accept(ir_visitor
*v
)
1423 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1430 * Jump instructions used inside loops
1432 * These include \c break and \c continue. The \c break within a loop is
1433 * different from the \c break within a switch-statement.
1435 * \sa ir_switch_jump
1437 class ir_loop_jump
: public ir_jump
{
1444 ir_loop_jump(jump_mode mode
)
1446 this->ir_type
= ir_type_loop_jump
;
1450 virtual ir_loop_jump
*clone(void *mem_ctx
, struct hash_table
*) const;
1452 virtual void accept(ir_visitor
*v
)
1457 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1459 bool is_break() const
1461 return mode
== jump_break
;
1464 bool is_continue() const
1466 return mode
== jump_continue
;
1469 /** Mode selector for the jump instruction. */
1470 enum jump_mode mode
;
1474 * IR instruction representing discard statements.
1476 class ir_discard
: public ir_jump
{
1480 this->ir_type
= ir_type_discard
;
1481 this->condition
= NULL
;
1484 ir_discard(ir_rvalue
*cond
)
1486 this->ir_type
= ir_type_discard
;
1487 this->condition
= cond
;
1490 virtual ir_discard
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1492 virtual void accept(ir_visitor
*v
)
1497 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1499 virtual ir_discard
*as_discard()
1504 ir_rvalue
*condition
;
1510 * Texture sampling opcodes used in ir_texture
1512 enum ir_texture_opcode
{
1513 ir_tex
, /**< Regular texture look-up */
1514 ir_txb
, /**< Texture look-up with LOD bias */
1515 ir_txl
, /**< Texture look-up with explicit LOD */
1516 ir_txd
, /**< Texture look-up with partial derivatvies */
1517 ir_txf
, /**< Texel fetch with explicit LOD */
1518 ir_txf_ms
, /**< Multisample texture fetch */
1519 ir_txs
, /**< Texture size */
1520 ir_lod
/**< Texture lod query */
1525 * IR instruction to sample a texture
1527 * The specific form of the IR instruction depends on the \c mode value
1528 * selected from \c ir_texture_opcodes. In the printed IR, these will
1531 * Texel offset (0 or an expression)
1532 * | Projection divisor
1533 * | | Shadow comparitor
1536 * (tex <type> <sampler> <coordinate> 0 1 ( ))
1537 * (txb <type> <sampler> <coordinate> 0 1 ( ) <bias>)
1538 * (txl <type> <sampler> <coordinate> 0 1 ( ) <lod>)
1539 * (txd <type> <sampler> <coordinate> 0 1 ( ) (dPdx dPdy))
1540 * (txf <type> <sampler> <coordinate> 0 <lod>)
1542 * <type> <sampler> <coordinate> <sample_index>)
1543 * (txs <type> <sampler> <lod>)
1544 * (lod <type> <sampler> <coordinate>)
1546 class ir_texture
: public ir_rvalue
{
1548 ir_texture(enum ir_texture_opcode op
)
1549 : op(op
), sampler(NULL
), coordinate(NULL
), projector(NULL
),
1550 shadow_comparitor(NULL
), offset(NULL
)
1552 this->ir_type
= ir_type_texture
;
1555 virtual ir_texture
*clone(void *mem_ctx
, struct hash_table
*) const;
1557 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1559 virtual void accept(ir_visitor
*v
)
1564 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1567 * Return a string representing the ir_texture_opcode.
1569 const char *opcode_string();
1571 /** Set the sampler and type. */
1572 void set_sampler(ir_dereference
*sampler
, const glsl_type
*type
);
1575 * Do a reverse-lookup to translate a string into an ir_texture_opcode.
1577 static ir_texture_opcode
get_opcode(const char *);
1579 enum ir_texture_opcode op
;
1581 /** Sampler to use for the texture access. */
1582 ir_dereference
*sampler
;
1584 /** Texture coordinate to sample */
1585 ir_rvalue
*coordinate
;
1588 * Value used for projective divide.
1590 * If there is no projective divide (the common case), this will be
1591 * \c NULL. Optimization passes should check for this to point to a constant
1592 * of 1.0 and replace that with \c NULL.
1594 ir_rvalue
*projector
;
1597 * Coordinate used for comparison on shadow look-ups.
1599 * If there is no shadow comparison, this will be \c NULL. For the
1600 * \c ir_txf opcode, this *must* be \c NULL.
1602 ir_rvalue
*shadow_comparitor
;
1604 /** Texel offset. */
1608 ir_rvalue
*lod
; /**< Floating point LOD */
1609 ir_rvalue
*bias
; /**< Floating point LOD bias */
1610 ir_rvalue
*sample_index
; /**< MSAA sample index */
1612 ir_rvalue
*dPdx
; /**< Partial derivative of coordinate wrt X */
1613 ir_rvalue
*dPdy
; /**< Partial derivative of coordinate wrt Y */
1619 struct ir_swizzle_mask
{
1626 * Number of components in the swizzle.
1628 unsigned num_components
:3;
1631 * Does the swizzle contain duplicate components?
1633 * L-value swizzles cannot contain duplicate components.
1635 unsigned has_duplicates
:1;
1639 class ir_swizzle
: public ir_rvalue
{
1641 ir_swizzle(ir_rvalue
*, unsigned x
, unsigned y
, unsigned z
, unsigned w
,
1644 ir_swizzle(ir_rvalue
*val
, const unsigned *components
, unsigned count
);
1646 ir_swizzle(ir_rvalue
*val
, ir_swizzle_mask mask
);
1648 virtual ir_swizzle
*clone(void *mem_ctx
, struct hash_table
*) const;
1650 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1652 virtual ir_swizzle
*as_swizzle()
1658 * Construct an ir_swizzle from the textual representation. Can fail.
1660 static ir_swizzle
*create(ir_rvalue
*, const char *, unsigned vector_length
);
1662 virtual void accept(ir_visitor
*v
)
1667 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1669 bool is_lvalue() const
1671 return val
->is_lvalue() && !mask
.has_duplicates
;
1675 * Get the variable that is ultimately referenced by an r-value
1677 virtual ir_variable
*variable_referenced() const;
1680 ir_swizzle_mask mask
;
1684 * Initialize the mask component of a swizzle
1686 * This is used by the \c ir_swizzle constructors.
1688 void init_mask(const unsigned *components
, unsigned count
);
1692 class ir_dereference
: public ir_rvalue
{
1694 virtual ir_dereference
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
1696 virtual ir_dereference
*as_dereference()
1701 bool is_lvalue() const;
1704 * Get the variable that is ultimately referenced by an r-value
1706 virtual ir_variable
*variable_referenced() const = 0;
1709 * Get the constant that is ultimately referenced by an r-value,
1710 * in a constant expression evaluation context.
1712 * The offset is used when the reference is to a specific column of
1715 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const = 0;
1719 class ir_dereference_variable
: public ir_dereference
{
1721 ir_dereference_variable(ir_variable
*var
);
1723 virtual ir_dereference_variable
*clone(void *mem_ctx
,
1724 struct hash_table
*) const;
1726 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1728 virtual ir_dereference_variable
*as_dereference_variable()
1734 * Get the variable that is ultimately referenced by an r-value
1736 virtual ir_variable
*variable_referenced() const
1742 * Get the constant that is ultimately referenced by an r-value,
1743 * in a constant expression evaluation context.
1745 * The offset is used when the reference is to a specific column of
1748 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const;
1750 virtual ir_variable
*whole_variable_referenced()
1752 /* ir_dereference_variable objects always dereference the entire
1753 * variable. However, if this dereference is dereferenced by anything
1754 * else, the complete deferefernce chain is not a whole-variable
1755 * dereference. This method should only be called on the top most
1756 * ir_rvalue in a dereference chain.
1761 virtual void accept(ir_visitor
*v
)
1766 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1769 * Object being dereferenced.
1775 class ir_dereference_array
: public ir_dereference
{
1777 ir_dereference_array(ir_rvalue
*value
, ir_rvalue
*array_index
);
1779 ir_dereference_array(ir_variable
*var
, ir_rvalue
*array_index
);
1781 virtual ir_dereference_array
*clone(void *mem_ctx
,
1782 struct hash_table
*) const;
1784 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1786 virtual ir_dereference_array
*as_dereference_array()
1792 * Get the variable that is ultimately referenced by an r-value
1794 virtual ir_variable
*variable_referenced() const
1796 return this->array
->variable_referenced();
1800 * Get the constant that is ultimately referenced by an r-value,
1801 * in a constant expression evaluation context.
1803 * The offset is used when the reference is to a specific column of
1806 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const;
1808 virtual void accept(ir_visitor
*v
)
1813 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1816 ir_rvalue
*array_index
;
1819 void set_array(ir_rvalue
*value
);
1823 class ir_dereference_record
: public ir_dereference
{
1825 ir_dereference_record(ir_rvalue
*value
, const char *field
);
1827 ir_dereference_record(ir_variable
*var
, const char *field
);
1829 virtual ir_dereference_record
*clone(void *mem_ctx
,
1830 struct hash_table
*) const;
1832 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1834 virtual ir_dereference_record
*as_dereference_record()
1840 * Get the variable that is ultimately referenced by an r-value
1842 virtual ir_variable
*variable_referenced() const
1844 return this->record
->variable_referenced();
1848 * Get the constant that is ultimately referenced by an r-value,
1849 * in a constant expression evaluation context.
1851 * The offset is used when the reference is to a specific column of
1854 virtual void constant_referenced(struct hash_table
*variable_context
, ir_constant
*&store
, int &offset
) const;
1856 virtual void accept(ir_visitor
*v
)
1861 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1869 * Data stored in an ir_constant
1871 union ir_constant_data
{
1879 class ir_constant
: public ir_rvalue
{
1881 ir_constant(const struct glsl_type
*type
, const ir_constant_data
*data
);
1882 ir_constant(bool b
);
1883 ir_constant(unsigned int u
);
1885 ir_constant(float f
);
1888 * Construct an ir_constant from a list of ir_constant values
1890 ir_constant(const struct glsl_type
*type
, exec_list
*values
);
1893 * Construct an ir_constant from a scalar component of another ir_constant
1895 * The new \c ir_constant inherits the type of the component from the
1899 * In the case of a matrix constant, the new constant is a scalar, \b not
1902 ir_constant(const ir_constant
*c
, unsigned i
);
1905 * Return a new ir_constant of the specified type containing all zeros.
1907 static ir_constant
*zero(void *mem_ctx
, const glsl_type
*type
);
1909 virtual ir_constant
*clone(void *mem_ctx
, struct hash_table
*) const;
1911 virtual ir_constant
*constant_expression_value(struct hash_table
*variable_context
= NULL
);
1913 virtual ir_constant
*as_constant()
1918 virtual void accept(ir_visitor
*v
)
1923 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1926 * Get a particular component of a constant as a specific type
1928 * This is useful, for example, to get a value from an integer constant
1929 * as a float or bool. This appears frequently when constructors are
1930 * called with all constant parameters.
1933 bool get_bool_component(unsigned i
) const;
1934 float get_float_component(unsigned i
) const;
1935 int get_int_component(unsigned i
) const;
1936 unsigned get_uint_component(unsigned i
) const;
1939 ir_constant
*get_array_element(unsigned i
) const;
1941 ir_constant
*get_record_field(const char *name
);
1944 * Copy the values on another constant at a given offset.
1946 * The offset is ignored for array or struct copies, it's only for
1947 * scalars or vectors into vectors or matrices.
1949 * With identical types on both sides and zero offset it's clone()
1950 * without creating a new object.
1953 void copy_offset(ir_constant
*src
, int offset
);
1956 * Copy the values on another constant at a given offset and
1957 * following an assign-like mask.
1959 * The mask is ignored for scalars.
1961 * Note that this function only handles what assign can handle,
1962 * i.e. at most a vector as source and a column of a matrix as
1966 void copy_masked_offset(ir_constant
*src
, int offset
, unsigned int mask
);
1969 * Determine whether a constant has the same value as another constant
1971 * \sa ir_constant::is_zero, ir_constant::is_one,
1972 * ir_constant::is_negative_one, ir_constant::is_basis
1974 bool has_value(const ir_constant
*) const;
1976 virtual bool is_zero() const;
1977 virtual bool is_one() const;
1978 virtual bool is_negative_one() const;
1979 virtual bool is_basis() const;
1982 * Value of the constant.
1984 * The field used to back the values supplied by the constant is determined
1985 * by the type associated with the \c ir_instruction. Constants may be
1986 * scalars, vectors, or matrices.
1988 union ir_constant_data value
;
1990 /* Array elements */
1991 ir_constant
**array_elements
;
1993 /* Structure fields */
1994 exec_list components
;
1998 * Parameterless constructor only used by the clone method
2006 * IR instruction to emit a vertex in a geometry shader.
2008 class ir_emit_vertex
: public ir_instruction
{
2012 ir_type
= ir_type_emit_vertex
;
2015 virtual void accept(ir_visitor
*v
)
2020 virtual ir_emit_vertex
*clone(void *mem_ctx
, struct hash_table
*) const
2022 return new(mem_ctx
) ir_emit_vertex();
2025 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2029 * IR instruction to complete the current primitive and start a new one in a
2032 class ir_end_primitive
: public ir_instruction
{
2036 ir_type
= ir_type_end_primitive
;
2039 virtual void accept(ir_visitor
*v
)
2044 virtual ir_end_primitive
*clone(void *mem_ctx
, struct hash_table
*) const
2046 return new(mem_ctx
) ir_end_primitive();
2049 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
2053 * Apply a visitor to each IR node in a list
2056 visit_exec_list(exec_list
*list
, ir_visitor
*visitor
);
2059 * Validate invariants on each IR node in a list
2061 void validate_ir_tree(exec_list
*instructions
);
2063 struct _mesa_glsl_parse_state
;
2064 struct gl_shader_program
;
2067 * Detect whether an unlinked shader contains static recursion
2069 * If the list of instructions is determined to contain static recursion,
2070 * \c _mesa_glsl_error will be called to emit error messages for each function
2071 * that is in the recursion cycle.
2074 detect_recursion_unlinked(struct _mesa_glsl_parse_state
*state
,
2075 exec_list
*instructions
);
2078 * Detect whether a linked shader contains static recursion
2080 * If the list of instructions is determined to contain static recursion,
2081 * \c link_error_printf will be called to emit error messages for each function
2082 * that is in the recursion cycle. In addition,
2083 * \c gl_shader_program::LinkStatus will be set to false.
2086 detect_recursion_linked(struct gl_shader_program
*prog
,
2087 exec_list
*instructions
);
2090 * Make a clone of each IR instruction in a list
2092 * \param in List of IR instructions that are to be cloned
2093 * \param out List to hold the cloned instructions
2096 clone_ir_list(void *mem_ctx
, exec_list
*out
, const exec_list
*in
);
2099 _mesa_glsl_initialize_variables(exec_list
*instructions
,
2100 struct _mesa_glsl_parse_state
*state
);
2103 _mesa_glsl_initialize_functions(_mesa_glsl_parse_state
*state
);
2106 _mesa_glsl_release_functions(void);
2109 reparent_ir(exec_list
*list
, void *mem_ctx
);
2111 struct glsl_symbol_table
;
2114 import_prototypes(const exec_list
*source
, exec_list
*dest
,
2115 struct glsl_symbol_table
*symbols
, void *mem_ctx
);
2118 ir_has_call(ir_instruction
*ir
);
2121 do_set_program_inouts(exec_list
*instructions
, struct gl_program
*prog
,
2122 GLenum shader_type
);
2125 prototype_string(const glsl_type
*return_type
, const char *name
,
2126 exec_list
*parameters
);
2129 #endif /* __cplusplus */
2131 extern void _mesa_print_ir(struct exec_list
*instructions
,
2132 struct _mesa_glsl_parse_state
*state
);
2139 vertices_per_prim(GLenum prim
);