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33 #include "glsl_types.h"
35 #include "ir_visitor.h"
36 #include "ir_hierarchical_visitor.h"
39 * \defgroup IR Intermediate representation nodes
47 * Each concrete class derived from \c ir_instruction has a value in this
48 * enumerant. The value for the type is stored in \c ir_instruction::ir_type
49 * by the constructor. While using type tags is not very C++, it is extremely
50 * convenient. For example, during debugging you can simply inspect
51 * \c ir_instruction::ir_type to find out the actual type of the object.
53 * In addition, it is possible to use a switch-statement based on \c
54 * \c ir_instruction::ir_type to select different behavior for different object
55 * types. For functions that have only slight differences for several object
56 * types, this allows writing very straightforward, readable code.
60 * Zero is unused so that the IR validator can detect cases where
61 * \c ir_instruction::ir_type has not been initialized.
68 ir_type_dereference_array
,
69 ir_type_dereference_record
,
70 ir_type_dereference_variable
,
74 ir_type_function_signature
,
81 ir_type_max
/**< maximum ir_type enum number, for validation */
85 * Base class of all IR instructions
87 class ir_instruction
: public exec_node
{
89 enum ir_node_type ir_type
;
90 const struct glsl_type
*type
;
92 /** ir_print_visitor helper for debugging. */
93 void print(void) const;
95 virtual void accept(ir_visitor
*) = 0;
96 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*) = 0;
97 virtual ir_instruction
*clone(void *mem_ctx
,
98 struct hash_table
*ht
) const = 0;
101 * \name IR instruction downcast functions
103 * These functions either cast the object to a derived class or return
104 * \c NULL if the object's type does not match the specified derived class.
105 * Additional downcast functions will be added as needed.
108 virtual class ir_variable
* as_variable() { return NULL
; }
109 virtual class ir_function
* as_function() { return NULL
; }
110 virtual class ir_dereference
* as_dereference() { return NULL
; }
111 virtual class ir_dereference_array
* as_dereference_array() { return NULL
; }
112 virtual class ir_dereference_variable
*as_dereference_variable() { return NULL
; }
113 virtual class ir_expression
* as_expression() { return NULL
; }
114 virtual class ir_rvalue
* as_rvalue() { return NULL
; }
115 virtual class ir_loop
* as_loop() { return NULL
; }
116 virtual class ir_assignment
* as_assignment() { return NULL
; }
117 virtual class ir_call
* as_call() { return NULL
; }
118 virtual class ir_return
* as_return() { return NULL
; }
119 virtual class ir_if
* as_if() { return NULL
; }
120 virtual class ir_swizzle
* as_swizzle() { return NULL
; }
121 virtual class ir_constant
* as_constant() { return NULL
; }
122 virtual class ir_discard
* as_discard() { return NULL
; }
128 ir_type
= ir_type_unset
;
134 class ir_rvalue
: public ir_instruction
{
136 virtual ir_rvalue
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
138 virtual ir_constant
*constant_expression_value() = 0;
140 virtual ir_rvalue
* as_rvalue()
145 ir_rvalue
*as_rvalue_to_saturate();
147 virtual bool is_lvalue()
153 * Get the variable that is ultimately referenced by an r-value
155 virtual ir_variable
*variable_referenced()
162 * If an r-value is a reference to a whole variable, get that variable
165 * Pointer to a variable that is completely dereferenced by the r-value. If
166 * the r-value is not a dereference or the dereference does not access the
167 * entire variable (i.e., it's just one array element, struct field), \c NULL
170 virtual ir_variable
*whole_variable_referenced()
176 * Determine if an r-value has the value zero
178 * The base implementation of this function always returns \c false. The
179 * \c ir_constant class over-rides this function to return \c true \b only
180 * for vector and scalar types that have all elements set to the value
181 * zero (or \c false for booleans).
183 * \sa ir_constant::has_value, ir_rvalue::is_one, ir_rvalue::is_negative_one
185 virtual bool is_zero() const;
188 * Determine if an r-value has the value one
190 * The base implementation of this function always returns \c false. The
191 * \c ir_constant class over-rides this function to return \c true \b only
192 * for vector and scalar types that have all elements set to the value
193 * one (or \c true for booleans).
195 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_negative_one
197 virtual bool is_one() const;
200 * Determine if an r-value has the value negative one
202 * The base implementation of this function always returns \c false. The
203 * \c ir_constant class over-rides this function to return \c true \b only
204 * for vector and scalar types that have all elements set to the value
205 * negative one. For boolean times, the result is always \c false.
207 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one
209 virtual bool is_negative_one() const;
217 * Variable storage classes
219 enum ir_variable_mode
{
220 ir_var_auto
= 0, /**< Function local variables and globals. */
221 ir_var_uniform
, /**< Variable declared as a uniform. */
225 ir_var_const_in
, /**< "in" param that must be a constant expression */
226 ir_var_system_value
, /**< Ex: front-face, instance-id, etc. */
227 ir_var_temporary
/**< Temporary variable generated during compilation. */
230 enum ir_variable_interpolation
{
237 * \brief Layout qualifiers for gl_FragDepth.
239 * The AMD_conservative_depth extension allows gl_FragDepth to be redeclared
240 * with a layout qualifier.
242 enum ir_depth_layout
{
243 ir_depth_layout_none
, /**< No depth layout is specified. */
245 ir_depth_layout_greater
,
246 ir_depth_layout_less
,
247 ir_depth_layout_unchanged
251 * \brief Convert depth layout qualifier to string.
254 depth_layout_string(ir_depth_layout layout
);
256 class ir_variable
: public ir_instruction
{
258 ir_variable(const struct glsl_type
*, const char *, ir_variable_mode
);
260 virtual ir_variable
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
262 virtual ir_variable
*as_variable()
267 virtual void accept(ir_visitor
*v
)
272 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
276 * Get the string value for the interpolation qualifier
278 * \return The string that would be used in a shader to specify \c
279 * mode will be returned.
281 * This function should only be used on a shader input or output variable.
283 const char *interpolation_string() const;
286 * Calculate the number of slots required to hold this variable
288 * This is used to determine how many uniform or varying locations a variable
289 * occupies. The count is in units of floating point components.
291 unsigned component_slots() const;
294 * Delcared name of the variable
299 * Highest element accessed with a constant expression array index
301 * Not used for non-array variables.
303 unsigned max_array_access
;
306 * Is the variable read-only?
308 * This is set for variables declared as \c const, shader inputs,
311 unsigned read_only
:1;
313 unsigned invariant
:1;
316 * Has this variable been used for reading or writing?
318 * Several GLSL semantic checks require knowledge of whether or not a
319 * variable has been used. For example, it is an error to redeclare a
320 * variable as invariant after it has been used.
325 * Storage class of the variable.
327 * \sa ir_variable_mode
332 * Interpolation mode for shader inputs / outputs
334 * \sa ir_variable_interpolation
336 unsigned interpolation
:2;
339 * Flag that the whole array is assignable
341 * In GLSL 1.20 and later whole arrays are assignable (and comparable for
342 * equality). This flag enables this behavior.
344 unsigned array_lvalue
:1;
347 * \name ARB_fragment_coord_conventions
350 unsigned origin_upper_left
:1;
351 unsigned pixel_center_integer
:1;
355 * \brief Layout qualifier for gl_FragDepth.
357 * This is not equal to \c ir_depth_layout_none if and only if this
358 * variable is \c gl_FragDepth and a layout qualifier is specified.
360 ir_depth_layout depth_layout
;
363 * Was the location explicitly set in the shader?
365 * If the location is explicitly set in the shader, it \b cannot be changed
366 * by the linker or by the API (e.g., calls to \c glBindAttribLocation have
369 unsigned explicit_location
:1;
372 * Storage location of the base of this variable
374 * The precise meaning of this field depends on the nature of the variable.
376 * - Vertex shader input: one of the values from \c gl_vert_attrib.
377 * - Vertex shader output: one of the values from \c gl_vert_result.
378 * - Fragment shader input: one of the values from \c gl_frag_attrib.
379 * - Fragment shader output: one of the values from \c gl_frag_result.
380 * - Uniforms: Per-stage uniform slot number.
381 * - Other: This field is not currently used.
383 * If the variable is a uniform, shader input, or shader output, and the
384 * slot has not been assigned, the value will be -1.
389 * Emit a warning if this variable is accessed.
391 const char *warn_extension
;
394 * Value assigned in the initializer of a variable declared "const"
396 ir_constant
*constant_value
;
402 * The representation of a function instance; may be the full definition or
403 * simply a prototype.
405 class ir_function_signature
: public ir_instruction
{
406 /* An ir_function_signature will be part of the list of signatures in
410 ir_function_signature(const glsl_type
*return_type
);
412 virtual ir_function_signature
*clone(void *mem_ctx
,
413 struct hash_table
*ht
) const;
414 ir_function_signature
*clone_prototype(void *mem_ctx
,
415 struct hash_table
*ht
) const;
417 virtual void accept(ir_visitor
*v
)
422 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
425 * Get the name of the function for which this is a signature
427 const char *function_name() const;
430 * Get a handle to the function for which this is a signature
432 * There is no setter function, this function returns a \c const pointer,
433 * and \c ir_function_signature::_function is private for a reason. The
434 * only way to make a connection between a function and function signature
435 * is via \c ir_function::add_signature. This helps ensure that certain
436 * invariants (i.e., a function signature is in the list of signatures for
437 * its \c _function) are met.
439 * \sa ir_function::add_signature
441 inline const class ir_function
*function() const
443 return this->_function
;
447 * Check whether the qualifiers match between this signature's parameters
448 * and the supplied parameter list. If not, returns the name of the first
449 * parameter with mismatched qualifiers (for use in error messages).
451 const char *qualifiers_match(exec_list
*params
);
454 * Replace the current parameter list with the given one. This is useful
455 * if the current information came from a prototype, and either has invalid
456 * or missing parameter names.
458 void replace_parameters(exec_list
*new_params
);
461 * Function return type.
463 * \note This discards the optional precision qualifier.
465 const struct glsl_type
*return_type
;
468 * List of ir_variable of function parameters.
470 * This represents the storage. The paramaters passed in a particular
471 * call will be in ir_call::actual_paramaters.
473 struct exec_list parameters
;
475 /** Whether or not this function has a body (which may be empty). */
476 unsigned is_defined
:1;
478 /** Whether or not this function signature is a built-in. */
479 unsigned is_builtin
:1;
481 /** Body of instructions in the function. */
482 struct exec_list body
;
485 /** Function of which this signature is one overload. */
486 class ir_function
*_function
;
488 friend class ir_function
;
493 * Header for tracking multiple overloaded functions with the same name.
494 * Contains a list of ir_function_signatures representing each of the
497 class ir_function
: public ir_instruction
{
499 ir_function(const char *name
);
501 virtual ir_function
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
503 virtual ir_function
*as_function()
508 virtual void accept(ir_visitor
*v
)
513 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
515 void add_signature(ir_function_signature
*sig
)
517 sig
->_function
= this;
518 this->signatures
.push_tail(sig
);
522 * Get an iterator for the set of function signatures
524 exec_list_iterator
iterator()
526 return signatures
.iterator();
530 * Find a signature that matches a set of actual parameters, taking implicit
531 * conversions into account.
533 ir_function_signature
*matching_signature(const exec_list
*actual_param
);
536 * Find a signature that exactly matches a set of actual parameters without
537 * any implicit type conversions.
539 ir_function_signature
*exact_matching_signature(const exec_list
*actual_ps
);
542 * Name of the function.
546 /** Whether or not this function has a signature that isn't a built-in. */
547 bool has_user_signature();
550 * List of ir_function_signature for each overloaded function with this name.
552 struct exec_list signatures
;
555 inline const char *ir_function_signature::function_name() const
557 return this->_function
->name
;
563 * IR instruction representing high-level if-statements
565 class ir_if
: public ir_instruction
{
567 ir_if(ir_rvalue
*condition
)
568 : condition(condition
)
570 ir_type
= ir_type_if
;
573 virtual ir_if
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
575 virtual ir_if
*as_if()
580 virtual void accept(ir_visitor
*v
)
585 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
587 ir_rvalue
*condition
;
588 /** List of ir_instruction for the body of the then branch */
589 exec_list then_instructions
;
590 /** List of ir_instruction for the body of the else branch */
591 exec_list else_instructions
;
596 * IR instruction representing a high-level loop structure.
598 class ir_loop
: public ir_instruction
{
602 virtual ir_loop
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
604 virtual void accept(ir_visitor
*v
)
609 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
611 virtual ir_loop
*as_loop()
617 * Get an iterator for the instructions of the loop body
619 exec_list_iterator
iterator()
621 return body_instructions
.iterator();
624 /** List of ir_instruction that make up the body of the loop. */
625 exec_list body_instructions
;
628 * \name Loop counter and controls
630 * Represents a loop like a FORTRAN \c do-loop.
633 * If \c from and \c to are the same value, the loop will execute once.
636 ir_rvalue
*from
; /** Value of the loop counter on the first
637 * iteration of the loop.
639 ir_rvalue
*to
; /** Value of the loop counter on the last
640 * iteration of the loop.
642 ir_rvalue
*increment
;
643 ir_variable
*counter
;
646 * Comparison operation in the loop terminator.
648 * If any of the loop control fields are non-\c NULL, this field must be
649 * one of \c ir_binop_less, \c ir_binop_greater, \c ir_binop_lequal,
650 * \c ir_binop_gequal, \c ir_binop_equal, or \c ir_binop_nequal.
657 class ir_assignment
: public ir_instruction
{
659 ir_assignment(ir_rvalue
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
);
662 * Construct an assignment with an explicit write mask
665 * Since a write mask is supplied, the LHS must already be a bare
666 * \c ir_dereference. The cannot be any swizzles in the LHS.
668 ir_assignment(ir_dereference
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
,
669 unsigned write_mask
);
671 virtual ir_assignment
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
673 virtual ir_constant
*constant_expression_value();
675 virtual void accept(ir_visitor
*v
)
680 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
682 virtual ir_assignment
* as_assignment()
688 * Get a whole variable written by an assignment
690 * If the LHS of the assignment writes a whole variable, the variable is
691 * returned. Otherwise \c NULL is returned. Examples of whole-variable
694 * - Assigning to a scalar
695 * - Assigning to all components of a vector
696 * - Whole array (or matrix) assignment
697 * - Whole structure assignment
699 ir_variable
*whole_variable_written();
702 * Set the LHS of an assignment
704 void set_lhs(ir_rvalue
*lhs
);
707 * Left-hand side of the assignment.
709 * This should be treated as read only. If you need to set the LHS of an
710 * assignment, use \c ir_assignment::set_lhs.
715 * Value being assigned
720 * Optional condition for the assignment.
722 ir_rvalue
*condition
;
726 * Component mask written
728 * For non-vector types in the LHS, this field will be zero. For vector
729 * types, a bit will be set for each component that is written. Note that
730 * for \c vec2 and \c vec3 types only the lower bits will ever be set.
732 * A partially-set write mask means that each enabled channel gets
733 * the value from a consecutive channel of the rhs. For example,
734 * to write just .xyw of gl_FrontColor with color:
736 * (assign (constant bool (1)) (xyw)
737 * (var_ref gl_FragColor)
738 * (swiz xyw (var_ref color)))
740 unsigned write_mask
:4;
743 /* Update ir_expression::num_operands() and operator_strs when
744 * updating this list.
746 enum ir_expression_operation
{
755 ir_unop_exp
, /**< Log base e on gentype */
756 ir_unop_log
, /**< Natural log on gentype */
759 ir_unop_f2i
, /**< Float-to-integer conversion. */
760 ir_unop_i2f
, /**< Integer-to-float conversion. */
761 ir_unop_f2b
, /**< Float-to-boolean conversion */
762 ir_unop_b2f
, /**< Boolean-to-float conversion */
763 ir_unop_i2b
, /**< int-to-boolean conversion */
764 ir_unop_b2i
, /**< Boolean-to-int conversion */
765 ir_unop_u2f
, /**< Unsigned-to-float conversion. */
769 * \name Unary floating-point rounding operations.
780 * \name Trigonometric operations.
785 ir_unop_sin_reduced
, /**< Reduced range sin. [-pi, pi] */
786 ir_unop_cos_reduced
, /**< Reduced range cos. [-pi, pi] */
790 * \name Partial derivatives.
800 * A sentinel marking the last of the unary operations.
802 ir_last_unop
= ir_unop_noise
,
810 * Takes one of two combinations of arguments:
815 * Does not take integer types.
820 * \name Binary comparison operators which return a boolean vector.
821 * The type of both operands must be equal.
831 * Returns single boolean for whether all components of operands[0]
832 * equal the components of operands[1].
836 * Returns single boolean for whether any component of operands[0]
837 * is not equal to the corresponding component of operands[1].
843 * \name Bit-wise binary operations.
864 * A sentinel marking the last of the binary operations.
866 ir_last_binop
= ir_binop_pow
,
871 * A sentinel marking the last of all operations.
873 ir_last_opcode
= ir_last_binop
876 class ir_expression
: public ir_rvalue
{
879 * Constructor for unary operation expressions
881 ir_expression(int op
, const struct glsl_type
*type
, ir_rvalue
*);
882 ir_expression(int op
, ir_rvalue
*);
885 * Constructor for binary operation expressions
887 ir_expression(int op
, const struct glsl_type
*type
,
888 ir_rvalue
*, ir_rvalue
*);
889 ir_expression(int op
, ir_rvalue
*op0
, ir_rvalue
*op1
);
892 * Constructor for quad operator expressions
894 ir_expression(int op
, const struct glsl_type
*type
,
895 ir_rvalue
*, ir_rvalue
*, ir_rvalue
*, ir_rvalue
*);
897 virtual ir_expression
*as_expression()
902 virtual ir_expression
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
905 * Attempt to constant-fold the expression
907 * If the expression cannot be constant folded, this method will return
910 virtual ir_constant
*constant_expression_value();
913 * Determine the number of operands used by an expression
915 static unsigned int get_num_operands(ir_expression_operation
);
918 * Determine the number of operands used by an expression
920 unsigned int get_num_operands() const
922 return (this->operation
== ir_quadop_vector
)
923 ? this->type
->vector_elements
: get_num_operands(operation
);
927 * Return a string representing this expression's operator.
929 const char *operator_string();
932 * Return a string representing this expression's operator.
934 static const char *operator_string(ir_expression_operation
);
938 * Do a reverse-lookup to translate the given string into an operator.
940 static ir_expression_operation
get_operator(const char *);
942 virtual void accept(ir_visitor
*v
)
947 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
949 ir_expression_operation operation
;
950 ir_rvalue
*operands
[4];
955 * IR instruction representing a function call
957 class ir_call
: public ir_rvalue
{
959 ir_call(ir_function_signature
*callee
, exec_list
*actual_parameters
)
962 ir_type
= ir_type_call
;
963 assert(callee
->return_type
!= NULL
);
964 type
= callee
->return_type
;
965 actual_parameters
->move_nodes_to(& this->actual_parameters
);
968 virtual ir_call
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
970 virtual ir_constant
*constant_expression_value();
972 virtual ir_call
*as_call()
977 virtual void accept(ir_visitor
*v
)
982 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
985 * Get a generic ir_call object when an error occurs
987 * Any allocation will be performed with 'ctx' as ralloc owner.
989 static ir_call
*get_error_instruction(void *ctx
);
992 * Get an iterator for the set of acutal parameters
994 exec_list_iterator
iterator()
996 return actual_parameters
.iterator();
1000 * Get the name of the function being called.
1002 const char *callee_name() const
1004 return callee
->function_name();
1008 * Get the function signature bound to this function call
1010 ir_function_signature
*get_callee()
1016 * Set the function call target
1018 void set_callee(ir_function_signature
*sig
);
1021 * Generates an inline version of the function before @ir,
1022 * returning the return value of the function.
1024 ir_rvalue
*generate_inline(ir_instruction
*ir
);
1026 /* List of ir_rvalue of paramaters passed in this call. */
1027 exec_list actual_parameters
;
1033 this->ir_type
= ir_type_call
;
1036 ir_function_signature
*callee
;
1041 * \name Jump-like IR instructions.
1043 * These include \c break, \c continue, \c return, and \c discard.
1046 class ir_jump
: public ir_instruction
{
1050 ir_type
= ir_type_unset
;
1054 class ir_return
: public ir_jump
{
1059 this->ir_type
= ir_type_return
;
1062 ir_return(ir_rvalue
*value
)
1065 this->ir_type
= ir_type_return
;
1068 virtual ir_return
*clone(void *mem_ctx
, struct hash_table
*) const;
1070 virtual ir_return
*as_return()
1075 ir_rvalue
*get_value() const
1080 virtual void accept(ir_visitor
*v
)
1085 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1092 * Jump instructions used inside loops
1094 * These include \c break and \c continue. The \c break within a loop is
1095 * different from the \c break within a switch-statement.
1097 * \sa ir_switch_jump
1099 class ir_loop_jump
: public ir_jump
{
1106 ir_loop_jump(jump_mode mode
)
1108 this->ir_type
= ir_type_loop_jump
;
1113 virtual ir_loop_jump
*clone(void *mem_ctx
, struct hash_table
*) const;
1115 virtual void accept(ir_visitor
*v
)
1120 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1122 bool is_break() const
1124 return mode
== jump_break
;
1127 bool is_continue() const
1129 return mode
== jump_continue
;
1132 /** Mode selector for the jump instruction. */
1133 enum jump_mode mode
;
1135 /** Loop containing this break instruction. */
1140 * IR instruction representing discard statements.
1142 class ir_discard
: public ir_jump
{
1146 this->ir_type
= ir_type_discard
;
1147 this->condition
= NULL
;
1150 ir_discard(ir_rvalue
*cond
)
1152 this->ir_type
= ir_type_discard
;
1153 this->condition
= cond
;
1156 virtual ir_discard
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1158 virtual void accept(ir_visitor
*v
)
1163 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1165 virtual ir_discard
*as_discard()
1170 ir_rvalue
*condition
;
1176 * Texture sampling opcodes used in ir_texture
1178 enum ir_texture_opcode
{
1179 ir_tex
, /**< Regular texture look-up */
1180 ir_txb
, /**< Texture look-up with LOD bias */
1181 ir_txl
, /**< Texture look-up with explicit LOD */
1182 ir_txd
, /**< Texture look-up with partial derivatvies */
1183 ir_txf
/**< Texel fetch with explicit LOD */
1188 * IR instruction to sample a texture
1190 * The specific form of the IR instruction depends on the \c mode value
1191 * selected from \c ir_texture_opcodes. In the printed IR, these will
1194 * Texel offset (0 or an expression)
1195 * | Projection divisor
1196 * | | Shadow comparitor
1199 * (tex <sampler> <coordinate> 0 1 ( ))
1200 * (txb <sampler> <coordinate> 0 1 ( ) <bias>)
1201 * (txl <sampler> <coordinate> 0 1 ( ) <lod>)
1202 * (txd <sampler> <coordinate> 0 1 ( ) (dPdx dPdy))
1203 * (txf <sampler> <coordinate> 0 <lod>)
1205 class ir_texture
: public ir_rvalue
{
1207 ir_texture(enum ir_texture_opcode op
)
1208 : op(op
), projector(NULL
), shadow_comparitor(NULL
), offset(NULL
)
1210 this->ir_type
= ir_type_texture
;
1213 virtual ir_texture
*clone(void *mem_ctx
, struct hash_table
*) const;
1215 virtual ir_constant
*constant_expression_value();
1217 virtual void accept(ir_visitor
*v
)
1222 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1225 * Return a string representing the ir_texture_opcode.
1227 const char *opcode_string();
1229 /** Set the sampler and infer the type. */
1230 void set_sampler(ir_dereference
*sampler
);
1233 * Do a reverse-lookup to translate a string into an ir_texture_opcode.
1235 static ir_texture_opcode
get_opcode(const char *);
1237 enum ir_texture_opcode op
;
1239 /** Sampler to use for the texture access. */
1240 ir_dereference
*sampler
;
1242 /** Texture coordinate to sample */
1243 ir_rvalue
*coordinate
;
1246 * Value used for projective divide.
1248 * If there is no projective divide (the common case), this will be
1249 * \c NULL. Optimization passes should check for this to point to a constant
1250 * of 1.0 and replace that with \c NULL.
1252 ir_rvalue
*projector
;
1255 * Coordinate used for comparison on shadow look-ups.
1257 * If there is no shadow comparison, this will be \c NULL. For the
1258 * \c ir_txf opcode, this *must* be \c NULL.
1260 ir_rvalue
*shadow_comparitor
;
1262 /** Texel offset. */
1266 ir_rvalue
*lod
; /**< Floating point LOD */
1267 ir_rvalue
*bias
; /**< Floating point LOD bias */
1269 ir_rvalue
*dPdx
; /**< Partial derivative of coordinate wrt X */
1270 ir_rvalue
*dPdy
; /**< Partial derivative of coordinate wrt Y */
1276 struct ir_swizzle_mask
{
1283 * Number of components in the swizzle.
1285 unsigned num_components
:3;
1288 * Does the swizzle contain duplicate components?
1290 * L-value swizzles cannot contain duplicate components.
1292 unsigned has_duplicates
:1;
1296 class ir_swizzle
: public ir_rvalue
{
1298 ir_swizzle(ir_rvalue
*, unsigned x
, unsigned y
, unsigned z
, unsigned w
,
1301 ir_swizzle(ir_rvalue
*val
, const unsigned *components
, unsigned count
);
1303 ir_swizzle(ir_rvalue
*val
, ir_swizzle_mask mask
);
1305 virtual ir_swizzle
*clone(void *mem_ctx
, struct hash_table
*) const;
1307 virtual ir_constant
*constant_expression_value();
1309 virtual ir_swizzle
*as_swizzle()
1315 * Construct an ir_swizzle from the textual representation. Can fail.
1317 static ir_swizzle
*create(ir_rvalue
*, const char *, unsigned vector_length
);
1319 virtual void accept(ir_visitor
*v
)
1324 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1328 return val
->is_lvalue() && !mask
.has_duplicates
;
1332 * Get the variable that is ultimately referenced by an r-value
1334 virtual ir_variable
*variable_referenced();
1337 ir_swizzle_mask mask
;
1341 * Initialize the mask component of a swizzle
1343 * This is used by the \c ir_swizzle constructors.
1345 void init_mask(const unsigned *components
, unsigned count
);
1349 class ir_dereference
: public ir_rvalue
{
1351 virtual ir_dereference
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
1353 virtual ir_dereference
*as_dereference()
1361 * Get the variable that is ultimately referenced by an r-value
1363 virtual ir_variable
*variable_referenced() = 0;
1367 class ir_dereference_variable
: public ir_dereference
{
1369 ir_dereference_variable(ir_variable
*var
);
1371 virtual ir_dereference_variable
*clone(void *mem_ctx
,
1372 struct hash_table
*) const;
1374 virtual ir_constant
*constant_expression_value();
1376 virtual ir_dereference_variable
*as_dereference_variable()
1382 * Get the variable that is ultimately referenced by an r-value
1384 virtual ir_variable
*variable_referenced()
1389 virtual ir_variable
*whole_variable_referenced()
1391 /* ir_dereference_variable objects always dereference the entire
1392 * variable. However, if this dereference is dereferenced by anything
1393 * else, the complete deferefernce chain is not a whole-variable
1394 * dereference. This method should only be called on the top most
1395 * ir_rvalue in a dereference chain.
1400 virtual void accept(ir_visitor
*v
)
1405 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1408 * Object being dereferenced.
1414 class ir_dereference_array
: public ir_dereference
{
1416 ir_dereference_array(ir_rvalue
*value
, ir_rvalue
*array_index
);
1418 ir_dereference_array(ir_variable
*var
, ir_rvalue
*array_index
);
1420 virtual ir_dereference_array
*clone(void *mem_ctx
,
1421 struct hash_table
*) const;
1423 virtual ir_constant
*constant_expression_value();
1425 virtual ir_dereference_array
*as_dereference_array()
1431 * Get the variable that is ultimately referenced by an r-value
1433 virtual ir_variable
*variable_referenced()
1435 return this->array
->variable_referenced();
1438 virtual void accept(ir_visitor
*v
)
1443 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1446 ir_rvalue
*array_index
;
1449 void set_array(ir_rvalue
*value
);
1453 class ir_dereference_record
: public ir_dereference
{
1455 ir_dereference_record(ir_rvalue
*value
, const char *field
);
1457 ir_dereference_record(ir_variable
*var
, const char *field
);
1459 virtual ir_dereference_record
*clone(void *mem_ctx
,
1460 struct hash_table
*) const;
1462 virtual ir_constant
*constant_expression_value();
1465 * Get the variable that is ultimately referenced by an r-value
1467 virtual ir_variable
*variable_referenced()
1469 return this->record
->variable_referenced();
1472 virtual void accept(ir_visitor
*v
)
1477 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1485 * Data stored in an ir_constant
1487 union ir_constant_data
{
1495 class ir_constant
: public ir_rvalue
{
1497 ir_constant(const struct glsl_type
*type
, const ir_constant_data
*data
);
1498 ir_constant(bool b
);
1499 ir_constant(unsigned int u
);
1501 ir_constant(float f
);
1504 * Construct an ir_constant from a list of ir_constant values
1506 ir_constant(const struct glsl_type
*type
, exec_list
*values
);
1509 * Construct an ir_constant from a scalar component of another ir_constant
1511 * The new \c ir_constant inherits the type of the component from the
1515 * In the case of a matrix constant, the new constant is a scalar, \b not
1518 ir_constant(const ir_constant
*c
, unsigned i
);
1521 * Return a new ir_constant of the specified type containing all zeros.
1523 static ir_constant
*zero(void *mem_ctx
, const glsl_type
*type
);
1525 virtual ir_constant
*clone(void *mem_ctx
, struct hash_table
*) const;
1527 virtual ir_constant
*constant_expression_value();
1529 virtual ir_constant
*as_constant()
1534 virtual void accept(ir_visitor
*v
)
1539 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1542 * Get a particular component of a constant as a specific type
1544 * This is useful, for example, to get a value from an integer constant
1545 * as a float or bool. This appears frequently when constructors are
1546 * called with all constant parameters.
1549 bool get_bool_component(unsigned i
) const;
1550 float get_float_component(unsigned i
) const;
1551 int get_int_component(unsigned i
) const;
1552 unsigned get_uint_component(unsigned i
) const;
1555 ir_constant
*get_array_element(unsigned i
) const;
1557 ir_constant
*get_record_field(const char *name
);
1560 * Determine whether a constant has the same value as another constant
1562 * \sa ir_constant::is_zero, ir_constant::is_one,
1563 * ir_constant::is_negative_one
1565 bool has_value(const ir_constant
*) const;
1567 virtual bool is_zero() const;
1568 virtual bool is_one() const;
1569 virtual bool is_negative_one() const;
1572 * Value of the constant.
1574 * The field used to back the values supplied by the constant is determined
1575 * by the type associated with the \c ir_instruction. Constants may be
1576 * scalars, vectors, or matrices.
1578 union ir_constant_data value
;
1580 /* Array elements */
1581 ir_constant
**array_elements
;
1583 /* Structure fields */
1584 exec_list components
;
1588 * Parameterless constructor only used by the clone method
1596 * Apply a visitor to each IR node in a list
1599 visit_exec_list(exec_list
*list
, ir_visitor
*visitor
);
1602 * Validate invariants on each IR node in a list
1604 void validate_ir_tree(exec_list
*instructions
);
1607 * Make a clone of each IR instruction in a list
1609 * \param in List of IR instructions that are to be cloned
1610 * \param out List to hold the cloned instructions
1613 clone_ir_list(void *mem_ctx
, exec_list
*out
, const exec_list
*in
);
1616 _mesa_glsl_initialize_variables(exec_list
*instructions
,
1617 struct _mesa_glsl_parse_state
*state
);
1620 _mesa_glsl_initialize_functions(_mesa_glsl_parse_state
*state
);
1623 _mesa_glsl_release_functions(void);
1626 reparent_ir(exec_list
*list
, void *mem_ctx
);
1628 struct glsl_symbol_table
;
1631 import_prototypes(const exec_list
*source
, exec_list
*dest
,
1632 struct glsl_symbol_table
*symbols
, void *mem_ctx
);
1635 ir_has_call(ir_instruction
*ir
);
1638 do_set_program_inouts(exec_list
*instructions
, struct gl_program
*prog
);