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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"
40 * \defgroup IR Intermediate representation nodes
48 * Each concrete class derived from \c ir_instruction has a value in this
49 * enumerant. The value for the type is stored in \c ir_instruction::ir_type
50 * by the constructor. While using type tags is not very C++, it is extremely
51 * convenient. For example, during debugging you can simply inspect
52 * \c ir_instruction::ir_type to find out the actual type of the object.
54 * In addition, it is possible to use a switch-statement based on \c
55 * \c ir_instruction::ir_type to select different behavior for different object
56 * types. For functions that have only slight differences for several object
57 * types, this allows writing very straightforward, readable code.
61 * Zero is unused so that the IR validator can detect cases where
62 * \c ir_instruction::ir_type has not been initialized.
69 ir_type_dereference_array
,
70 ir_type_dereference_record
,
71 ir_type_dereference_variable
,
75 ir_type_function_signature
,
82 ir_type_max
/**< maximum ir_type enum number, for validation */
86 * Base class of all IR instructions
88 class ir_instruction
: public exec_node
{
90 enum ir_node_type ir_type
;
91 const struct glsl_type
*type
;
93 /** ir_print_visitor helper for debugging. */
94 void print(void) const;
96 virtual void accept(ir_visitor
*) = 0;
97 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*) = 0;
98 virtual ir_instruction
*clone(void *mem_ctx
,
99 struct hash_table
*ht
) const = 0;
102 * \name IR instruction downcast functions
104 * These functions either cast the object to a derived class or return
105 * \c NULL if the object's type does not match the specified derived class.
106 * Additional downcast functions will be added as needed.
109 virtual class ir_variable
* as_variable() { return NULL
; }
110 virtual class ir_function
* as_function() { return NULL
; }
111 virtual class ir_dereference
* as_dereference() { return NULL
; }
112 virtual class ir_dereference_array
* as_dereference_array() { return NULL
; }
113 virtual class ir_dereference_variable
*as_dereference_variable() { return NULL
; }
114 virtual class ir_expression
* as_expression() { return NULL
; }
115 virtual class ir_rvalue
* as_rvalue() { return NULL
; }
116 virtual class ir_loop
* as_loop() { return NULL
; }
117 virtual class ir_assignment
* as_assignment() { return NULL
; }
118 virtual class ir_call
* as_call() { return NULL
; }
119 virtual class ir_return
* as_return() { return NULL
; }
120 virtual class ir_if
* as_if() { return NULL
; }
121 virtual class ir_swizzle
* as_swizzle() { return NULL
; }
122 virtual class ir_constant
* as_constant() { return NULL
; }
123 virtual class ir_discard
* as_discard() { return NULL
; }
129 ir_type
= ir_type_unset
;
135 class ir_rvalue
: public ir_instruction
{
137 virtual ir_rvalue
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
139 virtual ir_constant
*constant_expression_value() = 0;
141 virtual ir_rvalue
* as_rvalue()
146 ir_rvalue
*as_rvalue_to_saturate();
148 virtual bool is_lvalue() const
154 * Get the variable that is ultimately referenced by an r-value
156 virtual ir_variable
*variable_referenced() const
163 * If an r-value is a reference to a whole variable, get that variable
166 * Pointer to a variable that is completely dereferenced by the r-value. If
167 * the r-value is not a dereference or the dereference does not access the
168 * entire variable (i.e., it's just one array element, struct field), \c NULL
171 virtual ir_variable
*whole_variable_referenced()
177 * Determine if an r-value has the value zero
179 * The base implementation of this function always returns \c false. The
180 * \c ir_constant class over-rides this function to return \c true \b only
181 * for vector and scalar types that have all elements set to the value
182 * zero (or \c false for booleans).
184 * \sa ir_constant::has_value, ir_rvalue::is_one, ir_rvalue::is_negative_one
186 virtual bool is_zero() const;
189 * Determine if an r-value has the value one
191 * The base implementation of this function always returns \c false. The
192 * \c ir_constant class over-rides this function to return \c true \b only
193 * for vector and scalar types that have all elements set to the value
194 * one (or \c true for booleans).
196 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_negative_one
198 virtual bool is_one() const;
201 * Determine if an r-value has the value negative one
203 * The base implementation of this function always returns \c false. The
204 * \c ir_constant class over-rides this function to return \c true \b only
205 * for vector and scalar types that have all elements set to the value
206 * negative one. For boolean times, the result is always \c false.
208 * \sa ir_constant::has_value, ir_rvalue::is_zero, ir_rvalue::is_one
210 virtual bool is_negative_one() const;
218 * Variable storage classes
220 enum ir_variable_mode
{
221 ir_var_auto
= 0, /**< Function local variables and globals. */
222 ir_var_uniform
, /**< Variable declared as a uniform. */
226 ir_var_const_in
, /**< "in" param that must be a constant expression */
227 ir_var_system_value
, /**< Ex: front-face, instance-id, etc. */
228 ir_var_temporary
/**< Temporary variable generated during compilation. */
232 * \brief Layout qualifiers for gl_FragDepth.
234 * The AMD/ARB_conservative_depth extensions allow gl_FragDepth to be redeclared
235 * with a layout qualifier.
237 enum ir_depth_layout
{
238 ir_depth_layout_none
, /**< No depth layout is specified. */
240 ir_depth_layout_greater
,
241 ir_depth_layout_less
,
242 ir_depth_layout_unchanged
246 * \brief Convert depth layout qualifier to string.
249 depth_layout_string(ir_depth_layout layout
);
252 * Description of built-in state associated with a uniform
254 * \sa ir_variable::state_slots
256 struct ir_state_slot
{
261 class ir_variable
: public ir_instruction
{
263 ir_variable(const struct glsl_type
*, const char *, ir_variable_mode
);
265 virtual ir_variable
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
267 virtual ir_variable
*as_variable()
272 virtual void accept(ir_visitor
*v
)
277 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
281 * Get the string value for the interpolation qualifier
283 * \return The string that would be used in a shader to specify \c
284 * mode will be returned.
286 * This function is used to generate error messages of the form "shader
287 * uses %s interpolation qualifier", so in the case where there is no
288 * interpolation qualifier, it returns "no".
290 * This function should only be used on a shader input or output variable.
292 const char *interpolation_string() const;
295 * Delcared name of the variable
300 * Highest element accessed with a constant expression array index
302 * Not used for non-array variables.
304 unsigned max_array_access
;
307 * Is the variable read-only?
309 * This is set for variables declared as \c const, shader inputs,
312 unsigned read_only
:1;
314 unsigned invariant
:1;
317 * Has this variable been used for reading or writing?
319 * Several GLSL semantic checks require knowledge of whether or not a
320 * variable has been used. For example, it is an error to redeclare a
321 * variable as invariant after it has been used.
326 * Storage class of the variable.
328 * \sa ir_variable_mode
333 * Interpolation mode for shader inputs / outputs
335 * \sa ir_variable_interpolation
337 unsigned interpolation
:2;
340 * \name ARB_fragment_coord_conventions
343 unsigned origin_upper_left
:1;
344 unsigned pixel_center_integer
:1;
348 * \brief Layout qualifier for gl_FragDepth.
350 * This is not equal to \c ir_depth_layout_none if and only if this
351 * variable is \c gl_FragDepth and a layout qualifier is specified.
353 ir_depth_layout depth_layout
;
356 * Was the location explicitly set in the shader?
358 * If the location is explicitly set in the shader, it \b cannot be changed
359 * by the linker or by the API (e.g., calls to \c glBindAttribLocation have
362 unsigned explicit_location
:1;
365 * Storage location of the base of this variable
367 * The precise meaning of this field depends on the nature of the variable.
369 * - Vertex shader input: one of the values from \c gl_vert_attrib.
370 * - Vertex shader output: one of the values from \c gl_vert_result.
371 * - Fragment shader input: one of the values from \c gl_frag_attrib.
372 * - Fragment shader output: one of the values from \c gl_frag_result.
373 * - Uniforms: Per-stage uniform slot number.
374 * - Other: This field is not currently used.
376 * If the variable is a uniform, shader input, or shader output, and the
377 * slot has not been assigned, the value will be -1.
382 * Built-in state that backs this uniform
384 * Once set at variable creation, \c state_slots must remain invariant.
385 * This is because, ideally, this array would be shared by all clones of
386 * this variable in the IR tree. In other words, we'd really like for it
387 * to be a fly-weight.
389 * If the variable is not a uniform, \c num_state_slots will be zero and
390 * \c state_slots will be \c NULL.
393 unsigned num_state_slots
; /**< Number of state slots used */
394 ir_state_slot
*state_slots
; /**< State descriptors. */
398 * Emit a warning if this variable is accessed.
400 const char *warn_extension
;
403 * Value assigned in the initializer of a variable declared "const"
405 ir_constant
*constant_value
;
411 * The representation of a function instance; may be the full definition or
412 * simply a prototype.
414 class ir_function_signature
: public ir_instruction
{
415 /* An ir_function_signature will be part of the list of signatures in
419 ir_function_signature(const glsl_type
*return_type
);
421 virtual ir_function_signature
*clone(void *mem_ctx
,
422 struct hash_table
*ht
) const;
423 ir_function_signature
*clone_prototype(void *mem_ctx
,
424 struct hash_table
*ht
) const;
426 virtual void accept(ir_visitor
*v
)
431 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
434 * Get the name of the function for which this is a signature
436 const char *function_name() const;
439 * Get a handle to the function for which this is a signature
441 * There is no setter function, this function returns a \c const pointer,
442 * and \c ir_function_signature::_function is private for a reason. The
443 * only way to make a connection between a function and function signature
444 * is via \c ir_function::add_signature. This helps ensure that certain
445 * invariants (i.e., a function signature is in the list of signatures for
446 * its \c _function) are met.
448 * \sa ir_function::add_signature
450 inline const class ir_function
*function() const
452 return this->_function
;
456 * Check whether the qualifiers match between this signature's parameters
457 * and the supplied parameter list. If not, returns the name of the first
458 * parameter with mismatched qualifiers (for use in error messages).
460 const char *qualifiers_match(exec_list
*params
);
463 * Replace the current parameter list with the given one. This is useful
464 * if the current information came from a prototype, and either has invalid
465 * or missing parameter names.
467 void replace_parameters(exec_list
*new_params
);
470 * Function return type.
472 * \note This discards the optional precision qualifier.
474 const struct glsl_type
*return_type
;
477 * List of ir_variable of function parameters.
479 * This represents the storage. The paramaters passed in a particular
480 * call will be in ir_call::actual_paramaters.
482 struct exec_list parameters
;
484 /** Whether or not this function has a body (which may be empty). */
485 unsigned is_defined
:1;
487 /** Whether or not this function signature is a built-in. */
488 unsigned is_builtin
:1;
490 /** Body of instructions in the function. */
491 struct exec_list body
;
494 /** Function of which this signature is one overload. */
495 class ir_function
*_function
;
497 friend class ir_function
;
502 * Header for tracking multiple overloaded functions with the same name.
503 * Contains a list of ir_function_signatures representing each of the
506 class ir_function
: public ir_instruction
{
508 ir_function(const char *name
);
510 virtual ir_function
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
512 virtual ir_function
*as_function()
517 virtual void accept(ir_visitor
*v
)
522 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
524 void add_signature(ir_function_signature
*sig
)
526 sig
->_function
= this;
527 this->signatures
.push_tail(sig
);
531 * Get an iterator for the set of function signatures
533 exec_list_iterator
iterator()
535 return signatures
.iterator();
539 * Find a signature that matches a set of actual parameters, taking implicit
540 * conversions into account.
542 ir_function_signature
*matching_signature(const exec_list
*actual_param
);
545 * Find a signature that exactly matches a set of actual parameters without
546 * any implicit type conversions.
548 ir_function_signature
*exact_matching_signature(const exec_list
*actual_ps
);
551 * Name of the function.
555 /** Whether or not this function has a signature that isn't a built-in. */
556 bool has_user_signature();
559 * List of ir_function_signature for each overloaded function with this name.
561 struct exec_list signatures
;
564 inline const char *ir_function_signature::function_name() const
566 return this->_function
->name
;
572 * IR instruction representing high-level if-statements
574 class ir_if
: public ir_instruction
{
576 ir_if(ir_rvalue
*condition
)
577 : condition(condition
)
579 ir_type
= ir_type_if
;
582 virtual ir_if
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
584 virtual ir_if
*as_if()
589 virtual void accept(ir_visitor
*v
)
594 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
596 ir_rvalue
*condition
;
597 /** List of ir_instruction for the body of the then branch */
598 exec_list then_instructions
;
599 /** List of ir_instruction for the body of the else branch */
600 exec_list else_instructions
;
605 * IR instruction representing a high-level loop structure.
607 class ir_loop
: public ir_instruction
{
611 virtual ir_loop
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
613 virtual void accept(ir_visitor
*v
)
618 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
620 virtual ir_loop
*as_loop()
626 * Get an iterator for the instructions of the loop body
628 exec_list_iterator
iterator()
630 return body_instructions
.iterator();
633 /** List of ir_instruction that make up the body of the loop. */
634 exec_list body_instructions
;
637 * \name Loop counter and controls
639 * Represents a loop like a FORTRAN \c do-loop.
642 * If \c from and \c to are the same value, the loop will execute once.
645 ir_rvalue
*from
; /** Value of the loop counter on the first
646 * iteration of the loop.
648 ir_rvalue
*to
; /** Value of the loop counter on the last
649 * iteration of the loop.
651 ir_rvalue
*increment
;
652 ir_variable
*counter
;
655 * Comparison operation in the loop terminator.
657 * If any of the loop control fields are non-\c NULL, this field must be
658 * one of \c ir_binop_less, \c ir_binop_greater, \c ir_binop_lequal,
659 * \c ir_binop_gequal, \c ir_binop_equal, or \c ir_binop_nequal.
666 class ir_assignment
: public ir_instruction
{
668 ir_assignment(ir_rvalue
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
= NULL
);
671 * Construct an assignment with an explicit write mask
674 * Since a write mask is supplied, the LHS must already be a bare
675 * \c ir_dereference. The cannot be any swizzles in the LHS.
677 ir_assignment(ir_dereference
*lhs
, ir_rvalue
*rhs
, ir_rvalue
*condition
,
678 unsigned write_mask
);
680 virtual ir_assignment
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
682 virtual ir_constant
*constant_expression_value();
684 virtual void accept(ir_visitor
*v
)
689 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
691 virtual ir_assignment
* as_assignment()
697 * Get a whole variable written by an assignment
699 * If the LHS of the assignment writes a whole variable, the variable is
700 * returned. Otherwise \c NULL is returned. Examples of whole-variable
703 * - Assigning to a scalar
704 * - Assigning to all components of a vector
705 * - Whole array (or matrix) assignment
706 * - Whole structure assignment
708 ir_variable
*whole_variable_written();
711 * Set the LHS of an assignment
713 void set_lhs(ir_rvalue
*lhs
);
716 * Left-hand side of the assignment.
718 * This should be treated as read only. If you need to set the LHS of an
719 * assignment, use \c ir_assignment::set_lhs.
724 * Value being assigned
729 * Optional condition for the assignment.
731 ir_rvalue
*condition
;
735 * Component mask written
737 * For non-vector types in the LHS, this field will be zero. For vector
738 * types, a bit will be set for each component that is written. Note that
739 * for \c vec2 and \c vec3 types only the lower bits will ever be set.
741 * A partially-set write mask means that each enabled channel gets
742 * the value from a consecutive channel of the rhs. For example,
743 * to write just .xyw of gl_FrontColor with color:
745 * (assign (constant bool (1)) (xyw)
746 * (var_ref gl_FragColor)
747 * (swiz xyw (var_ref color)))
749 unsigned write_mask
:4;
752 /* Update ir_expression::num_operands() and operator_strs when
753 * updating this list.
755 enum ir_expression_operation
{
764 ir_unop_exp
, /**< Log base e on gentype */
765 ir_unop_log
, /**< Natural log on gentype */
768 ir_unop_f2i
, /**< Float-to-integer conversion. */
769 ir_unop_i2f
, /**< Integer-to-float conversion. */
770 ir_unop_f2b
, /**< Float-to-boolean conversion */
771 ir_unop_b2f
, /**< Boolean-to-float conversion */
772 ir_unop_i2b
, /**< int-to-boolean conversion */
773 ir_unop_b2i
, /**< Boolean-to-int conversion */
774 ir_unop_u2f
, /**< Unsigned-to-float conversion. */
775 ir_unop_i2u
, /**< Integer-to-unsigned conversion. */
776 ir_unop_u2i
, /**< Unsigned-to-integer conversion. */
780 * \name Unary floating-point rounding operations.
791 * \name Trigonometric operations.
796 ir_unop_sin_reduced
, /**< Reduced range sin. [-pi, pi] */
797 ir_unop_cos_reduced
, /**< Reduced range cos. [-pi, pi] */
801 * \name Partial derivatives.
811 * A sentinel marking the last of the unary operations.
813 ir_last_unop
= ir_unop_noise
,
821 * Takes one of two combinations of arguments:
826 * Does not take integer types.
831 * \name Binary comparison operators which return a boolean vector.
832 * The type of both operands must be equal.
842 * Returns single boolean for whether all components of operands[0]
843 * equal the components of operands[1].
847 * Returns single boolean for whether any component of operands[0]
848 * is not equal to the corresponding component of operands[1].
854 * \name Bit-wise binary operations.
875 * A sentinel marking the last of the binary operations.
877 ir_last_binop
= ir_binop_pow
,
882 * A sentinel marking the last of all operations.
884 ir_last_opcode
= ir_last_binop
887 class ir_expression
: public ir_rvalue
{
890 * Constructor for unary operation expressions
892 ir_expression(int op
, const struct glsl_type
*type
, ir_rvalue
*);
893 ir_expression(int op
, ir_rvalue
*);
896 * Constructor for binary operation expressions
898 ir_expression(int op
, const struct glsl_type
*type
,
899 ir_rvalue
*, ir_rvalue
*);
900 ir_expression(int op
, ir_rvalue
*op0
, ir_rvalue
*op1
);
903 * Constructor for quad operator expressions
905 ir_expression(int op
, const struct glsl_type
*type
,
906 ir_rvalue
*, ir_rvalue
*, ir_rvalue
*, ir_rvalue
*);
908 virtual ir_expression
*as_expression()
913 virtual ir_expression
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
916 * Attempt to constant-fold the expression
918 * If the expression cannot be constant folded, this method will return
921 virtual ir_constant
*constant_expression_value();
924 * Determine the number of operands used by an expression
926 static unsigned int get_num_operands(ir_expression_operation
);
929 * Determine the number of operands used by an expression
931 unsigned int get_num_operands() const
933 return (this->operation
== ir_quadop_vector
)
934 ? this->type
->vector_elements
: get_num_operands(operation
);
938 * Return a string representing this expression's operator.
940 const char *operator_string();
943 * Return a string representing this expression's operator.
945 static const char *operator_string(ir_expression_operation
);
949 * Do a reverse-lookup to translate the given string into an operator.
951 static ir_expression_operation
get_operator(const char *);
953 virtual void accept(ir_visitor
*v
)
958 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
960 ir_expression_operation operation
;
961 ir_rvalue
*operands
[4];
966 * IR instruction representing a function call
968 class ir_call
: public ir_rvalue
{
970 ir_call(ir_function_signature
*callee
, exec_list
*actual_parameters
)
973 ir_type
= ir_type_call
;
974 assert(callee
->return_type
!= NULL
);
975 type
= callee
->return_type
;
976 actual_parameters
->move_nodes_to(& this->actual_parameters
);
977 this->use_builtin
= callee
->is_builtin
;
980 virtual ir_call
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
982 virtual ir_constant
*constant_expression_value();
984 virtual ir_call
*as_call()
989 virtual void accept(ir_visitor
*v
)
994 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
997 * Get a generic ir_call object when an error occurs
999 * Any allocation will be performed with 'ctx' as ralloc owner.
1001 static ir_call
*get_error_instruction(void *ctx
);
1004 * Get an iterator for the set of acutal parameters
1006 exec_list_iterator
iterator()
1008 return actual_parameters
.iterator();
1012 * Get the name of the function being called.
1014 const char *callee_name() const
1016 return callee
->function_name();
1020 * Get the function signature bound to this function call
1022 ir_function_signature
*get_callee()
1028 * Set the function call target
1030 void set_callee(ir_function_signature
*sig
);
1033 * Generates an inline version of the function before @ir,
1034 * returning the return value of the function.
1036 ir_rvalue
*generate_inline(ir_instruction
*ir
);
1038 /* List of ir_rvalue of paramaters passed in this call. */
1039 exec_list actual_parameters
;
1041 /** Should this call only bind to a built-in function? */
1048 this->ir_type
= ir_type_call
;
1051 ir_function_signature
*callee
;
1056 * \name Jump-like IR instructions.
1058 * These include \c break, \c continue, \c return, and \c discard.
1061 class ir_jump
: public ir_instruction
{
1065 ir_type
= ir_type_unset
;
1069 class ir_return
: public ir_jump
{
1074 this->ir_type
= ir_type_return
;
1077 ir_return(ir_rvalue
*value
)
1080 this->ir_type
= ir_type_return
;
1083 virtual ir_return
*clone(void *mem_ctx
, struct hash_table
*) const;
1085 virtual ir_return
*as_return()
1090 ir_rvalue
*get_value() const
1095 virtual void accept(ir_visitor
*v
)
1100 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1107 * Jump instructions used inside loops
1109 * These include \c break and \c continue. The \c break within a loop is
1110 * different from the \c break within a switch-statement.
1112 * \sa ir_switch_jump
1114 class ir_loop_jump
: public ir_jump
{
1121 ir_loop_jump(jump_mode mode
)
1123 this->ir_type
= ir_type_loop_jump
;
1128 virtual ir_loop_jump
*clone(void *mem_ctx
, struct hash_table
*) const;
1130 virtual void accept(ir_visitor
*v
)
1135 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1137 bool is_break() const
1139 return mode
== jump_break
;
1142 bool is_continue() const
1144 return mode
== jump_continue
;
1147 /** Mode selector for the jump instruction. */
1148 enum jump_mode mode
;
1150 /** Loop containing this break instruction. */
1155 * IR instruction representing discard statements.
1157 class ir_discard
: public ir_jump
{
1161 this->ir_type
= ir_type_discard
;
1162 this->condition
= NULL
;
1165 ir_discard(ir_rvalue
*cond
)
1167 this->ir_type
= ir_type_discard
;
1168 this->condition
= cond
;
1171 virtual ir_discard
*clone(void *mem_ctx
, struct hash_table
*ht
) const;
1173 virtual void accept(ir_visitor
*v
)
1178 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1180 virtual ir_discard
*as_discard()
1185 ir_rvalue
*condition
;
1191 * Texture sampling opcodes used in ir_texture
1193 enum ir_texture_opcode
{
1194 ir_tex
, /**< Regular texture look-up */
1195 ir_txb
, /**< Texture look-up with LOD bias */
1196 ir_txl
, /**< Texture look-up with explicit LOD */
1197 ir_txd
, /**< Texture look-up with partial derivatvies */
1198 ir_txf
, /**< Texel fetch with explicit LOD */
1199 ir_txs
/**< Texture size */
1204 * IR instruction to sample a texture
1206 * The specific form of the IR instruction depends on the \c mode value
1207 * selected from \c ir_texture_opcodes. In the printed IR, these will
1210 * Texel offset (0 or an expression)
1211 * | Projection divisor
1212 * | | Shadow comparitor
1215 * (tex <type> <sampler> <coordinate> 0 1 ( ))
1216 * (txb <type> <sampler> <coordinate> 0 1 ( ) <bias>)
1217 * (txl <type> <sampler> <coordinate> 0 1 ( ) <lod>)
1218 * (txd <type> <sampler> <coordinate> 0 1 ( ) (dPdx dPdy))
1219 * (txf <type> <sampler> <coordinate> 0 <lod>)
1220 * (txs <type> <sampler> <lod>)
1222 class ir_texture
: public ir_rvalue
{
1224 ir_texture(enum ir_texture_opcode op
)
1225 : op(op
), projector(NULL
), shadow_comparitor(NULL
), offset(NULL
)
1227 this->ir_type
= ir_type_texture
;
1230 virtual ir_texture
*clone(void *mem_ctx
, struct hash_table
*) const;
1232 virtual ir_constant
*constant_expression_value();
1234 virtual void accept(ir_visitor
*v
)
1239 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1242 * Return a string representing the ir_texture_opcode.
1244 const char *opcode_string();
1246 /** Set the sampler and type. */
1247 void set_sampler(ir_dereference
*sampler
, const glsl_type
*type
);
1250 * Do a reverse-lookup to translate a string into an ir_texture_opcode.
1252 static ir_texture_opcode
get_opcode(const char *);
1254 enum ir_texture_opcode op
;
1256 /** Sampler to use for the texture access. */
1257 ir_dereference
*sampler
;
1259 /** Texture coordinate to sample */
1260 ir_rvalue
*coordinate
;
1263 * Value used for projective divide.
1265 * If there is no projective divide (the common case), this will be
1266 * \c NULL. Optimization passes should check for this to point to a constant
1267 * of 1.0 and replace that with \c NULL.
1269 ir_rvalue
*projector
;
1272 * Coordinate used for comparison on shadow look-ups.
1274 * If there is no shadow comparison, this will be \c NULL. For the
1275 * \c ir_txf opcode, this *must* be \c NULL.
1277 ir_rvalue
*shadow_comparitor
;
1279 /** Texel offset. */
1283 ir_rvalue
*lod
; /**< Floating point LOD */
1284 ir_rvalue
*bias
; /**< Floating point LOD bias */
1286 ir_rvalue
*dPdx
; /**< Partial derivative of coordinate wrt X */
1287 ir_rvalue
*dPdy
; /**< Partial derivative of coordinate wrt Y */
1293 struct ir_swizzle_mask
{
1300 * Number of components in the swizzle.
1302 unsigned num_components
:3;
1305 * Does the swizzle contain duplicate components?
1307 * L-value swizzles cannot contain duplicate components.
1309 unsigned has_duplicates
:1;
1313 class ir_swizzle
: public ir_rvalue
{
1315 ir_swizzle(ir_rvalue
*, unsigned x
, unsigned y
, unsigned z
, unsigned w
,
1318 ir_swizzle(ir_rvalue
*val
, const unsigned *components
, unsigned count
);
1320 ir_swizzle(ir_rvalue
*val
, ir_swizzle_mask mask
);
1322 virtual ir_swizzle
*clone(void *mem_ctx
, struct hash_table
*) const;
1324 virtual ir_constant
*constant_expression_value();
1326 virtual ir_swizzle
*as_swizzle()
1332 * Construct an ir_swizzle from the textual representation. Can fail.
1334 static ir_swizzle
*create(ir_rvalue
*, const char *, unsigned vector_length
);
1336 virtual void accept(ir_visitor
*v
)
1341 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1343 bool is_lvalue() const
1345 return val
->is_lvalue() && !mask
.has_duplicates
;
1349 * Get the variable that is ultimately referenced by an r-value
1351 virtual ir_variable
*variable_referenced() const;
1354 ir_swizzle_mask mask
;
1358 * Initialize the mask component of a swizzle
1360 * This is used by the \c ir_swizzle constructors.
1362 void init_mask(const unsigned *components
, unsigned count
);
1366 class ir_dereference
: public ir_rvalue
{
1368 virtual ir_dereference
*clone(void *mem_ctx
, struct hash_table
*) const = 0;
1370 virtual ir_dereference
*as_dereference()
1375 bool is_lvalue() const;
1378 * Get the variable that is ultimately referenced by an r-value
1380 virtual ir_variable
*variable_referenced() const = 0;
1384 class ir_dereference_variable
: public ir_dereference
{
1386 ir_dereference_variable(ir_variable
*var
);
1388 virtual ir_dereference_variable
*clone(void *mem_ctx
,
1389 struct hash_table
*) const;
1391 virtual ir_constant
*constant_expression_value();
1393 virtual ir_dereference_variable
*as_dereference_variable()
1399 * Get the variable that is ultimately referenced by an r-value
1401 virtual ir_variable
*variable_referenced() const
1406 virtual ir_variable
*whole_variable_referenced()
1408 /* ir_dereference_variable objects always dereference the entire
1409 * variable. However, if this dereference is dereferenced by anything
1410 * else, the complete deferefernce chain is not a whole-variable
1411 * dereference. This method should only be called on the top most
1412 * ir_rvalue in a dereference chain.
1417 virtual void accept(ir_visitor
*v
)
1422 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1425 * Object being dereferenced.
1431 class ir_dereference_array
: public ir_dereference
{
1433 ir_dereference_array(ir_rvalue
*value
, ir_rvalue
*array_index
);
1435 ir_dereference_array(ir_variable
*var
, ir_rvalue
*array_index
);
1437 virtual ir_dereference_array
*clone(void *mem_ctx
,
1438 struct hash_table
*) const;
1440 virtual ir_constant
*constant_expression_value();
1442 virtual ir_dereference_array
*as_dereference_array()
1448 * Get the variable that is ultimately referenced by an r-value
1450 virtual ir_variable
*variable_referenced() const
1452 return this->array
->variable_referenced();
1455 virtual void accept(ir_visitor
*v
)
1460 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1463 ir_rvalue
*array_index
;
1466 void set_array(ir_rvalue
*value
);
1470 class ir_dereference_record
: public ir_dereference
{
1472 ir_dereference_record(ir_rvalue
*value
, const char *field
);
1474 ir_dereference_record(ir_variable
*var
, const char *field
);
1476 virtual ir_dereference_record
*clone(void *mem_ctx
,
1477 struct hash_table
*) const;
1479 virtual ir_constant
*constant_expression_value();
1482 * Get the variable that is ultimately referenced by an r-value
1484 virtual ir_variable
*variable_referenced() const
1486 return this->record
->variable_referenced();
1489 virtual void accept(ir_visitor
*v
)
1494 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1502 * Data stored in an ir_constant
1504 union ir_constant_data
{
1512 class ir_constant
: public ir_rvalue
{
1514 ir_constant(const struct glsl_type
*type
, const ir_constant_data
*data
);
1515 ir_constant(bool b
);
1516 ir_constant(unsigned int u
);
1518 ir_constant(float f
);
1521 * Construct an ir_constant from a list of ir_constant values
1523 ir_constant(const struct glsl_type
*type
, exec_list
*values
);
1526 * Construct an ir_constant from a scalar component of another ir_constant
1528 * The new \c ir_constant inherits the type of the component from the
1532 * In the case of a matrix constant, the new constant is a scalar, \b not
1535 ir_constant(const ir_constant
*c
, unsigned i
);
1538 * Return a new ir_constant of the specified type containing all zeros.
1540 static ir_constant
*zero(void *mem_ctx
, const glsl_type
*type
);
1542 virtual ir_constant
*clone(void *mem_ctx
, struct hash_table
*) const;
1544 virtual ir_constant
*constant_expression_value();
1546 virtual ir_constant
*as_constant()
1551 virtual void accept(ir_visitor
*v
)
1556 virtual ir_visitor_status
accept(ir_hierarchical_visitor
*);
1559 * Get a particular component of a constant as a specific type
1561 * This is useful, for example, to get a value from an integer constant
1562 * as a float or bool. This appears frequently when constructors are
1563 * called with all constant parameters.
1566 bool get_bool_component(unsigned i
) const;
1567 float get_float_component(unsigned i
) const;
1568 int get_int_component(unsigned i
) const;
1569 unsigned get_uint_component(unsigned i
) const;
1572 ir_constant
*get_array_element(unsigned i
) const;
1574 ir_constant
*get_record_field(const char *name
);
1577 * Determine whether a constant has the same value as another constant
1579 * \sa ir_constant::is_zero, ir_constant::is_one,
1580 * ir_constant::is_negative_one
1582 bool has_value(const ir_constant
*) const;
1584 virtual bool is_zero() const;
1585 virtual bool is_one() const;
1586 virtual bool is_negative_one() const;
1589 * Value of the constant.
1591 * The field used to back the values supplied by the constant is determined
1592 * by the type associated with the \c ir_instruction. Constants may be
1593 * scalars, vectors, or matrices.
1595 union ir_constant_data value
;
1597 /* Array elements */
1598 ir_constant
**array_elements
;
1600 /* Structure fields */
1601 exec_list components
;
1605 * Parameterless constructor only used by the clone method
1613 * Apply a visitor to each IR node in a list
1616 visit_exec_list(exec_list
*list
, ir_visitor
*visitor
);
1619 * Validate invariants on each IR node in a list
1621 void validate_ir_tree(exec_list
*instructions
);
1623 struct _mesa_glsl_parse_state
;
1624 struct gl_shader_program
;
1627 * Detect whether an unlinked shader contains static recursion
1629 * If the list of instructions is determined to contain static recursion,
1630 * \c _mesa_glsl_error will be called to emit error messages for each function
1631 * that is in the recursion cycle.
1634 detect_recursion_unlinked(struct _mesa_glsl_parse_state
*state
,
1635 exec_list
*instructions
);
1638 * Detect whether a linked shader contains static recursion
1640 * If the list of instructions is determined to contain static recursion,
1641 * \c link_error_printf will be called to emit error messages for each function
1642 * that is in the recursion cycle. In addition,
1643 * \c gl_shader_program::LinkStatus will be set to false.
1646 detect_recursion_linked(struct gl_shader_program
*prog
,
1647 exec_list
*instructions
);
1650 * Make a clone of each IR instruction in a list
1652 * \param in List of IR instructions that are to be cloned
1653 * \param out List to hold the cloned instructions
1656 clone_ir_list(void *mem_ctx
, exec_list
*out
, const exec_list
*in
);
1659 _mesa_glsl_initialize_variables(exec_list
*instructions
,
1660 struct _mesa_glsl_parse_state
*state
);
1663 _mesa_glsl_initialize_functions(_mesa_glsl_parse_state
*state
);
1666 _mesa_glsl_release_functions(void);
1669 reparent_ir(exec_list
*list
, void *mem_ctx
);
1671 struct glsl_symbol_table
;
1674 import_prototypes(const exec_list
*source
, exec_list
*dest
,
1675 struct glsl_symbol_table
*symbols
, void *mem_ctx
);
1678 ir_has_call(ir_instruction
*ir
);
1681 do_set_program_inouts(exec_list
*instructions
, struct gl_program
*prog
,
1682 bool is_fragment_shader
);
1685 prototype_string(const glsl_type
*return_type
, const char *name
,
1686 exec_list
*parameters
);