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Diffstat (limited to 'src/glsl/ir.h')
| -rw-r--r-- | src/glsl/ir.h | 1178 |
1 files changed, 1178 insertions, 0 deletions
diff --git a/src/glsl/ir.h b/src/glsl/ir.h new file mode 100644 index 00000000000..3d2c7ff5cf5 --- /dev/null +++ b/src/glsl/ir.h @@ -0,0 +1,1178 @@ +/* -*- c++ -*- */ +/* + * Copyright © 2010 Intel Corporation + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice (including the next + * paragraph) shall be included in all copies or substantial portions of the + * Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING + * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER + * DEALINGS IN THE SOFTWARE. + */ + +#pragma once +#ifndef IR_H +#define IR_H + +#include <cstdio> +#include <cstdlib> + +extern "C" { +#include <talloc.h> +} + +#include "list.h" +#include "ir_visitor.h" +#include "ir_hierarchical_visitor.h" + +#ifndef ARRAY_SIZE +#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0])) +#endif + +struct ir_program { + void *bong_hits; +}; + +/** + * Base class of all IR instructions + */ +class ir_instruction : public exec_node { +public: + const struct glsl_type *type; + + class ir_constant *constant_expression_value(); + + /** ir_print_visitor helper for debugging. */ + void print(void) const; + + virtual void accept(ir_visitor *) = 0; + virtual ir_visitor_status accept(ir_hierarchical_visitor *) = 0; + virtual ir_instruction *clone(struct hash_table *ht) const = 0; + + /** + * \name IR instruction downcast functions + * + * These functions either cast the object to a derived class or return + * \c NULL if the object's type does not match the specified derived class. + * Additional downcast functions will be added as needed. + */ + /*@{*/ + virtual class ir_variable * as_variable() { return NULL; } + virtual class ir_function * as_function() { return NULL; } + virtual class ir_dereference * as_dereference() { return NULL; } + virtual class ir_dereference_array * as_dereference_array() { return NULL; } + virtual class ir_rvalue * as_rvalue() { return NULL; } + virtual class ir_loop * as_loop() { return NULL; } + virtual class ir_assignment * as_assignment() { return NULL; } + virtual class ir_call * as_call() { return NULL; } + virtual class ir_return * as_return() { return NULL; } + virtual class ir_if * as_if() { return NULL; } + virtual class ir_swizzle * as_swizzle() { return NULL; } + virtual class ir_constant * as_constant() { return NULL; } + /*@}*/ + +protected: + ir_instruction() + { + /* empty */ + } +}; + + +class ir_rvalue : public ir_instruction { +public: + virtual ir_rvalue * as_rvalue() + { + return this; + } + + virtual bool is_lvalue() + { + return false; + } + + /** + * Get the variable that is ultimately referenced by an r-value + */ + virtual ir_variable *variable_referenced() + { + return NULL; + } + + + /** + * If an r-value is a reference to a whole variable, get that variable + * + * \return + * Pointer to a variable that is completely dereferenced by the r-value. If + * the r-value is not a dereference or the dereference does not access the + * entire variable (i.e., it's just one array element, struct field), \c NULL + * is returned. + */ + virtual ir_variable *whole_variable_referenced() + { + return NULL; + } + +protected: + ir_rvalue() + { + /* empty */ + } +}; + + +enum ir_variable_mode { + ir_var_auto = 0, + ir_var_uniform, + ir_var_in, + ir_var_out, + ir_var_inout +}; + +enum ir_variable_interpolation { + ir_var_smooth = 0, + ir_var_flat, + ir_var_noperspective +}; + + +class ir_variable : public ir_instruction { +public: + ir_variable(const struct glsl_type *, const char *); + + virtual ir_instruction *clone(struct hash_table *ht) const; + + virtual ir_variable *as_variable() + { + return this; + } + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + + /** + * Get the string value for the interpolation qualifier + * + * \return + * If none of \c shader_in or \c shader_out is set, an empty string will + * be returned. Otherwise the string that would be used in a shader to + * specify \c mode will be returned. + */ + const char *interpolation_string() const; + + /** + * Calculate the number of slots required to hold this variable + * + * This is used to determine how many uniform or varying locations a variable + * occupies. The count is in units of floating point components. + */ + unsigned component_slots() const; + + const char *name; + + /** + * Highest element accessed with a constant expression array index + * + * Not used for non-array variables. + */ + unsigned max_array_access; + + unsigned read_only:1; + unsigned centroid:1; + unsigned invariant:1; + /** If the variable is initialized outside of the scope of the shader */ + unsigned shader_in:1; + /** + * If the variable value is later used outside of the scope of the shader. + */ + unsigned shader_out:1; + + unsigned mode:3; + unsigned interpolation:2; + + /** + * Flag that the whole array is assignable + * + * In GLSL 1.20 and later whole arrays are assignable (and comparable for + * equality). This flag enables this behavior. + */ + unsigned array_lvalue:1; + + /** + * Storage location of the base of this variable + * + * The precise meaning of this field depends on the nature of the variable. + * + * - Vertex shader input: one of the values from \c gl_vert_attrib. + * - Vertex shader output: one of the values from \c gl_vert_result. + * - Fragment shader input: one of the values from \c gl_frag_attrib. + * - Fragment shader output: one of the values from \c gl_frag_result. + * - Uniforms: Per-stage uniform slot number. + * - Other: This field is not currently used. + * + * If the variable is a uniform, shader input, or shader output, and the + * slot has not been assigned, the value will be -1. + */ + int location; + + /** + * Emit a warning if this variable is accessed. + */ + const char *warn_extension; + + /** + * Value assigned in the initializer of a variable declared "const" + */ + ir_constant *constant_value; +}; + + +/*@{*/ +/** + * The representation of a function instance; may be the full definition or + * simply a prototype. + */ +class ir_function_signature : public ir_instruction { + /* An ir_function_signature will be part of the list of signatures in + * an ir_function. + */ +public: + ir_function_signature(const glsl_type *return_type); + + virtual ir_instruction *clone(struct hash_table *ht) const; + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + /** + * Get the name of the function for which this is a signature + */ + const char *function_name() const; + + /** + * Check whether the qualifiers match between this signature's parameters + * and the supplied parameter list. If not, returns the name of the first + * parameter with mismatched qualifiers (for use in error messages). + */ + const char *qualifiers_match(exec_list *params); + + /** + * Replace the current parameter list with the given one. This is useful + * if the current information came from a prototype, and either has invalid + * or missing parameter names. + */ + void replace_parameters(exec_list *new_params); + + /** + * Function return type. + * + * \note This discards the optional precision qualifier. + */ + const struct glsl_type *return_type; + + /** + * List of ir_variable of function parameters. + * + * This represents the storage. The paramaters passed in a particular + * call will be in ir_call::actual_paramaters. + */ + struct exec_list parameters; + + /** Whether or not this function has a body (which may be empty). */ + unsigned is_defined:1; + + /** Body of instructions in the function. */ + struct exec_list body; + +private: + /** Function of which this signature is one overload. */ + class ir_function *function; + + friend class ir_function; +}; + + +/** + * Header for tracking multiple overloaded functions with the same name. + * Contains a list of ir_function_signatures representing each of the + * actual functions. + */ +class ir_function : public ir_instruction { +public: + ir_function(const char *name); + + virtual ir_instruction *clone(struct hash_table *ht) const; + + virtual ir_function *as_function() + { + return this; + } + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + void add_signature(ir_function_signature *sig) + { + sig->function = this; + signatures.push_tail(sig); + } + + /** + * Get an iterator for the set of function signatures + */ + exec_list_iterator iterator() + { + return signatures.iterator(); + } + + /** + * Find a signature that matches a set of actual parameters, taking implicit + * conversions into account. + */ + const ir_function_signature *matching_signature(exec_list *actual_param); + + /** + * Find a signature that exactly matches a set of actual parameters without + * any implicit type conversions. + */ + ir_function_signature *exact_matching_signature(exec_list *actual_ps); + + /** + * Name of the function. + */ + const char *name; + +private: + /** + * List of ir_function_signature for each overloaded function with this name. + */ + struct exec_list signatures; +}; + +inline const char *ir_function_signature::function_name() const +{ + return function->name; +} +/*@}*/ + + +/** + * IR instruction representing high-level if-statements + */ +class ir_if : public ir_instruction { +public: + ir_if(ir_rvalue *condition) + : condition(condition) + { + /* empty */ + } + + virtual ir_instruction *clone(struct hash_table *ht) const; + + virtual ir_if *as_if() + { + return this; + } + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + ir_rvalue *condition; + /** List of ir_instruction for the body of the then branch */ + exec_list then_instructions; + /** List of ir_instruction for the body of the else branch */ + exec_list else_instructions; +}; + + +/** + * IR instruction representing a high-level loop structure. + */ +class ir_loop : public ir_instruction { +public: + ir_loop() : from(NULL), to(NULL), increment(NULL), counter(NULL) + { + /* empty */ + } + + virtual ir_instruction *clone(struct hash_table *ht) const; + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + virtual ir_loop *as_loop() + { + return this; + } + + /** + * Get an iterator for the instructions of the loop body + */ + exec_list_iterator iterator() + { + return body_instructions.iterator(); + } + + /** List of ir_instruction that make up the body of the loop. */ + exec_list body_instructions; + + /** + * \name Loop counter and controls + */ + /*@{*/ + ir_rvalue *from; + ir_rvalue *to; + ir_rvalue *increment; + ir_variable *counter; + /*@}*/ +}; + + +class ir_assignment : public ir_rvalue { +public: + ir_assignment(ir_rvalue *lhs, ir_rvalue *rhs, ir_rvalue *condition); + + virtual ir_instruction *clone(struct hash_table *ht) const; + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + virtual ir_assignment * as_assignment() + { + return this; + } + + /** + * Left-hand side of the assignment. + */ + ir_rvalue *lhs; + + /** + * Value being assigned + */ + ir_rvalue *rhs; + + /** + * Optional condition for the assignment. + */ + ir_rvalue *condition; +}; + +/* Update ir_expression::num_operands() and operator_strs when + * updating this list. + */ +enum ir_expression_operation { + ir_unop_bit_not, + ir_unop_logic_not, + ir_unop_neg, + ir_unop_abs, + ir_unop_sign, + ir_unop_rcp, + ir_unop_rsq, + ir_unop_sqrt, + ir_unop_exp, + ir_unop_log, + ir_unop_exp2, + ir_unop_log2, + ir_unop_f2i, /**< Float-to-integer conversion. */ + ir_unop_i2f, /**< Integer-to-float conversion. */ + ir_unop_f2b, /**< Float-to-boolean conversion */ + ir_unop_b2f, /**< Boolean-to-float conversion */ + ir_unop_i2b, /**< int-to-boolean conversion */ + ir_unop_b2i, /**< Boolean-to-int conversion */ + ir_unop_u2f, /**< Unsigned-to-float conversion. */ + + /** + * \name Unary floating-point rounding operations. + */ + /*@{*/ + ir_unop_trunc, + ir_unop_ceil, + ir_unop_floor, + /*@}*/ + + /** + * \name Trigonometric operations. + */ + /*@{*/ + ir_unop_sin, + ir_unop_cos, + /*@}*/ + + /** + * \name Partial derivatives. + */ + /*@{*/ + ir_unop_dFdx, + ir_unop_dFdy, + /*@}*/ + + ir_binop_add, + ir_binop_sub, + ir_binop_mul, + ir_binop_div, + ir_binop_mod, + + /** + * \name Binary comparison operators + */ + /*@{*/ + ir_binop_less, + ir_binop_greater, + ir_binop_lequal, + ir_binop_gequal, + ir_binop_equal, + ir_binop_nequal, + /*@}*/ + + /** + * \name Bit-wise binary operations. + */ + /*@{*/ + ir_binop_lshift, + ir_binop_rshift, + ir_binop_bit_and, + ir_binop_bit_xor, + ir_binop_bit_or, + /*@}*/ + + ir_binop_logic_and, + ir_binop_logic_xor, + ir_binop_logic_or, + + ir_binop_dot, + ir_binop_min, + ir_binop_max, + + ir_binop_pow +}; + +class ir_expression : public ir_rvalue { +public: + ir_expression(int op, const struct glsl_type *type, + ir_rvalue *, ir_rvalue *); + + virtual ir_instruction *clone(struct hash_table *ht) const; + + static unsigned int get_num_operands(ir_expression_operation); + unsigned int get_num_operands() const + { + return get_num_operands(operation); + } + + /** + * Return a string representing this expression's operator. + */ + const char *operator_string(); + + /** + * Do a reverse-lookup to translate the given string into an operator. + */ + static ir_expression_operation get_operator(const char *); + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + ir_expression_operation operation; + ir_rvalue *operands[2]; +}; + + +/** + * IR instruction representing a function call + */ +class ir_call : public ir_rvalue { +public: + ir_call(const ir_function_signature *callee, exec_list *actual_parameters) + : callee(callee) + { + assert(callee->return_type != NULL); + type = callee->return_type; + actual_parameters->move_nodes_to(& this->actual_parameters); + } + + virtual ir_instruction *clone(struct hash_table *ht) const; + + virtual ir_call *as_call() + { + return this; + } + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + /** + * Get a generic ir_call object when an error occurs + * + * Any allocation will be performed with 'ctx' as talloc owner. + */ + static ir_call *get_error_instruction(void *ctx); + + /** + * Get an iterator for the set of acutal parameters + */ + exec_list_iterator iterator() + { + return actual_parameters.iterator(); + } + + /** + * Get the name of the function being called. + */ + const char *callee_name() const + { + return callee->function_name(); + } + + const ir_function_signature *get_callee() + { + return callee; + } + + /** + * Generates an inline version of the function before @ir, + * returning the return value of the function. + */ + ir_rvalue *generate_inline(ir_instruction *ir); + +private: + ir_call() + : callee(NULL) + { + /* empty */ + } + + const ir_function_signature *callee; + + /* List of ir_rvalue of paramaters passed in this call. */ + exec_list actual_parameters; +}; + + +/** + * \name Jump-like IR instructions. + * + * These include \c break, \c continue, \c return, and \c discard. + */ +/*@{*/ +class ir_jump : public ir_instruction { +protected: + ir_jump() + { + /* empty */ + } +}; + +class ir_return : public ir_jump { +public: + ir_return() + : value(NULL) + { + /* empty */ + } + + ir_return(ir_rvalue *value) + : value(value) + { + /* empty */ + } + + virtual ir_instruction *clone(struct hash_table *) const; + + virtual ir_return *as_return() + { + return this; + } + + ir_rvalue *get_value() const + { + return value; + } + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + ir_rvalue *value; +}; + + +/** + * Jump instructions used inside loops + * + * These include \c break and \c continue. The \c break within a loop is + * different from the \c break within a switch-statement. + * + * \sa ir_switch_jump + */ +class ir_loop_jump : public ir_jump { +public: + enum jump_mode { + jump_break, + jump_continue + }; + + ir_loop_jump(jump_mode mode) + { + this->mode = mode; + this->loop = loop; + } + + virtual ir_instruction *clone(struct hash_table *) const; + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + bool is_break() const + { + return mode == jump_break; + } + + bool is_continue() const + { + return mode == jump_continue; + } + + /** Mode selector for the jump instruction. */ + enum jump_mode mode; +private: + /** Loop containing this break instruction. */ + ir_loop *loop; +}; +/*@}*/ + + +/** + * Texture sampling opcodes used in ir_texture + */ +enum ir_texture_opcode { + ir_tex, /* Regular texture look-up */ + ir_txb, /* Texture look-up with LOD bias */ + ir_txl, /* Texture look-up with explicit LOD */ + ir_txd, /* Texture look-up with partial derivatvies */ + ir_txf /* Texel fetch with explicit LOD */ +}; + + +/** + * IR instruction to sample a texture + * + * The specific form of the IR instruction depends on the \c mode value + * selected from \c ir_texture_opcodes. In the printed IR, these will + * appear as: + * + * Texel offset + * | Projection divisor + * | | Shadow comparitor + * | | | + * v v v + * (tex (sampler) (coordinate) (0 0 0) (1) ( )) + * (txb (sampler) (coordinate) (0 0 0) (1) ( ) (bias)) + * (txl (sampler) (coordinate) (0 0 0) (1) ( ) (lod)) + * (txd (sampler) (coordinate) (0 0 0) (1) ( ) (dPdx dPdy)) + * (txf (sampler) (coordinate) (0 0 0) (lod)) + */ +class ir_texture : public ir_rvalue { +public: + ir_texture(enum ir_texture_opcode op) + : op(op), projector(NULL), shadow_comparitor(NULL) + { + /* empty */ + } + + virtual ir_instruction *clone(struct hash_table *) const; + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + /** + * Return a string representing the ir_texture_opcode. + */ + const char *opcode_string(); + + /** Set the sampler and infer the type. */ + void set_sampler(ir_dereference *sampler); + + /** + * Do a reverse-lookup to translate a string into an ir_texture_opcode. + */ + static ir_texture_opcode get_opcode(const char *); + + enum ir_texture_opcode op; + + /** Sampler to use for the texture access. */ + ir_dereference *sampler; + + /** Texture coordinate to sample */ + ir_rvalue *coordinate; + + /** + * Value used for projective divide. + * + * If there is no projective divide (the common case), this will be + * \c NULL. Optimization passes should check for this to point to a constant + * of 1.0 and replace that with \c NULL. + */ + ir_rvalue *projector; + + /** + * Coordinate used for comparison on shadow look-ups. + * + * If there is no shadow comparison, this will be \c NULL. For the + * \c ir_txf opcode, this *must* be \c NULL. + */ + ir_rvalue *shadow_comparitor; + + /** Explicit texel offsets. */ + signed char offsets[3]; + + union { + ir_rvalue *lod; /**< Floating point LOD */ + ir_rvalue *bias; /**< Floating point LOD bias */ + struct { + ir_rvalue *dPdx; /**< Partial derivative of coordinate wrt X */ + ir_rvalue *dPdy; /**< Partial derivative of coordinate wrt Y */ + } grad; + } lod_info; +}; + + +struct ir_swizzle_mask { + unsigned x:2; + unsigned y:2; + unsigned z:2; + unsigned w:2; + + /** + * Number of components in the swizzle. + */ + unsigned num_components:3; + + /** + * Does the swizzle contain duplicate components? + * + * L-value swizzles cannot contain duplicate components. + */ + unsigned has_duplicates:1; +}; + + +class ir_swizzle : public ir_rvalue { +public: + ir_swizzle(ir_rvalue *, unsigned x, unsigned y, unsigned z, unsigned w, + unsigned count); + ir_swizzle(ir_rvalue *val, ir_swizzle_mask mask); + + virtual ir_instruction *clone(struct hash_table *) const; + + virtual ir_swizzle *as_swizzle() + { + return this; + } + + /** + * Construct an ir_swizzle from the textual representation. Can fail. + */ + static ir_swizzle *create(ir_rvalue *, const char *, unsigned vector_length); + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + bool is_lvalue() + { + return val->is_lvalue() && !mask.has_duplicates; + } + + /** + * Get the variable that is ultimately referenced by an r-value + */ + virtual ir_variable *variable_referenced(); + + ir_rvalue *val; + ir_swizzle_mask mask; +}; + + +class ir_dereference : public ir_rvalue { +public: + virtual ir_dereference *as_dereference() + { + return this; + } + + bool is_lvalue(); + + /** + * Get the variable that is ultimately referenced by an r-value + */ + virtual ir_variable *variable_referenced() = 0; +}; + + +class ir_dereference_variable : public ir_dereference { +public: + ir_dereference_variable(ir_variable *var); + + virtual ir_instruction *clone(struct hash_table *) const; + + /** + * Get the variable that is ultimately referenced by an r-value + */ + virtual ir_variable *variable_referenced() + { + return this->var; + } + + virtual ir_variable *whole_variable_referenced() + { + /* ir_dereference_variable objects always dereference the entire + * variable. However, if this dereference is dereferenced by anything + * else, the complete deferefernce chain is not a whole-variable + * dereference. This method should only be called on the top most + * ir_rvalue in a dereference chain. + */ + return this->var; + } + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + /** + * Object being dereferenced. + */ + ir_variable *var; +}; + + +class ir_dereference_array : public ir_dereference { +public: + ir_dereference_array(ir_rvalue *value, ir_rvalue *array_index); + + ir_dereference_array(ir_variable *var, ir_rvalue *array_index); + + virtual ir_instruction *clone(struct hash_table *) const; + + virtual ir_dereference_array *as_dereference_array() + { + return this; + } + + /** + * Get the variable that is ultimately referenced by an r-value + */ + virtual ir_variable *variable_referenced() + { + return this->array->variable_referenced(); + } + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + ir_rvalue *array; + ir_rvalue *array_index; + +private: + void set_array(ir_rvalue *value); +}; + + +class ir_dereference_record : public ir_dereference { +public: + ir_dereference_record(ir_rvalue *value, const char *field); + + ir_dereference_record(ir_variable *var, const char *field); + + virtual ir_instruction *clone(struct hash_table *) const; + + /** + * Get the variable that is ultimately referenced by an r-value + */ + virtual ir_variable *variable_referenced() + { + return this->record->variable_referenced(); + } + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + ir_rvalue *record; + const char *field; +}; + + +/** + * Data stored in an ir_constant + */ +union ir_constant_data { + unsigned u[16]; + int i[16]; + float f[16]; + bool b[16]; +}; + + +class ir_constant : public ir_rvalue { +public: + ir_constant(const struct glsl_type *type, const ir_constant_data *data); + ir_constant(bool b); + ir_constant(unsigned int u); + ir_constant(int i); + ir_constant(float f); + + /** + * Construct an ir_constant from a list of ir_constant values + */ + ir_constant(const struct glsl_type *type, exec_list *values); + + /** + * Construct an ir_constant from a scalar component of another ir_constant + * + * The new \c ir_constant inherits the type of the component from the + * source constant. + * + * \note + * In the case of a matrix constant, the new constant is a scalar, \b not + * a vector. + */ + ir_constant(const ir_constant *c, unsigned i); + + virtual ir_instruction *clone(struct hash_table *) const; + + virtual ir_constant *as_constant() + { + return this; + } + + virtual void accept(ir_visitor *v) + { + v->visit(this); + } + + virtual ir_visitor_status accept(ir_hierarchical_visitor *); + + /** + * Get a particular component of a constant as a specific type + * + * This is useful, for example, to get a value from an integer constant + * as a float or bool. This appears frequently when constructors are + * called with all constant parameters. + */ + /*@{*/ + bool get_bool_component(unsigned i) const; + float get_float_component(unsigned i) const; + int get_int_component(unsigned i) const; + unsigned get_uint_component(unsigned i) const; + /*@}*/ + + ir_constant *get_record_field(const char *name); + + /** + * Determine whether a constant has the same value as another constant + */ + bool has_value(const ir_constant *) const; + + /** + * Value of the constant. + * + * The field used to back the values supplied by the constant is determined + * by the type associated with the \c ir_instruction. Constants may be + * scalars, vectors, or matrices. + */ + union ir_constant_data value; + + exec_list components; + +private: + /** + * Parameterless constructor only used by the clone method + */ + ir_constant(void); +}; + +void +visit_exec_list(exec_list *list, ir_visitor *visitor); + +void validate_ir_tree(exec_list *instructions); + +extern void +_mesa_glsl_initialize_variables(exec_list *instructions, + struct _mesa_glsl_parse_state *state); + +extern void +_mesa_glsl_initialize_functions(exec_list *instructions, + struct _mesa_glsl_parse_state *state); + +#endif /* IR_H */ |