#define ARRAY_SIZE(x) (sizeof(x) / sizeof(x[0]))
#endif
+/**
+ * \defgroup IR Intermediate representation nodes
+ *
+ * @{
+ */
+
+/**
+ * Class tags
+ *
+ * Each concrete class derived from \c ir_instruction has a value in this
+ * enumerant. The value for the type is stored in \c ir_instruction::ir_type
+ * by the constructor. While using type tags is not very C++, it is extremely
+ * convenient. For example, during debugging you can simply inspect
+ * \c ir_instruction::ir_type to find out the actual type of the object.
+ *
+ * In addition, it is possible to use a switch-statement based on \c
+ * \c ir_instruction::ir_type to select different behavior for different object
+ * types. For functions that have only slight differences for several object
+ * types, this allows writing very straightforward, readable code.
+ */
enum ir_node_type {
+ /**
+ * Zero is unused so that the IR validator can detect cases where
+ * \c ir_instruction::ir_type has not been initialized.
+ */
ir_type_unset,
ir_type_variable,
ir_type_assignment,
};
+/**
+ * Variable storage classes
+ */
enum ir_variable_mode {
- ir_var_auto = 0,
- ir_var_uniform,
+ ir_var_auto = 0, /**< Function local variables and globals. */
+ ir_var_uniform, /**< Variable declared as a uniform. */
ir_var_in,
ir_var_out,
ir_var_inout,
*/
unsigned component_slots() const;
+ /**
+ * Delcared name of the variable
+ */
const char *name;
/**
*/
unsigned max_array_access;
+ /**
+ * Is the variable read-only?
+ *
+ * This is set for variables declared as \c const, shader inputs,
+ * and uniforms.
+ */
unsigned read_only:1;
unsigned centroid:1;
unsigned invariant:1;
+ /**
+ * Storage class of the variable.
+ *
+ * \sa ir_variable_mode
+ */
unsigned mode:3;
+
+ /**
+ * Interpolation mode for shader inputs / outputs
+ *
+ * \sa ir_variable_interpolation
+ */
unsigned interpolation:2;
/**
*/
unsigned array_lvalue:1;
- /* ARB_fragment_coord_conventions */
+ /**
+ * \name ARB_fragment_coord_conventions
+ * @{
+ */
unsigned origin_upper_left:1;
unsigned pixel_center_integer:1;
+ /*@}*/
+
+ /**
+ * Was the location explicitly set in the shader?
+ *
+ * If the location is explicitly set in the shader, it \b cannot be changed
+ * by the linker or by the API (e.g., calls to \c glBindAttribLocation have
+ * no effect).
+ */
+ unsigned explicit_location:1;
/**
* Storage location of the base of this variable
*/
const char *name;
- /** Whether or not this function has a signature that is a built-in. */
- bool has_builtin_signature();
+ /** Whether or not this function has a signature that isn't a built-in. */
+ bool has_user_signature();
/**
* List of ir_function_signature for each overloaded function with this name.
* For non-vector types in the LHS, this field will be zero. For vector
* types, a bit will be set for each component that is written. Note that
* for \c vec2 and \c vec3 types only the lower bits will ever be set.
+ *
+ * A partially-set write mask means that each enabled channel gets
+ * the value from a consecutive channel of the rhs. For example,
+ * to write just .xyw of gl_FrontColor with color:
+ *
+ * (assign (constant bool (1)) (xyw)
+ * (var_ref gl_FragColor)
+ * (swiz xyw (var_ref color)))
*/
unsigned write_mask:4;
};
ir_unop_ceil,
ir_unop_floor,
ir_unop_fract,
+ ir_unop_round_even,
/*@}*/
/**
ir_binop_mod,
/**
- * \name Binary comparison operators
+ * \name Binary comparison operators which return a boolean vector.
+ * The type of both operands must be equal.
*/
/*@{*/
ir_binop_less,
virtual ir_expression *clone(void *mem_ctx, struct hash_table *ht) const;
+ /**
+ * Attempt to constant-fold the expression
+ *
+ * If the expression cannot be constant folded, this method will return
+ * \c NULL.
+ */
virtual ir_constant *constant_expression_value();
+ /**
+ * Determine the number of operands used by an expression
+ */
static unsigned int get_num_operands(ir_expression_operation);
+
+ /**
+ * Determine the number of operands used by an expression
+ */
unsigned int get_num_operands() const
{
return get_num_operands(operation);
return callee->function_name();
}
+ /**
+ * Get the function signature bound to this function call
+ */
ir_function_signature *get_callee()
{
return callee;
* 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_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_constant(void);
};
+/*@}*/
+
+/**
+ * Apply a visitor to each IR node in a list
+ */
void
visit_exec_list(exec_list *list, ir_visitor *visitor);
+/**
+ * Validate invariants on each IR node in a list
+ */
void validate_ir_tree(exec_list *instructions);
/**
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