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/* SPDX-License-Identifier: GPL-2.0-or-later */
#pragma once
/** \file
* \ingroup fn
*
* The signature of a multi-function contains the functions name and expected parameters. New
* signatures should be build using the #MFSignatureBuilder class.
*/
#include "FN_multi_function_param_type.hh"
#include "BLI_vector.hh"
namespace blender::fn {
struct MFSignature {
/**
* The name should be statically allocated so that it lives longer than this signature. This is
* used instead of an #std::string because of the overhead when many functions are created.
* If the name of the function has to be more dynamic for debugging purposes, override
* #MultiFunction::debug_name() instead. Then the dynamic name will only be computed when it is
* actually needed.
*/
const char *function_name;
Vector<const char *> param_names;
Vector<MFParamType> param_types;
Vector<int> param_data_indices;
bool depends_on_context = false;
/**
* Number of elements of each of these types that has to be passed into the multi-function as an
* input or output.
*/
int span_num = 0;
int virtual_array_num = 0;
int virtual_vector_array_num = 0;
int vector_array_num = 0;
int data_index(int param_index) const
{
return param_data_indices[param_index];
}
};
class MFSignatureBuilder {
private:
MFSignature signature_;
public:
MFSignatureBuilder(const char *function_name)
{
signature_.function_name = function_name;
}
MFSignature build() const
{
return std::move(signature_);
}
/* Input Parameter Types */
template<typename T> void single_input(const char *name)
{
this->single_input(name, CPPType::get<T>());
}
void single_input(const char *name, const CPPType &type)
{
this->input(name, MFDataType::ForSingle(type));
}
template<typename T> void vector_input(const char *name)
{
this->vector_input(name, CPPType::get<T>());
}
void vector_input(const char *name, const CPPType &base_type)
{
this->input(name, MFDataType::ForVector(base_type));
}
void input(const char *name, MFDataType data_type)
{
signature_.param_names.append(name);
signature_.param_types.append(MFParamType(MFParamType::Input, data_type));
switch (data_type.category()) {
case MFDataType::Single:
signature_.param_data_indices.append(signature_.virtual_array_num++);
break;
case MFDataType::Vector:
signature_.param_data_indices.append(signature_.virtual_vector_array_num++);
break;
}
}
/* Output Parameter Types */
template<typename T> void single_output(const char *name)
{
this->single_output(name, CPPType::get<T>());
}
void single_output(const char *name, const CPPType &type)
{
this->output(name, MFDataType::ForSingle(type));
}
template<typename T> void vector_output(const char *name)
{
this->vector_output(name, CPPType::get<T>());
}
void vector_output(const char *name, const CPPType &base_type)
{
this->output(name, MFDataType::ForVector(base_type));
}
void output(const char *name, MFDataType data_type)
{
signature_.param_names.append(name);
signature_.param_types.append(MFParamType(MFParamType::Output, data_type));
switch (data_type.category()) {
case MFDataType::Single:
signature_.param_data_indices.append(signature_.span_num++);
break;
case MFDataType::Vector:
signature_.param_data_indices.append(signature_.vector_array_num++);
break;
}
}
/* Mutable Parameter Types */
template<typename T> void single_mutable(const char *name)
{
this->single_mutable(name, CPPType::get<T>());
}
void single_mutable(const char *name, const CPPType &type)
{
this->mutable_(name, MFDataType::ForSingle(type));
}
template<typename T> void vector_mutable(const char *name)
{
this->vector_mutable(name, CPPType::get<T>());
}
void vector_mutable(const char *name, const CPPType &base_type)
{
this->mutable_(name, MFDataType::ForVector(base_type));
}
void mutable_(const char *name, MFDataType data_type)
{
signature_.param_names.append(name);
signature_.param_types.append(MFParamType(MFParamType::Mutable, data_type));
switch (data_type.category()) {
case MFDataType::Single:
signature_.param_data_indices.append(signature_.span_num++);
break;
case MFDataType::Vector:
signature_.param_data_indices.append(signature_.vector_array_num++);
break;
}
}
void add(const char *name, const MFParamType ¶m_type)
{
switch (param_type.interface_type()) {
case MFParamType::Input:
this->input(name, param_type.data_type());
break;
case MFParamType::Mutable:
this->mutable_(name, param_type.data_type());
break;
case MFParamType::Output:
this->output(name, param_type.data_type());
break;
}
}
template<MFParamCategory Category, typename T>
void add(MFParamTag<Category, T> /* tag */, const char *name)
{
switch (Category) {
case MFParamCategory::SingleInput:
this->single_input<T>(name);
return;
case MFParamCategory::VectorInput:
this->vector_input<T>(name);
return;
case MFParamCategory::SingleOutput:
this->single_output<T>(name);
return;
case MFParamCategory::VectorOutput:
this->vector_output<T>(name);
return;
case MFParamCategory::SingleMutable:
this->single_mutable<T>(name);
return;
case MFParamCategory::VectorMutable:
this->vector_mutable<T>(name);
return;
}
BLI_assert_unreachable();
}
/* Context */
/** This indicates that the function accesses the context. This disables optimizations that
* depend on the fact that the function always performers the same operation. */
void depends_on_context()
{
signature_.depends_on_context = true;
}
};
} // namespace blender::fn
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