NOD_multi_function.hh

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/* SPDX-FileCopyrightText: 2023 Blender Authors
 *
 * SPDX-License-Identifier: GPL-2.0-or-later */
 
#pragma once
 
#include "FN_multi_function.hh"
 
#include "DNA_node_types.h"
 
namespace blender::nodes {
 
class NodeMultiFunctions;

class NodeMultiFunctionBuilder : NonCopyable, NonMovable {
 private:
  const bNode &node_;
  const bNodeTree &tree_;
  std::shared_ptr<mf::MultiFunction> owned_built_fn_;
  const mf::MultiFunction *built_fn_ = nullptr;
 
  friend NodeMultiFunctions;
 
 public:
  NodeMultiFunctionBuilder(const bNode &node, const bNodeTree &tree);

  void set_matching_fn(const mf::MultiFunction *fn);
  void set_matching_fn(const mf::MultiFunction &fn);

  template<typename T, typename... Args> void construct_and_set_matching_fn(Args &&...args);

  template<typename Fn> void construct_and_set_matching_fn_cb(Fn &&create_multi_function);
 
  const bNode &node();
  const bNodeTree &tree();
  const mf::MultiFunction &function();
};

class NodeMultiFunctions {
 public:
  struct Item {
    const mf::MultiFunction *fn = nullptr;
    std::shared_ptr<mf::MultiFunction> owned_fn;
  };
 
 private:
  Map<const bNode *, Item> map_;
 
 public:
  NodeMultiFunctions(const bNodeTree &tree);
 
  const Item &try_get(const bNode &node) const;
};
 
/* -------------------------------------------------------------------- */
 
inline NodeMultiFunctionBuilder::NodeMultiFunctionBuilder(const bNode &node, const bNodeTree &tree)
    : node_(node), tree_(tree)
{
}
 
inline const bNode &NodeMultiFunctionBuilder::node()
{
  return node_;
}
 
inline const bNodeTree &NodeMultiFunctionBuilder::tree()
{
  return tree_;
}
 
inline const mf::MultiFunction &NodeMultiFunctionBuilder::function()
{
  return *built_fn_;
}
 
inline void NodeMultiFunctionBuilder::set_matching_fn(const mf::MultiFunction *fn)
{
  built_fn_ = fn;
}
 
inline void NodeMultiFunctionBuilder::set_matching_fn(const mf::MultiFunction &fn)
{
  built_fn_ = &fn;
}
 
template<typename T, typename... Args>
inline void NodeMultiFunctionBuilder::construct_and_set_matching_fn(Args &&...args)
{
  owned_built_fn_ = std::make_shared<T>(std::forward<Args>(args)...);
  built_fn_ = &*owned_built_fn_;
}
 
template<typename Fn>
inline void NodeMultiFunctionBuilder::construct_and_set_matching_fn_cb(Fn &&create_multi_function)
{
  using T = decltype(create_multi_function());
  T *allocated_function = new T(create_multi_function());
  owned_built_fn_ = std::shared_ptr<T>(allocated_function);
  built_fn_ = &*owned_built_fn_;
}

 
/* -------------------------------------------------------------------- */
 
inline const NodeMultiFunctions::Item &NodeMultiFunctions::try_get(const bNode &node) const
{
  static Item empty_item;
  const Item *item = map_.lookup_ptr(&node);
  if (item == nullptr) {
    return empty_item;
  }
  return *item;
}

 
}  // namespace blender::nodes