eb0d216dc1
Previously, some multi-functions were allocated in a resource scope. This was fine as long as the multi-functions were only needed during the current evaluation of the node tree. However, now cases arise that require the multi-functions to be alive after the modifier is finished. For example, we want to evaluate fields created with geometry nodes outside of geometry nodes. To make this work, `std::shared_ptr` has to be used in a few more places. Realistically, this shouldn't have a noticable impact on performance. If this does become a bottleneck in the future, we can think about ways to make this work without using `shared_ptr` for multi-functions that are only used once.
137 lines
3.4 KiB
C++
137 lines
3.4 KiB
C++
/*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#pragma once
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#include "FN_multi_function.hh"
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#include "DNA_node_types.h"
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#include "NOD_derived_node_tree.hh"
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namespace blender::nodes {
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using namespace fn::multi_function_types;
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class NodeMultiFunctions;
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/**
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* Utility class to help nodes build a multi-function for themselves.
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*/
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class NodeMultiFunctionBuilder : NonCopyable, NonMovable {
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private:
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bNode &node_;
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bNodeTree &tree_;
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std::shared_ptr<MultiFunction> owned_built_fn_;
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const MultiFunction *built_fn_ = nullptr;
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friend NodeMultiFunctions;
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public:
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NodeMultiFunctionBuilder(bNode &node, bNodeTree &tree);
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/**
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* Assign a multi-function for the current node. The input and output parameters of the function
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* have to match the available sockets in the node.
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*/
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void set_matching_fn(const MultiFunction *fn);
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void set_matching_fn(const MultiFunction &fn);
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/**
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* Utility method for creating and assigning a multi-function when it can't have a static
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* lifetime.
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*/
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template<typename T, typename... Args> void construct_and_set_matching_fn(Args &&...args);
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bNode &node();
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bNodeTree &tree();
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};
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/**
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* Gives access to multi-functions for all nodes in a node tree that support them.
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*/
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class NodeMultiFunctions {
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public:
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struct Item {
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const MultiFunction *fn = nullptr;
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std::shared_ptr<MultiFunction> owned_fn;
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};
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private:
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Map<const bNode *, Item> map_;
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public:
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NodeMultiFunctions(const DerivedNodeTree &tree);
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const Item &try_get(const DNode &node) const;
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};
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/* -------------------------------------------------------------------- */
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/** \name #NodeMultiFunctionBuilder Inline Methods
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* \{ */
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inline NodeMultiFunctionBuilder::NodeMultiFunctionBuilder(bNode &node, bNodeTree &tree)
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: node_(node), tree_(tree)
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{
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}
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inline bNode &NodeMultiFunctionBuilder::node()
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{
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return node_;
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}
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inline bNodeTree &NodeMultiFunctionBuilder::tree()
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{
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return tree_;
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}
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inline void NodeMultiFunctionBuilder::set_matching_fn(const MultiFunction *fn)
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{
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built_fn_ = fn;
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}
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inline void NodeMultiFunctionBuilder::set_matching_fn(const MultiFunction &fn)
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{
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built_fn_ = &fn;
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}
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template<typename T, typename... Args>
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inline void NodeMultiFunctionBuilder::construct_and_set_matching_fn(Args &&...args)
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{
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owned_built_fn_ = std::make_shared<T>(std::forward<Args>(args)...);
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built_fn_ = &*owned_built_fn_;
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}
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/** \} */
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/* -------------------------------------------------------------------- */
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/** \name #NodeMultiFunctions Inline Methods
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* \{ */
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inline const NodeMultiFunctions::Item &NodeMultiFunctions::try_get(const DNode &node) const
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{
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static Item empty_item;
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const Item *item = map_.lookup_ptr(node->bnode());
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if (item == nullptr) {
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return empty_item;
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}
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return *item;
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}
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/** \} */
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} // namespace blender::nodes
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