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/****************************************************************************
**
** Copyright (C) 2015 Klaralvdalens Datakonsult AB (KDAB).
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of Qt 3D Studio.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef DRAGONMAPPER_P_H
#define DRAGONMAPPER_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists for the convenience
// of other Qt classes. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <private/dragonbackendnode_p.h>
#include <private/dragonvaluecontainer_p.h>
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
namespace Dragon {
template<typename T, typename U>
class MapperWrapper;
/*!
* Simple wrapper which works around the fact that the frontend/arbiter expects a
* pointer to a constant object, while we want the data to be stored in an immutable
* or cow handle (the jury is still out on which to choose).
* T should be derived from Dragon::BackendNode
*/
template <class Backend, class BackendTarget=Backend>
class NodeFunctor : public Qt3DCore::QBackendNodeMapper
{
public:
NodeFunctor()
: m_localNodes(new ValueContainer<Backend>())
, m_nodes(m_localNodes.get())
{}
NodeFunctor(ValueContainer<Backend> *nodes)
: m_nodes(nodes)
{}
// TODO constructors, one takes nothing, creates nodes - other takes existing list
Qt3DCore::QBackendNode *create(const Qt3DCore::QNodeCreatedChangeBasePtr &change) const final;
Qt3DCore::QBackendNode *get(Qt3DCore::QNodeId id) const final
{
return m_wrappers.value(id);
}
void destroy(Qt3DCore::QNodeId id) const final
{
auto &nodes = *m_nodes;
// TODO consider use modified to show there's a copy
nodes.remove(id);
delete m_wrappers.take(id);
}
void initializeFromPeer(Qt3DCore::QNodeId id, const Qt3DCore::QNodeCreatedChangeBasePtr &change) const
{
auto &nodes = *m_nodes;
// Using a std::move here because we are assigning to the same node.
nodes[id] = std::move(nodes[id]).modified([&change](Backend *node){
node->initializeFromPeer(change);
});
}
void sceneChangeEvent(Qt3DCore::QNodeId id, const Qt3DCore::QSceneChangePtr &e) const
{
auto &nodes = *m_nodes;
// Using a std::move here because we are assigning to the same node.
nodes[id] = std::move(nodes[id]).modified([&e](Backend *element){
element->sceneChangeEvent(e);
});
// TODO consider adding a method to replace an item in the container directly:
// nodes.modify(id, [](Backend *element){
// element->sceneChangeEvent(e);
// });
}
// Task interface
ValueContainer<Backend> result()
{
return *m_nodes;
}
bool isFinished() const
{
return true;
}
// TODO a bit annoying that we need this to be run at the end of the frame
void reset()
{
m_nodes->reset();
}
private:
// NOTE mutable only because QBackendNodeMapper has a const interface (not sure why this is)
// TODO consider changing QBackendNodeMapper for this reason, or add a pointer in-between as hacky
// workaround
mutable QHash<Qt3DCore::QNodeId, MapperWrapper<Backend, BackendTarget> *> m_wrappers;
// TODO consider storing ValueContainer<BackendNode> (need to verify polymorphism)
mutable QScopedPointer<ValueContainer<Backend>> m_localNodes;
mutable ValueContainer<Backend> *m_nodes;
};
template <typename T, typename U>
class MapperWrapper : public Qt3DCore::QBackendNode
{
public:
MapperWrapper(const NodeFunctor<T, U> *manager)
: Qt3DCore::QBackendNode()
, m_manager(manager)
{
}
protected:
void sceneChangeEvent(const Qt3DCore::QSceneChangePtr &e) override
{
m_manager->sceneChangeEvent(peerId(), e);
}
private:
void initializeFromPeer(const Qt3DCore::QNodeCreatedChangeBasePtr &change) override
{
m_manager->initializeFromPeer(peerId(), change);
}
const NodeFunctor<T, U> *m_manager = nullptr;
};
// Note: Implementation needs to be here because we need the definition of MapperWrapper
template<class Backend, class BackendTarget>
Qt3DCore::QBackendNode *NodeFunctor<Backend, BackendTarget>::create(const Qt3DCore::QNodeCreatedChangeBasePtr &change) const
{
auto peerId = change->subjectId();
auto *wrapper = new MapperWrapper<Backend, BackendTarget>(this);
m_wrappers[peerId] = wrapper;
BackendTarget node;
node.setPeerId(peerId);
// TODO consider getting rid of this long-lived pointer
node.setManager(m_nodes);
m_nodes->insert(peerId, node);
return wrapper;
}
template<typename T, typename U=T>
using NodeFunctorPtr = QSharedPointer<NodeFunctor<T, U>>;
} // namespace Dragon
} // namespace Qt3DRender
QT_END_NAMESPACE
#endif // DRAGONMAPPER_P_H
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