qquick3dobject.cpp

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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
 
#include "qquick3dobject.h"
#include "qquick3dobject_p.h"
#include "qquick3dscenemanager_p.h"
#include "qquick3ditem2d_p.h"
#include "qquick3dmodel_p.h"
 
#include <QtQuick3DRuntimeRender/private/qssgrendergraphobject_p.h>
 
#include <QtQml/private/qqmlglobal_p.h>
#include <QtQuick/private/qquickstategroup_p.h>
#include <QtQuick/private/qquickstate_p.h>
#include <QtQuick/private/qquickitem_p.h>
 
#include <private/qv4object_p.h>
#include <private/qv4qobjectwrapper_p.h>
 
QT_BEGIN_NAMESPACE
 
 
QQuick3DObject::QQuick3DObject(QQuick3DObject *parent)
    : QObject(*(new QQuick3DObjectPrivate(QQuick3DObjectPrivate::Type::Unknown)), parent)
{
    Q_D(QQuick3DObject);
    d->init(parent);
}
 
QQuick3DObject::~QQuick3DObject()
{
    Q_D(QQuick3DObject);
    // XXX todo - optimize
    while (!d->childItems.isEmpty())
        d->childItems.constFirst()->setParentItem(nullptr);
 
    delete d->_stateGroup;
    d->_stateGroup = nullptr;
    delete d->contentItem2d;
    d->contentItem2d = nullptr;
 
    if (d->parentItem)
        setParentItem(nullptr);
 
    if (d->sceneRefCount > 1)
        d->sceneRefCount = 1; // Make sure the scene is set to null in next call to derefSceneManager().
 
    if (!d->parentItem && d->sceneManager)
        QQuick3DObjectPrivate::derefSceneManager(this);
}
 
void QQuick3DObject::update()
{
    Q_D(QQuick3DObject);
    d->dirty(QQuick3DObjectPrivate::Content);
}
 
void QQuick3DObject::setParentItem(QQuick3DObject *parentItem)
{
    Q_D(QQuick3DObject);
    if (parentItem == d->parentItem)
        return;
 
    if (parentItem) {
        QQuick3DObject *itemAncestor = parentItem;
        while (itemAncestor != nullptr) {
            if (Q_UNLIKELY(itemAncestor == this)) {
                qWarning() << "QSSGObject::setParentItem: Parent" << parentItem << "is already part of the subtree of" << this;
                return;
            }
            itemAncestor = itemAncestor->parentItem();
        }
    }
 
    d->removeFromDirtyList();
 
    QQuick3DObject *oldParentItem = d->parentItem;
 
    if (oldParentItem) {
        QQuick3DObjectPrivate *op = QQuick3DObjectPrivate::get(oldParentItem);
 
        op->removeChild(this);
    } else if (d->sceneManager) {
        d->sceneManager->parentlessItems.remove(this);
    }
 
    const auto parentSceneManager = parentItem ? QQuick3DObjectPrivate::get(parentItem)->sceneManager : nullptr;
    if (d->sceneManager == parentSceneManager) {
        // Avoid freeing and reallocating resources if the window stays the same.
        d->parentItem = parentItem;
    } else {
        if (d->sceneManager)
            QQuick3DObjectPrivate::derefSceneManager(this);
        d->parentItem = parentItem;
        if (parentSceneManager)
            QQuick3DObjectPrivate::refSceneManager(this, *parentSceneManager);
    }
 
    d->dirty(QQuick3DObjectPrivate::ParentChanged);
 
    if (d->parentItem)
        QQuick3DObjectPrivate::get(d->parentItem)->addChild(this);
    else if (d->sceneManager)
        d->sceneManager->parentlessItems.insert(this);
 
    d->itemChange(ItemParentHasChanged, d->parentItem);
 
    emit parentChanged();
}
 
QString QQuick3DObject::state() const
{
    Q_D(const QQuick3DObject);
    return d->state();
}
 
void QQuick3DObject::setState(const QString &state)
{
    Q_D(QQuick3DObject);
    d->setState(state);
}
 
QList<QQuick3DObject *> QQuick3DObject::childItems() const
{
    Q_D(const QQuick3DObject);
    return d->childItems;
}
 
QQuick3DObject *QQuick3DObject::parentItem() const
{
    Q_D(const QQuick3DObject);
    return d->parentItem;
}
 
QSSGRenderGraphObject *QQuick3DObject::updateSpatialNode(QSSGRenderGraphObject *node)
{
    Q_QUICK3D_PROFILE_ASSIGN_ID_SG(this, node);
    return node;
}
 
void QQuick3DObject::markAllDirty()
{
}
 
void QQuick3DObject::itemChange(QQuick3DObject::ItemChange, const QQuick3DObject::ItemChangeData &)
{
}
 
QQuick3DObject::QQuick3DObject(QQuick3DObjectPrivate &dd, QQuick3DObject *parent)
    : QObject(dd, parent)
{
    Q_D(QQuick3DObject);
    d->init(parent);
}
 
void QQuick3DObject::classBegin()
{
    Q_D(QQuick3DObject);
    d->componentComplete = false;
    if (d->_stateGroup)
        d->_stateGroup->classBegin();
}
 
void QQuick3DObject::componentComplete()
{
    Q_D(QQuick3DObject);
    d->componentComplete = true;
    if (d->_stateGroup)
        d->_stateGroup->componentComplete();
 
    if (d->sceneManager && d->dirtyAttributes) {
        d->addToDirtyList();
    }
    Q_QUICK3D_PROFILE_REGISTER_D(this);
}
 
bool QQuick3DObject::isComponentComplete() const
{
    Q_D(const QQuick3DObject);
    return d->componentComplete;
}
 
void QQuick3DObject::preSync()
{
 
}
 
QQuick3DObjectPrivate::QQuick3DObjectPrivate(QQuick3DObjectPrivate::Type t)
    : _stateGroup(nullptr)
    , dirtyAttributes(0)
    , nextDirtyItem(nullptr)
    , prevDirtyItem(nullptr)
    , sceneManager(nullptr)
    , sceneRefCount(0)
    , parentItem(nullptr)
    , subFocusItem(nullptr)
    , type(t)
{
}
 
QQuick3DObjectPrivate::~QQuick3DObjectPrivate()
{
}
 
void QQuick3DObjectPrivate::init(QQuick3DObject *parent)
{
    Q_Q(QQuick3DObject);
 
    if (parent)
        q->setParentItem(parent);
}
 
QQmlListProperty<QObject> QQuick3DObjectPrivate::data()
{
    return QQmlListProperty<QObject>(q_func(),
                                     nullptr,
                                     QQuick3DObjectPrivate::data_append,
                                     QQuick3DObjectPrivate::data_count,
                                     QQuick3DObjectPrivate::data_at,
                                     QQuick3DObjectPrivate::data_clear);
}
 
QQmlListProperty<QObject> QQuick3DObjectPrivate::resources()
{
    return QQmlListProperty<QObject>(q_func(),
                                     nullptr,
                                     QQuick3DObjectPrivate::resources_append,
                                     QQuick3DObjectPrivate::resources_count,
                                     QQuick3DObjectPrivate::resources_at,
                                     QQuick3DObjectPrivate::resources_clear);
}
 
QQmlListProperty<QQuick3DObject> QQuick3DObjectPrivate::children()
{
    return QQmlListProperty<QQuick3DObject>(q_func(),
                                          nullptr,
                                          QQuick3DObjectPrivate::children_append,
                                          QQuick3DObjectPrivate::children_count,
                                          QQuick3DObjectPrivate::children_at,
                                          QQuick3DObjectPrivate::children_clear);
}
 
QQmlListProperty<QQuickState> QQuick3DObjectPrivate::states()
{
    return _states()->statesProperty();
}
 
QQmlListProperty<QQuickTransition> QQuick3DObjectPrivate::transitions()
{
    return _states()->transitionsProperty();
}
 
QString QQuick3DObjectPrivate::state() const
{
    return _stateGroup ? _stateGroup->state() : QString();
}
 
void QQuick3DObjectPrivate::setState(const QString &state)
{
    _states()->setState(state);
}
 
void QQuick3DObjectPrivate::data_append(QQmlListProperty<QObject> *prop, QObject *o)
{
    if (!o)
        return;
 
    QQuick3DObject *that = static_cast<QQuick3DObject *>(prop->object);
    QQuick3DObjectPrivate *privateItem = QQuick3DObjectPrivate::get(that);
 
    if (QQuick3DObject *item = qmlobject_cast<QQuick3DObject *>(o)) {
        item->setParentItem(that);
 
    } else {
        QQuickItem *quickItem = qobject_cast<QQuickItem *>(o);
        if (quickItem) {
            if (!privateItem->contentItem2d) {
                privateItem->contentItem2d = new QQuick3DItem2D(quickItem);
                privateItem->contentItem2d->setParent(that);
                privateItem->contentItem2d->setParentItem(that);
            } else {
                privateItem->contentItem2d->addChildItem(quickItem);
            }
            qmlobject_connect(privateItem->contentItem2d, QQuick3DItem2D, SIGNAL(allChildrenRemoved()),
                              that, QQuick3DObject, SLOT(_q_cleanupContentItem2D()));
        } else {
            o->setParent(that);
        }
    }
    resources_append(prop, o);
}
 
qsizetype QQuick3DObjectPrivate::data_count(QQmlListProperty<QObject> *property)
{
    QQuick3DObject *item = static_cast<QQuick3DObject *>(property->object);
    QQuick3DObjectPrivate *privateItem = QQuick3DObjectPrivate::get(item);
    QQmlListProperty<QObject> resourcesProperty = privateItem->resources();
    QQmlListProperty<QQuick3DObject> childrenProperty = privateItem->children();
 
    return resources_count(&resourcesProperty) + children_count(&childrenProperty);
}
 
QObject *QQuick3DObjectPrivate::data_at(QQmlListProperty<QObject> *property, qsizetype i)
{
    QQuick3DObject *item = static_cast<QQuick3DObject *>(property->object);
    QQuick3DObjectPrivate *privateItem = QQuick3DObjectPrivate::get(item);
    QQmlListProperty<QObject> resourcesProperty = privateItem->resources();
    QQmlListProperty<QQuick3DObject> childrenProperty = privateItem->children();
 
    int resourcesCount = resources_count(&resourcesProperty);
    if (i < resourcesCount)
        return resources_at(&resourcesProperty, i);
    const int j = i - resourcesCount;
    if (j < children_count(&childrenProperty))
        return children_at(&childrenProperty, j);
    return nullptr;
}
 
void QQuick3DObjectPrivate::data_clear(QQmlListProperty<QObject> *property)
{
    QQuick3DObject *item = static_cast<QQuick3DObject *>(property->object);
    QQuick3DObjectPrivate *privateItem = QQuick3DObjectPrivate::get(item);
    QQmlListProperty<QObject> resourcesProperty = privateItem->resources();
    QQmlListProperty<QQuick3DObject> childrenProperty = privateItem->children();
 
    resources_clear(&resourcesProperty);
    children_clear(&childrenProperty);
}
 
QObject *QQuick3DObjectPrivate::resources_at(QQmlListProperty<QObject> *prop, qsizetype index)
{
    QQuick3DObjectPrivate *quickItemPrivate = QQuick3DObjectPrivate::get(static_cast<QQuick3DObject *>(prop->object));
    return quickItemPrivate->extra.isAllocated() ? quickItemPrivate->extra->resourcesList.value(index) : 0;
}
 
void QQuick3DObjectPrivate::resources_append(QQmlListProperty<QObject> *prop, QObject *object)
{
    QQuick3DObject *quickItem = static_cast<QQuick3DObject *>(prop->object);
    QQuick3DObjectPrivate *quickItemPrivate = QQuick3DObjectPrivate::get(quickItem);
    if (!quickItemPrivate->extra.value().resourcesList.contains(object)) {
        quickItemPrivate->extra.value().resourcesList.append(object);
        // clang-format off
        qmlobject_connect(object, QObject, SIGNAL(destroyed(QObject*)),
                          quickItem, QQuick3DObject, SLOT(_q_resourceObjectDeleted(QObject*)));
        // clang-format on
    }
}
 
qsizetype QQuick3DObjectPrivate::resources_count(QQmlListProperty<QObject> *prop)
{
    QQuick3DObjectPrivate *quickItemPrivate = QQuick3DObjectPrivate::get(static_cast<QQuick3DObject *>(prop->object));
    return quickItemPrivate->extra.isAllocated() ? quickItemPrivate->extra->resourcesList.size() : 0;
}
 
void QQuick3DObjectPrivate::resources_clear(QQmlListProperty<QObject> *prop)
{
    QQuick3DObject *quickItem = static_cast<QQuick3DObject *>(prop->object);
    QQuick3DObjectPrivate *quickItemPrivate = QQuick3DObjectPrivate::get(quickItem);
    if (quickItemPrivate->extra.isAllocated()) { // If extra is not allocated resources is empty.
        for (QObject *object : std::as_const(quickItemPrivate->extra->resourcesList)) {
            // clang-format off
            qmlobject_disconnect(object, QObject, SIGNAL(destroyed(QObject*)),
                                 quickItem, QQuick3DObject, SLOT(_q_resourceObjectDeleted(QObject*)));
            // clang-format on
        }
        quickItemPrivate->extra->resourcesList.clear();
    }
}
 
void QQuick3DObjectPrivate::children_append(QQmlListProperty<QQuick3DObject> *prop, QQuick3DObject *o)
{
    if (!o)
        return;
 
    QQuick3DObject *that = static_cast<QQuick3DObject *>(prop->object);
    if (o->parentItem() == that)
        o->setParentItem(nullptr);
 
    o->setParentItem(that);
}
 
qsizetype QQuick3DObjectPrivate::children_count(QQmlListProperty<QQuick3DObject> *prop)
{
    QQuick3DObjectPrivate *p = QQuick3DObjectPrivate::get(static_cast<QQuick3DObject *>(prop->object));
    return p->childItems.size();
}
 
QQuick3DObject *QQuick3DObjectPrivate::children_at(QQmlListProperty<QQuick3DObject> *prop, qsizetype index)
{
    QQuick3DObjectPrivate *p = QQuick3DObjectPrivate::get(static_cast<QQuick3DObject *>(prop->object));
    if (index >= p->childItems.size() || index < 0)
        return nullptr;
 
    return p->childItems.at(index);
}
 
void QQuick3DObjectPrivate::children_clear(QQmlListProperty<QQuick3DObject> *prop)
{
    QQuick3DObject *that = static_cast<QQuick3DObject *>(prop->object);
    QQuick3DObjectPrivate *p = QQuick3DObjectPrivate::get(that);
    while (!p->childItems.isEmpty())
        p->childItems.at(0)->setParentItem(nullptr);
}
 
void QQuick3DObjectPrivate::_q_resourceObjectDeleted(QObject *object)
{
    if (extra.isAllocated() && extra->resourcesList.contains(object))
        extra->resourcesList.removeAll(object);
}
 
void QQuick3DObjectPrivate::_q_cleanupContentItem2D()
{
    // Only Schedule the item for deletion, as this may get called
    // as a result of teardown as well leading to a double delete
    if (contentItem2d)
        contentItem2d->deleteLater();
    contentItem2d = nullptr;
}
 
void QQuick3DObjectPrivate::addItemChangeListener(QQuick3DObjectChangeListener *listener, ChangeTypes types)
{
    changeListeners.append(ChangeListener(listener, types));
}
 
void QQuick3DObjectPrivate::updateOrAddItemChangeListener(QQuick3DObjectChangeListener *listener, ChangeTypes types)
{
    const ChangeListener changeListener(listener, types);
    const int index = changeListeners.indexOf(changeListener);
    if (index > -1)
        changeListeners[index].types = changeListener.types;
    else
        changeListeners.append(changeListener);
}
 
void QQuick3DObjectPrivate::removeItemChangeListener(QQuick3DObjectChangeListener *listener, ChangeTypes types)
{
    ChangeListener change(listener, types);
    changeListeners.removeOne(change);
}
 
QQuickStateGroup *QQuick3DObjectPrivate::_states()
{
    Q_Q(QQuick3DObject);
    if (!_stateGroup) {
        _stateGroup = new QQuickStateGroup;
        if (!componentComplete)
            _stateGroup->classBegin();
        // clang-format off
        qmlobject_connect(_stateGroup, QQuickStateGroup, SIGNAL(stateChanged(QString)),
                          q, QQuick3DObject, SIGNAL(stateChanged()));
        // clang-format on
    }
 
    return _stateGroup;
}
 
QString QQuick3DObjectPrivate::dirtyToString() const
{
#define DIRTY_TO_STRING(value)                                                                                         \
    if (dirtyAttributes & value) {                                                                                     \
        if (!rv.isEmpty())                                                                                             \
            rv.append(QLatin1Char('|'));                                                                               \
        rv.append(QLatin1String(#value));                                                                              \
    }
 
    //    QString rv = QLatin1String("0x") + QString::number(dirtyAttributes, 16);
    QString rv;
 
    DIRTY_TO_STRING(TransformOrigin);
    DIRTY_TO_STRING(Transform);
    DIRTY_TO_STRING(BasicTransform);
    DIRTY_TO_STRING(Position);
    DIRTY_TO_STRING(Size);
    DIRTY_TO_STRING(ZValue);
    DIRTY_TO_STRING(Content);
    DIRTY_TO_STRING(Smooth);
    DIRTY_TO_STRING(OpacityValue);
    DIRTY_TO_STRING(ChildrenChanged);
    DIRTY_TO_STRING(ChildrenStackingChanged);
    DIRTY_TO_STRING(ParentChanged);
    DIRTY_TO_STRING(Clip);
    DIRTY_TO_STRING(Window);
    DIRTY_TO_STRING(EffectReference);
    DIRTY_TO_STRING(Visible);
    DIRTY_TO_STRING(HideReference);
    DIRTY_TO_STRING(Antialiasing);
    DIRTY_TO_STRING(InstanceRootChanged);
 
    return rv;
}
 
void QQuick3DObjectPrivate::dirty(QQuick3DObjectPrivate::DirtyType type)
{
    // NOTE: Models that get an instance root has an "external" node that affects its transform
    // we therefore give models with an instance root a lower priority in the update list (See: addToDirtyList()).
    // For this to work we need to re-evaluate models priority when the instance root changes.
    if ((type & InstanceRootChanged) != 0)
        removeFromDirtyList();
 
    if (!(dirtyAttributes & type) || (sceneManager && !prevDirtyItem)) {
        dirtyAttributes |= type;
        if (sceneManager && componentComplete) {
            addToDirtyList();
        }
    }
}
 
void QQuick3DObjectPrivate::addToDirtyList()
{
    Q_Q(QQuick3DObject);
 
    Q_ASSERT(sceneManager);
    if (!prevDirtyItem) {
        Q_ASSERT(!nextDirtyItem);
 
        if (QSSGRenderGraphObject::isNodeType(type)) {
            // NOTE: We do special handling of models with an instance root (that is not itself...)
            // to ensure those models are processed after instance root nodes.
            const bool hasInstanceRoot = (type == Type::Model && static_cast<QQuick3DModel *>(q)->instanceRoot() && static_cast<QQuick3DModel *>(q)->instanceRoot() != q);
            const auto dirtyListIdx = !hasInstanceRoot ? QQuick3DSceneManager::nodeListIndex(type)
                                                       : size_t(QQuick3DSceneManager::NodePriority::ModelWithInstanceRoot);
            nextDirtyItem = sceneManager->dirtyNodes[dirtyListIdx];
            if (nextDirtyItem)
                QQuick3DObjectPrivate::get(nextDirtyItem)->prevDirtyItem = &nextDirtyItem;
            prevDirtyItem = &sceneManager->dirtyNodes[dirtyListIdx];
            sceneManager->dirtyNodes[dirtyListIdx] = q;
        } else if (QSSGRenderGraphObject::isExtension(type)) {
            const auto dirtyListIdx = QQuick3DSceneManager::extensionListIndex(type);
            nextDirtyItem = sceneManager->dirtyExtensions[dirtyListIdx];
            if (nextDirtyItem)
                QQuick3DObjectPrivate::get(nextDirtyItem)->prevDirtyItem = &nextDirtyItem;
            prevDirtyItem = &sceneManager->dirtyExtensions[dirtyListIdx];
            sceneManager->dirtyExtensions[dirtyListIdx] = q;
        } else {
            const auto dirtyListIdx = QQuick3DSceneManager::resourceListIndex(type);
            nextDirtyItem = sceneManager->dirtyResources[dirtyListIdx];
            if (nextDirtyItem)
                QQuick3DObjectPrivate::get(nextDirtyItem)->prevDirtyItem = &nextDirtyItem;
            prevDirtyItem = &sceneManager->dirtyResources[dirtyListIdx];
            sceneManager->dirtyResources[dirtyListIdx] = q;
        }
    }
    sceneManager->dirtyItem(q);
    Q_ASSERT(prevDirtyItem);
}
 
void QQuick3DObjectPrivate::removeFromDirtyList()
{
    if (prevDirtyItem) {
        if (nextDirtyItem)
            QQuick3DObjectPrivate::get(nextDirtyItem)->prevDirtyItem = prevDirtyItem;
        *prevDirtyItem = nextDirtyItem;
        prevDirtyItem = nullptr;
        nextDirtyItem = nullptr;
    }
    Q_ASSERT(!prevDirtyItem);
    Q_ASSERT(!nextDirtyItem);
}
 
void QQuick3DObjectPrivate::setCulled(bool cull)
{
    if (cull == culled)
        return;
 
    culled = cull;
    if ((cull && ++extra.value().hideRefCount == 1) || (!cull && --extra.value().hideRefCount == 0))
        dirty(HideReference);
}
 
void QQuick3DObjectPrivate::addChild(QQuick3DObject *child)
{
    Q_Q(QQuick3DObject);
 
    Q_ASSERT(!childItems.contains(child));
 
    childItems.append(child);
 
    dirty(QQuick3DObjectPrivate::ChildrenChanged);
 
    itemChange(QQuick3DObject::ItemChildAddedChange, child);
 
    emit q->childrenChanged();
}
 
void QQuick3DObjectPrivate::removeChild(QQuick3DObject *child)
{
    Q_Q(QQuick3DObject);
 
    Q_ASSERT(child);
    Q_ASSERT(childItems.contains(child));
    childItems.removeOne(child);
    Q_ASSERT(!childItems.contains(child));
 
    dirty(QQuick3DObjectPrivate::ChildrenChanged);
 
    itemChange(QQuick3DObject::ItemChildRemovedChange, child);
 
    emit q->childrenChanged();
}
 
void QQuick3DObjectPrivate::siblingOrderChanged()
{
    Q_Q(QQuick3DObject);
    if (!changeListeners.isEmpty()) {
        const auto listeners = changeListeners; // NOTE: intentional copy (QTBUG-54732)
        for (const QQuick3DObjectPrivate::ChangeListener &change : listeners) {
            if (change.types & QQuick3DObjectPrivate::SiblingOrder) {
                change.listener->itemSiblingOrderChanged(q);
            }
        }
    }
}
 
void QQuick3DObjectPrivate::refSceneManager(QQuick3DSceneManager &c)
{
    // An item needs a scene manager if it is referenced by another item which has a scene manager.
    // Typically the item is referenced by a parent, but can also be referenced by a
    // ShaderEffect or ShaderEffectSource. 'sceneRefCount' counts how many items with
    // a scene manager is referencing this item. When the reference count goes from zero to one,
    // or one to zero, the scene manager of this item is updated and propagated to the children.
    // As long as the reference count stays above zero, the scene manager is unchanged.
    // refSceneManager() increments the reference count.
    // derefSceneManager() decrements the reference count.
 
    Q_Q(QQuick3DObject);
 
    // Handle the case where the view has been deleted while the object lives on.
    if (sceneManager.isNull() && sceneRefCount == 1)
        sceneRefCount = 0;
 
    Q_ASSERT((sceneManager != nullptr) == (sceneRefCount > 0));
    if (++sceneRefCount > 1) {
        // Sanity check. Even if there's a different scene manager the window should be the same.
        if (c.window() != sceneManager->window()) {
            qWarning("QSSGObject: Cannot use same item on different windows at the same time.");
            return;
        }
 
        // NOTE: Simple tracking for resources that are shared between scenes.
        if (&c != sceneManager) {
            sharedResource = true;
            for (int ii = 0; ii < childItems.size(); ++ii) {
                QQuick3DObject *child = childItems.at(ii);
                QQuick3DObjectPrivate::get(child)->sharedResource = sharedResource;
                QQuick3DObjectPrivate::refSceneManager(child, c);
            }
        }
 
        return; // Scene manager already set.
    }
 
    Q_ASSERT(sceneManager == nullptr);
    sceneManager = &c;
 
    //    if (polishScheduled)
    //        QSSGWindowPrivate::get(window)->itemsToPolish.append(q);
 
    if (!parentItem)
        sceneManager->parentlessItems.insert(q);
    else
        sharedResource = QQuick3DObjectPrivate::get(parentItem)->sharedResource;
 
    for (int ii = 0; ii < childItems.size(); ++ii) {
        QQuick3DObject *child = childItems.at(ii);
        QQuick3DObjectPrivate::get(child)->sharedResource = sharedResource;
        QQuick3DObjectPrivate::refSceneManager(child, c);
    }
 
    dirty(Window);
 
    itemChange(QQuick3DObject::ItemSceneChange, &c);
}
 
void QQuick3DObjectPrivate::derefSceneManager()
{
    Q_Q(QQuick3DObject);
 
    if (!sceneManager)
        return; // This can happen when destroying recursive shader effect sources.
 
    if (--sceneRefCount > 0)
        return; // There are still other references, so don't set the scene manager to null yet.
 
    removeFromDirtyList();
    if (sceneManager)
        sceneManager->dirtyBoundingBoxList.removeAll(q);
 
    for (int ii = 0; ii < childItems.size(); ++ii) {
        QQuick3DObject *child = childItems.at(ii);
        QQuick3DObjectPrivate::derefSceneManager(child);
    }
 
    if (!parentItem)
        sceneManager->parentlessItems.remove(q);
 
    if (spatialNode) {
        sceneManager->cleanup(spatialNode);
        spatialNode = nullptr;
    }
 
    sceneManager = nullptr;
 
    dirty(Window);
 
    itemChange(QQuick3DObject::ItemSceneChange, sceneManager.data());
}
 
void QQuick3DObjectPrivate::updateSubFocusItem(QQuick3DObject *scope, bool focus)
{
    Q_Q(QQuick3DObject);
    Q_ASSERT(scope);
 
    QQuick3DObjectPrivate *scopePrivate = QQuick3DObjectPrivate::get(scope);
 
    QQuick3DObject *oldSubFocusItem = scopePrivate->subFocusItem;
    // Correct focus chain in scope
    if (oldSubFocusItem) {
        QQuick3DObject *sfi = scopePrivate->subFocusItem->parentItem();
        while (sfi && sfi != scope) {
            QQuick3DObjectPrivate::get(sfi)->subFocusItem = nullptr;
            sfi = sfi->parentItem();
        }
    }
 
    if (focus) {
        scopePrivate->subFocusItem = q;
        QQuick3DObject *sfi = scopePrivate->subFocusItem->parentItem();
        while (sfi && sfi != scope) {
            QQuick3DObjectPrivate::get(sfi)->subFocusItem = q;
            sfi = sfi->parentItem();
        }
    } else {
        scopePrivate->subFocusItem = nullptr;
    }
}
 
void QQuick3DObjectPrivate::itemChange(QQuick3DObject::ItemChange change, const QQuick3DObject::ItemChangeData &data)
{
    Q_Q(QQuick3DObject);
    switch (change) {
    case QQuick3DObject::ItemRotationHasChanged:
        // TODO:
        qWarning("ItemRoationHasChange is unhandled!!!!");
        break;
    case QQuick3DObject::ItemChildAddedChange: {
        q->itemChange(change, data);
        if (!changeListeners.isEmpty()) {
            const auto listeners = changeListeners; // NOTE: intentional copy (QTBUG-54732)
            for (const QQuick3DObjectPrivate::ChangeListener &change : listeners) {
                if (change.types & QQuick3DObjectPrivate::Children) {
                    change.listener->itemChildAdded(q, data.item);
                }
            }
        }
        break;
    }
    case QQuick3DObject::ItemChildRemovedChange: {
        q->itemChange(change, data);
        if (!changeListeners.isEmpty()) {
            const auto listeners = changeListeners; // NOTE: intentional copy (QTBUG-54732)
            for (const QQuick3DObjectPrivate::ChangeListener &change : listeners) {
                if (change.types & QQuick3DObjectPrivate::Children) {
                    change.listener->itemChildRemoved(q, data.item);
                }
            }
        }
        break;
    }
    case QQuick3DObject::ItemSceneChange:
        q->itemChange(change, data);
        break;
    case QQuick3DObject::ItemVisibleHasChanged: {
        q->itemChange(change, data);
        if (!changeListeners.isEmpty()) {
            const auto listeners = changeListeners; // NOTE: intentional copy (QTBUG-54732)
            for (const QQuick3DObjectPrivate::ChangeListener &change : listeners) {
                if (change.types & QQuick3DObjectPrivate::Visibility) {
                    change.listener->itemVisibilityChanged(q);
                }
            }
        }
        break;
    }
    case QQuick3DObject::ItemEnabledHasChanged: {
        q->itemChange(change, data);
        if (!changeListeners.isEmpty()) {
            const auto listeners = changeListeners; // NOTE: intentional copy (QTBUG-54732)
            for (const QQuick3DObjectPrivate::ChangeListener &change : listeners) {
                if (change.types & QQuick3DObjectPrivate::Enabled) {
                    change.listener->itemEnabledChanged(q);
                }
            }
        }
        break;
    }
    case QQuick3DObject::ItemParentHasChanged: {
        q->itemChange(change, data);
        if (!changeListeners.isEmpty()) {
            const auto listeners = changeListeners; // NOTE: intentional copy (QTBUG-54732)
            for (const QQuick3DObjectPrivate::ChangeListener &change : listeners) {
                if (change.types & QQuick3DObjectPrivate::Parent) {
                    change.listener->itemParentChanged(q, data.item);
                }
            }
        }
        break;
    }
    case QQuick3DObject::ItemOpacityHasChanged: {
        q->itemChange(change, data);
        if (!changeListeners.isEmpty()) {
            const auto listeners = changeListeners; // NOTE: intentional copy (QTBUG-54732)
            for (const QQuick3DObjectPrivate::ChangeListener &change : listeners) {
                if (change.types & QQuick3DObjectPrivate::Opacity) {
                    change.listener->itemOpacityChanged(q);
                }
            }
        }
        break;
    }
    case QQuick3DObject::ItemActiveFocusHasChanged:
        q->itemChange(change, data);
        break;
    case QQuick3DObject::ItemAntialiasingHasChanged:
        // fall through
    case QQuick3DObject::ItemDevicePixelRatioHasChanged:
        q->itemChange(change, data);
        break;
    }
}
 
namespace QV4 {
namespace Heap {
struct QSSGItemWrapper : public QObjectWrapper
{
    static void markObjects(QV4::Heap::Base *that, QV4::MarkStack *markStack);
};
}
}
 
struct QSSGItemWrapper : public QV4::QObjectWrapper
{
    V4_OBJECT2(QSSGItemWrapper, QV4::QObjectWrapper)
};
 
DEFINE_OBJECT_VTABLE(QSSGItemWrapper);
 
void QV4::Heap::QSSGItemWrapper::markObjects(QV4::Heap::Base *that, QV4::MarkStack *markStack)
{
    QObjectWrapper *This = static_cast<QObjectWrapper *>(that);
    if (QQuick3DObject *item = static_cast<QQuick3DObject *>(This->object())) {
        for (QQuick3DObject *child : std::as_const(QQuick3DObjectPrivate::get(item)->childItems))
            QV4::QObjectWrapper::markWrapper(child, markStack);
    }
    QObjectWrapper::markObjects(that, markStack);
}
 
quint64 QQuick3DObjectPrivate::_q_createJSWrapper(QQmlV4ExecutionEnginePtr engine)
{
    return (engine->memoryManager->allocate<QSSGItemWrapper>(q_func()))->asReturnedValue();
}
 
QQuick3DObjectPrivate::ExtraData::ExtraData() : hideRefCount(0) {}
 
QT_END_NAMESPACE
 
#include "moc_qquick3dobject.cpp"