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Internal/Contributor docs for the Qt SDK. Note: These are NOT official API docs; those are found at https://doc.qt.io/
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QQuick3DRenderExtension Class Reference

\inmodule QtQuick3D More...

#include <qquick3drenderextensions.h>

Inheritance diagram for QQuick3DRenderExtension:
Collaboration diagram for QQuick3DRenderExtension:

Public Member Functions

 QQuick3DRenderExtension (QQuick3DObject *parent=nullptr)
virtual ~QQuick3DRenderExtension ()
QSSGRenderGraphObject * updateSpatialNode (QSSGRenderGraphObject *node) override
 This function is called during the synchronization of the QtQuick3D scene graph when an item is created or when an update is requested, usually as a result of a change in the item's properties.
Public Member Functions inherited from QObject
Q_INVOKABLE QObject (QObject *parent=nullptr)
 Constructs an object with parent object parent.
virtual ~QObject ()
 Destroys the object, deleting all its child objects.
virtual bool event (QEvent *event)
 This virtual function receives events to an object and should return true if the event e was recognized and processed.
virtual bool eventFilter (QObject *watched, QEvent *event)
 Filters events if this object has been installed as an event filter for the watched object.
QString objectName () const
Q_WEAK_OVERLOAD void setObjectName (const QString &name)
 Sets the object's name to name.
void setObjectName (QAnyStringView name)
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
QBindable< QString > bindableObjectName ()
bool isWidgetType () const
 Returns true if the object is a widget; otherwise returns false.
bool isWindowType () const
 Returns true if the object is a window; otherwise returns false.
bool isQuickItemType () const
 Returns true if the object is a QQuickItem; otherwise returns false.
bool isQmlObjectType () const
 Returns whether the object has been created by the QML engine or ownership has been explicitly set via QJSEngine::setObjectOwnership().
bool signalsBlocked () const noexcept
 Returns true if signals are blocked; otherwise returns false.
bool blockSignals (bool b) noexcept
 If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it).
QThread * thread () const
 Returns the thread in which the object lives.
bool moveToThread (QThread *thread QT6_DECL_NEW_OVERLOAD_TAIL)
 Changes the thread affinity for this object and its children and returns true on success.
int startTimer (int interval, Qt::TimerType timerType=Qt::CoarseTimer)
 This is an overloaded function that will start a timer of type timerType and a timeout of interval milliseconds.
int startTimer (std::chrono::nanoseconds time, Qt::TimerType timerType=Qt::CoarseTimer)
void killTimer (int id)
 Kills the timer with timer identifier, id.
void killTimer (Qt::TimerId id)
template<typename T>
T findChild (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 Returns the child of this object that can be cast into type T and that is called name, or \nullptr if there is no such object.
template<typename T>
QList< T > findChildren (QAnyStringView aName, Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects.
template<typename T>
T findChild (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
template<typename T>
QList< T > findChildren (Qt::FindChildOptions options=Qt::FindChildrenRecursively) const
 This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
const QObjectList & children () const
 Returns a list of child objects.
void setParent (QObject *parent)
 Makes the object a child of parent.
void installEventFilter (QObject *filterObj)
 Installs an event filter filterObj on this object.
void removeEventFilter (QObject *obj)
 Removes an event filter object obj from this object.
QMetaObject::Connection connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
bool disconnect (const char *signal=nullptr, const QObject *receiver=nullptr, const char *member=nullptr) const
bool disconnect (const QObject *receiver, const char *member=nullptr) const
void dumpObjectTree () const
 Dumps a tree of children to the debug output.
void dumpObjectInfo () const
 Dumps information about signal connections, etc.
bool setProperty (const char *name, const QVariant &value)
 Sets the value of the object's name property to value.
bool setProperty (const char *name, QVariant &&value)
QVariant property (const char *name) const
 Returns the value of the object's name property.
QList< QByteArray > dynamicPropertyNames () const
QBindingStorage * bindingStorage ()
const QBindingStorage * bindingStorage () const
QObject * parent () const
 Returns a pointer to the parent object.
bool inherits (const char *classname) const
 Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false.
Public Member Functions inherited from QQmlParserStatus
 QQmlParserStatus ()
virtual ~QQmlParserStatus ()

Protected Member Functions

 QQuick3DRenderExtension (QQuick3DObjectPrivate &dd, QQuick3DObject *parent=nullptr)
 \qmltype RenderExtension \nativetype QQuick3DRenderExtension \inqmlmodule QtQuick3D \inherits Object3D
Protected Member Functions inherited from QQuick3DObject
virtual void markAllDirty ()
virtual void itemChange (ItemChange, const ItemChangeData &)
 QQuick3DObject (QQuick3DObjectPrivate &dd, QQuick3DObject *parent=nullptr)
void classBegin () override
 Invoked after class creation, but before any properties have been set.
void componentComplete () override
 Invoked after the root component that caused this instantiation has completed construction.
bool isComponentComplete () const
virtual void preSync ()
Protected Member Functions inherited from QObject
QObject * sender () const
 Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns \nullptr.
int senderSignalIndex () const
int receivers (const char *signal) const
 Returns the number of receivers connected to the signal.
bool isSignalConnected (const QMetaMethod &signal) const
virtual void timerEvent (QTimerEvent *event)
 This event handler can be reimplemented in a subclass to receive timer events for the object.
virtual void childEvent (QChildEvent *event)
 This event handler can be reimplemented in a subclass to receive child events.
virtual void customEvent (QEvent *event)
 This event handler can be reimplemented in a subclass to receive custom events.
virtual void connectNotify (const QMetaMethod &signal)
virtual void disconnectNotify (const QMetaMethod &signal)
 QObject (QObjectPrivate &dd, QObject *parent=nullptr)

Additional Inherited Members

Public Slots inherited from QQuick3DObject
void update ()
void setParentItem (QQuick3DObject *parentItem)
Public Slots inherited from QObject
void deleteLater ()
 \threadsafe
Signals inherited from QQuick3DObject
void parentChanged ()
void childrenChanged ()
void stateChanged ()
Signals inherited from QObject
void destroyed (QObject *=nullptr)
 This signal is emitted immediately before the object obj is destroyed, after any instances of QPointer have been notified, and cannot be blocked.
void objectNameChanged (const QString &objectName, QPrivateSignal)
 This signal is emitted after the object's name has been changed.
Static Public Member Functions inherited from QObject
static QMetaObject::Connection connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
 \threadsafe
static QMetaObject::Connection connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
template<typename Func1, typename Func2>
static QMetaObject::Connection connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::ContextTypeForFunctor< Func2 >::ContextType *context, Func2 &&slot, Qt::ConnectionType type=Qt::AutoConnection)
template<typename Func1, typename Func2>
static QMetaObject::Connection connect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, Func2 &&slot)
static bool disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
 \threadsafe
static bool disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
static bool disconnect (const QMetaObject::Connection &)
 Disconnect a connection.
template<typename Func1, typename Func2>
static bool disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const typename QtPrivate::FunctionPointer< Func2 >::Object *receiver, Func2 slot)
template<typename Func1>
static bool disconnect (const typename QtPrivate::FunctionPointer< Func1 >::Object *sender, Func1 signal, const QObject *receiver, void **zero)
Protected Attributes inherited from QObject
QScopedPointer< QObjectData > d_ptr
Properties inherited from QQuick3DObject
QQuick3DObject * parent
 \qmlproperty Object3D QtQuick3D::Object3D::parent This property holds the parent of the Object3D in a 3D scene.
Properties inherited from QObject
QString objectName
 the name of this object
Related Symbols inherited from QObject
 Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.
 \macro Q_CLASSINFO(Name, Value)

Detailed Description

\inmodule QtQuick3D

Since
6.7

Abstract class for implementing user side render extensions.

This is the front-end side of a render extension. The back-end side is implemented in \l QSSGRenderExtension. The QQuick3DRenderExtension class is used to create a custom render extension that can be used in the QtQuick3D scene graph by adding it to the list of extensions to be used with a \l View3D. The extension code will then be run as part of QtQuick3D's rendering pipeline execution.

The QQuick3DRenderExtension class is an abstract class that should be subclassed and exposed to QML. The subclass should implement the \l QQuick3DRenderExtension::updateSpatialNode() function and return a QSSGRenderExtension instance that contains the code that should be run.

See also
QSSGRenderExtension

Definition at line 16 of file qquick3drenderextensions.h.

Constructor & Destructor Documentation

◆ QQuick3DRenderExtension() [1/2]

QQuick3DRenderExtension::QQuick3DRenderExtension ( QQuick3DObject * parent = nullptr)
explicit

Definition at line 47 of file qquick3drenderextensions.cpp.

◆ ~QQuick3DRenderExtension()

QQuick3DRenderExtension::~QQuick3DRenderExtension ( )
virtual

Definition at line 53 of file qquick3drenderextensions.cpp.

◆ QQuick3DRenderExtension() [2/2]

QQuick3DRenderExtension::QQuick3DRenderExtension ( QQuick3DObjectPrivate & dd,
QQuick3DObject * parent = nullptr )
explicitprotected

\qmltype RenderExtension \nativetype QQuick3DRenderExtension \inqmlmodule QtQuick3D \inherits Object3D

Since
6.7

An uncreatable abstract base type for render extensions.

See also
QQuick3DRenderExtension, QSSGRenderExtension, QQuick3DViewport::extensions()

Definition at line 41 of file qquick3drenderextensions.cpp.

Member Function Documentation

◆ updateSpatialNode()

QSSGRenderGraphObject * QQuick3DRenderExtension::updateSpatialNode ( QSSGRenderGraphObject * node)
overridevirtual

This function is called during the synchronization of the QtQuick3D scene graph when an item is created or when an update is requested, usually as a result of a change in the item's properties.

The function should return a QSSGRenderExtension instance that contains the code that should be run during QtQuick3D's rendering pipeline execution.

The node parameter is the previous QSSGRenderExtension instance that was returned from this function, or null if this is the first time the function is called. The function can return the same instance, a different instance, or null. If the function returns null, the extension will be removed from the rendering pipeline.

Note
The QSSGRenderExtension instance is a resource object and will be owned by the QtQuick3D scene graph. If a different instance, or null, is returned, the previous instance will be queued for deletion by the renderer.
See also
QSSGRenderExtension

Reimplemented from QQuick3DObject.

Reimplemented in QQuick3DRenderOutputProvider, and QQuick3DTextureProviderExtension.

Definition at line 78 of file qquick3drenderextensions.cpp.

The documentation for this class was generated from the following files: