\inmodule QtOpenGLWidgets More...

#include <qopenglwidget.h>

Inheritance diagram for QOpenGLWidget:

Collaboration diagram for QOpenGLWidget:

Public Types
enum	UpdateBehavior { NoPartialUpdate , PartialUpdate }

enum	TargetBuffer : uint8_t { LeftBuffer = 0 , RightBuffer }

Public Types inherited from QWidget
enum	RenderFlag { DrawWindowBackground = 0x1 , DrawChildren = 0x2 , IgnoreMask = 0x4 }
	This enum describes how to render the widget when calling QWidget::render(). More...

Public Types inherited from QPaintDevice
enum	PaintDeviceMetric { PdmWidth = 1 , PdmHeight , PdmWidthMM , PdmHeightMM , PdmNumColors , PdmDepth , PdmDpiX , PdmDpiY , PdmPhysicalDpiX , PdmPhysicalDpiY , PdmDevicePixelRatio , PdmDevicePixelRatioScaled }

Signals
void	aboutToCompose ()
	This signal is emitted when the widget's top-level window is about to begin composing the textures of its QOpenGLWidget children and the other widgets.

void	frameSwapped ()
	This signal is emitted after the widget's top-level window has finished composition and returned from its potentially blocking QOpenGLContext::swapBuffers() call.

void	aboutToResize ()
	This signal is emitted when the widget's size is changed and therefore the framebuffer object is going to be recreated.

void	resized ()
	This signal is emitted right after the framebuffer object has been recreated due to resizing the widget.

Signals inherited from QWidget
void	windowTitleChanged (const QString &title)
	This signal is emitted when the window's title has changed, with the new title as an argument.

void	windowIconChanged (const QIcon &icon)
	This signal is emitted when the window's icon has changed, with the new icon as an argument.

void	windowIconTextChanged (const QString &iconText)
	This signal is emitted when the window's icon text has changed, with the new iconText as an argument.

void	customContextMenuRequested (const QPoint &pos)
	This signal is emitted when the widget's \l contextMenuPolicy is Qt::CustomContextMenu, and the user has requested a context menu on the widget.

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.

Public Member Functions
	QOpenGLWidget (QWidget *parent=nullptr, Qt::WindowFlags f=Qt::WindowFlags())
	Constructs a widget which is a child of parent, with widget flags set to f.

	~QOpenGLWidget ()
	Destroys the QOpenGLWidget instance, freeing its resources.

void	setUpdateBehavior (UpdateBehavior updateBehavior)
	Sets this widget's update behavior to updateBehavior.

UpdateBehavior	updateBehavior () const

void	setFormat (const QSurfaceFormat &format)
	Sets the requested surface format.

QSurfaceFormat	format () const
	Returns the context and surface format used by this widget and its toplevel window.

GLenum	textureFormat () const

void	setTextureFormat (GLenum texFormat)
	Sets a custom internal texture format of texFormat.

bool	isValid () const

void	makeCurrent ()
	Prepares for rendering OpenGL content for this widget by making the corresponding context current and binding the framebuffer object in that context.

void	makeCurrent (TargetBuffer targetBuffer)
	Prepares for rendering OpenGL content for this widget by making the context for the passed in buffer current and binding the framebuffer object in that context.

void	doneCurrent ()
	Releases the context.

QOpenGLContext *	context () const

GLuint	defaultFramebufferObject () const

GLuint	defaultFramebufferObject (TargetBuffer targetBuffer) const

QImage	grabFramebuffer ()
	Renders and returns a 32-bit RGB image of the framebuffer.

QImage	grabFramebuffer (TargetBuffer targetBuffer)
	Renders and returns a 32-bit RGB image of the framebuffer of the specified target buffer.

TargetBuffer	currentTargetBuffer () const
	Returns the currently active target buffer.

Public Member Functions inherited from QWidget
	QWidget (QWidget *parent=nullptr, Qt::WindowFlags f=Qt::WindowFlags())
	Constructs a widget which is a child of parent, with widget flags set to f.

	~QWidget ()
	Destroys the widget.

int	devType () const override

WId	winId () const
	Returns the window system identifier of the widget.

void	createWinId ()

WId	internalWinId () const

WId	effectiveWinId () const

QStyle *	style () const

void	setStyle (QStyle *)
	Sets the widget's GUI style to style.

bool	isWindow () const
	Returns `true` if the widget is an independent window, otherwise returns `false`.

bool	isModal () const

Qt::WindowModality	windowModality () const

void	setWindowModality (Qt::WindowModality windowModality)

bool	isEnabled () const

bool	isEnabledTo (const QWidget *) const
	Returns `true` if this widget would become enabled if ancestor is enabled; otherwise returns `false`.

QRect	frameGeometry () const

const QRect &	geometry () const

QRect	normalGeometry () const

int	x () const

int	y () const

QPoint	pos () const

QSize	frameSize () const

QSize	size () const

int	width () const

int	height () const

QRect	rect () const

QRect	childrenRect () const

QRegion	childrenRegion () const

QSize	minimumSize () const

QSize	maximumSize () const

int	minimumWidth () const

int	minimumHeight () const

int	maximumWidth () const

int	maximumHeight () const

void	setMinimumSize (const QSize &)

void	setMinimumSize (int minw, int minh)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This function corresponds to setMinimumSize(QSize(minw, minh)).

void	setMaximumSize (const QSize &)

void	setMaximumSize (int maxw, int maxh)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This function corresponds to setMaximumSize(QSize(maxw, maxh)).

void	setMinimumWidth (int minw)

void	setMinimumHeight (int minh)

void	setMaximumWidth (int maxw)

void	setMaximumHeight (int maxh)

QSize	sizeIncrement () const

void	setSizeIncrement (const QSize &)

void	setSizeIncrement (int w, int h)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Sets the x (width) size increment to w and the y (height) size increment to h.

QSize	baseSize () const

void	setBaseSize (const QSize &)

void	setBaseSize (int basew, int baseh)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This corresponds to setBaseSize(QSize(basew, baseh)).

void	setFixedSize (const QSize &)
	Sets both the minimum and maximum sizes of the widget to s, thereby preventing it from ever growing or shrinking.

void	setFixedSize (int w, int h)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Sets the width of the widget to w and the height to h.

void	setFixedWidth (int w)
	Sets both the minimum and maximum width of the widget to w without changing the heights.

void	setFixedHeight (int h)
	Sets both the minimum and maximum heights of the widget to h without changing the widths.

QPointF	mapToGlobal (const QPointF &) const
	Translates the widget coordinate pos to global screen coordinates.

QPoint	mapToGlobal (const QPoint &) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QPointF	mapFromGlobal (const QPointF &) const
	Translates the global screen coordinate pos to widget coordinates.

QPoint	mapFromGlobal (const QPoint &) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QPointF	mapToParent (const QPointF &) const
	Translates the widget coordinate pos to a coordinate in the parent widget.

QPoint	mapToParent (const QPoint &) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QPointF	mapFromParent (const QPointF &) const
	Translates the parent widget coordinate pos to widget coordinates.

QPoint	mapFromParent (const QPoint &) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QPointF	mapTo (const QWidget *, const QPointF &) const
	Translates the widget coordinate pos to the coordinate system of parent.

QPoint	mapTo (const QWidget *, const QPoint &) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QPointF	mapFrom (const QWidget *, const QPointF &) const
	Translates the widget coordinate pos from the coordinate system of parent to this widget's coordinate system.

QPoint	mapFrom (const QWidget *, const QPoint &) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QWidget *	window () const
	Returns the window for this widget, i.e.

QWidget *	nativeParentWidget () const

QWidget *	topLevelWidget () const

const QPalette &	palette () const

void	setPalette (const QPalette &)

void	setBackgroundRole (QPalette::ColorRole)
	Sets the background role of the widget to role.

QPalette::ColorRole	backgroundRole () const
	Returns the background role of the widget.

void	setForegroundRole (QPalette::ColorRole)
	Sets the foreground role of the widget to role.

QPalette::ColorRole	foregroundRole () const
	Returns the foreground role.

const QFont &	font () const

void	setFont (const QFont &)

QFontMetrics	fontMetrics () const
	Returns the font metrics for the widget's current font.

QFontInfo	fontInfo () const
	Returns the font info for the widget's current font.

QCursor	cursor () const

void	setCursor (const QCursor &)

void	unsetCursor ()

void	setMouseTracking (bool enable)

bool	hasMouseTracking () const

bool	underMouse () const
	Returns `true` if the widget is under the mouse cursor; otherwise returns `false`.

void	setTabletTracking (bool enable)

bool	hasTabletTracking () const

void	setMask (const QBitmap &)
	Causes only the pixels of the widget for which bitmap has a corresponding 1 bit to be visible.

void	setMask (const QRegion &)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Causes only the parts of the widget which overlap region to be visible.

QRegion	mask () const
	Returns the mask currently set on a widget.

void	clearMask ()
	Removes any mask set by setMask().

void	render (QPaintDevice *target, const QPoint &targetOffset=QPoint(), const QRegion &sourceRegion=QRegion(), RenderFlags renderFlags=RenderFlags(DrawWindowBackground\|DrawChildren))

void	render (QPainter *painter, const QPoint &targetOffset=QPoint(), const QRegion &sourceRegion=QRegion(), RenderFlags renderFlags=RenderFlags(DrawWindowBackground\|DrawChildren))
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Renders the widget into the painter's QPainter::device().

Q_INVOKABLE QPixmap	grab (const QRect &rectangle=QRect(QPoint(0, 0), QSize(-1, -1)))

void	grabGesture (Qt::GestureType type, Qt::GestureFlags flags=Qt::GestureFlags())
	Subscribes the widget to a given gesture with specific flags.

void	ungrabGesture (Qt::GestureType type)
	Unsubscribes the widget from a given gesture type.

QString	styleSheet () const

QString	windowTitle () const

void	setWindowIcon (const QIcon &icon)

QIcon	windowIcon () const

void	setWindowIconText (const QString &)

QString	windowIconText () const

void	setWindowRole (const QString &)
	Sets the window's role to role.

QString	windowRole () const
	Returns the window's role, or an empty string.

void	setWindowFilePath (const QString &filePath)

QString	windowFilePath () const

void	setWindowOpacity (qreal level)

qreal	windowOpacity () const

bool	isWindowModified () const

void	setLayoutDirection (Qt::LayoutDirection direction)

Qt::LayoutDirection	layoutDirection () const

void	unsetLayoutDirection ()

void	setLocale (const QLocale &locale)

QLocale	locale () const

void	unsetLocale ()

bool	isRightToLeft () const

bool	isLeftToRight () const

bool	isActiveWindow () const

void	activateWindow ()
	Sets the top-level widget containing this widget to be the active window.

void	clearFocus ()
	Takes keyboard input focus from the widget.

void	setFocus (Qt::FocusReason reason)
	Gives the keyboard input focus to this widget (or its focus proxy) if this widget or one of its parents is the \l{isActiveWindow()}{active window}.

Qt::FocusPolicy	focusPolicy () const

void	setFocusPolicy (Qt::FocusPolicy policy)

bool	hasFocus () const

void	setFocusProxy (QWidget *)
	Sets the widget's focus proxy to widget w.

QWidget *	focusProxy () const
	Returns the focus proxy, or \nullptr if there is no focus proxy.

Qt::ContextMenuPolicy	contextMenuPolicy () const

void	setContextMenuPolicy (Qt::ContextMenuPolicy policy)

void	grabMouse ()
	Grabs the mouse input.

void	grabMouse (const QCursor &)

void	releaseMouse ()
	Releases the mouse grab.

void	grabKeyboard ()
	Grabs the keyboard input.

void	releaseKeyboard ()
	Releases the keyboard grab.

int	grabShortcut (const QKeySequence &key, Qt::ShortcutContext context=Qt::WindowShortcut)
	Adds a shortcut to Qt's shortcut system that watches for the given key sequence in the given context.

void	releaseShortcut (int id)
	Removes the shortcut with the given id from Qt's shortcut system.

void	setShortcutEnabled (int id, bool enable=true)
	If enable is true, the shortcut with the given id is enabled; otherwise the shortcut is disabled.

void	setShortcutAutoRepeat (int id, bool enable=true)

bool	updatesEnabled () const

void	setUpdatesEnabled (bool enable)

void	update (int x, int y, int w, int h)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version updates a rectangle (x, y, w, h) inside the widget.

void	update (const QRect &)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version updates a rectangle rect inside the widget.

void	update (const QRegion &)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version repaints a region rgn inside the widget.

void	repaint (int x, int y, int w, int h)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version repaints a rectangle (x, y, w, h) inside the widget.

void	repaint (const QRect &)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version repaints a rectangle rect inside the widget.

void	repaint (const QRegion &)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version repaints a region rgn inside the widget.

void	stackUnder (QWidget *)
	Places the widget under w in the parent widget's stack.

void	move (int x, int y)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This corresponds to move(QPoint(x, y)).

void	move (const QPoint &)

void	resize (int w, int h)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This corresponds to resize(QSize(w, h)).

void	resize (const QSize &)

void	setGeometry (int x, int y, int w, int h)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This corresponds to setGeometry(QRect(x, y, w, h)).

void	setGeometry (const QRect &)

QByteArray	saveGeometry () const

bool	restoreGeometry (const QByteArray &geometry)

void	adjustSize ()
	Adjusts the size of the widget to fit its contents.

bool	isVisible () const

bool	isVisibleTo (const QWidget *) const
	Returns `true` if this widget would become visible if ancestor is shown; otherwise returns `false`.

bool	isHidden () const
	Returns `true` if the widget is hidden, otherwise returns `false`.

bool	isMinimized () const

bool	isMaximized () const

bool	isFullScreen () const

Qt::WindowStates	windowState () const
	Returns the current window state.

void	setWindowState (Qt::WindowStates state)
	Sets the window state to windowState.

void	overrideWindowState (Qt::WindowStates state)

virtual QSize	sizeHint () const

virtual QSize	minimumSizeHint () const

QSizePolicy	sizePolicy () const

void	setSizePolicy (QSizePolicy)

void	setSizePolicy (QSizePolicy::Policy horizontal, QSizePolicy::Policy vertical)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Sets the size policy of the widget to horizontal and vertical, with standard stretch and no height-for-width.

virtual int	heightForWidth (int) const
	Returns the preferred height for this widget, given the width w.

virtual bool	hasHeightForWidth () const

QRegion	visibleRegion () const
	Returns the unobscured region where paint events can occur.

void	setContentsMargins (int left, int top, int right, int bottom)
	Sets the margins around the contents of the widget to have the sizes left, top, right, and bottom.

void	setContentsMargins (const QMargins &margins)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

QMargins	contentsMargins () const
	The contentsMargins function returns the widget's contents margins.

QRect	contentsRect () const
	Returns the area inside the widget's margins.

QLayout *	layout () const
	Returns the layout manager that is installed on this widget, or \nullptr if no layout manager is installed.

void	setLayout (QLayout *)
	Sets the layout manager for this widget to layout.

void	updateGeometry ()
	Notifies the layout system that this widget has changed and may need to change geometry.

void	setParent (QWidget *parent)
	Sets the parent of the widget to parent, and resets the window flags.

void	setParent (QWidget *parent, Qt::WindowFlags f)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This function also takes widget flags, f as an argument.

void	scroll (int dx, int dy)
	Scrolls the widget including its children dx pixels to the right and dy downward.

void	scroll (int dx, int dy, const QRect &)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This version only scrolls r and does not move the children of the widget.

QWidget *	focusWidget () const
	Returns the last child of this widget that setFocus had been called on.

QWidget *	nextInFocusChain () const
	Returns the next widget in this widget's focus chain.

QWidget *	previousInFocusChain () const
	The previousInFocusChain function returns the previous widget in this widget's focus chain.

bool	acceptDrops () const

void	setAcceptDrops (bool on)

void	addAction (QAction *action)
	Appends the action action to this widget's list of actions.

void	addActions (const QList< QAction * > &actions)
	Appends the actions actions to this widget's list of actions.

void	insertActions (QAction before, const QList< QAction > &actions)
	Inserts the actions actions to this widget's list of actions, before the action before.

void	insertAction (QAction before, QAction action)
	Inserts the action action to this widget's list of actions, before the action before.

void	removeAction (QAction *action)
	Removes the action action from this widget's list of actions.

QList< QAction * >	actions () const
	Returns the (possibly empty) list of this widget's actions.

QAction *	addAction (const QString &text)

QAction *	addAction (const QIcon &icon, const QString &text)

QAction *	addAction (const QString &text, const QObject receiver, const char member, Qt::ConnectionType type=Qt::AutoConnection)

QAction *	addAction (const QIcon &icon, const QString &text, const QObject receiver, const char member, Qt::ConnectionType type=Qt::AutoConnection)

template<typename... Args, typename = compatible_action_slot_args<Args...>>
QAction *	addAction (const QString &text, Args &&...args)

template<typename... Args, typename = compatible_action_slot_args<Args...>>
QAction *	addAction (const QIcon &icon, const QString &text, Args &&...args)

QWidget *	parentWidget () const
	Returns the parent of this widget, or \nullptr if it does not have any parent widget.

void	setWindowFlags (Qt::WindowFlags type)

Qt::WindowFlags	windowFlags () const
	Window flags are a combination of a type (e.g.

void	setWindowFlag (Qt::WindowType, bool on=true)

void	overrideWindowFlags (Qt::WindowFlags type)
	Sets the window flags for the widget to flags, without telling the window system.

Qt::WindowType	windowType () const
	Returns the window type of this widget.

QWidget *	childAt (int x, int y) const
	Returns the visible child widget at the position ({x}, {y}) in the widget's coordinate system.

QWidget *	childAt (const QPoint &p) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Returns the visible child widget at point p in the widget's own coordinate system.

void	setAttribute (Qt::WidgetAttribute, bool on=true)
	Sets the attribute attribute on this widget if on is true; otherwise clears the attribute.

bool	testAttribute (Qt::WidgetAttribute) const
	Returns `true` if attribute attribute is set on this widget; otherwise returns `false`.

QPaintEngine *	paintEngine () const override
	Returns the widget's paint engine.

void	ensurePolished () const
	Ensures that the widget and its children have been polished by QStyle (i.e., have a proper font and palette).

bool	isAncestorOf (const QWidget *child) const
	Returns `true` if this widget is a parent, (or grandparent and so on to any level), of the given child, and both widgets are within the same window; otherwise returns `false`.

bool	autoFillBackground () const

void	setAutoFillBackground (bool enabled)

QBackingStore *	backingStore () const

QWindow *	windowHandle () const
	If this is a native widget, return the associated QWindow.

QScreen *	screen () const
	Returns the screen the widget is on.

void	setScreen (QScreen *)
	Sets the screen on which the widget should be shown to screen.

virtual QVariant	inputMethodQuery (Qt::InputMethodQuery) const
	This method is only relevant for input widgets.

Qt::InputMethodHints	inputMethodHints () const

void	setInputMethodHints (Qt::InputMethodHints hints)

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	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	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 QPaintDevice
virtual	~QPaintDevice ()

bool	paintingActive () const

int	width () const

int	height () const

int	widthMM () const

int	heightMM () const

int	logicalDpiX () const

int	logicalDpiY () const

int	physicalDpiX () const

int	physicalDpiY () const

qreal	devicePixelRatio () const

qreal	devicePixelRatioF () const

int	colorCount () const

int	depth () const

Protected Member Functions
virtual void	initializeGL ()
	This virtual function is called once before the first call to paintGL() or resizeGL().

virtual void	resizeGL (int w, int h)
	This virtual function is called whenever the widget has been resized.

virtual void	paintGL ()
	This virtual function is called whenever the widget needs to be painted.

void	paintEvent (QPaintEvent *e) override
	Handles paint events.

void	resizeEvent (QResizeEvent *e) override
	Handles resize events that are passed in the e event parameter.

bool	event (QEvent *e) override
	\reimp

int	metric (QPaintDevice::PaintDeviceMetric metric) const override
	\reimp

QPaintDevice *	redirected (QPoint *p) const override
	\reimp

QPaintEngine *	paintEngine () const override
	\reimp

Protected Member Functions inherited from QWidget
bool	event (QEvent *event) override
	This is the main event handler; it handles event event.

virtual void	mousePressEvent (QMouseEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive mouse press events for the widget.

virtual void	mouseReleaseEvent (QMouseEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive mouse release events for the widget.

virtual void	mouseDoubleClickEvent (QMouseEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive mouse double click events for the widget.

virtual void	mouseMoveEvent (QMouseEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive mouse move events for the widget.

virtual void	keyPressEvent (QKeyEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive key press events for the widget.

virtual void	keyReleaseEvent (QKeyEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive key release events for the widget.

virtual void	focusInEvent (QFocusEvent *event)
	This event handler can be reimplemented in a subclass to receive keyboard focus events (focus received) for the widget.

virtual void	focusOutEvent (QFocusEvent *event)
	This event handler can be reimplemented in a subclass to receive keyboard focus events (focus lost) for the widget.

virtual void	enterEvent (QEnterEvent *event)
	This event handler can be reimplemented in a subclass to receive widget enter events which are passed in the event parameter.

virtual void	leaveEvent (QEvent *event)
	This event handler can be reimplemented in a subclass to receive widget leave events which are passed in the event parameter.

virtual void	moveEvent (QMoveEvent *event)
	This event handler can be reimplemented in a subclass to receive widget move events which are passed in the event parameter.

virtual void	closeEvent (QCloseEvent *event)
	This event handler is called with the given event when Qt receives a window close request for a top-level widget from the window system.

virtual void	contextMenuEvent (QContextMenuEvent *event)
	This event handler, for event event, can be reimplemented in a subclass to receive widget context menu events.

virtual void	actionEvent (QActionEvent *event)
	This event handler is called with the given event whenever the widget's actions are changed.

virtual void	showEvent (QShowEvent *event)
	This event handler can be reimplemented in a subclass to receive widget show events which are passed in the event parameter.

virtual void	hideEvent (QHideEvent *event)
	This event handler can be reimplemented in a subclass to receive widget hide events.

virtual bool	nativeEvent (const QByteArray &eventType, void message, qintptr result)
	This special event handler can be reimplemented in a subclass to receive native platform events identified by eventType which are passed in the message parameter.

virtual void	changeEvent (QEvent *)
	This event handler can be reimplemented to handle state changes.

int	metric (PaintDeviceMetric) const override
	Internal implementation of the virtual QPaintDevice::metric() function.

void	initPainter (QPainter *painter) const override
	Initializes the painter pen, background and font to the same as the given widget's.

QPaintDevice *	redirected (QPoint *offset) const override

QPainter *	sharedPainter () const override

virtual void	inputMethodEvent (QInputMethodEvent *)
	This event handler, for event event, can be reimplemented in a subclass to receive Input Method composition events.

void	create (WId=0, bool initializeWindow=true, bool destroyOldWindow=true)
	Creates a new widget window.

void	destroy (bool destroyWindow=true, bool destroySubWindows=true)
	Frees up window system resources.

virtual bool	focusNextPrevChild (bool next)
	Finds a new widget to give the keyboard focus to, as appropriate for Tab and Shift+Tab, and returns `true` if it can find a new widget, or false if it can't.

bool	focusNextChild ()
	Finds a new widget to give the keyboard focus to, as appropriate for \uicontrol Tab, and returns `true` if it can find a new widget, or false if it can't.

bool	focusPreviousChild ()
	Finds a new widget to give the keyboard focus to, as appropriate for \uicontrol Shift+Tab, and returns `true` if it can find a new widget, or false if it can't.

	QWidget (QWidgetPrivate &d, QWidget *parent, Qt::WindowFlags f)

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)

Protected Member Functions inherited from QPaintDevice
	QPaintDevice () noexcept

Additional Inherited Members
Public Slots inherited from QWidget
void	setEnabled (bool)

void	setDisabled (bool)
	Disables widget input events if disable is true; otherwise enables input events.

void	setWindowModified (bool)

void	setWindowTitle (const QString &)

void	setStyleSheet (const QString &styleSheet)

void	setFocus ()
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.Gives the keyboard input focus to this widget (or its focus proxy) if this widget or one of its parents is the \l{isActiveWindow()}{active window}.

void	update ()
	Updates the widget unless updates are disabled or the widget is hidden.

void	repaint ()
	Repaints the widget directly by calling paintEvent() immediately, unless updates are disabled or the widget is hidden.

virtual void	setVisible (bool visible)

void	setHidden (bool hidden)
	Convenience function, equivalent to setVisible(!hidden).

void	show ()
	Shows the widget and its child widgets.

void	hide ()
	Hides the widget.

void	showMinimized ()
	Shows the widget minimized, as an icon.

void	showMaximized ()
	Shows the widget maximized.

void	showFullScreen ()
	Shows the widget in full-screen mode.

void	showNormal ()
	Restores the widget after it has been maximized or minimized.

bool	close ()
	Closes this widget.

void	raise ()
	Raises this widget to the top of the parent widget's stack.

void	lower ()
	Lowers the widget to the bottom of the parent widget's stack.

Public Slots inherited from QObject
void	deleteLater ()
	\threadsafe

Static Public Member Functions inherited from QWidget
static void	setTabOrder (QWidget , QWidget )
	Puts the second widget after the first widget in the focus order.

static void	setTabOrder (std::initializer_list< QWidget * > widgets)
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.

static QWidget *	mouseGrabber ()
	Returns the widget that is currently grabbing the mouse input.

static QWidget *	keyboardGrabber ()
	Returns the widget that is currently grabbing the keyboard input.

static QWidget *	find (WId)
	Returns a pointer to the widget with window identifier/handle id.

static QWidget *	createWindowContainer (QWindow window, QWidget parent=nullptr, Qt::WindowFlags flags=Qt::WindowFlags())
	Creates a QWidget that makes it possible to embed window into a QWidget-based application.

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)

Static Public Member Functions inherited from QPaintDevice
static qreal	devicePixelRatioFScale ()

Protected Slots inherited from QWidget
void	updateMicroFocus (Qt::InputMethodQuery query=Qt::ImQueryAll)
	Updates the widget's micro focus and informs input methods that the state specified by query has changed.

Protected Attributes inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Protected Attributes inherited from QPaintDevice
ushort	painters

Properties inherited from QWidget
bool	modal
	whether the widget is a modal widget

Qt::WindowModality	windowModality
	which windows are blocked by the modal widget

bool	enabled
	whether the widget is enabled

QRect	geometry
	the geometry of the widget relative to its parent and excluding the window frame

QRect	frameGeometry
	geometry of the widget relative to its parent including any window frame

QRect	normalGeometry
	the geometry of the widget as it will appear when shown as a normal (not maximized or full screen) top-level widget

int	x
	the x coordinate of the widget relative to its parent including any window frame

int	y
	the y coordinate of the widget relative to its parent and including any window frame

QPoint	pos
	the position of the widget within its parent widget

QSize	frameSize
	the size of the widget including any window frame

QSize	size
	the size of the widget excluding any window frame

int	width
	the width of the widget excluding any window frame

int	height
	the height of the widget excluding any window frame

QRect	rect
	the internal geometry of the widget excluding any window frame

QRect	childrenRect
	the bounding rectangle of the widget's children

QRegion	childrenRegion
	the combined region occupied by the widget's children

QSizePolicy	sizePolicy
	the default layout behavior of the widget

QSize	minimumSize
	the widget's minimum size

QSize	maximumSize
	the widget's maximum size in pixels

int	minimumWidth
	the widget's minimum width in pixels

int	minimumHeight
	the widget's minimum height in pixels

int	maximumWidth
	the widget's maximum width in pixels

int	maximumHeight
	the widget's maximum height in pixels

QSize	sizeIncrement
	the size increment of the widget

QSize	baseSize
	the base size of the widget

QPalette	palette
	the widget's palette

QFont	font
	the font currently set for the widget

QCursor	cursor
	the cursor shape for this widget

bool	mouseTracking
	whether mouse tracking is enabled for the widget

bool	tabletTracking
	whether tablet tracking is enabled for the widget

bool	isActiveWindow
	whether this widget's window is the active window

Qt::FocusPolicy	focusPolicy
	the way the widget accepts keyboard focus

bool	focus
	whether this widget (or its focus proxy) has the keyboard input focus

Qt::ContextMenuPolicy	contextMenuPolicy
	how the widget shows a context menu

bool	updatesEnabled
	whether updates are enabled

bool	visible
	whether the widget is visible

bool	minimized
	whether this widget is minimized (iconified)

bool	maximized
	whether this widget is maximized

bool	fullScreen
	whether the widget is shown in full screen mode

QSize	sizeHint
	the recommended size for the widget

QSize	minimumSizeHint
	the recommended minimum size for the widget

bool	acceptDrops
	whether drop events are enabled for this widget

QString	windowTitle
	the window title (caption)

QIcon	windowIcon
	the widget's icon

QString	windowIconText
	the text to be displayed on the icon of a minimized window

double	windowOpacity
	The level of opacity for the window.

bool	windowModified
	whether the document shown in the window has unsaved changes

Qt::LayoutDirection	layoutDirection
	the layout direction for this widget.

bool	autoFillBackground
	whether the widget background is filled automatically

QString	styleSheet
	the widget's style sheet

QLocale	locale
	the widget's locale

QString	windowFilePath
	the file path associated with a widget

Qt::InputMethodHints	inputMethodHints
	What input method specific hints the widget has.

Properties inherited from QObject
QString	objectName
	the name of this object

Related Symbols inherited from QWidget
	setupUi (QWidget *widget)
	\macro QWIDGETSIZE_MAX

Related Symbols inherited from QObject
template< class T > T	qobject_cast (const QObject *object)
	Returns the given object cast to type T if the object is of type T (or of a subclass); otherwise returns \nullptr.

template< typename T > T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

template< typename T > QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()

	QObjectList
	\macro Q_CLASSINFO(Name, Value)

Detailed Description

\inmodule QtOpenGLWidgets

Since: 5.4

The QOpenGLWidget class is a widget for rendering OpenGL graphics.

QOpenGLWidget provides functionality for displaying OpenGL graphics integrated into a Qt application. It is very simple to use: Make your class inherit from it and use the subclass like any other QWidget, except that you have the choice between using QPainter and standard OpenGL rendering commands.

QOpenGLWidget provides three convenient virtual functions that you can reimplement in your subclass to perform the typical OpenGL tasks:

\list

paintGL() - Renders the OpenGL scene. Gets called whenever the widget needs to be updated.
resizeGL() - Sets up the OpenGL viewport, projection, etc. Gets called whenever the widget has been resized (and also when it is shown for the first time because all newly created widgets get a resize event automatically).
initializeGL() - Sets up the OpenGL resources and state. Gets called once before the first time resizeGL() or paintGL() is called. \endlist

If you need to trigger a repaint from places other than paintGL() (a typical example is when using \l{QChronoTimer}{timers} to animate scenes), you should call the widget's update() function to schedule an update.

Your widget's OpenGL rendering context is made current when paintGL(), resizeGL(), or initializeGL() is called. If you need to call the standard OpenGL API functions from other places (e.g. in your widget's constructor or in your own paint functions), you must call makeCurrent() first.

All rendering happens into an OpenGL framebuffer object. makeCurrent() ensure that it is bound in the context. Keep this in mind when creating and binding additional framebuffer objects in the rendering code in paintGL(). Never re-bind the framebuffer with ID 0. Instead, call defaultFramebufferObject() to get the ID that should be bound.

QOpenGLWidget allows using different OpenGL versions and profiles when the platform supports it. Just set the requested format via setFormat(). Keep in mind however that having multiple QOpenGLWidget instances in the same window requires that they all use the same format, or at least formats that do not make the contexts non-sharable. To overcome this issue, prefer using QSurfaceFormat::setDefaultFormat() instead of setFormat().

Note: Calling QSurfaceFormat::setDefaultFormat() before constructing the QApplication instance is mandatory on some platforms (for example, \macos) when an OpenGL core profile context is requested. This is to ensure that resource sharing between contexts stays functional as all internal contexts are created using the correct version and profile.

Definition at line 17 of file qopenglwidget.h.

Member Enumeration Documentation

◆ TargetBuffer

enum QOpenGLWidget::TargetBuffer : uint8_t

Since: 6.5

Specifies the buffer to use when stereoscopic rendering is enabled, which is toggled by setting \l QSurfaceFormat::StereoBuffers.

Note: LeftBuffer is always the default and used as fallback value when stereoscopic rendering is disabled or not supported by the graphics driver.

\value LeftBuffer \value RightBuffer

Enumerator
LeftBuffer
RightBuffer

Definition at line 29 of file qopenglwidget.h.

◆ UpdateBehavior

enum QOpenGLWidget::UpdateBehavior

Since: 5.5

This enum describes the update semantics of QOpenGLWidget.

\value NoPartialUpdate QOpenGLWidget will discard the contents of the color buffer and the ancillary buffers after the QOpenGLWidget is rendered to screen. This is the same behavior that can be expected by calling QOpenGLContext::swapBuffers with a default opengl enabled QWindow as the argument. NoPartialUpdate can have some performance benefits on certain hardware architectures common in the mobile and embedded space when a framebuffer object is used as the rendering target. The framebuffer object is invalidated between frames with glInvalidateFramebuffer (if supported), or, as fallbacks, glDiscardFramebufferEXT (if supported) or a call to glClear.

\value PartialUpdate The framebuffer objects color buffer and ancillary buffers are not invalidated between frames.

See also: updateBehavior(), setUpdateBehavior()

Enumerator
NoPartialUpdate
PartialUpdate

Definition at line 23 of file qopenglwidget.h.

Constructor & Destructor Documentation

◆ QOpenGLWidget()

QOpenGLWidget::QOpenGLWidget	(	QWidget *	parent = nullptr,
		Qt::WindowFlags	f = Qt::WindowFlags() )

explicit

Constructs a widget which is a child of parent, with widget flags set to f.

Definition at line 1129 of file qopenglwidget.cpp.

References d, QPlatformIntegration::OpenGL, QGuiApplicationPrivate::platformIntegration(), Q_UNLIKELY, qWarning, and QPlatformIntegration::RhiBasedRendering.

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◆ ~QOpenGLWidget()

QOpenGLWidget::~QOpenGLWidget ( )

Destroys the QOpenGLWidget instance, freeing its resources.

The QOpenGLWidget's context is made current in the destructor, allowing for safe destruction of any child object that may need to release OpenGL resources belonging to the context provided by this widget.

Warning: if you have objects wrapping OpenGL resources (such as QOpenGLBuffer, QOpenGLShaderProgram, etc.) as members of a OpenGLWidget subclass, you may need to add a call to makeCurrent() in that subclass' destructor as well. Due to the rules of C++ object destruction, those objects will be destroyed {before} calling this function (but after that the destructor of the subclass has run), therefore making the OpenGL context current in this function happens too late for their safe disposal.

See also: makeCurrent

Definition at line 1157 of file qopenglwidget.cpp.

References d.

Member Function Documentation

◆ aboutToCompose

void QOpenGLWidget::aboutToCompose ( )

signal

This signal is emitted when the widget's top-level window is about to begin composing the textures of its QOpenGLWidget children and the other widgets.

◆ aboutToResize

void QOpenGLWidget::aboutToResize ( )

signal

This signal is emitted when the widget's size is changed and therefore the framebuffer object is going to be recreated.

◆ context()

QOpenGLContext * QOpenGLWidget::context ( ) const

Returns: The QOpenGLContext used by this widget or 0 if not yet initialized.

Note: The context and the framebuffer object used by the widget changes when reparenting the widget via setParent().

See also: QOpenGLContext::setShareContext(), defaultFramebufferObject()

Definition at line 1365 of file qopenglwidget.cpp.

References d.

◆ currentTargetBuffer()

QOpenGLWidget::TargetBuffer QOpenGLWidget::currentTargetBuffer ( ) const

Returns the currently active target buffer.

This will be the left buffer by default, the right buffer is only used when \l QSurfaceFormat::StereoBuffers is enabled. When stereoscopic rendering is enabled, this can be queried in paintGL() to know what buffer is currently in use. paintGL() will be called twice, once for each target.

Since: 6.5

See also: paintGL()

Definition at line 1579 of file qopenglwidget.cpp.

References d.

◆ defaultFramebufferObject() [1/2]

GLuint QOpenGLWidget::defaultFramebufferObject ( ) const

Returns: The framebuffer object handle or 0 if not yet initialized.

Note: The framebuffer object belongs to the context returned by context() and may not be accessible from other contexts.; The context and the framebuffer object used by the widget changes when reparenting the widget via setParent(). In addition, the framebuffer object changes on each resize.

See also: context()

Definition at line 1383 of file qopenglwidget.cpp.

References d, and LeftBuffer.

◆ defaultFramebufferObject() [2/2]

GLuint QOpenGLWidget::defaultFramebufferObject ( TargetBuffer targetBuffer ) const

Returns: The framebuffer object handle of the specified target buffer or 0 if not yet initialized.

Calling this overload only makes sense if \l QSurfaceFormat::StereoBuffers is enabled and supported by the hardware. If not, this method will return the default buffer.

Note: The framebuffer object belongs to the context returned by context() and may not be accessible from other contexts. The context and the framebuffer object used by the widget changes when reparenting the widget via setParent(). In addition, the framebuffer object changes on each resize.

Since: 6.5

See also: context()

Definition at line 1405 of file qopenglwidget.cpp.

References d.

◆ doneCurrent()

void QOpenGLWidget::doneCurrent ( )

Releases the context.

It is not necessary to call this function in most cases, since the widget will make sure the context is bound and released properly when invoking paintGL().

Definition at line 1348 of file qopenglwidget.cpp.

References d.

◆ event()

bool QOpenGLWidget::event ( QEvent * e )

overrideprotectedvirtual

\reimp

Reimplemented from QObject.

Definition at line 1696 of file qopenglwidget.cpp.

References Qt::AA_ShareOpenGLContexts, d, QPaintDevice::devicePixelRatio(), QEvent::DevicePixelRatioChange, QWidget::event(), QWidget::isHidden(), Q_FALLTHROUGH, QEvent::Show, QWidget::size, QCoreApplication::testAttribute(), QEvent::type(), QWidget::window(), QEvent::WindowAboutToChangeInternal, QEvent::WindowChangeInternal, and QWidget::windowHandle().

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◆ format()

QSurfaceFormat QOpenGLWidget::format ( ) const

Returns the context and surface format used by this widget and its toplevel window.

After the widget and its toplevel have both been created, resized and shown, this function will return the actual format of the context. This may differ from the requested format if the request could not be fulfilled by the platform. It is also possible to get larger color buffer sizes than requested.

When the widget's window and the related OpenGL resources are not yet initialized, the return value is the format that has been set via setFormat().

See also: setFormat(), context()

Definition at line 1233 of file qopenglwidget.cpp.

References d.

Referenced by makeCurrent(), and setFormat().

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◆ frameSwapped

void QOpenGLWidget::frameSwapped ( )

signal

This signal is emitted after the widget's top-level window has finished composition and returned from its potentially blocking QOpenGLContext::swapBuffers() call.

◆ grabFramebuffer() [1/2]

QImage QOpenGLWidget::grabFramebuffer ( )

Renders and returns a 32-bit RGB image of the framebuffer.

Note: This is a potentially expensive operation because it relies on glReadPixels() to read back the pixels. This may be slow and can stall the GPU pipeline.

Definition at line 1546 of file qopenglwidget.cpp.

References d.

◆ grabFramebuffer() [2/2]

QImage QOpenGLWidget::grabFramebuffer ( TargetBuffer targetBuffer )

Renders and returns a 32-bit RGB image of the framebuffer of the specified target buffer.

This overload only makes sense to call when \l QSurfaceFormat::StereoBuffers is enabled. Grabbing the framebuffer of the right target buffer will return the default image if stereoscopic rendering is disabled or if not supported by the hardware.

Note: This is a potentially expensive operation because it relies on glReadPixels() to read back the pixels. This may be slow and can stall the GPU pipeline.

Since: 6.5

Definition at line 1563 of file qopenglwidget.cpp.

References d.

◆ initializeGL()

void QOpenGLWidget::initializeGL ( )

protectedvirtual

This virtual function is called once before the first call to paintGL() or resizeGL().

Reimplement it in a subclass.

This function should set up any required OpenGL resources.

There is no need to call makeCurrent() because this has already been done when this function is called. Note however that the framebuffer is not yet available at this stage, so avoid issuing draw calls from here. Defer such calls to paintGL() instead.

See also: paintGL(), resizeGL()

Reimplemented in MyGLWidget, and MyGLWidget.

Definition at line 1424 of file qopenglwidget.cpp.

◆ isValid()

bool QOpenGLWidget::isValid ( ) const

Returns: true if the widget and OpenGL resources, like the context, have been successfully initialized. Note that the return value is always false until the widget is shown.

Definition at line 1285 of file qopenglwidget.cpp.

References d.

◆ makeCurrent() [1/2]

void QOpenGLWidget::makeCurrent ( )

Prepares for rendering OpenGL content for this widget by making the corresponding context current and binding the framebuffer object in that context.

It is not necessary to call this function in most cases, because it is called automatically before invoking paintGL().

See also: context(), paintGL(), doneCurrent()

Definition at line 1301 of file qopenglwidget.cpp.

References d.

Referenced by resizeEvent().

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◆ makeCurrent() [2/2]

void QOpenGLWidget::makeCurrent ( TargetBuffer targetBuffer )

Prepares for rendering OpenGL content for this widget by making the context for the passed in buffer current and binding the framebuffer object in that context.

Note: This only makes sense to call when stereoscopic rendering is enabled. Nothing will happen if the right buffer is requested when it's disabled.

It is not necessary to call this function in most cases, because it is called automatically before invoking paintGL().

Since: 6.5

See also: context(), paintGL(), doneCurrent()

Definition at line 1328 of file qopenglwidget.cpp.

References d, format(), and RightBuffer.

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◆ metric()

int QOpenGLWidget::metric ( QPaintDevice::PaintDeviceMetric metric ) const

overrideprotectedvirtual

\reimp

Reimplemented from QPaintDevice.

Definition at line 1588 of file qopenglwidget.cpp.

References d, QScreen::geometry, QRect::height(), QSizeF::height(), QWidget::height, QScreen::logicalDotsPerInchX, QScreen::logicalDotsPerInchY, QWidget::metric(), metric(), QPaintDevice::PdmDepth, QPaintDevice::PdmDevicePixelRatio, QPaintDevice::PdmDevicePixelRatioScaled, QPaintDevice::PdmDpiX, QPaintDevice::PdmDpiY, QPaintDevice::PdmHeight, QPaintDevice::PdmHeightMM, QPaintDevice::PdmNumColors, QPaintDevice::PdmPhysicalDpiX, QPaintDevice::PdmPhysicalDpiY, QPaintDevice::PdmWidth, QPaintDevice::PdmWidthMM, QScreen::physicalDotsPerInchX, QScreen::physicalDotsPerInchY, QScreen::physicalSize, QGuiApplication::primaryScreen, qRound(), qt_defaultDpiX(), qt_defaultDpiY(), qWarning, QWidget::screen(), QWidgetPrivate::TopLevel, QRect::width(), QSizeF::width(), QWidget::width, QWidget::window(), and QWidget::windowHandle().

Referenced by metric().

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◆ paintEngine()

QPaintEngine * QOpenGLWidget::paintEngine ( ) const

overrideprotectedvirtual

\reimp

Implements QPaintDevice.

Definition at line 1664 of file qopenglwidget.cpp.

References d, and QWidget::paintEngine().

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◆ paintEvent()

void QOpenGLWidget::paintEvent ( QPaintEvent * e )

overrideprotectedvirtual

Handles paint events.

Calling QWidget::update() will lead to sending a paint event e, and thus invoking this function. (NB this is asynchronous and will happen at some point after returning from update()). This function will then, after some preparation, call the virtual paintGL() to update the contents of the QOpenGLWidget's framebuffer. The widget's top-level window will then composite the framebuffer's texture with the rest of the window.

Reimplemented from QWidget.

Definition at line 1527 of file qopenglwidget.cpp.

References d, Q_UNUSED, and QWidget::updatesEnabled.

◆ paintGL()

void QOpenGLWidget::paintGL ( )

protectedvirtual

This virtual function is called whenever the widget needs to be painted.

Reimplement it in a subclass.

There is no need to call makeCurrent() because this has already been done when this function is called.

Before invoking this function, the context and the framebuffer are bound, and the viewport is set up by a call to glViewport(). No other state is set and no clearing or drawing is performed by the framework.

The default implementation performs a glClear(). Subclasses are not expected to invoke the base class implementation and should perform clearing on their own.

Note: To ensure portability, do not expect that state set in initializeGL() persists. Rather, set all necessary state, for example, by calling glEnable(), in paintGL(). This is because some platforms, such as WebAssembly with WebGL, may have limitations on OpenGL contexts in some situations, which can lead to using the context used with the QOpenGLWidget for other purposes as well.

When \l QSurfaceFormat::StereoBuffers is enabled, this function will be called twice - once for each buffer. Query what buffer is currently bound by calling currentTargetBuffer().

Note: The framebuffer of each target will be drawn to even when stereoscopic rendering is not supported by the hardware. Only the left buffer will actually be visible in the window.

See also: initializeGL(), resizeGL(), currentTargetBuffer()

Reimplemented in MyGLWidget.

Definition at line 1478 of file qopenglwidget.cpp.

References d.

◆ redirected()

QPaintDevice * QOpenGLWidget::redirected ( QPoint * p ) const

overrideprotectedvirtual

\reimp

Reimplemented from QPaintDevice.

Definition at line 1652 of file qopenglwidget.cpp.

References d, and QWidget::redirected().

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◆ resized

void QOpenGLWidget::resized ( )

signal

This signal is emitted right after the framebuffer object has been recreated due to resizing the widget.

◆ resizeEvent()

void QOpenGLWidget::resizeEvent ( QResizeEvent * e )

overrideprotectedvirtual

Handles resize events that are passed in the e event parameter.

Calls the virtual function resizeGL().

Note: Avoid overriding this function in derived classes. If that is not feasible, make sure that QOpenGLWidget's implementation is invoked too. Otherwise the underlying framebuffer object and related resources will not get resized properly and will lead to incorrect rendering.

Reimplemented from QWidget.

Definition at line 1494 of file qopenglwidget.cpp.

References d, QWidget::height, QSize::isEmpty(), makeCurrent(), resizeGL(), QResizeEvent::size(), QWidget::size, and QWidget::width.

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◆ resizeGL()

void QOpenGLWidget::resizeGL	(	int	w,
		int	h )

protectedvirtual

This virtual function is called whenever the widget has been resized.

Reimplement it in a subclass. The new size is passed in w and h.

There is no need to call makeCurrent() because this has already been done when this function is called. Additionally, the framebuffer is also bound.

See also: initializeGL(), paintGL()

Reimplemented in MyGLWidget.

Definition at line 1439 of file qopenglwidget.cpp.

References Q_UNUSED.

Referenced by resizeEvent().

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◆ setFormat()

void QOpenGLWidget::setFormat ( const QSurfaceFormat & format )

Sets the requested surface format.

When the format is not explicitly set via this function, the format returned by QSurfaceFormat::defaultFormat() will be used. This means that when having multiple OpenGL widgets, individual calls to this function can be replaced by one single call to QSurfaceFormat::setDefaultFormat() before creating the first widget.

Note: Requesting an alpha buffer via this function will not lead to the desired results when the intention is to make other widgets beneath visible. Instead, use Qt::WA_AlwaysStackOnTop to enable semi-transparent QOpenGLWidget instances with other widgets visible underneath. Keep in mind however that this breaks the stacking order, so it will no longer be possible to have other widgets on top of the QOpenGLWidget.

See also: format(), Qt::WA_AlwaysStackOnTop, QSurfaceFormat::setDefaultFormat()

Definition at line 1206 of file qopenglwidget.cpp.

References d, format(), Q_UNLIKELY, and qWarning.

Referenced by viewScene().

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◆ setTextureFormat()

void QOpenGLWidget::setTextureFormat ( GLenum texFormat )

Sets a custom internal texture format of texFormat.

When working with sRGB framebuffers, it will be necessary to specify a format like {GL_SRGB8_ALPHA8}. This can be achieved by calling this function.

Note: This function has no effect if called after the widget has already been shown and thus it performed initialization.; This function will typically have to be used in combination with a QSurfaceFormat::setDefaultFormat() call that sets the color space to QSurfaceFormat::sRGBColorSpace.

Since: 5.10

Definition at line 1255 of file qopenglwidget.cpp.

References d, Q_UNLIKELY, and qWarning.

◆ setUpdateBehavior()

void QOpenGLWidget::setUpdateBehavior ( UpdateBehavior updateBehavior )

Sets this widget's update behavior to updateBehavior.

Since: 5.5

Definition at line 1173 of file qopenglwidget.cpp.

References d, and updateBehavior().

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◆ textureFormat()

GLenum QOpenGLWidget::textureFormat ( ) const

Returns: the active internal texture format if the widget has already initialized, the requested format if one was set but the widget has not yet been made visible, or \nullptr if setTextureFormat() was not called and the widget has not yet been made visible.

Since: 5.10

Definition at line 1274 of file qopenglwidget.cpp.

References d.

◆ updateBehavior()

QOpenGLWidget::UpdateBehavior QOpenGLWidget::updateBehavior ( ) const

Returns: the update behavior of the widget.

Since: 5.5

Definition at line 1183 of file qopenglwidget.cpp.

References d.

Referenced by setUpdateBehavior().

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

qtbase/src/openglwidgets/qopenglwidget.h (ce9d708d514011db1ab45630c95222d2a30c7550)
qtbase/src/openglwidgets/qopenglwidget.cpp (50c81f549030aba3c29f8cd161662b019028e91b)

Public Types

Signals

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ TargetBuffer

◆ UpdateBehavior

Constructor & Destructor Documentation

◆ QOpenGLWidget()

◆ ~QOpenGLWidget()

Member Function Documentation

◆ aboutToCompose

◆ aboutToResize

◆ context()

◆ currentTargetBuffer()

◆ defaultFramebufferObject() [1/2]

◆ defaultFramebufferObject() [2/2]

◆ doneCurrent()

◆ event()

◆ format()

◆ frameSwapped

◆ grabFramebuffer() [1/2]

◆ grabFramebuffer() [2/2]

◆ initializeGL()

◆ isValid()

◆ makeCurrent() [1/2]

◆ makeCurrent() [2/2]

◆ metric()

◆ paintEngine()

◆ paintEvent()

◆ paintGL()

◆ redirected()

◆ resized

◆ resizeEvent()

◆ resizeGL()

◆ setFormat()

◆ setTextureFormat()

◆ setUpdateBehavior()

◆ textureFormat()

◆ updateBehavior()