The ShaderEffectItem object alters the output of given item with OpenGL shaders. More...

#include <shadereffectitem.h>

Inheritance diagram for ShaderEffectItem:

Classes
struct	SourceData

Signals
void	activeChanged ()

void	blendingChanged ()

void	fragmentShaderChanged ()

void	meshResolutionChanged ()

void	vertexShaderChanged ()

Signals inherited from QDeclarativeItem
void	activeFocusChanged (bool)

void	baselineOffsetChanged (qreal)

void	childrenRectChanged (const QRectF &)

void	clipChanged (bool)

void	focusChanged (bool)

void	implicitHeightChanged ()

void	implicitWidthChanged ()

void	parentChanged (QDeclarativeItem *)

void	smoothChanged (bool)

void	stateChanged (const QString &)

void	transformOriginChanged (TransformOrigin)

Signals inherited from QGraphicsObject
void	childrenChanged ()
	This signal gets emitted whenever the children list changes. More...

void	enabledChanged ()
	This signal gets emitted whenever the item get's enabled or disabled. More...

void	heightChanged ()

void	opacityChanged ()
	This signal gets emitted whenever the opacity of the item changes. More...

void	parentChanged ()
	This signal gets emitted whenever the parent of the item changes. More...

void	rotationChanged ()
	This signal gets emitted whenever the roation of the item changes. More...

void	scaleChanged ()
	This signal is emitted when the scale of the item changes. More...

void	visibleChanged ()
	This signal gets emitted whenever the visibility of the item changes. More...

void	widthChanged ()

void	xChanged ()
	This signal gets emitted whenever the x position of the item changes. More...

void	yChanged ()
	This signal gets emitted whenever the y position of the item changes. More...

void	zChanged ()
	This signal gets emitted whenever the z value of the item changes. More...

Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...

Public Functions
bool	blending () const

virtual void	componentComplete ()

QString	fragmentShader () const

QSize	meshResolution () const

void	paint (QPainter painter, const QStyleOptionGraphicsItem option, QWidget *widget=0)

void	preprocess ()

void	setBlending (bool enable)

void	setFragmentShader (const QString &code)

void	setMeshResolution (const QSize &size)

void	setVertexShader (const QString &code)

	ShaderEffectItem (QDeclarativeItem *parent=0)

QString	vertexShader () const

	~ShaderEffectItem ()

Public Functions inherited from QDeclarativeItem
qreal	baselineOffset () const

QRectF	boundingRect () const

Q_INVOKABLE QDeclarativeItem *	childAt (qreal x, qreal y) const
	Returns the visible child item at point (x, y), which is in this item's coordinate system, or 0 if there is no such item. More...

QRectF	childrenRect ()

bool	clip () const

Q_INVOKABLE void	forceActiveFocus ()
	Forces active focus on the item. More...

bool	hasActiveFocus () const

bool	hasFocus () const

qreal	height () const

qreal	implicitHeight () const

qreal	implicitWidth () const

bool	keepMouseGrab () const
	Returns a value indicating whether mouse input should remain with this item exclusively. More...

Q_INVOKABLE QScriptValue	mapFromItem (const QScriptValue &item, qreal x, qreal y) const
	Maps the point (x, y), which is in item's coordinate system, to this item's coordinate system, and returns a script value with `x` and `y` properties matching the mapped cooordinate. More...

Q_INVOKABLE QScriptValue	mapToItem (const QScriptValue &item, qreal x, qreal y) const
	Maps the point (x, y), which is in this item's coordinate system, to item's coordinate system, and returns a script value with `x` and `y` properties matching the mapped cooordinate. More...

QDeclarativeItem *	parentItem () const
	Returns the QDeclarativeItem parent of this item. More...

	QDeclarativeItem (QDeclarativeItem *parent=0)
	Constructs a QDeclarativeItem with the given parent. More...

void	resetHeight ()

void	resetWidth ()

void	setBaselineOffset (qreal)

void	setClip (bool)

void	setFocus (bool)

void	setHeight (qreal)

void	setKeepMouseGrab (bool)
	The flag indicating whether the mouse should remain with this item is set to keep. More...

void	setParentItem (QDeclarativeItem *parent)

void	setSize (const QSizeF &size)

void	setSmooth (bool)
	Sets whether the item should be drawn with antialiasing and smooth pixmap filtering to smooth. More...

void	setTransformOrigin (TransformOrigin)
	Set the transform origin. More...

void	setWidth (qreal)

bool	smooth () const

QDeclarativeListProperty< QGraphicsTransform >	transform ()

TransformOrigin	transformOrigin () const

qreal	width () const

virtual	~QDeclarativeItem ()
	Destroys the QDeclarativeItem. More...

Public Functions inherited from QGraphicsObject
void	grabGesture (Qt::GestureType type, Qt::GestureFlags flags=Qt::GestureFlags())
	Subscribes the graphics object to the given gesture with specific flags. More...

	QGraphicsObject (QGraphicsItem *parent=0)
	Constructs a QGraphicsObject with parent. More...

void	ungrabGesture (Qt::GestureType type)
	Unsubscribes the graphics object from the given gesture. More...

Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...

const QObjectList &	children () const
	Returns a list of child objects. More...

bool	connect (const QObject sender, const char signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const

bool	disconnect (const char signal=0, const QObject receiver=0, const char *member=0)

bool	disconnect (const QObject receiver, const char member=0)

void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...

void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...

QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...

virtual bool	eventFilter (QObject , QEvent )
	Filters events if this object has been installed as an event filter for the watched object. More...

template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...

template<typename T >
QList< T >	findChildren (const QString &aName=QString()) 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. More...

template<typename T >
QList< T >	findChildren (const QRegExp &re) const

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. More...

void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...

bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...

void	killTimer (int id)
	Kills the timer with timer identifier, id. More...

virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...

void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...

QString	objectName () const

QObject *	parent () const
	Returns a pointer to the parent object. More...

QVariant	property (const char *name) const
	Returns the value of the object's name property. More...

Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...

void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...

void	setObjectName (const QString &name)

void	setParent (QObject *)
	Makes the object a child of parent. More...

bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...

void	setUserData (uint id, QObjectUserData *data)

bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...

int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...

QThread *	thread () const
	Returns the thread in which the object lives. More...

QObjectUserData *	userData (uint id) const

virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Public Functions inherited from QGraphicsItem
bool	acceptDrops () const
	Returns true if this item can accept drag and drop events; otherwise, returns false. More...

Qt::MouseButtons	acceptedMouseButtons () const
	Returns the mouse buttons that this item accepts mouse events for. More...

bool	acceptHoverEvents () const
	Returns true if an item accepts hover events (QGraphicsSceneHoverEvent); otherwise, returns false. More...

bool	acceptsHoverEvents () const
	Call acceptHoverEvents() instead. More...

bool	acceptTouchEvents () const
	Returns true if an item accepts touch events; otherwise, returns false. More...

virtual void	advance (int phase)
	This virtual function is called twice for all items by the QGraphicsScene::advance() slot. More...

QRegion	boundingRegion (const QTransform &itemToDeviceTransform) const
	Returns the bounding region for this item. More...

qreal	boundingRegionGranularity () const
	Returns the item's bounding region granularity; a value between and including 0 and 1. More...

CacheMode	cacheMode () const
	Returns the cache mode for this item. More...

QList< QGraphicsItem * >	childItems () const
	Returns a list of this item's children. More...

QList< QGraphicsItem * >	children () const
	Use childItems() instead. More...

QRectF	childrenBoundingRect () const
	Returns the bounding rect of this item's descendants (i.e., its children, their children, etc.) in local coordinates. More...

void	clearFocus ()
	Takes keyboard input focus from the item. More...

QPainterPath	clipPath () const
	Returns this item's clip path, or an empty QPainterPath if this item is not clipped. More...

virtual bool	collidesWithItem (const QGraphicsItem *other, Qt::ItemSelectionMode mode=Qt::IntersectsItemShape) const
	Returns true if this item collides with other; otherwise returns false. More...

virtual bool	collidesWithPath (const QPainterPath &path, Qt::ItemSelectionMode mode=Qt::IntersectsItemShape) const
	Returns true if this item collides with path. More...

QList< QGraphicsItem * >	collidingItems (Qt::ItemSelectionMode mode=Qt::IntersectsItemShape) const
	Returns a list of all items that collide with this item. More...

QGraphicsItem *	commonAncestorItem (const QGraphicsItem *other) const
	Returns the closest common ancestor item of this item and other, or 0 if either other is 0, or there is no common ancestor. More...

virtual bool	contains (const QPointF &point) const
	Returns true if this item contains point, which is in local coordinates; otherwise, false is returned. More...

QCursor	cursor () const
	Returns the current cursor shape for the item. More...

QVariant	data (int key) const
	Returns this item's custom data for the key key as a QVariant. More...

QTransform	deviceTransform (const QTransform &viewportTransform) const
	Returns this item's device transformation matrix, using viewportTransform to map from scene to device coordinates. More...

qreal	effectiveOpacity () const
	Returns this item's effective opacity, which is between 0. More...

void	ensureVisible (const QRectF &rect=QRectF(), int xmargin=50, int ymargin=50)
	If this item is part of a scene that is viewed by a QGraphicsView, this convenience function will attempt to scroll the view to ensure that rect is visible inside the view's viewport. More...

void	ensureVisible (qreal x, qreal y, qreal w, qreal h, int xmargin=50, int ymargin=50)
	This convenience function is equivalent to calling ensureVisible(QRectF(x, y, w, h), xmargin, ymargin): More...

bool	filtersChildEvents () const
	Returns true if this item filters child events (i. More...

GraphicsItemFlags	flags () const
	Returns this item's flags. More...

QGraphicsItem *	focusItem () const
	If this item, a child or descendant of this item currently has input focus, this function will return a pointer to that item. More...

QGraphicsItem *	focusProxy () const
	Returns this item's focus proxy, or 0 if this item has no focus proxy. More...

QGraphicsItem *	focusScopeItem () const
	Returns this item's focus scope item. More...

void	grabKeyboard ()
	Grabs the keyboard input. More...

void	grabMouse ()
	Grabs the mouse input. More...

QGraphicsEffect *	graphicsEffect () const
	Returns a pointer to this item's effect if it has one; otherwise 0. More...

QGraphicsItemGroup *	group () const
	Returns a pointer to this item's item group, or 0 if this item is not member of a group. More...

bool	handlesChildEvents () const
	Returns true if this item handles child events (i. More...

bool	hasCursor () const
	Returns true if this item has a cursor set; otherwise, false is returned. More...

bool	hasFocus () const
	Returns true if this item is active, and it or its focus proxy has keyboard input focus; otherwise, returns false. More...

void	hide ()
	Hides the item. More...

Qt::InputMethodHints	inputMethodHints () const
	Returns the current input method hints of this item. More...

void	installSceneEventFilter (QGraphicsItem *filterItem)
	Installs an event filter for this item on filterItem, causing all events for this item to first pass through filterItem's sceneEventFilter() function. More...

bool	isActive () const
	Returns true if this item is active; otherwise returns false. More...

bool	isAncestorOf (const QGraphicsItem *child) const
	Returns true if this item is an ancestor of child (i.e., if this item is child's parent, or one of child's parent's ancestors). More...

bool	isBlockedByModalPanel (QGraphicsItem **blockingPanel=0) const
	Returns true if this item is blocked by a modal panel, false otherwise. More...

bool	isClipped () const
	Returns true if this item is clipped. More...

bool	isEnabled () const
	Returns true if the item is enabled; otherwise, false is returned. More...

bool	isObscured () const
	Returns true if this item's bounding rect is completely obscured by the opaque shape of any of colliding items above it (i.e., with a higher Z value than this item). More...

bool	isObscured (const QRectF &rect) const
	Returns true if rect is completely obscured by the opaque shape of any of colliding items above it (i. More...

bool	isObscured (qreal x, qreal y, qreal w, qreal h) const
	This convenience function is equivalent to calling isObscured(QRectF(x, y, w, h)). More...

virtual bool	isObscuredBy (const QGraphicsItem *item) const
	Returns true if this item's bounding rect is completely obscured by the opaque shape of item. More...

bool	isPanel () const
	Returns true if the item is a panel; otherwise returns false. More...

bool	isSelected () const
	Returns true if this item is selected; otherwise, false is returned. More...

bool	isUnderMouse () const
	Returns true if this item is currently under the mouse cursor in one of the views; otherwise, false is returned. More...

bool	isVisible () const
	Returns true if the item is visible; otherwise, false is returned. More...

bool	isVisibleTo (const QGraphicsItem *parent) const
	Returns true if the item is visible to parent; otherwise, false is returned. More...

bool	isWidget () const
	Returns true if this item is a widget (i. More...

bool	isWindow () const
	Returns true if the item is a QGraphicsWidget window, otherwise returns false. More...

QTransform	itemTransform (const QGraphicsItem other, bool ok=0) const
	Returns a QTransform that maps coordinates from this item to other. More...

QPointF	mapFromItem (const QGraphicsItem *item, const QPointF &point) const
	Maps the point point, which is in item's coordinate system, to this item's coordinate system, and returns the mapped coordinate. More...

QPolygonF	mapFromItem (const QGraphicsItem *item, const QRectF &rect) const
	Maps the rectangle rect, which is in item's coordinate system, to this item's coordinate system, and returns the mapped rectangle as a polygon. More...

QPolygonF	mapFromItem (const QGraphicsItem *item, const QPolygonF &polygon) const
	Maps the polygon polygon, which is in item's coordinate system, to this item's coordinate system, and returns the mapped polygon. More...

QPainterPath	mapFromItem (const QGraphicsItem *item, const QPainterPath &path) const
	Maps the path path, which is in item's coordinate system, to this item's coordinate system, and returns the mapped path. More...

QPointF	mapFromItem (const QGraphicsItem *item, qreal x, qreal y) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This convenience function is equivalent to calling mapFromItem(item, QPointF(x, y)). More...

QPolygonF	mapFromItem (const QGraphicsItem *item, qreal x, qreal y, qreal w, qreal h) const

QPointF	mapFromParent (const QPointF &point) const
	Maps the point point, which is in this item's parent's coordinate system, to this item's coordinate system, and returns the mapped coordinate. More...

QPolygonF	mapFromParent (const QRectF &rect) const
	Maps the rectangle rect, which is in this item's parent's coordinate system, to this item's coordinate system, and returns the mapped rectangle as a polygon. More...

QPolygonF	mapFromParent (const QPolygonF &polygon) const
	Maps the polygon polygon, which is in this item's parent's coordinate system, to this item's coordinate system, and returns the mapped polygon. More...

QPainterPath	mapFromParent (const QPainterPath &path) const
	Maps the path path, which is in this item's parent's coordinate system, to this item's coordinate system, and returns the mapped path. More...

QPointF	mapFromParent (qreal x, qreal y) const
	This convenience function is equivalent to calling mapFromParent(QPointF(x, y)). More...

QPolygonF	mapFromParent (qreal x, qreal y, qreal w, qreal h) const
	This convenience function is equivalent to calling mapFromItem(QRectF(x, y, w, h)). More...

QPointF	mapFromScene (const QPointF &point) const
	Maps the point point, which is in this item's scene's coordinate system, to this item's coordinate system, and returns the mapped coordinate. More...

QPolygonF	mapFromScene (const QRectF &rect) const
	Maps the rectangle rect, which is in this item's scene's coordinate system, to this item's coordinate system, and returns the mapped rectangle as a polygon. More...

QPolygonF	mapFromScene (const QPolygonF &polygon) const
	Maps the polygon polygon, which is in this item's scene's coordinate system, to this item's coordinate system, and returns the mapped polygon. More...

QPainterPath	mapFromScene (const QPainterPath &path) const
	Maps the path path, which is in this item's scene's coordinate system, to this item's coordinate system, and returns the mapped path. More...

QPointF	mapFromScene (qreal x, qreal y) const
	This convenience function is equivalent to calling mapFromScene(QPointF(x, y)). More...

QPolygonF	mapFromScene (qreal x, qreal y, qreal w, qreal h) const
	This convenience function is equivalent to calling mapFromScene(QRectF(x, y, w, h)). More...

QRectF	mapRectFromItem (const QGraphicsItem *item, const QRectF &rect) const
	Maps the rectangle rect, which is in item's coordinate system, to this item's coordinate system, and returns the mapped rectangle as a new rectangle (i. More...

QRectF	mapRectFromItem (const QGraphicsItem *item, qreal x, qreal y, qreal w, qreal h) const

QRectF	mapRectFromParent (const QRectF &rect) const
	Maps the rectangle rect, which is in this item's parent's coordinate system, to this item's coordinate system, and returns the mapped rectangle as a new rectangle (i. More...

QRectF	mapRectFromParent (qreal x, qreal y, qreal w, qreal h) const
	This convenience function is equivalent to calling mapRectFromParent(QRectF(x, y, w, h)). More...

QRectF	mapRectFromScene (const QRectF &rect) const
	Maps the rectangle rect, which is in scene coordinates, to this item's coordinate system, and returns the mapped rectangle as a new rectangle (i. More...

QRectF	mapRectFromScene (qreal x, qreal y, qreal w, qreal h) const
	This convenience function is equivalent to calling mapRectFromScene(QRectF(x, y, w, h)). More...

QRectF	mapRectToItem (const QGraphicsItem *item, const QRectF &rect) const
	Maps the rectangle rect, which is in this item's coordinate system, to item's coordinate system, and returns the mapped rectangle as a new rectangle (i. More...

QRectF	mapRectToItem (const QGraphicsItem *item, qreal x, qreal y, qreal w, qreal h) const

QRectF	mapRectToParent (const QRectF &rect) const
	Maps the rectangle rect, which is in this item's coordinate system, to its parent's coordinate system, and returns the mapped rectangle as a new rectangle (i. More...

QRectF	mapRectToParent (qreal x, qreal y, qreal w, qreal h) const
	This convenience function is equivalent to calling mapRectToParent(QRectF(x, y, w, h)). More...

QRectF	mapRectToScene (const QRectF &rect) const
	Maps the rectangle rect, which is in this item's coordinate system, to the scene coordinate system, and returns the mapped rectangle as a new rectangle (i. More...

QRectF	mapRectToScene (qreal x, qreal y, qreal w, qreal h) const
	This convenience function is equivalent to calling mapRectToScene(QRectF(x, y, w, h)). More...

QPointF	mapToItem (const QGraphicsItem *item, const QPointF &point) const
	Maps the point point, which is in this item's coordinate system, to item's coordinate system, and returns the mapped coordinate. More...

QPolygonF	mapToItem (const QGraphicsItem *item, const QRectF &rect) const
	Maps the rectangle rect, which is in this item's coordinate system, to item's coordinate system, and returns the mapped rectangle as a polygon. More...

QPolygonF	mapToItem (const QGraphicsItem *item, const QPolygonF &polygon) const
	Maps the polygon polygon, which is in this item's coordinate system, to item's coordinate system, and returns the mapped polygon. More...

QPainterPath	mapToItem (const QGraphicsItem *item, const QPainterPath &path) const
	Maps the path path, which is in this item's coordinate system, to item's coordinate system, and returns the mapped path. More...

QPointF	mapToItem (const QGraphicsItem *item, qreal x, qreal y) const
	This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.This convenience function is equivalent to calling mapToItem(item, QPointF(x, y)). More...

QPolygonF	mapToItem (const QGraphicsItem *item, qreal x, qreal y, qreal w, qreal h) const

QPointF	mapToParent (const QPointF &point) const
	Maps the point point, which is in this item's coordinate system, to its parent's coordinate system, and returns the mapped coordinate. More...

QPolygonF	mapToParent (const QRectF &rect) const
	Maps the rectangle rect, which is in this item's coordinate system, to its parent's coordinate system, and returns the mapped rectangle as a polygon. More...

QPolygonF	mapToParent (const QPolygonF &polygon) const
	Maps the polygon polygon, which is in this item's coordinate system, to its parent's coordinate system, and returns the mapped polygon. More...

QPainterPath	mapToParent (const QPainterPath &path) const
	Maps the path path, which is in this item's coordinate system, to its parent's coordinate system, and returns the mapped path. More...

QPointF	mapToParent (qreal x, qreal y) const
	This convenience function is equivalent to calling mapToParent(QPointF(x, y)). More...

QPolygonF	mapToParent (qreal x, qreal y, qreal w, qreal h) const
	This convenience function is equivalent to calling mapToParent(QRectF(x, y, w, h)). More...

QPointF	mapToScene (const QPointF &point) const
	Maps the point point, which is in this item's coordinate system, to the scene's coordinate system, and returns the mapped coordinate. More...

QPolygonF	mapToScene (const QRectF &rect) const
	Maps the rectangle rect, which is in this item's coordinate system, to the scene's coordinate system, and returns the mapped rectangle as a polygon. More...

QPolygonF	mapToScene (const QPolygonF &polygon) const
	Maps the polygon polygon, which is in this item's coordinate system, to the scene's coordinate system, and returns the mapped polygon. More...

QPainterPath	mapToScene (const QPainterPath &path) const
	Maps the path path, which is in this item's coordinate system, to the scene's coordinate system, and returns the mapped path. More...

QPointF	mapToScene (qreal x, qreal y) const
	This convenience function is equivalent to calling mapToScene(QPointF(x, y)). More...

QPolygonF	mapToScene (qreal x, qreal y, qreal w, qreal h) const
	This convenience function is equivalent to calling mapToScene(QRectF(x, y, w, h)). More...

QMatrix	matrix () const
	Returns the item's affine transformation matrix. More...

void	moveBy (qreal dx, qreal dy)
	Moves the item by dx points horizontally, and dy point vertically. More...

qreal	opacity () const
	Returns this item's local opacity, which is between 0. More...

virtual QPainterPath	opaqueArea () const
	This virtual function returns a shape representing the area where this item is opaque. More...

QGraphicsItem *	panel () const
	Returns the item's panel, or 0 if this item does not have a panel. More...

PanelModality	panelModality () const
	Returns the modality for this item. More...

QGraphicsItem *	parentItem () const
	Returns a pointer to this item's parent item. More...

QGraphicsObject *	parentObject () const
	Returns a pointer to the item's parent, cast to a QGraphicsObject. More...

QGraphicsWidget *	parentWidget () const
	Returns a pointer to the item's parent widget. More...

QPointF	pos () const
	Returns the position of the item in parent coordinates. More...

	QGraphicsItem (QGraphicsItem *parent=0)
	Constructs a QGraphicsItem with the given parent item. More...

void	removeSceneEventFilter (QGraphicsItem *filterItem)
	Removes an event filter on this item from filterItem. More...

void	resetMatrix ()
	Use resetTransform() instead. More...

void	resetTransform ()
	Resets this item's transformation matrix to the identity matrix or all the transformation properties to their default values. More...

void	rotate (qreal angle)
	Use. More...

qreal	rotation () const
	Returns the clockwise rotation, in degrees, around the Z axis. More...

void	scale (qreal sx, qreal sy)
	Use. More...

qreal	scale () const
	Returns the scale factor of the item. More...

QGraphicsScene *	scene () const
	Returns the current scene for the item, or 0 if the item is not stored in a scene. More...

QRectF	sceneBoundingRect () const
	Returns the bounding rect of this item in scene coordinates, by combining sceneTransform() with boundingRect(). More...

QMatrix	sceneMatrix () const
	Use sceneTransform() instead. More...

QPointF	scenePos () const
	Returns the item's position in scene coordinates. More...

QTransform	sceneTransform () const
	Returns this item's scene transformation matrix. More...

void	scroll (qreal dx, qreal dy, const QRectF &rect=QRectF())
	Scrolls the contents of rect by dx, dy. More...

void	setAcceptDrops (bool on)
	If on is true, this item will accept drag and drop events; otherwise, it is transparent for drag and drop events. More...

void	setAcceptedMouseButtons (Qt::MouseButtons buttons)
	Sets the mouse buttons that this item accepts mouse events for. More...

void	setAcceptHoverEvents (bool enabled)
	If enabled is true, this item will accept hover events; otherwise, it will ignore them. More...

void	setAcceptsHoverEvents (bool enabled)
	Use setAcceptHoverEvents(enabled) instead. More...

void	setAcceptTouchEvents (bool enabled)
	If enabled is true, this item will accept touch events; otherwise, it will ignore them. More...

void	setActive (bool active)
	If active is true, and the scene is active, this item's panel will be activated. More...

void	setBoundingRegionGranularity (qreal granularity)
	Sets the bounding region granularity to granularity; a value between and including 0 and 1. More...

void	setCacheMode (CacheMode mode, const QSize &cacheSize=QSize())
	Sets the item's cache mode to mode. More...

void	setCursor (const QCursor &cursor)
	Sets the current cursor shape for the item to cursor. More...

void	setData (int key, const QVariant &value)
	Sets this item's custom data for the key key to value. More...

void	setEnabled (bool enabled)
	If enabled is true, the item is enabled; otherwise, it is disabled. More...

void	setFiltersChildEvents (bool enabled)
	If enabled is true, this item is set to filter all events for all its children (i. More...

void	setFlag (GraphicsItemFlag flag, bool enabled=true)
	If enabled is true, the item flag flag is enabled; otherwise, it is disabled. More...

void	setFlags (GraphicsItemFlags flags)
	Sets the item flags to flags. More...

void	setFocus (Qt::FocusReason focusReason=Qt::OtherFocusReason)
	Gives keyboard input focus to this item. More...

void	setFocusProxy (QGraphicsItem *item)
	Sets the item's focus proxy to item. More...

void	setGraphicsEffect (QGraphicsEffect *effect)
	Sets effect as the item's effect. More...

void	setGroup (QGraphicsItemGroup *group)
	Adds this item to the item group group. More...

void	setHandlesChildEvents (bool enabled)
	If enabled is true, this item is set to handle all events for all its children (i. More...

void	setInputMethodHints (Qt::InputMethodHints hints)
	Sets the current input method hints of this item to hints. More...

void	setMatrix (const QMatrix &matrix, bool combine=false)
	Sets the item's affine transformation matrix. More...

void	setOpacity (qreal opacity)
	Sets this item's local opacity, between 0. More...

void	setPanelModality (PanelModality panelModality)
	Sets the modality for this item to panelModality. More...

void	setParentItem (QGraphicsItem *parent)
	Sets this item's parent item to newParent. More...

void	setPos (const QPointF &pos)
	Sets the position of the item to pos, which is in parent coordinates. More...

void	setPos (qreal x, qreal y)
	This convenience function is equivalent to calling setPos(QPointF(x, y)). More...

void	setRotation (qreal angle)
	Sets the clockwise rotation angle, in degrees, around the Z axis. More...

void	setScale (qreal scale)
	Sets the scale factor of the item. More...

void	setSelected (bool selected)
	If selected is true and this item is selectable, this item is selected; otherwise, it is unselected. More...

void	setToolTip (const QString &toolTip)
	Sets the item's tool tip to toolTip. More...

void	setTransform (const QTransform &matrix, bool combine=false)
	Sets the item's current transformation matrix to matrix. More...

void	setTransformations (const QList< QGraphicsTransform *> &transformations)
	Sets a list of graphics transformations (QGraphicsTransform) that currently apply to this item. More...

void	setTransformOriginPoint (const QPointF &origin)
	Sets the origin point for the transformation in item coordinates. More...

void	setTransformOriginPoint (qreal ax, qreal ay)
	Sets the origin point for the transformation in item coordinates. More...

void	setVisible (bool visible)
	If visible is true, the item is made visible. More...

void	setX (qreal x)
	Set's the x coordinate of the item's position. More...

void	setY (qreal y)
	Set's the y coordinate of the item's position. More...

void	setZValue (qreal z)
	Sets the Z-value of the item to z. More...

virtual QPainterPath	shape () const
	Returns the shape of this item as a QPainterPath in local coordinates. More...

void	shear (qreal sh, qreal sv)
	Use. More...

void	show ()
	Shows the item. More...

void	stackBefore (const QGraphicsItem *sibling)
	Stacks this item before sibling, which must be a sibling item (i. More...

QGraphicsObject *	toGraphicsObject ()
	Return the graphics item cast to a QGraphicsObject, if the class is actually a graphics object, 0 otherwise. More...

const QGraphicsObject *	toGraphicsObject () const
	Return the graphics item cast to a QGraphicsObject, if the class is actually a graphics object, 0 otherwise. More...

QString	toolTip () const
	Returns the item's tool tip, or an empty QString if no tool tip has been set. More...

QGraphicsItem *	topLevelItem () const
	Returns this item's top-level item. More...

QGraphicsWidget *	topLevelWidget () const
	Returns a pointer to the item's top level widget (i. More...

QTransform	transform () const
	Returns this item's transformation matrix. More...

QList< QGraphicsTransform * >	transformations () const
	Returns a list of graphics transforms that currently apply to this item. More...

QPointF	transformOriginPoint () const
	Returns the origin point for the transformation in item coordinates. More...

void	translate (qreal dx, qreal dy)
	Use setPos() or setTransformOriginPoint() instead. More...

virtual int	type () const
	Returns the type of an item as an int. More...

void	ungrabKeyboard ()
	Releases the keyboard grab. More...

void	ungrabMouse ()
	Releases the mouse grab. More...

void	unsetCursor ()
	Clears the cursor from this item. More...

void	update (const QRectF &rect=QRectF())
	Schedules a redraw of the area covered by rect in this item. More...

void	update (qreal x, qreal y, qreal width, qreal height)
	This convenience function is equivalent to calling update(QRectF(x, y, width, height)). More...

QGraphicsWidget *	window () const
	Returns the item's window, or 0 if this item does not have a window. More...

qreal	x () const
	This convenience function is equivalent to calling pos(). More...

qreal	y () const
	This convenience function is equivalent to calling pos(). More...

qreal	zValue () const
	Returns the Z-value of the item. More...

virtual	~QGraphicsItem ()
	Destroys the QGraphicsItem and all its children. More...

Public Functions inherited from QDeclarativeParserStatus
	QDeclarativeParserStatus ()

virtual	~QDeclarativeParserStatus ()

Protected Functions
virtual void	geometryChanged (const QRectF &newGeometry, const QRectF &oldGeometry)
	This function is called to handle this item's changes in geometry from oldGeometry to newGeometry. More...

Protected Functions inherited from QDeclarativeItem
virtual void	classBegin ()

virtual bool	event (QEvent *)

bool	heightValid () const
	Returns whether the height property has been set explicitly. More...

virtual void	inputMethodEvent (QInputMethodEvent *)

void	inputMethodPreHandler (QInputMethodEvent *)

virtual QVariant	inputMethodQuery (Qt::InputMethodQuery query) const

bool	isComponentComplete () const
	Returns true if construction of the QML component is complete; otherwise returns false. More...

virtual QVariant	itemChange (GraphicsItemChange, const QVariant &)
	Note that unlike QGraphicsItems, QDeclarativeItem::itemChange() is not called during initial widget polishing. More...

virtual void	keyPressEvent (QKeyEvent *event)

void	keyPressPreHandler (QKeyEvent *)

virtual void	keyReleaseEvent (QKeyEvent *event)

void	keyReleasePreHandler (QKeyEvent *)

	QDeclarativeItem (QDeclarativeItemPrivate &dd, QDeclarativeItem *parent=0)

virtual bool	sceneEvent (QEvent *)

void	setImplicitHeight (qreal)
	Sets the implied height of the item to h. More...

void	setImplicitWidth (qreal)
	Sets the implied width of the item to w. More...

bool	widthValid () const
	Returns whether the width property has been set explicitly. More...

Protected Functions inherited from QGraphicsObject
	QGraphicsObject (QGraphicsItemPrivate &dd, QGraphicsItem parent, QGraphicsScene scene)

Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...

virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...

virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...

virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...

	QObject (QObjectPrivate &dd, QObject *parent=0)

int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...

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 0. More...

int	senderSignalIndex () const

virtual void	timerEvent (QTimerEvent *)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...

Protected Functions inherited from QGraphicsItem
void	addToIndex ()
	Adds this item to the scene's index. More...

virtual void	contextMenuEvent (QGraphicsSceneContextMenuEvent *event)
	This event handler can be reimplemented in a subclass to process context menu events. More...

virtual void	dragEnterEvent (QGraphicsSceneDragDropEvent *event)
	This event handler, for event event, can be reimplemented to receive drag enter events for this item. More...

virtual void	dragLeaveEvent (QGraphicsSceneDragDropEvent *event)
	This event handler, for event event, can be reimplemented to receive drag leave events for this item. More...

virtual void	dragMoveEvent (QGraphicsSceneDragDropEvent *event)
	This event handler, for event event, can be reimplemented to receive drag move events for this item. More...

virtual void	dropEvent (QGraphicsSceneDragDropEvent *event)
	This event handler, for event event, can be reimplemented to receive drop events for this item. More...

virtual QVariant	extension (const QVariant &variant) const
	Note: This is provided as a hook to avoid future problems related to adding virtual functions. More...

virtual void	focusInEvent (QFocusEvent *event)
	This event handler, for event event, can be reimplemented to receive focus in events for this item. More...

virtual void	focusOutEvent (QFocusEvent *event)
	This event handler, for event event, can be reimplemented to receive focus out events for this item. More...

virtual void	hoverEnterEvent (QGraphicsSceneHoverEvent *event)
	This event handler, for event event, can be reimplemented to receive hover enter events for this item. More...

virtual void	hoverLeaveEvent (QGraphicsSceneHoverEvent *event)
	This event handler, for event event, can be reimplemented to receive hover leave events for this item. More...

virtual void	hoverMoveEvent (QGraphicsSceneHoverEvent *event)
	This event handler, for event event, can be reimplemented to receive hover move events for this item. More...

virtual void	mouseDoubleClickEvent (QGraphicsSceneMouseEvent *event)
	This event handler, for event event, can be reimplemented to receive mouse doubleclick events for this item. More...

virtual void	mouseMoveEvent (QGraphicsSceneMouseEvent *event)
	This event handler, for event event, can be reimplemented to receive mouse move events for this item. More...

virtual void	mousePressEvent (QGraphicsSceneMouseEvent *event)
	This event handler, for event event, can be reimplemented to receive mouse press events for this item. More...

virtual void	mouseReleaseEvent (QGraphicsSceneMouseEvent *event)
	This event handler, for event event, can be reimplemented to receive mouse release events for this item. More...

void	prepareGeometryChange ()
	Prepares the item for a geometry change. More...

	QGraphicsItem (QGraphicsItemPrivate &dd, QGraphicsItem parent, QGraphicsScene scene)

void	removeFromIndex ()
	Removes this item from the scene's index. More...

virtual bool	sceneEventFilter (QGraphicsItem watched, QEvent event)
	Filters events for the item watched. More...

virtual void	setExtension (Extension extension, const QVariant &variant)
	Note: This is provided as a hook to avoid future problems related to adding virtual functions. More...

virtual bool	supportsExtension (Extension extension) const
	Note: This is provided as a hook to avoid future problems related to adding virtual functions. More...

void	updateMicroFocus ()
	Updates the item's micro focus. More...

virtual void	wheelEvent (QGraphicsSceneWheelEvent *event)
	This event handler, for event event, can be reimplemented to receive wheel events for this item. More...

Private Slots
void	changeSource (int index)

void	handleVisibilityChange ()

void	markDirty ()

Private Functions
bool	active () const

void	bindGeometry ()

void	checkViewportUpdateMode ()

void	connectPropertySignals ()

void	disconnectPropertySignals ()

void	lookThroughShaderCode (const QString &code)

void	renderEffect (QPainter *painter, const QMatrix4x4 &matrix)

void	reset ()

void	setActive (bool enable)

void	setSource (const QVariant &var, int index)

void	updateEffectState (const QMatrix4x4 &matrix)

void	updateGeometry ()

void	updateProperties ()

void	updateShaderProgram ()

Properties
bool	blending
	This property defines whether item is drawn using blending. More...

QString	fragmentShader
	This property holds the OpenGL fragment shader code. More...

bool	m_active: 1

QVector< const char * >	m_attributeNames

bool	m_blending: 1

bool	m_changed: 1

bool	m_checkedOpenGL: 1

bool	m_checkedShaderPrograms: 1

bool	m_checkedViewportUpdateMode: 1

bool	m_defaultVertexShader: 1

QString	m_fragment_code

QSGGeometry	m_geometry

bool	m_hasShaderPrograms: 1

QSize	m_meshResolution

bool	m_mirrored: 1

QGLShaderProgram *	m_program

bool	m_program_dirty: 1

bool	m_respectsMatrix: 1

bool	m_respectsOpacity: 1

QVector< SourceData >	m_sources

QSet< QByteArray >	m_uniformNames

QString	m_vertex_code

QSize	meshResolution
	This property defines to how many triangles the item is divided into before its vertices are passed to the vertex shader. More...

QString	vertexShader
	This property holds the OpenGL vertex shader code. More...

Additional Inherited Members
Public Types inherited from QDeclarativeItem
enum	TransformOrigin { TopLeft, Top, TopRight, Left, Center, Right, BottomLeft, Bottom, BottomRight }
	Controls the point about which simple transforms like scale apply. More...

Public Types inherited from QGraphicsItem
enum	{ Type = 1, UserType = 65536 }

enum	CacheMode { NoCache, ItemCoordinateCache, DeviceCoordinateCache }
	This enum describes QGraphicsItem's cache modes. More...

enum	GraphicsItemChange { ItemPositionChange, ItemMatrixChange, ItemVisibleChange, ItemEnabledChange, ItemSelectedChange, ItemParentChange, ItemChildAddedChange, ItemChildRemovedChange, ItemTransformChange, ItemPositionHasChanged, ItemTransformHasChanged, ItemSceneChange, ItemVisibleHasChanged, ItemEnabledHasChanged, ItemSelectedHasChanged, ItemParentHasChanged, ItemSceneHasChanged, ItemCursorChange, ItemCursorHasChanged, ItemToolTipChange, ItemToolTipHasChanged, ItemFlagsChange, ItemFlagsHaveChanged, ItemZValueChange, ItemZValueHasChanged, ItemOpacityChange, ItemOpacityHasChanged, ItemScenePositionHasChanged, ItemRotationChange, ItemRotationHasChanged, ItemScaleChange, ItemScaleHasChanged, ItemTransformOriginPointChange, ItemTransformOriginPointHasChanged }
	This enum describes the state changes that are notified by QGraphicsItem::itemChange(). More...

enum	GraphicsItemFlag { ItemIsMovable = 0x1, ItemIsSelectable = 0x2, ItemIsFocusable = 0x4, ItemClipsToShape = 0x8, ItemClipsChildrenToShape = 0x10, ItemIgnoresTransformations = 0x20, ItemIgnoresParentOpacity = 0x40, ItemDoesntPropagateOpacityToChildren = 0x80, ItemStacksBehindParent = 0x100, ItemUsesExtendedStyleOption = 0x200, ItemHasNoContents = 0x400, ItemSendsGeometryChanges = 0x800, ItemAcceptsInputMethod = 0x1000, ItemNegativeZStacksBehindParent = 0x2000, ItemIsPanel = 0x4000, ItemIsFocusScope = 0x8000, ItemSendsScenePositionChanges = 0x10000, ItemStopsClickFocusPropagation = 0x20000, ItemStopsFocusHandling = 0x40000 }
	This enum describes different flags that you can set on an item to toggle different features in the item's behavior. More...

enum	PanelModality { NonModal, PanelModal, SceneModal }
	This enum specifies the behavior of a modal panel. More...

Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...

Static Public Functions inherited from QObject
static bool	connect (const QObject sender, const char signal, const QObject receiver, const char member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...

static bool	connect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)

static bool	disconnect (const QObject sender, const char signal, const QObject receiver, const char member)
	Disconnects signal in object sender from method in object receiver. More...

static bool	disconnect (const QObject sender, const QMetaMethod &signal, const QObject receiver, const QMetaMethod &member)

static uint	registerUserData ()

static QString	tr (const char sourceText, const char comment=0, int n=-1)

static QString	trUtf8 (const char sourceText, const char comment=0, int n=-1)

Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...

Protected Types inherited from QGraphicsItem
enum	Extension { UserExtension = 0x80000000 }
	Note: This is provided as a hook to avoid future problems related to adding virtual functions. More...

Protected Slots inherited from QGraphicsObject
void	updateMicroFocus ()
	Updates the item's micro focus. More...

Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr

Protected Variables inherited from QGraphicsItem
QScopedPointer< QGraphicsItemPrivate >	d_ptr

Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject

Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()

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

QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()

T *	qobject_cast (QObject *object)

	QObjectList

void *	qt_find_obj_child (QObject parent, const char type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Related Functions inherited from QGraphicsItem
T	qgraphicsitem_cast (QGraphicsItem *item)

Detailed Description

The ShaderEffectItem object alters the output of given item with OpenGL shaders.

ShaderEffectItem is available in the Qt.labs.shaders 1.0 module. {Elements in the Qt.labs module are not guaranteed to remain compatible in future versions.}

This element provides preliminary support for embedding OpenGL shader code into QML, and may be heavily changed or removed in later versions.

Requirement for the use of shaders is that the application is either using Qt OpenGL graphicssystem or is using OpenGL by setting QGLWidget as the viewport to QDeclarativeView (depending on which one is the recommened way in the targeted platform).

ShaderEffectItem internal behaviour is such that during the paint event it first renders its ShaderEffectSource items into a OpenGL framebuffer object which can be used as a texture. If the ShaderEffectSource is defined to be an image, it is directly uploaded as a texture. The texture(s) containing the source pixelcontent are then bound to graphics pipeline texture units. Finally a textured mesh is passed to the vertex- and fragmentshaders which then produce the final output for the ShaderEffectItem. It is possible to alter the mesh structure by defining the amount vertices it contains, but currently it is not possible to import complex 3D-models to be used as the mesh.

It is possible to define one or more ShaderEffectItems to be a ShaderEffectSource for other ShaderEffectItems, but ShaderEffectItem should never be declared as a child element of its source item(s) because it would cause circular loop in the painting.

A standard set of vertex attributes are provided for the shaders:

qt_Vertex - The primary position of the vertex.
qt_MultiTexCoord0 - The texture co-ordinate at each vertex for texture unit 0.

Additionally following uniforms are available for shaders:

qt_Opacity - Effective opacity of the item.
qt_ModelViewProjectionMatrix - current 4x4 transformation matrix of the item.

Furthermore, it is possible to utilize automatic QML propertybinding into vertex- and fragment shader uniforms. Conversions are done according to the table below:

QML property	GLSL uniform
property double foo: 1.0	uniform highp float foo
property real foo: 1.0	uniform highp float foo
property bool foo: true	uniform bool foo
property int foo: 1	uniform int foo
property variant foo: Qt.point(1,1)	uniform highp vec2 foo
property variant foo: Qt.size(1, 1)	uniform highp vec2 foo
property variant foo: Qt.rect(1, 1, 2, 2)	uniform highp vec4 foo
property color foo: "#00000000"	uniform lowp vec4 foo
property variant foo: Qt.vector3d(1.0, 2.0, 0.0)	uniform highp vec3 foo
property variant foo: ShaderEffectSource { SourceItem: bar }	uniform lowp sampler2D foo

Note: The uniform precision definitions in the above table are not strict, it is possible to choose the uniform precision based on what is the most suitable for the shader code for that particular uniform.

The below example uses fragment shader to create simple wiggly effect to a text label.
Automatic property binding takes care of binding the properties to the uniforms if their
names are identical. ShaderEffectSource referring to textLabel is bound to sampler2D uniform inside the fragment
shader code.

import QtQuick 1.0
import Qt.labs.shaders 1.0
Rectangle {
    width: 300
    height: 300
    color: "black"
    Text {
        id: textLabel
        text: "Hello World"
        anchors.centerIn: parent
        font.pixelSize: 32
        color: "white"
    }
    ShaderEffectItem {
        property variant source: ShaderEffectSource { sourceItem: textLabel; hideSource: true }
        property real wiggleAmount: 0.005
        anchors.fill: textLabel
        fragmentShader: "
        varying highp vec2 qt_TexCoord0;
        uniform sampler2D source;
        uniform highp float wiggleAmount;
        void main(void)
        {
            highp vec2 wiggledTexCoord = qt_TexCoord0;
            wiggledTexCoord.s += sin(4.0 * 3.141592653589 * wiggledTexCoord.t) * wiggleAmount;
            gl_FragColor = texture2D(source, wiggledTexCoord.st);
        }
        "
    }
}

Definition at line 54 of file shadereffectitem.h.

Constructors and Destructors

◆ ShaderEffectItem()

ShaderEffectItem::ShaderEffectItem ( QDeclarativeItem * parent = 0 )

Definition at line 205 of file shadereffectitem.cpp.

     : QDeclarativeItem(parent)
     , m_program(0)
     , m_meshResolution(1, 1)
     , m_geometry(QSGGeometry::defaultAttributes_TexturedPoint2D(), 4)
     , m_blending(true)
     , m_program_dirty(true)
     , m_active(true)
     , m_respectsMatrix(false)
     , m_respectsOpacity(false)
     , m_checkedViewportUpdateMode(false)
     , m_checkedOpenGL(false)
     , m_checkedShaderPrograms(false)
     , m_hasShaderPrograms(false)
     , m_mirrored(false)
     , m_defaultVertexShader(true)
 {
     setFlag(QGraphicsItem::ItemHasNoContents, false);
     connect(this, SIGNAL(visibleChanged()), this, SLOT(handleVisibilityChange()));
     m_active = isVisible();
 }

◆ ~ShaderEffectItem()

ShaderEffectItem::~ShaderEffectItem ( )

Definition at line 227 of file shadereffectitem.cpp.

 {
     reset();
 }

Functions

◆ active()

bool ShaderEffectItem::active ( ) const

inlineprivate

Definition at line 112 of file shadereffectitem.h.

112 { return m_active; }

ShaderEffectItem::m_active

bool m_active

Definition: shadereffectitem.h:137

◆ activeChanged

void ShaderEffectItem::activeChanged ( )

signal

Referenced by meshResolution(), and setActive().

◆ bindGeometry()

void ShaderEffectItem::bindGeometry ( )

private

Definition at line 568 of file shadereffectitem.cpp.

Referenced by meshResolution(), and renderEffect().

 {
     if (!m_program)
         return;
 
     char const *const *attrNames = m_attributeNames.constData();
     int offset = 0;
         for (int j = 0; j < m_attributeNames.size(); ++j) {
         if (!*attrNames[j])
             continue;
         Q_ASSERT_X(j < m_geometry.attributeCount(), "ShaderEffectItem::bindGeometry()", "Geometry lacks attribute required by material");
         const QSGGeometry::Attribute &a = m_geometry.attributes()[j];
         Q_ASSERT_X(j == a.position, "ShaderEffectItem::bindGeometry()", "Geometry does not have continuous attribute positions");
 #if defined(QT_OPENGL_ES_2)
         GLboolean normalize = a.type != GL_FLOAT;
 #else
         GLboolean normalize = a.type != GL_FLOAT && a.type != GL_DOUBLE;
 #endif
         if (normalize)
             qWarning() << "ShaderEffectItem::bindGeometry() - non supported attribute type!";
 
         m_program->setAttributeArray(a.position, (GLfloat*) (((char*) m_geometry.vertexData()) + offset), a.tupleSize, m_geometry.stride());
         //glVertexAttribPointer(a.position, a.tupleSize, a.type, normalize, m_geometry.stride(), (char *) m_geometry.vertexData() + offset);
         offset += a.tupleSize * size_of_type(a.type);
     }
 }

◆ blending()

bool ShaderEffectItem::blending ( ) const

inline

Definition at line 76 of file shadereffectitem.h.

76 { return m_blending; }

ShaderEffectItem::m_blending

bool m_blending

Definition: shadereffectitem.h:135

◆ blendingChanged

void ShaderEffectItem::blendingChanged ( )

signal

Referenced by meshResolution(), and setBlending().

◆ changeSource

void ShaderEffectItem::changeSource ( int index )

privateslot

Definition at line 698 of file shadereffectitem.cpp.

Referenced by connectPropertySignals(), and meshResolution().

 {
     Q_ASSERT(index >= 0 && index < m_sources.size());
     QVariant v = property(m_sources.at(index).name.constData());
     setSource(v, index);
 }

◆ checkViewportUpdateMode()

void ShaderEffectItem::checkViewportUpdateMode ( )

private

Definition at line 364 of file shadereffectitem.cpp.

Referenced by meshResolution(), and paint().

 {
     if (!m_checkedViewportUpdateMode) {
         QGraphicsScene *s = scene();
         if (s){
             QList<QGraphicsView*> views = s->views();
             for (int i = 0; i < views.count(); i++) {
                 if (views[i]->viewportUpdateMode() != QGraphicsView::FullViewportUpdate) {
                     qWarning() << "ShaderEffectItem::checkViewportUpdateMode - consider setting QGraphicsView::FullViewportUpdate mode with OpenGL!";
                 }
             }
         }
         m_checkedViewportUpdateMode = true;
     }
 }

◆ componentComplete()

void ShaderEffectItem::componentComplete ( )

virtual

Warning: This function is not part of the public interface.

componentComplete() is called when all items in the component have been constructed. It is often desirable to delay some processing until the component is complete an all bindings in the component have been resolved.

Reimplemented from QDeclarativeItem.

Definition at line 358 of file shadereffectitem.cpp.

 {
     updateProperties();
     QDeclarativeItem::componentComplete();
 }

◆ connectPropertySignals()

void ShaderEffectItem::connectPropertySignals ( )

private

Definition at line 761 of file shadereffectitem.cpp.

Referenced by meshResolution(), and updateProperties().

 {
     QSet<QByteArray>::const_iterator it;
     for (it = m_uniformNames.begin(); it != m_uniformNames.end(); ++it) {
         int pi = metaObject()->indexOfProperty(it->constData());
         if (pi >= 0) {
             QMetaProperty mp = metaObject()->property(pi);
             if (!mp.hasNotifySignal())
                 qWarning("ShaderEffectItem: property '%s' does not have notification method!", it->constData());
             QByteArray signalName("2");
             signalName.append(mp.notifySignal().signature());
             connect(this, signalName, this, SLOT(markDirty()));
         } else {
             qWarning("ShaderEffectItem: '%s' does not have a matching property!", it->constData());
         }
     }
     for (int i = 0; i < m_sources.size(); ++i) {
         SourceData &source = m_sources[i];
         int pi = metaObject()->indexOfProperty(source.name.constData());
         if (pi >= 0) {
             QMetaProperty mp = metaObject()->property(pi);
             QByteArray signalName("2");
             signalName.append(mp.notifySignal().signature());
             connect(this, signalName, source.mapper, SLOT(map()));
             source.mapper->setMapping(this, i);
             connect(source.mapper, SIGNAL(mapped(int)), this, SLOT(changeSource(int)));
         } else {
             qWarning("ShaderEffectItem: '%s' does not have a matching source!", source.name.constData());
         }
     }
 }

◆ disconnectPropertySignals()

void ShaderEffectItem::disconnectPropertySignals ( )

private

Definition at line 751 of file shadereffectitem.cpp.

Referenced by meshResolution(), and reset().

 {
     disconnect(this, 0, this, SLOT(markDirty()));
     for (int i = 0; i < m_sources.size(); ++i) {
         SourceData &source = m_sources[i];
         disconnect(this, 0, source.mapper, 0);
         disconnect(source.mapper, 0, this, 0);
     }
 }

◆ fragmentShader()

QString ShaderEffectItem::fragmentShader ( ) const

inline

Definition at line 70 of file shadereffectitem.h.

70 { return m_fragment_code; }

ShaderEffectItem::m_fragment_code

QString m_fragment_code

Definition: shadereffectitem.h:116

◆ fragmentShaderChanged

void ShaderEffectItem::fragmentShaderChanged ( )

signal

Referenced by meshResolution(), and setFragmentShader().

◆ geometryChanged()

void ShaderEffectItem::geometryChanged	(	const QRectF &	newGeometry,
		const QRectF &	oldGeometry
	)

protectedvirtual

This function is called to handle this item's changes in geometry from oldGeometry to newGeometry.

If the two geometries are the same, it doesn't do anything.

Reimplemented from QDeclarativeItem.

Definition at line 691 of file shadereffectitem.cpp.

Referenced by meshResolution().

 {
     if (newGeometry.size() != oldGeometry.size())
         updateGeometry();
     QDeclarativeItem::geometryChanged(newGeometry, oldGeometry);
 }

◆ handleVisibilityChange

void ShaderEffectItem::handleVisibilityChange ( )

privateslot

Definition at line 935 of file shadereffectitem.cpp.

Referenced by meshResolution(), and ShaderEffectItem().

 {
     setActive(isVisible());
 }

◆ lookThroughShaderCode()

void ShaderEffectItem::lookThroughShaderCode ( const QString & code )

private

Definition at line 884 of file shadereffectitem.cpp.

Referenced by meshResolution(), and updateProperties().

 {
     // Regexp for matching attributes and uniforms.
     // In human readable form: attribute|uniform [lowp|mediump|highp] <type> <name>
     static QRegExp re(QLatin1String("\\b(attribute|uniform)\\b\\s*\\b(?:lowp|mediump|highp)?\\b\\s*\\b(\\w+)\\b\\s*\\b(\\w+)"));
     Q_ASSERT(re.isValid());
 
     int pos = -1;
 
     //QString wideCode = QString::fromLatin1(code.constData(), code.size());
     QString wideCode = code;
 
     while ((pos = re.indexIn(wideCode, pos + 1)) != -1) {
         QByteArray decl = re.cap(1).toLatin1(); // uniform or attribute
         QByteArray type = re.cap(2).toLatin1(); // type
         QByteArray name = re.cap(3).toLatin1(); // variable name
 
         if (decl == "attribute") {
             if (name == qt_postion_attribute_name) {
                 m_attributeNames.insert(0, qt_postion_attribute_name);
             } else if (name == "qt_MultiTexCoord0") {
                 if (m_attributeNames.at(0) == 0) {
                     m_attributeNames.insert(0, qt_emptyAttributeName);
                 }
                 m_attributeNames.insert(1, qt_texcoord_attribute_name);
             } else {
                 // TODO: Support user defined attributes.
                 qWarning("ShaderEffectItem: Attribute \'%s\' not recognized.", name.constData());
             }
         } else {
             Q_ASSERT(decl == "uniform");
 
             if (name == "qt_ModelViewProjectionMatrix") {
                 m_respectsMatrix = true;
             } else if (name == "qt_Opacity") {
                 m_respectsOpacity = true;
             } else {
                 m_uniformNames.insert(name);
                 if (type == "sampler2D") {
                     SourceData d;
                     d.mapper = new QSignalMapper;
                     d.source = 0;
                     d.name = name;
                     d.item = 0;
                     m_sources.append(d);
                 }
             }
         }
     }
 }

◆ markDirty

void ShaderEffectItem::markDirty ( )

privateslot

Definition at line 705 of file shadereffectitem.cpp.

Referenced by connectPropertySignals(), disconnectPropertySignals(), meshResolution(), setActive(), and setSource().

                                  {
     update();
 }

◆ meshResolution()

QSize ShaderEffectItem::meshResolution ( ) const

inline

Definition at line 79 of file shadereffectitem.h.

79 { return m_meshResolution; }

ShaderEffectItem::m_meshResolution

QSize m_meshResolution

Definition: shadereffectitem.h:121

◆ meshResolutionChanged

void ShaderEffectItem::meshResolutionChanged ( )

signal

Referenced by meshResolution(), and setMeshResolution().

◆ paint()

void ShaderEffectItem::paint	(	QPainter *	,
		const QStyleOptionGraphicsItem *	,
		QWidget *	= `0`
	)

virtual

Warning: This function is not part of the public interface.

Reimplemented from QDeclarativeItem.

Definition at line 380 of file shadereffectitem.cpp.

 {
     if (!m_active) return;
 
     const QGLContext *context = QGLContext::currentContext();
 
     if (context) {
         if (!m_checkedShaderPrograms) {
             m_hasShaderPrograms = QGLShaderProgram::hasOpenGLShaderPrograms(context);
             m_checkedShaderPrograms = true;
 
             if (!m_hasShaderPrograms)
                 qWarning() << "ShaderEffectItem::paint - Shader programs are not supported";
         }
 
         if ( !m_hasShaderPrograms )
             return;
 
         checkViewportUpdateMode();
         painter->save();
         painter->beginNativePainting();
         QMatrix4x4 combinedMatrix = QMatrix4x4(painter->transform());
         renderEffect(painter, combinedMatrix);
         painter->endNativePainting();
         painter->restore();
     } else {
         if (!m_checkedOpenGL) {
             qWarning() << "ShaderEffectItem::paint - OpenGL not available";
             m_checkedOpenGL = true;
         }
     }
 }

◆ preprocess()

void ShaderEffectItem::preprocess ( )

Definition at line 682 of file shadereffectitem.cpp.

Referenced by meshResolution().

 {
     for (int i = 0; i < m_sources.size(); ++i) {
         ShaderEffectSource *source = m_sources.at(i).source;
         if (source)
             source->updateBackbuffer();
     }
 }

◆ renderEffect()

void ShaderEffectItem::renderEffect	(	QPainter *	painter,
		const QMatrix4x4 &	matrix
	)

private

Definition at line 413 of file shadereffectitem.cpp.

Referenced by meshResolution(), and paint().

 {
     if (!painter || !painter->device())
         return;
 
     if (!m_program || !m_program->programId()) {
         // Deleted due to deactivation, to save GPU memory,
         // or invalidated due to GL context change.
         delete m_program;
         if (QGLContext::currentContext())
             m_program = new QGLShaderProgram(this);
         if (!m_program)
             qWarning() << "ShaderEffectItem::renderEffect - Creating QGLShaderProgram failed!";
     }
 
     if (!m_program)
         return;
 
     if (!m_program->isLinked() || m_program_dirty)
         updateShaderProgram();
 
     m_program->bind();
 
     QMatrix4x4 combinedMatrix;
     combinedMatrix.scale(2.0 / painter->device()->width(), -2.0 / painter->device()->height(), 1.0);
     combinedMatrix.translate(-painter->device()->width() / 2.0, -painter->device()->height() / 2.0 );
     combinedMatrix *= matrix;
     updateEffectState(combinedMatrix);
 
     for (int i = 0; i < m_attributeNames.size(); ++i) {
         m_program->enableAttributeArray(m_geometry.attributes()[i].position);
     }
 
     bindGeometry();
 
     // Optimization, disable depth test when we know we don't need it.
     if (m_defaultVertexShader) {
         glDepthMask(false);
         glDisable(GL_DEPTH_TEST);
     } else {
         glEnable(GL_DEPTH_TEST);
         glDepthFunc(GL_GREATER);
         glDepthMask(true);
 #if defined(QT_OPENGL_ES)
         glClearDepthf(0);
 #else
         glClearDepth(0);
 #endif
         glClearColor(0, 0, 0, 0);
         glClear(GL_DEPTH_BUFFER_BIT);
     }
 
     if (m_blending){
         glEnable(GL_BLEND);
         glBlendFunc (GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
     } else {
         glDisable(GL_BLEND);
     }
 
     if (m_geometry.indexCount())
         glDrawElements(m_geometry.drawingMode(), m_geometry.indexCount(), m_geometry.indexType(), m_geometry.indexData());
     else
         glDrawArrays(m_geometry.drawingMode(), 0, m_geometry.vertexCount());
 
     glDepthMask(false);
     glDisable(GL_DEPTH_TEST);
 
    for (int i = 0; i < m_attributeNames.size(); ++i)
         m_program->disableAttributeArray(m_geometry.attributes()[i].position);
 }

◆ reset()

void ShaderEffectItem::reset ( )

private

Definition at line 793 of file shadereffectitem.cpp.

Referenced by meshResolution(), setFragmentShader(), setVertexShader(), and ~ShaderEffectItem().

 {
     disconnectPropertySignals();
 
     if (m_program)
         m_program->removeAllShaders();
 
     m_attributeNames.clear();
     m_uniformNames.clear();
     for (int i = 0; i < m_sources.size(); ++i) {
         const SourceData &source = m_sources.at(i);
         if (m_active && source.source)
             source.source->derefFromEffectItem();
         delete source.mapper;
     }
 
     m_sources.clear();
     m_program_dirty = true;
 }

◆ setActive()

void ShaderEffectItem::setActive ( bool enable )

private

Definition at line 645 of file shadereffectitem.cpp.

Referenced by active(), and handleVisibilityChange().

 {
     if (m_active == enable)
         return;
 
     if (m_active) {
         for (int i = 0; i < m_sources.size(); ++i) {
             ShaderEffectSource *source = m_sources.at(i).source;
             if (!source)
                 continue;
             disconnect(source, SIGNAL(repaintRequired()), this, SLOT(markDirty()));
             source->derefFromEffectItem();
         }
     }
 
     m_active = enable;
 
     if (m_active) {
         for (int i = 0; i < m_sources.size(); ++i) {
             ShaderEffectSource *source = m_sources.at(i).source;
             if (!source)
                 continue;
             source->refFromEffectItem();
             connect(source, SIGNAL(repaintRequired()), this, SLOT(markDirty()));
         }
     }
 
     // QGLShaderProgram is deleted when not active (to minimize GPU memory usage).
     if (!m_active && m_program) {
         delete m_program;
         m_program = 0;
     }
 
     emit activeChanged();
     markDirty();
 }

◆ setBlending()

void ShaderEffectItem::setBlending ( bool enable )

Definition at line 323 of file shadereffectitem.cpp.

Referenced by blending().

 {
     if (m_blending == enable)
         return;
 
     m_blending = enable;
     m_changed = true;
     emit blendingChanged();
 }

◆ setFragmentShader()

void ShaderEffectItem::setFragmentShader ( const QString & code )

Definition at line 253 of file shadereffectitem.cpp.

Referenced by fragmentShader().

 {
     if (m_fragment_code.constData() == code.constData())
         return;
 
     m_fragment_code = code;
     if (isComponentComplete()) {
         reset();
         updateProperties();
     }
     emit fragmentShaderChanged();
 }

◆ setMeshResolution()

void ShaderEffectItem::setMeshResolution ( const QSize & size )

Definition at line 348 of file shadereffectitem.cpp.

Referenced by meshResolution().

 {
     if (size == m_meshResolution)
         return;
 
     m_meshResolution = size;
     emit meshResolutionChanged();
     updateGeometry();
 }

◆ setSource()

void ShaderEffectItem::setSource	(	const QVariant &	var,
		int	index
	)

private

Definition at line 709 of file shadereffectitem.cpp.

Referenced by changeSource(), meshResolution(), and updateProperties().

 {
     Q_ASSERT(index >= 0 && index < m_sources.size());
 
     SourceData &source = m_sources[index];
 
     source.source = 0;
     source.item = 0;
     if (var.isNull()) {
         return;
     } else if (!qVariantCanConvert<QObject *>(var)) {
         qWarning("Could not assign source of type '%s' to property '%s'.", var.typeName(), source.name.constData());
         return;
     }
 
     QObject *obj = qVariantValue<QObject *>(var);
 
     source.source = qobject_cast<ShaderEffectSource *>(obj);
     source.item = qobject_cast<QDeclarativeItem *>(obj);
 
     if (!source.item)
         qWarning("Could not assign property '%s', did not implement QDeclarativeItem.", source.name.constData());
 
     if (!source.source)
         qWarning("Could not assign property '%s', did not implement ShaderEffectSource.", source.name.constData());
 
     // TODO: Find better solution.
     // 'source.item' needs a canvas to get a scenegraph node.
     // The easiest way to make sure it gets a canvas is to
     // make it a part of the same item tree as 'this'.
     if (source.item && source.item->parentItem() == 0) {
         source.item->setParentItem(this);
         // Unlike in scenegraph, we cannot set item invisible here because qgraphicsview would optimize it away.
     }
 
     // Unlike in scenegraph, ref counting is used to optimize memory consumption. Sources themself may free fbos when not referenced.
     if (m_active && source.source) {
         source.source->refFromEffectItem();
         connect(source.source, SIGNAL(repaintRequired()), this, SLOT(markDirty()));
      }
 }

◆ setVertexShader()

void ShaderEffectItem::setVertexShader ( const QString & code )

Definition at line 286 of file shadereffectitem.cpp.

Referenced by vertexShader().

 {
     if (m_vertex_code.constData() == code.constData())
         return;
 
     m_vertex_code = code;
     m_defaultVertexShader = false;
     if (isComponentComplete()) {
         reset();
         updateProperties();
     }
     emit vertexShaderChanged();
 }

◆ updateEffectState()

void ShaderEffectItem::updateEffectState ( const QMatrix4x4 & matrix )

private

Definition at line 484 of file shadereffectitem.cpp.

Referenced by meshResolution(), and renderEffect().

 {
     if (!m_program)
         return;
 
     for (int i = m_sources.size() - 1; i >= 0; --i) {
         const ShaderEffectItem::SourceData &source = m_sources.at(i);
         if (!source.source)
             continue;
 
         glActiveTexture(GL_TEXTURE0 + i);
         source.source->bind();
     }
 
     if (m_respectsOpacity)
         m_program->setUniformValue("qt_Opacity", static_cast<float> (effectiveOpacity()));
 
     if (m_respectsMatrix){
         m_program->setUniformValue("qt_ModelViewProjectionMatrix", matrix);
     }
 
     QSet<QByteArray>::const_iterator it;
     for (it = m_uniformNames.begin(); it != m_uniformNames.end(); ++it) {
         const QByteArray &name = *it;
         QVariant v = property(name.constData());
 
         switch (v.type()) {
         case QVariant::Color:
             m_program->setUniformValue(name.constData(), qvariant_cast<QColor>(v));
             break;
         case QVariant::Double:
             m_program->setUniformValue(name.constData(), (float) qvariant_cast<double>(v));
             break;
         case QVariant::Transform:
             m_program->setUniformValue(name.constData(), qvariant_cast<QTransform>(v));
             break;
         case QVariant::Int:
             m_program->setUniformValue(name.constData(), GLint(v.toInt()));
             break;
         case QVariant::Bool:
             m_program->setUniformValue(name.constData(), GLint(v.toBool()));
             break;
         case QVariant::Size:
         case QVariant::SizeF:
             m_program->setUniformValue(name.constData(), v.toSizeF());
             break;
         case QVariant::Point:
         case QVariant::PointF:
             m_program->setUniformValue(name.constData(), v.toPointF());
             break;
         case QVariant::Rect:
         case QVariant::RectF:
         {
             QRectF r = v.toRectF();
             m_program->setUniformValue(name.constData(), r.x(), r.y(), r.width(), r.height());
         }
             break;
         case QVariant::Vector3D:
             m_program->setUniformValue(name.constData(), qvariant_cast<QVector3D>(v));
             break;
         default:
             break;
         }
     }
 }

◆ updateGeometry()

void ShaderEffectItem::updateGeometry ( )

private

Definition at line 595 of file shadereffectitem.cpp.

Referenced by geometryChanged(), meshResolution(), and setMeshResolution().

 {
     QRectF srcRect(0, 1, 1, -1);
 
     if (m_mirrored)
         srcRect = QRectF(0, 0, 1, 1);
 
     QRectF dstRect = QRectF(0,0, width(), height());
 
     int vmesh = m_meshResolution.height();
     int hmesh = m_meshResolution.width();
 
     QSGGeometry *g = &m_geometry;
     if (vmesh == 1 && hmesh == 1) {
         if (g->vertexCount() != 4)
             g->allocate(4);
         QSGGeometry::updateTexturedRectGeometry(g, dstRect, srcRect);
         return;
     }
 
     g->allocate((vmesh + 1) * (hmesh + 1), vmesh * 2 * (hmesh + 2));
 
     QSGGeometry::TexturedPoint2D *vdata = g->vertexDataAsTexturedPoint2D();
 
     for (int iy = 0; iy <= vmesh; ++iy) {
         float fy = iy / float(vmesh);
         float y = float(dstRect.top()) + fy * float(dstRect.height());
         float ty = float(srcRect.top()) + fy * float(srcRect.height());
         for (int ix = 0; ix <= hmesh; ++ix) {
             float fx = ix / float(hmesh);
             vdata->x = float(dstRect.left()) + fx * float(dstRect.width());
             vdata->y = y;
             vdata->tx = float(srcRect.left()) + fx * float(srcRect.width());
             vdata->ty = ty;
             ++vdata;
         }
     }
 
     quint16 *indices = (quint16 *)g->indexDataAsUShort();
     int i = 0;
     for (int iy = 0; iy < vmesh; ++iy) {
         *(indices++) = i + hmesh + 1;
         for (int ix = 0; ix <= hmesh; ++ix, ++i) {
             *(indices++) = i + hmesh + 1;
             *(indices++) = i;
         }
         *(indices++) = i - 1;
     }
 }

◆ updateProperties()

void ShaderEffectItem::updateProperties ( )

private

Definition at line 813 of file shadereffectitem.cpp.

Referenced by componentComplete(), meshResolution(), setFragmentShader(), and setVertexShader().

 {
     QString vertexCode = m_vertex_code;
     QString fragmentCode = m_fragment_code;
 
     if (vertexCode.isEmpty())
         vertexCode = qt_default_vertex_code;
 
     if (fragmentCode.isEmpty())
         fragmentCode = qt_default_fragment_code;
 
     lookThroughShaderCode(vertexCode);
     lookThroughShaderCode(fragmentCode);
 
     if (!m_attributeNames.contains(qt_postion_attribute_name))
         qWarning("ShaderEffectItem: Missing reference to \'%s\'.", qt_postion_attribute_name);
     if (!m_attributeNames.contains(qt_texcoord_attribute_name))
         qWarning("ShaderEffectItem: Missing reference to \'%s\'.", qt_texcoord_attribute_name);
     if (!m_respectsMatrix)
         qWarning("ShaderEffectItem: Missing reference to \'qt_ModelViewProjectionMatrix\'.");
 
     for (int i = 0; i < m_sources.size(); ++i) {
         QVariant v = property(m_sources.at(i).name);
         setSource(v, i); // Property exists.
     }
 
     connectPropertySignals();
 }

◆ updateShaderProgram()

void ShaderEffectItem::updateShaderProgram ( )

private

Definition at line 842 of file shadereffectitem.cpp.

Referenced by meshResolution(), and renderEffect().

 {
     if (!m_program)
         return;
 
     QString vertexCode = m_vertex_code;
     QString fragmentCode = m_fragment_code;
 
     if (vertexCode.isEmpty())
         vertexCode = QString::fromLatin1(qt_default_vertex_code);
 
     if (fragmentCode.isEmpty())
         fragmentCode = QString::fromLatin1(qt_default_fragment_code);
 
     m_program->addShaderFromSourceCode(QGLShader::Vertex, vertexCode);
     m_program->addShaderFromSourceCode(QGLShader::Fragment, fragmentCode);
 
     for (int i = 0; i < m_attributeNames.size(); ++i) {
         m_program->bindAttributeLocation(m_attributeNames.at(i), m_geometry.attributes()[i].position);
     }
 
     if (!m_program->link()) {
         qWarning("ShaderEffectItem: Shader compilation failed:");
         qWarning() << m_program->log();
     }
 
     if (!m_attributeNames.contains(qt_postion_attribute_name))
         qWarning("ShaderEffectItem: Missing reference to \'qt_Vertex\'.");
     if (!m_attributeNames.contains(qt_texcoord_attribute_name))
         qWarning("ShaderEffectItem: Missing reference to \'qt_MultiTexCoord0\'.");
     if (!m_respectsMatrix)
         qWarning("ShaderEffectItem: Missing reference to \'qt_ModelViewProjectionMatrix\'.");
 
     if (m_program->isLinked()) {
         m_program->bind();
         for (int i = 0; i < m_sources.size(); ++i)
             m_program->setUniformValue(m_sources.at(i).name.constData(), (GLint) i);
     }
 
     m_program_dirty = false;
 }

◆ vertexShader()

QString ShaderEffectItem::vertexShader ( ) const

inline

Definition at line 73 of file shadereffectitem.h.

73 { return m_vertex_code; }

ShaderEffectItem::m_vertex_code

QString m_vertex_code

Definition: shadereffectitem.h:117

◆ vertexShaderChanged

void ShaderEffectItem::vertexShaderChanged ( )

signal

Referenced by meshResolution(), and setVertexShader().

Properties

◆ blending

bool ShaderEffectItem::blending

private

This property defines whether item is drawn using blending.

If true, the RGBA pixel output from the fragment shader is blended with the pixel RGBA-values already in the framebuffer.

If false, fragment shader output is written to framebuffer as such.

Usually drawing without blending is slightly faster, thus disabling blending might be a good choice when item is used as a background element.

Note: By default the pixel data in textures is stored in 32-bit premultiplied alpha format. This should be taken into account when blending or reading the pixel values in the fragment shader code.

The default value is true.

Definition at line 60 of file shadereffectitem.h.

◆ fragmentShader

string ShaderEffectItem::fragmentShader

private

This property holds the OpenGL fragment shader code.

The default fragment shader is following:

varying highp vec2 qt_TexCoord0;
uniform sampler2D source;
void main(void)
{
    gl_FragColor = texture2D(source, qt_TexCoord0.st);
}

Definition at line 58 of file shadereffectitem.h.

◆ m_active

bool ShaderEffectItem::m_active

private

Definition at line 137 of file shadereffectitem.h.

Referenced by active(), paint(), reset(), setActive(), setSource(), and ShaderEffectItem().

◆ m_attributeNames

QVector<const char *> ShaderEffectItem::m_attributeNames

private

Definition at line 119 of file shadereffectitem.h.

Referenced by bindGeometry(), lookThroughShaderCode(), renderEffect(), reset(), updateProperties(), and updateShaderProgram().

◆ m_blending

bool ShaderEffectItem::m_blending

private

Definition at line 135 of file shadereffectitem.h.

Referenced by blending(), renderEffect(), and setBlending().

◆ m_changed

bool ShaderEffectItem::m_changed

private

Definition at line 134 of file shadereffectitem.h.

Referenced by setBlending().

◆ m_checkedOpenGL

bool ShaderEffectItem::m_checkedOpenGL

private

Definition at line 141 of file shadereffectitem.h.

Referenced by paint().

◆ m_checkedShaderPrograms

bool ShaderEffectItem::m_checkedShaderPrograms

private

Definition at line 142 of file shadereffectitem.h.

Referenced by paint().

◆ m_checkedViewportUpdateMode

bool ShaderEffectItem::m_checkedViewportUpdateMode

private

Definition at line 140 of file shadereffectitem.h.

Referenced by checkViewportUpdateMode().

◆ m_defaultVertexShader

bool ShaderEffectItem::m_defaultVertexShader

private

Definition at line 145 of file shadereffectitem.h.

Referenced by renderEffect(), and setVertexShader().

◆ m_fragment_code

QString ShaderEffectItem::m_fragment_code

private

Definition at line 116 of file shadereffectitem.h.

Referenced by fragmentShader(), setFragmentShader(), updateProperties(), and updateShaderProgram().

◆ m_geometry

QSGGeometry ShaderEffectItem::m_geometry

private

Definition at line 122 of file shadereffectitem.h.

Referenced by bindGeometry(), renderEffect(), updateGeometry(), and updateShaderProgram().

◆ m_hasShaderPrograms

bool ShaderEffectItem::m_hasShaderPrograms

private

Definition at line 143 of file shadereffectitem.h.

Referenced by paint().

◆ m_meshResolution

QSize ShaderEffectItem::m_meshResolution

private

Definition at line 121 of file shadereffectitem.h.

Referenced by meshResolution(), setMeshResolution(), and updateGeometry().

◆ m_mirrored

bool ShaderEffectItem::m_mirrored

private

Definition at line 144 of file shadereffectitem.h.

Referenced by updateGeometry().

◆ m_program

QGLShaderProgram* ShaderEffectItem::m_program

private

Definition at line 118 of file shadereffectitem.h.

Referenced by bindGeometry(), renderEffect(), reset(), setActive(), updateEffectState(), and updateShaderProgram().

◆ m_program_dirty

bool ShaderEffectItem::m_program_dirty

private

Definition at line 136 of file shadereffectitem.h.

Referenced by renderEffect(), reset(), and updateShaderProgram().

◆ m_respectsMatrix

bool ShaderEffectItem::m_respectsMatrix

private

Definition at line 138 of file shadereffectitem.h.

Referenced by lookThroughShaderCode(), updateEffectState(), updateProperties(), and updateShaderProgram().

◆ m_respectsOpacity

bool ShaderEffectItem::m_respectsOpacity

private

Definition at line 139 of file shadereffectitem.h.

Referenced by lookThroughShaderCode(), and updateEffectState().

◆ m_sources

QVector<SourceData> ShaderEffectItem::m_sources

private

Definition at line 132 of file shadereffectitem.h.

Referenced by changeSource(), connectPropertySignals(), disconnectPropertySignals(), lookThroughShaderCode(), preprocess(), reset(), setActive(), setSource(), updateEffectState(), updateProperties(), and updateShaderProgram().

◆ m_uniformNames

QSet<QByteArray> ShaderEffectItem::m_uniformNames

private

Definition at line 120 of file shadereffectitem.h.

Referenced by connectPropertySignals(), lookThroughShaderCode(), reset(), and updateEffectState().

◆ m_vertex_code

QString ShaderEffectItem::m_vertex_code

private

Definition at line 117 of file shadereffectitem.h.

Referenced by setVertexShader(), updateProperties(), updateShaderProgram(), and vertexShader().

◆ meshResolution

QSize ShaderEffectItem::meshResolution

private

This property defines to how many triangles the item is divided into before its vertices are passed to the vertex shader.

Triangles are defined as triangle strips and the amount of triangles can be controlled separately for x and y-axis.

The default value is QSize(1,1).

Definition at line 61 of file shadereffectitem.h.

◆ vertexShader

string ShaderEffectItem::vertexShader

private

This property holds the OpenGL vertex shader code.

The default vertex shader is following:

uniform highp mat4 qt_ModelViewProjectionMatrix;
attribute highp vec4 qt_Vertex;
attribute highp vec2 qt_MultiTexCoord0;
varying highp vec2 qt_TexCoord0;
void main(void)
{
    qt_TexCoord0 = qt_MultiTexCoord0;
    gl_Position = qt_ModelViewProjectionMatrix * qt_Vertex;
}

Definition at line 59 of file shadereffectitem.h.

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

/src/imports/shaders/shadereffectitem.h
/src/imports/shaders/shadereffectitem.cpp

Classes

Signals

Public Functions

Protected Functions

Private Slots

Private Functions

Properties

Additional Inherited Members

Detailed Description

Constructors and Destructors

◆ ShaderEffectItem()

◆ ~ShaderEffectItem()

Functions

◆ active()

◆ activeChanged

◆ bindGeometry()

◆ blending()

◆ blendingChanged

◆ changeSource

◆ checkViewportUpdateMode()

◆ componentComplete()

◆ connectPropertySignals()

◆ disconnectPropertySignals()

◆ fragmentShader()

◆ fragmentShaderChanged

◆ geometryChanged()

◆ handleVisibilityChange

◆ lookThroughShaderCode()

◆ markDirty

◆ meshResolution()

◆ meshResolutionChanged

◆ paint()

◆ preprocess()

◆ renderEffect()

◆ reset()

◆ setActive()

◆ setBlending()

◆ setFragmentShader()

◆ setMeshResolution()

◆ setSource()

◆ setVertexShader()

◆ updateEffectState()

◆ updateGeometry()

◆ updateProperties()

◆ updateShaderProgram()

◆ vertexShader()

◆ vertexShaderChanged

Properties

◆ blending

◆ fragmentShader

◆ m_active

◆ m_attributeNames

◆ m_blending

◆ m_changed

◆ m_checkedOpenGL

◆ m_checkedShaderPrograms

◆ m_checkedViewportUpdateMode

◆ m_defaultVertexShader

◆ m_fragment_code

◆ m_geometry

◆ m_hasShaderPrograms

◆ m_meshResolution

◆ m_mirrored

◆ m_program

◆ m_program_dirty

◆ m_respectsMatrix

◆ m_respectsOpacity

◆ m_sources

◆ m_uniformNames

◆ m_vertex_code

◆ meshResolution

◆ vertexShader