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java.lang.Objectcom.trolltech.qt.QSignalEmitter
com.trolltech.qt.QtJambiObject
com.trolltech.qt.core.QObject
com.trolltech.qt.gui.QWidget
com.trolltech.qt.opengl.QGLWidget
public class QGLWidget
The QGLWidget class is a widget for rendering OpenGL graphics.
QGLWidget provides functionality for displaying OpenGL graphics integrated into a Qt application. It is very simple to use. You 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.
QGLWidget provides three convenient virtual functions that you can reimplement in your subclass to perform the typical OpenGL tasks:
Here is a rough outline of how a QGLWidget subclass might look:
class MyGLDrawer : public QGLWidget { Q_OBJECT // must include this if you use Qt signals/slots public: MyGLDrawer(QWidget *parent) : QGLWidget(parent) {} protected: void initializeGL() { // Set up the rendering context, define display lists etc.: ... glClearColor(0.0, 0.0, 0.0, 0.0); glEnable(GL_DEPTH_TEST); ... } void resizeGL(int w, int h) { // setup viewport, projection etc.: glViewport(0, 0, (GLint)w, (GLint)h); ... glFrustum(...); ... } void paintGL() { // draw the scene: ... glRotatef(...); glMaterialfv(...); glBegin(GL_QUADS); glVertex3f(...); glVertex3f(...); ... glEnd(); ... } };
If you need to trigger a repaint from places other than paintGL (a typical example is when using timers to animate scenes), you should call the widget's updateGL function.
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.
QGLWidget provides functions for requesting a new display format and you can also create widgets with customized rendering contexts.
You can also share OpenGL display lists between QGLWidgets (see the documentation of the QGLWidget constructors for details).
The QGLWidget creates a GL overlay context in addition to the normal context if overlays are supported by the underlying system.
If you want to use overlays, you specify it in the format. (Note: Overlay must be requested in the format passed to the QGLWidget constructor.) Your GL widget should also implement some or all of these virtual methods:
These methods work in the same way as the normal paintGL etc. functions, except that they will be called when the overlay context is made current. You can explicitly make the overlay context current by using makeOverlayCurrent, and you can access the overlay context directly (e.g. to ask for its transparent color) by calling overlayContext.
On X servers in which the default visual is in an overlay plane, non-GL Qt windows can also be used for overlays.
As described above, subclass QGLWidget to render pure 3D content in the following way:
It is also possible to draw 2D graphics onto a QGLWidget subclass, it is necessary to reimplement QGLWidget::paintEvent() and do the following:
Overpainting 2D content on top of 3D content takes a little more effort. One approach to doing this is shown in the Overpainting example.
OpenGL is a trademark of Silicon Graphics, Inc. in the United States and other countries.
GL Example
,
Painting Example
,
Example
,
Example
Nested Class Summary |
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Nested classes/interfaces inherited from class com.trolltech.qt.gui.QWidget |
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QWidget.RenderFlag, QWidget.RenderFlags |
Nested classes/interfaces inherited from class com.trolltech.qt.QSignalEmitter |
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QSignalEmitter.AbstractSignal, QSignalEmitter.Signal0, QSignalEmitter.Signal1<A>, QSignalEmitter.Signal2<A,B>, QSignalEmitter.Signal3<A,B,C>, QSignalEmitter.Signal4<A,B,C,D>, QSignalEmitter.Signal5<A,B,C,D,E>, QSignalEmitter.Signal6<A,B,C,D,E,F>, QSignalEmitter.Signal7<A,B,C,D,E,F,G>, QSignalEmitter.Signal8<A,B,C,D,E,F,G,H>, QSignalEmitter.Signal9<A,B,C,D,E,F,G,H,I> |
Field Summary |
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Fields inherited from class com.trolltech.qt.gui.QWidget |
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customContextMenuRequested |
Constructor Summary | |
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QGLWidget()
Equivalent to QGLWidget(0, 0, 0). |
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QGLWidget(QGLContext context)
Equivalent to QGLWidget(context, 0, 0, 0). |
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QGLWidget(QGLContext context,
QWidget parent)
Equivalent to QGLWidget(context, parent, 0, 0). |
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QGLWidget(QGLContext context,
QWidget parent,
QGLWidget shareWidget)
Equivalent to QGLWidget(context, parent, shareWidget, 0). |
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QGLWidget(QGLContext context,
QWidget parent,
QGLWidget shareWidget,
Qt.WindowFlags f)
Constructs an OpenGL widget with parent parent. |
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QGLWidget(QGLFormat format)
Equivalent to QGLWidget(format, 0, 0, 0). |
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QGLWidget(QGLFormat format,
QWidget parent)
Equivalent to QGLWidget(format, parent, 0, 0). |
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QGLWidget(QGLFormat format,
QWidget parent,
QGLWidget shareWidget)
Equivalent to QGLWidget(format, parent, shareWidget, 0). |
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QGLWidget(QGLFormat format,
QWidget parent,
QGLWidget shareWidget,
Qt.WindowFlags f)
Constructs an OpenGL widget with parent parent. |
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QGLWidget(QWidget parent)
Equivalent to QGLWidget(parent, 0, 0). |
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QGLWidget(QWidget parent,
QGLWidget shareWidget)
Equivalent to QGLWidget(parent, shareWidget, 0). |
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QGLWidget(QWidget parent,
QGLWidget shareWidget,
Qt.WindowFlags f)
Constructs an OpenGL widget with a parent widget. |
Method Summary | |
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protected boolean |
autoBufferSwap()
Returns true if the widget is doing automatic GL buffer swapping; otherwise returns false. |
int |
bindTexture(QImage image)
Equivalent to bindTexture(image, GL_TEXTURE_2D, GL_RGBA). |
int |
bindTexture(QImage image,
int target)
Equivalent to bindTexture(image, target, GL_RGBA). |
int |
bindTexture(QImage image,
int target,
int format)
Calls QGLContext:::bindTexture(image, target, format) on the currently set context. |
int |
bindTexture(QPixmap pixmap)
Equivalent to bindTexture(pixmap, GL_TEXTURE_2D, GL_RGBA). |
int |
bindTexture(QPixmap pixmap,
int target)
Equivalent to bindTexture(pixmap, target, GL_RGBA). |
int |
bindTexture(QPixmap pixmap,
int target,
int format)
Calls QGLContext:::bindTexture(pixmap, target, format) on the currently set context. |
int |
bindTexture(java.lang.String fileName)
Calls QGLContext::bindTexture(fileName) on the currently set context. |
QGLColormap |
colormap()
Returns the colormap for this widget. |
QGLContext |
context()
Returns the context of this widget. |
static QImage |
convertToGLFormat(QImage img)
Converts the image img into the unnamed format expected by OpenGL functions such as glTexImage2D(). |
void |
deleteTexture(int tx_id)
Calls QGLContext::deleteTexture(tx_id) on the currently set context. |
void |
doneCurrent()
Makes no GL context the current context. |
boolean |
doubleBuffer()
Returns true if the contained GL rendering context has double buffering; otherwise returns false. |
boolean |
event(QEvent arg__1)
This function is reimplemented for internal reasons. |
QGLFormat |
format()
Returns the format of the contained GL rendering context. |
static QGLWidget |
fromNativePointer(QNativePointer nativePointer)
This function returns the QGLWidget instance pointed to by nativePointer |
protected void |
glDraw()
Executes the virtual function paintGL. |
protected void |
glInit()
Initializes OpenGL for this widget's context. |
QImage |
grabFrameBuffer()
Equivalent to grabFrameBuffer(false). |
QImage |
grabFrameBuffer(boolean withAlpha)
Returns an image of the frame buffer. |
protected void |
initializeGL()
This virtual function is called once before the first call to paintGL or resizeGL, and then once whenever the widget has been assigned a new QGLContext. |
protected void |
initializeOverlayGL()
This virtual function is used in the same manner as initializeGL except that it operates on the widget's overlay context instead of the widget's main context. |
boolean |
isSharing()
Returns true if this widget's GL context is shared with another GL context, otherwise false is returned. |
boolean |
isValid()
Returns true if the widget has a valid GL rendering context; otherwise returns false. |
void |
makeCurrent()
Makes this widget the current widget for OpenGL operations, i.e. makes the widget's rendering context the current OpenGL rendering context. |
void |
makeOverlayCurrent()
Makes the overlay context of this widget current. |
QGLContext |
overlayContext()
Returns the overlay context of this widget, or 0 if this widget has no overlay. |
QPaintEngine |
paintEngine()
This function is reimplemented for internal reasons. |
protected void |
paintEvent(QPaintEvent arg__1)
Handles paint events passed in the arg__1 parameter. |
protected void |
paintGL()
This virtual function is called whenever the widget needs to be painted. |
protected void |
paintOverlayGL()
This virtual function is used in the same manner as paintGL except that it operates on the widget's overlay context instead of the widget's main context. |
void |
qglClearColor(QColor c)
Convenience function for specifying the clearing color to OpenGL. |
void |
qglColor(QColor c)
Convenience function for specifying a drawing color to OpenGL. |
QPixmap |
renderPixmap()
Equivalent to renderPixmap(0, 0, false). |
QPixmap |
renderPixmap(int w)
Equivalent to renderPixmap(w, 0, false). |
QPixmap |
renderPixmap(int w,
int h)
Equivalent to renderPixmap(w, h, false). |
QPixmap |
renderPixmap(int w,
int h,
boolean useContext)
Renders the current scene on a pixmap and returns the pixmap. |
void |
renderText(double x,
double y,
double z,
java.lang.String str)
Equivalent to renderText(x, y, z, str, QFont(), 2000). |
void |
renderText(double x,
double y,
double z,
java.lang.String str,
QFont fnt)
Equivalent to renderText(x, y, z, str, fnt, 2000). |
void |
renderText(double x,
double y,
double z,
java.lang.String str,
QFont fnt,
int listBase)
x, y and z are specified in scene or object coordinates relative to the currently set projection and model matrices. |
void |
renderText(int x,
int y,
java.lang.String str)
Equivalent to renderText(x, y, str, QFont(), 2000). |
void |
renderText(int x,
int y,
java.lang.String str,
QFont fnt)
Equivalent to renderText(x, y, str, fnt, 2000). |
void |
renderText(int x,
int y,
java.lang.String str,
QFont fnt,
int listBase)
Renders the string str into the GL context of this widget. |
protected void |
resizeEvent(QResizeEvent arg__1)
Handles resize events that are passed in the arg__1 parameter. |
protected void |
resizeGL(int w,
int h)
This virtual function is called whenever the widget has been resized. |
protected void |
resizeOverlayGL(int w,
int h)
This virtual function is used in the same manner as paintGL except that it operates on the widget's overlay context instead of the widget's main context. |
protected void |
setAutoBufferSwap(boolean on)
If on is true automatic GL buffer swapping is switched on; otherwise it is switched off. |
void |
setColormap(QGLColormap map)
Set the colormap for this widget to map. |
void |
swapBuffers()
Swaps the screen contents with an off-screen buffer. |
void |
updateGL()
Updates the widget by calling glDraw. |
void |
updateOverlayGL()
Updates the widget's overlay (if any). |
Methods inherited from class com.trolltech.qt.core.QObject |
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blockSignals, childEvent, children, connectSlotsByName, customEvent, disposeLater, dumpObjectInfo, dumpObjectTree, dynamicPropertyNames, eventFilter, findChild, findChild, findChild, findChildren, findChildren, findChildren, findChildren, installEventFilter, isWidgetType, killTimer, moveToThread, objectName, parent, property, removeEventFilter, setObjectName, setParent, setProperty, signalsBlocked, startTimer, thread, timerEvent |
Methods inherited from class com.trolltech.qt.QtJambiObject |
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dispose, disposed, finalize, reassignNativeResources, tr, tr, tr |
Methods inherited from class com.trolltech.qt.QSignalEmitter |
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disconnect, disconnect, signalSender |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Methods inherited from interface com.trolltech.qt.QtJambiInterface |
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disableGarbageCollection, nativeId, nativePointer, reenableGarbageCollection, setJavaOwnership |
Constructor Detail |
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public QGLWidget(QGLContext context, QWidget parent, QGLWidget shareWidget)
Equivalent to QGLWidget(context, parent, shareWidget, 0).
public QGLWidget(QGLContext context, QWidget parent)
Equivalent to QGLWidget(context, parent, 0, 0).
public QGLWidget(QGLContext context)
Equivalent to QGLWidget(context, 0, 0, 0).
public QGLWidget(QGLContext context, QWidget parent, QGLWidget shareWidget, Qt.WindowFlags f)
Constructs an OpenGL widget with parent parent.
The context argument is a pointer to the QGLContext that you wish to be bound to this widget. This allows you to pass in your own QGLContext sub-classes.
The widget will be invalid if the system has no OpenGL support.
The parent and widget flag, f, arguments are passed to the QWidget constructor.
If shareWidget is a valid QGLWidget, this widget will share OpenGL display lists and texture objects with shareWidget. But if shareWidget and this widget have different formats, sharing might not be possible. You can check whether sharing is in effect by calling isSharing.
The initialization of OpenGL rendering state, etc. should be done by overriding the initializeGL function, rather than in the constructor of your QGLWidget subclass.
public QGLWidget(QGLFormat format, QWidget parent, QGLWidget shareWidget)
Equivalent to QGLWidget(format, parent, shareWidget, 0).
public QGLWidget(QGLFormat format, QWidget parent)
Equivalent to QGLWidget(format, parent, 0, 0).
public QGLWidget(QGLFormat format)
Equivalent to QGLWidget(format, 0, 0, 0).
public QGLWidget(QGLFormat format, QWidget parent, QGLWidget shareWidget, Qt.WindowFlags f)
Constructs an OpenGL widget with parent parent.
The format argument specifies the desired rendering options. If the underlying OpenGL/Window system cannot satisfy all the features requested in format, the nearest subset of features will be used. After creation, the format method will return the actual format obtained.
The widget will be invalid if the system has no OpenGL support.
The parent and widget flag, f, arguments are passed to the QWidget constructor.
If shareWidget is a valid QGLWidget, this widget will share OpenGL display lists and texture objects with shareWidget. But if shareWidget and this widget have different formats, sharing might not be possible. You can check whether sharing is in effect by calling isSharing.
The initialization of OpenGL rendering state, etc. should be done by overriding the initializeGL function, rather than in the constructor of your QGLWidget subclass.
public QGLWidget(QWidget parent, QGLWidget shareWidget)
Equivalent to QGLWidget(parent, shareWidget, 0).
public QGLWidget(QWidget parent)
Equivalent to QGLWidget(parent, 0, 0).
public QGLWidget()
Equivalent to QGLWidget(0, 0, 0).
public QGLWidget(QWidget parent, QGLWidget shareWidget, Qt.WindowFlags f)
Constructs an OpenGL widget with a parent widget.
The default format is used. The widget will be invalid if the system has no OpenGL support.
The parent and widget flag, f, arguments are passed to the QWidget constructor.
If shareWidget is a valid QGLWidget, this widget will share OpenGL display lists and texture objects with shareWidget. But if shareWidget and this widget have different formats, sharing might not be possible. You can check whether sharing is in effect by calling isSharing.
The initialization of OpenGL rendering state, etc. should be done by overriding the initializeGL function, rather than in the constructor of your QGLWidget subclass.
Example
Method Detail |
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protected final boolean autoBufferSwap()
Returns true if the widget is doing automatic GL buffer swapping; otherwise returns false.
public final int bindTexture(java.lang.String fileName)
Calls QGLContext::bindTexture(fileName) on the currently set context.
public final int bindTexture(QImage image, int target)
Equivalent to bindTexture(image, target, GL_RGBA).
public final int bindTexture(QImage image)
Equivalent to bindTexture(image, GL_TEXTURE_2D, GL_RGBA).
public final int bindTexture(QImage image, int target, int format)
Calls QGLContext:::bindTexture(image, target, format) on the currently set context.
public final int bindTexture(QPixmap pixmap, int target)
Equivalent to bindTexture(pixmap, target, GL_RGBA).
public final int bindTexture(QPixmap pixmap)
Equivalent to bindTexture(pixmap, GL_TEXTURE_2D, GL_RGBA).
public final int bindTexture(QPixmap pixmap, int target, int format)
Calls QGLContext:::bindTexture(pixmap, target, format) on the currently set context.
public final QGLColormap colormap()
Returns the colormap for this widget.
Usually it is only top-level widgets that can have different colormaps installed. Asking for the colormap of a child widget will return the colormap for the child's top-level widget.
If no colormap has been set for this widget, the QColormap returned will be empty.
public final QGLContext context()
Returns the context of this widget.
It is possible that the context is not valid (see isValid), for example, if the underlying hardware does not support the format attributes that were requested.
public final void deleteTexture(int tx_id)
Calls QGLContext::deleteTexture(tx_id) on the currently set context.
public final void doneCurrent()
Makes no GL context the current context. Normally, you do not need to call this function; QGLContext calls it as necessary. However, it may be useful in multithreaded environments.
public final boolean doubleBuffer()
Returns true if the contained GL rendering context has double buffering; otherwise returns false.
public final QGLFormat format()
Returns the format of the contained GL rendering context.
public final QImage grabFrameBuffer()
Equivalent to grabFrameBuffer(false).
public final QImage grabFrameBuffer(boolean withAlpha)
Returns an image of the frame buffer. If withAlpha is true the alpha channel is included.
Depending on your hardware, you can explicitly select which color buffer to grab with a glReadBuffer() call before calling this function.
public final boolean isSharing()
Returns true if this widget's GL context is shared with another GL context, otherwise false is returned. Context sharing might not be possible if the QGLWidgets use different formats.
public final boolean isValid()
Returns true if the widget has a valid GL rendering context; otherwise returns false. A widget will be invalid if the system has no OpenGL support.
public final void makeCurrent()
Makes this widget the current widget for OpenGL operations, i.e. makes the widget's rendering context the current OpenGL rendering context.
public final void makeOverlayCurrent()
Makes the overlay context of this widget current. Use this if you need to issue OpenGL commands to the overlay context outside of initializeOverlayGL, resizeOverlayGL, and paintOverlayGL.
Does nothing if this widget has no overlay.
public final QGLContext overlayContext()
Returns the overlay context of this widget, or 0 if this widget has no overlay.
public final void qglClearColor(QColor c)
Convenience function for specifying the clearing color to OpenGL. Calls glClearColor (in RGBA mode) or glClearIndex (in color-index mode) with the color c. Applies to this widgets GL context.
public final void qglColor(QColor c)
Convenience function for specifying a drawing color to OpenGL. Calls glColor4 (in RGBA mode) or glIndex (in color-index mode) with the color c. Applies to this widgets GL context.
public final QPixmap renderPixmap(int w, int h)
Equivalent to renderPixmap(w, h, false).
public final QPixmap renderPixmap(int w)
Equivalent to renderPixmap(w, 0, false).
public final QPixmap renderPixmap()
Equivalent to renderPixmap(0, 0, false).
public final QPixmap renderPixmap(int w, int h, boolean useContext)
Renders the current scene on a pixmap and returns the pixmap.
You can use this method on both visible and invisible QGLWidgets.
This method will create a pixmap and a temporary QGLContext to render on the pixmap. It will then call initializeGL, resizeGL, and paintGL on this context. Finally, the widget's original GL context is restored.
The size of the pixmap will be w pixels wide and h pixels high unless one of these parameters is 0 (the default), in which case the pixmap will have the same size as the widget.
If useContext is true, this method will try to be more efficient by using the existing GL context to render the pixmap. The default is false. Only use true if you understand the risks. Note that under Windows a temporary context has to be created and usage of the useContext parameter is not supported.
Overlays are not rendered onto the pixmap.
If the GL rendering context and the desktop have different bit depths, the result will most likely look surprising.
Note that the creation of display lists, modifications of the view frustum etc. should be done from within initializeGL. If this is not done, the temporary QGLContext will not be initialized properly, and the rendered pixmap may be incomplete/corrupted.
public final void renderText(double x, double y, double z, java.lang.String str, QFont fnt)
Equivalent to renderText(x, y, z, str, fnt, 2000).
public final void renderText(double x, double y, double z, java.lang.String str)
Equivalent to renderText(x, y, z, str, QFont(), 2000).
public final void renderText(double x, double y, double z, java.lang.String str, QFont fnt, int listBase)
x, y and z are specified in scene or object coordinates relative to the currently set projection and model matrices. This can be useful if you want to annotate models with text labels and have the labels move with the model as it is rotated etc.
Note that this function only works properly if GL_DEPTH_TEST is enabled, and you have a properly initialized depth buffer.
public final void renderText(int x, int y, java.lang.String str, QFont fnt)
Equivalent to renderText(x, y, str, fnt, 2000).
public final void renderText(int x, int y, java.lang.String str)
Equivalent to renderText(x, y, str, QFont(), 2000).
public final void renderText(int x, int y, java.lang.String str, QFont fnt, int listBase)
Renders the string str into the GL context of this widget.
x and y are specified in window coordinates, with the origin in the upper left-hand corner of the window. If fnt is not specified, the currently set application font will be used to render the string. To change the color of the rendered text you can use the glColor() call (or the qglColor convenience function), just before the renderText call.
The listBase parameter is obsolete and will be removed in a future version of Qt.
protected final void setAutoBufferSwap(boolean on)
If on is true automatic GL buffer swapping is switched on; otherwise it is switched off.
If on is true and the widget is using a double-buffered format, the background and foreground GL buffers will automatically be swapped after each paintGL call.
The buffer auto-swapping is on by default.
public final void setColormap(QGLColormap map)
Set the colormap for this widget to map. Usually it is only top-level widgets that can have colormaps installed.
public final void swapBuffers()
Swaps the screen contents with an off-screen buffer. This only works if the widget's format specifies double buffer mode.
Normally, there is no need to explicitly call this function because it is done automatically after each widget repaint, i.e. each time after paintGL has been executed.
public boolean event(QEvent arg__1)
This function is reimplemented for internal reasons.
event
in class QWidget
protected void glDraw()
Executes the virtual function paintGL.
The widget's rendering context will become the current context and initializeGL will be called if it hasn't already been called.
protected void glInit()
Initializes OpenGL for this widget's context. Calls the virtual function initializeGL.
protected void initializeGL()
This virtual function is called once before the first call to paintGL or resizeGL, and then once whenever the widget has been assigned a new QGLContext. Reimplement it in a subclass.
This function should set up any required OpenGL context rendering flags, defining display lists, etc.
There is no need to call makeCurrent because this has already been done when this function is called.
protected void initializeOverlayGL()
This virtual function is used in the same manner as initializeGL except that it operates on the widget's overlay context instead of the widget's main context. This means that initializeOverlayGL is called once before the first call to paintOverlayGL or resizeOverlayGL. Reimplement it in a subclass.
This function should set up any required OpenGL context rendering flags, defining display lists, etc. for the overlay context.
There is no need to call makeOverlayCurrent because this has already been done when this function is called.
public QPaintEngine paintEngine()
This function is reimplemented for internal reasons.
paintEngine
in interface QPaintDeviceInterface
paintEngine
in class QWidget
protected void paintEvent(QPaintEvent arg__1)
Handles paint events passed in the arg__1 parameter. Will cause the virtual paintGL function to be called.
The widget's rendering context will become the current context and initializeGL will be called if it hasn't already been called.
paintEvent
in class QWidget
protected void paintGL()
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.
protected void paintOverlayGL()
This virtual function is used in the same manner as paintGL except that it operates on the widget's overlay context instead of the widget's main context. This means that paintOverlayGL is called whenever the widget's overlay needs to be painted. Reimplement it in a subclass.
There is no need to call makeOverlayCurrent because this has already been done when this function is called.
protected void resizeEvent(QResizeEvent arg__1)
Handles resize events that are passed in the arg__1 parameter. Calls the virtual function resizeGL.
resizeEvent
in class QWidget
Example
protected void resizeGL(int w, int h)
This virtual function is called whenever the widget has been resized. The new size is passed in w and h. Reimplement it in a subclass.
There is no need to call makeCurrent because this has already been done when this function is called.
protected void resizeOverlayGL(int w, int h)
This virtual function is used in the same manner as paintGL except that it operates on the widget's overlay context instead of the widget's main context. This means that resizeOverlayGL is called whenever the widget has been resized. The new size is passed in w and h. Reimplement it in a subclass.
There is no need to call makeOverlayCurrent because this has already been done when this function is called.
public void updateGL()
Updates the widget by calling glDraw.
public void updateOverlayGL()
Updates the widget's overlay (if any). Will cause the virtual function paintOverlayGL to be executed.
The widget's rendering context will become the current context and initializeGL will be called if it hasn't already been called.
public static QImage convertToGLFormat(QImage img)
Converts the image img into the unnamed format expected by OpenGL functions such as glTexImage2D(). The returned image is not usable as a QImage, but QImage::width(), QImage::height() and QImage::bits() may be used with OpenGL.
public static QGLWidget fromNativePointer(QNativePointer nativePointer)
nativePointer
- the QNativePointer of which object should be returned.
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