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The SoQtGLWidget class manages OpenGL contexts.This is the basic, abstract component class which sets up an OpenGL canvas for its subclasses. More...
#include <Inventor/Qt/SoQtGLWidget.h>
Public Member Functions | |
virtual SoType | getTypeId (void) const |
void | setBorder (const SbBool enable) |
SbBool | isBorder (void) const |
virtual void | setDoubleBuffer (const SbBool enable) |
SbBool | isDoubleBuffer (void) const |
void | setDrawToFrontBufferEnable (const SbBool enable) |
SbBool | isDrawToFrontBufferEnable (void) const |
void | setQuadBufferStereo (const SbBool enable) |
SbBool | isQuadBufferStereo (void) const |
void | setAccumulationBuffer (const SbBool enable) |
SbBool | getAccumulationBuffer (void) const |
void | setStencilBuffer (const SbBool enable) |
SbBool | getStencilBuffer (void) const |
void | setAlphaChannel (const SbBool enable) |
SbBool | getAlphaChannel (void) const |
void | setOverlayRender (const SbBool onoff) |
SbBool | isOverlayRender (void) const |
void | setStealFocus (SbBool enable) |
SbBool | isStealFocus (void) const |
QWidget * | getGLWidget (void) const |
QWidget * | getNormalWidget (void) const |
QWidget * | getOverlayWidget (void) const |
SbBool | hasOverlayGLArea (void) const |
SbBool | hasNormalGLArea (void) const |
unsigned long | getOverlayTransparentPixel (void) |
void | getPointSizeLimits (SbVec2f &range, float &granularity) |
void | getLineWidthLimits (SbVec2f &range, float &granularity) |
Static Public Member Functions | |
static void | initClass (void) |
static SoType | getClassTypeId (void) |
Protected Member Functions | |
SoQtGLWidget (QWidget *const parent=NULL, const char *const name=NULL, const SbBool embed=TRUE, const int glmodes=SO_GL_RGB, const SbBool build=TRUE) | |
~SoQtGLWidget () | |
virtual void | processEvent (QEvent *event) |
QWidget * | buildWidget (QWidget *parent) |
virtual void | redraw (void)=0 |
virtual void | redrawOverlay (void) |
virtual void | initGraphic (void) |
virtual void | initOverlayGraphic (void) |
virtual void | sizeChanged (const SbVec2s &size) |
virtual void | widgetChanged (QWidget *w) |
void | setGLSize (const SbVec2s size) |
SbVec2s | getGLSize (void) const |
float | getGLAspectRatio (void) const |
void | setGlxSize (const SbVec2s size) |
SbVec2s | getGlxSize (void) const |
float | getGlxAspectRatio (void) const |
void | setStereoBuffer (SbBool flag) |
SbBool | isStereoBuffer (void) const |
SbBool | isRGBMode (void) |
void | glLockNormal (void) |
void | glUnlockNormal (void) |
void | glLockOverlay (void) |
void | glUnlockOverlay (void) |
void | glSwapBuffers (void) |
void | glFlushBuffer (void) |
virtual SbBool | glScheduleRedraw (void) |
Protected Attributes | |
SbBool | waitForExpose |
SbBool | drawToFrontBuffer |
Friends | |
class | SoGuiGLWidgetP |
class | SoQtGLWidgetP |
The SoQtGLWidget class manages OpenGL contexts.
This is the basic, abstract component class which sets up an OpenGL canvas for its subclasses.
Application programmers will normally not use this class directly, but rather through the interface of either its direct descendent; SoQtRenderArea, or through one of the "rapid application development"-style viewer subclasses.
An important thing to know about embedding SoQtGLWidget derived components into other Qt widgets is that you need to set up "focus proxying" to have events still be sent to the OpenGL canvas widget. This is true for both the SoQtRenderArea aswell as all the viewer components (like SoQtExaminerViewer, SoQtPlaneViewer etc).
As an example, if you embed an SoQtExaminerViewer inside a QFrame like this:
QMainWindow * toplevel = new QMainWindow; QFrame * frame = new QFrame(toplevel); SoQtExaminerViewer * viewer = new SoQtExaminerViewer(toplevel);
...events from the keyboard will not always automatically be forwarded to the viewer OpenGL canvas. This is the code you need to add in this case:
toplevel->setFocusProxy(viewer->getWidget());
SoQtGLWidget::SoQtGLWidget | ( | QWidget *const | parent = NULL , |
|
const char *const | name = NULL , |
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const SbBool | embed = TRUE , |
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const int | glmodes = SO_GL_RGB , |
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const SbBool | build = TRUE | |||
) | [protected] |
The constructor is protected, as this is an abstract class to only be used by it's subclasses.
References buildWidget(), SoQtComponent::getParentWidget(), SoQtComponent::setBaseWidget(), and SoQtComponent::setClassName().
SoQtGLWidget::~SoQtGLWidget | ( | ) | [protected] |
Clean up all use of internal resources.
The destructor is protected, as this is an abstract class to only be used by it's subclasses.
References SoQtComponent::unregisterWidget().
static void SoQtGLWidget::initClass | ( | void | ) | [static] |
Sets up initialization for data common to all instances of this class, submitting necessary information to the internal SoQt type system.
Reimplemented from SoQtComponent.
Reimplemented in SoQtRenderArea, SoQtViewer, SoQtFullViewer, SoQtPlaneViewer, SoQtExaminerViewer, SoQtConstrainedViewer, and SoQtFlyViewer.
static SoType SoQtGLWidget::getClassTypeId | ( | void | ) | [static] |
This static method returns the SoType object associated with objects of this class.
Reimplemented from SoQtComponent.
Reimplemented in SoQtRenderArea, SoQtViewer, SoQtFullViewer, SoQtPlaneViewer, SoQtExaminerViewer, SoQtConstrainedViewer, and SoQtFlyViewer.
virtual SoType SoQtGLWidget::getTypeId | ( | void | ) | const [virtual] |
Returns the type identification of an object derived from a class inheriting SoQtObject. This is used for run-time type checking and "downward" casting.
Usage example:
void foo(SoQtViewer * comp) { if (comp->getTypeId() == SoQtExaminerViewer::getClassTypeId()) { // safe downward cast, knows the type SoQtExaminerViewer * exviewer = (SoQtExaminerViewer *)comp; } else if (comp->getTypeId().isOfType(SoQtFlyViewer::getClassTypeId())) { // safe downward cast, knows the type SoQtFlyViewer * flyviewer = (SoQtFlyViewer *)comp; // then something else } }
Reimplemented from SoQtComponent.
Reimplemented in SoQtRenderArea, SoQtViewer, SoQtFullViewer, SoQtPlaneViewer, SoQtExaminerViewer, SoQtConstrainedViewer, and SoQtFlyViewer.
void SoQtGLWidget::setBorder | ( | const SbBool | enable | ) |
Specify whether or not there should be a border framing the OpenGL canvas. The border will be 2 pixels wide.
The default is to display the OpenGL canvas with no border.
SbBool SoQtGLWidget::isBorder | ( | void | ) | const |
Returns whether or not there's a border framing the OpenGL canvas.
Referenced by setGLSize().
void SoQtGLWidget::setDoubleBuffer | ( | const SbBool | enable | ) | [virtual] |
Switch between single and double buffer mode for the OpenGL canvas. The default is to use a single buffer canvas.
Reimplemented in SoQtViewer.
Referenced by SoQtViewer::setBufferingType(), and SoQtViewer::setDoubleBuffer().
SbBool SoQtGLWidget::isDoubleBuffer | ( | void | ) | const |
Returns the status of the buffer mode.
Referenced by SoQtViewer::actualRedraw(), SoQtRenderArea::redraw(), and SoQtViewer::SoQtViewer().
void SoQtGLWidget::setDrawToFrontBufferEnable | ( | const SbBool | enable | ) |
If this is set to TRUE
, rendering will happen in the front buffer even if the current rendering mode is double buffered.
References drawToFrontBuffer.
SbBool SoQtGLWidget::isDrawToFrontBufferEnable | ( | void | ) | const |
References drawToFrontBuffer.
Referenced by SoQtRenderArea::redraw().
void SoQtGLWidget::setQuadBufferStereo | ( | const SbBool | enable | ) |
Enables or disables OpenGL quad buffer stereo.
Referenced by setStereoBuffer(), and SoQtViewer::setStereoType().
SbBool SoQtGLWidget::isQuadBufferStereo | ( | void | ) | const |
Returns TRUE
if quad buffer stereo is enabled for this widget.
Referenced by SoQtViewer::getStereoType(), isStereoBuffer(), and SoQtViewer::setStereoType().
void SoQtGLWidget::setAccumulationBuffer | ( | const SbBool | enable | ) |
Enables/disables the OpenGL accumulation buffer.
For general information about accumulation buffers, confer with your OpenGL reference documentation.
By default, the accumulation buffer will be attempted disabled. Whether or not it will actually be disabled depends on what OpenGL contexts are available on the system. It is perfectly possible that the only usable contexts with regard to the other settings (like double buffering and RGBA mode versus color index mode) causes the context selection to choose an OpenGL format that contains an accumulation buffer, even though it was not requested.
Vice versa, one is not guaranteed to get accumulation buffers even when requested through this function, either because they are not available, or because they are only available in combination with other OpenGL context settings that are not wanted (like single buffers, non-accellerated rendering, etc).
If you try to enable accumulation buffers by using this function, you should therefore in succession use the SoQtGLWidget::getAccumulationBuffer() to query whether or not an accumulation buffer could actually be set up.
SbBool SoQtGLWidget::getAccumulationBuffer | ( | void | ) | const |
Returns whether the OpenGL accumulation buffer is enabled.
The returned flag will indicate whether or not accumulation buffers are actually present, and not just parrot the input value to SoQtGLWidget::setAccumulationBuffer(). See documentation of that function for more information.
void SoQtGLWidget::setStencilBuffer | ( | const SbBool | enable | ) |
Enables/disables the OpenGL stencil buffer.
For general information about stencil buffers, confer with your OpenGL reference documentation.
By default, the stencil buffer will be attempted disabled, but the same notes apply for stencil buffers as for accumulation buffers. For an explanation on the issue of stencil and accumulation buffer availability, see the function documentation of SoQtGLWidget::setAccumulationBuffer().
Referenced by SoQtViewer::setStereoType().
SbBool SoQtGLWidget::getStencilBuffer | ( | void | ) | const |
Returns whether the OpenGL stencil buffer is enabled.
The returned flag will indicate whether or not stencil buffers are actually present, in the same manner as for SoQtGLWidget::getAccumulationBuffer(). See documentation of SoQtGLWidget::setStencilBuffer().
Referenced by SoQtViewer::setStereoType().
void SoQtGLWidget::setAlphaChannel | ( | const SbBool | enable | ) |
Enables/disables the alpha channel for the OpenGL context.
SbBool SoQtGLWidget::getAlphaChannel | ( | void | ) | const |
Returns whether the alpha channel is enabled for the OpenGL context.
void SoQtGLWidget::setOverlayRender | ( | const SbBool | onoff | ) |
Turn on or off the use of overlay planes.
Referenced by SoQtRenderArea::setOverlaySceneGraph().
SbBool SoQtGLWidget::isOverlayRender | ( | void | ) | const |
Returns a flag indicating whether or not overplay planes are currently used.
void SoQtGLWidget::setStealFocus | ( | SbBool | enable | ) |
Sets whether the GL widget should steal keyboard focus when the mouse is over the GL view.
Default is TRUE
.
SbBool SoQtGLWidget::isStealFocus | ( | void | ) | const |
Returns whether focus stealing policy is on (TRUE
) or off (FALSE
).
Default is TRUE
.
QWidget * SoQtGLWidget::getGLWidget | ( | void | ) | const |
Returns a pointer to the toolkit-native GL widget.
Referenced by SoQtRenderArea::buildWidget(), getNormalWidget(), getOverlayWidget(), glFlushBuffer(), SoQtFullViewer::openPopupMenu(), SoQtRenderArea::registerDevice(), SoQtFullViewer::setComponentCursor(), setGLSize(), and SoQtRenderArea::unregisterDevice().
QWidget * SoQtGLWidget::getNormalWidget | ( | void | ) | const |
For SoQt, this returns the same widget pointer as that of SoQtGLWidget::getGLWidget().
References getGLWidget().
Referenced by hasNormalGLArea().
QWidget * SoQtGLWidget::getOverlayWidget | ( | void | ) | const |
Returns widget associated with overlay planes, or NULL
if no overlay planes are available.
For the Qt toolkit, overlay planes is a feature of the QGLWidget, and not seen at a separate widget entity. So this call will just return the same widget reference as the SoQt::getGLWidget() call (if overlay planes are supported).
References getGLWidget().
Referenced by hasOverlayGLArea().
SbBool SoQtGLWidget::hasOverlayGLArea | ( | void | ) | const |
Will return TRUE
if an overlay GL drawing area exists.
References getOverlayWidget().
Referenced by SoQtRenderArea::glScheduleRedraw(), and SoQtRenderArea::redrawOverlay().
SbBool SoQtGLWidget::hasNormalGLArea | ( | void | ) | const |
Will return TRUE
if a normal GL drawing area exists.
References getNormalWidget().
Referenced by SoQtRenderArea::redraw().
unsigned long SoQtGLWidget::getOverlayTransparentPixel | ( | void | ) |
Returns the overlay transparent pixel.
void SoQtGLWidget::getPointSizeLimits | ( | SbVec2f & | range, | |
float & | granularity | |||
) |
This function is provided as a convenience for the application programmer to help with acquiring the OpenGL implementation limits for rendering points.
For robust application code, one needs to consider the range limits when setting the SoDrawStyle::pointSize field.
References glLockNormal(), and glUnlockNormal().
void SoQtGLWidget::getLineWidthLimits | ( | SbVec2f & | range, | |
float & | granularity | |||
) |
This function is provided as a convenience for the application programmer to help with acquiring the OpenGL implementation limits for rendering lines.
For robust application code, one needs to consider the range limits when setting the SoDrawStyle::lineWidth field.
References glLockNormal(), and glUnlockNormal().
void SoQtGLWidget::processEvent | ( | QEvent * | anyevent | ) | [protected, virtual] |
Any events from the native window system that goes to the OpenGL canvas gets piped through this method.
It is overridden in the subclasses to catch user interaction with the render canvas in the viewers, aswell as forwarding relevant events to the scenegraph.
Reimplemented in SoQtRenderArea.
Referenced by SoQtRenderArea::processEvent().
QWidget * SoQtGLWidget::buildWidget | ( | QWidget * | parent | ) | [protected] |
This method builds the component contents in the given parent widget. For subclasses adding new user interface items, this method is typically overridden in the following manner:
QWidget * MyOwnViewer::buildWidget(QWidget * parent) { QWidget * superw = <superclass>::buildWidget(parent); // [then move superw within MyOwnViewer framework and add own // user interface components] }
Reimplemented in SoQtRenderArea, SoQtFullViewer, and SoQtPlaneViewer.
References SoQtComponent::isTopLevelShell(), and SoQtComponent::registerWidget().
Referenced by SoQtRenderArea::buildWidget(), and SoQtGLWidget().
void SoQtGLWidget::redraw | ( | void | ) | [protected, pure virtual] |
This method is invoked when the GL buffer needs to be redrawn.
Implemented in SoQtRenderArea.
void SoQtGLWidget::redrawOverlay | ( | void | ) | [protected, virtual] |
Renders the overlay scene graph. Default method is empty. Subclasses should override this method.
Reimplemented in SoQtRenderArea.
void SoQtGLWidget::initGraphic | ( | void | ) | [protected, virtual] |
Will be called when GL widget should initialize graphic, after the widget has been created. Default method enabled GL_DEPTH_TEST.
Reimplemented in SoQtRenderArea.
References glLockNormal(), and glUnlockNormal().
Referenced by SoQtRenderArea::initGraphic().
void SoQtGLWidget::initOverlayGraphic | ( | void | ) | [protected, virtual] |
Will be called after the overlay widget has been created, and subclasses should override this to initialize overlay stuff.
Default method does nothing.
Reimplemented in SoQtRenderArea.
void SoQtGLWidget::sizeChanged | ( | const SbVec2s & | size | ) | [protected, virtual] |
Called internally from within the SoQt library when the widget embedded in a component changes it size, which is usually triggered by end-user interaction.
This method is then invoked to notify the component that the size has changed. It is called from the top and all the way down to the bottom, the size being adjusted to take into account extra decorations having been added at each level in the component class hierarchy.
Reimplemented from SoQtComponent.
Reimplemented in SoQtRenderArea, SoQtViewer, and SoQtFullViewer.
Referenced by SoQtRenderArea::sizeChanged().
void SoQtGLWidget::widgetChanged | ( | QWidget * | w | ) | [protected, virtual] |
This is the method which gets called whenever we change which OpenGL widget is used.
Should be overridden in subclasses which directly or indirectly store the return value from the SoQtGLWidget::getGLWidget() method.
Reimplemented in SoQtRenderArea.
void SoQtGLWidget::setGLSize | ( | const SbVec2s | size | ) | [protected] |
Sets the size of the GL canvas.
References getGLWidget(), and isBorder().
Referenced by SoQtRenderArea::sizeChanged().
SbVec2s SoQtGLWidget::getGLSize | ( | void | ) | const [protected] |
Return the dimensions of the OpenGL canvas.
Referenced by SoQtFullViewer::openPopupMenu(), SoQtPlaneViewer::processSoEvent(), SoQtExaminerViewer::processSoEvent(), SoQtRenderArea::registerDevice(), SoQtRenderArea::setOverlaySceneManager(), SoQtRenderArea::setSceneManager(), and SoQtRenderArea::sizeChanged().
float SoQtGLWidget::getGLAspectRatio | ( | void | ) | const [protected] |
Return the aspect ratio of the OpenGL canvas.
Referenced by SoQtPlaneViewer::bottomWheelMotion(), SoQtPlaneViewer::leftWheelMotion(), SoQtPlaneViewer::processSoEvent(), and SoQtExaminerViewer::processSoEvent().
void SoQtGLWidget::setGlxSize | ( | const SbVec2s | size | ) | [inline, protected] |
This function has been renamed to the more appropriate setGLSize.
SbVec2s SoQtGLWidget::getGlxSize | ( | void | ) | const [inline, protected] |
This function has been renamed to the more appropriate getGLSize.
float SoQtGLWidget::getGlxAspectRatio | ( | void | ) | const [inline, protected] |
This function has been renamed to the more appropriate getGLAspectRatio.
void SoQtGLWidget::setStereoBuffer | ( | SbBool | flag | ) | [protected] |
Sets whether OpenGL stereo buffers (quad buffer stereo) should be used.
References setQuadBufferStereo().
SbBool SoQtGLWidget::isStereoBuffer | ( | void | ) | const [protected] |
Returns whether OpenGL stereo buffers are being used.
References isQuadBufferStereo().
SbBool SoQtGLWidget::isRGBMode | ( | void | ) | [protected] |
Returns TRUE
if the normal GL context is in RGBA mode. Return FALSE
if color index mode is used.
Referenced by SoQtRenderArea::initGraphic(), and SoQtRenderArea::widgetChanged().
void SoQtGLWidget::glLockNormal | ( | void | ) | [protected] |
This method calls make-current on the correct context and ups the lock level.
Referenced by getLineWidthLimits(), getPointSizeLimits(), initGraphic(), SoQtRenderArea::processEvent(), and SoQtRenderArea::redraw().
void SoQtGLWidget::glUnlockNormal | ( | void | ) | [protected] |
This method drops the lock level.
Referenced by getLineWidthLimits(), getPointSizeLimits(), initGraphic(), SoQtRenderArea::processEvent(), and SoQtRenderArea::redraw().
void SoQtGLWidget::glLockOverlay | ( | void | ) | [protected] |
This method calls make-current on the correct context and ups the lock level.
Referenced by SoQtRenderArea::redrawOverlay().
void SoQtGLWidget::glUnlockOverlay | ( | void | ) | [protected] |
This method drops the lock level.
Referenced by SoQtRenderArea::redrawOverlay().
void SoQtGLWidget::glSwapBuffers | ( | void | ) | [protected] |
Swap back buffer to front and vice versa.
Referenced by SoQtRenderArea::redraw().
void SoQtGLWidget::glFlushBuffer | ( | void | ) | [protected] |
Flush the current GL buffer. Simply calls glFlush().
References getGLWidget().
Referenced by SoQtRenderArea::redraw(), and SoQtRenderArea::redrawOverlay().
SbBool SoQtGLWidget::glScheduleRedraw | ( | void | ) | [protected, virtual] |
Will be called whenever scene graph needs to be redrawn. If this method return FALSE
, redraw() will be called immediately.
Default method simply returns FALSE
. Override this method to schedule a redraw and return TRUE
if you're trying to do The Right Thing.
Reimplemented in SoQtRenderArea.
SbBool SoQtGLWidget::waitForExpose [protected] |
If this is TRUE
, rendering should not be done yet. Upon the first expose event of a newly created OpenGL widget, this variable will be set to FALSE
.
Referenced by SoQtRenderArea::redraw(), and SoQtRenderArea::redrawOverlay().
SbBool SoQtGLWidget::drawToFrontBuffer [protected] |
If this is TRUE
, rendering will happen in the front buffer even if the current rendering mode is double buffered.
Referenced by isDrawToFrontBufferEnable(), and setDrawToFrontBufferEnable().
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