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Prevent QPainter buffer swap

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As the QGraphicsScene overlay does not work for all cards/drivers we disable the possible buffer swap of the qpainter, as this could be a potential source of the flickering. If the painter swaps buffers and we do it again the user will see first the correct picture (first swap) and then something uninitalized (second swap)
This commit is contained in:
Stefan Tröger 2014-09-28 19:44:39 +02:00 committed by wmayer
parent 4e63e11df6
commit 3cbfb0a5c7
1 changed files with 11 additions and 5 deletions
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16
src/Gui/Quarter/QuarterWidget.cpp
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@ -126,6 +126,16 @@ using namespace SIM::Coin3D::Quarter;
#ifndef GL_MULTISAMPLE_BIT_EXT
#define GL_MULTISAMPLE_BIT_EXT 0x20000000
#endif
//We need to avoid buffer swaping when initializing a QPainter on this widget
class QUARTER_DLL_API CustomGLWidget : public QGLWidget {
public:
CustomGLWidget(const QGLFormat& fo, QWidget* parent = 0, const QGLWidget* shareWidget = 0, Qt::WindowFlags f = 0)
: QGLWidget(fo, parent, shareWidget, f) {
setAutoBufferSwap(false);
};
};
/*! constructor */
QuarterWidget::QuarterWidget(const QGLFormat & format, QWidget * parent, const QGLWidget * sharewidget, Qt::WindowFlags f)
@ -153,7 +163,7 @@ QuarterWidget::constructor(const QGLFormat & format, const QGLWidget * sharewidg
{
QGraphicsScene* scene = new QGraphicsScene;
setScene(scene);
setViewport(new QGLWidget(format, this, sharewidget));
setViewport(new CustomGLWidget(format, this, sharewidget));
setFrameStyle(QFrame::NoFrame);
setAutoFillBackground(false);
@ -720,12 +730,8 @@ void QuarterWidget::paintEvent(QPaintEvent* event)
//start the standard graphics view processing for all widgets and graphic items. As
//QGraphicsView initaliizes a QPainter which changes the Opengl context in an unpredictable
//manner we need to store the context and recreate it after Qt is done.
glPushAttrib(GL_ALL_ATTRIB_BITS);
glPushAttrib(GL_MULTISAMPLE_BIT_EXT);
inherited::paintEvent(event);
glPopAttrib();
glPopAttrib();
if (w->doubleBuffer()) { w->swapBuffers(); }