dd996a3289
forcing users to use osgDB::readRef*File() methods. The later is preferable as it closes a potential threading bug when using paging databases in conjunction
with the osgDB::Registry Object Cache. This threading bug occurs when one thread gets an object from the Cache via an osgDB::read*File() call where only
a pointer to the object is passed back, so taking a reference to the object is delayed till it gets reassigned to a ref_ptr<>, but at the same time another
thread calls a flush of the Object Cache deleting this object as it's referenceCount is now zero. Using osgDB::readREf*File() makes sure the a ref_ptr<> is
passed back and the referenceCount never goes to zero.
To ensure the OSG builds when OSG_PROVIDE_READFILE is to OFF the many cases of osgDB::read*File() usage had to be replaced with a ref_ptr<> osgDB::readRef*File()
usage. The avoid this change causing lots of other client code to be rewritten to handle the use of ref_ptr<> in place of C pointer I introduced a serious of
templte methods in various class to adapt ref_ptr<> to the underly C pointer to be passed to old OSG API's, example of this is found in include/osg/Group:
bool addChild(Node* child); // old method which can only be used with a Node*
tempalte<class T> bool addChild(const osg::ref_ptr<T>& child) { return addChild(child.get()); } // adapter template method
These changes together cover 149 modified files, so it's a large submission. This extent of changes are warrent to make use of the Object Cache
and multi-threaded loaded more robust.
git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/trunk@15164 16af8721-9629-0410-8352-f15c8da7e697
120 lines
4.9 KiB
C++
120 lines
4.9 KiB
C++
#include <QTimer>
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#include <QApplication>
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#include <QGridLayout>
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#include <osgViewer/CompositeViewer>
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#include <osgViewer/ViewerEventHandlers>
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#include <osgGA/MultiTouchTrackballManipulator>
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#include <osgDB/ReadFile>
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#include <osgQt/GraphicsWindowQt>
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#include <iostream>
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class ViewerWidget : public QWidget, public osgViewer::CompositeViewer
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{
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public:
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ViewerWidget(QWidget* parent = 0, Qt::WindowFlags f = 0, osgViewer::ViewerBase::ThreadingModel threadingModel=osgViewer::CompositeViewer::SingleThreaded) : QWidget(parent, f)
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{
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setThreadingModel(threadingModel);
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// disable the default setting of viewer.done() by pressing Escape.
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setKeyEventSetsDone(0);
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QWidget* widget1 = addViewWidget( createGraphicsWindow(0,0,100,100), osgDB::readRefNodeFile("cow.osgt") );
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QWidget* widget2 = addViewWidget( createGraphicsWindow(0,0,100,100), osgDB::readRefNodeFile("glider.osgt") );
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QWidget* widget3 = addViewWidget( createGraphicsWindow(0,0,100,100), osgDB::readRefNodeFile("axes.osgt") );
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QWidget* widget4 = addViewWidget( createGraphicsWindow(0,0,100,100), osgDB::readRefNodeFile("fountain.osgt") );
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QWidget* popupWidget = addViewWidget( createGraphicsWindow(900,100,320,240,"Popup window",true), osgDB::readRefNodeFile("dumptruck.osgt") );
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popupWidget->show();
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QGridLayout* grid = new QGridLayout;
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grid->addWidget( widget1, 0, 0 );
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grid->addWidget( widget2, 0, 1 );
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grid->addWidget( widget3, 1, 0 );
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grid->addWidget( widget4, 1, 1 );
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setLayout( grid );
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connect( &_timer, SIGNAL(timeout()), this, SLOT(update()) );
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_timer.start( 10 );
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}
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QWidget* addViewWidget( osgQt::GraphicsWindowQt* gw, osg::ref_ptr<osg::Node> scene )
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{
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osgViewer::View* view = new osgViewer::View;
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addView( view );
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osg::Camera* camera = view->getCamera();
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camera->setGraphicsContext( gw );
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const osg::GraphicsContext::Traits* traits = gw->getTraits();
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camera->setClearColor( osg::Vec4(0.2, 0.2, 0.6, 1.0) );
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camera->setViewport( new osg::Viewport(0, 0, traits->width, traits->height) );
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camera->setProjectionMatrixAsPerspective(30.0f, static_cast<double>(traits->width)/static_cast<double>(traits->height), 1.0f, 10000.0f );
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view->setSceneData( scene );
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view->addEventHandler( new osgViewer::StatsHandler );
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view->setCameraManipulator( new osgGA::MultiTouchTrackballManipulator );
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gw->setTouchEventsEnabled( true );
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return gw->getGLWidget();
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}
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osgQt::GraphicsWindowQt* createGraphicsWindow( int x, int y, int w, int h, const std::string& name="", bool windowDecoration=false )
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{
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osg::DisplaySettings* ds = osg::DisplaySettings::instance().get();
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osg::ref_ptr<osg::GraphicsContext::Traits> traits = new osg::GraphicsContext::Traits;
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traits->windowName = name;
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traits->windowDecoration = windowDecoration;
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traits->x = x;
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traits->y = y;
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traits->width = w;
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traits->height = h;
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traits->doubleBuffer = true;
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traits->alpha = ds->getMinimumNumAlphaBits();
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traits->stencil = ds->getMinimumNumStencilBits();
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traits->sampleBuffers = ds->getMultiSamples();
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traits->samples = ds->getNumMultiSamples();
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return new osgQt::GraphicsWindowQt(traits.get());
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}
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virtual void paintEvent( QPaintEvent* event )
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{ frame(); }
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protected:
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QTimer _timer;
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};
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int main( int argc, char** argv )
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{
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osg::ArgumentParser arguments(&argc, argv);
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#if QT_VERSION >= 0x050000
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// Qt5 is currently crashing and reporting "Cannot make QOpenGLContext current in a different thread" when the viewer is run multi-threaded, this is regression from Qt4
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osgViewer::ViewerBase::ThreadingModel threadingModel = osgViewer::ViewerBase::SingleThreaded;
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#else
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osgViewer::ViewerBase::ThreadingModel threadingModel = osgViewer::ViewerBase::CullDrawThreadPerContext;
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#endif
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while (arguments.read("--SingleThreaded")) threadingModel = osgViewer::ViewerBase::SingleThreaded;
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while (arguments.read("--CullDrawThreadPerContext")) threadingModel = osgViewer::ViewerBase::CullDrawThreadPerContext;
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while (arguments.read("--DrawThreadPerContext")) threadingModel = osgViewer::ViewerBase::DrawThreadPerContext;
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while (arguments.read("--CullThreadPerCameraDrawThreadPerContext")) threadingModel = osgViewer::ViewerBase::CullThreadPerCameraDrawThreadPerContext;
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#if QT_VERSION >= 0x040800
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// Required for multithreaded QGLWidget on Linux/X11, see http://blog.qt.io/blog/2011/06/03/threaded-opengl-in-4-8/
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if (threadingModel != osgViewer::ViewerBase::SingleThreaded)
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QApplication::setAttribute(Qt::AA_X11InitThreads);
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#endif
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QApplication app(argc, argv);
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ViewerWidget* viewWidget = new ViewerWidget(0, Qt::Widget, threadingModel);
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viewWidget->setGeometry( 100, 100, 800, 600 );
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viewWidget->show();
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return app.exec();
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}
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