qtdeclarative/examples/quick/scenegraph/textureinthread/main.cpp

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#include <QtCore/QThread>

#include <QGuiApplication>

#include <QtQuick/QQuickView>

#include "threadrenderer.h"

int main(int argc, char **argv)
{
    QGuiApplication app(argc, argv);

    qmlRegisterType<ThreadRenderer>("SceneGraphRendering", 1, 0, "Renderer");
    int execReturn = 0;

    {
        QQuickView view;

        // Rendering in a thread introduces a slightly more complicated cleanup
        // so we ensure that no cleanup of graphics resources happen until the
        // application is shutting down.
        view.setPersistentOpenGLContext(true);
        view.setPersistentSceneGraph(true);

        view.setResizeMode(QQuickView::SizeRootObjectToView);
        view.setSource(QUrl("qrc:///scenegraph/textureinsgnode/main.qml"));
        view.show();

        execReturn = app.exec();
    }

    // As the render threads make use of our QGuiApplication object
    // to clean up gracefully, wait for them to finish before
    // QGuiApp is taken off the heap.
    foreach (QThread *t, ThreadRenderer::threads) {
        t->wait();
        delete t;
    }

    return execReturn;
}