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#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QtQuick3D/qquick3d.h>
#include <QtQuick3D/private/qquick3dviewport_p.h>
#include <qtimer.h>

int main(int argc, char *argv[])
{
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    QGuiApplication app(argc, argv);
    QSurfaceFormat::setDefaultFormat(QQuick3D::idealSurfaceFormat());

    QQmlApplicationEngine engine;
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;

    const QUrl shaderCacheFile("file:C:/dev/home/shadercachefile.dat");
    const auto rootObjects = engine.rootObjects();
    QQuick3DViewport *viewport = rootObjects[0]->findChildren<QQuick3DViewport *>().first();
    viewport->setShaderCacheFile(shaderCacheFile);
    QObject::connect(viewport, &QQuick3DViewport::shaderCacheLoadErrors, [](const QByteArray &errors){
        qDebug () << "Shader cache load errors: " << errors;
    });
    QObject::connect(viewport, &QQuick3DViewport::shaderCacheExported, [](bool success){
        qDebug () << "Shader cache exported: " << success;
    });
    QTimer::singleShot(2000, [viewport, shaderCacheFile](){
        viewport->exportShaderCache(shaderCacheFile, true, -1);
    });
    return app.exec();
}