qt-everywhere-src-5.15.1/qt3d/tests/manual/render-qml-to-texture-qml/main.cpp

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#include <QGuiApplication>

#include <QtQuick/QQuickView>
#include <Qt3DQuick/QQmlAspectEngine>
#include <QQmlContext>
#include <QOpenGLContext>

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

    QSurfaceFormat format;
    if (QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGL) {
        format.setVersion(3, 2);
        format.setProfile(QSurfaceFormat::CoreProfile);
    }
    format.setDepthBufferSize(24);
    format.setStencilBufferSize(8);
    format.setSamples(4);

    QQuickView view;
    view.setFormat(format);
    view.setResizeMode(QQuickView::SizeRootObjectToView);
    view.setSource(QUrl("qrc:/main.qml"));
    view.setColor("#000000");
    view.show();

    return app.exec();
}