#include <QGuiApplication>
#include <QQuickWindow>
#include <QSurfaceFormat>

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

    QQuickWindow::setGraphicsApi(QSGRendererInterface::OpenGL);

    QSurfaceFormat sf;
    sf.setRenderableType(QSurfaceFormat::OpenGLES);
    QSurfaceFormat::setDefaultFormat(sf);

    QQuickWindow window;
    window.show();

    return a.exec();
}

QRhiGles2: Failed to create temporary context
QRhiGles2: Failed to create context
Failed to create RHI (backend 2)
Failed to create QRhi on the render thread; scenegraph is not functional
Failed to initialize graphics backend for OpenGL.