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#include <QtGui/QPaintDevice>
#include <QtGui/QWidget>
#include <QtOpenGL/QGLWidget>
#include "private/qglwindowsurface_qws_p.h"
#include "private/qpaintengine_opengl_p.h"

QT_BEGIN_NAMESPACE

/*!
    \class QWSGLWindowSurface
    \since 4.3
    \ingroup qws
    \preliminary

    \brief The QWSGLWindowSurface class provides the drawing area for top-level
    windows with Qt for Embedded Linux on EGL/OpenGL ES. It also provides the
    drawing area for \l{QGLWidget}s whether they are top-level windows or
    children of another QWidget.

    Note that this class is only available in Qt for Embedded Linux and only
    available if Qt is configured with OpenGL support.
*/

class QWSGLWindowSurfacePrivate
{
public:
    QWSGLWindowSurfacePrivate() :
        qglContext(0), ownsContext(false) {}

    QGLContext *qglContext;
    bool ownsContext;
};

/*!
    Constructs an empty QWSGLWindowSurface for the given top-level \a window.
    The window surface is later initialized from chooseContext() and resources for it
    is typically allocated in setGeometry().
*/
QWSGLWindowSurface::QWSGLWindowSurface(QWidget *window)
    : QWSWindowSurface(window),
      d_ptr(new QWSGLWindowSurfacePrivate)
{
}

/*!
    Constructs an empty QWSGLWindowSurface.
*/
QWSGLWindowSurface::QWSGLWindowSurface()
    : d_ptr(new QWSGLWindowSurfacePrivate)
{
}

/*!
    Destroys the QWSGLWindowSurface object and frees any
    allocated resources.
 */
QWSGLWindowSurface::~QWSGLWindowSurface()
{
    Q_D(QWSGLWindowSurface);
    if (d->ownsContext)
        delete d->qglContext;
    delete d;
}

/*!
    Returns the QGLContext of the window surface.
*/
QGLContext *QWSGLWindowSurface::context() const
{
    Q_D(const QWSGLWindowSurface);
    if (!d->qglContext) {
        QWSGLWindowSurface *that = const_cast<QWSGLWindowSurface*>(this);
        that->setContext(new QGLContext(QGLFormat::defaultFormat()));
        that->d_func()->ownsContext = true;
    }
    return d->qglContext;
}

/*!
    Sets the QGLContext for this window surface to \a context.
*/
void QWSGLWindowSurface::setContext(QGLContext *context)
{
    Q_D(QWSGLWindowSurface);
    if (d->ownsContext) {
        delete d->qglContext;
        d->ownsContext = false;
    }
    d->qglContext = context;
}

QT_END_NAMESPACE
