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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