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diff --git a/src/viewer/Qt3DSViewerTimer.h b/src/viewer/Qt3DSViewerTimer.h
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+/****************************************************************************
+**
+** Copyright (C) 2013 - 2016 NVIDIA Corporation.
+** Copyright (C) 2017 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QT3DS_ELAPSED_TIMER_H
+#define QT3DS_ELAPSED_TIMER_H
+#include <QElapsedTimer>
+
+namespace Q3DSViewer {
+
+///< @brief this class implementes a elapsed timer using QElapsedTimer
+class Qt3DSElapsedTimer
+{
+public:
+    QElapsedTimer m_elapsedTimer;
+    QElapsedTimer::ClockType m_clockType;
+
+    Qt3DSElapsedTimer()
+    {
+        m_clockType = QElapsedTimer::clockType();
+        reset();
+    }
+
+    void reset() { m_elapsedTimer.start(); }
+
+    qint64 getNanoSeconds()
+    {
+        qint64 time = m_elapsedTimer.nsecsElapsed();
+        reset();
+        return time;
+    }
+};
+
+///< @brief this class implementes a timer using QElapsedTimer
+class Qt3DSTimer
+{
+public:
+    QElapsedTimer m_timer;
+
+    Qt3DSTimer() { start(); }
+
+    void start() { m_timer.start(); }
+
+    qint64 getNanoSeconds() { return static_cast<qint64>(m_timer.elapsed() * 1000 * 1000); }
+};
+
+///< @brief this class implementes a circular buffer
+template <typename TDataType, unsigned long TBufferSize = 20>
+struct NumericCircularBuffer
+{
+    unsigned long m_TotalNumElements; ///< holds the current number of elements
+    unsigned long m_NumElements; ///< restricts the size to TBufferSize and wrappes around
+    unsigned long m_NextIndex; ///< next index
+    TDataType m_RunningTotal; ///< summed value of all entries
+    TDataType m_Elements[TBufferSize]; ///< element buffer
+
+    NumericCircularBuffer() { clear(); }
+    void clear()
+    {
+        m_TotalNumElements = 0;
+        m_NumElements = 0;
+        m_NextIndex = 0;
+        m_RunningTotal = 0;
+        memset(m_Elements, 0, sizeof(TDataType) * TBufferSize);
+    }
+
+    void push_back(const TDataType &data)
+    {
+        if (m_NumElements < TBufferSize)
+            ++m_NumElements;
+        else
+            m_RunningTotal -= m_Elements[m_NextIndex];
+        m_RunningTotal += data;
+        ++m_TotalNumElements;
+        m_Elements[m_NextIndex] = data;
+        m_NextIndex = (m_NextIndex + 1) % TBufferSize;
+    }
+    unsigned long size() const { return m_NumElements; }
+    TDataType average() const
+    {
+        TDataType mySize = ((TDataType)size());
+        if (mySize)
+            return m_RunningTotal / mySize;
+        return 0;
+    }
+
+    unsigned long getTotalItems() const { return m_TotalNumElements; }
+
+    static unsigned long getBufferSize() { return TBufferSize; }
+};
+
+} // end namspace
+
+#endif // QT3DS_ELAPSED_TIMER_H