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+/****************************************************************************
+**
+** Copyright (C) 2008-2012 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_FOUNDATION_PSTIME_H
+#define QT3DS_FOUNDATION_PSTIME_H
+
+#include "foundation/Qt3DS.h"
+
+#if defined(QT3DS_LINUX) || defined(QT3DS_ANDROID) || defined(QT3DS_QNX)
+#include <time.h>
+#endif
+
+namespace qt3ds {
+namespace foundation {
+
+ struct CounterFrequencyToTensOfNanos
+ {
+ QT3DSU64 mNumerator;
+ QT3DSU64 mDenominator;
+ CounterFrequencyToTensOfNanos(QT3DSU64 inNum, QT3DSU64 inDenom)
+ : mNumerator(inNum)
+ , mDenominator(inDenom)
+ {
+ }
+
+ // quite slow.
+ QT3DSU64 toTensOfNanos(QT3DSU64 inCounter) const
+ {
+ return (inCounter * mNumerator) / mDenominator;
+ }
+ };
+
+ class QT3DS_FOUNDATION_API Time
+ {
+ public:
+ typedef double Second;
+ static const QT3DSU64 sNumTensOfNanoSecondsInASecond = 100000000;
+ // This is supposedly guaranteed to not change after system boot
+ // regardless of processors, speedstep, etc.
+ static const CounterFrequencyToTensOfNanos sCounterFreq;
+
+ static CounterFrequencyToTensOfNanos getCounterFrequency();
+
+ static QT3DSU64 getCurrentCounterValue();
+
+ // SLOW!!
+ // Thar be a 64 bit divide in thar!
+ static QT3DSU64 getCurrentTimeInTensOfNanoSeconds()
+ {
+ QT3DSU64 ticks = getCurrentCounterValue();
+ return sCounterFreq.toTensOfNanos(ticks);
+ }
+
+ Time();
+ Second getElapsedSeconds();
+ Second peekElapsedSeconds();
+ Second getLastTime() const;
+
+ private:
+#if defined(QT3DS_LINUX) || defined(QT3DS_ANDROID) || defined(QT3DS_APPLE) || defined(QT3DS_PSP2) \
+ || defined(QT3DS_QNX)
+ Second mLastTime;
+#else
+ QT3DSI64 mTickCount;
+#endif
+ };
+} // namespace foundation
+} // namespace qt3ds
+
+#endif