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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
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