diff options
Diffstat (limited to 'src/Runtime/Source/foundation/Qt3DSTime.h')
-rw-r--r-- | src/Runtime/Source/foundation/Qt3DSTime.h | 97 |
1 files changed, 97 insertions, 0 deletions
diff --git a/src/Runtime/Source/foundation/Qt3DSTime.h b/src/Runtime/Source/foundation/Qt3DSTime.h new file mode 100644 index 00000000..955bd7e0 --- /dev/null +++ b/src/Runtime/Source/foundation/Qt3DSTime.h @@ -0,0 +1,97 @@ +/**************************************************************************** +** +** 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 |