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/*
* Copyright (c) 2008-2017, NVIDIA CORPORATION. All rights reserved.
*
* NVIDIA CORPORATION and its licensors retain all intellectual property
* and proprietary rights in and to this software, related documentation
* and any modifications thereto. Any use, reproduction, disclosure or
* distribution of this software and related documentation without an express
* license agreement from NVIDIA CORPORATION is strictly prohibited.
*/
#ifndef SAMPLE_TIME_H
#define SAMPLE_TIME_H
#include <stdint.h>
class Time
{
public:
Time() : m_lastTickCount(getTimeTicks()) {}
double Time::getElapsedSeconds()
{
const int64_t lastTickCount = m_lastTickCount;
m_lastTickCount = getTimeTicks();
return (m_lastTickCount - lastTickCount) * s_secondsPerTick;
}
double Time::peekElapsedSeconds() const
{
return (getTimeTicks() - m_lastTickCount) * s_secondsPerTick;
}
double Time::getLastTime() const
{
return m_lastTickCount * s_secondsPerTick;
}
private:
static double getTickDuration()
{
LARGE_INTEGER a;
QueryPerformanceFrequency(&a);
return 1.0 / (double)a.QuadPart;
}
int64_t getTimeTicks() const
{
LARGE_INTEGER a;
QueryPerformanceCounter(&a);
return a.QuadPart;
}
int64_t m_lastTickCount;
static const double s_secondsPerTick;
};
#endif
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