text: // This code contains NVIDIA Confidential Information and is disclosed to you
  // under a form of NVIDIA software license agreement provided separately to you.
  //
  // Notice
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  // proprietary rights in and to this software and related documentation and
  // any modifications thereto. Any use, reproduction, disclosure, or
  // distribution of this software and related documentation without an express
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  //
  // ALL NVIDIA DESIGN SPECIFICATIONS, CODE ARE PROVIDED "AS IS.". NVIDIA MAKES
  // NO WARRANTIES, EXPRESSED, IMPLIED, STATUTORY, OR OTHERWISE WITH RESPECT TO
  // THE MATERIALS, AND EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES OF NONINFRINGEMENT,
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  // However, NVIDIA Corporation assumes no responsibility for the consequences of use of such
  // information or for any infringement of patents or other rights of third parties that may
  // result from its use. No license is granted by implication or otherwise under any patent
  // or patent rights of NVIDIA Corporation. Details are subject to change without notice.
  // This code supersedes and replaces all information previously supplied.
  // NVIDIA Corporation products are not authorized for use as critical
  // components in life support devices or systems without express written approval of
  // NVIDIA Corporation.
  //
  // Copyright (c) 2008-2014 NVIDIA Corporation. All rights reserved.
  // Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved.
  // Copyright (c) 2001-2004 NovodeX AG. All rights reserved.
  
  #include "NsTime.h"
  #include "windows/NsWindowsInclude.h"
  
  namespace
  {
  int64_t getTimeTicks()
  {
  	LARGE_INTEGER a;
  	QueryPerformanceCounter(&a);
  	return a.QuadPart;
  }
  
  double getTickDuration()
  {
  	LARGE_INTEGER a;
  	QueryPerformanceFrequency(&a);
  	return 1.0f / double(a.QuadPart);
  }
  
  double sTickDuration = getTickDuration();
  } // namespace
  
  namespace nvidia
  {
  namespace shdfnd
  {
  
  static const CounterFrequencyToTensOfNanos gCounterFreq = Time::getCounterFrequency();
  
  const CounterFrequencyToTensOfNanos& Time::getBootCounterFrequency()
  {
  	return gCounterFreq;
  }
  
  CounterFrequencyToTensOfNanos Time::getCounterFrequency()
  {
  	LARGE_INTEGER freq;
  	QueryPerformanceFrequency(&freq);
  	return CounterFrequencyToTensOfNanos(Time::sNumTensOfNanoSecondsInASecond, (uint64_t)freq.QuadPart);
  }
  
  uint64_t Time::getCurrentCounterValue()
  {
  	LARGE_INTEGER ticks;
  	QueryPerformanceCounter(&ticks);
  	return (uint64_t)ticks.QuadPart;
  }
  
  Time::Time() : mTickCount(0)
  {
  	getElapsedSeconds();
  }
  
  Time::Second Time::getElapsedSeconds()
  {
  	int64_t lastTickCount = mTickCount;
  	mTickCount = getTimeTicks();
  	return (mTickCount - lastTickCount) * sTickDuration;
  }
  
  Time::Second Time::peekElapsedSeconds()
  {
  	return (getTimeTicks() - mTickCount) * sTickDuration;
  }
  
  Time::Second Time::getLastTime() const
  {
  	return mTickCount * sTickDuration;
  }
  
  } // namespace shdfnd
  } // namespace nvidia
  