//
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//    notice, this list of conditions and the following disclaimer.
//  * Redistributions in binary form must reproduce the above copyright
//    notice, this list of conditions and the following disclaimer in the
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//  * Neither the name of NVIDIA CORPORATION nor the names of its
//    contributors may be used to endorse or promote products derived
//    from this software without specific prior written permission.
//
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Copyright (c) 2008-2019 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 "PsTime.h"
#include "windows/PsWindowsInclude.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 physx
{
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 physx
