#include "CThreadSleeper.h"
	CThreadSleeper::CThreadSleeper()
	{
	m_LastTick = m_NextTick = m_CurrentTick = CClock::now();
	}
	void CThreadSleeper::Start(unsigned int maxfps)
	{
	m_MaxFps = maxfps;
	m_CurrentTick = CClock::now();
	std::chrono::duration<double> delta = m_CurrentTick - m_LastTick;
	m_DeltaTime = delta.count();
	m_LastTick = m_CurrentTick;
	if (m_MaxFps)
	{
	m_WaitTime = 1.0 / static_cast<double>(m_MaxFps);
	auto interval = std::chrono::duration<double>(m_WaitTime);
	m_NextTick = std::chrono::time_point_cast<CClock::duration>(m_CurrentTick + interval);
	}
	else
	{
	m_NextTick = m_CurrentTick;
	}
	}
	void CThreadSleeper::End(bool yield, bool adaptive_sleep, bool strict_sleep)
	{
	auto now = CClock::now();
	if (m_MaxFps)
	{
	if(adaptive_sleep)
	{
	if (now < m_NextTick)
	{
	std::this_thread::sleep_until(m_NextTick);
	}
	else
	{
	//too late!
	m_NextTick = now;
	}
	}
	if(strict_sleep)
	{
	std::this_thread::sleep_for(std::chrono::duration<double>(m_WaitTime));
	}
	while (CClock::now() < m_NextTick)
	{
	if(yield)
	{
	std::this_thread::yield();
	}
	}
	}
	now = CClock::now();
	}