<commit_before>#pragma once

#include "SubSystem.h"
#include <chrono>

namespace Mile
{
   class MEAPI Timer : public SubSystem
   {
   public:
      Timer( Context* context );
      ~Timer( );

      virtual bool Init( ) override;

      virtual void Update( ) override;

      void BeginFrame( );
      void EndFrame( );

      float GetDeltaTime( ) const
      {
         return GetDeltaTimeMS( ) * 0.001f;
      }

      long long GetDeltaTimeMS( ) const
      {
         return ( std::chrono::duration_cast< std::chrono::milliseconds >( m_deltaTime ).count( ) );
      }

      long long GetDeltaTimeNS( ) const
      {
         auto deltaTime = m_frameEndTime - m_frameBeginTime;
         return ( ( m_deltaTime ).count( ) );
      }

      long long GetFPS( ) const
      {
         return m_framePerSec;
      }

   private:
      std::chrono::steady_clock::time_point m_frameBeginTime;
      std::chrono::steady_clock::time_point m_frameEndTime;
      std::chrono::nanoseconds m_deltaTime;

      std::chrono::steady_clock::time_point m_frameMeasureBeginTime;
      long long   m_frameCount;<commit_msg>Commented at Timer<commit_after>#pragma once

#include "SubSystem.h"
#include <chrono>

namespace Mile
{
	/**
	 * @brief	Timer  ý   ð õ  ϰų ִ Ŭ Դϴ.
	 */
   class MEAPI Timer : public SubSystem
   {
   public:
      Timer( Context* context );
      ~Timer( );

      virtual bool Init( ) override;

      virtual void Update( ) override;

      void BeginFrame( );
      void EndFrame( );

	  /**
	   * @brief	 Ӱ  ӻ̿ ð ̸ ''  ȯ ݴϴ.
	   * @return Ӱ  ð()
	   */
      float GetDeltaTime( ) const
      {
         return GetDeltaTimeMS( ) * 0.001f;
      }

	  /**
	  * @brief	 Ӱ  ӻ̿ ð ̸ 'ms'  ȯ ݴϴ.
	  * @return Ӱ  ð(ms)
	  */
      long long GetDeltaTimeMS( ) const
      {
         return ( std::chrono::duration_cast< std::chrono::milliseconds >( m_deltaTime ).count( ) );
      }

	  /**
	  * @brief	 Ӱ  ӻ̿ ð ̸ 'ns'  ȯ ݴϴ.
	  * @return Ӱ  ð(ns)
	  */
      long long GetDeltaTimeNS( ) const
      {
         auto deltaTime = m_frameEndTime - m_frameBeginTime;
         return ( ( m_deltaTime ).count( ) );
      }

	  /**
	   * @brief	 ʴ   ߴ ȯմϴ.
	   * @return ʴ  
	   */
      long long GetFPS( ) const
      {
         return m_framePerSec;
      }

   private:
      std::chrono::steady_clock::time_point m_frameBeginTime;
      std::chrono::steady_clock::time_point m_frameEndTime;
      std::chrono::nanoseconds m_deltaTime;

      std::chrono::steady_clock::time_point m_frameMeasureBeginTime;
      long long   m_frameCount;
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