[DirectX12] 6) Timer

Unity의 DeltaTime을 사용하기 위해 구현하고,

게임 내 FPS를 확인하기 위하여 구현

 

Timer.h

#pragma once


class Timer
{
	DECLARE_SINGLE(Timer);
public:
	void Init();
	void Update();

	uint32 GetFps() { return _fps; }
	float GetDeltaTime() { return _deltaTime; }

private:
	uint64	_frequency = 0;
	uint64	_prevCount = 0;
	float	_deltaTime = 0.f;

private:
	uint32	_frameCount = 0;
	float	_frameTime = 0.f;
	uint32	_fps = 0;
};

 

Timer.cpp

#include "Timer.h"

void Timer::Init()
{
	::QueryPerformanceFrequency(reinterpret_cast<LARGE_INTEGER*>(&_frequency));
	::QueryPerformanceCounter(reinterpret_cast<LARGE_INTEGER*>(&_prevCount)); // CPU 클럭
}

void Timer::Update()
{
	uint64 currentCount;
	::QueryPerformanceCounter(reinterpret_cast<LARGE_INTEGER*>(&currentCount));

	_deltaTime = (currentCount - _prevCount) / static_cast<float>(_frequency);
	_prevCount = currentCount;

	_frameCount++;
	_frameTime += _deltaTime;

	if (_frameTime > 1.f)
	{
		_fps = static_cast<uint32>(_frameCount / _frameTime);

		_frameTime = 0.f;
		_frameCount = 0;
	}
}