79 lines
1.7 KiB
C++
79 lines
1.7 KiB
C++
//
|
|
// Created by Иван Ильин on 11.01.2021.
|
|
//
|
|
|
|
#include "Time.h"
|
|
#include <chrono>
|
|
|
|
#define BIG_STEP (1.0/15.0)
|
|
|
|
using namespace std::chrono;
|
|
|
|
namespace Time
|
|
{
|
|
namespace
|
|
{
|
|
// High precision time
|
|
high_resolution_clock::time_point _start = high_resolution_clock::now();
|
|
high_resolution_clock::time_point _last = _start;
|
|
|
|
// FPS counter
|
|
high_resolution_clock::time_point _fpsStart;
|
|
milliseconds _fpsCountTime = milliseconds(1000);
|
|
int _fpsCounter = 0;
|
|
double _lastFps = 0;
|
|
|
|
// Compatibility
|
|
double _time;
|
|
double _deltaTime;
|
|
double _realDeltaTime;
|
|
}
|
|
|
|
double time()
|
|
{
|
|
return _time;
|
|
}
|
|
|
|
double deltaTime()
|
|
{
|
|
return _deltaTime;
|
|
}
|
|
|
|
double realDeltaTime()
|
|
{
|
|
return _realDeltaTime;
|
|
}
|
|
|
|
void update()
|
|
{
|
|
high_resolution_clock::time_point t = high_resolution_clock::now();
|
|
|
|
|
|
_deltaTime = duration<double>(t - _last).count();
|
|
_time = duration<double>(t - _start).count();
|
|
// in case when fps < 10 it is useful to decrease _deltaTime (to avoid collision problems)
|
|
if(_deltaTime > BIG_STEP)
|
|
_deltaTime = BIG_STEP;
|
|
|
|
_realDeltaTime = duration<double>(t - _last).count();
|
|
_last = t;
|
|
|
|
if(_deltaTime > 10000)
|
|
return;
|
|
|
|
_fpsCounter++;
|
|
if (t - _fpsStart > _fpsCountTime)
|
|
{
|
|
_lastFps = _fpsCounter / duration<double>(t - _fpsStart).count();
|
|
_fpsCounter = 0;
|
|
_fpsStart = t;
|
|
}
|
|
}
|
|
|
|
int fps()
|
|
{
|
|
// Cast is faster than floor and has the same behavior for positive numbers
|
|
return static_cast<int>(_lastFps);
|
|
}
|
|
}
|