render/c11timer.hxx at master · kanait/render · GitHub

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////////////////////////////////////////////////////////////////////
//
// $Id: c11timer.hxx 2021/06/05 13:23:17 kanai Exp $
//
// C++11 timer class based on std::chrono
//
// Copyright (c) 2021 Takashi Kanai
// Released under the MIT license
//
////////////////////////////////////////////////////////////////////

#ifndef _C11TIMER_HXX
#define _C11TIMER_HXX 1

#include <chrono>
#include <ctime>
#include <string>

class C11Timer {

public:

  static void ResetCount() {
    Single().reset_ = std::chrono::system_clock::now();
  };

  // リセット後の経過時間のミリ秒で取得(小数点以下)
  static double GetNowCount() {
    auto diff = std::chrono::system_clock::now() - Single().reset_;
    return (double)std::chrono::duration_cast<std::chrono::microseconds>(diff).count() / 1000;
  };

  // 日付を取得
  static void GetDate(std::tm* currentTime) {
    ::time_t timer;

    ::time(&timer);
#if defined(_WIN32) || defined(_WIN64)
    localtime_s(currentTime, &timer);
#else
    std::tm* local = ::localtime(&timer);
    if ( local )
      *currentTime = *local;
#endif
  };

  // 現在の日付、時刻を文字列にして返す
  static std::string GetDateString() {
    /* Not named "time": MSVC CRT #defines time -> _time64 etc., which breaks "std::tm time". */
    std::tm tmb;
    GetDate( &tmb );
    std::string str = std::to_string( tmb.tm_year + 1900 ) + "_"
      + std::to_string( tmb.tm_mon ) + "_"
      + std::to_string( tmb.tm_mday ) + "_"
      + std::to_string( tmb.tm_hour ) + "_"
      + std::to_string( tmb.tm_min ) + "_"
      + std::to_string( tmb.tm_sec );
    return str;
  };

  // FPS計測の更新と取得
  static double CheckGetFPS() {
    CheckFPS();
    return GetFPS();
  };

  // FPSを取得
  static double GetFPS() {
    return Single().fps_;
  };

  // FPSの計測開始
  static void ResetFPS() {
    Single().fpsCounter_ = std::chrono::system_clock::now();
  };

  // FPS計測を更新
  static void CheckFPS() {
    auto diff = std::chrono::system_clock::now() - Single().fpsCounter_;
    Single().fps_ = 1000000.0 / (double)std::chrono::duration_cast<std::chrono::microseconds>(diff).count();
    // automatically reset fpsCounter_
    ResetFPS();
  };

  // 処理時間の更新と取得
  static double CheckGetWatch( bool isReset ) {
    CheckWatch( isReset );
    return GetWatch();
  };

  // 処理時間取得
  static double GetWatch() {
    return Single().watch_;
  };

  // 処理時間計測開始
  static void ResetWatch() {
    Single().watchCounter_ = std::chrono::system_clock::now();
  };

  // 処理時間計測更新
  // StartWatch からの経過時間をミリ秒単位で描画
  // 続けてDrawWatchする事も可能
  static void CheckWatch( bool isReset ) {
    auto diff = std::chrono::system_clock::now() - Single().watchCounter_;
    Single().watch_ = (double)std::chrono::duration_cast<std::chrono::milliseconds>(diff).count() / 1000.0;
    if ( isReset ) ResetWatch();
  };

private:

  double fps_;
  double watch_;

  std::chrono::system_clock::time_point reset_;
  std::chrono::system_clock::time_point fpsCounter_;
  std::chrono::system_clock::time_point watchCounter_;

  static C11Timer& Single()
  {
    static C11Timer single_;
    return single_;
  };

};

#endif // _C11TIMER_HXX