dolphin/Source/Core/VideoCommon/FPSCounter.h

// Copyright 2008 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.

#pragma once

#include <fstream>

#include "Common/CommonTypes.h"

class FPSCounter
{
public:
  // Initializes the FPS counter.
  FPSCounter();

  // Called when a frame is rendered (updated every second).
  void Update();

  float GetFPS() const { return m_fps; }
private:
  u64 m_last_time = 0;
  u64 m_time_since_update = 0;
  u32 m_frame_counter = 0;
  float m_fps = 0;
  std::ofstream m_bench_file;

  void LogRenderTimeToFile(u64 val);
};