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/*
* FramerateManager.h, part of VCMI engine
*
* Authors: listed in file AUTHORS in main folder
*
* License: GNU General Public License v2.0 or later
* Full text of license available in license.txt file, in main folder
*
*/
#pragma once
/// Framerate manager controls current game frame rate by constantly trying to reach targeted frame rate
class FramerateManager
{
using Clock = boost::chrono::high_resolution_clock;
using TimePoint = Clock::time_point;
using Duration = Clock::duration;
/// cyclic buffer of durations of last frames
std::array<Duration, 60> lastFrameTimes;
Duration targetFrameTime;
TimePoint lastTimePoint;
/// index of last measured from in lastFrameTimes array
ui32 lastFrameIndex;
bool vsyncEnabled;
public:
FramerateManager(int targetFramerate);
/// must be called every frame
/// updates framerate calculations and executes sleep to maintain target frame rate
void framerateDelay();
/// returns duration of last frame in seconds
ui32 getElapsedMilliseconds() const;
/// returns current estimation of frame rate
ui32 getFramerate() const;
};
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