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