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42 lines
852 B
C++
42 lines
852 B
C++
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/*
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* SDL_framerate.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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#include "../stdafx.h"
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#include "SDL_framerate.h"
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#include <SDL.h>
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FPSManager::FPSManager(int rate)
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{
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this->rate = rate;
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this->rateticks = (1000.0 / (double) rate);
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this->fps = 0;
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}
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void FPSManager::init()
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{
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this->lastticks = SDL_GetTicks();
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}
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void FPSManager::framerateDelay()
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{
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Uint32 currentTicks = SDL_GetTicks();
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double diff = currentTicks - this->lastticks;
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if (diff < this->rateticks) // FPS is higher than it should be, then wait some time
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{
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SDL_Delay(ceil(this->rateticks) - diff);
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}
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this->fps = ceil(1000. / (SDL_GetTicks() - this->lastticks));
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this->lastticks = SDL_GetTicks();
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}
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