FrameLimiter.cpp

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////////////////////////////////////////////////////////////////////////////////
//    Scorched3D (c) 2000-2009
//
//    This file is part of Scorched3D.
//
//    Scorched3D is free software; you can redistribute it and/or modify
//    it under the terms of the GNU General Public License as published by
//    the Free Software Foundation; either version 2 of the License, or
//    (at your option) any later version.
//
//    Scorched3D is distributed in the hope that it will be useful,
//    but WITHOUT ANY WARRANTY; without even the implied warranty of
//    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//    GNU General Public License for more details.
//
//    You should have received a copy of the GNU General Public License
//    along with Scorched3D; if not, write to the Free Software
//    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

#include <graph/FrameLimiter.h>
#include <graph/OptionsDisplay.h>
#include <SDL/SDL.h>

FrameLimiter::FrameLimiter()
{
}

FrameLimiter::~FrameLimiter()
{
}

void FrameLimiter::dontLimitFrameTime()
{
        unsigned int lastFrameTicks = frameTime_.getTicksDifference();
}

void FrameLimiter::limitFrameTime()
{
        unsigned int wantedFramesPerSecond = 
                (unsigned int) OptionsDisplay::instance()->getFramesPerSecondLimit();
        if (wantedFramesPerSecond == 0) return;

        unsigned int lastFrameTicks = frameTime_.getTicksDifference();
        unsigned int wantedTicksPerFrame = 1000 / wantedFramesPerSecond;

        if (wantedTicksPerFrame > lastFrameTicks)
        {
                SDL_Delay(wantedTicksPerFrame - lastFrameTicks);
                frameTime_.getTicksDifference(); // Remove time taken in delay
        }
}

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