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Timer.cpp

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/*
    TEDDY - General graphics application library
    Copyright (C) 1999-2002  Timo Suoranta
    tksuoran@cc.helsinki.fi

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    $Id: Timer.cpp,v 1.6 2002/02/16 12:41:39 tksuoran Exp $
*/


#include "Teddy/SysSupport/Timer.h"
#include "Teddy/SysSupport/StdSDL.h"


namespace Teddy      {
namespace SysSupport {


Timer::Timer( Uint32 frequency ){
    this->frequency  = frequency;
    this->running    = false;
    this->sdl_thread = SDL_CreateThread( Timer::sdl_thread_function, this );
}


Uint32 Timer::getFrequency(){
    return frequency;
}


void Timer::setFrequency( Uint32 frequency ){
    this->frequency = frequency;
}


/*virtual*/ void Timer::start(){
    sync    = SDL_GetTicks();
    running = true;
}


/*virtual*/ void Timer::stop(){
    running = false;
}


void Timer::run(){
    
    for(;;){
        while( running==false ) SDL_Delay( 10 );
        sync += frequency;
        for(;;){
            Uint32 now  = SDL_GetTicks(); if( now  > sync ) break;
            Uint32 diff = sync-now;       if( diff < 10   ) break;
            SDL_Delay( 10 );
        }
        tick();
    }

}


/*virtual*/ void Timer::tick(){
}


int Timer::sdl_thread_function( void *data ){
    Timer *t = (Timer *)( data );

    t->run();
    return 0;
}


};  //  namespace SysSupport
};  //  namespace Teddy