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clocker.cpp

//FILE:         clocker.cpp
//AUTHOR:       Nathan Cournia <nathan@courina.com>

#include "clocker.h"

clocker::clocker( void ): m_elapsed( 0.0 )
{
#ifdef HAVE_SDL
        last = SDL_GetTicks( );
#else
        clock = new struct timeval;
        now = new struct timeval;
        gettimeofday( clock, 0 );
#endif
}

clocker::~clocker( void )
{
#ifndef HAVE_SDL
        delete clock;
        delete now;
#endif
}

void
clocker::reset( void )
{
        m_elapsed = 0.0;
#ifndef HAVE_SDL
        gettimeofday( clock, 0 );
#else
        last = SDL_GetTicks( );
#endif
}

void
clocker::update( void )
{
#ifdef HAVE_SDL
        Uint32 now = SDL_GetTicks( );
        m_elapsed = (now - last) / 1000.0;
        if( m_elapsed < 0.0 ) {
                m_elapsed = 0.0;
        }
        last = now;
#else
        gettimeofday( now, 0 );
        m_elapsed = ((double)(now->tv_usec - clock->tv_usec)) / 1000000.0;
        if( m_elapsed < 0.0 ) {
                m_elapsed = 0.0;
        }

        //swap
        struct timeval *tmp;
        tmp = now;
        now = clock;
        clock = tmp;
#endif
}

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