genesis-3d_engine/Engine/foundation/timing/android/androidtimer.cc

/****************************************************************************
Copyright (c) 2011-2013,WebJet Business Division,CYOU
 
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#ifdef __ANDROID__
#include "stdneb.h"
#include "timing/android/androidtimer.h"
#include <time.h>
#include <sys/time.h>

namespace Android
{
    AndroidTimer::AndroidTimer()
	:running(false),
    diffTime(0.0),
    stopTime(0)
    {
        
    }
    
    //------------------------------------------------------------------------------
    /**
     Start the timer. This will update the diffTime member to reflect
     the accumulated time when the timer was not running (basically the
     difference between this timer's time and the real system time).
     */
    void
    AndroidTimer::Start()
    {
        struct timeval tv;
        gettimeofday(&tv, NULL);
        
        Timing::Time curTime   = ConvertLinuxTime(tv.tv_sec, tv.tv_usec);
        this->diffTime += curTime - this->stopTime;
        this->stopTime  = 0.0f;
        this->running   = true;
    }
    
    //------------------------------------------------------------------------------
    /**
     Stop the timer. This will record the current realtime, so that
     the next Start() can measure the time lost between Stop() and Start()
     which must be taken into account to keep track of the difference between
     this timer's time and realtime.
     */
    void
    AndroidTimer::Stop()
    {
        struct timeval tv;
        gettimeofday(&tv, NULL);
        
        this->stopTime = ConvertLinuxTime(tv.tv_sec, tv.tv_usec);
        this->running = false;
    }
    
    //------------------------------------------------------------------------------
    /**
     Reset the timer so that will start counting at zero again.
     */
    void
    AndroidTimer::Reset()
    {
        bool wasRunning = this->running;
        if (wasRunning)
        {
            this->Stop();
        }
        this->stopTime = 0.0f;
        this->diffTime = 0.0f;
        if (wasRunning)
        {
            this->Start();
        }
    }
    
    //------------------------------------------------------------------------------
    /**
     Returns true if the timer is currently running.
     */
    bool
    AndroidTimer::Running() const
    {
        return this->running;
    }
    
    Timing::Time
    AndroidTimer::InternalTime() const
    {
        
        Timing::Time time;
        
        struct timeval tv;
        gettimeofday(&tv, NULL);
        
        if (this->running)
        {
            // we are running, query current time
            time = ConvertLinuxTime(tv.tv_sec, tv.tv_usec);
        }
        else
        {
            // we are stopped, use time at last stop
            time = this->stopTime;
        }
        
        // convert to local time
        time -= this->diffTime;
         
        return time;
    }
    
    //------------------------------------------------------------------------------
    /**
     This returns the timer's current time in seconds.
     */
    Timing::Time
    AndroidTimer::GetTime() const
    {
        Timing::Time seconds = this->InternalTime();
        
        return (Timing::Time)seconds;
    }
    
    //------------------------------------------------------------------------------
    /**
     This returns the timer's current time in "ticks". A tick is defined
     as one millisecond (1/1000 seconds).
     */
    Timing::Tick
    AndroidTimer::GetTicks() const
    {
        Timing::Time seconds = this->InternalTime();
        return (Timing::Tick)(1000 * seconds);
    }

	//------------------------------------------------------------------------------
    /**
     This returns the timer's current time in "ticks". A tick is defined
     as one millisecond (1/1000 seconds).
     */
    Timing::MicrosecondTick
    AndroidTimer::GetusTicks()
    {
		struct timeval tv;
		gettimeofday(&tv, NULL);  
		// we are running, query current time
		return Timing::MicrosecondTick(tv.tv_sec) * 1000 * 1000 + Timing::MicrosecondTick(tv.tv_usec);
    }
    
    Timing::Time AndroidTimer::ConvertLinuxTime(const long& sec, const long& nsec) const
    {
        return (Timing::Time(sec) + Timing::Time(nsec) / (1000 * 1000) );
    }
    
}

#endif