#include <Windows.h>


class Time
{
public:
    Time( unsigned int updatesPerSecond )
    {
        QueryPerformanceFrequency( &frequency );

        timePerUpdate = 1000000 / updatesPerSecond;

        QueryPerformanceCounter( &updateTime );
        updateTime.QuadPart /= frequency.QuadPart * 1000000;
    }


    void UpdateFrame()
    {
        QueryPerformanceCounter( &currentTime );
        currentTime.QuadPart /= frequency.QuadPart * 1000000;
    }

    bool Update()
    {
        if ( currentTime.QuadPart - updateTime.QuadPart > timePerUpdate )
        {
            updateTime.QuadPart += timePerUpdate;

            return true;
        }

        return false;
    }


    LONGLONG GetDeltaTime()
    {
        return timePerUpdate;
    }

private:
    LARGE_INTEGER frequency;

    unsigned int timePerUpdate;

    LARGE_INTEGER updateTime, currentTime;
};


void Update( LONGLONG );


int main()
{
    bool running;
    Time time( 30 );

    running = true;

    while ( running )
    {
        time.UpdateFrame();

        while ( time.Update() )
            Update( time.GetDeltaTime() );
    }

    return 0;
}