private void AppLoop()
{
//http://gafferongames.com/game-physics/fix-your-timestep/
var accumulator = 0.0;
var currentTime = _timer.ElapsedMilliseconds;
while (_running)
{
var newTime = _timer.ElapsedMilliseconds;
var frameSpan = Math.Min(newTime - currentTime, MaxMillisecondsUpdate);
accumulator += frameSpan;
currentTime = newTime;
while (accumulator >= MillisecondsPerFrame)
{
_currentAppState.UpdatePhysics(MillisecondsPerFrame);
accumulator -= MillisecondsPerFrame;
}
Render(accumulator / MillisecondsPerFrame);
var cur = (int)(_timer.ElapsedMilliseconds - currentTime);
if (cur < MillisecondsPerFrame)
{
Thread.Sleep((int)MillisecondsPerFrame - cur);
}
}
}