protected override void OnRenderFrame(FrameEventArgs e)
{
base.OnRenderFrame(e);
// FIXME: Since Game.Exit may be called during an Update loop (and
// in fact that is quite likely to happen), this code is now
// littered with checks to _platform.IsRunning. It would be
// nice if there weren't quite so many. The move to a
// Game.Tick-centric architecture may eliminate this problem
// automatically.
if (_game != null)
{
_now = DateTime.Now;
if (_isFirstTime)
{
// Initialize GameTime
_updateGameTime = new GameTime();
_drawGameTime = new GameTime();
_lastUpdate = DateTime.Now;
_isFirstTime = false;
}
if (_needsToResetElapsedTime)
{
_drawGameTime.ResetElapsedTime();
_needsToResetElapsedTime = false;
}
// Try to catch up with frames
_drawGameTime.Update(_now - _lastUpdate);
TimeSpan catchup = _drawGameTime.ElapsedGameTime;
if (catchup > _game.TargetElapsedTime)
{
while (catchup > _game.TargetElapsedTime)
{
//Console.WriteLine("Catching up " + (catchup - _game.TargetElapsedTime));
catchup -= _game.TargetElapsedTime;
_drawGameTime.ElapsedGameTime = _game.TargetElapsedTime;
if (_platform.IsRunning)
{
_game.DoUpdate(_drawGameTime);
}
_extraElapsedTime += catchup;
}
if (_extraElapsedTime > _game.TargetElapsedTime)
{
//Console.WriteLine("FastForward " + _extraElapsedTime);
if (_platform.IsRunning)
{
_game.DoUpdate(_drawGameTime);
}
_extraElapsedTime = TimeSpan.Zero;
}
}
else
{
if (_platform.IsRunning)
{
_game.DoUpdate(_drawGameTime);
}
}
//Console.WriteLine("Render " + _drawGameTime.ElapsedGameTime);
// _game.DoUpdate(_drawGameTime);
if (_platform.IsRunning)
{
_game.DoDraw(_drawGameTime);
}
_lastUpdate = _now;
}
}
