// Sends information about the current game state to the players
// resendTimeout is how long to wait until sending another GameStatePacket
private void _sendGameState(PlayerInfo player, TimeSpan resendTimeout)
{
if (DateTime.Now >= (player.LastPacketSentTime.Add(resendTimeout)))
{
// Set the data
GameStatePacket gsp = new GameStatePacket();
gsp.LeftY = LeftPlayer.Paddle.Position.Y;
gsp.RightY = RightPlayer.Paddle.Position.Y;
gsp.BallPosition = _ball.Position;
gsp.LeftScore = LeftPlayer.Paddle.Score;
gsp.RightScore = RightPlayer.Paddle.Score;
_sendTo(player, gsp);
}
}
protected override void Update(GameTime gameTime)
{
// Check for close
KeyboardState kbs = Keyboard.GetState();
if (kbs.IsKeyDown(Keys.Escape))
{
// Player wants to quit, send a ByePacket (if we're connected)
if ((_state == ClientState.EstablishingConnection) ||
(_state == ClientState.WaitingForGameStart) ||
(_state == ClientState.InGame))
{
// Will trigger the network thread to send the Bye Packet
_sendBye.Value = true;
}
// Will stop the network thread
_running.Value = false;
_state = ClientState.GameOver;
Exit();
}
// Check for time out with the server
if (_timedOut())
{
_state = ClientState.GameOver;
}
// Get message
NetworkMessage message;
bool haveMsg = _incomingMessages.TryDequeue(out message);
// Check for Bye From server
if (haveMsg && (message.Packet.Type == PacketType.Bye))
{
// Shutdown the network thread (not needed anymore)
_running.Value = false;
_state = ClientState.GameOver;
}
switch (_state)
{
case ClientState.EstablishingConnection:
_sendRequestJoin(TimeSpan.FromSeconds(1));
if (haveMsg)
{
_handleConnectionSetupResponse(message.Packet);
}
break;
case ClientState.WaitingForGameStart:
// Send a heartbeat
_sendHeartbeat(TimeSpan.FromSeconds(0.2));
if (haveMsg)
{
switch (message.Packet.Type)
{
case PacketType.AcceptJoin:
// It's possible that they didn't receive our ACK in the previous state
_sendAcceptJoinAck();
break;
case PacketType.HeartbeatAck:
// Record ACK times
_lastPacketReceivedTime = message.ReceiveTime;
if (message.Packet.Timestamp > _lastPacketReceivedTimestamp)
{
_lastPacketReceivedTimestamp = message.Packet.Timestamp;
}
break;
case PacketType.GameStart:
// Start the game and ACK it
_sendGameStartAck();
_state = ClientState.InGame;
break;
}
}
break;
case ClientState.InGame:
// Send a heartbeat
_sendHeartbeat(TimeSpan.FromSeconds(0.2));
// update our paddle
_previousY = _ourPaddle.Position.Y;
_ourPaddle.ClientSideUpdate(gameTime);
_sendPaddlePosition(_sendPaddlePositionTimeout);
if (haveMsg)
{
switch (message.Packet.Type)
{
case PacketType.GameStart:
// It's possible the server didn't receive our ACK in the previous state
_sendGameStartAck();
break;
case PacketType.HeartbeatAck:
// Record ACK times
_lastPacketReceivedTime = message.ReceiveTime;
if (message.Packet.Timestamp > _lastPacketReceivedTimestamp)
{
_lastPacketReceivedTimestamp = message.Packet.Timestamp;
}
break;
case PacketType.GameState:
// Update the gamestate, make sure its the latest
if (message.Packet.Timestamp > _lastPacketReceivedTimestamp)
{
_lastPacketReceivedTimestamp = message.Packet.Timestamp;
GameStatePacket gsp = new GameStatePacket(message.Packet.GetBytes());
_left.Score = gsp.LeftScore;
_right.Score = gsp.RightScore;
_ball.Position = gsp.BallPosition;
// Update what's not our paddle
if (_ourPaddle.Side == PaddleSide.Left)
{
_right.Position.Y = gsp.RightY;
}
else
{
_left.Position.Y = gsp.LeftY;
}
}
break;
case PacketType.PlaySoundEffect:
#if CAN_PLAY_SOUNDS
// Play a sound
PlaySoundEffectPacket psep = new PlaySoundEffectPacket(message.Packet.GetBytes());
if (psep.SFXName == "ball-hit")
{
_ballHitSFX.Play();
}
else if (psep.SFXName == "score")
{
_scoreSFX.Play();
}
#endif
break;
}
}
break;
case ClientState.GameOver:
// Purgatory is here
break;
}
base.Update(gameTime);
}