XNA2.0 Network Programming

Developing Cross-Platform Networked Game with XNA 2.0 Game Studio 2008. 5. 24. 김의열 (eykim@microsoft.com) Xbox & HW STE Microsoft Korea EDD R&D

Agenda ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

XNA & Cross-Platform Game Development (1) ,[object Object],LIVE Server PC Xbox360

XNA & Cross-Platform Game Development (2) ,[object Object],[object Object],[object Object],Framework Your Game

Preview: Net Rumble (DEMO) ,[object Object],[object Object],[object Object]

Preview: Net Rumble (FSM) GamerJoined GamerLeft GameStarted SessionEnded Create(…) StartGame() EndGame() Dispose() GameEnded HostChanged

Initiating Gamer Services ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Initiating Game Services: Code ,[object Object],[object Object],[object Object],using Microsoft.Xna.Framework.GamerServices … public NetRumbleGame() { … Components.Add(new GamerServicesComponent(this)); … } if (!Guide.IsVisible) { Guide.ShowSignIn(1, false); } bool signedIntoLive = false; if (Gamer.SignedInGamers.Count > 0) { foreach (SignedInGamer signedInGamer in Gamer.SignedInGamers) { if (signedInGamer.IsSignedInToLive) { signedIntoLive = true; break; } } State = signedIntoLive ? MainMenuState.SignedInLive : MainMenuState.SignedInLocal; } else { State = MainMenuState.SignedOut; }

Creating a Session ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Creating a Session – Network Requirements Xbox 360 Console Windows-Based Computer Run an XNA Framework Game LIVE Silver membership + Creators Club membership No memberships Required Use System Link LIVE Silver membership + Creators Club membership No memberships Required Sign-on to Xbox Live and Games for Windows - LIVE Servers LIVE Silver membership + Creators Club membership LIVE Silver membership + Creators Club membership Use LIVE Matchmaking LIVE Gold membership + Creators Club membership LIVE Gold membership + Creators Club membership

Creating a Session: Code (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],using Microsoft.Xna.Framework.Net; … enum SessionProperties { GameMode, ScoreToWin } enum GameMode { FreeForAll, CaptureTheFlag } … NetworkSessionProperties sessionProperties = new NetworkSessionProperties(); sessionProperties[(int)SessionProperties.GameMode] = (int)GameMode.FreeForAll; sessionProperties[(int)SessionProperties.ScoreToWin] = 1000; … NetworkSession session; int maxLocalGamers = 1; int maxGamers = 8; int privateGamerSlots =2; session = NetworkSession.Create(NetworkSessionType.SystemLink, maxLocalGamers, maxGamers, privateGamerSlots, sessionProperties); NetworkSession networkSession = null; … IAsyncResult asyncResult = NetworkSession.BeginCreate(sessionType, 1, World.MaximumPlayers, null, null); … if ((asyncResult != null) && asyncResult.IsCompleted) { networkSession = NetworkSession.EndCreate(asyncResult); … networkSession.AllowHostMigration = true; networkSession.AllowJoinInProgress = false; … }

Creating a Session: Code (2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],EventHandler<GameStartedEventArgs> gameStartedHandler; EventHandler<GamerJoinedEventArgs> gamerJoinedHandler; EventHandler<NetworkSessionEndedEventArgs> sessionEndedHandler; … public override void LoadContent() { … networkSession.GamerJoined += gamerJoinedHandler; networkSession.GameStarted += gameStartedHandler; networkSession.SessionEnded += sessionEndedHandler; … } … void networkSession_GamerJoined(object sender, GamerJoinedEventArgs e) { … } …

Finding and Joining a Session ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Finding and Joining a Session: Code (1) ,[object Object],[object Object],[object Object],using Microsoft.Xna.Framework.Net; … enum SearchProperties { GameMode, ScoreToWin } enum GameMode { FreeForAll, CaptureTheFlag } … NetworkSessionProperties searchProperties = new NetworkSessionProperties(); searchProperties[(int)SearchProperties.GameMode] = (int)GameMode.FreeForAll; searchProperties[(int)SearchProperties.ScoreToWin] = 1000; searchProperties[2] = 3; … AvailableNetworkSessionCollection availableSessions; int maxLocalGamers = 1; availableSessions = NetworkSession.Find(NetworkSessionType.PlayerMatch, maxLocalGamers, searchProperties); if (availableSessions != null) { foreach (AvailableNetworkSession availableSession in availableSessions) { if (availableSession.CurrentGamerCount < World.MaximumPlayers) { MenuEntries.Add(availableSession.HostGamertag + " (" + availableSession.CurrentGamerCount.ToString() + "/" + World.MaximumPlayers.ToString() + ")"); } } }

Finding and Joining a Session: Code (2) ,[object Object],[object Object],[object Object],NetworkSession session; … session = NetworkSession.Join(availableSessions[selectedSessionIndex]); EventHandler<GameStartedEventArgs> gameStartedHandler; EventHandler<GamerJoinedEventArgs> gamerJoinedHandler; EventHandler<NetworkSessionEndedEventArgs> sessionEndedHandler; … public override void LoadContent() { … networkSession.GamerJoined += gamerJoinedHandler; networkSession.GameStarted += gameStartedHandler; networkSession.SessionEnded += sessionEndedHandler; … } … void networkSession_GamerJoined(object sender, GamerJoinedEventArgs e) { … } …

Managing Players Joining and Leaving ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Managing Players Joining and Leaving: Code ,[object Object],[object Object],[object Object],[object Object],void networkSession_GamerJoined(object sender, GamerJoinedEventArgs e) { for (int i = 0; i < networkSession.AllGamers.Count; i++) { if (networkSession.AllGamers[i] == e.Gamer) { PlayerData playerData = new PlayerData(); e.Gamer.Tag = playerData; … } } // Code for broadcasting the new player information … } void networkSession_GamerLeft(object sender, GamerLeftEventArgs e) { PlayerData playerData = e.Gamer.Tag as PlayerData; if ((playerData != null) && (playerData.Ship != null)) { playerData.Ship.Die(null, true); // Remove the player } }

Managing Players from Lobby to Gameplay ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Managing Players from Lobby to Gameplay: Code ,[object Object],[object Object],[object Object],[object Object],if (!networkSession.LocalGamers[0].IsReady) { MenuEntries[0] = "Press X to Mark as Ready"; } else if (!networkSession.IsEveryoneReady) { MenuEntries[0] = "Waiting for all players to mark as ready..."; } else if (!networkSession.IsHost) { MenuEntries[0] = "Waiting for the host to start game..."; } else { MenuEntries[0] = "Starting the game..."; networkSession.StartGame(); } void networkSession_GameStarted(object sender, GameStartedEventArgs e) { if ((networkSession != null) && networkSession.IsHost && (world != null)) { world.GenerateWorld(); } }

Sending & Receiving Data: Network Topology ,[object Object],[object Object],[object Object],[object Object],[object Object]

Sending & Receiving Data ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Sending & Receiving Data: Code (1) ,[object Object],[object Object],[object Object],[object Object],[object Object],PacketWriter packetWriter = new PacketWriter(); … PlayerData playerData = networkSession.LocalGamers[0].Tag as PlayerData; if ((playerData != null) && (playerData.Ship != null)) { packetWriter.Write((int)World.PacketTypes.ShipData); packetWriter.Write(playerData.Ship.Position); packetWriter.Write(playerData.Ship.Velocity); packetWriter.Write(playerData.Ship.Rotation); packetWriter.Write(playerData.Ship.Life); packetWriter.Write(playerData.Ship.Shield); packetWriter.Write(playerData.Ship.Score); networkSession.LocalGamers[0].SendData(packetWriter, SendDataOptions.InOrder); } void networkSession_GamerJoined(object sender, GamerJoinedEventArgs e) { … if ((networkSession.LocalGamers.Count > 0) && !e.Gamer.IsLocal) { PlayerData playerData=networkSession.LocalGamers[0].Tag as PlayerData; if (playerData != null) { packetWriter.Write((int)World.PacketTypes.PlayerData); … networkSession.LocalGamers[0].SendData(packetWriter, SendDataOptions.ReliableInOrder, e.Gamer); } } }

Sending & Receiving Data: Code (2) ,[object Object],[object Object],[object Object],[object Object],PacketReader packetReader = new PacketReader(); … while (networkSession.LocalGamers[0].IsDataAvailable) { NetworkGamer sender; networkSession.LocalGamers[0].ReceiveData(packetReader, out sender); PacketTypes packetType = (PacketTypes)packetReader.ReadInt32(); switch (packetType) { … case PacketTypes.ShipData: if ((sender != null) && !sender.IsLocal) { UpdateShipData(sender); } break; case PacketTypes.WorldData: if (!networkSession.IsHost && Initialized) { UpdateWorldData(); } break; … } }

Latency & Packet Loss Simulation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Ending the Game ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Ending the Game: Code ,[object Object],[object Object],[object Object],[object Object],void networkSession_GameEnded(object sender, GameEndedEventArgs e) { if ((world != null) && !world.GameWon && !world.GameExited) { world.GameExited = true; } if (!IsExiting && ((world == null) || world.GameExited)) { … } } … if (world.GameExited) { … if (world != null) { world.Dispose(); world = null; } if (networkSession != null) { networkSession.Dispose(); networkSession = null; } … } switch (packetType) { … case PacketTypes.GameWon: … if (networkSession.IsHost && (networkSession.SessionState == NetworkSessionState.Playing)) { networkSession.EndGame(); } break; }

DEMO ,[object Object],[object Object],[object Object]

TIP 1: Control & Balance ,[object Object],[object Object],GamePadState gamePad; KeyboardState keyboard; … protected override void Update(GameTime gameTime) { gamePad = GamePad.GetState(PlayerIndex.One); keyboard = Keyboard.GetState(); gamePadUp = gamePad.DPad.Up == ButtonState.Pressed || gamePad.ThumbSticks.Left.Y > 0.5f; gamePadDown = gamePad.DPad.Down == ButtonState.Pressed || gamePad.ThumbSticks.Left.Y < -0.5f; float moveFactorPerSecond = 0.5f * (float)gameTime.ElapsedRealTime.TotalMilliseconds/1000.0f; if (gamePadUp || keyboard.IsKeyDown(Keys.Up)) rightPaddlePosition -= moveFactorPerSecond; if (gamePadDown || keyboard.IsKeyDown(Keys.Down)) rightPaddlePosition += moveFactorPerSecond; … } ?

TIP 2: SafeArea ,[object Object],[object Object],[object Object],[object Object],[object Object],SafeArea

TIP 3: No Foreign References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Q & A ,[object Object],[object Object],[object Object]

XNA2.0 Network Programming

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