1. Why Windows Phone 7 Game Development Marios Karagiannis

2. Who am I My name is Marios Karagiannis I am Greek I am not affiliated with Microsoft PhD Candidate @ UNIGE – In my last year Gamer – Since the Game & Watch era Games Developer – Made my first game on an 8-bit Atari 65 XE (on cassette) – Currently making games for Windows Phone 7 Mkaragia @ xbox live

3. WP7 Hardware All Windows Phone 7 phones must have as a minimum (called Chassis 1): – 4 points multi touch capacitive screens – 480x800 screen resolution – 1GHz CPU – Accelerometer – 256MB Ram – 8GB Storage – DirectX 9 GPU with video acceleration – 5 MP Camera with flash – A-GPS – Compass – Ambient and proximity sensors – 3 hardware keys (Back, Start, Search)

4. XNA What is XNA? – A set of tools specifically designed for game development – Managed runtime environment – For Windows Phone XBOX 360 Windows – (using almost the same code) – Originally for the XBOX it was called Xbox New Architecture) – After XBOX 360 it means XNA is Not an Acronym

5. Is XNA any good? Let me state this – Developing games with XNA is the best way to develop games in any platform, ever (did I say ever?) Why? – C# –.NET – Free and great tools (XNA Game Studio 4 and Visual Studio Express 2010) – Great libraries – Amazing documentation

6. Is XNA any good? Also comes with extra bonuses – Have you worked with XBOX 360 games? – You already know 99% of the things you need to know to make Windows Phone 7 games Apart from console specific or phone specific things – Change joypad to touch screen – Change screen resolution and adapt your content – Use accelerometer and touch screen – Wanna see how easy it is?

7. XNA for Windows Phone 7 Game loop vs event driven programming – Games play even when you don’t UpdateDraw

8. Game timing XNA lets you choose how you want timing to work in your game: – Fixed Time Step (default) TargetElapsedTime = TimeSpan.FromSeconds(1/30.0); Update Draw NO YES IsRunningSlowly = true Time for next update

9. Game timing XNA lets you choose how you want timing to work in your game: – Variable Time Step Be careful to use ElapsedGameTime (more traditional way to develop games) UpdateDraw

10. Content XNA provides a powerful content pipeline that can import and process: – Images (bmp, dib, hdr, jpg, pfm, png, ppm, tga) – Fonts (converted automatically to spritefonts) – XML – 3D models(fbx) – Music (mp3, wma) – Sounds (wav) – And custom processors (if you so wish) Assets are processed to xbl files Some assets can be compressed

11. Physics Although technically not part of the XNA you can easily compile and use the Farseer Physics Engine with your Windows Phone 7 games http://farseerphysics.codeplex.com/

12. Drawing (2D and 3D) One Draw method – You can render 3D objects and then 2D objects Or vice versa GPU hardwalre image scaler is free to use – The scaler is easy to use: just set graphics.PreferredBackBufferWidth and PreferredBackBufferHeight in your game constructor – The resolution can be anywhere from 240x240 up to a max of 800x480 (or 480x800 if you are making a portrait game) – If you choose a resolution that does not match the screen aspect ratio, it will be automatically letterboxed (black bars along the edges) – Touch input is automatically scaled to match your chosen backbuffer resolution – Scaling is implemented by dedicated hardware, so doesn't cost any GPU – Scaling uses a high quality filter (better looking than GPU bilinear filtering)

13. But you also get events Although XNA is game loop driven – You still get events Phone calls Battery down Etc. #if WINDOWS_PHONE PhoneApplicationService.Current.Launching+=Current_Launching; PhoneApplicationService.Current.Deactivated+=Current_Deactivating; PhoneApplicationService.Current.Activated+=Current_Activating; #endif

14. Phone Sensors With XNA you have control over – The vibration function – The accelerometer – The touch screen – The camera But not (yet) – The compass – The light and proximity sensors – Bluetooth

15. Let’s see how easy it is When you start a new Windows Phone 7 XNA Game everything is setup for you: Your Game class A spriteBatch object to draw sprites Your Graphics Devide Manager object Your Content root Your Initialize function Your LoadContent function Your UnloadContent function Your Update function Your Draw function UpdateDraw Start Initialize Load Content Unload Content Finish

16. An example How to use multi touch – Touch can detect Pressed, Moved, Released events – Is arranged in touch collections with unique IDs Remember you always have at least 4 touch multitouch // Process touch events TouchCollection touchCollection = TouchPanel.GetState(); foreach (TouchLocation tl in touchCollection) { if ((tl.State == TouchLocationState.Pressed) || (tl.State == TouchLocationState.Moved)) { // add sparkles based on the touch location sparkles.Add(new Sparkle(tl.Position.X, tl.Position.Y, tl.Id)); }

17. Another example How to use the accelerometer – Use a ReadingChanged event Read 3 axis data

18. Another example Accelerometer accelSensor; Vector3 accelReading = new Vector3(); public void AccelerometerReadingChanged(object sender, AccelerometerReadingEventArgs e) { accelReading.X = (float)e.X; accelReading.Y = (float)e.Y; accelReading.Z = (float)e.Z; } accelSensor = new Accelerometer(); // Add the accelerometer event handler to the accelerometer sensor. accelSensor.ReadingChanged += new EventHandler (AccelerometerReadingChanged); // Start the accelerometer try { accelSensor.Start(); accelActive = true; } catch (AccelerometerFailedException e) { // the accelerometer couldn't be started. No fun! accelActive = false; } catch (UnauthorizedAccessException e) { // This exception is thrown in the emulator-which doesn't support an accelerometer. accelActive = false; }

19. Another example // Start the accelerometer try { accelSensor.Start(); accelActive = true; } catch (AccelerometerFailedException e) { // the accelerometer couldn't be started. No fun! accelActive = false; } catch (UnauthorizedAccessException e) { // This exception is thrown in the emulator-which doesn't support an accelerometer. accelActive = false; } if (accelActive) { // accelerate the sparkle depending on accelerometer // action. s.speed.X += accelReading.X * ACCELFACTOR; s.speed.Y += -accelReading.Y * ACCELFACTOR; }

20. Another example //When the game is paused or accelerometer data is not needed // Stop the accelerometer if it's active. if (accelActive) { try { accelSensor.Stop(); } catch (AccelerometerFailedException e) { // the accelerometer couldn't be stopped now. }

21. Interested? Where to start The App Hub http://developer.windowsphone.com/ Windows Phone 7 Developer Training Kit http://create.msdn.com/en- US/education/catalog/article/wp7_training_kit Windows Phone 7 Jump Start http://create.msdn.com/en- US/education/catalog/article/wp7_jump_start Education http://create.msdn.com/en-US/education/

22. My latest game

24. Beyond game design Register as a developer – free for students, $99 per year for everyone else Read the certification guidelines Develop your app/game Test your game against guidelines Create the submission artwork Submit your app/game Cross your fingers and wait … Profit

25. General Tips Try to make something good – Original is one way to go – But anyway make something people want to use/play Every day if possible Try not to make something fast just for the fun of it – Except if you don’t really care about your app succeeding – And we have enough tip calculators, thanx

26. Marketplace Tips Read the guidelines carefully – Small things can get the app rejected Like not handling the Back button correctly Or having one of the artworks 1 pixel too big – You don’t want to wait a week just to find out you waited for nothing Test your app for bugs – Try anything you might think of – Give it to your friends, family etc to test stuff for you

27. If your app fails Microsoft will provide feedback – Fortunately, they provide very clear instructions on how to reproduce the problem that got your app rejected – Follow the steps, fix the problem(s) Test again your app Re-submit

28. Your app got accepted Congratulations This is just the beginning though Work hard to support your users with updates, bug fixes, new features etc – Listen to their feedback – Get ideas for expansions Advertise your app as hard as you can – People cannot buy your app if they don’t know it exists Promotion 101 is out of the scope of this talk

29. Is there money to be made? Short answer? – Maybe, but not yet While people may buy your game/app, and although the Marketplace is growing _really_ fast, it’s still small Unfortunately, you cannot make money from free apps/games and in-app advertising outside of the US But… …rapid market expansion is on the way! – Microsoft – Nokia deal – CDMA update (Sprint and Verizon in the US) And you want your app(s)/game(s) to be in there when the millions of user come… – …and they will come, the platform is usable, great and improving very fast – Not to mention that the developer tools are the best out there

30. Ideas/Help I am always open to discuss your ideas And help where I can Find me and these slides at www.kariosgames.com email@kariosgames.com

31. Thank you Now go make the next WP7 masterpiece