![XNA Game Studio 2.0
Game Programming Made Easy(ier)
Reuben Ahmed
[February 12, 2008]](https://image.slidesharecdn.com/56f68ad5-619e-4b16-b0c1-7f727dac8260-160205110301/85/XNAPresentation-1-320.jpg)
XNAPresentation
- 1. XNA Game Studio 2.0 Game Programming Made Easy(ier) Reuben Ahmed [February 12, 2008]
- 2. About Me • 7 years of .NET/C# • Minimal game programming experience • Avid video game player – *Not reflected in my XBOX Live gamer score • rahmed@bennettadelson.com
- 3. WARNING • Disclaimer: Code shown during this presentation is not meant to be the “right” or “best” way of creating a game. • Purpose: Give you a basic toolset to start off with XNA.
- 4. Agenda • What is XNA? • System Requirements • Out of the box architecture • Graphics/Textures • Input • Collision Detection • Text Writing • Audio • XBOX 360 Deployment (!) • Distribution model • Q & A
- 5. What is XNA? • X-Platform Next Generation Architecture • C# Game Framework – Windows/XBOX 360 – Reduced learning curve – Compiles to .NET Compact Framework – Available, Approachable, and nearly Free • Sony Playstation 3 Dev. Kit = ~$10,500 • XNA is free on Windows. • $49/4 months or $99/year on XBOX 360.
- 6. System Requirements • What is XNA? • System Requirements • Out of the box architecture • Graphics/Textures • Input • Collision Detection • Text Writing • Audio • XBOX 360 Deployment • Distribution model • Q & A
- 7. System Requirements • Visual C# 2005 Express Edition, Standard Edition, Professional Edition , Team Edition for Software Architects, Team Edition for Software Developers, Team Edition for Software Testers, Team Edition for Database Professionals , Team Suite • No Visual Studio 2008 support currently! • DirectX 9.0c, Pixel Shader 1.1+ XNA Studio 2.0 and C# Express URL: • http://creators.xna.com/Education/newtoxna.aspx
- 8. Out of the box architecture • What is XNA? • System Requirements • Out of the box architecture • Graphics/Textures • Input • Collision Detection • Audio • XBOX 360 Deployment • Distribution model • Q & A
- 9. Out of the box architecture • Graphics Device Manager – Automatically sets up interaction with your graphics card • Optimized Game Loop – Update, Draw methods • Content Pipeline – Game Assets (Graphics, Audio, etc.) • DEMO: Our First XNA Game! – Change background color
- 10. Graphics/Textures • What is XNA? • System Requirements • Out of the box architecture • Graphics/Textures • Input • Collision Detection • Text Writing • Audio • XBOX 360 Deployment • Distribution model • Q & A
- 11. Graphics/Textures – Drawing 1) Add Asset to your project – Drag and drop graphic 2) Load Graphic into variable – Texture2D class – Content Pipeline method • Content.Load <Texture2D> (“AssetName”); 3) Draw it – SpriteBatch class • SpriteBatch.Draw (Texture2D, Position, Color);
- 12. • DEMO: Adding a spaceship graphic! • DEMO: Tint graphic with Draw parameter. Graphics/Textures - Demo
- 13. • Vector2 class – Holds X and Y position – Can represent Position, Acceleration, Velocity Graphics – 2D Coordinates
- 14. • GraphicsDevice.Viewport – Window size properties • DEMO: Centering graphic with Vector2! • Tip: Texture is drawn with upper left as starting point… GraphicsGraphics – Window Size
- 15. • DEMO: Scale image with Rectangles. • Tip: Draw order matters! GraphicsGraphics – Scale
- 16. Input • What is XNA? • System Requirements • Out of the box architecture • Graphics/Textures • Input • Collision Detection • Text Writing • Audio • XBOX 360 Deployment • Distribution model • Q & A
- 17. • Keyboard – Static class • Current state of keyboard • Which keys are pressed • Keys – Enumerator – Represents almost any key! • DEMO: Read input to exit game. Input – Read Keys
- 18. • Vector2 – (X,Y) can also represent velocity • Vectors can be added/subtracted… • Vector of (0,0) position + Vector of (5, 2) velocity = new position of (5, 2). Input – Vector2 Velocity
- 19. • DEMO: Move ship to right. • DEMO: Use Keyboard to move ship left/right. Input – Vector2 Velocity
- 20. Collision Detection • What is XNA? • System Requirements • Out of the box architecture • Graphics/Textures • Input • Collision Detection • Text Writing • Audio • XBOX 360 Deployment • Distribution model • Q & A
- 21. • My ship is going off the screen! • First level of collision detection: – Window boundaries – MathHelper class to the rescue… • Clamp() method. • DEMO: MathHelper.Clamp() to boundaries. Collision Detection
- 22. • Let’s add an “enemy”…remember: – Texture2D – Vector2 (position) – Vector2 (velocity) – MathHelper.Clamp (Window Boundaries) • DEMO: Add a non-hostile Alien that eerily resembles a Space Invader™! Collision Detection
- 23. • Can we shoot a bullet? – Bullet spawns from spaceship position. – Moves vertically up (negative Y direction) • DEMO: Kill it, KILL IT! Collision Detection
- 24. • My bullets are too weak! – Rectangles encompass every Texture. – Rectangle.Intersects will help! • DEMO: Encompass the alien and bullet in rectangles, and figure out if they collided… Collision Detection
- 25. • 2D Per-Pixel Collision – More expensive, but accurate • Color Key Collision – Detects collision based on color map! Collision Detection, etc.
- 26. Text Writing • What is XNA? • System Requirements • Out of the box architecture • Graphics/Textures • Input • Collision Detection • Text Writing • Audio • XBOX 360 Deployment • Distribution model • Q & A
- 27. Text Writing • SpriteFont asset • SpriteBatch.DrawString() • DEMO: Keep a bullet hit count label…
- 28. Audio • What is XNA? • System Requirements • Out of the box architecture • Graphics/Textures • Input • Collision Detection • Text Writing • Audio • XBOX 360 Deployment • Distribution model • Q & A
- 29. Audio • Microsoft Cross Platform Audio Creation Tool – Creates a .XAP “Game Asset” – .WAV files • Classes – audioEngine = new AudioEngine ("ContentAudioPROJECTNAME.xgs"); – waveBank = new WaveBank (audioEngine, "ContentAudioWave Bank.xwb"); – soundBank = new SoundBank (audioEngine, "ContentAudioSound Bank.xsb"); – soundBank.PlayCue (“CUENAME"); • DEMO: Background music. Loop it.
- 30. • Change volume level • 3D Spatial audio! Audio, etc.
- 31. XBOX 360 Deployment • What is XNA? • System Requirements • Out of the box architecture • Graphics/Textures • Input • Collision Detection • Text Writing • Audio • XBOX 360 Deployment • Distribution model • Q & A
- 32. XBOX 360 Deployment • This costs money! • Download XNA Creator’s License ($49 or $99) from the Games Blade. • Download/Launch XNA Game Studio Connect (Free) from the Games Blade. • Generate a key that your PC can use to connect to your XBOX360…this only has to be done once.
- 34. XBOX 360 Deployment • Launch XGS Device Center on your PC.
- 35. • Your console is now connected! XBOX 360 Deployment
- 36. • Either an XBOX 360 Project Type, OR a Windows XNA Project Type can be deployed! • DEMO: Demonstrate “Copy Windows Project to XBOX360 Project” • Projects stay in sync. • DEMO: Add GamePad input handling. Add rumble! XBOX 360 Deployment
- 37. • DEMO: …Deploy this thing. – Incremental deployment support! – No wireless deployment. – Your game is now available on the Games Blade! • DEMO: Debugging on XBOX 360… XBOX 360 Deployment
- 38. Distribution Model • What is XNA? • System Requirements • Out of the box functionality • Graphics/Textures • Input • Collision Detection • Text Writing • Audio • XBOX 360 Deployment • Distribution model • Q & A
- 40. • XBL currently a managed portfolio • Game Developer’s Conference 2008 – Microsoft prepared to announce XBL Community Blade for XNA. Distribution Model
- 41. Tip of the iceberg… • Plethora of XNA Tutorials/Starter Kits • Network Architecture – Client/Server, Peer to Peer, Prediction Code – XBOX Live Profile information • Artificial Intelligence – State Management samples • Speech Recognition/Synthesis – System.Speech .NET 3.0
- 42. Tip of the iceberg… • XNA Racing Game: YouTube • 1 week of code (professional game development company) • Jitted on the fly, 1080p, 30 FPS, running on C# (Managed code!), with 2X Anti aliasing! • Graphics power is equated to a $350 PC video card. Anti aliasing…one line of code via XNA.
- 43. References • MSDN XNA Game Studio 2.0 – Overview of framework • http://creators.xna.com/ – Active community site • http://www.xnadevelopment.com/ – Beginner tutorials • http://www.phstudios.com/ – Introadvanced tutorials
- 44. Q & A • What is XNA? • System Requirements • Out of the box architecture • Graphics/Textures • Input • Collision Detection • Text Writing • Audio • XBOX 360 Deployment • Distribution model • Q & A
Editor's Notes
- #46: Who owns or has played an XBOX 360? Who has done any directX/openGL or graphics development? Performance characteristics of an XBOX 1 can be done XBOX Symbol for development: ms-help://MS.VSCC.v80/MS.VSIPCC.v80/MS.XNAGS.1033/XNA/UsingXNA_XboxProgramming.htm Dream Build Play (2008) http://www.dreambuildplay.com/main/default.aspx Prizes: An invitation to show your entry at GDC 2008. An interview for an internship at Microsoft Research, Lionhead Studios or Rare Ltd in the UK.