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C# Game Development with XNA

C# Game Development with XNA. Philip Degarmo. Introduction. What is XNA? Microsoft’s replacement for “Managed DirectX” “XNA” = “XNA Game Studio” – de facto but wrong All VS SKUs supported (including express) Only C# supported Who am I? Texas A&M 5 th year senior CS major

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C# Game Development with XNA

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  1. C# Game Development with XNA Philip Degarmo

  2. Introduction • What is XNA? • Microsoft’s replacement for “Managed DirectX” • “XNA” = “XNA Game Studio” – de facto but wrong • All VS SKUs supported (including express) • Only C# supported • Who am I? • Texas A&M 5th year senior CS major • Lead Developer for a Microsoft DreamBuildPlay finalist game, “Sprockets of Strife” • http://www.teamsprockets.com

  3. Purpose of XNA • Make game development easier and faster for the hobbyist developer

  4. Basic Features • XBOX*/Windows cross-platform abstraction • Graphics • Sound • Input • Networking • and many other things • Limited Zune Support (3.0 preview only) • XBOX Live Publishing • “Community Games” • Commercial • * - XBOX development costs $99/year or $49/4 months. PC development and all tools are completely free.

  5. Setup • Download from creators.xna.com • Run the installer • XNA Game Studio 2.0 requires VS 2005 SP1, any SKU (including express) • XNA Game Studio 3.0 preview requires 2008, any SKU (including express)

  6. How can XNA be used? • Visualization • GPGPU • Skill Building

  7. Visualization • Very easy to integrate your C# code into an XNA application • Possible to integrate with .net Windows Forms

  8. GPGPU • General purpose use of the GPU • Massively parallel stream processing • Becoming more common in everyday desktop computers • XNA Graphics is a very thin abstraction • API calls are fairly direct • API calls closely mirror C++/DirectX • HLSL is compiled and runs on the GPU • MUCH easier to play with the GPU than it is in C++

  9. Getting Skills • Practice with performance-sensitive C# • Opportunities to learn some very cool algorithms • Spatial Partitioning (BSP/Octrees) • Path Finding • Portfolio work

  10. XNA Shortcommings • XBOX Performance • 4 cores.. 3.2 GHz.. No problem right? • No out-of-order execution • Compact framework GC, stiffer penalties for collection and creation • Object pools can alleviate this • Inlining isn’t as good as PC • Manual inlining can potentially yield a major speed improvement in a pinch

  11. Outlook • Adoption by games industry • Some in tools, casual games • No big $$$$ games – but that’s not XNA’s purpose! • Long term support • Replaces “Managed DirectX”

  12. Resources • aclysma at gmail dot com • http://creators.xna.com/ • http://forums.xna.com/

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