Designing a Component-based Architecture in Lua for Game Apps

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http://www.monkeypotion.com/devblog/designing-a-component-based-architecture-in-lua-for-game-apps/

Transcript

1. Designing a Component- based Architecture in Lua for Game Apps 半路 / Jheng Wei Ciao
2. Pitfalls in Object-Oriented Design ?!
3. Traditional OOD Object-Oriented Design Class Inheritance Virtualization Polymorphism Inheritance-based Architecture
4. Player Enemy
5. Actor Player Enemy
6. Actor WalkableObject Player Enemy
7. CollidableObject FlyableObject Player Enemy Actor WalkableObject
8. CollidableObject FlyableObject FlyingEnemy Actor WalkableObject How?
9. CollidableObject FlyableObject FlyingEnemy FlyingActor How?
10. Pitfalls in IBA Deep and tangled hierarchies Diamond ring inheritance Copy-paste code here and there Special cases “Warning: don’t touch this!”
11. Component-based Architecture Each functionality is a game component Data-driven method for objects creation Design Patterns: “Favor composition over inheritance” Game Engine: Unity 3D
12. Player WalkableObject CollidableObject FlyableObject Enemy WalkableObject CollidableObject FlyableObject
13. WalkableObject CollidableObject FlyableObject Game Components
14. WalkingEnemy FlyingEnemy WalkableObject CollidableObject CollidableObject FlyableObject
15. Why Lua?
16. Advantages in Lua Lightweight, extensible, cross-platform Robust Freedom Simply love it Other programming languages?
17. Drawbacks in Lua Most editors don’t support auto-completion code Goodbye to debuggers & breakpoints Hello to loggers & print() No excuse for coffee break time
18. Don’t use CBA... yet CBA can’t save the (your) world OOD can do good things too Don’t make everything a component Leave messy code alone You might need an editor or tool
19. Pitfalls in Lua Naming convention for global variables Do garbage collection manually Don’t forget to compile scripts & strip debug info
20. My Lua Trilogy Lua 5.1.5 Luabind 0.9.1 Time-saver & OO-like Boost Luabind depends: template programming
21. My Programming Trilogy C++ Generic framework Objective-C iOS platform-specific OpenGL ES implementation Lua Data description Game logic 10% 65% 25% C++ Lua Objectitve-C
22. Basic Architecture & Components
23. Player Transform BoundingBox Quad
24. Meet Powerful ‘Table’ Player = {} Player[“Transform”] Player[“Quad”] Player[“Transform”]:SetTranslate(50, 100) Player[“Quad”]:SetSize(120, 120)
26. Traditional OOP Game Objects Update #1 #2 #3 #4 #5 Game Objects Render #1 #2 #3 #4 #5
27. Component-Based Architecture Game Components Update #1 #2 #3 #4 #5 Game Components Render #1 #2 #3 #4 #5
30. Game Object = Container Game Object Transform Bounding Sprite Motion StateMachine Timer
31. Object Factory Game Component Templates Game Object Templates Game-based
33. Interpolator GC 0 255 0.1 1.0 SetAlpha() SetScale()
34. Memory Management Lua Game Object Transform Sprite
35. Memory Management C++ Transform Sprite ...... Lua Game Object Transform Sprite
36. User Interfaces & Widgets Widgets Button Picture Text Number Radio Button Progress Bar
37. Widgets Functionalities Widgets Button Render/Update Movement Scale Up/Down Fade In/Out
38. Widgets = Container Widgets Button Sprite Motion Transform Fade
39. MainMenu Button Sprite Interpolator Input Events
40. Live Demo
41. [Launching Xcode]
42. Live Game Apps?
43. 《Bonnie’s Brunch 2》
44. 《Jade Ninja》 Jan. 2013 Coming Soon
45. If you are into Lua... Step 1) Data description/serialization Step 2) User interface Step 3) Game logic Warning: Don’t use Lua for everything
46. Live Well, Happy Coding, Make Great Games!