Using Lua to Build a Component-based Architecture for Game Apps

Presented on COSCUP 2013 http://coscup.org/2013/en/

Transcript

1. Using Lua to Build a Component-based Architecture for Game Apps 半路 / Jheng Wei Ciao
2. Component Based Architecture
3. Lua
4. Pitfalls of Object-Oriented Design ?!
5. Traditional OOD Object-Oriented Design Class Inheritance Virtualization Polymorphism Inheritance-based Architecture
6. Player Enemy WalkableObject Actor CollidableObject
8. FlyableObject Player Enemy Actor WalkableObject CollidableObject
9. CollidableObject FlyableObject FlyingEnemy Actor WalkableObject How?
10. CollidableObject FlyableObject FlyingEnemy FlyingActor How?
11. Pitfalls of IBA Deep and tangled hierarchies Diamond ring inheritance Copy-paste code here and there Special cases Magic: don’t touch it
12. Component-based Architecture Each functionality is a game component Data-driven method for objects creation Design Patterns: “Favor composition over inheritance”
13. Player WalkableObject CollidableObject FlyableObject Enemy WalkableObject CollidableObject FlyableObject
14. WalkableObject CollidableObject FlyableObject Game Components
15. WalkingEnemy FlyingEnemy WalkableObject CollidableObject CollidableObject FlyableObject
16. Don’t use CBA... yet CBA can’t save 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
18. Who Are Using Lua
19. Advantages of Lua Lightweight Extensible Cross-platform Robust Openness Community
20. Drawbacks of Lua Most editors don’t support auto-completion code Goodbye to debuggers & breakpoints Hello to loggers & print() No excuse for coffee break time
21. Pitfalls of Lua Naming convention for global variables Do garbage collection manually Don’t forget to compile scripts & strip debug info
22. My Lua Trilogy Lua 5.1.5 Luabind 0.9.1 Time-saver & OO-like Boost Luabind depends: template programming
23. 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
24. Player Transform BoundingBox Quad
25. Meet Powerful ‘Table’ Player = {} Player[“Transform”] Player[“Quad”] Player[“Transform”]:SetTranslate(50, 100) Player[“Quad”]:SetSize(120, 120)
27. Traditional OOP Game Objects Update #1 #2 #3 #4 #5 Game Objects Render #1 #2 #3 #4 #5
28. Component-Based Architecture Game Components Update #1 #2 #3 #4 #5 Game Components Render #1 #2 #3 #4 #5
29. Game Object = Container Game Object Transform Bounding Sprite Motion StateMachine Timer
30. Object Factory Game Component Templates Game Object Templates Game-based
31. Interpolator GC 0 255 0.1 1.0 SetAlpha() SetScale()
32. Memory Management C++ Transform Sprite ...... Lua Game Object Transform Sprite
33. User Interfaces & Widgets Widgets Button Picture Text Number Radio Button Progress Bar
34. Widgets = Container Widgets Button Render/Update Movement Scale Up/Down Fade In/Out Sprite Motion Transform Fade
35. MainMenu Button Sprite Interpolator Input Events
36. Lua + CBA = 100% Awesome!
37. [Launching Xcode] Live Demo
38. Live Game Apps?
39. Lua for Game Apps
40. CBA for Game Apps
41. Lua + CBA ......?
42. We’re recruiting one Android engineer
43. Open Mind, Happy Coding, Make Great Games!