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

Transcript

1. 1.

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

   半路 / Jheng Wei Ciao
2. 2.

   Component Based Architecture

3. 3.

   Lua

4. 4.

   Pitfalls of Object-Oriented Design ?!

5. 5.

   Traditional OOD Object-Oriented Design Class Inheritance Virtualization Polymorphism Inheritance-based Architecture

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   Player Enemy WalkableObject Actor CollidableObject

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   None
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   FlyableObject Player Enemy Actor WalkableObject CollidableObject

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   CollidableObject FlyableObject FlyingEnemy Actor WalkableObject How?

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    CollidableObject FlyableObject FlyingEnemy FlyingActor How?

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    Pitfalls of IBA Deep and tangled hierarchies Diamond ring inheritance

    Copy-paste code here and there Special cases Magic: don’t touch it
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    Component-based Architecture Each functionality is a game component Data-driven method

    for objects creation Design Patterns: “Favor composition over inheritance”
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    Player WalkableObject CollidableObject FlyableObject Enemy WalkableObject CollidableObject FlyableObject

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    WalkableObject CollidableObject FlyableObject Game Components

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    WalkingEnemy FlyingEnemy WalkableObject CollidableObject CollidableObject FlyableObject

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    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
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    None
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    Who Are Using Lua

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    Advantages of Lua Lightweight Extensible Cross-platform Robust Openness Community

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    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
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    Pitfalls of Lua Naming convention for global variables Do garbage

    collection manually Don’t forget to compile scripts & strip debug info
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    My Lua Trilogy Lua 5.1.5 Luabind 0.9.1 Time-saver & OO-like

    Boost Luabind depends: template programming
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    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
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    Player Transform BoundingBox Quad

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    Meet Powerful ‘Table’ Player = {} Player[“Transform”] Player[“Quad”] Player[“Transform”]:SetTranslate(50, 100)

    Player[“Quad”]:SetSize(120, 120)
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    None
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    Traditional OOP Game Objects Update #1 #2 #3 #4 #5

    Game Objects Render #1 #2 #3 #4 #5
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    Component-Based Architecture Game Components Update #1 #2 #3 #4 #5

    Game Components Render #1 #2 #3 #4 #5
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    Game Object = Container Game Object Transform Bounding Sprite Motion

    StateMachine Timer
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    Object Factory Game Component Templates Game Object Templates Game-based

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    Interpolator GC 0 255 0.1 1.0 SetAlpha() SetScale()

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    Memory Management C++ Transform Sprite ...... Lua Game Object Transform

    Sprite
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    User Interfaces & Widgets Widgets Button Picture Text Number Radio

    Button Progress Bar
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    Widgets = Container Widgets Button Render/Update Movement Scale Up/Down Fade

    In/Out Sprite Motion Transform Fade
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    MainMenu Button Sprite Interpolator Input Events

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    Lua + CBA = 100% Awesome!

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    [Launching Xcode] Live Demo

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    Live Game Apps?

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    Lua for Game Apps

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    CBA for Game Apps

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    Lua + CBA ......?

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    We’re recruiting one Android engineer

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    Open Mind, Happy Coding, Make Great Games!