Roberto De Ioris - Scriptiamo Unreal Engine con Lua - Codemotion Rome 2019
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Il plugin open-source LuaMachine permette di includere una o piu' macchine virtuali Lua all'interno dei progetti Unreal Engine. A differenza di altre implementazioni, il suo scopo principale e' fornire ai programmatori un modo rapido di esporre api (sia via Blueprint che C++) al motore di scripting per fornire ai game designer un ambiente 'protetto' in cui lavorare. Il talk illustrera' le principali caratteristiche del plugin, il suo ciclo di sviluppo e diversi casi d'uso.
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Roberto De Ioris - Scriptiamo Unreal Engine con Lua - Codemotion Rome 2019
- 1. Scripting (and modding) Unreal Engine with Lua Roberto De Ioris https://github.com/rdeioris https://github.com/unbit @unbit Codemotion Rome 2019
- 3. What do they have in common ? ∙ Game Designers ∙ Animators ∙ Riggers ∙ Data Analysts
- 4. "Teach a man to use a game engine and he'll ship a game, teach a man to build a game engine and he'll never ship anything"
- 5. Programming and Scripting in Unreal Engine 4 ∙ C++ ∙ Blueprints ∙ Various Plugins (Python, Javascript, Lua, …)
- 6. Why “classic” Scripting Instead of Blueprints ∙ Scaling ∙ Expressivene ss
- 7. Why Lua ? ∙ Embarrassingly easy (very few rules) ∙ Tiny ∙ Fast ∙ Embeddable (without pain) ∙ Multiple VMs in the same process ∙ Solid ∙ Big Community ∙ Lot of third party libraries ∙ …
- 8. Caveats when embedding scripting languages ∙ Memory management (!!!) ∙ Language Idiomaticity ∙ Data Representation ∙ Performance
- 9. The Unreal Engine 4 API OO P OO P OO P OO P OO P OO P OO P OO P OO P OO P OO P OO P OO P OO P OO P OO P OO P
- 11. Building a tool for Game Designers ∙ Low learning curve ∙ Built on top of the designers needs, not the engine ones ∙ “Safe” ∙ Debuggable
- 12. Building a tool for Modders ∙ Low learning curve ∙ Built on top of the modders needs, not the engine ones ∙ “Safe” ∙ Debuggable
- 14. Supported Platforms ∙ Windows 64bit (Editor + Runtime) ∙ Mac (Editor + Runtime) ∙ Linux 64bit (Editor + Runtime) ∙ Android (Runtime) ∙ iOS (Runtime)
- 15. Hello World
- 26. Working with LuaValues (C++)UCLASS() class LUATEST422_API UCodemotionCppLuaState : public ULuaState { GENERATED_BODY() UFUNCTION() FLuaValue DummyAdder(TArray<FLuaValue> Args); }; FLuaValue UCodemotionCppLuaState::DummyAdder(TArray<FLuaValue> Args) { int32 Total = 0; for (FLuaValue& Arg : Args) { Total += Arg.ToInteger(); } return FLuaValue(Total); }
- 29. Running Lua Scripts from URLs∙ Think twice ∙ Think twice ∙ Think twice
- 30. Running Lua Scripts from URLs [take two]∙ RSA signing ∙ https
- 32. Widget s ∙ Code Editor with syntax colouring ∙ ANSI Output (WIP)
- 34. Error Management
- 35. Monitoring and Managing ∙ Memory usage ∙ Stack top ∙ GC
- 36. Debuggin g ∙ Simple GUI (WIP) ∙ Events ∙ via Lua-itself
- 38. Debug Hooks
- 39. Debug Hooks (C++) void UCodemotionCppLuaState::ReceiveLuaCallHook_Implementation(const FLuaDebug& LuaDebug) { UE_LOG(LogLuaMachine, Warning, TEXT("Name: %s"), *LuaDebug.Name); }
- 40. Coroutine s
- 46. Blueprint (and C++) Functional Tests included
- 48. Hidden Features ∙ Reflection API ∙ Lua States as Singletons/Managers (with Events) ∙ Syntax Highlighter (with custom keywords)
- 49. Note s ∙ You can call Lua functions from everywhere ∙ (animation blueprints, behaviour trees, widgets,…) ∙ C++ UFUNCTIONs can be exposed easily ∙ You can easily convert C++ UPROPERTies to Lua tables
- 52. Special Thanks ∙ AIV ∙ Nicolas Martel (aka. Nogitsu) ∙ Epic