First pass scriptable subsystems that has the same lifetime of the engine

Author: WiggleWizard

Nuake/Engine.cpp

@@ -20,6 +20,8 @@
 #include <imgui/imgui_impl_opengl3.h>
 #include <Tracy.hpp>
 
+#include "src/Subsystems/EngineSubsystemScript.h"
+#include "src/Subsystems/TickableEngineSubsystem.h"
 
 
 namespace Nuake
@@ -39,6 +41,8 @@ namespace Nuake
 
 	void Engine::Init()
 	{
+		ScriptingEngineNet::Get().AddListener<ScriptingEngineNet::GameAssemblyLoadedDelegate>(&Engine::OnScriptingEngineGameAssemblyLoaded);
+		
 		AudioManager::Get().Initialize();
 		PhysicsManager::Get().Init();
 		NavManager::Get().Initialize();
@@ -53,6 +57,8 @@ namespace Nuake
 		RegisterCoreTypes::RegisterCoreComponents();
 
 		Modules::StartupModules();
+
+		InitializeCoreSubsystems();
 	}
 
 	void Engine::Tick()
@@ -92,6 +98,15 @@ namespace Nuake
 			}
 		}
 
+		// Tick all subsystems
+		for (auto subsystem : tickableSubsystems)
+		{
+			if (subsystem != nullptr)
+			{
+				subsystem->Tick();
+			}
+		}
+
 		// Dont update if no scene is loaded.
 		if (currentWindow->GetScene())
 		{
@@ -216,6 +231,46 @@ namespace Nuake
 		return currentProject;
 	}
 
+	Ref<EngineSubsystemScript> Engine::GetScriptedSubsystem(const std::string& subsystemName)
+	{
+		if (scriptedSubsystemMap.contains(subsystemName))
+		{
+			return scriptedSubsystemMap[subsystemName];
+		}
+		return nullptr;
+	}
+
+	void Engine::InitializeCoreSubsystems()
+	{
+	}
+
+	void Engine::OnScriptingEngineGameAssemblyLoaded()
+	{
+		subsystems.clear();
+		scriptedSubsystemMap.clear();
+		
+		auto& gameAssembly = ScriptingEngineNet::Get().GetGameAssembly();
+
+		auto scriptTypeEngineSubsystem = gameAssembly.GetType("Nuake.Net.EngineSubsystem");
+		
+		const auto& types = gameAssembly.GetTypes();
+		for (const auto& type : types)
+		{
+			// Initialize all subsystems
+			if (type->IsSubclassOf(scriptTypeEngineSubsystem))
+			{
+				const std::string typeName = std::string(type->GetFullName());
+				Logger::Log("Creating Scripted Subsystem " + typeName);
+
+				Coral::ManagedObject scriptedSubsystem = type->CreateInstance();
+				Ref<EngineSubsystemScript> subsystemScript = CreateRef<EngineSubsystemScript>(scriptedSubsystem);
+				subsystems.push_back(subsystemScript);
+
+				scriptedSubsystemMap[typeName] = subsystemScript;
+			}
+		}
+	}
+
 	bool Engine::LoadProject(Ref<Project> project)
 	{
 		currentProject = project;
@@ -236,4 +291,4 @@ namespace Nuake
 	{
 		return currentWindow;
 	}
-}
+}

Nuake/Engine.h

@@ -1,4 +1,5 @@
 #pragma once
+
 #include "src/Core/Core.h"
 #include "src/Core/Logger.h"
 #include "src/Window.h"
@@ -8,6 +9,9 @@ namespace Nuake
 {
 	class Project;
 	class Scene;
+	class EngineSubsystem;
+	class TickableEngineSubsystem;
+	class EngineSubsystemScript;
 
 	enum GameState
 	{
@@ -50,12 +54,23 @@ namespace Nuake
 		static bool LoadProject(Ref<Project> project);
 		static Ref<Project> GetProject();
 
+		static Ref<EngineSubsystemScript> GetScriptedSubsystem(const std::string& subsystemName);
+
+	protected:
+		static void InitializeCoreSubsystems();
+		static void OnScriptingEngineGameAssemblyLoaded();
+
 	private:
 		static Ref<Window> currentWindow;
 		static Ref<Project> currentProject;
 		static Ref<Scene> currentScene;
 		static std::string queuedScene;
 
+		static inline std::vector<Ref<EngineSubsystem>> subsystems;
+		static inline std::vector<Ref<TickableEngineSubsystem>> tickableSubsystems;
+
+		static inline std::unordered_map<std::string, Ref<EngineSubsystemScript>> scriptedSubsystemMap;
+
 		static GameState gameState;
 
 		static float lastFrameTime;

Nuake/src/Scripting/NetModules/EngineNetAPI.cpp

@@ -1,10 +1,15 @@
 #include "EngineNetAPI.h"
-#include <Coral/String.hpp>
-#include <src/Core/Maths.h>
-#include <Engine.h>
+
+#include "src/Core/Maths.h"
 #include "src/Rendering/SceneRenderer.h"
+#include "Engine.h"
+#include "src/Physics/PhysicsManager.h"
+
+#include <Coral/String.hpp>
+#include <Coral/ManagedObject.hpp>
 #include <Coral/Array.hpp>
-#include <src/Physics/PhysicsManager.h>
+#include "Coral/Type.hpp"
+#include "src/Subsystems/EngineSubsystemScript.h"
 
 namespace Nuake {
 
@@ -112,10 +117,22 @@ namespace Nuake {
 		Engine::QueueSceneSwitch(std::string(path));
 	}
 
+	Coral::ManagedObject GetEngineSubsystemByName(Coral::String subsystemName)
+	{
+		const Ref<EngineSubsystemScript> scriptedSubsystem = Engine::GetScriptedSubsystem(subsystemName);
+		if (scriptedSubsystem == nullptr)
+		{
+			return {};
+		}
+		
+		return scriptedSubsystem->GetManagedObjectInstance();
+	}
+
 	void EngineNetAPI::RegisterMethods()
 	{
 		RegisterMethod("Engine.LoadSceneIcall", &LoadScene);
 		RegisterMethod("Engine.LoggerLogIcall", (void*)(&Log));
+		RegisterMethod("Engine.GetSubsystemByNameIcall", &GetEngineSubsystemByName);
 
 		// Debug renderer
 		RegisterMethod("Debug.DrawLineIcall", &DrawLine);

Nuake/src/Scripting/ScriptingEngineNet.cpp

@@ -324,6 +324,15 @@ namespace Nuake
 		return widgetUUIDToManagedObjects[std::make_pair(canvasUUID, uuid)];
 	}
 
+	template<class T>
+	void ScriptingEngineNet::AddListener(const T& delegate)	{}
+
+	template <>
+	void ScriptingEngineNet::AddListener<ScriptingEngineNet::GameAssemblyLoadedDelegate>(const GameAssemblyLoadedDelegate& delegate)
+	{
+		listenersGameAssemblyLoaded.push_back(delegate);
+	}
+
 	std::vector<CompilationError> ScriptingEngineNet::BuildProjectAssembly(Ref<Project> project)
 	{
 		const std::string sanitizedProjectName = String::Sanitize(project->Name);
@@ -525,6 +534,11 @@ namespace Nuake
 					}
 				}
 			}
+
+			for (auto& delegate : listenersGameAssemblyLoaded)
+			{
+				delegate();
+			}
 		}
 	}
 

Nuake/src/Scripting/ScriptingEngineNet.h

@@ -73,6 +73,9 @@ namespace Nuake
 
 	class ScriptingEngineNet
 	{
+	public:
+		using GameAssemblyLoadedDelegate = std::function<void()>; 
+		
 	public:
 		static ScriptingEngineNet& Get();
 
@@ -83,6 +86,7 @@ namespace Nuake
 		Coral::HostInstance* GetHostInstance() { return hostInstance; }
 		Coral::AssemblyLoadContext& GetLoadContext() { return loadContext; }
 		Coral::ManagedAssembly GetNuakeAssembly() const { return nuakeAssembly; }
+		Coral::ManagedAssembly& GetGameAssembly() { return gameAssembly; }
 
 		Coral::ManagedAssembly ReloadEngineAPI(Coral::AssemblyLoadContext & context);
 
@@ -110,6 +114,9 @@ namespace Nuake
 		std::unordered_map<std::string, NetGameScriptObject> GetPointEntities() const { return pointEntityTypes; }
 		std::unordered_map<std::string, UIWidgetObject> GetUIWidgets() const { return uiWidgets; }
 
+		template<class T> void AddListener(const T& delegate);
+		template<> void AddListener(const GameAssemblyLoadedDelegate& delegate);
+
 	private:
 		const std::string m_Scope = "Nuake.Net";
 		const std::string m_EngineAssemblyName = "NuakeNet.dll";
@@ -140,6 +147,8 @@ namespace Nuake
 
 		std::unordered_map<uint32_t, Coral::ManagedObject> entityToManagedObjects;
 		std::map<std::pair<UUID, UUID>, Coral::ManagedObject> widgetUUIDToManagedObjects;
+
+		std::vector<GameAssemblyLoadedDelegate> listenersGameAssemblyLoaded;
 
 		ScriptingEngineNet();
 		~ScriptingEngineNet();
@@ -148,4 +157,4 @@ namespace Nuake
 		std::string GenerateGUID();
 		std::vector<CompilationError> ExtractErrors(const std::string& input);
 	};
-}
+}

Nuake/src/Subsystems/EngineSubsystem.cpp

@@ -0,0 +1 @@
+#include "EngineSubsystem.h"

Nuake/src/Subsystems/EngineSubsystem.h

@@ -0,0 +1,14 @@
+#pragma once
+
+/**
+ * Specific type of subsystem that runs within the context of the engine, being created at the start of the
+ * engine's lifetime and destroyed just before the engine shuts down.
+ */
+namespace Nuake
+{
+    class EngineSubsystem
+    {
+    public:
+
+    };
+}

Nuake/src/Subsystems/EngineSubsystemScript.cpp

@@ -0,0 +1,18 @@
+#include "EngineSubsystemScript.h"
+
+namespace Nuake
+{
+ 
+EngineSubsystemScript::EngineSubsystemScript(const Coral::ManagedObject& object)
+    : cSharpObjectInstance(object)
+{
+
+}
+
+Coral::ManagedObject& EngineSubsystemScript::GetManagedObjectInstance()
+{
+    return cSharpObjectInstance;
+}
+}
+
+

Nuake/src/Subsystems/EngineSubsystemScript.h

@@ -0,0 +1,21 @@
+#pragma once
+
+#include "EngineSubsystem.h"
+#include "Coral/ManagedObject.hpp"
+
+/**
+ * Essentially just a wrapper for C# subsystems
+ */
+namespace Nuake
+{
+    class EngineSubsystemScript : public EngineSubsystem
+    {
+    public:
+        EngineSubsystemScript(const Coral::ManagedObject& object);
+
+        Coral::ManagedObject& GetManagedObjectInstance();
+
+    private:
+        Coral::ManagedObject cSharpObjectInstance;
+    };
+}

Nuake/src/Subsystems/SceneSubsystem.cpp

@@ -0,0 +1 @@
+#include "SceneSubsystem.h"