From e82f70ba0291c5bcbe6307d6150281d0751fe241 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Simon=20L=C3=BCbe=C3=9F?= <simon.luebess@gmail.com>
Date: Thu, 3 Mar 2022 01:39:04 +0100
Subject: [PATCH] Native scripting

---
 GlitchyEditor/src/EditorLayer.bf            | 39 +++++++++++++++++++++
 GlitchyEngine/src/World/Components.bf       | 30 +++++++++++++++-
 GlitchyEngine/src/World/Entity.bf           |  1 -
 GlitchyEngine/src/World/Scene.bf            | 14 ++++++++
 GlitchyEngine/src/World/ScriptableEntity.bf | 31 ++++++++++++++++
 5 files changed, 113 insertions(+), 2 deletions(-)
 create mode 100644 GlitchyEngine/src/World/ScriptableEntity.bf

diff --git a/GlitchyEditor/src/EditorLayer.bf b/GlitchyEditor/src/EditorLayer.bf
index f3da79a..2063c94 100644
--- a/GlitchyEditor/src/EditorLayer.bf
+++ b/GlitchyEditor/src/EditorLayer.bf
@@ -31,6 +31,41 @@ namespace GlitchyEditor
 		Entity _cameraEntity;
 		Entity _otherCameraEntity;
 
+		class CameraController : ScriptableEntity
+		{
+			protected override void OnCreate()
+			{
+				Log.EngineLogger.Trace("Cam controller created!");
+			}
+
+			protected override void OnUpdate(GameTime gameTime)
+			{
+				var transformCmp = GetComponent<SimpleTransformComponent>();
+
+				if (Input.IsKeyPressed(Key.A))
+				{
+					transformCmp.Transform.Translation.X -= gameTime.DeltaTime;
+				}
+				if (Input.IsKeyPressed(Key.D))
+				{
+					transformCmp.Transform.Translation.X += gameTime.DeltaTime;
+				}
+				if (Input.IsKeyPressed(Key.W))
+				{
+					transformCmp.Transform.Translation.Y += gameTime.DeltaTime;
+				}
+				if (Input.IsKeyPressed(Key.S))
+				{
+					transformCmp.Transform.Translation.Y -= gameTime.DeltaTime;
+				}
+			}
+
+			protected override void OnDestroy()
+			{
+				Log.EngineLogger.Trace("Cam controller destroyed!");
+			}
+		}
+
 		public this() : base("Example")
 		{
 			Application.Get().Window.IsVSync = false;
@@ -47,6 +82,8 @@ namespace GlitchyEditor
 				camera.FixedAspectRatio = false;
 				let transform = _cameraEntity.GetComponent<SimpleTransformComponent>();
 				transform.Transform = Matrix.Translation(0, 0, -5);
+
+				_cameraEntity.AddComponent<NativeScriptComponent>().Bind<CameraController>();
 			}
 
 			{
@@ -57,6 +94,8 @@ namespace GlitchyEditor
 				camera.FixedAspectRatio = false;
 				let transform = _otherCameraEntity.GetComponent<SimpleTransformComponent>();
 				transform.Transform = Matrix.Translation(0, 0, -5);
+
+				_otherCameraEntity.AddComponent<NativeScriptComponent>().Bind<CameraController>();
 			}
 		}
 
diff --git a/GlitchyEngine/src/World/Components.bf b/GlitchyEngine/src/World/Components.bf
index 9cdf424..04f6751 100644
--- a/GlitchyEngine/src/World/Components.bf
+++ b/GlitchyEngine/src/World/Components.bf
@@ -115,7 +115,7 @@ namespace GlitchyEngine.World
 	struct CameraComponent
 	{
 		public SceneCamera Camera;
-		public bool Primary = true; // Todo: probably move into scene
+		public bool Primary = true;  // Todo: probably move into scene
 		public bool FixedAspectRatio = false;
 
 		public this()
@@ -123,4 +123,32 @@ namespace GlitchyEngine.World
 			Camera = .();
 		}	
 	}
+
+	struct NativeScriptComponent : IDisposableComponent
+	{
+		public ScriptableEntity Instance = null;
+		
+		public function void (mut NativeScriptComponent this) Func;
+
+		public function ScriptableEntity () InstantiateFunction;
+		public function void (NativeScriptComponent* self) DestroyInstanceFunction;
+
+		public void Bind<T>() mut where T : ScriptableEntity
+		{
+			InstantiateFunction = () =>
+				{
+					return new T();
+				};
+
+			DestroyInstanceFunction = (self) =>
+				{
+					delete self.Instance;
+				};
+		}
+
+		public void Dispose() mut
+		{
+			DestroyInstanceFunction(&this);
+		}
+	}
 }
\ No newline at end of file
diff --git a/GlitchyEngine/src/World/Entity.bf b/GlitchyEngine/src/World/Entity.bf
index 227a40c..962838c 100644
--- a/GlitchyEngine/src/World/Entity.bf
+++ b/GlitchyEngine/src/World/Entity.bf
@@ -51,6 +51,5 @@ namespace GlitchyEngine.World
 
 			_scene._ecsWorld.RemoveComponent<T>(_entity);
 		}
-
 	}
 }
diff --git a/GlitchyEngine/src/World/Scene.bf b/GlitchyEngine/src/World/Scene.bf
index 2a4d641..5beb249 100644
--- a/GlitchyEngine/src/World/Scene.bf
+++ b/GlitchyEngine/src/World/Scene.bf
@@ -4,6 +4,8 @@ using System;
 
 namespace GlitchyEngine.World
 {
+	using internal ScriptableEntity;
+
 	class Scene
 	{
 		internal EcsWorld _ecsWorld = new .() ~ delete _;
@@ -22,6 +24,18 @@ namespace GlitchyEngine.World
 		{
 			//TransformSystem.Update(_ecsWorld);
 
+			for (var (entity, script) in _ecsWorld.Enumerate<NativeScriptComponent>())
+			{
+				if (script.Instance == null)
+				{
+					script.Instance = script.InstantiateFunction();
+					script.Instance._entity = Entity(entity, this);
+					script.Instance.[Friend]OnCreate();
+				}
+
+				script.Instance.[Friend]OnUpdate(gameTime);
+			}
+
 			Camera* primaryCamera = null;
 			Matrix* primaryCameraTransform = null;
 
diff --git a/GlitchyEngine/src/World/ScriptableEntity.bf b/GlitchyEngine/src/World/ScriptableEntity.bf
new file mode 100644
index 0000000..bb57ab9
--- /dev/null
+++ b/GlitchyEngine/src/World/ScriptableEntity.bf
@@ -0,0 +1,31 @@
+namespace GlitchyEngine.World
+{
+	class ScriptableEntity
+	{
+		internal Entity _entity;
+
+		public T* AddComponent<T>(T value = T()) where T: struct, new
+		{
+			return _entity.AddComponent<T>(value);
+		}
+
+		public T* GetComponent<T>() where T: struct, new
+		{
+			return _entity.GetComponent<T>();
+		}
+
+		public bool HasComponent<T>() where T: struct, new
+		{
+			return _entity.HasComponent<T>();
+		}
+
+		public void RemoveComponent<T>() where T: struct, new
+		{
+			_entity.RemoveComponent<T>();
+		}
+
+		protected virtual void OnCreate() {}
+		protected virtual void OnDestroy() {}
+		protected virtual void OnUpdate(GameTime gt) {}
+	}
+}
\ No newline at end of file