arcball transform system for camera

FNA

@@ -1 +1 @@
-Subproject commit 9a8a84c3d427f47759a92342aaa8f7f08e751a64
+Subproject commit c665d2e08c25fb63e58e987b7c1af75af22aa010

Kav

@@ -1 +1 @@
-Subproject commit d156fbc39a771ac990cbb809b82ba771464785a5
+Subproject commit 55b1555df2ded543e623c8b5eb60d3a3fff9e32c

KavTest/Components/ArcballTransformComponent.cs

@@ -0,0 +1,14 @@
+using Encompass;
+
+namespace KavTest
+{
+    public struct ArcballTransformComponent : IComponent
+    {
+        public ArcballTransform ArcballTransform { get; }
+
+        public ArcballTransformComponent(ArcballTransform arcballTransform)
+        {
+            ArcballTransform = arcballTransform;
+        }
+    }
+}

KavTest/Engines/CameraEngine.cs

@@ -4,9 +4,9 @@ using KavTest.Messages;
 
 namespace KavTest.Engines
 {
-    [Reads(typeof(CameraComponent))]
+    [Reads(typeof(CameraComponent), typeof(ArcballTransformComponent))]
-    [Receives(typeof(MoveCameraMessage))]
+    [Receives(typeof(MoveCameraMessage), typeof(RotateCameraMessage))]
-    [Sends(typeof(LocalTranslationMessage))]
+    [Writes(typeof(ArcballTransformComponent))]
     public class CameraEngine : Engine
     {
         public override void Update(double dt)
@@ -14,11 +14,21 @@ namespace KavTest.Engines
             if (SomeComponent<CameraComponent>())
             {
                 var cameraEntity = ReadEntity<CameraComponent>();
+                var arcballTransformComponent = GetComponent<ArcballTransformComponent>(cameraEntity);
+
+                var transform = arcballTransformComponent.ArcballTransform;
 
                 foreach (var moveMessage in ReadMessages<MoveCameraMessage>())
                 {
-                    SendMessage(new LocalTranslationMessage(cameraEntity, moveMessage.Translation * (float)dt));
+                    transform = transform.TranslateLocal(moveMessage.Translation * (float)dt);
                 }
+
+                foreach (var rotateMessage in ReadMessages<RotateCameraMessage>())
+                {
+                    transform = transform.RotateLocal(-rotateMessage.Yaw * 0.25f * (float)dt, rotateMessage.Pitch * 0.25f * (float)dt);
+                }
+
+                SetComponent(cameraEntity, new ArcballTransformComponent(transform));
             }
         }
     }

KavTest/Engines/InputEngine.cs

@@ -1,16 +1,35 @@
 using Encompass;
+using KavTest.Components;
 using KavTest.Messages;
 using Microsoft.Xna.Framework;
 using Microsoft.Xna.Framework.Input;
 
 namespace KavTest.Engines
 {
-    [Sends(typeof(MoveCameraMessage))]
+    [Reads(typeof(CameraComponent))]
+    [Sends(
+        typeof(MoveCameraMessage),
+        typeof(RotateCameraMessage)
+    )]
     public class InputEngine : Engine
     {
+        private int centerX;
+        private int centerY;
+
+        public InputEngine(int centerX, int centerY)
+        {
+            System.Console.WriteLine(centerX);
+            System.Console.WriteLine(centerY);
+            this.centerX = centerX;
+            this.centerY = centerY;
+            Mouse.SetPosition(centerX, centerY);
+            System.Console.WriteLine(Mouse.GetState().X);
+        }
+
         public override void Update(double dt)
         {
             var keyboardState = Keyboard.GetState();
+            var mouseState = Mouse.GetState();
 
             if (keyboardState.IsKeyDown(Keys.W))
             {
@@ -31,6 +50,15 @@ namespace KavTest.Engines
             {
                 SendMessage(new MoveCameraMessage(new Vector3(5, 0, 0)));
             }
+
+            var mouseMovement = new Vector2(centerX - mouseState.X, centerY - mouseState.Y);
+            Mouse.SetPosition(centerX, centerY);
+
+            if (SomeComponent<CameraComponent>())
+            {
+                var cameraEntity = ReadEntity<CameraComponent>();
+                SendMessage(new RotateCameraMessage(cameraEntity, mouseMovement.X, mouseMovement.Y));
+            }
         }
     }
 }

KavTest/KavTestGame.cs

@@ -36,7 +36,7 @@ namespace KavTest
                 Smuggler.Importer.ImportGLB(GraphicsDevice, File.OpenRead("Content/rustysphere.glb"))
             );
 
-            WorldBuilder.AddEngine(new InputEngine());
+            WorldBuilder.AddEngine(new InputEngine(GraphicsDevice.Viewport.Width / 2, GraphicsDevice.Viewport.Height / 2));
             WorldBuilder.AddEngine(new AngularVelocityEngine());
             WorldBuilder.AddEngine(new MotionEngine());
             WorldBuilder.AddEngine(new CameraEngine());
@@ -65,15 +65,13 @@ namespace KavTest
                 300f
             ));
 
-            var cameraTransform = new Transform3D(
-                new Vector3(0, 0, -10),
-                Quaternion.CreateFromAxisAngle(Vector3.Up, MathHelper.Pi),
-                Vector3.One
-            );
-
             var cameraEntity = WorldBuilder.CreateEntity();
-            WorldBuilder.SetComponent(cameraEntity, new Transform3DComponent(
+            WorldBuilder.SetComponent(cameraEntity, new ArcballTransformComponent(
-                cameraTransform
+                new ArcballTransform(
+                    new Vector3(0, 0, -10),
+                    MathHelper.Pi,
+                    0
+                )
             ));
             WorldBuilder.SetComponent(cameraEntity, new CameraComponent(
                 Matrix.CreatePerspectiveFieldOfView(

KavTest/Messages/RotateCameraMessage.cs

@@ -0,0 +1,18 @@
+using Encompass;
+
+namespace KavTest
+{
+    public struct RotateCameraMessage : IMessage, IHasEntity
+    {
+        public Entity Entity { get; }
+        public float Yaw { get; }
+        public float Pitch { get; }
+
+        public RotateCameraMessage(Entity entity, float yaw, float pitch)
+        {
+            Entity = entity;
+            Yaw = yaw;
+            Pitch = pitch;
+        }
+    }
+}

KavTest/Renderers/SceneRenderer.cs

@@ -54,11 +54,11 @@ namespace KavTest.Renderers
             if (SomeComponent<CameraComponent>())
             {
                 var cameraEntity = ReadEntity<CameraComponent>();
-                var transformComponent = GetComponent<Transform3DComponent>(cameraEntity);
+                var transformComponent = GetComponent<ArcballTransformComponent>(cameraEntity);
                 var cameraComponent = GetComponent<CameraComponent>(cameraEntity);
 
                 var camera = new Kav.Camera(
-                    transformComponent.Transform.TransformMatrix,
+                    transformComponent.ArcballTransform.TransformMatrix,
                     cameraComponent.Projection
                 );
 

KavTest/Utility/ArcballTransform.cs

@@ -0,0 +1,51 @@
+using Microsoft.Xna.Framework;
+
+namespace KavTest
+{
+    public struct ArcballTransform
+    {
+        public Vector3 Position { get; }
+        public float Yaw { get; }
+        public float Pitch { get; }
+
+        private Matrix RotationMatrix { get; }
+        public Matrix TransformMatrix { get; }
+        public Vector3 Forward { get { return TransformMatrix.Forward; } }
+        public Vector3 Right { get { return TransformMatrix.Right; } }
+        public Vector3 Up { get { return TransformMatrix.Up; } }
+
+        public ArcballTransform(Vector3 position, float yaw, float pitch)
+        {
+            Position = position;
+            Yaw = yaw;
+            Pitch = pitch;
+            RotationMatrix = CreateRotationMatrix(Yaw, Pitch);
+            TransformMatrix = CreateTransformMatrix(Position, RotationMatrix);
+        }
+
+        public ArcballTransform RotateLocal(float deltaYaw, float deltaPitch)
+        {
+            return new ArcballTransform(Position, Yaw + deltaYaw, Pitch + deltaPitch);
+        }
+
+        public ArcballTransform TranslateLocal(Vector3 localTranslation)
+        {
+            var worldTranslation = Vector3.Transform(localTranslation, RotationMatrix);
+            return new ArcballTransform(Position + worldTranslation, Yaw, Pitch);
+        }
+
+        private static Matrix CreateRotationMatrix(float yaw, float pitch)
+        {
+            return
+                Matrix.CreateRotationX(pitch) *
+                Matrix.CreateRotationY(yaw);
+        }
+
+        private static Matrix CreateTransformMatrix(Vector3 position, Matrix rotation)
+        {
+            return
+                rotation *
+                Matrix.CreateTranslation(position);
+        }
+    }
+}

encompass-cs

@@ -1 +1 @@
-Subproject commit 0a30dab3c2a8ef4ce435af8123bcb64efe4926d8
+Subproject commit bdd9f595493609444d8ebb31b9d07b7ef320eafb