Add project files.

Assets/Cryville/Common/Unity/Input/UnityMouseHandler.cs

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+using System;
+using UnityEngine;
+using unity = UnityEngine;
+
+namespace Cryville.Common.Unity.Input {
+	public class UnityMouseHandler : InputHandler {
+		GameObject receiver;
+
+		public UnityMouseHandler() {
+			if (!unity::Input.mousePresent) {
+				throw new NotSupportedException("Unity mouse is not supported on this device");
+			}
+		}
+
+		public override void Activate() {
+			receiver = new GameObject("__mouserecv__");
+			receiver.AddComponent<UnityMouseReceiver>().SetHandler(this);
+		}
+
+		public override void Deactivate() {
+			if (receiver) GameObject.Destroy(receiver);
+		}
+
+		public override void Dispose(bool disposing) {
+			if (disposing) {
+				Deactivate();
+			}
+		}
+
+		public override bool IsNullable(int type) {
+			if (type != 0) throw new ArgumentOutOfRangeException(nameof(type));
+			return false;
+		}
+
+		public override byte GetDimension(int type) {
+			if (type != 0) throw new ArgumentOutOfRangeException(nameof(type));
+			return 2;
+		}
+
+		public override string GetTypeName(int type) {
+			switch (type) {
+				case 0: return "Unity Mouse";
+				default: throw new ArgumentOutOfRangeException(nameof(type));
+			}
+		}
+
+		public override double GetCurrentTimestamp() {
+			return Time.timeAsDouble;
+		}
+
+		public class UnityMouseReceiver : MonoBehaviour {
+			UnityMouseHandler handler;
+			public void SetHandler(UnityMouseHandler h) {
+				handler = h;
+			}
+			void Update() {
+				double time = Time.timeAsDouble;
+				Vector2 pos = unity::Input.mousePosition;
+				pos.y = Screen.height - pos.y;
+				handler.OnInput(0, 0, new InputVector(time, pos));
+			}
+		}
+	}
+}