Add TouchScreen Manager (#2333)

Ryujinx.Input/HLE/TouchScreenManager.cs

@@ -0,0 +1,57 @@
+using Ryujinx.HLE;
+using Ryujinx.HLE.HOS.Services.Hid;
+using System;
+
+namespace Ryujinx.Input.HLE
+{
+    public class TouchScreenManager : IDisposable
+    {
+        private readonly IMouse _mouse;
+        private Switch _device;
+
+        public TouchScreenManager(IMouse mouse)
+        {
+            _mouse = mouse;
+        }
+
+        public void Initialize(Switch device)
+        {
+            _device = device;
+        }
+
+        public bool Update(bool isFocused, float aspectRatio = 0)
+        {
+            if (!isFocused)
+            {
+                _device.Hid.Touchscreen.Update();
+
+                return false;
+            }
+
+            if (aspectRatio > 0)
+            {
+                var snapshot = IMouse.GetMouseStateSnapshot(_mouse);
+                var touchPosition = IMouse.GetTouchPosition(snapshot.Position, _mouse.ClientSize, aspectRatio);
+
+                TouchPoint currentPoint = new TouchPoint
+                {
+                    X = (uint)touchPosition.X,
+                    Y = (uint)touchPosition.Y,
+
+                    // Placeholder values till more data is acquired
+                    DiameterX = 10,
+                    DiameterY = 10,
+                    Angle = 90
+                };
+
+                _device.Hid.Touchscreen.Update(currentPoint);
+
+                return true;
+            }
+
+            return false;
+        }
+
+        public void Dispose() { }
+    }
+}