Add TouchScreen Manager (#2333)

Ryujinx.Input/IMouse.cs

@@ -0,0 +1,100 @@
+using System.Drawing;
+using System.Numerics;
+
+namespace Ryujinx.Input
+{
+    /// <summary>
+    /// Represent an emulated mouse.
+    /// </summary>
+    public interface IMouse : IGamepad
+    {
+        private const int SwitchPanelWidth = 1280;
+        private const int SwitchPanelHeight = 720;
+
+        /// <summary>
+        /// Check if a given button is pressed on the mouse.
+        /// </summary>
+        /// <param name="button">The button</param>
+        /// <returns>True if the given button is pressed on the mouse</returns>
+        bool IsButtonPressed(MouseButton button);
+
+        /// <summary>
+        /// Get the position of the mouse in the client.
+        /// </summary>
+        Vector2 GetPosition();
+
+        /// <summary>
+        /// Get the client size.
+        /// </summary>
+        Size ClientSize { get; }
+
+        /// <summary>
+        /// Get the button states of the mouse.
+        /// </summary>
+        bool[] Buttons { get; }
+
+        /// <summary>
+        /// Get a snaphost of the state of a mouse.
+        /// </summary>
+        /// <param name="mouse">The mouse to do a snapshot of</param>
+        /// <returns>A snaphost of the state of the mouse.</returns>
+        public static MouseStateSnapshot GetMouseStateSnapshot(IMouse mouse)
+        {
+            var position = mouse.GetPosition();
+            bool[] buttons = new bool[(int)MouseButton.Count];
+
+            mouse.Buttons.CopyTo(buttons, 0);
+
+            return new MouseStateSnapshot(buttons, position);
+        }
+
+        /// <summary>
+        /// Get the touch position of a mouse position relative to the app's view
+        /// </summary>
+        /// <param name="mousePosition">The position of the mouse in the client</param>
+        /// <param name="clientSize">The size of the client</param>
+        /// <param name="aspectRatio">The aspect ratio of the view</param>
+        /// <returns>A snaphost of the state of the mouse.</returns>
+        public static Vector2 GetTouchPosition(Vector2 mousePosition, Size clientSize, float aspectRatio)
+        {
+            float mouseX = mousePosition.X;
+            float mouseY = mousePosition.Y;
+
+            float aspectWidth = SwitchPanelHeight * aspectRatio;
+
+            int screenWidth = clientSize.Width;
+            int screenHeight = clientSize.Height;
+
+            if (clientSize.Width > clientSize.Height * aspectWidth / SwitchPanelHeight)
+            {
+                screenWidth = (int)(clientSize.Height * aspectWidth) / SwitchPanelHeight;
+            }
+            else
+            {
+                screenHeight = (clientSize.Width * SwitchPanelHeight) / (int)aspectWidth;
+            }
+
+            int startX = (clientSize.Width - screenWidth) >> 1;
+            int startY = (clientSize.Height - screenHeight) >> 1;
+
+            int endX = startX + screenWidth;
+            int endY = startY + screenHeight;
+
+            if (mouseX >= startX &&
+                mouseY >= startY &&
+                mouseX < endX &&
+                mouseY < endY)
+            {
+                int screenMouseX = (int)mouseX - startX;
+                int screenMouseY = (int)mouseY - startY;
+
+                mouseX = (screenMouseX * (int)aspectWidth) / screenWidth;
+                mouseY = (screenMouseY * SwitchPanelHeight) / screenHeight;
+
+                return new Vector2(mouseX, mouseY);
+            }
+
+            return new Vector2();
+        }
+    }
+}