frontend: Add a SDL2 headless window (#2310)

Ryujinx.Headless.SDL2/SDL2MouseDriver.cs

@@ -0,0 +1,104 @@
+using Ryujinx.Common.Logging;
+using Ryujinx.Input;
+using System;
+using System.Diagnostics;
+using System.Drawing;
+using System.Numerics;
+using System.Runtime.CompilerServices;
+using static SDL2.SDL;
+
+namespace Ryujinx.Headless.SDL2
+{
+    class SDL2MouseDriver : IGamepadDriver
+    {
+        private bool _isDisposed;
+
+        public bool[] PressedButtons { get; }
+
+        public Vector2 CurrentPosition { get; private set; }
+        public Vector2 Scroll { get; private set; }
+        public Size _clientSize;
+
+        public SDL2MouseDriver()
+        {
+            PressedButtons = new bool[(int)MouseButton.Count];
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        private static MouseButton DriverButtonToMouseButton(uint rawButton)
+        {
+            Debug.Assert(rawButton > 0 && rawButton <= (int)MouseButton.Count);
+
+            return (MouseButton)(rawButton - 1);
+        }
+
+        public void Update(SDL_Event evnt)
+        {
+            if (evnt.type == SDL_EventType.SDL_MOUSEBUTTONDOWN || evnt.type == SDL_EventType.SDL_MOUSEBUTTONUP)
+            {
+                uint rawButton = evnt.button.button;
+
+                if (rawButton > 0 && rawButton <= (int)MouseButton.Count)
+                {
+                    PressedButtons[(int)DriverButtonToMouseButton(rawButton)] = evnt.type == SDL_EventType.SDL_MOUSEBUTTONDOWN;
+
+                    CurrentPosition = new Vector2(evnt.button.x, evnt.button.y);
+                }
+            }
+            else if (evnt.type == SDL_EventType.SDL_MOUSEMOTION)
+            {
+                CurrentPosition = new Vector2(evnt.motion.x, evnt.motion.y);
+            }
+            else if (evnt.type == SDL_EventType.SDL_MOUSEWHEEL)
+            {
+                Scroll = new Vector2(evnt.wheel.x, evnt.wheel.y);
+            }
+        }
+
+        public void SetClientSize(int width, int height)
+        {
+            _clientSize = new Size(width, height);
+        }
+
+        public bool IsButtonPressed(MouseButton button)
+        {
+            return PressedButtons[(int)button];
+        }
+
+        public Size GetClientSize()
+        {
+            return _clientSize;
+        }
+
+        public string DriverName => "SDL2";
+
+        public event Action<string> OnGamepadConnected
+        {
+            add { }
+            remove { }
+        }
+
+        public event Action<string> OnGamepadDisconnected
+        {
+            add { }
+            remove { }
+        }
+
+        public ReadOnlySpan<string> GamepadsIds => new[] { "0" };
+
+        public IGamepad GetGamepad(string id)
+        {
+            return new SDL2Mouse(this);
+        }
+
+        public void Dispose()
+        {
+            if (_isDisposed)
+            {
+                return;
+            }
+
+            _isDisposed = true;
+        }
+    }
+}