From e3c2f0e119d0c0e38ddd8ddd68580232481e6503 Mon Sep 17 00:00:00 2001
From: cosmonaut <evan@moonside.games>
Date: Wed, 5 Apr 2023 16:52:36 -0700
Subject: [PATCH] fix controller hot swapping

---
 src/Input/Gamepad.cs | 14 ++++++++++++++
 src/Input/Input.cs   |  4 ++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/Input/Gamepad.cs b/src/Input/Gamepad.cs
index 7b53b3f9..14c9982b 100644
--- a/src/Input/Gamepad.cs
+++ b/src/Input/Gamepad.cs
@@ -195,6 +195,20 @@ namespace MoonWorks.Input
 			};
 		}
 
+		public void Register(IntPtr handle)
+		{
+			Handle = handle;
+
+			IntPtr joystickHandle = SDL.SDL_GameControllerGetJoystick(Handle);
+			JoystickInstanceID = SDL.SDL_JoystickInstanceID(joystickHandle);
+		}
+
+		public void Unregister()
+		{
+			Handle = IntPtr.Zero;
+			JoystickInstanceID = -1;
+		}
+
 		internal void Update()
 		{
 			AnyPressed = false;
diff --git a/src/Input/Input.cs b/src/Input/Input.cs
index 088fa43e..5ac31dfe 100644
--- a/src/Input/Input.cs
+++ b/src/Input/Input.cs
@@ -95,7 +95,7 @@ namespace MoonWorks.Input
 					}
 					else
 					{
-						gamepads[slot].Handle = openResult;
+						gamepads[slot].Register(openResult);
 						System.Console.WriteLine($"Gamepad added to slot {slot}!");
 					}
 					return;
@@ -112,7 +112,7 @@ namespace MoonWorks.Input
 				if (joystickInstanceID == gamepads[slot].JoystickInstanceID)
 				{
 					SDL.SDL_GameControllerClose(gamepads[slot].Handle);
-					gamepads[slot].Handle = IntPtr.Zero;
+					gamepads[slot].Unregister();
 					System.Console.WriteLine($"Removing gamepad from slot {slot}!");
 					return;
 				}