[#60] handle reconnecting gamepad

Currently, only the first window is referenced.... If we use more windows, we need to know how to handle this. Maybe we have to bind a gamepadIndex to a specific window.

include/vkcv/Window.hpp

@@ -74,6 +74,13 @@ namespace vkcv {
          */
 		static void onCharEvent(GLFWwindow *callbackWindow, unsigned int c);
 
+        /**
+         * @brief A callback function for handling gamepad re-connection.
+         * @param gamepadIndex The gamepad index.
+         * @param gamepadEvent The gamepad connection event.
+         */
+        static void onGamepadConnection(int gamepadIndex, int gamepadEvent);
+
         /**
          * @brief A callback function for gamepad input events.
          * @param gamepadIndex The gamepad index.

src/vkcv/Window.cpp

@@ -23,7 +23,7 @@ namespace vkcv {
 		glfwSetScrollCallback(m_window, Window::onMouseScrollEvent);
 		glfwSetCharCallback(m_window, Window::onCharEvent);
 	
-		glfwSetJoystickCallback(nullptr);
+		glfwSetJoystickCallback(Window::onGamepadConnection);
 		glfwSetJoystickUserPointer(GLFW_JOYSTICK_1, this);
     }
 
@@ -127,6 +127,16 @@ namespace vkcv {
 		}
     }
 
+    void Window::onGamepadConnection(int gamepadIndex, int gamepadEvent) {
+        if (gamepadEvent == GLFW_CONNECTED) {
+            auto window = static_cast<Window *>(glfwGetWindowUserPointer(s_Windows[0]));    // todo check for correct window
+
+            if (window != nullptr) {
+                glfwSetJoystickUserPointer(gamepadIndex, window);
+            }
+        }
+    }
+
     void Window::onGamepadEvent(int gamepadIndex) {
         auto window = static_cast<Window *>(glfwGetJoystickUserPointer(gamepadIndex));