Message Handling

    // Global variables -------------------------------------------------------------------
    static Engine* ApplicationHandle = 0;

    // Default message handler ------------------------------------------------------------
    static LRESULT CALLBACK WndProc(HWND hwnd, UINT umessage, WPARAM wparam, LPARAM lparam)
    {
        switch(umessage)
        {
            // Check if the window is being destroyed
            case WM_DESTROY:
            {
                PostQuitMessage(0);
                return 0;
            }

            // Check if the window is being closed
            case WM_CLOSE:
            {
                PostQuitMessage(0);
                return 0;
            }

            // All other messages pass to the message handler in the system class
            default:
            {
                return ApplicationHandle->MessageHandler(hwnd, umessage, wparam, lparam);
            }
        }
    }

    // Application message handler --------------------------------------------------------
    LRESULT CALLBACK MessageHandler(HWND hwnd, UINT umessage, WPARAM wparam, LPARAM lparam)
    {
        switch(umessage)
        {
            // Check if a key has been pressed on the keyboard
            case WM_KEYDOWN:
            {
                // If a key is pressed send it to the input object so it can record that state
                mInput->KeyDown((unsigned int)wparam);
                return 0;
            }

            // Check if a key has been released on the keyboard
            case WM_KEYUP:
            {
                // If a key is released then send it to the input object so it can unset the state for that key
                mInput->KeyUp((unsigned int)wparam);
                return 0;
            }

            // All other messages pass to the default message handler
            default:
            {
                return DefWindowProc(hwnd, umessage, wparam, lparam);
            }
        }
    }