// We have three ways that cause the input system to be initialized:
// 1. Normal game/editor startup.
// 2. Domain reload in editor (after script changes or when entering playmode).
// 3. Manual Reset() from tests.
//
// 1 is initiated from InitializeOnLoad on editor startup and from RuntimeInitializeOnLoadMethod
// in the player.
//
// 2 is initiated from RuntimeInitializeOnLoadMethod both in the editor and in the player. However,
// InitializeOnLoad will *also* trigger in the editor.
//
// 3 is triggered from the Reset() method below.
static InputSystem()
{
#if UNITY_EDITOR
// This gets run after every appdomain initialization. If it's a domain reload,
// we probably have an InputSystemManager sticking around from before.
//
// NOTE: InitializeOnLoad in the editor will get executed *before* heap state is
// restored, so it is paramount that we do not attempt to access any of the
// serialized state until after OnEnable() has been called on InputSystemManager.
InputSystemManager[] array = Resources.FindObjectsOfTypeAll <InputSystemManager>();
s_Input = array.Length > 0 ? array[0] : null;
#endif
if (s_Input == null)
{
Reset();
}
}
internal static void Reset()
{
// Grab the manager for native devices as we want those to survive the reset.
NativeInputDeviceManager oldNativeDeviceManager = null;
if (s_Input != null)
{
oldNativeDeviceManager = s_Input.nativeDeviceManager;
}
// Also, we want all profiles to survive the reset.
InputDeviceProfileManager oldProfileManager = null;
if (s_Input != null)
{
oldProfileManager = s_Input.profileManager;
}
// And we want no native events still going to the old native event manager.
if (s_Input != null)
{
s_Input.nativeEventManager.Uninitialize();
}
// Create blank input system state.
s_Input = ScriptableObject.CreateInstance <InputSystemManager>();
s_Input.hideFlags = HideFlags.HideAndDontSave;
// Hand existing profiles over to the new profile manager. We can't simply replace
// the profile manager with the old one because InputSystemManager has already wired
// up state using the new profile manager.
if (oldProfileManager != null)
{
s_Input.profileManager.StealProfilesFrom(oldProfileManager);
}
// Recreate native devices, if we had them before.
if (oldNativeDeviceManager != null)
{
s_Input.nativeDeviceManager.RecreateNativeDevicesFrom(oldNativeDeviceManager);
oldNativeDeviceManager.Uninitialize();
}
}