XInput and HID - architecture

[Vincent Povirk]

> Wine is supposed to mimic Windows' behavior as well as possible. Thus,
> the proper way to implement xinput would be to access the USB devices
> directly. The hid->xinput mapping is already non-compliant with the
> windows behavior, but currently necessary. However, in my opinion, we
> should only try to parse those HID descriptors that correspond to XInput
> devices, as provided by common XInput->HID drivers on different host
> OSs. Nevertheless, once wine's HID->Xinput backend is finished, the
> end-users can (locally) add their own mappings for any HID controller
> they want to use. I just wouldn't add those mappings to the wine repo.
> I would like to get some input on that, however. Do you think we should
> add mappings for non-xinput devices?

I see no reason not to include mappings for devices with a layout
matching that of xbox controllers, even if they are not accessible
through xinput on Windows. We only have to do what Windows does when
applications depend on it.