This commit has two main changes to the OSX HID driver:
1.
Some joysticks have invalid/incorrect 'use' assigned to buttons and
axes. For example, my RetroUSB.com Genesis Retroport reports 8 buttons,
but they're reported as 1, 2, 3, 4, 1, 2, 3, 4, and my RetroLink
Gamecube-clone controller reports 2 axes with id 50.
OSX assigns each of these elements a unique cookie value, so it's still
possible to uniquely identify a button. Whenever a controller is
connected, the driver scans for all buttons and axes. When it identifies
a duplicate 'use' id, it reassigns it a new ID.
Whenever the input callback is called, it grabs the cookie value,
finds the input element with a matching cookie, and uses that element's
id instead of the one reported by the device.
The old joystick configs should not be broken by this - I'm using the
existing 'use' value wherever possible, and only changing it when it's
broken.
The 'faked' ids are done in a deterministic way, a joystick will never
have a button's 'faked' id change between launches of RetroArch.
2.
This enables HAT switch input.
In order to have a controller working you need:
1) Have a matching HID autoconfig file in autoconfig/hid for your controller.
2) Create a "connect" driver for the pad in "input/connect" folder (source code of RA).
3) Once you are in RA, change the joystick driver to HID and restart.
4) You may be now able to use you USB HID compatible pad in RA.
I included some "connect" drivers as an example. It also need to include them for compilation.
