ObjFW  History of src/platform/Linux/OFGameController.m of 4fc79b14dbb53d61

This allows to have a profile for limited gamepads such as found on the
Nintendo DS rather than only having the raw profile for those. file: [c35ba635a9] check-in: [998339ff24] user: js, branch: trunk, size: 18942 [annotate] [blame] [check-ins using] [diff]

The vast majority of controllers out there are Xbox 360-compatible
controllers, so let's use those button names by default. file: [c2e9c0c45a] check-in: [6b3b47c1f4] user: js, branch: trunk, size: 16414 [annotate] [blame] [check-ins using] [diff]

Let's leave 3 letter prefixes to 3rd parties. file: [a90f4bebdd] check-in: [afae3291bf] user: js, branch: trunk, size: 15304 [annotate] [blame] [check-ins using] [diff]

Right now only evdev is supported, support for others will be added back
later. file: [d527831ab5] check-in: [39639cd987] user: js, branch: trunk, size: 14502 [annotate] [blame] [check-ins using] [diff]

Since both are detected as separate devices, rotate them so that they
can be used as a single device.

A new class will be added to combine two Joy-Cons into one controller. file: [bcc812f365] check-in: [21bcf92ecd] user: js, branch: trunk, size: 22150 [annotate] [blame] [check-ins using] [diff]

This is required to get the initial state and when events get dropped. file: [5b6c618a19] check-in: [8e95537be5] user: js, branch: gamecontroller, size: 19393 [annotate] [blame] [check-ins using] [diff]

This also emulates a right analog stick using the C buttons on the N64
controller. file: [c33068523f] check-in: [a0af8f40b8] user: js, branch: gamecontroller, size: 16829 [annotate] [blame] [check-ins using] [diff]

It seems that just checking for the Xbox 360 controller VID/PID is not
sufficient, as there are a lot of controllers that are compatible with
it, but have a different VID/PID. However, they all use the xpad driver,
which returns BTN_X and BTN_Y, which in the Linux headers are equal to
BTN_NORTH and BTN_WEST - which is incorrect for an Xbox 360 controller.
It seems the Linux kernel is a huge mess where some drivers return what
is written on the button (such as Xbox 360 via the xpad driver, which
returns BTN_X/BTN_Y) and others where they are located (Sony, Nintendo,
which return BTN_NORTH/BTN_WEST). However, since Linux also maps
BTN_X/BTN_NORTH and BTN_Y/BTN_WEST to the same code, it's impossible to
figure out what the driver meant to do.

As grepping the kernel code for BTN_NORTH has revealed that not a lot of
drivers use it and given that most controllers these days are XInput
controllers (which are handled by the xpad driver), it makes more sense
to assume that a controller is an XInput controller and map the Xbox 360
buttons to their locations. It's much easier to keep a list of
controllers with drivers that actually return BTN_NORTH/BTN_WEST instead
of what's written on the button (so far it seems to be only Nintendo and
Sony) than to keep a list of all XInput controllers. file: [3b09a9b74f] check-in: [5fdf28dd29] user: js, branch: gamecontroller, size: 15216 [annotate] [blame] [check-ins using] [diff]

It turns out the quirk for all other controllers to swap north/west was
wrong, and the Xbox 360 controller is actually the one that has
north/west swapped.

The reason for this seems to be that Linux has BTN_NORTH and BTN_X
mapped to the same code, as well as BTN_WEST to BTN_Y. However, on the
Xbox 360 controller, Y is north and X is west. It seems that the Xbox
360 driver decided to return BTN_X and BTN_Y (so that the labels are
correct) while other drivers return BTN_NORTH and BTN_SOUTH (so that the
position is correct). file: [a14fd08793] check-in: [a4fa1b26f2] user: js, branch: gamecontroller, size: 15062 [annotate] [blame] [check-ins using] [diff]

As this is using XInput 1.3, only XInput-compatible devices are supported. file: [fb841c3ea2] check-in: [22f6f258d8] user: js, branch: gamecontroller, size: 13004 [annotate] [blame] [check-ins using] [diff]

This avoids retrieving it multiple times when reading multiple things. file: [ff55e4dc62] check-in: [0f902d87eb] user: js, branch: gamecontroller, size: 13005 [annotate] [blame] [check-ins using] [diff]