GameCube Adapter support seems broken

[bemug]

Hi,

I'm on Linux running latest Arch.
I recall having my official Nintendo GameCube adapter working out of the box on SDL2 games. Now it doesn't seem to work anymore
I also recall testing this Godot PR adding SDL support for gamepad and it worked correctly. Now rebuilding with the same commit fails.
I built jstest-sdl to test and indeed it couldn't detect my gamepad either.

I'm new to SDL development and would like someone to double check if it working on its side.

[flibitijibibo]

Did you have to add a udev rule for the adapter back then? Not sure if Arch packages that somehow but that's usually the main reason it's not detected at first; this is the same rule that's documented for dolphin-emu.

[bemug]

I remember having the udev rules back then, since my dolphin install is pretty old and it comes in its packages :
https://gitlab.archlinux.org/archlinux/packaging/packages/dolphin-emu/-/blob/main/PKGBUILD?ref_type=heads#L136

On my machine :

$ cat /usr/lib/udev/rules.d/51-usb-device.rules 
#GameCube Controller Adapter
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="057e", ATTRS{idProduct}=="0337", TAG+="uaccess"

#Wiimotes or DolphinBar
SUBSYSTEM=="hidraw*", ATTRS{idVendor}=="057e", ATTRS{idProduct}=="0306", TAG+="uaccess"
SUBSYSTEM=="hidraw*", ATTRS{idVendor}=="057e", ATTRS{idProduct}=="0330", TAG+="uaccess"

I also have another file :

$ cat /etc/udev/rules.d/51-gcadapter.rules
SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="057e", ATTRS{idProduct}=="0337", MODE="0666"

That I should have created a while back when it was not packaged yet, as specified here :
https://fr.dolphin-emu.org/docs/guides/how-use-official-gc-controller-adapter-wii-u/

I tried removing both of them and unfortunately I still have the same issue. But AFAIK these rules are needed for SDL anyway.

[flibitijibibo]

Did a quick check and can confirm it works locally - if you happen to have FEZ on Steam you can opt into the sdl3 beta branch and see if the controller is detected there.

udev rule on my system at /etc/udev/rules.d/51-gcadapter.rules:

SUBSYSTEM=="usb", ENV{DEVTYPE}=="usb_device", ATTRS{idVendor}=="057e", ATTRS{idProduct}=="0337", MODE="0666"

[bemug]

Thank you for testing.

Interesting, I tried it on FEZ with the sdl3 and it works flawlessly. It does not on the main branch but I'm not sure it is supposed to.
May I ask you to try on an sdl2 game ? Or maybe a tool such as jstest-sdl for simplicity ?

[flibitijibibo]

It's been a while but I think the beta branch of FEZ is on 2.30.x, which I built with autoconf - if that build doesn't work I should be able to figure things out locally.

[bemug]

The beta branch is working. Strange.

[flibitijibibo]

The only thing I can think of is that 2.0 still requires passing --enable-hidapi-libusb to configure, not sure what CMake needs since 3.0 defaults to it being enabled...

[bemug]

Since it seems to be on my side I'll close the issue.
Thanks a lot for helping me debug this.

I'll reopen if I find anything new.

[bemug]

I figured it out.

If --enable-hidapi-libusb is required, then this update to the Arch package is causing the issue : it removes the SDL_HIDAPI_LIBUSB flag.
It was 2 months ago, so it matches my timeline.

The linked issue states the same issue as me. Case solved.

[bemug]

Now I'm confused, #9821 should whitelist the gamecube adapter and make it work without needing the flag right ? Or is SDL_HIDAPI_LIBUSB_WHITELIST defaulting to false ?

[slouken]

--enable-hidapi-libusb is required, the whitelisting changes just make it possible to enable by default.