Way to get xinput controller both trigger values with rawinput

[mmozeiko]

I accidentally stumbled upon this interesting info: nefarius/ViGEmBus#40 (comment)

Turns out you can make xinput emulated HID device to report both trigger axis independently with some undocumented registry settings.
I've tried it with this Xbox One controller, and it worked for me - triggers are reported as Z Axis and Z Rotation independently:

20251202_105651.mp4

Only annoying thing is that these registry settings are in HKLM, so requires admin privileges. But if you're ok with your game installer adjusting them (or have small helper that elevates and fixes it at runtime), and you can live without rumble feature, then you can just use rawinput for xbox controller.

[mmozeiko]

I discovered that non-HID xusb device protocol is now public here: https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-xusbi/c79474e7-3968-43d1-8d2f-175d47bef43e

And it seems Xbox One controllers now use "GIP" protocol documented here: https://learn.microsoft.com/en-us/openspecs/windows_protocols/ms-gipusb/e7c90904-5e21-426e-b9ad-d82adeee0dbc
Which you can interact with without doing xinput, just opening special \\.\XboxGIP device. Here's a good writeup on that: https://gist.github.com/TheNathannator/bcebc77e653f71e77634144940871596

This is actually pretty cool. If you need only modern controller support on Windows, then you can just do RawInput + GIP. No need for xinput/xusb. Very neat!