Support mouse buttons higher than 5

[muzikbike]

Looking at the code, it appears that up to five mouse buttons are supported: https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_mouse.h#L144

Buttons higher than the fifth, however, appear to be ignored. This means programs aren't able to use these (e.g. luanti-org/luanti#16750).

From my testing, KDE Plasma supports up to 48 distinct mouse buttons, and there are certainly devices that allow access to a considerable amount thereof (e.g. Logitech G600 has up to 20 of these). So an increase in the number of valid detectable mouse inputs would be of use for programs with rebindable controls.

[slouken]

Looking at the various mice that support lots of buttons, it looks like most of them expect to be bound to keyboard keys via proprietary configuration software. Do you have a mouse that is confirmed to show up with mouse button events using xev?

[muzikbike]

Here's the evtest output for my current mouse (button events 272 to 287 represent mouse buttons 1 to 16):

xev's output:

wev's output:

[slouken]

Perfect, thanks!

[muzikbike]

Key press inputs from 272 up to 319 are recognised as mouse buttons (for 48 in total).

[slouken]

Hmm, I have the G502 Hero mouse here as well, and evtest reports the same thing, but 5 of the buttons generate no evtest output and just change the profile and DPI settings. How do you configure this to use the extra buttons?

In this diagram, buttons 6, 7, 8, 11, and 12 all have the indicated DPI shift and profile select functionality.

[muzikbike]

https://github.com/libratbag/piper should work if you configure the button assignments accordingly:

[slouken]

Ah, that was very helpful, thank you!

[muzikbike]

You can assign up to button 16 via the command line; other mice like the G600 can presumably support more (I don't have one yet). I can provide a script that can be used to generate button press events for buttons 17 to 48.

[slouken]

This is fixed, thanks!