Retroarch: support for multiple mice in linux via the udev input driver

[markwkidd]

This issue started in the Multiple Mice issue/bounty.

@casdevel requested that a new issue be opened dealing with the specifics of the udev input driver. @mediamoshpit has been testing the udev implementation on a RetroPie installation where it doesn't seem to be working.

mediamoshpit's log file is below:
https://pastebin.com/nvFZ2xNA

[ghost]

@mediamoshpit set user 2 mouse index to 2 and try some MAME 2003 game. Let me know if that make a difference.

[ghost]

only on udev?

[mediamoshpit]

It had been suggested that I also test with raw, but the results were the same. I plan on testing the above suggestion as early as this evening.

[telanus]

Hi

Was asked to report here

I tried this evening with 2 mice on Ubuntu Mate 16.04.

Original report:

First tried just as is, and RA crashes when I press 2 (for a 2-player game), then tried and made ubuntu setup both as mice separately, and didn't get a crash, but pressing the second mouse button (on the calibration screen) pauses the emulation

tried @casdevel's idea of setting user 2 mouse to index 2 and still no joy.

Log file: https://pastebin.com/MDAkqJSQ
attached my cfg file
retroarch.cfg.zip

[ghost]

@telanus You are using x input driver. Multiple mice support is available with udev input driver only (and raw input driver on Windows). Before changing input driver to udev visit https://github.com/libretro/RetroArch/wiki/Input-drivers-in-Linux-without-Xorg.

[telanus]

@casdevel did what the wiki said and still won't work :(

https://pastebin.com/BwppvadV < current log

[ghost]

Log looks OK, mice should be at index 0 and 1. Maybe there are some issues with Terminator 2 game.
Can you try Area 51 game?

[mediamoshpit]

I've tried 'Area 51' before and it's a bit more than the Pi3 can handle running with the RetroArch overhead. However, I'll see if I can at least get it into a gun calibration mode. Aside from 'Terminator 2', I have also tested the multiple mice option with 'Revolution X' and the results were the same.

[telanus]

I got it to work with Jurrasic Park, Alien3: The Gun & Point Blank (but it suffers from disjointed aiming system, where the aim and the location of the shot is two different place)

[mediamoshpit]

While still slow, 'Area 51' ran well enough to test, but it gave the same results. I can get the two mice to react independently, but they never work together. It's likely to read the same, but my verbose log for this test is linked below.

https://pastebin.com/SSUzGVMY

@telanus Are you using a Raspberry Pi running Raspbian in your tests?

[mediamoshpit]

I hadn't rebuilt Retroarch or Mame2003 since I last tested all this, so I decided to rebuild from the latest nightlies and all is working well now. 'Terminator 2', 'Revolution X' and 'Area 51' all recognize both mice at the same time.

[markwkidd]

@telanus can you make sure you have the latest nightly of RetroArch and the latest buildbot core for MAME 2003? I ask because of @mediamoshpit 's update: https://github.com/libretro/RetroArch/issues/5135#issuecomment-313565069

[ghost]

@telanus try swapping "P1 Button 1" and "P2 Button 1" mapping in MAME2003 settings.

[telanus]

@mediamoshpit I'm on Ubuntu (and on a desktop)

@casdevel tried that and aiming is still horrible on pblank, the other are fine

[ghost]

@telanus on my machine Alien 3 works fine with multiple mice. If on your machine other games work fine with multiple mice then this isn't input driver issue.