Input Capture List System with Fallback Support

[lievin-christopher]

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Feature Request

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Description:
This feature request aims to implement a unified input capture system analogous to the video capture method, consolidating support for all input methods into a centralized list. This will streamline input handling and improve user experience by ensuring robust fallback mechanisms.

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Problem Context

Following the changes in PR #2606, the fallback to XTest in case of UInput errors was lost. Additionally, the current requirement to use the CMake variable -DSUNSHINE_USE_INPUTTINO=OFF introduces unnecessary complexity for users, forcing them to avoid official packages.

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Proposed Solution

1. Centralized Input Method List
   Create a structured list of supported input methods, including:

   • uhid (via inputtino.cpp)
   • uinput (via legacy_input.cpp)
   • XTest (via legacy_input.cpp ?)

2. Automated Fallback Mechanism
   Restore and enhance fallback logic:

   • If uhid fails, automatically attempt uinput.
   • If uinput fails, automatically attempt XTest.
   • Add configurable priority ordering for input methods.

Why This Matters:
This change will:

• Reduce technical barriers for users.
• Ensure compatibility with environments where uhid or uinput may fail.
• Facility to add others input method (like https://github.com/orgs/LizardByte/discussions/68 )
• Align input handling with the organization and usability of video capture methods.

Let me know if further details or adjustments are needed!

[ReenigneArcher]

Following the PR you mentioned, legacy_input was removed altogether. We only support inputtino at the current time on Linux.

Ensure compatibility with environments where uhid or uinput may fail.

Which environments will these fail in?

P.S. There is an open PR to try to fix some permission issues around the new input system. If you'd like to test it, that would be much appreciated! LizardByte/Sunshine#3748 I am planning to merge it soon.

[lievin-christopher]

I'm using sunshine in an LXC on a proxmox server, so add more dev in an LXC can create some odd issues.
So maybe my configuration is the issue, but i got no problem with sunshine v0.23.1. (I'll surely create an issue to get some help)

P.S. I have tries your PR, but this doesn't fix my issue, I suspect my issue is between X11 and sunshine