Draft: CRT SwitchRes Linux EDID PoC

[syboxez]

Guidelines

1. Rebase before opening a pull request
2. If you are sending several unrelated fixes or features, use a branch and a separate pull request for each
3. If possible try squashing everything in a single commit. This is particularly beneficial in the case of feature merges since it allows easy bisecting when a problem arises

Description

Extremely hacky PoC for using CRT CwitchRes to generate a single-use EDID and apply that EDID as root to a specific display. Very inelegant, some hardcoding going on, overwrites KMS and X11 modesetting with EDID overwrites (to test the PoC in multiple environments, such as KMS, Wayland, and X11)

Related Issues

Currently, RetroArch does not support CRT SwitchRes in Wayland environments and may or may not have support for DRM/KMS environments.

Currently RetroArch will set standard video modes in KMS but will not generate new modes, and switchres has WIP support for DRM/KMS modeswitching that relies on a kernel patch.

This commit does not require a kernel patch and will use an external switchres binary to generate a single-use EDID binary containing a single modeline (switchres does not support generating EDID binaries when running as a library from what I've seen).

Related Pull Requests

Potentially a future PR for switchres to add support for generating an edid in the API

Reviewers

@hunterk @antonioginer @alphanu1

I am expecting to have to completely delete this commit and redo it with a much cleaner strategy. Would appreciate comments.

[LibretroAdmin]

Sounds great, @alphanu1 @hunterk @antonioginer let us know what you think.