[Question] Real fullscreen on Wayland about retroarch HOT 3 CLOSED

Thanks guys. I had a discussion with the labwc compositor authors, and got some compositor logs that show how RetroArch fares on Wayland with regards to Direct-scanout.
Long story short: RetroArch works perfect and goes into Direct-Scanout mode as expected. If you are interested:

labwc/labwc#1518 (reply in thread)

I am closing this. Thanks for passing by and commenting on this relatively obscure matter!

from retroarch.

I assume by "real" you're looking for mode setting. In which case I don't think it's something that wayland allows clients to do.

This is a good reference for what wayland clients can do: https://wayland.app/protocols/
You can see compositor support for each protocol at the bottom of the page.

If you're looking for more detail/rationale for a protocol there are good discussions in the MR's https://gitlab.freedesktop.org/wayland/wayland-protocols
The SDL source is also a good reference, it doesn't seem to differentiate SDL_WINDOW_FULLSCREEN_DESKTOP.

It could be that DRM lease could provide something interesting, but that would be pretty involved.

You should look for a application that has the behaviour you're looking for and look at the code.

from retroarch.

As I checked, there is a thing called fullscreen unredirect, which can bypass the compositor when the whole screen is covered, but it seems to be automatic without explicit enable/disable.

Mode setting (resolution / refresh rate change) is not available, this discussion mentions a few options, I believe RetroArch uses none of these.

from retroarch.