It's time for some #wlmirror development insights!
I've been having a weird issue with the experimental XDG Portal backend for almost a year now: When importing DMA-BUFs from the XDG Portal backend, the screen stays black. No idea what the issue is.
1/x
I have experimented a lot with Wayland, EGL, screencopy, and DMA-BUFs in the last few days (https://github.com/Ferdi265/wayland-experiments), and I was able to create a demo application that uses the same way to create a DMA-BUF that xdg-desktop-portal-wlr is using and imports and renders it correctly with EGL (screencopy_dmabuf_egl.c)
2/x
Now, I have hacked that code into #wlmirror and basically frankenstein'd it into the XDG Portal backend and it does import and render the DMA-BUF correctly! (just in a separate window, see screenshots)
3/x
The final step is figuring out what the heck is different between the regular wl-mirror code and the demo that makes it not work. Fingers crossed that this won't take another year 🤞
4/4
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