Support multiple "cards" about wlc HOT 6 OPEN

I wonder how xwayland applications would behave in this scenario? Is there something like multi-gpu support for xwayland?!

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Good question. I have no idea and it should be tested. We may need to open xwayland for each GPU.

Edit: Though this obviously does not work since we can't have output specific env variable for DISPLAY heh.

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We should also autodetect primary card here, instead of assuming card0.

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This info might be related: Wayland On Mesa Now Supports DRI_PRIME, Render Nodes https://phoronix.com/scan.php?page=news_item&px=Wayland-DRI-PRIME-Mesa-Nodes

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Can anyone provide a little insight on what is needed to support DRI_PRIME in wlc. I have a Docking Station for the Dell XPS (displaylink) that shows up as a second GPU in X11.

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Prime needs basically drm backend instance for each card. Same kind of thing is needed to support multiple displays on different GPU's. All the dirty work regarding support between GPUs should be handled by mesa as far I understand. That is copying rendered buffer to another GPU so it can push it to the display controller. This has bit of cost though, this is unavoidable with hybrid GPUs I guess, but with multi GPU + multi display setup, as long as you keep the buffer on the connected display controller there is no overhead.

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