On Mon, 07 Dec 2015 13:29:02 -0500 and...@acorn.pw wrote: > From the man page for weston-drm: > > >Combining multiple graphics devices are not supported yet. > > Is there any plan for implementing this or no interest? What would be > involved in adding support for multiple output devices?
Hi, I'm not aware of a solid plan written anywhere. Surely there is interest, but not high enough on anyone's TODO so far to my knowlege. This question is two-fold: - compositor support - full client support Compositor support would involve being able to open multiple DRM KMS device nodes and lighting up all outputs across several cards. This is the smaller part of the two. With DRM-backend and the Pixman-renderer, it should be mostly just typing. With GL-renderer you will need to start considering how to get one GPU use the textures from another, or how to get the other GPU scan out the image rendered with this GPU. All the infrastructure for that should be in place though, as PRIME and reverse-PRIME are already working things on Xorg AFAIK. The question left open is which GPU does a client use. Full client support is more complicated. The compositor opens one or more GPU devices and supports EGL-clients on any set of them. Clients would need to be informed somehow which devices can be supported. Clients also need API for choosing the GPU to render on (there are several EGL extensions brewing). A client might even choose a GPU the compositor is not using at all, in which case you need an alternative buffer sharing path, e.g. dmabuf. To use dmabuf, you then need a way to export rendered dmabufs from EGL, or rather create compositor-supported dmabufs somehow and import them to EGL for rendering in the client. How to hide all that behind a generic EGL API is certainly unclear to me. Full client support touches a lot of things, and on some areas there is work going on already, if slow on interest, for example: http://patchwork.freedesktop.org/patch/55444/ Support code in libdrm seems to have already landed. Thanks, pq
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