On Wed, Jan 4, 2017 at 7:03 AM, Daniel Stone <daniel@xxxxxxxxxxxxx> wrote: >> Speaking of compression for display, especially the separate >> compression buffer: That should be fully contained in the main DMABUF >> and described by the per-BO metadata. Some other drivers want to use a >> separate DMABUF for the compression buffer - while that may sound good >> in theory, it's not economical for the reason described above. > > 'Some other drivers want to use a separate DMABUF', or 'some other > hardware demands the data be separate'. Same with luma/chroma plane > separation. Anyway, it doesn't really matter unless you're sharing > render-compression formats across vendors, and AFBC is the only case > of that I know of currently. jfwiw, UBWC on newer snapdragons too.. seems like we can share these not just between gpu (render to and sample from) and display, but also v4l2 decoder/encoder (and maybe camera?) I *think* we probably can treat the metadata buffers as a separate plane.. at least we can for render target and blit src/dst, but not 100% sure about sampling from a UBWC buffer.. that might force us to have them in a single buffer. (Either way, the fourcc modifiers, and related EGL extension to query modifiers, should be sufficient) BR, -R _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
