Hi On Thu, Feb 17, 2022 at 9:36 PM Marc-André Lureau < marcandre.lur...@gmail.com> wrote:
> > On Thu, Feb 17, 2022 at 9:25 PM Akihiko Odaki <akihiko.od...@gmail.com> > wrote: > >> >> > btw, I suppose you checked your DBus changes against the WIP >> "qemu-display" project. What was your experience? I don't think many people >> have tried it yet. Do you think this could be made to work on macOS? at >> least the non-dmabuf support should work, as long as Gtk4 has good macOS >> support. I don't know if dmabuf or similar exist there, any idea? >> >> >> >> I tested it on Fedora. I think it would probably work on macOS but >> >> maybe require some tweaks. IOSurface is a counterpart of DMA-BUF in >> >> macOS but its situation is bad; it must be delivered via macOS's own >> >> IPC mechanisms (Mach port and XPC), but they are for server-client >> >> model and not for P2P. fileport mechanism allows to convert Mach port >> >> to file descriptor, but it is not documented. (In reality, I think all >> >> of the major browsers, Chromium, Firefox and Safari use fileport for >> >> this purpose. Apple should really document it if they use it for their >> >> app.) It is also possible to share IOSurface with a global number, but >> >> it can be brute-forced and is insecure. >> >> >> > >> > Thanks, the Gtk developers might have some clue. They have been working >> on improving macOS support, and it can use opengl now ( >> https://blogs.gnome.org/chergert/2020/12/15/gtk-4-got-a-new-macos-backend-now-with-opengl/ >> ). >> >> They don't need IPC for passing textures so that is a different story. >> > > Yes but they have web-engine and video decoding concerns (beside > qemu/dmabuf gtk display they should be aware of). I'll try to reach > Christian about it. > > fwiw, here is Christian Hergert comment about texture sharing & gtk on macos: "There is, and we are using it in GTK 4 as of 4.6 to render from OpenGL to a surface we can attach to CALayers or OpenGL textures. It has allowed us to do a bunch of tricks to ensure we have opaque surfaces since NSWindow doesn't have anything like set_opaque_region() from Wayland. It's called IOSurface and the browsers use this to pass rendererings between processes." -- Marc-André Lureau
