<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - [regression] weston-simple-egl not running anymore inside qemu" href="https://bugs.freedesktop.org/show_bug.cgi?id=86701#c13">Comment # 13</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - [regression] weston-simple-egl not running anymore inside qemu" href="https://bugs.freedesktop.org/show_bug.cgi?id=86701">bug 86701</a> from <a class="email" href="mailto:daniel@fooishbar.org" title="Daniel Stone <daniel@fooishbar.org>"> Daniel Stone</a> <pre>Two reasons why VGEM is less helpful on Wayland than X11: - MIT-SHM on X forces you to allocate out of POSIX/SysV (forget which) SHM regions, i.e. shmat() and friends; this is not true of wl_shm, which lets you specify an arbitrary fd, as long as it's mmap()able - MIT-SHM requires you to schedule a server-side copy out of the SHM Image to a Drawable (Pixmap or Window), whereas DRI2 adds the notion of flips and exchanging storage; this is not true of wl_shm, as the wl_surface/wl_buffer model natively supports buffer exchange So I think just the relatively obvious wl_shm approach - which is less divergent from the existing platform_wayland.c code than platform_x11's, given that it shares the same buffer<->surface relationship, only diverging at buffer allocation - will do just fine.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>