On Tue, 18 Apr 2017 12:00:17 +0200 Gerd Hoffmann <kraxel@xxxxxxxxxx> wrote: > Hi, > > > > ppc64 (big endian) virtual machine, running with qemu stdvga & bochs-drm > > > driver. Xorg with modesetting driver uses DRM_FORMAT_XRGB8888 (one and > > > only format supported by bochs-drm), and we have to interpret that in > > > bigendian byte order on the host side to get a correct display. > > > > I wonder if that is just an oversight from trying to match OpenGL > > formats to DRM formats. It's full of gotcha's. > > > > Did you try with GLAMOR? Do you see a difference with and without > > GLAMOR? Hmm, but you have no GPU support, so GLAMOR would be through a > > Mesa software renderer? I think I heard someone say something about > > Mesa software on BE... > > So, did some more testing to see where we stand. > > Historical note: RHEL-6.9 (gnome 2) works fine. Not of much interest > here, it drives the qemu stdvga with offb, not bochs-drm. I suppose this proves the virtual machine itself is correct about framebuffer endianess? Except you are running it on a little-endian host machine I presume... > More interesting: RHEL-7.3 (gnome 3.14) works fine too. kernel 3.10, > but drm drivers updated to roughly 4.6 level. Runs bochs-drm. mesa > 11.2.2. glamour not used. > > Most recent: Fedora 25 (gnome 3.22) looks mostly ok, but there are > rendering glitches, for example in the gnome activities screen (the one > you get when you press the windows key). kernel 4.10, mesa 13.0.4. > glamor not used, but I think gnome-shell uses opengl (via llvmpipe) for > compositing. I believe glitches are irrelevant for this topic, what we are interested in is if the colors are right or byte-swapped (also mind alpha/blue etc. swaps). > btw: is there some way to start a wayland session from a shell (i.e. > what startx does for xorg)? Depends on which display server you want to start I believe. I don't know about anything else than Weston, which is 'weston' for a logind-enabled system. Thanks, pq
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