On Mon, 10 Apr 2017 16:17:27 +0200 Gerd Hoffmann <kraxel@xxxxxxxxxx> wrote: > Hi, > > > which software have you used as representative of "reality"? > > 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... But even if this actually is a valid example of software we must keep working as is, well, ouch. But if I cannot show that your fix breaks anything, then I suppose you win. Your proposal would certainly solve the dilemma we have with wl_shm formats in Wayland. I also wonder if a real BE machine could have different results than the virtual machine. Thanks, pq > Didn't try wayland. Can do, but will take a while. Don't have a > wayland-capable guest install at hand, and installing one takes a while > because I don't have a physical pseries and emulation is slooooww. > > > To solve that problem, we would like to know if anything existing would > > break for each possible solution, but no developers using BE have really > > turned up. > > That is part of the problem. > And even ppc is moving to little endian these days ... > > cheers, > Gerd >
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