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Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in line with reality.

From Gerd Hoffmann <kraxel@redhat.com>
Newsgroups linux.kernel
Subject Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in line with reality.
Date 2017-04-18 15:50 +0200
Message-ID <txBG2-6LC-9@gated-at.bofh.it> (permalink)
References (1 earlier) <tuHoB-18n-7@gated-at.bofh.it> <tuIkG-1KS-27@gated-at.bofh.it> <tuJgK-2nZ-5@gated-at.bofh.it> <txyf8-4Ve-11@gated-at.bofh.it> <txzkS-5wU-19@gated-at.bofh.it>
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  Hi,

> > 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...

Yes, little endian host, qemu interprets the framebuffer as
PIXMAN_b8g8r8x8.  Which should be correct for a xrgb bigendian
framebuffer as pixman formats are native endian.

> > 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).

Well, I mean color glitches.  But it isn't consistent.  As if some
operations operate with the correct byteorder and some don't.
alpha/blue being swapped is a problem in some areas.

https://www.kraxel.org/tmp/

cheers,
  Gerd

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Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments  in line with reality. Pekka Paalanen <ppaalanen@gmail.com> - 2017-04-10 17:20 +0200
  Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in  line with reality. Ilia Mirkin <imirkin@alum.mit.edu> - 2017-04-10 18:20 +0200
    Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments  in line with reality. Pekka Paalanen <ppaalanen@gmail.com> - 2017-04-11 09:40 +0200
      Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments  in line with reality. Gerd Hoffmann <kraxel@redhat.com> - 2017-04-11 13:30 +0200
        Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments  in line with reality. Pekka Paalanen <ppaalanen@gmail.com> - 2017-04-13 09:50 +0200
      Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in  line with reality. Ilia Mirkin <imirkin@alum.mit.edu> - 2017-04-11 16:20 +0200
        Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in  line with reality. Ilia Mirkin <imirkin@alum.mit.edu> - 2017-04-17 08:50 +0200
          Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in  line with reality. Michel Dänzer <michel@daenzer.net> - 2017-04-18 05:00 +0200
            Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in  line with reality. Ilia Mirkin <imirkin@alum.mit.edu> - 2017-04-18 07:10 +0200
              Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in  line with reality. Michel Dänzer <michel@daenzer.net> - 2017-04-18 08:00 +0200
                Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments  in line with reality. Gerd Hoffmann <kraxel@redhat.com> - 2017-04-18 12:20 +0200
                Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in  line with reality. Michel Dänzer <michel@daenzer.net> - 2017-04-19 03:10 +0200
                Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in  line with reality. Ilia Mirkin <imirkin@alum.mit.edu> - 2017-04-19 05:20 +0200
                Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in  line with reality. Ilia Mirkin <imirkin@alum.mit.edu> - 2017-04-19 05:30 +0200
                Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments  in line with reality. Pekka Paalanen <ppaalanen@gmail.com> - 2017-04-19 09:20 +0200
                Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments  in line with reality. Gerd Hoffmann <kraxel@redhat.com> - 2017-04-19 14:40 +0200
  Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments  in line with reality. Gerd Hoffmann <kraxel@redhat.com> - 2017-04-18 12:10 +0200
    Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments  in line with reality. Pekka Paalanen <ppaalanen@gmail.com> - 2017-04-18 13:20 +0200
      Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments  in line with reality. Gerd Hoffmann <kraxel@redhat.com> - 2017-04-18 15:50 +0200
        Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments  in line with reality. Pekka Paalanen <ppaalanen@gmail.com> - 2017-04-18 16:10 +0200
          Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments  in line with reality. Gerd Hoffmann <kraxel@redhat.com> - 2017-04-18 23:00 +0200

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