From: Pekka Paalanen <ppaalanen@gmail.com> To: Gerd Hoffmann <kraxel@redhat.com> Cc: dri-devel@lists.freedesktop.org, open list <linux-kernel@vger.kernel.org>, amd-gfx@lists.freedesktop.org, Daniel Vetter <daniel.vetter@intel.com>, Ilia Mirkin <imirkin@alum.mit.edu> Subject: Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in line with reality. Date: Tue, 18 Apr 2017 14:18:27 +0300 [thread overview] Message-ID: <20170418141827.11634103@eldfell> (raw) In-Reply-To: <1492509617.27392.19.camel@redhat.com> [-- Attachment #1: Type: text/plain, Size: 2077 bytes --] On Tue, 18 Apr 2017 12:00:17 +0200 Gerd Hoffmann <kraxel@redhat.com> 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 [-- Attachment #2: OpenPGP digital signature --] [-- Type: application/pgp-signature, Size: 833 bytes --]
WARNING: multiple messages have this Message-ID (diff)
From: Pekka Paalanen <ppaalanen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> To: Gerd Hoffmann <kraxel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Cc: Daniel Vetter <daniel.vetter-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>, amd-gfx-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org, Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org>, open list <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, dri-devel-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org Subject: Re: [RfC PATCH] drm: fourcc byteorder: brings header file comments in line with reality. Date: Tue, 18 Apr 2017 14:18:27 +0300 [thread overview] Message-ID: <20170418141827.11634103@eldfell> (raw) In-Reply-To: <1492509617.27392.19.camel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> [-- Attachment #1.1: Type: text/plain, Size: 2106 bytes --] On Tue, 18 Apr 2017 12:00:17 +0200 Gerd Hoffmann <kraxel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> 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 [-- Attachment #1.2: OpenPGP digital signature --] [-- Type: application/pgp-signature, Size: 833 bytes --] [-- Attachment #2: Type: text/plain, Size: 154 bytes --] _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx
next prev parent reply other threads:[~2017-04-18 11:18 UTC|newest] Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-04-10 10:12 [RfC PATCH] drm: fourcc byteorder: brings header file comments in line with reality Gerd Hoffmann 2017-04-10 10:12 ` Gerd Hoffmann 2017-04-10 12:02 ` Daniel Vetter 2017-04-10 12:02 ` Daniel Vetter 2017-04-10 16:28 ` Alex Deucher 2017-04-10 16:28 ` Alex Deucher 2017-04-10 13:12 ` Pekka Paalanen 2017-04-10 13:12 ` Pekka Paalanen 2017-04-10 14:17 ` Gerd Hoffmann 2017-04-10 14:17 ` Gerd Hoffmann 2017-04-10 14:45 ` Ilia Mirkin 2017-04-10 14:45 ` Ilia Mirkin 2017-04-10 16:26 ` Alex Deucher 2017-04-10 16:26 ` Alex Deucher 2017-04-10 15:09 ` Pekka Paalanen 2017-04-10 15:09 ` Pekka Paalanen 2017-04-10 16:10 ` Ilia Mirkin 2017-04-10 16:10 ` Ilia Mirkin 2017-04-11 7:31 ` Pekka Paalanen 2017-04-11 7:31 ` Pekka Paalanen 2017-04-11 11:23 ` Gerd Hoffmann 2017-04-11 11:23 ` Gerd Hoffmann 2017-04-13 7:44 ` Pekka Paalanen 2017-04-13 7:44 ` Pekka Paalanen 2017-04-11 14:18 ` Ilia Mirkin 2017-04-11 14:18 ` Ilia Mirkin 2017-04-17 6:43 ` Ilia Mirkin 2017-04-18 2:53 ` Michel Dänzer 2017-04-18 2:53 ` Michel Dänzer 2017-04-18 5:04 ` Ilia Mirkin 2017-04-18 5:04 ` Ilia Mirkin 2017-04-18 5:58 ` Michel Dänzer 2017-04-18 5:58 ` Michel Dänzer 2017-04-18 10:14 ` Gerd Hoffmann 2017-04-18 10:14 ` Gerd Hoffmann 2017-04-19 1:01 ` Michel Dänzer 2017-04-19 1:01 ` Michel Dänzer 2017-04-19 3:19 ` Ilia Mirkin 2017-04-19 3:19 ` Ilia Mirkin 2017-04-19 3:28 ` Ilia Mirkin 2017-04-19 3:28 ` Ilia Mirkin 2017-04-19 7:09 ` Pekka Paalanen 2017-04-19 7:09 ` Pekka Paalanen 2017-04-19 12:34 ` Gerd Hoffmann 2017-04-19 12:34 ` Gerd Hoffmann 2017-04-18 10:00 ` Gerd Hoffmann 2017-04-18 10:00 ` Gerd Hoffmann 2017-04-18 11:18 ` Pekka Paalanen [this message] 2017-04-18 11:18 ` Pekka Paalanen 2017-04-18 13:39 ` Gerd Hoffmann 2017-04-18 13:39 ` Gerd Hoffmann 2017-04-18 14:01 ` Pekka Paalanen 2017-04-18 14:01 ` Pekka Paalanen 2017-04-18 20:50 ` Gerd Hoffmann 2017-04-18 20:50 ` Gerd Hoffmann
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