On 10.09.2020 16:32, Maciej Pijanowski wrote: > > Hello, > > I'm having exactly the same issue as described in the [1]. > I have a custom Yocto build running on the embedded board > with Mali GPU. Mali GPU was also used in the mentioned thread. > So maybe there is something in common. > > When RDP backend is used as a main backend > (in the core section) I can see the screen content in the RDP client. > When the core backend is DRM and the RDP is started via the screen-share > plugin, I can only see the black screen in the RDP client (although > the input works > correctly). > > I tried running the same combination on Fedora VM or on the RPi4 > and in those cases the screen-share works correctly with RDP. > > I've been looking for some differences in the logs between those setups. > I have noticed the EGL config in case of Mali to be different than in case > of the other ones. > > Mali: > > [07:24:23.919] Bad/unknown DRM format code 0x00000000. > [07:24:23.919] Unable to use first choice EGL config with XRGB8888, > succeeded with alternate ARGB8888. > ... > [07:24:23.923] GL version: OpenGL ES 2.0 "fa33ed7" > [07:24:23.923] GLSL version: OpenGL ES GLSL ES 1.00 > [07:24:23.923] GL vendor: ARM > [07:24:23.923] GL renderer: Mali-400 MP > ... > [07:24:24.006] Chosen EGL config details: id: 9 rgba: 8 8 8 8 buf: 32 > dep: 24 stcl: 8 int: 0-10 type: win|pix|pbf|swap_preserved vis_id: > ARGB8888 > (0x34325241) > > RPi: > > [07:04:41.917] GL version: OpenGL ES 3.1 Mesa 20.0.2 > [07:04:41.917] GLSL version: OpenGL ES GLSL ES 3.10 > [07:04:41.917] GL vendor: Broadcom > [07:04:41.917] GL renderer: V3D 4.2 > ... > [07:04:42.032] Chosen EGL config details: id: 17 rgba: 8 8 8 0 buf: 24 > dep: 0 stcl: 0 int: 1-1 type: win vis_id: XRGB8888 (0x34325258) > > > I've changed the format on the RPi ARGB8888 and it still works fine. > So I've been investigating this issue further. I've checked for the pixeldata here [2] and in the cases with the black screen there was nothing dumped.
I have traced it further back to the glReadPixels call [3]. Once I switched the pixel format to the PIXMAN_a8b8g8r8 (gl_format to GL_RGBA) it started to work correctly. Both VNC [4] and RDP backends now work fine with the screen-share on platform with Mali GPU and libMali blob. As I got this working, I could just patch the code to use the given pixel format. But I would prefer to fix things upstream. Any hints on what would be "the proper" way of fixing this issue are welcome. I also added Stefan Agner to CC as he was changing this part of the code lately in screen-share and we were discussing this matter in [5]. I hope this is fine. Thanks, [2] https://gitlab.freedesktop.org/wayland/weston/-/blob/master/compositor/screen-share.c#L888 [3] https://github.com/3mdeb/weston/blob/use_GL_RGBA/libweston/renderer-gl/gl-renderer.c#L1551 [4] https://gitlab.freedesktop.org/wayland/weston/-/merge_requests/36 [5] https://gitlab.freedesktop.org/wayland/weston/-/merge_requests/362#note_623870 > > One more observation - if I forced the DRM backend to use the pixman > renderer > (by adding the use-pixman=true in the weston.ini), the cloned content > appeared > correctly in the RDP client. Of course the performance and usability > dropped, > as the GPU was no longer used for rendering. > It clearly suggests that the problem is somewhere around the Mali library. > > Any suggestions how to approach further debugging of these kind of issues > are highly appreciated. > > Thank you > > [1] > https://lists.freedesktop.org/archives/wayland-devel/2019-April/040382.html > > -- > Maciej Pijanowski > Embedded Systems Engineer > GPG: 9963C36AAC3B2B46 > https://3mdeb.com | @3mdeb_com > > _______________________________________________ > wayland-devel mailing list > wayland-devel@lists.freedesktop.org > https://lists.freedesktop.org/mailman/listinfo/wayland-devel -- Maciej Pijanowski Embedded Systems Engineer GPG: 9963C36AAC3B2B46 https://3mdeb.com | @3mdeb_com
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