Beirdobot, irc.freenode.net

Thursday, August 31st, 2017, 00:25 UTC

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stuarta:

rebuilt the rpi stretch image from scratch and it certainly looks better already

[09:06:42]

stuarta:

now just have 6hrs of compiling ahead to find out if it has worked

[09:38:33]

stuarta:

and actually, the experimental opengl looks great, glxgears is much better than with the legacy interface

[09:38:46]

stuarta:

unfortunately i suspect qt5 won't work with it

[09:40:44]

stuarta:

that's what peterbennett said anyway

[10:03:00]

stuarta:

well it's off and building

[10:04:46]

stuarta:

\o/ woot. f26 arm boots on a qemu virt

[10:05:27]

stuarta:

may have to try the same procedure with raspbian

[10:09:52]

** stuarta realizes it may have been a good idea to add some swap space on the external hdd **

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** stuarta facepalms **

[16:55:57]

stuarta:

--disable-openmax is not implemented

[16:56:00]

stuarta:

sigh

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[17:49:17]

peterbennett:

OpenGL seem to be broken in master and fixes/29

[17:50:47]

stuarta:

it's broken on f26, but only with wayland

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peterbennett:

Trying to figure out which commit broke it

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[19:10:15]

peterbennett:

OK OpenGL fixed now.

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[19:33:34]

stuarta:

peterbennett: nice

[19:33:51]

stuarta:

sadly it wasn't the cause of my vaapi under wayland issues :(

[19:36:49]

stuarta:

that remains a can of worms

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[19:45:11]

peterbennett:

There is an environment variable QT_XCB_GL_INTEGRATION that somehow controls how OpenGL is used

[19:45:55]

stuarta:

i shall keep that in mind

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[19:46:16]

peterbennett:

So maybe there is some value for wayland integration that can be set

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[19:47:48]

stuarta:

so the upside of now being able to disable openmax, is i only link with /usr/lib/arm-linux-gnueabihf/libEGL.so.1

[19:47:55]

stuarta:

however some other stuff doesn't work

[19:49:02]

peterbennett:

https://github.com/qt/qtwayland has some info

[19:49:05]

peterbennett:

QT_WAYLAND_CLIENT_BUFFER_INTEGRATION=xcomposite-glx

[19:49:33]

peterbennett:

So you are trying to disable openmax on the raspberry pi ?

[19:50:11]

stuarta:

i was looking at where the /opt/vc...libEGL was coming in, and it's clearly from the openmax stuff

[19:50:42]

stuarta:

in a vague attempt at getting it to work in pure opengl

[19:51:42]

stuarta:

given how well the experimental opengl stuff actually works on the rpi

[19:52:06]

peterbennett:

I have settings in the build that put links to the /opt/vc libraries into /usr/share/mythtv/lib and then tell the linker to use that one first

[19:52:18]

peterbennett:

That way it does not try to link to the others

[19:52:32]

stuarta:

i, ahem, worked around that for my tests ;-)

[19:52:54]

peterbennett:

Ok you will need to disable some of that

[19:53:29]

stuarta:

yeah i did

[19:53:40]

stuarta:

it's all pure speculation at this point

[19:53:54]

stuarta:

and i will have no time for the next week or so to even look at it

[19:54:03]

peterbennett:

I suppose we may be able to use experimental OpenGL for the video output and openmax for the decoding

[19:54:25]

stuarta:

in theory

[19:54:54]

peterbennett:

Unfortunately good ideas degenerate into hard work

[19:54:59]

stuarta:

hah

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stuarta:

wayland implementation = good idea and a lot of hard work

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[19:55:43]

peterbennett:

Indications are that openmax decoding was working with the experimental OpenGL but the rendering was not

[19:55:45]

stuarta:

it basically requires unpicking and understanding the entire way we handle graphics across all platforms

[19:56:14]

stuarta:

i've seen something like that, playback had just a black screen, whilst the rest of the gui seemed to work

[19:57:18]

peterbennett:

if you test with omxplayer you get the audio but see no video

[19:57:48]

stuarta:

which seems sensible, since omx isn't handling the output stage with opengl

[20:00:02]

stuarta:

old way = omx with drm

[20:00:12]

stuarta:

new way = opengl with kms

[20:01:05]

** stuarta wonders if his rpi will cope with a `make -j3` and running the frontend under gdb **

[20:02:39]

stuarta:

peterbennett: when you have time try `glmark2` under old and new ways

[20:02:39]

peterbennett:

yes I do that all the time

[20:03:12]

peterbennett:

what is glmark2?

[20:03:40]

stuarta:

i sent you the link with the details, but it's essentially an opengl benchmark

[20:04:08]

peterbennett:

So old way means without the experimental opengl?

[20:04:12]

stuarta:

yes

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[20:04:32]

peterbennett:

I am sure it is very different.

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[20:05:07]

stuarta:

the first thing it renders is a prancing horse statue, looks terrible under the old way, and perfect under the new way

[20:05:27]

stuarta:

it goes through a whole bunch of other types of images and opengl bits, and the story is the same

[20:06:56]

stuarta:

had to install a few extra libs to allow it to build, but nothing major

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[20:14:57]

stuarta:

build faster little rpi

[20:15:20]

peterbennett:

Theoretically we could build mythtv with OpenGL support for the GUI and it should just work, video playback with OpenGL profile may sort of work.

[20:16:05]

stuarta:

that's what i'm kinda trying todo

[20:17:05]

peterbennett:

If that works all we need is to separate the openmax decoding so it can be used with OpenGL rendering.

[20:17:49]

peterbennett:

I dont know what sort of deintelacing would be possible

[20:18:01]

peterbennett:

dinterlacing

[20:18:10]

peterbennett:

deinterlacing

[20:18:11]

stuarta:

i think that's the same problem we have with vaapi

[20:18:51]

stuarta:

the hardware can decode and deinterlace before giving back the frames, but our architecture as is stands doesn't allow that to be done as a single step

[20:19:14]

stuarta:

(as i understand this mess)

[20:20:05]

stuarta:

i think a good first step would be opengl display with openmax used (optionally) to decode

[20:20:25]

stuarta:

unfortunately i suspect this will require some serious surgery

[20:20:50]

** stuarta really should finish migrating things off alcor first **

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[20:28:13]

stuarta:

peterbennett: so my experiments have been directed at seeing what works when i remove the /opt/vc... EGL libs from the equation

[20:28:50]

stuarta:

current method uses openmax for audio, so as soon as i disable openmax i have no audio

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[20:37:19]

peterbennett:

you can use ALSA audio, that works better

[20:38:26]

peterbennett:

stuarta: There are several places in the code where I have disabled OpenGL for raspberry pi, to prevent people shooting themselves in the foot or prevent seg faults

[20:38:54]

stuarta:

fair enough, i've managed to break it completely now :-/

[20:39:11]

stuarta:

getting odd errors from the depths of qt

[20:41:03]

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[20:41:44]

peterbennett:

Yes I have seen my share of odd errors from the raspberry pi.

[20:42:28]

stuarta:

it'll get there

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[21:48:45]

stuarta:

it lives!

[21:49:30]

stuarta:

it = the most basic opengl triangle, using only the qt abstracted opengl

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