[wpe-webkit] AArch64 builds in AUR

Adrian Perez de Castro aperez at igalia.com
Tue Mar 12 02:37:04 PDT 2019


Hello Andrea!

On Wed, 6 Mar 2019 23:33:04 +0100, Andrea Giammarchi <andrea.giammarchi at gmail.com> wrote:

> Quick update.
> 
> I've killed the crickets myself and moved forward
> https://archlinuxarm.org/forum/viewtopic.php?f=65&t=13469#p60732
> 
> I have 16GB DDR4 through 6 cores + HT AMD Ryzen taking care of building
> aarch64 via qemu-aarch-static and it seems like it's almost done (2428 out
> of 2698)
> 
> It's taking a couple of hours so that's OK, but honestly I think it's
> impossible to build this on an RPi3.
> 
> However, since I'm emulating aarch64 right away, it'd be great if you could
> flag wpewebkit target architecture for aarch64 too, so I can simply use AUR
> for everything.
> 
> The gotcha with arch-chrooting into aarch64 from x86_64 is that `sudo`,
> which is kinda mandatory for any package operation, doesn't work due
> numerous issues, so that I have to build Yaourt from scratch manually and
> hope it'll manage to handle all packages (as it usually does even if not
> maintained anymore).
> 
> *TL;DR* with my PC simulating aarch64 on a Raspberry Pi 3 image, I'm
> confident we can deliver a pre-built wpewebkit to ArchLinuxARM via AUR 🎉

Good find! Somehow it didn't cross my mind to do the whole build process using
qemu's user space emulation, and of course that allows using a bigger machine
to build things would still be “fast enough” as long as there is RAM enough
for the linker. I should have thought of this, thanks for sharing!

> Now, back to the issues I've faced already:
> 
>    1. I cannot enable canvas indeed, 'cause cairo-gl is missing. By any
>    chance we understand how Sam Decrock managed to enabled that
>    <https://medium.com/@decrocksam/building-wpe-webkit-for-raspberry-pi-3-cdbd7b5cb362>?

I don't see anything in the article, but if you really want to try enabling
the 2D canvas acceleration, you just need to change the command that invokes
CMake in the PKGBUILD and add “-DENABLE_ACCELERATED_2D_CANVAS=ON” to it.

But beware: the PKGBUILD for Cairo in Arch Linux ARM is currently *disabling*
the OpenGL support, which is needed. See:

   https://archlinuxarm.org/packages/aarch64/cairo/files/PKGBUILD

This means that you will need to modify the PKGBUILD and build Cairo first
passing “--enable-gl” to its configuration script. A good option would be to
have a separate package named “cairo-gl” which has “provides=(cairo)” and
“conflicts=(cairo)” in its PKGBUILD.

>    2. is it OK for Igalia if I publish in AUR a pre built binary and
>    maintain it? It means I need some ping, from time to time, when things
>    change

Of course! That is no problem at all. It is actually real nice to see people
from the different communities step up and get things done with WPE WebKit :)

>    3. why wpebackend-fdo-git needs wpebackend-git,  but wpebackend-fdo doesn't
>    ? anything special I should consider if I ever land such package in AUR?

Ouch, that dependency in “wpebackend-fdo-git” was wrong because it should be
“libwpe-git” — good catch. I have pushed an update to fix this.

> Thanks for your help, patience, and possible outcome 👋

Happy to help — and thanks for your patience waiting for me to reply e-mails.

Best regards,


-Adrián


> On Wed, Mar 6, 2019 at 1:44 PM Andrea Giammarchi <
> andrea.giammarchi at gmail.com> wrote:
> 
> > Unless the direct backend is notably faster, I think I'm fine with
> > Wayland, also because I believe you need some compositor when you open, as
> > example, the files explorer, so GTK on Weston would be just fine, right?
> >
> > Last question about the canvas:
> >
> > > Note that even with ENABLE_ACCELERATED_2D_CANVAS disabled, WebGL is
> > always rendered by the GPU.
> >
> > One of the demo used in the WPE on Pi post benchmarks the canvas
> > https://smashcat.org/av/canvas_test/ and I've seen it with my eyes it's
> > indeed blazing fast compared to the regular canvas. I don't think it uses
> > WebGL though, so I wonder if I am missing anything.
> >
> > So, how would I force-enable that ?
> >
> >
> >
> > On Wed, Mar 6, 2019 at 1:30 PM Adrian Perez de Castro <aperez at igalia.com>
> > wrote:
> >
> >> Hello Andrea,
> >>
> >> On Wed, 6 Mar 2019 12:38:54 +0100, Andrea Giammarchi <
> >> andrea.giammarchi at gmail.com> wrote:
> >>
> >> > Crickets so far ... btw, I'm going skiing for the Weekend so I'll try to
> >> > build WPE directly on the Pi.
> >> >
> >> > Everything seems to work fine except ENABLE_ACCELERATED_2D_CANVAS AND
> >> > ENABLE_ENCRYPTED_MEDIA are both OFF, while all others are ON.
> >> >
> >> > I am interested specially in the ENABLE_ACCELERATED_2D_CANVAS, why
> >> wouldn't
> >> > that work?
> >>
> >> ENABLE_ACCELERATED_2D_CANVAS is disabled by default because it uses
> >> Cairo-GL,
> >> which does not really work as well as you may imagine, and can be slower
> >> in
> >> some cases depending on many factors (including, but not limited to, the
> >> GPU
> >> being used). YMMV.
> >>
> >> Note that even with ENABLE_ACCELERATED_2D_CANVAS disabled, WebGL is always
> >> rendered by the GPU.
> >>
> >> > Also I have another question: is wpebackend preferred over
> >> wpebackend-fdo ?
> >> > Latter seems for Wayland, which I'm OK with, but not sure it performs
> >> any
> >> > better than the former.
> >>
> >> The “wpebackend” package is deprecated and has been replaced by “libwpe”
> >> (the name was confusing, because “wpebackend” was not a backend: it was
> >> just a library used to implement and use backends).
> >>
> >> An alternative WPE backend that works for the Raspberry Pi is the RDK
> >> backend
> >> [1] when built passing “-DUSE_BACKEND_BCM_RPI=ON” to CMake.
> >>
> >> Note that I have not been using the RDK backend myself so I cannot
> >> comment on
> >> its status, and that's the reason why I have not submitted an AUR package
> >> for
> >> it — but should work, with the advantage that a Wayland compositor is not
> >> needed, but with the limitations that only one Web view can be created,
> >> and
> >> that it uses the 32-bit Raspberry Pi userland libraries (which cannot be
> >> built
> >> in 64-bit mode [2]).
> >>
> >> > Thanks again for extra clarifications.
> >>
> >> Happy to help :)
> >>
> >> -Adrián
> >>
> >> ---
> >> [1] https://github.com/WebPlatformForEmbedded/WPEBackend-rdk
> >> [2] https://github.com/raspberrypi/userland/issues/314
> >>
> >
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