Created attachment 392299 [details]
log of build failure
I've been trying to build epiphany 3.35.92 (latest unstable release as of this posting) and to test out webkit's "Accelerated 2D Canvas". epiphany gives the minimum required version of "webkit2gtk-4.0" as "2.27.4", so that is the version I have been attempting to build (in order to use it to build epiphany).
Since I'm using Archlinux, prerequisite to enabling the accelerated 2d canvas was building a custom cairo with the cairo-gl backend enabled, which I have done using cairo 1.17.2+17+g52a7c79fd
I had successfully built webkit2gtk 2.27.3 against the same cairo previously, to build epiphany 3.35.3; at that time it was not necessary to explicitly enable the accelerated 2d canvas feature at build time: webkit detected the presence of cairo and the cairo-gl module, and enabled it automatically.
When building 2.27.4 against the same cairo package, I noticed at first that the 2d accelerated canvas is _not_ automatically enabled; nor does configure attempt to find the cairo-gl module.
Specifying -DENABLE__ACCELERATED_2D_CANVAS=ON at build time to explicitly enable the feature seems to work, but then build fails around 76~77%.
See attached output for log of build failure.
(In reply to Que Quotion from comment #0)
> Created attachment 392299 [details]
> log of build failure
> I've been trying to build epiphany 3.35.92 (latest unstable release as of
> this posting) and to test out webkit's "Accelerated 2D Canvas". epiphany
> gives the minimum required version of "webkit2gtk-4.0" as "2.27.4", so that
> is the version I have been attempting to build (in order to use it to build
I have just checked an “trunk” also has trouble building with the option
enabled. There are also a couple of build issues with non-unified builds.
All in all it looks like none of us working on WebKit has tried doing a
build with ENABLE_ACCELERATED_2D_CANVAS=ON, but it should work even if it
is not the default — I'll take a stab at unbreaking it.
> Since I'm using Archlinux, prerequisite to enabling the accelerated 2d
> canvas was building a custom cairo with the cairo-gl backend enabled, which
> I have done using cairo 1.17.2+17+g52a7c79fd
I use Arch Linux myself, so thanks for pointing out that the Cairo package
does not have GL support enabled, this has saved me some time trying to
figure out why the WebKit build would fail configuration :]
> I had successfully built webkit2gtk 2.27.3 against the same cairo
> previously, to build epiphany 3.35.3; at that time it was not necessary to
> explicitly enable the accelerated 2d canvas feature at build time: webkit
> detected the presence of cairo and the cairo-gl module, and enabled it
> When building 2.27.4 against the same cairo package, I noticed at first that
> the 2d accelerated canvas is _not_ automatically enabled; nor does configure
> attempt to find the cairo-gl module.
Dunno what might have changed… Anyway, in general we prefer to avoid
automatically detecting which features to enable depending on what is
installed at build time: specifying them explicitly is more robust also
for packagers so I will *not* be trying to bring autodetection back.
> Specifying -DENABLE_ACCELERATED_2D_CANVAS=ON at build time to explicitly
> enable the feature seems to work, but then build fails around 76~77%.
> See attached output for log of build failure.
Thanks for the detailed bug report!
Created attachment 394163 [details]
Enable use of EGL/OpenGL(core 4.2) for GTK/WPE builds
I've made a patch which enables this to work by using OpenGL4 instead of GLES2 with EGL.
My intention was to get WebGL2 working, but I didn't manage to successfully debug it.
Requires -DWL_EGL_PLATFORM=1 -DUSE_OPENGL=1 -DHAVE_OPENGL_4=1 -DUSE_OPENGL_ES=0 to be set.
WebKitGTK 2.28.0 (tarball)
Linux 5.6.0-rc6-00016-g8cf00335c050 #18 SMP PREEMPT Thu Mar 19 08:38:16 GMT 2020 x86_64
1.16.0 (build) 1.16.0 (runtime)
1.16.2 (build) GStreamer 1.16.2 (runtime)
3.24.14 (build) 3.24.14 (runtime)
1.4.0 (using fdo backend 1.4.0)
Screen work area
Bits per color component
Hardware Acceleration Information
Mesa DRI Intel(R) HD Graphics 4000 (IVB GT2)
Intel Open Source Technology Center
4.2 (Core Profile) Mesa 20.1.0-devel (git-d60375cbc2)
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This build option is removed in bug #217603, so probably better to not use it.
(In reply to Michael Catanzaro from comment #5)
> This build option is removed in bug #217603, so probably better to not use
For the record, we fixed the build in bug #217384 and backported the fix
to the 2.30.x branch. The rationale is that 2.30.0 and 2.30.1 are already
published with the option available, so it's desirable to have a fix for
the release branch (2.30.2 will include it) — so at the moment it's possible
to build both trunk and the 2.30.x branch with the option.
While fixing things, we discussed a bit about the future for this option,
and decided that it could be a good idea to remove it: it's never built
nor tested by default, therefore it tends to break and bitrot; and while
in some cases it gives marginal rendering performance improvements, in
many situations it makes things worse. The latter is why it's not enabled
*** This bug has been marked as a duplicate of bug 217603 ***
*** This bug has been marked as a duplicate of bug 217384 ***
(In reply to Adrian Perez from comment #6)
> For the record, we fixed the build in bug #217384 and backported the fix
> to the 2.30.x branch.
Hm, there's also bug #216602 (which I didn't close, maybe should?).
(In reply to Michael Catanzaro from comment #9)
> (In reply to Adrian Perez from comment #6)
> > For the record, we fixed the build in bug #217384 and backported the fix
> > to the 2.30.x branch.
> Hm, there's also bug #216602 (which I didn't close, maybe should?).
I closed it as well, thanks for pointing me to it; somehow I managed
to miss it back when it was filed 😓️