Bug 427856

Summary:	Enable build with OpenGL ES-only systems (mainly ARM)
Product:	[Applications] krita	Reporter:	Alvin Wong <alvin>
Component:	General	Assignee:	Krita Bugs <krita-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	polypa
Priority:	NOR
Version:	git master (please specify the git hash!)
Target Milestone:	---
Platform:	unspecified
OS:	Linux
Latest Commit:		Version Fixed In:

Description Alvin Wong 2020-10-17 10:03:53 UTC

After a bit of help on IRC, `wrn` was able to build Krita from source for
Raspberry Pi 4 after some changes to the source. They also posted their
experience [1]. It would be nice if Krita can fix its build issues and
re-enable the flatpak arm/aarch64 builds and other distro packages.

I also have a few extra notes and questions:

- Do *not* assume that ARM only has OpenGL ES available. Incidentally, Debian
  on Aarch64 builds Qt with desktop OpenGL support (see also QTBUG-72128 [2]
  and the mailing list thread linked in the comments). Therefore, any checks
  should rely on Qt's defines and not the target ARCH.
- Why would Krita need to set `QT_OPENGL_ES_3` (also related to Android)?
  Surely it is supposed to be set by Qt as part of its configure option/checks?
- Can we eliminate the need of its `HAS_ONLY_OPENGL_ES` define and just rely
  on Qt's defines? From what I gathered if `QT_OPENGL_ES` is defined that means
  the Qt build is configured for OpenGL ES only (dynamic OpenGL, i.e. ANGLE,
  should not have it defined).
- OCIO needs OpenGL, but I thought it can also be used with OpenGL ES
  (otherwise it wouldn't work with ANGLE)?

[1]: https://www.raspberrypi.org/forums/viewtopic.php?f=38&t=288461
[2]: https://bugreports.qt.io/browse/QTBUG-72128

Comment 1 Patrice Poly 2020-10-17 10:46:44 UTC

Hello I am 'wrn' on freenode -
I just tested to rebuild without

 add_definitions(-DQT_OPENGL_ES_3) in libs/ui/CMakeLists.txt

It builds and runs fine , so that was not needed.

I will be very happy to help with testing if anyone picks this up.

Comment 2 Alvin Wong 2021-03-12 12:52:36 UTC

Looks like this is actually a duplicate of bug 421136 so I'm marking it as such.

*** This bug has been marked as a duplicate of bug 421136 ***