[bug#59451] [PATCH] gnu: cura: Make it work on wayland.

[bug#59451] [PATCH] gnu: cura: Make it work on wayland.

[Demis Balbach]

* gnu/packages/engineering.scm (cura): Make it work on wayland.
---
 gnu/packages/engineering.scm | 1 +
 1 file changed, 1 insertion(+)

diff --git a/gnu/packages/engineering.scm b/gnu/packages/engineering.scm
index 43e23e30a8..42537364e6 100644
--- a/gnu/packages/engineering.scm
+++ b/gnu/packages/engineering.scm
@@ -3780,6 +3780,7 @@ (define-public cura
            (lambda* (#:key outputs #:allow-other-keys)
              (let ((out (assoc-ref outputs "out")))
                (wrap-program (string-append out "/bin/cura")
+                 '("QT_QPA_PLATFORM" = ("xcb"))
                  (list "GUIX_PYTHONPATH"
                        'prefix (list (string-append out
                                                     "/lib/python"
-- 
2.38.1

[bug#59451] [PATCH] gnu: cura: Make it work on wayland.

[Christopher Baines]

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Demis Balbach <db@minikn.xyz> writes:

> * gnu/packages/engineering.scm (cura): Make it work on wayland.
> ---
>  gnu/packages/engineering.scm | 1 +
>  1 file changed, 1 insertion(+)
>
> diff --git a/gnu/packages/engineering.scm b/gnu/packages/engineering.scm
> index 43e23e30a8..42537364e6 100644
> --- a/gnu/packages/engineering.scm
> +++ b/gnu/packages/engineering.scm
> @@ -3780,6 +3780,7 @@ (define-public cura
>             (lambda* (#:key outputs #:allow-other-keys)
>               (let ((out (assoc-ref outputs "out")))
>                 (wrap-program (string-append out "/bin/cura")
> +                 '("QT_QPA_PLATFORM" = ("xcb"))
>                   (list "GUIX_PYTHONPATH"
>                         'prefix (list (string-append out
>                                                      "/lib/python"

Setting this environment variable here seems quite unusual. What's it
doing, and would anyone want to set a different value?

Thanks,

Chris

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[bug#59451] [PATCH] gnu: cura: Make it work on wayland.

[Demis Balbach]

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On 2022-11-23 09:20, Christopher Baines wrote:

> Setting this environment variable here seems quite unusual. What's it
> doing, and would anyone want to set a different value?
>
> Thanks,
>
> Chris

Hello Chris,

unfortunately I can't help much with this. Cura is currently not running
under Wayland (XWayland). After doing a bit of research, I found
https://github.com/Ultimaker/Cura/issues/10815, and setting
`QT_QPA_PLATFORM` to `xcb` was the suggested workaround until wayland is
officially supported.

My QT knowledge is very limited, but the QT_QPA_PLATFORM env var seems
to allow for defining platform-specific features for the application
(https://doc.qt.io/qt-6/embedded-linux.html#specifying-additional-settings).

Setting it to `xcb` enables the XCB plugin
(https://doc.qt.io/qt-6/embedded-linux.html#xcb), which seems to be the
default X11 plugin.

Setting the env var to `wayland` doesn't work unfortunately. As an
alternative, I could create a package derivation `cura-wayland` and only
apply the patch there? Would that be more suitable?

-- 
Best regards / Mit freundlichen Grüßen,
Demis Balbach

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[bug#59451] [PATCH] gnu: cura: Make it work on wayland.

[Morgan Smith]

I'm not certain but this might be related to bug 57742.  Basically cura
is a QT application that cannot access the qtwayland plugin.  We could
add this plugin to the inputs or we could fix bug 57742 and have users
install it themselves.  If I'm correct that is.  I haven't tested this
theory