Run on discrete GPU, if available

[wjt]

On systems where a more powerful secondary GPU is available, this key causes GNOME, KDE, and possibly other desktops to launch the app (by default) with an appropriate set of environment variables to use that GPU. The assumption is that, as a gaming tool, Unity users probably want to use a discrete GPU if available.

Unity Hub itself probably won't care either way, but the Unity editor it spawns will, as will the games spawned by that editor.

https://specifications.freedesktop.org/desktop-entry-spec/desktop-entry-spec-latest.html#key-prefersnondefaultgpu

[flathubbot]

Started test build 23770

[wjt]

completely, 100% untested!

[flathubbot]

Build 23770 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/6415/com.unity.UnityHub.flatpakref

[flathubbot]

Started test build 26301

[flathubbot]

Build 26301 successful To test this build, install it from the testing repository:

flatpak install --user https://dl.flathub.org/build-repo/8962/com.unity.UnityHub.flatpakref

[wjt]

I still haven't actually tested this but it's exactly the same bytes as are present in com.valvesoftware.Steam.desktop so I can't see how it can be wrong :)

[cassidyjames]

Having tested this on Endless OS 5, I can confirm GNOME launches it on the discrete graphics with this PR, including the Unity editor itself and e.g. the included LEGO demo project works great.

Master defaults to the integrated graphics which makes the LEGO demo project crash upon starting.