RFR: 8329820: [Linux] Prefer EGL over GLX [v14]

[Thiago Milczarek Sayao]

On Sun, 9 Jun 2024 13:12:44 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> Wayland implementation will require EGL. 
>> 
>> EGL works with Xorg as well. The idea is to be EGL first and if it fails, fallback to GLX. A force flag `prism.es2.forceGLX=true` is available.
>> 
>> 
>> See:
>> [Switching the Linux graphics stack from GLX to EGL](https://mozillagfx.wordpress.com/2021/10/30/switching-the-linux-graphics-stack-from-glx-to-egl/)
>> [Prefer EGL to GLX for the GL support on X11](https://gitlab.gnome.org/GNOME/gtk/-/merge_requests/3540)
>
> Thiago Milczarek Sayao has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains ten commits:
> 
>  - Merge branch 'refs/heads/master' into egl
>  - Merge branch 'refs/heads/master' into egl
>  - Merge branch 'refs/heads/master' into egl
>  - Use prismES2EGLX11 as build name
>  - Merge branch 'master' into egl
>  - Prefer EGL over GLX
>  - Merge branch 'master' into egl
>  - Merge branch 'master' into egl
>    
>    # Conflicts:
>    #	modules/javafx.graphics/src/main/native-prism-es2/x11/X11GLContext.c
>  - Use EGL instead of GLX

Would it be better to still default to GLX and have a flag to use EGL (and switch within a few releases), or to go with EGL and have a flag to fallback to GLX?

Currently (on this PR) it defaults to EGL first, and if it fails, try GLX (I don't know a scenario where EGL won't work, on Xorg o XWayland).

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PR Comment: https://git.openjdk.org/jfx/pull/1381#issuecomment-2214100176