RFR: 8329820: [Linux] Prefer EGL over GLX [v8]

[Thiago Milczarek Sayao]

On Tue, 30 Apr 2024 20:03:18 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 incrementally with four additional commits since the last revision:
> 
>  - Rollback file
>  - rollback file
>  - - Rollback EGL_DEFAULT_DISPLAY
>    - Don't trust eglGetDisplay without platform
>    - Rollback Use PBuffer as the dummy surface
>  - Revert "- Use EGL_DEFAULT_DISPLAY"
>    
>    This reverts commit 0c78b7490aae221b8441028323bdfa7803e6252e.

I changed it to use platform specific way to get `EGLDisplay` so `eglGetDisplay` does not have to guess the platform (it can guess wrong).

It can be seen by setting `EGL_LOG_LEVEL=debug` (with `eglGetDisplay` it will output the guessing part).

I also reverted the Dummy window code change.

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PR Comment: https://git.openjdk.org/jfx/pull/1381#issuecomment-2087018281