Cannot use different Rendering Backends(Desktop vs Mobile) from command line

[qarmin]

Godot version

4.0

System information

Ubuntu 21.04 - Nvidia GTX 970, Gnome shell 3.38 X11

Issue description

Currently I cannot use one time Mobile and other time Desktop Vulkan backend by just changing command line options.
I need to set this in project settings manually.

Not sure, but --rendering-driver seems to be proper option, but it is unimplemented

[Calinou]

Not sure, but --rendering-driver seems to be proper option, but it is unimplemented

#53150 implements it, but Vulkan still only has one vulkan option there.

I presume we'll have to add a distinction between vulkan_clustered, vulkan_mobile and perhaps vulkan (use the project-defined setting, defaulting to vulkan_clustered on desktop and vulkan_mobile on mobile).

Alternatively, we should add a --set command line argument to set any project setting before the editor or project starts: --set some/project/setting "value"

[Anutrix]

Alternatively, we should add a --set command line argument to set any project setting before the editor or project starts: --set some/project/setting "value"

Sounds good but --set-setting might be more clear than --set.

Also, how to differentiate between project and editor settings?
A. Add them separately: --set-project-setting and --set-editor-setting.
or
B. First we check if it's a project setting with ProjectSettings::has_setting and then EditorSettings::has_setting if it's not a project setting.
Either or both options seem good to me,

[Calinou]

This is fully fixed now in 4.2 and later (4.0-4.1 had some issues with --rendering-method not reliably working for toggling between Forward+ and Mobile):

• --rendering-driver vulkan|d3d12|opengl3|opengl3_es|opengl3_angle
• --rendering-method forward_plus|mobile|gl_compatibility