Vulkan: Disable debug draw modes that do not make sense depending on the current scene configuration or project settings

[Zireael07]

Godot version

4.0 alpha 1

System information

Linux Manjaro, Vulkan, Intel Kaby Lake

Issue description

There's a laundry list of special display modes on Vulkan, which is awesome <3

But I haven't been able to figure out how some of these work (e.g. directional shadows, occlusion buffer don't seem to display anything for me), and I'm fairly sure some of these don't make sense without a related property/node being in the scene you're looking at:

• all of the SDFGI modes
• all VoxelGI modes
• lightmapGI mode
• directional shadow splits if no directional light in scene
• fairly sure some more...

Please hide/make them unclickable when not relevant.

Also it would be nice to have a mode to show you which meshes are configured for GI at all, to avoid running into freezes/1fps if you happen to have GI with NO meshes set...

Steps to reproduce

Load up the editor, play around with the new options.

Minimal reproduction project

N/A

[Calinou]

Related to #55900.

directional shadows

This debug draw mode is currently broken: #46129

occlusion buffer don't seem to display anything for me

This mode only works if occlusion culling is enabled in the project settings and you have an Occluder node present in your scene.

Also it would be nice to have a mode to show you which meshes are configured for GI at all, to avoid running into freezes/1fps if you happen to have GI with NO meshes set...

We should fix the original bug instead: #36121

[Zireael07]

Fixing the bug would be nice, but it would also help people NOT click bake only to realize they forgot to set up the meshes they wanted to use with GI :P