DEPTH_TEXTURE broken on mobile GLES 3

[victfv]

Godot version

3.5 beta 5

System information

Android 12, Adreno 640

Issue description

When I exported a project using GLES 3, proximity fade materials vanished. I converted the spatial material to a shader material and set it to display the DEPTH_TEXTURE and it's is pure black. Depth texture seems correct on GLES 2, but it's precision is too low to be usable in large meshes.

On PC it look like this:

On mobile it look like this

PC with GLES 2:

Mobile with GLES 2:

Steps to reproduce

• Add any mesh to a scene.
• Add a spatial material with proximity fade to the mesh.
• Export to mobile using GLES 3 renderer.

Minimal reproduction project

ProximityFadeIssue.zip

[Calinou]

Depth texture seems correct on GLES 2, but it's precision is too low to be usable in large meshes.

You can force high shader precision in the Project Settings (Enable High Float.Android). This has a significant GPU performance cost though.

See also #54431.