[TRACKER] Vulkan Mobile backend-specific issues

[Calinou]

This issue tracks issues specific to the Vulkan (Forward) Mobile backend (such as bugs and undocumented missing features), regardless of the host platform.

See also #39033, which is specific to Android-only issues. See also #66458, which is specific to issues only present in the 4.x OpenGL renderer.

Bugs

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1. Shader per-instance uniform error spam if more than 1 mesh with that material is used in the editor #55253
   bug topic:rendering topic:shaders +3
2. Vulkan Mobile backend: LightmapGI is not sampled during rendering if a DirectionalLight3D with shadows enabled is visible #55867
   bug confirmed topic:3d topic:rendering +4
3. Vulkan Mobile backend: LightmapGI baking does not take environment lighting into account #55868
   bug confirmed topic:3d topic:rendering +4
4. Vulkan Mobile backend: Fog is only rendered on the background sky, not 3D objects #55870
   bug topic:3d topic:rendering +3
5. Vulkan Mobile backend: Environment lighting and reflections are twice as dark as they should be #55878
   bug topic:3d topic:rendering +3
6. Vulkan Mobile backend: FXAA and debanding have no effect when enabled #55879
   bug topic:3d topic:rendering +3
7. Vulkan Mobile backend: Point lights can appear brighter (duplicated) depending on the camera angle if there is more than one of the same type in view #55881
   bug confirmed topic:3d topic:rendering +4
8. Vulkan Mobile backend: Angular Distance (PCSS) does not work with DirectionalLight3D shadows #55882
   bug topic:3d topic:rendering +3
9. Vulkan Mobile backend: Lights don't affect primitive meshes #55892
   bug confirmed topic:3d topic:rendering +4
10. Vulkan Mobile backend: Some advanced debug draw modes do nothing when enabled #55900
    bug topic:3d topic:editor topic:rendering +4
11. Vulkan Mobile backend: Glow behaves inconsistently compared to the clustered backend #55901
    bug topic:3d topic:rendering +3
12. Vulkan mobile backend: Reflection Probe Ambient settings don't work #56555
    bug confirmed topic:3d topic:rendering +4
13. Vulkan Mobile backend: Radiance prefiltering worsens rough reflection quality #58631
    bug confirmed topic:3d topic:rendering +4
14. Vulkan mobile backend: 1 shaders of type BokehDofRasterShaderRD were never freed #59047
    bug topic:3d topic:rendering +3
15. Vulkan Mobile: Decal and light Cull Mask is not working #65848
    bug confirmed topic:3d topic:rendering +4
16. Vulkan Mobile: BaseMaterial3D Rim effect creates a dark dot on the mesh while moving the camera #69908
    bug confirmed topic:3d topic:rendering +4
17. Vulkan Mobile: Decals pop away when there are more than 7 decals on a mesh resource (instead of the expected 8) #70231
    bug confirmed documentation topic:3d topic:rendering +5
18. Vulkan Mobile: Decals are applied to the 3D manipulation gizmo #70774
    bug confirmed topic:3d topic:editor topic:rendering +5
19. Vulkan Mobile: DirectionalLight3D shadow opacity not working #71606
    bug topic:3d topic:rendering +3
20. Vulkan Mobile: Rendering of dark scenes with spotlight exhibits banding on plain color materials #73401
    discussion topic:3d topic:rendering +3
21. Vulkan Mobile: Point rendering casts solid shadows, as opposed to point shadows #73827
    bug topic:3d topic:rendering +3
22. Vulkan Mobile: Clip Children shows a copy of all nodes in the scene #75956
    bug confirmed topic:2d topic:rendering +4
23. Vulkan Mobile: Video memory leakage when viewport resizes with a WorldEnvironment and glow enabled #77295
    bug performance topic:3d topic:rendering +4
24. Mobile Renderer with MSAA not working when using the viewport stretch mode (presents a black screen) #67234
    bug confirmed topic:rendering +3
25. Vulkan Mobile: SpotLight and OmniLight cull masks don't cull moving meshes #82263
    bug confirmed topic:3d topic:rendering +4
26. Vulkan Mobile: LightmapGI dynamic object lighting results in black objects #84846
    bug confirmed topic:3d topic:rendering +4
27. Vulkan Mobile: LightmapGI rendering exhibits pixelation artifacts on Android #85172
    bug platform:android topic:3d topic:rendering +4
28. Shadow rendering does not respect cull mode on mobile renderer #87644
    bug topic:3d topic:rendering +3

Documentation

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1. Vulkan Mobile backend: Warn about unsupported features in the editor and class reference #55880
   documentation enhancement topic:editor topic:rendering usability +5

Enhancements

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1. Cannot use different Rendering Backends(Desktop vs Mobile) from command line #53731
   enhancement topic:rendering +2
2. GeometryInstance3D transparency does not work in mobile or compatibility renderers #76774
   enhancement topic:3d topic:rendering +3

[mrjustaguy]

Lights don't render on Mobile in github artifacts, tho work fine (with forced lambert shading) on Remi's Pre-Alphas

[Calinou]

Lights don't render on Mobile in github artifacts, tho work fine (with forced lambert shading) on Remi's Pre-Alphas

Directional and point lights seem to render fine on my end (check the issues with screenshots I created today). This is with the default settings.

[mrjustaguy]

Here I've made an issue #55892 with the current Nightly Build. I suspect GPU architectural issues if people on newer GPUs don't have this issue.

[SimplyPhy]

Should this [and #39033] be with Milestone 4.0? Or perhaps 4.1.

[Calinou]

Should this [and #39033] be with Milestone 4.0? Or perhaps 4.1.

I added milestone 4.0. However, I can't promise that all Vulkan mobile rendering bugs will be fixed for 4.0 – some of those will have to wait for 4.1.