Godot produces a black screen and spams errors when a VRS mode is set

[funkysandwich]

Tested versions

• Tested in 4.5.dev5 with mono [64b0990]

System information

Windows 11 - Godot 4.5.dev5 with mono - Vulkan (Foward+) - AMD Radeon RX 7800XT

Issue description

When launching the game with a VRS mode set in project settings, the renderer produces a black screen, and spams the console with errors.

Also the black screen persists if the mode is set to XR, and even when launching with --xr-mode off

Steps to reproduce

1. Create a new project.
2. Go to project settings.
3. Find Rendering/VRS and set mode to anything other than None.
4. Run the project.

Minimal reproduction project (MRP)

blackscreenmrp_2025-06-05_16-35-40.zip

[Calinou]

I can't reproduce this on 4.5.dev4 (Linux + NVIDIA).

[akien-mga]

@funkysandwich Can you reproduce this on earlier versions of Godot? Like 4.4.1-stable and previous 4.5 dev snapshots?

[funkysandwich]

@funkysandwich Can you reproduce this on earlier versions of Godot? Like 4.4.1-stable and previous 4.5 dev snapshots?

I did some more testing, and I was able to reproduce the black screen in:

• 4.5.dev4
• 4.5.dev3
• 4.5.dev2

But not within 4.5.dev1

I ran into this bug after opening a copy of an existing project I started in Godot 4.4.1 with 4.5.dev5.
It is a VR project with VRS mode set to XR.

[dsnopek]

Just given the timeline, this could be related to PR #99551 which was merged between 4.5-dev1 and dev2, and affects the VRS code