Mipmap bias slider in the project settings no longer has any effect

[LiveTrower]

Godot version

v4.2.dev.custom_build [549fcce]

System information

Windows 10, Vulkan, GTX 960 537.13

Issue description

2023-08-31.18-51-53.mp4

Steps to reproduce

I think the video shows enough.

Minimal reproduction project

N/A

[Calinou]

This checks out with what I reported while testing FSR 2. That PR may have fixed the issue, I haven't checked yet.

[LiveTrower]

@Calinou I specifically realized it while testing that PR.
Godot FSR 2.2 Scaling 33%

Unreal FSR 2.2 Scaling 33%

[Calinou]

It almost looks like positive mipmap LOD bias is being applied instead of negative LOD bias.

[DarioSamo]

I get the feeling it's not exactly a positive bias but rather it's not really doing anything.

I'll verify what sampler it's retrieving exactly for rendering.

[AThousandShips]

Does it work after a restart?

Note: This property is only read when the project starts. To change the mipmap LOD bias at run-time, set Viewport.texture_mipmap_bias instead.

[DarioSamo]

RenderDoc shows it's just picking the sampler with no mipmap bias.

The problem is the renderer picks the uniform bindings of the default samplers that have no bias applied.

There's a custom set shared with other things, but frankly that design seems prone to problems as the viewports can't apply their own mipmap bias individually.

Perhaps material storage should be able to create samplers on demand with the bias required by the renderer.