Vulkan: Volumetric fog glitches out in builds that use optimize=none, but not other optimization levels

[Calinou]

Godot version

4.0.2.stable (compiled from source)

System information

Fedora 37, GeForce RTX 4090 (NVIDIA 530.41.03)

Issue description

Volumetric fog glitches out with NaN/INF values depending on the compiler optimization level:

Glow disabled	Glow enabled

This occurs regardless of whether SDFGI or VoxelGI or any other effects (glow, SSR, SSAO, SSIL) is used.

• optimize=speed, optimize=speed_trace, optimize=debug and optimize=size work as expected.
• optimize=none causes the glitch.

I'm using GCC 12.2.1 from the Fedora 37 repositories.

Edit: I've tried reproducing this again with optimize=none and can't reproduce this anymore, even if I clean all SCons files and rebuild. However, when I could reproduce the issue, I could always reproduce it with a binary using optimize=none and never with a binary using optimize=speed.

Steps to reproduce

• Use a self-compiled build on Linux with optimize=none (GCC, not tested with Clang).
• Open the Reflection project linked below in the editor and move the 3D camera around. Fog will eventually glitch out.

Minimal reproduction project

I haven't managed to reproduce this issue in a minimal project so far, only in https://github.com/Calinou/godot-reflection.

[akien-mga]

For the record, I've had it glitch making the whole screen black on 4.0.2.official builds on both Linux and Windows. Might not be the same bug, but at least mine wouldn't be compiler/optimization related. I should be able to provided a (non minimal) reproduction project soon.