Black Flickering on Editor Axes

[Qainguin]

Tested versions

• Reproducible in 4.2.2
• Not Reproducible in 4.2.1

System information

Godot v4.2.2.stable - macOS 14.1.1 - GLES3 (Compatibility) - Apple M1 - Apple M1 (8 Threads)

Issue description

Certain actions (right-clicking, creating new resources in exports and adding nodes) cause the axes in the editor to flicker black.

Steps to reproduce

• Create a new project
• Right-click on a node.

Minimal reproduction project (MRP)

N/A

[akien-mga]

For me on Linux it doesn't seem to flicker black on specific actions, it's outright invisible:

I confirm it's not a problem in 4.2.1, so this regressed in 4.2.2. CC @clayjohn

[akien-mga]

It's a regression from 771db18 / #83895.
Reverting it locally solves the issue (also requires reverting 9547818 first as it modified it further).

I don't have the same problem in master though, so we might be missing another commit, or the cherry-pick was just not suitable for 4.2. CC @clayjohn

For the record, this is on Linux with AMD GPU.

Related to this change, there's also a weird rendering artifact where the 3D lines appear bigger at first when loading the project, then get slimmer.

This is in 4.3-dev (a4fbe4c):

In 4.2.2:

In 4.2.1:


(no difference of line width)

[clayjohn]

@akien-mga Hmmm, I've seen the disappearing grid line issue before. Its very strange that the grid lines and the origin lines are disappearing as they use a totally different method for drawing. I suspect its an issue with our mesh compression code that was fixed in 4.3. Also note, the OP is using the compatibility renderer while you are using the Forward+ renderer.

Can you test changing this line to use fwidthFine() instead?

godot/editor/plugins/node_3d_editor_plugin.cpp

Line 6576 in 4bca2d8

float line_width = fwidth(UV.x * 0.5);

I think many AMD devices default to using Coarse if nothing is specified, which could explain your issue.

As for the OP. I can reproduce the flickering black issue on macOS using the compatibility renderer in both 4.2.2 and 4.3 dev 5. So these are definitely different issues