That does look like a bracket-lib issue. I’ve opened an issue there ( https://github.com/thebracket/bracket-lib/issues/184 ), and I’ll see what I can do. I don’t have a current-gen Pi to test on, hopefully I can figure it out. If I had to guess, it’s a resolution/smoothing issue (you sometimes get rounding errors with GL coordinates, it normalizes everything from 0.0 to 1.0 internally).

Thanks!

Have found out some more information. I am running xrdp on my pi and connecting from my Mac using Microsoft Remote Desktop Beta. I decided to see if I got the same on the pi directly connected via a monitor. Interestingly, dugeoncrawl doesn’t run - it gives the error:

0:1(10): error: GLSL 3.30 is not supported. Supported versions are: 1.10, 1.20, 1.00 ES, and 3.00 ES

However, if I change the command to:

MESA_GL_VERSION_OVERRIDE=3.0 MESA_GLSL_VERSION_OVERRIDE=330 target/release/dungeoncrawl

It runs and the line doesn’t appear i.e. all is good

So the problem only occurs when connected remotely.

Andrew