GDS3D crashes

[ihagg]

Describe the bug
GDS3D crashes at launch.

To Reproduce
Steps to reproduce the behavior:

1. GDS3D -p /foss/pdks/sky130A/libs.tech/gds3d/gds3d_tech.txt -i magic_gds_write.gds
2. See error

Expected behavior
Open GDS3D with no errors.

Screenshots
Error message:
No matching fbConfigs or visuals found
glx: failed to create drisw screen
X Error of failed request: GLXBadContext
Major opcode of failed request: 149 (GLX)
Minor opcode of failed request: 5 (X_GLXMakeCurrent)
Serial number of failed request: 40
Current serial number in output stream: 40

Environment:

• OS: macOS
• Operating mode: X11 (XQuartz)
• Version tag: 2025.12

Additional context
GDS3D used to work for me in previous version tags.
I have no problems with other tools, for example Magic and Xschem open properly.

[MrHighVoltage]

Hi!

I'm not too sure about XQuartz, but can you check if GLX / iglx is enabled correctly?

Further, please follow https://github.com/iic-jku/IIC-OSIC-TOOLS/blob/main/KNOWN_ISSUES.md#issues-with-opengl-on-some-environments and disable indirect rednering, which is used on MacOS per default.

[hpretl]

I can confirm the fail on my Mac:

X Error of failed request:  GLXBadContext
  Major opcode of failed request:  149 (GLX)
  Minor opcode of failed request:  5 (X_GLXMakeCurrent)
  Serial number of failed request:  28
  Current serial number in output stream:  28

The topic is that XQuartz and GDS3D have both not been updated in a long time. I expect an issue with one of the system libs, either in the base Ubuntu Linux, or on the Mac itself. I do not see how to fix or debug this, so I will close for now, but I have added it to KNOWN_ISSUES.md. See a530cf9.

[MrHighVoltage]

Does it work by using software rendering? The trick should be done by putting LIBGL_ALWAYS_INDIRECT=0 before the commandline of GDS3D.

[hpretl]

I tried it, no difference.