Bug 443660

Summary: No effects while running gzdoom
Product: [Plasma] kwin Reporter: Peter Shkenev <mustela>
Component: effects-variousAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED NOT A BUG    
Severity: normal    
Priority: NOR    
Version First Reported In: unspecified   
Target Milestone: ---   
Platform: Kubuntu   
OS: Linux   
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Peter Shkenev 2021-10-13 09:52:18 UTC 
SUMMARY
While I'm playing doom, no effects like shadows and animations are rendered

STEPS TO REPRODUCE
1. Run GZDoom
2. Observe bug

OBSERVED RESULT
See summary

EXPECTED RESULT
All effects are rendered properly

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Kubuntu 21.04
KDE Plasma Version: 5.21.4 (X11)
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
Using NVIDIA GeForce GTX 660 gpu, bug observed with both nouveau and propietary nvidia driver.
Comment 1 Vlad Zahorodnii 2021-10-13 11:58:00 UTC 
Video games usually block compositing, which disables drop shadows drawn by kwin. You can force compositing in the compositor settings by unchecking "Allow applications to block compositing", but it can worsen performance.

This issue is not present on Wayland, but since you have an NVIDIA GPU, you're going to encounter other issues.