[APP BUG] Problem with preset, visual artifacts while projectM 3.1.12 works fine

[sluedecke]

Please confirm the following points:

• This report is NOT about the Android apps in the Play Store
• I have searched the project page to check if the issue was already reported

Affected Application

projectM Standalone SDL2 Frontend (includes the Steam app)

Affected Version

git version 7a07229

Operating System

Linux (Desktop)

Additional Application Details

Using the application from the Arch Linux repository.

Git version: https://aur.archlinux.org/packages/projectm-sdl2-git

3.1.12 version: https://archlinux.org/packages/extra/x86_64/projectm-sdl/

Type of Defect

Graphical issue (rendering glitches, black screen, heavy flickering)

Log Output

SDL_AUDIODRIVER=pulse  projectMSDL -p Stahlregen\ -\ digitally\ frosted.milk 
Trying to load configuration from /usr/projectMSDL.properties.
2026-01-26T03:25:50Z Events enabled: 1
2026-01-26T03:25:50Z Recording audio from device "Default capturing device" (ID -1).
2026-01-26T03:25:50Z Opened audio recording device "System default capturing device" (ID -1) with 2 channels at 44100 Hz.
2026-01-26T03:25:50Z Displaying preset: Stahlregen - digitally frosted.milk

Describe the Issue

I make use of the preset "Stahlregen - digitally frosted" /usr/share/projectM/presets/cream-of-the-crop/Waveform/Wire Flat/Stahlregen - digitally frosted.milk and it is displayed differently to version 3. I am not sure where to best report it, so I start with the frontend I use. Hope that is ok.

I total silence, projectMSDL 3.1.12 displays an empty window with this preset. The last version of the frontend shows this:

the artifacts seen propagate slowly to the top right of the window. They keep coming once I start an audio source and keep being seen. Having a look at the preset, it seems to be related to the warp entries, because once removed the artifacts are gone. But the decaying particles are too ...