[PROJECTM ISSUE] Some presets look bad on high-dpi display

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

2.0-linux-pre2

Operating System

Linux (Desktop)

Additional Application Details

https://github.com/kblaschke/frontend-sdl2/releases/download/2.0-linux-pre2/projectMSDL-2.0.0-Linux-x86_64.deb

Type of Defect

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

Log Output

Describe the Issue

My system runs Xorg. I have a high-dpi display with a resolution of 3840x2160 px and 288 dpi (3x scaling). Some presets look really bad because graphical elements like thin lines are rendered too thin.

Butterchurn seems to account for the system dpi and scale pixel values accordingly (or the scaling might be done by the browser?). Here's a screenshot pf projectM and Butterchurn running side-by-side with the same preset demonstrating the difference:

Start by inspecting the projectM Standalone SDL2 Frontend's display and rendering setup on Linux/Xorg, then reproduce the issue at 3840x2160 and 288 dpi with a preset that shows thin lines. Done means the affected presets render graphical elements with appropriate high-DPI scaling without degrading normal displays.