Rounded Corners Cut Off Borders In I3

[Ap6661]

Platform

NixOS 25.05.20241217.d3c42f1 (Warbler) x86_64

GPU, drivers, and screen setup

name of display: :0
display: :0  screen: 0
direct rendering: Yes
Extended renderer info (GLX_MESA_query_renderer):
    Vendor: Intel (0x8086)
    Device: Mesa Intel(R) Graphics (RPL-P) (0xa720)
    Version: 24.2.6
    Accelerated: yes
    Video memory: 15904MB
    Unified memory: yes
    Preferred profile: core (0x1)
    Max core profile version: 4.6
    Max compat profile version: 4.6
    Max GLES1 profile version: 1.1
    Max GLES[23] profile version: 3.2
OpenGL vendor string: Intel
OpenGL renderer string: Mesa Intel(R) Graphics (RPL-P)
OpenGL core profile version string: 4.6 (Core Profile) Mesa 24.2.6
OpenGL core profile shading language version string: 4.60
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile

OpenGL version string: 4.6 (Compatibility Profile) Mesa 24.2.6
OpenGL shading language version string: 4.60
OpenGL context flags: (none)
OpenGL profile mask: compatibility profile

OpenGL ES profile version string: OpenGL ES 3.2 Mesa 24.2.6
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20

Environment

i3 version 4.24 (2024-11-06)

picom version

v12.5

Diagnostics

**Version:** v12.5

Extensions:

• Shape: Yes
• RandR: Yes
• Present: Present

Misc:

• Use Overlay: No
  (Another compositor is already running)
• Config file specified: None
• Config file used: /home/apnda/.config/picom/picom.conf

Drivers (inaccurate):

modesetting
[ 01/02/2025 13:23:17.286 egl_init WARN ] The egl backend is still experimental, use with care.

Backend: egl

• Driver vendors:
• EGL: Mesa Project
• EGL driver: iris
• GL: Intel
• GL renderer: Mesa Intel(R) Graphics (RPL-P)

Backend: glx

• Driver vendors:
• GLX: Mesa Project and SGI
• GL: Intel
• GL renderer: Mesa Intel(R) Graphics (RPL-P)
• Accelerated: 1

Configuration:

Configuration file

Steps of reproduction

1. Run i3 with borders
2. picom --config=/dev/null --backend=glx --corner-radius 20

Expected behavior

Corners with rounded insides as well as borders following the outside corner

Current Behavior

Stack trace

OpenGL trace

Other details

I believe the issue is caused by i3 doing something weird with it's borders (it allows the edges to by highlighted to show the direction of the new window)

[yshui]

awaiting upstream fix: i3/i3#4292