Bug#1034689: gl-117: Moving mouse creates lag (workaround: use software rendering)

[Nils Dagsson Moskopp]

Package: gl-117
Version: 1.3.2-3+b1
Severity: important
X-Debbugs-Cc: nils+deb...@dieweltistgarnichtso.net

Dear Maintainer,

I installed and started gl-117 just now. It showed severe lag.
There was a warning shown about the rendering being too slow …

I managed to disable fullscreen mode and quit the application and started it again.
I found that lag only happens when the mouse cursor moves inside the gl-117 window.

Using Mesa software rendering with “LIBGL_ALWAYS_SOFTWARE=1 gl-117” avoids the lag.
Here is the terminal output of “glxinfo |grep -i ' version'” on the machine I used:

server glx version string: 1.4
client glx version string: 1.4
GLX version: 1.4
Version: 20.3.5
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 core profile version string: 4.6 (Core Profile) Mesa 20.3.5
OpenGL core profile shading language version string: 4.60
OpenGL version string: 4.6 (Compatibility Profile) Mesa 20.3.5
OpenGL shading language version string: 4.60
OpenGL ES profile version string: OpenGL ES 3.2 Mesa 20.3.5
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.20

-- System Information:
Debian Release: 11.6
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 5.15.0-0.bpo.3-amd64 (SMP w/16 CPU threads)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gl-117 depends on:
ii freeglut3 2.8.1-6
ii gl-117-data 1.3.2-3
ii libc6 2.31-13+deb11u5
ii libgcc-s1 [libgcc1] 10.2.1-6
ii libgl1 1.3.2-1
ii libgl1-mesa-glx 20.3.5-1
ii libglu1-mesa [libglu1] 9.0.1-1
ii libsdl-mixer1.2 1.2.12-16+b1
ii libsdl1.2debian 1.2.15+dfsg2-6
ii libstdc++6 10.2.1-6

gl-117 recommends no packages.

gl-117 suggests no packages.

-- no debconf information

[Nils Dagsson Moskopp]

Package: gl-117
Version: 1.3.2-3+b1
Followup-For: Bug #1034689
X-Debbugs-Cc: nils+debia...@dieweltistgarnichtso.net

Dear Maintainer,

I tested gl-117 on a Thinkpad T60 and found the lag does not to occur on it;
I actually did get 60 fps almost consistently, sometimes dropping to 45 fps.

I have no idea what could make gl-117 work so much worse on newer hardware …

Here is the terminal output of “glxinfo |grep -i ' version'” on that laptop:

server glx version string: 1.4
client glx version string: 1.4
GLX version: 1.4
Version: 20.3.5

Max core profile version: 0.0
Max compat profile version: 1.4

Max GLES1 profile version: 1.1

Max GLES[23] profile version: 2.0
OpenGL version string: 1.4 Mesa 20.3.5
OpenGL ES profile version string: OpenGL ES 2.0 Mesa 20.3.5
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 1.0.16

-- System Information:
Debian Release: 11.7
APT prefers stable
APT policy: (900, 'stable'), (500, 'oldoldstable')
Architecture: i386 (i686)

Kernel: Linux 5.10.0-10-686 (SMP w/2 CPU threads)

Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8), LANGUAGE not set

Shell: /bin/sh linked to /bin/dash

Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages gl-117 depends on:
ii freeglut3 2.8.1-6
ii gl-117-data 1.3.2-3

ii libc6 2.31-13+deb11u6
ii libgcc-s1 [libgcc1] 10.2.1-6
ii libgcc1 1:8.3.0-6