/usr/share/xscreensaver/config/glblur.xml is in xscreensaver-gl 5.30-1+deb8u2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="glblur" _label="GLBlur" gl="yes">
<command arg="-root"/>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="10000"
convert="invert"/>
<number id="blursize" type="slider" arg="-blursize %"
_label="Blur smoothness" _low-label="Sparse" _high-label="Dense"
low="1" high="100" default="15"/>
<boolean id="wander" _label="Wander" arg-unset="-no-wander"/>
<select id="rotation">
<option id="no" _label="Don't rotate" arg-set="-spin 0"/>
<option id="x" _label="Rotate around X axis" arg-set="-spin X"/>
<option id="y" _label="Rotate around Y axis" arg-set="-spin Y"/>
<option id="z" _label="Rotate around Z axis" arg-set="-spin Z"/>
<option id="xy" _label="Rotate around X and Y axes" arg-set="-spin XY"/>
<option id="xz" _label="Rotate around X and Z axes" arg-set="-spin XZ"/>
<option id="yz" _label="Rotate around Y and Z axes" arg-set="-spin YZ"/>
<option id="xyz" _label="Rotate around all three axes"/>
</select>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
<xscreensaver-updater />
<_description>
Flowing field effects from the vapor trails around a moving object.
This is done by rendering the scene into a small texture, then
repeatedly rendering increasingly-enlarged and increasingly-transparent
versions of that texture onto the frame buffer. As such, it's quite
GPU-intensive: if you don't have a very good graphics card, it
will hurt your machine bad.
Written by Jamie Zawinski; 2002.
</_description>
</screensaver>
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