/usr/share/xscreensaver/config/glmatrix.xml is in xscreensaver-gl 5.34-2ubuntu1.
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 45 46 47 48 49 50 51 52 53 | <?xml version="1.0" encoding="ISO-8859-1"?>
<screensaver name="glmatrix" _label="GLMatrix" gl="yes">
<command arg="-root"/>
<video href="http://www.youtube.com/watch?v=_dktSpsaCPg"/>
<number id="delay" type="slider" arg="-delay %"
_label="Frame rate" _low-label="Low" _high-label="High"
low="0" high="100000" default="30000"
convert="invert"/>
<number id="density" type="slider" arg="-density %"
_label="Glyph density" _low-label="Sparse" _high-label="Dense"
low="0" high="100" default="20"/>
<number id="speed" type="slider" arg="-speed %"
_label="Glyph speed" _low-label="Slow" _high-label="Fast"
low="0.1" high="8.0" default="1.0"/>
<select id="mode">
<option id="matrix" _label="Matrix encoding"/>
<option id="binary" _label="Binary encoding" arg-set="-mode binary"/>
<option id="hex" _label="Hexadecimal encoding" arg-set="-mode hex"/>
<option id="dna" _label="Genetic encoding" arg-set="-mode dna"/>
</select>
<hgroup>
<boolean id="fog" _label="Fog" arg-unset="-no-fog"/>
<boolean id="waves" _label="Waves" arg-unset="-no-waves"/>
<boolean id="rotate" _label="Panning" arg-unset="-no-rotate"/>
</hgroup>
<hgroup>
<boolean id="tex" _label="Textured" arg-unset="-no-texture"/>
<boolean id="wire" _label="Wireframe" arg-set="-wireframe"/>
<boolean id="showfps" _label="Show frame rate" arg-set="-fps"/>
</hgroup>
<xscreensaver-updater />
<_description>
The 3D "digital rain" effect, as seen in the title sequence of "The Matrix".
See also "xmatrix" for a 2D rendering of the similar effect that
appeared on the computer monitors actually *in* the movie.
https://en.wikipedia.org/wiki/Matrix_digital_rain
Written by Jamie Zawinski; 2003.
</_description>
</screensaver>
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