/usr/share/glmark2/shaders/function-step-medium.all is in glmark2-data 2014.03+git20150611.fa71af2d-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | d = fract(3.0 * d) * fract(3.0 * d);
d = fract(sqrt(d));
|