/usr/share/glmark2/shaders/terrain-overlay.frag 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 3 4 5 6 7 8 9 10 | uniform float opacity;
uniform sampler2D tDiffuse;
varying vec2 vUv;
void main()
{
vec4 texel = texture2D(tDiffuse, vUv);
gl_FragColor = opacity * texel;
}
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