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/usr/share/glmark2/shaders/loop.frag is in glmark2-data 2014.03+git20150611.fa71af2d-0ubuntu4.

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varying vec4 dummy;
uniform int FragmentLoops;

void main(void)
{
    float d = fract(gl_FragCoord.x * gl_FragCoord.y * 0.0001);

$MAIN$

    gl_FragColor = vec4(d, d, d, 1.0);
}