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/usr/share/glmark2/shaders/ideas-logo-shadow.frag is in glmark2-data 2014.03+git20150611.fa71af2d-0ubuntu2.

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uniform sampler2D tex;

void main()
{
    vec2 curPos = gl_FragCoord.xy / 32.0;
    vec4 color = texture2D(tex, curPos);
    if (color.w < 0.5)
        discard;
    gl_FragColor = color;
}