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

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uniform sampler2D Texture0;

varying vec2 vUv;

void main(void)
{
    vec4 result;
    vec2 TextureCoord = vUv;

    $CONVOLUTION$

    gl_FragColor = vec4(result.xyz, 1.0);
}