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

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uniform sampler2D MaterialTexture0;

varying vec2 TextureCoord;

void main(void)
{
    vec4 texel = texture2D(MaterialTexture0, TextureCoord);
    gl_FragColor = texel;
}