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/usr/share/psychtoolbox-3/PsychOpenGL/PsychGLSLShaders/ICMPassThroughShader.frag.txt is in psychtoolbox-3-common 3.0.11.20140816.dfsg1-1.

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/* Shader for doing nothing.
 *
 * Passes through all values -- Only useful for benchmarking - as baseline.
 *
 * (w)2008 by Mario Kleiner. Licensed under MIT license.
*/

/* Allowable range: To be initialized by PsychColorCorrection() typically: */
uniform vec2    ICMClampToColorRange;

vec4 icmTransformColor(vec4 incolor)
{
    return(incolor);
}

float icmTransformColor1(float incolor)
{
    return(incolor);
}