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/usr/share/psychtoolbox-3/PsychOpenGL/PsychGLSLShaders/moglFDFTrackingRenderShader.frag.txt is in psychtoolbox-3-common 3.0.11.20131230.dfsg1-1build1.

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/* FDF fragment shader for 2nd object render pass: Interpolated texture coordinates
 * are actually interpolated image space (x',y',z') coordinates. They are written
 * to the RG channels for x'y' image space positions.
 *
 * (c) 2008 by Mario Kleiner, licensed under MIT license.
 */

void main(void)
{
    gl_FragColor = gl_TexCoord[0];
}