source: data/branches/Shader_HS18/programs/GLSL/DepthShadowmapCasterFp.glsl

#version 120

varying vec2 depth;

void main()
{
        float finalDepth = depth.x / depth.y;

        // just smear across all components 
        // therefore this one needs high individual channel precision
        gl_FragColor = vec4(finalDepth, finalDepth, finalDepth, 1.0);
}