/usr/share/gem/examples/data/Toon.frag is in gem-doc 1:0.93.3-5ubuntu4.
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// Fragment shader for cartoon-style shading
//
// Author: Philip Rideout
//
// Copyright (c) 2005 3Dlabs Inc. Ltd.
//
/************************************************************************
* *
* Copyright (C) 2002-2006 3Dlabs Inc. Ltd. *
* *
* All rights reserved. *
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* Redistribution and use in source and binary forms, with or without *
* modification, are permitted provided that the following conditions *
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* Redistributions of source code must retain the above copyright *
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* with the distribution. *
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* contributors may be used to endorse or promote products derived *
* from this software without specific prior written permission. *
* *
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
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const vec3 DiffuseColor= vec3( 0.1,0.1,0.1);
const vec3 PhongColor = vec3( 0.5,0.5,0.5);
const float Edge= 0.2;
uniform float Phong;
varying vec3 Normal;
void main (void)
{
vec3 color = DiffuseColor;
float f = dot(vec3(0,0,1),Normal);
if (abs(f) < Edge)
color = vec3(0);
if (f > Phong)
color = PhongColor;
gl_FragColor = vec4(color, 1);
}
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