/****************************************************************************+
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**+
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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the demonstration applications of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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varying vec3 position, normal;+
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varying vec4 specular, ambient, diffuse, lightDirection;+
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+
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uniform sampler2D tex;+
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uniform sampler3D noise;+
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+
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//const vec4 marbleColors[2] = {vec4(0.9, 0.9, 0.9, 1), vec4(0.6, 0.5, 0.5, 1)};+
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uniform vec4 marbleColors[2];+
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+
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void main()+
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{+
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    float turbulence = 0.0;+
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    float scale = 1.0;+
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    for (int i = 0; i < 4; ++i) {+
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        turbulence += scale * (texture3D(noise, 0.125 * gl_TexCoord[1].xyz / scale).x - 0.5);+
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        scale *= 0.5;+
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    }+
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+
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    vec3 N = normalize(normal);+
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    // assume directional light+
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+
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    gl_MaterialParameters M = gl_FrontMaterial;+
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+
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    float NdotL = dot(N, lightDirection.xyz);+
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    float RdotL = dot(reflect(normalize(position), N), lightDirection.xyz);+
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+
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    vec4 unlitColor = mix(marbleColors[0], marbleColors[1], exp(-4.0 * abs(turbulence)));+
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    gl_FragColor = (ambient + diffuse * max(NdotL, 0.0)) * unlitColor ++
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                    M.specular * specular * pow(max(RdotL, 0.0), M.shininess);+
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}+
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