/****************************************************************************+
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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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**+
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**+
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**+
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**+
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**+
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**+
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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 samplerCube env;+
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uniform mat4 view;+
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+
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// Some arbitrary values+
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// Arrays don't work here on glsl < 120, apparently.+
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//const float coeffs[6] = float[6](1.0/4.0, 1.0/4.1, 1.0/4.2, 1.0/4.3, 1.0/4.4, 1.0/4.5);+
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float coeffs(int i)+
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{+
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	return 1.0 / (3.0 + 0.1 * float(i));+
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}+
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+
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void main()+
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{+
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    vec3 N = normalize(normal);+
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    vec3 I = -normalize(position);+
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    mat3 V = mat3(view[0].xyz, view[1].xyz, view[2].xyz);+
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    float IdotN = dot(I, N);+
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    float scales[6];+
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    vec3 C[6];+
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    for (int i = 0; i < 6; ++i) {+
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        scales[i] = (IdotN - sqrt(1.0 - coeffs(i) + coeffs(i) * (IdotN * IdotN)));+
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        C[i] = textureCube(env, (-I + coeffs(i) * N) * V).xyz;+
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    }+
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    vec4 refractedColor = 0.25 * vec4(C[5].x + 2.0*C[0].x + C[1].x, C[1].y + 2.0*C[2].y + C[3].y,+
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                          C[3].z + 2.0*C[4].z + C[5].z, 4.0);+
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+
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    vec3 R = 2.0 * dot(-position, N) * N + position;+
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    vec4 reflectedColor = textureCube(env, R * V);+
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+
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    gl_FragColor = mix(refractedColor, reflectedColor, 0.4 + 0.6 * pow(1.0 - IdotN, 2.0));+
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}+
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