1/**************************************************************************** 2** 3** Copyright (C) 2015 The Qt Company Ltd. 4** Contact: http://www.qt.io/licensing/ 5** 6** This file is part of the demonstration applications of the Qt Toolkit. 7** 8** $QT_BEGIN_LICENSE:LGPL$ 9** Commercial License Usage 10** Licensees holding valid commercial Qt licenses may use this file in 11** accordance with the commercial license agreement provided with the 12** Software or, alternatively, in accordance with the terms contained in 13** a written agreement between you and The Qt Company. For licensing terms 14** and conditions see http://www.qt.io/terms-conditions. For further 15** information use the contact form at http://www.qt.io/contact-us. 16** 17** GNU Lesser General Public License Usage 18** Alternatively, this file may be used under the terms of the GNU Lesser 19** General Public License version 2.1 or version 3 as published by the Free 20** Software Foundation and appearing in the file LICENSE.LGPLv21 and 21** LICENSE.LGPLv3 included in the packaging of this file. Please review the 22** following information to ensure the GNU Lesser General Public License 23** requirements will be met: https://www.gnu.org/licenses/lgpl.html and 24** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. 25** 26** As a special exception, The Qt Company gives you certain additional 27** rights. These rights are described in The Qt Company LGPL Exception 28** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. 29** 30** GNU General Public License Usage 31** Alternatively, this file may be used under the terms of the GNU 32** General Public License version 3.0 as published by the Free Software 33** Foundation and appearing in the file LICENSE.GPL included in the 34** packaging of this file. Please review the following information to 35** ensure the GNU General Public License version 3.0 requirements will be 36** met: http://www.gnu.org/copyleft/gpl.html. 37** 38** $QT_END_LICENSE$ 39** 40****************************************************************************/ 41 42varying vec3 position, normal; 43varying vec4 specular, ambient, diffuse, lightDirection; 44 45uniform sampler2D tex; 46uniform samplerCube env; 47uniform mat4 view; 48 49// Some arbitrary values 50// Arrays don't work here on glsl < 120, apparently. 51//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); 52float coeffs(int i) 53{ 54 return 1.0 / (3.0 + 0.1 * float(i)); 55} 56 57void main() 58{ 59 vec3 N = normalize(normal); 60 vec3 I = -normalize(position); 61 mat3 V = mat3(view[0].xyz, view[1].xyz, view[2].xyz); 62 float IdotN = dot(I, N); 63 float scales[6]; 64 vec3 C[6]; 65 for (int i = 0; i < 6; ++i) { 66 scales[i] = (IdotN - sqrt(1.0 - coeffs(i) + coeffs(i) * (IdotN * IdotN))); 67 C[i] = textureCube(env, (-I + coeffs(i) * N) * V).xyz; 68 } 69 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, 70 C[3].z + 2.0*C[4].z + C[5].z, 4.0); 71 72 vec3 R = 2.0 * dot(-position, N) * N + position; 73 vec4 reflectedColor = textureCube(env, R * V); 74 75 gl_FragColor = mix(refractedColor, reflectedColor, 0.4 + 0.6 * pow(1.0 - IdotN, 2.0)); 76} 77