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1 /**************************************************************************** |
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2 ** |
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3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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4 ** All rights reserved. |
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5 ** Contact: Nokia Corporation (qt-info@nokia.com) |
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6 ** |
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7 ** This file is part of the demonstration applications of the Qt Toolkit. |
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8 ** |
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9 ** $QT_BEGIN_LICENSE:LGPL$ |
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10 ** No Commercial Usage |
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11 ** This file contains pre-release code and may not be distributed. |
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12 ** You may use this file in accordance with the terms and conditions |
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13 ** contained in the Technology Preview License Agreement accompanying |
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14 ** this package. |
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15 ** |
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16 ** GNU Lesser General Public License Usage |
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17 ** Alternatively, this file may be used under the terms of the GNU Lesser |
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18 ** General Public License version 2.1 as published by the Free Software |
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19 ** Foundation and appearing in the file LICENSE.LGPL included in the |
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20 ** packaging of this file. Please review the following information to |
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21 ** ensure the GNU Lesser General Public License version 2.1 requirements |
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22 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. |
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23 ** |
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24 ** In addition, as a special exception, Nokia gives you certain additional |
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25 ** rights. These rights are described in the Nokia Qt LGPL Exception |
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26 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. |
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27 ** |
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28 ** If you have questions regarding the use of this file, please contact |
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29 ** Nokia at qt-info@nokia.com. |
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30 ** |
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31 ** |
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32 ** |
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33 ** |
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34 ** |
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35 ** |
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36 ** |
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37 ** |
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38 ** $QT_END_LICENSE$ |
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39 ** |
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40 ****************************************************************************/ |
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41 |
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42 varying vec3 position, normal; |
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43 varying vec4 specular, ambient, diffuse, lightDirection; |
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44 |
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45 uniform sampler2D tex; |
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46 uniform samplerCube env; |
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47 uniform mat4 view; |
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48 |
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49 // Some arbitrary values |
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50 // Arrays don't work here on glsl < 120, apparently. |
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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); |
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52 float coeffs(int i) |
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53 { |
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54 return 1.0 / (3.0 + 0.1 * float(i)); |
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55 } |
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56 |
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57 void main() |
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58 { |
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59 vec3 N = normalize(normal); |
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60 vec3 I = -normalize(position); |
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61 mat3 V = mat3(view[0].xyz, view[1].xyz, view[2].xyz); |
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62 float IdotN = dot(I, N); |
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63 float scales[6]; |
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64 vec3 C[6]; |
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65 for (int i = 0; i < 6; ++i) { |
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66 scales[i] = (IdotN - sqrt(1.0 - coeffs(i) + coeffs(i) * (IdotN * IdotN))); |
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67 C[i] = textureCube(env, (-I + coeffs(i) * N) * V).xyz; |
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68 } |
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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, |
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70 C[3].z + 2.0*C[4].z + C[5].z, 4.0); |
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71 |
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72 vec3 R = 2.0 * dot(-position, N) * N + position; |
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73 vec4 reflectedColor = textureCube(env, R * V); |
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74 |
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75 gl_FragColor = mix(refractedColor, reflectedColor, 0.4 + 0.6 * pow(1.0 - IdotN, 2.0)); |
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76 } |