1/**************************************************************************** 2** 3** Copyright (C) 2014 NVIDIA Corporation. 4** Copyright (C) 2019 The Qt Company Ltd. 5** Contact: https://www.qt.io/licensing/ 6** 7** This file is part of Qt 3D Studio. 8** 9** $QT_BEGIN_LICENSE:GPL$ 10** Commercial License Usage 11** Licensees holding valid commercial Qt licenses may use this file in 12** accordance with the commercial license agreement provided with the 13** Software or, alternatively, in accordance with the terms contained in 14** a written agreement between you and The Qt Company. For licensing terms 15** and conditions see https://www.qt.io/terms-conditions. For further 16** information use the contact form at https://www.qt.io/contact-us. 17** 18** GNU General Public License Usage 19** Alternatively, this file may be used under the terms of the GNU 20** General Public License version 3 or (at your option) any later version 21** approved by the KDE Free Qt Foundation. The licenses are as published by 22** the Free Software Foundation and appearing in the file LICENSE.GPL3 23** included in the packaging of this file. Please review the following 24** information to ensure the GNU General Public License requirements will 25** be met: https://www.gnu.org/licenses/gpl-3.0.html. 26** 27** $QT_END_LICENSE$ 28** 29****************************************************************************/ 30 31vec4 miNoise( in vec3 xyz ) 32{ 33 const float div = 1.0 / 256.0; 34 35 ivec3 itmp = ivec3( xyz ); 36 ivec3 ixyz[3] = ivec3[]( itmp & 0xFF, itmp+1 & 0xFF, itmp+2 & 0xFF ); 37 vec3 fxyz = xyz - floor( xyz ); 38 39 vec3 dux, ux; 40 dux.z = fxyz.x * div; 41 dux.y = div - 2.0 * dux.z; 42 dux.x = dux.z - div; 43 ux.z = 0.5 * fxyz.x * dux.z; 44 ux.y = dux.z + 0.5 * ( div - fxyz.x * dux.z ); 45 ux.x = ux.z - dux.z + 0.5 * div; 46 47 vec3 duy, uy; 48 duy.z = fxyz.y; 49 duy.y = 1.0 - 2.0 * duy.z; 50 duy.x = duy.z - 1.0; 51 uy.z = 0.5 * square( duy.z ); 52 uy.y = duy.z + 0.5 - square( duy.z ); 53 uy.x = uy.z - duy.z + 0.5; 54 55 float duz[3] = float[]( fxyz.z - 1.0, 1.0 - 2.0 * fxyz.z, fxyz.z ); 56 float uz[3] = float[]( 0.5 * square( fxyz.z ) - fxyz.z + 0.5, fxyz.z + 0.5 - square( fxyz.z ), 0.5 * square( fxyz.z ) ); 57 58 int xx = random255X( ixyz[0].x ); 59 int yx = random255Y( ixyz[0].y ); 60 int zx = random255Z( ixyz[0].z ); 61 int xy = random255X( ixyz[1].x ); 62 int yy = random255Y( ixyz[1].y ); 63 int zy = random255Z( ixyz[1].z ); 64 65 int xxxy = xx ^ xy; 66 int yxxy = yx ^ xy; 67 int zxxy = zx ^ xy; 68 int xxyy = xx ^ yy; 69 int yxyy = yx ^ yy; 70 int zxyy = zx ^ yy; 71 int xxzy = xx ^ zy; 72 int yxzy = yx ^ zy; 73 int zxzy = zx ^ zy; 74 75 int ixyzxx = ixyz[0].x ^ ixyz[1].x; 76 int ixyzyx = ixyz[0].y ^ ixyz[1].x; 77 int ixyzzx = ixyz[0].z ^ ixyz[1].x; 78 int ixyzxy = ixyz[0].x ^ ixyz[1].y; 79 int ixyzyy = ixyz[0].y ^ ixyz[1].y; 80 int ixyzzy = ixyz[0].z ^ ixyz[1].y; 81 int ixyzxz = ixyz[0].x ^ ixyz[1].z; 82 int ixyzyz = ixyz[0].y ^ ixyz[1].z; 83 int ixyzzz = ixyz[0].z ^ ixyz[1].z; 84 85 86 vec4 ret = vec4( 0.0, 0.0, 0.0, 0.0 ); 87 88 for ( int i=0 ; i<3 ; i++ ) 89 { 90 int iz = random255Z( ixyz[2][i] ); 91 92 mat3x3 nf = mat3x3( vec3( float( random255W( xxxy ^ iz ^ random255W( ixyzxx ^ ixyz[2][i] ) ) ) 93 , float( random255W( yxxy ^ iz ^ random255W( ixyzyx ^ ixyz[2][i] ) ) ) 94 , float( random255W( zxxy ^ iz ^ random255W( ixyzzx ^ ixyz[2][i] ) ) ) ) 95 , vec3( float( random255W( xxyy ^ iz ^ random255W( ixyzxy ^ ixyz[2][i] ) ) ) 96 , float( random255W( yxyy ^ iz ^ random255W( ixyzyy ^ ixyz[2][i] ) ) ) 97 , float( random255W( zxyy ^ iz ^ random255W( ixyzzy ^ ixyz[2][i] ) ) ) ) 98 , vec3( float( random255W( xxzy ^ iz ^ random255W( ixyzxz ^ ixyz[2][i] ) ) ) 99 , float( random255W( yxzy ^ iz ^ random255W( ixyzyz ^ ixyz[2][i] ) ) ) 100 , float( random255W( zxzy ^ iz ^ random255W( ixyzzz ^ ixyz[2][i] ) ) ) ) ); 101 102 float fxdz = dot( uy, dux * nf ); 103 vec3 dy = ux * nf; 104 float dz = dot( uy, dy ); 105 106 ret.x += uz[i] * fxdz; 107 ret.y += uz[i] * dot( duy, dy ); 108 ret.z += duz[i] * dz; 109 ret.w += uz[i] * dz; 110 } 111 return( ret ); 112} 113 114