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 | ** Contact: Qt Software Information (qt-info@nokia.com)
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5 | **
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6 | ** This file is part of the demonstration applications of the Qt Toolkit.
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7 | **
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8 | ** $QT_BEGIN_LICENSE:LGPL$
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9 | ** Commercial Usage
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10 | ** Licensees holding valid Qt Commercial licenses may use this file in
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11 | ** accordance with the Qt Commercial License Agreement provided with the
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12 | ** Software or, alternatively, in accordance with the terms contained in
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13 | ** a written agreement between you and Nokia.
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14 | **
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15 | ** GNU Lesser General Public License Usage
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16 | ** Alternatively, this file may be used under the terms of the GNU Lesser
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17 | ** General Public License version 2.1 as published by the Free Software
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18 | ** Foundation and appearing in the file LICENSE.LGPL included in the
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19 | ** packaging of this file. Please review the following information to
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20 | ** ensure the GNU Lesser General Public License version 2.1 requirements
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21 | ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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22 | **
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23 | ** In addition, as a special exception, Nokia gives you certain
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24 | ** additional rights. These rights are described in the Nokia Qt LGPL
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25 | ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
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26 | ** package.
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27 | **
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28 | ** GNU General Public License Usage
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29 | ** Alternatively, this file may be used under the terms of the GNU
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30 | ** General Public License version 3.0 as published by the Free Software
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31 | ** Foundation and appearing in the file LICENSE.GPL included in the
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32 | ** packaging of this file. Please review the following information to
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33 | ** ensure the GNU General Public License version 3.0 requirements will be
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34 | ** met: http://www.gnu.org/copyleft/gpl.html.
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35 | **
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36 | ** If you are unsure which license is appropriate for your use, please
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37 | ** contact the sales department at qt-sales@nokia.com.
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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 | #include "roundedbox.h"
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43 |
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44 | //============================================================================//
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45 | // P3T2N3Vertex //
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46 | //============================================================================//
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47 |
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48 | VertexDescription P3T2N3Vertex::description[] = {
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49 | {VertexDescription::Position, GL_FLOAT, SIZE_OF_MEMBER(P3T2N3Vertex, position) / sizeof(float), offsetof(P3T2N3Vertex, position), 0},
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50 | {VertexDescription::TexCoord, GL_FLOAT, SIZE_OF_MEMBER(P3T2N3Vertex, texCoord) / sizeof(float), offsetof(P3T2N3Vertex, texCoord), 0},
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51 | {VertexDescription::Normal, GL_FLOAT, SIZE_OF_MEMBER(P3T2N3Vertex, normal) / sizeof(float), offsetof(P3T2N3Vertex, normal), 0},
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52 | {VertexDescription::Null, 0, 0, 0, 0},
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53 | };
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54 |
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55 | //============================================================================//
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56 | // GLRoundedBox //
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57 | //============================================================================//
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58 |
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59 | float lerp(float a, float b, float t)
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60 | {
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61 | return a * (1.0f - t) + b * t;
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62 | }
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63 |
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64 | GLRoundedBox::GLRoundedBox(float r, float scale, int n)
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65 | : GLTriangleMesh<P3T2N3Vertex, unsigned short>((n+2)*(n+3)*4, (n+1)*(n+1)*24+36+72*(n+1))
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66 | {
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67 | int vidx = 0, iidx = 0;
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68 | int vertexCountPerCorner = (n + 2) * (n + 3) / 2;
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69 |
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70 | P3T2N3Vertex *vp = m_vb.lock();
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71 | unsigned short *ip = m_ib.lock();
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72 |
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73 | if (!vp || !ip) {
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74 | qWarning("GLRoundedBox::GLRoundedBox: Failed to lock vertex buffer and/or index buffer.");
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75 | m_ib.unlock();
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76 | m_vb.unlock();
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77 | return;
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78 | }
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79 |
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80 | for (int corner = 0; corner < 8; ++corner) {
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81 | gfx::Vector3f centre;
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82 | centre[0] = (corner & 1 ? 1.0f : -1.0f);
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83 | centre[1] = (corner & 2 ? 1.0f : -1.0f);
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84 | centre[2] = (corner & 4 ? 1.0f : -1.0f);
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85 | int winding = (corner & 1) ^ ((corner >> 1) & 1) ^ (corner >> 2);
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86 | int offsX = ((corner ^ 1) - corner) * vertexCountPerCorner;
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87 | int offsY = ((corner ^ 2) - corner) * vertexCountPerCorner;
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88 | int offsZ = ((corner ^ 4) - corner) * vertexCountPerCorner;
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89 |
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90 | // Face polygons
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91 | if (winding) {
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92 | ip[iidx++] = vidx;
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93 | ip[iidx++] = vidx + offsX;
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94 | ip[iidx++] = vidx + offsY;
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95 |
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96 | ip[iidx++] = vidx + vertexCountPerCorner - n - 2;
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97 | ip[iidx++] = vidx + vertexCountPerCorner - n - 2 + offsY;
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98 | ip[iidx++] = vidx + vertexCountPerCorner - n - 2 + offsZ;
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99 |
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100 | ip[iidx++] = vidx + vertexCountPerCorner - 1;
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101 | ip[iidx++] = vidx + vertexCountPerCorner - 1 + offsZ;
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102 | ip[iidx++] = vidx + vertexCountPerCorner - 1 + offsX;
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103 | }
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104 |
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105 | for (int i = 0; i < n + 2; ++i) {
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106 |
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107 | // Edge polygons
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108 | if (winding && i < n + 1) {
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109 | ip[iidx++] = vidx + i + 1;
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110 | ip[iidx++] = vidx;
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111 | ip[iidx++] = vidx + offsY + i + 1;
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112 | ip[iidx++] = vidx + offsY;
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113 | ip[iidx++] = vidx + offsY + i + 1;
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114 | ip[iidx++] = vidx;
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115 |
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116 | ip[iidx++] = vidx + i;
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117 | ip[iidx++] = vidx + 2 * i + 2;
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118 | ip[iidx++] = vidx + i + offsX;
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119 | ip[iidx++] = vidx + 2 * i + offsX + 2;
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120 | ip[iidx++] = vidx + i + offsX;
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121 | ip[iidx++] = vidx + 2 * i + 2;
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122 |
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123 | ip[iidx++] = (corner + 1) * vertexCountPerCorner - 1 - i;
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124 | ip[iidx++] = (corner + 1) * vertexCountPerCorner - 2 - i;
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125 | ip[iidx++] = (corner + 1) * vertexCountPerCorner - 1 - i + offsZ;
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126 | ip[iidx++] = (corner + 1) * vertexCountPerCorner - 2 - i + offsZ;
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127 | ip[iidx++] = (corner + 1) * vertexCountPerCorner - 1 - i + offsZ;
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128 | ip[iidx++] = (corner + 1) * vertexCountPerCorner - 2 - i;
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129 | }
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130 |
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131 | for (int j = 0; j <= i; ++j) {
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132 | gfx::Vector3f normal = gfx::Vector3f::vector(i - j, j, n + 1 - i).normalized();
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133 | gfx::Vector3f pos = centre * (0.5f - r + r * normal);
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134 |
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135 | vp[vidx].position = scale * pos;
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136 | vp[vidx].normal = centre * normal;
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137 | vp[vidx].texCoord = gfx::Vector2f::vector(pos[0], pos[1]) + 0.5f;
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138 |
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139 | // Corner polygons
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140 | if (i < n + 1) {
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141 | ip[iidx++] = vidx;
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142 | ip[iidx++] = vidx + i + 2 - winding;
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143 | ip[iidx++] = vidx + i + 1 + winding;
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144 | }
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145 | if (i < n) {
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146 | ip[iidx++] = vidx + i + 1 + winding;
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147 | ip[iidx++] = vidx + i + 2 - winding;
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148 | ip[iidx++] = vidx + 2 * i + 4;
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149 | }
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150 |
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151 | ++vidx;
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152 | }
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153 | }
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154 |
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155 | }
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156 |
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157 | m_ib.unlock();
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158 | m_vb.unlock();
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159 | }
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160 |
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