source: trunk/demos/boxes/roundedbox.cpp@ 1063

Last change on this file since 1063 was 846, checked in by Dmitry A. Kuminov, 15 years ago

trunk: Merged in qt 4.7.2 sources from branches/vendor/nokia/qt.
File size: 6.5 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
4** All rights reserved.
5** Contact: Nokia Corporation (qt-info@nokia.com)
6**
7** This file is part of the demonstration applications of the Qt Toolkit.
8**
9** $QT_BEGIN_LICENSE:LGPL$
10** Commercial Usage
11** Licensees holding valid Qt Commercial licenses may use this file in
12** accordance with the Qt Commercial License Agreement provided with the
13** Software or, alternatively, in accordance with the terms contained in
14** a written agreement between you and Nokia.
15**
16** GNU Lesser General Public License Usage
17** Alternatively, this file may be used under the terms of the GNU Lesser
18** General Public License version 2.1 as published by the Free Software
19** Foundation and appearing in the file LICENSE.LGPL included in the
20** packaging of this file. Please review the following information to
21** ensure the GNU Lesser General Public License version 2.1 requirements
22** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
23**
24** In addition, as a special exception, Nokia gives you certain additional
25** rights. These rights are described in the Nokia Qt LGPL Exception
26** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
27**
28** GNU General Public License Usage
29** Alternatively, this file may be used under the terms of the GNU
30** General Public License version 3.0 as published by the Free Software
31** Foundation and appearing in the file LICENSE.GPL included in the
32** packaging of this file. Please review the following information to
33** ensure the GNU General Public License version 3.0 requirements will be
34** met: http://www.gnu.org/copyleft/gpl.html.
35**
36** If you have questions regarding the use of this file, please contact
37** Nokia at qt-info@nokia.com.
38** $QT_END_LICENSE$
39**
40****************************************************************************/
41
42#include "roundedbox.h"
43
44//============================================================================//
45// P3T2N3Vertex //
46//============================================================================//
47
48VertexDescription P3T2N3Vertex::description[] = {
49 {VertexDescription::Position, GL_FLOAT, SIZE_OF_MEMBER(P3T2N3Vertex, position) / sizeof(float), 0, 0},
50 {VertexDescription::TexCoord, GL_FLOAT, SIZE_OF_MEMBER(P3T2N3Vertex, texCoord) / sizeof(float), sizeof(QVector3D), 0},
51 {VertexDescription::Normal, GL_FLOAT, SIZE_OF_MEMBER(P3T2N3Vertex, normal) / sizeof(float), sizeof(QVector3D) + sizeof(QVector2D), 0},
52
53 {VertexDescription::Null, 0, 0, 0, 0},
54};
55
56//============================================================================//
57// GLRoundedBox //
58//============================================================================//
59
60float lerp(float a, float b, float t)
61{
62 return a * (1.0f - t) + b * t;
63}
64
65GLRoundedBox::GLRoundedBox(float r, float scale, int n)
66 : GLTriangleMesh<P3T2N3Vertex, unsigned short>((n+2)*(n+3)*4, (n+1)*(n+1)*24+36+72*(n+1))
67{
68 int vidx = 0, iidx = 0;
69 int vertexCountPerCorner = (n + 2) * (n + 3) / 2;
70
71 P3T2N3Vertex *vp = m_vb.lock();
72 unsigned short *ip = m_ib.lock();
73
74 if (!vp || !ip) {
75 qWarning("GLRoundedBox::GLRoundedBox: Failed to lock vertex buffer and/or index buffer.");
76 m_ib.unlock();
77 m_vb.unlock();
78 return;
79 }
80
81 for (int corner = 0; corner < 8; ++corner) {
82 QVector3D centre(corner & 1 ? 1.0f : -1.0f,
83 corner & 2 ? 1.0f : -1.0f,
84 corner & 4 ? 1.0f : -1.0f);
85 int winding = (corner & 1) ^ ((corner >> 1) & 1) ^ (corner >> 2);
86 int offsX = ((corner ^ 1) - corner) * vertexCountPerCorner;
87 int offsY = ((corner ^ 2) - corner) * vertexCountPerCorner;
88 int offsZ = ((corner ^ 4) - corner) * vertexCountPerCorner;
89
90 // Face polygons
91 if (winding) {
92 ip[iidx++] = vidx;
93 ip[iidx++] = vidx + offsX;
94 ip[iidx++] = vidx + offsY;
95
96 ip[iidx++] = vidx + vertexCountPerCorner - n - 2;
97 ip[iidx++] = vidx + vertexCountPerCorner - n - 2 + offsY;
98 ip[iidx++] = vidx + vertexCountPerCorner - n - 2 + offsZ;
99
100 ip[iidx++] = vidx + vertexCountPerCorner - 1;
101 ip[iidx++] = vidx + vertexCountPerCorner - 1 + offsZ;
102 ip[iidx++] = vidx + vertexCountPerCorner - 1 + offsX;
103 }
104
105 for (int i = 0; i < n + 2; ++i) {
106
107 // Edge polygons
108 if (winding && i < n + 1) {
109 ip[iidx++] = vidx + i + 1;
110 ip[iidx++] = vidx;
111 ip[iidx++] = vidx + offsY + i + 1;
112 ip[iidx++] = vidx + offsY;
113 ip[iidx++] = vidx + offsY + i + 1;
114 ip[iidx++] = vidx;
115
116 ip[iidx++] = vidx + i;
117 ip[iidx++] = vidx + 2 * i + 2;
118 ip[iidx++] = vidx + i + offsX;
119 ip[iidx++] = vidx + 2 * i + offsX + 2;
120 ip[iidx++] = vidx + i + offsX;
121 ip[iidx++] = vidx + 2 * i + 2;
122
123 ip[iidx++] = (corner + 1) * vertexCountPerCorner - 1 - i;
124 ip[iidx++] = (corner + 1) * vertexCountPerCorner - 2 - i;
125 ip[iidx++] = (corner + 1) * vertexCountPerCorner - 1 - i + offsZ;
126 ip[iidx++] = (corner + 1) * vertexCountPerCorner - 2 - i + offsZ;
127 ip[iidx++] = (corner + 1) * vertexCountPerCorner - 1 - i + offsZ;
128 ip[iidx++] = (corner + 1) * vertexCountPerCorner - 2 - i;
129 }
130
131 for (int j = 0; j <= i; ++j) {
132 QVector3D normal = QVector3D(i - j, j, n + 1 - i).normalized();
133 QVector3D offset(0.5f - r, 0.5f - r, 0.5f - r);
134 QVector3D pos = centre * (offset + r * normal);
135
136 vp[vidx].position = scale * pos;
137 vp[vidx].normal = centre * normal;
138 vp[vidx].texCoord = QVector2D(pos.x() + 0.5f, pos.y() + 0.5f);
139
140 // Corner polygons
141 if (i < n + 1) {
142 ip[iidx++] = vidx;
143 ip[iidx++] = vidx + i + 2 - winding;
144 ip[iidx++] = vidx + i + 1 + winding;
145 }
146 if (i < n) {
147 ip[iidx++] = vidx + i + 1 + winding;
148 ip[iidx++] = vidx + i + 2 - winding;
149 ip[iidx++] = vidx + 2 * i + 4;
150 }
151
152 ++vidx;
153 }
154 }
155
156 }
157
158 m_ib.unlock();
159 m_vb.unlock();
160}
161
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