source: branches/4.5.1/demos/boxes/roundedbox.cpp@ 896

Last change on this file since 896 was 2, checked in by Dmitry A. Kuminov, 16 years ago

Initially imported qt-all-opensource-src-4.5.1 from Trolltech.
File size: 6.5 KB
Line 
1/****************************************************************************
2**
3** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
4** Contact: Qt Software Information (qt-info@nokia.com)
5**
6** This file is part of the demonstration applications of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
9** Commercial Usage
10** Licensees holding valid Qt Commercial licenses may use this file in
11** accordance with the Qt Commercial License Agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and Nokia.
14**
15** GNU Lesser General Public License Usage
16** Alternatively, this file may be used under the terms of the GNU Lesser
17** General Public License version 2.1 as published by the Free Software
18** Foundation and appearing in the file LICENSE.LGPL included in the
19** packaging of this file. Please review the following information to
20** ensure the GNU Lesser General Public License version 2.1 requirements
21** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
22**
23** In addition, as a special exception, Nokia gives you certain
24** additional rights. These rights are described in the Nokia Qt LGPL
25** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
26** 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 are unsure which license is appropriate for your use, please
37** contact the sales department at qt-sales@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), offsetof(P3T2N3Vertex, position), 0},
50 {VertexDescription::TexCoord, GL_FLOAT, SIZE_OF_MEMBER(P3T2N3Vertex, texCoord) / sizeof(float), offsetof(P3T2N3Vertex, texCoord), 0},
51 {VertexDescription::Normal, GL_FLOAT, SIZE_OF_MEMBER(P3T2N3Vertex, normal) / sizeof(float), offsetof(P3T2N3Vertex, normal), 0},
52 {VertexDescription::Null, 0, 0, 0, 0},
53};
54
55//============================================================================//
56// GLRoundedBox //
57//============================================================================//
58
59float lerp(float a, float b, float t)
60{
61 return a * (1.0f - t) + b * t;
62}
63
64GLRoundedBox::GLRoundedBox(float r, float scale, int n)
65 : GLTriangleMesh<P3T2N3Vertex, unsigned short>((n+2)*(n+3)*4, (n+1)*(n+1)*24+36+72*(n+1))
66{
67 int vidx = 0, iidx = 0;
68 int vertexCountPerCorner = (n + 2) * (n + 3) / 2;
69
70 P3T2N3Vertex *vp = m_vb.lock();
71 unsigned short *ip = m_ib.lock();
72
73 if (!vp || !ip) {
74 qWarning("GLRoundedBox::GLRoundedBox: Failed to lock vertex buffer and/or index buffer.");
75 m_ib.unlock();
76 m_vb.unlock();
77 return;
78 }
79
80 for (int corner = 0; corner < 8; ++corner) {
81 gfx::Vector3f centre;
82 centre[0] = (corner & 1 ? 1.0f : -1.0f);
83 centre[1] = (corner & 2 ? 1.0f : -1.0f);
84 centre[2] = (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 gfx::Vector3f normal = gfx::Vector3f::vector(i - j, j, n + 1 - i).normalized();
133 gfx::Vector3f pos = centre * (0.5f - r + r * normal);
134
135 vp[vidx].position = scale * pos;
136 vp[vidx].normal = centre * normal;
137 vp[vidx].texCoord = gfx::Vector2f::vector(pos[0], pos[1]) + 0.5f;
138
139 // Corner polygons
140 if (i < n + 1) {
141 ip[iidx++] = vidx;
142 ip[iidx++] = vidx + i + 2 - winding;
143 ip[iidx++] = vidx + i + 1 + winding;
144 }
145 if (i < n) {
146 ip[iidx++] = vidx + i + 1 + winding;
147 ip[iidx++] = vidx + i + 2 - winding;
148 ip[iidx++] = vidx + 2 * i + 4;
149 }
150
151 ++vidx;
152 }
153 }
154
155 }
156
157 m_ib.unlock();
158 m_vb.unlock();
159}
160
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