1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
|
/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtQuick3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef QVECTOR_UTILS_P_H
#define QVECTOR_UTILS_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtGui/qvector3d.h>
#include <QtGui/qvector2d.h>
// Replacement for qFuzzyCompare(QVector3D, QVector3D) and friends,
// for a specific case where the results are going to be rendered
// by the GPU onto a display.
//
// The accuracy of this comparison should not change. Especially it
// should not change when you go from doubles to floats or when
// you get close to zero. If two verts or lighting normals are
// the same to within 5 places of floating point accuracy then they
// will dislay as being on top of each other.
//
// Also this avoids doing 3 floating point multiplications every time
// since the normal qFuzzyIsNull does a mul to scale the epsilon when
// close to zero.
inline bool qFskIsNull(double d)
{
return qAbs(d) <= 0.00001;
}
inline bool qFskIsNull(float f)
{
return qAbs(f) <= 0.00001f;
}
inline bool qFskCompare(float a, float b)
{
return qFskIsNull(a - b);
}
inline bool qFskCompare(double a, double b)
{
return qFskIsNull(a - b);
}
inline bool qFskCompare(const QVector3D &a, const QVector3D &b)
{
return (
qFskIsNull(a.x() - b.x()) &&
qFskIsNull(a.y() - b.y()) &&
qFskIsNull(a.z() - b.z())
);
}
inline bool qFskCompare(const QVector2D &a, const QVector2D &b)
{
return (
qFskIsNull(a.x() - b.x()) &&
qFskIsNull(a.y() - b.y())
);
}
#endif // QVECTOR_UTILS_P_H
|
