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
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
|
/****************************************************************************
**
** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt3D module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qpointlight.h"
#include "qpointlight_p.h"
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
/*
Expected Shader struct
\code
struct PointLight
{
vec3 position;
vec4 color;
float intensity;
};
uniform PointLight pointLights[10];
\endcode
*/
QPointLightPrivate::QPointLightPrivate()
: QAbstractLightPrivate(QAbstractLight::PointLight)
{
m_shaderData->setProperty("constantAttenuation", 1.0f);
m_shaderData->setProperty("linearAttenuation", 0.0f);
m_shaderData->setProperty("quadraticAttenuation", 0.0f);
}
/*!
\class Qt3DRender::QPointLight
\inmodule Qt3DRender
\since 5.5
\brief Encapsulate a Point Light object in a Qt 3D scene.
A point light is a light source that emits light in all directions, from a single point.
Conceptually, this is similar to light given off by a standard light bulb.
A point light uses three attenuation factors to describe how the intensity of the light
decreases over distance. These factors are designed to be used together in calcuating total
attenuation. For the materials in Qt3D Extras the following formula is used, where distance
is the distance from the light to the surface being rendered:
\code
totalAttenuation = 1.0 / (constantAttenuation + (linearAttenuation * distance) + (quadraticAttenuation * distance * distance));
\endcode
Custom materials may choose to interpret these factors differently.
*/
/*!
\qmltype PointLight
\instantiates Qt3DRender::QPointLight
\inherits AbstractLight
\inqmlmodule Qt3D.Render
\since 5.5
\brief Encapsulate a Point Light object in a Qt 3D scene.
A point light is a light source that emits light in all directions, from a single point.
Conceptually, this is similar to light given off by a standard light bulb.
A point light uses three attenuation factors to describe how the intensity of the light
decreases over distance. These factors are designed to be used together in calcuating total
attenuation. For the materials in Qt3D Extras the following formula is used, where distance
is the distance from the light to the surface being rendered:
\code
totalAttenuation = 1.0 / (constantAttenuation + (linearAttenuation * distance) + (quadraticAttenuation * distance * distance));
\endcode
Custom materials may choose to interpret these factors differently.
*/
/*!
\fn Qt3DRender::QPointLight::QPointLight(Qt3DCore::QNode *parent)
Constructs a new QPointLight with the specified \a parent.
*/
QPointLight::QPointLight(QNode *parent)
: QAbstractLight(*new QPointLightPrivate, parent)
{
}
/*! \internal */
QPointLight::~QPointLight()
{
}
/*! \internal */
QPointLight::QPointLight(QPointLightPrivate &dd, QNode *parent)
: QAbstractLight(dd, parent)
{
}
/*!
\qmlproperty float Qt3D.Render::PointLight::constantAttenuation
Specifies the constant attenuation of the point light
*/
/*!
\property Qt3DRender::QPointLight::constantAttenuation
Specifies the constant attenuation of the point light
*/
float QPointLight::constantAttenuation() const
{
Q_D(const QPointLight);
return d->m_shaderData->property("constantAttenuation").toFloat();
}
void QPointLight::setConstantAttenuation(float value)
{
Q_D(QPointLight);
if (constantAttenuation() != value) {
d->m_shaderData->setProperty("constantAttenuation", value);
emit constantAttenuationChanged(value);
}
}
/*!
\qmlproperty float Qt3D.Render::PointLight::linearAttenuation
Specifies the linear attenuation of the point light
*/
/*!
\property Qt3DRender::QPointLight::linearAttenuation
Specifies the linear attenuation of the point light
*/
float QPointLight::linearAttenuation() const
{
Q_D(const QPointLight);
return d->m_shaderData->property("linearAttenuation").toFloat();
}
void QPointLight::setLinearAttenuation(float value)
{
Q_D(QPointLight);
if (linearAttenuation() != value) {
d->m_shaderData->setProperty("linearAttenuation", value);
emit linearAttenuationChanged(value);
}
}
/*!
\qmlproperty float Qt3D.Render::PointLight::quadraticAttenuation
Specifies the quadratic attenuation of the point light
*/
/*!
\property Qt3DRender::QPointLight::quadraticAttenuation
Specifies the quadratic attenuation of the point light
*/
float QPointLight::quadraticAttenuation() const
{
Q_D(const QPointLight);
return d->m_shaderData->property("quadraticAttenuation").toFloat();
}
void QPointLight::setQuadraticAttenuation(float value)
{
Q_D(QPointLight);
if (quadraticAttenuation() != value) {
d->m_shaderData->setProperty("quadraticAttenuation", value);
emit quadraticAttenuationChanged(value);
}
}
} // namespace Qt3DRender
QT_END_NAMESPACE
|
