1/****************************************************************************
2**
3** Copyright (C) 2017 The Qt Company Ltd.
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the examples of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:BSD$
9** Commercial License Usage
10** Licensees holding valid commercial Qt licenses may use this file in
11** accordance with the commercial license agreement provided with the
12** Software or, alternatively, in accordance with the terms contained in
13** a written agreement between you and The Qt Company. For licensing terms
14** and conditions see https://www.qt.io/terms-conditions. For further
15** information use the contact form at https://www.qt.io/contact-us.
16**
17** BSD License Usage
18** Alternatively, you may use this file under the terms of the BSD license
19** as follows:
20**
21** "Redistribution and use in source and binary forms, with or without
22** modification, are permitted provided that the following conditions are
23** met:
24** * Redistributions of source code must retain the above copyright
25** notice, this list of conditions and the following disclaimer.
26** * Redistributions in binary form must reproduce the above copyright
27** notice, this list of conditions and the following disclaimer in
28** the documentation and/or other materials provided with the
29** distribution.
30** * Neither the name of The Qt Company Ltd nor the names of its
31** contributors may be used to endorse or promote products derived
32** from this software without specific prior written permission.
33**
34**
35** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
36** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
37** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
38** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
39** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
42** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
43** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
44** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
45** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
46**
47** $QT_END_LICENSE$
48**
49****************************************************************************/
50
51#include "camera.h"
52
53Camera::Camera(const QVector3D &pos)
54 : m_forward(0.0f, 0.0f, -1.0f),
55 m_right(1.0f, 0.0f, 0.0f),
56 m_up(0.0f, 1.0f, 0.0f),
57 m_pos(pos),
58 m_yaw(0.0f),
59 m_pitch(0.0f)
60{
61}
62
63static inline void clamp360(float *v)
64{
65 if (*v > 360.0f)
66 *v -= 360.0f;
67 if (*v < -360.0f)
68 *v += 360.0f;
69}
70
71void Camera::yaw(float degrees)
72{
73 m_yaw += degrees;
74 clamp360(v: &m_yaw);
75 m_yawMatrix.setToIdentity();
76 m_yawMatrix.rotate(angle: m_yaw, x: 0, y: 1, z: 0);
77
78 QMatrix4x4 rotMat = m_pitchMatrix * m_yawMatrix;
79 m_forward = (QVector4D(0.0f, 0.0f, -1.0f, 0.0f) * rotMat).toVector3D();
80 m_right = (QVector4D(1.0f, 0.0f, 0.0f, 0.0f) * rotMat).toVector3D();
81}
82
83void Camera::pitch(float degrees)
84{
85 m_pitch += degrees;
86 clamp360(v: &m_pitch);
87 m_pitchMatrix.setToIdentity();
88 m_pitchMatrix.rotate(angle: m_pitch, x: 1, y: 0, z: 0);
89
90 QMatrix4x4 rotMat = m_pitchMatrix * m_yawMatrix;
91 m_forward = (QVector4D(0.0f, 0.0f, -1.0f, 0.0f) * rotMat).toVector3D();
92 m_up = (QVector4D(0.0f, 1.0f, 0.0f, 0.0f) * rotMat).toVector3D();
93}
94
95void Camera::walk(float amount)
96{
97 m_pos[0] += amount * m_forward.x();
98 m_pos[2] += amount * m_forward.z();
99}
100
101void Camera::strafe(float amount)
102{
103 m_pos[0] += amount * m_right.x();
104 m_pos[2] += amount * m_right.z();
105}
106
107QMatrix4x4 Camera::viewMatrix() const
108{
109 QMatrix4x4 m = m_pitchMatrix * m_yawMatrix;
110 m.translate(vector: -m_pos);
111 return m;
112}
113

source code of qtbase/examples/vulkan/hellovulkancubes/camera.cpp