1/****************************************************************************
2**
3** Copyright (C) 2016 Paul Lemire
4** Contact: https://www.qt.io/licensing/
5**
6** This file is part of the Qt3D module of the Qt Toolkit.
7**
8** $QT_BEGIN_LICENSE:LGPL$
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** GNU Lesser General Public License Usage
18** Alternatively, this file may be used under the terms of the GNU Lesser
19** General Public License version 3 as published by the Free Software
20** Foundation and appearing in the file LICENSE.LGPL3 included in the
21** packaging of this file. Please review the following information to
22** ensure the GNU Lesser General Public License version 3 requirements
23** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
24**
25** GNU General Public License Usage
26** Alternatively, this file may be used under the terms of the GNU
27** General Public License version 2.0 or (at your option) the GNU General
28** Public license version 3 or any later version approved by the KDE Free
29** Qt Foundation. The licenses are as published by the Free Software
30** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
31** included in the packaging of this file. Please review the following
32** information to ensure the GNU General Public License requirements will
33** be met: https://www.gnu.org/licenses/gpl-2.0.html and
34** https://www.gnu.org/licenses/gpl-3.0.html.
35**
36** $QT_END_LICENSE$
37**
38****************************************************************************/
39
40#include "frustumcullingjob_p.h"
41#include <Qt3DRender/private/job_common_p.h>
42#include <Qt3DRender/private/managers_p.h>
43#include <Qt3DRender/private/entity_p.h>
44#include <Qt3DRender/private/renderview_p.h>
45#include <Qt3DRender/private/sphere_p.h>
46#include <Qt3DRender/private/managers_p.h>
47#include <Qt3DRender/private/nodemanagers_p.h>
48
49QT_BEGIN_NAMESPACE
50
51namespace Qt3DRender {
52
53namespace Render {
54
55FrustumCullingJob::FrustumCullingJob()
56 : Qt3DCore::QAspectJob()
57 , m_root(nullptr)
58 , m_manager(nullptr)
59 , m_active(false)
60{
61 SET_JOB_RUN_STAT_TYPE(this, JobTypes::FrustumCulling, 0);
62}
63
64void FrustumCullingJob::run()
65{
66 // Early return if not activated
67 if (!m_active)
68 return;
69
70 m_visibleEntities.clear();
71
72 const Plane planes[6] = {
73 Plane(m_viewProjection.row(3) + m_viewProjection.row(0)), // Left
74 Plane(m_viewProjection.row(3) - m_viewProjection.row(0)), // Right
75 Plane(m_viewProjection.row(3) + m_viewProjection.row(1)), // Top
76 Plane(m_viewProjection.row(3) - m_viewProjection.row(1)), // Bottom
77 Plane(m_viewProjection.row(3) + m_viewProjection.row(2)), // Front
78 Plane(m_viewProjection.row(3) - m_viewProjection.row(2)), // Back
79 };
80
81 cullScene(m_root, planes);
82
83 // sort needed for set_intersection in RenderViewBuilder
84 std::sort(m_visibleEntities.begin(), m_visibleEntities.end());
85}
86
87void FrustumCullingJob::cullScene(Entity *e, const Plane *planes)
88{
89 e->traverse([planes, this](Entity *e) {
90 const Sphere *s = e->worldBoundingVolumeWithChildren();
91
92 // Unrolled loop
93 if (Vector3D::dotProduct(s->center(), planes[0].normal) + planes[0].d < -s->radius())
94 return;
95 if (Vector3D::dotProduct(s->center(), planes[1].normal) + planes[1].d < -s->radius())
96 return;
97 if (Vector3D::dotProduct(s->center(), planes[2].normal) + planes[2].d < -s->radius())
98 return;
99 if (Vector3D::dotProduct(s->center(), planes[3].normal) + planes[3].d < -s->radius())
100 return;
101 if (Vector3D::dotProduct(s->center(), planes[4].normal) + planes[4].d < -s->radius())
102 return;
103 if (Vector3D::dotProduct(s->center(), planes[5].normal) + planes[5].d < -s->radius())
104 return;
105
106 m_visibleEntities.push_back(e);
107 });
108}
109
110} // Render
111
112} // Qt3DRender
113
114QT_END_NAMESPACE
115