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
|
// Copyright (C) 2019 Klaralvdalens Datakonsult AB (KDAB).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include <QGuiApplication>
#include <QTimer>
#include <QOpenGLContext>
#include <QWindow>
#include <qmath.h>
#include <Qt3DCore/QNode>
#include <Qt3DCore/QEntity>
#include <Qt3DCore/QTransform>
#include <Qt3DCore/QAspectEngine>
#include <Qt3DExtras/QTorusMesh>
#include <Qt3DExtras/QForwardRenderer>
#include <Qt3DExtras/QPhongMaterial>
#include <Qt3DRender/QCamera>
#include <Qt3DRender/QCameraLens>
#include <Qt3DRender/QCameraSelector>
#include <Qt3DRender/QMesh>
#include <Qt3DRender/QPointLight>
#include <Qt3DRender/QRenderAspect>
#include <Qt3DRender/QRenderSettings>
#include <Qt3DRender/QRenderSurfaceSelector>
#include <Qt3DRender/private/qrenderaspect_p.h>
#include <Qt3DRender/private/abstractrenderer_p.h>
class ManualRenderer
{
public:
ManualRenderer()
: m_aspectEngine(new Qt3DCore::QAspectEngine())
, m_renderAspect(new Qt3DRender::QRenderAspect(Qt3DRender::QRenderAspect::Manual))
, m_renderer(nullptr)
{
}
~ManualRenderer() {
m_aspectEngine->setRootEntity(Qt3DCore::QEntityPtr());
m_aspectEngine->unregisterAspect(m_renderAspect);
delete m_renderAspect;
delete m_aspectEngine;
}
void initialize(QWindow *window, QOpenGLContext *glCtx)
{
m_aspectEngine->registerAspect(m_renderAspect);
m_aspectEngine->setRunMode(Qt3DCore::QAspectEngine::Manual);
Qt3DRender::QRenderAspectPrivate *dRenderAspect = static_cast<decltype(dRenderAspect)>
(Qt3DRender::QRenderAspectPrivate::get(m_renderAspect));
m_renderer = dRenderAspect->m_renderer;
m_renderer->setOpenGLContext(glCtx);
m_renderer->initialize();
m_rootEntity.reset(createSceneTree(window));
m_aspectEngine->setRootEntity(m_rootEntity);
}
void render() {
qDebug() << Q_FUNC_INFO << "Updating Scene";
updateScene();
qDebug() << Q_FUNC_INFO << "Processing Frame";
// Launch jobs to process the frame
m_aspectEngine->processFrame();
qDebug() << Q_FUNC_INFO << "Rendering Frame";
// Submit Render Queues
m_renderer->render(true);
}
private:
Qt3DCore::QEntity *createSceneTree(QWindow *surface) {
// Root entity in the 3D scene.
Qt3DCore::QEntity *rootEntity = new Qt3DCore::QEntity;
auto camera = new Qt3DRender::QCamera(rootEntity);
camera->lens()->setPerspectiveProjection(45.0f, 16.0f/9.0f, 0.1f, 1000.0f);
camera->setPosition(QVector3D(0, 0, 40.0f));
camera->setViewCenter(QVector3D(0, 0, 0));
// Torus
Qt3DCore::QEntity *torusEntity = new Qt3DCore::QEntity(rootEntity);
auto material = new Qt3DExtras::QPhongMaterial(rootEntity);
auto torusTransform = new Qt3DCore::QTransform;
auto torusMesh = new Qt3DExtras::QTorusMesh;
torusMesh->setRadius(5);
torusMesh->setMinorRadius(1);
torusMesh->setRings(100);
torusMesh->setSlices(20);
torusTransform->setScale3D(QVector3D(1.5, 1, 0.5));
torusTransform->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(1, 0, 0), 45.0f));
torusEntity->addComponent(torusMesh);
torusEntity->addComponent(material);
torusEntity->addComponent(torusTransform);
// FrameGraph
auto forwardRenderer = new Qt3DExtras::QForwardRenderer();
forwardRenderer->setSurface(surface);
forwardRenderer->setCamera(camera);
forwardRenderer->setClearColor(QColor(Qt::black));
auto renderSettings = new Qt3DRender::QRenderSettings();
renderSettings->setActiveFrameGraph(forwardRenderer);
rootEntity->addComponent(renderSettings);
return rootEntity;
}
void updateScene()
{
static int angle = 0;
// Update camera position
auto camera = m_rootEntity->findChild<Qt3DRender::QCamera *>();
Q_ASSERT(camera);
const double angleRad = qDegreesToRadians(double(angle));
const QVector3D newPos(qSin(angleRad), 0.0, qCos(angleRad));
camera->setPosition(newPos * 40.0f);
qDebug() << Q_FUNC_INFO << "Camera Transform Matrix" << camera->transform()->matrix();
qDebug() << Q_FUNC_INFO << "Camera ViewMatrix" << camera->viewMatrix();
angle = (angle + 1) % 360;
}
Qt3DCore::QEntityPtr m_rootEntity;
Qt3DCore::QAspectEngine *m_aspectEngine;
Qt3DRender::QRenderAspect *m_renderAspect;
Qt3DRender::Render::AbstractRenderer *m_renderer;
};
int main(int ac, char **av)
{
QSurfaceFormat format = QSurfaceFormat::defaultFormat();
#if QT_CONFIG(opengles2)
format.setRenderableType(QSurfaceFormat::OpenGLES);
#else
if (QOpenGLContext::openGLModuleType() == QOpenGLContext::LibGL) {
format.setVersion(4, 3);
format.setProfile(QSurfaceFormat::CoreProfile);
}
#endif
format.setDepthBufferSize(24);
format.setSamples(4);
format.setStencilBufferSize(8);
QSurfaceFormat::setDefaultFormat(format);
QGuiApplication app(ac, av);
QWindow win;
win.setSurfaceType(QSurface::OpenGLSurface);
win.resize(1024, 768);
win.setFormat(format);
win.show();
QOpenGLContext ctx;
ctx.setFormat(format);
const bool ctxCreated = ctx.create();
if (!ctxCreated) {
qWarning() << "Failed to create GL context";
return -1;
}
ManualRenderer renderer;
renderer.initialize(&win, &ctx);
QTimer t;
QObject::connect(&t, &QTimer::timeout, [&] { renderer.render(); });
t.start(16);
return app.exec();
}
|
