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
|
// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include <QApplication>
#include <QMainWindow>
#include <QScreen>
#include <QShortcut>
#include <QSurfaceFormat>
#include <QOpenGLContext>
#include <QOpenGLFunctions>
#include <QCommandLineParser>
#include <QCommandLineOption>
#include "mainwindow.h"
#include "glwidget.h"
#include <memory>
static QString getGlString(QOpenGLFunctions *functions, GLenum name)
{
if (const GLubyte *p = functions->glGetString(name))
return QString::fromLatin1(reinterpret_cast<const char *>(p));
return QString();
}
int main( int argc, char ** argv )
{
QApplication a( argc, argv );
QCoreApplication::setApplicationName("Qt Threaded QOpenGLWidget Example");
QCoreApplication::setOrganizationName("QtProject");
QCoreApplication::setApplicationVersion(QT_VERSION_STR);
QCommandLineParser parser;
parser.setApplicationDescription(QCoreApplication::applicationName());
parser.addHelpOption();
parser.addVersionOption();
QCommandLineOption singleOption("single", "Single thread");
parser.addOption(singleOption);
parser.process(a);
QSurfaceFormat format;
format.setDepthBufferSize(16);
QSurfaceFormat::setDefaultFormat(format);
// Two top-level windows with two QOpenGLWidget children in each.
// The rendering for the four QOpenGLWidgets happens on four separate threads.
GLWidget topLevelGlWidget;
QPoint pos = topLevelGlWidget.screen()->availableGeometry().topLeft() + QPoint(200, 200);
topLevelGlWidget.setWindowTitle(QStringLiteral("Threaded QOpenGLWidget example top level"));
topLevelGlWidget.resize(200, 200);
topLevelGlWidget.move(pos);
topLevelGlWidget.show();
auto *closeShortcut = new QShortcut(Qt::CTRL | Qt::Key_Q, &a, QApplication::closeAllWindows);
closeShortcut->setContext(Qt::ApplicationShortcut);
const QString glInfo = getGlString(topLevelGlWidget.context()->functions(), GL_VENDOR)
+ QLatin1Char('/') + getGlString(topLevelGlWidget.context()->functions(), GL_RENDERER);
const bool supportsThreading = !glInfo.contains(QLatin1String("nouveau"), Qt::CaseInsensitive)
&& !glInfo.contains(QLatin1String("ANGLE"), Qt::CaseInsensitive)
&& !glInfo.contains(QLatin1String("llvmpipe"), Qt::CaseInsensitive);
const QString toolTip = supportsThreading ? glInfo : glInfo + QStringLiteral("\ndoes not support threaded OpenGL.");
topLevelGlWidget.setToolTip(toolTip);
std::unique_ptr<MainWindow> mw1;
std::unique_ptr<MainWindow> mw2;
if (!parser.isSet(singleOption)) {
if (supportsThreading) {
pos += QPoint(100, 100);
mw1.reset(new MainWindow);
mw1->setToolTip(toolTip);
mw1->move(pos);
mw1->setWindowTitle(QStringLiteral("Threaded QOpenGLWidget example #1"));
mw1->show();
pos += QPoint(100, 100);
mw2.reset(new MainWindow);
mw2->setToolTip(toolTip);
mw2->move(pos);
mw2->setWindowTitle(QStringLiteral("Threaded QOpenGLWidget example #2"));
mw2->show();
} else {
qWarning() << toolTip;
}
}
return a.exec();
}
|
