qt-everywhere-src-5.14.1/qtwebengine/src/core/api/qtwebenginecoreglobal.cpp

/****************************************************************************
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** This file is part of the QtWebEngine module of the Qt Toolkit.
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#include "qtwebenginecoreglobal_p.h"

#include <QGuiApplication>
#ifndef QT_NO_OPENGL
# include <QOpenGLContext>
#ifdef Q_OS_MACOS
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
#endif
#include <QThread>

#ifndef QT_NO_OPENGL
QT_BEGIN_NAMESPACE
Q_GUI_EXPORT void qt_gl_set_global_share_context(QOpenGLContext *context);
Q_GUI_EXPORT QOpenGLContext *qt_gl_global_share_context();
QT_END_NAMESPACE
#endif

#ifndef QT_NO_OPENGL
#ifdef Q_OS_MACOS
static bool needsOfflineRendererWorkaround()
{
    size_t hwmodelsize = 0;

    if (sysctlbyname("hw.model", nullptr, &hwmodelsize, nullptr, 0) == -1)
        return false;

    char hwmodel[hwmodelsize];
    if (sysctlbyname("hw.model", &hwmodel, &hwmodelsize, nullptr, 0) == -1)
        return false;

    return QString::fromLatin1(hwmodel) == QLatin1String("MacPro6,1");
}
#endif
#endif

namespace QtWebEngineCore {
#ifndef QT_NO_OPENGL
static QOpenGLContext *shareContext;

static void deleteShareContext()
{
    if (qt_gl_global_share_context() == shareContext)
        qt_gl_set_global_share_context(nullptr);
    delete shareContext;
    shareContext = 0;
}

#endif
// ### Qt 6: unify this logic and Qt::AA_ShareOpenGLContexts.
// QtWebEngine::initialize was introduced first and meant to be called
// after the QGuiApplication creation, when AA_ShareOpenGLContexts fills
// the same need but the flag has to be set earlier.

Q_WEBENGINECORE_PRIVATE_EXPORT void initialize()
{
#ifndef QT_NO_OPENGL
#ifdef Q_OS_WIN32
    qputenv("QT_D3DCREATE_MULTITHREADED", "1");
#endif
#ifdef Q_OS_MACOS
    if (needsOfflineRendererWorkaround())
        qputenv("QT_MAC_PRO_WEBENGINE_WORKAROUND", "1");
#endif
    // No need to override the shared context if QApplication already set one (e.g with Qt::AA_ShareOpenGLContexts).
    if (qt_gl_global_share_context())
        return;

    QCoreApplication *app = QCoreApplication::instance();
    if (!app) {
        qFatal("QtWebEngine::initialize() but no core application instance.");
        return;
    }

    // Bail out silently if the user did not construct a QGuiApplication.
    if (!qobject_cast<QGuiApplication *>(app))
        return;

    if (app->thread() != QThread::currentThread()) {
        qFatal("QtWebEngine::initialize() must be called from the Qt gui thread.");
        return;
    }

    if (shareContext)
        return;

    shareContext = new QOpenGLContext;
    QSurfaceFormat format = QSurfaceFormat::defaultFormat();
//     format.setOption(QSurfaceFormat::ResetNotification);
    shareContext->setFormat(format);
    shareContext->create();
    qAddPostRoutine(deleteShareContext);
    qt_gl_set_global_share_context(shareContext);

    // Classes like QOpenGLWidget check for the attribute
    app->setAttribute(Qt::AA_ShareOpenGLContexts);
#endif // QT_NO_OPENGL
}
} // namespace QtWebEngineCore