Revision control
++ // Copyright (C) 2016 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 "offscreensurfacehelper_p.h"
++
++ #include <Qt3DRender/private/abstractrenderer_p.h>
++ #include <QtGui/qoffscreensurface.h>
++ #include <QtGui/qsurfaceformat.h>
++ #include <QtCore/qcoreapplication.h>
++ #include <QtCore/qthread.h>
++
++ QT_BEGIN_NAMESPACE
++
++ namespace Qt3DRender {
++ namespace Render {
++
++ /*! \internal */
++ OffscreenSurfaceHelper::OffscreenSurfaceHelper(AbstractRenderer *renderer,
++ QObject *parent)
++ : QObject(parent)
++ , m_renderer(renderer)
++ , m_offscreenSurface(nullptr)
++ {
++ Q_ASSERT(renderer);
++ }
++
++ /*!
++ * \internal
++ * Called in context of main thread to create an offscreen surface
++ * which can later be made current with the Qt 3D OpenGL context to
++ * then allow graphics resources to be released cleanly.
++ */
++ void OffscreenSurfaceHelper::createOffscreenSurface()
++ {
++ Q_ASSERT(QThread::currentThread() == QCoreApplication::instance()->thread());
++ m_offscreenSurface = new QOffscreenSurface;
++ m_offscreenSurface->setParent(this);
++ m_offscreenSurface->setFormat(m_renderer->format());
++ m_offscreenSurface->setScreen(m_renderer->screen());
++ m_offscreenSurface->create();
++ }
++
++ } // namespace Render
++ } // namespace Qt3DRender
++
++ QT_END_NAMESPACE
++
++ #include "moc_offscreensurfacehelper_p.cpp"