Make runtime initialization optionally not block QML

Runtime initialization made non-blocking by offloading it to a worker
thread. This causes various object thread affinities in runtime
to be incorrect. This is relevant at least for the singaling,
where having affinity to non-existing initialization thread would
cause signals to not be delivered.
To work around this issue, signal proxy thread affinitions and
signal connections are set after initialization has completed.
Similarly, behavior script QML engine initialization is deferred
so that it can be done in correct thread.

Task-number: QT3DS-3805
Change-Id: Ie8b64f4ecd93e4c422e369e625080652d67bde27
Reviewed-by: Mahmoud Badri <mahmoud.badri@qt.io>
Reviewed-by: Tomi Korpipää <tomi.korpipaa@qt.io>

1 files changed, 94 insertions, 0 deletions

diff --git a/src/api/studio3dqml/q3dsruntimeInitializerthread_p.h b/src/api/studio3dqml/q3dsruntimeInitializerthread_p.h
new file mode 100644
index 0000000..42dcf67
--- /dev/null
+++ b/src/api/studio3dqml/q3dsruntimeInitializerthread_p.h
@@ -0,0 +1,94 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt 3D Studio.
+**
+** $QT_BEGIN_LICENSE:GPL$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 or (at your option) any later version
+** approved by the KDE Free Qt Foundation. The licenses are as published by
+** the Free Software Foundation and appearing in the file LICENSE.GPL3
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef Q3DS_RUNTIME_INITIALIZER_THEAD_H
+#define Q3DS_RUNTIME_INITIALIZER_THEAD_H
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the QtStudio3D API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#include "Qt3DSViewerApp.h"
+#include "q3dsstudio3d_p.h"
+
+#include <QtCore/qthread.h>
+#include <QtGui/qopenglframebufferobject.h>
+#include <QtGui/qsurfaceformat.h>
+#include <QtGui/qopenglcontext.h>
+#include <QtGui/qsurface.h>
+#include <QtQuick/qquickframebufferobject.h>
+
+QT_BEGIN_NAMESPACE
+
+class Q3DSRenderer;
+
+class Q3DSRuntimeInitializerThread : public QThread
+{
+    Q_OBJECT
+public:
+    Q3DSRuntimeInitializerThread(Q3DSViewer::Q3DSViewerApp *runtime,
+                                 int width, int height, const QSurfaceFormat &format,
+                                 int offscreenID, const QString &source,
+                                 const QStringList &variantList, bool delayedLoading,
+                                 qt3ds::Qt3DSAssetVisitor *assetVisitor, QOpenGLContext *context,
+                                 QSurface *surface);
+
+    void run() override;
+
+    bool wasSuccess() const { return m_success; }
+
+Q_SIGNALS:
+    void initDone();
+
+private:
+    Q3DSViewer::Q3DSViewerApp *m_runtime = nullptr;
+    Q3DSRenderer *m_renderer = nullptr;
+    int m_width = 0;
+    int m_height = 0;
+    QSurfaceFormat m_format;
+    int m_offscreenId = 0;
+    QString m_source;
+    QStringList m_variantList;
+    bool m_delayedLoading = false;
+    qt3ds::Qt3DSAssetVisitor *m_assetVisitor;
+    QOpenGLContext *m_context;
+    QSurface *m_surface;
+    bool m_success = false;
+};
+
+QT_END_NAMESPACE
+
+#endif // Q3DS_RUNTIME_INITIALIZER_THEAD_H