RenderLayer monitoring frontend QLayer

Change-Id: Id225f324486cd7e0b34fc00461a6907f152883e8
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

3 files changed, 191 insertions, 2 deletions

diff --git a/src/render/backend/render-backend.pri b/src/render/backend/render-backend.pri
index 48e53ed6b..5182e2891 100644
--- a/src/render/backend/render-backend.pri
+++ b/src/render/backend/render-backend.pri
@@ -45,7 +45,8 @@ HEADERS += \
     $$PWD/renderpassmanager.h \
     $$PWD/parameterpack.h \
     $$PWD/texturemanager.h \
-    $$PWD/texturedatamanager.h
+    $$PWD/texturedatamanager.h \
+    $$PWD/renderlayer.h
 
 SOURCES += \
     $$PWD/rendereraspect.cpp \
@@ -87,4 +88,5 @@ SOURCES += \
     $$PWD/renderpassmanager.cpp \
     $$PWD/parameterpack.cpp \
     $$PWD/texturemanager.cpp \
-    $$PWD/texturedatamanager.cpp
+    $$PWD/texturedatamanager.cpp \
+    $$PWD/renderlayer.cpp
diff --git a/src/render/backend/renderlayer.cpp b/src/render/backend/renderlayer.cpp
new file mode 100644
index 000000000..602f96bd1
--- /dev/null
+++ b/src/render/backend/renderlayer.cpp
@@ -0,0 +1,105 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "renderlayer.h"
+#include "renderer.h"
+#include "rendereraspect.h"
+#include "qlayer.h"
+#include <Qt3DCore/qaspectmanager.h>
+#include <Qt3DCore/qchangearbiter.h>
+#include <Qt3DCore/qscenepropertychange.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3D {
+
+namespace Render {
+
+RenderLayer::RenderLayer()
+    : m_peer(Q_NULLPTR)
+    , m_renderer(Q_NULLPTR)
+{
+}
+
+RenderLayer::~RenderLayer()
+{
+    if (m_peer) {
+        QChangeArbiter *arbiter = m_renderer->rendererAspect()->aspectManager()->changeArbiter();
+        arbiter->unregisterObserver(this, m_peer);
+    }
+}
+
+void RenderLayer::setPeer(QLayer *peer)
+{
+    if (m_peer != peer) {
+        QChangeArbiter *arbiter = m_renderer->rendererAspect()->aspectManager()->changeArbiter();
+        if (m_peer)
+            arbiter->unregisterObserver(this, m_peer);
+        m_peer = peer;
+        if (m_peer) {
+            arbiter->registerObserver(this, m_peer, ComponentUpdated);
+            m_layer = m_peer->name();
+        }
+    }
+}
+
+void RenderLayer::setRenderer(Renderer *renderer)
+{
+    m_renderer = renderer;
+}
+
+QString RenderLayer::layer() const
+{
+    return m_layer;
+}
+
+void RenderLayer::sceneChangeEvent(const QSceneChangePtr &e)
+{
+    QScenePropertyChangePtr propertyChange = qSharedPointerCast<QScenePropertyChange>(e);
+    if (e->m_type == ComponentUpdated && propertyChange->m_propertyName == QByteArrayLiteral("layer"))
+        m_layer = propertyChange->m_value.toString();
+}
+
+} // Render
+
+} // Qt3D
+
+QT_END_NAMESPACE
diff --git a/src/render/backend/renderlayer.h b/src/render/backend/renderlayer.h
new file mode 100644
index 000000000..0e6458434
--- /dev/null
+++ b/src/render/backend/renderlayer.h
@@ -0,0 +1,82 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QT3D_RENDER_RENDERLAYER_H
+#define QT3D_RENDER_RENDERLAYER_H
+
+#include <Qt3DRenderer/qt3drenderer_global.h>
+#include <Qt3DCore/qobserverinterface.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace Qt3D {
+
+class QLayer;
+
+namespace Render {
+
+class Renderer;
+
+class RenderLayer : public QObserverInterface
+{
+public:
+    RenderLayer();
+    ~RenderLayer();
+
+    void setPeer(QLayer *peer);
+    void setRenderer(Renderer *renderer);
+
+    QString layer() const;
+    void sceneChangeEvent(const QSceneChangePtr &e);
+
+private:
+    QLayer *m_peer;
+    Renderer *m_renderer;
+    QString m_layer;
+};
+
+} // Render
+
+} // Qt3D
+
+QT_END_NAMESPACE
+
+#endif // QT3D_RENDER_RENDERLAYER_H