Convenience to locate QRenderSurfaceSelector

This is in fact done at several places nowadays, sometimes with bugs, so
let's provide a single tested implementation for it.

Change-Id: I782ba18a15e5b4a3b320ac6b472173b1f8e417a3
Reviewed-by: Sean Harmer <sean.harmer@kdab.com>

3 files changed, 119 insertions, 1 deletions

diff --git a/tests/auto/render/qrendersurfaceselector/qrendersurfaceselector.pro b/tests/auto/render/qrendersurfaceselector/qrendersurfaceselector.pro
new file mode 100644
index 000000000..57626b9ef
--- /dev/null
+++ b/tests/auto/render/qrendersurfaceselector/qrendersurfaceselector.pro
@@ -0,0 +1,10 @@
+TEMPLATE = app
+
+TARGET = tst_qrendersurfaceselector
+QT += core-private 3dcore 3dcore-private 3drender 3drender-private testlib
+
+CONFIG += testcase
+
+SOURCES += tst_qrendersurfaceselector.cpp
+
+include(../commons/commons.pri)
diff --git a/tests/auto/render/qrendersurfaceselector/tst_qrendersurfaceselector.cpp b/tests/auto/render/qrendersurfaceselector/tst_qrendersurfaceselector.cpp
new file mode 100644
index 000000000..17c7cf40d
--- /dev/null
+++ b/tests/auto/render/qrendersurfaceselector/tst_qrendersurfaceselector.cpp
@@ -0,0 +1,107 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 Klaralvdalens Datakonsult AB (KDAB).
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of the Qt3D module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:GPL-EXCEPT$
+** 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 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** 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.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include <QtTest/QTest>
+#include <Qt3DCore/qentity.h>
+
+#include <Qt3DRender/qrendersettings.h>
+#include <Qt3DRender/qrendersurfaceselector.h>
+#include <Qt3DRender/private/qrendersurfaceselector_p.h>
+
+class tst_QRenderSurfaceSelector: public QObject
+{
+    Q_OBJECT
+
+private Q_SLOTS:
+    void shouldFindInstanceInEntityTree_data()
+    {
+        QTest::addColumn<QSharedPointer<Qt3DCore::QEntity>>("root");
+        QTest::addColumn<Qt3DRender::QRenderSurfaceSelector*>("expected");
+
+        auto root = QSharedPointer<Qt3DCore::QEntity>::create();
+        auto settings = new Qt3DRender::QRenderSettings;
+        root->addComponent(settings);
+        auto selector = new Qt3DRender::QRenderSurfaceSelector;
+        settings->setActiveFrameGraph(selector);
+        QTest::newRow("simplest_tree") << root << selector;
+
+        root = QSharedPointer<Qt3DCore::QEntity>::create();
+        settings = new Qt3DRender::QRenderSettings;
+        root->addComponent(settings);
+        settings->setActiveFrameGraph(new Qt3DRender::QFrameGraphNode);
+        selector = nullptr;
+        QTest::newRow("no_selector") << root << selector;
+
+        root = QSharedPointer<Qt3DCore::QEntity>::create();
+        settings = new Qt3DRender::QRenderSettings;
+        root->addComponent(settings);
+        selector = nullptr;
+        QTest::newRow("no_framegraph") << root << selector;
+
+        root = QSharedPointer<Qt3DCore::QEntity>::create();
+        selector = nullptr;
+        QTest::newRow("no_rendersettings") << root << selector;
+
+        root = QSharedPointer<Qt3DCore::QEntity>::create();
+        auto entity = new Qt3DCore::QEntity(root.data());
+        entity = new Qt3DCore::QEntity(entity);
+        settings = new Qt3DRender::QRenderSettings;
+        entity->addComponent(settings);
+        selector = new Qt3DRender::QRenderSurfaceSelector;
+        settings->setActiveFrameGraph(selector);
+        QTest::newRow("in_subentity") << root << selector;
+
+        root = QSharedPointer<Qt3DCore::QEntity>::create();
+        entity = new Qt3DCore::QEntity(root.data());
+        entity = new Qt3DCore::QEntity(entity);
+        settings = new Qt3DRender::QRenderSettings;
+        entity->addComponent(settings);
+        auto node = new Qt3DRender::QFrameGraphNode;
+        settings->setActiveFrameGraph(node);
+        node = new Qt3DRender::QFrameGraphNode(node);
+        selector = new Qt3DRender::QRenderSurfaceSelector(node);
+        QTest::newRow("in_deeper_framegraph") << root << selector;
+    }
+
+    void shouldFindInstanceInEntityTree()
+    {
+        // GIVEN
+        QFETCH(QSharedPointer<Qt3DCore::QEntity>, root);
+
+        // WHEN
+        auto selector = Qt3DRender::QRenderSurfaceSelectorPrivate::find(root.data());
+
+        // THEN
+        QFETCH(Qt3DRender::QRenderSurfaceSelector*, expected);
+        QCOMPARE(selector, expected);
+    }
+};
+
+QTEST_MAIN(tst_QRenderSurfaceSelector)
+
+#include "tst_qrendersurfaceselector.moc"
diff --git a/tests/auto/render/render.pro b/tests/auto/render/render.pro
index bfd2abe09..7cd682e13 100644
--- a/tests/auto/render/render.pro
+++ b/tests/auto/render/render.pro
@@ -49,5 +49,6 @@ contains(QT_CONFIG, private_tests) {
         layerfiltering \
         filterentitybycomponent \
         genericlambdajob \
-        qgraphicsapifilter
+        qgraphicsapifilter \
+        qrendersurfaceselector
 }