1 files changed, 90 insertions, 0 deletions
diff --git a/examples/quick/quickwidgets/quickwidget/fbitem.cpp b/examples/quick/quickwidgets/quickwidget/fbitem.cpp
new file mode 100644
index 0000000000..fc2a4ea7ad
--- /dev/null
+++ b/examples/quick/quickwidgets/quickwidget/fbitem.cpp
@@ -0,0 +1,90 @@
+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the examples of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:BSD$
+** You may use this file under the terms of the BSD license as follows:
+**
+** "Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are
+** met:
+**   * Redistributions of source code must retain the above copyright
+**     notice, this list of conditions and the following disclaimer.
+**   * Redistributions in binary form must reproduce the above copyright
+**     notice, this list of conditions and the following disclaimer in
+**     the documentation and/or other materials provided with the
+**     distribution.
+**   * Neither the name of The Qt Company Ltd nor the names of its
+**     contributors may be used to endorse or promote products derived
+**     from this software without specific prior written permission.
+**
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "fbitem.h"
+#include <QtGui/QOpenGLFramebufferObject>
+#include <QtGui/QOpenGLContext>
+#include <QtGui/QOpenGLFunctions>
+#include <QtCore/QDebug>
+
+#ifndef QT_NO_OPENGL
+class FbRenderer : public QQuickFramebufferObject::Renderer
+{
+public:
+    FbRenderer() : c(0), dir(1) { }
+
+    // The lifetime of the FBO and this class depends on how QQuickWidget
+    // manages the scenegraph and context when it comes to showing and hiding
+    // the widget. The actual behavior is proven by the debug prints.
+    ~FbRenderer() {
+        qDebug("FbRenderer destroyed");
+    }
+
+    void render() {
+        QOpenGLFunctions *f = QOpenGLContext::currentContext()->functions();
+        f->glClearColor(c, 0, 0, 1);
+        f->glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT | GL_STENCIL_BUFFER_BIT);
+        c += 0.01f * dir;
+        if (c >= 1.0f || c <= 0.0f)
+            dir *= -1;
+        update();
+    }
+
+    QOpenGLFramebufferObject *createFramebufferObject(const QSize &size) {
+        qDebug() << "Creating FBO" << size;
+        QOpenGLFramebufferObjectFormat format;
+        format.setAttachment(QOpenGLFramebufferObject::CombinedDepthStencil);
+        return new QOpenGLFramebufferObject(size, format);
+    }
+
+private:
+    float c;
+    int dir;
+};
+#endif
+
+QQuickFramebufferObject::Renderer *FbItem::createRenderer() const
+{
+#ifndef QT_NO_OPENGL
+    return new FbRenderer;
+#else
+    return nullptr;
+#endif
+}