Add NV12/NV21 support into SG videonode.

Add new fragment shaders and update declarative render (video node) to support NV12/NV21
pixel format.

Task-number: QTBUG-45021
Change-Id: I5d52007f0da56165752268d06efca156f7496b42
Reviewed-by: Yoann Lopes <yoann.lopes@theqtcompany.com>

src/qtmultimediaquicktools/qsgvideonode_yuv.h

@@ -0,0 +1,72 @@
+/****************************************************************************
+**
+** Copyright (C) 2015 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** 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
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+** information use the contact form at http://www.qt.io/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 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** As a special exception, The Qt Company gives you certain additional
+** rights. These rights are described in The Qt Company LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
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+****************************************************************************/
+
+#ifndef QSGVIDEONODE_YUV_H
+#define QSGVIDEONODE_YUV_H
+
+#include <private/qsgvideonode_p.h>
+#include <QtMultimedia/qvideosurfaceformat.h>
+
+QT_BEGIN_NAMESPACE
+
+class QSGVideoMaterial_YUV;
+class QSGVideoNode_YUV : public QSGVideoNode
+{
+public:
+    QSGVideoNode_YUV(const QVideoSurfaceFormat &format);
+    ~QSGVideoNode_YUV();
+
+    virtual QVideoFrame::PixelFormat pixelFormat() const {
+        return m_format.pixelFormat();
+    }
+    QAbstractVideoBuffer::HandleType handleType() const {
+        return QAbstractVideoBuffer::NoHandle;
+    }
+    void setCurrentFrame(const QVideoFrame &frame, FrameFlags flags);
+
+private:
+    void bindTexture(int id, int unit, int w, int h, const uchar *bits);
+
+    QVideoSurfaceFormat m_format;
+    QSGVideoMaterial_YUV *m_material;
+};
+
+class QSGVideoNodeFactory_YUV : public QSGVideoNodeFactoryInterface {
+public:
+    QList<QVideoFrame::PixelFormat> supportedPixelFormats(QAbstractVideoBuffer::HandleType handleType) const;
+    QSGVideoNode *createNode(const QVideoSurfaceFormat &format);
+};
+
+QT_END_NAMESPACE
+
+#endif // QSGVIDEONODE_YUV_H