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diff --git a/res/effectlib/monoChannel.glsllib b/res/effectlib/monoChannel.glsllib
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+/****************************************************************************
+**
+** Copyright (C) 2014 NVIDIA Corporation.
+** Copyright (C) 2017 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 MONO_CHANNEL_GLSLLIB
+#define MONO_CHANNEL_GLSLLIB
+
+#ifdef QT3DS_DEFINE_API
+#define mono_alpha 0
+#define mono_average 1
+#define mono_luminance 2
+#define mono_maximum 3
+#endif
+
+float monoChannel( in vec4 t, in int monoSource )
+{
+  switch( monoSource )
+  {
+    case mono_alpha :
+      return( t.w );
+    case mono_average :
+      return( ( t.x + t.y + t.z ) / 3.0 );
+    case mono_luminance :
+      return( luminance( t.xyz ) );
+    case mono_maximum :
+      return( max( t.x, max( t.y, t.z ) ) );
+    default :
+      return( 1.0 );
+  }
+}
+
+#endif