/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QML Shaders plugin 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 The Qt Company. For licensing terms
** and conditions see http://www.qt.io/terms-conditions. For further
** 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.
**
** 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.
**
** $QT_END_LICENSE$
**
****************************************************************************/

import QtQuick 1.0
import Qt.labs.shaders 1.0

 Rectangle {
     width: 300
     height: 300

     Text {
         id: textLabel
         text: "Hello World"
         anchors.centerIn: parent
         font.pixelSize: 48
     }

     ShaderEffectItem {
         objectName: "effectItem"
         property variant source: ShaderEffectSource { objectName: "effectSource"; sourceItem: textLabel; hideSource: true }
         property real wiggleAmount: 0.01
         anchors.fill: textLabel

         SequentialAnimation on wiggleAmount {
             loops: Animation.Infinite
             NumberAnimation { to: -0.01; duration: 500 }
             NumberAnimation { to: 0.01; duration: 500 }
         }

         fragmentShader: "
         varying highp vec2 qt_TexCoord0;
         uniform sampler2D source;
         uniform highp float wiggleAmount;
         void main(void)
         {
             highp vec2 wiggledTexCoord = qt_TexCoord0;
             wiggledTexCoord.s += sin(4.0 * 3.141592653589 * wiggledTexCoord.t) * wiggleAmount;
             gl_FragColor = texture2D(source, wiggledTexCoord.st);
         }
         "
     }
 }