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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the examples of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** This file may be used under the terms of the GNU Lesser General Public
** License version 2.1 as published by the Free Software Foundation and
** appearing in the file LICENSE.LGPL included in the packaging of this
** file. Please review the following information to ensure the GNU Lesser
** General Public License version 2.1 requirements will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt 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.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
import QtQuick 1.0
import Qt.labs.shaders 1.0
ShaderEffectItem {
id: effect
property real wave: 0.3
property real waveOriginX: 0.5
property real waveOriginY: 0.5
property real waveWidth: 0.01
property real aspectRatio: width/height
property variant source: 0
fragmentShader:
"
varying mediump vec2 qt_TexCoord0;
uniform sampler2D source;
uniform highp float wave;
uniform highp float waveWidth;
uniform highp float waveOriginX;
uniform highp float waveOriginY;
uniform highp float aspectRatio;
void main(void)
{
mediump vec2 texCoord2 = qt_TexCoord0;
mediump vec2 origin = vec2(waveOriginX, (1.0 - waveOriginY) / aspectRatio);
highp float fragmentDistance = distance(vec2(texCoord2.s, texCoord2.t / aspectRatio), origin);
highp float waveLength = waveWidth + fragmentDistance * 0.25;
if ( fragmentDistance > wave && fragmentDistance < wave + waveLength) {
highp float distanceFromWaveEdge = min(abs(wave - fragmentDistance), abs(wave + waveLength - fragmentDistance));
texCoord2 += sin(1.57075 * distanceFromWaveEdge / waveLength) * distanceFromWaveEdge * 0.08 / fragmentDistance;
}
gl_FragColor = texture2D(source, texCoord2.st);
}
"
}
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