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+/****************************************************************************
+**
+** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Mobility Components.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 Digia. For licensing terms and
+** conditions see http://qt.digia.com/licensing. For further information
+** use the contact form at http://qt.digia.com/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 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, Digia gives you certain additional
+** rights. These rights are described in the Digia 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.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+// Based on http://www.reddit.com/r/programming/comments/losip/shader_toy/c2upn1e
+
+uniform sampler2D source;
+uniform lowp float qt_Opacity;
+varying vec2 qt_TexCoord0;
+uniform float radius;
+uniform float diffractionIndex;
+uniform float targetWidth;
+uniform float targetHeight;
+uniform float posX;
+uniform float posY;
+
+void main()
+{
+ vec2 tc = qt_TexCoord0;
+ vec2 center = vec2(posX, posY);
+ vec2 xy = gl_FragCoord.xy - center.xy;
+ float r = sqrt(xy.x * xy.x + xy.y * xy.y);
+ if (r < radius) {
+ float h = diffractionIndex * 0.5 * radius;
+ vec2 new_xy = r < radius ? xy * (radius - h) / sqrt(radius * radius - r * r) : xy;
+ vec2 targetSize = vec2(targetWidth, targetHeight);
+ tc = (new_xy + center) / targetSize;
+ tc.y = 1.0 - tc.y;
+ }
+ gl_FragColor = qt_Opacity * texture2D(source, tc);
+}