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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://www.qt.io/licensing. 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 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.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
import QtQuick 2.0
Effect {
id: root
divider: false
parameters: ListModel {
ListElement {
name: "radius"
value: 0.5
}
ListElement {
name: "diffraction"
value: 0.5
}
}
property real posX: -1
property real posY: -1
QtObject {
id: d
property real oldTargetWidth: root.targetWidth
property real oldTargetHeight: root.targetHeight
}
// Transform slider values, and bind result to shader uniforms
property real radius: parameters.get(0).value * 100
property real diffractionIndex: parameters.get(1).value
onTargetWidthChanged: {
if (posX == -1)
posX = targetWidth / 2
else if (d.oldTargetWidth != 0)
posX *= (targetWidth / d.oldTargetWidth)
d.oldTargetWidth = targetWidth
}
onTargetHeightChanged: {
if (posY == -1)
posY = targetHeight / 2
else if (d.oldTargetHeight != 0)
posY *= (targetHeight / d.oldTargetHeight)
d.oldTargetHeight = targetHeight
}
fragmentShaderSrc: "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);
}"
MouseArea {
anchors.fill: parent
onPositionChanged: { root.posX = mouse.x; root.posY = root.targetHeight - mouse.y }
}
}
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