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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.
-**
-**
-** $QT_END_LICENSE$
-**
-****************************************************************************/
-
-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 }
- }
-}