• Home

Component Showcase Demo App

 /****************************************************************************
 **
 ** Copyright (C) 2016 The Qt Company Ltd.
 ** Contact: https://www.qt.io/licensing/
 **
 ** This file is part of the Qt Mobility Components.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** 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 https://www.qt.io/terms-conditions. For further
 ** information use the contact form at https://www.qt.io/contact-us.
 **
 ** BSD License Usage
 ** Alternatively, you may use this file under the terms of the BSD license
 ** as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of The Qt Company Ltd nor the names of its
 **     contributors may be used to endorse or promote products derived
 **     from this software without specific prior written permission.
 **
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 // Based on http://www.geeks3d.com/20100909/shader-library-gaussian-blur-post-processing-filter-in-glsl/

 import QtQuick 2.0

 Item {
     id: root
     property bool divider: true
     property real dividerValue: 0.5
     property ListModel parameters: ListModel {
         ListElement {
             name: "Radius"
             value: 0.5
         }
         onDataChanged: updateBlurSize()
     }

     function updateBlurSize()
     {
         if ((targetHeight > 0) && (targetWidth > 0))
         {
             verticalBlurSize = 4.0 * parameters.get(0).value / targetHeight;
             horizontalBlurSize = 4.0 * parameters.get(0).value / targetWidth;
         }
     }

     property alias targetWidth: verticalShader.targetWidth
     property alias targetHeight: verticalShader.targetHeight
     property alias source: verticalShader.source
     property alias horizontalBlurSize: horizontalShader.blurSize
     property alias verticalBlurSize: verticalShader.blurSize

     Effect {
         id: verticalShader
         anchors.fill:  parent
         dividerValue: parent.dividerValue
         property real blurSize: 0.0

         onTargetHeightChanged: {
             updateBlurSize()
         }
         onTargetWidthChanged: {
             updateBlurSize()
         }
         fragmentShaderFilename: "gaussianblur_v.fsh"
     }

     Effect {
         id: horizontalShader
         anchors.fill: parent
         dividerValue: parent.dividerValue
         property real blurSize: 0.0
         fragmentShaderFilename: "gaussianblur_h.fsh"
         source: horizontalShaderSource

         ShaderEffectSource {
             id: horizontalShaderSource
             sourceItem: verticalShader
             smooth: true
             hideSource: true