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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Mobility Components.
**
** $QT_BEGIN_LICENSE:LGPL21$
** 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 http://www.qt.io/terms-conditions. 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 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** $QT_END_LICENSE$
**
****************************************************************************/
// 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: 1
property ListModel parameters: ListModel {
ListElement {
name: "radius"
value: 0.5
}
}
property alias targetWidth: verticalShader.targetWidth
property alias targetHeight: verticalShader.targetHeight
property alias source: verticalShader.source
Effect {
id: verticalShader
anchors.fill: parent
dividerValue: parent.dividerValue
property real blurSize: 4.0 * parent.parameters.get(0).value / targetHeight
fragmentShaderSrc: "uniform float dividerValue;
uniform float blurSize;
uniform sampler2D source;
uniform lowp float qt_Opacity;
varying vec2 qt_TexCoord0;
void main()
{
vec2 uv = qt_TexCoord0.xy;
vec4 c = vec4(0.0);
if (uv.x < dividerValue) {
c += texture2D(source, uv - vec2(0.0, 4.0*blurSize)) * 0.05;
c += texture2D(source, uv - vec2(0.0, 3.0*blurSize)) * 0.09;
c += texture2D(source, uv - vec2(0.0, 2.0*blurSize)) * 0.12;
c += texture2D(source, uv - vec2(0.0, 1.0*blurSize)) * 0.15;
c += texture2D(source, uv) * 0.18;
c += texture2D(source, uv + vec2(0.0, 1.0*blurSize)) * 0.15;
c += texture2D(source, uv + vec2(0.0, 2.0*blurSize)) * 0.12;
c += texture2D(source, uv + vec2(0.0, 3.0*blurSize)) * 0.09;
c += texture2D(source, uv + vec2(0.0, 4.0*blurSize)) * 0.05;
} else {
c = texture2D(source, qt_TexCoord0);
}
// First pass we don't apply opacity
gl_FragColor = c;
}"
}
Effect {
id: horizontalShader
anchors.fill: parent
dividerValue: parent.dividerValue
property real blurSize: 4.0 * parent.parameters.get(0).value / parent.targetWidth
fragmentShaderSrc: "uniform float dividerValue;
uniform float blurSize;
uniform sampler2D source;
uniform lowp float qt_Opacity;
varying vec2 qt_TexCoord0;
void main()
{
vec2 uv = qt_TexCoord0.xy;
vec4 c = vec4(0.0);
if (uv.x < dividerValue) {
c += texture2D(source, uv - vec2(4.0*blurSize, 0.0)) * 0.05;
c += texture2D(source, uv - vec2(3.0*blurSize, 0.0)) * 0.09;
c += texture2D(source, uv - vec2(2.0*blurSize, 0.0)) * 0.12;
c += texture2D(source, uv - vec2(1.0*blurSize, 0.0)) * 0.15;
c += texture2D(source, uv) * 0.18;
c += texture2D(source, uv + vec2(1.0*blurSize, 0.0)) * 0.15;
c += texture2D(source, uv + vec2(2.0*blurSize, 0.0)) * 0.12;
c += texture2D(source, uv + vec2(3.0*blurSize, 0.0)) * 0.09;
c += texture2D(source, uv + vec2(4.0*blurSize, 0.0)) * 0.05;
} else {
c = texture2D(source, qt_TexCoord0);
}
gl_FragColor = qt_Opacity * c;
}"
source: horizontalShaderSource
ShaderEffectSource {
id: horizontalShaderSource
sourceItem: verticalShader
smooth: true
hideSource: true
}
}
}
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