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/****************************************************************************
**
** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/
**
** This file is part of the Qt Graphical Effects module.
**
** $QT_BEGIN_LICENSE:BSD$
** 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 Nokia Corporation and its Subsidiary(-ies) 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."
**
** $QT_END_LICENSE$
**
****************************************************************************/
import QtQuick 2.0
import "private"
Item {
id: rootItem
property variant source
property variant displacementSource
property real displacement: 0.0
property bool cached: false
SourceProxy {
id: sourceProxy
input: rootItem.source
}
SourceProxy {
id: displacementSourceProxy
input: rootItem.displacementSource
}
ShaderEffectSource {
id: cacheItem
anchors.fill: parent
visible: rootItem.cached
smooth: true
sourceItem: shaderItem
live: true
hideSource: visible
}
ShaderEffect {
id: shaderItem
property variant source: sourceProxy.output
property variant displacementSource: displacementSourceProxy.output
property real displacement: rootItem.displacement
property real xPixel: 1.0/width
property real yPixel: 1.0/height
anchors.fill: parent
fragmentShader: "
varying highp vec2 qt_TexCoord0;
uniform highp float qt_Opacity;
uniform lowp sampler2D source;
uniform lowp sampler2D displacementSource;
uniform highp float displacement;
uniform highp float xPixel;
uniform highp float yPixel;
highp float linearstep(highp float e0, highp float e1, highp float x) {
return clamp((x - e0) / (e1 - e0), 0.0, 1.0);
}
void main() {
lowp vec4 offset = texture2D(displacementSource, qt_TexCoord0);
offset.xy -= vec2(0.5, 0.5);
offset.xy = offset.xy * step(vec2(1.0/256.0), abs(offset.xy));
highp vec2 tx = qt_TexCoord0 + (vec2(-offset.x, offset.y) * displacement);
lowp float e1 = linearstep(0.0, xPixel, tx.x);
lowp float e2 = linearstep(0.0, yPixel, tx.y);
lowp float e3 = 1.0 - linearstep(1.0, 1.0 + xPixel, tx.x);
lowp float e4 = 1.0 - linearstep(1.0, 1.0 + yPixel, tx.y);
lowp vec4 sample = texture2D(source, tx);
sample.rgb *= e1 * e2 * e3 * e4;
gl_FragColor = sample * qt_Opacity * offset.a;
}
"
}
}
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