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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 bool cached: false
property real horizontalOffset: 0.0
property real verticalOffset: 0.0
property real horizontalRadius: width
property real verticalRadius: height
property real angle: 0.0
property variant source
property Gradient gradient: Gradient {
GradientStop { position: 0.0; color: "white" }
GradientStop { position: 1.0; color: "black" }
}
SourceProxy {
id: maskSourceProxy
input: rootItem.source
}
ShaderEffectSource {
id: gradientSource
sourceItem: Rectangle {
width: 16
height: 256
gradient: rootItem.gradient
smooth: true
}
smooth: true
hideSource: true
visible: false
}
ShaderEffectSource {
id: cacheItem
anchors.fill: parent
visible: rootItem.cached
smooth: true
sourceItem: shaderItem
live: true
hideSource: visible
}
ShaderEffect {
id: shaderItem
property variant gradientImage: gradientSource
property variant maskSource: maskSourceProxy.output
property variant center: Qt.point(0.5 + rootItem.horizontalOffset / width, 0.5 + rootItem.verticalOffset / height)
property real horizontalRatio: rootItem.horizontalRadius > 0 ? width / (2 * rootItem.horizontalRadius) : width * 16384
property real verticalRatio: rootItem.verticalRadius > 0 ? height / (2 * rootItem.verticalRadius) : height * 16384
property real angle: -rootItem.angle / 360 * 2 * Math.PI
property variant matrixData: Qt.point(Math.sin(angle), Math.cos(angle))
anchors.fill: parent
vertexShader: "
attribute highp vec4 qt_Vertex;
attribute highp vec2 qt_MultiTexCoord0;
uniform highp mat4 qt_Matrix;
uniform highp vec2 matrixData;
uniform highp float horizontalRatio;
uniform highp float verticalRatio;
uniform highp vec2 center;
varying highp vec2 qt_TexCoord0;
varying highp vec2 qt_TexCoord1;
varying highp vec2 centerPoint;
void main() {
highp vec2 ratio = vec2(horizontalRatio, verticalRatio);
// Rotation matrix
highp mat2 rot = mat2(matrixData.y, -matrixData.x,
matrixData.x, matrixData.y);
qt_TexCoord0 = qt_MultiTexCoord0;
qt_TexCoord1 = qt_MultiTexCoord0;
qt_TexCoord1 -= center;
qt_TexCoord1 *= rot;
qt_TexCoord1 += center;
qt_TexCoord1 *= ratio;
centerPoint = center * ratio;
gl_Position = qt_Matrix * qt_Vertex;
}
"
fragmentShader: maskSource == undefined ? noMaskShader : maskShader
onFragmentShaderChanged: horizontalRatioChanged()
property string maskShader: "
uniform lowp sampler2D gradientImage;
uniform lowp sampler2D maskSource;
uniform lowp float qt_Opacity;
varying highp vec2 qt_TexCoord0;
varying highp vec2 qt_TexCoord1;
varying highp vec2 centerPoint;
void main() {
lowp vec4 gradientColor = texture2D(gradientImage, vec2(0.0, 2.0 * distance(qt_TexCoord1, centerPoint)));
lowp float maskAlpha = texture2D(maskSource, qt_TexCoord0).a;
gl_FragColor = gradientColor * maskAlpha * qt_Opacity;
}
"
property string noMaskShader: "
uniform lowp sampler2D gradientImage;
uniform lowp float qt_Opacity;
varying highp vec2 qt_TexCoord1;
varying highp vec2 centerPoint;
void main() {
lowp vec4 gradientColor = texture2D(gradientImage, vec2(0.0, 2.0 * distance(qt_TexCoord1, centerPoint)));
gl_FragColor = gradientColor * qt_Opacity;
}
"
}
}
|
