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** Copyright (C) 2016 The Qt Company Ltd.
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** This file is part of Qt for Device Creation.
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import QtQuick 2.0

ShaderEffect {
    id: root

    property variant source;

    property alias interval: shaderTrigger.interval
    property bool running: true;

    property real t: -1;
    NumberAnimation on t { id: shaderAnimation; from: -2;  to: 3; duration: 2000; loops: 1; running: false }

    Timer {
        id: shaderTrigger
        repeat: true
        interval: 10000
        running: visible && root.running;
        onTriggered: shaderAnimation.running = true
    }

    fragmentShader:
        "
            uniform lowp sampler2D source;
            uniform highp float t;
            uniform lowp float qt_Opacity;
            varying highp vec2 qt_TexCoord0;
            void main() {
                lowp vec4 p = texture2D(source, qt_TexCoord0) * qt_Opacity;
                highp float l = max(0.0, 1.0 - length(qt_TexCoord0.x + qt_TexCoord0.y - t));
                gl_FragColor = p + pow(l, 3.0) * p.w;
            }
            "
}