qt-everywhere-src-5.14.1/qtmultimedia/examples/multimedia/video/qmlvideofx/qml/qmlvideofx/EffectIsolate.qml

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import QtQuick 2.0

Effect {
    parameters: ListModel {
        ListElement {
            name: "Hue"
            value: 0.5
        }
        ListElement {
            name: "Width"
            value: 0.5
        }
        onDataChanged: updateParameters()
    }

    function updateParameters()
    {
        targetHue   = parameters.get(0).value * 360
        windowWidth = parameters.get(1).value * 60
    }

    // Transform slider values, and bind result to shader uniforms
    property real targetHue: 0.5 * 360
    property real windowWidth: 0.5 * 60

    fragmentShaderFilename: "isolate.fsh"
}