qt-everywhere-src-5.15.1/qtdeclarative/tests/auto/quick/qquickshadereffect/data/deleteShaderEffectSource.qml

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** This file is part of the test suite of the Qt Toolkit.
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import QtQuick 2.0
import QtQuick.Particles 2.0

Rectangle {
    color: "black"
    width: 320
    height: 320

    ShaderEffect {
        id: sei
        property variant source
    }

    ShaderEffectSource {
        id: doomed
        hideSource: true
        sourceItem: Image {
            source: "star.png"
        }
    }

    function setDeletedShaderEffectSource() {
        sei.source = doomed;
        doomed.destroy();
        // now set a fragment shader to trigger source texture detection.
        sei.fragmentShader = "varying highp vec2 qt_TexCoord0;\
                              uniform sampler2D source;\
                              uniform lowp float qt_Opacity;\
                              void main() {\
                                  gl_FragColor = texture2D(source, qt_TexCoord0) * qt_Opacity;\
                              }";
    }
}