Effect.qml Example File

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 import QtQuick 1.0
 import Qt.labs.shaders 1.0

 ShaderEffectItem {
     property variant source
     property ListModel parameters: ListModel { }
     property bool divider: true
     property real dividerValue: 0.5
     property real targetWidth: 0
     property real targetHeight: 0
     property string fragmentShaderFilename
     property string vertexShaderFilename

     QtObject {
         id: d
         property string fragmentShaderCommon: "
             #ifdef GL_ES
                 precision mediump float;
             #else
             #   define lowp
             #   define mediump
             #   define highp
             #endif // GL_ES
         "
     }

     // The following is a workaround for the fact that ShaderEffectItem
     // doesn't provide a way for shader programs to be read from a file,
     // rather than being inline in the QML file

     onFragmentShaderFilenameChanged:
         fragmentShader = d.fragmentShaderCommon + fileReader.readFile(fragmentShaderFilename)
     onVertexShaderFilenameChanged:
         vertexShader = fileReader.readFile(vertexShaderFilename)
 }