This is a shaderEffect codes from an example

Qt Code: 
  1. //   Shader Effect
  2.         ShaderEffect {
  3.             id: shaderEffect
  4.             anchors.fill: bug
  5.             property variant source: bug
  6.             property real amplitude: 0.01
  7.             property real frequency: 20
  8.             property real time: 0
  9.             NumberAnimation on time { loops: Animation.Infinite; from: 0; to: Math.PI * 2; duration: 600 }
  10.             fragmentShader:
  11.                 "uniform lowp float qt_Opacity;" +
  12.                 "uniform highp float amplitude;" +
  13.                 "uniform highp float frequency;" +
  14.                 "uniform highp float time;" +
  15.                 "uniform sampler2D source;" +
  16.                 "varying highp vec2 qt_TexCoord0;" +
  17.                 "void main() {" +
  18.                 "    highp vec2 p = sin(time + frequency * qt_TexCoord0);" +
  19.                 "    gl_FragColor = texture2D(source, qt_TexCoord0 + amplitude * vec2(p.y, -p.x)) * qt_Opacity;" +
  20.                 "}"
  21.         }
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I encapsulate it in a new component

Wobble.qml
Qt Code: 
  1. //   Shader Effect
  2.         ShaderEffect {
  3.             id: root
  4.  
  5.             property variant source
  6.             property real amplitude: 0.01
  7.             property real frequency: 20
  8.             property real time: 0
  9.             NumberAnimation on time { loops: Animation.Infinite; from: 0; to: Math.PI * 2; duration: 600 }
  10.             fragmentShader:
  11.                 "uniform lowp float qt_Opacity;" +
  12.                 "uniform highp float amplitude;" +
  13.                 "uniform highp float frequency;" +
  14.                 "uniform highp float time;" +
  15.                 "uniform sampler2D source;" +
  16.                 "varying highp vec2 qt_TexCoord0;" +
  17.                 "void main() {" +
  18.                 "    highp vec2 p = sin(time + frequency * qt_TexCoord0);" +
  19.                 "    gl_FragColor = texture2D(source, qt_TexCoord0 + amplitude * vec2(p.y, -p.x)) * qt_Opacity;" +
  20.                 "}"
  21.         }
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And I use it like this

main.qml

Qt Code: 
  1. import QtQuick 2.0
  2.  
  3.     Rectangle {
  4.         width : bug.width
  5.         height : bug.height
  6.  
  7.         Image{
  8.             id: bug
  9.  
  10.             anchors.fill: parent
  11.  
  12.             source: "/Downloads/1359170070532.jpg"
  13.             smooth: true
  14.             fillMode: Image.PreserveAspectFit
  15.         }    
  16.  
  17.         Wobble{
  18.             id: wobble
  19.  
  20.             anchors.fill: bug
  21.             source: bug
  22.         }
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However, it can’t work, if I replace Wobble by the original ShaderEffect, it works
What am I miss?Besides, do we have a solution to pass uniform array by qml?

ex:

Qt Code: 
  1. //.....
  2.     uniform vec2 offset[9];
  3.  
  4.     uniform int kernel[9];
  5.  
  6.     //......
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