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  1. Qt
  2. QTBUG-36556

Webkit fails to render propertly as a ShaderEffectSource

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    Details

    • Type: Bug
    • Status: Reported
    • Priority: P2: Important
    • Resolution: Unresolved
    • Affects Version/s: 5.2.0
    • Fix Version/s: None
    • Component/s: Quick: SceneGraph, WebKit
    • Labels:
      None

      Description

      Try the following code:

      You'll see flickering, bad rendering and even blank screens or teared content.

      Check out the comment for enabling and disabling.

       
      import QtQuick 2.2
      import QtWebKit 3.0
      
      Rectangle {
          width: 2000
          height: 500
      
          WebView{
              id: web
              url: "http://maps.google.com"
              anchors.fill: parent
          }
      
          Loader{
              id: loader
          }
          ShaderEffectSource{
              id: fxSource
              sourceItem: web
              //hideSource: true
              textureSize: Qt.size(512,512)
          }
          ShaderEffect {
              id: shader
              width: 500; height: 500
              property variant src: fxSource
              //visible: false  // <-----ENABLE/DISABLE THIS
              vertexShader: "
                          uniform highp mat4 qt_Matrix;
                          attribute highp vec4 qt_Vertex;
                          attribute highp vec2 qt_MultiTexCoord0;
                          varying highp vec2 coord;
                          void main() {
                              coord = qt_MultiTexCoord0;
                              gl_Position = qt_Matrix * qt_Vertex;
                          }"
              fragmentShader: "
                          varying highp vec2 coord;
                          uniform sampler2D src;
                          uniform lowp float qt_Opacity;
                          void main() {
                              lowp vec4 tex = texture2D(src, coord);
                              gl_FragColor = tex;
                          }"
              MouseArea{
                  drag.target: shader
                  drag.axis: Drag.XandYAxis
              }
          }
      }
      

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            People

            Assignee:
            sletta Gunnar Sletta
            Reporter:
            desert Ariel Molina R.
            Votes:
            1 Vote for this issue
            Watchers:
            6 Start watching this issue

              Dates

              Created:
              Updated:

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