Can't get ShaderEffectItem to work, any suggestions?

BigPrimate

Hello -

I am trying to use the ShaderEffectItem. I downloaded, built and installed the shader plug in, however when I attempt to run it I get the following error:

ShaderEffectItem::paint - OpenGL not available

My QML is as follows:

@
import QtQuick 1.0
import QMLImage 1.0
import Qt.labs.shaders 1.0

Rectangle {
width: 300
height: 300
color: "black"

Text {
id: textLabel
text: "Hello World"
anchors.centerIn: parent
font.pixelSize: 32
color: "white"

}

ShaderEffectItem {
property variant source: ShaderEffectSource { sourceItem: textLabel; hideSource: true }
property real wiggleAmount: 0.005
anchors.fill: textLabel

fragmentShader: "
varying highp vec2 qt_TexCoord0;
uniform sampler2D source;
uniform highp float wiggleAmount;
void main(void)
{
highp vec2 wiggledTexCoord = qt_TexCoord0;
wiggledTexCoord.s += sin(4.0 * 3.141592653589 * wiggledTexCoord.t) * wiggleAmount;
gl_FragColor = texture2D(source, wiggledTexCoord.st);
}
"
}
}
@

I am including the reference to opengl in my qmlapplicationviewer.pri file like so:

QT += opengl

I also include:

#include <QtOpenGL>

in my header file.

Is there something else I have to do to get this to work?

Looking forward to your response.

BigPrimate

Found the answer myself, it turns out that in my main, I did not set the viewer viewport equal to a QGLWidget. The code below fixed by problem:
@
QGLFormat format = QGLFormat::defaultFormat();
format.setSampleBuffers(false);
format.setSwapInterval(1);
QGLWidget* glWidget = new QGLWidget(format);
glWidget->setAutoFillBackground(false);
viewer.setViewport(glWidget);
@