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PORender Image into subclassed QDeclarativeItem using OpenGL
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copied!<p>I am trying to perform several image manipulations using OpenGL ES 2.0 and display the output into a subclassed QDeclarativeItem which will then be used within my QML GUI. I read through the answers found here: <a href="http://developer.qt.nokia.com/forums/viewthread/4109" rel="nofollow">http://developer.qt.nokia.com/forums/viewthread/4109</a> and succeeded in drawing a red-to-blue colored rectangle within my QML GUI by overriding the paint() methode of the QDeclarativeItem:</p> <pre><code>void GLDeclarativeItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget) { painter->beginNativePainting(); glBegin(GL_QUADS); glColor3ub(0,0,255); glVertex2d(0, 0); glVertex2d(0, height()); glColor3ub(255,0,0); glVertex2d(width(), height()); glVertex2d(width(), 0); glEnd(); painter->endNativePainting(); } </code></pre> <p>However, what I am trying to achieve is to draw the image which will be handled within my custom QGLWidget as the content of the above described QDeclarativeItem (instead of the red-to-blue colored content).</p> <p>Within my custom QGLWidget I am using:</p> <pre><code>void GLWidget::paintGL() { glClear(GL_COLOR_BUFFER_BIT); glDrawArrays(GL_TRIANGLE_STRIP, 0, 4); } </code></pre> <p>for drawing, which worked fine. However, I can not find the conversion between the drawing within my GLWidget and my GLDeclarativeItem. All the things I have tried so far just gave me a rectangle without any content at all. Thanks for your help!</p>

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