Qt-interest Archive, May 2007
QGLPixelBuffer Update Problem
Message 1 in thread
Has anyone worked with a QGLPixelBuffer outside of a
QGLWidget::paintGL() method? I'm using one to draw an image from data
received over the network. The image is then rendered in the paintGL
() method of the main thread. Everything works great if I do NOT call
QGLPixelBuffer::bindToDynamicTexture(); if I do, I get no image. Note
that the rendering of the network data into the QGLPixelBuffer does
not occur from within my paintGL() routine.
Playing around with the pbuffers demo program, I can get the same
behavior if I move out the pbuffer update from the paintGL() routine
and instead trigger it from a QTimer: the pbuffer does not update.
Any hints or ideas? I'd try QGLFramebuffer, but that is not supported
on my box right now.
Thanks,
Brad
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Message 2 in thread
Hi Brad,
> Has anyone worked with a QGLPixelBuffer outside of a QGLWidget::paintGL()
> method? I'm using one to draw an image from data received over the
network.
> The image is then rendered in the paintGL() method of the main thread.
> Everything works great if I do NOT call
> QGLPixelBuffer::bindToDynamicTexture(); if I do, I get no image. Note that
> the rendering of the network data into the QGLPixelBuffer does not occur
> from within my paintGL() routine.
I assume you need a call to QGLWidget::makeCurrent (or whatever its Qt4
equivalent is called) in order to do GL stuff outside of paintGL.
> Playing around with the pbuffers demo program, I can get the same behavior
> if I move out the pbuffer update from the paintGL() routine and instead
> trigger it from a QTimer: the pbuffer does not update. Any hints or ideas?
> I'd try QGLFramebuffer, but that is not supported on my box right now.
>
> Thanks,
>
> Brad
Greets,
Ben
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