[vtkusers] glDrawPixels is really slow on windows...

[Anja Ende]

Hi everyone,

I moved my application from Linux to windows. It uses VTK and the Qt
libraries. I had a base VTK window and was using Qt drawing routines to draw
things on top of the VTK window.

I was using the vtkRenderWindow SetRGBACharPixelData method to blend the QT
and vtk image data and than display it on the screen. This worked great
under Linux. Now, I moved the code to Windows only to find that glDrawPixels
is really, really slow. All my paint routines are horribly now horribly
slow.

I was wondering if someone knows of a work around. I was thinking that I
could use Qt to do all the blending and compositing and somehow load the
data into a texture and have VTK display it. However, I could not find any
example for such texture creation.

If anyone could post some code snippets for loading a texture onto a vtk
openGL window. I would be greateful.


Cheers,

Anja
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