Hi again,
So I'll investigate a bit more as to why pbuffer is failing. We've not
ruled out a driver bug or an OSG bug here as far as I can see, it could
still be both, since all the OSG pbuffer examples I've tried have failed
in the same way.
I've tried an example that uses straight WGL_ARB_pbuffer code and it
works fine. I found the example on the web, see here:
http://www.codesampler.com/oglsrc/oglsrc_7.htm
See the example "Off-screen Rendering Using Pixel Buffers" and I used
version #1.
However this still doesn't prove it isn't a driver bug, since this
example is single threaded and if I make the pbuffertest example single
threaded (by adding
viewer.setThreadingModel(osgViewer::ViewerBase::SingleThreaded); after
the viewer creation) it works too.
I've debugged what happens, and roughly the sequence is this:
1. main(): createGraphicsContext(traits.get())
---> PixelBufferWin32 is created successfully
2. main(): viewer.realize()
---> PixelBufferWin32::makeCurrentImplementation() is called, and
succeeds.
3. GraphicsThread::run()
---> PixelBufferWin32::makeCurrentImplementation() is called, and
fails with "The requested resource is in use".
I don't know why the second makeCurrentImplementation would fail, but
going from Juan's hunch that it was failing because some other thread
was holding on to it (the main thread in this case), I added the
following code after viewer.realize(); :
viewer.stopThreading();
gc->releaseContext();
viewer.startThreading();
This made it work.
This is obviously not a solution. It worked as-is before on Linux, so
perhaps on Windows the makeCurrent() call makes the context "exclusive"
to the thread on which it was called, whereas on Linux a subsequent
makeCurrent() will still succeed and just remove the context from the
previous thread that had it current silently?
Just theorizing here.
Any other ideas?
J-S
--
______________________________________________________
Jean-Sebastien Guay jean-sebastien.g...@cm-labs.com
http://www.cm-labs.com/
http://whitestar02.webhop.org/
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