Hi Carsten,
> >
> > void MyView::postBlitHQ(OSG::DrawEnv* pEnv)
> > {
> > glPushAttrib(GL_ALL_ATTRIB_BITS);
> > FrameBufferObjectUnrecPtr pFBO = hqstage->getRenderTarget();
> > glBindFramebufferEXT(GL_READ_FRAMEBUFFER,pFBO->getGLId());
> ^^^^^^^^^^^^^
>
> does pFBO point to a OSG::FrameBufferObject? In that case getGLId()
> does
> not give you a real OpenGL id, just one that identifies the real one
> across all OpenGL contexts. You need to translate it to a real OpenGL
> id
> with pEnv->getWindow()->getGLObjectId(pFBO->getGLId())
>
Thank you very much. I now have a completely different solution which is
loosely based on the HDRStage, something like fbo -> texture ->
glGenerateMipmapEXT -> render quad. That works perfectly.
But thank you for clarifying what I did wrong in the first try, that is
essential to know.
> > On a side note, the last glPopAttrib generates INVALID_OPERATION,
> which just
> > doesn't make sense at all - any ideas welcome.
>
> that is indeed strange. I guess you tried inserting a glGetError before
> the glPopAttrib and it was good?
Of course. To be exact I inserted two glGetErrors before glPopAttrib just to
make sure that not the glGetError call itself is the source.
I modified the code to save and restore the bound fbo via
glGetIntegerv/glBindFramebufferEXT and removed pushattrib/popattrib, now
works fine without errors (although I think the code is unnecessary anyway,
as my code is the last code executed in the fbo before the framework
switches to another render target).
Aloha, Andi
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