[osg-submissions] Move MRT into FBO patch

[Art Tevs]

Hi Robert,

I have now found out when this problem with
glDrawBuffers happens, or at least I suppose I know
when.

The problem comes when one use FBO as StateAttribute.
In my case I do assign the FBO as state attribute to
the stateset of a node, allowing nodes to specify if
they want to be rendered in a texture or not. 

This means, that everytime when the node is rendered
there is a glDrawBuffers call, because of the FBO.
However afterwards there is no reset to the default
draw buffers mode. Even worse, there is no real unbind
of the FBO, which mean, I have to add an empty FBO to
other nodes, which do not use FBO, so that I get
something like glBindFramebufferEXT(0) called when
other nodes are rendered.

I hope I was able to explain you my problem.


I think this is not only a problem with draw buffers,
but also with FBOs if one use them as StateAttribute
in a StateSet.


Please comment on this. I have already couple of ideas
how to solve that issue, however we have to discuss.
Maybe I am making mistakes.


Art



--- Robert Osfield <robert.osfield at gmail.com> schrieb:

> On Wed, Apr 16, 2008 at 10:41 AM, Art Tevs
> <stud_info2 at yahoo.de> wrote:
> >  good, I am glad to hear that this do its job.
> >  Then this feature can now be shipped as official
> MRT
> >  support in the upcoming osg version ;-)
> 
> Yep, it'll be in 2.4 ;-)
> 
> Could you let us know how testing goes at your end,
> and whether we do
> need to add the extra fallback glDrawBuffers calls
> into
> FrameBufferObject.cpp
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>
http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org
> 



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