[osg-submissions] Multiple Render Targets

[J.P. Delport]

Hi Robert,

following the discussion yesterday on osg-users, I have decided to 
submit the original patch as is.

MRT is enabled by an explicit call on osg::Camera (setDrawBuffers), just 
like readback of textures/images is enabled by osg::Camera->attach.

To me, the camera seems the natural place for these things at the 
moment. If it would make sense as a StateAttribute (either for Camera or 
FBO), the implementation is left as a possible future enhancement.

regards
jp

old message

----8<----
Attached are the changes to OSG's Camera and RenderStage.

Camera got a new method called setDrawBuffers (instead of the normal 
setDrawBuffer), which mirrors the OpenGL extension glDrawBuffers.

setDrawBuffers takes a vector of BufferComponents and this vector is 
then translated in RenderStage to a vector of GLenums that is passed to 
glDrawBuffers.

The new calls are orthogonal to current use cases, so hopefully no other 
code/examples would be affected.

The attached example shows sample usage. The example is very contrived, 
but I hope it explains the concept. I have some other examples that I 
can contribute later.
----8<----

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