[osg-submissions] Multiple Render Targets

[Robert Osfield]

Hi J.P,

I've just done a quick merge of your changes (and committed the typo
fixes) and have run the osgmultiplerendertergets example but don't
know whether its working as all I get is yellow quad.  I have a 7800GT
on this machine.

What should I expect?

Robert.

On Wed, Apr 2, 2008 at 10:09 AM, J.P. Delport <jpdelport at csir.co.za> wrote:
> 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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