[osg-users] Camera::setPreDrawCallback -> add?

[Robert Osfield]

Hi Anders,

There is only one callback for pre and post draw callbacks to keep the
API as simple as possible - just two methods per callback - a get and
set.  Once you add a list you end with add/remove/get/getnumber.

One way to do multiple callbacks is to nest the callbacks, so you have
your own CompositeCameraCallback which contains a list of Camera
callbacks.

Robert.

On 8/31/07, Anders Backman <andersb at cs.umu.se> wrote:
> Hi.
>
> In osgProducer there was the concept of a list of pre/post drawcallbacks.
>
> In osgViewer there can be only one.
>
> Is purposely done for a specific reason (performance, complexity, ..)?
> It is not very uncommon to have several pre/post draw callbacks for a
> viewer, and if you are developing an API where you internally to the API add
> drawcallbacks, and the user of the api accesses the camera later on and do
> camera->setPreDrawCallback(myCallback), well then you are
> fried.
>
>
> So could it be possible to refactor that into a list of callbacks?
> /Anders
> --
>
>
> ________________________________________________________________
>  Anders Backman               Email:     andersb at cs.umu.se
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