Hi J.P, Guy and Art et. al, On Wed, Apr 2, 2008 at 3:53 PM, J.P. Delport <[EMAIL PROTECTED]> wrote:
> > When the visitor is implemented, if a node is using MRT it's probably > > because the user attached a shader that uses gl_Data[], and then it will > > set on the flag whether it has one or many COLOR BUFFER attachments, or > > maybe the attribute will be something like (MRT, State::ON) and this > > will turn on the flags. For the cameras, if there are more than one > > COLORBUFFER attachments, it should turn the flag on whether the > > StateAttribute is ON or OFF, but if there is only one attachment (or > > less), and the user didn't set the StateAttribute to ON, the drawBuffers > > extension shouldn't be applied. > Attaching COLOR_BUFFER0 or greater now enables MRT, so no other setting > that can get out of sync is needed anymore. If user does not want MRT, > attach COLOR_BUFFER only. > > Matching shaders to attachments is still the user's responsibility. > I agree totally with J.P.. matching shaders to attachments is really the users responsibility for constructing the scene graph in the appropriate way. Trying to come up with clever visitors to try and guess at what is meant and required is not something that is practical in a general purpose way, and for the most users there is no need as they'll no whether they intend to use MRT or not based on their shaders and Camera setup. W.r.t the MRT support decoupled from osg::Camera I'd suggest this is something we'll need to address separately, before you start trying to come up with a solution we'd need to tie down some particular usages models that require it and aren't served by the standard osg::Camera RTT support. Writing an OSG example of this would a good first step for providing a concrete usage example that even if it doesn't compile or work, would still give us something to work on. I'm about to review J.P's final changes so hopefully we'll have one piece of the jigsaw in place very soon. Robert.
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