Hi Robert, thanks for the information about the contexts. Now my task seems to me easier that I thought. I'm subclassing from osgViewer::GraphicsWindow, so I think I'll have to take account for the context IDs and the osg::State, as the osgwxviewer does (though only for one view). Anyways, I have the aid of the osgViewer::GraphicsWindowEmbedded class to copy some of its implementation details.
Alberto El Thursday 20 September 2007 17:51:57 Robert Osfield escribió: > Hi Alberto, > > On 9/20/07, Alberto Luaces <[EMAIL PROTECTED]> wrote: > > I'm a bit confused about the naming. What do you mean by "graphics > > context"? An OpenGL one or an osg::GraphicsContext? > > osg::GraphicsContext maps directly to an OpenGL context so there > should not be any confusion. > > > I ask because currently I have a wxWidgets application with two views of > > the same scene. Each view is attached to an osgViewer::GraphicsWindow > > which in turn controls its wxGLcanvas. The two wxGLcanvas were created > > with a common OpenGL context, so all the GL objects as display lists, > > textures... are shared. Each osgViewer::GraphicsWindow has one > > osg::State. > > A sharing OpenGL contexts doesn't mean actually sharing of the > context, its just sharing some data between contexts, so you don't > have a "common OpenGL context", you have two separate OpenGL contexts > that are sharing display lits/texture objects etc. > > Each GraphicsWindow "is a" GraphicsContext which maps directly to a > single OpenGL graphics context. Each OpenGL graphics context has its > own state machine which is mapped by a single osg::State object - > which you'll find on the GraphicsContext. > > Sharing of display lists/texture objects between contexts on the OSG > just requires you to set the State::ContextID to same value. If the > GraphicsWindow implementation is set up correctly then it'll > automatically assign the same ContextID for each of the seperate > osg::State objects. > > > In summary I have > > > > 2 wxGLCanvas ( sharing GL objects, one only common wxGLContext) > > 2 osgViewer::GraphicsWindow ( which are in fact 2 osg::GraphicContext) > > 2 osgViewer::View (I'm using osgViewer::CompositeViewer) > > 2 osg::State (not sure if only one would do) > > > > If, in addition, I wanted to show two more views of a new different > > scene, should I do the same as before (creating 2 GraphicsWindows, 2 > > Views, 2 States and connect them to the 2 wxGLCanvas with a new shared > > OpenGL context) and attaching the Views to the existing CompositeViewer > > or should I create a new CompositeViewer and attach the 2 new Views > > there? > > Ideally a single CompositeViewer should be used per app, and the > various Views and associate GraphicsWindow managed according to your > needs. The osg::State objects should all be managed as an > implementation detail, you shouldn't need to concern yourself with it. > > Robert. _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
