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
