[osg-users] Graphics Context question
I have a RTT camera which renders to texture using graphics context 1. Can I render this texture on quad in graphics context 2? CD ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Graphics Context question
On 21 March 2014 15:59, Conan d...@celticblues.com wrote: I have a RTT camera which renders to texture using graphics context 1. Can I render this texture on quad in graphics context 2? If you explictly create the graphics contexts so they are shared you can share texture objects, however, to do this you have make sure that the two graphics contexts are syncronized so that they never read/write to the same GL objects at the same time, which for practically purposes means running them in single threaded. RTT Texture are best managed within the same context as the texture will be used. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Graphics Context question
I am using different graphics contexts simply because I want to display the texture(s) in a separate window from the window in which my original scene is rendered. Is it possible to have 2 windows which share the same context, but have different scenegraphs? How would I create the shared context? CD On 2014-03-21 12:17, Robert Osfield wrote: On 21 March 2014 15:59, Conan d...@celticblues.com wrote: I have a RTT camera which renders to texture using graphics context 1. Can I render this texture on quad in graphics context 2? If you explictly create the graphics contexts so they are shared you can share texture objects, however, to do this you have make sure that the two graphics contexts are syncronized so that they never read/write to the same GL objects at the same time, which for practically purposes means running them in single threaded. RTT Texture are best managed within the same context as the texture will be used. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Graphics Context Question
Hi Paul, All OpenGL calss have to be done from a thread with valid graphics context, and some GLX calls have the same restriction. When the osgViewer runs multi-threaded each GraphicsContext/GraphicsWindow has it's own GraphicsThread, so any GL/specific GLX calls you need to do will need to be done in this thread. Attaching a pre/initial or post/final draw callback on the viewer's camera will enable you to do your calls. In your case you are wanting to do calls between update and cull, which is a bit awkward as osgViewer is set up so that cull is not intended to require a valid graphic context. The only times when cull does have a valid graphics context is when you use CullDrawThreadPerContext or SingleThreaded threading models. In these cases you could use a custom osgViewer::Renderer assigned to the active cameras (be it master or slave), in this custom Renderer you could override the cull/cull_draw method. What you are doing is rather on the bleeding edge though, it's not something I've experimented with myself so it may well be awkward to implement, if it is too problematic then this suggests that osgViewer needs to be refactored a little to make it possible to do what you are after. Perhaps even integrating sync support directly into osgViewer might be the right thing to do. Robert. On Tue, Sep 21, 2010 at 2:20 AM, paul1...@yahoo.com wrote: I need to call glXWaitVideoSyncSGI() between the update and cull traversals. As I understand it, this needs to be called with a valid graphics context so I do viewer.getCamera()-getGraphicsContext()-makeCurrent() and then call glXWaitVideoSyncSGI() and then call the viewer.renderingTraversals(). However, the glXWaitVideoSyncSGI call is only working when I use a SingleThreading model. Otherwise, glXWaitVideoSyncSGI is returning with an error about a Bad Context. What am I doing wrong? Paul P. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Graphics Context Question
I need to call glXWaitVideoSyncSGI() between the update and cull traversals. As I understand it, this needs to be called with a valid graphics context so I do viewer.getCamera()-getGraphicsContext()-makeCurrent() and then call glXWaitVideoSyncSGI() and then call the viewer.renderingTraversals(). However, the glXWaitVideoSyncSGI call is only working when I use a SingleThreading model. Otherwise, glXWaitVideoSyncSGI is returning with an error about a Bad Context. What am I doing wrong? Paul P. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
