Re: [osg-users] Using osgText with GraphicsWindowEmbedded and Qt causes problems
HI Preet, You'll need to rest OpenGL into consistent state when moving between Qt and the OSG. I don't know anything about QGLFrameBufferObject so can't comment on what state it'll be managing. What I can say is that the OSG has it's own native FBO support that will work just fine all by itself and normally there wouldn't be any need to get QT involved. Personally I'd try to keep Qt out for doing too much OpenGL work itself. Robert. On 5 July 2012 01:30, Preet prismatic.proj...@gmail.com wrote: Hi. I have a scene consisting of just an osgText object and its shaders. The scene works fine in a default application where OpenSceneGraph is the only library being used, but won't render correctly when I try to draw to a QGLFrameBufferObject. Drawing to the FBO works fine if I don't use osgText (other than text, I've just tried simple models so far). Using osgText 'messes' the Qt UI up, by changing the order of what (Qt items) are painted or changing their size or stretching them... nothing from OSG seems to be painted at all. I'm guessing there's a conflict with OpenGL calls between Qt and OSG. OSG is set up using GraphicsWindowEmbedded, and in Qt, I bind my framebuffer before calling osgViewer's frame(), and release it after. I'm lost as to why using osgText of all things would cause this issue. Just the inclusion of osgText in my scene tree causes the problem. Does anyone have any suggestions as to how I can force Qt and OSG to play nice? Preet ___ 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] Using osgText with GraphicsWindowEmbedded and Qt causes problems
Hi Robert, On Mon, Jul 9, 2012 at 9:01 AM, Robert Osfield robert.osfi...@gmail.com wrote: HI Preet, You'll need to rest OpenGL into consistent state when moving between Qt and the OSG. I don't know anything about QGLFrameBufferObject so can't comment on what state it'll be managing. This was indeed the case. For anyone else that runs into issues integrating the two libs, I've found some OpenGL states that should be reset after drawing an OSG frame, before control is given back to Qt. More state settings might need to be changed depending on what exactly OpenSceneGraph is being used for, but the following seems to work with some basic textured geometry. // qpainter uses vertex attribs 3,4,5 so we need to explicitly disable them: glDisableVertexAttribArray(3); glDisableVertexAttribArray(4); glDisableVertexAttribArray(5); // qpainter requires depth testing to be off glDisable(GL_DEPTH_TEST) // not sure if this is required; osg changes this when using textures so I reset it to default glPixelStorei(GL_UNPACK_ALIGNMENT,4); What I can say is that the OSG has it's own native FBO support that will work just fine all by itself and normally there wouldn't be any need to get QT involved. Personally I'd try to keep Qt out for doing too much OpenGL work itself. Robert. On 5 July 2012 01:30, Preet prismatic.proj...@gmail.com wrote: ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Using osgText with GraphicsWindowEmbedded and Qt causes problems
Hi. I have a scene consisting of just an osgText object and its shaders. The scene works fine in a default application where OpenSceneGraph is the only library being used, but won't render correctly when I try to draw to a QGLFrameBufferObject. Drawing to the FBO works fine if I don't use osgText (other than text, I've just tried simple models so far). Using osgText 'messes' the Qt UI up, by changing the order of what (Qt items) are painted or changing their size or stretching them... nothing from OSG seems to be painted at all. I'm guessing there's a conflict with OpenGL calls between Qt and OSG. OSG is set up using GraphicsWindowEmbedded, and in Qt, I bind my framebuffer before calling osgViewer's frame(), and release it after. I'm lost as to why using osgText of all things would cause this issue. Just the inclusion of osgText in my scene tree causes the problem. Does anyone have any suggestions as to how I can force Qt and OSG to play nice? Preet ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
