-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Thrall, Bryan Sent: Friday, November 14, 2008 10:10 AM To: OpenSceneGraph Users Subject: Re: [osg-users] shaders in OSG...
>Do these crashes go away if you run OSG single-threaded? It sounds like >you might be changing the scenegraph at a point where it isn't safe to >do so. In general, it is safe to change the scenegraph from an update >callback, but otherwise you could have problems. Also, if you are making >changes to a StateSet, you should mark it as DYNAMIC. See also below. I have not tried running OSG single threaded. I have tried the changes both before I call osgviewer.run() and in an update callback after the render loop is going. Both have caused crashes. I have not tried marking the StateSet as DYNAMIC unless that is the default setting. I will look into this. >See osg::Switch; you could create two child nodes, one with an empty >Program, the other with the shaders. Have them both make the actual >scenegraph their child; then you can use the Switch to determine whether >the fixed pipeline is used or not. Thanks for this suggestion. I will look into this further... -Shayne > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Mike > Weiblen > Sent: Thursday, November 13, 2008 11:33 AM > To: OpenSceneGraph Users > Subject: Re: [osg-users] shaders in OSG... > > The only way to turn off a glProgram in GL is glUseProgram(0), there > is no glEnable/glDisable. > > In OSG you do that by creating an "empty" osg::Program, one with no > osg::Shaders attached. Just attach that empty osg::Program where you > want to revert to fixed-function. Further details in > http://mew.cx/osg_glsl_july2005.pdf > > cheers > -- mew > > > > On Wed, Nov 12, 2008 at 2:55 PM, Tueller, Shayne R Civ USAF AFMC 519 > SMXS/MXDEC <[EMAIL PROTECTED]> wrote: >> Hello, >> >> >> >> Is there a "light weight" way to turn off shaders in OSG without unloading >> the vertex and fragment shaders from the shader program? >> >> >> >> My application needs to switch back and forth from the shader pipeline to >> the fixed pipeline and vice versa during runtime. This can be done at the >> OpenGL level by calling the function glUseProgramObject() to make the quick >> switch. Is there an equivalent in OpenSceneGraph? >> >> >> >> Thanks in advance, >> >> -Shayne >> >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g -- Bryan Thrall FlightSafety International [EMAIL PROTECTED] _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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