hmm, I was unaware of crash bugs in Program switching. If you could create a simple repro, I'd be interested. -- mew
On Fri, Nov 14, 2008 at 9:48 AM, Tueller, Shayne R Civ USAF AFMC 519 SMXS/MXDEC <[EMAIL PROTECTED]> wrote: > Mike, > > Thanks for the reply. There was an exchange on this subject back on August > 28 in the archives. I tried all the suggested solutions to the problem to no > avail. I have tried binding to an "empty" program as you suggest by using > the call ss->SetAttributesAndModes(new osg::Program()) which does indeed > turn off the shader (back to fixed functionality). But when I attempt to > switch back to the shader with another call to > ss->SetAttributesAndModes(MyShaderProgram), it crashes my OpenSceneGraph > app. > > I've tried the other suggestions such as removing the shaders from the > program and then adding them back on for enable/disable and also the call > ss->RemoveAttribute(MyShaderProgram) which have also caused a crash on the > ensuing call ss->SetAttributesAndModes(MyShaderProgram). The only mechanism > that has worked cleanly for me is if I create two programs, one that is > empty and one that has my vertex/fragment shaders attached. When I call each > programs "apply" method to switch the shaders off and on, this seems to > work. I'm not sure if this the correct way to do it though. > > I've also noticed that there is no clean way of switching between multiple > programs attached to a single object during runtime. At least I haven't > found a way to get it to work in OSG. In OpenGL, I've always been able to > have multiple programs that I can swap in and out via the call to > glUseProgram() with the appropriate program handle (including the call > glUseProgram(0) to switch to the fixed pipe). I don't see an equivalent > mechanism in OpenSceneGraph to achieve the same functionality. > > If you or anyone else can enlighten me, it would be most appreciated... > > -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.org >> >> > > > > -- > Mike Weiblen -- Boulder Colorado USA -- http://mew.cx/ > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > -- Mike Weiblen -- Boulder Colorado USA -- http://mew.cx/ _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
