Ah ok, it is not unheard of for older GPUs to only support constant array indices.
Some previous-generation architectures don't have hardware to do array indirection at run-time, so "array support" actually consists of compile-time unrolling w/ constant indices. I think you may have hit a brick wall on the 7800. -- mew > -----Original Message----- > From: [EMAIL PROTECTED] [mailto:osg-users- > [EMAIL PROTECTED] On Behalf Of Roni Rosenzweig > Sent: Monday, February 04, 2008 1:36 PM > To: OpenSceneGraph Users > Subject: Re: [osg-users] problem using uniform arrays > > Hi Mike > I may have narrowed down the problem. It's not so much the arrays that > are > causing problems, but their usage. > For example indexing an array like this: > arr[ind] > works fine for the vertex shader, but doesn't compile on the fragment > shader, saying that the index has to be constant, so that arr[ind] is > not > allowed, but arr[3] is ok. > However, since I'm using long arrays (70 elements), I don't know how to > work > around this limitation. > Any ideas? > Notice that this error only happens on 7800, not on 8800. > Also, even though I changed the osg notification level to debug, I get > no > error/warning messages when compiling and linking the shader. Don't > know why > ... (I used another glsl debugger to get the error messages) > Roni > > ----- Original Message ----- > From: "Mike Weiblen" <[EMAIL PROTECTED]> > To: "OpenSceneGraph Users" <[email protected]> > Sent: Monday, February 04, 2008 8:57 PM > Subject: Re: [osg-users] problem using uniform arrays > > > > Hi Roni, > > See below > > > > > -----Original Message----- > > > From: [EMAIL PROTECTED] [mailto:osg-users- > > > [EMAIL PROTECTED] On Behalf Of Roni Rosenzweig > > > Sent: Monday, February 04, 2008 1:18 AM > > > To: OpenSceneGraph Users > > > Subject: [osg-users] problem using uniform arrays > > > > > > Hello > > > I'm using uniform arrays in my glsl shader. On geforce 8800 it > works > > > great, but on 7800 doesn't work (converts to fixed shader). > > > when I try to validate my shader code I get a "GL_3DL_array_objects > > > extension is disabled" error. > > > > Assuming you used 3Dlabs' GLSLvalidate tool which, as you can see, is > > only helpful up to a point. > > > > > Are uniform arrays not supported on geforce 7800? > > > > No idea. Array support often a driver issue, but could require some > > hardware capability. Are both GPUs running exactly the same driver? > > > > It would be most helpful to see the actual error messages generated > > during OSG's attempt to compile/link the shader code (eg perhaps you > in > > fact have a bug completely unrelated to arrays) When you increase > the > > OSG_NOTIFY_LEVEL, it will print out the compile/link InfoLogs > containing > > diagnostic info. What are those messages? > > > > Cut down your shader code to a bare minimum example that works on > 8800 > > but fails on 7800. That repro case should probably be no more than a > > couple lines. > > > > Hth > > -- mew > > > > _______________________________________________ > > 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 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
