here it is:
http://www.openscenegraph.org/projects/osg/wiki/Support/Tutorials/ShadersUpdating
ledocc wrote:
> Hi Nan
>
> Can you provide link of tutorial you are talking about ?
>
> Cheer
> David Callu
>
>
> 2011/5/4 Nan WANG < ()>
>
> > Hello everyone:
> >
> > i have a question regarding how to pass texture to shader
> >
> > There were some code in the tutorial, such as:
> >
> >
> > Code:
> >
> > bumpMapProgramObject->addShader( bumpFragmentObject );
> > bumpMapProgramObject->addShader( bumpVertexObject );
> >
> > osg::Uniform* lightPosU =
> > new osg::Uniform("LightPosition",osg::Vec3(0,0,1));
> > osg::Uniform* normalMapU = new osg::Uniform("normalMap",1);
> > osg::Uniform* baseTextureU = new osg::Uniform("baseTexture",0);
> >
> > bumpMapState->addUniform(lightPosU);
> > bumpMapState->addUniform(normalMapU);
> > bumpMapState->addUniform(baseTextureU);
> > lightPosU->setUpdateCallback(new updateBumpShader() );
> >
> > bumpMapState->setAttributeAndModes
> > (bumpMapProgramObject, osg::StateAttribute::ON);
> >
> > osg::Texture2D* tankBodyNormalMap = new osg::Texture2D;
> > tankBodyNormalMap->setDataVariance(osg::Object::DYNAMIC);
> > osg::Image* tankBody = osgDB::readImageFile("TankBump.png");
> > if (!tankBody)
> > {
> > std::cout << " couldn't find texture, quiting." << std::endl;
> > return -1;
> > }
> >
> > tankBodyNormalMap->setImage(tankBody);
> > bumpMapState->setTextureAttributeAndModes
> > (1,tankBodyNormalMap,osg::StateAttribute::ON);
> >
> >
> >
> >
> > Here, the example creates
> > osg::Uniform* normalMapU = new osg::Uniform("normalMap",1);
> >
> > '1'is the initial value of normalMap? how to link to texture unit in shader?
> >
> > using (Am I right?)
> >
> > bumpMapState->setTextureAttributeAndModes
> > (1,tankBodyNormalMap,osg::StateAttribute::ON);
> >
> >
> > here the value of first parameter should be the same as initial value in
> > the 'new osg::Uniform("normalMap",1);'
> >
> > and the way to have the 'tankBodyNormalMap' in bumpmap.vert, using
> > gl_MultiTexCoord0 or gl_MultiTexCoord1?
> >
> > where we can find bumpmap.vert?
> >
> > Thank you!
> >
> > Cheers,
> > Nan
> >
> > ------------------
> > Read this topic online here:
> > http://forum.openscenegraph.org/viewtopic.php?p=38982#38982
> > (http://forum.openscenegraph.org/viewtopic.php?p=38982#38982)
> >
> >
> >
> >
> >
> > _______________________________________________
> > osg-users mailing list
> > ()
> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org)
> >
>
>
> ------------------
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Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=38985#38985
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