Hi Nan
Can you provide link of tutorial you are talking about ?
Cheer
David Callu
2011/5/4 Nan WANG <nan.c...@gmail.com>
> 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
>
>
>
>
>
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