[osg-users] Issue on sharing shaders between objects

[Christian Heine]

Hello,

i've played arround with this issue, but i could solve it until now. 
First i thought there may be a problem with the reusage of the 
program, but when i copy it instead of sharing, nothing happends, i 
got the same failure.

    // finaly bind the program and activate it if it is user enabled
         if(this->m_userEnabled){

             for(uniforms_t::iterator uniIter = m_uniformCache.begin();
                 uniIter != m_uniformCache.end();
                 uniIter ++){
                 // add all uniforms from the list to the state
                 state->addUniform((*uniIter).second.get(), 
osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE | 
osg::StateAttribute::PROTECTED);
             }

	    /* fake for copy program
             osg::ref_ptr<osg::Program> prg = new osg::Program;
             prg->addBindAttribLocation("tangent", 
osg::Drawable::ATTRIBUTE_6);
             prg->addBindAttribLocation("binromal", 
osg::Drawable::ATTRIBUTE_7);

             boost::shared_ptr<OSGTechnique> technique =
             this->getOSGTechnique(AbstractTechnique::VERSION_PS30);

             // convert BinRev shader params to osg::Uniform and 
osg::Attribute objects
             for( unsigned int i = 0;
                  i <  technique->getNumberOfShaders();
                  i++)
             {
                 boost::shared_ptr<OSGGLSLShader> shader =
 
boost::dynamic_pointer_cast<OSGGLSLShader>(technique->getShader(i));
                 prg->addShader(shader->getShader().get());
             }
	    */

             state->setAttributeAndModes(prg.get(), 
osg::StateAttribute::ON);
         }
         // otherwise bind the program and deactivate it.
         else{
             state->setAttributeAndModes(m_program.get(), 
osg::StateAttribute::OFF);
         }
     }

There is nothing realy special...
I've attached an image to show what's going wrong.

Has anyone a hint what could be going wrong? I'm running out of ideas..

Best regards,
Christian






hellhound at binary-revolution.org wrote:
> Hello,
> 
> i've successfully implemented a simple dot3 object shading for my scene and
> it works fine with single objects. Now i try to share the shaders between 
> different objects in the scene and got some trouble:
> 
> To share the shaders i've one osg::Program, where i've added two osg::Shader
> objects. The osg::Program instance is shared between the objects and applied
> to their osg::StateSet objects. The required osg::Uniform objects are created 
> explicit for each object and bind to their osg::StateSet in a separated process.
> So only the osg::Program and osg::Shader are Shared (later i will share the
> equal uniforms too).
> 
> The shader works, but it's effected on all objects equals to the object where
> the osg::Program has applied first. I.e. i've added two normal mapped cubes in
> the scene. When i set the light between both cubes i expect that both cube faces
> are enlighted arround the light, but on the 2nd cube the thame face of the first
> cube is enlighted...
> 
> Have i consider something special for the sharing of (object) shaders between
> objects?
> 
> Best regards,
> Christian 
> 
> 
> 
> _______________________________________________
> osg-users mailing list
> osg-users at lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> 

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