UniformUpdateCallback.h

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#include <osg/Uniform>

#include <vrecko/World.h>
#include <vrecko/Scene.h>

#include <vrecko/EnvironmentObject.h>


class UniformUpdateCallback : public osg::Uniform::Callback
{
private:
    
    osg::ref_ptr<osg::Camera> camera;

private:
    // Updates viewport size
    void updateViewport(osg::Uniform* un) const;
    // Updates position of far clipping plane vertices
    void updateFarPlane(osg::Uniform* un) const;
    // Updates camera position
    void updateCameraPos(osg::Uniform* un) const;

    void updateViewMatrix(osg::Uniform* un) const;
    void updateViewMatrixInverse(osg::Uniform* un) const;

public:
    // Takes care of updating uniforms for shaders
    UniformUpdateCallback(osg::Camera* _camera)
        : osg::Uniform::Callback(), camera(_camera){
    }

    // Calls appropriate function according to uniform name
    virtual void operator() ( osg::Uniform* un, osg::NodeVisitor* nv )
    {
        const std::string& uniformName = un->getName();

        if ( uniformName == "viewport" ) {
            updateViewport(un);
        }
        else if ( uniformName == "farPlaneVertices" ) {
            updateFarPlane(un);
        }
        else if ( uniformName == "cameraPos" ) {
            updateCameraPos(un);
        }
        else if ( uniformName == "viewMatrix" ) {
            updateViewMatrix(un);
        }
        else if ( uniformName == "viewMatrixInverse" ) {
            updateViewMatrixInverse(un);
        }
    }
};