CookTorranceBRDF.h

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/* $Id: CookTorranceBRDF.h,v 1.1 2002/12/05 15:02:18 cvs Exp $ */

#ifndef __COOK_AND_TORRANCE_BRDF_H
#define __COOK_AND_TORRANCE_BRDF_H

#include <esg/brdf/SpecularBRDF.h>
#include <esg/brdf/PhongBRDF.h>

namespace esg {

class OGSCENE_EXPORT CookTorranceBRDF : public SpecularBRDF {
protected:
        virtual void _duplicate_attributes (const BRDF& src) {
            SpecularBRDF::_duplicate_attributes(src);
        }
        
public:
        CookTorranceBRDF (void) : SpecularBRDF(true) {}

        virtual RetVal reflectance(const MatVisitor& visitor,
                                   const Vector3*    L,
                                   const Vector3*    V,
                                   const Vector3*    N,
                                   Vector3&          color);

        virtual RetVal reflectanceVNL(const MatVisitor& visitor,
                                      const Vector3*    L,
                                      const Vector3*    V,
                                      const Vector3*    N,
                                      double            NV,
                                      double            NL,
                                      Vector3&          color);
        
        virtual RetVal reflectanceNL(const MatVisitor& visitor,
                                     const Vector3*    L,
                                     const Vector3*    V,
                                     const Vector3*    N,
                                     double            NL,
                                     Vector3&          color);

        virtual BRDF * clone (void) const { return new CookTorranceBRDF(); }

        virtual double albedo (const MatVisitor& visitor,
                               const Vector3&    N,
                               const Vector3*    V) const {
            PhongBRDF b;
            return b.albedo(visitor, N, V); // TO DO!
        }

        virtual void importanceSample(const MatVisitor& visitor,
                                      const Vector3&    D,
                                      double            r1,
                                      double            r2,
                                      Vector3&          dir,
                                      double*           pPDFVal) {
        // TO DO!
            PhongBRDF b;
            b.importanceSample(visitor, D, r1, r2, dir, pPDFVal);
        }

        virtual Vector2 dir2uv (const MatVisitor& visitor,
                                const Vector3&    N,
                                const Vector3&    D) const {
            // TO DO
            PhongBRDF b;
            return dir2uv(visitor, N, D);
        }
};
    
}; // namespace

#endif

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