DiffuseBRDF.h

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/* $Id:$ */

#ifndef __DIFFUSE_BRDF_H
#define __DIFFUSE_BRDF_H

#include <esg/brdf/BRDF.h>
#include <esg/visitor/MatVisitor.h>
#include <esg/Export>

namespace esg {

class OGSCENE_EXPORT DiffuseBRDF : public BRDF {
protected:
        virtual void _duplicate_attributes (const BRDF& src) {
            BRDF::_duplicate_attributes(src);
        }
    
public:
        DiffuseBRDF (bool isotropic) : BRDF(true, isotropic) {}

        virtual RetVal reflectance(const MatVisitor& visitor,
                                   const Vector3*    L,
                                   const Vector3*    V,
                                   const Vector3*    N,
                                   Vector3&          color) = 0;

        virtual RetVal reflectanceVNL(const MatVisitor& visitor,
                                      const Vector3*    L,
                                      const Vector3*    V,
                                      const Vector3*    N,
                                      double            NV,
                                      double            NL,
                                      Vector3&          color) = 0;

        virtual RetVal reflectanceNL(const MatVisitor& visitor,
                                     const Vector3*    L,
                                     const Vector3*    V,
                                     const Vector3*    N,
                                     double            NL,
                                     Vector3&          color) = 0;

        virtual BRDF* clone () const = 0;

        virtual double albedo (const MatVisitor& visitor,
                               const Vector3&    N,
                               const Vector3*    V) const = 0;

        virtual void importanceSample(const MatVisitor& visitor,
                                      const Vector3&    D,
                                      double            r1,
                                      double            r2,
                                      Vector3&          dir,
                                      double*           pPDFVal) = 0;

        virtual Vector2 dir2uv (const MatVisitor& visitor,
                                const Vector3&    N,
                                const Vector3&    D) const = 0;

        // Vector3* stratifiedSamples(unsigned /* # subdomains */);
};

}; // namespace

#endif // __DIFFUSE_BRDF_H

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