isurfaceshader.h

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/*
    toxic - A Global Illumination Renderer
    Copyright (C) 2003-2004 Francois Beaune
    Contact: http://toxicengine.sourceforge.net/

    This file is part of toxic.

    toxic is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    toxic is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with toxic; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef TOXIC_RENDERER_ISURFACESHADER_H
#define TOXIC_RENDERER_ISURFACESHADER_H

#include "color3.h"
#include "common/misc/iclonable.h"
#include "globals.h"

namespace toxic {

    class Hit;
    class IBDF;
    class IEDF;

    //!\todo Rename and move to its own file.
    class ShadingData {
    public:
        //! Reflection properties.
        const IBDF *m_bdf;      //!< A BRDF, a BTDF or a BSDF, expressed in sr^-1.
        Color3 m_reflectance;   //!< Reflectance (either for reflection or transmission), unit-less.
    };

    class ISurfaceShader : public sheep::IClonable<ISurfaceShader> {
    public:
        ISurfaceShader(
            const IEDF *edf,
            const Color3 &radiant_exitance
        );

        virtual ~ISurfaceShader() {}

        const IEDF *GetEDF() const;
        const Color3 &GetRadiantExitance() const;

        virtual void Shade(
            const Hit &hit,
            ShadingData *shadingdata
        ) const = 0;

    protected:
        //! Emission properties.
        const IEDF *m_edf;                  //!< Emittance Distribution Function, expressed in sr^-1.
        const Color3 m_radiant_exitance;    //!< Radiant exitance, expressed in W.m^-2.
    };

#include "isurfaceshader.inl"

}

#endif  // !TOXIC_RENDERER_ISURFACESHADER_H

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