emitter.h

/*
    Lightmetrica : A research-oriented renderer

    Copyright (c) 2014 Hisanari Otsu

    This program 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 3 of the License, or
    (at your option) any later version.

    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#pragma once
#ifndef LIB_LIGHTMETRICA_EMITTER_H
#define LIB_LIGHTMETRICA_EMITTER_H

#include "generalizedbsdf.h"
#include "aabb.h"

LM_NAMESPACE_BEGIN

struct Primitive;
struct SurfaceGeometry;
class Scene;
class EmitterShape;

class Emitter : public GeneralizedBSDF
{
public:

    Emitter() {}
    virtual ~Emitter() {}

public:

    virtual void SamplePosition(const Math::Vec2& sample, SurfaceGeometry& geom, Math::PDFEval& pdf) const = 0;

    virtual Math::Vec3 EvaluatePosition(const SurfaceGeometry& geom) const = 0;

    virtual Math::PDFEval EvaluatePositionPDF(const SurfaceGeometry& geom) const = 0;

    virtual void RegisterPrimitives(const std::vector<Primitive*>& primitives) = 0;

    virtual void PostConfigure(const Scene& scene) = 0;

    virtual EmitterShape* CreateEmitterShape() const = 0;

    virtual AABB GetAABB() const = 0;

};

LM_NAMESPACE_END

#endif // LIB_LIGHTMETRICA_EMITTER_H