emitter.h

/*
    This file is part of Nori, a simple educational ray tracer
 
    Copyright (c) 2015 by Wenzel Jakob
 
    Nori is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License Version 3
    as published by the Free Software Foundation.
 
    Nori 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/>.
*/
 
#if !defined(__NORI_EMITTER_H)
#define __NORI_EMITTER_H
 
#include <nori/object.h>
 
NORI_NAMESPACE_BEGIN
 
struct Intersection;
struct EmitterQueryRecord {
    Point3f ref;
    Point3f p;
    Normal3f n;
    Vector3f wi;
    float pdf;
    Ray3f shadowRay;
 
    EmitterQueryRecord() { }
 
    EmitterQueryRecord(const Point3f &ref) : ref(ref) { }
 
    EmitterQueryRecord(const Point3f &ref, const Point3f &p, const Normal3f &n) :
        ref(ref), p(p), n(n) {
        wi = (p - ref).normalized();
    }
};
 
class Emitter : public NoriObject {
public:
 
    virtual Color3f sample(EmitterQueryRecord &lRec, const Point2f &sample) const = 0;
 
    virtual Color3f eval(const EmitterQueryRecord &lRec) const = 0;
 
    virtual float pdf(const EmitterQueryRecord &lRec) const = 0;
 
 
    virtual Color3f samplePhoton(Ray3f &ray, const Point2f &sample1, const Point2f &sample2) const {
        throw NoriException("Emitter::samplePhoton(): not implemented!");
    }
 
 
    virtual ~Emitter() {}
 
    virtual EClassType getClassType() const override { return EEmitter; }
 
    void setShape(Shape * shape) { m_shape = shape; }
 
protected:
    Shape * m_shape = nullptr;
 
};
 
NORI_NAMESPACE_END
 
#endif /* __NORI_EMITTER_H */