envmap.h

#ifdef _MSC_VER
#pragma once
#endif

#ifndef _SPICA_ENVMAP_H_
#define _SPICA_ENVMAP_H_

#include <vector>

#include "core/light.h"

#include "core/spectrum.h"
#include "core/vector3d.h"
#include "core/bsphere.h"
#include "core/mipmap.h"
#include "core/sampling.h"

namespace spica {

class Photon;

class SPICA_EXPORTS Envmap : public Light {
public:
    Envmap(const BSphere& worldSphere, const Image& texmap, const Transform& lightToWorld,
           double scale, int numSamples = 1);

    Envmap(RenderParams &params);

    virtual ~Envmap();

    Spectrum sampleLi(const Interaction& pObj, const Point2d& rands,
                        Vector3d* dir, double* pdf, VisibilityTester* vis) const override;

    double pdfLi(const Interaction& pObj, const Vector3d& dir) const override;

    Spectrum sampleLe(const Point2d& rand1, const Point2d& rand2,
                        Ray* ray, Normal3d* nLight, double* pdfPos,
                        double* pdfDir) const override;
    void pdfLe(const Ray& ray, const Normal3d& nLight, double* pdfPos,
                double* pdfDir) const override;

    Spectrum Le(const Ray& ray) const override;
    Spectrum power() const override;

    Light* clone() const override;

private:
    std::unique_ptr<const MipMap> mipmap_;
    Point3d worldCenter_;
    double   worldRadius_;
    Distribution2D distrib_;
};

SPICA_EXPORT_PLUGIN(Envmap, "Environment mapping");

}  // namespace spica

#endif  // _SPICA_ENVMAP_H_