nuclear@2: #ifndef BRDF_H_
nuclear@2: #define BRDF_H_
nuclear@2: 
nuclear@2: #include "texture.h"
nuclear@2: 
nuclear@2: class Reflectance {
nuclear@2: public:
nuclear@2: 	Reflectance();
nuclear@2: 	virtual ~Reflectance() = default;
nuclear@2: 
nuclear@2: 	virtual Vector3 sample_dir(const Vector3 &norm, const Vector3 &outdir) const = 0;
nuclear@2: 	virtual float sample(const Vector3 &norm, const Vector3 &outdir, Vector3 *indir) const;
nuclear@2: 	virtual float eval(const Vector3 &norm, const Vector3 &outdir, const Vector3 &indir) const = 0;
nuclear@2: };
nuclear@2: 
nuclear@2: class LambertRefl : public Reflectance {
nuclear@2: public:
nuclear@2: 	Vector3 sample_dir(const Vector3 &norm, const Vector3 &outdir) const override;
nuclear@2: 	float eval(const Vector3 &norm, const Vector3 &outdir, const Vector3 &indir) const override;
nuclear@2: };
nuclear@2: 
nuclear@2: #endif	// BRDF_H_