1 #ifndef BRDF_H_

2 #define BRDF_H_

3

4 #include "texture.h"

5

6 class Reflectance {

7 public:

8 Reflectance();

9 virtual ~Reflectance() = default;

10

11 virtual Vector3 sample_dir(const Vector3 &norm, const Vector3 &outdir) const = 0;

12 virtual float sample(const Vector3 &norm, const Vector3 &outdir, Vector3 *indir) const;

13 virtual float eval(const Vector3 &norm, const Vector3 &outdir, const Vector3 &indir) const = 0;

14 };

15

16 class LambertRefl : public Reflectance {

17 public:

18 Vector3 sample_dir(const Vector3 &norm, const Vector3 &outdir) const override;

19 float eval(const Vector3 &norm, const Vector3 &outdir, const Vector3 &indir) const override;

20 };

21

22 #endif // BRDF_H_