nuclear@2: #ifndef BRDF_H_
nuclear@2: #define BRDF_H_
nuclear@2: 
nuclear@2: #include <map>
nuclear@2: #include <string>
nuclear@2: #include "color.h"
nuclear@2: #include "texture.h"
nuclear@2: 
nuclear@2: class ReflAttrib {
nuclear@2: private:
nuclear@2: 	float value;
nuclear@2: 	Color color;
nuclear@2: 	Texture *map;
nuclear@2: 
nuclear@2: public:
nuclear@2: 
nuclear@2: 	ReflAttrib();
nuclear@2: 	explicit ReflAttrib(const Color &color, Texture *tex = 0);
nuclear@2: 
nuclear@2: 	void set_value(float val);
nuclear@2: 	void set_color(const Color &col);
nuclear@2: 
nuclear@2: 	void set_map(Texture *tex);
nuclear@2: 	Texture *get_map() const;
nuclear@2: 
nuclear@2: 	float get_value() const;
nuclear@2: 	float get_value(float u, float v) const;
nuclear@2: 	const Color &get_color() const;
nuclear@2: 	Color get_color(float u, float v) const;
nuclear@2: };
nuclear@2: 
nuclear@2: 
nuclear@2: class Reflectance {
nuclear@2: private:
nuclear@2: 	static ReflAttrib def_attrib;
nuclear@2: 	std::map<std::string, ReflAttrib> attrib;
nuclear@2: 
nuclear@2: 	virtual void set_default_attribs();
nuclear@2: 
nuclear@2: public:
nuclear@2: 	Reflectance();
nuclear@2: 	virtual ~Reflectance() = default;
nuclear@2: 
nuclear@2: 	virtual void set_attrib(const char *name, const Color &color, Texture *tex = 0);
nuclear@2: 	virtual ReflAttrib &get_attrib(const char *name);
nuclear@2: 	virtual const ReflAttrib &get_attrib(const char *name) const;
nuclear@2: 
nuclear@2: 	virtual float get_attrib_value(const char *name) const;
nuclear@2: 	virtual float get_attrib_value(const char *name, float u, float v) const;
nuclear@2: 	virtual Color get_attrib_color(const char *name) const;
nuclear@2: 	virtual Color get_attrib_color(const char *name, float u, float v) const;
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: private:
nuclear@2: 	void set_default_attribs() override;
nuclear@2: 
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_