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/******************************************************************/
/* This file is part of the homework assignments for CSCI-427/527 */
/* at The College of William & Mary and authored by Pieter Peers. */
/* No part of this file, whether altered or in original form, can */
/* be distributed or used outside the context of CSCI-427/527 */
/* without consent of either the College of William & Mary or */
/* Pieter Peers. */
/******************************************************************/
#ifndef _BRDF_BASE_H_
#define _BRDF_BASE_H_
#include <ostream>
#include "vec3d.h"
#include "color.h"
#include "brdfSample.h"
class brdf_base {
public:
/////////////
// Methods //
/////////////
// Note: 'in' and 'out' point away from the surface point
// Note: 'in' and 'out' are specified in the local shading frame,
// where the normal=(0.0, 0.0, 1.0).
virtual color shade(const vec3d& in, const vec3d& out) const = 0;
// Same convention for in and out.
// Returns: reflected radiance
virtual color reflectance(const vec3d& in, const vec3d& out) const = 0;
// Same convention for in and out.
// r1 and r2 are two uniform random variables.
// Returns: brdfSample record
virtual brdfSample sample(const vec3d& in, float r1, float r2) const = 0;
// returns true if BRDF has a specular/diffuse component
virtual bool isSpecular(void) const = 0;
virtual bool isDiffuse(void) const = 0;
// return the total reflectivity of the mateterial
virtual float reflectivity(void) const = 0;
/////////////
// Friends //
/////////////
friend std::ostream& operator<<(std::ostream& s, const brdf_base& b)
{
b._print(s);
return s;
}
private:
/////////////////////
// Private Methods //
/////////////////////
virtual void _print(std::ostream& s) const = 0;
};
#endif /* _BRDF_BASE_H_ */
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