light.h

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/* 
 * light.h - this file includes declarations and defines for light sources.
 *
 * (C) Copyright 1994-2022 John E. Stone
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * $Id: light.h,v 1.17 2022/02/18 17:55:28 johns Exp $
 *
 */

#include "shade.h"

typedef struct light_t {
  RT_OBJECT_HEAD
  flt (* shade_diffuse)(struct light_t *, shadedata *);   
} light;

typedef struct point_light_t {
  RT_OBJECT_HEAD
  flt (* shade_diffuse)(struct point_light_t *, shadedata *);   
  vector ctr;                            
  flt rad;                               
  flt (* attenuationfunc)(void *, flt);  
  flt Kc;                                
  flt Kl;                                
  flt Kq;                                
  flt (* spotfunc)(void *, vector *);    
  vector spotdir;                        
  flt fallstart;                         
  flt fallend;                           
} point_light; 

typedef struct directional_light_t {
  RT_OBJECT_HEAD
  flt (* shade_diffuse)(struct directional_light_t *, shadedata *);   
  vector dir;          
} directional_light; 


void free_light_special(void *voidlight);

directional_light * newdirectionallight(void *, vector);

point_light * newpointlight(void *, vector, flt);
point_light * newspotlight(void * tex, vector ctr, flt rad, vector dir,
                           flt fallstart, flt fallend);

point_light * newlight(void *, vector, flt);
point_light * newspotlight(void * tex, vector ctr, flt rad, vector dir,
                           flt fallstart, flt fallend);

void light_set_attenuation(point_light * li, flt Kc, flt Kl, flt Kq);


#ifdef LIGHT_PRIVATE
static int light_bbox(void * obj, vector * min, vector * max);
static void light_intersect(const point_light *, ray *);
static void light_normal(const point_light *, const vector *, const ray *, vector *);
static flt light_no_attenuation(void * vli, flt Llen);
static flt light_complex_attenuation(void * vli, flt Llen);
static flt light_no_falloff(void * vli, vector * L);
static flt light_spotlight_falloff(void * vli, vector * L);
static flt point_light_shade_diffuse(point_light * li, shadedata *);
static flt simple_point_light_shade_diffuse(point_light * li, shadedata *);
static flt directional_light_shade_diffuse(directional_light * li, shadedata *);
#endif