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RadiancePmap/source.h
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/* RCSid $Id: source.h,v 2.22 2020/12/17 03:30:37 greg Exp $ */
/*
* source.h - header file for ray tracing sources.
*
* Include after ray.h
*/
#ifndef _RAD_SOURCE_H_
#define _RAD_SOURCE_H_
#include <string.h>
#ifdef __cplusplus
extern "C" {
#endif
#ifndef AIMREQT
#define AIMREQT 100 /* required aim success/failure */
#endif
#ifndef SHADCACHE
#define SHADCACHE 20 /* shadow cache resolution */
#endif
#ifndef MINSHADCNT
#define MINSHADCNT 2 /* test at least this many shadows */
#endif
#define SDISTANT 01 /* source distant flag */
#define SSKIP 02 /* source skip flag */
#define SPROX 04 /* source proximity flag */
#define SSPOT 010 /* source spotlight flag */
#define SVIRTUAL 020 /* source virtual flag */
#define SFLAT 040 /* source flat flag */
#define SCIR 0100 /* source circular flag */
#define SCYL 0200 /* source cylindrical flag */
#define SFOLLOW 0400 /* source follow path flag */
typedef struct {
FVECT aim; /* aim direction or center */
float siz; /* output solid angle or area */
float flen; /* focal length (negative if distant source) */
} SPOT; /* spotlight */
typedef struct {
union {
struct {
FVECT u, v; /* unit vectors */
} f; /* flat source indexing */
struct {
FVECT o; /* origin position */
RREAL e1, e2; /* 1/extent */
int ax; /* major direction */
} d; /* distant source indexing */
} p; /* indexing parameters */
OBJECT obs[1]; /* cache obstructors (extends struct) */
} OBSCACHE; /* obstructor cache */
typedef struct {
FVECT sloc; /* direction or position of source */
FVECT ss[3]; /* source dimension vectors, U, V, and W */
float srad; /* maximum source radius */
float ss2; /* solid angle or projected area */
OBJREC *so; /* source destination object */
struct {
float prox; /* proximity */
SPOT *s; /* spot */
} sl; /* localized source information */
union {
long success; /* successes - AIMREQT*failures */
struct {
short pn; /* projection number */
int sn; /* next source to aim for */
} sv; /* virtual source */
} sa; /* source aiming information */
unsigned long
ntests, nhits; /* shadow tests and hits */
#ifdef SHADCACHE
OBSCACHE *obscache; /* obstructor cache */
#endif
int sflags; /* source flags */
} SRCREC; /* light source */
#define MAXSPART 64 /* maximum partitions per source */
#define SU 0 /* U vector or partition */
#define SV 1 /* V vector or partition */
#define SW 2 /* W vector or partition */
#define S0 3 /* leaf partition */
#define snorm ss[SW] /* normal vector for flat source */
typedef struct {
double dom; /* solid angle of partition */
int sn; /* source number */
short np; /* number of partitions */
short sp; /* this partition number */
unsigned char spt[MAXSPART/2]; /* source partitioning */
} SRCINDEX; /* source index structure */
#define initsrcindex(s) ((s)->sn = (s)->sp = -1, (s)->np = 0)
#define clrpart(pt) memset((char *)(pt), '\0', MAXSPART/2)
#define setpart(pt,i,v) ((pt)[(i)>>2] |= (v)<<(((i)&3)<<1))
#define spart(pt,pi) ((pt)[(pi)>>2] >> (((pi)&3)<<1) & 3)
/*
* Special support functions for sources
*/
/*
* Virtual source materials must define the following.
*
* vproj(pm, op, sp, i) Compute i'th virtual projection
* of source sp in object op and assign
* the 4x4 transformation matrix pm.
* Return 1 on success, 0 if no i'th projection.
*
* nproj The number of projections. The value of
* i passed to vproj runs from 0 to nproj-1.
*/
typedef struct {
int (*vproj)(); /* project virtual sources */
int nproj; /* number of possible projections */
} VSMATERIAL; /* virtual source material functions */
typedef struct {
void (*setsrc)(); /* set light source for object */
void (*partit)(); /* partition light source object */
double (*getpleq)(); /* plane equation for surface */
double (*getdisk)(); /* maximum disk for surface */
} SOBJECT; /* source object functions */
typedef union {
VSMATERIAL *mf; /* material functions */
SOBJECT *of; /* object functions */
} SRCFUNC; /* source functions */
extern SRCFUNC sfun[]; /* source dispatch table */
extern SRCREC *source; /* our source list */
extern int nsources; /* the number of sources */
#define sflatform(sn,dir) -DOT(source[sn].snorm, dir)
#define getplaneq(c,o) (*sfun[(o)->otype].of->getpleq)(c,o)
#define getmaxdisk(c,o) (*sfun[(o)->otype].of->getdisk)(c,o)
#define setsource(s,o) (*sfun[(o)->otype].of->setsrc)(s,o)
/* defined in source.c */
extern void marksources(void);
extern void distantsources(void);
extern void freesources(void);
extern int srcray(RAY *sr, RAY *r, SRCINDEX *si);
extern void srcvalue(RAY *r);
extern int sourcehit(RAY *r);
typedef void srcdirf_t(COLOR cv, void *np, FVECT ldir, double omega);
extern void direct(RAY *r, srcdirf_t *f, void *p);
extern void srcscatter(RAY *r);
extern int m_light(OBJREC *m, RAY *r);
/* defined in srcobstr.c */
extern void initobscache(int sn);
extern int srcblocker(RAY *r);
extern int srcblocked(RAY *r);
extern void freeobscache(SRCREC *s);
extern void markclip(OBJREC *m);
/* defined in srcsamp.c */
extern double nextssamp(RAY *r, SRCINDEX *si);
extern int skipparts(int ct[3], int sz[3], int pp[2], unsigned char *pt);
extern void nopart(SRCINDEX *si, RAY *r);
extern void cylpart(SRCINDEX *si, RAY *r);
extern void flatpart(SRCINDEX *si, RAY *r);
extern double scylform(int sn, FVECT dir);
/* defined in srcsupp.c */
extern void initstypes(void);
extern int newsource(void);
extern void setflatss(SRCREC *src);
extern void fsetsrc(SRCREC *src, OBJREC *so);
extern void ssetsrc(SRCREC *src, OBJREC *so);
extern void sphsetsrc(SRCREC *src, OBJREC *so);
extern void rsetsrc(SRCREC *src, OBJREC *so);
extern void cylsetsrc(SRCREC *src, OBJREC *so);
extern SPOT *makespot(OBJREC *m);
extern int spotout(RAY *r, SPOT *s);
extern double fgetmaxdisk(FVECT ocent, OBJREC *op);
extern double rgetmaxdisk(FVECT ocent, OBJREC *op);
extern double fgetplaneq(FVECT nvec, OBJREC *op);
extern double rgetplaneq(FVECT nvec, OBJREC *op);
extern int commonspot(SPOT *sp1, SPOT *sp2, FVECT org);
extern int commonbeam(SPOT *sp1, SPOT *sp2, FVECT org);
extern int checkspot(SPOT *sp, FVECT nrm);
extern double spotdisk(FVECT oc, OBJREC *op, SPOT *sp, FVECT pos);
extern double beamdisk(FVECT oc, OBJREC *op, SPOT *sp, FVECT dir);
extern double intercircle(FVECT cc, FVECT c1, FVECT c2,
double r1s, double r2s);
/* defined in virtuals.c */
extern void markvirtuals(void);
extern void addvirtuals(int sn, int nr);
extern void vproject(OBJREC *o, int sn, int n);
extern OBJREC *vsmaterial(OBJREC *o);
extern int makevsrc(OBJREC *op, int sn, MAT4 pm);
extern double getdisk(FVECT oc, OBJREC *op, int sn);
extern int vstestvis(int f, OBJREC *o, FVECT oc, double or2, int sn);
extern void virtverb(int sn, FILE *fp);
#ifdef __cplusplus
}
#endif
#endif /* _RAD_SOURCE_H_ */
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