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/* RCSid $Id: source.h,v 2.27 2025/01/18 03:49:00 greg Exp $ */ |
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/* |
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* source.h - header file for ray tracing sources. |
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* |
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* Include after ray.h |
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*/ |
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#ifndef _RAD_SOURCE_H_ |
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#define _RAD_SOURCE_H_ |
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|
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#include <string.h> |
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|
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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|
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#ifndef AIMREQT |
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#define AIMREQT 100 /* required aim success/failure */ |
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#endif |
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#ifndef SHADCACHE |
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#define SHADCACHE 20 /* shadow cache resolution */ |
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#endif |
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#ifndef MINSHADCNT |
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#define MINSHADCNT 2 /* test at least this many shadows */ |
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#endif |
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|
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#define SDISTANT 01 /* source distant flag */ |
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#define SSKIP 02 /* source skip flag */ |
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#define SPROX 04 /* source proximity flag */ |
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#define SSPOT 010 /* source spotlight flag */ |
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#define SVIRTUAL 020 /* source virtual flag */ |
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#define SFLAT 040 /* source flat flag */ |
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#define SCIR 0100 /* source circular flag */ |
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#define SCYL 0200 /* source cylindrical flag */ |
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#define SFOLLOW 0400 /* source follow path flag */ |
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|
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typedef struct { |
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FVECT aim; /* aim direction or center */ |
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float siz; /* output solid angle or area */ |
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float flen; /* focal length (negative if distant source) */ |
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} SPOT; /* spotlight */ |
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|
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typedef struct { |
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union { |
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struct { |
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FVECT u, v; /* unit vectors */ |
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} f; /* flat source indexing */ |
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struct { |
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FVECT o; /* origin position */ |
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RREAL e1, e2; /* 1/extent */ |
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int ax; /* major direction */ |
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} d; /* distant source indexing */ |
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} p; /* indexing parameters */ |
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OBJECT obs[1]; /* cache obstructors (extends struct) */ |
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} OBSCACHE; /* obstructor cache */ |
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|
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typedef struct { |
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FVECT sloc; /* direction or position of source */ |
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FVECT ss[3]; /* source dimension vectors, U, V, and W */ |
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float srad; /* maximum source radius */ |
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float ss2; /* solid angle or projected area */ |
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OBJREC *so; /* source destination object */ |
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struct { |
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float prox; /* proximity */ |
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SPOT *s; /* spot */ |
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} sl; /* localized source information */ |
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union { |
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long success; /* successes - AIMREQT*failures */ |
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struct { |
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short pn; /* projection number */ |
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int sn; /* next source to aim for */ |
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} sv; /* virtual source */ |
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} sa; /* source aiming information */ |
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unsigned long |
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ntests, nhits; /* shadow tests and hits */ |
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#if SHADCACHE |
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OBSCACHE *obscache; /* obstructor cache */ |
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#endif |
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int sflags; /* source flags */ |
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} SRCREC; /* light source */ |
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|
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#define MAXSPART 64 /* maximum partitions per source */ |
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|
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#define SU 0 /* U vector or partition */ |
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#define SV 1 /* V vector or partition */ |
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#define SW 2 /* W vector or partition */ |
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#define S0 3 /* leaf partition */ |
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|
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#define snorm ss[SW] /* normal vector for flat source */ |
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|
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typedef struct { |
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double dom; /* solid angle of partition */ |
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int sn; /* source number */ |
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short np; /* number of partitions */ |
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short sp; /* this partition number */ |
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unsigned char spt[MAXSPART/2]; /* source partitioning */ |
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} SRCINDEX; /* source index structure */ |
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|
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#define initsrcindex(s) ((s)->sn = (s)->sp = -1, (s)->np = 0) |
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|
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#define clrpart(pt) memset((char *)(pt), '\0', MAXSPART/2) |
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#define setpart(pt,i,v) ((pt)[(i)>>2] |= (v)<<(((i)&3)<<1)) |
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#define spart(pt,pi) ((pt)[(pi)>>2] >> (((pi)&3)<<1) & 3) |
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|
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/* |
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* Special support functions for sources |
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*/ |
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|
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/* |
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* Virtual source materials must define the following. |
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* |
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* vproj(pm, op, sp, i) Compute i'th virtual projection |
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* of source sp in object op and assign |
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* the 4x4 transformation matrix pm. |
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* Return 1 on success, 0 if no i'th projection. |
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* |
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* nproj The number of projections. The value of |
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* i passed to vproj runs from 0 to nproj-1. |
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*/ |
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|
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typedef struct { /* project virtual sources */ |
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int (*vproj)(MAT4,OBJREC*,SRCREC*,int); |
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int nproj; /* number of possible projections */ |
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} VSMATERIAL; /* virtual source material functions */ |
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|
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typedef struct { |
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void (*setsrc)(SRCREC*,OBJREC*); /* set light source for object */ |
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void (*partit)(SRCINDEX*,RAY*); /* partition light source object */ |
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double (*getpleq)(FVECT,OBJREC*); /* plane equation for surface */ |
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double (*getdisk)(FVECT,OBJREC*); /* maximum disk for surface */ |
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} SOBJECT; /* source object functions */ |
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|
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typedef union { |
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VSMATERIAL *mf; /* material functions */ |
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SOBJECT *of; /* object functions */ |
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} SRCFUNC; /* source functions */ |
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|
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extern SRCFUNC sfun[]; /* source dispatch table */ |
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|
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extern SRCREC *source; /* our source list */ |
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extern int nsources; /* the number of sources */ |
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|
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#define sflatform(sn,dir) -DOT(source[sn].snorm, dir) |
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|
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#define getplaneq(c,o) (*sfun[(o)->otype].of->getpleq)(c,o) |
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#define getmaxdisk(c,o) (*sfun[(o)->otype].of->getdisk)(c,o) |
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#define setsource(s,o) (*sfun[(o)->otype].of->setsrc)(s,o) |
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|
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/* defined in source.c */ |
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extern void marksources(void); |
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extern void distantsources(void); |
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extern void freesources(void); |
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extern int srcray(RAY *sr, RAY *r, SRCINDEX *si); |
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extern void srcvalue(RAY *r); |
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extern int sourcehit(RAY *r); |
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typedef void srcdirf_t(SCOLOR cv, void *np, FVECT ldir, double omega); |
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extern void direct(RAY *r, srcdirf_t *f, void *p); |
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extern void srcscatter(RAY *r); |
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extern int m_light(OBJREC *m, RAY *r); |
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/* defined in srcobstr.c */ |
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extern void initobscache(int sn); |
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extern int srcblocker(RAY *r); |
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extern int srcblocked(RAY *r); |
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extern void freeobscache(SRCREC *s); |
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extern void markclip(OBJREC *m); |
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/* defined in srcsamp.c */ |
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extern int srcskip(int sn, RAY *r); |
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extern double nextssamp(RAY *r, SRCINDEX *si); |
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extern int skipparts(int ct[3], int sz[3], int pp[2], unsigned char *pt); |
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extern void nopart(SRCINDEX *si, RAY *r); |
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extern void cylpart(SRCINDEX *si, RAY *r); |
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extern void flatpart(SRCINDEX *si, RAY *r); |
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extern double scylform(int sn, FVECT dir); |
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/* defined in srcskipload.c */ |
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extern int sskip_dim[2]; /* source skip image size */ |
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extern int srcskip_open(char *bmpspec, char *scorrimg); |
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extern int srcskip_getrow(int row, int *sndx, float *scorr); |
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extern int *srcskip_ndxmap(void); |
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extern float *srcskip_corrmap(void); |
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extern void srcskip_close(void); |
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extern void srcskip_free_maps(void); |
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/* defined in srcsupp.c */ |
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extern void initstypes(void); |
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extern int newsource(void); |
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extern void setflatss(SRCREC *src); |
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extern void fsetsrc(SRCREC *src, OBJREC *so); |
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extern void ssetsrc(SRCREC *src, OBJREC *so); |
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extern void sphsetsrc(SRCREC *src, OBJREC *so); |
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extern void rsetsrc(SRCREC *src, OBJREC *so); |
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extern void cylsetsrc(SRCREC *src, OBJREC *so); |
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extern SPOT *makespot(OBJREC *m); |
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extern int spotout(RAY *r, SPOT *s); |
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extern double fgetmaxdisk(FVECT ocent, OBJREC *op); |
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extern double rgetmaxdisk(FVECT ocent, OBJREC *op); |
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extern double fgetplaneq(FVECT nvec, OBJREC *op); |
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extern double rgetplaneq(FVECT nvec, OBJREC *op); |
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extern int commonspot(SPOT *sp1, SPOT *sp2, FVECT org); |
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extern int commonbeam(SPOT *sp1, SPOT *sp2, FVECT org); |
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extern int checkspot(SPOT *sp, FVECT nrm); |
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extern double spotdisk(FVECT oc, OBJREC *op, SPOT *sp, FVECT pos); |
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extern double beamdisk(FVECT oc, OBJREC *op, SPOT *sp, FVECT dir); |
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extern double intercircle(FVECT cc, FVECT c1, FVECT c2, |
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double r1s, double r2s); |
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/* defined in virtuals.c */ |
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extern void markvirtuals(void); |
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extern void addvirtuals(int sn, int nr); |
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extern void vproject(OBJREC *o, int sn, int n); |
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extern OBJREC *vsmaterial(OBJREC *o); |
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extern int makevsrc(OBJREC *op, int sn, MAT4 pm); |
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extern double getdisk(FVECT oc, OBJREC *op, int sn); |
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extern int vstestvis(int f, OBJREC *o, FVECT oc, double or2, int sn); |
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extern void virtverb(int sn, FILE *fp); |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* _RAD_SOURCE_H_ */ |
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