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/* Copyright (c) 1986 Regents of the University of California */ |
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/* Copyright (c) 1995 Regents of the University of California */ |
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/* SCCSid "$SunId$ LBL" */ |
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* 8/20/85 |
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*/ |
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#define AIMREQT 100 /* required aim success/failure */ |
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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 SCYL 0100 /* source cylindrical flag */ |
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#define SFOLLOW 0200 /* source follow path flag */ |
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typedef struct { |
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float siz; /* output solid angle */ |
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float flen; /* focal length */ |
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FVECT aim; /* aim direction */ |
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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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typedef struct { |
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short sflags; /* source flags */ |
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int sflags; /* source flags */ |
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FVECT sloc; /* direction or position of source */ |
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float ss; /* tangent or disk radius */ |
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float ss2; /* domega or projected area */ |
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union { |
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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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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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long ntests, nhits; /* shadow tests and hits */ |
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OBJREC *so; /* source object */ |
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OBJREC *so; /* source destination object */ |
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} SRCREC; /* light source */ |
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#define MAXSPART 64 /* maximum partitions per source */ |
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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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#define snorm ss[SW] /* normal vector for flat source */ |
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typedef struct { |
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FVECT dir; /* source direction */ |
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float dom; /* domega for source */ |
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COLOR val; /* contribution */ |
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} CONTRIB; /* direct contribution */ |
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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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double dom; /* solid angle of partition */ |
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unsigned char spt[MAXSPART/2]; /* source partitioning */ |
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} SRCINDEX; /* source index structure */ |
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#define initsrcindex(s) ((s)->sn = (s)->sp = -1, (s)->np = 0) |
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#define clrpart(pt) bzero((char *)(pt), 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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* Special support functions for sources |
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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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typedef struct { |
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int sno; /* source number */ |
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float brt; /* brightness (for comparison) */ |
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} CNTPTR; /* contribution pointer */ |
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int (*vproj)(); /* project virtual sources */ |
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int nproj; /* number of possible projections */ |
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} VSMATERIAL; /* virtual source material functions */ |
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typedef struct { |
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int (*setsrc)(); /* set light source for object */ |
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int (*partit)(); /* partition light source object */ |
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double (*getpleq)(); /* plane equation for surface */ |
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double (*getdisk)(); /* maximum disk for surface */ |
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} SOBJECT; /* source object functions */ |
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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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extern SRCFUNC sfun[]; /* source dispatch table */ |
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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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extern double srcray(); /* ray to source */ |
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extern int srcvalue(); /* compute source value w/o shadows */ |
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extern double nextssamp(); /* get next source sample location */ |
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extern double scylform(); /* cosine to axis of cylinder */ |
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#define sflatform(sn,dir) -DOT(source[sn].snorm, dir) |
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extern OBJREC *vsmaterial(); /* virtual source material */ |
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extern double intercircle(); /* intersect two circles */ |
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extern double spotdisk(); /* intersecting disk for spot */ |
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extern double beamdisk(); /* intersecting disk for beam */ |
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extern SPOT *makespot(); /* make spotlight */ |
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extern double dstrsrc; /* source distribution amount */ |
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extern double shadthresh; /* relative shadow threshold */ |
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extern double shadcert; /* shadow testing certainty */ |
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extern double srcsizerat; /* max. ratio of source size/dist. */ |
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extern int directrelay; /* maximum number of source relays */ |
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extern int vspretest; /* virtual source pretest density */ |
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extern int directvis; /* sources visible? */ |
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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) |
