| 1 |
/* Copyright (c) 1986 Regents of the University of California */ |
| 2 |
|
| 3 |
/* SCCSid "$SunId$ LBL" */ |
| 4 |
|
| 5 |
/* |
| 6 |
* source.h - header file for ray tracing sources. |
| 7 |
* |
| 8 |
* 8/20/85 |
| 9 |
*/ |
| 10 |
|
| 11 |
#define AIMREQT 100 /* required aim success/failure */ |
| 12 |
|
| 13 |
#define SDISTANT 01 /* source distant flag */ |
| 14 |
#define SSKIP 02 /* source skip flag */ |
| 15 |
#define SPROX 04 /* source proximity flag */ |
| 16 |
#define SSPOT 010 /* source spotlight flag */ |
| 17 |
#define SVIRTUAL 020 /* source virtual flag */ |
| 18 |
#define SFLAT 040 /* source flat flag */ |
| 19 |
#define SCYL 0100 /* source cylindrical flag */ |
| 20 |
#define SFOLLOW 0200 /* source follow path flag */ |
| 21 |
|
| 22 |
typedef struct { |
| 23 |
FVECT aim; /* aim direction or center */ |
| 24 |
float siz; /* output solid angle or area */ |
| 25 |
float flen; /* focal length */ |
| 26 |
} SPOT; /* spotlight */ |
| 27 |
|
| 28 |
typedef struct { |
| 29 |
int sflags; /* source flags */ |
| 30 |
FVECT sloc; /* direction or position of source */ |
| 31 |
FVECT ss[3]; /* source dimension vectors, U, V, and W */ |
| 32 |
float srad; /* maximum source radius */ |
| 33 |
float ss2; /* solid angle or projected area */ |
| 34 |
struct { |
| 35 |
float prox; /* proximity */ |
| 36 |
SPOT *s; /* spot */ |
| 37 |
} sl; /* localized source information */ |
| 38 |
union { |
| 39 |
int success; /* successes - AIMREQT*failures */ |
| 40 |
struct { |
| 41 |
short pn; /* projection number */ |
| 42 |
short sn; /* next source to aim for */ |
| 43 |
} sv; /* virtual source */ |
| 44 |
} sa; /* source aiming information */ |
| 45 |
long ntests, nhits; /* shadow tests and hits */ |
| 46 |
OBJREC *so; /* source destination object */ |
| 47 |
} SRCREC; /* light source */ |
| 48 |
|
| 49 |
#define MAXSPART 64 /* maximum partitions per source */ |
| 50 |
|
| 51 |
#define SU 0 /* U vector or partition */ |
| 52 |
#define SV 1 /* V vector or partition */ |
| 53 |
#define SW 2 /* W vector or partition */ |
| 54 |
#define S0 3 /* leaf partition */ |
| 55 |
|
| 56 |
#define snorm ss[SW] /* normal vector for flat source */ |
| 57 |
|
| 58 |
typedef struct { |
| 59 |
int sn; /* source number */ |
| 60 |
short np; /* number of partitions */ |
| 61 |
short sp; /* this partition number */ |
| 62 |
double dom; /* solid angle of partition */ |
| 63 |
unsigned char spt[MAXSPART/2]; /* source partitioning */ |
| 64 |
} SRCINDEX; /* source index structure */ |
| 65 |
|
| 66 |
#define initsrcindex(s) ((s)->sn = (s)->sp = -1, (s)->np = 0) |
| 67 |
|
| 68 |
#define clrpart(pt) bzero((char *)(pt), MAXSPART/2) |
| 69 |
#define setpart(pt,i,v) ((pt)[(i)>>2] |= (v)<<(((i)&3)<<1)) |
| 70 |
#define spart(pt,pi) ((pt)[(pi)>>2] >> (((pi)&3)<<1) & 3) |
| 71 |
|
| 72 |
/* |
| 73 |
* Special support functions for sources |
| 74 |
*/ |
| 75 |
|
| 76 |
/* |
| 77 |
* Virtual source materials must define the following. |
| 78 |
* |
| 79 |
* vproj(pm, op, sp, i) Compute i'th virtual projection |
| 80 |
* of source sp in object op and assign |
| 81 |
* the 4x4 transformation matrix pm. |
| 82 |
* Return 1 on success, 0 if no i'th projection. |
| 83 |
* |
| 84 |
* nproj The number of projections. The value of |
| 85 |
* i passed to vproj runs from 0 to nproj-1. |
| 86 |
*/ |
| 87 |
|
| 88 |
typedef struct { |
| 89 |
int (*vproj)(); /* project virtual sources */ |
| 90 |
int nproj; /* number of possible projections */ |
| 91 |
} VSMATERIAL; /* virtual source material functions */ |
| 92 |
|
| 93 |
typedef struct { |
| 94 |
int (*setsrc)(); /* set light source for object */ |
| 95 |
int (*partit)(); /* partition light source object */ |
| 96 |
double (*getpleq)(); /* plane equation for surface */ |
| 97 |
double (*getdisk)(); /* maximum disk for surface */ |
| 98 |
} SOBJECT; /* source object functions */ |
| 99 |
|
| 100 |
typedef union { |
| 101 |
VSMATERIAL *mf; /* material functions */ |
| 102 |
SOBJECT *of; /* object functions */ |
| 103 |
} SRCFUNC; /* source functions */ |
| 104 |
|
| 105 |
extern SRCFUNC sfun[]; /* source dispatch table */ |
| 106 |
|
| 107 |
extern SRCREC *source; /* our source list */ |
| 108 |
extern int nsources; /* the number of sources */ |
| 109 |
|
| 110 |
extern int srcvalue(); /* compute source value w/o shadows */ |
| 111 |
extern double nextssamp(); /* get next source sample location */ |
| 112 |
extern double scylform(); /* cosine to axis of cylinder */ |
| 113 |
|
| 114 |
#define sflatform(sn,dir) -DOT(source[sn].snorm, dir) |
| 115 |
|
| 116 |
extern double intercircle(); /* intersect two circles */ |
| 117 |
extern double spotdisk(); /* intersecting disk for spot */ |
| 118 |
extern double beamdisk(); /* intersecting disk for beam */ |
| 119 |
|
| 120 |
extern SPOT *makespot(); /* make spotlight */ |
| 121 |
|
| 122 |
extern double dstrsrc; /* source distribution amount */ |
| 123 |
extern double shadthresh; /* relative shadow threshold */ |
| 124 |
extern double shadcert; /* shadow testing certainty */ |
| 125 |
extern double srcsizerat; /* max. ratio of source size/dist. */ |
| 126 |
extern int directrelay; /* maximum number of source relays */ |
| 127 |
extern int vspretest; /* virtual source pretest density */ |
| 128 |
extern int directinvis; /* sources invisible? */ |
| 129 |
|
| 130 |
#define getplaneq(c,o) (*sfun[(o)->otype].of->getpleq)(c,o) |
| 131 |
#define getmaxdisk(c,o) (*sfun[(o)->otype].of->getdisk)(c,o) |
| 132 |
#define setsource(s,o) (*sfun[(o)->otype].of->setsrc)(s,o) |
