src/rt/source.h

/* Copyright (c) 1986 Regents of the University of California */

/* SCCSid "$SunId$ LBL" */

/*
 *  source.h - header file for ray tracing sources.
 *
 *     8/20/85
 */

#define  AIMREQT        100             /* required aim success/failure */

#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  SCYL           0100            /* source cylindrical flag */
#define  SFOLLOW        0200            /* source follow path flag */

typedef struct {
        FVECT  aim;             /* aim direction or center */
        float  siz;             /* output solid angle or area */
        float  flen;            /* focal length */
} SPOT;                 /* spotlight */

typedef struct {
        int  sflags;            /* source flags */
        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 */
        struct {
                float  prox;            /* proximity */
                SPOT  *s;               /* spot */
        } sl;                   /* localized source information */
        union {
                int  success;           /* successes - AIMREQT*failures */
                struct {
                        short  pn;              /* projection number */
                        short  sn;              /* next source to aim for */
                }  sv;                  /* virtual source */
        } sa;                   /* source aiming information */
        long  ntests, nhits;    /* shadow tests and hits */
        OBJREC  *so;            /* source destination object */
}  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 {
        int  sn;                                /* source number */
        short  np;                              /* number of partitions */
        short  sp;                              /* this partition number */
        double  dom;                            /* solid angle of partition */
        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)     bzero((char *)(pt), 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 {
        int     (*setsrc)();    /* set light source for object */
        int     (*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 */

extern int  srcvalue();                 /* compute source value w/o shadows */
extern double  nextssamp();             /* get next source sample location */
extern double  scylform();              /* cosine to axis of cylinder */

#define  sflatform(sn,dir)      -DOT(source[sn].snorm, dir)

extern double  intercircle();           /* intersect two circles */
extern double  spotdisk();              /* intersecting disk for spot */
extern double  beamdisk();              /* intersecting disk for beam */

extern SPOT  *makespot();               /* make spotlight */

extern double  dstrsrc;                 /* source distribution amount */
extern double  shadthresh;              /* relative shadow threshold */
extern double  shadcert;                /* shadow testing certainty */
extern double  srcsizerat;              /* max. ratio of source size/dist. */
extern int  directrelay;                /* maximum number of source relays */
extern int  vspretest;                  /* virtual source pretest density */
extern int  directinvis;                /* sources invisible? */

#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)
Revision:	1.15
Committed:	Mon Oct 21 14:27:34 1991 UTC (34 years ago) by greg
Content type:	text/plain
Branch:	MAIN
Changes since 1.14:	+1 -1 lines
Log Message:	changed maximum sampling and strategy
#	User	Rev	Content
1	greg	1.1	/* 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	greg	1.6	#define AIMREQT 100 /* required aim success/failure */
12
13	greg	1.1	#define SDISTANT 01 /* source distant flag */
14			#define SSKIP 02 /* source skip flag */
15	greg	1.3	#define SPROX 04 /* source proximity flag */
16			#define SSPOT 010 /* source spotlight flag */
17	greg	1.6	#define SVIRTUAL 020 /* source virtual flag */
18			#define SFLAT 040 /* source flat flag */
19	greg	1.14	#define SCYL 0100 /* source cylindrical flag */
20			#define SFOLLOW 0200 /* source follow path flag */
21	greg	1.1
22			typedef struct {
23	greg	1.6	FVECT aim; /* aim direction or center */
24			float siz; /* output solid angle or area */
25	greg	1.3	float flen; /* focal length */
26			} SPOT; /* spotlight */
27
28			typedef struct {
29	greg	1.6	int sflags; /* source flags */
30	greg	1.1	FVECT sloc; /* direction or position of source */
31	greg	1.14	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	greg	1.6	struct {
35	greg	1.3	float prox; /* proximity */
36			SPOT s; / spot */
37			} sl; /* localized source information */
38	greg	1.6	union {
39			int success; /* successes - AIMREQTfailures /
40	greg	1.12	struct {
41			short pn; /* projection number */
42			short sn; /* next source to aim for */
43			} sv; /* virtual source */
44	greg	1.6	} sa; /* source aiming information */
45	greg	1.2	long ntests, nhits; /* shadow tests and hits */
46	greg	1.6	OBJREC so; / source destination object */
47	greg	1.2	} SRCREC; /* light source */
48	greg	1.1
49	greg	1.15	#define MAXSPART 64 /* maximum partitions per source */
50	greg	1.14
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	greg	1.8	/*
73			* Special support functions for sources
74			*/
75
76			/*
77	greg	1.10	* Virtual source materials must define the following.
78	greg	1.8	*
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	greg	1.2	typedef struct {
89	greg	1.8	int (vproj)(); / project virtual sources */
90			int nproj; /* number of possible projections */
91			} VSMATERIAL; /* virtual source material functions */
92	greg	1.4
93			typedef struct {
94	greg	1.8	int (setsrc)(); / set light source for object */
95	greg	1.14	int (partit)(); / partition light source object */
96	greg	1.8	double (getpleq)(); / plane equation for surface */
97			double (getdisk)(); / maximum disk for surface */
98			} SOBJECT; /* source object functions */
99	greg	1.1
100	greg	1.8	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	greg	1.2	extern SRCREC source; / our source list */
108	greg	1.1	extern int nsources; /* the number of sources */
109
110	greg	1.10	extern int srcvalue(); /* compute source value w/o shadows */
111	greg	1.14	extern double nextssamp(); /* get next source sample location */
112			extern double scylform(); /* cosine to axis of cylinder */
113	greg	1.3
114	greg	1.14	#define sflatform(sn,dir) -DOT(source[sn].snorm, dir)
115
116	greg	1.10	extern double intercircle(); /* intersect two circles */
117	greg	1.11	extern double spotdisk(); /* intersecting disk for spot */
118			extern double beamdisk(); /* intersecting disk for beam */
119	greg	1.10
120	greg	1.3	extern SPOT makespot(); / make spotlight */
121	greg	1.6
122	greg	1.8	extern double dstrsrc; /* source distribution amount */
123			extern double shadthresh; /* relative shadow threshold */
124			extern double shadcert; /* shadow testing certainty */
125	greg	1.14	extern double srcsizerat; /* max. ratio of source size/dist. */
126	greg	1.8	extern int directrelay; /* maximum number of source relays */
127	greg	1.10	extern int vspretest; /* virtual source pretest density */
128	greg	1.13	extern int directinvis; /* sources invisible? */
129	greg	1.11
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)