src/hd/rholo3.c

#ifndef lint
static const char       RCSid[] = "$Id: rholo3.c,v 3.41 2004/01/01 11:21:55 schorsch Exp $";
#endif
/*
 * Routines for tracking beam compuatations
 */

#include "rholo.h"

#ifndef NFRAG2CHUNK
#define NFRAG2CHUNK     4096    /* number of fragments to start chunking */
#endif

#ifndef abs
#define abs(x)          ((x) > 0 ? (x) : -(x))
#endif
#ifndef sgn
#define sgn(x)          ((x) > 0 ? 1 : (x) < 0 ? -1 : 0)
#endif

#define rchunk(n)       (((n)+(RPACKSIZ/2))/RPACKSIZ)

int     chunkycmp = 0;          /* clump beams together on disk */

static PACKHEAD *complist=NULL; /* list of beams to compute */
static int      complen=0;      /* length of complist */
static int      listpos=0;      /* current list position for next_packet */
static int      lastin= -1;     /* last ordered position in list */

static void sortcomplist(void);
static void mergeclists(PACKHEAD *cdest, PACKHEAD *cl1, int n1, PACKHEAD *cl2, int n2);
static void view_list(FILE      *fp);
static void ambient_list(void);
static double beamvolume(HOLO   *hp, int        bi);
static void dispbeam(BEAM       *b, HDBEAMI     *hb);


static int
beamcmp(b0, b1)                         /* comparison for compute order */
register PACKHEAD       *b0, *b1;
{
        BEAMI   *bip0, *bip1;
        register long   c;
                                        /* first check desired quantities */
        if (chunkycmp)
                c = rchunk(b1->nr)*(rchunk(b0->nc)+1L) -
                                rchunk(b0->nr)*(rchunk(b1->nc)+1L);
        else
                c = b1->nr*(b0->nc+1L) - b0->nr*(b1->nc+1L);
        if (c > 0) return(1);
        if (c < 0) return(-1);
                                /* only one file, so skip the following: */
#if 0
                                        /* next, check file descriptors */
        c = hdlist[b0->hd]->fd - hdlist[b1->hd]->fd;
        if (c) return(c);
#endif
                                        /* finally, check file positions */
        bip0 = &hdlist[b0->hd]->bi[b0->bi];
        bip1 = &hdlist[b1->hd]->bi[b1->bi];
                                        /* put diskless beams last */
        if (!bip0->nrd)
                return(bip1->nrd > 0);
        if (!bip1->nrd)
                return(-1);
        c = bip0->fo - bip1->fo;
        return(c < 0 ? -1 : c > 0);
}


int
beamidcmp(b0, b1)                       /* comparison for beam searching */
register PACKHEAD       *b0, *b1;
{
        register int    c = b0->hd - b1->hd;

        if (c) return(c);
        return(b0->bi - b1->bi);
}


static void
dispbeam(                               /* display a holodeck beam */
        register BEAM   *b,
        register HDBEAMI        *hb
)
{
        static int      n = 0;
        static PACKHEAD *p = NULL;

        if (b == NULL)
                return;
        if (b->nrm > n) {               /* (re)allocate packet holder */
                n = b->nrm;
                if (p == NULL) p = (PACKHEAD *)malloc(packsiz(n));
                else p = (PACKHEAD *)realloc((void *)p, packsiz(n));
                CHECK(p==NULL, SYSTEM, "out of memory in dispbeam");
        }
                                        /* assign packet fields */
        memcpy((void *)packra(p), (void *)hdbray(b), b->nrm*sizeof(RAYVAL));
        p->nr = p->nc = b->nrm;
        for (p->hd = 0; hdlist[p->hd] != hb->h; p->hd++)
                if (hdlist[p->hd] == NULL)
                        error(CONSISTENCY, "unregistered holodeck in dispbeam");
        p->bi = hb->b;
        disp_packet(p);                 /* display it */
        if (n >= 1024) {                /* free ridiculous packets */
                free((void *)p);
                p = NULL; n = 0;
        }
}


extern void
bundle_set(     /* bundle set operation */
        int     op,
        PACKHEAD        *clist,
        int     nents
)
{
        int     oldnr, n;
        HDBEAMI *hbarr;
        register PACKHEAD       *csm;
        register int    i;
                                        /* search for common members */
        for (csm = clist+nents; csm-- > clist; )
                csm->nc = -1;
        qsort((void *)clist, nents, sizeof(PACKHEAD), beamidcmp);
        for (i = 0; i < complen; i++) {
                csm = (PACKHEAD *)bsearch((void *)(complist+i), (void *)clist,
                                nents, sizeof(PACKHEAD), beamidcmp);
                if (csm == NULL)
                        continue;
                oldnr = complist[i].nr;
                csm->nc = complist[i].nc;
                switch (op) {
                case BS_ADD:            /* add to count */
                        complist[i].nr += csm->nr;
                        csm->nr = 0;
                        break;
                case BS_MAX:            /* maximum of counts */
                        if (csm->nr > complist[i].nr)
                                complist[i].nr = csm->nr;
                        csm->nr = 0;
                        break;
                case BS_ADJ:            /* reset count */
                        complist[i].nr = csm->nr;
                        csm->nr = 0;
                        break;
                case BS_DEL:            /* delete count */
                        if (csm->nr == 0 || csm->nr >= complist[i].nr)
                                complist[i].nr = 0;
                        else
                                complist[i].nr -= csm->nr;
                        break;
                }
                if (complist[i].nr != oldnr)
                        lastin = -1;    /* flag sort */
        }
                                /* record computed rays for uncommon beams */
        for (csm = clist+nents; csm-- > clist; )
                if (csm->nc < 0)
                        csm->nc = bnrays(hdlist[csm->hd], csm->bi);
                                /* complete list operations */
        switch (op) {
        case BS_NEW:                    /* new computation set */
                listpos = 0; lastin = -1;
                if (complen)            /* free old list */
                        free((void *)complist);
                complist = NULL;
                if (!(complen = nents))
                        return;
                complist = (PACKHEAD *)malloc(nents*sizeof(PACKHEAD));
                if (complist == NULL)
                        goto memerr;
                memcpy((void *)complist, (void *)clist, nents*sizeof(PACKHEAD));
                break;
        case BS_ADD:                    /* add to computation set */
        case BS_MAX:                    /* maximum of quantities */
        case BS_ADJ:                    /* adjust set quantities */
                if (nents <= 0)
                        return;
                sortcomplist();         /* sort updated list & new entries */
                qsort((void *)clist, nents, sizeof(PACKHEAD), beamcmp);
                                        /* what can't we satisfy? */
                for (i = nents, csm = clist; i-- && csm->nr > csm->nc; csm++)
                        ;
                n = csm - clist;
                if (op != BS_ADD) {     /* don't regenerate adjusted beams */
                        for (++i; i-- && csm->nr > 0; csm++)
                                ;
                        nents = csm - clist;
                }
                if (n) {                /* allocate space for merged list */
                        PACKHEAD        *newlist;
                        newlist = (PACKHEAD *)malloc(
                                        (complen+n)*sizeof(PACKHEAD) );
                        if (newlist == NULL)
                                goto memerr;
                                                /* merge lists */
                        mergeclists(newlist, clist, n, complist, complen);
                        if (complen)
                                free((void *)complist);
                        complist = newlist;
                        complen += n;
                }
                listpos = 0;
                lastin = complen-1;     /* list is now sorted */
                break;
        case BS_DEL:                    /* delete from computation set */
                return;                 /* already done */
        default:
                error(CONSISTENCY, "bundle_set called with unknown operation");
        }
        if (outdev == NULL || !nents)   /* nothing to display? */
                return;
                                        /* load and display beams we have */
        hbarr = (HDBEAMI *)malloc(nents*sizeof(HDBEAMI));
        for (i = nents; i--; ) {
                hbarr[i].h = hdlist[clist[i].hd];
                hbarr[i].b = clist[i].bi;
        }
        hdloadbeams(hbarr, nents, dispbeam);
        free((void *)hbarr);
        if (hdfragflags&FF_READ) {
                listpos = 0;
                lastin = -1;            /* need to re-sort list */
        }
        return;
memerr:
        error(SYSTEM, "out of memory in bundle_set");
}


static double
beamvolume(     /* compute approximate volume of a beam */
        HOLO    *hp,
        int     bi
)
{
        GCOORD  gc[2];
        FVECT   cp[4], edgeA, edgeB, cent[2];
        FVECT   crossp[2], diffv;
        double  vol[2];
        register int    i;
                                        /* get grid coordinates */
        if (!hdbcoord(gc, hp, bi))
                error(CONSISTENCY, "bad beam index in beamvolume");
        for (i = 0; i < 2; i++) {       /* compute cell area vectors */
                hdcell(cp, hp, gc+i);
                VSUM(edgeA, cp[1], cp[0], -1.0);
                VSUM(edgeB, cp[3], cp[1], -1.0);
                fcross(crossp[i], edgeA, edgeB);
                                        /* compute center */
                cent[i][0] = 0.5*(cp[0][0] + cp[2][0]);
                cent[i][1] = 0.5*(cp[0][1] + cp[2][1]);
                cent[i][2] = 0.5*(cp[0][2] + cp[2][2]);
        }
                                        /* compute difference vector */
        VSUM(diffv, cent[1], cent[0], -1.0);
        for (i = 0; i < 2; i++) {       /* compute volume contributions */
                vol[i] = 0.5*DOT(crossp[i], diffv);
                if (vol[i] < 0.) vol[i] = -vol[i];
        }
        return(vol[0] + vol[1]);        /* return total volume */
}


static void
ambient_list(void)                      /* compute ambient beam list */
{
        int32   wtotal, minrt;
        double  frac;
        int     i;
        register int    j, k;

        complen = 0;
        for (j = 0; hdlist[j] != NULL; j++)
                complen += nbeams(hdlist[j]);
        complist = (PACKHEAD *)malloc(complen*sizeof(PACKHEAD));
        CHECK(complist==NULL, SYSTEM, "out of memory in ambient_list");
                                        /* compute beam weights */
        k = 0; wtotal = 0;
        for (j = 0; hdlist[j] != NULL; j++) {
                frac = 512. * VLEN(hdlist[j]->wg[0]) *
                                VLEN(hdlist[j]->wg[1]) *
                                VLEN(hdlist[j]->wg[2]);
                for (i = nbeams(hdlist[j]); i > 0; i--) {
                        complist[k].hd = j;
                        complist[k].bi = i;
                        complist[k].nr = frac*beamvolume(hdlist[j], i) + 0.5;
                        complist[k].nc = bnrays(hdlist[j], i);
                        wtotal += complist[k++].nr;
                }
        }
                                        /* adjust sample weights */
        if (vdef(DISKSPACE))
                frac = 1024.*1024.*vflt(DISKSPACE) / (wtotal*sizeof(RAYVAL));
        else
                frac = 1024.*1024.*2048. / (wtotal*sizeof(RAYVAL));
        minrt = .02*frac*wtotal/complen + .5;   /* heuristic mimimum */
        if (minrt > RPACKSIZ)
                minrt = RPACKSIZ;
        for (k = complen; k--; )
                if ((complist[k].nr = frac*complist[k].nr + 0.5) < minrt)
                        complist[k].nr = minrt;
        listpos = 0; lastin = -1;       /* flag initial sort */
}


static void
view_list(                      /* assign beam priority from view list */
        FILE    *fp
)
{
        double  pa = 1.;
        VIEW    curview;
        int     xr, yr;
        char    *err;
        BEAMLIST        blist;

        curview = stdview;
        while (nextview(&curview, fp) != EOF) {
                if ((err = setview(&curview)) != NULL) {
                        error(WARNING, err);
                        continue;
                }
                xr = yr = 1024;
                normaspect(viewaspect(&curview), &pa, &xr, &yr);
                viewbeams(&curview, xr, yr, &blist);
                bundle_set(BS_MAX, blist.bl, blist.nb);
                free((void *)blist.bl);
        }
}


extern void
init_global(void)                       /* initialize global ray computation */
{
                                        /* free old list and empty queue */
        if (complen > 0) {
                free((void *)complist);
                done_packets(flush_queue());
        }
                                        /* reseed random number generator */
        srandom(time(NULL));
                                        /* allocate beam list */
        if (readinp)
                view_list(stdin);
        else
                ambient_list();
                                        /* no view vicinity */
        myeye.rng = 0;
}


static void
mergeclists(    /* merge two sorted lists */
        register PACKHEAD       *cdest,
        register PACKHEAD       *cl1,
        int     n1,
        register PACKHEAD       *cl2,
        int     n2
)
{
        register int    cmp;

        while (n1 | n2) {
                if (!n1) cmp = 1;
                else if (!n2) cmp = -1;
                else cmp = beamcmp(cl1, cl2);
                if (cmp > 0) {
                        *cdest = *cl2;
                        cl2++; n2--;
                } else {
                        *cdest = *cl1;
                        cl1++; n1--;
                }
                cdest++;
        }
}


static void
sortcomplist(void)                      /* fix our list order */
{
        PACKHEAD        *list2;
        int     listlen;
        register int    i;

        if (complen <= 0)       /* check to see if there is even a list */
                return;
        if (!chunkycmp)         /* check to see if fragment list is full */
                if (!hdfragOK(hdlist[0]->fd, &listlen, NULL)
#if NFRAG2CHUNK
                                || listlen >= NFRAG2CHUNK
#endif
                                ) {
                        chunkycmp++;    /* use "chunky" comparison */
                        lastin = -1;    /* need to re-sort list */
#ifdef DEBUG
                        error(WARNING, "using chunky comparison mode");
#endif
                }
        if (lastin < 0 || listpos*4 >= complen*3)
                qsort((void *)complist, complen, sizeof(PACKHEAD), beamcmp);
        else if (listpos) {     /* else sort and merge sublist */
                list2 = (PACKHEAD *)malloc(listpos*sizeof(PACKHEAD));
                CHECK(list2==NULL, SYSTEM, "out of memory in sortcomplist");
                memcpy((void *)list2,(void *)complist,listpos*sizeof(PACKHEAD));
                qsort((void *)list2, listpos, sizeof(PACKHEAD), beamcmp);
                mergeclists(complist, list2, listpos,
                                complist+listpos, complen-listpos);
                free((void *)list2);
        }
                                        /* drop satisfied requests */
        for (i = complen; i-- && complist[i].nr <= complist[i].nc; )
                ;
        if (i < 0) {
                free((void *)complist);
                complist = NULL;
                complen = 0;
        } else if (i < complen-1) {
                list2 = (PACKHEAD *)realloc((void *)complist,
                                (i+1)*sizeof(PACKHEAD));
                if (list2 != NULL)
                        complist = list2;
                complen = i+1;
        }
        listpos = 0; lastin = i;
}


/*
 * The following routine works on the assumption that the bundle weights are
 * more or less evenly distributed, such that computing a packet causes
 * a given bundle to move way down in the computation order.  We keep
 * track of where the computed bundle with the highest priority would end
 * up, and if we get further in our compute list than this, we re-sort the
 * list and start again from the beginning.  Since
 * a merge sort is used, the sorting costs are minimal.
 */
extern int
next_packet(            /* prepare packet for computation */
        register PACKET *p,
        int     n
)
{
        if (listpos > lastin)           /* time to sort the list */
                sortcomplist();
        if (complen <= 0)
                return(0);
        p->hd = complist[listpos].hd;
        p->bi = complist[listpos].bi;
        p->nc = complist[listpos].nc;
        p->nr = complist[listpos].nr - p->nc;
        if (p->nr <= 0)
                return(0);
        DCHECK(n < 1 | n > RPACKSIZ,
                        CONSISTENCY, "next_packet called with bad n value");
        if (p->nr > n)
                p->nr = n;
        complist[listpos].nc += p->nr;  /* find where this one would go */
        if (hdgetbeam(hdlist[p->hd], p->bi) != NULL)
                hdfreefrag(hdlist[p->hd], p->bi);
        while (lastin > listpos && 
                        beamcmp(complist+lastin, complist+listpos) > 0)
                lastin--;
        listpos++;
        return(1);
}
Revision:	3.42
Committed:	Tue Jun 8 19:48:30 2004 UTC (20 years, 4 months ago) by greg
Content type:	text/plain
Branch:	MAIN
CVS Tags:	rad3R7P2, rad3R7P1, rad4R0, rad3R6, rad3R6P1, rad3R8, rad3R9
Changes since 3.41:	+1 -6 lines
Log Message:	Removed redundant #include's and fixed ordering on some headers
#	User	Rev	Content
1	gwlarson	3.23	#ifndef lint
2	greg	3.42	static const char RCSid[] = "$Id: rholo3.c,v 3.41 2004/01/01 11:21:55 schorsch Exp $";
3	gwlarson	3.23	#endif
4	gregl	3.1	/*
5			* Routines for tracking beam compuatations
6			*/
7
8			#include "rholo.h"
9
10	gwlarson	3.27	#ifndef NFRAG2CHUNK
11			#define NFRAG2CHUNK 4096 /* number of fragments to start chunking */
12			#endif
13
14			#ifndef abs
15	gregl	3.1	#define abs(x) ((x) > 0 ? (x) : -(x))
16	gwlarson	3.27	#endif
17			#ifndef sgn
18	gregl	3.1	#define sgn(x) ((x) > 0 ? 1 : (x) < 0 ? -1 : 0)
19	gwlarson	3.27	#endif
20	gregl	3.1
21	gwlarson	3.27	#define rchunk(n) (((n)+(RPACKSIZ/2))/RPACKSIZ)
22
23	gwlarson	3.30	int chunkycmp = 0; /* clump beams together on disk */
24
25	gregl	3.4	static PACKHEAD complist=NULL; / list of beams to compute */
26			static int complen=0; /* length of complist */
27			static int listpos=0; /* current list position for next_packet */
28			static int lastin= -1; /* last ordered position in list */
29	gregl	3.1
30	schorsch	3.41	static void sortcomplist(void);
31			static void mergeclists(PACKHEAD cdest, PACKHEAD cl1, int n1, PACKHEAD *cl2, int n2);
32			static void view_list(FILE *fp);
33			static void ambient_list(void);
34			static double beamvolume(HOLO *hp, int bi);
35			static void dispbeam(BEAM b, HDBEAMI hb);
36
37	gregl	3.1
38	schorsch	3.41
39			static int
40	gwlarson	3.23	beamcmp(b0, b1) /* comparison for compute order */
41	gregl	3.2	register PACKHEAD b0, b1;
42			{
43	gwlarson	3.27	BEAMI bip0, bip1;
44			register long c;
45			/* first check desired quantities */
46	gwlarson	3.30	if (chunkycmp)
47	gwlarson	3.28	c = rchunk(b1->nr)*(rchunk(b0->nc)+1L) -
48			rchunk(b0->nr)*(rchunk(b1->nc)+1L);
49	gwlarson	3.27	else
50	gwlarson	3.28	c = b1->nr(b0->nc+1L) - b0->nr(b1->nc+1L);
51			if (c > 0) return(1);
52			if (c < 0) return(-1);
53	gwlarson	3.27	/* only one file, so skip the following: */
54			#if 0
55			/* next, check file descriptors */
56			c = hdlist[b0->hd]->fd - hdlist[b1->hd]->fd;
57			if (c) return(c);
58			#endif
59			/* finally, check file positions */
60			bip0 = &hdlist[b0->hd]->bi[b0->bi];
61			bip1 = &hdlist[b1->hd]->bi[b1->bi];
62			/* put diskless beams last */
63			if (!bip0->nrd)
64			return(bip1->nrd > 0);
65			if (!bip1->nrd)
66			return(-1);
67			c = bip0->fo - bip1->fo;
68			return(c < 0 ? -1 : c > 0);
69	gregl	3.2	}
70
71
72	gregl	3.14	int
73	gwlarson	3.23	beamidcmp(b0, b1) /* comparison for beam searching */
74			register PACKHEAD b0, b1;
75			{
76			register int c = b0->hd - b1->hd;
77
78			if (c) return(c);
79			return(b0->bi - b1->bi);
80			}
81
82
83	schorsch	3.41	static void
84			dispbeam( /* display a holodeck beam */
85			register BEAM *b,
86			register HDBEAMI *hb
87			)
88	gregl	3.14	{
89			static int n = 0;
90			static PACKHEAD *p = NULL;
91
92			if (b == NULL)
93			return;
94			if (b->nrm > n) { /* (re)allocate packet holder */
95			n = b->nrm;
96			if (p == NULL) p = (PACKHEAD *)malloc(packsiz(n));
97	greg	3.35	else p = (PACKHEAD )realloc((void )p, packsiz(n));
98	gwlarson	3.31	CHECK(p==NULL, SYSTEM, "out of memory in dispbeam");
99	gregl	3.14	}
100			/* assign packet fields */
101	schorsch	3.38	memcpy((void )packra(p), (void )hdbray(b), b->nrm*sizeof(RAYVAL));
102	gregl	3.14	p->nr = p->nc = b->nrm;
103	gwlarson	3.23	for (p->hd = 0; hdlist[p->hd] != hb->h; p->hd++)
104	gregl	3.14	if (hdlist[p->hd] == NULL)
105			error(CONSISTENCY, "unregistered holodeck in dispbeam");
106	gwlarson	3.23	p->bi = hb->b;
107	gregl	3.14	disp_packet(p); /* display it */
108	gwlarson	3.29	if (n >= 1024) { /* free ridiculous packets */
109	greg	3.34	free((void *)p);
110	gwlarson	3.29	p = NULL; n = 0;
111			}
112	gregl	3.14	}
113
114
115	schorsch	3.41	extern void
116			bundle_set( /* bundle set operation */
117			int op,
118			PACKHEAD *clist,
119			int nents
120			)
121	gregl	3.2	{
122	gwlarson	3.23	int oldnr, n;
123			HDBEAMI *hbarr;
124			register PACKHEAD *csm;
125			register int i;
126			/* search for common members */
127			for (csm = clist+nents; csm-- > clist; )
128			csm->nc = -1;
129	greg	3.36	qsort((void *)clist, nents, sizeof(PACKHEAD), beamidcmp);
130	gwlarson	3.23	for (i = 0; i < complen; i++) {
131	greg	3.36	csm = (PACKHEAD )bsearch((void )(complist+i), (void *)clist,
132	gwlarson	3.23	nents, sizeof(PACKHEAD), beamidcmp);
133			if (csm == NULL)
134			continue;
135			oldnr = complist[i].nr;
136			csm->nc = complist[i].nc;
137			switch (op) {
138			case BS_ADD: /* add to count */
139			complist[i].nr += csm->nr;
140			csm->nr = 0;
141			break;
142	gwlarson	3.31	case BS_MAX: /* maximum of counts */
143			if (csm->nr > complist[i].nr)
144			complist[i].nr = csm->nr;
145			csm->nr = 0;
146			break;
147	gwlarson	3.23	case BS_ADJ: /* reset count */
148			complist[i].nr = csm->nr;
149			csm->nr = 0;
150			break;
151			case BS_DEL: /* delete count */
152			if (csm->nr == 0 \|\| csm->nr >= complist[i].nr)
153			complist[i].nr = 0;
154			else
155			complist[i].nr -= csm->nr;
156			break;
157			}
158			if (complist[i].nr != oldnr)
159			lastin = -1; /* flag sort */
160	gregl	3.20	}
161	gwlarson	3.24	/* record computed rays for uncommon beams */
162	gwlarson	3.23	for (csm = clist+nents; csm-- > clist; )
163			if (csm->nc < 0)
164			csm->nc = bnrays(hdlist[csm->hd], csm->bi);
165	gregl	3.20	/* complete list operations */
166	gregl	3.2	switch (op) {
167			case BS_NEW: /* new computation set */
168	gwlarson	3.21	listpos = 0; lastin = -1;
169	gregl	3.20	if (complen) /* free old list */
170	greg	3.34	free((void *)complist);
171	gregl	3.20	complist = NULL;
172			if (!(complen = nents))
173	gregl	3.2	return;
174			complist = (PACKHEAD )malloc(nentssizeof(PACKHEAD));
175			if (complist == NULL)
176			goto memerr;
177	schorsch	3.38	memcpy((void )complist, (void )clist, nents*sizeof(PACKHEAD));
178	gregl	3.2	break;
179			case BS_ADD: /* add to computation set */
180	gwlarson	3.31	case BS_MAX: /* maximum of quantities */
181	gregl	3.11	case BS_ADJ: /* adjust set quantities */
182	gregl	3.2	if (nents <= 0)
183			return;
184	gregl	3.20	sortcomplist(); /* sort updated list & new entries */
185	greg	3.36	qsort((void *)clist, nents, sizeof(PACKHEAD), beamcmp);
186	gregl	3.2	/* what can't we satisfy? */
187	gwlarson	3.23	for (i = nents, csm = clist; i-- && csm->nr > csm->nc; csm++)
188	gregl	3.2	;
189	gwlarson	3.23	n = csm - clist;
190	gwlarson	3.31	if (op != BS_ADD) { /* don't regenerate adjusted beams */
191	gwlarson	3.24	for (++i; i-- && csm->nr > 0; csm++)
192	gwlarson	3.22	;
193	gwlarson	3.24	nents = csm - clist;
194	gwlarson	3.22	}
195	gregl	3.2	if (n) { /* allocate space for merged list */
196			PACKHEAD *newlist;
197			newlist = (PACKHEAD *)malloc(
198			(complen+n)*sizeof(PACKHEAD) );
199			if (newlist == NULL)
200			goto memerr;
201			/* merge lists */
202			mergeclists(newlist, clist, n, complist, complen);
203			if (complen)
204	greg	3.34	free((void *)complist);
205	gregl	3.2	complist = newlist;
206			complen += n;
207			}
208			listpos = 0;
209			lastin = complen-1; /* list is now sorted */
210			break;
211			case BS_DEL: /* delete from computation set */
212	gregl	3.20	return; /* already done */
213	gregl	3.2	default:
214			error(CONSISTENCY, "bundle_set called with unknown operation");
215			}
216	gwlarson	3.27	if (outdev == NULL \|\| !nents) /* nothing to display? */
217	gwlarson	3.22	return;
218			/* load and display beams we have */
219	gwlarson	3.23	hbarr = (HDBEAMI )malloc(nentssizeof(HDBEAMI));
220			for (i = nents; i--; ) {
221			hbarr[i].h = hdlist[clist[i].hd];
222			hbarr[i].b = clist[i].bi;
223	gregl	3.11	}
224	gwlarson	3.23	hdloadbeams(hbarr, nents, dispbeam);
225	greg	3.34	free((void *)hbarr);
226	gwlarson	3.27	if (hdfragflags&FF_READ) {
227			listpos = 0;
228			lastin = -1; /* need to re-sort list */
229			}
230	gregl	3.2	return;
231			memerr:
232			error(SYSTEM, "out of memory in bundle_set");
233			}
234
235
236	schorsch	3.41	static double
237			beamvolume( /* compute approximate volume of a beam */
238			HOLO *hp,
239			int bi
240			)
241	gregl	3.1	{
242	gregl	3.13	GCOORD gc[2];
243			FVECT cp[4], edgeA, edgeB, cent[2];
244	schorsch	3.41	FVECT crossp[2], diffv;
245	gregl	3.13	double vol[2];
246			register int i;
247			/* get grid coordinates */
248			if (!hdbcoord(gc, hp, bi))
249			error(CONSISTENCY, "bad beam index in beamvolume");
250			for (i = 0; i < 2; i++) { /* compute cell area vectors */
251			hdcell(cp, hp, gc+i);
252			VSUM(edgeA, cp[1], cp[0], -1.0);
253			VSUM(edgeB, cp[3], cp[1], -1.0);
254			fcross(crossp[i], edgeA, edgeB);
255			/* compute center */
256			cent[i][0] = 0.5*(cp[0][0] + cp[2][0]);
257			cent[i][1] = 0.5*(cp[0][1] + cp[2][1]);
258			cent[i][2] = 0.5*(cp[0][2] + cp[2][2]);
259	gregl	3.1	}
260	gregl	3.13	/* compute difference vector */
261			VSUM(diffv, cent[1], cent[0], -1.0);
262			for (i = 0; i < 2; i++) { /* compute volume contributions */
263	gregl	3.15	vol[i] = 0.5*DOT(crossp[i], diffv);
264	gregl	3.13	if (vol[i] < 0.) vol[i] = -vol[i];
265			}
266			return(vol[0] + vol[1]); /* return total volume */
267	gregl	3.1	}
268
269
270	schorsch	3.41	static void
271			ambient_list(void) /* compute ambient beam list */
272	gregl	3.1	{
273	greg	3.37	int32 wtotal, minrt;
274	gregl	3.1	double frac;
275	gregl	3.13	int i;
276			register int j, k;
277	gwlarson	3.31
278	gregl	3.1	complen = 0;
279			for (j = 0; hdlist[j] != NULL; j++)
280			complen += nbeams(hdlist[j]);
281			complist = (PACKHEAD )malloc(complensizeof(PACKHEAD));
282	gwlarson	3.31	CHECK(complist==NULL, SYSTEM, "out of memory in ambient_list");
283	gregl	3.1	/* compute beam weights */
284	gwlarson	3.32	k = 0; wtotal = 0;
285	gregl	3.13	for (j = 0; hdlist[j] != NULL; j++) {
286	gregl	3.19	frac = 512. * VLEN(hdlist[j]->wg[0]) *
287			VLEN(hdlist[j]->wg[1]) *
288			VLEN(hdlist[j]->wg[2]);
289	gregl	3.1	for (i = nbeams(hdlist[j]); i > 0; i--) {
290			complist[k].hd = j;
291			complist[k].bi = i;
292	gregl	3.13	complist[k].nr = frac*beamvolume(hdlist[j], i) + 0.5;
293	gregl	3.18	complist[k].nc = bnrays(hdlist[j], i);
294	gregl	3.1	wtotal += complist[k++].nr;
295			}
296	gregl	3.13	}
297	gwlarson	3.31	/* adjust sample weights */
298	gregl	3.12	if (vdef(DISKSPACE))
299	gwlarson	3.32	frac = 1024.1024.vflt(DISKSPACE) / (wtotal*sizeof(RAYVAL));
300	gregl	3.12	else
301	gwlarson	3.32	frac = 1024.1024.2048. / (wtotal*sizeof(RAYVAL));
302			minrt = .02fracwtotal/complen + .5; /* heuristic mimimum */
303			if (minrt > RPACKSIZ)
304			minrt = RPACKSIZ;
305			for (k = complen; k--; )
306			if ((complist[k].nr = frac*complist[k].nr + 0.5) < minrt)
307			complist[k].nr = minrt;
308	gwlarson	3.31	listpos = 0; lastin = -1; /* flag initial sort */
309			}
310
311
312	schorsch	3.41	static void
313			view_list( /* assign beam priority from view list */
314			FILE *fp
315			)
316	gwlarson	3.31	{
317			double pa = 1.;
318			VIEW curview;
319			int xr, yr;
320			char *err;
321			BEAMLIST blist;
322
323	schorsch	3.40	curview = stdview;
324	gwlarson	3.31	while (nextview(&curview, fp) != EOF) {
325			if ((err = setview(&curview)) != NULL) {
326			error(WARNING, err);
327			continue;
328			}
329			xr = yr = 1024;
330			normaspect(viewaspect(&curview), &pa, &xr, &yr);
331			viewbeams(&curview, xr, yr, &blist);
332			bundle_set(BS_MAX, blist.bl, blist.nb);
333	greg	3.34	free((void *)blist.bl);
334	gwlarson	3.31	}
335			}
336
337
338	schorsch	3.41	extern void
339			init_global(void) /* initialize global ray computation */
340	gwlarson	3.31	{
341			/* free old list and empty queue */
342			if (complen > 0) {
343	greg	3.34	free((void *)complist);
344	gwlarson	3.31	done_packets(flush_queue());
345			}
346			/* reseed random number generator */
347			srandom(time(NULL));
348			/* allocate beam list */
349			if (readinp)
350			view_list(stdin);
351			else
352			ambient_list();
353	gwlarson	3.25	/* no view vicinity */
354			myeye.rng = 0;
355	gregl	3.1	}
356
357
358	schorsch	3.41	static void
359			mergeclists( /* merge two sorted lists */
360			register PACKHEAD *cdest,
361			register PACKHEAD *cl1,
362			int n1,
363			register PACKHEAD *cl2,
364			int n2
365			)
366	gregl	3.1	{
367	gregl	3.16	register int cmp;
368	gregl	3.1
369			while (n1 \| n2) {
370			if (!n1) cmp = 1;
371			else if (!n2) cmp = -1;
372			else cmp = beamcmp(cl1, cl2);
373			if (cmp > 0) {
374	schorsch	3.40	cdest = cl2;
375	gregl	3.1	cl2++; n2--;
376			} else {
377	schorsch	3.40	cdest = cl1;
378	gregl	3.1	cl1++; n1--;
379			}
380			cdest++;
381			}
382			}
383
384
385	schorsch	3.41	static void
386			sortcomplist(void) /* fix our list order */
387	gregl	3.1	{
388			PACKHEAD *list2;
389	gwlarson	3.27	int listlen;
390	gregl	3.2	register int i;
391
392	gregl	3.3	if (complen <= 0) /* check to see if there is even a list */
393	gregl	3.2	return;
394	gwlarson	3.30	if (!chunkycmp) /* check to see if fragment list is full */
395	gwlarson	3.27	if (!hdfragOK(hdlist[0]->fd, &listlen, NULL)
396			#if NFRAG2CHUNK
397			\|\| listlen >= NFRAG2CHUNK
398			#endif
399			) {
400	gwlarson	3.30	chunkycmp++; /* use "chunky" comparison */
401			lastin = -1; /* need to re-sort list */
402	gwlarson	3.27	#ifdef DEBUG
403			error(WARNING, "using chunky comparison mode");
404			#endif
405			}
406	gregl	3.6	if (lastin < 0 \|\| listpos4 >= complen3)
407	greg	3.36	qsort((void *)complist, complen, sizeof(PACKHEAD), beamcmp);
408	gregl	3.1	else if (listpos) { /* else sort and merge sublist */
409			list2 = (PACKHEAD )malloc(listpossizeof(PACKHEAD));
410	gwlarson	3.31	CHECK(list2==NULL, SYSTEM, "out of memory in sortcomplist");
411	schorsch	3.38	memcpy((void )list2,(void )complist,listpos*sizeof(PACKHEAD));
412	greg	3.36	qsort((void *)list2, listpos, sizeof(PACKHEAD), beamcmp);
413	gregl	3.1	mergeclists(complist, list2, listpos,
414			complist+listpos, complen-listpos);
415	greg	3.34	free((void *)list2);
416	gregl	3.1	}
417	gregl	3.2	/* drop satisfied requests */
418	gregl	3.11	for (i = complen; i-- && complist[i].nr <= complist[i].nc; )
419	gregl	3.2	;
420	gregl	3.4	if (i < 0) {
421	greg	3.34	free((void *)complist);
422	gregl	3.4	complist = NULL;
423			complen = 0;
424			} else if (i < complen-1) {
425	greg	3.35	list2 = (PACKHEAD )realloc((void )complist,
426	gregl	3.2	(i+1)*sizeof(PACKHEAD));
427	gwlarson	3.26	if (list2 != NULL)
428	gregl	3.2	complist = list2;
429	gwlarson	3.26	complen = i+1;
430	gregl	3.2	}
431			listpos = 0; lastin = i;
432	gregl	3.1	}
433
434
435			/*
436			* The following routine works on the assumption that the bundle weights are
437			* more or less evenly distributed, such that computing a packet causes
438			* a given bundle to move way down in the computation order. We keep
439			* track of where the computed bundle with the highest priority would end
440	gwlarson	3.27	* up, and if we get further in our compute list than this, we re-sort the
441	gregl	3.11	* list and start again from the beginning. Since
442			* a merge sort is used, the sorting costs are minimal.
443	gregl	3.1	*/
444	schorsch	3.41	extern int
445			next_packet( /* prepare packet for computation */
446			register PACKET *p,
447			int n
448			)
449	gregl	3.1	{
450	gregl	3.10	if (listpos > lastin) /* time to sort the list */
451			sortcomplist();
452	gregl	3.1	if (complen <= 0)
453			return(0);
454			p->hd = complist[listpos].hd;
455			p->bi = complist[listpos].bi;
456	gregl	3.11	p->nc = complist[listpos].nc;
457			p->nr = complist[listpos].nr - p->nc;
458	gregl	3.1	if (p->nr <= 0)
459			return(0);
460	gwlarson	3.28	DCHECK(n < 1 \| n > RPACKSIZ,
461			CONSISTENCY, "next_packet called with bad n value");
462	gregl	3.17	if (p->nr > n)
463			p->nr = n;
464	gregl	3.11	complist[listpos].nc += p->nr; /* find where this one would go */
465	gwlarson	3.27	if (hdgetbeam(hdlist[p->hd], p->bi) != NULL)
466			hdfreefrag(hdlist[p->hd], p->bi);
467	gregl	3.11	while (lastin > listpos &&
468			beamcmp(complist+lastin, complist+listpos) > 0)
469	gregl	3.1	lastin--;
470			listpos++;
471			return(1);
472			}