--- ray/src/hd/rholo3.c	1997/12/01 16:35:02	3.12
+++ ray/src/hd/rholo3.c	1999/01/09 09:17:10	3.28
@@ -1,4 +1,4 @@
-/* Copyright (c) 1997 Silicon Graphics, Inc. */
+/* Copyright (c) 1998 Silicon Graphics, Inc. */
 
 #ifndef lint
 static char SCCSid[] = "$SunId$ SGI";
@@ -9,82 +9,174 @@ static char SCCSid[] = "$SunId$ SGI";
  */
 
 #include "rholo.h"
+#include <sys/types.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)
+
+extern time_t	time();
+
 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 int	chunky=0;	/* clump beams together on disk */
 
 
 int
-beamcmp(b0, b1)			/* comparison for descending compute order */
+beamcmp(b0, b1)				/* comparison for compute order */
 register PACKHEAD	*b0, *b1;
 {
-	return(	b1->nr*(b0->nc+1) - b0->nr*(b1->nc+1) );
+	BEAMI	*bip0, *bip1;
+	register long	c;
+					/* first check desired quantities */
+	if (chunky)
+		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);
+}
+
+
+int
+dispbeam(b, hb)				/* 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((char *)p, packsiz(n));
+		if (p == NULL)
+			error(SYSTEM, "out of memory in dispbeam");
+	}
+					/* assign packet fields */
+	bcopy((char *)hdbray(b), (char *)packra(p), 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 */
+}
+
+
 bundle_set(op, clist, nents)	/* bundle set operation */
 int	op;
 PACKHEAD	*clist;
 int	nents;
 {
-	BEAM	*b;
-	PACKHEAD	*p;
-	register int	i, n;
-
+	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((char *)clist, nents, sizeof(PACKHEAD), beamidcmp);
+	for (i = 0; i < complen; i++) {
+		csm = (PACKHEAD *)bsearch((char *)(complist+i), (char *)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_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 */
-		if (complen)
+		listpos = 0; lastin = -1;
+		if (complen)		/* free old list */
 			free((char *)complist);
-		if (nents <= 0) {
-			complist = NULL;
-			listpos = complen = 0;
-			lastin = -1;
+		complist = NULL;
+		if (!(complen = nents))
 			return;
-		}
 		complist = (PACKHEAD *)malloc(nents*sizeof(PACKHEAD));
 		if (complist == NULL)
 			goto memerr;
 		bcopy((char *)clist, (char *)complist, nents*sizeof(PACKHEAD));
-		complen = nents;	/* finish initialization below */
 		break;
 	case BS_ADD:			/* add to computation set */
 	case BS_ADJ:			/* adjust set quantities */
 		if (nents <= 0)
 			return;
-					/* merge any common members */
-		for (n = 0; n < nents; n++) {
-			for (i = 0; i < complen; i++)
-				if (clist[n].bi == complist[i].bi &&
-						clist[n].hd == complist[i].hd) {
-					int	oldnr = complist[i].nr;
-					if (op == BS_ADD)
-						complist[i].nr += clist[n].nr;
-					else /* op == BS_ADJ */
-						complist[i].nr = clist[n].nr;
-					clist[n].nr = 0;
-					clist[n].nc = complist[i].nc;
-					if (complist[i].nr != oldnr)
-						lastin = -1;	/* flag sort */
-					break;
-				}
-			if (i >= complen)
-				clist[n].nc = bnrays(hdlist[clist[n].hd],
-						clist[n].bi);
-		}
-					/* sort updated list */
-		sortcomplist();
-					/* sort new entries */
+		sortcomplist();		/* sort updated list & new entries */
 		qsort((char *)clist, nents, sizeof(PACKHEAD), beamcmp);
 					/* what can't we satisfy? */
-		for (n = 0; n < nents && clist[n].nr > clist[n].nc; n++)
+		for (i = nents, csm = clist; i-- && csm->nr > csm->nc; csm++)
 			;
-		if (op == BS_ADJ)
-			nents = n;
+		n = csm - clist;
+		if (op == BS_ADJ) {	/* 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(
@@ -102,55 +194,23 @@ int	nents;
 		lastin = complen-1;	/* list is now sorted */
 		break;
 	case BS_DEL:			/* delete from computation set */
-		if (nents <= 0)
-			return;
-					/* find each member */
-		for (i = 0; i < complen; i++)
-			for (n = 0; n < nents; n++)
-				if (clist[n].bi == complist[i].bi &&
-						clist[n].hd == complist[i].hd) {
-					if (clist[n].nr == 0 ||
-						clist[n].nr >= complist[i].nr)
-						complist[i].nr = 0;
-					else
-						complist[i].nr -= clist[n].nr;
-					lastin = -1;	/* flag full sort */
-					break;
-				}
-		return;			/* no display */
+		return;			/* already done */
 	default:
 		error(CONSISTENCY, "bundle_set called with unknown operation");
 	}
-	if (outdev == NULL)
+	if (outdev == NULL || !nents)	/* nothing to display? */
 		return;
-	n = 32*RPACKSIZ;		/* allocate packet holder */
-	p = (PACKHEAD *)malloc(packsiz(n));
-	if (p == NULL)
-		goto memerr;
-					/* display what we have */
-	for (i = 0; i < nents; i++)
-		if ((b = hdgetbeam(hdlist[clist[i].hd], clist[i].bi)) != NULL) {
-			if (b->nrm > n) {
-				n = b->nrm;
-				p = (PACKHEAD *)realloc((char *)p, packsiz(n));
-				if (p == NULL)
-					goto memerr;
-			}
-			bcopy((char *)hdbray(b), (char *)packra(p),
-					b->nrm*sizeof(RAYVAL));
-			p->hd = clist[i].hd;
-			p->bi = clist[i].bi;
-			p->nr = p->nc = b->nrm;
-			disp_packet(p);
-		}
-	free((char *)p);		/* clean up */
-	if (op == BS_NEW) {
-		done_packets(flush_queue());	/* empty queue, so we can... */
-		for (i = 0; i < complen; i++)	/* ...get number computed */
-			complist[i].nc = bnrays(hdlist[complist[i].hd],
-						complist[i].bi);
+					/* 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((char *)hbarr);
+	if (hdfragflags&FF_READ) {
 		listpos = 0;
-		lastin = -1;		/* flag for initial sort */
+		lastin = -1;		/* need to re-sort list */
 	}
 	return;
 memerr:
@@ -158,77 +218,52 @@ memerr:
 }
 
 
-int
-weightf(hp, x0, x1, x2)		/* voxel weighting function */
-register HOLO	*hp;
-register int	x0, x1, x2;
-{
-	switch (vlet(OCCUPANCY)) {
-	case 'U':		/* uniform weighting */
-		return(1);
-	case 'C':		/* center weighting (crude) */
-		x0 += x0 - hp->grid[0] + 1;
-		x0 = abs(x0)*hp->grid[1]*hp->grid[2];
-		x1 += x1 - hp->grid[1] + 1;
-		x1 = abs(x1)*hp->grid[0]*hp->grid[2];
-		x2 += x2 - hp->grid[2] + 1;
-		x2 = abs(x2)*hp->grid[0]*hp->grid[1];
-		return(hp->grid[0]*hp->grid[1]*hp->grid[2] -
-				(x0+x1+x2)/3);
-	default:
-		badvalue(OCCUPANCY);
-	}
-}
-
-
-/* The following is by Daniel Cohen, taken from Graphics Gems IV, p. 368 */
-long
-lineweight(hp, x, y, z, dx, dy, dz)	/* compute weights along a line */
+double
+beamvolume(hp, bi)	/* compute approximate volume of a beam */
 HOLO	*hp;
-int	x, y, z, dx, dy, dz;
+int	bi;
 {
-	long	wres = 0;
-	int	n, sx, sy, sz, exy, exz, ezy, ax, ay, az, bx, by, bz;
-
-	sx = sgn(dx);	sy = sgn(dy);	sz = sgn(dz);
-	ax = abs(dx);	ay = abs(dy);	az = abs(dz);
-	bx = 2*ax;	by = 2*ay;	bz = 2*az;
-	exy = ay-ax;	exz = az-ax;	ezy = ay-az;
-	n = ax+ay+az + 1;		/* added increment to visit last */
-	while (n--) {
-		wres += weightf(hp, x, y, z);
-		if (exy < 0) {
-			if (exz < 0) {
-				x += sx;
-				exy += by; exz += bz;
-			} else {
-				z += sz;
-				exz -= bx; ezy += by;
-			}
-		} else {
-			if (ezy < 0) {
-				z += sz;
-				exz -= bx; ezy += by;
-			} else {
-				y += sy;
-				exy -= bx; ezy -= bz;
-			}
-		}
+	GCOORD	gc[2];
+	FVECT	cp[4], edgeA, edgeB, cent[2];
+	FVECT	v, 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]);
 	}
-	return(wres);
+					/* 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 */
 }
 
 
 init_global()			/* initialize global ray computation */
 {
 	long	wtotal = 0;
-	int	i, j;
-	int	lseg[2][3];
 	double	frac;
-	register int	k;
-					/* free old list */
-	if (complen > 0)
+	int	i;
+	register int	j, k;
+					/* free old list and empty queue */
+	if (complen > 0) {
 		free((char *)complist);
+		done_packets(flush_queue());
+	}
+					/* reseed random number generator */
+	srandom(time(NULL));
 					/* allocate beam list */
 	complen = 0;
 	for (j = 0; hdlist[j] != NULL; j++)
@@ -238,35 +273,38 @@ init_global()			/* initialize global ray computation *
 		error(SYSTEM, "out of memory in init_global");
 					/* compute beam weights */
 	k = 0;
-	for (j = 0; hdlist[j] != NULL; j++)
+	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--) {
-			hdlseg(lseg, hdlist[j], i);
 			complist[k].hd = j;
 			complist[k].bi = i;
-			complist[k].nr = lineweight( hdlist[j],
-					lseg[0][0], lseg[0][1], lseg[0][2],
-					lseg[1][0] - lseg[0][0],
-					lseg[1][1] - lseg[0][1],
-					lseg[1][2] - lseg[0][2] );
+			complist[k].nr = frac*beamvolume(hdlist[j], i) + 0.5;
+			complist[k].nc = bnrays(hdlist[j], i);
 			wtotal += complist[k++].nr;
 		}
+	}
 					/* adjust weights */
 	if (vdef(DISKSPACE))
 		frac = 1024.*1024.*vflt(DISKSPACE) / (wtotal*sizeof(RAYVAL));
 	else
 		frac = 1024.*1024.*16384. / (wtotal*sizeof(RAYVAL));
 	while (k--)
-		complist[k].nr = frac * complist[k].nr;
-	listpos = 0; lastin = -1;	/* flag initial sort */
+		complist[k].nr = frac*complist[k].nr + 0.5;
+	listpos = 0; lastin = -1;	/* perform initial sort */
+	sortcomplist();
+					/* no view vicinity */
+	myeye.rng = 0;
 }
 
 
 mergeclists(cdest, cl1, n1, cl2, n2)	/* merge two sorted lists */
-PACKHEAD	*cdest;
-PACKHEAD	*cl1, *cl2;
+register PACKHEAD	*cdest;
+register PACKHEAD	*cl1, *cl2;
 int	n1, n2;
 {
-	int	cmp;
+	register int	cmp;
 
 	while (n1 | n2) {
 		if (!n1) cmp = 1;
@@ -287,10 +325,28 @@ int	n1, n2;
 sortcomplist()			/* 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 (!chunky)		/* check to see if fragment list is full */
+		if (!hdfragOK(hdlist[0]->fd, &listlen, NULL)
+#if NFRAG2CHUNK
+				|| listlen >= NFRAG2CHUNK
+#endif
+				) {
+#ifdef DEBUG
+			error(WARNING, "using chunky comparison mode");
+#endif
+			chunky++;	/* use "chunky" comparison */
+			lastin = -1;	/* need to re-sort list */
+		}
+#ifdef DEBUG
+			else
+				fprintf(stderr, "sortcomplist: %d fragments\n",
+						listlen);
+#endif
 	if (lastin < 0 || listpos*4 >= complen*3)
 		qsort((char *)complist, complen, sizeof(PACKHEAD), beamcmp);
 	else if (listpos) {	/* else sort and merge sublist */
@@ -313,10 +369,9 @@ sortcomplist()			/* fix our list order */
 	} else if (i < complen-1) {
 		list2 = (PACKHEAD *)realloc((char *)complist,
 				(i+1)*sizeof(PACKHEAD));
-		if (list2 != NULL) {
+		if (list2 != NULL)
 			complist = list2;
-			complen = i+1;
-		}
+		complen = i+1;
 	}
 	listpos = 0; lastin = i;
 }
@@ -327,12 +382,13 @@ sortcomplist()			/* fix our list order */
  * 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 resort the
+ * 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.
  */
-next_packet(p)			/* prepare packet for computation */
+next_packet(p, n)		/* prepare packet for computation */
 register PACKET	*p;
+int	n;
 {
 	register int	i;
 
@@ -346,9 +402,13 @@ register PACKET	*p;
 	p->nr = complist[listpos].nr - p->nc;
 	if (p->nr <= 0)
 		return(0);
-	if (p->nr > RPACKSIZ)
-		p->nr = RPACKSIZ;
+	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--;