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root/radiance/ray/src/hd/rholo3.c
Revision: 3.13
Committed: Mon Dec 15 20:44:28 1997 UTC (26 years, 3 months ago) by gregl
Content type: text/plain
Branch: MAIN
Changes since 3.12: +38 -65 lines
Log Message:
eliminated OCCUPANCY variable and improved beam volume calculation

File Contents

# User Rev Content
1 gregl 3.1 /* Copyright (c) 1997 Silicon Graphics, Inc. */
2    
3     #ifndef lint
4     static char SCCSid[] = "$SunId$ SGI";
5     #endif
6    
7     /*
8     * Routines for tracking beam compuatations
9     */
10    
11     #include "rholo.h"
12    
13     #define abs(x) ((x) > 0 ? (x) : -(x))
14     #define sgn(x) ((x) > 0 ? 1 : (x) < 0 ? -1 : 0)
15    
16 gregl 3.4 static PACKHEAD *complist=NULL; /* list of beams to compute */
17     static int complen=0; /* length of complist */
18     static int listpos=0; /* current list position for next_packet */
19     static int lastin= -1; /* last ordered position in list */
20 gregl 3.1
21    
22     int
23 gregl 3.2 beamcmp(b0, b1) /* comparison for descending compute order */
24     register PACKHEAD *b0, *b1;
25     {
26 gregl 3.11 return( b1->nr*(b0->nc+1) - b0->nr*(b1->nc+1) );
27 gregl 3.2 }
28    
29    
30     bundle_set(op, clist, nents) /* bundle set operation */
31     int op;
32     PACKHEAD *clist;
33     int nents;
34     {
35     BEAM *b;
36     PACKHEAD *p;
37     register int i, n;
38    
39     switch (op) {
40     case BS_NEW: /* new computation set */
41     if (complen)
42     free((char *)complist);
43     if (nents <= 0) {
44     complist = NULL;
45     listpos = complen = 0;
46     lastin = -1;
47     return;
48     }
49     complist = (PACKHEAD *)malloc(nents*sizeof(PACKHEAD));
50     if (complist == NULL)
51     goto memerr;
52     bcopy((char *)clist, (char *)complist, nents*sizeof(PACKHEAD));
53 gregl 3.12 complen = nents; /* finish initialization below */
54 gregl 3.2 break;
55     case BS_ADD: /* add to computation set */
56 gregl 3.11 case BS_ADJ: /* adjust set quantities */
57 gregl 3.2 if (nents <= 0)
58     return;
59     /* merge any common members */
60 gregl 3.12 for (n = 0; n < nents; n++) {
61     for (i = 0; i < complen; i++)
62 gregl 3.2 if (clist[n].bi == complist[i].bi &&
63     clist[n].hd == complist[i].hd) {
64 gregl 3.12 int oldnr = complist[i].nr;
65 gregl 3.11 if (op == BS_ADD)
66     complist[i].nr += clist[n].nr;
67     else /* op == BS_ADJ */
68     complist[i].nr = clist[n].nr;
69 gregl 3.2 clist[n].nr = 0;
70 gregl 3.12 clist[n].nc = complist[i].nc;
71     if (complist[i].nr != oldnr)
72     lastin = -1; /* flag sort */
73 gregl 3.2 break;
74     }
75 gregl 3.12 if (i >= complen)
76     clist[n].nc = bnrays(hdlist[clist[n].hd],
77     clist[n].bi);
78 gregl 3.11 }
79 gregl 3.2 /* sort updated list */
80     sortcomplist();
81     /* sort new entries */
82     qsort((char *)clist, nents, sizeof(PACKHEAD), beamcmp);
83     /* what can't we satisfy? */
84 gregl 3.11 for (n = 0; n < nents && clist[n].nr > clist[n].nc; n++)
85 gregl 3.2 ;
86 gregl 3.11 if (op == BS_ADJ)
87     nents = n;
88 gregl 3.2 if (n) { /* allocate space for merged list */
89     PACKHEAD *newlist;
90     newlist = (PACKHEAD *)malloc(
91     (complen+n)*sizeof(PACKHEAD) );
92     if (newlist == NULL)
93     goto memerr;
94     /* merge lists */
95     mergeclists(newlist, clist, n, complist, complen);
96     if (complen)
97     free((char *)complist);
98     complist = newlist;
99     complen += n;
100     }
101     listpos = 0;
102     lastin = complen-1; /* list is now sorted */
103     break;
104     case BS_DEL: /* delete from computation set */
105     if (nents <= 0)
106     return;
107     /* find each member */
108     for (i = 0; i < complen; i++)
109     for (n = 0; n < nents; n++)
110     if (clist[n].bi == complist[i].bi &&
111     clist[n].hd == complist[i].hd) {
112     if (clist[n].nr == 0 ||
113     clist[n].nr >= complist[i].nr)
114     complist[i].nr = 0;
115     else
116     complist[i].nr -= clist[n].nr;
117     lastin = -1; /* flag full sort */
118     break;
119     }
120     return; /* no display */
121     default:
122     error(CONSISTENCY, "bundle_set called with unknown operation");
123     }
124 gregl 3.8 if (outdev == NULL)
125     return;
126 gregl 3.11 n = 32*RPACKSIZ; /* allocate packet holder */
127 gregl 3.5 p = (PACKHEAD *)malloc(packsiz(n));
128 gregl 3.3 if (p == NULL)
129     goto memerr;
130     /* display what we have */
131 gregl 3.2 for (i = 0; i < nents; i++)
132 gregl 3.3 if ((b = hdgetbeam(hdlist[clist[i].hd], clist[i].bi)) != NULL) {
133 gregl 3.7 if (b->nrm > n) {
134     n = b->nrm;
135     p = (PACKHEAD *)realloc((char *)p, packsiz(n));
136     if (p == NULL)
137     goto memerr;
138     }
139 gregl 3.6 bcopy((char *)hdbray(b), (char *)packra(p),
140 gregl 3.11 b->nrm*sizeof(RAYVAL));
141 gregl 3.7 p->hd = clist[i].hd;
142     p->bi = clist[i].bi;
143 gregl 3.11 p->nr = p->nc = b->nrm;
144 gregl 3.5 disp_packet(p);
145 gregl 3.2 }
146     free((char *)p); /* clean up */
147 gregl 3.11 if (op == BS_NEW) {
148     done_packets(flush_queue()); /* empty queue, so we can... */
149     for (i = 0; i < complen; i++) /* ...get number computed */
150     complist[i].nc = bnrays(hdlist[complist[i].hd],
151     complist[i].bi);
152 gregl 3.12 listpos = 0;
153     lastin = -1; /* flag for initial sort */
154 gregl 3.11 }
155 gregl 3.2 return;
156     memerr:
157     error(SYSTEM, "out of memory in bundle_set");
158     }
159    
160    
161 gregl 3.13 double
162     beamvolume(hp, bi) /* compute approximate volume of a beam */
163 gregl 3.1 HOLO *hp;
164 gregl 3.13 int bi;
165 gregl 3.1 {
166 gregl 3.13 GCOORD gc[2];
167     FVECT cp[4], edgeA, edgeB, cent[2];
168     FVECT v, crossp[2], diffv;
169     double vol[2];
170     register int i;
171     /* get grid coordinates */
172     if (!hdbcoord(gc, hp, bi))
173     error(CONSISTENCY, "bad beam index in beamvolume");
174     for (i = 0; i < 2; i++) { /* compute cell area vectors */
175     hdcell(cp, hp, gc+i);
176     VSUM(edgeA, cp[1], cp[0], -1.0);
177     VSUM(edgeB, cp[3], cp[1], -1.0);
178     fcross(crossp[i], edgeA, edgeB);
179     VSUM(edgeA, cp[2], cp[3], -1.0);
180     VSUM(edgeB, cp[0], cp[2], -1.0);
181     fcross(v, edgeA, edgeB);
182     VSUM(crossp[i], crossp[i], v, 1.0);
183     /* compute center */
184     cent[i][0] = 0.5*(cp[0][0] + cp[2][0]);
185     cent[i][1] = 0.5*(cp[0][1] + cp[2][1]);
186     cent[i][2] = 0.5*(cp[0][2] + cp[2][2]);
187 gregl 3.1 }
188 gregl 3.13 /* compute difference vector */
189     VSUM(diffv, cent[1], cent[0], -1.0);
190     for (i = 0; i < 2; i++) { /* compute volume contributions */
191     vol[i] = 0.25*DOT(crossp[i], diffv);
192     if (vol[i] < 0.) vol[i] = -vol[i];
193     }
194     return(vol[0] + vol[1]); /* return total volume */
195 gregl 3.1 }
196    
197    
198     init_global() /* initialize global ray computation */
199     {
200     long wtotal = 0;
201     double frac;
202 gregl 3.13 int i;
203     register int j, k;
204 gregl 3.3 /* free old list */
205     if (complen > 0)
206     free((char *)complist);
207 gregl 3.1 /* allocate beam list */
208     complen = 0;
209     for (j = 0; hdlist[j] != NULL; j++)
210     complen += nbeams(hdlist[j]);
211     complist = (PACKHEAD *)malloc(complen*sizeof(PACKHEAD));
212     if (complist == NULL)
213     error(SYSTEM, "out of memory in init_global");
214     /* compute beam weights */
215     k = 0;
216 gregl 3.13 for (j = 0; hdlist[j] != NULL; j++) {
217     frac = 512. * hdlist[j]->wg[0] *
218     hdlist[j]->wg[1] * hdlist[j]->wg[2];
219 gregl 3.1 for (i = nbeams(hdlist[j]); i > 0; i--) {
220     complist[k].hd = j;
221     complist[k].bi = i;
222 gregl 3.13 complist[k].nr = frac*beamvolume(hdlist[j], i) + 0.5;
223 gregl 3.1 wtotal += complist[k++].nr;
224     }
225 gregl 3.13 }
226 gregl 3.1 /* adjust weights */
227 gregl 3.12 if (vdef(DISKSPACE))
228 gregl 3.1 frac = 1024.*1024.*vflt(DISKSPACE) / (wtotal*sizeof(RAYVAL));
229 gregl 3.12 else
230     frac = 1024.*1024.*16384. / (wtotal*sizeof(RAYVAL));
231     while (k--)
232     complist[k].nr = frac * complist[k].nr;
233 gregl 3.4 listpos = 0; lastin = -1; /* flag initial sort */
234 gregl 3.1 }
235    
236    
237     mergeclists(cdest, cl1, n1, cl2, n2) /* merge two sorted lists */
238     PACKHEAD *cdest;
239     PACKHEAD *cl1, *cl2;
240     int n1, n2;
241     {
242     int cmp;
243    
244     while (n1 | n2) {
245     if (!n1) cmp = 1;
246     else if (!n2) cmp = -1;
247     else cmp = beamcmp(cl1, cl2);
248     if (cmp > 0) {
249     copystruct(cdest, cl2);
250     cl2++; n2--;
251     } else {
252     copystruct(cdest, cl1);
253     cl1++; n1--;
254     }
255     cdest++;
256     }
257     }
258    
259    
260     sortcomplist() /* fix our list order */
261     {
262     PACKHEAD *list2;
263 gregl 3.2 register int i;
264    
265 gregl 3.3 if (complen <= 0) /* check to see if there is even a list */
266 gregl 3.2 return;
267 gregl 3.6 if (lastin < 0 || listpos*4 >= complen*3)
268 gregl 3.1 qsort((char *)complist, complen, sizeof(PACKHEAD), beamcmp);
269     else if (listpos) { /* else sort and merge sublist */
270     list2 = (PACKHEAD *)malloc(listpos*sizeof(PACKHEAD));
271     if (list2 == NULL)
272     error(SYSTEM, "out of memory in sortcomplist");
273     bcopy((char *)complist,(char *)list2,listpos*sizeof(PACKHEAD));
274     qsort((char *)list2, listpos, sizeof(PACKHEAD), beamcmp);
275     mergeclists(complist, list2, listpos,
276     complist+listpos, complen-listpos);
277     free((char *)list2);
278     }
279 gregl 3.2 /* drop satisfied requests */
280 gregl 3.11 for (i = complen; i-- && complist[i].nr <= complist[i].nc; )
281 gregl 3.2 ;
282 gregl 3.4 if (i < 0) {
283     free((char *)complist);
284     complist = NULL;
285     complen = 0;
286     } else if (i < complen-1) {
287 gregl 3.2 list2 = (PACKHEAD *)realloc((char *)complist,
288     (i+1)*sizeof(PACKHEAD));
289     if (list2 != NULL) {
290     complist = list2;
291     complen = i+1;
292     }
293     }
294     listpos = 0; lastin = i;
295 gregl 3.1 }
296    
297    
298     /*
299     * The following routine works on the assumption that the bundle weights are
300     * more or less evenly distributed, such that computing a packet causes
301     * a given bundle to move way down in the computation order. We keep
302     * track of where the computed bundle with the highest priority would end
303     * up, and if we get further in our compute list than this, we resort the
304 gregl 3.11 * list and start again from the beginning. Since
305     * a merge sort is used, the sorting costs are minimal.
306 gregl 3.1 */
307     next_packet(p) /* prepare packet for computation */
308     register PACKET *p;
309     {
310     register int i;
311    
312 gregl 3.10 if (listpos > lastin) /* time to sort the list */
313     sortcomplist();
314 gregl 3.1 if (complen <= 0)
315     return(0);
316     p->hd = complist[listpos].hd;
317     p->bi = complist[listpos].bi;
318 gregl 3.11 p->nc = complist[listpos].nc;
319     p->nr = complist[listpos].nr - p->nc;
320 gregl 3.1 if (p->nr <= 0)
321     return(0);
322     if (p->nr > RPACKSIZ)
323     p->nr = RPACKSIZ;
324 gregl 3.11 complist[listpos].nc += p->nr; /* find where this one would go */
325     while (lastin > listpos &&
326     beamcmp(complist+lastin, complist+listpos) > 0)
327 gregl 3.1 lastin--;
328     listpos++;
329     return(1);
330     }