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root/radiance/ray/src/hd/rholo3.c
Revision: 3.27
Committed: Thu Jan 7 22:04:49 1999 UTC (25 years, 9 months ago) by gwlarson
Content type: text/plain
Branch: MAIN
Changes since 3.26: +57 -3 lines
Log Message:
created hdfragflags variable for controlling fragment deallocation
added "chunky" sorting mode to rholo to decrease file fragmentation problems

File Contents

# User Rev Content
1 gwlarson 3.23 /* Copyright (c) 1998 Silicon Graphics, Inc. */
2    
3     #ifndef lint
4     static char SCCSid[] = "$SunId$ SGI";
5     #endif
6    
7 gregl 3.1 /*
8     * Routines for tracking beam compuatations
9     */
10    
11     #include "rholo.h"
12    
13 gwlarson 3.27 #ifndef NFRAG2CHUNK
14     #define NFRAG2CHUNK 4096 /* number of fragments to start chunking */
15     #endif
16    
17     #ifndef abs
18 gregl 3.1 #define abs(x) ((x) > 0 ? (x) : -(x))
19 gwlarson 3.27 #endif
20     #ifndef sgn
21 gregl 3.1 #define sgn(x) ((x) > 0 ? 1 : (x) < 0 ? -1 : 0)
22 gwlarson 3.27 #endif
23 gregl 3.1
24 gwlarson 3.27 #define rchunk(n) (((n)+(RPACKSIZ/2))/RPACKSIZ)
25    
26 gregl 3.4 static PACKHEAD *complist=NULL; /* list of beams to compute */
27     static int complen=0; /* length of complist */
28     static int listpos=0; /* current list position for next_packet */
29     static int lastin= -1; /* last ordered position in list */
30 gwlarson 3.27 static int chunky=0; /* clump beams together on disk */
31 gregl 3.1
32    
33     int
34 gwlarson 3.23 beamcmp(b0, b1) /* comparison for compute order */
35 gregl 3.2 register PACKHEAD *b0, *b1;
36     {
37 gwlarson 3.27 BEAMI *bip0, *bip1;
38     register long c;
39     /* first check desired quantities */
40     if (chunky)
41     c = rchunk(b1->nr)*(rchunk(b0->nc)+1) -
42     rchunk(b0->nr)*(rchunk(b1->nc)+1);
43     else
44     c = b1->nr*(b0->nc+1) - b0->nr*(b1->nc+1);
45     if (c) return(c);
46     /* only one file, so skip the following: */
47     #if 0
48     /* next, check file descriptors */
49     c = hdlist[b0->hd]->fd - hdlist[b1->hd]->fd;
50     if (c) return(c);
51     #endif
52     /* finally, check file positions */
53     bip0 = &hdlist[b0->hd]->bi[b0->bi];
54     bip1 = &hdlist[b1->hd]->bi[b1->bi];
55     /* put diskless beams last */
56     if (!bip0->nrd)
57     return(bip1->nrd > 0);
58     if (!bip1->nrd)
59     return(-1);
60     c = bip0->fo - bip1->fo;
61     return(c < 0 ? -1 : c > 0);
62 gregl 3.2 }
63    
64    
65 gregl 3.14 int
66 gwlarson 3.23 beamidcmp(b0, b1) /* comparison for beam searching */
67     register PACKHEAD *b0, *b1;
68     {
69     register int c = b0->hd - b1->hd;
70    
71     if (c) return(c);
72     return(b0->bi - b1->bi);
73     }
74    
75    
76     int
77     dispbeam(b, hb) /* display a holodeck beam */
78 gregl 3.14 register BEAM *b;
79 gwlarson 3.23 register HDBEAMI *hb;
80 gregl 3.14 {
81     static int n = 0;
82     static PACKHEAD *p = NULL;
83    
84     if (b == NULL)
85     return;
86     if (b->nrm > n) { /* (re)allocate packet holder */
87     n = b->nrm;
88     if (p == NULL) p = (PACKHEAD *)malloc(packsiz(n));
89     else p = (PACKHEAD *)realloc((char *)p, packsiz(n));
90     if (p == NULL)
91     error(SYSTEM, "out of memory in dispbeam");
92     }
93     /* assign packet fields */
94     bcopy((char *)hdbray(b), (char *)packra(p), b->nrm*sizeof(RAYVAL));
95     p->nr = p->nc = b->nrm;
96 gwlarson 3.23 for (p->hd = 0; hdlist[p->hd] != hb->h; p->hd++)
97 gregl 3.14 if (hdlist[p->hd] == NULL)
98     error(CONSISTENCY, "unregistered holodeck in dispbeam");
99 gwlarson 3.23 p->bi = hb->b;
100 gregl 3.14 disp_packet(p); /* display it */
101     }
102    
103    
104 gregl 3.2 bundle_set(op, clist, nents) /* bundle set operation */
105     int op;
106 gwlarson 3.23 PACKHEAD *clist;
107 gregl 3.2 int nents;
108     {
109 gwlarson 3.23 int oldnr, n;
110     HDBEAMI *hbarr;
111     register PACKHEAD *csm;
112     register int i;
113     /* search for common members */
114     for (csm = clist+nents; csm-- > clist; )
115     csm->nc = -1;
116 gwlarson 3.25 qsort((char *)clist, nents, sizeof(PACKHEAD), beamidcmp);
117 gwlarson 3.23 for (i = 0; i < complen; i++) {
118     csm = (PACKHEAD *)bsearch((char *)(complist+i), (char *)clist,
119     nents, sizeof(PACKHEAD), beamidcmp);
120     if (csm == NULL)
121     continue;
122     oldnr = complist[i].nr;
123     csm->nc = complist[i].nc;
124     switch (op) {
125     case BS_ADD: /* add to count */
126     complist[i].nr += csm->nr;
127     csm->nr = 0;
128     break;
129     case BS_ADJ: /* reset count */
130     complist[i].nr = csm->nr;
131     csm->nr = 0;
132     break;
133     case BS_DEL: /* delete count */
134     if (csm->nr == 0 || csm->nr >= complist[i].nr)
135     complist[i].nr = 0;
136     else
137     complist[i].nr -= csm->nr;
138     break;
139     }
140     if (complist[i].nr != oldnr)
141     lastin = -1; /* flag sort */
142 gregl 3.20 }
143 gwlarson 3.24 /* record computed rays for uncommon beams */
144 gwlarson 3.23 for (csm = clist+nents; csm-- > clist; )
145     if (csm->nc < 0)
146     csm->nc = bnrays(hdlist[csm->hd], csm->bi);
147 gregl 3.20 /* complete list operations */
148 gregl 3.2 switch (op) {
149     case BS_NEW: /* new computation set */
150 gwlarson 3.21 listpos = 0; lastin = -1;
151 gregl 3.20 if (complen) /* free old list */
152 gregl 3.2 free((char *)complist);
153 gregl 3.20 complist = NULL;
154     if (!(complen = nents))
155 gregl 3.2 return;
156     complist = (PACKHEAD *)malloc(nents*sizeof(PACKHEAD));
157     if (complist == NULL)
158     goto memerr;
159     bcopy((char *)clist, (char *)complist, nents*sizeof(PACKHEAD));
160     break;
161     case BS_ADD: /* add to computation set */
162 gregl 3.11 case BS_ADJ: /* adjust set quantities */
163 gregl 3.2 if (nents <= 0)
164     return;
165 gregl 3.20 sortcomplist(); /* sort updated list & new entries */
166 gregl 3.2 qsort((char *)clist, nents, sizeof(PACKHEAD), beamcmp);
167     /* what can't we satisfy? */
168 gwlarson 3.23 for (i = nents, csm = clist; i-- && csm->nr > csm->nc; csm++)
169 gregl 3.2 ;
170 gwlarson 3.23 n = csm - clist;
171 gwlarson 3.22 if (op == BS_ADJ) { /* don't regenerate adjusted beams */
172 gwlarson 3.24 for (++i; i-- && csm->nr > 0; csm++)
173 gwlarson 3.22 ;
174 gwlarson 3.24 nents = csm - clist;
175 gwlarson 3.22 }
176 gregl 3.2 if (n) { /* allocate space for merged list */
177     PACKHEAD *newlist;
178     newlist = (PACKHEAD *)malloc(
179     (complen+n)*sizeof(PACKHEAD) );
180     if (newlist == NULL)
181     goto memerr;
182     /* merge lists */
183     mergeclists(newlist, clist, n, complist, complen);
184     if (complen)
185     free((char *)complist);
186     complist = newlist;
187     complen += n;
188     }
189     listpos = 0;
190     lastin = complen-1; /* list is now sorted */
191     break;
192     case BS_DEL: /* delete from computation set */
193 gregl 3.20 return; /* already done */
194 gregl 3.2 default:
195     error(CONSISTENCY, "bundle_set called with unknown operation");
196     }
197 gwlarson 3.27 if (outdev == NULL || !nents) /* nothing to display? */
198 gwlarson 3.22 return;
199     /* load and display beams we have */
200 gwlarson 3.23 hbarr = (HDBEAMI *)malloc(nents*sizeof(HDBEAMI));
201     for (i = nents; i--; ) {
202     hbarr[i].h = hdlist[clist[i].hd];
203     hbarr[i].b = clist[i].bi;
204 gregl 3.11 }
205 gwlarson 3.23 hdloadbeams(hbarr, nents, dispbeam);
206     free((char *)hbarr);
207 gwlarson 3.27 if (hdfragflags&FF_READ) {
208     listpos = 0;
209     lastin = -1; /* need to re-sort list */
210     }
211 gregl 3.2 return;
212     memerr:
213     error(SYSTEM, "out of memory in bundle_set");
214     }
215    
216    
217 gregl 3.13 double
218     beamvolume(hp, bi) /* compute approximate volume of a beam */
219 gregl 3.1 HOLO *hp;
220 gregl 3.13 int bi;
221 gregl 3.1 {
222 gregl 3.13 GCOORD gc[2];
223     FVECT cp[4], edgeA, edgeB, cent[2];
224     FVECT v, crossp[2], diffv;
225     double vol[2];
226     register int i;
227     /* get grid coordinates */
228     if (!hdbcoord(gc, hp, bi))
229     error(CONSISTENCY, "bad beam index in beamvolume");
230     for (i = 0; i < 2; i++) { /* compute cell area vectors */
231     hdcell(cp, hp, gc+i);
232     VSUM(edgeA, cp[1], cp[0], -1.0);
233     VSUM(edgeB, cp[3], cp[1], -1.0);
234     fcross(crossp[i], edgeA, edgeB);
235     /* compute center */
236     cent[i][0] = 0.5*(cp[0][0] + cp[2][0]);
237     cent[i][1] = 0.5*(cp[0][1] + cp[2][1]);
238     cent[i][2] = 0.5*(cp[0][2] + cp[2][2]);
239 gregl 3.1 }
240 gregl 3.13 /* compute difference vector */
241     VSUM(diffv, cent[1], cent[0], -1.0);
242     for (i = 0; i < 2; i++) { /* compute volume contributions */
243 gregl 3.15 vol[i] = 0.5*DOT(crossp[i], diffv);
244 gregl 3.13 if (vol[i] < 0.) vol[i] = -vol[i];
245     }
246     return(vol[0] + vol[1]); /* return total volume */
247 gregl 3.1 }
248    
249    
250     init_global() /* initialize global ray computation */
251     {
252     long wtotal = 0;
253     double frac;
254 gregl 3.13 int i;
255     register int j, k;
256 gregl 3.18 /* free old list and empty queue */
257     if (complen > 0) {
258 gregl 3.3 free((char *)complist);
259 gregl 3.18 done_packets(flush_queue());
260     }
261 gregl 3.1 /* allocate beam list */
262     complen = 0;
263     for (j = 0; hdlist[j] != NULL; j++)
264     complen += nbeams(hdlist[j]);
265     complist = (PACKHEAD *)malloc(complen*sizeof(PACKHEAD));
266     if (complist == NULL)
267     error(SYSTEM, "out of memory in init_global");
268     /* compute beam weights */
269     k = 0;
270 gregl 3.13 for (j = 0; hdlist[j] != NULL; j++) {
271 gregl 3.19 frac = 512. * VLEN(hdlist[j]->wg[0]) *
272     VLEN(hdlist[j]->wg[1]) *
273     VLEN(hdlist[j]->wg[2]);
274 gregl 3.1 for (i = nbeams(hdlist[j]); i > 0; i--) {
275     complist[k].hd = j;
276     complist[k].bi = i;
277 gregl 3.13 complist[k].nr = frac*beamvolume(hdlist[j], i) + 0.5;
278 gregl 3.18 complist[k].nc = bnrays(hdlist[j], i);
279 gregl 3.1 wtotal += complist[k++].nr;
280     }
281 gregl 3.13 }
282 gregl 3.1 /* adjust weights */
283 gregl 3.12 if (vdef(DISKSPACE))
284 gregl 3.1 frac = 1024.*1024.*vflt(DISKSPACE) / (wtotal*sizeof(RAYVAL));
285 gregl 3.12 else
286     frac = 1024.*1024.*16384. / (wtotal*sizeof(RAYVAL));
287     while (k--)
288 gwlarson 3.24 complist[k].nr = frac*complist[k].nr + 0.5;
289 gwlarson 3.21 listpos = 0; lastin = -1; /* perform initial sort */
290     sortcomplist();
291 gwlarson 3.25 /* no view vicinity */
292     myeye.rng = 0;
293 gregl 3.1 }
294    
295    
296     mergeclists(cdest, cl1, n1, cl2, n2) /* merge two sorted lists */
297 gregl 3.16 register PACKHEAD *cdest;
298     register PACKHEAD *cl1, *cl2;
299 gregl 3.1 int n1, n2;
300     {
301 gregl 3.16 register int cmp;
302 gregl 3.1
303     while (n1 | n2) {
304     if (!n1) cmp = 1;
305     else if (!n2) cmp = -1;
306     else cmp = beamcmp(cl1, cl2);
307     if (cmp > 0) {
308     copystruct(cdest, cl2);
309     cl2++; n2--;
310     } else {
311     copystruct(cdest, cl1);
312     cl1++; n1--;
313     }
314     cdest++;
315     }
316     }
317    
318    
319     sortcomplist() /* fix our list order */
320     {
321     PACKHEAD *list2;
322 gwlarson 3.27 int listlen;
323 gregl 3.2 register int i;
324    
325 gregl 3.3 if (complen <= 0) /* check to see if there is even a list */
326 gregl 3.2 return;
327 gwlarson 3.27 if (!chunky) /* check to see if fragment list is full */
328     if (!hdfragOK(hdlist[0]->fd, &listlen, NULL)
329     #if NFRAG2CHUNK
330     || listlen >= NFRAG2CHUNK
331     #endif
332     ) {
333     #ifdef DEBUG
334     error(WARNING, "using chunky comparison mode");
335     #endif
336     chunky++; /* use "chunky" comparison */
337     lastin = -1; /* need to re-sort list */
338     }
339 gregl 3.6 if (lastin < 0 || listpos*4 >= complen*3)
340 gregl 3.1 qsort((char *)complist, complen, sizeof(PACKHEAD), beamcmp);
341     else if (listpos) { /* else sort and merge sublist */
342     list2 = (PACKHEAD *)malloc(listpos*sizeof(PACKHEAD));
343     if (list2 == NULL)
344     error(SYSTEM, "out of memory in sortcomplist");
345     bcopy((char *)complist,(char *)list2,listpos*sizeof(PACKHEAD));
346     qsort((char *)list2, listpos, sizeof(PACKHEAD), beamcmp);
347     mergeclists(complist, list2, listpos,
348     complist+listpos, complen-listpos);
349     free((char *)list2);
350     }
351 gregl 3.2 /* drop satisfied requests */
352 gregl 3.11 for (i = complen; i-- && complist[i].nr <= complist[i].nc; )
353 gregl 3.2 ;
354 gregl 3.4 if (i < 0) {
355     free((char *)complist);
356     complist = NULL;
357     complen = 0;
358     } else if (i < complen-1) {
359 gregl 3.2 list2 = (PACKHEAD *)realloc((char *)complist,
360     (i+1)*sizeof(PACKHEAD));
361 gwlarson 3.26 if (list2 != NULL)
362 gregl 3.2 complist = list2;
363 gwlarson 3.26 complen = i+1;
364 gregl 3.2 }
365     listpos = 0; lastin = i;
366 gregl 3.1 }
367    
368    
369     /*
370     * The following routine works on the assumption that the bundle weights are
371     * more or less evenly distributed, such that computing a packet causes
372     * a given bundle to move way down in the computation order. We keep
373     * track of where the computed bundle with the highest priority would end
374 gwlarson 3.27 * up, and if we get further in our compute list than this, we re-sort the
375 gregl 3.11 * list and start again from the beginning. Since
376     * a merge sort is used, the sorting costs are minimal.
377 gregl 3.1 */
378 gregl 3.17 next_packet(p, n) /* prepare packet for computation */
379 gregl 3.1 register PACKET *p;
380 gregl 3.17 int n;
381 gregl 3.1 {
382     register int i;
383    
384 gregl 3.10 if (listpos > lastin) /* time to sort the list */
385     sortcomplist();
386 gregl 3.1 if (complen <= 0)
387     return(0);
388     p->hd = complist[listpos].hd;
389     p->bi = complist[listpos].bi;
390 gregl 3.11 p->nc = complist[listpos].nc;
391     p->nr = complist[listpos].nr - p->nc;
392 gregl 3.1 if (p->nr <= 0)
393     return(0);
394 gregl 3.17 #ifdef DEBUG
395     if (n < 1 | n > RPACKSIZ)
396     error(CONSISTENCY, "next_packet called with bad n value");
397     #endif
398     if (p->nr > n)
399     p->nr = n;
400 gregl 3.11 complist[listpos].nc += p->nr; /* find where this one would go */
401 gwlarson 3.27 if (hdgetbeam(hdlist[p->hd], p->bi) != NULL)
402     hdfreefrag(hdlist[p->hd], p->bi);
403 gregl 3.11 while (lastin > listpos &&
404     beamcmp(complist+lastin, complist+listpos) > 0)
405 gregl 3.1 lastin--;
406     listpos++;
407     return(1);
408     }