| 1 |
/* Copyright (c) 1991 Regents of the University of California */ |
| 2 |
|
| 3 |
#ifndef lint |
| 4 |
static char SCCSid[] = "$SunId$ LBL"; |
| 5 |
#endif |
| 6 |
|
| 7 |
/* |
| 8 |
* Compute pixels for glare calculation |
| 9 |
*/ |
| 10 |
|
| 11 |
#include "glare.h" |
| 12 |
#include <sys/param.h> |
| 13 |
/* compute rtrace buffer size */ |
| 14 |
#ifndef PIPE_BUF |
| 15 |
#define PIPE_BUF 512 /* hyperconservative */ |
| 16 |
#endif |
| 17 |
#define MAXPIX (PIPE_BUF/(6*sizeof(float)) - 1) |
| 18 |
|
| 19 |
#ifndef BSD |
| 20 |
#define vfork fork |
| 21 |
#endif |
| 22 |
|
| 23 |
#define MAXSBUF 786432 /* maximum total size of scanline buffer */ |
| 24 |
#define HSIZE 317 /* size of scanline hash table */ |
| 25 |
#define NRETIRE 16 /* number of scanlines to retire at once */ |
| 26 |
|
| 27 |
int rt_pid = -1; /* process id for rtrace */ |
| 28 |
int fd_tort, fd_fromrt; /* pipe descriptors */ |
| 29 |
|
| 30 |
FILE *pictfp = NULL; /* picture file pointer */ |
| 31 |
double exposure; /* picture exposure */ |
| 32 |
int pxsiz, pysiz; /* picture dimensions */ |
| 33 |
|
| 34 |
static int curpos; /* current scanline */ |
| 35 |
static long *scanpos; /* scanline positions */ |
| 36 |
|
| 37 |
typedef struct scan { |
| 38 |
int y; /* scanline position */ |
| 39 |
long lused; /* for LRU replacement */ |
| 40 |
struct scan *next; /* next in this hash or free list */ |
| 41 |
/* followed by the scanline data */ |
| 42 |
} SCAN; /* buffered scanline */ |
| 43 |
|
| 44 |
#define scandata(sl) ((COLR *)((sl)+1)) |
| 45 |
#define shash(y) ((y)%HSIZE) |
| 46 |
|
| 47 |
static SCAN *freelist; /* scanline free list */ |
| 48 |
static SCAN *hashtab[HSIZE]; /* scanline hash table */ |
| 49 |
|
| 50 |
static long ncall = 0L; /* number of calls to getpictscan */ |
| 51 |
static long nread = 0L; /* number of scanlines read */ |
| 52 |
static long nrecl = 0L; /* number of scanlines reclaimed */ |
| 53 |
|
| 54 |
static int wrongformat = 0; |
| 55 |
|
| 56 |
SCAN *scanretire(); |
| 57 |
|
| 58 |
extern long ftell(); |
| 59 |
|
| 60 |
|
| 61 |
SCAN * |
| 62 |
claimscan(y) /* claim scanline from buffers */ |
| 63 |
int y; |
| 64 |
{ |
| 65 |
int hi = shash(y); |
| 66 |
SCAN *slast; |
| 67 |
register SCAN *sl; |
| 68 |
|
| 69 |
for (sl = hashtab[hi]; sl != NULL; sl = sl->next) |
| 70 |
if (sl->y == y) /* active scanline */ |
| 71 |
return(sl); |
| 72 |
for (slast = NULL, sl = freelist; sl != NULL; slast = sl, sl = sl->next) |
| 73 |
if (sl->y == -1 || sl->y == y || sl->next == NULL) { |
| 74 |
if (slast == NULL) /* remove from free */ |
| 75 |
freelist = sl->next; |
| 76 |
else |
| 77 |
slast->next = sl->next; |
| 78 |
if (sl->y == y) { /* reclaim */ |
| 79 |
sl->next = hashtab[hi]; |
| 80 |
hashtab[hi] = sl; |
| 81 |
nrecl++; |
| 82 |
} |
| 83 |
return(sl); |
| 84 |
} |
| 85 |
return(scanretire()); /* need more free scanlines */ |
| 86 |
} |
| 87 |
|
| 88 |
|
| 89 |
COLR * |
| 90 |
getpictscan(y) /* get picture scanline */ |
| 91 |
int y; |
| 92 |
{ |
| 93 |
register SCAN *sl; |
| 94 |
register int i; |
| 95 |
/* first check our buffers */ |
| 96 |
sl = claimscan(y); |
| 97 |
if (sl == NULL) |
| 98 |
memerr("claimscan()"); |
| 99 |
sl->lused = ncall++; |
| 100 |
if (sl->y == y) /* scan hit */ |
| 101 |
return(scandata(sl)); |
| 102 |
/* else read in replacement */ |
| 103 |
if (scanpos[y] < 0) { /* need to search */ |
| 104 |
for (i = y+1; i < curpos; i++) |
| 105 |
if (scanpos[i] >= 0) { |
| 106 |
if (fseek(pictfp, scanpos[i], 0) < 0) |
| 107 |
goto seekerr; |
| 108 |
curpos = i; |
| 109 |
break; |
| 110 |
} |
| 111 |
while (curpos >= y) { |
| 112 |
scanpos[curpos] = ftell(pictfp); |
| 113 |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
| 114 |
goto readerr; |
| 115 |
nread++; |
| 116 |
curpos--; |
| 117 |
} |
| 118 |
} else { |
| 119 |
if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0) |
| 120 |
goto seekerr; |
| 121 |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
| 122 |
goto readerr; |
| 123 |
nread++; |
| 124 |
curpos = y-1; |
| 125 |
} |
| 126 |
sl->y = y; |
| 127 |
i = shash(y); /* add to hash list */ |
| 128 |
sl->next = hashtab[i]; |
| 129 |
hashtab[i] = sl; |
| 130 |
return(scandata(sl)); |
| 131 |
readerr: |
| 132 |
fprintf(stderr, "%s: picture read error\n", progname); |
| 133 |
exit(1); |
| 134 |
seekerr: |
| 135 |
fprintf(stderr, "%s: picture seek error\n", progname); |
| 136 |
exit(1); |
| 137 |
} |
| 138 |
|
| 139 |
|
| 140 |
#ifdef DEBUG |
| 141 |
pict_stats() /* print out picture read statistics */ |
| 142 |
{ |
| 143 |
static long lastcall = 0L; /* ncall at last report */ |
| 144 |
static long lastread = 0L; /* nread at last report */ |
| 145 |
static long lastrecl = 0L; /* nrecl at last report */ |
| 146 |
|
| 147 |
if (ncall == lastcall) |
| 148 |
return; |
| 149 |
fprintf(stderr, "%s: %ld scanlines read (%ld reclaimed) in %ld calls\n", |
| 150 |
progname, nread-lastread, nrecl-lastrecl, ncall-lastcall); |
| 151 |
lastcall = ncall; |
| 152 |
lastread = nread; |
| 153 |
lastrecl = nrecl; |
| 154 |
} |
| 155 |
#endif |
| 156 |
|
| 157 |
|
| 158 |
double |
| 159 |
pict_val(vd) /* find picture value for view direction */ |
| 160 |
FVECT vd; |
| 161 |
{ |
| 162 |
FVECT pp; |
| 163 |
double vpx, vpy, vpz; |
| 164 |
COLOR res; |
| 165 |
|
| 166 |
if (pictfp == NULL) |
| 167 |
return(-1.0); |
| 168 |
pp[0] = pictview.vp[0] + vd[0]; |
| 169 |
pp[1] = pictview.vp[1] + vd[1]; |
| 170 |
pp[2] = pictview.vp[2] + vd[2]; |
| 171 |
viewpixel(&vpx, &vpy, &vpz, &pictview, pp); |
| 172 |
if (vpz <= FTINY || vpx < 0. || vpx >= 1. || vpy < 0. || vpy >= 1.) |
| 173 |
return(-1.0); |
| 174 |
colr_color(res, getpictscan((int)(vpy*pysiz))[(int)(vpx*pxsiz)]); |
| 175 |
return(luminance(res)/exposure); |
| 176 |
} |
| 177 |
|
| 178 |
|
| 179 |
double |
| 180 |
getviewpix(vh, vv) /* compute single view pixel */ |
| 181 |
int vh, vv; |
| 182 |
{ |
| 183 |
FVECT dir; |
| 184 |
float rt_buf[6]; |
| 185 |
double res; |
| 186 |
|
| 187 |
if (compdir(dir, vh, vv) < 0) |
| 188 |
return(-1.0); |
| 189 |
npixinvw++; |
| 190 |
if ((res = pict_val(dir)) >= 0.0) |
| 191 |
return(res); |
| 192 |
if (rt_pid == -1) { |
| 193 |
npixmiss++; |
| 194 |
return(-1.0); |
| 195 |
} |
| 196 |
rt_buf[0] = ourview.vp[0]; |
| 197 |
rt_buf[1] = ourview.vp[1]; |
| 198 |
rt_buf[2] = ourview.vp[2]; |
| 199 |
rt_buf[3] = dir[0]; |
| 200 |
rt_buf[4] = dir[1]; |
| 201 |
rt_buf[5] = dir[2]; |
| 202 |
rt_compute(rt_buf, 1); |
| 203 |
return(luminance(rt_buf)); |
| 204 |
} |
| 205 |
|
| 206 |
|
| 207 |
getviewspan(vv, vb) /* compute a span of view pixels */ |
| 208 |
int vv; |
| 209 |
float *vb; |
| 210 |
{ |
| 211 |
float rt_buf[6*MAXPIX]; /* rtrace send/receive buffer */ |
| 212 |
register int n; /* number of pixels in buffer */ |
| 213 |
short buf_vh[MAXPIX]; /* pixel positions */ |
| 214 |
FVECT dir; |
| 215 |
register int vh; |
| 216 |
|
| 217 |
#ifdef DEBUG |
| 218 |
if (verbose) |
| 219 |
fprintf(stderr, "%s: computing view span at %d...\n", |
| 220 |
progname, vv); |
| 221 |
#endif |
| 222 |
n = 0; |
| 223 |
for (vh = -hsize; vh <= hsize; vh++) { |
| 224 |
if (compdir(dir, vh, vv) < 0) { /* not in view */ |
| 225 |
vb[vh+hsize] = -1.0; |
| 226 |
continue; |
| 227 |
} |
| 228 |
npixinvw++; |
| 229 |
if ((vb[vh+hsize] = pict_val(dir)) >= 0.0) |
| 230 |
continue; |
| 231 |
if (rt_pid == -1) { /* missing information */ |
| 232 |
npixmiss++; |
| 233 |
continue; |
| 234 |
} |
| 235 |
/* send to rtrace */ |
| 236 |
if (n >= MAXPIX) { /* flush */ |
| 237 |
rt_compute(rt_buf, n); |
| 238 |
while (n-- > 0) |
| 239 |
vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
| 240 |
} |
| 241 |
rt_buf[6*n] = ourview.vp[0]; |
| 242 |
rt_buf[6*n+1] = ourview.vp[1]; |
| 243 |
rt_buf[6*n+2] = ourview.vp[2]; |
| 244 |
rt_buf[6*n+3] = dir[0]; |
| 245 |
rt_buf[6*n+4] = dir[1]; |
| 246 |
rt_buf[6*n+5] = dir[2]; |
| 247 |
buf_vh[n++] = vh; |
| 248 |
} |
| 249 |
#ifdef DEBUG |
| 250 |
if (verbose) |
| 251 |
pict_stats(); |
| 252 |
#endif |
| 253 |
if (n > 0) { /* process pending buffer */ |
| 254 |
rt_compute(rt_buf, n); |
| 255 |
while (n-- > 0) |
| 256 |
vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
| 257 |
} |
| 258 |
} |
| 259 |
|
| 260 |
|
| 261 |
rt_compute(pb, np) /* process buffer through rtrace */ |
| 262 |
float *pb; |
| 263 |
int np; |
| 264 |
{ |
| 265 |
static float nbuf[6] = {0.,0.,0.,0.,0.,0.}; |
| 266 |
|
| 267 |
#ifdef DEBUG |
| 268 |
if (verbose && np > 1) |
| 269 |
fprintf(stderr, "%s: sending %d samples to rtrace...\n", |
| 270 |
progname, np); |
| 271 |
#endif |
| 272 |
if (writebuf(fd_tort,(char *)pb,6*sizeof(float)*np) < 6*sizeof(float)*np |
| 273 |
|| writebuf(fd_tort,(char *)nbuf,sizeof(nbuf)) < sizeof(nbuf)) { |
| 274 |
fprintf(stderr, "%s: error writing to rtrace process\n", |
| 275 |
progname); |
| 276 |
exit(1); |
| 277 |
} |
| 278 |
if (readbuf(fd_fromrt, (char *)pb, 3*sizeof(float)*np) |
| 279 |
< 3*sizeof(float)*np) { |
| 280 |
fprintf(stderr, "%s: error reading from rtrace process\n", |
| 281 |
progname); |
| 282 |
exit(1); |
| 283 |
} |
| 284 |
} |
| 285 |
|
| 286 |
|
| 287 |
getexpos(s) /* get exposure from header line */ |
| 288 |
char *s; |
| 289 |
{ |
| 290 |
char fmt[32]; |
| 291 |
|
| 292 |
if (isexpos(s)) |
| 293 |
exposure *= exposval(s); |
| 294 |
else if (isformat(s)) { |
| 295 |
formatval(fmt, s); |
| 296 |
wrongformat = strcmp(fmt, COLRFMT); |
| 297 |
} |
| 298 |
} |
| 299 |
|
| 300 |
|
| 301 |
open_pict(fn) /* open picture file */ |
| 302 |
char *fn; |
| 303 |
{ |
| 304 |
if ((pictfp = fopen(fn, "r")) == NULL) { |
| 305 |
fprintf("%s: cannot open\n", fn); |
| 306 |
exit(1); |
| 307 |
} |
| 308 |
exposure = 1.0; |
| 309 |
getheader(pictfp, getexpos, NULL); |
| 310 |
if (wrongformat || |
| 311 |
fgetresolu(&pxsiz, &pysiz, pictfp) != (YMAJOR|YDECR)) { |
| 312 |
fprintf("%s: bad picture format\n", fn); |
| 313 |
exit(1); |
| 314 |
} |
| 315 |
initscans(); |
| 316 |
} |
| 317 |
|
| 318 |
|
| 319 |
close_pict() /* done with picture */ |
| 320 |
{ |
| 321 |
if (pictfp == NULL) |
| 322 |
return; |
| 323 |
fclose(pictfp); |
| 324 |
donescans(); |
| 325 |
pictfp = NULL; |
| 326 |
} |
| 327 |
|
| 328 |
|
| 329 |
fork_rtrace(av) /* open pipe and start rtrace */ |
| 330 |
char *av[]; |
| 331 |
{ |
| 332 |
int p0[2], p1[2]; |
| 333 |
|
| 334 |
if (pipe(p0) < 0 || pipe(p1) < 0) { |
| 335 |
perror(progname); |
| 336 |
exit(1); |
| 337 |
} |
| 338 |
if ((rt_pid = vfork()) == 0) { /* if child */ |
| 339 |
close(p0[1]); |
| 340 |
close(p1[0]); |
| 341 |
if (p0[0] != 0) { /* connect p0 to stdin */ |
| 342 |
dup2(p0[0], 0); |
| 343 |
close(p0[0]); |
| 344 |
} |
| 345 |
if (p1[1] != 0) { /* connect p1 to stdout */ |
| 346 |
dup2(p1[1], 1); |
| 347 |
close(p1[1]); |
| 348 |
} |
| 349 |
execvp(av[0], av); |
| 350 |
perror(av[0]); |
| 351 |
_exit(127); |
| 352 |
} |
| 353 |
if (rt_pid == -1) { |
| 354 |
perror(progname); |
| 355 |
exit(1); |
| 356 |
} |
| 357 |
close(p0[0]); |
| 358 |
close(p1[1]); |
| 359 |
fd_tort = p0[1]; |
| 360 |
fd_fromrt = p1[0]; |
| 361 |
} |
| 362 |
|
| 363 |
|
| 364 |
done_rtrace() /* wait for rtrace to finish */ |
| 365 |
{ |
| 366 |
int pid, status; |
| 367 |
|
| 368 |
if (rt_pid == -1) |
| 369 |
return; |
| 370 |
close(fd_tort); |
| 371 |
close(fd_fromrt); |
| 372 |
while ((pid = wait(&status)) != -1 && pid != rt_pid) |
| 373 |
; |
| 374 |
if (pid == rt_pid && status != 0) { |
| 375 |
fprintf(stderr, "%s: bad status (%d) from rtrace\n", |
| 376 |
progname, status); |
| 377 |
exit(1); |
| 378 |
} |
| 379 |
rt_pid = -1; |
| 380 |
} |
| 381 |
|
| 382 |
|
| 383 |
int |
| 384 |
readbuf(fd, bpos, siz) |
| 385 |
int fd; |
| 386 |
char *bpos; |
| 387 |
int siz; |
| 388 |
{ |
| 389 |
register int cc, nrem = siz; |
| 390 |
|
| 391 |
while (nrem > 0 && (cc = read(fd, bpos, nrem)) > 0) { |
| 392 |
bpos += cc; |
| 393 |
nrem -= cc; |
| 394 |
} |
| 395 |
if (cc < 0) |
| 396 |
return(cc); |
| 397 |
return(siz-nrem); |
| 398 |
} |
| 399 |
|
| 400 |
|
| 401 |
int |
| 402 |
writebuf(fd, bpos, siz) |
| 403 |
char *bpos; |
| 404 |
int siz; |
| 405 |
{ |
| 406 |
register int cc, nrem = siz; |
| 407 |
|
| 408 |
while (nrem > 0 && (cc = write(fd, bpos, nrem)) > 0) { |
| 409 |
bpos += cc; |
| 410 |
nrem -= cc; |
| 411 |
} |
| 412 |
if (cc < 0) |
| 413 |
return(cc); |
| 414 |
return(siz-nrem); |
| 415 |
} |
| 416 |
|
| 417 |
|
| 418 |
SCAN * |
| 419 |
scanretire() /* retire old scanlines to free list */ |
| 420 |
{ |
| 421 |
SCAN *sold[NRETIRE]; |
| 422 |
int n; |
| 423 |
int h; |
| 424 |
register SCAN *sl; |
| 425 |
register int i; |
| 426 |
/* grab the NRETIRE oldest scanlines */ |
| 427 |
sold[n = 0] = NULL; |
| 428 |
for (h = 0; h < HSIZE; h++) |
| 429 |
for (sl = hashtab[h]; sl != NULL; sl = sl->next) { |
| 430 |
for (i = n; i && sold[i-1]->lused > sl->lused; i--) |
| 431 |
if (i < NRETIRE) |
| 432 |
sold[i] = sold[i-1]; |
| 433 |
if (i < NRETIRE) { |
| 434 |
sold[i] = sl; |
| 435 |
if (n < NRETIRE) /* grow list */ |
| 436 |
n++; |
| 437 |
} |
| 438 |
} |
| 439 |
/* put scanlines into free list */ |
| 440 |
for (i = 0; i < n; i++) { |
| 441 |
h = shash(sold[i]->y); |
| 442 |
sl = hashtab[h]; |
| 443 |
if (sl == sold[i]) |
| 444 |
hashtab[h] = sl->next; |
| 445 |
else { |
| 446 |
while (sl->next != sold[i]) /* IS in list */ |
| 447 |
sl = sl->next; |
| 448 |
sl->next = sold[i]->next; |
| 449 |
} |
| 450 |
if (i > 0) { /* save oldest as return value */ |
| 451 |
sold[i]->next = freelist; |
| 452 |
freelist = sold[i]; |
| 453 |
} |
| 454 |
} |
| 455 |
return(sold[0]); |
| 456 |
} |
| 457 |
|
| 458 |
|
| 459 |
static char *scan_buf; |
| 460 |
|
| 461 |
|
| 462 |
initscans() /* initialize scanline buffers */ |
| 463 |
{ |
| 464 |
int scansize; |
| 465 |
register SCAN *ptr; |
| 466 |
register int i; |
| 467 |
/* initialize positions */ |
| 468 |
scanpos = (long *)malloc(pysiz*sizeof(long)); |
| 469 |
if (scanpos == NULL) |
| 470 |
memerr("scanline positions"); |
| 471 |
for (i = pysiz-1; i >= 0; i--) |
| 472 |
scanpos[i] = -1L; |
| 473 |
curpos = pysiz-1; |
| 474 |
/* clear hash table */ |
| 475 |
for (i = 0; i < HSIZE; i++) |
| 476 |
hashtab[i] = NULL; |
| 477 |
/* allocate scanline buffers */ |
| 478 |
scansize = sizeof(SCAN) + pxsiz*sizeof(COLR); |
| 479 |
#ifdef ALIGN |
| 480 |
scansize = scansize+(sizeof(ALIGN)-1)) & ~(sizeof(ALIGN)-1); |
| 481 |
#endif |
| 482 |
i = MAXSBUF / scansize; /* compute number to allocate */ |
| 483 |
if (i > HSIZE) |
| 484 |
i = HSIZE; |
| 485 |
scan_buf = malloc(i*scansize); /* get in one big chunk */ |
| 486 |
if (scan_buf == NULL) |
| 487 |
memerr("scanline buffers"); |
| 488 |
ptr = (SCAN *)scan_buf; |
| 489 |
freelist = NULL; /* build our free list */ |
| 490 |
while (i-- > 0) { |
| 491 |
ptr->y = -1; |
| 492 |
ptr->lused = -1; |
| 493 |
ptr->next = freelist; |
| 494 |
freelist = ptr; |
| 495 |
ptr = (SCAN *)((char *)ptr + scansize); /* beware of C bugs */ |
| 496 |
} |
| 497 |
} |
| 498 |
|
| 499 |
|
| 500 |
donescans() /* free up scanlines */ |
| 501 |
{ |
| 502 |
free(scan_buf); |
| 503 |
free((char *)scanpos); |
| 504 |
} |
