| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id$"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Compute pixels for glare calculation |
| 6 |
*/ |
| 7 |
|
| 8 |
#include "glare.h" |
| 9 |
/* maximum rtrace buffer size */ |
| 10 |
#define MAXPIX (4096/(6*sizeof(float))) |
| 11 |
|
| 12 |
#define MAXSBUF 786432 /* maximum total size of scanline buffer */ |
| 13 |
#define HSIZE 317 /* size of scanline hash table */ |
| 14 |
#define NRETIRE 16 /* number of scanlines to retire at once */ |
| 15 |
|
| 16 |
int rt_pd[3] = {-1,-1,-1}; /* process id & descriptors for rtrace */ |
| 17 |
|
| 18 |
FILE *pictfp = NULL; /* picture file pointer */ |
| 19 |
double exposure; /* picture exposure */ |
| 20 |
int pxsiz, pysiz; /* picture dimensions */ |
| 21 |
|
| 22 |
static int curpos; /* current scanline */ |
| 23 |
static long *scanpos; /* scanline positions */ |
| 24 |
|
| 25 |
typedef struct scan { |
| 26 |
int y; /* scanline position */ |
| 27 |
long lused; /* for LRU replacement */ |
| 28 |
struct scan *next; /* next in this hash or free list */ |
| 29 |
/* followed by the scanline data */ |
| 30 |
} SCAN; /* buffered scanline */ |
| 31 |
|
| 32 |
#define scandata(sl) ((COLR *)((sl)+1)) |
| 33 |
#define shash(y) ((y)%HSIZE) |
| 34 |
|
| 35 |
static int maxpix; /* maximum number of pixels to buffer */ |
| 36 |
|
| 37 |
static SCAN *freelist; /* scanline free list */ |
| 38 |
static SCAN *hashtab[HSIZE]; /* scanline hash table */ |
| 39 |
|
| 40 |
static long scanbufsiz; /* size of allocated scanline buffer */ |
| 41 |
|
| 42 |
static long ncall = 0L; /* number of calls to getpictscan */ |
| 43 |
static long nread = 0L; /* number of scanlines read */ |
| 44 |
static long nrecl = 0L; /* number of scanlines reclaimed */ |
| 45 |
|
| 46 |
static int wrongformat = 0; |
| 47 |
|
| 48 |
SCAN *scanretire(); |
| 49 |
|
| 50 |
extern long ftell(); |
| 51 |
|
| 52 |
|
| 53 |
SCAN * |
| 54 |
claimscan(y) /* claim scanline from buffers */ |
| 55 |
int y; |
| 56 |
{ |
| 57 |
int hi = shash(y); |
| 58 |
SCAN *slast; |
| 59 |
register SCAN *sl; |
| 60 |
|
| 61 |
for (sl = hashtab[hi]; sl != NULL; sl = sl->next) |
| 62 |
if (sl->y == y) /* active scanline */ |
| 63 |
return(sl); |
| 64 |
for (slast = NULL, sl = freelist; sl != NULL; slast = sl, sl = sl->next) |
| 65 |
if (sl->y == -1 || sl->y == y || sl->next == NULL) { |
| 66 |
if (slast == NULL) /* remove from free */ |
| 67 |
freelist = sl->next; |
| 68 |
else |
| 69 |
slast->next = sl->next; |
| 70 |
if (sl->y == y) { /* reclaim */ |
| 71 |
sl->next = hashtab[hi]; |
| 72 |
hashtab[hi] = sl; |
| 73 |
nrecl++; |
| 74 |
} |
| 75 |
return(sl); |
| 76 |
} |
| 77 |
return(scanretire()); /* need more free scanlines */ |
| 78 |
} |
| 79 |
|
| 80 |
|
| 81 |
COLR * |
| 82 |
getpictscan(y) /* get picture scanline */ |
| 83 |
int y; |
| 84 |
{ |
| 85 |
register SCAN *sl; |
| 86 |
register int i; |
| 87 |
/* first check our buffers */ |
| 88 |
sl = claimscan(y); |
| 89 |
if (sl == NULL) |
| 90 |
memerr("claimscan()"); |
| 91 |
sl->lused = ncall++; |
| 92 |
if (sl->y == y) /* scan hit */ |
| 93 |
return(scandata(sl)); |
| 94 |
/* else read in replacement */ |
| 95 |
if (scanpos[y] < 0) { /* need to search */ |
| 96 |
for (i = y+1; i < curpos; i++) |
| 97 |
if (scanpos[i] >= 0) { |
| 98 |
if (fseek(pictfp, scanpos[i], 0) < 0) |
| 99 |
goto seekerr; |
| 100 |
curpos = i; |
| 101 |
break; |
| 102 |
} |
| 103 |
while (curpos >= y) { |
| 104 |
scanpos[curpos] = ftell(pictfp); |
| 105 |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
| 106 |
goto readerr; |
| 107 |
nread++; |
| 108 |
curpos--; |
| 109 |
} |
| 110 |
} else { |
| 111 |
if (curpos != y && fseek(pictfp, scanpos[y], 0) < 0) |
| 112 |
goto seekerr; |
| 113 |
if (freadcolrs(scandata(sl), pxsiz, pictfp) < 0) |
| 114 |
goto readerr; |
| 115 |
nread++; |
| 116 |
curpos = y-1; |
| 117 |
} |
| 118 |
sl->y = y; |
| 119 |
i = shash(y); /* add to hash list */ |
| 120 |
sl->next = hashtab[i]; |
| 121 |
hashtab[i] = sl; |
| 122 |
return(scandata(sl)); |
| 123 |
readerr: |
| 124 |
fprintf(stderr, "%s: picture read error\n", progname); |
| 125 |
exit(1); |
| 126 |
seekerr: |
| 127 |
fprintf(stderr, "%s: picture seek error\n", progname); |
| 128 |
exit(1); |
| 129 |
} |
| 130 |
|
| 131 |
|
| 132 |
#ifdef DEBUG |
| 133 |
pict_stats() /* print out picture read statistics */ |
| 134 |
{ |
| 135 |
static long lastcall = 0L; /* ncall at last report */ |
| 136 |
static long lastread = 0L; /* nread at last report */ |
| 137 |
static long lastrecl = 0L; /* nrecl at last report */ |
| 138 |
|
| 139 |
if (ncall == lastcall) |
| 140 |
return; |
| 141 |
fprintf(stderr, "%s: %ld scanlines read (%ld reclaimed) in %ld calls\n", |
| 142 |
progname, nread-lastread, nrecl-lastrecl, ncall-lastcall); |
| 143 |
lastcall = ncall; |
| 144 |
lastread = nread; |
| 145 |
lastrecl = nrecl; |
| 146 |
} |
| 147 |
#endif |
| 148 |
|
| 149 |
|
| 150 |
double |
| 151 |
pict_val(vd) /* find picture value for view direction */ |
| 152 |
FVECT vd; |
| 153 |
{ |
| 154 |
FVECT pp; |
| 155 |
FVECT ip; |
| 156 |
COLOR res; |
| 157 |
|
| 158 |
if (pictfp == NULL) |
| 159 |
return(-1.0); |
| 160 |
pp[0] = pictview.vp[0] + vd[0]; |
| 161 |
pp[1] = pictview.vp[1] + vd[1]; |
| 162 |
pp[2] = pictview.vp[2] + vd[2]; |
| 163 |
viewloc(ip, &pictview, pp); |
| 164 |
if (ip[2] <= FTINY || ip[0] < 0. || ip[0] >= 1. || |
| 165 |
ip[1] < 0. || ip[1] >= 1.) |
| 166 |
return(-1.0); |
| 167 |
colr_color(res, getpictscan((int)(ip[1]*pysiz))[(int)(ip[0]*pxsiz)]); |
| 168 |
return(luminance(res)/exposure); |
| 169 |
} |
| 170 |
|
| 171 |
|
| 172 |
double |
| 173 |
getviewpix(vh, vv) /* compute single view pixel */ |
| 174 |
int vh, vv; |
| 175 |
{ |
| 176 |
FVECT dir; |
| 177 |
float rt_buf[12]; |
| 178 |
double res; |
| 179 |
|
| 180 |
if (compdir(dir, vh, vv) < 0) |
| 181 |
return(-1.0); |
| 182 |
npixinvw++; |
| 183 |
if ((res = pict_val(dir)) >= 0.0) |
| 184 |
return(res); |
| 185 |
if (rt_pd[0] == -1) { |
| 186 |
npixmiss++; |
| 187 |
return(-1.0); |
| 188 |
} |
| 189 |
rt_buf[0] = ourview.vp[0]; |
| 190 |
rt_buf[1] = ourview.vp[1]; |
| 191 |
rt_buf[2] = ourview.vp[2]; |
| 192 |
rt_buf[3] = dir[0]; |
| 193 |
rt_buf[4] = dir[1]; |
| 194 |
rt_buf[5] = dir[2]; |
| 195 |
rt_compute(rt_buf, 1); |
| 196 |
return(luminance(rt_buf)); |
| 197 |
} |
| 198 |
|
| 199 |
|
| 200 |
getviewspan(vv, vb) /* compute a span of view pixels */ |
| 201 |
int vv; |
| 202 |
float *vb; |
| 203 |
{ |
| 204 |
float rt_buf[6*MAXPIX]; /* rtrace send/receive buffer */ |
| 205 |
register int n; /* number of pixels in buffer */ |
| 206 |
short buf_vh[MAXPIX]; /* pixel positions */ |
| 207 |
FVECT dir; |
| 208 |
register int vh; |
| 209 |
|
| 210 |
#ifdef DEBUG |
| 211 |
if (verbose) |
| 212 |
fprintf(stderr, "%s: computing view span at %d...\n", |
| 213 |
progname, vv); |
| 214 |
#endif |
| 215 |
n = 0; |
| 216 |
for (vh = -hsize; vh <= hsize; vh++) { |
| 217 |
if (compdir(dir, vh, vv) < 0) { /* not in view */ |
| 218 |
vb[vh+hsize] = -1.0; |
| 219 |
continue; |
| 220 |
} |
| 221 |
npixinvw++; |
| 222 |
if ((vb[vh+hsize] = pict_val(dir)) >= 0.0) |
| 223 |
continue; |
| 224 |
if (rt_pd[0] == -1) { /* missing information */ |
| 225 |
npixmiss++; |
| 226 |
continue; |
| 227 |
} |
| 228 |
/* send to rtrace */ |
| 229 |
if (n >= maxpix) { /* flush */ |
| 230 |
rt_compute(rt_buf, n); |
| 231 |
while (n-- > 0) |
| 232 |
vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
| 233 |
} |
| 234 |
rt_buf[6*n] = ourview.vp[0]; |
| 235 |
rt_buf[6*n+1] = ourview.vp[1]; |
| 236 |
rt_buf[6*n+2] = ourview.vp[2]; |
| 237 |
rt_buf[6*n+3] = dir[0]; |
| 238 |
rt_buf[6*n+4] = dir[1]; |
| 239 |
rt_buf[6*n+5] = dir[2]; |
| 240 |
buf_vh[n++] = vh; |
| 241 |
} |
| 242 |
#ifdef DEBUG |
| 243 |
if (verbose) |
| 244 |
pict_stats(); |
| 245 |
#endif |
| 246 |
if (n > 0) { /* process pending buffer */ |
| 247 |
rt_compute(rt_buf, n); |
| 248 |
while (n-- > 0) |
| 249 |
vb[buf_vh[n]+hsize] = luminance(rt_buf+3*n); |
| 250 |
} |
| 251 |
} |
| 252 |
|
| 253 |
|
| 254 |
rt_compute(pb, np) /* process buffer through rtrace */ |
| 255 |
float *pb; |
| 256 |
int np; |
| 257 |
{ |
| 258 |
#ifdef DEBUG |
| 259 |
if (verbose && np > 1) |
| 260 |
fprintf(stderr, "%s: sending %d samples to rtrace...\n", |
| 261 |
progname, np); |
| 262 |
#endif |
| 263 |
bzero(pb+6*np, 6*sizeof(float)); |
| 264 |
if (process(rt_pd, (char *)pb, (char *)pb, 3*sizeof(float)*(np+1), |
| 265 |
6*sizeof(float)*(np+1)) < 3*sizeof(float)*(np+1)) { |
| 266 |
fprintf(stderr, "%s: rtrace communication error\n", |
| 267 |
progname); |
| 268 |
exit(1); |
| 269 |
} |
| 270 |
} |
| 271 |
|
| 272 |
|
| 273 |
int |
| 274 |
getexpos(s) /* get exposure from header line */ |
| 275 |
char *s; |
| 276 |
{ |
| 277 |
char fmt[32]; |
| 278 |
|
| 279 |
if (isexpos(s)) |
| 280 |
exposure *= exposval(s); |
| 281 |
else if (isformat(s)) { |
| 282 |
formatval(fmt, s); |
| 283 |
wrongformat = strcmp(fmt, COLRFMT); |
| 284 |
} |
| 285 |
return(0); |
| 286 |
} |
| 287 |
|
| 288 |
|
| 289 |
open_pict(fn) /* open picture file */ |
| 290 |
char *fn; |
| 291 |
{ |
| 292 |
if ((pictfp = fopen(fn, "r")) == NULL) { |
| 293 |
fprintf(stderr, "%s: cannot open\n", fn); |
| 294 |
exit(1); |
| 295 |
} |
| 296 |
exposure = 1.0; |
| 297 |
getheader(pictfp, getexpos, NULL); |
| 298 |
if (wrongformat || !fscnresolu(&pxsiz, &pysiz, pictfp)) { |
| 299 |
fprintf(stderr, "%s: incompatible picture format\n", fn); |
| 300 |
exit(1); |
| 301 |
} |
| 302 |
initscans(); |
| 303 |
} |
| 304 |
|
| 305 |
|
| 306 |
close_pict() /* done with picture */ |
| 307 |
{ |
| 308 |
if (pictfp == NULL) |
| 309 |
return; |
| 310 |
fclose(pictfp); |
| 311 |
donescans(); |
| 312 |
pictfp = NULL; |
| 313 |
} |
| 314 |
|
| 315 |
|
| 316 |
fork_rtrace(av) /* open pipe and start rtrace */ |
| 317 |
char *av[]; |
| 318 |
{ |
| 319 |
int rval; |
| 320 |
|
| 321 |
rval = open_process(rt_pd, av); |
| 322 |
if (rval < 0) { |
| 323 |
perror(progname); |
| 324 |
exit(1); |
| 325 |
} |
| 326 |
if (rval == 0) { |
| 327 |
fprintf(stderr, "%s: command not found\n", av[0]); |
| 328 |
exit(1); |
| 329 |
} |
| 330 |
maxpix = rval/(6*sizeof(float)); |
| 331 |
if (maxpix > MAXPIX) |
| 332 |
maxpix = MAXPIX; |
| 333 |
maxpix--; |
| 334 |
} |
| 335 |
|
| 336 |
|
| 337 |
done_rtrace() /* wait for rtrace to finish */ |
| 338 |
{ |
| 339 |
int status; |
| 340 |
|
| 341 |
status = close_process(rt_pd); |
| 342 |
if (status > 0) { |
| 343 |
fprintf(stderr, "%s: bad status (%d) from rtrace\n", |
| 344 |
progname, status); |
| 345 |
exit(1); |
| 346 |
} |
| 347 |
rt_pd[0] = -1; |
| 348 |
} |
| 349 |
|
| 350 |
|
| 351 |
SCAN * |
| 352 |
scanretire() /* retire old scanlines to free list */ |
| 353 |
{ |
| 354 |
SCAN *sold[NRETIRE]; |
| 355 |
int n; |
| 356 |
int h; |
| 357 |
register SCAN *sl; |
| 358 |
register int i; |
| 359 |
/* grab the NRETIRE oldest scanlines */ |
| 360 |
sold[n = 0] = NULL; |
| 361 |
for (h = 0; h < HSIZE; h++) |
| 362 |
for (sl = hashtab[h]; sl != NULL; sl = sl->next) { |
| 363 |
for (i = n; i && sold[i-1]->lused > sl->lused; i--) |
| 364 |
if (i < NRETIRE) |
| 365 |
sold[i] = sold[i-1]; |
| 366 |
if (i < NRETIRE) { |
| 367 |
sold[i] = sl; |
| 368 |
if (n < NRETIRE) /* grow list */ |
| 369 |
n++; |
| 370 |
} |
| 371 |
} |
| 372 |
/* put scanlines into free list */ |
| 373 |
for (i = 0; i < n; i++) { |
| 374 |
h = shash(sold[i]->y); |
| 375 |
sl = hashtab[h]; |
| 376 |
if (sl == sold[i]) |
| 377 |
hashtab[h] = sl->next; |
| 378 |
else { |
| 379 |
while (sl->next != sold[i]) /* IS in list */ |
| 380 |
sl = sl->next; |
| 381 |
sl->next = sold[i]->next; |
| 382 |
} |
| 383 |
if (i > 0) { /* save oldest as return value */ |
| 384 |
sold[i]->next = freelist; |
| 385 |
freelist = sold[i]; |
| 386 |
} |
| 387 |
} |
| 388 |
return(sold[0]); |
| 389 |
} |
| 390 |
|
| 391 |
|
| 392 |
static char *scan_buf; |
| 393 |
|
| 394 |
|
| 395 |
initscans() /* initialize scanline buffers */ |
| 396 |
{ |
| 397 |
int scansize; |
| 398 |
register SCAN *ptr; |
| 399 |
register int i; |
| 400 |
/* initialize positions */ |
| 401 |
scanpos = (long *)bmalloc(pysiz*sizeof(long)); |
| 402 |
if (scanpos == NULL) |
| 403 |
memerr("scanline positions"); |
| 404 |
for (i = pysiz-1; i >= 0; i--) |
| 405 |
scanpos[i] = -1L; |
| 406 |
curpos = pysiz-1; |
| 407 |
/* clear hash table */ |
| 408 |
for (i = 0; i < HSIZE; i++) |
| 409 |
hashtab[i] = NULL; |
| 410 |
/* allocate scanline buffers */ |
| 411 |
scansize = sizeof(SCAN) + pxsiz*sizeof(COLR); |
| 412 |
#ifdef ALIGN |
| 413 |
scansize = scansize+(sizeof(ALIGN)-1) & ~(sizeof(ALIGN)-1); |
| 414 |
#endif |
| 415 |
i = MAXSBUF / scansize; /* compute number to allocate */ |
| 416 |
if (i > HSIZE) |
| 417 |
i = HSIZE; |
| 418 |
scanbufsiz = i*scansize; |
| 419 |
scan_buf = bmalloc(scanbufsiz); /* get in one big chunk */ |
| 420 |
if (scan_buf == NULL) |
| 421 |
memerr("scanline buffers"); |
| 422 |
ptr = (SCAN *)scan_buf; |
| 423 |
freelist = NULL; /* build our free list */ |
| 424 |
while (i-- > 0) { |
| 425 |
ptr->y = -1; |
| 426 |
ptr->lused = -1; |
| 427 |
ptr->next = freelist; |
| 428 |
freelist = ptr; |
| 429 |
ptr = (SCAN *)((char *)ptr + scansize); /* beware of C bugs */ |
| 430 |
} |
| 431 |
} |
| 432 |
|
| 433 |
|
| 434 |
donescans() /* free up scanlines */ |
| 435 |
{ |
| 436 |
bfree(scan_buf, scanbufsiz); |
| 437 |
bfree((char *)scanpos, pysiz*sizeof(long)); |
| 438 |
} |
