1 |
#ifndef lint |
2 |
static const char RCSid[] = "$Id"; |
3 |
#endif |
4 |
/* |
5 |
* rpict.c - routines and variables for picture generation. |
6 |
*/ |
7 |
|
8 |
#include "copyright.h" |
9 |
|
10 |
#include "ray.h" |
11 |
|
12 |
#include <sys/types.h> |
13 |
|
14 |
#ifndef NIX |
15 |
#ifdef BSD |
16 |
#include <sys/time.h> |
17 |
#include <sys/resource.h> |
18 |
#else |
19 |
#include <sys/times.h> |
20 |
#include <unistd.h> |
21 |
#endif |
22 |
#endif |
23 |
|
24 |
#include <time.h> |
25 |
#include <signal.h> |
26 |
|
27 |
#include "platform.h" |
28 |
#include "view.h" |
29 |
#include "random.h" |
30 |
#include "paths.h" |
31 |
|
32 |
|
33 |
#define RFTEMPLATE "rfXXXXXX" |
34 |
|
35 |
#ifndef SIGCONT |
36 |
#define SIGCONT SIGIO |
37 |
#endif |
38 |
|
39 |
CUBE thescene; /* our scene */ |
40 |
OBJECT nsceneobjs; /* number of objects in our scene */ |
41 |
|
42 |
int dimlist[MAXDIM]; /* sampling dimensions */ |
43 |
int ndims = 0; /* number of sampling dimensions */ |
44 |
int samplendx; /* sample index number */ |
45 |
|
46 |
extern void ambnotify(); |
47 |
void (*addobjnotify[])() = {ambnotify, NULL}; |
48 |
|
49 |
VIEW ourview = STDVIEW; /* view parameters */ |
50 |
int hresolu = 512; /* horizontal resolution */ |
51 |
int vresolu = 512; /* vertical resolution */ |
52 |
double pixaspect = 1.0; /* pixel aspect ratio */ |
53 |
|
54 |
int psample = 4; /* pixel sample size */ |
55 |
double maxdiff = .05; /* max. difference for interpolation */ |
56 |
double dstrpix = 0.67; /* square pixel distribution */ |
57 |
|
58 |
double mblur = 0.; /* motion blur parameter */ |
59 |
|
60 |
void (*trace)() = NULL; /* trace call */ |
61 |
|
62 |
int do_irrad = 0; /* compute irradiance? */ |
63 |
|
64 |
double dstrsrc = 0.0; /* square source distribution */ |
65 |
double shadthresh = .05; /* shadow threshold */ |
66 |
double shadcert = .5; /* shadow certainty */ |
67 |
int directrelay = 1; /* number of source relays */ |
68 |
int vspretest = 512; /* virtual source pretest density */ |
69 |
int directvis = 1; /* sources visible? */ |
70 |
double srcsizerat = .25; /* maximum ratio source size/dist. */ |
71 |
|
72 |
COLOR cextinction = BLKCOLOR; /* global extinction coefficient */ |
73 |
COLOR salbedo = BLKCOLOR; /* global scattering albedo */ |
74 |
double seccg = 0.; /* global scattering eccentricity */ |
75 |
double ssampdist = 0.; /* scatter sampling distance */ |
76 |
|
77 |
double specthresh = .15; /* specular sampling threshold */ |
78 |
double specjitter = 1.; /* specular sampling jitter */ |
79 |
|
80 |
int backvis = 1; /* back face visibility */ |
81 |
|
82 |
int maxdepth = 6; /* maximum recursion depth */ |
83 |
double minweight = 5e-3; /* minimum ray weight */ |
84 |
|
85 |
char *ambfile = NULL; /* ambient file name */ |
86 |
COLOR ambval = BLKCOLOR; /* ambient value */ |
87 |
int ambvwt = 0; /* initial weight for ambient value */ |
88 |
double ambacc = 0.2; /* ambient accuracy */ |
89 |
int ambres = 32; /* ambient resolution */ |
90 |
int ambdiv = 128; /* ambient divisions */ |
91 |
int ambssamp = 0; /* ambient super-samples */ |
92 |
int ambounce = 0; /* ambient bounces */ |
93 |
char *amblist[128]; /* ambient include/exclude list */ |
94 |
int ambincl = -1; /* include == 1, exclude == 0 */ |
95 |
|
96 |
int ralrm = 0; /* seconds between reports */ |
97 |
|
98 |
double pctdone = 0.0; /* percentage done */ |
99 |
time_t tlastrept = 0L; /* time at last report */ |
100 |
time_t tstart; /* starting time */ |
101 |
|
102 |
#define MAXDIV 16 /* maximum sample size */ |
103 |
|
104 |
#define pixjitter() (.5+dstrpix*(.5-frandom())) |
105 |
|
106 |
int hres, vres; /* resolution for this frame */ |
107 |
|
108 |
static VIEW lastview; /* the previous view input */ |
109 |
|
110 |
extern char *mktemp(); /* XXX should be in stdlib.h or unistd.h */ |
111 |
|
112 |
void report(); |
113 |
|
114 |
double pixvalue(); |
115 |
|
116 |
#ifdef NIX |
117 |
#define file_exists(f) (access(f,F_OK)==0) |
118 |
#else |
119 |
#include <sys/types.h> |
120 |
#include <sys/stat.h> |
121 |
int |
122 |
file_exists(fname) /* ordinary file exists? */ |
123 |
char *fname; |
124 |
{ |
125 |
struct stat sbuf; |
126 |
if (stat(fname, &sbuf) < 0) return(0); |
127 |
return((sbuf.st_mode & S_IFREG) != 0); |
128 |
} |
129 |
#endif |
130 |
|
131 |
|
132 |
void |
133 |
quit(code) /* quit program */ |
134 |
int code; |
135 |
{ |
136 |
if (code) /* report status */ |
137 |
report(); |
138 |
#ifndef NIX |
139 |
headclean(); /* delete header file */ |
140 |
pfclean(); /* clean up persist files */ |
141 |
#endif |
142 |
exit(code); |
143 |
} |
144 |
|
145 |
|
146 |
#ifndef NIX |
147 |
void |
148 |
report() /* report progress */ |
149 |
{ |
150 |
extern char *myhostname(); |
151 |
double u, s; |
152 |
#ifdef BSD |
153 |
struct rusage rubuf; |
154 |
#else |
155 |
struct tms tbuf; |
156 |
double period; |
157 |
#endif |
158 |
|
159 |
tlastrept = time((time_t *)NULL); |
160 |
#ifdef BSD |
161 |
getrusage(RUSAGE_SELF, &rubuf); |
162 |
u = rubuf.ru_utime.tv_sec + rubuf.ru_utime.tv_usec/1e6; |
163 |
s = rubuf.ru_stime.tv_sec + rubuf.ru_stime.tv_usec/1e6; |
164 |
getrusage(RUSAGE_CHILDREN, &rubuf); |
165 |
u += rubuf.ru_utime.tv_sec + rubuf.ru_utime.tv_usec/1e6; |
166 |
s += rubuf.ru_stime.tv_sec + rubuf.ru_stime.tv_usec/1e6; |
167 |
#else |
168 |
times(&tbuf); |
169 |
#ifdef _SC_CLK_TCK |
170 |
period = 1.0 / sysconf(_SC_CLK_TCK); |
171 |
#else |
172 |
period = 1.0 / 60.0; |
173 |
#endif |
174 |
u = ( tbuf.tms_utime + tbuf.tms_cutime ) * period; |
175 |
s = ( tbuf.tms_stime + tbuf.tms_cstime ) * period; |
176 |
#endif |
177 |
|
178 |
sprintf(errmsg, |
179 |
"%lu rays, %4.2f%% after %.3fu %.3fs %.3fr hours on %s\n", |
180 |
nrays, pctdone, u/3600., s/3600., |
181 |
(tlastrept-tstart)/3600., myhostname()); |
182 |
eputs(errmsg); |
183 |
#ifndef BSD |
184 |
signal(SIGCONT, report); |
185 |
#endif |
186 |
} |
187 |
#else |
188 |
void |
189 |
report() /* report progress */ |
190 |
{ |
191 |
tlastrept = time((time_t *)NULL); |
192 |
sprintf(errmsg, "%lu rays, %4.2f%% after %5.4f hours\n", |
193 |
nrays, pctdone, (tlastrept-tstart)/3600.0); |
194 |
eputs(errmsg); |
195 |
} |
196 |
#endif |
197 |
|
198 |
|
199 |
void |
200 |
rpict(seq, pout, zout, prvr) /* generate image(s) */ |
201 |
int seq; |
202 |
char *pout, *zout, *prvr; |
203 |
/* |
204 |
* If seq is greater than zero, then we will render a sequence of |
205 |
* images based on view parameter strings read from the standard input. |
206 |
* If pout is NULL, then all images will be sent to the standard ouput. |
207 |
* If seq is greater than zero and prvr is an integer, then it is the |
208 |
* frame number at which rendering should begin. Preceeding view parameter |
209 |
* strings will be skipped in the input. |
210 |
* If pout and prvr are the same, prvr is renamed to avoid overwriting. |
211 |
* Note that pout and zout should contain %d format specifications for |
212 |
* sequenced file naming. |
213 |
*/ |
214 |
{ |
215 |
char fbuf[128], fbuf2[128]; |
216 |
int npicts; |
217 |
register char *cp; |
218 |
RESOLU rs; |
219 |
double pa; |
220 |
/* check sampling */ |
221 |
if (psample < 1) |
222 |
psample = 1; |
223 |
else if (psample > MAXDIV) { |
224 |
sprintf(errmsg, "pixel sampling reduced from %d to %d", |
225 |
psample, MAXDIV); |
226 |
error(WARNING, errmsg); |
227 |
psample = MAXDIV; |
228 |
} |
229 |
/* get starting frame */ |
230 |
if (seq <= 0) |
231 |
seq = 0; |
232 |
else if (prvr != NULL && isint(prvr)) { |
233 |
register int rn; /* skip to specified view */ |
234 |
if ((rn = atoi(prvr)) < seq) |
235 |
error(USER, "recover frame less than start frame"); |
236 |
if (pout == NULL) |
237 |
error(USER, "missing output file specification"); |
238 |
for ( ; seq < rn; seq++) |
239 |
if (nextview(stdin) == EOF) |
240 |
error(USER, "unexpected EOF on view input"); |
241 |
setview(&ourview); |
242 |
prvr = fbuf; /* mark for renaming */ |
243 |
} |
244 |
if (pout != NULL & prvr != NULL) { |
245 |
sprintf(fbuf, pout, seq); |
246 |
if (!strcmp(prvr, fbuf)) { /* rename */ |
247 |
strcpy(fbuf2, fbuf); |
248 |
for (cp = fbuf2; *cp; cp++) |
249 |
; |
250 |
while (cp > fbuf2 && !ISDIRSEP(cp[-1])) |
251 |
cp--; |
252 |
strcpy(cp, RFTEMPLATE); |
253 |
prvr = mktemp(fbuf2); |
254 |
if (rename(fbuf, prvr) < 0) |
255 |
if (errno == ENOENT) { /* ghost file */ |
256 |
sprintf(errmsg, |
257 |
"new output file \"%s\"", |
258 |
fbuf); |
259 |
error(WARNING, errmsg); |
260 |
prvr = NULL; |
261 |
} else { /* serious error */ |
262 |
sprintf(errmsg, |
263 |
"cannot rename \"%s\" to \"%s\"", |
264 |
fbuf, prvr); |
265 |
error(SYSTEM, errmsg); |
266 |
} |
267 |
} |
268 |
} |
269 |
npicts = 0; /* render sequence */ |
270 |
do { |
271 |
if (seq && nextview(stdin) == EOF) |
272 |
break; |
273 |
pctdone = 0.0; |
274 |
if (pout != NULL) { |
275 |
sprintf(fbuf, pout, seq); |
276 |
if (file_exists(fbuf)) { |
277 |
if (prvr != NULL || !strcmp(fbuf, pout)) { |
278 |
sprintf(errmsg, |
279 |
"output file \"%s\" exists", |
280 |
fbuf); |
281 |
error(USER, errmsg); |
282 |
} |
283 |
setview(&ourview); |
284 |
continue; /* don't clobber */ |
285 |
} |
286 |
if (freopen(fbuf, "w", stdout) == NULL) { |
287 |
sprintf(errmsg, |
288 |
"cannot open output file \"%s\"", fbuf); |
289 |
error(SYSTEM, errmsg); |
290 |
} |
291 |
SET_FILE_BINARY(stdout); |
292 |
dupheader(); |
293 |
} |
294 |
hres = hresolu; vres = vresolu; pa = pixaspect; |
295 |
if (prvr != NULL) |
296 |
if (viewfile(prvr, &ourview, &rs) <= 0 |
297 |
|| rs.rt != PIXSTANDARD) { |
298 |
sprintf(errmsg, |
299 |
"cannot recover view parameters from \"%s\"", prvr); |
300 |
error(WARNING, errmsg); |
301 |
} else { |
302 |
pa = 0.0; |
303 |
hres = scanlen(&rs); |
304 |
vres = numscans(&rs); |
305 |
} |
306 |
if ((cp = setview(&ourview)) != NULL) |
307 |
error(USER, cp); |
308 |
normaspect(viewaspect(&ourview), &pa, &hres, &vres); |
309 |
if (seq) { |
310 |
if (ralrm > 0) { |
311 |
fprintf(stderr, "FRAME %d:", seq); |
312 |
fprintview(&ourview, stderr); |
313 |
putc('\n', stderr); |
314 |
fflush(stderr); |
315 |
} |
316 |
printf("FRAME=%d\n", seq); |
317 |
} |
318 |
fputs(VIEWSTR, stdout); |
319 |
fprintview(&ourview, stdout); |
320 |
putchar('\n'); |
321 |
if (pa < .99 || pa > 1.01) |
322 |
fputaspect(pa, stdout); |
323 |
fputformat(COLRFMT, stdout); |
324 |
putchar('\n'); |
325 |
if (zout != NULL) |
326 |
sprintf(cp=fbuf, zout, seq); |
327 |
else |
328 |
cp = NULL; |
329 |
render(cp, prvr); |
330 |
prvr = NULL; |
331 |
npicts++; |
332 |
} while (seq++); |
333 |
/* check that we did something */ |
334 |
if (npicts == 0) |
335 |
error(WARNING, "no output produced"); |
336 |
} |
337 |
|
338 |
|
339 |
nextview(fp) /* get next view from fp */ |
340 |
FILE *fp; |
341 |
{ |
342 |
char linebuf[256]; |
343 |
|
344 |
copystruct(&lastview, &ourview); |
345 |
while (fgets(linebuf, sizeof(linebuf), fp) != NULL) |
346 |
if (isview(linebuf) && sscanview(&ourview, linebuf) > 0) |
347 |
return(0); |
348 |
return(EOF); |
349 |
} |
350 |
|
351 |
|
352 |
render(zfile, oldfile) /* render the scene */ |
353 |
char *zfile, *oldfile; |
354 |
{ |
355 |
COLOR *scanbar[MAXDIV+1]; /* scanline arrays of pixel values */ |
356 |
float *zbar[MAXDIV+1]; /* z values */ |
357 |
char *sampdens; /* previous sample density */ |
358 |
int ypos; /* current scanline */ |
359 |
int ystep; /* current y step size */ |
360 |
int hstep; /* h step size */ |
361 |
int zfd; |
362 |
COLOR *colptr; |
363 |
float *zptr; |
364 |
register int i; |
365 |
/* check for empty image */ |
366 |
if (hres <= 0 || vres <= 0) { |
367 |
error(WARNING, "empty output picture"); |
368 |
fprtresolu(0, 0, stdout); |
369 |
return; |
370 |
} |
371 |
/* allocate scanlines */ |
372 |
for (i = 0; i <= psample; i++) { |
373 |
scanbar[i] = (COLOR *)malloc(hres*sizeof(COLOR)); |
374 |
if (scanbar[i] == NULL) |
375 |
goto memerr; |
376 |
} |
377 |
hstep = (psample*140+49)/99; /* quincunx sampling */ |
378 |
ystep = (psample*99+70)/140; |
379 |
if (hstep > 2) { |
380 |
i = hres/hstep + 2; |
381 |
if ((sampdens = (char *)malloc(i)) == NULL) |
382 |
goto memerr; |
383 |
while (i--) |
384 |
sampdens[i] = hstep; |
385 |
} else |
386 |
sampdens = NULL; |
387 |
/* open z-file */ |
388 |
if (zfile != NULL) { |
389 |
if ((zfd = open(zfile, O_WRONLY|O_CREAT, 0666)) == -1) { |
390 |
sprintf(errmsg, "cannot open z-file \"%s\"", zfile); |
391 |
error(SYSTEM, errmsg); |
392 |
} |
393 |
SET_FD_BINARY(zfd); |
394 |
for (i = 0; i <= psample; i++) { |
395 |
zbar[i] = (float *)malloc(hres*sizeof(float)); |
396 |
if (zbar[i] == NULL) |
397 |
goto memerr; |
398 |
} |
399 |
} else { |
400 |
zfd = -1; |
401 |
for (i = 0; i <= psample; i++) |
402 |
zbar[i] = NULL; |
403 |
} |
404 |
/* write out boundaries */ |
405 |
fprtresolu(hres, vres, stdout); |
406 |
/* recover file and compute first */ |
407 |
i = salvage(oldfile); |
408 |
if (i >= vres) |
409 |
goto alldone; |
410 |
if (zfd != -1 && i > 0 && |
411 |
lseek(zfd, (off_t)i*hres*sizeof(float), 0) < 0) |
412 |
error(SYSTEM, "z-file seek error in render"); |
413 |
pctdone = 100.0*i/vres; |
414 |
if (ralrm > 0) /* report init stats */ |
415 |
report(); |
416 |
#ifndef BSD |
417 |
else |
418 |
#endif |
419 |
signal(SIGCONT, report); |
420 |
ypos = vres-1 - i; /* initialize sampling */ |
421 |
if (directvis) |
422 |
init_drawsources(psample); |
423 |
fillscanline(scanbar[0], zbar[0], sampdens, hres, ypos, hstep); |
424 |
/* compute scanlines */ |
425 |
for (ypos -= ystep; ypos > -ystep; ypos -= ystep) { |
426 |
/* bottom adjust? */ |
427 |
if (ypos < 0) { |
428 |
ystep += ypos; |
429 |
ypos = 0; |
430 |
} |
431 |
colptr = scanbar[ystep]; /* move base to top */ |
432 |
scanbar[ystep] = scanbar[0]; |
433 |
scanbar[0] = colptr; |
434 |
zptr = zbar[ystep]; |
435 |
zbar[ystep] = zbar[0]; |
436 |
zbar[0] = zptr; |
437 |
/* fill base line */ |
438 |
fillscanline(scanbar[0], zbar[0], sampdens, |
439 |
hres, ypos, hstep); |
440 |
/* fill bar */ |
441 |
fillscanbar(scanbar, zbar, hres, ypos, ystep); |
442 |
if (directvis) /* add bitty sources */ |
443 |
drawsources(scanbar, zbar, 0, hres, ypos, ystep); |
444 |
/* write it out */ |
445 |
#ifndef BSD |
446 |
signal(SIGCONT, SIG_IGN); /* don't interrupt writes */ |
447 |
#endif |
448 |
for (i = ystep; i > 0; i--) { |
449 |
if (zfd != -1 && write(zfd, (char *)zbar[i], |
450 |
hres*sizeof(float)) |
451 |
< hres*sizeof(float)) |
452 |
goto writerr; |
453 |
if (fwritescan(scanbar[i], hres, stdout) < 0) |
454 |
goto writerr; |
455 |
} |
456 |
if (fflush(stdout) == EOF) |
457 |
goto writerr; |
458 |
/* record progress */ |
459 |
pctdone = 100.0*(vres-1-ypos)/vres; |
460 |
if (ralrm > 0 && time((time_t *)NULL) >= tlastrept+ralrm) |
461 |
report(); |
462 |
#ifndef BSD |
463 |
else |
464 |
signal(SIGCONT, report); |
465 |
#endif |
466 |
} |
467 |
/* clean up */ |
468 |
signal(SIGCONT, SIG_IGN); |
469 |
if (zfd != -1 && write(zfd, (char *)zbar[0], hres*sizeof(float)) |
470 |
< hres*sizeof(float)) |
471 |
goto writerr; |
472 |
fwritescan(scanbar[0], hres, stdout); |
473 |
if (fflush(stdout) == EOF) |
474 |
goto writerr; |
475 |
alldone: |
476 |
if (zfd != -1) { |
477 |
if (close(zfd) == -1) |
478 |
goto writerr; |
479 |
for (i = 0; i <= psample; i++) |
480 |
free((void *)zbar[i]); |
481 |
} |
482 |
for (i = 0; i <= psample; i++) |
483 |
free((void *)scanbar[i]); |
484 |
if (sampdens != NULL) |
485 |
free(sampdens); |
486 |
pctdone = 100.0; |
487 |
if (ralrm > 0) |
488 |
report(); |
489 |
signal(SIGCONT, SIG_DFL); |
490 |
return; |
491 |
writerr: |
492 |
error(SYSTEM, "write error in render"); |
493 |
memerr: |
494 |
error(SYSTEM, "out of memory in render"); |
495 |
} |
496 |
|
497 |
|
498 |
fillscanline(scanline, zline, sd, xres, y, xstep) /* fill scan at y */ |
499 |
register COLOR *scanline; |
500 |
register float *zline; |
501 |
register char *sd; |
502 |
int xres, y, xstep; |
503 |
{ |
504 |
static int nc = 0; /* number of calls */ |
505 |
int bl = xstep, b = xstep; |
506 |
double z; |
507 |
register int i; |
508 |
|
509 |
z = pixvalue(scanline[0], 0, y); |
510 |
if (zline) zline[0] = z; |
511 |
/* zig-zag start for quincunx pattern */ |
512 |
for (i = ++nc & 1 ? xstep : xstep/2; i < xres-1+xstep; i += xstep) { |
513 |
if (i >= xres) { |
514 |
xstep += xres-1-i; |
515 |
i = xres-1; |
516 |
} |
517 |
z = pixvalue(scanline[i], i, y); |
518 |
if (zline) zline[i] = z; |
519 |
if (sd) b = sd[0] > sd[1] ? sd[0] : sd[1]; |
520 |
if (i <= xstep) |
521 |
b = fillsample(scanline, zline, 0, y, i, 0, b/2); |
522 |
else |
523 |
b = fillsample(scanline+i-xstep, |
524 |
zline ? zline+i-xstep : (float *)NULL, |
525 |
i-xstep, y, xstep, 0, b/2); |
526 |
if (sd) *sd++ = nc & 1 ? bl : b; |
527 |
bl = b; |
528 |
} |
529 |
if (sd && nc & 1) *sd = bl; |
530 |
} |
531 |
|
532 |
|
533 |
fillscanbar(scanbar, zbar, xres, y, ysize) /* fill interior */ |
534 |
register COLOR *scanbar[]; |
535 |
register float *zbar[]; |
536 |
int xres, y, ysize; |
537 |
{ |
538 |
COLOR vline[MAXDIV+1]; |
539 |
float zline[MAXDIV+1]; |
540 |
int b = ysize; |
541 |
register int i, j; |
542 |
|
543 |
for (i = 0; i < xres; i++) { |
544 |
copycolor(vline[0], scanbar[0][i]); |
545 |
copycolor(vline[ysize], scanbar[ysize][i]); |
546 |
if (zbar[0]) { |
547 |
zline[0] = zbar[0][i]; |
548 |
zline[ysize] = zbar[ysize][i]; |
549 |
} |
550 |
b = fillsample(vline, zbar[0] ? zline : (float *)NULL, |
551 |
i, y, 0, ysize, b/2); |
552 |
|
553 |
for (j = 1; j < ysize; j++) |
554 |
copycolor(scanbar[j][i], vline[j]); |
555 |
if (zbar[0]) |
556 |
for (j = 1; j < ysize; j++) |
557 |
zbar[j][i] = zline[j]; |
558 |
} |
559 |
} |
560 |
|
561 |
|
562 |
int |
563 |
fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */ |
564 |
register COLOR *colline; |
565 |
register float *zline; |
566 |
int x, y; |
567 |
int xlen, ylen; |
568 |
int b; |
569 |
{ |
570 |
double ratio; |
571 |
double z; |
572 |
COLOR ctmp; |
573 |
int ncut; |
574 |
register int len; |
575 |
|
576 |
if (xlen > 0) /* x or y length is zero */ |
577 |
len = xlen; |
578 |
else |
579 |
len = ylen; |
580 |
|
581 |
if (len <= 1) /* limit recursion */ |
582 |
return(0); |
583 |
|
584 |
if (b > 0 || |
585 |
(zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len])) |
586 |
|| bigdiff(colline[0], colline[len], maxdiff)) { |
587 |
|
588 |
z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1)); |
589 |
if (zline) zline[len>>1] = z; |
590 |
ncut = 1; |
591 |
} else { /* interpolate */ |
592 |
copycolor(colline[len>>1], colline[len]); |
593 |
ratio = (double)(len>>1) / len; |
594 |
scalecolor(colline[len>>1], ratio); |
595 |
if (zline) zline[len>>1] = zline[len] * ratio; |
596 |
ratio = 1.0 - ratio; |
597 |
copycolor(ctmp, colline[0]); |
598 |
scalecolor(ctmp, ratio); |
599 |
addcolor(colline[len>>1], ctmp); |
600 |
if (zline) zline[len>>1] += zline[0] * ratio; |
601 |
ncut = 0; |
602 |
} |
603 |
/* recurse */ |
604 |
ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2); |
605 |
|
606 |
ncut += fillsample(colline+(len>>1), |
607 |
zline ? zline+(len>>1) : (float *)NULL, |
608 |
x+(xlen>>1), y+(ylen>>1), |
609 |
xlen-(xlen>>1), ylen-(ylen>>1), b/2); |
610 |
|
611 |
return(ncut); |
612 |
} |
613 |
|
614 |
|
615 |
double |
616 |
pixvalue(col, x, y) /* compute pixel value */ |
617 |
COLOR col; /* returned color */ |
618 |
int x, y; /* pixel position */ |
619 |
{ |
620 |
RAY thisray; |
621 |
FVECT lorg, ldir; |
622 |
double hpos, vpos, lmax, d; |
623 |
/* compute view ray */ |
624 |
hpos = (x+pixjitter())/hres; |
625 |
vpos = (y+pixjitter())/vres; |
626 |
if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, |
627 |
&ourview, hpos, vpos)) < -FTINY) { |
628 |
setcolor(col, 0.0, 0.0, 0.0); |
629 |
return(0.0); |
630 |
} |
631 |
|
632 |
samplendx = pixnumber(x,y,hres,vres); /* set pixel index */ |
633 |
|
634 |
/* optional motion blur */ |
635 |
if (lastview.type && mblur > FTINY && (lmax = viewray(lorg, ldir, |
636 |
&lastview, hpos, vpos)) >= -FTINY) { |
637 |
register int i; |
638 |
register double d = mblur*(.5-urand(281+samplendx)); |
639 |
|
640 |
thisray.rmax = (1.-d)*thisray.rmax + d*lmax; |
641 |
for (i = 3; i--; ) { |
642 |
thisray.rorg[i] = (1.-d)*thisray.rorg[i] + d*lorg[i]; |
643 |
thisray.rdir[i] = (1.-d)*thisray.rdir[i] + d*ldir[i]; |
644 |
} |
645 |
if (normalize(thisray.rdir) == 0.0) |
646 |
return(0.0); |
647 |
} |
648 |
|
649 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
650 |
|
651 |
rayvalue(&thisray); /* trace ray */ |
652 |
|
653 |
copycolor(col, thisray.rcol); /* return color */ |
654 |
|
655 |
return(thisray.rt); /* return distance */ |
656 |
} |
657 |
|
658 |
|
659 |
int |
660 |
salvage(oldfile) /* salvage scanlines from killed program */ |
661 |
char *oldfile; |
662 |
{ |
663 |
COLR *scanline; |
664 |
FILE *fp; |
665 |
int x, y; |
666 |
|
667 |
if (oldfile == NULL) |
668 |
goto gotzip; |
669 |
|
670 |
if ((fp = fopen(oldfile, "r")) == NULL) { |
671 |
sprintf(errmsg, "cannot open recover file \"%s\"", oldfile); |
672 |
error(WARNING, errmsg); |
673 |
goto gotzip; |
674 |
} |
675 |
SET_FILE_BINARY(fp); |
676 |
/* discard header */ |
677 |
getheader(fp, NULL, NULL); |
678 |
/* get picture size */ |
679 |
if (!fscnresolu(&x, &y, fp)) { |
680 |
sprintf(errmsg, "bad recover file \"%s\" - not removed", |
681 |
oldfile); |
682 |
error(WARNING, errmsg); |
683 |
fclose(fp); |
684 |
goto gotzip; |
685 |
} |
686 |
|
687 |
if (x != hres || y != vres) { |
688 |
sprintf(errmsg, "resolution mismatch in recover file \"%s\"", |
689 |
oldfile); |
690 |
error(USER, errmsg); |
691 |
} |
692 |
|
693 |
scanline = (COLR *)malloc(hres*sizeof(COLR)); |
694 |
if (scanline == NULL) |
695 |
error(SYSTEM, "out of memory in salvage"); |
696 |
for (y = 0; y < vres; y++) { |
697 |
if (freadcolrs(scanline, hres, fp) < 0) |
698 |
break; |
699 |
if (fwritecolrs(scanline, hres, stdout) < 0) |
700 |
goto writerr; |
701 |
} |
702 |
if (fflush(stdout) == EOF) |
703 |
goto writerr; |
704 |
free((void *)scanline); |
705 |
fclose(fp); |
706 |
unlink(oldfile); |
707 |
return(y); |
708 |
gotzip: |
709 |
if (fflush(stdout) == EOF) |
710 |
error(SYSTEM, "error writing picture header"); |
711 |
return(0); |
712 |
writerr: |
713 |
sprintf(errmsg, "write error during recovery of \"%s\"", oldfile); |
714 |
error(SYSTEM, errmsg); |
715 |
} |
716 |
|
717 |
|
718 |
int |
719 |
pixnumber(x, y, xres, yres) /* compute pixel index (brushed) */ |
720 |
register int x, y; |
721 |
int xres, yres; |
722 |
{ |
723 |
x -= y; |
724 |
while (x < 0) |
725 |
x += xres; |
726 |
return((((x>>2)*yres + y) << 2) + (x & 3)); |
727 |
} |