1 |
/* Copyright (c) 1995 Regents of the University of California */ |
2 |
|
3 |
#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ LBL"; |
5 |
#endif |
6 |
|
7 |
/* |
8 |
* rpict.c - routines and variables for picture generation. |
9 |
* |
10 |
* 8/14/85 |
11 |
*/ |
12 |
|
13 |
#include "ray.h" |
14 |
|
15 |
#include <sys/types.h> |
16 |
|
17 |
#ifndef NIX |
18 |
#ifdef BSD |
19 |
#include <sys/time.h> |
20 |
#include <sys/resource.h> |
21 |
#else |
22 |
#include <sys/times.h> |
23 |
#include <sys/utsname.h> |
24 |
#include <unistd.h> |
25 |
#endif |
26 |
#endif |
27 |
|
28 |
extern time_t time(); |
29 |
|
30 |
#include <signal.h> |
31 |
|
32 |
#include "view.h" |
33 |
|
34 |
#include "resolu.h" |
35 |
|
36 |
#include "random.h" |
37 |
|
38 |
#include "paths.h" |
39 |
|
40 |
#define RFTEMPLATE "rfXXXXXX" |
41 |
|
42 |
#ifndef SIGCONT |
43 |
#define SIGCONT SIGIO |
44 |
#endif |
45 |
|
46 |
int dimlist[MAXDIM]; /* sampling dimensions */ |
47 |
int ndims = 0; /* number of sampling dimensions */ |
48 |
int samplendx; /* sample index number */ |
49 |
|
50 |
VIEW ourview = STDVIEW; /* view parameters */ |
51 |
int hresolu = 512; /* horizontal resolution */ |
52 |
int vresolu = 512; /* vertical resolution */ |
53 |
double pixaspect = 1.0; /* pixel aspect ratio */ |
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|
55 |
int psample = 4; /* pixel sample size */ |
56 |
double maxdiff = .05; /* max. difference for interpolation */ |
57 |
double dstrpix = 0.67; /* square pixel distribution */ |
58 |
|
59 |
double dstrsrc = 0.0; /* square source distribution */ |
60 |
double shadthresh = .05; /* shadow threshold */ |
61 |
double shadcert = .5; /* shadow certainty */ |
62 |
int directrelay = 1; /* number of source relays */ |
63 |
int vspretest = 512; /* virtual source pretest density */ |
64 |
int directvis = 1; /* sources visible? */ |
65 |
double srcsizerat = .25; /* maximum ratio source size/dist. */ |
66 |
|
67 |
COLOR cextinction = BLKCOLOR; /* global extinction coefficient */ |
68 |
double salbedo = 0.; /* global scattering albedo */ |
69 |
double seccg = 0.; /* global scattering eccentricity */ |
70 |
double ssampdist = 0.; /* scatter sampling distance */ |
71 |
|
72 |
double specthresh = .15; /* specular sampling threshold */ |
73 |
double specjitter = 1.; /* specular sampling jitter */ |
74 |
|
75 |
int backvis = 1; /* back face visibility */ |
76 |
|
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int maxdepth = 6; /* maximum recursion depth */ |
78 |
double minweight = 5e-3; /* minimum ray weight */ |
79 |
|
80 |
COLOR ambval = BLKCOLOR; /* ambient value */ |
81 |
double ambacc = 0.2; /* ambient accuracy */ |
82 |
int ambres = 32; /* ambient resolution */ |
83 |
int ambdiv = 128; /* ambient divisions */ |
84 |
int ambssamp = 0; /* ambient super-samples */ |
85 |
int ambounce = 0; /* ambient bounces */ |
86 |
char *amblist[128]; /* ambient include/exclude list */ |
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int ambincl = -1; /* include == 1, exclude == 0 */ |
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|
89 |
#ifdef MSDOS |
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int ralrm = 60; /* seconds between reports */ |
91 |
#else |
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int ralrm = 0; /* seconds between reports */ |
93 |
#endif |
94 |
|
95 |
double pctdone = 0.0; /* percentage done */ |
96 |
|
97 |
time_t tlastrept = 0L; /* time at last report */ |
98 |
|
99 |
extern time_t tstart; /* starting time */ |
100 |
|
101 |
extern unsigned long nrays; /* number of rays traced */ |
102 |
|
103 |
#define MAXDIV 16 /* maximum sample size */ |
104 |
|
105 |
#define pixjitter() (.5+dstrpix*(.5-frandom())) |
106 |
|
107 |
static int hres, vres; /* resolution for this frame */ |
108 |
|
109 |
extern char *mktemp(); |
110 |
|
111 |
double pixvalue(); |
112 |
|
113 |
#ifdef NIX |
114 |
#define file_exists(f) (access(f,F_OK)==0) |
115 |
#else |
116 |
#include <sys/types.h> |
117 |
#include <sys/stat.h> |
118 |
int |
119 |
file_exists(fname) /* ordinary file exists? */ |
120 |
char *fname; |
121 |
{ |
122 |
struct stat sbuf; |
123 |
if (stat(fname, &sbuf) < 0) return(0); |
124 |
return((sbuf.st_mode & S_IFREG) != 0); |
125 |
} |
126 |
#endif |
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|
128 |
|
129 |
quit(code) /* quit program */ |
130 |
int code; |
131 |
{ |
132 |
if (code) /* report status */ |
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report(); |
134 |
headclean(); /* delete header file */ |
135 |
pfclean(); /* clean up persist files */ |
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exit(code); |
137 |
} |
138 |
|
139 |
|
140 |
#ifndef NIX |
141 |
report() /* report progress */ |
142 |
{ |
143 |
double u, s; |
144 |
#ifdef BSD |
145 |
char hostname[257]; |
146 |
struct rusage rubuf; |
147 |
#else |
148 |
struct tms tbuf; |
149 |
struct utsname nambuf; |
150 |
double period; |
151 |
#define hostname nambuf.nodename |
152 |
#endif |
153 |
|
154 |
tlastrept = time((time_t *)NULL); |
155 |
#ifdef BSD |
156 |
getrusage(RUSAGE_SELF, &rubuf); |
157 |
u = rubuf.ru_utime.tv_sec + rubuf.ru_utime.tv_usec/1e6; |
158 |
s = rubuf.ru_stime.tv_sec + rubuf.ru_stime.tv_usec/1e6; |
159 |
getrusage(RUSAGE_CHILDREN, &rubuf); |
160 |
u += rubuf.ru_utime.tv_sec + rubuf.ru_utime.tv_usec/1e6; |
161 |
s += rubuf.ru_stime.tv_sec + rubuf.ru_stime.tv_usec/1e6; |
162 |
gethostname(hostname, sizeof(hostname)); |
163 |
#else |
164 |
times(&tbuf); |
165 |
#ifdef _SC_CLK_TCK |
166 |
period = 1.0 / sysconf(_SC_CLK_TCK); |
167 |
#else |
168 |
period = 1.0 / 60.0; |
169 |
#endif |
170 |
u = ( tbuf.tms_utime + tbuf.tms_cutime ) * period; |
171 |
s = ( tbuf.tms_stime + tbuf.tms_cstime ) * period; |
172 |
uname(&nambuf); |
173 |
#endif |
174 |
|
175 |
sprintf(errmsg, |
176 |
"%lu rays, %4.2f%% after %.3fu %.3fs %.3fr hours on %s\n", |
177 |
nrays, pctdone, u/3600., s/3600., |
178 |
(tlastrept-tstart)/3600., hostname); |
179 |
eputs(errmsg); |
180 |
#ifndef BSD |
181 |
signal(SIGCONT, report); |
182 |
#undef hostname |
183 |
#endif |
184 |
} |
185 |
#else |
186 |
report() /* report progress */ |
187 |
{ |
188 |
tlastrept = time((time_t *)NULL); |
189 |
sprintf(errmsg, "%lu rays, %4.2f%% after %5.4f hours\n", |
190 |
nrays, pctdone, (tlastrept-tstart)/3600.0); |
191 |
eputs(errmsg); |
192 |
} |
193 |
#endif |
194 |
|
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|
196 |
rpict(seq, pout, zout, prvr) /* generate image(s) */ |
197 |
int seq; |
198 |
char *pout, *zout, *prvr; |
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/* |
200 |
* If seq is greater than zero, then we will render a sequence of |
201 |
* images based on view parameter strings read from the standard input. |
202 |
* If pout is NULL, then all images will be sent to the standard ouput. |
203 |
* If seq is greater than zero and prvr is an integer, then it is the |
204 |
* frame number at which rendering should begin. Preceeding view parameter |
205 |
* strings will be skipped in the input. |
206 |
* If pout and prvr are the same, prvr is renamed to avoid overwriting. |
207 |
* Note that pout and zout should contain %d format specifications for |
208 |
* sequenced file naming. |
209 |
*/ |
210 |
{ |
211 |
extern char *rindex(), *strncpy(), *strcat(), *strcpy(); |
212 |
char fbuf[128], fbuf2[128]; |
213 |
int npicts; |
214 |
register char *cp; |
215 |
RESOLU rs; |
216 |
double pa; |
217 |
/* check sampling */ |
218 |
if (psample < 1) |
219 |
psample = 1; |
220 |
else if (psample > MAXDIV) { |
221 |
sprintf(errmsg, "pixel sampling reduced from %d to %d", |
222 |
psample, MAXDIV); |
223 |
error(WARNING, errmsg); |
224 |
psample = MAXDIV; |
225 |
} |
226 |
/* get starting frame */ |
227 |
if (seq <= 0) |
228 |
seq = 0; |
229 |
else if (prvr != NULL && isint(prvr)) { |
230 |
register int rn; /* skip to specified view */ |
231 |
if ((rn = atoi(prvr)) < seq) |
232 |
error(USER, "recover frame less than start frame"); |
233 |
if (pout == NULL) |
234 |
error(USER, "missing output file specification"); |
235 |
for ( ; seq < rn; seq++) |
236 |
if (nextview(stdin) == EOF) |
237 |
error(USER, "unexpected EOF on view input"); |
238 |
prvr = fbuf; /* mark for renaming */ |
239 |
} |
240 |
if (pout != NULL & prvr != NULL) { |
241 |
sprintf(fbuf, pout, seq); |
242 |
if (!strcmp(prvr, fbuf)) { /* rename */ |
243 |
strcpy(fbuf2, fbuf); |
244 |
for (cp = fbuf2; *cp; cp++) |
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; |
246 |
while (cp > fbuf2 && !ISDIRSEP(cp[-1])) |
247 |
cp--; |
248 |
strcpy(cp, RFTEMPLATE); |
249 |
prvr = mktemp(fbuf2); |
250 |
if (rename(fbuf, prvr) < 0) |
251 |
if (errno == ENOENT) { /* ghost file */ |
252 |
sprintf(errmsg, |
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"new output file \"%s\"", |
254 |
fbuf); |
255 |
error(WARNING, errmsg); |
256 |
prvr = NULL; |
257 |
} else { /* serious error */ |
258 |
sprintf(errmsg, |
259 |
"cannot rename \"%s\" to \"%s\"", |
260 |
fbuf, prvr); |
261 |
error(SYSTEM, errmsg); |
262 |
} |
263 |
} |
264 |
} |
265 |
npicts = 0; /* render sequence */ |
266 |
do { |
267 |
if (seq && nextview(stdin) == EOF) |
268 |
break; |
269 |
pctdone = 0.0; |
270 |
if (pout != NULL) { |
271 |
sprintf(fbuf, pout, seq); |
272 |
if (file_exists(fbuf)) { |
273 |
if (prvr != NULL || !strcmp(fbuf, pout)) { |
274 |
sprintf(errmsg, |
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"output file \"%s\" exists", |
276 |
fbuf); |
277 |
error(USER, errmsg); |
278 |
} |
279 |
continue; /* don't clobber */ |
280 |
} |
281 |
if (freopen(fbuf, "w", stdout) == NULL) { |
282 |
sprintf(errmsg, |
283 |
"cannot open output file \"%s\"", fbuf); |
284 |
error(SYSTEM, errmsg); |
285 |
} |
286 |
#ifdef MSDOS |
287 |
setmode(fileno(stdout), O_BINARY); |
288 |
#endif |
289 |
dupheader(); |
290 |
} |
291 |
hres = hresolu; vres = vresolu; pa = pixaspect; |
292 |
if (prvr != NULL) |
293 |
if (viewfile(prvr, &ourview, &rs) <= 0 |
294 |
|| rs.or != PIXSTANDARD) { |
295 |
sprintf(errmsg, |
296 |
"cannot recover view parameters from \"%s\"", prvr); |
297 |
error(WARNING, errmsg); |
298 |
} else { |
299 |
pa = 0.0; |
300 |
hres = scanlen(&rs); |
301 |
vres = numscans(&rs); |
302 |
} |
303 |
if ((cp = setview(&ourview)) != NULL) |
304 |
error(USER, cp); |
305 |
normaspect(viewaspect(&ourview), &pa, &hres, &vres); |
306 |
if (seq) { |
307 |
if (ralrm > 0) { |
308 |
fprintf(stderr, "FRAME %d:", seq); |
309 |
fprintview(&ourview, stderr); |
310 |
putc('\n', stderr); |
311 |
fflush(stderr); |
312 |
} |
313 |
printf("FRAME=%d\n", seq); |
314 |
} |
315 |
fputs(VIEWSTR, stdout); |
316 |
fprintview(&ourview, stdout); |
317 |
putchar('\n'); |
318 |
if (pa < .99 || pa > 1.01) |
319 |
fputaspect(pa, stdout); |
320 |
fputformat(COLRFMT, stdout); |
321 |
putchar('\n'); |
322 |
if (zout != NULL) |
323 |
sprintf(cp=fbuf, zout, seq); |
324 |
else |
325 |
cp = NULL; |
326 |
render(cp, prvr); |
327 |
prvr = NULL; |
328 |
npicts++; |
329 |
} while (seq++); |
330 |
/* check that we did something */ |
331 |
if (npicts == 0) |
332 |
error(WARNING, "no output produced"); |
333 |
} |
334 |
|
335 |
|
336 |
nextview(fp) /* get next view from fp */ |
337 |
FILE *fp; |
338 |
{ |
339 |
char linebuf[256]; |
340 |
|
341 |
while (fgets(linebuf, sizeof(linebuf), fp) != NULL) |
342 |
if (isview(linebuf) && sscanview(&ourview, linebuf) > 0) |
343 |
return(0); |
344 |
return(EOF); |
345 |
} |
346 |
|
347 |
|
348 |
render(zfile, oldfile) /* render the scene */ |
349 |
char *zfile, *oldfile; |
350 |
{ |
351 |
extern long lseek(); |
352 |
COLOR *scanbar[MAXDIV+1]; /* scanline arrays of pixel values */ |
353 |
float *zbar[MAXDIV+1]; /* z values */ |
354 |
char *sampdens; /* previous sample density */ |
355 |
int ypos; /* current scanline */ |
356 |
int ystep; /* current y step size */ |
357 |
int hstep; /* h step size */ |
358 |
int zfd; |
359 |
COLOR *colptr; |
360 |
float *zptr; |
361 |
register int i; |
362 |
/* allocate scanlines */ |
363 |
for (i = 0; i <= psample; i++) { |
364 |
scanbar[i] = (COLOR *)malloc(hres*sizeof(COLOR)); |
365 |
if (scanbar[i] == NULL) |
366 |
goto memerr; |
367 |
} |
368 |
hstep = (psample*140+49)/99; /* quincunx sampling */ |
369 |
ystep = (psample*99+70)/140; |
370 |
if (hstep > 2) { |
371 |
i = hres/hstep + 2; |
372 |
if ((sampdens = malloc(i)) == NULL) |
373 |
goto memerr; |
374 |
while (i--) |
375 |
sampdens[i] = hstep; |
376 |
} else |
377 |
sampdens = NULL; |
378 |
/* open z-file */ |
379 |
if (zfile != NULL) { |
380 |
if ((zfd = open(zfile, O_WRONLY|O_CREAT, 0666)) == -1) { |
381 |
sprintf(errmsg, "cannot open z-file \"%s\"", zfile); |
382 |
error(SYSTEM, errmsg); |
383 |
} |
384 |
#ifdef MSDOS |
385 |
setmode(zfd, O_BINARY); |
386 |
#endif |
387 |
for (i = 0; i <= psample; i++) { |
388 |
zbar[i] = (float *)malloc(hres*sizeof(float)); |
389 |
if (zbar[i] == NULL) |
390 |
goto memerr; |
391 |
} |
392 |
} else { |
393 |
zfd = -1; |
394 |
for (i = 0; i <= psample; i++) |
395 |
zbar[i] = NULL; |
396 |
} |
397 |
/* write out boundaries */ |
398 |
fprtresolu(hres, vres, stdout); |
399 |
/* recover file and compute first */ |
400 |
i = salvage(oldfile); |
401 |
if (zfd != -1 && i > 0 && |
402 |
lseek(zfd, (long)i*hres*sizeof(float), 0) == -1) |
403 |
error(SYSTEM, "z-file seek error in render"); |
404 |
pctdone = 100.0*i/vres; |
405 |
if (ralrm > 0) /* report init stats */ |
406 |
report(); |
407 |
#ifndef BSD |
408 |
else |
409 |
#endif |
410 |
signal(SIGCONT, report); |
411 |
ypos = vres-1 - i; |
412 |
fillscanline(scanbar[0], zbar[0], sampdens, hres, ypos, hstep); |
413 |
/* compute scanlines */ |
414 |
for (ypos -= ystep; ypos > -ystep; ypos -= ystep) { |
415 |
/* bottom adjust? */ |
416 |
if (ypos < 0) { |
417 |
ystep += ypos; |
418 |
ypos = 0; |
419 |
} |
420 |
colptr = scanbar[ystep]; /* move base to top */ |
421 |
scanbar[ystep] = scanbar[0]; |
422 |
scanbar[0] = colptr; |
423 |
zptr = zbar[ystep]; |
424 |
zbar[ystep] = zbar[0]; |
425 |
zbar[0] = zptr; |
426 |
/* fill base line */ |
427 |
fillscanline(scanbar[0], zbar[0], sampdens, |
428 |
hres, ypos, hstep); |
429 |
/* fill bar */ |
430 |
fillscanbar(scanbar, zbar, hres, ypos, ystep); |
431 |
/* write it out */ |
432 |
#ifndef BSD |
433 |
signal(SIGCONT, SIG_IGN); /* don't interrupt writes */ |
434 |
#endif |
435 |
for (i = ystep; i > 0; i--) { |
436 |
if (zfd != -1 && write(zfd, (char *)zbar[i], |
437 |
hres*sizeof(float)) |
438 |
< hres*sizeof(float)) |
439 |
goto writerr; |
440 |
if (fwritescan(scanbar[i], hres, stdout) < 0) |
441 |
goto writerr; |
442 |
} |
443 |
if (fflush(stdout) == EOF) |
444 |
goto writerr; |
445 |
/* record progress */ |
446 |
pctdone = 100.0*(vres-1-ypos)/vres; |
447 |
if (ralrm > 0 && time((time_t *)NULL) >= tlastrept+ralrm) |
448 |
report(); |
449 |
#ifndef BSD |
450 |
else |
451 |
signal(SIGCONT, report); |
452 |
#endif |
453 |
} |
454 |
/* clean up */ |
455 |
signal(SIGCONT, SIG_IGN); |
456 |
if (zfd != -1) { |
457 |
if (write(zfd, (char *)zbar[0], hres*sizeof(float)) |
458 |
< hres*sizeof(float)) |
459 |
goto writerr; |
460 |
if (close(zfd) == -1) |
461 |
goto writerr; |
462 |
for (i = 0; i <= psample; i++) |
463 |
free((char *)zbar[i]); |
464 |
} |
465 |
fwritescan(scanbar[0], hres, stdout); |
466 |
if (fflush(stdout) == EOF) |
467 |
goto writerr; |
468 |
for (i = 0; i <= psample; i++) |
469 |
free((char *)scanbar[i]); |
470 |
if (sampdens != NULL) |
471 |
free(sampdens); |
472 |
pctdone = 100.0; |
473 |
if (ralrm > 0) |
474 |
report(); |
475 |
signal(SIGCONT, SIG_DFL); |
476 |
return; |
477 |
writerr: |
478 |
error(SYSTEM, "write error in render"); |
479 |
memerr: |
480 |
error(SYSTEM, "out of memory in render"); |
481 |
} |
482 |
|
483 |
|
484 |
fillscanline(scanline, zline, sd, xres, y, xstep) /* fill scan at y */ |
485 |
register COLOR *scanline; |
486 |
register float *zline; |
487 |
register char *sd; |
488 |
int xres, y, xstep; |
489 |
{ |
490 |
static int nc = 0; /* number of calls */ |
491 |
int bl = xstep, b = xstep; |
492 |
double z; |
493 |
register int i; |
494 |
|
495 |
z = pixvalue(scanline[0], 0, y); |
496 |
if (zline) zline[0] = z; |
497 |
/* zig-zag start for quincunx pattern */ |
498 |
for (i = ++nc & 1 ? xstep : xstep/2; i < xres-1+xstep; i += xstep) { |
499 |
if (i >= xres) { |
500 |
xstep += xres-1-i; |
501 |
i = xres-1; |
502 |
} |
503 |
z = pixvalue(scanline[i], i, y); |
504 |
if (zline) zline[i] = z; |
505 |
if (sd) b = sd[0] > sd[1] ? sd[0] : sd[1]; |
506 |
if (i <= xstep) |
507 |
b = fillsample(scanline, zline, 0, y, i, 0, b/2); |
508 |
else |
509 |
b = fillsample(scanline+i-xstep, |
510 |
zline ? zline+i-xstep : (float *)NULL, |
511 |
i-xstep, y, xstep, 0, b/2); |
512 |
if (sd) *sd++ = nc & 1 ? bl : b; |
513 |
bl = b; |
514 |
} |
515 |
if (sd && nc & 1) *sd = bl; |
516 |
} |
517 |
|
518 |
|
519 |
fillscanbar(scanbar, zbar, xres, y, ysize) /* fill interior */ |
520 |
register COLOR *scanbar[]; |
521 |
register float *zbar[]; |
522 |
int xres, y, ysize; |
523 |
{ |
524 |
COLOR vline[MAXDIV+1]; |
525 |
float zline[MAXDIV+1]; |
526 |
int b = ysize; |
527 |
register int i, j; |
528 |
|
529 |
for (i = 0; i < xres; i++) { |
530 |
|
531 |
copycolor(vline[0], scanbar[0][i]); |
532 |
copycolor(vline[ysize], scanbar[ysize][i]); |
533 |
if (zbar[0]) { |
534 |
zline[0] = zbar[0][i]; |
535 |
zline[ysize] = zbar[ysize][i]; |
536 |
} |
537 |
|
538 |
b = fillsample(vline, zbar[0] ? zline : (float *)NULL, |
539 |
i, y, 0, ysize, b/2); |
540 |
|
541 |
for (j = 1; j < ysize; j++) |
542 |
copycolor(scanbar[j][i], vline[j]); |
543 |
if (zbar[0]) |
544 |
for (j = 1; j < ysize; j++) |
545 |
zbar[j][i] = zline[j]; |
546 |
} |
547 |
} |
548 |
|
549 |
|
550 |
int |
551 |
fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */ |
552 |
register COLOR *colline; |
553 |
register float *zline; |
554 |
int x, y; |
555 |
int xlen, ylen; |
556 |
int b; |
557 |
{ |
558 |
double ratio; |
559 |
double z; |
560 |
COLOR ctmp; |
561 |
int ncut; |
562 |
register int len; |
563 |
|
564 |
if (xlen > 0) /* x or y length is zero */ |
565 |
len = xlen; |
566 |
else |
567 |
len = ylen; |
568 |
|
569 |
if (len <= 1) /* limit recursion */ |
570 |
return(0); |
571 |
|
572 |
if (b > 0 |
573 |
|| (zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len])) |
574 |
|| bigdiff(colline[0], colline[len], maxdiff)) { |
575 |
|
576 |
z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1)); |
577 |
if (zline) zline[len>>1] = z; |
578 |
ncut = 1; |
579 |
|
580 |
} else { /* interpolate */ |
581 |
|
582 |
copycolor(colline[len>>1], colline[len]); |
583 |
ratio = (double)(len>>1) / len; |
584 |
scalecolor(colline[len>>1], ratio); |
585 |
if (zline) zline[len>>1] = zline[len] * ratio; |
586 |
ratio = 1.0 - ratio; |
587 |
copycolor(ctmp, colline[0]); |
588 |
scalecolor(ctmp, ratio); |
589 |
addcolor(colline[len>>1], ctmp); |
590 |
if (zline) zline[len>>1] += zline[0] * ratio; |
591 |
ncut = 0; |
592 |
} |
593 |
/* recurse */ |
594 |
ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2); |
595 |
|
596 |
ncut += fillsample(colline+(len>>1), |
597 |
zline ? zline+(len>>1) : (float *)NULL, |
598 |
x+(xlen>>1), y+(ylen>>1), |
599 |
xlen-(xlen>>1), ylen-(ylen>>1), b/2); |
600 |
|
601 |
return(ncut); |
602 |
} |
603 |
|
604 |
|
605 |
double |
606 |
pixvalue(col, x, y) /* compute pixel value */ |
607 |
COLOR col; /* returned color */ |
608 |
int x, y; /* pixel position */ |
609 |
{ |
610 |
static RAY thisray; |
611 |
|
612 |
if ((thisray.rmax = viewray(thisray.rorg, thisray.rdir, &ourview, |
613 |
(x+pixjitter())/hres, (y+pixjitter())/vres)) < -FTINY) { |
614 |
setcolor(col, 0.0, 0.0, 0.0); |
615 |
return(0.0); |
616 |
} |
617 |
|
618 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
619 |
|
620 |
samplendx = pixnumber(x,y,hres,vres); /* set pixel index */ |
621 |
|
622 |
rayvalue(&thisray); /* trace ray */ |
623 |
|
624 |
copycolor(col, thisray.rcol); /* return color */ |
625 |
|
626 |
return(thisray.rt); /* return distance */ |
627 |
} |
628 |
|
629 |
|
630 |
int |
631 |
salvage(oldfile) /* salvage scanlines from killed program */ |
632 |
char *oldfile; |
633 |
{ |
634 |
COLR *scanline; |
635 |
FILE *fp; |
636 |
int x, y; |
637 |
|
638 |
if (oldfile == NULL) |
639 |
goto gotzip; |
640 |
|
641 |
if ((fp = fopen(oldfile, "r")) == NULL) { |
642 |
sprintf(errmsg, "cannot open recover file \"%s\"", oldfile); |
643 |
error(WARNING, errmsg); |
644 |
goto gotzip; |
645 |
} |
646 |
#ifdef MSDOS |
647 |
setmode(fileno(fp), O_BINARY); |
648 |
#endif |
649 |
/* discard header */ |
650 |
getheader(fp, NULL, NULL); |
651 |
/* get picture size */ |
652 |
if (!fscnresolu(&x, &y, fp)) { |
653 |
sprintf(errmsg, "bad recover file \"%s\" - not removed", |
654 |
oldfile); |
655 |
error(WARNING, errmsg); |
656 |
fclose(fp); |
657 |
goto gotzip; |
658 |
} |
659 |
|
660 |
if (x != hres || y != vres) { |
661 |
sprintf(errmsg, "resolution mismatch in recover file \"%s\"", |
662 |
oldfile); |
663 |
error(USER, errmsg); |
664 |
} |
665 |
|
666 |
scanline = (COLR *)malloc(hres*sizeof(COLR)); |
667 |
if (scanline == NULL) |
668 |
error(SYSTEM, "out of memory in salvage"); |
669 |
for (y = 0; y < vres; y++) { |
670 |
if (freadcolrs(scanline, hres, fp) < 0) |
671 |
break; |
672 |
if (fwritecolrs(scanline, hres, stdout) < 0) |
673 |
goto writerr; |
674 |
} |
675 |
if (fflush(stdout) == EOF) |
676 |
goto writerr; |
677 |
free((char *)scanline); |
678 |
fclose(fp); |
679 |
unlink(oldfile); |
680 |
return(y); |
681 |
gotzip: |
682 |
if (fflush(stdout) == EOF) |
683 |
error(SYSTEM, "error writing picture header"); |
684 |
return(0); |
685 |
writerr: |
686 |
sprintf(errmsg, "write error during recovery of \"%s\"", oldfile); |
687 |
error(SYSTEM, errmsg); |
688 |
} |
689 |
|
690 |
|
691 |
int |
692 |
pixnumber(x, y, xres, yres) /* compute pixel index (brushed) */ |
693 |
register int x, y; |
694 |
int xres, yres; |
695 |
{ |
696 |
x -= y; |
697 |
while (x < 0) |
698 |
x += xres; |
699 |
return((((x>>2)*yres + y) << 2) + (x & 3)); |
700 |
} |