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