| 1 |
/* Copyright (c) 1986 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 |
#ifdef BSD |
| 16 |
#include <sys/time.h> |
| 17 |
#include <sys/resource.h> |
| 18 |
#else |
| 19 |
#include <signal.h> |
| 20 |
#endif |
| 21 |
#include <fcntl.h> |
| 22 |
|
| 23 |
#include "view.h" |
| 24 |
|
| 25 |
#include "random.h" |
| 26 |
|
| 27 |
VIEW ourview = STDVIEW; /* view parameters */ |
| 28 |
int hresolu = 512; /* horizontal resolution */ |
| 29 |
int vresolu = 512; /* vertical resolution */ |
| 30 |
double pixaspect = 1.0; /* pixel aspect ratio */ |
| 31 |
|
| 32 |
int psample = 4; /* pixel sample size */ |
| 33 |
double maxdiff = .05; /* max. difference for interpolation */ |
| 34 |
double dstrpix = 0.67; /* square pixel distribution */ |
| 35 |
|
| 36 |
double dstrsrc = 0.0; /* square source distribution */ |
| 37 |
double shadthresh = .05; /* shadow threshold */ |
| 38 |
double shadcert = .5; /* shadow certainty */ |
| 39 |
|
| 40 |
int maxdepth = 6; /* maximum recursion depth */ |
| 41 |
double minweight = 5e-3; /* minimum ray weight */ |
| 42 |
|
| 43 |
COLOR ambval = BLKCOLOR; /* ambient value */ |
| 44 |
double ambacc = 0.2; /* ambient accuracy */ |
| 45 |
int ambres = 32; /* ambient resolution */ |
| 46 |
int ambdiv = 128; /* ambient divisions */ |
| 47 |
int ambssamp = 0; /* ambient super-samples */ |
| 48 |
int ambounce = 0; /* ambient bounces */ |
| 49 |
char *amblist[128]; /* ambient include/exclude list */ |
| 50 |
int ambincl = -1; /* include == 1, exclude == 0 */ |
| 51 |
|
| 52 |
int ralrm = 0; /* seconds between reports */ |
| 53 |
|
| 54 |
double pctdone = 0.0; /* percentage done */ |
| 55 |
|
| 56 |
extern long nrays; /* number of rays traced */ |
| 57 |
|
| 58 |
#define MAXDIV 32 /* maximum sample size */ |
| 59 |
|
| 60 |
#define pixjitter() (.5+dstrpix*(.5-frandom())) |
| 61 |
|
| 62 |
double pixvalue(); |
| 63 |
|
| 64 |
|
| 65 |
quit(code) /* quit program */ |
| 66 |
int code; |
| 67 |
{ |
| 68 |
if (code || ralrm > 0) /* report status */ |
| 69 |
report(); |
| 70 |
|
| 71 |
exit(code); |
| 72 |
} |
| 73 |
|
| 74 |
|
| 75 |
report() /* report progress */ |
| 76 |
{ |
| 77 |
#ifdef BSD |
| 78 |
struct rusage rubuf; |
| 79 |
double t; |
| 80 |
|
| 81 |
getrusage(RUSAGE_SELF, &rubuf); |
| 82 |
t = (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
| 83 |
t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
| 84 |
getrusage(RUSAGE_CHILDREN, &rubuf); |
| 85 |
t += (rubuf.ru_utime.tv_usec + rubuf.ru_stime.tv_usec) / 1e6; |
| 86 |
t += rubuf.ru_utime.tv_sec + rubuf.ru_stime.tv_sec; |
| 87 |
|
| 88 |
sprintf(errmsg, "%ld rays, %4.2f%% done after %5.4f CPU hours\n", |
| 89 |
nrays, pctdone, t/3600.0); |
| 90 |
#else |
| 91 |
signal(SIGALRM, report); |
| 92 |
sprintf(errmsg, "%ld rays, %4.2f%% done\n", nrays, pctdone); |
| 93 |
#endif |
| 94 |
eputs(errmsg); |
| 95 |
|
| 96 |
if (ralrm > 0) |
| 97 |
alarm(ralrm); |
| 98 |
} |
| 99 |
|
| 100 |
|
| 101 |
render(zfile, oldfile) /* render the scene */ |
| 102 |
char *zfile, *oldfile; |
| 103 |
{ |
| 104 |
extern long lseek(); |
| 105 |
COLOR *scanbar[MAXDIV+1]; /* scanline arrays of pixel values */ |
| 106 |
float *zbar[MAXDIV+1]; /* z values */ |
| 107 |
int ypos; /* current scanline */ |
| 108 |
int ystep; /* current y step size */ |
| 109 |
int zfd; |
| 110 |
COLOR *colptr; |
| 111 |
float *zptr; |
| 112 |
register int i; |
| 113 |
/* check sampling */ |
| 114 |
if (psample < 1) |
| 115 |
psample = 1; |
| 116 |
else if (psample > MAXDIV) |
| 117 |
psample = MAXDIV; |
| 118 |
/* allocate scanlines */ |
| 119 |
for (i = 0; i <= psample; i++) { |
| 120 |
scanbar[i] = (COLOR *)malloc(hresolu*sizeof(COLOR)); |
| 121 |
if (scanbar[i] == NULL) |
| 122 |
goto memerr; |
| 123 |
} |
| 124 |
/* open z file */ |
| 125 |
if (zfile != NULL) { |
| 126 |
if ((zfd = open(zfile, O_WRONLY|O_CREAT, 0666)) == -1) { |
| 127 |
sprintf(errmsg, "cannot open z file \"%s\"", zfile); |
| 128 |
error(SYSTEM, errmsg); |
| 129 |
} |
| 130 |
for (i = 0; i <= psample; i++) { |
| 131 |
zbar[i] = (float *)malloc(hresolu*sizeof(float)); |
| 132 |
if (zbar[i] == NULL) |
| 133 |
goto memerr; |
| 134 |
} |
| 135 |
} else { |
| 136 |
zfd = -1; |
| 137 |
for (i = 0; i <= psample; i++) |
| 138 |
zbar[i] = NULL; |
| 139 |
} |
| 140 |
/* write out boundaries */ |
| 141 |
fputresolu(YMAJOR|YDECR, hresolu, vresolu, stdout); |
| 142 |
/* recover file and compute first */ |
| 143 |
i = salvage(oldfile); |
| 144 |
if (zfd != -1 && lseek(zfd, (long)i*hresolu*sizeof(float), 0) == -1) |
| 145 |
error(SYSTEM, "z file seek error in render"); |
| 146 |
ypos = vresolu-1 - i; |
| 147 |
fillscanline(scanbar[0], zbar[0], hresolu, ypos, psample); |
| 148 |
ystep = psample; |
| 149 |
/* compute scanlines */ |
| 150 |
for (ypos -= ystep; ypos > -ystep; ypos -= ystep) { |
| 151 |
/* record progress */ |
| 152 |
pctdone = 100.0*(vresolu-1-ypos-ystep)/vresolu; |
| 153 |
/* bottom adjust? */ |
| 154 |
if (ypos < 0) { |
| 155 |
ystep += ypos; |
| 156 |
ypos = 0; |
| 157 |
} |
| 158 |
colptr = scanbar[ystep]; /* move base to top */ |
| 159 |
scanbar[ystep] = scanbar[0]; |
| 160 |
scanbar[0] = colptr; |
| 161 |
zptr = zbar[ystep]; |
| 162 |
zbar[ystep] = zbar[0]; |
| 163 |
zbar[0] = zptr; |
| 164 |
/* fill base line */ |
| 165 |
fillscanline(scanbar[0], zbar[0], hresolu, ypos, psample); |
| 166 |
/* fill bar */ |
| 167 |
fillscanbar(scanbar, zbar, hresolu, ypos, ystep); |
| 168 |
/* write it out */ |
| 169 |
for (i = ystep; i > 0; i--) { |
| 170 |
if (zfd != -1 && write(zfd, (char *)zbar[i], |
| 171 |
hresolu*sizeof(float)) |
| 172 |
< hresolu*sizeof(float)) |
| 173 |
goto writerr; |
| 174 |
if (fwritescan(scanbar[i], hresolu, stdout) < 0) |
| 175 |
goto writerr; |
| 176 |
} |
| 177 |
if (fflush(stdout) == EOF) |
| 178 |
goto writerr; |
| 179 |
} |
| 180 |
/* clean up */ |
| 181 |
if (zfd != -1) { |
| 182 |
if (write(zfd, (char *)zbar[0], hresolu*sizeof(float)) |
| 183 |
< hresolu*sizeof(float)) |
| 184 |
goto writerr; |
| 185 |
if (close(zfd) == -1) |
| 186 |
goto writerr; |
| 187 |
for (i = 0; i <= psample; i++) |
| 188 |
free((char *)zbar[i]); |
| 189 |
} |
| 190 |
fwritescan(scanbar[0], hresolu, stdout); |
| 191 |
if (fflush(stdout) == EOF) |
| 192 |
goto writerr; |
| 193 |
for (i = 0; i <= psample; i++) |
| 194 |
free((char *)scanbar[i]); |
| 195 |
pctdone = 100.0; |
| 196 |
return; |
| 197 |
writerr: |
| 198 |
error(SYSTEM, "write error in render"); |
| 199 |
memerr: |
| 200 |
error(SYSTEM, "out of memory in render"); |
| 201 |
} |
| 202 |
|
| 203 |
|
| 204 |
fillscanline(scanline, zline, xres, y, xstep) /* fill scan line at y */ |
| 205 |
register COLOR *scanline; |
| 206 |
register float *zline; |
| 207 |
int xres, y, xstep; |
| 208 |
{ |
| 209 |
int b = xstep; |
| 210 |
double z; |
| 211 |
register int i; |
| 212 |
|
| 213 |
z = pixvalue(scanline[0], 0, y); |
| 214 |
if (zline) zline[0] = z; |
| 215 |
|
| 216 |
for (i = xstep; i < xres-1+xstep; i += xstep) { |
| 217 |
if (i >= xres) { |
| 218 |
xstep += xres-1-i; |
| 219 |
i = xres-1; |
| 220 |
} |
| 221 |
z = pixvalue(scanline[i], i, y); |
| 222 |
if (zline) zline[i] = z; |
| 223 |
|
| 224 |
b = fillsample(scanline+i-xstep, zline ? zline+i-xstep : NULL, |
| 225 |
i-xstep, y, xstep, 0, b/2); |
| 226 |
} |
| 227 |
} |
| 228 |
|
| 229 |
|
| 230 |
fillscanbar(scanbar, zbar, xres, y, ysize) /* fill interior */ |
| 231 |
register COLOR *scanbar[]; |
| 232 |
register float *zbar[]; |
| 233 |
int xres, y, ysize; |
| 234 |
{ |
| 235 |
COLOR vline[MAXDIV+1]; |
| 236 |
float zline[MAXDIV+1]; |
| 237 |
int b = ysize; |
| 238 |
register int i, j; |
| 239 |
|
| 240 |
for (i = 0; i < xres; i++) { |
| 241 |
|
| 242 |
copycolor(vline[0], scanbar[0][i]); |
| 243 |
copycolor(vline[ysize], scanbar[ysize][i]); |
| 244 |
if (zbar[0]) { |
| 245 |
zline[0] = zbar[0][i]; |
| 246 |
zline[ysize] = zbar[ysize][i]; |
| 247 |
} |
| 248 |
|
| 249 |
b = fillsample(vline, zbar[0] ? zline : NULL, |
| 250 |
i, y, 0, ysize, b/2); |
| 251 |
|
| 252 |
for (j = 1; j < ysize; j++) |
| 253 |
copycolor(scanbar[j][i], vline[j]); |
| 254 |
if (zbar[0]) |
| 255 |
for (j = 1; j < ysize; j++) |
| 256 |
zbar[j][i] = zline[j]; |
| 257 |
} |
| 258 |
} |
| 259 |
|
| 260 |
|
| 261 |
int |
| 262 |
fillsample(colline, zline, x, y, xlen, ylen, b) /* fill interior points */ |
| 263 |
register COLOR *colline; |
| 264 |
register float *zline; |
| 265 |
int x, y; |
| 266 |
int xlen, ylen; |
| 267 |
int b; |
| 268 |
{ |
| 269 |
extern double fabs(); |
| 270 |
double ratio; |
| 271 |
double z; |
| 272 |
COLOR ctmp; |
| 273 |
int ncut; |
| 274 |
register int len; |
| 275 |
|
| 276 |
if (xlen > 0) /* x or y length is zero */ |
| 277 |
len = xlen; |
| 278 |
else |
| 279 |
len = ylen; |
| 280 |
|
| 281 |
if (len <= 1) /* limit recursion */ |
| 282 |
return(0); |
| 283 |
|
| 284 |
if (b > 0 |
| 285 |
|| (zline && 2.*fabs(zline[0]-zline[len]) > maxdiff*(zline[0]+zline[len])) |
| 286 |
|| bigdiff(colline[0], colline[len], maxdiff)) { |
| 287 |
|
| 288 |
z = pixvalue(colline[len>>1], x + (xlen>>1), y + (ylen>>1)); |
| 289 |
if (zline) zline[len>>1] = z; |
| 290 |
ncut = 1; |
| 291 |
|
| 292 |
} else { /* interpolate */ |
| 293 |
|
| 294 |
copycolor(colline[len>>1], colline[len]); |
| 295 |
ratio = (double)(len>>1) / len; |
| 296 |
scalecolor(colline[len>>1], ratio); |
| 297 |
if (zline) zline[len>>1] = zline[len] * ratio; |
| 298 |
ratio = 1.0 - ratio; |
| 299 |
copycolor(ctmp, colline[0]); |
| 300 |
scalecolor(ctmp, ratio); |
| 301 |
addcolor(colline[len>>1], ctmp); |
| 302 |
if (zline) zline[len>>1] += zline[0] * ratio; |
| 303 |
ncut = 0; |
| 304 |
} |
| 305 |
/* recurse */ |
| 306 |
ncut += fillsample(colline, zline, x, y, xlen>>1, ylen>>1, (b-1)/2); |
| 307 |
|
| 308 |
ncut += fillsample(colline+(len>>1), zline ? zline+(len>>1) : NULL, |
| 309 |
x+(xlen>>1), y+(ylen>>1), |
| 310 |
xlen-(xlen>>1), ylen-(ylen>>1), b/2); |
| 311 |
|
| 312 |
return(ncut); |
| 313 |
} |
| 314 |
|
| 315 |
|
| 316 |
double |
| 317 |
pixvalue(col, x, y) /* compute pixel value */ |
| 318 |
COLOR col; /* returned color */ |
| 319 |
int x, y; /* pixel position */ |
| 320 |
{ |
| 321 |
static RAY thisray; /* our ray for this pixel */ |
| 322 |
|
| 323 |
viewray(thisray.rorg, thisray.rdir, &ourview, |
| 324 |
(x+pixjitter())/hresolu, (y+pixjitter())/vresolu); |
| 325 |
|
| 326 |
rayorigin(&thisray, NULL, PRIMARY, 1.0); |
| 327 |
|
| 328 |
rayvalue(&thisray); /* trace ray */ |
| 329 |
|
| 330 |
copycolor(col, thisray.rcol); /* return color */ |
| 331 |
|
| 332 |
return(thisray.rt); /* return distance */ |
| 333 |
} |
| 334 |
|
| 335 |
|
| 336 |
int |
| 337 |
salvage(oldfile) /* salvage scanlines from killed program */ |
| 338 |
char *oldfile; |
| 339 |
{ |
| 340 |
COLR *scanline; |
| 341 |
FILE *fp; |
| 342 |
int x, y; |
| 343 |
|
| 344 |
if (oldfile == NULL) |
| 345 |
return(0); |
| 346 |
|
| 347 |
if ((fp = fopen(oldfile, "r")) == NULL) { |
| 348 |
sprintf(errmsg, "cannot open recover file \"%s\"", oldfile); |
| 349 |
error(WARNING, errmsg); |
| 350 |
return(0); |
| 351 |
} |
| 352 |
/* discard header */ |
| 353 |
getheader(fp, NULL); |
| 354 |
/* get picture size */ |
| 355 |
if (fgetresolu(&x, &y, fp) != (YMAJOR|YDECR)) { |
| 356 |
sprintf(errmsg, "bad recover file \"%s\"", oldfile); |
| 357 |
error(WARNING, errmsg); |
| 358 |
fclose(fp); |
| 359 |
return(0); |
| 360 |
} |
| 361 |
|
| 362 |
if (x != hresolu || y != vresolu) { |
| 363 |
sprintf(errmsg, "resolution mismatch in recover file \"%s\"", |
| 364 |
oldfile); |
| 365 |
error(USER, errmsg); |
| 366 |
} |
| 367 |
|
| 368 |
scanline = (COLR *)malloc(hresolu*sizeof(COLR)); |
| 369 |
if (scanline == NULL) |
| 370 |
error(SYSTEM, "out of memory in salvage"); |
| 371 |
for (y = 0; y < vresolu; y++) { |
| 372 |
if (freadcolrs(scanline, hresolu, fp) < 0) |
| 373 |
break; |
| 374 |
if (fwritecolrs(scanline, hresolu, stdout) < 0) |
| 375 |
goto writerr; |
| 376 |
} |
| 377 |
if (fflush(stdout) == EOF) |
| 378 |
goto writerr; |
| 379 |
free((char *)scanline); |
| 380 |
fclose(fp); |
| 381 |
unlink(oldfile); |
| 382 |
return(y); |
| 383 |
writerr: |
| 384 |
error(SYSTEM, "write error in salvage"); |
| 385 |
} |
