| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: rview.c,v 2.27 2005/01/21 00:52:59 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* rview.c - routines and variables for interactive view generation. |
| 6 |
* |
| 7 |
* External symbols declared in rpaint.h |
| 8 |
*/ |
| 9 |
|
| 10 |
#include "copyright.h" |
| 11 |
|
| 12 |
#include <signal.h> |
| 13 |
#include <ctype.h> |
| 14 |
|
| 15 |
#include "ray.h" |
| 16 |
#include "rpaint.h" |
| 17 |
|
| 18 |
|
| 19 |
CUBE thescene; /* our scene */ |
| 20 |
OBJECT nsceneobjs; /* number of objects in our scene */ |
| 21 |
|
| 22 |
int dimlist[MAXDIM]; /* sampling dimensions */ |
| 23 |
int ndims = 0; /* number of sampling dimensions */ |
| 24 |
int samplendx = 0; /* index for this sample */ |
| 25 |
|
| 26 |
extern void ambnotify(); |
| 27 |
void (*addobjnotify[])() = {ambnotify, NULL}; |
| 28 |
|
| 29 |
VIEW ourview = STDVIEW; /* viewing parameters */ |
| 30 |
int hresolu, vresolu; /* image resolution */ |
| 31 |
|
| 32 |
void (*trace)() = NULL; /* trace call */ |
| 33 |
|
| 34 |
int do_irrad = 0; /* compute irradiance? */ |
| 35 |
|
| 36 |
int rand_samp = 0; /* pure Monte Carlo sampling? */ |
| 37 |
|
| 38 |
int psample = 8; /* pixel sample size */ |
| 39 |
double maxdiff = .15; /* max. sample difference */ |
| 40 |
|
| 41 |
double exposure = 1.0; /* exposure for scene */ |
| 42 |
|
| 43 |
double dstrsrc = 0.0; /* square source distribution */ |
| 44 |
double shadthresh = .1; /* shadow threshold */ |
| 45 |
double shadcert = .25; /* shadow certainty */ |
| 46 |
int directrelay = 0; /* number of source relays */ |
| 47 |
int vspretest = 128; /* virtual source pretest density */ |
| 48 |
int directvis = 1; /* sources visible? */ |
| 49 |
double srcsizerat = 0.; /* maximum ratio source size/dist. */ |
| 50 |
|
| 51 |
COLOR cextinction = BLKCOLOR; /* global extinction coefficient */ |
| 52 |
COLOR salbedo = BLKCOLOR; /* global scattering albedo */ |
| 53 |
double seccg = 0.; /* global scattering eccentricity */ |
| 54 |
double ssampdist = 0.; /* scatter sampling distance */ |
| 55 |
|
| 56 |
double specthresh = .3; /* specular sampling threshold */ |
| 57 |
double specjitter = 1.; /* specular sampling jitter */ |
| 58 |
|
| 59 |
int backvis = 1; /* back face visibility */ |
| 60 |
|
| 61 |
int maxdepth = 6; /* maximum recursion depth */ |
| 62 |
double minweight = 1e-2; /* minimum ray weight */ |
| 63 |
|
| 64 |
char *ambfile = NULL; /* ambient file name */ |
| 65 |
COLOR ambval = BLKCOLOR; /* ambient value */ |
| 66 |
int ambvwt = 0; /* initial weight for ambient value */ |
| 67 |
double ambacc = 0.3; /* ambient accuracy */ |
| 68 |
int ambres = 32; /* ambient resolution */ |
| 69 |
int ambdiv = 256; /* ambient divisions */ |
| 70 |
int ambssamp = 64; /* ambient super-samples */ |
| 71 |
int ambounce = 0; /* ambient bounces */ |
| 72 |
char *amblist[AMBLLEN]; /* ambient include/exclude list */ |
| 73 |
int ambincl = -1; /* include == 1, exclude == 0 */ |
| 74 |
|
| 75 |
int greyscale = 0; /* map colors to brightness? */ |
| 76 |
char *dvcname = dev_default; /* output device name */ |
| 77 |
|
| 78 |
struct driver *dev = NULL; /* driver functions */ |
| 79 |
|
| 80 |
char rifname[128]; /* rad input file name */ |
| 81 |
|
| 82 |
VIEW oldview; /* previous view parameters */ |
| 83 |
|
| 84 |
PNODE ptrunk; /* the base of our image */ |
| 85 |
RECT pframe; /* current frame boundaries */ |
| 86 |
int pdepth; /* image depth in current frame */ |
| 87 |
|
| 88 |
static char *reserve_mem = NULL; /* pre-allocated reserve memory */ |
| 89 |
|
| 90 |
#define RESERVE_AMT 32768 /* amount of memory to reserve */ |
| 91 |
|
| 92 |
#define CTRL(c) ((c)-'@') |
| 93 |
|
| 94 |
|
| 95 |
void |
| 96 |
quit(code) /* quit program */ |
| 97 |
int code; |
| 98 |
{ |
| 99 |
#ifdef MSTATS |
| 100 |
if (code == 2 && errno == ENOMEM) |
| 101 |
printmemstats(stderr); |
| 102 |
#endif |
| 103 |
devclose(); |
| 104 |
exit(code); |
| 105 |
} |
| 106 |
|
| 107 |
|
| 108 |
void |
| 109 |
devopen(dname) /* open device driver */ |
| 110 |
char *dname; |
| 111 |
{ |
| 112 |
extern char *progname, *octname; |
| 113 |
char *id; |
| 114 |
register int i; |
| 115 |
|
| 116 |
id = octname!=NULL ? octname : progname; |
| 117 |
/* check device table */ |
| 118 |
for (i = 0; devtable[i].name; i++) |
| 119 |
if (!strcmp(dname, devtable[i].name)) { |
| 120 |
if ((dev = (*devtable[i].init)(dname, id)) == NULL) { |
| 121 |
sprintf(errmsg, "cannot initialize %s", dname); |
| 122 |
error(USER, errmsg); |
| 123 |
} else |
| 124 |
return; |
| 125 |
} |
| 126 |
/* not there, try exec */ |
| 127 |
if ((dev = comm_init(dname, id)) == NULL) { |
| 128 |
sprintf(errmsg, "cannot start device \"%s\"", dname); |
| 129 |
error(USER, errmsg); |
| 130 |
} |
| 131 |
} |
| 132 |
|
| 133 |
|
| 134 |
void |
| 135 |
devclose() /* close our device */ |
| 136 |
{ |
| 137 |
if (dev != NULL) |
| 138 |
(*dev->close)(); |
| 139 |
dev = NULL; |
| 140 |
} |
| 141 |
|
| 142 |
|
| 143 |
void |
| 144 |
printdevices() /* print list of output devices */ |
| 145 |
{ |
| 146 |
register int i; |
| 147 |
|
| 148 |
for (i = 0; devtable[i].name; i++) |
| 149 |
printf("%-16s # %s\n", devtable[i].name, devtable[i].descrip); |
| 150 |
} |
| 151 |
|
| 152 |
|
| 153 |
void |
| 154 |
rview() /* do a view */ |
| 155 |
{ |
| 156 |
char buf[32]; |
| 157 |
|
| 158 |
devopen(dvcname); /* open device */ |
| 159 |
newimage(); /* start image (calls fillreserves) */ |
| 160 |
|
| 161 |
for ( ; ; ) { /* quit in command() */ |
| 162 |
while (hresolu <= 1<<pdepth && vresolu <= 1<<pdepth) |
| 163 |
command("done: "); |
| 164 |
while (reserve_mem == NULL) |
| 165 |
command("out of memory: "); |
| 166 |
errno = 0; |
| 167 |
if (hresolu <= psample<<pdepth && vresolu <= psample<<pdepth) { |
| 168 |
sprintf(buf, "%d sampling...\n", 1<<pdepth); |
| 169 |
(*dev->comout)(buf); |
| 170 |
rsample(); |
| 171 |
} else { |
| 172 |
sprintf(buf, "%d refining...\n", 1<<pdepth); |
| 173 |
(*dev->comout)(buf); |
| 174 |
refine(&ptrunk, 0, 0, hresolu, vresolu, pdepth+1); |
| 175 |
} |
| 176 |
if (errno == ENOMEM) /* ran out of memory */ |
| 177 |
freereserves(); |
| 178 |
else if (dev->inpready) /* noticed some input */ |
| 179 |
command(": "); |
| 180 |
else /* finished this depth */ |
| 181 |
pdepth++; |
| 182 |
} |
| 183 |
} |
| 184 |
|
| 185 |
|
| 186 |
void |
| 187 |
fillreserves() /* fill memory reserves */ |
| 188 |
{ |
| 189 |
if (reserve_mem != NULL) |
| 190 |
return; |
| 191 |
reserve_mem = (char *)malloc(RESERVE_AMT); |
| 192 |
} |
| 193 |
|
| 194 |
|
| 195 |
void |
| 196 |
freereserves() /* free memory reserves */ |
| 197 |
{ |
| 198 |
if (reserve_mem == NULL) |
| 199 |
return; |
| 200 |
free(reserve_mem); |
| 201 |
reserve_mem = NULL; |
| 202 |
} |
| 203 |
|
| 204 |
|
| 205 |
void |
| 206 |
command(prompt) /* get/execute command */ |
| 207 |
char *prompt; |
| 208 |
{ |
| 209 |
#define badcom(s) strncmp(s, inpbuf, args-inpbuf-1) |
| 210 |
char inpbuf[256]; |
| 211 |
char *args; |
| 212 |
again: |
| 213 |
(*dev->comin)(inpbuf, prompt); /* get command + arguments */ |
| 214 |
for (args = inpbuf; *args && *args != ' '; args++) |
| 215 |
; |
| 216 |
if (*args) *args++ = '\0'; |
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else *++args = '\0'; |
| 218 |
|
| 219 |
switch (inpbuf[0]) { |
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case 'f': /* new frame (|focus|free) */ |
| 221 |
if (badcom("frame")) { |
| 222 |
if (badcom("focus")) { |
| 223 |
if (badcom("free")) |
| 224 |
goto commerr; |
| 225 |
free_objmem(); |
| 226 |
break; |
| 227 |
} |
| 228 |
getfocus(args); |
| 229 |
break; |
| 230 |
} |
| 231 |
getframe(args); |
| 232 |
break; |
| 233 |
case 'v': /* view */ |
| 234 |
if (badcom("view")) |
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goto commerr; |
| 236 |
getview(args); |
| 237 |
break; |
| 238 |
case 'l': /* last view */ |
| 239 |
if (badcom("last")) |
| 240 |
goto commerr; |
| 241 |
lastview(args); |
| 242 |
break; |
| 243 |
case 'V': /* save view */ |
| 244 |
if (badcom("V")) |
| 245 |
goto commerr; |
| 246 |
saveview(args); |
| 247 |
break; |
| 248 |
case 'L': /* load view */ |
| 249 |
if (badcom("L")) |
| 250 |
goto commerr; |
| 251 |
loadview(args); |
| 252 |
break; |
| 253 |
case 'e': /* exposure */ |
| 254 |
if (badcom("exposure")) |
| 255 |
goto commerr; |
| 256 |
getexposure(args); |
| 257 |
break; |
| 258 |
case 's': /* set a parameter */ |
| 259 |
if (badcom("set")) { |
| 260 |
#ifdef SIGTSTP |
| 261 |
if (!badcom("stop")) |
| 262 |
goto dostop; |
| 263 |
#endif |
| 264 |
goto commerr; |
| 265 |
} |
| 266 |
setparam(args); |
| 267 |
break; |
| 268 |
case 'n': /* new picture */ |
| 269 |
if (badcom("new")) |
| 270 |
goto commerr; |
| 271 |
newimage(); |
| 272 |
break; |
| 273 |
case 't': /* trace a ray */ |
| 274 |
if (badcom("trace")) |
| 275 |
goto commerr; |
| 276 |
traceray(args); |
| 277 |
break; |
| 278 |
case 'a': /* aim camera */ |
| 279 |
if (badcom("aim")) |
| 280 |
goto commerr; |
| 281 |
getaim(args); |
| 282 |
break; |
| 283 |
case 'm': /* move camera (or memstats) */ |
| 284 |
if (badcom("move")) |
| 285 |
#ifdef MSTATS |
| 286 |
{ |
| 287 |
if (badcom("memory")) |
| 288 |
goto commerr; |
| 289 |
printmemstats(stderr); |
| 290 |
break; |
| 291 |
} |
| 292 |
#else |
| 293 |
goto commerr; |
| 294 |
#endif |
| 295 |
getmove(args); |
| 296 |
break; |
| 297 |
case 'r': /* rotate/repaint */ |
| 298 |
if (badcom("rotate")) { |
| 299 |
if (badcom("repaint")) { |
| 300 |
if (badcom("redraw")) |
| 301 |
goto commerr; |
| 302 |
redraw(); |
| 303 |
break; |
| 304 |
} |
| 305 |
getrepaint(args); |
| 306 |
break; |
| 307 |
} |
| 308 |
getrotate(args); |
| 309 |
break; |
| 310 |
case 'p': /* pivot view */ |
| 311 |
if (badcom("pivot")) { |
| 312 |
if (badcom("pause")) |
| 313 |
goto commerr; |
| 314 |
goto again; |
| 315 |
} |
| 316 |
getpivot(args); |
| 317 |
break; |
| 318 |
case CTRL('R'): /* redraw */ |
| 319 |
redraw(); |
| 320 |
break; |
| 321 |
case 'w': /* write */ |
| 322 |
if (badcom("write")) |
| 323 |
goto commerr; |
| 324 |
writepict(args); |
| 325 |
break; |
| 326 |
case 'q': /* quit */ |
| 327 |
if (badcom("quit")) |
| 328 |
goto commerr; |
| 329 |
quit(0); |
| 330 |
case CTRL('C'): /* interrupt */ |
| 331 |
goto again; |
| 332 |
#ifdef SIGTSTP |
| 333 |
case CTRL('Z'):; /* stop */ |
| 334 |
dostop: |
| 335 |
devclose(); |
| 336 |
kill(0, SIGTSTP); |
| 337 |
/* pc stops here */ |
| 338 |
devopen(dvcname); |
| 339 |
redraw(); |
| 340 |
break; |
| 341 |
#endif |
| 342 |
case '\0': /* continue */ |
| 343 |
break; |
| 344 |
default:; |
| 345 |
commerr: |
| 346 |
if (iscntrl(inpbuf[0])) |
| 347 |
sprintf(errmsg, "^%c: unknown control", |
| 348 |
inpbuf[0]|0100); |
| 349 |
else |
| 350 |
sprintf(errmsg, "%s: unknown command", inpbuf); |
| 351 |
error(COMMAND, errmsg); |
| 352 |
break; |
| 353 |
} |
| 354 |
#undef badcom |
| 355 |
} |
| 356 |
|
| 357 |
|
| 358 |
void |
| 359 |
rsample() /* sample the image */ |
| 360 |
{ |
| 361 |
int xsiz, ysiz, y; |
| 362 |
RECT r; |
| 363 |
PNODE *p; |
| 364 |
register RECT *rl; |
| 365 |
register PNODE **pl; |
| 366 |
register int x; |
| 367 |
/* |
| 368 |
* We initialize the bottom row in the image at our current |
| 369 |
* resolution. During sampling, we check super-pixels to the |
| 370 |
* right and above by calling bigdiff(). If there is a significant |
| 371 |
* difference, we subsample the super-pixels. The testing process |
| 372 |
* includes initialization of the next row. |
| 373 |
*/ |
| 374 |
xsiz = (((long)(pframe.r-pframe.l)<<pdepth)+hresolu-1) / hresolu; |
| 375 |
ysiz = (((long)(pframe.u-pframe.d)<<pdepth)+vresolu-1) / vresolu; |
| 376 |
rl = (RECT *)malloc(xsiz*sizeof(RECT)); |
| 377 |
if (rl == NULL) |
| 378 |
return; |
| 379 |
pl = (PNODE **)malloc(xsiz*sizeof(PNODE *)); |
| 380 |
if (pl == NULL) { |
| 381 |
free((void *)rl); |
| 382 |
return; |
| 383 |
} |
| 384 |
/* |
| 385 |
* Initialize the bottom row. |
| 386 |
*/ |
| 387 |
rl[0].l = rl[0].d = 0; |
| 388 |
rl[0].r = hresolu; rl[0].u = vresolu; |
| 389 |
pl[0] = findrect(pframe.l, pframe.d, &ptrunk, rl, pdepth); |
| 390 |
for (x = 1; x < xsiz; x++) { |
| 391 |
rl[x].l = rl[x].d = 0; |
| 392 |
rl[x].r = hresolu; rl[x].u = vresolu; |
| 393 |
pl[x] = findrect(pframe.l+((x*hresolu)>>pdepth), |
| 394 |
pframe.d, &ptrunk, rl+x, pdepth); |
| 395 |
} |
| 396 |
/* sample the image */ |
| 397 |
for (y = 0; /* y < ysiz */ ; y++) { |
| 398 |
for (x = 0; x < xsiz-1; x++) { |
| 399 |
if (dev->inpready || errno == ENOMEM) |
| 400 |
goto escape; |
| 401 |
/* |
| 402 |
* Test super-pixel to the right. |
| 403 |
*/ |
| 404 |
if (pl[x] != pl[x+1] && bigdiff(pl[x]->v, |
| 405 |
pl[x+1]->v, maxdiff)) { |
| 406 |
refine(pl[x], rl[x].l, rl[x].d, |
| 407 |
rl[x].r, rl[x].u, 1); |
| 408 |
refine(pl[x+1], rl[x+1].l, rl[x+1].d, |
| 409 |
rl[x+1].r, rl[x+1].u, 1); |
| 410 |
} |
| 411 |
} |
| 412 |
if (y >= ysiz-1) |
| 413 |
break; |
| 414 |
for (x = 0; x < xsiz; x++) { |
| 415 |
if (dev->inpready || errno == ENOMEM) |
| 416 |
goto escape; |
| 417 |
/* |
| 418 |
* Find super-pixel at this position in next row. |
| 419 |
*/ |
| 420 |
r.l = r.d = 0; |
| 421 |
r.r = hresolu; r.u = vresolu; |
| 422 |
p = findrect(pframe.l+((x*hresolu)>>pdepth), |
| 423 |
pframe.d+(((y+1)*vresolu)>>pdepth), |
| 424 |
&ptrunk, &r, pdepth); |
| 425 |
/* |
| 426 |
* Test super-pixel in next row. |
| 427 |
*/ |
| 428 |
if (pl[x] != p && bigdiff(pl[x]->v, p->v, maxdiff)) { |
| 429 |
refine(pl[x], rl[x].l, rl[x].d, |
| 430 |
rl[x].r, rl[x].u, 1); |
| 431 |
refine(p, r.l, r.d, r.r, r.u, 1); |
| 432 |
} |
| 433 |
/* |
| 434 |
* Copy into super-pixel array. |
| 435 |
*/ |
| 436 |
rl[x].l = r.l; rl[x].d = r.d; |
| 437 |
rl[x].r = r.r; rl[x].u = r.u; |
| 438 |
pl[x] = p; |
| 439 |
} |
| 440 |
} |
| 441 |
escape: |
| 442 |
free((void *)rl); |
| 443 |
free((void *)pl); |
| 444 |
} |
| 445 |
|
| 446 |
|
| 447 |
int |
| 448 |
refine(p, xmin, ymin, xmax, ymax, pd) /* refine a node */ |
| 449 |
register PNODE *p; |
| 450 |
int xmin, ymin, xmax, ymax; |
| 451 |
int pd; |
| 452 |
{ |
| 453 |
int growth; |
| 454 |
int mx, my; |
| 455 |
int i; |
| 456 |
|
| 457 |
if (dev->inpready) /* quit for input */ |
| 458 |
return(0); |
| 459 |
|
| 460 |
if (pd <= 0) /* depth limit */ |
| 461 |
return(0); |
| 462 |
|
| 463 |
mx = (xmin + xmax) >> 1; |
| 464 |
my = (ymin + ymax) >> 1; |
| 465 |
growth = 0; |
| 466 |
|
| 467 |
if (p->kid == NULL) { /* subdivide */ |
| 468 |
|
| 469 |
if ((p->kid = newptree()) == NULL) |
| 470 |
return(0); |
| 471 |
/* |
| 472 |
* The following paint order can leave a black pixel |
| 473 |
* if redraw() is called in (*dev->paintr)(). |
| 474 |
*/ |
| 475 |
if (p->x >= mx && p->y >= my) |
| 476 |
pcopy(p, p->kid+UR); |
| 477 |
else |
| 478 |
paint(p->kid+UR, mx, my, xmax, ymax); |
| 479 |
if (p->x < mx && p->y >= my) |
| 480 |
pcopy(p, p->kid+UL); |
| 481 |
else |
| 482 |
paint(p->kid+UL, xmin, my, mx, ymax); |
| 483 |
if (p->x >= mx && p->y < my) |
| 484 |
pcopy(p, p->kid+DR); |
| 485 |
else |
| 486 |
paint(p->kid+DR, mx, ymin, xmax, my); |
| 487 |
if (p->x < mx && p->y < my) |
| 488 |
pcopy(p, p->kid+DL); |
| 489 |
else |
| 490 |
paint(p->kid+DL, xmin, ymin, mx, my); |
| 491 |
|
| 492 |
growth++; |
| 493 |
} |
| 494 |
/* do children */ |
| 495 |
if (mx > pframe.l) { |
| 496 |
if (my > pframe.d) |
| 497 |
growth += refine(p->kid+DL, xmin, ymin, mx, my, pd-1); |
| 498 |
if (my < pframe.u) |
| 499 |
growth += refine(p->kid+UL, xmin, my, mx, ymax, pd-1); |
| 500 |
} |
| 501 |
if (mx < pframe.r) { |
| 502 |
if (my > pframe.d) |
| 503 |
growth += refine(p->kid+DR, mx, ymin, xmax, my, pd-1); |
| 504 |
if (my < pframe.u) |
| 505 |
growth += refine(p->kid+UR, mx, my, xmax, ymax, pd-1); |
| 506 |
} |
| 507 |
/* recompute sum */ |
| 508 |
if (growth) { |
| 509 |
setcolor(p->v, 0.0, 0.0, 0.0); |
| 510 |
for (i = 0; i < 4; i++) |
| 511 |
addcolor(p->v, p->kid[i].v); |
| 512 |
scalecolor(p->v, 0.25); |
| 513 |
} |
| 514 |
return(growth); |
| 515 |
} |
