| 1 |
#ifndef lint
|
| 2 |
static const char RCSid[] = "$Id: mgf_context.c,v 3.3 2023/09/20 21:56:13 greg Exp $";
|
| 3 |
#endif
|
| 4 |
/*
|
| 5 |
* Context handlers
|
| 6 |
*/
|
| 7 |
|
| 8 |
#include <stdio.h>
|
| 9 |
#include <stdlib.h>
|
| 10 |
#include <string.h>
|
| 11 |
#include "mgf_parser.h"
|
| 12 |
#include "lookup.h"
|
| 13 |
|
| 14 |
/* default context values */
|
| 15 |
static C_MATERIAL c_dfmaterial = C_DEFMATERIAL;
|
| 16 |
static C_VERTEX c_dfvertex = C_DEFVERTEX;
|
| 17 |
|
| 18 |
/* the unnamed contexts */
|
| 19 |
static C_COLOR c_uncolor = C_DEFCOLOR;
|
| 20 |
static C_MATERIAL c_unmaterial = C_DEFMATERIAL;
|
| 21 |
static C_VERTEX c_unvertex = C_DEFVERTEX;
|
| 22 |
|
| 23 |
/* the current contexts */
|
| 24 |
C_COLOR *c_ccolor = &c_uncolor;
|
| 25 |
char *c_ccname = NULL;
|
| 26 |
C_MATERIAL *c_cmaterial = &c_unmaterial;
|
| 27 |
char *c_cmname = NULL;
|
| 28 |
C_VERTEX *c_cvertex = &c_unvertex;
|
| 29 |
char *c_cvname = NULL;
|
| 30 |
|
| 31 |
static LUTAB clr_tab = LU_SINIT(free,free); /* color lookup table */
|
| 32 |
static LUTAB mat_tab = LU_SINIT(free,free); /* material lookup table */
|
| 33 |
static LUTAB vtx_tab = LU_SINIT(free,free); /* vertex lookup table */
|
| 34 |
|
| 35 |
static int setspectrum(C_COLOR *, int ac, char **av);
|
| 36 |
|
| 37 |
|
| 38 |
int
|
| 39 |
c_hcolor(int ac, char **av) /* handle color entity */
|
| 40 |
{
|
| 41 |
double w, wsum;
|
| 42 |
int i;
|
| 43 |
LUENT *lp;
|
| 44 |
|
| 45 |
switch (mg_entity(av[0])) {
|
| 46 |
case MG_E_COLOR: /* get/set color context */
|
| 47 |
if (ac > 4)
|
| 48 |
return(MG_EARGC);
|
| 49 |
if (ac == 1) { /* set unnamed color context */
|
| 50 |
c_uncolor = c_dfcolor;
|
| 51 |
c_ccolor = &c_uncolor;
|
| 52 |
c_ccname = NULL;
|
| 53 |
return(MG_OK);
|
| 54 |
}
|
| 55 |
if (!isname(av[1]))
|
| 56 |
return(MG_EILL);
|
| 57 |
lp = lu_find(&clr_tab, av[1]); /* lookup context */
|
| 58 |
if (lp == NULL)
|
| 59 |
return(MG_EMEM);
|
| 60 |
c_ccname = lp->key;
|
| 61 |
c_ccolor = (C_COLOR *)lp->data;
|
| 62 |
if (ac == 2 || (ac == 4 && !strcmp(av[1], av[3]))) {
|
| 63 |
if (c_ccolor == NULL) /* reestablish context */
|
| 64 |
return(MG_EUNDEF);
|
| 65 |
return(MG_OK);
|
| 66 |
}
|
| 67 |
if (av[2][0] != '=' || av[2][1])
|
| 68 |
return(MG_ETYPE);
|
| 69 |
if (c_ccolor == NULL) { /* create new color context */
|
| 70 |
lp->key = (char *)malloc(strlen(av[1])+1);
|
| 71 |
if (lp->key == NULL)
|
| 72 |
return(MG_EMEM);
|
| 73 |
strcpy(lp->key, av[1]);
|
| 74 |
lp->data = (char *)malloc(sizeof(C_COLOR));
|
| 75 |
if (lp->data == NULL)
|
| 76 |
return(MG_EMEM);
|
| 77 |
c_ccname = lp->key;
|
| 78 |
c_ccolor = (C_COLOR *)lp->data;
|
| 79 |
c_ccolor->clock = 0;
|
| 80 |
c_ccolor->client_data = NULL;
|
| 81 |
}
|
| 82 |
i = c_ccolor->clock;
|
| 83 |
if (ac == 3) { /* use default template */
|
| 84 |
*c_ccolor = c_dfcolor;
|
| 85 |
c_ccolor->clock = i + 1;
|
| 86 |
return(MG_OK);
|
| 87 |
}
|
| 88 |
lp = lu_find(&clr_tab, av[3]); /* lookup template */
|
| 89 |
if (lp == NULL)
|
| 90 |
return(MG_EMEM);
|
| 91 |
if (lp->data == NULL)
|
| 92 |
return(MG_EUNDEF);
|
| 93 |
*c_ccolor = *(C_COLOR *)lp->data;
|
| 94 |
c_ccolor->clock = i + 1;
|
| 95 |
return(MG_OK);
|
| 96 |
case MG_E_CXY: /* assign CIE XY value */
|
| 97 |
if (ac != 3)
|
| 98 |
return(MG_EARGC);
|
| 99 |
if (!isflt(av[1]) | !isflt(av[2]))
|
| 100 |
return(MG_ETYPE);
|
| 101 |
c_ccolor->cx = atof(av[1]);
|
| 102 |
c_ccolor->cy = atof(av[2]);
|
| 103 |
c_ccolor->flags = C_CDXY|C_CSXY;
|
| 104 |
if ((c_ccolor->cx < 0.) | (c_ccolor->cy < 0.) |
|
| 105 |
(c_ccolor->cx + c_ccolor->cy > 1.))
|
| 106 |
return(MG_EILL);
|
| 107 |
c_ccolor->clock++;
|
| 108 |
return(MG_OK);
|
| 109 |
case MG_E_CSPEC: /* assign spectral values */
|
| 110 |
return(setspectrum(c_ccolor, ac-1, av+1));
|
| 111 |
case MG_E_CCT: /* assign black body spectrum */
|
| 112 |
if (ac != 2)
|
| 113 |
return(MG_EARGC);
|
| 114 |
if (!isflt(av[1]))
|
| 115 |
return(MG_ETYPE);
|
| 116 |
if (!c_bbtemp(c_ccolor, atof(av[1])))
|
| 117 |
return(MG_EILL);
|
| 118 |
c_ccolor->clock++;
|
| 119 |
return(MG_OK);
|
| 120 |
case MG_E_CMIX: /* mix colors */
|
| 121 |
if (ac < 5 || (ac-1)%2)
|
| 122 |
return(MG_EARGC);
|
| 123 |
if (!isflt(av[1]))
|
| 124 |
return(MG_ETYPE);
|
| 125 |
wsum = atof(av[1]);
|
| 126 |
if ((lp = lu_find(&clr_tab, av[2])) == NULL)
|
| 127 |
return(MG_EMEM);
|
| 128 |
if (lp->data == NULL)
|
| 129 |
return(MG_EUNDEF);
|
| 130 |
*c_ccolor = *(C_COLOR *)lp->data;
|
| 131 |
for (i = 3; i < ac; i += 2) {
|
| 132 |
if (!isflt(av[i]))
|
| 133 |
return(MG_ETYPE);
|
| 134 |
w = atof(av[i]);
|
| 135 |
if ((lp = lu_find(&clr_tab, av[i+1])) == NULL)
|
| 136 |
return(MG_EMEM);
|
| 137 |
if (lp->data == NULL)
|
| 138 |
return(MG_EUNDEF);
|
| 139 |
c_cmix(c_ccolor, wsum, c_ccolor,
|
| 140 |
w, (C_COLOR *)lp->data);
|
| 141 |
wsum += w;
|
| 142 |
}
|
| 143 |
if (wsum <= 0.)
|
| 144 |
return(MG_EILL);
|
| 145 |
c_ccolor->clock++;
|
| 146 |
return(MG_OK);
|
| 147 |
}
|
| 148 |
return(MG_EUNK);
|
| 149 |
}
|
| 150 |
|
| 151 |
|
| 152 |
int
|
| 153 |
c_hmaterial(int ac, char **av) /* handle material entity */
|
| 154 |
{
|
| 155 |
int i;
|
| 156 |
LUENT *lp;
|
| 157 |
|
| 158 |
switch (mg_entity(av[0])) {
|
| 159 |
case MG_E_MATERIAL: /* get/set material context */
|
| 160 |
if (ac > 4)
|
| 161 |
return(MG_EARGC);
|
| 162 |
if (ac == 1) { /* set unnamed material context */
|
| 163 |
c_unmaterial = c_dfmaterial;
|
| 164 |
c_cmaterial = &c_unmaterial;
|
| 165 |
c_cmname = NULL;
|
| 166 |
return(MG_OK);
|
| 167 |
}
|
| 168 |
if (!isname(av[1]))
|
| 169 |
return(MG_EILL);
|
| 170 |
lp = lu_find(&mat_tab, av[1]); /* lookup context */
|
| 171 |
if (lp == NULL)
|
| 172 |
return(MG_EMEM);
|
| 173 |
c_cmname = lp->key;
|
| 174 |
c_cmaterial = (C_MATERIAL *)lp->data;
|
| 175 |
if (ac == 2 || (ac == 4 && !strcmp(av[1], av[3]))) {
|
| 176 |
if (c_cmaterial == NULL) /* reestablish context */
|
| 177 |
return(MG_EUNDEF);
|
| 178 |
return(MG_OK);
|
| 179 |
}
|
| 180 |
if (av[2][0] != '=' || av[2][1])
|
| 181 |
return(MG_ETYPE);
|
| 182 |
if (c_cmaterial == NULL) { /* create new material */
|
| 183 |
lp->key = (char *)malloc(strlen(av[1])+1);
|
| 184 |
if (lp->key == NULL)
|
| 185 |
return(MG_EMEM);
|
| 186 |
strcpy(lp->key, av[1]);
|
| 187 |
lp->data = (char *)malloc(sizeof(C_MATERIAL));
|
| 188 |
if (lp->data == NULL)
|
| 189 |
return(MG_EMEM);
|
| 190 |
c_cmname = lp->key;
|
| 191 |
c_cmaterial = (C_MATERIAL *)lp->data;
|
| 192 |
c_cmaterial->clock = 0;
|
| 193 |
c_cmaterial->client_data = NULL;
|
| 194 |
}
|
| 195 |
i = c_cmaterial->clock;
|
| 196 |
if (ac == 3) { /* use default template */
|
| 197 |
*c_cmaterial = c_dfmaterial;
|
| 198 |
c_cmaterial->clock = i + 1;
|
| 199 |
return(MG_OK);
|
| 200 |
}
|
| 201 |
lp = lu_find(&mat_tab, av[3]); /* lookup template */
|
| 202 |
if (lp == NULL)
|
| 203 |
return(MG_EMEM);
|
| 204 |
if (lp->data == NULL)
|
| 205 |
return(MG_EUNDEF);
|
| 206 |
*c_cmaterial = *(C_MATERIAL *)lp->data;
|
| 207 |
c_cmaterial->clock = i + 1;
|
| 208 |
return(MG_OK);
|
| 209 |
case MG_E_IR: /* set index of refraction */
|
| 210 |
if (ac != 3)
|
| 211 |
return(MG_EARGC);
|
| 212 |
if (!isflt(av[1]) | !isflt(av[2]))
|
| 213 |
return(MG_ETYPE);
|
| 214 |
c_cmaterial->nr = atof(av[1]);
|
| 215 |
c_cmaterial->ni = atof(av[2]);
|
| 216 |
if (c_cmaterial->nr <= FTINY)
|
| 217 |
return(MG_EILL);
|
| 218 |
c_cmaterial->clock++;
|
| 219 |
return(MG_OK);
|
| 220 |
case MG_E_RD: /* set diffuse reflectance */
|
| 221 |
if (ac != 2)
|
| 222 |
return(MG_EARGC);
|
| 223 |
if (!isflt(av[1]))
|
| 224 |
return(MG_ETYPE);
|
| 225 |
c_cmaterial->rd = atof(av[1]);
|
| 226 |
if ((c_cmaterial->rd < 0.) | (c_cmaterial->rd > 1.))
|
| 227 |
return(MG_EILL);
|
| 228 |
c_cmaterial->rd_c = *c_ccolor;
|
| 229 |
c_cmaterial->clock++;
|
| 230 |
return(MG_OK);
|
| 231 |
case MG_E_ED: /* set diffuse emittance */
|
| 232 |
if (ac != 2)
|
| 233 |
return(MG_EARGC);
|
| 234 |
if (!isflt(av[1]))
|
| 235 |
return(MG_ETYPE);
|
| 236 |
c_cmaterial->ed = atof(av[1]);
|
| 237 |
if (c_cmaterial->ed < 0.)
|
| 238 |
return(MG_EILL);
|
| 239 |
c_cmaterial->ed_c = *c_ccolor;
|
| 240 |
c_cmaterial->clock++;
|
| 241 |
return(MG_OK);
|
| 242 |
case MG_E_TD: /* set diffuse transmittance */
|
| 243 |
if (ac != 2)
|
| 244 |
return(MG_EARGC);
|
| 245 |
if (!isflt(av[1]))
|
| 246 |
return(MG_ETYPE);
|
| 247 |
c_cmaterial->td = atof(av[1]);
|
| 248 |
if ((c_cmaterial->td < 0.) | (c_cmaterial->td > 1.))
|
| 249 |
return(MG_EILL);
|
| 250 |
c_cmaterial->td_c = *c_ccolor;
|
| 251 |
c_cmaterial->clock++;
|
| 252 |
return(MG_OK);
|
| 253 |
case MG_E_RS: /* set specular reflectance */
|
| 254 |
if (ac != 3)
|
| 255 |
return(MG_EARGC);
|
| 256 |
if (!isflt(av[1]) | !isflt(av[2]))
|
| 257 |
return(MG_ETYPE);
|
| 258 |
c_cmaterial->rs = atof(av[1]);
|
| 259 |
c_cmaterial->rs_a = atof(av[2]);
|
| 260 |
if ((c_cmaterial->rs < 0.) | (c_cmaterial->rs > 1.) |
|
| 261 |
(c_cmaterial->rs_a < 0.))
|
| 262 |
return(MG_EILL);
|
| 263 |
c_cmaterial->rs_c = *c_ccolor;
|
| 264 |
c_cmaterial->clock++;
|
| 265 |
return(MG_OK);
|
| 266 |
case MG_E_TS: /* set specular transmittance */
|
| 267 |
if (ac != 3)
|
| 268 |
return(MG_EARGC);
|
| 269 |
if (!isflt(av[1]) | !isflt(av[2]))
|
| 270 |
return(MG_ETYPE);
|
| 271 |
c_cmaterial->ts = atof(av[1]);
|
| 272 |
c_cmaterial->ts_a = atof(av[2]);
|
| 273 |
if ((c_cmaterial->ts < 0.) | (c_cmaterial->ts > 1.) |
|
| 274 |
(c_cmaterial->ts_a < 0.))
|
| 275 |
return(MG_EILL);
|
| 276 |
c_cmaterial->ts_c = *c_ccolor;
|
| 277 |
c_cmaterial->clock++;
|
| 278 |
return(MG_OK);
|
| 279 |
case MG_E_SIDES: /* set number of sides */
|
| 280 |
if (ac != 2)
|
| 281 |
return(MG_EARGC);
|
| 282 |
if (!isint(av[1]))
|
| 283 |
return(MG_ETYPE);
|
| 284 |
i = atoi(av[1]);
|
| 285 |
if (i == 1)
|
| 286 |
c_cmaterial->sided = 1;
|
| 287 |
else if (i == 2)
|
| 288 |
c_cmaterial->sided = 0;
|
| 289 |
else
|
| 290 |
return(MG_EILL);
|
| 291 |
c_cmaterial->clock++;
|
| 292 |
return(MG_OK);
|
| 293 |
}
|
| 294 |
return(MG_EUNK);
|
| 295 |
}
|
| 296 |
|
| 297 |
|
| 298 |
int
|
| 299 |
c_hvertex(int ac, char **av) /* handle a vertex entity */
|
| 300 |
{
|
| 301 |
int i;
|
| 302 |
LUENT *lp;
|
| 303 |
|
| 304 |
switch (mg_entity(av[0])) {
|
| 305 |
case MG_E_VERTEX: /* get/set vertex context */
|
| 306 |
if (ac > 4)
|
| 307 |
return(MG_EARGC);
|
| 308 |
if (ac == 1) { /* set unnamed vertex context */
|
| 309 |
c_unvertex = c_dfvertex;
|
| 310 |
c_cvertex = &c_unvertex;
|
| 311 |
c_cvname = NULL;
|
| 312 |
return(MG_OK);
|
| 313 |
}
|
| 314 |
if (!isname(av[1]))
|
| 315 |
return(MG_EILL);
|
| 316 |
lp = lu_find(&vtx_tab, av[1]); /* lookup context */
|
| 317 |
if (lp == NULL)
|
| 318 |
return(MG_EMEM);
|
| 319 |
c_cvname = lp->key;
|
| 320 |
c_cvertex = (C_VERTEX *)lp->data;
|
| 321 |
if (ac == 2 || (ac == 4 && !strcmp(av[1], av[3]))) {
|
| 322 |
if (c_cvertex == NULL) /* reestablish context */
|
| 323 |
return(MG_EUNDEF);
|
| 324 |
return(MG_OK);
|
| 325 |
}
|
| 326 |
if (av[2][0] != '=' || av[2][1])
|
| 327 |
return(MG_ETYPE);
|
| 328 |
if (c_cvertex == NULL) { /* create new vertex context */
|
| 329 |
lp->key = (char *)malloc(strlen(av[1])+1);
|
| 330 |
if (lp->key == NULL)
|
| 331 |
return(MG_EMEM);
|
| 332 |
strcpy(lp->key, av[1]);
|
| 333 |
lp->data = (char *)malloc(sizeof(C_VERTEX));
|
| 334 |
if (lp->data == NULL)
|
| 335 |
return(MG_EMEM);
|
| 336 |
c_cvname = lp->key;
|
| 337 |
c_cvertex = (C_VERTEX *)lp->data;
|
| 338 |
c_cvertex->clock = 0;
|
| 339 |
c_cvertex->client_data = NULL;
|
| 340 |
}
|
| 341 |
i = c_cvertex->clock;
|
| 342 |
if (ac == 3) { /* use default template */
|
| 343 |
*c_cvertex = c_dfvertex;
|
| 344 |
c_cvertex->clock = i + 1;
|
| 345 |
return(MG_OK);
|
| 346 |
}
|
| 347 |
lp = lu_find(&vtx_tab, av[3]); /* lookup template */
|
| 348 |
if (lp == NULL)
|
| 349 |
return(MG_EMEM);
|
| 350 |
if (lp->data == NULL)
|
| 351 |
return(MG_EUNDEF);
|
| 352 |
*c_cvertex = *(C_VERTEX *)lp->data;
|
| 353 |
c_cvertex->clock = i + 1;
|
| 354 |
return(MG_OK);
|
| 355 |
case MG_E_POINT: /* set point */
|
| 356 |
if (ac != 4)
|
| 357 |
return(MG_EARGC);
|
| 358 |
if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3]))
|
| 359 |
return(MG_ETYPE);
|
| 360 |
c_cvertex->p[0] = atof(av[1]);
|
| 361 |
c_cvertex->p[1] = atof(av[2]);
|
| 362 |
c_cvertex->p[2] = atof(av[3]);
|
| 363 |
c_cvertex->clock++;
|
| 364 |
return(MG_OK);
|
| 365 |
case MG_E_NORMAL: /* set normal */
|
| 366 |
if (ac != 4)
|
| 367 |
return(MG_EARGC);
|
| 368 |
if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3]))
|
| 369 |
return(MG_ETYPE);
|
| 370 |
c_cvertex->n[0] = atof(av[1]);
|
| 371 |
c_cvertex->n[1] = atof(av[2]);
|
| 372 |
c_cvertex->n[2] = atof(av[3]);
|
| 373 |
(void)normalize(c_cvertex->n);
|
| 374 |
c_cvertex->clock++;
|
| 375 |
return(MG_OK);
|
| 376 |
}
|
| 377 |
return(MG_EUNK);
|
| 378 |
}
|
| 379 |
|
| 380 |
|
| 381 |
void
|
| 382 |
c_clearall(void) /* empty context tables */
|
| 383 |
{
|
| 384 |
c_uncolor = c_dfcolor;
|
| 385 |
c_ccolor = &c_uncolor;
|
| 386 |
c_ccname = NULL;
|
| 387 |
lu_done(&clr_tab);
|
| 388 |
c_unmaterial = c_dfmaterial;
|
| 389 |
c_cmaterial = &c_unmaterial;
|
| 390 |
c_cmname = NULL;
|
| 391 |
lu_done(&mat_tab);
|
| 392 |
c_unvertex = c_dfvertex;
|
| 393 |
c_cvertex = &c_unvertex;
|
| 394 |
c_cvname = NULL;
|
| 395 |
lu_done(&vtx_tab);
|
| 396 |
}
|
| 397 |
|
| 398 |
|
| 399 |
C_MATERIAL *
|
| 400 |
c_getmaterial(char *name) /* get a named material */
|
| 401 |
{
|
| 402 |
LUENT *lp;
|
| 403 |
|
| 404 |
if ((lp = lu_find(&mat_tab, name)) == NULL)
|
| 405 |
return(NULL);
|
| 406 |
return((C_MATERIAL *)lp->data);
|
| 407 |
}
|
| 408 |
|
| 409 |
|
| 410 |
C_VERTEX *
|
| 411 |
c_getvert(char *name) /* get a named vertex */
|
| 412 |
{
|
| 413 |
LUENT *lp;
|
| 414 |
|
| 415 |
if ((lp = lu_find(&vtx_tab, name)) == NULL)
|
| 416 |
return(NULL);
|
| 417 |
return((C_VERTEX *)lp->data);
|
| 418 |
}
|
| 419 |
|
| 420 |
|
| 421 |
C_COLOR *
|
| 422 |
c_getcolor(char *name) /* get a named color */
|
| 423 |
{
|
| 424 |
LUENT *lp;
|
| 425 |
|
| 426 |
if ((lp = lu_find(&clr_tab, name)) == NULL)
|
| 427 |
return(NULL);
|
| 428 |
return((C_COLOR *)lp->data);
|
| 429 |
}
|
| 430 |
|
| 431 |
|
| 432 |
static int
|
| 433 |
setspectrum( /* convert a spectrum */
|
| 434 |
C_COLOR *clr,
|
| 435 |
int ac,
|
| 436 |
char **av
|
| 437 |
)
|
| 438 |
{
|
| 439 |
double wlmin, wlmax;
|
| 440 |
int i;
|
| 441 |
float *va;
|
| 442 |
/* get bounds */
|
| 443 |
if (ac < 4)
|
| 444 |
return(MG_EARGC);
|
| 445 |
if (!isflt(av[0]) | !isflt(av[1]))
|
| 446 |
return(MG_ETYPE);
|
| 447 |
wlmin = atof(av[0]);
|
| 448 |
wlmax = atof(av[1]);
|
| 449 |
ac -= 2; av += 2;
|
| 450 |
va = (float *)malloc(sizeof(float)*ac);
|
| 451 |
if (va == NULL)
|
| 452 |
return(MG_EMEM);
|
| 453 |
for (i = ac; i--; ) {
|
| 454 |
if (!isflt(av[i]))
|
| 455 |
return(MG_ETYPE);
|
| 456 |
va[i] = atof(av[i]);
|
| 457 |
}
|
| 458 |
if (c_sset(clr, wlmin, wlmax, va, ac) <= FTINY) {
|
| 459 |
free(va);
|
| 460 |
return(MG_EILL);
|
| 461 |
}
|
| 462 |
free(va);
|
| 463 |
clr->clock++;
|
| 464 |
return(MG_OK);
|
| 465 |
}
|
