| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: context.c,v 1.28 2003/07/27 22:12:02 schorsch Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Context handlers |
| 6 |
*/ |
| 7 |
|
| 8 |
#include <stdio.h> |
| 9 |
#include <math.h> |
| 10 |
#include <stdlib.h> |
| 11 |
#include <string.h> |
| 12 |
#include "parser.h" |
| 13 |
#include "lookup.h" |
| 14 |
|
| 15 |
/* default context values */ |
| 16 |
static C_MATERIAL c_dfmaterial = C_DEFMATERIAL; |
| 17 |
static C_VERTEX c_dfvertex = C_DEFVERTEX; |
| 18 |
|
| 19 |
/* the unnamed contexts */ |
| 20 |
static C_COLOR c_uncolor = C_DEFCOLOR; |
| 21 |
static C_MATERIAL c_unmaterial = C_DEFMATERIAL; |
| 22 |
static C_VERTEX c_unvertex = C_DEFVERTEX; |
| 23 |
|
| 24 |
/* the current contexts */ |
| 25 |
C_COLOR *c_ccolor = &c_uncolor; |
| 26 |
char *c_ccname = NULL; |
| 27 |
C_MATERIAL *c_cmaterial = &c_unmaterial; |
| 28 |
char *c_cmname = NULL; |
| 29 |
C_VERTEX *c_cvertex = &c_unvertex; |
| 30 |
char *c_cvname = NULL; |
| 31 |
|
| 32 |
static LUTAB clr_tab = LU_SINIT(free,free); /* color lookup table */ |
| 33 |
static LUTAB mat_tab = LU_SINIT(free,free); /* material lookup table */ |
| 34 |
static LUTAB vtx_tab = LU_SINIT(free,free); /* vertex lookup table */ |
| 35 |
|
| 36 |
static int setspectrum(); |
| 37 |
static int setbbtemp(); |
| 38 |
static void mixcolors(); |
| 39 |
|
| 40 |
|
| 41 |
int |
| 42 |
c_hcolor(ac, av) /* handle color entity */ |
| 43 |
int ac; |
| 44 |
register char **av; |
| 45 |
{ |
| 46 |
double w, wsum; |
| 47 |
register int i; |
| 48 |
register LUENT *lp; |
| 49 |
|
| 50 |
switch (mg_entity(av[0])) { |
| 51 |
case MG_E_COLOR: /* get/set color context */ |
| 52 |
if (ac > 4) |
| 53 |
return(MG_EARGC); |
| 54 |
if (ac == 1) { /* set unnamed color context */ |
| 55 |
c_uncolor = c_dfcolor; |
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c_ccolor = &c_uncolor; |
| 57 |
c_ccname = NULL; |
| 58 |
return(MG_OK); |
| 59 |
} |
| 60 |
if (!isname(av[1])) |
| 61 |
return(MG_EILL); |
| 62 |
lp = lu_find(&clr_tab, av[1]); /* lookup context */ |
| 63 |
if (lp == NULL) |
| 64 |
return(MG_EMEM); |
| 65 |
c_ccname = lp->key; |
| 66 |
c_ccolor = (C_COLOR *)lp->data; |
| 67 |
if (ac == 2) { /* reestablish previous context */ |
| 68 |
if (c_ccolor == NULL) |
| 69 |
return(MG_EUNDEF); |
| 70 |
return(MG_OK); |
| 71 |
} |
| 72 |
if (av[2][0] != '=' || av[2][1]) |
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return(MG_ETYPE); |
| 74 |
if (c_ccolor == NULL) { /* create new color context */ |
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lp->key = (char *)malloc(strlen(av[1])+1); |
| 76 |
if (lp->key == NULL) |
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return(MG_EMEM); |
| 78 |
strcpy(lp->key, av[1]); |
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lp->data = (char *)malloc(sizeof(C_COLOR)); |
| 80 |
if (lp->data == NULL) |
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return(MG_EMEM); |
| 82 |
c_ccname = lp->key; |
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c_ccolor = (C_COLOR *)lp->data; |
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c_ccolor->clock = 0; |
| 85 |
c_ccolor->client_data = NULL; |
| 86 |
} |
| 87 |
i = c_ccolor->clock; |
| 88 |
if (ac == 3) { /* use default template */ |
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*c_ccolor = c_dfcolor; |
| 90 |
c_ccolor->clock = i + 1; |
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return(MG_OK); |
| 92 |
} |
| 93 |
lp = lu_find(&clr_tab, av[3]); /* lookup template */ |
| 94 |
if (lp == NULL) |
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return(MG_EMEM); |
| 96 |
if (lp->data == NULL) |
| 97 |
return(MG_EUNDEF); |
| 98 |
*c_ccolor = *(C_COLOR *)lp->data; |
| 99 |
c_ccolor->clock = i + 1; |
| 100 |
return(MG_OK); |
| 101 |
case MG_E_CXY: /* assign CIE XY value */ |
| 102 |
if (ac != 3) |
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return(MG_EARGC); |
| 104 |
if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
| 106 |
c_ccolor->cx = atof(av[1]); |
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c_ccolor->cy = atof(av[2]); |
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c_ccolor->flags = C_CDXY|C_CSXY; |
| 109 |
if ((c_ccolor->cx < 0.) | (c_ccolor->cy < 0.) | |
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(c_ccolor->cx + c_ccolor->cy > 1.)) |
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return(MG_EILL); |
| 112 |
c_ccolor->clock++; |
| 113 |
return(MG_OK); |
| 114 |
case MG_E_CSPEC: /* assign spectral values */ |
| 115 |
if (ac < 5) |
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return(MG_EARGC); |
| 117 |
if (!isflt(av[1]) | !isflt(av[2])) |
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return(MG_ETYPE); |
| 119 |
return(setspectrum(c_ccolor, atof(av[1]), atof(av[2]), |
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ac-3, av+3)); |
| 121 |
case MG_E_CCT: /* assign black body spectrum */ |
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if (ac != 2) |
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return(MG_EARGC); |
| 124 |
if (!isflt(av[1])) |
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return(MG_ETYPE); |
| 126 |
return(setbbtemp(c_ccolor, atof(av[1]))); |
| 127 |
case MG_E_CMIX: /* mix colors */ |
| 128 |
if (ac < 5 || (ac-1)%2) |
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return(MG_EARGC); |
| 130 |
if (!isflt(av[1])) |
| 131 |
return(MG_ETYPE); |
| 132 |
wsum = atof(av[1]); |
| 133 |
if ((lp = lu_find(&clr_tab, av[2])) == NULL) |
| 134 |
return(MG_EMEM); |
| 135 |
if (lp->data == NULL) |
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return(MG_EUNDEF); |
| 137 |
*c_ccolor = *(C_COLOR *)lp->data; |
| 138 |
for (i = 3; i < ac; i += 2) { |
| 139 |
if (!isflt(av[i])) |
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return(MG_ETYPE); |
| 141 |
w = atof(av[i]); |
| 142 |
if ((lp = lu_find(&clr_tab, av[i+1])) == NULL) |
| 143 |
return(MG_EMEM); |
| 144 |
if (lp->data == NULL) |
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return(MG_EUNDEF); |
| 146 |
mixcolors(c_ccolor, wsum, c_ccolor, |
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w, (C_COLOR *)lp->data); |
| 148 |
wsum += w; |
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} |
| 150 |
if (wsum <= 0.) |
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return(MG_EILL); |
| 152 |
c_ccolor->clock++; |
| 153 |
return(MG_OK); |
| 154 |
} |
| 155 |
return(MG_EUNK); |
| 156 |
} |
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|
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|
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int |
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c_hmaterial(ac, av) /* handle material entity */ |
| 161 |
int ac; |
| 162 |
register char **av; |
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{ |
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int i; |
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register LUENT *lp; |
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|
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switch (mg_entity(av[0])) { |
| 168 |
case MG_E_MATERIAL: /* get/set material context */ |
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if (ac > 4) |
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return(MG_EARGC); |
| 171 |
if (ac == 1) { /* set unnamed material context */ |
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c_unmaterial = c_dfmaterial; |
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c_cmaterial = &c_unmaterial; |
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c_cmname = NULL; |
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return(MG_OK); |
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} |
| 177 |
if (!isname(av[1])) |
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return(MG_EILL); |
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lp = lu_find(&mat_tab, av[1]); /* lookup context */ |
| 180 |
if (lp == NULL) |
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return(MG_EMEM); |
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c_cmname = lp->key; |
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c_cmaterial = (C_MATERIAL *)lp->data; |
| 184 |
if (ac == 2) { /* reestablish previous context */ |
| 185 |
if (c_cmaterial == NULL) |
| 186 |
return(MG_EUNDEF); |
| 187 |
return(MG_OK); |
| 188 |
} |
| 189 |
if (av[2][0] != '=' || av[2][1]) |
| 190 |
return(MG_ETYPE); |
| 191 |
if (c_cmaterial == NULL) { /* create new material */ |
| 192 |
lp->key = (char *)malloc(strlen(av[1])+1); |
| 193 |
if (lp->key == NULL) |
| 194 |
return(MG_EMEM); |
| 195 |
strcpy(lp->key, av[1]); |
| 196 |
lp->data = (char *)malloc(sizeof(C_MATERIAL)); |
| 197 |
if (lp->data == NULL) |
| 198 |
return(MG_EMEM); |
| 199 |
c_cmname = lp->key; |
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c_cmaterial = (C_MATERIAL *)lp->data; |
| 201 |
c_cmaterial->clock = 0; |
| 202 |
c_cmaterial->client_data = NULL; |
| 203 |
} |
| 204 |
i = c_cmaterial->clock; |
| 205 |
if (ac == 3) { /* use default template */ |
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*c_cmaterial = c_dfmaterial; |
| 207 |
c_cmaterial->clock = i + 1; |
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return(MG_OK); |
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} |
| 210 |
lp = lu_find(&mat_tab, av[3]); /* lookup template */ |
| 211 |
if (lp == NULL) |
| 212 |
return(MG_EMEM); |
| 213 |
if (lp->data == NULL) |
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return(MG_EUNDEF); |
| 215 |
*c_cmaterial = *(C_MATERIAL *)lp->data; |
| 216 |
c_cmaterial->clock = i + 1; |
| 217 |
return(MG_OK); |
| 218 |
case MG_E_IR: /* set index of refraction */ |
| 219 |
if (ac != 3) |
| 220 |
return(MG_EARGC); |
| 221 |
if (!isflt(av[1]) | !isflt(av[2])) |
| 222 |
return(MG_ETYPE); |
| 223 |
c_cmaterial->nr = atof(av[1]); |
| 224 |
c_cmaterial->ni = atof(av[2]); |
| 225 |
if (c_cmaterial->nr <= FTINY) |
| 226 |
return(MG_EILL); |
| 227 |
c_cmaterial->clock++; |
| 228 |
return(MG_OK); |
| 229 |
case MG_E_RD: /* set diffuse reflectance */ |
| 230 |
if (ac != 2) |
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return(MG_EARGC); |
| 232 |
if (!isflt(av[1])) |
| 233 |
return(MG_ETYPE); |
| 234 |
c_cmaterial->rd = atof(av[1]); |
| 235 |
if ((c_cmaterial->rd < 0.) | (c_cmaterial->rd > 1.)) |
| 236 |
return(MG_EILL); |
| 237 |
c_cmaterial->rd_c = *c_ccolor; |
| 238 |
c_cmaterial->clock++; |
| 239 |
return(MG_OK); |
| 240 |
case MG_E_ED: /* set diffuse emittance */ |
| 241 |
if (ac != 2) |
| 242 |
return(MG_EARGC); |
| 243 |
if (!isflt(av[1])) |
| 244 |
return(MG_ETYPE); |
| 245 |
c_cmaterial->ed = atof(av[1]); |
| 246 |
if (c_cmaterial->ed < 0.) |
| 247 |
return(MG_EILL); |
| 248 |
c_cmaterial->ed_c = *c_ccolor; |
| 249 |
c_cmaterial->clock++; |
| 250 |
return(MG_OK); |
| 251 |
case MG_E_TD: /* set diffuse transmittance */ |
| 252 |
if (ac != 2) |
| 253 |
return(MG_EARGC); |
| 254 |
if (!isflt(av[1])) |
| 255 |
return(MG_ETYPE); |
| 256 |
c_cmaterial->td = atof(av[1]); |
| 257 |
if ((c_cmaterial->td < 0.) | (c_cmaterial->td > 1.)) |
| 258 |
return(MG_EILL); |
| 259 |
c_cmaterial->td_c = *c_ccolor; |
| 260 |
c_cmaterial->clock++; |
| 261 |
return(MG_OK); |
| 262 |
case MG_E_RS: /* set specular reflectance */ |
| 263 |
if (ac != 3) |
| 264 |
return(MG_EARGC); |
| 265 |
if (!isflt(av[1]) | !isflt(av[2])) |
| 266 |
return(MG_ETYPE); |
| 267 |
c_cmaterial->rs = atof(av[1]); |
| 268 |
c_cmaterial->rs_a = atof(av[2]); |
| 269 |
if ((c_cmaterial->rs < 0.) | (c_cmaterial->rs > 1.) | |
| 270 |
(c_cmaterial->rs_a < 0.)) |
| 271 |
return(MG_EILL); |
| 272 |
c_cmaterial->rs_c = *c_ccolor; |
| 273 |
c_cmaterial->clock++; |
| 274 |
return(MG_OK); |
| 275 |
case MG_E_TS: /* set specular transmittance */ |
| 276 |
if (ac != 3) |
| 277 |
return(MG_EARGC); |
| 278 |
if (!isflt(av[1]) | !isflt(av[2])) |
| 279 |
return(MG_ETYPE); |
| 280 |
c_cmaterial->ts = atof(av[1]); |
| 281 |
c_cmaterial->ts_a = atof(av[2]); |
| 282 |
if ((c_cmaterial->ts < 0.) | (c_cmaterial->ts > 1.) | |
| 283 |
(c_cmaterial->ts_a < 0.)) |
| 284 |
return(MG_EILL); |
| 285 |
c_cmaterial->ts_c = *c_ccolor; |
| 286 |
c_cmaterial->clock++; |
| 287 |
return(MG_OK); |
| 288 |
case MG_E_SIDES: /* set number of sides */ |
| 289 |
if (ac != 2) |
| 290 |
return(MG_EARGC); |
| 291 |
if (!isint(av[1])) |
| 292 |
return(MG_ETYPE); |
| 293 |
i = atoi(av[1]); |
| 294 |
if (i == 1) |
| 295 |
c_cmaterial->sided = 1; |
| 296 |
else if (i == 2) |
| 297 |
c_cmaterial->sided = 0; |
| 298 |
else |
| 299 |
return(MG_EILL); |
| 300 |
c_cmaterial->clock++; |
| 301 |
return(MG_OK); |
| 302 |
} |
| 303 |
return(MG_EUNK); |
| 304 |
} |
| 305 |
|
| 306 |
|
| 307 |
int |
| 308 |
c_hvertex(ac, av) /* handle a vertex entity */ |
| 309 |
int ac; |
| 310 |
register char **av; |
| 311 |
{ |
| 312 |
int i; |
| 313 |
register LUENT *lp; |
| 314 |
|
| 315 |
switch (mg_entity(av[0])) { |
| 316 |
case MG_E_VERTEX: /* get/set vertex context */ |
| 317 |
if (ac > 4) |
| 318 |
return(MG_EARGC); |
| 319 |
if (ac == 1) { /* set unnamed vertex context */ |
| 320 |
c_unvertex = c_dfvertex; |
| 321 |
c_cvertex = &c_unvertex; |
| 322 |
c_cvname = NULL; |
| 323 |
return(MG_OK); |
| 324 |
} |
| 325 |
if (!isname(av[1])) |
| 326 |
return(MG_EILL); |
| 327 |
lp = lu_find(&vtx_tab, av[1]); /* lookup context */ |
| 328 |
if (lp == NULL) |
| 329 |
return(MG_EMEM); |
| 330 |
c_cvname = lp->key; |
| 331 |
c_cvertex = (C_VERTEX *)lp->data; |
| 332 |
if (ac == 2) { /* reestablish previous context */ |
| 333 |
if (c_cvertex == NULL) |
| 334 |
return(MG_EUNDEF); |
| 335 |
return(MG_OK); |
| 336 |
} |
| 337 |
if (av[2][0] != '=' || av[2][1]) |
| 338 |
return(MG_ETYPE); |
| 339 |
if (c_cvertex == NULL) { /* create new vertex context */ |
| 340 |
lp->key = (char *)malloc(strlen(av[1])+1); |
| 341 |
if (lp->key == NULL) |
| 342 |
return(MG_EMEM); |
| 343 |
strcpy(lp->key, av[1]); |
| 344 |
lp->data = (char *)malloc(sizeof(C_VERTEX)); |
| 345 |
if (lp->data == NULL) |
| 346 |
return(MG_EMEM); |
| 347 |
c_cvname = lp->key; |
| 348 |
c_cvertex = (C_VERTEX *)lp->data; |
| 349 |
c_cvertex->clock = 0; |
| 350 |
c_cvertex->client_data = NULL; |
| 351 |
} |
| 352 |
i = c_cvertex->clock; |
| 353 |
if (ac == 3) { /* use default template */ |
| 354 |
*c_cvertex = c_dfvertex; |
| 355 |
c_cvertex->clock = i + 1; |
| 356 |
return(MG_OK); |
| 357 |
} |
| 358 |
lp = lu_find(&vtx_tab, av[3]); /* lookup template */ |
| 359 |
if (lp == NULL) |
| 360 |
return(MG_EMEM); |
| 361 |
if (lp->data == NULL) |
| 362 |
return(MG_EUNDEF); |
| 363 |
*c_cvertex = *(C_VERTEX *)lp->data; |
| 364 |
c_cvertex->clock = i + 1; |
| 365 |
return(MG_OK); |
| 366 |
case MG_E_POINT: /* set point */ |
| 367 |
if (ac != 4) |
| 368 |
return(MG_EARGC); |
| 369 |
if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3])) |
| 370 |
return(MG_ETYPE); |
| 371 |
c_cvertex->p[0] = atof(av[1]); |
| 372 |
c_cvertex->p[1] = atof(av[2]); |
| 373 |
c_cvertex->p[2] = atof(av[3]); |
| 374 |
c_cvertex->clock++; |
| 375 |
return(MG_OK); |
| 376 |
case MG_E_NORMAL: /* set normal */ |
| 377 |
if (ac != 4) |
| 378 |
return(MG_EARGC); |
| 379 |
if (!isflt(av[1]) | !isflt(av[2]) | !isflt(av[3])) |
| 380 |
return(MG_ETYPE); |
| 381 |
c_cvertex->n[0] = atof(av[1]); |
| 382 |
c_cvertex->n[1] = atof(av[2]); |
| 383 |
c_cvertex->n[2] = atof(av[3]); |
| 384 |
(void)normalize(c_cvertex->n); |
| 385 |
c_cvertex->clock++; |
| 386 |
return(MG_OK); |
| 387 |
} |
| 388 |
return(MG_EUNK); |
| 389 |
} |
| 390 |
|
| 391 |
|
| 392 |
void |
| 393 |
c_clearall() /* empty context tables */ |
| 394 |
{ |
| 395 |
c_uncolor = c_dfcolor; |
| 396 |
c_ccolor = &c_uncolor; |
| 397 |
c_ccname = NULL; |
| 398 |
lu_done(&clr_tab); |
| 399 |
c_unmaterial = c_dfmaterial; |
| 400 |
c_cmaterial = &c_unmaterial; |
| 401 |
c_cmname = NULL; |
| 402 |
lu_done(&mat_tab); |
| 403 |
c_unvertex = c_dfvertex; |
| 404 |
c_cvertex = &c_unvertex; |
| 405 |
c_cvname = NULL; |
| 406 |
lu_done(&vtx_tab); |
| 407 |
} |
| 408 |
|
| 409 |
|
| 410 |
C_MATERIAL * |
| 411 |
c_getmaterial(name) /* get a named material */ |
| 412 |
char *name; |
| 413 |
{ |
| 414 |
register LUENT *lp; |
| 415 |
|
| 416 |
if ((lp = lu_find(&mat_tab, name)) == NULL) |
| 417 |
return(NULL); |
| 418 |
return((C_MATERIAL *)lp->data); |
| 419 |
} |
| 420 |
|
| 421 |
|
| 422 |
C_VERTEX * |
| 423 |
c_getvert(name) /* get a named vertex */ |
| 424 |
char *name; |
| 425 |
{ |
| 426 |
register LUENT *lp; |
| 427 |
|
| 428 |
if ((lp = lu_find(&vtx_tab, name)) == NULL) |
| 429 |
return(NULL); |
| 430 |
return((C_VERTEX *)lp->data); |
| 431 |
} |
| 432 |
|
| 433 |
|
| 434 |
C_COLOR * |
| 435 |
c_getcolor(name) /* get a named color */ |
| 436 |
char *name; |
| 437 |
{ |
| 438 |
register LUENT *lp; |
| 439 |
|
| 440 |
if ((lp = lu_find(&clr_tab, name)) == NULL) |
| 441 |
return(NULL); |
| 442 |
return((C_COLOR *)lp->data); |
| 443 |
} |
| 444 |
|
| 445 |
|
| 446 |
static int |
| 447 |
setspectrum(clr, wlmin, wlmax, ac, av) /* convert a spectrum */ |
| 448 |
register C_COLOR *clr; |
| 449 |
double wlmin, wlmax; |
| 450 |
int ac; |
| 451 |
char **av; |
| 452 |
{ |
| 453 |
double scale; |
| 454 |
float va[C_CNSS]; |
| 455 |
register int i, pos; |
| 456 |
int n, imax; |
| 457 |
int wl; |
| 458 |
double wl0, wlstep; |
| 459 |
double boxpos, boxstep; |
| 460 |
/* check bounds */ |
| 461 |
if ((wlmax <= C_CMINWL) | (wlmax <= wlmin) | (wlmin >= C_CMAXWL)) |
| 462 |
return(MG_EILL); |
| 463 |
wlstep = (wlmax - wlmin)/(ac-1); |
| 464 |
while (wlmin < C_CMINWL) { |
| 465 |
wlmin += wlstep; |
| 466 |
ac--; av++; |
| 467 |
} |
| 468 |
while (wlmax > C_CMAXWL) { |
| 469 |
wlmax -= wlstep; |
| 470 |
ac--; |
| 471 |
} |
| 472 |
imax = ac; /* box filter if necessary */ |
| 473 |
boxpos = 0; |
| 474 |
boxstep = 1; |
| 475 |
if (wlstep < C_CWLI) { |
| 476 |
imax = (wlmax - wlmin)/C_CWLI + (1-FTINY); |
| 477 |
boxpos = (wlmin - C_CMINWL)/C_CWLI; |
| 478 |
boxstep = wlstep/C_CWLI; |
| 479 |
wlstep = C_CWLI; |
| 480 |
} |
| 481 |
scale = 0.; /* get values and maximum */ |
| 482 |
pos = 0; |
| 483 |
for (i = 0; i < imax; i++) { |
| 484 |
va[i] = 0.; n = 0; |
| 485 |
while (boxpos < i+.5 && pos < ac) { |
| 486 |
if (!isflt(av[pos])) |
| 487 |
return(MG_ETYPE); |
| 488 |
va[i] += atof(av[pos++]); |
| 489 |
n++; |
| 490 |
boxpos += boxstep; |
| 491 |
} |
| 492 |
if (n > 1) |
| 493 |
va[i] /= (double)n; |
| 494 |
if (va[i] > scale) |
| 495 |
scale = va[i]; |
| 496 |
else if (va[i] < -scale) |
| 497 |
scale = -va[i]; |
| 498 |
} |
| 499 |
if (scale <= FTINY) |
| 500 |
return(MG_EILL); |
| 501 |
scale = C_CMAXV / scale; |
| 502 |
clr->ssum = 0; /* convert to our spacing */ |
| 503 |
wl0 = wlmin; |
| 504 |
pos = 0; |
| 505 |
for (i = 0, wl = C_CMINWL; i < C_CNSS; i++, wl += C_CWLI) |
| 506 |
if ((wl < wlmin) | (wl > wlmax)) |
| 507 |
clr->ssamp[i] = 0; |
| 508 |
else { |
| 509 |
while (wl0 + wlstep < wl+FTINY) { |
| 510 |
wl0 += wlstep; |
| 511 |
pos++; |
| 512 |
} |
| 513 |
if ((wl+FTINY >= wl0) & (wl-FTINY <= wl0)) |
| 514 |
clr->ssamp[i] = scale*va[pos] + .5; |
| 515 |
else /* interpolate if necessary */ |
| 516 |
clr->ssamp[i] = .5 + scale / wlstep * |
| 517 |
( va[pos]*(wl0+wlstep - wl) + |
| 518 |
va[pos+1]*(wl - wl0) ); |
| 519 |
clr->ssum += clr->ssamp[i]; |
| 520 |
} |
| 521 |
clr->flags = C_CDSPEC|C_CSSPEC; |
| 522 |
clr->clock++; |
| 523 |
return(MG_OK); |
| 524 |
} |
| 525 |
|
| 526 |
|
| 527 |
static void |
| 528 |
mixcolors(cres, w1, c1, w2, c2) /* mix two colors according to weights given */ |
| 529 |
register C_COLOR *cres, *c1, *c2; |
| 530 |
double w1, w2; |
| 531 |
{ |
| 532 |
double scale; |
| 533 |
float cmix[C_CNSS]; |
| 534 |
register int i; |
| 535 |
|
| 536 |
if ((c1->flags|c2->flags) & C_CDSPEC) { /* spectral mixing */ |
| 537 |
c_ccvt(c1, C_CSSPEC|C_CSEFF); |
| 538 |
c_ccvt(c2, C_CSSPEC|C_CSEFF); |
| 539 |
w1 /= c1->eff*c1->ssum; |
| 540 |
w2 /= c2->eff*c2->ssum; |
| 541 |
scale = 0.; |
| 542 |
for (i = 0; i < C_CNSS; i++) { |
| 543 |
cmix[i] = w1*c1->ssamp[i] + w2*c2->ssamp[i]; |
| 544 |
if (cmix[i] > scale) |
| 545 |
scale = cmix[i]; |
| 546 |
} |
| 547 |
scale = C_CMAXV / scale; |
| 548 |
cres->ssum = 0; |
| 549 |
for (i = 0; i < C_CNSS; i++) |
| 550 |
cres->ssum += cres->ssamp[i] = scale*cmix[i] + .5; |
| 551 |
cres->flags = C_CDSPEC|C_CSSPEC; |
| 552 |
} else { /* CIE xy mixing */ |
| 553 |
c_ccvt(c1, C_CSXY); |
| 554 |
c_ccvt(c2, C_CSXY); |
| 555 |
scale = w1/c1->cy + w2/c2->cy; |
| 556 |
if (scale == 0.) |
| 557 |
return; |
| 558 |
scale = 1. / scale; |
| 559 |
cres->cx = (c1->cx*w1/c1->cy + c2->cx*w2/c2->cy) * scale; |
| 560 |
cres->cy = (w1 + w2) * scale; |
| 561 |
cres->flags = C_CDXY|C_CSXY; |
| 562 |
} |
| 563 |
} |
| 564 |
|
| 565 |
|
| 566 |
#define C1 3.741832e-16 /* W-m^2 */ |
| 567 |
#define C2 1.4388e-2 /* m-K */ |
| 568 |
|
| 569 |
#define bbsp(l,t) (C1/((l)*(l)*(l)*(l)*(l)*(exp(C2/((t)*(l)))-1.))) |
| 570 |
#define bblm(t) (C2/5./(t)) |
| 571 |
|
| 572 |
static int |
| 573 |
setbbtemp(clr, tk) /* set black body spectrum */ |
| 574 |
register C_COLOR *clr; |
| 575 |
double tk; |
| 576 |
{ |
| 577 |
double sf, wl; |
| 578 |
register int i; |
| 579 |
|
| 580 |
if (tk < 1000) |
| 581 |
return(MG_EILL); |
| 582 |
wl = bblm(tk); /* scalefactor based on peak */ |
| 583 |
if (wl < C_CMINWL*1e-9) |
| 584 |
wl = C_CMINWL*1e-9; |
| 585 |
else if (wl > C_CMAXWL*1e-9) |
| 586 |
wl = C_CMAXWL*1e-9; |
| 587 |
sf = C_CMAXV/bbsp(wl,tk); |
| 588 |
clr->ssum = 0; |
| 589 |
for (i = 0; i < C_CNSS; i++) { |
| 590 |
wl = (C_CMINWL + i*C_CWLI)*1e-9; |
| 591 |
clr->ssum += clr->ssamp[i] = sf*bbsp(wl,tk) + .5; |
| 592 |
} |
| 593 |
clr->flags = C_CDSPEC|C_CSSPEC; |
| 594 |
clr->clock++; |
| 595 |
return(MG_OK); |
| 596 |
} |
| 597 |
|
| 598 |
#undef C1 |
| 599 |
#undef C2 |
| 600 |
#undef bbsp |
| 601 |
#undef bblm |
