| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: bsdfrep.c,v 2.37 2021/12/15 01:38:50 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Support BSDF representation as radial basis functions. |
| 6 |
* |
| 7 |
* G. Ward |
| 8 |
*/ |
| 9 |
|
| 10 |
#define _USE_MATH_DEFINES |
| 11 |
#include <stdlib.h> |
| 12 |
#include <math.h> |
| 13 |
#include "rtio.h" |
| 14 |
#include "resolu.h" |
| 15 |
#include "bsdfrep.h" |
| 16 |
#include "random.h" |
| 17 |
/* name and manufacturer if known */ |
| 18 |
char bsdf_name[256]; |
| 19 |
char bsdf_manuf[256]; |
| 20 |
/* active grid resolution */ |
| 21 |
int grid_res = GRIDRES; |
| 22 |
|
| 23 |
/* coverage/symmetry using INP_QUAD? flags */ |
| 24 |
int inp_coverage = 0; |
| 25 |
/* all incident angles in-plane so far? */ |
| 26 |
int single_plane_incident = -1; |
| 27 |
|
| 28 |
/* input/output orientations */ |
| 29 |
int input_orient = 0; |
| 30 |
int output_orient = 0; |
| 31 |
|
| 32 |
/* represented color space */ |
| 33 |
RBColor rbf_colorimetry = RBCunknown; |
| 34 |
|
| 35 |
const char *RBCident[] = { |
| 36 |
"CIE-Y", "CIE-XYZ", "Spectral", "Unknown" |
| 37 |
}; |
| 38 |
|
| 39 |
/* BSDF histogram */ |
| 40 |
unsigned long bsdf_hist[HISTLEN]; |
| 41 |
|
| 42 |
/* BSDF value for boundary regions */ |
| 43 |
double bsdf_min = 0; |
| 44 |
double bsdf_spec_val = 0; |
| 45 |
double bsdf_spec_rad = 0; |
| 46 |
|
| 47 |
/* processed incident DSF measurements */ |
| 48 |
RBFNODE *dsf_list = NULL; |
| 49 |
|
| 50 |
/* RBF-linking matrices (edges) */ |
| 51 |
MIGRATION *mig_list = NULL; |
| 52 |
|
| 53 |
/* current input direction */ |
| 54 |
double theta_in_deg, phi_in_deg; |
| 55 |
|
| 56 |
/* header line sharing callback */ |
| 57 |
int (*sir_headshare)(char *s) = NULL; |
| 58 |
|
| 59 |
/* Register new input direction */ |
| 60 |
int |
| 61 |
new_input_direction(double new_theta, double new_phi) |
| 62 |
{ |
| 63 |
/* normalize angle ranges */ |
| 64 |
while (new_theta < -180.) |
| 65 |
new_theta += 360.; |
| 66 |
while (new_theta > 180.) |
| 67 |
new_theta -= 360.; |
| 68 |
if (new_theta < 0) { |
| 69 |
new_theta = -new_theta; |
| 70 |
new_phi += 180.; |
| 71 |
} |
| 72 |
while (new_phi < 0) |
| 73 |
new_phi += 360.; |
| 74 |
while (new_phi >= 360.) |
| 75 |
new_phi -= 360.; |
| 76 |
/* check input orientation */ |
| 77 |
if (!input_orient) |
| 78 |
input_orient = 1 - 2*(new_theta > 90.); |
| 79 |
else if (input_orient > 0 ^ new_theta < 90.) { |
| 80 |
fprintf(stderr, |
| 81 |
"%s: Cannot handle input angles on both sides of surface\n", |
| 82 |
progname); |
| 83 |
return(0); |
| 84 |
} |
| 85 |
if ((theta_in_deg = new_theta) < 1.0) |
| 86 |
return(1); /* don't rely on phi near normal */ |
| 87 |
if (single_plane_incident > 0) /* check input coverage */ |
| 88 |
single_plane_incident = (round(new_phi) == round(phi_in_deg)); |
| 89 |
else if (single_plane_incident < 0) |
| 90 |
single_plane_incident = 1; |
| 91 |
phi_in_deg = new_phi; |
| 92 |
if ((1. < new_phi) & (new_phi < 89.)) |
| 93 |
inp_coverage |= INP_QUAD1; |
| 94 |
else if ((91. < new_phi) & (new_phi < 179.)) |
| 95 |
inp_coverage |= INP_QUAD2; |
| 96 |
else if ((181. < new_phi) & (new_phi < 269.)) |
| 97 |
inp_coverage |= INP_QUAD3; |
| 98 |
else if ((271. < new_phi) & (new_phi < 359.)) |
| 99 |
inp_coverage |= INP_QUAD4; |
| 100 |
return(1); |
| 101 |
} |
| 102 |
|
| 103 |
/* Apply symmetry to the given vector based on distribution */ |
| 104 |
int |
| 105 |
use_symmetry(FVECT vec) |
| 106 |
{ |
| 107 |
double phi = get_phi360(vec); |
| 108 |
/* because of -0. issue */ |
| 109 |
while (phi >= 360.) phi -= 360.; |
| 110 |
while (phi < 0.) phi += 360.; |
| 111 |
|
| 112 |
switch (inp_coverage) { |
| 113 |
case INP_QUAD1|INP_QUAD2|INP_QUAD3|INP_QUAD4: |
| 114 |
break; |
| 115 |
case INP_QUAD1|INP_QUAD2: |
| 116 |
if ((-FTINY > phi) | (phi > 180.+FTINY)) |
| 117 |
goto mir_y; |
| 118 |
break; |
| 119 |
case INP_QUAD2|INP_QUAD3: |
| 120 |
if ((90.-FTINY > phi) | (phi > 270.+FTINY)) |
| 121 |
goto mir_x; |
| 122 |
break; |
| 123 |
case INP_QUAD3|INP_QUAD4: |
| 124 |
if ((180.-FTINY > phi) | (phi > 360.+FTINY)) |
| 125 |
goto mir_y; |
| 126 |
break; |
| 127 |
case INP_QUAD4|INP_QUAD1: |
| 128 |
if ((270.-FTINY > phi) & (phi > 90.+FTINY)) |
| 129 |
goto mir_x; |
| 130 |
break; |
| 131 |
case INP_QUAD1: |
| 132 |
if ((-FTINY > phi) | (phi > 90.+FTINY)) |
| 133 |
switch ((int)(phi*(1./90.))) { |
| 134 |
case 1: goto mir_x; |
| 135 |
case 2: goto mir_xy; |
| 136 |
case 3: goto mir_y; |
| 137 |
} |
| 138 |
break; |
| 139 |
case INP_QUAD2: |
| 140 |
if ((90.-FTINY > phi) | (phi > 180.+FTINY)) |
| 141 |
switch ((int)(phi*(1./90.))) { |
| 142 |
case 0: goto mir_x; |
| 143 |
case 2: goto mir_y; |
| 144 |
case 3: goto mir_xy; |
| 145 |
} |
| 146 |
break; |
| 147 |
case INP_QUAD3: |
| 148 |
if ((180.-FTINY > phi) | (phi > 270.+FTINY)) |
| 149 |
switch ((int)(phi*(1./90.))) { |
| 150 |
case 0: goto mir_xy; |
| 151 |
case 1: goto mir_y; |
| 152 |
case 3: goto mir_x; |
| 153 |
} |
| 154 |
break; |
| 155 |
case INP_QUAD4: |
| 156 |
if ((270.-FTINY > phi) | (phi > 360.+FTINY)) |
| 157 |
switch ((int)(phi*(1./90.))) { |
| 158 |
case 0: goto mir_y; |
| 159 |
case 1: goto mir_xy; |
| 160 |
case 2: goto mir_x; |
| 161 |
} |
| 162 |
break; |
| 163 |
default: |
| 164 |
fprintf(stderr, "%s: Illegal input coverage (%d)\n", |
| 165 |
progname, inp_coverage); |
| 166 |
exit(1); |
| 167 |
} |
| 168 |
return(0); /* in range */ |
| 169 |
mir_x: |
| 170 |
vec[0] = -vec[0]; |
| 171 |
return(MIRROR_X); |
| 172 |
mir_y: |
| 173 |
vec[1] = -vec[1]; |
| 174 |
return(MIRROR_Y); |
| 175 |
mir_xy: |
| 176 |
vec[0] = -vec[0]; |
| 177 |
vec[1] = -vec[1]; |
| 178 |
return(MIRROR_X|MIRROR_Y); |
| 179 |
} |
| 180 |
|
| 181 |
/* Reverse symmetry based on what was done before */ |
| 182 |
void |
| 183 |
rev_symmetry(FVECT vec, int sym) |
| 184 |
{ |
| 185 |
if (sym & MIRROR_X) |
| 186 |
vec[0] = -vec[0]; |
| 187 |
if (sym & MIRROR_Y) |
| 188 |
vec[1] = -vec[1]; |
| 189 |
} |
| 190 |
|
| 191 |
/* Reverse symmetry for an RBF distribution */ |
| 192 |
void |
| 193 |
rev_rbf_symmetry(RBFNODE *rbf, int sym) |
| 194 |
{ |
| 195 |
int n; |
| 196 |
|
| 197 |
rev_symmetry(rbf->invec, sym); |
| 198 |
if (sym & MIRROR_X) |
| 199 |
for (n = rbf->nrbf; n-- > 0; ) |
| 200 |
rbf->rbfa[n].gx = grid_res-1 - rbf->rbfa[n].gx; |
| 201 |
if (sym & MIRROR_Y) |
| 202 |
for (n = rbf->nrbf; n-- > 0; ) |
| 203 |
rbf->rbfa[n].gy = grid_res-1 - rbf->rbfa[n].gy; |
| 204 |
} |
| 205 |
|
| 206 |
/* Rotate RBF to correspond to given incident vector */ |
| 207 |
void |
| 208 |
rotate_rbf(RBFNODE *rbf, const FVECT invec) |
| 209 |
{ |
| 210 |
static const FVECT vnorm = {.0, .0, 1.}; |
| 211 |
const double phi = atan2(invec[1],invec[0]) - |
| 212 |
atan2(rbf->invec[1],rbf->invec[0]); |
| 213 |
FVECT outvec; |
| 214 |
int pos[2]; |
| 215 |
int n; |
| 216 |
|
| 217 |
for (n = (cos(phi) < 1.-FTINY)*rbf->nrbf; n-- > 0; ) { |
| 218 |
ovec_from_pos(outvec, rbf->rbfa[n].gx, rbf->rbfa[n].gy); |
| 219 |
spinvector(outvec, outvec, vnorm, phi); |
| 220 |
pos_from_vec(pos, outvec); |
| 221 |
rbf->rbfa[n].gx = pos[0]; |
| 222 |
rbf->rbfa[n].gy = pos[1]; |
| 223 |
} |
| 224 |
VCOPY(rbf->invec, invec); |
| 225 |
} |
| 226 |
|
| 227 |
/* Compute outgoing vector from grid position */ |
| 228 |
#if 1 |
| 229 |
void |
| 230 |
ovec_from_pos(FVECT vec, int xpos, int ypos) |
| 231 |
{ /* precomputed table version */ |
| 232 |
static int qsiz = 0; |
| 233 |
static float (*q_uv)[2] = NULL; |
| 234 |
|
| 235 |
if (vec == NULL) { /* just free table? */ |
| 236 |
if (q_uv) free(q_uv); |
| 237 |
qsiz = 0; |
| 238 |
return; |
| 239 |
} |
| 240 |
if (qsiz != grid_res>>1) { |
| 241 |
int x, y; /* (re)make positive quadrant table */ |
| 242 |
RREAL uv[2]; |
| 243 |
double r; |
| 244 |
if (q_uv) free(q_uv); |
| 245 |
qsiz = grid_res>>1; |
| 246 |
q_uv = (float (*)[2])malloc(sizeof(float)*2*qsiz*qsiz); |
| 247 |
for (y = qsiz; y--; ) |
| 248 |
for (x = qsiz; x--; ) { |
| 249 |
square2disk(uv, 0.5 + (x+.5)/grid_res, |
| 250 |
0.5 + (y+.5)/grid_res); |
| 251 |
/* uniform hemispherical projection */ |
| 252 |
r = sqrt(2. - uv[0]*uv[0] - uv[1]*uv[1]); |
| 253 |
q_uv[qsiz*y + x][0] = (float)(r*uv[0]); |
| 254 |
q_uv[qsiz*y + x][1] = (float)(r*uv[1]); |
| 255 |
} |
| 256 |
} |
| 257 |
/* put in positive quadrant */ |
| 258 |
if (xpos >= qsiz) { xpos -= qsiz; vec[0] = 1.; } |
| 259 |
else { xpos = qsiz-1 - xpos; vec[0] = -1.; } |
| 260 |
if (ypos >= qsiz) { ypos -= qsiz; vec[1] = 1.; } |
| 261 |
else { ypos = qsiz-1 - ypos; vec[1] = -1.; } |
| 262 |
|
| 263 |
vec[0] *= (RREAL)q_uv[qsiz*ypos + xpos][0]; |
| 264 |
vec[1] *= (RREAL)q_uv[qsiz*ypos + xpos][1]; |
| 265 |
vec[2] = output_orient*sqrt(1. - vec[0]*vec[0] - vec[1]*vec[1]); |
| 266 |
} |
| 267 |
#else |
| 268 |
void |
| 269 |
ovec_from_pos(FVECT vec, int xpos, int ypos) |
| 270 |
{ /* table-free version */ |
| 271 |
RREAL uv[2]; |
| 272 |
double r2; |
| 273 |
|
| 274 |
if (vec == NULL) |
| 275 |
return; |
| 276 |
|
| 277 |
square2disk(uv, (xpos+.5)/grid_res, (ypos+.5)/grid_res); |
| 278 |
/* uniform hemispherical projection */ |
| 279 |
r2 = uv[0]*uv[0] + uv[1]*uv[1]; |
| 280 |
vec[0] = vec[1] = sqrt(2. - r2); |
| 281 |
vec[0] *= uv[0]; |
| 282 |
vec[1] *= uv[1]; |
| 283 |
vec[2] = output_orient*(1. - r2); |
| 284 |
} |
| 285 |
#endif |
| 286 |
|
| 287 |
/* Compute grid position from normalized input/output vector */ |
| 288 |
void |
| 289 |
pos_from_vec(int pos[2], const FVECT vec) |
| 290 |
{ |
| 291 |
RREAL sq[2]; /* uniform hemispherical projection */ |
| 292 |
double norm = 1./sqrt(1. + fabs(vec[2])); |
| 293 |
|
| 294 |
disk2square(sq, vec[0]*norm, vec[1]*norm); |
| 295 |
|
| 296 |
pos[0] = (int)(sq[0]*grid_res); |
| 297 |
pos[1] = (int)(sq[1]*grid_res); |
| 298 |
} |
| 299 |
|
| 300 |
/* Compute volume associated with Gaussian lobe */ |
| 301 |
double |
| 302 |
rbf_volume(const RBFVAL *rbfp) |
| 303 |
{ |
| 304 |
double rad = R2ANG(rbfp->crad); |
| 305 |
FVECT odir; |
| 306 |
double elev, integ; |
| 307 |
/* infinite integral approximation */ |
| 308 |
integ = (2.*M_PI) * rbfp->peak * rad*rad; |
| 309 |
/* check if we're near horizon */ |
| 310 |
ovec_from_pos(odir, rbfp->gx, rbfp->gy); |
| 311 |
elev = output_orient*odir[2]; |
| 312 |
/* apply cut-off correction if > 1% */ |
| 313 |
if (elev < 2.8*rad) { |
| 314 |
/* elev = asin(elev); /* this is so crude, anyway... */ |
| 315 |
integ *= 1. - .5*exp(-.5*elev*elev/(rad*rad)); |
| 316 |
} |
| 317 |
return(integ); |
| 318 |
} |
| 319 |
|
| 320 |
/* Evaluate BSDF at the given normalized outgoing direction in color */ |
| 321 |
SDError |
| 322 |
eval_rbfcol(SDValue *sv, const RBFNODE *rp, const FVECT outvec) |
| 323 |
{ |
| 324 |
const double rfact2 = (38./M_PI/M_PI)*(grid_res*grid_res); |
| 325 |
int pos[2]; |
| 326 |
double res = 0; |
| 327 |
double usum = 0, vsum = 0; |
| 328 |
const RBFVAL *rbfp; |
| 329 |
FVECT odir; |
| 330 |
double rad2; |
| 331 |
int n; |
| 332 |
/* assign default value */ |
| 333 |
sv->spec = c_dfcolor; |
| 334 |
sv->cieY = bsdf_min; |
| 335 |
/* check for wrong side */ |
| 336 |
if (outvec[2] > 0 ^ output_orient > 0) { |
| 337 |
strcpy(SDerrorDetail, "Wrong-side scattering query"); |
| 338 |
return(SDEargument); |
| 339 |
} |
| 340 |
if (rp == NULL) /* return minimum if no information avail. */ |
| 341 |
return(SDEnone); |
| 342 |
/* optimization for fast lobe culling */ |
| 343 |
pos_from_vec(pos, outvec); |
| 344 |
/* sum radial basis function */ |
| 345 |
rbfp = rp->rbfa; |
| 346 |
for (n = rp->nrbf; n--; rbfp++) { |
| 347 |
int d2 = (pos[0]-rbfp->gx)*(pos[0]-rbfp->gx) + |
| 348 |
(pos[1]-rbfp->gy)*(pos[1]-rbfp->gy); |
| 349 |
double val; |
| 350 |
rad2 = R2ANG(rbfp->crad); |
| 351 |
rad2 *= rad2; |
| 352 |
if (d2 > rad2*rfact2) |
| 353 |
continue; |
| 354 |
ovec_from_pos(odir, rbfp->gx, rbfp->gy); |
| 355 |
val = rbfp->peak * exp((DOT(odir,outvec) - 1.) / rad2); |
| 356 |
if (rbf_colorimetry == RBCtristimulus) { |
| 357 |
usum += val * (rbfp->chroma & 0xff); |
| 358 |
vsum += val * (rbfp->chroma>>8 & 0xff); |
| 359 |
} |
| 360 |
res += val; |
| 361 |
} |
| 362 |
sv->cieY = res / COSF(outvec[2]); |
| 363 |
if (sv->cieY < bsdf_min) { /* never return less than bsdf_min */ |
| 364 |
sv->cieY = bsdf_min; |
| 365 |
} else if (rbf_colorimetry == RBCtristimulus) { |
| 366 |
C_CHROMA cres = (int)(usum/res + frandom()); |
| 367 |
cres |= (int)(vsum/res + frandom()) << 8; |
| 368 |
c_decodeChroma(&sv->spec, cres); |
| 369 |
} |
| 370 |
return(SDEnone); |
| 371 |
} |
| 372 |
|
| 373 |
/* Evaluate BSDF at the given normalized outgoing direction in Y */ |
| 374 |
double |
| 375 |
eval_rbfrep(const RBFNODE *rp, const FVECT outvec) |
| 376 |
{ |
| 377 |
SDValue sv; |
| 378 |
|
| 379 |
if (eval_rbfcol(&sv, rp, outvec) == SDEnone) |
| 380 |
return(sv.cieY); |
| 381 |
|
| 382 |
return(0.0); |
| 383 |
} |
| 384 |
|
| 385 |
/* Insert a new directional scattering function in our global list */ |
| 386 |
int |
| 387 |
insert_dsf(RBFNODE *newrbf) |
| 388 |
{ |
| 389 |
RBFNODE *rbf, *rbf_last; |
| 390 |
int pos; |
| 391 |
/* check for redundant meas. */ |
| 392 |
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) |
| 393 |
if (DOT(rbf->invec, newrbf->invec) >= 1.-FTINY) { |
| 394 |
fprintf(stderr, |
| 395 |
"%s: Duplicate incident measurement ignored at (%.1f,%.1f)\n", |
| 396 |
progname, get_theta180(newrbf->invec), |
| 397 |
get_phi360(newrbf->invec)); |
| 398 |
free(newrbf); |
| 399 |
return(-1); |
| 400 |
} |
| 401 |
/* keep in ascending theta order */ |
| 402 |
for (rbf_last = NULL, rbf = dsf_list; rbf != NULL; |
| 403 |
rbf_last = rbf, rbf = rbf->next) |
| 404 |
if (single_plane_incident && input_orient*rbf->invec[2] < |
| 405 |
input_orient*newrbf->invec[2]) |
| 406 |
break; |
| 407 |
if (rbf_last == NULL) { /* insert new node in list */ |
| 408 |
newrbf->ord = 0; |
| 409 |
newrbf->next = dsf_list; |
| 410 |
dsf_list = newrbf; |
| 411 |
} else { |
| 412 |
newrbf->ord = rbf_last->ord + 1; |
| 413 |
newrbf->next = rbf; |
| 414 |
rbf_last->next = newrbf; |
| 415 |
} |
| 416 |
rbf_last = newrbf; |
| 417 |
while (rbf != NULL) { /* update ordinal positions */ |
| 418 |
rbf->ord = rbf_last->ord + 1; |
| 419 |
rbf_last = rbf; |
| 420 |
rbf = rbf->next; |
| 421 |
} |
| 422 |
return(newrbf->ord); |
| 423 |
} |
| 424 |
|
| 425 |
/* Get the DSF indicated by its ordinal position */ |
| 426 |
RBFNODE * |
| 427 |
get_dsf(int ord) |
| 428 |
{ |
| 429 |
RBFNODE *rbf; |
| 430 |
|
| 431 |
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) |
| 432 |
if (rbf->ord == ord) |
| 433 |
return(rbf); |
| 434 |
return(NULL); |
| 435 |
} |
| 436 |
|
| 437 |
/* Get triangle surface orientation (unnormalized) */ |
| 438 |
void |
| 439 |
tri_orient(FVECT vres, const FVECT v1, const FVECT v2, const FVECT v3) |
| 440 |
{ |
| 441 |
FVECT v2minus1, v3minus2; |
| 442 |
|
| 443 |
VSUB(v2minus1, v2, v1); |
| 444 |
VSUB(v3minus2, v3, v2); |
| 445 |
VCROSS(vres, v2minus1, v3minus2); |
| 446 |
} |
| 447 |
|
| 448 |
/* Determine if vertex order is reversed (inward normal) */ |
| 449 |
int |
| 450 |
is_rev_tri(const FVECT v1, const FVECT v2, const FVECT v3) |
| 451 |
{ |
| 452 |
FVECT tor; |
| 453 |
|
| 454 |
tri_orient(tor, v1, v2, v3); |
| 455 |
|
| 456 |
return(DOT(tor, v2) < 0.); |
| 457 |
} |
| 458 |
|
| 459 |
/* Find vertices completing triangles on either side of the given edge */ |
| 460 |
int |
| 461 |
get_triangles(RBFNODE *rbfv[2], const MIGRATION *mig) |
| 462 |
{ |
| 463 |
const MIGRATION *ej1, *ej2; |
| 464 |
RBFNODE *tv; |
| 465 |
|
| 466 |
rbfv[0] = rbfv[1] = NULL; |
| 467 |
if (mig == NULL) |
| 468 |
return(0); |
| 469 |
for (ej1 = mig->rbfv[0]->ejl; ej1 != NULL; |
| 470 |
ej1 = nextedge(mig->rbfv[0],ej1)) { |
| 471 |
if (ej1 == mig) |
| 472 |
continue; |
| 473 |
tv = opp_rbf(mig->rbfv[0],ej1); |
| 474 |
for (ej2 = tv->ejl; ej2 != NULL; ej2 = nextedge(tv,ej2)) |
| 475 |
if (opp_rbf(tv,ej2) == mig->rbfv[1]) { |
| 476 |
rbfv[is_rev_tri(mig->rbfv[0]->invec, |
| 477 |
mig->rbfv[1]->invec, |
| 478 |
tv->invec)] = tv; |
| 479 |
break; |
| 480 |
} |
| 481 |
} |
| 482 |
return((rbfv[0] != NULL) + (rbfv[1] != NULL)); |
| 483 |
} |
| 484 |
|
| 485 |
/* Return single-lobe specular RBF for the given incident direction */ |
| 486 |
RBFNODE * |
| 487 |
def_rbf_spec(const FVECT invec) |
| 488 |
{ |
| 489 |
RBFNODE *rbf; |
| 490 |
FVECT ovec; |
| 491 |
int pos[2]; |
| 492 |
|
| 493 |
if (input_orient > 0 ^ invec[2] > 0) /* wrong side? */ |
| 494 |
return(NULL); |
| 495 |
if ((bsdf_spec_val <= bsdf_min) | (bsdf_spec_rad <= 0)) |
| 496 |
return(NULL); /* nothing set */ |
| 497 |
rbf = (RBFNODE *)malloc(sizeof(RBFNODE)); |
| 498 |
if (rbf == NULL) |
| 499 |
return(NULL); |
| 500 |
ovec[0] = -invec[0]; |
| 501 |
ovec[1] = -invec[1]; |
| 502 |
ovec[2] = invec[2]*(2*(input_orient==output_orient) - 1); |
| 503 |
pos_from_vec(pos, ovec); |
| 504 |
rbf->ord = 0; |
| 505 |
rbf->next = NULL; |
| 506 |
rbf->ejl = NULL; |
| 507 |
VCOPY(rbf->invec, invec); |
| 508 |
rbf->nrbf = 1; |
| 509 |
rbf->rbfa[0].peak = bsdf_spec_val * COSF(ovec[2]); |
| 510 |
rbf->rbfa[0].chroma = c_dfchroma; |
| 511 |
rbf->rbfa[0].crad = ANG2R(bsdf_spec_rad); |
| 512 |
rbf->rbfa[0].gx = pos[0]; |
| 513 |
rbf->rbfa[0].gy = pos[1]; |
| 514 |
rbf->vtotal = rbf_volume(rbf->rbfa); |
| 515 |
return(rbf); |
| 516 |
} |
| 517 |
|
| 518 |
/* Advect and allocate new RBF along edge (internal call) */ |
| 519 |
RBFNODE * |
| 520 |
e_advect_rbf(const MIGRATION *mig, const FVECT invec, int lobe_lim) |
| 521 |
{ |
| 522 |
double cthresh = FTINY; |
| 523 |
RBFNODE *rbf; |
| 524 |
int n, i, j; |
| 525 |
double t, full_dist; |
| 526 |
/* get relative position */ |
| 527 |
t = Acos(DOT(invec, mig->rbfv[0]->invec)); |
| 528 |
if (t <= .001) { /* near first DSF */ |
| 529 |
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(mig->rbfv[0]->nrbf-1); |
| 530 |
rbf = (RBFNODE *)malloc(n); |
| 531 |
if (rbf == NULL) |
| 532 |
goto memerr; |
| 533 |
memcpy(rbf, mig->rbfv[0], n); /* just duplicate */ |
| 534 |
rbf->next = NULL; rbf->ejl = NULL; |
| 535 |
return(rbf); |
| 536 |
} |
| 537 |
full_dist = acos(DOT(mig->rbfv[0]->invec, mig->rbfv[1]->invec)); |
| 538 |
if (t >= full_dist-.001) { /* near second DSF */ |
| 539 |
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(mig->rbfv[1]->nrbf-1); |
| 540 |
rbf = (RBFNODE *)malloc(n); |
| 541 |
if (rbf == NULL) |
| 542 |
goto memerr; |
| 543 |
memcpy(rbf, mig->rbfv[1], n); /* just duplicate */ |
| 544 |
rbf->next = NULL; rbf->ejl = NULL; |
| 545 |
return(rbf); |
| 546 |
} |
| 547 |
t /= full_dist; |
| 548 |
tryagain: |
| 549 |
n = 0; /* count migrating particles */ |
| 550 |
for (i = 0; i < mtx_nrows(mig); i++) |
| 551 |
for (j = 0; j < mtx_ncols(mig); j++) |
| 552 |
n += (mtx_coef(mig,i,j) > cthresh); |
| 553 |
/* are we over our limit? */ |
| 554 |
if ((lobe_lim > 0) & (n > lobe_lim)) { |
| 555 |
cthresh = cthresh*2. + 10.*FTINY; |
| 556 |
goto tryagain; |
| 557 |
} |
| 558 |
#ifdef DEBUG |
| 559 |
fprintf(stderr, "Input RBFs have %d, %d nodes -> output has %d\n", |
| 560 |
mig->rbfv[0]->nrbf, mig->rbfv[1]->nrbf, n); |
| 561 |
#endif |
| 562 |
rbf = (RBFNODE *)malloc(sizeof(RBFNODE) + sizeof(RBFVAL)*(n-1)); |
| 563 |
if (rbf == NULL) |
| 564 |
goto memerr; |
| 565 |
rbf->next = NULL; rbf->ejl = NULL; |
| 566 |
VCOPY(rbf->invec, invec); |
| 567 |
rbf->nrbf = n; |
| 568 |
rbf->vtotal = 1.-t + t*mig->rbfv[1]->vtotal/mig->rbfv[0]->vtotal; |
| 569 |
n = 0; /* advect RBF lobes */ |
| 570 |
for (i = 0; i < mtx_nrows(mig); i++) { |
| 571 |
const RBFVAL *rbf0i = &mig->rbfv[0]->rbfa[i]; |
| 572 |
const float peak0 = rbf0i->peak; |
| 573 |
const double rad0 = R2ANG(rbf0i->crad); |
| 574 |
C_COLOR cc0; |
| 575 |
FVECT v0; |
| 576 |
float mv; |
| 577 |
ovec_from_pos(v0, rbf0i->gx, rbf0i->gy); |
| 578 |
c_decodeChroma(&cc0, rbf0i->chroma); |
| 579 |
for (j = 0; j < mtx_ncols(mig); j++) |
| 580 |
if ((mv = mtx_coef(mig,i,j)) > cthresh) { |
| 581 |
const RBFVAL *rbf1j = &mig->rbfv[1]->rbfa[j]; |
| 582 |
double rad2; |
| 583 |
FVECT v; |
| 584 |
int pos[2]; |
| 585 |
rad2 = R2ANG(rbf1j->crad); |
| 586 |
rad2 = rad0*rad0*(1.-t) + rad2*rad2*t; |
| 587 |
rbf->rbfa[n].peak = peak0 * mv * rbf->vtotal * |
| 588 |
rad0*rad0/rad2; |
| 589 |
if (rbf_colorimetry == RBCtristimulus) { |
| 590 |
C_COLOR cres; |
| 591 |
c_decodeChroma(&cres, rbf1j->chroma); |
| 592 |
c_cmix(&cres, 1.-t, &cc0, t, &cres); |
| 593 |
rbf->rbfa[n].chroma = c_encodeChroma(&cres); |
| 594 |
} else |
| 595 |
rbf->rbfa[n].chroma = c_dfchroma; |
| 596 |
rbf->rbfa[n].crad = ANG2R(sqrt(rad2)); |
| 597 |
ovec_from_pos(v, rbf1j->gx, rbf1j->gy); |
| 598 |
geodesic(v, v0, v, t, GEOD_REL); |
| 599 |
pos_from_vec(pos, v); |
| 600 |
rbf->rbfa[n].gx = pos[0]; |
| 601 |
rbf->rbfa[n].gy = pos[1]; |
| 602 |
++n; |
| 603 |
} |
| 604 |
} |
| 605 |
rbf->vtotal *= mig->rbfv[0]->vtotal; /* turn ratio into actual */ |
| 606 |
return(rbf); |
| 607 |
memerr: |
| 608 |
fprintf(stderr, "%s: Out of memory in e_advect_rbf()\n", progname); |
| 609 |
exit(1); |
| 610 |
return(NULL); /* pro forma return */ |
| 611 |
} |
| 612 |
|
| 613 |
/* Clear our BSDF representation and free memory */ |
| 614 |
void |
| 615 |
clear_bsdf_rep(void) |
| 616 |
{ |
| 617 |
while (mig_list != NULL) { |
| 618 |
MIGRATION *mig = mig_list; |
| 619 |
mig_list = mig->next; |
| 620 |
free(mig); |
| 621 |
} |
| 622 |
while (dsf_list != NULL) { |
| 623 |
RBFNODE *rbf = dsf_list; |
| 624 |
dsf_list = rbf->next; |
| 625 |
free(rbf); |
| 626 |
} |
| 627 |
bsdf_name[0] = '\0'; |
| 628 |
bsdf_manuf[0] = '\0'; |
| 629 |
inp_coverage = 0; |
| 630 |
single_plane_incident = -1; |
| 631 |
input_orient = output_orient = 0; |
| 632 |
rbf_colorimetry = RBCunknown; |
| 633 |
grid_res = GRIDRES; |
| 634 |
memset(bsdf_hist, 0, sizeof(bsdf_hist)); |
| 635 |
bsdf_min = 0; |
| 636 |
bsdf_spec_val = 0; |
| 637 |
bsdf_spec_rad = 0; |
| 638 |
} |
| 639 |
|
| 640 |
/* Write our BSDF mesh interpolant out to the given binary stream */ |
| 641 |
void |
| 642 |
save_bsdf_rep(FILE *ofp) |
| 643 |
{ |
| 644 |
RBFNODE *rbf; |
| 645 |
MIGRATION *mig; |
| 646 |
int i, n; |
| 647 |
/* finish header */ |
| 648 |
if (bsdf_name[0]) |
| 649 |
fprintf(ofp, "NAME=%s\n", bsdf_name); |
| 650 |
if (bsdf_manuf[0]) |
| 651 |
fprintf(ofp, "MANUFACT=%s\n", bsdf_manuf); |
| 652 |
fprintf(ofp, "SYMMETRY=%d\n", !single_plane_incident * inp_coverage); |
| 653 |
fprintf(ofp, "IO_SIDES= %d %d\n", input_orient, output_orient); |
| 654 |
fprintf(ofp, "COLORIMETRY=%s\n", RBCident[rbf_colorimetry]); |
| 655 |
fprintf(ofp, "GRIDRES=%d\n", grid_res); |
| 656 |
fprintf(ofp, "BSDFMIN=%g\n", bsdf_min); |
| 657 |
if ((bsdf_spec_val > bsdf_min) & (bsdf_spec_rad > 0)) |
| 658 |
fprintf(ofp, "BSDFSPEC= %f %f\n", bsdf_spec_val, bsdf_spec_rad); |
| 659 |
fputformat(BSDFREP_FMT, ofp); |
| 660 |
fputc('\n', ofp); |
| 661 |
putint(BSDFREP_MAGIC, 2, ofp); |
| 662 |
/* write each DSF */ |
| 663 |
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) { |
| 664 |
putint(rbf->ord, 4, ofp); |
| 665 |
putflt(rbf->invec[0], ofp); |
| 666 |
putflt(rbf->invec[1], ofp); |
| 667 |
putflt(rbf->invec[2], ofp); |
| 668 |
putflt(rbf->vtotal, ofp); |
| 669 |
putint(rbf->nrbf, 4, ofp); |
| 670 |
for (i = 0; i < rbf->nrbf; i++) { |
| 671 |
putflt(rbf->rbfa[i].peak, ofp); |
| 672 |
putint(rbf->rbfa[i].chroma, 2, ofp); |
| 673 |
putint(rbf->rbfa[i].crad, 2, ofp); |
| 674 |
putint(rbf->rbfa[i].gx, 2, ofp); |
| 675 |
putint(rbf->rbfa[i].gy, 2, ofp); |
| 676 |
} |
| 677 |
} |
| 678 |
putint(-1, 4, ofp); /* terminator */ |
| 679 |
/* write each migration matrix */ |
| 680 |
for (mig = mig_list; mig != NULL; mig = mig->next) { |
| 681 |
int zerocnt = 0; |
| 682 |
putint(mig->rbfv[0]->ord, 4, ofp); |
| 683 |
putint(mig->rbfv[1]->ord, 4, ofp); |
| 684 |
/* write out as sparse data */ |
| 685 |
n = mtx_nrows(mig) * mtx_ncols(mig); |
| 686 |
for (i = 0; i < n; i++) { |
| 687 |
if (zerocnt == 0xff) { |
| 688 |
putint(0xff, 1, ofp); zerocnt = 0; |
| 689 |
} |
| 690 |
if (mig->mtx[i] != 0) { |
| 691 |
putint(zerocnt, 1, ofp); zerocnt = 0; |
| 692 |
putflt(mig->mtx[i], ofp); |
| 693 |
} else |
| 694 |
++zerocnt; |
| 695 |
} |
| 696 |
putint(zerocnt, 1, ofp); |
| 697 |
} |
| 698 |
putint(-1, 4, ofp); /* terminator */ |
| 699 |
putint(-1, 4, ofp); |
| 700 |
if (fflush(ofp) == EOF) { |
| 701 |
fprintf(stderr, "%s: error writing BSDF interpolant\n", |
| 702 |
progname); |
| 703 |
exit(1); |
| 704 |
} |
| 705 |
} |
| 706 |
|
| 707 |
/* Check header line for critical information */ |
| 708 |
static int |
| 709 |
headline(char *s, void *p) |
| 710 |
{ |
| 711 |
char fmt[MAXFMTLEN]; |
| 712 |
int i; |
| 713 |
|
| 714 |
if (isheadid(s)) |
| 715 |
return(0); |
| 716 |
if (!strncmp(s, "NAME=", 5)) { |
| 717 |
strcpy(bsdf_name, s+5); |
| 718 |
bsdf_name[strlen(bsdf_name)-1] = '\0'; |
| 719 |
return(1); |
| 720 |
} |
| 721 |
if (!strncmp(s, "MANUFACT=", 9)) { |
| 722 |
strcpy(bsdf_manuf, s+9); |
| 723 |
bsdf_manuf[strlen(bsdf_manuf)-1] = '\0'; |
| 724 |
return(1); |
| 725 |
} |
| 726 |
if (!strncmp(s, "SYMMETRY=", 9)) { |
| 727 |
inp_coverage = atoi(s+9); |
| 728 |
single_plane_incident = !inp_coverage; |
| 729 |
return(1); |
| 730 |
} |
| 731 |
if (!strncmp(s, "IO_SIDES=", 9)) { |
| 732 |
sscanf(s+9, "%d %d", &input_orient, &output_orient); |
| 733 |
return(1); |
| 734 |
} |
| 735 |
if (!strncmp(s, "COLORIMETRY=", 12)) { |
| 736 |
fmt[0] = '\0'; |
| 737 |
sscanf(s+12, "%s", fmt); |
| 738 |
for (i = RBCunknown; i >= 0; i--) |
| 739 |
if (!strcmp(fmt, RBCident[i])) |
| 740 |
break; |
| 741 |
if (i < 0) |
| 742 |
return(-1); |
| 743 |
rbf_colorimetry = i; |
| 744 |
return(1); |
| 745 |
} |
| 746 |
if (!strncmp(s, "GRIDRES=", 8)) { |
| 747 |
sscanf(s+8, "%d", &grid_res); |
| 748 |
return(1); |
| 749 |
} |
| 750 |
if (!strncmp(s, "BSDFMIN=", 8)) { |
| 751 |
sscanf(s+8, "%lf", &bsdf_min); |
| 752 |
return(1); |
| 753 |
} |
| 754 |
if (!strncmp(s, "BSDFSPEC=", 9)) { |
| 755 |
sscanf(s+9, "%lf %lf", &bsdf_spec_val, &bsdf_spec_rad); |
| 756 |
return(1); |
| 757 |
} |
| 758 |
if (formatval(fmt, s)) |
| 759 |
return (strcmp(fmt, BSDFREP_FMT) ? -1 : 0); |
| 760 |
if (sir_headshare != NULL) |
| 761 |
return ((*sir_headshare)(s)); |
| 762 |
return(0); |
| 763 |
} |
| 764 |
|
| 765 |
/* Read a BSDF mesh interpolant from the given binary stream */ |
| 766 |
int |
| 767 |
load_bsdf_rep(FILE *ifp) |
| 768 |
{ |
| 769 |
RBFNODE rbfh; |
| 770 |
int from_ord, to_ord; |
| 771 |
int i; |
| 772 |
|
| 773 |
clear_bsdf_rep(); |
| 774 |
if (ifp == NULL) |
| 775 |
return(0); |
| 776 |
if (getheader(ifp, headline, NULL) < 0 || (single_plane_incident < 0) | |
| 777 |
!input_orient | !output_orient | |
| 778 |
(grid_res < 16) | (grid_res > 0xffff)) { |
| 779 |
fprintf(stderr, "%s: missing/bad format for BSDF interpolant\n", |
| 780 |
progname); |
| 781 |
return(0); |
| 782 |
} |
| 783 |
if (getint(2, ifp) != BSDFREP_MAGIC) { |
| 784 |
fprintf(stderr, "%s: bad magic number for BSDF interpolant\n", |
| 785 |
progname); |
| 786 |
return(0); |
| 787 |
} |
| 788 |
memset(&rbfh, 0, sizeof(rbfh)); /* read each DSF */ |
| 789 |
while ((rbfh.ord = getint(4, ifp)) >= 0) { |
| 790 |
RBFNODE *newrbf; |
| 791 |
|
| 792 |
rbfh.invec[0] = getflt(ifp); |
| 793 |
rbfh.invec[1] = getflt(ifp); |
| 794 |
rbfh.invec[2] = getflt(ifp); |
| 795 |
if (normalize(rbfh.invec) == 0) { |
| 796 |
fprintf(stderr, "%s: zero incident vector\n", progname); |
| 797 |
return(0); |
| 798 |
} |
| 799 |
rbfh.vtotal = getflt(ifp); |
| 800 |
rbfh.nrbf = getint(4, ifp); |
| 801 |
newrbf = (RBFNODE *)malloc(sizeof(RBFNODE) + |
| 802 |
sizeof(RBFVAL)*(rbfh.nrbf-1)); |
| 803 |
if (newrbf == NULL) |
| 804 |
goto memerr; |
| 805 |
*newrbf = rbfh; |
| 806 |
for (i = 0; i < rbfh.nrbf; i++) { |
| 807 |
newrbf->rbfa[i].peak = getflt(ifp); |
| 808 |
newrbf->rbfa[i].chroma = getint(2, ifp) & 0xffff; |
| 809 |
newrbf->rbfa[i].crad = getint(2, ifp) & 0xffff; |
| 810 |
newrbf->rbfa[i].gx = getint(2, ifp) & 0xffff; |
| 811 |
newrbf->rbfa[i].gy = getint(2, ifp) & 0xffff; |
| 812 |
} |
| 813 |
if (feof(ifp)) |
| 814 |
goto badEOF; |
| 815 |
/* insert in global list */ |
| 816 |
if (insert_dsf(newrbf) != rbfh.ord) { |
| 817 |
fprintf(stderr, "%s: error adding DSF\n", progname); |
| 818 |
return(0); |
| 819 |
} |
| 820 |
} |
| 821 |
/* read each migration matrix */ |
| 822 |
while ((from_ord = getint(4, ifp)) >= 0 && |
| 823 |
(to_ord = getint(4, ifp)) >= 0) { |
| 824 |
RBFNODE *from_rbf = get_dsf(from_ord); |
| 825 |
RBFNODE *to_rbf = get_dsf(to_ord); |
| 826 |
MIGRATION *newmig; |
| 827 |
int n; |
| 828 |
|
| 829 |
if ((from_rbf == NULL) | (to_rbf == NULL)) { |
| 830 |
fprintf(stderr, |
| 831 |
"%s: bad DSF reference in migration edge\n", |
| 832 |
progname); |
| 833 |
return(0); |
| 834 |
} |
| 835 |
n = from_rbf->nrbf * to_rbf->nrbf; |
| 836 |
newmig = (MIGRATION *)malloc(sizeof(MIGRATION) + |
| 837 |
sizeof(float)*(n-1)); |
| 838 |
if (newmig == NULL) |
| 839 |
goto memerr; |
| 840 |
newmig->rbfv[0] = from_rbf; |
| 841 |
newmig->rbfv[1] = to_rbf; |
| 842 |
memset(newmig->mtx, 0, sizeof(float)*n); |
| 843 |
for (i = 0; ; ) { /* read sparse data */ |
| 844 |
int zc = getint(1, ifp) & 0xff; |
| 845 |
if ((i += zc) >= n) |
| 846 |
break; |
| 847 |
if (zc == 0xff) |
| 848 |
continue; |
| 849 |
newmig->mtx[i++] = getflt(ifp); |
| 850 |
} |
| 851 |
if (feof(ifp)) |
| 852 |
goto badEOF; |
| 853 |
/* insert in edge lists */ |
| 854 |
newmig->enxt[0] = from_rbf->ejl; |
| 855 |
from_rbf->ejl = newmig; |
| 856 |
newmig->enxt[1] = to_rbf->ejl; |
| 857 |
to_rbf->ejl = newmig; |
| 858 |
/* push onto global list */ |
| 859 |
newmig->next = mig_list; |
| 860 |
mig_list = newmig; |
| 861 |
} |
| 862 |
return(1); /* success! */ |
| 863 |
memerr: |
| 864 |
fprintf(stderr, "%s: Out of memory in load_bsdf_rep()\n", progname); |
| 865 |
exit(1); |
| 866 |
badEOF: |
| 867 |
fprintf(stderr, "%s: Unexpected EOF in load_bsdf_rep()\n", progname); |
| 868 |
return(0); |
| 869 |
} |
