| 11 |
|
* |
| 12 |
|
*/ |
| 13 |
|
|
| 14 |
+ |
#define _USE_MATH_DEFINES |
| 15 |
|
#include "rtio.h" |
| 15 |
– |
#include <stdlib.h> |
| 16 |
|
#include <math.h> |
| 17 |
|
#include <ctype.h> |
| 18 |
|
#include "ezxml.h" |
| 28 |
|
#define RC_INTERR (-4) |
| 29 |
|
#define RC_MEMERR (-5) |
| 30 |
|
|
| 31 |
< |
#define MAXLATS 46 /* maximum number of latitudes */ |
| 32 |
< |
|
| 33 |
< |
/* BSDF angle specification */ |
| 34 |
< |
typedef struct { |
| 35 |
< |
char name[64]; /* basis name */ |
| 36 |
< |
int nangles; /* total number of directions */ |
| 37 |
< |
struct { |
| 38 |
< |
float tmin; /* starting theta */ |
| 39 |
< |
int nphis; /* number of phis (0 term) */ |
| 40 |
< |
} lat[MAXLATS+1]; /* latitudes */ |
| 41 |
< |
} ANGLE_BASIS; |
| 42 |
< |
|
| 43 |
< |
#define MAXABASES 7 /* limit on defined bases */ |
| 44 |
< |
|
| 45 |
< |
static ANGLE_BASIS abase_list[MAXABASES] = { |
| 31 |
> |
ANGLE_BASIS abase_list[MAXABASES] = { |
| 32 |
|
{ |
| 33 |
|
"LBNL/Klems Full", 145, |
| 34 |
< |
{ {-5., 1}, |
| 34 |
> |
{ {0., 1}, |
| 35 |
|
{5., 8}, |
| 36 |
|
{15., 16}, |
| 37 |
|
{25., 20}, |
| 43 |
|
{90., 0} } |
| 44 |
|
}, { |
| 45 |
|
"LBNL/Klems Half", 73, |
| 46 |
< |
{ {-6.5, 1}, |
| 46 |
> |
{ {0., 1}, |
| 47 |
|
{6.5, 8}, |
| 48 |
|
{19.5, 12}, |
| 49 |
|
{32.5, 16}, |
| 53 |
|
{90., 0} } |
| 54 |
|
}, { |
| 55 |
|
"LBNL/Klems Quarter", 41, |
| 56 |
< |
{ {-9., 1}, |
| 56 |
> |
{ {0., 1}, |
| 57 |
|
{9., 8}, |
| 58 |
|
{27., 12}, |
| 59 |
|
{46., 12}, |
| 62 |
|
} |
| 63 |
|
}; |
| 64 |
|
|
| 65 |
< |
static int nabases = 3; /* current number of defined bases */ |
| 65 |
> |
int nabases = 3; /* current number of defined bases */ |
| 66 |
|
|
| 67 |
+ |
C_COLOR mtx_RGB_prim[3]; /* our RGB primaries */ |
| 68 |
+ |
float mtx_RGB_coef[3]; /* corresponding Y coefficients */ |
| 69 |
+ |
|
| 70 |
+ |
enum {mtx_Y, mtx_X, mtx_Z}; /* matrix components (mtx_Y==0) */ |
| 71 |
+ |
|
| 72 |
+ |
/* check if two real values are near enough to equal */ |
| 73 |
|
static int |
| 74 |
|
fequal(double a, double b) |
| 75 |
|
{ |
| 78 |
|
return (a <= 1e-6) & (a >= -1e-6); |
| 79 |
|
} |
| 80 |
|
|
| 81 |
< |
/* Returns the name of the given tag */ |
| 90 |
< |
#ifdef ezxml_name |
| 91 |
< |
#undef ezxml_name |
| 92 |
< |
static char * |
| 93 |
< |
ezxml_name(ezxml_t xml) |
| 94 |
< |
{ |
| 95 |
< |
if (xml == NULL) |
| 96 |
< |
return NULL; |
| 97 |
< |
return xml->name; |
| 98 |
< |
} |
| 99 |
< |
#endif |
| 100 |
< |
|
| 101 |
< |
/* Returns the given tag's character content or empty string if none */ |
| 102 |
< |
#ifdef ezxml_txt |
| 103 |
< |
#undef ezxml_txt |
| 104 |
< |
static char * |
| 105 |
< |
ezxml_txt(ezxml_t xml) |
| 106 |
< |
{ |
| 107 |
< |
if (xml == NULL) |
| 108 |
< |
return ""; |
| 109 |
< |
return xml->txt; |
| 110 |
< |
} |
| 111 |
< |
#endif |
| 112 |
< |
|
| 113 |
< |
/* Convert error to standard BSDF code */ |
| 81 |
> |
/* convert error to standard BSDF code */ |
| 82 |
|
static SDError |
| 83 |
|
convert_errcode(int ec) |
| 84 |
|
{ |
| 99 |
|
return SDEunknown; |
| 100 |
|
} |
| 101 |
|
|
| 102 |
< |
/* Allocate a BSDF matrix of the given size */ |
| 102 |
> |
/* allocate a BSDF matrix of the given size */ |
| 103 |
|
static SDMat * |
| 104 |
|
SDnewMatrix(int ni, int no) |
| 105 |
|
{ |
| 123 |
|
} |
| 124 |
|
|
| 125 |
|
/* Free a BSDF matrix */ |
| 126 |
< |
#define SDfreeMatrix free |
| 126 |
> |
void |
| 127 |
> |
SDfreeMatrix(void *ptr) |
| 128 |
> |
{ |
| 129 |
> |
SDMat *mp = (SDMat *)ptr; |
| 130 |
|
|
| 131 |
< |
/* get vector for this angle basis index (front exiting) */ |
| 132 |
< |
static int |
| 131 |
> |
if (mp->chroma != NULL) free(mp->chroma); |
| 132 |
> |
free(ptr); |
| 133 |
> |
} |
| 134 |
> |
|
| 135 |
> |
/* compute square of real value */ |
| 136 |
> |
static double sq(double x) { return x*x; } |
| 137 |
> |
|
| 138 |
> |
/* Get vector for this angle basis index (front exiting) */ |
| 139 |
> |
int |
| 140 |
|
fo_getvec(FVECT v, double ndxr, void *p) |
| 141 |
|
{ |
| 142 |
|
ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
| 144 |
|
double randX = ndxr - ndx; |
| 145 |
|
double rx[2]; |
| 146 |
|
int li; |
| 147 |
< |
double pol, azi, d; |
| 147 |
> |
double azi, d; |
| 148 |
|
|
| 149 |
|
if ((ndxr < 0) | (ndx >= ab->nangles)) |
| 150 |
|
return RC_FAIL; |
| 151 |
|
for (li = 0; ndx >= ab->lat[li].nphis; li++) |
| 152 |
|
ndx -= ab->lat[li].nphis; |
| 153 |
|
SDmultiSamp(rx, 2, randX); |
| 154 |
< |
pol = M_PI/180.*( (1.-rx[0])*ab->lat[li].tmin + |
| 155 |
< |
rx[0]*ab->lat[li+1].tmin ); |
| 154 |
> |
d = (1. - rx[0])*sq(cos(M_PI/180.*ab->lat[li].tmin)) + |
| 155 |
> |
rx[0]*sq(cos(M_PI/180.*ab->lat[li+1].tmin)); |
| 156 |
> |
v[2] = d = sqrt(d); /* cos(pol) */ |
| 157 |
|
azi = 2.*M_PI*(ndx + rx[1] - .5)/ab->lat[li].nphis; |
| 179 |
– |
v[2] = d = cos(pol); |
| 158 |
|
d = sqrt(1. - d*d); /* sin(pol) */ |
| 159 |
|
v[0] = cos(azi)*d; |
| 160 |
|
v[1] = sin(azi)*d; |
| 161 |
|
return RC_GOOD; |
| 162 |
|
} |
| 163 |
|
|
| 164 |
< |
/* get index corresponding to the given vector (front exiting) */ |
| 165 |
< |
static int |
| 164 |
> |
/* Get index corresponding to the given vector (front exiting) */ |
| 165 |
> |
int |
| 166 |
|
fo_getndx(const FVECT v, void *p) |
| 167 |
|
{ |
| 168 |
|
ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
| 169 |
|
int li, ndx; |
| 170 |
< |
double pol, azi, d; |
| 170 |
> |
double pol, azi; |
| 171 |
|
|
| 172 |
|
if (v == NULL) |
| 173 |
|
return -1; |
| 174 |
|
if ((v[2] < 0) | (v[2] > 1.)) |
| 175 |
|
return -1; |
| 176 |
< |
pol = 180.0/M_PI*acos(v[2]); |
| 176 |
> |
pol = 180.0/M_PI*Acos(v[2]); |
| 177 |
|
azi = 180.0/M_PI*atan2(v[1], v[0]); |
| 178 |
|
if (azi < 0.0) azi += 360.0; |
| 179 |
|
for (li = 1; ab->lat[li].tmin <= pol; li++) |
| 187 |
|
return ndx; |
| 188 |
|
} |
| 189 |
|
|
| 190 |
< |
/* compute square of real value */ |
| 191 |
< |
static double sq(double x) { return x*x; } |
| 214 |
< |
|
| 215 |
< |
/* get projected solid angle for this angle basis index (universal) */ |
| 216 |
< |
static double |
| 190 |
> |
/* Get projected solid angle for this angle basis index (universal) */ |
| 191 |
> |
double |
| 192 |
|
io_getohm(int ndx, void *p) |
| 193 |
|
{ |
| 194 |
+ |
static void *last_p = NULL; |
| 195 |
|
static int last_li = -1; |
| 196 |
|
static double last_ohm; |
| 197 |
|
ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
| 202 |
|
return -1.; |
| 203 |
|
for (li = 0; ndx >= ab->lat[li].nphis; li++) |
| 204 |
|
ndx -= ab->lat[li].nphis; |
| 205 |
< |
if (li == last_li) /* cached latitude? */ |
| 205 |
> |
if ((p == last_p) & (li == last_li)) /* cached latitude? */ |
| 206 |
|
return last_ohm; |
| 207 |
+ |
last_p = p; |
| 208 |
|
last_li = li; |
| 232 |
– |
theta1 = M_PI/180. * ab->lat[li+1].tmin; |
| 233 |
– |
if (ab->lat[li].nphis == 1) /* special case */ |
| 234 |
– |
return last_ohm = M_PI*(1. - sq(cos(theta1))); |
| 209 |
|
theta = M_PI/180. * ab->lat[li].tmin; |
| 210 |
+ |
theta1 = M_PI/180. * ab->lat[li+1].tmin; |
| 211 |
|
return last_ohm = M_PI*(sq(cos(theta)) - sq(cos(theta1))) / |
| 212 |
|
(double)ab->lat[li].nphis; |
| 213 |
|
} |
| 214 |
|
|
| 215 |
< |
/* get vector for this angle basis index (back incident) */ |
| 216 |
< |
static int |
| 215 |
> |
/* Get vector for this angle basis index (back incident) */ |
| 216 |
> |
int |
| 217 |
|
bi_getvec(FVECT v, double ndxr, void *p) |
| 218 |
|
{ |
| 219 |
|
if (!fo_getvec(v, ndxr, p)) |
| 226 |
|
return RC_GOOD; |
| 227 |
|
} |
| 228 |
|
|
| 229 |
< |
/* get index corresponding to the vector (back incident) */ |
| 230 |
< |
static int |
| 229 |
> |
/* Get index corresponding to the vector (back incident) */ |
| 230 |
> |
int |
| 231 |
|
bi_getndx(const FVECT v, void *p) |
| 232 |
|
{ |
| 233 |
|
FVECT v2; |
| 239 |
|
return fo_getndx(v2, p); |
| 240 |
|
} |
| 241 |
|
|
| 242 |
< |
/* get vector for this angle basis index (back exiting) */ |
| 243 |
< |
static int |
| 242 |
> |
/* Get vector for this angle basis index (back exiting) */ |
| 243 |
> |
int |
| 244 |
|
bo_getvec(FVECT v, double ndxr, void *p) |
| 245 |
|
{ |
| 246 |
|
if (!fo_getvec(v, ndxr, p)) |
| 251 |
|
return RC_GOOD; |
| 252 |
|
} |
| 253 |
|
|
| 254 |
< |
/* get index corresponding to the vector (back exiting) */ |
| 255 |
< |
static int |
| 254 |
> |
/* Get index corresponding to the vector (back exiting) */ |
| 255 |
> |
int |
| 256 |
|
bo_getndx(const FVECT v, void *p) |
| 257 |
|
{ |
| 258 |
|
FVECT v2; |
| 264 |
|
return fo_getndx(v2, p); |
| 265 |
|
} |
| 266 |
|
|
| 267 |
< |
/* get vector for this angle basis index (front incident) */ |
| 268 |
< |
static int |
| 267 |
> |
/* Get vector for this angle basis index (front incident) */ |
| 268 |
> |
int |
| 269 |
|
fi_getvec(FVECT v, double ndxr, void *p) |
| 270 |
|
{ |
| 271 |
|
if (!fo_getvec(v, ndxr, p)) |
| 277 |
|
return RC_GOOD; |
| 278 |
|
} |
| 279 |
|
|
| 280 |
< |
/* get index corresponding to the vector (front incident) */ |
| 281 |
< |
static int |
| 280 |
> |
/* Get index corresponding to the vector (front incident) */ |
| 281 |
> |
int |
| 282 |
|
fi_getndx(const FVECT v, void *p) |
| 283 |
|
{ |
| 284 |
|
FVECT v2; |
| 290 |
|
return fo_getndx(v2, p); |
| 291 |
|
} |
| 292 |
|
|
| 293 |
+ |
/* Get color or grayscale value for BSDF for the given direction pair */ |
| 294 |
+ |
int |
| 295 |
+ |
mBSDF_color(float coef[], const SDMat *dp, int i, int o) |
| 296 |
+ |
{ |
| 297 |
+ |
C_COLOR cxy; |
| 298 |
+ |
|
| 299 |
+ |
coef[0] = mBSDF_value(dp, i, o); |
| 300 |
+ |
if (dp->chroma == NULL) |
| 301 |
+ |
return 1; /* grayscale */ |
| 302 |
+ |
|
| 303 |
+ |
c_decodeChroma(&cxy, mBSDF_chroma(dp,i,o)); |
| 304 |
+ |
c_toSharpRGB(&cxy, coef[0], coef); |
| 305 |
+ |
coef[0] *= mtx_RGB_coef[0]; |
| 306 |
+ |
coef[1] *= mtx_RGB_coef[1]; |
| 307 |
+ |
coef[2] *= mtx_RGB_coef[2]; |
| 308 |
+ |
return 3; /* RGB color */ |
| 309 |
+ |
} |
| 310 |
+ |
|
| 311 |
|
/* load custom BSDF angle basis */ |
| 312 |
|
static int |
| 313 |
|
load_angle_basis(ezxml_t wab) |
| 339 |
|
ezxml_child(ezxml_child(wbb, |
| 340 |
|
"ThetaBounds"), "UpperTheta"))); |
| 341 |
|
if (!i) |
| 342 |
< |
abase_list[nabases].lat[i].tmin = |
| 350 |
< |
-abase_list[nabases].lat[i+1].tmin; |
| 342 |
> |
abase_list[nabases].lat[0].tmin = 0; |
| 343 |
|
else if (!fequal(atof(ezxml_txt(ezxml_child(ezxml_child(wbb, |
| 344 |
|
"ThetaBounds"), "LowerTheta"))), |
| 345 |
|
abase_list[nabases].lat[i].tmin)) { |
| 346 |
|
sprintf(SDerrorDetail, "Theta values disagree in '%s'", |
| 347 |
< |
abname); |
| 347 |
> |
abname); |
| 348 |
|
return RC_DATERR; |
| 349 |
|
} |
| 350 |
|
abase_list[nabases].nangles += |
| 354 |
|
(abase_list[nabases].lat[i].nphis == 1 && |
| 355 |
|
abase_list[nabases].lat[i].tmin > FTINY)) { |
| 356 |
|
sprintf(SDerrorDetail, "Illegal phi count in '%s'", |
| 357 |
< |
abname); |
| 357 |
> |
abname); |
| 358 |
|
return RC_DATERR; |
| 359 |
|
} |
| 360 |
|
} |
| 400 |
|
|
| 401 |
|
/* load BSDF distribution for this wavelength */ |
| 402 |
|
static int |
| 403 |
< |
load_bsdf_data(SDData *sd, ezxml_t wdb, int rowinc) |
| 403 |
> |
load_bsdf_data(SDData *sd, ezxml_t wdb, int ct, int rowinc) |
| 404 |
|
{ |
| 405 |
|
SDSpectralDF *df; |
| 406 |
|
SDMat *dp; |
| 407 |
|
char *sdata; |
| 416 |
– |
int tfront; |
| 408 |
|
int inbi, outbi; |
| 409 |
|
int i; |
| 410 |
|
/* allocate BSDF component */ |
| 411 |
|
sdata = ezxml_txt(ezxml_child(wdb, "WavelengthDataDirection")); |
| 412 |
+ |
if (!sdata) |
| 413 |
+ |
return RC_FAIL; |
| 414 |
|
/* |
| 415 |
|
* Remember that front and back are reversed from WINDOW 6 orientations |
| 423 |
– |
* Favor their "Front" (incoming light) since that's more often valid |
| 416 |
|
*/ |
| 417 |
< |
tfront = !strcasecmp(sdata, "Transmission Back"); |
| 418 |
< |
if (!strcasecmp(sdata, "Transmission Front") || |
| 427 |
< |
tfront & (sd->tf == NULL)) { |
| 428 |
< |
if (sd->tf != NULL) |
| 429 |
< |
SDfreeSpectralDF(sd->tf); |
| 430 |
< |
if ((sd->tf = SDnewSpectralDF(1)) == NULL) |
| 417 |
> |
if (!strcasecmp(sdata, "Transmission Front")) { |
| 418 |
> |
if (sd->tb == NULL && (sd->tb = SDnewSpectralDF(3)) == NULL) |
| 419 |
|
return RC_MEMERR; |
| 420 |
+ |
df = sd->tb; |
| 421 |
+ |
} else if (!strcasecmp(sdata, "Transmission Back")) { |
| 422 |
+ |
if (sd->tf == NULL && (sd->tf = SDnewSpectralDF(3)) == NULL) |
| 423 |
+ |
return RC_MEMERR; |
| 424 |
|
df = sd->tf; |
| 425 |
|
} else if (!strcasecmp(sdata, "Reflection Front")) { |
| 426 |
< |
if (sd->rb != NULL) /* note back-front reversal */ |
| 435 |
< |
SDfreeSpectralDF(sd->rb); |
| 436 |
< |
if ((sd->rb = SDnewSpectralDF(1)) == NULL) |
| 426 |
> |
if (sd->rb == NULL && (sd->rb = SDnewSpectralDF(3)) == NULL) |
| 427 |
|
return RC_MEMERR; |
| 428 |
|
df = sd->rb; |
| 429 |
|
} else if (!strcasecmp(sdata, "Reflection Back")) { |
| 430 |
< |
if (sd->rf != NULL) /* note front-back reversal */ |
| 441 |
< |
SDfreeSpectralDF(sd->rf); |
| 442 |
< |
if ((sd->rf = SDnewSpectralDF(1)) == NULL) |
| 430 |
> |
if (sd->rf == NULL && (sd->rf = SDnewSpectralDF(3)) == NULL) |
| 431 |
|
return RC_MEMERR; |
| 432 |
|
df = sd->rf; |
| 433 |
|
} else |
| 434 |
|
return RC_FAIL; |
| 435 |
< |
/* XXX should also check "ScatteringDataType" for consistency? */ |
| 435 |
> |
/* free previous matrix if any */ |
| 436 |
> |
if (df->comp[ct].dist != NULL) { |
| 437 |
> |
SDfreeMatrix(df->comp[ct].dist); |
| 438 |
> |
df->comp[ct].dist = NULL; |
| 439 |
> |
} |
| 440 |
|
/* get angle bases */ |
| 441 |
|
sdata = ezxml_txt(ezxml_child(wdb,"ColumnAngleBasis")); |
| 442 |
|
if (!sdata || !*sdata) { |
| 471 |
|
dp->ib_priv = &abase_list[inbi]; |
| 472 |
|
dp->ob_priv = &abase_list[outbi]; |
| 473 |
|
if (df == sd->tf) { |
| 474 |
< |
if (tfront) { |
| 475 |
< |
dp->ib_vec = &fi_getvec; |
| 476 |
< |
dp->ib_ndx = &fi_getndx; |
| 477 |
< |
dp->ob_vec = &bo_getvec; |
| 478 |
< |
dp->ob_ndx = &bo_getndx; |
| 479 |
< |
} else { |
| 480 |
< |
dp->ib_vec = &bi_getvec; |
| 481 |
< |
dp->ib_ndx = &bi_getndx; |
| 482 |
< |
dp->ob_vec = &fo_getvec; |
| 491 |
< |
dp->ob_ndx = &fo_getndx; |
| 492 |
< |
} |
| 474 |
> |
dp->ib_vec = &fi_getvec; |
| 475 |
> |
dp->ib_ndx = &fi_getndx; |
| 476 |
> |
dp->ob_vec = &bo_getvec; |
| 477 |
> |
dp->ob_ndx = &bo_getndx; |
| 478 |
> |
} else if (df == sd->tb) { |
| 479 |
> |
dp->ib_vec = &bi_getvec; |
| 480 |
> |
dp->ib_ndx = &bi_getndx; |
| 481 |
> |
dp->ob_vec = &fo_getvec; |
| 482 |
> |
dp->ob_ndx = &fo_getndx; |
| 483 |
|
} else if (df == sd->rf) { |
| 484 |
|
dp->ib_vec = &fi_getvec; |
| 485 |
|
dp->ib_ndx = &fi_getndx; |
| 493 |
|
} |
| 494 |
|
dp->ib_ohm = &io_getohm; |
| 495 |
|
dp->ob_ohm = &io_getohm; |
| 496 |
< |
df->comp[0].cspec[0] = c_dfcolor; /* XXX monochrome for now */ |
| 497 |
< |
df->comp[0].dist = dp; |
| 508 |
< |
df->comp[0].func = &SDhandleMtx; |
| 496 |
> |
df->comp[ct].dist = dp; |
| 497 |
> |
df->comp[ct].func = &SDhandleMtx; |
| 498 |
|
/* read BSDF data */ |
| 499 |
< |
sdata = ezxml_txt(ezxml_child(wdb,"ScatteringData")); |
| 499 |
> |
sdata = ezxml_txt(ezxml_child(wdb, "ScatteringData")); |
| 500 |
|
if (!sdata || !*sdata) { |
| 501 |
|
sprintf(SDerrorDetail, "Missing BSDF ScatteringData in '%s'", |
| 502 |
|
sd->name); |
| 503 |
|
return RC_FORMERR; |
| 504 |
|
} |
| 505 |
|
for (i = 0; i < dp->ninc*dp->nout; i++) { |
| 506 |
< |
char *sdnext = fskip(sdata); |
| 506 |
> |
char *sdnext = fskip(sdata); |
| 507 |
> |
double val; |
| 508 |
|
if (sdnext == NULL) { |
| 509 |
|
sprintf(SDerrorDetail, |
| 510 |
|
"Bad/missing BSDF ScatteringData in '%s'", |
| 511 |
|
sd->name); |
| 512 |
|
return RC_FORMERR; |
| 513 |
|
} |
| 514 |
< |
while (*sdnext && isspace(*sdnext)) |
| 514 |
> |
while (isspace(*sdnext)) |
| 515 |
|
sdnext++; |
| 516 |
|
if (*sdnext == ',') sdnext++; |
| 517 |
+ |
if ((val = atof(sdata)) < 0) |
| 518 |
+ |
val = 0; /* don't allow negative values */ |
| 519 |
|
if (rowinc) { |
| 520 |
|
int r = i/dp->nout; |
| 521 |
< |
int c = i - c*dp->nout; |
| 522 |
< |
mBSDF_value(dp,r,c) = atof(sdata); |
| 521 |
> |
int c = i - r*dp->nout; |
| 522 |
> |
mBSDF_value(dp,r,c) = val; |
| 523 |
|
} else |
| 524 |
< |
dp->bsdf[i] = atof(sdata); |
| 524 |
> |
dp->bsdf[i] = val; |
| 525 |
|
sdata = sdnext; |
| 526 |
|
} |
| 527 |
< |
return get_extrema(df); |
| 527 |
> |
return (ct == mtx_Y) ? get_extrema(df) : RC_GOOD; |
| 528 |
|
} |
| 529 |
|
|
| 530 |
< |
/* Subtract minimum (diffuse) scattering amount from BSDF */ |
| 530 |
> |
/* copy our RGB (x,y) primary chromaticities */ |
| 531 |
> |
static void |
| 532 |
> |
copy_RGB_prims(C_COLOR cspec[]) |
| 533 |
> |
{ |
| 534 |
> |
if (mtx_RGB_coef[1] < .001) { /* need to initialize */ |
| 535 |
> |
int i = 3; |
| 536 |
> |
while (i--) { |
| 537 |
> |
float rgb[3]; |
| 538 |
> |
rgb[0] = rgb[1] = rgb[2] = .0f; |
| 539 |
> |
rgb[i] = 1.f; |
| 540 |
> |
mtx_RGB_coef[i] = c_fromSharpRGB(rgb, &mtx_RGB_prim[i]); |
| 541 |
> |
} |
| 542 |
> |
} |
| 543 |
> |
memcpy(cspec, mtx_RGB_prim, sizeof(mtx_RGB_prim)); |
| 544 |
> |
} |
| 545 |
> |
|
| 546 |
> |
/* encode chromaticity if XYZ -- reduce to one channel in any case */ |
| 547 |
> |
static SDSpectralDF * |
| 548 |
> |
encode_chroma(SDSpectralDF *df) |
| 549 |
> |
{ |
| 550 |
> |
SDMat *mpx, *mpy, *mpz; |
| 551 |
> |
int n; |
| 552 |
> |
|
| 553 |
> |
if (df == NULL || df->ncomp != 3) |
| 554 |
> |
return df; |
| 555 |
> |
|
| 556 |
> |
mpy = (SDMat *)df->comp[mtx_Y].dist; |
| 557 |
> |
if (mpy == NULL) { |
| 558 |
> |
free(df); |
| 559 |
> |
return NULL; |
| 560 |
> |
} |
| 561 |
> |
mpx = (SDMat *)df->comp[mtx_X].dist; |
| 562 |
> |
mpz = (SDMat *)df->comp[mtx_Z].dist; |
| 563 |
> |
if (mpx == NULL || (mpx->ninc != mpy->ninc) | (mpx->nout != mpy->nout)) |
| 564 |
> |
goto done; |
| 565 |
> |
if (mpz == NULL || (mpz->ninc != mpy->ninc) | (mpz->nout != mpy->nout)) |
| 566 |
> |
goto done; |
| 567 |
> |
mpy->chroma = (C_CHROMA *)malloc(sizeof(C_CHROMA)*mpy->ninc*mpy->nout); |
| 568 |
> |
if (mpy->chroma == NULL) |
| 569 |
> |
goto done; /* XXX punt */ |
| 570 |
> |
/* encode chroma values */ |
| 571 |
> |
for (n = mpy->ninc*mpy->nout; n--; ) { |
| 572 |
> |
const double sum = mpx->bsdf[n] + mpy->bsdf[n] + mpz->bsdf[n]; |
| 573 |
> |
C_COLOR cxy; |
| 574 |
> |
if (sum > .0) |
| 575 |
> |
c_cset(&cxy, mpx->bsdf[n]/sum, mpy->bsdf[n]/sum); |
| 576 |
> |
else |
| 577 |
> |
c_cset(&cxy, 1./3., 1./3.); |
| 578 |
> |
mpy->chroma[n] = c_encodeChroma(&cxy); |
| 579 |
> |
} |
| 580 |
> |
done: /* free X & Z channels */ |
| 581 |
> |
if (mpx != NULL) SDfreeMatrix(mpx); |
| 582 |
> |
if (mpz != NULL) SDfreeMatrix(mpz); |
| 583 |
> |
if (mpy->chroma == NULL) /* grayscale after all? */ |
| 584 |
> |
df->comp[0].cspec[0] = c_dfcolor; |
| 585 |
> |
else /* else copy RGB primaries */ |
| 586 |
> |
copy_RGB_prims(df->comp[0].cspec); |
| 587 |
> |
df->ncomp = 1; /* return resized struct */ |
| 588 |
> |
return (SDSpectralDF *)realloc(df, sizeof(SDSpectralDF)); |
| 589 |
> |
} |
| 590 |
> |
|
| 591 |
> |
/* subtract minimum (diffuse) scattering amount from BSDF */ |
| 592 |
|
static double |
| 593 |
< |
subtract_min(SDMat *sm) |
| 593 |
> |
subtract_min(C_COLOR *cs, SDMat *sm) |
| 594 |
|
{ |
| 595 |
< |
float minv = sm->bsdf[0]; |
| 596 |
< |
int n = sm->ninc*sm->nout; |
| 597 |
< |
int i; |
| 595 |
> |
const int ncomp = 1 + 2*(sm->chroma != NULL); |
| 596 |
> |
float min_coef[3], ymin, coef[3]; |
| 597 |
> |
int i, o, c; |
| 598 |
|
|
| 599 |
< |
for (i = n; --i; ) |
| 600 |
< |
if (sm->bsdf[i] < minv) |
| 601 |
< |
minv = sm->bsdf[i]; |
| 602 |
< |
for (i = n; i--; ) |
| 603 |
< |
sm->bsdf[i] -= minv; |
| 599 |
> |
min_coef[0] = min_coef[1] = min_coef[2] = FHUGE; |
| 600 |
> |
for (i = 0; i < sm->ninc; i++) |
| 601 |
> |
for (o = 0; o < sm->nout; o++) { |
| 602 |
> |
c = mBSDF_color(coef, sm, i, o); |
| 603 |
> |
while (c--) |
| 604 |
> |
if (coef[c] < min_coef[c]) |
| 605 |
> |
min_coef[c] = coef[c]; |
| 606 |
> |
} |
| 607 |
> |
ymin = 0; |
| 608 |
> |
for (c = ncomp; c--; ) |
| 609 |
> |
ymin += min_coef[c]; |
| 610 |
> |
if (ymin <= .01/M_PI) /* not worth bothering about? */ |
| 611 |
> |
return .0; |
| 612 |
> |
if (ncomp == 1) { /* subtract grayscale minimum */ |
| 613 |
> |
for (i = sm->ninc*sm->nout; i--; ) |
| 614 |
> |
sm->bsdf[i] -= ymin; |
| 615 |
> |
*cs = c_dfcolor; |
| 616 |
> |
return M_PI*ymin; |
| 617 |
> |
} |
| 618 |
> |
/* else subtract colored minimum */ |
| 619 |
> |
for (i = 0; i < sm->ninc; i++) |
| 620 |
> |
for (o = 0; o < sm->nout; o++) { |
| 621 |
> |
C_COLOR cxy; |
| 622 |
> |
c = mBSDF_color(coef, sm, i, o); |
| 623 |
> |
while (c--) |
| 624 |
> |
coef[c] = (coef[c] - min_coef[c]) / |
| 625 |
> |
mtx_RGB_coef[c]; |
| 626 |
> |
if (c_fromSharpRGB(coef, &cxy) > 1e-5) |
| 627 |
> |
mBSDF_chroma(sm,i,o) = c_encodeChroma(&cxy); |
| 628 |
> |
mBSDF_value(sm,i,o) -= ymin; |
| 629 |
> |
} |
| 630 |
> |
/* return colored minimum */ |
| 631 |
> |
for (i = 3; i--; ) |
| 632 |
> |
coef[i] = min_coef[i]/mtx_RGB_coef[i]; |
| 633 |
> |
c_fromSharpRGB(coef, cs); |
| 634 |
|
|
| 635 |
< |
return minv*M_PI; /* be sure to include multiplier */ |
| 635 |
> |
return M_PI*ymin; |
| 636 |
|
} |
| 637 |
|
|
| 638 |
< |
/* Extract and separate diffuse portion of BSDF */ |
| 639 |
< |
static void |
| 638 |
> |
/* Extract and separate diffuse portion of BSDF & convert color */ |
| 639 |
> |
static SDSpectralDF * |
| 640 |
|
extract_diffuse(SDValue *dv, SDSpectralDF *df) |
| 641 |
|
{ |
| 559 |
– |
int n; |
| 642 |
|
|
| 643 |
+ |
df = encode_chroma(df); /* reduce XYZ to Y + chroma */ |
| 644 |
|
if (df == NULL || df->ncomp <= 0) { |
| 645 |
|
dv->spec = c_dfcolor; |
| 646 |
|
dv->cieY = .0; |
| 647 |
< |
return; |
| 647 |
> |
return df; |
| 648 |
|
} |
| 649 |
< |
dv->spec = df->comp[0].cspec[0]; |
| 650 |
< |
dv->cieY = subtract_min((SDMat *)df->comp[0].dist); |
| 651 |
< |
/* in case of multiple components */ |
| 652 |
< |
for (n = df->ncomp; --n; ) { |
| 653 |
< |
double ymin = subtract_min((SDMat *)df->comp[n].dist); |
| 654 |
< |
c_cmix(&dv->spec, dv->cieY, &dv->spec, ymin, &df->comp[n].cspec[0]); |
| 572 |
< |
dv->cieY += ymin; |
| 573 |
< |
} |
| 574 |
< |
df->maxHemi -= dv->cieY; /* adjust minimum hemispherical */ |
| 575 |
< |
/* make sure everything is set */ |
| 576 |
< |
c_ccvt(&dv->spec, C_CSXY+C_CSSPEC); |
| 649 |
> |
/* subtract minimum value */ |
| 650 |
> |
dv->cieY = subtract_min(&dv->spec, (SDMat *)df->comp[0].dist); |
| 651 |
> |
df->maxHemi -= dv->cieY; /* adjust maximum hemispherical */ |
| 652 |
> |
|
| 653 |
> |
c_ccvt(&dv->spec, C_CSXY); /* make sure (x,y) is set */ |
| 654 |
> |
return df; |
| 655 |
|
} |
| 656 |
|
|
| 657 |
|
/* Load a BSDF matrix from an open XML file */ |
| 658 |
|
SDError |
| 659 |
|
SDloadMtx(SDData *sd, ezxml_t wtl) |
| 660 |
|
{ |
| 661 |
< |
ezxml_t wld, wdb; |
| 662 |
< |
int rowIn; |
| 663 |
< |
struct BSDF_data *dp; |
| 664 |
< |
char *txt; |
| 665 |
< |
int rval; |
| 588 |
< |
|
| 661 |
> |
ezxml_t wld, wdb; |
| 662 |
> |
int rowIn; |
| 663 |
> |
char *txt; |
| 664 |
> |
int rval; |
| 665 |
> |
/* basic checks and data ordering */ |
| 666 |
|
txt = ezxml_txt(ezxml_child(ezxml_child(wtl, |
| 667 |
|
"DataDefinition"), "IncidentDataStructure")); |
| 668 |
|
if (txt == NULL || !*txt) { |
| 681 |
|
sd->name); |
| 682 |
|
return SDEsupport; |
| 683 |
|
} |
| 684 |
< |
/* get angle basis */ |
| 685 |
< |
rval = load_angle_basis(ezxml_child(ezxml_child(wtl, |
| 686 |
< |
"DataDefinition"), "AngleBasis")); |
| 687 |
< |
if (rval < 0) |
| 688 |
< |
return convert_errcode(rval); |
| 689 |
< |
/* load BSDF components */ |
| 684 |
> |
/* get angle bases */ |
| 685 |
> |
for (wld = ezxml_child(ezxml_child(wtl, "DataDefinition"), "AngleBasis"); |
| 686 |
> |
wld != NULL; wld = wld->next) { |
| 687 |
> |
rval = load_angle_basis(wld); |
| 688 |
> |
if (rval < 0) |
| 689 |
> |
return convert_errcode(rval); |
| 690 |
> |
} |
| 691 |
> |
/* load BSDF components */ |
| 692 |
|
for (wld = ezxml_child(wtl, "WavelengthData"); |
| 693 |
|
wld != NULL; wld = wld->next) { |
| 694 |
< |
if (strcasecmp(ezxml_txt(ezxml_child(wld,"Wavelength")), |
| 695 |
< |
"Visible")) |
| 696 |
< |
continue; /* just visible for now */ |
| 694 |
> |
const char *cnm = ezxml_txt(ezxml_child(wld,"Wavelength")); |
| 695 |
> |
int ct = -1; |
| 696 |
> |
if (!strcasecmp(cnm, "Visible")) |
| 697 |
> |
ct = mtx_Y; |
| 698 |
> |
else if (!strcasecmp(cnm, "CIE-X")) |
| 699 |
> |
ct = mtx_X; |
| 700 |
> |
else if (!strcasecmp(cnm, "CIE-Z")) |
| 701 |
> |
ct = mtx_Z; |
| 702 |
> |
else |
| 703 |
> |
continue; |
| 704 |
|
for (wdb = ezxml_child(wld, "WavelengthDataBlock"); |
| 705 |
|
wdb != NULL; wdb = wdb->next) |
| 706 |
< |
if ((rval = load_bsdf_data(sd, wdb, rowIn)) < 0) |
| 706 |
> |
if ((rval = load_bsdf_data(sd, wdb, ct, rowIn)) < 0) |
| 707 |
|
return convert_errcode(rval); |
| 708 |
|
} |
| 709 |
< |
/* separate diffuse components */ |
| 710 |
< |
extract_diffuse(&sd->rLambFront, sd->rf); |
| 711 |
< |
extract_diffuse(&sd->rLambBack, sd->rb); |
| 712 |
< |
extract_diffuse(&sd->tLamb, sd->tf); |
| 713 |
< |
/* return success */ |
| 709 |
> |
/* separate diffuse components */ |
| 710 |
> |
sd->rf = extract_diffuse(&sd->rLambFront, sd->rf); |
| 711 |
> |
sd->rb = extract_diffuse(&sd->rLambBack, sd->rb); |
| 712 |
> |
if (sd->tf != NULL) |
| 713 |
> |
sd->tf = extract_diffuse(&sd->tLamb, sd->tf); |
| 714 |
> |
if (sd->tb != NULL) |
| 715 |
> |
sd->tb = extract_diffuse(&sd->tLamb, sd->tb); |
| 716 |
> |
/* return success */ |
| 717 |
|
return SDEnone; |
| 718 |
|
} |
| 719 |
|
|
| 720 |
|
/* Get Matrix BSDF value */ |
| 721 |
|
static int |
| 722 |
|
SDgetMtxBSDF(float coef[SDmaxCh], const FVECT outVec, |
| 723 |
< |
const FVECT inVec, const void *dist) |
| 723 |
> |
const FVECT inVec, SDComponent *sdc) |
| 724 |
|
{ |
| 725 |
< |
const SDMat *dp = (const SDMat *)dist; |
| 725 |
> |
const SDMat *dp; |
| 726 |
|
int i_ndx, o_ndx; |
| 727 |
+ |
/* check arguments */ |
| 728 |
+ |
if ((coef == NULL) | (outVec == NULL) | (inVec == NULL) | (sdc == NULL) |
| 729 |
+ |
|| (dp = (SDMat *)sdc->dist) == NULL) |
| 730 |
+ |
return 0; |
| 731 |
|
/* get angle indices */ |
| 732 |
|
i_ndx = mBSDF_incndx(dp, inVec); |
| 733 |
|
o_ndx = mBSDF_outndx(dp, outVec); |
| 738 |
|
} |
| 739 |
|
if ((i_ndx < 0) | (o_ndx < 0)) |
| 740 |
|
return 0; /* nothing from this component */ |
| 741 |
< |
coef[0] = mBSDF_value(dp, i_ndx, o_ndx); |
| 742 |
< |
return 1; /* XXX monochrome for now */ |
| 741 |
> |
|
| 742 |
> |
return mBSDF_color(coef, dp, i_ndx, o_ndx); |
| 743 |
|
} |
| 744 |
|
|
| 745 |
< |
/* Query solid angle for vector */ |
| 745 |
> |
/* Query solid angle for vector(s) */ |
| 746 |
|
static SDError |
| 747 |
|
SDqueryMtxProjSA(double *psa, const FVECT v1, const RREAL *v2, |
| 748 |
< |
int qflags, const void *dist) |
| 748 |
> |
int qflags, SDComponent *sdc) |
| 749 |
|
{ |
| 750 |
< |
const SDMat *dp = (const SDMat *)dist; |
| 750 |
> |
const SDMat *dp; |
| 751 |
|
double inc_psa, out_psa; |
| 752 |
|
/* check arguments */ |
| 753 |
< |
if ((psa == NULL) | (v1 == NULL) | (dp == NULL)) |
| 753 |
> |
if ((psa == NULL) | (v1 == NULL) | (sdc == NULL) || |
| 754 |
> |
(dp = (SDMat *)sdc->dist) == NULL) |
| 755 |
|
return SDEargument; |
| 756 |
|
if (v2 == NULL) |
| 757 |
|
v2 = v1; |
| 758 |
|
/* get projected solid angles */ |
| 759 |
|
out_psa = mBSDF_outohm(dp, mBSDF_outndx(dp, v1)); |
| 760 |
|
inc_psa = mBSDF_incohm(dp, mBSDF_incndx(dp, v2)); |
| 761 |
< |
if ((out_psa <= 0) & (inc_psa <= 0)) { |
| 761 |
> |
if ((v1 != v2) & (out_psa <= 0) & (inc_psa <= 0)) { |
| 762 |
|
inc_psa = mBSDF_outohm(dp, mBSDF_outndx(dp, v2)); |
| 763 |
|
out_psa = mBSDF_incohm(dp, mBSDF_incndx(dp, v1)); |
| 764 |
|
} |
| 765 |
|
|
| 766 |
|
switch (qflags) { /* record based on flag settings */ |
| 673 |
– |
case SDqueryVal: |
| 674 |
– |
psa[0] = .0; |
| 675 |
– |
/* fall through */ |
| 767 |
|
case SDqueryMax: |
| 768 |
|
if (inc_psa > psa[0]) |
| 769 |
|
psa[0] = inc_psa; |
| 771 |
|
psa[0] = out_psa; |
| 772 |
|
break; |
| 773 |
|
case SDqueryMin+SDqueryMax: |
| 774 |
< |
if (inc_psa > psa[0]) |
| 774 |
> |
if (inc_psa > psa[1]) |
| 775 |
|
psa[1] = inc_psa; |
| 776 |
< |
if (out_psa > psa[0]) |
| 776 |
> |
if (out_psa > psa[1]) |
| 777 |
|
psa[1] = out_psa; |
| 778 |
|
/* fall through */ |
| 779 |
+ |
case SDqueryVal: |
| 780 |
+ |
if (qflags == SDqueryVal) |
| 781 |
+ |
psa[0] = M_PI; |
| 782 |
+ |
/* fall through */ |
| 783 |
|
case SDqueryMin: |
| 784 |
|
if ((inc_psa > 0) & (inc_psa < psa[0])) |
| 785 |
|
psa[0] = inc_psa; |
| 826 |
|
static const SDCDst * |
| 827 |
|
SDgetMtxCDist(const FVECT inVec, SDComponent *sdc) |
| 828 |
|
{ |
| 829 |
< |
SDMat *dp = (SDMat *)sdc->dist; |
| 829 |
> |
SDMat *dp; |
| 830 |
|
int reverse; |
| 831 |
|
SDMatCDst myCD; |
| 832 |
|
SDMatCDst *cd, *cdlast; |
| 833 |
|
/* check arguments */ |
| 834 |
< |
if ((inVec == NULL) | (dp == NULL)) |
| 834 |
> |
if ((inVec == NULL) | (sdc == NULL) || |
| 835 |
> |
(dp = (SDMat *)sdc->dist) == NULL) |
| 836 |
|
return NULL; |
| 837 |
|
memset(&myCD, 0, sizeof(myCD)); |
| 838 |
|
myCD.indx = mBSDF_incndx(dp, inVec); |
| 851 |
|
reverse = 1; |
| 852 |
|
} |
| 853 |
|
cdlast = NULL; /* check for it in cache list */ |
| 854 |
< |
for (cd = (SDMatCDst *)sdc->cdList; |
| 855 |
< |
cd != NULL; cd = (SDMatCDst *)cd->next) { |
| 854 |
> |
/* PLACE MUTEX LOCK HERE FOR THREAD-SAFE */ |
| 855 |
> |
for (cd = (SDMatCDst *)sdc->cdList; cd != NULL; |
| 856 |
> |
cdlast = cd, cd = cd->next) |
| 857 |
|
if (cd->indx == myCD.indx && (cd->calen == myCD.calen) & |
| 858 |
|
(cd->ob_priv == myCD.ob_priv) & |
| 859 |
|
(cd->ob_vec == myCD.ob_vec)) |
| 860 |
|
break; |
| 764 |
– |
cdlast = cd; |
| 765 |
– |
} |
| 861 |
|
if (cd == NULL) { /* need to allocate new entry */ |
| 862 |
|
cd = (SDMatCDst *)malloc(sizeof(SDMatCDst) + |
| 863 |
< |
myCD.calen*sizeof(myCD.carr[0])); |
| 863 |
> |
sizeof(myCD.carr[0])*myCD.calen); |
| 864 |
|
if (cd == NULL) |
| 865 |
|
return NULL; |
| 866 |
|
*cd = myCD; /* compute cumulative distribution */ |
| 872 |
|
} |
| 873 |
|
if (cdlast != NULL) { /* move entry to head of cache list */ |
| 874 |
|
cdlast->next = cd->next; |
| 875 |
< |
cd->next = sdc->cdList; |
| 875 |
> |
cd->next = (SDMatCDst *)sdc->cdList; |
| 876 |
|
sdc->cdList = (SDCDst *)cd; |
| 877 |
|
} |
| 878 |
+ |
/* END MUTEX LOCK */ |
| 879 |
|
return (SDCDst *)cd; /* ready to go */ |
| 880 |
|
} |
| 881 |
|
|
| 882 |
|
/* Sample cumulative distribution */ |
| 883 |
|
static SDError |
| 884 |
< |
SDsampMtxCDist(FVECT outVec, double randX, const SDCDst *cdp) |
| 884 |
> |
SDsampMtxCDist(FVECT ioVec, double randX, const SDCDst *cdp) |
| 885 |
|
{ |
| 886 |
|
const unsigned maxval = ~0; |
| 887 |
|
const SDMatCDst *mcd = (const SDMatCDst *)cdp; |
| 888 |
|
const unsigned target = randX*maxval; |
| 889 |
|
int i, iupper, ilower; |
| 890 |
|
/* check arguments */ |
| 891 |
< |
if ((outVec == NULL) | (mcd == NULL)) |
| 891 |
> |
if ((ioVec == NULL) | (mcd == NULL)) |
| 892 |
|
return SDEargument; |
| 893 |
|
/* binary search to find index */ |
| 894 |
|
ilower = 0; iupper = mcd->calen; |
| 895 |
|
while ((i = (iupper + ilower) >> 1) != ilower) |
| 896 |
< |
if ((long)target >= (long)mcd->carr[i]) |
| 896 |
> |
if (target >= mcd->carr[i]) |
| 897 |
|
ilower = i; |
| 898 |
|
else |
| 899 |
|
iupper = i; |
| 901 |
|
randX = (randX*maxval - mcd->carr[ilower]) / |
| 902 |
|
(double)(mcd->carr[iupper] - mcd->carr[ilower]); |
| 903 |
|
/* convert index to vector */ |
| 904 |
< |
if ((*mcd->ob_vec)(outVec, i+randX, mcd->ob_priv)) |
| 904 |
> |
if ((*mcd->ob_vec)(ioVec, i+randX, mcd->ob_priv)) |
| 905 |
|
return SDEnone; |
| 906 |
< |
strcpy(SDerrorDetail, "BSDF sampling fault"); |
| 906 |
> |
strcpy(SDerrorDetail, "Matrix BSDF sampling fault"); |
| 907 |
|
return SDEinternal; |
| 908 |
|
} |
| 909 |
|
|
| 910 |
|
/* Fixed resolution BSDF methods */ |
| 911 |
< |
SDFunc SDhandleMtx = { |
| 911 |
> |
const SDFunc SDhandleMtx = { |
| 912 |
|
&SDgetMtxBSDF, |
| 913 |
|
&SDqueryMtxProjSA, |
| 914 |
|
&SDgetMtxCDist, |
