| 1 |
#ifndef lint
|
| 2 |
static const char RCSid[] = "$Id: bsdfrep.c,v 2.35 2021/09/07 20:13:13 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.;
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| 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.))
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| 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
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| 105 |
use_symmetry(FVECT vec)
|
| 106 |
{
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| 107 |
double phi = get_phi360(vec);
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| 108 |
/* because of -0. issue */
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| 109 |
while (phi >= 360.) phi -= 360.;
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| 110 |
while (phi < 0.) phi += 360.;
|
| 111 |
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| 112 |
switch (inp_coverage) {
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| 113 |
case INP_QUAD1|INP_QUAD2|INP_QUAD3|INP_QUAD4:
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| 114 |
break;
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| 115 |
case INP_QUAD1|INP_QUAD2:
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| 116 |
if ((-FTINY > phi) | (phi > 180.+FTINY))
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| 117 |
goto mir_y;
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| 118 |
break;
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| 119 |
case INP_QUAD2|INP_QUAD3:
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| 120 |
if ((90.-FTINY > phi) | (phi > 270.+FTINY))
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| 121 |
goto mir_x;
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| 122 |
break;
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| 123 |
case INP_QUAD3|INP_QUAD4:
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| 124 |
if ((180.-FTINY > phi) | (phi > 360.+FTINY))
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| 125 |
goto mir_y;
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| 126 |
break;
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| 127 |
case INP_QUAD4|INP_QUAD1:
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| 128 |
if ((270.-FTINY > phi) & (phi > 90.+FTINY))
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| 129 |
goto mir_x;
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| 130 |
break;
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| 131 |
case INP_QUAD1:
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| 132 |
if ((-FTINY > phi) | (phi > 90.+FTINY))
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| 133 |
switch ((int)(phi*(1./90.))) {
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| 134 |
case 1: goto mir_x;
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| 135 |
case 2: goto mir_xy;
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| 136 |
case 3: goto mir_y;
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| 137 |
}
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| 138 |
break;
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| 139 |
case INP_QUAD2:
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| 140 |
if ((90.-FTINY > phi) | (phi > 180.+FTINY))
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| 141 |
switch ((int)(phi*(1./90.))) {
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| 142 |
case 0: goto mir_x;
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| 143 |
case 2: goto mir_y;
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| 144 |
case 3: goto mir_xy;
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| 145 |
}
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| 146 |
break;
|
| 147 |
case INP_QUAD3:
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| 148 |
if ((180.-FTINY > phi) | (phi > 270.+FTINY))
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| 149 |
switch ((int)(phi*(1./90.))) {
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| 150 |
case 0: goto mir_xy;
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| 151 |
case 1: goto mir_y;
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| 152 |
case 3: goto mir_x;
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| 153 |
}
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| 154 |
break;
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| 155 |
case INP_QUAD4:
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| 156 |
if ((270.-FTINY > phi) | (phi > 360.+FTINY))
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| 157 |
switch ((int)(phi*(1./90.))) {
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| 158 |
case 0: goto mir_y;
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| 159 |
case 1: goto mir_xy;
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| 160 |
case 2: goto mir_x;
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| 161 |
}
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| 162 |
break;
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| 163 |
default:
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| 164 |
fprintf(stderr, "%s: Illegal input coverage (%d)\n",
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| 165 |
progname, inp_coverage);
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| 166 |
exit(1);
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| 167 |
}
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| 168 |
return(0); /* in range */
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| 169 |
mir_x:
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| 170 |
vec[0] = -vec[0];
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| 171 |
return(MIRROR_X);
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| 172 |
mir_y:
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| 173 |
vec[1] = -vec[1];
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| 174 |
return(MIRROR_Y);
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| 175 |
mir_xy:
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| 176 |
vec[0] = -vec[0];
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| 177 |
vec[1] = -vec[1];
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| 178 |
return(MIRROR_X|MIRROR_Y);
|
| 179 |
}
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| 180 |
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| 181 |
/* Reverse symmetry based on what was done before */
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| 182 |
void
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| 183 |
rev_symmetry(FVECT vec, int sym)
|
| 184 |
{
|
| 185 |
if (sym & MIRROR_X)
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| 186 |
vec[0] = -vec[0];
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| 187 |
if (sym & MIRROR_Y)
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| 188 |
vec[1] = -vec[1];
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| 189 |
}
|
| 190 |
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| 191 |
/* Reverse symmetry for an RBF distribution */
|
| 192 |
void
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| 193 |
rev_rbf_symmetry(RBFNODE *rbf, int sym)
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| 194 |
{
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| 195 |
int n;
|
| 196 |
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| 197 |
rev_symmetry(rbf->invec, sym);
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| 198 |
if (sym & MIRROR_X)
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| 199 |
for (n = rbf->nrbf; n-- > 0; )
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| 200 |
rbf->rbfa[n].gx = grid_res-1 - rbf->rbfa[n].gx;
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| 201 |
if (sym & MIRROR_Y)
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for (n = rbf->nrbf; n-- > 0; )
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| 203 |
rbf->rbfa[n].gy = grid_res-1 - rbf->rbfa[n].gy;
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| 204 |
}
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| 205 |
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| 206 |
/* Rotate RBF to correspond to given incident vector */
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| 207 |
void
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| 208 |
rotate_rbf(RBFNODE *rbf, const FVECT invec)
|
| 209 |
{
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| 210 |
static const FVECT vnorm = {.0, .0, 1.};
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| 211 |
const double phi = atan2(invec[1],invec[0]) -
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| 212 |
atan2(rbf->invec[1],rbf->invec[0]);
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| 213 |
FVECT outvec;
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| 214 |
int pos[2];
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| 215 |
int n;
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| 216 |
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| 217 |
for (n = (cos(phi) < 1.-FTINY)*rbf->nrbf; n-- > 0; ) {
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| 218 |
ovec_from_pos(outvec, rbf->rbfa[n].gx, rbf->rbfa[n].gy);
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| 219 |
spinvector(outvec, outvec, vnorm, phi);
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| 220 |
pos_from_vec(pos, outvec);
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| 221 |
rbf->rbfa[n].gx = pos[0];
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| 222 |
rbf->rbfa[n].gy = pos[1];
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}
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| 224 |
VCOPY(rbf->invec, invec);
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| 225 |
}
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| 226 |
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| 227 |
/* Compute outgoing vector from grid position */
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| 228 |
void
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| 229 |
ovec_from_pos(FVECT vec, int xpos, int ypos)
|
| 230 |
{
|
| 231 |
double uv[2];
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| 232 |
double r2;
|
| 233 |
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| 234 |
SDsquare2disk(uv, (xpos+.5)/grid_res, (ypos+.5)/grid_res);
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| 235 |
/* uniform hemispherical projection */
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| 236 |
r2 = uv[0]*uv[0] + uv[1]*uv[1];
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| 237 |
vec[0] = vec[1] = sqrt(2. - r2);
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| 238 |
vec[0] *= uv[0];
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| 239 |
vec[1] *= uv[1];
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| 240 |
vec[2] = output_orient*(1. - r2);
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| 241 |
}
|
| 242 |
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| 243 |
/* Compute grid position from normalized input/output vector */
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| 244 |
void
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| 245 |
pos_from_vec(int pos[2], const FVECT vec)
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| 246 |
{
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| 247 |
double sq[2]; /* uniform hemispherical projection */
|
| 248 |
double norm = 1./sqrt(1. + fabs(vec[2]));
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| 249 |
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| 250 |
SDdisk2square(sq, vec[0]*norm, vec[1]*norm);
|
| 251 |
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| 252 |
pos[0] = (int)(sq[0]*grid_res);
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| 253 |
pos[1] = (int)(sq[1]*grid_res);
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| 254 |
}
|
| 255 |
|
| 256 |
/* Compute volume associated with Gaussian lobe */
|
| 257 |
double
|
| 258 |
rbf_volume(const RBFVAL *rbfp)
|
| 259 |
{
|
| 260 |
double rad = R2ANG(rbfp->crad);
|
| 261 |
FVECT odir;
|
| 262 |
double elev, integ;
|
| 263 |
/* infinite integral approximation */
|
| 264 |
integ = (2.*M_PI) * rbfp->peak * rad*rad;
|
| 265 |
/* check if we're near horizon */
|
| 266 |
ovec_from_pos(odir, rbfp->gx, rbfp->gy);
|
| 267 |
elev = output_orient*odir[2];
|
| 268 |
/* apply cut-off correction if > 1% */
|
| 269 |
if (elev < 2.8*rad) {
|
| 270 |
/* elev = asin(elev); /* this is so crude, anyway... */
|
| 271 |
integ *= 1. - .5*exp(-.5*elev*elev/(rad*rad));
|
| 272 |
}
|
| 273 |
return(integ);
|
| 274 |
}
|
| 275 |
|
| 276 |
/* Evaluate BSDF at the given normalized outgoing direction in color */
|
| 277 |
SDError
|
| 278 |
eval_rbfcol(SDValue *sv, const RBFNODE *rp, const FVECT outvec)
|
| 279 |
{
|
| 280 |
const double rfact2 = (38./M_PI/M_PI)*(grid_res*grid_res);
|
| 281 |
int pos[2];
|
| 282 |
double res = 0;
|
| 283 |
double usum = 0, vsum = 0;
|
| 284 |
const RBFVAL *rbfp;
|
| 285 |
FVECT odir;
|
| 286 |
double rad2;
|
| 287 |
int n;
|
| 288 |
/* assign default value */
|
| 289 |
sv->spec = c_dfcolor;
|
| 290 |
sv->cieY = bsdf_min;
|
| 291 |
/* check for wrong side */
|
| 292 |
if (outvec[2] > 0 ^ output_orient > 0) {
|
| 293 |
strcpy(SDerrorDetail, "Wrong-side scattering query");
|
| 294 |
return(SDEargument);
|
| 295 |
}
|
| 296 |
if (rp == NULL) /* return minimum if no information avail. */
|
| 297 |
return(SDEnone);
|
| 298 |
/* optimization for fast lobe culling */
|
| 299 |
pos_from_vec(pos, outvec);
|
| 300 |
/* sum radial basis function */
|
| 301 |
rbfp = rp->rbfa;
|
| 302 |
for (n = rp->nrbf; n--; rbfp++) {
|
| 303 |
int d2 = (pos[0]-rbfp->gx)*(pos[0]-rbfp->gx) +
|
| 304 |
(pos[1]-rbfp->gy)*(pos[1]-rbfp->gy);
|
| 305 |
double val;
|
| 306 |
rad2 = R2ANG(rbfp->crad);
|
| 307 |
rad2 *= rad2;
|
| 308 |
if (d2 > rad2*rfact2)
|
| 309 |
continue;
|
| 310 |
ovec_from_pos(odir, rbfp->gx, rbfp->gy);
|
| 311 |
val = rbfp->peak * exp((DOT(odir,outvec) - 1.) / rad2);
|
| 312 |
if (rbf_colorimetry == RBCtristimulus) {
|
| 313 |
usum += val * (rbfp->chroma & 0xff);
|
| 314 |
vsum += val * (rbfp->chroma>>8 & 0xff);
|
| 315 |
}
|
| 316 |
res += val;
|
| 317 |
}
|
| 318 |
sv->cieY = res / COSF(outvec[2]);
|
| 319 |
if (sv->cieY < bsdf_min) { /* never return less than bsdf_min */
|
| 320 |
sv->cieY = bsdf_min;
|
| 321 |
} else if (rbf_colorimetry == RBCtristimulus) {
|
| 322 |
C_CHROMA cres = (int)(usum/res + frandom());
|
| 323 |
cres |= (int)(vsum/res + frandom()) << 8;
|
| 324 |
c_decodeChroma(&sv->spec, cres);
|
| 325 |
}
|
| 326 |
return(SDEnone);
|
| 327 |
}
|
| 328 |
|
| 329 |
/* Evaluate BSDF at the given normalized outgoing direction in Y */
|
| 330 |
double
|
| 331 |
eval_rbfrep(const RBFNODE *rp, const FVECT outvec)
|
| 332 |
{
|
| 333 |
SDValue sv;
|
| 334 |
|
| 335 |
if (eval_rbfcol(&sv, rp, outvec) == SDEnone)
|
| 336 |
return(sv.cieY);
|
| 337 |
|
| 338 |
return(0.0);
|
| 339 |
}
|
| 340 |
|
| 341 |
/* Insert a new directional scattering function in our global list */
|
| 342 |
int
|
| 343 |
insert_dsf(RBFNODE *newrbf)
|
| 344 |
{
|
| 345 |
RBFNODE *rbf, *rbf_last;
|
| 346 |
int pos;
|
| 347 |
/* check for redundant meas. */
|
| 348 |
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next)
|
| 349 |
if (DOT(rbf->invec, newrbf->invec) >= 1.-FTINY) {
|
| 350 |
fprintf(stderr,
|
| 351 |
"%s: Duplicate incident measurement ignored at (%.1f,%.1f)\n",
|
| 352 |
progname, get_theta180(newrbf->invec),
|
| 353 |
get_phi360(newrbf->invec));
|
| 354 |
free(newrbf);
|
| 355 |
return(-1);
|
| 356 |
}
|
| 357 |
/* keep in ascending theta order */
|
| 358 |
for (rbf_last = NULL, rbf = dsf_list; rbf != NULL;
|
| 359 |
rbf_last = rbf, rbf = rbf->next)
|
| 360 |
if (single_plane_incident && input_orient*rbf->invec[2] <
|
| 361 |
input_orient*newrbf->invec[2])
|
| 362 |
break;
|
| 363 |
if (rbf_last == NULL) { /* insert new node in list */
|
| 364 |
newrbf->ord = 0;
|
| 365 |
newrbf->next = dsf_list;
|
| 366 |
dsf_list = newrbf;
|
| 367 |
} else {
|
| 368 |
newrbf->ord = rbf_last->ord + 1;
|
| 369 |
newrbf->next = rbf;
|
| 370 |
rbf_last->next = newrbf;
|
| 371 |
}
|
| 372 |
rbf_last = newrbf;
|
| 373 |
while (rbf != NULL) { /* update ordinal positions */
|
| 374 |
rbf->ord = rbf_last->ord + 1;
|
| 375 |
rbf_last = rbf;
|
| 376 |
rbf = rbf->next;
|
| 377 |
}
|
| 378 |
return(newrbf->ord);
|
| 379 |
}
|
| 380 |
|
| 381 |
/* Get the DSF indicated by its ordinal position */
|
| 382 |
RBFNODE *
|
| 383 |
get_dsf(int ord)
|
| 384 |
{
|
| 385 |
RBFNODE *rbf;
|
| 386 |
|
| 387 |
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next)
|
| 388 |
if (rbf->ord == ord)
|
| 389 |
return(rbf);
|
| 390 |
return(NULL);
|
| 391 |
}
|
| 392 |
|
| 393 |
/* Get triangle surface orientation (unnormalized) */
|
| 394 |
void
|
| 395 |
tri_orient(FVECT vres, const FVECT v1, const FVECT v2, const FVECT v3)
|
| 396 |
{
|
| 397 |
FVECT v2minus1, v3minus2;
|
| 398 |
|
| 399 |
VSUB(v2minus1, v2, v1);
|
| 400 |
VSUB(v3minus2, v3, v2);
|
| 401 |
VCROSS(vres, v2minus1, v3minus2);
|
| 402 |
}
|
| 403 |
|
| 404 |
/* Determine if vertex order is reversed (inward normal) */
|
| 405 |
int
|
| 406 |
is_rev_tri(const FVECT v1, const FVECT v2, const FVECT v3)
|
| 407 |
{
|
| 408 |
FVECT tor;
|
| 409 |
|
| 410 |
tri_orient(tor, v1, v2, v3);
|
| 411 |
|
| 412 |
return(DOT(tor, v2) < 0.);
|
| 413 |
}
|
| 414 |
|
| 415 |
/* Find vertices completing triangles on either side of the given edge */
|
| 416 |
int
|
| 417 |
get_triangles(RBFNODE *rbfv[2], const MIGRATION *mig)
|
| 418 |
{
|
| 419 |
const MIGRATION *ej1, *ej2;
|
| 420 |
RBFNODE *tv;
|
| 421 |
|
| 422 |
rbfv[0] = rbfv[1] = NULL;
|
| 423 |
if (mig == NULL)
|
| 424 |
return(0);
|
| 425 |
for (ej1 = mig->rbfv[0]->ejl; ej1 != NULL;
|
| 426 |
ej1 = nextedge(mig->rbfv[0],ej1)) {
|
| 427 |
if (ej1 == mig)
|
| 428 |
continue;
|
| 429 |
tv = opp_rbf(mig->rbfv[0],ej1);
|
| 430 |
for (ej2 = tv->ejl; ej2 != NULL; ej2 = nextedge(tv,ej2))
|
| 431 |
if (opp_rbf(tv,ej2) == mig->rbfv[1]) {
|
| 432 |
rbfv[is_rev_tri(mig->rbfv[0]->invec,
|
| 433 |
mig->rbfv[1]->invec,
|
| 434 |
tv->invec)] = tv;
|
| 435 |
break;
|
| 436 |
}
|
| 437 |
}
|
| 438 |
return((rbfv[0] != NULL) + (rbfv[1] != NULL));
|
| 439 |
}
|
| 440 |
|
| 441 |
/* Return single-lobe specular RBF for the given incident direction */
|
| 442 |
RBFNODE *
|
| 443 |
def_rbf_spec(const FVECT invec)
|
| 444 |
{
|
| 445 |
RBFNODE *rbf;
|
| 446 |
FVECT ovec;
|
| 447 |
int pos[2];
|
| 448 |
|
| 449 |
if (input_orient > 0 ^ invec[2] > 0) /* wrong side? */
|
| 450 |
return(NULL);
|
| 451 |
if ((bsdf_spec_val <= bsdf_min) | (bsdf_spec_rad <= 0))
|
| 452 |
return(NULL); /* nothing set */
|
| 453 |
rbf = (RBFNODE *)malloc(sizeof(RBFNODE));
|
| 454 |
if (rbf == NULL)
|
| 455 |
return(NULL);
|
| 456 |
ovec[0] = -invec[0];
|
| 457 |
ovec[1] = -invec[1];
|
| 458 |
ovec[2] = invec[2]*(2*(input_orient==output_orient) - 1);
|
| 459 |
pos_from_vec(pos, ovec);
|
| 460 |
rbf->ord = 0;
|
| 461 |
rbf->next = NULL;
|
| 462 |
rbf->ejl = NULL;
|
| 463 |
VCOPY(rbf->invec, invec);
|
| 464 |
rbf->nrbf = 1;
|
| 465 |
rbf->rbfa[0].peak = bsdf_spec_val * COSF(ovec[2]);
|
| 466 |
rbf->rbfa[0].chroma = c_dfchroma;
|
| 467 |
rbf->rbfa[0].crad = ANG2R(bsdf_spec_rad);
|
| 468 |
rbf->rbfa[0].gx = pos[0];
|
| 469 |
rbf->rbfa[0].gy = pos[1];
|
| 470 |
rbf->vtotal = rbf_volume(rbf->rbfa);
|
| 471 |
return(rbf);
|
| 472 |
}
|
| 473 |
|
| 474 |
/* Advect and allocate new RBF along edge (internal call) */
|
| 475 |
RBFNODE *
|
| 476 |
e_advect_rbf(const MIGRATION *mig, const FVECT invec, int lobe_lim)
|
| 477 |
{
|
| 478 |
double cthresh = FTINY;
|
| 479 |
RBFNODE *rbf;
|
| 480 |
int n, i, j;
|
| 481 |
double t, full_dist;
|
| 482 |
/* get relative position */
|
| 483 |
t = Acos(DOT(invec, mig->rbfv[0]->invec));
|
| 484 |
if (t <= .001) { /* near first DSF */
|
| 485 |
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(mig->rbfv[0]->nrbf-1);
|
| 486 |
rbf = (RBFNODE *)malloc(n);
|
| 487 |
if (rbf == NULL)
|
| 488 |
goto memerr;
|
| 489 |
memcpy(rbf, mig->rbfv[0], n); /* just duplicate */
|
| 490 |
rbf->next = NULL; rbf->ejl = NULL;
|
| 491 |
return(rbf);
|
| 492 |
}
|
| 493 |
full_dist = acos(DOT(mig->rbfv[0]->invec, mig->rbfv[1]->invec));
|
| 494 |
if (t >= full_dist-.001) { /* near second DSF */
|
| 495 |
n = sizeof(RBFNODE) + sizeof(RBFVAL)*(mig->rbfv[1]->nrbf-1);
|
| 496 |
rbf = (RBFNODE *)malloc(n);
|
| 497 |
if (rbf == NULL)
|
| 498 |
goto memerr;
|
| 499 |
memcpy(rbf, mig->rbfv[1], n); /* just duplicate */
|
| 500 |
rbf->next = NULL; rbf->ejl = NULL;
|
| 501 |
return(rbf);
|
| 502 |
}
|
| 503 |
t /= full_dist;
|
| 504 |
tryagain:
|
| 505 |
n = 0; /* count migrating particles */
|
| 506 |
for (i = 0; i < mtx_nrows(mig); i++)
|
| 507 |
for (j = 0; j < mtx_ncols(mig); j++)
|
| 508 |
n += (mtx_coef(mig,i,j) > cthresh);
|
| 509 |
/* are we over our limit? */
|
| 510 |
if ((lobe_lim > 0) & (n > lobe_lim)) {
|
| 511 |
cthresh = cthresh*2. + 10.*FTINY;
|
| 512 |
goto tryagain;
|
| 513 |
}
|
| 514 |
#ifdef DEBUG
|
| 515 |
fprintf(stderr, "Input RBFs have %d, %d nodes -> output has %d\n",
|
| 516 |
mig->rbfv[0]->nrbf, mig->rbfv[1]->nrbf, n);
|
| 517 |
#endif
|
| 518 |
rbf = (RBFNODE *)malloc(sizeof(RBFNODE) + sizeof(RBFVAL)*(n-1));
|
| 519 |
if (rbf == NULL)
|
| 520 |
goto memerr;
|
| 521 |
rbf->next = NULL; rbf->ejl = NULL;
|
| 522 |
VCOPY(rbf->invec, invec);
|
| 523 |
rbf->nrbf = n;
|
| 524 |
rbf->vtotal = 1.-t + t*mig->rbfv[1]->vtotal/mig->rbfv[0]->vtotal;
|
| 525 |
n = 0; /* advect RBF lobes */
|
| 526 |
for (i = 0; i < mtx_nrows(mig); i++) {
|
| 527 |
const RBFVAL *rbf0i = &mig->rbfv[0]->rbfa[i];
|
| 528 |
const float peak0 = rbf0i->peak;
|
| 529 |
const double rad0 = R2ANG(rbf0i->crad);
|
| 530 |
C_COLOR cc0;
|
| 531 |
FVECT v0;
|
| 532 |
float mv;
|
| 533 |
ovec_from_pos(v0, rbf0i->gx, rbf0i->gy);
|
| 534 |
c_decodeChroma(&cc0, rbf0i->chroma);
|
| 535 |
for (j = 0; j < mtx_ncols(mig); j++)
|
| 536 |
if ((mv = mtx_coef(mig,i,j)) > cthresh) {
|
| 537 |
const RBFVAL *rbf1j = &mig->rbfv[1]->rbfa[j];
|
| 538 |
double rad2;
|
| 539 |
FVECT v;
|
| 540 |
int pos[2];
|
| 541 |
rad2 = R2ANG(rbf1j->crad);
|
| 542 |
rad2 = rad0*rad0*(1.-t) + rad2*rad2*t;
|
| 543 |
rbf->rbfa[n].peak = peak0 * mv * rbf->vtotal *
|
| 544 |
rad0*rad0/rad2;
|
| 545 |
if (rbf_colorimetry == RBCtristimulus) {
|
| 546 |
C_COLOR cres;
|
| 547 |
c_decodeChroma(&cres, rbf1j->chroma);
|
| 548 |
c_cmix(&cres, 1.-t, &cc0, t, &cres);
|
| 549 |
rbf->rbfa[n].chroma = c_encodeChroma(&cres);
|
| 550 |
} else
|
| 551 |
rbf->rbfa[n].chroma = c_dfchroma;
|
| 552 |
rbf->rbfa[n].crad = ANG2R(sqrt(rad2));
|
| 553 |
ovec_from_pos(v, rbf1j->gx, rbf1j->gy);
|
| 554 |
geodesic(v, v0, v, t, GEOD_REL);
|
| 555 |
pos_from_vec(pos, v);
|
| 556 |
rbf->rbfa[n].gx = pos[0];
|
| 557 |
rbf->rbfa[n].gy = pos[1];
|
| 558 |
++n;
|
| 559 |
}
|
| 560 |
}
|
| 561 |
rbf->vtotal *= mig->rbfv[0]->vtotal; /* turn ratio into actual */
|
| 562 |
return(rbf);
|
| 563 |
memerr:
|
| 564 |
fprintf(stderr, "%s: Out of memory in e_advect_rbf()\n", progname);
|
| 565 |
exit(1);
|
| 566 |
return(NULL); /* pro forma return */
|
| 567 |
}
|
| 568 |
|
| 569 |
/* Clear our BSDF representation and free memory */
|
| 570 |
void
|
| 571 |
clear_bsdf_rep(void)
|
| 572 |
{
|
| 573 |
while (mig_list != NULL) {
|
| 574 |
MIGRATION *mig = mig_list;
|
| 575 |
mig_list = mig->next;
|
| 576 |
free(mig);
|
| 577 |
}
|
| 578 |
while (dsf_list != NULL) {
|
| 579 |
RBFNODE *rbf = dsf_list;
|
| 580 |
dsf_list = rbf->next;
|
| 581 |
free(rbf);
|
| 582 |
}
|
| 583 |
bsdf_name[0] = '\0';
|
| 584 |
bsdf_manuf[0] = '\0';
|
| 585 |
inp_coverage = 0;
|
| 586 |
single_plane_incident = -1;
|
| 587 |
input_orient = output_orient = 0;
|
| 588 |
rbf_colorimetry = RBCunknown;
|
| 589 |
grid_res = GRIDRES;
|
| 590 |
memset(bsdf_hist, 0, sizeof(bsdf_hist));
|
| 591 |
bsdf_min = 0;
|
| 592 |
bsdf_spec_val = 0;
|
| 593 |
bsdf_spec_rad = 0;
|
| 594 |
}
|
| 595 |
|
| 596 |
/* Write our BSDF mesh interpolant out to the given binary stream */
|
| 597 |
void
|
| 598 |
save_bsdf_rep(FILE *ofp)
|
| 599 |
{
|
| 600 |
RBFNODE *rbf;
|
| 601 |
MIGRATION *mig;
|
| 602 |
int i, n;
|
| 603 |
/* finish header */
|
| 604 |
if (bsdf_name[0])
|
| 605 |
fprintf(ofp, "NAME=%s\n", bsdf_name);
|
| 606 |
if (bsdf_manuf[0])
|
| 607 |
fprintf(ofp, "MANUFACT=%s\n", bsdf_manuf);
|
| 608 |
fprintf(ofp, "SYMMETRY=%d\n", !single_plane_incident * inp_coverage);
|
| 609 |
fprintf(ofp, "IO_SIDES= %d %d\n", input_orient, output_orient);
|
| 610 |
fprintf(ofp, "COLORIMETRY=%s\n", RBCident[rbf_colorimetry]);
|
| 611 |
fprintf(ofp, "GRIDRES=%d\n", grid_res);
|
| 612 |
fprintf(ofp, "BSDFMIN=%g\n", bsdf_min);
|
| 613 |
if ((bsdf_spec_val > bsdf_min) & (bsdf_spec_rad > 0))
|
| 614 |
fprintf(ofp, "BSDFSPEC= %f %f\n", bsdf_spec_val, bsdf_spec_rad);
|
| 615 |
fputformat(BSDFREP_FMT, ofp);
|
| 616 |
fputc('\n', ofp);
|
| 617 |
putint(BSDFREP_MAGIC, 2, ofp);
|
| 618 |
/* write each DSF */
|
| 619 |
for (rbf = dsf_list; rbf != NULL; rbf = rbf->next) {
|
| 620 |
putint(rbf->ord, 4, ofp);
|
| 621 |
putflt(rbf->invec[0], ofp);
|
| 622 |
putflt(rbf->invec[1], ofp);
|
| 623 |
putflt(rbf->invec[2], ofp);
|
| 624 |
putflt(rbf->vtotal, ofp);
|
| 625 |
putint(rbf->nrbf, 4, ofp);
|
| 626 |
for (i = 0; i < rbf->nrbf; i++) {
|
| 627 |
putflt(rbf->rbfa[i].peak, ofp);
|
| 628 |
putint(rbf->rbfa[i].chroma, 2, ofp);
|
| 629 |
putint(rbf->rbfa[i].crad, 2, ofp);
|
| 630 |
putint(rbf->rbfa[i].gx, 2, ofp);
|
| 631 |
putint(rbf->rbfa[i].gy, 2, ofp);
|
| 632 |
}
|
| 633 |
}
|
| 634 |
putint(-1, 4, ofp); /* terminator */
|
| 635 |
/* write each migration matrix */
|
| 636 |
for (mig = mig_list; mig != NULL; mig = mig->next) {
|
| 637 |
int zerocnt = 0;
|
| 638 |
putint(mig->rbfv[0]->ord, 4, ofp);
|
| 639 |
putint(mig->rbfv[1]->ord, 4, ofp);
|
| 640 |
/* write out as sparse data */
|
| 641 |
n = mtx_nrows(mig) * mtx_ncols(mig);
|
| 642 |
for (i = 0; i < n; i++) {
|
| 643 |
if (zerocnt == 0xff) {
|
| 644 |
putint(0xff, 1, ofp); zerocnt = 0;
|
| 645 |
}
|
| 646 |
if (mig->mtx[i] != 0) {
|
| 647 |
putint(zerocnt, 1, ofp); zerocnt = 0;
|
| 648 |
putflt(mig->mtx[i], ofp);
|
| 649 |
} else
|
| 650 |
++zerocnt;
|
| 651 |
}
|
| 652 |
putint(zerocnt, 1, ofp);
|
| 653 |
}
|
| 654 |
putint(-1, 4, ofp); /* terminator */
|
| 655 |
putint(-1, 4, ofp);
|
| 656 |
if (fflush(ofp) == EOF) {
|
| 657 |
fprintf(stderr, "%s: error writing BSDF interpolant\n",
|
| 658 |
progname);
|
| 659 |
exit(1);
|
| 660 |
}
|
| 661 |
}
|
| 662 |
|
| 663 |
/* Check header line for critical information */
|
| 664 |
static int
|
| 665 |
headline(char *s, void *p)
|
| 666 |
{
|
| 667 |
char fmt[MAXFMTLEN];
|
| 668 |
int i;
|
| 669 |
|
| 670 |
if (isheadid(s))
|
| 671 |
return(0);
|
| 672 |
if (!strncmp(s, "NAME=", 5)) {
|
| 673 |
strcpy(bsdf_name, s+5);
|
| 674 |
bsdf_name[strlen(bsdf_name)-1] = '\0';
|
| 675 |
return(1);
|
| 676 |
}
|
| 677 |
if (!strncmp(s, "MANUFACT=", 9)) {
|
| 678 |
strcpy(bsdf_manuf, s+9);
|
| 679 |
bsdf_manuf[strlen(bsdf_manuf)-1] = '\0';
|
| 680 |
return(1);
|
| 681 |
}
|
| 682 |
if (!strncmp(s, "SYMMETRY=", 9)) {
|
| 683 |
inp_coverage = atoi(s+9);
|
| 684 |
single_plane_incident = !inp_coverage;
|
| 685 |
return(1);
|
| 686 |
}
|
| 687 |
if (!strncmp(s, "IO_SIDES=", 9)) {
|
| 688 |
sscanf(s+9, "%d %d", &input_orient, &output_orient);
|
| 689 |
return(1);
|
| 690 |
}
|
| 691 |
if (!strncmp(s, "COLORIMETRY=", 12)) {
|
| 692 |
fmt[0] = '\0';
|
| 693 |
sscanf(s+12, "%s", fmt);
|
| 694 |
for (i = RBCunknown; i >= 0; i--)
|
| 695 |
if (!strcmp(fmt, RBCident[i]))
|
| 696 |
break;
|
| 697 |
if (i < 0)
|
| 698 |
return(-1);
|
| 699 |
rbf_colorimetry = i;
|
| 700 |
return(1);
|
| 701 |
}
|
| 702 |
if (!strncmp(s, "GRIDRES=", 8)) {
|
| 703 |
sscanf(s+8, "%d", &grid_res);
|
| 704 |
return(1);
|
| 705 |
}
|
| 706 |
if (!strncmp(s, "BSDFMIN=", 8)) {
|
| 707 |
sscanf(s+8, "%lf", &bsdf_min);
|
| 708 |
return(1);
|
| 709 |
}
|
| 710 |
if (!strncmp(s, "BSDFSPEC=", 9)) {
|
| 711 |
sscanf(s+9, "%lf %lf", &bsdf_spec_val, &bsdf_spec_rad);
|
| 712 |
return(1);
|
| 713 |
}
|
| 714 |
if (formatval(fmt, s))
|
| 715 |
return (strcmp(fmt, BSDFREP_FMT) ? -1 : 0);
|
| 716 |
if (sir_headshare != NULL)
|
| 717 |
return ((*sir_headshare)(s));
|
| 718 |
return(0);
|
| 719 |
}
|
| 720 |
|
| 721 |
/* Read a BSDF mesh interpolant from the given binary stream */
|
| 722 |
int
|
| 723 |
load_bsdf_rep(FILE *ifp)
|
| 724 |
{
|
| 725 |
RBFNODE rbfh;
|
| 726 |
int from_ord, to_ord;
|
| 727 |
int i;
|
| 728 |
|
| 729 |
clear_bsdf_rep();
|
| 730 |
if (ifp == NULL)
|
| 731 |
return(0);
|
| 732 |
if (getheader(ifp, headline, NULL) < 0 || (single_plane_incident < 0) |
|
| 733 |
!input_orient | !output_orient |
|
| 734 |
(grid_res < 16) | (grid_res > 0xffff)) {
|
| 735 |
fprintf(stderr, "%s: missing/bad format for BSDF interpolant\n",
|
| 736 |
progname);
|
| 737 |
return(0);
|
| 738 |
}
|
| 739 |
if (getint(2, ifp) != BSDFREP_MAGIC) {
|
| 740 |
fprintf(stderr, "%s: bad magic number for BSDF interpolant\n",
|
| 741 |
progname);
|
| 742 |
return(0);
|
| 743 |
}
|
| 744 |
memset(&rbfh, 0, sizeof(rbfh)); /* read each DSF */
|
| 745 |
while ((rbfh.ord = getint(4, ifp)) >= 0) {
|
| 746 |
RBFNODE *newrbf;
|
| 747 |
|
| 748 |
rbfh.invec[0] = getflt(ifp);
|
| 749 |
rbfh.invec[1] = getflt(ifp);
|
| 750 |
rbfh.invec[2] = getflt(ifp);
|
| 751 |
if (normalize(rbfh.invec) == 0) {
|
| 752 |
fprintf(stderr, "%s: zero incident vector\n", progname);
|
| 753 |
return(0);
|
| 754 |
}
|
| 755 |
rbfh.vtotal = getflt(ifp);
|
| 756 |
rbfh.nrbf = getint(4, ifp);
|
| 757 |
newrbf = (RBFNODE *)malloc(sizeof(RBFNODE) +
|
| 758 |
sizeof(RBFVAL)*(rbfh.nrbf-1));
|
| 759 |
if (newrbf == NULL)
|
| 760 |
goto memerr;
|
| 761 |
*newrbf = rbfh;
|
| 762 |
for (i = 0; i < rbfh.nrbf; i++) {
|
| 763 |
newrbf->rbfa[i].peak = getflt(ifp);
|
| 764 |
newrbf->rbfa[i].chroma = getint(2, ifp) & 0xffff;
|
| 765 |
newrbf->rbfa[i].crad = getint(2, ifp) & 0xffff;
|
| 766 |
newrbf->rbfa[i].gx = getint(2, ifp) & 0xffff;
|
| 767 |
newrbf->rbfa[i].gy = getint(2, ifp) & 0xffff;
|
| 768 |
}
|
| 769 |
if (feof(ifp))
|
| 770 |
goto badEOF;
|
| 771 |
/* insert in global list */
|
| 772 |
if (insert_dsf(newrbf) != rbfh.ord) {
|
| 773 |
fprintf(stderr, "%s: error adding DSF\n", progname);
|
| 774 |
return(0);
|
| 775 |
}
|
| 776 |
}
|
| 777 |
/* read each migration matrix */
|
| 778 |
while ((from_ord = getint(4, ifp)) >= 0 &&
|
| 779 |
(to_ord = getint(4, ifp)) >= 0) {
|
| 780 |
RBFNODE *from_rbf = get_dsf(from_ord);
|
| 781 |
RBFNODE *to_rbf = get_dsf(to_ord);
|
| 782 |
MIGRATION *newmig;
|
| 783 |
int n;
|
| 784 |
|
| 785 |
if ((from_rbf == NULL) | (to_rbf == NULL)) {
|
| 786 |
fprintf(stderr,
|
| 787 |
"%s: bad DSF reference in migration edge\n",
|
| 788 |
progname);
|
| 789 |
return(0);
|
| 790 |
}
|
| 791 |
n = from_rbf->nrbf * to_rbf->nrbf;
|
| 792 |
newmig = (MIGRATION *)malloc(sizeof(MIGRATION) +
|
| 793 |
sizeof(float)*(n-1));
|
| 794 |
if (newmig == NULL)
|
| 795 |
goto memerr;
|
| 796 |
newmig->rbfv[0] = from_rbf;
|
| 797 |
newmig->rbfv[1] = to_rbf;
|
| 798 |
memset(newmig->mtx, 0, sizeof(float)*n);
|
| 799 |
for (i = 0; ; ) { /* read sparse data */
|
| 800 |
int zc = getint(1, ifp) & 0xff;
|
| 801 |
if ((i += zc) >= n)
|
| 802 |
break;
|
| 803 |
if (zc == 0xff)
|
| 804 |
continue;
|
| 805 |
newmig->mtx[i++] = getflt(ifp);
|
| 806 |
}
|
| 807 |
if (feof(ifp))
|
| 808 |
goto badEOF;
|
| 809 |
/* insert in edge lists */
|
| 810 |
newmig->enxt[0] = from_rbf->ejl;
|
| 811 |
from_rbf->ejl = newmig;
|
| 812 |
newmig->enxt[1] = to_rbf->ejl;
|
| 813 |
to_rbf->ejl = newmig;
|
| 814 |
/* push onto global list */
|
| 815 |
newmig->next = mig_list;
|
| 816 |
mig_list = newmig;
|
| 817 |
}
|
| 818 |
return(1); /* success! */
|
| 819 |
memerr:
|
| 820 |
fprintf(stderr, "%s: Out of memory in load_bsdf_rep()\n", progname);
|
| 821 |
exit(1);
|
| 822 |
badEOF:
|
| 823 |
fprintf(stderr, "%s: Unexpected EOF in load_bsdf_rep()\n", progname);
|
| 824 |
return(0);
|
| 825 |
}
|
