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#ifndef lint |
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static const char RCSid[] = "$Id$"; |
3 |
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#endif |
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/* |
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* bsdf_t.c |
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* |
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* |
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*/ |
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|
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#include <stdio.h> |
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#include "rtio.h" |
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#include <stdlib.h> |
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#include <math.h> |
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#include <ctype.h> |
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#include "ezxml.h" |
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#include "bsdf.h" |
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#include "bsdf_t.h" |
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#include "hilbert.h" |
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|
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/* Callback function type for SDtraverseTre() */ |
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typedef int SDtreCallback(float val, const double *cmin, |
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double csiz, void *cptr); |
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|
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/* reference width maximum (1.0) */ |
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static const unsigned iwbits = sizeof(unsigned)*4; |
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static const unsigned iwmax = (1<<(sizeof(unsigned)*4))-1; |
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/* maximum cumulative value */ |
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static const unsigned cumlmax = ~0; |
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|
32 |
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/* Struct used for our distribution-building callback */ |
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typedef struct { |
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int nic; /* number of input coordinates */ |
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unsigned alen; /* current array length */ |
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unsigned nall; /* number of allocated entries */ |
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unsigned wmin; /* minimum square size so far */ |
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unsigned wmax; /* maximum square size */ |
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struct outdir_s { |
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unsigned hent; /* entering Hilbert index */ |
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int wid; /* this square size */ |
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float bsdf; /* BSDF for this square */ |
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} *darr; /* output direction array */ |
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} SDdistScaffold; |
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|
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/* Allocate a new scattering distribution node */ |
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static SDNode * |
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SDnewNode(int nd, int lg) |
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} |
61 |
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if (lg < 0) { |
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st = (SDNode *)malloc(sizeof(SDNode) + |
63 |
< |
((1<<nd) - 1)*sizeof(st->u.t[0])); |
63 |
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sizeof(st->u.t[0])*((1<<nd) - 1)); |
64 |
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if (st != NULL) |
65 |
< |
memset(st->u.t, 0, (1<<nd)*sizeof(st->u.t[0])); |
65 |
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memset(st->u.t, 0, sizeof(st->u.t[0])<<nd); |
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} else |
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st = (SDNode *)malloc(sizeof(SDNode) + |
68 |
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((1 << nd*lg) - 1)*sizeof(st->u.v[0])); |
68 |
> |
sizeof(st->u.v[0])*((1 << nd*lg) - 1)); |
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|
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if (st == NULL) { |
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if (lg < 0) |
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sprintf(SDerrorDetail, |
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"Cannot allocate %d branch BSDF tree", nd); |
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"Cannot allocate %d branch BSDF tree", 1<<nd); |
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else |
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sprintf(SDerrorDetail, |
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"Cannot allocate %d BSDF leaves", 1 << nd*lg); |
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|
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/* Free an SD tree */ |
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static void |
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SDfreeTree(void *p) |
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SDfreeTre(SDNode *st) |
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{ |
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SDNode *st = (SDNode *)p; |
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int i; |
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|
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if (st == NULL) |
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return; |
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for (i = (st->log2GR < 0) << st->ndim; i--; ) |
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< |
SDfreeTree(st->u.t[i]); |
93 |
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SDfreeTre(st->u.t[i]); |
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free((void *)st); |
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} |
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|
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/* Free a variable-resolution BSDF */ |
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static void |
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SDFreeBTre(void *p) |
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{ |
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SDTre *sdt = (SDTre *)p; |
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|
103 |
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if (sdt == NULL) |
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return; |
105 |
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SDfreeTre(sdt->st); |
106 |
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free(sdt); |
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} |
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|
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/* Fill branch's worth of grid values from subtree */ |
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static void |
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fill_grid_branch(float *dptr, const float *sptr, int nd, int shft) |
112 |
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{ |
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unsigned n = 1 << (shft-1); |
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|
115 |
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if (!--nd) { /* end on the line */ |
116 |
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memcpy(dptr, sptr, sizeof(*dptr)*n); |
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return; |
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} |
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while (n--) /* recurse on each slice */ |
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fill_grid_branch(dptr + (n << shft*nd), |
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sptr + (n << (shft-1)*nd), nd, shft); |
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} |
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|
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/* Get pointer at appropriate offset for the given branch */ |
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static float * |
126 |
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grid_branch_start(SDNode *st, int n) |
127 |
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{ |
128 |
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unsigned skipsiz = 1 << st->log2GR; |
129 |
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float *vptr = st->u.v; |
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int i; |
131 |
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|
132 |
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for (i = 0; i < st->ndim; skipsiz <<= st->log2GR) |
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if (1<<i++ & n) |
134 |
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vptr += skipsiz >> 1; |
135 |
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return vptr; |
136 |
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} |
137 |
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|
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/* Simplify (consolidate) a tree by flattening uniform depth regions */ |
139 |
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static SDNode * |
140 |
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SDsimplifyTre(SDNode *st) |
141 |
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{ |
142 |
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int match, n; |
143 |
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|
144 |
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if (st == NULL) /* check for invalid tree */ |
145 |
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return NULL; |
146 |
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if (st->log2GR >= 0) /* grid just returns unaltered */ |
147 |
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return st; |
148 |
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match = 1; /* check if grids below match */ |
149 |
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for (n = 0; n < 1<<st->ndim; n++) { |
150 |
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if ((st->u.t[n] = SDsimplifyTre(st->u.t[n])) == NULL) |
151 |
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return NULL; /* propogate error up call stack */ |
152 |
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match &= (st->u.t[n]->log2GR == st->u.t[0]->log2GR); |
153 |
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} |
154 |
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if (match && (match = st->u.t[0]->log2GR) >= 0) { |
155 |
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SDNode *stn = SDnewNode(st->ndim, match + 1); |
156 |
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if (stn == NULL) /* out of memory? */ |
157 |
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return st; |
158 |
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/* transfer values to new grid */ |
159 |
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for (n = 1 << st->ndim; n--; ) |
160 |
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fill_grid_branch(grid_branch_start(stn, n), |
161 |
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st->u.t[n]->u.v, stn->ndim, stn->log2GR); |
162 |
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SDfreeTre(st); /* free old tree */ |
163 |
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st = stn; /* return new one */ |
164 |
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} |
165 |
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return st; |
166 |
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} |
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|
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/* Find smallest leaf in tree */ |
169 |
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static double |
170 |
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SDsmallestLeaf(const SDNode *st) |
171 |
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{ |
172 |
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if (st->log2GR < 0) { /* tree branches */ |
173 |
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double lmin = 1.; |
174 |
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int n; |
175 |
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for (n = 1<<st->ndim; n--; ) { |
176 |
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double lsiz = SDsmallestLeaf(st->u.t[n]); |
177 |
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if (lsiz < lmin) |
178 |
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lmin = lsiz; |
179 |
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} |
180 |
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return .5*lmin; |
181 |
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} |
182 |
+ |
/* leaf grid width */ |
183 |
+ |
return 1. / (double)(1 << st->log2GR); |
184 |
+ |
} |
185 |
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|
186 |
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/* Add up N-dimensional hypercube array values over the given box */ |
187 |
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static double |
188 |
< |
SDiterSum(const float *va, int nd, int siz, const int *imin, const int *imax) |
188 |
> |
SDiterSum(const float *va, int nd, int shft, const int *imin, const int *imax) |
189 |
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{ |
190 |
+ |
const unsigned skipsiz = 1 << --nd*shft; |
191 |
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double sum = .0; |
73 |
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unsigned skipsiz = 1; |
192 |
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int i; |
193 |
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|
76 |
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for (i = nd; --i > 0; ) |
77 |
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skipsiz *= siz; |
194 |
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if (skipsiz == 1) |
195 |
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for (i = *imin; i < *imax; i++) |
196 |
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sum += va[i]; |
197 |
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else |
198 |
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for (i = *imin; i < *imax; i++) |
199 |
< |
sum += SDiterSum(va + i*skipsiz, |
84 |
< |
nd-1, siz, imin+1, imax+1); |
199 |
> |
sum += SDiterSum(va + i*skipsiz, nd, shft, imin+1, imax+1); |
200 |
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return sum; |
201 |
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} |
202 |
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|
203 |
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/* Average BSDF leaves over an orthotope defined by the unit hypercube */ |
204 |
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static double |
205 |
< |
SDavgBox(const SDNode *st, const double *bmin, const double *bmax) |
205 |
> |
SDavgTreBox(const SDNode *st, const double *bmin, const double *bmax) |
206 |
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{ |
207 |
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int imin[SD_MAXDIM], imax[SD_MAXDIM]; |
208 |
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unsigned n; |
237 |
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w *= sbmax[i] - sbmin[i]; |
238 |
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} |
239 |
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if (w > 1e-10) { |
240 |
< |
sum += w * SDavgBox(st->u.t[n], sbmin, sbmax); |
240 |
> |
sum += w * SDavgTreBox(st->u.t[n], sbmin, sbmax); |
241 |
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wsum += w; |
242 |
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} |
243 |
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} |
245 |
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} |
246 |
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n = 1; /* iterate over leaves */ |
247 |
|
for (i = st->ndim; i--; ) { |
248 |
< |
imin[i] = (bmin[i] <= .0) ? 0 |
248 |
> |
imin[i] = (bmin[i] <= 0) ? 0 |
249 |
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: (int)((1 << st->log2GR)*bmin[i]); |
250 |
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imax[i] = (bmax[i] >= 1.) ? (1 << st->log2GR) |
251 |
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: (int)((1 << st->log2GR)*bmax[i] + .999999); |
254 |
|
if (!n) |
255 |
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return .0; |
256 |
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|
257 |
< |
return SDiterSum(st->u.v, st->ndim, 1 << st->log2GR, imin, imax) / |
143 |
< |
(double)n; |
257 |
> |
return SDiterSum(st->u.v, st->ndim, st->log2GR, imin, imax) / (double)n; |
258 |
|
} |
259 |
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|
260 |
+ |
/* Recursive call for SDtraverseTre() */ |
261 |
+ |
static int |
262 |
+ |
SDdotravTre(const SDNode *st, const double *pos, int cmask, |
263 |
+ |
SDtreCallback *cf, void *cptr, |
264 |
+ |
const double *cmin, double csiz) |
265 |
+ |
{ |
266 |
+ |
int rv, rval = 0; |
267 |
+ |
double bmin[SD_MAXDIM]; |
268 |
+ |
int i, n; |
269 |
+ |
/* in branches? */ |
270 |
+ |
if (st->log2GR < 0) { |
271 |
+ |
unsigned skipmask = 0; |
272 |
+ |
|
273 |
+ |
csiz *= .5; |
274 |
+ |
for (i = st->ndim; i--; ) |
275 |
+ |
if (1<<i & cmask) |
276 |
+ |
if (pos[i] < cmin[i] + csiz) |
277 |
+ |
for (n = 1 << st->ndim; n--; ) |
278 |
+ |
if (n & 1<<i) |
279 |
+ |
skipmask |= 1<<n; |
280 |
+ |
else |
281 |
+ |
for (n = 1 << st->ndim; n--; ) |
282 |
+ |
if (!(n & 1<<i)) |
283 |
+ |
skipmask |= 1<<n; |
284 |
+ |
for (n = 1 << st->ndim; n--; ) { |
285 |
+ |
if (1<<n & skipmask) |
286 |
+ |
continue; |
287 |
+ |
for (i = st->ndim; i--; ) |
288 |
+ |
if (1<<i & n) |
289 |
+ |
bmin[i] = cmin[i] + csiz; |
290 |
+ |
else |
291 |
+ |
bmin[i] = cmin[i]; |
292 |
+ |
|
293 |
+ |
rval += rv = SDdotravTre(st->u.t[n], pos, cmask, |
294 |
+ |
cf, cptr, bmin, csiz); |
295 |
+ |
if (rv < 0) |
296 |
+ |
return rv; |
297 |
+ |
} |
298 |
+ |
} else { /* else traverse leaves */ |
299 |
+ |
int clim[SD_MAXDIM][2]; |
300 |
+ |
int cpos[SD_MAXDIM]; |
301 |
+ |
|
302 |
+ |
if (st->log2GR == 0) /* short cut */ |
303 |
+ |
return (*cf)(st->u.v[0], cmin, csiz, cptr); |
304 |
+ |
|
305 |
+ |
csiz /= (double)(1 << st->log2GR); |
306 |
+ |
/* assign coord. ranges */ |
307 |
+ |
for (i = st->ndim; i--; ) |
308 |
+ |
if (1<<i & cmask) { |
309 |
+ |
clim[i][0] = (pos[i] - cmin[i])/csiz; |
310 |
+ |
/* check overflow from f.p. error */ |
311 |
+ |
clim[i][0] -= clim[i][0] >> st->log2GR; |
312 |
+ |
clim[i][1] = clim[i][0] + 1; |
313 |
+ |
} else { |
314 |
+ |
clim[i][0] = 0; |
315 |
+ |
clim[i][1] = 1 << st->log2GR; |
316 |
+ |
} |
317 |
+ |
/* fill in unused dimensions */ |
318 |
+ |
for (i = SD_MAXDIM; i-- > st->ndim; ) { |
319 |
+ |
clim[i][0] = 0; clim[i][1] = 1; |
320 |
+ |
} |
321 |
+ |
#if (SD_MAXDIM == 4) |
322 |
+ |
bmin[0] = cmin[0] + csiz*clim[0][0]; |
323 |
+ |
for (cpos[0] = clim[0][0]; cpos[0] < clim[0][1]; cpos[0]++) { |
324 |
+ |
bmin[1] = cmin[1] + csiz*clim[1][0]; |
325 |
+ |
for (cpos[1] = clim[1][0]; cpos[1] < clim[1][1]; cpos[1]++) { |
326 |
+ |
bmin[2] = cmin[2] + csiz*clim[2][0]; |
327 |
+ |
for (cpos[2] = clim[2][0]; cpos[2] < clim[2][1]; cpos[2]++) { |
328 |
+ |
bmin[3] = cmin[3] + csiz*(cpos[3] = clim[3][0]); |
329 |
+ |
n = cpos[0]; |
330 |
+ |
for (i = 1; i < st->ndim; i++) |
331 |
+ |
n = (n << st->log2GR) + cpos[i]; |
332 |
+ |
for ( ; cpos[3] < clim[3][1]; cpos[3]++) { |
333 |
+ |
rval += rv = (*cf)(st->u.v[n++], bmin, csiz, cptr); |
334 |
+ |
if (rv < 0) |
335 |
+ |
return rv; |
336 |
+ |
bmin[3] += csiz; |
337 |
+ |
} |
338 |
+ |
bmin[2] += csiz; |
339 |
+ |
} |
340 |
+ |
bmin[1] += csiz; |
341 |
+ |
} |
342 |
+ |
bmin[0] += csiz; |
343 |
+ |
} |
344 |
+ |
#else |
345 |
+ |
_!_ "broken code segment!" |
346 |
+ |
#endif |
347 |
+ |
} |
348 |
+ |
return rval; |
349 |
+ |
} |
350 |
+ |
|
351 |
+ |
/* Traverse a tree, visiting nodes in a slice that fits partial position */ |
352 |
+ |
static int |
353 |
+ |
SDtraverseTre(const SDNode *st, const double *pos, int cmask, |
354 |
+ |
SDtreCallback *cf, void *cptr) |
355 |
+ |
{ |
356 |
+ |
static double czero[SD_MAXDIM]; |
357 |
+ |
int i; |
358 |
+ |
/* check arguments */ |
359 |
+ |
if ((st == NULL) | (cf == NULL)) |
360 |
+ |
return -1; |
361 |
+ |
for (i = st->ndim; i--; ) |
362 |
+ |
if (1<<i & cmask && (pos[i] < 0) | (pos[i] >= 1.)) |
363 |
+ |
return -1; |
364 |
+ |
|
365 |
+ |
return SDdotravTre(st, pos, cmask, cf, cptr, czero, 1.); |
366 |
+ |
} |
367 |
+ |
|
368 |
+ |
/* Look up tree value at the given grid position */ |
369 |
+ |
static float |
370 |
+ |
SDlookupTre(const SDNode *st, const double *pos, double *hcube) |
371 |
+ |
{ |
372 |
+ |
double spos[SD_MAXDIM]; |
373 |
+ |
int i, n, t; |
374 |
+ |
/* initialize voxel return */ |
375 |
+ |
if (hcube) { |
376 |
+ |
hcube[i = st->ndim] = 1.; |
377 |
+ |
while (i--) |
378 |
+ |
hcube[i] = .0; |
379 |
+ |
} |
380 |
+ |
/* climb the tree */ |
381 |
+ |
while (st->log2GR < 0) { |
382 |
+ |
n = 0; /* move to appropriate branch */ |
383 |
+ |
if (hcube) hcube[st->ndim] *= .5; |
384 |
+ |
for (i = st->ndim; i--; ) { |
385 |
+ |
spos[i] = 2.*pos[i]; |
386 |
+ |
t = (spos[i] >= 1.); |
387 |
+ |
n |= t<<i; |
388 |
+ |
spos[i] -= (double)t; |
389 |
+ |
if (hcube) hcube[i] += (double)t * hcube[st->ndim]; |
390 |
+ |
} |
391 |
+ |
st = st->u.t[n]; /* avoids tail recursion */ |
392 |
+ |
pos = spos; |
393 |
+ |
} |
394 |
+ |
if (st->log2GR == 0) /* short cut */ |
395 |
+ |
return st->u.v[0]; |
396 |
+ |
n = t = 0; /* find grid array index */ |
397 |
+ |
for (i = st->ndim; i--; ) { |
398 |
+ |
n += (int)((1<<st->log2GR)*pos[i]) << t; |
399 |
+ |
t += st->log2GR; |
400 |
+ |
} |
401 |
+ |
if (hcube) { /* compute final hypercube */ |
402 |
+ |
hcube[st->ndim] /= (double)(1<<st->log2GR); |
403 |
+ |
for (i = st->ndim; i--; ) |
404 |
+ |
hcube[i] += floor((1<<st->log2GR)*pos[i])*hcube[st->ndim]; |
405 |
+ |
} |
406 |
+ |
return st->u.v[n]; /* no interpolation */ |
407 |
+ |
} |
408 |
+ |
|
409 |
+ |
/* Query BSDF value and sample hypercube for the given vectors */ |
410 |
+ |
static float |
411 |
+ |
SDqueryTre(const SDTre *sdt, const FVECT outVec, const FVECT inVec, double *hc) |
412 |
+ |
{ |
413 |
+ |
static const FVECT zvec = {.0, .0, 1.}; |
414 |
+ |
FVECT rOutVec; |
415 |
+ |
double gridPos[4]; |
416 |
+ |
|
417 |
+ |
switch (sdt->sidef) { /* whose side are you on? */ |
418 |
+ |
case SD_UFRONT: |
419 |
+ |
if ((outVec[2] < 0) | (inVec[2] < 0)) |
420 |
+ |
return -1.; |
421 |
+ |
break; |
422 |
+ |
case SD_UBACK: |
423 |
+ |
if ((outVec[2] > 0) | (inVec[2] > 0)) |
424 |
+ |
return -1.; |
425 |
+ |
break; |
426 |
+ |
case SD_XMIT: |
427 |
+ |
if ((outVec[2] > 0) == (inVec[2] > 0)) |
428 |
+ |
return -1.; |
429 |
+ |
break; |
430 |
+ |
default: |
431 |
+ |
return -1.; |
432 |
+ |
} |
433 |
+ |
/* convert vector coordinates */ |
434 |
+ |
if (sdt->st->ndim == 3) { |
435 |
+ |
spinvector(rOutVec, outVec, zvec, -atan2(inVec[1],inVec[0])); |
436 |
+ |
gridPos[0] = .5 - .5*sqrt(inVec[0]*inVec[0] + inVec[1]*inVec[1]); |
437 |
+ |
SDdisk2square(gridPos+1, rOutVec[0], rOutVec[1]); |
438 |
+ |
} else if (sdt->st->ndim == 4) { |
439 |
+ |
SDdisk2square(gridPos, -inVec[0], -inVec[1]); |
440 |
+ |
SDdisk2square(gridPos+2, outVec[0], outVec[1]); |
441 |
+ |
} else |
442 |
+ |
return -1.; /* should be internal error */ |
443 |
+ |
|
444 |
+ |
return SDlookupTre(sdt->st, gridPos, hc); |
445 |
+ |
} |
446 |
+ |
|
447 |
+ |
/* Compute non-diffuse component for variable-resolution BSDF */ |
448 |
+ |
static int |
449 |
+ |
SDgetTreBSDF(float coef[SDmaxCh], const FVECT outVec, |
450 |
+ |
const FVECT inVec, SDComponent *sdc) |
451 |
+ |
{ |
452 |
+ |
/* check arguments */ |
453 |
+ |
if ((coef == NULL) | (outVec == NULL) | (inVec == NULL) | (sdc == NULL) |
454 |
+ |
|| sdc->dist == NULL) |
455 |
+ |
return 0; |
456 |
+ |
/* get nearest BSDF value */ |
457 |
+ |
coef[0] = SDqueryTre((SDTre *)sdc->dist, outVec, inVec, NULL); |
458 |
+ |
return (coef[0] >= 0); /* monochromatic for now */ |
459 |
+ |
} |
460 |
+ |
|
461 |
+ |
/* Callback to build cumulative distribution using SDtraverseTre() */ |
462 |
+ |
static int |
463 |
+ |
build_scaffold(float val, const double *cmin, double csiz, void *cptr) |
464 |
+ |
{ |
465 |
+ |
SDdistScaffold *sp = (SDdistScaffold *)cptr; |
466 |
+ |
int wid = csiz*(double)iwmax + .5; |
467 |
+ |
bitmask_t bmin[2], bmax[2]; |
468 |
+ |
|
469 |
+ |
cmin += sp->nic; /* skip to output coords */ |
470 |
+ |
if (wid < sp->wmin) /* new minimum width? */ |
471 |
+ |
sp->wmin = wid; |
472 |
+ |
if (wid > sp->wmax) /* new maximum? */ |
473 |
+ |
sp->wmax = wid; |
474 |
+ |
if (sp->alen >= sp->nall) { /* need more space? */ |
475 |
+ |
struct outdir_s *ndarr; |
476 |
+ |
sp->nall += 8192; |
477 |
+ |
ndarr = (struct outdir_s *)realloc(sp->darr, |
478 |
+ |
sizeof(struct outdir_s)*sp->nall); |
479 |
+ |
if (ndarr == NULL) |
480 |
+ |
return -1; /* abort build */ |
481 |
+ |
sp->darr = ndarr; |
482 |
+ |
} |
483 |
+ |
/* find Hilbert entry index */ |
484 |
+ |
bmin[0] = cmin[0]*(double)iwmax + .5; |
485 |
+ |
bmin[1] = cmin[1]*(double)iwmax + .5; |
486 |
+ |
bmax[0] = bmin[0] + wid-1; |
487 |
+ |
bmax[1] = bmin[1] + wid-1; |
488 |
+ |
hilbert_box_vtx(2, sizeof(bitmask_t), iwbits, 1, bmin, bmax); |
489 |
+ |
sp->darr[sp->alen].hent = hilbert_c2i(2, iwbits, bmin); |
490 |
+ |
sp->darr[sp->alen].wid = wid; |
491 |
+ |
sp->darr[sp->alen].bsdf = val; |
492 |
+ |
sp->alen++; /* on to the next entry */ |
493 |
+ |
return 0; |
494 |
+ |
} |
495 |
+ |
|
496 |
+ |
/* Scaffold comparison function for qsort -- ascending Hilbert index */ |
497 |
+ |
static int |
498 |
+ |
sscmp(const void *p1, const void *p2) |
499 |
+ |
{ |
500 |
+ |
unsigned h1 = (*(const struct outdir_s *)p1).hent; |
501 |
+ |
unsigned h2 = (*(const struct outdir_s *)p2).hent; |
502 |
+ |
|
503 |
+ |
if (h1 > h2) |
504 |
+ |
return 1; |
505 |
+ |
if (h1 < h2) |
506 |
+ |
return -1; |
507 |
+ |
return 0; |
508 |
+ |
/* |
509 |
+ |
return (int)((*(const struct outdir_s *)p1).hent - |
510 |
+ |
(*(const struct outdir_s *)p2).hent); |
511 |
+ |
*/ |
512 |
+ |
} |
513 |
+ |
|
514 |
+ |
/* Create a new cumulative distribution for the given input direction */ |
515 |
+ |
static SDTreCDst * |
516 |
+ |
make_cdist(const SDTre *sdt, const double *pos) |
517 |
+ |
{ |
518 |
+ |
SDdistScaffold myScaffold; |
519 |
+ |
SDTreCDst *cd; |
520 |
+ |
struct outdir_s *sp; |
521 |
+ |
double scale, cursum; |
522 |
+ |
int i; |
523 |
+ |
/* initialize scaffold */ |
524 |
+ |
myScaffold.wmin = iwmax; |
525 |
+ |
myScaffold.wmax = 0; |
526 |
+ |
myScaffold.nic = sdt->st->ndim - 2; |
527 |
+ |
myScaffold.alen = 0; |
528 |
+ |
myScaffold.nall = 8192; |
529 |
+ |
myScaffold.darr = (struct outdir_s *)malloc(sizeof(struct outdir_s) * |
530 |
+ |
myScaffold.nall); |
531 |
+ |
if (myScaffold.darr == NULL) |
532 |
+ |
return NULL; |
533 |
+ |
/* grow the distribution */ |
534 |
+ |
if (SDtraverseTre(sdt->st, pos, (1<<myScaffold.nic)-1, |
535 |
+ |
&build_scaffold, &myScaffold) < 0) { |
536 |
+ |
free(myScaffold.darr); |
537 |
+ |
return NULL; |
538 |
+ |
} |
539 |
+ |
/* allocate result holder */ |
540 |
+ |
cd = (SDTreCDst *)malloc(sizeof(SDTreCDst) + |
541 |
+ |
sizeof(cd->carr[0])*myScaffold.alen); |
542 |
+ |
if (cd == NULL) { |
543 |
+ |
free(myScaffold.darr); |
544 |
+ |
return NULL; |
545 |
+ |
} |
546 |
+ |
/* sort the distribution */ |
547 |
+ |
qsort(myScaffold.darr, cd->calen = myScaffold.alen, |
548 |
+ |
sizeof(struct outdir_s), &sscmp); |
549 |
+ |
|
550 |
+ |
/* record input range */ |
551 |
+ |
scale = myScaffold.wmin / (double)iwmax; |
552 |
+ |
for (i = myScaffold.nic; i--; ) { |
553 |
+ |
cd->clim[i][0] = floor(pos[i]/scale) * scale; |
554 |
+ |
cd->clim[i][1] = cd->clim[i][0] + scale; |
555 |
+ |
} |
556 |
+ |
cd->max_psa = myScaffold.wmax / (double)iwmax; |
557 |
+ |
cd->max_psa *= cd->max_psa * M_PI; |
558 |
+ |
cd->sidef = sdt->sidef; |
559 |
+ |
cd->cTotal = 1e-20; /* compute directional total */ |
560 |
+ |
sp = myScaffold.darr; |
561 |
+ |
for (i = myScaffold.alen; i--; sp++) |
562 |
+ |
cd->cTotal += sp->bsdf * (double)sp->wid * sp->wid; |
563 |
+ |
cursum = .0; /* go back and get cumulative values */ |
564 |
+ |
scale = (double)cumlmax / cd->cTotal; |
565 |
+ |
sp = myScaffold.darr; |
566 |
+ |
for (i = 0; i < cd->calen; i++, sp++) { |
567 |
+ |
cd->carr[i].hndx = sp->hent; |
568 |
+ |
cd->carr[i].cuml = scale*cursum + .5; |
569 |
+ |
cursum += sp->bsdf * (double)sp->wid * sp->wid; |
570 |
+ |
} |
571 |
+ |
cd->carr[i].hndx = ~0; /* make final entry */ |
572 |
+ |
cd->carr[i].cuml = cumlmax; |
573 |
+ |
cd->cTotal *= M_PI/(double)iwmax/iwmax; |
574 |
+ |
/* all done, clean up and return */ |
575 |
+ |
free(myScaffold.darr); |
576 |
+ |
return cd; |
577 |
+ |
} |
578 |
+ |
|
579 |
+ |
/* Find or allocate a cumulative distribution for the given incoming vector */ |
580 |
+ |
const SDCDst * |
581 |
+ |
SDgetTreCDist(const FVECT inVec, SDComponent *sdc) |
582 |
+ |
{ |
583 |
+ |
const SDTre *sdt; |
584 |
+ |
double inCoord[2]; |
585 |
+ |
int vflags; |
586 |
+ |
int i; |
587 |
+ |
SDTreCDst *cd, *cdlast; |
588 |
+ |
/* check arguments */ |
589 |
+ |
if ((inVec == NULL) | (sdc == NULL) || |
590 |
+ |
(sdt = (SDTre *)sdc->dist) == NULL) |
591 |
+ |
return NULL; |
592 |
+ |
if (sdt->st->ndim == 3) /* isotropic BSDF? */ |
593 |
+ |
inCoord[0] = .5 - .5*sqrt(inVec[0]*inVec[0] + inVec[1]*inVec[1]); |
594 |
+ |
else if (sdt->st->ndim == 4) |
595 |
+ |
SDdisk2square(inCoord, -inVec[0], -inVec[1]); |
596 |
+ |
else |
597 |
+ |
return NULL; /* should be internal error */ |
598 |
+ |
cdlast = NULL; /* check for direction in cache list */ |
599 |
+ |
for (cd = (SDTreCDst *)sdc->cdList; cd != NULL; |
600 |
+ |
cdlast = cd, cd = (SDTreCDst *)cd->next) { |
601 |
+ |
for (i = sdt->st->ndim - 2; i--; ) |
602 |
+ |
if ((cd->clim[i][0] > inCoord[i]) | |
603 |
+ |
(inCoord[i] >= cd->clim[i][1])) |
604 |
+ |
break; |
605 |
+ |
if (i < 0) |
606 |
+ |
break; /* means we have a match */ |
607 |
+ |
} |
608 |
+ |
if (cd == NULL) /* need to create new entry? */ |
609 |
+ |
cdlast = cd = make_cdist(sdt, inCoord); |
610 |
+ |
if (cdlast != NULL) { /* move entry to head of cache list */ |
611 |
+ |
cdlast->next = cd->next; |
612 |
+ |
cd->next = sdc->cdList; |
613 |
+ |
sdc->cdList = (SDCDst *)cd; |
614 |
+ |
} |
615 |
+ |
return (SDCDst *)cd; /* ready to go */ |
616 |
+ |
} |
617 |
+ |
|
618 |
+ |
/* Query solid angle for vector(s) */ |
619 |
+ |
static SDError |
620 |
+ |
SDqueryTreProjSA(double *psa, const FVECT v1, const RREAL *v2, |
621 |
+ |
int qflags, SDComponent *sdc) |
622 |
+ |
{ |
623 |
+ |
double myPSA[2]; |
624 |
+ |
/* check arguments */ |
625 |
+ |
if ((psa == NULL) | (v1 == NULL) | (sdc == NULL) || |
626 |
+ |
sdc->dist == NULL) |
627 |
+ |
return SDEargument; |
628 |
+ |
/* get projected solid angle(s) */ |
629 |
+ |
if (v2 != NULL) { |
630 |
+ |
const SDTre *sdt = (SDTre *)sdc->dist; |
631 |
+ |
double hcube[SD_MAXDIM]; |
632 |
+ |
if (SDqueryTre(sdt, v1, v2, hcube) < 0) { |
633 |
+ |
strcpy(SDerrorDetail, "Bad call to SDqueryTreProjSA"); |
634 |
+ |
return SDEinternal; |
635 |
+ |
} |
636 |
+ |
myPSA[0] = hcube[sdt->st->ndim]; |
637 |
+ |
myPSA[1] = myPSA[0] *= myPSA[0] * M_PI; |
638 |
+ |
} else { |
639 |
+ |
const SDTreCDst *cd = (const SDTreCDst *)SDgetTreCDist(v1, sdc); |
640 |
+ |
if (cd == NULL) |
641 |
+ |
return SDEmemory; |
642 |
+ |
myPSA[0] = M_PI * (cd->clim[0][1] - cd->clim[0][0]) * |
643 |
+ |
(cd->clim[1][1] - cd->clim[1][0]); |
644 |
+ |
myPSA[1] = cd->max_psa; |
645 |
+ |
} |
646 |
+ |
switch (qflags) { /* record based on flag settings */ |
647 |
+ |
case SDqueryVal: |
648 |
+ |
*psa = myPSA[0]; |
649 |
+ |
break; |
650 |
+ |
case SDqueryMax: |
651 |
+ |
if (myPSA[1] > *psa) |
652 |
+ |
*psa = myPSA[1]; |
653 |
+ |
break; |
654 |
+ |
case SDqueryMin+SDqueryMax: |
655 |
+ |
if (myPSA[1] > psa[1]) |
656 |
+ |
psa[1] = myPSA[1]; |
657 |
+ |
/* fall through */ |
658 |
+ |
case SDqueryMin: |
659 |
+ |
if (myPSA[0] < psa[0]) |
660 |
+ |
psa[0] = myPSA[0]; |
661 |
+ |
break; |
662 |
+ |
} |
663 |
+ |
return SDEnone; |
664 |
+ |
} |
665 |
+ |
|
666 |
+ |
/* Sample cumulative distribution */ |
667 |
+ |
static SDError |
668 |
+ |
SDsampTreCDist(FVECT ioVec, double randX, const SDCDst *cdp) |
669 |
+ |
{ |
670 |
+ |
const unsigned nBitsC = 4*sizeof(bitmask_t); |
671 |
+ |
const unsigned nExtraBits = 8*(sizeof(bitmask_t)-sizeof(unsigned)); |
672 |
+ |
const SDTreCDst *cd = (const SDTreCDst *)cdp; |
673 |
+ |
const unsigned target = randX*cumlmax; |
674 |
+ |
bitmask_t hndx, hcoord[2]; |
675 |
+ |
double gpos[3]; |
676 |
+ |
int i, iupper, ilower; |
677 |
+ |
/* check arguments */ |
678 |
+ |
if ((ioVec == NULL) | (cd == NULL)) |
679 |
+ |
return SDEargument; |
680 |
+ |
if (ioVec[2] > 0) { |
681 |
+ |
if (!(cd->sidef & SD_UFRONT)) |
682 |
+ |
return SDEargument; |
683 |
+ |
} else if (!(cd->sidef & SD_UBACK)) |
684 |
+ |
return SDEargument; |
685 |
+ |
/* binary search to find position */ |
686 |
+ |
ilower = 0; iupper = cd->calen; |
687 |
+ |
while ((i = (iupper + ilower) >> 1) != ilower) |
688 |
+ |
if ((long)target >= (long)cd->carr[i].cuml) |
689 |
+ |
ilower = i; |
690 |
+ |
else |
691 |
+ |
iupper = i; |
692 |
+ |
/* localize random position */ |
693 |
+ |
randX = (randX*cumlmax - cd->carr[ilower].cuml) / |
694 |
+ |
(double)(cd->carr[iupper].cuml - cd->carr[ilower].cuml); |
695 |
+ |
/* index in longer Hilbert curve */ |
696 |
+ |
hndx = (randX*cd->carr[iupper].hndx + (1.-randX)*cd->carr[ilower].hndx) |
697 |
+ |
* (double)((bitmask_t)1 << nExtraBits); |
698 |
+ |
/* convert Hilbert index to vector */ |
699 |
+ |
hilbert_i2c(2, nBitsC, hndx, hcoord); |
700 |
+ |
for (i = 2; i--; ) |
701 |
+ |
gpos[i] = ((double)hcoord[i] + rand()*(1./(RAND_MAX+.5))) / |
702 |
+ |
(double)((bitmask_t)1 << nBitsC); |
703 |
+ |
SDsquare2disk(gpos, gpos[0], gpos[1]); |
704 |
+ |
/* compute Z-coordinate */ |
705 |
+ |
gpos[2] = 1. - gpos[0]*gpos[0] - gpos[1]*gpos[1]; |
706 |
+ |
if (gpos[2] > 0) /* paranoia, I hope */ |
707 |
+ |
gpos[2] = sqrt(gpos[2]); |
708 |
+ |
/* emit from back? */ |
709 |
+ |
if (ioVec[2] > 0 ^ cd->sidef != SD_XMIT) |
710 |
+ |
gpos[2] = -gpos[2]; |
711 |
+ |
VCOPY(ioVec, gpos); |
712 |
+ |
return SDEnone; |
713 |
+ |
} |
714 |
+ |
|
715 |
+ |
/* Advance pointer to the next non-white character in the string (or nul) */ |
716 |
+ |
static int |
717 |
+ |
next_token(char **spp) |
718 |
+ |
{ |
719 |
+ |
while (isspace(**spp)) |
720 |
+ |
++*spp; |
721 |
+ |
return **spp; |
722 |
+ |
} |
723 |
+ |
|
724 |
+ |
#define eat_token(spp,c) (next_token(spp)==(c) ? *(*(spp))++ : 0) |
725 |
+ |
|
726 |
+ |
/* Count words from this point in string to '}' */ |
727 |
+ |
static int |
728 |
+ |
count_values(char *cp) |
729 |
+ |
{ |
730 |
+ |
int n = 0; |
731 |
+ |
|
732 |
+ |
while (next_token(&cp) != '}' && *cp) { |
733 |
+ |
if (*cp == '{') |
734 |
+ |
return -1; |
735 |
+ |
while (*cp && (*cp != ',') & (*cp != '}') & !isspace(*cp)) |
736 |
+ |
++cp; |
737 |
+ |
++n; |
738 |
+ |
eat_token(&cp, ','); |
739 |
+ |
} |
740 |
+ |
return n; |
741 |
+ |
} |
742 |
+ |
|
743 |
+ |
/* Load an array of real numbers, returning total */ |
744 |
+ |
static int |
745 |
+ |
load_values(char **spp, float *va, int n) |
746 |
+ |
{ |
747 |
+ |
float *v = va; |
748 |
+ |
char *svnext; |
749 |
+ |
|
750 |
+ |
while (n-- > 0 && (svnext = fskip(*spp)) != NULL) { |
751 |
+ |
*v++ = atof(*spp); |
752 |
+ |
*spp = svnext; |
753 |
+ |
eat_token(spp, ','); |
754 |
+ |
} |
755 |
+ |
return v - va; |
756 |
+ |
} |
757 |
+ |
|
758 |
+ |
/* Load BSDF tree data */ |
759 |
+ |
static SDNode * |
760 |
+ |
load_tree_data(char **spp, int nd) |
761 |
+ |
{ |
762 |
+ |
SDNode *st; |
763 |
+ |
int n; |
764 |
+ |
|
765 |
+ |
if (!eat_token(spp, '{')) { |
766 |
+ |
strcpy(SDerrorDetail, "Missing '{' in tensor tree"); |
767 |
+ |
return NULL; |
768 |
+ |
} |
769 |
+ |
if (next_token(spp) == '{') { /* tree branches */ |
770 |
+ |
st = SDnewNode(nd, -1); |
771 |
+ |
if (st == NULL) |
772 |
+ |
return NULL; |
773 |
+ |
for (n = 0; n < 1<<nd; n++) |
774 |
+ |
if ((st->u.t[n] = load_tree_data(spp, nd)) == NULL) { |
775 |
+ |
SDfreeTre(st); |
776 |
+ |
return NULL; |
777 |
+ |
} |
778 |
+ |
} else { /* else load value grid */ |
779 |
+ |
int bsiz; |
780 |
+ |
n = count_values(*spp); /* see how big the grid is */ |
781 |
+ |
if (n <= 0) { |
782 |
+ |
strcpy(SDerrorDetail, "Bad tensor tree data"); |
783 |
+ |
return NULL; |
784 |
+ |
} |
785 |
+ |
for (bsiz = 0; bsiz < 8*sizeof(size_t)-1; bsiz += nd) |
786 |
+ |
if (1<<bsiz == n) |
787 |
+ |
break; |
788 |
+ |
if (bsiz >= 8*sizeof(size_t)) { |
789 |
+ |
strcpy(SDerrorDetail, "Illegal value count in tensor tree"); |
790 |
+ |
return NULL; |
791 |
+ |
} |
792 |
+ |
st = SDnewNode(nd, bsiz/nd); |
793 |
+ |
if (st == NULL) |
794 |
+ |
return NULL; |
795 |
+ |
if (load_values(spp, st->u.v, n) != n) { |
796 |
+ |
strcpy(SDerrorDetail, "Real format error in tensor tree"); |
797 |
+ |
SDfreeTre(st); |
798 |
+ |
return NULL; |
799 |
+ |
} |
800 |
+ |
} |
801 |
+ |
if (!eat_token(spp, '}')) { |
802 |
+ |
strcpy(SDerrorDetail, "Missing '}' in tensor tree"); |
803 |
+ |
SDfreeTre(st); |
804 |
+ |
return NULL; |
805 |
+ |
} |
806 |
+ |
eat_token(spp, ','); |
807 |
+ |
return st; |
808 |
+ |
} |
809 |
+ |
|
810 |
+ |
/* Compute min. proj. solid angle and max. direct hemispherical scattering */ |
811 |
+ |
static SDError |
812 |
+ |
get_extrema(SDSpectralDF *df) |
813 |
+ |
{ |
814 |
+ |
SDNode *st = (*(SDTre *)df->comp[0].dist).st; |
815 |
+ |
double stepWidth, dhemi, bmin[4], bmax[4]; |
816 |
+ |
|
817 |
+ |
stepWidth = SDsmallestLeaf(st); |
818 |
+ |
df->minProjSA = M_PI*stepWidth*stepWidth; |
819 |
+ |
if (stepWidth < .03125) |
820 |
+ |
stepWidth = .03125; /* 1/32 resolution good enough */ |
821 |
+ |
df->maxHemi = .0; |
822 |
+ |
if (st->ndim == 3) { /* isotropic BSDF */ |
823 |
+ |
bmin[1] = bmin[2] = .0; |
824 |
+ |
bmax[1] = bmax[2] = 1.; |
825 |
+ |
for (bmin[0] = .0; bmin[0] < .5-FTINY; bmin[0] += stepWidth) { |
826 |
+ |
bmax[0] = bmin[0] + stepWidth; |
827 |
+ |
dhemi = SDavgTreBox(st, bmin, bmax); |
828 |
+ |
if (dhemi > df->maxHemi) |
829 |
+ |
df->maxHemi = dhemi; |
830 |
+ |
} |
831 |
+ |
} else if (st->ndim == 4) { /* anisotropic BSDF */ |
832 |
+ |
bmin[2] = bmin[3] = .0; |
833 |
+ |
bmax[2] = bmax[3] = 1.; |
834 |
+ |
for (bmin[0] = .0; bmin[0] < 1.-FTINY; bmin[0] += stepWidth) { |
835 |
+ |
bmax[0] = bmin[0] + stepWidth; |
836 |
+ |
for (bmin[1] = .0; bmin[1] < 1.-FTINY; bmin[1] += stepWidth) { |
837 |
+ |
bmax[1] = bmin[1] + stepWidth; |
838 |
+ |
dhemi = SDavgTreBox(st, bmin, bmax); |
839 |
+ |
if (dhemi > df->maxHemi) |
840 |
+ |
df->maxHemi = dhemi; |
841 |
+ |
} |
842 |
+ |
} |
843 |
+ |
} else |
844 |
+ |
return SDEinternal; |
845 |
+ |
/* correct hemispherical value */ |
846 |
+ |
df->maxHemi *= M_PI; |
847 |
+ |
return SDEnone; |
848 |
+ |
} |
849 |
+ |
|
850 |
+ |
/* Load BSDF distribution for this wavelength */ |
851 |
+ |
static SDError |
852 |
+ |
load_bsdf_data(SDData *sd, ezxml_t wdb, int ndim) |
853 |
+ |
{ |
854 |
+ |
SDSpectralDF *df; |
855 |
+ |
SDTre *sdt; |
856 |
+ |
char *sdata; |
857 |
+ |
int i; |
858 |
+ |
/* allocate BSDF component */ |
859 |
+ |
sdata = ezxml_txt(ezxml_child(wdb, "WavelengthDataDirection")); |
860 |
+ |
if (!sdata) |
861 |
+ |
return SDEnone; |
862 |
+ |
/* |
863 |
+ |
* Remember that front and back are reversed from WINDOW 6 orientations |
864 |
+ |
*/ |
865 |
+ |
if (!strcasecmp(sdata, "Transmission")) { |
866 |
+ |
if (sd->tf != NULL) |
867 |
+ |
SDfreeSpectralDF(sd->tf); |
868 |
+ |
if ((sd->tf = SDnewSpectralDF(1)) == NULL) |
869 |
+ |
return SDEmemory; |
870 |
+ |
df = sd->tf; |
871 |
+ |
} else if (!strcasecmp(sdata, "Reflection Front")) { |
872 |
+ |
if (sd->rb != NULL) /* note back-front reversal */ |
873 |
+ |
SDfreeSpectralDF(sd->rb); |
874 |
+ |
if ((sd->rb = SDnewSpectralDF(1)) == NULL) |
875 |
+ |
return SDEmemory; |
876 |
+ |
df = sd->rb; |
877 |
+ |
} else if (!strcasecmp(sdata, "Reflection Back")) { |
878 |
+ |
if (sd->rf != NULL) /* note front-back reversal */ |
879 |
+ |
SDfreeSpectralDF(sd->rf); |
880 |
+ |
if ((sd->rf = SDnewSpectralDF(1)) == NULL) |
881 |
+ |
return SDEmemory; |
882 |
+ |
df = sd->rf; |
883 |
+ |
} else |
884 |
+ |
return SDEnone; |
885 |
+ |
/* XXX should also check "ScatteringDataType" for consistency? */ |
886 |
+ |
/* get angle bases */ |
887 |
+ |
sdata = ezxml_txt(ezxml_child(wdb,"AngleBasis")); |
888 |
+ |
if (!sdata || strcasecmp(sdata, "LBNL/Shirley-Chiu")) { |
889 |
+ |
sprintf(SDerrorDetail, "%s angle basis for BSDF '%s'", |
890 |
+ |
!sdata ? "Missing" : "Unsupported", sd->name); |
891 |
+ |
return !sdata ? SDEformat : SDEsupport; |
892 |
+ |
} |
893 |
+ |
/* allocate BSDF tree */ |
894 |
+ |
sdt = (SDTre *)malloc(sizeof(SDTre)); |
895 |
+ |
if (sdt == NULL) |
896 |
+ |
return SDEmemory; |
897 |
+ |
if (df == sd->rf) |
898 |
+ |
sdt->sidef = SD_UFRONT; |
899 |
+ |
else if (df == sd->rb) |
900 |
+ |
sdt->sidef = SD_UBACK; |
901 |
+ |
else |
902 |
+ |
sdt->sidef = SD_XMIT; |
903 |
+ |
sdt->st = NULL; |
904 |
+ |
df->comp[0].cspec[0] = c_dfcolor; /* XXX monochrome for now */ |
905 |
+ |
df->comp[0].dist = sdt; |
906 |
+ |
df->comp[0].func = &SDhandleTre; |
907 |
+ |
/* read BSDF data */ |
908 |
+ |
sdata = ezxml_txt(ezxml_child(wdb, "ScatteringData")); |
909 |
+ |
if (!sdata || !next_token(&sdata)) { |
910 |
+ |
sprintf(SDerrorDetail, "Missing BSDF ScatteringData in '%s'", |
911 |
+ |
sd->name); |
912 |
+ |
return SDEformat; |
913 |
+ |
} |
914 |
+ |
sdt->st = load_tree_data(&sdata, ndim); |
915 |
+ |
if (sdt->st == NULL) |
916 |
+ |
return SDEformat; |
917 |
+ |
if (next_token(&sdata)) { /* check for unconsumed characters */ |
918 |
+ |
sprintf(SDerrorDetail, |
919 |
+ |
"Extra characters at end of ScatteringData in '%s'", |
920 |
+ |
sd->name); |
921 |
+ |
return SDEformat; |
922 |
+ |
} |
923 |
+ |
/* flatten branches where possible */ |
924 |
+ |
sdt->st = SDsimplifyTre(sdt->st); |
925 |
+ |
if (sdt->st == NULL) |
926 |
+ |
return SDEinternal; |
927 |
+ |
return get_extrema(df); /* compute global quantities */ |
928 |
+ |
} |
929 |
+ |
|
930 |
+ |
/* Find minimum value in tree */ |
931 |
+ |
static float |
932 |
+ |
SDgetTreMin(const SDNode *st) |
933 |
+ |
{ |
934 |
+ |
float vmin = FHUGE; |
935 |
+ |
int n; |
936 |
+ |
|
937 |
+ |
if (st->log2GR < 0) { |
938 |
+ |
for (n = 1<<st->ndim; n--; ) { |
939 |
+ |
float v = SDgetTreMin(st->u.t[n]); |
940 |
+ |
if (v < vmin) |
941 |
+ |
vmin = v; |
942 |
+ |
} |
943 |
+ |
} else { |
944 |
+ |
for (n = 1<<(st->ndim*st->log2GR); n--; ) |
945 |
+ |
if (st->u.v[n] < vmin) |
946 |
+ |
vmin = st->u.v[n]; |
947 |
+ |
} |
948 |
+ |
return vmin; |
949 |
+ |
} |
950 |
+ |
|
951 |
+ |
/* Subtract the given value from all tree nodes */ |
952 |
+ |
static void |
953 |
+ |
SDsubtractTreVal(SDNode *st, float val) |
954 |
+ |
{ |
955 |
+ |
int n; |
956 |
+ |
|
957 |
+ |
if (st->log2GR < 0) { |
958 |
+ |
for (n = 1<<st->ndim; n--; ) |
959 |
+ |
SDsubtractTreVal(st->u.t[n], val); |
960 |
+ |
} else { |
961 |
+ |
for (n = 1<<(st->ndim*st->log2GR); n--; ) |
962 |
+ |
st->u.v[n] -= val; |
963 |
+ |
} |
964 |
+ |
} |
965 |
+ |
|
966 |
+ |
/* Subtract minimum value from BSDF */ |
967 |
+ |
static double |
968 |
+ |
subtract_min(SDNode *st) |
969 |
+ |
{ |
970 |
+ |
float vmin; |
971 |
+ |
/* be sure to skip unused portion */ |
972 |
+ |
if (st->ndim == 3) { |
973 |
+ |
int n; |
974 |
+ |
vmin = 1./M_PI; |
975 |
+ |
if (st->log2GR < 0) { |
976 |
+ |
for (n = 0; n < 4; n++) { |
977 |
+ |
float v = SDgetTreMin(st->u.t[n]); |
978 |
+ |
if (v < vmin) |
979 |
+ |
vmin = v; |
980 |
+ |
} |
981 |
+ |
} else if (st->log2GR) { |
982 |
+ |
for (n = 1 << (3*st->log2GR - 1); n--; ) |
983 |
+ |
if (st->u.v[n] < vmin) |
984 |
+ |
vmin = st->u.v[n]; |
985 |
+ |
} else |
986 |
+ |
vmin = st->u.v[0]; |
987 |
+ |
} else /* anisotropic covers entire tree */ |
988 |
+ |
vmin = SDgetTreMin(st); |
989 |
+ |
|
990 |
+ |
if (vmin <= FTINY) |
991 |
+ |
return .0; |
992 |
+ |
|
993 |
+ |
SDsubtractTreVal(st, vmin); |
994 |
+ |
|
995 |
+ |
return M_PI * vmin; /* return hemispherical value */ |
996 |
+ |
} |
997 |
+ |
|
998 |
+ |
/* Extract and separate diffuse portion of BSDF */ |
999 |
+ |
static void |
1000 |
+ |
extract_diffuse(SDValue *dv, SDSpectralDF *df) |
1001 |
+ |
{ |
1002 |
+ |
int n; |
1003 |
+ |
|
1004 |
+ |
if (df == NULL || df->ncomp <= 0) { |
1005 |
+ |
dv->spec = c_dfcolor; |
1006 |
+ |
dv->cieY = .0; |
1007 |
+ |
return; |
1008 |
+ |
} |
1009 |
+ |
dv->spec = df->comp[0].cspec[0]; |
1010 |
+ |
dv->cieY = subtract_min((*(SDTre *)df->comp[0].dist).st); |
1011 |
+ |
/* in case of multiple components */ |
1012 |
+ |
for (n = df->ncomp; --n; ) { |
1013 |
+ |
double ymin = subtract_min((*(SDTre *)df->comp[n].dist).st); |
1014 |
+ |
c_cmix(&dv->spec, dv->cieY, &dv->spec, ymin, &df->comp[n].cspec[0]); |
1015 |
+ |
dv->cieY += ymin; |
1016 |
+ |
} |
1017 |
+ |
df->maxHemi -= dv->cieY; /* adjust maximum hemispherical */ |
1018 |
+ |
/* make sure everything is set */ |
1019 |
+ |
c_ccvt(&dv->spec, C_CSXY+C_CSSPEC); |
1020 |
+ |
} |
1021 |
+ |
|
1022 |
|
/* Load a variable-resolution BSDF tree from an open XML file */ |
1023 |
|
SDError |
1024 |
< |
SDloadTre(SDData *sd, ezxml_t fl) |
1024 |
> |
SDloadTre(SDData *sd, ezxml_t wtl) |
1025 |
|
{ |
1026 |
< |
return SDEsupport; |
1026 |
> |
SDError ec; |
1027 |
> |
ezxml_t wld, wdb; |
1028 |
> |
int rank; |
1029 |
> |
char *txt; |
1030 |
> |
/* basic checks and tensor rank */ |
1031 |
> |
txt = ezxml_txt(ezxml_child(ezxml_child(wtl, |
1032 |
> |
"DataDefinition"), "IncidentDataStructure")); |
1033 |
> |
if (txt == NULL || !*txt) { |
1034 |
> |
sprintf(SDerrorDetail, |
1035 |
> |
"BSDF \"%s\": missing IncidentDataStructure", |
1036 |
> |
sd->name); |
1037 |
> |
return SDEformat; |
1038 |
> |
} |
1039 |
> |
if (!strcasecmp(txt, "TensorTree3")) |
1040 |
> |
rank = 3; |
1041 |
> |
else if (!strcasecmp(txt, "TensorTree4")) |
1042 |
> |
rank = 4; |
1043 |
> |
else { |
1044 |
> |
sprintf(SDerrorDetail, |
1045 |
> |
"BSDF \"%s\": unsupported IncidentDataStructure", |
1046 |
> |
sd->name); |
1047 |
> |
return SDEsupport; |
1048 |
> |
} |
1049 |
> |
/* load BSDF components */ |
1050 |
> |
for (wld = ezxml_child(wtl, "WavelengthData"); |
1051 |
> |
wld != NULL; wld = wld->next) { |
1052 |
> |
if (strcasecmp(ezxml_txt(ezxml_child(wld,"Wavelength")), |
1053 |
> |
"Visible")) |
1054 |
> |
continue; /* just visible for now */ |
1055 |
> |
for (wdb = ezxml_child(wld, "WavelengthDataBlock"); |
1056 |
> |
wdb != NULL; wdb = wdb->next) |
1057 |
> |
if ((ec = load_bsdf_data(sd, wdb, rank)) != SDEnone) |
1058 |
> |
return ec; |
1059 |
> |
} |
1060 |
> |
/* separate diffuse components */ |
1061 |
> |
extract_diffuse(&sd->rLambFront, sd->rf); |
1062 |
> |
extract_diffuse(&sd->rLambBack, sd->rb); |
1063 |
> |
extract_diffuse(&sd->tLamb, sd->tf); |
1064 |
> |
/* return success */ |
1065 |
> |
return SDEnone; |
1066 |
|
} |
1067 |
|
|
1068 |
|
/* Variable resolution BSDF methods */ |
1069 |
< |
const SDFunc SDhandleTre = { |
1070 |
< |
NULL, |
1071 |
< |
NULL, |
1072 |
< |
NULL, |
1073 |
< |
NULL, |
1074 |
< |
&SDfreeTree, |
1069 |
> |
SDFunc SDhandleTre = { |
1070 |
> |
&SDgetTreBSDF, |
1071 |
> |
&SDqueryTreProjSA, |
1072 |
> |
&SDgetTreCDist, |
1073 |
> |
&SDsampTreCDist, |
1074 |
> |
&SDFreeBTre, |
1075 |
|
}; |