| 1 |
greg |
3.2 |
#ifndef lint |
| 2 |
greg |
3.6 |
static const char RCSid[] = "$Id: bsdf_m.c,v 3.5 2011/02/19 23:42:09 greg Exp $"; |
| 3 |
greg |
3.2 |
#endif |
| 4 |
greg |
3.1 |
/* |
| 5 |
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* bsdf_m.c |
| 6 |
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* |
| 7 |
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* Definitions supporting BSDF matrices |
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* |
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* Created by Greg Ward on 2/2/11. |
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* Copyright 2011 Anyhere Software. All rights reserved. |
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* |
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*/ |
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greg |
3.3 |
#include "rtio.h" |
| 15 |
greg |
3.1 |
#include <stdlib.h> |
| 16 |
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#include <math.h> |
| 17 |
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#include <ctype.h> |
| 18 |
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#include "ezxml.h" |
| 19 |
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#include "bsdf.h" |
| 20 |
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#include "bsdf_m.h" |
| 21 |
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| 22 |
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/* Function return codes */ |
| 23 |
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#define RC_GOOD 1 |
| 24 |
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#define RC_FAIL 0 |
| 25 |
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#define RC_FORMERR (-1) |
| 26 |
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#define RC_DATERR (-2) |
| 27 |
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#define RC_UNSUPP (-3) |
| 28 |
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#define RC_INTERR (-4) |
| 29 |
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#define RC_MEMERR (-5) |
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| 31 |
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#define MAXLATS 46 /* maximum number of latitudes */ |
| 32 |
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| 33 |
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/* BSDF angle specification */ |
| 34 |
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typedef struct { |
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char name[64]; /* basis name */ |
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int nangles; /* total number of directions */ |
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struct { |
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float tmin; /* starting theta */ |
| 39 |
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int nphis; /* number of phis (0 term) */ |
| 40 |
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} lat[MAXLATS+1]; /* latitudes */ |
| 41 |
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} ANGLE_BASIS; |
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| 43 |
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#define MAXABASES 7 /* limit on defined bases */ |
| 44 |
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| 45 |
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static ANGLE_BASIS abase_list[MAXABASES] = { |
| 46 |
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{ |
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"LBNL/Klems Full", 145, |
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{ {-5., 1}, |
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{5., 8}, |
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{15., 16}, |
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{25., 20}, |
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{35., 24}, |
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{45., 24}, |
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{55., 24}, |
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{65., 16}, |
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{75., 12}, |
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{90., 0} } |
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}, { |
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"LBNL/Klems Half", 73, |
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{ {-6.5, 1}, |
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{6.5, 8}, |
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{19.5, 12}, |
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{32.5, 16}, |
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{46.5, 20}, |
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{61.5, 12}, |
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{76.5, 4}, |
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{90., 0} } |
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}, { |
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"LBNL/Klems Quarter", 41, |
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{ {-9., 1}, |
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{9., 8}, |
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{27., 12}, |
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{46., 12}, |
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{66., 8}, |
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{90., 0} } |
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} |
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}; |
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| 79 |
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static int nabases = 3; /* current number of defined bases */ |
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static int |
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fequal(double a, double b) |
| 83 |
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{ |
| 84 |
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if (b != .0) |
| 85 |
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a = a/b - 1.; |
| 86 |
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return (a <= 1e-6) & (a >= -1e-6); |
| 87 |
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} |
| 88 |
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| 89 |
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/* returns the name of the given tag */ |
| 90 |
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#ifdef ezxml_name |
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#undef ezxml_name |
| 92 |
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static char * |
| 93 |
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ezxml_name(ezxml_t xml) |
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{ |
| 95 |
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if (xml == NULL) |
| 96 |
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return NULL; |
| 97 |
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return xml->name; |
| 98 |
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} |
| 99 |
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#endif |
| 100 |
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| 101 |
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/* returns the given tag's character content or empty string if none */ |
| 102 |
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#ifdef ezxml_txt |
| 103 |
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#undef ezxml_txt |
| 104 |
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static char * |
| 105 |
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ezxml_txt(ezxml_t xml) |
| 106 |
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{ |
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if (xml == NULL) |
| 108 |
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return ""; |
| 109 |
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return xml->txt; |
| 110 |
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} |
| 111 |
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#endif |
| 112 |
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| 113 |
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/* Convert error to standard BSDF code */ |
| 114 |
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static SDError |
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convert_errcode(int ec) |
| 116 |
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{ |
| 117 |
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switch (ec) { |
| 118 |
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case RC_GOOD: |
| 119 |
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return SDEnone; |
| 120 |
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case RC_FORMERR: |
| 121 |
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return SDEformat; |
| 122 |
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case RC_DATERR: |
| 123 |
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return SDEdata; |
| 124 |
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case RC_UNSUPP: |
| 125 |
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return SDEsupport; |
| 126 |
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case RC_INTERR: |
| 127 |
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return SDEinternal; |
| 128 |
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case RC_MEMERR: |
| 129 |
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return SDEmemory; |
| 130 |
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} |
| 131 |
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return SDEunknown; |
| 132 |
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} |
| 133 |
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| 134 |
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/* Allocate a BSDF matrix of the given size */ |
| 135 |
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static SDMat * |
| 136 |
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SDnewMatrix(int ni, int no) |
| 137 |
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{ |
| 138 |
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SDMat *sm; |
| 139 |
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| 140 |
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if ((ni <= 0) | (no <= 0)) { |
| 141 |
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strcpy(SDerrorDetail, "Empty BSDF matrix request"); |
| 142 |
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return NULL; |
| 143 |
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} |
| 144 |
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sm = (SDMat *)malloc(sizeof(SDMat) + (ni*no - 1)*sizeof(float)); |
| 145 |
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if (sm == NULL) { |
| 146 |
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sprintf(SDerrorDetail, "Cannot allocate %dx%d BSDF matrix", |
| 147 |
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ni, no); |
| 148 |
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return NULL; |
| 149 |
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} |
| 150 |
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memset(sm, 0, sizeof(SDMat)-sizeof(float)); |
| 151 |
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sm->ninc = ni; |
| 152 |
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sm->nout = no; |
| 153 |
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| 154 |
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return sm; |
| 155 |
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} |
| 156 |
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| 157 |
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/* Free a BSDF matrix */ |
| 158 |
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#define SDfreeMatrix free |
| 159 |
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| 160 |
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/* get vector for this angle basis index */ |
| 161 |
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static int |
| 162 |
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ab_getvec(FVECT v, int ndx, double randX, void *p) |
| 163 |
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{ |
| 164 |
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ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
| 165 |
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double rx[2]; |
| 166 |
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int li; |
| 167 |
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double pol, azi, d; |
| 168 |
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| 169 |
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if ((ndx < 0) | (ndx >= ab->nangles)) |
| 170 |
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return RC_FAIL; |
| 171 |
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for (li = 0; ndx >= ab->lat[li].nphis; li++) |
| 172 |
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ndx -= ab->lat[li].nphis; |
| 173 |
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SDmultiSamp(rx, 2, randX); |
| 174 |
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pol = M_PI/180.*( (1.-rx[0])*ab->lat[li].tmin + |
| 175 |
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rx[0]*ab->lat[li+1].tmin ); |
| 176 |
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azi = 2.*M_PI*(ndx + rx[1] - .5)/ab->lat[li].nphis; |
| 177 |
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v[2] = d = cos(pol); |
| 178 |
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d = sqrt(1. - d*d); /* sin(pol) */ |
| 179 |
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v[0] = cos(azi)*d; |
| 180 |
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v[1] = sin(azi)*d; |
| 181 |
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return RC_GOOD; |
| 182 |
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} |
| 183 |
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| 184 |
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/* get index corresponding to the given vector */ |
| 185 |
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static int |
| 186 |
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ab_getndx(const FVECT v, void *p) |
| 187 |
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{ |
| 188 |
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ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
| 189 |
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int li, ndx; |
| 190 |
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double pol, azi, d; |
| 191 |
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| 192 |
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if (v == NULL) |
| 193 |
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return -1; |
| 194 |
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if ((v[2] < .0) | (v[2] > 1.0)) |
| 195 |
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return -1; |
| 196 |
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pol = 180.0/M_PI*acos(v[2]); |
| 197 |
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azi = 180.0/M_PI*atan2(v[1], v[0]); |
| 198 |
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if (azi < 0.0) azi += 360.0; |
| 199 |
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for (li = 1; ab->lat[li].tmin <= pol; li++) |
| 200 |
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if (!ab->lat[li].nphis) |
| 201 |
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return -1; |
| 202 |
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--li; |
| 203 |
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ndx = (int)((1./360.)*azi*ab->lat[li].nphis + 0.5); |
| 204 |
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if (ndx >= ab->lat[li].nphis) ndx = 0; |
| 205 |
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while (li--) |
| 206 |
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ndx += ab->lat[li].nphis; |
| 207 |
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return ndx; |
| 208 |
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} |
| 209 |
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| 210 |
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/* compute square of real value */ |
| 211 |
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static double sq(double x) { return x*x; } |
| 212 |
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| 213 |
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/* get projected solid angle for this angle basis index */ |
| 214 |
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static double |
| 215 |
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ab_getohm(int ndx, void *p) |
| 216 |
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{ |
| 217 |
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static int last_li = -1; |
| 218 |
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static double last_ohm; |
| 219 |
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ANGLE_BASIS *ab = (ANGLE_BASIS *)p; |
| 220 |
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int li; |
| 221 |
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double theta, theta1; |
| 222 |
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| 223 |
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if ((ndx < 0) | (ndx >= ab->nangles)) |
| 224 |
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return -1.; |
| 225 |
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for (li = 0; ndx >= ab->lat[li].nphis; li++) |
| 226 |
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ndx -= ab->lat[li].nphis; |
| 227 |
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if (li == last_li) /* cached latitude? */ |
| 228 |
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return last_ohm; |
| 229 |
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last_li = li; |
| 230 |
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theta1 = M_PI/180. * ab->lat[li+1].tmin; |
| 231 |
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if (ab->lat[li].nphis == 1) /* special case */ |
| 232 |
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return last_ohm = M_PI*(1. - sq(cos(theta1))); |
| 233 |
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theta = M_PI/180. * ab->lat[li].tmin; |
| 234 |
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return last_ohm = M_PI*(sq(cos(theta)) - sq(cos(theta1))) / |
| 235 |
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(double)ab->lat[li].nphis; |
| 236 |
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} |
| 237 |
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| 238 |
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/* get reverse vector for this angle basis index */ |
| 239 |
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static int |
| 240 |
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ab_getvecR(FVECT v, int ndx, double randX, void *p) |
| 241 |
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{ |
| 242 |
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int na = (*(ANGLE_BASIS *)p).nangles; |
| 243 |
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| 244 |
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if (!ab_getvec(v, ndx, randX, p)) |
| 245 |
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return RC_FAIL; |
| 246 |
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| 247 |
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v[0] = -v[0]; |
| 248 |
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v[1] = -v[1]; |
| 249 |
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v[2] = -v[2]; |
| 250 |
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| 251 |
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return RC_GOOD; |
| 252 |
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} |
| 253 |
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| 254 |
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/* get index corresponding to the reverse vector */ |
| 255 |
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static int |
| 256 |
|
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ab_getndxR(const FVECT v, void *p) |
| 257 |
|
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{ |
| 258 |
|
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FVECT v2; |
| 259 |
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| 260 |
|
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v2[0] = -v[0]; |
| 261 |
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v2[1] = -v[1]; |
| 262 |
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v2[2] = -v[2]; |
| 263 |
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| 264 |
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return ab_getndx(v2, p); |
| 265 |
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} |
| 266 |
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| 267 |
|
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/* load custom BSDF angle basis */ |
| 268 |
|
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static int |
| 269 |
|
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load_angle_basis(ezxml_t wab) |
| 270 |
|
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{ |
| 271 |
|
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char *abname = ezxml_txt(ezxml_child(wab, "AngleBasisName")); |
| 272 |
|
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ezxml_t wbb; |
| 273 |
|
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int i; |
| 274 |
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| 275 |
|
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if (!abname || !*abname) |
| 276 |
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return RC_FAIL; |
| 277 |
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for (i = nabases; i--; ) |
| 278 |
|
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if (!strcasecmp(abname, abase_list[i].name)) |
| 279 |
|
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return RC_GOOD; /* assume it's the same */ |
| 280 |
|
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if (nabases >= MAXABASES) { |
| 281 |
|
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sprintf(SDerrorDetail, "Out of angle bases reading '%s'", |
| 282 |
|
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abname); |
| 283 |
|
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return RC_INTERR; |
| 284 |
|
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} |
| 285 |
|
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strcpy(abase_list[nabases].name, abname); |
| 286 |
|
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abase_list[nabases].nangles = 0; |
| 287 |
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for (i = 0, wbb = ezxml_child(wab, "AngleBasisBlock"); |
| 288 |
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wbb != NULL; i++, wbb = wbb->next) { |
| 289 |
|
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if (i >= MAXLATS) { |
| 290 |
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sprintf(SDerrorDetail, "Too many latitudes for '%s'", |
| 291 |
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abname); |
| 292 |
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return RC_INTERR; |
| 293 |
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} |
| 294 |
|
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abase_list[nabases].lat[i+1].tmin = atof(ezxml_txt( |
| 295 |
|
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ezxml_child(ezxml_child(wbb, |
| 296 |
|
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"ThetaBounds"), "UpperTheta"))); |
| 297 |
|
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if (!i) |
| 298 |
|
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abase_list[nabases].lat[i].tmin = |
| 299 |
|
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-abase_list[nabases].lat[i+1].tmin; |
| 300 |
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else if (!fequal(atof(ezxml_txt(ezxml_child(ezxml_child(wbb, |
| 301 |
|
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"ThetaBounds"), "LowerTheta"))), |
| 302 |
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abase_list[nabases].lat[i].tmin)) { |
| 303 |
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sprintf(SDerrorDetail, "Theta values disagree in '%s'", |
| 304 |
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abname); |
| 305 |
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return RC_DATERR; |
| 306 |
|
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} |
| 307 |
|
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abase_list[nabases].nangles += |
| 308 |
|
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abase_list[nabases].lat[i].nphis = |
| 309 |
|
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atoi(ezxml_txt(ezxml_child(wbb, "nPhis"))); |
| 310 |
|
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if (abase_list[nabases].lat[i].nphis <= 0 || |
| 311 |
|
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(abase_list[nabases].lat[i].nphis == 1 && |
| 312 |
|
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abase_list[nabases].lat[i].tmin > FTINY)) { |
| 313 |
|
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sprintf(SDerrorDetail, "Illegal phi count in '%s'", |
| 314 |
|
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abname); |
| 315 |
|
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return RC_DATERR; |
| 316 |
|
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} |
| 317 |
|
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} |
| 318 |
|
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abase_list[nabases++].lat[i].nphis = 0; |
| 319 |
|
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return RC_GOOD; |
| 320 |
|
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} |
| 321 |
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|
| 322 |
|
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/* compute min. proj. solid angle and max. direct hemispherical scattering */ |
| 323 |
|
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static int |
| 324 |
|
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get_extrema(SDSpectralDF *df) |
| 325 |
|
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{ |
| 326 |
|
|
SDMat *dp = (SDMat *)df->comp[0].dist; |
| 327 |
|
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double *ohma; |
| 328 |
|
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int i, o; |
| 329 |
|
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/* initialize extrema */ |
| 330 |
|
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df->minProjSA = M_PI; |
| 331 |
|
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df->maxHemi = .0; |
| 332 |
|
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ohma = (double *)malloc(dp->nout*sizeof(double)); |
| 333 |
|
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if (ohma == NULL) |
| 334 |
|
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return RC_MEMERR; |
| 335 |
|
|
/* get outgoing solid angles */ |
| 336 |
|
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for (o = dp->nout; o--; ) |
| 337 |
|
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if ((ohma[o] = mBSDF_outohm(dp,o)) < df->minProjSA) |
| 338 |
|
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df->minProjSA = ohma[o]; |
| 339 |
|
|
/* compute hemispherical sums */ |
| 340 |
|
|
for (i = dp->ninc; i--; ) { |
| 341 |
|
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double hemi = .0; |
| 342 |
|
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for (o = dp->nout; o--; ) |
| 343 |
|
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hemi += ohma[o] * mBSDF_value(dp, i, o); |
| 344 |
|
|
if (hemi > df->maxHemi) |
| 345 |
|
|
df->maxHemi = hemi; |
| 346 |
|
|
} |
| 347 |
|
|
free(ohma); |
| 348 |
|
|
/* need incoming solid angles, too? */ |
| 349 |
greg |
3.5 |
if ((dp->ib_ohm != dp->ob_ohm) | (dp->ib_priv != dp->ob_priv)) { |
| 350 |
greg |
3.1 |
double ohm; |
| 351 |
|
|
for (i = dp->ninc; i--; ) |
| 352 |
|
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if ((ohm = mBSDF_incohm(dp,i)) < df->minProjSA) |
| 353 |
|
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df->minProjSA = ohm; |
| 354 |
|
|
} |
| 355 |
|
|
return (df->maxHemi <= 1.01); |
| 356 |
|
|
} |
| 357 |
|
|
|
| 358 |
|
|
/* load BSDF distribution for this wavelength */ |
| 359 |
|
|
static int |
| 360 |
|
|
load_bsdf_data(SDData *sd, ezxml_t wdb, int rowinc) |
| 361 |
|
|
{ |
| 362 |
|
|
SDSpectralDF *df; |
| 363 |
|
|
SDMat *dp; |
| 364 |
|
|
char *sdata; |
| 365 |
|
|
int inbi, outbi; |
| 366 |
|
|
int i; |
| 367 |
|
|
/* allocate BSDF component */ |
| 368 |
|
|
sdata = ezxml_txt(ezxml_child(wdb, "WavelengthDataDirection")); |
| 369 |
greg |
3.6 |
if (!strcasecmp(sdata, "Transmission Back") || (sd->tf == NULL && |
| 370 |
|
|
!strcasecmp(sdata, "Transmission Front"))) { |
| 371 |
greg |
3.1 |
if (sd->tf != NULL) |
| 372 |
|
|
SDfreeSpectralDF(sd->tf); |
| 373 |
|
|
if ((sd->tf = SDnewSpectralDF(1)) == NULL) |
| 374 |
|
|
return RC_MEMERR; |
| 375 |
|
|
df = sd->tf; |
| 376 |
|
|
} else if (!strcasecmp(sdata, "Reflection Front")) { |
| 377 |
greg |
3.6 |
if (sd->rb != NULL) /* note back-front reversal */ |
| 378 |
|
|
SDfreeSpectralDF(sd->rb); |
| 379 |
|
|
if ((sd->rb = SDnewSpectralDF(1)) == NULL) |
| 380 |
|
|
return RC_MEMERR; |
| 381 |
|
|
df = sd->rb; |
| 382 |
|
|
} else if (!strcasecmp(sdata, "Reflection Back")) { |
| 383 |
|
|
if (sd->rf != NULL) /* note front-back reversal */ |
| 384 |
greg |
3.1 |
SDfreeSpectralDF(sd->rf); |
| 385 |
|
|
if ((sd->rf = SDnewSpectralDF(1)) == NULL) |
| 386 |
|
|
return RC_MEMERR; |
| 387 |
|
|
df = sd->rf; |
| 388 |
|
|
} else |
| 389 |
|
|
return RC_FAIL; |
| 390 |
greg |
3.4 |
/* XXX should also check "ScatteringDataType" for consistency? */ |
| 391 |
greg |
3.1 |
/* get angle bases */ |
| 392 |
|
|
sdata = ezxml_txt(ezxml_child(wdb,"ColumnAngleBasis")); |
| 393 |
|
|
if (!sdata || !*sdata) { |
| 394 |
|
|
sprintf(SDerrorDetail, "Missing column basis for BSDF '%s'", |
| 395 |
|
|
sd->name); |
| 396 |
|
|
return RC_FORMERR; |
| 397 |
|
|
} |
| 398 |
|
|
for (inbi = nabases; inbi--; ) |
| 399 |
greg |
3.4 |
if (!strcasecmp(sdata, abase_list[inbi].name)) |
| 400 |
greg |
3.1 |
break; |
| 401 |
|
|
if (inbi < 0) { |
| 402 |
greg |
3.4 |
sprintf(SDerrorDetail, "Undefined ColumnAngleBasis '%s'", sdata); |
| 403 |
greg |
3.1 |
return RC_FORMERR; |
| 404 |
|
|
} |
| 405 |
|
|
sdata = ezxml_txt(ezxml_child(wdb,"RowAngleBasis")); |
| 406 |
|
|
if (!sdata || !*sdata) { |
| 407 |
|
|
sprintf(SDerrorDetail, "Missing row basis for BSDF '%s'", |
| 408 |
|
|
sd->name); |
| 409 |
|
|
return RC_FORMERR; |
| 410 |
|
|
} |
| 411 |
|
|
for (outbi = nabases; outbi--; ) |
| 412 |
greg |
3.4 |
if (!strcasecmp(sdata, abase_list[outbi].name)) |
| 413 |
greg |
3.1 |
break; |
| 414 |
|
|
if (outbi < 0) { |
| 415 |
greg |
3.4 |
sprintf(SDerrorDetail, "Undefined RowAngleBasis '%s'", sdata); |
| 416 |
greg |
3.1 |
return RC_FORMERR; |
| 417 |
|
|
} |
| 418 |
|
|
/* allocate BSDF matrix */ |
| 419 |
|
|
dp = SDnewMatrix(abase_list[inbi].nangles, abase_list[outbi].nangles); |
| 420 |
|
|
if (dp == NULL) |
| 421 |
|
|
return RC_MEMERR; |
| 422 |
greg |
3.5 |
dp->ib_priv = &abase_list[inbi]; |
| 423 |
|
|
dp->ob_priv = &abase_list[outbi]; |
| 424 |
greg |
3.1 |
if (df == sd->tf) { |
| 425 |
greg |
3.5 |
dp->ib_vec = &ab_getvecR; |
| 426 |
|
|
dp->ib_ndx = &ab_getndxR; |
| 427 |
|
|
dp->ob_vec = &ab_getvec; |
| 428 |
|
|
dp->ob_ndx = &ab_getndx; |
| 429 |
greg |
3.1 |
} else if (df == sd->rf) { |
| 430 |
greg |
3.5 |
dp->ib_vec = &ab_getvec; |
| 431 |
|
|
dp->ib_ndx = &ab_getndx; |
| 432 |
|
|
dp->ob_vec = &ab_getvec; |
| 433 |
|
|
dp->ob_ndx = &ab_getndx; |
| 434 |
greg |
3.1 |
} else /* df == sd->rb */ { |
| 435 |
greg |
3.5 |
dp->ib_vec = &ab_getvecR; |
| 436 |
|
|
dp->ib_ndx = &ab_getndxR; |
| 437 |
|
|
dp->ob_vec = &ab_getvecR; |
| 438 |
|
|
dp->ob_ndx = &ab_getndxR; |
| 439 |
greg |
3.1 |
} |
| 440 |
greg |
3.5 |
dp->ib_ohm = &ab_getohm; |
| 441 |
|
|
dp->ob_ohm = &ab_getohm; |
| 442 |
greg |
3.1 |
df->comp[0].cspec[0] = c_dfcolor; /* XXX monochrome for now */ |
| 443 |
|
|
df->comp[0].dist = dp; |
| 444 |
|
|
df->comp[0].func = &SDhandleMtx; |
| 445 |
|
|
/* read BSDF data */ |
| 446 |
|
|
sdata = ezxml_txt(ezxml_child(wdb,"ScatteringData")); |
| 447 |
|
|
if (!sdata || !*sdata) { |
| 448 |
|
|
sprintf(SDerrorDetail, "Missing BSDF ScatteringData in '%s'", |
| 449 |
|
|
sd->name); |
| 450 |
|
|
return RC_FORMERR; |
| 451 |
|
|
} |
| 452 |
|
|
for (i = 0; i < dp->ninc*dp->nout; i++) { |
| 453 |
greg |
3.3 |
char *sdnext = fskip(sdata); |
| 454 |
greg |
3.1 |
if (sdnext == NULL) { |
| 455 |
|
|
sprintf(SDerrorDetail, |
| 456 |
|
|
"Bad/missing BSDF ScatteringData in '%s'", |
| 457 |
|
|
sd->name); |
| 458 |
|
|
return RC_FORMERR; |
| 459 |
|
|
} |
| 460 |
|
|
while (*sdnext && isspace(*sdnext)) |
| 461 |
|
|
sdnext++; |
| 462 |
|
|
if (*sdnext == ',') sdnext++; |
| 463 |
|
|
if (rowinc) { |
| 464 |
|
|
int r = i/dp->nout; |
| 465 |
|
|
int c = i - c*dp->nout; |
| 466 |
|
|
mBSDF_value(dp,r,c) = atof(sdata); |
| 467 |
|
|
} else |
| 468 |
|
|
dp->bsdf[i] = atof(sdata); |
| 469 |
|
|
sdata = sdnext; |
| 470 |
|
|
} |
| 471 |
|
|
return get_extrema(df); |
| 472 |
|
|
} |
| 473 |
|
|
|
| 474 |
|
|
/* Subtract minimum (diffuse) scattering amount from BSDF */ |
| 475 |
|
|
static double |
| 476 |
|
|
subtract_min(SDMat *sm) |
| 477 |
|
|
{ |
| 478 |
|
|
float minv = sm->bsdf[0]; |
| 479 |
|
|
int n = sm->ninc*sm->nout; |
| 480 |
|
|
int i; |
| 481 |
|
|
|
| 482 |
|
|
for (i = n; --i; ) |
| 483 |
|
|
if (sm->bsdf[i] < minv) |
| 484 |
|
|
minv = sm->bsdf[i]; |
| 485 |
|
|
for (i = n; i--; ) |
| 486 |
|
|
sm->bsdf[i] -= minv; |
| 487 |
|
|
|
| 488 |
|
|
return minv*M_PI; /* be sure to include multiplier */ |
| 489 |
|
|
} |
| 490 |
|
|
|
| 491 |
|
|
/* Extract and separate diffuse portion of BSDF */ |
| 492 |
|
|
static void |
| 493 |
|
|
extract_diffuse(SDValue *dv, SDSpectralDF *df) |
| 494 |
|
|
{ |
| 495 |
|
|
int n; |
| 496 |
|
|
|
| 497 |
|
|
if (df == NULL || df->ncomp <= 0) { |
| 498 |
|
|
dv->spec = c_dfcolor; |
| 499 |
|
|
dv->cieY = .0; |
| 500 |
|
|
return; |
| 501 |
|
|
} |
| 502 |
|
|
dv->spec = df->comp[0].cspec[0]; |
| 503 |
|
|
dv->cieY = subtract_min((SDMat *)df->comp[0].dist); |
| 504 |
|
|
/* in case of multiple components */ |
| 505 |
|
|
for (n = df->ncomp; --n; ) { |
| 506 |
|
|
double ymin = subtract_min((SDMat *)df->comp[n].dist); |
| 507 |
|
|
c_cmix(&dv->spec, dv->cieY, &dv->spec, ymin, &df->comp[n].cspec[0]); |
| 508 |
|
|
dv->cieY += ymin; |
| 509 |
|
|
} |
| 510 |
greg |
3.4 |
df->maxHemi -= dv->cieY; /* adjust minimum hemispherical */ |
| 511 |
|
|
/* make sure everything is set */ |
| 512 |
greg |
3.1 |
c_ccvt(&dv->spec, C_CSXY+C_CSSPEC); |
| 513 |
|
|
} |
| 514 |
|
|
|
| 515 |
|
|
/* Load a BSDF matrix from an open XML file */ |
| 516 |
|
|
SDError |
| 517 |
greg |
3.4 |
SDloadMtx(SDData *sd, ezxml_t wtl) |
| 518 |
greg |
3.1 |
{ |
| 519 |
greg |
3.4 |
ezxml_t wld, wdb; |
| 520 |
greg |
3.1 |
int rowIn; |
| 521 |
|
|
struct BSDF_data *dp; |
| 522 |
|
|
char *txt; |
| 523 |
|
|
int rval; |
| 524 |
|
|
|
| 525 |
greg |
3.4 |
txt = ezxml_txt(ezxml_child(ezxml_child(wtl, |
| 526 |
|
|
"DataDefinition"), "IncidentDataStructure")); |
| 527 |
|
|
if (txt == NULL || !*txt) { |
| 528 |
greg |
3.1 |
sprintf(SDerrorDetail, |
| 529 |
greg |
3.4 |
"BSDF \"%s\": missing IncidentDataStructure", |
| 530 |
greg |
3.1 |
sd->name); |
| 531 |
|
|
return SDEformat; |
| 532 |
|
|
} |
| 533 |
|
|
if (!strcasecmp(txt, "Rows")) |
| 534 |
|
|
rowIn = 1; |
| 535 |
|
|
else if (!strcasecmp(txt, "Columns")) |
| 536 |
|
|
rowIn = 0; |
| 537 |
|
|
else { |
| 538 |
|
|
sprintf(SDerrorDetail, |
| 539 |
|
|
"BSDF \"%s\": unsupported IncidentDataStructure", |
| 540 |
|
|
sd->name); |
| 541 |
|
|
return SDEsupport; |
| 542 |
|
|
} |
| 543 |
|
|
/* get angle basis */ |
| 544 |
|
|
rval = load_angle_basis(ezxml_child(ezxml_child(wtl, |
| 545 |
|
|
"DataDefinition"), "AngleBasis")); |
| 546 |
|
|
if (rval < 0) |
| 547 |
greg |
3.4 |
return convert_errcode(rval); |
| 548 |
greg |
3.1 |
/* load BSDF components */ |
| 549 |
|
|
for (wld = ezxml_child(wtl, "WavelengthData"); |
| 550 |
|
|
wld != NULL; wld = wld->next) { |
| 551 |
|
|
if (strcasecmp(ezxml_txt(ezxml_child(wld,"Wavelength")), |
| 552 |
|
|
"Visible")) |
| 553 |
|
|
continue; /* just visible for now */ |
| 554 |
|
|
for (wdb = ezxml_child(wld, "WavelengthDataBlock"); |
| 555 |
|
|
wdb != NULL; wdb = wdb->next) |
| 556 |
|
|
if ((rval = load_bsdf_data(sd, wdb, rowIn)) < 0) |
| 557 |
greg |
3.4 |
return convert_errcode(rval); |
| 558 |
greg |
3.1 |
} |
| 559 |
|
|
/* separate diffuse components */ |
| 560 |
|
|
extract_diffuse(&sd->rLambFront, sd->rf); |
| 561 |
|
|
extract_diffuse(&sd->rLambBack, sd->rb); |
| 562 |
|
|
extract_diffuse(&sd->tLamb, sd->tf); |
| 563 |
|
|
/* return success */ |
| 564 |
|
|
return SDEnone; |
| 565 |
|
|
} |
| 566 |
|
|
|
| 567 |
|
|
/* Get Matrix BSDF value */ |
| 568 |
|
|
static int |
| 569 |
|
|
SDgetMtxBSDF(float coef[SDmaxCh], const FVECT outVec, |
| 570 |
|
|
const FVECT inVec, const void *dist) |
| 571 |
|
|
{ |
| 572 |
|
|
const SDMat *dp = (const SDMat *)dist; |
| 573 |
|
|
int i_ndx, o_ndx; |
| 574 |
|
|
/* get angle indices */ |
| 575 |
|
|
i_ndx = mBSDF_incndx(dp, inVec); |
| 576 |
|
|
o_ndx = mBSDF_outndx(dp, outVec); |
| 577 |
|
|
/* try reciprocity if necessary */ |
| 578 |
|
|
if ((i_ndx < 0) & (o_ndx < 0)) { |
| 579 |
|
|
i_ndx = mBSDF_incndx(dp, outVec); |
| 580 |
|
|
o_ndx = mBSDF_outndx(dp, inVec); |
| 581 |
|
|
} |
| 582 |
|
|
if ((i_ndx < 0) | (o_ndx < 0)) |
| 583 |
|
|
return 0; /* nothing from this component */ |
| 584 |
|
|
coef[0] = mBSDF_value(dp, i_ndx, o_ndx); |
| 585 |
|
|
return 1; /* XXX monochrome for now */ |
| 586 |
|
|
} |
| 587 |
|
|
|
| 588 |
|
|
/* Query solid angle for vector */ |
| 589 |
|
|
static SDError |
| 590 |
|
|
SDqueryMtxProjSA(double *psa, const FVECT vec, int qflags, const void *dist) |
| 591 |
|
|
{ |
| 592 |
|
|
const SDMat *dp = (const SDMat *)dist; |
| 593 |
greg |
3.5 |
double inc_psa, out_psa; |
| 594 |
|
|
/* check arguments */ |
| 595 |
|
|
if ((psa == NULL) | (vec == NULL) | (dp == NULL)) |
| 596 |
greg |
3.1 |
return SDEargument; |
| 597 |
greg |
3.5 |
/* get projected solid angles */ |
| 598 |
|
|
inc_psa = mBSDF_incohm(dp, mBSDF_incndx(dp, vec)); |
| 599 |
|
|
out_psa = mBSDF_outohm(dp, mBSDF_outndx(dp, vec)); |
| 600 |
|
|
|
| 601 |
|
|
switch (qflags) { /* record based on flag settings */ |
| 602 |
|
|
case SDqueryVal: |
| 603 |
|
|
psa[0] = .0; |
| 604 |
|
|
/* fall through */ |
| 605 |
|
|
case SDqueryMax: |
| 606 |
|
|
if (inc_psa > psa[0]) |
| 607 |
|
|
psa[0] = inc_psa; |
| 608 |
|
|
if (out_psa > psa[0]) |
| 609 |
|
|
psa[0] = out_psa; |
| 610 |
|
|
break; |
| 611 |
|
|
case SDqueryMin+SDqueryMax: |
| 612 |
|
|
if (inc_psa > psa[0]) |
| 613 |
|
|
psa[1] = inc_psa; |
| 614 |
|
|
if (out_psa > psa[0]) |
| 615 |
|
|
psa[1] = out_psa; |
| 616 |
|
|
/* fall through */ |
| 617 |
|
|
case SDqueryMin: |
| 618 |
|
|
if ((inc_psa > .0) & (inc_psa < psa[0])) |
| 619 |
greg |
3.1 |
psa[0] = inc_psa; |
| 620 |
greg |
3.5 |
if ((out_psa > .0) & (out_psa < psa[0])) |
| 621 |
|
|
psa[0] = out_psa; |
| 622 |
|
|
break; |
| 623 |
greg |
3.1 |
} |
| 624 |
greg |
3.5 |
/* make sure it's legal */ |
| 625 |
|
|
return (psa[0] <= .0) ? SDEinternal : SDEnone; |
| 626 |
greg |
3.1 |
} |
| 627 |
|
|
|
| 628 |
|
|
/* Compute new cumulative distribution from BSDF */ |
| 629 |
|
|
static int |
| 630 |
|
|
make_cdist(SDMatCDst *cd, const FVECT inVec, SDMat *dp, int rev) |
| 631 |
|
|
{ |
| 632 |
|
|
const unsigned maxval = ~0; |
| 633 |
|
|
double *cmtab, scale; |
| 634 |
|
|
int o; |
| 635 |
|
|
|
| 636 |
|
|
cmtab = (double *)malloc((cd->calen+1)*sizeof(double)); |
| 637 |
|
|
if (cmtab == NULL) |
| 638 |
|
|
return 0; |
| 639 |
|
|
cmtab[0] = .0; |
| 640 |
|
|
for (o = 0; o < cd->calen; o++) { |
| 641 |
|
|
if (rev) |
| 642 |
|
|
cmtab[o+1] = mBSDF_value(dp, o, cd->indx) * |
| 643 |
|
|
(*dp->ib_ohm)(o, dp->ib_priv); |
| 644 |
|
|
else |
| 645 |
|
|
cmtab[o+1] = mBSDF_value(dp, cd->indx, o) * |
| 646 |
|
|
(*dp->ob_ohm)(o, dp->ob_priv); |
| 647 |
|
|
cmtab[o+1] += cmtab[o]; |
| 648 |
|
|
} |
| 649 |
|
|
cd->cTotal = cmtab[cd->calen]; |
| 650 |
|
|
scale = (double)maxval / cd->cTotal; |
| 651 |
|
|
cd->carr[0] = 0; |
| 652 |
|
|
for (o = 1; o < cd->calen; o++) |
| 653 |
|
|
cd->carr[o] = scale*cmtab[o] + .5; |
| 654 |
|
|
cd->carr[cd->calen] = maxval; |
| 655 |
|
|
free(cmtab); |
| 656 |
|
|
return 1; |
| 657 |
|
|
} |
| 658 |
|
|
|
| 659 |
|
|
/* Get cumulative distribution for matrix BSDF */ |
| 660 |
|
|
static const SDCDst * |
| 661 |
|
|
SDgetMtxCDist(const FVECT inVec, SDComponent *sdc) |
| 662 |
|
|
{ |
| 663 |
|
|
SDMat *dp = (SDMat *)sdc->dist; |
| 664 |
|
|
int reverse; |
| 665 |
|
|
SDMatCDst myCD; |
| 666 |
|
|
SDMatCDst *cd, *cdlast; |
| 667 |
greg |
3.5 |
/* check arguments */ |
| 668 |
|
|
if ((inVec == NULL) | (dp == NULL)) |
| 669 |
greg |
3.1 |
return NULL; |
| 670 |
|
|
memset(&myCD, 0, sizeof(myCD)); |
| 671 |
|
|
myCD.indx = mBSDF_incndx(dp, inVec); |
| 672 |
|
|
if (myCD.indx >= 0) { |
| 673 |
|
|
myCD.ob_priv = dp->ob_priv; |
| 674 |
|
|
myCD.ob_vec = dp->ob_vec; |
| 675 |
|
|
myCD.calen = dp->nout; |
| 676 |
|
|
reverse = 0; |
| 677 |
|
|
} else { /* try reciprocity */ |
| 678 |
|
|
myCD.indx = mBSDF_outndx(dp, inVec); |
| 679 |
|
|
if (myCD.indx < 0) |
| 680 |
|
|
return NULL; |
| 681 |
|
|
myCD.ob_priv = dp->ib_priv; |
| 682 |
|
|
myCD.ob_vec = dp->ib_vec; |
| 683 |
|
|
myCD.calen = dp->ninc; |
| 684 |
|
|
reverse = 1; |
| 685 |
|
|
} |
| 686 |
|
|
cdlast = NULL; /* check for it in cache list */ |
| 687 |
|
|
for (cd = (SDMatCDst *)sdc->cdList; |
| 688 |
|
|
cd != NULL; cd = (SDMatCDst *)cd->next) { |
| 689 |
|
|
if (cd->indx == myCD.indx && (cd->calen == myCD.calen) & |
| 690 |
|
|
(cd->ob_priv == myCD.ob_priv) & |
| 691 |
|
|
(cd->ob_vec == myCD.ob_vec)) |
| 692 |
|
|
break; |
| 693 |
|
|
cdlast = cd; |
| 694 |
|
|
} |
| 695 |
|
|
if (cd == NULL) { /* need to allocate new entry */ |
| 696 |
|
|
cd = (SDMatCDst *)malloc(sizeof(SDMatCDst) + |
| 697 |
|
|
myCD.calen*sizeof(myCD.carr[0])); |
| 698 |
|
|
if (cd == NULL) |
| 699 |
|
|
return NULL; |
| 700 |
|
|
*cd = myCD; /* compute cumulative distribution */ |
| 701 |
|
|
if (!make_cdist(cd, inVec, dp, reverse)) { |
| 702 |
|
|
free(cd); |
| 703 |
|
|
return NULL; |
| 704 |
|
|
} |
| 705 |
|
|
cdlast = cd; |
| 706 |
|
|
} |
| 707 |
|
|
if (cdlast != NULL) { /* move entry to head of cache list */ |
| 708 |
|
|
cdlast->next = cd->next; |
| 709 |
|
|
cd->next = sdc->cdList; |
| 710 |
|
|
sdc->cdList = (SDCDst *)cd; |
| 711 |
|
|
} |
| 712 |
|
|
return (SDCDst *)cd; /* ready to go */ |
| 713 |
|
|
} |
| 714 |
|
|
|
| 715 |
|
|
/* Sample cumulative distribution */ |
| 716 |
|
|
static SDError |
| 717 |
|
|
SDsampMtxCDist(FVECT outVec, double randX, const SDCDst *cdp) |
| 718 |
|
|
{ |
| 719 |
|
|
const unsigned maxval = ~0; |
| 720 |
|
|
const SDMatCDst *mcd = (const SDMatCDst *)cdp; |
| 721 |
|
|
const unsigned target = randX*maxval; |
| 722 |
|
|
int i, iupper, ilower; |
| 723 |
greg |
3.5 |
/* check arguments */ |
| 724 |
|
|
if ((outVec == NULL) | (mcd == NULL)) |
| 725 |
|
|
return SDEargument; |
| 726 |
greg |
3.1 |
/* binary search to find index */ |
| 727 |
|
|
ilower = 0; iupper = mcd->calen; |
| 728 |
|
|
while ((i = (iupper + ilower) >> 1) != ilower) |
| 729 |
|
|
if ((long)target >= (long)mcd->carr[i]) |
| 730 |
|
|
ilower = i; |
| 731 |
|
|
else |
| 732 |
|
|
iupper = i; |
| 733 |
|
|
/* localize random position */ |
| 734 |
|
|
randX = (randX*maxval - mcd->carr[ilower]) / |
| 735 |
|
|
(double)(mcd->carr[iupper] - mcd->carr[ilower]); |
| 736 |
|
|
/* convert index to vector */ |
| 737 |
|
|
if ((*mcd->ob_vec)(outVec, i, randX, mcd->ob_priv)) |
| 738 |
|
|
return SDEnone; |
| 739 |
|
|
strcpy(SDerrorDetail, "BSDF sampling fault"); |
| 740 |
|
|
return SDEinternal; |
| 741 |
|
|
} |
| 742 |
|
|
|
| 743 |
|
|
/* Fixed resolution BSDF methods */ |
| 744 |
|
|
SDFunc SDhandleMtx = { |
| 745 |
|
|
&SDgetMtxBSDF, |
| 746 |
|
|
&SDqueryMtxProjSA, |
| 747 |
|
|
&SDgetMtxCDist, |
| 748 |
|
|
&SDsampMtxCDist, |
| 749 |
|
|
&SDfreeMatrix, |
| 750 |
|
|
}; |
