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greg |
3.2 |
#ifndef lint
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greg |
3.7 |
static const char RCSid[] = "$Id: bsdf_m.c,v 3.6 2011/02/21 22:50:37 greg Exp $";
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greg |
3.2 |
#endif
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greg |
3.1 |
/*
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* bsdf_m.c
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*
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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"
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greg |
3.1 |
#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_m.h"
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| 22 |
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/* Function return codes */
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#define RC_GOOD 1
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#define RC_FAIL 0
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#define RC_FORMERR (-1)
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#define RC_DATERR (-2)
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#define RC_UNSUPP (-3)
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#define RC_INTERR (-4)
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#define RC_MEMERR (-5)
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#define MAXLATS 46 /* maximum number of latitudes */
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/* BSDF angle specification */
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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 */
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int nphis; /* number of phis (0 term) */
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} lat[MAXLATS+1]; /* latitudes */
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} ANGLE_BASIS;
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#define MAXABASES 7 /* limit on defined bases */
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| 45 |
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static ANGLE_BASIS abase_list[MAXABASES] = {
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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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| 81 |
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static int
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fequal(double a, double b)
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{
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if (b != .0)
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a = a/b - 1.;
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return (a <= 1e-6) & (a >= -1e-6);
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}
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| 89 |
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/* returns the name of the given tag */
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#ifdef ezxml_name
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#undef ezxml_name
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static char *
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ezxml_name(ezxml_t xml)
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{
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| 95 |
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if (xml == NULL)
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return NULL;
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return xml->name;
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}
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#endif
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/* returns the given tag's character content or empty string if none */
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#ifdef ezxml_txt
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#undef ezxml_txt
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static char *
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ezxml_txt(ezxml_t xml)
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{
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if (xml == NULL)
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return "";
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return xml->txt;
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}
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#endif
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| 113 |
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/* Convert error to standard BSDF code */
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static SDError
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convert_errcode(int ec)
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{
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switch (ec) {
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case RC_GOOD:
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return SDEnone;
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case RC_FORMERR:
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return SDEformat;
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case RC_DATERR:
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return SDEdata;
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case RC_UNSUPP:
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return SDEsupport;
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case RC_INTERR:
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return SDEinternal;
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case RC_MEMERR:
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return SDEmemory;
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}
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return SDEunknown;
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}
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| 134 |
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/* Allocate a BSDF matrix of the given size */
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static SDMat *
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SDnewMatrix(int ni, int no)
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{
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SDMat *sm;
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if ((ni <= 0) | (no <= 0)) {
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strcpy(SDerrorDetail, "Empty BSDF matrix request");
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return NULL;
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}
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sm = (SDMat *)malloc(sizeof(SDMat) + (ni*no - 1)*sizeof(float));
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if (sm == NULL) {
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sprintf(SDerrorDetail, "Cannot allocate %dx%d BSDF matrix",
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ni, no);
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return NULL;
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}
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memset(sm, 0, sizeof(SDMat)-sizeof(float));
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sm->ninc = ni;
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sm->nout = no;
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| 154 |
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return sm;
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}
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| 157 |
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/* Free a BSDF matrix */
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#define SDfreeMatrix free
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| 159 |
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| 160 |
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/* get vector for this angle basis index */
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static int
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ab_getvec(FVECT v, int ndx, double randX, void *p)
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| 163 |
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{
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| 164 |
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ANGLE_BASIS *ab = (ANGLE_BASIS *)p;
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| 165 |
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double rx[2];
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| 166 |
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int li;
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| 167 |
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double pol, azi, d;
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| 168 |
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| 169 |
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if ((ndx < 0) | (ndx >= ab->nangles))
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| 170 |
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return RC_FAIL;
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| 171 |
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for (li = 0; ndx >= ab->lat[li].nphis; li++)
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| 172 |
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ndx -= ab->lat[li].nphis;
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| 173 |
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SDmultiSamp(rx, 2, randX);
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| 174 |
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pol = M_PI/180.*( (1.-rx[0])*ab->lat[li].tmin +
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rx[0]*ab->lat[li+1].tmin );
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azi = 2.*M_PI*(ndx + rx[1] - .5)/ab->lat[li].nphis;
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v[2] = d = cos(pol);
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d = sqrt(1. - d*d); /* sin(pol) */
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v[0] = cos(azi)*d;
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| 180 |
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v[1] = sin(azi)*d;
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| 181 |
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return RC_GOOD;
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}
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| 183 |
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| 184 |
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/* get index corresponding to the given vector */
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| 185 |
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static int
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ab_getndx(const FVECT v, void *p)
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| 187 |
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{
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| 188 |
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ANGLE_BASIS *ab = (ANGLE_BASIS *)p;
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| 189 |
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int li, ndx;
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| 190 |
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double pol, azi, d;
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| 191 |
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| 192 |
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if (v == NULL)
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| 193 |
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return -1;
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| 194 |
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if ((v[2] < .0) | (v[2] > 1.0))
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| 195 |
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return -1;
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| 196 |
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pol = 180.0/M_PI*acos(v[2]);
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| 197 |
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azi = 180.0/M_PI*atan2(v[1], v[0]);
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| 198 |
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if (azi < 0.0) azi += 360.0;
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| 199 |
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for (li = 1; ab->lat[li].tmin <= pol; li++)
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| 200 |
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if (!ab->lat[li].nphis)
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| 201 |
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return -1;
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| 202 |
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--li;
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| 203 |
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ndx = (int)((1./360.)*azi*ab->lat[li].nphis + 0.5);
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| 204 |
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if (ndx >= ab->lat[li].nphis) ndx = 0;
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| 205 |
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while (li--)
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| 206 |
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ndx += ab->lat[li].nphis;
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| 207 |
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return ndx;
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| 208 |
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}
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| 209 |
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| 210 |
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/* compute square of real value */
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| 211 |
|
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static double sq(double x) { return x*x; }
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| 212 |
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| 213 |
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/* get projected solid angle for this angle basis index */
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| 214 |
|
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static double
|
| 215 |
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ab_getohm(int ndx, void *p)
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| 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)));
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| 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))) /
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| 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 |
|
|
|
| 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 |
|
|
if (nabases >= MAXABASES) {
|
| 281 |
|
|
sprintf(SDerrorDetail, "Out of angle bases reading '%s'",
|
| 282 |
|
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abname);
|
| 283 |
|
|
return RC_INTERR;
|
| 284 |
|
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}
|
| 285 |
|
|
strcpy(abase_list[nabases].name, abname);
|
| 286 |
|
|
abase_list[nabases].nangles = 0;
|
| 287 |
|
|
for (i = 0, wbb = ezxml_child(wab, "AngleBasisBlock");
|
| 288 |
|
|
wbb != NULL; i++, wbb = wbb->next) {
|
| 289 |
|
|
if (i >= MAXLATS) {
|
| 290 |
|
|
sprintf(SDerrorDetail, "Too many latitudes for '%s'",
|
| 291 |
|
|
abname);
|
| 292 |
|
|
return RC_INTERR;
|
| 293 |
|
|
}
|
| 294 |
|
|
abase_list[nabases].lat[i+1].tmin = atof(ezxml_txt(
|
| 295 |
|
|
ezxml_child(ezxml_child(wbb,
|
| 296 |
|
|
"ThetaBounds"), "UpperTheta")));
|
| 297 |
|
|
if (!i)
|
| 298 |
|
|
abase_list[nabases].lat[i].tmin =
|
| 299 |
|
|
-abase_list[nabases].lat[i+1].tmin;
|
| 300 |
|
|
else if (!fequal(atof(ezxml_txt(ezxml_child(ezxml_child(wbb,
|
| 301 |
|
|
"ThetaBounds"), "LowerTheta"))),
|
| 302 |
|
|
abase_list[nabases].lat[i].tmin)) {
|
| 303 |
|
|
sprintf(SDerrorDetail, "Theta values disagree in '%s'",
|
| 304 |
|
|
abname);
|
| 305 |
|
|
return RC_DATERR;
|
| 306 |
|
|
}
|
| 307 |
|
|
abase_list[nabases].nangles +=
|
| 308 |
|
|
abase_list[nabases].lat[i].nphis =
|
| 309 |
|
|
atoi(ezxml_txt(ezxml_child(wbb, "nPhis")));
|
| 310 |
|
|
if (abase_list[nabases].lat[i].nphis <= 0 ||
|
| 311 |
|
|
(abase_list[nabases].lat[i].nphis == 1 &&
|
| 312 |
|
|
abase_list[nabases].lat[i].tmin > FTINY)) {
|
| 313 |
|
|
sprintf(SDerrorDetail, "Illegal phi count in '%s'",
|
| 314 |
|
|
abname);
|
| 315 |
|
|
return RC_DATERR;
|
| 316 |
|
|
}
|
| 317 |
|
|
}
|
| 318 |
|
|
abase_list[nabases++].lat[i].nphis = 0;
|
| 319 |
|
|
return RC_GOOD;
|
| 320 |
|
|
}
|
| 321 |
|
|
|
| 322 |
|
|
/* compute min. proj. solid angle and max. direct hemispherical scattering */
|
| 323 |
|
|
static int
|
| 324 |
|
|
get_extrema(SDSpectralDF *df)
|
| 325 |
|
|
{
|
| 326 |
|
|
SDMat *dp = (SDMat *)df->comp[0].dist;
|
| 327 |
|
|
double *ohma;
|
| 328 |
|
|
int i, o;
|
| 329 |
|
|
/* initialize extrema */
|
| 330 |
|
|
df->minProjSA = M_PI;
|
| 331 |
|
|
df->maxHemi = .0;
|
| 332 |
|
|
ohma = (double *)malloc(dp->nout*sizeof(double));
|
| 333 |
|
|
if (ohma == NULL)
|
| 334 |
|
|
return RC_MEMERR;
|
| 335 |
|
|
/* get outgoing solid angles */
|
| 336 |
|
|
for (o = dp->nout; o--; )
|
| 337 |
|
|
if ((ohma[o] = mBSDF_outohm(dp,o)) < df->minProjSA)
|
| 338 |
|
|
df->minProjSA = ohma[o];
|
| 339 |
|
|
/* compute hemispherical sums */
|
| 340 |
|
|
for (i = dp->ninc; i--; ) {
|
| 341 |
|
|
double hemi = .0;
|
| 342 |
|
|
for (o = dp->nout; o--; )
|
| 343 |
|
|
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 |
|
|
if ((ohm = mBSDF_incohm(dp,i)) < df->minProjSA)
|
| 353 |
|
|
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 |
greg |
3.7 |
int tback;
|
| 366 |
greg |
3.1 |
int inbi, outbi;
|
| 367 |
|
|
int i;
|
| 368 |
|
|
/* allocate BSDF component */
|
| 369 |
|
|
sdata = ezxml_txt(ezxml_child(wdb, "WavelengthDataDirection"));
|
| 370 |
greg |
3.7 |
if ((tback = !strcasecmp(sdata, "Transmission Back")) ||
|
| 371 |
|
|
(sd->tf == NULL &&
|
| 372 |
|
|
!strcasecmp(sdata, "Transmission Front"))) {
|
| 373 |
greg |
3.1 |
if (sd->tf != NULL)
|
| 374 |
|
|
SDfreeSpectralDF(sd->tf);
|
| 375 |
|
|
if ((sd->tf = SDnewSpectralDF(1)) == NULL)
|
| 376 |
|
|
return RC_MEMERR;
|
| 377 |
|
|
df = sd->tf;
|
| 378 |
|
|
} else if (!strcasecmp(sdata, "Reflection Front")) {
|
| 379 |
greg |
3.6 |
if (sd->rb != NULL) /* note back-front reversal */
|
| 380 |
|
|
SDfreeSpectralDF(sd->rb);
|
| 381 |
|
|
if ((sd->rb = SDnewSpectralDF(1)) == NULL)
|
| 382 |
|
|
return RC_MEMERR;
|
| 383 |
|
|
df = sd->rb;
|
| 384 |
|
|
} else if (!strcasecmp(sdata, "Reflection Back")) {
|
| 385 |
|
|
if (sd->rf != NULL) /* note front-back reversal */
|
| 386 |
greg |
3.1 |
SDfreeSpectralDF(sd->rf);
|
| 387 |
|
|
if ((sd->rf = SDnewSpectralDF(1)) == NULL)
|
| 388 |
|
|
return RC_MEMERR;
|
| 389 |
|
|
df = sd->rf;
|
| 390 |
|
|
} else
|
| 391 |
|
|
return RC_FAIL;
|
| 392 |
greg |
3.4 |
/* XXX should also check "ScatteringDataType" for consistency? */
|
| 393 |
greg |
3.1 |
/* get angle bases */
|
| 394 |
|
|
sdata = ezxml_txt(ezxml_child(wdb,"ColumnAngleBasis"));
|
| 395 |
|
|
if (!sdata || !*sdata) {
|
| 396 |
|
|
sprintf(SDerrorDetail, "Missing column basis for BSDF '%s'",
|
| 397 |
|
|
sd->name);
|
| 398 |
|
|
return RC_FORMERR;
|
| 399 |
|
|
}
|
| 400 |
|
|
for (inbi = nabases; inbi--; )
|
| 401 |
greg |
3.4 |
if (!strcasecmp(sdata, abase_list[inbi].name))
|
| 402 |
greg |
3.1 |
break;
|
| 403 |
|
|
if (inbi < 0) {
|
| 404 |
greg |
3.4 |
sprintf(SDerrorDetail, "Undefined ColumnAngleBasis '%s'", sdata);
|
| 405 |
greg |
3.1 |
return RC_FORMERR;
|
| 406 |
|
|
}
|
| 407 |
|
|
sdata = ezxml_txt(ezxml_child(wdb,"RowAngleBasis"));
|
| 408 |
|
|
if (!sdata || !*sdata) {
|
| 409 |
|
|
sprintf(SDerrorDetail, "Missing row basis for BSDF '%s'",
|
| 410 |
|
|
sd->name);
|
| 411 |
|
|
return RC_FORMERR;
|
| 412 |
|
|
}
|
| 413 |
|
|
for (outbi = nabases; outbi--; )
|
| 414 |
greg |
3.4 |
if (!strcasecmp(sdata, abase_list[outbi].name))
|
| 415 |
greg |
3.1 |
break;
|
| 416 |
|
|
if (outbi < 0) {
|
| 417 |
greg |
3.4 |
sprintf(SDerrorDetail, "Undefined RowAngleBasis '%s'", sdata);
|
| 418 |
greg |
3.1 |
return RC_FORMERR;
|
| 419 |
|
|
}
|
| 420 |
|
|
/* allocate BSDF matrix */
|
| 421 |
|
|
dp = SDnewMatrix(abase_list[inbi].nangles, abase_list[outbi].nangles);
|
| 422 |
|
|
if (dp == NULL)
|
| 423 |
|
|
return RC_MEMERR;
|
| 424 |
greg |
3.5 |
dp->ib_priv = &abase_list[inbi];
|
| 425 |
|
|
dp->ob_priv = &abase_list[outbi];
|
| 426 |
greg |
3.1 |
if (df == sd->tf) {
|
| 427 |
greg |
3.7 |
if (tback) {
|
| 428 |
|
|
dp->ib_vec = &ab_getvecR;
|
| 429 |
|
|
dp->ib_ndx = &ab_getndxR;
|
| 430 |
|
|
dp->ob_vec = &ab_getvec;
|
| 431 |
|
|
dp->ob_ndx = &ab_getndx;
|
| 432 |
|
|
} else {
|
| 433 |
|
|
dp->ib_vec = &ab_getvec;
|
| 434 |
|
|
dp->ib_ndx = &ab_getndx;
|
| 435 |
|
|
dp->ob_vec = &ab_getvecR;
|
| 436 |
|
|
dp->ob_ndx = &ab_getndxR;
|
| 437 |
|
|
}
|
| 438 |
greg |
3.1 |
} else if (df == sd->rf) {
|
| 439 |
greg |
3.5 |
dp->ib_vec = &ab_getvec;
|
| 440 |
|
|
dp->ib_ndx = &ab_getndx;
|
| 441 |
|
|
dp->ob_vec = &ab_getvec;
|
| 442 |
|
|
dp->ob_ndx = &ab_getndx;
|
| 443 |
greg |
3.1 |
} else /* df == sd->rb */ {
|
| 444 |
greg |
3.5 |
dp->ib_vec = &ab_getvecR;
|
| 445 |
|
|
dp->ib_ndx = &ab_getndxR;
|
| 446 |
|
|
dp->ob_vec = &ab_getvecR;
|
| 447 |
|
|
dp->ob_ndx = &ab_getndxR;
|
| 448 |
greg |
3.1 |
}
|
| 449 |
greg |
3.5 |
dp->ib_ohm = &ab_getohm;
|
| 450 |
|
|
dp->ob_ohm = &ab_getohm;
|
| 451 |
greg |
3.1 |
df->comp[0].cspec[0] = c_dfcolor; /* XXX monochrome for now */
|
| 452 |
|
|
df->comp[0].dist = dp;
|
| 453 |
|
|
df->comp[0].func = &SDhandleMtx;
|
| 454 |
|
|
/* read BSDF data */
|
| 455 |
|
|
sdata = ezxml_txt(ezxml_child(wdb,"ScatteringData"));
|
| 456 |
|
|
if (!sdata || !*sdata) {
|
| 457 |
|
|
sprintf(SDerrorDetail, "Missing BSDF ScatteringData in '%s'",
|
| 458 |
|
|
sd->name);
|
| 459 |
|
|
return RC_FORMERR;
|
| 460 |
|
|
}
|
| 461 |
|
|
for (i = 0; i < dp->ninc*dp->nout; i++) {
|
| 462 |
greg |
3.3 |
char *sdnext = fskip(sdata);
|
| 463 |
greg |
3.1 |
if (sdnext == NULL) {
|
| 464 |
|
|
sprintf(SDerrorDetail,
|
| 465 |
|
|
"Bad/missing BSDF ScatteringData in '%s'",
|
| 466 |
|
|
sd->name);
|
| 467 |
|
|
return RC_FORMERR;
|
| 468 |
|
|
}
|
| 469 |
|
|
while (*sdnext && isspace(*sdnext))
|
| 470 |
|
|
sdnext++;
|
| 471 |
|
|
if (*sdnext == ',') sdnext++;
|
| 472 |
|
|
if (rowinc) {
|
| 473 |
|
|
int r = i/dp->nout;
|
| 474 |
|
|
int c = i - c*dp->nout;
|
| 475 |
|
|
mBSDF_value(dp,r,c) = atof(sdata);
|
| 476 |
|
|
} else
|
| 477 |
|
|
dp->bsdf[i] = atof(sdata);
|
| 478 |
|
|
sdata = sdnext;
|
| 479 |
|
|
}
|
| 480 |
|
|
return get_extrema(df);
|
| 481 |
|
|
}
|
| 482 |
|
|
|
| 483 |
|
|
/* Subtract minimum (diffuse) scattering amount from BSDF */
|
| 484 |
|
|
static double
|
| 485 |
|
|
subtract_min(SDMat *sm)
|
| 486 |
|
|
{
|
| 487 |
|
|
float minv = sm->bsdf[0];
|
| 488 |
|
|
int n = sm->ninc*sm->nout;
|
| 489 |
|
|
int i;
|
| 490 |
|
|
|
| 491 |
|
|
for (i = n; --i; )
|
| 492 |
|
|
if (sm->bsdf[i] < minv)
|
| 493 |
|
|
minv = sm->bsdf[i];
|
| 494 |
|
|
for (i = n; i--; )
|
| 495 |
|
|
sm->bsdf[i] -= minv;
|
| 496 |
|
|
|
| 497 |
|
|
return minv*M_PI; /* be sure to include multiplier */
|
| 498 |
|
|
}
|
| 499 |
|
|
|
| 500 |
|
|
/* Extract and separate diffuse portion of BSDF */
|
| 501 |
|
|
static void
|
| 502 |
|
|
extract_diffuse(SDValue *dv, SDSpectralDF *df)
|
| 503 |
|
|
{
|
| 504 |
|
|
int n;
|
| 505 |
|
|
|
| 506 |
|
|
if (df == NULL || df->ncomp <= 0) {
|
| 507 |
|
|
dv->spec = c_dfcolor;
|
| 508 |
|
|
dv->cieY = .0;
|
| 509 |
|
|
return;
|
| 510 |
|
|
}
|
| 511 |
|
|
dv->spec = df->comp[0].cspec[0];
|
| 512 |
|
|
dv->cieY = subtract_min((SDMat *)df->comp[0].dist);
|
| 513 |
|
|
/* in case of multiple components */
|
| 514 |
|
|
for (n = df->ncomp; --n; ) {
|
| 515 |
|
|
double ymin = subtract_min((SDMat *)df->comp[n].dist);
|
| 516 |
|
|
c_cmix(&dv->spec, dv->cieY, &dv->spec, ymin, &df->comp[n].cspec[0]);
|
| 517 |
|
|
dv->cieY += ymin;
|
| 518 |
|
|
}
|
| 519 |
greg |
3.4 |
df->maxHemi -= dv->cieY; /* adjust minimum hemispherical */
|
| 520 |
|
|
/* make sure everything is set */
|
| 521 |
greg |
3.1 |
c_ccvt(&dv->spec, C_CSXY+C_CSSPEC);
|
| 522 |
|
|
}
|
| 523 |
|
|
|
| 524 |
|
|
/* Load a BSDF matrix from an open XML file */
|
| 525 |
|
|
SDError
|
| 526 |
greg |
3.4 |
SDloadMtx(SDData *sd, ezxml_t wtl)
|
| 527 |
greg |
3.1 |
{
|
| 528 |
greg |
3.4 |
ezxml_t wld, wdb;
|
| 529 |
greg |
3.1 |
int rowIn;
|
| 530 |
|
|
struct BSDF_data *dp;
|
| 531 |
|
|
char *txt;
|
| 532 |
|
|
int rval;
|
| 533 |
|
|
|
| 534 |
greg |
3.4 |
txt = ezxml_txt(ezxml_child(ezxml_child(wtl,
|
| 535 |
|
|
"DataDefinition"), "IncidentDataStructure"));
|
| 536 |
|
|
if (txt == NULL || !*txt) {
|
| 537 |
greg |
3.1 |
sprintf(SDerrorDetail,
|
| 538 |
greg |
3.4 |
"BSDF \"%s\": missing IncidentDataStructure",
|
| 539 |
greg |
3.1 |
sd->name);
|
| 540 |
|
|
return SDEformat;
|
| 541 |
|
|
}
|
| 542 |
|
|
if (!strcasecmp(txt, "Rows"))
|
| 543 |
|
|
rowIn = 1;
|
| 544 |
|
|
else if (!strcasecmp(txt, "Columns"))
|
| 545 |
|
|
rowIn = 0;
|
| 546 |
|
|
else {
|
| 547 |
|
|
sprintf(SDerrorDetail,
|
| 548 |
|
|
"BSDF \"%s\": unsupported IncidentDataStructure",
|
| 549 |
|
|
sd->name);
|
| 550 |
|
|
return SDEsupport;
|
| 551 |
|
|
}
|
| 552 |
|
|
/* get angle basis */
|
| 553 |
|
|
rval = load_angle_basis(ezxml_child(ezxml_child(wtl,
|
| 554 |
|
|
"DataDefinition"), "AngleBasis"));
|
| 555 |
|
|
if (rval < 0)
|
| 556 |
greg |
3.4 |
return convert_errcode(rval);
|
| 557 |
greg |
3.1 |
/* load BSDF components */
|
| 558 |
|
|
for (wld = ezxml_child(wtl, "WavelengthData");
|
| 559 |
|
|
wld != NULL; wld = wld->next) {
|
| 560 |
|
|
if (strcasecmp(ezxml_txt(ezxml_child(wld,"Wavelength")),
|
| 561 |
|
|
"Visible"))
|
| 562 |
|
|
continue; /* just visible for now */
|
| 563 |
|
|
for (wdb = ezxml_child(wld, "WavelengthDataBlock");
|
| 564 |
|
|
wdb != NULL; wdb = wdb->next)
|
| 565 |
|
|
if ((rval = load_bsdf_data(sd, wdb, rowIn)) < 0)
|
| 566 |
greg |
3.4 |
return convert_errcode(rval);
|
| 567 |
greg |
3.1 |
}
|
| 568 |
|
|
/* separate diffuse components */
|
| 569 |
|
|
extract_diffuse(&sd->rLambFront, sd->rf);
|
| 570 |
|
|
extract_diffuse(&sd->rLambBack, sd->rb);
|
| 571 |
|
|
extract_diffuse(&sd->tLamb, sd->tf);
|
| 572 |
|
|
/* return success */
|
| 573 |
|
|
return SDEnone;
|
| 574 |
|
|
}
|
| 575 |
|
|
|
| 576 |
|
|
/* Get Matrix BSDF value */
|
| 577 |
|
|
static int
|
| 578 |
|
|
SDgetMtxBSDF(float coef[SDmaxCh], const FVECT outVec,
|
| 579 |
|
|
const FVECT inVec, const void *dist)
|
| 580 |
|
|
{
|
| 581 |
|
|
const SDMat *dp = (const SDMat *)dist;
|
| 582 |
|
|
int i_ndx, o_ndx;
|
| 583 |
|
|
/* get angle indices */
|
| 584 |
|
|
i_ndx = mBSDF_incndx(dp, inVec);
|
| 585 |
|
|
o_ndx = mBSDF_outndx(dp, outVec);
|
| 586 |
|
|
/* try reciprocity if necessary */
|
| 587 |
|
|
if ((i_ndx < 0) & (o_ndx < 0)) {
|
| 588 |
|
|
i_ndx = mBSDF_incndx(dp, outVec);
|
| 589 |
|
|
o_ndx = mBSDF_outndx(dp, inVec);
|
| 590 |
|
|
}
|
| 591 |
|
|
if ((i_ndx < 0) | (o_ndx < 0))
|
| 592 |
|
|
return 0; /* nothing from this component */
|
| 593 |
|
|
coef[0] = mBSDF_value(dp, i_ndx, o_ndx);
|
| 594 |
|
|
return 1; /* XXX monochrome for now */
|
| 595 |
|
|
}
|
| 596 |
|
|
|
| 597 |
|
|
/* Query solid angle for vector */
|
| 598 |
|
|
static SDError
|
| 599 |
|
|
SDqueryMtxProjSA(double *psa, const FVECT vec, int qflags, const void *dist)
|
| 600 |
|
|
{
|
| 601 |
|
|
const SDMat *dp = (const SDMat *)dist;
|
| 602 |
greg |
3.5 |
double inc_psa, out_psa;
|
| 603 |
|
|
/* check arguments */
|
| 604 |
|
|
if ((psa == NULL) | (vec == NULL) | (dp == NULL))
|
| 605 |
greg |
3.1 |
return SDEargument;
|
| 606 |
greg |
3.5 |
/* get projected solid angles */
|
| 607 |
|
|
inc_psa = mBSDF_incohm(dp, mBSDF_incndx(dp, vec));
|
| 608 |
|
|
out_psa = mBSDF_outohm(dp, mBSDF_outndx(dp, vec));
|
| 609 |
|
|
|
| 610 |
|
|
switch (qflags) { /* record based on flag settings */
|
| 611 |
|
|
case SDqueryVal:
|
| 612 |
|
|
psa[0] = .0;
|
| 613 |
|
|
/* fall through */
|
| 614 |
|
|
case SDqueryMax:
|
| 615 |
|
|
if (inc_psa > psa[0])
|
| 616 |
|
|
psa[0] = inc_psa;
|
| 617 |
|
|
if (out_psa > psa[0])
|
| 618 |
|
|
psa[0] = out_psa;
|
| 619 |
|
|
break;
|
| 620 |
|
|
case SDqueryMin+SDqueryMax:
|
| 621 |
|
|
if (inc_psa > psa[0])
|
| 622 |
|
|
psa[1] = inc_psa;
|
| 623 |
|
|
if (out_psa > psa[0])
|
| 624 |
|
|
psa[1] = out_psa;
|
| 625 |
|
|
/* fall through */
|
| 626 |
|
|
case SDqueryMin:
|
| 627 |
|
|
if ((inc_psa > .0) & (inc_psa < psa[0]))
|
| 628 |
greg |
3.1 |
psa[0] = inc_psa;
|
| 629 |
greg |
3.5 |
if ((out_psa > .0) & (out_psa < psa[0]))
|
| 630 |
|
|
psa[0] = out_psa;
|
| 631 |
|
|
break;
|
| 632 |
greg |
3.1 |
}
|
| 633 |
greg |
3.5 |
/* make sure it's legal */
|
| 634 |
|
|
return (psa[0] <= .0) ? SDEinternal : SDEnone;
|
| 635 |
greg |
3.1 |
}
|
| 636 |
|
|
|
| 637 |
|
|
/* Compute new cumulative distribution from BSDF */
|
| 638 |
|
|
static int
|
| 639 |
|
|
make_cdist(SDMatCDst *cd, const FVECT inVec, SDMat *dp, int rev)
|
| 640 |
|
|
{
|
| 641 |
|
|
const unsigned maxval = ~0;
|
| 642 |
|
|
double *cmtab, scale;
|
| 643 |
|
|
int o;
|
| 644 |
|
|
|
| 645 |
|
|
cmtab = (double *)malloc((cd->calen+1)*sizeof(double));
|
| 646 |
|
|
if (cmtab == NULL)
|
| 647 |
|
|
return 0;
|
| 648 |
|
|
cmtab[0] = .0;
|
| 649 |
|
|
for (o = 0; o < cd->calen; o++) {
|
| 650 |
|
|
if (rev)
|
| 651 |
|
|
cmtab[o+1] = mBSDF_value(dp, o, cd->indx) *
|
| 652 |
|
|
(*dp->ib_ohm)(o, dp->ib_priv);
|
| 653 |
|
|
else
|
| 654 |
|
|
cmtab[o+1] = mBSDF_value(dp, cd->indx, o) *
|
| 655 |
|
|
(*dp->ob_ohm)(o, dp->ob_priv);
|
| 656 |
|
|
cmtab[o+1] += cmtab[o];
|
| 657 |
|
|
}
|
| 658 |
|
|
cd->cTotal = cmtab[cd->calen];
|
| 659 |
|
|
scale = (double)maxval / cd->cTotal;
|
| 660 |
|
|
cd->carr[0] = 0;
|
| 661 |
|
|
for (o = 1; o < cd->calen; o++)
|
| 662 |
|
|
cd->carr[o] = scale*cmtab[o] + .5;
|
| 663 |
|
|
cd->carr[cd->calen] = maxval;
|
| 664 |
|
|
free(cmtab);
|
| 665 |
|
|
return 1;
|
| 666 |
|
|
}
|
| 667 |
|
|
|
| 668 |
|
|
/* Get cumulative distribution for matrix BSDF */
|
| 669 |
|
|
static const SDCDst *
|
| 670 |
|
|
SDgetMtxCDist(const FVECT inVec, SDComponent *sdc)
|
| 671 |
|
|
{
|
| 672 |
|
|
SDMat *dp = (SDMat *)sdc->dist;
|
| 673 |
|
|
int reverse;
|
| 674 |
|
|
SDMatCDst myCD;
|
| 675 |
|
|
SDMatCDst *cd, *cdlast;
|
| 676 |
greg |
3.5 |
/* check arguments */
|
| 677 |
|
|
if ((inVec == NULL) | (dp == NULL))
|
| 678 |
greg |
3.1 |
return NULL;
|
| 679 |
|
|
memset(&myCD, 0, sizeof(myCD));
|
| 680 |
|
|
myCD.indx = mBSDF_incndx(dp, inVec);
|
| 681 |
|
|
if (myCD.indx >= 0) {
|
| 682 |
|
|
myCD.ob_priv = dp->ob_priv;
|
| 683 |
|
|
myCD.ob_vec = dp->ob_vec;
|
| 684 |
|
|
myCD.calen = dp->nout;
|
| 685 |
|
|
reverse = 0;
|
| 686 |
|
|
} else { /* try reciprocity */
|
| 687 |
|
|
myCD.indx = mBSDF_outndx(dp, inVec);
|
| 688 |
|
|
if (myCD.indx < 0)
|
| 689 |
|
|
return NULL;
|
| 690 |
|
|
myCD.ob_priv = dp->ib_priv;
|
| 691 |
|
|
myCD.ob_vec = dp->ib_vec;
|
| 692 |
|
|
myCD.calen = dp->ninc;
|
| 693 |
|
|
reverse = 1;
|
| 694 |
|
|
}
|
| 695 |
|
|
cdlast = NULL; /* check for it in cache list */
|
| 696 |
|
|
for (cd = (SDMatCDst *)sdc->cdList;
|
| 697 |
|
|
cd != NULL; cd = (SDMatCDst *)cd->next) {
|
| 698 |
|
|
if (cd->indx == myCD.indx && (cd->calen == myCD.calen) &
|
| 699 |
|
|
(cd->ob_priv == myCD.ob_priv) &
|
| 700 |
|
|
(cd->ob_vec == myCD.ob_vec))
|
| 701 |
|
|
break;
|
| 702 |
|
|
cdlast = cd;
|
| 703 |
|
|
}
|
| 704 |
|
|
if (cd == NULL) { /* need to allocate new entry */
|
| 705 |
|
|
cd = (SDMatCDst *)malloc(sizeof(SDMatCDst) +
|
| 706 |
|
|
myCD.calen*sizeof(myCD.carr[0]));
|
| 707 |
|
|
if (cd == NULL)
|
| 708 |
|
|
return NULL;
|
| 709 |
|
|
*cd = myCD; /* compute cumulative distribution */
|
| 710 |
|
|
if (!make_cdist(cd, inVec, dp, reverse)) {
|
| 711 |
|
|
free(cd);
|
| 712 |
|
|
return NULL;
|
| 713 |
|
|
}
|
| 714 |
|
|
cdlast = cd;
|
| 715 |
|
|
}
|
| 716 |
|
|
if (cdlast != NULL) { /* move entry to head of cache list */
|
| 717 |
|
|
cdlast->next = cd->next;
|
| 718 |
|
|
cd->next = sdc->cdList;
|
| 719 |
|
|
sdc->cdList = (SDCDst *)cd;
|
| 720 |
|
|
}
|
| 721 |
|
|
return (SDCDst *)cd; /* ready to go */
|
| 722 |
|
|
}
|
| 723 |
|
|
|
| 724 |
|
|
/* Sample cumulative distribution */
|
| 725 |
|
|
static SDError
|
| 726 |
|
|
SDsampMtxCDist(FVECT outVec, double randX, const SDCDst *cdp)
|
| 727 |
|
|
{
|
| 728 |
|
|
const unsigned maxval = ~0;
|
| 729 |
|
|
const SDMatCDst *mcd = (const SDMatCDst *)cdp;
|
| 730 |
|
|
const unsigned target = randX*maxval;
|
| 731 |
|
|
int i, iupper, ilower;
|
| 732 |
greg |
3.5 |
/* check arguments */
|
| 733 |
|
|
if ((outVec == NULL) | (mcd == NULL))
|
| 734 |
|
|
return SDEargument;
|
| 735 |
greg |
3.1 |
/* binary search to find index */
|
| 736 |
|
|
ilower = 0; iupper = mcd->calen;
|
| 737 |
|
|
while ((i = (iupper + ilower) >> 1) != ilower)
|
| 738 |
|
|
if ((long)target >= (long)mcd->carr[i])
|
| 739 |
|
|
ilower = i;
|
| 740 |
|
|
else
|
| 741 |
|
|
iupper = i;
|
| 742 |
|
|
/* localize random position */
|
| 743 |
|
|
randX = (randX*maxval - mcd->carr[ilower]) /
|
| 744 |
|
|
(double)(mcd->carr[iupper] - mcd->carr[ilower]);
|
| 745 |
|
|
/* convert index to vector */
|
| 746 |
|
|
if ((*mcd->ob_vec)(outVec, i, randX, mcd->ob_priv))
|
| 747 |
|
|
return SDEnone;
|
| 748 |
|
|
strcpy(SDerrorDetail, "BSDF sampling fault");
|
| 749 |
|
|
return SDEinternal;
|
| 750 |
|
|
}
|
| 751 |
|
|
|
| 752 |
|
|
/* Fixed resolution BSDF methods */
|
| 753 |
|
|
SDFunc SDhandleMtx = {
|
| 754 |
|
|
&SDgetMtxBSDF,
|
| 755 |
|
|
&SDqueryMtxProjSA,
|
| 756 |
|
|
&SDgetMtxCDist,
|
| 757 |
|
|
&SDsampMtxCDist,
|
| 758 |
|
|
&SDfreeMatrix,
|
| 759 |
|
|
};
|
