| 1 |
#ifndef lint |
| 2 |
static const char RCSid[] = "$Id: bsdfquery.c,v 2.3 2014/04/11 20:27:23 greg Exp $"; |
| 3 |
#endif |
| 4 |
/* |
| 5 |
* Query values from the given BSDF (scattering interpolant or XML repres.) |
| 6 |
* Input query is incident and exiting vectors directed away from surface. |
| 7 |
* We normalize. Output is a BSDF value for the vector pair. |
| 8 |
* It is wise to sort the input directions to keep identical ones together |
| 9 |
* when using a scattering interpolant representation. |
| 10 |
*/ |
| 11 |
|
| 12 |
#define _USE_MATH_DEFINES |
| 13 |
#include <stdio.h> |
| 14 |
#include <string.h> |
| 15 |
#include <stdlib.h> |
| 16 |
#include "rtmath.h" |
| 17 |
#include "bsdfrep.h" |
| 18 |
|
| 19 |
char *progname; |
| 20 |
|
| 21 |
/* Read in a vector pair */ |
| 22 |
static int |
| 23 |
readIOdir(FVECT idir, FVECT odir, FILE *fp, int fmt) |
| 24 |
{ |
| 25 |
double dvec[6]; |
| 26 |
float fvec[6]; |
| 27 |
|
| 28 |
switch (fmt) { |
| 29 |
case 'a': |
| 30 |
if (fscanf(fp, FVFORMAT, dvec, dvec+1, dvec+2) != 3 || |
| 31 |
fscanf(fp, FVFORMAT, dvec+3, dvec+4, dvec+5) != 3) |
| 32 |
return(0); |
| 33 |
VCOPY(idir, dvec); |
| 34 |
VCOPY(odir, dvec+3); |
| 35 |
break; |
| 36 |
case 'd': |
| 37 |
if (fread(dvec, sizeof(double), 6, fp) != 6) |
| 38 |
return(0); |
| 39 |
VCOPY(idir, dvec); |
| 40 |
VCOPY(odir, dvec+3); |
| 41 |
break; |
| 42 |
case 'f': |
| 43 |
if (fread(fvec, sizeof(float), 6, fp) != 6) |
| 44 |
return(0); |
| 45 |
VCOPY(idir, fvec); |
| 46 |
VCOPY(odir, fvec+3); |
| 47 |
break; |
| 48 |
} |
| 49 |
if ((normalize(idir) == 0) | (normalize(odir) == 0)) { |
| 50 |
fprintf(stderr, "%s: zero input vector!\n", progname); |
| 51 |
return(0); |
| 52 |
} |
| 53 |
return(1); |
| 54 |
} |
| 55 |
|
| 56 |
/* Get BSDF values for the input and output directions given on stdin */ |
| 57 |
int |
| 58 |
main(int argc, char *argv[]) |
| 59 |
{ |
| 60 |
int inpXML = -1; |
| 61 |
int inpfmt = 'a'; |
| 62 |
int outfmt = 'a'; |
| 63 |
RBFNODE *rbf = NULL; |
| 64 |
int32 prevInpDir = 0; |
| 65 |
SDData myBSDF; |
| 66 |
FVECT idir, odir; |
| 67 |
int n; |
| 68 |
/* check arguments */ |
| 69 |
progname = argv[0]; |
| 70 |
if (argc > 2 && argv[1][0] == '-' && argv[1][1] == 'f' && |
| 71 |
argv[1][2] && strchr("afd", argv[1][2]) != NULL) { |
| 72 |
inpfmt = outfmt = argv[1][2]; |
| 73 |
if (argv[1][3] && strchr("afd", argv[1][3]) != NULL) |
| 74 |
outfmt = argv[1][3]; |
| 75 |
++argv; --argc; |
| 76 |
} |
| 77 |
if (argc > 1 && (n = strlen(argv[1])-4) > 0) { |
| 78 |
if (!strcasecmp(argv[1]+n, ".xml")) |
| 79 |
inpXML = 1; |
| 80 |
else if (!strcasecmp(argv[1]+n, ".sir")) |
| 81 |
inpXML = 0; |
| 82 |
} |
| 83 |
if ((argc != 2) | (inpXML < 0)) { |
| 84 |
fprintf(stderr, "Usage: %s [-fio] bsdf.{sir|xml}\n", progname); |
| 85 |
return(1); |
| 86 |
} |
| 87 |
/* load BSDF representation */ |
| 88 |
if (inpXML) { |
| 89 |
SDclearBSDF(&myBSDF, argv[1]); |
| 90 |
if (SDreportError(SDloadFile(&myBSDF, argv[1]), stderr)) |
| 91 |
return(1); |
| 92 |
} else { |
| 93 |
FILE *fp = fopen(argv[1], "rb"); |
| 94 |
if (fp == NULL) { |
| 95 |
fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n", |
| 96 |
progname, argv[1]); |
| 97 |
return(1); |
| 98 |
} |
| 99 |
if (!load_bsdf_rep(fp)) |
| 100 |
return(1); |
| 101 |
fclose(fp); |
| 102 |
} |
| 103 |
/* query BSDF values */ |
| 104 |
while (readIOdir(idir, odir, stdin, inpfmt)) { |
| 105 |
double bsdf; |
| 106 |
float fval; |
| 107 |
if (inpXML) { |
| 108 |
SDValue sval; |
| 109 |
if (SDreportError(SDevalBSDF(&sval, odir, |
| 110 |
idir, &myBSDF), stderr)) |
| 111 |
return(1); |
| 112 |
bsdf = sval.cieY; |
| 113 |
} else { |
| 114 |
int32 inpDir = encodedir(idir); |
| 115 |
if (inpDir != prevInpDir) { |
| 116 |
if (idir[2] > 0 ^ input_orient > 0) { |
| 117 |
fprintf(stderr, "%s: input hemisphere error\n", |
| 118 |
progname); |
| 119 |
return(1); |
| 120 |
} |
| 121 |
if (rbf != NULL) free(rbf); |
| 122 |
rbf = advect_rbf(idir, 15000); |
| 123 |
prevInpDir = inpDir; |
| 124 |
} |
| 125 |
if (odir[2] > 0 ^ output_orient > 0) { |
| 126 |
fprintf(stderr, "%s: output hemisphere error\n", |
| 127 |
progname); |
| 128 |
return(1); |
| 129 |
} |
| 130 |
bsdf = eval_rbfrep(rbf, odir); |
| 131 |
} |
| 132 |
switch (outfmt) { /* write to stdout */ |
| 133 |
case 'a': |
| 134 |
printf("%.6e\n", bsdf); |
| 135 |
break; |
| 136 |
case 'd': |
| 137 |
fwrite(&bsdf, sizeof(double), 1, stdout); |
| 138 |
break; |
| 139 |
case 'f': |
| 140 |
fval = bsdf; |
| 141 |
fwrite(&fval, sizeof(float), 1, stdout); |
| 142 |
break; |
| 143 |
} |
| 144 |
} |
| 145 |
return(0); |
| 146 |
} |
