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#ifndef lint
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static const char RCSid[] = "$Id: bsdfquery.c,v 2.3 2014/04/11 20:27:23 greg Exp $";
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#endif
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/*
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* Query values from the given BSDF (scattering interpolant or XML repres.)
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* Input query is incident and exiting vectors directed away from surface.
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* We normalize. Output is a BSDF value for the vector pair.
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* It is wise to sort the input directions to keep identical ones together
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* when using a scattering interpolant representation.
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*/
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#define _USE_MATH_DEFINES
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include "rtmath.h"
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#include "bsdfrep.h"
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char *progname;
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/* Read in a vector pair */
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static int
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readIOdir(FVECT idir, FVECT odir, FILE *fp, int fmt)
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{
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double dvec[6];
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float fvec[6];
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switch (fmt) {
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case 'a':
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if (fscanf(fp, FVFORMAT, dvec, dvec+1, dvec+2) != 3 ||
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fscanf(fp, FVFORMAT, dvec+3, dvec+4, dvec+5) != 3)
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return(0);
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VCOPY(idir, dvec);
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VCOPY(odir, dvec+3);
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break;
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case 'd':
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if (fread(dvec, sizeof(double), 6, fp) != 6)
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return(0);
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VCOPY(idir, dvec);
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VCOPY(odir, dvec+3);
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break;
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case 'f':
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if (fread(fvec, sizeof(float), 6, fp) != 6)
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return(0);
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VCOPY(idir, fvec);
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VCOPY(odir, fvec+3);
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break;
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}
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if ((normalize(idir) == 0) | (normalize(odir) == 0)) {
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fprintf(stderr, "%s: zero input vector!\n", progname);
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return(0);
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}
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return(1);
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}
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/* Get BSDF values for the input and output directions given on stdin */
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int
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main(int argc, char *argv[])
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{
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int inpXML = -1;
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int inpfmt = 'a';
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int outfmt = 'a';
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RBFNODE *rbf = NULL;
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int32 prevInpDir = 0;
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SDData myBSDF;
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FVECT idir, odir;
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int n;
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/* check arguments */
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progname = argv[0];
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if (argc > 2 && argv[1][0] == '-' && argv[1][1] == 'f' &&
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argv[1][2] && strchr("afd", argv[1][2]) != NULL) {
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inpfmt = outfmt = argv[1][2];
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if (argv[1][3] && strchr("afd", argv[1][3]) != NULL)
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outfmt = argv[1][3];
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++argv; --argc;
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}
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if (argc > 1 && (n = strlen(argv[1])-4) > 0) {
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if (!strcasecmp(argv[1]+n, ".xml"))
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inpXML = 1;
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else if (!strcasecmp(argv[1]+n, ".sir"))
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inpXML = 0;
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}
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if ((argc != 2) | (inpXML < 0)) {
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fprintf(stderr, "Usage: %s [-fio] bsdf.{sir|xml}\n", progname);
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return(1);
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}
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/* load BSDF representation */
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if (inpXML) {
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SDclearBSDF(&myBSDF, argv[1]);
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if (SDreportError(SDloadFile(&myBSDF, argv[1]), stderr))
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return(1);
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} else {
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FILE *fp = fopen(argv[1], "rb");
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if (fp == NULL) {
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fprintf(stderr, "%s: cannot open BSDF interpolant '%s'\n",
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progname, argv[1]);
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return(1);
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}
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if (!load_bsdf_rep(fp))
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return(1);
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fclose(fp);
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}
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/* query BSDF values */
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while (readIOdir(idir, odir, stdin, inpfmt)) {
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double bsdf;
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float fval;
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if (inpXML) {
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SDValue sval;
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if (SDreportError(SDevalBSDF(&sval, odir,
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idir, &myBSDF), stderr))
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return(1);
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bsdf = sval.cieY;
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} else {
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int32 inpDir = encodedir(idir);
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if (inpDir != prevInpDir) {
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if (idir[2] > 0 ^ input_orient > 0) {
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fprintf(stderr, "%s: input hemisphere error\n",
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progname);
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return(1);
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}
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if (rbf != NULL) free(rbf);
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rbf = advect_rbf(idir, 15000);
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prevInpDir = inpDir;
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}
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if (odir[2] > 0 ^ output_orient > 0) {
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fprintf(stderr, "%s: output hemisphere error\n",
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progname);
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return(1);
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}
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bsdf = eval_rbfrep(rbf, odir);
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}
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switch (outfmt) { /* write to stdout */
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case 'a':
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printf("%.6e\n", bsdf);
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break;
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case 'd':
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fwrite(&bsdf, sizeof(double), 1, stdout);
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break;
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case 'f':
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fval = bsdf;
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fwrite(&fval, sizeof(float), 1, stdout);
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break;
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}
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}
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return(0);
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}
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