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greg |
2.1 |
#ifndef lint |
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static const char RCSid[] = "$Id: pabopto2bsdf.c,v 2.29 2016/02/02 00:42:11 greg Exp $"; |
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#endif |
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/* |
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* Combine PAB-Opto data files for color (CIE-XYZ) interpolation. |
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* |
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* G. Ward |
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*/ |
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#define _USE_MATH_DEFINES |
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#include "rtio.h" |
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#include <stdlib.h> |
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#include <ctype.h> |
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#include <math.h> |
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#include "interp2d.h" |
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/* #define DEBUG 1 */ |
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#ifndef MAX_INPUTS |
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#define MAX_INPUTS 512 /* can handle this many files per chan */ |
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#endif |
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#define ANGRES 256 /* resolution per 180 degrees */ |
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/* Input file header information */ |
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typedef struct { |
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const char *fname; /* input file path */ |
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double theta, phi; /* input angles (degrees) */ |
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double up_phi; /* azimuth for "up" direction */ |
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int igp[2]; /* input grid position */ |
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int isDSF; /* data is DSF (rather than BSDF)? */ |
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int ndata; /* number of data points (or 0) */ |
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long dstart; /* data start offset in file */ |
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} PGINPUT; |
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/* 2-D interpolant for a particular incident direction */ |
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typedef struct { |
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INTERP2 *ip2; /* 2-D interpolatiing function */ |
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float *va; /* corresponding value array */ |
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} PGINTERP; |
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extern void SDdisk2square(double sq[2], double diskx, double disky); |
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char *progname; /* global argv[0] */ |
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int nprocs = 1; /* number of processes to run */ |
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int nchild = 0; /* number of children (-1 in child) */ |
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char *basename = "pabopto_xyz"; |
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/* color conversion matrix */ |
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double sens2xyz[3][3] = { |
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8.7539e-01, 3.5402e-02, 9.0381e-02, |
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1.3463e+00, -3.9082e-01, 7.2721e-02, |
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2.7306e-01, -2.1111e-01, 1.1014e+00, |
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}; |
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#if defined(_WIN32) || defined(_WIN64) |
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#define await_children(n) (void)(n) |
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#define run_subprocess() 0 |
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#define end_subprocess() (void)0 |
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#else /* ! _WIN32 */ |
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#include <unistd.h> |
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#include <sys/wait.h> |
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/* Wait for the specified number of child processes to complete */ |
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static void |
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await_children(int n) |
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{ |
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int exit_status = 0; |
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if (n > nchild) |
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n = nchild; |
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while (n-- > 0) { |
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int status; |
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if (wait(&status) < 0) { |
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fprintf(stderr, "%s: missing child(ren)!\n", progname); |
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nchild = 0; |
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break; |
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} |
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--nchild; |
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if (status) { /* something wrong */ |
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if ((status = WEXITSTATUS(status))) |
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exit_status = status; |
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else |
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exit_status += !exit_status; |
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fprintf(stderr, "%s: subprocess died\n", progname); |
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n = nchild; /* wait for the rest */ |
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} |
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} |
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if (exit_status) |
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exit(exit_status); |
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} |
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/* Start child process if multiprocessing selected */ |
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static pid_t |
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run_subprocess(void) |
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{ |
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int status; |
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pid_t pid; |
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if (nprocs <= 1) /* any children requested? */ |
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return(0); |
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await_children(nchild + 1 - nprocs); /* free up child process */ |
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if ((pid = fork())) { |
| 110 |
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if (pid < 0) { |
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fprintf(stderr, "%s: cannot fork subprocess\n", |
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progname); |
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await_children(nchild); |
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exit(1); |
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} |
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++nchild; /* subprocess started */ |
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return(pid); |
| 118 |
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} |
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nchild = -1; |
| 120 |
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return(0); /* put child to work */ |
| 121 |
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} |
| 122 |
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| 123 |
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/* If we are in subprocess, call exit */ |
| 124 |
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#define end_subprocess() if (nchild < 0) _exit(0); else |
| 125 |
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| 126 |
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#endif /* ! _WIN32 */ |
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| 128 |
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/* Compute square location from normalized input/output vector */ |
| 129 |
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static void |
| 130 |
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sq_from_ang(double sq[2], double theta, double phi) |
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{ |
| 132 |
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double vec[3]; |
| 133 |
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double norm; |
| 134 |
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/* uniform hemispherical projection */ |
| 135 |
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vec[2] = sin(M_PI/180.*theta); |
| 136 |
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vec[0] = cos(M_PI/180.*phi)*vec[2]; |
| 137 |
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vec[1] = sin(M_PI/180.*phi)*vec[2]; |
| 138 |
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vec[2] = sqrt(1. - vec[2]*vec[2]); |
| 139 |
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norm = 1./sqrt(1. + vec[2]); |
| 140 |
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| 141 |
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SDdisk2square(sq, vec[0]*norm, vec[1]*norm); |
| 142 |
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} |
| 143 |
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| 144 |
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/* Compute quantized grid position from normalized input/output vector */ |
| 145 |
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static void |
| 146 |
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pos_from_ang(int gp[2], double theta, double phi) |
| 147 |
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{ |
| 148 |
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double sq[2]; |
| 149 |
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| 150 |
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sq_from_ang(sq, theta, phi); |
| 151 |
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gp[0] = (int)(sq[0]*ANGRES); |
| 152 |
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gp[1] = (int)(sq[1]*ANGRES); |
| 153 |
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} |
| 154 |
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| 155 |
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/* Compare incident angles */ |
| 156 |
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static int |
| 157 |
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cmp_indir(const void *p1, const void *p2) |
| 158 |
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{ |
| 159 |
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const PGINPUT *inp1 = (const PGINPUT *)p1; |
| 160 |
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const PGINPUT *inp2 = (const PGINPUT *)p2; |
| 161 |
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int ydif; |
| 162 |
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| 163 |
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if (!inp1->dstart) /* put terminator last */ |
| 164 |
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return(inp2->dstart > 0); |
| 165 |
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if (!inp2->dstart) |
| 166 |
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return(-1); |
| 167 |
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| 168 |
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ydif = inp1->igp[1] - inp2->igp[1]; |
| 169 |
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if (ydif) |
| 170 |
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return(ydif); |
| 171 |
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| 172 |
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return(inp1->igp[0] - inp2->igp[0]); |
| 173 |
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} |
| 174 |
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| 175 |
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/* Prepare a PAB-Opto input file by reading its header */ |
| 176 |
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static int |
| 177 |
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init_pabopto_inp(PGINPUT *pgi, const char *fname) |
| 178 |
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{ |
| 179 |
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FILE *fp = fopen(fname, "r"); |
| 180 |
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char buf[2048]; |
| 181 |
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int c; |
| 182 |
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| 183 |
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if (fp == NULL) { |
| 184 |
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fputs(fname, stderr); |
| 185 |
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fputs(": cannot open\n", stderr); |
| 186 |
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return(0); |
| 187 |
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} |
| 188 |
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pgi->fname = fname; |
| 189 |
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pgi->isDSF = -1; |
| 190 |
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pgi->ndata = 0; |
| 191 |
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pgi->up_phi = 0; |
| 192 |
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pgi->theta = pgi->phi = -10001.; |
| 193 |
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/* read header information */ |
| 194 |
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while ((c = getc(fp)) == '#' || c == EOF) { |
| 195 |
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char typ[64]; |
| 196 |
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if (fgets(buf, sizeof(buf), fp) == NULL) { |
| 197 |
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fputs(fname, stderr); |
| 198 |
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fputs(": unexpected EOF\n", stderr); |
| 199 |
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fclose(fp); |
| 200 |
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return(0); |
| 201 |
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} |
| 202 |
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if (sscanf(buf, "colorimetry: %s", typ) == 1) { |
| 203 |
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if (!strcasecmp(typ, "CIE-XYZ")) { |
| 204 |
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fputs(fname, stderr); |
| 205 |
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fputs(": already in XYZ color space!\n", stderr); |
| 206 |
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return(0); |
| 207 |
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} |
| 208 |
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continue; |
| 209 |
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} |
| 210 |
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if (sscanf(buf, "datapoints_in_file:%d", &pgi->ndata) == 1) |
| 211 |
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continue; |
| 212 |
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if (sscanf(buf, "format: theta phi %s", typ) == 1) { |
| 213 |
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if (!strcasecmp(typ, "DSF")) |
| 214 |
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pgi->isDSF = 1; |
| 215 |
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else if (!strcasecmp(typ, "BSDF") || |
| 216 |
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!strcasecmp(typ, "BRDF") || |
| 217 |
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!strcasecmp(typ, "BTDF")) |
| 218 |
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pgi->isDSF = 0; |
| 219 |
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continue; |
| 220 |
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} |
| 221 |
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if (sscanf(buf, "upphi %lf", &pgi->up_phi) == 1) |
| 222 |
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continue; |
| 223 |
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if (sscanf(buf, "intheta %lf", &pgi->theta) == 1) |
| 224 |
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continue; |
| 225 |
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if (sscanf(buf, "inphi %lf", &pgi->phi) == 1) |
| 226 |
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continue; |
| 227 |
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if (sscanf(buf, "incident_angle %lf %lf", |
| 228 |
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&pgi->theta, &pgi->phi) == 2) |
| 229 |
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continue; |
| 230 |
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} |
| 231 |
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pgi->dstart = ftell(fp) - 1; |
| 232 |
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fclose(fp); |
| 233 |
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if (pgi->isDSF < 0) { |
| 234 |
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fputs(fname, stderr); |
| 235 |
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fputs(": unknown format\n", stderr); |
| 236 |
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return(0); |
| 237 |
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} |
| 238 |
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if ((pgi->theta < -10000.) | (pgi->phi < -10000.)) { |
| 239 |
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fputs(fname, stderr); |
| 240 |
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fputs(": unknown incident angle\n", stderr); |
| 241 |
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return(0); |
| 242 |
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} |
| 243 |
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/* convert angle to grid position */ |
| 244 |
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pos_from_ang(pgi->igp, pgi->theta, pgi->phi); |
| 245 |
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return(1); |
| 246 |
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} |
| 247 |
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| 248 |
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/* Load interpolating function for a particular incident direction */ |
| 249 |
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static int |
| 250 |
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load_interp(PGINTERP *pgint, const int igp[2], const PGINPUT *pginp) |
| 251 |
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{ |
| 252 |
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int nv = 0; |
| 253 |
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int nread = 0; |
| 254 |
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pgint->ip2 = NULL; |
| 255 |
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pgint->va = NULL; |
| 256 |
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/* load input file(s) */ |
| 257 |
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while (pginp->dstart && (pginp->igp[0] == igp[0]) & |
| 258 |
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(pginp->igp[1] == igp[1])) { |
| 259 |
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FILE *fp = fopen(pginp->fname, "r"); |
| 260 |
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double theta, phi; |
| 261 |
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float val; |
| 262 |
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| 263 |
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if (fp == NULL || fseek(fp, pginp->dstart, SEEK_SET) < 0) { |
| 264 |
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fputs(pginp->fname, stderr); |
| 265 |
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fputs(": cannot re-open input file!\n", stderr); |
| 266 |
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return(0); |
| 267 |
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} |
| 268 |
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#ifdef DEBUG |
| 269 |
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fprintf(stderr, "Loading channel from '%s'\n", pginp->fname); |
| 270 |
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#endif |
| 271 |
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while (fscanf(fp, "%lf %lf %f", &theta, &phi, &val) == 3) { |
| 272 |
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double sq[2]; |
| 273 |
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if (nread >= nv) { |
| 274 |
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if (pginp->ndata > 0) |
| 275 |
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nv += pginp->ndata; |
| 276 |
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else |
| 277 |
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nv += (nv>>1) + 1024; |
| 278 |
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pgint->ip2 = interp2_realloc(pgint->ip2, nv); |
| 279 |
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pgint->va = (float *)realloc(pgint->va, sizeof(float)*nv); |
| 280 |
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if ((pgint->ip2 == NULL) | (pgint->va == NULL)) |
| 281 |
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goto memerr; |
| 282 |
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} |
| 283 |
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sq_from_ang(sq, theta, phi); |
| 284 |
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pgint->ip2->spt[nread][0] = sq[0]*ANGRES; |
| 285 |
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pgint->ip2->spt[nread][1] = sq[1]*ANGRES; |
| 286 |
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pgint->va[nread++] = val; |
| 287 |
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} |
| 288 |
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fclose(fp); |
| 289 |
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++pginp; /* advance to next input */ |
| 290 |
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} |
| 291 |
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if (nv > nread) { /* fix array sizes */ |
| 292 |
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pgint->ip2 = interp2_realloc(pgint->ip2, nread); |
| 293 |
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pgint->va = (float *)realloc(pgint->va, nread); |
| 294 |
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if ((pgint->ip2 == NULL) | (pgint->va == NULL)) |
| 295 |
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goto memerr; |
| 296 |
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} |
| 297 |
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return(1); |
| 298 |
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memerr: |
| 299 |
|
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fputs(progname, stderr); |
| 300 |
|
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fputs(": Out of memory in load_interp()!\n", stderr); |
| 301 |
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return(0); |
| 302 |
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} |
| 303 |
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| 304 |
|
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/* Interpolate value at the given position */ |
| 305 |
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static double |
| 306 |
|
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interp2val(const PGINTERP *pgint, double px, double py) |
| 307 |
|
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{ |
| 308 |
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#define NSMP 12 |
| 309 |
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float wt[NSMP]; |
| 310 |
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int si[NSMP]; |
| 311 |
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int n = interp2_topsamp(wt, si, NSMP, pgint->ip2, px, py); |
| 312 |
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double v = .0; |
| 313 |
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| 314 |
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while (n-- > 0) |
| 315 |
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v += wt[n]*pgint->va[si[n]]; |
| 316 |
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| 317 |
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return(v); |
| 318 |
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#undef NSMP |
| 319 |
|
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} |
| 320 |
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|
| 321 |
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static void |
| 322 |
|
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free_interp(PGINTERP *pgint) |
| 323 |
|
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{ |
| 324 |
|
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interp2_free(pgint->ip2); |
| 325 |
|
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pgint->ip2 = NULL; |
| 326 |
|
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free(pgint->va); |
| 327 |
|
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pgint->va = NULL; |
| 328 |
|
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} |
| 329 |
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| 330 |
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/* Interpolate the given incident direction to an output file */ |
| 331 |
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static int |
| 332 |
|
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interp_xyz(const PGINPUT *inp0, int nf, const PGINTERP *int1, const PGINTERP *int2) |
| 333 |
|
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{ |
| 334 |
|
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int dtotal = 0; |
| 335 |
|
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char outfname[256]; |
| 336 |
|
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FILE *ofp; |
| 337 |
|
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int i; |
| 338 |
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| 339 |
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if (nf <= 0) |
| 340 |
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return(0); |
| 341 |
|
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/* create output file & write header */ |
| 342 |
|
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sprintf(outfname, "%s_t%03.0fp%03.0f.txt", basename, inp0->theta, inp0->phi); |
| 343 |
|
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if ((ofp = fopen(outfname, "w")) == NULL) { |
| 344 |
|
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fputs(outfname, stderr); |
| 345 |
|
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fputs(": cannot open for writing\n", stderr); |
| 346 |
|
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return(0); |
| 347 |
|
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} |
| 348 |
|
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fprintf(ofp, "#data written using %s\n", progname); |
| 349 |
|
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fprintf(ofp, "#incident_angle %g %g\n", inp0->theta, inp0->phi); |
| 350 |
|
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fprintf(ofp, "#intheta %g\n", inp0->theta); |
| 351 |
|
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fprintf(ofp, "#inphi %g\n", inp0->phi); |
| 352 |
|
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fprintf(ofp, "#upphi %g\n", inp0->up_phi); |
| 353 |
|
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fprintf(ofp, "#colorimetry: CIE-XYZ\n"); |
| 354 |
|
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for (i = nf; i--; ) |
| 355 |
|
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dtotal += inp0[i].ndata; |
| 356 |
|
|
if (dtotal > 0) |
| 357 |
|
|
fprintf(ofp, "#datapoints_in_file: %d\n", dtotal); |
| 358 |
|
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fprintf(ofp, "#format: theta phi %s\n", inp0->isDSF ? "DSF" : "BSDF"); |
| 359 |
|
|
dtotal = 0; |
| 360 |
|
|
while (nf-- > 0) { /* load channel 1 file(s) */ |
| 361 |
|
|
FILE *ifp = fopen(inp0->fname, "r"); |
| 362 |
|
|
double theta, phi, val[3], sq[2]; |
| 363 |
|
|
|
| 364 |
|
|
if (ifp == NULL || fseek(ifp, inp0->dstart, SEEK_SET) < 0) { |
| 365 |
|
|
fputs(inp0->fname, stderr); |
| 366 |
|
|
fputs(": cannot re-open input file!\n", stderr); |
| 367 |
|
|
return(0); |
| 368 |
|
|
} |
| 369 |
|
|
#ifdef DEBUG |
| 370 |
|
|
fprintf(stderr, "Adding points from '%s' to '%s'\n", |
| 371 |
|
|
inp0->fname, outfname); |
| 372 |
|
|
#endif |
| 373 |
|
|
while (fscanf(ifp, "%lf %lf %lf", &theta, &phi, &val[0]) == 3) { |
| 374 |
|
|
sq_from_ang(sq, theta, phi); |
| 375 |
|
|
val[1] = interp2val(int1, sq[0]*ANGRES, sq[1]*ANGRES); |
| 376 |
|
|
val[2] = interp2val(int2, sq[0]*ANGRES, sq[1]*ANGRES); |
| 377 |
|
|
fprintf(ofp, "%.3f %.3f", theta, phi); |
| 378 |
|
|
for (i = 0; i < 3; i++) |
| 379 |
|
|
fprintf(ofp, " %.4f", |
| 380 |
|
|
sens2xyz[i][0]*val[0] + |
| 381 |
|
|
sens2xyz[i][1]*val[1] + |
| 382 |
|
|
sens2xyz[i][2]*val[2]); |
| 383 |
|
|
fputc('\n', ofp); |
| 384 |
|
|
++dtotal; |
| 385 |
|
|
} |
| 386 |
|
|
fclose(ifp); |
| 387 |
|
|
++inp0; /* advance to next input file */ |
| 388 |
|
|
} |
| 389 |
|
|
#ifdef DEBUG |
| 390 |
|
|
fprintf(stderr, "Wrote %d values to '%s'\n", dtotal, outfname); |
| 391 |
|
|
#endif |
| 392 |
|
|
return(fclose(ofp) == 0); |
| 393 |
|
|
} |
| 394 |
|
|
|
| 395 |
|
|
/* Do next incident direction and advance counters */ |
| 396 |
|
|
static int |
| 397 |
|
|
advance_incidence(PGINPUT *slist[3], int ndx[3]) |
| 398 |
|
|
{ |
| 399 |
|
|
const int i0 = ndx[0]; |
| 400 |
|
|
PGINTERP pgi1, pgi2; |
| 401 |
|
|
int c; |
| 402 |
|
|
/* match up directions */ |
| 403 |
|
|
while ((c = cmp_indir(slist[1]+ndx[1], slist[0]+ndx[0])) < 0) |
| 404 |
|
|
ndx[1]++; |
| 405 |
|
|
if (c) { |
| 406 |
|
|
fputs(slist[0][ndx[0]].fname, stderr); |
| 407 |
|
|
fputs(": warning - missing channel 2 at this incidence\n", stderr); |
| 408 |
|
|
do |
| 409 |
|
|
++ndx[0]; |
| 410 |
|
|
while (!cmp_indir(slist[0]+ndx[0], slist[0]+i0)); |
| 411 |
|
|
return(0); |
| 412 |
|
|
} |
| 413 |
|
|
while ((c = cmp_indir(slist[2]+ndx[2], slist[0]+ndx[0])) < 0) |
| 414 |
|
|
ndx[2]++; |
| 415 |
|
|
if (c) { |
| 416 |
|
|
fputs(slist[0][ndx[0]].fname, stderr); |
| 417 |
|
|
fputs(": warning - missing channel 3 at this incidence\n", stderr); |
| 418 |
|
|
do |
| 419 |
|
|
++ndx[0]; |
| 420 |
|
|
while (!cmp_indir(slist[0]+ndx[0], slist[0]+i0)); |
| 421 |
|
|
return(0); |
| 422 |
|
|
} |
| 423 |
|
|
do /* advance first channel index */ |
| 424 |
|
|
++ndx[0]; |
| 425 |
|
|
while (!cmp_indir(slist[0]+ndx[0], slist[0]+i0)); |
| 426 |
|
|
|
| 427 |
|
|
if (run_subprocess()) /* fork here if multiprocessing */ |
| 428 |
|
|
return(1); |
| 429 |
|
|
/* interpolate channels 2 & 3 */ |
| 430 |
|
|
load_interp(&pgi1, slist[0][i0].igp, slist[1]+ndx[1]); |
| 431 |
|
|
load_interp(&pgi2, slist[0][i0].igp, slist[2]+ndx[2]); |
| 432 |
|
|
if (!interp_xyz(slist[0]+i0, ndx[0]-i0, &pgi1, &pgi2)) |
| 433 |
|
|
return(-1); |
| 434 |
|
|
end_subprocess(); |
| 435 |
|
|
free_interp(&pgi1); |
| 436 |
|
|
free_interp(&pgi2); |
| 437 |
|
|
return(1); |
| 438 |
|
|
} |
| 439 |
|
|
|
| 440 |
|
|
/* Read in single-channel PAB-Opto BSDF files and output XYZ versions */ |
| 441 |
|
|
int |
| 442 |
|
|
main(int argc, char *argv[]) |
| 443 |
|
|
{ |
| 444 |
|
|
char *flist[MAX_INPUTS]; |
| 445 |
|
|
PGINPUT *slist[3]; |
| 446 |
|
|
int i, j; |
| 447 |
|
|
int ndx[3]; |
| 448 |
|
|
/* get options */ |
| 449 |
|
|
progname = argv[0]; |
| 450 |
|
|
for (i = 1; i < argc-3 && argv[i][0] == '-'; i++) |
| 451 |
|
|
switch (argv[i][1]) { |
| 452 |
|
|
case 'n': |
| 453 |
|
|
nprocs = atoi(argv[++i]); |
| 454 |
|
|
break; |
| 455 |
|
|
case 'm': |
| 456 |
|
|
if (i >= argc-(3+9)) |
| 457 |
|
|
goto userr; |
| 458 |
|
|
for (j = 0; j < 3; j++) { |
| 459 |
|
|
sens2xyz[j][0] = atof(argv[++i]); |
| 460 |
|
|
sens2xyz[j][1] = atof(argv[++i]); |
| 461 |
|
|
sens2xyz[j][2] = atof(argv[++i]); |
| 462 |
|
|
} |
| 463 |
|
|
break; |
| 464 |
|
|
case 'o': |
| 465 |
|
|
basename = argv[++i]; |
| 466 |
|
|
break; |
| 467 |
|
|
default: |
| 468 |
|
|
goto userr; |
| 469 |
|
|
} |
| 470 |
|
|
if (i > argc-3) |
| 471 |
|
|
goto userr; |
| 472 |
|
|
for (j = 0; j < 3; j++) { /* prep input channels */ |
| 473 |
|
|
int k, n; |
| 474 |
|
|
n = wordfile(flist, MAX_INPUTS, argv[i+j]); |
| 475 |
|
|
if (n <= 0) { |
| 476 |
|
|
fputs(argv[i+j], stderr); |
| 477 |
|
|
fputs(": cannot load input file names\n", stderr); |
| 478 |
|
|
return(1); |
| 479 |
|
|
} |
| 480 |
|
|
slist[j] = (PGINPUT *)malloc(sizeof(PGINPUT)*(n+1)); |
| 481 |
|
|
if (slist[j] == NULL) { |
| 482 |
|
|
fputs(argv[0], stderr); |
| 483 |
|
|
fputs(": out of memory!\n", stderr); |
| 484 |
|
|
return(1); |
| 485 |
|
|
} |
| 486 |
|
|
#ifdef DEBUG |
| 487 |
|
|
fprintf(stderr, "Checking %d files from '%s'\n", n, argv[i+j]); |
| 488 |
|
|
#endif |
| 489 |
|
|
for (k = 0; k < n; k++) |
| 490 |
|
|
if (!init_pabopto_inp(slist[j]+k, flist[k])) |
| 491 |
|
|
return(1); |
| 492 |
|
|
memset(slist[j]+n, 0, sizeof(PGINPUT)); |
| 493 |
|
|
/* sort by incident direction */ |
| 494 |
|
|
qsort(slist[j], n, sizeof(PGINPUT), cmp_indir); |
| 495 |
|
|
} |
| 496 |
|
|
ndx[0]=ndx[1]=ndx[2]=0; /* compile measurements */ |
| 497 |
|
|
while (slist[0][ndx[0]].dstart) |
| 498 |
|
|
if (advance_incidence(slist, ndx) < 0) |
| 499 |
|
|
return(1); |
| 500 |
|
|
await_children(nchild); /* wait for all to finish */ |
| 501 |
|
|
return(0); |
| 502 |
|
|
userr: |
| 503 |
|
|
fputs("Usage: ", stderr); |
| 504 |
|
|
fputs(argv[0], stderr); |
| 505 |
|
|
fputs(" [-m X1 X2 X3 Y1 Y2 Y3 Z1 Z2 Z3][-o basename][-n nprocs]", stderr); |
| 506 |
|
|
fputs(" s1files.txt s2files.txt s3files.txt\n", stderr); |
| 507 |
|
|
return(1); |
| 508 |
|
|
} |
