| 1 |
#ifndef lint
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| 2 |
static const char RCSid[] = "$Id: dctimestep.c,v 2.4 2009/06/19 14:24:06 greg Exp $";
|
| 3 |
#endif
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| 4 |
/*
|
| 5 |
* Compute time-step result using Daylight Coefficient method.
|
| 6 |
*
|
| 7 |
* G. Ward
|
| 8 |
*/
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| 9 |
|
| 10 |
#include <ctype.h>
|
| 11 |
#include "standard.h"
|
| 12 |
#include "platform.h"
|
| 13 |
#include "color.h"
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| 14 |
#include "resolu.h"
|
| 15 |
#include "bsdf.h"
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| 16 |
|
| 17 |
char *progname; /* global argv[0] */
|
| 18 |
|
| 19 |
/* Data types for file loading */
|
| 20 |
enum {DTfromHeader, DTascii, DTfloat, DTdouble, DTrgbe, DTxyze};
|
| 21 |
|
| 22 |
/* A color coefficient matrix -- vectors have ncols==1 */
|
| 23 |
typedef struct {
|
| 24 |
int nrows, ncols;
|
| 25 |
COLORV cmem[3]; /* extends struct */
|
| 26 |
} CMATRIX;
|
| 27 |
|
| 28 |
#define COLSPEC (sizeof(COLORV)==sizeof(float) ? "%f %f %f" : "%lf %lf %lf")
|
| 29 |
|
| 30 |
#define cm_lval(cm,r,c) ((cm)->cmem + 3*((r)*(cm)->ncols + (c)))
|
| 31 |
|
| 32 |
#define cv_lval(cm,i) ((cm)->cmem + 3*(i))
|
| 33 |
|
| 34 |
/* Allocate a color coefficient matrix */
|
| 35 |
static CMATRIX *
|
| 36 |
cm_alloc(int nrows, int ncols)
|
| 37 |
{
|
| 38 |
CMATRIX *cm;
|
| 39 |
|
| 40 |
if ((nrows <= 0) | (ncols <= 0))
|
| 41 |
return(NULL);
|
| 42 |
cm = (CMATRIX *)malloc(sizeof(CMATRIX) +
|
| 43 |
3*sizeof(COLORV)*(nrows*ncols - 1));
|
| 44 |
if (cm == NULL)
|
| 45 |
error(SYSTEM, "out of memory in cm_alloc()");
|
| 46 |
cm->nrows = nrows;
|
| 47 |
cm->ncols = ncols;
|
| 48 |
return(cm);
|
| 49 |
}
|
| 50 |
|
| 51 |
#define cm_free(cm) free(cm)
|
| 52 |
|
| 53 |
/* Resize color coefficient matrix */
|
| 54 |
static CMATRIX *
|
| 55 |
cm_resize(CMATRIX *cm, int nrows)
|
| 56 |
{
|
| 57 |
if (nrows == cm->nrows)
|
| 58 |
return(cm);
|
| 59 |
if (nrows <= 0) {
|
| 60 |
cm_free(cm);
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| 61 |
return(NULL);
|
| 62 |
}
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| 63 |
cm = (CMATRIX *)realloc(cm, sizeof(CMATRIX) +
|
| 64 |
3*sizeof(COLORV)*(nrows*cm->ncols - 1));
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| 65 |
if (cm == NULL)
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| 66 |
error(SYSTEM, "out of memory in cm_resize()");
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| 67 |
cm->nrows = nrows;
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| 68 |
return(cm);
|
| 69 |
}
|
| 70 |
|
| 71 |
/* Load header to obtain data type */
|
| 72 |
static int
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| 73 |
getDT(char *s, void *p)
|
| 74 |
{
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| 75 |
char fmt[32];
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| 76 |
|
| 77 |
if (formatval(fmt, s)) {
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| 78 |
if (!strcmp(fmt, "ascii"))
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| 79 |
*((int *)p) = DTascii;
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| 80 |
else if (!strcmp(fmt, "float"))
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| 81 |
*((int *)p) = DTfloat;
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| 82 |
else if (!strcmp(fmt, "double"))
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| 83 |
*((int *)p) = DTdouble;
|
| 84 |
else if (!strcmp(fmt, COLRFMT))
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| 85 |
*((int *)p) = DTrgbe;
|
| 86 |
else if (!strcmp(fmt, CIEFMT))
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| 87 |
*((int *)p) = DTxyze;
|
| 88 |
}
|
| 89 |
return(0);
|
| 90 |
}
|
| 91 |
|
| 92 |
static int
|
| 93 |
getDTfromHeader(FILE *fp)
|
| 94 |
{
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| 95 |
int dt = DTfromHeader;
|
| 96 |
|
| 97 |
if (getheader(fp, getDT, &dt) < 0)
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| 98 |
error(SYSTEM, "header read error");
|
| 99 |
if (dt == DTfromHeader)
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| 100 |
error(USER, "missing data format in header");
|
| 101 |
return(dt);
|
| 102 |
}
|
| 103 |
|
| 104 |
/* Allocate and load a matrix from the given file (or stdin if NULL) */
|
| 105 |
static CMATRIX *
|
| 106 |
cm_load(const char *fname, int nrows, int ncols, int dtype)
|
| 107 |
{
|
| 108 |
CMATRIX *cm;
|
| 109 |
FILE *fp = stdin;
|
| 110 |
|
| 111 |
if (fname == NULL)
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| 112 |
fname = "<stdin>";
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| 113 |
else if ((fp = fopen(fname, "r")) == NULL) {
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| 114 |
sprintf(errmsg, "cannot open file '%s'", fname);
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| 115 |
error(SYSTEM, errmsg);
|
| 116 |
}
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| 117 |
if (dtype != DTascii)
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| 118 |
SET_FILE_BINARY(fp);
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| 119 |
if (dtype == DTfromHeader)
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| 120 |
dtype = getDTfromHeader(fp);
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| 121 |
switch (dtype) {
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| 122 |
case DTascii:
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| 123 |
case DTfloat:
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| 124 |
case DTdouble:
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| 125 |
break;
|
| 126 |
default:
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| 127 |
error(USER, "unexpected data type in cm_load()");
|
| 128 |
}
|
| 129 |
if (nrows <= 0) { /* don't know length? */
|
| 130 |
int guessrows = 147; /* usually big enough */
|
| 131 |
if ((dtype != DTascii) & (fp != stdin)) {
|
| 132 |
long startpos = ftell(fp);
|
| 133 |
if (fseek(fp, 0L, SEEK_END) == 0) {
|
| 134 |
long endpos = ftell(fp);
|
| 135 |
long elemsiz = 3*(dtype==DTfloat ?
|
| 136 |
sizeof(float) : sizeof(double));
|
| 137 |
|
| 138 |
if ((endpos - startpos) % (ncols*elemsiz)) {
|
| 139 |
sprintf(errmsg,
|
| 140 |
"improper length for binary file '%s'",
|
| 141 |
fname);
|
| 142 |
error(USER, errmsg);
|
| 143 |
}
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| 144 |
guessrows = (endpos - startpos)/(ncols*elemsiz);
|
| 145 |
if (fseek(fp, startpos, SEEK_SET) < 0) {
|
| 146 |
sprintf(errmsg,
|
| 147 |
"fseek() error on file '%s'",
|
| 148 |
fname);
|
| 149 |
error(SYSTEM, errmsg);
|
| 150 |
}
|
| 151 |
nrows = guessrows; /* we're confident */
|
| 152 |
}
|
| 153 |
}
|
| 154 |
cm = cm_alloc(guessrows, ncols);
|
| 155 |
} else
|
| 156 |
cm = cm_alloc(nrows, ncols);
|
| 157 |
if (cm == NULL)
|
| 158 |
return(NULL);
|
| 159 |
if (dtype == DTascii) { /* read text file */
|
| 160 |
int maxrow = (nrows > 0 ? nrows : 32000);
|
| 161 |
int r, c;
|
| 162 |
for (r = 0; r < maxrow; r++) {
|
| 163 |
if (r >= cm->nrows) /* need more space? */
|
| 164 |
cm = cm_resize(cm, 2*cm->nrows);
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| 165 |
for (c = 0; c < ncols; c++) {
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| 166 |
COLORV *cv = cm_lval(cm,r,c);
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| 167 |
if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3)
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| 168 |
if ((nrows <= 0) & (r > 0) & (c == 0)) {
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| 169 |
cm = cm_resize(cm, maxrow=r);
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| 170 |
break;
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| 171 |
} else
|
| 172 |
goto EOFerror;
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| 173 |
}
|
| 174 |
}
|
| 175 |
while ((c = getc(fp)) != EOF)
|
| 176 |
if (!isspace(c)) {
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| 177 |
sprintf(errmsg,
|
| 178 |
"unexpected data at end of ascii file %s",
|
| 179 |
fname);
|
| 180 |
error(WARNING, errmsg);
|
| 181 |
break;
|
| 182 |
}
|
| 183 |
} else { /* read binary file */
|
| 184 |
if (sizeof(COLORV) == (dtype==DTfloat ? sizeof(float) :
|
| 185 |
sizeof(double))) {
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| 186 |
int nread = 0;
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| 187 |
do { /* read all we can */
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| 188 |
nread += fread(cm->cmem + 3*nread,
|
| 189 |
3*sizeof(COLORV),
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| 190 |
cm->nrows*cm->ncols - nread,
|
| 191 |
fp);
|
| 192 |
if (nrows <= 0) { /* unknown length */
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| 193 |
if (nread == cm->nrows*cm->ncols)
|
| 194 |
/* need more space? */
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| 195 |
cm = cm_resize(cm, 2*cm->nrows);
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| 196 |
else if (nread % cm->ncols == 0)
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| 197 |
/* seem to be done */
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| 198 |
cm = cm_resize(cm, nread/cm->ncols);
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else /* ended mid-row */
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goto EOFerror;
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| 201 |
} else if (nread < cm->nrows*cm->ncols)
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goto EOFerror;
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| 203 |
} while (nread < cm->nrows*cm->ncols);
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| 205 |
} else if (dtype == DTdouble) {
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| 206 |
double dc[3]; /* load from double */
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| 207 |
COLORV *cvp = cm->cmem;
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int n = nrows*ncols;
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| 209 |
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if (n <= 0)
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goto not_handled;
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while (n--) {
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| 213 |
if (fread(dc, sizeof(double), 3, fp) != 3)
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goto EOFerror;
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| 215 |
copycolor(cvp, dc);
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| 216 |
cvp += 3;
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| 217 |
}
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| 218 |
} else /* dtype == DTfloat */ {
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float fc[3]; /* load from float */
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| 220 |
COLORV *cvp = cm->cmem;
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| 221 |
int n = nrows*ncols;
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| 222 |
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| 223 |
if (n <= 0)
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goto not_handled;
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| 225 |
while (n--) {
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| 226 |
if (fread(fc, sizeof(float), 3, fp) != 3)
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goto EOFerror;
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copycolor(cvp, fc);
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cvp += 3;
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}
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}
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if (getc(fp) != EOF) {
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sprintf(errmsg,
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"unexpected data at end of binary file %s",
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| 235 |
fname);
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| 236 |
error(WARNING, errmsg);
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}
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| 238 |
}
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if (fp != stdin)
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| 240 |
fclose(fp);
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| 241 |
return(cm);
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EOFerror:
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| 243 |
sprintf(errmsg, "unexpected EOF reading %s",
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| 244 |
fname);
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| 245 |
error(USER, errmsg);
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| 246 |
not_handled:
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error(INTERNAL, "unhandled data size or length in cm_load()");
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| 248 |
return(NULL); /* gratis return */
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| 249 |
}
|
| 250 |
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| 251 |
/* Multiply two matrices (or a matrix and a vector) and allocate the result*/
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| 252 |
static CMATRIX *
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| 253 |
cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2)
|
| 254 |
{
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| 255 |
CMATRIX *cmr;
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| 256 |
int dr, dc, i;
|
| 257 |
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| 258 |
if ((cm1->ncols <= 0) | (cm1->ncols != cm2->nrows))
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| 259 |
error(INTERNAL, "matrix dimension mismatch in cm_multiply()");
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| 260 |
cmr = cm_alloc(cm1->nrows, cm2->ncols);
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| 261 |
if (cmr == NULL)
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| 262 |
return(NULL);
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| 263 |
for (dr = 0; dr < cmr->nrows; dr++)
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| 264 |
for (dc = 0; dc < cmr->ncols; dc++) {
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| 265 |
COLORV *dp = cm_lval(cmr,dr,dc);
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| 266 |
dp[0] = dp[1] = dp[2] = 0;
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| 267 |
for (i = 0; i < cm1->ncols; i++) {
|
| 268 |
const COLORV *cp1 = cm_lval(cm1,dr,i);
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| 269 |
const COLORV *cp2 = cm_lval(cm2,i,dc);
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| 270 |
dp[0] += cp1[0] * cp2[0];
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| 271 |
dp[1] += cp1[1] * cp2[1];
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| 272 |
dp[2] += cp1[2] * cp2[2];
|
| 273 |
}
|
| 274 |
}
|
| 275 |
return(cmr);
|
| 276 |
}
|
| 277 |
|
| 278 |
/* print out matrix as ASCII text -- no header */
|
| 279 |
static void
|
| 280 |
cm_print(const CMATRIX *cm, FILE *fp)
|
| 281 |
{
|
| 282 |
int r, c;
|
| 283 |
const COLORV *mp = cm->cmem;
|
| 284 |
|
| 285 |
for (r = 0; r < cm->nrows; r++) {
|
| 286 |
for (c = 0; c < cm->ncols; c++, mp += 3)
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| 287 |
fprintf(fp, "\t%.6e %.6e %.6e", mp[0], mp[1], mp[2]);
|
| 288 |
fputc('\n', fp);
|
| 289 |
}
|
| 290 |
}
|
| 291 |
|
| 292 |
/* convert a BSDF to our matrix representation */
|
| 293 |
static CMATRIX *
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| 294 |
cm_bsdf(const struct BSDF_data *bsdf)
|
| 295 |
{
|
| 296 |
CMATRIX *cm = cm_alloc(bsdf->nout, bsdf->ninc);
|
| 297 |
COLORV *mp = cm->cmem;
|
| 298 |
int nbadohm = 0;
|
| 299 |
int nneg = 0;
|
| 300 |
int r, c;
|
| 301 |
|
| 302 |
for (r = 0; r < cm->nrows; r++)
|
| 303 |
for (c = 0; c < cm->ncols; c++, mp += 3) {
|
| 304 |
float f = BSDF_value(bsdf,c,r);
|
| 305 |
float dom = getBSDF_incohm(bsdf,c);
|
| 306 |
FVECT v;
|
| 307 |
|
| 308 |
if (f <= .0) {
|
| 309 |
nneg += (f < -FTINY);
|
| 310 |
continue;
|
| 311 |
}
|
| 312 |
if (dom <= .0) {
|
| 313 |
nbadohm++;
|
| 314 |
continue;
|
| 315 |
}
|
| 316 |
if (!getBSDF_incvec(v,bsdf,c) || v[2] > FTINY)
|
| 317 |
error(USER, "illegal incoming BTDF direction");
|
| 318 |
|
| 319 |
mp[0] = mp[1] = mp[2] = f * dom * -v[2];
|
| 320 |
}
|
| 321 |
if (nneg || nbadohm) {
|
| 322 |
sprintf(errmsg,
|
| 323 |
"BTDF has %d negatives and %d bad incoming solid angles",
|
| 324 |
nneg, nbadohm);
|
| 325 |
error(WARNING, errmsg);
|
| 326 |
}
|
| 327 |
return(cm);
|
| 328 |
}
|
| 329 |
|
| 330 |
/* Sum together a set of images and write result to stdout */
|
| 331 |
static int
|
| 332 |
sum_images(const char *fspec, const CMATRIX *cv)
|
| 333 |
{
|
| 334 |
int myDT = DTfromHeader;
|
| 335 |
CMATRIX *pmat;
|
| 336 |
COLOR *scanline;
|
| 337 |
int myXR, myYR;
|
| 338 |
int i, y;
|
| 339 |
|
| 340 |
if (cv->ncols != 1)
|
| 341 |
error(INTERNAL, "expected vector in sum_images()");
|
| 342 |
for (i = 0; i < cv->nrows; i++) {
|
| 343 |
const COLORV *scv = cv_lval(cv,i);
|
| 344 |
char fname[1024];
|
| 345 |
FILE *fp;
|
| 346 |
int dt, xr, yr;
|
| 347 |
COLORV *psp;
|
| 348 |
/* open next picture */
|
| 349 |
sprintf(fname, fspec, i);
|
| 350 |
if ((fp = fopen(fname, "r")) == NULL) {
|
| 351 |
sprintf(errmsg, "cannot open picture '%s'", fname);
|
| 352 |
error(SYSTEM, errmsg);
|
| 353 |
}
|
| 354 |
SET_FILE_BINARY(fp);
|
| 355 |
dt = getDTfromHeader(fp);
|
| 356 |
if ((dt != DTrgbe) & (dt != DTxyze) ||
|
| 357 |
!fscnresolu(&xr, &yr, fp)) {
|
| 358 |
sprintf(errmsg, "file '%s' not a picture", fname);
|
| 359 |
error(USER, errmsg);
|
| 360 |
}
|
| 361 |
if (myDT == DTfromHeader) { /* on first one */
|
| 362 |
myDT = dt;
|
| 363 |
myXR = xr; myYR = yr;
|
| 364 |
scanline = (COLOR *)malloc(sizeof(COLOR)*myXR);
|
| 365 |
if (scanline == NULL)
|
| 366 |
error(SYSTEM, "out of memory in sum_images()");
|
| 367 |
pmat = cm_alloc(myYR, myXR);
|
| 368 |
memset(pmat->cmem, 0, sizeof(COLOR)*myXR*myYR);
|
| 369 |
/* finish header */
|
| 370 |
fputformat(myDT==DTrgbe ? COLRFMT : CIEFMT, stdout);
|
| 371 |
fputc('\n', stdout);
|
| 372 |
fprtresolu(myXR, myYR, stdout);
|
| 373 |
fflush(stdout);
|
| 374 |
} else if ((dt != myDT) | (xr != myXR) | (yr != myYR)) {
|
| 375 |
sprintf(errmsg, "picture '%s' format/size mismatch",
|
| 376 |
fname);
|
| 377 |
error(USER, errmsg);
|
| 378 |
}
|
| 379 |
psp = pmat->cmem;
|
| 380 |
for (y = 0; y < yr; y++) { /* read it in */
|
| 381 |
int x;
|
| 382 |
if (freadscan(scanline, xr, fp) < 0) {
|
| 383 |
sprintf(errmsg, "error reading picture '%s'",
|
| 384 |
fname);
|
| 385 |
error(SYSTEM, errmsg);
|
| 386 |
}
|
| 387 |
/* sum in scanline */
|
| 388 |
for (x = 0; x < xr; x++, psp += 3) {
|
| 389 |
multcolor(scanline[x], scv);
|
| 390 |
addcolor(psp, scanline[x]);
|
| 391 |
}
|
| 392 |
}
|
| 393 |
fclose(fp); /* done this picture */
|
| 394 |
}
|
| 395 |
free(scanline);
|
| 396 |
/* write scanlines */
|
| 397 |
for (y = 0; y < myYR; y++)
|
| 398 |
if (fwritescan((COLOR *)cm_lval(pmat, y, 0), myXR, stdout) < 0)
|
| 399 |
return(0);
|
| 400 |
cm_free(pmat); /* all done */
|
| 401 |
return(fflush(stdout) == 0);
|
| 402 |
}
|
| 403 |
|
| 404 |
/* check to see if a string contains a %d specification */
|
| 405 |
int
|
| 406 |
hasDecimalSpec(const char *s)
|
| 407 |
{
|
| 408 |
while (*s && *s != '%')
|
| 409 |
s++;
|
| 410 |
if (!*s)
|
| 411 |
return(0);
|
| 412 |
do
|
| 413 |
++s;
|
| 414 |
while (isdigit(*s));
|
| 415 |
|
| 416 |
return(*s == 'd');
|
| 417 |
}
|
| 418 |
|
| 419 |
int
|
| 420 |
main(int argc, char *argv[])
|
| 421 |
{
|
| 422 |
CMATRIX *tvec, *Dmat, *Tmat, *ivec, *cvec;
|
| 423 |
struct BSDF_data *btdf;
|
| 424 |
|
| 425 |
progname = argv[0];
|
| 426 |
|
| 427 |
if ((argc < 4) | (argc > 5)) {
|
| 428 |
fprintf(stderr, "Usage: %s Vspec Tbsdf.xml Dmat.dat [tregvec]\n",
|
| 429 |
progname);
|
| 430 |
return(1);
|
| 431 |
}
|
| 432 |
/* load Tregenza vector */
|
| 433 |
tvec = cm_load(argv[4], 0, 1, DTascii); /* argv[4]==NULL iff argc==4 */
|
| 434 |
/* load BTDF */
|
| 435 |
btdf = load_BSDF(argv[2]);
|
| 436 |
if (btdf == NULL)
|
| 437 |
return(1);
|
| 438 |
/* load Daylight matrix */
|
| 439 |
Dmat = cm_load(argv[3], btdf->ninc, tvec->nrows, DTfromHeader);
|
| 440 |
/* multiply vector through */
|
| 441 |
ivec = cm_multiply(Dmat, tvec);
|
| 442 |
cm_free(Dmat); cm_free(tvec);
|
| 443 |
Tmat = cm_bsdf(btdf); /* convert BTDF to matrix */
|
| 444 |
free_BSDF(btdf);
|
| 445 |
cvec = cm_multiply(Tmat, ivec); /* cvec = component vector */
|
| 446 |
cm_free(Tmat); cm_free(ivec);
|
| 447 |
if (hasDecimalSpec(argv[1])) { /* generating image */
|
| 448 |
SET_FILE_BINARY(stdout);
|
| 449 |
newheader("RADIANCE", stdout);
|
| 450 |
printargs(argc, argv, stdout);
|
| 451 |
fputnow(stdout);
|
| 452 |
if (!sum_images(argv[1], cvec))
|
| 453 |
return(1);
|
| 454 |
} else { /* generating vector */
|
| 455 |
CMATRIX *Vmat = cm_load(argv[1], 0, cvec->nrows, DTfromHeader);
|
| 456 |
CMATRIX *rvec = cm_multiply(Vmat, cvec);
|
| 457 |
cm_free(Vmat);
|
| 458 |
cm_print(rvec, stdout);
|
| 459 |
cm_free(rvec);
|
| 460 |
}
|
| 461 |
cm_free(cvec); /* final clean-up */
|
| 462 |
return(0);
|
| 463 |
}
|
