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root/radiance/ray/src/util/dctimestep.c
Revision: 2.27
Committed: Sat Jan 19 22:30:55 2013 UTC (9 years, 10 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.26: +26 -1 lines
Log Message:
Improved efficiency of large matrix multiplications containing zero vectors

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: dctimestep.c,v 2.26 2013/01/11 17:54:17 greg Exp $";
3 #endif
4 /*
5 * Compute time-step result using Daylight Coefficient method.
6 *
7 * G. Ward
8 */
9
10 #include <ctype.h>
11 #include "standard.h"
12 #include "platform.h"
13 #include "paths.h"
14 #include "color.h"
15 #include "resolu.h"
16 #include "bsdf.h"
17 #include "bsdf_m.h"
18
19 char *progname; /* global argv[0] */
20
21 /* Data types for file loading */
22 enum {DTfromHeader, DTascii, DTfloat, DTdouble, DTrgbe, DTxyze};
23
24 /* A color coefficient matrix -- vectors have ncols==1 */
25 typedef struct {
26 int nrows, ncols;
27 COLORV cmem[3]; /* extends struct */
28 } CMATRIX;
29
30 #define COLSPEC (sizeof(COLORV)==sizeof(float) ? "%f %f %f" : "%lf %lf %lf")
31
32 #define cm_lval(cm,r,c) ((cm)->cmem + 3*((r)*(cm)->ncols + (c)))
33
34 #define cv_lval(cm,i) ((cm)->cmem + 3*(i))
35
36 /* Allocate a color coefficient matrix */
37 static CMATRIX *
38 cm_alloc(int nrows, int ncols)
39 {
40 CMATRIX *cm;
41
42 if ((nrows <= 0) | (ncols <= 0))
43 error(USER, "attempt to create empty matrix");
44 cm = (CMATRIX *)malloc(sizeof(CMATRIX) +
45 3*sizeof(COLORV)*(nrows*ncols - 1));
46 if (cm == NULL)
47 error(SYSTEM, "out of memory in cm_alloc()");
48 cm->nrows = nrows;
49 cm->ncols = ncols;
50 return(cm);
51 }
52
53 #define cm_free(cm) free(cm)
54
55 /* Resize color coefficient matrix */
56 static CMATRIX *
57 cm_resize(CMATRIX *cm, int nrows)
58 {
59 if (nrows == cm->nrows)
60 return(cm);
61 if (nrows <= 0) {
62 cm_free(cm);
63 return(NULL);
64 }
65 cm = (CMATRIX *)realloc(cm, sizeof(CMATRIX) +
66 3*sizeof(COLORV)*(nrows*cm->ncols - 1));
67 if (cm == NULL)
68 error(SYSTEM, "out of memory in cm_resize()");
69 cm->nrows = nrows;
70 return(cm);
71 }
72
73 /* Load header to obtain data type */
74 static int
75 getDT(char *s, void *p)
76 {
77 char fmt[32];
78
79 if (formatval(fmt, s)) {
80 if (!strcmp(fmt, "ascii"))
81 *((int *)p) = DTascii;
82 else if (!strcmp(fmt, "float"))
83 *((int *)p) = DTfloat;
84 else if (!strcmp(fmt, "double"))
85 *((int *)p) = DTdouble;
86 else if (!strcmp(fmt, COLRFMT))
87 *((int *)p) = DTrgbe;
88 else if (!strcmp(fmt, CIEFMT))
89 *((int *)p) = DTxyze;
90 }
91 return(0);
92 }
93
94 static int
95 getDTfromHeader(FILE *fp)
96 {
97 int dt = DTfromHeader;
98
99 if (getheader(fp, getDT, &dt) < 0)
100 error(SYSTEM, "header read error");
101 if (dt == DTfromHeader)
102 error(USER, "missing data format in header");
103 return(dt);
104 }
105
106 /* Allocate and load a matrix from the given file (or stdin if NULL) */
107 static CMATRIX *
108 cm_load(const char *fname, int nrows, int ncols, int dtype)
109 {
110 FILE *fp = stdin;
111 CMATRIX *cm;
112
113 if (ncols <= 0)
114 error(USER, "Non-positive number of columns");
115 if (fname == NULL)
116 fname = "<stdin>";
117 else if ((fp = fopen(fname, "r")) == NULL) {
118 sprintf(errmsg, "cannot open file '%s'", fname);
119 error(SYSTEM, errmsg);
120 }
121 #ifdef getc_unlocked
122 flockfile(fp);
123 #endif
124 if (dtype != DTascii)
125 SET_FILE_BINARY(fp); /* doesn't really work */
126 if (dtype == DTfromHeader)
127 dtype = getDTfromHeader(fp);
128 switch (dtype) {
129 case DTascii:
130 case DTfloat:
131 case DTdouble:
132 break;
133 default:
134 error(USER, "unexpected data type in cm_load()");
135 }
136 if (nrows <= 0) { /* don't know length? */
137 int guessrows = 147; /* usually big enough */
138 if ((dtype != DTascii) & (fp != stdin)) {
139 long startpos = ftell(fp);
140 if (fseek(fp, 0L, SEEK_END) == 0) {
141 long endpos = ftell(fp);
142 long elemsiz = 3*(dtype==DTfloat ?
143 sizeof(float) : sizeof(double));
144
145 if ((endpos - startpos) % (ncols*elemsiz)) {
146 sprintf(errmsg,
147 "improper length for binary file '%s'",
148 fname);
149 error(USER, errmsg);
150 }
151 guessrows = (endpos - startpos)/(ncols*elemsiz);
152 if (fseek(fp, startpos, SEEK_SET) < 0) {
153 sprintf(errmsg,
154 "fseek() error on file '%s'",
155 fname);
156 error(SYSTEM, errmsg);
157 }
158 nrows = guessrows; /* we're confident */
159 }
160 }
161 cm = cm_alloc(guessrows, ncols);
162 } else
163 cm = cm_alloc(nrows, ncols);
164 if (cm == NULL) /* XXX never happens */
165 return(NULL);
166 if (dtype == DTascii) { /* read text file */
167 int maxrow = (nrows > 0 ? nrows : 32000);
168 int r, c;
169 for (r = 0; r < maxrow; r++) {
170 if (r >= cm->nrows) /* need more space? */
171 cm = cm_resize(cm, 2*cm->nrows);
172 for (c = 0; c < ncols; c++) {
173 COLORV *cv = cm_lval(cm,r,c);
174 if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3)
175 if ((nrows <= 0) & (r > 0) & !c) {
176 cm = cm_resize(cm, maxrow=r);
177 break;
178 } else
179 goto EOFerror;
180 }
181 }
182 while ((c = getc(fp)) != EOF)
183 if (!isspace(c)) {
184 sprintf(errmsg,
185 "unexpected data at end of ascii file %s",
186 fname);
187 error(WARNING, errmsg);
188 break;
189 }
190 } else { /* read binary file */
191 if (sizeof(COLORV) == (dtype==DTfloat ? sizeof(float) :
192 sizeof(double))) {
193 int nread = 0;
194 do { /* read all we can */
195 nread += fread(cm->cmem + 3*nread,
196 3*sizeof(COLORV),
197 cm->nrows*cm->ncols - nread,
198 fp);
199 if (nrows <= 0) { /* unknown length */
200 if (nread == cm->nrows*cm->ncols)
201 /* need more space? */
202 cm = cm_resize(cm, 2*cm->nrows);
203 else if (nread && !(nread % cm->ncols))
204 /* seem to be done */
205 cm = cm_resize(cm, nread/cm->ncols);
206 else /* ended mid-row */
207 goto EOFerror;
208 } else if (nread < cm->nrows*cm->ncols)
209 goto EOFerror;
210 } while (nread < cm->nrows*cm->ncols);
211
212 } else if (dtype == DTdouble) {
213 double dc[3]; /* load from double */
214 COLORV *cvp = cm->cmem;
215 int n = nrows*ncols;
216
217 if (n <= 0)
218 goto not_handled;
219 while (n--) {
220 if (fread(dc, sizeof(double), 3, fp) != 3)
221 goto EOFerror;
222 copycolor(cvp, dc);
223 cvp += 3;
224 }
225 } else /* dtype == DTfloat */ {
226 float fc[3]; /* load from float */
227 COLORV *cvp = cm->cmem;
228 int n = nrows*ncols;
229
230 if (n <= 0)
231 goto not_handled;
232 while (n--) {
233 if (fread(fc, sizeof(float), 3, fp) != 3)
234 goto EOFerror;
235 copycolor(cvp, fc);
236 cvp += 3;
237 }
238 }
239 if (fgetc(fp) != EOF) {
240 sprintf(errmsg,
241 "unexpected data at end of binary file %s",
242 fname);
243 error(WARNING, errmsg);
244 }
245 }
246 if (fp != stdin)
247 fclose(fp);
248 #ifdef getc_unlocked
249 else
250 funlockfile(fp);
251 #endif
252 return(cm);
253 EOFerror:
254 sprintf(errmsg, "unexpected EOF reading %s", fname);
255 error(USER, errmsg);
256 not_handled:
257 error(INTERNAL, "unhandled data size or length in cm_load()");
258 return(NULL); /* gratis return */
259 }
260
261 /* Extract a column vector from a matrix */
262 static CMATRIX *
263 cm_column(const CMATRIX *cm, int c)
264 {
265 CMATRIX *cvr;
266 int dr;
267
268 if ((c < 0) | (c >= cm->ncols))
269 error(INTERNAL, "column requested outside matrix");
270 cvr = cm_alloc(cm->nrows, 1);
271 if (cvr == NULL)
272 return(NULL);
273 for (dr = 0; dr < cm->nrows; dr++) {
274 const COLORV *sp = cm_lval(cm,dr,c);
275 COLORV *dp = cv_lval(cvr,dr);
276 dp[0] = sp[0];
277 dp[1] = sp[1];
278 dp[2] = sp[2];
279 }
280 return(cvr);
281 }
282
283 /* Scale a matrix by a single value */
284 static CMATRIX *
285 cm_scale(const CMATRIX *cm1, const COLOR sca)
286 {
287 CMATRIX *cmr;
288 int dr, dc;
289
290 cmr = cm_alloc(cm1->nrows, cm1->ncols);
291 if (cmr == NULL)
292 return(NULL);
293 for (dr = 0; dr < cmr->nrows; dr++)
294 for (dc = 0; dc < cmr->ncols; dc++) {
295 const COLORV *sp = cm_lval(cm1,dr,dc);
296 COLORV *dp = cm_lval(cmr,dr,dc);
297 dp[0] = sp[0] * sca[0];
298 dp[1] = sp[1] * sca[1];
299 dp[2] = sp[2] * sca[2];
300 }
301 return(cmr);
302 }
303
304 /* Multiply two matrices (or a matrix and a vector) and allocate the result */
305 static CMATRIX *
306 cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2)
307 {
308 char *rowcheck=NULL, *colcheck=NULL;
309 CMATRIX *cmr;
310 int dr, dc, i;
311
312 if ((cm1->ncols <= 0) | (cm1->ncols != cm2->nrows))
313 error(INTERNAL, "matrix dimension mismatch in cm_multiply()");
314 cmr = cm_alloc(cm1->nrows, cm2->ncols);
315 if (cmr == NULL)
316 return(NULL);
317 /* optimization: check for zero rows & cols */
318 if (((cm1->nrows > 5) | (cm2->ncols > 5)) & (cm1->ncols > 5)) {
319 static const COLOR czero;
320 rowcheck = (char *)calloc(cmr->nrows, 1);
321 for (dr = cm1->nrows*(rowcheck != NULL); dr--; )
322 for (dc = cm1->ncols; dc--; )
323 if (memcmp(cm_lval(cm1,dr,dc), czero, sizeof(COLOR))) {
324 rowcheck[dr] = 1;
325 break;
326 }
327 colcheck = (char *)calloc(cmr->ncols, 1);
328 for (dc = cm2->ncols*(colcheck != NULL); dc--; )
329 for (dr = cm2->nrows; dr--; )
330 if (memcmp(cm_lval(cm2,dr,dc), czero, sizeof(COLOR))) {
331 colcheck[dc] = 1;
332 break;
333 }
334 }
335 for (dr = 0; dr < cmr->nrows; dr++)
336 for (dc = 0; dc < cmr->ncols; dc++) {
337 COLORV *dp = cm_lval(cmr,dr,dc);
338 dp[0] = dp[1] = dp[2] = 0;
339 if (rowcheck != NULL && !rowcheck[dr])
340 continue;
341 if (colcheck != NULL && !colcheck[dc])
342 continue;
343 for (i = 0; i < cm1->ncols; i++) {
344 const COLORV *cp1 = cm_lval(cm1,dr,i);
345 const COLORV *cp2 = cm_lval(cm2,i,dc);
346 dp[0] += cp1[0] * cp2[0];
347 dp[1] += cp1[1] * cp2[1];
348 dp[2] += cp1[2] * cp2[2];
349 }
350 }
351 if (rowcheck != NULL) free(rowcheck);
352 if (colcheck != NULL) free(colcheck);
353 return(cmr);
354 }
355
356 /* print out matrix as ASCII text -- no header */
357 static void
358 cm_print(const CMATRIX *cm, FILE *fp)
359 {
360 int r, c;
361 const COLORV *mp = cm->cmem;
362
363 for (r = 0; r < cm->nrows; r++) {
364 for (c = 0; c < cm->ncols; c++, mp += 3)
365 fprintf(fp, "\t%.6e %.6e %.6e", mp[0], mp[1], mp[2]);
366 fputc('\n', fp);
367 }
368 }
369
370 /* Convert a BSDF to our matrix representation */
371 static CMATRIX *
372 cm_bsdf(const COLOR bsdfLamb, const COLOR specCol, const SDMat *bsdf)
373 {
374 CMATRIX *cm = cm_alloc(bsdf->nout, bsdf->ninc);
375 int nbadohm = 0;
376 int nneg = 0;
377 int r, c;
378 /* loop over incident angles */
379 for (c = 0; c < cm->ncols; c++) {
380 const double dom = mBSDF_incohm(bsdf,c);
381 /* projected solid angle */
382 nbadohm += (dom <= 0);
383
384 for (r = 0; r < cm->nrows; r++) {
385 float f = mBSDF_value(bsdf,c,r);
386 COLORV *mp = cm_lval(cm,r,c);
387 /* check BSDF value */
388 if ((f <= 0) | (dom <= 0)) {
389 nneg += (f < -FTINY);
390 f = .0f;
391 }
392 copycolor(mp, specCol);
393 scalecolor(mp, f);
394 addcolor(mp, bsdfLamb);
395 scalecolor(mp, dom);
396 }
397 }
398 if (nneg | nbadohm) {
399 sprintf(errmsg,
400 "BTDF has %d negatives and %d bad incoming solid angles",
401 nneg, nbadohm);
402 error(WARNING, errmsg);
403 }
404 return(cm);
405 }
406
407 /* Convert between input and output indices for reciprocity */
408 static int
409 recip_out_from_in(const SDMat *bsdf, int in_recip)
410 {
411 FVECT v;
412
413 if (!mBSDF_incvec(v, bsdf, in_recip+.5))
414 return(in_recip); /* XXX should be error! */
415 v[2] = -v[2];
416 return(mBSDF_outndx(bsdf, v));
417 }
418
419 /* Convert between output and input indices for reciprocity */
420 static int
421 recip_in_from_out(const SDMat *bsdf, int out_recip)
422 {
423 FVECT v;
424
425 if (!mBSDF_outvec(v, bsdf, out_recip+.5))
426 return(out_recip); /* XXX should be error! */
427 v[2] = -v[2];
428 return(mBSDF_incndx(bsdf, v));
429 }
430
431 /* Convert a BSDF to our matrix representation, applying reciprocity */
432 static CMATRIX *
433 cm_bsdf_recip(const COLOR bsdfLamb, const COLOR specCol, const SDMat *bsdf)
434 {
435 CMATRIX *cm = cm_alloc(bsdf->ninc, bsdf->nout);
436 int nbadohm = 0;
437 int nneg = 0;
438 int r, c;
439 /* loop over incident angles */
440 for (c = 0; c < cm->ncols; c++) {
441 const int ro = recip_out_from_in(bsdf,c);
442 const double dom = mBSDF_outohm(bsdf,ro);
443 /* projected solid angle */
444 nbadohm += (dom <= 0);
445
446 for (r = 0; r < cm->nrows; r++) {
447 const int ri = recip_in_from_out(bsdf,r);
448 float f = mBSDF_value(bsdf,ri,ro);
449 COLORV *mp = cm_lval(cm,r,c);
450 /* check BSDF value */
451 if ((f <= 0) | (dom <= 0)) {
452 nneg += (f < -FTINY);
453 f = .0f;
454 }
455 copycolor(mp, specCol);
456 scalecolor(mp, f);
457 addcolor(mp, bsdfLamb);
458 scalecolor(mp, dom);
459 }
460 }
461 if (nneg | nbadohm) {
462 sprintf(errmsg,
463 "BTDF has %d negatives and %d bad incoming solid angles",
464 nneg, nbadohm);
465 error(WARNING, errmsg);
466 }
467 return(cm);
468 }
469
470 /* Load and convert a matrix BSDF from the given XML file */
471 static CMATRIX *
472 cm_loadBSDF(char *fname, COLOR cLamb)
473 {
474 CMATRIX *Tmat;
475 char *fpath;
476 int recip;
477 SDError ec;
478 SDData myBSDF;
479 SDSpectralDF *tdf;
480 COLOR bsdfLamb, specCol;
481 /* find path to BSDF file */
482 fpath = getpath(fname, getrlibpath(), R_OK);
483 if (fpath == NULL) {
484 sprintf(errmsg, "cannot find BSDF file '%s'", fname);
485 error(USER, errmsg);
486 }
487 SDclearBSDF(&myBSDF, fname); /* load XML and check type */
488 ec = SDloadFile(&myBSDF, fpath);
489 if (ec)
490 error(USER, transSDError(ec));
491 ccy2rgb(&myBSDF.tLamb.spec, myBSDF.tLamb.cieY/PI, bsdfLamb);
492 recip = (myBSDF.tb == NULL);
493 tdf = recip ? myBSDF.tf : myBSDF.tb;
494 if (tdf == NULL) { /* no non-Lambertian transmission? */
495 if (cLamb != NULL)
496 copycolor(cLamb, bsdfLamb);
497 SDfreeBSDF(&myBSDF);
498 return(NULL);
499 }
500 if (tdf->ncomp != 1 || tdf->comp[0].func != &SDhandleMtx) {
501 sprintf(errmsg, "unsupported BSDF '%s'", fpath);
502 error(USER, errmsg);
503 }
504 /* convert BTDF to matrix */
505 ccy2rgb(&tdf->comp[0].cspec[0], 1., specCol);
506 Tmat = recip ? cm_bsdf_recip(bsdfLamb, specCol, (SDMat *)tdf->comp[0].dist)
507 : cm_bsdf(bsdfLamb, specCol, (SDMat *)tdf->comp[0].dist);
508 if (cLamb != NULL) /* Lambertian is included */
509 setcolor(cLamb, .0, .0, .0);
510 /* free BSDF and return */
511 SDfreeBSDF(&myBSDF);
512 return(Tmat);
513 }
514
515 /* Sum together a set of images and write result to fout */
516 static int
517 sum_images(const char *fspec, const CMATRIX *cv, FILE *fout)
518 {
519 int myDT = DTfromHeader;
520 COLOR *scanline = NULL;
521 CMATRIX *pmat = NULL;
522 int myXR=0, myYR=0;
523 int i, y;
524
525 if (cv->ncols != 1)
526 error(INTERNAL, "expected vector in sum_images()");
527 for (i = 0; i < cv->nrows; i++) {
528 const COLORV *scv = cv_lval(cv,i);
529 char fname[1024];
530 FILE *fp;
531 int dt, xr, yr;
532 COLORV *psp;
533 /* check for zero */
534 if ((scv[RED] == 0) & (scv[GRN] == 0) & (scv[BLU] == 0) &&
535 (myDT != DTfromHeader) | (i < cv->nrows-1))
536 continue;
537 /* open next picture */
538 sprintf(fname, fspec, i);
539 if ((fp = fopen(fname, "r")) == NULL) {
540 sprintf(errmsg, "cannot open picture '%s'", fname);
541 error(SYSTEM, errmsg);
542 }
543 SET_FILE_BINARY(fp);
544 dt = getDTfromHeader(fp);
545 if ((dt != DTrgbe) & (dt != DTxyze) ||
546 !fscnresolu(&xr, &yr, fp)) {
547 sprintf(errmsg, "file '%s' not a picture", fname);
548 error(USER, errmsg);
549 }
550 if (myDT == DTfromHeader) { /* on first one */
551 myDT = dt;
552 myXR = xr; myYR = yr;
553 scanline = (COLOR *)malloc(sizeof(COLOR)*myXR);
554 if (scanline == NULL)
555 error(SYSTEM, "out of memory in sum_images()");
556 pmat = cm_alloc(myYR, myXR);
557 memset(pmat->cmem, 0, sizeof(COLOR)*myXR*myYR);
558 /* finish header */
559 fputformat(myDT==DTrgbe ? COLRFMT : CIEFMT, fout);
560 fputc('\n', fout);
561 fprtresolu(myXR, myYR, fout);
562 fflush(fout);
563 } else if ((dt != myDT) | (xr != myXR) | (yr != myYR)) {
564 sprintf(errmsg, "picture '%s' format/size mismatch",
565 fname);
566 error(USER, errmsg);
567 }
568 psp = pmat->cmem;
569 for (y = 0; y < yr; y++) { /* read it in */
570 int x;
571 if (freadscan(scanline, xr, fp) < 0) {
572 sprintf(errmsg, "error reading picture '%s'",
573 fname);
574 error(SYSTEM, errmsg);
575 }
576 /* sum in scanline */
577 for (x = 0; x < xr; x++, psp += 3) {
578 multcolor(scanline[x], scv);
579 addcolor(psp, scanline[x]);
580 }
581 }
582 fclose(fp); /* done this picture */
583 }
584 free(scanline);
585 /* write scanlines */
586 for (y = 0; y < myYR; y++)
587 if (fwritescan((COLOR *)cm_lval(pmat, y, 0), myXR, fout) < 0)
588 return(0);
589 cm_free(pmat); /* all done */
590 return(fflush(fout) == 0);
591 }
592
593 /* check to see if a string contains a %d or %o specification */
594 static int
595 hasNumberFormat(const char *s)
596 {
597 if (s == NULL)
598 return(0);
599
600 while (*s) {
601 while (*s != '%')
602 if (!*s++)
603 return(0);
604 if (*++s == '%') { /* ignore "%%" */
605 ++s;
606 continue;
607 }
608 while (isdigit(*s)) /* field length */
609 ++s;
610 /* field we'll use? */
611 if ((*s == 'd') | (*s == 'i') | (*s == 'o') |
612 (*s == 'x') | (*s == 'X'))
613 return(1);
614 }
615 return(0); /* didn't find one */
616 }
617
618 int
619 main(int argc, char *argv[])
620 {
621 int skyfmt = DTascii;
622 int nsteps = 1;
623 char *ofspec = NULL;
624 FILE *ofp = stdout;
625 CMATRIX *cmtx; /* component vector/matrix result */
626 char fnbuf[256];
627 int a, i;
628
629 progname = argv[0];
630 /* get options */
631 for (a = 1; a < argc && argv[a][0] == '-'; a++)
632 switch (argv[a][1]) {
633 case 'n':
634 nsteps = atoi(argv[++a]);
635 if (nsteps <= 0)
636 goto userr;
637 break;
638 case 'o':
639 ofspec = argv[++a];
640 break;
641 case 'i':
642 switch (argv[a][2]) {
643 case 'f':
644 skyfmt = DTfloat;
645 break;
646 case 'd':
647 skyfmt = DTdouble;
648 break;
649 case 'a':
650 skyfmt = DTascii;
651 break;
652 default:
653 goto userr;
654 }
655 break;
656 default:
657 goto userr;
658 }
659 if ((argc-a < 1) | (argc-a > 4))
660 goto userr;
661
662 if (argc-a > 2) { /* VTDs expression */
663 CMATRIX *smtx, *Dmat, *Tmat, *imtx;
664 COLOR tLamb;
665 /* get sky vector/matrix */
666 smtx = cm_load(argv[a+3], 0, nsteps, skyfmt);
667 /* load BSDF */
668 Tmat = cm_loadBSDF(argv[a+1], tLamb);
669 /* load Daylight matrix */
670 Dmat = cm_load(argv[a+2], Tmat==NULL ? 0 : Tmat->ncols,
671 smtx->nrows, DTfromHeader);
672 /* multiply vector through */
673 imtx = cm_multiply(Dmat, smtx);
674 cm_free(Dmat); cm_free(smtx);
675 if (Tmat == NULL) { /* diffuse only */
676 cmtx = cm_scale(imtx, tLamb);
677 } else { /* else apply BTDF matrix */
678 cmtx = cm_multiply(Tmat, imtx);
679 cm_free(Tmat);
680 }
681 cm_free(imtx);
682 } else { /* sky vector/matrix only */
683 cmtx = cm_load(argv[a+1], 0, nsteps, skyfmt);
684 }
685 /* prepare output stream */
686 if ((ofspec != NULL) & (nsteps == 1) && hasNumberFormat(ofspec)) {
687 sprintf(fnbuf, ofspec, 1);
688 ofspec = fnbuf;
689 }
690 if (ofspec != NULL && !hasNumberFormat(ofspec)) {
691 if ((ofp = fopen(ofspec, "w")) == NULL) {
692 fprintf(stderr, "%s: cannot open '%s' for output\n",
693 progname, ofspec);
694 return(1);
695 }
696 ofspec = NULL; /* only need to open once */
697 }
698 if (hasNumberFormat(argv[a])) { /* generating image(s) */
699 if (ofspec == NULL) {
700 SET_FILE_BINARY(ofp);
701 newheader("RADIANCE", ofp);
702 printargs(argc, argv, ofp);
703 fputnow(ofp);
704 }
705 if (nsteps > 1) /* multiple output frames? */
706 for (i = 0; i < nsteps; i++) {
707 CMATRIX *cvec = cm_column(cmtx, i);
708 if (ofspec != NULL) {
709 sprintf(fnbuf, ofspec, i+1);
710 if ((ofp = fopen(fnbuf, "wb")) == NULL) {
711 fprintf(stderr,
712 "%s: cannot open '%s' for output\n",
713 progname, fnbuf);
714 return(1);
715 }
716 newheader("RADIANCE", ofp);
717 printargs(argc, argv, ofp);
718 fputnow(ofp);
719 }
720 fprintf(ofp, "FRAME=%d\n", i+1);
721 if (!sum_images(argv[a], cvec, ofp))
722 return(1);
723 if (ofspec != NULL) {
724 if (fclose(ofp) == EOF) {
725 fprintf(stderr,
726 "%s: error writing to '%s'\n",
727 progname, fnbuf);
728 return(1);
729 }
730 ofp = stdout;
731 }
732 cm_free(cvec);
733 }
734 else if (!sum_images(argv[a], cmtx, ofp))
735 return(1);
736 } else { /* generating vector/matrix */
737 CMATRIX *Vmat = cm_load(argv[a], 0, cmtx->nrows, DTfromHeader);
738 CMATRIX *rmtx = cm_multiply(Vmat, cmtx);
739 cm_free(Vmat);
740 if (ofspec != NULL) /* multiple vector files? */
741 for (i = 0; i < nsteps; i++) {
742 CMATRIX *rvec = cm_column(rmtx, i);
743 sprintf(fnbuf, ofspec, i+1);
744 if ((ofp = fopen(fnbuf, "w")) == NULL) {
745 fprintf(stderr,
746 "%s: cannot open '%s' for output\n",
747 progname, fnbuf);
748 return(1);
749 }
750 cm_print(rvec, ofp);
751 if (fclose(ofp) == EOF) {
752 fprintf(stderr,
753 "%s: error writing to '%s'\n",
754 progname, fnbuf);
755 return(1);
756 }
757 ofp = stdout;
758 cm_free(rvec);
759 }
760 else
761 cm_print(rmtx, ofp);
762 cm_free(rmtx);
763 }
764 if (fflush(ofp) == EOF) { /* final clean-up */
765 fprintf(stderr, "%s: write error on output\n", progname);
766 return(1);
767 }
768 cm_free(cmtx);
769 return(0);
770 userr:
771 fprintf(stderr, "Usage: %s [-n nsteps][-o ospec][-i{f|d}] DCspec [skyf]\n",
772 progname);
773 fprintf(stderr, " or: %s [-n nsteps][-o ospec][-i{f|d}] Vspec Tbsdf.xml Dmat.dat [skyf]\n",
774 progname);
775 return(1);
776 }