ViewVC Help
View File | Revision Log | Show Annotations | Download File | Root Listing
root/radiance/ray/src/util/dctimestep.c
Revision: 2.20
Committed: Tue Aug 7 18:17:17 2012 UTC (10 years, 4 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.19: +46 -11 lines
Log Message:
Added Rob G's Ruby version of objview and fixed dctimestep for Lambertian BTDFs

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: dctimestep.c,v 2.19 2012/02/21 20:09:25 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 CMATRIX *cm;
111 FILE *fp = stdin;
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 if (dtype != DTascii)
122 SET_FILE_BINARY(fp);
123 if (dtype == DTfromHeader)
124 dtype = getDTfromHeader(fp);
125 switch (dtype) {
126 case DTascii:
127 case DTfloat:
128 case DTdouble:
129 break;
130 default:
131 error(USER, "unexpected data type in cm_load()");
132 }
133 if (nrows <= 0) { /* don't know length? */
134 int guessrows = 147; /* usually big enough */
135 if ((dtype != DTascii) & (fp != stdin)) {
136 long startpos = ftell(fp);
137 if (fseek(fp, 0L, SEEK_END) == 0) {
138 long endpos = ftell(fp);
139 long elemsiz = 3*(dtype==DTfloat ?
140 sizeof(float) : sizeof(double));
141
142 if ((endpos - startpos) % (ncols*elemsiz)) {
143 sprintf(errmsg,
144 "improper length for binary file '%s'",
145 fname);
146 error(USER, errmsg);
147 }
148 guessrows = (endpos - startpos)/(ncols*elemsiz);
149 if (fseek(fp, startpos, SEEK_SET) < 0) {
150 sprintf(errmsg,
151 "fseek() error on file '%s'",
152 fname);
153 error(SYSTEM, errmsg);
154 }
155 nrows = guessrows; /* we're confident */
156 }
157 }
158 cm = cm_alloc(guessrows, ncols);
159 } else
160 cm = cm_alloc(nrows, ncols);
161 if (cm == NULL)
162 return(NULL);
163 if (dtype == DTascii) { /* read text file */
164 int maxrow = (nrows > 0 ? nrows : 32000);
165 int r, c;
166 for (r = 0; r < maxrow; r++) {
167 if (r >= cm->nrows) /* need more space? */
168 cm = cm_resize(cm, 2*cm->nrows);
169 for (c = 0; c < ncols; c++) {
170 COLORV *cv = cm_lval(cm,r,c);
171 if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3)
172 if ((nrows <= 0) & (r > 0) & !c) {
173 cm = cm_resize(cm, maxrow=r);
174 break;
175 } else
176 goto EOFerror;
177 }
178 }
179 while ((c = getc(fp)) != EOF)
180 if (!isspace(c)) {
181 sprintf(errmsg,
182 "unexpected data at end of ascii file %s",
183 fname);
184 error(WARNING, errmsg);
185 break;
186 }
187 } else { /* read binary file */
188 if (sizeof(COLORV) == (dtype==DTfloat ? sizeof(float) :
189 sizeof(double))) {
190 int nread = 0;
191 do { /* read all we can */
192 nread += fread(cm->cmem + 3*nread,
193 3*sizeof(COLORV),
194 cm->nrows*cm->ncols - nread,
195 fp);
196 if (nrows <= 0) { /* unknown length */
197 if (nread == cm->nrows*cm->ncols)
198 /* need more space? */
199 cm = cm_resize(cm, 2*cm->nrows);
200 else if (nread && !(nread % cm->ncols))
201 /* seem to be done */
202 cm = cm_resize(cm, nread/cm->ncols);
203 else /* ended mid-row */
204 goto EOFerror;
205 } else if (nread < cm->nrows*cm->ncols)
206 goto EOFerror;
207 } while (nread < cm->nrows*cm->ncols);
208
209 } else if (dtype == DTdouble) {
210 double dc[3]; /* load from double */
211 COLORV *cvp = cm->cmem;
212 int n = nrows*ncols;
213
214 if (n <= 0)
215 goto not_handled;
216 while (n--) {
217 if (fread(dc, sizeof(double), 3, fp) != 3)
218 goto EOFerror;
219 copycolor(cvp, dc);
220 cvp += 3;
221 }
222 } else /* dtype == DTfloat */ {
223 float fc[3]; /* load from float */
224 COLORV *cvp = cm->cmem;
225 int n = nrows*ncols;
226
227 if (n <= 0)
228 goto not_handled;
229 while (n--) {
230 if (fread(fc, sizeof(float), 3, fp) != 3)
231 goto EOFerror;
232 copycolor(cvp, fc);
233 cvp += 3;
234 }
235 }
236 if (getc(fp) != EOF) {
237 sprintf(errmsg,
238 "unexpected data at end of binary file %s",
239 fname);
240 error(WARNING, errmsg);
241 }
242 }
243 if (fp != stdin)
244 fclose(fp);
245 return(cm);
246 EOFerror:
247 sprintf(errmsg, "unexpected EOF reading %s",
248 fname);
249 error(USER, errmsg);
250 not_handled:
251 error(INTERNAL, "unhandled data size or length in cm_load()");
252 return(NULL); /* gratis return */
253 }
254
255 /* Scale a matrix by a single value */
256 static CMATRIX *
257 cm_scale(const CMATRIX *cm1, const COLOR sca)
258 {
259 CMATRIX *cmr;
260 int dr, dc;
261
262 cmr = cm_alloc(cm1->nrows, cm1->ncols);
263 if (cmr == NULL)
264 return(NULL);
265 for (dr = 0; dr < cmr->nrows; dr++)
266 for (dc = 0; dc < cmr->ncols; dc++) {
267 const COLORV *sp = cm_lval(cm1,dr,dc);
268 COLORV *dp = cm_lval(cmr,dr,dc);
269 dp[0] = sp[0] * sca[0];
270 dp[1] = sp[1] * sca[1];
271 dp[2] = sp[2] * sca[2];
272 }
273 return(cmr);
274 }
275
276 /* Multiply two matrices (or a matrix and a vector) and allocate the result */
277 static CMATRIX *
278 cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2)
279 {
280 CMATRIX *cmr;
281 int dr, dc, i;
282
283 if ((cm1->ncols <= 0) | (cm1->ncols != cm2->nrows))
284 error(INTERNAL, "matrix dimension mismatch in cm_multiply()");
285 cmr = cm_alloc(cm1->nrows, cm2->ncols);
286 if (cmr == NULL)
287 return(NULL);
288 for (dr = 0; dr < cmr->nrows; dr++)
289 for (dc = 0; dc < cmr->ncols; dc++) {
290 COLORV *dp = cm_lval(cmr,dr,dc);
291 dp[0] = dp[1] = dp[2] = 0;
292 for (i = 0; i < cm1->ncols; i++) {
293 const COLORV *cp1 = cm_lval(cm1,dr,i);
294 const COLORV *cp2 = cm_lval(cm2,i,dc);
295 dp[0] += cp1[0] * cp2[0];
296 dp[1] += cp1[1] * cp2[1];
297 dp[2] += cp1[2] * cp2[2];
298 }
299 }
300 return(cmr);
301 }
302
303 /* print out matrix as ASCII text -- no header */
304 static void
305 cm_print(const CMATRIX *cm, FILE *fp)
306 {
307 int r, c;
308 const COLORV *mp = cm->cmem;
309
310 for (r = 0; r < cm->nrows; r++) {
311 for (c = 0; c < cm->ncols; c++, mp += 3)
312 fprintf(fp, "\t%.6e %.6e %.6e", mp[0], mp[1], mp[2]);
313 fputc('\n', fp);
314 }
315 }
316
317 /* Convert a BSDF to our matrix representation */
318 static CMATRIX *
319 cm_bsdf(const COLOR bsdfLamb, const COLOR specCol, const SDMat *bsdf)
320 {
321 CMATRIX *cm = cm_alloc(bsdf->nout, bsdf->ninc);
322 int nbadohm = 0;
323 int nneg = 0;
324 int r, c;
325 /* reciprocity is "transparent" */
326 for (c = 0; c < cm->ncols; c++) {
327 const double dom = mBSDF_incohm(bsdf,c);
328 /* projected solid angle */
329 nbadohm += (dom <= 0);
330
331 for (r = 0; r < cm->nrows; r++) {
332 float f = mBSDF_value(bsdf,c,r);
333 COLORV *mp = cm_lval(cm,r,c);
334 /* check BSDF value */
335 if ((f <= 0) | (dom <= 0)) {
336 nneg += (f < -FTINY);
337 f = .0f;
338 }
339 copycolor(mp, specCol);
340 scalecolor(mp, f);
341 addcolor(mp, bsdfLamb);
342 scalecolor(mp, dom);
343 }
344 }
345 if (nneg | nbadohm) {
346 sprintf(errmsg,
347 "BTDF has %d negatives and %d bad incoming solid angles",
348 nneg, nbadohm);
349 error(WARNING, errmsg);
350 }
351 return(cm);
352 }
353
354 /* Load and convert a matrix BSDF from the given XML file */
355 static CMATRIX *
356 cm_loadBSDF(char *fname, COLOR cLamb)
357 {
358 CMATRIX *Tmat;
359 char *fpath;
360 SDError ec;
361 SDData myBSDF;
362 COLOR bsdfLamb, specCol;
363 /* find path to BSDF file */
364 fpath = getpath(fname, getrlibpath(), R_OK);
365 if (fpath == NULL) {
366 sprintf(errmsg, "cannot find BSDF file '%s'", fname);
367 error(USER, errmsg);
368 }
369 SDclearBSDF(&myBSDF, fname); /* load XML and check type */
370 ec = SDloadFile(&myBSDF, fpath);
371 if (ec)
372 error(USER, transSDError(ec));
373 ccy2rgb(&myBSDF.tLamb.spec, myBSDF.tLamb.cieY/PI, bsdfLamb);
374 if (myBSDF.tf == NULL) { /* no non-Lambertian transmission? */
375 if (cLamb != NULL)
376 copycolor(cLamb, bsdfLamb);
377 SDfreeBSDF(&myBSDF);
378 return(NULL);
379 }
380 if (myBSDF.tf->ncomp != 1 || myBSDF.tf->comp[0].func != &SDhandleMtx) {
381 sprintf(errmsg, "unsupported BSDF '%s'", fpath);
382 error(USER, errmsg);
383 }
384 /* convert BTDF to matrix */
385 ccy2rgb(&myBSDF.tf->comp[0].cspec[0], 1., specCol);
386 Tmat = cm_bsdf(bsdfLamb, specCol, (SDMat *)myBSDF.tf->comp[0].dist);
387 if (cLamb != NULL) /* Lambertian is included */
388 setcolor(cLamb, .0, .0, .0);
389 /* free BSDF and return */
390 SDfreeBSDF(&myBSDF);
391 return(Tmat);
392 }
393
394 /* Sum together a set of images and write result to stdout */
395 static int
396 sum_images(const char *fspec, const CMATRIX *cv, FILE *fout)
397 {
398 int myDT = DTfromHeader;
399 CMATRIX *pmat;
400 COLOR *scanline;
401 int myXR, myYR;
402 int i, y;
403
404 if (cv->ncols != 1)
405 error(INTERNAL, "expected vector in sum_images()");
406 for (i = 0; i < cv->nrows; i++) {
407 const COLORV *scv = cv_lval(cv,i);
408 char fname[1024];
409 FILE *fp;
410 int dt, xr, yr;
411 COLORV *psp;
412 /* check for zero */
413 if ((scv[RED] == 0) & (scv[GRN] == 0) & (scv[BLU] == 0) &&
414 (myDT != DTfromHeader) | (i < cv->nrows-1))
415 continue;
416 /* open next picture */
417 sprintf(fname, fspec, i);
418 if ((fp = fopen(fname, "r")) == NULL) {
419 sprintf(errmsg, "cannot open picture '%s'", fname);
420 error(SYSTEM, errmsg);
421 }
422 SET_FILE_BINARY(fp);
423 dt = getDTfromHeader(fp);
424 if ((dt != DTrgbe) & (dt != DTxyze) ||
425 !fscnresolu(&xr, &yr, fp)) {
426 sprintf(errmsg, "file '%s' not a picture", fname);
427 error(USER, errmsg);
428 }
429 if (myDT == DTfromHeader) { /* on first one */
430 myDT = dt;
431 myXR = xr; myYR = yr;
432 scanline = (COLOR *)malloc(sizeof(COLOR)*myXR);
433 if (scanline == NULL)
434 error(SYSTEM, "out of memory in sum_images()");
435 pmat = cm_alloc(myYR, myXR);
436 memset(pmat->cmem, 0, sizeof(COLOR)*myXR*myYR);
437 /* finish header */
438 fputformat(myDT==DTrgbe ? COLRFMT : CIEFMT, fout);
439 fputc('\n', fout);
440 fprtresolu(myXR, myYR, fout);
441 fflush(fout);
442 } else if ((dt != myDT) | (xr != myXR) | (yr != myYR)) {
443 sprintf(errmsg, "picture '%s' format/size mismatch",
444 fname);
445 error(USER, errmsg);
446 }
447 psp = pmat->cmem;
448 for (y = 0; y < yr; y++) { /* read it in */
449 int x;
450 if (freadscan(scanline, xr, fp) < 0) {
451 sprintf(errmsg, "error reading picture '%s'",
452 fname);
453 error(SYSTEM, errmsg);
454 }
455 /* sum in scanline */
456 for (x = 0; x < xr; x++, psp += 3) {
457 multcolor(scanline[x], scv);
458 addcolor(psp, scanline[x]);
459 }
460 }
461 fclose(fp); /* done this picture */
462 }
463 free(scanline);
464 /* write scanlines */
465 for (y = 0; y < myYR; y++)
466 if (fwritescan((COLOR *)cm_lval(pmat, y, 0), myXR, fout) < 0)
467 return(0);
468 cm_free(pmat); /* all done */
469 return(fflush(fout) == 0);
470 }
471
472 /* check to see if a string contains a %d or %o specification */
473 static int
474 hasNumberFormat(const char *s)
475 {
476 while (*s) {
477 while (*s != '%')
478 if (!*s++)
479 return(0);
480 if (*++s == '%') { /* ignore "%%" */
481 ++s;
482 continue;
483 }
484 while (isdigit(*s)) /* field length */
485 ++s;
486 /* field we'll use? */
487 if ((*s == 'd') | (*s == 'i') | (*s == 'o') |
488 (*s == 'x') | (*s == 'X'))
489 return(1);
490 }
491 return(0); /* didn't find one */
492 }
493
494 int
495 main(int argc, char *argv[])
496 {
497 CMATRIX *cvec; /* component vector result */
498
499 progname = argv[0];
500
501 if ((argc < 2) | (argc > 5)) {
502 fprintf(stderr, "Usage: %s DCspec [tregvec]\n", progname);
503 fprintf(stderr, " or: %s Vspec Tbsdf.xml Dmat.dat [tregvec]\n",
504 progname);
505 return(1);
506 }
507
508 if (argc > 3) { /* VTDs expression */
509 CMATRIX *svec, *Dmat, *Tmat, *ivec;
510 COLOR tLamb;
511 /* get sky vector */
512 svec = cm_load(argv[4], 0, 1, DTascii);
513 /* load BSDF */
514 Tmat = cm_loadBSDF(argv[2], tLamb);
515 /* load Daylight matrix */
516 Dmat = cm_load(argv[3], Tmat==NULL ? 0 : Tmat->ncols,
517 svec->nrows, DTfromHeader);
518 /* multiply vector through */
519 ivec = cm_multiply(Dmat, svec);
520 cm_free(Dmat); cm_free(svec);
521 if (Tmat == NULL) { /* diffuse only */
522 cvec = cm_scale(ivec, tLamb);
523 } else { /* else apply BTDF matrix */
524 cvec = cm_multiply(Tmat, ivec);
525 cm_free(Tmat);
526 }
527 cm_free(ivec);
528 } else { /* else just use sky vector */
529 cvec = cm_load(argv[2], 0, 1, DTascii);
530 }
531
532 if (hasNumberFormat(argv[1])) { /* generating image */
533 SET_FILE_BINARY(stdout);
534 newheader("RADIANCE", stdout);
535 printargs(argc, argv, stdout);
536 fputnow(stdout);
537 if (!sum_images(argv[1], cvec, stdout))
538 return(1);
539 } else { /* generating vector */
540 CMATRIX *Vmat = cm_load(argv[1], 0, cvec->nrows, DTfromHeader);
541 CMATRIX *rvec = cm_multiply(Vmat, cvec);
542 cm_free(Vmat);
543 cm_print(rvec, stdout);
544 cm_free(rvec);
545 }
546 cm_free(cvec); /* final clean-up */
547 return(0);
548 }