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root/radiance/ray/src/util/dctimestep.c
Revision: 2.15
Committed: Fri Apr 8 18:13:48 2011 UTC (11 years, 8 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.14: +99 -34 lines
Log Message:
Changed dctimestep over to new BSDF interface and minor bug fixes

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: dctimestep.c,v 2.14 2011/04/03 03:06:19 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 /* Multiply two matrices (or a matrix and a vector) and allocate the result*/
256 static CMATRIX *
257 cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2)
258 {
259 CMATRIX *cmr;
260 int dr, dc, i;
261
262 if ((cm1->ncols <= 0) | (cm1->ncols != cm2->nrows))
263 error(INTERNAL, "matrix dimension mismatch in cm_multiply()");
264 cmr = cm_alloc(cm1->nrows, cm2->ncols);
265 if (cmr == NULL)
266 return(NULL);
267 for (dr = 0; dr < cmr->nrows; dr++)
268 for (dc = 0; dc < cmr->ncols; dc++) {
269 COLORV *dp = cm_lval(cmr,dr,dc);
270 dp[0] = dp[1] = dp[2] = 0;
271 for (i = 0; i < cm1->ncols; i++) {
272 const COLORV *cp1 = cm_lval(cm1,dr,i);
273 const COLORV *cp2 = cm_lval(cm2,i,dc);
274 dp[0] += cp1[0] * cp2[0];
275 dp[1] += cp1[1] * cp2[1];
276 dp[2] += cp1[2] * cp2[2];
277 }
278 }
279 return(cmr);
280 }
281
282 /* print out matrix as ASCII text -- no header */
283 static void
284 cm_print(const CMATRIX *cm, FILE *fp)
285 {
286 int r, c;
287 const COLORV *mp = cm->cmem;
288
289 for (r = 0; r < cm->nrows; r++) {
290 for (c = 0; c < cm->ncols; c++, mp += 3)
291 fprintf(fp, "\t%.6e %.6e %.6e", mp[0], mp[1], mp[2]);
292 fputc('\n', fp);
293 }
294 }
295
296 /* Convert a BSDF to our matrix representation */
297 static CMATRIX *
298 cm_bsdf(const COLOR bsdfLamb, const COLOR specCol, const SDMat *bsdf)
299 {
300 CMATRIX *cm;
301 int nbadohm = 0;
302 int nneg = 0;
303 FVECT v;
304 float dom;
305 int doforward;
306 int r, c;
307
308 mBSDF_incvec(v, bsdf, .5); /* check BTDF orientation */
309
310 if (v[2] < 0) { /* incident from outside */
311 cm = cm_alloc(bsdf->nout, bsdf->ninc);
312 for (c = 0; c < cm->ncols; c++) {
313 dom = mBSDF_incohm(bsdf,c);
314
315 nbadohm += (dom <= 0);
316
317 if (!mBSDF_incvec(v,bsdf,c+.5) || v[2] > 0)
318 error(USER, "illegal incoming BTDF direction");
319 dom *= -v[2];
320
321 for (r = 0; r < cm->nrows; r++) {
322 float f = mBSDF_value(bsdf,c,r);
323 COLORV *mp = cm_lval(cm,r,c);
324
325 if ((f <= 0) | (dom <= 0)) {
326 nneg += (f < -FTINY);
327 f = .0f;
328 }
329 copycolor(mp, specCol);
330 f *= dom;
331 scalecolor(mp, f);
332 addcolor(mp, bsdfLamb);
333 }
334 }
335 } else { /* rely on reciprocity */
336 cm = cm_alloc(bsdf->ninc, bsdf->nout);
337 for (c = 0; c < cm->ncols; c++) {
338 dom = mBSDF_outohm(bsdf,c);
339
340 nbadohm += (dom <= 0);
341
342 if (!mBSDF_outvec(v,bsdf,c+.5) || v[2] > 0)
343 error(USER, "illegal outgoing BTDF direction");
344 dom *= -v[2];
345
346 for (r = 0; r < cm->nrows; r++) {
347 float f = mBSDF_value(bsdf,r,c);
348 COLORV *mp = cm_lval(cm,r,c);
349
350 if ((f <= 0) | (dom <= 0)) {
351 nneg += (f < -FTINY);
352 f = .0f;
353 }
354 copycolor(mp, specCol);
355 f *= dom;
356 scalecolor(mp, f);
357 addcolor(mp, bsdfLamb);
358 }
359 }
360 }
361 if (nneg | nbadohm) {
362 sprintf(errmsg,
363 "BTDF has %d negatives and %d bad incoming solid angles",
364 nneg, nbadohm);
365 error(WARNING, errmsg);
366 }
367 return(cm);
368 }
369
370 /* Load and convert a matrix BSDF from the given XML file */
371 static CMATRIX *
372 cm_loadBSDF(char *fname)
373 {
374 CMATRIX *Tmat;
375 char *fpath;
376 SDError ec;
377 SDData myBSDF;
378 COLOR bsdfLamb, specCol;
379 /* find path to BSDF file */
380 fpath = getpath(fname, getrlibpath(), R_OK);
381 if (fpath == NULL) {
382 sprintf(errmsg, "cannot find BSDF file '%s'", fname);
383 error(USER, errmsg);
384 }
385 SDclipName(myBSDF.name, fname);
386 /* load XML and check type */
387 ec = SDloadFile(&myBSDF, fpath);
388 if (ec)
389 error(USER, transSDError(ec));
390 if (myBSDF.tf == NULL || myBSDF.tf->ncomp != 1 ||
391 myBSDF.tf->comp[0].func != &SDhandleMtx) {
392 sprintf(errmsg, "unsupported BSDF '%s'", fpath);
393 error(USER, errmsg);
394 }
395 /* convert BTDF to matrix */
396 ccy2rgb(&myBSDF.tLamb.spec, myBSDF.tLamb.cieY/PI, bsdfLamb);
397 ccy2rgb(&myBSDF.tf->comp[0].cspec[0], 1., specCol);
398 Tmat = cm_bsdf(bsdfLamb, specCol, (SDMat *)myBSDF.tf->comp[0].dist);
399 /* free BSDF and return */
400 SDfreeBSDF(&myBSDF);
401 return(Tmat);
402 }
403
404 /* Sum together a set of images and write result to stdout */
405 static int
406 sum_images(const char *fspec, const CMATRIX *cv, FILE *fout)
407 {
408 int myDT = DTfromHeader;
409 CMATRIX *pmat;
410 COLOR *scanline;
411 int myXR, myYR;
412 int i, y;
413
414 if (cv->ncols != 1)
415 error(INTERNAL, "expected vector in sum_images()");
416 for (i = 0; i < cv->nrows; i++) {
417 const COLORV *scv = cv_lval(cv,i);
418 char fname[1024];
419 FILE *fp;
420 int dt, xr, yr;
421 COLORV *psp;
422 /* check for zero */
423 if ((scv[RED] == 0) & (scv[GRN] == 0) & (scv[BLU] == 0))
424 continue;
425 /* open next picture */
426 sprintf(fname, fspec, i);
427 if ((fp = fopen(fname, "r")) == NULL) {
428 sprintf(errmsg, "cannot open picture '%s'", fname);
429 error(SYSTEM, errmsg);
430 }
431 SET_FILE_BINARY(fp);
432 dt = getDTfromHeader(fp);
433 if ((dt != DTrgbe) & (dt != DTxyze) ||
434 !fscnresolu(&xr, &yr, fp)) {
435 sprintf(errmsg, "file '%s' not a picture", fname);
436 error(USER, errmsg);
437 }
438 if (myDT == DTfromHeader) { /* on first one */
439 myDT = dt;
440 myXR = xr; myYR = yr;
441 scanline = (COLOR *)malloc(sizeof(COLOR)*myXR);
442 if (scanline == NULL)
443 error(SYSTEM, "out of memory in sum_images()");
444 pmat = cm_alloc(myYR, myXR);
445 memset(pmat->cmem, 0, sizeof(COLOR)*myXR*myYR);
446 /* finish header */
447 fputformat(myDT==DTrgbe ? COLRFMT : CIEFMT, fout);
448 fputc('\n', fout);
449 fprtresolu(myXR, myYR, fout);
450 fflush(fout);
451 } else if ((dt != myDT) | (xr != myXR) | (yr != myYR)) {
452 sprintf(errmsg, "picture '%s' format/size mismatch",
453 fname);
454 error(USER, errmsg);
455 }
456 psp = pmat->cmem;
457 for (y = 0; y < yr; y++) { /* read it in */
458 int x;
459 if (freadscan(scanline, xr, fp) < 0) {
460 sprintf(errmsg, "error reading picture '%s'",
461 fname);
462 error(SYSTEM, errmsg);
463 }
464 /* sum in scanline */
465 for (x = 0; x < xr; x++, psp += 3) {
466 multcolor(scanline[x], scv);
467 addcolor(psp, scanline[x]);
468 }
469 }
470 fclose(fp); /* done this picture */
471 }
472 free(scanline);
473 /* write scanlines */
474 for (y = 0; y < myYR; y++)
475 if (fwritescan((COLOR *)cm_lval(pmat, y, 0), myXR, fout) < 0)
476 return(0);
477 cm_free(pmat); /* all done */
478 return(fflush(fout) == 0);
479 }
480
481 /* check to see if a string contains a %d or %o specification */
482 static int
483 hasNumberFormat(const char *s)
484 {
485 while (*s && *s != '%')
486 s++;
487 if (!*s)
488 return(0);
489 do
490 ++s;
491 while (isdigit(*s));
492
493 return((*s == 'd') | (*s == 'i') | (*s == 'o') |
494 (*s == 'x') | (*s == 'X'));
495 }
496
497 int
498 main(int argc, char *argv[])
499 {
500 CMATRIX *cvec;
501
502 progname = argv[0];
503
504 if ((argc < 2) | (argc > 5)) {
505 fprintf(stderr, "Usage: %s DCspec [tregvec]\n", progname);
506 fprintf(stderr, " or: %s Vspec Tbsdf.xml Dmat.dat [tregvec]\n",
507 progname);
508 return(1);
509 }
510
511 if (argc > 3) { /* VTDs expression */
512 CMATRIX *svec, *Dmat, *Tmat, *ivec;
513 /* get sky vector */
514 svec = cm_load(argv[4], 0, 1, DTascii);
515 /* load BSDF */
516 Tmat = cm_loadBSDF(argv[2]);
517 /* load Daylight matrix */
518 Dmat = cm_load(argv[3], Tmat->ncols, svec->nrows, DTfromHeader);
519 /* multiply vector through */
520 ivec = cm_multiply(Dmat, svec);
521 cm_free(Dmat); cm_free(svec);
522 cvec = cm_multiply(Tmat, ivec); /* cvec = component vector */
523 cm_free(Tmat); cm_free(ivec);
524 } else { /* else just use sky vector */
525 cvec = cm_load(argv[2], 0, 1, DTascii);
526 }
527
528 if (hasNumberFormat(argv[1])) { /* generating image */
529 SET_FILE_BINARY(stdout);
530 newheader("RADIANCE", stdout);
531 printargs(argc, argv, stdout);
532 fputnow(stdout);
533 if (!sum_images(argv[1], cvec, stdout))
534 return(1);
535 } else { /* generating vector */
536 CMATRIX *Vmat = cm_load(argv[1], 0, cvec->nrows, DTfromHeader);
537 CMATRIX *rvec = cm_multiply(Vmat, cvec);
538 cm_free(Vmat);
539 cm_print(rvec, stdout);
540 cm_free(rvec);
541 }
542 cm_free(cvec); /* final clean-up */
543 return(0);
544 }