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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

# User Rev Content
1 greg 2.1 #ifndef lint
2 greg 2.15 static const char RCSid[] = "$Id: dctimestep.c,v 2.14 2011/04/03 03:06:19 greg Exp $";
3 greg 2.1 #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 greg 2.15 #include "paths.h"
14 greg 2.1 #include "color.h"
15     #include "resolu.h"
16     #include "bsdf.h"
17 greg 2.15 #include "bsdf_m.h"
18 greg 2.1
19     char *progname; /* global argv[0] */
20    
21 greg 2.2 /* Data types for file loading */
22 greg 2.1 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 greg 2.10 error(USER, "attempt to create empty matrix");
44 greg 2.1 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 greg 2.12 if (ncols <= 0)
114     error(USER, "Non-positive number of columns");
115 greg 2.1 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 greg 2.2
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 greg 2.1 if (fseek(fp, startpos, SEEK_SET) < 0) {
150     sprintf(errmsg,
151     "fseek() error on file '%s'",
152     fname);
153     error(SYSTEM, errmsg);
154     }
155 greg 2.2 nrows = guessrows; /* we're confident */
156 greg 2.1 }
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 greg 2.6 if (r >= cm->nrows) /* need more space? */
168 greg 2.1 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 greg 2.6 if ((nrows <= 0) & (r > 0) & !c) {
173 greg 2.1 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 greg 2.6 else if (nread && !(nread % cm->ncols))
201 greg 2.1 /* 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 greg 2.15 /* Convert a BSDF to our matrix representation */
297 greg 2.1 static CMATRIX *
298 greg 2.15 cm_bsdf(const COLOR bsdfLamb, const COLOR specCol, const SDMat *bsdf)
299 greg 2.1 {
300 greg 2.15 CMATRIX *cm;
301 greg 2.3 int nbadohm = 0;
302     int nneg = 0;
303 greg 2.15 FVECT v;
304     float dom;
305     int doforward;
306 greg 2.1 int r, c;
307 greg 2.15
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 greg 2.7 }
335 greg 2.15 } 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 greg 2.3 }
359     }
360 greg 2.7 }
361 greg 2.15 if (nneg | nbadohm) {
362 greg 2.3 sprintf(errmsg,
363 greg 2.4 "BTDF has %d negatives and %d bad incoming solid angles",
364     nneg, nbadohm);
365 greg 2.3 error(WARNING, errmsg);
366     }
367 greg 2.1 return(cm);
368     }
369    
370 greg 2.15 /* 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 greg 2.1 /* Sum together a set of images and write result to stdout */
405     static int
406 greg 2.13 sum_images(const char *fspec, const CMATRIX *cv, FILE *fout)
407 greg 2.1 {
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 greg 2.14 /* check for zero */
423 greg 2.15 if ((scv[RED] == 0) & (scv[GRN] == 0) & (scv[BLU] == 0))
424 greg 2.14 continue;
425 greg 2.1 /* 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 greg 2.2 /* finish header */
447 greg 2.13 fputformat(myDT==DTrgbe ? COLRFMT : CIEFMT, fout);
448     fputc('\n', fout);
449     fprtresolu(myXR, myYR, fout);
450     fflush(fout);
451 greg 2.1 } 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 greg 2.13 if (fwritescan((COLOR *)cm_lval(pmat, y, 0), myXR, fout) < 0)
476 greg 2.1 return(0);
477     cm_free(pmat); /* all done */
478 greg 2.13 return(fflush(fout) == 0);
479 greg 2.1 }
480    
481 greg 2.11 /* check to see if a string contains a %d or %o specification */
482     static int
483     hasNumberFormat(const char *s)
484 greg 2.1 {
485     while (*s && *s != '%')
486     s++;
487     if (!*s)
488     return(0);
489     do
490     ++s;
491     while (isdigit(*s));
492    
493 greg 2.15 return((*s == 'd') | (*s == 'i') | (*s == 'o') |
494     (*s == 'x') | (*s == 'X'));
495 greg 2.1 }
496    
497     int
498     main(int argc, char *argv[])
499     {
500 greg 2.12 CMATRIX *cvec;
501 greg 2.1
502     progname = argv[0];
503    
504 greg 2.12 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 greg 2.1 return(1);
509     }
510 greg 2.12
511 greg 2.13 if (argc > 3) { /* VTDs expression */
512 greg 2.12 CMATRIX *svec, *Dmat, *Tmat, *ivec;
513     /* get sky vector */
514     svec = cm_load(argv[4], 0, 1, DTascii);
515     /* load BSDF */
516 greg 2.15 Tmat = cm_loadBSDF(argv[2]);
517 greg 2.5 /* load Daylight matrix */
518 greg 2.15 Dmat = cm_load(argv[3], Tmat->ncols, svec->nrows, DTfromHeader);
519 greg 2.1 /* multiply vector through */
520 greg 2.12 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 greg 2.11 if (hasNumberFormat(argv[1])) { /* generating image */
529 greg 2.1 SET_FILE_BINARY(stdout);
530     newheader("RADIANCE", stdout);
531     printargs(argc, argv, stdout);
532     fputnow(stdout);
533 greg 2.12 if (!sum_images(argv[1], cvec, stdout))
534 greg 2.1 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     }