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root/radiance/ray/src/util/dctimestep.c
Revision: 2.3
Committed: Fri Jun 19 14:21:42 2009 UTC (13 years, 5 months ago) by greg
Content type: text/plain
Branch: MAIN
Changes since 2.2: +26 -3 lines
Log Message:
Fixed conversion of BTDF to matrix

File Contents

# Content
1 #ifndef lint
2 static const char RCSid[] = "$Id: dctimestep.c,v 2.2 2009/06/19 06:49:42 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 "color.h"
14 #include "resolu.h"
15 #include "bsdf.h"
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);
61 return(NULL);
62 }
63 cm = (CMATRIX *)realloc(cm, sizeof(CMATRIX) +
64 3*sizeof(COLORV)*(nrows*cm->ncols - 1));
65 if (cm == NULL)
66 error(SYSTEM, "out of memory in cm_resize()");
67 cm->nrows = nrows;
68 return(cm);
69 }
70
71 /* Load header to obtain data type */
72 static int
73 getDT(char *s, void *p)
74 {
75 char fmt[32];
76
77 if (formatval(fmt, s)) {
78 if (!strcmp(fmt, "ascii"))
79 *((int *)p) = DTascii;
80 else if (!strcmp(fmt, "float"))
81 *((int *)p) = DTfloat;
82 else if (!strcmp(fmt, "double"))
83 *((int *)p) = DTdouble;
84 else if (!strcmp(fmt, COLRFMT))
85 *((int *)p) = DTrgbe;
86 else if (!strcmp(fmt, CIEFMT))
87 *((int *)p) = DTxyze;
88 }
89 return(0);
90 }
91
92 static int
93 getDTfromHeader(FILE *fp)
94 {
95 int dt = DTfromHeader;
96
97 if (getheader(fp, getDT, &dt) < 0)
98 error(SYSTEM, "header read error");
99 if (dt == DTfromHeader)
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)
112 fname = "<stdin>";
113 else if ((fp = fopen(fname, "r")) == NULL) {
114 sprintf(errmsg, "cannot open file '%s'", fname);
115 error(SYSTEM, errmsg);
116 }
117 if (dtype != DTascii)
118 SET_FILE_BINARY(fp);
119 if (dtype == DTfromHeader)
120 dtype = getDTfromHeader(fp);
121 switch (dtype) {
122 case DTascii:
123 case DTfloat:
124 case DTdouble:
125 break;
126 default:
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 }
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);
165 for (c = 0; c < ncols; c++) {
166 COLORV *cv = cm_lval(cm,r,c);
167 if (fscanf(fp, COLSPEC, cv, cv+1, cv+2) != 3)
168 if ((nrows <= 0) & (r > 0) & (c == 0)) {
169 cm = cm_resize(cm, maxrow=r);
170 break;
171 } else
172 goto EOFerror;
173 }
174 }
175 while ((c = getc(fp)) != EOF)
176 if (!isspace(c)) {
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))) {
186 int nread = 0;
187 do { /* read all we can */
188 nread += fread(cm->cmem + 3*nread,
189 3*sizeof(COLORV),
190 cm->nrows*cm->ncols - nread,
191 fp);
192 if (nrows <= 0) { /* unknown length */
193 if (nread == cm->nrows*cm->ncols)
194 /* need more space? */
195 cm = cm_resize(cm, 2*cm->nrows);
196 else if (nread % cm->ncols == 0)
197 /* seem to be done */
198 cm = cm_resize(cm, nread/cm->ncols);
199 else /* ended mid-row */
200 goto EOFerror;
201 } else if (nread < cm->nrows*cm->ncols)
202 goto EOFerror;
203 } while (nread < cm->nrows*cm->ncols);
204
205 } else if (dtype == DTdouble) {
206 double dc[3]; /* load from double */
207 COLORV *cvp = cm->cmem;
208 int n = nrows*ncols;
209
210 if (n <= 0)
211 goto not_handled;
212 while (n--) {
213 if (fread(dc, sizeof(double), 3, fp) != 3)
214 goto EOFerror;
215 copycolor(cvp, dc);
216 cvp += 3;
217 }
218 } else /* dtype == DTfloat */ {
219 float fc[3]; /* load from float */
220 COLORV *cvp = cm->cmem;
221 int n = nrows*ncols;
222
223 if (n <= 0)
224 goto not_handled;
225 while (n--) {
226 if (fread(fc, sizeof(float), 3, fp) != 3)
227 goto EOFerror;
228 copycolor(cvp, fc);
229 cvp += 3;
230 }
231 }
232 if (getc(fp) != EOF) {
233 sprintf(errmsg,
234 "unexpected data at end of binary file %s",
235 fname);
236 error(WARNING, errmsg);
237 }
238 }
239 if (fp != stdin)
240 fclose(fp);
241 return(cm);
242 EOFerror:
243 sprintf(errmsg, "unexpected EOF reading %s",
244 fname);
245 error(USER, errmsg);
246 not_handled:
247 error(INTERNAL, "unhandled data size or length in cm_load()");
248 return(NULL); /* gratis return */
249 }
250
251 /* Multiply two matrices (or a matrix and a vector) and allocate the result*/
252 static CMATRIX *
253 cm_multiply(const CMATRIX *cm1, const CMATRIX *cm2)
254 {
255 CMATRIX *cmr;
256 int dr, dc, i;
257
258 if ((cm1->ncols <= 0) | (cm1->ncols != cm2->nrows))
259 error(INTERNAL, "matrix dimension mismatch in cm_multiply()");
260 cmr = cm_alloc(cm1->nrows, cm2->ncols);
261 if (cmr == NULL)
262 return(NULL);
263 for (dr = 0; dr < cmr->nrows; dr++)
264 for (dc = 0; dc < cmr->ncols; dc++) {
265 COLORV *dp = cm_lval(cmr,dr,dc);
266 dp[0] = dp[1] = dp[2] = 0;
267 for (i = 0; i < cm1->ncols; i++) {
268 const COLORV *cp1 = cm_lval(cm1,dr,i);
269 const COLORV *cp2 = cm_lval(cm2,i,dc);
270 dp[0] += cp1[0] * cp2[0];
271 dp[1] += cp1[1] * cp2[1];
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)
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 *
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 (nbadohm | nneg) {
322 sprintf(errmsg,
323 "BTDF has %d negatives and %d bad incoming solid angles");
324 error(WARNING, errmsg);
325 }
326 return(cm);
327 }
328
329 /* Sum together a set of images and write result to stdout */
330 static int
331 sum_images(const char *fspec, const CMATRIX *cv)
332 {
333 int myDT = DTfromHeader;
334 CMATRIX *pmat;
335 COLOR *scanline;
336 int myXR, myYR;
337 int i, y;
338
339 if (cv->ncols != 1)
340 error(INTERNAL, "expected vector in sum_images()");
341 for (i = 0; i < cv->nrows; i++) {
342 const COLORV *scv = cv_lval(cv,i);
343 char fname[1024];
344 FILE *fp;
345 int dt, xr, yr;
346 COLORV *psp;
347 /* open next picture */
348 sprintf(fname, fspec, i);
349 if ((fp = fopen(fname, "r")) == NULL) {
350 sprintf(errmsg, "cannot open picture '%s'", fname);
351 error(SYSTEM, errmsg);
352 }
353 SET_FILE_BINARY(fp);
354 dt = getDTfromHeader(fp);
355 if ((dt != DTrgbe) & (dt != DTxyze) ||
356 !fscnresolu(&xr, &yr, fp)) {
357 sprintf(errmsg, "file '%s' not a picture", fname);
358 error(USER, errmsg);
359 }
360 if (myDT == DTfromHeader) { /* on first one */
361 myDT = dt;
362 myXR = xr; myYR = yr;
363 scanline = (COLOR *)malloc(sizeof(COLOR)*myXR);
364 if (scanline == NULL)
365 error(SYSTEM, "out of memory in sum_images()");
366 pmat = cm_alloc(myYR, myXR);
367 memset(pmat->cmem, 0, sizeof(COLOR)*myXR*myYR);
368 /* finish header */
369 fputformat(myDT==DTrgbe ? COLRFMT : CIEFMT, stdout);
370 fputc('\n', stdout);
371 fprtresolu(myXR, myYR, stdout);
372 fflush(stdout);
373 } else if ((dt != myDT) | (xr != myXR) | (yr != myYR)) {
374 sprintf(errmsg, "picture '%s' format/size mismatch",
375 fname);
376 error(USER, errmsg);
377 }
378 psp = pmat->cmem;
379 for (y = 0; y < yr; y++) { /* read it in */
380 int x;
381 if (freadscan(scanline, xr, fp) < 0) {
382 sprintf(errmsg, "error reading picture '%s'",
383 fname);
384 error(SYSTEM, errmsg);
385 }
386 /* sum in scanline */
387 for (x = 0; x < xr; x++, psp += 3) {
388 multcolor(scanline[x], scv);
389 addcolor(psp, scanline[x]);
390 }
391 }
392 fclose(fp); /* done this picture */
393 }
394 free(scanline);
395 /* write scanlines */
396 for (y = 0; y < myYR; y++)
397 if (fwritescan((COLOR *)cm_lval(pmat, y, 0), myXR, stdout) < 0)
398 return(0);
399 cm_free(pmat); /* all done */
400 return(fflush(stdout) == 0);
401 }
402
403 /* check to see if a string contains a %d specification */
404 int
405 hasDecimalSpec(const char *s)
406 {
407 while (*s && *s != '%')
408 s++;
409 if (!*s)
410 return(0);
411 do
412 ++s;
413 while (isdigit(*s));
414
415 return(*s == 'd');
416 }
417
418 int
419 main(int argc, char *argv[])
420 {
421 CMATRIX *tvec, *Dmat, *Tmat, *ivec, *cvec;
422 struct BSDF_data *btdf;
423
424 progname = argv[0];
425
426 if ((argc < 4) | (argc > 5)) {
427 fprintf(stderr, "Usage: %s Vspec Tbsdf.xml Dmat.dat [tregvec]\n",
428 progname);
429 return(1);
430 }
431 tvec = cm_load(argv[4], 0, 1, DTascii); /* argv[4]==NULL iff argc==4 */
432 Dmat = cm_load(argv[3], 0, tvec->nrows, DTfromHeader);
433 btdf = load_BSDF(argv[2]);
434 if (btdf == NULL)
435 return(1);
436 if (btdf->ninc != Dmat->nrows) {
437 sprintf(errmsg, "Incoming BTDF dir (%d) mismatch to D (%d)",
438 btdf->ninc, Dmat->nrows);
439 error(USER, errmsg);
440 }
441 /* multiply vector through */
442 ivec = cm_multiply(Dmat, tvec);
443 cm_free(Dmat); cm_free(tvec);
444 Tmat = cm_bsdf(btdf); /* convert BTDF to matrix */
445 free_BSDF(btdf);
446 cvec = cm_multiply(Tmat, ivec); /* cvec = component vector */
447 cm_free(Tmat); cm_free(ivec);
448 if (hasDecimalSpec(argv[1])) { /* generating image */
449 SET_FILE_BINARY(stdout);
450 newheader("RADIANCE", stdout);
451 printargs(argc, argv, stdout);
452 fputnow(stdout);
453 if (!sum_images(argv[1], cvec))
454 return(1);
455 } else { /* generating vector */
456 CMATRIX *Vmat = cm_load(argv[1], 0, cvec->nrows, DTfromHeader);
457 CMATRIX *rvec = cm_multiply(Vmat, cvec);
458 cm_free(Vmat);
459 cm_print(rvec, stdout);
460 cm_free(rvec);
461 }
462 cm_free(cvec); /* final clean-up */
463 return(0);
464 }