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#ifndef lint |
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static const char RCSid[] = "$Id: vwrays.c,v 3.25 2024/01/12 17:29:10 greg Exp $"; |
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#endif |
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/* |
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* Compute rays corresponding to a given picture or view. |
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*/ |
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|
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#include "platform.h" |
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#include "standard.h" |
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#include "random.h" |
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#include "view.h" |
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|
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typedef void putfunc(FVECT ro, FVECT rd); |
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static putfunc puta; |
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static putfunc putf; |
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static putfunc putd; |
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static void pix2rays(FILE *fp); |
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static void putrays(void); |
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|
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static putfunc *putr = puta; |
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|
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VIEW vw = STDVIEW; |
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|
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RESOLU rs = {PIXSTANDARD, 512, 512}; |
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|
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double pa = 1.; |
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|
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double pj = 0.; |
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|
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double pd = 0.; |
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|
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int zfd = -1; |
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|
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int fromstdin = 0; |
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|
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int unbuffered = 0; |
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|
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int repeatcnt = 1; |
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|
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|
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int |
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main( |
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int argc, |
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char *argv[] |
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) |
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{ |
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char *err; |
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int rval, getdim = 0; |
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int i; |
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|
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fixargv0(argv[0]); /* sets global progname */ |
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if (argc < 2) |
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goto userr; |
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for (i = 1; i < argc && argv[i][0] == '-'; i++) |
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switch (argv[i][1]) { |
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case 'f': /* output format */ |
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switch (argv[i][2]) { |
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case 'a': /* ASCII */ |
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putr = puta; |
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break; |
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case 'f': /* float */ |
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putr = putf; |
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SET_FILE_BINARY(stdout); |
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break; |
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case 'd': /* double */ |
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putr = putd; |
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SET_FILE_BINARY(stdout); |
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break; |
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default: |
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goto userr; |
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} |
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break; |
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case 'v': /* view file or option */ |
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if (argv[i][2] == 'f') { |
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rval = viewfile(argv[++i], &vw, NULL); |
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if (rval <= 0) { |
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fprintf(stderr, |
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"%s: no view in file\n", |
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argv[i]); |
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return(1); |
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} |
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break; |
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} |
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rval = getviewopt(&vw, argc-i, argv+i); |
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if (rval < 0) |
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goto userr; |
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i += rval; |
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break; |
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case 'd': /* report dimensions only */ |
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getdim++; |
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break; |
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case 'x': /* x resolution */ |
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rs.xr = atoi(argv[++i]); |
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if (rs.xr <= 0) { |
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fprintf(stderr, "%s: bad x resolution\n", |
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progname); |
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return(1); |
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} |
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break; |
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case 'y': /* y resolution */ |
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rs.yr = atoi(argv[++i]); |
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if (rs.yr <= 0) { |
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fprintf(stderr, "%s: bad y resolution\n", |
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progname); |
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return(1); |
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} |
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break; |
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case 'c': /* repeat count */ |
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repeatcnt = atoi(argv[++i]); |
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if (repeatcnt < 1) repeatcnt = 1; |
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break; |
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case 'p': /* pixel aspect or jitter */ |
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if (argv[i][2] == 'a') |
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pa = atof(argv[++i]); |
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else if (argv[i][2] == 'j') |
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pj = atof(argv[++i]); |
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else if (argv[i][2] == 'd') |
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pd = atof(argv[++i]); |
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else |
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goto userr; |
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break; |
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case 'i': /* get pixels from stdin */ |
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fromstdin = 1; |
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break; |
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case 'u': /* unbuffered output */ |
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unbuffered = 1; |
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break; |
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default: |
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goto userr; |
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} |
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if ((i > argc) | (i+2 < argc)) |
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goto userr; |
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if (i < argc) { |
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rval = viewfile(argv[i], &vw, &rs); |
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if (rval <= 0) { |
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fprintf(stderr, "%s: no view in picture\n", argv[i]); |
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return(1); |
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} |
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if (!getdim & (i+1 < argc)) { |
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zfd = open_float_depth(argv[i+1], (long)rs.xr*rs.yr); |
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if (zfd < 0) |
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return(1); |
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} |
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} |
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if ((err = setview(&vw)) != NULL) { |
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fprintf(stderr, "%s: %s\n", progname, err); |
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return(1); |
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} |
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if (i == argc) |
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normaspect(viewaspect(&vw), &pa, &rs.xr, &rs.yr); |
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if (getdim) { |
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printf("-x %d -y %d%s\n", rs.xr, rs.yr, |
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(vw.vaft > FTINY) ? " -ld+" : ""); |
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return(0); |
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} |
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if ((repeatcnt > 1) & (pj > FTINY)) |
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initurand(1024); |
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if (fromstdin) |
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pix2rays(stdin); |
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else |
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putrays(); |
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return(0); |
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userr: |
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fprintf(stderr, |
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"Usage: %s [ -i -u -f{a|f|d} -c rept | -d ] { view opts .. | picture [zbuf] }\n", |
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progname); |
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return(1); |
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} |
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|
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|
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static void |
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jitterloc( |
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RREAL loc[2] |
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) |
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{ |
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static int nsamp; |
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double xyr[2]; |
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|
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if (pj <= FTINY) |
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return; |
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|
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if (repeatcnt == 1) { |
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xyr[0] = frandom(); |
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xyr[1] = frandom(); |
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} else /* stratify samples */ |
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multisamp(xyr, 2, urand(nsamp++)); |
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|
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loc[0] += pj*(.5 - xyr[0])/rs.xr; |
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loc[1] += pj*(.5 - xyr[1])/rs.yr; |
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} |
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|
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|
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static void |
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pix2rays( |
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FILE *fp |
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) |
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{ |
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static FVECT rorg, rdir; |
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float zval; |
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double px, py; |
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RREAL loc[2]; |
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int pp[2]; |
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double d; |
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int i, c; |
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|
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while (fscanf(fp, "%lf %lf", &px, &py) == 2) { |
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px += .5; py += .5; |
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loc[0] = px/rs.xr; loc[1] = py/rs.yr; |
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if (zfd >= 0) { |
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if ((loc[0] < 0) | (loc[0] >= 1) | |
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(loc[1] < 0) | (loc[1] >= 1)) { |
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fprintf(stderr, "%s: input pixel outside image\n", |
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progname); |
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exit(1); |
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} |
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loc2pix(pp, &rs, loc[0], loc[1]); |
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if (lseek(zfd, |
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(pp[1]*scanlen(&rs)+pp[0])*sizeof(float), |
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SEEK_SET) < 0 || |
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read(zfd, &zval, sizeof(float)) |
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< sizeof(float)) { |
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fprintf(stderr, "%s: depth buffer read error\n", |
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progname); |
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exit(1); |
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} |
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} |
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for (c = repeatcnt; c-- > 0; ) { |
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jitterloc(loc); |
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d = viewray(rorg, rdir, &vw, loc[0], loc[1]); |
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if (d < -FTINY || !jitteraperture(rorg, rdir, &vw, pd)) |
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rorg[0] = rorg[1] = rorg[2] = |
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rdir[0] = rdir[1] = rdir[2] = 0.; |
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else if (zfd >= 0) |
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for (i = 0; i < 3; i++) { |
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rorg[i] += rdir[i]*zval; |
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rdir[i] = -rdir[i]; |
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} |
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else if (d > FTINY) { |
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rdir[0] *= d; rdir[1] *= d; rdir[2] *= d; |
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} |
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(*putr)(rorg, rdir); |
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if (c) { |
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loc[0] = px/rs.xr; loc[1] = py/rs.yr; |
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} |
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} |
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if (unbuffered) |
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fflush(stdout); |
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} |
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if (!feof(fp)) { |
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fprintf(stderr, "%s: expected px py on input\n", progname); |
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exit(1); |
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} |
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} |
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|
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|
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static void |
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putrays(void) |
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{ |
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RREAL loc[2]; |
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FVECT rorg, rdir; |
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float *zbuf = NULL; |
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int sc; |
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double d; |
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int si, i, c; |
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|
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if (zfd >= 0) { |
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zbuf = (float *)malloc(scanlen(&rs)*sizeof(float)); |
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if (zbuf == NULL) { |
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fprintf(stderr, "%s: not enough memory\n", progname); |
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exit(1); |
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} |
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} |
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for (sc = 0; sc < numscans(&rs); sc++) { |
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if (zfd >= 0) { |
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if (read(zfd, zbuf, scanlen(&rs)*sizeof(float)) < |
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scanlen(&rs)*sizeof(float)) { |
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fprintf(stderr, "%s: depth buffer read error\n", |
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progname); |
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exit(1); |
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} |
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} |
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for (si = 0; si < scanlen(&rs); si++) { |
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for (c = repeatcnt; c-- > 0; ) { |
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pix2loc(loc, &rs, si, sc); |
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jitterloc(loc); |
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d = viewray(rorg, rdir, &vw, loc[0], loc[1]); |
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if (d < -FTINY || !jitteraperture(rorg, rdir, &vw, pd)) |
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rorg[0] = rorg[1] = rorg[2] = |
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rdir[0] = rdir[1] = rdir[2] = 0.; |
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else if (zfd >= 0) |
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for (i = 0; i < 3; i++) { |
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rdir[i] = -rdir[i]*zbuf[si]; |
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rorg[i] -= rdir[i]; |
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} |
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else if (d > FTINY) { |
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rdir[0] *= d; rdir[1] *= d; rdir[2] *= d; |
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} |
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(*putr)(rorg, rdir); |
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} |
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} |
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} |
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if (zfd >= 0) |
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free((void *)zbuf); |
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} |
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|
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|
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static void |
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puta( /* put out ray in ASCII format */ |
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FVECT ro, |
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FVECT rd |
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) |
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{ |
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printf("%.5e %.5e %.5e %.5e %.5e %.5e\n", |
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ro[0], ro[1], ro[2], |
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rd[0], rd[1], rd[2]); |
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} |
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|
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|
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static void |
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putf( /* put out ray in float format */ |
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FVECT ro, |
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FVECT rd |
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) |
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{ |
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float v[6]; |
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|
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v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2]; |
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v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2]; |
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putbinary(v, sizeof(float), 6, stdout); |
| 330 |
} |
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|
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|
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static void |
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putd( /* put out ray in double format */ |
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FVECT ro, |
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FVECT rd |
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) |
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{ |
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double v[6]; |
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|
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v[0] = ro[0]; v[1] = ro[1]; v[2] = ro[2]; |
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v[3] = rd[0]; v[4] = rd[1]; v[5] = rd[2]; |
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putbinary(v, sizeof(double), 6, stdout); |
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} |
