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#ifndef lint |
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static const char RCSid[] = "$Id: vwrays.c,v 3.8 2003/10/20 16:01:55 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 "view.h" |
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|
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extern int putf(), putd(), puta(); |
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|
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int (*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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int zfd = -1; |
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|
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int fromstdin = 0; |
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|
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char *progname; |
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|
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|
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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{ |
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char *err; |
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int rval, getdim = 0; |
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register int i; |
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|
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progname = argv[0]; |
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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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break; |
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case 'd': /* double */ |
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putr = putd; |
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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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exit(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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exit(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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exit(1); |
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} |
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break; |
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case 'p': /* pixel aspect ratio */ |
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pa = atof(argv[++i]); |
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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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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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exit(1); |
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} |
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if (i+1 < argc) { |
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zfd = open(argv[i+1], O_RDONLY); |
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if (zfd < 0) { |
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fprintf(stderr, |
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"%s: cannot open depth buffer\n", |
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argv[i+1]); |
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exit(1); |
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} |
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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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exit(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 -ld%c\n", rs.xr, rs.yr, |
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vw.vaft > FTINY ? '+' : '-'); |
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exit(0); |
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} |
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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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exit(0); |
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userr: |
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fprintf(stderr, |
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"Usage: %s [ -i -f{a|f|d} | -d ] { view opts .. | picture [zbuf] }\n", |
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progname); |
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exit(1); |
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} |
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|
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|
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pix2rays(FILE *fp) |
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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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int pp[2]; |
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double d; |
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register int i; |
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|
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while (fscanf(fp, "%lf %lf", &px, &py) == 2) { |
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if (px < 0 || px >= rs.xr || |
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py < 0 || py >= rs.yr) { |
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fprintf(stderr, |
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"%s: (x,y) pair (%.0f,%.0f) out of range\n", |
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progname, px, py); |
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exit(1); |
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} |
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if (zfd >= 0) { |
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loc2pix(pp, &rs, px/rs.xr, py/rs.yr); |
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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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d = viewray(rorg, rdir, &vw, px/rs.xr, py/rs.yr); |
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if (d < -FTINY) |
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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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} |
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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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putrays() |
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{ |
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static RREAL loc[2]; |
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static FVECT rorg, rdir; |
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float *zbuf; |
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int sc; |
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double d; |
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register int si, i; |
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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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pix2loc(loc, &rs, si, sc); |
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d = viewray(rorg, rdir, &vw, loc[0], loc[1]); |
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if (d < -FTINY) |
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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]*zbuf[si]; |
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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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} |
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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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puta(ro, rd) /* put out ray in ASCII format */ |
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FVECT ro, rd; |
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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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putf(ro, rd) /* put out ray in float format */ |
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FVECT ro, rd; |
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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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fwrite(v, sizeof(float), 6, stdout); |
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} |
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|
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|
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putd(ro, rd) /* put out ray in double format */ |
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FVECT ro, rd; |
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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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fwrite(v, sizeof(double), 6, stdout); |
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} |
