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/* Copyright (c) 1997 Silicon Graphics, Inc. */ |
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#ifndef lint |
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static char SCCSid[] = "$SunId$ SGI"; |
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static const char RCSid[] = "$Id$"; |
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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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#include "platform.h" |
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#include "standard.h" |
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#include "view.h" |
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#include "resolu.h" |
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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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extern int putf(), putd(), puta(); |
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static putfunc *putr = puta; |
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int (*putr)() = puta; |
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VIEW vw = STDVIEW; |
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RESOLU rs = {PIXSTANDARD, 512, 512}; |
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int zfd = -1; |
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int fromstdin = 0; |
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char *progname; |
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main(argc, argv) |
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int argc; |
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char *argv[]; |
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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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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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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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vw.vaft > FTINY ? '+' : '-'); |
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exit(0); |
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} |
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putrays(); |
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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 [ -f{a|f|d} | -d ] { view opts .. | picture [zbuf] }\n", |
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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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putrays() |
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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 FLOAT loc[2]; |
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static FVECT rorg, rdir; |
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float *zbuf; |
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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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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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static void |
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putrays(void) |
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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 = NULL; |
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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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} |
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if (zfd >= 0) |
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free((char *)zbuf); |
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free((void *)zbuf); |
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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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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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} |
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putf(ro, rd) /* put out ray in float format */ |
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FVECT ro, rd; |
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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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< |
putd(ro, rd) /* put out ray in double format */ |
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< |
FVECT ro, rd; |
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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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