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#include "copyright.h" |
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#include "standard.h" |
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#include "cvmesh.h" |
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#include "triangulate.h" |
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#include <ctype.h> |
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typedef int VNDX[3]; /* vertex index (point,map,normal) */ |
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#define CHUNKSIZ 1024 /* vertex allocation chunk size */ |
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#define MAXARG 64 /* maximum # arguments in a statement */ |
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#define MAXARG 512 /* maximum # arguments in a statement */ |
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|
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static FVECT *vlist; /* our vertex list */ |
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static int nvs; /* number of vertices in our list */ |
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static FVECT *vnlist; /* vertex normal list */ |
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static int nvns; |
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static FLOAT (*vtlist)[2]; /* map vertex list */ |
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static RREAL (*vtlist)[2]; /* map vertex list */ |
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static int nvts; |
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|
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static char *inpfile; /* input file name */ |
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static int havemats; /* materials available? */ |
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static char material[64]; /* current material name */ |
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static char group[64]; /* current group name */ |
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static char material[256]; /* current material name */ |
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static char group[256]; /* current group name */ |
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static int lineno; /* current line number */ |
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static int faceno; /* current face number */ |
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|
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static int getstmt(); |
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static int cvtndx(); |
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static OBJECT getmod(); |
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static int putface(); |
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static int puttri(); |
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static void freeverts(); |
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static int newv(); |
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static int newvn(); |
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static int newvt(); |
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static void syntax(); |
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static int getstmt(char *av[MAXARG], FILE *fp); |
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static int cvtndx(VNDX vi, char *vs); |
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static int putface(int ac, char **av); |
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static OBJECT getmod(void); |
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static int puttri(char *v1, char *v2, char *v3); |
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static void freeverts(void); |
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static int newv(double x, double y, double z); |
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static int newvn(double x, double y, double z); |
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static int newvt(double x, double y); |
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static void syntax(char *er); |
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void |
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wfreadobj(objfn) /* read in .OBJ file and convert */ |
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char *objfn; |
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wfreadobj( /* read in .OBJ file and convert */ |
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char *objfn |
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) |
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{ |
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FILE *fp; |
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char *argv[MAXARG]; |
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int argc; |
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int nstats, nunknown; |
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int i; |
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|
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if (objfn == NULL) { |
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inpfile = "<stdin>"; |
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group[0] = '\0'; |
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lineno = 0; faceno = 0; |
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/* scan until EOF */ |
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while (argc = getstmt(argv, fp)) { |
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while ( (argc = getstmt(argv, fp)) ) { |
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switch (argv[0][0]) { |
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case 'v': /* vertex */ |
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switch (argv[0][1]) { |
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static int |
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getstmt(av, fp) /* read the next statement from fp */ |
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register char *av[MAXARG]; |
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FILE *fp; |
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getstmt( /* read the next statement from fp */ |
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char *av[MAXARG], |
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FILE *fp |
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) |
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{ |
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static char sbuf[MAXARG*16]; |
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register char *cp; |
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register int i; |
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char *cp; |
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int i; |
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|
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do { |
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if (fgetline(cp=sbuf, sizeof(sbuf), fp) == NULL) |
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lineno++; |
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*cp++ = '\0'; |
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} |
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if (!*cp || i >= MAXARG-1) |
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if (!*cp) |
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break; |
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if (i >= MAXARG-1) { |
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sprintf(errmsg, |
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"%s: too many arguments near line %d (limit %d)\n", |
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inpfile, lineno+1, MAXARG-1); |
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break; |
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} |
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av[i++] = cp; |
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while (*++cp && !isspace(*cp)) |
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; |
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static int |
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cvtndx(vi, vs) /* convert vertex string to index */ |
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register VNDX vi; |
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register char *vs; |
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cvtndx( /* convert vertex string to index */ |
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VNDX vi, |
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char *vs |
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) |
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{ |
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/* get point */ |
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vi[0] = atoi(vs); |
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return(1); |
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} |
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/* determine dominant axis for triangle */ |
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static int |
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dominant_axis(char *v1, char *v2, char *v3) |
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{ |
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VNDX v1i, v2i, v3i; |
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FVECT e1, e2, vn; |
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int i, imax; |
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if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) |
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return(-1); |
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VSUB(e1, vlist[v2i[0]], vlist[v1i[0]]); |
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VSUB(e2, vlist[v3i[0]], vlist[v2i[0]]); |
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VCROSS(vn, e1, e2); |
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for (i = imax = 2; i--; ) |
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if (vn[i]*vn[i] > vn[imax]*vn[imax]) |
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imax = i; |
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return(vn[imax]*vn[imax] > FTINY*FTINY*FTINY*FTINY ? imax : -1); |
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} |
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|
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/* struct needed for triangulation callback */ |
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typedef struct { |
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char **avl; |
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int rev; |
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} WFpoly; |
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|
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/* callback for triangle output from polygon */ |
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static int |
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putface(ac, av) /* put out an N-sided polygon */ |
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int ac; |
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register char **av; |
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tri_out(const Vert2_list *tp, int a, int b, int c) |
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{ |
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char *cp; |
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register int i; |
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WFpoly * wp = (WFpoly *)tp->p; |
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while (ac > 3) { /* break into triangles */ |
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if (!puttri(av[0], av[1], av[2])) |
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if (wp->rev) |
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return( puttri(wp->avl[c], wp->avl[b], wp->avl[a]) ); |
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|
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return( puttri(wp->avl[a], wp->avl[b], wp->avl[c]) ); |
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} |
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|
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static int |
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putface( /* put out an N-sided polygon */ |
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int ac, |
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char **av |
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) |
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{ |
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Vert2_list *poly; |
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WFpoly myps; |
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int i, ax, ay; |
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|
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for (i = ac-3; i >= 0; i--) /* identify dominant axis */ |
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if ((ax = dominant_axis(av[i], av[i+1], av[i+2])) >= 0) |
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break; |
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if (ax < 0) |
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return(1); /* ignore degenerate face */ |
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poly = polyAlloc(ac); |
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if (poly == NULL) |
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return(0); |
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myps.avl = av; |
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poly->p = &myps; |
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if (++ax >= 3) ax = 0; |
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ay = ax; |
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if (++ay >= 3) ay = 0; |
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for (i = 0; i < ac; i++) { /* convert to 2-D polygon */ |
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VNDX vi; |
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if (!cvtndx(vi, av[i])) { |
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error(WARNING, "bad vertex reference"); |
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polyFree(poly); |
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return(0); |
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ac--; /* remove vertex & rotate */ |
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cp = av[0]; |
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for (i = 0; i < ac-1; i++) |
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av[i] = av[i+2]; |
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av[i] = cp; |
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} |
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poly->v[i].mX = vlist[vi[0]][ax]; |
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poly->v[i].mY = vlist[vi[0]][ay]; |
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} |
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return(puttri(av[0], av[1], av[2])); |
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/* flag for order reversal */ |
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myps.rev = (polyArea(poly) < .0); |
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/* break into triangles & output */ |
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if (!polyTriangulate(poly, &tri_out)) { |
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sprintf(errmsg, "self-intersecting face with %d vertices", ac); |
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error(WARNING, errmsg); |
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} |
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polyFree(poly); |
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return(1); |
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} |
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static OBJECT |
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getmod() /* get current modifier ID */ |
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getmod(void) /* get current modifier ID */ |
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{ |
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char *mnam; |
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OBJECT mod; |
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static int |
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puttri(v1, v2, v3) /* convert a triangle */ |
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char *v1, *v2, *v3; |
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puttri( /* convert a triangle */ |
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char *v1, |
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char *v2, |
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char *v3 |
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) |
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{ |
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VNDX v1i, v2i, v3i; |
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FLOAT *v1c, *v2c, *v3c; |
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FLOAT *v1n, *v2n, *v3n; |
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RREAL *v1c, *v2c, *v3c; |
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RREAL *v1n, *v2n, *v3n; |
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|
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if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) |
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if (!cvtndx(v1i, v1) || !cvtndx(v2i, v2) || !cvtndx(v3i, v3)) { |
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error(WARNING, "bad vertex reference"); |
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return(0); |
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|
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} |
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if (v1i[1]>=0 && v2i[1]>=0 && v3i[1]>=0) { |
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v1c = vtlist[v1i[1]]; |
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v2c = vtlist[v2i[1]]; |
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static void |
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freeverts() /* free all vertices */ |
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freeverts(void) /* free all vertices */ |
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{ |
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if (nvs) { |
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free((void *)vlist); |
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|
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static int |
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newv(x, y, z) /* create a new vertex */ |
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double x, y, z; |
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newv( /* create a new vertex */ |
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double x, |
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double y, |
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double z |
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) |
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{ |
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if (!(nvs%CHUNKSIZ)) { /* allocate next block */ |
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if (nvs == 0) |
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|
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static int |
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newvn(x, y, z) /* create a new vertex normal */ |
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double x, y, z; |
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newvn( /* create a new vertex normal */ |
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double x, |
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double y, |
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double z |
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) |
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{ |
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if (!(nvns%CHUNKSIZ)) { /* allocate next block */ |
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if (nvns == 0) |
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static int |
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newvt(x, y) /* create a new texture map vertex */ |
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double x, y; |
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newvt( /* create a new texture map vertex */ |
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double x, |
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double y |
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) |
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{ |
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if (!(nvts%CHUNKSIZ)) { /* allocate next block */ |
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if (nvts == 0) |
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vtlist = (FLOAT (*)[2])malloc(CHUNKSIZ*2*sizeof(FLOAT)); |
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vtlist = (RREAL (*)[2])malloc(CHUNKSIZ*2*sizeof(RREAL)); |
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else |
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vtlist = (FLOAT (*)[2])realloc((void *)vtlist, |
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(nvts+CHUNKSIZ)*2*sizeof(FLOAT)); |
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vtlist = (RREAL (*)[2])realloc((void *)vtlist, |
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(nvts+CHUNKSIZ)*2*sizeof(RREAL)); |
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if (vtlist == NULL) |
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error(SYSTEM, "out of memory in newvt"); |
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} |
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|
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static void |
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syntax(er) /* report syntax error and exit */ |
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char *er; |
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syntax( /* report syntax error and exit */ |
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char *er |
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) |
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{ |
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sprintf(errmsg, "%s: Wavefront syntax error near line %d: %s\n", |
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sprintf(errmsg, "%s: Wavefront syntax error near line %d: %s", |
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inpfile, lineno, er); |
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error(USER, errmsg); |
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} |