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#include <u.h>
#include <libc.h>
#include <ctype.h>
#include <bio.h>
#include <draw.h>
#include "dat.h"
#include "fns.h"
Vector3 *verts;
Triangle3 *tris;
int nvert, ntri;
int lineno;
int
objread(char *f, Triangle3 **mesh)
{
Biobuf *bin;
char *s;
int idx;
double *coord;
Vector3 *vert;
bin = Bopen(f, OREAD);
if(bin == nil)
sysfatal("Bopen: %r");
while((s = Brdline(bin, '\n')) != nil){
lineno++;
if(*s == 'v'){
verts = erealloc(verts, ++nvert*sizeof(Vector3));
coord = (double *)(verts+nvert-1);
while(*s != '\n' && (Vector3 *)coord-verts < nvert){
while(isspace(*++s))
;
*coord++ = strtod(s, &s);
}
if(coord-(double *)(verts+nvert-1) < 3){
werrstr("%s:%d insufficient coordinates", f, lineno);
goto error;
}
}
if(*s == 'f'){
tris = erealloc(tris, ++ntri*sizeof(Triangle3));
vert = (Vector3 *)(tris+ntri-1);
while(*s != '\n' && (Triangle3 *)vert-tris < ntri){
while(isspace(*++s))
;
idx = strtol(s, &s, 0);
if(idx > nvert){
werrstr("%s:%d insufficient vertices", f, lineno);
goto error;
}
*vert++ = verts[idx-1];
}
}
}
*mesh = tris;
free(verts);
Bterm(bin);
return ntri;
error:
free(verts);
free(tris);
Bterm(bin);
return -1;
}
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