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/*
* obj2model.c
*
* Turn Wavefront OBJ files into Thrust3D models
*
* (c) 2008 Thomas White <taw27@cam.ac.uk>
*
* thrust3d - a silly game
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "utils.c"
#define MAX_VERTICES 65536
int main(int argc, char *argv[]) {
FILE *fh;
FILE *out;
float vtmp[3*MAX_VERTICES];
float vntmp[3*MAX_VERTICES];
float textmp[2*MAX_VERTICES];
int v_used[MAX_VERTICES];
int vn_used[MAX_VERTICES];
int tex_used[MAX_VERTICES];
int n_vtmp, n_vntmp, n_textmp;
int nprev;
int i, v_unused, vn_unused, tex_unused;
fh = fopen(argv[1], "r");
if ( fh == NULL ) {
fprintf(stderr, "Couldn't open '%s'\n", argv[1]);
return 1;
}
for ( i=0; i<MAX_VERTICES; i++ ) {
v_used[i] = 5;
vn_used[i] = 5;
tex_used[i] = 5;
}
/* Zip through and find all the vertices */
n_vtmp = 0;
n_textmp = 0;
n_vntmp = 0;
while ( !feof(fh) ) {
char line[1024];
float x, y, z;
size_t s;
fgets(line, 1023, fh);
s = 0;
for ( ; s<strlen(line); s++ ) {
if ( line[s] != ' ' ) break;
}
if ( line[s] == '#' ) {
continue;
}
if ( sscanf(line+s, "v %f %f %f\n", &x, &y, &z) == 3 ) {
vtmp[3*n_vtmp+0] = x;
vtmp[3*n_vtmp+1] = y;
vtmp[3*n_vtmp+2] = z;
v_used[n_vtmp] = 0;
n_vtmp++;
continue;
}
if ( sscanf(line+s, "vn %f %f %f\n", &x, &y, &z) == 3 ) {
vntmp[3*n_vntmp+0] = x;
vntmp[3*n_vntmp+1] = y;
vntmp[3*n_vntmp+2] = z;
vn_used[n_vntmp] = 0;
n_vntmp++;
continue;
}
if ( sscanf(line+s, "vt %f %f %f\n", &x, &y, &z) == 3 ) {
textmp[2*n_textmp+0] = x;
textmp[2*n_textmp+1] = y;
tex_used[n_textmp] = 0;
n_textmp++;
continue;
}
}
/* Go through again and look for faces */
rewind(fh);
out = fopen(argv[2], "w");
fprintf(out, "# %s\n", argv[1]);
fprintf(out, "\n");
nprev = 0;
while ( !feof(fh) ) {
char line[1024];
char **bits;
int n, i;
fgets(line, 1023, fh);
n = assplode(line, " \t\r\n", &bits, ASSPLODE_NONE);
/* Read in a face */
if ( strcmp(bits[0], "f") == 0 ) {
int nthis;
/* Change primitive type if this face has a different number of vertices */
nthis = n-1;
if ( nthis != nprev ) {
if ( nprev != 0 ) fprintf(out, "\n");
if ( nthis == 4 ) {
fprintf(out, "QUADS\n");
} else if ( nthis == 3 ) {
fprintf(out, "TRIANGLES\n");
} else {
fprintf(out, "POLYGONS\n");
}
nprev = nthis;
} else {
//fprintf(out, "#\n");
}
/* For each vertex... */
for ( i=1; i<n; i++ ) {
char **sp;
int np, j, nslash;
nslash = 0;
for ( j=0; j<strlen(bits[i]); j++ ) {
if ( bits[i][j] == '/' ) nslash++;
}
if ( nslash == 2 ) {
int vnum, tnum, nnum;
np = assplode(bits[i], "/", &sp, ASSPLODE_DUPS);
if ( np != 3 ) {
printf("Error!\n");
continue;
}
vnum = atoi(sp[0])-1;
tnum = atoi(sp[1])-1;
nnum = atoi(sp[2])-1;
if ( vnum >= n_vtmp ) {
fprintf(stderr, "Vertex index is too high (%i/%i)\n", vnum, n_vtmp);
continue;
}
if ( nnum >= n_vntmp ) {
fprintf(stderr, "Normal index is too high (%i/%i)\n", nnum, n_vntmp);
continue;
}
fprintf(out, "%+8.3f %+8.3f %+8.3f %8.3f %8.3f %+8.3f %+8.3f %+8.3f\n",
vtmp[3*vnum+0], vtmp[3*vnum+1], vtmp[3*vnum+2],
textmp[2*tnum+0], textmp[2*tnum+1],
vntmp[3*nnum+0], vntmp[3*nnum+1], vntmp[3*nnum+2]);
v_used[vnum] = 1;
vn_used[nnum] = 1;
tex_used[tnum] = 1;
free(sp[0]);
free(sp[1]);
free(sp[2]);
free(sp);
} else if ( nslash == 0 ) {
int vnum;
vnum = atoi(bits[i])-1;
fprintf(out, "%+8.3f %+8.3f %+8.3f %8.3f %8.3f\n",
vtmp[3*vnum+0], vtmp[3*vnum+1], vtmp[3*vnum+2],
0.0, 0.0);
v_used[vnum] = 1;
}
}
}
for ( i=0; i<n; i++ ) free(bits[i]);
free(bits);
}
fprintf(out, "\n");
fclose(fh);
fclose(out);
v_unused = 0;
vn_unused = 0;
tex_unused = 0;
for ( i=0; i<MAX_VERTICES; i++ ) {
if ( v_used[i] == 0 ) {
v_unused++;
}
if ( vn_used[i] == 0 ) {
vn_unused++;
}
if ( tex_used[i] == 0 ) {
tex_unused++;
}
}
printf("%i vertices (%i unused)\n", n_vtmp, v_unused);
printf("%i normals (%i unused)\n", n_vntmp, vn_unused);
printf("%i texcoords (%i unused)\n", n_textmp, tex_unused);
return 0;
}
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