libbubulle/tools/importobj.c

/*
	          LIBBUBULLES

	some functions for importing bubulles from dot-OBJ files.
*/

#include  <stdio.h>
#include  <stdlib.h>
#include  <string.h>

#include  "../bubulles.h"
#include  "../edges.h"

extern int		verbosity;

/* --------------------------------------------------------------------- */

#define LINE_SZ			666

static	BBList			*bublist;
static	EdgeList		*edges;

/* --------------------------------------------------------------------- */

typedef struct	{
	char		*token;
	int		id;
	} Tokens;

enum token_id { T_comment=1, T_vertice, T_group, T_face, T_vt };

Tokens TokenList[] = {
	{  "#",		T_comment	},
	{  "v",		T_vertice	},
	{  "g",		T_group		},	// to be verified !
	{  "f",		T_face		},
	{  "vt",	T_vt		},	// c'est quoi ce truc ?
	{  NULL,	0		}
	};

static int type_of_the_line(char *text)
{
Tokens		*token;

#if DEBUG_LEVEL > 1
fprintf(stderr, "%s is searching for '%s'\n", __func__, text);
#endif

for (token=TokenList; token->token; token++) {
	// fprintf(stderr, "   %5s   ->  %d\n", token->token, token->id);
	if (!strcmp(token->token, text)) {
		return token->id;
		}
	}

return -1;
}
/* --------------------------------------------------------------------- */
int parse_vertice(char *cptr, float *px, float *py, float *pz)
{
float		x, y, z;
int		foo;

foo = 0;
cptr = strtok(NULL, " ");
foo += sscanf(cptr, "%f", &x);
cptr = strtok(NULL, " ");
foo += sscanf(cptr, "%f", &y);
cptr = strtok(NULL, " ");
foo += sscanf(cptr, "%f", &z);

if (3 == foo) {
	*px = x;	*py = y;	*pz = z;
	}

return foo;
}
/* --------------------------------------------------------------------- */
/* new Mon 27 Mar 2023 12:08:18 AM CEST */
int parse_face(char *cptr, int phy)
{
int		ix, foo;
int		fa, fb;

#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( '%s' %d )\n", __func__, cptr, phy);
#endif

for (ix=0; ix<3; ix++) {
	cptr = strtok(NULL, " ");
	if (NULL == cptr) {
		fprintf(stderr, "incomplete face in %s\n", __func__);
		return -4;
		}
	if (2 != sscanf(cptr, "%d/%d", &fa, &fb)) {
		fprintf(stderr, "%s: err sscanf\n", __func__);
		exit(1);
		return -3;
		}
	// XXX fprintf(stderr, "  %d  got %d %d\n", ix, fa, fb);

	/*
	 * yes, i've found 0-lenght edges, wtf ?
	 */
	if (fa == fb)	{
		// fprintf(stderr, "'%s' dublicate\n", cptr);
		continue;
		}

	foo = push_a_missing_edge(edges, fa, fb);
	if (foo) {
		fprintf(stderr, "%s: disaster #%d\n", __func__, foo);
#if MUST_ABORT		
		fflush(stderr), abort();
#endif
		return -2;
		}
	}

#if DEBUG_LEVEL
fprintf(stderr, "<<< %s\n", __func__);
#endif

return 0;
}
/* --------------------------------------------------------------------- */
int try_to_read_an_OBJ_file(char *infname, char *file_vert, char *file_edges,
				int notused)
{
FILE		*fpin;
char		line[LINE_SZ+1], *cptr;
float		x, y, z;
int		foo, nbre, tokenid;
Bubulle         bubulle;


#if DEBUG_LEVEL
fprintf(stderr, ">>> %s ( '%s' %d )\n\n", __func__, infname, notused);
#endif

if (NULL==(fpin=fopen(infname, "r"))) {
	perror(infname);
	exit(1);
	}

bublist = alloc_bubulles(infname, 500000, 0);
if (NULL==bublist) {
        fprintf(stderr, "in %s, no mem for bubls, aborting...\n", __func__);
        abort();
        }
print_bublist_desc(bublist, 0);

edges = alloc_edgelist("krkrkr", 200000, 0);
if (NULL==edges) {
        fprintf(stderr, "no mem for edges in %s, aborting...\n", __func__);
        abort();
        }
print_edgelist_desc(edges, 0);

fprintf(stderr, "\n***********************************\n");

nbre = 0;
while(NULL!=(cptr=fgets(line, LINE_SZ, fpin))) {

	if ('\n' != line[strlen(line)-1]) {
		fprintf(stderr, "%s: short read on %s...\n",
					__func__, infname);
		// return -2;
		break;
		}
	line[strlen(line)-1] = '\0';		/* kill the newline */
	if (verbosity>1) fprintf(stderr, "line read ==|%s|==\n", line);

	cptr = strtok(line, " ");
	if (NULL == cptr) {
		fprintf(stderr, "no token ?\n");
		continue;
		}
	tokenid = type_of_the_line(cptr);
	if (verbosity > 1)
		fprintf(stderr, "token '%s' --> %d\n", cptr, tokenid);

	memset(&bubulle, 0, sizeof(Bubulle));

	switch (tokenid) {
		case T_comment:
			/* do nothing */
			break;

		case T_vertice:
			x = y = z = 0.0;
			foo = parse_vertice(cptr, &x, &y, &z);
			if (3!=foo) {
				abort();
				}
			bubulle.p.x = x;
			bubulle.p.y = y;
			bubulle.p.z = z;
			if (verbosity > 1) niceprint_bubulle(&bubulle, 0);
			foo = push_bubulle(bublist, &bubulle);
			if (foo) {
				abort();
				}
			break;

		case T_group:
			cptr = strtok(NULL, " ");
			fprintf(stderr, "\tGroup:  %s\n", cptr);
			break;

		case T_face:
			foo = parse_face(cptr, 0);
			if (foo)  fprintf(stderr, "  '%s' parse face -> %d\n",
							cptr, foo);
			break;
			 
		default:
			// fprintf(stderr, "\ttoken %d ?\n", tokenid);
			continue;		/* wtf ? */
		}

	nbre++;
	}
fclose(fpin);

fprintf(stderr, "\n***********************************\n");

if(verbosity) {
	fprintf(stderr, "in %s, %d vertices loaded\n", __func__, bublist->fidx);
	}

print_bublist_desc(bublist, 0);
bubulles_to_data(file_vert, NULL, bublist, 0);
free_bubulles(bublist, 0);

print_edgelist_desc(edges, 0);
print_the_edges(stdout, edges, 0);
free_edgelist(edges, 0);

return 0;
}

/* --------------------------------------------------------------------- */