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/* -*- c -*-
* Time-stamp: <2009-03-28 09:52:04 rsmith>
*
* stl2pov/parse.h
* Copyright © 2004--2009 R.F. Smith <rsmith@xs4all.nl>.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/

#ifndef PARSE_H
#define PARSE_H

#ifdef __cplusplus
# define BEGIN_C_DECLS extern "C" {
# define END_C_DECLS }
#else /* !__cplusplus */
# define BEGIN_C_DECLS
# define END_C_DECLS
#endif /* __cplusplus */
#include <stdio.h>

BEGIN_C_DECLS

struct vertex {
float xyz[3];
int refcnt; /* number of facets */
};

float xyz_max[3];
float xyz_min[3];
float largest_axis;

struct edge {
int vertex[2];
int facet[2]; /* facets that reference this vertex */
int refcnt; /* number of facets */
};

struct facet {
int vertex[3];
int edges[3];
float normal[3];
};

struct stl_reader {
char name[85];
struct vertex *v; /* vertex */
struct edge *e; /* edge */
struct facet *f; /* facet */
int nv, ne, nf, maxnf;
/* The following are for the reader state. */
float pdone; /* percentage */
char *buf, *ptr;
long buflen;
int fmt; /* FMT_BINARY or FMT_TEXT */
};

/* Square of the allowable distance between two points that are reckoned
* to be the same. */
extern float epsilon2;

/* Create the reader structure. */
extern struct stl_reader *stl_reader_init(char *fname);

/* Execute a parsing step. */
extern int stl_reader_step(struct stl_reader *r);

/* Free the memory used by the reader. */
extern void stl_reader_delete(struct stl_reader *r);

/* Calculate the vertex normal for a vertex indexed by 'vi' belonging to
* facet indexed by 'ti'. */
extern int calc_vertex_normal(struct stl_reader *r,
int fi, int vi, float normal[3]);

/* Calculate the maximum dimension of a facet indexed by 'fi' */
extern float maxdim(struct stl_reader *r, int fi);

END_C_DECLS
#endif /* PARSE_H */
/* EOF parse.h */
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