#ifndef EZ3D_STL_WRITE_H
#define EZ3D_STL_WRITE_H

#include <stdint.h>
#include <stdio.h>

#include "triangle.h"

typedef struct {
    FILE *f;
    int ascii;
    uint32_t ntri;      /* facets written so far */
    const char *path;
    long count_offset;  /* file offset of the binary facet-count field */
} stl_writer_t;

/* Open the output; writes the 80-byte binary header (or "solid" prologue)
 * with a placeholder facet count that stl_close() back-patches. */
int stl_open(stl_writer_t *w, const char *path, int ascii);

/* Emit one triangle; the facet normal is computed here. */
void stl_tri(stl_writer_t *w, const vertex_t *a, const vertex_t *b, const vertex_t *c);

/* Back-patch the facet count and close. Returns facets written, or -1. */
long stl_close(stl_writer_t *w);

#endif /* EZ3D_STL_WRITE_H */