//
// starfld.h
//
// Include file for any programs wanting to use starfield functionality.
//
// richard.cutting@virgin.net 
// http://www.netyaroze-europe.com/~rcutting
//
// Please feel free to use this code as you want to for your own non
// commercial use but please leave my name in the headers if you do. If
// you do use it, extend it or change it then please let me know !
//
// Richard Cutting 14 May 1998
//

#include <libps.h>

#ifndef _STARFLD_H

#define _STARFLD_H	1

#define		STAR_NO_SCROLL		0
#define 	STAR_SCROLL_LEFT	1
#define		STAR_SCROLL_RIGHT 	2
#define		STAR_SCROLL_UP		3
#define		STAR_SCROLL_DOWN	4

#define		USE_BOX			1
#define		USE_IMAGE		2
#define		USE_SPRITE		3

#define		EFFECT_SCROLL		1
#define 	EFFECT_SUCK		2

#define		TO_ORIGIN		1
#define		TO_ORIGINAL		2

// Structure used to hold stars.

typedef struct tagStar
{
	int orig_x;
	int orig_y;
	int x;
	int y;
	int z;
	int speed;
	int dx;
	int dy;
	int x_inc;
	int y_inc;
	int error;
	int index;
	GsBOXF box;
	CVECTOR rgb;
	struct  tagStar *next;
} StarType;

void free_starfield( void );
void initialise_starfield( int method, int flag, int num_stars, int num_planes,
int scroll_dir, int change_time, int animate_every_n_frame, int ot_length, 
u_long timaddr );
void animate_starfield( void );
void render_starfield( void );
void scroll_starfield( void );
void init_suck_stars( int suck_to );
int suck_stars( void );
void starfield_game_start_frig( void );
void flying_through_space( void );



#endif