gamedefs.h

Linux游戏编程源码

#ifndef GAMEDEFS_H
#define GAMEDEFS_H

/* Dimensions of the game window. */
#define SCREEN_WIDTH	640
#define SCREEN_HEIGHT	480

/* Number of particles allowed in the particle system. */
#define MAX_PARTICLES	10000

/* Dimensions of the player's ship. The graphics data must correspond to this. */
#define PLAYER_WIDTH	96
#define PLAYER_HEIGHT	96

/* Dimensions of the map tiles. */
#define TILE_WIDTH	64
#define TILE_HEIGHT	64

/* Total size (in pixels) of the complete playfield. */
#define WORLD_WIDTH	2000
#define WORLD_HEIGHT	2000

/* Limits on the player. */
#define PLAYER_MAX_VELOCITY	(15.0)
#define PLAYER_MIN_VELOCITY	(-10.0)

#define PLAYER_FORWARD_THRUST	(3)
#define PLAYER_REVERSE_THRUST	(-2)

/* These define the scrolling speeds of the front and back background
   layers, relative to the movement of the camera. */
#define PARALLAX_BACK_FACTOR		4
#define PARALLAX_FRONT_FACTOR		2

/* These define the sizes of the backgrond tile grids. We don't really
   need a one to one mapping between the size of the playing field and
   the size of the tile grids; we can wrap around at some point, and
   nobody will notice a difference. */
#define PARALLAX_GRID_WIDTH		100
#define PARALLAX_GRID_HEIGHT		100

#define PI (3.141592654F)

/* Our time scaling factor. This is defined in main.c, but
   it needs to be accessible to the other game modules. */
extern double time_scale;

/* Data structure for player ships */
typedef struct player_s {
	double angle;		/* in clockwise degrees, 0 -> due east */
	double world_x,world_y;	/* coordinates in the world */
	int screen_x,screen_y;	/* onscreen coordinates */
	double velocity;	/* velocity in pixels per frame */
	double accel;		/* acceleration in pixels/frame^2 */
	int shields;		/* shield strength left */
} player_t, *player_p;

#endif