jtmm2-old/include/tiles.h

#ifndef _DEF_TILES
#define _DEF_TILES
#define TILESET_WIDTH 16
#define TILE_AT(x, y) (x + y * TILESET_WIDTH)

typedef unsigned char Tile; /* the tile ID */
typedef unsigned char Tile_flags; /* the tile properties (bitmask) */

/* define flags */
#define F_SOLID 0b1
#define F_SPIKY 0b10
#define F_ICE 0b100
#define F_GLUE 0b1000

/* define properties */
#define P_AIR		(0)
#define P_BASE		(F_SOLID)
#define P_SPIKE		(F_SPIKY)
#define P_UNKNOWN	(0)

enum {
	ID_AIR		= TILE_AT(0, 0),
	ID_CHAIN	= TILE_AT(0, 1),
	ID_BASE_0	= TILE_AT(1, 0),
	ID_BASE_1	= TILE_AT(2, 0),
	ID_BASE_2	= TILE_AT(3, 0),
	ID_BASE_3	= TILE_AT(4, 0),
	ID_BASE_4	= TILE_AT(1, 1),
	ID_BASE_5	= TILE_AT(2, 1),
	ID_BASE_6	= TILE_AT(3, 1),
	ID_BASE_7	= TILE_AT(4, 1),
	ID_BASE_8	= TILE_AT(1, 2),
	ID_BASE_9	= TILE_AT(2, 2),
	ID_BASE_10	= TILE_AT(3, 2),
	ID_BASE_11	= TILE_AT(4, 2),
	ID_BASE_12	= TILE_AT(1, 3),
	ID_BASE_13	= TILE_AT(2, 3),
	ID_BASE_14	= TILE_AT(3, 3),
	ID_BASE_15	= TILE_AT(4, 3),
};

Tile_flags tile_get_flags(Tile tile);
#endif /* _DEF_TILES */