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; sprite facing directions
SPRITE_FACING_DOWN EQU $00
SPRITE_FACING_UP EQU $04
SPRITE_FACING_LEFT EQU $08
SPRITE_FACING_RIGHT EQU $0C
NPC_MOVEMENT_DOWN EQU $00
NPC_MOVEMENT_UP EQU $40
NPC_MOVEMENT_LEFT EQU $80
NPC_MOVEMENT_RIGHT EQU $C0
; player direction constants
PLAYER_DIR_BIT_RIGHT EQU 0
PLAYER_DIR_BIT_LEFT EQU 1
PLAYER_DIR_BIT_DOWN EQU 2
PLAYER_DIR_BIT_UP EQU 3
PLAYER_DIR_RIGHT EQU (1 << PLAYER_DIR_BIT_RIGHT)
PLAYER_DIR_LEFT EQU (1 << PLAYER_DIR_BIT_LEFT)
PLAYER_DIR_DOWN EQU (1 << PLAYER_DIR_BIT_DOWN)
PLAYER_DIR_UP EQU (1 << PLAYER_DIR_BIT_UP)
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