#define KEYPRESS(key) ((keystate & (key)) && (keydelta & (key)))
#define KEYRELEASE(key) ((keystate & (key)) == 0 && (keydelta & (key)))
#define KEYPRESS(key) ((keystate & (key)) && (keydelta & (key)))
#define KEYRELEASE(key) ((keystate & (key)) == 0 && (keydelta & (key)))