Data structure of LEVEL_FUNC_PACK:
struct _LEVEL_FUNC_PACK {
COMPONENT neg_component; /* index of negative side region */
COMPONENT pos_component; /* index of positive side region */
float (*func)(POINTER,float*); /* initial interface level function */
POINTER func_params; /* parameters of the level function */
};
typedef struct _LEVEL_FUNC_PACK LEVEL_FUNC_PACK;