ref: 49ff67154a0150cade077dcd040d68bc6a200b17
dir: /h/tread.h/
typedef struct { SPFLOAT index, offset, wrap; int mode; SPFLOAT mul; sp_ftbl *ft; } sp_tread; int sp_tread_create(sp_tread **p); int sp_tread_destroy(sp_tread **p); int sp_tread_init(sp_data *sp, sp_tread *p, sp_ftbl *ft, int mode); int sp_tread_compute(sp_data *sp, sp_tread *p, SPFLOAT *in, SPFLOAT *out);