ref: 79b51e588d41bc7df8c27f1f1aee57832a9d45ad
dir: /h/bltriangle.h/
typedef struct {
void *ud;
int argpos;
SPFLOAT *args[2];
SPFLOAT *freq;
SPFLOAT *amp;
} sp_bltriangle;
int sp_bltriangle_create(sp_bltriangle **p);
int sp_bltriangle_destroy(sp_bltriangle **p);
int sp_bltriangle_init(sp_data *sp, sp_bltriangle *p);
int sp_bltriangle_compute(sp_data *sp, sp_bltriangle *p, SPFLOAT *in, SPFLOAT *out);