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#ifndef FILTER_H_
#define FILTER_H_
struct Filter {
// public
float cutoff, resonance;
// private
float resonance_input, stage_1, stage_2, stage_3, stage_4;
float cutoff_calc, resonance_calc;
int last_calc;
float b0, b1, b2, b3, b4; //filter buffers (beware denormals!)
void filter_init(struct Filter *filter, float cutoff, float q);
void filter_set_cutoff(struct Filter *filter, float cutoff);
void filter_set_resonance(struct Filter *filter, float resonance);
float filter_sample(struct Filter *filter, float input);
#endif /* FILTER_H_ */