#define LOOKUP_SAMPLES 360

extern double _sin_table[LOOKUP_SAMPLES + 1];
extern double _saw_table[LOOKUP_SAMPLES + 1];
extern double _tri_table[LOOKUP_SAMPLES + 1];

struct osc_t
{
	double freq;
	double step;
	double ramp;

	double sin;
	double saw;
	double tri;
};

void osc_init();
void osc_setfreq(struct osc_t *osc, double freq);

static inline void osc_tick(struct osc_t *osc)
{
	osc->ramp += osc->step;
	if (osc->ramp > LOOKUP_SAMPLES) osc->ramp -= LOOKUP_SAMPLES;

	uint32_t pos = floor(osc->ramp);

	osc->sin = _sin_table[pos];
	osc->saw = _saw_table[pos];
	osc->tri = _tri_table[pos];
}