#pragma once

#include <stdint.h>

#define FP1616_FRAC	16

union fp1616{
	int32_t		value;
	uint32_t	uvalue;
	struct {
		int16_t decimal;
		int16_t	predecimal;
	};
};
typedef union fp1616 fp1616_t;
#define fp1616(v) ((fp1616_t){value: v})


static inline	fp1616_t	fp1616_add			( fp1616_t a, fp1616_t b ) { return	fp1616(	a.value + b.value); };
static inline	fp1616_t	fp1616_sub			( fp1616_t a, fp1616_t b ) { return	fp1616(	a.value - b.value); };
static inline	fp1616_t	fp1616_mul			( fp1616_t a, fp1616_t b ) { return fp1616( ((int64_t)a.value * (int64_t)b.value) >> FP1616_FRAC ); };
static inline	fp1616_t	fp1616_div			( fp1616_t a, fp1616_t b ) { return fp1616( ((int64_t)a.value << FP1616_FRAC) / b.value ); };

#define fp1616_eq(a,b)	((a.value == b.value))
#define fp1616_lt(a,b)	((a.value < b.value))
#define fp1616_gt(a,b)	((a.value > b.value))


#define fp4816_from_1616(fp1616)		((fp4816_t)fp1616.value)
#define fp1616_from_4816(fp4816)		((fp1616_t){value: (int32_t)fp4816 })

#define fp1616_from_float_c( value )	(fp1616(value * 65536.0f))
#define fp1616_from_float(f)			(fp1616(fp4816_from_float(f)))
#define fp1616_from_int( value )		( fp1616( (long)value << 16 ) )
#define fp1616_to_float( fp )			( fp4816_to_float( fp4816_from_1616(fp) ) )

struct _fp1616_smoother {
	fp1616_t	value,
				sum,
				k;
};

				fp1616_t	fp1616_smoother(struct _fp1616_smoother *smoother,fp1616_t sample);
static inline	void		fp1616_smoother_set(struct _fp1616_smoother *smoother,fp1616_t tn) { 
	if (smoother) {
		smoother->value.value = 0;
		smoother->sum.value = 0;
		smoother->k = fp1616_div(fp1616(65536),tn);
		}; 
};