huxi
36 lines
639 B
C
36 lines
639 B
C
#ifndef __MATH_H__
|
|
#define __MATH_H__
|
|
|
|
#include "typedef.h"
|
|
|
|
typedef struct {
|
|
u16 i;
|
|
u16 f;
|
|
} sqrt_res_t;
|
|
|
|
#define MATH_MIN(a, b) ((a) < (b) ? (a) : (b))
|
|
#define MATH_MAX(a, b) ((a) > (b) ? (a) : (b))
|
|
#define MATH_ABS(x) ((x) > 0 ? (x) : (-(x)))
|
|
|
|
#define TRIGO_SHIFT 15
|
|
|
|
int _trigo_sin(int angle);
|
|
void _sqrt(u32 x, sqrt_res_t *q, u32 mask);
|
|
|
|
static inline void sqrt_approx(sqrt_res_t *q, sqrt_res_t *ref, u32 x)
|
|
{
|
|
x = x << 8;
|
|
|
|
u32 raw = (ref->i << 4) + (ref->f >> 4);
|
|
u32 raw2 = raw * raw;
|
|
|
|
int d = x - raw2;
|
|
d = (int)d / (int)(2 * raw) + raw;
|
|
|
|
q->i = d >> 4;
|
|
q->f = (d & 0xF) << 4;
|
|
}
|
|
|
|
#endif
|
|
|