1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/sincos.h	Sat Jun 14 01:56:58 2014 +0300
     1.3 @@ -0,0 +1,27 @@
     1.4 +#ifndef SINCOS_H_
     1.5 +#define SINCOS_H_
     1.6 +
     1.7 +#include <stdint.h>
     1.8 +
     1.9 +#define M_PI_X16	(int32_t)(M_PI * 65536.0)
    1.10 +/*#define M_PI_X16	(int32_t)((31416 << 16) / 10000)*/
    1.11 +
    1.12 +#define SINLUT_SCALE	512
    1.13 +#define SINLUT_SIZE		512
    1.14 +int16_t sinlut[SINLUT_SIZE];
    1.15 +
    1.16 +void sincos_init(void);
    1.17 +
    1.18 +/* takes angle in [0, SINLUT_SIZE] and returns:
    1.19 + * sin(2 * angle / SINLUT_SIZE / pi) * SINLUT_SCALE
    1.20 + */
    1.21 +int16_t sin_int(int16_t norm_angle);
    1.22 +int16_t cos_int(int16_t norm_angle);
    1.23 +
    1.24 +/* takes angle in fixed point 16.16 radians [0, 2pi << 16]
    1.25 + * and returns 16.16 fixed point in [-1 << 16, 1 << 16]
    1.26 + */
    1.27 +int32_t sin_x16(int32_t radians);
    1.28 +int32_t cos_x16(int32_t radians);
    1.29 +
    1.30 +#endif	/* SINCOS_H_ */