X-Git-Url: http://git.mutantstargoat.com/user/nuclear/?p=regis;a=blobdiff_plain;f=sincos.h;fp=sincos.h;h=82d7c5e1f58fa78b4627e4c620c2a61524603515;hp=0000000000000000000000000000000000000000;hb=4ac276ea513d4460f9db8c43b4dbde5ebad652b5;hpb=46aa499cb189f9eb533e1e5a95a3770a0b3df8b4

diff --git a/sincos.h b/sincos.h
new file mode 100644
index 0000000..82d7c5e
--- /dev/null
+++ b/sincos.h
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+#ifndef SINCOS_H_
+#define SINCOS_H_
+
+#include <stdint.h>
+
+/*#define M_PI_X16	(int32_t)(M_PI * 65536.0) */
+#define M_PI_X16	(int32_t)((31416 << 16) / 10000)
+
+#define SINLUT_SCALE	512
+#define SINLUT_SIZE		512
+int16_t sinlut[SINLUT_SIZE];
+
+void sincos_init(void);
+
+/* takes angle in [0, SINLUT_SIZE] and returns:
+ * sin(2 * angle / SINLUT_SIZE / pi) * SINLUT_SCALE
+ */
+int16_t sin_int(int16_t norm_angle);
+int16_t cos_int(int16_t norm_angle);
+
+/* takes angle in fixed point 16.16 radians [0, 2pi << 16]
+ * and returns 16.16 fixed point in [-1 << 16, 1 << 16]
+ */
+int32_t sin_x16(int32_t radians);
+int32_t cos_x16(int32_t radians);
+
+#endif	/* SINCOS_H_ */