1 files changed, 36 insertions, 0 deletions
diff --git a/maths.c b/maths.c
new file mode 100644
index 0000000..3bed3e1
--- /dev/null
+++ b/maths.c
@@ -0,0 +1,36 @@
+#include "maths.h"
+
+int sin_table[sin_table_count] = {
+	0x000, 0x00c, 0x019, 0x025, 0x032, 0x03e, 0x04b, 0x057,
+	0x063, 0x070, 0x07c, 0x088, 0x094, 0x0a0, 0x0ac, 0x0b8,
+	0x0c3, 0x0cf, 0x0da, 0x0e6, 0x0f1, 0x0fc, 0x107, 0x111,
+	0x11c, 0x126, 0x130, 0x13a, 0x144, 0x14e, 0x157, 0x161,
+	0x16a, 0x172, 0x17b, 0x183, 0x18b, 0x193, 0x19b, 0x1a2,
+	0x1a9, 0x1b0, 0x1b7, 0x1bd, 0x1c3, 0x1c9, 0x1ce, 0x1d4,
+	0x1d9, 0x1dd, 0x1e2, 0x1e6, 0x1e9, 0x1ed, 0x1f0, 0x1f3,
+	0x1f6, 0x1f8, 0x1fa, 0x1fc, 0x1fd, 0x1fe, 0x1ff, 0x1ff,
+	0x200, 0x1ff, 0x1ff, 0x1fe, 0x1fd, 0x1fc, 0x1fa, 0x1f8,
+	0x1f6, 0x1f3, 0x1f0, 0x1ed, 0x1e9, 0x1e6, 0x1e2, 0x1dd,
+	0x1d9, 0x1d4, 0x1ce, 0x1c9, 0x1c3, 0x1bd, 0x1b7, 0x1b0,
+	0x1a9, 0x1a2, 0x19b, 0x193, 0x18b, 0x183, 0x17b, 0x172,
+	0x16a, 0x161, 0x157, 0x14e, 0x144, 0x13a, 0x130, 0x126,
+	0x11c, 0x111, 0x107, 0x0fc, 0x0f1, 0x0e6, 0x0da, 0x0cf,
+	0x0c3, 0x0b8, 0x0ac, 0x0a0, 0x094, 0x088, 0x07c, 0x070,
+	0x063, 0x057, 0x04b, 0x03e, 0x032, 0x025, 0x019, 0x00c,
+};
+int cos_table[sin_table_count];
+
+void init_maths(void) {
+	int i, hs = sin_table_count >> 1;
+	for (
+		i = hs;
+		i <  sin_table_count;
+		i++
+	) {
+		sin_table[i] = -sin_table[i - hs];
+	}
+	hs >>= 1;
+	for (i = 0; i < sin_table_count; i++) {
+		cos_table[i] = sin_table[(i + hs) & sin_table_mask];
+	}
+}