Add the Fast trig functions that work with EQ headings

This should match pretty close to the clients LUTs

Also fixed a bug with push

zone/fastmath.cpp

@@ -0,0 +1,32 @@
+#include <cmath>
+#include "fastmath.h"
+
+FastMath g_Math;
+
+// This should match EQ's sin/cos LUTs
+// Some values didn't match on linux, but they were the "same" float :P
+FastMath::FastMath()
+{
+	int ci = 0;
+	int si = 128;
+	float res;
+	do {
+		res = std::cos(static_cast<float>(ci) * M_PI * 2 / 512);
+		lut_cos[ci] = res;
+		if (si == 512)
+			si = 0;
+		lut_sin[si] = res;
+		++ci;
+		++si;
+	} while (ci < 512);
+
+	lut_sin[0] = 0.0f;
+	lut_sin[128] = 1.0f;
+	lut_sin[256] = 0.0f;
+	lut_sin[384] = -1.0f;
+
+	lut_cos[0] = 1.0f;
+	lut_cos[128] = 0.0f;
+	lut_cos[384] = 0.0f;
+}
+