public class Meow {
    static public final float PI = 3.1415927f;
    static public final float PI2 = PI * 2;

    static private final int SIN_BITS = 14; // 16KB. Adjust for accuracy.
    static private final int SIN_MASK = ~(-1 << SIN_BITS);
    static private final int SIN_COUNT = SIN_MASK + 1;

    static private final float radFull = PI * 2;
    static private final float degFull = 360;
    static private final float radToIndex = SIN_COUNT / radFull;
    static private final float degToIndex = SIN_COUNT / degFull;

    static public final float degreesToRadians = PI / 180;

    static private class Sin {
        static final float[] table = new float[SIN_COUNT];

        static {
            for (int i = 0; i < SIN_COUNT; i++)
                table[i] = (float)Math.sin((i + 0.5f) / SIN_COUNT * radFull);
            for (int i = 0; i < 360; i += 90) {
                table[(int)(i * degToIndex) & SIN_MASK] = (float)Math.sin(i * degreesToRadians);
            }
        }
    }

    static public void main (String[] args) throws Exception {
        float b = 1;
        while (b != 0) {
            System.gc();
            Thread.sleep(100);
            System.gc();
            Thread.sleep(50);

            float a;
            long s, e;
            s = System.nanoTime();
            for (int i = 0; i < 1250; i++)
                for (a = -MathUtils.PI2; a < MathUtils.PI2; a += 0.0001f)
                    b += a;
            e = System.nanoTime();
            long loopTime = e - s;

            System.gc();
            Thread.sleep(100);
            System.gc();
            Thread.sleep(50);

            s = System.nanoTime();
            for (int i = 0; i < 1250; i++)
                for (a = -MathUtils.PI2; a < MathUtils.PI2; a += 0.0001f)
                    b += sin(a);
            e = System.nanoTime();
            System.out.println("MathUtils.sin " + (e - s - loopTime) / 1e6);

            System.gc();
            Thread.sleep(100);
            System.gc();
            Thread.sleep(50);

            s = System.nanoTime();
            for (int i = 0; i < 1250; i++)
                for (a = -MathUtils.PI2; a < MathUtils.PI2; a += 0.0001f)
                    b += sinQuadratic(a);
            e = System.nanoTime();
            System.out.println("sinQuadratic  " + (e - s - loopTime) / 1e6);
        }
    }

    static public float sinQuadratic (float x) {
        if (x < -3.14159265)
            x += 6.28318531;
        else if (x > 3.14159265) x -= 6.28318531;
        if (x < 0) return 1.27323954f * x + 0.405284735f * x * x;
        return 1.27323954f * x - 0.405284735f * x * x;
    }

    static public float sin (float radians) {
        int i = (int)(radians * radToIndex) & SIN_MASK;
        return Sin.table[i];
    }
}