using UnityEngine;

namespace Gaia
{
	public class SimplexNoiseGenerator
	{
		public static byte[] perm = new byte[512]
		{
			151, 160, 137, 91, 90, 15, 131, 13, 201, 95,
			96, 53, 194, 233, 7, 225, 140, 36, 103, 30,
			69, 142, 8, 99, 37, 240, 21, 10, 23, 190,
			6, 148, 247, 120, 234, 75, 0, 26, 197, 62,
			94, 252, 219, 203, 117, 35, 11, 32, 57, 177,
			33, 88, 237, 149, 56, 87, 174, 20, 125, 136,
			171, 168, 68, 175, 74, 165, 71, 134, 139, 48,
			27, 166, 77, 146, 158, 231, 83, 111, 229, 122,
			60, 211, 133, 230, 220, 105, 92, 41, 55, 46,
			245, 40, 244, 102, 143, 54, 65, 25, 63, 161,
			1, 216, 80, 73, 209, 76, 132, 187, 208, 89,
			18, 169, 200, 196, 135, 130, 116, 188, 159, 86,
			164, 100, 109, 198, 173, 186, 3, 64, 52, 217,
			226, 250, 124, 123, 5, 202, 38, 147, 118, 126,
			255, 82, 85, 212, 207, 206, 59, 227, 47, 16,
			58, 17, 182, 189, 28, 42, 223, 183, 170, 213,
			119, 248, 152, 2, 44, 154, 163, 70, 221, 153,
			101, 155, 167, 43, 172, 9, 129, 22, 39, 253,
			19, 98, 108, 110, 79, 113, 224, 232, 178, 185,
			112, 104, 218, 246, 97, 228, 251, 34, 242, 193,
			238, 210, 144, 12, 191, 179, 162, 241, 81, 51,
			145, 235, 249, 14, 239, 107, 49, 192, 214, 31,
			181, 199, 106, 157, 184, 84, 204, 176, 115, 121,
			50, 45, 127, 4, 150, 254, 138, 236, 205, 93,
			222, 114, 67, 29, 24, 72, 243, 141, 128, 195,
			78, 66, 215, 61, 156, 180, 151, 160, 137, 91,
			90, 15, 131, 13, 201, 95, 96, 53, 194, 233,
			7, 225, 140, 36, 103, 30, 69, 142, 8, 99,
			37, 240, 21, 10, 23, 190, 6, 148, 247, 120,
			234, 75, 0, 26, 197, 62, 94, 252, 219, 203,
			117, 35, 11, 32, 57, 177, 33, 88, 237, 149,
			56, 87, 174, 20, 125, 136, 171, 168, 68, 175,
			74, 165, 71, 134, 139, 48, 27, 166, 77, 146,
			158, 231, 83, 111, 229, 122, 60, 211, 133, 230,
			220, 105, 92, 41, 55, 46, 245, 40, 244, 102,
			143, 54, 65, 25, 63, 161, 1, 216, 80, 73,
			209, 76, 132, 187, 208, 89, 18, 169, 200, 196,
			135, 130, 116, 188, 159, 86, 164, 100, 109, 198,
			173, 186, 3, 64, 52, 217, 226, 250, 124, 123,
			5, 202, 38, 147, 118, 126, 255, 82, 85, 212,
			207, 206, 59, 227, 47, 16, 58, 17, 182, 189,
			28, 42, 223, 183, 170, 213, 119, 248, 152, 2,
			44, 154, 163, 70, 221, 153, 101, 155, 167, 43,
			172, 9, 129, 22, 39, 253, 19, 98, 108, 110,
			79, 113, 224, 232, 178, 185, 112, 104, 218, 246,
			97, 228, 251, 34, 242, 193, 238, 210, 144, 12,
			191, 179, 162, 241, 81, 51, 145, 235, 249, 14,
			239, 107, 49, 192, 214, 31, 181, 199, 106, 157,
			184, 84, 204, 176, 115, 121, 50, 45, 127, 4,
			150, 254, 138, 236, 205, 93, 222, 114, 67, 29,
			24, 72, 243, 141, 128, 195, 78, 66, 215, 61,
			156, 180
		};

		public static float Generate(float x)
		{
			int num = FastFloor(x);
			int num2 = num + 1;
			float num3 = x - (float)num;
			float num4 = num3 - 1f;
			float num5 = 1f - num3 * num3;
			float num6 = num5 * num5;
			float num7 = num6 * num6 * Grad(perm[num & 0xFF], num3);
			float num8 = 1f - num4 * num4;
			float num9 = num8 * num8;
			float num10 = num9 * num9 * Grad(perm[num2 & 0xFF], num4);
			return 0.395f * (num7 + num10);
		}

		public static float Generate(float x, float y)
		{
			float num = (x + y) * 0.3660254f;
			float x2 = x + num;
			float x3 = y + num;
			int num2 = FastFloor(x2);
			int num3 = FastFloor(x3);
			float num4 = (float)(num2 + num3) * 0.21132487f;
			float num5 = (float)num2 - num4;
			float num6 = (float)num3 - num4;
			float num7 = x - num5;
			float num8 = y - num6;
			int num9;
			int num10;
			if (num7 > num8)
			{
				num9 = 1;
				num10 = 0;
			}
			else
			{
				num9 = 0;
				num10 = 1;
			}
			float num11 = num7 - (float)num9 + 0.21132487f;
			float num12 = num8 - (float)num10 + 0.21132487f;
			float num13 = num7 - 1f + 0.42264974f;
			float num14 = num8 - 1f + 0.42264974f;
			int num15 = num2 % 256;
			int num16 = num3 % 256;
			float num17 = 0.5f - num7 * num7 - num8 * num8;
			float num18;
			if (num17 < 0f)
			{
				num18 = 0f;
			}
			else
			{
				num17 *= num17;
				num18 = num17 * num17 * Grad(perm[num15 + perm[num16]], num7, num8);
			}
			float num19 = 0.5f - num11 * num11 - num12 * num12;
			float num20;
			if (num19 < 0f)
			{
				num20 = 0f;
			}
			else
			{
				num19 *= num19;
				num20 = num19 * num19 * Grad(perm[num15 + num9 + perm[num16 + num10]], num11, num12);
			}
			float num21 = 0.5f - num13 * num13 - num14 * num14;
			float num22;
			if (num21 < 0f)
			{
				num22 = 0f;
			}
			else
			{
				num21 *= num21;
				num22 = num21 * num21 * Grad(perm[num15 + 1 + perm[num16 + 1]], num13, num14);
			}
			return 40f * (num18 + num20 + num22);
		}

		public static float Generate(float x, float y, float z)
		{
			float num = (x + y + z) * (1f / 3f);
			float x2 = x + num;
			float x3 = y + num;
			float x4 = z + num;
			int num2 = FastFloor(x2);
			int num3 = FastFloor(x3);
			int num4 = FastFloor(x4);
			float num5 = (float)(num2 + num3 + num4) * (1f / 6f);
			float num6 = (float)num2 - num5;
			float num7 = (float)num3 - num5;
			float num8 = (float)num4 - num5;
			float num9 = x - num6;
			float num10 = y - num7;
			float num11 = z - num8;
			int num12;
			int num13;
			int num14;
			int num15;
			int num16;
			int num17;
			if (num9 >= num10)
			{
				if (num10 >= num11)
				{
					num12 = 1;
					num13 = 0;
					num14 = 0;
					num15 = 1;
					num16 = 1;
					num17 = 0;
				}
				else if (num9 >= num11)
				{
					num12 = 1;
					num13 = 0;
					num14 = 0;
					num15 = 1;
					num16 = 0;
					num17 = 1;
				}
				else
				{
					num12 = 0;
					num13 = 0;
					num14 = 1;
					num15 = 1;
					num16 = 0;
					num17 = 1;
				}
			}
			else if (num10 < num11)
			{
				num12 = 0;
				num13 = 0;
				num14 = 1;
				num15 = 0;
				num16 = 1;
				num17 = 1;
			}
			else if (num9 < num11)
			{
				num12 = 0;
				num13 = 1;
				num14 = 0;
				num15 = 0;
				num16 = 1;
				num17 = 1;
			}
			else
			{
				num12 = 0;
				num13 = 1;
				num14 = 0;
				num15 = 1;
				num16 = 1;
				num17 = 0;
			}
			float num18 = num9 - (float)num12 + 1f / 6f;
			float num19 = num10 - (float)num13 + 1f / 6f;
			float num20 = num11 - (float)num14 + 1f / 6f;
			float num21 = num9 - (float)num15 + 1f / 3f;
			float num22 = num10 - (float)num16 + 1f / 3f;
			float num23 = num11 - (float)num17 + 1f / 3f;
			float num24 = num9 - 1f + 0.5f;
			float num25 = num10 - 1f + 0.5f;
			float num26 = num11 - 1f + 0.5f;
			int num27 = Mod(num2, 256);
			int num28 = Mod(num3, 256);
			int num29 = Mod(num4, 256);
			float num30 = 0.6f - num9 * num9 - num10 * num10 - num11 * num11;
			float num31;
			if (num30 < 0f)
			{
				num31 = 0f;
			}
			else
			{
				num30 *= num30;
				num31 = num30 * num30 * Grad(perm[num27 + perm[num28 + perm[num29]]], num9, num10, num11);
			}
			float num32 = 0.6f - num18 * num18 - num19 * num19 - num20 * num20;
			float num33;
			if (num32 < 0f)
			{
				num33 = 0f;
			}
			else
			{
				num32 *= num32;
				num33 = num32 * num32 * Grad(perm[num27 + num12 + perm[num28 + num13 + perm[num29 + num14]]], num18, num19, num20);
			}
			float num34 = 0.6f - num21 * num21 - num22 * num22 - num23 * num23;
			float num35;
			if (num34 < 0f)
			{
				num35 = 0f;
			}
			else
			{
				num34 *= num34;
				num35 = num34 * num34 * Grad(perm[num27 + num15 + perm[num28 + num16 + perm[num29 + num17]]], num21, num22, num23);
			}
			float num36 = 0.6f - num24 * num24 - num25 * num25 - num26 * num26;
			float num37;
			if (num36 < 0f)
			{
				num37 = 0f;
			}
			else
			{
				num36 *= num36;
				num37 = num36 * num36 * Grad(perm[num27 + 1 + perm[num28 + 1 + perm[num29 + 1]]], num24, num25, num26);
			}
			return 32f * (num31 + num33 + num35 + num37);
		}

		private static int FastFloor(float x)
		{
			if (!(x > 0f))
			{
				return (int)x - 1;
			}
			return (int)x;
		}

		private static int Mod(int x, int m)
		{
			int num = x % m;
			if (num >= 0)
			{
				return num;
			}
			return num + m;
		}

		private static float Grad(int hash, float x)
		{
			int num = hash & 0xF;
			float num2 = 1f + (float)(num & 7);
			if ((num & 8) != 0)
			{
				num2 = 0f - num2;
			}
			return num2 * x;
		}

		private static float Grad(int hash, float x, float y)
		{
			int num = hash & 7;
			float num2 = ((num < 4) ? x : y);
			float num3 = ((num < 4) ? y : x);
			return (((num & 1) != 0) ? (0f - num2) : num2) + (((num & 2) != 0) ? (-2f * num3) : (2f * num3));
		}

		private static float Grad(int hash, float x, float y, float z)
		{
			int num = hash & 0xF;
			float num2 = ((num < 8) ? x : y);
			float num3 = ((num < 4) ? y : ((num == 12 || num == 14) ? x : z));
			return (((num & 1) != 0) ? (0f - num2) : num2) + (((num & 2) != 0) ? (0f - num3) : num3);
		}

		private static float Grad(int hash, float x, float y, float z, float t)
		{
			int num = hash & 0x1F;
			float num2 = ((num < 24) ? x : y);
			float num3 = ((num < 16) ? y : z);
			float num4 = ((num < 8) ? z : t);
			return (((num & 1) != 0) ? (0f - num2) : num2) + (((num & 2) != 0) ? (0f - num3) : num3) + (((num & 4) != 0) ? (0f - num4) : num4);
		}

		public static float GetNormalisedValue(float x, float y)
		{
			return Mathf.Clamp((Generate(x, y) + 1f) / 2f, 0f, 1f);
		}
	}
}