using UnityEngine;

namespace Artngame.SKYMASTER.PlanetCreator
{
	public class ImprovedPerlinNoise
	{
		private const int SIZE = 256;

		private int[] m_perm = new int[512];

		private Texture2D m_permTable1D;

		private Texture2D m_permTable2D;

		private Texture2D m_gradient2D;

		private Texture2D m_gradient3D;

		private Texture2D m_gradient4D;

		private static float[] GRADIENT2 = new float[16]
		{
			0f, 1f, 1f, 1f, 1f, 0f, 1f, -1f, 0f, -1f,
			-1f, -1f, -1f, 0f, -1f, 1f
		};

		private static float[] GRADIENT3 = new float[48]
		{
			1f, 1f, 0f, -1f, 1f, 0f, 1f, -1f, 0f, -1f,
			-1f, 0f, 1f, 0f, 1f, -1f, 0f, 1f, 1f, 0f,
			-1f, -1f, 0f, -1f, 0f, 1f, 1f, 0f, -1f, 1f,
			0f, 1f, -1f, 0f, -1f, -1f, 1f, 1f, 0f, 0f,
			-1f, 1f, -1f, 1f, 0f, 0f, -1f, -1f
		};

		private static float[] GRADIENT4 = new float[128]
		{
			0f, -1f, -1f, -1f, 0f, -1f, -1f, 1f, 0f, -1f,
			1f, -1f, 0f, -1f, 1f, 1f, 0f, 1f, -1f, -1f,
			0f, 1f, -1f, 1f, 0f, 1f, 1f, -1f, 0f, 1f,
			1f, 1f, -1f, -1f, 0f, -1f, -1f, 1f, 0f, -1f,
			1f, -1f, 0f, -1f, 1f, 1f, 0f, -1f, -1f, -1f,
			0f, 1f, -1f, 1f, 0f, 1f, 1f, -1f, 0f, 1f,
			1f, 1f, 0f, 1f, -1f, 0f, -1f, -1f, 1f, 0f,
			-1f, -1f, -1f, 0f, -1f, 1f, 1f, 0f, -1f, 1f,
			-1f, 0f, 1f, -1f, 1f, 0f, 1f, -1f, -1f, 0f,
			1f, 1f, 1f, 0f, 1f, 1f, 0f, -1f, -1f, 0f,
			0f, -1f, -1f, 0f, 0f, -1f, 1f, 0f, 0f, -1f,
			1f, 0f, 0f, 1f, -1f, 0f, 0f, 1f, -1f, 0f,
			0f, 1f, 1f, 0f, 0f, 1f, 1f, 0f
		};

		public Texture2D GetPermutationTable1D()
		{
			return m_permTable1D;
		}

		public Texture2D GetPermutationTable2D()
		{
			return m_permTable2D;
		}

		public Texture2D GetGradient2D()
		{
			return m_gradient2D;
		}

		public Texture2D GetGradient3D()
		{
			return m_gradient3D;
		}

		public Texture2D GetGradient4D()
		{
			return m_gradient4D;
		}

		public ImprovedPerlinNoise(int seed)
		{
			Random.InitState(seed);
			int i;
			for (i = 0; i < 256; i++)
			{
				m_perm[i] = i;
			}
			while (--i != 0)
			{
				int num = m_perm[i];
				int num2 = Random.Range(0, 256);
				m_perm[i] = m_perm[num2];
				m_perm[num2] = num;
			}
			for (i = 0; i < 256; i++)
			{
				m_perm[256 + i] = m_perm[i];
			}
		}

		public void LoadResourcesFor2DNoise()
		{
			LoadPermTable1D();
			LoadGradient2D();
		}

		public void LoadResourcesFor3DNoise()
		{
			LoadPermTable2D();
			LoadGradient3D();
		}

		public void LoadResourcesFor4DNoise()
		{
			LoadPermTable1D();
			LoadPermTable2D();
			LoadGradient4D();
		}

		private void LoadPermTable1D()
		{
			if (!m_permTable1D)
			{
				m_permTable1D = new Texture2D(256, 1, TextureFormat.Alpha8, mipChain: false, linear: true);
				m_permTable1D.filterMode = FilterMode.Point;
				m_permTable1D.wrapMode = TextureWrapMode.Repeat;
				for (int i = 0; i < 256; i++)
				{
					m_permTable1D.SetPixel(i, 1, new Color(0f, 0f, 0f, (float)m_perm[i] / 255f));
				}
				m_permTable1D.Apply();
			}
		}

		private void LoadPermTable2D()
		{
			if ((bool)m_permTable2D)
			{
				return;
			}
			m_permTable2D = new Texture2D(256, 256, TextureFormat.ARGB32, mipChain: false, linear: true);
			m_permTable2D.filterMode = FilterMode.Point;
			m_permTable2D.wrapMode = TextureWrapMode.Repeat;
			for (int i = 0; i < 256; i++)
			{
				for (int j = 0; j < 256; j++)
				{
					int num = m_perm[i] + j;
					int num2 = m_perm[num];
					int num3 = m_perm[num + 1];
					int num4 = m_perm[i + 1] + j;
					int num5 = m_perm[num4];
					int num6 = m_perm[num4 + 1];
					m_permTable2D.SetPixel(i, j, new Color((float)num2 / 255f, (float)num3 / 255f, (float)num5 / 255f, (float)num6 / 255f));
				}
			}
			m_permTable2D.Apply();
		}

		private void LoadGradient2D()
		{
			if (!m_gradient2D)
			{
				m_gradient2D = new Texture2D(8, 1, TextureFormat.RGB24, mipChain: false, linear: true);
				m_gradient2D.filterMode = FilterMode.Point;
				m_gradient2D.wrapMode = TextureWrapMode.Repeat;
				for (int i = 0; i < 8; i++)
				{
					float r = (GRADIENT2[i * 2] + 1f) * 0.5f;
					float g = (GRADIENT2[i * 2 + 1] + 1f) * 0.5f;
					m_gradient2D.SetPixel(i, 0, new Color(r, g, 0f, 1f));
				}
				m_gradient2D.Apply();
			}
		}

		private void LoadGradient3D()
		{
			if (!m_gradient3D)
			{
				m_gradient3D = new Texture2D(256, 1, TextureFormat.RGB24, mipChain: false, linear: true);
				m_gradient3D.filterMode = FilterMode.Point;
				m_gradient3D.wrapMode = TextureWrapMode.Repeat;
				for (int i = 0; i < 256; i++)
				{
					int num = m_perm[i] % 16;
					float r = (GRADIENT3[num * 3] + 1f) * 0.5f;
					float g = (GRADIENT3[num * 3 + 1] + 1f) * 0.5f;
					float b = (GRADIENT3[num * 3 + 2] + 1f) * 0.5f;
					m_gradient3D.SetPixel(i, 0, new Color(r, g, b, 1f));
				}
				m_gradient3D.Apply();
			}
		}

		private void LoadGradient4D()
		{
			if (!m_gradient4D)
			{
				m_gradient4D = new Texture2D(256, 1, TextureFormat.ARGB32, mipChain: false, linear: true);
				m_gradient4D.filterMode = FilterMode.Point;
				m_gradient4D.wrapMode = TextureWrapMode.Repeat;
				for (int i = 0; i < 256; i++)
				{
					int num = m_perm[i] % 32;
					float r = (GRADIENT4[num * 4] + 1f) * 0.5f;
					float g = (GRADIENT4[num * 4 + 1] + 1f) * 0.5f;
					float b = (GRADIENT4[num * 4 + 2] + 1f) * 0.5f;
					float a = (GRADIENT4[num * 4 + 3] + 1f) * 0.5f;
					m_gradient4D.SetPixel(i, 0, new Color(r, g, b, a));
				}
				m_gradient4D.Apply();
			}
		}
	}
}