1 files changed, 119 insertions, 0 deletions
diff --git a/MipTexMap.cs b/MipTexMap.cs
new file mode 100644
index 0000000..57b6abc
--- /dev/null
+++ b/MipTexMap.cs
@@ -0,0 +1,119 @@
+using UnityEngine;
+
+public class MipTexMap : MonoBehaviour
+{
+	private static Texture2D mipFilterTex64;
+
+	private static Texture2D mipFilterTex128;
+
+	private static Texture2D mipFilterTex256;
+
+	private static Texture2D mipFilterTex512;
+
+	private static Texture2D mipFilterTex1024;
+
+	private static Texture2D mipFilterTex2048;
+
+	private static void BuildMipFilterTex(int size)
+	{
+		size = Mathf.ClosestPowerOfTwo(size);
+		Texture2D texture2D = new Texture2D(size, size, TextureFormat.Alpha8, mipmap: true);
+		texture2D.anisoLevel = 3;
+		texture2D.filterMode = FilterMode.Trilinear;
+		texture2D.mipMapBias = 0f;
+		for (int i = 0; i < texture2D.mipmapCount; i++)
+		{
+			int num = size * size;
+			Color[] array = new Color[num];
+			float num2 = 1f * (float)i / (float)(texture2D.mipmapCount - 1);
+			Color color = new Color(num2, num2, num2, num2);
+			for (int j = 0; j < num; j++)
+			{
+				array[j] = color;
+			}
+			texture2D.SetPixels(array, i);
+		}
+		texture2D.Apply(updateMipmaps: false, makeNoLongerReadable: true);
+		switch (size)
+		{
+		case 64:
+			mipFilterTex64 = texture2D;
+			break;
+		case 128:
+			mipFilterTex128 = texture2D;
+			break;
+		case 256:
+			mipFilterTex256 = texture2D;
+			break;
+		case 512:
+			mipFilterTex512 = texture2D;
+			break;
+		case 1024:
+			mipFilterTex1024 = texture2D;
+			break;
+		case 2048:
+			mipFilterTex2048 = texture2D;
+			break;
+		default:
+			mipFilterTex512 = texture2D;
+			break;
+		}
+	}
+
+	public static Texture2D GetTex(int size)
+	{
+		size = Mathf.ClosestPowerOfTwo(size);
+		switch (size)
+		{
+		case 64:
+			if ((bool)mipFilterTex64)
+			{
+				return mipFilterTex64;
+			}
+			BuildMipFilterTex(size);
+			return mipFilterTex64;
+		case 128:
+			if ((bool)mipFilterTex128)
+			{
+				return mipFilterTex128;
+			}
+			BuildMipFilterTex(size);
+			return mipFilterTex128;
+		case 256:
+			if ((bool)mipFilterTex256)
+			{
+				return mipFilterTex256;
+			}
+			BuildMipFilterTex(size);
+			return mipFilterTex256;
+		case 512:
+			if ((bool)mipFilterTex512)
+			{
+				return mipFilterTex512;
+			}
+			BuildMipFilterTex(size);
+			return mipFilterTex512;
+		case 1024:
+			if ((bool)mipFilterTex1024)
+			{
+				return mipFilterTex1024;
+			}
+			BuildMipFilterTex(size);
+			return mipFilterTex1024;
+		case 2048:
+			if ((bool)mipFilterTex2048)
+			{
+				return mipFilterTex2048;
+			}
+			BuildMipFilterTex(size);
+			return mipFilterTex2048;
+		default:
+			if ((bool)mipFilterTex512)
+			{
+				return mipFilterTex512;
+			}
+			BuildMipFilterTex(size);
+			return mipFilterTex512;
+		}
+	}
+}