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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;
}
}
}
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