using System;
using System.IO;
using UnityEngine;

namespace Artngame.SKYMASTER
{
	public class TGALoader
	{
		public static Texture3D load3DFromTGASlices(TextAsset asset)
		{
			using BinaryReader binaryReader = new BinaryReader(new MemoryStream(asset.bytes));
			binaryReader.BaseStream.Seek(12L, SeekOrigin.Begin);
			short num = binaryReader.ReadInt16();
			short num2 = binaryReader.ReadInt16();
			int num3 = num2 * num2;
			int num4 = binaryReader.ReadByte();
			binaryReader.BaseStream.Seek(1L, SeekOrigin.Current);
			Color32[] array = new Color32[num * num2];
			Texture3D texture3D;
			switch (num4)
			{
			case 32:
			{
				for (int j = 0; j < array.Length; j++)
				{
					byte a = binaryReader.ReadByte();
					byte b2 = binaryReader.ReadByte();
					byte g2 = binaryReader.ReadByte();
					byte r2 = binaryReader.ReadByte();
					int num8 = j % num % num2;
					int num9 = j / num;
					int num10 = j % num / num2 * num3 + num9 * num2 + num8;
					array[num10] = new Color32(r2, g2, b2, a);
				}
				texture3D = new Texture3D(num2, num2, num2, TextureFormat.RGBA32, mipChain: true);
				break;
			}
			case 24:
			{
				for (int i = 0; i < array.Length; i++)
				{
					byte b = binaryReader.ReadByte();
					byte g = binaryReader.ReadByte();
					byte r = binaryReader.ReadByte();
					int num5 = i % num % num2;
					int num6 = i / num;
					int num7 = i % num / num2 * num3 + num6 * num2 + num5;
					array[num7] = new Color32(r, g, b, 1);
				}
				texture3D = new Texture3D(num2, num2, num2, TextureFormat.RGB24, mipChain: true);
				break;
			}
			default:
				throw new Exception("TGA texture had non 32/24 bit depth.");
			}
			texture3D.SetPixels32(array, 0);
			texture3D.wrapMode = TextureWrapMode.Repeat;
			texture3D.filterMode = FilterMode.Bilinear;
			texture3D.Apply();
			return texture3D;
		}
	}
}