KTX.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.IO;

using Android.App;
using Android.Content;
using Android.OS;
using Android.Runtime;
using Android.Views;
using Android.Widget;

namespace Mono.Samples.TexturedCube
{
    class KTX
    {
        public struct KTXHeader
        {
            public Byte[] identifier;
            public Byte[] endianness;
            public UInt32 glType;
            public UInt32 glTypeSize;
            public UInt32 glFormat;
            public UInt32 glInternalFormat;
            public UInt32 glBaseInternalFormat;
            public UInt32 pixelWidth;
            public UInt32 pixelHeight;
            public UInt32 pixelDepth;
            public UInt32 numberOfArrayElements;
            public UInt32 numberOfFaces;
            public UInt32 numberOfMipmapLevels;
            public UInt32 bytesOfKeyValueData;
        }

        public struct KTXMetadata
        {
            public UInt32? keyAndValueByteSize;
            public Byte[] keyAndValue;
            public Byte[] valuePadding;
        }

        public static byte[] Load(Stream rawdata, out KTXHeader ktxheader,out KTXMetadata ktxmetadata)
        {
            byte[] imagedata;

            using (var ms = new MemoryStream())
            {
                rawdata.CopyTo(ms);
                int Length = ms.ToArray().Length;
                ms.Seek(0, SeekOrigin.Begin);

                //ヘッダの読み込み
                //イメージデータの取得
                using (var br = new BinaryReader(ms))
                {
                    ktxheader.identifier = br.ReadBytes(12);
                    ktxheader.endianness = br.ReadBytes(4);
                    ktxheader.glType = br.ReadUInt32();
                    ktxheader.glTypeSize = br.ReadUInt32();
                    ktxheader.glFormat = br.ReadUInt32();
                    ktxheader.glInternalFormat = br.ReadUInt32();
                    ktxheader.glBaseInternalFormat = br.ReadUInt32();
                    ktxheader.pixelWidth = br.ReadUInt32();
                    ktxheader.pixelHeight = br.ReadUInt32();
                    ktxheader.pixelDepth = br.ReadUInt32();
                    ktxheader.numberOfArrayElements = br.ReadUInt32();
                    ktxheader.numberOfFaces = br.ReadUInt32();
                    ktxheader.numberOfMipmapLevels = br.ReadUInt32();
                    ktxheader.bytesOfKeyValueData = br.ReadUInt32();
                    if (ktxheader.bytesOfKeyValueData != 0)
                    {
                        ktxmetadata.keyAndValueByteSize = br.ReadUInt32();
                        ktxmetadata.keyAndValue = br.ReadBytes((int)ktxmetadata.keyAndValueByteSize);
                        ktxmetadata.valuePadding = br.ReadBytes(3 - (((int)ktxmetadata.keyAndValueByteSize + 3) % 4));
                    }
                    else
                    {
                        ktxmetadata.keyAndValueByteSize = null;
                        ktxmetadata.keyAndValue = null;
                        ktxmetadata.valuePadding = null;
                    }

                    //headersize(64) +bytesOfKeyValueData
                    int datasize = Length - 64 + (int)ktxheader.bytesOfKeyValueData;
                    imagedata = new byte[datasize];
                    imagedata = br.ReadBytes(datasize);
                }
            }

            return imagedata;

        }
    }
}