public byte[] AlphaMap_Compressed(MemoryStream ADTtexstream) // compressed
{
StreamTools s = new StreamTools();
byte[] textureArray = new byte[4096];
int alphaOffset = 0;
while (alphaOffset < 4096)
{
//read a byte//
byte onebyte = (byte)ADTtexstream.ReadByte();
//translate byte to 8 bits//
byte[] bytearr = new byte[1];
bytearr[0] = onebyte;
BitArray bitarr = new BitArray(bytearr);
//is first bit true?//
bool fc = bitarr.Get(7); //true=fill, false=copy
//next 7 bits determine how many times we fill/copy, max 127
int[] array = new int[1];
bool[] bitArray = new bool[7];
for (int i = 0; i < 7; i++)
{
bitArray[i] = bitarr.Get(6 - i);
}
int times = s.BoolArrayToInt(bitArray);
if (times == 0)
{
alphaOffset = 4096;
break;
}
if (times != 0)
{
//fill mode//
if (fc == true) // repeat the byte following the one we just read *count* number of times into the alpha map
{
byte secondbytefill = (byte)ADTtexstream.ReadByte();
for (int j = 0; j < times; j++)
{
textureArray[alphaOffset] = secondbytefill;
alphaOffset++;
}
}
//copy mode//
if (fc == false) // read *count* number of following bytes into the alpha map
{
for (int jc = 0; jc < times; jc++)
{
byte secondbytecopy = (byte)ADTtexstream.ReadByte();
textureArray[alphaOffset] = secondbytecopy;
alphaOffset++;
}
}
}
}
alphaOffset = 0;
return(textureArray);
}