public static void ReadTXID(BinaryReader reader, M2Model model, uint chunkSize)
{
var txidSize = chunkSize / 4;
for (var i = 0; i < txidSize; ++i)
{
var fileDataId = reader.ReadUInt32();
if (!TextureFileIds.Contains(fileDataId))
{
var m2Texture = new M2Texture();
var textureData = new TextureData();
using (var blpStream = CASC.OpenFile(fileDataId))
{
var blp = new BLP();
var blpData = blp.GetUncompressed(blpStream);
var blpInfo = blp.GetInfo();
textureData.HasMipmaps = blpInfo.hasMipmaps;
textureData.Width = blpInfo.width;
textureData.Height = blpInfo.height;
textureData.RawData = blpData;
textureData.TextureFormat = blpInfo.textureFormat;
m2Texture.TextureData = textureData;
m2Texture.FileDataId = fileDataId;
TextureFileIds.Add(fileDataId);
}
model.Textures.Add(m2Texture);
}
}
}
public static void ReadM2(uint fileDataId, M2Model model)
{
var stream = CASC.OpenFile(fileDataId);
if (stream == null)
{
return;
}
using (var reader = new BinaryReader(stream))
{
while (reader.BaseStream.Position < reader.BaseStream.Length)
{
var chunkId = (Chunks)reader.ReadUInt32().Flip();
var chunkSize = reader.ReadUInt32();
switch (chunkId)
{
case Chunks.MD21:
ReadMD20(reader, model);
reader.BaseStream.Position = 8 + chunkSize;
break;
case Chunks.SFID:
ReadSFID(reader, chunkSize);
break;
case Chunks.TXID:
ReadTXID(reader, model, chunkSize);
break;
default:
reader.Skip(chunkSize);
Debug.Log($"Skipping {chunkId} (0x{chunkId:X}) with size: {chunkSize}..");
break;
}
}
}
}
public static void ReadMD20(BinaryReader reader, M2Model model)
{
var magic = reader.ReadUInt32().Flip();
if (magic != (uint)Chunks.MD20)
{
throw new Exception($"{model.FileDataId} has invalid MD20 magic! {magic:X}");
}
var version = reader.ReadUInt32();
if (version < 272)
{
throw new Exception($"{model.FileDataId} has invalid version! {version}");
}
// Get the model name
var name = reader.ReadM2Array();
var oldPos = reader.BaseStream.Position;
reader.BaseStream.Position = name.Offset + 8;
model.ModelName = new string(reader.ReadChars((int)name.Size)).Replace("\0", "");
reader.BaseStream.Position = oldPos;
var flags = reader.ReadUInt32();
var globalLoops = reader.ReadM2Array();
var sequences = reader.ReadM2Array();
var sequencesLookups = reader.ReadM2Array();
var bones = reader.ReadM2Array();
var keyBoneLookup = reader.ReadM2Array();
var vertices = reader.ReadM2Array();
var skinCount = reader.ReadInt32();
var colors = reader.ReadM2Array();
var textures = reader.ReadM2Array();
var textureWeights = reader.ReadM2Array();
var textureTransforms = reader.ReadM2Array();
var replacableTextureLookup = reader.ReadM2Array();
var materials = reader.ReadM2Array();
var boneLookupTable = reader.ReadM2Array();
var textureLookupTable = reader.ReadM2Array();
reader.BaseStream.Position = 8 + vertices.Offset;
for (var i = 0; i < vertices.Size; ++i)
{
var position = new Vector3
{
x = reader.ReadSingle() / WorldConstants.WorldScale,
y = reader.ReadSingle() / WorldConstants.WorldScale,
z = reader.ReadSingle() / WorldConstants.WorldScale,
};
model.MeshData.Vertices.Add(new Vector3(-position.x, position.z, -position.y));
model.MeshData.BoneWeights.Add(new []
{
reader.ReadByte() / 255.0f,
reader.ReadByte() / 255.0f,
reader.ReadByte() / 255.0f,
reader.ReadByte() / 255.0f
});
model.MeshData.BoneIndices.Add(new int[] { reader.ReadByte(), reader.ReadByte(), reader.ReadByte(), reader.ReadByte() });
var normalPosition = new Vector3
{
x = reader.ReadSingle() * WorldConstants.WorldScale,
y = reader.ReadSingle() * WorldConstants.WorldScale,
z = reader.ReadSingle() * WorldConstants.WorldScale
};
model.MeshData.Normals.Add(new Vector3(-normalPosition.x, normalPosition.z, -normalPosition.y));
model.MeshData.TexCoords.Add(new Vector2(reader.ReadSingle(), reader.ReadSingle()));
model.MeshData.TexCoords2.Add(new Vector2(reader.ReadSingle(), reader.ReadSingle()));
}
reader.BaseStream.Position = 8 + textureLookupTable.Offset;
for (var i = 0; i < textureLookupTable.Size; ++i)
{
model.TextureLookupTable.Add(reader.ReadUInt16());
}
}