/// <summary>
/// Constructor. Creates a data structure out of the XFile given in the memory block.
/// </summary>
/// <param name="buffer"></param>
public XFileParser(byte[] buffer)
{
this.buffer = buffer;
majorVersion = minorVersion = 0;
isBinaryFormat = false;
binaryNumCount = 0;
p = end = -1;
lineNumber = 0;
scene = null;
// vector to store uncompressed file for INFLATE'd X files
byte[] uncompressed;
// set up memory pointers
p = 0;
end = buffer.Length;
string header = Encoding.Default.GetString(buffer, 0, 16);
// check header
if (header.Substring(0, 4) != "xof ")
throw new Exception("Header mismatch, file is not an XFile.");
// read version. It comes in a four byte format such as "0302"
majorVersion = uint.Parse(header.Substring(4, 2));
minorVersion = uint.Parse(header.Substring(6, 2));
bool compressed = false;
// txt - pure ASCII text format
if (header.Substring(8, 4) == "txt ")
{
isBinaryFormat = false;
}// bin - Binary format
else if (header.Substring(8, 4) == "bin ")
{
isBinaryFormat = true;
}
// tzip - Inflate compressed text format
else if (header.Substring(8, 4) == "tzip")
{
isBinaryFormat = false;
compressed = true;
}
// bzip - Inflate compressed binary format
else if (header.Substring(8, 4) == "bzip")
{
isBinaryFormat = true;
compressed = true;
}
else ThrowException(string.Format("Unsupported xfile format '{0}'", header.Substring(8, 4)));
// float size
binaryFloatSize = uint.Parse(header.Substring(12, 4));
if (binaryFloatSize != 32 && binaryFloatSize != 64)
ThrowException(string.Format("Unknown float size {0} specified in xfile header.", binaryFloatSize));
// The x format specifies size in bits, but we work in bytes
binaryFloatSize /= 8;
p += 16;
// If this is a compressed X file, apply the inflate algorithm to it
if (compressed)
{
//throw (new Exception("Assimp was built without compressed X support"));
MemoryStream stream = new MemoryStream(buffer);
stream.Position += 16;
stream.Position += 6;
long p1 = stream.Position;
uint estOut = 0;
while (p1 + 3 < end)
{
ushort ofs = BitConverter.ToUInt16(buffer, (int)p1);
p1 += 2;
if (ofs >= MSZIP_BLOCK)
{
throw (new Exception("X: Invalid offset to next MSZIP compressed block"));
}
ushort magic = BitConverter.ToUInt16(buffer, (int)p1);
p1 += 2;
if (magic != MSZIP_MAGIC)
{
throw (new Exception("X: Unsupported compressed format, expected MSZIP header"));
}
p1 += ofs;
estOut += MSZIP_BLOCK;
}
uncompressed = new byte[estOut + 1];
int uncompressedEnd = 0;
while (p + 3 < end)
{
ushort ofs = BitConverter.ToUInt16(buffer, (int)p);
p += 4;
if (p + ofs > end + 2)
{
throw (new Exception("X: Unexpected EOF in compressed chunk"));
}
stream.Position = p;
DeflateStream uncomp = new DeflateStream(stream, CompressionMode.Decompress);
int readLnegth = uncomp.Read(uncompressed, 0, (int)MSZIP_BLOCK);
uncompressedEnd += readLnegth;
p += ofs;
}
this.buffer = uncompressed;
this.end = uncompressedEnd;
this.p = 0;
}
else
{
// start reading here
ReadUntilEndOfLine();
}
scene = new Scene();
ParseFile();
// filter the imported hierarchy for some degenerated cases
if (scene.RootNode != null)
{
FilterHierarchy(scene.RootNode);
}
}
/// <summary>
/// Constructs the return data structure out of the imported data.
/// </summary>
/// <param name="scene">The scene to construct the return data in.</param>
/// <param name="sdata">The imported data in the internal temporary representation.</param>
protected void CreateDataRepresentationFromImport(AssimpSharp.Scene scene, Scene data)
{
// Read the global materials first so that meshes referring to them can find them later
ConvertMaterials(scene, data.GlobalMaterial);
// copy nodes, extracting meshes and materials on the way
scene.RootNode = CreateNodes(scene, null, data.RootNode);
// extract animations
CreateAnimations(scene, data);
// read the global meshes that were stored outside of any node
if (data.GlobalMeshes.Count > 0)
{
// create a root node to hold them if there isn't any, yet
if (scene.RootNode == null)
{
scene.RootNode = new AssimpSharp.Node();
scene.RootNode.Name = "$dummy_node";
}
// convert all global meshes and store them in the root node.
// If there was one before, the global meshes now suddenly have its transformation matrix...
// Don't know what to do there, I don't want to insert another node under the present root node
// just to avoid this.
CreateMeshes(scene, scene.RootNode, data.GlobalMeshes);
}
if (scene.RootNode == null)
{
throw (new DeadlyImportError("No root node"));
}
// Convert everything to OpenGL space... it's the same operation as the conversion back, so we can reuse the step directly
var convertProcess = new MakeLeftHandedProcess();
convertProcess.Execute(scene);
var flipper = new FlipWindingOrderProcess();
flipper.Execute(scene);
// finally: create a dummy material if not material was imported
if (scene.Materials.Count == 0)
{
var mat = new aiMaterial();
mat.ShadingMode = ShadingMode.Gouraud;
mat.ColorEmissive = new Color4(0, 0, 0, 1);
mat.ColorSpecular = new Color4(0, 0, 0, 1);
mat.ColorDiffuse = new Color4(0.5f, 0.5f, 0.5f, 1);
mat.Shininess = 1.401298e-45f;
scene.Materials.Add(mat);
}
}
