private int AddBuffer(Model model, IList <List <byte> > buffers, IList <int> accessors, string name,
int byteOffset, int?byteStride, TargetType?target, int boundarySize = 4)
{
var bufferIndex = model.Buffers.Count;
var bufferList = buffers.SelectMany(c => c).ToList();
var bufferLength = bufferList.Count;
if (!_options.GLB)
{
Document.Padding(bufferList, boundarySize);
var buffer = new NetGltf.Json.Buffer
{
ByteLength = bufferLength
};
model.Buffers.Add(buffer);
if (_options.SeparateBinary)
{
var binName = name + ".bin";
File.WriteAllBytes(Path.Combine(_gltfFolder, binName), bufferList.ToArray());
buffer.Uri = binName;
}
else
{
buffer.Uri = "data:application/octet-stream;base64," + Convert.ToBase64String(bufferList.ToArray());
}
}
else
{
_buffers.ByteOffset += bufferLength;
}
AddBufferView(model, buffers, accessors,
bufferIndex, byteOffset, byteStride, target);
byteOffset += bufferLength;
return(byteOffset);
}
/// <summary>
/// write model to filePath
/// </summary>
/// <param name="model"></param>
/// <param name="filePath"></param>
public void WriteModel(Model model, string filePath)
{
if (UriUtil.IsValidUri(model.Uri))
{
model.WriteUriFiles(filePath);
}
var ext = Path.GetExtension(filePath).TrimStart('.').ToUpper();
if (ext == "GLB")
{
using (var fs = new FileStream(filePath, FileMode.CreateNew, FileAccess.Write))
using (var bw = new BinaryWriter(fs))
{
var binCount = 0;
var byteLength = 0;
if (model.BinBuffers != null)
{
byteLength = model.BinBuffers.Count;
Padding(model.BinBuffers, 4);
binCount += model.BinBuffers.Count;
if (model.Buffers.Count == 0)
{
var buffer = new Json.Buffer();
model.Buffers.Add(buffer);
}
model.Buffers[0].ByteLength = byteLength;
}
var json = JsonUtil.ToJson(model);
var jsonBytes = new List <byte>(JsonUtil.StrEncoding.GetBytes(json));
PaddingSpace(jsonBytes, 4);
var len = GlbHeader.ByteCount + jsonBytes.Count + binCount + 8 + (binCount > 0 ? 8 : 0);
var header = GlbHeader.GetGlbHeader((uint)len);
header.Write(bw);
var jsonChunk = new ChunkHeader
{
ChunkType = ChunkType.Json,
Length = (uint)jsonBytes.Count
};
jsonChunk.Write(bw);
for (var i = 0; i < jsonBytes.Count; i++)
{
bw.Write(jsonBytes[i]);
}
if (model.BinBuffers != null)
{
var binChunk = new ChunkHeader
{
ChunkType = ChunkType.Bin,
Length = (uint)model.BinBuffers.Count
};
binChunk.Write(bw);
for (var i = 0; i < model.BinBuffers.Count; i++)
{
bw.Write(model.BinBuffers[i]);
}
}
bw.Flush();
}
}
else
{
JsonUtil.Serialize(model, filePath);
}
}
private int ResolveTexture(Model gltf, string textureFile)
{
var txtFile = GetObjTextureFullpath(textureFile);
if (!File.Exists(txtFile))
{
return(-1);
}
if (_textureDict.TryGetValue(txtFile, out var index))
{
return(index);
}
var name = Path.GetFileNameWithoutExtension(txtFile);
int imageIndex = -1;
if (_options.GLB)
{
var bytes = File.ReadAllBytes(txtFile);
_buffers.ImageBuffers.Add(bytes);
var bufferIndex = 0;
var bvIndex = gltf.BufferViews.Count;
var bufferView = new BufferView
{
Name = name,
Buffer = bufferIndex,
ByteLength = bytes.Length,
ByteOffset = _buffers.ByteOffset
};
gltf.BufferViews.Add(bufferView);
var image = new Image
{
Name = name,
BufferView = bvIndex,
MimeType = GetMimeType(txtFile)
};
imageIndex = gltf.Images.Count;
gltf.Images.Add(image);
_buffers.ByteOffset += bytes.Length;
}
else if (_options.SeparateTextures)
{
var uri = CopyTextureFile(txtFile);
var image = new Image {
Name = name,
Uri = uri,
MimeType = GetMimeType(txtFile)
};
imageIndex = gltf.Images.Count;
gltf.Images.Add(image);
}
else
{
var imageBytes = new List <byte>(File.ReadAllBytes(txtFile));
var byteLength = imageBytes.Count;
Document.Padding(imageBytes, 4);
var buffer = new NetGltf.Json.Buffer
{
ByteLength = imageBytes.Count
};
buffer.Uri = "data:application/octet-stream;base64," + Convert.ToBase64String(imageBytes.ToArray());
var bufferIndex = gltf.Buffers.Count;
gltf.Buffers.Add(buffer);
var bufferView = new BufferView
{
Name = name,
Buffer = bufferIndex,
ByteLength = byteLength,
ByteOffset = 0
};
var bvIndex = gltf.BufferViews.Count;
gltf.BufferViews.Add(bufferView);
var image = new Image
{
Name = name,
BufferView = bvIndex,
MimeType = GetMimeType(txtFile)
};
imageIndex = gltf.Images.Count;
gltf.Images.Add(image);
}
var tIndex = gltf.Textures.Count;
gltf.Textures.Add(new Texture
{
Source = imageIndex,
Sampler = 0
});
_textureDict.Add(txtFile, tIndex);
return(gltf.Textures.Count - 1);
}
