private static uint LoadBufferView(AttributeAccessor attributeAccessor, out byte[] bufferViewCache)
{
BufferView bufferView = attributeAccessor.AccessorId.Value.BufferView.Value;
uint totalOffset = bufferView.ByteOffset + attributeAccessor.Offset;
#if !NETFX_CORE
if (attributeAccessor.Stream is System.IO.MemoryStream)
{
MemoryStream memoryStream = (MemoryStream)attributeAccessor.Stream;
#if NETFX_CORE || NETSTANDARD1_3
if (memoryStream.TryGetBuffer(out System.ArraySegment <byte> arraySegment))
{
bufferViewCache = arraySegment.Array;
return(totalOffset);
}
#else
bufferViewCache = memoryStream.GetBuffer();
return(totalOffset);
#endif
}
#endif
attributeAccessor.Stream.Position = totalOffset;
bufferViewCache = new byte[bufferView.ByteLength];
// stream.Read only accepts int for length
uint remainingSize = bufferView.ByteLength;
while (remainingSize != 0)
{
int sizeToLoad = (int)System.Math.Min(remainingSize, int.MaxValue);
attributeAccessor.Stream.Read(bufferViewCache, (int)(bufferView.ByteLength - remainingSize), sizeToLoad);
remainingSize -= (uint)sizeToLoad;
}
return(0);
}
private static long LoadBufferView(AttributeAccessor attributeAccessor, out byte[] bufferViewCache)
{
BufferView bufferView = attributeAccessor.AccessorId.Value.BufferView.Value;
long totalOffset = bufferView.ByteOffset + attributeAccessor.Offset;
if (attributeAccessor.Stream is System.IO.MemoryStream)
{
using (var memoryStream = attributeAccessor.Stream as System.IO.MemoryStream)
{
#if NETFX_CORE || NETSTANDARD1_3
if (memoryStream.TryGetBuffer(out System.ArraySegment <byte> arraySegment))
{
bufferViewCache = arraySegment.Array;
return(totalOffset);
}
#else
bufferViewCache = memoryStream.GetBuffer();
return(totalOffset);
#endif
}
}
attributeAccessor.Stream.Position = totalOffset;
bufferViewCache = new byte[bufferView.ByteLength];
attributeAccessor.Stream.Read(bufferViewCache, 0, bufferView.ByteLength);
return(0);
}
private BufferViewId ExportBufferView(int byteOffset, int byteLength)
{
var bufferView = new BufferView {
Buffer = _bufferId,
ByteOffset = byteOffset,
ByteLength = byteLength,
};
var id = new BufferViewId {
Id = _root.BufferViews.Count,
Root = _root
};
_root.BufferViews.Add(bufferView);
return(id);
}
private static long LoadBufferView(AttributeAccessor attributeAccessor, out byte[] bufferViewCache)
{
BufferView bufferView = attributeAccessor.AccessorId.Value.BufferView.Value;
long totalOffset = bufferView.ByteOffset + attributeAccessor.Offset;
#if !NETFX_CORE
if (attributeAccessor.Stream is System.IO.MemoryStream)
{
using (var memoryStream = attributeAccessor.Stream as System.IO.MemoryStream)
{
bufferViewCache = memoryStream.GetBuffer();
return(totalOffset);
}
}
#endif
attributeAccessor.Stream.Position = totalOffset;
bufferViewCache = new byte[bufferView.ByteLength];
attributeAccessor.Stream.Read(bufferViewCache, 0, bufferView.ByteLength);
return(0);
}
public static BufferView Deserialize(GLTFRoot root, JsonReader reader)
{
var bufferView = new BufferView();
while (reader.Read() && reader.TokenType == JsonToken.PropertyName)
{
var curProp = reader.Value.ToString();
switch (curProp)
{
case "buffer":
bufferView.Buffer = BufferId.Deserialize(root, reader);
break;
case "byteOffset":
bufferView.ByteOffset = reader.ReadAsInt32().Value;
break;
case "byteLength":
bufferView.ByteLength = reader.ReadAsInt32().Value;
break;
case "byteStride":
bufferView.ByteStride = reader.ReadAsInt32().Value;
break;
case "target":
bufferView.Target = (BufferViewTarget)reader.ReadAsInt32().Value;
break;
default:
bufferView.DefaultPropertyDeserializer(root, reader);
break;
}
}
return(bufferView);
}
/// <summary>
/// Removes a blob from the GLB at the given BufferView
/// Updates accessors and images to have correct new bufferview index
/// This function can invalidate BufferViewId's returned by previous function
/// </summary>
/// <param name="glb">The glb to remove from</param>
/// <param name="bufferViewId">The buffer to remove</param>
public static void RemoveBinaryData(GLBObject glb, BufferViewId bufferViewId)
{
if (glb == null)
{
throw new ArgumentNullException(nameof(glb));
}
if (bufferViewId == null)
{
throw new ArgumentNullException(nameof(bufferViewId));
}
BufferView bufferViewToRemove = bufferViewId.Value;
int id = bufferViewId.Id;
if (bufferViewToRemove.ByteOffset + bufferViewToRemove.ByteLength == glb.BinaryChunkInfo.Length)
{
uint bufferViewLengthAsUint = bufferViewToRemove.ByteLength;
glb.SetFileLength(glb.Header.FileLength - bufferViewLengthAsUint);
glb.SetBinaryChunkLength(glb.BinaryChunkInfo.Length - bufferViewLengthAsUint);
if (glb.BinaryChunkInfo.Length == 0)
{
glb.Root.Buffers.RemoveAt(0);
foreach (BufferView bufferView in glb.Root.BufferViews) // other buffers may still exist, and their index has now changed
{
--bufferView.Buffer.Id;
}
glb.SetFileLength(glb.Header.FileLength - GLTFParser.CHUNK_HEADER_SIZE);
}
else
{
glb.Root.Buffers[0].ByteLength = glb.BinaryChunkInfo.Length;
// write binary chunk header
WriteChunkHeader(glb.Stream, glb.BinaryChunkInfo);
}
// trim the end
glb.Stream.SetLength(glb.Header.FileLength);
// write glb header
WriteHeader(glb.Stream, glb.Header, glb.StreamStartPosition);
}
glb.Root.BufferViews.RemoveAt(id);
if (glb.Root.Accessors != null)
{
foreach (Accessor accessor in glb.Root.Accessors) // shift over all accessors
{
if (accessor.BufferView != null && accessor.BufferView.Id >= id)
{
--accessor.BufferView.Id;
}
if (accessor.Sparse != null)
{
if (accessor.Sparse.Indices?.BufferView.Id >= id)
{
--accessor.Sparse.Indices.BufferView.Id;
}
if (accessor.Sparse.Values?.BufferView.Id >= id)
{
--accessor.Sparse.Values.BufferView.Id;
}
}
}
}
if (glb.Root.Images != null)
{
foreach (GLTFImage image in glb.Root.Images)
{
if (image.BufferView != null && image.BufferView.Id >= id)
{
--image.BufferView.Id;
}
}
}
}
private static BufferViewId _AddBinaryData(GLBObject glb, Stream binaryData, bool createBufferView, long streamStartPosition, string bufferViewName = null)
{
binaryData.Position = streamStartPosition;
// Append new binary chunk to end
uint blobLengthAsUInt = CalculateAlignment((uint)(binaryData.Length - streamStartPosition), 4);
uint newBinaryBufferSize = glb.BinaryChunkInfo.Length + blobLengthAsUInt;
uint newGLBSize = glb.Header.FileLength + blobLengthAsUInt;
uint blobWritePosition = glb.Header.FileLength;
// there was an existing file that had no binary chunk info previously
if (glb.BinaryChunkInfo.Length == 0)
{
newGLBSize += GLTFParser.CHUNK_HEADER_SIZE;
blobWritePosition += GLTFParser.CHUNK_HEADER_SIZE;
glb.SetBinaryChunkStartPosition(glb.Header.FileLength); // if 0, then appends chunk info at the end
}
glb.Stream.SetLength(glb.Header.FileLength + blobLengthAsUInt);
glb.Stream.Position = blobWritePosition; // assuming the end of the file is the end of the binary chunk
binaryData.CopyTo(glb.Stream); // make sure this doesn't supersize it
glb.SetFileLength(newGLBSize);
glb.SetBinaryChunkLength(newBinaryBufferSize);
// write glb header past magic number
WriteHeader(glb.Stream, glb.Header, glb.StreamStartPosition);
WriteChunkHeader(glb.Stream, glb.BinaryChunkInfo);
if (createBufferView)
{
// Add a new BufferView to the GLTFRoot
BufferView bufferView = new BufferView
{
Buffer = new BufferId
{
Id = 0,
Root = glb.Root
},
ByteLength = blobLengthAsUInt, // figure out whether glb size is wrong or if documentation is unclear
ByteOffset = glb.BinaryChunkInfo.Length - blobLengthAsUInt,
Name = bufferViewName
};
if (glb.Root.BufferViews == null)
{
glb.Root.BufferViews = new List <BufferView>();
}
glb.Root.BufferViews.Add(bufferView);
return(new BufferViewId
{
Id = glb.Root.BufferViews.Count - 1,
Root = glb.Root
});
}
return(null);
}
public static GLTFRoot Deserialize(JsonReader reader)
{
var root = new GLTFRoot();
if (reader.Read() && reader.TokenType != JsonToken.StartObject)
{
throw new Exception("glTF JSON must be an object");
}
while (reader.Read() && reader.TokenType == JsonToken.PropertyName)
{
var curProp = reader.Value.ToString();
switch (curProp)
{
case "extensionsUsed":
root.ExtensionsUsed = reader.ReadStringList();
break;
case "extensionsRequired":
root.ExtensionsRequired = reader.ReadStringList();
break;
case "accessors":
root.Accessors = reader.ReadList(() => Accessor.Deserialize(root, reader));
break;
case "animations":
root.Animations = reader.ReadList(() => GLTFAnimation.Deserialize(root, reader));
break;
case "asset":
root.Asset = Asset.Deserialize(root, reader);
break;
case "buffers":
root.Buffers = reader.ReadList(() => Buffer.Deserialize(root, reader));
break;
case "bufferViews":
root.BufferViews = reader.ReadList(() => BufferView.Deserialize(root, reader));
break;
case "cameras":
root.Cameras = reader.ReadList(() => GLTFCamera.Deserialize(root, reader));
break;
case "images":
root.Images = reader.ReadList(() => Image.Deserialize(root, reader));
break;
case "materials":
root.Materials = reader.ReadList(() => Material.Deserialize(root, reader));
break;
case "meshes":
root.Meshes = reader.ReadList(() => Mesh.Deserialize(root, reader));
break;
case "nodes":
root.Nodes = reader.ReadList(() => Node.Deserialize(root, reader));
break;
case "samplers":
root.Samplers = reader.ReadList(() => Sampler.Deserialize(root, reader));
break;
case "scene":
root.Scene = SceneId.Deserialize(root, reader);
break;
case "scenes":
root.Scenes = reader.ReadList(() => GLTF.Scene.Deserialize(root, reader));
break;
case "skins":
root.Skins = reader.ReadList(() => Skin.Deserialize(root, reader));
break;
case "textures":
root.Textures = reader.ReadList(() => Texture.Deserialize(root, reader));
break;
default:
root.DefaultPropertyDeserializer(root, reader);
break;
}
}
return(root);
}
