private StreamIO getBufferStream(GltfAccessor accessor)
{
GltfBufferView bufferView = _root.BufferViews[accessor.BufferView.Value];
GltfBuffer buffer = _root.Buffers[bufferView.Buffer];
StreamIO stream = new StreamIO(_chunk.GetBytes(0, buffer.ByteLength));
stream.Position = bufferView.ByteOffset + accessor.ByteOffset;
return(stream);
}
private static GltfBufferView[] ExtractBufferViews(glTFLoader.Schema.Gltf model)
{
var noOfItems = model.BufferViews != null ? model.BufferViews.Length : 0;
var output = new GltfBufferView[noOfItems];
for (var i = 0; i < noOfItems; i += 1)
{
output[i] = new GltfBufferView(model.BufferViews[i]);
}
return(output);
}
private static void ConstructBufferView(this GltfObject gltfObject, GltfBufferView bufferView)
{
bufferView.Buffer = gltfObject.buffers[bufferView.buffer];
if (bufferView.Buffer.BufferData == null &&
!string.IsNullOrEmpty(gltfObject.Uri) &&
!string.IsNullOrEmpty(bufferView.Buffer.uri))
{
var parentDirectory = Directory.GetParent(gltfObject.Uri).FullName;
bufferView.Buffer.BufferData = File.ReadAllBytes($"{parentDirectory}\\{bufferView.Buffer.uri}");
}
}
public GltfBufferView Extend(Memory <byte> array, int stride, GltfBufferTargetType target)
{
var tmp = m_bytes;
// alignment
var padding = m_used % stride == 0 ? 0 : stride - m_used % stride;
if (m_bytes == null || m_used + padding + array.Length > m_bytes.Length)
{
// recreate buffer
var newSize = Math.Max(m_used + padding + array.Length, m_bytes.Length * 2);
m_bytes = new Byte[newSize];
if (m_used > 0)
{
// Buffer.BlockCopy(tmp, 0, m_bytes, 0, m_used);
tmp.AsSpan().Slice(0, m_used).CopyTo(m_bytes);
}
}
if (m_used + padding + array.Length > m_bytes.Length)
{
throw new ArgumentOutOfRangeException();
}
array.CopyTo(m_bytes.AsMemory().Slice(m_used + padding, array.Length));
var result = new GltfBufferView
{
buffer = 0,
byteLength = array.Length,
byteOffset = m_used + padding,
target = target,
};
if (target == GltfBufferTargetType.ARRAY_BUFFER)
{
result.byteStride = stride;
}
m_used = m_used + padding + array.Length;
return(result);
}
public Memory <byte> GetBufferBytes(GltfBufferView view)
{
return(GetBufferBytes(Gltf.buffers[view.buffer]));
}
