public Connection(IStreamAccessor streamAccessor)
{
var stream = streamAccessor.Stream;
Reader = new EndianBinaryReader(EndianBitConverter.Big, stream);
Writer = new EndianBinaryWriter(EndianBitConverter.Big, stream);
RecordReaderStrategy = new PlaintextStrategy(this);
RecordWriterStrategy = new PlaintextStrategy(this);
}
public static VeldridGeometry Create(IMesh mesh)
{
var gpuMesh = mesh.ToGpuMesh();
var result = new VeldridGeometry();
var bufferViewToPrimitive = new Dictionary <IBufferView, VeldridPrimitive>();
var vertexBufferMemoryStream = new MemoryStream();
result.IndexFormat = Veldrid.IndexFormat.UInt16;
using (var vertexBufferWriter = new BinaryWriter(vertexBufferMemoryStream))
{
foreach (var bufferView in gpuMesh.BufferViews)
{
var veldridPrimitive = new VeldridPrimitive();
veldridPrimitive.VertexBufferOffset = (uint)vertexBufferMemoryStream.Position;
var streamKeys = bufferView.GetStreams().Select(_ => new SortableStreamKey(_)).OrderBy(_ => _)
.Select(_ => _.Key).ToList();
var elements = new VertexElementDescription[streamKeys.Count];
var accessors = new IStreamAccessor[streamKeys.Count];
for (var index = 0; index < streamKeys.Count; index++)
{
var reader = accessors[index] = GetAccessor(bufferView, streamKeys[index]);
elements[index] = new VertexElementDescription(streamKeys[index].ToString(),
VertexElementSemantic.TextureCoordinate, reader.VertexElementFormat);
}
var count = accessors[0].Count;
if (count > ushort.MaxValue)
{
result.IndexFormat = Veldrid.IndexFormat.UInt32;
}
for (var index = 0; index < count; index++)
{
for (var accessorIndex = 0; accessorIndex < accessors.Length; accessorIndex++)
{
accessors[accessorIndex].Write(index, vertexBufferWriter);
}
}
veldridPrimitive.VertexLayout = new VertexLayoutDescription(elements);
bufferViewToPrimitive.Add(bufferView, veldridPrimitive);
}
}
result.VertexBuffer = new Memory <byte>(vertexBufferMemoryStream.ToArray());
var indexBufferMemoryStream = new MemoryStream();
result.Primitives = new VeldridPrimitive[gpuMesh.Primitives.Count];
using (var indexBufferWriter = new BinaryWriter(indexBufferMemoryStream))
{
for (var primitiveIndex = 0; primitiveIndex < gpuMesh.Primitives.Count; primitiveIndex++)
{
var primitive = gpuMesh.Primitives[primitiveIndex];
var primitiveBase = bufferViewToPrimitive[primitive.BufferView];
var veldridPrimitive = new VeldridPrimitive()
{
VertexBufferOffset = primitiveBase.VertexBufferOffset,
PrimitiveTopology = GetTopology(primitive.Topology),
IndexBufferOffset = (uint)indexBufferMemoryStream.Position,
VertexLayout = primitiveBase.VertexLayout
};
if (result.IndexFormat == Veldrid.IndexFormat.UInt32)
{
foreach (var index in primitive)
{
indexBufferWriter.Write((uint)index);
}
}
else if (result.IndexFormat == Veldrid.IndexFormat.UInt16)
{
foreach (var index in primitive)
{
indexBufferWriter.Write((ushort)index);
}
}
else
{
throw new NotImplementedException();
}
result.Primitives[primitiveIndex] = veldridPrimitive;
}
}
result.IndexBuffer = new Memory <byte>(indexBufferMemoryStream.ToArray());
return(result);
}
