/// <summary>
/// Performs a lookup based on the contents of the passed byte buffer. If the byte contents match a known string, the cached string instance is returned.
/// Otherwise a new string is created by decoding the buffer contents.
/// </summary>
/// <param name="buffer">The byte array segment to read from</param>
/// <returns>A string instance that match the decoded value of the passed byte buffer.</returns>
public string DecodeString(ArraySegment <byte> buffer)
{
var searchKey = new BufferKey(buffer);
string knownString;
if (this.knownStrings.TryGetValue(searchKey, out knownString))
{
return(knownString);
}
return(Encoding.UTF8.GetString(buffer.Array, buffer.Offset, buffer.Count));
}
/// <summary>
/// Adds a known string. Must be called before it is set to Encoder.StringDecoder.
/// </summary>
/// <param name="knownString">The known string instance</param>
public void AddWellknownString(string knownString)
{
if (knownString == null)
{
throw new ArgumentNullException("knownString");
}
byte[] encodedString = Encoding.UTF8.GetBytes(knownString);
var key = new BufferKey(encodedString);
this.knownStrings[key] = knownString;
}
public VertexBuffer GetVertexBuffer(MeshData mesh)
{
VertexBuffer vb;
BufferKey key = new BufferKey(mesh);
if (!_vbs.TryGetValue(key, out vb))
{
vb = mesh.CreateVertexBuffer(_factory);
if (!_vbs.TryAdd(key, vb))
{
vb.Dispose();
return(_vbs[key]);
}
}
return(vb);
}
public IndexBufferAndCount GetIndexBufferAndCount(MeshData mesh)
{
int indexCount;
IndexBufferAndCount bufferAndCount;
BufferKey key = new BufferKey(mesh);
if (!_ibs.TryGetValue(key, out bufferAndCount))
{
var indexBuffer = mesh.CreateIndexBuffer(_factory, out indexCount);
bufferAndCount = new IndexBufferAndCount(indexBuffer, indexCount);
if (!_ibs.TryAdd(key, bufferAndCount))
{
indexBuffer.Dispose();
return(_ibs[key]);
}
}
else
{
indexCount = bufferAndCount.IndexCount;
}
return(bufferAndCount);
}