public static VertexLayout ReadVertexLayout(this UnmanagedMemoryAccessor reader, ref int index)
{
var layout = new VertexLayout();
layout.Begin();
var attributeCount = reader.ReadByte(ref index);
var stride = reader.ReadUInt16(ref index);
for (int i = 0; i < attributeCount; i++)
{
var offset = reader.ReadUInt16(ref index);
var attrib = reader.ReadUInt16(ref index);
var count = reader.ReadByte(ref index);
var attribType = reader.ReadUInt16(ref index);
var normalized = reader.ReadBool(ref index);
var asInt = reader.ReadBool(ref index);
var usage = attributeUsageMap[attrib];
layout.Add(usage, count, attributeTypeMap[attribType], normalized, asInt);
if (layout.GetOffset(usage) != offset)
{
throw new InvalidOperationException("Invalid mesh data; vertex attribute offset mismatch.");
}
}
layout.End();
if (layout.Stride != stride)
{
throw new InvalidOperationException("Invalid mesh data; vertex layout stride mismatch.");
}
return(layout);
}