public T[] VerticesExtractChannel <T>(VertexElementSemantic semantic) where T : unmanaged
{
var vertexStructure = VertexStructure.Value;
if (vertexStructure != null)
{
vertexStructure.GetInfo(out var vertexSize, out _);
var vertices = Vertices.Value;
if (vertices != null)
{
var vertexCount = vertices.Length / vertexSize;
if (vertexStructure.GetElementBySemantic(semantic, out var element))
{
unsafe
{
if (VertexElement.GetSizeInBytes(element.Type) == sizeof(T))
{
T[] result = new T[vertexCount];
fixed(byte *pVertices = vertices)
{
byte *src = pVertices + element.Offset;
for (int n = 0; n < vertexCount; n++)
{
result[n] = *(T *)src;
src += vertexSize;
}
}
return(result);
}
}
}
}
}
return(null);
}
//!!!!IList<> ?
public static bool GetElementBySemantic(this VertexElement[] elements, VertexElementSemantic semantic, out VertexElement element)
{
//!!!!slowly
for (int n = 0; n < elements.Length; n++)
{
if (elements[n].Semantic == semantic)
{
element = elements[n];
return(true);
}
}
element = new VertexElement();
return(false);
}