public static MemoryAccessor CreateVertexMemoryAccessor <TVertex>(this IReadOnlyList <TVertex> vertices, string attributeName, Schema2.EncodingType jointEncoding)
where TVertex : IVertexBuilder
{
if (vertices == null || vertices.Count == 0)
{
return(null);
}
// determine the vertex attributes from the first vertex.
var attributes = GetVertexAttributes(vertices[0], vertices.Count, jointEncoding);
var attribute = attributes.FirstOrDefault(item => item.Name == attributeName);
if (attribute.Name == null)
{
return(null);
}
attribute.ByteOffset = 0;
attribute.ByteStride = 0;
// create a buffer
var vbuffer = new ArraySegment <byte>(new Byte[attribute.PaddedByteLength * vertices.Count]);
// fill the buffer with the vertex attributes.
var accessor = new MemoryAccessor(vbuffer, attribute);
accessor.FillAccessor(vertices);
return(accessor);
}
public static MemoryAccessor CreateVertexMemoryAccessors <TVertex>(this IReadOnlyList <TVertex> vertices, string attributeName)
where TVertex : IVertexBuilder
{
if (vertices == null || vertices.Count == 0)
{
return(null);
}
// determine the vertex attributes from the first vertex.
var attributes = GetVertexAttributes(vertices[0], vertices.Count);
var isMorphTangent = attributeName == "MORPHTANGENT";
if (isMorphTangent)
{
attributeName = "TANGENT";
}
var attribute = attributes.FirstOrDefault(item => item.Name == attributeName);
if (attribute.Name == null)
{
return(null);
}
attribute.ByteOffset = 0;
attribute.ByteStride = 0;
if (isMorphTangent)
{
attribute.Dimensions = Schema2.DimensionType.VEC3;
}
// create a buffer
var vbuffer = new ArraySegment <byte>(new Byte[attribute.PaddedByteLength * vertices.Count]);
// fill the buffer with the vertex attributes.
var accessor = new MemoryAccessor(vbuffer, attribute);
if (isMorphTangent)
{
var columnFunc = _GetVertexBuilderAttributeFunc("MORPHTANGENT");
accessor.AsVector3Array().Fill(vertices._GetColumn <TVertex, Vector3>(columnFunc));
}
else
{
accessor.FillAccessor(vertices);
}
return(accessor);
}
