public static MemoryAccessor[] CreateVertexMemoryAccessors <TVertex>(this IReadOnlyList <TVertex> vertices, PackedEncoding vertexEncoding)
where TVertex : IVertexBuilder
{
if (vertices == null || vertices.Count == 0)
{
return(null);
}
vertexEncoding.AdjustJointEncoding(vertices);
// determine the vertex attributes from the first vertex.
var attributes = GetVertexAttributes(vertices[0], vertices.Count, vertexEncoding);
// create a buffer
int byteStride = attributes[0].ByteStride;
var vbuffer = new ArraySegment <byte>(new Byte[byteStride * vertices.Count]);
// fill the buffer with the vertex attributes.
var accessors = MemoryAccessInfo
.Slice(attributes, 0, vertices.Count)
.Select(item => new MemoryAccessor(vbuffer, item))
.ToArray();
foreach (var accessor in accessors)
{
accessor.FillAccessor(vertices);
}
MemoryAccessor.SanitizeVertexAttributes(accessors);
return(accessors);
}
public static MemoryAccessor CreateVertexMemoryAccessor <TVertex>(this IReadOnlyList <TVertex> vertices, string attributeName, PackedEncoding vertexEncoding)
where TVertex : IVertexBuilder
{
if (vertices == null || vertices.Count == 0)
{
return(null);
}
vertexEncoding.AdjustJointEncoding(vertices);
// determine the vertex attributes from the first vertex.
var attributes = GetVertexAttributes(vertices[0], vertices.Count, vertexEncoding);
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.StepByteLength * vertices.Count]);
// fill the buffer with the vertex attributes.
var accessor = new MemoryAccessor(vbuffer, attribute);
accessor.FillAccessor(vertices);
return(accessor);
}