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);
}
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 MemoryAccessInfo[] GetVertexAttributes(this IVertexBuilder firstVertex, int vertexCount, PackedEncoding vertexEncoding)
{
var tvg = firstVertex.GetGeometry().GetType();
var tvm = firstVertex.GetMaterial().GetType();
var tvs = firstVertex.GetSkinning().GetType();
var attributes = new List <MemoryAccessInfo>();
foreach (var finfo in tvg.GetFields())
{
var attribute = _GetMemoryAccessInfo(finfo);
if (attribute.HasValue)
{
attributes.Add(attribute.Value);
}
}
foreach (var finfo in tvm.GetFields())
{
var attribute = _GetMemoryAccessInfo(finfo);
if (attribute.HasValue)
{
var a = attribute.Value;
if (a.Name.StartsWith("COLOR_", StringComparison.OrdinalIgnoreCase))
{
if (vertexEncoding.ColorEncoding.HasValue)
{
a.Encoding = vertexEncoding.ColorEncoding.Value;
a.Normalized = a.Encoding != ENCODING.FLOAT;
}
}
attributes.Add(a);
}
}
foreach (var finfo in tvs.GetFields())
{
var attribute = _GetMemoryAccessInfo(finfo);
if (attribute.HasValue)
{
var a = attribute.Value;
if (a.Name.StartsWith("JOINTS_", StringComparison.OrdinalIgnoreCase))
{
a.Encoding = vertexEncoding.JointsEncoding.Value;
}
if (a.Name.StartsWith("WEIGHTS_", StringComparison.OrdinalIgnoreCase))
{
a.Encoding = vertexEncoding.WeightsEncoding.Value;
if (a.Encoding != ENCODING.FLOAT)
{
a.Normalized = true;
}
}
attributes.Add(a);
}
}
var array = attributes.ToArray();
MemoryAccessInfo.SetInterleavedInfo(array, 0, vertexCount);
return(array);
}
