public static G3D ReadG3d(this Stream stream, Func <string, string> renameFunc = null)
{
var header = G3dHeader.Default;
GeometryAttribute ReadAttribute(Stream s2, string name, long size)
{
var rename = renameFunc?.Invoke(name) ?? name;
// Check for the G3dHeader
if (rename == "meta")
{
if (size == 8)
{
var buffer = s2.ReadArray <byte>((int)size);
if (buffer[0] == G3dHeader.MagicA && buffer[1] == G3dHeader.MagicB)
{
header = G3dHeader.FromBytes(buffer);
}
}
else
{
s2.ReadArray <byte>((int)size);
}
return(null);
}
else
{
// Figure out the correct type and then read it in
var desc = AttributeDescriptor.Parse(rename);
var dflt = desc.ToDefaultAttribute(0);
return(dflt.Read(stream, size));
}
}
var results = stream.ReadBFast(ReadAttribute).Select(r => r.Item2);
return(new G3D(results.Where(x => x != null), header));
}
public static int ExpectedElementCount(this IGeometryAttributes self, AttributeDescriptor desc)
{
switch (desc.Association)
{
case Association.assoc_all:
return(1);
case Association.assoc_none:
return(0);
case Association.assoc_vertex:
return(self.NumVertices);
case Association.assoc_face:
return(self.NumFaces);
case Association.assoc_corner:
return(self.NumCorners);
case Association.assoc_edge:
return(self.NumCorners);
case Association.assoc_mesh:
return(self.NumMeshes);
case Association.assoc_instance:
return(self.NumInstances);
case Association.assoc_shapevertex:
return(self.NumShapeVertices);
case Association.assoc_shape:
return(self.NumShapes);
}
return(-1);
}
/// <summary> /// Constructor. /// </summary> protected GeometryAttribute(AttributeDescriptor descriptor, int count) => (Descriptor, ElementCount) = (descriptor, count);
public bool Equals(AttributeDescriptor other) => ToString() == other.ToString();
public static GeometryAttribute ToDefaultAttribute(this AttributeDescriptor desc, int count)
{
switch (desc.DataType)
{
case DataType.dt_int8:
if (desc.DataArity == 1)
{
return(default(byte).Repeat(count).ToAttribute(desc));
}
if (desc.DataArity == 2)
{
return(default(Byte2).Repeat(count).ToAttribute(desc));
}
if (desc.DataArity == 3)
{
return(default(Byte3).Repeat(count).ToAttribute(desc));
}
if (desc.DataArity == 4)
{
return(default(Byte4).Repeat(count).ToAttribute(desc));
}
break;
case DataType.dt_int16:
if (desc.DataArity == 1)
{
return(default(short).Repeat(count).ToAttribute(desc));
}
break;
case DataType.dt_int32:
if (desc.DataArity == 1)
{
return(default(int).Repeat(count).ToAttribute(desc));
}
if (desc.DataArity == 2)
{
return(default(Int2).Repeat(count).ToAttribute(desc));
}
if (desc.DataArity == 3)
{
return(default(Int3).Repeat(count).ToAttribute(desc));
}
if (desc.DataArity == 4)
{
return(default(Int4).Repeat(count).ToAttribute(desc));
}
break;
case DataType.dt_int64:
if (desc.DataArity == 1)
{
return(default(long).Repeat(count).ToAttribute(desc));
}
break;
case DataType.dt_float32:
if (desc.DataArity == 1)
{
return(default(float).Repeat(count).ToAttribute(desc));
}
if (desc.DataArity == 2)
{
return(default(Vector2).Repeat(count).ToAttribute(desc));
}
if (desc.DataArity == 3)
{
return(default(Vector3).Repeat(count).ToAttribute(desc));
}
if (desc.DataArity == 4)
{
return(default(Vector4).Repeat(count).ToAttribute(desc));
}
if (desc.DataArity == 16)
{
return(default(Matrix4x4).Repeat(count).ToAttribute(desc));
}
break;
case DataType.dt_float64:
if (desc.DataArity == 1)
{
return(default(double).Repeat(count).ToAttribute(desc));
}
if (desc.DataArity == 2)
{
return(default(DVector2).Repeat(count).ToAttribute(desc));
}
if (desc.DataArity == 3)
{
return(default(DVector3).Repeat(count).ToAttribute(desc));
}
if (desc.DataArity == 4)
{
return(default(DVector4).Repeat(count).ToAttribute(desc));
}
break;
}
throw new Exception($"Could not create a default attribute for {desc}");
}
public static GeometryAttribute <T> ToAttribute <T>(this IArray <T> self, string desc, int index) where T : unmanaged => self.ToAttribute(AttributeDescriptor.Parse(desc).SetIndex(index));
public static GeometryAttribute <T> ToAttribute <T>(this IArray <T> self, AttributeDescriptor desc) where T : unmanaged => new GeometryAttribute <T>(self, desc);
public static GeometryAttribute <T> ToAttribute <T>(this IList <T> self, AttributeDescriptor desc) where T : unmanaged => self.ToIArray().ToAttribute(desc);
public static GeometryAttribute GetOrDefaultAttribute(this IGeometryAttributes self, AttributeDescriptor desc) => self.GetAttribute(desc.ToString()) ?? desc.ToDefaultAttribute(self.ExpectedElementCount(desc));
public static GeometryAttribute DefaultAttribute(this IGeometryAttributes self, AttributeDescriptor desc) => desc.ToDefaultAttribute(self.ExpectedElementCount(desc));
public static GeometryAttribute DefaultAttribute(this IGeometryAttributes self, string name) => self.DefaultAttribute(AttributeDescriptor.Parse(name));
public static IGeometryAttributes SetAttribute <ValueT>(this IGeometryAttributes self, IArray <ValueT> values, AttributeDescriptor desc) where ValueT : unmanaged => self.SetAttribute(values.ToAttribute(desc));
