private (PrimitiveTopology, IEnumerable <int>) TransformPrimitive(MeshPrimitive primitive)
{
switch (primitive.DrawPrimitiveType)
{
case PrimitiveType.TRIANGLES:
return(PrimitiveTopology.TriangleList,
primitive.GetTriangleIndices().SelectMany(_ => new[] { _.Item1, _.Item2, _.Item3 }));
case PrimitiveType.TRIANGLE_STRIP:
return(PrimitiveTopology.TriangleList,
primitive.GetTriangleIndices().SelectMany(_ => new[] { _.Item1, _.Item2, _.Item3 }));
case PrimitiveType.TRIANGLE_FAN:
return(PrimitiveTopology.TriangleList,
primitive.GetTriangleIndices().SelectMany(_ => new[] { _.Item1, _.Item2, _.Item3 }));
case PrimitiveType.POINTS:
return(PrimitiveTopology.PointList, primitive.GetPointIndices());
case PrimitiveType.LINES:
return(PrimitiveTopology.LineList,
primitive.GetLineIndices().SelectMany(_ => new[] { _.Item1, _.Item2 }));
case PrimitiveType.LINE_STRIP:
return(PrimitiveTopology.LineList,
primitive.GetLineIndices().SelectMany(_ => new[] { _.Item1, _.Item2 }));
case PrimitiveType.LINE_LOOP:
return(PrimitiveTopology.LineList,
primitive.GetLineIndices().SelectMany(_ => new[] { _.Item1, _.Item2 }));
default:
throw new ArgumentOutOfRangeException();
}
}