This layout is more flexible and polymorphic. While the worst case is worse (4 + 3 layers), the common case is more optimized (2 + 2 layers). The average written closure data is also lower since we can compact the data for special cases which are quite frequent. Some adjustment had to be made in the denoise an tile classify shaders. Pull Request: https://projects.blender.org/blender/blender/pulls/115541