Pipeline depth/stencil state (used by [RenderingDevice]). [RDPipelineDepthStencilState] controls the way depth and stencil comparisons are performed when sampling those values using [RenderingDevice]. If [code]true[/code], enables depth testing which allows objects to be automatically occluded by other objects based on their depth. This also allows objects to be partially occluded by other objects. If [code]false[/code], objects will appear in the order they were drawn (like in Godot's 2D renderer).