Flags to indicate specialized native subpass behaviour.
| None | Default flags. |
| ReadOnlyDepth | The depth attachment is read-only in this sub pass. Some renderers require this in order to be able to use the depth attachment as input. |
| ReadOnlyStencil | Both depth and stencil attachments are read-only in this sub pass. Some renderers require this in order to be able to use the depth and stencil attachments as inputs. |
| ReadOnlyDepthStencil | The stencil attachment is read-only in this sub pass. Some renderers require this in order to be able to use the stencil attachment as input. |