Both depth and stencil buffers bound for rendering may be bound as samplable textures to the graphics pipeline: some platforms require the depth and stencil buffers to be set to read-only mode in such cases (D3D11, Vulkan). This flag can be used for both packed depth-stencil as well as separate depth-stencil formats. This flag is a bitwise combination of RenderTargetFlags.ReadOnlyDepth and RenderTargetFlags.ReadOnlyStencil.