OptionalstencilComparison method; defaults to Always.
OptionalstencilBitmask used for comparison; defaults to 0xffffffff.
OptionalstencilWhether to write only stencil, not color; defaults to false.
OptionalstencilReference value for comparison and replacement; defaults to 0.
OptionalstencilUpdate operation; defaults to Keep.
Initial stencil test settings; omitted fields use StencilMode defaults.