> ## Documentation Index
> Fetch the complete documentation index at: https://rive.app/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# StencilOp

Operation applied to the 8-bit stencil value by a pipeline face state.
`replace` writes the reference set by `GPURenderPass:setStencilReference`.
Clamp operations saturate at 0 or 255; wrap operations wrap modulo 256.
`invert` flips every bit; `keep` leaves the value unchanged.