interface GPUStencilFaceState
optional
compare: GPUCompareFunctionoptional
failOp: GPUStencilOperationoptional
depthFailOp: GPUStencilOperationoptional
passOp: GPUStencilOperationcompare: GPUCompareFunctionfailOp: GPUStencilOperationdepthFailOp: GPUStencilOperationpassOp: GPUStencilOperation