setStencilReference method
The value the stencil test compares against and StencilOperation.setToReferenceValue stores. Eight bits; zero until set.
A wider value keeps its low eight bits and loses the rest, on every backend, through StencilState.narrowReference — see it for why the three would otherwise each answer differently.
Implementation
@override
void setStencilReference(int value) {
stencilReference = value;
commands.add(RecordedStencilReference(value));
}