These pieces of state are too small, variable, and/or trivial to have CSO
objects. They all follow simple, one-method binding calls, e.g.
-``set_edgeflags``.
-
+``set_blend_color``.
+* ``set_stencil_ref`` sets the stencil front and back reference values
+ which are used as comparison values in stencil test.
* ``set_blend_color``
* ``set_clip_state``
* ``set_polygon_stipple``