Face struct
          #include <core/gl/render_device.hpp>
        
        Decribes a stencil face.
Public variables
- Compare compare
- Stencil comparison function.
- StencilAction fail
- Stencil comparison fail action.
- StencilAction pass
- Stencil comparison pass action.
- StencilAction depthFail
- Stencil depth comparison fail action.