* ``default_outer_level`` is the default value for the outer tessellation
levels. This corresponds to GL's ``PATCH_DEFAULT_OUTER_LEVEL``.
* ``default_inner_level`` is the default value for the inner tessellation
levels. This corresponds to GL's ``PATCH_DEFAULT_INNER_LEVEL``.
* ``default_outer_level`` is the default value for the outer tessellation
levels. This corresponds to GL's ``PATCH_DEFAULT_OUTER_LEVEL``.
* ``default_inner_level`` is the default value for the inner tessellation
levels. This corresponds to GL's ``PATCH_DEFAULT_INNER_LEVEL``.