Contains the inner tessellation levels for the current patch.
Available only in the tessellation control and evaluation languages,gl_TessLevelInneris used to assign values to the corresponding inner tesellation levels of the current patch. The values written intogl_TessLevelInnerby the tessellation control shader are used by the tessellation primitive generator to control primitive tessellation and may be read by the subsequent tessellation evaluation shader.
As inputs to the tessellation evaluation shader,gl_TessLevelInnercontains the values written by the tessellation control shader, if present. If no tessellation control shader is present, it contains the default tessellation level.
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