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Contains the outer tessellation levels for the current patch.



Available only in the tessellation control and evaluation languages,gl_TessLevelOuteris used to assign values to the corresponding outer tesellation levels of the current patch. The values written intogl_TessLevelOuterby 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_TessLevelOutercontains the values written by the tessellation control shader, if present. If no tessellation control shader is present, it contains the default tessellation level.

Version Support[edit]

gl_TessLevelOuter 4.0+

See Also[edit]

 gl_TessLevelInner , gl_TessCoord 


Copyright© 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999.