gl_TessLevelOuter

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

gl_TessLevelInner , gl_TessCoord

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