Name

gl_TessLevelOuter — contains the outer tessellation levels for the current patch

Declaration

patch out float gl_TessLevelOuter[4]; (tessellation control language)
patch in float gl_TessLevelInner[4]; (tessellation evaluation languge)

Description

Available only in the tessellation control and evaluation languages, gl_TessLevelOuter is used to assign values to the corresponding outer tesellation levels of the current patch. The values written into gl_TessLevelOuter 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, gl_TessLevelOuter contains 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

Variable Version 1.10 Version 1.20 Version 1.30 Version 1.40 Version 1.50 Version 3.30 Version 4.00 Version 4.10
gl_TessLevelOuter - - - - - - Y Y

See Also

gl_TessLevelInner, gl_TessCoord

Copyright

Copyright © 2011 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. http://opencontent.org/openpub/.