2011 Khronos Group
gl_TessCoord 3G
gl_TessCoord contains the coordinate of the vertex within the current patch

## Declaration

`in vec3 gl_TessCoord;`

## Description

Available only in the tessellation cevaluation language, `gl_TessCoord` specifies the three component (u, v, w) vector identifying the position of the vertex being processed by the shader relative to the primitive being tessellated.

## 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_TessCoord | - | - | - | - | - | - | Y | Y

## See Also

gl_TessLevelOuter, gl_TessLevelInner, gl_PatchVerticesIn

## 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/.