gl_PatchVerticesIn - OpenGL ES 3.2 Reference Pages

## Name

gl_PatchVerticesIn — contains the number of vertices in the current patch

## Declaration

`in highp int gl_PatchVerticesIn ;`

## Description

Available only in the tessellation control and evaluation languages, `gl_PatchVerticesIn` contains the number of vertices in the input being processed by the shader. A single tessellation control or evaluation shader can read patches of differing sizes, and so the value of `gl_PatchVerticesIn` may differ between patches.

## Version Support

| OpenGL ES Shading Language Version
--- | ---
Variable Name | 1.00 | 3.00 | 3.10 | 3.20
gl_PatchVerticesIn | - | - | - | ✔

## See Also

gl_TessLevelOuter, gl_TessLevelInner, gl_TessCoord

## Copyright

Copyright © 2011-2015 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/.