---
name: "glStencilMask"
section: "3x"
platform: "linux"
package: "xlibmesa-gl-dev"
version: "4.3.0.dfsg.1-14sarge7"
release: "Debian 3.1 (Sarge)"
platforms: ["linux"]
url: "https://new.carta.tech/glStencilMask"
---

# glStencilMask(3x)

control the writing of individual bits in the stencil planes

## NAME

**glStencilMask** - control the writing of individual bits in the stencil planes

## C SPECIFICATION

void **glStencilMask**( GLuint *mask* )

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## PARAMETERS

- *mask*

  Specifies a bit mask to enable and disable writing of individual bits in the stencil planes. Initially, the mask is all 1's.

## DESCRIPTION

**glStencilMask** controls the writing of individual bits in the stencil planes. The least significant $n$ bits of *mask*, where $n$ is the number of bits in the stencil buffer, specify a mask. Where a 1 appears in the mask, it's possible to write to the corresponding bit in the stencil buffer. Where a 0 appears, the corresponding bit is write-protected. Initially, all bits are enabled for writing.

## ERRORS

**GL\_INVALID\_OPERATION** is generated if **glStencilMask** is executed between the execution of **glBegin** and the corresponding execution of **glEnd**.

## ASSOCIATED GETS

**glGet** with argument **GL\_STENCIL\_WRITEMASK**\
 **glGet** with argument **GL\_STENCIL\_BITS**

## SEE ALSO

**glColorMask(3G)**, **glDepthMask(3G)**, **glIndexMask(3G)**, **glStencilFunc(3G)**, **glStencilOp(3G)**