---
name: "glClearIndex"
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/glClearIndex"
---

# glClearIndex(3x)

specify the clear value for the color index buffers

## NAME

**glClearIndex** - specify the clear value for the color index buffers

## C SPECIFICATION

void **glClearIndex**( GLfloat *c* )

```

```

delim $$

## PARAMETERS

- *c*

  Specifies the index used when the color index buffers are cleared. The initial value is 0.

## DESCRIPTION

**glClearIndex** specifies the index used by **glClear** to clear the color index buffers. *c* is not clamped. Rather, *c* is converted to a fixed-point value with unspecified precision to the right of the binary point. The integer part of this value is then masked with $2 sup m^-^1$, where $m$ is the number of bits in a color index stored in the frame buffer.

## ERRORS

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

## ASSOCIATED GETS

**glGet** with argument **GL\_INDEX\_CLEAR\_VALUE**\
 **glGet** with argument **GL\_INDEX\_BITS**

## SEE ALSO

**glClear(3G)**