glClearIndex
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## Name

glClearIndex — specify the clear value for the color index buffers

## C Specification

`void `glClearIndex`` | `(` | `GLfloat `c`);`

## Python Specification

``glClearIndex`` | `(` | ``c`) → `None``

## 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 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

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glClearDepth | Home | glClearStencil