Light | Dark

# docs.GL

OpenGL 3
OpenGL 2

# glClearIndex

## Name

glClearIndex — specify the clear value for the color index buffers

## C Specification

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

## 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

## Copyright

Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see https://web.archive.org/web/20171022161616/http://oss.sgi.com/projects/FreeB/.

Think you can improve this page? Edit this page on GitHub.