1991-2006
Silicon Graphics, Inc.
glIndex
3G

# glIndex

set the current color index

## C Specification

                    void glIndexs
                    GLshort c

                    void glIndexi
                    GLint c

                    void glIndexf
                    GLfloat c

                    void glIndexd
                    GLdouble c

                    void glIndexub
                    GLubyte c

## Parameters

`c`

  Specifies the new value for the current color index.

## C Specification

                    void glIndexsv
                    const GLshort * c

                    void glIndexiv
                    const GLint * c

                    void glIndexfv
                    const GLfloat * c

                    void glIndexdv
                    const GLdouble * c

                    void glIndexubv
                    const GLubyte * c

## Parameters

`c`

  Specifies a pointer to a one-element array that contains the new value for the current color index.

## Description

`glIndex` updates the current (single-valued) color index. It takes one argument, the new value for the current color index.

The current index is stored as a floating-point value. Integer values are converted directly to floating-point values, with no special mapping. The initial value is 1.

Index values outside the representable range of the color index buffer are not clamped. However, before an index is dithered (if enabled) and written to the frame buffer, it is converted to fixed-point format. Any bits in the integer portion of the resulting fixed-point value that do not correspond to bits in the frame buffer are masked out.

## Notes

`glIndexub` and `glIndexubv` are available only if the GL version is 1.1 or greater.

The current index can be updated at any time. In particular, `glIndex` can be called between a call to glBegin and the corresponding call to glEnd.

## Associated Gets

glGet with argument `GL_CURRENT_INDEX`

## See Also

glColor, glIndexPointer

## Copyright

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