OpenGL Programming Guide

Appendix EThe OpenGL Programming Guide Auxiliary Library

Loading the Color Map

If you're using color-index mode, you might be surprised to discover there's no OpenGL routine to load a color into a color lookup table. This is because the process of loading a color map depends entirely on the window system. The auxiliary library provides a generalized routine to load a single color index with an RGB value, auxSetOneColor(). You need to implement this routine for your particular system. void auxSetOneColor(GLint index, GLfloat red, GLfloat green, GLfloat blue);

Loads the index in the color map, index, with the given red, green, and blue values. These values are normalized to lie in the range [0.0,1.0].

OpenGL Programming Guide