void GLAPIENTRY glIndexd( GLdouble c )
       void GLAPIENTRY glIndexf( GLfloat c )
       void GLAPIENTRY glIndexi( GLint c )
       void GLAPIENTRY glIndexs( GLshort c )
       void GLAPIENTRY glIndexub( GLubyte c );  /* 1.1 )

PARAMETERS
       1.1  Specifies the new value for the current color index.

C SPECIFICATION
       void GLAPIENTRY glIndexdv( const GLdouble *c )
       void GLAPIENTRY glIndexfv( const GLfloat *c )
       void GLAPIENTRY glIndexiv( const GLint *c )
       void GLAPIENTRY glIndexsv( const GLshort *c )
       void GLAPIENTRY glIndexubv( const GLubyte *c );  /* 1.1 )

PARAMETERS
       1.1    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 map‐
       ping.  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

                                                                    GLINDEX(3G)