glIndex man page on DigitalUNIX

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glIndex(3G)							   glIndex(3G)

       glIndex,	 glIndexd, glIndexf, glIndexi, glIndexs, glIndexub, glIndexdv,
       glIndexfv, glIndexiv, glIndexsv, glIndexubv -  set  the	current	 color

       void glIndexd(
	       GLdouble c ); void glIndexf(
	       GLfloat c ); void glIndexi(
	       GLint c ); void glIndexs(
	       GLshort c ); void glIndexub(
	       GLubyte c );

       Specifies the new value for the current color index.

       void glIndexdv(
	       const GLdouble *c ); void glIndexfv(
	       const GLfloat *c ); void glIndexiv(
	       const GLint *c ); void glIndexsv(
	       const GLshort *c ); void glIndexubv(
	       const GLubyte *c );

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

       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 . 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.

       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

       glGet() with argument GL_CURRENT_INDEX

       glColor(3)(), glIndexPointer(3)


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