glPopName man page on DigitalUNIX

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glPopName(3G)							 glPopName(3G)

       glPopName, glPushName - push and pop the name stack

       void glPopName(
	       void );

       Specifies a name that will be pushed onto the name stack.

       The name stack is used during selection mode to allow sets of rendering
       commands to be uniquely identified. It consists of an  ordered  set  of
       unsigned integers and is initially empty.

       glPushName() causes name to be pushed onto the name stack.  glPopName()
       pops one name off the top of the stack.

       The  maximum  name  stack  depth	 is   implementation-dependent;	  call
       GL_MAX_NAME_STACK_DEPTH	to  find out the value for a particular imple‐
       mentation.  It is an error to push a name onto a full stack, or to  pop
       a  name	off an empty stack. It is also an error to manipulate the name
       stack between the execution of glBegin() and the	 corresponding	execu‐
       tion  of glEnd(). In any of these cases, the error option is set and no
       other change is made to GL state.

       The name stack is always empty while the render mode is not  GL_SELECT.
       Calls  to  glPushName()	or  glPopName()	 while	the render mode is not
       GL_SELECT are ignored.

       GL_STACK_OVERFLOW is generated if glPushName() is called while the name
       stack is full.

       GL_STACK_UNDERFLOW is generated if glPopName() is called while the name
       stack is empty.

       GL_INVALID_OPERATION is generated if  glPushName()  or  glPopName()  is
       executed	 between  a  call  to  glBegin() and the corresponding call to

       glGet() with argument GL_NAME_STACK_DEPTH
       glGet() with argument GL_MAX_NAME_STACK_DEPTH

       glInitNames(3), glLoadName(3), glRenderMode(3), glSelectBuffer(3)


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