NAME
	  glRenderMode - set rasterization mode


     C SPECIFICATION
	  GLint	glRenderMode( GLenum mode )


     PARAMETERS
	  mode	Specifies the rasterization mode.  Three values	are
		accepted:  GL_RENDER, GL_SELECT, and GL_FEEDBACK.  The
		initial	value is GL_RENDER.

     DESCRIPTION
	  glRenderMode sets the	rasterization mode.  It	takes one
	  argument, mode, which	can assume one of three	predefined
	  values:

	  GL_RENDER	  Render mode. Primitives are rasterized,
			  producing pixel fragments, which are written
			  into the frame buffer.  This is the normal
			  mode and also	the default mode.

	  GL_SELECT	  Selection mode.  No pixel fragments are
			  produced, and	no change to the frame buffer
			  contents is made.  Instead, a	record of the
			  names	of primitives that would have been
			  drawn	if the render mode had been GL_RENDER
			  is returned in a select buffer, which	must
			  be created (see glSelectBuffer) before
			  selection mode is entered.

	  GL_FEEDBACK	  Feedback mode.  No pixel fragments are
			  produced, and	no change to the frame buffer
			  contents is made.  Instead, the coordinates
			  and attributes of vertices that would	have
			  been drawn if	the render mode	had been
			  GL_RENDER is returned	in a feedback buffer,
			  which	must be	created	(see glFeedbackBuffer)
			  before feedback mode is entered.

	  The return value of glRenderMode is determined by the	render
	  mode at the time glRenderMode	is called, rather than by
	  mode.	 The values returned for the three render modes	are as
	  follows:

	  GL_RENDER	  0.

	  GL_SELECT	  The number of	hit records transferred	to the
			  select buffer.

	  GL_FEEDBACK	  The number of	values (not vertices)
			  transferred to the feedback buffer.

	  See the glSelectBuffer and glFeedbackBuffer reference	pages
	  for more details concerning selection	and feedback
	  operation.

     NOTES
	  If an	error is generated, glRenderMode returns 0 regardless
	  of the current render	mode.

     ERRORS
	  GL_INVALID_ENUM is generated if mode is not one of the three
	  accepted values.

	  GL_INVALID_OPERATION is generated if glSelectBuffer is
	  called while the render mode is GL_SELECT, or	if
	  glRenderMode is called with argument GL_SELECT before
	  glSelectBuffer is called at least once.

	  GL_INVALID_OPERATION is generated if glFeedbackBuffer	is
	  called while the render mode is GL_FEEDBACK, or if
	  glRenderMode is called with argument GL_FEEDBACK before
	  glFeedbackBuffer is called at	least once.

	  GL_INVALID_OPERATION is generated if glRenderMode is
	  executed between the execution of glBegin and	the
	  corresponding	execution of glEnd.

     ASSOCIATED	GETS
	  glGet	with argument GL_RENDER_MODE

     SEE ALSO
	  glFeedbackBuffer, glInitNames, glLoadName, glPassThrough,
	  glPushName, glSelectBuffer