NAME
	  fglRenderMode	- set rasterization mode


     FORTRAN SPECIFICATION
	  INTEGER*4 fglRenderMode( INTEGER*4 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
	  fglRenderMode	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 fglSelectBuffer) 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
			  fglFeedbackBuffer) before feedback mode is
			  entered.

	  The return value of fglRenderMode is determined by the
	  render mode at the time fglRenderMode	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 fglSelectBuffer and fglFeedbackBuffer	reference
	  pages	for more details concerning selection and feedback
	  operation.

     NOTES
	  If an	error is generated, fglRenderMode 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 fglSelectBuffer is
	  called while the render mode is GL_SELECT, or	if
	  fglRenderMode	is called with argument	GL_SELECT before
	  fglSelectBuffer is called at least once.

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

	  GL_INVALID_OPERATION is generated if fglRenderMode is
	  executed between the execution of fglBegin and the
	  corresponding	execution of fglEnd.

     ASSOCIATED	GETS
	  fglGet with argument GL_RENDER_MODE

     SEE ALSO
	  fglFeedbackBuffer, fglInitNames, fglLoadName,
	  fglPassThrough, fglPushName, fglSelectBuffer