/*
 *
 *  Copyright (C) 2000 Silicon Graphics, Inc.  All Rights Reserved. 
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  Further, this software is distributed without any warranty that it is
 *  free of the rightful claim of any third person regarding infringement
 *  or the like.  Any license provided herein, whether implied or
 *  otherwise, applies only to this software file.  Patent licenses, if
 *  any, provided herein do not apply to combinations of this program with
 *  other software, or any other product whatsoever.
 * 
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 *  Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 *  Mountain View, CA  94043, or:
 * 
 *  http://www.sgi.com 
 * 
 *  For further information regarding this notice, see: 
 * 
 *  http://oss.sgi.com/projects/GenInfo/NoticeExplan/
 *
 */

//  -*- C++ -*-

/*
 * Copyright (C) 1990,91   Silicon Graphics, Inc.
 *
 _______________________________________________________________________
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 |
 |   $Revision: 1.1.1.1 $
 |
 |   Description:
 |	This file defines the SoGLShapeHintsElement class.
 |
 |   Author(s)		: Paul S. Strauss
 |
 ______________  S I L I C O N   G R A P H I C S   I N C .  ____________
 _______________________________________________________________________
 */

#ifndef  _SO_GL_SHAPE_HINTS_ELEMENT
#define  _SO_GL_SHAPE_HINTS_ELEMENT

#include <Inventor/elements/SoShapeHintsElement.h>

//////////////////////////////////////////////////////////////////////////////
//
//  Class: SoGLShapeHintsElement
//
//  Element that stores current shape hints and sends commands to GL
//  based on them. All three hints must be set at the same time; to
//  leave any hint as is, use the "AS_IS" enum value.
//
//////////////////////////////////////////////////////////////////////////////

SoEXTENDER class SoGLShapeHintsElement : public SoShapeHintsElement {

    SO_ELEMENT_HEADER(SoGLShapeHintsElement);

  public:
    // Initializes element
    virtual void	init(SoState *state);

    // Override push() method to remember previous element's state so
    // we can sometimes generate more efficient GL calls
    virtual void	push(SoState *state);

    // Override pop() method so side effects can occur in GL
    virtual void	pop(SoState *state, const SoElement *prevTopElement);

  SoINTERNAL public:
    // Initializes the SoGLShapeHintsElement class
    static void		initClass();

  protected:
    // Override virtual sets to have GL side effects
    virtual void	setElt(VertexOrdering vertexOrdering,
			       ShapeType shapeType, FaceType faceType);

    virtual ~SoGLShapeHintsElement();

  private:
    // We save the state to figure out if the hints were
    // copied from a parent element; if they were, then caches will have
    // to depend on that element because if it changes we have to have
    // a chance to change our decision about what GL calls to make.
    // If this is NULL, then there are no cache dependencies.
    SoState *		copiedFromParent;

    // Sends shape hints in element to GL
    void		send();
};

#endif /* _SO_GL_SHAPE_HINTS_ELEMENT */
