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sglLayer.hpp

/*****************************************************************************
 * SGL: A Scene Graph Library
 *
 * Copyright (C) 1997-2001  Scott McMillan   All Rights Reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the Free
 * Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *****************************************************************************
 *     File: sglLayer.hpp
 *  Created: 5 January 2001
 *  Summary: Group that aids in rendering coplaner polygons without
 *           visual artifacts caused by the depth buffer.
 *****************************************************************************/

#ifndef __SGL_LAYER_HPP
#define __SGL_LAYER_HPP

#include <sgl.h>
#include <sglGroup.hpp>


class sglStencilLayerBegin;
class sglStencilLayerMiddle;
class sglStencilLayerEnd;
class sglDepthMask;
class sglDepthTest;
class sglColorMask;

//----------------------------------------------------------------------------

class SGL_DLL_API sglLayer : public sglGroup
{
public:
   enum LayerMethodEnum
   {
      eMULTIPASS,
      eSTENCIL
   };

public:
   sglLayer(LayerMethodEnum method = eMULTIPASS);
   virtual ~sglLayer();

   void setMethod(LayerMethodEnum method);

   LayerMethodEnum getMethod() const { return m_method; }

   void setStencilMask(GLuint mask);

   GLuint getStencilMask() { return m_stencil_mask; }

   // See sglNode::clone() for details.
   virtual sglNode *clone(unsigned int mode) const;

   // See sglObject::printInfo() for details.
   virtual void printInfo(ostream &ostrm, const char *indent_string) const;

protected:
   // See sglNode::cull(f) for details
   virtual void cull(sglCull<float> &trav_state,
                     unsigned int cull_flags) const;

   // See sglNode::cull(d) for details
   virtual void cull(sglCull<double> &trav_state,
                     unsigned int cull_flags) const;

   void copyTo(sglLayer *dst, unsigned int mode) const;

private:  // not implemented
   sglLayer(const sglLayer &);
   sglLayer &operator=(const sglLayer &);

private:
   LayerMethodEnum          m_method;
   GLuint                   m_stencil_mask;

   sglStencilLayerBegin    *m_stencil_begin;
   sglStencilLayerMiddle   *m_stencil_middle;
   sglStencilLayerEnd      *m_stencil_end;

   static sglDepthMask     *s_depth_mask;
   static sglDepthTest     *s_depth_test;
   static sglColorMask     *s_color_mask;
};

#endif

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