---

sglTexEnv.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: sglTexEnv.hpp
 *  Created: 2 May 1999
 *  Summary: create, modify and query texture environment
 *****************************************************************************/

#ifndef __SGL_TEXENV_HPP
#define __SGL_TEXENV_HPP

#include <sgl.h>
#include <sglStatelet.hpp>
#include <sglVector.hpp>

class sglTexCombinerParams;

//============================================================================

class SGL_DLL_API sglTexEnv : public sglTexturingStatelet
{
public:
   enum ModeEnum
   {
      eDECAL    = GL_DECAL,

      eREPLACE  = GL_REPLACE,

      eMODULATE = GL_MODULATE,

      eADD      = GL_ADD,

      eBLEND    = GL_BLEND,

      eCOMBINE  = GL_COMBINE
   };

public:
   sglTexEnv();

   virtual ~sglTexEnv();

   void setMode(ModeEnum mode);

   ModeEnum getMode() const { return m_mode; }

   void setBlendColor(float r, float g, float b, float a);

   void getBlendColor(float &r, float &g, float &b, float &a) const;

   void setCombinerParams(sglTexCombinerParams *params);

   sglTexCombinerParams* getCombinerParams() const
      { return m_combiner_params; }

   void setLODBias(float bias);

   float getLODBias() const { return m_lod_bias; }

   // See sglTexturingStatelet::applyToUnit() for details.
   void applyToUnit(sglCurrState *curr_state, unsigned int unit) const;

   // See sglStatelet::getSorted() for details.
   virtual bool getSorted() const { return true; }

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

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

   void setIndex();

private:
   ModeEnum m_mode;
   sglVec4f m_blend_color;
   float m_lod_bias;
   sglTexCombinerParams *m_combiner_params;
};

#endif

---