emptyTex.cpp

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/////////////////////////////////////////////////////////////////////
// 6/13/02      Aaron Lefohn    Scientific Computing and Imaging Institute
// School of Computing          University of Utah
//
//  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.
//
//  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
////////////////////////////////////////////////////////////////////////

#include <texture/emptyTex.h>
#include <iostream>
#include <util/gliftUtil.h>

using namespace std;
using namespace gutz;

using namespace glift;

extern const GLenum g_texUnitName[NUM_TEX_UNIT_NAMES];

EmptyTex::EmptyTex()
: CoreTex( GL_TEXTURE_2D, MultiTexOState(), NULL, NULL )
{
   initMembers( 0 );
}

EmptyTex::EmptyTex( GLenum texDimenName, int texUnit )
: CoreTex( texDimenName, MultiTexOState(), NULL, NULL )
{
   initMembers( texUnit );
}

EmptyTex::EmptyTex( const EmptyTex& rhs )
: CoreTex( rhs.texType(), MultiTexOState(), NULL, NULL )
{
   initMembers( rhs );
}

EmptyTex& EmptyTex::operator=(const EmptyTex& rhs)
{
   if( &rhs != this ){

      initMembers( rhs );
   }
   return *this;
}

EmptyTex::~EmptyTex()
{}

void EmptyTex::initMembers( int texUnit )
{
#ifndef GL_ARB_multitexture
   err() << "initMembers() Error:\n"
      << "\tGL_ARB_multitexture is not defined.\n"
      << "\tEmptyTexture is not available.\n";
   exit(1);
#endif

   m_texUnit = texUnit;

   checkTexUnit( m_texUnit  );
}

void EmptyTex::checkTexUnit( GLuint texUnit )
{
   if( texUnit > (uint)getLimitsGL().maxTexUnits ) {
      err() << "checkTexUnit(...) Error:\n\t'texUnit' ( " << texUnit << " ) is "
         << "larger than glim.max_tex_units (" << getLimitsGL().maxTexUnits << ").\n";
      exit(1);
   }
}

void EmptyTex::initMembers( const EmptyTex& rhs )
{
   initMembers( rhs.m_texUnit );
}

void EmptyTex::bindDef()
{
   glActiveTexture( g_texUnitName[ m_texUnit ] );
   glEnable(texType());

   glErr(estr(),"EmptyTex:bindDef()");
}

void EmptyTex::releaseDef()
{
   glActiveTexture( g_texUnitName[ m_texUnit ] );
   glDisable(texType());
   glActiveTexture( g_texUnitName[0] );

   glErr(estr(),"EmptyTex:release()");
}

void EmptyTex::setTexData( TexData* texData, int mipLevel, bool setTexSize )
{
   err() << "setTexData(...) Error:\n"
      << "\tCall has no meaning.\n";
   exit(1);
}

void EmptyTex::resetTexState( const VecTexState& texState )
{
   err() << "resetTexState(...) Error:\n"
      << "\tCall has no meaning.\n";
   exit(1);
}

void EmptyTex::tryToBindPbuff( bool tryToUsePbuff )
{
   err() << "tryToBindPbuff(...) Error:\n"
      << "\tCall has no meaning.\n";
   exit(1);
}

void EmptyTex::copyToTex( int mipLevel, const gutz::vec3i& texOrig, 
                         const gutz::vec2i& screenOrig, const gutz::vec2i& copySize   )
{
   err() << "copyToTex(...) Error:\n"
      << "\tCall has no meaning.\n";
   exit(1);
}

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