Texture.cpp

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/*
  Copyright (C) 2009 Jon Macey

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program 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 General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
//----------------------------------------------------------------------------------------------------------------------
//----------------------------------------------------------------------------------------------------------------------
#include "NGLassert.h"
#include "Texture.h"
#include <iostream>
#include "Util.h"

namespace ngl
{

//----------------------------------------------------------------------------------------------------------------------
Texture::Texture( const std::string &_fname  )
{
  m_image.load(_fname);
  m_width=m_image.width();
  m_height=m_image.height();
  m_channels=m_image.channels();
  m_format=m_image.format();
  m_multiTextureID=0;
}


bool Texture::loadImage( const std::string  &_fname )
{
  bool status=m_image.load(_fname);
  if(status)
  {
    m_width=m_image.width();
    m_height=m_image.height();
    m_channels=m_image.channels();
    m_format=m_image.format();
    m_multiTextureID=0;
  }
  return status;
}



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


GLuint Texture::setTextureGL() const noexcept
{
  GLuint textureName;
  glGenTextures(1,&textureName);
  glActiveTexture(GL_TEXTURE0+m_multiTextureID);
  glBindTexture(GL_TEXTURE_2D,textureName);
  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
  glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);

  glTexImage2D(GL_TEXTURE_2D,0,m_format,m_width,m_height,0,m_format,GL_UNSIGNED_BYTE,m_image.getPixels());

  std::cout<<"texture GL set "<<textureName<<" Active Texture "<<m_multiTextureID<<"\n";
  glGenerateMipmap(GL_TEXTURE_2D);
  return textureName;
}
//----------------------------------------------------------------------------------------------------------------------

void Texture::setMultiTexture( const GLint _id  ) noexcept
{
 m_multiTextureID=_id;
}



} // end namespace ngl;

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