Shader.h

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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/>.
 */
#ifndef SHADER_H_
#define SHADER_H_

#include "Types.h"

#include <iostream>
#include <cstdlib>
namespace ngl
{


// for c++ 11 use enum class at present internal only
enum  class ShaderType : char {VERTEX,FRAGMENT,GEOMETRY,TESSCONTROL,TESSEVAL,COMPUTE,NONE};
//----------------------------------------------------------------------------------------------------------------------

class NGL_DLLEXPORT Shader
{
public :
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  Shader( std::string _name,  ShaderType _type ) noexcept;
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  ~Shader();
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  void compile() noexcept;
  //----------------------------------------------------------------------------------------------------------------------
  void load( std::string _name ) noexcept;
   //----------------------------------------------------------------------------------------------------------------------
  void loadFromString(const std::string &_string  ) noexcept;
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  void toggleDebug() noexcept {m_debugState ^=true;}
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  GLuint getShaderHandle()const noexcept {return m_shaderHandle;}
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  void incrementRefCount() noexcept { ++m_refCount;}
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  void decrementRefCount() noexcept { --m_refCount;}
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  int getRefCount()const  noexcept { return m_refCount; }
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  const std::string  getShaderSource() const noexcept {return m_source;}

private :
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  std::string m_name;
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  std::string m_source;
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  bool m_compiled;
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  ShaderType m_shaderType;
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  GLuint m_shaderHandle;
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  bool m_debugState;
  //----------------------------------------------------------------------------------------------------------------------
  //----------------------------------------------------------------------------------------------------------------------
  int m_refCount;
};
} // end NGL namespace
#endif