/*
This source file is part of Castor3D (http://castor3d.developpez.com/castor3d.htm)

This program 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 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with
the program; if not, write to the Free Software Foundation, Inc., 59 Temple
Place - Suite 330, Boston, MA 02111-1307, USA, or go to
http://www.gnu.org/copyleft/lesser.txt.
*/
#ifndef ___Gl_ShaderObject___
#define ___Gl_ShaderObject___

#include "Module_GlRender.hpp"

#include <Castor3D/ShaderObject.hpp>

namespace GlRender
{
	class GlShaderObject : public Castor3D::ShaderObjectBase, CuNonCopyable
	{
		friend class GlShaderProgram;
		typedef std::map< Castor::String, uint32_t > UIntStrMap;

	protected:
		uint32_t			m_shaderObject;				//!< Shader Object
		Castor::String		m_compilerLog;
		GlShaderProgram *	m_pShaderProgram;
		UIntStrMap			m_mapParamsByName;
		OpenGl &			m_gl;

	public:
		/**
		 * Constructor
		 */
		GlShaderObject( OpenGl & p_gl, GlShaderProgram * p_pParent, Castor3D::eSHADER_TYPE p_eType);
		/**
		 * Destructor
		 */
		virtual ~GlShaderObject();
		/**
		 * Creates the GL Shader program
		 */
		virtual void CreateProgram();
		/**
		 * Compiles program
		 */
		virtual bool Compile();
		/**
		 * Compiles program
		 */
		inline void Bind() {}
		/**
		 * Compiles program
		 */
		inline void Unbind() {}
		/**
		 * Get compiler messages
		 */
		void RetrieveCompilerLog( Castor::String & p_strCompilerLog);
		/**
		 * Detaches this shader from it's program
		 */
		void Detach();
		/**
		 * Attaches this shader to the given program
		 */
		void AttachTo( GlShaderProgram * p_pProgram);
		/**
		 * Destroys the GL Shader Program
		 */
		virtual void DestroyProgram();

		virtual void SetEntryPoint( Castor::String const & CU_PARAM_UNUSED( p_strName ) )	{}
		virtual Castor::String	GetEntryPoint	()const	{ return cuT( "" ); }
		/**
		 *\~english
		 *\brief		Tells if the compiled shader has the given parameter
		 *\param[in]	p_strName	The parameter name
		 *\return		\p true if the parameter was found
		 *\~french
		 *\brief		Dit si le shader compilé a le paramètre donné
		 *\param[in]	p_strName	Le nom du paramètre
		 *\return		\p true si le paramètre a été trouvé
		 */
		virtual bool HasParameter( Castor::String const & p_strName );
		/**
		 *\~english
		 *\brief		Gives the wanted parameter from compiled shader
		 *\param[in]	p_strName	The parameter name
		 *\return		\p NULL if not found or if shader isn't compiled
		 *\~french
		 *\brief		Récupère le paramètre à partir du shader compilé
		 *\param[in]	p_strName	Le nom du paramètre
		 *\return		\p NULL si le paramètre n'a pas été trouvé ou si le shader n'est pas compilé
		 */
		uint32_t GetParameter( Castor::String const & p_strName );
		/**
		 *\~english
		 *\brief		Defines the given parameter value
		 *\param[in]	p_strName	The parameter name
		 *\param[in]	p_mtxValue	The parameter value
		 *\~french
		 *\brief		Définit la valeur du paramètre
		 *\param[in]	p_strName	Le nom du paramètre
		 *\param[in]	p_mtxValue	La valeur du paramètre
		 */
		virtual void SetParameter( Castor::String const & p_strName, Castor::Matrix4x4r const & p_mtxValue );
		/**
		 *\~english
		 *\brief		Defines the given parameter value
		 *\param[in]	p_strName	The parameter name
		 *\param[in]	p_mtxValue	The parameter value
		 *\~french
		 *\brief		Définit la valeur du paramètre
		 *\param[in]	p_strName	Le nom du paramètre
		 *\param[in]	p_mtxValue	La valeur du paramètre
		 */
		virtual void SetParameter( Castor::String const & p_strName, Castor::Matrix3x3r const & p_mtxValue );
	};
}

#endif