/*
--------------------------------------------------------------------------------
This source file is part of SkyX.
Visit ---

Copyright (C) 2009 Xavier Verguín González <xavierverguin@hotmail.com>
                                           <xavyiy@gmail.com>

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
this 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 _SkyX_GPUManager_H_
#define _SkyX_GPUManager_H_

#include "SkyxPrerequisites.h"

namespace SkyX
{

	/*!
	*/
  class SkyXDllExport GPUManager 
	{
	public:
		/*!
		Gpu program enum
		*/
		enum GpuProgram
		{
			GPUP_VERTEX   = 0,  //!< Vertex program
			GPUP_FRAGMENT = 1   //!< Fragment program
		};
	protected:
	private:
		std::vector<Ogre::Pass*> mGroundPasses; //!< Ground pass vector
		SkyX *mSkyX;                            //!< SkyX parent pointer

	public:
    /*!
		Constructor
		@param s Parent SkyX pointer
		*/
		GPUManager(SkyX* s);

		/*!
		Destructor 
		*/
		~GPUManager();

		/*!
		Add ground pass (Use for atmospheric scattering effect on the terrain)
		@param GroundPass Ground pass
		@param AtmosphereRaidus Atmosphere radius (far carmera clip plane, or needed)
		@param SBT Scene blend type
		*/
		void addGroundPass(Ogre::Pass* GroundPass, const Ogre::Real& AtmosphereRadius = 0, const Ogre::SceneBlendType& SBT = Ogre::SBT_ADD);

		/*!
		Set gpu program int parameter
		@param GpuP Gpu program type (Vertex/Fragment)
		@param Name param name
		@param Value value
		@param UpdateGroundPasses true to update ground passes
		*/
		void setGpuProgramParameter(const GpuProgram &GpuP, const Ogre::String &Name, const int &Value, const bool& UpdateGroundPasses = true);

		/*!
		Set gpu program Ogre::Real parameter
		@param GpuP Gpu program type (Vertex/Fragment)
		@param Name param name
		@param Value value
		@param UpdateGroundPasses true to update ground passes
		*/
		void setGpuProgramParameter(const GpuProgram &GpuP, const Ogre::String &Name, const Ogre::Real &Value, const bool& UpdateGroundPasses = true);

		/*!
		Set gpu program Ogre::Vector2 parameter
		@param GpuP Gpu program type (Vertex/Fragment)
		@param Name param name
		@param Value value
		@param UpdateGroundPasses true to update ground passes
		*/
		void setGpuProgramParameter(const GpuProgram &GpuP, const Ogre::String &Name, const Ogre::Vector2 &Value, const bool& UpdateGroundPasses = true); 

		/*!
		Set gpu program Ogre::Vector3 parameter
		@param GpuP Gpu program type (Vertex/Fragment)
		@param Name param name
		@param Value value
		@param UpdateGroundPasses true to update ground passes
		 */
		void setGpuProgramParameter(const GpuProgram &GpuP, const Ogre::String &Name, const Ogre::Vector3 &Value, const bool& UpdateGroundPasses = true); 
	
		/*!
		Update fragment program materials
		@remarks Only for internal use
		*/
		void _updateFP();

		/*!
		Get skydome material name
		@return Skydome material name
		*/
		const Ogre::String getSkydomeMaterialName() const;

		/*!
		Get moon material name
		@return Moon material name
		*/
		inline const Ogre::String getMoonMaterialName() const
		{
			return "SkyX_Moon";
		}
	protected:
	private:
	};

}

#endif