/*
-----------------------------------------------------------------------------
This source file is part of OGRE
    (Object-oriented Graphics Rendering Engine)
For the latest info, see http://www.ogre3d.org/

Copyright (c) 2000-2005 The OGRE Team
Also see acknowledgements in Readme.html

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.
-----------------------------------------------------------------------------
*/
#include "OgreStableHeaders.h"
#include "OgreHighLevelGpuProgramManager.h"

namespace Ogre {

	//-----------------------------------------------------------------------
	template<> HighLevelGpuProgramManager* 
	Singleton<HighLevelGpuProgramManager>::ms_Singleton = 0;
    HighLevelGpuProgramManager* HighLevelGpuProgramManager::getSingletonPtr(void)
    {
        return ms_Singleton;
    }
    HighLevelGpuProgramManager& HighLevelGpuProgramManager::getSingleton(void)
    {  
        assert( ms_Singleton );  return ( *ms_Singleton );  
    }
	//-----------------------------------------------------------------------
	HighLevelGpuProgramManager::HighLevelGpuProgramManager()
	{
        // Loading order
        mLoadOrder = 50.0f;
        // Resource type
        mResourceType = "HighLevelGpuProgram";

        ResourceGroupManager::getSingleton()._registerResourceManager(mResourceType, this);    
       
	}
	//-----------------------------------------------------------------------
	HighLevelGpuProgramManager::~HighLevelGpuProgramManager()
	{
        ResourceGroupManager::getSingleton()._unregisterResourceManager(mResourceType);    
	}
    //---------------------------------------------------------------------------
	void HighLevelGpuProgramManager::addFactory(HighLevelGpuProgramFactory* factory)
	{
		// deliberately allow later plugins to override earlier ones
		mFactories[factory->getLanguage()] = factory;
	}
    //---------------------------------------------------------------------------
	HighLevelGpuProgramFactory* HighLevelGpuProgramManager::getFactory(const String& language)
	{
		FactoryMap::iterator i = mFactories.find(language);

		if (i == mFactories.end())
		{
			OGRE_EXCEPT(Exception::ERR_ITEM_NOT_FOUND, 
				"Cannot find factory for language '" + language + "'",
				"HighLevelGpuProgramManager::getFactory");
		}
		return i->second;
	}
    //---------------------------------------------------------------------------
    Resource* HighLevelGpuProgramManager::createImpl(const String& name, ResourceHandle handle, 
        const String& group, bool isManual, ManualResourceLoader* loader,
        const NameValuePairList* params)
    {
        NameValuePairList::const_iterator paramIt;

        if (!params || (paramIt = params->find("language")) == params->end())
        {
            OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, 
                "You must supply a 'language' parameter",
                "HighLevelGpuProgramManager::createImpl");
        }

        return getFactory(paramIt->second)->create(this, name, getNextHandle(), 
            group, isManual, loader);
    }
    //---------------------------------------------------------------------------
    HighLevelGpuProgramPtr HighLevelGpuProgramManager::createProgram(
			const String& name, const String& groupName, 
            const String& language, GpuProgramType gptype)
    {
        ResourcePtr ret = ResourcePtr(
            getFactory(language)->create(this, name, getNextHandle(), 
            groupName, false, 0));

        HighLevelGpuProgramPtr prg = ret;
        prg->setType(gptype);
        prg->setSyntaxCode(language);

        addImpl(ret);
        // Tell resource group manager
        ResourceGroupManager::getSingleton()._notifyResourceCreated(ret);
        return prg;
    }
    //---------------------------------------------------------------------------
    HighLevelGpuProgramFactory::~HighLevelGpuProgramFactory() 
    {
    }
}