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

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 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 General Public License for more details.

You should have received a copy of the GNU 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/gpl.html.
-----------------------------------------------------------------------------
*/

#include "OgreGLGpuProgramManager.h"
#include "OgreGLGpuProgram.h"
#include "OgreLogManager.h"

using namespace Ogre;

GLGpuProgramManager::GLGpuProgramManager()
{
    // Superclass sets up members 

    // Register with resource group manager
    ResourceGroupManager::getSingleton()._registerResourceManager(mResourceType, this);
}


GLGpuProgramManager::~GLGpuProgramManager()
{
    // Unregister with resource group manager
    ResourceGroupManager::getSingleton()._unregisterResourceManager(mResourceType);
}

bool GLGpuProgramManager::registerProgramFactory(const String& syntaxCode, CreateGpuProgramCallback createFn)
{
    return mProgramMap.insert(ProgramMap::value_type(syntaxCode, createFn)).second;
}

bool GLGpuProgramManager::unregisterProgramFactory(const String& syntaxCode)
{
    return mProgramMap.erase(syntaxCode) != 0;
}

GpuProgramParametersSharedPtr GLGpuProgramManager::createParameters(void)
{ 
    return GpuProgramParametersSharedPtr(new GpuProgramParameters());
}

/// @copydoc ResourceManager::createImpl
Resource* GLGpuProgramManager::createImpl(const String& name, ResourceHandle handle, 
                     const String& group, bool isManual, ManualResourceLoader* loader,
                     const NameValuePairList* params)
{
    NameValuePairList::const_iterator paramSyntax, paramType;

    if (!params || (paramSyntax = params->find("syntax")) == params->end() ||
        (paramType = params->find("type")) == params->end())
    {
        OGRE_EXCEPT(Exception::ERR_INVALIDPARAMS, 
            "You must supply 'syntax' and 'type' parameters",
            "GLGpuProgramManager::createImpl");
    }

    ProgramMap::const_iterator iter = mProgramMap.find(paramSyntax->second);
    if(iter == mProgramMap.end())
    {
        // No factory, this is an unsupported syntax code, probably for another rendersystem
        // Create a basic one, it doesn't matter what it is since it won't be used
        return new GLGpuProgram(this, name, handle, group, isManual, loader);
    }

    GpuProgramType gpt;
    if (paramType->second == "vertex_program")
    {
        gpt = GPT_VERTEX_PROGRAM;
    }
    else
    {
        gpt = GPT_FRAGMENT_PROGRAM;
    }

    return (iter->second)(this, name, handle, group, isManual, loader, gpt, paramSyntax->second);

}

Resource* GLGpuProgramManager::createImpl(const String& name, ResourceHandle handle, 
                     const String& group, bool isManual, ManualResourceLoader* loader,
                     GpuProgramType gptype, const String& syntaxCode)
{
    ProgramMap::const_iterator iter = mProgramMap.find(syntaxCode);
    if(iter == mProgramMap.end())
    {
        // No factory, this is an unsupported syntax code, probably for another rendersystem
        // Create a basic one, it doesn't matter what it is since it won't be used
        return new GLGpuProgram(this, name, handle, group, isManual, loader);
    }
    
    return (iter->second)(this, name, handle, group, isManual, loader, gptype, syntaxCode);
}