source: downloads/ogre/OgreMain/src/OgreHighLevelGpuProgramManager.cpp @ 48

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

Copyright (c) 2000-2006 Torus Knot Software Ltd
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.

You may alternatively use this source under the terms of a specific version of
the OGRE Unrestricted License provided you have obtained such a license from
Torus Knot Software Ltd.
-----------------------------------------------------------------------------
*/
#include "OgreStableHeaders.h"
#include "OgreHighLevelGpuProgramManager.h"
#include "OgreUnifiedHighLevelGpuProgram.h"

namespace Ogre {

        String sNullLang = "null";
        class NullProgram : public HighLevelGpuProgram
        {
        protected:
                /** Internal load implementation, must be implemented by subclasses.
                */
                void loadFromSource(void) {}
                /** Internal method for creating an appropriate low-level program from this
                high-level program, must be implemented by subclasses. */
                void createLowLevelImpl(void) {}
                /// Internal unload implementation, must be implemented by subclasses
                void unloadHighLevelImpl(void) {}
                /// Populate the passed parameters with name->index map, must be overridden
                void populateParameterNames(GpuProgramParametersSharedPtr params)
                {
                        // Skip the normal implementation
                        // Ensure we don't complain about missing parameter names
                        params->setIgnoreMissingParams(true);

                }
                void buildConstantDefinitions() const
                {
                        // do nothing
                }
        public:
                NullProgram(ResourceManager* creator, 
                        const String& name, ResourceHandle handle, const String& group, 
                        bool isManual, ManualResourceLoader* loader)
                        : HighLevelGpuProgram(creator, name, handle, group, isManual, loader){}
                ~NullProgram() {}
                /// Overridden from GpuProgram - never supported
                bool isSupported(void) const { return false; }
                /// Overridden from GpuProgram
                const String& getLanguage(void) const { return sNullLang; }

                /// Overridden from StringInterface
                bool setParameter(const String& name, const String& value)
                {
                        // always silently ignore all parameters so as not to report errors on
                        // unsupported platforms
                        return true;
                }

        };
        class NullProgramFactory : public HighLevelGpuProgramFactory
        {
        public:
                NullProgramFactory() {}
                ~NullProgramFactory() {}
                /// Get the name of the language this factory creates programs for
                const String& getLanguage(void) const 
                { 
                        return sNullLang;
                }
                HighLevelGpuProgram* create(ResourceManager* creator, 
                        const String& name, ResourceHandle handle,
                        const String& group, bool isManual, ManualResourceLoader* loader)
                {
                        return new NullProgram(creator, name, handle, group, isManual, loader);
                }
                void destroy(HighLevelGpuProgram* prog)
                {
                        delete prog;
                }

        };
        //-----------------------------------------------------------------------
        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);    

                mNullFactory = new NullProgramFactory();
                addFactory(mNullFactory);
                mUnifiedFactory = new UnifiedHighLevelGpuProgramFactory();
                addFactory(mUnifiedFactory);
        }
        //-----------------------------------------------------------------------
        HighLevelGpuProgramManager::~HighLevelGpuProgramManager()
        {
                delete mUnifiedFactory;
                delete mNullFactory;
        ResourceGroupManager::getSingleton()._unregisterResourceManager(mResourceType);    
        }
    //---------------------------------------------------------------------------
        void HighLevelGpuProgramManager::addFactory(HighLevelGpuProgramFactory* factory)
        {
                // deliberately allow later plugins to override earlier ones
                mFactories[factory->getLanguage()] = factory;
        }
    //---------------------------------------------------------------------------
    void HighLevelGpuProgramManager::removeFactory(HighLevelGpuProgramFactory* factory)
    {
        // Remove only if equal to registered one, since it might overridden
        // by other plugins
        FactoryMap::iterator it = mFactories.find(factory->getLanguage());
        if (it != mFactories.end() && it->second == factory)
        {
            mFactories.erase(it);
        }
    }
    //---------------------------------------------------------------------------
        HighLevelGpuProgramFactory* HighLevelGpuProgramManager::getFactory(const String& language)
        {
                FactoryMap::iterator i = mFactories.find(language);

                if (i == mFactories.end())
                {
                        // use the null factory to create programs that will never be supported
                        i = mFactories.find(sNullLang);
                }
                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() 
    {
    }
}