OgreShaderProgramManager.h

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

Copyright (c) 2000-2014 Torus Knot Software Ltd
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
-----------------------------------------------------------------------------
*/
#ifndef _ShaderProgramManager_
#define _ShaderProgramManager_

#include "OgreShaderPrerequisites.h"
#include "OgreShaderProgram.h"
#include "OgreShaderProgramWriter.h"

namespace Ogre {    
namespace RTShader {

class _OgreRTSSExport ProgramManager : public Singleton<ProgramManager>, public RTShaderSystemAlloc
{
// Interface.
public:

    ProgramManager();

    ~ProgramManager();


    static ProgramManager& getSingleton();  

    static ProgramManager* getSingletonPtr();

    void acquirePrograms(Pass* pass, TargetRenderState* renderState);

    void releasePrograms(Pass* pass, TargetRenderState* renderState);

    void flushGpuProgramsCache();

protected:

    //-----------------------------------------------------------------------------
    typedef map<String, GpuProgramPtr>::type            GpuProgramsMap;
    typedef GpuProgramsMap::iterator                    GpuProgramsMapIterator;
    typedef GpuProgramsMap::const_iterator              GpuProgramsMapConstIterator;

    //-----------------------------------------------------------------------------
    typedef set<Program*>::type                         ProgramList;
    typedef ProgramList::iterator                       ProgramListIterator;
    typedef map<String, ProgramWriter*>::type           ProgramWriterMap;
    typedef ProgramWriterMap::iterator                  ProgramWriterIterator;
    typedef vector<ProgramWriterFactory*>::type         ProgramWriterFactoryList;
    
    //-----------------------------------------------------------------------------
    typedef map<String, ProgramProcessor*>::type        ProgramProcessorMap;
    typedef ProgramProcessorMap::iterator               ProgramProcessorIterator;
    typedef ProgramProcessorMap::const_iterator         ProgramProcessorConstIterator;
    typedef vector<ProgramProcessor*>::type             ProgramProcessorList;

    
protected:
    void createDefaultProgramProcessors();
    
    void destroyDefaultProgramProcessors();

    void createDefaultProgramWriterFactories();

    void destroyDefaultProgramWriterFactories();

    void destroyProgramWriters();

    Program* createCpuProgram(GpuProgramType type);

    void destroyCpuProgram(Program* shaderProgram);

    bool createGpuPrograms(ProgramSet* programSet);
        
    String generateGUID(const String& programString);

    GpuProgramPtr createGpuProgram(Program* shaderProgram, 
        ProgramWriter* programWriter,
        const String& language,
        const String& profiles,
        const StringVector& profilesList,
        const String& cachePath);

    void addProgramProcessor(ProgramProcessor* processor);

    void removeProgramProcessor(ProgramProcessor* processor);

    void destroyGpuProgram(GpuProgramPtr& gpuProgram);

    void flushGpuProgramsCache(GpuProgramsMap& gpuProgramsMap);
    
    size_t getVertexShaderCount() const { return mVertexShaderMap.size(); }

    size_t getFragmentShaderCount() const { return mFragmentShaderMap.size(); }

    void synchronizePixelnToBeVertexOut(ProgramSet* programSet);

    void bindUniformParameters(Program* pCpuProgram, const GpuProgramParametersSharedPtr& passParams);


protected:
    

protected:
    // CPU programs list.                   
    ProgramList mCpuProgramsList;
    // Map between target language and shader program writer.                   
    ProgramWriterMap mProgramWritersMap;
    // Map between target language and shader program processor.    
    ProgramProcessorMap mProgramProcessorsMap;
    // Holds standard shader writer factories
    ProgramWriterFactoryList mProgramWriterFactories;
    // The generated vertex shaders.
    GpuProgramsMap mVertexShaderMap;
    // The generated fragment shaders.
    GpuProgramsMap mFragmentShaderMap;
    // The default program processors.
    ProgramProcessorList mDefaultProgramProcessors;

private:
    friend class ProgramSet;
    friend class TargetRenderState;
    friend class ShaderGenerator;
};

}
}

#endif