OgreGLSLLinkProgramManager.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) 2000-2011 Torus Knot Software Ltd

Permission is hereby granted, free of charge, to any person obtaining a copy
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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
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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*/
#ifndef __GLSLLinkProgramManager_H__
#define __GLSLLinkProgramManager_H__

#include "OgreGLPrerequisites.h"
#include "OgreSingleton.h"

#include "OgreGLSLExtSupport.h"
#include "OgreGLSLLinkProgram.h"

namespace Ogre {


    class _OgreGLExport GLSLLinkProgramManager : public Singleton<GLSLLinkProgramManager>
    {

    private:
    
        typedef map<uint64, GLSLLinkProgram*>::type LinkProgramMap;
        typedef LinkProgramMap::iterator LinkProgramIterator;

        LinkProgramMap mLinkPrograms; 

        GLSLGpuProgram* mActiveVertexGpuProgram;
        GLSLGpuProgram* mActiveGeometryGpuProgram;
        GLSLGpuProgram* mActiveFragmentGpuProgram;
        GLSLLinkProgram* mActiveLinkProgram;

        typedef map<String, GLenum>::type StringToEnumMap;
        StringToEnumMap mTypeEnumMap;

        void completeDefInfo(GLenum gltype, GpuConstantDefinition& defToUpdate);
        bool completeParamSource(const String& paramName,
            const GpuConstantDefinitionMap* vertexConstantDefs, 
            const GpuConstantDefinitionMap* geometryConstantDefs,
            const GpuConstantDefinitionMap* fragmentConstantDefs,
            GLUniformReference& refToUpdate);

    public:

        GLSLLinkProgramManager(void);

        ~GLSLLinkProgramManager(void);

        GLSLLinkProgram* getActiveLinkProgram(void);

        void setActiveFragmentShader(GLSLGpuProgram* fragmentGpuProgram);
        void setActiveGeometryShader(GLSLGpuProgram* geometryGpuProgram);
        void setActiveVertexShader(GLSLGpuProgram* vertexGpuProgram);

        void extractUniforms(GLhandleARB programObject, 
            const GpuConstantDefinitionMap* vertexConstantDefs, 
            const GpuConstantDefinitionMap* geometryConstantDefs,
            const GpuConstantDefinitionMap* fragmentConstantDefs,
            GLUniformReferenceList& list);
        void extractConstantDefs(const String& src, GpuNamedConstants& constantDefs, 
            const String& filename);

        static GLSLLinkProgramManager& getSingleton(void);
        static GLSLLinkProgramManager* getSingletonPtr(void);

    };

}

#endif // __GLSLLinkProgramManager_H__