OgreGL3PlusHardwareBufferManager.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) 2000-2013 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
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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*/

#ifndef __GL3PlusHardwareBufferManager_H__
#define __GL3PlusHardwareBufferManager_H__

#include "OgreGL3PlusPrerequisites.h"
#include "OgreHardwareBufferManager.h"

namespace Ogre {
    // Default threshold at which glMapBuffer becomes more efficient than glBufferSubData (32k?)
#   define OGRE_GL_DEFAULT_MAP_BUFFER_THRESHOLD (1024 * 32)

    class _OgreGL3PlusExport GL3PlusHardwareBufferManagerBase : public HardwareBufferManagerBase
    {
        protected:
            char* mScratchBufferPool;
            OGRE_MUTEX(mScratchMutex);
            size_t mMapBufferThreshold;

        public:
            GL3PlusHardwareBufferManagerBase();
            ~GL3PlusHardwareBufferManagerBase();
            HardwareVertexBufferSharedPtr createVertexBuffer(size_t vertexSize,
                size_t numVerts, HardwareBuffer::Usage usage, bool useShadowBuffer = false);
            HardwareIndexBufferSharedPtr createIndexBuffer(
                HardwareIndexBuffer::IndexType itype, size_t numIndexes,
                HardwareBuffer::Usage usage, bool useShadowBuffer = false);
            HardwareUniformBufferSharedPtr createUniformBuffer(size_t sizeBytes, HardwareBuffer::Usage usage,
                                                               bool useShadowBuffer, const String& name = "");
            HardwareUniformBufferSharedPtr createUniformBuffer(size_t sizeBytes, HardwareBuffer::Usage usage,
                                                               bool useShadowBuffer, size_t binding, const String& name = "");
            HardwareCounterBufferSharedPtr createCounterBuffer(size_t sizeBytes, HardwareBuffer::Usage usage,
                                                               bool useShadowBuffer, const String& name = "");
            RenderToVertexBufferSharedPtr createRenderToVertexBuffer();

            static GLenum getGLUsage(unsigned int usage);

            static GLenum getGLType(unsigned int type);

            void* allocateScratch(uint32 size);

            void deallocateScratch(void* ptr);

            size_t getGLMapBufferThreshold() const;
            void setGLMapBufferThreshold( const size_t value );
};

    class _OgreGL3PlusExport GL3PlusHardwareBufferManager : public HardwareBufferManager
    {
    public:
        GL3PlusHardwareBufferManager()
            : HardwareBufferManager(OGRE_NEW GL3PlusHardwareBufferManagerBase()) 
        {

        }
        ~GL3PlusHardwareBufferManager()
        {
            OGRE_DELETE mImpl;
        }

        static GLenum getGLUsage(unsigned int usage) 
            { return GL3PlusHardwareBufferManagerBase::getGLUsage(usage); }

        static GLenum getGLType(unsigned int type)
            { return GL3PlusHardwareBufferManagerBase::getGLType(type); }

        void* allocateScratch(uint32 size)
        {
            return static_cast<GL3PlusHardwareBufferManagerBase*>(mImpl)->allocateScratch(size);
        }

        void deallocateScratch(void* ptr)
        {
            static_cast<GL3PlusHardwareBufferManagerBase*>(mImpl)->deallocateScratch(ptr);
        }

        size_t getGLMapBufferThreshold() const
        {
            return static_cast<GL3PlusHardwareBufferManagerBase*>(mImpl)->getGLMapBufferThreshold();
        }
        void setGLMapBufferThreshold( const size_t value )
        {
            static_cast<GL3PlusHardwareBufferManagerBase*>(mImpl)->setGLMapBufferThreshold(value);
        }

    };

}

#endif