/*

-----------------------------------------------------------------------------

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 __DefaultHardwareBufferManager_H__

#define __DefaultHardwareBufferManager_H__

#include "OgrePrerequisites.h"

#include "OgreHardwareBufferManager.h"

namespace Ogre {

    /** \addtogroup Core

    *  @{

    */

    /** \addtogroup RenderSystem

    *  @{

    */

    /// Specialisation of HardwareBuffer for emulation

    class _OgreExport DefaultHardwareBuffer : public HardwareBuffer

    {

    private:

        unsigned char* mData;

        void* lockImpl(size_t offset, size_t length, LockOptions options) override;

        void unlockImpl(void) override;

    public:

        DefaultHardwareBuffer(size_t sizeInBytes);

        ~DefaultHardwareBuffer();

        void readData(size_t offset, size_t length, void* pDest) override;

        void writeData(size_t offset, size_t length, const void* pSource, bool discardWholeBuffer = false) override;

        bool isSystemMemory(void) const override { return true; }

    };

    typedef DefaultHardwareBuffer DefaultHardwareUniformBuffer;

    /** Specialisation of HardwareBufferManagerBase to emulate hardware buffers.

        You might want to instantiate this class if you want to utilise

        classes like MeshSerializer without having initialised the 

        rendering system (which is required to create a 'real' hardware

        buffer manager).

    */

    class _OgreExport DefaultHardwareBufferManagerBase : public HardwareBufferManagerBase

    {

    public:

        DefaultHardwareBufferManagerBase();

        ~DefaultHardwareBufferManagerBase();

        HardwareVertexBufferPtr createVertexBuffer(size_t vertexSize, size_t numVerts, HardwareBuffer::Usage usage,

                                                   bool useShadowBuffer = false) override;

        HardwareIndexBufferPtr createIndexBuffer(HardwareIndexBuffer::IndexType itype, size_t numIndexes,

                                                 HardwareBuffer::Usage usage, bool useShadowBuffer = false) override;

        HardwareBufferPtr createUniformBuffer(size_t sizeBytes, HardwareBufferUsage = HBU_CPU_ONLY,

                                              bool = false) override

        {

            return std::make_shared<DefaultHardwareBuffer>(sizeBytes);

        }

    };

    /// DefaultHardwareBufferManager as a Singleton

    class _OgreExport DefaultHardwareBufferManager : public HardwareBufferManager

    {

        std::unique_ptr<HardwareBufferManagerBase> mImpl;

    public:

        DefaultHardwareBufferManager() : mImpl(new DefaultHardwareBufferManagerBase()) {}

        ~DefaultHardwareBufferManager()

        {

            // have to do this before mImpl is gone

            destroyAllDeclarations();

            destroyAllBindings();

        }

        HardwareVertexBufferSharedPtr

            createVertexBuffer(size_t vertexSize, size_t numVerts, HardwareBuffer::Usage usage,

            bool useShadowBuffer = false) override

        {

            return mImpl->createVertexBuffer(vertexSize, numVerts, usage, useShadowBuffer);

        }

        HardwareIndexBufferSharedPtr

            createIndexBuffer(HardwareIndexBuffer::IndexType itype, size_t numIndexes,

            HardwareBuffer::Usage usage, bool useShadowBuffer = false) override

        {

            return mImpl->createIndexBuffer(itype, numIndexes, usage, useShadowBuffer);

        }

        RenderToVertexBufferSharedPtr createRenderToVertexBuffer() override

        {

            return mImpl->createRenderToVertexBuffer();

        }

        HardwareBufferPtr createUniformBuffer(size_t sizeBytes, HardwareBufferUsage usage,

                                              bool useShadowBuffer) override

        {

            return mImpl->createUniformBuffer(sizeBytes, usage, useShadowBuffer);

        }

    };

    /** @} */

    /** @} */

}

#endif