OgreD3D11HardwarePixelBuffer.h

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/*
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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

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The above copyright notice and this permission notice shall be included in
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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*/
#ifndef __D3D11PIXELBUFFER_H__
#define __D3D11PIXELBUFFER_H__

#include "OgreD3D11Prerequisites.h"
#include "OgreHardwarePixelBuffer.h"
#include "OgreD3D11Driver.h"

struct ID3D11Resource;

namespace Ogre {

    class D3D11HardwarePixelBuffer: public HardwarePixelBuffer
    {
    protected:
        PixelBox lockImpl(const Image::Box lockBox,  LockOptions options);

        void unlockImpl(void);

        D3D11Device & mDevice;

        D3D11Texture * mParentTexture;
        size_t mSubresourceIndex;

        // if the usage is static - alloc at lock then use device UpdateSubresource when unlock and free memory
        int8 * mDataForStaticUsageLock; 

        size_t mFace;

        Image::Box mLockBox;
        PixelBox mCurrentLock;
        LockOptions mCurrentLockOptions;

        D3D11_BOX OgreImageBoxToDx11Box(const Image::Box &inBox) const;

        void fromD3DLock(PixelBox &rval, const DXGI_MAPPED_RECT &lrect);

        typedef vector<RenderTexture*>::type SliceTRT;
        SliceTRT mSliceTRT;

        void createStagingBuffer();
        bool mUsingStagingBuffer;
        ID3D11Resource *mStagingBuffer;
        
        void _map(ID3D11Resource *res, D3D11_MAP flags, PixelBox & box);
        void *_mapstagingbuffer(D3D11_MAP flags);
        void *_mapstaticbuffer(PixelBox lock);
        void _unmap(ID3D11Resource *res);
        void _unmapstagingbuffer(bool copyback = true);
        void _unmapstaticbuffer();
    public:
        D3D11HardwarePixelBuffer(D3D11Texture * parentTexture, D3D11Device & device, size_t subresourceIndex,
            size_t width, size_t height, size_t depth, size_t face, PixelFormat format, HardwareBuffer::Usage usage);

        void blit(const HardwarePixelBufferSharedPtr &src, const Image::Box &srcBox, const Image::Box &dstBox);

        void blitFromMemory(const PixelBox &src, const Image::Box &dstBox);

        void blitToMemory(const Image::Box &srcBox, const PixelBox &dst);

        void _genMipmaps();


        ~D3D11HardwarePixelBuffer();

        RenderTexture *getRenderTarget(size_t zoffset);

        virtual void _clearSliceRTT(size_t zoffset)
        {
            if (mSliceTRT.size() > zoffset)
            {
                mSliceTRT[zoffset] = 0;
            }
        }

        D3D11Texture * getParentTexture() const;
        size_t getSubresourceIndex() const;
        size_t getFace() const;
    };
};
#endif