cxGPUImageBuffer.h

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/*=========================================================================
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Copyright (c) 2008-2014, SINTEF Department of Medical Technology
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#ifndef CXGPUIMAGEBUFFER_H_
#define CXGPUIMAGEBUFFER_H_

#include "cxResourceExport.h"
#include "cxPrecompiledHeader.h"

#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>
#include <map>
#include <list>
#include "vtkForwardDeclarations.h"

namespace cx
{

class cxResource_EXPORT GPUImageDataBuffer
{
public:
        virtual ~GPUImageDataBuffer() {}
        virtual void allocate() = 0;
//      /** Assuming imageData is changed,
//        * send vtkImageData to GPU.
//        */
//      virtual void updateTexture() = 0;
        virtual void bind(int textureUnitIndex) = 0;
        virtual int getMemorySize() = 0;

        virtual unsigned int getTextureUid() const = 0;
        //virtual vtkImageDataPtr getVtkImageData() = 0;
};

typedef boost::shared_ptr<GPUImageDataBuffer> GPUImageDataBufferPtr;
typedef boost::weak_ptr<GPUImageDataBuffer> GPUImageDataBufferWeakPtr;

cxResource_EXPORT GPUImageDataBufferPtr createGPUImageDataBuffer(vtkImageDataPtr volume);

class cxResource_EXPORT GPUImageLutBuffer
{
public:
        virtual ~GPUImageLutBuffer() {}
        virtual void allocate() = 0;
//      /** If data is changed, send data to GPU.
//        */
//      virtual void updateTexture() = 0;
        virtual void bind(int textureUnitIndex) = 0;
        virtual int getLutSize() const = 0;
};

typedef boost::shared_ptr<GPUImageLutBuffer> GPUImageLutBufferPtr;
typedef boost::weak_ptr<GPUImageLutBuffer> GPUImageLutBufferWeakPtr;

cxResource_EXPORT GPUImageDataBufferPtr createGPUImageDataBuffer(vtkImageDataPtr volume);
cxResource_EXPORT GPUImageLutBufferPtr createGPUImageLutBuffer(vtkUnsignedCharArrayPtr lut);

class cxResource_EXPORT GPUImageBufferRepository
{
public:
        static GPUImageBufferRepository* getInstance();
        static void shutdown();

        GPUImageDataBufferPtr getGPUImageDataBuffer(vtkImageDataPtr volume);
        GPUImageLutBufferPtr getGPUImageLutBuffer(vtkUnsignedCharArrayPtr lut);
        int getMemoryUsage(int *textures);
        void clear();
private:
        GPUImageBufferRepository();
        ~GPUImageBufferRepository();
        class GPUImageBufferRepositoryInternal* mInternal;
        static GPUImageBufferRepository* mInstance;
        void tearDown();
};

}

#endif /*CXGPUIMAGEBUFFER_H_*/