rocm-systems/projects/clr/rocclr/runtime/device/pal/palconstbuf.hpp

//
// Copyright (c) 2015 Advanced Micro Devices, Inc. All rights reserved.
//

#ifndef PALCONSTBUF_HPP_
#define PALCONSTBUF_HPP_

#include "device/pal/palmemory.hpp"

//! \namespace pal PAL Resource Implementation
namespace pal {

//! Cconstant buffer
class ConstBuffer : public Memory
{
public:
    //! Vector size of the constant buffer
    static const size_t VectorSize  = 16;

    //! Constructor for the ConstBuffer class
    ConstBuffer(
        VirtualGPU&     gpu,    //!< Virtual GPU device object
        size_t          size    //!< size of the constant buffer in vectors
        );

    //! Destructor for the ConstBuffer class
    ~ConstBuffer();

    //! Creates the real HW constant buffer
    bool create();

    /*! \brief Uploads current constant buffer data from sysMemCopy_ to HW
     *
     *  \return True if the data upload was succesful
     */
    bool uploadDataToHw(
        size_t      size    //!< real data size for upload
        );

    //! Returns a pointer to the system memory copy for CB
    address sysMemCopy() const { return sysMemCopy_; }

    //! Returns CB size
    size_t size() const { return size_; }

    //! Returns current write offset for the constant buffer
    size_t wrtOffset() const { return wrtOffset_; }

    //! Returns last write size for the constant buffer
    size_t lastWrtSize() const { return lastWrtSize_; }

private:
    //! Disable copy constructor
    ConstBuffer(const ConstBuffer&);

    //! Disable operator=
    ConstBuffer& operator=(const ConstBuffer&);

    VirtualGPU& gpu_;           //!< Virtual GPU object
    address     sysMemCopy_;    //!< System memory copy
    size_t      size_;          //!< Constant buffer size
    size_t      wrtOffset_;     //!< Current write offset
    size_t      lastWrtSize_;   //!< Last write size
    void*       wrtAddress_;    //!< Write address in CB
};


/*@}*/} // namespace pal

#endif /*PALCONSTBUF_HPP_*/