#pragma region CPL License
/*
Nuclex Native Framework
Copyright (C) 2002-2013 Nuclex Development Labs

This library is free software; you can redistribute it and/or
modify it under the terms of the IBM Common Public License as
published by the IBM Corporation; either version 1.0 of the
License, or (at your option) any later version.

This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
IBM Common Public License for more details.

You should have received a copy of the IBM Common Public
License along with this library
*/
#pragma endregion // CPL License

#ifndef NUCLEX_GRAPHICS_RASTERIZATION_DIRECT3D11CONSTANTBUFFEROBSERVER_H
#define NUCLEX_GRAPHICS_RASTERIZATION_DIRECT3D11CONSTANTBUFFEROBSERVER_H

#include "Nuclex/Graphics/Config.h"
#include "Nuclex/Graphics/Rasterization/GenericConstantBuffer.h"
#include "../Direct3D11Api.h"

namespace Nuclex { namespace Graphics { namespace Rasterization {

  // ------------------------------------------------------------------------------------------- //

  class Direct3D11RasterizerResources;

  // ------------------------------------------------------------------------------------------- //

}}} // namespace Nuclex::Graphics::Rasterization

namespace Nuclex { namespace Graphics { namespace Rasterization {

  // ------------------------------------------------------------------------------------------- //

  ///<summary>Manages an attached Direct3D 11 constant buffer</summary>
  class Direct3D11ConstantBufferObserver : public GenericConstantBuffer::Observer {

    /// <summary>Initializes a new Direct3D 11 constant buffer</summary>
    /// <param name="resources">Manager the index buffer belongs to</param>
    /// <param name="indexBuffer">Index buffer the observer is attached to</param>
    public: Direct3D11ConstantBufferObserver(
      Direct3D11RasterizerResources &resources, GenericConstantBuffer *indexBuffer
    );

    /// <summary>Frees all resources owned by the constant buffer observer</summary>
    public: virtual ~Direct3D11ConstantBufferObserver();

    /// <summary>Called right before the buffer is destroyed</summary>
    public: void Destroying();

    /// <summary>Called when the buffer has been cleared</summary>
    public: void Cleared();

    /// <summary>Called when the contents of the buffer have changed</summary>
    /// <param name="offset">
    ///   Offset in the buffer from which on its contents have changed
    /// </param>
    /// <param name="count">Number of bytes that have changed in the buffer</param>
    public: void Changed(std::size_t offset, std::size_t count);

    /// <summary>Retrieves the agnostic constant buffer being observed</summary>
    /// <returns>The agnostic constant buffer being observed</returns>
    public: GenericConstantBuffer *GetResource() const { return this->constantBuffer; }

    /// <summary>Retrieves the Direct3D constant buffer the observer is managing</summary>
    /// <returns>The observer's Direct3D constant buffer</returns>
    public: const ID3D11BufferPtr &GetDirect3DConstantBuffer() const {
      return this->direct3DConstantBuffer;
    }

    /// <summary>Creates a Direct3D constant buffer matching the observed one</summary>
    private: void createDirect3DConstantBuffer();

    private: Direct3D11ConstantBufferObserver(const Direct3D11ConstantBufferObserver &);
    private: Direct3D11ConstantBufferObserver &operator =(
      const Direct3D11ConstantBufferObserver &
    );

    /// <summary>Resource manager the constant buffer observer belongs to</summary>
    private: Direct3D11RasterizerResources &resources;
    /// <summary>Constant buffer this observer is attached to</summary>
    private: GenericConstantBuffer *constantBuffer;
    /// <summary>Constant buffer managed by this observer</summary>
    private: ID3D11BufferPtr direct3DConstantBuffer;
    /// <summary>Whether the Direct3D device supports NoOverwrite locks</summary>
    private: bool noOverwriteLockSupported;
    /// <summary>Number of bytes currently used by the buffer</summary>
    private: std::size_t usedBytes;

  };

  // ------------------------------------------------------------------------------------------- //

}}} // namespace Nuclex::Graphics::Rasterization

#endif // NUCLEX_GRAPHICS_RASTERIZATION_DIRECT3D11CONSTANTBUFFEROBSERVER_H