#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_DIRECT3D11VERTEXSHADEROBSERVER_H
#define NUCLEX_GRAPHICS_RASTERIZATION_DIRECT3D11VERTEXSHADEROBSERVER_H

#include "Nuclex/Graphics/Config.h"
#include "Nuclex/Graphics/Rasterization/VertexShader.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 Vertex shader</summary>
  class Direct3D11VertexShaderObserver : public VertexShader::Observer {

    /// <summary>Initializes a new Direct3D 11 Vertex shader</summary>
    /// <param name="resources">Manager the Vertex shader belongs to</param>
    /// <param name="vertexShader">Vertex shader the observer is attached to</param>
    public: Direct3D11VertexShaderObserver(
      Direct3D11RasterizerResources &resources, VertexShader *vertexShader
    );

    /// <summary>Frees all resources owned by the vertex shader observer</summary>
    public: virtual ~Direct3D11VertexShaderObserver() {}

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

    /// <summary>Called when a constant buffer has been set</summary>
    /// <param name="constantBufferIndex">
    ///   Index of the constant buffer that has been assigned
    /// </param>
    public: void ConstantBufferChanged(std::size_t constantBufferIndex);

    /// <summary>Called when a texture has been set</summary>
    /// <param name="textureIndex">Index of the texture that has been assigned</param>
    public: void TextureChanged(std::size_t textureIndex);

    /// <summary>Retrieves the agnostic vertex shader being observed</summary>
    /// <returns>The agnostic vertex shader being observed</returns>
    public: VertexShader *GetResource() const { return this->vertexShader; }

    /// <summary>Retrieves the Direct3D vertex shader the observer is managing</summary>
    /// <returns>The observer's Direct3D vertex shader</returns>
    public: const ID3D11VertexShaderPtr &GetDirect3DVertexShader() const {
      return this->direct3DVertexShader;
    }

    private: Direct3D11VertexShaderObserver(const Direct3D11VertexShaderObserver &);
    private: Direct3D11VertexShaderObserver &operator =(const Direct3D11VertexShaderObserver &);

    /// <summary>Resource manager the render target belongs to</summary>
    private: Direct3D11RasterizerResources &resources;
    /// <summary>Vertex shader this observer is attached to</summary>
    private: VertexShader *vertexShader;
    /// <summary>Vertex shader managed by this observer</summary>
    private: ID3D11VertexShaderPtr direct3DVertexShader;

  };

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

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

#endif // NUCLEX_GRAPHICS_RASTERIZATION_DIRECT3D11VERTEXSHADEROBSERVER_H