#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

// If the library is compiled as a DLL, this ensures symbols are exported
#define NUCLEX_GRAPHICS_SOURCE 1

#include "Direct3D11PolygonOptionsObserver.h"
#include "../Direct3D11RasterizerResources.h"
#include "../Direct3D11Converters.h"

#include <stdexcept>

namespace Nuclex { namespace Graphics { namespace Rasterization {

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

  Direct3D11PolygonOptionsObserver::Direct3D11PolygonOptionsObserver(
    Direct3D11RasterizerResources &resources, PolygonOptions *polygonOptions
  ) :
    resources(resources),
    polygonOptions(polygonOptions) {
    createDirect3DRasterizerState();
  }

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

  Direct3D11PolygonOptionsObserver::~Direct3D11PolygonOptionsObserver() {
    // Our smart pointers will take care of everything
  }

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

  void Direct3D11PolygonOptionsObserver::Destroying() {
    this->resources.PolygonOptionsHolder.Evict(this->polygonOptions, this);
    // Do not do anything below Evict(). It will delete this instance!
  }

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

  void Direct3D11PolygonOptionsObserver::Changed() {
    this->direct3DRasterizerState = nullptr;
    createDirect3DRasterizerState();
  }

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

  void Direct3D11PolygonOptionsObserver::createDirect3DRasterizerState() {
    D3D11_RASTERIZER_DESC rasterizerDescription;

    rasterizerDescription.FillMode = direct3DFillModeFromFillMode(
      this->polygonOptions->GetFillMode()
    );
    rasterizerDescription.CullMode = direct3DCullModeFromCullMode(
      this->polygonOptions->GetCullMode()
    );
    rasterizerDescription.FrontCounterClockwise =
      this->polygonOptions->IsFrontFaceClockwise() ? FALSE : TRUE;
    rasterizerDescription.DepthBias = D3D11_DEFAULT_DEPTH_BIAS;
    rasterizerDescription.DepthBiasClamp = D3D11_DEFAULT_DEPTH_BIAS_CLAMP;
    rasterizerDescription.SlopeScaledDepthBias = D3D11_DEFAULT_SLOPE_SCALED_DEPTH_BIAS;
    rasterizerDescription.DepthClipEnable =
      this->polygonOptions->IsDepthClippingEnabled() ? TRUE : FALSE;
    rasterizerDescription.ScissorEnable =
      this->polygonOptions->IsScissorTestingEnabled() ? TRUE : FALSE;
    rasterizerDescription.MultisampleEnable = FALSE;
    rasterizerDescription.AntialiasedLineEnable = FALSE;

    HRESULT resultHandle = resources.GetDevice()->CreateRasterizerState(
      &rasterizerDescription, &this->direct3DRasterizerState
    );
    if(FAILED(resultHandle)) {
      throw std::runtime_error("Could not create Direct3D 11 rasterizer state");
    }
  }

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

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