#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_DIRECT3D11CONVERTERS_H
#define NUCLEX_GRAPHICS_RASTERIZATION_DIRECT3D11CONVERTERS_H

#include "Nuclex/Graphics/Rasterization/Usage.h"
#include "Nuclex/Graphics/Rasterization/PixelFormat.h"
#include "Nuclex/Graphics/Rasterization/Topology.h"
#include "Nuclex/Graphics/Rasterization/FillMode.h"
#include "Nuclex/Graphics/Rasterization/CullMode.h"

#include <stdexcept>

#define WIN32_LEAN_AND_MEAN
#define VC_EXTRALEAN
#define NO_MINMAX
#include <Windows.h>
#include <windowsx.h>

#define INITGUID 1
#define D3D11_NO_HELPERS
#include <d3d11.h>

// Direct3D 11.1 requires Windows 8 or later.
#if defined(NUCLEX_GRAPHICS_DIRECT3D11_1)
#include <d3d11_1.h>
#endif

namespace Nuclex { namespace Graphics { namespace Rasterization {

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

  /// <summary>Converts an agnostic usage into a Direct3D usage</summary>
  /// <param name="usage">Usage that will be converted</param>
  /// <returns>The equivalent Direct3D usage</returns>
  inline D3D11_USAGE direct3DUsageFromUsage(Usage::Enum usage) {
    switch(usage) {
      case Usage::Immutable: { return D3D11_USAGE_IMMUTABLE; }
      case Usage::GpuChangeable: { return D3D11_USAGE_DEFAULT; }
      case Usage::CpuToGpuTransfer: { return D3D11_USAGE_DYNAMIC; }
      case Usage::GpuToCpuTransfer: { return D3D11_USAGE_STAGING; }
      default: {
        throw std::runtime_error("Unsupported resource usage");
      }
    }
  }

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

  /// <summary>Converts an agnostic usage into a Direct3D CPU access flag</summary>
  /// <param name="usage">Usage that will be converted</param>
  /// <returns>The equivalent Direct3D CPU access flag</returns>
  inline D3D11_CPU_ACCESS_FLAG direct3DCpuAccessFromUsage(Usage::Enum usage) {
    switch(usage) {
      case Usage::Immutable: { return D3D11_CPU_ACCESS_FLAG(0); }
      case Usage::GpuChangeable: { return D3D11_CPU_ACCESS_FLAG(0); }
      case Usage::CpuToGpuTransfer: { return D3D11_CPU_ACCESS_WRITE; }
      case Usage::GpuToCpuTransfer: { return D3D11_CPU_ACCESS_READ; }
      default: {
        throw std::runtime_error("Unsupported resource usage");
      }
    }
  }

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

  /// <summary>Converts an agnostic pixel format into a Direct3D pixel format</summary>
  /// <param name="pixelFormat">Pixel format that will be converted</param>
  /// <returns>The equivalent Direct3D pixel format</returns>
  inline DXGI_FORMAT direct3DFormatFromPixelFormat(PixelFormat::Enum pixelFormat) {
    switch(pixelFormat) {
      case PixelFormat::R8_Unsigned: { return DXGI_FORMAT_R8_UNORM; }
      case PixelFormat::R8_G8_Signed: { return DXGI_FORMAT_R8G8_SNORM; }
      case PixelFormat::B5_G6_R5_Unsigned: { return DXGI_FORMAT_B5G6R5_UNORM; }
      case PixelFormat::B4_G4_R4_A4_Unsigned: { return DXGI_FORMAT_B4G4R4A4_UNORM; }
      case PixelFormat::R8_G8_B8_A8_Unsigned: { return DXGI_FORMAT_R8G8B8A8_UNORM; }
      case PixelFormat::R8_G8_B8_A8_Signed: { return DXGI_FORMAT_R8G8B8A8_SNORM; }
      case PixelFormat::BC1_Compressed: { return DXGI_FORMAT_BC1_UNORM; }
      case PixelFormat::BC2_Compressed: { return DXGI_FORMAT_BC2_UNORM; }
      case PixelFormat::BC3_Compressed: { return DXGI_FORMAT_BC3_UNORM; }
      case PixelFormat::Modern_A8_Unsigned: { return DXGI_FORMAT_A8_UNORM; }
      case PixelFormat::Modern_R16_Unsigned: { return DXGI_FORMAT_R16_UNORM; }
      case PixelFormat::Modern_R16_G16_Unsigned: { return DXGI_FORMAT_R16G16_UNORM; }
      case PixelFormat::Modern_R16_G16_Float: { return DXGI_FORMAT_R16G16_FLOAT; }
      case PixelFormat::Modern_R16_G16_B16_A16_Unsigned: {
        return DXGI_FORMAT_R16G16B16A16_UNORM;
      }
      case PixelFormat::Modern_R16_G16_B16_A16_Float: { return DXGI_FORMAT_R16G16B16A16_FLOAT; }
      default: {
        throw std::runtime_error("Unsupported pixel format");
      }
    }
  }

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

  /// <summary>Converts an agnostic pixel format into a Direct3D pixel format</summary>
  /// <param name="pixelFormat">Pixel format that will be converted</param>
  /// <returns>The equivalent Direct3D pixel format</returns>
  inline D3D11_PRIMITIVE_TOPOLOGY direct3DTopologyFromTopology(Topology::Enum topology) {
    switch(topology) {
      case Topology::Point: { return D3D11_PRIMITIVE_TOPOLOGY_POINTLIST; }
      case Topology::LineList: { return D3D11_PRIMITIVE_TOPOLOGY_LINELIST; }
      case Topology::PolyLine: { return D3D11_PRIMITIVE_TOPOLOGY_LINESTRIP; }
      case Topology::TriangleList: { return D3D11_PRIMITIVE_TOPOLOGY_TRIANGLELIST; }
      case Topology::TriangleStrip: { return D3D11_PRIMITIVE_TOPOLOGY_TRIANGLESTRIP; }
      default: {
        throw std::runtime_error("Unsupported primitive topology");
      }
    }
  }

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

  /// <summary>Converts a fill mode into a Direct3D fill mode</summary>
  /// <param name="fillMode">Fill mode that will be converted</param>
  /// <returns>The equivalent Direct3D fill mode</returns>
  inline D3D11_FILL_MODE direct3DFillModeFromFillMode(FillMode::Enum fillMode) {
    switch(fillMode) {
      case FillMode::Wireframe: { return D3D11_FILL_WIREFRAME; }
      case FillMode::Solid: { return D3D11_FILL_SOLID; }
      default: {
        throw std::runtime_error("Unsupported fill mode");
      }
    }
  }

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

  /// <summary>Converts a cull mode into a Direct3D cull mode</summary>
  /// <param name="cullMode">Cull mode that will be converted</param>
  /// <returns>The equivalent Direct3D cull mode</returns>
  inline D3D11_CULL_MODE direct3DCullModeFromCullMode(CullMode::Enum cullMode) {
    switch(cullMode) {
      // TODO: Given their naming, do D3D cull modes interact with isFrontFaceClockwise?
      case CullMode::None: { return D3D11_CULL_NONE; }
      case CullMode::Clockwise: { return D3D11_CULL_FRONT; }
      case CullMode::CounterClockwise: { return D3D11_CULL_BACK; }
      default: {
        throw std::runtime_error("Unsupported cull mode");
      }
    }
  }

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

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

#endif // NUCLEX_GRAPHICS_RASTERIZATION_DIRECT3D11CONVERTERS_H