dxvk/src/dxgi/dxgi_format.h

#pragma once

#include "dxgi_include.h"

#include "../dxvk/dxvk_adapter.h"
#include "../dxvk/dxvk_format.h"

namespace dxvk {
  
  /**
   * \brief Format mapping
   * 
   * Maps a DXGI format to a set of Vulkan formats.
   */
  struct DXGI_VK_FORMAT_MAPPING {
    VkFormat              FormatColor   = VK_FORMAT_UNDEFINED;  ///< Corresponding color format
    VkFormat              FormatDepth   = VK_FORMAT_UNDEFINED;  ///< Corresponding depth format
    VkFormat              FormatRaw     = VK_FORMAT_UNDEFINED;  ///< Bit-compatible integer format
    VkImageAspectFlags    AspectColor   = 0;                    ///< Defined aspects for the color format
    VkImageAspectFlags    AspectDepth   = 0;                    ///< Defined aspects for the depth format
    VkComponentMapping    Swizzle       = {                     ///< Color component swizzle
      VK_COMPONENT_SWIZZLE_IDENTITY, VK_COMPONENT_SWIZZLE_IDENTITY,
      VK_COMPONENT_SWIZZLE_IDENTITY, VK_COMPONENT_SWIZZLE_IDENTITY };
  };
  
  /**
   * \brief Format info
   * 
   * Stores a Vulkan image format for a given
   * DXGI format and some additional information
   * on how resources with the particular format
   * are supposed to be used.
   */
  struct DXGI_VK_FORMAT_INFO {
    VkFormat              Format      = VK_FORMAT_UNDEFINED;  ///< Corresponding color format
    VkImageAspectFlags    Aspect      = 0;                    ///< Defined image aspect mask
    VkComponentMapping    Swizzle     = {                     ///< Component swizzle
      VK_COMPONENT_SWIZZLE_IDENTITY, VK_COMPONENT_SWIZZLE_IDENTITY,
      VK_COMPONENT_SWIZZLE_IDENTITY, VK_COMPONENT_SWIZZLE_IDENTITY };
  };
  
  /**
   * \brief Format lookup mode
   * 
   * When looking up an image format, additional information
   * might be needed on how the image is going to be used.
   * This is used to properly map typeless formats and color
   * formats to depth formats if they are used on depth images.
   */
  enum DXGI_VK_FORMAT_MODE {
    DXGI_VK_FORMAT_MODE_ANY   = 0,  ///< Color first, then depth
    DXGI_VK_FORMAT_MODE_COLOR = 1,  ///< Color only
    DXGI_VK_FORMAT_MODE_DEPTH = 2,  ///< Depth only
    DXGI_VK_FORMAT_MODE_RAW   = 3,  ///< Unsigned integer format
  };
  
  
  /**
   * \brief Format family
   * 
   * Stores a set of compatible formats. This can
   * be used to aggregate formats for the image
   * format list extension.
   */
  struct DXGI_VK_FORMAT_FAMILY {
    constexpr static size_t MaxSize = 8;

    DXGI_VK_FORMAT_FAMILY() { }
    DXGI_VK_FORMAT_FAMILY(const std::initializer_list<VkFormat>& FormatList) {
      for (VkFormat f : FormatList)
        Add(f);
    }

    BOOL Add(VkFormat Format) {
      for (UINT i = 0; i < FormatCount; i++) {
        if (Formats[i] == Format)
          return TRUE;
      }

      if (FormatCount < MaxSize) {
        Formats[FormatCount++] = Format;
        return TRUE;
      } return FALSE;
    }

    UINT     FormatCount = 0;
    VkFormat Formats[MaxSize];
  };
  
  
  /**
   * \brief Format table
   * 
   * Initializes a format table for a specific
   * device and provides methods to look up
   * formats.
   */
  class DXGIVkFormatTable {
    
  public:
    
    DXGIVkFormatTable(
      const Rc<DxvkAdapter>& adapter);
    ~DXGIVkFormatTable();
    
    /**
     * \brief Retrieves info for a given DXGI format
     * 
     * \param [in] Format The DXGI format to look up
     * \param [in] Mode the format lookup mode
     * \returns Format info
     */
    DXGI_VK_FORMAT_INFO GetFormatInfo(
            DXGI_FORMAT         Format,
            DXGI_VK_FORMAT_MODE Mode) const;
    
    /**
     * \brief Retrieves a format family
     * 
     * \param [in] Format The format to query
     * \param [in] Mode Image format mode
     * \returns Image format family
     */
    DXGI_VK_FORMAT_FAMILY GetFormatFamily(
            DXGI_FORMAT         Format,
            DXGI_VK_FORMAT_MODE Mode) const;
    
  private:
    
    std::array<DXGI_VK_FORMAT_MAPPING, 133> m_dxgiFormats;
    std::array<DXGI_VK_FORMAT_FAMILY,  133> m_dxgiFamilies;
    
    const DXGI_VK_FORMAT_MAPPING* GetFormatMapping(
            DXGI_FORMAT           Format) const;

    bool CheckImageFormatSupport(
      const Rc<DxvkAdapter>&      Adapter,
            VkFormat              Format,
            VkFormatFeatureFlags  Features) const;
    
    void RemapDepthFormat(
            DXGI_FORMAT           Format,
            VkFormat              Target);
        
  };
  
};