Function pickSurfaceFormat

samples/utils/utils.cpp:539–572

    }

    vk::SurfaceFormatKHR pickSurfaceFormat( std::vector<vk::SurfaceFormatKHR> const & formats )
    {
      assert( !formats.empty() );
      vk::SurfaceFormatKHR pickedFormat = formats[0];
      if ( formats.size() == 1 )
      {
        if ( formats[0].format == vk::Format::eUndefined )
        {
          pickedFormat.format     = vk::Format::eB8G8R8A8Unorm;
          pickedFormat.colorSpace = vk::ColorSpaceKHR::eSrgbNonlinear;
        }
      }
      else
      {
        // request several formats, the first found will be used
        vk::Format        requestedFormats[]  = { vk::Format::eB8G8R8A8Unorm, vk::Format::eR8G8B8A8Unorm, vk::Format::eB8G8R8Unorm, vk::Format::eR8G8B8Unorm };
        vk::ColorSpaceKHR requestedColorSpace = vk::ColorSpaceKHR::eSrgbNonlinear;
        for ( size_t i = 0; i < sizeof( requestedFormats ) / sizeof( requestedFormats[0] ); i++ )
        {
          vk::Format requestedFormat = requestedFormats[i];
          auto       it              = std::find_if( formats.begin(),
                                  formats.end(),
                                  [requestedFormat, requestedColorSpace]( vk::SurfaceFormatKHR const & f )
                                  { return ( f.format == requestedFormat ) && ( f.colorSpace == requestedColorSpace ); } );
          if ( it != formats.end() )
          {
            pickedFormat = *it;
            break;
          }
        }
      }
      assert( pickedFormat.colorSpace == vk::ColorSpaceKHR::eSrgbNonlinear );
      return pickedFormat;
    }

    void setImageLayout(
      vk::CommandBuffer const & commandBuffer, vk::Image image, vk::Format format, vk::ImageLayout oldImageLayout, vk::ImageLayout newImageLayout )