anchor.diff:  
   Clearing images
   ~~~~~~~~~~~~~~~
  +
  +Clearing tests need to validate that clearing happen as expected for both simple and more complex cases:
  +
  +* Clear the attachments.
  +** Whole and partial clear.
   
   [source,c]
   ----
  
positive.code: Image copies
  ~~~~~~~~~~~~
  
  .Spec issues
   * What kind of copies are allowed? Blits?
   * Copy is simply reinterpretation of data?
   * Does blit unpack & pack data like in GL?
   ** sRGB conversions
  
  [source,c]
  ----
  typedef struct {
      VkImageSubresource                          srcSubresource;
      VkOffset3D                                  srcOffset;
      VkImageSubresource                          destSubresource;
      VkOffset3D                                  destOffset;
      VkExtent3D                                  extent;
  } VkImageCopy;
  
  typedef struct {
      VkImageSubresource                          srcSubresource;
      VkOffset3D                                  srcOffset;
      VkExtent3D                                  srcExtent;
      VkImageSubresource                          destSubresource;
      VkOffset3D                                  destOffset;
      VkExtent3D                                  destExtent;
  } VkImageBlit;
  
negative.code: Copies between buffers and images
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  The copies between buffers and images are used for checking the rendering result across the vulkancts so it
  is well tested. This tests should cover corner cases.
  
  * Various sizes
  ** Whole and partial copies
  * Multiple copies in one command
  
  [source,c]
  ----
  typedef struct {
      VkDeviceSize                                bufferOffset;
      uint32_t                                    bufferRowLength;
      uint32_t                                    bufferImageHeight;
      VkImageSubresourceLayers                    imageSubresource;
      VkOffset3D                                  imageOffset;
      VkExtent3D                                  imageExtent;
  } VkBufferImageCopy;
  