VkBufferImageCopy

For both vkCmdCopyBufferToImage and vkCmdCopyImageToBuffer, each element of pRegions is a structure defined as:

typedef struct VkBufferImageCopy {
    VkDeviceSize bufferOffset;
    uint32_t bufferRowLength;
    uint32_t bufferImageHeight;
    VkImageSubresourceLayers imageSubresource;
    VkOffset3D imageOffset;
    VkExtent3D imageExtent;
} VkBufferImageCopy;

• bufferOffset is the offset in bytes from the start of the buffer object where the image data is copied from or to.
• bufferRowLength and bufferImageHeight specify in texels a subregion of a larger two- or three-dimensional image in buffer memory, and control the addressing calculations. If either of these values is zero, that aspect of the buffer memory is considered to be tightly packed according to the imageExtent.
• imageSubresource is a VkImageSubresourceLayers used to specify the specific image subresources of the image used for the source or destination image data.
• imageOffset selects the initial x, y, z offsets in texels of the sub-region of the source or destination image data.
• imageExtent is the size in texels of the image to copy in width, height and depth.