## 2.10. Common Object Types

Some types of Vulkan objects are used in many different structures and command parameters, and are described here. These types include offsets, extents, and rectangles.

### 2.10.1. Offsets

Offsets are used to describe a pixel location within an image or framebuffer, as an (x,y) location for two-dimensional images, or an (x,y,z) location for three-dimensional images.

A two-dimensional offsets is defined by the structure:

    typedef struct VkOffset2D {
        int32_t    x;
        int32_t    y;
    } VkOffset2D;

A three-dimensional offset is defined by the structure:

    typedef struct VkOffset3D {
        int32_t    x;
        int32_t    y;
        int32_t    z;
    } VkOffset3D;

### 2.10.2. Extents

Extents are used to describe the size of a rectangular region of pixels within an image or framebuffer, as (width,height) for two-dimensional images, or as (width,height,depth) for three-dimensional images.

A two-dimensional extent is defined by the structure:

    typedef struct VkExtent2D {
        uint32_t    width;
        uint32_t    height;
    } VkExtent2D;

A three-dimensional extent is defined by the structure:

    typedef struct VkExtent3D {
        uint32_t    width;
        uint32_t    height;
        uint32_t    depth;
    } VkExtent3D;

### 2.10.3. Rectangles

Rectangles are used to describe a specified rectangular region of pixels within an image or framebuffer. Rectangles include both an offset and an extent of the same dimensionality, as described above. Two-dimensional rectangles are defined by the structure

    typedef struct VkRect2D {
        VkOffset2D    offset;
        VkExtent2D    extent;
    } VkRect2D;