VkExtensionProperties

VkExtensionProperties is a Vulkan structure that describes a single extension’s properties for enumeration results. It is used when querying which instance or device extensions are available on a Vulkan implementation, or for a specific layer in the device extension case.

The structure contains two members. extensionName is a fixed-size character array that holds the official name of the extension as a null-terminated UTF-8 string, with a maximum length of VK_MAX_EXTENSION_NAME_SIZE minus one for the terminator. specVersion is a 32-bit unsigned integer that denotes the version of the extension’s specification that the implementation supports.

VkExtensionProperties is returned by the enumeration functions vkEnumerateInstanceExtensionProperties and vkEnumerateDeviceExtensionProperties. The latter can optionally take a layerName argument to enumerate extensions provided by a specific layer. Typical usage involves calling the function first to obtain the count of extensions, allocating an array of VkExtensionProperties of that size, and then calling the function again to fill the array with the properties of each supported extension.

Notes and behavior: extensionName identifies the extension and is stable for a given Vulkan version, while specVersion indicates the revision of that extension. Extensions may evolve over time, and specVersion should be consulted in conjunction with the extension’s official documentation. VK_MAX_EXTENSION_NAME_SIZE defines the maximum length for extension names, ensuring consistent storage across implementations.