VkDebugUtilsMessengerCallbackDataEXT

The definition of VkDebugUtilsMessengerCallbackDataEXT is:

typedef struct VkDebugUtilsMessengerCallbackDataEXT {
    VkStructureType sType;
    const void* pNext;
    VkDebugUtilsMessengerCallbackDataFlagsEXT flags;
    const char* pMessageIdName;
    int32_t messageIdNumber;
    const char* pMessage;
    uint32_t queueLabelCount;
    const VkDebugUtilsLabelEXT* pQueueLabels;
    uint32_t cmdBufLabelCount;
    const VkDebugUtilsLabelEXT* pCmdBufLabels;
    uint32_t objectCount;
    const VkDebugUtilsObjectNameInfoEXT* pObjects;
} VkDebugUtilsMessengerCallbackDataEXT;

• sType is a VkStructureType value identifying this structure.
• pNext is NULL or a pointer to a structure extending this structure.
• flags is 0 and is reserved for future use.
• pMessageIdName is NULL or a null-terminated UTF-8 string that identifies the particular message ID that is associated with the provided message. If the message corresponds to a validation layer message, then this string will be the VUID.
• messageIdNumber is the ID number of the triggering message. If the message corresponds to a validation layer message, then this number is an internal hash of the VUID.
• pMessage is NULL if messageTypes is equal to VK_DEBUG_UTILS_MESSAGE_TYPE_DEVICE_ADDRESS_BINDING_BIT_EXT, or a null-terminated UTF-8 string detailing the trigger conditions. If the message corresponds to a validation layer message, then this will contain the main message with the specification text and link.
• queueLabelCount is a count of items contained in the pQueueLabels array.
• pQueueLabels is NULL or a pointer to an array of VkDebugUtilsLabelEXT active in the current VkQueue at the time the callback was triggered. Refer to Queue Labels for more information.
• cmdBufLabelCount is a count of items contained in the pCmdBufLabels array.
• pCmdBufLabels is NULL or a pointer to an array of VkDebugUtilsLabelEXT active in the current VkCommandBuffer at the time the callback was triggered. Refer to Command Buffer Labels for more information.
• objectCount is a count of items contained in the pObjects array.
• pObjects is a pointer to an array of VkDebugUtilsObjectNameInfoEXT objects related to the detected issue. The array is roughly in order or importance, but the 0th element is always guaranteed to be the most important object for this message.

Since adding queue and command buffer labels behaves like pushing and popping onto a stack, the order of both pQueueLabels and pCmdBufLabels is based on the order the labels were defined. The result is that the first label in either pQueueLabels or pCmdBufLabels will be the first defined (and therefore the oldest) while the last label in each list will be the most recent.