PFN_vkDebugUtilsMessengerCallbackEXT

The prototype for the VkDebugUtilsMessengerCreateInfoEXT::pfnUserCallback function implemented by the application is:

typedef VkBool32 (VKAPI_PTR *PFN_vkDebugUtilsMessengerCallbackEXT)(
    VkDebugUtilsMessageSeverityFlagBitsEXT           messageSeverity,
    VkDebugUtilsMessageTypeFlagsEXT                  messageTypes,
    const VkDebugUtilsMessengerCallbackDataEXT*      pCallbackData,
    void*                                            pUserData);

• messageSeverity specifies the VkDebugUtilsMessageSeverityFlagBitsEXT that triggered this callback.
• messageTypes is a bitmask of VkDebugUtilsMessageTypeFlagBitsEXT specifying which type of event(s) triggered this callback.
• pCallbackData contains all the callback related data in the VkDebugUtilsMessengerCallbackDataEXT structure.
• pUserData is the user data provided when the VkDebugUtilsMessengerEXT was created.

The callback returns a VkBool32, which is interpreted in a layer-specified manner. The application should always return VK_FALSE. The VK_TRUE value is reserved for use in layer development.