// This section is included inside the Debugging chapter (debugging.txt) [[debugging-debug-report-callbacks]] == Debug Report Callbacks // refBegin VkDebugReportCallbackEXT Opaque handle to a debug report callback object Debug report callbacks are represented by sname:VkDebugReportCallbackEXT handles: include::../api/handles/VkDebugReportCallbackEXT.txt[] // refEnd VkDebugReportCallbackEXT // refBegin vkCreateDebugReportCallbackEXT Create a debug report callback object Debug report callbacks give more detailed feedback on the application's use of Vulkan when events of interest occur. To register a debug report callback, an application uses flink:vkCreateDebugReportCallbackEXT. include::../api/protos/vkCreateDebugReportCallbackEXT.txt[] * pname:instance the instance the callback will be logged on. * pname:pCreateInfo points to a slink:VkDebugReportCallbackCreateInfoEXT structure which defines the conditions under which this callback will be called. * pname:pAllocator controls host memory allocation as described in the <> chapter. * pname:pCallback is a pointer to record the sname:VkDebugReportCallbackEXT object created. include::../validity/protos/vkCreateDebugReportCallbackEXT.txt[] // refBegin VkDebugReportCallbackCreateInfoEXT Structure specifying parameters of a newly created debug report callback The definition of slink:VkDebugReportCallbackCreateInfoEXT is: include::../api/structs/VkDebugReportCallbackCreateInfoEXT.txt[] * pname:sType is the type of this structure. * pname:pNext is `NULL` or a pointer to an extension-specific structure. * pname:flags indicate which event(s) will cause this callback to be called. Flags are interpreted as bitmasks and multiple can: be set. Bits which can: be set include: + -- // refBegin VkDebugReportFlagBitsEXT Bitmask specifying events which cause a debug report callback include::../api/enums/VkDebugReportFlagBitsEXT.txt[] ** ename:VK_DEBUG_REPORT_ERROR_BIT_EXT indicates an error that may cause undefined results, including an application crash. ** ename:VK_DEBUG_REPORT_WARNING_BIT_EXT indicates use of Vulkan that may expose an app bug. Such cases may not be immediately harmful, such as a fragment shader outputting to a location with no attachment. Other cases may point to behavior that is almost certainly bad when unintended such as using an image whose memory has not been filled. In general if you see a warning but you know that the behavior is intended/desired, then simply ignore the warning. ** ename:VK_DEBUG_REPORT_PERFORMANCE_WARNING_BIT_EXT indicates a potentially non-optimal use of Vulkan, e.g. using flink:vkCmdClearColorImage when setting slink:VkAttachmentDescription::pname:loadOp to ename:VK_ATTACHMENT_LOAD_OP_CLEAR would have worked. ** ename:VK_DEBUG_REPORT_INFORMATION_BIT_EXT indicates an informational message such as resource details that may be handy when debugging an application. ** ename:VK_DEBUG_REPORT_DEBUG_BIT_EXT indicates diagnostic information from the implementation and layers. -- * pname:pfnCallback is the application callback function to call. * pname:pUserData is user data to be passed to the callback. For each sname:VkDebugReportCallbackEXT that is created the sname:VkDebugReportCallbackCreateInfoEXT::pname:flags determine when that sname:VkDebugReportCallbackCreateInfoEXT::pname:pfnCallback is called. When an event happens, the implementation will do a bitwise AND of the event's ename:VkDebugReportFlagBitsEXT flags to each sname:VkDebugReportCallbackEXT object's flags. For each non-zero result the corresponding callback will be called. The callback will come directly from the component that detected the event, unless some other layer intercepts the calls for its own purposes (filter them in a different way, log to a system error log, etc.). An application may: receive multiple callbacks if multiple sname:VkDebugReportCallbackEXT objects were created. A callback will always be executed in the same thread as the originating Vulkan call. A callback may be called from multiple threads simultaneously (if the application is making Vulkan calls from multiple threads). .Valid Usage **** * [[VUID-VkDebugReportCallbackCreateInfoEXT-pfnCallback-01385]] pname:pfnCallback must: be a valid tlink:PFN_vkDebugReportCallbackEXT **** include::../validity/structs/VkDebugReportCallbackCreateInfoEXT.txt[] // refBegin PFN_vkDebugReportCallbackEXT Application-defined debug report callback function The prototype for the callback function implemented by the application is: include::../api/funcpointers/PFN_vkDebugReportCallbackEXT.txt[] * pname:flags indicates the ename:VkDebugReportFlagBitsEXT that triggered this callback. * pname:objectType is a elink:VkDebugReportObjectTypeEXT specifying the type of object being used or created at the time the event was triggered. * pname:object is the object where the issue was detected. If pname:objectType is VK_DEBUG_REPORT_OBJECT_TYPE_UNKNOWN_EXT pname:object is undefined. * pname:location is a component (layer, driver, loader) defined value that indicates the _location_ of the trigger. This is an optional value. * pname:messageCode is a layer-defined value indicating what test triggered this callback. * pname:pLayerPrefix is a null-terminated string that is an abbreviation of the name of the component making the callback. pname:pLayerPrefix is only valid for the duration of the callback. * pname:pMessage is a null-terminated string detailing the trigger conditions. pname:pMessage is only valid for the duration of the callback. * pname:pUserData is the user data given when the sname:VkDebugReportCallbackEXT was created. The callback must: not call fname:vkDestroyDebugReportCallbackEXT. The callback returns a basetype:VkBool32 that indicates to the calling layer the application's desire to abort the call. A value of ename:VK_TRUE indicates that the application wants to abort this call. If the application returns ename:VK_FALSE, the command must: not be aborted. Applications should: always return ename:VK_FALSE so that they see the same behavior with and without validation layers enabled. If the application returns ename:VK_TRUE from its callback and the Vulkan call being aborted returns a elink:VkResult, the layer will return ename:VK_ERROR_VALIDATION_FAILED_EXT. // refBegin VkDebugReportObjectTypeEXT Specify the type of an object handle The object types are: include::../api/enums/VkDebugReportObjectTypeEXT.txt[] * ename:VK_DEBUG_REPORT_OBJECT_TYPE_UNKNOWN_EXT is an unknown object. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_INSTANCE_EXT is a sname:VkInstance. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_PHYSICAL_DEVICE_EXT is a sname:VkPhysicalDevice. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_DEVICE_EXT is a sname:VkDevice. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_QUEUE_EXT is a sname:VkQueue. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_SEMAPHORE_EXT is a sname:VkSemaphore. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_COMMAND_BUFFER_EXT is a sname:VkCommandBuffer. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_FENCE_EXT is a sname:VkFence. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_DEVICE_MEMORY_EXT is a sname:VkDeviceMemory. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_BUFFER_EXT is a sname:VkBuffer. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_IMAGE_EXT is a sname:VkImage. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_EVENT_EXT is a sname:VkEvent. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_QUERY_POOL_EXT is a sname:VkQueryPool. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_BUFFER_VIEW_EXT is a sname:VkBufferView. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_IMAGE_VIEW_EXT is a sname:VkImageView. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_SHADER_MODULE_EXT is a sname:VkShaderModule. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_PIPELINE_CACHE_EXT is a sname:VkPipelineCache. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_PIPELINE_LAYOUT_EXT is a sname:VkPipelineLayout. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_RENDER_PASS_EXT is a sname:VkRenderPass. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_PIPELINE_EXT is a sname:VkPipeline. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_DESCRIPTOR_SET_LAYOUT_EXT is a sname:VkDescriptorSetLayout. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_SAMPLER_EXT is a sname:VkSampler. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_DESCRIPTOR_POOL_EXT is a sname:VkDescriptorPool. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_DESCRIPTOR_SET_EXT is a sname:VkDescriptorSet. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_FRAMEBUFFER_EXT is a sname:VkFramebuffer. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_COMMAND_POOL_EXT is a sname:VkCommandPool. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_SURFACE_KHR_EXT is a sname:VkSurfaceKHR. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_SWAPCHAIN_KHR_EXT is a sname:VkSwapchainKHR. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_DEBUG_REPORT_CALLBACK_EXT_EXT is a sname:VkDebugReportCallbackEXT. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_DISPLAY_KHR_EXT is a sname:VkDisplayKHR. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_DISPLAY_MODE_KHR_EXT is a sname:VkDisplayModeKHR. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_OBJECT_TABLE_NVX_EXT is a sname:VkObjectTableNVX. * ename:VK_DEBUG_REPORT_OBJECT_TYPE_INDIRECT_COMMANDS_LAYOUT_NVX_EXT is a sname:VkIndirectCommandsLayoutNVX. ifdef::VK_KHR_descriptor_update_template[] * ename:VK_DEBUG_REPORT_OBJECT_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_KHR_EXT is a sname:VkDescriptorUpdateTemplateKHR. endif::VK_KHR_descriptor_update_template[] [NOTE] .Note ==== The primary expected use of ename:VK_ERROR_VALIDATION_FAILED_EXT is for validation layer testing. It is not expected that an application would see this error code during normal use of the validation layers. ==== // refEnd PFN_vkDebugReportCallbackEXT // vkDebugReportMessageEXT Inject a message into a debug stream To inject its own messages into the debug stream, call: include::../api/protos/vkDebugReportMessageEXT.txt[] * pname:instance is the debug stream's sname:VkInstance. * pname:flags indicates the ename:VkDebugReportFlagBitsEXT classification of this event/message. * pname:objectType is a elink:VkDebugReportObjectTypeEXT specifying the type of object being used or created at the time the event was triggered. * pname:object this is the object where the issue was detected. pname:object can: be ename:VK_NULL_HANDLE if there is no object associated with the event. * pname:location is an application defined value. * pname:messageCode is an application defined value. * pname:pLayerPrefix is the abbreviation of the component making this event/message. * pname:pMessage is a null-terminated string detailing the trigger conditions. The call will propagate through the layers and generate callback(s) as indicated by the message's flags. The parameters are passed on to the callback in addition to the pname:pUserData value that was defined at the time the callback was registered. .Valid Usage **** * [[VUID-vkDebugReportMessageEXT-object-01241]] pname:object must: be a Vulkan object or ename:VK_NULL_HANDLE **** include::../validity/protos/vkDebugReportMessageEXT.txt[] // refBegin vkDestroyDebugReportCallbackEXT Destroy a debug report callback object To destroy a sname:VkDebugReportCallbackEXT object, call: include::../api/protos/vkDestroyDebugReportCallbackEXT.txt[] * pname:instance the instance where the callback was created. * pname:callback the sname:VkDebugReportCallbackEXT object to destroy. pname:callback is an externally synchronized object and must: not be used on more than one thread at a time. This means that fname:vkDestroyDebugReportCallbackEXT must: not be called when a callback is active. * pname:pAllocator controls host memory allocation as described in the <> chapter. .Valid Usage **** * [[VUID-vkDestroyDebugReportCallbackEXT-instance-01242]] If sname:VkAllocationCallbacks were provided when pname:callback was created, a compatible set of callbacks must: be provided here * [[VUID-vkDestroyDebugReportCallbackEXT-instance-01243]] If no sname:VkAllocationCallbacks were provided when pname:callback was created, pname:pAllocator must: be `NULL` **** include::../validity/protos/vkDestroyDebugReportCallbackEXT.txt[]