// This section is included inside the Debugging chapter (debugging.txt) [[debugging-debug-report-callbacks]] == Debug Report Callbacks [open,refpage='VkDebugReportCallbackEXT',desc='Opaque handle to a debug report callback object',type='handles'] -- Debug report callbacks are represented by sname:VkDebugReportCallbackEXT handles: include::../api/handles/VkDebugReportCallbackEXT.txt[] -- [open,refpage='vkCreateDebugReportCallbackEXT',desc='Create a debug report callback object',type='protos'] -- 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[] -- [open,refpage='VkDebugReportCallbackCreateInfoEXT',desc='Structure specifying parameters of a newly created debug report callback',type='structs'] -- 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 is a bitmask of elink:VkDebugReportFlagBitsEXT specifying which event(s) will cause this callback to be called. * 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 elink: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[] -- [open,refpage='VkDebugReportFlagBitsEXT',desc='Bitmask specifying events which cause a debug report callback',type='enums'] -- Bits which can: be set in slink:VkDebugReportCallbackCreateInfoEXT::pname:flags, specifying events which cause a debug report, are: include::../api/enums/VkDebugReportFlagBitsEXT.txt[] * ename:VK_DEBUG_REPORT_ERROR_BIT_EXT specifies that an error that may cause undefined results, including an application crash. * ename:VK_DEBUG_REPORT_WARNING_BIT_EXT specifies 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 specifies 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 specifies an informational message such as resource details that may be handy when debugging an application. * ename:VK_DEBUG_REPORT_DEBUG_BIT_EXT specifies diagnostic information from the implementation and layers. -- [open,refpage='PFN_vkDebugReportCallbackEXT',desc='Application-defined debug report callback function',type='funcpointers'] -- The prototype for the slink:VkDebugReportCallbackCreateInfoEXT::pname:pfnCallback function implemented by the application is: include::../api/funcpointers/PFN_vkDebugReportCallbackEXT.txt[] * pname:flags indicates the elink:VkDebugReportFlagBitsEXT that triggered this callback. * pname:objectType is a elink:VkDebugReportObjectTypeEXT value 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 ename: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 slink: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. .Valid Usage **** * [[VUID-VkDebugReportCallbackCreateInfoEXT-object-01496]] pname:object must: be a Vulkan object or ename:VK_NULL_HANDLE. * [[VUID-VkDebugReportCallbackCreateInfoEXT-objectType-01497]] If pname:objectType is not ename:VK_DEBUG_REPORT_OBJECT_TYPE_UNKNOWN_EXT and pname:object is not ename:VK_NULL_HANDLE, pname:object must: be a Vulkan object of the corresponding type associated with pname:objectType as defined in <>. **** -- [open,refpage='VkDebugReportObjectTypeEXT',desc='Specify the type of an object handle',type='enums'] -- Possible values passed to the pname:objectType parameter of the callback function specified by slink:VkDebugReportCallbackCreateInfoEXT::pname:pfnCallback, specifying the type of object handle being reported, are: include::../api/enums/VkDebugReportObjectTypeEXT.txt[] [[debug-report-object-types]] .VkDebugReportObjectTypeEXT and Vulkan Handle Relationship [width="80%",cols="<35,<23",options="header"] |==== | elink:VkDebugReportObjectTypeEXT | Vulkan Handle Type | ename:VK_DEBUG_REPORT_OBJECT_TYPE_UNKNOWN_EXT | Unknown/Undefined Handle | ename:VK_DEBUG_REPORT_OBJECT_TYPE_INSTANCE_EXT | slink:VkInstance | ename:VK_DEBUG_REPORT_OBJECT_TYPE_PHYSICAL_DEVICE_EXT | slink:VkPhysicalDevice | ename:VK_DEBUG_REPORT_OBJECT_TYPE_DEVICE_EXT | slink:VkDevice | ename:VK_DEBUG_REPORT_OBJECT_TYPE_QUEUE_EXT | slink:VkQueue | ename:VK_DEBUG_REPORT_OBJECT_TYPE_SEMAPHORE_EXT | slink:VkSemaphore | ename:VK_DEBUG_REPORT_OBJECT_TYPE_COMMAND_BUFFER_EXT | slink:VkCommandBuffer | ename:VK_DEBUG_REPORT_OBJECT_TYPE_FENCE_EXT | slink:VkFence | ename:VK_DEBUG_REPORT_OBJECT_TYPE_DEVICE_MEMORY_EXT | slink:VkDeviceMemory | ename:VK_DEBUG_REPORT_OBJECT_TYPE_BUFFER_EXT | slink:VkBuffer | ename:VK_DEBUG_REPORT_OBJECT_TYPE_IMAGE_EXT | slink:VkImage | ename:VK_DEBUG_REPORT_OBJECT_TYPE_EVENT_EXT | slink:VkEvent | ename:VK_DEBUG_REPORT_OBJECT_TYPE_QUERY_POOL_EXT | slink:VkQueryPool | ename:VK_DEBUG_REPORT_OBJECT_TYPE_BUFFER_VIEW_EXT | slink:VkBufferView | ename:VK_DEBUG_REPORT_OBJECT_TYPE_IMAGE_VIEW_EXT | slink:VkImageView | ename:VK_DEBUG_REPORT_OBJECT_TYPE_SHADER_MODULE_EXT | slink:VkShaderModule | ename:VK_DEBUG_REPORT_OBJECT_TYPE_PIPELINE_CACHE_EXT | slink:VkPipelineCache | ename:VK_DEBUG_REPORT_OBJECT_TYPE_PIPELINE_LAYOUT_EXT | slink:VkPipelineLayout | ename:VK_DEBUG_REPORT_OBJECT_TYPE_RENDER_PASS_EXT | slink:VkRenderPass | ename:VK_DEBUG_REPORT_OBJECT_TYPE_PIPELINE_EXT | slink:VkPipeline | ename:VK_DEBUG_REPORT_OBJECT_TYPE_DESCRIPTOR_SET_LAYOUT_EXT | slink:VkDescriptorSetLayout | ename:VK_DEBUG_REPORT_OBJECT_TYPE_SAMPLER_EXT | slink:VkSampler | ename:VK_DEBUG_REPORT_OBJECT_TYPE_DESCRIPTOR_POOL_EXT | slink:VkDescriptorPool | ename:VK_DEBUG_REPORT_OBJECT_TYPE_DESCRIPTOR_SET_EXT | slink:VkDescriptorSet | ename:VK_DEBUG_REPORT_OBJECT_TYPE_FRAMEBUFFER_EXT | slink:VkFramebuffer | ename:VK_DEBUG_REPORT_OBJECT_TYPE_COMMAND_POOL_EXT | slink:VkCommandPool ifdef::VK_KHR_surface[] | ename:VK_DEBUG_REPORT_OBJECT_TYPE_SURFACE_KHR_EXT | slink:VkSurfaceKHR endif::VK_KHR_surface[] ifdef::VK_KHR_surface[] | ename:VK_DEBUG_REPORT_OBJECT_TYPE_SWAPCHAIN_KHR_EXT | slink:VkSwapchainKHR endif::VK_KHR_surface[] | ename:VK_DEBUG_REPORT_OBJECT_TYPE_DEBUG_REPORT_CALLBACK_EXT_EXT | slink:VkDebugReportCallbackEXT ifdef::VK_KHR_display[] | ename:VK_DEBUG_REPORT_OBJECT_TYPE_DISPLAY_KHR_EXT | slink:VkDisplayKHR | ename:VK_DEBUG_REPORT_OBJECT_TYPE_DISPLAY_MODE_KHR_EXT | slink:VkDisplayModeKHR endif::VK_KHR_display[] ifdef::VK_NVX_device_generated_commands[] | ename:VK_DEBUG_REPORT_OBJECT_TYPE_OBJECT_TABLE_NVX_EXT | slink:VkObjectTableNVX | ename:VK_DEBUG_REPORT_OBJECT_TYPE_INDIRECT_COMMANDS_LAYOUT_NVX_EXT | slink:VkIndirectCommandsLayoutNVX endif::VK_NVX_device_generated_commands[] ifdef::VK_KHR_descriptor_update_template[] | ename:VK_DEBUG_REPORT_OBJECT_TYPE_DESCRIPTOR_UPDATE_TEMPLATE_KHR_EXT | slink: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. ==== -- [open,refpage='vkDebugReportMessageEXT',desc='Inject a message into a debug stream',type='protos'] -- 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 elink: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 * [[VUID-vkDebugReportMessageEXT-objectType-01498]] If pname:objectType is not ename:VK_DEBUG_REPORT_OBJECT_TYPE_UNKNOWN_EXT and pname:object is not ename:VK_NULL_HANDLE, pname:object must: be a Vulkan object of the corresponding type associated with pname:objectType as defined in <>. **** include::../validity/protos/vkDebugReportMessageEXT.txt[] -- [open,refpage='vkDestroyDebugReportCallbackEXT',desc='Destroy a debug report callback object',type='protos'] -- 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[] --