171 lines
5.8 KiB
Plaintext
171 lines
5.8 KiB
Plaintext
[[VK_EXT_debug_report]]
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== VK_EXT_debug_report
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*Name String*::
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+VK_EXT_debug_report+
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*Extension Type*::
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Instance
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*Registered Extension Number*::
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12
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*Last Modified Date*::
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2016-12-08
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*Revision*::
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4
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*IP Status*::
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No known IP claims.
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*Dependencies*::
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- This extension is written against version 1.0.27 of the Vulkan API.
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*Contributors*::
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- Courtney Goeltzenleuchter, LunarG
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- Dan Ginsburg, Valve
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- Jon Ashburn, LunarG
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- Mark Lobodzinski, LunarG
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*Contacts*::
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- Courtney Goeltzenleuchter
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Due to the nature of the Vulkan interface, there is very little error
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information available to the developer and application.
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By enabling optional validation layers and using the +VK_EXT_debug_report+
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extension, developers can: obtain much more detailed feedback on the
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application's use of Vulkan.
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This extension define a way for layers and the implementation to call back
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to the application for events of interest to the application.
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=== New Object Types
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* slink:VkDebugReportCallbackCreateInfoEXT
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=== New Enum Constants
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* Extending elink:VkStructureType:
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** ename:VK_STRUCTURE_TYPE_DEBUG_REPORT_CALLBACK_CREATE_INFO_EXT
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* Extending elink:VkResult:
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** ename:VK_ERROR_VALIDATION_FAILED_EXT
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=== New Enums
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* elink:VkDebugReportFlagBitsEXT
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* elink:VkDebugReportObjectTypeEXT
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* elink:VkDebugReportErrorEXT
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=== New Structures
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* slink:VkDebugReportCallbackCreateInfoEXT
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=== New Functions
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* flink:vkCreateDebugReportCallbackEXT
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* flink:vkDestroyDebugReportCallbackEXT
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* flink:vkDebugReportMessageEXT
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=== New Function Pointers
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* tlink:PFN_vkDebugReportCallbackEXT
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=== Examples
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+VK_EXT_debug_report+ allows an application to register multiple callbacks
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with the validation layers.
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Some callbacks may log the information to a file, others may cause a debug
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break point or other application defined behavior.
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An application can register callbacks even when no validation layers are
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enabled, but they will only be called for loader and, if implemented, driver
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events.
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To capture issues found while creating or destroying an instance an
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application can link a slink:VkDebugReportCallbackCreateInfoEXT structure to
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the pname:pNext element of the slink:VkInstanceCreateInfo structure given to
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flink:vkCreateInstance.
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This callback is only valid for the duration of the flink:vkCreateInstance
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and the flink:vkDestroyInstance call.
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Use flink:vkCreateDebugReportCallbackEXT to create persistent callback
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objects.
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Example uses: Create three callback objects.
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One will log errors and warnings to the debug console using Windows
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code:OutputDebugString.
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The second will cause the debugger to break at that callback when an error
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happens and the third will log warnings to stdout.
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[source,{basebackend@docbook:c++:cpp}]
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------------------------------------------------------------------------------
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VkResult res;
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VkDebugReportCallbackEXT cb1, cb2, cb3;
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VkDebugReportCallbackCreateInfoEXT callback1 = {
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VK_STRUCTURE_TYPE_DEBUG_REPORT_CALLBACK_CREATE_INFO_EXT, // sType
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NULL, // pNext
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VK_DEBUG_REPORT_ERROR_BIT_EXT | // flags
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VK_DEBUG_REPORT_WARNING_BIT_EXT,
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myOutputDebugString, // pfnCallback
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NULL // pUserData
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};
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res = vkCreateDebugReportCallbackEXT(instance, &callback1, &cb1);
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if (res != VK_SUCCESS)
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/* Do error handling for VK_ERROR_OUT_OF_MEMORY */
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callback.flags = VK_DEBUG_REPORT_ERROR_BIT_EXT;
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callback.pfnCallback = myDebugBreak;
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callback.pUserData = NULL;
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res = vkCreateDebugReportCallbackEXT(instance, &callback, &cb2);
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if (res != VK_SUCCESS)
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/* Do error handling for VK_ERROR_OUT_OF_MEMORY */
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VkDebugReportCallbackCreateInfoEXT callback3 = {
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VK_STRUCTURE_TYPE_DEBUG_REPORT_CALLBACK_CREATE_INFO_EXT, // sType
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NULL, // pNext
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VK_DEBUG_REPORT_WARNING_BIT_EXT, // flags
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mystdOutLogger, // pfnCallback
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NULL // pUserData
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};
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res = vkCreateDebugReportCallbackEXT(instance, &callback3, &cb3);
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if (res != VK_SUCCESS)
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/* Do error handling for VK_ERROR_OUT_OF_MEMORY */
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...
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/* remove callbacks when cleaning up */
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vkDestroyDebugReportCallbackEXT(instance, cb1);
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vkDestroyDebugReportCallbackEXT(instance, cb2);
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vkDestroyDebugReportCallbackEXT(instance, cb3);
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------------------------------------------------------------------------------
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[NOTE]
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.Note
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====
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In the initial release of the +VK_EXT_debug_report+ extension, the token
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ename:VK_STRUCTURE_TYPE_DEBUG_REPORT_CREATE_INFO_EXT was used.
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Starting in version 2 of the extension branch,
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ename:VK_STRUCTURE_TYPE_DEBUG_REPORT_CALLBACK_CREATE_INFO_EXT is used
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instead for consistency with Vulkan naming rules.
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The older enum is still available for backwards compatibility.
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====
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=== Issues
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[NOTE]
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.Note
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====
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There are no issues in the current spec.
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We should probably add some.
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====
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=== Version History
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* Revision 1, 2015-05-20 (Courtney Goetzenleuchter)
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- Initial draft, based on LunarG KHR spec, other KHR specs
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* Revision 2, 2016-02-16 (Courtney Goetzenleuchter)
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- Update usage, documentation
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* Revision 3, 2016-06-14 (Courtney Goetzenleuchter)
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- Update VK_EXT_DEBUG_REPORT_SPEC_VERSION to indicate added support for
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vkCreateInstance and vkDestroyInstance
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* Revision 4, 2016-12-08 (Mark Lobodzinski)
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- Added Display_KHR, DisplayModeKHR extension objects
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- Added ObjectTable_NVX, IndirectCommandsLayout_NVX extension objects
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- Bumped spec revision
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- Retroactively added version history
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