Pass callbacks to Vulkan API

[courgeon]

Hello.

I'm following a tutorial in Vulkan C++ (I'm new to Vulkan) and I managed to get a Vulkan context open.
I'm now struggling with porting some part of the tutorial :
They're showing how to bind a callback method to the validation layers: (C++)

VkDebugUtilsMessengerCreateInfoEXT createInfo{};
createInfo.sType =VK_STRUCTURE_TYPE_DEBUG_UTILS_MESSENGER_CREATE_INFO_EXT;
createInfo.messageSeverity = VK_DEBUG_UTILS_MESSAGE_SEVERITY_VERBOSE_BIT_EXT |
VK_DEBUG_UTILS_MESSAGE_SEVERITY_WARNING_BIT_EXT |
VK_DEBUG_UTILS_MESSAGE_SEVERITY_ERROR_BIT_EXT;
createInfo.messageType = VK_DEBUG_UTILS_MESSAGE_TYPE_GENERAL_BIT_EXT
| VK_DEBUG_UTILS_MESSAGE_TYPE_VALIDATION_BIT_EXT |
VK_DEBUG_UTILS_MESSAGE_TYPE_PERFORMANCE_BIT_EXT;

Which translate nicely to C#

  DebugUtilsMessengerCreateInfoEXT debuggerInfo = new DebugUtilsMessengerCreateInfoEXT();
  debuggerInfo.SType = StructureType.DebugUtilsMessengerCreateInfoExt;
  debuggerInfo.MessageSeverity = DebugUtilsMessageSeverityFlagsEXT.DebugUtilsMessageSeverityVerboseBitExt |
      DebugUtilsMessageSeverityFlagsEXT.DebugUtilsMessageSeverityWarningBitExt |
      DebugUtilsMessageSeverityFlagsEXT.DebugUtilsMessageSeverityErrorBitExt;
  debuggerInfo.MessageType = DebugUtilsMessageTypeFlagsEXT.DebugUtilsMessageTypeGeneralBitExt |
     DebugUtilsMessageTypeFlagsEXT.DebugUtilsMessageTypeValidationBitExt |
     DebugUtilsMessageTypeFlagsEXT.DebugUtilsMessageTypePerformanceBitExt;

but then, they bind a callback (C++)

createInfo.pfnUserCallback = debugCallback;

debugCallback being declared as a simple C++ method.

But in c#, the attribute is a PfnDebugUtilsMessengerCallbackEXT, and I can't figure out how I'm supposed to send a method through that. There is a constructor that takes a " delegate * unmanaged[Cdecl]< TYPES... >ptr "
How do a convert a static method to this ?

Anyone with some experience of this ?

Thanks for your help !

Matt

[Perksey]

Try

createInfo.PfnUserCallback = (DebugUtilsMessengerCallbackFunctionEXT) DebugCallback;

DebugUtilsMessengerCallbackFunctionEXT is a delegate which implicitly casts to the Pfn type.

[courgeon]

Quick answer, thanks :)

The compiler says "No overload for "DebugCallback" matches delegate 'DebugUtilsMessengerCallbackFunctionEXT'
Where DebugCallback is a public static method.

[courgeon]

nevermind, the method declaration was mistyped. It does work

[courgeon]

Thanks you !