Crash in vkGetPhysicalDeviceSurfaceCapabilitiesKHR, no validation messages

[rnikander]

I'm just getting started with this, getting "hello triangle" to deploy and run on various devices. On macOS it works, but on an iOS device, I get part way through initialization, but then Xcode reports: Thread 1: EXC_BAD_ACCESS (code=1, address=0x41a1f622da11) when I call:

vkGetPhysicalDeviceSurfaceCapabilitiesKHR(device, m_surface, &details.capabilities);

I can see from the stack it's somewhere in...

MVKPhysicalDevice::getSurfaceCapabilities(VkPhysicalDeviceSurfaceInfo2KHR const*, VkSurfaceCapabilities2KHR*)

But it shows me only machine code.

I guess the next step could be to build MoltenVK so I have a debuggable version of the library and can see what line it's crashing on?

Any other suggestions?

[billhollings]

I'm not able to replicate this with the Cube demo in MoltenVK. And the code for vkGetPhysicalDeviceSurfaceCapabilitiesKHR() is the same for macOS and iOS, so it should behave similar on both platforms.

I assume it must have something to do with the arguments you're passing into the call. Make sure required items are not nullptr.

If you are still having issues, yes, you can build a debug version of MoltenVK to get a full stack trace and report it back here.

[rnikander]

I copied some old sample code and I think I'm using the wrong extension. Let me try the "metal" instead of "iOS" one.

[rnikander]

I changed from calling vkCreateIOSSurfaceMVK to vkCreateMetalSurfaceEXT, and now it works. If the first one is obsolete/dead (?), maybe it should be issuing warnings and not returning VK_SUCCESS?