vkGetInstanceProcAddr get device extension dispathcable command that extension must been enabled

[FuXiii]

In my system case, if I didn't enabled device extension, but fetch function pointer directly, it will return NULL .

I think we had better add the limilt about enabled device extension .

✧(≖ ◡ ≖)

[TomOlson]

@FuXiii we don't understand what you are trying to fix. Could you post exactly what entry point you called with what parameters, and tell us what result you got and why it is not what you expected?

[FuXiii]

I means, before we get device extension dispatchable command for instance, should we must enabled it?

[r-potter]

As long as at least one physical device supports the required extension, you can call vkGetInstanceProcAddr to retrieve a device extension dispatchable command, and you should get a non-null result back.

You can do this before you have even created a VkDevice, which implies that the device extension does not need to have been enabled. However, for non-physical device level functions (i.e. anything that takes VkDevice or any of it's children) you will need to enable the device extension before actually calling the returned function.

If you are not seeing this behaviour (i.e. you are getting NULL) then this likely implies a bug. This may be a driver/loader issue, or may be because you don't have any physical devices that support the specific extension.

[FuXiii]

Is that means: I can use vkGetInstanceProcAddr to load any device extension dispatchable command that physical device support support, in this case I just can load them but can not calling them. If I want calling them I must need enabled relevant device extension.

[r-potter]

That is correct, yes.

[FuXiii]

Ok, thank you very much.