Clarification regarding externalMemoryFeatures returned by vkGetPhysicalDeviceExternalBufferProperties

[physics-enthusiast]

In a similar vein to the guarantees provided by vkGetDeviceBufferMemoryRequirements, if usage1 and usage2 of type VkBufferUsageFlags are such that the bits set in usage2 are a subset of the bits set in usage1, and they are passed as pExternalBufferInfo->flags to vkGetPhysicalDeviceExternalBufferProperties, assuming all else is identical, is it guaranteed that the pExternalBufferProperties->externalMemoryProperties.externalMemoryFeatures of the latter is a superset of the former? In other words, can an application assume that adding usage bits will not suddenly make it possible to back a buffer with exportable/importable external memory (where it couldn't be before)?

[oddhack]

@cubanismo I think? this is a SI TSG issue, yes?

[cubanismo]

TSG Discussion: Leaving opening to allow time for further implementation research and feedback.