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Clarify xrEnumerateInstanceExtensionProperties for API layers #490

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Clarify xrEnumerateInstanceExtensionProperties for API layers #490

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7 changes: 5 additions & 2 deletions specification/loader/api_layer.adoc
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Expand Up @@ -692,8 +692,11 @@ Therefore, it must follow some conventions and rules defined below:
contents of the instance extensions it supports.
** If "layerName" is NULL and:
*** It is an explicit API layer, it must: not fill in any data.
*** It is an implicit API layer, it must: add it's own instance extension
contents to the list of extensions.
*** It is an implicit API layer and:
**** an `XrInstance` has been created but not destroyed, it must: add its own
instance extension contents to the list of extensions.
**** no `XrInstance` has been created, or all have been destroyed, it must:
return only its own instance extension contents.
* For any OpenXR command the API layer intercepts, `xrGetInstanceProcAddr`
must: return a pointer to a local entry point.
** Otherwise it returns the value obtained by calling down the instance call
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