Clarify xrEnumerateInstanceExtensionProperties for API layers #490
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Per https://registry.khronos.org/OpenXR/specs/1.1/html/xrspec.html#api-initialization , this function *can* be called before calling `xrCreateInstance`. > This function may: be called before an instance has been created; implementations must: not assume an instance exists. Concretely, a bug in past versions of the Ultraleap API layer crashed if an instance had not been created.
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Related docs PR: KhronosGroup/OpenXR-Docs#173 |
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An issue (number 2327) has been filed to correspond to this pull request in the internal Khronos GitLab (Khronos members only: KHR:openxr/openxr#2327 ), to facilitate working group processes. This GitHub pull request will continue to be the main site of discussion. |
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I think this is a good clarification. I'd be happy for this to be merged. |
fredemmott
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…them If unavailable, should fail with XR_ERROR_EXTENSION_NOT_PRESENT, which can then be handled, and retried. We can't actually reliably check if it's available by any other mechanism given the varied quality of implementations of xrEnumerateInstanceExtensionProperties, and the current spec wording - KhronosGroup/OpenXR-SDK-Source#490
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Per https://registry.khronos.org/OpenXR/specs/1.1/html/xrspec.html#api-initialization , this function can be called before calling
xrCreateInstance.Concretely, a bug in past versions of the Ultraleap API layer crashed if an instance had not been created.