Spec clarification: sampleTime on XrFacialExpressionsHTC

[galister]

The spec for XrFacialExpressionsHTC states:

XrFacialExpressionsHTC returns data of a lip facial expression or an eye facial expression.

I would think that this means that all of the fields are set by the runtime.

However, some applications I've seen are actually setting the sampleTime field to XrFrameState::predictedDisplayTime before passing XrFacialExpressionsHTC to the xrGetFacialExpressionsHTC call.

The only information about sampleTime in the spec is:

sampleTime when in time the expression is expressed.

Please clarify if sampleTime is to be set by the runtime or the application.

[rpavlik-bot]

An issue (number 2371) has been filed to correspond to this issue in the internal Khronos GitLab (Khronos members only: KHR:openxr/openxr#2371 ), to facilitate working group processes.

This GitHub issue will continue to be the main site of discussion.

[rpavlik]

I've reached out to a contact to clarify this.