C Specification

// Provided by XR_EXT_eye_gaze_interaction
typedef struct XrEyeGazeSampleTimeEXT {
    XrStructureType    type;
    void*              next;
    XrTime             time;
} XrEyeGazeSampleTimeEXT;

Members

Member Descriptions

  • type is the XrStructureType of this structure.

  • next is NULL or a pointer to the next structure in a structure chain. No such structures are defined in core OpenXR or this extension.

  • time is when in time the eye gaze pose is expressed.

Description

One particularity for eye trackers compared to most other spatial input is that the runtime may lack the capability to predict or interpolate eye gaze poses. Runtimes that are unable to predict or interpolate eye gaze poses must clamp the gaze pose requested in the xrLocateSpace call to the value nearest to time requested in the call. To allow for an application to reason about high accuracy eye tracking, the application can chain in an XrEyeGazeSampleTimeEXT to the next pointer of the XrSpaceLocation structure passed into the xrLocateSpace call. The runtime must set time in the XrEyeGazeSampleTimeEXT structure to the clamped, predicted, or interpolated time. The application should inspect the XrEyeGazeSampleTimeEXT::time field to understand when in time the pose is expressed. The time field may be in the future if a runtime is able to predict gaze poses. The runtime must set the time field to 0 if the sample time is not available.

Valid Usage (Implicit)

See Also

XR_EXT_eye_gaze_interaction, XrStructureType, XrTime

Document Notes

For more information, see the OpenXR Specification

This page is extracted from the OpenXR Specification. Fixes and changes should be made to the Specification, not directly.

Copyright

Copyright 2014-2026 The Khronos Group Inc.

This work is licensed under a Creative Commons Attribution 4.0 International License.