[OpenXR] Fix LOCAL_FLOOR
emulation on HTC Vive XR Elite
#93678
Merged
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Fixes #93647
The main change here, is just that we wait until the next frame to measure the floor height. However, I also took the opportunity to refactor and clean up the
LOCAL_FLOOR
emulation code a little bit.(Unlike I previously hypothesized, we'd didn't break the
LOCAL_FLOOR
emulation - it still worked for me on Meta Quest when hard-coding it to use the emulation. The HTC Vive XR Elite just needs to wait a frame, whereas the Quest doesn't.)