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Initialize projection view pose

Autumn Ashton requested to merge frog/xrgears:fix-pose-quat into master

Fixes xrgears failing due to xrEndFrame returning XR_ERROR_POSE_INVALID under SteamVR.

The OpenXR specification states: "A runtime must return XR_ERROR_POSE_INVALID if the orientation norm deviates by more than 1% from unit length."

Having a quaternion initialized to (0, 0, 0, 0) does not satisfy this requirement.

Signed-off-by: Joshua Ashton joshua@froggi.es

Edited by Autumn Ashton

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