The compositor now moves immediately to visible/focused when polling.
The state tracker will generate relevant openxr state changes once the session is synchronized.
Properly working alternative to e03ee48dce (reverted in e7643de8db)
The application synchronizes its frame loop by "by calling xrWaitFrame,
xrBeginFrame and xrEndFrame in a loop."
Applications can discard frames by not calling xrEndFrame. If initial
frames are discarded, we should not consider the frame loop synchronized.
Previously a sequence like
xrBeginFrame, xrWaitFrame, xrBeginFrame, xrWaitFrame, xrPollEvent, xrBeginFrame
failed because xrPollEvent the compositor emitted transitions to visible
and focused but they were not emitted in the state tracker, because the
oxr session had not internally tranisitioned to the synchronized state.
Also makes the service feature not depend on other options:
it can be used without those other parts.
comp/window_android: Remove unused EGL code for now, as it is crashing.
comp/window_android: Use MonadoView async method to create surface.
comp/window_android: Use custom surface as intended
Co-authored-by: Lubosz Sarnecki <lubosz.sarnecki@collabora.com>
Use none shader when XRT_DISTORTION_MODEL_NONE is set.
Fall back to none distortion if mesh generation fails or unsupported
distortion model is set.
comp_render init updates comp_settings::distortion_model.
u_compute_distortion_mesh: Don't touch xdev::distortion::preferred,
just add XRT_DISTORTION_MODEL_MESHUV mesh to xdev::distortion::models.
Each HMD driver now has to implement compute_distortion() which will be called
by the compositor implementation to generate a mesh (usually).
u_distortion_mesh contains implementations for the defaults (panotools, OpenHMD, vive).
Also adds compute_distortion function for Vive distortion
There are differences between OpenHMD and Panotools values, main differences for now:
* psvr has 5 pano coefficients, ohmd has 3
* psvr uses viewport size and lens center in pixels for distortion calculation, ohmd in meter
* psvr uses different distortion scaling than ohmd
It was left in as a debug measure, but is more confusing than useful,
especially with northstar directly generating a mesh and vive with its own shader.
