[hougantc-nvda]

Description

Add an optional OVUI desktop mirror for OVXR sessions. Applications select completed eye/camera products with MirrorProduct, set an update limit and supply status text. The most recent image remains visible between updates; closing the window requests application shutdown.

OwnedDesktopMirror implements the shared OvxrFrameConsumer from #1295. Selection, bounded owned image copies and UI-worker lifetime stay in the mirror component. PiP and mirror are independent; mirrored eyes exclude separately submitted PiP layers, while camera feeds can be selected directly.

The mirror uses OVUI's default Vulkan backend. Neither Isaac Capture nor the matching Lab adapter changes OMNIUI_BACKEND; an active non-Vulkan backend is rejected clearly. Obsolete OpenGL/GLX discovery, swap-interval and cross-device copy code is removed. CUDA completion checks preserve the UI's import device during uploads and teardown.

The optional desktop-mirror extra installs OVUI separately and requires Python 3.12+, CUDA 13 bindings, a compatible NVIDIA driver and a usable GPU-backed desktop. Core Isaac Capture retains Python 3.11 support. Release-wheel validation checks the mirror modules as well as the native PiP helper.

Testing

Linux x86-64, Python 3.12; matching Lab adapter in #8790, inherited by #8791.

• 205 OVXR/consumer tests passed after the ownership refactor; predecessor boundaries passed 81 session/151 teleop tests and 127 PiP tests. The matching Lab adapter/camera suite passed 149 tests against the refactored Python package. Lab passed 149 adapter/camera tests at each affected boundary.
• Before the ownership refactor, real Vulkan window: three GPU1-backed image sequences, exact pixels for both changing colors, clean shutdown. Source/wheel identity, helper/mirror inclusion, 282-package dependency check and pre-commit passed.
• Earlier Vulkan candidate: 1,045 affected Capture tests; GR1T2 CPU and split-GPU fixed-base G1 IWER stereo, PiP, motion, Reset, mirror and shutdown. GR1T2 additionally passed reconnect/resumed motion.
• Warm paired decoded-video medians: GR1T2 OpenGL 45.07 / Vulkan 45.28 fps; G1 31.31 / 31.10 fps. Inter-run variation prevented a consistent slowdown finding. These samples precede the final device-preservation cleanup and are not headset FPS or a fresh final-candidate performance qualification.

Remote release CI, arm64 and a new physical-headset run remain unverified. Cold attach, intermittent first-Play recovery and SO101 cube retention remain open. Local full docs rendering lacks the NVIDIA Sphinx theme; reference checks pass.

Rebased onto main at a0a06c7d: 205 consumer tests and 149 Lab adapter/camera tests passed, along with CI-equivalent pre-commit. The reviewed feature delta is preserved; release validation now retains upstream license/SBOM and finished-wheel import checks before camera/mirror verification and upload. Tests reused existing native binaries; a fresh build against updated upstream, release-wheel CI, and new IWER/headset/performance qualification remain unverified.

Checklist

• I have read and understood the contribution guidelines
• I have run the linter and formatter with SKIP=check-copyright-year pre-commit run --all-files
• I have made corresponding changes to the documentation
• I have added tests that prove my fix/feature works (or explained why not)
• I have signed off all my commits per the DCO

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Walkthrough

The changes add an optional desktop-mirror dependency group and document its installation and runtime requirements. OVXR now accepts frame consumers and provides output, submission, completion, and shutdown callbacks. The desktop mirror selects render products, captures bounded snapshots, and displays them through OVUI. The implementation includes reusable CUDA image copies, mailbox ownership and cleanup, worker status and cadence reporting, and tests for session lifecycle, image capture, GPU operations, and UI behavior.

Priority: Normal

Estimated code review effort: 4 (Complex) | ~60 minutes

Sequence Diagram(s)

sequenceDiagram
  participant OvxrSession
  participant OwnedDesktopMirror
  participant OwnedMirrorMailbox
  participant OwnedDesktopMirrorWorker
  participant OVUI
  OvxrSession->>OwnedDesktopMirror: on_session_started(binding, config, request_shutdown)
  OvxrSession->>OwnedDesktopMirror: on_outputs(renderer, outputs, shared)
  OwnedDesktopMirror->>OwnedMirrorMailbox: capture selected output
  OvxrSession->>OwnedDesktopMirror: on_frame_submitted after successful submission
  OwnedDesktopMirror->>OwnedDesktopMirrorWorker: start on first submitted frame
  OwnedDesktopMirrorWorker->>OwnedMirrorMailbox: acquire snapshot
  OwnedMirrorMailbox-->>OwnedDesktopMirrorWorker: selected image snapshot
  OwnedDesktopMirrorWorker->>OVUI: upload image and update status

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Merge Risk: Low · previous review b3290

The optional desktop mirror sets an environment default from a background thread while native teleoperation threads run, which can very rarely crash the process. Moving the default to an application-thread step before the session worker starts is a small fix; the rest of the change looks mergeable.

Pre-merge checks: 4

Check name	Status	Explanation
Description Check		Check skipped - CodeRabbit’s high-level summary is enabled.
Title check		The title clearly and concisely describes the primary change: adding a desktop mirror to OVXR teleoperation.
Linked Issues check		Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check		Check skipped because no linked issues were found for this pull request.

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Actionable comments posted: 1

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• 🪄 Fix comments: Fix CodeRabbit comments on this PR

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Inline comments:
Review comments at
@src/python/isaaccapture/ovxr_session_manager/owned_mirror.py:
- Line 503: Move the OMNIUI_BACKEND default out of
OwnedDesktopMirrorWorker._run() to an application-thread preparation hook on
OwnedDesktopMirror, and invoke that hook from OvxrSession.start() immediately
before starting the OVXR worker. Keep the setdefault behavior and update the
test that currently expects a direct _run() call to set the environment
variable.

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• Source mode: Auto
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📥 Commits

Reviewing files that changed from the base of the PR and between c6efde9 and b3290d9.

📒 Files selected for processing: 19

• README.md
• docs/source/getting_started/ovxr.rst
• pyproject.toml
• src/compat/pyproject.toml
• src/core/python/CMakeLists.txt
• src/core/python/pyproject.toml.in
• src/core/python/requirements-desktop-mirror.txt
• src/python/isaaccapture/ovxr_session_manager/__init__.py
• src/python/isaaccapture/ovxr_session_manager/desktop_mirror.py
• src/python/isaaccapture/ovxr_session_manager/gpu_output.py
• src/python/isaaccapture/ovxr_session_manager/ovxr_session.py
• src/python/isaaccapture/ovxr_session_manager/owned_mirror.py
• tests/python/core/ovxr_session_manager/conftest.py
• tests/python/core/ovxr_session_manager/test_desktop_mirror.py
• tests/python/core/ovxr_session_manager/test_gpu_mirror.py
• tests/python/core/ovxr_session_manager/test_mirror_swap_interval.py
• tests/python/core/ovxr_session_manager/test_ovxr_session.py
• tests/python/core/ovxr_session_manager/test_owned_mirror.py
• tests/python/core/ovxr_session_manager/test_passive_mirror.py

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[rwiltz]

Design comments on the frame-consumer interface and desktop mirror. See the summary on #1294.

[rwiltz]

Re-review of ae48621: two issues worth fixing in the mirror.

[rwiltz]

This fence only proves OVUI finished reading gpu.pointer if set_bytes_data_from_gpu copies synchronously or on the legacy stream of gpu.device. If OVUI copies on its own non-blocking stream, through Vulkan, or as a peer copy queued on the display device, the image is released while OVUI may still be reading it, and the render thread can immediately reuse that slot with cudaMemcpy2DFromArrayAsync, giving torn frames. Can you point to OVUI 0.3.0's contract for this (or use a completion fence OVUI exposes)? The comment at release() states it as given.

[rwiltz]

Race with render-thread close(): record_host_frame, set_status_text and status check self._worker is not None and then dereference it, while close() sets self._worker = None on the render thread. A host loop that is still calling record_host_frame() can get AttributeError: 'NoneType'. That window is reachable when the worker retires without waiting for _borrowers_quiesced (startup failure before handles were exposed). Read self._worker into a local once in each method.