On the Frame the atomic-branch detours never installed ("installation failed"): an mmap hint isn't honoured,
so the stub landed out of B range. Stubs now go into free gaps from /proc/self/maps within +-128 MiB of the
entry, mapped with MAP_FIXED_NOREPLACE (a relocated result is rejected); no gap = no hook. Every failure logs
the target and the failing step.
The detour helper from PR #34 (used by the metadata hook and PR #389's two geometry hooks) wrote a 16-byte
branch + literal in two steps while game threads may run the function (installation is retried from
xrPollEvent). Each hook now publishes a single aligned release-atomic AArch64 B to a stub within +-128 MiB;
the trampoline replays the one verified instruction and returns to entry+4. Every mprotect is checked;
failures before publication free the stub and trampoline and leave the function untouched; no stub in range =
no hook. Adapter artifacts rebuilt by us (the PR's binary isn't shipped).
The Frame's runtime has no XR_FB_display_refresh_rate (-7); OVRPort's dispatcher still
offers it and answered 0 Hz. Team Beef's idTech 4 ports run USERCMD_MSEC = 1000 / refresh,
so PreyVR had 0 ms tics: the async thread spun (~1.9M tics/s), com_frameTime stayed 0 and
the main menu's timeline never got past its first step (black backdrop + cursor only).
FrameBridge now always answers with 1 / predictedDisplayPeriod (else the refresh_rate
setting, else 72 Hz). Headless: menu drawn (snapshot mean 68 vs 0.1 before), clocks advance.
- glmv: gl_mv_debug=2 traces draws (state, GL errors per framebuffer), failed texture
uploads/copies/compiles and idTech 4 clocks; how this was found
- triage: a single xrEndFrame -16 is info, not the black-menu error it was blamed for
- PLAYBOOK row, CLAUDE.md fact, host test for the fallback rate
Scared By Squares (Unreal 4.27, OpenXR) creates two actions named "turn"
(an action mapping and an axis mapping called Turn). The Frame's runtime
accepts the duplicate, then vrserver fails to load the input manifest it
builds ("SetXrInputConfig failed. Failed to load manifest"), drops the
app's connection and treats it as exited: black, then the home environment
while the game keeps running with sound. Headless the app reconnected as a
plain OpenXR instance, got throttled to 10 fps and the compositor received
no presents.
- action_dedup (adapter setting, default on): a later duplicate action name
or localized name in a set is created as "<name>_N" / "<Localized> N"
(native/adapter/action_names.h, host-tested). Headless on the dev Frame:
manifest loads, 72 fps, 2808 presents in 45 s (before: 10 fps, none).
- input_diag logs every action set and action (escaped names).
- force_render (hidden diagnostic): xrWaitFrame reports shouldRender=TRUE so
headless runs exercise engines that skip layers when not visible; FrameBridge
logs shouldRender changes.
- Triage: space-warp-used only on the motion-vector swapchain (format 97);
D24S8 (129) eye depth falsely matched. New info finding duplicate-action-renamed.
- Catalog entry (status unknown, min_app 1.2.1), PLAYBOOK row.
Unity's Oculus XR plugin asks for SUBSAMPLED eye images through
XR_META_vulkan_swapchain_create_info. With device.foveation on, Valve's
injected FDM leaves their coarse areas in the subsampled layout and the
compositor shows them as garbage around the sharp area (Medieval
Dynasty: black with scattered coloured blocks). foveation_fix=1 only
dropped the XrSwapchainCreateInfoFoveationFB nodes.
The adapter's storage fix (clear SUBSAMPLED from the META node) now runs
whenever foveation_storage_fix is set, also with foveation_fix, and
device.foveation tracked/fixed sets it. Generic form of Batman's
OVRPlugin allocation fix. Adapter rebuilt; revision not bumped.
Opt-in game setting (Picture -> Draw fades over the picture). Batman: Arkham Shadow fades by dimming its projection
layer with XR_KHR_composition_layer_color_scale_bias; with fade_quad=1 FrameBridge adds a black, alpha-blended quad
right after the dimmed layer (VIEW space, 1 m ahead), opacity = 1 - scale in 16 steps. One 8x8 swapchain, refilled
only when the step changes (Vulkan clear on the app's queue / GLES clear in its context); one swapchain per step hit
XR_ERROR_LIMIT_REACHED. fade_quad=2 also removes the layer's own scale. Device (headless, Batman): swapchain created,
level 16/16 on the first frame, no xrEndFrame errors, 72 fps.
Mesa enforces OVR_multiview's rule that a draw's program declares as many views as the draw framebuffer has and drops the draw silently; Doom3Quest compiles every vertex shader with layout(num_views=2) and draws its HUD/PDA into 2D-texture FBOs, which stay black on the Frame.
native/glmv (libfpglmv.so, same length as libGLESv3.so): the engine library's dlopen string is rewritten to it and it becomes the first DT_NEEDED. It records stage sources at link time and, when a multiview program draws into a framebuffer without views, draws with a lazily built single-view twin (num_views layout blanked, gl_ViewID_OVR -> 0u; attribute locations, block bindings and uniform values copied), then rebinds the original. Opt-in and experimental (analysis gl_multiview_libs, ANALYSIS_VERSION 6), setting gl_mv_debug, triage gl-multiview-twin-failed.
Host tests: the rewriter on Doom3Quest's 19 shaders (GPL-3.0 fixtures) and glmv.c against a stand-in GL that applies Mesa's rule. Untested on the device.
BattleSisters' hands lagged behind the controllers (also with ovrp_hold_physics on or off). pose_debug=1 (new,
FrameBridge: per 5 s and per located space, the requested time minus the predicted display time) showed on the dev
Frame (SteamOS 0.4.5): XrTime runs 2.56 s ahead of CLOCK_MONOTONIC, the hand spaces were located at -2564 ms (the
monotonic "now" passed on as an XrTime: OVRPort's dispatcher converts XR_KHR_convert_timespec_time 1:1 and
FrameBridge's emulation is never asked) and the head at XrTime 0.1 s (~1450 xrLocateViews/xrLocateSpace per 5 s).
pose_time_fix (default off; suggested for Unity built-in OVRPlugin games): in xrLocateSpace(s)/xrLocateViews a time
nearer the monotonic clock than XrTime's "now" is moved by the offset measured at xrWaitFrame, one more than 0.5 s
before the display time goes to "now". Headless with it on: every far-past request moved, located times -9.8..0 ms
from the display time. Host unit test for the time rules; PLAYBOOK row.
Stress Level Zero's graphics plugin (libSLZQuestNative.so) hooks Unity's Vulkan start-up and vkCreateSampler; on
the Frame its vkCreateInstance wrapper calls an invalid pointer right after OVRPlugin's pre-init instance is
destroyed (pc 0, a jump into an unloaded library, or a hang). The new patch turns the plugin's two registrations into
no-ops (found through its exported functions, 4 bytes each), so Unity starts Vulkan itself; ~35 s of shader
prewarming without the plugin's pipeline cache, then 72 fps (headless). One BONELAB recipe serves 1.2068 and 1.2974.
Triage slz-vulkan-hook-crash, PLAYBOOK row, tests with a fixture built from tests/fixtures/src/fakeslz.S.
Each build probes OVRPort's output for registered upstream fixes and leaves out the workarounds they make
unnecessary (recipes unchanged: builds with an older runtime keep them). Logged ("not needed: ..."), recorded in
build.superseded, left out of settings.conf at install, shown on the game page and in `frameport show`;
FRAMEPORT_KEEP_WORKAROUNDS=1 turns it off. Registered: ovrport.haptic_envelope (-> adapter.haptic_fix) and
ovrport.microphone_stream (-> frame.ovr_microphone), both fixed in OVRPort runtime 3.4.3-aa54c3f (ovrport/app#73;
haptics verified in the headset with Lucky's Tale). Probes checked against both real runtimes; fixtures in
tests/fixtures/src/fakeruntime.S.
Some Quest games ship voice-over languages as <tag>.lang files and ask the Meta Platform SDK for them; overport's
platform loader answers with nothing, so every language but the built-in one stays greyed out. libfp_langpack.so
answers the language-pack and asset-file calls from the packs already on the device (Metadata = the game's
versionName, the /storage/emulated/0 path spelling Unreal uses). Tested in the headset with Deadpool VR (German
dialogue), AC Nexus and Asgard's Wrath 2.
spoopyghosty0