When Roblox asks for a keyboard (showKeyboard), a world-locked panel
opens below eye level as an OpenXR quad layer. Controllers point at keys
and the trigger types; text and key presses go through the same platform
events as the desktop keyboard, so the focused TextBox edits identically.
The layout is US QWERTY without the function row or Ctrl/Alt, with one-shot
Shift, Caps Lock, Tab, Backspace auto-repeat, Enter and Close. A trigger
aimed at the panel is withheld from Roblox so a key press is not also a
click. A text field above the keys mirrors the focused TextBox, whose
desktop overlay never reaches the eye images. MOCKTAIL_VR_KEYBOARD=0 turns
it off.
vr.frame_rate_limit / MOCKTAIL_VR_FRAME_RATE_LIMIT replaces
graphics.frame_rate_limit while VR is active and takes the same values.
It defaults to unlimited so xrWaitFrame paces Roblox at the headset
refresh rate instead of Roblox's own 60 FPS cap.
MOCKTAIL_VR_RENDER_SCALE scales the runtime's recommended eye extent.
SteamVR's recommendation for a Quest 2 at 90 Hz (2244x2352 per eye) missed
the 11.1 ms budget and halved the rate to 45 FPS.
MOCKTAIL_VR_UNPACED=1 stops guest frames from blocking in xrWaitFrame:
the open XR frame spans several guest frames and is submitted once per
display period, for measuring maximum render rate.
SteamVR (vrclient.so) binds its Vulkan renderer to the lifetime of the
XrInstance. When Roblox destroys the LuaApp Vulkan device and creates a
second VkInstance/VkDevice for UGC experiences, reusing the original
XrInstance causes SteamVR to dereference freed device handles in xrEndFrame.
Tear down and recreate the XrInstance whenever a new guest Vulkan instance
is initialized, resetting session state, spaces, and controller actions.
Roblox maps some rbxasset:// names to downloads and opens no local file for
them. For each file under content/ in the overlay folder, change its name in
the loaded libroblox so Roblox opens the local file.
Idea from @dim-ghub in #20.
Roblox 2.742 moves the process-load constructor behind the JNI singleton
initializer and renames registers in the registry initializer. The deriver
finds each leading constructor by its code, and the loader checks that host
bridges run the checkpoint and JNI singleton constructors and skip the two
wiring entries.
strerror_r: Bionic's message table covers errno 0..133 except the
unassigned 41 and 58. Numbers outside that set now get "Unknown error N"
without consulting the host, so the text is the same on glibc and musl and
no longer relies on comparing against strerror_r(-1).
atoi: glibc's atoi is (int)strtol() like Bionic's, so the host symbol is
used there as before. The Bionic shim is registered only on libcs where
that is not true (musl). linker_registry_test expects the matching result.
Brings in 3e6f63e (drop libexecinfo), aa31cdf (Chimera/musl portability),
bc10810 (Bionic atoi, canary signal exit codes) and cb2e9dd (CI fixes).
Conflicts:
- tests/native_update_test.cc: keep both <cerrno> and <csignal>.
- tests/webview_helper_launcher_test.cc: keep the existing python3 socket
read; it already solves the dash multi-digit fd redirection problem that
upstream fixed by switching the helper to bash.
A driver can reject a present mode the device did not enable. Retry once with the mode the game asked for, except after errors another mode cannot fix.
Fill the 65 unimplemented JNI table slots with stubs that log once and return zero, so a call no longer jumps to address 0. A release of a handle with no reference count now returns, so a double release cannot queue one slot twice and give two objects the same handle.
dim-ghub