vr.anti_aliasing now takes fxaa, smaa or off. SMAA runs the reference
implementation (third_party/smaa, MIT) at its High preset: luma edge
detection and blending weights into per-eye images, then neighborhood
blending into the runtime's swapchain through FXAA's final pass. Its area and
search lookup textures are uploaded once per device. If SMAA cannot be set
up, the eyes fall back to FXAA.
Also export vr.anti_aliasing from config.yaml: the VR backend reads the
process environment, so the setting only worked as an environment variable.
On a Quest 2 through SteamVR at 120 Hz (2136x2236 per eye), SMAA ran at 118.6
fps against 118.8 for FXAA, with p99 frame times of 10.1 and 9.5 ms.
Emulated images keep a running total of their decoded and ETC2/EAC sizes over every mip and layer. --profile writes both as counters, and summarize_profile_trace.py prints their peaks.
Roblox's VR debug device renders both eyes into single-sample textures, so
edges were jagged in the headset. When the eyes go to the runtime's
swapchain, an FXAA draw now replaces the plain copy. It samples the eye
directly, and re-encodes for sRGB swapchains so the guest's bytes round-trip
exactly. Anything it cannot set up falls back to the copy.
vr.anti_aliasing (fxaa, the default, or off) controls it. The SPIR-V is
generated from shaders/vr by scripts/generate_vr_shaders.py and checked in,
so builds need no shader compiler; a test checks it against the sources when
glslc is installed.
On a Quest 2 through SteamVR at 90 Hz (2244x2352 per eye) frame times did not
change. Captured output keeps 97 to 98 percent of pixels byte-identical and
the average brightness unchanged, and smooths the edges.
Without a headset SteamVR refuses the OpenXR client at xrCreateInstance
(VRInitError_Driver_WirelessHmdNotConnected) instead of reporting no system,
so say that it usually means no headset is connected. Describe vr.mode in the
README, docs/VR.md and the changelog.
- Remove the MOCKTAIL_VR_TEST_SESSION_LOSS_AFTER fault injection; nothing
used it.
- The scripted head pose and the eye evidence dumper only work in builds
configured with -DMOCKTAIL_VR_DIAGNOSTICS=ON (default OFF); release
builds ignore their environment variables.
- Remove FindFmodInputCaptureProfile and HasExpectedFmodInputCaptureVtable
(only their own tests called them) and the never-defined
PrepareCaptureLocked declaration; the audio bridge files match upstream
again.
- docs/VR.md lists every MOCKTAIL_VR_* variable with its default, linked
from the README.
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.
Each ETC2 upload created and destroyed its own staging buffer on the render
thread. Uploads now take ranges of 16 MiB blocks, reused once every range
is released; four empty blocks are kept. Profile traces gain per-frame CPU
time counters and slices for staging and driver memory calls.
Uploads decode on a background dispatcher and the submit carries a
timeline semaphore wait, so the GPU waits for the texture rather than
the render thread. The gather of the application's compressed bytes
moves there too when they are already mapped; unmapping or freeing that
memory drains the decodes still reading it.
Staged copies gain an explicit host-write barrier. A queue submission
only makes host writes from before it visible to the device, and these
writes land after the submit.
Devices without timelineSemaphore, and submits whose pNext already sizes
arrays by their semaphore counts, decode inline as before.
Blade Ball, median of three: worst vkQueueSubmit 140ms -> 1ms, p99
4.9ms -> 0.05ms, total 2534ms -> 309ms. Frame interval unchanged; its
tail is the engine's own main-thread step.
Default title is Roblox, details "Playing {place_name}", and state
"by {creator_name}". The creator comes from the games API response
already fetched for the place name. A text field that expands an
empty placeholder is left out, so the state never shows a bare "by".
Release the GameMode request when the daemon narrows the CPU mask; the pin
concentrates Roblox's worker pool and is re-applied every few seconds, so
ending the request is the only thing that lifts it. `gamemode: on` keeps it.
Emit texture uploads on worker threads instead of serially inside
vkQueueSubmit, in two passes so mip 0 lands before the levels scaled from it.
Decode ETC2 through a persistent pool and lower the parallel floor to one
128x128 image, so small batches stop running single-threaded.
Document all three in docs/PERFORMANCE.md.
Records presents, GPU waits, submits, ETC2 decode, and pipeline and shader creation for ui.perfetto.dev. Adds a benchmark guide and a trace summary script.
text.title sets the activity name, images.* set the large and small icons and hover text, and text.state may be empty to hide it. Text and image fields expand {place_name} and {place_icon}; fields that render empty are omitted. show_place_name: false now also hides the place thumbnail.
Discord Rich Presence item 1 is custom presence fields; the private-server
join item is dropped. The profiling item names the Chrome trace format
instead of Perfetto.
Item 2 covered hot-plug and input release on disconnect, which already
work, so it is now only the button glyph gap. Raw mouse and the pointer
fix move to Shipped.
Drops the BCH donation address from the README.
InstanceBrick