going deeper into the abyss

Engine

• LED subsystem reworked: Support hotplug, synthesized LED devices, added support for a
  FIFO protocol for communicating with external LED controllers
• Accelerated Graphics: refactored to be dynamically (re-)loadable, getting closer to
  multi-vendor-multi-GPU support and GPU hotplugging.
• Driver backend update: external-launch reloads accelerated graphics library, getting
  closer to runtime driver upgrades
• Initial HMD/VR support: Early stages, spawn a subprocess for device control and input
  fusion/sampling with mapping to a virtual skeleton
• Allow direct-to-drain enqueue for out-of-band high-priority events

Tools (src/tools) / Backends (separate repositories)

• waybridge: (new) (alpha state, see wiki wayland notes) wayland protocol service
• xarcan: (new) xserver with shmif driver backend
• qemu: input state- fixes, closer to working multi-display and virgil support
• SDL: improved synchronization, mouse and multi-window support
• vrbridge: (new) basic integration skeleton and partial PSVR support (unusable)
• aclip: (new) clipboard manager for translation between appl- and command-line
• aloadimage: (new) image viewer with parser sandboxing
• shmmon: (new) debugging tool for inspection of shmif- connection dumps or single client
  state from scraping proc
• openal: patched backend can now be built standalone, back to working state for LWA

Shmif

• New segid subtypes: WIDGET, BRIDGE_X11, BRIDGE_WL, SERVICE
• Two new sub-libraries: shmif_ext (extended accelerated rendering setup convenience) and
  shmif_tui (text user interface)
• _open_ext added exposing additional initial-registration fields
• Extended connection protocol to include a preroll stage which act as a collection
  phase for fonts, outputs, language, etc. in order to cut down on initial setup complexity
  and reduce connect-to-draw latency.
• added _initial structure that conveys information gathered during the preroll stage
• add VSIGNAL RHINT to support event- based notification on frame delivery for some I/O
  multiplexation edge cases
• Engine-side reservable misc- buffer added to shmpage layout for specialized I/O devices
  that would saturate the event queues when dealing with latency-sensitive high-samplerate
  input devices
• Negotiable extended mapping for synchronizing gamma/color information
• Negotiable (placeholder/incomplete) extended mapping for supporting HDR source contents
• Negotiable (placeholder/incomplete) extended mapping for vector content transfer

Platform

• egl-dri: backlight support exposed as a LED controller, VT switch stability fixes,
  EGLStreams support moved from the egl-nvidia platform, removed egl-nvidia, add switchable
  synchronization strategies for fast, adaptive or conservative.
• evdev: devices with LEDs now get mapped to a corresponding LED controller.
• agp: exposed more color packing formats.

Terminal

• Tuning to resize/- refresh cpu v latency tradeoffs
• Refactored codebase and split out drawing/shmif- integration etc. into using shmif_tui.
• Minor bugfixes related to color parsing, added blink speed control

Lua

• Deprecated: LED_CONTROLLERS constant
• target- event propagation extended:
• Added functions: hmd_setup, define_arcantarget (LWA only, experimental)
• Updated functions: controller_leds, set_led, set_led_intensity, set_led_rgb,
  open_nonblock, audio_gain, video_displaygamma, decode_modifiers,
  target_flags, add_3dmesh
• Added constants: TARGET_ALLOW(CM,LODEF,HDR,VECTOR,INPUT)
• Added aliases: image_surface, image_surface_storage,
  image_surface_resolve (dropped properties suffix)
• Updated events: display_state (additional fields for backlight)
  input (status: extended label fields, device reference, device domain)
  target (expose "bchunkstate", "preroll")

LWA

• partial/incomplete: requesting/rendering to subsegments
  (icon, titlebar, popup, ...) via define_arcantarget
• improvements to runtime DPI switching and automated resize-response
• runtime server controlled 'default font' and 'default font size' switching