Implementation Status

Implementation Status

Feature Matrix

Foundation Modules

Module	Target	Feature	Status	Notes
core/	lpl-core	Platform types, assertions, logging	✅ 100%	C++23, -fno-rtti, -fno-exceptions
math/	lpl-math	Vec3, Quat, Fixed32, CORDIC, BoundaryBox	✅ 100%	CUDA-compatible via LPL_HD
memory/	lpl-memory	PinnedAllocator (CUDA zero-copy fallback)	✅ 100%	cudaHostAlloc mapped+portable, malloc/free fallback

Data Structure Modules

Module	Target	Feature	Status	Notes
container/	lpl-container	FlatAtomicsHashMap (lock-free, wait-free get)	✅ 100%	64-bit packed [Morton 42b | pool idx 22b], forEach safe under lock
container/	lpl-container	Morton 2D/3D encoding + bias	✅ 100%	Z-order curve, part1by1/part1by2 bit-interleave, +2²⁰ bias
concurrency/	lpl-concurrency	ThreadPool (fixed workers, detach/async)	✅ 100%	—
concurrency/	lpl-concurrency	SpinLock (RAII, _mm_pause)	✅ 100%	—

Simulation Modules

Module	Target	Feature	Status	Notes
ecs/	lpl-ecs	EntityRegistry (sparse set + generational IDs)	✅ 100%	publicId→chunk O(1)
ecs/	lpl-ecs	Partition — SoA double buffer, physics, migration	✅ 100%	Backward iteration fixed
ecs/	lpl-ecs	Dynamic Octree (rebuild + query)	✅ 80%	Not auto-called in step()
physics/	lpl-physics	WorldPartition (chunk orchestrator, double buffer)	✅ 100%	—
physics/	lpl-physics	AABB Collision (impulse, iterative solver)	✅ 90%	4 iterations, auto wake
gpu/	lpl-gpu	CUDA physics kernels	✅ 100%	PhysicsKernel.cu ported, semi-implicit Euler, inline stubs without nvcc

I/O Modules

Module	Target	Feature	Status	Notes
net/	lpl-net	Network (driver + socket fallback + PacketQueue)	✅ 100%	Tri-mode transport
net/	lpl-net	SessionManager + Systems	✅ 100%	—
input/	lpl-input	InputManager (keys, axes, neural per entity)	✅ 100%	Shared srv/cli logic
platform/	lpl-platform	HW backends (clock/display/gpu-memory/input)	🔄 Interfaces	linux + kernel backends
serial/	lpl-serial	State serialization & deterministic replay	🔄 Partial	StateSnapshot + ISerializable; Recorder/Player stubs

Presentation Modules

Module	Target	Feature	Status	Notes
render/	lpl-render	Software rasterizer + Vulkan backend (IRenderer)	🔄 90%	RenderParity, PBR, foveated, ray tracer; ImGui integrated
image/	lpl-image	2D software imaging (Surface, Painter, Codec)	🔄 Partial	GPU-free frame/texture production
scene/	lpl-scene	Scene graph (Scene, Transform2D)	🔄 Partial	—
audio/	lpl-audio	Spatial audio	⬜ Stub	HRTF @todo
haptic/	lpl-haptic	Haptic/vestibular feedback	⬜ Stub	Actuator mapping @todo

Tooling

Module	Target	Feature	Status	Notes
bench/	lpl-bench	Benchmark harness (Harness, SystemInfo)	✅ 100%	mean/min/p99/variance, real-time budget classes

Kernel

Module	Feature	Status	Notes
kernel/	Netfilter hook + RX/TX ring buffers + mmap	✅ 100%	Bidirectional, 0% loss
kernel/	lpl_protocol structures (C-compatible)	✅ 100%	ioctl kick TX

BCI Module

Module	Target	Feature	Status	Notes
bci/	lpl-bci	OpenBCIDriver — USB-serial, ring buffer, 8 channels	✅ 100%	33-byte packets, 24-bit ADS1299 sign extension, EMA smoothing
bci/	lpl-bci	Per-channel FFT (Hann, 256 pts)	✅ 100%	PSD stored per channel, alpha/beta band extraction
bci/	lpl-bci	SignalMetrics — Schumacher $R(t)$, RMS, baseline	✅ 100%	discrete $\int$ PSD 40–70 Hz, hz_to_bin, mean + σ; 12 tests ✅
bci/	lpl-bci	RiemannianGeometry — $\delta_R$, $D_M$, Jacobi	✅ 100%	SPD covariance (Bessel), affine-invariant $\delta_R$, Mahalanobis via matrix_inv; 12 tests ✅
bci/	lpl-bci	NeuralMetrics — from_state(), muscle_alert	✅ 100%	baseline normalisation, muscle_alert threshold
bci/	lpl-bci	Calibration — rest-phase baseline	🔄 In progress	~30 s rest → baseline_R, σ
bci/	lpl-bci	BrainFlow / LSL / OpenViBE sources	🔄 Unblocked	Now packaged in official xmake-repo

Applications

Executable	Target	Feature	Status	Notes
Server	lpl-server	Core + Systems + broadcast 60Hz	✅ 100%	apps/server/main.cpp
Client	lpl-client	Core + Systems + Vulkan + BCI	🔄 90%	apps/client/main.cpp
Benchmark	lpl-benchmark	CPU benchmark suite	✅ 100%	apps/benchmark/main.cpp

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Global Score

Foundation (core, math, memory): 100% ✅

Data structures (container, concurrency): 100% ✅

Simulation (ecs, physics, gpu): ~95% — Octree at 80%

I/O (net, input, serial): ~65% — server meshing, GPUDirect RDMA

Presentation (render, audio, haptic): ~30% — Vulkan at 90%, stubs for audio/haptic

BCI: ~70% — Core DSP complete, external source integrations excluded

Applications: ~97% — Client at 90%

Estimated weighted score: ~80% of target architecture

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Backlog & Roadmap

Ideas and features that are designed but not yet complete. Several already have a stub or an in-progress implementation in the tree; the rest are planned directions kept here so the intent is not lost.

Networking & distribution

Feature	State	Notes
Server Meshing	🔄 Stub (net/ServerMesh)	Multi-server worlds, one chunk = one migratable unit. Remaining: serialize entity data to a target node, mesh heartbeat/registration.
Rollback netcode	🔄 Stub (net/netcode/RollbackStrategy)	Circular buffer of serialized state snapshots for client-side rollback/reconciliation.
Session RCU	🔄 Planned	SessionManager moves to Read-Copy-Update semantics for lock-free concurrent reads during broadcast.
GPUDirect RDMA	⬜ Idea	Zero-copy GPU↔NIC transfer. Requires specific hardware.
Packet compression	⬜ Idea	Protocol is already variable-length, so compression can be layered on top.

BCI

Feature	State	Notes
Auto-calibration	🔄 In progress (bci/calibration/)	~30 s rest phase → per-subject baseline_R and σ used to normalize metrics.
Visual/neuro feedback loop	⬜ Idea	Close the loop: simulation reacts to NeuralMetrics (concentration, muscle alert) in real time.
External sources (BrainFlow / LSL / OpenViBE)	🔄 Unblocked	Packages now merged into the official xmake-repo; sources can be enabled once wired in.

Simulation & rendering

Feature	State	Notes
Octree auto-integration	🔄 80%	FlatDynamicOctree is built per Partition but updateSpatialIndex() is not yet called automatically in step().
Dirty-list component tracking	⬜ Idea	Track which entities the network touched so the GPU only recomputes what changed (finer than the current full pass).
Convex collision (GJK / SAT)	⬜ Stub (physics/CollisionDetector)	Beyond AABB: GJK for convex hulls, SAT for OBB vs OBB.
Replay record/playback	🔄 Stub (serial/ReplayRecorder/ReplayPlayer)	Serialize frames + snapshots to disk, seek by tick, replay forward.
Spatial audio	⬜ Stub (audio/)	HRTF listener positioning, distance attenuation.
Haptic / vestibular feedback	⬜ Stub (haptic/)	Map world position to nearest actuator and modulate intensity (GVS, tFUS).

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