acdream

A modern open-source C# / .NET 10 Asheron's Call client.

Faithful port of the retail client's behaviour to Silk.NET with a modern, plugin-friendly architecture. The code is modern; the behaviour is retail.

Status: playable pre-alpha; M3 ("Cast a spell") is active. The connected client supports the complete M2 combat/loot/inventory loop plus retained spellbook, component-book, favorite-spell, enchantment, portal-space, radar, chat, character, and inventory UI. Current work is verification and retail conformance, not a first-playable bring-up.

Start at the documentation map for the current milestone, roadmap, tactical issues, architecture, retail-divergence register, research, and durable memory.

Stack

• Language: C# .NET 10
• Graphics: Silk.NET (OpenGL 4.3 context; GL_ARB_bindless_texture and GL_ARB_shader_draw_parameters are mandatory)
• Audio: OpenAL via Silk.NET
• Dat parsing: Chorizite.DatReaderWriter
• Networking: Custom UDP + ISAAC cipher + game-message layer, wire-compatible with ACEmulator server

What works today

• ACE login, character selection, world entry, chat, client commands, and graceful logout.
• Outdoor, building, cellar, and dungeon streaming with portal-space travel, terrain/scenery/EnvCell rendering, collision, lighting, sky, fog, audio, and day/night presentation.
• Local and observed player/NPC/monster movement, animation, selection, radar, combat stances, melee and missile presentation, death, corpses, chests, and looting.
• Inventory bags, stack splitting, paperdoll/equipment, weapon switching, quick bars, item use, giving items to NPCs, and server-authoritative item movement.
• Retained retail-style gameplay UI for vitals, chat, toolbar, inventory, character/skills, spellbook/components, helpful/harmful effects, combat and spell bars, radar/compass, indicator pages, and confirmation dialogs.
• Spell catalog, learned/favorite spells, component preflight, connected casts, enchantments, DAT-driven missiles/effects, recall, Hidden/UnHide, and portal materialization presentation.
• Plugin host, shared input/command abstractions, and permanent ImGui developer tools behind ACDREAM_DEVTOOLS=1.

Active gaps

• R6's complete object-frame update path still needs the next local visual comparison; the final M3 gate is a two-client portal-out/materialization observer comparison.
• Issue #225 still needs the lifestone/particle alpha-order visual check, although its connected lifetime/performance gates pass.
• Narrow behavior debt remains in issue #153 (an unstreamed far-teleport edge case), issue #116 (slide feel), and registered TS-50/TS-51 effect timing.
• Many later retail systems remain roadmap work: advanced social/vendor/trade/ crafting UI, full weather/lightning parity, deeper combat/stat systems, graphical Linux, and a true headless multi-session bot host.

See docs/README.md for document authority and current links.

Building + running

Requires:

• .NET 10 SDK
• A retail Asheron's Call dat directory (Turbine/Microsoft property — supply your own). Contains client_portal.dat, client_cell_1.dat, client_highres.dat, client_local_English.dat.
• A running ACE (ACEmulator) server on 127.0.0.1:9000 (or override via env var)

Launch (PowerShell on Windows — bash has trouble with the apostrophe in "Asheron's Call"):

$env:ACDREAM_DAT_DIR   = "$env:USERPROFILE\Documents\Asheron's Call"
$env:ACDREAM_LIVE      = "1"
$env:ACDREAM_TEST_HOST = "127.0.0.1"
$env:ACDREAM_TEST_PORT = "9000"
$env:ACDREAM_TEST_USER = "testaccount"
$env:ACDREAM_TEST_PASS = "testpassword"
$env:ACDREAM_RETAIL_UI  = "1"
dotnet run --project src\AcDream.App\AcDream.App.csproj -c Release

Offline CLI dat inspector (no server needed):

dotnet run --project src/AcDream.Cli -- "C:\path\to\Asheron's Call"

Diagnostic env vars

Variable	Effect
ACDREAM_DUMP_SKY=1	Per-second dump of the interpolated SkyKeyframe values + per-SkyObject draw info + texture alpha histograms
ACDREAM_DUMP_MOTION=1	Dump every inbound UpdateMotion + resulting SetCycle
ACDREAM_STREAM_RADIUS=N	Legacy override for the configured two-tier streaming radii
ACDREAM_NO_AUDIO=1	Suppress OpenAL init
ACDREAM_RETAIL_UI=1	Enable retained retail gameplay UI
ACDREAM_DEVTOOLS=1	Enable ImGui developer tools
ACDREAM_UNCAPPED_RENDER=1	Disable normal presentation pacing for throughput measurement
ACDREAM_DAY_GROUP=N	Force a specific DayGroup index for A/B-testing weather presets
ACDREAM_RUN_SKILL=N / ACDREAM_JUMP_SKILL=N	Client-side run/jump skill (default 200)

Layout

src/
  AcDream.App/                   window, retained UI, rendering, audio, runtime wiring
  AcDream.Content/               GL-free DAT mesh/texture extraction
  AcDream.Core/                  game state, physics, movement, world, gameplay logic
  AcDream.Core.Net/              UDP + ISAAC + game-message layer
  AcDream.UI.Abstractions/       shared UI/input ViewModels, commands, contracts
  AcDream.UI.ImGui/              permanent developer-tool renderer
  AcDream.Cli/                   offline dat-inspector console app
  AcDream.Bake/                  offline content bake tooling
  AcDream.Plugin.Abstractions/   plugin host interfaces
  AcDream.Plugins.Smoke/         example plugin

tests/
  AcDream.*.Tests/               layer-matched xUnit projects (6,452 passing,
                                 5 intentional skips at the 2026-07-20 baseline)

tools/
  RetailTimeProbe/               Win32 P/Invoke ReadProcessMemory probe of
                                 the live retail acclient.exe — dumps
                                 TimeOfDay + sky-lighting globals so we
                                 can compare against acdream's state
  SkyObjectInspect/              dat-inspector for Region sky objects

references/                      vendored read-only reference code — ACE,
                                 ACViewer, WorldBuilder, holtburger,
                                 AC2D, Chorizite, DatReaderWriter.
                                 Gitignored.

docs/
  README.md                      documentation map + authority order
  architecture/                  architecture, structure, divergence, WB inventory
  plans/                         phase roadmaps + per-phase specs
  research/                      decompile-derived research, per-phase
                                 findings, deep-dive agent reports
  audit/                         phase-completion audits

Development workflow

All AC-specific behaviour is ported from the named retail client oracle (docs/research/named-retail/). The workflow is:

1. Grep named retail first. Find the matching class::method in the Sept 2013 named pseudo-C and headers.
2. Decompile only as fallback. Use the older Ghidra chunks when the named oracle lacks the function.
3. Cross-reference. Check against ACE's C# port and ACViewer / WorldBuilder.
4. Write pseudocode. Translate C to readable pseudocode first.
5. Port faithfully. Translate line-by-line, preserving variable names and control flow.
6. Conformance test. Add tests using golden values from retail.
7. Integrate surgically. Minimise churn in the surrounding pipeline.

Guessing at AC-specific algorithms is explicitly forbidden — see CLAUDE.md for the full workflow rationale and the list of failure modes we've paid for in the past.

Reference repos

We cross-reference six external projects for retail behavior:

• ACE (ACEmulator) — authoritative server-side protocol
• ACViewer — MonoGame dat viewer; good for character appearance
• WorldBuilder — Silk.NET dat editor; matches our stack
• Chorizite.ACProtocol — clean-room C# protocol library
• holtburger — most complete non-retail client; Rust TUI, full client-side behaviour
• AC2D — C++ AC-client emulator; has the real terrain split formula and 0xF61C movement packet format

See CLAUDE.md for which reference is authoritative for which domain.

Licence

Not yet chosen. All external reference code is vendored under its own licence; see references/*/LICENSE. The acdream source code itself is unreleased — not yet distributed to the public. Once the licence choice is made it will go in a top-level LICENSE file.

The AC dat files and the game's intellectual property remain the property of Microsoft / Turbine. This project does not distribute any of those files or assets — you must supply your own retail install.