acdream/memory/project_retail_research_index.md

Retail AC research index — permanent lookup table

Written 2026-04-17. Points at the 20 research documents produced in that day's dual-swarm marathon (6 UI agents + 13 subsystem agents, all Opus-4.7 high-effort).

When to use: any time you're about to write code for a retail AC subsystem. Open the slice for that subsystem BEFORE writing the first line — every slice has pseudocode + C# port sketch + citations.

2026-04-25 update — named-retail foundation. First stop for any AC-specific question is now docs/research/named-retail/ (PDB-named Sept 2013 EoR decomp; 18,366 named functions, 5,371 named struct types, 1.4 M lines of pseudo-C). The slices below remain useful for their pseudocode + C# port sketches and the deeper research notes they synthesize. See memory/project_named_decompilation.md.

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UI layer (docs/research/retail-ui/) — 6 slices, ~30,000 words

ID	File	Use when…
—	00-master-synthesis.md	First read. Has cross-references + port decisions
01	01-architecture-and-init.md	Extending GameWindow's init flow or main loop
02	02-class-hierarchy.md	Adding new widget types to our UI toolkit
03	03-rendering.md	Building AcFont from portal.dat, dat sprites, scissor
04	04-input-events.md	Adding drag-drop, tooltip, focus, modal
05	05-panels.md	Porting chat, attributes, paperdoll, spellbook, inv
06	06-hud-and-assets.md	Vital orbs, radar, compass, any dat asset lookup

Subsystems (docs/research/deepdives/) — 13 slices, ~78,000 words

ID	File	Use when…
—	00-master-synthesis.md	First read. Has the full dependency graph + phase sequence
R1	r01-spell-system.md	Implementing cast flow, fizzle, mana cost, buffs, recalls
R2	r02-combat-system.md	Damage formula, hit-chance, crit, body-part targeting
R3	r03-motion-animation.md	Expanding MotionInterpreter, hook delivery, stance blends
R4	r04-vfx-particles.md	Building the particle system, PhysicsScript dispatch
R5	r05-audio-sound.md	Audio engine, SoundTable + Wave loaders, 3D falloff
R6	r06-items-inventory.md	Item model, Container, Appraise, burden, stack-split
R7	r07-character-creation.md	Char-creation panel, heritages, skill credits
R8	r08-network-protocol-atlas.md	Anything wire-format. Complete opcode map.
R9	r09-dungeon-portal-space.md	Dungeon streaming, PlayerTeleport flow, portal visibility
R10	r10-quest-dialogs.md	Emote scripts, NPC dialog, quest timers, contract tracker
R11	r11-allegiance.md	Allegiance tree, XP passup, allegiance chat channels
R12	r12-weather-daynight.md	Sky dome, day/night, rain/snow, Portal Year clock
R13	r13-dynamic-lighting.md	LightInfo dat, 8-light cap, cell ambient, blob shadow

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Existing research from prior sessions (separate from these 20)

• docs/research/acclient_function_map.md — already-mapped FUN_ addresses (physics, motion, terrain, landblock)
• docs/research/2026-04-12-movement-deep-dive.md — cross-client movement cross-check
• docs/research/2026-04-13-phase-audit.md — audit of decompile-verified vs guessed AC-specific code

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Critical cross-cutting findings (quick reference)

Architecture facts

• Retail UI runs in keystone.dll, not acclient.exe. Own-toolkit approach is the only viable path. Use retail event codes (0x01, 0x15, 0x3E, 0x201) so hand-ported panel code translates cleanly.
• Weather is client-deterministic from Portal Year time. No SetWeather opcode exists. Same clock everywhere → same sky everywhere.
• Lighting is D3D fixed-function, 8-light cap, no attenuation inside Range then hard cutoff. Terrain baked per-vertex via AdjustPlanes.
• Motion hooks drive audio + VFX + combat timing. R3 motion-hook expansion is the blocker for R2, R4, R5 to feel retail-faithful.

Wire protocol facts

• Of 94 GameEvents (S→C envelope 0xF7B0), 0 are handled today. Biggest network gap.
• GameMessage 0xF7E0 SystemChat, 0xF7DE TurbineChat, 0xF748 UpdateMotion, 0xF751 PlayerTeleport, 0xF750 PlaySound, 0xF755 PlayEffect are all unhandled.
• LoginComplete (0x00A1) must be re-sent after PlayerTeleport.

Dat-ID ranges (de-duplicated across all 20 docs)

Range	Type	Used by
0x0A000000..0x0A00FFFF	Wave	R5
0x20000000..0x2000FFFF	SoundTable	R5
0x0E000002	CharGen	R7
0x2F…	SpellTable	R1
0x30…	SpellComponentsTable	R1
0x40000000..0x40000FFF	Font	UI03
0x06……	RenderSurface	UI03, UI06, R13 shadow 0x0600102F
0x21…	LayoutDesc	UI06
0x14…	MasterInputMap	UI06

Retail-faithful formulas already extracted

// Spell fizzle (R1)
chance = 1 / (1 + exp(-0.07 * (skill - difficulty)))  // 0 if skill < diff-50

// Hit chance physical (R2)
chance = 1 - 1 / (1 + exp(0.03 * (attackSkill - defenseSkill)))

// Hit chance magic (R2)
chance = 1 - 1 / (1 + exp(0.07 * (attackSkill - defenseSkill)))

// Burden max (R6)
max = 150 * Strength + Strength * bonusBurden

// Audio falloff (R5)
att = (minDist^2) / (dist^2)    (clamped 0..1, no doppler/cone/HRTF)

// Allegiance XP passup (R11)
direct   = 50   + 22.5 * loyalty/291 * (1 + RT/730 * IG/720)
indirect = 16   + 8.0  * loyalty/291 * (1 + RT/730 * IG/720)

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Standing invariant for future sessions

Before writing any retail-AC-specific code, grep this index for the subsystem and open the matching slice. The sliceds give you pseudocode + C# port sketch + citations — you'll save hours and avoid hallucinating constants. If the subsystem isn't in the 20 slices, add it to the roadmap and consider dispatching an Opus-agent research pass for it before coding.