Project Structure

Layout for the 姫狩りダンジョンマイスター (Himegari) → open AGE-engine reimplementation. The guiding rule is source vs. derived vs. our work: the shipped game is read-only input, the extracted archives and everything our tools generate are disposable/reproducible, and our code + docs live entirely apart from the game install. Nothing we produce is ever written back into the game folder.

Workspace root: S:\Game Hacking\Eushully\Himegari\

S:\Game Hacking\Eushully\Himegari\           ← workspace root (three siblings)
│
├── Himegari_Game/                          ← SOURCE — pristine game install (read-only)
│   │   Never edit, move, or add to this folder. It holds ORIGINALS ONLY.
│   ├── AGE.EXE, AGERC.DLL, *.dll             shipped engine (packed). Stays intact and
│   │                                         runnable in place — Frida launches it if needed.
│   ├── DATA1-5.ALF, APPEND01.ALF/.AAI        shipped archives (~2.3 GB).
│   ├── *.BIN                                 49 loose patch-override scripts (v1.03) —
│   │                                         AUTHORITATIVE over DATA1. Plus two root-only
│   │                                         engine files (SYS4INI=S4IC, SYS4AB=S4AB).
│   └── *.exe (uninstallers), SAS0099.OGG …   other shipped files.
│
├── extracted/                               ← DERIVED (game-side) — extracted ALF contents,
│   │                                          ~3.9 GB, regenerable with a local archive extractor.
│   └── DATA1/ … DATA5/                         DATA1 = 481 .BIN scripts (the corpus we parse)
│                                               + AGF/BMP/WAV in the others.
│
└── age-reimpl/                              ← OUR WORK (everything we made lives here)
    │
    ├── README.md                             navigation-only repository front door; canonical facts stay in docs/
    ├── THIRD_PARTY_NOTICES.md                 incorporated-code licenses + prior-research acknowledgment
    ├── global.json                           pins the validated .NET 8 SDK feature band
    ├── .editorconfig / .gitattributes        UTF-8, indentation, text/EOL, and binary-file policy;
    │                                         tracked source and generated references use canonical LF
    ├── .gitea/workflows/core-validation.yml  read-only Ubuntu source-only core gate for the private Gitea remote
    ├── run-godot.ps1 / run-godot.cmd         tracked development launcher + Windows wrapper;
    │                                          resolves Godot/game-root from parameters, environment,
    │                                          PATH, and the conventional sibling install
    ├── tools/                               Python tooling (parser/disassembler + extractors + VM)
    │   ├── paths.py                           ★ central path anchor — the ONLY place that knows
    │   │                                        where the game / extracted / build dirs are. All
    │   │                                        tools import it; relocatable with no other edits.
    │   ├── validate.py                        layered core/workspace/runtime/full validation driver
    │   ├── test_validate.py                   pure resolver + validation-plan regressions
    │   ├── sys4load.py                         loader + disassembler (opcode-decoding)
    │   ├── age_opcodes.py                      GENERATED complete Python ABI view (do not hand-edit)
    │   ├── opcodes_build.py                    generator/linter: vm-map/opcodes.toml -> the 5 artifacts below
    │   ├── opcodes_model.py                    load + lint (dangling-ref, confidence-ceiling, vocab) + dependents
    │   ├── age_opcodes_himegari.py             GENERATED from opcodes.toml (do not hand-edit)
    │   ├── globals_build.py                    generator/linter: vm-map/globals.toml (+auto map) -> build/globals.json, docs/global-reference.md
    │   ├── story_flags.py                      static story-flag miner (branch-condition) -> build/story-flags-candidates.json; --bootstrap
    │   ├── scjump_decode.py                    decode SCJUMP progression logic -> build/scjump-decisions.* ; --verify (VM cross-check)
    │   ├── test_globals.py, test_opcodes.py    unit tests for the globals / opcode tooling
    │   ├── vm0.py                              headless Python VM (Phase A0); `--test` = RECOVER unit test
    │   ├── extract_phase2.py                   batch: disasm + text + data extraction
    │   ├── extract_init.py, extract_message_table.py, global_map.py …
    │   │                                       *INIT / ID-dispatched message parsers,
    │   │                                       global-var map builder
    │   ├── validate_opcode_table*.py           decode-coverage validators
    │   ├── movie-corpus-gate/                  C# full-corpus FFmpeg decode/lifecycle acceptance tool
    │   └── probe_*.py                          format reverse-engineering probes (historical)
    │
    ├── bin/                                  ignored home for optional machine-local tools
    │   ├── README.md / .gitignore              tracked policy; binaries never enter Git
    │   └── BinExtractALF.exe + LzssCpp.dll     optional local archive oracle (unverified provenance)
    │
    ├── vm-map/                               VM / reverse-engineering reference artifacts
    │   ├── opcodes.toml                        ★ CANONICAL opcode reference (hand-edited: ABI + semantics
    │   │                                        + provenance + depends_on). Single source of truth for opcodes.
    │   ├── globals.toml                        ★ CANONICAL global-variable registry (hand-edited: name + category
    │   │                                        + value_domain + provenance). Single source of truth for globals/story-flags.
    │   └── opcode-leads.json, small-script-listings.md
    │
    ├── docs/                                 all documentation
    │   ├── PROJECT-STRUCTURE.md                this file (where things live)
    │   ├── tools-reference.md                  every tool: purpose, usage, I/O (operational companion)
    │   ├── asset-resolution-re.md              resId→file RE (graphics/audio); asset-index steering
    │   ├── global-memory-re.md                 runtime global observation RE (SHELVED; future starting point)
    │   ├── remake-architecture-and-roadmap.md  THE direction doc (phases A–E)
    │   ├── phase-a-slice-plan.md               the current slice (A0/A1/A2)
    │   ├── phase-b-framework.md                natural boot/menu/session → first-gameplay framework
    │   ├── platform-portability.md             OS dependencies + future cross-platform readiness
    │   ├── vm-mapping-plan.md                  the phased decode plan
    │   ├── himegari-port-reference.md          master reference + engine background
    │   ├── name-resolution.md                  call-script + global-var name recovery (+ globals.toml registry)
    │   ├── sys4-format-notes.md                byte-level container format
    │   ├── script-inventory.md                 what the 481 scripts are
    │   ├── opcode-reference.md                 GENERATED from opcodes.toml (human-readable opcode reference)
    │   ├── global-reference.md                 GENERATED from globals.toml (human-readable global registry)
    │   ├── scjump-progression.md               SCJUMP progression decode + SCINIT decision→scene registry
    │   └── engine-re.md                        native-engine RE (Ghidra+MCP): dispatch table, decompiled ops
    │
    ├── build/                               DERIVED (our-work-side) — generated by tools/; disposable
    │   ├── disasm/                            <NAME>.asm — human-readable disassembly, one per script
    │   ├── text/                              extracted text:
    │   │   ├── <NAME>.strings.txt               all inline strings in a script
    │   │   ├── dialogue.jsonl                   show-text lines only (the translation corpus)
    │   │   └── strings.jsonl                    every string, tagged by source opcode
    │   ├── data/                              parsed data tables (*INIT → JSON)
    │   ├── scripts-json/                      machine-readable full dumps (on demand via --json)
    │   ├── textures/                          AGF-to-BMP stills (convert_agf.py) - diagnostic pixel oracle only
    │   ├── engine-dump/                       UNPACKED engine dump (frida/dump_engine.py): range_<base>.bin + manifest.json
    │   ├── asset-index.json, asset-sections.json   asset resolver data (parse_sys4ini / resolve_asset)
    │   ├── global-var-map.{json,md}           partial global-variable name map (auto shape inference; feeds globals.toml merge)
    │   ├── globals.json                        GENERATED from globals.toml merged over global-var-map (sys4load labels + C# VM)
    │   ├── story-flags-candidates.json         GENERATED by story_flags.py (ranked story-flag review surface)
    │   ├── scjump-decisions.{json,md}          GENERATED by scjump_decode.py (progression decision table)
    │   ├── opcodes.json                        GENERATED from opcodes.toml (machine view for the C# VM)
    │   └── manifest.json, opcode-coverage.md   (opcode-coverage.md GENERATED from opcodes.toml)
    │
    ├── engine/                              DELIVERABLE — the .NET VM/runtime projects and tests (AgeEngine.sln)
    │   ├── Age.Engine/Model/                retained graphics state plus separately navigable public
    │                                       render, transition, diagnostic, and persistence contracts
    │   ├── Age.Engine/Sys4/                 runtime game-root selection, catalog parser, loose-first bounded
    │                                       ALF asset store, script provider, AGF/LZSS and Windows CUR decoders,
    │                                       and resource facade
    │   ├── Age.Engine/Text/                 backend-neutral glyph-mask requests/results, deterministic AGE
    │                                       compositor/layout, retained live/History glyph and wait-atlas
    │                                       publication, and bounded font/glyph cache primitives
    │   ├── Age.Engine/Persistence/          native S3SD/S4SD + S3RT codecs, shared payload/ReadTextDB,
    │                                       layout-3 numbered state/history/gfx, DAT/STH pair + BMP codec,
    │                                       and profile-owned state
    │   ├── Age.Engine.Frontend/             platform-neutral frontend support: diagnostics/options, page
    │                                       location, performance logging, movie runtime/FFmpeg decoding,
    │                                       audio alignment, surface registry, and WAV sanitization
    │   └── Age.Engine.Text.Windows/         optional exact Windows GDI gray-4 reference backend; kept
    │                                       outside the platform-neutral VM/runtime core
    ├── native/                              authored native runtime boundaries
    │   └── age_movie_ffmpeg/                project-owned FFmpeg C ABI, immutable Windows/Linux dependency manifests,
    │                                       and target bootstrap/build scripts (outputs stay under disposable build/)
    ├── tools/frida/                         runtime-capture + engine-dump scripts (see tools/frida/README.md)
    └── godot/                               DELIVERABLE — the Godot/C# ADV front-end (references Age.Engine
                                            plus the optional exact Windows text adapter). Its assembly embeds
                                            generated build/opcodes.json through HimegariRuntimeMetadata, so
                                            exports do not need repository discovery. Also contains the portable
                                            TextServer glyph adapter, per-profile font-substitution configuration,
                                            and TITLE-only F4 debug scene launcher

The Godot deliverable includes Himegari.sln because Godot's .NET exporter requires a solution, export_presets.cfg for the Linux x86_64 target, and build/.gdignore so disposable capture frames below the project do not enter its import or export scan. tools/export-linux-x64.ps1 produces and validates the complete disposable artifact under build/export/linux-x64/.

godot/Main.cs retains the front-end's startup and runtime coordination. Behavior-neutral partial-class companions keep cohesive surfaces independently navigable without changing the Godot node type or invocation paths: godot/Main.SelfTest.cs owns the synthetic threaded/headless regression harness, while godot/Main.Audio.cs owns BGM, voice, sound-effect, mixer-routing/persistence, and audio-bus control, and godot/Main.Movie.cs owns decoder staging, movie frame/audio publication, completion, and teardown. godot/Main.Compositor.cs owns retained/GPU/software composition state, texture resolution and caching, surface-transition drawing, raster helpers, and compositor decision logging. godot/Main.Input.cs owns Godot input routing, locator/debug hotkeys, debug-scene dispatch, cursor control, native alerts, and full-width text entry.

engine/Age.Engine.Frontend/ is the production owner of frontend helpers that do not depend on Godot types. Both engine/AgeEngine.sln and godot/Himegari.sln include the project; Godot and Age.Engine.Tests consume it through project references rather than compiling duplicate linked sources. The first owned cluster contains PageLocatorState, GodotTimelineLog, GodotTraceSink, StepLimitDiagnosticFormatter, GodotVmOptions, PerformanceFrameLog, and WindowLaunchOptions. It also owns the internal movie decoder boundary/runtime, audio-timeline alignment, movie-surface registry, and RIFF/WAVE sanitizer; only the Himegari and Age.Engine.Tests assemblies receive explicit friend access to that internal API. FFmpeg native interop and the asynchronous/paced decoder also live here; the Age.MovieCorpusGate tool receives friend access to the native frame-source seam and references this project rather than compiling source links. Reusable movie-corpus discovery, decode-gate, and report contracts live here as well; tools/movie-corpus-gate/Program.cs remains only the command-line entry point and output writer.

godot/GodotAdvHost.cs retains cross-domain host coordination. Its partial-class companion godot/GodotAdvHost.AdvText.cs owns live/retained ADV text, surface glyph rasterization and caching, history presentation, message-window alpha, and retained wait-indicator configuration/publication. godot/GodotAdvHost.PresentationInput.cs owns script/presentation synchronization, waits and timing, message-skip/input services, cursor and foreground waits, frame/backbuffer publication, transitions, and scene-context lifecycle coordination. godot/GodotAdvHost.Surfaces.cs owns decoded-image caching, mutable surface pixels/resources/dimensions, fill/copy/resolve operations, render-target publication, and surface/range teardown. godot/GodotAdvHost.Movies.cs owns movie surface bindings, ordinary and modal playback, movie-mask transitions, diagnostic snapshots, frame/completion publication, and mask teardown. godot/GodotAdvHost.Audio.cs owns BGM, voice and SFX resolution/dispatch, delayed voice state, volume/routing control, and blocking BGM fades; presentation/input retains the message-skip, reset, and frame-pulse consumers of that state through the sealed partial class.

engine/Age.Engine/Hosting/IHost.cs remains the aggregate runtime host accepted by the VM and existing host implementations. engine/Age.Engine/Hosting/IDiagnosticHost.cs owns recoverable-warning and modal-diagnostic reporting contracts, while engine/Age.Engine/Hosting/ILifecycleHost.cs owns script-context entry/exit, sleep and timed-deadline waiting, frame yield, and scene reset. engine/Age.Engine/Hosting/IAudioHost.cs owns BGM, voice, SFX, fade, volume, and route-control contracts, including the compatibility overload/default chains used by simple hosts. engine/Age.Engine/Hosting/IMovieHost.cs owns ordinary, positioned, mask-transition, activity-query, and modal movie playback contracts. engine/Age.Engine/Hosting/IGraphicsHost.cs owns mutable surfaces, retained-range/frame presentation, transitions, texture lifecycle, pixel capture/replace, draw, and size contracts. engine/Age.Engine/Hosting/IInputHost.cs owns modal fullwidth entry, ADV waits/callback servicing, input clock, cursor resources, and skip-state interaction. engine/Age.Engine/Hosting/IAdvHost.cs owns live and surface text, history presentation, ADV layout publication, message presentation settings, wait indicators, and page-presentation suspension. IHost inherits all seven focused contracts; every required member and overload/default chain remains unchanged. The neutral engine/Age.Engine/Model/MovieMaskTransitionRequest.cs record carries movie mask work between the VM, host, and retained graphics without making Model depend on Hosting. engine/Age.Engine/Model/RgbaImage.cs owns the format-independent packed RGBA image transported between SYS4 decoders, host surfaces, renderers, persistence, and tests; consumers do not depend on Sys4 merely to exchange decoded pixels. engine/Age.Engine/Model/SurfaceContracts.cs owns neutral surface fill/copy requests and the black-fade direction shared by VM presentation, graphics hosts, Godot, and tests. engine/Age.Engine/Model/InputContracts.cs owns neutral ADV auto-wait state and fullwidth text-edit request/result records shared by input hosts, timing policy, VM dispatch, Godot, and tests. engine/Age.Engine/Model/AdvPresentationContracts.cs owns neutral ADV wait-indicator configuration shared by VM dispatch, retained presentation, hosts, Godot, and tests. engine/Age.Engine/Model/DiagnosticContracts.cs owns the neutral synchronous diagnostic message transported between VM dispatch, diagnostic hosts, Godot, and tests.

engine/Age.Engine/Model/GfxState.cs retains cross-domain retained-graphics coordination. engine/Age.Engine/Model/GfxState.Contracts.cs owns its public render, transition, diagnostic, persistence, animation, numeric-glyph, and handle-range contracts. engine/Age.Engine/Model/GfxState.Surfaces.cs owns surface resource/color-key state, created/reloadable classification, movie stop-time metadata, render-target/tile configuration, and surface lifecycle operations. engine/Age.Engine/Model/GfxState.RetainedObjects.cs owns the retained-object record and registry/index, range-transform state, object creation/query/clone/erase and draw binding, plus numeric-glyph object generation. engine/Age.Engine/Model/GfxState.Animation.cs owns the shared animation clock, object color/source-cell/matrix/cyclic channels, animation control and forced completion, and the interpolation helpers consumed by retained-scene sampling. engine/Age.Engine/Model/GfxState.Presentation.cs owns surface/movie transition queues, presentation activity and click-skip logic, diagnostics and dirty-reason accounting, and visible retained-scene snapshots.

engine/Age.Engine/Vm/VirtualMachine.cs retains VM execution lifecycle, cross-domain state, and the proven top-level opcode dispatcher; Step now contains only label grouping, domain routing, and the unknown-op fallback. Its partial-class companion engine/Age.Engine/Vm/VirtualMachine.Audio.cs owns VM audio state, BGM restart semantics, and the BGM/voice/SFX/mixer opcode handler; Step retains the audio labels and routes that family into the handler. engine/Age.Engine/Vm/VirtualMachine.Movie.cs owns modal/asynchronous/ positioned movie playback, movie surface metadata/activity queries, and movie-mask transition dispatch; Step likewise retains and routes the movie labels. engine/Age.Engine/Vm/VirtualMachine.Surface.cs owns per-script reload-policy reset/configuration, surface allocation/loading, texture binding and sizing, mutable surface fill/copy, render-target control, and individual/transient surface release; its labels remain at their existing dispatcher positions around the retained numeric-glyph and object cases. engine/Age.Engine/Vm/VirtualMachine.RetainedObjects.cs owns retained-object registry queries, default-slot and geometry mutation, direct and range transforms, clone, and erase dispatch; animation, surface, ADV-binding, and presentation labels remain in their respective dispatcher groups. engine/Age.Engine/Vm/VirtualMachine.Animation.cs owns retained spritesheet and color channels, timed and cyclic transforms, per-object animation control, frame-time sampling, and the shared animation-clock opcode handler. engine/Age.Engine/Vm/VirtualMachine.Presentation.cs owns queued surface-alpha transitions, frame and object-range publication, skip-aware blocking fades/crossfades, foreground-transition waits, and graphics command-queue clear. engine/Age.Engine/Vm/VirtualMachine.AdvText.cs owns live ADV text emission, layout/cursor/wait-indicator state, text style and glyph-delay control, direct surface-string and retained numeric-glyph rendering, and retained text/wait-object bindings; text history and input/skip/auto services remain separate. engine/Age.Engine/Vm/VirtualMachine.TextHistory.cs owns history recording control, metadata append/navigation, retained history rendering, metadata/voice lookup, and history backlog clearing. engine/Age.Engine/Vm/VirtualMachine.AdvServices.cs owns persistent/active message-skip control, read-skip settings and queries, auto-message state/timing, and per-message voice/skip reset opcode dispatch; shared state and refresh helpers remain in the VM coordinator because live text and input paths also consume them. engine/Age.Engine/Vm/VirtualMachine.Input.cs owns blocking ADV waits, hotspot registration/arming, cursor resources and virtual position, raw mouse/joystick callback registration and dispatch, action polling, and physical-input mapping; public host-thread input entry points and shared synchronization remain in the coordinator. engine/Age.Engine/Vm/VirtualMachine.Timing.cs owns the monotonic-time query, host sleep, relative timed-callback schedule construction, deadline/catch-up selection, and callback resumption opcode handler. engine/Age.Engine/Vm/VirtualMachine.Persistence.cs owns catalog-unlock lookup, numbered save/load and nested restore continuation, metadata/copy/delete, thumbnail persistence, and shared-profile integer/string opcode dispatch; capture/apply helpers and persistent coordinator state remain in VirtualMachine.cs. engine/Age.Engine/Vm/VirtualMachine.MemoryCollections.cs owns string byte length, addressed lookup/copy, inline arrays, rectangle search and stable index sorting, bounded integer queues/stacks, bit/range operations, and native-style random-modulo dispatch; shared storage/address helpers remain in the coordinator. engine/Age.Engine/Vm/VirtualMachine.ControlFlow.cs owns local jumps/calls/returns, value-switch construction, ADV coroutine handler save/yield/resume, and bounded labeled-yield dispatch; process/root exit and cross-script lifecycle are routed separately. engine/Age.Engine/Vm/VirtualMachine.ScriptLifecycle.cs owns process/frame/root exit, native run-state compatibility, initial-root-run query, ordinary cross-script calls, mounted append autoruns, and preloaded script-slot load/call dispatch; frame execution, script-provider access, and shared lifecycle state remain in VirtualMachine.cs. engine/Age.Engine/Vm/VirtualMachine.Values.cs owns integer arithmetic, bitwise and comparison operations, string comparison/concatenation/conversion/move, native byte-length and CP932 operations, and the host-backed fullwidth string editor; shared operand storage, addressing, and native-string encoding remain in the coordinator. engine/Age.Engine/Vm/VirtualMachine.Diagnostics.cs owns diagnostic value/newline accumulation and synchronous show-and-clear opcode dispatch; shared diagnostic state and native-context formatting remain in the coordinator. engine/Age.Engine/Vm/VirtualMachine.RuntimeSettings.cs owns message-window alpha and system-menu enable/show delay opcode dispatch; reset/default initialization, public menu-state accessors, and host state remain centralized.

The disposable build/page-map-<SCENE>.jsonl files are produced by editor/development Godot runs and map runtime ADV page ordinals to their authoritative script offsets for tools/locate_page.py. Packaged exports have no repository output tree and write their automatic maps below user://diagnostics/page-maps instead.

Conventions

Three-way separation. Himegari_Game/ = untouched originals; extracted/ = game-derived data (regenerable, game-side); age-reimpl/ = everything we authored. The first two are consumed, never modified.
Tools never hard-code paths. tools/paths.py derives GAME_DIR, EXTRACTED, DATA1, BUILD, etc. from its own location. To point the tools at a different install, edit that one file. The whole tree can be relocated without touching any other tool.
Path references in docs are age-reimpl/-relative (e.g. tools/sys4load.py, build/text/dialogue.jsonl) unless they name a game/extracted path explicitly.
Authoritative script copies: where a script exists both as a loose .BIN in the game folder and under extracted/DATA1/, the game-folder copy (patch v1.03) wins. paths.scripts() resolves this automatically (overrides win).
build/ and extracted/ are disposable. build/ regenerates via tools/extract_phase2.py (or sys4load.py); extracted/ regenerates from the .ALF files with a separately obtained local extractor. bin/README.md records the optional local convention; no extractor binary is tracked. Safe to delete and rebuild; do not hand-edit.
Opcode knowledge is edited ONLY in vm-map/opcodes.toml (ABI + semantics + provenance + depends_on). Run tools/opcodes_build.py --build to regenerate both Python views (tools/age_opcodes.py, tools/age_opcodes_himegari.py), machine JSON (build/opcodes.json), reference (docs/opcode-reference.md), and coverage. --lint checks dangling deps / confidence-ceiling / vocabulary. Both Python modules are generated and must not be hand-edited.
Global-variable knowledge is edited ONLY in vm-map/globals.toml (name + category + value_domain + provenance). Run tools/globals_build.py --build to regenerate build/globals.json (sys4load labels) and docs/global-reference.md; --lint checks vocabulary / auto-shape≠high / dangling deps. Curated entries override the auto shape map (build/global-var-map.json). Discover story-flag candidates with tools/story_flags.py.
Encoding: all generated text is UTF-8 (source strings are cp932/Shift-JIS, decoded on extraction). Run Python as py -3.11 -X utf8.
The game install is a runnable unit — do not relocate AGE.EXE/*.ALF/DLLs relative to each other, or the game (and any Frida work) breaks.

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Project Structure

Conventions

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