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seedds abcfdf9215 The Legend of Zelda: Breath of the Wild (1.9.0) reaches the Shrine of Resurrection on the Mac, with a 60 fps cut; deferred texture binds read at execution

- Profile 01007EF00011E000 (SDK 20.5.22, NVN 55, main + subsdk0 + sdk): 19,592 shaders, all translated (chain bd3979ea9b3d).
- Loader applies DT_RELR relative relocations (SDK 20; main has 223,994); nvn_slots_got.py and DM_LOADHASH read them too.
- 60 fps: five rewriter cuts lower the GameFrameworkNx dynamic-interval floor from 2 to 1; ksys::VFR scales the
  logic time step by the interval (ratio 0.5 at 60 fps, falls back to 30 with ratio 1 when frames run long).
- Black 3D scene: nvnCommandBufferBindTexturesDeferred reads the handles at execution (bh_fresh); the engine
  records once and fills the handles later, so the lighting composite sampled texture 0.
- A texture attached at two colour slots is attached once (TBDR tile stores raced, albedo kept scattered tiles).
- Cube textures are 6-layer 2D arrays so tex_fit can bind cube-array views (1,512 shaders sample cube arrays).
- NVN functions other than command recording run on the per-thread host stack (Metal compiled on a small guest stack).
- Address-to-pool lookups use the last hit plus a sorted index (1,760 pools): submit time 21 ms -> 7 ms per frame.
- SDK 20: ARUID hook, audio renderer layout (Span GenerateCommand, new offsets, DeviceSink ID 0x14), nfp events,
  VR mode, seven-six-axis sensor, steady clock, launch parameter, stereo vision permission.
- Compressed render targets (BC4 via an RGBA16UI view) are skipped with a red line instead of a Metal abort.
- DM_KEYS takes frame numbers (f2500:A); TEXDUMP saves 2D-array layers; PASSDUMP prints skipped passes.
- NSP script skips empty NSP files and keeps one copy per DLC.

2026-10-16 16:07:15 +08:00

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Porting a Switch title: agent guide

These pages are for an agent asked to analyse a Switch NSP and port it with the native-execution approach of this repository and d2r-mobile: the game's own aarch64 code runs natively on Apple hardware, a rewriter patches only the instructions Apple's kernel cannot run, the host replaces Horizon system services, and NVN is reimplemented on Metal.

Everything here was learned on Diablo II: Resurrected (SDK ~12, NVN 53, the original target of d2r-mobile) and Super Mario Bros. Wonder (SDK 16.2.0, NVN 55, this repository; its update 1.2.1 uses SDK 16.2.12), then extended by Fire Emblem Engage (Unity, SDK 12.3.7), Metroid Dread (MercurySteam's engine, SDK 11.4.3) 13 Sentinels: Aegis Rim (Vanillaware's engine, SDK 11.4.3, the same sdk and movie module as Dread) Super Mario 3D World + Bowser's Fury (Nintendo EPD's sead / agl engine, SDK 10.4.0, NVN API 53) and The Legend of Zelda: Breath of the Wild (EPD's sead / ksys engine, SDK 20.5.22, DT_RELR relocations, update 1.9.0). Where titles differed, each is given; the next title will differ again, so treat every number below as "measure it, don't assume it".

Page	Covers
01-extract.md	Keys, NSP → NCA → ExeFS / RomFS, update NSPs, the workspace layout
02-survey.md	Static survey of a new title before touching the host: SDK version, imports vs. host hooks, SVCs, instructions to rewrite, NVN surface, data containers, Ghidra / REA setup
03-bringup.md	Getting the host to boot the game: the run loop, how to read the log, and a catalogue of every failure pattern met so far with its root cause and fix
04-graphics.md	NVN on Metal for a new title: object sizes, shader containers and keys, binding layouts, bindless textures, depth mode, index sizes, swizzle, transient render targets, the diagnostic switches
05-debugging.md	Recipes: crash reports, lldb scripts, Ghidra headless decompilation, objdump, memory growth, render-pass and texture dumps, on-device diagnostics, offline pipeline link checks

Ground rules

Bring your own files. Keys, NSPs and anything extracted from them stay in the user's workspace (~/<title>-work), never in the repository, never in a commit, never printed. Print key names and lengths only.
Measure, then change. Each fix in this repository started from a concrete observation (a crash address and its decompilation, a census over all shaders, a memory profile). Write the evidence into the code comment next to the fix, the way the existing code does; the next title will need it.
One repository, one profile per title. nxnative (first called smbw-mobile) started as a copy of d2r-mobile's generic parts. Title- or SDK-specific constants live in the game profile dm/games/<id>/ (dm/games/README.md). That covers program ID, known builds, modules, address-space partition, NVN driver tables, the shader tables and the app identity. The code reads the profile through game_profile.h (host) or dm/games/game.py (tools). Behaviour that fits only one title's code is gated by that title's build ID (dm_main_build()), never left on for every title. Some things are still built into the translator: the texture / sampler handle bases and the depth mode (see 04). dmsh_build.py refuses a profile whose bases differ from the translator's.
Keep the bilingual comment style of the code base (Chinese line, then the English line), and the 【红】 prefix for red log lines that mark something unimplemented or wrong.
Test where it runs. The Mac host (dm/host/dmhost) is the development loop; the iOS app reuses the same host and graphics code. Never claim something works on iOS without running it there.

Checklist for a new title

Run scripts/build_ipa_from_nsp.py on the title's NSP folder. With no profile for its title ID, it writes <NSP folder>/<title ID>_survey/survey.md:
- modules and build IDs, SDK version and components, engine and graphics API markers;
- RomFS containers;
- the rewrite-site census and imports vs. host hooks.
It extracts only the code modules plus a RomFS list.
Extract base (and update, if in scope) — 01. Finish the survey — 02. Write down: SDK version, NVN API version, module list, imports the host lacks, SVCs, instruction census, NVN loader pattern, shader containers.
Add a game profile dm/games/<title ID>/game.tsv, named after the base game's title ID (start from 010015100B514000/game.tsv: identity, build rows, modules; keep the memory / NVN values until they are measured) and build the host for it with make -C dm/host GAME=<id>.
Run the rewriter (DM_RULESET=native) and check its counts against insn_census.py.
Boot on the Mac and iterate on the failure catalogue in 03 until the game reaches its frame loop.
Extract and translate the shaders, find the binding layout by census, and get the first frame — 04.
Check memory over a minute of running (footprint, the host's memory report line); fix growth before moving on.
Input, audio, then the iOS bundle (d2r-mobile's dm/ios, RomFS inside the app).
Test on a phone: an unsigned IPA the user sideloads, switches through env.txt, results through Documents/log.txt (05). Several bugs only showed there (the command-buffer byte and the audio buffer size in 03, pipeline link failures in later levels in 04).
For a game update: extract it over the base game, diff the imports, carry the per-build addresses over, and rebuild the shader tables for both versions (01).

5.7 KiB Raw Blame History

Porting a Switch title: agent guide

Ground rules

Checklist for a new title

5.7 KiB

Raw Blame History