MVP Baseball 2005

A matching decompilation of MVP Baseball 2005 (GameCube, EA, 2005): C++ source that compiles back to a byte-identical copy of the retail main.dol. The aim is EA's code as EA wrote it. A PC port and mods will start from that code later.

This repository contains no game assets, no game code binaries and no official SDK files. You need your own copy of the game to build it.

The build reproduces the retail main.dol exactly. Discovery is done (docs/discovery.md); the imported libraries are in, and game code has just started, one small geometry library (geomlib, the collision shapes) at a time. Here a game function counts as exact only once it is also named and commented, in the same commit (docs/fidelity.md).

Configured units (configure.py, the source files that build from C): 227.

• 226 are marked matching and are linked in place of the assembly:
  • 209 library units (Nintendo SDK 96, C library 65, libm 33, libgcc 12, SN libsn 3), taken from public GameCube decomps (CREDITS.md);
  • 16 EA SND audio units, adapted from the NFS Most Wanted decomp;
  • 1 game unit, geomgroup.cpp (10 of 10 functions exact, named and commented).
• 1 game unit is configured but not linked yet: geomcone.cpp (7 of its 8 functions exact; the last, Precompute, is in docs/tried/).

Verified numbers, from CI's objdiff report on PR #59's head 226488a (2026-09-30):

	Exact	Total
Functions	1,127	24,150	4.67%
Code (bytes)	253,740	5,896,192	4.30%
Units complete	226	305

Of the exact functions, 17 are game code (geomgroup's 10, geomcone's 7), 2 EA's EAGL graphics library (viewport), 1,011 the SDK, C library and SN runtime, and 97 EA SND. Everything else, nearly all of the game, is still assembly. (objdiff counts 24,150 functions; dtk's split found 24,158.)

Live numbers: the progress page.

Targets

Id	Region	Revision	Status	Original SHA-1
GV4E69-rev0	USA	0	active	da6becdbea614d03c4b5eae9f8a0fb08e0a184dd

config/targets.json is the registry; each target's inputs are in config/<id>/.

Building

Needs Python 3 and ninja. On Linux and macOS, wibo is downloaded automatically to run the compiler and linker.

1. Put your disc image (ISO/GCM, RVZ, WIA, WBFS, CISO, NFS, GCZ or TGC) in orig/GV4E69-rev0/, or the extracted main.dol at orig/GV4E69-rev0/sys/main.dol.
2. python configure.py then ninja. The build must end with build/GV4E69-rev0/main.dol: OK.
3. ninja build/GV4E69-rev0/report.json measures the target.

To check every active target: for id in $(python3 -c 'from tools.targets import build_targets; print(*build_targets())'); do python3 configure.py --version "$id" && ninja; done.

Pinned tool versions are in configure.py; the build structure is dtk-template, whose documentation covers the other commands. The link uses SN Systems' ProDG linker (ngcld), as EA's build did (docs/compiler.md). A cloud session sets itself up with tools/cloud/setup.sh (tools/cloud/README.md).

CI and the progress site

.github/workflows/validate.yml builds every affected target in the private build image from mitsevox/mvp2005-build and publishes each measurement to the progress site on main. Pull requests publish nothing.

Contributing

The project owner is mitsevox, the sole merge authority. See CONTRIBUTING.md for the tiers, the task loop and the review checklist; agents start with AGENTS.md, whose Project section holds this repository's facts; docs/fidelity.md is the style guide. Open work is tracked in the issues.

Layout

Directory	Purpose
src/, include/	Game code under src/common/ and src/realcore/; the imported SDK, C library, SN runtime and EA SND under src/dolphin/, src/libc/, src/libm/, src/libgcc/, src/libsn/ and src/snd/
config/<id>/	One target's toolkit inputs, build.sha1, filemap.tsv and name_sources.tsv, the evidence behind every game name
orig/<id>/	Where the original goes locally; ignored by Git
build/	Generated; ignored
tools/, tests/	The kit tools, dtk-template's tools and the project's own: research (tools/research/), matching (tools/match/) and the cloud setup (tools/cloud/)
docs/	compiler.md (SN ProDG / GCC 2.95 and the flags), sdk.md, names.md, reference-builds/, filemap.md, and the process docs in docs/process/

Credits and licenses

Imported source is credited in CREDITS.md, and each imported file names its origin on its first line. The process and infrastructure come from the Tiger Woods PGA Tour 2004 decompilation. Built on decomp-toolkit and objdiff.