RalliSport Challenge 2 — static recompilation

RalliSport Challenge 2 — static recompilation

A native PC build of RalliSport Challenge 2 (Xbox, NTSC, title 0x4D530039), made by statically recompiling the original executable with the xboxrecomp toolkit. Linux first; the Windows build is cross-compiled and so far tested under Wine.

No game data is included. You need your own copy of the game. The lifted C code is generated locally from your default.xbe and is not part of this repository either.

Demo

Prebuilt binaries

Releases have ready-built Linux (x86-64) and Windows (x64) packages. They contain the compiled program only, with the code translated from the game's executable built in, but no game data. Put your game files in a game folder next to the program, then start run.sh (Linux) or rsc2.exe (Windows).

• The Linux binary is built on an up-to-date Arch-based system and needs glibc 2.43+, SDL2, the Vulkan loader, glslang 16, SPIRV-Tools, libepoxy and OpenSSL 3. On other distributions, build from source.
• The Windows binary only needs a GPU driver with Vulkan 1.3.

What works

• Boot, intro movies, menus, profiles, career, stage loading and racing.
• Vulkan renderer at up to 6x internal resolution, with the game's own 16:9 widescreen mode, and frame rates above 60 (the game keeps time by the clock).
• Optional extras the original never had: MSAA, anisotropic filtering and ambient occlusion.
• Sound through SDL2: per-voice resampling, speaker mixdown, and the game's per-environment I3DL2 reverb (tunnels, forest, valleys, in the car).
• Keyboard and SDL game controllers, with rumble.
• A pre-game launcher for resolution, aspect ratio, GPU, display mode, frame rate limit, audio and controls.

Layout

Path	What
xboxrecomp/	The recompilation toolkit (v0.13.1, MIT) with this project's runtime work: Linux platform layer, NV2A Vulkan renderer, audio, input, kernel fixes.
rsc2/	The game project: entry point, hand-written overrides, launcher, build files, tools.
rsc2/config/	Function seeds and trace lists for the recompiler.
addr2func.py	Maps guest addresses to recompiled functions (debugging).

Building (Linux)

Needs CMake 3.20+, Ninja, a C11 compiler (GCC or Clang), Python 3, SDL2 2.0.18+, OpenSSL, libepoxy, the Vulkan headers and loader, glslc and glslang.

1. Put your game files in RalliSport2/ and copy its default.xbe to xboxrecomp/game_files/default.xbe.
2. Make the Python environment the recompiler runs in:

   python3 -m venv .venv
   .venv/bin/pip install capstone pefile numpy pytest
   

3. Generate the lifted C from your XBE (writes rsc2/src/recomp/):

   rsc2/regen.sh
   

4. Configure and build:

   cmake -S rsc2 -B rsc2/build -G Ninja
   ln -s ../../RalliSport2 rsc2/build/game
   ninja -C rsc2/build
   

5. Run:

   rsc2/run.sh
   

The launcher opens first; its settings are saved to ~/.config/rsc2/settings.ini. rsc2/run.sh --no-launcher skips it, --launcher brings it back when "Show at startup" is off. Any RECOMP_* variable set by hand overrides the saved setting.

rsc2/RUNNING.md has the keyboard map, the Windows cross-build and more of the runtime switches.

Credits and licences

• xboxrecomp by sp00nz and contributors — MIT (xboxrecomp/LICENSE).
• Noto Sans — SIL Open Font License 1.1 (rsc2/assets/fonts/OFL.txt).
• stb_truetype by Sean Barrett — public domain / MIT.

RalliSport Challenge 2 is a trademark of its respective owners. This project contains no game assets. In the source tree, the code translated from the executable is generated on your machine. There is one exception: the XDK library's XInputGetState, whose translated body rsc2/src/rsc2_overrides.c keeps so input can be recorded and replayed. The prebuilt release binaries contain the translated code compiled in, and are meant for owners of the game.