Wing Commander II source reconstruction and SDL2 port

This project recreates the source of Wing Commander II as shipped in Wing Commander: The Kilrathi Saga (1996). The reconstructed game core is C, the ix audio library is C++, and the reference build uses Microsoft Visual C++ 4.1 under wibo to reproduce the original Win32 WC2.EXE.

A native SDL2 port is available for Windows, Linux, and macOS. It supports Kilrathi Saga data and has partial support for the original DOS game data.

No retail game data files are included.

Status

The reconstruction is incomplete: the source compiles and links as WC2.EXE, but significant implementation, mapping, and runtime work remains. make report compares 1,501 functions against the retail executable and averages 98.02% machine-code similarity, which measures reconstruction fidelity, not gameplay completeness.

The SDL2 port runs the title sequence, campaign intro, pilot database, save/load menus, cutscenes, and spaceflight, including firing, targeting, cockpit displays, and music. A DOS install plays its own AdLib music and synthesized OriginFX sound effects instead of the Kilrathi Saga streams and waves. The optional OpenGL renderer redraws space objects at output resolution while retaining the original indexed cockpit, HUD, and palette effects.

Screenshots

Captured through DREAMM at the game's original 320x200 resolution.

Download and run the SDL2 port

Download the archive for your platform from GitHub Releases. Extract its contents into an installed Kilrathi Saga or DOS Wing Commander II directory and keep the bundled runtime libraries beside the executable. Start it with that directory as the working directory:

# macOS or Linux
cd /path/to/WC2
./wc2-modern

# Windows PowerShell
cd C:\path\to\WC2
.\wc2-modern.exe

Fixes and features

The native port includes these fixes and optional features:

Options can be combined:

./wc2-modern --enhanced --joystick-rumble \
  --joystick-mode=4button-4axis

Enhanced renderer

The optional OpenGL renderer keeps the original indexed artwork, palettes, cockpit, HUD, and text while redrawing the ordered space-object layer at output resolution. The original software renderer remains the default; objects that cannot use the enhanced path fall back to it automatically. See the SDL2 port documentation for implementation details.

SDL2 port controls

The default joystick mode retains the original two-axis, two-button controls. The optional four-button modes add dedicated afterburner, target, weapon, navigation, autopilot, communications, and speed controls. See the SDL2 port documentation for the full gamepad, twin-stick, and HOTAS layouts.

Build from source

Clone the submodules first:

git submodule update --init --recursive

SDL2 port

Install a C/C++ compiler plus the SDL2 and LZO2 development packages, then run:

make -j modern

The executable is written to out-modern/wc2-modern (or out-modern/wc2-modern.exe on Windows). make run-modern launches it with Kilrathi Saga data in data/wc2-full; make run-modern-dos uses DOS data in data/dos.

Reconstructed Win32 build

The default target downloads and checksum-verifies the MSVC 4.1 package, then builds WC2.EXE, WC2.map, and compiler-generated assembly under out/. The original executable is not required to compile it:

make -j

To run it, provide a Kilrathi Saga disc image. The Makefile substitutes the reconstructed executable and launches it under DREAMM:

make run ISO=/path/to/kilrathi-saga.iso

Use make run-original for the retail executable in the same environment, and make debug to start DREAMM's debugger.

Reconstruction workflow

binary-comp is required only for comparison and verification commands:

python3 -m pip install "binary-comp[all] @ git+https://github.com/gg-sl-oss/binary-comp.git"
make compare-func FUNC=WinMain
make verify

These look for the retail executable at ../releases/win32/WC2.EXE; set ORIGINAL_SRC to point elsewhere.

Contributor references:

• compiler and flag evidence;
• matching patterns;
• disassembly export workflow;
• compilation-unit order;
• function naming policy;
• SDL2 port architecture; and
• release process.

Acknowledgements

Special thanks to:

• Origin Systems, who created Wing Commander II and developed its Kilrathi Saga port;
• Electronic Arts for publishing Wing Commander: The Kilrathi Saga;
• GOG for keeping Wing Commander 1 + 2 readily available;
• AllTinker for the W.C.A.T. overhaul, whose fixes and analysis of the DOS release have been valuable references;
• the WCDX project for its pioneering compatibility work on the Kilrathi Saga release; and
• Aaron Giles for the DREAMM emulator, used to run and study the original release, and ymfm, which powers the SDL2 port's AdLib emulation.

License

See LICENSE. OpenAI Codex and Anthropic Claude were used during the reconstruction.