swos-port is an unofficial C++/SDL port of the PC DOS version of Sensible World of Soccer 96/97. The project combines gradually rewritten, idiomatic C++ code with a generated virtual-machine translation of the original game routines. This allows behavior to be preserved while systems are converted and tested one piece at a time.

Windows is the primary development platform. An Android project also exists, but the Windows Visual Studio and Meson builds are the actively maintained desktop build paths.

Project status

This is a development project rather than a finished drop-in replacement. Much of the game is playable, and the core match/gameplay code has been converted to idiomatic C++. Conversion and cleanup of the remaining game systems are ongoing. Some routines are still mechanically generated from swos/swos.asm; these are intended to be replaced with idiomatic implementations while preserving original behavior.

Behavioral compatibility is checked with frame-by-frame recordings captured from DOS SWOS. The test harness replays the same inputs and compares important game state against the recording, making subtle simulation drift detectable long before it becomes visually obvious.

Requirements

For the current x64 Windows build:

Visual Studio 2022 with the Desktop development with C++ workload;
Python 3.8 or newer;

Python packages required by the asset compiler:

python -m pip install -r assets/requirements.txt

Meson 1.3+ and Ninja, only when using the Meson build:
```
python -m pip install meson ninja
```

The patched PyTexturePacker used by the asset pipeline is vendored in 3rd-party/PyTexturePacker. Other headers, import libraries, and runtime DLLs used by the Windows projects are also kept under 3rd-party/ and dll/.

To copy generated atlases into the game data directory automatically, define SWOS_DIR before building. The asset compiler deploys them to %SWOS_DIR%\assets and overwrites older atlas files.

See the complete build documentation for details and optional development tools.

Building with Visual Studio

Open:

project/vc++/swos-port.sln

Select x64 and either Debug or Release, then build the solution. The solution automatically:

generates the ida2asm token lookup;
builds an optimized ida2asm converter;
translates swos/swos.asm into VM-backed C++ files;
compiles menu definitions;
generates animation tables;
rebuilds sprite and pitch assets when their inputs change;
builds the game and test executables.

The game executable is written below bin/x64/. Intermediate and generated files are kept below tmp/.

Packaging the Windows demo

The resulting archive is an unfinished development demo. Its graphics, audio, data, and other content are placeholders for testing the port; it is not the final game or a finished release.

After building x64 Release, create a self-contained package from the checked-in placeholder data archive with:

python tools\packageWindows.py --demo-data-archive assets\demo-data.zip

The manually dispatched GitHub Actions workflow creates the same self-contained demo zip; it does not run for pushes or pull requests. See Windows deployment for contents, provenance, and package options.

Building with Meson

Run these commands from an x64 Native Tools Command Prompt for Visual Studio:

meson setup tmp\meson-debug --backend=ninja --buildtype=debug
meson compile -C tmp\meson-debug

meson setup tmp\meson-release --backend=ninja --buildtype=release
meson compile -C tmp\meson-release

Meson performs the same code, menu, animation-table, and asset generation stages as the Visual Studio solution. Its generated files and executables remain inside the selected build directory.

One switchable Visual Studio solution from Meson

Meson's VS-lite backend creates separate Ninja trees behind one Visual Studio solution:

meson setup tmp\meson-vs --genvslite vs2022

Open tmp\meson-vs_vs\swos-port.sln. Its configuration selector contains debug, debugoptimized, and release; switching between them does not require closing Visual Studio.

Use the installed meson.exe command for this operation. Invoking Meson through python -m mesonbuild.mesonmain is not compatible with the VS-lite generator in current Meson releases.

Running the game

Development builds normally use data from a legally obtained copy of SWOS. Select its directory with:

swos-port.exe --swos-dir=<path-to-swos>

The self-contained Windows demo package instead includes the checked-in placeholder data described in the deployment documentation, so it does not need a separate SWOS installation.

Run the executable with --help to see the command-line options supported by the current build. Runtime DLLs must either be beside the executable or available through PATH; the checked-in Visual Studio debugger setup already supplies the normal development environment.

Tests

The Visual Studio solution builds the tests project alongside the game. A typical x64 Release invocation is:

$env:PATH = "$(Resolve-Path dll\x64\Release);$(Resolve-Path dll\x64);$env:PATH"
tmp\tests-x64-Release\testsRelease.exe --swos-dir=<path-to-swos>

The test executable supports selecting individual suites and cases. Important suites include:

frame-by-frame recorded-game compatibility tests;
SWOS data-layout and generated-table checks;
menu and menu-snapshot tests;
commentary, controls, file-selection, and joypad tests.

There are also Python tests for the menu and animation-table generators and a generated ida2asm token-lookup tester. See docs/tests.md for commands, debugger behavior, snapshot review, and recorded-data details.

Repository layout

Path	Purpose
`src/`	Game, platform, rendering, audio, input, and converted C++ code
`swos/`	SWOS disassembly input and `ida2asm` symbol/conversion rules
`ida2asm/`	IDA assembly-to-C++/assembly converter
`mnu2h/`	Menu-definition compiler
`assets/`	Source sprites, pitches, metadata, and asset compiler
`tests/`	C++ test harness, mocks, recorded games, and test projects
`3rd-party/`	Vendored headers, libraries, and patched PyTexturePacker
`project/vc++/`	Main Visual Studio solution and projects
`docs/`	Build, architecture, reverse-engineering, and subsystem notes
`tools/`	Supporting conversion, editor, and maintenance tools
`tmp/`	Generated and intermediate files; not source-controlled

Documentation

Legal notice

This is an unofficial fan project and is not affiliated with Sensible Software or the current owners of the Sensible World of Soccer name and game assets. Use data files from a legally obtained copy of the game.

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