ReGP

Stunt GP decompilation project, loosely based on the LEGO Island Decompilation.

Used version

This decompilation is based on the international PC version of the game with the following files and their sha256 checksums:

9c234da54a05392455a44b2d38482eefd303fd200a75c8703e32074989486214  config.exe
4a1d234ce1f095a427bb7f2f0174294b8c85a8fdbbc29b62a3863156b2f16a1b  StuntGP_D3D.exe
e4d2c2641c0028c6106de0e18d23ebd305d9af08fda4fbcc891540e92a1207a9  StuntGP.exe
2c1513cb0438180db0099850d5a449afe1ac5658c89348e49bb952386a872655  StuntGP_Glide.exe

Status

Only compilation of a dummy main.cpp through MSVC 6 works.

Building

For now, the code is only checked and compiled against MSVC 6.0, like in the original game.

Prerequisites

You'll need:

• CMake
• Microsoft Visual C++ 6.0. portable ver
  • the portable version with the PowerShell support was added as a git submodule. You can download it by issuing the git submodule update --init --recursive command.
• DirectX 6 SDK, a copy is included in the 3rdparty directory.

Nice to have:

• Compilation should always work under both CMD and PowerShell, but the primary command line I've used for the development is PowerShell 7.

Compiling

1. Open your favourite command prompt, cmd , or PowerShell will do.
2. From the MSVC600 directory, run VC98\Bin\VCVars32.BAT, or VC98\Bin\VCVARS32.ps1, depending on your command prompt, to set enviroment variables necessary for compilation.
3. Create build directory if it doesn't exists already.
4. cd to the build directory.
5. cmake .. -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=RelWithDebInfo
   • You can also use DCMAKE_BUILD_TYPE of RelWithDebInfo/Release/Debug
6. nmake - run it twice, as some things get compiled/referenced/whatever only on the second run.

Comparison

For comparison with the original files we're using the reccmp project:

1. Create originals directory
2. Copy your original .exxe file(s) to the originals directory
3. Create Python virtual env (once): python -m venv .venv
4. Enable venv: .\.venv\Scripts\activate.ps1 (or.bat if you're using CMD)
5. Install dependencies (once): pip install -r .\tools\requirements.txt
6. Update local reccmp user config: reccmp-project detect --search-path originals
7. cd to directory with build exe files
8. Update local reccmp build config: reccmp-project detect --what recompiled --search-path build
9. Compare original and recomp: reccmp-reccmp --target STUNTGP_D3D

Usage

In theory when enough work is done you could just put the compiled executables in the game directory and run them. Currently this is a very bad ise, as nothing works (yet).