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Case study

LEGO Island, portable: a multi-platform port of the decompiled source

Adapts the LEGO Island decompilation into a portable build for desktop, mobile, console, DOS and Web targets. Windows-only subsystems are replaced with SDL3, miniaudio, iniparser and a custom Direct3D Retained Mode re-implementation, while core gameplay is meant to stay unchanged. It ports reconstructed source rather than checking byte-identical binaries, so it is distinct from the exact-rebuild decompilation case.

Requirements and limitations

  • README describes a portable version of English LEGO Island 1.1 built on isledecomp/isle, aiming at platform independence without gameplay changes or rewrites for their own sake, and the contributor guide accepts LEGO1 changes mainly when they serve platform compatibility. Light modding goes through extensions, which in the reviewed tree include multiplayer, a third-person camera and asset loaders. The status table lists Windows, macOS, Linux, FreeBSD, DOS, Web, iOS, Android, Xbox One, PlayStation Vita, Nintendo Switch and Nintendo 3DS.
  • An existing copy of LEGO Island is required. The guided installer asks for the retail CD-ROM or a disc image made from it and says any 1.0 or 1.1 retail version in any language works; its optional HD audio pack is limited to English 1.1. The installer describes the isle.pizza Web build as streaming the game without a local disc; this review did not examine what that site serves or on what basis.
  • Builds use CMake 3.25+ with a C++17 compiler; by default CMake fetches SDL3 and iniparser, and libsmacker and miniaudio are submodules. README points to the CI workflow instead of a separate build guide; that workflow uses MSVC, MinGW, macOS/Linux toolchains and platform SDKs such as Emscripten, devkitPro, VitaSDK, DJGPP and Android, and the desktop settings tool needs Qt 6. Release downloads are continuous builds of master, which README warns may regress.
  • The reviewed CI checks formatting and configures, builds and packages each platform target; it does not run the game or compare its behavior with the original. The per-platform status entries are CI badges, not gameplay-parity results. Kaitai Struct descriptions document save, animation, world-database and texture formats. This collection did not build or run the port.
  • The repository carries LGPL-3.0; bundled and fetched third-party libraries keep their own terms, and the original game data, LEGO trademarks and the bitmaps the installer takes from the original setup program retain separate rights. The reviewed sources establish no AI or REA attribution.

About this entry

Type
Case study
Category
Independent reconstruction cases
Relationship
Independent reconstruction project
Targets
Game

Sources reviewed

The description was reviewed against primary sources. This does not establish runtime testing, security auditing or verified compatibility.

Primary sources

  1. README.md GitHub · isledecomp/isle-portable · Revision d0bf04f
  2. CONTRIBUTING.md GitHub · isledecomp/isle-portable · Revision d0bf04f
  3. CMakeLists.txt GitHub · isledecomp/isle-portable · Revision d0bf04f
  4. .gitmodules GitHub · isledecomp/isle-portable · Revision d0bf04f
  5. .github/workflows/ci.yml GitHub · isledecomp/isle-portable · Revision d0bf04f
  6. installer/README.md GitHub · isledecomp/isle-portable · Revision d0bf04f
  7. installer/index.html GitHub · isledecomp/isle-portable · Revision d0bf04f
  8. docs/README.md GitHub · isledecomp/isle-portable · Revision d0bf04f
  9. LICENSE GitHub · isledecomp/isle-portable · Revision d0bf04f