Static recompilation and runtime toolkit for Nintendo GameCube, Wii, and Wii U executables.
(The first recompiler that really works)
NWiiRecomp translates Nintendo Wii/GameCube (.dol, .elf) and Wii U (.rpx, .rpl) executables into native C++ code. The output is a standalone executable that runs natively without instruction-level emulation. Hardware interactions are handled by a High-Level Emulation (HLE) runtime layer.
Note: The recompiler and runtime are designed to be universal. We are currently using Need For Speed: Hot Pursuit 2 (GameCube) and Silent Hill: Shattered Memories (Wii) as primary testing targets.
Latest Update: Need For Speed (GameCube) is now successfully booting up to the main menu!
NWiiRecomp/
├── nWiiAnalyzer/ — DOL/ELF parser and function boundary analyzer
├── nWiiRecomp/ — Offline static recompiler (PPC → C++)
├── nWiiRuntime/ — Cross-platform runtime + HLE library
└── nWiiStudio/ — GUI debugging and inspection tool (Raylib + ImGui)
- Full DOL section parsing.
- Recursive disassembly from entry point.
- Branch analysis for function boundary discovery.
- Vtable and jump table pointer recovery.
- Heuristics for OS dispatch stubs (via
lis/addipatterns).
- Translates PowerPC 750CL instructions to C++.
- Implements core integer, logic, floating point, branch, and SPR instructions,
including the time base (
mftb) and decrementer (mtdec/mfdec). - Implements paired-singles (SIMD) with GQR-based quantization scales mapped to C++ intrinsics.
- Tail-call detection and
goto-based local branch inlining. - Mid-function entry point dispatch via
switch(ctx.pc). - Per-game HLE hooks from
[hle_hooks]in the config TOML; the recompiler itself contains no game-specific addresses. - Functions that are all zeroes in the DOL (filled with code at runtime) are routed to the runtime interpreter instead of being recompiled.
- Optional per-function call tracing, enabled at run time with
NWII_TRACE_CALLS=1.
- Configuration: Per-game TOML profiles via
tomlplusplusfor target platform, HLE hooks, and input. - Interpreter fallback: A PPC750 integer interpreter executes code that does not exist in the DOL image (arena-clear helpers copied to low memory, trampolines, streamed overlays), then hands control back to recompiled code.
- Interrupts: PI interrupt controller with the Dolphin
INT_CAUSE_*bit layout dispatched into the guest__OSInterruptTable; decrementer exceptions driveOSAlarm. - Hardware MMIO: Register-level emulation of VI, DI (drive commands with DMA from a virtual disc), SI (joybus protocol with controller ID, origin, and polling), EXI (RTC/SRAM chip with valid checksums), DSP mailboxes, AI, MI, and the Wii IPC (Starlet) interface.
- IOS HLE: /dev/di, /dev/fs (virtual NAND with SYSCONF and settings), /dev/es, /dev/stm, /dev/usb served through a fd-based kernel, reachable both from IOS_* library calls and from the raw HW IPC ring.
- Virtual disc: Direct reads from extracted game dumps (
sys/+files/), WBFS, and ISO images. - Input: Selectable modes in
[input]: gamepad as Classic/GC pad, gamepad with stick- or gyro-assisted pointer, full tilt control with sensitivity setting, smartphone as Wiimote over UDP, keyboard and mouse. - GX Graphics: Structure tracking and WGPIPE ring-buffer parsing.
- Memory: DOL loading and virtual memory mapping; GC and Wii low-memory layouts (arena, FST, BI2, console type) set up per platform.
- Wii U / Cafe OS: Initial RPX loading, ELF parsing, and Latte GPU PM4 packet handling.
- Headless mode:
NWII_HEADLESS=1runs without a window for automated boot testing and log capture.
- Raylib + ImGui-based GUI
- DOL file browser and loader
- Function list panel with address and instruction count
- Disassembly viewer (raw PPC hex + decoded mnemonic)
- Basic memory map view
- Settings & Config Integration: Direct integration with
recomp_config.tomlto manage paths cleanly. - Thematic Themes: Includes "Nintendo" theme (GameCube Indigo / Wii aesthetic) for a polished user experience.
Requirements: CMake 3.20+, a C++20 compiler, internet access (Raylib is fetched automatically).
cmake -B build
cmake --build build -j$(nproc)# 1. Analyze and recompile the game (paths and options come from the TOML)
./build/nWiiRecomp/nwiirecomp config.toml
# 2. Build the generated project
cd export
cmake -B build
cmake --build build -j12
# 3. Run with the extracted game directory
cd ..
./export/build/<ProjectName> path/to/extracted-game config.tomlThe recompiler outputs a self-contained export/ directory containing the
generated sources and a copy of nWiiRuntime. It can be built independently
without the rest of this repository. Delete export/ (including its build/)
before regenerating so no stale sources survive.
Useful environment variables:
NWII_HEADLESS=1 # run without a window, log-only (boot debugging)
NWII_TRACE_CALLS=1 # print every recompiled function entry- N64Recomp — Original inspiration for the static recompilation approach
- Dolphin Emulator — Huge thanks for the endless hardware documentation, GX/DSP accuracy, and HLE inspiration!
- Cemu — Reference for Cafe OS RPL imports, hardware emulation, and GX2 to Vulkan translation.
- Decaf-emu — Great resource for RPX/RPL loaders and Cafe OS kernel/syscalls.
- WiiUBrew — Excellent Wii U GX2 and Cafe OS documentation.
- CafeGLSL — Open-source shader compiler alternative, crucial for understanding GX2 shaders.
- rpl2elf — Useful for RPX/RPL to ELF conversion and parsing.
- GhidraRPXLoader — RPX loader logic.
- WiiBrew — Wii hardware and software documentation
- YAGCD — Yet Another GameCube Documentation — Low-level GC/Wii CPU and hardware reference
- PowerPC 750CL User's Manual — Official ISA reference
License. See LICENSE for details.
© 2026 Volodymyr Vovchok.
Disclaimer: This project contains no copyrighted Nintendo code, SDKs, or game data. You must provide your own legally obtained game executables.