Harvest Moon: Back to Nature

A matching decompilation of Harvest Moon: Back to Nature (PlayStation, USA, SLUS_011.15). The C source builds the EXE and its 13 overlays byte for byte and, given your own copy of the disc, the whole disc image.

Building

docker build -t hmbtn-build .
docker run --rm --user "$(id -u):$(id -g)" -v "$PWD":/src:ro -v /tmp/hmbtn-build:/build \
    -v /path/to/disc:/disc:ro hmbtn-build bash -c 'cmake -S /src -B /build -G Ninja \
    -DORIGINAL_DISC=/disc/disc.bin && cmake --build /build --target check'

check compares every output with the original's SHA-1. Without -DORIGINAL_DISC it builds and checks only the 14 code binaries, which needs no game data.

Exceptions

Two things in the build are not compiled from source:

• One patched SDK word. The game links PSY-Q 4.7, but the only 4.7 release available has a later LIBCD.LIB: it is dated 2000-05-10, while every other 4.7 library is dated 2000-02-18. The game's copy of that library has one word different, a flag in BIOS_1's .data, so the build patches it back (sdk/patches.txt).
• Padding bytes. Where a file's data ends off a 4-byte boundary, the original build padded it. In the EXE, and in Sony's own library objects, that padding is zero. In 13 places in the overlays it is not: it holds leftover memory, mostly text with DOS line ends (\r\n, \t0; one is te\t0\r\n, the end of an assembler line .byte 0). No object holds these bytes, so each overlay lists them as GAP entries in its CMakeLists.txt.

License

CC0 1.0, covering this repository's own work only; tools/maspsx keeps its own license. The game and the PSY-Q SDK belong to their owners and are not included.