mirror of
https://github.com/Abdess/retroarch_system.git
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Every profile now has: - profiled_date: date of source code analysis - core_version: version from libretro-core-info .info files - display_name: human-readable name from .info files 260/260 profiles complete. 294/294 libretro cores covered. Standalone emulators (cemu, rpcs3, xemu, vita3k) versioned manually.
68 lines
3.3 KiB
YAML
68 lines
3.3 KiB
YAML
emulator: NXEngine
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type: libretro
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source: "https://github.com/libretro/nxengine-libretro"
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profiled_date: "2026-03-18"
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core_version: "1.0.0.6"
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display_name: "Cave Story (NXEngine)"
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systems: [cave-story]
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notes: |
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NXEngine is an open-source reimplementation of the Cave Story (Doukutsu
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Monogatari) engine by Studio Pixel. It is not an emulator but a source port
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that loads the original freeware game data directly.
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The core requires the original freeware Cave Story distribution placed in
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{system_dir}/nxengine/. When launched without a content file, it looks for
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Doukutsu.exe at that path (libretro.cpp:254-259). When launched with a .exe
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content file, it uses the parent directory of that file instead
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(libretro.cpp:244).
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At startup (main.cpp:66-90), the core opens Doukutsu.exe and extracts from
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it: ORG music files (extractorg.c), PXT sound effects (extractpxt.c), stage
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tile attributes (extractstages.c), bitmap graphics, and the wavetable
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(cachefiles.c:484). These are kept in memory, not written to disk.
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The data/ directory must exist alongside Doukutsu.exe with the full game
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asset tree: 30 root-level files (sprites, backgrounds, script tables),
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36 NPC sprite sheets in data/Npc/, and 333 stage files in data/Stage/
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(maps .pxm, tile attributes .pxa, entity lists .pxe, scripts .tsc, and
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tileset images via Prt*.pbm). The core verifies data/ exists by checking
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for data/npc.tbl (main.cpp:47-63).
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The core also reads endpic/ bitmaps for ending sequences, extracted from
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Doukutsu.exe at runtime (cachefiles.c:460-484).
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All required files ship in the datafiles/ directory of the libretro repo
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itself, since Cave Story is freeware. No separate BIOS or firmware is
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needed. The entire freeware distribution is the "system" requirement.
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sprites.sif has a compiled-in fallback (sprites_sif.h) and is the only
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data file that can be missing without a fatal error (cachefiles.c:515-521).
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Valid content extension: .exe (retro_get_system_info, libretro.cpp:96).
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files:
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- name: "Doukutsu.exe"
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system: cave-story
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description: "Cave Story freeware executable (data source for music, sfx, bitmaps, wavetable)"
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required: true
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size: 1478656
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md5: "38695d3d69d7a0ada8178072dad4c58b"
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sha1: "bb2d0441e073da9c584f23c2ad8c7ab8aac293bf"
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source_ref: "main.cpp:77-78 (opened for extraction), libretro.cpp:258 (existence check)"
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notes: "Placed in system/nxengine/. The core extracts ORG music, PXT sounds, stage tile attributes, BMP graphics, and wavetable.dat from this binary at each launch."
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- name: "data/npc.tbl"
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system: cave-story
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description: "NPC attribute table (entity behavior flags, HP, damage, display rect offsets)"
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required: true
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source_ref: "main.cpp:50 (existence check for data/ directory validation)"
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notes: "Located in system/nxengine/data/. The core uses this file to verify the data directory is present."
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- name: "data/"
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system: cave-story
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description: "Full game asset directory tree (399 files: sprites, NPC sheets, stage maps, scripts, backgrounds)"
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required: true
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source_ref: "cachefiles.c:38-480 (complete file list loaded at init)"
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notes: "Must contain root assets (Arms.pbm, MyChar.pbm, etc.), Npc/ (36 sprite sheets), and Stage/ (333 map/script/tileset files). All files from the original freeware release."
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