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libretro/emulators/dxx-rebirth.yml
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emulator: dxx-rebirth
type: standalone
core_classification: game_engine
source: "https://github.com/dxx-rebirth/dxx-rebirth"
upstream: ~
profiled_date: "2026-10-04"
source_commit: "db1996a7fd18c7bf11c9b18b881aa4f11a84f017"
core_version: "git"
display_name: "Descent 1 & 2 (DXX-Rebirth)"
cores: [dxx-rebirth, d1x-rebirth, d2x-rebirth]
systems: [descent, descent2]
verification: existence
notes: |
DXX-Rebirth is a dual-engine source port of Descent 1 and Descent 2
built from the Parallax-released sources. The repository builds two
executables, d1x-rebirth and d2x-rebirth, sharing the similar/ tree
guarded by DXX_BUILD_DESCENT = 1 or 2.
Each build mounts its data via PhysFS. The game folder (defaulted to
the executable directory on Windows/macOS, DXX_SHAREPATH or
~/.d1x-rebirth / ~/.d2x-rebirth on Unix) is searched for the HOG and
PIG files; -hogdir on the command line adds another search path. On
startup similar/main/inferno.cpp mounts descent.hog (D1) or
descent2.hog / d2demo.hog (D2) via make_PHYSFSX_ComputedPathMount
(similar/main/inferno.cpp:471-476). If neither hog is found the engine aborts with
UserError "Could not find a valid hog file".
The size of the HOG picks the data edition (common/main/mission.h:58):
6856701 / 6856183 / 7261423 bytes = PC Descent 1 retail v1.4-v1.5 / v1.0
4492107 / 4494862 bytes = PC Descent 1 OEM v1.4a / v1.0
2339773 / 2365676 bytes = PC Descent 1 shareware v1.4 / v1.0
7456179 / 3370339 bytes = Mac Descent 1 retail / shareware
2292566 bytes = d2demo.hog v1.0 (D2 PC shareware)
4292746 bytes = D2 Mac shareware
6132957 bytes = D2 PC OEM v1.1
7595079 / 7107354 bytes = D2 PC full v1.1-1.2 / v1.0
7110007 bytes = D2 Mac full v1.1-1.2
For Descent 2 the engine also expects descent2.ham (binary tables) and
one of the PIG graphics families (groupa.pig / alien1.pig / alien2.pig
/ fire.pig / ice.pig / water.pig for retail, d2demo.pig for shareware)
plus the sampled sound bank (descent2.s11 for 11 kHz or descent2.s22
for 22 kHz; similar/main/piggy.cpp:79). Mac shareware additionally bundles exit.ham.
d2x.hog is the Descent 2: Vertigo expansion mission, probed in the
MISSION_DIR by similar/main/inferno.cpp:542 to toggle the "Vertigo Enhanced" title.
The movie libraries are named from three stems (intro, other, robots;
d2x-rebirth/main/movie.cpp:93-95) and a resolution letter: <stem>-h.mvl
is tried first, then <stem>-l.mvl (d2x-rebirth/main/movie.cpp:660,
672-677). A library that fails to mount is logged and skipped; the
game plays without movies.
Only the free PC shareware pair (desc14sw.tar.gz = descent.hog +
descent.pig; d2shar10.tar.gz = d2demo.hog/pig/ham) is redistributable;
the retail archives listed below are commercial GOG files.
files:
# ------ Descent 1 shareware (free) ------
- name: descent.hog
path: descent.hog
system: descent
category: game_data
required: false
size: 2339773
validation: [size]
description: "Descent 1 PC shareware v1.4 HOG"
variant_group: d1-hog
note: "freely redistributable (icculus.org/d2x/data/desc14sw.tar.gz)"
source_ref: "similar/main/mission.cpp:80; common/main/mission.h:67"
- name: descent.pig
path: descent.pig
system: descent
category: game_data
required: false
description: "Descent 1 PC shareware PIG (ships with desc14sw.tar.gz)"
source_ref: "common/main/fwd-piggy.h:55"
# ------ Descent 1 retail ------
- name: descent.hog
path: descent.hog
system: descent
category: game_data
required: false
size: 6856701
validation: [size]
description: "Descent 1 PC retail v1.5 HOG (GOG)"
variant_group: d1-hog
note: "commercial; alternative sizes 6856183 (v1.5 alt), 7261423 (v1.0), 7456179 (Mac retail)"
source_ref: "common/main/mission.h:61-64"
- name: descent.pig
path: descent.pig
system: descent
category: game_data
required: false
description: "Descent 1 PC retail PIG"
source_ref: "similar/main/piggy.cpp:69"
# ------ Descent 2 shareware (free) ------
- name: d2demo.hog
path: d2demo.hog
system: descent2
category: game_data
required: false
size: 2292566
validation: [size]
description: "Descent 2 PC shareware HOG"
variant_group: d2-hog
note: "freely redistributable (icculus.org/d2x/data/d2shar10.tar.gz)"
source_ref: "similar/main/mission.cpp:107-108; common/main/mission.h:71"
- name: d2demo.pig
path: d2demo.pig
system: descent2
category: game_data
required: false
description: "Descent 2 shareware PIG"
source_ref: "similar/main/piggy.cpp:73"
- name: d2demo.ham
path: d2demo.ham
system: descent2
category: game_data
required: false
description: "Descent 2 shareware HAM"
source_ref: "similar/main/piggy.cpp:75"
# ------ Descent 2 retail ------
- name: descent2.hog
path: descent2.hog
system: descent2
category: game_data
required: false
size: 7595079
validation: [size]
description: "Descent 2 PC full v1.1-1.2 HOG (GOG)"
variant_group: d2-hog
note: "commercial; alternative sizes 7107354 (v1.0), 7110007 (Mac full), 6132957 (OEM v1.1), 4292746 (Mac shareware)"
source_ref: "common/main/mission.h:73-76"
- name: descent2.ham
path: descent2.ham
system: descent2
category: game_data
required: false
description: "Descent 2 retail HAM (tables)"
source_ref: "similar/main/piggy.cpp:74"
- name: groupa.pig
path: groupa.pig
system: descent2
category: game_data
required: false
description: "Descent 2 retail default PIG (loaded by piggy_init_pigfile)"
source_ref: "similar/main/piggy.cpp:72; similar/main/inferno.cpp:689"
- name: alien1.pig
path: alien1.pig
system: descent2
category: game_data
required: false
description: "Descent 2 Alien-1 textures PIG"
source_ref: "similar/main/piggy.cpp:87"
- name: alien2.pig
path: alien2.pig
system: descent2
category: game_data
required: false
description: "Descent 2 Alien-2 textures PIG"
source_ref: "similar/main/piggy.cpp:88"
- name: fire.pig
path: fire.pig
system: descent2
category: game_data
required: false
description: "Descent 2 Fire textures PIG"
source_ref: "similar/main/piggy.cpp:89"
- name: ice.pig
path: ice.pig
system: descent2
category: game_data
required: false
description: "Descent 2 Ice textures PIG"
source_ref: "similar/main/piggy.cpp:91"
- name: water.pig
path: water.pig
system: descent2
category: game_data
required: false
description: "Descent 2 Water textures PIG"
source_ref: "similar/main/piggy.cpp:92"
- name: descent2.s22
path: descent2.s22
system: descent2
category: game_data
required: false
description: "Descent 2 22 kHz digital sound bank (default for retail)"
source_ref: "similar/main/piggy.cpp:79"
- name: descent2.s11
path: descent2.s11
system: descent2
category: game_data
required: false
description: "Descent 2 11 kHz digital sound bank (shareware/Mac default)"
source_ref: "similar/main/piggy.cpp:79"
- name: d2x.hog
path: missions/d2x.hog
system: descent2
category: game_data
required: false
description: "Descent 2: Vertigo expansion mission HOG"
source_ref: "similar/main/inferno.cpp:542"
- name: intro-h.mvl
path: intro-h.mvl
system: descent2
category: game_data
required: false
description: "Descent 2 intro cinematic (high-res)"
source_ref: "d2x-rebirth/main/movie.cpp:93-95 (movielib_files), 660 (name format); similar/main/titles.cpp:292 (intro.mve)"
- name: robots-h.mvl
path: robots-h.mvl
system: descent2
category: game_data
required: false
description: "Descent 2 robot briefings (high-res)"
source_ref: "d2x-rebirth/main/movie.cpp:93-95 (movielib_files), 660 (name format)"
- name: other-h.mvl
path: other-h.mvl
system: descent2
category: game_data
required: false
description: "Descent 2 misc cinematics (high-res)"
source_ref: "d2x-rebirth/main/movie.cpp:93-95 (movielib_files), 660 (name format)"
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