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# boom3 - RetroBIOS

Type | libretro
Classification | game_engine
Source | https://github.com/libretro/boom3
Upstream | https://github.com/dhewm/dhewm3
Version | git
Profiled | 2026-03-23
Cores | boom3, boom3_xp
Systems | doom3
Verification mode | existence

Technical notes

Doom 3 source port based on dhewm3 (GPL Doom 3 engine). The core accepts .pk4 extensions (retro_get_system_info sets valid_extensions = "pk4"). Content is loaded directly from the .pk4 file path - the engine extracts the grandparent directory as fs_basepath (libretro.cpp:1097,1135-1136 via extract_directory called twice on info->path) and expects the standard Doom 3 directory layout with base/ containing pak000.pk4 through pak008.pk4. BASE_GAMEDIR is hardcoded to "base" (Licensee.h:58). The boom3_xp variant compiles with _D3XP defined, which passes "+set fs_game d3xp" at startup (libretro.cpp:538-544) to load the Resurrection of Evil expansion from a d3xp/ subdirectory alongside base/. The filesystem code (FileSystem.cpp:2125) scans for .pk4 files in the game directory and loads them in order, with higher-numbered paks overriding lower ones. The core requires OpenGL (RETRO_ENVIRONMENT_SET_HW_RENDER) and XRGB8888 pixel format. All required files are commercial Doom 3 game data, not engine firmware. No BIOS or system files are needed in the RetroArch system directory.

No BIOS or firmware files required. Generated on 2026-03-25T14:56:43Z