RetroArch is the reference frontend for the libretro API. Popular examples of implementations for this API includes videogame system emulators and game engines, but also more generalized 3D programs. These programs are instantiated as dynamic libraries. We refer to these as "libretro cores".
libretro is an API that exposes generic audio/video/input callbacks. A frontend for libretro (such as RetroArch) handles video output, audio output, input and application lifecycle. A libretro core written in portable C or C++ can run seamlessly on many platforms with very little/no porting effort.
While RetroArch is the reference frontend for libretro, several other projects have used the libretro interface to include support for emulators and/or game engines. libretro is completely open and free for anyone to use.
Latest Windows binaries are currently hosted on Themaister's homepage. Builds can also be found on the forum.
To reach developers, either make an issue here on Github, make a thread on the forum, or visit our IRC channel: #retroarch @ irc.freenode.org.
See our wiki. On Unix, man-pages are provided. More developer-centric stuff is found here.
- Cg/HLSL shaders: common-shaders
- More Cg shaders: Emulator-Shader-Pack
- Helper scripts to build libretro implementations: libretro-super
RetroArch attempts to be small and lean, while still having all the useful core features expected from an emulator. It is designed to be very portable and features a gamepad-centric UI. It also has a full-featured command-line interface.
In some areas, RetroArch goes beyond and emphasizes on not-so-common technical features such as multi-pass shader support, real-time rewind (Braid-style), video recording (using FFmpeg), etc.
RetroArch also emphasizes on being easy to integrate into various launcher frontends.
On Windows, RetroArch can run with only Win32 as dependency. On Linux, you need:
- GL headers
- X11 headers and libs, or EGL/KMS/GBM
RetroArch can utilize these libraries if enabled:
- nvidia-cg-toolkit
- libxml2 (GLSL XML shaders)
- libfreetype2 (TTF font rendering on screen)
RetroArch needs at least one of these audio driver libraries:
- ALSA
- OpenAL
- JACK
- SDL
- PulseAudio
To run properly, RetroArch requires a libretro implementation present, however, as it's typically loaded dynamically, it's not required at build time.
Console ports have their own dependencies, but generally do not require anything other than what the respective SDKs provide.
The default configuration is defined in config.def.h. It is not recommended to change this unless you know what you're doing. These can later be tweaked by using a config file. A sample configuration file is installed to /etc/retroarch.cfg. This is the system-wide config file.
RetroArch will on startup create a config file in $XDG_CONFIG_HOME/retroarch/retroarch.cfg if doesn't exist. Users only need to configure a certain option if the desired value deviates from the value defined in config.def.h.
To configure joypads, use the built-in menu or the retroarch-joyconfig command-line tool.
PC
Instructions for compiling on PC can be found in the wiki.