OpenEmu is an open-source multi-system video game emulator designed for

macOS macOS (; previously OS X and originally Mac OS X) is a Unix operating system developed and marketed by Apple Inc. since 2001. It is the primary operating system for Apple's Mac (computer), Mac computers. Within the market of ...

. It provides a plugin interface to emulate numerous consoles' hardware, such as the Nintendo Entertainment System,

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Game Boy The is an 8-bit fourth generation handheld game console developed and manufactured by Nintendo. It was first released in Japan on April 21, 1989, in North America later the same year, and in Europe in late 1990. It was designed by the same te ...

, and many more. The architecture allows for other developers to add new cores to the base system without the need to account for specific macOS APIs. Version 1.0 was released on December 23, 2013, after a lengthy beta testing period. Numerous incremental updates have been released since then, with plans to incorporate support for more consoles in future releases. Some of these in-development cores are available to download in an optional "experimental" cores build (released alongside the regular, "standard" version), containing support for arcade systems using MAME.

History

Beginnings

OpenEmu was first released on Wednesday, July 4th, 2007 as ''OpenNestopia'', a

Cocoa Cocoa may refer to: Chocolate * Chocolate * ''Theobroma cacao'', the cocoa tree * Cocoa bean, seed of ''Theobroma cacao'' * Chocolate liquor, or cocoa liquor, pure, liquid chocolate extracted from the cocoa bean, including both cocoa butter and ...

-port written by Josh Weinberg for then Mac OS X 10.4 Tiger of the NES/ Famicom emulator Nestopia (written by Martin Freij). Weinberg and his friend, Ben Devacel, began searching for more developers to port other emulators to macOS, which led to the name change to OpenEmu in 2009, to better describe the multi-system emulator.

1.0

OpenEmu 1.0 released on Monday, December 23, 2013 with 12 "cores" emulating Nintendo, Sega, NEC, and SNK's home, tabletop, and handheld consoles from the 3rd through 7th video game console generations. OpenEmu 1.0 needed Mac OS X Lion (10.7.x) to run. A Wednesday, October 15, 2014 (296 days later) midstream update to the OpenEmu library (1.0.4) would introduce

Stella Stella or STELLA may refer to: Art, entertainment, and media Comedy *Stella (comedy group), a comedy troupe consisting of Michael Showalter, Michael Ian Black and David Wain Characters *Stella (given name), including a list of characters with th ...

, a core emulating the 2600, a 2nd generation console from Atari.

2.0

Introduced on Wednesday, Dec 23, 2015, (exactly two years after 1.0) OpenEmu 2.0 was released. OpenEmu 2.0 began requiring a minimum of OS X El Capitan 10.11, dropping support for Mac OS X Lion (10.7.x) through OS X Yosemite (10.10.x). OpenEmu 2.0 introduced 16 new cores along with hundreds of bug fixes and lesser features. The new cores added several 2nd generation cores, support for optical media-based-image games, additionally emulating systems from

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, Mattel,

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, and Coleco. Another midstream update, ''2.0.6.1'', released Tuesday, Dec 19, 2017 (727 days after 2.0) added support for Mednafen's Sega Saturn branch, with a suggested quad-core i7 CPU to emulate.

2.1 and 2.2

OpenEmu 2.1 ( Friday, October 15, 2019, 675 days after version ''2.0.6.1''; "coincidentally," exactly 5 years after the ''1.0.4'' Stella update) was significant, not for any new cores, but for supporting

Metal A metal (from Greek μέταλλον ''métallon'', "mine, quarry, metal") is a material that, when freshly prepared, polished, or fractured, shows a lustrous appearance, and conducts electricity and heat relatively well. Metals are typi ...

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's visual API successor to OpenGL and OpenCl, giving OpenEmu significant gains in both performance and battery life. OpenEmu 2.2 ( Friday December 27, 2019, 63 days later) added support for a downstream, Metal-forked version of

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's GameCube

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, building on 2.1's foundation. This brings OpenEmu's number of supported cores to 31.

Limitations

32X Hybrid Games

As confirmed by the OpenEmu developers on their official subreddit, Sega 32X-CD hybrid games (versions of games that could use a 32X cartridge and Sega CD at once, such as '' Night Trap'', '' Corpse Killer'', and '' Fahrenheit'') are not supported. Users are prompted with a "This game requires the Sega 32X attachment" error if attempted.

GameCube Limitations

At present, GameCube emulation doesn't support Save States (due to continual updates breaking compatibility with saved states); users are encouraged to use in-game saves. OpenEmu GameCube emulation also does not support th
22 multi-disc GameCube titles
at present (despite the main Dolphin branch doing so).

Features

OpenEmu features a backend that uses multiple game engines while maintaining the familiar, native macOS frontend UI. It also uses modern macOS technologies such as

and

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. A unique feature of OpenEmu is its ROM library, which allows one to import ROM files and view them in a gallery type setting, similar to iTunes. Game info and cover art can be automatically added from OpenEmu's databases. OpenEmu includes the following features: * High-quality

(formerly

OpenGL OpenGL (Open Graphics Library) is a cross-language, cross-platform application programming interface (API) for rendering 2D and 3D vector graphics. The API is typically used to interact with a graphics processing unit (GPU), to achieve ha ...

) scaling, multithreaded playback, and other optimizations * Real-time 3D effects and image processing * Graphic filters to enhance display * Full-screen support * Ability to play multiple ROMs at once * Ability to scan attached disks for ROMs * Automatic downloading of game info and cover art * Ability to use custom cover art * Can play ROM hacks for multiple systems. * A fully featured library, supporting multiple views, collections (categories), and game ratings * Optional automatic organization of ROM files within the library folder * Full save state support, including automatic save states * Enhanced gamepad support for USB controllers and accessibility to

Bluetooth Bluetooth is a short-range wireless technology standard that is used for exchanging data between fixed and mobile devices over short distances and building personal area networks (PANs). In the most widely used mode, transmission power is limit ...

(including DualShock 3 controllers, DualShock 4 controllers, Xbox 360 controllers and Xbox One controllers) * Custom cores for custom systems (For systems like Wii)

Compatibility

* Default core plugin. ** Version 2.1 and lower must have custom system core.

Reception

Upon its 1.0 release, OpenEmu was positively received, and subject to much online press coverage, praising the software's UI, features, and ease of use. In particular, it was praised by the gaming community for " ringingthe idea of an emulator for a mainstream, general audience to reality". As of August 16, 2018, OpenEmu has been downloaded over 10,000,000 times since its version 1.0 release, making it one of the most popular multi-system emulators on macOS.

References

External links

* * {{github, OpenEmu Free software programmed in Objective-C Video game culture Arcade video game emulators MacOS-only free software Nintendo emulators Software using the BSD license Neo Geo emulators Game Gear emulators Free video game console emulators Multi-emulators