OpenEmu

OpenEmu is an open-source multi-system game emulator designed for macOS. It provides a plugin interface to emulate numerous consoles' hardware, such as the Nintendo Entertainment System, Genesis, Game Boy, 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.

OpenEmu
Original author(s)Josh Weinberg
Developer(s)OpenEmu Team
Stable release
2.2.1 / January 25, 2020 (2020-01-25)
Repository
Written inObjective-C
Operating systemmacOS
Size74.0 MB
Available inEnglish
TypeVideo Game Emulator
LicenseBSD
Websiteopenemu.org

Version 1.0 was released on December 23, 2013, after a lengthy beta testing period.[1] 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

openwas first released on Wednesday, July 4th, 2007 as OpenNestopia, a Cocoa-port written by Josh Weinberg for then Mac OS X 10.4 Tiger of the NES/Famicom emulator Nestopia (written by Martin Freij).[2] 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.[3]

1.0

OpenEmu 1.0 released on Monday, December 23, 2013 with 12 "cores" emulating Nintendo, Sega, NEC, and SNK's home, tabletop, and [[HanOpenEmu 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, a core emulating the 2600, a 2nd generation cosole 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 Sony, Mattel, Bandai, Magnavox, Milton-Bradley, and Coleco. Another midsteam 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, Apple'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 Dolphin's GameCube branch, 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.[4]

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 the [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 Cocoa and Quartz.[5] 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 Metal (formerly OpenGL) scaling, multithreaded playback, and other optimizations[6]
  • 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 (including DualShock 3 controllers, DualShock 4 controllers, Xbox 360 controllers and Xbox One controllers)
  • Custom cores for custom systems (For systems like Wii)

Compatibility
SystemCoreOE VersionmacOS compatibility
10.7–10.1010.11–10.14
Arcade (experimental version)M.A.M.E2.0.8
Atari 2600Stella1.0.4
Atari 5200Atari8002.0Does not appear
Atari 7800ProSystem2.0Does not appear
Atari LynxMednafen2.0Does not appear
ColecoVisionCrabEmu2.0Does not appear
Famicom Disk SystemNestopia2.0Does not appear
Game Boy / ColorGambatte1.0
Game Boy AdvancemGBA1.0
GameCube** Dolphin 2.2 Does not appear
Game GearGenesis Plus GX1.0
IntellivisionBliss2.0Does not appear
Neo Geo Pocket / ColorMednafen1.0
Nintendo 64Mupen64Plus2.0Does not appear
Nintendo Entertainment SystemFCEUX or Nestopia*1.0
Nintendo DSDeSmuME1.0
Odyssey² / Videopac+O2EM2.0Does not appear
PC-FXMednafen2.0Does not appear
Sega 32XPicoDrive1.0
Sega CD / Mega-CDGenesis Plus GX2.0Does not appear
Sega Genesis / Mega DriveGenesis Plus GX1.0
Sega Master System / Mark IIIGenesis Plus GX1.0
Sega SaturnMednafen2.0.6/2.0.6.1Does not appear
Sega SG-1000Genesis Plus GX2.0Does not appear
Sony PlayStationMednafen2.0Does not appear
Sony PlayStation PortablePPSSPP2.0Does not appear
Super Nintendo Entertainment Systemhigan or Snes9x*1.0
TurboGrafx-16 / PC Engine / SuperGrafxMednafen1.0
TurboGrafx-CD / PC Engine CDMednafen2.0Does not appear
VectrexVecXGL2.0Does not appear
Virtual BoyMednafen1.0
WonderSwan / ColorMednafen2.0Does not appear

* Default core plugin.[7]

** 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.[8][9][10][11] In particular, it was praised by the gaming community for "[bringing] the idea of an emulator for a mainstream, general audience to reality".[12]

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.[13]

See also
  • List of video game emulators

References
  1. https://github.com/OpenEmu/OpenEmu/releases
  2. "OpenNestopia".
  3. "The Archive - An Emulator for the Rest of Us—How OpenEmu Changes Everything".
  4. https://www.reddit.com/r/OpenEmu/comments/3zwu0t/32x_cd_support/
  5. "MacScene Listing".
  6. "Create Digital Motion".
  7. "OpenEmu Wiki - Home". GitHub. Retrieved 16 August 2018.
  8. Thorin Klosowski (2013-12-24). "OpenEmu Emulates Nearly Every Classic Console on Mac". Life Hacker. Retrieved 2014-04-10.
  9. Alex Heath (2013-12-26). "OpenEmu Is The Ultimate Old School Game Emulator For OS X". Cult of Mac. Retrieved 2014-04-10.
  10. Andrew Cunningham (2013-12-28). "ArsTechnica OpenEmu Hands On". Ars Technica.
  11. Sean Hollister (2013-12-28). "Play classic video games in style with OpenEmu for Mac". The Verge.
  12. "OpenEmu feature on The Archive".
  13. "Github OpenEmu Release Download Stats".
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