medusa is an emulator for running Nintendo DS, Game Boy Advance and Game Boy games. It aims to be faster and more accurate than many existing Nintendo DS and Game Boy Advance emulators, as well as adding features that other emulators lack. It also supports Game Boy and Game Boy Color games.
- A built-in GBA BIOS implementation, and ability to load external BIOS files. DS currently requires BIOS and firmware dumps[<sup>[2]</sup>](#dscaveat).
Requirements are minimal[<sup>[2]</sup>](#dscaveat). Any computer that can run Windows Vista or newer should be able to handle emulation. Support for OpenGL 1.1 or newer is also required, with OpenGL 3.2 or newer for shaders and advanced features.
Controls are configurable in the settings menu. Many game controllers should be automatically mapped by default. The default keyboard controls are as follows for GB and GBA:
The recommended way to build for most platforms is to use Docker. Several Docker images are provided that contain the requisite toolchain and dependencies for building mGBA across several platforms.
Note: If you are on an older Windows system before Windows 10, you may need to configure your Docker to use VirtualBox shared folders to correctly map your current `mgba` checkout directory to the Docker image's working directory. (See issue [#1985](https://mgba.io/i/1985) for details.)
After starting the Docker container, it will produce a `build-win32` directory with the build products. Replace `mgba/windows:w32` with another Docker image for other platforms, which will produce a corresponding other directory. The following Docker images available on Docker Hub:
This will build and install medusa into `/usr/bin` and `/usr/lib`. Dependencies that are installed will be automatically detected, and features that are disabled if the dependencies are not found will be shown after running the `cmake` command after warnings about being unable to find them.
If you are on macOS, the steps are a little different. Assuming you are using the homebrew package manager, the recommended commands to obtain the dependencies and build are:
To build on Windows for development, using MSYS2 is recommended. Follow the installation steps found on their [website](https://msys2.github.io). Make sure you're running the 32-bit version ("MSYS2 MinGW 32-bit") (or the 64-bit version "MSYS2 MinGW 64-bit" if you want to build for x86_64) and run this additional command (including the braces) to install the needed dependencies (please note that this involves downloading over 1100MiB of packages, so it will take a long time):
Please note that this build of medusa for Windows is not suitable for distribution, due to the scattering of DLLs it needs to run, but is perfect for development. However, if distributing such a build is desired (e.g. for testing on machines that don't have the MSYS2 environment installed), running `cpack -G ZIP` will prepare a zip file with all of the necessary DLLs.
To build using Visual Studio is a similarly complicated setup. To begin you will need to install [vcpkg](https://github.com/Microsoft/vcpkg). After installing vcpkg you will need to install several additional packages:
Note that this installation won't support hardware accelerated video encoding on Nvidia hardware. If you care about this, you'll need to install CUDA beforehand, and then substitute `ffmpeg[vpx,x264,nvcodec]` into the previous command.
You will also need to install Qt. Unfortunately due to Qt being owned and run by an ailing company as opposed to a reasonable organization there is no longer an offline open source edition installer for the latest version, so you'll need to either fall back to an [old version installer](https://download.qt.io/official_releases/qt/5.12/5.12.9/qt-opensource-windows-x86-5.12.9.exe) (which wants you to create an otherwise-useless account, but you can bypass temporarily setting an invalid proxy or otherwise disabling networking), use the online installer (which requires an account regardless), or use vcpkg to build it (slowly). None of these are great options. For the installer you'll want to install the applicable MSVC versions. Note that the offline installers do not support MSVC 2019. For vcpkg you'll want to install it as such, which will take quite a while, especially on quad core or less computers:
vcpkg install qt5-base qt5-multimedia
Next, open Visual Studio, select Clone Repository, and enter `https://github.com/mgba-emu/mgba.git`. When Visual Studio is done cloning, go to File > CMake and open the CMakeLists.txt file at the root of the checked out repository. From there, mGBA can be developed in Visual Studio similarly to other Visual Studio CMake projects.
If you have devkitARM (for 3DS), devkitPPC (for Wii), devkitA64 (for Switch), or vitasdk (for PS Vita), you can use the following commands for building:
medusa has no hard dependencies, however, the following optional dependencies are required for specific features. The features will be disabled if the dependencies can't be found.
<aname="dscaveat">[2]</a> Many feature are still missing on the DS, including savestates, cheats, rumble, HLE BIOS, and more.
<aname="flashdetect">[3]</a> Flash memory size detection does not work in some cases. These can be configured at runtime, but filing a bug is recommended if such a case is encountered.
<aname="osxver">[4]</a> 10.9 is only needed for the Qt port. It may be possible to build or running the Qt port on 10.7 or older, but this is not officially supported. The SDL port is known to work on 10.5, and may work on older.
If you are a game publisher and wish to license medusa for commercial usage, please email [licensing@mgba.io](mailto:licensing@mgba.io) for more information.
