A modded version of RSDKv4 with fan game development in mind.

• Without the offical releases of Sonic 1 & Sonic 2, neither this project or the original RSDKv4 decompilation wouldn't be possible!

• You can get official releases of Sonic 1 & Sonic 2 from:

  • Windows

    • Via Steam, from Sonic Origins
    • Via the Epic Games Store, from Sonic Origins

  • iOS

    • Sonic 1, Via the App Store
    • Sonic 2, Via the App Store
    • A tutorial for finding the game assets from the iOS versions can be found here.

  • Android

    • Sonic 1, Via Google Play
    • Sonic 2, Via Google Play
    • Sonic 1, Via Amazon
    • Sonic 2, Via Amazon
    • A tutorial for finding the game assets from the Android versions can be found here.

  • However, if you want a project that was made with Scarlet in mind, check out it's companion project: RSDK-GDT 2.0, the first (and only) framework for the Retro Engine!

Even if your platform isn't supported by the official releases, you must buy or officially download it for the assets (you don't need to run the official release, you just need the game assets (if running the original games (Sonic 1 & Sonic 2 in this case)) ).

• Adds the video playback from RSDKv3
• Added all the features from every revision of RSDKv4 (REV00, REV01, REV02 & REV03)
• Removed the 2MBs Audio limit
• Re-adds the Disable Focus Pause that was missing from the Mobile versions of RSDKv4
• Extra functions for the scripting language (such as RSDKv5(U)-backported functions, alongside with RSDKv3 & RSDKv2/Sonic Nexus functions)

• Sonic 1
• Sonic 2
• Virtua Scarlet
• Another Sonic Adventure
• RSDK-GDT (Framework)

Both the original RSDKv4 decompilation project and this project uses CMake, a versatile building system that supports many different compilers and platforms. You can download CMake here. (Make sure to enable the feature to add CMake to the system PATH during the installation!)

In order to clone the repository, you need to install Git, which you can get here.

Clone the repo recursively, using: git clone --recursive https://github.com/Rubberduckycooly/Sonic-1-2-2013-Decompilation

If you've already cloned the repo, run this command inside of the repository: git submodule update --init

To handle dependencies, you'll need to install Visual Studio Community (make sure to install the Desktop development with C++ package during the installation) and vcpkg.

After installing those, run the following in Command Prompt (make sure to replace [vcpkg root] with the path to the vcpkg installation!):

• [vcpkg root]\vcpkg.exe install glew sdl2 libogg libvorbis --triplet=x64-windows-static (If you're compiling a 32-bit build, replace x64-windows-static with x86-windows-static.)

Finally, follow the compilation steps below using -DCMAKE_TOOLCHAIN_FILE=[vcpkg root]/scripts/buildsystems/vcpkg.cmake -DVCPKG_TARGET_TRIPLET=x64-windows-static -DCMAKE_PREFIX_PATH=[vcpkg root]/installed/x64-windows-static/ as arguments for cmake -B build.

• Make sure to replace each instance of [vcpkg root] with the path to the vcpkg installation!
• If you're compiling a 32-bit build, replace each instance of x64-windows-static with x86-windows-static.

Install the following dependencies: then follow the compilation steps below:

• pacman (Arch): sudo pacman -S base-devel cmake glew sdl2 libogg libvorbis
• apt (Debian/Ubuntu): sudo apt install build-essential cmake libglew-dev libglfw3-dev libsdl2-dev libogg-dev libvorbis-dev
• rpm (Fedora): sudo dnf install make gcc cmake glew-devel glfw-devel sdl2-devel libogg-devel libvorbis-devel zlib-devel
• apk (Alpine/PostmarketOS) sudo apk add build-base cmake glew-dev glfw-dev sdl2-dev libogg-dev libvorbis-dev
• Your favorite package manager here, make a pull request

Follow the android build instructions here.

Compiling is as simple as typing the following in the root repository directory:

cmake -B build
cmake --build build --config release

The resulting build will be located somewhere in build/ depending on your system.

The following cmake arguments are available when compiling:

• Use these on the first cmake -B build step like so: cmake -B build -DRETRO_DISABLE_PLUS=on

• RETRO_DISABLE_PLUS: Whether or not to disable the Plus DLC. Takes a boolean (on/off): build with on when compiling for distribution. Defaults to off.
• RETRO_FORCE_CASE_INSENSITIVE: Forces case insensivity when loading files. Takes a boolean, defaults to off.
• RETRO_MOD_LOADER: Enables or disables the mod loader. Takes a boolean, defaults to on.
• RETRO_NETWORKING: Enables or disables networking features used for Sonic 2's 2P VS mode. Takes a boolean, defaults to on.
• RETRO_SDL_VERSION: Only change this if you know what you're doing. Switches between using SDL1 or SDL2. Takes an integer of either 1 or 2, defaults to 2.

The multiplayer server requires Python 3.8 or later. You can download Python here. To use the server, open Command Prompt in the folder Server.py is located in, then run the command py -3 Server.py [local IPv4 address] [port] debug. You can find your local IPv4 address using the command ipconfig. Note that the C++ server found in the Server folder has been deprecated and no longer works. It has been kept in the repo for reference purposes.

You can find the FAQ here.

• st×tic for helping me fix bugs, tweaking up my sometimes sloppy code and generally being really helpful and fun to work with on this project.
• The Weigman for creating the header you see up here along with similar assets.
• Everyone in the Retro Engine Modding Server for being supportive of me and for giving me a place to show off these things that I've found.

Join the Retro Engine Modding Discord Server for any extra questions you may need to know about the decompilation or modding it.