
sonic3air
Source and data to build Sonic 3 A.I.R. (Angel Island Revisited) and the Oxygen Engine
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Sonic 3 A.I.R. is a non-profit fan game project that provides source code including dependencies for "Sonic 3 - Angel Island Revisited," a fan-made remaster of Sonic 3 & Knuckles. The project is split into several different projects, including external dependencies, librmx libraries, Lemonscript language library, Oxygen Engine, and S3AIR-specific C++ code. To build for different platforms, refer to the readme files in the respective subdirectories of "Oxygen/sonic3air/build." External libraries and code used in this project include SDL2, libogg & libvorbis, zlib, libcurl, jsoncpp, GLEW, Sound chip emulation related code from Genesis Plus GX, Discord Game SDK, xBRZ upscaler shader code, and Hqx upscaler shader code & data files.
README:
Source code incl. dependencies for "Sonic 3 - Angel Island Revisited", a fan-made remaster of Sonic 3 & Knuckles.
Project homepage: https://sonic3air.org/
Sonic 3 A.I.R. is a non-profit fan game project. It is not affiliated in any way with SEGA or Sonic Team, the original creators of Sonic 3 and Sonic & Knuckles.
Sonic the Hedgehog is a trademark of SEGA. All copyrights regarding Sonic the Hedgehog, including characters, names, terms, art, and music belong to SEGA. All registered trademarks belong to SEGA and Sonic Team.
The developers of Sonic 3 A.I.R. have no intent to infringe said copyrights and registered trademarks. No financial gain is made from this project.
Any commercial use of this project without SEGA's explicit consent is strictly prohibited.
This repository is split into several different projects:
- The larger external dependencies (namely SDL2, Ogg/Vorbis, zlib) inside the "framework" directory. These are copies of the respective open source projects, with a few custom changes applied where needed - see the "how-to-build.txt" files in there for details.
- The librmx libraries that together with the external dependencies build a foundation for my own projects (S3AIR and my private stuff). This primarily consists of rmxbase, a collection of helper and utility classes, and rmxmedia, which is providing a basic game framework built on top of SDL2 & OpenGL.
- Lemonscript language library, with compiler and runtime environment for script execution.
- Oxygen Engine, the backbone game engine powering Sonic 3 A.I.R. This includes input, graphics, audio handling, and all the other game application stuff, as well as a simulation environment built around lemonscript that - as far as needed for the purposes of S3AIR - emulates aspects of Sega Genesis hardware. Note that Oxygen can be built as its own application (OxygenApp) that lacks the S3AIR C++ code.
- S3AIR-specific C++ code, scripts and data in the "Oxygen/sonic3air" directory. Yes, that's what it's named.
For information on how to build for different platforms, find the readme files in the respective subdirectories of "Oxygen/sonic3air/build":
- Windows: "_vstudio"
- Mac: "_xcode"
- Linux: "_cmake"
- Android: "_android"
- Web: "_emscripten"
- Switch: "_make" (unmaintained)
Additional platform ports:
External libraries and code used in this project:
- SDL2 - in "framework/external/sdl"
- libogg & libvorbis - in "framework/external/ogg-vorbis"
- zlib incl. minizip - in "framework/external/zlib"
- libcurl - in "framework/external/curl"
- Dear ImGui - in "framework/external/imgui"
- jsoncpp - in "librmx/source/rmxbase/jsoncpp"
- GLEW - in "librmx/source/rmxmedia/glew"
- Sound chip emulation related code from Genesis Plus GX - in "Oxygen/oxygenengine/source/oxygen/simulation/sound"
- Discord Game SDK - in "Oxygen/sonic3air/source/external/discord_game_sdk"
- xBRZ upscaler shader code - in "Oxygen/oxygenengine/data/shader" and once more in "Oxygen/sonic3air/data/shader"
- Hqx upscaler shader code & data files - in "Oxygen/oxygenengine/data/shader" and once more in "Oxygen/sonic3air/data/shader"
Thanks to all contributors!
Source code contributions by:
- Sappharad
- Heyjoeway
- Carjem Generations
- Ultracoolguy
- gl33ntwine
- Rinnegatamante
- MDashK
Remastered soundtrack by:
- G Spindash
Game scripts & other contributions by:
- Vinegar
- Thorn
- Legobouwer
- GFX32
- Dynamic Lemons
- HazelSpooder
- iCloudius
- D.A. Garden
- Alieneer
- 3Pills
- Elsie The Pict
- TheMushrunt
- mrgrassman14
Additional thanks:
- All contributors of the Sonic 3 / Sonic & Knuckles Disassembly (https://github.com/sonicretro/skdisasm), which has proven itself a valuable source of information on S3&K code
Here's the bad news: This repository isn't meant for direct distribution. If you have your own changes that you want to share with the world, create a fork of this repo, instead of making pull requests. I'd very much appreciate that as I really want to avoid having too much overhead with managing / reviewing code changes made by others. I'd rather use the time to continue with implementing my own ideas into the project.
Plus there's a second reason, and that's an important one for me as well: It's about code ownership and software licenses. It's much easier to use the librmx, lemonscript and Oxygen Engine code elsewhere under a different license than GPL if I don't have to ask a larger group of contributors whether they are okay with it. Because there are some plans for possible future projects using these codes as a foundation, maybe even commercial ones where GPL could make things complicated.
-- Euka
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