less_retarded_wiki/anarch.md

# Anarch

Anarch is a [LRS](lrs.ms)/[suckless](suckless.md) first person shooter [game](game.md) similar to [Doom](doom.md), written by [drummyfish](drummyfish.md). It has been designed to follow the LRS principles very closely and set an example of how games, and software in general, should be written.

Tge repo is available at https://codeberg.org/drummyfish/Anarch
 or https://gitlab.com/drummyfish/anarch. Some info about the game can also be found at the [libregamewiki](lgw.md): https://libregamewiki.org/Anarch.

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```

*screenshot from the terminal version*

Anarch has these features:

- It is completely **[public domain](public_domain.md)** [free software](free_software.md)/[free culture](free_culture.md) under [CC0](cc0.md), including all code and assets which were all made from scratch by drummyfish.
- It has extremely low hardware demands, fitting into **256 kb** (WITH assets) and requiring only about **32 kb of [RAM](ram.md)** and **50 MHz [CPU](cpu.md)**. [GPU](gpu.md)s need not apply.
- It is written in pure [C99](c.md) without any [dependencies](dependency.md) (not even the standard library). It uses no [dynamic heap allocation](dynamic_allocation.md) and no [floating point](float.md).
- It is **extremely portable**, written against a very tiny I/O layer. As such it has been ported to many platforms such as [GNU](gnu.md)/[Linux](linux.md), [BSD](bsd.md), [Pokitto](pokitto.md), browser [JavaScript](javascript.md), [Raspberry Pi](rpi.md) and many others.
- It is written in a [single compilation unit](scu.md) and without any [build system](build_system.md).
- It is created with only free software.
- It is well documented.

Gameplay-wise Anarch offers 10 levels and multiple enemy and weapon types. It supports mouse where available.

## Technical Details

Anarch's engine uses [raycastlib](raycastlib.md), a LRS library for advanced 1D [ray casting](ray_casting.md) which is often called a "pseudo 3D". This method was used by Wolf3D, but Anarch improves it to allow different levels of floor and ceiling which makes it look a little closer to Doom (which however used a different methods called [BSP](bsp.md) rendering).

The music in the game is [procedurally generated](procedural_generation.md) using [bytebeat](bytebeat.md).

All images in the game (textures, sprites, ...) are 32x32 pixels, compressed by using a 16 color subpalette of the main 256 color palette, and are stored in source code itself as simple [arrays](array.md) of bytes -- this eliminates the need for using [files](file.md) and allows the game to run on platforms without a [file system](file_system.md).

The game uses a tiny custom-made 4x4 bitmap [font](font.md) to render texts.

Saving/loading is optional, in case a platform doesn't have persistent storage. Without saving all levels are simply available from the start.

In the suckless fashion, mods are recommended to be made and distributed as [patches](patch.md).