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# Licar

Licar (short for libre car), also known as the best racing game ever made, is a fully public domain, free software and free culture 3D racing game by drummyfish, inspired mostly by the proprietary game Trackmania. Licar was made in similar fashion to Anarch (another major game by the same guy) but is a little more bloated: it is a fully 3D game made with small3dlib and tinyphysicsengine and although it's not the most minimalist piece of software under the sun, it is still very much KISS, extremely portable, not using any third party libraries etc. The git repo is currently at http://git.coom.tech/drummyfish/Licar; version 1.0 of the game was released on 25.06.2025 after 329 commits and didn't immediately receive as much Internet attention as Anarch because it wasn't "promoted" as much (the author no longer desires much attention for the creation, he feels he already has enough eyes on him). The development of Licar was conducted purely with free software (GIMP, Blender, GNU/Linux, vim, ...) and relatively old computers (mainly Thinkpad X200).

{ Some retard complained the game is "unprofessional" for giving an offensive warning during compilation on Windows. Well, if you haven't noticed, the game IS unprofessional, the developer doesn't get paid, so it can give whatever messages it wants you fucking pussy. ~drummyfish }

The game's features include a fully 3D, completely deterministic physics, lovely soulful software rendering, replays, ghost cars and custom maps (written in a plain ASCII text format). The base package comes with 5 standard, 5 tiny and 2 bonus maps. There are now also mods, such as one for making tool assisted runs. Like Trackmania, the game is built purely around the concept of a time attack run, there are no opponents on the track (except for a potential collisionless ghost), no car damage or upgrades, just pure driving skill and ticking clock.

Licar fulfilled drummyfish's lifelong dream to make a Trackmania clone, because he used to love the game and then had to abandon it as part of his decision to quit proprietary software. The project also gave him an opportunity to showcase his libraries and demonstrate some of the LRS principles on a bigger project -- although the game isn't truly an LRS ideal, it still shows how powerful minimalism can be, even when applied to a relatively mainstream vision of what a video game is. By this it can potentially and hopefully reach more normies.

Just like Anarch, Licar adheres to basic LRS programming practices, for example it is fully written in C99, is completely public domain under CC0, uses no build system, no third party libraries, doesn't rely on standard library, doesn't use floating point and embeds its configuration and assets right in the source code (except for optional music and external data file). The whole game was made completely from scratch, including all assets, the text font, recording own musical samples for custom sound font for the soundtrack etc. The whole code has around 25 thousand lines of code. Needless to say the game is very portable end efficient as a result: the compiled binary (including embedded assets) usually weights around 300 kB, the program runs with less than 500 kB RAM on CPUs clocking even around 100 MHz. It was even run on Pokitto, albeit in an extremely limited way.

## Technical Details

Licar is wholly written in C99 and only uses small3dlib (S3L) and tinyphysicsengine (TPE) as libraries -- apart from these no other libraries are used (not even standard library, except for using fixed size integers from stdint.h). The code is a single compilation unit, i.e. everything is implemented as header files (including S3L and TPE) that are included by a frontend which is then the only file to compile (no need for manual linking, build systems and whatnot). Of course specific frontends have to use some kind of I/O library to deliver interaction with the player, but these are not hard dependencies of the game itself, only of a specific frontend -- several frontends are implemented, including SDL2, CSFML and X11. Frontends are very simple as they're only required to implement extremely basic functions such as a pixel drawing function, key press checking function and a few others. The game was successfully compiled and played under GNU/Linux, Win$hit, OpenBSD, on Raspberry Pi, in web browser and even on very weak devices such as Pokitto and ESPBoy, albeit in a very limited "tech demo" way. When counting raw lines (`wc -l`), all code (including frontends etc.) totals around 25000 lines of code, whilst only the pure game code (only header files) has around 21000 lines.

No floating point is ever used in the source code, everything (including 3D rendering and 3D physics) is implemented with 32 bit fixed point.

Graphics: like with Anarch, rendering to actual screen is realized through a frontend-defined pixel drawing function that's used by the game code to render everything from GUI and text to the 3D view. RGB565 (65536 colors) is used as a color format, with the option to turn on RGB332 (256 colors) as well. All images are embedded in the source code and stored in 64x64 resolution in indexed format (except for sky images which are effectively composed of 2x2 normal images to give a higher resolution). The car 3D model is also embedded in source code and was initially created with Blender. The models of map blocks are created in code. Textures are mapped to blocks automatically by something akin to a "uber projection", i.e. the vertex UV coordinates are derived from the geometric coordinates, and the slope of the triangle decides whether a wall or floor texture should be applied. When loading a map, its 3D model is created and invisible triangles are culled away (which is a little time consuming and makes bigger maps take longer to load). The map model triangles are then sorted so that the map is split into 64 (4x4x4) chunks -- only nearest 8 chunks of the map are being rendered at any time. Far away chunks are cheaply drawn as a very primitive "LOD", simply a flat-colored 2D half-transparent square. All transparency is handled by dithering. Text is drawn using a custom simple, vector, "segmented-display-like" font whose data are embedded in the source code.

Physics: physics is deterministic and is always calculated at 30 ticks per second regardless of rendering FPS is, interpolation is additionally applied to smooth the animation out for rendering. Internally the car is composed of 5 spheres (4 wheels and the body) and is technically a soft body, but the shape is iteratively "stiffened" so that it appears as a rigid body. The relative position of the spheres is used to determine the car's orientation which is then applied to the 3D model for rendering. The map's shape in the physics world is modeled by a sort of signed distance function to handle collisions with the car.

Audio: all audio is in very simple 8 bit 8 KHz mono format, KISS. Sound effects are all generated procedurally. The game comes with a manually created background music track stored in raw format in a separate file, which can be played by the frontend if it can and is willing to -- simpler frontends can just ignore music.

And finally for some more uncategorized details. Maps are written in a plain text mini-language that specifies where to place individual map blocks, what material and transformation they shall have etc. The process of loading a map includes reading the text format and transforming it into the internal binary representation wherein blocks are sorted so as to make block lookups fast via binary search (this is crucial for resolving collisions as we need to quickly check the car's nearest blocks). Replays are similarly stored in a plain text format -- each replay record takes up 16 bits and stores a change in input along with ticks since the last record (if the bits don't suffice to encode the ticks, a redundant no-change record is simply inserted). All these text data (i.e. mainly maps and replays) are stored in a virtual data file -- behind the scenes this files consists of the internal data file (one containing the basic maps, compiled right in the binary) and an optional external data file, which on platforms with filesystems is a normal file that can be edited to add more maps etc. Almost everything in the game is optional and can be turned off so that it's possible to play it on any kind of potato -- there can be no sound, texturing, no file system, no color display etc.

## Trivia

- The background desert image with pyramids was made from a photo which drummyfish took when he visited Egypt.
- As a small easteregg the map LC3 has a hidden heart shape.
- The setting for simplified graphics is called POTATO.
- The official trailer clearly states the game is non-gay.
- The instrument samples in the official soundtrack were recorded by drummyfish: the drums come from his brother's drum set and the piano from an old piano they used to have in the living room.
- The car model has been ported to SuperTuxKart as an addon by a very nice human being <3
- TODO

## Postmortem

TODO: some reflections n shit here, when the time comes

## See Also

- Anarch
- racetrack
- LRS
- Trackmania

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