FallingSandEngine

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FallingSandEngine

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Experimental 2D falling sand engine written in Rust

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# FallingSandEngine (Rust rewrite)

_Note: Development in this repo has stopped. 
After designing some gameplay, I decided I want some features that would need large rewrites to add into this engine. 
Instead I took some lessons from this project and started a new one with the features I need baked in from the start. 
I've been working on it for a while and it's got some cool stuff, it'll be announced when it's ready :)_

---

An experimental falling sand engine written in Rust, successor to [the C++ version](https://github.com/PieKing1215/FallingSandSurvival)

Some features:
- Chunk based infinite world
- Multithreaded sand sim (uses unsafe, questionable soundness)
- Multithreaded particles (uses unsafe, probably unsound)
- Rapier2d rigidbodies (with partially simulated pixels)
- GPU compute colored lighting (Terraria style)
- Partially multithreaded world/structure generation system inspired by Minecraft's
- Very basic entity system using specs ECS

https://github.com/PieKing1215/FallingSandEngine/assets/13819558/a76c127c-236b-4526-8666-2823cc6e162c

Some points of interest:
- [world.rs](https://github.com/PieKing1215/FallingSandEngine/blob/master/fs_common/src/game/common/world/world.rs#L400): World tick function
 - <details><summary>Pseudocode for rigidbody/entity/sand tick sequence</summary>
 
 ```
 // fill rigidbody hitboxes in world with dummy pixels
 for each rigidbody
 for each point in rigidbody
 calculate world position for the point
 set world pixel at that position to dummy "object" type (acts like solid)
 if there was a sand pixel there
 make it a particle or displace it
 apply impulse to rigidbody at the point
 
 // fill entity hitboxes in world with dummy pixels
 for each entity
 for each point in entity
 calculate world position for the point
 if world pixel at that position is air:
 set world pixel at that position to dummy "object" type
 
 tick pixel (sand) simulation for chunks
 
 tick particle simulation
 
 // clear dummy pixels from entity hitboxes
 for each entity
 for each point in entity
 calculate world position for the point
 if world pixel at that position is dummy "object" type:
 set world pixel at that position to air
 
 tick entities
 
 // clear dummy pixels from rigidbody hitboxes
 for each rigidbody
 for each point in rigidbody
 calculate world position for the point
 if world pixel at that position is dummy "object" type:
 set world pixel at that position to air
 
 tick pixel (sand) simulation for rigidbodies
 
 update chunk collision
 ```
 </details> 
- [simulator.rs](https://github.com/PieKing1215/FallingSandEngine/blob/master/fs_common/src/game/common/world/simulator.rs#L445): Sand simulation for chunks & RigidBodies
 - See also [this issue thread](https://github.com/PieKing1215/FallingSandSurvival/issues/4) which describes some of the techniques I used
- [chunk_handler.rs](https://github.com/PieKing1215/FallingSandEngine/blob/master/fs_common/src/game/common/world/chunk_handler.rs#L104): Chunk handler tick function (chunk loading/unloading/etc)
- [lighting_prep.comp](https://github.com/PieKing1215/FallingSandEngine/blob/master/gamedir/assets/data/shaders/lighting_prep.comp)/[lighting_propagate.comp](https://github.com/PieKing1215/FallingSandEngine/blob/master/gamedir/assets/data/shaders/lighting_propagate.comp)/[chunk_light.frag](https://github.com/PieKing1215/FallingSandEngine/blob/master/gamedir/assets/data/shaders/chunk_light.frag): Lighting shaders
- [particle.rs](https://github.com/PieKing1215/FallingSandEngine/blob/master/fs_common/src/game/common/world/particle.rs#L149): Particles
- [gen/](https://github.com/PieKing1215/FallingSandEngine/tree/master/fs_common/src/game/common/world/gen): World gen systems
 - Conceptually heavily inspired by Minecraft's biome/feature/structure generation system
 - https://minecraft.wiki/w/Custom_world_generation
 - https://www.youtube.com/watch?v=CSa5O6knuwI&t=1342s
 - See also [this article](https://accidentalnoise.sourceforge.net/minecraftworlds.html) which describes a cave generation technique that mine is based off of
- [gamedir/assets/data/structure/](https://github.com/PieKing1215/FallingSandEngine/tree/master/gamedir/assets/data/structure): Worldgen structure data

## Download

Automatic builds for Windows x64 can be found here (requires GitHub account to download): https://github.com/PieKing1215/FallingSandEngine/actions/workflows/autobuild.yml

Controls are (arrow keys/C/X/Z) or (WASD/space/shift/Z)

## Building

Install rust/cargo

Clone the repo

To run locally you should be able to just do `cargo run`/`cargo run --release` 
You can also add `-- -d` to enable debug UI 
(there's also a `profile` feature which enables profiling with Tracy)

I haven't built it to linux in a while but it should work

There's also a bash script which can bundle everything needed to run the game into the package/ folder (builds for release, copies assets, and generates a dependency licences file) 
It requires cargo-lichking: `cargo install cargo-lichking` 
To run: `sh package.sh`

## Licensing

### Code
All original code files are licensed under the [BSD 3-Clause License](LICENSE).

### Assets
All art assets (everything in gamedir/assets/texture/) are licensed under the [Creative Commons Attribution-NonCommercial 4.0 International License](https://creativecommons.org/licenses/by-nc/4.0/).

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