Lotus is a game engine with the main focus of being easy-to-use and straight forward on developing 2D games.
It's based on the Entity-Component-System paradigm, providing windowing, rendering, physics, input handling, and more.
Heavily inspired by awesome open-source projects like Bevy, Comfy and LÖVE.

How it works?

With the power of macros, the engine basic template could be very abstracted and easy to look up to.
The your_game! macro only needs three parameters to make a game real.

-> The window configuration

• This parameter will be used to personalize and create the game window.

-> The setup function

• This parameter is a real function that will be ran once at the start of the application.
• The function should contain a mutable reference to the context as the parameter.
• Should contain all the initial entity spawning code for the game.

-> The update function

• This parameter is a real function as well, that will be ran at each frame of the application.
• The function should contain a mutable reference to the context as the parameter.
• Should contain all the logic functions behind the game.

Examples

The classic hello world:

use lotus_engine::*;

your_game!(WindowConfiguration::default(), setup, update);

fn setup(_context: &mut Context) {}

fn update(_context: &mut Context) {
    eprintln!("Hello World!");
}

And here are some more complex initial examples to demonstrate the engine's potential:

• Pong: examples/pong.rs
• Breakout: examples/breakout.rs
• Rendering geometric forms: examples/simple_shapes.rs
• Rendering sprites: examples/simple_sprite.rs
• Simple physics simulation: examples/physics_simulation.rs

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Build Instructions

Setting Up a Lotus Project

Lotus is a normal rust dependency, therefore an empty lotus project is very easy to set up. You should use the latest stable version of rustc or above.

• To check which version you have downloaded, use:

rustc --version

• Initialize a new rust project:

cargo init --bin

• Add the engine as a depedency on your Cargo.toml:

[dependencies]
lotus_engine = "0.1.x"

• You may use the following command to get the latest version of the crate:

cargo add lotus_engine

• And now to run it natively:

cargo run

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The final goal of this project should be something similar to this architecture diagram: