ABC_Game_Engine

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Under Construction 🚧

This project is still under construction and is in the pre-release stage. Significant changes will be made that might break things. We apologize for the inconvenience.

Ease of use

The idea for this project is that it would be so intuitive to use that it would be feasible to learn rust through this game engine. Learning is often made better when you can make something interactable rather than just manipulating data and we want to provide that opportunity in Rust.

OS Support

Most major operating systems should be supported, however only Windows has been tested.

Current Features

For a complete list of features that are planned or done visit here

Renderers

Both a console renderer and a pixel art renderer.

Physics Engine

Rapier is used for physics and can be accessed for collision info as a resource.

A Simple Platformer Example

use ABC_Game_Engine::physics::rapier2d::geometry::Ray;
use ABC_Game_Engine::physics::rapier2d::math::Real;
use ABC_Game_Engine::physics::rapier2d::na as nalgebra;
use ABC_Game_Engine::physics::rapier2d::na::vector;
use ABC_Game_Engine::prelude::*;
use ABC_lumenpyx::prelude::*;

struct Player;
struct Ground;

struct PlayerController {
    speed: f32,
    jump_force: f32,
}

impl System for PlayerController {
    fn run(&mut self, entities_and_components: &mut EntitiesAndComponents) {
        let player_entity;
        let (player_x, player_y) = {
            let player_entities = entities_and_components
                .get_entities_with_component::<Player>()
                .cloned()
                .collect::<Vec<Entity>>();

            player_entity = player_entities[0];

            let (transform,) =
                entities_and_components.get_components::<(Transform,)>(player_entity);
            (transform.x, transform.y)
        };

        let delta_time: f32;
        let mut normalized_dir = [0.0 as f32; 2];
        {
            delta_time = entities_and_components
                .get_resource::<DeltaTime>()
                .expect("Failed to get DeltaTime resource")
                .get_delta_time() as f32;

            let physics_info = entities_and_components
                .get_resource::<RapierPhysicsInfo>()
                .expect("Failed to get PhysicsInfo resource");

            let input = entities_and_components.get_resource::<Input>().unwrap();

            if input.get_key_state(KeyCode::A) == KeyState::Held {
                normalized_dir[0] -= 1.0;
            }

            if input.get_key_state(KeyCode::D) == KeyState::Held {
                normalized_dir[0] += 1.0;
            }

            let is_ground_check = |collider_handle: ColliderHandle, _: &Collider| {
                let entity = physics_info
                    .get_associated_entity_with_collider_handle(collider_handle.into())
                    .expect("Failed to get associated entity with collider handle");

                entities_and_components
                    .try_get_components::<(Ground,)>(entity)
                    .0
                    .is_some()
            };

            let is_ground_filter = QueryFilter {
                predicate: Some(&is_ground_check),
                ..Default::default()
            };

            let intersection = physics_info.cast_ray(
                &Ray::new(
                    vector![player_x as f32, player_y as f32 - 5.01].into(),
                    vector![0.0, -1.0],
                ),
                Real::MAX,
                true,
                is_ground_filter,
            );

            if input.get_key_state(KeyCode::Space) == KeyState::Pressed && intersection.is_some() {
                let intersection = intersection.unwrap();

                if intersection.1 < 0.01 {
                    normalized_dir[1] = 1.0;
                }
            }
        }

        if let (Some(_), Some(_), Some(rigid_body)) = entities_and_components
            .try_get_components_mut::<(Player, Transform, RigidBody)>(player_entity)
        {
            rigid_body.apply_impulse(
                vector![
                    normalized_dir[0] * self.speed * delta_time,
                    normalized_dir[1] * self.jump_force,
                ],
                true,
            );
        }
    }
}

fn main() {
    let mut scene = Scene::new();

    let mut lumenpyx_eventloop =
        LumenpyxEventLoop::new(&mut scene.world, [160, 160], "Platformer Example");

    lumenpyx_eventloop.set_render_settings(
        &mut scene.world,
        RenderSettings::default()
            .with_reflections(false)
            .with_shadows(false),
    );
    {
        let entities_and_components = &mut scene.world.entities_and_components;

        let camera = Camera::new();

        entities_and_components.add_entity_with((camera, Transform::default()));

        let ball = Circle::new([1.0, 1.0, 1.0, 1.0], 5.0);

        let circle_collider = ColliderBuilder::ball(5.0).build();
        let circle_rb = RigidBodyBuilder::dynamic().additional_mass(1.0).build();

        entities_and_components.add_entity_with((
            ball,
            Transform {
                x: -20.0,
                y: -20.0,
                z: 0.0,
                rotation: 0.0,
                scale: 1.0,
                origin_x: 0.0,
                origin_y: 0.0,
            },
            circle_rb,
            circle_collider,
            Player {},
        ));

        let ground_collider = ColliderBuilder::cuboid(160.0, 5.0).build();
        let ground_rb = RigidBodyBuilder::fixed().build();
        let ground_rect = Rectangle::new([0.0, 1.0, 1.0, 1.0], 160.0, 10.0);

        entities_and_components.add_entity_with((
            ground_rect,
            Transform {
                x: 0.0,
                y: -80.0,
                z: 0.0,
                rotation: 0.0,
                scale: 1.0,
                origin_x: 0.0,
                origin_y: 0.0,
            },
            ground_collider,
            ground_rb,
            Ground {},
        ));
    }

    scene.world.add_system(PlayerController {
        speed: 1000.0,
        jump_force: 3000.0,
    });

    physics::add_default_physics_systems(&mut scene.world);

    let physics_info = scene
        .world
        .entities_and_components
        .get_resource_mut::<RapierPhysicsInfo>();

    physics_info
        .expect("Failed to get PhysicsInfo resource")
        .set_gravity([0.0, -9.81 * 4.0].into());

    lumenpyx_eventloop.run(&mut scene.world, |world| {
        world.run();

        render(&mut world.entities_and_components);
    });
}