veloren_common_systems/
phys_events.rs

1use common::{
2    comp::{Fluid, Mass, PhysicsState, Pos, PreviousPhysCache, Vel},
3    event::EventBus,
4    outcome::Outcome,
5};
6use common_ecs::System;
7use specs::{Join, Read, ReadStorage};
8
9#[derive(Default)]
10pub struct Sys;
11
12impl<'a> System<'a> for Sys {
13    type SystemData = (
14        Read<'a, EventBus<Outcome>>,
15        ReadStorage<'a, PhysicsState>,
16        ReadStorage<'a, PreviousPhysCache>,
17        ReadStorage<'a, Vel>,
18        ReadStorage<'a, Pos>,
19        ReadStorage<'a, Mass>,
20    );
21
22    const NAME: &'static str = "phys_events";
23    const ORIGIN: common_ecs::Origin = common_ecs::Origin::Common;
24    const PHASE: common_ecs::Phase = common_ecs::Phase::Create;
25
26    fn run(
27        _job: &mut common_ecs::Job<Self>,
28        (outcomes, physics_states, previous_phys_cache, velocities, positions, masses): Self::SystemData,
29    ) {
30        let mut outcomes = outcomes.emitter();
31        for (physics_state, prev, vel, pos, mass) in (
32            &physics_states,
33            &previous_phys_cache,
34            &velocities,
35            &positions,
36            &masses,
37        )
38            .join()
39        {
40            // Only splash when going from air into a liquid
41            if let (Some(Fluid::Liquid { kind, .. }), Some(Fluid::Air { .. })) =
42                (physics_state.in_fluid, prev.in_fluid)
43            {
44                outcomes.emit(Outcome::Splash {
45                    pos: pos.0,
46                    vel: if vel.0.magnitude_squared() > prev.velocity.magnitude_squared() {
47                        vel.0
48                    } else {
49                        prev.velocity
50                    },
51                    mass: mass.0,
52                    kind,
53                });
54            }
55        }
56    }
57}
veloren_common_systems/phys_events.rs

veloren_common_systems/
phys_events.rs
