1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
|
use glam::Vec2;
use rand::random_range;
use rapier2d::{dynamics::RigidBodyHandle, parry::bounding_volume::Aabb, pipeline::QueryFilter};
use crate::{
content::materials::{MaterialForm, MaterialId, fire::FireCellView},
sim::{cell::Cell, lib::ray::AwDda, particle_manager::particle::Particle, sim_manager::SimCtx},
};
pub fn apply_explosion(
ctx: &mut SimCtx,
centre: Vec2,
radius: i32,
force_offset: Vec2,
force_multiplier: f32,
) {
let get_vel = |pos: Vec2| {
let d = pos.distance(centre);
if d < 0.001 || d > radius as f32 {
return Vec2::ZERO;
}
let dir = (pos - centre) / d;
let falloff = 1.0 - (d / radius as f32);
(force_offset + dir) * force_multiplier * random_range(0.5..1.5) * falloff
};
// cell grid
for x in -radius..radius {
for y in -radius..radius {
if x.pow(2) + y.pow(2) < radius.pow(2) {
// if there's a cell, convert it to a particle
let pos = Vec2::new(centre.x + x as f32, centre.y + y as f32);
let ipos = pos.round().as_ivec2();
if let Some(cell) = ctx.cell_manager.get_cell_from_game_position(ipos.x, ipos.y) {
let mut fire = Cell::from_material(MaterialId::Fire);
fire.set_ticks_lived(300);
fire.match_parity(ctx.cell_manager.seqno);
if cell.material == MaterialId::Void && random_range(0.0..1.0) > 0.5 {
if random_range(0.0..1.0) > 0.1 {
ctx.cell_manager
.set_cell_from_game_position(ipos.x, ipos.y, fire, false);
} else {
let vel = get_vel(pos);
ctx.particle_manager.particles.push(Particle::new(
pos,
vel,
MaterialId::Fire,
1.0,
0.0,
));
}
} else if [
MaterialForm::Solid,
MaterialForm::Liquid,
MaterialForm::Powder,
]
.contains(&cell.material.def().form)
{
ctx.cell_manager
.set_cell_from_game_position(ipos.x, ipos.y, fire, false);
if random_range(0.0..1.0) > 0.6 {
let vel = get_vel(pos);
ctx.particle_manager.particles.push(Particle::new(
pos,
vel,
cell.material,
5.0,
0.0,
));
}
}
}
}
}
}
// rigidbodies
let colliders = ctx
.rb_manager
.physics_manager
.world
.intersect_aabb_conservative(
Aabb::new(centre - radius as f32, centre + radius as f32),
QueryFilter::only_dynamic(),
);
let body_handles: Vec<Option<RigidBodyHandle>> = colliders.map(|(_, c)| c.parent()).collect();
for h in body_handles {
if let Some(h) = h
&& let Some(body) = ctx.rb_manager.physics_manager.world.bodies.get_mut(h)
{
// magic number for good vibes
body.apply_impulse(get_vel(body.translation()) * 3.0, true);
}
}
}
// TODO profile packing entity ID into cells?
// TODO sink power in a radius around the impact
// might improve performance by a lot if we don't have to raycast for hit entities
pub fn apply_bullet(ctx: &mut SimCtx, from: Vec2, to: Vec2, power: u32) {
let dda = AwDda::new(from, to);
let mut p = power as i32;
let dir = (to - from).normalize();
for collision in dda {
if let Some(cell) = ctx
.cell_manager
.get_cell_from_game_position(collision.x, collision.y)
{
let m = cell.material.def();
if ![
MaterialForm::Solid,
MaterialForm::Powder,
MaterialForm::Liquid,
]
.contains(&m.form)
{
continue;
}
p -= m.density as i32;
if p <= 0 {
break;
}
ctx.cell_manager.set_cell_from_game_position(
collision.x,
collision.y,
Cell::void(),
false,
);
if random_range(0.0..1.0) > 0.8 {
ctx.particle_manager.particles.push(Particle::new(
collision.as_vec2(),
(dir + Vec2::new(random_range(-0.15..0.15), random_range(-0.15..0.15))) * 150.0,
cell.material,
5.0,
0.2,
));
}
}
}
}
|
