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|
use glam::{IVec2, Vec2};
use rapier2d::{
dynamics::{RigidBody, RigidBodyBuilder, RigidBodyHandle},
geometry::{Collider, ColliderHandle},
};
use crate::{
config::CELLS_TO_METRES,
sim::{
cell::{cell::Cell, materials::MaterialId},
lib::marching_squares::Marchable,
rb_manager::RbManager,
sim_manager::SimCtx,
},
};
pub mod entities;
pub struct EntityCells {
pub size: IVec2,
pub cells: Vec<Cell>,
}
impl EntityCells {
#[inline]
pub fn get_cell_at_local_position(&self, pos: IVec2) -> Cell {
self.cells[pos.x as usize + pos.y as usize * self.size.x as usize]
}
#[inline]
pub fn set_cell_at_local_position(&mut self, pos: IVec2, cell: Cell) {
self.cells[pos.x as usize + pos.y as usize * self.size.x as usize] = cell;
}
}
impl Marchable for EntityCells {
fn occupied(&self, pos: IVec2) -> bool {
if pos.x < 0 || pos.x >= self.size.x || pos.y < 0 || pos.y >= self.size.y {
false
} else {
self.get_cell_at_local_position(pos).material != MaterialId::Void
}
}
fn size(&self) -> IVec2 {
self.size
}
}
pub trait EntityBehaviour {
fn update(&mut self, update_ctx: &mut EntityUpdateCtx, ctx: &mut SimCtx, delta_time: f32)
-> ();
fn physics_update(
&mut self,
update_ctx: &mut EntityUpdateCtx,
ctx: &mut SimCtx,
delta_time: f32,
) -> ();
}
pub struct EntityDef {
pub rb: Option<RigidBody>,
pub collider: Option<Collider>,
pub cells: Option<EntityCells>,
pub behaviour: Option<Box<dyn EntityBehaviour>>,
}
impl EntityDef {
pub fn from_cells(
position: Vec2,
cells: EntityCells,
behaviour: Option<Box<dyn EntityBehaviour>>,
) -> Self {
let rb = RigidBodyBuilder::dynamic()
.translation(position / CELLS_TO_METRES)
.build();
let collider = RbManager::convex_hull_collider_from_marchable(&cells, None).build();
EntityDef {
rb: Some(rb),
collider: Some(collider),
cells: Some(cells),
behaviour,
}
}
}
pub struct EntityData {
pub id: u32,
pub rb_h: Option<RigidBodyHandle>,
pub collider_h: Option<ColliderHandle>,
pub cells: Option<EntityCells>,
}
pub struct EntityUpdateResult {
pub deferred_destructions: Vec<u32>,
}
pub struct EntityUpdateCtx<'a> {
pub entity_data: &'a mut EntityData,
deferred_destructions: Vec<u32>,
}
impl<'a> EntityUpdateCtx<'a> {
pub fn from_entity_data(entity_data: &'a mut EntityData) -> Self {
EntityUpdateCtx {
entity_data,
deferred_destructions: Vec::new(),
}
}
pub fn deferred_destroy(&mut self, entity_id: u32) {
self.deferred_destructions.push(entity_id);
}
pub fn to_result(self) -> EntityUpdateResult {
EntityUpdateResult {
deferred_destructions: self.deferred_destructions,
}
}
}
impl EntityData {
pub fn transform(&self, ctx: &SimCtx) -> Option<(Vec2, (f32, f32))> {
self.rb_h
.map(|rb_h| {
ctx.rb_manager
.physics_manager
.rigid_body_set
.get(rb_h)
.map(|rb| {
(
rb.translation() * CELLS_TO_METRES,
(rb.rotation().cos(), rb.rotation().sin()),
)
})
})
.flatten()
}
}
pub struct Entity {
pub data: EntityData,
behaviour: Option<Box<dyn EntityBehaviour>>,
}
impl Entity {
pub fn update(&mut self, ctx: &mut SimCtx, delta_time: f32) -> Option<EntityUpdateResult> {
if let Some(behaviour) = &mut self.behaviour {
let mut ectx = EntityUpdateCtx::from_entity_data(&mut self.data);
behaviour.update(&mut ectx, ctx, delta_time);
return Some(ectx.to_result());
}
None
}
pub fn physics_update(
&mut self,
ctx: &mut SimCtx,
delta_time: f32,
) -> Option<EntityUpdateResult> {
if let Some(behaviour) = &mut self.behaviour {
let mut ectx = EntityUpdateCtx::from_entity_data(&mut self.data);
behaviour.physics_update(&mut ectx, ctx, delta_time);
return Some(ectx.to_result());
}
None
}
pub fn new(
id: u32,
rb_h: Option<RigidBodyHandle>,
collider_h: Option<ColliderHandle>,
cells: Option<EntityCells>,
behaviour: Option<Box<dyn EntityBehaviour>>,
) -> Self {
Entity {
data: EntityData {
id,
rb_h,
collider_h,
cells,
},
behaviour,
}
}
}
|
