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|
use glam::{IVec2, Vec2};
use rapier2d::{
dynamics::{RigidBody, RigidBodyBuilder, RigidBodyHandle},
geometry::{Collider, ColliderHandle},
};
use crate::{
config::MASS_SCALING,
content::materials::MaterialId,
sim::{
cell::Cell, lib::marching_squares::Marchable, rb_manager::RbManager, sim_manager::SimCtx,
},
sprite_loader::load_sprite_to_cells,
};
fn mass_from_cells(cells: &[Cell]) -> f32 {
cells
.iter()
.fold(0, |acc, cur| acc + cur.material.def().density) as f32
* MASS_SCALING
}
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 {
// TODO merge ctxs?
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_and_rb(
cells: EntityCells,
rb: RigidBody,
behaviour: Option<Box<dyn EntityBehaviour>>,
) -> Self {
let collider = RbManager::convex_hull_collider_from_marchable(&cells, Some(10))
.mass(mass_from_cells(&cells.cells))
.build();
EntityDef {
rb: Some(rb),
collider: Some(collider),
cells: Some(cells),
behaviour,
}
}
pub fn from_cells(
position: Vec2,
cells: EntityCells,
behaviour: Option<Box<dyn EntityBehaviour>>,
) -> Self {
let rb = RigidBodyBuilder::dynamic().translation(position).build();
let collider = RbManager::convex_hull_collider_from_marchable(&cells, Some(10))
.mass(mass_from_cells(&cells.cells))
.build();
EntityDef {
rb: Some(rb),
collider: Some(collider),
cells: Some(cells),
behaviour,
}
}
pub fn from_sprite(
position: Vec2,
path: &str,
behaviour: Option<Box<dyn EntityBehaviour>>,
) -> Self {
let sprite_cells = load_sprite_to_cells(path);
let mut entity_cells = EntityCells {
cells: sprite_cells.cells,
size: IVec2::new(sprite_cells.width as i32, sprite_cells.height as i32),
};
entity_cells
.cells
.iter_mut()
.for_each(|c| c.set_entity_integrated(true));
EntityDef::from_cells(position, entity_cells, behaviour)
}
}
#[derive(Clone, Copy, PartialEq, Eq, Debug, Hash)]
pub struct EntityId(pub u32);
pub struct EntityData {
pub id: EntityId,
pub rb_h: Option<RigidBodyHandle>,
pub collider_h: Option<ColliderHandle>,
pub cells: Option<EntityCells>,
}
pub struct EntityUpdateResult {
pub deferred_destructions: Vec<EntityId>,
}
pub struct EntityUpdateCtx<'a> {
pub entity_data: &'a mut EntityData,
deferred_destructions: Vec<EntityId>,
}
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: EntityId) {
self.deferred_destructions.push(entity_id);
}
pub fn to_result(self) -> EntityUpdateResult {
EntityUpdateResult {
deferred_destructions: self.deferred_destructions,
}
}
}
impl EntityData {
pub fn _transform(&self, rb_manager: &RbManager) -> Option<(Vec2, (f32, f32))> {
self.rb_h.and_then(|rb_h| {
rb_manager
.physics_manager
.world
.bodies
.get(rb_h)
.map(|rb| (rb.translation(), (rb.rotation().cos(), rb.rotation().sin())))
})
}
pub fn transform(&self, ctx: &SimCtx) -> Option<(Vec2, (f32, f32))> {
self._transform(ctx.rb_manager)
}
}
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 compute_collider(&self) -> Option<Collider> {
self.data.cells.as_ref().map(|cells| {
RbManager::convex_hull_collider_from_marchable(cells, Some(10))
.mass(mass_from_cells(&cells.cells))
.build()
})
}
pub fn new(
id: EntityId,
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,
}
}
}
|
