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use rand::RngExt;
use crate::sim::{cell::Cell, materials::MaterialId, sim::UpdateCtx};
trait FireCellView {
fn get_ticks_lived(self) -> u16;
fn set_ticks_lived(&mut self, ticks: u16) -> ();
fn is_flammable(self) -> bool;
}
impl FireCellView for Cell {
fn get_ticks_lived(self) -> u16 {
self.data
}
fn set_ticks_lived(&mut self, ticks: u16) -> () {
self.data = ticks;
}
// this could be a property of the material def, I think it's better here for now
fn is_flammable(self) -> bool {
[MaterialId::Wood].contains(&self.material)
}
}
// TODO optimize number of rng calls?
#[inline]
pub fn sim_update(ctx: &mut UpdateCtx) {
let ticks_lived = ctx.cell.get_ticks_lived();
// 2 seconds
if ticks_lived > 240 {
// we have a chance to live longer--roughly 50% chance of living an extra second
if ctx.rng.random_range(0.0..1.0) > 0.995 {
// kill ourselves, with a chance to turn into ash
if ctx.rng.random_range(0.0..1.0) > 0.8 {
// TODO ash material
ctx.set_cell(0, 0, Cell::from_material(MaterialId::Sand));
} else {
ctx.set_cell(0, 0, Cell::void());
}
return;
}
}
// at an average of 4 times per lifespan, try to spread
// 1/60 * 240 = 4
if ctx.rng.random_range(0.0..1.0) > (59.0 / 60.0) {
let (dx, dy) = (ctx.rng.random_range(-1..=1), ctx.rng.random_range(-1..=1));
if let Some(target) = ctx.get_cell(dx, dy)
&& target.is_flammable()
{
ctx.set_cell(dx, dy, Cell::from_material(MaterialId::Fire));
}
}
// 8 times in our lifespan, emit smoke
if ticks_lived % 30 == 0 {
if let Some(target) = ctx.get_cell(0, -1)
&& target.material == MaterialId::Void
{
for (dx, dy) in [
(0, -1),
(1 - ctx.seqno_parity as i32 * 2, 0),
(-1 + ctx.seqno_parity as i32 * 2, 0),
(0, 1),
] {
if let Some(target) = ctx.get_cell(dx, dy)
&& target.material == MaterialId::Void
{
ctx.set_cell(dx, dy, Cell::from_material(MaterialId::Smoke));
break;
}
}
}
}
ctx.cell.set_ticks_lived(ticks_lived + 1);
ctx.set_cell(0, 0, *ctx.cell);
}
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