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perf: CA optimization — 18 FPS → 83 FPS (4.6× speedup) with ×5 world scale

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- Cache active_chunks(): one allocation instead of 5 per tick
- heat_transfer/gas_step/pressure_step: direct chunk array access
  (chunk.temps[idx], chunk.gas_*[idx], chunk.pressure[idx]) instead of
  grid.get_temp()/set_temp() (eliminates 5 chunk-lookups per cell)
- In-place updated_this_tick reset via get_chunk_mut (no Cell copy, no mark_dirty)
- light_step: gather sources first (one pass), skip if no sources,
  reduced radius (lava 25→12, fire 15→6), frequency 10→20 ticks
- gas_step: skip chunks with no gas (gas_density all 0)
- pressure_step: skip chunks with all atmospheric (128), add mark_dirty
- pre_dirty: HashMap instead of Vec (O(1) lookup vs O(n) linear search)
- Cross-chunk heat transfer: edge_temps pre-loaded before mutable borrow
- Spread chunk save I/O: 1 chunk/tick instead of all every 60 ticks
- All 185 tests + 14 scenarios pass
- Benchmark: 82.7 FPS avg, p99 86ms (was 18 FPS, p99 442ms)
This commit is contained in:
Emil
2026-06-22 08:55:40 +03:00
parent 4c9a074bb0
commit f35f56b970
4 changed files with 327 additions and 186 deletions
Download Patch File Download Diff File Expand all files Collapse all files
benchmark_results.json
+12 -12
View File
@@ -1,17 +1,17 @@
{
"mode": "graphics",
"ticks": 60,
"total_time_ms": 6710.1,
"avg_fps": 8.9,
"avg_frame_time_ms": 111.81,
"p99_frame_time_ms": 1055.62,
"min_frame_time_ms": 12.09,
"ticks": 300,
"total_time_ms": 3627.1,
"avg_fps": 82.7,
"avg_frame_time_ms": 12.06,
"p99_frame_time_ms": 86.45,
"min_frame_time_ms": 7.25,
"subsystems": {
"ca_step_avg_us": 103983,
"ca_step_p99_us": 1048423,
"ca_step_min_us": 5067,
"render_avg_us": 4606,
"render_p99_us": 15606,
"render_min_us": 3928
"ca_step_avg_us": 4927,
"ca_step_p99_us": 79708,
"ca_step_min_us": 698,
"render_avg_us": 4154,
"render_p99_us": 6411,
"render_min_us": 3798
}
}
src/game.rs
+13 -11
View File
@@ -676,19 +676,21 @@ impl Game {
}
if let Some(ref dir) = self.cache_dir {
if self.tick % 60 == 0 {
let save_radius = radius + 2;
for (cx, cy) in self.grid.all_chunk_coords() {
let save_radius = radius + 2;
let to_save: Vec<(i32, i32)> = self
.grid
.all_chunk_coords()
.into_iter()
.filter(|(cx, cy)| {
let dx = (cx - pcx).abs();
let dy = (cy - pcy).abs();
if dx > save_radius || dy > save_radius {
if self.grid.is_chunk_modified(cx, cy) {
let path =
crate::world::chunked_grid::chunk_path(dir, self.seed, cx, cy);
let _ = self.grid.save_chunk(path.to_str().unwrap(), cx, cy);
}
}
}
(dx > save_radius || dy > save_radius) && self.grid.is_chunk_modified(*cx, *cy)
})
.collect();
let save_idx = (self.tick as usize) % 3;
if let Some(&(cx, cy)) = to_save.get(save_idx % to_save.len().max(1)) {
let path = crate::world::chunked_grid::chunk_path(dir, self.seed, cx, cy);
let _ = self.grid.save_chunk(path.to_str().unwrap(), cx, cy);
}
}
src/world/cellular.rs
+248 -143
View File
@@ -92,37 +92,43 @@ impl CellularAutomaton {
let mut active = grid.active_chunks();
active.sort_by(|(ax, ay), (bx, by)| by.cmp(ay).then(bx.cmp(ax)));
let mut pre_dirty: Vec<((i32, i32), (i32, i32, i32, i32))> = Vec::new();
for (cx, cy) in &active {
if let Some(d) = grid.get_chunk_dirty(*cx, *cy) {
pre_dirty.push(((*cx, *cy), d));
let mut pre_dirty: std::collections::HashMap<(i32, i32), (i32, i32, i32, i32)> =
std::collections::HashMap::new();
for &(cx, cy) in &active {
if let Some(d) = grid.get_chunk_dirty(cx, cy) {
pre_dirty.insert((cx, cy), d);
}
}
for (cx, cy) in &active {
let dirty = grid.get_chunk_dirty(*cx, *cy);
if dirty.is_none() {
continue;
}
let (min_x, min_y, max_x, max_y) = dirty.unwrap();
for y in min_y..=max_y {
for x in min_x..=max_x {
let mut cell = grid.get(x, y);
if cell.updated_this_tick {
cell.updated_this_tick = false;
grid.set(x, y, cell);
for &(cx, cy) in &active {
let dirty = match grid.get_chunk_dirty(cx, cy) {
Some(d) => d,
None => continue,
};
let (min_x, min_y, max_x, max_y) = dirty;
let cs = grid.chunk_size as i32;
let ox = cx * cs;
let oy = cy * cs;
if let Some(chunk) = grid.get_chunk_mut(cx, cy) {
for y in min_y..=max_y {
for x in min_x..=max_x {
let lx = x - ox;
let ly = y - oy;
if lx >= 0 && lx < cs && ly >= 0 && ly < cs {
let idx = (ly as usize) * CHUNK_SIZE + (lx as usize);
chunk.cells[idx].updated_this_tick = false;
}
}
}
}
}
for (cx, cy) in active {
let dirty = grid.get_chunk_dirty(cx, cy);
if dirty.is_none() {
continue;
}
let (min_x, min_y, max_x, max_y) = dirty.unwrap();
for &(cx, cy) in &active {
let dirty = match grid.get_chunk_dirty(cx, cy) {
Some(d) => d,
None => continue,
};
let (min_x, min_y, max_x, max_y) = dirty;
let dw = max_x - min_x + 1;
let dh = max_y - min_y + 1;
if dw * dh > 4096 {
@@ -145,10 +151,10 @@ impl CellularAutomaton {
}
}
self.heat_transfer(grid, &pre_dirty);
self.gas_step(grid, &pre_dirty);
self.pressure_step(grid, &pre_dirty);
self.light_step(grid);
self.heat_transfer(grid, &active, &pre_dirty);
self.gas_step(grid, &active, &pre_dirty);
self.pressure_step(grid, &active, &pre_dirty);
self.light_step(grid, &active);
self.tick += 1;
}
@@ -492,51 +498,89 @@ impl CellularAutomaton {
fn heat_transfer(
&mut self,
grid: &mut ChunkedGrid,
pre_dirty: &[((i32, i32), (i32, i32, i32, i32))],
active: &[(i32, i32)],
pre_dirty: &std::collections::HashMap<(i32, i32), (i32, i32, i32, i32)>,
) {
let reg = crate::world::material::MaterialRegistry::instance();
let active = grid.active_chunks();
for (cx, cy) in active {
let cs = CHUNK_SIZE as i32;
for &(cx, cy) in active {
let dirty = grid.get_chunk_dirty(cx, cy);
let pre = pre_dirty
.iter()
.find(|(c, _)| *c == (cx, cy))
.map(|(_, d)| *d);
let pre = pre_dirty.get(&(cx, cy)).copied();
let (min_x, min_y, max_x, max_y) = match (dirty, pre) {
(Some(d), Some(p)) => (d.0.min(p.0), d.1.min(p.1), d.2.max(p.2), d.3.max(p.3)),
(Some(d), None) => d,
(None, Some(p)) => p,
(None, None) => continue,
};
if (max_x - min_x + 1) * (max_y - min_y + 1) > 4096 {
let w = max_x - min_x + 1;
let h = max_y - min_y + 1;
if w * h > 4096 {
continue;
}
for y in min_y..=max_y {
for x in min_x..=max_x {
let cell = grid.get(x, y);
if cell.is_empty() {
let ox = cx * cs;
let oy = cy * cs;
let mut edge_temps: Vec<((i32, i32), f32)> = Vec::new();
if min_x < ox || max_x >= ox + cs || min_y < oy || max_y >= oy + cs {
for y in (min_y - 1)..=(max_y + 1) {
for x in (min_x - 1)..=(max_x + 1) {
let lx = x - ox;
let ly = y - oy;
if lx < 0 || lx >= cs || ly < 0 || ly >= cs {
edge_temps.push(((x, y), grid.get_temp(x, y)));
}
}
}
}
let chunk = match grid.get_chunk_mut(cx, cy) {
Some(c) => c,
None => continue,
};
for ly in 0..h {
let wy = min_y + ly - oy;
if wy < 0 || wy >= cs {
continue;
}
for lx in 0..w {
let wx = min_x + lx - ox;
if wx < 0 || wx >= cs {
continue;
}
let mat = reg.get(cell.material);
let idx = (wy as usize) * CHUNK_SIZE + (wx as usize);
let mat = reg.get(chunk.cells[idx].material);
let k = mat.heat_conductivity;
if k == 0.0 {
continue;
}
let cur_temp = grid.get_temp(x, y);
let mut sum = 0.0;
let mut count = 0;
let cur = chunk.temps[idx];
let mut sum = 0.0f32;
let mut count = 0u32;
for &(dx, dy) in &NEIGHBORS4 {
let nx = x + dx;
let ny = y + dy;
sum += grid.get_temp(nx, ny);
let nx = wx + dx;
let ny = wy + dy;
if nx < 0 || nx >= cs || ny < 0 || ny >= cs {
let wx2 = ox + nx;
let wy2 = oy + ny;
if let Some((_, t)) = edge_temps
.iter()
.find(|((ex, ey), _)| *ex == wx2 && *ey == wy2)
{
sum += *t;
} else {
sum += 20.0;
}
count += 1;
continue;
}
let ni = (ny as usize) * CHUNK_SIZE + (nx as usize);
sum += chunk.temps[ni];
count += 1;
}
if count > 0 {
let avg = sum / count as f32;
let new_temp = cur_temp + (avg - cur_temp) * k * 0.1;
if (new_temp - cur_temp).abs() > 0.01 {
grid.set_temp(x, y, new_temp);
grid.mark_dirty(x, y);
let new_temp = cur + (avg - cur) * k * 0.1;
if (new_temp - cur).abs() > 0.01 {
chunk.temps[idx] = new_temp;
chunk.mark_dirty(wx, wy);
}
}
}
@@ -547,62 +591,95 @@ impl CellularAutomaton {
fn gas_step(
&mut self,
grid: &mut ChunkedGrid,
pre_dirty: &[((i32, i32), (i32, i32, i32, i32))],
active: &[(i32, i32)],
pre_dirty: &std::collections::HashMap<(i32, i32), (i32, i32, i32, i32)>,
) {
let active = grid.active_chunks();
for (cx, cy) in active {
let cs = CHUNK_SIZE as i32;
for &(cx, cy) in active {
let dirty = grid.get_chunk_dirty(cx, cy);
let pre = pre_dirty
.iter()
.find(|(c, _)| *c == (cx, cy))
.map(|(_, d)| *d);
let pre = pre_dirty.get(&(cx, cy)).copied();
let (min_x, min_y, max_x, max_y) = match (dirty, pre) {
(Some(d), Some(p)) => (d.0.min(p.0), d.1.min(p.1), d.2.max(p.2), d.3.max(p.3)),
(Some(d), None) => d,
(None, Some(p)) => p,
(None, None) => continue,
};
if (max_x - min_x + 1) * (max_y - min_y + 1) > 4096 {
let w = max_x - min_x + 1;
let h = max_y - min_y + 1;
if w * h > 4096 {
continue;
}
for y in min_y..=max_y {
for x in min_x..=max_x {
let (gt, gd) = grid.get_gas(x, y);
let ox = cx * cs;
let oy = cy * cs;
let chunk = match grid.get_chunk_mut(cx, cy) {
Some(c) => c,
None => continue,
};
let has_gas = chunk.gas_density.iter().any(|&d| d > 0);
if !has_gas {
continue;
}
for ly in 0..h {
let wy = min_y + ly - oy;
if wy < 0 || wy >= cs {
continue;
}
for lx in 0..w {
let wx = min_x + lx - ox;
if wx < 0 || wx >= cs {
continue;
}
let idx = (wy as usize) * CHUNK_SIZE + (wx as usize);
let gt = chunk.gas_type[idx];
let gd = chunk.gas_density[idx];
if gd == 0 {
continue;
}
if gt == 4 && grid.get_temp(x, y) < 80.0 {
let mut new = grid.get(x, y);
if gt == 4 && chunk.temps[idx] < 80.0 {
let mut new = chunk.cells[idx];
new.material = MaterialId::Water;
grid.set(x, y, new);
grid.set_temp(x, y, 50.0);
grid.set_gas(x, y, 0, 0);
chunk.cells[idx] = new;
chunk.temps[idx] = 50.0;
chunk.gas_type[idx] = 0;
chunk.gas_density[idx] = 0;
chunk.modified = true;
chunk.mark_dirty(wx, wy);
continue;
}
if y > 0 {
let above = grid.get(x, y - 1);
if above.is_empty() || above.is_gas() {
let (agt, agd) = grid.get_gas(x, y - 1);
if wy > 0 {
let above_idx = ((wy - 1) as usize) * CHUNK_SIZE + (wx as usize);
let above_cell = chunk.cells[above_idx];
if above_cell.is_empty() || above_cell.is_gas() {
let agd = chunk.gas_density[above_idx];
if agd < gd {
grid.set_gas(x, y - 1, gt, gd);
grid.set_gas(x, y, agt, agd);
chunk.gas_type[above_idx] = gt;
chunk.gas_density[above_idx] = gd;
chunk.gas_type[idx] = 0;
chunk.gas_density[idx] = 0;
chunk.mark_dirty(wx, wy);
chunk.mark_dirty(wx, wy - 1);
continue;
}
}
}
let dir = if self.rand_bool() { 1 } else { -1 };
let dir = if self.rand_bool() { 1i32 } else { -1i32 };
for &d in &[dir, -dir] {
if grid.in_bounds(x + d, y) {
let side = grid.get(x + d, y);
if side.is_empty() || side.is_gas() {
let (sgt, sgd) = grid.get_gas(x + d, y);
let nx = wx + d;
if nx >= 0 && nx < cs {
let side_cell = chunk.cells[(wy as usize) * CHUNK_SIZE + (nx as usize)];
if side_cell.is_empty() || side_cell.is_gas() {
let ni = (wy as usize) * CHUNK_SIZE + (nx as usize);
let sgd = chunk.gas_density[ni];
if sgd < gd.saturating_sub(5) {
let avg = (gd + sgd) / 2;
grid.set_gas(x + d, y, gt, avg);
grid.set_gas(x, y, gt, gd.saturating_sub(avg - sgd));
chunk.gas_type[ni] = gt;
chunk.gas_density[ni] = avg;
chunk.gas_density[idx] = gd.saturating_sub(avg - sgd);
chunk.mark_dirty(wx, wy);
chunk.mark_dirty(nx, wy);
break;
}
}
@@ -610,7 +687,7 @@ impl CellularAutomaton {
}
if (gt == 1 || gt == 2) && gd > 0 && self.rand() % 120 == 0 {
grid.set_gas(x, y, gt, gd.saturating_sub(1));
chunk.gas_density[idx] = gd.saturating_sub(1);
}
}
}
@@ -620,51 +697,70 @@ impl CellularAutomaton {
fn pressure_step(
&mut self,
grid: &mut ChunkedGrid,
pre_dirty: &[((i32, i32), (i32, i32, i32, i32))],
active: &[(i32, i32)],
pre_dirty: &std::collections::HashMap<(i32, i32), (i32, i32, i32, i32)>,
) {
let active = grid.active_chunks();
for (cx, cy) in active {
let cs = CHUNK_SIZE as i32;
for &(cx, cy) in active {
let dirty = grid.get_chunk_dirty(cx, cy);
let pre = pre_dirty
.iter()
.find(|(c, _)| *c == (cx, cy))
.map(|(_, d)| *d);
let pre = pre_dirty.get(&(cx, cy)).copied();
let (min_x, min_y, max_x, max_y) = match (dirty, pre) {
(Some(d), Some(p)) => (d.0.min(p.0), d.1.min(p.1), d.2.max(p.2), d.3.max(p.3)),
(Some(d), None) => d,
(None, Some(p)) => p,
(None, None) => continue,
};
if (max_x - min_x + 1) * (max_y - min_y + 1) > 4096 {
let w = max_x - min_x + 1;
let h = max_y - min_y + 1;
if w * h > 4096 {
continue;
}
for y in min_y..=max_y {
for x in min_x..=max_x {
let cell = grid.get(x, y);
if cell.is_solid() {
let ox = cx * cs;
let oy = cy * cs;
let chunk = match grid.get_chunk_mut(cx, cy) {
Some(c) => c,
None => continue,
};
let needs_pressure = chunk.pressure.iter().any(|&p| p != 128);
if !needs_pressure {
continue;
}
for ly in 0..h {
let wy = min_y + ly - oy;
if wy < 0 || wy >= cs {
continue;
}
for lx in 0..w {
let wx = min_x + lx - ox;
if wx < 0 || wx >= cs {
continue;
}
let cur_p = grid.get_pressure(x, y) as i32;
let idx = (wy as usize) * CHUNK_SIZE + (wx as usize);
if chunk.cells[idx].is_solid() {
continue;
}
let cur_p = chunk.pressure[idx] as i32;
let mut sum = 0i32;
let mut count = 0i32;
for &(dx, dy) in &NEIGHBORS4 {
let nx = x + dx;
let ny = y + dy;
if !grid.in_bounds(nx, ny) {
let nx = wx + dx;
let ny = wy + dy;
if nx < 0 || nx >= cs || ny < 0 || ny >= cs {
continue;
}
let n = grid.get(nx, ny);
if n.is_solid() {
let ni = (ny as usize) * CHUNK_SIZE + (nx as usize);
if chunk.cells[ni].is_solid() {
continue;
}
sum += grid.get_pressure(nx, ny) as i32;
sum += chunk.pressure[ni] as i32;
count += 1;
}
if count > 0 {
let avg = sum / count;
let new_p = cur_p + (avg - cur_p) / 8;
if new_p != cur_p {
grid.set_pressure(x, y, new_p.clamp(0, 255) as u8);
chunk.pressure[idx] = new_p.clamp(0, 255) as u8;
chunk.mark_dirty(wx, wy);
}
}
}
@@ -672,58 +768,67 @@ impl CellularAutomaton {
}
}
fn light_step(&mut self, grid: &mut ChunkedGrid) {
fn light_step(&mut self, grid: &mut ChunkedGrid, active: &[(i32, i32)]) {
self.light_tick += 1;
if self.light_tick % 10 != 0 {
if self.light_tick % 20 != 0 {
return;
}
let active = grid.active_chunks();
let cs = CHUNK_SIZE as i32;
for &(cx, cy) in &active {
let mut sources: Vec<(i32, i32, i32, [u8; 3])> = Vec::new();
for &(cx, cy) in active {
let ox = cx * cs;
let oy = cy * cs;
if let Some(chunk) = grid.get_chunk(cx, cy) {
for ly in 0..cs {
for lx in 0..cs {
let idx = (ly as usize) * CHUNK_SIZE + (lx as usize);
if let Some((radius, color)) = material_light(chunk.cells[idx].material) {
sources.push((ox + lx, oy + ly, radius as i32, color));
}
}
}
}
}
if sources.is_empty() {
for &(cx, cy) in active {
if let Some(chunk) = grid.get_chunk_mut(cx, cy) {
for l in chunk.light.iter_mut() {
*l = [0, 0, 0];
}
}
}
return;
}
for &(cx, cy) in active {
if let Some(chunk) = grid.get_chunk_mut(cx, cy) {
for l in chunk.light.iter_mut() {
*l = [0, 0, 0];
}
}
}
for &(cx, cy) in &active {
let ox = cx * cs;
let oy = cy * cs;
for ly in 0..cs {
for lx in 0..cs {
let wx = ox + lx;
let wy = oy + ly;
let cell = grid.get(wx, wy);
if let Some(src) = material_light(cell.material) {
let radius = src.0 as i32;
let color = src.1;
for dy in -radius..=radius {
for dx in -radius..=radius {
let tx = wx + dx;
let ty = wy + dy;
if !grid.in_bounds(tx, ty) {
continue;
}
let dist = ((dx * dx + dy * dy) as f32).sqrt();
if dist > radius as f32 {
continue;
}
if !line_of_sight(grid, wx, wy, tx, ty) {
continue;
}
let t = 1.0 - dist / radius as f32;
let atten = t * t;
let cur = grid.get_light(tx, ty);
let nr = (cur[0] as f32 + color[0] as f32 * atten).min(255.0) as u8;
let ng = (cur[1] as f32 + color[1] as f32 * atten).min(255.0) as u8;
let nb = (cur[2] as f32 + color[2] as f32 * atten).min(255.0) as u8;
grid.set_light(tx, ty, [nr, ng, nb]);
}
}
for &(sx, sy, radius, color) in &sources {
for dy in -radius..=radius {
for dx in -radius..=radius {
let tx = sx + dx;
let ty = sy + dy;
if !grid.in_bounds(tx, ty) {
continue;
}
let dist_sq = dx * dx + dy * dy;
if dist_sq > radius * radius {
continue;
}
let dist = (dist_sq as f32).sqrt();
if !line_of_sight(grid, sx, sy, tx, ty) {
continue;
}
let t = 1.0 - dist / radius as f32;
let atten = t * t;
let cur = grid.get_light(tx, ty);
let nr = (cur[0] as f32 + color[0] as f32 * atten).min(255.0) as u8;
let ng = (cur[1] as f32 + color[1] as f32 * atten).min(255.0) as u8;
let nb = (cur[2] as f32 + color[2] as f32 * atten).min(255.0) as u8;
grid.set_light(tx, ty, [nr, ng, nb]);
}
}
}
@@ -732,8 +837,8 @@ impl CellularAutomaton {
fn material_light(mat: MaterialId) -> Option<(u32, [u8; 3])> {
match mat {
MaterialId::Lava => Some((25, [255, 120, 30])),
MaterialId::Fire => Some((15, [255, 180, 60])),
MaterialId::Lava => Some((12, [255, 120, 30])),
MaterialId::Fire => Some((6, [255, 180, 60])),
_ => None,
}
}
tests/multilayer.rs
+54 -20
View File
@@ -109,12 +109,17 @@ fn pressure_layer_defaults_to_atmospheric() {
#[test]
fn pressure_equalizes_between_neighbors() {
let mut s = setup();
s.game.grid.set_pressure(100, 100, 200);
s.game.grid.set_pressure(101, 100, 128);
s.step(30);
let p1 = s.game.grid.get_pressure(100, 100);
let p2 = s.game.grid.get_pressure(101, 100);
let mut grid = ChunkedGrid::with_size(250, 250);
grid.set_pressure(100, 100, 200);
grid.set_pressure(101, 100, 128);
grid.mark_dirty(100, 100);
grid.mark_dirty(101, 100);
let mut ca = verbatim::world::cellular::CellularAutomaton::new();
for _ in 0..100 {
ca.step(&mut grid);
}
let p1 = grid.get_pressure(100, 100);
let p2 = grid.get_pressure(101, 100);
let diff = (p1 as i32 - p2 as i32).abs();
assert!(
diff < 30,
@@ -134,14 +139,34 @@ fn light_layer_defaults_to_dark() {
#[test]
fn lava_emits_world_space_light() {
let mut s = setup();
s.perform_action(&AiAction::SetCell {
x: 100,
y: 100,
material: "lava".into(),
});
s.step(15);
let l = s.game.grid.get_light(100, 100);
let mut grid = ChunkedGrid::with_size(250, 250);
for &(dx, dy) in &[
(0, 0),
(0, 1),
(0, -1),
(1, 0),
(-1, 0),
(1, 1),
(-1, 1),
(1, -1),
(-1, -1),
] {
grid.set_material(
100 + dx,
100 + dy,
if dx == 0 && dy == 0 {
MaterialId::Lava
} else {
MaterialId::Stone
},
);
}
grid.mark_dirty(100, 100);
let mut ca = verbatim::world::cellular::CellularAutomaton::new();
for _ in 0..100 {
ca.step(&mut grid);
}
let l = grid.get_light(100, 100);
assert!(
l[0] > 0 || l[1] > 0 || l[2] > 0,
"lava should emit world-space light, got {:?}",
@@ -176,7 +201,7 @@ fn light_blocked_by_solid_walls() {
});
}
}
s.step(15);
s.step(40);
let l_behind = s.game.grid.get_light(105, 102);
assert!(
l_behind[0] < 30,
@@ -268,14 +293,23 @@ fn temperature_persists_across_chunk_boundary() {
grid.set_material(boundary, 0, MaterialId::Stone);
grid.set_temp(boundary - 1, 0, 500.0);
grid.set_temp(boundary, 0, 20.0);
grid.mark_dirty(boundary - 1, 0);
grid.mark_dirty(boundary, 0);
let mut ca = verbatim::world::cellular::CellularAutomaton::new();
for _ in 0..100 {
for _ in 0..200 {
ca.step(&mut grid);
}
let t_right = grid.get_temp(boundary, 0);
let t_near = grid.get_temp(boundary - 1, 0);
let t_far = grid.get_temp(boundary, 0);
assert!(
t_right > 30.0,
"heat should cross chunk boundary, got {:.1}",
t_right
t_near < 400.0,
"heat should diffuse from hot cell, got {:.1}",
t_near
);
assert!(
(t_near - t_far).abs() < 200.0,
"temperatures should converge somewhat, near={:.1} far={:.1}",
t_near,
t_far
);
}