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Square wall corners hold grains, liquids and gas (t39)

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Powder, liquid and gas no longer step diagonally between two solid
cells; flyers and diagonal tube intakes obey the same corner. World
generation settles with the rule off, so seeds make the same worlds.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
This commit is contained in:
44r0n7
2026-10-26 18:27:10 -04:00
co-authored by Claude Opus 5.5
parent 0cf615eb3d
commit 9bc5a6c3af
8 changed files with 131 additions and 14 deletions
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src/sim/cells.js
+8 -7
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@@ -67,8 +67,9 @@ let SORTP = 0.06;
const SORTP_FUEL = 0.003;
// Liquids step up to LSTEP cells toward a drop in one tick (fewer the thicker they are), and a top-layer grain looks LFILM
// times as far for one (a two-times range strands the far end of a 200-grain-wide ledge).
// World generation settles with both at 1, so every seed keeps making the same world.
// World generation settles with both at 1 and corner sealing off, so seeds keep the same world.
let LSTEP = 8, LFILM = 4;
let CORNER_SEAL = true;
function powder(i, x, y, m) {
if (y >= H - 1) return;
const b = i + W;
@@ -82,9 +83,9 @@ function powder(i, x, y, m) {
if (rnd() < STICK[m]) {
const d = (RS & 2) ? 1 : -1;
let nx = x + d;
if (nx >= 0 && nx < W && enter(m, PH_POWDER, b + d, d, 1)) { move(i, b + d, x, y, nx, y + 1); return; }
if (nx >= 0 && nx < W && (!CORNER_SEAL || PH[mat[b]] !== PH_SOLID || PH[mat[i + d]] !== PH_SOLID) && enter(m, PH_POWDER, b + d, d, 1)) { move(i, b + d, x, y, nx, y + 1); return; }
nx = x - d;
if (nx >= 0 && nx < W && enter(m, PH_POWDER, b - d, -d, 1)) { move(i, b - d, x, y, nx, y + 1); return; }
if (nx >= 0 && nx < W && (!CORNER_SEAL || PH[mat[b]] !== PH_SOLID || PH[mat[i - d]] !== PH_SOLID) && enter(m, PH_POWDER, b - d, -d, 1)) { move(i, b - d, x, y, nx, y + 1); return; }
}
}
function passable(m, ph, j, dx, dy) {
@@ -106,9 +107,9 @@ function liquid(i, x, y, m) {
if (enter(m, PH_LIQUID, b, 0, 1)) { move(i, b, x, y, x, y + 1); return; }
const d = (RS & 2) ? 1 : -1;
let nx = x + d;
if (nx >= 0 && nx < W && enter(m, PH_LIQUID, b + d, d, 1)) { move(i, b + d, x, y, nx, y + 1); return; }
if (nx >= 0 && nx < W && (!CORNER_SEAL || PH[mat[b]] !== PH_SOLID || PH[mat[i + d]] !== PH_SOLID) && enter(m, PH_LIQUID, b + d, d, 1)) { move(i, b + d, x, y, nx, y + 1); return; }
nx = x - d;
if (nx >= 0 && nx < W && enter(m, PH_LIQUID, b - d, -d, 1)) { move(i, b - d, x, y, nx, y + 1); return; }
if (nx >= 0 && nx < W && (!CORNER_SEAL || PH[mat[b]] !== PH_SOLID || PH[mat[i - d]] !== PH_SOLID) && enter(m, PH_LIQUID, b - d, -d, 1)) { move(i, b - d, x, y, nx, y + 1); return; }
}
if (rnd() > FLUID[m]) return;
const sp = SPREAD[m] * (y === 0 || PH[mat[i - W]] !== PH_LIQUID ? LFILM : 1);
@@ -153,9 +154,9 @@ function gas(i, x, y, m) {
if (enter(m, PH_GAS, u, 0, -1)) { move(i, u, x, y, x, y - 1); return; }
const d = (RS & 2) ? 1 : -1;
let nx = x + d;
if (nx >= 0 && nx < W && enter(m, PH_GAS, u + d, d, -1)) { move(i, u + d, x, y, nx, y - 1); return; }
if (nx >= 0 && nx < W && (!CORNER_SEAL || PH[mat[u]] !== PH_SOLID || PH[mat[i + d]] !== PH_SOLID) && enter(m, PH_GAS, u + d, d, -1)) { move(i, u + d, x, y, nx, y - 1); return; }
nx = x - d;
if (nx >= 0 && nx < W && enter(m, PH_GAS, u - d, -d, -1)) { move(i, u - d, x, y, nx, y - 1); return; }
if (nx >= 0 && nx < W && (!CORNER_SEAL || PH[mat[u]] !== PH_SOLID || PH[mat[i - d]] !== PH_SOLID) && enter(m, PH_GAS, u - d, -d, -1)) { move(i, u - d, x, y, nx, y - 1); return; }
if (rnd() < 0.6) {
nx = x + d;
if (nx >= 0 && nx < W && mat[i + d] === EMPTY && passable(m, PH_GAS, i + d, d, 0)) { move(i, i + d, x, y, nx, y); }